masqmail

view src/smtp_in.c @ 120:cd59a5b4d3dd

added support for SMTP SIZE 0 (unlimited)
author meillo@marmaro.de
date Thu, 01 Jul 2010 13:30:30 +0200
parents 5ec5e6637049
children dabd4e706b78
line source
1 /* MasqMail
2 Copyright (C) 1999-2001 Oliver Kurth
3 Copyright (C) 2010 markus schnalke <meillo@marmaro.de>
5 This program is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published by
7 the Free Software Foundation; either version 2 of the License, or
8 (at your option) any later version.
10 This program is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 GNU General Public License for more details.
15 You should have received a copy of the GNU General Public License
16 along with this program; if not, write to the Free Software
17 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
18 */
20 #include "masqmail.h"
21 #include "readsock.h"
23 /*
24 I always forget these rfc numbers:
25 RFC 821 (SMTP)
26 RFC 1869 (ESMTP)
27 RFC 1870 (ESMTP SIZE)
28 RFC 2197 (ESMTP PIPELINE)
29 RFC 2554 (ESMTP AUTH)
30 */
32 #ifdef ENABLE_SMTP_SERVER
34 smtp_cmd smtp_cmds[] = {
35 {SMTP_HELO, "HELO",},
36 {SMTP_EHLO, "EHLO",},
37 {SMTP_MAIL_FROM, "MAIL FROM:",},
38 {SMTP_RCPT_TO, "RCPT TO:",},
39 {SMTP_DATA, "DATA",},
40 {SMTP_QUIT, "QUIT",},
41 {SMTP_RSET, "RSET",},
42 {SMTP_NOOP, "NOOP",},
43 {SMTP_HELP, "HELP"},
44 };
46 static smtp_cmd_id
47 get_id(const gchar * line)
48 {
49 gint i;
50 for (i = 0; i < SMTP_NUM_IDS; i++) {
51 if (strncasecmp(smtp_cmds[i].cmd, line, strlen(smtp_cmds[i].cmd)) == 0) {
52 return (smtp_cmd_id) i;
53 }
54 }
55 return SMTP_ERROR;
56 }
58 static gboolean
59 get_size(gchar *line, unsigned long *msize) {
60 gchar *s = NULL;
62 /* hope we need not to handle cases like SiZe= ...*/
63 s = strstr(line, "SIZE=");
64 if (!s) {
65 /* try it in lowercase too */
66 if (!(s = strstr(line, "size="))) {
67 return FALSE;
68 }
69 }
70 s += 5;
71 *msize = atol(s);
72 DEBUG(5) debugf("get_size(): line=%s, msize=%ld\n", line, *msize);
74 return TRUE;
75 }
78 /* this is a quick hack: we expect the address to be syntactically correct
79 and containing the mailbox only, though we first check for size in
80 smtp_in().
81 */
82 static gboolean
83 get_address(gchar * line, gchar * addr)
84 {
85 gchar *p = line;
86 gchar *q = addr;
88 /* skip MAIL FROM: and RCPT TO: */
89 while (*p && (*p != ':')) {
90 p++;
91 }
92 p++;
94 /* skip spaces: */
95 while (*p && isspace(*p)) {
96 p++;
97 }
99 /* get address: */
100 while (*p && !isspace(*p) && (q < addr + MAX_ADDRESS - 1)) {
101 *(q++) = *(p++);
102 }
103 *q = 0;
105 return TRUE;
106 }
108 static smtp_connection*
109 create_base(gchar * remote_host)
110 {
111 smtp_connection *base = g_malloc(sizeof(smtp_connection));
112 if (!base) {
113 return NULL;
114 }
116 base->remote_host = g_strdup(remote_host);
118 base->prot = PROT_SMTP;
119 base->next_id = 0;
120 base->helo_seen = 0;
121 base->from_seen = 0;
122 base->rcpt_seen = 0;
123 base->msg = NULL;
125 return base;
126 }
128 static void
129 smtp_printf(FILE * out, gchar * fmt, ...)
130 {
131 va_list args;
132 va_start(args, fmt);
134 DEBUG(4) {
135 gchar buf[256];
136 va_list args_copy;
138 va_copy(args_copy, args);
139 vsnprintf(buf, 255, fmt, args_copy);
140 va_end(args_copy);
142 debugf(">>>%s", buf);
143 }
145 vfprintf(out, fmt, args);
146 fflush(out);
148 va_end(args);
149 }
151 void
152 smtp_in(FILE * in, FILE * out, gchar * remote_host, gchar * ident)
153 {
154 gchar *buffer;
155 smtp_cmd_id cmd_id;
156 message *msg = NULL;
157 smtp_connection *psc;
158 int len;
159 unsigned long size, msize;
161 DEBUG(5) debugf("smtp_in entered, remote_host = %s\n", remote_host);
163 psc = create_base(remote_host);
164 psc->msg = msg;
166 buffer = (gchar *) g_malloc(BUF_LEN);
167 if (!buffer) {
168 /* this check is actually unneccessary as g_malloc()
169 aborts on failure */
170 return;
171 }
173 /* send greeting string, containing ESMTP: */
174 smtp_printf(out, "220 %s MasqMail %s ESMTP\r\n", conf.host_name, VERSION);
176 while ((len = read_sockline(in, buffer, BUF_LEN, 5 * 60, READSOCKL_CHUG)) >= 0) {
177 cmd_id = get_id(buffer);
179 switch (cmd_id) {
180 case SMTP_EHLO:
181 psc->prot = PROT_ESMTP;
182 /* fall through */
183 case SMTP_HELO:
184 psc->helo_seen = TRUE;
186 if (conf.defer_all) { /* I need this to debug delivery failures */
187 smtp_printf(out, "421 %s service temporarily unavailable.\r\n", conf.host_name);
188 break;
189 }
191 if (psc->prot == PROT_ESMTP) {
192 smtp_printf(out, "250-%s Nice to meet you with ESMTP\r\n", conf.host_name);
193 smtp_printf(out, "250-SIZE %d\r\n", conf.max_msg_size);
194 smtp_printf(out, "250-PIPELINING\r\n" "250 HELP\r\n");
195 } else {
196 smtp_printf(out, "250 %s pretty old mailer, huh?\r\n", conf.host_name);
197 }
198 break;
200 case SMTP_MAIL_FROM:
201 if (get_size(buffer, &msize)) {
202 DEBUG(5) debugf("smtp_in(): get_size: msize=%ld, conf.mms=%d\n",
203 msize, conf.max_msg_size);
204 if (conf.max_msg_size && (msize > conf.max_msg_size)) {
205 smtp_printf(out, "552 Message size exceeds fixed limit.\r\n");
206 break;
207 }
208 }
210 {
211 gchar buf[MAX_ADDRESS];
212 address *addr;
214 if (!psc->helo_seen) {
215 smtp_printf(out, "503 need HELO or EHLO\r\n");
216 break;
217 }
218 if (psc->from_seen) {
219 smtp_printf(out, "503 MAIL FROM: already given.\r\n");
220 break;
221 }
223 msg = create_message();
224 msg->received_host = remote_host ? g_strdup(remote_host) : NULL;
225 msg->received_prot = psc->prot;
226 msg->ident = ident ? g_strdup(ident) : NULL;
227 /* get transfer id and increment for next one */
228 msg->transfer_id = (psc->next_id)++;
230 get_address(buffer, buf);
231 if (remote_host) {
232 addr = create_address(buf, TRUE);
233 } else {
234 addr = create_address_qualified(buf, TRUE, conf.host_name);
235 }
236 if (!addr) {
237 smtp_printf(out, "501 %s: syntax error.\r\n", buf);
238 } else if (!addr->domain) {
239 smtp_printf(out, "501 return path must be qualified.\r\n", buf);
240 } else {
241 psc->from_seen = TRUE;
242 msg->return_path = addr;
243 smtp_printf(out, "250 OK %s is a nice guy.\r\n", addr->address);
244 }
245 }
246 break;
248 case SMTP_RCPT_TO:
249 {
250 char buf[MAX_ADDRESS];
251 address *addr;
253 if (!psc->helo_seen) {
254 smtp_printf(out, "503 need HELO or EHLO.\r\n");
255 break;
256 }
257 if (!psc->from_seen) {
258 smtp_printf(out, "503 need MAIL FROM: before RCPT TO:\r\n");
259 break;
260 }
262 get_address(buffer, buf);
263 if (remote_host) {
264 addr = create_address(buf, TRUE);
265 } else {
266 addr = create_address_qualified(buf, TRUE, conf.host_name);
267 }
268 if (!addr) {
269 smtp_printf(out, "501 %s: syntax error in address.\r\n", buf);
270 break;
271 }
272 if (addr->local_part[0] == '|') {
273 smtp_printf(out, "501 %s: no pipe allowed for SMTP connections\r\n", buf);
274 break;
275 }
276 if (!addr->domain) {
277 smtp_printf(out, "501 recipient address must be qualified.\r\n", buf);
278 break;
279 }
280 gboolean do_relay = conf.do_relay;
281 if (!do_relay) {
282 do_relay = addr_is_local(msg->return_path);
283 if (!do_relay) {
284 do_relay = addr_is_local(addr);
285 }
286 }
287 if (!do_relay) {
288 smtp_printf(out, "550 relaying to %s denied.\r\n", addr_string(addr));
289 break;
290 }
291 psc->rcpt_seen = TRUE;
292 msg->rcpt_list = g_list_append(msg->rcpt_list, addr);
293 smtp_printf(out, "250 OK %s is our friend.\r\n", addr->address);
294 }
295 break;
297 case SMTP_DATA:
298 if (!psc->helo_seen) {
299 smtp_printf(out, "503 need HELO or EHLO.\r\n");
300 break;
301 }
302 if (!psc->rcpt_seen) {
303 smtp_printf(out, "503 need RCPT TO: before DATA\r\n");
304 break;
305 }
306 accept_error err;
308 smtp_printf(out, "354 okay, and do not forget the dot\r\n");
310 err = accept_message(in, msg, conf.do_save_envelope_to ? ACC_SAVE_ENVELOPE_TO : 0);
311 if (err != AERR_OK) {
312 switch (err) {
313 case AERR_TIMEOUT:
314 case AERR_EOF:
315 return;
316 case AERR_SIZE:
317 smtp_printf(out, "552 Error: message too large.\r\n");
318 return;
319 default:
320 /* should never happen: */
321 smtp_printf(out, "451 Unknown error\r\n");
322 return;
323 }
324 }
327 if (!spool_write(msg, TRUE)) {
328 smtp_printf(out, "451 Could not write spool file\r\n");
329 return;
330 }
331 pid_t pid;
332 smtp_printf(out, "250 OK id=%s\r\n", msg->uid);
334 if (remote_host != NULL) {
335 logwrite(LOG_NOTICE, "%s <= <%s@%s> host=%s with %s\n", msg->uid,
336 msg->return_path->local_part, msg->return_path->domain,
337 remote_host, prot_names[psc->prot]);
338 } else {
339 logwrite(LOG_NOTICE, "%s <= <%s@%s> with %s\n", msg->uid,
340 msg->return_path->local_part, msg->return_path->domain,
341 prot_names[psc->prot]);
342 }
344 if (conf.do_queue) {
345 DEBUG(1) debugf("queuing forced by configuration or option.\n");
346 } else {
347 pid = fork();
348 if (pid == 0) {
349 _exit(deliver(msg));
350 } else if (pid < 0) {
351 logwrite(LOG_ALERT, "could not fork for delivery, id = %s", msg->uid);
352 }
353 }
354 psc->rcpt_seen = psc->from_seen = FALSE;
355 destroy_message(msg);
356 msg = NULL;
357 break;
359 case SMTP_QUIT:
360 smtp_printf(out, "221 goodbye\r\n");
361 destroy_message(msg);
362 msg = NULL;
363 return;
365 case SMTP_RSET:
366 psc->from_seen = psc->rcpt_seen = FALSE;
367 destroy_message(msg);
368 msg = NULL;
369 smtp_printf(out, "250 OK\r\n");
370 break;
372 case SMTP_NOOP:
373 smtp_printf(out, "250 OK\r\n");
374 break;
376 case SMTP_HELP:
377 {
378 int i;
380 smtp_printf(out, "214-supported commands:\r\n");
381 for (i = 0; i < SMTP_NUM_IDS - 1; i++) {
382 smtp_printf(out, "214-%s\r\n", smtp_cmds[i].cmd);
383 }
384 smtp_printf(out, "214 %s\r\n", smtp_cmds[i].cmd);
385 }
386 break;
388 default:
389 smtp_printf(out, "501 command not recognized\r\n");
390 DEBUG(1) debugf("command not recognized, was '%s'\n", buffer);
391 break;
392 }
393 }
394 switch (len) {
395 case -3:
396 logwrite(LOG_NOTICE, "connection timed out\n");
397 break;
398 case -2:
399 logwrite(LOG_NOTICE, "line overflow\n");
400 break;
401 case -1:
402 logwrite(LOG_NOTICE, "received EOF\n");
403 break;
404 default:
405 break;
406 }
407 }
408 #endif