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/* $OpenBSD: bounce.c,v 1.26 2011/03/26 10:59:59 gilles 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 <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 message m;
struct smtp_client *pcb;
struct smtpd *env;
FILE *msgfp;
};
int
bounce_session(struct smtpd *env, int fd, struct message *messagep)
{
struct client_ctx *cc = NULL;
int msgfd = -1;
char *reason;
FILE *msgfp = NULL;
/* get message content */
if ((msgfd = queue_open_message_file(messagep->message_id)) == -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->env = env;
cc->m = *messagep;
cc->msgfp = msgfp;
client_ssl_optional(cc->pcb);
client_sender(cc->pcb, "");
client_rcpt(cc->pcb, NULL, "%s@%s", messagep->sender.user,
messagep->sender.domain);
/* Construct an appropriate reason line. */
reason = messagep->session_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,
messagep->sender.user, messagep->sender.domain,
time_to_text(time(NULL)),
messagep->recipient.user, messagep->recipient.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')
queue_remove_envelope(&cc->m);
else {
if (*ep == '5' || *ep == '6')
cc->m.status = S_MESSAGE_PERMFAILURE;
else
cc->m.status = S_MESSAGE_TEMPFAILURE;
message_set_errormsg(&cc->m, "%s", ep);
queue_message_update(&cc->m);
}
cc->env->stats->runner.active--;
cc->env->stats->runner.bounces_active--;
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);
}
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