masqmail-0.2: 83a182793503 src/spool.c

masqmail-0.2

view src/spool.c @ 82:83a182793503

refactoring

author	meillo@marmaro.de
date	Sat, 19 Jun 2010 12:35:08 +0200
parents	3b344bf57162
children	46f407c0727a

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

155 } else {

156 msg->non_rcpt_list = g_list_append(msg->non_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 hdr = get_header(&(buf[3]));

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

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

188 char *tmp = hdr->header;

189 /* header continuation */

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

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

192 } else {

193 break;

194 }

195 }

196 fclose(in);

197 return TRUE;

198 }

199

200 message*

201 msg_spool_read(gchar * uid, gboolean do_readdata)

202 {

203 message *msg;

204 gboolean ok = FALSE;

205

206 msg = create_message();

207 msg->uid = g_strdup(uid);

208

209 /* header spool: */

210 ok = spool_read_header(msg);

211 if (ok && do_readdata) {

212 /* data spool: */

213 ok = spool_read_data(msg);

214 }

215 return msg;

216 }

217

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

219 mail ids. Better call spool_write(msg, FALSE).

220 */

221 static gboolean

222 spool_write_header(message * msg)

223 {

224 GList *node;

225 gchar *spool_file, *tmp_file;

226 FILE *out;

227 gboolean ok = TRUE;

228

229 /* header spool: */

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

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

232

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

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

235

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

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

238

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

240 foreach(msg->rcpt_list, node) {

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

242 spool_write_rcpt(out, rcpt);

243 }

244 foreach(msg->non_rcpt_list, node) {

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

246 spool_write_rcpt(out, rcpt);

247 }

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

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

250 if (msg->received_host != NULL)

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

252

253 if (msg->ident != NULL)

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

255

256 if (msg->data_size >= 0)

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

258

259 if (msg->received_time > 0)

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

261

262 if (msg->warned_time > 0)

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

264

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

266 fprintf(out, "\n");

267

268 foreach(msg->hdr_list, node) {

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

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

271 }

272 if (fflush(out) == EOF)

273 ok = FALSE;

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

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

276 ok = FALSE;

277 }

278 fclose(out);

279 if (ok) {

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

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

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

283 g_free(spool_file);

284 }

285 } else {

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

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

288 ok = FALSE;

289 }

290

291 g_free(tmp_file);

292

293 return ok;

294 }

295

296 gboolean

297 spool_write(message * msg, gboolean do_write_data)

298 {

299 GList *list;

300 gchar *spool_file, *tmp_file;

301 FILE *out;

302 gboolean ok = TRUE;

303 uid_t saved_uid, saved_gid;

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

305 mode_t saved_mode = saved_mode = umask(026);

306

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

308 if (!conf.run_as_user) {

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

310 }

311

312 /* header spool: */

313 ok = spool_write_header(msg);

314

315 if (ok && do_write_data) {

316 /* data spool: */

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

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

319

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

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

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

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

324 }

325

326 /* possibly paranoid ;-) */

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

328 ok = FALSE;

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

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

331 ok = FALSE;

332 }

333 }

334 fclose(out);

335 if (ok) {

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

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

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

339 g_free(spool_file);

340 }

341 } else {

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

343 strerror(errno));

344 ok = FALSE;

345 }

346 g_free(tmp_file);

347 }

348

349 /* set uid and gid back */

350 if (!conf.run_as_user) {

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

352 }

353

354 umask(saved_mode);

355

356 return ok;

357 }

358

359 #define MAX_LOCKAGE 300

360

361 gboolean

362 spool_lock(gchar * uid)

363 {

364 uid_t saved_uid, saved_gid;

365 gchar *hitch_name;

366 gchar *lock_name;

367 gboolean ok = FALSE;

368

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

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

371

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

373 if (!conf.run_as_user) {

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

375 }

376

377 ok = dot_lock(lock_name, hitch_name);

378 if (!ok)

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

380

381 /* set uid and gid back */

382 if (!conf.run_as_user) {

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

384 }

385

386 g_free(lock_name);

387 g_free(hitch_name);

388

389 return ok;

390 }

391

392 gboolean

393 spool_unlock(gchar * uid)

394 {

395 uid_t saved_uid, saved_gid;

396 gchar *lock_name;

397

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

399 if (!conf.run_as_user) {

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

401 }

402

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

404 dot_unlock(lock_name);

405 g_free(lock_name);

406

407 /* set uid and gid back */

408 if (!conf.run_as_user) {

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

410 }

411 return TRUE;

412 }

413

414 gboolean

415 spool_delete_all(message * msg)

416 {

417 uid_t saved_uid, saved_gid;

418 gchar *spool_file;

419

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

421 if (!conf.run_as_user) {

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

423 }

424

425 /* header spool: */

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

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

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

429 }

430 g_free(spool_file);

431

432 /* data spool: */

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

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

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

436 }

437 g_free(spool_file);

438

439 /* set uid and gid back */

440 if (!conf.run_as_user) {

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

442 }

443 return TRUE;

444 }