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 void DeleteSmtpOutMsg(void *v)
  95 {
  96         SmtpOutMsg *Msg = v;
  97         AsyncIO *IO = &Msg->IO;
  98         EV_syslog(LOG_DEBUG, "%s Exit\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
 126 /******************************************************************************
 127  * So, we're finished with sending (regardless of success or failure)         *
 128  * This Message might be referenced by several Queue-Items, if we're the last,*
 129  * we need to free the memory and send bounce messages (on terminal failure)  *
 130  * else we just free our SMTP-Message struct.                                 *
 131  ******************************************************************************/
 132 eNextState FinalizeMessageSend_DB(AsyncIO *IO)
 133 {
 134         const char *Status;
 135         SmtpOutMsg *Msg = IO->Data;
 136
 137         if (Msg->MyQEntry->Status == 2)
 138                 Status = "Delivery successful.";
 139         else if (Msg->MyQEntry->Status == 5)
 140                 Status = "Delivery failed permanently; giving up.";
 141         else
 142                 Status = "Delivery failed temporarily; will retry later.";
 143
 144         EVS_syslog(LOG_INFO,
 145                    "%s Time[%fs] Recipient <%s> @ <%s> (%s) Status message: %s\n",
 146                    Status,
 147                    Msg->IO.Now - Msg->IO.StartIO,
 148                    Msg->user,
 149                    Msg->node,
 150                    Msg->name,
 151                    ChrPtr(Msg->MyQEntry->StatusMessage));
 152
 153
 154         Msg->IDestructQueItem = DecreaseQReference(Msg->MyQItem);
 155
 156         Msg->nRemain = CountActiveQueueEntries(Msg->MyQItem, 0);
 157
 158         if (Msg->MyQEntry->Active &&
 159             !Msg->MyQEntry->StillActive &&
 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, Msg->pCurrRelay);
 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, 1);
 238
 239         if (Msg->pCurrRelay != NULL)
 240                 Msg->pCurrRelay = Msg->pCurrRelay->Next;
 241         if ((Msg->pCurrRelay != NULL) &&
 242             !Msg->pCurrRelay->IsRelay &&
 243             Msg->MyQItem->HaveRelay)
 244         {
 245                 EVS_syslog(LOG_DEBUG, "%s Aborting; last relay failed.\n", __FUNCTION__);
 246                 return eAbort;
 247         }
 248
 249         if (Msg->pCurrRelay == NULL) {
 250                 EVS_syslog(LOG_DEBUG, "%s Aborting\n", __FUNCTION__);
 251                 return eAbort;
 252         }
 253         if (Msg->pCurrRelay->IsIP) {
 254                 EVS_syslog(LOG_DEBUG, "%s connecting IP\n", __FUNCTION__);
 255                 return mx_connect_ip(IO);
 256         }
 257         else {
 258                 EVS_syslog(LOG_DEBUG,
 259                            "%s resolving next MX Record\n",
 260                            __FUNCTION__);
 261                 return get_one_mx_host_ip(IO);
 262         }
 263 }
 264
 265
 266 void SetConnectStatus(AsyncIO *IO)
 267 {
 268         SmtpOutMsg *Msg = IO->Data;
 269         char buf[256];
 270         void *src;
 271
 272         buf[0] = '\0';
 273
 274         if (IO->ConnectMe->IPv6) {
 275                 src = &IO->ConnectMe->Addr.sin6_addr;
 276         }
 277         else {
 278                 struct sockaddr_in *addr;
 279
 280                 addr = (struct sockaddr_in *)&IO->ConnectMe->Addr;
 281                 src = &addr->sin_addr.s_addr;
 282         }
 283
 284         inet_ntop((IO->ConnectMe->IPv6)?AF_INET6:AF_INET,
 285                   src,
 286                   buf,
 287                   sizeof(buf));
 288
 289         if (Msg->mx_host == NULL)
 290                 Msg->mx_host = "<no MX-Record>";
 291
 292         EVS_syslog(LOG_INFO,
 293                   "connecting to %s [%s]:%d ...\n",
 294                   Msg->mx_host,
 295                   buf,
 296                   Msg->IO.ConnectMe->Port);
 297
 298         Msg->MyQEntry->Status = 4;
 299         StrBufPrintf(Msg->MyQEntry->StatusMessage,
 300                      "Timeout while connecting %s [%s]:%d ",
 301                      Msg->mx_host,
 302                      buf,
 303                      Msg->IO.ConnectMe->Port);
 304         Msg->IO.NextState = eConnect;
 305 }
 306
 307 /*****************************************************************************
 308  * So we connect our Relay IP here.                                          *
 309  *****************************************************************************/
 310 eNextState mx_connect_ip(AsyncIO *IO)
 311 {
 312         SmtpOutMsg *Msg = IO->Data;
 313
 314         EVS_syslog(LOG_DEBUG, "%s\n", __FUNCTION__);
 315
 316         IO->ConnectMe = Msg->pCurrRelay;
 317         Msg->State = eConnectMX;
 318
 319         SetConnectStatus(IO);
 320
 321         return EvConnectSock(IO,
 322                              SMTP_C_ConnTimeout,
 323                              SMTP_C_ReadTimeouts[0],
 324                              1);
 325 }
 326
 327 eNextState get_one_mx_host_ip_done(AsyncIO *IO)
 328 {
 329         SmtpOutMsg *Msg = IO->Data;
 330         struct hostent *hostent;
 331
 332         IO->ConnectMe = Msg->pCurrRelay;
 333
 334         QueryCbDone(IO);
 335         EVS_syslog(LOG_DEBUG, "%s Time[%fs]\n",
 336                    __FUNCTION__,
 337                    IO->Now - IO->DNS.Start);
 338
 339         hostent = Msg->HostLookup.VParsedDNSReply;
 340         if ((Msg->HostLookup.DNSStatus == ARES_SUCCESS) &&
 341             (hostent != NULL) ) {
 342                 memset(&Msg->pCurrRelay->Addr, 0, sizeof(struct in6_addr));
 343                 if (Msg->pCurrRelay->IPv6) {
 344                         memcpy(&Msg->pCurrRelay->Addr.sin6_addr.s6_addr,
 345                                &hostent->h_addr_list[0],
 346                                sizeof(struct in6_addr));
 347
 348                         Msg->pCurrRelay->Addr.sin6_family =
 349                                 hostent->h_addrtype;
 350                         Msg->pCurrRelay->Addr.sin6_port =
 351                                 htons(Msg->IO.ConnectMe->Port);
 352                 }
 353                 else {
 354                         struct sockaddr_in *addr;
 355                         /*
 356                          * Bypass the ns lookup result like this:
 357                          * IO->Addr.sin_addr.s_addr = inet_addr("127.0.0.1");
 358                          * addr->sin_addr.s_addr =
 359                          *   htonl((uint32_t)&hostent->h_addr_list[0]);
 360                          */
 361
 362                         addr = (struct sockaddr_in*) &Msg->pCurrRelay->Addr;
 363
 364                         memcpy(&addr->sin_addr.s_addr,
 365                                hostent->h_addr_list[0],
 366                                sizeof(uint32_t));
 367
 368                         addr->sin_family = hostent->h_addrtype;
 369                         addr->sin_port   = htons(Msg->IO.ConnectMe->Port);
 370                 }
 371                 Msg->mx_host = Msg->pCurrRelay->Host;
 372                 if (Msg->HostLookup.VParsedDNSReply != NULL) {
 373                         Msg->HostLookup.DNSReplyFree(Msg->HostLookup.VParsedDNSReply);
 374                         Msg->HostLookup.VParsedDNSReply = NULL;
 375                 }
 376                 return mx_connect_ip(IO);
 377         }
 378         else {
 379                 if (Msg->HostLookup.VParsedDNSReply != NULL) {
 380                         Msg->HostLookup.DNSReplyFree(Msg->HostLookup.VParsedDNSReply);
 381                         Msg->HostLookup.VParsedDNSReply = NULL;
 382                 }
 383                 return FailOneAttempt(IO);
 384         }
 385 }
 386
 387 eNextState get_one_mx_host_ip(AsyncIO *IO)
 388 {
 389         SmtpOutMsg * Msg = IO->Data;
 390         /*
 391          * here we start with the lookup of one host. it might be...
 392          * - the relay host *sigh*
 393          * - the direct hostname if there was no mx record
 394          * - one of the mx'es
 395          */
 396
 397         EVS_syslog(LOG_DEBUG, "%s\n", __FUNCTION__);
 398
 399         EVS_syslog(LOG_DEBUG,
 400                   "looking up %s-Record %s : %d ...\n",
 401                   (Msg->pCurrRelay->IPv6)? "aaaa": "a",
 402                   Msg->pCurrRelay->Host,
 403                   Msg->pCurrRelay->Port);
 404
 405         if (!QueueQuery((Msg->pCurrRelay->IPv6)? ns_t_aaaa : ns_t_a,
 406                         Msg->pCurrRelay->Host,
 407                         &Msg->IO,
 408                         &Msg->HostLookup,
 409                         get_one_mx_host_ip_done))
 410         {
 411                 Msg->MyQEntry->Status = 5;
 412                 StrBufPrintf(Msg->MyQEntry->StatusMessage,
 413                              "No MX hosts found for <%s>", Msg->node);
 414                 Msg->IO.NextState = eTerminateConnection;
 415                 return IO->NextState;
 416         }
 417         IO->NextState = eReadDNSReply;
 418         return IO->NextState;
 419 }
 420
 421
 422 /*****************************************************************************
 423  * here we try to find out about the MX records for our recipients.          *
 424  *****************************************************************************/
 425 eNextState smtp_resolve_mx_record_done(AsyncIO *IO)
 426 {
 427         SmtpOutMsg * Msg = IO->Data;
 428         ParsedURL **pp;
 429
 430         QueryCbDone(IO);
 431
 432         EVS_syslog(LOG_DEBUG, "%s Time[%fs]\n",
 433                    __FUNCTION__,
 434                    IO->Now - IO->DNS.Start);
 435
 436         pp = &Msg->Relay;
 437         while ((pp != NULL) && (*pp != NULL) && ((*pp)->Next != NULL))
 438                 pp = &(*pp)->Next;
 439
 440         if ((IO->DNS.Query->DNSStatus == ARES_SUCCESS) &&
 441             (IO->DNS.Query->VParsedDNSReply != NULL))
 442         { /* ok, we found mx records. */
 443
 444                 Msg->CurrMX
 445                         = Msg->AllMX
 446                         = IO->DNS.Query->VParsedDNSReply;
 447                 while (Msg->CurrMX) {
 448                         int i;
 449                         for (i = 0; i < 2; i++) {
 450                                 ParsedURL *p;
 451
 452                                 p = (ParsedURL*) malloc(sizeof(ParsedURL));
 453                                 memset(p, 0, sizeof(ParsedURL));
 454                                 p->Priority = Msg->CurrMX->priority;
 455                                 p->IsIP = 0;
 456                                 p->Port = DefaultMXPort;
 457                                 p->IPv6 = i == 1;
 458                                 p->Host = Msg->CurrMX->host;
 459                                 if (*pp == NULL)
 460                                         *pp = p;
 461                                 else {
 462                                         ParsedURL *ppp = *pp;
 463
 464                                         while ((ppp->Next != NULL) &&
 465                                                (ppp->Next->Priority <= p->Priority))
 466                                                ppp = ppp->Next;
 467                                         if ((ppp == *pp) &&
 468                                             (ppp->Priority > p->Priority)) {
 469                                                 p->Next = *pp;
 470                                                 *pp = p;
 471                                         }
 472                                         else {
 473                                                 p->Next = ppp->Next;
 474                                                 ppp->Next = p;
 475                                         }
 476                                 }
 477                         }
 478                         Msg->CurrMX    = Msg->CurrMX->next;
 479                 }
 480                 Msg->CXFlags   = Msg->CXFlags & F_HAVE_MX;
 481         }
 482         else { /* else fall back to the plain hostname */
 483                 int i;
 484                 for (i = 0; i < 2; i++) {
 485                         ParsedURL *p;
 486
 487                         p = (ParsedURL*) malloc(sizeof(ParsedURL));
 488                         memset(p, 0, sizeof(ParsedURL));
 489                         p->IsIP = 0;
 490                         p->Port = DefaultMXPort;
 491                         p->IPv6 = i == 1;
 492                         p->Host = Msg->node;
 493
 494                         *pp = p;
 495                         pp = &p->Next;
 496                 }
 497                 Msg->CXFlags   = Msg->CXFlags & F_DIRECT;
 498         }
 499         if (Msg->MyQItem->FallBackHost != NULL)
 500         {
 501                 Msg->MyQItem->FallBackHost->Next = *pp;
 502                 *pp = Msg->MyQItem->FallBackHost;
 503         }
 504         Msg->pCurrRelay = Msg->Relay;
 505         return get_one_mx_host_ip(IO);
 506 }
 507
 508 eNextState resolve_mx_records(AsyncIO *IO)
 509 {
 510         SmtpOutMsg * Msg = IO->Data;
 511
 512         EVS_syslog(LOG_DEBUG, "%s\n", __FUNCTION__);
 513         /* start resolving MX records here. */
 514         if (!QueueQuery(ns_t_mx,
 515                         Msg->node,
 516                         &Msg->IO,
 517                         &Msg->MxLookup,
 518                         smtp_resolve_mx_record_done))
 519         {
 520                 Msg->MyQEntry->Status = 5;
 521                 StrBufPrintf(Msg->MyQEntry->StatusMessage,
 522                              "No MX hosts found for <%s>", Msg->node);
 523                 return IO->NextState;
 524         }
 525         Msg->IO.NextState = eReadDNSReply;
 526         return IO->NextState;
 527 }
 528
 529
 530
 531 /******************************************************************************
 532  *  so, we're going to start a SMTP delivery.  lets get it on.                *
 533  ******************************************************************************/
 534
 535 SmtpOutMsg *new_smtp_outmsg(OneQueItem *MyQItem,
 536                             MailQEntry *MyQEntry,
 537                             int MsgCount)
 538 {
 539         SmtpOutMsg * Msg;
 540
 541         Msg = (SmtpOutMsg *) malloc(sizeof(SmtpOutMsg));
 542         if (Msg == NULL)
 543                 return NULL;
 544         memset(Msg, 0, sizeof(SmtpOutMsg));
 545
 546         Msg->n                = MsgCount;
 547         Msg->MyQEntry         = MyQEntry;
 548         Msg->MyQItem          = MyQItem;
 549         Msg->pCurrRelay       = MyQItem->URL;
 550
 551         InitIOStruct(&Msg->IO,
 552                      Msg,
 553                      eReadMessage,
 554                      SMTP_C_ReadServerStatus,
 555                      SMTP_C_DNSFail,
 556                      SMTP_C_DispatchWriteDone,
 557                      SMTP_C_DispatchReadDone,
 558                      SMTP_C_Terminate,
 559                      SMTP_C_TerminateDB,
 560                      SMTP_C_ConnFail,
 561                      SMTP_C_Timeout,
 562                      SMTP_C_Shutdown);
 563
 564         Msg->IO.ErrMsg = Msg->MyQEntry->StatusMessage;
 565
 566         return Msg;
 567 }
 568
 569 void smtp_try_one_queue_entry(OneQueItem *MyQItem,
 570                               MailQEntry *MyQEntry,
 571                               StrBuf *MsgText,
 572                         /*KeepMsgText allows us to use MsgText as ours.*/
 573                               int KeepMsgText,
 574                               int MsgCount)
 575 {
 576         SmtpOutMsg *Msg;
 577
 578         SMTPC_syslog(LOG_DEBUG, "%s\n", __FUNCTION__);
 579
 580         Msg = new_smtp_outmsg(MyQItem, MyQEntry, MsgCount);
 581         if (Msg == NULL) {
 582                 SMTPC_syslog(LOG_DEBUG, "%s Failed to alocate message context.\n", __FUNCTION__);
 583                 if (KeepMsgText)
 584                         FreeStrBuf (&MsgText);
 585                 return;
 586         }
 587         if (KeepMsgText) Msg->msgtext = MsgText;
 588         else             Msg->msgtext = NewStrBufDup(MsgText);
 589
 590         if (((!MyQItem->HaveRelay ||
 591               (MyQItem->URL != NULL)) &&
 592              smtp_resolve_recipients(Msg)))
 593         {
 594                 safestrncpy(
 595                         ((CitContext *)Msg->IO.CitContext)->cs_host,
 596                         Msg->node,
 597                         sizeof(((CitContext *)
 598                                 Msg->IO.CitContext)->cs_host));
 599
 600                 SMTPC_syslog(LOG_DEBUG, "Starting: [%ld] <%s> CC <%d> \n",
 601                              Msg->MyQItem->MessageID,
 602                              ChrPtr(Msg->MyQEntry->Recipient),
 603                              ((CitContext*)Msg->IO.CitContext)->cs_pid);
 604                 if (Msg->pCurrRelay == NULL)
 605                         QueueEventContext(&Msg->IO,
 606                                           resolve_mx_records);
 607                 else { /* oh... via relay host */
 608                         if (Msg->pCurrRelay->IsIP) {
 609                                 QueueEventContext(&Msg->IO,
 610                                                   mx_connect_ip);
 611                         }
 612                         else {
 613                                 /* uneducated admin has chosen to
 614                                    add DNS to the equation... */
 615                                 QueueEventContext(&Msg->IO,
 616                                                   get_one_mx_host_ip);
 617                         }
 618                 }
 619         }
 620         else {
 621                 /* No recipients? well fail then. */
 622                 if (Msg->MyQEntry != NULL) {
 623                         Msg->MyQEntry->Status = 5;
 624                         if (StrLength(Msg->MyQEntry->StatusMessage) == 0)
 625                                 StrBufPlain(Msg->MyQEntry->StatusMessage,
 626                                             HKEY("Invalid Recipient!"));
 627                 }
 628                 FinalizeMessageSend_DB(&Msg->IO);
 629                 DeleteSmtpOutMsg(&Msg->IO);
 630         }
 631 }
 632
 633
 634
 635
 636
 637
 638 /*****************************************************************************/
 639 /*                     SMTP CLIENT DISPATCHER                                */
 640 /*****************************************************************************/
 641
 642 void SMTPSetTimeout(eNextState NextTCPState, SmtpOutMsg *Msg)
 643 {
 644         double Timeout = 0.0;
 645         AsyncIO *IO = &Msg->IO;
 646
 647         EVS_syslog(LOG_DEBUG, "%s\n", __FUNCTION__);
 648
 649         switch (NextTCPState) {
 650         case eSendFile:
 651         case eSendReply:
 652         case eSendMore:
 653                 Timeout = SMTP_C_SendTimeouts[Msg->State];
 654                 if (Msg->State == eDATABody) {
 655                         /* if we're sending a huge message,
 656                          * we need more time.
 657                          */
 658                         Timeout += StrLength(Msg->msgtext) / 512;
 659                 }
 660                 break;
 661         case eReadMessage:
 662                 Timeout = SMTP_C_ReadTimeouts[Msg->State];
 663                 if (Msg->State == eDATATerminateBody) {
 664                         /*
 665                          * some mailservers take a nap before accepting
 666                          * the message content inspection and such.
 667                          */
 668                         Timeout += StrLength(Msg->msgtext) / 512;
 669                 }
 670                 break;
 671         case eSendDNSQuery:
 672         case eReadDNSReply:
 673         case eDBQuery:
 674         case eReadFile:
 675         case eReadMore:
 676         case eReadPayload:
 677         case eConnect:
 678         case eTerminateConnection:
 679         case eAbort:
 680                 return;
 681         }
 682         SetNextTimeout(&Msg->IO, Timeout);
 683 }
 684 eNextState SMTP_C_DispatchReadDone(AsyncIO *IO)
 685 {
 686         EVS_syslog(LOG_DEBUG, "%s\n", __FUNCTION__);
 687         SmtpOutMsg *Msg = IO->Data;
 688         eNextState rc;
 689
 690         rc = ReadHandlers[Msg->State](Msg);
 691         if (rc != eAbort)
 692         {
 693                 Msg->State++;
 694                 SMTPSetTimeout(rc, Msg);
 695         }
 696         return rc;
 697 }
 698 eNextState SMTP_C_DispatchWriteDone(AsyncIO *IO)
 699 {
 700         EVS_syslog(LOG_DEBUG, "%s\n", __FUNCTION__);
 701         SmtpOutMsg *Msg = IO->Data;
 702         eNextState rc;
 703
 704         rc = SendHandlers[Msg->State](Msg);
 705         SMTPSetTimeout(rc, Msg);
 706         return rc;
 707 }
 708
 709
 710 /*****************************************************************************/
 711 /*                     SMTP CLIENT ERROR CATCHERS                            */
 712 /*****************************************************************************/
 713 eNextState SMTP_C_Terminate(AsyncIO *IO)
 714 {
 715         SmtpOutMsg *Msg = IO->Data;
 716
 717         EVS_syslog(LOG_DEBUG, "%s\n", __FUNCTION__);
 718         return FinalizeMessageSend(Msg);
 719 }
 720 eNextState SMTP_C_TerminateDB(AsyncIO *IO)
 721 {
 722         EVS_syslog(LOG_DEBUG, "%s\n", __FUNCTION__);
 723         return Terminate(IO);
 724 }
 725 eNextState SMTP_C_Timeout(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         if (Msg->State > eRCPT)
 733                 return eAbort;
 734         else
 735                 return FailOneAttempt(IO);
 736 }
 737 eNextState SMTP_C_ConnFail(AsyncIO *IO)
 738 {
 739         SmtpOutMsg *Msg = IO->Data;
 740
 741         Msg->MyQEntry->Status = 4;
 742         EVS_syslog(LOG_DEBUG, "%s\n", __FUNCTION__);
 743         StrBufPlain(IO->ErrMsg, CKEY(ReadErrors[Msg->State]));
 744         return FailOneAttempt(IO);
 745 }
 746 eNextState SMTP_C_DNSFail(AsyncIO *IO)
 747 {
 748         SmtpOutMsg *Msg = IO->Data;
 749         Msg->MyQEntry->Status = 4;
 750         EVS_syslog(LOG_DEBUG, "%s\n", __FUNCTION__);
 751         return FailOneAttempt(IO);
 752 }
 753 eNextState SMTP_C_Shutdown(AsyncIO *IO)
 754 {
 755         EVS_syslog(LOG_DEBUG, "%s\n", __FUNCTION__);
 756         SmtpOutMsg *Msg = IO->Data;
 757
 758         switch (IO->NextState) {
 759         case eSendDNSQuery:
 760         case eReadDNSReply:
 761
 762                 /* todo: abort c-ares */
 763         case eConnect:
 764         case eSendReply:
 765         case eSendMore:
 766         case eSendFile:
 767         case eReadMessage:
 768         case eReadMore:
 769         case eReadPayload:
 770         case eReadFile:
 771                 StopClientWatchers(IO, 1);
 772                 break;
 773         case eDBQuery:
 774
 775                 break;
 776         case eTerminateConnection:
 777         case eAbort:
 778                 break;
 779         }
 780         Msg->MyQEntry->Status = 3;
 781         StrBufPlain(Msg->MyQEntry->StatusMessage,
 782                     HKEY("server shutdown during message submit."));
 783         return FinalizeMessageSend(Msg);
 784 }
 785
 786
 787 /**
 788  * @brief lineread Handler;
 789  * understands when to read more SMTP lines, and when this is a one-lined reply.
 790  */
 791 eReadState SMTP_C_ReadServerStatus(AsyncIO *IO)
 792 {
 793         eReadState Finished = eBufferNotEmpty;
 794
 795         while (Finished == eBufferNotEmpty) {
 796                 Finished = StrBufChunkSipLine(IO->IOBuf, &IO->RecvBuf);
 797
 798                 switch (Finished) {
 799                 case eMustReadMore: /// read new from socket...
 800                         return Finished;
 801                         break;
 802                 case eBufferNotEmpty: /* shouldn't happen... */
 803                 case eReadSuccess: /// done for now...
 804                         if (StrLength(IO->IOBuf) < 4)
 805                                 continue;
 806                         if (ChrPtr(IO->IOBuf)[3] == '-')
 807                                 Finished = eBufferNotEmpty;
 808                         else
 809                                 return Finished;
 810                         break;
 811                 case eReadFail: /// WHUT?
 812                         ///todo: shut down!
 813                         break;
 814                 }
 815         }
 816         return Finished;
 817 }
 818
 819 void LogDebugEnableSMTPClient(const int n)
 820 {
 821         SMTPClientDebugEnabled = n;
 822 }
 823
 824 CTDL_MODULE_INIT(smtp_eventclient)
 825 {
 826         if (!threading)
 827                 CtdlRegisterDebugFlagHook(HKEY("smtpeventclient"), LogDebugEnableSMTPClient, &SMTPClientDebugEnabled);
 828         return "smtpeventclient";
 829 }