masqmail: aa40710f09fe src/accept.c

masqmail

view src/accept.c @ 388:aa40710f09fe

Refactoring and code layouting.

author	markus schnalke <meillo@marmaro.de>
date	Sat, 18 Feb 2012 13:37:40 +0100
parents	5781ba87df95
children	9b93c0a3bd8c

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 "masqmail.h"

22 #include "readsock.h"

24 /* must match PROT_* in masqmail.h */

25 gchar *prot_names[] = {

26 "local",

27 "SMTP",

28 "ESMTP",

29 "(unknown)" /* should not happen, but better than crashing. */

30 };

32 static gchar*

33 string_base62(gchar *res, guint value, gchar len)

34 {

35 static gchar base62_chars[] = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ"

36 "abcdefghijklmnopqrstuvwxyz";

37 gchar *p = res + len;

38 *p = '\0';

39 while (p > res) {

40 *(--p) = base62_chars[value % 62];

41 value /= 62;

42 }

43 return res;

44 }

46 /*

47 ** accept message from anywhere.

48 ** A message from local is indicated by msg->recieved_host == NULL

49 **

50 ** The -t option: With the ACC_RCPT_FROM_HEAD flag the addrs found found

51 ** in To/Cc/Bcc headers are added to the recipient list.

52 */

53 accept_error

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

55 {

56 gchar *line, *line1;

57 int line_size = MAX_DATALINE;

58 gboolean in_headers = TRUE;

59 header *hdr = NULL;

60 gint line_cnt = 0, data_size = 0;

62 line = g_malloc(line_size);

63 *line = '\0';

65 while (1) {

66 int len = read_sockline1(in, &line, &line_size, 5 * 60,

67 READSOCKL_CVT_CRLF);

68 line1 = line;

70 if ((*line == '.') && (!(flags & ACC_DOT_IGNORE))) {

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

72 g_free(line);

73 break;

74 }

75 line1++;

76 }

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

79 /* at EOF but last line was not terminated by CR */

80 /* some MUAs allow unterminated lines */

81 gint len1 = strlen(line1);

82 if (len1 > 0 && line1[len1-1] != '\n') {

83 line1[len1] = '\n';

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

85 msg->data_list = g_list_prepend(msg->data_list,

86 g_strdup(line1));

87 data_size += strlen(line1);

88 line_cnt++;

89 }

90 break;

92 } else if (len == -1) {

93 g_free(line);

94 return AERR_EOF;

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

97 /* should not happen any more */

98 g_free(line);

99 return AERR_OVERFLOW;

100

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

102 g_free(line);

103 return AERR_TIMEOUT;

104

105 } else if (len <= 0) {

106 /* does not happen */

107 g_free(line);

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

109 return AERR_UNKNOWN;

110

111 }

112

113 if (in_headers) {

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

115 if (!msg->hdr_list && strncmp(line1, "From ", 5)==0) {

116 continue;

117 }

118

119 if (*line1 == ' ' || *line1 == '\t') {

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

121 if (hdr) {

122 char *cp;

123 cp = g_strconcat(hdr->header, line1,

124 NULL);

125 hdr->value = cp + (hdr->value -

126 hdr->header);

127 free(hdr->header);

128 hdr->header = cp;

129 }

130 } else if (*line1 == '\n') {

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

132 in_headers = FALSE;

133

134 } else if ((hdr = get_header(line1))) {

135 /* another header */

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

137 } else {

138 /*

139 ** Should be another header but none was

140 ** recognized, so this seems to be the first

141 ** data line of a broken mailer which does

142 ** not add an empty line after the headers.

143 */

144 in_headers = FALSE;

145 msg->data_list = g_list_prepend(msg->data_list,

146 g_strdup(line1));

147 }

148 } else {

149 /* message body */

150 msg->data_list = g_list_prepend(msg->data_list,

151 g_strdup(line1));

152 data_size += strlen(line1);

153 line_cnt++;

154 }

155

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

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

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

159 data_size, conf.max_msg_size);

160 return AERR_SIZE;

161 }

162 }

163 DEBUG(4) debugf("received %d lines of data (%d bytes)\n",

164 line_cnt, data_size);

165

166 if (!msg->data_list) {

167 /* make sure data list is not NULL */

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

169 }

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

171

172 /* we have succesfully received the mail data */

173

174 msg->data_size = data_size;

175 msg->received_time = time(NULL);

176

177 return AERR_OK;

178 }

179

180 static void

181 ensure_return_path(message *msg)

182 {

183 GList *hdr_list;

184 header *hdr;

185 gchar *addr;

186

187 if (msg->return_path) {

188 return;

189 }

190

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

192

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

194 if (!hdr_list) {

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

196 }

197 if (hdr_list) {

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

199

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

201

202 addr = g_strdup(hdr->value);

203 g_strchomp(addr);

204 msg->return_path = create_address_qualified(addr,

205 FALSE, msg->received_host);

206 if (msg->return_path) {

207 DEBUG(3) debugf("setting return_path to %s\n",

208 addr_string(msg->return_path));

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

210 create_header(HEAD_UNKNOWN,

211 "X-Warning: return path set from %s "

212 "address\n",

213 (hdr->id == HEAD_SENDER) ?

214 "Sender:" : "From:"));

215 }

216 g_free(addr);

217 }

218 if (!msg->return_path) {

219 /* no Sender: or From: or create_address_qualified failed */

220 msg->return_path = create_address_qualified("postmaster",

221 TRUE, conf.host_name);

222 DEBUG(3) debugf("setting return_path to %s\n",

223 addr_string(msg->return_path));

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

225 create_header(HEAD_UNKNOWN,

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

227 }

228 }

229

230 static accept_error

231 scan_headers(message *msg, guint flags)

232 {

233 gboolean has_id = FALSE;

234 gboolean has_date = FALSE;

235 gboolean has_sender = FALSE;

236 gboolean has_from = FALSE;

237 gboolean has_to_or_cc = FALSE;

238 GList *hdr_node, *hdr_node_next;

239 header *hdr;

240

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

242 hdr_node = hdr_node_next) {

243 hdr_node_next = g_list_next(hdr_node);

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

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

246 switch (hdr->id) {

247 case HEAD_MESSAGE_ID:

248 has_id = TRUE;

249 break;

250 case HEAD_DATE:

251 has_date = TRUE;

252 break;

253 case HEAD_FROM:

254 has_from = TRUE;

255 break;

256 case HEAD_SENDER:

257 has_sender = TRUE;

258 break;

259 case HEAD_TO:

260 case HEAD_CC:

261 has_to_or_cc = TRUE;

262 /* fall through */

263 case HEAD_BCC:

264 if (flags & ACC_RCPT_FROM_HEAD) {

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

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

267 hdr->value);

268 if (hdr->value) {

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

270 }

271 }

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

273 DEBUG(3) debugf("removing 'Bcc' 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 }

278 break;

279 case HEAD_ENVELOPE_TO:

280 if (flags & ACC_SAVE_ENVELOPE_TO) {

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

282 msg->hdr_list = g_list_prepend(msg->hdr_list,

283 create_header(HEAD_UNKNOWN,

284 "X-Orig-Envelope-To: %s",

285 hdr->value));

286 }

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

288 msg->hdr_list = g_list_remove_link(msg->hdr_list,

289 hdr_node);

290 g_list_free_1(hdr_node);

291 destroy_header(hdr);

292 break;

293 case HEAD_RETURN_PATH:

294 if (flags & ACC_MAIL_FROM_HEAD) {

295 /* usually POP3 accept */

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

297 DEBUG(3) debugf("setting return_path to %s\n",

298 addr_string(msg->return_path));

299 }

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

301 msg->hdr_list = g_list_remove_link(msg->hdr_list,

302 hdr_node);

303 g_list_free_1(hdr_node);

304 destroy_header(hdr);

305 break;

306 default:

307 break; /* make compiler happy */

308 }

309 }

310

311 /*

312 ** TODO: do we still need this as we don't fetch

313 ** mail anymore?

314 ** This can happen for pop3 accept only and if no

315 ** Return-Path: header was given

316 */

317 ensure_return_path(msg);

318

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

320 if (!msg->rcpt_list) {

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

322 return AERR_NORCPT;

323 }

324

325 if (!has_sender && !has_from) {

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

327 if (msg->full_sender_name) {

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

329 create_header(HEAD_FROM,

330 "From: \"%s\" <%s@%s>\n",

331 msg->full_sender_name,

332 msg->return_path->local_part,

333 msg->return_path->domain));

334 } else {

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

336 create_header(HEAD_FROM,

337 "From: <%s@%s>\n",

338 msg->return_path->local_part,

339 msg->return_path->domain));

340 }

341 }

342 if (!has_to_or_cc) {

343 DEBUG(3) debugf("no To: or Cc: header, hence adding "

344 "`To: undisclosed recipients:;'\n");

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

346 create_header(HEAD_TO,

347 "To: undisclosed-recipients:;\n"));

348 }

349 if (!has_date) {

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

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

352 create_header(HEAD_DATE, "Date: %s\n",

353 rec_timestamp()));

354 }

355 if (!has_id) {

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

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

358 create_header(HEAD_MESSAGE_ID,

359 "Message-ID: <%s@%s>\n",

360 msg->uid, conf.host_name));

361 }

362

363 return AERR_OK;

364 }

365

366 static void

367 add_received_hdr(message *msg)

368 {

369 gchar *for_string = NULL;

370 header *hdr = NULL;

371 address *addr;

372

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

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

375 /* The `for' part only if exactly one rcpt is present */

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

377 for_string = g_strdup_printf("\n\tfor %s", addr_string(addr));

378 }

379 if (!msg->received_host) {

380 /* received locally */

381 hdr = create_header(HEAD_RECEIVED,

382 "Received: by %s (%s %s, from userid %d)\n"

383 "\tid %s%s; %s\n",

384 conf.host_name, PACKAGE, VERSION, geteuid(),

385 msg->uid,

386 for_string ? for_string : "", rec_timestamp());

387 } else {

388 /* received from remote */

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

390 hdr = create_header(HEAD_RECEIVED,

391 "Received: from %s\n"

392 "\tby %s with %s (%s %s)\n"

393 "\tid %s%s; %s\n",

394 msg->received_host, conf.host_name,

395 prot_names[msg->received_prot], PACKAGE,

396 VERSION, msg->uid,

397 for_string ? for_string : "", rec_timestamp());

398 }

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

400 if (for_string) {

401 g_free(for_string);

402 }

403 }

404

405 accept_error

406 accept_message_prepare(message *msg, guint flags)

407 {

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

409

410 /* generate unique message id */

411 msg->uid = g_malloc(14);

412 string_base62(msg->uid, time(NULL), 6);

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

414 string_base62(msg->uid + 7, getpid(), 3);

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

416 string_base62(msg->uid + 11, msg->transfer_id, 2);

417 msg->uid[13] = '\0';

418

419 /* if local, get password entry and set return path if missing */

420 if (!msg->received_host) {

421 struct passwd *passwd = NULL;

422

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

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

425 if (!msg->return_path) {

426 gchar *path = g_strdup_printf("<%s@%s>",

427 passwd->pw_name, conf.host_name);

428 DEBUG(3) debugf("setting return_path for local "

429 "accept: %s\n", path);

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

431 g_free(path);

432 }

433 }

434

435 if (scan_headers(msg, flags) == AERR_NORCPT) {

436 return AERR_NORCPT;

437 }

438

439 /* after the hdrs are scanned because we need to know the rcpts */

440 add_received_hdr(msg);

441

442 return AERR_OK;

443 }

444

445 accept_error

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

447 {

448 accept_error err;

449

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

451 if (err == AERR_OK) {

452 err = accept_message_prepare(msg, flags);

453 }

454

455 return err;

456 }