*
* Copyright 1998 by Eric S. Raymond
* For license terms, see the file COPYING in this directory.
- *
- * i18n by Arnaldo Carvalho de Melo <acme@conectiva.com.br> 7-Nov-1998
*/
#include "config.h"
#include <stdio.h>
#include <errno.h>
#include <string.h>
-#include <signal.h>
-#ifdef HAVE_MEMORY_H
-#include <memory.h>
-#endif /* HAVE_MEMORY_H */
#if defined(STDC_HEADERS)
#include <stdlib.h>
#endif
#include "smtp.h"
#include "i18n.h"
-/* BSD portability hack...I know, this is an ugly place to put it */
-#if !defined(SIGCHLD) && defined(SIGCLD)
-#define SIGCHLD SIGCLD
-#endif
+/* makes the open_sink()/close_sink() pair non-reentrant */
+static int lmtp_responses;
-static int smtp_open(struct query *ctl)
+int smtp_open(struct query *ctl)
/* try to open a socket to the appropriate SMTP server for this query */
{
/* maybe it's time to close the socket in order to force delivery */
- if (NUM_NONZERO(ctl->batchlimit) && (ctl->smtp_socket != -1) && batchcount++ == ctl->batchlimit)
+ if (NUM_NONZERO(ctl->batchlimit) && (ctl->smtp_socket != -1) && ++batchcount == ctl->batchlimit)
{
- close(ctl->smtp_socket);
+ SockClose(ctl->smtp_socket);
ctl->smtp_socket = -1;
batchcount = 0;
}
* HELO name fails (RFC1123 section 5.2.5, paragraph 2).
*
* How we compute the true mailhost name to pass to the
- * listener doesn't affect behavior on RFC1123- violating
+ * listener doesn't affect behavior on RFC1123-violating
* listeners that check for name match; we're going to lose
* on those anyway because we can never give them a name
* that matches the local machine fetchmail is running on.
for (idp = ctl->smtphunt; idp; idp = idp->next)
{
char *cp, *parsed_host;
-#ifdef INET6
+#ifdef INET6_ENABLE
char *portnum = SMTP_PORT;
#else
int portnum = SMTP_PORT;
-#endif /* INET6 */
+#endif /* INET6_ENABLE */
xalloca(parsed_host, char *, strlen(idp->id) + 1);
ctl->smtphost = idp->id; /* remember last host tried. */
+ if(ctl->smtphost[0]=='/')
+ ctl->listener = LMTP_MODE;
strcpy(parsed_host, idp->id);
if ((cp = strrchr(parsed_host, '/')))
{
*cp++ = 0;
-#ifdef INET6
+#ifdef INET6_ENABLE
portnum = cp;
#else
portnum = atoi(cp);
-#endif /* INET6 */
+#endif /* INET6_ENABLE */
}
+ if (ctl->smtphost[0]=='/'){
+ if((ctl->smtp_socket = UnixOpen(ctl->smtphost))==-1)
+ continue;
+ } else
if ((ctl->smtp_socket = SockOpen(parsed_host,portnum,NULL,
ctl->server.plugout)) == -1)
continue;
* enforce this. Now that we have the actual hostname,
* compute what we should canonicalize with.
*/
- ctl->destaddr = ctl->smtpaddress ? ctl->smtpaddress : ( ctl->smtphost ? ctl->smtphost : "localhost");
+ ctl->destaddr = ctl->smtpaddress ? ctl->smtpaddress : ( ctl->smtphost && ctl->smtphost[0] != '/' ? ctl->smtphost : "localhost");
if (outlevel >= O_DEBUG && ctl->smtp_socket != -1)
- error(0, 0, _("forwarding to %s"), ctl->smtphost);
+ report(stdout, _("forwarding to %s\n"), ctl->smtphost);
return(ctl->smtp_socket);
}
/* these are shared by open_sink and stuffline */
static FILE *sinkfp;
-static RETSIGTYPE (*sigchld)(int);
int stuffline(struct query *ctl, char *buf)
/* ship a line to the given control block's output sink (SMTP server or MDA) */
* decorated any . lines it sends back up.
*/
if (*buf == '.')
+ {
if (ctl->server.base_protocol->delimited) /* server has already byte-stuffed */
{
if (ctl->mda)
else
/* leave it alone */;
}
+ }
/* we may need to strip carriage returns */
if (ctl->stripcr)
*cp = '_';
}
-static int send_bouncemail(struct query *ctl, struct msgblk *msgcopy,
- int nerrors, char *errors[])
+static int send_bouncemail(struct query *ctl, struct msgblk *msg,
+ int userclass, char *message,
+ int nerrors, char *errors[])
+/* bounce back an error report a la RFC 1892 */
{
- char buf[MSGBUFSIZE];
- int i;
+ char daemon_name[18 + HOSTLEN] = "FETCHMAIL-DAEMON@";
+ char boundary[BUFSIZ], *bounce_to;
+ int sock;
- if (open_warning_by_mail(ctl, msgcopy))
+ /* don't bounce in reply to undeliverable bounces */
+ if (!msg->return_path[0] || strcmp(msg->return_path, "<>") == 0)
return(FALSE);
- /* generate an error report a la RFC 1892 */
- stuff_warning(ctl, "MIME-Version: 1.0");
- stuff_warning(ctl, "Content-Type: multipart/report report-type=text/plain boundary=\"om-mani-padme-hum\"");
- stuff_warning(ctl, "Content-Transfer-Encoding: 7bit");
- stuff_warning(ctl, "");
+ bounce_to = (run.bouncemail ? msg->return_path : run.postmaster);
+
+ SMTP_setmode(SMTP_MODE);
+ strcat(daemon_name, fetchmailhost);
+
+ /* we need only SMTP for this purpose */
+ if ((sock = SockOpen("localhost", SMTP_PORT, NULL, NULL)) == -1
+ || SMTP_ok(sock) != SM_OK
+ || SMTP_helo(sock, "localhost") != SM_OK
+ || SMTP_from(sock, daemon_name, (char *)NULL) != SM_OK
+ || SMTP_rcpt(sock, bounce_to) != SM_OK
+ || SMTP_data(sock) != SM_OK)
+ return(FALSE);
+
+ /* our first duty is to keep the sacred foo counters turning... */
+#ifdef HAVE_SNPRINTF
+ snprintf(boundary, sizeof(boundary),
+#else
+ sprintf(boundary,
+#endif /* HAVE_SNPRINTF */
+ "foo-mani-padme-hum-%d-%d-%ld",
+ (int)getpid(), (int)getppid(), time((time_t *)NULL));
+
+ if (outlevel >= O_VERBOSE)
+ report(stdout, _("SMTP: (bounce-message body)\n"));
+ else
+ /* this will usually go to sylog... */
+ report(stderr, _("mail from %s bounced to %s\n"),
+ daemon_name, bounce_to);
+
+ /* bouncemail headers */
+ SockPrintf(sock, "Return-Path: <>\r\n");
+ SockPrintf(sock, "From: %s\r\n", daemon_name);
+ SockPrintf(sock, "To: %s\r\n", bounce_to);
+ SockPrintf(sock, "MIME-Version: 1.0\r\n");
+ SockPrintf(sock, "Content-Type: multipart/report; report-type=delivery-status;\r\n\tboundary=\"%s\"\r\n", boundary);
+ SockPrintf(sock, "\r\n");
/* RFC1892 part 1 -- human-readable message */
- stuff_warning(ctl, "-- om-mani-padme-hum");
- stuff_warning(ctl, "");
+ SockPrintf(sock, "--%s\r\n", boundary);
+ SockPrintf(sock,"Content-Type: text/plain\r\n");
+ SockPrintf(sock, "\r\n");
+ SockWrite(sock, message, strlen(message));
+ SockPrintf(sock, "\r\n");
+ SockPrintf(sock, "\r\n");
+
+ if (nerrors)
+ {
+ struct idlist *idp;
+ int nusers;
+
+ /* RFC1892 part 2 -- machine-readable responses */
+ SockPrintf(sock, "--%s\r\n", boundary);
+ SockPrintf(sock,"Content-Type: message/delivery-status\r\n");
+ SockPrintf(sock, "\r\n");
+ SockPrintf(sock, "Reporting-MTA: dns; %s\r\n", fetchmailhost);
- /* RFC1892 part 2 -- machine-readable responses */
- stuff_warning(ctl, "-- om-mani-padme-hum");
- stuff_warning(ctl,"Content-Type: message/delivery-status");
- stuff_warning(ctl, "");
- for (i = 0; i < nerrors; i++)
- stuff_warning(ctl, errors[i]);
+ nusers = 0;
+ for (idp = msg->recipients; idp; idp = idp->next)
+ if (idp->val.status.mark == userclass)
+ {
+ char *error;
+ /* Minimum RFC1894 compliance + Diagnostic-Code field */
+ SockPrintf(sock, "\r\n");
+ SockPrintf(sock, "Final-Recipient: rfc822; %s\r\n", idp->id);
+ SockPrintf(sock, "Last-Attempt-Date: %s\r\n", rfc822timestamp());
+ SockPrintf(sock, "Action: failed\r\n");
+
+ if (nerrors == 1)
+ /* one error applies to all users */
+ error = errors[0];
+ else if (nerrors > nusers)
+ {
+ SockPrintf(sock, "Internal error: SMTP error count doesn't match number of recipients.\r\n");
+ break;
+ }
+ else
+ /* errors correspond 1-1 to selected users */
+ error = errors[nusers++];
+
+ if (strlen(error) > 9 && isdigit(error[4])
+ && error[5] == '.' && isdigit(error[6])
+ && error[7] == '.' && isdigit(error[8]))
+ /* Enhanced status code available, use it */
+ SockPrintf(sock, "Status: %5.5s\r\n", &(error[4]));
+ else
+ /* Enhanced status code not available, fake one */
+ SockPrintf(sock, "Status: %c.0.0\r\n", error[0]);
+ SockPrintf(sock, "Diagnostic-Code: %s\r\n", error);
+ }
+ SockPrintf(sock, "\r\n");
+ }
/* RFC1892 part 3 -- headers of undelivered message */
- stuff_warning(ctl, "-- om-mani-padme-hum");
- stuff_warning(ctl, "Content-Type: text/rfc822-headers");
- stuff_warning(ctl, "");
- stuffline(ctl, msgcopy->headers);
-
- stuff_warning(ctl, "-- om-mani-padme-hum --");
+ SockPrintf(sock, "--%s\r\n", boundary);
+ SockPrintf(sock, "Content-Type: text/rfc822-headers\r\n");
+ SockPrintf(sock, "\r\n");
+ SockWrite(sock, msg->headers, strlen(msg->headers));
+ SockPrintf(sock, "\r\n");
+ SockPrintf(sock, "--%s--\r\n", boundary);
+
+ if (SMTP_eom(sock) != SM_OK || SMTP_quit(sock))
+ return(FALSE);
- close_warning_by_mail(ctl, msgcopy);
+ SockClose(sock);
return(TRUE);
}
+static int handle_smtp_report(struct query *ctl, struct msgblk *msg)
+/* handle SMTP errors based on the content of SMTP_response */
+/* return of PS_REFUSED deletes mail from the server; PS_TRANSIENT keeps it */
+{
+ int smtperr = atoi(smtp_response);
+ char *responses[1];
+
+ xalloca(responses[0], char *, strlen(smtp_response)+1);
+ strcpy(responses[0], smtp_response);
+
+ SMTP_rset(ctl->smtp_socket); /* stay on the safe side */
+
+ if (outlevel >= O_DEBUG)
+ report(stdout, _("Saved error is still %d\n"), smtperr);
+
+ /*
+ * Note: send_bouncemail message strings are not made subject
+ * to gettext translation because (a) they're going to be
+ * embedded in a text/plain 7bit part, and (b) they're
+ * going to be associated with listener error-response
+ * messages, which are probably in English (none of the
+ * MTAs I know about are internationalized).
+ */
+ if (str_find(&ctl->antispam, smtperr))
+ {
+ /*
+ * SMTP listener explicitly refuses to deliver mail
+ * coming from this address, probably due to an
+ * anti-spam domain exclusion. Respect this. Don't
+ * try to ship the message, and don't prevent it from
+ * being deleted. There's no point in bouncing the
+ * email either since most spammers don't put their
+ * real return email address anywhere in the headers
+ * (unless the user insists with the SET SPAMBOUNCE
+ * config option).
+ *
+ * Default values:
+ *
+ * 571 = sendmail's "unsolicited email refused"
+ * 550 = exim's new antispam response (temporary)
+ * 501 = exim's old antispam response
+ * 554 = Postfix antispam response.
+ *
+ */
+ if (run.spambounce)
+ send_bouncemail(ctl, msg, XMIT_ACCEPT,
+ "Our spam filter rejected this transaction.\r\n",
+ 1, responses);
+ return(PS_REFUSED);
+ }
+
+ /*
+ * Suppress error message only if the response specifically
+ * meant `excluded for policy reasons'. We *should* see
+ * an error when the return code is less specific.
+ */
+ if (smtperr >= 400)
+ report(stderr, _("%cMTP error: %s\n"),
+ ctl->listener,
+ responses[0]);
+
+ switch (smtperr)
+ {
+ case 552: /* message exceeds fixed maximum message size */
+ /*
+ * Permanent no-go condition on the
+ * ESMTP server. Don't try to ship the message,
+ * and allow it to be deleted.
+ */
+ send_bouncemail(ctl, msg, XMIT_ACCEPT,
+ "This message was too large (SMTP error 552).\r\n",
+ 1, responses);
+ return(run.bouncemail ? PS_REFUSED : PS_TRANSIENT);
+
+ case 553: /* invalid sending domain */
+ /*
+ * These latter days 553 usually means a spammer is trying to
+ * cover his tracks. We never bouncemail on these, because
+ * (a) the return address is invalid by definition, and
+ * (b) we wouldn't want spammers to get confirmation that
+ * this address is live, anyway.
+ */
+ send_bouncemail(ctl, msg, XMIT_ACCEPT,
+ "Invalid address in MAIL FROM (SMTP error 553).\r\n",
+ 1, responses);
+ return(PS_REFUSED);
+
+ default:
+ /* bounce non-transient errors back to the sender */
+ if (smtperr >= 500 && smtperr <= 599)
+ if (send_bouncemail(ctl, msg, XMIT_ACCEPT,
+ "General SMTP/ESMTP error.\r\n",
+ 1, responses))
+ return(run.bouncemail ? PS_REFUSED : PS_TRANSIENT);
+ /*
+ * We're going to end up here on 4xx errors, like:
+ *
+ * 451: temporarily unable to identify sender (exim)
+ * 452: temporary out-of-queue-space condition on the ESMTP server.
+ *
+ * These are temporary errors. Don't try to ship the message,
+ * and suppress deletion so it can be retried on a future
+ * retrieval cycle.
+ *
+ * Bouncemail *might* be appropriate here as a delay
+ * notification (note; if we ever add this, we must make
+ * sure the RFC1894 Action field is "delayed" rather thwn
+ * "failed"). But it's not really necessary because
+ * these are not actual failures, we're very likely to be
+ * able to recover on the next cycle.
+ */
+ return(PS_TRANSIENT);
+ }
+}
+
int open_sink(struct query *ctl, struct msgblk *msg,
int *good_addresses, int *bad_addresses)
/* set up sinkfp to be an input sink we can ship a message to */
else if (ctl->mimemsg & MSG_IS_7BIT)
fputs(" BODY=7BIT", sinkfp);
- fprintf(sinkfp, " SIZE=%ld\r\n", msg->reallen);
+ /* exim's BSMTP processor does not handle SIZE */
+ /* fprintf(sinkfp, " SIZE=%d", msg->reallen); */
+
+ fprintf(sinkfp, "\r\n");
/*
* RFC 1123 requires that the domain name part of the
for (idp = msg->recipients; idp; idp = idp->next)
if (idp->val.status.mark == XMIT_ACCEPT)
{
- if (strchr(idp->id, '@'))
- fprintf(sinkfp,
- "RCPT TO: %s\r\n", idp->id);
+ if (ctl->smtpname)
+ fprintf(sinkfp, "RCPT TO: %s\r\n", ctl->smtpname);
+ else if (strchr(idp->id, '@'))
+ fprintf(sinkfp,
+ "RCPT TO: %s\r\n", idp->id);
else
fprintf(sinkfp,
- "RCPT TO: %s@%s\r\n", idp->id, ctl->destaddr);
+ "RCPT TO: %s@%s\r\n", idp->id, ctl->destaddr);
*good_addresses = 0;
}
if (ferror(sinkfp))
{
- error(0, -1, _("BSMTP file open or preamble write failed"));
+ report(stderr, _("BSMTP file open or preamble write failed\n"));
return(PS_BSMTP);
}
}
- else if (ctl->mda) /* we have a declared MDA */
+
+ /*
+ * Try to forward to an SMTP or LMTP listener. If the attempt to
+ * open a socket fails, fall through to attempt delivery via
+ * local MDA.
+ */
+ else if (!ctl->mda && smtp_open(ctl) != -1)
+ {
+ const char *ap;
+ char options[MSGBUFSIZE];
+ char addr[HOSTLEN+USERNAMELEN+1];
+ char **from_responses;
+ int total_addresses;
+
+ /*
+ * Compute ESMTP options.
+ */
+ options[0] = '\0';
+ if (ctl->server.esmtp_options & ESMTP_8BITMIME) {
+ if (ctl->pass8bits || (ctl->mimemsg & MSG_IS_8BIT))
+ strcpy(options, " BODY=8BITMIME");
+ else if (ctl->mimemsg & MSG_IS_7BIT)
+ strcpy(options, " BODY=7BIT");
+ }
+
+ if ((ctl->server.esmtp_options & ESMTP_SIZE) && msg->reallen > 0)
+ sprintf(options + strlen(options), " SIZE=%d", msg->reallen);
+
+ /*
+ * Try to get the SMTP listener to take the Return-Path
+ * address as MAIL FROM. If it won't, fall back on the
+ * remotename and mailserver host. This won't affect replies,
+ * which use the header From address anyway; the MAIL FROM
+ * address is a place for the SMTP listener to send
+ * bouncemail. The point is to guarantee a FQDN in the MAIL
+ * FROM line -- some SMTP listeners, like smail, become
+ * unhappy otherwise.
+ *
+ * RFC 1123 requires that the domain name part of the
+ * MAIL FROM address be "canonicalized", that is a
+ * FQDN or MX but not a CNAME. We'll assume the Return-Path
+ * header is already in this form here (it certainly
+ * is if rewrite is on). RFC 1123 is silent on whether
+ * a nonexistent hostname part is considered canonical.
+ *
+ * This is a potential problem if the MTAs further upstream
+ * didn't pass canonicalized From/Return-Path lines, *and* the
+ * local SMTP listener insists on them.
+ */
+ if (!msg->return_path[0])
+ {
+#ifdef HAVE_SNPRINTF
+ snprintf(addr, sizeof(addr),
+#else
+ sprintf(addr,
+#endif /* HAVE_SNPRINTF */
+ "%s@%s", ctl->remotename, ctl->server.truename);
+ ap = addr;
+ }
+ else if (strchr(msg->return_path, '@'))
+ ap = msg->return_path;
+ else /* in case Return-Path existed but was local */
+ {
+#ifdef HAVE_SNPRINTF
+ snprintf(addr, sizeof(addr),
+#else
+ sprintf(addr,
+#endif /* HAVE_SNPRINTF */
+ "%s@%s", msg->return_path, ctl->server.truename);
+ ap = addr;
+ }
+
+ if (SMTP_from(ctl->smtp_socket, ap, options) != SM_OK)
+ return(handle_smtp_report(ctl, msg));
+
+ /*
+ * Now list the recipient addressees
+ */
+ total_addresses = 0;
+ for (idp = msg->recipients; idp; idp = idp->next)
+ total_addresses++;
+ xalloca(from_responses, char **, sizeof(char *) * total_addresses);
+ for (idp = msg->recipients; idp; idp = idp->next)
+ if (idp->val.status.mark == XMIT_ACCEPT)
+ {
+ if (strchr(idp->id, '@'))
+ strcpy(addr, idp->id);
+ else {
+ if (ctl->smtpname) {
+#ifdef HAVE_SNPRINTF
+ snprintf(addr, sizeof(addr)-1, "%s", ctl->smtpname);
+#else
+ sprintf(addr, "%s", ctl->smtpname);
+#endif /* HAVE_SNPRINTF */
+
+ } else {
+#ifdef HAVE_SNPRINTF
+ snprintf(addr, sizeof(addr)-1, "%s@%s", idp->id, ctl->destaddr);
+#else
+ sprintf(addr, "%s@%s", idp->id, ctl->destaddr);
+#endif /* HAVE_SNPRINTF */
+ }
+ }
+ if (SMTP_rcpt(ctl->smtp_socket, addr) == SM_OK)
+ (*good_addresses)++;
+ else
+ {
+ char errbuf[POPBUFSIZE];
+
+#ifdef __UNUSED__
+ /*
+ * I don't remember how this got in here, but it doesn't
+ * work. The obvious symptom is that no bounce message
+ * is sent for a nonexistent user. Less obviously
+ * Forwarding to postmaster also does not work. The body is
+ * discarded.
+ *
+ * If a mail is sent to one valid and one invalid
+ * user, the mail does not go to the valid user
+ * also as the body is discarded after calling
+ * RSET!
+ */
+ int res;
+ if ((res = handle_smtp_report(ctl, msg))==PS_REFUSED)
+ return(PS_REFUSED);
+#endif /* __UNUSED__ */
+
+#ifdef HAVE_SNPRINTF
+ snprintf(errbuf, sizeof(errbuf), "%s: %s",
+ idp->id, smtp_response);
+#else
+ strncpy(errbuf, idp->id, sizeof(errbuf));
+ strcat(errbuf, ": ");
+ strcat(errbuf, smtp_response);
+#endif /* HAVE_SNPRINTF */
+
+ xalloca(from_responses[*bad_addresses],
+ char *,
+ strlen(errbuf)+1);
+ strcpy(from_responses[*bad_addresses], errbuf);
+
+ (*bad_addresses)++;
+ idp->val.status.mark = XMIT_RCPTBAD;
+ if (outlevel >= O_VERBOSE)
+ report(stderr,
+ _("%cMTP listener doesn't like recipient address `%s'\n"),
+ ctl->listener, addr);
+ }
+ }
+ if (*bad_addresses)
+ send_bouncemail(ctl, msg, XMIT_RCPTBAD,
+ "Some addresses were rejected by the MDA fetchmail forwards to.\r\n",
+ *bad_addresses, from_responses);
+ /*
+ * It's tempting to do local notification only if bouncemail was
+ * insufficient -- that is, to add && total_addresses > *bad_addresses
+ * to the test here. The problem with this theory is that it would
+ * make initial diagnosis of a broken multidrop configuration very
+ * hard -- most single-recipient messages would just invisibly bounce.
+ */
+ if (!(*good_addresses))
+ {
+ if (strchr(run.postmaster, '@'))
+ strncpy(addr, run.postmaster, sizeof(addr));
+ else
+ {
+#ifdef HAVE_SNPRINTF
+ snprintf(addr, sizeof(addr)-1, "%s@%s", run.postmaster, ctl->destaddr);
+#else
+ sprintf(addr, "%s@%s", run.postmaster, ctl->destaddr);
+#endif /* HAVE_SNPRINTF */
+ }
+
+ if (SMTP_rcpt(ctl->smtp_socket, addr) != SM_OK)
+ {
+ report(stderr, _("can't even send to %s!\n"), run.postmaster);
+ SMTP_rset(ctl->smtp_socket); /* required by RFC1870 */
+ return(PS_SMTP);
+ }
+
+ if (outlevel >= O_VERBOSE)
+ report(stderr, _("no address matches; forwarding to %s.\n"), run.postmaster);
+ }
+
+ /*
+ * Tell the listener we're ready to send data.
+ * Some listeners (like zmailer) may return antispam errors here.
+ */
+ if (SMTP_data(ctl->smtp_socket) != SM_OK)
+ return(handle_smtp_report(ctl, msg));
+ }
+
+ /*
+ * Awkward case. User didn't specify an MDA. Our attempt to get a
+ * listener socket failed. Try to cope anyway -- initial configuration
+ * may have found procmail.
+ */
+ else if (!ctl->mda)
+ {
+ report(stderr, _("%cMTP connect to %s failed\n"),
+ ctl->listener,
+ ctl->smtphost ? ctl->smtphost : "localhost");
+
+#ifndef FALLBACK_MDA
+ /* No fallback MDA declared. Bail out. */
+ return(PS_SMTP);
+#else
+ /*
+ * If user had things set up to forward offsite, no way
+ * we want to deliver locally!
+ */
+ if (ctl->smtphost && strcmp(ctl->smtphost, "localhost"))
+ return(PS_SMTP);
+
+ /*
+ * User was delivering locally. We have a fallback MDA.
+ * Latch it in place, logging the error, and fall through.
+ */
+ ctl->mda = FALLBACK_MDA;
+
+ report(stderr, _("can't raise the listener; falling back to %s"),
+ FALLBACK_MDA);
+#endif
+ }
+
+ if (ctl->mda) /* must deliver through an MDA */
{
int length = 0, fromlen = 0, nameslen = 0;
char *names = NULL, *before, *after, *from = NULL;
if (outlevel >= O_DEBUG)
- error(0, 0, _("about to deliver with: %s"), before);
+ report(stdout, _("about to deliver with: %s\n"), before);
#ifdef HAVE_SETEUID
/*
if (!sinkfp)
{
- error(0, 0, _("MDA open failed"));
+ report(stderr, _("MDA open failed\n"));
return(PS_IOERR);
}
-
- sigchld = signal(SIGCHLD, SIG_DFL);
- }
- else /* forward to an SMTP or LMTP listener */
- {
- const char *ap;
- char options[MSGBUFSIZE], addr[128];
-
- /* build a connection to the SMTP listener */
- if ((smtp_open(ctl) == -1))
- {
- error(0, errno, _("%cMTP connect to %s failed"),
- ctl->listener,
- ctl->smtphost ? ctl->smtphost : "localhost");
- return(PS_SMTP);
- }
-
- /*
- * Compute ESMTP options.
- */
- options[0] = '\0';
- if (ctl->server.esmtp_options & ESMTP_8BITMIME) {
- if (ctl->pass8bits || (ctl->mimemsg & MSG_IS_8BIT))
- strcpy(options, " BODY=8BITMIME");
- else if (ctl->mimemsg & MSG_IS_7BIT)
- strcpy(options, " BODY=7BIT");
- }
-
- if ((ctl->server.esmtp_options & ESMTP_SIZE) && msg->reallen > 0)
- sprintf(options + strlen(options), " SIZE=%ld", msg->reallen);
-
- /*
- * Try to get the SMTP listener to take the Return-Path
- * address as MAIL FROM . If it won't, fall back on the
- * calling-user ID. This won't affect replies, which use the
- * header From address anyway.
- *
- * RFC 1123 requires that the domain name part of the
- * MAIL FROM address be "canonicalized", that is a
- * FQDN or MX but not a CNAME. We'll assume the From
- * header is already in this form here (it certainly
- * is if rewrite is on). RFC 1123 is silent on whether
- * a nonexistent hostname part is considered canonical.
- *
- * This is a potential problem if the MTAs further upstream
- * didn't pass canonicalized From/Return-Path lines, *and* the
- * local SMTP listener insists on them.
- *
- * None of these error conditions generates bouncemail. Comments
- * below explain for each case why this is so.
- */
- ap = (msg->return_path[0]) ? msg->return_path : user;
- if (SMTP_from(ctl->smtp_socket, ap, options) != SM_OK)
- {
- int smtperr = atoi(smtp_response);
-
- if (str_find(&ctl->antispam, smtperr))
- {
- /*
- * SMTP listener explicitly refuses to deliver mail
- * coming from this address, probably due to an
- * anti-spam domain exclusion. Respect this. Don't
- * try to ship the message, and don't prevent it from
- * being deleted. Typical values:
- *
- * 501 = exim's old antispam response
- * 550 = exim's new antispam response (temporary)
- * 553 = sendmail 8.8.7's generic REJECT
- * 571 = sendmail's "unsolicited email refused"
- *
- * We don't send bouncemail on antispam failures because
- * we don't want the scumbags to know the address is even
- * valid.
- */
- SMTP_rset(ctl->smtp_socket); /* required by RFC1870 */
- return(PS_REFUSED);
- }
-
- /*
- * Suppress error message only if the response specifically
- * meant `excluded for policy reasons'. We *should* see
- * an error when the return code is less specific.
- */
- if (smtperr >= 400)
- error(0, -1, _("%cMTP error: %s"),
- ctl->listener,
- smtp_response);
-
- switch (smtperr)
- {
- case 452: /* insufficient system storage */
- /*
- * Temporary out-of-queue-space condition on the
- * ESMTP server. Don't try to ship the message,
- * and suppress deletion so it can be retried on
- * a future retrieval cycle.
- *
- * Bouncemail *might* be appropriate here as a delay
- * notification. But it's not really necessary because
- * this is not an actual failure, we're very likely to be
- * able to recover on the next cycle.
- */
- SMTP_rset(ctl->smtp_socket); /* required by RFC1870 */
- return(PS_TRANSIENT);
-
- case 552: /* message exceeds fixed maximum message size */
- case 553: /* invalid sending domain */
- /*
- * Permanent no-go condition on the
- * ESMTP server. Don't try to ship the message,
- * and allow it to be deleted.
- *
- * Bouncemail would be appropriate for 552, but in these
- * latter days 553 usually means a spammer is trying to
- * cover his tracks. We'd rather deny the scumbags any
- * feedback that the address is valid.
- */
- SMTP_rset(ctl->smtp_socket); /* required by RFC1870 */
- return(PS_REFUSED);
-
- default: /* retry with postmaster's address */
- if (SMTP_from(ctl->smtp_socket,run.postmaster,options)!=SM_OK)
- {
- error(0, -1, _("%cMTP error: %s"),
- ctl->listener,
- smtp_response);
- return(PS_SMTP); /* should never happen */
- }
- }
- }
-
- /*
- * Now list the recipient addressees
- */
- for (idp = msg->recipients; idp; idp = idp->next)
- if (idp->val.status.mark == XMIT_ACCEPT)
- {
- if (strchr(idp->id, '@'))
- strcpy(addr, idp->id);
- else
-#ifdef HAVE_SNPRINTF
- snprintf(addr, sizeof(addr)-1, "%s@%s", idp->id, ctl->destaddr);
-#else
- sprintf(addr, "%s@%s", idp->id, ctl->destaddr);
-#endif /* HAVE_SNPRINTF */
-
- if (SMTP_rcpt(ctl->smtp_socket, addr) == SM_OK)
- (*good_addresses)++;
- else
- {
- (*bad_addresses)++;
- idp->val.status.mark = XMIT_ANTISPAM;
- error(0, 0,
- _("%cMTP listener doesn't like recipient address `%s'"),
- ctl->listener, addr);
- }
- }
- if (!(*good_addresses))
- {
-#ifdef HAVE_SNPRINTF
- snprintf(addr, sizeof(addr)-1, "%s@%s", run.postmaster, ctl->destaddr);
-#else
- sprintf(addr, "%s@%s", run.postmaster, ctl->destaddr);
-#endif /* HAVE_SNPRINTF */
-
- if (SMTP_rcpt(ctl->smtp_socket, addr) != SM_OK)
- {
- error(0, 0, _("can't even send to %s!"), run.postmaster);
- SMTP_rset(ctl->smtp_socket); /* required by RFC1870 */
- return(PS_SMTP);
- }
- }
-
- /* tell it we're ready to send data */
- SMTP_data(ctl->smtp_socket);
}
/*
* We need to stash this away in order to know how many
* response lines to expect after the LMTP end-of-message.
*/
- msg->lmtp_responses = *good_addresses;
+ lmtp_responses = *good_addresses;
return(PS_SUCCESS);
}
void release_sink(struct query *ctl)
/* release the per-message output sink, whether it's a pipe or SMTP socket */
{
- if (ctl->bsmtp)
+ if (ctl->bsmtp && sinkfp)
fclose(sinkfp);
else if (ctl->mda)
{
pclose(sinkfp);
sinkfp = (FILE *)NULL;
}
- signal(SIGCHLD, sigchld);
}
}
}
else
rc = 0;
- signal(SIGCHLD, sigchld);
if (rc)
{
- error(0, -1, _("MDA exited abnormally or returned nonzero status"));
+ report(stderr,
+ _("MDA exited abnormally or returned nonzero status\n"));
return(FALSE);
}
}
- else if (ctl->bsmtp)
+ else if (ctl->bsmtp && sinkfp)
{
+ int error;
+
/* implicit disk-full check here... */
- fputs("..\r\n", sinkfp);
+ fputs(".\r\n", sinkfp);
+ error = ferror(sinkfp);
if (strcmp(ctl->bsmtp, "-"))
- fclose(sinkfp);
- if (ferror(sinkfp))
+ if (fclose(sinkfp) == EOF) error = 1;
+ if (error)
{
- error(0, -1, _("Message termination or close of BSMTP file failed"));
+ report(stderr,
+ _("Message termination or close of BSMTP file failed\n"));
return(FALSE);
}
}
/* write message terminator */
if (SMTP_eom(ctl->smtp_socket) != SM_OK)
{
- error(0, -1, _("SMTP listener refused delivery"));
- return(FALSE);
+ if (handle_smtp_report(ctl, msg) != PS_REFUSED)
+ return(FALSE);
+ else
+ {
+ report(stderr, _("SMTP listener refused delivery\n"));
+ return(TRUE);
+ }
}
/*
* to people who got it the first time.
*/
if (ctl->listener == LMTP_MODE)
- if (msg->lmtp_responses == 0)
+ {
+ if (lmtp_responses == 0)
{
SMTP_ok(ctl->smtp_socket);
* comply.
*/
if (atoi(smtp_response) == 503)
- error(0, -1, _("LMTP delivery error on EOM"));
+ report(stderr, _("LMTP delivery error on EOM\n"));
else
- error(0, -1,
- _("Unexpected non-503 response to LMTP EOM: %s"),
+ report(stderr,
+ _("Unexpected non-503 response to LMTP EOM: %s\n"),
smtp_response);
/*
char **responses;
/* eat the RFC2033-required responses, saving errors */
- xalloca(responses, char **, sizeof(char *) * msg->lmtp_responses);
- for (errors = i = 0; i < msg->lmtp_responses; i++)
+ xalloca(responses, char **, sizeof(char *) * lmtp_responses);
+ for (errors = i = 0; i < lmtp_responses; i++)
{
if (SMTP_ok(ctl->smtp_socket) == SM_OK)
responses[i] = (char *)NULL;
if (errors == 0)
return(TRUE); /* all deliveries succeeded */
- else if (errors == msg->lmtp_responses)
- return(FALSE); /* all deliveries failed */
else
- {
/*
- * Now life gets messy. There are multiple recipients,
- * and one or more (but not all) deliveries failed.
- *
- * What we'd really like to do is bounce a
- * failures list back to the sender and return
- * TRUE, deleting the message from the server so
- * it won't be re-forwarded on subsequent poll
- * cycles.
- *
- * We can't do that yet, so instead we report
- * failures to the calling-user/postmaster. If we can't,
- * there's a transient error in local delivery; leave
- * the message on the server.
+ * One or more deliveries failed.
+ * If we can bounce a failures list back to the
+ * sender, and the postmaster does not want to
+ * deal with the bounces return TRUE, deleting the
+ * message from the server so it won't be
+ * re-forwarded on subsequent poll cycles.
*/
- send_bouncemail(ctl,
- (struct msgblk *)NULL,
- errors, responses);
-
- /*
- * It's not completely clear what to do here,
- * either. We choose to interpret delivery
- * failure here as a permanent error, so the
- * people who got successful deliveries won't see
- * endless repetitions of the same message on
- * subsequent poll messages. If we're wrong, a
- * transient error will cause someone to lose
- * mail. This could only happen with
- * multi-recipient messages coming from a remote
- * mailserver to two or more local users...
- */
- return(TRUE);
- }
+ return(send_bouncemail(ctl, msg, XMIT_ACCEPT,
+ "LSMTP partial delivery failure.\r\n",
+ errors, responses));
}
+ }
}
return(TRUE);
/*
* Dispatching warning email is a little complicated. The problem is
- * that we have to deal with four distinct cases:
+ * that we have to deal with three distinct cases:
*
- * 1. Non-null msg argument. We're trying to generate bouncemail
- * about the given message. Address using the Return-Path member.
- *
- * 2. Single-drop running from user account. Warning mail should
+ * 1. Single-drop running from user account. Warning mail should
* go to the local name for which we're collecting (coincides
* with calling user).
*
- * 3. Single-drop running from root or other privileged ID, with rc
+ * 2. Single-drop running from root or other privileged ID, with rc
* file generated on the fly (Ken Estes's weird setup...) Mail
* should go to the local name for which we're collecting (does not
* coincide with calling user).
*
- * 4. Multidrop. Mail must go to postmaster. We leave the recipients
+ * 3. Multidrop. Mail must go to postmaster. We leave the recipients
* member null so this message will fall through to run.postmaster.
*
* The zero in the reallen element means we won't pass a SIZE
* option to ESMTP; the message length would be more trouble than
* it's worth to compute.
*/
- struct msgblk reply = {NULL, NULL, "FETCHMAIL-DAEMON", 0};
- int status;
+ struct msgblk reply = {NULL, NULL, "FETCHMAIL-DAEMON@", 0};
- if (msg) /* send bouncemail (not used yet) */
- {
- if (!msg->return_path[0])
- return(PS_REFUSED);
-
- save_str(&reply.recipients, msg->return_path, XMIT_ACCEPT);
- status = open_sink(ctl, &reply, &good, &bad);
- free_str_list(&reply.recipients);
- return(status);
- }
- else if (!MULTIDROP(ctl)) /* send to calling user */
+ strcat(reply.return_path, fetchmailhost);
+
+ if (!MULTIDROP(ctl)) /* send to calling user */
{
+ int status;
+
save_str(&reply.recipients, ctl->localnames->id, XMIT_ACCEPT);
status = open_sink(ctl, &reply, &good, &bad);
free_str_list(&reply.recipients);
#endif
va_end(ap);
+#ifdef HAVE_SNPRINTF
+ snprintf(buf+strlen(buf), sizeof(buf)-strlen(buf), "\r\n");
+#else
strcat(buf, "\r\n");
+#endif /* HAVE_SNPRINTF */
stuffline(ctl, buf);
}
void close_warning_by_mail(struct query *ctl, struct msgblk *msg)
/* sign and send mailed warnings */
{
- stuff_warning(ctl, "--\r\n\t\t\t\tThe Fetchmail Daemon\r\n");
+ stuff_warning(ctl, _("--\r\n\t\t\t\tThe Fetchmail Daemon\r\n"));
close_sink(ctl, msg, TRUE);
}
projects / ~andy / fetchmail / blobdiff