masqmail-0.2

view src/accept.c @ 27:3654c502a4df

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g_malloc terminates the program on failure automatically
author meillo@marmaro.de
date Thu, 06 May 2010 11:50:40 +0200
parents 7c1635972aa7
children f4719cffc48c
line source
1 /* MasqMail
2 Copyright (C) 1999-2001 Oliver Kurth
3
4 This program is free software; you can redistribute it and/or modify
5 it under the terms of the GNU General Public License as published by
6 the Free Software Foundation; either version 2 of the License, or
7 (at your option) any later version.
8
9 This program is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 GNU General Public License for more details.
13
14 You should have received a copy of the GNU General Public License
15 along with this program; if not, write to the Free Software
16 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
17 */
18
19 #include "masqmail.h"
20 #include "readsock.h"
21
22 gchar *prot_names[] = {
23 "local",
24 "bsmtp",
25 "smtp",
26 "esmtp",
27 "pop3",
28 "apop",
29 "(unknown)" /* should not happen, but better than crashing. */
30 };
31
32 static gchar*
33 string_base62(gchar * res, guint value, gchar len)
34 {
35 static gchar base62_chars[] = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";
36 gchar *p = res + len;
37 *p = '\0';
38 while (p > res) {
39 *(--p) = base62_chars[value % 62];
40 value /= 62;
41 }
42 return res;
43 }
44
45 static gint
46 _g_list_addr_isequal(gconstpointer a, gconstpointer b)
47 {
48 address *addr1 = (address *) a;
49 address *addr2 = (address *) b;
50 int ret;
51
52 if ((ret = strcasecmp(addr1->domain, addr2->domain)) == 0)
53 return strcmp(addr1->local_part, addr2->local_part);
54 else
55 return ret;
56 }
57
58 /* accept message from anywhere.
59 A locally originating message is indicated by msg->recieved_host == NULL
60
61 If the flags ACC_DEL_RCPTS is set, recipients in the msg->rcpt_list is
62 copied and items occuring in it will be removed from the newly constructed
63 (from To/Cc/Bcc headers if ACC_RCPT_TO is set) rcpt_list.
64 */
65
66 accept_error
67 accept_message_stream(FILE * in, message * msg, guint flags)
68 {
69 gchar *line, *line1;
70 int line_size = MAX_DATALINE;
71 gboolean in_headers = TRUE;
72 header *hdr = NULL;
73 gint line_cnt = 0, data_size = 0;
74
75 line = g_malloc(line_size);
76 line[0] = '\0';
77
78 while (TRUE) {
79 int len = read_sockline1(in, &line, &line_size, 5 * 60, READSOCKL_CVT_CRLF);
80
81 line1 = line;
82
83 if ((line[0] == '.') && (!(flags & ACC_NODOT_TERM))) {
84 if (line[1] == '\n') {
85 g_free(line);
86 break;
87 }
88 line1++;
89 }
90
91 if (len <= 0) {
92 if ((len == -1) && ((flags & ACC_NODOT_TERM) || (flags & ACC_NODOT_RELAX))) {
93 /* we got an EOF, and the last line was not terminated by a CR */
94 gint len1 = strlen(line1);
95 if (len1 > 0) { /* == 0 is 'normal' (EOF after a CR) */
96 if (line1[len1 - 1] != '\n') { /* some mail clients allow unterminated lines */
97 line1[len1] = '\n';
98 line1[len1 + 1] = '\0';
99 msg->data_list = g_list_prepend(msg->data_list, g_strdup(line1));
100 data_size += strlen(line1);
101 line_cnt++;
102 }
103 }
104 break;
105 } else {
106 g_free(line);
107 if (len == -1) {
108 return AERR_EOF;
109 } else if (len == -2) {
110 /* should not happen any more */
111 return AERR_OVERFLOW;
112 } else if (len == -3) {
113 return AERR_TIMEOUT;
114 } else {
115 /* does not happen */
116 DEBUG(5) debugf("read_sockline returned %d\n", len);
117 return AERR_UNKNOWN;
118 }
119 }
120 } else {
121 if (in_headers) {
122
123 /* some pop servers send the 'From ' line, skip it: */
124 if (msg->hdr_list == NULL)
125 if (strncmp(line1, "From ", 5) == 0)
126 continue;
127
128 if (line1[0] == ' ' || line1[0] == '\t') {
129 /* continuation of 'folded' header: */
130 if (hdr) {
131 hdr->header = g_strconcat(hdr->header, line1, NULL);
132 }
133
134 } else if (line1[0] == '\n') {
135 /* an empty line marks end of headers */
136 in_headers = FALSE;
137 } else {
138 /* in all other cases we expect another header */
139 if ((hdr = get_header(line1)))
140 msg->hdr_list = g_list_append(msg->hdr_list, hdr);
141 else {
142 /* if get_header() returns NULL, no header was recognized,
143 so this seems to be the first data line of a broken mailer
144 which does not send an empty line after the headers */
145 in_headers = FALSE;
146 msg->data_list = g_list_prepend(msg->data_list, g_strdup(line1));
147 }
148 }
149 } else {
150 msg->data_list = g_list_prepend(msg->data_list, g_strdup(line1));
151 data_size += strlen(line1);
152 line_cnt++;
153 }
154 }
155 }
156
157 if (msg->data_list != NULL)
158 msg->data_list = g_list_reverse(msg->data_list);
159 else
160 /* make sure data list is not NULL: */
161 msg->data_list = g_list_append(NULL, g_strdup(""));
162
163 DEBUG(4) debugf("received %d lines of data (%d bytes)\n", line_cnt, data_size);
164 /* we get here after we succesfully received the mail data */
165
166 msg->data_size = data_size;
167 msg->received_time = time(NULL);
168
169 return AERR_OK;
170 }
171
172 accept_error
173 accept_message_prepare(message * msg, guint flags)
174 {
175 struct passwd *passwd = NULL;
176 GList *non_rcpt_list = NULL;
177 time_t rec_time = time(NULL);
178
179 DEBUG(5) debugf("accept_message_prepare()\n");
180
181 /* create unique message id */
182 msg->uid = g_malloc(14);
183
184 string_base62(msg->uid, rec_time, 6);
185 msg->uid[6] = '-';
186 string_base62(&(msg->uid[7]), getpid(), 3);
187 msg->uid[10] = '-';
188 string_base62(&(msg->uid[11]), msg->transfer_id, 2);
189 msg->uid[13] = 0;
190
191 /* if local, get password entry */
192 if (msg->received_host == NULL) {
193 passwd = g_memdup(getpwuid(geteuid()), sizeof(struct passwd));
194 msg->ident = g_strdup(passwd->pw_name);
195 }
196
197 /* set return path if local */
198 if (msg->return_path == NULL && msg->received_host == NULL) {
199 gchar *path = g_strdup_printf("<%s@%s>", passwd->pw_name, conf.host_name);
200 DEBUG(3) debugf("setting return_path for local accept: %s\n", path);
201 msg->return_path = create_address(path, TRUE);
202 g_free(path);
203 }
204
205 /* -t option */
206 if (flags & ACC_DEL_RCPTS) {
207 non_rcpt_list = msg->rcpt_list;
208 msg->rcpt_list = NULL;
209 }
210
211 /* scan headers */
212 {
213 gboolean has_id = FALSE;
214 gboolean has_date = FALSE;
215 gboolean has_sender = FALSE;
216 gboolean has_from = FALSE;
217 gboolean has_rcpt = FALSE;
218 gboolean has_to_or_cc = FALSE;
219 GList *hdr_node, *hdr_node_next;
220 header *hdr;
221
222 for (hdr_node = g_list_first(msg->hdr_list);
223 hdr_node != NULL; hdr_node = hdr_node_next) {
224 hdr_node_next = g_list_next(hdr_node);
225 hdr = ((header *) (hdr_node->data));
226 DEBUG(5) debugf("scanning headers: %s", hdr->header);
227 switch (hdr->id) {
228 case HEAD_MESSAGE_ID:
229 has_id = TRUE;
230 break;
231 case HEAD_DATE:
232 has_date = TRUE;
233 break;
234 case HEAD_FROM:
235 has_from = TRUE;
236 break;
237 case HEAD_SENDER:
238 has_sender = TRUE;
239 break;
240 case HEAD_TO:
241 case HEAD_CC:
242 case HEAD_BCC:
243 has_rcpt = TRUE;
244 if (flags & ACC_RCPT_FROM_HEAD) {
245 DEBUG(5) debugf("hdr->value = %s\n", hdr->value);
246 if (hdr->value) {
247 msg->rcpt_list = addr_list_append_rfc822(msg->rcpt_list, hdr->value, conf.host_name);
248 }
249 }
250 if ((flags & ACC_DEL_BCC) && (hdr->id == HEAD_BCC)) {
251 DEBUG(3) debugf("removing 'Bcc' header\n");
252 msg->hdr_list = g_list_remove_link(msg->hdr_list, hdr_node);
253 g_list_free_1(hdr_node);
254 destroy_header(hdr);
255 } else
256 has_to_or_cc = TRUE;
257 break;
258 case HEAD_ENVELOPE_TO:
259 if (flags & ACC_SAVE_ENVELOPE_TO) {
260 DEBUG(3) debugf("creating 'X-Orig-Envelope-To' header\n");
261 msg->hdr_list = g_list_prepend(msg->hdr_list, create_header(HEAD_UNKNOWN,
262 "X-Orig-Envelope-to: %s", hdr->value));
263 }
264 DEBUG(3) debugf("removing 'Envelope-To' header\n");
265 msg->hdr_list = g_list_remove_link(msg->hdr_list, hdr_node);
266 g_list_free_1(hdr_node);
267 destroy_header(hdr);
268 break;
269 case HEAD_RETURN_PATH:
270 if (flags & ACC_MAIL_FROM_HEAD) {
271 /* usually POP3 accept */
272 msg->return_path = create_address_qualified(hdr->value, TRUE, msg->received_host);
273 DEBUG(3) debugf("setting return_path to %s\n", addr_string(msg->return_path));
274 }
275 DEBUG(3) debugf("removing 'Return-Path' header\n");
276 msg->hdr_list = g_list_remove_link(msg->hdr_list, hdr_node);
277 g_list_free_1(hdr_node);
278 destroy_header(hdr);
279 break;
280 default:
281 break; /* make compiler happy */
282 }
283 }
284
285 if (msg->return_path == NULL) {
286 /* this can happen for pop3 accept only and if no Return-path: header was given */
287 GList *hdr_list;
288 header *hdr;
289
290 DEBUG(3) debugf("return_path == NULL\n");
291
292 hdr_list = find_header(msg->hdr_list, HEAD_SENDER, NULL);
293 if (!hdr_list)
294 hdr_list = find_header(msg->hdr_list, HEAD_FROM, NULL);
295 if (hdr_list) {
296 gchar *addr;
297 hdr = (header *) (g_list_first(hdr_list)->data);
298
299 DEBUG(5) debugf("hdr->value = '%s'\n", hdr->value);
300
301 addr = g_strdup(hdr->value);
302 g_strchomp(addr);
303
304 if ((msg->return_path = create_address_qualified(addr, FALSE, msg->received_host)) != NULL) {
305 DEBUG(3) debugf("setting return_path to %s\n", addr_string(msg->return_path));
306 msg->hdr_list = g_list_append(msg->hdr_list, create_header(HEAD_UNKNOWN,
307 "X-Warning: return path set from %s address\n",
308 hdr->id == HEAD_SENDER ? "Sender:" : "From:"));
309 }
310 g_free(addr);
311 }
312 if (msg->return_path == NULL) { /* no Sender: or From: or create_address_qualified failed */
313 msg->return_path = create_address_qualified("postmaster", TRUE, conf.host_name);
314 DEBUG(3) debugf("setting return_path to %s\n", addr_string(msg->return_path));
315 msg->hdr_list = g_list_append(msg->hdr_list, create_header(HEAD_UNKNOWN,
316 "X-Warning: real return path is unknown\n"));
317 }
318 }
319
320 if (flags & ACC_DEL_RCPTS) {
321 GList *rcpt_node;
322 foreach(non_rcpt_list, rcpt_node) {
323 address *rcpt = (address *) (rcpt_node->data);
324 GList *node;
325 if ((node = g_list_find_custom(msg->rcpt_list, rcpt, _g_list_addr_isequal))) {
326 DEBUG(3) debugf("removing rcpt address %s\n", addr_string(node->data));
327 msg->rcpt_list = g_list_remove_link(msg->rcpt_list, node);
328 destroy_address((address *) (node->data));
329 g_list_free_1(node);
330 }
331 }
332 }
333
334 /* here we should have our recipients, fail if not: */
335 if (msg->rcpt_list == NULL) {
336 logwrite(LOG_WARNING, "no recipients found in message\n");
337 return AERR_NORCPT;
338 }
339
340 if (!(has_sender || has_from)) {
341 DEBUG(3) debugf("adding 'From' header\n");
342 msg->hdr_list = g_list_append(msg->hdr_list,
343 msg->full_sender_name
344 ?
345 create_header(HEAD_FROM, "From: \"%s\" <%s@%s>\n", msg->full_sender_name,
346 msg->return_path->local_part, msg->return_path->domain)
347 :
348 create_header(HEAD_FROM, "From: <%s@%s>\n",
349 msg->return_path->local_part, msg->return_path->domain)
350 );
351 }
352 if ((flags & ACC_HEAD_FROM_RCPT) && !has_rcpt) {
353 GList *node;
354 DEBUG(3) debugf("adding 'To' header(s)\n");
355 for (node = g_list_first(msg->rcpt_list); node; node = g_list_next(node)) {
356 msg->hdr_list = g_list_append(msg->hdr_list,
357 create_header(HEAD_TO, "To: %s\n", addr_string(msg-> return_path)));
358 }
359 }
360 if ((flags & ACC_DEL_BCC) && !has_to_or_cc) {
361 /* Bcc headers have been removed, and there are no remaining rcpt headers */
362 DEBUG(3) debugf("adding empty 'Bcc:' header\n");
363 msg->hdr_list = g_list_append(msg->hdr_list, create_header(HEAD_BCC, "Bcc:\n"));
364 }
365 if (!has_date) {
366 DEBUG(3) debugf("adding 'Date:' header\n");
367 msg->hdr_list = g_list_append(msg->hdr_list, create_header(HEAD_DATE, "Date: %s\n", rec_timestamp()));
368 }
369 if (!has_id) {
370 DEBUG(3) debugf("adding 'Message-ID:' header\n");
371 msg->hdr_list = g_list_append(msg->hdr_list,
372 create_header(HEAD_MESSAGE_ID, "Message-ID: <%s@%s>\n", msg->uid, conf.host_name));
373 }
374 }
375
376 /* Received header: */
377 /* At this point because we have to know the rcpts for the 'for' part */
378 if (!(flags & ACC_NO_RECVD_HDR)) {
379 gchar *for_string = NULL;
380 header *hdr = NULL;
381
382 DEBUG(3) debugf("adding 'Received:' header\n");
383
384 if (g_list_length(msg->rcpt_list) == 1) {
385 address *addr = (address *) (g_list_first(msg->rcpt_list)->data);
386 for_string = g_strdup_printf(" for %s", addr_string(addr));
387 }
388
389 if (msg->received_host == NULL) {
390 hdr = create_header(HEAD_RECEIVED, "Received: from %s by %s with %s (%s %s) id %s%s; %s\n",
391 passwd->pw_name, conf.host_name, prot_names[msg->received_prot],
392 PACKAGE, VERSION, msg->uid, for_string ? for_string : "", rec_timestamp());
393 } else {
394 #ifdef ENABLE_IDENT
395 DEBUG(5) debugf("adding 'Received:' header (5)\n");
396 hdr = create_header(HEAD_RECEIVED, "Received: from %s (ident=%s) by %s with %s (%s %s) id %s%s; %s\n",
397 msg->received_host, msg->ident ? msg->ident : "unknown", conf.host_name,
398 prot_names[msg->received_prot], PACKAGE, VERSION, msg->uid, for_string ? for_string : "",
399 rec_timestamp());
400 #else
401 hdr = create_header(HEAD_RECEIVED, "Received: from %s by %s with %s (%s %s) id %s%s; %s\n",
402 msg->received_host, conf.host_name, prot_names[msg->received_prot],
403 PACKAGE, VERSION, msg->uid, for_string ? for_string : "", rec_timestamp());
404 #endif
405 }
406 header_fold(hdr);
407 msg->hdr_list = g_list_prepend(msg->hdr_list, hdr);
408
409 if (for_string)
410 g_free(for_string);
411 }
412
413 /* write message to spool: */
414 /* accept is no longer responsible for this
415 if (!spool_write(msg, TRUE))
416 return AERR_NOSPOOL;
417 */
418 return AERR_OK;
419 }
420
421 accept_error
422 accept_message(FILE * in, message * msg, guint flags)
423 {
424 accept_error err;
425
426 err = accept_message_stream(in, msg, flags);
427 if (err == AERR_OK)
428 err = accept_message_prepare(msg, flags);
429
430 return err;
431 }