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 const unsigned short DefaultMXPort = 25;
  94 void DeleteSmtpOutMsg(void *v)
  95 {
  96         SmtpOutMsg *Msg = v;
  97         AsyncIO *IO = &Msg->IO;
  98         EV_syslog(LOG_DEBUG, "SMTP: %s Aborting\n", __FUNCTION__);
  99
 100         /* these are kept in our own space and free'd below */
 101         Msg->IO.ConnectMe = NULL;
 102
 103         ares_free_data(Msg->AllMX);
 104         if (Msg->HostLookup.VParsedDNSReply != NULL)
 105                 Msg->HostLookup.DNSReplyFree(Msg->HostLookup.VParsedDNSReply);
 106         FreeURL(&Msg->Relay);
 107         FreeStrBuf(&Msg->msgtext);
 108         FreeAsyncIOContents(&Msg->IO);
 109         memset (Msg, 0, sizeof(SmtpOutMsg)); /* just to be shure... */
 110         free(Msg);
 111 }
 112
 113 eNextState SMTP_C_Shutdown(AsyncIO *IO);
 114 eNextState SMTP_C_Timeout(AsyncIO *IO);
 115 eNextState SMTP_C_ConnFail(AsyncIO *IO);
 116 eNextState SMTP_C_DispatchReadDone(AsyncIO *IO);
 117 eNextState SMTP_C_DispatchWriteDone(AsyncIO *IO);
 118 eNextState SMTP_C_DNSFail(AsyncIO *IO);
 119 eNextState SMTP_C_Terminate(AsyncIO *IO);
 120 eNextState SMTP_C_TerminateDB(AsyncIO *IO);
 121 eReadState SMTP_C_ReadServerStatus(AsyncIO *IO);
 122
 123 eNextState mx_connect_ip(AsyncIO *IO);
 124 eNextState get_one_mx_host_ip(AsyncIO *IO);
 125 eNextState FinalizeMessageSendDB(AsyncIO *IO);
 126 eNextState FinalizeMessageSend_DB1(AsyncIO *IO);
 127 eNextState FinalizeMessageSend_DB2(AsyncIO *IO);
 128 eNextState FinalizeMessageSend_DB3(AsyncIO *IO);
 129 eNextState FinalizeMessageSend_DB4(AsyncIO *IO);
 130
 131 /******************************************************************************
 132  * So, we're finished with sending (regardless of success or failure)         *
 133  * This Message might be referenced by several Queue-Items, if we're the last,*
 134  * we need to free the memory and send bounce messages (on terminal failure)  *
 135  * else we just free our SMTP-Message struct.                                 *
 136  ******************************************************************************/
 137 inline void FinalizeMessageSend_1(AsyncIO *IO)
 138 {
 139         SmtpOutMsg *Msg = IO->Data;
 140         Msg->IDestructQueItem = DecreaseQReference(Msg->MyQItem);
 141
 142         Msg->nRemain = CountActiveQueueEntries(Msg->MyQItem);
 143
 144         if (Msg->MyQEntry->Active &&
 145             CheckQEntryIsBounce(Msg->MyQEntry))
 146         {
 147                 /* are we casue for a bounce mail? */
 148                 Msg->MyQItem->SendBounceMail |= (1<<Msg->MyQEntry->Status);
 149         }
 150
 151         if ((Msg->nRemain > 0) || Msg->IDestructQueItem)
 152                 Msg->QMsgData = SerializeQueueItem(Msg->MyQItem);
 153         else
 154                 Msg->QMsgData = NULL;
 155 }
 156 eNextState FinalizeMessageSend(SmtpOutMsg *Msg)
 157 {
 158         return QueueDBOperation(&Msg->IO, FinalizeMessageSend_DB1);
 159 }
 160
 161 inline void FinalizeMessageSend_DB_1(AsyncIO *IO)
 162 {
 163         SmtpOutMsg *Msg = IO->Data;
 164
 165         /*
 166          * Uncompleted delivery instructions remain, so delete the old
 167          * instructions and replace with the updated ones.
 168          */
 169         EVS_syslog(LOG_DEBUG, "SMTPQD: %ld", Msg->MyQItem->QueMsgID);
 170         CtdlDeleteMessages(SMTP_SPOOLOUT_ROOM, &Msg->MyQItem->QueMsgID, 1, "");
 171 }
 172 eNextState FinalizeMessageSend_DB1(AsyncIO *IO)
 173 {
 174         FinalizeMessageSend_1(IO);
 175         FinalizeMessageSend_DB_1(IO);
 176         return NextDBOperation(IO, FinalizeMessageSend_DB2);
 177 }
 178
 179
 180 inline void FinalizeMessageSend_DB_2(AsyncIO *IO)
 181 {
 182         SmtpOutMsg *Msg = IO->Data;
 183
 184         if (Msg->IDestructQueItem)
 185                 smtpq_do_bounce(Msg->MyQItem, Msg->msgtext);
 186 }
 187 eNextState FinalizeMessageSend_DB2(AsyncIO *IO)
 188 {
 189         FinalizeMessageSend_DB_2(IO);
 190
 191         return NextDBOperation(IO, FinalizeMessageSend_DB3);
 192 }
 193
 194
 195 inline void FinalizeMessageSend_DB_3(AsyncIO *IO)
 196 {
 197         SmtpOutMsg *Msg = IO->Data;
 198
 199         if (Msg->nRemain > 0)
 200         {
 201                 struct CtdlMessage *msg;
 202                 msg = malloc(sizeof(struct CtdlMessage));
 203                 memset(msg, 0, sizeof(struct CtdlMessage));
 204                 msg->cm_magic = CTDLMESSAGE_MAGIC;
 205                 msg->cm_anon_type = MES_NORMAL;
 206                 msg->cm_format_type = FMT_RFC822;
 207                 msg->cm_fields['M'] = SmashStrBuf(&Msg->QMsgData);
 208                 msg->cm_fields['U'] = strdup("QMSG");
 209                 Msg->MyQItem->QueMsgID =
 210                         CtdlSubmitMsg(msg, NULL, SMTP_SPOOLOUT_ROOM, QP_EADDR);
 211                 EVS_syslog(LOG_DEBUG, "SMTPQ: %ld", Msg->MyQItem->QueMsgID);
 212                 CtdlFreeMessage(msg);
 213         }
 214         else {
 215                 CtdlDeleteMessages(SMTP_SPOOLOUT_ROOM,
 216                                    &Msg->MyQItem->MessageID,
 217                                    1,
 218                                    "");
 219                 FreeStrBuf(&Msg->QMsgData);
 220         }
 221         DecreaseShutdownDeliveries(Msg->MyQItem);
 222 }
 223 eNextState FinalizeMessageSend_DB3(AsyncIO *IO)
 224 {
 225         SmtpOutMsg *Msg = IO->Data;
 226         FinalizeMessageSend_DB_3(IO);
 227         if (!Msg->IDestructQueItem)
 228                 return eAbort;
 229         return NextDBOperation(IO, FinalizeMessageSend_DB4);
 230 }
 231
 232 eNextState FinalizeMessageSend_DB4(AsyncIO *IO)
 233 {
 234         int n;
 235         SmtpOutMsg *Msg = IO->Data;
 236
 237         n = GetShutdownDeliveries(Msg->MyQItem);
 238         if (n > 0)
 239                 return NextDBOperation(IO, FinalizeMessageSend_DB4);
 240         else
 241                 return eAbort;
 242 }
 243
 244 eNextState FinalizeMessageSend_DB(AsyncIO *IO)
 245 {
 246         SmtpOutMsg *Msg = IO->Data;
 247
 248         RemoveContext(Msg->IO.CitContext);
 249         if (Msg->IDestructQueItem)
 250                 RemoveQItem(Msg->MyQItem);
 251         DeleteSmtpOutMsg(Msg);
 252         return eAbort;
 253 }
 254
 255 eNextState FailOneAttempt(AsyncIO *IO)
 256 {
 257         SmtpOutMsg *Msg = IO->Data;
 258
 259         if (Msg->MyQEntry->Status == 2)
 260                 return eAbort;
 261
 262         /*
 263          * possible ways here:
 264          * - connection timeout
 265          * - dns lookup failed
 266          */
 267         StopClientWatchers(IO);
 268
 269         if (Msg->pCurrRelay != NULL)
 270                 Msg->pCurrRelay = Msg->pCurrRelay->Next;
 271
 272         if (Msg->pCurrRelay == NULL) {
 273                 EVS_syslog(LOG_DEBUG, "SMTP: %s Aborting\n", __FUNCTION__);
 274                 return eAbort;
 275         }
 276         if (Msg->pCurrRelay->IsIP) {
 277                 EVS_syslog(LOG_DEBUG, "SMTP: %s connecting IP\n", __FUNCTION__);
 278                 return mx_connect_ip(IO);
 279         }
 280         else {
 281                 EVS_syslog(LOG_DEBUG,
 282                            "SMTP: %s resolving next MX Record\n",
 283                            __FUNCTION__);
 284                 return get_one_mx_host_ip(IO);
 285         }
 286 }
 287
 288
 289 void SetConnectStatus(AsyncIO *IO)
 290 {
 291         SmtpOutMsg *Msg = IO->Data;
 292         char buf[256];
 293         void *src;
 294
 295         buf[0] = '\0';
 296
 297         if (IO->ConnectMe->IPv6) {
 298                 src = &IO->ConnectMe->Addr.sin6_addr;
 299         }
 300         else {
 301                 struct sockaddr_in *addr;
 302
 303                 addr = (struct sockaddr_in *)&IO->ConnectMe->Addr;
 304                 src = &addr->sin_addr.s_addr;
 305         }
 306
 307         inet_ntop((IO->ConnectMe->IPv6)?AF_INET6:AF_INET,
 308                   src,
 309                   buf,
 310                   sizeof(buf));
 311
 312         if (Msg->mx_host == NULL)
 313                 Msg->mx_host = "<no MX-Record>";
 314
 315         EVS_syslog(LOG_DEBUG,
 316                   "SMTP client[%ld]: connecting to %s [%s]:%d ...\n",
 317                   Msg->n,
 318                   Msg->mx_host,
 319                   buf,
 320                   Msg->IO.ConnectMe->Port);
 321
 322         Msg->MyQEntry->Status = 5;
 323         StrBufPrintf(Msg->MyQEntry->StatusMessage,
 324                      "Timeout while connecting %s [%s]:%d ",
 325                      Msg->mx_host,
 326                      buf,
 327                      Msg->IO.ConnectMe->Port);
 328         Msg->IO.NextState = eConnect;
 329 }
 330
 331 /*****************************************************************************
 332  * So we connect our Relay IP here.                                          *
 333  *****************************************************************************/
 334 eNextState mx_connect_ip(AsyncIO *IO)
 335 {
 336         SmtpOutMsg *Msg = IO->Data;
 337
 338         EVS_syslog(LOG_DEBUG, "SMTP: %s\n", __FUNCTION__);
 339
 340         IO->ConnectMe = Msg->pCurrRelay;
 341         Msg->State = eConnectMX;
 342
 343         SetConnectStatus(IO);
 344
 345         return EvConnectSock(IO,
 346                              SMTP_C_ConnTimeout,
 347                              SMTP_C_ReadTimeouts[0],
 348                              1);
 349 }
 350
 351 eNextState get_one_mx_host_ip_done(AsyncIO *IO)
 352 {
 353         SmtpOutMsg *Msg = IO->Data;
 354         struct hostent *hostent;
 355
 356         QueryCbDone(IO);
 357
 358         hostent = Msg->HostLookup.VParsedDNSReply;
 359         if ((Msg->HostLookup.DNSStatus == ARES_SUCCESS) &&
 360             (hostent != NULL) ) {
 361                 memset(&Msg->pCurrRelay->Addr, 0, sizeof(struct in6_addr));
 362                 if (Msg->pCurrRelay->IPv6) {
 363                         memcpy(&Msg->pCurrRelay->Addr.sin6_addr.s6_addr,
 364                                &hostent->h_addr_list[0],
 365                                sizeof(struct in6_addr));
 366
 367                         Msg->pCurrRelay->Addr.sin6_family =
 368                                 hostent->h_addrtype;
 369                         Msg->pCurrRelay->Addr.sin6_port =
 370                                 htons(DefaultMXPort);
 371                 }
 372                 else {
 373                         struct sockaddr_in *addr;
 374                         /*
 375                          * Bypass the ns lookup result like this:
 376                          * IO->Addr.sin_addr.s_addr = inet_addr("127.0.0.1");
 377                          * addr->sin_addr.s_addr =
 378                          *   htonl((uint32_t)&hostent->h_addr_list[0]);
 379                          */
 380
 381                         addr = (struct sockaddr_in*) &Msg->pCurrRelay->Addr;
 382
 383                         memcpy(&addr->sin_addr.s_addr,
 384                                hostent->h_addr_list[0],
 385                                sizeof(uint32_t));
 386
 387                         addr->sin_family = hostent->h_addrtype;
 388                         addr->sin_port   = htons(DefaultMXPort);
 389                 }
 390                 Msg->mx_host = Msg->pCurrRelay->Host;
 391                 return mx_connect_ip(IO);
 392         }
 393         else
 394                 return FailOneAttempt(IO);
 395 }
 396
 397 eNextState get_one_mx_host_ip(AsyncIO *IO)
 398 {
 399         SmtpOutMsg * Msg = IO->Data;
 400         /*
 401          * here we start with the lookup of one host. it might be...
 402          * - the relay host *sigh*
 403          * - the direct hostname if there was no mx record
 404          * - one of the mx'es
 405          */
 406
 407         InitC_ares_dns(IO);
 408
 409         EVS_syslog(LOG_DEBUG, "SMTP: %s\n", __FUNCTION__);
 410
 411         EVS_syslog(LOG_DEBUG,
 412                   "SMTP client[%ld]: looking up %s-Record %s : %d ...\n",
 413                   Msg->n,
 414                   (Msg->pCurrRelay->IPv6)? "aaaa": "a",
 415                   Msg->pCurrRelay->Host,
 416                   Msg->pCurrRelay->Port);
 417
 418         if (!QueueQuery((Msg->pCurrRelay->IPv6)? ns_t_aaaa : ns_t_a,
 419                         Msg->pCurrRelay->Host,
 420                         &Msg->IO,
 421                         &Msg->HostLookup,
 422                         get_one_mx_host_ip_done))
 423         {
 424                 Msg->MyQEntry->Status = 5;
 425                 StrBufPrintf(Msg->MyQEntry->StatusMessage,
 426                              "No MX hosts found for <%s>", Msg->node);
 427                 Msg->IO.NextState = eTerminateConnection;
 428                 return IO->NextState;
 429         }
 430         IO->NextState = eReadDNSReply;
 431         return IO->NextState;
 432 }
 433
 434
 435 /*****************************************************************************
 436  * here we try to find out about the MX records for our recipients.          *
 437  *****************************************************************************/
 438 eNextState smtp_resolve_mx_record_done(AsyncIO *IO)
 439 {
 440         SmtpOutMsg * Msg = IO->Data;
 441         ParsedURL **pp;
 442
 443         QueryCbDone(IO);
 444
 445         EVS_syslog(LOG_DEBUG, "SMTP: %s\n", __FUNCTION__);
 446
 447         pp = &Msg->Relay;
 448         while ((pp != NULL) && (*pp != NULL) && ((*pp)->Next != NULL))
 449                 pp = &(*pp)->Next;
 450
 451         if ((IO->DNS.Query->DNSStatus == ARES_SUCCESS) &&
 452             (IO->DNS.Query->VParsedDNSReply != NULL))
 453         { /* ok, we found mx records. */
 454
 455                 Msg->CurrMX
 456                         = Msg->AllMX
 457                         = IO->DNS.Query->VParsedDNSReply;
 458                 while (Msg->CurrMX) {
 459                         int i;
 460                         for (i = 0; i < 2; i++) {
 461                                 ParsedURL *p;
 462
 463                                 p = (ParsedURL*) malloc(sizeof(ParsedURL));
 464                                 memset(p, 0, sizeof(ParsedURL));
 465                                 p->Priority = Msg->CurrMX->priority;
 466                                 p->IsIP = 0;
 467                                 p->Port = DefaultMXPort;
 468                                 p->IPv6 = i == 1;
 469                                 p->Host = Msg->CurrMX->host;
 470                                 if (*pp == NULL)
 471                                         *pp = p;
 472                                 else {
 473                                         ParsedURL *ppp = *pp;
 474
 475                                         while ((ppp->Next != NULL) &&
 476                                                (ppp->Next->Priority <= p->Priority))
 477                                                ppp = ppp->Next;
 478                                         if ((ppp == *pp) &&
 479                                             (ppp->Priority > p->Priority)) {
 480                                                 p->Next = *pp;
 481                                                 *pp = p;
 482                                         }
 483                                         else {
 484                                                 p->Next = ppp->Next;
 485                                                 ppp->Next = p;
 486                                         }
 487                                 }
 488                         }
 489                         Msg->CurrMX    = Msg->CurrMX->next;
 490                 }
 491                 Msg->CXFlags   = Msg->CXFlags & F_HAVE_MX;
 492         }
 493         else { /* else fall back to the plain hostname */
 494                 int i;
 495                 for (i = 0; i < 2; i++) {
 496                         ParsedURL *p;
 497
 498                         p = (ParsedURL*) malloc(sizeof(ParsedURL));
 499                         memset(p, 0, sizeof(ParsedURL));
 500                         p->IsIP = 0;
 501                         p->Port = DefaultMXPort;
 502                         p->IPv6 = i == 1;
 503                         p->Host = Msg->node;
 504
 505                         *pp = p;
 506                         pp = &p->Next;
 507                 }
 508                 Msg->CXFlags   = Msg->CXFlags & F_DIRECT;
 509         }
 510         if (Msg->MyQItem->FallBackHost != NULL)
 511         {
 512                 Msg->MyQItem->FallBackHost->Next = *pp;
 513                 *pp = Msg->MyQItem->FallBackHost;
 514         }
 515         Msg->pCurrRelay = Msg->Relay;
 516         return get_one_mx_host_ip(IO);
 517 }
 518
 519 eNextState resolve_mx_records(AsyncIO *IO)
 520 {
 521         SmtpOutMsg * Msg = IO->Data;
 522
 523         EVS_syslog(LOG_DEBUG, "SMTP: %s\n", __FUNCTION__);
 524         /* start resolving MX records here. */
 525         if (!QueueQuery(ns_t_mx,
 526                         Msg->node,
 527                         &Msg->IO,
 528                         &Msg->MxLookup,
 529                         smtp_resolve_mx_record_done))
 530         {
 531                 Msg->MyQEntry->Status = 5;
 532                 StrBufPrintf(Msg->MyQEntry->StatusMessage,
 533                              "No MX hosts found for <%s>", Msg->node);
 534                 return IO->NextState;
 535         }
 536         Msg->IO.NextState = eReadDNSReply;
 537         return IO->NextState;
 538 }
 539
 540
 541
 542 /******************************************************************************
 543  *  so, we're going to start a SMTP delivery.  lets get it on.                *
 544  ******************************************************************************/
 545
 546 SmtpOutMsg *new_smtp_outmsg(OneQueItem *MyQItem,
 547                             MailQEntry *MyQEntry,
 548                             int MsgCount)
 549 {
 550         SmtpOutMsg * Msg;
 551
 552         Msg = (SmtpOutMsg *) malloc(sizeof(SmtpOutMsg));
 553         memset(Msg, 0, sizeof(SmtpOutMsg));
 554
 555         Msg->n                = MsgCount;
 556         Msg->MyQEntry         = MyQEntry;
 557         Msg->MyQItem          = MyQItem;
 558         Msg->pCurrRelay       = MyQItem->URL;
 559
 560         InitIOStruct(&Msg->IO,
 561                      Msg,
 562                      eReadMessage,
 563                      SMTP_C_ReadServerStatus,
 564                      SMTP_C_DNSFail,
 565                      SMTP_C_DispatchWriteDone,
 566                      SMTP_C_DispatchReadDone,
 567                      SMTP_C_Terminate,
 568                      SMTP_C_TerminateDB,
 569                      SMTP_C_ConnFail,
 570                      SMTP_C_Timeout,
 571                      SMTP_C_Shutdown);
 572
 573         Msg->IO.ErrMsg = Msg->MyQEntry->StatusMessage;
 574
 575         return Msg;
 576 }
 577
 578 void smtp_try_one_queue_entry(OneQueItem *MyQItem,
 579                               MailQEntry *MyQEntry,
 580                               StrBuf *MsgText,
 581                         /*KeepMsgText allows us to use MsgText as ours.*/
 582                               int KeepMsgText,
 583                               int MsgCount)
 584 {
 585         SmtpOutMsg *Msg;
 586
 587         syslog(LOG_DEBUG, "SMTP: %s\n", __FUNCTION__);
 588
 589         Msg = new_smtp_outmsg(MyQItem, MyQEntry, MsgCount);
 590         if (KeepMsgText) Msg->msgtext = MsgText;
 591         else             Msg->msgtext = NewStrBufDup(MsgText);
 592
 593         if (smtp_resolve_recipients(Msg)) {
 594
 595                 safestrncpy(
 596                         ((CitContext *)Msg->IO.CitContext)->cs_host,
 597                         Msg->node,
 598                         sizeof(((CitContext *)
 599                                 Msg->IO.CitContext)->cs_host));
 600
 601                 syslog(LOG_DEBUG, "SMTP Starting: [%ld] <%s> CC <%d> \n",
 602                        Msg->MyQItem->MessageID,
 603                        ChrPtr(Msg->MyQEntry->Recipient),
 604                        ((CitContext*)Msg->IO.CitContext)->cs_pid);
 605                 if (Msg->pCurrRelay == NULL)
 606                         QueueEventContext(&Msg->IO,
 607                                           resolve_mx_records);
 608                 else { /* oh... via relay host */
 609                         if (Msg->pCurrRelay->IsIP) {
 610                                 QueueEventContext(&Msg->IO,
 611                                                   mx_connect_ip);
 612                         }
 613                         else {
 614                                 /* uneducated admin has chosen to
 615                                    add DNS to the equation... */
 616                                 QueueEventContext(&Msg->IO,
 617                                                   get_one_mx_host_ip);
 618                         }
 619                 }
 620         }
 621         else {
 622                 /* No recipients? well fail then. */
 623                 if ((Msg==NULL) ||
 624                     (Msg->MyQEntry == NULL)) {
 625                         Msg->MyQEntry->Status = 5;
 626                         StrBufPlain(Msg->MyQEntry->StatusMessage,
 627                                     HKEY("Invalid Recipient!"));
 628                 }
 629                 FinalizeMessageSend_1(&Msg->IO);
 630                 FinalizeMessageSend_DB_1(&Msg->IO);
 631                 FinalizeMessageSend_DB_2(&Msg->IO);
 632                 FinalizeMessageSend_DB_3(&Msg->IO);
 633                 FinalizeMessageSend_DB(&Msg->IO);
 634         }
 635 }
 636
 637
 638
 639
 640
 641
 642 /*****************************************************************************/
 643 /*                     SMTP CLIENT DISPATCHER                                */
 644 /*****************************************************************************/
 645
 646 void SMTPSetTimeout(eNextState NextTCPState, SmtpOutMsg *Msg)
 647 {
 648         double Timeout = 0.0;
 649         AsyncIO *IO = &Msg->IO;
 650
 651         EVS_syslog(LOG_DEBUG, "SMTP: %s\n", __FUNCTION__);
 652
 653         switch (NextTCPState) {
 654         case eSendFile:
 655         case eSendReply:
 656         case eSendMore:
 657                 Timeout = SMTP_C_SendTimeouts[Msg->State];
 658                 if (Msg->State == eDATABody) {
 659                         /* if we're sending a huge message,
 660                          * we need more time.
 661                          */
 662                         Timeout += StrLength(Msg->msgtext) / 512;
 663                 }
 664                 break;
 665         case eReadMessage:
 666                 Timeout = SMTP_C_ReadTimeouts[Msg->State];
 667                 if (Msg->State == eDATATerminateBody) {
 668                         /*
 669                          * some mailservers take a nap before accepting
 670                          * the message content inspection and such.
 671                          */
 672                         Timeout += StrLength(Msg->msgtext) / 512;
 673                 }
 674                 break;
 675         case eSendDNSQuery:
 676         case eReadDNSReply:
 677         case eDBQuery:
 678         case eReadFile:
 679         case eReadMore:
 680         case eReadPayload:
 681         case eConnect:
 682         case eTerminateConnection:
 683         case eAbort:
 684                 return;
 685         }
 686         SetNextTimeout(&Msg->IO, Timeout);
 687 }
 688 eNextState SMTP_C_DispatchReadDone(AsyncIO *IO)
 689 {
 690         EVS_syslog(LOG_DEBUG, "SMTP: %s\n", __FUNCTION__);
 691         SmtpOutMsg *Msg = IO->Data;
 692         eNextState rc;
 693
 694         rc = ReadHandlers[Msg->State](Msg);
 695         if (rc != eAbort)
 696         {
 697                 Msg->State++;
 698                 SMTPSetTimeout(rc, Msg);
 699         }
 700         return rc;
 701 }
 702 eNextState SMTP_C_DispatchWriteDone(AsyncIO *IO)
 703 {
 704         EVS_syslog(LOG_DEBUG, "SMTP: %s\n", __FUNCTION__);
 705         SmtpOutMsg *Msg = IO->Data;
 706         eNextState rc;
 707
 708         rc = SendHandlers[Msg->State](Msg);
 709         SMTPSetTimeout(rc, Msg);
 710         return rc;
 711 }
 712
 713
 714 /*****************************************************************************/
 715 /*                     SMTP CLIENT ERROR CATCHERS                            */
 716 /*****************************************************************************/
 717 eNextState SMTP_C_Terminate(AsyncIO *IO)
 718 {
 719         SmtpOutMsg *Msg = IO->Data;
 720
 721         EVS_syslog(LOG_DEBUG, "SMTP: %s\n", __FUNCTION__);
 722         return FinalizeMessageSend(Msg);
 723 }
 724 eNextState SMTP_C_TerminateDB(AsyncIO *IO)
 725 {
 726         EVS_syslog(LOG_DEBUG, "SMTP: %s\n", __FUNCTION__);
 727         return FinalizeMessageSend_DB(IO);
 728 }
 729 eNextState SMTP_C_Timeout(AsyncIO *IO)
 730 {
 731         SmtpOutMsg *Msg = IO->Data;
 732
 733         Msg->MyQEntry->Status = 4;
 734         EVS_syslog(LOG_DEBUG, "SMTP: %s\n", __FUNCTION__);
 735         StrBufPlain(IO->ErrMsg, CKEY(ReadErrors[Msg->State]));
 736         if (Msg->State > eRCPT)
 737                 return eAbort;
 738         else
 739                 return FailOneAttempt(IO);
 740 }
 741 eNextState SMTP_C_ConnFail(AsyncIO *IO)
 742 {
 743         SmtpOutMsg *Msg = IO->Data;
 744
 745         Msg->MyQEntry->Status = 4;
 746         EVS_syslog(LOG_DEBUG, "SMTP: %s\n", __FUNCTION__);
 747         StrBufPlain(IO->ErrMsg, CKEY(ReadErrors[Msg->State]));
 748         return FailOneAttempt(IO);
 749 }
 750 eNextState SMTP_C_DNSFail(AsyncIO *IO)
 751 {
 752         SmtpOutMsg *Msg = IO->Data;
 753         Msg->MyQEntry->Status = 4;
 754         EVS_syslog(LOG_DEBUG, "SMTP: %s\n", __FUNCTION__);
 755         return FailOneAttempt(IO);
 756 }
 757 eNextState SMTP_C_Shutdown(AsyncIO *IO)
 758 {
 759         EVS_syslog(LOG_DEBUG, "SMTP: %s\n", __FUNCTION__);
 760         SmtpOutMsg *Msg = IO->Data;
 761
 762         Msg->MyQEntry->Status = 3;
 763         StrBufPlain(Msg->MyQEntry->StatusMessage,
 764                     HKEY("server shutdown during message submit."));
 765         return FinalizeMessageSend(Msg);
 766 }
 767
 768
 769 /**
 770  * @brief lineread Handler;
 771  * understands when to read more SMTP lines, and when this is a one-lined reply.
 772  */
 773 eReadState SMTP_C_ReadServerStatus(AsyncIO *IO)
 774 {
 775         eReadState Finished = eBufferNotEmpty;
 776
 777         while (Finished == eBufferNotEmpty) {
 778                 Finished = StrBufChunkSipLine(IO->IOBuf, &IO->RecvBuf);
 779
 780                 switch (Finished) {
 781                 case eMustReadMore: /// read new from socket...
 782                         return Finished;
 783                         break;
 784                 case eBufferNotEmpty: /* shouldn't happen... */
 785                 case eReadSuccess: /// done for now...
 786                         if (StrLength(IO->IOBuf) < 4)
 787                                 continue;
 788                         if (ChrPtr(IO->IOBuf)[3] == '-')
 789                                 Finished = eBufferNotEmpty;
 790                         else
 791                                 return Finished;
 792                         break;
 793                 case eReadFail: /// WHUT?
 794                         ///todo: shut down!
 795                         break;
 796                 }
 797         }
 798         return Finished;
 799 }
 800
 801 CTDL_MODULE_INIT(smtp_eventclient)
 802 {
 803         return "smtpeventclient";
 804 }