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/* $OpenBSD: bounce.c,v 1.38 2012/01/11 17:28:36 eric Exp $ */
/*
* Copyright (c) 2009 Gilles Chehade <gilles@openbsd.org>
* Copyright (c) 2009 Jacek Masiulaniec <jacekm@dobremiasto.net>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <sys/types.h>
#include <sys/queue.h>
#include <sys/tree.h>
#include <sys/param.h>
#include <sys/socket.h>
#include <err.h>
#include <event.h>
#include <imsg.h>
#include <inttypes.h>
#include <pwd.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <unistd.h>
#include "smtpd.h"
#include "client.h"
#include "log.h"
struct client_ctx {
struct event ev;
struct envelope m;
struct smtp_client *pcb;
FILE *msgfp;
};
int
bounce_session(int fd, struct envelope *m)
{
struct client_ctx *cc = NULL;
int msgfd = -1;
char *reason;
FILE *msgfp = NULL;
u_int32_t msgid;
msgid = evpid_to_msgid(m->id);
/* get message content */
if ((msgfd = queue_message_fd_r(Q_QUEUE, msgid)) == -1)
goto fail;
msgfp = fdopen(msgfd, "r");
if (msgfp == NULL)
fatal("fdopen");
/* init smtp session */
if ((cc = calloc(1, sizeof(*cc))) == NULL)
goto fail;
cc->pcb = client_init(fd, msgfp, env->sc_hostname, 1);
cc->m = *m;
cc->msgfp = msgfp;
client_ssl_optional(cc->pcb);
client_sender(cc->pcb, "");
client_rcpt(cc->pcb, NULL, "%s@%s", m->sender.user,
m->sender.domain);
/* Construct an appropriate reason line. */
reason = m->errorline;
if (strlen(reason) > 4 && (*reason == '1' || *reason == '6'))
reason += 4;
/* create message header */
/* XXX - The Date: header should be added during SMTP pickup. */
client_printf(cc->pcb,
"Subject: Delivery status notification\n"
"From: Mailer Daemon <MAILER-DAEMON@%s>\n"
"To: %s@%s\n"
"Date: %s\n"
"\n"
"Hi !\n"
"\n"
"This is the MAILER-DAEMON, please DO NOT REPLY to this e-mail.\n"
"An error has occurred while attempting to deliver a message.\n"
"\n"
"Recipient: %s@%s\n"
"Reason:\n"
"%s\n"
"\n"
"Below is a copy of the original message:\n"
"\n",
env->sc_hostname,
m->sender.user, m->sender.domain,
time_to_text(time(NULL)),
m->dest.user, m->dest.domain,
reason);
/* setup event */
session_socket_blockmode(fd, BM_NONBLOCK);
event_set(&cc->ev, fd, EV_READ|EV_WRITE, bounce_event, cc);
event_add(&cc->ev, &cc->pcb->timeout);
return 1;
fail:
if (cc)
fclose(cc->msgfp);
else if (msgfd != -1)
close(msgfd);
free(cc);
return 0;
}
void
bounce_event(int fd, short event, void *p)
{
struct client_ctx *cc = p;
char *ep = NULL;
if (event & EV_TIMEOUT) {
ep = "150 timeout";
goto out;
}
switch (client_talk(cc->pcb, event & EV_WRITE)) {
case CLIENT_STOP_WRITE:
goto ro;
case CLIENT_WANT_WRITE:
goto rw;
case CLIENT_RCPT_FAIL:
ep = cc->pcb->reply;
break;
case CLIENT_DONE:
ep = cc->pcb->status;
break;
default:
fatalx("bounce_event: unexpected code");
}
out:
if (*ep == '2' || *ep == '5' || *ep == '6') {
log_debug("#### %s: queue_envelope_delete: %016" PRIx64,
__func__, cc->m.id);
queue_envelope_delete(Q_QUEUE, &cc->m);
} else {
cc->m.status = DS_TEMPFAILURE;
cc->m.retry++;
envelope_set_errormsg(&cc->m, "%s", ep);
queue_envelope_update(Q_QUEUE, &cc->m);
}
stat_decrement(STATS_RUNNER);
stat_decrement(STATS_RUNNER_BOUNCES);
client_close(cc->pcb);
fclose(cc->msgfp);
free(cc);
return;
ro:
event_set(&cc->ev, fd, EV_READ, bounce_event, cc);
event_add(&cc->ev, &cc->pcb->timeout);
return;
rw:
event_set(&cc->ev, fd, EV_READ|EV_WRITE, bounce_event, cc);
event_add(&cc->ev, &cc->pcb->timeout);
}
int
bounce_record_message(struct envelope *e, struct envelope *bounce)
{
if (e->type == D_BOUNCE) {
log_debug("mailer daemons loop detected !");
return 0;
}
*bounce = *e;
bounce->type = D_BOUNCE;
bounce->status &= ~DS_PERMFAILURE;
bounce->retry = 0;
bounce->lasttry = 0;
return (queue_envelope_create(Q_QUEUE, bounce));
}
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