masqmail

view src/accept.c @ 309:273f6c9eb6a2

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bug fix: off-by-one in pipe aliases
author meillo@marmaro.de
date Sun, 24 Apr 2011 19:02:09 +0200
parents 3e3c280ca5b2
children 29de6a1c4538
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 /* must match PROT_* in masqmail.h */
24 gchar *prot_names[] = {
25 "local",
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 }
54 return ret;
55 }
56
57 /* accept message from anywhere.
58 A message from local is indicated by msg->recieved_host == NULL
59
60 The -t option: With the ACC_RCPT_FROM_HEAD flag the addrs found found
61 in To/Cc/Bcc headers are added to the recipient list.
62 */
63
64 accept_error
65 accept_message_stream(FILE * in, message * msg, guint flags)
66 {
67 gchar *line, *line1;
68 int line_size = MAX_DATALINE;
69 gboolean in_headers = TRUE;
70 header *hdr = NULL;
71 gint line_cnt = 0, data_size = 0;
72
73 line = g_malloc(line_size);
74 line[0] = '\0';
75
76 while (TRUE) {
77 int len = read_sockline1(in, &line, &line_size, 5 * 60, READSOCKL_CVT_CRLF);
78
79 line1 = line;
80
81 if ((line[0] == '.') && (!(flags & ACC_DOT_IGNORE))) {
82 if (line[1] == '\n') {
83 g_free(line);
84 break;
85 }
86 line1++;
87 }
88
89 if ((len == -1) && (flags & (ACC_DOT_IGNORE | ACC_NODOT_RELAX))) {
90 /* we got an EOF, and the last line was not terminated by a CR */
91 gint len1 = strlen(line1);
92 if (len1 > 0) { /* == 0 is 'normal' (EOF after a CR) */
93 if (line1[len1 - 1] != '\n') { /* some mail clients allow unterminated lines */
94 line1[len1] = '\n';
95 line1[len1 + 1] = '\0';
96 msg->data_list = g_list_prepend(msg->data_list, g_strdup(line1));
97 data_size += strlen(line1);
98 line_cnt++;
99 }
100 }
101 break;
102
103 } else if (len == -1) {
104 g_free(line);
105 return AERR_EOF;
106
107 } else if (len == -2) {
108 /* should not happen any more */
109 g_free(line);
110 return AERR_OVERFLOW;
111
112 } else if (len == -3) {
113 g_free(line);
114 return AERR_TIMEOUT;
115
116 } else if (len <= 0) {
117 /* does not happen */
118 g_free(line);
119 DEBUG(5) debugf("read_sockline returned %d\n", len);
120 return AERR_UNKNOWN;
121
122 }
123
124 if (in_headers) {
125
126 /* some pop servers send the 'From ' line, skip it: */
127 if (!msg->hdr_list && strncmp(line1, "From ", 5) == 0) {
128 continue;
129 }
130
131 if (line1[0] == ' ' || line1[0] == '\t') {
132 /* continuation of 'folded' header: */
133 if (hdr) {
134 hdr->header = g_strconcat(hdr->header, line1, NULL);
135 }
136
137 } else if (line1[0] == '\n') {
138 /* an empty line marks end of headers */
139 in_headers = FALSE;
140 } else {
141 /* in all other cases we expect another header */
142 if ((hdr = get_header(line1))) {
143 msg->hdr_list = g_list_append(msg->hdr_list, hdr);
144 } else {
145 /* if get_header() returns NULL, no header was recognized,
146 so this seems to be the first data line of a broken mailer
147 which does not send an empty line after the headers */
148 in_headers = FALSE;
149 msg->data_list = g_list_prepend(msg->data_list, g_strdup(line1));
150 }
151 }
152 } else {
153 /* message body */
154 msg->data_list = g_list_prepend(msg->data_list, g_strdup(line1));
155 data_size += strlen(line1);
156 line_cnt++;
157 }
158
159 if (conf.max_msg_size && (data_size > conf.max_msg_size)) {
160 DEBUG(4) debugf("accept_message_stream(): "
161 "received %d bytes (conf.max_msg_size=%d)\n",
162 data_size, conf.max_msg_size);
163 return AERR_SIZE;
164 }
165
166 }
167
168 DEBUG(4) debugf("received %d lines of data (%d bytes)\n", line_cnt, data_size);
169
170 if (!msg->data_list) {
171 /* make sure data list is not NULL: */
172 msg->data_list = g_list_append(NULL, g_strdup(""));
173 }
174 msg->data_list = g_list_reverse(msg->data_list);
175
176 /* we get here after we succesfully received the mail data */
177
178 msg->data_size = data_size;
179 msg->received_time = time(NULL);
180
181 return AERR_OK;
182 }
183
184 accept_error
185 accept_message_prepare(message * msg, guint flags)
186 {
187 struct passwd *passwd = NULL;
188 time_t rec_time = time(NULL);
189
190 DEBUG(5) debugf("accept_message_prepare()\n");
191
192 /* create unique message id */
193 msg->uid = g_malloc(14);
194 string_base62(msg->uid, rec_time, 6);
195 msg->uid[6] = '-';
196 string_base62(msg->uid + 7, getpid(), 3);
197 msg->uid[10] = '-';
198 string_base62(msg->uid + 11, msg->transfer_id, 2);
199 msg->uid[13] = '\0';
200
201 /* if local, get password entry and set return path if missing */
202 if (!msg->received_host) {
203 passwd = g_memdup(getpwuid(geteuid()), sizeof(struct passwd));
204 msg->ident = g_strdup(passwd->pw_name);
205 if (!msg->return_path) {
206 gchar *path = g_strdup_printf("<%s@%s>", passwd->pw_name, conf.host_name);
207 DEBUG(3) debugf("setting return_path for local accept: %s\n", path);
208 msg->return_path = create_address(path, TRUE);
209 g_free(path);
210 }
211 }
212
213 /* scan headers */
214 {
215 gboolean has_id = FALSE;
216 gboolean has_date = FALSE;
217 gboolean has_sender = FALSE;
218 gboolean has_from = FALSE;
219 gboolean has_to_or_cc = FALSE;
220 GList *hdr_node, *hdr_node_next;
221 header *hdr;
222
223 for (hdr_node = g_list_first(msg->hdr_list);
224 hdr_node;
225 hdr_node = hdr_node_next) {
226 hdr_node_next = g_list_next(hdr_node);
227 hdr = ((header *) (hdr_node->data));
228 DEBUG(5) debugf("scanning headers: %s", hdr->header);
229 switch (hdr->id) {
230 case HEAD_MESSAGE_ID:
231 has_id = TRUE;
232 break;
233 case HEAD_DATE:
234 has_date = TRUE;
235 break;
236 case HEAD_FROM:
237 has_from = TRUE;
238 break;
239 case HEAD_SENDER:
240 has_sender = TRUE;
241 break;
242 case HEAD_TO:
243 case HEAD_CC:
244 has_to_or_cc = TRUE;
245 /* fall through */
246 case HEAD_BCC:
247 if (flags & ACC_RCPT_FROM_HEAD) {
248 /* -t option (see comment above) */
249 DEBUG(5) debugf("hdr->value = %s\n", hdr->value);
250 if (hdr->value) {
251 msg->rcpt_list = addr_list_append_rfc822(msg->rcpt_list, hdr->value, conf.host_name);
252 }
253 }
254 if (hdr->id == HEAD_BCC) {
255 DEBUG(3) debugf("removing 'Bcc' header\n");
256 msg->hdr_list = g_list_remove_link(msg->hdr_list, hdr_node);
257 g_list_free_1(hdr_node);
258 destroy_header(hdr);
259 }
260 break;
261 case HEAD_ENVELOPE_TO:
262 if (flags & ACC_SAVE_ENVELOPE_TO) {
263 DEBUG(3) debugf("creating 'X-Orig-Envelope-To' header\n");
264 msg->hdr_list = g_list_prepend(msg->hdr_list, create_header(HEAD_UNKNOWN,
265 "X-Orig-Envelope-To: %s", hdr->value));
266 }
267 DEBUG(3) debugf("removing 'Envelope-To' header\n");
268 msg->hdr_list = g_list_remove_link(msg->hdr_list, hdr_node);
269 g_list_free_1(hdr_node);
270 destroy_header(hdr);
271 break;
272 case HEAD_RETURN_PATH:
273 if (flags & ACC_MAIL_FROM_HEAD) {
274 /* usually POP3 accept */
275 msg->return_path = create_address_qualified(hdr->value, TRUE, msg->received_host);
276 DEBUG(3) debugf("setting return_path to %s\n", addr_string(msg->return_path));
277 }
278 DEBUG(3) debugf("removing 'Return-Path' header\n");
279 msg->hdr_list = g_list_remove_link(msg->hdr_list, hdr_node);
280 g_list_free_1(hdr_node);
281 destroy_header(hdr);
282 break;
283 default:
284 break; /* make compiler happy */
285 }
286 }
287
288 if (!msg->return_path) {
289 /* TODO: do we still need this as we don't fetch
290 mail anymore? */
291 /* this can happen for pop3 accept only and if no
292 Return-Path: header was given */
293 GList *hdr_list;
294 header *hdr;
295
296 DEBUG(3) debugf("return_path == NULL\n");
297
298 hdr_list = find_header(msg->hdr_list, HEAD_SENDER, NULL);
299 if (!hdr_list) {
300 hdr_list = find_header(msg->hdr_list, HEAD_FROM, NULL);
301 }
302 if (hdr_list) {
303 gchar *addr;
304 hdr = (header *) (g_list_first(hdr_list)->data);
305
306 DEBUG(5) debugf("hdr->value = '%s'\n", hdr->value);
307
308 addr = g_strdup(hdr->value);
309 g_strchomp(addr);
310
311 msg->return_path = create_address_qualified(addr, FALSE, msg->received_host);
312 if (msg->return_path) {
313 DEBUG(3) debugf("setting return_path to %s\n", addr_string(msg->return_path));
314 msg->hdr_list = g_list_append( msg->hdr_list, create_header(HEAD_UNKNOWN, "X-Warning: return path set from %s address\n", hdr->id == HEAD_SENDER ? "Sender:" : "From:"));
315 }
316 g_free(addr);
317 }
318 if (!msg->return_path) {
319 /* no Sender: or From: or
320 create_address_qualified failed */
321 msg->return_path = create_address_qualified("postmaster", TRUE, conf.host_name);
322 DEBUG(3) debugf("setting return_path to %s\n", addr_string(msg->return_path));
323 msg->hdr_list = g_list_append(msg->hdr_list, create_header(HEAD_UNKNOWN, "X-Warning: real return path is unknown\n"));
324 }
325 }
326
327 /* here we should have our recipients, fail if not: */
328 if (!msg->rcpt_list) {
329 logwrite(LOG_WARNING, "no recipients found in message\n");
330 return AERR_NORCPT;
331 }
332
333 if (!has_sender && !has_from) {
334 DEBUG(3) debugf("adding 'From:' header\n");
335 if (msg->full_sender_name) {
336 msg->hdr_list = g_list_append(msg->hdr_list, create_header(HEAD_FROM, "From: \"%s\" <%s@%s>\n", msg->full_sender_name, msg->return_path->local_part, msg->return_path->domain));
337 } else {
338 msg->hdr_list = g_list_append(msg->hdr_list, create_header(HEAD_FROM, "From: <%s@%s>\n", msg->return_path->local_part, msg->return_path->domain));
339 }
340 }
341 if (!has_to_or_cc) {
342 DEBUG(3) debugf("no To: or Cc: header, hence adding `To: undisclosed recipients:;'\n");
343 msg->hdr_list = g_list_append(msg->hdr_list, create_header(HEAD_TO, "To: undisclosed-recipients:;\n"));
344 }
345 if (!has_date) {
346 DEBUG(3) debugf("adding 'Date:' header\n");
347 msg->hdr_list = g_list_append(msg->hdr_list, create_header(HEAD_DATE, "Date: %s\n", rec_timestamp()));
348 }
349 if (!has_id) {
350 DEBUG(3) debugf("adding 'Message-ID:' header\n");
351 msg->hdr_list = g_list_append(msg->hdr_list, create_header(HEAD_MESSAGE_ID, "Message-ID: <%s@%s>\n", msg->uid, conf.host_name));
352 }
353 }
354
355 /* Received header: */
356 /* At this point because we have to know the rcpts for the 'for' part */
357 /* The `for' part will only be used if exactly one rcpt is present. */
358 gchar *for_string = NULL;
359 header *hdr = NULL;
360
361 DEBUG(3) debugf("adding 'Received:' header\n");
362
363 if (g_list_length(msg->rcpt_list) == 1) {
364 address *addr = (address *) (g_list_first(msg->rcpt_list)->data);
365 for_string = g_strdup_printf("\n\tfor %s", addr_string(addr));
366 }
367
368 if (!msg->received_host) {
369 /* received locally */
370 hdr = create_header(HEAD_RECEIVED,
371 "Received: by %s (%s %s, from userid %d)\n\tid %s%s; %s\n",
372 conf.host_name, PACKAGE, VERSION, geteuid(),
373 msg->uid, for_string ? for_string : "", rec_timestamp());
374 } else {
375 /* received from remote */
376 #ifdef ENABLE_IDENT
377 DEBUG(5) debugf("adding 'Received:' header (5)\n");
378 hdr = create_header(HEAD_RECEIVED,
379 "Received: from %s (ident=%s)\n\tby %s with %s (%s %s)\n\tid %s%s; %s\n",
380 msg->received_host, msg->ident ? msg->ident : "unknown",
381 conf.host_name, prot_names[msg->received_prot], PACKAGE,
382 VERSION, msg->uid, for_string ? for_string : "",
383 rec_timestamp());
384 #else
385 hdr = create_header(HEAD_RECEIVED,
386 "Received: from %s\n\tby %s with %s (%s %s)\n\tid %s%s; %s\n",
387 msg->received_host, conf.host_name,
388 prot_names[msg->received_prot], PACKAGE, VERSION,
389 msg->uid, for_string ? for_string : "", rec_timestamp());
390 #endif
391 }
392 msg->hdr_list = g_list_prepend(msg->hdr_list, hdr);
393
394 if (for_string)
395 g_free(for_string);
396
397 return AERR_OK;
398 }
399
400 accept_error
401 accept_message(FILE * in, message * msg, guint flags)
402 {
403 accept_error err;
404
405 err = accept_message_stream(in, msg, flags);
406 if (err == AERR_OK) {
407 err = accept_message_prepare(msg, flags);
408 }
409
410 return err;
411 }