masqmail

annotate src/smtp_in.c @ 135:b072426cc6bb

find changesets by author, revision, files, or words in the commit message
fixed defer_all code it was broken during refactoring this morning
author meillo@marmaro.de
date Tue, 06 Jul 2010 13:46:51 +0200
parents f9d5469cb648
children 6b78aaced5e1
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@0 81 */
meillo@10 82 static gboolean
meillo@10 83 get_address(gchar * line, gchar * addr)
meillo@0 84 {
meillo@80 85 gchar *p = line;
meillo@80 86 gchar *q = addr;
meillo@0 87
meillo@10 88 /* skip MAIL FROM: and RCPT TO: */
meillo@80 89 while (*p && (*p != ':')) {
meillo@10 90 p++;
meillo@80 91 }
meillo@10 92 p++;
meillo@0 93
meillo@10 94 /* skip spaces: */
meillo@80 95 while (*p && isspace(*p)) {
meillo@10 96 p++;
meillo@80 97 }
meillo@0 98
meillo@10 99 /* get address: */
meillo@80 100 while (*p && !isspace(*p) && (q < addr + MAX_ADDRESS - 1)) {
meillo@10 101 *(q++) = *(p++);
meillo@80 102 }
meillo@10 103 *q = 0;
meillo@0 104
meillo@10 105 return TRUE;
meillo@0 106 }
meillo@0 107
meillo@10 108 static smtp_connection*
meillo@10 109 create_base(gchar * remote_host)
meillo@0 110 {
meillo@10 111 smtp_connection *base = g_malloc(sizeof(smtp_connection));
meillo@80 112 if (!base) {
meillo@80 113 return NULL;
meillo@80 114 }
meillo@0 115
meillo@80 116 base->remote_host = g_strdup(remote_host);
meillo@0 117
meillo@80 118 base->prot = PROT_SMTP;
meillo@80 119 base->next_id = 0;
meillo@80 120 base->helo_seen = 0;
meillo@80 121 base->from_seen = 0;
meillo@80 122 base->rcpt_seen = 0;
meillo@80 123 base->msg = NULL;
meillo@80 124
meillo@80 125 return base;
meillo@0 126 }
meillo@0 127
meillo@10 128 static void
meillo@10 129 smtp_printf(FILE * out, gchar * fmt, ...)
meillo@0 130 {
meillo@10 131 va_list args;
meillo@10 132 va_start(args, fmt);
meillo@0 133
meillo@10 134 DEBUG(4) {
meillo@10 135 gchar buf[256];
meillo@10 136 va_list args_copy;
meillo@0 137
meillo@10 138 va_copy(args_copy, args);
meillo@10 139 vsnprintf(buf, 255, fmt, args_copy);
meillo@10 140 va_end(args_copy);
meillo@0 141
meillo@10 142 debugf(">>>%s", buf);
meillo@10 143 }
meillo@0 144
meillo@10 145 vfprintf(out, fmt, args);
meillo@10 146 fflush(out);
meillo@0 147
meillo@10 148 va_end(args);
meillo@0 149 }
meillo@0 150
meillo@10 151 void
meillo@10 152 smtp_in(FILE * in, FILE * out, gchar * remote_host, gchar * ident)
meillo@0 153 {
meillo@10 154 gchar *buffer;
meillo@10 155 smtp_cmd_id cmd_id;
meillo@10 156 message *msg = NULL;
meillo@10 157 smtp_connection *psc;
meillo@10 158 int len;
meillo@117 159 unsigned long size, msize;
meillo@0 160
meillo@10 161 DEBUG(5) debugf("smtp_in entered, remote_host = %s\n", remote_host);
meillo@0 162
meillo@10 163 psc = create_base(remote_host);
meillo@10 164 psc->msg = msg;
meillo@0 165
meillo@10 166 buffer = (gchar *) g_malloc(BUF_LEN);
meillo@80 167 if (!buffer) {
meillo@80 168 /* this check is actually unneccessary as g_malloc()
meillo@80 169 aborts on failure */
meillo@80 170 return;
meillo@80 171 }
meillo@0 172
meillo@80 173 /* send greeting string, containing ESMTP: */
meillo@80 174 smtp_printf(out, "220 %s MasqMail %s ESMTP\r\n", conf.host_name, VERSION);
meillo@10 175
meillo@80 176 while ((len = read_sockline(in, buffer, BUF_LEN, 5 * 60, READSOCKL_CHUG)) >= 0) {
meillo@80 177 cmd_id = get_id(buffer);
meillo@10 178
meillo@135 179 if (conf.defer_all) {
meillo@135 180 /* I need this to debug delivery failures */
meillo@127 181 smtp_printf(out, "421 %s service temporarily unavailable.\r\n", conf.host_name);
meillo@135 182 destroy_message(msg);
meillo@135 183 msg = NULL;
meillo@135 184 return;
meillo@127 185 }
meillo@127 186
meillo@80 187 switch (cmd_id) {
meillo@127 188 case SMTP_HELO:
meillo@127 189 psc->prot = PROT_SMTP;
meillo@127 190 psc->helo_seen = TRUE;
meillo@127 191 smtp_printf(out, "250 %s pretty old mailer, huh?\r\n", conf.host_name);
meillo@127 192 break;
meillo@127 193
meillo@80 194 case SMTP_EHLO:
meillo@80 195 psc->prot = PROT_ESMTP;
meillo@80 196 psc->helo_seen = TRUE;
meillo@127 197 smtp_printf(out, "250-%s Nice to meet you with ESMTP\r\n", conf.host_name);
meillo@127 198 smtp_printf(out, "250-SIZE %d\r\n", conf.max_msg_size);
meillo@127 199 smtp_printf(out, "250-PIPELINING\r\n");
meillo@127 200 smtp_printf(out, "250 HELP\r\n");
meillo@10 201 break;
meillo@80 202
meillo@80 203 case SMTP_MAIL_FROM:
meillo@80 204 {
meillo@80 205 gchar buf[MAX_ADDRESS];
meillo@80 206 address *addr;
meillo@80 207
meillo@80 208 if (!psc->helo_seen) {
meillo@80 209 smtp_printf(out, "503 need HELO or EHLO\r\n");
meillo@80 210 break;
meillo@80 211 }
meillo@80 212 if (psc->from_seen) {
meillo@80 213 smtp_printf(out, "503 MAIL FROM: already given.\r\n");
meillo@80 214 break;
meillo@80 215 }
meillo@127 216
meillo@128 217 if (get_size(buffer, &msize)) {
meillo@128 218 DEBUG(5) debugf("smtp_in(): get_size: msize=%ld, conf.mms=%d\n",
meillo@128 219 msize, conf.max_msg_size);
meillo@128 220 if (conf.max_msg_size && (msize > conf.max_msg_size)) {
meillo@128 221 smtp_printf(out, "552 Message size exceeds fixed limit.\r\n");
meillo@128 222 break;
meillo@128 223 }
meillo@128 224 }
meillo@128 225
meillo@80 226 msg = create_message();
meillo@80 227 msg->received_host = remote_host ? g_strdup(remote_host) : NULL;
meillo@80 228 msg->received_prot = psc->prot;
meillo@80 229 msg->ident = ident ? g_strdup(ident) : NULL;
meillo@80 230 /* get transfer id and increment for next one */
meillo@80 231 msg->transfer_id = (psc->next_id)++;
meillo@80 232
meillo@80 233 get_address(buffer, buf);
meillo@80 234 if (remote_host) {
meillo@80 235 addr = create_address(buf, TRUE);
meillo@80 236 } else {
meillo@80 237 addr = create_address_qualified(buf, TRUE, conf.host_name);
meillo@80 238 }
meillo@80 239 if (!addr) {
meillo@80 240 smtp_printf(out, "501 %s: syntax error.\r\n", buf);
meillo@80 241 } else if (!addr->domain) {
meillo@80 242 smtp_printf(out, "501 return path must be qualified.\r\n", buf);
meillo@80 243 } else {
meillo@80 244 psc->from_seen = TRUE;
meillo@80 245 msg->return_path = addr;
meillo@80 246 smtp_printf(out, "250 OK %s is a nice guy.\r\n", addr->address);
meillo@80 247 }
meillo@80 248 }
meillo@10 249 break;
meillo@80 250
meillo@80 251 case SMTP_RCPT_TO:
meillo@80 252 {
meillo@80 253 char buf[MAX_ADDRESS];
meillo@80 254 address *addr;
meillo@80 255
meillo@80 256 if (!psc->helo_seen) {
meillo@80 257 smtp_printf(out, "503 need HELO or EHLO.\r\n");
meillo@80 258 break;
meillo@80 259 }
meillo@80 260 if (!psc->from_seen) {
meillo@80 261 smtp_printf(out, "503 need MAIL FROM: before RCPT TO:\r\n");
meillo@80 262 break;
meillo@80 263 }
meillo@80 264
meillo@80 265 get_address(buffer, buf);
meillo@80 266 if (remote_host) {
meillo@80 267 addr = create_address(buf, TRUE);
meillo@80 268 } else {
meillo@80 269 addr = create_address_qualified(buf, TRUE, conf.host_name);
meillo@80 270 }
meillo@80 271 if (!addr) {
meillo@80 272 smtp_printf(out, "501 %s: syntax error in address.\r\n", buf);
meillo@80 273 break;
meillo@80 274 }
meillo@80 275 if (addr->local_part[0] == '|') {
meillo@80 276 smtp_printf(out, "501 %s: no pipe allowed for SMTP connections\r\n", buf);
meillo@80 277 break;
meillo@80 278 }
meillo@80 279 if (!addr->domain) {
meillo@80 280 smtp_printf(out, "501 recipient address must be qualified.\r\n", buf);
meillo@80 281 break;
meillo@80 282 }
meillo@80 283 gboolean do_relay = conf.do_relay;
meillo@80 284 if (!do_relay) {
meillo@80 285 do_relay = addr_is_local(msg->return_path);
meillo@80 286 if (!do_relay) {
meillo@80 287 do_relay = addr_is_local(addr);
meillo@80 288 }
meillo@80 289 }
meillo@80 290 if (!do_relay) {
meillo@80 291 smtp_printf(out, "550 relaying to %s denied.\r\n", addr_string(addr));
meillo@80 292 break;
meillo@80 293 }
meillo@80 294 psc->rcpt_seen = TRUE;
meillo@80 295 msg->rcpt_list = g_list_append(msg->rcpt_list, addr);
meillo@80 296 smtp_printf(out, "250 OK %s is our friend.\r\n", addr->address);
meillo@80 297 }
meillo@10 298 break;
meillo@80 299
meillo@80 300 case SMTP_DATA:
meillo@80 301 if (!psc->helo_seen) {
meillo@80 302 smtp_printf(out, "503 need HELO or EHLO.\r\n");
meillo@80 303 break;
meillo@80 304 }
meillo@80 305 if (!psc->rcpt_seen) {
meillo@80 306 smtp_printf(out, "503 need RCPT TO: before DATA\r\n");
meillo@80 307 break;
meillo@80 308 }
meillo@80 309 accept_error err;
meillo@80 310
meillo@80 311 smtp_printf(out, "354 okay, and do not forget the dot\r\n");
meillo@80 312
meillo@80 313 err = accept_message(in, msg, conf.do_save_envelope_to ? ACC_SAVE_ENVELOPE_TO : 0);
meillo@80 314 if (err != AERR_OK) {
meillo@117 315 switch (err) {
meillo@117 316 case AERR_TIMEOUT:
meillo@117 317 case AERR_EOF:
meillo@117 318 return;
meillo@117 319 case AERR_SIZE:
meillo@117 320 smtp_printf(out, "552 Error: message too large.\r\n");
meillo@117 321 return;
meillo@117 322 default:
meillo@117 323 /* should never happen: */
meillo@117 324 smtp_printf(out, "451 Unknown error\r\n");
meillo@80 325 return;
meillo@80 326 }
meillo@80 327 }
meillo@80 328
meillo@80 329
meillo@80 330 if (!spool_write(msg, TRUE)) {
meillo@80 331 smtp_printf(out, "451 Could not write spool file\r\n");
meillo@80 332 return;
meillo@80 333 }
meillo@80 334 pid_t pid;
meillo@80 335 smtp_printf(out, "250 OK id=%s\r\n", msg->uid);
meillo@80 336
meillo@80 337 if (remote_host != NULL) {
meillo@80 338 logwrite(LOG_NOTICE, "%s <= <%s@%s> host=%s with %s\n", msg->uid,
meillo@80 339 msg->return_path->local_part, msg->return_path->domain,
meillo@80 340 remote_host, prot_names[psc->prot]);
meillo@80 341 } else {
meillo@80 342 logwrite(LOG_NOTICE, "%s <= <%s@%s> with %s\n", msg->uid,
meillo@80 343 msg->return_path->local_part, msg->return_path->domain,
meillo@80 344 prot_names[psc->prot]);
meillo@80 345 }
meillo@80 346
meillo@80 347 if (conf.do_queue) {
meillo@80 348 DEBUG(1) debugf("queuing forced by configuration or option.\n");
meillo@80 349 } else {
meillo@80 350 pid = fork();
meillo@80 351 if (pid == 0) {
meillo@80 352 _exit(deliver(msg));
meillo@80 353 } else if (pid < 0) {
meillo@80 354 logwrite(LOG_ALERT, "could not fork for delivery, id = %s", msg->uid);
meillo@80 355 }
meillo@80 356 }
meillo@80 357 psc->rcpt_seen = psc->from_seen = FALSE;
meillo@80 358 destroy_message(msg);
meillo@80 359 msg = NULL;
meillo@80 360 break;
meillo@80 361
meillo@80 362 case SMTP_QUIT:
meillo@80 363 smtp_printf(out, "221 goodbye\r\n");
meillo@81 364 destroy_message(msg);
meillo@81 365 msg = NULL;
meillo@80 366 return;
meillo@80 367
meillo@80 368 case SMTP_RSET:
meillo@80 369 psc->from_seen = psc->rcpt_seen = FALSE;
meillo@81 370 destroy_message(msg);
meillo@81 371 msg = NULL;
meillo@80 372 smtp_printf(out, "250 OK\r\n");
meillo@80 373 break;
meillo@80 374
meillo@80 375 case SMTP_NOOP:
meillo@80 376 smtp_printf(out, "250 OK\r\n");
meillo@80 377 break;
meillo@80 378
meillo@80 379 case SMTP_HELP:
meillo@80 380 {
meillo@80 381 int i;
meillo@80 382
meillo@80 383 smtp_printf(out, "214-supported commands:\r\n");
meillo@80 384 for (i = 0; i < SMTP_NUM_IDS - 1; i++) {
meillo@80 385 smtp_printf(out, "214-%s\r\n", smtp_cmds[i].cmd);
meillo@80 386 }
meillo@80 387 smtp_printf(out, "214 %s\r\n", smtp_cmds[i].cmd);
meillo@80 388 }
meillo@80 389 break;
meillo@80 390
meillo@10 391 default:
meillo@80 392 smtp_printf(out, "501 command not recognized\r\n");
meillo@80 393 DEBUG(1) debugf("command not recognized, was '%s'\n", buffer);
meillo@10 394 break;
meillo@10 395 }
meillo@0 396 }
meillo@80 397 switch (len) {
meillo@80 398 case -3:
meillo@80 399 logwrite(LOG_NOTICE, "connection timed out\n");
meillo@80 400 break;
meillo@80 401 case -2:
meillo@80 402 logwrite(LOG_NOTICE, "line overflow\n");
meillo@80 403 break;
meillo@80 404 case -1:
meillo@80 405 logwrite(LOG_NOTICE, "received EOF\n");
meillo@80 406 break;
meillo@80 407 default:
meillo@80 408 break;
meillo@80 409 }
meillo@0 410 }
meillo@0 411 #endif