masqmail

annotate src/smtp_in.c @ 120:cd59a5b4d3dd

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added support for SMTP SIZE 0 (unlimited)
author meillo@marmaro.de
date Thu, 01 Jul 2010 13:30:30 +0200
parents 5ec5e6637049
children dabd4e706b78
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@80 179 switch (cmd_id) {
meillo@80 180 case SMTP_EHLO:
meillo@80 181 psc->prot = PROT_ESMTP;
meillo@80 182 /* fall through */
meillo@80 183 case SMTP_HELO:
meillo@80 184 psc->helo_seen = TRUE;
meillo@10 185
meillo@80 186 if (conf.defer_all) { /* I need this to debug delivery failures */
meillo@80 187 smtp_printf(out, "421 %s service temporarily unavailable.\r\n", conf.host_name);
meillo@10 188 break;
meillo@10 189 }
meillo@80 190
meillo@80 191 if (psc->prot == PROT_ESMTP) {
meillo@80 192 smtp_printf(out, "250-%s Nice to meet you with ESMTP\r\n", conf.host_name);
meillo@117 193 smtp_printf(out, "250-SIZE %d\r\n", conf.max_msg_size);
meillo@80 194 smtp_printf(out, "250-PIPELINING\r\n" "250 HELP\r\n");
meillo@80 195 } else {
meillo@80 196 smtp_printf(out, "250 %s pretty old mailer, huh?\r\n", conf.host_name);
meillo@80 197 }
meillo@10 198 break;
meillo@80 199
meillo@80 200 case SMTP_MAIL_FROM:
meillo@117 201 if (get_size(buffer, &msize)) {
meillo@117 202 DEBUG(5) debugf("smtp_in(): get_size: msize=%ld, conf.mms=%d\n",
meillo@117 203 msize, conf.max_msg_size);
meillo@120 204 if (conf.max_msg_size && (msize > conf.max_msg_size)) {
meillo@117 205 smtp_printf(out, "552 Message size exceeds fixed limit.\r\n");
meillo@117 206 break;
meillo@117 207 }
meillo@117 208 }
meillo@117 209
meillo@80 210 {
meillo@80 211 gchar buf[MAX_ADDRESS];
meillo@80 212 address *addr;
meillo@80 213
meillo@80 214 if (!psc->helo_seen) {
meillo@80 215 smtp_printf(out, "503 need HELO or EHLO\r\n");
meillo@80 216 break;
meillo@80 217 }
meillo@80 218 if (psc->from_seen) {
meillo@80 219 smtp_printf(out, "503 MAIL FROM: already given.\r\n");
meillo@80 220 break;
meillo@80 221 }
meillo@80 222
meillo@80 223 msg = create_message();
meillo@80 224 msg->received_host = remote_host ? g_strdup(remote_host) : NULL;
meillo@80 225 msg->received_prot = psc->prot;
meillo@80 226 msg->ident = ident ? g_strdup(ident) : NULL;
meillo@80 227 /* get transfer id and increment for next one */
meillo@80 228 msg->transfer_id = (psc->next_id)++;
meillo@80 229
meillo@80 230 get_address(buffer, buf);
meillo@80 231 if (remote_host) {
meillo@80 232 addr = create_address(buf, TRUE);
meillo@80 233 } else {
meillo@80 234 addr = create_address_qualified(buf, TRUE, conf.host_name);
meillo@80 235 }
meillo@80 236 if (!addr) {
meillo@80 237 smtp_printf(out, "501 %s: syntax error.\r\n", buf);
meillo@80 238 } else if (!addr->domain) {
meillo@80 239 smtp_printf(out, "501 return path must be qualified.\r\n", buf);
meillo@80 240 } else {
meillo@80 241 psc->from_seen = TRUE;
meillo@80 242 msg->return_path = addr;
meillo@80 243 smtp_printf(out, "250 OK %s is a nice guy.\r\n", addr->address);
meillo@80 244 }
meillo@80 245 }
meillo@10 246 break;
meillo@80 247
meillo@80 248 case SMTP_RCPT_TO:
meillo@80 249 {
meillo@80 250 char buf[MAX_ADDRESS];
meillo@80 251 address *addr;
meillo@80 252
meillo@80 253 if (!psc->helo_seen) {
meillo@80 254 smtp_printf(out, "503 need HELO or EHLO.\r\n");
meillo@80 255 break;
meillo@80 256 }
meillo@80 257 if (!psc->from_seen) {
meillo@80 258 smtp_printf(out, "503 need MAIL FROM: before RCPT TO:\r\n");
meillo@80 259 break;
meillo@80 260 }
meillo@80 261
meillo@80 262 get_address(buffer, buf);
meillo@80 263 if (remote_host) {
meillo@80 264 addr = create_address(buf, TRUE);
meillo@80 265 } else {
meillo@80 266 addr = create_address_qualified(buf, TRUE, conf.host_name);
meillo@80 267 }
meillo@80 268 if (!addr) {
meillo@80 269 smtp_printf(out, "501 %s: syntax error in address.\r\n", buf);
meillo@80 270 break;
meillo@80 271 }
meillo@80 272 if (addr->local_part[0] == '|') {
meillo@80 273 smtp_printf(out, "501 %s: no pipe allowed for SMTP connections\r\n", buf);
meillo@80 274 break;
meillo@80 275 }
meillo@80 276 if (!addr->domain) {
meillo@80 277 smtp_printf(out, "501 recipient address must be qualified.\r\n", buf);
meillo@80 278 break;
meillo@80 279 }
meillo@80 280 gboolean do_relay = conf.do_relay;
meillo@80 281 if (!do_relay) {
meillo@80 282 do_relay = addr_is_local(msg->return_path);
meillo@80 283 if (!do_relay) {
meillo@80 284 do_relay = addr_is_local(addr);
meillo@80 285 }
meillo@80 286 }
meillo@80 287 if (!do_relay) {
meillo@80 288 smtp_printf(out, "550 relaying to %s denied.\r\n", addr_string(addr));
meillo@80 289 break;
meillo@80 290 }
meillo@80 291 psc->rcpt_seen = TRUE;
meillo@80 292 msg->rcpt_list = g_list_append(msg->rcpt_list, addr);
meillo@80 293 smtp_printf(out, "250 OK %s is our friend.\r\n", addr->address);
meillo@80 294 }
meillo@10 295 break;
meillo@80 296
meillo@80 297 case SMTP_DATA:
meillo@80 298 if (!psc->helo_seen) {
meillo@80 299 smtp_printf(out, "503 need HELO or EHLO.\r\n");
meillo@80 300 break;
meillo@80 301 }
meillo@80 302 if (!psc->rcpt_seen) {
meillo@80 303 smtp_printf(out, "503 need RCPT TO: before DATA\r\n");
meillo@80 304 break;
meillo@80 305 }
meillo@80 306 accept_error err;
meillo@80 307
meillo@80 308 smtp_printf(out, "354 okay, and do not forget the dot\r\n");
meillo@80 309
meillo@80 310 err = accept_message(in, msg, conf.do_save_envelope_to ? ACC_SAVE_ENVELOPE_TO : 0);
meillo@80 311 if (err != AERR_OK) {
meillo@117 312 switch (err) {
meillo@117 313 case AERR_TIMEOUT:
meillo@117 314 case AERR_EOF:
meillo@117 315 return;
meillo@117 316 case AERR_SIZE:
meillo@117 317 smtp_printf(out, "552 Error: message too large.\r\n");
meillo@117 318 return;
meillo@117 319 default:
meillo@117 320 /* should never happen: */
meillo@117 321 smtp_printf(out, "451 Unknown error\r\n");
meillo@80 322 return;
meillo@80 323 }
meillo@80 324 }
meillo@80 325
meillo@80 326
meillo@80 327 if (!spool_write(msg, TRUE)) {
meillo@80 328 smtp_printf(out, "451 Could not write spool file\r\n");
meillo@80 329 return;
meillo@80 330 }
meillo@80 331 pid_t pid;
meillo@80 332 smtp_printf(out, "250 OK id=%s\r\n", msg->uid);
meillo@80 333
meillo@80 334 if (remote_host != NULL) {
meillo@80 335 logwrite(LOG_NOTICE, "%s <= <%s@%s> host=%s with %s\n", msg->uid,
meillo@80 336 msg->return_path->local_part, msg->return_path->domain,
meillo@80 337 remote_host, prot_names[psc->prot]);
meillo@80 338 } else {
meillo@80 339 logwrite(LOG_NOTICE, "%s <= <%s@%s> with %s\n", msg->uid,
meillo@80 340 msg->return_path->local_part, msg->return_path->domain,
meillo@80 341 prot_names[psc->prot]);
meillo@80 342 }
meillo@80 343
meillo@80 344 if (conf.do_queue) {
meillo@80 345 DEBUG(1) debugf("queuing forced by configuration or option.\n");
meillo@80 346 } else {
meillo@80 347 pid = fork();
meillo@80 348 if (pid == 0) {
meillo@80 349 _exit(deliver(msg));
meillo@80 350 } else if (pid < 0) {
meillo@80 351 logwrite(LOG_ALERT, "could not fork for delivery, id = %s", msg->uid);
meillo@80 352 }
meillo@80 353 }
meillo@80 354 psc->rcpt_seen = psc->from_seen = FALSE;
meillo@80 355 destroy_message(msg);
meillo@80 356 msg = NULL;
meillo@80 357 break;
meillo@80 358
meillo@80 359 case SMTP_QUIT:
meillo@80 360 smtp_printf(out, "221 goodbye\r\n");
meillo@81 361 destroy_message(msg);
meillo@81 362 msg = NULL;
meillo@80 363 return;
meillo@80 364
meillo@80 365 case SMTP_RSET:
meillo@80 366 psc->from_seen = psc->rcpt_seen = FALSE;
meillo@81 367 destroy_message(msg);
meillo@81 368 msg = NULL;
meillo@80 369 smtp_printf(out, "250 OK\r\n");
meillo@80 370 break;
meillo@80 371
meillo@80 372 case SMTP_NOOP:
meillo@80 373 smtp_printf(out, "250 OK\r\n");
meillo@80 374 break;
meillo@80 375
meillo@80 376 case SMTP_HELP:
meillo@80 377 {
meillo@80 378 int i;
meillo@80 379
meillo@80 380 smtp_printf(out, "214-supported commands:\r\n");
meillo@80 381 for (i = 0; i < SMTP_NUM_IDS - 1; i++) {
meillo@80 382 smtp_printf(out, "214-%s\r\n", smtp_cmds[i].cmd);
meillo@80 383 }
meillo@80 384 smtp_printf(out, "214 %s\r\n", smtp_cmds[i].cmd);
meillo@80 385 }
meillo@80 386 break;
meillo@80 387
meillo@10 388 default:
meillo@80 389 smtp_printf(out, "501 command not recognized\r\n");
meillo@80 390 DEBUG(1) debugf("command not recognized, was '%s'\n", buffer);
meillo@10 391 break;
meillo@10 392 }
meillo@0 393 }
meillo@80 394 switch (len) {
meillo@80 395 case -3:
meillo@80 396 logwrite(LOG_NOTICE, "connection timed out\n");
meillo@80 397 break;
meillo@80 398 case -2:
meillo@80 399 logwrite(LOG_NOTICE, "line overflow\n");
meillo@80 400 break;
meillo@80 401 case -1:
meillo@80 402 logwrite(LOG_NOTICE, "received EOF\n");
meillo@80 403 break;
meillo@80 404 default:
meillo@80 405 break;
meillo@80 406 }
meillo@0 407 }
meillo@0 408 #endif