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) 1998-2009 by the citadel.org team
  24  *
  25  *  This program is free software; you can redistribute it and/or modify
  26  *  it under the terms of the GNU General Public License as published by
  27  *  the Free Software Foundation; either version 3 of the License, or
  28  *  (at your option) any later version.
  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  *  You should have received a copy of the GNU General Public License
  36  *  along with this program; if not, write to the Free Software
  37  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  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
  98         /* these are kept in our own space and free'd below */
  99         Msg->IO.ConnectMe = NULL;
 100
 101         ares_free_data(Msg->AllMX);
 102         if (Msg->HostLookup.VParsedDNSReply != NULL)
 103                 Msg->HostLookup.DNSReplyFree(Msg->HostLookup.VParsedDNSReply);
 104         FreeURL(&Msg->Relay);
 105         FreeStrBuf(&Msg->msgtext);
 106         FreeAsyncIOContents(&Msg->IO);
 107         memset (Msg, 0, sizeof(SmtpOutMsg)); /* just to be shure... */
 108         free(Msg);
 109 }
 110
 111 eNextState SMTP_C_Shutdown(AsyncIO *IO);
 112 eNextState SMTP_C_Timeout(AsyncIO *IO);
 113 eNextState SMTP_C_ConnFail(AsyncIO *IO);
 114 eNextState SMTP_C_DispatchReadDone(AsyncIO *IO);
 115 eNextState SMTP_C_DispatchWriteDone(AsyncIO *IO);
 116 eNextState SMTP_C_DNSFail(AsyncIO *IO);
 117 eNextState SMTP_C_Terminate(AsyncIO *IO);
 118 eReadState SMTP_C_ReadServerStatus(AsyncIO *IO);
 119
 120 eNextState mx_connect_ip(AsyncIO *IO);
 121 eNextState get_one_mx_host_ip(AsyncIO *IO);
 122
 123 /******************************************************************************
 124  * So, we're finished with sending (regardless of success or failure)         *
 125  * This Message might be referenced by several Queue-Items, if we're the last,*
 126  * we need to free the memory and send bounce messages (on terminal failure)  *
 127  * else we just free our SMTP-Message struct.                                 *
 128  ******************************************************************************/
 129 void FinalizeMessageSend(SmtpOutMsg *Msg)
 130 {
 131         int IDestructQueItem;
 132         int nRemain;
 133         StrBuf *MsgData;
 134         AsyncIO *IO = &Msg->IO;
 135
 136         IDestructQueItem = DecreaseQReference(Msg->MyQItem);
 137
 138         nRemain = CountActiveQueueEntries(Msg->MyQItem);
 139
 140         if ((nRemain > 0) || IDestructQueItem)
 141                 MsgData = SerializeQueueItem(Msg->MyQItem);
 142         else
 143                 MsgData = NULL;
 144
 145         /*
 146          * Uncompleted delivery instructions remain, so delete the old
 147          * instructions and replace with the updated ones.
 148          */
 149         EVS_syslog(LOG_DEBUG, "SMTPQD: %ld", Msg->MyQItem->QueMsgID);
 150         CtdlDeleteMessages(SMTP_SPOOLOUT_ROOM, &Msg->MyQItem->QueMsgID, 1, "");
 151
 152         if (IDestructQueItem)
 153                 smtpq_do_bounce(Msg->MyQItem,Msg->msgtext);
 154
 155         if (nRemain > 0)
 156         {
 157                 struct CtdlMessage *msg;
 158                 msg = malloc(sizeof(struct CtdlMessage));
 159                 memset(msg, 0, sizeof(struct CtdlMessage));
 160                 msg->cm_magic = CTDLMESSAGE_MAGIC;
 161                 msg->cm_anon_type = MES_NORMAL;
 162                 msg->cm_format_type = FMT_RFC822;
 163                 msg->cm_fields['M'] = SmashStrBuf(&MsgData);
 164                 Msg->MyQItem->QueMsgID =
 165                         CtdlSubmitMsg(msg, NULL, SMTP_SPOOLOUT_ROOM, QP_EADDR);
 166                 EVS_syslog(LOG_DEBUG, "SMTPQ: %ld", Msg->MyQItem->QueMsgID);
 167                 CtdlFreeMessage(msg);
 168         }
 169         else {
 170                 CtdlDeleteMessages(SMTP_SPOOLOUT_ROOM,
 171                                    &Msg->MyQItem->MessageID,
 172                                    1,
 173                                    "");
 174                 FreeStrBuf(&MsgData);
 175         }
 176         RemoveContext(Msg->IO.CitContext);
 177         if (IDestructQueItem)
 178                 RemoveQItem(Msg->MyQItem);
 179         DeleteSmtpOutMsg(Msg);
 180 }
 181
 182 eNextState FailOneAttempt(AsyncIO *IO)
 183 {
 184         SmtpOutMsg *SendMsg = IO->Data;
 185
 186         if (SendMsg->MyQEntry->Status == 2)
 187                 return eAbort;
 188
 189         /*
 190          * possible ways here:
 191          * - connection timeout
 192          * - dns lookup failed
 193          */
 194         StopClientWatchers(IO);
 195
 196         if (SendMsg->pCurrRelay != NULL)
 197                 SendMsg->pCurrRelay = SendMsg->pCurrRelay->Next;
 198
 199         if (SendMsg->pCurrRelay == NULL) {
 200                 EVS_syslog(LOG_DEBUG, "SMTP: %s Aborting\n", __FUNCTION__);
 201                 return eAbort;
 202         }
 203         if (SendMsg->pCurrRelay->IsIP) {
 204                 EVS_syslog(LOG_DEBUG, "SMTP: %s connecting IP\n", __FUNCTION__);
 205                 return mx_connect_ip(IO);
 206         }
 207         else {
 208                 EVS_syslog(LOG_DEBUG, "SMTP: %s resolving next MX Record\n", __FUNCTION__);
 209                 return get_one_mx_host_ip(IO);
 210         }
 211 }
 212
 213
 214 void SetConnectStatus(AsyncIO *IO)
 215 {
 216         SmtpOutMsg *SendMsg = IO->Data;
 217         char buf[256];
 218         void *src;
 219
 220         buf[0] = '\0';
 221
 222         if (IO->ConnectMe->IPv6) {
 223                 src = &IO->ConnectMe->Addr.sin6_addr;
 224         }
 225         else {
 226                 struct sockaddr_in *addr = (struct sockaddr_in *)&IO->ConnectMe->Addr;
 227
 228                 src = &addr->sin_addr.s_addr;
 229         }
 230
 231         inet_ntop((IO->ConnectMe->IPv6)?AF_INET6:AF_INET,
 232                   src,
 233                   buf,
 234                   sizeof(buf));
 235
 236         if (SendMsg->mx_host == NULL)
 237                 SendMsg->mx_host = "<no MX-Record>";
 238
 239         EVS_syslog(LOG_DEBUG,
 240                   "SMTP client[%ld]: connecting to %s [%s]:%d ...\n",
 241                   SendMsg->n,
 242                   SendMsg->mx_host,
 243                   buf,
 244                   SendMsg->IO.ConnectMe->Port);
 245
 246         SendMsg->MyQEntry->Status = 5;
 247         StrBufPrintf(SendMsg->MyQEntry->StatusMessage,
 248                      "Timeout while connecting %s [%s]:%d ",
 249                      SendMsg->mx_host,
 250                      buf,
 251                      SendMsg->IO.ConnectMe->Port);
 252         SendMsg->IO.NextState = eConnect;
 253 }
 254
 255 /*****************************************************************************
 256  * So we connect our Relay IP here.                                          *
 257  *****************************************************************************/
 258 eNextState mx_connect_ip(AsyncIO *IO)
 259 {
 260         SmtpOutMsg *SendMsg = IO->Data;
 261
 262         EVS_syslog(LOG_DEBUG, "SMTP: %s\n", __FUNCTION__);
 263
 264         IO->ConnectMe = SendMsg->pCurrRelay;
 265
 266         SetConnectStatus(IO);
 267
 268         return EvConnectSock(IO,
 269                              SMTP_C_ConnTimeout,
 270                              SMTP_C_ReadTimeouts[0],
 271                              1);
 272 }
 273
 274 eNextState get_one_mx_host_ip_done(AsyncIO *IO)
 275 {
 276         SmtpOutMsg *SendMsg = IO->Data;
 277         struct hostent *hostent;
 278
 279         QueryCbDone(IO);
 280
 281         hostent = SendMsg->HostLookup.VParsedDNSReply;
 282         if ((SendMsg->HostLookup.DNSStatus == ARES_SUCCESS) &&
 283             (hostent != NULL) ) {
 284                 memset(&SendMsg->pCurrRelay->Addr, 0, sizeof(struct in6_addr));
 285                 if (SendMsg->pCurrRelay->IPv6) {
 286                         memcpy(&SendMsg->pCurrRelay->Addr.sin6_addr.s6_addr,
 287                                &hostent->h_addr_list[0],
 288                                sizeof(struct in6_addr));
 289
 290                         SendMsg->pCurrRelay->Addr.sin6_family = hostent->h_addrtype;
 291                         SendMsg->pCurrRelay->Addr.sin6_port   = htons(DefaultMXPort);
 292                 }
 293                 else {
 294                         struct sockaddr_in *addr = (struct sockaddr_in*) &SendMsg->pCurrRelay->Addr;
 295                         /* Bypass the ns lookup result like this: IO->Addr.sin_addr.s_addr = inet_addr("127.0.0.1"); */
 296 //                      addr->sin_addr.s_addr = htonl((uint32_t)&hostent->h_addr_list[0]);
 297                         memcpy(&addr->sin_addr.s_addr,
 298                                hostent->h_addr_list[0],
 299                                sizeof(uint32_t));
 300
 301                         addr->sin_family = hostent->h_addrtype;
 302                         addr->sin_port   = htons(DefaultMXPort);
 303
 304                 }
 305                 SendMsg->mx_host = SendMsg->pCurrRelay->Host;
 306                 return mx_connect_ip(IO);
 307         }
 308         else // TODO: here we need to find out whether there are more mx'es, backup relay, and so on
 309                 return FailOneAttempt(IO);
 310 }
 311
 312 eNextState get_one_mx_host_ip(AsyncIO *IO)
 313 {
 314         SmtpOutMsg * SendMsg = IO->Data;
 315         /*
 316          * here we start with the lookup of one host. it might be...
 317          * - the relay host *sigh*
 318          * - the direct hostname if there was no mx record
 319          * - one of the mx'es
 320          */
 321
 322         InitC_ares_dns(IO);
 323
 324         EVS_syslog(LOG_DEBUG, "SMTP: %s\n", __FUNCTION__);
 325
 326         EVS_syslog(LOG_DEBUG,
 327                   "SMTP client[%ld]: looking up %s-Record %s : %d ...\n",
 328                   SendMsg->n,
 329                   (SendMsg->pCurrRelay->IPv6)? "aaaa": "a",
 330                   SendMsg->pCurrRelay->Host,
 331                   SendMsg->pCurrRelay->Port);
 332
 333         if (!QueueQuery((SendMsg->pCurrRelay->IPv6)? ns_t_aaaa : ns_t_a,
 334                         SendMsg->pCurrRelay->Host,
 335                         &SendMsg->IO,
 336                         &SendMsg->HostLookup,
 337                         get_one_mx_host_ip_done))
 338         {
 339                 SendMsg->MyQEntry->Status = 5;
 340                 StrBufPrintf(SendMsg->MyQEntry->StatusMessage,
 341                              "No MX hosts found for <%s>", SendMsg->node);
 342                 SendMsg->IO.NextState = eTerminateConnection;
 343                 return IO->NextState;
 344         }
 345         IO->NextState = eReadDNSReply;
 346         return IO->NextState;
 347 }
 348
 349
 350 /*****************************************************************************
 351  * here we try to find out about the MX records for our recipients.          *
 352  *****************************************************************************/
 353 eNextState smtp_resolve_mx_record_done(AsyncIO *IO)
 354 {
 355         SmtpOutMsg * SendMsg = IO->Data;
 356         ParsedURL **pp;
 357
 358         QueryCbDone(IO);
 359
 360         EVS_syslog(LOG_DEBUG, "SMTP: %s\n", __FUNCTION__);
 361         pp = &SendMsg->Relay;
 362         while ((pp != NULL) && (*pp != NULL) && ((*pp)->Next != NULL))
 363                 pp = &(*pp)->Next;
 364
 365         if ((IO->DNS.Query->DNSStatus == ARES_SUCCESS) &&
 366             (IO->DNS.Query->VParsedDNSReply != NULL))
 367         { /* ok, we found mx records. */
 368                 SendMsg->IO.ErrMsg = SendMsg->MyQEntry->StatusMessage;
 369
 370                 SendMsg->CurrMX    = SendMsg->AllMX
 371                                    = IO->DNS.Query->VParsedDNSReply;
 372                 while (SendMsg->CurrMX) {
 373                         int i;
 374                         for (i = 0; i < 2; i++) {
 375                                 ParsedURL *p;
 376
 377                                 p = (ParsedURL*) malloc(sizeof(ParsedURL));
 378                                 memset(p, 0, sizeof(ParsedURL));
 379                                 p->IsIP = 0;
 380                                 p->Port = DefaultMXPort;
 381                                 p->IPv6 = i == 1;
 382                                 p->Host = SendMsg->CurrMX->host;
 383
 384                                 *pp = p;
 385                                 pp = &p->Next;
 386                         }
 387                         SendMsg->CurrMX    = SendMsg->CurrMX->next;
 388                 }
 389                 SendMsg->CXFlags   = SendMsg->CXFlags & F_HAVE_MX;
 390         }
 391         else { /* else fall back to the plain hostname */
 392                 int i;
 393                 for (i = 0; i < 2; i++) {
 394                         ParsedURL *p;
 395
 396                         p = (ParsedURL*) malloc(sizeof(ParsedURL));
 397                         memset(p, 0, sizeof(ParsedURL));
 398                         p->IsIP = 0;
 399                         p->Port = DefaultMXPort;
 400                         p->IPv6 = i == 1;
 401                         p->Host = SendMsg->node;
 402
 403                         *pp = p;
 404                         pp = &p->Next;
 405                 }
 406                 SendMsg->CXFlags   = SendMsg->CXFlags & F_DIRECT;
 407         }
 408         *pp = SendMsg->MyQItem->FallBackHost;
 409         SendMsg->pCurrRelay = SendMsg->Relay;
 410         return get_one_mx_host_ip(IO);
 411 }
 412
 413 eNextState resolve_mx_records(AsyncIO *IO)
 414 {
 415         SmtpOutMsg * SendMsg = IO->Data;
 416
 417         EVS_syslog(LOG_DEBUG, "SMTP: %s\n", __FUNCTION__);
 418         /* start resolving MX records here. */
 419         if (!QueueQuery(ns_t_mx,
 420                         SendMsg->node,
 421                         &SendMsg->IO,
 422                         &SendMsg->MxLookup,
 423                         smtp_resolve_mx_record_done))
 424         {
 425                 SendMsg->MyQEntry->Status = 5;
 426                 StrBufPrintf(SendMsg->MyQEntry->StatusMessage,
 427                              "No MX hosts found for <%s>", SendMsg->node);
 428                 return IO->NextState;
 429         }
 430         SendMsg->IO.NextState = eReadDNSReply;
 431         return IO->NextState;
 432 }
 433
 434
 435
 436 /******************************************************************************
 437  *  so, we're going to start a SMTP delivery.  lets get it on.                *
 438  ******************************************************************************/
 439
 440 SmtpOutMsg *new_smtp_outmsg(OneQueItem *MyQItem,
 441                             MailQEntry *MyQEntry,
 442                             int MsgCount)
 443 {
 444         SmtpOutMsg * SendMsg;
 445
 446         SendMsg = (SmtpOutMsg *) malloc(sizeof(SmtpOutMsg));
 447         memset(SendMsg, 0, sizeof(SmtpOutMsg));
 448
 449         SendMsg->n                = MsgCount;
 450         SendMsg->MyQEntry         = MyQEntry;
 451         SendMsg->MyQItem          = MyQItem;
 452         SendMsg->pCurrRelay       = MyQItem->URL;
 453
 454         InitIOStruct(&SendMsg->IO,
 455                      SendMsg,
 456                      eReadMessage,
 457                      SMTP_C_ReadServerStatus,
 458                      SMTP_C_DNSFail,
 459                      SMTP_C_DispatchWriteDone,
 460                      SMTP_C_DispatchReadDone,
 461                      SMTP_C_Terminate,
 462                      SMTP_C_ConnFail,
 463                      SMTP_C_Timeout,
 464                      SMTP_C_Shutdown);
 465
 466         return SendMsg;
 467 }
 468
 469 void smtp_try_one_queue_entry(OneQueItem *MyQItem,
 470                               MailQEntry *MyQEntry,
 471                               StrBuf *MsgText,
 472                               int KeepMsgText,  /* KeepMsgText allows us to use MsgText as ours. */
 473                               int MsgCount)
 474 {
 475         SmtpOutMsg *SendMsg;
 476
 477         syslog(LOG_DEBUG, "SMTP: %s\n", __FUNCTION__);
 478
 479         SendMsg = new_smtp_outmsg(MyQItem, MyQEntry, MsgCount);
 480         if (KeepMsgText) SendMsg->msgtext = MsgText;
 481         else             SendMsg->msgtext = NewStrBufDup(MsgText);
 482
 483         if (smtp_resolve_recipients(SendMsg)) {
 484
 485                 safestrncpy(
 486                         ((CitContext *)SendMsg->IO.CitContext)->cs_host,
 487                         SendMsg->node,
 488                         sizeof(((CitContext *)SendMsg->IO.CitContext)->cs_host));
 489
 490                 syslog(LOG_DEBUG, "SMTP Starting: [%ld] <%s> CC <%d> \n",
 491                        SendMsg->MyQItem->MessageID,
 492                        ChrPtr(SendMsg->MyQEntry->Recipient),
 493                        ((CitContext*)SendMsg->IO.CitContext)->cs_pid);
 494                 if (SendMsg->pCurrRelay == NULL)
 495                         QueueEventContext(&SendMsg->IO,
 496                                           resolve_mx_records);
 497                 else { /* oh... via relay host */
 498                         if (SendMsg->pCurrRelay->IsIP) {
 499                                 QueueEventContext(&SendMsg->IO,
 500                                                   mx_connect_ip);
 501                         }
 502                         else { /* uneducated admin has chosen to add DNS to the equation... */
 503                                 QueueEventContext(&SendMsg->IO,
 504                                                   get_one_mx_host_ip);
 505                         }
 506                 }
 507         }
 508         else {
 509                 /* No recipients? well fail then. */
 510                 if ((SendMsg==NULL) ||
 511                     (SendMsg->MyQEntry == NULL)) {
 512                         SendMsg->MyQEntry->Status = 5;
 513                         StrBufPlain(SendMsg->MyQEntry->StatusMessage,
 514                                     HKEY("Invalid Recipient!"));
 515                 }
 516                 FinalizeMessageSend(SendMsg);
 517         }
 518 }
 519
 520
 521
 522
 523
 524
 525 /*****************************************************************************/
 526 /*                     SMTP CLIENT DISPATCHER                                */
 527 /*****************************************************************************/
 528
 529 void SMTPSetTimeout(eNextState NextTCPState, SmtpOutMsg *pMsg)
 530 {
 531         double Timeout = 0.0;
 532         AsyncIO *IO = &pMsg->IO;
 533
 534         EVS_syslog(LOG_DEBUG, "SMTP: %s\n", __FUNCTION__);
 535
 536         switch (NextTCPState) {
 537         case eSendFile:
 538         case eSendReply:
 539         case eSendMore:
 540                 Timeout = SMTP_C_SendTimeouts[pMsg->State];
 541                 if (pMsg->State == eDATABody) {
 542                         /* if we're sending a huge message, we need more time. */
 543                         Timeout += StrLength(pMsg->msgtext) / 1024;
 544                 }
 545                 break;
 546         case eReadMessage:
 547                 Timeout = SMTP_C_ReadTimeouts[pMsg->State];
 548                 if (pMsg->State == eDATATerminateBody) {
 549                         /*
 550                          * some mailservers take a nap before accepting the message
 551                          * content inspection and such.
 552                          */
 553                         Timeout += StrLength(pMsg->msgtext) / 1024;
 554                 }
 555                 break;
 556         case eSendDNSQuery:
 557         case eReadDNSReply:
 558         case eDBQuery:
 559         case eReadFile:
 560         case eReadMore:
 561         case eReadPayload:
 562         case eConnect:
 563         case eTerminateConnection:
 564         case eAbort:
 565                 return;
 566         }
 567         SetNextTimeout(&pMsg->IO, Timeout);
 568 }
 569 eNextState SMTP_C_DispatchReadDone(AsyncIO *IO)
 570 {
 571         EVS_syslog(LOG_DEBUG, "SMTP: %s\n", __FUNCTION__);
 572         SmtpOutMsg *pMsg = IO->Data;
 573         eNextState rc;
 574
 575         rc = ReadHandlers[pMsg->State](pMsg);
 576         if (rc != eAbort)
 577         {
 578                 pMsg->State++;
 579                 SMTPSetTimeout(rc, pMsg);
 580         }
 581         return rc;
 582 }
 583 eNextState SMTP_C_DispatchWriteDone(AsyncIO *IO)
 584 {
 585         EVS_syslog(LOG_DEBUG, "SMTP: %s\n", __FUNCTION__);
 586         SmtpOutMsg *pMsg = IO->Data;
 587         eNextState rc;
 588
 589         rc = SendHandlers[pMsg->State](pMsg);
 590         SMTPSetTimeout(rc, pMsg);
 591         return rc;
 592 }
 593
 594
 595 /*****************************************************************************/
 596 /*                     SMTP CLIENT ERROR CATCHERS                            */
 597 /*****************************************************************************/
 598 eNextState SMTP_C_Terminate(AsyncIO *IO)
 599 {
 600         SmtpOutMsg *pMsg = IO->Data;
 601
 602         EVS_syslog(LOG_DEBUG, "SMTP: %s\n", __FUNCTION__);
 603         FinalizeMessageSend(pMsg);
 604         return eAbort;
 605 }
 606 eNextState SMTP_C_Timeout(AsyncIO *IO)
 607 {
 608         SmtpOutMsg *pMsg = IO->Data;
 609
 610         EVS_syslog(LOG_DEBUG, "SMTP: %s\n", __FUNCTION__);
 611         StrBufPlain(IO->ErrMsg, CKEY(ReadErrors[pMsg->State]));
 612         return FailOneAttempt(IO);
 613 }
 614 eNextState SMTP_C_ConnFail(AsyncIO *IO)
 615 {
 616         SmtpOutMsg *pMsg = IO->Data;
 617
 618         EVS_syslog(LOG_DEBUG, "SMTP: %s\n", __FUNCTION__);
 619         StrBufPlain(IO->ErrMsg, CKEY(ReadErrors[pMsg->State]));
 620         return FailOneAttempt(IO);
 621 }
 622 eNextState SMTP_C_DNSFail(AsyncIO *IO)
 623 {
 624         EVS_syslog(LOG_DEBUG, "SMTP: %s\n", __FUNCTION__);
 625         return FailOneAttempt(IO);
 626 }
 627 eNextState SMTP_C_Shutdown(AsyncIO *IO)
 628 {
 629         EVS_syslog(LOG_DEBUG, "SMTP: %s\n", __FUNCTION__);
 630         SmtpOutMsg *pMsg = IO->Data;
 631
 632         pMsg->MyQEntry->Status = 3;
 633         StrBufPlain(pMsg->MyQEntry->StatusMessage, HKEY("server shutdown during message submit."));
 634         FinalizeMessageSend(pMsg);
 635         return eAbort;
 636 }
 637
 638
 639 /**
 640  * @brief lineread Handler; understands when to read more SMTP lines, and when this is a one-lined reply.
 641  */
 642 eReadState SMTP_C_ReadServerStatus(AsyncIO *IO)
 643 {
 644         eReadState Finished = eBufferNotEmpty;
 645
 646         while (Finished == eBufferNotEmpty) {
 647                 Finished = StrBufChunkSipLine(IO->IOBuf, &IO->RecvBuf);
 648
 649                 switch (Finished) {
 650                 case eMustReadMore: /// read new from socket...
 651                         return Finished;
 652                         break;
 653                 case eBufferNotEmpty: /* shouldn't happen... */
 654                 case eReadSuccess: /// done for now...
 655                         if (StrLength(IO->IOBuf) < 4)
 656                                 continue;
 657                         if (ChrPtr(IO->IOBuf)[3] == '-')
 658                                 Finished = eBufferNotEmpty;
 659                         else
 660                                 return Finished;
 661                         break;
 662                 case eReadFail: /// WHUT?
 663                         ///todo: shut down!
 664                         break;
 665                 }
 666         }
 667         return Finished;
 668 }
 669
 670 CTDL_MODULE_INIT(smtp_eventclient)
 671 {
 672         return "smtpeventclient";
 673 }