citadel/serv_smtp.c

   1 /* $Id$ */
   2
   3 #include "sysdep.h"
   4 #include <stdlib.h>
   5 #include <unistd.h>
   6 #include <stdio.h>
   7 #include <fcntl.h>
   8 #include <signal.h>
   9 #include <pwd.h>
  10 #include <errno.h>
  11 #include <sys/types.h>
  12 #include <sys/time.h>
  13 #include <sys/wait.h>
  14 #include <string.h>
  15 #include <limits.h>
  16 #include "citadel.h"
  17 #include "server.h"
  18 #include <time.h>
  19 #include "sysdep_decls.h"
  20 #include "citserver.h"
  21 #include "support.h"
  22 #include "config.h"
  23 #include "dynloader.h"
  24 #include "room_ops.h"
  25 #include "user_ops.h"
  26 #include "policy.h"
  27 #include "database.h"
  28 #include "msgbase.h"
  29 #include "tools.h"
  30 #include "internet_addressing.h"
  31 #include "genstamp.h"
  32 #include "domain.h"
  33 #include "clientsocket.h"
  34
  35
  36 struct citsmtp {                /* Information about the current session */
  37         int command_state;
  38         char helo_node[256];
  39         struct usersupp vrfy_buffer;
  40         int vrfy_count;
  41         char vrfy_match[256];
  42         char from[256];
  43         int number_of_recipients;
  44         int delivery_mode;
  45 };
  46
  47 enum {                          /* Command states for login authentication */
  48         smtp_command,
  49         smtp_user,
  50         smtp_password
  51 };
  52
  53 enum {                          /* Delivery modes */
  54         smtp_deliver_local,
  55         smtp_deliver_remote
  56 };
  57
  58 #define SMTP            ((struct citsmtp *)CtdlGetUserData(SYM_SMTP))
  59 #define SMTP_RECP       ((char *)CtdlGetUserData(SYM_SMTP_RECP))
  60
  61 long SYM_SMTP;
  62 long SYM_SMTP_RECP;
  63
  64
  65
  66 /*****************************************************************************/
  67 /*                      SMTP SERVER (INBOUND) STUFF                          */
  68 /*****************************************************************************/
  69
  70
  71
  72
  73 /*
  74  * Here's where our SMTP session begins its happy day.
  75  */
  76 void smtp_greeting(void) {
  77
  78         strcpy(CC->cs_clientname, "SMTP session");
  79         CC->internal_pgm = 1;
  80         CC->cs_flags |= CS_STEALTH;
  81         CtdlAllocUserData(SYM_SMTP, sizeof(struct citsmtp));
  82         CtdlAllocUserData(SYM_SMTP_RECP, 256);
  83         sprintf(SMTP_RECP, "%s", "");
  84
  85         cprintf("220 Welcome to the Citadel/UX ESMTP server at %s\r\n",
  86                 config.c_fqdn);
  87 }
  88
  89
  90 /*
  91  * Implement HELO and EHLO commands.
  92  */
  93 void smtp_hello(char *argbuf, int is_esmtp) {
  94
  95         safestrncpy(SMTP->helo_node, argbuf, sizeof SMTP->helo_node);
  96
  97         if (!is_esmtp) {
  98                 cprintf("250 Greetings and joyous salutations.\r\n");
  99         }
 100         else {
 101                 cprintf("250-Greetings and joyous salutations.\r\n");
 102                 cprintf("250-HELP\r\n");
 103                 cprintf("250-SIZE %ld\r\n", config.c_maxmsglen);
 104                 cprintf("250 AUTH=LOGIN\r\n");
 105         }
 106 }
 107
 108
 109 /*
 110  * Implement HELP command.
 111  */
 112 void smtp_help(void) {
 113         cprintf("214-Here's the frequency, Kenneth:\r\n");
 114         cprintf("214-    DATA\r\n");
 115         cprintf("214-    EHLO\r\n");
 116         cprintf("214-    EXPN\r\n");
 117         cprintf("214-    HELO\r\n");
 118         cprintf("214-    HELP\r\n");
 119         cprintf("214-    MAIL\r\n");
 120         cprintf("214-    NOOP\r\n");
 121         cprintf("214-    QUIT\r\n");
 122         cprintf("214-    RCPT\r\n");
 123         cprintf("214-    RSET\r\n");
 124         cprintf("214-    VRFY\r\n");
 125         cprintf("214 I could tell you more, but then I'd have to kill you.\r\n");
 126 }
 127
 128
 129 /*
 130  *
 131  */
 132 void smtp_get_user(char *argbuf) {
 133         char buf[256];
 134         char username[256];
 135
 136         decode_base64(username, argbuf);
 137         lprintf(9, "Trying <%s>\n", username);
 138         if (CtdlLoginExistingUser(username) == login_ok) {
 139                 encode_base64(buf, "Password:");
 140                 cprintf("334 %s\r\n", buf);
 141                 SMTP->command_state = smtp_password;
 142         }
 143         else {
 144                 cprintf("500 No such user.\r\n");
 145                 SMTP->command_state = smtp_command;
 146         }
 147 }
 148
 149
 150 /*
 151  *
 152  */
 153 void smtp_get_pass(char *argbuf) {
 154         char password[256];
 155
 156         decode_base64(password, argbuf);
 157         lprintf(9, "Trying <%s>\n", password);
 158         if (CtdlTryPassword(password) == pass_ok) {
 159                 cprintf("235 Authentication successful.\r\n");
 160                 lprintf(9, "SMTP authenticated login successful\n");
 161                 CC->internal_pgm = 0;
 162                 CC->cs_flags &= ~CS_STEALTH;
 163         }
 164         else {
 165                 cprintf("500 Authentication failed.\r\n");
 166         }
 167         SMTP->command_state = smtp_command;
 168 }
 169
 170
 171 /*
 172  *
 173  */
 174 void smtp_auth(char *argbuf) {
 175         char buf[256];
 176
 177         if (strncasecmp(argbuf, "login", 5) ) {
 178                 cprintf("550 We only support LOGIN authentication.\r\n");
 179                 return;
 180         }
 181
 182         if (strlen(argbuf) >= 7) {
 183                 smtp_get_user(&argbuf[6]);
 184         }
 185
 186         else {
 187                 encode_base64(buf, "Username:");
 188                 cprintf("334 %s\r\n", buf);
 189                 SMTP->command_state = smtp_user;
 190         }
 191 }
 192
 193
 194 /*
 195  * Back end for smtp_vrfy() command
 196  */
 197 void smtp_vrfy_backend(struct usersupp *us, void *data) {
 198
 199         if (!fuzzy_match(us, SMTP->vrfy_match)) {
 200                 ++SMTP->vrfy_count;
 201                 memcpy(&SMTP->vrfy_buffer, us, sizeof(struct usersupp));
 202         }
 203 }
 204
 205
 206 /*
 207  * Implements the VRFY (verify user name) command.
 208  * Performs fuzzy match on full user names.
 209  */
 210 void smtp_vrfy(char *argbuf) {
 211         SMTP->vrfy_count = 0;
 212         strcpy(SMTP->vrfy_match, argbuf);
 213         ForEachUser(smtp_vrfy_backend, NULL);
 214
 215         if (SMTP->vrfy_count < 1) {
 216                 cprintf("550 String does not match anything.\r\n");
 217         }
 218         else if (SMTP->vrfy_count == 1) {
 219                 cprintf("250 %s <cit%ld@%s>\r\n",
 220                         SMTP->vrfy_buffer.fullname,
 221                         SMTP->vrfy_buffer.usernum,
 222                         config.c_fqdn);
 223         }
 224         else if (SMTP->vrfy_count > 1) {
 225                 cprintf("553 Request ambiguous: %d users matched.\r\n",
 226                         SMTP->vrfy_count);
 227         }
 228
 229 }
 230
 231
 232
 233 /*
 234  * Back end for smtp_expn() command
 235  */
 236 void smtp_expn_backend(struct usersupp *us, void *data) {
 237
 238         if (!fuzzy_match(us, SMTP->vrfy_match)) {
 239
 240                 if (SMTP->vrfy_count >= 1) {
 241                         cprintf("250-%s <cit%ld@%s>\r\n",
 242                                 SMTP->vrfy_buffer.fullname,
 243                                 SMTP->vrfy_buffer.usernum,
 244                                 config.c_fqdn);
 245                 }
 246
 247                 ++SMTP->vrfy_count;
 248                 memcpy(&SMTP->vrfy_buffer, us, sizeof(struct usersupp));
 249         }
 250 }
 251
 252
 253 /*
 254  * Implements the EXPN (expand user name) command.
 255  * Performs fuzzy match on full user names.
 256  */
 257 void smtp_expn(char *argbuf) {
 258         SMTP->vrfy_count = 0;
 259         strcpy(SMTP->vrfy_match, argbuf);
 260         ForEachUser(smtp_expn_backend, NULL);
 261
 262         if (SMTP->vrfy_count < 1) {
 263                 cprintf("550 String does not match anything.\r\n");
 264         }
 265         else if (SMTP->vrfy_count >= 1) {
 266                 cprintf("250 %s <cit%ld@%s>\r\n",
 267                         SMTP->vrfy_buffer.fullname,
 268                         SMTP->vrfy_buffer.usernum,
 269                         config.c_fqdn);
 270         }
 271 }
 272
 273
 274 /*
 275  * Implements the RSET (reset state) command.
 276  * Currently this just zeroes out the state buffer.  If pointers to data
 277  * allocated with mallok() are ever placed in the state buffer, we have to
 278  * be sure to phree() them first!
 279  */
 280 void smtp_rset(void) {
 281         memset(SMTP, 0, sizeof(struct citsmtp));
 282         if (CC->logged_in) logout(CC);
 283         cprintf("250 Zap!\r\n");
 284 }
 285
 286
 287
 288 /*
 289  * Implements the "MAIL From:" command
 290  */
 291 void smtp_mail(char *argbuf) {
 292         char user[256];
 293         char node[256];
 294         int cvt;
 295
 296         if (strlen(SMTP->from) != 0) {
 297                 cprintf("503 Only one sender permitted\r\n");
 298                 return;
 299         }
 300
 301         if (strncasecmp(argbuf, "From:", 5)) {
 302                 cprintf("501 Syntax error\r\n");
 303                 return;
 304         }
 305
 306         strcpy(SMTP->from, &argbuf[5]);
 307         striplt(SMTP->from);
 308
 309         if (strlen(SMTP->from) == 0) {
 310                 cprintf("501 Empty sender name is not permitted\r\n");
 311                 return;
 312         }
 313
 314
 315         /* If this SMTP connection is from a logged-in user, make sure that
 316          * the user only sends email from his/her own address.
 317          */
 318         if (CC->logged_in) {
 319                 cvt = convert_internet_address(user, node, SMTP->from);
 320                 lprintf(9, "cvt=%d, citaddr=<%s@%s>\n", cvt, user, node);
 321                 if ( (cvt != 0) || (strcasecmp(user, CC->usersupp.fullname))) {
 322                         cprintf("550 <%s> is not your address.\r\n", SMTP->from);
 323                         strcpy(SMTP->from, "");
 324                         return;
 325                 }
 326         }
 327
 328         /* Otherwise, make sure outsiders aren't trying to forge mail from
 329          * this system.
 330          */
 331         else {
 332                 cvt = convert_internet_address(user, node, SMTP->from);
 333                 lprintf(9, "cvt=%d, citaddr=<%s@%s>\n", cvt, user, node);
 334                 if (CtdlHostAlias(node) == hostalias_localhost) {
 335                         cprintf("550 You must log in to send mail from %s\r\n",
 336                                 node);
 337                         strcpy(SMTP->from, "");
 338                         return;
 339                 }
 340         }
 341
 342         cprintf("250 Sender ok.  Groovy.\r\n");
 343 }
 344
 345
 346
 347 /*
 348  * Implements the "RCPT To:" command
 349  */
 350 void smtp_rcpt(char *argbuf) {
 351         int cvt;
 352         char user[256];
 353         char node[256];
 354         char recp[256];
 355         int is_spam = 0;        /* FIX implement anti-spamming */
 356
 357         if (strlen(SMTP->from) == 0) {
 358                 cprintf("503 MAIL first, then RCPT.  Duh.\r\n");
 359                 return;
 360         }
 361
 362         if (strncasecmp(argbuf, "To:", 3)) {
 363                 cprintf("501 Syntax error\r\n");
 364                 return;
 365         }
 366
 367         strcpy(recp, &argbuf[3]);
 368         striplt(recp);
 369         alias(recp);
 370
 371         cvt = convert_internet_address(user, node, recp);
 372         sprintf(recp, "%s@%s", user, node);
 373
 374
 375         switch(cvt) {
 376                 case rfc822_address_locally_validated:
 377                         cprintf("250 %s is a valid recipient.\r\n", user);
 378                         ++SMTP->number_of_recipients;
 379                         CtdlReallocUserData(SYM_SMTP_RECP,
 380                                 strlen(SMTP_RECP) + 1024 );
 381                         strcat(SMTP_RECP, "local|");
 382                         strcat(SMTP_RECP, user);
 383                         strcat(SMTP_RECP, "|0\n");
 384                         return;
 385
 386                 case rfc822_room_delivery:
 387                         cprintf("250 Delivering to room '%s'\r\n", user);
 388                         ++SMTP->number_of_recipients;
 389                         CtdlReallocUserData(SYM_SMTP_RECP,
 390                                 strlen(SMTP_RECP) + 1024 );
 391                         strcat(SMTP_RECP, "room|");
 392                         strcat(SMTP_RECP, user);
 393                         strcat(SMTP_RECP, "|0|\n");
 394                         return;
 395
 396                 case rfc822_no_such_user:
 397                         cprintf("550 %s: no such user\r\n", recp);
 398                         return;
 399
 400                 case rfc822_address_invalid:
 401                         if (is_spam) {
 402                                 cprintf("551 Away with thee, spammer!\r\n");
 403                         }
 404                         else {
 405                                 cprintf("250 Remote recipient %s ok\r\n", recp);
 406                                 ++SMTP->number_of_recipients;
 407                                 CtdlReallocUserData(SYM_SMTP_RECP,
 408                                         strlen(SMTP_RECP) + 1024 );
 409                                 strcat(SMTP_RECP, "remote|");
 410                                 strcat(SMTP_RECP, recp);
 411                                 strcat(SMTP_RECP, "|0|\n");
 412                                 return;
 413                         }
 414                         return;
 415         }
 416
 417         cprintf("599 Unknown error\r\n");
 418 }
 419
 420
 421
 422
 423
 424 /*
 425  * Back end for smtp_data()  ... this does the actual delivery of the message
 426  * Returns 0 on success, nonzero on failure
 427  */
 428 int smtp_message_delivery(struct CtdlMessage *msg) {
 429         char user[1024];
 430         char node[1024];
 431         char name[1024];
 432         char buf[1024];
 433         char dtype[1024];
 434         char room[1024];
 435         int successful_saves = 0;       /* number of successful local saves */
 436         int failed_saves = 0;           /* number of failed deliveries */
 437         int remote_spools = 0;          /* number of copies to send out */
 438         long msgid = (-1L);
 439         int i;
 440         struct usersupp userbuf;
 441         char *instr;                    /* Remote delivery instructions */
 442         struct CtdlMessage *imsg;
 443
 444         lprintf(9, "smtp_message_delivery() called\n");
 445
 446         /* Fill in 'from' fields with envelope information if missing */
 447         process_rfc822_addr(SMTP->from, user, node, name);
 448         if (msg->cm_fields['A']==NULL) msg->cm_fields['A'] = strdoop(user);
 449         if (msg->cm_fields['N']==NULL) msg->cm_fields['N'] = strdoop(node);
 450         if (msg->cm_fields['H']==NULL) msg->cm_fields['H'] = strdoop(name);
 451
 452         /* Save the message in the queue */
 453         msgid = CtdlSaveMsg(msg,
 454                 "",
 455                 SMTP_SPOOLOUT_ROOM,
 456                 MES_LOCAL,
 457                 1);
 458         ++successful_saves;
 459
 460         instr = mallok(1024);
 461         sprintf(instr, "Content-type: %s\n\nmsgid|%ld\nsubmitted|%ld\n",
 462                 SPOOLMIME, msgid, time(NULL) );
 463
 464         for (i=0; i<SMTP->number_of_recipients; ++i) {
 465                 extract_token(buf, SMTP_RECP, i, '\n');
 466                 extract(dtype, buf, 0);
 467
 468                 /* Stuff local mailboxes */
 469                 if (!strcasecmp(dtype, "local")) {
 470                         extract(user, buf, 1);
 471                         if (getuser(&userbuf, user) == 0) {
 472                                 MailboxName(room, &userbuf, MAILROOM);
 473                                 CtdlSaveMsgPointerInRoom(room, msgid, 0);
 474                                 ++successful_saves;
 475                         }
 476                         else {
 477                                 ++failed_saves;
 478                         }
 479                 }
 480
 481                 /* Delivery to local non-mailbox rooms */
 482                 if (!strcasecmp(dtype, "room")) {
 483                         extract(room, buf, 1);
 484                         CtdlSaveMsgPointerInRoom(room, msgid, 0);
 485                         ++successful_saves;
 486                 }
 487
 488                 /* Remote delivery */
 489                 if (!strcasecmp(dtype, "remote")) {
 490                         extract(user, buf, 1);
 491                         instr = reallok(instr, strlen(instr) + 1024);
 492                         sprintf(&instr[strlen(instr)],
 493                                 "remote|%s|0\n",
 494                                 user);
 495                         ++remote_spools;
 496                 }
 497
 498         }
 499
 500         /* If there are remote spools to be done, save the instructions */
 501         if (remote_spools > 0) {
 502                 imsg = mallok(sizeof(struct CtdlMessage));
 503                 memset(imsg, 0, sizeof(struct CtdlMessage));
 504                 imsg->cm_magic = CTDLMESSAGE_MAGIC;
 505                 imsg->cm_anon_type = MES_NORMAL;
 506                 imsg->cm_format_type = FMT_RFC822;
 507                 imsg->cm_fields['M'] = instr;
 508                 CtdlSaveMsg(imsg, "", SMTP_SPOOLOUT_ROOM, MES_LOCAL, 1);
 509                 CtdlFreeMessage(imsg);
 510         }
 511
 512         /* If there are no remote spools, delete the message */
 513         else {
 514                 phree(instr);   /* only needed here, because CtdlSaveMsg()
 515                                  * would free this buffer otherwise */
 516                 CtdlDeleteMessages(SMTP_SPOOLOUT_ROOM, msgid, NULL);
 517         }
 518
 519         return(failed_saves);
 520 }
 521
 522
 523
 524 /*
 525  * Implements the DATA command
 526  */
 527 void smtp_data(void) {
 528         char *body;
 529         struct CtdlMessage *msg;
 530         int retval;
 531         char nowstamp[256];
 532
 533         if (strlen(SMTP->from) == 0) {
 534                 cprintf("503 Need MAIL command first.\r\n");
 535                 return;
 536         }
 537
 538         if (SMTP->number_of_recipients < 1) {
 539                 cprintf("503 Need RCPT command first.\r\n");
 540                 return;
 541         }
 542
 543         cprintf("354 Transmit message now; terminate with '.' by itself\r\n");
 544
 545         generate_rfc822_datestamp(nowstamp, time(NULL));
 546         body = mallok(4096);
 547
 548         if (body != NULL) sprintf(body,
 549                 "Received: from %s\n"
 550                 "       by %s;\n"
 551                 "       %s\n",
 552                         SMTP->helo_node,
 553                         config.c_fqdn,
 554                         nowstamp);
 555
 556         body = CtdlReadMessageBody(".", config.c_maxmsglen, body);
 557         if (body == NULL) {
 558                 cprintf("550 Unable to save message text: internal error.\r\n");
 559                 return;
 560         }
 561
 562         lprintf(9, "Converting message...\n");
 563         msg = convert_internet_message(body);
 564
 565         /* If the user is locally authenticated, FORCE the From: header to
 566          * show up as the real sender
 567          */
 568         if (CC->logged_in) {
 569                 if (msg->cm_fields['A'] != NULL) phree(msg->cm_fields['A']);
 570                 if (msg->cm_fields['N'] != NULL) phree(msg->cm_fields['N']);
 571                 if (msg->cm_fields['H'] != NULL) phree(msg->cm_fields['H']);
 572                 msg->cm_fields['A'] = strdoop(CC->usersupp.fullname);
 573                 msg->cm_fields['N'] = strdoop(config.c_nodename);
 574                 msg->cm_fields['H'] = strdoop(config.c_humannode);
 575         }
 576
 577         retval = smtp_message_delivery(msg);
 578         CtdlFreeMessage(msg);
 579
 580         if (!retval) {
 581                 cprintf("250 Message accepted for delivery.\r\n");
 582         }
 583         else {
 584                 cprintf("550 Internal delivery errors: %d\r\n", retval);
 585         }
 586 }
 587
 588
 589
 590
 591 /*
 592  * Main command loop for SMTP sessions.
 593  */
 594 void smtp_command_loop(void) {
 595         char cmdbuf[256];
 596
 597         time(&CC->lastcmd);
 598         memset(cmdbuf, 0, sizeof cmdbuf); /* Clear it, just in case */
 599         if (client_gets(cmdbuf) < 1) {
 600                 lprintf(3, "SMTP socket is broken.  Ending session.\n");
 601                 CC->kill_me = 1;
 602                 return;
 603         }
 604         lprintf(5, "citserver[%3d]: %s\n", CC->cs_pid, cmdbuf);
 605         while (strlen(cmdbuf) < 5) strcat(cmdbuf, " ");
 606
 607         if (SMTP->command_state == smtp_user) {
 608                 smtp_get_user(cmdbuf);
 609         }
 610
 611         else if (SMTP->command_state == smtp_password) {
 612                 smtp_get_pass(cmdbuf);
 613         }
 614
 615         else if (!strncasecmp(cmdbuf, "AUTH", 4)) {
 616                 smtp_auth(&cmdbuf[5]);
 617         }
 618
 619         else if (!strncasecmp(cmdbuf, "DATA", 4)) {
 620                 smtp_data();
 621         }
 622
 623         else if (!strncasecmp(cmdbuf, "EHLO", 4)) {
 624                 smtp_hello(&cmdbuf[5], 1);
 625         }
 626
 627         else if (!strncasecmp(cmdbuf, "EXPN", 4)) {
 628                 smtp_expn(&cmdbuf[5]);
 629         }
 630
 631         else if (!strncasecmp(cmdbuf, "HELO", 4)) {
 632                 smtp_hello(&cmdbuf[5], 0);
 633         }
 634
 635         else if (!strncasecmp(cmdbuf, "HELP", 4)) {
 636                 smtp_help();
 637         }
 638
 639         else if (!strncasecmp(cmdbuf, "MAIL", 4)) {
 640                 smtp_mail(&cmdbuf[5]);
 641         }
 642
 643         else if (!strncasecmp(cmdbuf, "NOOP", 4)) {
 644                 cprintf("250 This command successfully did nothing.\r\n");
 645         }
 646
 647         else if (!strncasecmp(cmdbuf, "QUIT", 4)) {
 648                 cprintf("221 Goodbye...\r\n");
 649                 CC->kill_me = 1;
 650                 return;
 651                 }
 652
 653         else if (!strncasecmp(cmdbuf, "RCPT", 4)) {
 654                 smtp_rcpt(&cmdbuf[5]);
 655         }
 656
 657         else if (!strncasecmp(cmdbuf, "RSET", 4)) {
 658                 smtp_rset();
 659         }
 660
 661         else if (!strncasecmp(cmdbuf, "VRFY", 4)) {
 662                 smtp_vrfy(&cmdbuf[5]);
 663         }
 664
 665         else {
 666                 cprintf("502 I'm sorry Dave, I'm afraid I can't do that.\r\n");
 667         }
 668
 669 }
 670
 671
 672
 673
 674 /*****************************************************************************/
 675 /*               SMTP CLIENT (OUTBOUND PROCESSING) STUFF                     */
 676 /*****************************************************************************/
 677
 678
 679
 680 /*
 681  * smtp_try()
 682  *
 683  * Called by smtp_do_procmsg() to attempt delivery to one SMTP host
 684  *
 685  */
 686 void smtp_try(char *key, char *addr, int *status, char *dsn, long msgnum)
 687 {
 688         char buf[256];
 689         int sock = (-1);
 690         char mxhosts[1024];
 691         int num_mxhosts;
 692         int mx;
 693         char user[256], node[256], name[256];
 694
 695         /* Parse out the host portion of the recipient address */
 696         process_rfc822_addr(addr, user, node, name);
 697         lprintf(9, "Attempting SMTP delivery to <%s> @ <%s> (%s)\n",
 698                 user, node, name);
 699
 700         num_mxhosts = getmx(mxhosts, node);
 701         lprintf(9, "Number of MX hosts for <%s> is %d\n", node, num_mxhosts);
 702         if (num_mxhosts < 1) {
 703                 *status = 5;
 704                 sprintf(dsn, "No MX hosts found for <%s>", node);
 705                 return;
 706         }
 707
 708         for (mx=0; mx<num_mxhosts; ++mx) {
 709                 extract(buf, mxhosts, mx);
 710                 lprintf(9, "Trying <%s>\n", buf);
 711                 sock = sock_connect(buf, "25", "tcp");
 712                 sprintf(dsn, "Could not connect: %s", strerror(errno));
 713                 if (sock >= 0) lprintf(9, "Connected!\n");
 714                 if (sock < 0) sprintf(dsn, "%s", strerror(errno));
 715                 if (sock >= 0) break;
 716         }
 717
 718         if (sock < 0) {
 719                 *status = 4;    /* dsn is already filled in */
 720                 return;
 721         }
 722
 723         /* Process the SMTP greeting from the server */
 724         if (sock_gets(sock, buf) < 0) {
 725                 *status = 4;
 726                 strcpy(dsn, "Connection broken during SMTP conversation");
 727                 sock_close(sock);
 728                 return;
 729         }
 730         lprintf(9, "%s\n", buf);
 731         if (buf[0] != '2') {
 732                 if (buf[0] == '4') {
 733                         *status = 4;
 734                         strcpy(dsn, &buf[4]);
 735                         sock_close(sock);
 736                         return;
 737                 }
 738                 else {
 739                         *status = 5;
 740                         strcpy(dsn, &buf[4]);
 741                         sock_close(sock);
 742                         return;
 743                 }
 744         }
 745
 746         /* At this point we know we are talking to a real SMTP server */
 747
 748         /* Do a HELO command */
 749         sprintf(buf, "HELO %s", config.c_fqdn);
 750         sock_puts(sock, buf);
 751         if (sock_gets(sock, buf) < 0) {
 752                 *status = 4;
 753                 strcpy(dsn, "Connection broken during SMTP conversation");
 754                 sock_close(sock);
 755                 return;
 756         }
 757         lprintf(9, "%s\n", buf);
 758         if (buf[0] != '2') {
 759                 if (buf[0] == '4') {
 760                         *status = 4;
 761                         strcpy(dsn, &buf[4]);
 762                         sock_close(sock);
 763                         return;
 764                 }
 765                 else {
 766                         *status = 5;
 767                         strcpy(dsn, &buf[4]);
 768                         sock_close(sock);
 769                         return;
 770                 }
 771         }
 772
 773
 774         /* HELO succeeded, now try the MAIL From: command */
 775         sprintf(buf, "MAIL From: FIX@uncnsrd.mt-kisco.ny.us"); /* FIX */
 776         sock_puts(sock, buf);
 777         if (sock_gets(sock, buf) < 0) {
 778                 *status = 4;
 779                 strcpy(dsn, "Connection broken during SMTP conversation");
 780                 sock_close(sock);
 781                 return;
 782         }
 783         lprintf(9, "%s\n", buf);
 784         if (buf[0] != '2') {
 785                 if (buf[0] == '4') {
 786                         *status = 4;
 787                         strcpy(dsn, &buf[4]);
 788                         sock_close(sock);
 789                         return;
 790                 }
 791                 else {
 792                         *status = 5;
 793                         strcpy(dsn, &buf[4]);
 794                         sock_close(sock);
 795                         return;
 796                 }
 797         }
 798
 799
 800         /* MAIL succeeded, now try the RCPT To: command */
 801         sprintf(buf, "RCPT To: %s", addr);
 802         sock_puts(sock, buf);
 803         if (sock_gets(sock, buf) < 0) {
 804                 *status = 4;
 805                 strcpy(dsn, "Connection broken during SMTP conversation");
 806                 sock_close(sock);
 807                 return;
 808         }
 809         lprintf(9, "%s\n", buf);
 810         if (buf[0] != '2') {
 811                 if (buf[0] == '4') {
 812                         *status = 4;
 813                         strcpy(dsn, &buf[4]);
 814                         sock_close(sock);
 815                         return;
 816                 }
 817                 else {
 818                         *status = 5;
 819                         strcpy(dsn, &buf[4]);
 820                         sock_close(sock);
 821                         return;
 822                 }
 823         }
 824
 825
 826         /* RCPT succeeded, now try the DATA command */
 827         sock_puts(sock, "DATA");
 828         if (sock_gets(sock, buf) < 0) {
 829                 *status = 4;
 830                 strcpy(dsn, "Connection broken during SMTP conversation");
 831                 sock_close(sock);
 832                 return;
 833         }
 834         lprintf(9, "%s\n", buf);
 835         if (buf[0] != '3') {
 836                 if (buf[0] == '4') {
 837                         *status = 3;
 838                         strcpy(dsn, &buf[4]);
 839                         sock_close(sock);
 840                         return;
 841                 }
 842                 else {
 843                         *status = 5;
 844                         strcpy(dsn, &buf[4]);
 845                         sock_close(sock);
 846                         return;
 847                 }
 848         }
 849
 850         /* If we reach this point, the server is expecting data */
 851         CtdlOutputMsg(msgnum, MT_RFC822, 0, 0, NULL, sock, 1);
 852         sock_puts(sock, ".");
 853         if (sock_gets(sock, buf) < 0) {
 854                 *status = 4;
 855                 strcpy(dsn, "Connection broken during SMTP conversation");
 856                 sock_close(sock);
 857                 return;
 858         }
 859         lprintf(9, "%s\n", buf);
 860         if (buf[0] != '2') {
 861                 if (buf[0] == '4') {
 862                         *status = 4;
 863                         strcpy(dsn, &buf[4]);
 864                         sock_close(sock);
 865                         return;
 866                 }
 867                 else {
 868                         *status = 5;
 869                         strcpy(dsn, &buf[4]);
 870                         sock_close(sock);
 871                         return;
 872                 }
 873         }
 874
 875         /* We did it! */
 876         strcpy(dsn, &buf[4]);
 877         *status = 2;
 878
 879         sock_puts(sock, "QUIT");
 880         sock_gets(sock, buf);
 881         lprintf(9, "%s\n", buf);
 882         sock_close(sock);
 883 }
 884
 885
 886
 887
 888 /*
 889  * smtp_do_procmsg()
 890  *
 891  * Called by smtp_do_queue() to handle an individual message.
 892  */
 893 void smtp_do_procmsg(long msgnum) {
 894         struct CtdlMessage *msg;
 895         char *instr = NULL;
 896         char *results = NULL;
 897         int i;
 898         int lines;
 899         int status;
 900         char buf[1024];
 901         char key[1024];
 902         char addr[1024];
 903         char dsn[1024];
 904         long text_msgid = (-1);
 905
 906         msg = CtdlFetchMessage(msgnum);
 907         if (msg == NULL) {
 908                 lprintf(3, "SMTP: tried %ld but no such message!\n", msgnum);
 909                 return;
 910         }
 911
 912         instr = strdoop(msg->cm_fields['M']);
 913         CtdlFreeMessage(msg);
 914
 915         /* Strip out the headers amd any other non-instruction line */
 916         lines = num_tokens(instr, '\n');
 917         for (i=0; i<lines; ++i) {
 918                 extract_token(buf, instr, i, '\n');
 919                 if (num_tokens(buf, '|') < 2) {
 920                         lprintf(9, "removing <%s>\n", buf);
 921                         remove_token(instr, i, '\n');
 922                         --lines;
 923                         --i;
 924                 }
 925         }
 926
 927         /* Learn the message ID */
 928         lines = num_tokens(instr, '\n');
 929         for (i=0; i<lines; ++i) {
 930                 extract_token(buf, instr, i, '\n');
 931                 extract(key, buf, 0);
 932                 if (!strcasecmp(key, "msgid")) {
 933                         text_msgid = extract_long(buf, 1);
 934                 }
 935         }
 936
 937         if (text_msgid < 0L) {
 938                 lprintf(3, "SMTP: no 'msgid' directive found!\n");
 939                 phree(instr);
 940                 return;
 941         }
 942
 943         /* Plow through the instructions looking for 'remote' directives and
 944          * a status of 0 (no delivery yet attempted) or 3 (transient errors
 945          * were experienced and it's time to try again)
 946          */
 947         lines = num_tokens(instr, '\n');
 948         for (i=0; i<lines; ++i) {
 949                 extract_token(buf, instr, i, '\n');
 950                 extract(key, buf, 0);
 951                 extract(addr, buf, 1);
 952                 status = extract_int(buf, 2);
 953                 extract(dsn, buf, 3);
 954                 if ( (!strcasecmp(key, "remote"))
 955                    && ((status==0)||(status==3)) ) {
 956                         remove_token(instr, i, '\n');
 957                         --i;
 958                         --lines;
 959                         lprintf(9, "SMTP: Trying <%s>\n", addr);
 960                         smtp_try(key, addr, &status, dsn, text_msgid);
 961                         if (status != 2) {
 962                                 if (results == NULL) {
 963                                         results = mallok(1024);
 964                                         memset(results, 0, 1024);
 965                                 }
 966                                 else {
 967                                         results = reallok(results,
 968                                                 strlen(results) + 1024);
 969                                 }
 970                                 sprintf(&results[strlen(results)],
 971                                         "%s|%s|%d|%s\n",
 972                                         key, addr, status, dsn);
 973                         }
 974                 }
 975         }
 976
 977         if (results != NULL) {
 978                 instr = reallok(instr, strlen(instr) + strlen(results) + 2);
 979                 strcat(instr, results);
 980                 phree(results);
 981         }
 982
 983         /* Delete the instructions and replace with the updated ones */
 984         CtdlDeleteMessages(SMTP_SPOOLOUT_ROOM, msgnum, NULL);
 985         msg = mallok(sizeof(struct CtdlMessage));
 986         memset(msg, 0, sizeof(struct CtdlMessage));
 987         msg->cm_magic = CTDLMESSAGE_MAGIC;
 988         msg->cm_anon_type = MES_NORMAL;
 989         msg->cm_format_type = FMT_RFC822;
 990         msg->cm_fields['M'] = malloc(strlen(instr)+256);
 991         sprintf(msg->cm_fields['M'],
 992                 "Content-type: %s\n\n%s\n", SPOOLMIME, instr);
 993         phree(instr);
 994         CtdlSaveMsg(msg, "", SMTP_SPOOLOUT_ROOM, MES_LOCAL, 1);
 995         CtdlFreeMessage(msg);
 996 }
 997
 998
 999
1000 /*
1001  * smtp_do_queue()
1002  *
1003  * Run through the queue sending out messages.
1004  */
1005 void smtp_do_queue(void) {
1006         lprintf(5, "SMTP: processing outbound queue\n");
1007
1008         if (getroom(&CC->quickroom, SMTP_SPOOLOUT_ROOM) != 0) {
1009                 lprintf(3, "Cannot find room <%s>\n", SMTP_SPOOLOUT_ROOM);
1010                 return;
1011         }
1012         CtdlForEachMessage(MSGS_ALL, 0L, SPOOLMIME, NULL, smtp_do_procmsg);
1013
1014         lprintf(5, "SMTP: queue run completed\n");
1015 }
1016
1017
1018 /**** FIX  temporary hack to run the queue *****/
1019 void cmd_qqqq(char *argbuf) {
1020         smtp_do_queue();
1021         cprintf("%d ok\n", OK);
1022 }
1023
1024
1025
1026 /*****************************************************************************/
1027 /*                      MODULE INITIALIZATION STUFF                          */
1028 /*****************************************************************************/
1029
1030
1031 char *Dynamic_Module_Init(void)
1032 {
1033         SYM_SMTP = CtdlGetDynamicSymbol();
1034         SYM_SMTP_RECP = CtdlGetDynamicSymbol();
1035         CtdlRegisterServiceHook(SMTP_PORT,
1036                                 smtp_greeting,
1037                                 smtp_command_loop);
1038
1039         /****  FIX ... temporary hack to run the queue ******/
1040         CtdlRegisterProtoHook(cmd_qqqq, "QQQQ", "run the queue");
1041
1042         create_room(SMTP_SPOOLOUT_ROOM, 3, "", 0);
1043         return "$Id$";
1044 }
1045