masqmail

annotate src/smtp_in.c @ 432:ddc05e12e307

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Added tag 0.3.5 for changeset 34c919a8d74e
author markus schnalke <meillo@marmaro.de>
date Sat, 07 Feb 2015 11:36:09 +0100
parents b27f66555ba8
children
rev   line source
meillo@367 1 /*
meillo@367 2 ** MasqMail
meillo@367 3 ** Copyright (C) 1999-2001 Oliver Kurth
meillo@367 4 ** Copyright (C) 2010 markus schnalke <meillo@marmaro.de>
meillo@367 5 **
meillo@367 6 ** This program is free software; you can redistribute it and/or modify
meillo@367 7 ** it under the terms of the GNU General Public License as published by
meillo@367 8 ** the Free Software Foundation; either version 2 of the License, or
meillo@367 9 ** (at your option) any later version.
meillo@367 10 **
meillo@367 11 ** This program is distributed in the hope that it will be useful,
meillo@367 12 ** but WITHOUT ANY WARRANTY; without even the implied warranty of
meillo@367 13 ** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
meillo@367 14 ** GNU General Public License for more details.
meillo@367 15 **
meillo@367 16 ** You should have received a copy of the GNU General Public License
meillo@367 17 ** along with this program; if not, write to the Free Software
meillo@367 18 ** Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
meillo@0 19 */
meillo@0 20
meillo@0 21 #include "masqmail.h"
meillo@0 22 #include "readsock.h"
meillo@0 23
meillo@0 24 /*
meillo@367 25 ** I always forget these rfc numbers:
meillo@367 26 ** RFC 821 (SMTP)
meillo@367 27 ** RFC 1869 (ESMTP)
meillo@367 28 ** RFC 1870 (ESMTP SIZE)
meillo@367 29 ** RFC 2197 (ESMTP PIPELINE)
meillo@367 30 ** RFC 2554 (ESMTP AUTH)
meillo@0 31 */
meillo@0 32
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@366 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@367 78 /*
meillo@367 79 ** this is a quick hack: we expect the address to be syntactically correct
meillo@367 80 ** and containing the mailbox only, though we first check for size in
meillo@367 81 ** smtp_in().
meillo@367 82 ** Return false if address is too long.
meillo@0 83 */
meillo@10 84 static gboolean
meillo@366 85 get_address(gchar *line, gchar *addr)
meillo@0 86 {
meillo@80 87 gchar *p = line;
meillo@80 88 gchar *q = addr;
meillo@0 89
meillo@10 90 /* skip MAIL FROM: and RCPT TO: */
meillo@80 91 while (*p && (*p != ':')) {
meillo@10 92 p++;
meillo@80 93 }
meillo@10 94 p++;
meillo@0 95
meillo@10 96 /* skip spaces: */
meillo@80 97 while (*p && isspace(*p)) {
meillo@10 98 p++;
meillo@80 99 }
meillo@0 100
meillo@10 101 /* get address: */
meillo@136 102 while (*p && !isspace(*p)) {
meillo@136 103 if (q >= addr + MAX_ADDRESS-1) {
meillo@136 104 *q = '\0';
meillo@136 105 return FALSE;
meillo@136 106 }
meillo@10 107 *(q++) = *(p++);
meillo@80 108 }
meillo@136 109 *q = '\0';
meillo@0 110
meillo@10 111 return TRUE;
meillo@0 112 }
meillo@0 113
meillo@10 114 static smtp_connection*
meillo@366 115 create_base(gchar *remote_host)
meillo@0 116 {
meillo@10 117 smtp_connection *base = g_malloc(sizeof(smtp_connection));
meillo@80 118 if (!base) {
meillo@80 119 return NULL;
meillo@80 120 }
meillo@0 121
meillo@80 122 base->remote_host = g_strdup(remote_host);
meillo@0 123
meillo@80 124 base->prot = PROT_SMTP;
meillo@80 125 base->next_id = 0;
meillo@80 126 base->helo_seen = 0;
meillo@80 127 base->from_seen = 0;
meillo@80 128 base->rcpt_seen = 0;
meillo@80 129 base->msg = NULL;
meillo@80 130
meillo@80 131 return base;
meillo@0 132 }
meillo@0 133
meillo@10 134 static void
meillo@366 135 smtp_printf(FILE *out, gchar *fmt, ...)
meillo@0 136 {
meillo@10 137 va_list args;
meillo@10 138 va_start(args, fmt);
meillo@0 139
meillo@10 140 DEBUG(4) {
meillo@10 141 gchar buf[256];
meillo@10 142 va_list args_copy;
meillo@0 143
meillo@10 144 va_copy(args_copy, args);
meillo@10 145 vsnprintf(buf, 255, fmt, args_copy);
meillo@10 146 va_end(args_copy);
meillo@0 147
meillo@208 148 debugf(">>>%s\n", buf);
meillo@10 149 }
meillo@0 150
meillo@10 151 vfprintf(out, fmt, args);
meillo@10 152 fflush(out);
meillo@0 153
meillo@10 154 va_end(args);
meillo@0 155 }
meillo@0 156
meillo@10 157 void
meillo@366 158 smtp_in(FILE *in, FILE *out, gchar *remote_host, gchar *ident)
meillo@0 159 {
meillo@10 160 gchar *buffer;
meillo@10 161 smtp_cmd_id cmd_id;
meillo@10 162 message *msg = NULL;
meillo@10 163 smtp_connection *psc;
meillo@10 164 int len;
meillo@376 165 unsigned long msize;
meillo@0 166
meillo@10 167 DEBUG(5) debugf("smtp_in entered, remote_host = %s\n", remote_host);
meillo@0 168
meillo@10 169 psc = create_base(remote_host);
meillo@10 170 psc->msg = msg;
meillo@0 171
meillo@10 172 buffer = (gchar *) g_malloc(BUF_LEN);
meillo@80 173 if (!buffer) {
meillo@80 174 /* this check is actually unneccessary as g_malloc()
meillo@80 175 aborts on failure */
meillo@80 176 return;
meillo@80 177 }
meillo@0 178
meillo@80 179 /* send greeting string, containing ESMTP: */
meillo@80 180 smtp_printf(out, "220 %s MasqMail %s ESMTP\r\n", conf.host_name, VERSION);
meillo@10 181
meillo@80 182 while ((len = read_sockline(in, buffer, BUF_LEN, 5 * 60, READSOCKL_CHUG)) >= 0) {
meillo@80 183 cmd_id = get_id(buffer);
meillo@10 184
meillo@135 185 if (conf.defer_all) {
meillo@135 186 /* I need this to debug delivery failures */
meillo@127 187 smtp_printf(out, "421 %s service temporarily unavailable.\r\n", conf.host_name);
meillo@135 188 destroy_message(msg);
meillo@135 189 msg = NULL;
meillo@135 190 return;
meillo@127 191 }
meillo@127 192
meillo@80 193 switch (cmd_id) {
meillo@127 194 case SMTP_HELO:
meillo@127 195 psc->prot = PROT_SMTP;
meillo@127 196 psc->helo_seen = TRUE;
meillo@127 197 smtp_printf(out, "250 %s pretty old mailer, huh?\r\n", conf.host_name);
meillo@127 198 break;
meillo@127 199
meillo@80 200 case SMTP_EHLO:
meillo@80 201 psc->prot = PROT_ESMTP;
meillo@80 202 psc->helo_seen = TRUE;
meillo@127 203 smtp_printf(out, "250-%s Nice to meet you with ESMTP\r\n", conf.host_name);
meillo@127 204 smtp_printf(out, "250-SIZE %d\r\n", conf.max_msg_size);
meillo@127 205 smtp_printf(out, "250-PIPELINING\r\n");
meillo@127 206 smtp_printf(out, "250 HELP\r\n");
meillo@10 207 break;
meillo@80 208
meillo@80 209 case SMTP_MAIL_FROM:
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@128 222 if (get_size(buffer, &msize)) {
meillo@128 223 DEBUG(5) debugf("smtp_in(): get_size: msize=%ld, conf.mms=%d\n",
meillo@128 224 msize, conf.max_msg_size);
meillo@128 225 if (conf.max_msg_size && (msize > conf.max_msg_size)) {
meillo@128 226 smtp_printf(out, "552 Message size exceeds fixed limit.\r\n");
meillo@128 227 break;
meillo@128 228 }
meillo@128 229 }
meillo@136 230 if (!get_address(buffer, buf)) {
meillo@136 231 smtp_printf(out, "553 Address too long.\r\n");
meillo@136 232 break;
meillo@136 233 }
meillo@128 234
meillo@80 235 msg = create_message();
meillo@80 236 msg->received_host = remote_host ? g_strdup(remote_host) : NULL;
meillo@80 237 msg->received_prot = psc->prot;
meillo@80 238 msg->ident = ident ? g_strdup(ident) : NULL;
meillo@80 239 /* get transfer id and increment for next one */
meillo@80 240 msg->transfer_id = (psc->next_id)++;
meillo@80 241
meillo@80 242 if (remote_host) {
meillo@80 243 addr = create_address(buf, TRUE);
meillo@80 244 } else {
meillo@80 245 addr = create_address_qualified(buf, TRUE, conf.host_name);
meillo@80 246 }
meillo@80 247 if (!addr) {
meillo@80 248 smtp_printf(out, "501 %s: syntax error.\r\n", buf);
meillo@80 249 } else if (!addr->domain) {
meillo@80 250 smtp_printf(out, "501 return path must be qualified.\r\n", buf);
meillo@80 251 } else {
meillo@80 252 psc->from_seen = TRUE;
meillo@80 253 msg->return_path = addr;
meillo@80 254 smtp_printf(out, "250 OK %s is a nice guy.\r\n", addr->address);
meillo@80 255 }
meillo@80 256 }
meillo@10 257 break;
meillo@80 258
meillo@80 259 case SMTP_RCPT_TO:
meillo@80 260 {
meillo@80 261 char buf[MAX_ADDRESS];
meillo@80 262 address *addr;
meillo@80 263
meillo@80 264 if (!psc->helo_seen) {
meillo@80 265 smtp_printf(out, "503 need HELO or EHLO.\r\n");
meillo@80 266 break;
meillo@80 267 }
meillo@80 268 if (!psc->from_seen) {
meillo@80 269 smtp_printf(out, "503 need MAIL FROM: before RCPT TO:\r\n");
meillo@80 270 break;
meillo@80 271 }
meillo@136 272 if (!get_address(buffer, buf)) {
meillo@136 273 smtp_printf(out, "553 Address too long.\r\n");
meillo@136 274 break;
meillo@136 275 }
meillo@80 276
meillo@80 277 if (remote_host) {
meillo@80 278 addr = create_address(buf, TRUE);
meillo@80 279 } else {
meillo@80 280 addr = create_address_qualified(buf, TRUE, conf.host_name);
meillo@80 281 }
meillo@80 282 if (!addr) {
meillo@80 283 smtp_printf(out, "501 %s: syntax error in address.\r\n", buf);
meillo@80 284 break;
meillo@80 285 }
meillo@80 286 if (addr->local_part[0] == '|') {
meillo@80 287 smtp_printf(out, "501 %s: no pipe allowed for SMTP connections\r\n", buf);
meillo@80 288 break;
meillo@80 289 }
meillo@80 290 if (!addr->domain) {
meillo@305 291 /* TODO: ``postmaster'' may be unqualified */
meillo@80 292 smtp_printf(out, "501 recipient address must be qualified.\r\n", buf);
meillo@80 293 break;
meillo@80 294 }
meillo@305 295 if (!(conf.do_relay || addr_is_local(msg->return_path) || addr_is_local(addr))) {
meillo@80 296 smtp_printf(out, "550 relaying to %s denied.\r\n", addr_string(addr));
meillo@80 297 break;
meillo@80 298 }
meillo@80 299 psc->rcpt_seen = TRUE;
meillo@80 300 msg->rcpt_list = g_list_append(msg->rcpt_list, addr);
meillo@80 301 smtp_printf(out, "250 OK %s is our friend.\r\n", addr->address);
meillo@80 302 }
meillo@10 303 break;
meillo@80 304
meillo@80 305 case SMTP_DATA:
meillo@80 306 if (!psc->helo_seen) {
meillo@80 307 smtp_printf(out, "503 need HELO or EHLO.\r\n");
meillo@80 308 break;
meillo@80 309 }
meillo@80 310 if (!psc->rcpt_seen) {
meillo@80 311 smtp_printf(out, "503 need RCPT TO: before DATA\r\n");
meillo@80 312 break;
meillo@80 313 }
meillo@80 314 accept_error err;
meillo@80 315
meillo@80 316 smtp_printf(out, "354 okay, and do not forget the dot\r\n");
meillo@80 317
meillo@80 318 err = accept_message(in, msg, conf.do_save_envelope_to ? ACC_SAVE_ENVELOPE_TO : 0);
meillo@80 319 if (err != AERR_OK) {
meillo@117 320 switch (err) {
meillo@117 321 case AERR_TIMEOUT:
meillo@117 322 case AERR_EOF:
meillo@117 323 return;
meillo@117 324 case AERR_SIZE:
meillo@117 325 smtp_printf(out, "552 Error: message too large.\r\n");
meillo@117 326 return;
meillo@117 327 default:
meillo@117 328 /* should never happen: */
meillo@117 329 smtp_printf(out, "451 Unknown error\r\n");
meillo@80 330 return;
meillo@80 331 }
meillo@80 332 }
meillo@80 333
meillo@80 334
meillo@80 335 if (!spool_write(msg, TRUE)) {
meillo@80 336 smtp_printf(out, "451 Could not write spool file\r\n");
meillo@80 337 return;
meillo@80 338 }
meillo@80 339 pid_t pid;
meillo@80 340 smtp_printf(out, "250 OK id=%s\r\n", msg->uid);
meillo@80 341
meillo@80 342 if (remote_host != NULL) {
meillo@80 343 logwrite(LOG_NOTICE, "%s <= <%s@%s> host=%s with %s\n", msg->uid,
meillo@80 344 msg->return_path->local_part, msg->return_path->domain,
meillo@80 345 remote_host, prot_names[psc->prot]);
meillo@80 346 } else {
meillo@80 347 logwrite(LOG_NOTICE, "%s <= <%s@%s> with %s\n", msg->uid,
meillo@80 348 msg->return_path->local_part, msg->return_path->domain,
meillo@80 349 prot_names[psc->prot]);
meillo@80 350 }
meillo@80 351
meillo@80 352 if (conf.do_queue) {
meillo@80 353 DEBUG(1) debugf("queuing forced by configuration or option.\n");
meillo@80 354 } else {
meillo@80 355 pid = fork();
meillo@347 356 if (pid < 0) {
meillo@347 357 logwrite(LOG_ALERT, "could not fork for delivery, id = %s\n", msg->uid);
meillo@347 358 } else if (pid == 0) {
meillo@347 359 /* FIXME: most likely inverted exit code */
meillo@80 360 _exit(deliver(msg));
meillo@80 361 }
meillo@80 362 }
meillo@80 363 psc->rcpt_seen = psc->from_seen = FALSE;
meillo@80 364 destroy_message(msg);
meillo@80 365 msg = NULL;
meillo@80 366 break;
meillo@80 367
meillo@80 368 case SMTP_QUIT:
meillo@80 369 smtp_printf(out, "221 goodbye\r\n");
meillo@81 370 destroy_message(msg);
meillo@81 371 msg = NULL;
meillo@80 372 return;
meillo@80 373
meillo@80 374 case SMTP_RSET:
meillo@80 375 psc->from_seen = psc->rcpt_seen = FALSE;
meillo@81 376 destroy_message(msg);
meillo@81 377 msg = NULL;
meillo@80 378 smtp_printf(out, "250 OK\r\n");
meillo@80 379 break;
meillo@80 380
meillo@80 381 case SMTP_NOOP:
meillo@80 382 smtp_printf(out, "250 OK\r\n");
meillo@80 383 break;
meillo@80 384
meillo@80 385 case SMTP_HELP:
meillo@80 386 {
meillo@80 387 int i;
meillo@80 388
meillo@80 389 smtp_printf(out, "214-supported commands:\r\n");
meillo@80 390 for (i = 0; i < SMTP_NUM_IDS - 1; i++) {
meillo@80 391 smtp_printf(out, "214-%s\r\n", smtp_cmds[i].cmd);
meillo@80 392 }
meillo@80 393 smtp_printf(out, "214 %s\r\n", smtp_cmds[i].cmd);
meillo@80 394 }
meillo@80 395 break;
meillo@80 396
meillo@10 397 default:
meillo@80 398 smtp_printf(out, "501 command not recognized\r\n");
meillo@80 399 DEBUG(1) debugf("command not recognized, was '%s'\n", buffer);
meillo@10 400 break;
meillo@10 401 }
meillo@0 402 }
meillo@80 403 switch (len) {
meillo@80 404 case -3:
meillo@80 405 logwrite(LOG_NOTICE, "connection timed out\n");
meillo@80 406 break;
meillo@80 407 case -2:
meillo@80 408 logwrite(LOG_NOTICE, "line overflow\n");
meillo@80 409 break;
meillo@80 410 case -1:
meillo@80 411 logwrite(LOG_NOTICE, "received EOF\n");
meillo@80 412 break;
meillo@80 413 default:
meillo@80 414 break;
meillo@80 415 }
meillo@0 416 }