masqmail: cab46cefa4ce src/accept.c

masqmail

view src/accept.c @ 227:cab46cefa4ce

renamed contrib/ to admin/ because the contents are for system admins and possibly for advanced users too

author	meillo@marmaro.de
date	Fri, 23 Jul 2010 11:49:44 +0200
parents	89f951be358f
children	409552c5647f

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 "masqmail.h"

21 #include "readsock.h"

23 gchar *prot_names[] = {

24 "local",

25 "bsmtp",

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 else

54 return ret;

55 }

57 /* accept message from anywhere.

58 A locally originating message is indicated by msg->recieved_host == NULL

60 The -t option:

61 The ACC_RCPT_FROM_HEAD flag adds the recipients found in To/Cc/Bcc

62 headers to the recipients list.

63 The ACC_DEL_RCPTS flag makes only sense if the ACC_RCPT_FROM_HEAD

64 flag is given too. With ACC_DEL_RCPTS the recipients given on the

65 command line are removed from the ones given in headers.

66 */

68 accept_error

69 accept_message_stream(FILE * in, message * msg, guint flags)

70 {

71 gchar *line, *line1;

72 int line_size = MAX_DATALINE;

73 gboolean in_headers = TRUE;

74 header *hdr = NULL;

75 gint line_cnt = 0, data_size = 0;

77 line = g_malloc(line_size);

78 line[0] = '\0';

80 while (TRUE) {

81 int len = read_sockline1(in, &line, &line_size, 5 * 60, READSOCKL_CVT_CRLF);

83 line1 = line;

85 if ((line[0] == '.') && (!(flags & ACC_DOT_IGNORE))) {

86 if (line[1] == '\n') {

87 g_free(line);

88 break;

89 }

90 line1++;

91 }

93 if (len <= 0) {

94 if ((len == -1) && (flags & (ACC_DOT_IGNORE | ACC_NODOT_RELAX))) {

95 /* we got an EOF, and the last line was not terminated by a CR */

96 gint len1 = strlen(line1);

97 if (len1 > 0) { /* == 0 is 'normal' (EOF after a CR) */

98 if (line1[len1 - 1] != '\n') { /* some mail clients allow unterminated lines */

99 line1[len1] = '\n';

100 line1[len1 + 1] = '\0';

101 msg->data_list = g_list_prepend(msg->data_list, g_strdup(line1));

102 data_size += strlen(line1);

103 line_cnt++;

104 }

105 }

106 break;

107 } else {

108 g_free(line);

109 if (len == -1) {

110 return AERR_EOF;

111 } else if (len == -2) {

112 /* should not happen any more */

113 return AERR_OVERFLOW;

114 } else if (len == -3) {

115 return AERR_TIMEOUT;

116 } else {

117 /* does not happen */

118 DEBUG(5) debugf("read_sockline returned %d\n", len);

119 return AERR_UNKNOWN;

120 }

121 }

122 } else {

123 if (in_headers) {

124

125 /* some pop servers send the 'From ' line, skip it: */

126 if (msg->hdr_list == NULL)

127 if (strncmp(line1, "From ", 5) == 0)

128 continue;

129

130 if (line1[0] == ' ' || line1[0] == '\t') {

131 /* continuation of 'folded' header: */

132 if (hdr) {

133 hdr->header = g_strconcat(hdr->header, line1, NULL);

134 }

135

136 } else if (line1[0] == '\n') {

137 /* an empty line marks end of headers */

138 in_headers = FALSE;

139 } else {

140 /* in all other cases we expect another header */

141 if ((hdr = get_header(line1)))

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

143 else {

144 /* if get_header() returns NULL, no header was recognized,

145 so this seems to be the first data line of a broken mailer

146 which does not send an empty line after the headers */

147 in_headers = FALSE;

148 msg->data_list = g_list_prepend(msg->data_list, g_strdup(line1));

149 }

150 }

151 } else {

152 msg->data_list = g_list_prepend(msg->data_list, g_strdup(line1));

153 data_size += strlen(line1);

154 line_cnt++;

155 }

156 }

157 if (conf.max_msg_size && (data_size > conf.max_msg_size)) {

158 DEBUG(4) debugf("accept_message_stream(): "

159 "received %d bytes (conf.max_msg_size=%d)\n",

160 data_size, conf.max_msg_size);

161 return AERR_SIZE;

162 }

163

164 }

165

166 if (msg->data_list != NULL)

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

168 else

169 /* make sure data list is not NULL: */

170 msg->data_list = g_list_append(NULL, g_strdup(""));

171

172 DEBUG(4) debugf("received %d lines of data (%d bytes)\n", line_cnt, data_size);

173 /* we get here after we succesfully received the mail data */

174

175 msg->data_size = data_size;

176 msg->received_time = time(NULL);

177

178 return AERR_OK;

179 }

180

181 accept_error

182 accept_message_prepare(message * msg, guint flags)

183 {

184 struct passwd *passwd = NULL;

185 GList *non_rcpt_list = NULL;

186 time_t rec_time = time(NULL);

187

188 DEBUG(5) debugf("accept_message_prepare()\n");

189

190 /* create unique message id */

191 msg->uid = g_malloc(14);

192

193 string_base62(msg->uid, rec_time, 6);

194 msg->uid[6] = '-';

195 string_base62(&(msg->uid[7]), getpid(), 3);

196 msg->uid[10] = '-';

197 string_base62(&(msg->uid[11]), msg->transfer_id, 2);

198 msg->uid[13] = 0;

199

200 /* if local, get password entry */

201 if (msg->received_host == NULL) {

202 passwd = g_memdup(getpwuid(geteuid()), sizeof(struct passwd));

203 msg->ident = g_strdup(passwd->pw_name);

204 }

205

206 /* set return path if local */

207 if (msg->return_path == NULL && msg->received_host == NULL) {

208 gchar *path = g_strdup_printf("<%s@%s>", passwd->pw_name, conf.host_name);

209 DEBUG(3) debugf("setting return_path for local accept: %s\n", path);

210 msg->return_path = create_address(path, TRUE);

211 g_free(path);

212 }

213

214 /* -t option (see comment above) */

215 if (flags & ACC_DEL_RCPTS) {

216 non_rcpt_list = msg->rcpt_list;

217 msg->rcpt_list = NULL;

218 }

219

220 /* scan headers */

221 {

222 gboolean has_id = FALSE;

223 gboolean has_date = FALSE;

224 gboolean has_sender = FALSE;

225 gboolean has_from = FALSE;

226 gboolean has_to_or_cc = FALSE;

227 GList *hdr_node, *hdr_node_next;

228 header *hdr;

229

230 for (hdr_node = g_list_first(msg->hdr_list);

231 hdr_node != NULL; hdr_node = hdr_node_next) {

232 hdr_node_next = g_list_next(hdr_node);

233 hdr = ((header *) (hdr_node->data));

234 DEBUG(5) debugf("scanning headers: %s", hdr->header);

235 switch (hdr->id) {

236 case HEAD_MESSAGE_ID:

237 has_id = TRUE;

238 break;

239 case HEAD_DATE:

240 has_date = TRUE;

241 break;

242 case HEAD_FROM:

243 has_from = TRUE;

244 break;

245 case HEAD_SENDER:

246 has_sender = TRUE;

247 break;

248 case HEAD_TO:

249 case HEAD_CC:

250 has_to_or_cc = TRUE;

251 /* fall through */

252 case HEAD_BCC:

253 if (flags & ACC_RCPT_FROM_HEAD) {

254 /* -t option (see comment above) */

255 DEBUG(5) debugf("hdr->value = %s\n", hdr->value);

256 if (hdr->value) {

257 msg->rcpt_list = addr_list_append_rfc822(msg->rcpt_list, hdr->value, conf.host_name);

258 }

259 }

260 if (hdr->id == HEAD_BCC) {

261 DEBUG(3) debugf("removing 'Bcc' header\n");

262 msg->hdr_list = g_list_remove_link(msg->hdr_list, hdr_node);

263 g_list_free_1(hdr_node);

264 destroy_header(hdr);

265 }

266 break;

267 case HEAD_ENVELOPE_TO:

268 if (flags & ACC_SAVE_ENVELOPE_TO) {

269 DEBUG(3) debugf("creating 'X-Orig-Envelope-To' header\n");

270 msg->hdr_list = g_list_prepend(msg->hdr_list, create_header(HEAD_UNKNOWN,

271 "X-Orig-Envelope-to: %s", hdr->value));

272 }

273 DEBUG(3) debugf("removing 'Envelope-To' header\n");

274 msg->hdr_list = g_list_remove_link(msg->hdr_list, hdr_node);

275 g_list_free_1(hdr_node);

276 destroy_header(hdr);

277 break;

278 case HEAD_RETURN_PATH:

279 if (flags & ACC_MAIL_FROM_HEAD) {

280 /* usually POP3 accept */

281 msg->return_path = create_address_qualified(hdr->value, TRUE, msg->received_host);

282 DEBUG(3) debugf("setting return_path to %s\n", addr_string(msg->return_path));

283 }

284 DEBUG(3) debugf("removing 'Return-Path' header\n");

285 msg->hdr_list = g_list_remove_link(msg->hdr_list, hdr_node);

286 g_list_free_1(hdr_node);

287 destroy_header(hdr);

288 break;

289 default:

290 break; /* make compiler happy */

291 }

292 }

293

294 if (msg->return_path == NULL) {

295 /* this can happen for pop3 accept only and if no Return-path: header was given */

296 GList *hdr_list;

297 header *hdr;

298

299 DEBUG(3) debugf("return_path == NULL\n");

300

301 hdr_list = find_header(msg->hdr_list, HEAD_SENDER, NULL);

302 if (!hdr_list)

303 hdr_list = find_header(msg->hdr_list, HEAD_FROM, NULL);

304 if (hdr_list) {

305 gchar *addr;

306 hdr = (header *) (g_list_first(hdr_list)->data);

307

308 DEBUG(5) debugf("hdr->value = '%s'\n", hdr->value);

309

310 addr = g_strdup(hdr->value);

311 g_strchomp(addr);

312

313 if ((msg->return_path = create_address_qualified(addr, FALSE, msg->received_host)) != NULL) {

314 DEBUG(3) debugf("setting return_path to %s\n", addr_string(msg->return_path));

315 msg->hdr_list = g_list_append(msg->hdr_list, create_header(HEAD_UNKNOWN,

316 "X-Warning: return path set from %s address\n",

317 hdr->id == HEAD_SENDER ? "Sender:" : "From:"));

318 }

319 g_free(addr);

320 }

321 if (msg->return_path == NULL) { /* no Sender: or From: or create_address_qualified failed */

322 msg->return_path = create_address_qualified("postmaster", TRUE, conf.host_name);

323 DEBUG(3) debugf("setting return_path to %s\n", addr_string(msg->return_path));

324 msg->hdr_list = g_list_append(msg->hdr_list, create_header(HEAD_UNKNOWN,

325 "X-Warning: real return path is unknown\n"));

326 }

327 }

328

329 if (flags & ACC_DEL_RCPTS) {

330 /* remove the recipients given on the command line from the ones given in headers

331 -t option (see comment above) */

332 GList *rcpt_node;

333 foreach(non_rcpt_list, rcpt_node) {

334 address *rcpt = (address *) (rcpt_node->data);

335 GList *node;

336 if ((node = g_list_find_custom(msg->rcpt_list, rcpt, _g_list_addr_isequal))) {

337 DEBUG(3) debugf("removing rcpt address %s\n", addr_string(node->data));

338 msg->rcpt_list = g_list_remove_link(msg->rcpt_list, node);

339 destroy_address((address *) (node->data));

340 g_list_free_1(node);

341 }

342 }

343 }

344

345 /* here we should have our recipients, fail if not: */

346 if (msg->rcpt_list == NULL) {

347 logwrite(LOG_WARNING, "no recipients found in message\n");

348 return AERR_NORCPT;

349 }

350

351 if (!(has_sender || has_from)) {

352 DEBUG(3) debugf("adding 'From' header\n");

353 msg->hdr_list = g_list_append(msg->hdr_list,

354 msg->full_sender_name

355 ?

356 create_header(HEAD_FROM, "From: \"%s\" <%s@%s>\n", msg->full_sender_name,

357 msg->return_path->local_part, msg->return_path->domain)

358 :

359 create_header(HEAD_FROM, "From: <%s@%s>\n",

360 msg->return_path->local_part, msg->return_path->domain)

361 );

362 }

363 if (!has_to_or_cc) {

364 DEBUG(3) debugf("no To: or Cc: header, hence adding `To: undisclosed recipients:;'\n");

365 msg->hdr_list = g_list_append(msg->hdr_list, create_header(HEAD_TO, "To: undisclosed-recipients:;\n"));

366 }

367 if (!has_date) {

368 DEBUG(3) debugf("adding 'Date:' header\n");

369 msg->hdr_list = g_list_append(msg->hdr_list, create_header(HEAD_DATE, "Date: %s\n", rec_timestamp()));

370 }

371 if (!has_id) {

372 DEBUG(3) debugf("adding 'Message-ID:' header\n");

373 msg->hdr_list = g_list_append(msg->hdr_list,

374 create_header(HEAD_MESSAGE_ID, "Message-ID: <%s@%s>\n", msg->uid, conf.host_name));

375 }

376 }

377

378 /* Received header: */

379 /* At this point because we have to know the rcpts for the 'for' part */

380 gchar *for_string = NULL;

381 header *hdr = NULL;

382

383 DEBUG(3) debugf("adding 'Received:' header\n");

384

385 if (g_list_length(msg->rcpt_list) == 1) {

386 address *addr = (address *) (g_list_first(msg->rcpt_list)->data);

387 for_string = g_strdup_printf(" for %s", addr_string(addr));

388 }

389

390 if (msg->received_host == NULL) {

391 /* received locally */

392 hdr = create_header(HEAD_RECEIVED, "Received: from %s by %s with %s (%s %s) id %s%s; %s\n",

393 passwd->pw_name, conf.host_name, prot_names[msg->received_prot],

394 PACKAGE, VERSION, msg->uid, for_string ? for_string : "", rec_timestamp());

395 } else {

396 /* received from remote */

397 #ifdef ENABLE_IDENT

398 DEBUG(5) debugf("adding 'Received:' header (5)\n");

399 hdr = create_header(HEAD_RECEIVED, "Received: from %s (ident=%s) by %s with %s (%s %s) id %s%s; %s\n",

400 msg->received_host, msg->ident ? msg->ident : "unknown", conf.host_name,

401 prot_names[msg->received_prot], PACKAGE, VERSION, msg->uid, for_string ? for_string : "",

402 rec_timestamp());

403 #else

404 hdr = create_header(HEAD_RECEIVED, "Received: from %s by %s with %s (%s %s) id %s%s; %s\n",

405 msg->received_host, conf.host_name, prot_names[msg->received_prot],

406 PACKAGE, VERSION, msg->uid, for_string ? for_string : "", rec_timestamp());

407 #endif

408 }

409 header_fold(hdr);

410 msg->hdr_list = g_list_prepend(msg->hdr_list, hdr);

411

412 if (for_string)

413 g_free(for_string);

414

415 /* write message to spool: */

416 /* accept is no longer responsible for this

417 if (!spool_write(msg, TRUE))

418 return AERR_NOSPOOL;

419 */

420 return AERR_OK;

421 }

422

423 accept_error

424 accept_message(FILE * in, message * msg, guint flags)

425 {

426 accept_error err;

427

428 err = accept_message_stream(in, msg, flags);

429 if (err == AERR_OK)

430 err = accept_message_prepare(msg, flags);

431

432 return err;

433 }