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