citadel/modules/smtp/serv_smtpeventclient.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  * The VRFY and EXPN commands have been removed from this implementation
  21  * because nobody uses these commands anymore, except for spammers.
  22  *
  23  * Copyright (c) 1998-2012 by the citadel.org team
  24  *
  25  *  This program is open source software; you can redistribute it and/or modify
  26  *  it under the terms of the GNU General Public License version 3.
  27  *
  28  *
  29  *
  30  *  This program is distributed in the hope that it will be useful,
  31  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  32  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  33  *  GNU General Public License for more details.
  34  *
  35  *
  36  *
  37  *
  38  */
  39
  40 #include "sysdep.h"
  41 #include <stdlib.h>
  42 #include <unistd.h>
  43 #include <stdio.h>
  44 #include <termios.h>
  45 #include <fcntl.h>
  46 #include <signal.h>
  47 #include <pwd.h>
  48 #include <errno.h>
  49 #include <sys/types.h>
  50 #include <syslog.h>
  51
  52 #if TIME_WITH_SYS_TIME
  53 # include <sys/time.h>
  54 # include <time.h>
  55 #else
  56 # if HAVE_SYS_TIME_H
  57 #  include <sys/time.h>
  58 # else
  59 #  include <time.h>
  60 # endif
  61 #endif
  62 #include <sys/wait.h>
  63 #include <ctype.h>
  64 #include <string.h>
  65 #include <limits.h>
  66 #include <sys/socket.h>
  67 #include <netinet/in.h>
  68 #include <arpa/inet.h>
  69 #include <libcitadel.h>
  70 #include "citadel.h"
  71 #include "server.h"
  72 #include "citserver.h"
  73 #include "support.h"
  74 #include "config.h"
  75 #include "control.h"
  76 #include "user_ops.h"
  77 #include "database.h"
  78 #include "msgbase.h"
  79 #include "internet_addressing.h"
  80 #include "genstamp.h"
  81 #include "domain.h"
  82 #include "clientsocket.h"
  83 #include "locate_host.h"
  84 #include "citadel_dirs.h"
  85
  86 #include "ctdl_module.h"
  87
  88 #include "smtp_util.h"
  89 #include "event_client.h"
  90 #include "smtpqueue.h"
  91 #include "smtp_clienthandlers.h"
  92
  93 int SMTPClientDebugEnabled = 0;
  94 const unsigned short DefaultMXPort = 25;
  95 void DeleteSmtpOutMsg(void *v)
  96 {
  97         SmtpOutMsg *Msg = v;
  98         AsyncIO *IO = &Msg->IO;
  99         EVS_syslog(LOG_DEBUG, "%s Exit\n", __FUNCTION__);
 100
 101         /* these are kept in our own space and free'd below */
 102         Msg->IO.ConnectMe = NULL;
 103
 104         ares_free_data(Msg->AllMX);
 105         if (Msg->HostLookup.VParsedDNSReply != NULL)
 106                 Msg->HostLookup.DNSReplyFree(Msg->HostLookup.VParsedDNSReply);
 107         FreeURL(&Msg->Relay);
 108         FreeStrBuf(&Msg->msgtext);
 109         FreeAsyncIOContents(&Msg->IO);
 110         memset (Msg, 0, sizeof(SmtpOutMsg)); /* just to be shure... */
 111         free(Msg);
 112 }
 113
 114 eNextState SMTP_C_Shutdown(AsyncIO *IO);
 115 eNextState SMTP_C_Timeout(AsyncIO *IO);
 116 eNextState SMTP_C_ConnFail(AsyncIO *IO);
 117 eNextState SMTP_C_DispatchReadDone(AsyncIO *IO);
 118 eNextState SMTP_C_DispatchWriteDone(AsyncIO *IO);
 119 eNextState SMTP_C_DNSFail(AsyncIO *IO);
 120 eNextState SMTP_C_Terminate(AsyncIO *IO);
 121 eNextState SMTP_C_TerminateDB(AsyncIO *IO);
 122 eReadState SMTP_C_ReadServerStatus(AsyncIO *IO);
 123
 124 eNextState mx_connect_ip(AsyncIO *IO);
 125 eNextState get_one_mx_host_ip(AsyncIO *IO);
 126
 127 /******************************************************************************
 128  * So, we're finished with sending (regardless of success or failure)         *
 129  * This Message might be referenced by several Queue-Items, if we're the last,*
 130  * we need to free the memory and send bounce messages (on terminal failure)  *
 131  * else we just free our SMTP-Message struct.                                 *
 132  ******************************************************************************/
 133 eNextState FinalizeMessageSend_DB(AsyncIO *IO)
 134 {
 135         const char *Status;
 136         SmtpOutMsg *Msg = IO->Data;
 137
 138         if (Msg->MyQEntry->Status == 2)
 139                 Status = "Delivery successful.";
 140         else if (Msg->MyQEntry->Status == 5)
 141                 Status = "Delivery failed permanently; giving up.";
 142         else
 143                 Status = "Delivery failed temporarily; will retry later.";
 144
 145         EVS_syslog(LOG_INFO,
 146                    "%s Time[%fs] Recipient <%s> @ <%s> (%s) Status message: %s\n",
 147                    Status,
 148                    Msg->IO.Now - Msg->IO.StartIO,
 149                    Msg->user,
 150                    Msg->node,
 151                    Msg->name,
 152                    ChrPtr(Msg->MyQEntry->StatusMessage));
 153
 154
 155         Msg->IDestructQueItem = DecreaseQReference(Msg->MyQItem);
 156
 157         Msg->nRemain = CountActiveQueueEntries(Msg->MyQItem);
 158
 159         if (Msg->MyQEntry->Active &&
 160             CheckQEntryIsBounce(Msg->MyQEntry))
 161         {
 162                 /* are we casue for a bounce mail? */
 163                 Msg->MyQItem->SendBounceMail |= (1<<Msg->MyQEntry->Status);
 164         }
 165
 166         if ((Msg->nRemain > 0) || Msg->IDestructQueItem)
 167                 Msg->QMsgData = SerializeQueueItem(Msg->MyQItem);
 168         else
 169                 Msg->QMsgData = NULL;
 170
 171         /*
 172          * Uncompleted delivery instructions remain, so delete the old
 173          * instructions and replace with the updated ones.
 174          */
 175         EVS_syslog(LOG_DEBUG, "%ld", Msg->MyQItem->QueMsgID);
 176         CtdlDeleteMessages(SMTP_SPOOLOUT_ROOM, &Msg->MyQItem->QueMsgID, 1, "");
 177         Msg->MyQItem->QueMsgID = -1;
 178
 179         if (Msg->IDestructQueItem)
 180                 smtpq_do_bounce(Msg->MyQItem, Msg->msgtext);
 181
 182         if (Msg->nRemain > 0)
 183         {
 184                 struct CtdlMessage *msg;
 185                 msg = malloc(sizeof(struct CtdlMessage));
 186                 memset(msg, 0, sizeof(struct CtdlMessage));
 187                 msg->cm_magic = CTDLMESSAGE_MAGIC;
 188                 msg->cm_anon_type = MES_NORMAL;
 189                 msg->cm_format_type = FMT_RFC822;
 190                 msg->cm_fields['M'] = SmashStrBuf(&Msg->QMsgData);
 191                 msg->cm_fields['U'] = strdup("QMSG");
 192                 Msg->MyQItem->QueMsgID =
 193                         CtdlSubmitMsg(msg, NULL, SMTP_SPOOLOUT_ROOM, QP_EADDR);
 194                 EVS_syslog(LOG_DEBUG, "%ld", Msg->MyQItem->QueMsgID);
 195                 CtdlFreeMessage(msg);
 196         }
 197         else {
 198                 CtdlDeleteMessages(SMTP_SPOOLOUT_ROOM,
 199                                    &Msg->MyQItem->MessageID,
 200                                    1,
 201                                    "");
 202                 FreeStrBuf(&Msg->QMsgData);
 203         }
 204
 205         RemoveContext(Msg->IO.CitContext);
 206         return eAbort;
 207 }
 208
 209 eNextState Terminate(AsyncIO *IO)
 210 {
 211         SmtpOutMsg *Msg = IO->Data;
 212
 213         if (Msg->IDestructQueItem)
 214                 RemoveQItem(Msg->MyQItem);
 215
 216         DeleteSmtpOutMsg(Msg);
 217         return eAbort;
 218 }
 219 eNextState FinalizeMessageSend(SmtpOutMsg *Msg)
 220 {
 221         /* hand over to DB Queue */
 222         return QueueDBOperation(&Msg->IO, FinalizeMessageSend_DB);
 223 }
 224
 225 eNextState FailOneAttempt(AsyncIO *IO)
 226 {
 227         SmtpOutMsg *Msg = IO->Data;
 228
 229         if (Msg->MyQEntry->Status == 2)
 230                 return eAbort;
 231
 232         /*
 233          * possible ways here:
 234          * - connection timeout
 235          * - dns lookup failed
 236          */
 237         StopClientWatchers(IO);
 238
 239         if (Msg->pCurrRelay != NULL)
 240                 Msg->pCurrRelay = Msg->pCurrRelay->Next;
 241
 242         if (Msg->pCurrRelay == NULL) {
 243                 EVS_syslog(LOG_DEBUG, "%s Aborting\n", __FUNCTION__);
 244                 return eAbort;
 245         }
 246         if (Msg->pCurrRelay->IsIP) {
 247                 EVS_syslog(LOG_DEBUG, "%s connecting IP\n", __FUNCTION__);
 248                 return mx_connect_ip(IO);
 249         }
 250         else {
 251                 EVS_syslog(LOG_DEBUG,
 252                            "%s resolving next MX Record\n",
 253                            __FUNCTION__);
 254                 return get_one_mx_host_ip(IO);
 255         }
 256 }
 257
 258
 259 void SetConnectStatus(AsyncIO *IO)
 260 {
 261         SmtpOutMsg *Msg = IO->Data;
 262         char buf[256];
 263         void *src;
 264
 265         buf[0] = '\0';
 266
 267         if (IO->ConnectMe->IPv6) {
 268                 src = &IO->ConnectMe->Addr.sin6_addr;
 269         }
 270         else {
 271                 struct sockaddr_in *addr;
 272
 273                 addr = (struct sockaddr_in *)&IO->ConnectMe->Addr;
 274                 src = &addr->sin_addr.s_addr;
 275         }
 276
 277         inet_ntop((IO->ConnectMe->IPv6)?AF_INET6:AF_INET,
 278                   src,
 279                   buf,
 280                   sizeof(buf));
 281
 282         if (Msg->mx_host == NULL)
 283                 Msg->mx_host = "<no MX-Record>";
 284
 285         EVS_syslog(LOG_INFO,
 286                   "connecting to %s [%s]:%d ...\n",
 287                   Msg->mx_host,
 288                   buf,
 289                   Msg->IO.ConnectMe->Port);
 290
 291         Msg->MyQEntry->Status = 4;
 292         StrBufPrintf(Msg->MyQEntry->StatusMessage,
 293                      "Timeout while connecting %s [%s]:%d ",
 294                      Msg->mx_host,
 295                      buf,
 296                      Msg->IO.ConnectMe->Port);
 297         Msg->IO.NextState = eConnect;
 298 }
 299
 300 /*****************************************************************************
 301  * So we connect our Relay IP here.                                          *
 302  *****************************************************************************/
 303 eNextState mx_connect_ip(AsyncIO *IO)
 304 {
 305         SmtpOutMsg *Msg = IO->Data;
 306
 307         EVS_syslog(LOG_DEBUG, "%s\n", __FUNCTION__);
 308
 309         IO->ConnectMe = Msg->pCurrRelay;
 310         Msg->State = eConnectMX;
 311
 312         SetConnectStatus(IO);
 313
 314         return EvConnectSock(IO,
 315                              SMTP_C_ConnTimeout,
 316                              SMTP_C_ReadTimeouts[0],
 317                              1);
 318 }
 319
 320 eNextState get_one_mx_host_ip_done(AsyncIO *IO)
 321 {
 322         SmtpOutMsg *Msg = IO->Data;
 323         struct hostent *hostent;
 324
 325         QueryCbDone(IO);
 326         EVS_syslog(LOG_DEBUG, "%s Time[%fs]\n",
 327                    __FUNCTION__,
 328                    IO->Now - IO->DNS.Start);
 329
 330         hostent = Msg->HostLookup.VParsedDNSReply;
 331         if ((Msg->HostLookup.DNSStatus == ARES_SUCCESS) &&
 332             (hostent != NULL) ) {
 333                 memset(&Msg->pCurrRelay->Addr, 0, sizeof(struct in6_addr));
 334                 if (Msg->pCurrRelay->IPv6) {
 335                         memcpy(&Msg->pCurrRelay->Addr.sin6_addr.s6_addr,
 336                                &hostent->h_addr_list[0],
 337                                sizeof(struct in6_addr));
 338
 339                         Msg->pCurrRelay->Addr.sin6_family =
 340                                 hostent->h_addrtype;
 341                         Msg->pCurrRelay->Addr.sin6_port =
 342                                 htons(DefaultMXPort);
 343                 }
 344                 else {
 345                         struct sockaddr_in *addr;
 346                         /*
 347                          * Bypass the ns lookup result like this:
 348                          * IO->Addr.sin_addr.s_addr = inet_addr("127.0.0.1");
 349                          * addr->sin_addr.s_addr =
 350                          *   htonl((uint32_t)&hostent->h_addr_list[0]);
 351                          */
 352
 353                         addr = (struct sockaddr_in*) &Msg->pCurrRelay->Addr;
 354
 355                         memcpy(&addr->sin_addr.s_addr,
 356                                hostent->h_addr_list[0],
 357                                sizeof(uint32_t));
 358
 359                         addr->sin_family = hostent->h_addrtype;
 360                         addr->sin_port   = htons(DefaultMXPort);
 361                 }
 362                 Msg->mx_host = Msg->pCurrRelay->Host;
 363                 if (Msg->HostLookup.VParsedDNSReply != NULL) {
 364                         Msg->HostLookup.DNSReplyFree(Msg->HostLookup.VParsedDNSReply);
 365                         Msg->HostLookup.VParsedDNSReply = NULL;
 366                 }
 367                 return mx_connect_ip(IO);
 368         }
 369         else {
 370                 if (Msg->HostLookup.VParsedDNSReply != NULL) {
 371                         Msg->HostLookup.DNSReplyFree(Msg->HostLookup.VParsedDNSReply);
 372                         Msg->HostLookup.VParsedDNSReply = NULL;
 373                 }
 374                 return FailOneAttempt(IO);
 375         }
 376 }
 377
 378 eNextState get_one_mx_host_ip(AsyncIO *IO)
 379 {
 380         SmtpOutMsg * Msg = IO->Data;
 381         /*
 382          * here we start with the lookup of one host. it might be...
 383          * - the relay host *sigh*
 384          * - the direct hostname if there was no mx record
 385          * - one of the mx'es
 386          */
 387
 388         EVS_syslog(LOG_DEBUG, "%s\n", __FUNCTION__);
 389
 390         EVS_syslog(LOG_DEBUG,
 391                   "looking up %s-Record %s : %d ...\n",
 392                   (Msg->pCurrRelay->IPv6)? "aaaa": "a",
 393                   Msg->pCurrRelay->Host,
 394                   Msg->pCurrRelay->Port);
 395
 396         if (!QueueQuery((Msg->pCurrRelay->IPv6)? ns_t_aaaa : ns_t_a,
 397                         Msg->pCurrRelay->Host,
 398                         &Msg->IO,
 399                         &Msg->HostLookup,
 400                         get_one_mx_host_ip_done))
 401         {
 402                 Msg->MyQEntry->Status = 5;
 403                 StrBufPrintf(Msg->MyQEntry->StatusMessage,
 404                              "No MX hosts found for <%s>", Msg->node);
 405                 Msg->IO.NextState = eTerminateConnection;
 406                 return IO->NextState;
 407         }
 408         IO->NextState = eReadDNSReply;
 409         return IO->NextState;
 410 }
 411
 412
 413 /*****************************************************************************
 414  * here we try to find out about the MX records for our recipients.          *
 415  *****************************************************************************/
 416 eNextState smtp_resolve_mx_record_done(AsyncIO *IO)
 417 {
 418         SmtpOutMsg * Msg = IO->Data;
 419         ParsedURL **pp;
 420
 421         QueryCbDone(IO);
 422
 423         EVS_syslog(LOG_DEBUG, "%s Time[%fs]\n",
 424                    __FUNCTION__,
 425                    IO->Now - IO->DNS.Start);
 426
 427         pp = &Msg->Relay;
 428         while ((pp != NULL) && (*pp != NULL) && ((*pp)->Next != NULL))
 429                 pp = &(*pp)->Next;
 430
 431         if ((IO->DNS.Query->DNSStatus == ARES_SUCCESS) &&
 432             (IO->DNS.Query->VParsedDNSReply != NULL))
 433         { /* ok, we found mx records. */
 434
 435                 Msg->CurrMX
 436                         = Msg->AllMX
 437                         = IO->DNS.Query->VParsedDNSReply;
 438                 while (Msg->CurrMX) {
 439                         int i;
 440                         for (i = 0; i < 2; i++) {
 441                                 ParsedURL *p;
 442
 443                                 p = (ParsedURL*) malloc(sizeof(ParsedURL));
 444                                 memset(p, 0, sizeof(ParsedURL));
 445                                 p->Priority = Msg->CurrMX->priority;
 446                                 p->IsIP = 0;
 447                                 p->Port = DefaultMXPort;
 448                                 p->IPv6 = i == 1;
 449                                 p->Host = Msg->CurrMX->host;
 450                                 if (*pp == NULL)
 451                                         *pp = p;
 452                                 else {
 453                                         ParsedURL *ppp = *pp;
 454
 455                                         while ((ppp->Next != NULL) &&
 456                                                (ppp->Next->Priority <= p->Priority))
 457                                                ppp = ppp->Next;
 458                                         if ((ppp == *pp) &&
 459                                             (ppp->Priority > p->Priority)) {
 460                                                 p->Next = *pp;
 461                                                 *pp = p;
 462                                         }
 463                                         else {
 464                                                 p->Next = ppp->Next;
 465                                                 ppp->Next = p;
 466                                         }
 467                                 }
 468                         }
 469                         Msg->CurrMX    = Msg->CurrMX->next;
 470                 }
 471                 Msg->CXFlags   = Msg->CXFlags & F_HAVE_MX;
 472         }
 473         else { /* else fall back to the plain hostname */
 474                 int i;
 475                 for (i = 0; i < 2; i++) {
 476                         ParsedURL *p;
 477
 478                         p = (ParsedURL*) malloc(sizeof(ParsedURL));
 479                         memset(p, 0, sizeof(ParsedURL));
 480                         p->IsIP = 0;
 481                         p->Port = DefaultMXPort;
 482                         p->IPv6 = i == 1;
 483                         p->Host = Msg->node;
 484
 485                         *pp = p;
 486                         pp = &p->Next;
 487                 }
 488                 Msg->CXFlags   = Msg->CXFlags & F_DIRECT;
 489         }
 490         if (Msg->MyQItem->FallBackHost != NULL)
 491         {
 492                 Msg->MyQItem->FallBackHost->Next = *pp;
 493                 *pp = Msg->MyQItem->FallBackHost;
 494         }
 495         Msg->pCurrRelay = Msg->Relay;
 496         return get_one_mx_host_ip(IO);
 497 }
 498
 499 eNextState resolve_mx_records(AsyncIO *IO)
 500 {
 501         SmtpOutMsg * Msg = IO->Data;
 502
 503         EVS_syslog(LOG_DEBUG, "%s\n", __FUNCTION__);
 504         /* start resolving MX records here. */
 505         if (!QueueQuery(ns_t_mx,
 506                         Msg->node,
 507                         &Msg->IO,
 508                         &Msg->MxLookup,
 509                         smtp_resolve_mx_record_done))
 510         {
 511                 Msg->MyQEntry->Status = 5;
 512                 StrBufPrintf(Msg->MyQEntry->StatusMessage,
 513                              "No MX hosts found for <%s>", Msg->node);
 514                 return IO->NextState;
 515         }
 516         Msg->IO.NextState = eReadDNSReply;
 517         return IO->NextState;
 518 }
 519
 520
 521
 522 /******************************************************************************
 523  *  so, we're going to start a SMTP delivery.  lets get it on.                *
 524  ******************************************************************************/
 525
 526 SmtpOutMsg *new_smtp_outmsg(OneQueItem *MyQItem,
 527                             MailQEntry *MyQEntry,
 528                             int MsgCount)
 529 {
 530         SmtpOutMsg * Msg;
 531
 532         Msg = (SmtpOutMsg *) malloc(sizeof(SmtpOutMsg));
 533         if (Msg == NULL)
 534                 return NULL;
 535         memset(Msg, 0, sizeof(SmtpOutMsg));
 536
 537         Msg->n                = MsgCount;
 538         Msg->MyQEntry         = MyQEntry;
 539         Msg->MyQItem          = MyQItem;
 540         Msg->pCurrRelay       = MyQItem->URL;
 541
 542         InitIOStruct(&Msg->IO,
 543                      Msg,
 544                      eReadMessage,
 545                      SMTP_C_ReadServerStatus,
 546                      SMTP_C_DNSFail,
 547                      SMTP_C_DispatchWriteDone,
 548                      SMTP_C_DispatchReadDone,
 549                      SMTP_C_Terminate,
 550                      SMTP_C_TerminateDB,
 551                      SMTP_C_ConnFail,
 552                      SMTP_C_Timeout,
 553                      SMTP_C_Shutdown);
 554
 555         Msg->IO.ErrMsg = Msg->MyQEntry->StatusMessage;
 556
 557         return Msg;
 558 }
 559
 560 void smtp_try_one_queue_entry(OneQueItem *MyQItem,
 561                               MailQEntry *MyQEntry,
 562                               StrBuf *MsgText,
 563                         /*KeepMsgText allows us to use MsgText as ours.*/
 564                               int KeepMsgText,
 565                               int MsgCount)
 566 {
 567         SmtpOutMsg *Msg;
 568
 569         SMTPC_syslog(LOG_DEBUG, "%s\n", __FUNCTION__);
 570
 571         Msg = new_smtp_outmsg(MyQItem, MyQEntry, MsgCount);
 572         if (Msg == NULL) {
 573                 SMTPC_syslog(LOG_DEBUG, "%s Failed to alocate message context.\n", __FUNCTION__);
 574                 if (KeepMsgText)
 575                         FreeStrBuf (&MsgText);
 576                 return;
 577         }
 578         if (KeepMsgText) Msg->msgtext = MsgText;
 579         else             Msg->msgtext = NewStrBufDup(MsgText);
 580
 581         if (smtp_resolve_recipients(Msg)) {
 582
 583                 safestrncpy(
 584                         ((CitContext *)Msg->IO.CitContext)->cs_host,
 585                         Msg->node,
 586                         sizeof(((CitContext *)
 587                                 Msg->IO.CitContext)->cs_host));
 588
 589                 SMTPC_syslog(LOG_DEBUG, "Starting: [%ld] <%s> CC <%d> \n",
 590                              Msg->MyQItem->MessageID,
 591                              ChrPtr(Msg->MyQEntry->Recipient),
 592                              ((CitContext*)Msg->IO.CitContext)->cs_pid);
 593                 if (Msg->pCurrRelay == NULL)
 594                         QueueEventContext(&Msg->IO,
 595                                           resolve_mx_records);
 596                 else { /* oh... via relay host */
 597                         if (Msg->pCurrRelay->IsIP) {
 598                                 QueueEventContext(&Msg->IO,
 599                                                   mx_connect_ip);
 600                         }
 601                         else {
 602                                 /* uneducated admin has chosen to
 603                                    add DNS to the equation... */
 604                                 QueueEventContext(&Msg->IO,
 605                                                   get_one_mx_host_ip);
 606                         }
 607                 }
 608         }
 609         else {
 610                 /* No recipients? well fail then. */
 611                 if (Msg->MyQEntry == NULL) {
 612                         Msg->MyQEntry->Status = 5;
 613                         StrBufPlain(Msg->MyQEntry->StatusMessage,
 614                                     HKEY("Invalid Recipient!"));
 615                 }
 616                 FinalizeMessageSend_DB(&Msg->IO);
 617                 DeleteSmtpOutMsg(&Msg->IO);
 618         }
 619 }
 620
 621
 622
 623
 624
 625
 626 /*****************************************************************************/
 627 /*                     SMTP CLIENT DISPATCHER                                */
 628 /*****************************************************************************/
 629
 630 void SMTPSetTimeout(eNextState NextTCPState, SmtpOutMsg *Msg)
 631 {
 632         double Timeout = 0.0;
 633         AsyncIO *IO = &Msg->IO;
 634
 635         EVS_syslog(LOG_DEBUG, "%s\n", __FUNCTION__);
 636
 637         switch (NextTCPState) {
 638         case eSendFile:
 639         case eSendReply:
 640         case eSendMore:
 641                 Timeout = SMTP_C_SendTimeouts[Msg->State];
 642                 if (Msg->State == eDATABody) {
 643                         /* if we're sending a huge message,
 644                          * we need more time.
 645                          */
 646                         Timeout += StrLength(Msg->msgtext) / 512;
 647                 }
 648                 break;
 649         case eReadMessage:
 650                 Timeout = SMTP_C_ReadTimeouts[Msg->State];
 651                 if (Msg->State == eDATATerminateBody) {
 652                         /*
 653                          * some mailservers take a nap before accepting
 654                          * the message content inspection and such.
 655                          */
 656                         Timeout += StrLength(Msg->msgtext) / 512;
 657                 }
 658                 break;
 659         case eSendDNSQuery:
 660         case eReadDNSReply:
 661         case eDBQuery:
 662         case eReadFile:
 663         case eReadMore:
 664         case eReadPayload:
 665         case eConnect:
 666         case eTerminateConnection:
 667         case eAbort:
 668                 return;
 669         }
 670         SetNextTimeout(&Msg->IO, Timeout);
 671 }
 672 eNextState SMTP_C_DispatchReadDone(AsyncIO *IO)
 673 {
 674         EVS_syslog(LOG_DEBUG, "%s\n", __FUNCTION__);
 675         SmtpOutMsg *Msg = IO->Data;
 676         eNextState rc;
 677
 678         rc = ReadHandlers[Msg->State](Msg);
 679         if (rc != eAbort)
 680         {
 681                 Msg->State++;
 682                 SMTPSetTimeout(rc, Msg);
 683         }
 684         return rc;
 685 }
 686 eNextState SMTP_C_DispatchWriteDone(AsyncIO *IO)
 687 {
 688         EVS_syslog(LOG_DEBUG, "%s\n", __FUNCTION__);
 689         SmtpOutMsg *Msg = IO->Data;
 690         eNextState rc;
 691
 692         rc = SendHandlers[Msg->State](Msg);
 693         SMTPSetTimeout(rc, Msg);
 694         return rc;
 695 }
 696
 697
 698 /*****************************************************************************/
 699 /*                     SMTP CLIENT ERROR CATCHERS                            */
 700 /*****************************************************************************/
 701 eNextState SMTP_C_Terminate(AsyncIO *IO)
 702 {
 703         SmtpOutMsg *Msg = IO->Data;
 704
 705         EVS_syslog(LOG_DEBUG, "%s\n", __FUNCTION__);
 706         return FinalizeMessageSend(Msg);
 707 }
 708 eNextState SMTP_C_TerminateDB(AsyncIO *IO)
 709 {
 710         EVS_syslog(LOG_DEBUG, "%s\n", __FUNCTION__);
 711         return Terminate(IO);
 712 }
 713 eNextState SMTP_C_Timeout(AsyncIO *IO)
 714 {
 715         SmtpOutMsg *Msg = IO->Data;
 716
 717         Msg->MyQEntry->Status = 4;
 718         EVS_syslog(LOG_DEBUG, "%s\n", __FUNCTION__);
 719         StrBufPlain(IO->ErrMsg, CKEY(ReadErrors[Msg->State]));
 720         if (Msg->State > eRCPT)
 721                 return eAbort;
 722         else
 723                 return FailOneAttempt(IO);
 724 }
 725 eNextState SMTP_C_ConnFail(AsyncIO *IO)
 726 {
 727         SmtpOutMsg *Msg = IO->Data;
 728
 729         Msg->MyQEntry->Status = 4;
 730         EVS_syslog(LOG_DEBUG, "%s\n", __FUNCTION__);
 731         StrBufPlain(IO->ErrMsg, CKEY(ReadErrors[Msg->State]));
 732         return FailOneAttempt(IO);
 733 }
 734 eNextState SMTP_C_DNSFail(AsyncIO *IO)
 735 {
 736         SmtpOutMsg *Msg = IO->Data;
 737         Msg->MyQEntry->Status = 4;
 738         EVS_syslog(LOG_DEBUG, "%s\n", __FUNCTION__);
 739         return FailOneAttempt(IO);
 740 }
 741 eNextState SMTP_C_Shutdown(AsyncIO *IO)
 742 {
 743         EVS_syslog(LOG_DEBUG, "%s\n", __FUNCTION__);
 744         SmtpOutMsg *Msg = IO->Data;
 745
 746         Msg->MyQEntry->Status = 3;
 747         StrBufPlain(Msg->MyQEntry->StatusMessage,
 748                     HKEY("server shutdown during message submit."));
 749         return FinalizeMessageSend(Msg);
 750 }
 751
 752
 753 /**
 754  * @brief lineread Handler;
 755  * understands when to read more SMTP lines, and when this is a one-lined reply.
 756  */
 757 eReadState SMTP_C_ReadServerStatus(AsyncIO *IO)
 758 {
 759         eReadState Finished = eBufferNotEmpty;
 760
 761         while (Finished == eBufferNotEmpty) {
 762                 Finished = StrBufChunkSipLine(IO->IOBuf, &IO->RecvBuf);
 763
 764                 switch (Finished) {
 765                 case eMustReadMore: /// read new from socket...
 766                         return Finished;
 767                         break;
 768                 case eBufferNotEmpty: /* shouldn't happen... */
 769                 case eReadSuccess: /// done for now...
 770                         if (StrLength(IO->IOBuf) < 4)
 771                                 continue;
 772                         if (ChrPtr(IO->IOBuf)[3] == '-')
 773                                 Finished = eBufferNotEmpty;
 774                         else
 775                                 return Finished;
 776                         break;
 777                 case eReadFail: /// WHUT?
 778                         ///todo: shut down!
 779                         break;
 780                 }
 781         }
 782         return Finished;
 783 }
 784
 785 void LogDebugEnableSMTPClient(const int n)
 786 {
 787         SMTPClientDebugEnabled = n;
 788 }
 789
 790 CTDL_MODULE_INIT(smtp_eventclient)
 791 {
 792         if (!threading)
 793                 CtdlRegisterDebugFlagHook(HKEY("smtpeventclient"), LogDebugEnableSMTPClient, &SMTPClientDebugEnabled);
 794         return "smtpeventclient";
 795 }