/* * driver.c -- generic driver for mail fetch method protocols * * Copyright 1997 by Eric S. Raymond * For license terms, see the file COPYING in this directory. */ #include "config.h" #include #include #include #include #include #ifdef HAVE_MEMORY_H #include #endif /* HAVE_MEMORY_H */ #if defined(STDC_HEADERS) #include #endif #if defined(HAVE_UNISTD_H) #include #endif #if defined(HAVE_STDARG_H) #include #else #include #endif #if defined(HAVE_ALLOCA_H) #include #else #ifdef _AIX #pragma alloca #endif #endif #if defined(HAVE_SYS_ITIMER_H) #include #endif #include #include #ifndef HAVE_STRFTIME /* For ctime prototype */ #include #include #endif #ifdef HAVE_RES_SEARCH #include #include "mx.h" #endif /* HAVE_RES_SEARCH */ #ifdef KERBEROS_V4 #if defined (__bsdi__) #include /* order of includes matters */ #include #define krb_get_err_text(e) (krb_err_txt[e]) #else #if defined(__NetBSD__) || defined(__FreeBSD__) || defined(__linux__) #define krb_get_err_text(e) (krb_err_txt[e]) #include #include #else #include #include #endif /* ! defined (__FreeBSD__) */ #endif /* ! defined (__bsdi__) */ #include #include #endif /* KERBEROS_V4 */ #ifdef KERBEROS_V5 #include #include #endif /* KERBEROS_V5 */ #include "fetchmail.h" #if INET6 #define SMTP_PORT "smtp" /* standard SMTP service port */ #else /* INET6 */ #define SMTP_PORT 25 /* standard SMTP service port */ #endif /* INET6 */ #ifndef strstr /* glibc-2.1 declares this as a macro */ extern char *strstr(); /* needed on sysV68 R3V7.1. */ #endif /* strstr */ int fetchlimit; /* how often to tear down the server connection */ int batchcount; /* count of messages sent in current batch */ flag peek_capable; /* can we peek for better error recovery? */ int pass; /* how many times have we re-polled? */ int phase; /* where are we, for error-logging purposes? */ static struct method *protocol; static jmp_buf restart; char tag[TAGLEN]; static int tagnum; #define GENSYM (sprintf(tag, "A%04d", ++tagnum % TAGMOD), tag) static char shroud[PASSWORDLEN]; /* string to shroud in debug output */ static int mytimeout; /* value of nonreponse timeout */ static int msglen; /* actual message length */ void set_timeout(int timeleft) /* reset the nonresponse-timeout */ { #ifndef __EMX__ struct itimerval ntimeout; ntimeout.it_interval.tv_sec = ntimeout.it_interval.tv_usec = 0; ntimeout.it_value.tv_sec = timeleft; ntimeout.it_value.tv_usec = 0; setitimer(ITIMER_REAL, &ntimeout, (struct itimerval *)NULL); #endif } static void timeout_handler (int signal) /* handle server-timeout SIGALRM signal */ { longjmp(restart, 1); } static int accept_count, reject_count; static void map_name(name, ctl, xmit_names) /* add given name to xmit_names if it matches declared localnames */ const char *name; /* name to map */ struct query *ctl; /* list of permissible aliases */ struct idlist **xmit_names; /* list of recipient names parsed out */ { const char *lname; int sl; int off = 0; lname = idpair_find(&ctl->localnames, name+off); if (!lname && ctl->wildcard) lname = name+off; if (lname != (char *)NULL) { if (outlevel >= O_VERBOSE) error(0, 0, "mapped %s to local %s", name, lname); save_str(xmit_names, lname, XMIT_ACCEPT); accept_count++; } } void find_server_names(hdr, ctl, xmit_names) /* parse names out of a RFC822 header into an ID list */ const char *hdr; /* RFC822 header in question */ struct query *ctl; /* list of permissible aliases */ struct idlist **xmit_names; /* list of recipient names parsed out */ { if (hdr == (char *)NULL) return; else { char *cp; for (cp = nxtaddr(hdr); cp != NULL; cp = nxtaddr(NULL)) { char *atsign; /* * If the name of the user begins with a qmail virtual * domain prefix, ignore the prefix. Doing this here * means qvirtual will work either with ordinary name * mapping or with a localdomains option. */ if (ctl->server.qvirtual) { int sl = strlen(ctl->server.qvirtual); if (!strncasecmp(cp, ctl->server.qvirtual, sl)) cp += sl; } if ((atsign = strchr(cp, '@'))) { struct idlist *idp; /* * Does a trailing segment of the hostname match something * on the localdomains list? If so, save the whole name * and keep going. */ for (idp = ctl->server.localdomains; idp; idp = idp->next) { char *rhs; rhs = atsign + (strlen(atsign) - strlen(idp->id)); if (rhs > atsign && (rhs[-1] == '.' || rhs[-1] == '@') && strcasecmp(rhs, idp->id) == 0) { if (outlevel >= O_VERBOSE) error(0, 0, "passed through %s matching %s", cp, idp->id); save_str(xmit_names, cp, XMIT_ACCEPT); accept_count++; goto nomap; } } /* if we matched a local domain, idp != NULL */ if (!idp) { /* * Check to see if the right-hand part is an alias * or MX equivalent of the mailserver. If it's * not, skip this name. If it is, we'll keep * going and try to find a mapping to a client name. */ if (!is_host_alias(atsign+1, ctl)) { save_str(xmit_names, cp, XMIT_REJECT); reject_count++; continue; } } atsign[0] = '\0'; map_name(cp, ctl, xmit_names); nomap:; } } } } static char *parse_received(struct query *ctl, char *bufp) /* try to extract real address from the Received line */ /* If a valid Received: line is found, we return the full address in * a buffer which can be parsed from nxtaddr(). This is to ansure that * the local domain part of the address can be passed along in * find_server_names() if it contains one. * Note: We should return a dummy header containing the address * which makes nxtaddr() behave correctly. */ { char *ok = (char *)NULL; static char rbuf[HOSTLEN + USERNAMELEN + 4]; if (outlevel >= O_DEBUG) error(0, 0, "analyzing Received line:\n%s", bufp); /* * Try to extract the real envelope addressee. We look here * specifically for the mailserver's Received line. * Note: this will only work for sendmail, or an MTA that * shares sendmail's convention for embedding the envelope * address in the Received line. Sendmail itself only * does this when the mail has a single recipient. */ if ((ok = strstr(bufp, "by ")) && isspace(ok[-1])) { char *sp, *tp; /* extract space-delimited token after "by " */ for (sp = ok + 3; isspace(*sp); sp++) continue; tp = rbuf; for (; !isspace(*sp); sp++) *tp++ = *sp; *tp = '\0'; /* * If it's a DNS name of the mail server, look for the * recipient name after a following "for". Otherwise * punt. */ if (is_host_alias(rbuf, ctl)) { if (outlevel >= O_DEBUG) error(0, 0, "line accepted, %s is an alias of the mailserver", rbuf); } else { if (outlevel >= O_DEBUG) error(0, 0, "line rejected, %s is not an alias of the mailserver", rbuf); return(NULL); } if ((ok = strstr(sp, "for ")) && isspace(ok[-1])) { flag want_gt = FALSE; tp = rbuf; sp = ok + 4; *tp++ = ':'; /* Here is the hack. This is to be friends */ *tp++ = ' '; /* with nxtaddr()... */ if (*sp == '<') { want_gt = TRUE; sp++; } while (*sp == '@') /* skip routes */ while (*sp && *sp++ != ':') continue; while (*sp && (want_gt ? (*sp != '>') : !isspace(*sp)) && *sp != ';') if (!isspace(*sp)) *tp++ = *sp++; else { /* uh oh -- whitespace here can't be right! */ ok = (char *)NULL; break; } *tp++ = '\n'; *tp = '\0'; if (strlen(rbuf) <= 3) /* apparently nothing has been found */ ok = NULL; } else ok = (char *)NULL; } if (!ok) { if (outlevel >= O_VERBOSE) error(0, 0, "no Received address found"); return(NULL); } else { if (outlevel >= O_VERBOSE) { char *lf = rbuf + strlen(rbuf)-1; *lf = '\0'; if (outlevel >= O_VERBOSE) error(0, 0, "found Received address `%s'", rbuf+2); *lf = '\n'; } return(rbuf); } } /* shared by readheaders and readbody */ static int sizeticker; #define EMPTYLINE(s) ((s)[0] == '\r' && (s)[1] == '\n' && (s)[2] == '\0') static int readheaders(sock, fetchlen, reallen, ctl, num) /* read message headers and ship to SMTP or MDA */ int sock; /* to which the server is connected */ long fetchlen; /* length of message according to fetch response */ long reallen; /* length of message according to getsizes */ struct query *ctl; /* query control record */ int num; /* index of message */ { struct addrblk { int offset; struct addrblk *next; }; struct addrblk *to_addrchain = NULL; struct addrblk **to_chainptr = &to_addrchain; struct addrblk *resent_to_addrchain = NULL; struct addrblk **resent_to_chainptr = &resent_to_addrchain; char buf[MSGBUFSIZE+1]; char return_path[HOSTLEN + USERNAMELEN + 4]; int from_offs, reply_to_offs, resent_from_offs; int app_from_offs, sender_offs, resent_sender_offs; int env_offs; char *headers, *received_for, *rcv, *cp; int n, linelen, oldlen, ch, remaining, skipcount; struct idlist *idp, *xmit_names; flag no_local_matches = FALSE; flag headers_ok, has_nuls; int olderrs, good_addresses, bad_addresses; sizeticker = 0; has_nuls = headers_ok = FALSE; return_path[0] = '\0'; olderrs = ctl->errcount; /* read message headers */ headers = received_for = NULL; from_offs = reply_to_offs = resent_from_offs = app_from_offs = sender_offs = resent_sender_offs = env_offs = -1; oldlen = 0; msglen = 0; skipcount = 0; ctl->mimemsg = 0; for (remaining = fetchlen; remaining > 0 || protocol->delimited; remaining -= linelen) { char *line; line = xmalloc(sizeof(buf)); linelen = 0; line[0] = '\0'; do { set_timeout(mytimeout); if ((n = SockRead(sock, buf, sizeof(buf)-1)) == -1) { set_timeout(0); free(line); free(headers); return(PS_SOCKET); } set_timeout(0); linelen += n; msglen += n; /* lines may not be properly CRLF terminated; fix this for qmail */ if (ctl->forcecr) { cp = buf + strlen(buf) - 1; if (*cp == '\n' && (cp == buf || cp[-1] != '\r')) { *cp++ = '\r'; *cp++ = '\n'; *cp++ = '\0'; } } line = (char *) realloc(line, strlen(line) + strlen(buf) +1); strcat(line, buf); /* check for end of headers */ if (EMPTYLINE(line)) { headers_ok = TRUE; has_nuls = (linelen != strlen(line)); free(line); goto process_headers; } /* * Check for end of message immediately. If one of your folders * has been mangled, the delimiter may occur directly after the * header. */ if (protocol->delimited && line[0] == '.' && EMPTYLINE(line+1)) { free(line); has_nuls = (linelen != strlen(line)); goto process_headers; } } while /* we may need to grab RFC822 continuations */ ((ch = SockPeek(sock)) == ' ' || ch == '\t'); /* write the message size dots */ if ((outlevel > O_SILENT && outlevel < O_VERBOSE) && linelen > 0) { sizeticker += linelen; while (sizeticker >= SIZETICKER) { error_build("."); sizeticker -= SIZETICKER; } } /* we see an ordinary (non-header, non-message-delimiter line */ has_nuls = (linelen != strlen(line)); /* * The University of Washington IMAP server (the reference * implementation of IMAP4 written by Mark Crispin) relies * on being able to keep base-UID information in a special * message at the head of the mailbox. This message should * neither be deleted nor forwarded. */ #ifdef POP2_ENABLE /* * We disable this check under POP2 because there's no way to * prevent deletion of the message. So at least we ought to * forward it to the user so he or she will have some clue * that things have gone awry. */ if (protocol->port != 109) #endif /* POP2_ENABLE */ if (num == 1 && !strncasecmp(line, "X-IMAP:", 7)) { free(line); free(headers); return(PS_RETAINED); } /* * This code prevents fetchmail from becoming an accessory after * the fact to upstream sendmails with the `E' option on. It also * copes with certain brain-dead POP servers (like NT's) that pass * through Unix from_ lines. * * Either of these bugs can result in a non-RFC822 line at the * beginning of the headers. If fetchmail just passes it * through, the client listener may think the message has *no* * headers (since the first) line it sees doesn't look * RFC822-conformant) and fake up a set. * * What the user would see in this case is bogus (synthesized) * headers, followed by a blank line, followed by the >From, * followed by the real headers, followed by a blank line, * followed by text. * * We forestall this lossage by tossing anything that looks * like an escaped or passed-through From_ line in headers. * These aren't RFC822 so our conscience is clear... */ if (!strncasecmp(line, ">From ", 6) || !strncasecmp(line, "From ", 5)) { free(line); continue; } /* * If we see a Status line, it may have been inserted by an MUA * on the mail host, or it may have been inserted by the server * program after the headers in the transaction stream. This * can actually hose some new-mail notifiers such as xbuffy, * which assumes any Status line came from a *local* MDA and * therefore indicates that the message has been seen. * * Some buggy POP servers (including at least the 3.3(20) * version of the one distributed with IMAP) insert empty * Status lines in the transaction stream; we'll chuck those * unconditionally. Nonempty ones get chucked if the user * turns on the dropstatus flag. */ { char *cp; if (!strncasecmp(line, "Status:", 7)) cp = line + 7; else if (!strncasecmp(line, "X-Mozilla-Status:", 17)) cp = line + 17; else cp = NULL; if (cp) { while (*cp && isspace(*cp)) cp++; if (!*cp || ctl->dropstatus) { free(line); continue; } } } if (ctl->rewrite) line = reply_hack(line, ctl->server.truename); /* * OK, this is messy. If we're forwarding by SMTP, it's the * SMTP-receiver's job (according to RFC821, page 22, section * 4.1.1) to generate a Return-Path line on final delivery. * The trouble is, we've already got one because the * mailserver's SMTP thought *it* was responsible for final * delivery. * * Stash away the contents of Return-Path for use in generating * MAIL FROM later on, then prevent the header from being saved * with the others. In effect, we strip it off here. * * If the SMTP server conforms to the standards, and fetchmail gets the * envelope sender from the Return-Path, the new Return-Path should be * exactly the same as the original one. * * We do *not* want to ignore empty Return-Path headers. These should * be passed through as a way of indicating that a message should * not trigger bounces if delivery fails. What we *do* need to do is * make sure we never try to rewrite such a blank Return-Path. We * handle this with a check for <> in the rewrite logic. * * If the Return-Path header has no host part, tack on "@localhost" * in order to pacify sendmails that want to see an FQDN. */ if (!strncasecmp("Return-Path:", line, 12) && (cp = nxtaddr(line))) { strcpy(return_path, cp); if (!strchr(return_path, '@')) strcat(return_path, "@localhost"); if (!ctl->mda) { free(line); continue; } } if (!headers) { oldlen = strlen(line); headers = xmalloc(oldlen + 1); (void) strcpy(headers, line); free(line); line = headers; } else { int newlen; newlen = oldlen + strlen(line); headers = (char *) realloc(headers, newlen + 1); if (headers == NULL) { free(line); return(PS_IOERR); } strcpy(headers + oldlen, line); free(line); line = headers + oldlen; oldlen = newlen; } if (!strncasecmp("From:", line, 5)) from_offs = (line - headers); else if (!strncasecmp("Reply-To:", line, 9)) reply_to_offs = (line - headers); else if (!strncasecmp("Resent-From:", line, 12)) resent_from_offs = (line - headers); else if (!strncasecmp("Apparently-From:", line, 16)) app_from_offs = (line - headers); else if (!strncasecmp("Sender:", line, 7)) sender_offs = (line - headers); else if (!strncasecmp("Resent_Sender:", line, 14)) resent_sender_offs = (line - headers); else if (!strncasecmp("Message-Id:", buf, 11)) { if (ctl->server.uidl) { char id[IDLEN+1]; buf[IDLEN+12] = 0; /* prevent stack overflow */ sscanf(buf+12, "%s", id); if (!str_find( &ctl->newsaved, num)) { struct idlist *new = save_str(&ctl->newsaved,id,UID_SEEN); new->val.status.num = num; } } } else if (!MULTIDROP(ctl)) continue; else if (!strncasecmp("To:", line, 3) || !strncasecmp("Cc:", line, 3) || !strncasecmp("Bcc:", line, 4) || !strncasecmp("Apparently-To:", line, 14)) { *to_chainptr = xmalloc(sizeof(struct addrblk)); (*to_chainptr)->offset = (line - headers); to_chainptr = &(*to_chainptr)->next; *to_chainptr = NULL; } else if (!strncasecmp("Resent-To:", line, 10) || !strncasecmp("Resent-Cc:", line, 10) || !strncasecmp("Resent-Bcc:", line, 11)) { *resent_to_chainptr = xmalloc(sizeof(struct addrblk)); (*resent_to_chainptr)->offset = (line - headers); resent_to_chainptr = &(*resent_to_chainptr)->next; *resent_to_chainptr = NULL; } else if (ctl->server.envelope != STRING_DISABLED) { if (ctl->server.envelope && strcasecmp(ctl->server.envelope, "Received")) { if (env_offs == -1 && !strncasecmp(ctl->server.envelope, line, strlen(ctl->server.envelope))) { if (skipcount++ != ctl->server.envskip) continue; env_offs = (line - headers); } } else if (!received_for && !strncasecmp("Received:", line, 9)) { if (skipcount++ != ctl->server.envskip) continue; received_for = parse_received(ctl, line); } } } process_headers: /* * We want to detect this early in case there are so few headers that the * dispatch logic barfs. */ if (!headers_ok) { if (outlevel > O_SILENT) error(0,0,"message delimiter found while scanning headers"); } /* * Hack time. If the first line of the message was blank, with no headers * (this happens occasionally due to bad gatewaying software) cons up * a set of fake headers. * * If you modify the fake header template below, be sure you don't * make either From or To address @-less, otherwise the reply_hack * logic will do bad things. */ if (headers == (char *)NULL) { #ifdef HAVE_SNPRINTF snprintf(buf, sizeof(buf), #else sprintf(buf, #endif /* HAVE_SNPRINTF */ "From: FETCHMAIL-DAEMON\r\nTo: %s@%s\r\nSubject: Headerless mail from %s's mailbox on %s\r\n", user, fetchmailhost, ctl->remotename, ctl->server.truename); headers = xstrdup(buf); } /* * We can now process message headers before reading the text. * In fact we have to, as this will tell us where to forward to. */ /* Decode MIME encoded headers. We MUST do this before * looking at the Content-Type / Content-Transfer-Encoding * headers (RFC 2046). */ if (ctl->mimedecode) { UnMimeHeader(headers); } /* Check for MIME headers indicating possible 8-bit data */ ctl->mimemsg = MimeBodyType(headers, ctl->mimedecode); /* * If there is a Return-Path address on the message, this was * almost certainly the MAIL FROM address given the originating * sendmail. This is the best thing to use for logging the * message origin (it sets up the right behavior for bounces and * mailing lists). Otherwise, fall down to the next available * envelope address (which is the most probable real sender). * *** The order is important! *** * This is especially useful when receiving mailing list * messages in multidrop mode. if a local address doesn't * exist, the bounce message won't be returned blindly to the * author or to the list itself but rather to the list manager * (ex: specified by "Sender:") which is much less annoying. This * is true for most mailing list packages. */ if( !return_path[0] ){ char *ap = NULL; if (resent_sender_offs >= 0 && (ap = nxtaddr(headers + resent_sender_offs))); else if (sender_offs >= 0 && (ap = nxtaddr(headers + sender_offs))); else if (resent_from_offs >= 0 && (ap = nxtaddr(headers + resent_from_offs))); else if (from_offs >= 0 && (ap = nxtaddr(headers + from_offs))); else if (reply_to_offs >= 0 && (ap = nxtaddr(headers + reply_to_offs))); else if (app_from_offs >= 0 && (ap = nxtaddr(headers + app_from_offs))); if (ap) strcpy( return_path, ap ); } /* cons up a list of local recipients */ xmit_names = (struct idlist *)NULL; accept_count = reject_count = 0; /* is this a multidrop box? */ if (MULTIDROP(ctl)) { if (env_offs > -1) /* We have the actual envelope addressee */ find_server_names(headers + env_offs, ctl, &xmit_names); else if (received_for) /* * We have the Received for addressee. * It has to be a mailserver address, or we * wouldn't have got here. * We use find_server_names() to let local * hostnames go through. */ find_server_names(received_for, ctl, &xmit_names); #ifdef SDPS_ENABLE else if (sdps_envto) { find_server_names(sdps_envto, ctl, &xmit_names); free(sdps_envto); } #endif /* SDPS_ENABLE */ else { /* * We haven't extracted the envelope address. * So check all the "Resent-To" header addresses if * they exist. If and only if they don't, consider * the "To" adresses. */ register struct addrblk *nextptr; if (resent_to_addrchain) { /* delete the "To" chain and substitute it * with the "Resent-To" list */ while (to_addrchain) { nextptr = to_addrchain->next; free(to_addrchain); to_addrchain = nextptr; } to_addrchain = resent_to_addrchain; resent_to_addrchain = NULL; } /* now look for remaining adresses */ while (to_addrchain) { find_server_names(headers+to_addrchain->offset, ctl, &xmit_names); nextptr = to_addrchain->next; free(to_addrchain); to_addrchain = nextptr; } } if (!accept_count) { no_local_matches = TRUE; save_str(&xmit_names, run.postmaster, XMIT_ACCEPT); if (outlevel >= O_VERBOSE) error(0, 0, "no local matches, forwarding to %s", run.postmaster); } } else /* it's a single-drop box, use first localname */ save_str(&xmit_names, ctl->localnames->id, XMIT_ACCEPT); /* * Time to either address the message or decide we can't deliver it yet. */ if (ctl->errcount > olderrs) /* there were DNS errors above */ { if (outlevel >= O_VERBOSE) error(0,0, "forwarding and deletion suppressed due to DNS errors"); free(headers); free_str_list(&xmit_names); return(PS_TRANSIENT); } else { /* set up sinkfp so we can deliver the message body through it */ if ((n = open_sink(ctl, return_path, xmit_names, reallen, &good_addresses, &bad_addresses)) != PS_SUCCESS) { free(headers); free_str_list(&xmit_names); return(n); } } n = 0; /* * Some server/sendmail combinations cause problems when our * synthetic Received line is before the From header. Cope * with this... */ if ((rcv = strstr(headers, "Received:")) == (char *)NULL) rcv = headers; /* handle ">Received:" lines too */ while (rcv > headers && rcv[-1] != '\n') rcv--; if (rcv > headers) { char c = *rcv; *rcv = '\0'; n = stuffline(ctl, headers); *rcv = c; } if (!run.invisible && n != -1) { /* utter any per-message Received information we need here */ sprintf(buf, "Received: from %s\n", ctl->server.truename); n = stuffline(ctl, buf); if (n != -1) { /* * We used to include ctl->remotename in this log line, * but this can be secure information that would be bad * to reveal. */ sprintf(buf, "\tby fetchmail-%s %s\n", RELEASE_ID, protocol->name); n = stuffline(ctl, buf); if (n != -1) { time_t now; buf[0] = '\t'; if (good_addresses == 0) { sprintf(buf+1, "for <%s@%s> (by default); ", user, ctl->destaddr); } else if (good_addresses == 1) { for (idp = xmit_names; idp; idp = idp->next) if (idp->val.status.mark == XMIT_ACCEPT) break; /* only report first address */ if (strchr(idp->id, '@')) sprintf(buf+1, "for <%s>", idp->id); else sprintf(buf+1, "for <%s/%s>", idp->id, ctl->destaddr); sprintf(buf+strlen(buf), " (%s); ", MULTIDROP(ctl) ? "multi-drop" : "single-drop"); } else buf[1] = '\0'; time(&now); #ifdef HAVE_STRFTIME /* * Conform to RFC822. This is typically going to emit * a three-letter timezone for %Z, which is going to * be marked "obsolete syntax" in 822bis. Note that we * generate a 4-digit year here. */ strftime(buf + strlen(buf), sizeof(buf) - strlen(buf), "%a, %d %b %Y %H:%M:%S %Z\n", localtime(&now)); #else /* * This is really just a portability fallback, as the * date format ctime(3) emits is not RFC822 * conformant. */ strcat(buf, ctime(&now)); #endif /* HAVE_STRFTIME */ n = stuffline(ctl, buf); } } } if (n != -1) n = stuffline(ctl, rcv); /* ship out rest of headers */ if (n == -1) { error(0, errno, "writing RFC822 headers"); release_sink(ctl); free(headers); free_str_list(&xmit_names); return(PS_IOERR); } else if (!run.use_syslog && outlevel >= O_VERBOSE) fputs("#", stderr); /* write error notifications */ if (no_local_matches || has_nuls || bad_addresses) { int errlen = 0; char errhd[USERNAMELEN + POPBUFSIZE], *errmsg; errmsg = errhd; (void) strcpy(errhd, "X-Fetchmail-Warning: "); if (no_local_matches) { if (reject_count != 1) strcat(errhd, "no recipient addresses matched declared local names"); else { for (idp = xmit_names; idp; idp = idp->next) if (idp->val.status.mark == XMIT_REJECT) break; sprintf(errhd+strlen(errhd), "recipient address %s didn't match any local name", idp->id); } } if (has_nuls) { if (errhd[sizeof("X-Fetchmail-Warning: ")]) strcat(errhd, "; "); strcat(errhd, "message has embedded NULs"); } if (bad_addresses) { if (errhd[sizeof("X-Fetchmail-Warning: ")]) strcat(errhd, "; "); strcat(errhd, "SMTP listener rejected local recipient addresses: "); errlen = strlen(errhd); for (idp = xmit_names; idp; idp = idp->next) if (idp->val.status.mark == XMIT_ANTISPAM) errlen += strlen(idp->id) + 2; errmsg = alloca(errlen+3); (void) strcpy(errmsg, errhd); for (idp = xmit_names; idp; idp = idp->next) if (idp->val.status.mark == XMIT_ANTISPAM) { strcat(errmsg, idp->id); if (idp->next) strcat(errmsg, ", "); } } strcat(errmsg, "\n"); /* ship out the error line */ stuffline(ctl, errmsg); } /* issue the delimiter line */ cp = buf; *cp++ = '\r'; *cp++ = '\n'; *cp++ = '\0'; stuffline(ctl, buf); free(headers); free_str_list(&xmit_names); return(headers_ok ? PS_SUCCESS : PS_TRUNCATED); } static int readbody(sock, ctl, forward, len) /* read and dispose of a message body presented on sock */ struct query *ctl; /* query control record */ int sock; /* to which the server is connected */ int len; /* length of message */ flag forward; /* TRUE to forward */ { int linelen; unsigned char buf[MSGBUFSIZE+4]; unsigned char *inbufp = buf; flag issoftline = FALSE; /* pass through the text lines */ while (protocol->delimited || len > 0) { set_timeout(mytimeout); if ((linelen = SockRead(sock, inbufp, sizeof(buf)-4-(inbufp-buf)))==-1) { set_timeout(0); release_sink(ctl); return(PS_SOCKET); } set_timeout(0); /* write the message size dots */ if (linelen > 0) { sizeticker += linelen; while (sizeticker >= SIZETICKER) { if (!run.use_syslog && outlevel > O_SILENT) error_build("."); sizeticker -= SIZETICKER; } } len -= linelen; /* check for end of message */ if (protocol->delimited && *inbufp == '.') if (inbufp[1] == '\r' && inbufp[2] == '\n' && inbufp[3] == '\0') break; else if (inbufp[1] == '\n' && inbufp[2] == '\0') break; else msglen--; /* subtract the size of the dot escape */ msglen += linelen; if (ctl->mimedecode && (ctl->mimemsg & MSG_NEEDS_DECODE)) { issoftline = UnMimeBodyline(&inbufp, (protocol->delimited && issoftline)); if (issoftline && (sizeof(buf)-1-(inbufp-buf) < 200)) { /* * Soft linebreak, but less than 200 bytes left in * input buffer. Rather than doing a buffer overrun, * ignore the soft linebreak, NL-terminate data and * deliver what we have now. * (Who writes lines longer than 2K anyway?) */ *inbufp = '\n'; *(inbufp+1) = '\0'; issoftline = 0; } } /* ship out the text line */ if (forward && (!issoftline)) { int n; inbufp = buf; /* guard against very long lines */ buf[MSGBUFSIZE+1] = '\r'; buf[MSGBUFSIZE+2] = '\n'; buf[MSGBUFSIZE+3] = '\0'; n = stuffline(ctl, buf); if (n < 0) { error(0, errno, "writing message text"); release_sink(ctl); return(PS_IOERR); } else if (outlevel >= O_VERBOSE) fputc('*', stderr); } } return(PS_SUCCESS); } #ifdef KERBEROS_V4 int kerberos_auth (socket, canonical) /* authenticate to the server host using Kerberos V4 */ int socket; /* socket to server host */ #ifdef __FreeBSD__ char *canonical; /* server name */ #else const char *canonical; /* server name */ #endif { char * host_primary; KTEXT ticket; MSG_DAT msg_data; CREDENTIALS cred; Key_schedule schedule; int rem; ticket = ((KTEXT) (alloca (sizeof (KTEXT_ST)))); rem = (krb_sendauth (0L, socket, ticket, "pop", canonical, ((char *) (krb_realmofhost (canonical))), ((unsigned long) 0), (&msg_data), (&cred), (schedule), ((struct sockaddr_in *) 0), ((struct sockaddr_in *) 0), "KPOPV0.1")); if (rem != KSUCCESS) { error(0, -1, "kerberos error %s", (krb_get_err_text (rem))); return (PS_AUTHFAIL); } return (0); } #endif /* KERBEROS_V4 */ #ifdef KERBEROS_V5 int kerberos5_auth(socket, canonical) /* authernticate to the server host using Kerberos V5 */ int socket; /* socket to server host */ const char *canonical; /* server name */ { krb5_error_code retval; krb5_context context; krb5_ccache ccdef; krb5_principal client = NULL, server = NULL; krb5_error *err_ret = NULL; krb5_auth_context auth_context = NULL; krb5_init_context(&context); krb5_init_ets(context); krb5_auth_con_init(context, &auth_context); if (retval = krb5_cc_default(context, &ccdef)) { error(0, 0, "krb5_cc_default: %s", error_message(retval)); return(PS_ERROR); } if (retval = krb5_cc_get_principal(context, ccdef, &client)) { error(0, 0, "krb5_cc_get_principal: %s", error_message(retval)); return(PS_ERROR); } if (retval = krb5_sname_to_principal(context, canonical, "pop", KRB5_NT_UNKNOWN, &server)) { error(0, 0, "krb5_sname_to_principal: %s", error_message(retval)); return(PS_ERROR); } retval = krb5_sendauth(context, &auth_context, (krb5_pointer) &socket, "KPOPV1.0", client, server, AP_OPTS_MUTUAL_REQUIRED, NULL, /* no data to checksum */ 0, /* no creds, use ccache instead */ ccdef, &err_ret, 0, NULL); /* don't need reply */ krb5_free_principal(context, server); krb5_free_principal(context, client); krb5_auth_con_free(context, auth_context); if (retval) { if (err_ret && err_ret->text.length) { error(0, 0, "krb5_sendauth: %s [server says '%*s'] ", error_message(retval), err_ret->text.length, err_ret->text.data); krb5_free_error(context, err_ret); } else error(0, 0, "krb5_sendauth: %s", error_message(retval)); return(PS_ERROR); } return 0; } #endif /* KERBEROS_V5 */ static void clean_skipped_list(struct idlist **skipped_list) /* struct "idlist" contains no "prev" ptr; we must remove unused items first */ { struct idlist *current=NULL, *prev=NULL, *tmp=NULL, *head=NULL; prev = current = head = *skipped_list; if (!head) return; do { /* if item has no reference, remove it */ if (current && current->val.status.mark == 0) { if (current == head) /* remove first item (head) */ { head = current->next; if (current->id) free(current->id); free(current); prev = current = head; } else /* remove middle/last item */ { tmp = current->next; prev->next = tmp; if (current->id) free(current->id); free(current); current = tmp; } } else /* skip this item */ { prev = current; current = current->next; } } while(current); *skipped_list = head; } static void send_warning(struct query *ctl) /* send warning mail with skipped msg; reset msg count when user notified */ { int size, nbr; int msg_to_send = FALSE; FILE *tmpfile = NULL; struct idlist *head=NULL, *current=NULL; int max_warning_poll_count, good, bad; char buf[100]; head = ctl->skipped; if (!head) return; /* don't start a notification message unless we need to */ for (current = head; current; current = current->next) if (current->val.status.num == 0 && current->val.status.mark) msg_to_send = TRUE; if (!msg_to_send) return; /* * There's no good way to recover if we can't send notification mail, * but it's not a disaster, either, since the skipped mail will not * be deleted. * * We give a null address list here because we actually *want* * this message to go to run.postmaster. The zero length means * we won't pass a SIZE option to ESMTP; the message length would * be more trouble than it's worth to compute. */ if (open_sink(ctl, "FETCHMAIL-DAEMON", NULL, 0, &good, &bad)) return; /* stuffline() requires its input to be writeable for CR stripping */ #define OVERHD "Subject: Fetchmail WARNING.\r\n\r\nThe following oversized messages remain on the mail server:\n\r\n" strcpy(buf, OVERHD); stuffline(ctl, buf); if (run.poll_interval == 0) max_warning_poll_count = 0; else max_warning_poll_count = ctl->warnings/run.poll_interval; /* parse list of skipped msg, adding items to the mail */ for (current = head; current; current = current->next) { if (current->val.status.num == 0 && current->val.status.mark) { nbr = current->val.status.mark; size = atoi(current->id); sprintf(buf, "\t%d msg %d octets long skipped by fetchmail.\n", nbr, size); stuffline(ctl, buf); } current->val.status.num++; current->val.status.mark = 0; if (current->val.status.num >= max_warning_poll_count) current->val.status.num = 0; } close_sink(ctl, TRUE); } int do_protocol(ctl, proto) /* retrieve messages from server using given protocol method table */ struct query *ctl; /* parsed options with merged-in defaults */ const struct method *proto; /* protocol method table */ { int ok, js, sock = -1; char *msg; void (*sigsave)(); struct idlist *current=NULL, *prev=NULL, *next=NULL, *head=NULL, *tmp=NULL; protocol = (struct method *)proto; ctl->server.base_protocol = protocol; #ifndef KERBEROS_V4 if (ctl->server.preauthenticate == A_KERBEROS_V4) { error(0, -1, "Kerberos V4 support not linked."); return(PS_ERROR); } #endif /* KERBEROS_V4 */ #ifndef KERBEROS_V5 if (ctl->server.preauthenticate == A_KERBEROS_V5) { error(0, -1, "Kerberos V5 support not linked."); return(PS_ERROR); } #endif /* KERBEROS_V5 */ /* lacking methods, there are some options that may fail */ if (!proto->is_old) { /* check for unsupported options */ if (ctl->flush) { error(0, 0, "Option --flush is not supported with %s", proto->name); return(PS_SYNTAX); } else if (ctl->fetchall) { error(0, 0, "Option --all is not supported with %s", proto->name); return(PS_SYNTAX); } } if (!proto->getsizes && NUM_SPECIFIED(ctl->limit)) { error(0, 0, "Option --limit is not supported with %s", proto->name); return(PS_SYNTAX); } pass = 0; tagnum = 0; tag[0] = '\0'; /* nuke any tag hanging out from previous query */ ok = 0; /* set up the server-nonresponse timeout */ sigsave = signal(SIGALRM, timeout_handler); mytimeout = ctl->server.timeout; if ((js = setjmp(restart)) == 1) { if (phase == OPEN_WAIT) error(0, 0, "timeout after %d seconds waiting to connect to server %s.", ctl->server.timeout, ctl->server.pollname); else if (phase == SERVER_WAIT) error(0, 0, "timeout after %d seconds waiting for server %s.", ctl->server.timeout, ctl->server.pollname); else if (phase == FORWARDING_WAIT) error(0, 0, "timeout after %d seconds waiting for %s.", ctl->server.timeout, ctl->mda ? "MDA" : "SMTP"); else if (phase == LISTENER_WAIT) error(0, 0, "timeout after %d seconds waiting for listener to respond."); else error(0, 0, "timeout after %d seconds.", ctl->server.timeout); release_sink(ctl); if (ctl->smtp_socket != -1) close(ctl->smtp_socket); if (sock != -1) SockClose(sock); ok = PS_ERROR; } else { char buf [POPBUFSIZE+1], *realhost; int *msgsizes, len, num, count, new, bytes, deletions = 0; #if INET6 int fetches, dispatches; #else /* INET6 */ int port, fetches, dispatches, oldphase; #endif /* INET6 */ struct idlist *idp; /* execute pre-initialization command, if any */ if (ctl->preconnect && (ok = system(ctl->preconnect))) { sprintf(buf, "pre-connection command failed with status %d", ok); error(0, 0, buf); ok = PS_SYNTAX; goto closeUp; } /* open a socket to the mail server */ oldphase = phase; phase = OPEN_WAIT; set_timeout(mytimeout); #if !INET6 port = ctl->server.port ? ctl->server.port : protocol->port; #endif /* !INET6 */ realhost = ctl->server.via ? ctl->server.via : ctl->server.pollname; #if INET6 if ((sock = SockOpen(realhost, ctl->server.service ? ctl->server.service : protocol->service, ctl->server.netsec)) == -1) #else /* INET6 */ if ((sock = SockOpen(realhost, port, NULL)) == -1) #endif /* INET6 */ { #if !INET6 #ifndef EHOSTUNREACH #define EHOSTUNREACH (-1) #endif if (outlevel >= O_VERBOSE || errno != EHOSTUNREACH) { error_build("fetchmail: %s connection to %s failed: ", protocol->name, ctl->server.pollname); #ifdef HAVE_RES_SEARCH if (h_errno == HOST_NOT_FOUND) error_complete(0, 0, "host is unknown"); else if (h_errno == NO_ADDRESS) error_complete(0, 0, "name is valid but has no IP address"); else if (h_errno == NO_RECOVERY) error_complete(0, 0, "unrecoverable name server error"); else if (h_errno == TRY_AGAIN) error_complete(0, 0, "temporary name server error"); else if (h_errno) error_complete(0, 0, "unknown DNS error %d", h_errno); else #endif /* HAVE_RES_SEARCH */ error_complete(0, errno, "local error"); } #endif /* INET6 */ ok = PS_SOCKET; set_timeout(0); phase = oldphase; goto closeUp; } set_timeout(0); phase = oldphase; #ifdef KERBEROS_V4 if (ctl->server.preauthenticate == A_KERBEROS_V4) { set_timeout(mytimeout); ok = kerberos_auth(sock, ctl->server.truename); set_timeout(0); if (ok != 0) goto cleanUp; } #endif /* KERBEROS_V4 */ #ifdef KERBEROS_V5 if (ctl->server.preauthenticate == A_KERBEROS_V5) { set_timeout(mytimeout); ok = kerberos5_auth(sock, ctl->server.truename); set_timeout(0); if (ok != 0) goto cleanUp; } #endif /* KERBEROS_V5 */ /* accept greeting message from mail server */ ok = (protocol->parse_response)(sock, buf); if (ok != 0) goto cleanUp; /* try to get authorized to fetch mail */ if (protocol->getauth) { if (protocol->password_canonify) (protocol->password_canonify)(shroud, ctl->password); else strcpy(shroud, ctl->password); ok = (protocol->getauth)(sock, ctl, buf); if (ok != 0) { if (ok == PS_LOCKBUSY) error(0, -1, "Lock-busy error on %s@%s", ctl->remotename, ctl->server.truename); else { if (ok == PS_ERROR) ok = PS_AUTHFAIL; error(0, -1, "Authorization failure on %s@%s", ctl->remotename, ctl->server.truename); } goto cleanUp; } } ctl->errcount = fetches = 0; /* now iterate over each folder selected */ for (idp = ctl->mailboxes; idp; idp = idp->next) { pass = 0; do { dispatches = 0; ++pass; if (outlevel >= O_VERBOSE) if (idp->id) error(0, 0, "selecting or re-polling folder %s", idp->id); else error(0, 0, "selecting or re-polling default folder"); /* compute # of messages and number of new messages waiting */ ok = (protocol->getrange)(sock, ctl, idp->id, &count, &new, &bytes); if (ok != 0) goto cleanUp; /* * We need the size of each message before it's * loaded in order to pass via the ESMTP SIZE * option. If the protocol has a getsizes method, * we presume this means it doesn't get reliable * sizes from message fetch responses. */ if (count > 0 && proto->getsizes) { int i; msgsizes = (int *)alloca(sizeof(int) * count); for (i = 0; i < count; i++) msgsizes[i] = -1; ok = (proto->getsizes)(sock, count, msgsizes); if (ok != 0) goto cleanUp; if (bytes == -1) { bytes = 0; for (i = 0; i < count; i++) bytes += msgsizes[i]; } } /* show user how many messages we downloaded */ if (idp->id) (void) sprintf(buf, "%s at %s (folder %s)", ctl->remotename, ctl->server.truename, idp->id); else (void) sprintf(buf, "%s at %s", ctl->remotename, ctl->server.truename); if (outlevel > O_SILENT) if (count == -1) /* only used for ETRN */ error(0, 0, "Polling %s", ctl->server.truename); else if (count != 0) { if (new != -1 && (count - new) > 0) error_build("%d message%s (%d seen) for %s", count, count > 1 ? "s" : "", count-new, buf); else error_build("%d message%s for %s", count, count > 1 ? "s" : "", buf); if (bytes == -1) error_complete(0, 0, "."); else error_complete(0, 0, " (%d octets).", bytes); } else { /* these are pointless in normal daemon mode */ if (pass == 1 && (run.poll_interval == 0 || outlevel >= O_VERBOSE)) error(0, 0, "No mail for %s", buf); } /* very important, this is where we leave the do loop */ if (count == 0) break; if (check_only) { if (new == -1 || ctl->fetchall) new = count; ok = ((new > 0) ? PS_SUCCESS : PS_NOMAIL); goto cleanUp; } else if (count > 0) { flag force_retrieval; /* * What forces this code is that in POP2 and * IMAP2bis you can't fetch a message without * having it marked `seen'. In POP3 and IMAP4, on the * other hand, you can (peek_capable is set by * each driver module to convey this; it's not a * method constant because of the difference between * IMAP2bis and IMAP4). * * The result of being unable to peek is that if there's * any kind of transient error (DNS lookup failure, or * sendmail refusing delivery due to process-table limits) * the message will be marked "seen" on the server without * having been delivered. This is not a big problem if * fetchmail is running in foreground, because the user * will see a "skipped" message when it next runs and get * clued in. * * But in daemon mode this leads to the message * being silently ignored forever. This is not * acceptable. * * We compensate for this by checking the error * count from the previous pass and forcing all * messages to be considered new if it's nonzero. */ force_retrieval = !peek_capable && (ctl->errcount > 0); /* read, forward, and delete messages */ for (num = 1; num <= count; num++) { flag toolarge = NUM_NONZERO(ctl->limit) && msgsizes && (msgsizes[num-1] > ctl->limit); flag oldmsg = (protocol->is_old && (protocol->is_old)(sock,ctl,num)); flag fetch_it = !toolarge && (ctl->fetchall || force_retrieval || !oldmsg); flag suppress_delete = FALSE; flag suppress_forward = FALSE; flag suppress_readbody = FALSE; flag retained = FALSE; /* * This check copes with Post Office/NT's * annoying habit of randomly prepending bogus * LIST items of length -1. Patrick Audley * tells us: LIST shows a * size of -1, RETR and TOP return "-ERR * System error - couldn't open message", and * DELE succeeds but doesn't actually delete * the message. */ if (msgsizes && msgsizes[num-1] == -1) { if (outlevel >= O_VERBOSE) error(0, 0, "Skipping message %d, length -1", num - 1); continue; } /* we may want to reject this message if it's old */ if (!fetch_it) { if (outlevel > O_SILENT) { error_build("skipping message %d", num); if (toolarge && !check_only) { char size[32]; int cnt, bytesz = msgsizes[num-1]; #ifdef POP3_ENABLE /* convert sz to string */ sprintf(size, "%d", msgsizes[num-1]); /* build a list of skipped messages * val.id = size of msg (string cnvt) * val.status.num = warning_poll_count * val.status.mask = nbr of msg this size */ current = ctl->skipped; /* initialise warning_poll_count to the * current value so that all new msg will * be included in the next mail */ cnt = current? current->val.status.num : 0; /* if entry exists, increment the count */ if (current && str_in_list(¤t, size, FALSE)) { for ( ; current; current = current->next) { if (strcmp(current->id, size) == 0) { current->val.status.mark++; break; } } } /* otherwise, create a new entry */ /* initialise with current poll count */ else { tmp = save_str(&ctl->skipped, size, 1); tmp->val.status.num = cnt; } #endif /* POP3_ENABLE */ error_build(" (oversized, %d octets)", msgsizes[num-1]); } } } else { flag wholesize = !protocol->fetch_body; /* request a message */ ok = (protocol->fetch_headers)(sock,ctl,num, &len); if (ok != 0) goto cleanUp; /* -1 means we didn't see a size in the response */ if (len == -1 && msgsizes) { len = msgsizes[num - 1]; wholesize = TRUE; } if (outlevel > O_SILENT) { error_build("reading message %d of %d", num,count); if (len > 0) error_build(" (%d %soctets)", len, wholesize ? "" : "header "); if (outlevel >= O_VERBOSE) error_complete(0, 0, ""); else error_build(" "); } /* * Read the message headers and ship them to the * output sink. */ ok = readheaders(sock, len, msgsizes[num-1], ctl, num); if (ok == PS_RETAINED) suppress_forward = retained = TRUE; else if (ok == PS_TRANSIENT) suppress_delete = suppress_forward = TRUE; else if (ok == PS_REFUSED) suppress_forward = TRUE; else if (ok == PS_TRUNCATED) suppress_readbody = TRUE; else if (ok) goto cleanUp; /* * If we're using IMAP4 or something else that * can fetch headers separately from bodies, * it's time to request the body now. This * fetch may be skipped if we got an anti-spam * or other PS_REFUSED error response during * read_headers. */ if (protocol->fetch_body && !suppress_readbody) { if (outlevel >= O_VERBOSE) fputc('\n', stderr); if ((ok = (protocol->trail)(sock, ctl, num))) goto cleanUp; len = 0; if (!suppress_forward) { if ((ok=(protocol->fetch_body)(sock,ctl,num,&len))) goto cleanUp; if (outlevel > O_SILENT && !wholesize) error_build(" (%d body octets) ", len); } } /* process the body now */ if (len > 0) { if (suppress_readbody) { /* When readheaders returns PS_TRUNCATED, the body (which has no content has already been read by readheaders, so we say readbody returned PS_SUCCESS */ ok = PS_SUCCESS; } else { ok = readbody(sock, ctl, !suppress_forward, len); } if (ok == PS_TRANSIENT) suppress_delete = suppress_forward = TRUE; else if (ok) goto cleanUp; /* tell server we got it OK and resynchronize */ if (protocol->trail) { if (outlevel >= O_VERBOSE) fputc('\n', stderr); ok = (protocol->trail)(sock, ctl, num); if (ok != 0) goto cleanUp; } } /* count # messages forwarded on this pass */ if (!suppress_forward) dispatches++; /* * Check to see if the numbers matched? * * Yes, some servers foo this up horribly. * All IMAP servers seem to get it right, and * so does Eudora QPOP at least in 2.xx * versions. * * Microsoft Exchange gets it completely * wrong, reporting compressed rather than * actual sizes (so the actual length of * message is longer than the reported size). * Another fine example of Microsoft brain death! * * Some older POP servers, like the old UCB * POP server and the pre-QPOP QUALCOMM * versions, report a longer size in the LIST * response than actually gets shipped up. * It's unclear what is going on here, as the * QUALCOMM server (at least) seems to be * reporting the on-disk size correctly. */ if (msgsizes && msglen != msgsizes[num-1]) { if (outlevel >= O_VERBOSE) error(0, 0, "message %d was not the expected length (%d actual != %d expected)", num, msglen, msgsizes[num-1]); } /* end-of-message processing starts here */ if (!close_sink(ctl, !suppress_forward)) { ctl->errcount++; suppress_delete = TRUE; } fetches++; } /* * At this point in flow of control, either * we've bombed on a protocol error or had * delivery refused by the SMTP server * (unlikely -- I've never seen it) or we've * seen `accepted for delivery' and the * message is shipped. It's safe to mark the * message seen and delete it on the server * now. */ /* tell the UID code we've seen this */ if (ctl->newsaved) { struct idlist *sdp; for (sdp = ctl->newsaved; sdp; sdp = sdp->next) if (sdp->val.status.num == num) sdp->val.status.mark = UID_SEEN; } /* maybe we delete this message now? */ if (retained) { if (outlevel > O_SILENT) error_complete(0, 0, " retained"); } else if (protocol->delete && !suppress_delete && (fetch_it ? !ctl->keep : ctl->flush)) { deletions++; if (outlevel > O_SILENT) error_complete(0, 0, " flushed"); ok = (protocol->delete)(sock, ctl, num); if (ok != 0) goto cleanUp; #ifdef POP3_ENABLE delete_str(&ctl->newsaved, num); #endif /* POP3_ENABLE */ } else if (outlevel > O_SILENT) error_complete(0, 0, " not flushed"); /* perhaps this as many as we're ready to handle */ if (NUM_NONZERO(ctl->fetchlimit) && ctl->fetchlimit <= fetches) goto no_error; } if (!check_only && ctl->skipped) { clean_skipped_list(&ctl->skipped); send_warning(ctl); } } } while /* * Only re-poll if we had some actual forwards, allowed * deletions and had no errors. * Otherwise it is far too easy to get into infinite loops. */ (dispatches && protocol->retry && !ctl->keep && !ctl->errcount); } no_error: ok = (protocol->logout_cmd)(sock, ctl); /* * Hmmmm...arguably this would be incorrect if we had fetches but * no dispatches (due to oversized messages, etc.) */ if (ok == 0) ok = (fetches > 0) ? PS_SUCCESS : PS_NOMAIL; SockClose(sock); goto closeUp; cleanUp: if (ok != 0 && ok != PS_SOCKET) (protocol->logout_cmd)(sock, ctl); SockClose(sock); } msg = (char *)NULL; /* sacrifice to -Wall */ switch (ok) { case PS_SOCKET: msg = "socket"; break; case PS_AUTHFAIL: msg = "authorization"; break; case PS_SYNTAX: msg = "missing or bad RFC822 header"; break; case PS_IOERR: msg = "MDA"; break; case PS_ERROR: msg = "client/server synchronization"; break; case PS_PROTOCOL: msg = "client/server protocol"; break; case PS_LOCKBUSY: msg = "lock busy on server"; break; case PS_SMTP: msg = "SMTP transaction"; break; case PS_DNS: msg = "DNS lookup"; break; case PS_UNDEFINED: error(0, 0, "undefined"); break; } if (ok==PS_SOCKET || ok==PS_AUTHFAIL || ok==PS_SYNTAX || ok==PS_IOERR || ok==PS_ERROR || ok==PS_PROTOCOL || ok==PS_LOCKBUSY || ok==PS_SMTP) error(0,-1, "%s error while fetching from %s", msg, ctl->server.pollname); closeUp: /* execute post-initialization command, if any */ if (ctl->postconnect && (ok = system(ctl->postconnect))) { char buf[80]; sprintf(buf, "post-connection command failed with status %d", ok); error(0, 0, buf); if (ok == PS_SUCCESS) ok = PS_SYNTAX; } signal(SIGALRM, sigsave); return(ok); } #if defined(HAVE_STDARG_H) void gen_send(int sock, const char *fmt, ... ) /* assemble command in printf(3) style and send to the server */ #else void gen_send(sock, fmt, va_alist) /* assemble command in printf(3) style and send to the server */ int sock; /* socket to which server is connected */ const char *fmt; /* printf-style format */ va_dcl #endif { char buf [MSGBUFSIZE+1]; va_list ap; if (protocol->tagged) (void) sprintf(buf, "%s ", GENSYM); else buf[0] = '\0'; #if defined(HAVE_STDARG_H) va_start(ap, fmt) ; #else va_start(ap); #endif #ifdef HAVE_VSNPRINTF vsnprintf(buf + strlen(buf), sizeof(buf), fmt, ap); #else vsprintf(buf + strlen(buf), fmt, ap); #endif va_end(ap); strcat(buf, "\r\n"); SockWrite(sock, buf, strlen(buf)); if (outlevel >= O_VERBOSE) { char *cp; if (shroud && shroud[0] && (cp = strstr(buf, shroud))) { char *sp; sp = cp + strlen(shroud); *cp++ = '*'; while (*sp) *cp++ = *sp++; *cp = '\0'; } buf[strlen(buf)-2] = '\0'; error(0, 0, "%s> %s", protocol->name, buf); } } int gen_recv(sock, buf, size) /* get one line of input from the server */ int sock; /* socket to which server is connected */ char *buf; /* buffer to receive input */ int size; /* length of buffer */ { int oldphase = phase; /* we don't have to be re-entrant */ phase = SERVER_WAIT; set_timeout(mytimeout); if (SockRead(sock, buf, size) == -1) { set_timeout(0); phase = oldphase; return(PS_SOCKET); } else { set_timeout(0); if (buf[strlen(buf)-1] == '\n') buf[strlen(buf)-1] = '\0'; if (buf[strlen(buf)-1] == '\r') buf[strlen(buf)-1] = '\0'; if (outlevel >= O_VERBOSE) error(0, 0, "%s< %s", protocol->name, buf); phase = oldphase; return(PS_SUCCESS); } } #if defined(HAVE_STDARG_H) int gen_transact(int sock, char *fmt, ... ) /* assemble command in printf(3) style, send to server, accept a response */ #else int gen_transact(int sock, fmt, va_alist) /* assemble command in printf(3) style, send to server, accept a response */ int sock; /* socket to which server is connected */ const char *fmt; /* printf-style format */ va_dcl #endif { int ok; char buf [MSGBUFSIZE+1]; va_list ap; int oldphase = phase; /* we don't have to be re-entrant */ phase = SERVER_WAIT; if (protocol->tagged) (void) sprintf(buf, "%s ", GENSYM); else buf[0] = '\0'; #if defined(HAVE_STDARG_H) va_start(ap, fmt) ; #else va_start(ap); #endif #ifdef HAVE_VSNPRINTF vsnprintf(buf + strlen(buf), sizeof(buf), fmt, ap); #else vsprintf(buf + strlen(buf), fmt, ap); #endif va_end(ap); strcat(buf, "\r\n"); SockWrite(sock, buf, strlen(buf)); if (outlevel >= O_VERBOSE) { char *cp; if (shroud && shroud[0] && (cp = strstr(buf, shroud))) { char *sp; sp = cp + strlen(shroud); *cp++ = '*'; while (*sp) *cp++ = *sp++; *cp = '\0'; } buf[strlen(buf)-1] = '\0'; error(0, 0, "%s> %s", protocol->name, buf); } /* we presume this does its own response echoing */ ok = (protocol->parse_response)(sock, buf); phase = oldphase; return(ok); } /* driver.c ends here */