masqmail: 5ec5e6637049 src/accept.c

masqmail

view src/accept.c @ 117:5ec5e6637049

added server-side SMTP SIZE support (patch by Paolo) ``SIZE 0'' (= unlimited) is currently not supported client-side support was already implemented

author	meillo@marmaro.de
date	Thu, 01 Jul 2010 13:08:53 +0200
parents	43798acdfbc9
children	cd59a5b4d3dd

line source

1 /* MasqMail

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

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

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

7 (at your option) any later version.

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

10 but WITHOUT ANY WARRANTY; without even the implied warranty of

11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the

12 GNU General Public License for more details.

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

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

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

17 */

19 #include "masqmail.h"

20 #include "readsock.h"

22 gchar *prot_names[] = {

23 "local",

24 "bsmtp",

25 "smtp",

26 "esmtp",

27 "pop3",

28 "apop",

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[] = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";

36 gchar *p = res + len;

37 *p = '\0';

38 while (p > res) {

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

40 value /= 62;

41 }

42 return res;

43 }

45 static gint

46 _g_list_addr_isequal(gconstpointer a, gconstpointer b)

47 {

48 address *addr1 = (address *) a;

49 address *addr2 = (address *) b;

50 int ret;

52 if ((ret = strcasecmp(addr1->domain, addr2->domain)) == 0)

53 return strcmp(addr1->local_part, addr2->local_part);

54 else

55 return ret;

56 }

58 /* accept message from anywhere.

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

61 The -t option:

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

63 headers to the recipients list.

64 The ACC_DEL_RCPTS flag makes only sense if the ACC_RCPT_FROM_HEAD

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

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

67 */

69 accept_error

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

71 {

72 gchar *line, *line1;

73 int line_size = MAX_DATALINE;

74 gboolean in_headers = TRUE;

75 header *hdr = NULL;

76 gint line_cnt = 0, data_size = 0;

78 line = g_malloc(line_size);

79 line[0] = '\0';

81 while (TRUE) {

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

84 line1 = line;

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

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

88 g_free(line);

89 break;

90 }

91 line1++;

92 }

94 if (len <= 0) {

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

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

97 gint len1 = strlen(line1);

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

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

100 line1[len1] = '\n';

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

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

103 data_size += strlen(line1);

104 line_cnt++;

105 }

106 }

107 break;

108 } else {

109 g_free(line);

110 if (len == -1) {

111 return AERR_EOF;

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

113 /* should not happen any more */

114 return AERR_OVERFLOW;

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

116 return AERR_TIMEOUT;

117 } else {

118 /* does not happen */

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

120 return AERR_UNKNOWN;

121 }

122 }

123 } else {

124 if (in_headers) {

125

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

127 if (msg->hdr_list == NULL)

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

129 continue;

130

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

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

133 if (hdr) {

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

135 }

136

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

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

139 in_headers = FALSE;

140 } else {

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

142 if ((hdr = get_header(line1)))

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

144 else {

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

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

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

148 in_headers = FALSE;

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

150 }

151 }

152 } else {

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

154 data_size += strlen(line1);

155 line_cnt++;

156 }

157 }

158 if (data_size > conf.max_msg_size) {

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

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

161 data_size, conf.max_msg_size);

162 return AERR_SIZE;

163 }

164

165 }

166

167 if (msg->data_list != NULL)

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

169 else

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

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

172

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

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

175

176 msg->data_size = data_size;

177 msg->received_time = time(NULL);

178

179 return AERR_OK;

180 }

181

182 accept_error

183 accept_message_prepare(message * msg, guint flags)

184 {

185 struct passwd *passwd = NULL;

186 GList *non_rcpt_list = NULL;

187 time_t rec_time = time(NULL);

188

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

190

191 /* create unique message id */

192 msg->uid = g_malloc(14);

193

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

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

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

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

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

199 msg->uid[13] = 0;

200

201 /* if local, get password entry */

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

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

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

205 }

206

207 /* set return path if local */

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

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

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

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

212 g_free(path);

213 }

214

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

216 if (flags & ACC_DEL_RCPTS) {

217 non_rcpt_list = msg->rcpt_list;

218 msg->rcpt_list = NULL;

219 }

220

221 /* scan headers */

222 {

223 gboolean has_id = FALSE;

224 gboolean has_date = FALSE;

225 gboolean has_sender = FALSE;

226 gboolean has_from = FALSE;

227 gboolean has_to_or_cc = FALSE;

228 GList *hdr_node, *hdr_node_next;

229 header *hdr;

230

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

232 hdr_node != NULL; hdr_node = hdr_node_next) {

233 hdr_node_next = g_list_next(hdr_node);

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

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

236 switch (hdr->id) {

237 case HEAD_MESSAGE_ID:

238 has_id = TRUE;

239 break;

240 case HEAD_DATE:

241 has_date = TRUE;

242 break;

243 case HEAD_FROM:

244 has_from = TRUE;

245 break;

246 case HEAD_SENDER:

247 has_sender = TRUE;

248 break;

249 case HEAD_TO:

250 case HEAD_CC:

251 has_to_or_cc = TRUE;

252 /* fall through */

253 case HEAD_BCC:

254 if (flags & ACC_RCPT_FROM_HEAD) {

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

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

257 if (hdr->value) {

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

259 }

260 }

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

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

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

264 g_list_free_1(hdr_node);

265 destroy_header(hdr);

266 }

267 break;

268 case HEAD_ENVELOPE_TO:

269 if (flags & ACC_SAVE_ENVELOPE_TO) {

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

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

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

273 }

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

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

276 g_list_free_1(hdr_node);

277 destroy_header(hdr);

278 break;

279 case HEAD_RETURN_PATH:

280 if (flags & ACC_MAIL_FROM_HEAD) {

281 /* usually POP3 accept */

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

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

284 }

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

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

287 g_list_free_1(hdr_node);

288 destroy_header(hdr);

289 break;

290 default:

291 break; /* make compiler happy */

292 }

293 }

294

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

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

297 GList *hdr_list;

298 header *hdr;

299

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

301

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

303 if (!hdr_list)

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

305 if (hdr_list) {

306 gchar *addr;

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

308

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

310

311 addr = g_strdup(hdr->value);

312 g_strchomp(addr);

313

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

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

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

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

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

319 }

320 g_free(addr);

321 }

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

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

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

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

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

327 }

328 }

329

330 if (flags & ACC_DEL_RCPTS) {

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

332 -t option (see comment above) */

333 GList *rcpt_node;

334 foreach(non_rcpt_list, rcpt_node) {

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

336 GList *node;

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

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

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

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

341 g_list_free_1(node);

342 }

343 }

344 }

345

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

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

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

349 return AERR_NORCPT;

350 }

351

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

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

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

355 msg->full_sender_name

356 ?

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

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

359 :

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

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

362 );

363 }

364 if (!has_to_or_cc) {

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

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

367 }

368 if (!has_date) {

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

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

371 }

372 if (!has_id) {

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

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

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

376 }

377 }

378

379 /* Received header: */

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

381 gchar *for_string = NULL;

382 header *hdr = NULL;

383

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

385

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

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

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

389 }

390

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

392 /* received locally */

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

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

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

396 } else {

397 /* received from remote */

398 #ifdef ENABLE_IDENT

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

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

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

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

403 rec_timestamp());

404 #else

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

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

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

408 #endif

409 }

410 header_fold(hdr);

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

412

413 if (for_string)

414 g_free(for_string);

415

416 /* write message to spool: */

417 /* accept is no longer responsible for this

418 if (!spool_write(msg, TRUE))

419 return AERR_NOSPOOL;

420 */

421 return AERR_OK;

422 }

423

424 accept_error

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

426 {

427 accept_error err;

428

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

430 if (err == AERR_OK)

431 err = accept_message_prepare(msg, flags);

432

433 return err;

434 }