CFLAGS = @CFLAGS@ $(WARNINGS) $(WERROR) $(CMDLINE_CFLAGS)
bin_PROGRAMS = innduct
-innduct_SOURCES = innduct.c __oop-read-copy.c
+innduct_SOURCES = innduct.c conn.c filemon.c infile.c recv.c xmit.c \
+ cli.c defer.c help.c statemc.c __oop-read-copy.c
+
innduct_LDADD = -L/usr/lib/news -lstorage -linn -lm -loop
autoconf:
CFLAGS = @CFLAGS@ $(WARNINGS) $(WERROR) $(CMDLINE_CFLAGS)
bin_PROGRAMS = innduct
-innduct_SOURCES = innduct.c __oop-read-copy.c
+innduct_SOURCES = innduct.c conn.c filemon.c infile.c recv.c xmit.c cli.c defer.c help.c statemc.c __oop-read-copy.c
+
+
innduct_LDADD = -L/usr/lib/news -lstorage -linn -lm -loop
MAINTAINERCLEANFILES = configure config.h.in Makefile.in
CPPFLAGS = @CPPFLAGS@
LDFLAGS = @LDFLAGS@
LIBS = @LIBS@
-innduct_OBJECTS = innduct.o __oop-read-copy.o
+innduct_OBJECTS = innduct.o conn.o filemon.o infile.o recv.o xmit.o \
+cli.o defer.o help.o statemc.o __oop-read-copy.o
innduct_DEPENDENCIES =
innduct_LDFLAGS =
COMPILE = $(CC) $(DEFS) $(INCLUDES) $(AM_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS)
TAR = tar
GZIP_ENV = --best
-DEP_FILES = .deps/__oop-read-copy.P .deps/innduct.P
+DEP_FILES = .deps/__oop-read-copy.P .deps/cli.P .deps/conn.P \
+.deps/defer.P .deps/filemon.P .deps/help.P .deps/infile.P \
+.deps/innduct.P .deps/recv.P .deps/statemc.P .deps/xmit.P
SOURCES = $(innduct_SOURCES)
OBJECTS = $(innduct_OBJECTS)
--- /dev/null
+NEWSFEEDS
+
+Newsfeeds file entries should look like this:
+ host.name.of.site[/exclude,exclude,...]\
+ :pattern,pattern...[/distribution,distribution...]\
+ :Tf,Wnm
+ :
+or
+ sitename[/exclude,exclude,...]\
+ :pattern,pattern...[/distribution,distribution...]\
+ :Tf,Wnm
+ :host.name.of.site
+
+
+FILES
+
+Four files full of
+ token messageid
+or might be blanked out
+ <spc><spc><spc><spc>....
+
+F site.name main feed file
+ opened/created, then written, by innd
+ read by duct
+ unlinked by duct
+ tokens blanked out by duct when processed
+ site.name_lock lock preventing multiple ducts
+ to hold lock must open,F_SETLK[W]
+ and then stat to check that locked file
+ still has name site.name_lock
+ holder of this lock is "duct"
+ (only) lockholder may remove the lockfile
+D site.name_flushing temporary feed file during flush (or crash)
+ hardlink created by duct
+ unlinked by duct
+ site.name_defer 431'd articles, still being written,
+ created, written, used by duct
+
+ site.name_backlog.<date>.<inum>
+ 431'd articles, ready for innxmit or duct
+ created (link/mv) by duct
+ site.name_backlog<anything-else> (where <anything-else> does not
+ contain '#' or '~') eg
+ site.name_backlog.manual
+ anything the sysadmin likes (eg, feed files
+ from old feeds to be merged into this one)
+ created (link/mv) by admin
+ may be symlinks (in which case links
+ may be written through, but only links
+ will be removed.
+
+ It is safe to remove backlog files manually,
+ if it's desired to throw away the backlog.
+
+Backlog files are also processed by innduct. We find the oldest
+backlog file which is at least a certain amount old, and feed it
+back into our processing. When every article in it has been read
+and processed, we unlink it and look for another backlog file.
+
+If we don't have a backlog file that we're reading, we close the
+defer file that we're writing and make it into a backlog file at
+the first convenient opportunity.
--- /dev/null
+
+
+OVERALL STATES, defining interaction with innd:
+
+ START
+ |
+ ,-->--. check F, D
+ | | |
+ | | |
+ | | <----------------<---------------------------------'|
+ | | F exists |
+ | | D ENOENT |
+ | | duct opens F |
+ | V |
+ | Normal |
+ | F: innd writing, duct reading |
+ | D: ENOENT |
+ | | |
+ | | duct decides time to flush |
+ | | duct makes hardlink |
+ | | |
+ | V <------------------------'|
+ | Hardlinked F==D |
+ | F == D: innd writing, duct reading both exist |
+ ^ | |
+ | | duct unlinks F |
+ | | <-----------<-------------<--'|
+ | | open D F ENOENT |
+ | | if exists |
+ | | |
+ | V <---------------------. |
+ | Moved | |
+ | F: ENOENT | |
+ | D: innd writing, duct reading; or ENOENT | |
+ | | | |
+ | | duct requests flush of feed | |
+ | | (others can too, harmlessly) | |
+ | V | |
+ | Flushing | |
+ | F: ENOENT | |
+ | D: innd flushing, duct; or ENOENT | |
+ | | | |
+ | | inndcomm flush fails | |
+ | |`-------------------------->------------------' |
+ | | |
+ | | inndcomm reports no such site |
+ | |`---------------------------------------------------- | -.
+ | | | |
+ | | innd finishes writing D, creates F | |
+ | | inndcomm reports flush successful | |
+ | | | |
+ | V | |
+ | Separated <----------------' |
+ | F: innd writing F!=D /
+ | D: duct reading; or ENOENT both exist /
+ | | /
+ | | duct gets to the end of D /
+ | | duct opens F too /
+ | V /
+ | Finishing /
+ | F: innd writing, duct reading |
+ | D: duct finishing V
+ | | Dropping
+ | | duct finishes processing D F: ENOENT
+ | V duct unlinks D D: duct reading
+ | | |
+ `--<--' | duct finishes
+ | processing D
+ | duct unlinks D
+ | duct exits
+ V
+ Dropped
+ F: ENOENT
+ D: ENOENT
+ duct not running
+
+ "duct reading" means innduct is reading the file but also
+ overwriting processed tokens.
+
+\f
+
+We implement this as follows:
+
+ .=======.
+ ||START||
+ `======='
+ |
+ | open F
+ |
+ | F ENOENT
+ |`---------------------------------------------------.
+ F OPEN OK | |
+ |`---------------- - - - |
+ D ENOENT | D EXISTS see OVERALL STATES diagram |
+ | for full startup logic |
+ ,--------->| |
+ | V |
+ | ============ try to |
+ | NORMAL open D |
+ | [Normal] |
+ | main F tail |
+ | ============ V
+ | | |
+ | | F IS SO BIG WE SHOULD FLUSH, OR TIMEOUT |
+ ^ | hardlink F to D |
+ | [Hardlinked] |
+ | | unlink F |
+ | | our handle onto F is now onto D |
+ | [Moved] |
+ | | |
+ | |<-------------------<---------------------<---------+
+ | | |
+ | | spawn inndcomm flush |
+ | V |
+ | ================== |
+ | FLUSHING[-ABSENT] |
+ | [Flushing] |
+ | main D tail/none |
+ | ================== |
+ | | |
+ | | INNDCOMM FLUSH FAILS ^
+ | |`----------------------->----------. |
+ | | | |
+ | | NO SUCH SITE V |
+ ^ |`--------------->----. ==================== |
+ | | \ FLUSHFAILED[-ABSENT] |
+ | | \ [Moved] |
+ | | FLUSH OK \ main D tail/none |
+ | | open F \ ==================== |
+ | | \ | |
+ | | \ | TIME TO RETRY |
+ | |`------->----. ,---<---'\ `----------------'
+ | | D NONE | | D NONE `----.
+ | V | | V
+ | ============= V V ============
+ | SEPARATED-1 | | DROPPING-1
+ | flsh->rd!=0 | | flsh->rd!=0
+ | [Separated] | | [Dropping]
+ | main F idle | | main none
+ | flsh D tail | | flsh D tail
+ | ============= | | ============
+ | | | | install |
+ ^ | EOF ON D | | defer | EOF ON D
+ | V | | V
+ | =============== | | ===============
+ | SEPARATED-2 | | DROPPING-2
+ | flsh->rd==0 | V flsh->rd==0
+ | [Finishing] | | [Dropping]
+ | main F tail | `. main none
+ | flsh D closed | `. flsh D closed
+ | =============== V `. ===============
+ | | `. |
+ | | ALL D PROCESSED `. | ALL D PROCESSED
+ | V install defer as backlog `. | install defer
+ ^ | close D `. | close D
+ | | unlink D `. | unlink D
+ | | | |
+ | | V V
+ `----------' ==============
+ DROPPED
+ [Dropped]
+ main none
+ flsh none
+ some backlog
+ ==============
+ |
+ | ALL BACKLOG DONE
+ |
+ | unlink lock
+ | exit
+ V
+ ==========
+ (ESRCH)
+ [Droppped]
+ ==========
+
+
+rune for printing diagrams:
+ a2ps -R -B -ops README.states
--- /dev/null
+/*========== command and control (CLI) connections ==========*/
+
+static int cli_master;
+
+typedef struct CliConn CliConn;
+struct CliConn {
+ void (*destroy)(CliConn*);
+ int fd;
+ oop_read *rd;
+ FILE *out;
+ union {
+ struct sockaddr sa;
+ struct sockaddr_un un;
+ } sa;
+ socklen_t salen;
+};
+
+static const oop_rd_style cli_rd_style= {
+ OOP_RD_DELIM_STRIP, '\n',
+ OOP_RD_NUL_FORBID,
+ OOP_RD_SHORTREC_FORBID
+};
+
+static void cli_destroy(CliConn *cc) {
+ cc->destroy(cc);
+}
+
+static void cli_checkouterr(CliConn *cc /* may destroy*/) {
+ if (ferror(cc->out) | fflush(cc->out)) {
+ info("CTRL%d write error %s", cc->fd, strerror(errno));
+ cli_destroy(cc);
+ }
+}
+
+static void cli_prompt(CliConn *cc /* may destroy*/) {
+ fprintf(cc->out, "%s| ", sitename);
+ cli_checkouterr(cc);
+}
+
+struct CliCommand {
+ const char *cmd;
+ void (*f)(CliConn *cc, const CliCommand *ccmd,
+ const char *arg, size_t argsz);
+ void *xdata;
+ int xval;
+};
+
+static const CliCommand cli_commands[];
+
+#define CCMD(wh) \
+ static void ccmd_##wh(CliConn *cc, const CliCommand *c, \
+ const char *arg, size_t argsz)
+
+CCMD(help) {
+ fputs("commands:\n", cc->out);
+ const CliCommand *ccmd;
+ for (ccmd=cli_commands; ccmd->cmd; ccmd++)
+ fprintf(cc->out, " %s\n", ccmd->cmd);
+ fputs("NB: permissible arguments are not shown above."
+ " Not all commands listed are safe. See innduct(8).\n", cc->out);
+}
+
+CCMD(flush) {
+ int ok= trigger_flush_ok("manual request");
+ if (!ok) fprintf(cc->out,"already flushing (state is %s)\n", sms_names[sms]);
+}
+
+CCMD(stop) {
+ preterminate();
+ notice("terminating (CTRL%d)",cc->fd);
+ raise_default(SIGTERM);
+ abort();
+}
+
+CCMD(dump);
+
+/* messing with our head: */
+CCMD(period) { period(); }
+CCMD(setintarg) { *(int*)c->xdata= atoi(arg); }
+CCMD(setint) { *(int*)c->xdata= c->xval; }
+CCMD(setint_period) { *(int*)c->xdata= c->xval; period(); }
+
+static const CliCommand cli_commands[]= {
+ { "h", ccmd_help },
+ { "flush", ccmd_flush },
+ { "stop", ccmd_stop },
+ { "dump q", ccmd_dump, 0,0 },
+ { "dump a", ccmd_dump, 0,1 },
+
+ { "p", ccmd_period },
+
+#define POKES(cmd,func) \
+ { cmd "flush", func, &until_flush, 1 }, \
+ { cmd "conn", func, &until_connect, 0 }, \
+ { cmd "blscan", func, &until_backlog_nextscan, 0 },
+POKES("next ", ccmd_setint)
+POKES("prod ", ccmd_setint_period)
+
+ { "pretend flush", ccmd_setintarg, &simulate_flush },
+ { "wedge blscan", ccmd_setint, &until_backlog_nextscan, -1 },
+ { 0 }
+};
+
+static void *cli_rd_ok(oop_source *lp, oop_read *oread, oop_rd_event ev,
+ const char *errmsg, int errnoval,
+ const char *data, size_t recszu, void *cc_v) {
+ CliConn *cc= cc_v;
+
+ if (!data) {
+ info("CTRL%d closed", cc->fd);
+ cc->destroy(cc);
+ return OOP_CONTINUE;
+ }
+
+ if (recszu == 0) goto prompt;
+ assert(recszu <= INT_MAX);
+ int recsz= recszu;
+
+ const CliCommand *ccmd;
+ for (ccmd=cli_commands; ccmd->cmd; ccmd++) {
+ int l= strlen(ccmd->cmd);
+ if (recsz < l) continue;
+ if (recsz > l && data[l] != ' ') continue;
+ if (memcmp(data, ccmd->cmd, l)) continue;
+
+ int argl= (int)recsz - (l+1);
+ ccmd->f(cc, ccmd, argl>=0 ? data+l+1 : 0, argl);
+ goto prompt;
+ }
+
+ fputs("unknown command; h for help\n", cc->out);
+
+ prompt:
+ cli_prompt(cc);
+ return OOP_CONTINUE;
+}
+
+static void *cli_rd_err(oop_source *lp, oop_read *oread, oop_rd_event ev,
+ const char *errmsg, int errnoval,
+ const char *data, size_t recsz, void *cc_v) {
+ CliConn *cc= cc_v;
+
+ info("CTRL%d read error %s", cc->fd, errmsg);
+ cc->destroy(cc);
+ return OOP_CONTINUE;
+}
+
+static int cli_conn_startup(CliConn *cc /* may destroy*/,
+ const char *how) {
+ cc->rd= oop_rd_new_fd(loop, cc->fd, 0,0);
+ if (!cc->rd) { warn("oop_rd_new_fd cli failed"); return -1; }
+
+ int er= oop_rd_read(cc->rd, &cli_rd_style, MAX_CLI_COMMAND,
+ cli_rd_ok, cc,
+ cli_rd_err, cc);
+ if (er) { errno= er; syswarn("oop_rd_read cli failed"); return -1; }
+
+ info("CTRL%d %s ready", cc->fd, how);
+ cli_prompt(cc);
+ return 0;
+}
+
+static void cli_stdio_destroy(CliConn *cc) {
+ if (cc->rd) {
+ oop_rd_cancel(cc->rd);
+ errno= oop_rd_delete_tidy(cc->rd);
+ if (errno) syswarn("oop_rd_delete tidy failed (no-nonblock stdin?)");
+ }
+ free(cc);
+}
+
+static void cli_stdio(void) {
+ NEW_DECL(CliConn *,cc);
+ cc->destroy= cli_stdio_destroy;
+
+ cc->fd= 0;
+ cc->out= stdout;
+ int r= cli_conn_startup(cc,"stdio");
+ if (r) cc->destroy(cc);
+}
+
+static void cli_accepted_destroy(CliConn *cc) {
+ if (cc->rd) {
+ oop_rd_cancel(cc->rd);
+ oop_rd_delete_kill(cc->rd);
+ }
+ if (cc->out) { fclose(cc->out); cc->fd=0; }
+ close_perhaps(&cc->fd);
+ free(cc);
+}
+
+static void *cli_master_readable(oop_source *lp, int master,
+ oop_event ev, void *u) {
+ NEW_DECL(CliConn *,cc);
+ cc->destroy= cli_accepted_destroy;
+
+ cc->salen= sizeof(cc->sa);
+ cc->fd= accept(master, &cc->sa.sa, &cc->salen);
+ if (cc->fd<0) { syswarn("error accepting cli connection"); goto x; }
+
+ cc->out= fdopen(cc->fd, "w");
+ if (!cc->out) { syswarn("error fdopening accepted cli connection"); goto x; }
+
+ int r= cli_conn_startup(cc, "accepted");
+ if (r) goto x;
+
+ return OOP_CONTINUE;
+
+ x:
+ cc->destroy(cc);
+ return OOP_CONTINUE;
+}
+
+#define NOCLI(...) do{ \
+ syswarn("no cli listener, because failed to " __VA_ARGS__); \
+ goto nocli; \
+ }while(0)
+
+static void cli_init(void) {
+ union {
+ struct sockaddr sa;
+ struct sockaddr_un un;
+ } sa;
+
+ memset(&sa,0,sizeof(sa));
+ int maxlen= sizeof(sa.un.sun_path);
+
+ if (!path_cli) {
+ info("control command line disabled");
+ return;
+ }
+
+ int pathlen= strlen(path_cli);
+ if (pathlen > maxlen) {
+ warn("no cli listener, because cli socket path %s too long (%d>%d)",
+ path_cli, pathlen, maxlen);
+ return;
+ }
+
+ if (path_cli_dir) {
+ int r= mkdir(path_cli_dir, 0700);
+ if (r && errno!=EEXIST)
+ NOCLI("create cli socket directory %s", path_cli_dir);
+ }
+
+ int r= unlink(path_cli);
+ if (r && errno!=ENOENT)
+ NOCLI("remove old cli socket %s", path_cli);
+
+ cli_master= socket(PF_UNIX, SOCK_STREAM, 0);
+ if (cli_master<0) NOCLI("create new cli master socket");
+
+ int sl= pathlen + offsetof(struct sockaddr_un, sun_path);
+ sa.un.sun_family= AF_UNIX;
+ memcpy(sa.un.sun_path, path_cli, pathlen);
+
+ r= bind(cli_master, &sa.sa, sl);
+ if (r) NOCLI("bind to cli socket path %s", sa.un.sun_path);
+
+ r= listen(cli_master, 5);
+ if (r) NOCLI("listen to cli master socket");
+
+ xsetnonblock(cli_master, 1);
+
+ loop->on_fd(loop, cli_master, OOP_READ, cli_master_readable, 0);
+ info("cli ready, listening on %s", path_cli);
+
+ return;
+
+ nocli:
+ xclose_perhaps(&cli_master, "cli master",0);
+ return;
+}
+
+/*========== dumping state ==========*/
+
+static void dump_article_list(FILE *f, const CliCommand *c,
+ const ArticleList *al) {
+ fprintf(f, " count=%d\n", al->count);
+ if (!c->xval) return;
+
+ int i; Article *art;
+ for (i=0, art=LIST_HEAD(*al); art; i++, art=LIST_NEXT(art)) {
+ fprintf(f," #%05d %-11s", i, artstate_names[art->state]);
+ DUMPV("%p", art->,ipf);
+ DUMPV("%d", art->,missing);
+ DUMPV("%lu", (unsigned long)art->,offset);
+ DUMPV("%d", art->,blanklen);
+ DUMPV("%d", art->,midlen);
+ fprintf(f, " %s %s\n", TokenToText(art->token), art->messageid);
+ }
+}
+
+static void dump_input_file(FILE *f, const CliCommand *c,
+ InputFile *ipf, const char *wh) {
+ char *dipf= dbg_report_ipf(ipf);
+ fprintf(f,"input %s %s", wh, dipf);
+ free(dipf);
+
+ if (ipf) {
+ DUMPV("%d", ipf->,readcount_ok);
+ DUMPV("%d", ipf->,readcount_blank);
+ DUMPV("%d", ipf->,readcount_err);
+ DUMPV("%d", ipf->,count_nooffer_missing);
+ }
+ fprintf(f,"\n");
+ if (ipf) {
+ ArtState state; const char *const *statename;
+ for (state=0, statename=artstate_names; *statename; state++,statename++) {
+#define RC_DUMP_FMT(x) " " #x "=%d"
+#define RC_DUMP_VAL(x) ,ipf->counts[state][RC_##x]
+ fprintf(f,"input %s counts %-11s"
+ RESULT_COUNTS(RC_DUMP_FMT,RC_DUMP_FMT) "\n",
+ wh, *statename
+ RESULT_COUNTS(RC_DUMP_VAL,RC_DUMP_VAL));
+ }
+ fprintf(f,"input %s queue", wh);
+ dump_article_list(f,c,&ipf->queue);
+ }
+}
+
+CCMD(dump) {
+ int i;
+ fprintf(cc->out, "dumping state to %s\n", path_dump);
+ FILE *f= fopen(path_dump, "w");
+ if (!f) { fprintf(cc->out, "failed: open: %s\n", strerror(errno)); return; }
+
+ fprintf(f,"general");
+ DUMPV("%s", sms_names,[sms]);
+ DUMPV("%d", ,until_flush);
+ DUMPV("%ld", (long),self_pid);
+ DUMPV("%p", , defer);
+ DUMPV("%d", , until_connect);
+ DUMPV("%d", , until_backlog_nextscan);
+ DUMPV("%d", , simulate_flush);
+ fprintf(f,"\nnocheck");
+ DUMPV("%#.10f", , accept_proportion);
+ DUMPV("%d", , nocheck);
+ DUMPV("%d", , nocheck_reported);
+ fprintf(f,"\n");
+
+ fprintf(f,"special");
+ DUMPV("%ld", (long),connecting_child);
+ DUMPV("%d", , connecting_fdpass_sock);
+ DUMPV("%d", , cli_master);
+ fprintf(f,"\n");
+
+ fprintf(f,"lowvol");
+ DUMPV("%d", , lowvol_circptr);
+ DUMPV("%d", , lowvol_total);
+ fprintf(f,":");
+ for (i=0; i<lowvol_periods; i++) {
+ fprintf(f," ");
+ if (i==lowvol_circptr) fprintf(f,"*");
+ fprintf(f,"%d",lowvol_perperiod[i]);
+ }
+ fprintf(f,"\n");
+
+ fprintf(f,"filemon ");
+ filemon_method_dump_info(f);
+
+ dump_input_file(f,c, main_input_file, "main" );
+ dump_input_file(f,c, flushing_input_file, "flushing");
+ dump_input_file(f,c, backlog_input_file, "backlog" );
+
+ fprintf(f,"conns count=%d\n", conns.count);
+
+ Conn *conn;
+ FOR_CONN(conn) {
+
+ fprintf(f,"C%d",conn->fd);
+ DUMPV("%p",conn->,rd); DUMPV("%d",conn->,max_queue);
+ DUMPV("%d",conn->,stream); DUMPV("\"%s\"",conn->,quitting);
+ DUMPV("%d",conn->,since_activity);
+ fprintf(f,"\n");
+
+ fprintf(f,"C%d waiting", conn->fd); dump_article_list(f,c,&conn->waiting);
+ fprintf(f,"C%d priority",conn->fd); dump_article_list(f,c,&conn->priority);
+ fprintf(f,"C%d sent", conn->fd); dump_article_list(f,c,&conn->sent);
+
+ fprintf(f,"C%d xmit xmitu=%d\n", conn->fd, conn->xmitu);
+ for (i=0; i<conn->xmitu; i++) {
+ const struct iovec *iv= &conn->xmit[i];
+ const XmitDetails *xd= &conn->xmitd[i];
+ char *dinfo;
+ switch (xd->kind) {
+ case xk_Const: dinfo= xasprintf("Const"); break;
+ case xk_Artdata: dinfo= xasprintf("A%p", xd->info.sm_art); break;
+ default:
+ abort();
+ }
+ fprintf(f," #%03d %-11s l=%d %s\n", i, dinfo, iv->iov_len,
+ sanitise(iv->iov_base, iv->iov_len));
+ free(dinfo);
+ }
+ }
+
+ fprintf(f,"paths");
+ DUMPV("%s", , feedfile);
+ DUMPV("%s", , path_cli);
+ DUMPV("%s", , path_lock);
+ DUMPV("%s", , path_flushing);
+ DUMPV("%s", , path_defer);
+ DUMPV("%s", , path_dump);
+ DUMPV("%s", , globpat_backlog);
+ fprintf(f,"\n");
+
+ if (!!ferror(f) + !!fclose(f)) {
+ fprintf(cc->out, "failed: write: %s\n", strerror(errno));
+ return;
+ }
+}
--- /dev/null
+/*========== management of connections ==========*/
+
+static void reconnect_blocking_event(void) {
+ until_connect= reconnect_delay_periods;
+}
+
+void conn_closefd(Conn *conn, const char *msgprefix) {
+ int r= close_perhaps(&conn->fd);
+ if (r) info("C%d %serror closing socket: %s",
+ conn->fd, msgprefix, strerror(errno));
+}
+
+static int conn_busy(Conn *conn) {
+ return
+ conn->waiting.count ||
+ conn->priority.count ||
+ conn->sent.count ||
+ conn->xmitu;
+}
+
+static void conn_dispose(Conn *conn) {
+ if (!conn) return;
+ if (conn->rd) {
+ oop_rd_cancel(conn->rd);
+ oop_rd_delete_kill(conn->rd);
+ conn->rd= 0;
+ }
+ if (conn->fd) {
+ loop->cancel_fd(loop, conn->fd, OOP_WRITE);
+ loop->cancel_fd(loop, conn->fd, OOP_EXCEPTION);
+ }
+ conn_closefd(conn,"");
+ free(conn);
+}
+
+static void *conn_exception(oop_source *lp, int fd,
+ oop_event ev, void *conn_v) {
+ Conn *conn= conn_v;
+ unsigned char ch;
+ assert(fd == conn->fd);
+ assert(ev == OOP_EXCEPTION);
+ int r= read(conn->fd, &ch, 1);
+ if (r<0) connfail(conn,"read failed: %s",strerror(errno));
+ else connfail(conn,"exceptional condition on socket (peer sent urgent"
+ " data? read(,&ch,1)=%d,ch='\\x%02x')",r,ch);
+ return OOP_CONTINUE;
+}
+
+static void vconnfail(Conn *conn, const char *fmt, va_list al) {
+ int requeue[art_MaxState];
+ memset(requeue,0,sizeof(requeue));
+
+ Article *art;
+
+ while ((art= LIST_REMHEAD(conn->priority)))
+ LIST_ADDTAIL(art->ipf->queue, art);
+
+ while ((art= LIST_REMHEAD(conn->waiting)))
+ LIST_ADDTAIL(art->ipf->queue, art);
+
+ while ((art= LIST_REMHEAD(conn->sent))) {
+ requeue[art->state]++;
+ if (art->state==art_Unsolicited) art->state= art_Unchecked;
+ LIST_ADDTAIL(art->ipf->queue,art);
+ check_reading_pause_resume(art->ipf);
+ }
+
+ int i;
+ XmitDetails *d;
+ for (i=0, d=conn->xmitd; i<conn->xmitu; i++, d++)
+ xmit_free(d);
+
+ LIST_REMOVE(conns,conn);
+
+ char *m= xvasprintf(fmt,al);
+ warn("C%d (now %d) connection failed requeueing " RCI_TRIPLE_FMT_BASE ": %s",
+ conn->fd, conns.count, RCI_TRIPLE_VALS_BASE(requeue, /*nothing*/), m);
+ free(m);
+
+ reconnect_blocking_event();
+ conn_dispose(conn);
+ check_assign_articles();
+}
+
+static void connfail(Conn *conn, const char *fmt, ...) {
+ va_list al;
+ va_start(al,fmt);
+ vconnfail(conn,fmt,al);
+ va_end(al);
+}
+
+static void conn_idle_close(Conn *conn, const char *why) {
+ static const char quitcmd[]= "QUIT\r\n";
+ int todo= sizeof(quitcmd)-1;
+ const char *p= quitcmd;
+ for (;;) {
+ int r= write(conn->fd, p, todo);
+ if (r<0) {
+ if (isewouldblock(errno))
+ connfail(conn, "blocked writing QUIT to idle connection");
+ else
+ connfail(conn, "failed to write QUIT to idle connection: %s",
+ strerror(errno));
+ break;
+ }
+ assert(r<=todo);
+ todo -= r;
+ if (!todo) {
+ conn->quitting= why;
+ conn->since_activity= 0;
+ dbg("C%d is idle (%s), quitting", conn->fd, why);
+ break;
+ }
+ }
+}
+
+/*
+ * For our last connection, we also shut it down if we have had
+ * less than K in the last L
+ */
+static void check_idle_conns(void) {
+ Conn *conn;
+
+ int volthisperiod= lowvol_perperiod[lowvol_circptr];
+ lowvol_circptr++;
+ lowvol_circptr %= lowvol_periods;
+ lowvol_total += volthisperiod;
+ lowvol_total -= lowvol_perperiod[lowvol_circptr];
+ lowvol_perperiod[lowvol_circptr]= 0;
+
+ FOR_CONN(conn)
+ conn->since_activity++;
+
+ search_again:
+ FOR_CONN(conn) {
+ if (conn->since_activity <= need_activity_periods) continue;
+
+ /* We need to shut this down */
+ if (conn->quitting)
+ connfail(conn,"timed out waiting for response to QUIT (%s)",
+ conn->quitting);
+ else if (conn->sent.count)
+ connfail(conn,"timed out waiting for responses");
+ else if (conn->waiting.count || conn->priority.count)
+ connfail(conn,"BUG IN INNDUCT conn has queue but nothing sent");
+ else if (conn->xmitu)
+ connfail(conn,"peer has been sending responses"
+ " before receiving our commands!");
+ else
+ conn_idle_close(conn, "no activity");
+
+ goto search_again;
+ }
+
+ conn= LIST_HEAD(conns);
+ if (!volthisperiod &&
+ conns.count==1 &&
+ lowvol_total < lowvol_thresh &&
+ !conn_busy(conn))
+ conn_idle_close(conn, "low volume");
+}
+
+/*---------- making new connections ----------*/
+
+static pid_t connecting_child;
+int connecting_fdpass_sock;
+
+static void connect_attempt_discard(void) {
+ if (connecting_child) {
+ int status= xwaitpid(&connecting_child, "connect");
+ if (!(WIFEXITED(status) ||
+ (WIFSIGNALED(status) && WTERMSIG(status) == SIGKILL)))
+ report_child_status("connect", status);
+ }
+ if (connecting_fdpass_sock) {
+ cancel_fd_read_except(connecting_fdpass_sock);
+ xclose_perhaps(&connecting_fdpass_sock, "connecting fdpass socket",0);
+ }
+}
+
+#define PREP_DECL_MSG_CMSG(msg) \
+ char msgbyte= 0; \
+ struct iovec msgiov; \
+ msgiov.iov_base= &msgbyte; \
+ msgiov.iov_len= 1; \
+ struct msghdr msg; \
+ memset(&msg,0,sizeof(msg)); \
+ char msg##cbuf[CMSG_SPACE(sizeof(int))]; \
+ msg.msg_iov= &msgiov; \
+ msg.msg_iovlen= 1; \
+ msg.msg_control= msg##cbuf; \
+ msg.msg_controllen= sizeof(msg##cbuf);
+
+static void *connchild_event(oop_source *lp, int fd, oop_event e, void *u) {
+ Conn *conn= 0;
+
+ assert(fd == connecting_fdpass_sock);
+
+ PREP_DECL_MSG_CMSG(msg);
+
+ ssize_t rs= recvmsg(fd, &msg, 0);
+ if (rs<0) {
+ if (isewouldblock(errno)) return OOP_CONTINUE;
+ syswarn("failed to read socket from connecting child");
+ goto x;
+ }
+
+ NEW(conn);
+ LIST_INIT(conn->waiting);
+ LIST_INIT(conn->priority);
+ LIST_INIT(conn->sent);
+
+ struct cmsghdr *h= 0;
+ if (rs >= 0) h= CMSG_FIRSTHDR(&msg);
+ if (!h) {
+ int status= xwaitpid(&connecting_child, "connect child (broken)");
+
+ if (WIFEXITED(status)) {
+ if (WEXITSTATUS(status) != 0 &&
+ WEXITSTATUS(status) != CONNCHILD_ESTATUS_STREAM &&
+ WEXITSTATUS(status) != CONNCHILD_ESTATUS_NOSTREAM)
+ /* child already reported the problem */;
+ else {
+ if (e == OOP_EXCEPTION)
+ warn("connect: connection child exited code %d but"
+ " unexpected exception on fdpass socket",
+ WEXITSTATUS(status));
+ else
+ warn("connect: connection child exited code %d but"
+ " no cmsg (rs=%d)",
+ WEXITSTATUS(status), (int)rs);
+ }
+ } else if (WIFSIGNALED(status) && WTERMSIG(status) == SIGALRM) {
+ warn("connect: connection attempt timed out");
+ } else {
+ report_child_status("connect", status);
+ }
+ goto x;
+ }
+
+#define CHK(field, val) \
+ if (h->cmsg_##field != val) { \
+ crash("connect: child sent cmsg with cmsg_" #field "=%d, expected %d", \
+ h->cmsg_##field, val); \
+ goto x; \
+ }
+ CHK(level, SOL_SOCKET);
+ CHK(type, SCM_RIGHTS);
+ CHK(len, CMSG_LEN(sizeof(conn->fd)));
+#undef CHK
+
+ if (CMSG_NXTHDR(&msg,h)) crash("connect: child sent many cmsgs");
+
+ memcpy(&conn->fd, CMSG_DATA(h), sizeof(conn->fd));
+
+ int status;
+ pid_t got= waitpid(connecting_child, &status, 0);
+ if (got==-1) syscrash("connect: real wait for child");
+ assert(got == connecting_child);
+ connecting_child= 0;
+
+ if (!WIFEXITED(status)) { report_child_status("connect",status); goto x; }
+ int es= WEXITSTATUS(status);
+ switch (es) {
+ case CONNCHILD_ESTATUS_STREAM: conn->stream= 1; break;
+ case CONNCHILD_ESTATUS_NOSTREAM: conn->stream= 0; break;
+ default:
+ die("connect: child gave unexpected exit status %d", es);
+ }
+
+ /* Phew! */
+ conn->max_queue= conn->stream ? max_queue_per_conn : 1;
+
+ loop->on_fd(loop, conn->fd, OOP_EXCEPTION, conn_exception, conn);
+ conn->rd= oop_rd_new_fd(loop,conn->fd, 0, 0); /* sets nonblocking, too */
+ if (!conn->fd) crash("oop_rd_new_fd conn failed (fd=%d)",conn->fd);
+ int r= oop_rd_read(conn->rd, &peer_rd_style, NNTP_STRLEN,
+ &peer_rd_ok, conn,
+ &peer_rd_err, conn);
+ if (r) syscrash("oop_rd_read for peer (fd=%d)",conn->fd);
+
+ LIST_ADDHEAD(conns, conn);
+ notice("C%d (now %d) connected %s",
+ conn->fd, conns.count, conn->stream ? "streaming" : "plain");
+
+ connect_attempt_discard();
+ check_assign_articles();
+ return OOP_CONTINUE;
+
+ x:
+ conn_dispose(conn);
+ connect_attempt_discard();
+ reconnect_blocking_event();
+ return OOP_CONTINUE;
+}
+
+static int allow_connect_start(void) {
+ return conns.count < max_connections
+ && !connecting_child
+ && !until_connect;
+}
+
+static void connect_start(void) {
+ assert(!connecting_child);
+ assert(!connecting_fdpass_sock);
+
+ info("starting connection attempt");
+ int ok_until_connect= until_connect;
+ reconnect_blocking_event();
+
+ int socks[2];
+ int r= socketpair(AF_UNIX, SOCK_STREAM, 0, socks);
+ if (r) { syswarn("connect: cannot create socketpair for child"); return; }
+
+ connecting_child= xfork("connection");
+
+ if (!connecting_child) {
+ FILE *cn_from, *cn_to;
+ char buf[NNTP_STRLEN+100];
+ int exitstatus= CONNCHILD_ESTATUS_NOSTREAM;
+
+ xclose(socks[0], "(in child) parent's connection fdpass socket",0);
+
+ alarm(connection_setup_timeout);
+ if (NNTPconnect((char*)remote_host, port, &cn_from, &cn_to, buf) < 0) {
+ int l= strlen(buf);
+ int stripped=0;
+ while (l>0) {
+ unsigned char c= buf[l-1];
+ if (!isspace(c)) break;
+ if (c=='\n' || c=='\r') stripped=1;
+ --l;
+ }
+ if (!buf[0]) {
+ sysdie("connect: connection attempt failed");
+ } else {
+ buf[l]= 0;
+ die("connect: %s: %s", stripped ? "rejected" : "failed",
+ sanitise(buf,-1));
+ }
+ }
+ if (NNTPsendpassword((char*)remote_host, cn_from, cn_to) < 0)
+ sysdie("connect: authentication failed");
+ if (try_stream) {
+ if (fputs("MODE STREAM\r\n", cn_to)==EOF ||
+ fflush(cn_to))
+ sysdie("connect: could not send MODE STREAM");
+ buf[sizeof(buf)-1]= 0;
+ if (!fgets(buf, sizeof(buf)-1, cn_from)) {
+ if (ferror(cn_from))
+ sysdie("connect: could not read response to MODE STREAM");
+ else
+ die("connect: connection close in response to MODE STREAM");
+ }
+ int l= strlen(buf);
+ assert(l>=1);
+ if (buf[l-1]!='\n')
+ die("connect: response to MODE STREAM is too long: %.100s...",
+ sanitise(buf,-1));
+ l--; if (l>0 && buf[l-1]=='\r') l--;
+ buf[l]= 0;
+ char *ep;
+ int rcode= strtoul(buf,&ep,10);
+ if (ep != &buf[3])
+ die("connect: bad response to MODE STREAM: %.50s", sanitise(buf,-1));
+
+ switch (rcode) {
+ case 203:
+ exitstatus= CONNCHILD_ESTATUS_STREAM;
+ break;
+ case 480:
+ case 500:
+ break;
+ default:
+ warn("connect: unexpected response to MODE STREAM: %.50s",
+ sanitise(buf,-1));
+ exitstatus= 2;
+ break;
+ }
+ }
+ int fd= fileno(cn_from);
+
+ PREP_DECL_MSG_CMSG(msg);
+ struct cmsghdr *cmsg= CMSG_FIRSTHDR(&msg);
+ cmsg->cmsg_level= SOL_SOCKET;
+ cmsg->cmsg_type= SCM_RIGHTS;
+ cmsg->cmsg_len= CMSG_LEN(sizeof(fd));
+ memcpy(CMSG_DATA(cmsg), &fd, sizeof(fd));
+
+ msg.msg_controllen= cmsg->cmsg_len;
+ r= sendmsg(socks[1], &msg, 0);
+ if (r<0) syscrash("sendmsg failed for new connection");
+ if (r!=1) crash("sendmsg for new connection gave wrong result %d",r);
+
+ _exit(exitstatus);
+ }
+
+ xclose(socks[1], "connecting fdpass child's socket",0);
+ connecting_fdpass_sock= socks[0];
+ xsetnonblock(connecting_fdpass_sock, 1);
+ on_fd_read_except(connecting_fdpass_sock, connchild_event);
+
+ if (!conns.count)
+ until_connect= ok_until_connect;
+}
+
--- /dev/null
+
+
+
+/*----- function predeclarations -----*/
+
+void conn_maybe_write(Conn *conn);
+void conn_make_some_xmits(Conn *conn);
+void *conn_write_some_xmits(Conn *conn);
+
+void xmit_free(XmitDetails *d);
+
+#define SMS(newstate, periods, why) \
+ (statemc_setstate(sm_##newstate,(periods),#newstate,(why)))
+void statemc_setstate(StateMachineState newsms, int periods,
+ const char *forlog, const char *why);
+
+void statemc_start_flush(const char *why); /* Normal => Flushing */
+void spawn_inndcomm_flush(const char *why); /* Moved => Flushing */
+int trigger_flush_ok(const char *why /* 0 means timeout */);
+ /* => Flushing,FLUSHING, ret 1; or ret 0 */
+
+void article_done(Article *art, int whichcount);
+
+void check_assign_articles(void);
+void queue_check_input_done(void);
+void check_reading_pause_resume(InputFile *ipf);
+
+void statemc_check_flushing_done(void);
+void statemc_check_backlog_done(void);
+
+void postfork(void);
+void period(void);
+
+void open_defer(void);
+void close_defer(void);
+void search_backlog_file(void);
+void preterminate(void);
+void raise_default(int signo) NORET;
+
+void inputfile_reading_start(InputFile *ipf);
+void inputfile_reading_stop(InputFile *ipf);
+void inputfile_reading_pause(InputFile *ipf);
+void inputfile_reading_resume(InputFile *ipf);
+ /* pause and resume are idempotent, and no-op if not done _reading_start */
+
+void filemon_start(InputFile *ipf);
+void filemon_stop(InputFile *ipf);
+void tailing_make_readable(InputFile *ipf);
+
+void vconnfail(Conn *conn, const char *fmt, va_list al) PRINTF(2,0);
+void connfail(Conn *conn, const char *fmt, ...) PRINTF(2,3);
+
+extern const oop_rd_style peer_rd_style;
+extern oop_rd_call peer_rd_err, peer_rd_ok;
+
+
+
--- /dev/null
+/*---------- defer and backlog files ----------*/
+
+static void open_defer(void) {
+ struct stat stab;
+
+ if (defer) return;
+
+ defer= fopen(path_defer, "a+");
+ if (!defer) sysdie("could not open defer file %s", path_defer);
+
+ /* truncate away any half-written records */
+
+ xfstat_isreg(fileno(defer), &stab, path_defer, "newly opened defer file");
+
+ if (stab.st_size > LONG_MAX)
+ crash("defer file %s size is far too large", path_defer);
+
+ if (!stab.st_size)
+ return;
+
+ long orgsize= stab.st_size;
+ long truncto= stab.st_size;
+ for (;;) {
+ if (!truncto) break; /* was only (if anything) one half-truncated record */
+ if (fseek(defer, truncto-1, SEEK_SET) < 0)
+ syscrash("seek in defer file %s while truncating partial", path_defer);
+
+ int r= getc(defer);
+ if (r==EOF) {
+ if (ferror(defer))
+ syscrash("failed read from defer file %s", path_defer);
+ else
+ crash("defer file %s shrank while we were checking it!", path_defer);
+ }
+ if (r=='\n') break;
+ truncto--;
+ }
+
+ if (stab.st_size != truncto) {
+ warn("truncating half-record at end of defer file %s -"
+ " shrinking by %ld bytes from %ld to %ld",
+ path_defer, orgsize - truncto, orgsize, truncto);
+
+ if (fflush(defer))
+ sysdie("could not flush defer file %s", path_defer);
+ if (ftruncate(fileno(defer), truncto))
+ syscrash("could not truncate defer file %s", path_defer);
+
+ } else {
+ info("continuing existing defer file %s (%ld bytes)",
+ path_defer, orgsize);
+ }
+ if (fseek(defer, truncto, SEEK_SET))
+ syscrash("could not seek to new end of defer file %s", path_defer);
+}
+
+static void close_defer(void) {
+ if (!defer)
+ return;
+
+ struct stat stab;
+ xfstat_isreg(fileno(defer), &stab, path_defer, "defer file");
+
+ if (fclose(defer)) sysdie("could not close defer file %s", path_defer);
+ defer= 0;
+
+ time_t now= xtime();
+
+ char *backlog= xasprintf("%s_backlog_%lu.%lu", feedfile,
+ (unsigned long)now,
+ (unsigned long)stab.st_ino);
+ if (link(path_defer, backlog))
+ sysdie("could not install defer file %s as backlog file %s",
+ path_defer, backlog);
+ if (unlink(path_defer))
+ syscrash("could not unlink old defer link %s to backlog file %s",
+ path_defer, backlog);
+
+ free(backlog);
+
+ if (until_backlog_nextscan < 0 ||
+ until_backlog_nextscan > backlog_retry_minperiods + 1)
+ until_backlog_nextscan= backlog_retry_minperiods + 1;
+}
+
+void poll_backlog_file(void) {
+ if (until_backlog_nextscan < 0) return;
+ if (until_backlog_nextscan-- > 0) return;
+ search_backlog_file();
+}
+
+static void search_backlog_file(void) {
+ /* returns non-0 iff there are any backlog files */
+
+ glob_t gl;
+ int r;
+ unsigned ui;
+ struct stat stab;
+ const char *oldest_path=0;
+ time_t oldest_mtime=0, now;
+
+ if (backlog_input_file) return;
+
+ try_again:
+
+ r= glob(globpat_backlog, GLOB_ERR|GLOB_MARK|GLOB_NOSORT, 0, &gl);
+
+ switch (r) {
+ case GLOB_ABORTED:
+ sysdie("failed to expand backlog pattern %s", globpat_backlog);
+ case GLOB_NOSPACE:
+ die("out of memory expanding backlog pattern %s", globpat_backlog);
+ case 0:
+ for (ui=0; ui<gl.gl_pathc; ui++) {
+ const char *path= gl.gl_pathv[ui];
+
+ if (strchr(path,'#') || strchr(path,'~')) {
+ dbg("backlog file search skipping %s", path);
+ continue;
+ }
+ r= stat(path, &stab);
+ if (r) {
+ syswarn("failed to stat backlog file %s", path);
+ continue;
+ }
+ if (!S_ISREG(stab.st_mode)) {
+ warn("backlog file %s is not a plain file (or link to one)", path);
+ continue;
+ }
+ if (!oldest_path || stab.st_mtime < oldest_mtime) {
+ oldest_path= path;
+ oldest_mtime= stab.st_mtime;
+ }
+ }
+ case GLOB_NOMATCH: /* fall through */
+ break;
+ default:
+ syscrash("glob expansion of backlog pattern %s gave unexpected"
+ " nonzero (error?) return value %d", globpat_backlog, r);
+ }
+
+ if (!oldest_path) {
+ dbg("backlog scan: none");
+
+ if (sms==sm_DROPPED) {
+ preterminate();
+ notice("feed dropped and our work is complete");
+
+ r= unlink(path_cli);
+ if (r && errno!=ENOENT)
+ syswarn("failed to unlink cli socket for old feed");
+
+ xunlink(path_lock, "lockfile for old feed");
+ exit(4);
+ }
+ until_backlog_nextscan= backlog_spontrescan_periods;
+ goto xfree;
+ }
+
+ now= xtime();
+ double age= difftime(now, oldest_mtime);
+ long age_deficiency= (backlog_retry_minperiods * period_seconds) - age;
+
+ if (age_deficiency <= 0) {
+ dbg("backlog scan: found age=%f deficiency=%ld oldest=%s",
+ age, age_deficiency, oldest_path);
+
+ backlog_input_file= open_input_file(oldest_path);
+ if (!backlog_input_file) {
+ warn("backlog file %s vanished as we opened it", oldest_path);
+ globfree(&gl);
+ goto try_again;
+ }
+ inputfile_reading_start(backlog_input_file);
+ until_backlog_nextscan= -1;
+ goto xfree;
+ }
+
+ until_backlog_nextscan= age_deficiency / period_seconds;
+
+ if (backlog_spontrescan_periods >= 0 &&
+ until_backlog_nextscan > backlog_spontrescan_periods)
+ until_backlog_nextscan= backlog_spontrescan_periods;
+
+ dbg("backlog scan: young age=%f deficiency=%ld nextscan=%d oldest=%s",
+ age, age_deficiency, until_backlog_nextscan, oldest_path);
+
+ xfree:
+ globfree(&gl);
+ return;
+}
+
--- /dev/null
+/*---------- filemon implemented with inotify ----------*/
+
+#if defined(HAVE_SYS_INOTIFY_H) && !defined(HAVE_FILEMON)
+#define HAVE_FILEMON
+
+#include <sys/inotify.h>
+
+static int filemon_inotify_fd;
+static int filemon_inotify_wdmax;
+static InputFile **filemon_inotify_wd2ipf;
+
+struct Filemon_Perfile {
+ int wd;
+};
+
+static void filemon_method_startfile(InputFile *ipf, Filemon_Perfile *pf) {
+ int wd= inotify_add_watch(filemon_inotify_fd, ipf->path, IN_MODIFY);
+ if (wd < 0) sysdie("inotify_add_watch %s", ipf->path);
+
+ if (wd >= filemon_inotify_wdmax) {
+ int newmax= wd+2;
+ filemon_inotify_wd2ipf= xrealloc(filemon_inotify_wd2ipf,
+ sizeof(*filemon_inotify_wd2ipf) * newmax);
+ memset(filemon_inotify_wd2ipf + filemon_inotify_wdmax, 0,
+ sizeof(*filemon_inotify_wd2ipf) * (newmax - filemon_inotify_wdmax));
+ filemon_inotify_wdmax= newmax;
+ }
+
+ assert(!filemon_inotify_wd2ipf[wd]);
+ filemon_inotify_wd2ipf[wd]= ipf;
+
+ dbg("filemon inotify startfile %p wd=%d wdmax=%d",
+ ipf, wd, filemon_inotify_wdmax);
+
+ pf->wd= wd;
+}
+
+static void filemon_method_stopfile(InputFile *ipf, Filemon_Perfile *pf) {
+ int wd= pf->wd;
+ dbg("filemon inotify stopfile %p wd=%d", ipf, wd);
+ int r= inotify_rm_watch(filemon_inotify_fd, wd);
+ if (r) syscrash("inotify_rm_watch");
+ filemon_inotify_wd2ipf[wd]= 0;
+}
+
+static void *filemon_inotify_readable(oop_source *lp, int fd,
+ oop_event e, void *u) {
+ struct inotify_event iev;
+ for (;;) {
+ int r= read(filemon_inotify_fd, &iev, sizeof(iev));
+ if (r==-1) {
+ if (isewouldblock(errno)) break;
+ syscrash("read from inotify master");
+ } else if (r==sizeof(iev)) {
+ assert(iev.wd >= 0 && iev.wd < filemon_inotify_wdmax);
+ } else {
+ crash("inotify read %d bytes wanted struct of %d", r, (int)sizeof(iev));
+ }
+ InputFile *ipf= filemon_inotify_wd2ipf[iev.wd];
+ /*dbg("filemon inotify readable read %p wd=%d", ipf, iev.wd);*/
+ tailing_make_readable(ipf);
+ }
+ return OOP_CONTINUE;
+}
+
+static int filemon_method_init(void) {
+ filemon_inotify_fd= inotify_init();
+ if (filemon_inotify_fd<0) {
+ syswarn("filemon/inotify: inotify_init failed");
+ return 0;
+ }
+ xsetnonblock(filemon_inotify_fd, 1);
+ loop->on_fd(loop, filemon_inotify_fd, OOP_READ, filemon_inotify_readable, 0);
+
+ dbg("filemon inotify init filemon_inotify_fd=%d", filemon_inotify_fd);
+ return 1;
+}
+
+static void filemon_method_dump_info(FILE *f) {
+ int i;
+ fprintf(f,"inotify");
+ DUMPV("%d",,filemon_inotify_fd);
+ DUMPV("%d",,filemon_inotify_wdmax);
+ for (i=0; i<filemon_inotify_wdmax; i++)
+ fprintf(f," wd2ipf[%d]=%p\n", i, filemon_inotify_wd2ipf[i]);
+}
+
+#endif /* HAVE_INOTIFY && !HAVE_FILEMON */
+
+/*---------- filemon dummy implementation ----------*/
+
+#if !defined(HAVE_FILEMON)
+
+struct Filemon_Perfile { int dummy; };
+
+static int filemon_method_init(void) {
+ warn("filemon/dummy: no filemon method compiled in");
+ return 0;
+}
+static void filemon_method_startfile(InputFile *ipf, Filemon_Perfile *pf) { }
+static void filemon_method_stopfile(InputFile *ipf, Filemon_Perfile *pf) { }
+static void filemon_method_dump_info(FILE *f) { fprintf(f,"dummy\n"); }
+
+#endif /* !HAVE_FILEMON */
+
+/*---------- filemon generic interface ----------*/
+
+static void filemon_start(InputFile *ipf) {
+ assert(!ipf->filemon);
+
+ NEW(ipf->filemon);
+ filemon_method_startfile(ipf, ipf->filemon);
+}
+
+static void filemon_stop(InputFile *ipf) {
+ if (!ipf->filemon) return;
+ filemon_method_stopfile(ipf, ipf->filemon);
+ free(ipf->filemon);
+ ipf->filemon= 0;
+}
+
--- /dev/null
+/*
+ * innduct
+ * tailing reliable realtime streaming feeder for inn
+ * logging and utility functions
+ *
+ * Copyright (C) 2010 Ian Jackson <ijackson@chiark.greenend.org.uk>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ *
+ * (I believe that when you compile and link this as part of the inn2
+ * build, with the Makefile runes I have provided, all the libraries
+ * and files which end up included in innduct are licence-compatible
+ * with GPLv3. If not then please let me know. -Ian Jackson.)
+ */
+
+#include "innduct.h"
+
+
+/* for logging, simulation, debugging, etc. */
+int simulate_flush= -1;
+int logv_use_syslog;
+const char *logv_prefix="";
+
+/*========== logging ==========*/
+
+static void logcore(int sysloglevel, const char *fmt, ...) PRINTF(2,3);
+static void logcore(int sysloglevel, const char *fmt, ...) {
+ VA;
+ if (logv_use_syslog) {
+ vsyslog(sysloglevel,fmt,al);
+ } else {
+ if (self_pid) fprintf(stderr,"[%lu] ",(unsigned long)self_pid);
+ vfprintf(stderr,fmt,al);
+ putc('\n',stderr);
+ }
+ va_end(al);
+}
+
+void logv(int sysloglevel, const char *pfx, int errnoval,
+ const char *fmt, va_list al) {
+ char msgbuf[1024]; /* NB do not call xvasprintf here or you'll recurse */
+ vsnprintf(msgbuf,sizeof(msgbuf), fmt,al);
+ msgbuf[sizeof(msgbuf)-1]= 0;
+
+ if (sysloglevel >= LOG_ERR && (errnoval==EACCES || errnoval==EPERM))
+ sysloglevel= LOG_ERR; /* run by wrong user, probably */
+
+ logcore(sysloglevel, "%s%s: %s%s%s",
+ logv_prefix, pfx, msgbuf,
+ errnoval>=0 ? ": " : "",
+ errnoval>=0 ? strerror(errnoval) : "");
+}
+
+#define DEFFATAL(fn, pfx, sysloglevel, err, estatus) \
+ void fn(const char *fmt, ...) { \
+ preterminate(); \
+ VA; \
+ logv(sysloglevel, pfx, err, fmt, al); \
+ exit(estatus); \
+ }
+
+#define DEFLOG(fn, pfx, sysloglevel, err) \
+ static void fn(const char *fmt, ...) { \
+ VA; \
+ logv(sysloglevel, pfx, err, fmt, al); \
+ va_end(al); \
+ }
+
+#define INNLOGSET_DECLARE(fn, pfx, sysloglevel) \
+ static void duct_log_##fn(int l, const char *fmt, va_list al, int errval) \
+ PRINTF(3,0); \
+ static void duct_log_##fn(int l, const char *fmt, va_list al, int errval) { \
+ logv(sysloglevel, pfx, errval ? errval : -1, fmt, al); \
+ }
+#define INNLOGSET_CALL(fn, pfx, sysloglevel) \
+ message_handlers_##fn(1, duct_log_##fn);
+
+
+static int innduct_fatal_cleanup(void) { return 12; } /* used for libinn die */
+
+/* We want to extend the set of logging functions from inn, and we
+ * want to prepend the site name to all our messages. */
+
+DEFFATAL(syscrash, "critical", LOG_CRIT, errno, 16);
+DEFFATAL(crash, "critical", LOG_CRIT, -1, 16);
+
+#define INNLOGSETS(INNLOGSET) \
+ INNLOGSET(die, "fatal", LOG_ERR) \
+ INNLOGSET(warn, "warning", LOG_WARNING) \
+ INNLOGSET(notice, "notice", LOG_NOTICE) \
+ INNLOGSET(trace, "trace", LOG_NOTICE)
+INNLOGSETS(INNLOGSET_DECLARE)
+
+DEFLOG(info, "info", LOG_INFO, -1)
+DEFLOG(dbg, "debug", LOG_DEBUG, -1)
+
+
+/*========== utility functions etc. ==========*/
+
+char *xvasprintf(const char *fmt, va_list al) {
+ char *str;
+ int rc= vasprintf(&str,fmt,al);
+ if (rc<0) sysdie("vasprintf(\"%s\",...) failed", fmt);
+ return str;
+}
+
+char *xasprintf(const char *fmt, ...) {
+ VA;
+ char *str= xvasprintf(fmt,al);
+ va_end(al);
+ return str;
+}
+
+int close_perhaps(int *fd) {
+ if (*fd <= 0) return 0;
+ int r= close(*fd);
+ *fd=0;
+ return r;
+}
+void xclose(int fd, const char *what, const char *what2) {
+ int r= close(fd);
+ if (r) syscrash("close %s%s",what,what2?what2:"");
+}
+void xclose_perhaps(int *fd, const char *what, const char *what2) {
+ if (*fd <= 0) return;
+ xclose(*fd,what,what2);
+ *fd=0;
+}
+
+pid_t xfork(const char *what) {
+ pid_t child;
+
+ child= fork();
+ if (child==-1) sysdie("cannot fork for %s",what);
+ dbg("forked %s %ld", what, (unsigned long)child);
+ if (!child) postfork();
+ return child;
+}
+
+void on_fd_read_except(int fd, oop_call_fd callback) {
+ loop->on_fd(loop, fd, OOP_READ, callback, 0);
+ loop->on_fd(loop, fd, OOP_EXCEPTION, callback, 0);
+}
+void cancel_fd_read_except(int fd) {
+ loop->cancel_fd(loop, fd, OOP_READ);
+ loop->cancel_fd(loop, fd, OOP_EXCEPTION);
+}
+
+void report_child_status(const char *what, int status) {
+ if (WIFEXITED(status)) {
+ int es= WEXITSTATUS(status);
+ if (es)
+ warn("%s: child died with error exit status %d", what, es);
+ } else if (WIFSIGNALED(status)) {
+ int sig= WTERMSIG(status);
+ const char *sigstr= strsignal(sig);
+ const char *coredump= WCOREDUMP(status) ? " (core dumped)" : "";
+ if (sigstr)
+ warn("%s: child died due to fatal signal %s%s", what, sigstr, coredump);
+ else
+ warn("%s: child died due to unknown fatal signal %d%s",
+ what, sig, coredump);
+ } else {
+ warn("%s: child died with unknown wait status %d", what,status);
+ }
+}
+
+int xwaitpid(pid_t *pid, const char *what) {
+ int status;
+
+ int r= kill(*pid, SIGKILL);
+ if (r) syscrash("cannot kill %s child", what);
+
+ pid_t got= waitpid(*pid, &status, 0);
+ if (got==-1) syscrash("cannot reap %s child", what);
+ if (got==0) crash("cannot reap %s child", what);
+
+ *pid= 0;
+
+ return status;
+}
+
+void *zxmalloc(size_t sz) {
+ void *p= xmalloc(sz);
+ memset(p,0,sz);
+ return p;
+}
+
+void xunlink(const char *path, const char *what) {
+ int r= unlink(path);
+ if (r) syscrash("can't unlink %s %s", path, what);
+}
+
+time_t xtime(void) {
+ time_t now= time(0);
+ if (now==-1) syscrash("time(2) failed");
+ return now;
+}
+
+void xsigaction(int signo, const struct sigaction *sa) {
+ int r= sigaction(signo,sa,0);
+ if (r) syscrash("sigaction failed for \"%s\"", strsignal(signo));
+}
+void xsigsetdefault(int signo) {
+ struct sigaction sa;
+ memset(&sa,0,sizeof(sa));
+ sa.sa_handler= SIG_DFL;
+ xsigaction(signo,&sa);
+}
+
+void xgettimeofday(struct timeval *tv_r) {
+ int r= gettimeofday(tv_r,0);
+ if (r) syscrash("gettimeofday(2) failed");
+}
+void xsetnonblock(int fd, int nonb) {
+ int errnoval= oop_fd_nonblock(fd, nonb);
+ if (errnoval) { errno= errnoval; syscrash("setnonblocking"); }
+}
+
+void check_isreg(const struct stat *stab, const char *path,
+ const char *what) {
+ if (!S_ISREG(stab->st_mode))
+ crash("%s %s not a plain file (mode 0%lo)",
+ what, path, (unsigned long)stab->st_mode);
+}
+
+static void xfstat(int fd, struct stat *stab_r, const char *what) {
+ int r= fstat(fd, stab_r);
+ if (r) syscrash("could not fstat %s", what);
+}
+
+static void xfstat_isreg(int fd, struct stat *stab_r,
+ const char *path, const char *what) {
+ xfstat(fd, stab_r, what);
+ check_isreg(stab_r, path, what);
+}
+
+void xlstat_isreg(const char *path, struct stat *stab,
+ int *enoent_r /* 0 means ENOENT is fatal */,
+ const char *what) {
+ int r= lstat(path, stab);
+ if (r) {
+ if (errno==ENOENT && enoent_r) { *enoent_r=1; return; }
+ syscrash("could not lstat %s %s", what, path);
+ }
+ if (enoent_r) *enoent_r= 0;
+ check_isreg(stab, path, what);
+}
+
+int samefile(const struct stat *a, const struct stat *b) {
+ assert(S_ISREG(a->st_mode));
+ assert(S_ISREG(b->st_mode));
+ return (a->st_ino == b->st_ino &&
+ a->st_dev == b->st_dev);
+}
+
+char *sanitise(const char *input, int len) {
+ static char sanibuf[100]; /* returns pointer to this buffer! */
+
+ const char *p= input;
+ const char *endp= len>=0 ? input+len : 0;
+ char *q= sanibuf;
+ *q++= '`';
+ for (;;) {
+ if (q > sanibuf+sizeof(sanibuf)-8) { strcpy(q,"'.."); break; }
+ int c= (!endp || p<endp) ? *p++ : 0;
+ if (!c) { *q++= '\''; *q=0; break; }
+ if (c>=' ' && c<=126 && c!='\\') { *q++= c; continue; }
+ sprintf(q,"\\x%02x",c);
+ q += 4;
+ }
+ return sanibuf;
+}
--- /dev/null
+/*========== monitoring of input files ==========*/
+
+static void feedfile_eof(InputFile *ipf) {
+ assert(ipf != main_input_file); /* promised by tailing_try_read */
+ inputfile_reading_stop(ipf);
+
+ if (ipf == flushing_input_file) {
+ assert(sms==sm_SEPARATED || sms==sm_DROPPING);
+ if (main_input_file) inputfile_reading_start(main_input_file);
+ statemc_check_flushing_done();
+ } else if (ipf == backlog_input_file) {
+ statemc_check_backlog_done();
+ } else {
+ abort(); /* supposed to wait rather than get EOF on main input file */
+ }
+}
+
+static InputFile *open_input_file(const char *path) {
+ int fd= open(path, O_RDWR);
+ if (fd<0) {
+ if (errno==ENOENT) return 0;
+ sysdie("unable to open input file %s", path);
+ }
+ assert(fd>0);
+
+ InputFile *ipf= xmalloc(sizeof(*ipf) + strlen(path) + 1);
+ memset(ipf,0,sizeof(*ipf));
+
+ ipf->fd= fd;
+ ipf->autodefer= -1;
+ LIST_INIT(ipf->queue);
+ strcpy(ipf->path, path);
+
+ return ipf;
+}
+
+static void close_input_file(InputFile *ipf) { /* does not free */
+ assert(!ipf->readable_callback); /* must have had ->on_cancel */
+ assert(!ipf->filemon); /* must have had inputfile_reading_stop */
+ assert(!ipf->rd); /* must have had inputfile_reading_stop */
+ assert(!ipf->inprogress); /* no dangling pointers pointing here */
+ xclose_perhaps(&ipf->fd, "input file ", ipf->path);
+}
+
+
+/*---------- dealing with articles read in the input file ----------*/
+
+static void *feedfile_got_bad_data(InputFile *ipf, off_t offset,
+ const char *data, const char *how) {
+ warn("corrupted file: %s, offset %lu: %s: in %s",
+ ipf->path, (unsigned long)offset, how, sanitise(data,-1));
+ ipf->readcount_err++;
+ if (ipf->readcount_err > max_bad_data_initial +
+ (ipf->readcount_ok+ipf->readcount_blank) / max_bad_data_ratio)
+ crash("too much garbage in input file! (%d errs, %d ok, %d blank)",
+ ipf->readcount_err, ipf->readcount_ok, ipf->readcount_blank);
+ return OOP_CONTINUE;
+}
+
+static void *feedfile_read_err(oop_source *lp, oop_read *rd,
+ oop_rd_event ev, const char *errmsg,
+ int errnoval, const char *data, size_t recsz,
+ void *ipf_v) {
+ InputFile *ipf= ipf_v;
+ assert(ev == OOP_RD_SYSTEM);
+ errno= errnoval;
+ syscrash("error reading input file: %s, offset %lu",
+ ipf->path, (unsigned long)ipf->offset);
+}
+
+static void *feedfile_got_article(oop_source *lp, oop_read *rd,
+ oop_rd_event ev, const char *errmsg,
+ int errnoval, const char *data, size_t recsz,
+ void *ipf_v) {
+ InputFile *ipf= ipf_v;
+ Article *art;
+ char tokentextbuf[sizeof(TOKEN)*2+3];
+
+ if (!data) { feedfile_eof(ipf); return OOP_CONTINUE; }
+
+ off_t old_offset= ipf->offset;
+ ipf->offset += recsz + !!(ev == OOP_RD_OK);
+
+#define X_BAD_DATA(m) return feedfile_got_bad_data(ipf,old_offset,data,m);
+
+ if (ev==OOP_RD_PARTREC)
+ feedfile_got_bad_data(ipf,old_offset,data,"missing final newline");
+ /* but process it anyway */
+
+ if (ipf->skippinglong) {
+ if (ev==OOP_RD_OK) ipf->skippinglong= 0; /* fine now */
+ return OOP_CONTINUE;
+ }
+ if (ev==OOP_RD_LONG) {
+ ipf->skippinglong= 1;
+ X_BAD_DATA("overly long line");
+ }
+
+ if (memchr(data,'\0',recsz)) X_BAD_DATA("nul byte");
+ if (!recsz) X_BAD_DATA("empty line");
+
+ if (data[0]==' ') {
+ if (strspn(data," ") != recsz) X_BAD_DATA("line partially blanked");
+ ipf->readcount_blank++;
+ return OOP_CONTINUE;
+ }
+
+ char *space= strchr(data,' ');
+ int tokenlen= space-data;
+ int midlen= (int)recsz-tokenlen-1;
+ if (midlen <= 2) X_BAD_DATA("no room for messageid");
+ if (space[1]!='<' || space[midlen]!='>') X_BAD_DATA("invalid messageid");
+
+ if (tokenlen != sizeof(TOKEN)*2+2) X_BAD_DATA("token wrong length");
+ memcpy(tokentextbuf, data, tokenlen);
+ tokentextbuf[tokenlen]= 0;
+ if (!IsToken(tokentextbuf)) X_BAD_DATA("token wrong syntax");
+
+ ipf->readcount_ok++;
+
+ art= xmalloc(sizeof(*art) - 1 + midlen + 1);
+ memset(art,0,sizeof(*art));
+ art->state= art_Unchecked;
+ art->midlen= midlen;
+ art->ipf= ipf; ipf->inprogress++;
+ art->token= TextToToken(tokentextbuf);
+ art->offset= old_offset;
+ art->blanklen= recsz;
+ strcpy(art->messageid, space+1);
+
+ if (ipf->autodefer >= 0) {
+ article_autodefer(ipf, art);
+ } else {
+ LIST_ADDTAIL(ipf->queue, art);
+
+ if (ipf==backlog_input_file)
+ article_check_expired(art);
+ }
+
+ if (sms==sm_NORMAL && ipf==main_input_file &&
+ ipf->offset >= target_max_feedfile_size)
+ statemc_start_flush("feed file size");
+
+ check_assign_articles(); /* may destroy conn but that's OK */
+ check_reading_pause_resume(ipf);
+ return OOP_CONTINUE;
+}
+
+/*========== tailing input file ==========*/
+
+static void *tailing_rable_call_time(oop_source *lp, struct timeval tv,
+ void *user) {
+ /* lifetime of ipf here is OK because destruction will cause
+ * on_cancel which will cancel this callback */
+ InputFile *ipf= user;
+
+ dbg("**TRACT** ipf=%p called",ipf);
+ if (!ipf->fake_readable) return OOP_CONTINUE;
+
+ /* we just keep calling readable until our caller (oop_rd)
+ * has called try_read, and try_read has found EOF so given EAGAIN */
+ dbg("**TRACT** ipf=%p reschedule",ipf);
+ loop->on_time(loop, OOP_TIME_NOW, tailing_rable_call_time, ipf);
+
+ return ipf->readable_callback(loop, &ipf->readable,
+ ipf->readable_callback_user);
+}
+
+static void tailing_on_cancel(struct oop_readable *rable) {
+ InputFile *ipf= (void*)rable;
+ dbg("**TOR** ipf=%p on_cancel",ipf);
+
+ if (ipf->filemon) filemon_stop(ipf);
+ dbg("**TRACT** ipf=%p cancel",ipf);
+ loop->cancel_time(loop, OOP_TIME_NOW, tailing_rable_call_time, ipf);
+ ipf->readable_callback= 0;
+}
+
+static void tailing_make_readable(InputFile *ipf) {
+ dbg("**TRACT** ipf=%p makereadable rcb=%p",ipf,
+ (void*)ipf?ipf->readable_callback:0);
+ if (!ipf || !ipf->readable_callback) /* so callers can be naive */
+ return;
+ ipf->fake_readable= 1;
+ loop->on_time(loop, OOP_TIME_NOW, tailing_rable_call_time, ipf);
+}
+
+static int tailing_on_readable(struct oop_readable *rable,
+ oop_readable_call *cb, void *user) {
+ InputFile *ipf= (void*)rable;
+ dbg("**TOR** ipf=%p on_readable",ipf);
+
+ tailing_on_cancel(rable);
+ ipf->readable_callback= cb;
+ ipf->readable_callback_user= user;
+ filemon_start(ipf);
+ tailing_make_readable(ipf);
+ return 0;
+}
+
+static ssize_t tailing_try_read(struct oop_readable *rable, void *buffer,
+ size_t length) {
+ InputFile *ipf= (void*)rable;
+ for (;;) {
+ ssize_t r= read(ipf->fd, buffer, length);
+ if (r==-1) {
+ if (errno==EINTR) continue;
+ ipf->fake_readable= 0;
+ return r;
+ }
+ if (!r) {
+ if (ipf==main_input_file) {
+ errno=EAGAIN;
+ ipf->fake_readable= 0;
+ return -1;
+ } else if (ipf==flushing_input_file) {
+ assert(ipf->rd);
+ assert(sms==sm_SEPARATED || sms==sm_DROPPING);
+ } else if (ipf==backlog_input_file) {
+ assert(ipf->rd);
+ } else {
+ abort();
+ }
+ }
+ dbg("**TOR** ipf=%p try_read r=%d",ipf,r);
+ return r;
+ }
+}
+
+/*---------- interface to start and stop an input file ----------*/
+
+static const oop_rd_style feedfile_rdstyle= {
+ OOP_RD_DELIM_STRIP, '\n',
+ OOP_RD_NUL_PERMIT,
+ OOP_RD_SHORTREC_LONG,
+};
+
+static void inputfile_reading_resume(InputFile *ipf) {
+ if (!ipf->rd) return;
+ if (!ipf->paused) return;
+
+ int r= oop_rd_read(ipf->rd, &feedfile_rdstyle, MAX_LINE_FEEDFILE,
+ feedfile_got_article,ipf, feedfile_read_err, ipf);
+ if (r) syscrash("unable start reading feedfile %s",ipf->path);
+
+ ipf->paused= 0;
+}
+
+static void inputfile_reading_pause(InputFile *ipf) {
+ if (!ipf->rd) return;
+ if (ipf->paused) return;
+ oop_rd_cancel(ipf->rd);
+ ipf->paused= 1;
+}
+
+static void inputfile_reading_start(InputFile *ipf) {
+ assert(!ipf->rd);
+ ipf->readable.on_readable= tailing_on_readable;
+ ipf->readable.on_cancel= tailing_on_cancel;
+ ipf->readable.try_read= tailing_try_read;
+ ipf->readable.delete_tidy= 0; /* we never call oop_rd_delete_{tidy,kill} */
+ ipf->readable.delete_kill= 0;
+
+ ipf->readable_callback= 0;
+ ipf->readable_callback_user= 0;
+
+ ipf->rd= oop_rd_new(loop, &ipf->readable, 0,0);
+ assert(ipf->rd);
+
+ ipf->paused= 1;
+ inputfile_reading_resume(ipf);
+}
+
+static void inputfile_reading_stop(InputFile *ipf) {
+ assert(ipf->rd);
+ inputfile_reading_pause(ipf);
+ oop_rd_delete(ipf->rd);
+ ipf->rd= 0;
+ assert(!ipf->filemon); /* we shouldn't be monitoring it now */
+}
+
+void filepoll(void) {
+ tailing_make_readable(main_input_file);
+ tailing_make_readable(flushing_input_file);
+}
+
/*
* innduct
* tailing reliable realtime streaming feeder for inn
+ * main program - option parsing and startup
*
* Copyright (C) 2010 Ian Jackson <ijackson@chiark.greenend.org.uk>
*
* with GPLv3. If not then please let me know. -Ian Jackson.)
*/
-/*
- * Newsfeeds file entries should look like this:
- * host.name.of.site[/exclude,exclude,...]\
- * :pattern,pattern...[/distribution,distribution...]\
- * :Tf,Wnm
- * :
- * or
- * sitename[/exclude,exclude,...]\
- * :pattern,pattern...[/distribution,distribution...]\
- * :Tf,Wnm
- * :host.name.of.site
- *
- * Four files full of
- * token messageid
- * or might be blanked out
- * <spc><spc><spc><spc>....
- *
- * F site.name main feed file
- * opened/created, then written, by innd
- * read by duct
- * unlinked by duct
- * tokens blanked out by duct when processed
- * site.name_lock lock preventing multiple ducts
- * to hold lock must open,F_SETLK[W]
- * and then stat to check that locked file
- * still has name site.name_lock
- * holder of this lock is "duct"
- * (only) lockholder may remove the lockfile
- * D site.name_flushing temporary feed file during flush (or crash)
- * hardlink created by duct
- * unlinked by duct
- * site.name_defer 431'd articles, still being written,
- * created, written, used by duct
- *
- * site.name_backlog.<date>.<inum>
- * 431'd articles, ready for innxmit or duct
- * created (link/mv) by duct
- * site.name_backlog<anything-else> (where <anything-else> does not
- * contain '#' or '~') eg
- * site.name_backlog.manual
- * anything the sysadmin likes (eg, feed files
- * from old feeds to be merged into this one)
- * created (link/mv) by admin
- * may be symlinks (in which case links
- * may be written through, but only links
- * will be removed.
- *
- * It is safe to remove backlog files manually,
- * if it's desired to throw away the backlog.
- *
- * Backlog files are also processed by innduct. We find the oldest
- * backlog file which is at least a certain amount old, and feed it
- * back into our processing. When every article in it has been read
- * and processed, we unlink it and look for another backlog file.
- *
- * If we don't have a backlog file that we're reading, we close the
- * defer file that we're writing and make it into a backlog file at
- * the first convenient opportunity.
- * -8<-
-
-
- OVERALL STATES:
-
- START
- |
- ,-->--. check F, D
- | | |
- | | |
- | | <----------------<---------------------------------'|
- | | F exists |
- | | D ENOENT |
- | | duct opens F |
- | V |
- | Normal |
- | F: innd writing, duct reading |
- | D: ENOENT |
- | | |
- | | duct decides time to flush |
- | | duct makes hardlink |
- | | |
- | V <------------------------'|
- | Hardlinked F==D |
- | F == D: innd writing, duct reading both exist |
- ^ | |
- | | duct unlinks F |
- | | <-----------<-------------<--'|
- | | open D F ENOENT |
- | | if exists |
- | | |
- | V <---------------------. |
- | Moved | |
- | F: ENOENT | |
- | D: innd writing, duct reading; or ENOENT | |
- | | | |
- | | duct requests flush of feed | |
- | | (others can too, harmlessly) | |
- | V | |
- | Flushing | |
- | F: ENOENT | |
- | D: innd flushing, duct; or ENOENT | |
- | | | |
- | | inndcomm flush fails | |
- | |`-------------------------->------------------' |
- | | |
- | | inndcomm reports no such site |
- | |`---------------------------------------------------- | -.
- | | | |
- | | innd finishes writing D, creates F | |
- | | inndcomm reports flush successful | |
- | | | |
- | V | |
- | Separated <----------------' |
- | F: innd writing F!=D /
- | D: duct reading; or ENOENT both exist /
- | | /
- | | duct gets to the end of D /
- | | duct opens F too /
- | V /
- | Finishing /
- | F: innd writing, duct reading |
- | D: duct finishing V
- | | Dropping
- | | duct finishes processing D F: ENOENT
- | V duct unlinks D D: duct reading
- | | |
- `--<--' | duct finishes
- | processing D
- | duct unlinks D
- | duct exits
- V
- Dropped
- F: ENOENT
- D: ENOENT
- duct not running
-
- "duct reading" means innduct is reading the file but also
- overwriting processed tokens.
-
- * ->8- -^L-
- *
- * rune for printing diagrams:
-
-perl -ne 'print if m/-8\<-/..m/-\>8-/; print "\f" if m/-\^L-/' backends/innduct.c |a2ps -R -B -ops
-
- *
- */
-
-/*============================== PROGRAM ==============================*/
-
-#define _GNU_SOURCE 1
-
-#include "config.h"
-#include "storage.h"
-#include "nntp.h"
-#include "libinn.h"
-#include "inndcomm.h"
-
-#include "inn/list.h"
-#include "inn/innconf.h"
-#include "inn/messages.h"
-
-#include <sys/uio.h>
-#include <sys/types.h>
-#include <sys/wait.h>
-#include <sys/stat.h>
-#include <sys/socket.h>
-#include <sys/un.h>
-#include <unistd.h>
-#include <string.h>
-#include <signal.h>
-#include <stdio.h>
-#include <errno.h>
-#include <syslog.h>
-#include <fcntl.h>
-#include <stdarg.h>
-#include <assert.h>
-#include <stdlib.h>
-#include <stddef.h>
-#include <glob.h>
-#include <time.h>
-#include <math.h>
-#include <ctype.h>
-
-#include <oop.h>
-#include <oop-read.h>
-
-/*----- general definitions, probably best not changed -----*/
-
-#define CONNCHILD_ESTATUS_STREAM 24
-#define CONNCHILD_ESTATUS_NOSTREAM 25
-
-#define INNDCOMMCHILD_ESTATUS_FAIL 26
-#define INNDCOMMCHILD_ESTATUS_NONESUCH 27
-
-#define MAX_LINE_FEEDFILE (NNTP_MSGID_MAXLEN + sizeof(TOKEN)*2 + 10)
-#define MAX_CLI_COMMAND 1000
-
-#define VA va_list al; va_start(al,fmt)
-#define PRINTF(f,a) __attribute__((__format__(printf,f,a)))
-#define NORET_PRINTF(f,a) __attribute__((__noreturn__,__format__(printf,f,a)))
-#define NORET __attribute__((__noreturn__))
-
-#define NEW(ptr) ((ptr)= zxmalloc(sizeof(*(ptr))))
-#define NEW_DECL(type,ptr) type ptr = zxmalloc(sizeof(*(ptr)))
-
-#define DUMPV(fmt,pfx,v) fprintf(f, " " #v "=" fmt, pfx v);
-
-#define FOR_CONN(conn) \
- for ((conn)=LIST_HEAD(conns); (conn); (conn)=LIST_NEXT((conn)))
-
-/*----- doubly linked lists -----*/
-
-#define ISNODE(T) struct node list_node
-#define DEFLIST(T) \
- typedef struct { \
- union { struct list li; T *for_type; } u; \
- int count; \
- } T##List
-
-#define NODE(n) (assert((void*)&(n)->list_node == (n)), &(n)->list_node)
-
-#define LIST_CHECKCANHAVENODE(l,n) \
- ((void)((n) == ((l).u.for_type))) /* just for the type check */
-
-#define LIST_ADDSOMEHOW(l,n,list_addsomehow) \
- ( LIST_CHECKCANHAVENODE(l,n), \
- list_addsomehow(&(l).u.li, NODE((n))), \
- (void)(l).count++ \
- )
-
-#define LIST_REMSOMEHOW(l,list_remsomehow) \
- ( (typeof((l).u.for_type)) \
- ( (l).count \
- ? ( (l).count--, \
- list_remsomehow(&(l).u.li) ) \
- : 0 \
- ) \
- )
-
-
-#define LIST_ADDHEAD(l,n) LIST_ADDSOMEHOW((l),(n),list_addhead)
-#define LIST_ADDTAIL(l,n) LIST_ADDSOMEHOW((l),(n),list_addtail)
-#define LIST_REMHEAD(l) LIST_REMSOMEHOW((l),list_remhead)
-#define LIST_REMTAIL(l) LIST_REMSOMEHOW((l),list_remtail)
-
-#define LIST_INIT(l) ((l).count=0, list_new(&(l).u.li))
-#define LIST_HEAD(l) ((typeof((l).u.for_type))(list_head((struct list*)&(l))))
-#define LIST_NEXT(n) ((typeof(n))list_succ(NODE((n))))
-#define LIST_BACK(n) ((typeof(n))list_pred(NODE((n))))
-
-#define LIST_REMOVE(l,n) \
- ( LIST_CHECKCANHAVENODE(l,n), \
- list_remove(NODE((n))), \
- (void)(l).count-- \
- )
-
-#define LIST_INSERT(l,n,pred) \
- ( LIST_CHECKCANHAVENODE(l,n), \
- LIST_CHECKCANHAVENODE(l,pred), \
- list_insert((struct list*)&(l), NODE((n)), NODE((pred))), \
- (void)(l).count++ \
- )
-
-/*----- type predeclarations -----*/
-
-typedef struct Conn Conn;
-typedef struct Article Article;
-typedef struct InputFile InputFile;
-typedef struct XmitDetails XmitDetails;
-typedef struct Filemon_Perfile Filemon_Perfile;
-typedef enum StateMachineState StateMachineState;
-typedef struct CliCommand CliCommand;
-
-DEFLIST(Conn);
-DEFLIST(Article);
-
-/*----- function predeclarations -----*/
-
-static void conn_maybe_write(Conn *conn);
-static void conn_make_some_xmits(Conn *conn);
-static void *conn_write_some_xmits(Conn *conn);
-
-static void xmit_free(XmitDetails *d);
-
-#define SMS(newstate, periods, why) \
- (statemc_setstate(sm_##newstate,(periods),#newstate,(why)))
-static void statemc_setstate(StateMachineState newsms, int periods,
- const char *forlog, const char *why);
-
-static void statemc_start_flush(const char *why); /* Normal => Flushing */
-static void spawn_inndcomm_flush(const char *why); /* Moved => Flushing */
-static int trigger_flush_ok(const char *why /* 0 means timeout */);
- /* => Flushing,FLUSHING, ret 1; or ret 0 */
-
-static void article_done(Article *art, int whichcount);
-
-static void check_assign_articles(void);
-static void queue_check_input_done(void);
-static void check_reading_pause_resume(InputFile *ipf);
-
-static void statemc_check_flushing_done(void);
-static void statemc_check_backlog_done(void);
-
-static void postfork(void);
-static void period(void);
-
-static void open_defer(void);
-static void close_defer(void);
-static void search_backlog_file(void);
-static void preterminate(void);
-static void raise_default(int signo) NORET;
-
-static void inputfile_reading_start(InputFile *ipf);
-static void inputfile_reading_stop(InputFile *ipf);
-static void inputfile_reading_pause(InputFile *ipf);
-static void inputfile_reading_resume(InputFile *ipf);
- /* pause and resume are idempotent, and no-op if not done _reading_start */
-
-static void filemon_start(InputFile *ipf);
-static void filemon_stop(InputFile *ipf);
-static void tailing_make_readable(InputFile *ipf);
-
-static void vconnfail(Conn *conn, const char *fmt, va_list al) PRINTF(2,0);
-static void connfail(Conn *conn, const char *fmt, ...) PRINTF(2,3);
-
-static const oop_rd_style peer_rd_style;
-static oop_rd_call peer_rd_err, peer_rd_ok;
-
-
-/*----- configuration options -----*/
-/* when changing defaults, remember to update the manpage */
-
-static const char *sitename, *remote_host;
-static const char *feedfile, *path_run, *path_cli, *path_cli_dir;
-static int quiet_multiple=0;
-static int interactive=0, try_filemon=1;
-static int try_stream=1;
-static int port=119;
-static const char *inndconffile;
-
-static int max_connections=10;
-static int max_queue_per_conn=200;
-static int target_max_feedfile_size=100000;
-static int period_seconds=30;
-static int filepoll_seconds=5;
-static int max_queue_per_ipf=-1;
-
-static int connection_setup_timeout=200;
-static int inndcomm_flush_timeout=100;
-
-static double nocheck_thresh= 95.0; /* converted from percentage by main */
-static double nocheck_decay= 100; /* conv'd from articles to lambda by main */
-
-/* all these are initialised to seconds, and converted to periods in main */
-static int reconnect_delay_periods=1000;
-static int flushfail_retry_periods=1000;
-static int backlog_retry_minperiods=100;
-static int backlog_spontrescan_periods=300;
-static int spontaneous_flush_periods=100000;
-static int max_separated_periods=2000;
-static int need_activity_periods=1000;
-static int lowvol_thresh=3;
-static int lowvol_periods=1000;
-
-static double max_bad_data_ratio= 1; /* conv'd from percentage by main */
-static int max_bad_data_initial= 30;
- /* in one corrupt 4096-byte block the number of newlines has
- * mean 16 and standard deviation 3.99. 30 corresponds to z=+3.5 */
-
-
-/*----- statistics -----*/
-
-typedef enum { /* in queue in conn->sent */
- art_Unchecked, /* not checked, not sent checking */
- art_Wanted, /* checked, wanted sent body as requested */
- art_Unsolicited, /* - sent body without check */
- art_MaxState,
-} ArtState;
-
-static const char *const artstate_names[]=
- { "Unchecked", "Wanted", "Unsolicited", 0 };
-
-#define RESULT_COUNTS(RCS,RCN) \
- RCS(sent) \
- RCS(accepted) \
- RCN(unwanted) \
- RCN(rejected) \
- RCN(deferred) \
- RCN(missing) \
- RCN(connretry)
-
-#define RCI_TRIPLE_FMT_BASE "%d (id=%d,bod=%d,nc=%d)"
-#define RCI_TRIPLE_VALS_BASE(counts,x) \
- counts[art_Unchecked] x \
- + counts[art_Wanted] x \
- + counts[art_Unsolicited] x, \
- counts[art_Unchecked] x \
- , counts[art_Wanted] x \
- , counts[art_Unsolicited] x
-
-typedef enum {
-#define RC_INDEX(x) RC_##x,
- RESULT_COUNTS(RC_INDEX, RC_INDEX)
- RCI_max
-} ResultCountIndex;
-
-
-/*----- transmission buffers -----*/
-
-#define CONNIOVS 128
-
-typedef enum {
- xk_Const, xk_Artdata
-} XmitKind;
-
-struct XmitDetails {
- XmitKind kind;
- union {
- ARTHANDLE *sm_art;
- } info;
-};
-
-
-/*----- core operational data structure types -----*/
-
-struct InputFile {
- /* This is also an instance of struct oop_readable */
- struct oop_readable readable; /* first */
- oop_readable_call *readable_callback;
- void *readable_callback_user;
-
- int fd;
- Filemon_Perfile *filemon;
-
- oop_read *rd; /* non-0: reading; 0: constructing, or had EOF */
- off_t offset;
- int skippinglong, paused, fake_readable;
-
- ArticleList queue;
- long inprogress; /* includes queue.count and also articles in conns */
- long autodefer; /* -1 means not doing autodefer */
-
- int counts[art_MaxState][RCI_max];
- int readcount_ok, readcount_blank, readcount_err, count_nooffer_missing;
- char path[];
-};
-
-struct Article {
- ISNODE(Article);
- ArtState state;
- int midlen, missing;
- InputFile *ipf;
- TOKEN token;
- off_t offset;
- int blanklen;
- char messageid[1];
-};
-
-#define SMS_LIST(X) \
- X(NORMAL) \
- X(FLUSHING) \
- X(FLUSHFAILED) \
- X(SEPARATED) \
- X(DROPPING) \
- X(DROPPED)
-
-enum StateMachineState {
-#define SMS_DEF_ENUM(s) sm_##s,
- SMS_LIST(SMS_DEF_ENUM)
-};
-
-static const char *sms_names[]= {
-#define SMS_DEF_NAME(s) #s ,
- SMS_LIST(SMS_DEF_NAME)
- 0
-};
-
-struct Conn {
- ISNODE(Conn);
- int fd; /* may be 0, meaning closed (during construction/destruction) */
- oop_read *rd; /* likewise */
- int oopwriting; /* since on_fd is not idempotent */
- int max_queue, stream;
- const char *quitting;
- int since_activity; /* periods */
- ArticleList waiting; /* not yet told peer */
- ArticleList priority; /* peer says send it now */
- ArticleList sent; /* offered/transmitted - in xmit or waiting reply */
- struct iovec xmit[CONNIOVS];
- XmitDetails xmitd[CONNIOVS];
- int xmitu;
-};
-
-
-/*----- general operational variables -----*/
-
-/* main initialises */
-static oop_source *loop;
-static ConnList conns;
-static char *path_lock, *path_flushing, *path_defer, *path_dump;
-static char *globpat_backlog;
-static pid_t self_pid;
-static int *lowvol_perperiod;
-static int lowvol_circptr;
-static int lowvol_total; /* does not include current period */
-
-/* statemc_init initialises */
-static StateMachineState sms;
-static int until_flush;
-static InputFile *main_input_file, *flushing_input_file, *backlog_input_file;
-static FILE *defer;
-
-/* initialisation to 0 is good */
-static int until_connect, until_backlog_nextscan;
-static double accept_proportion;
-static int nocheck, nocheck_reported, in_child;
-
-/* for logging, simulation, debugging, etc. */
-int simulate_flush= -1;
-int logv_use_syslog;
-static const char *logv_prefix="";
-
-/*========== logging ==========*/
-
-static void logcore(int sysloglevel, const char *fmt, ...) PRINTF(2,3);
-static void logcore(int sysloglevel, const char *fmt, ...) {
- VA;
- if (logv_use_syslog) {
- vsyslog(sysloglevel,fmt,al);
- } else {
- if (self_pid) fprintf(stderr,"[%lu] ",(unsigned long)self_pid);
- vfprintf(stderr,fmt,al);
- putc('\n',stderr);
- }
- va_end(al);
-}
-
-static void logv(int sysloglevel, const char *pfx, int errnoval,
- const char *fmt, va_list al) PRINTF(5,0);
-static void logv(int sysloglevel, const char *pfx, int errnoval,
- const char *fmt, va_list al) {
- char msgbuf[1024]; /* NB do not call xvasprintf here or you'll recurse */
- vsnprintf(msgbuf,sizeof(msgbuf), fmt,al);
- msgbuf[sizeof(msgbuf)-1]= 0;
-
- if (sysloglevel >= LOG_ERR && (errnoval==EACCES || errnoval==EPERM))
- sysloglevel= LOG_ERR; /* run by wrong user, probably */
-
- logcore(sysloglevel, "%s%s: %s%s%s",
- logv_prefix, pfx, msgbuf,
- errnoval>=0 ? ": " : "",
- errnoval>=0 ? strerror(errnoval) : "");
-}
-
-#define DEFFATAL(fn, pfx, sysloglevel, err, estatus) \
- static void fn(const char *fmt, ...) NORET_PRINTF(1,2); \
- static void fn(const char *fmt, ...) { \
- preterminate(); \
- VA; \
- logv(sysloglevel, pfx, err, fmt, al); \
- exit(estatus); \
- }
-
-#define DEFLOG(fn, pfx, sysloglevel, err) \
- static void fn(const char *fmt, ...) PRINTF(1,2); \
- static void fn(const char *fmt, ...) { \
- VA; \
- logv(sysloglevel, pfx, err, fmt, al); \
- va_end(al); \
- }
-
-#define INNLOGSET_DECLARE(fn, pfx, sysloglevel) \
- static void duct_log_##fn(int l, const char *fmt, va_list al, int errval) \
- PRINTF(3,0); \
- static void duct_log_##fn(int l, const char *fmt, va_list al, int errval) { \
- logv(sysloglevel, pfx, errval ? errval : -1, fmt, al); \
- }
-#define INNLOGSET_CALL(fn, pfx, sysloglevel) \
- message_handlers_##fn(1, duct_log_##fn);
-
-
-static int innduct_fatal_cleanup(void) { return 12; } /* used for libinn die */
-
-/* We want to extend the set of logging functions from inn, and we
- * want to prepend the site name to all our messages. */
-
-DEFFATAL(syscrash, "critical", LOG_CRIT, errno, 16);
-DEFFATAL(crash, "critical", LOG_CRIT, -1, 16);
-
-#define INNLOGSETS(INNLOGSET) \
- INNLOGSET(die, "fatal", LOG_ERR) \
- INNLOGSET(warn, "warning", LOG_WARNING) \
- INNLOGSET(notice, "notice", LOG_NOTICE) \
- INNLOGSET(trace, "trace", LOG_NOTICE)
-INNLOGSETS(INNLOGSET_DECLARE)
-
-DEFLOG(info, "info", LOG_INFO, -1)
-DEFLOG(dbg, "debug", LOG_DEBUG, -1)
-
-
-/*========== utility functions etc. ==========*/
-
-static char *xvasprintf(const char *fmt, va_list al) PRINTF(1,0);
-static char *xvasprintf(const char *fmt, va_list al) {
- char *str;
- int rc= vasprintf(&str,fmt,al);
- if (rc<0) sysdie("vasprintf(\"%s\",...) failed", fmt);
- return str;
-}
-static char *xasprintf(const char *fmt, ...) PRINTF(1,2);
-static char *xasprintf(const char *fmt, ...) {
- VA;
- char *str= xvasprintf(fmt,al);
- va_end(al);
- return str;
-}
-
-static int close_perhaps(int *fd) {
- if (*fd <= 0) return 0;
- int r= close(*fd);
- *fd=0;
- return r;
-}
-static void xclose(int fd, const char *what, const char *what2) {
- int r= close(fd);
- if (r) syscrash("close %s%s",what,what2?what2:"");
-}
-static void xclose_perhaps(int *fd, const char *what, const char *what2) {
- if (*fd <= 0) return;
- xclose(*fd,what,what2);
- *fd=0;
-}
-
-static pid_t xfork(const char *what) {
- pid_t child;
-
- child= fork();
- if (child==-1) sysdie("cannot fork for %s",what);
- dbg("forked %s %ld", what, (unsigned long)child);
- if (!child) postfork();
- return child;
-}
-
-static void on_fd_read_except(int fd, oop_call_fd callback) {
- loop->on_fd(loop, fd, OOP_READ, callback, 0);
- loop->on_fd(loop, fd, OOP_EXCEPTION, callback, 0);
-}
-static void cancel_fd_read_except(int fd) {
- loop->cancel_fd(loop, fd, OOP_READ);
- loop->cancel_fd(loop, fd, OOP_EXCEPTION);
-}
-
-static void report_child_status(const char *what, int status) {
- if (WIFEXITED(status)) {
- int es= WEXITSTATUS(status);
- if (es)
- warn("%s: child died with error exit status %d", what, es);
- } else if (WIFSIGNALED(status)) {
- int sig= WTERMSIG(status);
- const char *sigstr= strsignal(sig);
- const char *coredump= WCOREDUMP(status) ? " (core dumped)" : "";
- if (sigstr)
- warn("%s: child died due to fatal signal %s%s", what, sigstr, coredump);
- else
- warn("%s: child died due to unknown fatal signal %d%s",
- what, sig, coredump);
- } else {
- warn("%s: child died with unknown wait status %d", what,status);
- }
-}
-
-static int xwaitpid(pid_t *pid, const char *what) {
- int status;
-
- int r= kill(*pid, SIGKILL);
- if (r) syscrash("cannot kill %s child", what);
-
- pid_t got= waitpid(*pid, &status, 0);
- if (got==-1) syscrash("cannot reap %s child", what);
- if (got==0) crash("cannot reap %s child", what);
-
- *pid= 0;
-
- return status;
-}
-
-static void *zxmalloc(size_t sz) {
- void *p= xmalloc(sz);
- memset(p,0,sz);
- return p;
-}
-
-static void xunlink(const char *path, const char *what) {
- int r= unlink(path);
- if (r) syscrash("can't unlink %s %s", path, what);
-}
-
-static time_t xtime(void) {
- time_t now= time(0);
- if (now==-1) syscrash("time(2) failed");
- return now;
-}
-
-static void xsigaction(int signo, const struct sigaction *sa) {
- int r= sigaction(signo,sa,0);
- if (r) syscrash("sigaction failed for \"%s\"", strsignal(signo));
-}
-
-static void xsigsetdefault(int signo) {
- struct sigaction sa;
- memset(&sa,0,sizeof(sa));
- sa.sa_handler= SIG_DFL;
- xsigaction(signo,&sa);
-}
-
-static void xgettimeofday(struct timeval *tv_r) {
- int r= gettimeofday(tv_r,0);
- if (r) syscrash("gettimeofday(2) failed");
-}
-
-static void xsetnonblock(int fd, int nonb) {
- int errnoval= oop_fd_nonblock(fd, nonb);
- if (errnoval) { errno= errnoval; syscrash("setnonblocking"); }
-}
-
-static void check_isreg(const struct stat *stab, const char *path,
- const char *what) {
- if (!S_ISREG(stab->st_mode))
- crash("%s %s not a plain file (mode 0%lo)",
- what, path, (unsigned long)stab->st_mode);
-}
-
-static void xfstat(int fd, struct stat *stab_r, const char *what) {
- int r= fstat(fd, stab_r);
- if (r) syscrash("could not fstat %s", what);
-}
-
-static void xfstat_isreg(int fd, struct stat *stab_r,
- const char *path, const char *what) {
- xfstat(fd, stab_r, what);
- check_isreg(stab_r, path, what);
-}
-
-static void xlstat_isreg(const char *path, struct stat *stab,
- int *enoent_r /* 0 means ENOENT is fatal */,
- const char *what) {
- int r= lstat(path, stab);
- if (r) {
- if (errno==ENOENT && enoent_r) { *enoent_r=1; return; }
- syscrash("could not lstat %s %s", what, path);
- }
- if (enoent_r) *enoent_r= 0;
- check_isreg(stab, path, what);
-}
-
-static int samefile(const struct stat *a, const struct stat *b) {
- assert(S_ISREG(a->st_mode));
- assert(S_ISREG(b->st_mode));
- return (a->st_ino == b->st_ino &&
- a->st_dev == b->st_dev);
-}
-
-static char *sanitise(const char *input, int len) {
- static char sanibuf[100]; /* returns pointer to this buffer! */
-
- const char *p= input;
- const char *endp= len>=0 ? input+len : 0;
- char *q= sanibuf;
- *q++= '`';
- for (;;) {
- if (q > sanibuf+sizeof(sanibuf)-8) { strcpy(q,"'.."); break; }
- int c= (!endp || p<endp) ? *p++ : 0;
- if (!c) { *q++= '\''; *q=0; break; }
- if (c>=' ' && c<=126 && c!='\\') { *q++= c; continue; }
- sprintf(q,"\\x%02x",c);
- q += 4;
- }
- return sanibuf;
-}
-
-static int isewouldblock(int errnoval) {
- return errnoval==EWOULDBLOCK || errnoval==EAGAIN;
-}
-
-/*========== command and control (CLI) connections ==========*/
-
-static int cli_master;
-
-typedef struct CliConn CliConn;
-struct CliConn {
- void (*destroy)(CliConn*);
- int fd;
- oop_read *rd;
- FILE *out;
- union {
- struct sockaddr sa;
- struct sockaddr_un un;
- } sa;
- socklen_t salen;
-};
-
-static const oop_rd_style cli_rd_style= {
- OOP_RD_DELIM_STRIP, '\n',
- OOP_RD_NUL_FORBID,
- OOP_RD_SHORTREC_FORBID
-};
-
-static void cli_destroy(CliConn *cc) {
- cc->destroy(cc);
-}
-
-static void cli_checkouterr(CliConn *cc /* may destroy*/) {
- if (ferror(cc->out) | fflush(cc->out)) {
- info("CTRL%d write error %s", cc->fd, strerror(errno));
- cli_destroy(cc);
- }
-}
-
-static void cli_prompt(CliConn *cc /* may destroy*/) {
- fprintf(cc->out, "%s| ", sitename);
- cli_checkouterr(cc);
-}
-
-struct CliCommand {
- const char *cmd;
- void (*f)(CliConn *cc, const CliCommand *ccmd,
- const char *arg, size_t argsz);
- void *xdata;
- int xval;
-};
-
-static const CliCommand cli_commands[];
-
-#define CCMD(wh) \
- static void ccmd_##wh(CliConn *cc, const CliCommand *c, \
- const char *arg, size_t argsz)
-
-CCMD(help) {
- fputs("commands:\n", cc->out);
- const CliCommand *ccmd;
- for (ccmd=cli_commands; ccmd->cmd; ccmd++)
- fprintf(cc->out, " %s\n", ccmd->cmd);
- fputs("NB: permissible arguments are not shown above."
- " Not all commands listed are safe. See innduct(8).\n", cc->out);
-}
-
-CCMD(flush) {
- int ok= trigger_flush_ok("manual request");
- if (!ok) fprintf(cc->out,"already flushing (state is %s)\n", sms_names[sms]);
-}
-
-CCMD(stop) {
- preterminate();
- notice("terminating (CTRL%d)",cc->fd);
- raise_default(SIGTERM);
- abort();
-}
-
-CCMD(dump);
-
-/* messing with our head: */
-CCMD(period) { period(); }
-CCMD(setintarg) { *(int*)c->xdata= atoi(arg); }
-CCMD(setint) { *(int*)c->xdata= c->xval; }
-CCMD(setint_period) { *(int*)c->xdata= c->xval; period(); }
-
-static const CliCommand cli_commands[]= {
- { "h", ccmd_help },
- { "flush", ccmd_flush },
- { "stop", ccmd_stop },
- { "dump q", ccmd_dump, 0,0 },
- { "dump a", ccmd_dump, 0,1 },
-
- { "p", ccmd_period },
-
-#define POKES(cmd,func) \
- { cmd "flush", func, &until_flush, 1 }, \
- { cmd "conn", func, &until_connect, 0 }, \
- { cmd "blscan", func, &until_backlog_nextscan, 0 },
-POKES("next ", ccmd_setint)
-POKES("prod ", ccmd_setint_period)
-
- { "pretend flush", ccmd_setintarg, &simulate_flush },
- { "wedge blscan", ccmd_setint, &until_backlog_nextscan, -1 },
- { 0 }
-};
-
-static void *cli_rd_ok(oop_source *lp, oop_read *oread, oop_rd_event ev,
- const char *errmsg, int errnoval,
- const char *data, size_t recszu, void *cc_v) {
- CliConn *cc= cc_v;
-
- if (!data) {
- info("CTRL%d closed", cc->fd);
- cc->destroy(cc);
- return OOP_CONTINUE;
- }
-
- if (recszu == 0) goto prompt;
- assert(recszu <= INT_MAX);
- int recsz= recszu;
-
- const CliCommand *ccmd;
- for (ccmd=cli_commands; ccmd->cmd; ccmd++) {
- int l= strlen(ccmd->cmd);
- if (recsz < l) continue;
- if (recsz > l && data[l] != ' ') continue;
- if (memcmp(data, ccmd->cmd, l)) continue;
-
- int argl= (int)recsz - (l+1);
- ccmd->f(cc, ccmd, argl>=0 ? data+l+1 : 0, argl);
- goto prompt;
- }
-
- fputs("unknown command; h for help\n", cc->out);
-
- prompt:
- cli_prompt(cc);
- return OOP_CONTINUE;
-}
-
-static void *cli_rd_err(oop_source *lp, oop_read *oread, oop_rd_event ev,
- const char *errmsg, int errnoval,
- const char *data, size_t recsz, void *cc_v) {
- CliConn *cc= cc_v;
-
- info("CTRL%d read error %s", cc->fd, errmsg);
- cc->destroy(cc);
- return OOP_CONTINUE;
-}
-
-static int cli_conn_startup(CliConn *cc /* may destroy*/,
- const char *how) {
- cc->rd= oop_rd_new_fd(loop, cc->fd, 0,0);
- if (!cc->rd) { warn("oop_rd_new_fd cli failed"); return -1; }
-
- int er= oop_rd_read(cc->rd, &cli_rd_style, MAX_CLI_COMMAND,
- cli_rd_ok, cc,
- cli_rd_err, cc);
- if (er) { errno= er; syswarn("oop_rd_read cli failed"); return -1; }
-
- info("CTRL%d %s ready", cc->fd, how);
- cli_prompt(cc);
- return 0;
-}
-
-static void cli_stdio_destroy(CliConn *cc) {
- if (cc->rd) {
- oop_rd_cancel(cc->rd);
- errno= oop_rd_delete_tidy(cc->rd);
- if (errno) syswarn("oop_rd_delete tidy failed (no-nonblock stdin?)");
- }
- free(cc);
-}
-
-static void cli_stdio(void) {
- NEW_DECL(CliConn *,cc);
- cc->destroy= cli_stdio_destroy;
-
- cc->fd= 0;
- cc->out= stdout;
- int r= cli_conn_startup(cc,"stdio");
- if (r) cc->destroy(cc);
-}
-
-static void cli_accepted_destroy(CliConn *cc) {
- if (cc->rd) {
- oop_rd_cancel(cc->rd);
- oop_rd_delete_kill(cc->rd);
- }
- if (cc->out) { fclose(cc->out); cc->fd=0; }
- close_perhaps(&cc->fd);
- free(cc);
-}
-
-static void *cli_master_readable(oop_source *lp, int master,
- oop_event ev, void *u) {
- NEW_DECL(CliConn *,cc);
- cc->destroy= cli_accepted_destroy;
-
- cc->salen= sizeof(cc->sa);
- cc->fd= accept(master, &cc->sa.sa, &cc->salen);
- if (cc->fd<0) { syswarn("error accepting cli connection"); goto x; }
-
- cc->out= fdopen(cc->fd, "w");
- if (!cc->out) { syswarn("error fdopening accepted cli connection"); goto x; }
-
- int r= cli_conn_startup(cc, "accepted");
- if (r) goto x;
-
- return OOP_CONTINUE;
-
- x:
- cc->destroy(cc);
- return OOP_CONTINUE;
-}
-
-#define NOCLI(...) do{ \
- syswarn("no cli listener, because failed to " __VA_ARGS__); \
- goto nocli; \
- }while(0)
-
-static void cli_init(void) {
- union {
- struct sockaddr sa;
- struct sockaddr_un un;
- } sa;
-
- memset(&sa,0,sizeof(sa));
- int maxlen= sizeof(sa.un.sun_path);
-
- if (!path_cli) {
- info("control command line disabled");
- return;
- }
-
- int pathlen= strlen(path_cli);
- if (pathlen > maxlen) {
- warn("no cli listener, because cli socket path %s too long (%d>%d)",
- path_cli, pathlen, maxlen);
- return;
- }
-
- if (path_cli_dir) {
- int r= mkdir(path_cli_dir, 0700);
- if (r && errno!=EEXIST)
- NOCLI("create cli socket directory %s", path_cli_dir);
- }
-
- int r= unlink(path_cli);
- if (r && errno!=ENOENT)
- NOCLI("remove old cli socket %s", path_cli);
-
- cli_master= socket(PF_UNIX, SOCK_STREAM, 0);
- if (cli_master<0) NOCLI("create new cli master socket");
-
- int sl= pathlen + offsetof(struct sockaddr_un, sun_path);
- sa.un.sun_family= AF_UNIX;
- memcpy(sa.un.sun_path, path_cli, pathlen);
-
- r= bind(cli_master, &sa.sa, sl);
- if (r) NOCLI("bind to cli socket path %s", sa.un.sun_path);
-
- r= listen(cli_master, 5);
- if (r) NOCLI("listen to cli master socket");
-
- xsetnonblock(cli_master, 1);
-
- loop->on_fd(loop, cli_master, OOP_READ, cli_master_readable, 0);
- info("cli ready, listening on %s", path_cli);
-
- return;
-
- nocli:
- xclose_perhaps(&cli_master, "cli master",0);
- return;
-}
-
-/*========== management of connections ==========*/
-
-static void reconnect_blocking_event(void) {
- until_connect= reconnect_delay_periods;
-}
-
-static void conn_closefd(Conn *conn, const char *msgprefix) {
- int r= close_perhaps(&conn->fd);
- if (r) info("C%d %serror closing socket: %s",
- conn->fd, msgprefix, strerror(errno));
-}
-
-static int conn_busy(Conn *conn) {
- return
- conn->waiting.count ||
- conn->priority.count ||
- conn->sent.count ||
- conn->xmitu;
-}
-
-static void conn_dispose(Conn *conn) {
- if (!conn) return;
- if (conn->rd) {
- oop_rd_cancel(conn->rd);
- oop_rd_delete_kill(conn->rd);
- conn->rd= 0;
- }
- if (conn->fd) {
- loop->cancel_fd(loop, conn->fd, OOP_WRITE);
- loop->cancel_fd(loop, conn->fd, OOP_EXCEPTION);
- }
- conn_closefd(conn,"");
- free(conn);
-}
-
-static void *conn_exception(oop_source *lp, int fd,
- oop_event ev, void *conn_v) {
- Conn *conn= conn_v;
- unsigned char ch;
- assert(fd == conn->fd);
- assert(ev == OOP_EXCEPTION);
- int r= read(conn->fd, &ch, 1);
- if (r<0) connfail(conn,"read failed: %s",strerror(errno));
- else connfail(conn,"exceptional condition on socket (peer sent urgent"
- " data? read(,&ch,1)=%d,ch='\\x%02x')",r,ch);
- return OOP_CONTINUE;
-}
-
-static void vconnfail(Conn *conn, const char *fmt, va_list al) {
- int requeue[art_MaxState];
- memset(requeue,0,sizeof(requeue));
-
- Article *art;
-
- while ((art= LIST_REMHEAD(conn->priority)))
- LIST_ADDTAIL(art->ipf->queue, art);
-
- while ((art= LIST_REMHEAD(conn->waiting)))
- LIST_ADDTAIL(art->ipf->queue, art);
-
- while ((art= LIST_REMHEAD(conn->sent))) {
- requeue[art->state]++;
- if (art->state==art_Unsolicited) art->state= art_Unchecked;
- LIST_ADDTAIL(art->ipf->queue,art);
- check_reading_pause_resume(art->ipf);
- }
-
- int i;
- XmitDetails *d;
- for (i=0, d=conn->xmitd; i<conn->xmitu; i++, d++)
- xmit_free(d);
-
- LIST_REMOVE(conns,conn);
-
- char *m= xvasprintf(fmt,al);
- warn("C%d (now %d) connection failed requeueing " RCI_TRIPLE_FMT_BASE ": %s",
- conn->fd, conns.count, RCI_TRIPLE_VALS_BASE(requeue, /*nothing*/), m);
- free(m);
-
- reconnect_blocking_event();
- conn_dispose(conn);
- check_assign_articles();
-}
-
-static void connfail(Conn *conn, const char *fmt, ...) {
- va_list al;
- va_start(al,fmt);
- vconnfail(conn,fmt,al);
- va_end(al);
-}
-
-static void conn_idle_close(Conn *conn, const char *why) {
- static const char quitcmd[]= "QUIT\r\n";
- int todo= sizeof(quitcmd)-1;
- const char *p= quitcmd;
- for (;;) {
- int r= write(conn->fd, p, todo);
- if (r<0) {
- if (isewouldblock(errno))
- connfail(conn, "blocked writing QUIT to idle connection");
- else
- connfail(conn, "failed to write QUIT to idle connection: %s",
- strerror(errno));
- break;
- }
- assert(r<=todo);
- todo -= r;
- if (!todo) {
- conn->quitting= why;
- conn->since_activity= 0;
- dbg("C%d is idle (%s), quitting", conn->fd, why);
- break;
- }
- }
-}
-
-/*
- * For our last connection, we also shut it down if we have had
- * less than K in the last L
- */
-static void check_idle_conns(void) {
- Conn *conn;
-
- int volthisperiod= lowvol_perperiod[lowvol_circptr];
- lowvol_circptr++;
- lowvol_circptr %= lowvol_periods;
- lowvol_total += volthisperiod;
- lowvol_total -= lowvol_perperiod[lowvol_circptr];
- lowvol_perperiod[lowvol_circptr]= 0;
-
- FOR_CONN(conn)
- conn->since_activity++;
-
- search_again:
- FOR_CONN(conn) {
- if (conn->since_activity <= need_activity_periods) continue;
-
- /* We need to shut this down */
- if (conn->quitting)
- connfail(conn,"timed out waiting for response to QUIT (%s)",
- conn->quitting);
- else if (conn->sent.count)
- connfail(conn,"timed out waiting for responses");
- else if (conn->waiting.count || conn->priority.count)
- connfail(conn,"BUG IN INNDUCT conn has queue but nothing sent");
- else if (conn->xmitu)
- connfail(conn,"peer has been sending responses"
- " before receiving our commands!");
- else
- conn_idle_close(conn, "no activity");
-
- goto search_again;
- }
-
- conn= LIST_HEAD(conns);
- if (!volthisperiod &&
- conns.count==1 &&
- lowvol_total < lowvol_thresh &&
- !conn_busy(conn))
- conn_idle_close(conn, "low volume");
-}
-
-/*---------- making new connections ----------*/
-
-static pid_t connecting_child;
-static int connecting_fdpass_sock;
-
-static void connect_attempt_discard(void) {
- if (connecting_child) {
- int status= xwaitpid(&connecting_child, "connect");
- if (!(WIFEXITED(status) ||
- (WIFSIGNALED(status) && WTERMSIG(status) == SIGKILL)))
- report_child_status("connect", status);
- }
- if (connecting_fdpass_sock) {
- cancel_fd_read_except(connecting_fdpass_sock);
- xclose_perhaps(&connecting_fdpass_sock, "connecting fdpass socket",0);
- }
-}
-
-#define PREP_DECL_MSG_CMSG(msg) \
- char msgbyte= 0; \
- struct iovec msgiov; \
- msgiov.iov_base= &msgbyte; \
- msgiov.iov_len= 1; \
- struct msghdr msg; \
- memset(&msg,0,sizeof(msg)); \
- char msg##cbuf[CMSG_SPACE(sizeof(int))]; \
- msg.msg_iov= &msgiov; \
- msg.msg_iovlen= 1; \
- msg.msg_control= msg##cbuf; \
- msg.msg_controllen= sizeof(msg##cbuf);
-
-static void *connchild_event(oop_source *lp, int fd, oop_event e, void *u) {
- Conn *conn= 0;
-
- assert(fd == connecting_fdpass_sock);
-
- PREP_DECL_MSG_CMSG(msg);
-
- ssize_t rs= recvmsg(fd, &msg, 0);
- if (rs<0) {
- if (isewouldblock(errno)) return OOP_CONTINUE;
- syswarn("failed to read socket from connecting child");
- goto x;
- }
-
- NEW(conn);
- LIST_INIT(conn->waiting);
- LIST_INIT(conn->priority);
- LIST_INIT(conn->sent);
-
- struct cmsghdr *h= 0;
- if (rs >= 0) h= CMSG_FIRSTHDR(&msg);
- if (!h) {
- int status= xwaitpid(&connecting_child, "connect child (broken)");
-
- if (WIFEXITED(status)) {
- if (WEXITSTATUS(status) != 0 &&
- WEXITSTATUS(status) != CONNCHILD_ESTATUS_STREAM &&
- WEXITSTATUS(status) != CONNCHILD_ESTATUS_NOSTREAM)
- /* child already reported the problem */;
- else {
- if (e == OOP_EXCEPTION)
- warn("connect: connection child exited code %d but"
- " unexpected exception on fdpass socket",
- WEXITSTATUS(status));
- else
- warn("connect: connection child exited code %d but"
- " no cmsg (rs=%d)",
- WEXITSTATUS(status), (int)rs);
- }
- } else if (WIFSIGNALED(status) && WTERMSIG(status) == SIGALRM) {
- warn("connect: connection attempt timed out");
- } else {
- report_child_status("connect", status);
- }
- goto x;
- }
-
-#define CHK(field, val) \
- if (h->cmsg_##field != val) { \
- crash("connect: child sent cmsg with cmsg_" #field "=%d, expected %d", \
- h->cmsg_##field, val); \
- goto x; \
- }
- CHK(level, SOL_SOCKET);
- CHK(type, SCM_RIGHTS);
- CHK(len, CMSG_LEN(sizeof(conn->fd)));
-#undef CHK
-
- if (CMSG_NXTHDR(&msg,h)) crash("connect: child sent many cmsgs");
-
- memcpy(&conn->fd, CMSG_DATA(h), sizeof(conn->fd));
-
- int status;
- pid_t got= waitpid(connecting_child, &status, 0);
- if (got==-1) syscrash("connect: real wait for child");
- assert(got == connecting_child);
- connecting_child= 0;
-
- if (!WIFEXITED(status)) { report_child_status("connect",status); goto x; }
- int es= WEXITSTATUS(status);
- switch (es) {
- case CONNCHILD_ESTATUS_STREAM: conn->stream= 1; break;
- case CONNCHILD_ESTATUS_NOSTREAM: conn->stream= 0; break;
- default:
- die("connect: child gave unexpected exit status %d", es);
- }
-
- /* Phew! */
- conn->max_queue= conn->stream ? max_queue_per_conn : 1;
-
- loop->on_fd(loop, conn->fd, OOP_EXCEPTION, conn_exception, conn);
- conn->rd= oop_rd_new_fd(loop,conn->fd, 0, 0); /* sets nonblocking, too */
- if (!conn->fd) crash("oop_rd_new_fd conn failed (fd=%d)",conn->fd);
- int r= oop_rd_read(conn->rd, &peer_rd_style, NNTP_STRLEN,
- &peer_rd_ok, conn,
- &peer_rd_err, conn);
- if (r) syscrash("oop_rd_read for peer (fd=%d)",conn->fd);
-
- LIST_ADDHEAD(conns, conn);
- notice("C%d (now %d) connected %s",
- conn->fd, conns.count, conn->stream ? "streaming" : "plain");
-
- connect_attempt_discard();
- check_assign_articles();
- return OOP_CONTINUE;
-
- x:
- conn_dispose(conn);
- connect_attempt_discard();
- reconnect_blocking_event();
- return OOP_CONTINUE;
-}
-
-static int allow_connect_start(void) {
- return conns.count < max_connections
- && !connecting_child
- && !until_connect;
-}
-
-static void connect_start(void) {
- assert(!connecting_child);
- assert(!connecting_fdpass_sock);
-
- info("starting connection attempt");
- int ok_until_connect= until_connect;
- reconnect_blocking_event();
-
- int socks[2];
- int r= socketpair(AF_UNIX, SOCK_STREAM, 0, socks);
- if (r) { syswarn("connect: cannot create socketpair for child"); return; }
-
- connecting_child= xfork("connection");
-
- if (!connecting_child) {
- FILE *cn_from, *cn_to;
- char buf[NNTP_STRLEN+100];
- int exitstatus= CONNCHILD_ESTATUS_NOSTREAM;
-
- xclose(socks[0], "(in child) parent's connection fdpass socket",0);
-
- alarm(connection_setup_timeout);
- if (NNTPconnect((char*)remote_host, port, &cn_from, &cn_to, buf) < 0) {
- int l= strlen(buf);
- int stripped=0;
- while (l>0) {
- unsigned char c= buf[l-1];
- if (!isspace(c)) break;
- if (c=='\n' || c=='\r') stripped=1;
- --l;
- }
- if (!buf[0]) {
- sysdie("connect: connection attempt failed");
- } else {
- buf[l]= 0;
- die("connect: %s: %s", stripped ? "rejected" : "failed",
- sanitise(buf,-1));
- }
- }
- if (NNTPsendpassword((char*)remote_host, cn_from, cn_to) < 0)
- sysdie("connect: authentication failed");
- if (try_stream) {
- if (fputs("MODE STREAM\r\n", cn_to)==EOF ||
- fflush(cn_to))
- sysdie("connect: could not send MODE STREAM");
- buf[sizeof(buf)-1]= 0;
- if (!fgets(buf, sizeof(buf)-1, cn_from)) {
- if (ferror(cn_from))
- sysdie("connect: could not read response to MODE STREAM");
- else
- die("connect: connection close in response to MODE STREAM");
- }
- int l= strlen(buf);
- assert(l>=1);
- if (buf[l-1]!='\n')
- die("connect: response to MODE STREAM is too long: %.100s...",
- sanitise(buf,-1));
- l--; if (l>0 && buf[l-1]=='\r') l--;
- buf[l]= 0;
- char *ep;
- int rcode= strtoul(buf,&ep,10);
- if (ep != &buf[3])
- die("connect: bad response to MODE STREAM: %.50s", sanitise(buf,-1));
-
- switch (rcode) {
- case 203:
- exitstatus= CONNCHILD_ESTATUS_STREAM;
- break;
- case 480:
- case 500:
- break;
- default:
- warn("connect: unexpected response to MODE STREAM: %.50s",
- sanitise(buf,-1));
- exitstatus= 2;
- break;
- }
- }
- int fd= fileno(cn_from);
-
- PREP_DECL_MSG_CMSG(msg);
- struct cmsghdr *cmsg= CMSG_FIRSTHDR(&msg);
- cmsg->cmsg_level= SOL_SOCKET;
- cmsg->cmsg_type= SCM_RIGHTS;
- cmsg->cmsg_len= CMSG_LEN(sizeof(fd));
- memcpy(CMSG_DATA(cmsg), &fd, sizeof(fd));
-
- msg.msg_controllen= cmsg->cmsg_len;
- r= sendmsg(socks[1], &msg, 0);
- if (r<0) syscrash("sendmsg failed for new connection");
- if (r!=1) crash("sendmsg for new connection gave wrong result %d",r);
-
- _exit(exitstatus);
- }
-
- xclose(socks[1], "connecting fdpass child's socket",0);
- connecting_fdpass_sock= socks[0];
- xsetnonblock(connecting_fdpass_sock, 1);
- on_fd_read_except(connecting_fdpass_sock, connchild_event);
-
- if (!conns.count)
- until_connect= ok_until_connect;
-}
-
-/*---------- assigning articles to conns, and transmitting ----------*/
-
-static Article *dequeue_from(int peek, InputFile *ipf) {
- if (!ipf) return 0;
- if (peek) return LIST_HEAD(ipf->queue);
-
- Article *art= LIST_REMHEAD(ipf->queue);
- if (!art) return 0;
- check_reading_pause_resume(ipf);
- return art;
-}
-
-static Article *dequeue(int peek) {
- Article *art;
- art= dequeue_from(peek, flushing_input_file); if (art) return art;
- art= dequeue_from(peek, backlog_input_file); if (art) return art;
- art= dequeue_from(peek, main_input_file); if (art) return art;
- return 0;
-}
-
-static void check_assign_articles(void) {
- for (;;) {
- if (!dequeue(1))
- break;
-
- Conn *walk, *use=0;
- int spare=0, inqueue=0;
-
- /* Find a connection to offer this article. We prefer a busy
- * connection to an idle one, provided it's not full. We take the
- * first (oldest) and since that's stable, it will mean we fill up
- * connections in order. That way if we have too many
- * connections, the spare ones will go away eventually.
- */
- FOR_CONN(walk) {
- if (walk->quitting) continue;
- inqueue= walk->sent.count + walk->priority.count
- + walk->waiting.count;
- spare= walk->max_queue - inqueue;
- assert(inqueue <= max_queue_per_conn);
- assert(spare >= 0);
- if (inqueue==0) /*idle*/ { if (!use) use= walk; }
- else if (spare>0) /*working*/ { use= walk; break; }
- }
- if (use) {
- if (!inqueue) use->since_activity= 0; /* reset idle counter */
- while (spare>0) {
- Article *art= dequeue(0);
- if (!art) break;
- LIST_ADDTAIL(use->waiting, art);
- lowvol_perperiod[lowvol_circptr]++;
- spare--;
- }
- conn_maybe_write(use);
- } else if (allow_connect_start()) {
- connect_start();
- break;
- } else {
- break;
- }
- }
-}
-
-static void *conn_writeable(oop_source *l, int fd, oop_event ev, void *u) {
- conn_maybe_write(u);
- return OOP_CONTINUE;
-}
-
-static void conn_maybe_write(Conn *conn) {
- for (;;) {
- conn_make_some_xmits(conn);
- if (!conn->xmitu) {
- loop->cancel_fd(loop, conn->fd, OOP_WRITE);
- conn->oopwriting= 0;
- return;
- }
-
- void *rp= conn_write_some_xmits(conn);
- if (rp==OOP_CONTINUE) {
- if (!conn->oopwriting) {
- loop->on_fd(loop, conn->fd, OOP_WRITE, conn_writeable, conn);
- conn->oopwriting= 1;
- }
- return;
- } else if (rp==OOP_HALT) {
- return;
- } else if (!rp) {
- /* transmitted everything */
- } else {
- abort();
- }
- }
-}
-
-/*---------- expiry, flow control and deferral ----------*/
-
-/*
- * flow control notes
- * to ensure articles go away eventually
- * separate queue for each input file
- * queue expiry
- * every period, check head of backlog queue for expiry with SMretrieve
- * if too old: discard, and check next article
- * also check every backlog article as we read it
- * flush expiry
- * after too long in SEPARATED/DROPPING ie Separated/Finishing/Dropping
- * one-off: eat queued articles from flushing and write them to defer
- * one-off: connfail all connections which have any articles from flushing
- * newly read articles from flushing go straight to defer
- * this should take care of it and get us out of this state
- * to avoid filling up ram needlessly
- * input control
- * limit number of queued articles for each ipf
- * pause/resume inputfile tailing
- */
-
-static void check_reading_pause_resume(InputFile *ipf) {
- if (ipf->queue.count >= max_queue_per_ipf)
- inputfile_reading_pause(ipf);
- else
- inputfile_reading_resume(ipf);
-}
-
-static void article_defer(Article *art /* not on a queue */, int whichcount) {
- open_defer();
- if (fprintf(defer, "%s %s\n", TokenToText(art->token), art->messageid) <0
- || fflush(defer))
- sysdie("write to defer file %s",path_defer);
- article_done(art, whichcount);
-}
-
-static int article_check_expired(Article *art /* must be queued, not conn */) {
- ARTHANDLE *artdata= SMretrieve(art->token, RETR_STAT);
- if (artdata) { SMfreearticle(artdata); return 0; }
-
- LIST_REMOVE(art->ipf->queue, art);
- art->missing= 1;
- art->ipf->count_nooffer_missing++;
- article_done(art,-1);
- return 1;
-}
-
-static void inputfile_queue_check_expired(InputFile *ipf) {
- if (!ipf) return;
-
- for (;;) {
- Article *art= LIST_HEAD(ipf->queue);
- int expd= article_check_expired(art);
- if (!expd) break;
- }
- check_reading_pause_resume(ipf);
-}
-
-static void article_autodefer(InputFile *ipf, Article *art) {
- ipf->autodefer++;
- article_defer(art,-1);
-}
-
-static int has_article_in(const ArticleList *al, InputFile *ipf) {
- Article *art;
- for (art=LIST_HEAD(*al); art; art=LIST_NEXT(art))
- if (art->ipf == ipf) return 1;
- return 0;
-}
-
-static void autodefer_input_file_articles(InputFile *ipf) {
- Article *art;
- while ((art= LIST_REMHEAD(ipf->queue)))
- article_autodefer(ipf, art);
-}
-
-static void autodefer_input_file(InputFile *ipf) {
- static const char *const abandon= "stuck";
- ipf->autodefer= 0;
-
- autodefer_input_file_articles(ipf);
-
- if (ipf->inprogress) {
- Conn *walk;
- FOR_CONN(walk) {
- if (has_article_in(&walk->waiting, ipf) ||
- has_article_in(&walk->priority, ipf) ||
- has_article_in(&walk->sent, ipf))
- walk->quitting= abandon;
- }
- while (ipf->inprogress) {
- FOR_CONN(walk)
- if (walk->quitting == abandon) goto found;
- abort(); /* where are they ?? */
-
- found:
- connfail(walk, "connection is stuck or crawling,"
- " and we need to finish flush");
- autodefer_input_file_articles(ipf);
- }
- }
-
- check_reading_pause_resume(ipf);
-}
-
-/*========== article transmission ==========*/
-
-static XmitDetails *xmit_core(Conn *conn, const char *data, int len,
- XmitKind kind) { /* caller must then fill in details */
- struct iovec *v= &conn->xmit[conn->xmitu];
- XmitDetails *d= &conn->xmitd[conn->xmitu++];
- v->iov_base= (char*)data;
- v->iov_len= len;
- d->kind= kind;
- return d;
-}
-
-static void xmit_noalloc(Conn *conn, const char *data, int len) {
- xmit_core(conn,data,len, xk_Const);
-}
-#define XMIT_LITERAL(lit) (xmit_noalloc(conn, (lit), sizeof(lit)-1))
-
-static void xmit_artbody(Conn *conn, ARTHANDLE *ah /* consumed */) {
- XmitDetails *d= xmit_core(conn, ah->data, ah->len, xk_Artdata);
- d->info.sm_art= ah;
-}
-
-static void xmit_free(XmitDetails *d) {
- switch (d->kind) {
- case xk_Artdata: SMfreearticle(d->info.sm_art); break;
- case xk_Const: break;
- default: abort();
- }
-}
-
-static void *conn_write_some_xmits(Conn *conn) {
- /* return values:
- * 0: nothing more to write, no need to call us again
- * OOP_CONTINUE: more to write but fd not writeable
- * OOP_HALT: disaster, have destroyed conn
- */
- for (;;) {
- int count= conn->xmitu;
- if (!count) return 0;
-
- if (count > IOV_MAX) count= IOV_MAX;
- ssize_t rs= writev(conn->fd, conn->xmit, count);
- if (rs < 0) {
- if (isewouldblock(errno)) return OOP_CONTINUE;
- connfail(conn, "write failed: %s", strerror(errno));
- return OOP_HALT;
- }
- assert(rs > 0);
-
- int done;
- for (done=0; rs; ) {
- assert(done<conn->xmitu);
- struct iovec *vp= &conn->xmit[done];
- XmitDetails *dp= &conn->xmitd[done];
- assert(vp->iov_len <= SSIZE_MAX);
- if ((size_t)rs >= vp->iov_len) {
- rs -= vp->iov_len;
- xmit_free(dp); /* vp->iov_len -= vp->iov_len, etc. */
- done++;
- } else {
- vp->iov_base= (char*)vp->iov_base + rs;
- vp->iov_len -= rs;
- break; /* rs -= rs */
- }
- }
- int newu= conn->xmitu - done;
- memmove(conn->xmit, conn->xmit + done, newu * sizeof(*conn->xmit));
- memmove(conn->xmitd, conn->xmitd + done, newu * sizeof(*conn->xmitd));
- conn->xmitu= newu;
- }
-}
-
-static void conn_make_some_xmits(Conn *conn) {
- for (;;) {
- if (conn->xmitu+5 > CONNIOVS)
- break;
-
- Article *art= LIST_REMHEAD(conn->priority);
- if (!art) art= LIST_REMHEAD(conn->waiting);
- if (!art) break;
-
- if (art->state >= art_Wanted || (conn->stream && nocheck)) {
- /* actually send it */
-
- ARTHANDLE *artdata= SMretrieve(art->token, RETR_ALL);
-
- art->state=
- art->state == art_Unchecked ? art_Unsolicited :
- art->state == art_Wanted ? art_Wanted :
- (abort(),-1);
-
- if (!artdata) art->missing= 1;
- art->ipf->counts[art->state][ artdata ? RC_sent : RC_missing ]++;
-
- if (conn->stream) {
- if (artdata) {
- XMIT_LITERAL("TAKETHIS ");
- xmit_noalloc(conn, art->messageid, art->midlen);
- XMIT_LITERAL("\r\n");
- xmit_artbody(conn, artdata);
- } else {
- article_done(art, -1);
- continue;
- }
- } else {
- /* we got 235 from IHAVE */
- if (artdata) {
- xmit_artbody(conn, artdata);
- } else {
- XMIT_LITERAL(".\r\n");
- }
- }
-
- LIST_ADDTAIL(conn->sent, art);
-
- } else {
- /* check it */
-
- if (conn->stream)
- XMIT_LITERAL("CHECK ");
- else
- XMIT_LITERAL("IHAVE ");
- xmit_noalloc(conn, art->messageid, art->midlen);
- XMIT_LITERAL("\r\n");
-
- assert(art->state == art_Unchecked);
- art->ipf->counts[art->state][RC_sent]++;
- LIST_ADDTAIL(conn->sent, art);
- }
- }
-}
-
-/*========== handling responses from peer ==========*/
-
-static const oop_rd_style peer_rd_style= {
- OOP_RD_DELIM_STRIP, '\n',
- OOP_RD_NUL_FORBID,
- OOP_RD_SHORTREC_FORBID
-};
-
-static void *peer_rd_err(oop_source *lp, oop_read *oread, oop_rd_event ev,
- const char *errmsg, int errnoval,
- const char *data, size_t recsz, void *conn_v) {
- Conn *conn= conn_v;
- connfail(conn, "error receiving from peer: %s", errmsg);
- return OOP_CONTINUE;
-}
-
-static Article *article_reply_check(Conn *conn, const char *response,
- int code_indicates_streaming,
- int must_have_sent
- /* 1:yes, -1:no, 0:dontcare */,
- const char *sanitised_response) {
- Article *art= LIST_HEAD(conn->sent);
-
- if (!art) {
- connfail(conn,
- "peer gave unexpected response when no commands outstanding: %s",
- sanitised_response);
- return 0;
- }
-
- if (code_indicates_streaming) {
- assert(!memchr(response, 0, 4)); /* ensured by peer_rd_ok */
- if (!conn->stream) {
- connfail(conn, "peer gave streaming response code "
- " to IHAVE or subsequent body: %s", sanitised_response);
- return 0;
- }
- const char *got_mid= response+4;
- int got_midlen= strcspn(got_mid, " \n\r");
- if (got_midlen<3 || got_mid[0]!='<' || got_mid[got_midlen-1]!='>') {
- connfail(conn, "peer gave streaming response with syntactically invalid"
- " messageid: %s", sanitised_response);
- return 0;
- }
- if (got_midlen != art->midlen ||
- memcmp(got_mid, art->messageid, got_midlen)) {
- connfail(conn, "peer gave streaming response code to wrong article -"
- " probable synchronisation problem; we offered: %s;"
- " peer said: %s",
- art->messageid, sanitised_response);
- return 0;
- }
- } else {
- if (conn->stream) {
- connfail(conn, "peer gave non-streaming response code to"
- " CHECK/TAKETHIS: %s", sanitised_response);
- return 0;
- }
- }
-
- if (must_have_sent>0 && art->state < art_Wanted) {
- connfail(conn, "peer says article accepted but"
- " we had not sent the body: %s", sanitised_response);
- return 0;
- }
- if (must_have_sent<0 && art->state >= art_Wanted) {
- connfail(conn, "peer says please sent the article but we just did: %s",
- sanitised_response);
- return 0;
- }
-
- Article *art_again= LIST_REMHEAD(conn->sent);
- assert(art_again == art);
- return art;
-}
-
-static void update_nocheck(int accepted) {
- accept_proportion *= nocheck_decay;
- accept_proportion += accepted * (1.0 - nocheck_decay);
- int new_nocheck= accept_proportion >= nocheck_thresh;
- if (new_nocheck && !nocheck_reported) {
- notice("entering nocheck mode for the first time");
- nocheck_reported= 1;
- } else if (new_nocheck != nocheck) {
- dbg("nocheck mode %s", new_nocheck ? "start" : "stop");
- }
- nocheck= new_nocheck;
-}
-
-static void article_done(Article *art, int whichcount) {
- if (whichcount>=0 && !art->missing)
- art->ipf->counts[art->state][whichcount]++;
-
- if (whichcount == RC_accepted) update_nocheck(1);
- else if (whichcount == RC_unwanted) update_nocheck(0);
-
- InputFile *ipf= art->ipf;
-
- while (art->blanklen) {
- static const char spaces[]=
- " "
- " "
- " "
- " "
- " "
- " "
- " "
- " "
- " ";
- int nspaces= sizeof(spaces)-1;
- int w= art->blanklen; if (w > nspaces) w= nspaces;
- int r= pwrite(ipf->fd, spaces, w, art->offset);
- if (r==-1) {
- if (errno==EINTR) continue;
- syscrash("failed to blank entry for %s (length %d at offset %lu) in %s",
- art->messageid, art->blanklen,
- (unsigned long)art->offset, ipf->path);
- }
- assert(r>=0 && r<=w);
- art->blanklen -= w;
- art->offset += w;
- }
-
- ipf->inprogress--;
- assert(ipf->inprogress >= 0);
- free(art);
-
- if (!ipf->inprogress && ipf != main_input_file)
- queue_check_input_done();
-}
-
-static void *peer_rd_ok(oop_source *lp, oop_read *oread, oop_rd_event ev,
- const char *errmsg, int errnoval,
- const char *data, size_t recsz, void *conn_v) {
- Conn *conn= conn_v;
-
- if (ev == OOP_RD_EOF) {
- connfail(conn, "unexpected EOF from peer");
- return OOP_CONTINUE;
- }
- assert(ev == OOP_RD_OK);
-
- char *sani= sanitise(data,-1);
-
- char *ep;
- unsigned long code= strtoul(data, &ep, 10);
- if (ep != data+3 || *ep != ' ' || data[0]=='0') {
- connfail(conn, "badly formatted response from peer: %s", sani);
- return OOP_CONTINUE;
- }
-
- int busy= conn_busy(conn);
-
- if (conn->quitting) {
- if (code!=205 && code!=400) {
- connfail(conn, "peer gave unexpected response to QUIT (%s): %s",
- conn->quitting, sani);
- } else {
- LIST_REMOVE(conns,conn);
- notice("C%d (now %d) idle connection closed (%s)",
- conn->fd, conns.count, conn->quitting);
- assert(!busy);
- conn_dispose(conn);
- }
- return OOP_CONTINUE;
- }
-
- conn->since_activity= 0;
- Article *art;
-
-#define GET_ARTICLE(musthavesent) do{ \
- art= article_reply_check(conn, data, code_streaming, musthavesent, sani); \
- if (!art) return OOP_CONTINUE; /* reply_check has failed the conn */ \
- }while(0)
-
-#define ARTICLE_DEALTWITH(streaming,musthavesent,how) do{ \
- code_streaming= (streaming); \
- GET_ARTICLE(musthavesent); \
- article_done(art, RC_##how); \
- goto dealtwith; \
- }while(0)
-
-#define PEERBADMSG(m) do { \
- connfail(conn, m ": %s", sani); return OOP_CONTINUE; \
- }while(0)
-
- int code_streaming= 0;
-
- switch (code) {
-
- default: PEERBADMSG("peer sent unexpected message");
-
- case 400:
- if (busy)
- PEERBADMSG("peer timed us out or stopped accepting articles");
-
- LIST_REMOVE(conns,conn);
- notice("C%d (now %d) idle connection closed by peer",
- conns.count, conn->fd);
- conn_dispose(conn);
- return OOP_CONTINUE;
-
- case 435: ARTICLE_DEALTWITH(0,0,unwanted); /* IHAVE says they have it */
- case 438: ARTICLE_DEALTWITH(1,0,unwanted); /* CHECK/TAKETHIS: they have it */
-
- case 235: ARTICLE_DEALTWITH(0,1,accepted); /* IHAVE says thanks */
- case 239: ARTICLE_DEALTWITH(1,1,accepted); /* TAKETHIS says thanks */
-
- case 437: ARTICLE_DEALTWITH(0,0,rejected); /* IHAVE says rejected */
- case 439: ARTICLE_DEALTWITH(1,0,rejected); /* TAKETHIS says rejected */
-
- case 238: /* CHECK says send it */
- code_streaming= 1;
- case 335: /* IHAVE says send it */
- GET_ARTICLE(-1);
- assert(art->state == art_Unchecked);
- art->ipf->counts[art->state][RC_accepted]++;
- art->state= art_Wanted;
- LIST_ADDTAIL(conn->priority, art);
- break;
-
- case 431: /* CHECK or TAKETHIS says try later */
- code_streaming= 1;
- case 436: /* IHAVE says try later */
- GET_ARTICLE(0);
- article_defer(art, RC_deferred);
- break;
-
- }
-dealtwith:
-
- conn_maybe_write(conn);
- check_assign_articles();
- return OOP_CONTINUE;
-}
-
-
-/*========== monitoring of input files ==========*/
-
-static void feedfile_eof(InputFile *ipf) {
- assert(ipf != main_input_file); /* promised by tailing_try_read */
- inputfile_reading_stop(ipf);
-
- if (ipf == flushing_input_file) {
- assert(sms==sm_SEPARATED || sms==sm_DROPPING);
- if (main_input_file) inputfile_reading_start(main_input_file);
- statemc_check_flushing_done();
- } else if (ipf == backlog_input_file) {
- statemc_check_backlog_done();
- } else {
- abort(); /* supposed to wait rather than get EOF on main input file */
- }
-}
-
-static InputFile *open_input_file(const char *path) {
- int fd= open(path, O_RDWR);
- if (fd<0) {
- if (errno==ENOENT) return 0;
- sysdie("unable to open input file %s", path);
- }
- assert(fd>0);
-
- InputFile *ipf= xmalloc(sizeof(*ipf) + strlen(path) + 1);
- memset(ipf,0,sizeof(*ipf));
-
- ipf->fd= fd;
- ipf->autodefer= -1;
- LIST_INIT(ipf->queue);
- strcpy(ipf->path, path);
-
- return ipf;
-}
-
-static void close_input_file(InputFile *ipf) { /* does not free */
- assert(!ipf->readable_callback); /* must have had ->on_cancel */
- assert(!ipf->filemon); /* must have had inputfile_reading_stop */
- assert(!ipf->rd); /* must have had inputfile_reading_stop */
- assert(!ipf->inprogress); /* no dangling pointers pointing here */
- xclose_perhaps(&ipf->fd, "input file ", ipf->path);
-}
-
-
-/*---------- dealing with articles read in the input file ----------*/
-
-static void *feedfile_got_bad_data(InputFile *ipf, off_t offset,
- const char *data, const char *how) {
- warn("corrupted file: %s, offset %lu: %s: in %s",
- ipf->path, (unsigned long)offset, how, sanitise(data,-1));
- ipf->readcount_err++;
- if (ipf->readcount_err > max_bad_data_initial +
- (ipf->readcount_ok+ipf->readcount_blank) / max_bad_data_ratio)
- crash("too much garbage in input file! (%d errs, %d ok, %d blank)",
- ipf->readcount_err, ipf->readcount_ok, ipf->readcount_blank);
- return OOP_CONTINUE;
-}
-
-static void *feedfile_read_err(oop_source *lp, oop_read *rd,
- oop_rd_event ev, const char *errmsg,
- int errnoval, const char *data, size_t recsz,
- void *ipf_v) {
- InputFile *ipf= ipf_v;
- assert(ev == OOP_RD_SYSTEM);
- errno= errnoval;
- syscrash("error reading input file: %s, offset %lu",
- ipf->path, (unsigned long)ipf->offset);
-}
-
-static void *feedfile_got_article(oop_source *lp, oop_read *rd,
- oop_rd_event ev, const char *errmsg,
- int errnoval, const char *data, size_t recsz,
- void *ipf_v) {
- InputFile *ipf= ipf_v;
- Article *art;
- char tokentextbuf[sizeof(TOKEN)*2+3];
-
- if (!data) { feedfile_eof(ipf); return OOP_CONTINUE; }
-
- off_t old_offset= ipf->offset;
- ipf->offset += recsz + !!(ev == OOP_RD_OK);
-
-#define X_BAD_DATA(m) return feedfile_got_bad_data(ipf,old_offset,data,m);
-
- if (ev==OOP_RD_PARTREC)
- feedfile_got_bad_data(ipf,old_offset,data,"missing final newline");
- /* but process it anyway */
-
- if (ipf->skippinglong) {
- if (ev==OOP_RD_OK) ipf->skippinglong= 0; /* fine now */
- return OOP_CONTINUE;
- }
- if (ev==OOP_RD_LONG) {
- ipf->skippinglong= 1;
- X_BAD_DATA("overly long line");
- }
-
- if (memchr(data,'\0',recsz)) X_BAD_DATA("nul byte");
- if (!recsz) X_BAD_DATA("empty line");
-
- if (data[0]==' ') {
- if (strspn(data," ") != recsz) X_BAD_DATA("line partially blanked");
- ipf->readcount_blank++;
- return OOP_CONTINUE;
- }
-
- char *space= strchr(data,' ');
- int tokenlen= space-data;
- int midlen= (int)recsz-tokenlen-1;
- if (midlen <= 2) X_BAD_DATA("no room for messageid");
- if (space[1]!='<' || space[midlen]!='>') X_BAD_DATA("invalid messageid");
-
- if (tokenlen != sizeof(TOKEN)*2+2) X_BAD_DATA("token wrong length");
- memcpy(tokentextbuf, data, tokenlen);
- tokentextbuf[tokenlen]= 0;
- if (!IsToken(tokentextbuf)) X_BAD_DATA("token wrong syntax");
-
- ipf->readcount_ok++;
-
- art= xmalloc(sizeof(*art) - 1 + midlen + 1);
- memset(art,0,sizeof(*art));
- art->state= art_Unchecked;
- art->midlen= midlen;
- art->ipf= ipf; ipf->inprogress++;
- art->token= TextToToken(tokentextbuf);
- art->offset= old_offset;
- art->blanklen= recsz;
- strcpy(art->messageid, space+1);
-
- if (ipf->autodefer >= 0) {
- article_autodefer(ipf, art);
- } else {
- LIST_ADDTAIL(ipf->queue, art);
-
- if (ipf==backlog_input_file)
- article_check_expired(art);
- }
-
- if (sms==sm_NORMAL && ipf==main_input_file &&
- ipf->offset >= target_max_feedfile_size)
- statemc_start_flush("feed file size");
-
- check_assign_articles(); /* may destroy conn but that's OK */
- check_reading_pause_resume(ipf);
- return OOP_CONTINUE;
-}
-
-/*========== tailing input file ==========*/
-
-static void *tailing_rable_call_time(oop_source *lp, struct timeval tv,
- void *user) {
- /* lifetime of ipf here is OK because destruction will cause
- * on_cancel which will cancel this callback */
- InputFile *ipf= user;
-
- dbg("**TRACT** ipf=%p called",ipf);
- if (!ipf->fake_readable) return OOP_CONTINUE;
-
- /* we just keep calling readable until our caller (oop_rd)
- * has called try_read, and try_read has found EOF so given EAGAIN */
- dbg("**TRACT** ipf=%p reschedule",ipf);
- loop->on_time(loop, OOP_TIME_NOW, tailing_rable_call_time, ipf);
-
- return ipf->readable_callback(loop, &ipf->readable,
- ipf->readable_callback_user);
-}
-
-static void tailing_on_cancel(struct oop_readable *rable) {
- InputFile *ipf= (void*)rable;
- dbg("**TOR** ipf=%p on_cancel",ipf);
-
- if (ipf->filemon) filemon_stop(ipf);
- dbg("**TRACT** ipf=%p cancel",ipf);
- loop->cancel_time(loop, OOP_TIME_NOW, tailing_rable_call_time, ipf);
- ipf->readable_callback= 0;
-}
-
-static void tailing_make_readable(InputFile *ipf) {
- dbg("**TRACT** ipf=%p makereadable rcb=%p",ipf,
- (void*)ipf?ipf->readable_callback:0);
- if (!ipf || !ipf->readable_callback) /* so callers can be naive */
- return;
- ipf->fake_readable= 1;
- loop->on_time(loop, OOP_TIME_NOW, tailing_rable_call_time, ipf);
-}
-
-static int tailing_on_readable(struct oop_readable *rable,
- oop_readable_call *cb, void *user) {
- InputFile *ipf= (void*)rable;
- dbg("**TOR** ipf=%p on_readable",ipf);
-
- tailing_on_cancel(rable);
- ipf->readable_callback= cb;
- ipf->readable_callback_user= user;
- filemon_start(ipf);
- tailing_make_readable(ipf);
- return 0;
-}
-
-static ssize_t tailing_try_read(struct oop_readable *rable, void *buffer,
- size_t length) {
- InputFile *ipf= (void*)rable;
- for (;;) {
- ssize_t r= read(ipf->fd, buffer, length);
- if (r==-1) {
- if (errno==EINTR) continue;
- ipf->fake_readable= 0;
- return r;
- }
- if (!r) {
- if (ipf==main_input_file) {
- errno=EAGAIN;
- ipf->fake_readable= 0;
- return -1;
- } else if (ipf==flushing_input_file) {
- assert(ipf->rd);
- assert(sms==sm_SEPARATED || sms==sm_DROPPING);
- } else if (ipf==backlog_input_file) {
- assert(ipf->rd);
- } else {
- abort();
- }
- }
- dbg("**TOR** ipf=%p try_read r=%d",ipf,r);
- return r;
- }
-}
-
-/*---------- filemon implemented with inotify ----------*/
-
-#if defined(HAVE_SYS_INOTIFY_H) && !defined(HAVE_FILEMON)
-#define HAVE_FILEMON
-
-#include <sys/inotify.h>
-
-static int filemon_inotify_fd;
-static int filemon_inotify_wdmax;
-static InputFile **filemon_inotify_wd2ipf;
-
-struct Filemon_Perfile {
- int wd;
-};
-
-static void filemon_method_startfile(InputFile *ipf, Filemon_Perfile *pf) {
- int wd= inotify_add_watch(filemon_inotify_fd, ipf->path, IN_MODIFY);
- if (wd < 0) sysdie("inotify_add_watch %s", ipf->path);
-
- if (wd >= filemon_inotify_wdmax) {
- int newmax= wd+2;
- filemon_inotify_wd2ipf= xrealloc(filemon_inotify_wd2ipf,
- sizeof(*filemon_inotify_wd2ipf) * newmax);
- memset(filemon_inotify_wd2ipf + filemon_inotify_wdmax, 0,
- sizeof(*filemon_inotify_wd2ipf) * (newmax - filemon_inotify_wdmax));
- filemon_inotify_wdmax= newmax;
- }
-
- assert(!filemon_inotify_wd2ipf[wd]);
- filemon_inotify_wd2ipf[wd]= ipf;
-
- dbg("filemon inotify startfile %p wd=%d wdmax=%d",
- ipf, wd, filemon_inotify_wdmax);
-
- pf->wd= wd;
-}
-
-static void filemon_method_stopfile(InputFile *ipf, Filemon_Perfile *pf) {
- int wd= pf->wd;
- dbg("filemon inotify stopfile %p wd=%d", ipf, wd);
- int r= inotify_rm_watch(filemon_inotify_fd, wd);
- if (r) syscrash("inotify_rm_watch");
- filemon_inotify_wd2ipf[wd]= 0;
-}
-
-static void *filemon_inotify_readable(oop_source *lp, int fd,
- oop_event e, void *u) {
- struct inotify_event iev;
- for (;;) {
- int r= read(filemon_inotify_fd, &iev, sizeof(iev));
- if (r==-1) {
- if (isewouldblock(errno)) break;
- syscrash("read from inotify master");
- } else if (r==sizeof(iev)) {
- assert(iev.wd >= 0 && iev.wd < filemon_inotify_wdmax);
- } else {
- crash("inotify read %d bytes wanted struct of %d", r, (int)sizeof(iev));
- }
- InputFile *ipf= filemon_inotify_wd2ipf[iev.wd];
- /*dbg("filemon inotify readable read %p wd=%d", ipf, iev.wd);*/
- tailing_make_readable(ipf);
- }
- return OOP_CONTINUE;
-}
-
-static int filemon_method_init(void) {
- filemon_inotify_fd= inotify_init();
- if (filemon_inotify_fd<0) {
- syswarn("filemon/inotify: inotify_init failed");
- return 0;
- }
- xsetnonblock(filemon_inotify_fd, 1);
- loop->on_fd(loop, filemon_inotify_fd, OOP_READ, filemon_inotify_readable, 0);
-
- dbg("filemon inotify init filemon_inotify_fd=%d", filemon_inotify_fd);
- return 1;
-}
-
-static void filemon_method_dump_info(FILE *f) {
- int i;
- fprintf(f,"inotify");
- DUMPV("%d",,filemon_inotify_fd);
- DUMPV("%d",,filemon_inotify_wdmax);
- for (i=0; i<filemon_inotify_wdmax; i++)
- fprintf(f," wd2ipf[%d]=%p\n", i, filemon_inotify_wd2ipf[i]);
-}
-
-#endif /* HAVE_INOTIFY && !HAVE_FILEMON */
-
-/*---------- filemon dummy implementation ----------*/
-
-#if !defined(HAVE_FILEMON)
-
-struct Filemon_Perfile { int dummy; };
-
-static int filemon_method_init(void) {
- warn("filemon/dummy: no filemon method compiled in");
- return 0;
-}
-static void filemon_method_startfile(InputFile *ipf, Filemon_Perfile *pf) { }
-static void filemon_method_stopfile(InputFile *ipf, Filemon_Perfile *pf) { }
-static void filemon_method_dump_info(FILE *f) { fprintf(f,"dummy\n"); }
-
-#endif /* !HAVE_FILEMON */
-
-/*---------- filemon generic interface ----------*/
-
-static void filemon_start(InputFile *ipf) {
- assert(!ipf->filemon);
-
- NEW(ipf->filemon);
- filemon_method_startfile(ipf, ipf->filemon);
-}
-
-static void filemon_stop(InputFile *ipf) {
- if (!ipf->filemon) return;
- filemon_method_stopfile(ipf, ipf->filemon);
- free(ipf->filemon);
- ipf->filemon= 0;
-}
-
-/*---------- interface to start and stop an input file ----------*/
+#include "innduct.h"
-static const oop_rd_style feedfile_rdstyle= {
- OOP_RD_DELIM_STRIP, '\n',
- OOP_RD_NUL_PERMIT,
- OOP_RD_SHORTREC_LONG,
+const char *sms_names[]= {
+#define SMS_DEF_NAME(s) #s ,
+ SMS_LIST(SMS_DEF_NAME)
+ 0
};
-static void inputfile_reading_resume(InputFile *ipf) {
- if (!ipf->rd) return;
- if (!ipf->paused) return;
-
- int r= oop_rd_read(ipf->rd, &feedfile_rdstyle, MAX_LINE_FEEDFILE,
- feedfile_got_article,ipf, feedfile_read_err, ipf);
- if (r) syscrash("unable start reading feedfile %s",ipf->path);
-
- ipf->paused= 0;
-}
-
-static void inputfile_reading_pause(InputFile *ipf) {
- if (!ipf->rd) return;
- if (ipf->paused) return;
- oop_rd_cancel(ipf->rd);
- ipf->paused= 1;
-}
-
-static void inputfile_reading_start(InputFile *ipf) {
- assert(!ipf->rd);
- ipf->readable.on_readable= tailing_on_readable;
- ipf->readable.on_cancel= tailing_on_cancel;
- ipf->readable.try_read= tailing_try_read;
- ipf->readable.delete_tidy= 0; /* we never call oop_rd_delete_{tidy,kill} */
- ipf->readable.delete_kill= 0;
-
- ipf->readable_callback= 0;
- ipf->readable_callback_user= 0;
-
- ipf->rd= oop_rd_new(loop, &ipf->readable, 0,0);
- assert(ipf->rd);
-
- ipf->paused= 1;
- inputfile_reading_resume(ipf);
-}
-
-static void inputfile_reading_stop(InputFile *ipf) {
- assert(ipf->rd);
- inputfile_reading_pause(ipf);
- oop_rd_delete(ipf->rd);
- ipf->rd= 0;
- assert(!ipf->filemon); /* we shouldn't be monitoring it now */
-}
-
-
-/*========== interaction with innd - state machine ==========*/
-
-/* See official state diagram at top of file. We implement
- * this as follows:
- * -8<-
-
- .=======.
- ||START||
- `======='
- |
- | open F
- |
- | F ENOENT
- |`---------------------------------------------------.
- F OPEN OK | |
- |`---------------- - - - |
- D ENOENT | D EXISTS see OVERALL STATES diagram |
- | for full startup logic |
- ,--------->| |
- | V |
- | ============ try to |
- | NORMAL open D |
- | [Normal] |
- | main F tail |
- | ============ V
- | | |
- | | F IS SO BIG WE SHOULD FLUSH, OR TIMEOUT |
- ^ | hardlink F to D |
- | [Hardlinked] |
- | | unlink F |
- | | our handle onto F is now onto D |
- | [Moved] |
- | | |
- | |<-------------------<---------------------<---------+
- | | |
- | | spawn inndcomm flush |
- | V |
- | ================== |
- | FLUSHING[-ABSENT] |
- | [Flushing] |
- | main D tail/none |
- | ================== |
- | | |
- | | INNDCOMM FLUSH FAILS ^
- | |`----------------------->----------. |
- | | | |
- | | NO SUCH SITE V |
- ^ |`--------------->----. ==================== |
- | | \ FLUSHFAILED[-ABSENT] |
- | | \ [Moved] |
- | | FLUSH OK \ main D tail/none |
- | | open F \ ==================== |
- | | \ | |
- | | \ | TIME TO RETRY |
- | |`------->----. ,---<---'\ `----------------'
- | | D NONE | | D NONE `----.
- | V | | V
- | ============= V V ============
- | SEPARATED-1 | | DROPPING-1
- | flsh->rd!=0 | | flsh->rd!=0
- | [Separated] | | [Dropping]
- | main F idle | | main none
- | flsh D tail | | flsh D tail
- | ============= | | ============
- | | | | install |
- ^ | EOF ON D | | defer | EOF ON D
- | V | | V
- | =============== | | ===============
- | SEPARATED-2 | | DROPPING-2
- | flsh->rd==0 | V flsh->rd==0
- | [Finishing] | | [Dropping]
- | main F tail | `. main none
- | flsh D closed | `. flsh D closed
- | =============== V `. ===============
- | | `. |
- | | ALL D PROCESSED `. | ALL D PROCESSED
- | V install defer as backlog `. | install defer
- ^ | close D `. | close D
- | | unlink D `. | unlink D
- | | | |
- | | V V
- `----------' ==============
- DROPPED
- [Dropped]
- main none
- flsh none
- some backlog
- ==============
- |
- | ALL BACKLOG DONE
- |
- | unlink lock
- | exit
- V
- ==========
- (ESRCH)
- [Droppped]
- ==========
- * ->8-
- */
-
-static void startup_set_input_file(InputFile *f) {
- assert(!main_input_file);
- main_input_file= f;
- inputfile_reading_start(f);
-}
-
-static void statemc_lock(void) {
- int lockfd;
- struct stat stab, stabf;
-
- for (;;) {
- lockfd= open(path_lock, O_CREAT|O_RDWR, 0600);
- if (lockfd<0) sysdie("open lockfile %s", path_lock);
-
- struct flock fl;
- memset(&fl,0,sizeof(fl));
- fl.l_type= F_WRLCK;
- fl.l_whence= SEEK_SET;
- int r= fcntl(lockfd, F_SETLK, &fl);
- if (r==-1) {
- if (errno==EACCES || isewouldblock(errno)) {
- if (quiet_multiple) exit(0);
- die("another duct holds the lockfile");
- }
- sysdie("fcntl F_SETLK lockfile %s", path_lock);
- }
-
- xfstat_isreg(lockfd, &stabf, path_lock, "lockfile");
- int lock_noent;
- xlstat_isreg(path_lock, &stab, &lock_noent, "lockfile");
-
- if (!lock_noent && samefile(&stab, &stabf))
- break;
-
- xclose(lockfd, "stale lockfile ", path_lock);
- }
-
- FILE *lockfile= fdopen(lockfd, "w");
- if (!lockfile) syscrash("fdopen lockfile");
-
- int r= ftruncate(lockfd, 0);
- if (r) syscrash("truncate lockfile to write new info");
-
- if (fprintf(lockfile, "pid %ld\nsite %s\nfeedfile %s\nfqdn %s\n",
- (unsigned long)self_pid,
- sitename, feedfile, remote_host) == EOF ||
- fflush(lockfile))
- sysdie("write info to lockfile %s", path_lock);
-
- dbg("startup: locked");
-}
-
-static void statemc_init(void) {
- struct stat stabdefer;
-
- search_backlog_file();
-
- int defer_noent;
- xlstat_isreg(path_defer, &stabdefer, &defer_noent, "defer file");
- if (defer_noent) {
- dbg("startup: ductdefer ENOENT");
- } else {
- dbg("startup: ductdefer nlink=%ld", (long)stabdefer.st_nlink);
- switch (stabdefer.st_nlink==1) {
- case 1:
- open_defer(); /* so that we will later close it and rename it */
- break;
- case 2:
- xunlink(path_defer, "stale defer file link"
- " (presumably hardlink to backlog file)");
- break;
- default:
- crash("defer file %s has unexpected link count %d",
- path_defer, stabdefer.st_nlink);
- }
- }
-
- struct stat stab_f, stab_d;
- int noent_f;
-
- InputFile *file_d= open_input_file(path_flushing);
- if (file_d) xfstat_isreg(file_d->fd, &stab_d, path_flushing,"flushing file");
-
- xlstat_isreg(feedfile, &stab_f, &noent_f, "feedfile");
-
- if (!noent_f && file_d && samefile(&stab_f, &stab_d)) {
- dbg("startup: F==D => Hardlinked");
- xunlink(feedfile, "feed file (during startup)"); /* => Moved */
- noent_f= 1;
- }
-
- if (noent_f) {
- dbg("startup: F ENOENT => Moved");
- if (file_d) startup_set_input_file(file_d);
- spawn_inndcomm_flush("feedfile missing at startup");
- /* => Flushing, sms:=FLUSHING */
- } else {
- if (file_d) {
- dbg("startup: F!=D => Separated");
- startup_set_input_file(file_d);
- flushing_input_file= main_input_file;
- main_input_file= open_input_file(feedfile);
- if (!main_input_file) crash("feedfile vanished during startup");
- SMS(SEPARATED, max_separated_periods,
- "found both old and current feed files");
- } else {
- dbg("startup: F exists, D ENOENT => Normal");
- InputFile *file_f= open_input_file(feedfile);
- if (!file_f) crash("feed file vanished during startup");
- startup_set_input_file(file_f);
- SMS(NORMAL, spontaneous_flush_periods, "normal startup");
- }
- }
-}
-
-static void statemc_start_flush(const char *why) { /* Normal => Flushing */
- assert(sms == sm_NORMAL);
-
- dbg("starting flush (%s) (%lu >?= %lu) (%d)",
- why,
- (unsigned long)(main_input_file ? main_input_file->offset : 0),
- (unsigned long)target_max_feedfile_size,
- until_flush);
-
- int r= link(feedfile, path_flushing);
- if (r) sysdie("link feedfile %s to flushing file %s",
- feedfile, path_flushing);
- /* => Hardlinked */
-
- xunlink(feedfile, "old feedfile link");
- /* => Moved */
-
- spawn_inndcomm_flush(why); /* => Flushing FLUSHING */
-}
-
-static int trigger_flush_ok(const char *why) {
- switch (sms) {
-
- case sm_NORMAL:
- statemc_start_flush(why ? why : "periodic");
- return 1; /* Normal => Flushing; => FLUSHING */
-
- case sm_FLUSHFAILED:
- spawn_inndcomm_flush(why ? why : "retry");
- return 1; /* Moved => Flushing; => FLUSHING */
-
- case sm_SEPARATED:
- case sm_DROPPING:
- warn("abandoning old feedfile after flush (%s), autodeferring",
- why ? why : "took too long to complete");
- assert(flushing_input_file);
- autodefer_input_file(flushing_input_file);
- return 1;
-
- default:
- return 0;
- }
-}
-
-static void statemc_period_poll(void) {
- if (!until_flush) return;
- until_flush--;
- assert(until_flush>=0);
-
- if (until_flush) return;
- int ok= trigger_flush_ok(0);
- assert(ok);
-}
-
-static int inputfile_is_done(InputFile *ipf) {
- if (!ipf) return 0;
- if (ipf->inprogress) return 0; /* new article in the meantime */
- if (ipf->rd) return 0; /* not had EOF */
- return 1;
-}
-
-static void notice_processed(InputFile *ipf, int completed,
- const char *what, const char *spec) {
- if (!ipf) return; /* allows preterminate to be lazy */
-
-#define RCI_NOTHING(x) /* nothing */
-#define RCI_TRIPLE_FMT(x) " " #x "=" RCI_TRIPLE_FMT_BASE
-#define RCI_TRIPLE_VALS(x) , RCI_TRIPLE_VALS_BASE(ipf->counts, [RC_##x])
-
-#define CNT(art,rc) (ipf->counts[art_##art][RC_##rc])
-
- char *inprog= completed
- ? xasprintf("%s","") /* GCC produces a stupid warning for printf("") ! */
- : xasprintf(" inprogress=%ld", ipf->inprogress);
- char *autodefer= ipf->autodefer >= 0
- ? xasprintf(" autodeferred=%ld", ipf->autodefer)
- : xasprintf("%s","");
-
- info("%s %s%s read=%d (+bl=%d,+err=%d)%s%s"
- " missing=%d offered=%d (ch=%d,nc=%d) accepted=%d (ch=%d,nc=%d)"
- RESULT_COUNTS(RCI_NOTHING, RCI_TRIPLE_FMT)
- ,
- completed?"completed":"processed", what, spec,
- ipf->readcount_ok, ipf->readcount_blank, ipf->readcount_err,
- inprog, autodefer, ipf->count_nooffer_missing,
- CNT(Unchecked,sent) + CNT(Unsolicited,sent)
- , CNT(Unchecked,sent), CNT(Unsolicited,sent),
- CNT(Wanted,accepted) + CNT(Unsolicited,accepted)
- , CNT(Wanted,accepted), CNT(Unsolicited,accepted)
- RESULT_COUNTS(RCI_NOTHING, RCI_TRIPLE_VALS)
- );
-
- free(inprog);
- free(autodefer);
-
-#undef CNT
-}
-
-static void statemc_check_backlog_done(void) {
- InputFile *ipf= backlog_input_file;
- if (!inputfile_is_done(ipf)) return;
-
- const char *slash= strrchr(ipf->path, '/');
- const char *leaf= slash ? slash+1 : ipf->path;
- const char *under= strchr(slash, '_');
- const char *rest= under ? under+1 : leaf;
- if (!strncmp(rest,"backlog",7)) rest += 7;
- notice_processed(ipf,1,"backlog ",rest);
-
- close_input_file(ipf);
- if (unlink(ipf->path)) {
- if (errno != ENOENT)
- syscrash("could not unlink processed backlog file %s", ipf->path);
- warn("backlog file %s vanished while we were reading it"
- " so we couldn't remove it (but it's done now, anyway)",
- ipf->path);
- }
- free(ipf);
- backlog_input_file= 0;
- search_backlog_file();
- return;
-}
-
-static void statemc_check_flushing_done(void) {
- InputFile *ipf= flushing_input_file;
- if (!inputfile_is_done(ipf)) return;
-
- assert(sms==sm_SEPARATED || sms==sm_DROPPING);
-
- notice_processed(ipf,1,"feedfile","");
-
- close_defer();
-
- xunlink(path_flushing, "old flushing file");
-
- close_input_file(flushing_input_file);
- free(flushing_input_file);
- flushing_input_file= 0;
-
- if (sms==sm_SEPARATED) {
- notice("flush complete");
- SMS(NORMAL, spontaneous_flush_periods, "flush complete");
- } else if (sms==sm_DROPPING) {
- SMS(DROPPED, max_separated_periods, "old flush complete");
- search_backlog_file();
- notice("feed dropped, but will continue until backlog is finished");
- }
-}
-
-static void *statemc_check_input_done(oop_source *lp, struct timeval now,
- void *u) {
- /* main input file may be idle but if so that's because
- * we haven't got to it yet, but that doesn't mean it's really done */
- statemc_check_flushing_done();
- statemc_check_backlog_done();
- return OOP_CONTINUE;
-}
-
-static void queue_check_input_done(void) {
- loop->on_time(loop, OOP_TIME_NOW, statemc_check_input_done, 0);
-}
-
-static void statemc_setstate(StateMachineState newsms, int periods,
- const char *forlog, const char *why) {
- sms= newsms;
- until_flush= periods;
-
- const char *xtra= "";
- switch (sms) {
- case sm_FLUSHING:
- case sm_FLUSHFAILED:
- if (!main_input_file) xtra= "-ABSENT";
- break;
- case sm_SEPARATED:
- case sm_DROPPING:
- xtra= flushing_input_file->rd ? "-1" : "-2";
- break;
- default:;
- }
-
- if (periods) {
- info("state %s%s[%d] %s",forlog,xtra,periods,why);
- } else {
- info("state %s%s %s",forlog,xtra,why);
- }
-}
-
-/*---------- defer and backlog files ----------*/
-
-static void open_defer(void) {
- struct stat stab;
-
- if (defer) return;
-
- defer= fopen(path_defer, "a+");
- if (!defer) sysdie("could not open defer file %s", path_defer);
-
- /* truncate away any half-written records */
-
- xfstat_isreg(fileno(defer), &stab, path_defer, "newly opened defer file");
-
- if (stab.st_size > LONG_MAX)
- crash("defer file %s size is far too large", path_defer);
-
- if (!stab.st_size)
- return;
-
- long orgsize= stab.st_size;
- long truncto= stab.st_size;
- for (;;) {
- if (!truncto) break; /* was only (if anything) one half-truncated record */
- if (fseek(defer, truncto-1, SEEK_SET) < 0)
- syscrash("seek in defer file %s while truncating partial", path_defer);
-
- int r= getc(defer);
- if (r==EOF) {
- if (ferror(defer))
- syscrash("failed read from defer file %s", path_defer);
- else
- crash("defer file %s shrank while we were checking it!", path_defer);
- }
- if (r=='\n') break;
- truncto--;
- }
-
- if (stab.st_size != truncto) {
- warn("truncating half-record at end of defer file %s -"
- " shrinking by %ld bytes from %ld to %ld",
- path_defer, orgsize - truncto, orgsize, truncto);
-
- if (fflush(defer))
- sysdie("could not flush defer file %s", path_defer);
- if (ftruncate(fileno(defer), truncto))
- syscrash("could not truncate defer file %s", path_defer);
-
- } else {
- info("continuing existing defer file %s (%ld bytes)",
- path_defer, orgsize);
- }
- if (fseek(defer, truncto, SEEK_SET))
- syscrash("could not seek to new end of defer file %s", path_defer);
-}
-
-static void close_defer(void) {
- if (!defer)
- return;
-
- struct stat stab;
- xfstat_isreg(fileno(defer), &stab, path_defer, "defer file");
-
- if (fclose(defer)) sysdie("could not close defer file %s", path_defer);
- defer= 0;
-
- time_t now= xtime();
-
- char *backlog= xasprintf("%s_backlog_%lu.%lu", feedfile,
- (unsigned long)now,
- (unsigned long)stab.st_ino);
- if (link(path_defer, backlog))
- sysdie("could not install defer file %s as backlog file %s",
- path_defer, backlog);
- if (unlink(path_defer))
- syscrash("could not unlink old defer link %s to backlog file %s",
- path_defer, backlog);
-
- free(backlog);
-
- if (until_backlog_nextscan < 0 ||
- until_backlog_nextscan > backlog_retry_minperiods + 1)
- until_backlog_nextscan= backlog_retry_minperiods + 1;
-}
-
-static void poll_backlog_file(void) {
- if (until_backlog_nextscan < 0) return;
- if (until_backlog_nextscan-- > 0) return;
- search_backlog_file();
-}
-
-static void search_backlog_file(void) {
- /* returns non-0 iff there are any backlog files */
-
- glob_t gl;
- int r;
- unsigned ui;
- struct stat stab;
- const char *oldest_path=0;
- time_t oldest_mtime=0, now;
-
- if (backlog_input_file) return;
-
- try_again:
-
- r= glob(globpat_backlog, GLOB_ERR|GLOB_MARK|GLOB_NOSORT, 0, &gl);
-
- switch (r) {
- case GLOB_ABORTED:
- sysdie("failed to expand backlog pattern %s", globpat_backlog);
- case GLOB_NOSPACE:
- die("out of memory expanding backlog pattern %s", globpat_backlog);
- case 0:
- for (ui=0; ui<gl.gl_pathc; ui++) {
- const char *path= gl.gl_pathv[ui];
-
- if (strchr(path,'#') || strchr(path,'~')) {
- dbg("backlog file search skipping %s", path);
- continue;
- }
- r= stat(path, &stab);
- if (r) {
- syswarn("failed to stat backlog file %s", path);
- continue;
- }
- if (!S_ISREG(stab.st_mode)) {
- warn("backlog file %s is not a plain file (or link to one)", path);
- continue;
- }
- if (!oldest_path || stab.st_mtime < oldest_mtime) {
- oldest_path= path;
- oldest_mtime= stab.st_mtime;
- }
- }
- case GLOB_NOMATCH: /* fall through */
- break;
- default:
- syscrash("glob expansion of backlog pattern %s gave unexpected"
- " nonzero (error?) return value %d", globpat_backlog, r);
- }
-
- if (!oldest_path) {
- dbg("backlog scan: none");
-
- if (sms==sm_DROPPED) {
- preterminate();
- notice("feed dropped and our work is complete");
-
- r= unlink(path_cli);
- if (r && errno!=ENOENT)
- syswarn("failed to unlink cli socket for old feed");
-
- xunlink(path_lock, "lockfile for old feed");
- exit(4);
- }
- until_backlog_nextscan= backlog_spontrescan_periods;
- goto xfree;
- }
-
- now= xtime();
- double age= difftime(now, oldest_mtime);
- long age_deficiency= (backlog_retry_minperiods * period_seconds) - age;
-
- if (age_deficiency <= 0) {
- dbg("backlog scan: found age=%f deficiency=%ld oldest=%s",
- age, age_deficiency, oldest_path);
-
- backlog_input_file= open_input_file(oldest_path);
- if (!backlog_input_file) {
- warn("backlog file %s vanished as we opened it", oldest_path);
- globfree(&gl);
- goto try_again;
- }
- inputfile_reading_start(backlog_input_file);
- until_backlog_nextscan= -1;
- goto xfree;
- }
-
- until_backlog_nextscan= age_deficiency / period_seconds;
-
- if (backlog_spontrescan_periods >= 0 &&
- until_backlog_nextscan > backlog_spontrescan_periods)
- until_backlog_nextscan= backlog_spontrescan_periods;
-
- dbg("backlog scan: young age=%f deficiency=%ld nextscan=%d oldest=%s",
- age, age_deficiency, until_backlog_nextscan, oldest_path);
-
- xfree:
- globfree(&gl);
- return;
-}
-
-/*---------- shutdown and signal handling ----------*/
-
-static void preterminate(void) {
- if (in_child) return;
- notice_processed(main_input_file,0,"feedfile","");
- notice_processed(flushing_input_file,0,"flushing","");
- if (backlog_input_file)
- notice_processed(backlog_input_file,0, "backlog file ",
- backlog_input_file->path);
-}
-
-static int signal_self_pipe[2];
-static sig_atomic_t terminate_sig_flag;
-
-static void raise_default(int signo) {
- xsigsetdefault(signo);
- raise(signo);
- abort();
-}
-
-static void *sigarrived_event(oop_source *lp, int fd, oop_event e, void *u) {
- assert(fd=signal_self_pipe[0]);
- char buf[PIPE_BUF];
- int r= read(signal_self_pipe[0], buf, sizeof(buf));
- if (r<0 && !isewouldblock(errno))
- syscrash("failed to read signal self pipe");
- if (r==0) crash("eof on signal self pipe");
- if (terminate_sig_flag) {
- preterminate();
- notice("terminating (%s)", strsignal(terminate_sig_flag));
- raise_default(terminate_sig_flag);
- }
- return OOP_CONTINUE;
-}
-
-static void sigarrived_handler(int signum) {
- static char x;
- switch (signum) {
- case SIGTERM:
- case SIGINT:
- if (!terminate_sig_flag) terminate_sig_flag= signum;
- break;
- default:
- abort();
- }
- write(signal_self_pipe[1],&x,1);
-}
-
-static void init_signals(void) {
- if (signal(SIGPIPE, SIG_IGN) == SIG_ERR)
- syscrash("could not ignore SIGPIPE");
-
- if (pipe(signal_self_pipe)) sysdie("create self-pipe for signals");
-
- xsetnonblock(signal_self_pipe[0],1);
- xsetnonblock(signal_self_pipe[1],1);
-
- struct sigaction sa;
- memset(&sa,0,sizeof(sa));
- sa.sa_handler= sigarrived_handler;
- sa.sa_flags= SA_RESTART;
- xsigaction(SIGTERM,&sa);
- xsigaction(SIGINT,&sa);
-
- on_fd_read_except(signal_self_pipe[0], sigarrived_event);
-}
-
-/*========== flushing the feed ==========*/
-
-static pid_t inndcomm_child;
-static int inndcomm_sentinel_fd;
-
-static void *inndcomm_event(oop_source *lp, int fd, oop_event e, void *u) {
- assert(inndcomm_child);
- assert(fd == inndcomm_sentinel_fd);
- int status= xwaitpid(&inndcomm_child, "inndcomm");
- inndcomm_child= 0;
-
- cancel_fd_read_except(fd);
- xclose_perhaps(&fd, "inndcomm sentinel pipe",0);
- inndcomm_sentinel_fd= 0;
-
- assert(!flushing_input_file);
-
- if (WIFEXITED(status)) {
- switch (WEXITSTATUS(status)) {
-
- case INNDCOMMCHILD_ESTATUS_FAIL:
- goto failed;
-
- case INNDCOMMCHILD_ESTATUS_NONESUCH:
- notice("feed has been dropped by innd, finishing up");
- flushing_input_file= main_input_file;
- tailing_make_readable(flushing_input_file);
- /* we probably previously returned EAGAIN from our fake read method
- * when in fact we were at EOF, so signal another readable event
- * so we actually see the EOF */
-
- main_input_file= 0;
-
- if (flushing_input_file) {
- SMS(DROPPING, max_separated_periods,
- "feed dropped by innd, but must finish last flush");
- } else {
- close_defer();
- SMS(DROPPED, 0, "feed dropped by innd");
- search_backlog_file();
- }
- return OOP_CONTINUE;
-
- case 0:
- /* as above */
- flushing_input_file= main_input_file;
- tailing_make_readable(flushing_input_file);
-
- main_input_file= open_input_file(feedfile);
- if (!main_input_file)
- crash("flush succeeded but feedfile %s does not exist!"
- " (this probably means feedfile does not correspond"
- " to site %s in newsfeeds)", feedfile, sitename);
-
- if (flushing_input_file) {
- SMS(SEPARATED, max_separated_periods, "flush complete");
- } else {
- close_defer();
- SMS(NORMAL, spontaneous_flush_periods, "recovery flush complete");
- }
- return OOP_CONTINUE;
-
- default:
- goto unexpected_exitstatus;
-
- }
- } else if (WIFSIGNALED(status) && WTERMSIG(status) == SIGALRM) {
- warn("flush timed out trying to talk to innd");
- goto failed;
- } else {
- unexpected_exitstatus:
- report_child_status("inndcomm child", status);
- }
-
- failed:
- SMS(FLUSHFAILED, flushfail_retry_periods, "flush failed, will retry");
- return OOP_CONTINUE;
-}
-
-static void inndcommfail(const char *what) {
- syswarn("error communicating with innd: %s failed: %s", what, ICCfailure);
- exit(INNDCOMMCHILD_ESTATUS_FAIL);
-}
-
-void spawn_inndcomm_flush(const char *why) { /* Moved => Flushing */
- int pipefds[2];
-
- notice("flushing %s",why);
-
- assert(sms==sm_NORMAL || sms==sm_FLUSHFAILED);
- assert(!inndcomm_child);
- assert(!inndcomm_sentinel_fd);
-
- if (pipe(pipefds)) sysdie("create pipe for inndcomm child sentinel");
-
- inndcomm_child= xfork("inndcomm child");
-
- if (!inndcomm_child) {
- const char *flushargv[2]= { sitename, 0 };
- char *reply;
- int r;
-
- xclose(pipefds[0], "(in child) inndcomm sentinel parent's end",0);
- /* parent spots the autoclose of pipefds[1] when we die or exit */
-
- if (simulate_flush>=0) {
- warn("SIMULATING flush child status %d", simulate_flush);
- if (simulate_flush>128) raise(simulate_flush-128);
- else exit(simulate_flush);
- }
-
- alarm(inndcomm_flush_timeout);
- r= ICCopen(); if (r) inndcommfail("connect");
- r= ICCcommand('f',flushargv,&reply); if (r<0) inndcommfail("transmit");
- if (!r) exit(0); /* yay! */
-
- if (!strcmp(reply, "1 No such site")) exit(INNDCOMMCHILD_ESTATUS_NONESUCH);
- syswarn("innd ctlinnd flush failed: innd said %s", reply);
- exit(INNDCOMMCHILD_ESTATUS_FAIL);
- }
+struct Conn {
+ ISNODE(Conn);
+ int fd; /* may be 0, meaning closed (during construction/destruction) */
+ oop_read *rd; /* likewise */
+ int oopwriting; /* since on_fd is not idempotent */
+ int max_queue, stream;
+ const char *quitting;
+ int since_activity; /* periods */
+ ArticleList waiting; /* not yet told peer */
+ ArticleList priority; /* peer says send it now */
+ ArticleList sent; /* offered/transmitted - in xmit or waiting reply */
+ struct iovec xmit[CONNIOVS];
+ XmitDetails xmitd[CONNIOVS];
+ int xmitu;
+};
- simulate_flush= -1;
- xclose(pipefds[1], "inndcomm sentinel child's end",0);
- inndcomm_sentinel_fd= pipefds[0];
- assert(inndcomm_sentinel_fd);
- on_fd_read_except(inndcomm_sentinel_fd, inndcomm_event);
+/*----- general operational variables -----*/
- SMS(FLUSHING, 0, why);
-}
+/* main initialises */
+oop_source *loop;
+ConnList conns;
+char *path_lock, *path_flushing, *path_defer, *path_dump;
+char *globpat_backlog;
+pid_t self_pid;
+int *lowvol_perperiod;
+int lowvol_circptr;
+int lowvol_total; /* does not include current period */
/*========== main program ==========*/
if (fclose(f)) syscrash("(in child) close %s%s", what, what2?what2:0);
}
-static void postfork(void) {
+void postfork(void) {
in_child= 1;
xsigsetdefault(SIGTERM);
every_schedule(e, now);
}
-static void filepoll(void) {
- tailing_make_readable(main_input_file);
- tailing_make_readable(flushing_input_file);
-}
-
static char *dbg_report_ipf(InputFile *ipf) {
if (!ipf) return xasprintf("none");
}
-/*========== dumping state ==========*/
-
-static void dump_article_list(FILE *f, const CliCommand *c,
- const ArticleList *al) {
- fprintf(f, " count=%d\n", al->count);
- if (!c->xval) return;
-
- int i; Article *art;
- for (i=0, art=LIST_HEAD(*al); art; i++, art=LIST_NEXT(art)) {
- fprintf(f," #%05d %-11s", i, artstate_names[art->state]);
- DUMPV("%p", art->,ipf);
- DUMPV("%d", art->,missing);
- DUMPV("%lu", (unsigned long)art->,offset);
- DUMPV("%d", art->,blanklen);
- DUMPV("%d", art->,midlen);
- fprintf(f, " %s %s\n", TokenToText(art->token), art->messageid);
- }
-}
-
-static void dump_input_file(FILE *f, const CliCommand *c,
- InputFile *ipf, const char *wh) {
- char *dipf= dbg_report_ipf(ipf);
- fprintf(f,"input %s %s", wh, dipf);
- free(dipf);
-
- if (ipf) {
- DUMPV("%d", ipf->,readcount_ok);
- DUMPV("%d", ipf->,readcount_blank);
- DUMPV("%d", ipf->,readcount_err);
- DUMPV("%d", ipf->,count_nooffer_missing);
- }
- fprintf(f,"\n");
- if (ipf) {
- ArtState state; const char *const *statename;
- for (state=0, statename=artstate_names; *statename; state++,statename++) {
-#define RC_DUMP_FMT(x) " " #x "=%d"
-#define RC_DUMP_VAL(x) ,ipf->counts[state][RC_##x]
- fprintf(f,"input %s counts %-11s"
- RESULT_COUNTS(RC_DUMP_FMT,RC_DUMP_FMT) "\n",
- wh, *statename
- RESULT_COUNTS(RC_DUMP_VAL,RC_DUMP_VAL));
- }
- fprintf(f,"input %s queue", wh);
- dump_article_list(f,c,&ipf->queue);
- }
-}
-
-CCMD(dump) {
- int i;
- fprintf(cc->out, "dumping state to %s\n", path_dump);
- FILE *f= fopen(path_dump, "w");
- if (!f) { fprintf(cc->out, "failed: open: %s\n", strerror(errno)); return; }
-
- fprintf(f,"general");
- DUMPV("%s", sms_names,[sms]);
- DUMPV("%d", ,until_flush);
- DUMPV("%ld", (long),self_pid);
- DUMPV("%p", , defer);
- DUMPV("%d", , until_connect);
- DUMPV("%d", , until_backlog_nextscan);
- DUMPV("%d", , simulate_flush);
- fprintf(f,"\nnocheck");
- DUMPV("%#.10f", , accept_proportion);
- DUMPV("%d", , nocheck);
- DUMPV("%d", , nocheck_reported);
- fprintf(f,"\n");
-
- fprintf(f,"special");
- DUMPV("%ld", (long),connecting_child);
- DUMPV("%d", , connecting_fdpass_sock);
- DUMPV("%d", , cli_master);
- fprintf(f,"\n");
-
- fprintf(f,"lowvol");
- DUMPV("%d", , lowvol_circptr);
- DUMPV("%d", , lowvol_total);
- fprintf(f,":");
- for (i=0; i<lowvol_periods; i++) {
- fprintf(f," ");
- if (i==lowvol_circptr) fprintf(f,"*");
- fprintf(f,"%d",lowvol_perperiod[i]);
- }
- fprintf(f,"\n");
-
- fprintf(f,"filemon ");
- filemon_method_dump_info(f);
-
- dump_input_file(f,c, main_input_file, "main" );
- dump_input_file(f,c, flushing_input_file, "flushing");
- dump_input_file(f,c, backlog_input_file, "backlog" );
-
- fprintf(f,"conns count=%d\n", conns.count);
-
- Conn *conn;
- FOR_CONN(conn) {
-
- fprintf(f,"C%d",conn->fd);
- DUMPV("%p",conn->,rd); DUMPV("%d",conn->,max_queue);
- DUMPV("%d",conn->,stream); DUMPV("\"%s\"",conn->,quitting);
- DUMPV("%d",conn->,since_activity);
- fprintf(f,"\n");
-
- fprintf(f,"C%d waiting", conn->fd); dump_article_list(f,c,&conn->waiting);
- fprintf(f,"C%d priority",conn->fd); dump_article_list(f,c,&conn->priority);
- fprintf(f,"C%d sent", conn->fd); dump_article_list(f,c,&conn->sent);
-
- fprintf(f,"C%d xmit xmitu=%d\n", conn->fd, conn->xmitu);
- for (i=0; i<conn->xmitu; i++) {
- const struct iovec *iv= &conn->xmit[i];
- const XmitDetails *xd= &conn->xmitd[i];
- char *dinfo;
- switch (xd->kind) {
- case xk_Const: dinfo= xasprintf("Const"); break;
- case xk_Artdata: dinfo= xasprintf("A%p", xd->info.sm_art); break;
- default:
- abort();
- }
- fprintf(f," #%03d %-11s l=%d %s\n", i, dinfo, iv->iov_len,
- sanitise(iv->iov_base, iv->iov_len));
- free(dinfo);
- }
- }
-
- fprintf(f,"paths");
- DUMPV("%s", , feedfile);
- DUMPV("%s", , path_cli);
- DUMPV("%s", , path_lock);
- DUMPV("%s", , path_flushing);
- DUMPV("%s", , path_defer);
- DUMPV("%s", , path_dump);
- DUMPV("%s", , globpat_backlog);
- fprintf(f,"\n");
-
- if (!!ferror(f) + !!fclose(f)) {
- fprintf(cc->out, "failed: write: %s\n", strerror(errno));
- return;
- }
-}
-
/*========== option parsing ==========*/
static void vbadusage(const char *fmt, va_list al) NORET_PRINTF(1,0);
--- /dev/null
+/*
+ * innduct
+ * tailing reliable realtime streaming feeder for inn
+ *
+ * Copyright (C) 2010 Ian Jackson <ijackson@chiark.greenend.org.uk>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ *
+ * (I believe that when you compile and link this as part of the inn2
+ * build, with the Makefile runes I have provided, all the libraries
+ * and files which end up included in innduct are licence-compatible
+ * with GPLv3. If not then please let me know. -Ian Jackson.)
+ */
+
+#ifndef INNDUCT_H
+#define INNDUCT_H
+
+#define _GNU_SOURCE 1
+
+#include "config.h"
+#include "storage.h"
+#include "nntp.h"
+#include "libinn.h"
+#include "inndcomm.h"
+
+#include "inn/list.h"
+#include "inn/innconf.h"
+#include "inn/messages.h"
+
+#include <sys/uio.h>
+#include <sys/types.h>
+#include <sys/wait.h>
+#include <sys/stat.h>
+#include <sys/socket.h>
+#include <sys/un.h>
+#include <unistd.h>
+#include <string.h>
+#include <signal.h>
+#include <stdio.h>
+#include <errno.h>
+#include <syslog.h>
+#include <fcntl.h>
+#include <stdarg.h>
+#include <assert.h>
+#include <stdlib.h>
+#include <stddef.h>
+#include <glob.h>
+#include <time.h>
+#include <math.h>
+#include <ctype.h>
+
+#include <oop.h>
+#include <oop-read.h>
+
+/*----- general definitions, probably best not changed -----*/
+
+#define CONNCHILD_ESTATUS_STREAM 24
+#define CONNCHILD_ESTATUS_NOSTREAM 25
+
+#define INNDCOMMCHILD_ESTATUS_FAIL 26
+#define INNDCOMMCHILD_ESTATUS_NONESUCH 27
+
+#define MAX_LINE_FEEDFILE (NNTP_MSGID_MAXLEN + sizeof(TOKEN)*2 + 10)
+#define MAX_CLI_COMMAND 1000
+
+#define VA va_list al; va_start(al,fmt)
+#define PRINTF(f,a) __attribute__((__format__(printf,f,a)))
+#define NORET_PRINTF(f,a) __attribute__((__noreturn__,__format__(printf,f,a)))
+#define NORET __attribute__((__noreturn__))
+
+#define NEW(ptr) ((ptr)= zxmalloc(sizeof(*(ptr))))
+#define NEW_DECL(type,ptr) type ptr = zxmalloc(sizeof(*(ptr)))
+
+#define DUMPV(fmt,pfx,v) fprintf(f, " " #v "=" fmt, pfx v);
+
+#define FOR_CONN(conn) \
+ for ((conn)=LIST_HEAD(conns); (conn); (conn)=LIST_NEXT((conn)))
+
+/*----- doubly linked lists -----*/
+
+#define ISNODE(T) struct node list_node
+#define DEFLIST(T) \
+ typedef struct { \
+ union { struct list li; T *for_type; } u; \
+ int count; \
+ } T##List
+
+#define NODE(n) (assert((void*)&(n)->list_node == (n)), &(n)->list_node)
+
+#define LIST_CHECKCANHAVENODE(l,n) \
+ ((void)((n) == ((l).u.for_type))) /* just for the type check */
+
+#define LIST_ADDSOMEHOW(l,n,list_addsomehow) \
+ ( LIST_CHECKCANHAVENODE(l,n), \
+ list_addsomehow(&(l).u.li, NODE((n))), \
+ (void)(l).count++ \
+ )
+
+#define LIST_REMSOMEHOW(l,list_remsomehow) \
+ ( (typeof((l).u.for_type)) \
+ ( (l).count \
+ ? ( (l).count--, \
+ list_remsomehow(&(l).u.li) ) \
+ : 0 \
+ ) \
+ )
+
+
+#define LIST_ADDHEAD(l,n) LIST_ADDSOMEHOW((l),(n),list_addhead)
+#define LIST_ADDTAIL(l,n) LIST_ADDSOMEHOW((l),(n),list_addtail)
+#define LIST_REMHEAD(l) LIST_REMSOMEHOW((l),list_remhead)
+#define LIST_REMTAIL(l) LIST_REMSOMEHOW((l),list_remtail)
+
+#define LIST_INIT(l) ((l).count=0, list_new(&(l).u.li))
+#define LIST_HEAD(l) ((typeof((l).u.for_type))(list_head((struct list*)&(l))))
+#define LIST_NEXT(n) ((typeof(n))list_succ(NODE((n))))
+#define LIST_BACK(n) ((typeof(n))list_pred(NODE((n))))
+
+#define LIST_REMOVE(l,n) \
+ ( LIST_CHECKCANHAVENODE(l,n), \
+ list_remove(NODE((n))), \
+ (void)(l).count-- \
+ )
+
+#define LIST_INSERT(l,n,pred) \
+ ( LIST_CHECKCANHAVENODE(l,n), \
+ LIST_CHECKCANHAVENODE(l,pred), \
+ list_insert((struct list*)&(l), NODE((n)), NODE((pred))), \
+ (void)(l).count++ \
+ )
+
+/*----- type predeclarations -----*/
+
+typedef struct Conn Conn;
+typedef struct Article Article;
+typedef struct InputFile InputFile;
+typedef struct XmitDetails XmitDetails;
+typedef struct Filemon_Perfile Filemon_Perfile;
+typedef enum StateMachineState StateMachineState;
+typedef struct CliCommand CliCommand;
+
+DEFLIST(Conn);
+DEFLIST(Article);
+
+
+/*----- configuration options -----*/
+/* when changing defaults, remember to update the manpage */
+
+static const char *sitename, *remote_host;
+static const char *feedfile, *path_run, *path_cli, *path_cli_dir;
+static int quiet_multiple=0;
+static int interactive=0, try_filemon=1;
+static int try_stream=1;
+static int port=119;
+static const char *inndconffile;
+
+static int max_connections=10;
+static int max_queue_per_conn=200;
+static int target_max_feedfile_size=100000;
+static int period_seconds=30;
+static int filepoll_seconds=5;
+static int max_queue_per_ipf=-1;
+
+static int connection_setup_timeout=200;
+static int inndcomm_flush_timeout=100;
+
+static double nocheck_thresh= 95.0; /* converted from percentage by main */
+static double nocheck_decay= 100; /* conv'd from articles to lambda by main */
+
+/* all these are initialised to seconds, and converted to periods in main */
+static int reconnect_delay_periods=1000;
+static int flushfail_retry_periods=1000;
+static int backlog_retry_minperiods=100;
+static int backlog_spontrescan_periods=300;
+static int spontaneous_flush_periods=100000;
+static int max_separated_periods=2000;
+static int need_activity_periods=1000;
+static int lowvol_thresh=3;
+static int lowvol_periods=1000;
+
+static double max_bad_data_ratio= 1; /* conv'd from percentage by main */
+static int max_bad_data_initial= 30;
+ /* in one corrupt 4096-byte block the number of newlines has
+ * mean 16 and standard deviation 3.99. 30 corresponds to z=+3.5 */
+
+
+/*----- statistics -----*/
+
+typedef enum { /* in queue in conn->sent */
+ art_Unchecked, /* not checked, not sent checking */
+ art_Wanted, /* checked, wanted sent body as requested */
+ art_Unsolicited, /* - sent body without check */
+ art_MaxState,
+} ArtState;
+
+static const char *const artstate_names[]=
+ { "Unchecked", "Wanted", "Unsolicited", 0 };
+
+#define RESULT_COUNTS(RCS,RCN) \
+ RCS(sent) \
+ RCS(accepted) \
+ RCN(unwanted) \
+ RCN(rejected) \
+ RCN(deferred) \
+ RCN(missing) \
+ RCN(connretry)
+
+#define RCI_TRIPLE_FMT_BASE "%d (id=%d,bod=%d,nc=%d)"
+#define RCI_TRIPLE_VALS_BASE(counts,x) \
+ counts[art_Unchecked] x \
+ + counts[art_Wanted] x \
+ + counts[art_Unsolicited] x, \
+ counts[art_Unchecked] x \
+ , counts[art_Wanted] x \
+ , counts[art_Unsolicited] x
+
+typedef enum {
+#define RC_INDEX(x) RC_##x,
+ RESULT_COUNTS(RC_INDEX, RC_INDEX)
+ RCI_max
+} ResultCountIndex;
+
+
+/*----- transmission buffers -----*/
+
+#define CONNIOVS 128
+
+typedef enum {
+ xk_Const, xk_Artdata
+} XmitKind;
+
+struct XmitDetails {
+ XmitKind kind;
+ union {
+ ARTHANDLE *sm_art;
+ } info;
+};
+
+
+/*----- core operational data structure types -----*/
+
+struct InputFile {
+ /* This is also an instance of struct oop_readable */
+ struct oop_readable readable; /* first */
+ oop_readable_call *readable_callback;
+ void *readable_callback_user;
+
+ int fd;
+ Filemon_Perfile *filemon;
+
+ oop_read *rd; /* non-0: reading; 0: constructing, or had EOF */
+ off_t offset;
+ int skippinglong, paused, fake_readable;
+
+ ArticleList queue;
+ long inprogress; /* includes queue.count and also articles in conns */
+ long autodefer; /* -1 means not doing autodefer */
+
+ int counts[art_MaxState][RCI_max];
+ int readcount_ok, readcount_blank, readcount_err, count_nooffer_missing;
+ char path[];
+};
+
+struct Article {
+ ISNODE(Article);
+ ArtState state;
+ int midlen, missing;
+ InputFile *ipf;
+ TOKEN token;
+ off_t offset;
+ int blanklen;
+ char messageid[1];
+};
+
+#define SMS_LIST(X) \
+ X(NORMAL) \
+ X(FLUSHING) \
+ X(FLUSHFAILED) \
+ X(SEPARATED) \
+ X(DROPPING) \
+ X(DROPPED)
+
+enum StateMachineState {
+#define SMS_DEF_ENUM(s) sm_##s,
+ SMS_LIST(SMS_DEF_ENUM)
+};
+
+extern const char *sms_names[];
+
+/*========== function declarations ==========*/
+
+/*----- help.c -----*/
+
+static void syscrash(const char *fmt, ...) NORET_PRINTF(1,2);
+static void crash(const char *fmt, ...) NORET_PRINTF(1,2);
+static void info(const char *fmt, ...) PRINTF(1,2);
+static void dbg(const char *fmt, ...) PRINTF(1,2);
+
+void logv(int sysloglevel, const char *pfx, int errnoval,
+ const char *fmt, va_list al) PRINTF(5,0);
+
+char *xvasprintf(const char *fmt, va_list al) PRINTF(1,0);
+char *xasprintf(const char *fmt, ...) PRINTF(1,2);
+
+int close_perhaps(int *fd);
+void xclose(int fd, const char *what, const char *what2);
+void xclose_perhaps(int *fd, const char *what, const char *what2);
+pid_t xfork(const char *what);
+
+static void on_fd_read_except(int fd, oop_call_fd callback);
+void cancel_fd_read_except(int fd);
+
+void report_child_status(const char *what, int status);
+int xwaitpid(pid_t *pid, const char *what);
+
+void *zxmalloc(size_t sz);
+void xunlink(const char *path, const char *what);
+time_t xtime(void);
+void xsigaction(int signo, const struct sigaction *sa);
+void xsigsetdefault(int signo);
+
+void xgettimeofday(struct timeval *tv_r);
+void xsetnonblock(int fd, int nonb);
+
+void check_isreg(const struct stat *stab, const char *path,
+ const char *what);
+void xfstat(int fd, struct stat *stab_r, const char *what);
+void xfstat_isreg(int fd, struct stat *stab_r,
+ const char *path, const char *what);
+void xlstat_isreg(const char *path, struct stat *stab,
+ int *enoent_r /* 0 means ENOENT is fatal */,
+ const char *what);
+int samefile(const struct stat *a, const struct stat *b);
+
+char *sanitise(const char *input, int len);
+
+static inline int isewouldblock(int errnoval) {
+ return errnoval==EWOULDBLOCK || errnoval==EAGAIN;
+}
+
+/*----- innduct.c -----*/
+
+void postfork(void);
+
+/*----- conn.c -----*/
+
+void conn_closefd(Conn *conn, const char *msgprefix);
+
+/*----- defer.c -----*/
+
+void poll_backlog_file(void);
+
+/*----- infile.c -----*/
+
+void filepoll(void);
+
+/*----- statemc.c -----*/
+
+sig_atomic_t terminate_sig_flag;
+
+/*----- xmit.c -----*/
+
+void inputfile_queue_check_expired(InputFile *ipf);
+
+/*----- external linkage for debug/dump only -----*/
+
+pid_t connecting_child;
+pid_t inndcomm_child;
+
+/*========== general operational variables ==========*/
+
+/* innduct.c */
+extern oop_source *loop;
+extern ConnList conns;
+extern char *path_lock, *path_flushing, *path_defer, *path_dump;
+extern char *globpat_backlog;
+extern pid_t self_pid;
+extern int *lowvol_perperiod;
+extern int lowvol_circptr;
+extern int lowvol_total; /* does not include current period */
+
+/* statemc.c */
+extern StateMachineState sms;
+extern int until_flush;
+extern InputFile *main_input_file, *flushing_input_file, *backlog_input_file;
+extern FILE *defer;
+extern int until_connect, until_backlog_nextscan;
+extern double accept_proportion;
+extern int nocheck, nocheck_reported, in_child;
+
+/* help.c */
+extern int simulate_flush;
+extern int logv_use_syslog;
+extern const char *logv_prefix;
+
+
+#endif /*INNDUCT_H*/
--- /dev/null
+/*========== handling responses from peer ==========*/
+
+static const oop_rd_style peer_rd_style= {
+ OOP_RD_DELIM_STRIP, '\n',
+ OOP_RD_NUL_FORBID,
+ OOP_RD_SHORTREC_FORBID
+};
+
+static void *peer_rd_err(oop_source *lp, oop_read *oread, oop_rd_event ev,
+ const char *errmsg, int errnoval,
+ const char *data, size_t recsz, void *conn_v) {
+ Conn *conn= conn_v;
+ connfail(conn, "error receiving from peer: %s", errmsg);
+ return OOP_CONTINUE;
+}
+
+static Article *article_reply_check(Conn *conn, const char *response,
+ int code_indicates_streaming,
+ int must_have_sent
+ /* 1:yes, -1:no, 0:dontcare */,
+ const char *sanitised_response) {
+ Article *art= LIST_HEAD(conn->sent);
+
+ if (!art) {
+ connfail(conn,
+ "peer gave unexpected response when no commands outstanding: %s",
+ sanitised_response);
+ return 0;
+ }
+
+ if (code_indicates_streaming) {
+ assert(!memchr(response, 0, 4)); /* ensured by peer_rd_ok */
+ if (!conn->stream) {
+ connfail(conn, "peer gave streaming response code "
+ " to IHAVE or subsequent body: %s", sanitised_response);
+ return 0;
+ }
+ const char *got_mid= response+4;
+ int got_midlen= strcspn(got_mid, " \n\r");
+ if (got_midlen<3 || got_mid[0]!='<' || got_mid[got_midlen-1]!='>') {
+ connfail(conn, "peer gave streaming response with syntactically invalid"
+ " messageid: %s", sanitised_response);
+ return 0;
+ }
+ if (got_midlen != art->midlen ||
+ memcmp(got_mid, art->messageid, got_midlen)) {
+ connfail(conn, "peer gave streaming response code to wrong article -"
+ " probable synchronisation problem; we offered: %s;"
+ " peer said: %s",
+ art->messageid, sanitised_response);
+ return 0;
+ }
+ } else {
+ if (conn->stream) {
+ connfail(conn, "peer gave non-streaming response code to"
+ " CHECK/TAKETHIS: %s", sanitised_response);
+ return 0;
+ }
+ }
+
+ if (must_have_sent>0 && art->state < art_Wanted) {
+ connfail(conn, "peer says article accepted but"
+ " we had not sent the body: %s", sanitised_response);
+ return 0;
+ }
+ if (must_have_sent<0 && art->state >= art_Wanted) {
+ connfail(conn, "peer says please sent the article but we just did: %s",
+ sanitised_response);
+ return 0;
+ }
+
+ Article *art_again= LIST_REMHEAD(conn->sent);
+ assert(art_again == art);
+ return art;
+}
+
+static void update_nocheck(int accepted) {
+ accept_proportion *= nocheck_decay;
+ accept_proportion += accepted * (1.0 - nocheck_decay);
+ int new_nocheck= accept_proportion >= nocheck_thresh;
+ if (new_nocheck && !nocheck_reported) {
+ notice("entering nocheck mode for the first time");
+ nocheck_reported= 1;
+ } else if (new_nocheck != nocheck) {
+ dbg("nocheck mode %s", new_nocheck ? "start" : "stop");
+ }
+ nocheck= new_nocheck;
+}
+
+static void article_done(Article *art, int whichcount) {
+ if (whichcount>=0 && !art->missing)
+ art->ipf->counts[art->state][whichcount]++;
+
+ if (whichcount == RC_accepted) update_nocheck(1);
+ else if (whichcount == RC_unwanted) update_nocheck(0);
+
+ InputFile *ipf= art->ipf;
+
+ while (art->blanklen) {
+ static const char spaces[]=
+ " "
+ " "
+ " "
+ " "
+ " "
+ " "
+ " "
+ " "
+ " ";
+ int nspaces= sizeof(spaces)-1;
+ int w= art->blanklen; if (w > nspaces) w= nspaces;
+ int r= pwrite(ipf->fd, spaces, w, art->offset);
+ if (r==-1) {
+ if (errno==EINTR) continue;
+ syscrash("failed to blank entry for %s (length %d at offset %lu) in %s",
+ art->messageid, art->blanklen,
+ (unsigned long)art->offset, ipf->path);
+ }
+ assert(r>=0 && r<=w);
+ art->blanklen -= w;
+ art->offset += w;
+ }
+
+ ipf->inprogress--;
+ assert(ipf->inprogress >= 0);
+ free(art);
+
+ if (!ipf->inprogress && ipf != main_input_file)
+ queue_check_input_done();
+}
+
+static void *peer_rd_ok(oop_source *lp, oop_read *oread, oop_rd_event ev,
+ const char *errmsg, int errnoval,
+ const char *data, size_t recsz, void *conn_v) {
+ Conn *conn= conn_v;
+
+ if (ev == OOP_RD_EOF) {
+ connfail(conn, "unexpected EOF from peer");
+ return OOP_CONTINUE;
+ }
+ assert(ev == OOP_RD_OK);
+
+ char *sani= sanitise(data,-1);
+
+ char *ep;
+ unsigned long code= strtoul(data, &ep, 10);
+ if (ep != data+3 || *ep != ' ' || data[0]=='0') {
+ connfail(conn, "badly formatted response from peer: %s", sani);
+ return OOP_CONTINUE;
+ }
+
+ int busy= conn_busy(conn);
+
+ if (conn->quitting) {
+ if (code!=205 && code!=400) {
+ connfail(conn, "peer gave unexpected response to QUIT (%s): %s",
+ conn->quitting, sani);
+ } else {
+ LIST_REMOVE(conns,conn);
+ notice("C%d (now %d) idle connection closed (%s)",
+ conn->fd, conns.count, conn->quitting);
+ assert(!busy);
+ conn_dispose(conn);
+ }
+ return OOP_CONTINUE;
+ }
+
+ conn->since_activity= 0;
+ Article *art;
+
+#define GET_ARTICLE(musthavesent) do{ \
+ art= article_reply_check(conn, data, code_streaming, musthavesent, sani); \
+ if (!art) return OOP_CONTINUE; /* reply_check has failed the conn */ \
+ }while(0)
+
+#define ARTICLE_DEALTWITH(streaming,musthavesent,how) do{ \
+ code_streaming= (streaming); \
+ GET_ARTICLE(musthavesent); \
+ article_done(art, RC_##how); \
+ goto dealtwith; \
+ }while(0)
+
+#define PEERBADMSG(m) do { \
+ connfail(conn, m ": %s", sani); return OOP_CONTINUE; \
+ }while(0)
+
+ int code_streaming= 0;
+
+ switch (code) {
+
+ default: PEERBADMSG("peer sent unexpected message");
+
+ case 400:
+ if (busy)
+ PEERBADMSG("peer timed us out or stopped accepting articles");
+
+ LIST_REMOVE(conns,conn);
+ notice("C%d (now %d) idle connection closed by peer",
+ conns.count, conn->fd);
+ conn_dispose(conn);
+ return OOP_CONTINUE;
+
+ case 435: ARTICLE_DEALTWITH(0,0,unwanted); /* IHAVE says they have it */
+ case 438: ARTICLE_DEALTWITH(1,0,unwanted); /* CHECK/TAKETHIS: they have it */
+
+ case 235: ARTICLE_DEALTWITH(0,1,accepted); /* IHAVE says thanks */
+ case 239: ARTICLE_DEALTWITH(1,1,accepted); /* TAKETHIS says thanks */
+
+ case 437: ARTICLE_DEALTWITH(0,0,rejected); /* IHAVE says rejected */
+ case 439: ARTICLE_DEALTWITH(1,0,rejected); /* TAKETHIS says rejected */
+
+ case 238: /* CHECK says send it */
+ code_streaming= 1;
+ case 335: /* IHAVE says send it */
+ GET_ARTICLE(-1);
+ assert(art->state == art_Unchecked);
+ art->ipf->counts[art->state][RC_accepted]++;
+ art->state= art_Wanted;
+ LIST_ADDTAIL(conn->priority, art);
+ break;
+
+ case 431: /* CHECK or TAKETHIS says try later */
+ code_streaming= 1;
+ case 436: /* IHAVE says try later */
+ GET_ARTICLE(0);
+ article_defer(art, RC_deferred);
+ break;
+
+ }
+dealtwith:
+
+ conn_maybe_write(conn);
+ check_assign_articles();
+ return OOP_CONTINUE;
+}
+
+
--- /dev/null
+
+
+/* statemc_init initialises */
+StateMachineState sms;
+int until_flush;
+InputFile *main_input_file, *flushing_input_file, *backlog_input_file;
+FILE *defer;
+
+/* initialisation to 0 is good */
+int until_connect, until_backlog_nextscan;
+double accept_proportion;
+int nocheck, nocheck_reported, in_child;
+sig_atomic_t terminate_sig_flag;
+
+
+static void startup_set_input_file(InputFile *f) {
+ assert(!main_input_file);
+ main_input_file= f;
+ inputfile_reading_start(f);
+}
+
+static void statemc_lock(void) {
+ int lockfd;
+ struct stat stab, stabf;
+
+ for (;;) {
+ lockfd= open(path_lock, O_CREAT|O_RDWR, 0600);
+ if (lockfd<0) sysdie("open lockfile %s", path_lock);
+
+ struct flock fl;
+ memset(&fl,0,sizeof(fl));
+ fl.l_type= F_WRLCK;
+ fl.l_whence= SEEK_SET;
+ int r= fcntl(lockfd, F_SETLK, &fl);
+ if (r==-1) {
+ if (errno==EACCES || isewouldblock(errno)) {
+ if (quiet_multiple) exit(0);
+ die("another duct holds the lockfile");
+ }
+ sysdie("fcntl F_SETLK lockfile %s", path_lock);
+ }
+
+ xfstat_isreg(lockfd, &stabf, path_lock, "lockfile");
+ int lock_noent;
+ xlstat_isreg(path_lock, &stab, &lock_noent, "lockfile");
+
+ if (!lock_noent && samefile(&stab, &stabf))
+ break;
+
+ xclose(lockfd, "stale lockfile ", path_lock);
+ }
+
+ FILE *lockfile= fdopen(lockfd, "w");
+ if (!lockfile) syscrash("fdopen lockfile");
+
+ int r= ftruncate(lockfd, 0);
+ if (r) syscrash("truncate lockfile to write new info");
+
+ if (fprintf(lockfile, "pid %ld\nsite %s\nfeedfile %s\nfqdn %s\n",
+ (unsigned long)self_pid,
+ sitename, feedfile, remote_host) == EOF ||
+ fflush(lockfile))
+ sysdie("write info to lockfile %s", path_lock);
+
+ dbg("startup: locked");
+}
+
+static void statemc_init(void) {
+ struct stat stabdefer;
+
+ search_backlog_file();
+
+ int defer_noent;
+ xlstat_isreg(path_defer, &stabdefer, &defer_noent, "defer file");
+ if (defer_noent) {
+ dbg("startup: ductdefer ENOENT");
+ } else {
+ dbg("startup: ductdefer nlink=%ld", (long)stabdefer.st_nlink);
+ switch (stabdefer.st_nlink==1) {
+ case 1:
+ open_defer(); /* so that we will later close it and rename it */
+ break;
+ case 2:
+ xunlink(path_defer, "stale defer file link"
+ " (presumably hardlink to backlog file)");
+ break;
+ default:
+ crash("defer file %s has unexpected link count %d",
+ path_defer, stabdefer.st_nlink);
+ }
+ }
+
+ struct stat stab_f, stab_d;
+ int noent_f;
+
+ InputFile *file_d= open_input_file(path_flushing);
+ if (file_d) xfstat_isreg(file_d->fd, &stab_d, path_flushing,"flushing file");
+
+ xlstat_isreg(feedfile, &stab_f, &noent_f, "feedfile");
+
+ if (!noent_f && file_d && samefile(&stab_f, &stab_d)) {
+ dbg("startup: F==D => Hardlinked");
+ xunlink(feedfile, "feed file (during startup)"); /* => Moved */
+ noent_f= 1;
+ }
+
+ if (noent_f) {
+ dbg("startup: F ENOENT => Moved");
+ if (file_d) startup_set_input_file(file_d);
+ spawn_inndcomm_flush("feedfile missing at startup");
+ /* => Flushing, sms:=FLUSHING */
+ } else {
+ if (file_d) {
+ dbg("startup: F!=D => Separated");
+ startup_set_input_file(file_d);
+ flushing_input_file= main_input_file;
+ main_input_file= open_input_file(feedfile);
+ if (!main_input_file) crash("feedfile vanished during startup");
+ SMS(SEPARATED, max_separated_periods,
+ "found both old and current feed files");
+ } else {
+ dbg("startup: F exists, D ENOENT => Normal");
+ InputFile *file_f= open_input_file(feedfile);
+ if (!file_f) crash("feed file vanished during startup");
+ startup_set_input_file(file_f);
+ SMS(NORMAL, spontaneous_flush_periods, "normal startup");
+ }
+ }
+}
+
+static void statemc_start_flush(const char *why) { /* Normal => Flushing */
+ assert(sms == sm_NORMAL);
+
+ dbg("starting flush (%s) (%lu >?= %lu) (%d)",
+ why,
+ (unsigned long)(main_input_file ? main_input_file->offset : 0),
+ (unsigned long)target_max_feedfile_size,
+ until_flush);
+
+ int r= link(feedfile, path_flushing);
+ if (r) sysdie("link feedfile %s to flushing file %s",
+ feedfile, path_flushing);
+ /* => Hardlinked */
+
+ xunlink(feedfile, "old feedfile link");
+ /* => Moved */
+
+ spawn_inndcomm_flush(why); /* => Flushing FLUSHING */
+}
+
+static int trigger_flush_ok(const char *why) {
+ switch (sms) {
+
+ case sm_NORMAL:
+ statemc_start_flush(why ? why : "periodic");
+ return 1; /* Normal => Flushing; => FLUSHING */
+
+ case sm_FLUSHFAILED:
+ spawn_inndcomm_flush(why ? why : "retry");
+ return 1; /* Moved => Flushing; => FLUSHING */
+
+ case sm_SEPARATED:
+ case sm_DROPPING:
+ warn("abandoning old feedfile after flush (%s), autodeferring",
+ why ? why : "took too long to complete");
+ assert(flushing_input_file);
+ autodefer_input_file(flushing_input_file);
+ return 1;
+
+ default:
+ return 0;
+ }
+}
+
+static void statemc_period_poll(void) {
+ if (!until_flush) return;
+ until_flush--;
+ assert(until_flush>=0);
+
+ if (until_flush) return;
+ int ok= trigger_flush_ok(0);
+ assert(ok);
+}
+
+static int inputfile_is_done(InputFile *ipf) {
+ if (!ipf) return 0;
+ if (ipf->inprogress) return 0; /* new article in the meantime */
+ if (ipf->rd) return 0; /* not had EOF */
+ return 1;
+}
+
+static void notice_processed(InputFile *ipf, int completed,
+ const char *what, const char *spec) {
+ if (!ipf) return; /* allows preterminate to be lazy */
+
+#define RCI_NOTHING(x) /* nothing */
+#define RCI_TRIPLE_FMT(x) " " #x "=" RCI_TRIPLE_FMT_BASE
+#define RCI_TRIPLE_VALS(x) , RCI_TRIPLE_VALS_BASE(ipf->counts, [RC_##x])
+
+#define CNT(art,rc) (ipf->counts[art_##art][RC_##rc])
+
+ char *inprog= completed
+ ? xasprintf("%s","") /* GCC produces a stupid warning for printf("") ! */
+ : xasprintf(" inprogress=%ld", ipf->inprogress);
+ char *autodefer= ipf->autodefer >= 0
+ ? xasprintf(" autodeferred=%ld", ipf->autodefer)
+ : xasprintf("%s","");
+
+ info("%s %s%s read=%d (+bl=%d,+err=%d)%s%s"
+ " missing=%d offered=%d (ch=%d,nc=%d) accepted=%d (ch=%d,nc=%d)"
+ RESULT_COUNTS(RCI_NOTHING, RCI_TRIPLE_FMT)
+ ,
+ completed?"completed":"processed", what, spec,
+ ipf->readcount_ok, ipf->readcount_blank, ipf->readcount_err,
+ inprog, autodefer, ipf->count_nooffer_missing,
+ CNT(Unchecked,sent) + CNT(Unsolicited,sent)
+ , CNT(Unchecked,sent), CNT(Unsolicited,sent),
+ CNT(Wanted,accepted) + CNT(Unsolicited,accepted)
+ , CNT(Wanted,accepted), CNT(Unsolicited,accepted)
+ RESULT_COUNTS(RCI_NOTHING, RCI_TRIPLE_VALS)
+ );
+
+ free(inprog);
+ free(autodefer);
+
+#undef CNT
+}
+
+static void statemc_check_backlog_done(void) {
+ InputFile *ipf= backlog_input_file;
+ if (!inputfile_is_done(ipf)) return;
+
+ const char *slash= strrchr(ipf->path, '/');
+ const char *leaf= slash ? slash+1 : ipf->path;
+ const char *under= strchr(slash, '_');
+ const char *rest= under ? under+1 : leaf;
+ if (!strncmp(rest,"backlog",7)) rest += 7;
+ notice_processed(ipf,1,"backlog ",rest);
+
+ close_input_file(ipf);
+ if (unlink(ipf->path)) {
+ if (errno != ENOENT)
+ syscrash("could not unlink processed backlog file %s", ipf->path);
+ warn("backlog file %s vanished while we were reading it"
+ " so we couldn't remove it (but it's done now, anyway)",
+ ipf->path);
+ }
+ free(ipf);
+ backlog_input_file= 0;
+ search_backlog_file();
+ return;
+}
+
+static void statemc_check_flushing_done(void) {
+ InputFile *ipf= flushing_input_file;
+ if (!inputfile_is_done(ipf)) return;
+
+ assert(sms==sm_SEPARATED || sms==sm_DROPPING);
+
+ notice_processed(ipf,1,"feedfile","");
+
+ close_defer();
+
+ xunlink(path_flushing, "old flushing file");
+
+ close_input_file(flushing_input_file);
+ free(flushing_input_file);
+ flushing_input_file= 0;
+
+ if (sms==sm_SEPARATED) {
+ notice("flush complete");
+ SMS(NORMAL, spontaneous_flush_periods, "flush complete");
+ } else if (sms==sm_DROPPING) {
+ SMS(DROPPED, max_separated_periods, "old flush complete");
+ search_backlog_file();
+ notice("feed dropped, but will continue until backlog is finished");
+ }
+}
+
+static void *statemc_check_input_done(oop_source *lp, struct timeval now,
+ void *u) {
+ /* main input file may be idle but if so that's because
+ * we haven't got to it yet, but that doesn't mean it's really done */
+ statemc_check_flushing_done();
+ statemc_check_backlog_done();
+ return OOP_CONTINUE;
+}
+
+static void queue_check_input_done(void) {
+ loop->on_time(loop, OOP_TIME_NOW, statemc_check_input_done, 0);
+}
+
+static void statemc_setstate(StateMachineState newsms, int periods,
+ const char *forlog, const char *why) {
+ sms= newsms;
+ until_flush= periods;
+
+ const char *xtra= "";
+ switch (sms) {
+ case sm_FLUSHING:
+ case sm_FLUSHFAILED:
+ if (!main_input_file) xtra= "-ABSENT";
+ break;
+ case sm_SEPARATED:
+ case sm_DROPPING:
+ xtra= flushing_input_file->rd ? "-1" : "-2";
+ break;
+ default:;
+ }
+
+ if (periods) {
+ info("state %s%s[%d] %s",forlog,xtra,periods,why);
+ } else {
+ info("state %s%s %s",forlog,xtra,why);
+ }
+}
+
+/*========== flushing the feed ==========*/
+
+pid_t inndcomm_child;
+static int inndcomm_sentinel_fd;
+
+static void *inndcomm_event(oop_source *lp, int fd, oop_event e, void *u) {
+ assert(inndcomm_child);
+ assert(fd == inndcomm_sentinel_fd);
+ int status= xwaitpid(&inndcomm_child, "inndcomm");
+ inndcomm_child= 0;
+
+ cancel_fd_read_except(fd);
+ xclose_perhaps(&fd, "inndcomm sentinel pipe",0);
+ inndcomm_sentinel_fd= 0;
+
+ assert(!flushing_input_file);
+
+ if (WIFEXITED(status)) {
+ switch (WEXITSTATUS(status)) {
+
+ case INNDCOMMCHILD_ESTATUS_FAIL:
+ goto failed;
+
+ case INNDCOMMCHILD_ESTATUS_NONESUCH:
+ notice("feed has been dropped by innd, finishing up");
+ flushing_input_file= main_input_file;
+ tailing_make_readable(flushing_input_file);
+ /* we probably previously returned EAGAIN from our fake read method
+ * when in fact we were at EOF, so signal another readable event
+ * so we actually see the EOF */
+
+ main_input_file= 0;
+
+ if (flushing_input_file) {
+ SMS(DROPPING, max_separated_periods,
+ "feed dropped by innd, but must finish last flush");
+ } else {
+ close_defer();
+ SMS(DROPPED, 0, "feed dropped by innd");
+ search_backlog_file();
+ }
+ return OOP_CONTINUE;
+
+ case 0:
+ /* as above */
+ flushing_input_file= main_input_file;
+ tailing_make_readable(flushing_input_file);
+
+ main_input_file= open_input_file(feedfile);
+ if (!main_input_file)
+ crash("flush succeeded but feedfile %s does not exist!"
+ " (this probably means feedfile does not correspond"
+ " to site %s in newsfeeds)", feedfile, sitename);
+
+ if (flushing_input_file) {
+ SMS(SEPARATED, max_separated_periods, "flush complete");
+ } else {
+ close_defer();
+ SMS(NORMAL, spontaneous_flush_periods, "recovery flush complete");
+ }
+ return OOP_CONTINUE;
+
+ default:
+ goto unexpected_exitstatus;
+
+ }
+ } else if (WIFSIGNALED(status) && WTERMSIG(status) == SIGALRM) {
+ warn("flush timed out trying to talk to innd");
+ goto failed;
+ } else {
+ unexpected_exitstatus:
+ report_child_status("inndcomm child", status);
+ }
+
+ failed:
+ SMS(FLUSHFAILED, flushfail_retry_periods, "flush failed, will retry");
+ return OOP_CONTINUE;
+}
+
+static void inndcommfail(const char *what) {
+ syswarn("error communicating with innd: %s failed: %s", what, ICCfailure);
+ exit(INNDCOMMCHILD_ESTATUS_FAIL);
+}
+
+void spawn_inndcomm_flush(const char *why) { /* Moved => Flushing */
+ int pipefds[2];
+
+ notice("flushing %s",why);
+
+ assert(sms==sm_NORMAL || sms==sm_FLUSHFAILED);
+ assert(!inndcomm_child);
+ assert(!inndcomm_sentinel_fd);
+
+ if (pipe(pipefds)) sysdie("create pipe for inndcomm child sentinel");
+
+ inndcomm_child= xfork("inndcomm child");
+
+ if (!inndcomm_child) {
+ const char *flushargv[2]= { sitename, 0 };
+ char *reply;
+ int r;
+
+ xclose(pipefds[0], "(in child) inndcomm sentinel parent's end",0);
+ /* parent spots the autoclose of pipefds[1] when we die or exit */
+
+ if (simulate_flush>=0) {
+ warn("SIMULATING flush child status %d", simulate_flush);
+ if (simulate_flush>128) raise(simulate_flush-128);
+ else exit(simulate_flush);
+ }
+
+ alarm(inndcomm_flush_timeout);
+ r= ICCopen(); if (r) inndcommfail("connect");
+ r= ICCcommand('f',flushargv,&reply); if (r<0) inndcommfail("transmit");
+ if (!r) exit(0); /* yay! */
+
+ if (!strcmp(reply, "1 No such site")) exit(INNDCOMMCHILD_ESTATUS_NONESUCH);
+ syswarn("innd ctlinnd flush failed: innd said %s", reply);
+ exit(INNDCOMMCHILD_ESTATUS_FAIL);
+ }
+
+ simulate_flush= -1;
+
+ xclose(pipefds[1], "inndcomm sentinel child's end",0);
+ inndcomm_sentinel_fd= pipefds[0];
+ assert(inndcomm_sentinel_fd);
+ on_fd_read_except(inndcomm_sentinel_fd, inndcomm_event);
+
+ SMS(FLUSHING, 0, why);
+}
+
+/*---------- shutdown and signal handling ----------*/
+
+static void preterminate(void) {
+ if (in_child) return;
+ notice_processed(main_input_file,0,"feedfile","");
+ notice_processed(flushing_input_file,0,"flushing","");
+ if (backlog_input_file)
+ notice_processed(backlog_input_file,0, "backlog file ",
+ backlog_input_file->path);
+}
+
+static int signal_self_pipe[2];
+
+static void raise_default(int signo) {
+ xsigsetdefault(signo);
+ raise(signo);
+ abort();
+}
+
+static void *sigarrived_event(oop_source *lp, int fd, oop_event e, void *u) {
+ assert(fd=signal_self_pipe[0]);
+ char buf[PIPE_BUF];
+ int r= read(signal_self_pipe[0], buf, sizeof(buf));
+ if (r<0 && !isewouldblock(errno))
+ syscrash("failed to read signal self pipe");
+ if (r==0) crash("eof on signal self pipe");
+ if (terminate_sig_flag) {
+ preterminate();
+ notice("terminating (%s)", strsignal(terminate_sig_flag));
+ raise_default(terminate_sig_flag);
+ }
+ return OOP_CONTINUE;
+}
+
+static void sigarrived_handler(int signum) {
+ static char x;
+ switch (signum) {
+ case SIGTERM:
+ case SIGINT:
+ if (!terminate_sig_flag) terminate_sig_flag= signum;
+ break;
+ default:
+ abort();
+ }
+ write(signal_self_pipe[1],&x,1);
+}
+
+static void init_signals(void) {
+ if (signal(SIGPIPE, SIG_IGN) == SIG_ERR)
+ syscrash("could not ignore SIGPIPE");
+
+ if (pipe(signal_self_pipe)) sysdie("create self-pipe for signals");
+
+ xsetnonblock(signal_self_pipe[0],1);
+ xsetnonblock(signal_self_pipe[1],1);
+
+ struct sigaction sa;
+ memset(&sa,0,sizeof(sa));
+ sa.sa_handler= sigarrived_handler;
+ sa.sa_flags= SA_RESTART;
+ xsigaction(SIGTERM,&sa);
+ xsigaction(SIGINT,&sa);
+
+ on_fd_read_except(signal_self_pipe[0], sigarrived_event);
+}
+
--- /dev/null
+/*---------- assigning articles to conns, and transmitting ----------*/
+
+static Article *dequeue_from(int peek, InputFile *ipf) {
+ if (!ipf) return 0;
+ if (peek) return LIST_HEAD(ipf->queue);
+
+ Article *art= LIST_REMHEAD(ipf->queue);
+ if (!art) return 0;
+ check_reading_pause_resume(ipf);
+ return art;
+}
+
+static Article *dequeue(int peek) {
+ Article *art;
+ art= dequeue_from(peek, flushing_input_file); if (art) return art;
+ art= dequeue_from(peek, backlog_input_file); if (art) return art;
+ art= dequeue_from(peek, main_input_file); if (art) return art;
+ return 0;
+}
+
+static void check_assign_articles(void) {
+ for (;;) {
+ if (!dequeue(1))
+ break;
+
+ Conn *walk, *use=0;
+ int spare=0, inqueue=0;
+
+ /* Find a connection to offer this article. We prefer a busy
+ * connection to an idle one, provided it's not full. We take the
+ * first (oldest) and since that's stable, it will mean we fill up
+ * connections in order. That way if we have too many
+ * connections, the spare ones will go away eventually.
+ */
+ FOR_CONN(walk) {
+ if (walk->quitting) continue;
+ inqueue= walk->sent.count + walk->priority.count
+ + walk->waiting.count;
+ spare= walk->max_queue - inqueue;
+ assert(inqueue <= max_queue_per_conn);
+ assert(spare >= 0);
+ if (inqueue==0) /*idle*/ { if (!use) use= walk; }
+ else if (spare>0) /*working*/ { use= walk; break; }
+ }
+ if (use) {
+ if (!inqueue) use->since_activity= 0; /* reset idle counter */
+ while (spare>0) {
+ Article *art= dequeue(0);
+ if (!art) break;
+ LIST_ADDTAIL(use->waiting, art);
+ lowvol_perperiod[lowvol_circptr]++;
+ spare--;
+ }
+ conn_maybe_write(use);
+ } else if (allow_connect_start()) {
+ connect_start();
+ break;
+ } else {
+ break;
+ }
+ }
+}
+
+static void *conn_writeable(oop_source *l, int fd, oop_event ev, void *u) {
+ conn_maybe_write(u);
+ return OOP_CONTINUE;
+}
+
+static void conn_maybe_write(Conn *conn) {
+ for (;;) {
+ conn_make_some_xmits(conn);
+ if (!conn->xmitu) {
+ loop->cancel_fd(loop, conn->fd, OOP_WRITE);
+ conn->oopwriting= 0;
+ return;
+ }
+
+ void *rp= conn_write_some_xmits(conn);
+ if (rp==OOP_CONTINUE) {
+ if (!conn->oopwriting) {
+ loop->on_fd(loop, conn->fd, OOP_WRITE, conn_writeable, conn);
+ conn->oopwriting= 1;
+ }
+ return;
+ } else if (rp==OOP_HALT) {
+ return;
+ } else if (!rp) {
+ /* transmitted everything */
+ } else {
+ abort();
+ }
+ }
+}
+
+/*---------- expiry, flow control and deferral ----------*/
+
+/*
+ * flow control notes
+ * to ensure articles go away eventually
+ * separate queue for each input file
+ * queue expiry
+ * every period, check head of backlog queue for expiry with SMretrieve
+ * if too old: discard, and check next article
+ * also check every backlog article as we read it
+ * flush expiry
+ * after too long in SEPARATED/DROPPING ie Separated/Finishing/Dropping
+ * one-off: eat queued articles from flushing and write them to defer
+ * one-off: connfail all connections which have any articles from flushing
+ * newly read articles from flushing go straight to defer
+ * this should take care of it and get us out of this state
+ * to avoid filling up ram needlessly
+ * input control
+ * limit number of queued articles for each ipf
+ * pause/resume inputfile tailing
+ */
+
+static void check_reading_pause_resume(InputFile *ipf) {
+ if (ipf->queue.count >= max_queue_per_ipf)
+ inputfile_reading_pause(ipf);
+ else
+ inputfile_reading_resume(ipf);
+}
+
+static void article_defer(Article *art /* not on a queue */, int whichcount) {
+ open_defer();
+ if (fprintf(defer, "%s %s\n", TokenToText(art->token), art->messageid) <0
+ || fflush(defer))
+ sysdie("write to defer file %s",path_defer);
+ article_done(art, whichcount);
+}
+
+static int article_check_expired(Article *art /* must be queued, not conn */) {
+ ARTHANDLE *artdata= SMretrieve(art->token, RETR_STAT);
+ if (artdata) { SMfreearticle(artdata); return 0; }
+
+ LIST_REMOVE(art->ipf->queue, art);
+ art->missing= 1;
+ art->ipf->count_nooffer_missing++;
+ article_done(art,-1);
+ return 1;
+}
+
+void inputfile_queue_check_expired(InputFile *ipf) {
+ if (!ipf) return;
+
+ for (;;) {
+ Article *art= LIST_HEAD(ipf->queue);
+ int expd= article_check_expired(art);
+ if (!expd) break;
+ }
+ check_reading_pause_resume(ipf);
+}
+
+static void article_autodefer(InputFile *ipf, Article *art) {
+ ipf->autodefer++;
+ article_defer(art,-1);
+}
+
+static int has_article_in(const ArticleList *al, InputFile *ipf) {
+ Article *art;
+ for (art=LIST_HEAD(*al); art; art=LIST_NEXT(art))
+ if (art->ipf == ipf) return 1;
+ return 0;
+}
+
+static void autodefer_input_file_articles(InputFile *ipf) {
+ Article *art;
+ while ((art= LIST_REMHEAD(ipf->queue)))
+ article_autodefer(ipf, art);
+}
+
+static void autodefer_input_file(InputFile *ipf) {
+ static const char *const abandon= "stuck";
+ ipf->autodefer= 0;
+
+ autodefer_input_file_articles(ipf);
+
+ if (ipf->inprogress) {
+ Conn *walk;
+ FOR_CONN(walk) {
+ if (has_article_in(&walk->waiting, ipf) ||
+ has_article_in(&walk->priority, ipf) ||
+ has_article_in(&walk->sent, ipf))
+ walk->quitting= abandon;
+ }
+ while (ipf->inprogress) {
+ FOR_CONN(walk)
+ if (walk->quitting == abandon) goto found;
+ abort(); /* where are they ?? */
+
+ found:
+ connfail(walk, "connection is stuck or crawling,"
+ " and we need to finish flush");
+ autodefer_input_file_articles(ipf);
+ }
+ }
+
+ check_reading_pause_resume(ipf);
+}
+
+/*========== article transmission ==========*/
+
+static XmitDetails *xmit_core(Conn *conn, const char *data, int len,
+ XmitKind kind) { /* caller must then fill in details */
+ struct iovec *v= &conn->xmit[conn->xmitu];
+ XmitDetails *d= &conn->xmitd[conn->xmitu++];
+ v->iov_base= (char*)data;
+ v->iov_len= len;
+ d->kind= kind;
+ return d;
+}
+
+static void xmit_noalloc(Conn *conn, const char *data, int len) {
+ xmit_core(conn,data,len, xk_Const);
+}
+#define XMIT_LITERAL(lit) (xmit_noalloc(conn, (lit), sizeof(lit)-1))
+
+static void xmit_artbody(Conn *conn, ARTHANDLE *ah /* consumed */) {
+ XmitDetails *d= xmit_core(conn, ah->data, ah->len, xk_Artdata);
+ d->info.sm_art= ah;
+}
+
+static void xmit_free(XmitDetails *d) {
+ switch (d->kind) {
+ case xk_Artdata: SMfreearticle(d->info.sm_art); break;
+ case xk_Const: break;
+ default: abort();
+ }
+}
+
+static void *conn_write_some_xmits(Conn *conn) {
+ /* return values:
+ * 0: nothing more to write, no need to call us again
+ * OOP_CONTINUE: more to write but fd not writeable
+ * OOP_HALT: disaster, have destroyed conn
+ */
+ for (;;) {
+ int count= conn->xmitu;
+ if (!count) return 0;
+
+ if (count > IOV_MAX) count= IOV_MAX;
+ ssize_t rs= writev(conn->fd, conn->xmit, count);
+ if (rs < 0) {
+ if (isewouldblock(errno)) return OOP_CONTINUE;
+ connfail(conn, "write failed: %s", strerror(errno));
+ return OOP_HALT;
+ }
+ assert(rs > 0);
+
+ int done;
+ for (done=0; rs; ) {
+ assert(done<conn->xmitu);
+ struct iovec *vp= &conn->xmit[done];
+ XmitDetails *dp= &conn->xmitd[done];
+ assert(vp->iov_len <= SSIZE_MAX);
+ if ((size_t)rs >= vp->iov_len) {
+ rs -= vp->iov_len;
+ xmit_free(dp); /* vp->iov_len -= vp->iov_len, etc. */
+ done++;
+ } else {
+ vp->iov_base= (char*)vp->iov_base + rs;
+ vp->iov_len -= rs;
+ break; /* rs -= rs */
+ }
+ }
+ int newu= conn->xmitu - done;
+ memmove(conn->xmit, conn->xmit + done, newu * sizeof(*conn->xmit));
+ memmove(conn->xmitd, conn->xmitd + done, newu * sizeof(*conn->xmitd));
+ conn->xmitu= newu;
+ }
+}
+
+static void conn_make_some_xmits(Conn *conn) {
+ for (;;) {
+ if (conn->xmitu+5 > CONNIOVS)
+ break;
+
+ Article *art= LIST_REMHEAD(conn->priority);
+ if (!art) art= LIST_REMHEAD(conn->waiting);
+ if (!art) break;
+
+ if (art->state >= art_Wanted || (conn->stream && nocheck)) {
+ /* actually send it */
+
+ ARTHANDLE *artdata= SMretrieve(art->token, RETR_ALL);
+
+ art->state=
+ art->state == art_Unchecked ? art_Unsolicited :
+ art->state == art_Wanted ? art_Wanted :
+ (abort(),-1);
+
+ if (!artdata) art->missing= 1;
+ art->ipf->counts[art->state][ artdata ? RC_sent : RC_missing ]++;
+
+ if (conn->stream) {
+ if (artdata) {
+ XMIT_LITERAL("TAKETHIS ");
+ xmit_noalloc(conn, art->messageid, art->midlen);
+ XMIT_LITERAL("\r\n");
+ xmit_artbody(conn, artdata);
+ } else {
+ article_done(art, -1);
+ continue;
+ }
+ } else {
+ /* we got 235 from IHAVE */
+ if (artdata) {
+ xmit_artbody(conn, artdata);
+ } else {
+ XMIT_LITERAL(".\r\n");
+ }
+ }
+
+ LIST_ADDTAIL(conn->sent, art);
+
+ } else {
+ /* check it */
+
+ if (conn->stream)
+ XMIT_LITERAL("CHECK ");
+ else
+ XMIT_LITERAL("IHAVE ");
+ xmit_noalloc(conn, art->messageid, art->midlen);
+ XMIT_LITERAL("\r\n");
+
+ assert(art->state == art_Unchecked);
+ art->ipf->counts[art->state][RC_sent]++;
+ LIST_ADDTAIL(conn->sent, art);
+ }
+ }
+}
+
~ian / innduct.git / commitdiff