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