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/* $OpenBSD: bounce.c,v 1.9 2009/09/16 15:33:06 jacekm 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 <pwd.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "smtpd.h"
#include "client.h"
struct client_ctx {
struct event ev;
struct message m;
struct smtp_client *sp;
};
void bounce_event(int, short, void *);
void
bounce_process(struct smtpd *env, struct message *message)
{
imsg_compose_event(env->sc_ievs[PROC_SMTP], IMSG_SMTP_ENQUEUE, 0, 0, -1,
message, sizeof(*message));
}
int
bounce_session(struct smtpd *env, int fd, struct message *messagep)
{
struct client_ctx *cc = NULL;
int msgfd = -1;
/* init smtp session */
if ((cc = calloc(1, sizeof(*cc))) == NULL)
goto fail;
if ((cc->sp = client_init(fd, env->sc_hostname)) == NULL)
goto fail;
cc->m = *messagep;
if (client_ssl_optional(cc->sp) < 0)
goto fail;
/* assign recipient */
if (client_rcpt(cc->sp, "%s@%s", messagep->sender.user,
messagep->sender.domain) < 0)
goto fail;
/* create message header */
if (client_data_printf(cc->sp,
"Subject: Delivery status notification\n"
"From: Mailer Daemon <MAILER-DAEMON@%s>\n"
"To: %s@%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,
messagep->recipient.user, messagep->recipient.domain,
messagep->session_errorline) < 0)
goto fail;
/* append original message */
if ((msgfd = queue_open_message_file(messagep->message_id)) == -1)
goto fail;
if (client_data_fd(cc->sp, msgfd) < 0)
goto fail;
close(msgfd);
msgfd = -1;
/* setup event */
session_socket_blockmode(fd, BM_NONBLOCK);
event_set(&cc->ev, fd, EV_WRITE, bounce_event, cc);
event_add(&cc->ev, client_timeout(cc->sp));
return 1;
fail:
close(msgfd);
if (cc && cc->sp)
client_close(cc->sp);
free(cc);
return 0;
}
void
bounce_event(int fd, short event, void *p)
{
struct client_ctx *cc = p;
char *ep = NULL;
int error = 0;
int (*iofunc)(struct smtp_client *);
if (event & EV_TIMEOUT) {
message_set_errormsg(&cc->m, "150 timeout");
cc->m.status = S_MESSAGE_TEMPFAILURE;
queue_message_update(&cc->m);
client_close(cc->sp);
free(cc);
return;
}
if (event & EV_READ)
iofunc = client_read;
else
iofunc = client_write;
switch (iofunc(cc->sp)) {
case CLIENT_WANT_READ:
event_set(&cc->ev, fd, EV_READ, bounce_event, cc);
event_add(&cc->ev, client_timeout(cc->sp));
return;
case CLIENT_WANT_WRITE:
event_set(&cc->ev, fd, EV_WRITE, bounce_event, cc);
event_add(&cc->ev, client_timeout(cc->sp));
return;
case CLIENT_ERROR:
error = 1;
case CLIENT_RCPT_FAIL:
case CLIENT_DONE:
break;
}
if (error)
ep = client_strerror(cc->sp);
else
ep = client_reply(cc->sp);
if (*ep == '2')
queue_remove_envelope(&cc->m);
else {
if (*ep == '5')
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);
}
client_close(cc->sp);
free(cc);
}
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