/* * 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 * .... * * 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.. * 431'd articles, ready for innxmit or duct * created (link/mv) by duct * site.name_backlog (where 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 * */ /*----- general definitions, probably best not changed -----*/ #define PERIOD_SECONDS 60 #define CONNCHILD_ESTATUS_STREAM 4 #define CONNCHILD_ESTATUS_NOSTREAM 5 #define INNDCOMMCHILD_ESTATUS_FAIL 6 #define INNDCOMMCHILD_ESTATUS_NONESUCH 7 /*----- configuration options -----*/ static char *sitename, *feedfile; static int max_connections=10, max_queue_per_conn=200; static int connection_setup_timeout=200, port=119, try_stream=1; static int inndcomm_flush_timeout=100, quiet_if_locked=0; static const char *remote_host; static int reconnect_delay_periods, flushfail_retry_periods, open_wait_periods; static int backlog_retry_minperiods, backlog_spontaneous_rescan_periods; static const char *inndconffile; static double accept_proportion; static double nocheck_thresh_pct= 95.0; static double nocheck_thresh; /* computed in main from _pct */ static double nocheck_decay_articles= 100; /* converted to _decay */ static double nocheck_decay; /* computed in main from _articles */ static int nocheck, nocheck_reported; /*----- doubly linked lists -----*/ #define ISNODE(T) T *next, *back; #define LIST(T) struct { T *head, *tail, *tailpred; int count; } #define NODE(n) ((struct node*)&(n)->head) #define LIST_ADDHEAD(l,n) \ (list_addhead((struct list*)&(l), NODE((n))), (void)(l).count++) #define LIST_ADDTAIL(l,n) \ (list_addtail((struct list*)&(l), NODE((n))), (void)(l).count++) #define LIST_REMHEAD(l) \ ((l).count ? ((l).count--, (void*)list_remhead((struct list*)&(l))) : 0) #define LIST_REMTAIL(l) \ ((l).count ? ((l).count--, (void*)list_remtail((struct list*)&(l))) : 0) #define LIST_REMOVE(l,n) \ (list_remove(NODE((n))), (void)(l).count--) #define LIST_INSERT(l,n,pred) \ (list_insert((struct list*)&(l), NODE((n)), NODE((pred))), (void)(l).count++) /*----- statistics -----*/ #define RESULT_COUNTS \ RC(offered) \ RC(sent) \ RC(unwanted) \ RC(accepted) \ RC(rejected) \ RC(deferred) typedef enum { #define RC_INDEX(x) RCI_##x RESULT_COUNTS RCI_max } ResultCountIndex; typedef struct { int articles[2 /* checked */][RCI_max]; } Counts; /*----- transmission buffers -----*/ #define CONNIOVS 128 typedef enum { xk_Malloc, xk_Const, xk_Artdata; } XmitKind; typedef struct { XmitKind kind; union { char *malloc_tofree; ARTHANDLE *sm_art; } info; } XmitDetails; /*----- core operational data structure types -----*/ struct Article { int midlen; int checked; InputFile *ipf; TOKEN token; off_t offset; int blanklen; char messageid[1]; }; typedef struct InputFile { /* This is an instance of struct oop_readable */ struct oop_readable readable; /* first */ oop_readable_call *readable_callback; void *readable_callback_user; int fd; struct Filemon_Perfile *filemon; oop_read *rd; long inprogress; /* no. of articles read but not processed */ off_t offset; Counts counts; char path[]; } InputFile; #define SMS_LIST(X) \ X(NORMAL) \ X(FLUSHING) \ X(FLUSHFAILED) \ X(SEPARATED) \ X(DROPPING) \ X(DROPPED) typedef enum { #define SMS_DEF_ENUM(s) sm_##s, SMS_LIST(SMS_DEF_ENUM) } StateMachineState; static const char *sms_names[]= { #define SMS_DEF_NAME(s) #s , SMS_LIST(SMS_DEF_NAME) 0 }; struct Conn { ISNODE(Conn); int fd, max_queue, stream; LIST(Article) queue; /* not yet told peer, or CHECK said send it */ LIST(Article) sent; /* offered/transmitted - in xmit or waiting reply */ struct iovec xmit[CONNIOVS]; XmitDetails xmitd[CONNIOVS]; int xmitu; }; /*----- operational variables -----*/ static int nconns; static LIST(Conn) idle, working, full; static LIST(Article) *queue; static char *path_lock, *path_flushing, *path_defer; #define SMS(newstate, periods, why) \ (statemc_setstate(sm_##newstate,(periods),#newstate,(why))) static StateMachineState sms; static FILE *defer; static InputFile *main_input_file, *flushing_input_file, *backlog_input_file; static int sm_period_counter; /*----- function predeclarations -----*/ static void conn_check_work(Conn *conn); static int filemon_init(void); static void filemon_setfile(int mainfeed_fd, const char *mainfeed_path); static void filemon_callback(void); static void statemc_setstate(StateMachineState newsms, int periods, const char *forlog, const char *why); /*========== utility functions etc. ==========*/ static void perhaps_close(int *fd) { if (*fd) { close(*fd); fd=0; } } static pid_t xfork(const char *what) { pid_t child; child= fork(); if (child==-1) sysdie("cannot fork for %s",what); if (!child) postfork(what); 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",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", status); } } static int xwaitpid(pid_t *pid, const char *what) { int status; r= kill(*pid, SIGKILL); if (r) sysdie("cannot kill %s child", what); pid_t got= waitpid(*pid, &status, WNOHANG); if (got==-1) sysdie("cannot reap %s child", what); *pid= 0; return status; } static void xunlink(const char *path, const char *what) { int r= unlink(path); if (r) sysdie("can't unlink %s %s", path, what); } static void check_isreg(const struct stat *stab, const char *path, const char *what) { if (!S_ISREG(stab->st_mode)) die("%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= fstab(path, stab); if (r) sysdie("could not fstat %s %s", what, path); } static void xfstat_isreg(int fd, struct stat *stab_r, const char *what) { xfstat(fd, stab_r, what); check_isreg(stab, 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; } sysdie("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); } /*========== logging ==========*/ static void logcore(int sysloglevel, const char *fmt, ...) __attribute__((printf,2,3)) static void logcore(int sysloglevel, const char *fmt, ...) { va_list al; va_start(al,fmt); if (become_daemon) { vsyslog(sysloglevel,fmt,al); } else { vfprintf(stderr,fmt,al); putc('\n',stderr); } } static void logv(int sysloglevel, const char *pfx, int errnoval, int exitstatus, const char *fmt, va_list al) __attribute__((printf,4,0)) static void logv(int sysloglevel, const char *pfx, int errnoval, int exitstatus, const char *fmt, va_list al) { char msgbuf[256]; 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", sitename, pfx, msgbuf, errnoval>=0 ? ": " : "", errnoval>=0 ? strerror(errnoval) : ""); } #define logwrap(fn, pfx, sysloglevel, errno, estatus) \ static void fn(const char *fmt, ...) \ __attribute__((printf,1,2)); \ static void fn(const char *fmt, ...) { \ va_list al; \ va_start(al,fmt); \ logv(sysloglevel, pfx, errno, estatus, fmt, al); \ } logwrap(sysdie, " critical", LOG_CRIT, errno, 16); logwrap(die, " critical", LOG_CRIT, -1, 16); logwrap(sysfatal, " fatal", LOG_ERR, errno, 12); logwrap(fatal, " fatal", LOG_ERR, -1, 12); logwrap(syswarn, " warning", LOG_WARN, errno, 0); logwrap(warn, " warning", LOG_WARN, -1, 0); logwrap(notice, "", LOG_NOTICE, -1, 0); logwrap(info, " info", LOG_INFO, -1, 0); logwrap(debug, " debug", LOG_DEBUG, -1, 0); /*========== making new connections ==========*/ static int connecting_sockets[2]= {-1,-1}; static pid_t connecting_child; static void connect_attempt_discard(void) { if (connecting_sockets[0]) cancel_fd(connecting_sockets[0]); perhaps_close(&connecting_sockets[0]); perhaps_close(&connecting_sockets[1]); if (connecting_child) { int status= xwaitpid(&connecting_child, "connect"); if (!(WIFEXITED(status) || (WIFSIGNALED(status) && WTERMSIG(status) == SIGKILL))) report_child_status("connect", status); } } #define PREP_DECL_MSG_CMSG(msg) \ struct msghdr msg; \ memset(&msg,0,sizeof(msg)); \ char msg##cbuf[CMSG_SPACE(sizeof(fd))]; \ 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; conn= xmalloc(sizeof(*conn)); memset(conn,0,sizeof(*conn)); DECL_MSG_CMSG(msg); struct cmsghdr *h= 0; ssize_t rs= recvmsg(fd, &msg, MSG_DONTWAIT); if (rs >= 0) h= CMSG_FIRSTHDR(&msg); if (!h) { int status; pid_t got= waitpid(connecting_child, &status, WNOHANG); if (got != -1) { assert(got==connecting_child); connecting_child= 0; if (WIFEXITED(status) && (WEXITSTATUS(status) != 0 WEXITSTATUS(status) != CONNCHILD_ESTATUS_STREAM && WEXITSTATUS(status) != CONNCHILD_ESTATUS_NOSTREAM)) { /* child already reported the problem */ } else if (WIFSIGNALED(status) && WTERMSIG(status) == SIGALARM) { warn("connect: connection attempt timed out"); } else if (!WIFEXITED(status)) { report_child_status("connect", status); /* that's probably the root cause then */ } } else { /* child is still running apparently, report the socket problem */ if (rs < 0) syswarn("connect: read from child socket failed"); else if (e == OOP_EXCEPTIONN) warn("connect: unexpected exception on child socket"); else warn("connect: unexpected EOF on child socket"); } goto x; } #define CHK(field, val) \ if (h->cmsg_##field != val) { \ die("connect: child sent cmsg with cmsg_" #field "=%d, expected %d"); \ goto x; \ } CHK(level, SOL_SOCKET); CHK(type, SCM_RIGHTS); CHK(len, CMSG_LEN(sizeof(conn-b>fd))); #undef CHK if (CMSG_NXTHDR,&msg,h) { die("connect: child sent many cmsgs"); goto x; } memcpy(&conn->fd, CMSG_DATA(h), sizeof(conn->fd)); pid_t got= waitpid(connecting_child, &status, 0); if (got==-1) sysdie("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: fatal("connect: child gave unexpected exit status %d", es); } set nonblocking; /* Phew! */ LIST_ADDHEAD(idle, conn); notice(CN "connected %s", conn->fd, conn->stream ? "streaming" : "plain"); connect_attempt_discard(); check_master_queue(); return 0; x: if (conn) { perhaps_close(&conn->fd); free(conn); } connect_attempt_discard(); } static void connect_start() { assert(!connecting_sockets[0]); assert(!connecting_sockets[1]); assert(!connecting_child); notice("starting connection attempt"); r= socketpair(AF_UNIX, SOCK_STREAM, 0, connecting_sockets); if (r) { syswarn("connect: cannot create socketpair for child"); goto x; } connecting_child= xfork("connection"); if (!connecting_child) { FILE *cn_from, *cn_to; char buf[NNTP_STRLEN+100]; int exitstatus= CONNCHILD_ESTATUS_NOSTREAM; r= close(connecting_sockets[0]); if (r) sysdie("connect: close parent socket in child"); alarm(connection_setup_timeout); if (NNTPconnect(remote_host, port, &cn_from, &cn_to, buf) < 0) { if (buf[0]) { sanitise_inplace(buf); fatal("connect: rejected: %s", buf); } else { sysfatal("connect: connection attempt failed"); } } if (NNTPsendpassword(remote_host, cn_from, cn_to) < 0) sysfatal("connect: authentication failed"); if (try_stream) { if (fputs("MODE STREAM\r\n", cn_to) || fflush(cn_to)) sysfatal("connect: could not send MODE STREAM"); buf[sizeof(buf)-1]= 0; if (!fgets(buf, sizeof(buf)-1, cn_from)) { if (ferror(cn_from)) sysfatal("connect: could not read response to MODE STREAM"); else fatal("connect: connection close in response to MODE STREAM"); } int l= strlen(buf); assert(l>=1); if (buf[-1]!='\n') { sanitise_inplace(buf); fatal("connect: response to MODE STREAM is too long: %.100s...", remote_host, buf); } l--; if (l>0 && buf[1-]=='\r') l--; buf[l]= 0; char *ep; int rcode= strtoul(buf,&ep,10); if (ep != buf[3]) { sanitise_inplace(buf); fatal("connect: bad response to MODE STREAM: %.50s", buf); } switch (rcode) { case 203: exitstatus= CONNCHILD_ESTATUS_STREAM; break; case 480: case 500: break; default: sanitise_inplace(buf); warn("connect: unexpected response to MODE STREAM: %.50s", buf); 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(connecting_sockets[1], &msg, 0); if (r) sysdie("sendmsg failed for new connection"); _exit(exitstatus); } r= close(connecting_sockets[1]); connecting_sockets[1]= 0; if (r) sysdie("connect: close child socket in parent"); on_fd_read_except(connecting_sockets[0], connchild_event); return OOP_CONTINUE; x: connect_attempt_discard(); } /*========== overall control of article flow ==========*/ static void check_master_queue(void) { if (!queue.count) return; Conn *last_assigned=0; for (;;) { if (working.head) { conn_assign_one_article(&working, &last_assigned); } else if (idle.head) { conn_assign_one_article(&idle, &last_assigned); } else if (nconns < maxconns && queue.count >= max_queue_per_conn && !connecting_child && !connect_delay) { connect_delay= reconnect_delay_periods; connect_start(); } else { break; } } conn_check_work(last_assigned); } static void conn_assign_one_article(LIST(Conn) *connlist, Conn **last_assigned) { Conn *conn= connlist->head; LIST_REMOVE(*connlist, conn); Article *art= LIST_REMHEAD(queue); LIST_ADDTAIL(conn->queue, art); LIST_ADD(*conn_determine_right_list(conn), conn); /* This slightly odd arrangement is so that we call conn_check_work * once after filling the queue for a new connection in * check_master_queue, rather than for each article. */ if (conn != *last_assigned && *last_assigned) conn_check_work(*last_assigned); *last_assigned= conn; } static int conn_total_queued_articles(Conn *conn) { return conn->sent.count + conn->queue.count; } static LIST(Conn) *conn_determine_right_list(Conn *conn) { int inqueue= conn_total_queued_articles(conn); assert(inqueue <= max_queue); if (inqueue == 0) return &idle; if (inqueue == conn->max_queue) return &full; return &working; } static void *conn_writeable(oop_source *l, int fd, int ev, void *u) { check_conn_work(u); return OOP_CONTINUE; } static void conn_check_work(Conn *conn) { void *rp= 0; for (;;) { conn_make_some_xmits(conn); if (!conn->xmitu) { loop->cancel_fd(loop, conn->fd, OOP_WRITE); return; } void *rp= conn_write_some_xmits(conn); if (rp==OOP_CONTINUE) { loop->on_fd(loop, conn->fd, OOP_WRITE, conn_writeable, conn); return; } else if (rp==OOP_HALT) { return; } else if (!rp) { /* transmitted everything */ } else { abort(); } } } /*========== 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= 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, sk_Artdata); d->info.sm_art= ah; } static void xmit_free(XmitDetails *d) { switch (d->kind) { case xk_Malloc: free(d->info.malloc_tofree); break; 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 (errno == EAGAIN) return OOP_CONTINUE; connfail(conn, "write failed: %s", strerror(errno)); return OOP_HALT; } assert(rs > 0); for (done=0; rs && donexmit[done]; XmitDetails *dp= &conn->xmitd[done]; if (rs > vp->iov_len) { rs -= vp->iov_len; xmit_free(dp); } else { vp->iov_base += rs; vp->iov_len -= 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(queue); if (!art) break; if (art->checked || (conn->stream && nocheck)) { /* actually send it */ ARTHANDLE *artdata= SMretrieve(); if (conn->stream) { if (artdata) { XMIT_LITERAL("TAKETHIS "); xmit_noalloc(conn, art->mid, art->midlen); XMIT_LITERAL("\r\n"); xmit_artbody(conn, artdata); } } else { /* we got 235 from IHAVE */ if (artdata) { xmit_artbody(conn, artdata); } else { XMIT_LITERAL(".\r\n"); } } art->sent= 1; LIST_ADDTAIL(conn->sent, art); art->ipf->counts[art->checked].sent++; } else { /* check it */ if (conn->stream) XMIT_LITERAL("IHAVE "); else XMIT_LITERAL("CHECK "); xmit_noalloc(art->mid, art->midlen); XMIT_LITERAL("\r\n"); LIST_ADDTAIL(conn->sent, art); art->ipf->counts[art->checked].offered++; } } } /*========== 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_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(Connection *conn, const char *response, int code_indicates_streaming, const char *sanitised_response) { Article *art= LIST_REMHEAD(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("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("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("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("peer gave non-streaming response code to CHECK/TAKETHIS: %s", sanitised_response); return 0; } } return art; } static void update_nocheck(int accepted) { accept_proportion *= accept_decay; accept_proportion += accepted; 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 != nockech) { debug("nocheck mode %s", new_nocheck ? "start" : "stop"); } nocheck= new_nocheck; } static void article_done(Connection *conn, Article *art, int whichcount) { art->ipf->counts.articles[art->checked][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 w= art->blanklen; if (w >= sizeof(spaces)) w= sizeof(spaces)-1; int r= pwrite(ipf->fd, spaces, w, art->offset); if (r==-1) { if (errno==EINTR) continue; sysdie("failed to blank entry for %s (length %d at offset %lu) in %s", art->messageid, art->blanklen, art->offset, ipf->path); } assert(r>=0 && r<=w); art->blanklen -= w; art->offset += w; } ipf->inprogress--; assert(ipf->inprogress >= 0); if (!ipf->inprogress && ipf != main_input_file) queue_check_input_done(); free(art); } static void *peer_rd_ok(oop_source *lp, oop_read *oread, oop_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 *ep; unsigned long code= strtoul(data, &ep, 10); if (ep != data+3 || *ep != ' ' || data[0]=='0') { char sanibuf[100]; const char *p= data; char *q= sanibuf; *q++= '`'; for (;;) { if (q > sanibuf+sizeof(sanibuf)-8) { strcpy(q,"..."); break; } int c= *p++; if (!c) { *q++= '\''; break; } if (c>=' ' && c<=126 && c!='\\') { *q++= c; continue; } sprintf(q,"\\x%02x",c); q += 4; } connfail(conn, "badly formatted response from peer: %s", sanibuf); return OOP_CONTINUE; } if (conn->quitting) { if (code!=205) { connfail(conn, "peer gave failure response to QUIT: %s", sani); return OOP_CONTINUE; } conn close ok; return; } Article *art; #define GET_ARTICLE \ art= article_reply_check(conn, data, code_streaming, sani); \ if (art) ; else return OOP_CONTINUE /* reply_check has failed the conn */ #define ARTICLE_DEALTWITH(streaming,how) \ code_streaming= (streaming) \ GET_ARTICLE; \ article_done(conn, art, RC_##how); break; #define PEERBADMSG(m) connfail(conn, m ": %s", sani); return OOP_CONTINUE int code_streaming= 0; switch (code) { case 400: PEERBADMSG("peer stopped accepting articles"); case 503: PEERBADMSG("peer timed us out"); default: PEERBADMSG("peer sent unexpected message"); case 435: ARTICLE_DEALTWITH(0,unwanted); /* IHAVE says they have it */ case 438: ARTICLE_DEALTWITH(1,unwanted); /* CHECK/TAKETHIS: they have it */ case 235: ARTICLE_DEALTWITH(0,accepted); /* IHAVE says thanks */ case 239: ARTICLE_DEALTWITH(1,accepted); /* TAKETHIS says thanks */ case 437: ARTICLE_DEALTWITH(0,rejected); /* IHAVE says rejected */ case 439: ARTICLE_DEALTWITH(1,rejected); /* TAKETHIS says rejected */ case 238: /* CHECK says send it */ code_streaming= 1; case 335: /* IHAVE says send it */ GET_ARTICLE; count_checkedwanted++; LIST_ADDTAIL(conn->queue); if (art->checked) { connfail("peer gave %d response to article body: %s",code, sani); return OOP_CONTINUE; } art->checked= 1; break; case 431: /* CHECK or TAKETHIS says try later */ code_streaming= 1; case 436: /* IHAVE says try later */ GET_ARTICLE; open_defer(); if (fprintf(defer, "%s %s\n", TokenToText(art->token), art->messageid) <0 || fflush(defer)) sysfatal("write to defer file %s",path_defer); article_done(conn, art, RC_deferred); break; } check_check_work(conn); return OOP_CONTINUE; } /*========== monitoring of input files ==========*/ static void feedfile_eof(InputFile *ipf) { assert(ipf != main_input_file); /* promised by tailing_try_read */ inputfile_tailing_stop(ipf); assert(ipf->fd >= 0); if (close(ipf->fd)) sysdie("could not close input file %s", ipf->path); ipf->fd= -1; if (ipf == flushing_input_file) { assert(sms==sm_SEPARATED || sms==sm_DROPPING); if (main_input_file) inputfile_tailing_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_RDONLY); if (fd<0) { if (errno==ENOENT) return 0; sysfatal("unable to open input file %s", path); } InputFile *ipf= xmalloc(sizeof(*ipf) + strlen(path) + 1); memset(ipf,0,sizeof(*ipf)); ipf->readable.on_readable= tailing_on_readable; ipf->readable.on_cancel= tailing_on_cancel; ipf->readable.try_read= tailing_try_read; ipf->fd= fd; strcpy(ipf->path, path); return ipf; } static void close_input_file(InputFile *ipf) { assert(!ipf->readable_callback); /* must have had ->on_cancel */ assert(!ipf->filemon); /* must have had inputfile_tailing_stop */ assert(!ipf->rd); /* must have had inputfile_tailing_stop */ assert(!ipf->inprogress); /* no dangling pointers pointing here */ if (ipf->fd >= 0) if (close(ipf->fd)) sysdie("could not close input file %s", ipf->path); } /*---------- dealing with articles read in the input file ----------*/ typedef 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; } if (data[0] && data[0]!=' ') { char *space= strchr(data,' '); int tokenlen= space-data; int midlen= (int)recsz-tokenlen-1; if (midlen < 0) goto bad_data; if (tokenlen != sizeof(TOKEN)*2+2) goto bad_data; memcpy(tokentextbuf, data, tokenlen); tokentextbuf[tokenlen]= 0; if (!IsToken(tokentextbuf)) goto bad_data; art= xmalloc(sizeof(*art) - 1 + midlen + 1); art->offset= ipf->offset; art->blanklen= recsz; art->midlen= midlen; art->checked= 0; art->ipf= ipf; ipf->inprogress++; art->token= TextToToken(tokentextbuf); strcpy(art->messageid, space+1); LIST_ADDTAIL(queue, art); } ipf->offset += recsz + 1; if (sms==sm_NORMAL && ipf==main_input_file && ipf->offset >= flush_threshold) statemc_start_flush("feed file size"); check_master_queue(); } static void statemc_start_flush(const char *why) { /* Normal => Flushing */ assert(sms == sm_NORMAL); debug("starting flush (%s) (%lu >= %lu) (%d)", why, (unsigned long)ipf->offset, (unsigned long)flush_threshold, sm_period_counter); int r= link(feedfile, duct_path); if (r) sysdie("link feedfile %s to flushing file %s", feedfile, path_duct); /* => Hardlinked */ xunlink(feedfile, "old feedfile link"); /* => Moved */ spawn_inndcomm_flush(why); /* => Flushing FLUSHING */ } /*========== tailing input file ==========*/ static void filemon_start(InputFile *ipf) { assert(!ipf->filemon); ipf->filemon= xmalloc(sizeof(*ipf->filemon)); memset(ipf->filemon, 0, sizeof(*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; } static void filemon_callback(InputFile *ipf) { ipf->readable_callback(ipf->readable_callback_user); } static void *tailing_rable_call_time(oop_source *loop, struct timeval tv, void *user) { InputFile *ipf= user; return ipf->readable_callback(ipf->readable_callback_user); } static void on_cancel(struct oop_readable *rable) { InputFile *ipf= (void*)rable; if (ipf->filemon) filemon_stopfile(ipf); loop->cancel_time(loop, OOP_TIME_NOW, tailing_rable_call_time, ipf); ipf->readable_callback= 0; } static void tailing_queue_readable(InputFile *ipf) { /* lifetime of ipf here is OK because destruction will cause * on_cancel which will cancel this callback */ 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; tailing_on_cancel(rable); ipf->readable_callback= cb; ipf->readable_callback_user= user; filemon_startfile(ipf); tailing_queue_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; return r; } if (!r) { if (ipf==main_input_file) { errno=EAGAIN; return -1; } else if (ipf==flushing_input_file) { assert(ipf->fd>=0); assert(sms==sm_SEPARATED || sms==sm_DROPPING); } else if (ipf==backlog_input_file) { assert(ipf->fd>=0); } else { abort(); } } return r; } } /*---------- filemon implemented with inotify ----------*/ #if defined(HAVE_INOTIFY) && !defined(HAVE_FILEMON) #define HAVE_FILEMON #include static int filemon_inotify_fd; static int filemon_inotify_wdmax; static InputFile **filemon_inotify_wd2ipf; typedef struct Filemon_Perfile { int wd; } Filemon_Inotify_Perfile; 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_wd= 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; debug("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; debug("filemon inotify stopfile %p wd=%d", ipf, wd); int r= inotify_rm_watch(filemon_inotify_fd, filemon_inotify_wd); if (r) sysdie("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 (errno==EAGAIN) break; sysdie("read from inotify master"); } else if (r==sizeof(iev)) { assert(iev.wd >= 0 && iev.wd < filemon_inotify_wdmax); } else { die("inotify read %d bytes wanted struct of %d", r, (int)sizeof(iev)); } InputFile *ipf= filemon_inotify_wd2ipf[iev.wd]; debug("filemon inotify readable read %p wd=%p", iev.wd, ipf); filemon_callback(ipf); } return OOP_CONTINUE; } static int filemon_method_init(void) { filemon_inotify_fd= inotify_init(); if (filemon_inotify_fd<0) { syswarn("could not initialise inotify: inotify_init failed"); return 0; } set nonblock; loop->on_fd(loop, filemon_inotify_fd, OOP_READ, filemon_inotify_readable); debug("filemon inotify init filemon_inotify_fd=%d", filemon_inotify_fd); return 1; } #endif /* HAVE_INOTIFY && !HAVE_FILEMON *// /*---------- filemon dummy implementation ----------*/ #if !defined(HAVE_FILEMON) typedef struct Filemon_Perfile { int dummy; } Filemon_Dummy_Perfile; static int filemon_method_init(void) { return 0; } static void filemon_method_startfile(InputFile *ipf, Filemon_Perfile *pf) { } static void filemon_method_stopfile(InputFile *ipf, Filemon_Perfile *pf) { } #endif /* !HAVE_FILEMON */ /*---------- interface to start and stop an input file ----------*/ static const oop_rd_style feedfile_rdstyle= { OOP_RD_DELIM_STRIP, '\n', OOP_RD_NUL_FORBID, OOP_RD_SHORTREC_EOF, }; static void inputfile_tailing_start(InputFile *ipf) { assert(!ipf->fd); 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->fd); int r= oop_rd_read(ipf->rd, &feedfile_rdstyle, MAX_LINE_FEEDFILE, feedfile_got_article,ipf, feedfile_problem,ipf); if (r) sysdie("unable start reading feedfile %s",ipf->path); } static void inputfile_tailing_stop(InputFile *ipf) { assert(ipf->fd); oop_rd_cancel(ipf->rd); 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->fd>=0 | | flsh->fd>=0 | [Separated] | | [Dropping] | main F idle | | main none | old D tail | | old D tail | ============= | | ============ | | | | install | ^ | EOF ON D | | defer | EOF ON D | V | | V | =============== | | =============== | SEPARATED-2 | | DROPPING-2 | flsh->fd==-1 | V flsh->fd==-1 | [Finishing] | | [Dropping] | main F tail | `. main none | old D closed | `. old 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 old none some backlog ============== | | ALL BACKLOG DONE | | unlink lock | exit V ========== (ESRCH) [Droppped] ========== * ->8- */ static void statemc_init(void) { struct stat stab, stabf; path_lock= xasprintf("%s_lock", feedfile); path_flushing= xasprintf("%s_flushing", feedfile); path_defer= xasprintf("%s_defer", feedfile); globpat_backlog= xasprintf("%s_backlog*", feedfile); for (;;) { int lockfd= open(path_lock, O_CREAT|O_RDWR, 0600); if (lockfd<0) sysfatal("open lockfile %s", path_lock); struct flock fl; memset(&fl,0,sizeof(fl)); fl.l_type= F_WRLCK; fl.l_whence= SEEK_SET; r= fcntl(lockfd, F_SETLK, &fl); if (r==-1) { if (errno==EACCES || errno==EAGAIN) { if (quiet_if_locked) exit(0); fatal("another duct holds the lockfile"); } sysdie("fcntl F_SETLK lockfile %s", path_lock); } xfstat_isreg(lockfd, &stabf, "lockfile"); int lock_noent; xlstat_isreg(path_lock, &stab, &lock_noent, "lockfile"); if (!lock_noent && samefile(&stab, &stabf)) break; if (close(lockfd)) sysdie("could not close stale lockfile %s", path_lock); } debug("startup: locked"); search_backlog_file(); int defer_noent; xlstat_isreg(path_defer, &stab, &defer_noent, "defer file"); if (defer_noent) { debug("startup: ductdefer ENOENT"); } else { debug("startup: ductdefer nlink=%ld", (long)stab.st_nlink); switch (stab.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: die("defer file %s has unexpected link count %d", path_defer, stab.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, "flushing file"); xlstat_isreg(feedfile, &stab_f, &noent_f, "feedfile"); if (!noent_f && file_d && samefile(&stab_f, &stab_d)) { debug("startup: F==D => Hardlinked"); xunlink(feedfile, "feed file (during startup)"); /* => Moved */ noent_f= 1; } if (noent_f) { debug("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) { debug("startup: F!=D => Separated"); startup_set_input_file(file_d); SMS(SEPARATED, 0, "found both old and current feed files"); } else { debug("startup: F exists, D ENOENT => Normal"); FILE *file_f= open_input_file(feedfile); if (!file_f) die("feed file vanished during startup"); startup_set_input_file(file_f); SMS(NORMAL, flushfail_retry_periods, "normal startup"); } } } static void statemc_period_poll(void) { if (!sm_period_counter) return; sm_period_counter--; assert(sm_period_counter>=0); if (sm_period_counter) return; switch (sms) { case sm_NORMAL: statemc_start_flush("periodic"); /* Normal => Flushing; => FLUSHING */ break; case sm_FLUSHFAILED: spawn_inndcomm_flush("retry"); /* Moved => Flushing; => FLUSHING */ break; default: abort(); } } static void startup_set_input_file(InputFile *f) { assert(!main_input_file); main_input_file= f; inputfile_tailing_start(f); } static int inputfile_is_done(InputFile *ipf) { if (!ipf) return 0; if (ipf->inprogress) return 0; /* new article in the meantime */ if (ipf->fd >= 0); return 0; /* not had EOF */ return 1; } static void notice_processed(InputFile *ipf, const char *what, const char *spec) { info("processed %s%s checked=%d unchecked=%d sent=%d"); wip; } 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,"backlog:",rest); close_input_file(ipf); if (unlink(ipf->path)) { if (errno != ENOENT) sysdie("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,"feedfile",0); 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, 0, "flush complete"); } else if (sms==sm_DROPPING) { SMS(DROPPED, 0, "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) { assert(!inputfile_is_done(main_input_file)); 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; sm_period_counter= periods; const char *xtra= ""; switch (sms) { case sm_FLUSHING: sm_FLUSHFAILED: if (!main_input_file) xtra= "-ABSENT"; break; case sm_SEPARATED: case sm_DROPPING: xtra= flushing_input_file->fd >= 0 ? "-1" : "-2"; break; default:; } if (periods) { info("%s%s[%d] %s",forlog,xtra,periods,why); } else { info("%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) sysfatal("could not open defer file %s", path_defer); /* truncate away any half-written records */ xfstat_isreg(fileno(defer), &stab, "newly opened defer file"); if (stab.st_size > LONG_MAX) die("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) sysdie("seek in defer file %s while truncating partial", path_defer); r= getc(defer); if (r==EOF) { if (ferror(defer)) sysdie("failed read from defer file %s", path_defer); else die("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)) sysfatal("could not flush defer file %s", path_defer); if (ftruncate(fileno(defer), truncto)) sysdie("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)) sysdie("could not seek to new end of defer file %s", path_defer); } static void close_defer(void) { if (!defer) return; xfstat(fileno(defer), &stab, "defer file"); if (fclose(defer)) sysfatal("could not close defer file %s", path_defer); defer= 0; char *backlog= xasprintf("%s_backlog_%lu.%lu", feedfile, (unsigned long)now.tv_sec, (unsigned long)stab.st_ino); if (link(path_defer, path_backlog)) sysfatal("could not install defer file %s as backlog file %s", path_defer, backlog); if (unlink(path_defer)) sysdie("could not unlink old defer link %s to backlog file %s", path_defer, 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; struct stat stab; const char *oldest_path=0; time_t oldest_mtime, now; if (backlog_input_file) return 3; 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 (i=0; i= 0 && until_backlog_nextscan > backlog_spontaneous_rescan_periods) until_backlog_nextscan= backlog_spontaneous_rescan_periods; debug("backlog scan: young age=%f deficiency=%ld nextscan=%d oldest=%s", age, age_deficiency, until_backlog_nextscan, oldest_path); return 2; } /*========== flushing the feed ==========*/ static pid_t inndcomm_child; static void *inndcomm_event(oop_source *lp, int fd, oop_event e, void *u) { assert(inndcomm_child); int status= xwaitpid(&inndcomm_child, "inndcomm"); loop->cancel_fd(fd); close(fd); assert(!flushing_input_file); if (WIFEXITED(status)) { switch (WEXITSTATUS(status)) { case INNDCOMMCHILD_ESTATUS_FAIL: goto failed; case INNDCOMMCHILD_ESTATUS_NONESUCH: warn("feed has been dropped by innd, finishing up"); flushing_input_file= main_input_file; tailing_queue_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, 0, "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_queue_readable(flushing_input_file); main_input_file= open_input_file(feedfile); if (!main_input_file) die("flush succeeded but feedfile %s does not exist!", feedfile); if (flushing_input_file) { SMS(SEPARATED, spontaneous_flush_periods, "recovery flush complete"); } else { close_defer(); SMS(NORMAL, spontaneous_flush_periods, "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"); } 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); if (pipe(pipefds)) sysdie("create pipe for inndcomm child sentinel"); inndcomm_child= xfork(); if (!inndcomm_child) { static char flushargv[2]= { sitename, 0 }; char *reply; close(pipefds[0]); 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); } close(pipefds[1]); int sentinel_fd= pipefds[0]; on_fd_read_except(sentinel_fd, inndcomm_event); SMS(FLUSHING, 0, why); } /*========== main program ==========*/ static void postfork_inputfile(InputFile *ipf) { if (!ipf) return; assert(ipf->fd >= 0); close(ipf->fd); ipf->fd= -1; } static void postfork_conns(Connection *conn) { while (conn) { close(conn->fd); conn= conn->next; } } static void postfork_stdio(FILE *f) { /* we have no stdio streams that are buffered long-term */ if (f) fclose(f); } static void postfork(const char *what) { if (signal(SIGPIPE, SIG_DFL) == SIG_ERR) sysdie("%s child: failed to reset SIGPIPE"); postfork_inputfile(main_input_file); postfork_inputfile(flushing_input_file); postfork_conns(idle.head); postfork_conns(working.head); postfork_conns(full.head); postfork_stdio(defer); } #define EVERY(what, interval, body) \ static const struct timeval what##_timeout = { 5, 0 }; \ static void what##_schedule(void); \ static void *what##_timedout(oop_source *lp, struct timeval tv, void *u) { \ { body } \ what##_schedule(); \ } \ static void what##_schedule(void) { \ loop->on_time(loop, what##_timeout, what##_timedout, 0); \ } EVERY(filepoll, {5,0}, { if (main_input_file && main_input_file->readable_callback) filemon_callback(main_input_file); }); #define DEBUGF_IPF(wh) " " #wh "=%p/%s:ip=%ld,off=%ld,fd=%d%s" \ #define DEBUG_IPF(sh) \ wh##_input_file, debug_ipf_path(wh##_input_file), \ wh##_input_file->inprogress, (long)wh##_input_file->offset, \ wh##_input_file->fd, wh##_input_file->rd ? "+" : "" static const char *debug_ipf_path(InputFile *ipf) { char *slash= strrchr(ipf->path,'/'); return slash ? slash+1 : ipf->path; } EVERY(period, {PERIOD_SECONDS,0}, { debug("PERIOD" " sms=%s[%d] queue=%d connect_delay=%d" " input_files" DEBUGF_IPF(main) DEBUGF_IPF(old) DEBUGF_FMT(flushing) " conns idle=%d working=%d full=%d" " children connecting=%ld inndcomm_child" , sms_names[sms], sm_period_counter, queue.count, connect_delay, DEBUG_IPF(main), DEBUG_IPF(flushing), DEBUG_IPF(flushing), idle.count, working.count, full.count, (long)connecting_child, (long)inndcomm_child ); if (connect_delay) connect_delay--; poll_backlog_file(); if (!backlog_input_file) close_defer(); /* want to start on a new backlog */ statemc_period_poll(); check_master_queue(); }); /*========== option parsing ==========*/ enum OptFlags { of_seconds= 001000u; of_boolean= 002000u; }; typedef struct Option Option; typedef void OptionParser(const Option*, const char *val); struct Option { int short; const char *long; void *store; OptionParser *fn; int noarg; }; void op_integer(const Option *o, const char *val) { char *ep; errno= 0; unsigned long ul= strtoul(val,&ep,10); if (*ep || ep==val || errno || ul>INT_MAX) badusage("bad integer value for %s",o->long); int *store= o->store; *store= ul; } void op_double(const Option *o, const char *val) { int *store= o->store; char *ep; errno= 0; *store= strtod(val, &ep); if (*ep || ep==val || errno) badusage("bad floating point value for %s",o->long); } void op_string(const Option *o, const char *val) { char **store= o->store; free(*store); *store= val; } void op_seconds(const Option *o, const char *val) { int *store= o->store; char *ep; double v= strtod(val,&ep); if (ep==val) badusage("bad time/duration value for %s",o->long); if (!*ep || !strcmp(ep,"s")) unit= 1; else if (!strcmp(ep,"m")) unit= 60; else if (!strcmp(ep,"h")) unit= 3600; else if (!strcmp(ep,"d")) unit= 86400; else badusage("bad units %s for time/duration value for %s",ep,o->long); v *= unit; v= ceil(v); if (v > INT_MAX) badusage("time/duration value for %s out of range",o->long); *store= v; } void op_periods_rndup(const Option *o, const char *val) { int *store= o->store; op_seconds(o,val); *store += PERIOD_SECONDS-1; *store /= PERIOD_SECONDS; } void op_periods_booltrue(const Option *o, const char *val) { int *store= o->store; *store= 1; } void op_periods_boolfalse(const Option *o, const char *val) { int *store= o->store; *store= 0; } static const Option options[]= { { 0, "max-connections", &max_connections op_integer }, { 0, "streaming", &try_stream, op_booltrue, 1 }, { 0, "no-streaming", &try_stream, op_boolfalse, 1 }, {'h',"host", &remote_host, op_string }, {'P',"port", &port op_integer }, { 0, "inndconf", &inndconffile, op_string }, {'f',"feedfile", &feedfile, op_string }, {'q',"quiet-multiple", &quiet_if_locked, op_booltrue, 1 }, { 0, "no-quiet-multiple", &quiet_if_locked, op_boolfalse, 1 }, {'d',"daemon", &become_daemon, op_booltrue, 1 }, { 0, "no-daemon", &become_daemon, op_boolfalse, 1 }, { 0, "no-check-proportion", &nocheck_thresh_pct, op_double }, { 0, "no-check-filter", &nocheck_decay_articles, op_double }, { 0, "max-queue-size", &max_queue_per_conn op_integer }, { 0, "reconnect-interval", &reconnect_delay_periods, op_periods_rndup }, { 0, "flush-retry-interval", &flushfail_retry_periods, op_periods_rndup }, { 0, "connection-timeout", &connection_timeout, op_seconds }, { 0, "inndcomm-timeout", &inndcomm_flush_timeout, op_seconds }, }; int main(int argc, char **argv) { const char *arg; for (;;) { arg= *++argv; if (!arg) break; if (*arg != '-') break; if (!strcmp(arg,"--")) { arg= *++argv; break; } int a; while ((a= *++arg)) { const Option *o; if (a=='-') { arg++; char *equals= strchr(arg,'='); int len= equals ? (equals - arg) : strlen(arg); for (o=options; o->long; o++) if (strlen(o->long) == len && !memcmp(o->long,arg,len)) goto found_long; badusage("unknown long option --%s",arg); found_long: if (o->noarg) { if (equals) badusage("option --%s does not take a value",o->long); arg= 0; } else if (equals) { arg= equals+1; } else { arg= *++argv; if (!arg) badusage("option --%s needs a value",o->long); } o->fn(o, arg); break; /* eaten the whole argument now */ } for (o=options; o->long; o++) if (a == o->short) goto found_short; badusage("unknown short option -%c",a); found_short: if (o->noarg) { o->fn(o,0); } else { if (!*++arg) { arg= *++argv; if (!arg) badusage("option -%c needs a value",o->short); } o->fn(o,arg); break; /* eaten the whole argument now */ } } } if (!arg) badusage("need site name argument"); sitename= arg; if ((arg= *++argv)) { if (remote_host) badusage("must not specify -h and also host as argument"); remote_host= arg; } if (*++argv) badusage("too many non-option arguments"); if (nocheck_thresh_pct < 0 || nocheck_thresh_pct > 100) badusage("nocheck threshold percentage must be between 0..100"); nocheck_thresh= nocheck_thresh_pct * 0.01; if (nocheck_decay_articles < 0.1) badusage("nocheck decay articles must be at least 0.1"); nocheck_decay= 1 - 1/nocheck_decay_articles; innconf_read(inndconffile); if (!feedfile) feedfile= xasprintf("%s/%s",pathoutgoing,sitename); else if (!feedfile[0]) badusage("feed filename must be nonempty"); else if (feedfile[strlen(feedfile)-1]=='/') feedfile= xasprintf("%s%s",feedfile,sitename); const char *feedfile_forbidden= "?*[~#"; int c; while ((c= *feedfile_forbidden++)) if (strchr(feedfile, c)) badusage("feed filename may not contain metacharacter %c",c); if (signal(SIGPIPE, SIG_IGN) == SIG_ERR) sysdie("could not ignore SIGPIPE"); if (become_daemon) { for (i=3; i<255; i++) /* do this now before we open syslog, etc. */ close(i); openlog("innduct",LOG_NDELAY|LOG_PID,LOG_NEWS); int null= open("/dev/null",O_RDWR); if (null<0) sysdie("failed to open /dev/null"); dup2(null,0); dup2(null,1); dup2(null,2); close(null); pid_t child1= xfork("daemonise first fork"); if (child1) _exit(0); pid_t sid= setsid(); if (sid != child1) sysdie("setsid failed"); pid_t child2= xfork("daemonise second fork"); if (child2) _exit(0); } notice("starting"); if (!filemon_init()) { warn("no file monitoring available, polling"); filepoll_schedule(); } period_schedule(); statemc_init(); loop->execute. }