masqmail

annotate src/smtp_in.c @ 321:412385b57dc4

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refactoring
author meillo@marmaro.de
date Thu, 28 Apr 2011 16:48:23 +0200
parents 3708b655a371
children 53cf6be5843a
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
meillo@10 33 smtp_cmd smtp_cmds[] = {
meillo@15 34 {SMTP_HELO, "HELO",},
meillo@15 35 {SMTP_EHLO, "EHLO",},
meillo@15 36 {SMTP_MAIL_FROM, "MAIL FROM:",},
meillo@15 37 {SMTP_RCPT_TO, "RCPT TO:",},
meillo@15 38 {SMTP_DATA, "DATA",},
meillo@15 39 {SMTP_QUIT, "QUIT",},
meillo@15 40 {SMTP_RSET, "RSET",},
meillo@15 41 {SMTP_NOOP, "NOOP",},
meillo@15 42 {SMTP_HELP, "HELP"},
meillo@0 43 };
meillo@0 44
meillo@10 45 static smtp_cmd_id
meillo@10 46 get_id(const gchar * line)
meillo@0 47 {
meillo@10 48 gint i;
meillo@10 49 for (i = 0; i < SMTP_NUM_IDS; i++) {
meillo@80 50 if (strncasecmp(smtp_cmds[i].cmd, line, strlen(smtp_cmds[i].cmd)) == 0) {
meillo@10 51 return (smtp_cmd_id) i;
meillo@80 52 }
meillo@10 53 }
meillo@10 54 return SMTP_ERROR;
meillo@0 55 }
meillo@0 56
meillo@117 57 static gboolean
meillo@117 58 get_size(gchar *line, unsigned long *msize) {
meillo@117 59 gchar *s = NULL;
meillo@117 60
meillo@117 61 /* hope we need not to handle cases like SiZe= ...*/
meillo@117 62 s = strstr(line, "SIZE=");
meillo@117 63 if (!s) {
meillo@117 64 /* try it in lowercase too */
meillo@117 65 if (!(s = strstr(line, "size="))) {
meillo@117 66 return FALSE;
meillo@117 67 }
meillo@117 68 }
meillo@117 69 s += 5;
meillo@117 70 *msize = atol(s);
meillo@117 71 DEBUG(5) debugf("get_size(): line=%s, msize=%ld\n", line, *msize);
meillo@117 72
meillo@117 73 return TRUE;
meillo@117 74 }
meillo@117 75
meillo@117 76
meillo@0 77 /* this is a quick hack: we expect the address to be syntactically correct
meillo@117 78 and containing the mailbox only, though we first check for size in
meillo@117 79 smtp_in().
meillo@136 80 Return false if address is too long.
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@136 100 while (*p && !isspace(*p)) {
meillo@136 101 if (q >= addr + MAX_ADDRESS-1) {
meillo@136 102 *q = '\0';
meillo@136 103 return FALSE;
meillo@136 104 }
meillo@10 105 *(q++) = *(p++);
meillo@80 106 }
meillo@136 107 *q = '\0';
meillo@0 108
meillo@10 109 return TRUE;
meillo@0 110 }
meillo@0 111
meillo@10 112 static smtp_connection*
meillo@10 113 create_base(gchar * remote_host)
meillo@0 114 {
meillo@10 115 smtp_connection *base = g_malloc(sizeof(smtp_connection));
meillo@80 116 if (!base) {
meillo@80 117 return NULL;
meillo@80 118 }
meillo@0 119
meillo@80 120 base->remote_host = g_strdup(remote_host);
meillo@0 121
meillo@80 122 base->prot = PROT_SMTP;
meillo@80 123 base->next_id = 0;
meillo@80 124 base->helo_seen = 0;
meillo@80 125 base->from_seen = 0;
meillo@80 126 base->rcpt_seen = 0;
meillo@80 127 base->msg = NULL;
meillo@80 128
meillo@80 129 return base;
meillo@0 130 }
meillo@0 131
meillo@10 132 static void
meillo@10 133 smtp_printf(FILE * out, gchar * fmt, ...)
meillo@0 134 {
meillo@10 135 va_list args;
meillo@10 136 va_start(args, fmt);
meillo@0 137
meillo@10 138 DEBUG(4) {
meillo@10 139 gchar buf[256];
meillo@10 140 va_list args_copy;
meillo@0 141
meillo@10 142 va_copy(args_copy, args);
meillo@10 143 vsnprintf(buf, 255, fmt, args_copy);
meillo@10 144 va_end(args_copy);
meillo@0 145
meillo@208 146 debugf(">>>%s\n", buf);
meillo@10 147 }
meillo@0 148
meillo@10 149 vfprintf(out, fmt, args);
meillo@10 150 fflush(out);
meillo@0 151
meillo@10 152 va_end(args);
meillo@0 153 }
meillo@0 154
meillo@10 155 void
meillo@10 156 smtp_in(FILE * in, FILE * out, gchar * remote_host, gchar * ident)
meillo@0 157 {
meillo@10 158 gchar *buffer;
meillo@10 159 smtp_cmd_id cmd_id;
meillo@10 160 message *msg = NULL;
meillo@10 161 smtp_connection *psc;
meillo@10 162 int len;
meillo@117 163 unsigned long size, msize;
meillo@0 164
meillo@10 165 DEBUG(5) debugf("smtp_in entered, remote_host = %s\n", remote_host);
meillo@0 166
meillo@10 167 psc = create_base(remote_host);
meillo@10 168 psc->msg = msg;
meillo@0 169
meillo@10 170 buffer = (gchar *) g_malloc(BUF_LEN);
meillo@80 171 if (!buffer) {
meillo@80 172 /* this check is actually unneccessary as g_malloc()
meillo@80 173 aborts on failure */
meillo@80 174 return;
meillo@80 175 }
meillo@0 176
meillo@80 177 /* send greeting string, containing ESMTP: */
meillo@80 178 smtp_printf(out, "220 %s MasqMail %s ESMTP\r\n", conf.host_name, VERSION);
meillo@10 179
meillo@80 180 while ((len = read_sockline(in, buffer, BUF_LEN, 5 * 60, READSOCKL_CHUG)) >= 0) {
meillo@80 181 cmd_id = get_id(buffer);
meillo@10 182
meillo@135 183 if (conf.defer_all) {
meillo@135 184 /* I need this to debug delivery failures */
meillo@127 185 smtp_printf(out, "421 %s service temporarily unavailable.\r\n", conf.host_name);
meillo@135 186 destroy_message(msg);
meillo@135 187 msg = NULL;
meillo@135 188 return;
meillo@127 189 }
meillo@127 190
meillo@80 191 switch (cmd_id) {
meillo@127 192 case SMTP_HELO:
meillo@127 193 psc->prot = PROT_SMTP;
meillo@127 194 psc->helo_seen = TRUE;
meillo@127 195 smtp_printf(out, "250 %s pretty old mailer, huh?\r\n", conf.host_name);
meillo@127 196 break;
meillo@127 197
meillo@80 198 case SMTP_EHLO:
meillo@80 199 psc->prot = PROT_ESMTP;
meillo@80 200 psc->helo_seen = TRUE;
meillo@127 201 smtp_printf(out, "250-%s Nice to meet you with ESMTP\r\n", conf.host_name);
meillo@127 202 smtp_printf(out, "250-SIZE %d\r\n", conf.max_msg_size);
meillo@127 203 smtp_printf(out, "250-PIPELINING\r\n");
meillo@127 204 smtp_printf(out, "250 HELP\r\n");
meillo@10 205 break;
meillo@80 206
meillo@80 207 case SMTP_MAIL_FROM:
meillo@80 208 {
meillo@80 209 gchar buf[MAX_ADDRESS];
meillo@80 210 address *addr;
meillo@80 211
meillo@80 212 if (!psc->helo_seen) {
meillo@80 213 smtp_printf(out, "503 need HELO or EHLO\r\n");
meillo@80 214 break;
meillo@80 215 }
meillo@80 216 if (psc->from_seen) {
meillo@80 217 smtp_printf(out, "503 MAIL FROM: already given.\r\n");
meillo@80 218 break;
meillo@80 219 }
meillo@128 220 if (get_size(buffer, &msize)) {
meillo@128 221 DEBUG(5) debugf("smtp_in(): get_size: msize=%ld, conf.mms=%d\n",
meillo@128 222 msize, conf.max_msg_size);
meillo@128 223 if (conf.max_msg_size && (msize > conf.max_msg_size)) {
meillo@128 224 smtp_printf(out, "552 Message size exceeds fixed limit.\r\n");
meillo@128 225 break;
meillo@128 226 }
meillo@128 227 }
meillo@136 228 if (!get_address(buffer, buf)) {
meillo@136 229 smtp_printf(out, "553 Address too long.\r\n");
meillo@136 230 break;
meillo@136 231 }
meillo@128 232
meillo@80 233 msg = create_message();
meillo@80 234 msg->received_host = remote_host ? g_strdup(remote_host) : NULL;
meillo@80 235 msg->received_prot = psc->prot;
meillo@80 236 msg->ident = ident ? g_strdup(ident) : NULL;
meillo@80 237 /* get transfer id and increment for next one */
meillo@80 238 msg->transfer_id = (psc->next_id)++;
meillo@80 239
meillo@80 240 if (remote_host) {
meillo@80 241 addr = create_address(buf, TRUE);
meillo@80 242 } else {
meillo@80 243 addr = create_address_qualified(buf, TRUE, conf.host_name);
meillo@80 244 }
meillo@80 245 if (!addr) {
meillo@80 246 smtp_printf(out, "501 %s: syntax error.\r\n", buf);
meillo@80 247 } else if (!addr->domain) {
meillo@80 248 smtp_printf(out, "501 return path must be qualified.\r\n", buf);
meillo@80 249 } else {
meillo@80 250 psc->from_seen = TRUE;
meillo@80 251 msg->return_path = addr;
meillo@80 252 smtp_printf(out, "250 OK %s is a nice guy.\r\n", addr->address);
meillo@80 253 }
meillo@80 254 }
meillo@10 255 break;
meillo@80 256
meillo@80 257 case SMTP_RCPT_TO:
meillo@80 258 {
meillo@80 259 char buf[MAX_ADDRESS];
meillo@80 260 address *addr;
meillo@80 261
meillo@80 262 if (!psc->helo_seen) {
meillo@80 263 smtp_printf(out, "503 need HELO or EHLO.\r\n");
meillo@80 264 break;
meillo@80 265 }
meillo@80 266 if (!psc->from_seen) {
meillo@80 267 smtp_printf(out, "503 need MAIL FROM: before RCPT TO:\r\n");
meillo@80 268 break;
meillo@80 269 }
meillo@136 270 if (!get_address(buffer, buf)) {
meillo@136 271 smtp_printf(out, "553 Address too long.\r\n");
meillo@136 272 break;
meillo@136 273 }
meillo@80 274
meillo@80 275 if (remote_host) {
meillo@80 276 addr = create_address(buf, TRUE);
meillo@80 277 } else {
meillo@80 278 addr = create_address_qualified(buf, TRUE, conf.host_name);
meillo@80 279 }
meillo@80 280 if (!addr) {
meillo@80 281 smtp_printf(out, "501 %s: syntax error in address.\r\n", buf);
meillo@80 282 break;
meillo@80 283 }
meillo@80 284 if (addr->local_part[0] == '|') {
meillo@80 285 smtp_printf(out, "501 %s: no pipe allowed for SMTP connections\r\n", buf);
meillo@80 286 break;
meillo@80 287 }
meillo@80 288 if (!addr->domain) {
meillo@305 289 /* TODO: ``postmaster'' may be unqualified */
meillo@80 290 smtp_printf(out, "501 recipient address must be qualified.\r\n", buf);
meillo@80 291 break;
meillo@80 292 }
meillo@305 293 if (!(conf.do_relay || addr_is_local(msg->return_path) || addr_is_local(addr))) {
meillo@80 294 smtp_printf(out, "550 relaying to %s denied.\r\n", addr_string(addr));
meillo@80 295 break;
meillo@80 296 }
meillo@80 297 psc->rcpt_seen = TRUE;
meillo@80 298 msg->rcpt_list = g_list_append(msg->rcpt_list, addr);
meillo@80 299 smtp_printf(out, "250 OK %s is our friend.\r\n", addr->address);
meillo@80 300 }
meillo@10 301 break;
meillo@80 302
meillo@80 303 case SMTP_DATA:
meillo@80 304 if (!psc->helo_seen) {
meillo@80 305 smtp_printf(out, "503 need HELO or EHLO.\r\n");
meillo@80 306 break;
meillo@80 307 }
meillo@80 308 if (!psc->rcpt_seen) {
meillo@80 309 smtp_printf(out, "503 need RCPT TO: before DATA\r\n");
meillo@80 310 break;
meillo@80 311 }
meillo@80 312 accept_error err;
meillo@80 313
meillo@80 314 smtp_printf(out, "354 okay, and do not forget the dot\r\n");
meillo@80 315
meillo@80 316 err = accept_message(in, msg, conf.do_save_envelope_to ? ACC_SAVE_ENVELOPE_TO : 0);
meillo@80 317 if (err != AERR_OK) {
meillo@117 318 switch (err) {
meillo@117 319 case AERR_TIMEOUT:
meillo@117 320 case AERR_EOF:
meillo@117 321 return;
meillo@117 322 case AERR_SIZE:
meillo@117 323 smtp_printf(out, "552 Error: message too large.\r\n");
meillo@117 324 return;
meillo@117 325 default:
meillo@117 326 /* should never happen: */
meillo@117 327 smtp_printf(out, "451 Unknown error\r\n");
meillo@80 328 return;
meillo@80 329 }
meillo@80 330 }
meillo@80 331
meillo@80 332
meillo@80 333 if (!spool_write(msg, TRUE)) {
meillo@80 334 smtp_printf(out, "451 Could not write spool file\r\n");
meillo@80 335 return;
meillo@80 336 }
meillo@80 337 pid_t pid;
meillo@80 338 smtp_printf(out, "250 OK id=%s\r\n", msg->uid);
meillo@80 339
meillo@80 340 if (remote_host != NULL) {
meillo@80 341 logwrite(LOG_NOTICE, "%s <= <%s@%s> host=%s with %s\n", msg->uid,
meillo@80 342 msg->return_path->local_part, msg->return_path->domain,
meillo@80 343 remote_host, prot_names[psc->prot]);
meillo@80 344 } else {
meillo@80 345 logwrite(LOG_NOTICE, "%s <= <%s@%s> with %s\n", msg->uid,
meillo@80 346 msg->return_path->local_part, msg->return_path->domain,
meillo@80 347 prot_names[psc->prot]);
meillo@80 348 }
meillo@80 349
meillo@80 350 if (conf.do_queue) {
meillo@80 351 DEBUG(1) debugf("queuing forced by configuration or option.\n");
meillo@80 352 } else {
meillo@80 353 pid = fork();
meillo@80 354 if (pid == 0) {
meillo@80 355 _exit(deliver(msg));
meillo@80 356 } else if (pid < 0) {
meillo@208 357 logwrite(LOG_ALERT, "could not fork for delivery, id = %s\n", msg->uid);
meillo@80 358 }
meillo@80 359 }
meillo@80 360 psc->rcpt_seen = psc->from_seen = FALSE;
meillo@80 361 destroy_message(msg);
meillo@80 362 msg = NULL;
meillo@80 363 break;
meillo@80 364
meillo@80 365 case SMTP_QUIT:
meillo@80 366 smtp_printf(out, "221 goodbye\r\n");
meillo@81 367 destroy_message(msg);
meillo@81 368 msg = NULL;
meillo@80 369 return;
meillo@80 370
meillo@80 371 case SMTP_RSET:
meillo@80 372 psc->from_seen = psc->rcpt_seen = FALSE;
meillo@81 373 destroy_message(msg);
meillo@81 374 msg = NULL;
meillo@80 375 smtp_printf(out, "250 OK\r\n");
meillo@80 376 break;
meillo@80 377
meillo@80 378 case SMTP_NOOP:
meillo@80 379 smtp_printf(out, "250 OK\r\n");
meillo@80 380 break;
meillo@80 381
meillo@80 382 case SMTP_HELP:
meillo@80 383 {
meillo@80 384 int i;
meillo@80 385
meillo@80 386 smtp_printf(out, "214-supported commands:\r\n");
meillo@80 387 for (i = 0; i < SMTP_NUM_IDS - 1; i++) {
meillo@80 388 smtp_printf(out, "214-%s\r\n", smtp_cmds[i].cmd);
meillo@80 389 }
meillo@80 390 smtp_printf(out, "214 %s\r\n", smtp_cmds[i].cmd);
meillo@80 391 }
meillo@80 392 break;
meillo@80 393
meillo@10 394 default:
meillo@80 395 smtp_printf(out, "501 command not recognized\r\n");
meillo@80 396 DEBUG(1) debugf("command not recognized, was '%s'\n", buffer);
meillo@10 397 break;
meillo@10 398 }
meillo@0 399 }
meillo@80 400 switch (len) {
meillo@80 401 case -3:
meillo@80 402 logwrite(LOG_NOTICE, "connection timed out\n");
meillo@80 403 break;
meillo@80 404 case -2:
meillo@80 405 logwrite(LOG_NOTICE, "line overflow\n");
meillo@80 406 break;
meillo@80 407 case -1:
meillo@80 408 logwrite(LOG_NOTICE, "received EOF\n");
meillo@80 409 break;
meillo@80 410 default:
meillo@80 411 break;
meillo@80 412 }
meillo@0 413 }