masqmail

view src/spool.c @ 366:41958685480d

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Switched to `type *name' style Andrew Koenig's ``C Traps and Pitfalls'' (Ch.2.1) convinced me that it is best to go with the way C had been designed. The ``declaration reflects use'' concept conflicts with a ``type* name'' notation. Hence I switched.
author markus schnalke <meillo@marmaro.de>
date Thu, 22 Sep 2011 15:07:40 +0200
parents b45dc53f2829
children b27f66555ba8
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 <sys/stat.h>
21
22 #include "masqmail.h"
23 #include "dotlock.h"
24
25 static gint
26 read_line(FILE *in, gchar *buf, gint buf_len)
27 {
28 gint p = 0;
29 gint c;
30
31 while ((c = getc(in)) != '\n' && (c != EOF)) {
32 if (p >= buf_len - 1) {
33 buf[buf_len-1] = '\0';
34 ungetc(c, in);
35 return buf_len;
36 }
37 buf[p++] = c;
38 }
39
40 if (c == EOF) {
41 return -1;
42 }
43 if ((p > 0) && (buf[p - 1] == '\r'))
44 p--;
45 buf[p++] = '\n';
46 buf[p] = '\0';
47
48 return p;
49 }
50
51 static void
52 spool_write_rcpt(FILE *out, address *rcpt)
53 {
54 gchar dlvrd_char = addr_is_delivered(rcpt) ? 'X' : (addr_is_failed(rcpt) ? 'F' : ' ');
55
56 if (rcpt->local_part[0] != '|') {
57 /* this is a paranoid check, in case it slipped through: */
58 /* if this happens, it is a bug */
59 if (rcpt->domain == NULL) {
60 logwrite(LOG_WARNING, "BUG: null domain for address %s, setting to %s\n", rcpt->local_part, conf.host_name);
61 logwrite(LOG_WARNING, "please report this bug.\n");
62 rcpt->domain = g_strdup(conf.host_name);
63 }
64 fprintf(out, "RT:%c%s\n", dlvrd_char, addr_string(rcpt));
65 } else {
66 fprintf(out, "RT:%c%s\n", dlvrd_char, rcpt->local_part);
67 }
68 }
69
70 static address*
71 spool_scan_rcpt(gchar *line)
72 {
73 address *rcpt = NULL;
74
75 if (line[3] != '\0') {
76 if (line[4] != '|') {
77 rcpt = create_address(&(line[4]), TRUE);
78 } else {
79 rcpt = create_address_pipe(&(line[4]));
80 }
81 if (line[3] == 'X') {
82 addr_mark_delivered(rcpt);
83 } else if (line[3] == 'F') {
84 addr_mark_failed(rcpt);
85 }
86 }
87 return rcpt;
88 }
89
90 gboolean
91 spool_read_data(message *msg)
92 {
93 FILE *in;
94 gchar *spool_file;
95
96 DEBUG(5) debugf("spool_read_data entered\n");
97 spool_file = g_strdup_printf("%s/input/%s-D", conf.spool_dir, msg->uid);
98 DEBUG(5) debugf("reading data spool file '%s'\n", spool_file);
99 in = fopen(spool_file, "r");
100 if (!in) {
101 logwrite(LOG_ALERT, "could not open spool data file %s: %s\n", spool_file, strerror(errno));
102 return FALSE;
103 }
104
105 char buf[MAX_DATALINE];
106 int len;
107
108 /* msg uid */
109 read_line(in, buf, MAX_DATALINE);
110
111 /* data */
112 msg->data_list = NULL;
113 while ((len = read_line(in, buf, MAX_DATALINE)) > 0) {
114 msg->data_list = g_list_prepend(msg->data_list, g_strdup(buf));
115 }
116 msg->data_list = g_list_reverse(msg->data_list);
117 fclose(in);
118 return TRUE;
119 }
120
121 gboolean
122 spool_read_header(message *msg)
123 {
124 FILE *in;
125 gchar *spool_file;
126
127 /* header spool: */
128 spool_file = g_strdup_printf("%s/input/%s-H", conf.spool_dir, msg->uid);
129 in = fopen(spool_file, "r");
130 if (!in) {
131 logwrite(LOG_ALERT, "could not open spool header file %s: %s\n",
132 spool_file, strerror(errno));
133 return FALSE;
134 }
135
136 header *hdr = NULL;
137 char buf[MAX_DATALINE];
138 int len;
139
140 /* msg uid */
141 read_line(in, buf, MAX_DATALINE);
142
143 /* envelope header */
144 while ((len = read_line(in, buf, MAX_DATALINE)) > 0) {
145 if (buf[0] == '\n') {
146 break;
147 } else if (strncasecmp(buf, "MF:", 3) == 0) {
148 msg->return_path = create_address(&(buf[3]), TRUE);
149 DEBUG(3) debugf("spool_read: MAIL FROM: %s", msg->return_path->address);
150 } else if (strncasecmp(buf, "RT:", 3) == 0) {
151 address *addr;
152 addr = spool_scan_rcpt(buf);
153 if (addr_is_delivered(addr) || addr_is_failed(addr)) {
154 msg->non_rcpt_list = g_list_append(msg->non_rcpt_list, addr);
155 } else {
156 msg->rcpt_list = g_list_append(msg->rcpt_list, addr);
157 }
158 } else if (strncasecmp(buf, "PR:", 3) == 0) {
159 prot_id i;
160 for (i = 0; i < PROT_NUM; i++) {
161 if (strncasecmp(prot_names[i], &(buf[3]), strlen(prot_names[i])) == 0) {
162 break;
163 }
164 }
165 msg->received_prot = i;
166 } else if (strncasecmp(buf, "RH:", 3) == 0) {
167 g_strchomp(buf);
168 msg->received_host = g_strdup(&(buf[3]));
169 } else if (strncasecmp(buf, "ID:", 3) == 0) {
170 g_strchomp(buf);
171 msg->ident = g_strdup(&(buf[3]));
172 } else if (strncasecmp(buf, "DS:", 3) == 0) {
173 msg->data_size = atoi(&(buf[3]));
174 } else if (strncasecmp(buf, "TR:", 3) == 0) {
175 msg->received_time = (time_t) (atoi(&(buf[3])));
176 } else if (strncasecmp(buf, "TW:", 3) == 0) {
177 msg->warned_time = (time_t) (atoi(&(buf[3])));
178 }
179 /* so far ignore other tags */
180 }
181
182 /* mail headers */
183 while ((len = read_line(in, buf, MAX_DATALINE)) > 0) {
184 if (strncasecmp(buf, "HD:", 3) == 0) {
185 DEBUG(6) debugf("spool_read_header(): hdr start\n");
186 hdr = get_header(&(buf[3]));
187 msg->hdr_list = g_list_append(msg->hdr_list, hdr);
188 } else if ((buf[0] == ' ' || buf[0] == '\t') && hdr) {
189 DEBUG(6) debugf("spool_read_header(): hdr continuation\n");
190 char *tmp = hdr->header;
191 /* header continuation */
192 hdr->header = g_strconcat(hdr->header, buf, NULL);
193 hdr->value = hdr->header + (hdr->value - tmp);
194 free(tmp); /* because g_strconcat() allocs and copies */
195 } else {
196 break;
197 }
198 }
199 fclose(in);
200 return TRUE;
201 }
202
203 message*
204 msg_spool_read(gchar *uid)
205 {
206 message *msg;
207 gboolean ok = FALSE;
208
209 msg = create_message();
210 msg->uid = g_strdup(uid);
211
212 DEBUG(4) debugf("msg_spool_read():\n");
213 /* header spool: */
214 ok = spool_read_header(msg);
215 DEBUG(4) debugf(" spool_read_header() returned: %d\n", ok);
216 return msg;
217 }
218
219 /* write header. uid and gid should already be set to the
220 mail ids. Better call spool_write(msg, FALSE).
221 */
222 static gboolean
223 spool_write_header(message *msg)
224 {
225 GList *node;
226 gchar *spool_file, *tmp_file;
227 FILE *out;
228 gboolean ok = TRUE;
229
230 /* header spool: */
231 tmp_file = g_strdup_printf("%s/input/%d-H.tmp", conf.spool_dir, getpid());
232 DEBUG(4) debugf("tmp_file = %s\n", tmp_file);
233
234 if ((out = fopen(tmp_file, "w"))) {
235 DEBUG(6) debugf("opened tmp_file %s\n", tmp_file);
236
237 fprintf(out, "%s\n", msg->uid);
238 fprintf(out, "MF:%s\n", addr_string(msg->return_path));
239
240 DEBUG(6) debugf("after MF\n");
241 foreach(msg->rcpt_list, node) {
242 address *rcpt = (address *) (node->data);
243 spool_write_rcpt(out, rcpt);
244 }
245 foreach(msg->non_rcpt_list, node) {
246 address *rcpt = (address *) (node->data);
247 spool_write_rcpt(out, rcpt);
248 }
249 DEBUG(6) debugf("after RT\n");
250 fprintf(out, "PR:%s\n", prot_names[msg->received_prot]);
251 if (msg->received_host != NULL)
252 fprintf(out, "RH:%s\n", msg->received_host);
253
254 if (msg->ident != NULL)
255 fprintf(out, "ID:%s\n", msg->ident);
256
257 if (msg->data_size >= 0)
258 fprintf(out, "DS: %d\n", msg->data_size);
259
260 if (msg->received_time > 0)
261 fprintf(out, "TR: %u\n", (int) (msg->received_time));
262
263 if (msg->warned_time > 0)
264 fprintf(out, "TW: %u\n", (int) (msg->warned_time));
265
266 DEBUG(6) debugf("after RH\n");
267 fprintf(out, "\n");
268
269 foreach(msg->hdr_list, node) {
270 header *hdr = (header *) (node->data);
271 fprintf(out, "HD:%s", hdr->header);
272 }
273 if (fflush(out) == EOF)
274 ok = FALSE;
275 else if (fdatasync(fileno(out)) != 0) {
276 if (errno != EINVAL) /* some fs do not support this.. I hope this also means that it is not necessary */
277 ok = FALSE;
278 }
279 fclose(out);
280 if (ok) {
281 spool_file = g_strdup_printf("%s/input/%s-H", conf.spool_dir, msg->uid);
282 DEBUG(4) debugf("spool_file = %s\n", spool_file);
283 ok = (rename(tmp_file, spool_file) != -1);
284 g_free(spool_file);
285 }
286 } else {
287 logwrite(LOG_ALERT, "could not open temporary header spool file '%s': %s\n", tmp_file, strerror(errno));
288 DEBUG(1) debugf("euid = %d, egid = %d\n", geteuid(), getegid());
289 ok = FALSE;
290 }
291
292 g_free(tmp_file);
293
294 return ok;
295 }
296
297 gboolean
298 spool_write(message *msg, gboolean do_write_data)
299 {
300 GList *list;
301 gchar *spool_file, *tmp_file;
302 FILE *out;
303 gboolean ok = TRUE;
304 uid_t saved_uid, saved_gid;
305 /* user can read/write, group can read, others cannot do anything: */
306 mode_t saved_mode = saved_mode = umask(026);
307
308 /* set uid and gid to the mail ids */
309 if (!conf.run_as_user) {
310 set_euidgid(conf.mail_uid, conf.mail_gid, &saved_uid, &saved_gid);
311 }
312
313 /* header spool: */
314 ok = spool_write_header(msg);
315
316 if (ok && do_write_data) {
317 /* data spool: */
318 tmp_file = g_strdup_printf("%s/input/%d-D.tmp", conf.spool_dir, getpid());
319 DEBUG(4) debugf("tmp_file = %s\n", tmp_file);
320
321 if ((out = fopen(tmp_file, "w"))) {
322 fprintf(out, "%s\n", msg->uid);
323 for (list = g_list_first(msg->data_list); list != NULL; list = g_list_next(list)) {
324 fprintf(out, "%s", (gchar *) (list->data));
325 }
326
327 /* possibly paranoid ;-) */
328 if (fflush(out) == EOF) {
329 ok = FALSE;
330 } else if (fdatasync(fileno(out)) != 0) {
331 if (errno != EINVAL) { /* some fs do not support this.. I hope this also means that it is not necessary */
332 ok = FALSE;
333 }
334 }
335 fclose(out);
336 if (ok) {
337 spool_file = g_strdup_printf("%s/input/%s-D", conf.spool_dir, msg->uid);
338 DEBUG(4) debugf("spool_file = %s\n", spool_file);
339 ok = (rename(tmp_file, spool_file) != -1);
340 g_free(spool_file);
341 }
342 } else {
343 logwrite(LOG_ALERT, "could not open temporary data spool file: %s\n",
344 strerror(errno));
345 ok = FALSE;
346 }
347 g_free(tmp_file);
348 }
349
350 /* set uid and gid back */
351 if (!conf.run_as_user) {
352 set_euidgid(saved_uid, saved_gid, NULL, NULL);
353 }
354
355 umask(saved_mode);
356
357 return ok;
358 }
359
360 #define MAX_LOCKAGE 300
361
362 gboolean
363 spool_lock(gchar *uid)
364 {
365 uid_t saved_uid, saved_gid;
366 gchar *hitch_name;
367 gchar *lock_name;
368 gboolean ok = FALSE;
369
370 hitch_name = g_strdup_printf("%s/%s-%d.lock", conf.lock_dir, uid, getpid());
371 lock_name = g_strdup_printf("%s/%s.lock", conf.lock_dir, uid);
372
373 /* set uid and gid to the mail ids */
374 if (!conf.run_as_user) {
375 set_euidgid(conf.mail_uid, conf.mail_gid, &saved_uid, &saved_gid);
376 }
377
378 ok = dot_lock(lock_name, hitch_name);
379 if (!ok)
380 logwrite(LOG_WARNING, "spool file %s is locked\n", uid);
381
382 /* set uid and gid back */
383 if (!conf.run_as_user) {
384 set_euidgid(saved_uid, saved_gid, NULL, NULL);
385 }
386
387 g_free(lock_name);
388 g_free(hitch_name);
389
390 return ok;
391 }
392
393 gboolean
394 spool_unlock(gchar *uid)
395 {
396 uid_t saved_uid, saved_gid;
397 gchar *lock_name;
398
399 /* set uid and gid to the mail ids */
400 if (!conf.run_as_user) {
401 set_euidgid(conf.mail_uid, conf.mail_gid, &saved_uid, &saved_gid);
402 }
403
404 lock_name = g_strdup_printf("%s/%s.lock", conf.lock_dir, uid);
405 dot_unlock(lock_name);
406 g_free(lock_name);
407
408 /* set uid and gid back */
409 if (!conf.run_as_user) {
410 set_euidgid(saved_uid, saved_gid, NULL, NULL);
411 }
412 return TRUE;
413 }
414
415 gboolean
416 spool_delete_all(message *msg)
417 {
418 uid_t saved_uid, saved_gid;
419 gchar *spool_file;
420
421 /* set uid and gid to the mail ids */
422 if (!conf.run_as_user) {
423 set_euidgid(conf.mail_uid, conf.mail_gid, &saved_uid, &saved_gid);
424 }
425
426 /* header spool: */
427 spool_file = g_strdup_printf("%s/input/%s-H", conf.spool_dir, msg->uid);
428 if (unlink(spool_file) != 0) {
429 logwrite(LOG_ALERT, "could not delete spool file %s: %s\n", spool_file, strerror(errno));
430 }
431 g_free(spool_file);
432
433 /* data spool: */
434 spool_file = g_strdup_printf("%s/input/%s-D", conf.spool_dir, msg->uid);
435 if (unlink(spool_file) != 0) {
436 logwrite(LOG_ALERT, "could not delete spool file %s: %s\n", spool_file, strerror(errno));
437 }
438 g_free(spool_file);
439
440 /* set uid and gid back */
441 if (!conf.run_as_user) {
442 set_euidgid(saved_uid, saved_gid, NULL, NULL);
443 }
444 return TRUE;
445 }