+static void *control_rd_ok(oop_source *lp, oop_read *oread, oop_rd_event ev,
+ const char *errmsg, int errnoval,
+ const char *data, size_t recsz, void *cc_v) {
+ ControlConn *cc= cc_v;
+
+ if (!data) {
+ info("CTRL%d closed", cc->fd);
+ cc->destroy(cc);
+ return OOP_CONTINUE;
+ }
+
+ if (recsz == 0) goto prompt;
+
+ const ControlCommand *ccmd;
+ for (ccmd=control_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:
+ control_prompt(cc);
+ return OOP_CONTINUE;
+}
+
+static void *control_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) {
+ ControlConn *cc= cc_v;
+
+ info("CTRL%d read error %s", cc->fd, errmsg);
+ cc->destroy(cc);
+ return OOP_CONTINUE;
+}
+
+static int control_conn_startup(ControlConn *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 control failed"); return -1; }
+
+ int er= oop_rd_read(cc->rd, &control_rd_style, MAX_CONTROL_COMMAND,
+ control_rd_ok, cc,
+ control_rd_err, cc);
+ if (er) { errno= er; syswarn("oop_rd_read control failed"); return -1; }
+
+ info("CTRL%d %s ready", cc->fd, how);
+ control_prompt(cc);
+ return 0;
+}
+
+static void control_stdio_destroy(ControlConn *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 control_stdio(void) {
+ NEW_DECL(ControlConn *,cc);
+ cc->destroy= control_stdio_destroy;
+
+ cc->fd= 0;
+ cc->out= stdout;
+ int r= control_conn_startup(cc,"stdio");
+ if (r) cc->destroy(cc);
+}
+
+static void control_accepted_destroy(ControlConn *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 *control_master_readable(oop_source *lp, int master,
+ oop_event ev, void *u) {
+ NEW_DECL(ControlConn *,cc);
+ cc->destroy= control_accepted_destroy;
+
+ cc->salen= sizeof(cc->sa);
+ cc->fd= accept(master, &cc->sa.sa, &cc->salen);
+ if (cc->fd<0) { syswarn("error accepting control connection"); goto x; }
+
+ cc->out= fdopen(cc->fd, "w");
+ if (!cc->out) { syswarn("error fdopening accepted control conn"); goto x; }
+
+ int r= control_conn_startup(cc, "accepted");
+ if (r) goto x;
+
+ return OOP_CONTINUE;
+
+ x:
+ cc->destroy(cc);
+ return OOP_CONTINUE;
+}
+
+#define NOCONTROL(...) do{ \
+ syswarn("no control socket, because failed to " __VA_ARGS__); \
+ goto nocontrol; \
+ }while(0)
+
+static void control_init(void) {
+ char *real=0;
+
+ union {
+ struct sockaddr sa;
+ struct sockaddr_un un;
+ } sa;
+
+ memset(&sa,0,sizeof(sa));
+ int maxlen= sizeof(sa.un.sun_path);
+
+ int reallen= readlink(path_control, sa.un.sun_path, maxlen);
+ if (reallen<0) {
+ if (errno != ENOENT)
+ NOCONTROL("readlink control socket symlink path %s", path_control);
+ }
+ if (reallen >= maxlen) {
+ debug("control socket symlink path too long (r=%d)",reallen);
+ xunlink(path_control, "old (overlong) control socket symlink");
+ reallen= -1;
+ }
+
+ if (reallen<0) {
+ struct stat stab;
+ int r= lstat(realsockdir,&stab);
+ if (r) {
+ if (errno != ENOENT) NOCONTROL("lstat real socket dir %s", realsockdir);
+
+ r= mkdir(realsockdir, 0700);
+ if (r) NOCONTROL("mkdir real socket dir %s", realsockdir);
+
+ } else {
+ uid_t self= geteuid();
+ if (!S_ISDIR(stab.st_mode) ||
+ stab.st_uid != self ||
+ stab.st_mode & 0007) {
+ warn("no control socket, because real socket directory"
+ " is somehow wrong (ISDIR=%d, uid=%lu (exp.%lu), mode %lo)",
+ !!S_ISDIR(stab.st_mode),
+ (unsigned long)stab.st_uid, (unsigned long)self,
+ (unsigned long)stab.st_mode & 0777UL);
+ goto nocontrol;
+ }
+ }
+
+ real= xasprintf("%s/s%lx.%lx", realsockdir,
+ (unsigned long)xtime(), (unsigned long)self_pid);
+ int reallen= strlen(real);
+
+ if (reallen >= maxlen) {
+ warn("no control socket, because tmpnam gave overly-long path"
+ " %s", real);
+ goto nocontrol;
+ }
+ r= symlink(real, path_control);
+ if (r) NOCONTROL("make control socket path %s a symlink to real"
+ " socket path %s", path_control, real);
+ memcpy(sa.un.sun_path, real, reallen);
+ }
+
+ int r= unlink(sa.un.sun_path);
+ if (r && errno!=ENOENT)
+ NOCONTROL("remove old real socket %s", sa.un.sun_path);
+
+ control_master= socket(PF_UNIX, SOCK_STREAM, 0);
+ if (control_master<0) NOCONTROL("create new control socket");
+
+ sa.un.sun_family= AF_UNIX;
+ int sl= strlen(sa.un.sun_path) + offsetof(struct sockaddr_un, sun_path);
+ r= bind(control_master, &sa.sa, sl);
+ if (r) NOCONTROL("bind to real socket path %s", sa.un.sun_path);
+
+ r= listen(control_master, 5);
+ if (r) NOCONTROL("listen");
+
+ xsetnonblock(control_master, 1);
+
+ loop->on_fd(loop, control_master, OOP_READ, control_master_readable, 0);
+ info("control socket ok, real path %s", sa.un.sun_path);
+
+ return;
+
+ nocontrol:
+ free(real);
+ xclose_perhaps(&control_master, "control master",0);
+ return;
+}
+
+/*========== management of connections ==========*/
+
+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 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);
+ until_connect= reconnect_delay_periods;
+}
+
+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);
+ }
+
+ int i;
+ XmitDetails *d;
+ for (i=0, d=conn->xmitd; i<conn->xmitu; i++, d++)
+ xmit_free(d);
+
+ char *m= xvasprintf(fmt,al);
+ warn("C%d connection failed (requeueing " RCI_TRIPLE_FMT_BASE "): %s",
+ conn->fd, RCI_TRIPLE_VALS_BASE(requeue, /*nothing*/), m);
+ free(m);
+
+ LIST_REMOVE(conns,conn);
+ 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 check_idle_conns(void) {
+ Conn *conn;
+ 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");
+ 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 {
+ 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= 1;
+ conn->since_activity= 0;
+ debug("C%d is idle, quitting", conn->fd);
+ break;
+ }
+ }
+ }
+ goto search_again;
+ }
+}
+
+/*---------- 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) { \
+ die("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)) die("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) 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);
+ }
+
+ /* 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) die("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) sysdie("oop_rd_read for peer (fd=%d)",conn->fd);
+
+ notice("C%d connected %s", conn->fd, conn->stream ? "streaming" : "plain");
+ LIST_ADDHEAD(conns, conn);
+
+ connect_attempt_discard();
+ check_assign_articles();
+ return OOP_CONTINUE;
+
+ x:
+ conn_dispose(conn);
+ connect_attempt_discard();
+ 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 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]) {
+ sysfatal("connect: connection attempt failed");
+ } else {
+ buf[l]= 0;
+ fatal("connect: %s: %s", stripped ? "rejected" : "failed",
+ sanitise(buf,-1));
+ }
+ }
+ if (NNTPsendpassword((char*)remote_host, cn_from, cn_to) < 0)
+ sysfatal("connect: authentication failed");
+ if (try_stream) {
+ if (fputs("MODE STREAM\r\n", cn_to)==EOF ||
+ 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[l-1]!='\n')
+ fatal("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])
+ fatal("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) sysdie("sendmsg failed for new connection");
+ if (r!=1) die("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);
+}
+
+/*---------- 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);
+ else return LIST_REMHEAD(ipf->queue);
+}
+
+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);
+ spare--;
+ }
+ conn_maybe_write(use);
+ } else if (allow_connect_start()) {
+ until_connect= reconnect_delay_periods;
+ 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);
+ 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();
+ }
+ }
+}
+
+/*---------- expiry and deferral ----------*/
+
+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))
+ sysfatal("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->counts[art_Unchecked][RC_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 exp= article_check_expired(art);
+ if (!exp) break;
+ }
+}
+
+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(InputFile *ipf) {
+ ipf->autodefer= 0;
+
+ Article *art;
+ while ((art= LIST_REMHEAD(ipf->queue)))
+ article_autodefer(ipf, art);
+
+ 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= -1;
+ }
+ while (ipf->inprogress) {
+ FOR_CONN(walk)
+ if (walk->quitting < 0) goto found;
+ abort(); /* where are they ?? */
+
+ found:
+ connfail(walk, "connection is stuck or crawling,"
+ " and we need to finish flush");
+ }
+ }
+}
+
+/*========== 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 && done<conn->xmitu; done++) {
+ struct iovec *vp= &conn->xmit[done];
+ XmitDetails *dp= &conn->xmitd[done];
+ if (rs > vp->iov_len) {
+ rs -= vp->iov_len;
+ xmit_free(dp);
+ } else {
+ vp->iov_base= (char*)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(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) {
+ debug("nocheck mode %s", new_nocheck ? "start" : "stop");
+ }
+ nocheck= new_nocheck;
+}
+
+static void article_done(Article *art, int whichcount) {
+ if (!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 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,
+ (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 conn_busy=
+ conn->waiting.count ||
+ conn->priority.count ||
+ conn->sent.count ||
+ conn->xmitu;
+
+ if (conn->quitting) {
+ if (code!=205 && code!=503) {
+ connfail(conn, "peer gave unexpected response to QUIT: %s", sani);
+ } else {
+ notice("C%d idle connection closed by us", conn->fd);
+ assert(!conn_busy);
+ LIST_REMOVE(conns,conn);
+ 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) {
+
+ case 400: PEERBADMSG("peer stopped accepting articles");
+ default: PEERBADMSG("peer sent unexpected message");
+
+ case 503:
+ if (conn_busy) PEERBADMSG("peer timed us out");
+ notice("C%d idle connection closed by peer", conn->fd);
+ LIST_REMOVE(conns,conn);
+ 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;
+ sysfatal("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)
+ die("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;
+ sysdie("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);
+ LIST_ADDTAIL(ipf->queue, art);
+
+ if (ipf->autodefer >= 0)
+ article_autodefer(ipf, art);
+ else 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();
+ return OOP_CONTINUE;
+}
+
+/*========== tailing input file ==========*/
+
+static void *tailing_rable_call_time(oop_source *loop, struct timeval tv,
+ void *user) {
+ InputFile *ipf= user;
+ return ipf->readable_callback(loop, &ipf->readable,
+ ipf->readable_callback_user);
+}
+
+static void tailing_on_cancel(struct oop_readable *rable) {
+ InputFile *ipf= (void*)rable;
+
+ if (ipf->filemon) filemon_stop(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_start(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->rd);
+ assert(sms==sm_SEPARATED || sms==sm_DROPPING);
+ } else if (ipf==backlog_input_file) {
+ assert(ipf->rd);
+ } else {
+ abort();
+ }
+ }
+ tailing_queue_readable(ipf);
+ 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) sysfatal("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;
+
+ 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, 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 (isewouldblock(errno)) 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=%d", ipf, iev.wd);
+ filemon_callback(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);
+
+ debug("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;
+}
+
+static void filemon_callback(InputFile *ipf) {
+ if (ipf && ipf->readable_callback) /* so filepoll() can be naive */
+ ipf->readable_callback(loop, &ipf->readable, ipf->readable_callback_user);
+}
+
+/*---------- 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_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);
+
+ int r= oop_rd_read(ipf->rd, &feedfile_rdstyle, MAX_LINE_FEEDFILE,
+ feedfile_got_article,ipf, feedfile_read_err, ipf);
+ if (r) sysdie("unable start reading feedfile %s",ipf->path);
+}
+
+static void inputfile_reading_stop(InputFile *ipf) {
+ assert(ipf->rd);
+ 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->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) sysfatal("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);
+ fatal("another duct holds the lockfile");
+ }
+ sysfatal("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) sysdie("fdopen lockfile");
+
+ int r= ftruncate(lockfd, 0);
+ if (r) sysdie("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))
+ sysfatal("write info to lockfile %s", path_lock);
+
+ debug("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) {
+ debug("startup: ductdefer ENOENT");
+ } else {
+ debug("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:
+ die("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)) {
+ 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);
+ flushing_input_file= main_input_file;
+ main_input_file= open_input_file(feedfile);
+ if (!main_input_file) die("feedfile vanished during startup");
+ SMS(SEPARATED, max_separated_periods,
+ "found both old and current feed files");
+ } else {
+ debug("startup: F exists, D ENOENT => Normal");
+ InputFile *file_f= open_input_file(feedfile);
+ if (!file_f) die("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);
+
+ debug("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) sysfatal("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(void) { /* => Flushing,FLUSHING, ret 1; or ret 0 */
+ switch (sms) {
+
+ case sm_NORMAL:
+ statemc_start_flush("periodic"); /* Normal => Flushing; => FLUSHING */
+ return 1;
+
+ case sm_FLUSHFAILED:
+ spawn_inndcomm_flush("retry"); /* Moved => Flushing; => FLUSHING */
+ return 1;
+
+ case sm_SEPARATED:
+ case sm_DROPPING:
+ warn("took too long to complete old feedfile after flush, autodeferring");
+ 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();
+ 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"
+ " 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,
+ 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)
+ 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,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) {
+ 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;
+ 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) sysfatal("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)
+ 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);
+
+ int 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;
+
+ struct stat stab;
+ xfstat_isreg(fileno(defer), &stab, path_defer, "defer file");
+
+ if (fclose(defer)) sysfatal("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))
+ 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);
+
+ 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, i;
+ struct stat stab;
+ const char *oldest_path=0;
+ time_t oldest_mtime=0, now;
+
+ if (backlog_input_file) return;