masqmail

annotate src/smtp_in.c @ 172:cd38f10532e7

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author meillo@marmaro.de
date Wed, 14 Jul 2010 00:55:22 +0200
parents b072426cc6bb
children 5745edd5b769
rev   line source
meillo@0 1 /* MasqMail
meillo@0 2 Copyright (C) 1999-2001 Oliver Kurth
meillo@80 3 Copyright (C) 2010 markus schnalke <meillo@marmaro.de>
meillo@0 4
meillo@0 5 This program is free software; you can redistribute it and/or modify
meillo@0 6 it under the terms of the GNU General Public License as published by
meillo@0 7 the Free Software Foundation; either version 2 of the License, or
meillo@0 8 (at your option) any later version.
meillo@0 9
meillo@0 10 This program is distributed in the hope that it will be useful,
meillo@0 11 but WITHOUT ANY WARRANTY; without even the implied warranty of
meillo@0 12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
meillo@0 13 GNU General Public License for more details.
meillo@0 14
meillo@0 15 You should have received a copy of the GNU General Public License
meillo@0 16 along with this program; if not, write to the Free Software
meillo@0 17 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
meillo@0 18 */
meillo@0 19
meillo@0 20 #include "masqmail.h"
meillo@0 21 #include "readsock.h"
meillo@0 22
meillo@0 23 /*
meillo@0 24 I always forget these rfc numbers:
meillo@0 25 RFC 821 (SMTP)
meillo@0 26 RFC 1869 (ESMTP)
meillo@0 27 RFC 1870 (ESMTP SIZE)
meillo@0 28 RFC 2197 (ESMTP PIPELINE)
meillo@0 29 RFC 2554 (ESMTP AUTH)
meillo@0 30 */
meillo@0 31
meillo@0 32 #ifdef ENABLE_SMTP_SERVER
meillo@0 33
meillo@10 34 smtp_cmd smtp_cmds[] = {
meillo@15 35 {SMTP_HELO, "HELO",},
meillo@15 36 {SMTP_EHLO, "EHLO",},
meillo@15 37 {SMTP_MAIL_FROM, "MAIL FROM:",},
meillo@15 38 {SMTP_RCPT_TO, "RCPT TO:",},
meillo@15 39 {SMTP_DATA, "DATA",},
meillo@15 40 {SMTP_QUIT, "QUIT",},
meillo@15 41 {SMTP_RSET, "RSET",},
meillo@15 42 {SMTP_NOOP, "NOOP",},
meillo@15 43 {SMTP_HELP, "HELP"},
meillo@0 44 };
meillo@0 45
meillo@10 46 static smtp_cmd_id
meillo@10 47 get_id(const gchar * line)
meillo@0 48 {
meillo@10 49 gint i;
meillo@10 50 for (i = 0; i < SMTP_NUM_IDS; i++) {
meillo@80 51 if (strncasecmp(smtp_cmds[i].cmd, line, strlen(smtp_cmds[i].cmd)) == 0) {
meillo@10 52 return (smtp_cmd_id) i;
meillo@80 53 }
meillo@10 54 }
meillo@10 55 return SMTP_ERROR;
meillo@0 56 }
meillo@0 57
meillo@117 58 static gboolean
meillo@117 59 get_size(gchar *line, unsigned long *msize) {
meillo@117 60 gchar *s = NULL;
meillo@117 61
meillo@117 62 /* hope we need not to handle cases like SiZe= ...*/
meillo@117 63 s = strstr(line, "SIZE=");
meillo@117 64 if (!s) {
meillo@117 65 /* try it in lowercase too */
meillo@117 66 if (!(s = strstr(line, "size="))) {
meillo@117 67 return FALSE;
meillo@117 68 }
meillo@117 69 }
meillo@117 70 s += 5;
meillo@117 71 *msize = atol(s);
meillo@117 72 DEBUG(5) debugf("get_size(): line=%s, msize=%ld\n", line, *msize);
meillo@117 73
meillo@117 74 return TRUE;
meillo@117 75 }
meillo@117 76
meillo@117 77
meillo@0 78 /* this is a quick hack: we expect the address to be syntactically correct
meillo@117 79 and containing the mailbox only, though we first check for size in
meillo@117 80 smtp_in().
meillo@136 81 Return false if address is too long.
meillo@0 82 */
meillo@10 83 static gboolean
meillo@10 84 get_address(gchar * line, gchar * addr)
meillo@0 85 {
meillo@80 86 gchar *p = line;
meillo@80 87 gchar *q = addr;
meillo@0 88
meillo@10 89 /* skip MAIL FROM: and RCPT TO: */
meillo@80 90 while (*p && (*p != ':')) {
meillo@10 91 p++;
meillo@80 92 }
meillo@10 93 p++;
meillo@0 94
meillo@10 95 /* skip spaces: */
meillo@80 96 while (*p && isspace(*p)) {
meillo@10 97 p++;
meillo@80 98 }
meillo@0 99
meillo@10 100 /* get address: */
meillo@136 101 while (*p && !isspace(*p)) {
meillo@136 102 if (q >= addr + MAX_ADDRESS-1) {
meillo@136 103 *q = '\0';
meillo@136 104 return FALSE;
meillo@136 105 }
meillo@10 106 *(q++) = *(p++);
meillo@80 107 }
meillo@136 108 *q = '\0';
meillo@0 109
meillo@10 110 return TRUE;
meillo@0 111 }
meillo@0 112
meillo@10 113 static smtp_connection*
meillo@10 114 create_base(gchar * remote_host)
meillo@0 115 {
meillo@10 116 smtp_connection *base = g_malloc(sizeof(smtp_connection));
meillo@80 117 if (!base) {
meillo@80 118 return NULL;
meillo@80 119 }
meillo@0 120
meillo@80 121 base->remote_host = g_strdup(remote_host);
meillo@0 122
meillo@80 123 base->prot = PROT_SMTP;
meillo@80 124 base->next_id = 0;
meillo@80 125 base->helo_seen = 0;
meillo@80 126 base->from_seen = 0;
meillo@80 127 base->rcpt_seen = 0;
meillo@80 128 base->msg = NULL;
meillo@80 129
meillo@80 130 return base;
meillo@0 131 }
meillo@0 132
meillo@10 133 static void
meillo@10 134 smtp_printf(FILE * out, gchar * fmt, ...)
meillo@0 135 {
meillo@10 136 va_list args;
meillo@10 137 va_start(args, fmt);
meillo@0 138
meillo@10 139 DEBUG(4) {
meillo@10 140 gchar buf[256];
meillo@10 141 va_list args_copy;
meillo@0 142
meillo@10 143 va_copy(args_copy, args);
meillo@10 144 vsnprintf(buf, 255, fmt, args_copy);
meillo@10 145 va_end(args_copy);
meillo@0 146
meillo@10 147 debugf(">>>%s", buf);
meillo@10 148 }
meillo@0 149
meillo@10 150 vfprintf(out, fmt, args);
meillo@10 151 fflush(out);
meillo@0 152
meillo@10 153 va_end(args);
meillo@0 154 }
meillo@0 155
meillo@10 156 void
meillo@10 157 smtp_in(FILE * in, FILE * out, gchar * remote_host, gchar * ident)
meillo@0 158 {
meillo@10 159 gchar *buffer;
meillo@10 160 smtp_cmd_id cmd_id;
meillo@10 161 message *msg = NULL;
meillo@10 162 smtp_connection *psc;
meillo@10 163 int len;
meillo@117 164 unsigned long size, msize;
meillo@0 165
meillo@10 166 DEBUG(5) debugf("smtp_in entered, remote_host = %s\n", remote_host);
meillo@0 167
meillo@10 168 psc = create_base(remote_host);
meillo@10 169 psc->msg = msg;
meillo@0 170
meillo@10 171 buffer = (gchar *) g_malloc(BUF_LEN);
meillo@80 172 if (!buffer) {
meillo@80 173 /* this check is actually unneccessary as g_malloc()
meillo@80 174 aborts on failure */
meillo@80 175 return;
meillo@80 176 }
meillo@0 177
meillo@80 178 /* send greeting string, containing ESMTP: */
meillo@80 179 smtp_printf(out, "220 %s MasqMail %s ESMTP\r\n", conf.host_name, VERSION);
meillo@10 180
meillo@80 181 while ((len = read_sockline(in, buffer, BUF_LEN, 5 * 60, READSOCKL_CHUG)) >= 0) {
meillo@80 182 cmd_id = get_id(buffer);
meillo@10 183
meillo@135 184 if (conf.defer_all) {
meillo@135 185 /* I need this to debug delivery failures */
meillo@127 186 smtp_printf(out, "421 %s service temporarily unavailable.\r\n", conf.host_name);
meillo@135 187 destroy_message(msg);
meillo@135 188 msg = NULL;
meillo@135 189 return;
meillo@127 190 }
meillo@127 191
meillo@80 192 switch (cmd_id) {
meillo@127 193 case SMTP_HELO:
meillo@127 194 psc->prot = PROT_SMTP;
meillo@127 195 psc->helo_seen = TRUE;
meillo@127 196 smtp_printf(out, "250 %s pretty old mailer, huh?\r\n", conf.host_name);
meillo@127 197 break;
meillo@127 198
meillo@80 199 case SMTP_EHLO:
meillo@80 200 psc->prot = PROT_ESMTP;
meillo@80 201 psc->helo_seen = TRUE;
meillo@127 202 smtp_printf(out, "250-%s Nice to meet you with ESMTP\r\n", conf.host_name);
meillo@127 203 smtp_printf(out, "250-SIZE %d\r\n", conf.max_msg_size);
meillo@127 204 smtp_printf(out, "250-PIPELINING\r\n");
meillo@127 205 smtp_printf(out, "250 HELP\r\n");
meillo@10 206 break;
meillo@80 207
meillo@80 208 case SMTP_MAIL_FROM:
meillo@80 209 {
meillo@80 210 gchar buf[MAX_ADDRESS];
meillo@80 211 address *addr;
meillo@80 212
meillo@80 213 if (!psc->helo_seen) {
meillo@80 214 smtp_printf(out, "503 need HELO or EHLO\r\n");
meillo@80 215 break;
meillo@80 216 }
meillo@80 217 if (psc->from_seen) {
meillo@80 218 smtp_printf(out, "503 MAIL FROM: already given.\r\n");
meillo@80 219 break;
meillo@80 220 }
meillo@128 221 if (get_size(buffer, &msize)) {
meillo@128 222 DEBUG(5) debugf("smtp_in(): get_size: msize=%ld, conf.mms=%d\n",
meillo@128 223 msize, conf.max_msg_size);
meillo@128 224 if (conf.max_msg_size && (msize > conf.max_msg_size)) {
meillo@128 225 smtp_printf(out, "552 Message size exceeds fixed limit.\r\n");
meillo@128 226 break;
meillo@128 227 }
meillo@128 228 }
meillo@136 229 if (!get_address(buffer, buf)) {
meillo@136 230 smtp_printf(out, "553 Address too long.\r\n");
meillo@136 231 break;
meillo@136 232 }
meillo@128 233
meillo@80 234 msg = create_message();
meillo@80 235 msg->received_host = remote_host ? g_strdup(remote_host) : NULL;
meillo@80 236 msg->received_prot = psc->prot;
meillo@80 237 msg->ident = ident ? g_strdup(ident) : NULL;
meillo@80 238 /* get transfer id and increment for next one */
meillo@80 239 msg->transfer_id = (psc->next_id)++;
meillo@80 240
meillo@80 241 if (remote_host) {
meillo@80 242 addr = create_address(buf, TRUE);
meillo@80 243 } else {
meillo@80 244 addr = create_address_qualified(buf, TRUE, conf.host_name);
meillo@80 245 }
meillo@80 246 if (!addr) {
meillo@80 247 smtp_printf(out, "501 %s: syntax error.\r\n", buf);
meillo@80 248 } else if (!addr->domain) {
meillo@80 249 smtp_printf(out, "501 return path must be qualified.\r\n", buf);
meillo@80 250 } else {
meillo@80 251 psc->from_seen = TRUE;
meillo@80 252 msg->return_path = addr;
meillo@80 253 smtp_printf(out, "250 OK %s is a nice guy.\r\n", addr->address);
meillo@80 254 }
meillo@80 255 }
meillo@10 256 break;
meillo@80 257
meillo@80 258 case SMTP_RCPT_TO:
meillo@80 259 {
meillo@80 260 char buf[MAX_ADDRESS];
meillo@80 261 address *addr;
meillo@80 262
meillo@80 263 if (!psc->helo_seen) {
meillo@80 264 smtp_printf(out, "503 need HELO or EHLO.\r\n");
meillo@80 265 break;
meillo@80 266 }
meillo@80 267 if (!psc->from_seen) {
meillo@80 268 smtp_printf(out, "503 need MAIL FROM: before RCPT TO:\r\n");
meillo@80 269 break;
meillo@80 270 }
meillo@136 271 if (!get_address(buffer, buf)) {
meillo@136 272 smtp_printf(out, "553 Address too long.\r\n");
meillo@136 273 break;
meillo@136 274 }
meillo@80 275
meillo@80 276 if (remote_host) {
meillo@80 277 addr = create_address(buf, TRUE);
meillo@80 278 } else {
meillo@80 279 addr = create_address_qualified(buf, TRUE, conf.host_name);
meillo@80 280 }
meillo@80 281 if (!addr) {
meillo@80 282 smtp_printf(out, "501 %s: syntax error in address.\r\n", buf);
meillo@80 283 break;
meillo@80 284 }
meillo@80 285 if (addr->local_part[0] == '|') {
meillo@80 286 smtp_printf(out, "501 %s: no pipe allowed for SMTP connections\r\n", buf);
meillo@80 287 break;
meillo@80 288 }
meillo@80 289 if (!addr->domain) {
meillo@80 290 smtp_printf(out, "501 recipient address must be qualified.\r\n", buf);
meillo@80 291 break;
meillo@80 292 }
meillo@80 293 gboolean do_relay = conf.do_relay;
meillo@80 294 if (!do_relay) {
meillo@80 295 do_relay = addr_is_local(msg->return_path);
meillo@80 296 if (!do_relay) {
meillo@80 297 do_relay = addr_is_local(addr);
meillo@80 298 }
meillo@80 299 }
meillo@80 300 if (!do_relay) {
meillo@80 301 smtp_printf(out, "550 relaying to %s denied.\r\n", addr_string(addr));
meillo@80 302 break;
meillo@80 303 }
meillo@80 304 psc->rcpt_seen = TRUE;
meillo@80 305 msg->rcpt_list = g_list_append(msg->rcpt_list, addr);
meillo@80 306 smtp_printf(out, "250 OK %s is our friend.\r\n", addr->address);
meillo@80 307 }
meillo@10 308 break;
meillo@80 309
meillo@80 310 case SMTP_DATA:
meillo@80 311 if (!psc->helo_seen) {
meillo@80 312 smtp_printf(out, "503 need HELO or EHLO.\r\n");
meillo@80 313 break;
meillo@80 314 }
meillo@80 315 if (!psc->rcpt_seen) {
meillo@80 316 smtp_printf(out, "503 need RCPT TO: before DATA\r\n");
meillo@80 317 break;
meillo@80 318 }
meillo@80 319 accept_error err;
meillo@80 320
meillo@80 321 smtp_printf(out, "354 okay, and do not forget the dot\r\n");
meillo@80 322
meillo@80 323 err = accept_message(in, msg, conf.do_save_envelope_to ? ACC_SAVE_ENVELOPE_TO : 0);
meillo@80 324 if (err != AERR_OK) {
meillo@117 325 switch (err) {
meillo@117 326 case AERR_TIMEOUT:
meillo@117 327 case AERR_EOF:
meillo@117 328 return;
meillo@117 329 case AERR_SIZE:
meillo@117 330 smtp_printf(out, "552 Error: message too large.\r\n");
meillo@117 331 return;
meillo@117 332 default:
meillo@117 333 /* should never happen: */
meillo@117 334 smtp_printf(out, "451 Unknown error\r\n");
meillo@80 335 return;
meillo@80 336 }
meillo@80 337 }
meillo@80 338
meillo@80 339
meillo@80 340 if (!spool_write(msg, TRUE)) {
meillo@80 341 smtp_printf(out, "451 Could not write spool file\r\n");
meillo@80 342 return;
meillo@80 343 }
meillo@80 344 pid_t pid;
meillo@80 345 smtp_printf(out, "250 OK id=%s\r\n", msg->uid);
meillo@80 346
meillo@80 347 if (remote_host != NULL) {
meillo@80 348 logwrite(LOG_NOTICE, "%s <= <%s@%s> host=%s with %s\n", msg->uid,
meillo@80 349 msg->return_path->local_part, msg->return_path->domain,
meillo@80 350 remote_host, prot_names[psc->prot]);
meillo@80 351 } else {
meillo@80 352 logwrite(LOG_NOTICE, "%s <= <%s@%s> with %s\n", msg->uid,
meillo@80 353 msg->return_path->local_part, msg->return_path->domain,
meillo@80 354 prot_names[psc->prot]);
meillo@80 355 }
meillo@80 356
meillo@80 357 if (conf.do_queue) {
meillo@80 358 DEBUG(1) debugf("queuing forced by configuration or option.\n");
meillo@80 359 } else {
meillo@80 360 pid = fork();
meillo@80 361 if (pid == 0) {
meillo@80 362 _exit(deliver(msg));
meillo@80 363 } else if (pid < 0) {
meillo@80 364 logwrite(LOG_ALERT, "could not fork for delivery, id = %s", msg->uid);
meillo@80 365 }
meillo@80 366 }
meillo@80 367 psc->rcpt_seen = psc->from_seen = FALSE;
meillo@80 368 destroy_message(msg);
meillo@80 369 msg = NULL;
meillo@80 370 break;
meillo@80 371
meillo@80 372 case SMTP_QUIT:
meillo@80 373 smtp_printf(out, "221 goodbye\r\n");
meillo@81 374 destroy_message(msg);
meillo@81 375 msg = NULL;
meillo@80 376 return;
meillo@80 377
meillo@80 378 case SMTP_RSET:
meillo@80 379 psc->from_seen = psc->rcpt_seen = FALSE;
meillo@81 380 destroy_message(msg);
meillo@81 381 msg = NULL;
meillo@80 382 smtp_printf(out, "250 OK\r\n");
meillo@80 383 break;
meillo@80 384
meillo@80 385 case SMTP_NOOP:
meillo@80 386 smtp_printf(out, "250 OK\r\n");
meillo@80 387 break;
meillo@80 388
meillo@80 389 case SMTP_HELP:
meillo@80 390 {
meillo@80 391 int i;
meillo@80 392
meillo@80 393 smtp_printf(out, "214-supported commands:\r\n");
meillo@80 394 for (i = 0; i < SMTP_NUM_IDS - 1; i++) {
meillo@80 395 smtp_printf(out, "214-%s\r\n", smtp_cmds[i].cmd);
meillo@80 396 }
meillo@80 397 smtp_printf(out, "214 %s\r\n", smtp_cmds[i].cmd);
meillo@80 398 }
meillo@80 399 break;
meillo@80 400
meillo@10 401 default:
meillo@80 402 smtp_printf(out, "501 command not recognized\r\n");
meillo@80 403 DEBUG(1) debugf("command not recognized, was '%s'\n", buffer);
meillo@10 404 break;
meillo@10 405 }
meillo@0 406 }
meillo@80 407 switch (len) {
meillo@80 408 case -3:
meillo@80 409 logwrite(LOG_NOTICE, "connection timed out\n");
meillo@80 410 break;
meillo@80 411 case -2:
meillo@80 412 logwrite(LOG_NOTICE, "line overflow\n");
meillo@80 413 break;
meillo@80 414 case -1:
meillo@80 415 logwrite(LOG_NOTICE, "received EOF\n");
meillo@80 416 break;
meillo@80 417 default:
meillo@80 418 break;
meillo@80 419 }
meillo@0 420 }
meillo@0 421 #endif