masqmail: 50011f65bd35 src/accept.c

masqmail

view src/accept.c @ 197:50011f65bd35

added comment: TODO file may not be up-to-date there is some stuff in it that is not wanted any longer there are goals not included in it

author	meillo@marmaro.de
date	Fri, 16 Jul 2010 10:06:32 +0200
parents	cd59a5b4d3dd
children	996b53a50f55

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

28 };

30 static gchar*

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

32 {

33 static gchar base62_chars[] = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";

34 gchar *p = res + len;

35 *p = '\0';

36 while (p > res) {

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

38 value /= 62;

39 }

40 return res;

41 }

43 static gint

44 _g_list_addr_isequal(gconstpointer a, gconstpointer b)

45 {

46 address *addr1 = (address *) a;

47 address *addr2 = (address *) b;

48 int ret;

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

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

52 else

53 return ret;

54 }

56 /* accept message from anywhere.

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

59 The -t option:

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

61 headers to the recipients list.

62 The ACC_DEL_RCPTS flag makes only sense if the ACC_RCPT_FROM_HEAD

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

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

65 */

67 accept_error

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

69 {

70 gchar *line, *line1;

71 int line_size = MAX_DATALINE;

72 gboolean in_headers = TRUE;

73 header *hdr = NULL;

74 gint line_cnt = 0, data_size = 0;

76 line = g_malloc(line_size);

77 line[0] = '\0';

79 while (TRUE) {

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

82 line1 = line;

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

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

86 g_free(line);

87 break;

88 }

89 line1++;

90 }

92 if (len <= 0) {

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

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

95 gint len1 = strlen(line1);

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

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

98 line1[len1] = '\n';

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

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

101 data_size += strlen(line1);

102 line_cnt++;

103 }

104 }

105 break;

106 } else {

107 g_free(line);

108 if (len == -1) {

109 return AERR_EOF;

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

111 /* should not happen any more */

112 return AERR_OVERFLOW;

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

114 return AERR_TIMEOUT;

115 } else {

116 /* does not happen */

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

118 return AERR_UNKNOWN;

119 }

120 }

121 } else {

122 if (in_headers) {

123

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

125 if (msg->hdr_list == NULL)

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

127 continue;

128

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

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

131 if (hdr) {

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

133 }

134

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

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

137 in_headers = FALSE;

138 } else {

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

140 if ((hdr = get_header(line1)))

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

142 else {

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

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

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

146 in_headers = FALSE;

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

148 }

149 }

150 } else {

151 msg->data_list = g_list_prepend(msg->data_list, 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 }

164

165 if (msg->data_list != NULL)

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

167 else

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

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

170

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

172 /* we get here after we 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 accept_error

181 accept_message_prepare(message * msg, guint flags)

182 {

183 struct passwd *passwd = NULL;

184 GList *non_rcpt_list = NULL;

185 time_t rec_time = time(NULL);

186

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

188

189 /* create unique message id */

190 msg->uid = g_malloc(14);

191

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

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

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

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

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

197 msg->uid[13] = 0;

198

199 /* if local, get password entry */

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

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

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

203 }

204

205 /* set return path if local */

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

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

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

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

210 g_free(path);

211 }

212

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

214 if (flags & ACC_DEL_RCPTS) {

215 non_rcpt_list = msg->rcpt_list;

216 msg->rcpt_list = NULL;

217 }

218

219 /* scan headers */

220 {

221 gboolean has_id = FALSE;

222 gboolean has_date = FALSE;

223 gboolean has_sender = FALSE;

224 gboolean has_from = FALSE;

225 gboolean has_to_or_cc = FALSE;

226 GList *hdr_node, *hdr_node_next;

227 header *hdr;

228

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

230 hdr_node != NULL; hdr_node = hdr_node_next) {

231 hdr_node_next = g_list_next(hdr_node);

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

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

234 switch (hdr->id) {

235 case HEAD_MESSAGE_ID:

236 has_id = TRUE;

237 break;

238 case HEAD_DATE:

239 has_date = TRUE;

240 break;

241 case HEAD_FROM:

242 has_from = TRUE;

243 break;

244 case HEAD_SENDER:

245 has_sender = TRUE;

246 break;

247 case HEAD_TO:

248 case HEAD_CC:

249 has_to_or_cc = TRUE;

250 /* fall through */

251 case HEAD_BCC:

252 if (flags & ACC_RCPT_FROM_HEAD) {

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

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

255 if (hdr->value) {

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

257 }

258 }

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

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

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

262 g_list_free_1(hdr_node);

263 destroy_header(hdr);

264 }

265 break;

266 case HEAD_ENVELOPE_TO:

267 if (flags & ACC_SAVE_ENVELOPE_TO) {

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

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

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

271 }

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

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

274 g_list_free_1(hdr_node);

275 destroy_header(hdr);

276 break;

277 case HEAD_RETURN_PATH:

278 if (flags & ACC_MAIL_FROM_HEAD) {

279 /* usually POP3 accept */

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

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

282 }

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

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

285 g_list_free_1(hdr_node);

286 destroy_header(hdr);

287 break;

288 default:

289 break; /* make compiler happy */

290 }

291 }

292

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

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

295 GList *hdr_list;

296 header *hdr;

297

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

299

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

301 if (!hdr_list)

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

303 if (hdr_list) {

304 gchar *addr;

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

306

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

308

309 addr = g_strdup(hdr->value);

310 g_strchomp(addr);

311

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

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

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

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

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

317 }

318 g_free(addr);

319 }

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

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

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

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

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

325 }

326 }

327

328 if (flags & ACC_DEL_RCPTS) {

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

330 -t option (see comment above) */

331 GList *rcpt_node;

332 foreach(non_rcpt_list, rcpt_node) {

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

334 GList *node;

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

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

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

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

339 g_list_free_1(node);

340 }

341 }

342 }

343

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

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

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

347 return AERR_NORCPT;

348 }

349

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

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

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

353 msg->full_sender_name

354 ?

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

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

357 :

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

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

360 );

361 }

362 if (!has_to_or_cc) {

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

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

365 }

366 if (!has_date) {

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

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

369 }

370 if (!has_id) {

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

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

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

374 }

375 }

376

377 /* Received header: */

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

379 gchar *for_string = NULL;

380 header *hdr = NULL;

381

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

383

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

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

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

387 }

388

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

390 /* received locally */

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

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

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

394 } else {

395 /* received from remote */

396 #ifdef ENABLE_IDENT

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

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

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

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

401 rec_timestamp());

402 #else

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

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

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

406 #endif

407 }

408 header_fold(hdr);

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

410

411 if (for_string)

412 g_free(for_string);

413

414 /* write message to spool: */

415 /* accept is no longer responsible for this

416 if (!spool_write(msg, TRUE))

417 return AERR_NOSPOOL;

418 */

419 return AERR_OK;

420 }

421

422 accept_error

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

424 {

425 accept_error err;

426

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

428 if (err == AERR_OK)

429 err = accept_message_prepare(msg, flags);

430

431 return err;

432 }