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