masqmail: 1e2fd87d58ea src/smtp

masqmail

view src/smtp_in.c @ 119:1e2fd87d58ea

some annotations related to mail sending with SMTP SIZE

author	meillo@marmaro.de
date	Thu, 01 Jul 2010 13:11:38 +0200
parents	71ce3a1568e9
children	cd59a5b4d3dd

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 /*

24 I always forget these rfc numbers:

25 RFC 821 (SMTP)

26 RFC 1869 (ESMTP)

27 RFC 1870 (ESMTP SIZE)

28 RFC 2197 (ESMTP PIPELINE)

29 RFC 2554 (ESMTP AUTH)

30 */

32 #ifdef ENABLE_SMTP_SERVER

34 smtp_cmd smtp_cmds[] = {

35 {SMTP_HELO, "HELO",},

36 {SMTP_EHLO, "EHLO",},

37 {SMTP_MAIL_FROM, "MAIL FROM:",},

38 {SMTP_RCPT_TO, "RCPT TO:",},

39 {SMTP_DATA, "DATA",},

40 {SMTP_QUIT, "QUIT",},

41 {SMTP_RSET, "RSET",},

42 {SMTP_NOOP, "NOOP",},

43 {SMTP_HELP, "HELP"},

44 };

46 static smtp_cmd_id

47 get_id(const gchar * line)

48 {

49 gint i;

50 for (i = 0; i < SMTP_NUM_IDS; i++) {

51 if (strncasecmp(smtp_cmds[i].cmd, line, strlen(smtp_cmds[i].cmd)) == 0) {

52 return (smtp_cmd_id) i;

53 }

54 }

55 return SMTP_ERROR;

56 }

58 static gboolean

59 get_size(gchar *line, unsigned long *msize) {

60 gchar *s = NULL;

62 /* hope we need not to handle cases like SiZe= ...*/

63 s = strstr(line, "SIZE=");

64 if (!s) {

65 /* try it in lowercase too */

66 if (!(s = strstr(line, "size="))) {

67 return FALSE;

68 }

69 }

70 s += 5;

71 *msize = atol(s);

72 DEBUG(5) debugf("get_size(): line=%s, msize=%ld\n", line, *msize);

74 return TRUE;

75 }

78 /* this is a quick hack: we expect the address to be syntactically correct

79 and containing the mailbox only, though we first check for size in

80 smtp_in().

81 */

82 static gboolean

83 get_address(gchar * line, gchar * addr)

84 {

85 gchar *p = line;

86 gchar *q = addr;

88 /* skip MAIL FROM: and RCPT TO: */

89 while (*p && (*p != ':')) {

90 p++;

91 }

92 p++;

94 /* skip spaces: */

95 while (*p && isspace(*p)) {

96 p++;

97 }

99 /* get address: */

100 while (*p && !isspace(*p) && (q < addr + MAX_ADDRESS - 1)) {

101 *(q++) = *(p++);

102 }

103 *q = 0;

104

105 return TRUE;

106 }

107

108 static smtp_connection*

109 create_base(gchar * remote_host)

110 {

111 smtp_connection *base = g_malloc(sizeof(smtp_connection));

112 if (!base) {

113 return NULL;

114 }

115

116 base->remote_host = g_strdup(remote_host);

117

118 base->prot = PROT_SMTP;

119 base->next_id = 0;

120 base->helo_seen = 0;

121 base->from_seen = 0;

122 base->rcpt_seen = 0;

123 base->msg = NULL;

124

125 return base;

126 }

127

128 static void

129 smtp_printf(FILE * out, gchar * fmt, ...)

130 {

131 va_list args;

132 va_start(args, fmt);

133

134 DEBUG(4) {

135 gchar buf[256];

136 va_list args_copy;

137

138 va_copy(args_copy, args);

139 vsnprintf(buf, 255, fmt, args_copy);

140 va_end(args_copy);

141

142 debugf(">>>%s", buf);

143 }

144

145 vfprintf(out, fmt, args);

146 fflush(out);

147

148 va_end(args);

149 }

150

151 void

152 smtp_in(FILE * in, FILE * out, gchar * remote_host, gchar * ident)

153 {

154 gchar *buffer;

155 smtp_cmd_id cmd_id;

156 message *msg = NULL;

157 smtp_connection *psc;

158 int len;

159 unsigned long size, msize;

160

161 DEBUG(5) debugf("smtp_in entered, remote_host = %s\n", remote_host);

162

163 psc = create_base(remote_host);

164 psc->msg = msg;

165

166 buffer = (gchar *) g_malloc(BUF_LEN);

167 if (!buffer) {

168 /* this check is actually unneccessary as g_malloc()

169 aborts on failure */

170 return;

171 }

172

173 /* send greeting string, containing ESMTP: */

174 smtp_printf(out, "220 %s MasqMail %s ESMTP\r\n", conf.host_name, VERSION);

175

176 while ((len = read_sockline(in, buffer, BUF_LEN, 5 * 60, READSOCKL_CHUG)) >= 0) {

177 cmd_id = get_id(buffer);

178

179 switch (cmd_id) {

180 case SMTP_EHLO:

181 psc->prot = PROT_ESMTP;

182 /* fall through */

183 case SMTP_HELO:

184 psc->helo_seen = TRUE;

185

186 if (conf.defer_all) { /* I need this to debug delivery failures */

187 smtp_printf(out, "421 %s service temporarily unavailable.\r\n", conf.host_name);

188 break;

189 }

190

191 if (psc->prot == PROT_ESMTP) {

192 smtp_printf(out, "250-%s Nice to meet you with ESMTP\r\n", conf.host_name);

193 smtp_printf(out, "250-SIZE %d\r\n", conf.max_msg_size);

194 smtp_printf(out, "250-PIPELINING\r\n" "250 HELP\r\n");

195 } else {

196 smtp_printf(out, "250 %s pretty old mailer, huh?\r\n", conf.host_name);

197 }

198 break;

199

200 case SMTP_MAIL_FROM:

201 if (get_size(buffer, &msize)) {

202 DEBUG(5) debugf("smtp_in(): get_size: msize=%ld, conf.mms=%d\n",

203 msize, conf.max_msg_size);

204 if (msize > conf.max_msg_size) {

205 smtp_printf(out, "552 Message size exceeds fixed limit.\r\n");

206 break;

207 }

208 }

209

210 {

211 gchar buf[MAX_ADDRESS];

212 address *addr;

213

214 if (!psc->helo_seen) {

215 smtp_printf(out, "503 need HELO or EHLO\r\n");

216 break;

217 }

218 if (psc->from_seen) {

219 smtp_printf(out, "503 MAIL FROM: already given.\r\n");

220 break;

221 }

222

223 msg = create_message();

224 msg->received_host = remote_host ? g_strdup(remote_host) : NULL;

225 msg->received_prot = psc->prot;

226 msg->ident = ident ? g_strdup(ident) : NULL;

227 /* get transfer id and increment for next one */

228 msg->transfer_id = (psc->next_id)++;

229

230 get_address(buffer, buf);

231 if (remote_host) {

232 addr = create_address(buf, TRUE);

233 } else {

234 addr = create_address_qualified(buf, TRUE, conf.host_name);

235 }

236 if (!addr) {

237 smtp_printf(out, "501 %s: syntax error.\r\n", buf);

238 } else if (!addr->domain) {

239 smtp_printf(out, "501 return path must be qualified.\r\n", buf);

240 } else {

241 psc->from_seen = TRUE;

242 msg->return_path = addr;

243 smtp_printf(out, "250 OK %s is a nice guy.\r\n", addr->address);

244 }

245 }

246 break;

247

248 case SMTP_RCPT_TO:

249 {

250 char buf[MAX_ADDRESS];

251 address *addr;

252

253 if (!psc->helo_seen) {

254 smtp_printf(out, "503 need HELO or EHLO.\r\n");

255 break;

256 }

257 if (!psc->from_seen) {

258 smtp_printf(out, "503 need MAIL FROM: before RCPT TO:\r\n");

259 break;

260 }

261

262 get_address(buffer, buf);

263 if (remote_host) {

264 addr = create_address(buf, TRUE);

265 } else {

266 addr = create_address_qualified(buf, TRUE, conf.host_name);

267 }

268 if (!addr) {

269 smtp_printf(out, "501 %s: syntax error in address.\r\n", buf);

270 break;

271 }

272 if (addr->local_part[0] == '|') {

273 smtp_printf(out, "501 %s: no pipe allowed for SMTP connections\r\n", buf);

274 break;

275 }

276 if (!addr->domain) {

277 smtp_printf(out, "501 recipient address must be qualified.\r\n", buf);

278 break;

279 }

280 gboolean do_relay = conf.do_relay;

281 if (!do_relay) {

282 do_relay = addr_is_local(msg->return_path);

283 if (!do_relay) {

284 do_relay = addr_is_local(addr);

285 }

286 }

287 if (!do_relay) {

288 smtp_printf(out, "550 relaying to %s denied.\r\n", addr_string(addr));

289 break;

290 }

291 psc->rcpt_seen = TRUE;

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

293 smtp_printf(out, "250 OK %s is our friend.\r\n", addr->address);

294 }

295 break;

296

297 case SMTP_DATA:

298 if (!psc->helo_seen) {

299 smtp_printf(out, "503 need HELO or EHLO.\r\n");

300 break;

301 }

302 if (!psc->rcpt_seen) {

303 smtp_printf(out, "503 need RCPT TO: before DATA\r\n");

304 break;

305 }

306 accept_error err;

307

308 smtp_printf(out, "354 okay, and do not forget the dot\r\n");

309

310 err = accept_message(in, msg, conf.do_save_envelope_to ? ACC_SAVE_ENVELOPE_TO : 0);

311 if (err != AERR_OK) {

312 switch (err) {

313 case AERR_TIMEOUT:

314 case AERR_EOF:

315 return;

316 case AERR_SIZE:

317 smtp_printf(out, "552 Error: message too large.\r\n");

318 return;

319 default:

320 /* should never happen: */

321 smtp_printf(out, "451 Unknown error\r\n");

322 return;

323 }

324 }

325

326

327 if (!spool_write(msg, TRUE)) {

328 smtp_printf(out, "451 Could not write spool file\r\n");

329 return;

330 }

331 pid_t pid;

332 smtp_printf(out, "250 OK id=%s\r\n", msg->uid);

333

334 if (remote_host != NULL) {

335 logwrite(LOG_NOTICE, "%s <= <%s@%s> host=%s with %s\n", msg->uid,

336 msg->return_path->local_part, msg->return_path->domain,

337 remote_host, prot_names[psc->prot]);

338 } else {

339 logwrite(LOG_NOTICE, "%s <= <%s@%s> with %s\n", msg->uid,

340 msg->return_path->local_part, msg->return_path->domain,

341 prot_names[psc->prot]);

342 }

343

344 if (conf.do_queue) {

345 DEBUG(1) debugf("queuing forced by configuration or option.\n");

346 } else {

347 pid = fork();

348 if (pid == 0) {

349 _exit(deliver(msg));

350 } else if (pid < 0) {

351 logwrite(LOG_ALERT, "could not fork for delivery, id = %s", msg->uid);

352 }

353 }

354 psc->rcpt_seen = psc->from_seen = FALSE;

355 destroy_message(msg);

356 msg = NULL;

357 break;

358

359 case SMTP_QUIT:

360 smtp_printf(out, "221 goodbye\r\n");

361 destroy_message(msg);

362 msg = NULL;

363 return;

364

365 case SMTP_RSET:

366 psc->from_seen = psc->rcpt_seen = FALSE;

367 destroy_message(msg);

368 msg = NULL;

369 smtp_printf(out, "250 OK\r\n");

370 break;

371

372 case SMTP_NOOP:

373 smtp_printf(out, "250 OK\r\n");

374 break;

375

376 case SMTP_HELP:

377 {

378 int i;

379

380 smtp_printf(out, "214-supported commands:\r\n");

381 for (i = 0; i < SMTP_NUM_IDS - 1; i++) {

382 smtp_printf(out, "214-%s\r\n", smtp_cmds[i].cmd);

383 }

384 smtp_printf(out, "214 %s\r\n", smtp_cmds[i].cmd);

385 }

386 break;

387

388 default:

389 smtp_printf(out, "501 command not recognized\r\n");

390 DEBUG(1) debugf("command not recognized, was '%s'\n", buffer);

391 break;

392 }

393 }

394 switch (len) {

395 case -3:

396 logwrite(LOG_NOTICE, "connection timed out\n");

397 break;

398 case -2:

399 logwrite(LOG_NOTICE, "line overflow\n");

400 break;

401 case -1:

402 logwrite(LOG_NOTICE, "received EOF\n");

403 break;

404 default:

405 break;

406 }

407 }

408 #endif