masqmail

view src/accept.c @ 239:31ee44f45787

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refactored alias.c heavily especially substituted the loop-based alias_expand() with a recursive approach. Now alias_expand() wraps alias_one() which recursively expands aliases. In principle the ``data processing'' is the same but now it's clearer structured and thus easier to understand IMO. The loop might have been faster but I don't care for speed -- the most simple solution is the best. It's fast enough, that is sufficient.
author markus schnalke <meillo@marmaro.de>
date Mon, 25 Oct 2010 15:35:28 -0300
parents 89f951be358f
children 409552c5647f
line source
1 /* MasqMail
2 Copyright (C) 1999-2001 Oliver Kurth
3 Copyright (C) 2010 markus schnalke <meillo@marmaro.de>
4
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.
9
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.
14
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 */
19
20 #include "masqmail.h"
21 #include "readsock.h"
22
23 gchar *prot_names[] = {
24 "local",
25 "bsmtp",
26 "smtp",
27 "esmtp",
28 "(unknown)" /* should not happen, but better than crashing. */
29 };
30
31 static gchar*
32 string_base62(gchar * res, guint value, gchar len)
33 {
34 static gchar base62_chars[] = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";
35 gchar *p = res + len;
36 *p = '\0';
37 while (p > res) {
38 *(--p) = base62_chars[value % 62];
39 value /= 62;
40 }
41 return res;
42 }
43
44 static gint
45 _g_list_addr_isequal(gconstpointer a, gconstpointer b)
46 {
47 address *addr1 = (address *) a;
48 address *addr2 = (address *) b;
49 int ret;
50
51 if ((ret = strcasecmp(addr1->domain, addr2->domain)) == 0)
52 return strcmp(addr1->local_part, addr2->local_part);
53 else
54 return ret;
55 }
56
57 /* accept message from anywhere.
58 A locally originating message is indicated by msg->recieved_host == NULL
59
60 The -t option:
61 The ACC_RCPT_FROM_HEAD flag adds the recipients found in To/Cc/Bcc
62 headers to the recipients list.
63 The ACC_DEL_RCPTS flag makes only sense if the ACC_RCPT_FROM_HEAD
64 flag is given too. With ACC_DEL_RCPTS the recipients given on the
65 command line are removed from the ones given in headers.
66 */
67
68 accept_error
69 accept_message_stream(FILE * in, message * msg, guint flags)
70 {
71 gchar *line, *line1;
72 int line_size = MAX_DATALINE;
73 gboolean in_headers = TRUE;
74 header *hdr = NULL;
75 gint line_cnt = 0, data_size = 0;
76
77 line = g_malloc(line_size);
78 line[0] = '\0';
79
80 while (TRUE) {
81 int len = read_sockline1(in, &line, &line_size, 5 * 60, READSOCKL_CVT_CRLF);
82
83 line1 = line;
84
85 if ((line[0] == '.') && (!(flags & ACC_DOT_IGNORE))) {
86 if (line[1] == '\n') {
87 g_free(line);
88 break;
89 }
90 line1++;
91 }
92
93 if (len <= 0) {
94 if ((len == -1) && (flags & (ACC_DOT_IGNORE | ACC_NODOT_RELAX))) {
95 /* we got an EOF, and the last line was not terminated by a CR */
96 gint len1 = strlen(line1);
97 if (len1 > 0) { /* == 0 is 'normal' (EOF after a CR) */
98 if (line1[len1 - 1] != '\n') { /* some mail clients allow unterminated lines */
99 line1[len1] = '\n';
100 line1[len1 + 1] = '\0';
101 msg->data_list = g_list_prepend(msg->data_list, g_strdup(line1));
102 data_size += strlen(line1);
103 line_cnt++;
104 }
105 }
106 break;
107 } else {
108 g_free(line);
109 if (len == -1) {
110 return AERR_EOF;
111 } else if (len == -2) {
112 /* should not happen any more */
113 return AERR_OVERFLOW;
114 } else if (len == -3) {
115 return AERR_TIMEOUT;
116 } else {
117 /* does not happen */
118 DEBUG(5) debugf("read_sockline returned %d\n", len);
119 return AERR_UNKNOWN;
120 }
121 }
122 } else {
123 if (in_headers) {
124
125 /* some pop servers send the 'From ' line, skip it: */
126 if (msg->hdr_list == NULL)
127 if (strncmp(line1, "From ", 5) == 0)
128 continue;
129
130 if (line1[0] == ' ' || line1[0] == '\t') {
131 /* continuation of 'folded' header: */
132 if (hdr) {
133 hdr->header = g_strconcat(hdr->header, line1, NULL);
134 }
135
136 } else if (line1[0] == '\n') {
137 /* an empty line marks end of headers */
138 in_headers = FALSE;
139 } else {
140 /* in all other cases we expect another header */
141 if ((hdr = get_header(line1)))
142 msg->hdr_list = g_list_append(msg->hdr_list, hdr);
143 else {
144 /* if get_header() returns NULL, no header was recognized,
145 so this seems to be the first data line of a broken mailer
146 which does not send an empty line after the headers */
147 in_headers = FALSE;
148 msg->data_list = g_list_prepend(msg->data_list, g_strdup(line1));
149 }
150 }
151 } else {
152 msg->data_list = g_list_prepend(msg->data_list, g_strdup(line1));
153 data_size += strlen(line1);
154 line_cnt++;
155 }
156 }
157 if (conf.max_msg_size && (data_size > conf.max_msg_size)) {
158 DEBUG(4) debugf("accept_message_stream(): "
159 "received %d bytes (conf.max_msg_size=%d)\n",
160 data_size, conf.max_msg_size);
161 return AERR_SIZE;
162 }
163
164 }
165
166 if (msg->data_list != NULL)
167 msg->data_list = g_list_reverse(msg->data_list);
168 else
169 /* make sure data list is not NULL: */
170 msg->data_list = g_list_append(NULL, g_strdup(""));
171
172 DEBUG(4) debugf("received %d lines of data (%d bytes)\n", line_cnt, data_size);
173 /* we get here after we succesfully received the mail data */
174
175 msg->data_size = data_size;
176 msg->received_time = time(NULL);
177
178 return AERR_OK;
179 }
180
181 accept_error
182 accept_message_prepare(message * msg, guint flags)
183 {
184 struct passwd *passwd = NULL;
185 GList *non_rcpt_list = NULL;
186 time_t rec_time = time(NULL);
187
188 DEBUG(5) debugf("accept_message_prepare()\n");
189
190 /* create unique message id */
191 msg->uid = g_malloc(14);
192
193 string_base62(msg->uid, rec_time, 6);
194 msg->uid[6] = '-';
195 string_base62(&(msg->uid[7]), getpid(), 3);
196 msg->uid[10] = '-';
197 string_base62(&(msg->uid[11]), msg->transfer_id, 2);
198 msg->uid[13] = 0;
199
200 /* if local, get password entry */
201 if (msg->received_host == NULL) {
202 passwd = g_memdup(getpwuid(geteuid()), sizeof(struct passwd));
203 msg->ident = g_strdup(passwd->pw_name);
204 }
205
206 /* set return path if local */
207 if (msg->return_path == NULL && msg->received_host == NULL) {
208 gchar *path = g_strdup_printf("<%s@%s>", passwd->pw_name, conf.host_name);
209 DEBUG(3) debugf("setting return_path for local accept: %s\n", path);
210 msg->return_path = create_address(path, TRUE);
211 g_free(path);
212 }
213
214 /* -t option (see comment above) */
215 if (flags & ACC_DEL_RCPTS) {
216 non_rcpt_list = msg->rcpt_list;
217 msg->rcpt_list = NULL;
218 }
219
220 /* scan headers */
221 {
222 gboolean has_id = FALSE;
223 gboolean has_date = FALSE;
224 gboolean has_sender = FALSE;
225 gboolean has_from = FALSE;
226 gboolean has_to_or_cc = FALSE;
227 GList *hdr_node, *hdr_node_next;
228 header *hdr;
229
230 for (hdr_node = g_list_first(msg->hdr_list);
231 hdr_node != NULL; hdr_node = hdr_node_next) {
232 hdr_node_next = g_list_next(hdr_node);
233 hdr = ((header *) (hdr_node->data));
234 DEBUG(5) debugf("scanning headers: %s", hdr->header);
235 switch (hdr->id) {
236 case HEAD_MESSAGE_ID:
237 has_id = TRUE;
238 break;
239 case HEAD_DATE:
240 has_date = TRUE;
241 break;
242 case HEAD_FROM:
243 has_from = TRUE;
244 break;
245 case HEAD_SENDER:
246 has_sender = TRUE;
247 break;
248 case HEAD_TO:
249 case HEAD_CC:
250 has_to_or_cc = TRUE;
251 /* fall through */
252 case HEAD_BCC:
253 if (flags & ACC_RCPT_FROM_HEAD) {
254 /* -t option (see comment above) */
255 DEBUG(5) debugf("hdr->value = %s\n", hdr->value);
256 if (hdr->value) {
257 msg->rcpt_list = addr_list_append_rfc822(msg->rcpt_list, hdr->value, conf.host_name);
258 }
259 }
260 if (hdr->id == HEAD_BCC) {
261 DEBUG(3) debugf("removing 'Bcc' header\n");
262 msg->hdr_list = g_list_remove_link(msg->hdr_list, hdr_node);
263 g_list_free_1(hdr_node);
264 destroy_header(hdr);
265 }
266 break;
267 case HEAD_ENVELOPE_TO:
268 if (flags & ACC_SAVE_ENVELOPE_TO) {
269 DEBUG(3) debugf("creating 'X-Orig-Envelope-To' header\n");
270 msg->hdr_list = g_list_prepend(msg->hdr_list, create_header(HEAD_UNKNOWN,
271 "X-Orig-Envelope-to: %s", hdr->value));
272 }
273 DEBUG(3) debugf("removing 'Envelope-To' header\n");
274 msg->hdr_list = g_list_remove_link(msg->hdr_list, hdr_node);
275 g_list_free_1(hdr_node);
276 destroy_header(hdr);
277 break;
278 case HEAD_RETURN_PATH:
279 if (flags & ACC_MAIL_FROM_HEAD) {
280 /* usually POP3 accept */
281 msg->return_path = create_address_qualified(hdr->value, TRUE, msg->received_host);
282 DEBUG(3) debugf("setting return_path to %s\n", addr_string(msg->return_path));
283 }
284 DEBUG(3) debugf("removing 'Return-Path' header\n");
285 msg->hdr_list = g_list_remove_link(msg->hdr_list, hdr_node);
286 g_list_free_1(hdr_node);
287 destroy_header(hdr);
288 break;
289 default:
290 break; /* make compiler happy */
291 }
292 }
293
294 if (msg->return_path == NULL) {
295 /* this can happen for pop3 accept only and if no Return-path: header was given */
296 GList *hdr_list;
297 header *hdr;
298
299 DEBUG(3) debugf("return_path == NULL\n");
300
301 hdr_list = find_header(msg->hdr_list, HEAD_SENDER, NULL);
302 if (!hdr_list)
303 hdr_list = find_header(msg->hdr_list, HEAD_FROM, NULL);
304 if (hdr_list) {
305 gchar *addr;
306 hdr = (header *) (g_list_first(hdr_list)->data);
307
308 DEBUG(5) debugf("hdr->value = '%s'\n", hdr->value);
309
310 addr = g_strdup(hdr->value);
311 g_strchomp(addr);
312
313 if ((msg->return_path = create_address_qualified(addr, FALSE, msg->received_host)) != NULL) {
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: return path set from %s address\n",
317 hdr->id == HEAD_SENDER ? "Sender:" : "From:"));
318 }
319 g_free(addr);
320 }
321 if (msg->return_path == NULL) { /* no Sender: or From: or create_address_qualified failed */
322 msg->return_path = create_address_qualified("postmaster", TRUE, conf.host_name);
323 DEBUG(3) debugf("setting return_path to %s\n", addr_string(msg->return_path));
324 msg->hdr_list = g_list_append(msg->hdr_list, create_header(HEAD_UNKNOWN,
325 "X-Warning: real return path is unknown\n"));
326 }
327 }
328
329 if (flags & ACC_DEL_RCPTS) {
330 /* remove the recipients given on the command line from the ones given in headers
331 -t option (see comment above) */
332 GList *rcpt_node;
333 foreach(non_rcpt_list, rcpt_node) {
334 address *rcpt = (address *) (rcpt_node->data);
335 GList *node;
336 if ((node = g_list_find_custom(msg->rcpt_list, rcpt, _g_list_addr_isequal))) {
337 DEBUG(3) debugf("removing rcpt address %s\n", addr_string(node->data));
338 msg->rcpt_list = g_list_remove_link(msg->rcpt_list, node);
339 destroy_address((address *) (node->data));
340 g_list_free_1(node);
341 }
342 }
343 }
344
345 /* here we should have our recipients, fail if not: */
346 if (msg->rcpt_list == NULL) {
347 logwrite(LOG_WARNING, "no recipients found in message\n");
348 return AERR_NORCPT;
349 }
350
351 if (!(has_sender || has_from)) {
352 DEBUG(3) debugf("adding 'From' header\n");
353 msg->hdr_list = g_list_append(msg->hdr_list,
354 msg->full_sender_name
355 ?
356 create_header(HEAD_FROM, "From: \"%s\" <%s@%s>\n", msg->full_sender_name,
357 msg->return_path->local_part, msg->return_path->domain)
358 :
359 create_header(HEAD_FROM, "From: <%s@%s>\n",
360 msg->return_path->local_part, msg->return_path->domain)
361 );
362 }
363 if (!has_to_or_cc) {
364 DEBUG(3) debugf("no To: or Cc: header, hence adding `To: undisclosed recipients:;'\n");
365 msg->hdr_list = g_list_append(msg->hdr_list, create_header(HEAD_TO, "To: undisclosed-recipients:;\n"));
366 }
367 if (!has_date) {
368 DEBUG(3) debugf("adding 'Date:' header\n");
369 msg->hdr_list = g_list_append(msg->hdr_list, create_header(HEAD_DATE, "Date: %s\n", rec_timestamp()));
370 }
371 if (!has_id) {
372 DEBUG(3) debugf("adding 'Message-ID:' header\n");
373 msg->hdr_list = g_list_append(msg->hdr_list,
374 create_header(HEAD_MESSAGE_ID, "Message-ID: <%s@%s>\n", msg->uid, conf.host_name));
375 }
376 }
377
378 /* Received header: */
379 /* At this point because we have to know the rcpts for the 'for' part */
380 gchar *for_string = NULL;
381 header *hdr = NULL;
382
383 DEBUG(3) debugf("adding 'Received:' header\n");
384
385 if (g_list_length(msg->rcpt_list) == 1) {
386 address *addr = (address *) (g_list_first(msg->rcpt_list)->data);
387 for_string = g_strdup_printf(" for %s", addr_string(addr));
388 }
389
390 if (msg->received_host == NULL) {
391 /* received locally */
392 hdr = create_header(HEAD_RECEIVED, "Received: from %s by %s with %s (%s %s) id %s%s; %s\n",
393 passwd->pw_name, conf.host_name, prot_names[msg->received_prot],
394 PACKAGE, VERSION, msg->uid, for_string ? for_string : "", rec_timestamp());
395 } else {
396 /* received from remote */
397 #ifdef ENABLE_IDENT
398 DEBUG(5) debugf("adding 'Received:' header (5)\n");
399 hdr = create_header(HEAD_RECEIVED, "Received: from %s (ident=%s) by %s with %s (%s %s) id %s%s; %s\n",
400 msg->received_host, msg->ident ? msg->ident : "unknown", conf.host_name,
401 prot_names[msg->received_prot], PACKAGE, VERSION, msg->uid, for_string ? for_string : "",
402 rec_timestamp());
403 #else
404 hdr = create_header(HEAD_RECEIVED, "Received: from %s by %s with %s (%s %s) id %s%s; %s\n",
405 msg->received_host, conf.host_name, prot_names[msg->received_prot],
406 PACKAGE, VERSION, msg->uid, for_string ? for_string : "", rec_timestamp());
407 #endif
408 }
409 header_fold(hdr);
410 msg->hdr_list = g_list_prepend(msg->hdr_list, hdr);
411
412 if (for_string)
413 g_free(for_string);
414
415 /* write message to spool: */
416 /* accept is no longer responsible for this
417 if (!spool_write(msg, TRUE))
418 return AERR_NOSPOOL;
419 */
420 return AERR_OK;
421 }
422
423 accept_error
424 accept_message(FILE * in, message * msg, guint flags)
425 {
426 accept_error err;
427
428 err = accept_message_stream(in, msg, flags);
429 if (err == AERR_OK)
430 err = accept_message_prepare(msg, flags);
431
432 return err;
433 }