1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
|
/* $OpenBSD: bounce.c,v 1.19 2010/05/19 20:57:10 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 <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"
struct client_ctx {
struct event ev;
struct message m;
struct smtp_client *pcb;
struct smtpd *env;
};
void bounce_event(int, short, void *);
int
bounce_session(struct smtpd *env, int fd, struct message *messagep)
{
struct client_ctx *cc = NULL;
int msgfd = -1;
char *reason;
/* get message content */
if ((msgfd = queue_open_message_file(messagep->message_id)) == -1)
goto fail;
/* init smtp session */
if ((cc = calloc(1, sizeof(*cc))) == NULL)
goto fail;
cc->pcb = client_init(fd, msgfd, env->sc_hostname, 1);
cc->env = env;
cc->m = *messagep;
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:
close(msgfd);
if (cc && cc->pcb)
client_close(cc->pcb);
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);
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);
}
|
