masqmail: 9b93c0a3bd8c src/spool.c

masqmail

view src/spool.c @ 411:9b93c0a3bd8c

Ensure lvals, rvals and components of address strucs are stripped.

author	markus schnalke <meillo@marmaro.de>
date	Wed, 29 Feb 2012 12:06:33 +0100
parents	41958685480d
children	309935f59820

line source

1 /*

2 ** MasqMail

5 **

6 ** This program is free software; you can redistribute it and/or modify

7 ** it under the terms of the GNU General Public License as published by

8 ** the Free Software Foundation; either version 2 of the License, or

9 ** (at your option) any later version.

10 **

11 ** This program is distributed in the hope that it will be useful,

12 ** but WITHOUT ANY WARRANTY; without even the implied warranty of

13 ** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the

14 ** GNU General Public License for more details.

15 **

16 ** You should have received a copy of the GNU General Public License

17 ** along with this program; if not, write to the Free Software

18 ** Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.

19 */

21 #include <sys/stat.h>

23 #include "masqmail.h"

24 #include "dotlock.h"

26 static gint

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

28 {

29 gint p = 0;

30 gint c;

32 while ((c = getc(in)) != '\n' && (c != EOF)) {

33 if (p >= buf_len - 1) {

34 buf[buf_len-1] = '\0';

35 ungetc(c, in);

36 return buf_len;

37 }

38 buf[p++] = c;

39 }

41 if (c == EOF) {

42 return -1;

43 }

44 if ((p > 0) && (buf[p - 1] == '\r'))

45 p--;

46 buf[p++] = '\n';

47 buf[p] = '\0';

49 return p;

50 }

52 static void

53 spool_write_rcpt(FILE *out, address *rcpt)

54 {

55 gchar dlvrd_char = addr_is_delivered(rcpt) ? 'X' : (addr_is_failed(rcpt) ? 'F' : ' ');

57 if (rcpt->local_part[0] != '|') {

58 /* this is a paranoid check, in case it slipped through: */

59 /* if this happens, it is a bug */

60 if (rcpt->domain == NULL) {

61 logwrite(LOG_WARNING, "BUG: null domain for address %s, setting to %s\n", rcpt->local_part, conf.host_name);

62 logwrite(LOG_WARNING, "please report this bug.\n");

63 rcpt->domain = g_strdup(conf.host_name);

64 }

65 fprintf(out, "RT:%c%s\n", dlvrd_char, addr_string(rcpt));

66 } else {

67 fprintf(out, "RT:%c%s\n", dlvrd_char, rcpt->local_part);

68 }

69 }

71 static address*

72 spool_scan_rcpt(gchar *line)

73 {

74 address *rcpt = NULL;

76 if (line[3] != '\0') {

77 if (line[4] != '|') {

78 rcpt = create_address(&(line[4]), TRUE);

79 } else {

80 rcpt = create_address_pipe(&(line[4]));

81 }

82 if (line[3] == 'X') {

83 addr_mark_delivered(rcpt);

84 } else if (line[3] == 'F') {

85 addr_mark_failed(rcpt);

86 }

87 }

88 return rcpt;

89 }

91 gboolean

92 spool_read_data(message *msg)

93 {

94 FILE *in;

95 gchar *spool_file;

97 DEBUG(5) debugf("spool_read_data entered\n");

98 spool_file = g_strdup_printf("%s/input/%s-D", conf.spool_dir, msg->uid);

99 DEBUG(5) debugf("reading data spool file '%s'\n", spool_file);

100 in = fopen(spool_file, "r");

101 if (!in) {

102 logwrite(LOG_ALERT, "could not open spool data file %s: %s\n", spool_file, strerror(errno));

103 return FALSE;

104 }

105

106 char buf[MAX_DATALINE];

107 int len;

108

109 /* msg uid */

110 read_line(in, buf, MAX_DATALINE);

111

112 /* data */

113 msg->data_list = NULL;

114 while ((len = read_line(in, buf, MAX_DATALINE)) > 0) {

115 msg->data_list = g_list_prepend(msg->data_list, g_strdup(buf));

116 }

117 msg->data_list = g_list_reverse(msg->data_list);

118 fclose(in);

119 return TRUE;

120 }

121

122 gboolean

123 spool_read_header(message *msg)

124 {

125 FILE *in;

126 gchar *spool_file;

127

128 /* header spool: */

129 spool_file = g_strdup_printf("%s/input/%s-H", conf.spool_dir, msg->uid);

130 in = fopen(spool_file, "r");

131 if (!in) {

132 logwrite(LOG_ALERT, "could not open spool header file %s: %s\n",

133 spool_file, strerror(errno));

134 return FALSE;

135 }

136

137 header *hdr = NULL;

138 char buf[MAX_DATALINE];

139 int len;

140

141 /* msg uid */

142 read_line(in, buf, MAX_DATALINE);

143

144 /* envelope header */

145 while ((len = read_line(in, buf, MAX_DATALINE)) > 0) {

146 if (buf[0] == '\n') {

147 break;

148 } else if (strncasecmp(buf, "MF:", 3) == 0) {

149 msg->return_path = create_address(&(buf[3]), TRUE);

150 DEBUG(3) debugf("spool_read: MAIL FROM: %s", msg->return_path->address);

151 } else if (strncasecmp(buf, "RT:", 3) == 0) {

152 address *addr;

153 addr = spool_scan_rcpt(buf);

154 if (addr_is_delivered(addr) || addr_is_failed(addr)) {

155 msg->non_rcpt_list = g_list_append(msg->non_rcpt_list, addr);

156 } else {

157 msg->rcpt_list = g_list_append(msg->rcpt_list, addr);

158 }

159 } else if (strncasecmp(buf, "PR:", 3) == 0) {

160 prot_id i;

161 for (i = 0; i < PROT_NUM; i++) {

162 if (strncasecmp(prot_names[i], &(buf[3]), strlen(prot_names[i])) == 0) {

163 break;

164 }

165 }

166 msg->received_prot = i;

167 } else if (strncasecmp(buf, "RH:", 3) == 0) {

168 g_strchomp(buf);

169 msg->received_host = g_strdup(&(buf[3]));

170 } else if (strncasecmp(buf, "ID:", 3) == 0) {

171 g_strchomp(buf);

172 msg->ident = g_strdup(&(buf[3]));

173 } else if (strncasecmp(buf, "DS:", 3) == 0) {

174 msg->data_size = atoi(&(buf[3]));

175 } else if (strncasecmp(buf, "TR:", 3) == 0) {

176 msg->received_time = (time_t) (atoi(&(buf[3])));

177 } else if (strncasecmp(buf, "TW:", 3) == 0) {

178 msg->warned_time = (time_t) (atoi(&(buf[3])));

179 }

180 /* so far ignore other tags */

181 }

182

183 /* mail headers */

184 while ((len = read_line(in, buf, MAX_DATALINE)) > 0) {

185 if (strncasecmp(buf, "HD:", 3) == 0) {

186 DEBUG(6) debugf("spool_read_header(): hdr start\n");

187 hdr = get_header(&(buf[3]));

188 msg->hdr_list = g_list_append(msg->hdr_list, hdr);

189 } else if ((buf[0] == ' ' || buf[0] == '\t') && hdr) {

190 DEBUG(6) debugf("spool_read_header(): hdr continuation\n");

191 char *tmp = hdr->header;

192 /* header continuation */

193 hdr->header = g_strconcat(hdr->header, buf, NULL);

194 hdr->value = hdr->header + (hdr->value - tmp);

195 free(tmp); /* because g_strconcat() allocs and copies */

196 } else {

197 break;

198 }

199 }

200 fclose(in);

201 return TRUE;

202 }

203

204 message*

205 msg_spool_read(gchar *uid)

206 {

207 message *msg;

208 gboolean ok = FALSE;

209

210 msg = create_message();

211 msg->uid = g_strdup(uid);

212

213 DEBUG(4) debugf("msg_spool_read():\n");

214 /* header spool: */

215 ok = spool_read_header(msg);

216 DEBUG(4) debugf(" spool_read_header() returned: %d\n", ok);

217 return msg;

218 }

219

220 /*

221 ** write header. uid and gid should already be set to the

222 ** mail ids. Better call spool_write(msg, FALSE).

223 */

224 static gboolean

225 spool_write_header(message *msg)

226 {

227 GList *node;

228 gchar *spool_file, *tmp_file;

229 FILE *out;

230 gboolean ok = TRUE;

231

232 /* header spool: */

233 tmp_file = g_strdup_printf("%s/input/%d-H.tmp", conf.spool_dir, getpid());

234 DEBUG(4) debugf("tmp_file = %s\n", tmp_file);

235

236 if ((out = fopen(tmp_file, "w"))) {

237 DEBUG(6) debugf("opened tmp_file %s\n", tmp_file);

238

239 fprintf(out, "%s\n", msg->uid);

240 fprintf(out, "MF:%s\n", addr_string(msg->return_path));

241

242 DEBUG(6) debugf("after MF\n");

243 foreach(msg->rcpt_list, node) {

244 address *rcpt = (address *) (node->data);

245 spool_write_rcpt(out, rcpt);

246 }

247 foreach(msg->non_rcpt_list, node) {

248 address *rcpt = (address *) (node->data);

249 spool_write_rcpt(out, rcpt);

250 }

251 DEBUG(6) debugf("after RT\n");

252 fprintf(out, "PR:%s\n", prot_names[msg->received_prot]);

253 if (msg->received_host != NULL)

254 fprintf(out, "RH:%s\n", msg->received_host);

255

256 if (msg->ident != NULL)

257 fprintf(out, "ID:%s\n", msg->ident);

258

259 if (msg->data_size >= 0)

260 fprintf(out, "DS: %d\n", msg->data_size);

261

262 if (msg->received_time > 0)

263 fprintf(out, "TR: %u\n", (int) (msg->received_time));

264

265 if (msg->warned_time > 0)

266 fprintf(out, "TW: %u\n", (int) (msg->warned_time));

267

268 DEBUG(6) debugf("after RH\n");

269 fprintf(out, "\n");

270

271 foreach(msg->hdr_list, node) {

272 header *hdr = (header *) (node->data);

273 fprintf(out, "HD:%s", hdr->header);

274 }

275 if (fflush(out) == EOF)

276 ok = FALSE;

277 else if (fdatasync(fileno(out)) != 0) {

278 if (errno != EINVAL) /* some fs do not support this.. I hope this also means that it is not necessary */

279 ok = FALSE;

280 }

281 fclose(out);

282 if (ok) {

283 spool_file = g_strdup_printf("%s/input/%s-H", conf.spool_dir, msg->uid);

284 DEBUG(4) debugf("spool_file = %s\n", spool_file);

285 ok = (rename(tmp_file, spool_file) != -1);

286 g_free(spool_file);

287 }

288 } else {

289 logwrite(LOG_ALERT, "could not open temporary header spool file '%s': %s\n", tmp_file, strerror(errno));

290 DEBUG(1) debugf("euid = %d, egid = %d\n", geteuid(), getegid());

291 ok = FALSE;

292 }

293

294 g_free(tmp_file);

295

296 return ok;

297 }

298

299 gboolean

300 spool_write(message *msg, gboolean do_write_data)

301 {

302 GList *list;

303 gchar *spool_file, *tmp_file;

304 FILE *out;

305 gboolean ok = TRUE;

306 uid_t saved_uid, saved_gid;

307 /* user can read/write, group can read, others cannot do anything: */

308 mode_t saved_mode = saved_mode = umask(026);

309

310 /* set uid and gid to the mail ids */

311 if (!conf.run_as_user) {

312 set_euidgid(conf.mail_uid, conf.mail_gid, &saved_uid, &saved_gid);

313 }

314

315 /* header spool: */

316 ok = spool_write_header(msg);

317

318 if (ok && do_write_data) {

319 /* data spool: */

320 tmp_file = g_strdup_printf("%s/input/%d-D.tmp", conf.spool_dir, getpid());

321 DEBUG(4) debugf("tmp_file = %s\n", tmp_file);

322

323 if ((out = fopen(tmp_file, "w"))) {

324 fprintf(out, "%s\n", msg->uid);

325 for (list = g_list_first(msg->data_list); list != NULL; list = g_list_next(list)) {

326 fprintf(out, "%s", (gchar *) (list->data));

327 }

328

329 /* possibly paranoid ;-) */

330 if (fflush(out) == EOF) {

331 ok = FALSE;

332 } else if (fdatasync(fileno(out)) != 0) {

333 if (errno != EINVAL) { /* some fs do not support this.. I hope this also means that it is not necessary */

334 ok = FALSE;

335 }

336 }

337 fclose(out);

338 if (ok) {

339 spool_file = g_strdup_printf("%s/input/%s-D", conf.spool_dir, msg->uid);

340 DEBUG(4) debugf("spool_file = %s\n", spool_file);

341 ok = (rename(tmp_file, spool_file) != -1);

342 g_free(spool_file);

343 }

344 } else {

345 logwrite(LOG_ALERT, "could not open temporary data spool file: %s\n",

346 strerror(errno));

347 ok = FALSE;

348 }

349 g_free(tmp_file);

350 }

351

352 /* set uid and gid back */

353 if (!conf.run_as_user) {

354 set_euidgid(saved_uid, saved_gid, NULL, NULL);

355 }

356

357 umask(saved_mode);

358

359 return ok;

360 }

361

362 #define MAX_LOCKAGE 300

363

364 gboolean

365 spool_lock(gchar *uid)

366 {

367 uid_t saved_uid, saved_gid;

368 gchar *hitch_name;

369 gchar *lock_name;

370 gboolean ok = FALSE;

371

372 hitch_name = g_strdup_printf("%s/%s-%d.lock", conf.lock_dir, uid, getpid());

373 lock_name = g_strdup_printf("%s/%s.lock", conf.lock_dir, uid);

374

375 /* set uid and gid to the mail ids */

376 if (!conf.run_as_user) {

377 set_euidgid(conf.mail_uid, conf.mail_gid, &saved_uid, &saved_gid);

378 }

379

380 ok = dot_lock(lock_name, hitch_name);

381 if (!ok)

382 logwrite(LOG_WARNING, "spool file %s is locked\n", uid);

383

384 /* set uid and gid back */

385 if (!conf.run_as_user) {

386 set_euidgid(saved_uid, saved_gid, NULL, NULL);

387 }

388

389 g_free(lock_name);

390 g_free(hitch_name);

391

392 return ok;

393 }

394

395 gboolean

396 spool_unlock(gchar *uid)

397 {

398 uid_t saved_uid, saved_gid;

399 gchar *lock_name;

400

401 /* set uid and gid to the mail ids */

402 if (!conf.run_as_user) {

403 set_euidgid(conf.mail_uid, conf.mail_gid, &saved_uid, &saved_gid);

404 }

405

406 lock_name = g_strdup_printf("%s/%s.lock", conf.lock_dir, uid);

407 dot_unlock(lock_name);

408 g_free(lock_name);

409

410 /* set uid and gid back */

411 if (!conf.run_as_user) {

412 set_euidgid(saved_uid, saved_gid, NULL, NULL);

413 }

414 return TRUE;

415 }

416

417 gboolean

418 spool_delete_all(message *msg)

419 {

420 uid_t saved_uid, saved_gid;

421 gchar *spool_file;

422

423 /* set uid and gid to the mail ids */

424 if (!conf.run_as_user) {

425 set_euidgid(conf.mail_uid, conf.mail_gid, &saved_uid, &saved_gid);

426 }

427

428 /* header spool: */

429 spool_file = g_strdup_printf("%s/input/%s-H", conf.spool_dir, msg->uid);

430 if (unlink(spool_file) != 0) {

431 logwrite(LOG_ALERT, "could not delete spool file %s: %s\n", spool_file, strerror(errno));

432 }

433 g_free(spool_file);

434

435 /* data spool: */

436 spool_file = g_strdup_printf("%s/input/%s-D", conf.spool_dir, msg->uid);

437 if (unlink(spool_file) != 0) {

438 logwrite(LOG_ALERT, "could not delete spool file %s: %s\n", spool_file, strerror(errno));

439 }

440 g_free(spool_file);

441

442 /* set uid and gid back */

443 if (!conf.run_as_user) {

444 set_euidgid(saved_uid, saved_gid, NULL, NULL);

445 }

446 return TRUE;

447 }