masqmail
view src/accept.c @ 360:7a8d706f0ff1
Added explanation about --enable-ident
| author | markus schnalke <meillo@marmaro.de> |
|---|---|
| date | Sun, 04 Sep 2011 17:41:02 +0200 |
| parents | d5ce2ba71e7b |
| children | 9d49dffc3070 |
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 /* 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 };
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 }
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;
51 if ((ret = strcasecmp(addr1->domain, addr2->domain)) == 0) {
52 return strcmp(addr1->local_part, addr2->local_part);
53 }
54 return ret;
55 }
57 /* accept message from anywhere.
58 A message from local is indicated by msg->recieved_host == NULL
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 */
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;
73 line = g_malloc(line_size);
74 line[0] = '\0';
76 while (TRUE) {
77 int len = read_sockline1(in, &line, &line_size, 5 * 60, READSOCKL_CVT_CRLF);
79 line1 = line;
81 if ((line[0] == '.') && (!(flags & ACC_DOT_IGNORE))) {
82 if (line[1] == '\n') {
83 g_free(line);
84 break;
85 }
86 line1++;
87 }
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;
103 } else if (len == -1) {
104 g_free(line);
105 return AERR_EOF;
107 } else if (len == -2) {
108 /* should not happen any more */
109 g_free(line);
110 return AERR_OVERFLOW;
112 } else if (len == -3) {
113 g_free(line);
114 return AERR_TIMEOUT;
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;
122 }
124 if (in_headers) {
126 /* some pop servers send the 'From ' line, skip it: */
127 if (!msg->hdr_list && strncmp(line1, "From ", 5) == 0) {
128 continue;
129 }
131 if (line1[0] == ' ' || line1[0] == '\t') {
132 /* continuation of 'folded' header: */
133 if (hdr) {
134 char* cp;
135 cp = g_strconcat(hdr->header, line1, NULL);
136 hdr->value = cp + (hdr->value - hdr->header);
137 free(hdr->header);
138 hdr->header = cp;
139 }
141 } else if (line1[0] == '\n') {
142 /* an empty line marks end of headers */
143 in_headers = FALSE;
144 } else {
145 /* in all other cases we expect another header */
146 if ((hdr = get_header(line1))) {
147 msg->hdr_list = g_list_append(msg->hdr_list, hdr);
148 } else {
149 /* if get_header() returns NULL, no header was recognized,
150 so this seems to be the first data line of a broken mailer
151 which does not send an empty line after the headers */
152 in_headers = FALSE;
153 msg->data_list = g_list_prepend(msg->data_list, g_strdup(line1));
154 }
155 }
156 } else {
157 /* message body */
158 msg->data_list = g_list_prepend(msg->data_list, g_strdup(line1));
159 data_size += strlen(line1);
160 line_cnt++;
161 }
163 if (conf.max_msg_size && (data_size > conf.max_msg_size)) {
164 DEBUG(4) debugf("accept_message_stream(): "
165 "received %d bytes (conf.max_msg_size=%d)\n",
166 data_size, conf.max_msg_size);
167 return AERR_SIZE;
168 }
170 }
172 DEBUG(4) debugf("received %d lines of data (%d bytes)\n", line_cnt, data_size);
174 if (!msg->data_list) {
175 /* make sure data list is not NULL: */
176 msg->data_list = g_list_append(NULL, g_strdup(""));
177 }
178 msg->data_list = g_list_reverse(msg->data_list);
180 /* we get here after we succesfully received the mail data */
182 msg->data_size = data_size;
183 msg->received_time = time(NULL);
185 return AERR_OK;
186 }
188 accept_error
189 accept_message_prepare(message * msg, guint flags)
190 {
191 struct passwd *passwd = NULL;
192 time_t rec_time = time(NULL);
194 DEBUG(5) debugf("accept_message_prepare()\n");
196 /* create unique message id */
197 msg->uid = g_malloc(14);
198 string_base62(msg->uid, rec_time, 6);
199 msg->uid[6] = '-';
200 string_base62(msg->uid + 7, getpid(), 3);
201 msg->uid[10] = '-';
202 string_base62(msg->uid + 11, msg->transfer_id, 2);
203 msg->uid[13] = '\0';
205 /* if local, get password entry and set return path if missing */
206 if (!msg->received_host) {
207 passwd = g_memdup(getpwuid(geteuid()), sizeof(struct passwd));
208 msg->ident = g_strdup(passwd->pw_name);
209 if (!msg->return_path) {
210 gchar *path = g_strdup_printf("<%s@%s>", passwd->pw_name, conf.host_name);
211 DEBUG(3) debugf("setting return_path for local accept: %s\n", path);
212 msg->return_path = create_address(path, TRUE);
213 g_free(path);
214 }
215 }
217 /* scan headers */
218 {
219 gboolean has_id = FALSE;
220 gboolean has_date = FALSE;
221 gboolean has_sender = FALSE;
222 gboolean has_from = FALSE;
223 gboolean has_to_or_cc = FALSE;
224 GList *hdr_node, *hdr_node_next;
225 header *hdr;
227 for (hdr_node = g_list_first(msg->hdr_list);
228 hdr_node;
229 hdr_node = hdr_node_next) {
230 hdr_node_next = g_list_next(hdr_node);
231 hdr = ((header *) (hdr_node->data));
232 DEBUG(5) debugf("scanning headers: %s", hdr->header);
233 switch (hdr->id) {
234 case HEAD_MESSAGE_ID:
235 has_id = TRUE;
236 break;
237 case HEAD_DATE:
238 has_date = TRUE;
239 break;
240 case HEAD_FROM:
241 has_from = TRUE;
242 break;
243 case HEAD_SENDER:
244 has_sender = TRUE;
245 break;
246 case HEAD_TO:
247 case HEAD_CC:
248 has_to_or_cc = TRUE;
249 /* fall through */
250 case HEAD_BCC:
251 if (flags & ACC_RCPT_FROM_HEAD) {
252 /* -t option (see comment above) */
253 DEBUG(5) debugf("hdr->value = %s\n", hdr->value);
254 if (hdr->value) {
255 msg->rcpt_list = addr_list_append_rfc822(msg->rcpt_list, hdr->value, conf.host_name);
256 }
257 }
258 if (hdr->id == HEAD_BCC) {
259 DEBUG(3) debugf("removing 'Bcc' header\n");
260 msg->hdr_list = g_list_remove_link(msg->hdr_list, hdr_node);
261 g_list_free_1(hdr_node);
262 destroy_header(hdr);
263 }
264 break;
265 case HEAD_ENVELOPE_TO:
266 if (flags & ACC_SAVE_ENVELOPE_TO) {
267 DEBUG(3) debugf("creating 'X-Orig-Envelope-To' header\n");
268 msg->hdr_list = g_list_prepend(msg->hdr_list, create_header(HEAD_UNKNOWN,
269 "X-Orig-Envelope-To: %s", hdr->value));
270 }
271 DEBUG(3) debugf("removing 'Envelope-To' header\n");
272 msg->hdr_list = g_list_remove_link(msg->hdr_list, hdr_node);
273 g_list_free_1(hdr_node);
274 destroy_header(hdr);
275 break;
276 case HEAD_RETURN_PATH:
277 if (flags & ACC_MAIL_FROM_HEAD) {
278 /* usually POP3 accept */
279 msg->return_path = create_address_qualified(hdr->value, TRUE, msg->received_host);
280 DEBUG(3) debugf("setting return_path to %s\n", addr_string(msg->return_path));
281 }
282 DEBUG(3) debugf("removing 'Return-Path' header\n");
283 msg->hdr_list = g_list_remove_link(msg->hdr_list, hdr_node);
284 g_list_free_1(hdr_node);
285 destroy_header(hdr);
286 break;
287 default:
288 break; /* make compiler happy */
289 }
290 }
292 if (!msg->return_path) {
293 /* TODO: do we still need this as we don't fetch
294 mail anymore? */
295 /* this can happen for pop3 accept only and if no
296 Return-Path: header was given */
297 GList *hdr_list;
298 header *hdr;
300 DEBUG(3) debugf("return_path == NULL\n");
302 hdr_list = find_header(msg->hdr_list, HEAD_SENDER, NULL);
303 if (!hdr_list) {
304 hdr_list = find_header(msg->hdr_list, HEAD_FROM, NULL);
305 }
306 if (hdr_list) {
307 gchar *addr;
308 hdr = (header *) (g_list_first(hdr_list)->data);
310 DEBUG(5) debugf("hdr->value = '%s'\n", hdr->value);
312 addr = g_strdup(hdr->value);
313 g_strchomp(addr);
315 msg->return_path = create_address_qualified(addr, FALSE, msg->received_host);
316 if (msg->return_path) {
317 DEBUG(3) debugf("setting return_path to %s\n", addr_string(msg->return_path));
318 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:"));
319 }
320 g_free(addr);
321 }
322 if (!msg->return_path) {
323 /* no Sender: or From: or
324 create_address_qualified failed */
325 msg->return_path = create_address_qualified("postmaster", TRUE, conf.host_name);
326 DEBUG(3) debugf("setting return_path to %s\n", addr_string(msg->return_path));
327 msg->hdr_list = g_list_append(msg->hdr_list, create_header(HEAD_UNKNOWN, "X-Warning: real return path is unknown\n"));
328 }
329 }
331 /* here we should have our recipients, fail if not: */
332 if (!msg->rcpt_list) {
333 logwrite(LOG_WARNING, "no recipients found in message\n");
334 return AERR_NORCPT;
335 }
337 if (!has_sender && !has_from) {
338 DEBUG(3) debugf("adding 'From:' header\n");
339 if (msg->full_sender_name) {
340 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));
341 } else {
342 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));
343 }
344 }
345 if (!has_to_or_cc) {
346 DEBUG(3) debugf("no To: or Cc: header, hence adding `To: undisclosed recipients:;'\n");
347 msg->hdr_list = g_list_append(msg->hdr_list, create_header(HEAD_TO, "To: undisclosed-recipients:;\n"));
348 }
349 if (!has_date) {
350 DEBUG(3) debugf("adding 'Date:' header\n");
351 msg->hdr_list = g_list_append(msg->hdr_list, create_header(HEAD_DATE, "Date: %s\n", rec_timestamp()));
352 }
353 if (!has_id) {
354 DEBUG(3) debugf("adding 'Message-ID:' header\n");
355 msg->hdr_list = g_list_append(msg->hdr_list, create_header(HEAD_MESSAGE_ID, "Message-ID: <%s@%s>\n", msg->uid, conf.host_name));
356 }
357 }
359 /* Received header: */
360 /* At this point because we have to know the rcpts for the 'for' part */
361 /* The `for' part will only be used if exactly one rcpt is present. */
362 gchar *for_string = NULL;
363 header *hdr = NULL;
365 DEBUG(3) debugf("adding 'Received:' header\n");
367 if (g_list_length(msg->rcpt_list) == 1) {
368 address *addr = (address *) (g_list_first(msg->rcpt_list)->data);
369 for_string = g_strdup_printf("\n\tfor %s", addr_string(addr));
370 }
372 if (!msg->received_host) {
373 /* received locally */
374 hdr = create_header(HEAD_RECEIVED,
375 "Received: by %s (%s %s, from userid %d)\n\tid %s%s; %s\n",
376 conf.host_name, PACKAGE, VERSION, geteuid(),
377 msg->uid, for_string ? for_string : "", rec_timestamp());
378 } else {
379 /* received from remote */
380 #ifdef ENABLE_IDENT
381 DEBUG(5) debugf("adding 'Received:' header (5)\n");
382 hdr = create_header(HEAD_RECEIVED,
383 "Received: from %s (ident=%s)\n\tby %s with %s (%s %s)\n\tid %s%s; %s\n",
384 msg->received_host, msg->ident ? msg->ident : "unknown",
385 conf.host_name, prot_names[msg->received_prot], PACKAGE,
386 VERSION, msg->uid, for_string ? for_string : "",
387 rec_timestamp());
388 #else
389 hdr = create_header(HEAD_RECEIVED,
390 "Received: from %s\n\tby %s with %s (%s %s)\n\tid %s%s; %s\n",
391 msg->received_host, conf.host_name,
392 prot_names[msg->received_prot], PACKAGE, VERSION,
393 msg->uid, for_string ? for_string : "", rec_timestamp());
394 #endif
395 }
396 msg->hdr_list = g_list_prepend(msg->hdr_list, hdr);
398 if (for_string)
399 g_free(for_string);
401 return AERR_OK;
402 }
404 accept_error
405 accept_message(FILE * in, message * msg, guint flags)
406 {
407 accept_error err;
409 err = accept_message_stream(in, msg, flags);
410 if (err == AERR_OK) {
411 err = accept_message_prepare(msg, flags);
412 }
414 return err;
415 }