citadel/modules/smtp/smtp_clienthandlers.c

   1 /*
   2  * This module is an SMTP and ESMTP implementation for the Citadel system.
   3  * It is compliant with all of the following:
   4  *
   5  * RFC  821 - Simple Mail Transfer Protocol
   6  * RFC  876 - Survey of SMTP Implementations
   7  * RFC 1047 - Duplicate messages and SMTP
   8  * RFC 1652 - 8 bit MIME
   9  * RFC 1869 - Extended Simple Mail Transfer Protocol
  10  * RFC 1870 - SMTP Service Extension for Message Size Declaration
  11  * RFC 2033 - Local Mail Transfer Protocol
  12  * RFC 2197 - SMTP Service Extension for Command Pipelining
  13  * RFC 2476 - Message Submission
  14  * RFC 2487 - SMTP Service Extension for Secure SMTP over TLS
  15  * RFC 2554 - SMTP Service Extension for Authentication
  16  * RFC 2821 - Simple Mail Transfer Protocol
  17  * RFC 2822 - Internet Message Format
  18  * RFC 2920 - SMTP Service Extension for Command Pipelining
  19  *
  20  * Copyright (c) 1998-2012 by the citadel.org team
  21  *
  22  *  This program is open source software; you can redistribute it and/or modify
  23  *  it under the terms of the GNU General Public License version 3.
  24  *
  25  *
  26  *
  27  *  This program is distributed in the hope that it will be useful,
  28  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  29  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  30  *  GNU General Public License for more details.
  31  *
  32  *
  33  *
  34  *
  35  */
  36
  37 #include "sysdep.h"
  38 #include <stdlib.h>
  39 #include <unistd.h>
  40 #include <stdio.h>
  41 #include <termios.h>
  42 #include <fcntl.h>
  43 #include <signal.h>
  44 #include <pwd.h>
  45 #include <errno.h>
  46 #include <sys/types.h>
  47 #include <syslog.h>
  48
  49 #if TIME_WITH_SYS_TIME
  50 # include <sys/time.h>
  51 # include <time.h>
  52 #else
  53 # if HAVE_SYS_TIME_H
  54 #  include <sys/time.h>
  55 # else
  56 #  include <time.h>
  57 # endif
  58 #endif
  59 #include <sys/wait.h>
  60 #include <ctype.h>
  61 #include <string.h>
  62 #include <limits.h>
  63 #include <sys/socket.h>
  64 #include <netinet/in.h>
  65 #include <arpa/inet.h>
  66 #include <libcitadel.h>
  67 #include "citadel.h"
  68 #include "server.h"
  69 #include "citserver.h"
  70 #include "support.h"
  71 #include "config.h"
  72 #include "control.h"
  73 #include "user_ops.h"
  74 #include "database.h"
  75 #include "msgbase.h"
  76 #include "internet_addressing.h"
  77 #include "genstamp.h"
  78 #include "domain.h"
  79 #include "clientsocket.h"
  80 #include "locate_host.h"
  81 #include "citadel_dirs.h"
  82
  83 #include "ctdl_module.h"
  84
  85 #include "smtp_util.h"
  86 #include "event_client.h"
  87 #include "smtpqueue.h"
  88 #include "smtp_clienthandlers.h"
  89
  90
  91 #define SMTP_ERROR(WHICH_ERR, ERRSTR) do {                             \
  92                 Msg->MyQEntry->Status = WHICH_ERR;                     \
  93                 StrBufAppendBufPlain(Msg->MyQEntry->StatusMessage,     \
  94                                      HKEY(ERRSTR), 0);                 \
  95                 StrBufTrim(Msg->MyQEntry->StatusMessage);              \
  96                 return eAbort; }                                       \
  97         while (0)
  98
  99 #define SMTP_VERROR(WHICH_ERR) do {                            \
 100                 Msg->MyQEntry->Status = WHICH_ERR;             \
 101                 StrBufPlain(Msg->MyQEntry->StatusMessage,      \
 102                             ChrPtr(Msg->IO.IOBuf) + 4,         \
 103                             StrLength(Msg->IO.IOBuf) - 4);     \
 104                 StrBufTrim(Msg->MyQEntry->StatusMessage);      \
 105                 return eAbort; }                               \
 106         while (0)
 107
 108 #define SMTP_IS_STATE(WHICH_STATE) (ChrPtr(Msg->IO.IOBuf)[0] == WHICH_STATE)
 109
 110 #define SMTP_DBG_SEND() \
 111         EVS_syslog(LOG_DEBUG, "> %s\n", ChrPtr(Msg->IO.SendBuf.Buf))
 112
 113 #define SMTP_DBG_READ() \
 114         EVS_syslog(LOG_DEBUG, "< %s\n", ChrPtr(Msg->IO.IOBuf))
 115
 116 /*
 117  * if a Read handler wants to skip to a specific part use this macro.
 118  * the -1 is here since the auto-forward following has to be taken into account.
 119  */
 120 #define READ_NEXT_STATE(state) Msg->State = state - 1
 121
 122 /*****************************************************************************/
 123 /*                     SMTP CLIENT STATE CALLBACKS                           */
 124 /*****************************************************************************/
 125 eNextState SMTPC_read_greeting(SmtpOutMsg *Msg)
 126 {
 127         /* Process the SMTP greeting from the server */
 128         AsyncIO *IO = &Msg->IO;
 129         SMTP_DBG_READ();
 130         SetSMTPState(IO, eSTMPsmtp);
 131
 132         if (!SMTP_IS_STATE('2')) {
 133                 if (SMTP_IS_STATE('4'))
 134                         SMTP_VERROR(4);
 135                 else
 136                         SMTP_VERROR(5);
 137         }
 138         return eSendReply;
 139 }
 140
 141 eNextState SMTPC_send_EHLO(SmtpOutMsg *Msg)
 142 {
 143         AsyncIO *IO = &Msg->IO;
 144         /* At this point we know we are talking to a real SMTP server */
 145
 146         /* Do a EHLO command.  If it fails, try the HELO command. */
 147         StrBufPrintf(Msg->IO.SendBuf.Buf,
 148                      "EHLO %s\r\n", config.c_fqdn);
 149
 150         SMTP_DBG_SEND();
 151         return eReadMessage;
 152 }
 153
 154 eNextState SMTPC_read_EHLO_reply(SmtpOutMsg *Msg)
 155 {
 156         AsyncIO *IO = &Msg->IO;
 157         SMTP_DBG_READ();
 158
 159         if (SMTP_IS_STATE('2')) {
 160                 READ_NEXT_STATE(eSMTPAuth);
 161
 162                 if ((Msg->pCurrRelay == NULL) ||
 163                     (Msg->pCurrRelay->User == NULL))
 164                         READ_NEXT_STATE(eFROM); /* Skip auth... */
 165                 if (Msg->pCurrRelay != NULL)
 166                 {
 167                         if (strstr(ChrPtr(Msg->IO.IOBuf), "LOGIN") != NULL)
 168                                 Msg->SendLogin = 1;
 169                         else if ((Msg->MultiLineBuf != NULL) &&
 170                                  strstr(ChrPtr(Msg->MultiLineBuf), "LOGIN") != NULL)
 171                         {
 172                                 Msg->SendLogin = 1;
 173                         }
 174                 }
 175         }
 176         /* else we fall back to 'helo' */
 177         return eSendReply;
 178 }
 179
 180 eNextState STMPC_send_HELO(SmtpOutMsg *Msg)
 181 {
 182         AsyncIO *IO = &Msg->IO;
 183         StrBufPrintf(Msg->IO.SendBuf.Buf,
 184                      "HELO %s\r\n", config.c_fqdn);
 185
 186         SMTP_DBG_SEND();
 187         return eReadMessage;
 188 }
 189
 190 eNextState SMTPC_read_HELO_reply(SmtpOutMsg *Msg)
 191 {
 192         AsyncIO *IO = &Msg->IO;
 193         SMTP_DBG_READ();
 194
 195         if (!SMTP_IS_STATE('2'))
 196         {
 197                 if (SMTP_IS_STATE('4'))
 198                         SMTP_VERROR(4);
 199                 else
 200                         SMTP_VERROR(5);
 201         }
 202         if (Msg->pCurrRelay != NULL)
 203         {
 204                 if (strstr(ChrPtr(Msg->IO.IOBuf), "LOGIN") != NULL)
 205                         Msg->SendLogin = 1;
 206         }
 207         if ((Msg->pCurrRelay == NULL) ||
 208             (Msg->pCurrRelay->User == NULL))
 209                 READ_NEXT_STATE(eFROM); /* Skip auth... */
 210
 211         return eSendReply;
 212 }
 213
 214 eNextState SMTPC_send_auth(SmtpOutMsg *Msg)
 215 {
 216         AsyncIO *IO = &Msg->IO;
 217         char buf[SIZ];
 218         char encoded[1024];
 219
 220         if ((Msg->pCurrRelay == NULL) ||
 221             (Msg->pCurrRelay->User == NULL))
 222                 READ_NEXT_STATE(eFROM); /* Skip auth, shouldn't even come here!... */
 223         else {
 224                 /* Do an AUTH command if necessary */
 225                 if (Msg->SendLogin)
 226                 {
 227                         StrBufPlain(Msg->IO.SendBuf.Buf,
 228                                     HKEY("AUTH LOGIN\r\n"));
 229                 }
 230                 else
 231                 {
 232                         sprintf(buf, "%s%c%s%c%s",
 233                                 Msg->pCurrRelay->User, '\0',
 234                                 Msg->pCurrRelay->User, '\0',
 235                                 Msg->pCurrRelay->Pass);
 236
 237                         CtdlEncodeBase64(encoded, buf,
 238                                          strlen(Msg->pCurrRelay->User) * 2 +
 239                                          strlen(Msg->pCurrRelay->Pass) + 2, 0);
 240
 241                         StrBufPrintf(Msg->IO.SendBuf.Buf,
 242                                      "AUTH PLAIN %s\r\n",
 243                                      encoded);
 244                 }
 245         }
 246         SMTP_DBG_SEND();
 247         return eReadMessage;
 248 }
 249
 250
 251 eNextState SMTPC_read_auth_reply(SmtpOutMsg *Msg)
 252 {
 253         AsyncIO *IO = &Msg->IO;
 254         /* Do an AUTH command if necessary */
 255
 256         SMTP_DBG_READ();
 257
 258         if (Msg->SendLogin)
 259         {
 260                 if (!SMTP_IS_STATE('3'))
 261                         SMTP_VERROR(5);
 262         }
 263         else
 264         {
 265                 if (!SMTP_IS_STATE('2')) {
 266                         if (SMTP_IS_STATE('4'))
 267                                 SMTP_VERROR(4);
 268                         else
 269                                 SMTP_VERROR(5);
 270                 }
 271                 READ_NEXT_STATE(eFROM);
 272         }
 273         return eSendReply;
 274 }
 275
 276
 277 eNextState SMTPC_send_authplain_1(SmtpOutMsg *Msg)
 278 {
 279         AsyncIO *IO = &Msg->IO;
 280         char buf[SIZ];
 281         char encoded[1024];
 282         long encodedlen;
 283
 284         sprintf(buf, "%s",
 285                 Msg->pCurrRelay->User);
 286
 287         encodedlen = CtdlEncodeBase64(
 288                 encoded,
 289                 Msg->pCurrRelay->User,
 290                 strlen(Msg->pCurrRelay->User),
 291                 0);
 292
 293         StrBufPlain(Msg->IO.SendBuf.Buf,
 294                     encoded,
 295                     encodedlen);
 296
 297         StrBufAppendBufPlain(Msg->IO.SendBuf.Buf,
 298                              HKEY("\r\n"), 0);
 299
 300         SMTP_DBG_SEND();
 301
 302         return eReadMessage;
 303 }
 304 eNextState SMTPC_read_auth_plain_reply_1(SmtpOutMsg *Msg)
 305 {
 306         AsyncIO *IO = &Msg->IO;
 307         /* Do an AUTH command if necessary */
 308
 309         SMTP_DBG_READ();
 310
 311         if (!SMTP_IS_STATE('3'))
 312                 SMTP_VERROR(5);
 313         return eSendReply;
 314 }
 315
 316
 317 eNextState SMTPC_send_authplain_2(SmtpOutMsg *Msg)
 318 {
 319         AsyncIO *IO = &Msg->IO;
 320         char buf[SIZ];
 321         char encoded[1024];
 322         long encodedlen;
 323
 324         sprintf(buf, "%s",
 325                 Msg->pCurrRelay->Pass);
 326
 327         encodedlen = CtdlEncodeBase64(
 328                 encoded,
 329                 Msg->pCurrRelay->Pass,
 330                 strlen(Msg->pCurrRelay->Pass),
 331                 0);
 332
 333         StrBufPlain(Msg->IO.SendBuf.Buf,
 334                     encoded,
 335                     encodedlen);
 336
 337         StrBufAppendBufPlain(Msg->IO.SendBuf.Buf,
 338                              HKEY("\r\n"), 0);
 339
 340         SMTP_DBG_SEND();
 341
 342         return eReadMessage;
 343 }
 344 eNextState SMTPC_read_auth_plain_reply_2(SmtpOutMsg *Msg)
 345 {
 346         AsyncIO *IO = &Msg->IO;
 347         /* Do an AUTH command if necessary */
 348
 349         SMTP_DBG_READ();
 350
 351         if (!SMTP_IS_STATE('2')) {
 352                 if (SMTP_IS_STATE('4'))
 353                         SMTP_VERROR(4);
 354                 else
 355                         SMTP_VERROR(5);
 356         }
 357         return eSendReply;
 358 }
 359
 360 eNextState SMTPC_send_FROM(SmtpOutMsg *Msg)
 361 {
 362         AsyncIO *IO = &Msg->IO;
 363         /* previous command succeeded, now try the MAIL FROM: command */
 364         StrBufPrintf(Msg->IO.SendBuf.Buf,
 365                      "MAIL FROM:<%s>\r\n",
 366                      Msg->envelope_from);
 367
 368         SMTP_DBG_SEND();
 369         return eReadMessage;
 370 }
 371
 372 eNextState SMTPC_read_FROM_reply(SmtpOutMsg *Msg)
 373 {
 374         AsyncIO *IO = &Msg->IO;
 375         SMTP_DBG_READ();
 376
 377         if (!SMTP_IS_STATE('2')) {
 378                 if (SMTP_IS_STATE('4'))
 379                         SMTP_VERROR(4);
 380                 else
 381                         SMTP_VERROR(5);
 382         }
 383         return eSendReply;
 384 }
 385
 386
 387 eNextState SMTPC_send_RCPT(SmtpOutMsg *Msg)
 388 {
 389         AsyncIO *IO = &Msg->IO;
 390         /* MAIL succeeded, now try the RCPT To: command */
 391         StrBufPrintf(Msg->IO.SendBuf.Buf,
 392                      "RCPT TO:<%s@%s>\r\n",
 393                      Msg->user,
 394                      Msg->node);
 395
 396         SMTP_DBG_SEND();
 397         return eReadMessage;
 398 }
 399
 400 eNextState SMTPC_read_RCPT_reply(SmtpOutMsg *Msg)
 401 {
 402         AsyncIO *IO = &Msg->IO;
 403         SMTP_DBG_READ();
 404
 405         if (!SMTP_IS_STATE('2')) {
 406                 if (SMTP_IS_STATE('4'))
 407                         SMTP_VERROR(4);
 408                 else
 409                         SMTP_VERROR(5);
 410         }
 411         return eSendReply;
 412 }
 413
 414 eNextState SMTPC_send_DATAcmd(SmtpOutMsg *Msg)
 415 {
 416         AsyncIO *IO = &Msg->IO;
 417         /* RCPT succeeded, now try the DATA command */
 418         StrBufPlain(Msg->IO.SendBuf.Buf,
 419                     HKEY("DATA\r\n"));
 420
 421         SMTP_DBG_SEND();
 422         return eReadMessage;
 423 }
 424
 425 eNextState SMTPC_read_DATAcmd_reply(SmtpOutMsg *Msg)
 426 {
 427         AsyncIO *IO = &Msg->IO;
 428         SMTP_DBG_READ();
 429
 430         if (!SMTP_IS_STATE('3')) {
 431                 SetSMTPState(IO, eSTMPfailOne);
 432                 if (SMTP_IS_STATE('4'))
 433                         SMTP_VERROR(3);
 434                 else
 435                         SMTP_VERROR(5);
 436         }
 437         SetSMTPState(IO, eSTMPsmtpdata);
 438         return eSendReply;
 439 }
 440
 441 eNextState SMTPC_send_data_body(SmtpOutMsg *Msg)
 442 {
 443         StrBuf *Buf;
 444         /* If we reach this point, the server is expecting data.*/
 445
 446         Buf = Msg->IO.SendBuf.Buf;
 447         Msg->IO.SendBuf.Buf = Msg->msgtext;
 448         Msg->msgtext = Buf;
 449         /*
 450          * sending the message itself doesn't use this state machine.
 451          * so we have to operate it here by ourselves.
 452          */
 453         Msg->State ++;
 454
 455         return eSendMore;
 456 }
 457
 458 eNextState SMTPC_send_terminate_data_body(SmtpOutMsg *Msg)
 459 {
 460         StrBuf *Buf;
 461
 462         Buf = Msg->IO.SendBuf.Buf;
 463         Msg->IO.SendBuf.Buf = Msg->msgtext;
 464         Msg->msgtext = Buf;
 465
 466         StrBufPlain(Msg->IO.SendBuf.Buf,
 467                     HKEY(".\r\n"));
 468
 469         return eReadMessage;
 470
 471 }
 472
 473 eNextState SMTPC_read_data_body_reply(SmtpOutMsg *Msg)
 474 {
 475         AsyncIO *IO = &Msg->IO;
 476         SMTP_DBG_READ();
 477
 478         if (!SMTP_IS_STATE('2')) {
 479                 if (SMTP_IS_STATE('4'))
 480                         SMTP_VERROR(4);
 481                 else
 482                         SMTP_VERROR(5);
 483         }
 484
 485         SetSMTPState(IO, eSTMPsmtpdone);
 486         /* We did it! */
 487         StrBufPlain(Msg->MyQEntry->StatusMessage,
 488                     &ChrPtr(Msg->IO.RecvBuf.Buf)[4],
 489                     StrLength(Msg->IO.RecvBuf.Buf) - 4);
 490         StrBufTrim(Msg->MyQEntry->StatusMessage);
 491         Msg->MyQEntry->Status = 2;
 492         return eSendReply;
 493 }
 494
 495 eNextState SMTPC_send_QUIT(SmtpOutMsg *Msg)
 496 {
 497         AsyncIO *IO = &Msg->IO;
 498         StrBufPlain(Msg->IO.SendBuf.Buf,
 499                     HKEY("QUIT\r\n"));
 500
 501         SMTP_DBG_SEND();
 502         return eReadMessage;
 503 }
 504
 505 eNextState SMTPC_read_QUIT_reply(SmtpOutMsg *Msg)
 506 {
 507         AsyncIO *IO = &Msg->IO;
 508         SMTP_DBG_READ();
 509
 510         EVS_syslog(LOG_DEBUG,
 511                    "delivery to <%s> @ <%s> (%s) succeeded\n",
 512                    Msg->user,
 513                    Msg->node,
 514                    Msg->name);
 515
 516         return eTerminateConnection;
 517 }
 518
 519 eNextState SMTPC_read_dummy(SmtpOutMsg *Msg)
 520 {
 521         return eSendReply;
 522 }
 523
 524 eNextState SMTPC_send_dummy(SmtpOutMsg *Msg)
 525 {
 526         return eReadMessage;
 527 }
 528
 529 /*****************************************************************************/
 530 /*                     SMTP CLIENT DISPATCHER                                */
 531 /*****************************************************************************/
 532 SMTPReadHandler ReadHandlers[eMaxSMTPC] = {
 533         SMTPC_read_greeting,
 534         SMTPC_read_EHLO_reply,
 535         SMTPC_read_HELO_reply,
 536         SMTPC_read_auth_reply,
 537         SMTPC_read_auth_plain_reply_1,
 538         SMTPC_read_auth_plain_reply_2,
 539         SMTPC_read_FROM_reply,
 540         SMTPC_read_RCPT_reply,
 541         SMTPC_read_DATAcmd_reply,
 542         SMTPC_read_dummy,
 543         SMTPC_read_data_body_reply,
 544         SMTPC_read_QUIT_reply
 545 };
 546 SMTPSendHandler SendHandlers[eMaxSMTPC] = {
 547         SMTPC_send_dummy, /* we don't send a greeting, the server does... */
 548         SMTPC_send_EHLO,
 549         STMPC_send_HELO,
 550         SMTPC_send_auth,
 551         SMTPC_send_authplain_1,
 552         SMTPC_send_authplain_2,
 553         SMTPC_send_FROM,
 554         SMTPC_send_RCPT,
 555         SMTPC_send_DATAcmd,
 556         SMTPC_send_data_body,
 557         SMTPC_send_terminate_data_body,
 558         SMTPC_send_QUIT
 559 };
 560
 561 const double SMTP_C_ConnTimeout = 300.; /* wail 1 minute for connections... */
 562
 563 const double SMTP_C_ReadTimeouts[eMaxSMTPC] = {
 564         300., /* Greeting... */
 565         30., /* EHLO */
 566         30., /* HELO */
 567         30., /* Auth */
 568         30., /* Auth */
 569         30., /* Auth */
 570         30., /* From */
 571         90., /* RCPT */
 572         30., /* DATA */
 573         90., /* DATABody */
 574         90., /* end of body... */
 575         30.  /* QUIT */
 576 };
 577 const double SMTP_C_SendTimeouts[eMaxSMTPC] = {
 578         90., /* Greeting... */
 579         30., /* EHLO */
 580         30., /* HELO */
 581         30., /* Auth */
 582         30., /* Auth */
 583         30., /* Auth */
 584         30., /* From */
 585         30., /* RCPT */
 586         30., /* DATA */
 587         90., /* DATABody */
 588         900., /* end of body... */
 589         30.  /* QUIT */
 590 };
 591
 592 const ConstStr ReadErrors[eMaxSMTPC + 1] = {
 593         {HKEY("Connection broken during SMTP conversation")},
 594         {HKEY("Connection broken during SMTP EHLO")},
 595         {HKEY("Connection broken during SMTP HELO")},
 596         {HKEY("Connection broken during SMTP AUTH")},
 597         {HKEY("Connection broken during SMTP AUTH PLAIN I")},
 598         {HKEY("Connection broken during SMTP AUTH PLAIN II")},
 599         {HKEY("Connection broken during SMTP MAIL FROM")},
 600         {HKEY("Connection broken during SMTP RCPT")},
 601         {HKEY("Connection broken during SMTP DATA")},
 602         {HKEY("Connection broken during SMTP message transmit")},
 603         {HKEY("Connection broken during SMTP message transmit")},/* quit reply, don't care. */
 604         {HKEY("Connection broken during SMTP message transmit")},/* quit reply, don't care. */
 605         {HKEY("")}/* quit reply, don't care. */
 606 };
 607
 608
 609
 610
 611
 612 int smtp_resolve_recipients(SmtpOutMsg *Msg)
 613 {
 614         AsyncIO *IO = &Msg->IO;
 615         const char *ptr;
 616         char buf[1024];
 617         int scan_done;
 618         int lp, rp;
 619         int i;
 620
 621         EVNCS_syslog(LOG_DEBUG, "%s\n", __FUNCTION__);
 622
 623         if ((Msg==NULL) ||
 624             (Msg->MyQEntry == NULL) ||
 625             (StrLength(Msg->MyQEntry->Recipient) == 0)) {
 626                 return 0;
 627         }
 628
 629         /* Parse out the host portion of the recipient address */
 630         process_rfc822_addr(ChrPtr(Msg->MyQEntry->Recipient),
 631                             Msg->user,
 632                             Msg->node,
 633                             Msg->name);
 634
 635         EVNCS_syslog(LOG_DEBUG,
 636                      "Attempting delivery to <%s> @ <%s> (%s)\n",
 637                      Msg->user,
 638                      Msg->node,
 639                      Msg->name);
 640
 641         /* If no envelope_from is supplied, extract one from the message */
 642         Msg->envelope_from = ChrPtr(Msg->MyQItem->EnvelopeFrom);
 643         if ( (Msg->envelope_from == NULL) ||
 644              (IsEmptyStr(Msg->envelope_from)) ) {
 645                 Msg->mailfrom[0] = '\0';
 646                 scan_done = 0;
 647                 ptr = ChrPtr(Msg->msgtext);
 648                 do {
 649                         if (ptr = cmemreadline(ptr, buf, sizeof buf), *ptr == 0)
 650                         {
 651                                 scan_done = 1;
 652                         }
 653                         if (!strncasecmp(buf, "From:", 5))
 654                         {
 655                                 safestrncpy(Msg->mailfrom,
 656                                             &buf[5],
 657                                             sizeof Msg->mailfrom);
 658
 659                                 striplt(Msg->mailfrom);
 660                                 for (i=0; Msg->mailfrom[i]; ++i) {
 661                                         if (!isprint(Msg->mailfrom[i]))
 662                                         {
 663                                                 strcpy(&Msg->mailfrom[i],
 664                                                        &Msg->mailfrom[i+1]);
 665                                                 i=0;
 666                                         }
 667                                 }
 668
 669                                 /* Strip out parenthesized names */
 670                                 lp = (-1);
 671                                 rp = (-1);
 672                                 for (i=0;
 673                                      !IsEmptyStr(Msg->mailfrom + i);
 674                                      ++i)
 675                                 {
 676                                         if (Msg->mailfrom[i] == '(') lp = i;
 677                                         if (Msg->mailfrom[i] == ')') rp = i;
 678                                 }
 679                                 if ((lp>0)&&(rp>lp))
 680                                 {
 681                                         strcpy(&Msg->mailfrom[lp-1],
 682                                                &Msg->mailfrom[rp+1]);
 683                                 }
 684
 685                                 /* Prefer brokketized names */
 686                                 lp = (-1);
 687                                 rp = (-1);
 688                                 for (i=0;
 689                                      !IsEmptyStr(Msg->mailfrom + i);
 690                                      ++i)
 691                                 {
 692                                         if (Msg->mailfrom[i] == '<') lp = i;
 693                                         if (Msg->mailfrom[i] == '>') rp = i;
 694                                 }
 695                                 if ( (lp>=0) && (rp>lp) ) {
 696                                         Msg->mailfrom[rp] = 0;
 697                                         memmove(Msg->mailfrom,
 698                                                 &Msg->mailfrom[lp + 1],
 699                                                 rp - lp);
 700                                 }
 701
 702                                 scan_done = 1;
 703                         }
 704                 } while (scan_done == 0);
 705                 if (IsEmptyStr(Msg->mailfrom))
 706                         strcpy(Msg->mailfrom, "someone@somewhere.org");
 707
 708                 stripallbut(Msg->mailfrom, '<', '>');
 709                 Msg->envelope_from = Msg->mailfrom;
 710         }
 711
 712         return 1;
 713 }