citadel/modules/smtp/serv_smtp.c

   1 /*
   2  * $Id$
   3  *
   4  * This module is an SMTP and ESMTP implementation for the Citadel system.
   5  * It is compliant with all of the following:
   6  *
   7  * RFC  821 - Simple Mail Transfer Protocol
   8  * RFC  876 - Survey of SMTP Implementations
   9  * RFC 1047 - Duplicate messages and SMTP
  10  * RFC 1652 - 8 bit MIME
  11  * RFC 1869 - Extended Simple Mail Transfer Protocol
  12  * RFC 1870 - SMTP Service Extension for Message Size Declaration
  13  * RFC 2033 - Local Mail Transfer Protocol
  14  * RFC 2197 - SMTP Service Extension for Command Pipelining
  15  * RFC 2476 - Message Submission
  16  * RFC 2487 - SMTP Service Extension for Secure SMTP over TLS
  17  * RFC 2554 - SMTP Service Extension for Authentication
  18  * RFC 2821 - Simple Mail Transfer Protocol
  19  * RFC 2822 - Internet Message Format
  20  * RFC 2920 - SMTP Service Extension for Command Pipelining
  21  *
  22  * The VRFY and EXPN commands have been removed from this implementation
  23  * because nobody uses these commands anymore, except for spammers.
  24  *
  25  * Copyright (c) 1998-2009 by the citadel.org team
  26  *
  27  *  This program is free software; you can redistribute it and/or modify
  28  *  it under the terms of the GNU General Public License as published by
  29  *  the Free Software Foundation; either version 3 of the License, or
  30  *  (at your option) any later version.
  31  *
  32  *  This program is distributed in the hope that it will be useful,
  33  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  34  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  35  *  GNU General Public License for more details.
  36  *
  37  *  You should have received a copy of the GNU General Public License
  38  *  along with this program; if not, write to the Free Software
  39  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  40  */
  41
  42 #include "sysdep.h"
  43 #include <stdlib.h>
  44 #include <unistd.h>
  45 #include <stdio.h>
  46 #include <fcntl.h>
  47 #include <signal.h>
  48 #include <pwd.h>
  49 #include <errno.h>
  50 #include <sys/types.h>
  51 #include <syslog.h>
  52
  53 #if TIME_WITH_SYS_TIME
  54 # include <sys/time.h>
  55 # include <time.h>
  56 #else
  57 # if HAVE_SYS_TIME_H
  58 #  include <sys/time.h>
  59 # else
  60 #  include <time.h>
  61 # endif
  62 #endif
  63
  64 #include <sys/wait.h>
  65 #include <ctype.h>
  66 #include <string.h>
  67 #include <limits.h>
  68 #include <sys/socket.h>
  69 #include <netinet/in.h>
  70 #include <arpa/inet.h>
  71 #include <libcitadel.h>
  72 #include "citadel.h"
  73 #include "server.h"
  74 #include "citserver.h"
  75 #include "support.h"
  76 #include "config.h"
  77 #include "control.h"
  78 #include "user_ops.h"
  79 #include "policy.h"
  80 #include "database.h"
  81 #include "msgbase.h"
  82 #include "internet_addressing.h"
  83 #include "genstamp.h"
  84 #include "domain.h"
  85 #include "clientsocket.h"
  86 #include "locate_host.h"
  87 #include "citadel_dirs.h"
  88
  89
  90
  91 #ifndef HAVE_SNPRINTF
  92 #include "snprintf.h"
  93 #endif
  94
  95
  96 #include "ctdl_module.h"
  97
  98
  99
 100 typedef struct _citsmtp {               /* Information about the current session */
 101         int command_state;
 102         char helo_node[SIZ];
 103         char from[SIZ];
 104         char recipients[SIZ];
 105         int number_of_recipients;
 106         int delivery_mode;
 107         int message_originated_locally;
 108         int is_lmtp;
 109         int is_unfiltered;
 110         int is_msa;
 111 }citsmtp;
 112
 113 enum {                          /* Command states for login authentication */
 114         smtp_command,
 115         smtp_user,
 116         smtp_password,
 117         smtp_plain
 118 };
 119
 120 #define SMTP            ((citsmtp *)CC->session_specific_data)
 121
 122
 123 int run_queue_now = 0;  /* Set to 1 to ignore SMTP send retry times */
 124
 125 citthread_mutex_t smtp_send_lock;
 126
 127
 128 /*****************************************************************************/
 129 /*                      SMTP SERVER (INBOUND) STUFF                          */
 130 /*****************************************************************************/
 131
 132
 133 /*
 134  * Here's where our SMTP session begins its happy day.
 135  */
 136 void smtp_greeting(int is_msa)
 137 {
 138         citsmtp *sSMTP;
 139         char message_to_spammer[1024];
 140
 141         strcpy(CC->cs_clientname, "SMTP session");
 142         CC->internal_pgm = 1;
 143         CC->cs_flags |= CS_STEALTH;
 144         CC->session_specific_data = malloc(sizeof(citsmtp));
 145         memset(SMTP, 0, sizeof(citsmtp));
 146         sSMTP = SMTP;
 147         sSMTP->is_msa = is_msa;
 148
 149         /* If this config option is set, reject connections from problem
 150          * addresses immediately instead of after they execute a RCPT
 151          */
 152         if ( (config.c_rbl_at_greeting) && (sSMTP->is_msa == 0) ) {
 153                 if (rbl_check(message_to_spammer)) {
 154                         if (CtdlThreadCheckStop())
 155                                 cprintf("421 %s\r\n", message_to_spammer);
 156                         else
 157                                 cprintf("550 %s\r\n", message_to_spammer);
 158                         CC->kill_me = 1;
 159                         /* no need to free_recipients(valid), it's not allocated yet */
 160                         return;
 161                 }
 162         }
 163
 164         /* Otherwise we're either clean or we check later. */
 165
 166         if (CC->nologin==1) {
 167                 cprintf("500 Too many users are already online (maximum is %d)\r\n",
 168                         config.c_maxsessions
 169                 );
 170                 CC->kill_me = 1;
 171                 /* no need to free_recipients(valid), it's not allocated yet */
 172                 return;
 173         }
 174
 175         /* Note: the FQDN *must* appear as the first thing after the 220 code.
 176          * Some clients (including citmail.c) depend on it being there.
 177          */
 178         cprintf("220 %s ESMTP Citadel server ready.\r\n", config.c_fqdn);
 179 }
 180
 181
 182 /*
 183  * SMTPS is just like SMTP, except it goes crypto right away.
 184  */
 185 void smtps_greeting(void) {
 186         CtdlModuleStartCryptoMsgs(NULL, NULL, NULL);
 187 #ifdef HAVE_OPENSSL
 188         if (!CC->redirect_ssl) CC->kill_me = 1;         /* kill session if no crypto */
 189 #endif
 190         smtp_greeting(0);
 191 }
 192
 193
 194 /*
 195  * SMTP MSA port requires authentication.
 196  */
 197 void smtp_msa_greeting(void) {
 198         smtp_greeting(1);
 199 }
 200
 201
 202 /*
 203  * LMTP is like SMTP but with some extra bonus footage added.
 204  */
 205 void lmtp_greeting(void) {
 206         citsmtp *sSMTP;
 207
 208         smtp_greeting(0);
 209         sSMTP = SMTP;
 210         SMTP->is_lmtp = 1;
 211 }
 212
 213
 214 /*
 215  * Generic SMTP MTA greeting
 216  */
 217 void smtp_mta_greeting(void) {
 218         smtp_greeting(0);
 219 }
 220
 221
 222 /*
 223  * We also have an unfiltered LMTP socket that bypasses spam filters.
 224  */
 225 void lmtp_unfiltered_greeting(void) {
 226         citsmtp *sSMTP;
 227
 228         smtp_greeting(0);
 229         sSMTP = SMTP;
 230         sSMTP->is_lmtp = 1;
 231         sSMTP->is_unfiltered = 1;
 232 }
 233
 234
 235 /*
 236  * Login greeting common to all auth methods
 237  */
 238 void smtp_auth_greeting(void) {
 239                 cprintf("235 Hello, %s\r\n", CC->user.fullname);
 240                 CtdlLogPrintf(CTDL_NOTICE, "SMTP authenticated %s\n", CC->user.fullname);
 241                 CC->internal_pgm = 0;
 242                 CC->cs_flags &= ~CS_STEALTH;
 243 }
 244
 245
 246 /*
 247  * Implement HELO and EHLO commands.
 248  *
 249  * which_command:  0=HELO, 1=EHLO, 2=LHLO
 250  */
 251 void smtp_hello(char *argbuf, int which_command) {
 252         citsmtp *sSMTP = SMTP;
 253
 254         safestrncpy(sSMTP->helo_node, argbuf, sizeof sSMTP->helo_node);
 255
 256         if ( (which_command != 2) && (sSMTP->is_lmtp) ) {
 257                 cprintf("500 Only LHLO is allowed when running LMTP\r\n");
 258                 return;
 259         }
 260
 261         if ( (which_command == 2) && (sSMTP->is_lmtp == 0) ) {
 262                 cprintf("500 LHLO is only allowed when running LMTP\r\n");
 263                 return;
 264         }
 265
 266         if (which_command == 0) {
 267                 cprintf("250 Hello %s (%s [%s])\r\n",
 268                         sSMTP->helo_node,
 269                         CC->cs_host,
 270                         CC->cs_addr
 271                 );
 272         }
 273         else {
 274                 if (which_command == 1) {
 275                         cprintf("250-Hello %s (%s [%s])\r\n",
 276                                 sSMTP->helo_node,
 277                                 CC->cs_host,
 278                                 CC->cs_addr
 279                         );
 280                 }
 281                 else {
 282                         cprintf("250-Greetings and joyous salutations.\r\n");
 283                 }
 284                 cprintf("250-HELP\r\n");
 285                 cprintf("250-SIZE %ld\r\n", config.c_maxmsglen);
 286
 287 #ifdef HAVE_OPENSSL
 288                 /*
 289                  * Offer TLS, but only if TLS is not already active.
 290                  * Furthermore, only offer TLS when running on
 291                  * the SMTP-MSA port, not on the SMTP-MTA port, due to
 292                  * questionable reliability of TLS in certain sending MTA's.
 293                  */
 294                 if ( (!CC->redirect_ssl) && (sSMTP->is_msa) ) {
 295                         cprintf("250-STARTTLS\r\n");
 296                 }
 297 #endif  /* HAVE_OPENSSL */
 298
 299                 cprintf("250-AUTH LOGIN PLAIN\r\n"
 300                         "250-AUTH=LOGIN PLAIN\r\n"
 301                         "250 8BITMIME\r\n"
 302                 );
 303         }
 304 }
 305
 306
 307
 308 /*
 309  * Implement HELP command.
 310  */
 311 void smtp_help(void) {
 312         cprintf("214 RTFM http://www.ietf.org/rfc/rfc2821.txt\r\n");
 313 }
 314
 315
 316 /*
 317  *
 318  */
 319 void smtp_get_user(char *argbuf) {
 320         char buf[SIZ];
 321         char username[SIZ];
 322         citsmtp *sSMTP = SMTP;
 323
 324         CtdlDecodeBase64(username, argbuf, SIZ);
 325         /* CtdlLogPrintf(CTDL_DEBUG, "Trying <%s>\n", username); */
 326         if (CtdlLoginExistingUser(NULL, username) == login_ok) {
 327                 CtdlEncodeBase64(buf, "Password:", 9, 0);
 328                 cprintf("334 %s\r\n", buf);
 329                 sSMTP->command_state = smtp_password;
 330         }
 331         else {
 332                 cprintf("500 No such user.\r\n");
 333                 sSMTP->command_state = smtp_command;
 334         }
 335 }
 336
 337
 338 /*
 339  *
 340  */
 341 void smtp_get_pass(char *argbuf) {
 342         char password[SIZ];
 343
 344         memset(password, 0, sizeof(password));
 345         CtdlDecodeBase64(password, argbuf, SIZ);
 346         /* CtdlLogPrintf(CTDL_DEBUG, "Trying <%s>\n", password); */
 347         if (CtdlTryPassword(password) == pass_ok) {
 348                 smtp_auth_greeting();
 349         }
 350         else {
 351                 cprintf("535 Authentication failed.\r\n");
 352         }
 353         SMTP->command_state = smtp_command;
 354 }
 355
 356
 357 /*
 358  * Back end for PLAIN auth method (either inline or multistate)
 359  */
 360 void smtp_try_plain(char *encoded_authstring) {
 361         char decoded_authstring[1024];
 362         char ident[256];
 363         char user[256];
 364         char pass[256];
 365         int result;
 366
 367         CtdlDecodeBase64(decoded_authstring, encoded_authstring, strlen(encoded_authstring) );
 368         safestrncpy(ident, decoded_authstring, sizeof ident);
 369         safestrncpy(user, &decoded_authstring[strlen(ident) + 1], sizeof user);
 370         safestrncpy(pass, &decoded_authstring[strlen(ident) + strlen(user) + 2], sizeof pass);
 371
 372         SMTP->command_state = smtp_command;
 373
 374         if (!IsEmptyStr(ident)) {
 375                 result = CtdlLoginExistingUser(user, ident);
 376         }
 377         else {
 378                 result = CtdlLoginExistingUser(NULL, user);
 379         }
 380
 381         if (result == login_ok) {
 382                 if (CtdlTryPassword(pass) == pass_ok) {
 383                         smtp_auth_greeting();
 384                         return;
 385                 }
 386         }
 387         cprintf("504 Authentication failed.\r\n");
 388 }
 389
 390
 391 /*
 392  * Attempt to perform authenticated SMTP
 393  */
 394 void smtp_auth(char *argbuf) {
 395         char username_prompt[64];
 396         char method[64];
 397         char encoded_authstring[1024];
 398
 399         if (CC->logged_in) {
 400                 cprintf("504 Already logged in.\r\n");
 401                 return;
 402         }
 403
 404         extract_token(method, argbuf, 0, ' ', sizeof method);
 405
 406         if (!strncasecmp(method, "login", 5) ) {
 407                 if (strlen(argbuf) >= 7) {
 408                         smtp_get_user(&argbuf[6]);
 409                 }
 410                 else {
 411                         CtdlEncodeBase64(username_prompt, "Username:", 9, 0);
 412                         cprintf("334 %s\r\n", username_prompt);
 413                         SMTP->command_state = smtp_user;
 414                 }
 415                 return;
 416         }
 417
 418         if (!strncasecmp(method, "plain", 5) ) {
 419                 if (num_tokens(argbuf, ' ') < 2) {
 420                         cprintf("334 \r\n");
 421                         SMTP->command_state = smtp_plain;
 422                         return;
 423                 }
 424
 425                 extract_token(encoded_authstring, argbuf, 1, ' ', sizeof encoded_authstring);
 426
 427                 smtp_try_plain(encoded_authstring);
 428                 return;
 429         }
 430
 431         if (strncasecmp(method, "login", 5) ) {
 432                 cprintf("504 Unknown authentication method.\r\n");
 433                 return;
 434         }
 435
 436 }
 437
 438
 439 /*
 440  * Implements the RSET (reset state) command.
 441  * Currently this just zeroes out the state buffer.  If pointers to data
 442  * allocated with malloc() are ever placed in the state buffer, we have to
 443  * be sure to free() them first!
 444  *
 445  * Set do_response to nonzero to output the SMTP RSET response code.
 446  */
 447 void smtp_rset(int do_response) {
 448         int is_lmtp;
 449         int is_unfiltered;
 450         citsmtp *sSMTP = SMTP;
 451
 452         /*
 453          * Our entire SMTP state is discarded when a RSET command is issued,
 454          * but we need to preserve this one little piece of information, so
 455          * we save it for later.
 456          */
 457         is_lmtp = sSMTP->is_lmtp;
 458         is_unfiltered = sSMTP->is_unfiltered;
 459
 460         memset(sSMTP, 0, sizeof(citsmtp));
 461
 462         /*
 463          * It is somewhat ambiguous whether we want to log out when a RSET
 464          * command is issued.  Here's the code to do it.  It is commented out
 465          * because some clients (such as Pine) issue RSET commands before
 466          * each message, but still expect to be logged in.
 467          *
 468          * if (CC->logged_in) {
 469          *      logout(CC);
 470          * }
 471          */
 472
 473         /*
 474          * Reinstate this little piece of information we saved (see above).
 475          */
 476         sSMTP->is_lmtp = is_lmtp;
 477         sSMTP->is_unfiltered = is_unfiltered;
 478
 479         if (do_response) {
 480                 cprintf("250 Zap!\r\n");
 481         }
 482 }
 483
 484 /*
 485  * Clear out the portions of the state buffer that need to be cleared out
 486  * after the DATA command finishes.
 487  */
 488 void smtp_data_clear(void) {
 489         citsmtp *sSMTP = SMTP;
 490
 491         strcpy(sSMTP->from, "");
 492         strcpy(sSMTP->recipients, "");
 493         sSMTP->number_of_recipients = 0;
 494         sSMTP->delivery_mode = 0;
 495         sSMTP->message_originated_locally = 0;
 496 }
 497
 498 const char *smtp_get_Recipients(void)
 499 {
 500         citsmtp *sSMTP = SMTP;
 501
 502         if (sSMTP == NULL)
 503                 return NULL;
 504         else return sSMTP->from;
 505 }
 506
 507 /*
 508  * Implements the "MAIL FROM:" command
 509  */
 510 void smtp_mail(char *argbuf) {
 511         char user[SIZ];
 512         char node[SIZ];
 513         char name[SIZ];
 514         citsmtp *sSMTP = SMTP;
 515
 516         if (!IsEmptyStr(sSMTP->from)) {
 517                 cprintf("503 Only one sender permitted\r\n");
 518                 return;
 519         }
 520
 521         if (strncasecmp(argbuf, "From:", 5)) {
 522                 cprintf("501 Syntax error\r\n");
 523                 return;
 524         }
 525
 526         strcpy(sSMTP->from, &argbuf[5]);
 527         striplt(sSMTP->from);
 528         if (haschar(sSMTP->from, '<') > 0) {
 529                 stripallbut(sSMTP->from, '<', '>');
 530         }
 531
 532         /* We used to reject empty sender names, until it was brought to our
 533          * attention that RFC1123 5.2.9 requires that this be allowed.  So now
 534          * we allow it, but replace the empty string with a fake
 535          * address so we don't have to contend with the empty string causing
 536          * other code to fail when it's expecting something there.
 537          */
 538         if (IsEmptyStr(sSMTP->from)) {
 539                 strcpy(sSMTP->from, "someone@example.com");
 540         }
 541
 542         /* If this SMTP connection is from a logged-in user, force the 'from'
 543          * to be the user's Internet e-mail address as Citadel knows it.
 544          */
 545         if (CC->logged_in) {
 546                 safestrncpy(sSMTP->from, CC->cs_inet_email, sizeof sSMTP->from);
 547                 cprintf("250 Sender ok <%s>\r\n", sSMTP->from);
 548                 sSMTP->message_originated_locally = 1;
 549                 return;
 550         }
 551
 552         else if (sSMTP->is_lmtp) {
 553                 /* Bypass forgery checking for LMTP */
 554         }
 555
 556         /* Otherwise, make sure outsiders aren't trying to forge mail from
 557          * this system (unless, of course, c_allow_spoofing is enabled)
 558          */
 559         else if (config.c_allow_spoofing == 0) {
 560                 process_rfc822_addr(sSMTP->from, user, node, name);
 561                 if (CtdlHostAlias(node) != hostalias_nomatch) {
 562                         cprintf("550 You must log in to send mail from %s\r\n", node);
 563                         strcpy(sSMTP->from, "");
 564                         return;
 565                 }
 566         }
 567
 568         cprintf("250 Sender ok\r\n");
 569 }
 570
 571
 572
 573 /*
 574  * Implements the "RCPT To:" command
 575  */
 576 void smtp_rcpt(char *argbuf) {
 577         char recp[1024];
 578         char message_to_spammer[SIZ];
 579         struct recptypes *valid = NULL;
 580         citsmtp *sSMTP = SMTP;
 581
 582         if (IsEmptyStr(sSMTP->from)) {
 583                 cprintf("503 Need MAIL before RCPT\r\n");
 584                 return;
 585         }
 586
 587         if (strncasecmp(argbuf, "To:", 3)) {
 588                 cprintf("501 Syntax error\r\n");
 589                 return;
 590         }
 591
 592         if ( (sSMTP->is_msa) && (!CC->logged_in) ) {
 593                 cprintf("550 You must log in to send mail on this port.\r\n");
 594                 strcpy(sSMTP->from, "");
 595                 return;
 596         }
 597
 598         safestrncpy(recp, &argbuf[3], sizeof recp);
 599         striplt(recp);
 600         stripallbut(recp, '<', '>');
 601
 602         if ( (strlen(recp) + strlen(sSMTP->recipients) + 1 ) >= SIZ) {
 603                 cprintf("452 Too many recipients\r\n");
 604                 return;
 605         }
 606
 607         /* RBL check */
 608         if ( (!CC->logged_in)   /* Don't RBL authenticated users */
 609            && (!sSMTP->is_lmtp) ) {     /* Don't RBL LMTP clients */
 610                 if (config.c_rbl_at_greeting == 0) {    /* Don't RBL again if we already did it */
 611                         if (rbl_check(message_to_spammer)) {
 612                                 if (CtdlThreadCheckStop())
 613                                         cprintf("421 %s\r\n", message_to_spammer);
 614                                 else
 615                                         cprintf("550 %s\r\n", message_to_spammer);
 616                                 /* no need to free_recipients(valid), it's not allocated yet */
 617                                 return;
 618                         }
 619                 }
 620         }
 621
 622         valid = validate_recipients(recp,
 623                                     smtp_get_Recipients (),
 624                                     (sSMTP->is_lmtp)? POST_LMTP:
 625                                        (CC->logged_in)? POST_LOGGED_IN:
 626                                                         POST_EXTERNAL);
 627         if (valid->num_error != 0) {
 628                 cprintf("550 %s\r\n", valid->errormsg);
 629                 free_recipients(valid);
 630                 return;
 631         }
 632
 633         if (valid->num_internet > 0) {
 634                 if (CC->logged_in) {
 635                         if (CtdlCheckInternetMailPermission(&CC->user)==0) {
 636                                 cprintf("551 <%s> - you do not have permission to send Internet mail\r\n", recp);
 637                                 free_recipients(valid);
 638                                 return;
 639                         }
 640                 }
 641         }
 642
 643         if (valid->num_internet > 0) {
 644                 if ( (sSMTP->message_originated_locally == 0)
 645                    && (sSMTP->is_lmtp == 0) ) {
 646                         cprintf("551 <%s> - relaying denied\r\n", recp);
 647                         free_recipients(valid);
 648                         return;
 649                 }
 650         }
 651
 652         cprintf("250 RCPT ok <%s>\r\n", recp);
 653         if (!IsEmptyStr(sSMTP->recipients)) {
 654                 strcat(sSMTP->recipients, ",");
 655         }
 656         strcat(sSMTP->recipients, recp);
 657         sSMTP->number_of_recipients += 1;
 658         if (valid != NULL)  {
 659                 free_recipients(valid);
 660         }
 661 }
 662
 663
 664
 665
 666 /*
 667  * Implements the DATA command
 668  */
 669 void smtp_data(void) {
 670         StrBuf *body;
 671         char *defbody; //TODO: remove me
 672         struct CtdlMessage *msg = NULL;
 673         long msgnum = (-1L);
 674         char nowstamp[SIZ];
 675         struct recptypes *valid;
 676         int scan_errors;
 677         int i;
 678         char result[SIZ];
 679         citsmtp *sSMTP = SMTP;
 680
 681         if (IsEmptyStr(sSMTP->from)) {
 682                 cprintf("503 Need MAIL command first.\r\n");
 683                 return;
 684         }
 685
 686         if (sSMTP->number_of_recipients < 1) {
 687                 cprintf("503 Need RCPT command first.\r\n");
 688                 return;
 689         }
 690
 691         cprintf("354 Transmit message now - terminate with '.' by itself\r\n");
 692
 693         datestring(nowstamp, sizeof nowstamp, time(NULL), DATESTRING_RFC822);
 694         defbody = malloc(4096);
 695
 696         if (defbody != NULL) {
 697                 if (sSMTP->is_lmtp && (CC->cs_UDSclientUID != -1)) {
 698                         snprintf(defbody, 4096,
 699                                "Received: from %s (Citadel from userid %ld)\n"
 700                                "        by %s; %s\n",
 701                                sSMTP->helo_node,
 702                                (long int) CC->cs_UDSclientUID,
 703                                config.c_fqdn,
 704                                nowstamp);
 705                 }
 706                 else {
 707                         snprintf(defbody, 4096,
 708                                  "Received: from %s (%s [%s])\n"
 709                                  "      by %s; %s\n",
 710                                  sSMTP->helo_node,
 711                                  CC->cs_host,
 712                                  CC->cs_addr,
 713                                  config.c_fqdn,
 714                                  nowstamp);
 715                 }
 716         }
 717         body = CtdlReadMessageBodyBuf(HKEY("."), config.c_maxmsglen, defbody, 1, NULL);
 718         if (body == NULL) {
 719                 cprintf("550 Unable to save message: internal error.\r\n");
 720                 return;
 721         }
 722
 723         CtdlLogPrintf(CTDL_DEBUG, "Converting message...\n");
 724         msg = convert_internet_message_buf(&body);
 725
 726         /* If the user is locally authenticated, FORCE the From: header to
 727          * show up as the real sender.  Yes, this violates the RFC standard,
 728          * but IT MAKES SENSE.  If you prefer strict RFC adherence over
 729          * common sense, you can disable this in the configuration.
 730          *
 731          * We also set the "message room name" ('O' field) to MAILROOM
 732          * (which is Mail> on most systems) to prevent it from getting set
 733          * to something ugly like "0000058008.Sent Items>" when the message
 734          * is read with a Citadel client.
 735          */
 736         if ( (CC->logged_in) && (config.c_rfc822_strict_from == 0) ) {
 737                 if (msg->cm_fields['A'] != NULL) free(msg->cm_fields['A']);
 738                 if (msg->cm_fields['N'] != NULL) free(msg->cm_fields['N']);
 739                 if (msg->cm_fields['H'] != NULL) free(msg->cm_fields['H']);
 740                 if (msg->cm_fields['F'] != NULL) free(msg->cm_fields['F']);
 741                 if (msg->cm_fields['O'] != NULL) free(msg->cm_fields['O']);
 742                 msg->cm_fields['A'] = strdup(CC->user.fullname);
 743                 msg->cm_fields['N'] = strdup(config.c_nodename);
 744                 msg->cm_fields['H'] = strdup(config.c_humannode);
 745                 msg->cm_fields['F'] = strdup(CC->cs_inet_email);
 746                 msg->cm_fields['O'] = strdup(MAILROOM);
 747         }
 748
 749         /* Set the "envelope from" address */
 750         if (msg->cm_fields['P'] != NULL) {
 751                 free(msg->cm_fields['P']);
 752         }
 753         msg->cm_fields['P'] = strdup(sSMTP->from);
 754
 755         /* Set the "envelope to" address */
 756         if (msg->cm_fields['V'] != NULL) {
 757                 free(msg->cm_fields['V']);
 758         }
 759         msg->cm_fields['V'] = strdup(sSMTP->recipients);
 760
 761         /* Submit the message into the Citadel system. */
 762         valid = validate_recipients(sSMTP->recipients,
 763                                     smtp_get_Recipients (),
 764                                     (sSMTP->is_lmtp)? POST_LMTP:
 765                                        (CC->logged_in)? POST_LOGGED_IN:
 766                                                         POST_EXTERNAL);
 767
 768         /* If there are modules that want to scan this message before final
 769          * submission (such as virus checkers or spam filters), call them now
 770          * and give them an opportunity to reject the message.
 771          */
 772         if (sSMTP->is_unfiltered) {
 773                 scan_errors = 0;
 774         }
 775         else {
 776                 scan_errors = PerformMessageHooks(msg, EVT_SMTPSCAN);
 777         }
 778
 779         if (scan_errors > 0) {  /* We don't want this message! */
 780
 781                 if (msg->cm_fields['0'] == NULL) {
 782                         msg->cm_fields['0'] = strdup("Message rejected by filter");
 783                 }
 784
 785                 sprintf(result, "550 %s\r\n", msg->cm_fields['0']);
 786         }
 787
 788         else {                  /* Ok, we'll accept this message. */
 789                 msgnum = CtdlSubmitMsg(msg, valid, "", 0);
 790                 if (msgnum > 0L) {
 791                         sprintf(result, "250 Message accepted.\r\n");
 792                 }
 793                 else {
 794                         sprintf(result, "550 Internal delivery error\r\n");
 795                 }
 796         }
 797
 798         /* For SMTP and ESTMP, just print the result message.  For LMTP, we
 799          * have to print one result message for each recipient.  Since there
 800          * is nothing in Citadel which would cause different recipients to
 801          * have different results, we can get away with just spitting out the
 802          * same message once for each recipient.
 803          */
 804         if (sSMTP->is_lmtp) {
 805                 for (i=0; i<sSMTP->number_of_recipients; ++i) {
 806                         cprintf("%s", result);
 807                 }
 808         }
 809         else {
 810                 cprintf("%s", result);
 811         }
 812
 813         /* Write something to the syslog (which may or may not be where the
 814          * rest of the Citadel logs are going; some sysadmins want LOG_MAIL).
 815          */
 816         if (enable_syslog) {
 817                 syslog((LOG_MAIL | LOG_INFO),
 818                         "%ld: from=<%s>, nrcpts=%d, relay=%s [%s], stat=%s",
 819                         msgnum,
 820                         sSMTP->from,
 821                         sSMTP->number_of_recipients,
 822                         CC->cs_host,
 823                         CC->cs_addr,
 824                         result
 825                 );
 826         }
 827
 828         /* Clean up */
 829         CtdlFreeMessage(msg);
 830         free_recipients(valid);
 831         smtp_data_clear();      /* clear out the buffers now */
 832 }
 833
 834
 835 /*
 836  * implements the STARTTLS command (Citadel API version)
 837  */
 838 void smtp_starttls(void)
 839 {
 840         char ok_response[SIZ];
 841         char nosup_response[SIZ];
 842         char error_response[SIZ];
 843
 844         sprintf(ok_response,
 845                 "220 Begin TLS negotiation now\r\n");
 846         sprintf(nosup_response,
 847                 "554 TLS not supported here\r\n");
 848         sprintf(error_response,
 849                 "554 Internal error\r\n");
 850         CtdlModuleStartCryptoMsgs(ok_response, nosup_response, error_response);
 851         smtp_rset(0);
 852 }
 853
 854
 855
 856 /*
 857  * Main command loop for SMTP sessions.
 858  */
 859 void smtp_command_loop(void) {
 860         char cmdbuf[SIZ];
 861         citsmtp *sSMTP = SMTP;
 862
 863         if (sSMTP == NULL) {
 864                 CtdlLogPrintf(CTDL_EMERG, "Session SMTP data is null.  WTF?  We will crash now.\n");
 865         }
 866
 867         time(&CC->lastcmd);
 868         memset(cmdbuf, 0, sizeof cmdbuf); /* Clear it, just in case */
 869         if (client_getln(cmdbuf, sizeof cmdbuf) < 1) {
 870                 CtdlLogPrintf(CTDL_CRIT, "Client disconnected: ending session.\n");
 871                 CC->kill_me = 1;
 872                 return;
 873         }
 874         CtdlLogPrintf(CTDL_INFO, "SMTP server: %s\n", cmdbuf);
 875         while (strlen(cmdbuf) < 5) strcat(cmdbuf, " ");
 876
 877         if (sSMTP->command_state == smtp_user) {
 878                 smtp_get_user(cmdbuf);
 879         }
 880
 881         else if (sSMTP->command_state == smtp_password) {
 882                 smtp_get_pass(cmdbuf);
 883         }
 884
 885         else if (sSMTP->command_state == smtp_plain) {
 886                 smtp_try_plain(cmdbuf);
 887         }
 888
 889         else if (!strncasecmp(cmdbuf, "AUTH", 4)) {
 890                 smtp_auth(&cmdbuf[5]);
 891         }
 892
 893         else if (!strncasecmp(cmdbuf, "DATA", 4)) {
 894                 smtp_data();
 895         }
 896
 897         else if (!strncasecmp(cmdbuf, "HELO", 4)) {
 898                 smtp_hello(&cmdbuf[5], 0);
 899         }
 900
 901         else if (!strncasecmp(cmdbuf, "EHLO", 4)) {
 902                 smtp_hello(&cmdbuf[5], 1);
 903         }
 904
 905         else if (!strncasecmp(cmdbuf, "LHLO", 4)) {
 906                 smtp_hello(&cmdbuf[5], 2);
 907         }
 908
 909         else if (!strncasecmp(cmdbuf, "HELP", 4)) {
 910                 smtp_help();
 911         }
 912
 913         else if (!strncasecmp(cmdbuf, "MAIL", 4)) {
 914                 smtp_mail(&cmdbuf[5]);
 915         }
 916
 917         else if (!strncasecmp(cmdbuf, "NOOP", 4)) {
 918                 cprintf("250 NOOP\r\n");
 919         }
 920
 921         else if (!strncasecmp(cmdbuf, "QUIT", 4)) {
 922                 cprintf("221 Goodbye...\r\n");
 923                 CC->kill_me = 1;
 924                 return;
 925         }
 926
 927         else if (!strncasecmp(cmdbuf, "RCPT", 4)) {
 928                 smtp_rcpt(&cmdbuf[5]);
 929         }
 930
 931         else if (!strncasecmp(cmdbuf, "RSET", 4)) {
 932                 smtp_rset(1);
 933         }
 934 #ifdef HAVE_OPENSSL
 935         else if (!strcasecmp(cmdbuf, "STARTTLS")) {
 936                 smtp_starttls();
 937         }
 938 #endif
 939         else {
 940                 cprintf("502 I'm afraid I can't do that.\r\n");
 941         }
 942
 943
 944 }
 945
 946
 947
 948
 949 /*****************************************************************************/
 950 /*               SMTP CLIENT (OUTBOUND PROCESSING) STUFF                     */
 951 /*****************************************************************************/
 952
 953
 954
 955 /*
 956  * smtp_try()
 957  *
 958  * Called by smtp_do_procmsg() to attempt delivery to one SMTP host
 959  *
 960  */
 961 void smtp_try(const char *key, const char *addr, int *status,
 962               char *dsn, size_t n, long msgnum, char *envelope_from)
 963 {
 964         int sock = (-1);
 965         char mxhosts[1024];
 966         int num_mxhosts;
 967         int mx;
 968         int i;
 969         char user[1024], node[1024], name[1024];
 970         char buf[1024];
 971         char mailfrom[1024];
 972         char mx_user[256];
 973         char mx_pass[256];
 974         char mx_host[256];
 975         char mx_port[256];
 976         int lp, rp;
 977         char *msgtext;
 978         const char *ptr;
 979         size_t msg_size;
 980         int scan_done;
 981         CitContext *CCC=CC;
 982
 983
 984         /* Parse out the host portion of the recipient address */
 985         process_rfc822_addr(addr, user, node, name);
 986
 987         CtdlLogPrintf(CTDL_DEBUG, "SMTP client: Attempting delivery to <%s> @ <%s> (%s)\n",
 988                 user, node, name);
 989
 990         /* Load the message out of the database */
 991         CCC->redirect_buffer = malloc(SIZ);
 992         CCC->redirect_len = 0;
 993         CCC->redirect_alloc = SIZ;
 994         CtdlOutputMsg(msgnum, MT_RFC822, HEADERS_ALL, 0, 1, NULL, ESC_DOT);
 995         msgtext = CC->redirect_buffer;
 996         msg_size = CC->redirect_len;
 997         CCC->redirect_buffer = NULL;
 998         CCC->redirect_len = 0;
 999         CCC->redirect_alloc = 0;
1000
1001         /* If no envelope_from is supplied, extract one from the message */
1002         if ( (envelope_from == NULL) || (IsEmptyStr(envelope_from)) ) {
1003                 strcpy(mailfrom, "");
1004                 scan_done = 0;
1005                 ptr = msgtext;
1006                 do {
1007                         if (ptr = memreadline(ptr, buf, sizeof buf), *ptr == 0) {
1008                                 scan_done = 1;
1009                         }
1010                         if (!strncasecmp(buf, "From:", 5)) {
1011                                 safestrncpy(mailfrom, &buf[5], sizeof mailfrom);
1012                                 striplt(mailfrom);
1013                                 for (i=0; mailfrom[i]; ++i) {
1014                                         if (!isprint(mailfrom[i])) {
1015                                                 strcpy(&mailfrom[i], &mailfrom[i+1]);
1016                                                 i=0;
1017                                         }
1018                                 }
1019
1020                                 /* Strip out parenthesized names */
1021                                 lp = (-1);
1022                                 rp = (-1);
1023                                 for (i=0; mailfrom[i]; ++i) {
1024                                         if (mailfrom[i] == '(') lp = i;
1025                                         if (mailfrom[i] == ')') rp = i;
1026                                 }
1027                                 if ((lp>0)&&(rp>lp)) {
1028                                         strcpy(&mailfrom[lp-1], &mailfrom[rp+1]);
1029                                 }
1030
1031                                 /* Prefer brokketized names */
1032                                 lp = (-1);
1033                                 rp = (-1);
1034                                 for (i=0; mailfrom[i]; ++i) {
1035                                         if (mailfrom[i] == '<') lp = i;
1036                                         if (mailfrom[i] == '>') rp = i;
1037                                 }
1038                                 if ( (lp>=0) && (rp>lp) ) {
1039                                         mailfrom[rp] = 0;
1040                                         strcpy(mailfrom, &mailfrom[lp]);
1041                                 }
1042
1043                                 scan_done = 1;
1044                         }
1045                 } while (scan_done == 0);
1046                 if (IsEmptyStr(mailfrom)) strcpy(mailfrom, "someone@somewhere.org");
1047                 stripallbut(mailfrom, '<', '>');
1048                 envelope_from = mailfrom;
1049         }
1050
1051         /* Figure out what mail exchanger host we have to connect to */
1052         num_mxhosts = getmx(mxhosts, node);
1053         CtdlLogPrintf(CTDL_DEBUG, "Number of MX hosts for <%s> is %d [%s]\n", node, num_mxhosts, mxhosts);
1054         if (num_mxhosts < 1) {
1055                 *status = 5;
1056                 snprintf(dsn, SIZ, "No MX hosts found for <%s>", node);
1057                 return;
1058         }
1059
1060         sock = (-1);
1061         for (mx=0; (mx<num_mxhosts && sock < 0); ++mx) {
1062                 char *endpart;
1063                 extract_token(buf, mxhosts, mx, '|', sizeof buf);
1064                 strcpy(mx_user, "");
1065                 strcpy(mx_pass, "");
1066                 if (num_tokens(buf, '@') > 1) {
1067                         strcpy (mx_user, buf);
1068                         endpart = strrchr(mx_user, '@');
1069                         *endpart = '\0';
1070                         strcpy (mx_host, endpart + 1);
1071                         endpart = strrchr(mx_user, ':');
1072                         if (endpart != NULL) {
1073                                 strcpy(mx_pass, endpart+1);
1074                                 *endpart = '\0';
1075                         }
1076                 }
1077                 else
1078                         strcpy (mx_host, buf);
1079                 endpart = strrchr(mx_host, ':');
1080                 if (endpart != 0){
1081                         *endpart = '\0';
1082                         strcpy(mx_port, endpart + 1);
1083                 }
1084                 else {
1085                         strcpy(mx_port, "25");
1086                 }
1087                 CtdlLogPrintf(CTDL_DEBUG, "SMTP client: connecting to %s : %s ...\n", mx_host, mx_port);
1088                 sock = sock_connect(mx_host, mx_port, "tcp");
1089                 snprintf(dsn, SIZ, "Could not connect: %s", strerror(errno));
1090                 if (sock >= 0) CtdlLogPrintf(CTDL_DEBUG, "SMTP client: connected!\n");
1091                 if (sock < 0) {
1092                         if (errno > 0) {
1093                                 snprintf(dsn, SIZ, "%s", strerror(errno));
1094                         }
1095                         else {
1096                                 snprintf(dsn, SIZ, "Unable to connect to %s : %s\n", mx_host, mx_port);
1097                         }
1098                 }
1099         }
1100
1101         if (sock < 0) {
1102                 *status = 4;    /* dsn is already filled in */
1103                 return;
1104         }
1105
1106         CCC->sReadBuf = NewStrBuf();
1107         CCC->sMigrateBuf = NewStrBuf();
1108         CCC->sPos = NULL;
1109
1110         /* Process the SMTP greeting from the server */
1111         if (ml_sock_gets(&sock, buf) < 0) {
1112                 *status = 4;
1113                 strcpy(dsn, "Connection broken during SMTP conversation");
1114                 goto bail;
1115         }
1116         CtdlLogPrintf(CTDL_DEBUG, "<%s\n", buf);
1117         if (buf[0] != '2') {
1118                 if (buf[0] == '4') {
1119                         *status = 4;
1120                         safestrncpy(dsn, &buf[4], 1023);
1121                         goto bail;
1122                 }
1123                 else {
1124                         *status = 5;
1125                         safestrncpy(dsn, &buf[4], 1023);
1126                         goto bail;
1127                 }
1128         }
1129
1130         /* At this point we know we are talking to a real SMTP server */
1131
1132         /* Do a EHLO command.  If it fails, try the HELO command. */
1133         snprintf(buf, sizeof buf, "EHLO %s\r\n", config.c_fqdn);
1134         CtdlLogPrintf(CTDL_DEBUG, ">%s", buf);
1135         sock_write(&sock, buf, strlen(buf));
1136         if (ml_sock_gets(&sock, buf) < 0) {
1137                 *status = 4;
1138                 strcpy(dsn, "Connection broken during SMTP HELO");
1139                 goto bail;
1140         }
1141         CtdlLogPrintf(CTDL_DEBUG, "<%s\n", buf);
1142         if (buf[0] != '2') {
1143                 snprintf(buf, sizeof buf, "HELO %s\r\n", config.c_fqdn);
1144                 CtdlLogPrintf(CTDL_DEBUG, ">%s", buf);
1145                 sock_write(&sock, buf, strlen(buf));
1146                 if (ml_sock_gets(&sock, buf) < 0) {
1147                         *status = 4;
1148                         strcpy(dsn, "Connection broken during SMTP HELO");
1149                         goto bail;
1150                 }
1151         }
1152         if (buf[0] != '2') {
1153                 if (buf[0] == '4') {
1154                         *status = 4;
1155                         safestrncpy(dsn, &buf[4], 1023);
1156                         goto bail;
1157                 }
1158                 else {
1159                         *status = 5;
1160                         safestrncpy(dsn, &buf[4], 1023);
1161                         goto bail;
1162                 }
1163         }
1164
1165         /* Do an AUTH command if necessary */
1166         if (!IsEmptyStr(mx_user)) {
1167                 char encoded[1024];
1168                 sprintf(buf, "%s%c%s%c%s", mx_user, '\0', mx_user, '\0', mx_pass);
1169                 CtdlEncodeBase64(encoded, buf, strlen(mx_user) + strlen(mx_user) + strlen(mx_pass) + 2, 0);
1170                 snprintf(buf, sizeof buf, "AUTH PLAIN %s\r\n", encoded);
1171                 CtdlLogPrintf(CTDL_DEBUG, ">%s", buf);
1172                 sock_write(&sock, buf, strlen(buf));
1173                 if (ml_sock_gets(&sock, buf) < 0) {
1174                         *status = 4;
1175                         strcpy(dsn, "Connection broken during SMTP AUTH");
1176                         goto bail;
1177                 }
1178                 CtdlLogPrintf(CTDL_DEBUG, "<%s\n", buf);
1179                 if (buf[0] != '2') {
1180                         if (buf[0] == '4') {
1181                                 *status = 4;
1182                                 safestrncpy(dsn, &buf[4], 1023);
1183                                 goto bail;
1184                         }
1185                         else {
1186                                 *status = 5;
1187                                 safestrncpy(dsn, &buf[4], 1023);
1188                                 goto bail;
1189                         }
1190                 }
1191         }
1192
1193         /* previous command succeeded, now try the MAIL FROM: command */
1194         snprintf(buf, sizeof buf, "MAIL FROM:<%s>\r\n", envelope_from);
1195         CtdlLogPrintf(CTDL_DEBUG, ">%s", buf);
1196         sock_write(&sock, buf, strlen(buf));
1197         if (ml_sock_gets(&sock, buf) < 0) {
1198                 *status = 4;
1199                 strcpy(dsn, "Connection broken during SMTP MAIL");
1200                 goto bail;
1201         }
1202         CtdlLogPrintf(CTDL_DEBUG, "<%s\n", buf);
1203         if (buf[0] != '2') {
1204                 if (buf[0] == '4') {
1205                         *status = 4;
1206                         safestrncpy(dsn, &buf[4], 1023);
1207                         goto bail;
1208                 }
1209                 else {
1210                         *status = 5;
1211                         safestrncpy(dsn, &buf[4], 1023);
1212                         goto bail;
1213                 }
1214         }
1215
1216         /* MAIL succeeded, now try the RCPT To: command */
1217         snprintf(buf, sizeof buf, "RCPT TO:<%s@%s>\r\n", user, node);
1218         CtdlLogPrintf(CTDL_DEBUG, ">%s", buf);
1219         sock_write(&sock, buf, strlen(buf));
1220         if (ml_sock_gets(&sock, buf) < 0) {
1221                 *status = 4;
1222                 strcpy(dsn, "Connection broken during SMTP RCPT");
1223                 goto bail;
1224         }
1225         CtdlLogPrintf(CTDL_DEBUG, "<%s\n", buf);
1226         if (buf[0] != '2') {
1227                 if (buf[0] == '4') {
1228                         *status = 4;
1229                         safestrncpy(dsn, &buf[4], 1023);
1230                         goto bail;
1231                 }
1232                 else {
1233                         *status = 5;
1234                         safestrncpy(dsn, &buf[4], 1023);
1235                         goto bail;
1236                 }
1237         }
1238
1239         /* RCPT succeeded, now try the DATA command */
1240         CtdlLogPrintf(CTDL_DEBUG, ">DATA\n");
1241         sock_write(&sock, "DATA\r\n", 6);
1242         if (ml_sock_gets(&sock, buf) < 0) {
1243                 *status = 4;
1244                 strcpy(dsn, "Connection broken during SMTP DATA");
1245                 goto bail;
1246         }
1247         CtdlLogPrintf(CTDL_DEBUG, "<%s\n", buf);
1248         if (buf[0] != '3') {
1249                 if (buf[0] == '4') {
1250                         *status = 3;
1251                         safestrncpy(dsn, &buf[4], 1023);
1252                         goto bail;
1253                 }
1254                 else {
1255                         *status = 5;
1256                         safestrncpy(dsn, &buf[4], 1023);
1257                         goto bail;
1258                 }
1259         }
1260
1261         /* If we reach this point, the server is expecting data.*/
1262         sock_write(&sock, msgtext, msg_size);
1263         if (msgtext[msg_size-1] != 10) {
1264                 CtdlLogPrintf(CTDL_WARNING, "Possible problem: message did not "
1265                         "correctly terminate. (expecting 0x10, got 0x%02x)\n",
1266                                 buf[msg_size-1]);
1267                 sock_write(&sock, "\r\n", 2);
1268         }
1269
1270         sock_write(&sock, ".\r\n", 3);
1271         if (ml_sock_gets(&sock, buf) < 0) {
1272                 *status = 4;
1273                 strcpy(dsn, "Connection broken during SMTP message transmit");
1274                 goto bail;
1275         }
1276         CtdlLogPrintf(CTDL_DEBUG, "%s\n", buf);
1277         if (buf[0] != '2') {
1278                 if (buf[0] == '4') {
1279                         *status = 4;
1280                         safestrncpy(dsn, &buf[4], 1023);
1281                         goto bail;
1282                 }
1283                 else {
1284                         *status = 5;
1285                         safestrncpy(dsn, &buf[4], 1023);
1286                         goto bail;
1287                 }
1288         }
1289
1290         /* We did it! */
1291         safestrncpy(dsn, &buf[4], 1023);
1292         *status = 2;
1293
1294         CtdlLogPrintf(CTDL_DEBUG, ">QUIT\n");
1295         sock_write(&sock, "QUIT\r\n", 6);
1296         ml_sock_gets(&sock, buf);
1297         CtdlLogPrintf(CTDL_DEBUG, "<%s\n", buf);
1298         CtdlLogPrintf(CTDL_INFO, "SMTP client: delivery to <%s> @ <%s> (%s) succeeded\n",
1299                 user, node, name);
1300
1301 bail:   free(msgtext);
1302         FreeStrBuf(&CCC->sReadBuf);
1303         FreeStrBuf(&CCC->sMigrateBuf);
1304         if (sock != -1)
1305                 sock_close(sock);
1306
1307         /* Write something to the syslog (which may or may not be where the
1308          * rest of the Citadel logs are going; some sysadmins want LOG_MAIL).
1309          */
1310         if (enable_syslog) {
1311                 syslog((LOG_MAIL | LOG_INFO),
1312                         "%ld: to=<%s>, relay=%s, stat=%s",
1313                         msgnum,
1314                         addr,
1315                         mx_host,
1316                         dsn
1317                 );
1318         }
1319
1320         return;
1321 }
1322
1323
1324
1325 /*
1326  * smtp_do_bounce() is caled by smtp_do_procmsg() to scan a set of delivery
1327  * instructions for "5" codes (permanent fatal errors) and produce/deliver
1328  * a "bounce" message (delivery status notification).
1329  */
1330 void smtp_do_bounce(char *instr) {
1331         int i;
1332         int lines;
1333         int status;
1334         char buf[1024];
1335         char key[1024];
1336         char addr[1024];
1337         char dsn[1024];
1338         char bounceto[1024];
1339         char boundary[64];
1340         int num_bounces = 0;
1341         int bounce_this = 0;
1342         long bounce_msgid = (-1);
1343         time_t submitted = 0L;
1344         struct CtdlMessage *bmsg = NULL;
1345         int give_up = 0;
1346         struct recptypes *valid;
1347         int successful_bounce = 0;
1348         static int seq = 0;
1349         char *omsgtext;
1350         size_t omsgsize;
1351         long omsgid = (-1);
1352
1353         CtdlLogPrintf(CTDL_DEBUG, "smtp_do_bounce() called\n");
1354         strcpy(bounceto, "");
1355         sprintf(boundary, "=_Citadel_Multipart_%s_%04x%04x", config.c_fqdn, getpid(), ++seq);
1356         lines = num_tokens(instr, '\n');
1357
1358         /* See if it's time to give up on delivery of this message */
1359         for (i=0; i<lines; ++i) {
1360                 extract_token(buf, instr, i, '\n', sizeof buf);
1361                 extract_token(key, buf, 0, '|', sizeof key);
1362                 extract_token(addr, buf, 1, '|', sizeof addr);
1363                 if (!strcasecmp(key, "submitted")) {
1364                         submitted = atol(addr);
1365                 }
1366         }
1367
1368         if ( (time(NULL) - submitted) > SMTP_GIVE_UP ) {
1369                 give_up = 1;
1370         }
1371
1372         /* Start building our bounce message */
1373
1374         bmsg = (struct CtdlMessage *) malloc(sizeof(struct CtdlMessage));
1375         if (bmsg == NULL) return;
1376         memset(bmsg, 0, sizeof(struct CtdlMessage));
1377
1378         bmsg->cm_magic = CTDLMESSAGE_MAGIC;
1379         bmsg->cm_anon_type = MES_NORMAL;
1380         bmsg->cm_format_type = FMT_RFC822;
1381         bmsg->cm_fields['A'] = strdup("Citadel");
1382         bmsg->cm_fields['O'] = strdup(MAILROOM);
1383         bmsg->cm_fields['N'] = strdup(config.c_nodename);
1384         bmsg->cm_fields['U'] = strdup("Delivery Status Notification (Failure)");
1385         bmsg->cm_fields['M'] = malloc(1024);
1386
1387         strcpy(bmsg->cm_fields['M'], "Content-type: multipart/mixed; boundary=\"");
1388         strcat(bmsg->cm_fields['M'], boundary);
1389         strcat(bmsg->cm_fields['M'], "\"\r\n");
1390         strcat(bmsg->cm_fields['M'], "MIME-Version: 1.0\r\n");
1391         strcat(bmsg->cm_fields['M'], "X-Mailer: " CITADEL "\r\n");
1392         strcat(bmsg->cm_fields['M'], "\r\nThis is a multipart message in MIME format.\r\n\r\n");
1393         strcat(bmsg->cm_fields['M'], "--");
1394         strcat(bmsg->cm_fields['M'], boundary);
1395         strcat(bmsg->cm_fields['M'], "\r\n");
1396         strcat(bmsg->cm_fields['M'], "Content-type: text/plain\r\n\r\n");
1397
1398         if (give_up) strcat(bmsg->cm_fields['M'],
1399 "A message you sent could not be delivered to some or all of its recipients\n"
1400 "due to prolonged unavailability of its destination(s).\n"
1401 "Giving up on the following addresses:\n\n"
1402 );
1403
1404         else strcat(bmsg->cm_fields['M'],
1405 "A message you sent could not be delivered to some or all of its recipients.\n"
1406 "The following addresses were undeliverable:\n\n"
1407 );
1408
1409         /*
1410          * Now go through the instructions checking for stuff.
1411          */
1412         for (i=0; i<lines; ++i) {
1413                 extract_token(buf, instr, i, '\n', sizeof buf);
1414                 extract_token(key, buf, 0, '|', sizeof key);
1415                 extract_token(addr, buf, 1, '|', sizeof addr);
1416                 status = extract_int(buf, 2);
1417                 extract_token(dsn, buf, 3, '|', sizeof dsn);
1418                 bounce_this = 0;
1419
1420                 CtdlLogPrintf(CTDL_DEBUG, "key=<%s> addr=<%s> status=%d dsn=<%s>\n",
1421                         key, addr, status, dsn);
1422
1423                 if (!strcasecmp(key, "bounceto")) {
1424                         strcpy(bounceto, addr);
1425                 }
1426
1427                 if (!strcasecmp(key, "msgid")) {
1428                         omsgid = atol(addr);
1429                 }
1430
1431                 if (!strcasecmp(key, "remote")) {
1432                         if (status == 5) bounce_this = 1;
1433                         if (give_up) bounce_this = 1;
1434                 }
1435
1436                 if (bounce_this) {
1437                         ++num_bounces;
1438
1439                         if (bmsg->cm_fields['M'] == NULL) {
1440                                 CtdlLogPrintf(CTDL_ERR, "ERROR ... M field is null "
1441                                         "(%s:%d)\n", __FILE__, __LINE__);
1442                         }
1443
1444                         bmsg->cm_fields['M'] = realloc(bmsg->cm_fields['M'],
1445                                 strlen(bmsg->cm_fields['M']) + 1024 );
1446                         strcat(bmsg->cm_fields['M'], addr);
1447                         strcat(bmsg->cm_fields['M'], ": ");
1448                         strcat(bmsg->cm_fields['M'], dsn);
1449                         strcat(bmsg->cm_fields['M'], "\r\n");
1450
1451                         remove_token(instr, i, '\n');
1452                         --i;
1453                         --lines;
1454                 }
1455         }
1456
1457         /* Attach the original message */
1458         if (omsgid >= 0) {
1459                 strcat(bmsg->cm_fields['M'], "--");
1460                 strcat(bmsg->cm_fields['M'], boundary);
1461                 strcat(bmsg->cm_fields['M'], "\r\n");
1462                 strcat(bmsg->cm_fields['M'], "Content-type: message/rfc822\r\n");
1463                 strcat(bmsg->cm_fields['M'], "Content-Transfer-Encoding: 7bit\r\n");
1464                 strcat(bmsg->cm_fields['M'], "Content-Disposition: inline\r\n");
1465                 strcat(bmsg->cm_fields['M'], "\r\n");
1466
1467                 CC->redirect_buffer = malloc(SIZ);
1468                 CC->redirect_len = 0;
1469                 CC->redirect_alloc = SIZ;
1470                 CtdlOutputMsg(omsgid, MT_RFC822, HEADERS_ALL, 0, 1, NULL, 0);
1471                 omsgtext = CC->redirect_buffer;
1472                 omsgsize = CC->redirect_len;
1473                 CC->redirect_buffer = NULL;
1474                 CC->redirect_len = 0;
1475                 CC->redirect_alloc = 0;
1476                 bmsg->cm_fields['M'] = realloc(bmsg->cm_fields['M'],
1477                                 (strlen(bmsg->cm_fields['M']) + omsgsize + 1024) );
1478                 strcat(bmsg->cm_fields['M'], omsgtext);
1479                 free(omsgtext);
1480         }
1481
1482         /* Close the multipart MIME scope */
1483         strcat(bmsg->cm_fields['M'], "--");
1484         strcat(bmsg->cm_fields['M'], boundary);
1485         strcat(bmsg->cm_fields['M'], "--\r\n");
1486
1487         /* Deliver the bounce if there's anything worth mentioning */
1488         CtdlLogPrintf(CTDL_DEBUG, "num_bounces = %d\n", num_bounces);
1489         if (num_bounces > 0) {
1490
1491                 /* First try the user who sent the message */
1492                 CtdlLogPrintf(CTDL_DEBUG, "bounce to user? <%s>\n", bounceto);
1493                 if (IsEmptyStr(bounceto)) {
1494                         CtdlLogPrintf(CTDL_ERR, "No bounce address specified\n");
1495                         bounce_msgid = (-1L);
1496                 }
1497
1498                 /* Can we deliver the bounce to the original sender? */
1499                 valid = validate_recipients(bounceto, smtp_get_Recipients (), 0);
1500                 if (valid != NULL) {
1501                         if (valid->num_error == 0) {
1502                                 CtdlSubmitMsg(bmsg, valid, "", QP_EADDR);
1503                                 successful_bounce = 1;
1504                         }
1505                 }
1506
1507                 /* If not, post it in the Aide> room */
1508                 if (successful_bounce == 0) {
1509                         CtdlSubmitMsg(bmsg, NULL, config.c_aideroom, QP_EADDR);
1510                 }
1511
1512                 /* Free up the memory we used */
1513                 if (valid != NULL) {
1514                         free_recipients(valid);
1515                 }
1516         }
1517
1518         CtdlFreeMessage(bmsg);
1519         CtdlLogPrintf(CTDL_DEBUG, "Done processing bounces\n");
1520 }
1521
1522
1523 /*
1524  * smtp_purge_completed_deliveries() is caled by smtp_do_procmsg() to scan a
1525  * set of delivery instructions for completed deliveries and remove them.
1526  *
1527  * It returns the number of incomplete deliveries remaining.
1528  */
1529 int smtp_purge_completed_deliveries(char *instr) {
1530         int i;
1531         int lines;
1532         int status;
1533         char buf[1024];
1534         char key[1024];
1535         char addr[1024];
1536         char dsn[1024];
1537         int completed;
1538         int incomplete = 0;
1539
1540         lines = num_tokens(instr, '\n');
1541         for (i=0; i<lines; ++i) {
1542                 extract_token(buf, instr, i, '\n', sizeof buf);
1543                 extract_token(key, buf, 0, '|', sizeof key);
1544                 extract_token(addr, buf, 1, '|', sizeof addr);
1545                 status = extract_int(buf, 2);
1546                 extract_token(dsn, buf, 3, '|', sizeof dsn);
1547
1548                 completed = 0;
1549
1550                 if (!strcasecmp(key, "remote")) {
1551                         if (status == 2) completed = 1;
1552                         else ++incomplete;
1553                 }
1554
1555                 if (completed) {
1556                         remove_token(instr, i, '\n');
1557                         --i;
1558                         --lines;
1559                 }
1560         }
1561
1562         return(incomplete);
1563 }
1564
1565
1566 /*
1567  * smtp_do_procmsg()
1568  *
1569  * Called by smtp_do_queue() to handle an individual message.
1570  */
1571 void smtp_do_procmsg(long msgnum, void *userdata) {
1572         struct CtdlMessage *msg = NULL;
1573         char *instr = NULL;
1574         char *results = NULL;
1575         int i;
1576         int lines;
1577         int status;
1578         char buf[1024];
1579         char key[1024];
1580         char addr[1024];
1581         char dsn[1024];
1582         char envelope_from[1024];
1583         long text_msgid = (-1);
1584         int incomplete_deliveries_remaining;
1585         time_t attempted = 0L;
1586         time_t last_attempted = 0L;
1587         time_t retry = SMTP_RETRY_INTERVAL;
1588
1589         CtdlLogPrintf(CTDL_DEBUG, "SMTP client: smtp_do_procmsg(%ld)\n", msgnum);
1590         strcpy(envelope_from, "");
1591
1592         msg = CtdlFetchMessage(msgnum, 1);
1593         if (msg == NULL) {
1594                 CtdlLogPrintf(CTDL_ERR, "SMTP client: tried %ld but no such message!\n", msgnum);
1595                 return;
1596         }
1597
1598         instr = strdup(msg->cm_fields['M']);
1599         CtdlFreeMessage(msg);
1600
1601         /* Strip out the headers amd any other non-instruction line */
1602         lines = num_tokens(instr, '\n');
1603         for (i=0; i<lines; ++i) {
1604                 extract_token(buf, instr, i, '\n', sizeof buf);
1605                 if (num_tokens(buf, '|') < 2) {
1606                         remove_token(instr, i, '\n');
1607                         --lines;
1608                         --i;
1609                 }
1610         }
1611
1612         /* Learn the message ID and find out about recent delivery attempts */
1613         lines = num_tokens(instr, '\n');
1614         for (i=0; i<lines; ++i) {
1615                 extract_token(buf, instr, i, '\n', sizeof buf);
1616                 extract_token(key, buf, 0, '|', sizeof key);
1617                 if (!strcasecmp(key, "msgid")) {
1618                         text_msgid = extract_long(buf, 1);
1619                 }
1620                 if (!strcasecmp(key, "envelope_from")) {
1621                         extract_token(envelope_from, buf, 1, '|', sizeof envelope_from);
1622                 }
1623                 if (!strcasecmp(key, "retry")) {
1624                         /* double the retry interval after each attempt */
1625                         retry = extract_long(buf, 1) * 2L;
1626                         if (retry > SMTP_RETRY_MAX) {
1627                                 retry = SMTP_RETRY_MAX;
1628                         }
1629                         remove_token(instr, i, '\n');
1630                 }
1631                 if (!strcasecmp(key, "attempted")) {
1632                         attempted = extract_long(buf, 1);
1633                         if (attempted > last_attempted)
1634                                 last_attempted = attempted;
1635                 }
1636         }
1637
1638         /*
1639          * Postpone delivery if we've already tried recently.
1640          */
1641         if (((time(NULL) - last_attempted) < retry) && (run_queue_now == 0)) {
1642                 CtdlLogPrintf(CTDL_DEBUG, "SMTP client: Retry time not yet reached.\n");
1643                 free(instr);
1644                 return;
1645         }
1646
1647
1648         /*
1649          * Bail out if there's no actual message associated with this
1650          */
1651         if (text_msgid < 0L) {
1652                 CtdlLogPrintf(CTDL_ERR, "SMTP client: no 'msgid' directive found!\n");
1653                 free(instr);
1654                 return;
1655         }
1656
1657         /* Plow through the instructions looking for 'remote' directives and
1658          * a status of 0 (no delivery yet attempted) or 3/4 (transient errors
1659          * were experienced and it's time to try again)
1660          */
1661         lines = num_tokens(instr, '\n');
1662         for (i=0; i<lines; ++i) {
1663                 extract_token(buf, instr, i, '\n', sizeof buf);
1664                 extract_token(key, buf, 0, '|', sizeof key);
1665                 extract_token(addr, buf, 1, '|', sizeof addr);
1666                 status = extract_int(buf, 2);
1667                 extract_token(dsn, buf, 3, '|', sizeof dsn);
1668                 if ( (!strcasecmp(key, "remote"))
1669                    && ((status==0)||(status==3)||(status==4)) ) {
1670
1671                         /* Remove this "remote" instruction from the set,
1672                          * but replace the set's final newline if
1673                          * remove_token() stripped it.  It has to be there.
1674                          */
1675                         remove_token(instr, i, '\n');
1676                         if (instr[strlen(instr)-1] != '\n') {
1677                                 strcat(instr, "\n");
1678                         }
1679
1680                         --i;
1681                         --lines;
1682                         CtdlLogPrintf(CTDL_DEBUG, "SMTP client: Trying <%s>\n", addr);
1683                         smtp_try(key, addr, &status, dsn, sizeof dsn, text_msgid, envelope_from);
1684                         if (status != 2) {
1685                                 if (results == NULL) {
1686                                         results = malloc(1024);
1687                                         memset(results, 0, 1024);
1688                                 }
1689                                 else {
1690                                         results = realloc(results, strlen(results) + 1024);
1691                                 }
1692                                 snprintf(&results[strlen(results)], 1024,
1693                                         "%s|%s|%d|%s\n",
1694                                         key, addr, status, dsn);
1695                         }
1696                 }
1697         }
1698
1699         if (results != NULL) {
1700                 instr = realloc(instr, strlen(instr) + strlen(results) + 2);
1701                 strcat(instr, results);
1702                 free(results);
1703         }
1704
1705
1706         /* Generate 'bounce' messages */
1707         smtp_do_bounce(instr);
1708
1709         /* Go through the delivery list, deleting completed deliveries */
1710         incomplete_deliveries_remaining =
1711                 smtp_purge_completed_deliveries(instr);
1712
1713
1714         /*
1715          * No delivery instructions remain, so delete both the instructions
1716          * message and the message message.
1717          */
1718         if (incomplete_deliveries_remaining <= 0) {
1719                 long delmsgs[2];
1720                 delmsgs[0] = msgnum;
1721                 delmsgs[1] = text_msgid;
1722                 CtdlDeleteMessages(SMTP_SPOOLOUT_ROOM, delmsgs, 2, "");
1723         }
1724
1725         /*
1726          * Uncompleted delivery instructions remain, so delete the old
1727          * instructions and replace with the updated ones.
1728          */
1729         if (incomplete_deliveries_remaining > 0) {
1730                 CtdlDeleteMessages(SMTP_SPOOLOUT_ROOM, &msgnum, 1, "");
1731                 msg = malloc(sizeof(struct CtdlMessage));
1732                 memset(msg, 0, sizeof(struct CtdlMessage));
1733                 msg->cm_magic = CTDLMESSAGE_MAGIC;
1734                 msg->cm_anon_type = MES_NORMAL;
1735                 msg->cm_format_type = FMT_RFC822;
1736                 msg->cm_fields['M'] = malloc(strlen(instr)+SIZ);
1737                 snprintf(msg->cm_fields['M'],
1738                         strlen(instr)+SIZ,
1739                         "Content-type: %s\n\n%s\n"
1740                         "attempted|%ld\n"
1741                         "retry|%ld\n",
1742                         SPOOLMIME, instr, (long)time(NULL), (long)retry );
1743                 CtdlSubmitMsg(msg, NULL, SMTP_SPOOLOUT_ROOM, QP_EADDR);
1744                 CtdlFreeMessage(msg);
1745         }
1746
1747         free(instr);
1748 }
1749
1750
1751
1752
1753 /*
1754  * smtp_do_queue()
1755  *
1756  * Run through the queue sending out messages.
1757  */
1758 void *smtp_do_queue(void *arg) {
1759         int num_processed = 0;
1760         struct CitContext smtp_queue_CC;
1761
1762         CtdlLogPrintf(CTDL_INFO, "SMTP client: processing outbound queue\n");
1763
1764         CtdlFillSystemContext(&smtp_queue_CC, "SMTP Send");
1765         citthread_setspecific(MyConKey, (void *)&smtp_queue_CC );
1766
1767         if (CtdlGetRoom(&CC->room, SMTP_SPOOLOUT_ROOM) != 0) {
1768                 CtdlLogPrintf(CTDL_ERR, "Cannot find room <%s>\n", SMTP_SPOOLOUT_ROOM);
1769         }
1770         else {
1771                 num_processed = CtdlForEachMessage(MSGS_ALL, 0L, NULL, SPOOLMIME, NULL, smtp_do_procmsg, NULL);
1772         }
1773
1774         citthread_mutex_unlock (&smtp_send_lock);
1775         CtdlLogPrintf(CTDL_INFO, "SMTP client: queue run completed; %d messages processed\n", num_processed);
1776         return(NULL);
1777 }
1778
1779
1780
1781 /*
1782  * smtp_queue_thread
1783  *
1784  * Create a thread to run the SMTP queue
1785  *
1786  * This was created as a response to a situation seen on Uncensored where a bad remote was holding
1787  * up SMTP sending for long times.
1788  * Converting to a thread does not fix the problem caused by the bad remote but it does prevent
1789  * the SMTP sending from stopping housekeeping and the EVT_TIMER event system which in turn prevented
1790  * other things from happening.
1791  */
1792 void smtp_queue_thread (void)
1793 {
1794         if (citthread_mutex_trylock (&smtp_send_lock)) {
1795                 CtdlLogPrintf(CTDL_DEBUG, "SMTP queue run already in progress\n");
1796         }
1797         else {
1798                 CtdlThreadCreate("SMTP Send", CTDLTHREAD_BIGSTACK, smtp_do_queue, NULL);
1799         }
1800 }
1801
1802
1803
1804 void smtp_server_going_down (void)
1805 {
1806         CtdlLogPrintf(CTDL_DEBUG, "SMTP module clean up for shutdown.\n");
1807
1808         citthread_mutex_destroy (&smtp_send_lock);
1809 }
1810
1811
1812
1813 /*****************************************************************************/
1814 /*                          SMTP UTILITY COMMANDS                            */
1815 /*****************************************************************************/
1816
1817 void cmd_smtp(char *argbuf) {
1818         char cmd[64];
1819         char node[256];
1820         char buf[1024];
1821         int i;
1822         int num_mxhosts;
1823
1824         if (CtdlAccessCheck(ac_aide)) return;
1825
1826         extract_token(cmd, argbuf, 0, '|', sizeof cmd);
1827
1828         if (!strcasecmp(cmd, "mx")) {
1829                 extract_token(node, argbuf, 1, '|', sizeof node);
1830                 num_mxhosts = getmx(buf, node);
1831                 cprintf("%d %d MX hosts listed for %s\n",
1832                         LISTING_FOLLOWS, num_mxhosts, node);
1833                 for (i=0; i<num_mxhosts; ++i) {
1834                         extract_token(node, buf, i, '|', sizeof node);
1835                         cprintf("%s\n", node);
1836                 }
1837                 cprintf("000\n");
1838                 return;
1839         }
1840
1841         else if (!strcasecmp(cmd, "runqueue")) {
1842                 run_queue_now = 1;
1843                 cprintf("%d All outbound SMTP will be retried now.\n", CIT_OK);
1844                 return;
1845         }
1846
1847         else {
1848                 cprintf("%d Invalid command.\n", ERROR + ILLEGAL_VALUE);
1849         }
1850
1851 }
1852
1853
1854 /*
1855  * Initialize the SMTP outbound queue
1856  */
1857 void smtp_init_spoolout(void) {
1858         struct ctdlroom qrbuf;
1859
1860         /*
1861          * Create the room.  This will silently fail if the room already
1862          * exists, and that's perfectly ok, because we want it to exist.
1863          */
1864         CtdlCreateRoom(SMTP_SPOOLOUT_ROOM, 3, "", 0, 1, 0, VIEW_MAILBOX);
1865
1866         /*
1867          * Make sure it's set to be a "system room" so it doesn't show up
1868          * in the <K>nown rooms list for Aides.
1869          */
1870         if (CtdlGetRoomLock(&qrbuf, SMTP_SPOOLOUT_ROOM) == 0) {
1871                 qrbuf.QRflags2 |= QR2_SYSTEM;
1872                 CtdlPutRoomLock(&qrbuf);
1873         }
1874 }
1875
1876
1877
1878
1879 /*****************************************************************************/
1880 /*                      MODULE INITIALIZATION STUFF                          */
1881 /*****************************************************************************/
1882 /*
1883  * This cleanup function blows away the temporary memory used by
1884  * the SMTP server.
1885  */
1886 void smtp_cleanup_function(void) {
1887
1888         /* Don't do this stuff if this is not an SMTP session! */
1889         if (CC->h_command_function != smtp_command_loop) return;
1890
1891         CtdlLogPrintf(CTDL_DEBUG, "Performing SMTP cleanup hook\n");
1892         free(SMTP);
1893 }
1894
1895
1896
1897 const char *CitadelServiceSMTP_MTA="SMTP-MTA";
1898 const char *CitadelServiceSMTPS_MTA="SMTPs-MTA";
1899 const char *CitadelServiceSMTP_MSA="SMTP-MSA";
1900 const char *CitadelServiceSMTP_LMTP="LMTP";
1901 const char *CitadelServiceSMTP_LMTP_UNF="LMTP-UnF";
1902
1903 CTDL_MODULE_INIT(smtp)
1904 {
1905         if (!threading)
1906         {
1907                 CtdlRegisterServiceHook(config.c_smtp_port,     /* SMTP MTA */
1908                                         NULL,
1909                                         smtp_mta_greeting,
1910                                         smtp_command_loop,
1911                                         NULL,
1912                                         CitadelServiceSMTP_MTA);
1913
1914 #ifdef HAVE_OPENSSL
1915                 CtdlRegisterServiceHook(config.c_smtps_port,
1916                                         NULL,
1917                                         smtps_greeting,
1918                                         smtp_command_loop,
1919                                         NULL,
1920                                         CitadelServiceSMTPS_MTA);
1921 #endif
1922
1923                 CtdlRegisterServiceHook(config.c_msa_port,      /* SMTP MSA */
1924                                         NULL,
1925                                         smtp_msa_greeting,
1926                                         smtp_command_loop,
1927                                         NULL,
1928                                         CitadelServiceSMTP_MSA);
1929
1930                 CtdlRegisterServiceHook(0,                      /* local LMTP */
1931                                         file_lmtp_socket,
1932                                         lmtp_greeting,
1933                                         smtp_command_loop,
1934                                         NULL,
1935                                         CitadelServiceSMTP_LMTP);
1936
1937                 CtdlRegisterServiceHook(0,                      /* local LMTP */
1938                                         file_lmtp_unfiltered_socket,
1939                                         lmtp_unfiltered_greeting,
1940                                         smtp_command_loop,
1941                                         NULL,
1942                                         CitadelServiceSMTP_LMTP_UNF);
1943
1944                 smtp_init_spoolout();
1945                 CtdlRegisterSessionHook(smtp_queue_thread, EVT_TIMER);
1946                 CtdlRegisterSessionHook(smtp_cleanup_function, EVT_STOP);
1947                 CtdlRegisterProtoHook(cmd_smtp, "SMTP", "SMTP utility commands");
1948                 CtdlRegisterCleanupHook (smtp_server_going_down);
1949                 citthread_mutex_init (&smtp_send_lock, NULL);
1950         }
1951
1952         /* return our Subversion id for the Log */
1953         return "$Id$";
1954 }