masqmail: 92340177150d src/spool.c

masqmail

view src/spool.c @ 358:92340177150d

Eventually switched the default group from `trusted' to `mail' All systems I run have a group `mail' but no group `trusted'. Also changed the uid/gid to the common values 8/12.

author	markus schnalke <meillo@marmaro.de>
date	Sun, 04 Sep 2011 12:19:41 +0200
parents	d04894d0fc64
children	41958685480d

line source

1 /* MasqMail

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 <sys/stat.h>

22 #include "masqmail.h"

23 #include "dotlock.h"

25 static gint

26 read_line(FILE * in, gchar * buf, gint buf_len)

27 {

28 gint p = 0;

29 gint c;

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 }

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';

48 return p;

49 }

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' : ' ');

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 }

70 static address*

71 spool_scan_rcpt(gchar * line)

72 {

73 address *rcpt = NULL;

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 }

90 gboolean

91 spool_read_data(message * msg)

92 {

93 FILE *in;

94 gchar *spool_file;

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 }