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 #ifdef EXPERIMENTAL_SMTP_EVENT_CLIENT
  94 const unsigned short DefaultMXPort = 25;
  95 void DeleteSmtpOutMsg(void *v)
  96 {
  97         SmtpOutMsg *Msg = v;
  98
  99         ares_free_data(Msg->AllMX);
 100         if (Msg->HostLookup.VParsedDNSReply != NULL)
 101                 Msg->HostLookup.DNSReplyFree(Msg->HostLookup.VParsedDNSReply);
 102         FreeStrBuf(&Msg->msgtext);
 103         FreeAsyncIOContents(&Msg->IO);
 104         free(Msg);
 105 }
 106
 107 eNextState SMTP_C_Shutdown(AsyncIO *IO);
 108 eNextState SMTP_C_Timeout(AsyncIO *IO);
 109 eNextState SMTP_C_ConnFail(AsyncIO *IO);
 110 eNextState SMTP_C_DispatchReadDone(AsyncIO *IO);
 111 eNextState SMTP_C_DispatchWriteDone(AsyncIO *IO);
 112 eNextState SMTP_C_Terminate(AsyncIO *IO);
 113 eReadState SMTP_C_ReadServerStatus(AsyncIO *IO);
 114
 115 eNextState mx_connect_ip(AsyncIO *IO);
 116 eNextState get_one_mx_host_ip(AsyncIO *IO);
 117
 118 /******************************************************************************
 119  * So, we're finished with sending (regardless of success or failure)         *
 120  * This Message might be referenced by several Queue-Items, if we're the last,*
 121  * we need to free the memory and send bounce messages (on terminal failure)  *
 122  * else we just free our SMTP-Message struct.                                 *
 123  ******************************************************************************/
 124 void FinalizeMessageSend(SmtpOutMsg *Msg)
 125 {
 126         CtdlLogPrintf(CTDL_DEBUG, "SMTP: %s\n", __FUNCTION__);
 127
 128         if (DecreaseQReference(Msg->MyQItem))
 129         {
 130                 int nRemain;
 131                 StrBuf *MsgData;
 132
 133                 nRemain = CountActiveQueueEntries(Msg->MyQItem);
 134
 135                 MsgData = SerializeQueueItem(Msg->MyQItem);
 136                 /*
 137                  * Uncompleted delivery instructions remain, so delete the old
 138                  * instructions and replace with the updated ones.
 139                  */
 140                 CtdlDeleteMessages(SMTP_SPOOLOUT_ROOM, &Msg->MyQItem->QueMsgID, 1, "");
 141                 smtpq_do_bounce(Msg->MyQItem,
 142                                 Msg->msgtext);
 143                 if (nRemain > 0) {
 144                         struct CtdlMessage *msg;
 145                         msg = malloc(sizeof(struct CtdlMessage));
 146                         memset(msg, 0, sizeof(struct CtdlMessage));
 147                         msg->cm_magic = CTDLMESSAGE_MAGIC;
 148                         msg->cm_anon_type = MES_NORMAL;
 149                         msg->cm_format_type = FMT_RFC822;
 150                         msg->cm_fields['M'] = SmashStrBuf(&MsgData);
 151                         CtdlSubmitMsg(msg, NULL, SMTP_SPOOLOUT_ROOM, QP_EADDR);
 152                         CtdlFreeMessage(msg);
 153                 }
 154                 else {
 155                         CtdlDeleteMessages(SMTP_SPOOLOUT_ROOM, &Msg->MyQItem->MessageID, 1, "");
 156                         FreeStrBuf(&MsgData);
 157                 }
 158
 159                 RemoveQItem(Msg->MyQItem);
 160         }
 161
 162         RemoveContext(Msg->IO.CitContext);
 163         DeleteSmtpOutMsg(Msg);
 164 }
 165
 166 eNextState FailOneAttempt(AsyncIO *IO)
 167 {
 168         SmtpOutMsg *SendMsg = IO->Data;
 169         /*
 170          * possible ways here:
 171          * - connection timeout
 172          * -
 173          */
 174         SendMsg->pCurrRelay = SendMsg->pCurrRelay->Next;
 175
 176         if (SendMsg->pCurrRelay == NULL)
 177                 return eAbort;
 178         if (SendMsg->pCurrRelay->IsIP)
 179                 return mx_connect_ip(IO);
 180         else
 181                 return get_one_mx_host_ip(IO);
 182 }
 183
 184
 185 void SetConnectStatus(AsyncIO *IO)
 186 {
 187
 188         SmtpOutMsg *SendMsg = IO->Data;
 189         char buf[256];
 190         void *src;
 191
 192         buf[0] = '\0';
 193
 194         if (IO->ConnectMe->IPv6) {
 195                 src = &IO->ConnectMe->Addr.sin6_addr;
 196         }
 197         else {
 198                 struct sockaddr_in *addr = (struct sockaddr_in *)&IO->ConnectMe->Addr;
 199
 200                 src = &addr->sin_addr.s_addr;
 201         }
 202
 203         inet_ntop((IO->ConnectMe->IPv6)?AF_INET6:AF_INET,
 204                   src,
 205                   buf,
 206                   sizeof(buf));
 207
 208         if (SendMsg->mx_host == NULL)
 209                 SendMsg->mx_host = "<no name>";
 210
 211         CtdlLogPrintf(CTDL_DEBUG,
 212                       "SMTP client[%ld]: connecting to %s [%s]:%d ...\n",
 213                       SendMsg->n,
 214                       SendMsg->mx_host,
 215                       buf,
 216                       SendMsg->IO.ConnectMe->Port);
 217
 218         SendMsg->MyQEntry->Status = 5;
 219         StrBufPrintf(SendMsg->MyQEntry->StatusMessage,
 220                      "Timeout while connecting %s [%s]:%d ",
 221                      SendMsg->mx_host,
 222                      buf,
 223                      SendMsg->IO.ConnectMe->Port);
 224 }
 225
 226 /*****************************************************************************
 227  * So we connect our Relay IP here.                                          *
 228  *****************************************************************************/
 229 eNextState mx_connect_ip(AsyncIO *IO)
 230 {
 231         SmtpOutMsg *SendMsg = IO->Data;
 232
 233         CtdlLogPrintf(CTDL_DEBUG, "SMTP: %s\n", __FUNCTION__);
 234
 235         IO->ConnectMe = SendMsg->pCurrRelay;
 236         /*  Bypass the ns lookup result like this: IO->Addr.sin_addr.s_addr = inet_addr("127.0.0.1"); */
 237
 238         SetConnectStatus(IO);
 239
 240         return InitEventIO(IO, SendMsg,
 241                            SMTP_C_ConnTimeout,
 242                            SMTP_C_ReadTimeouts[0],
 243                            1);
 244 }
 245
 246 eNextState get_one_mx_host_ip_done(AsyncIO *IO)
 247 {
 248         SmtpOutMsg *SendMsg = IO->Data;
 249         struct hostent *hostent;
 250
 251         QueryCbDone(IO);
 252
 253         hostent = SendMsg->HostLookup.VParsedDNSReply;
 254         if ((SendMsg->HostLookup.DNSStatus == ARES_SUCCESS) &&
 255             (hostent != NULL) ) {
 256                 memset(&SendMsg->pCurrRelay->Addr, 0, sizeof(struct in6_addr));
 257                 if (SendMsg->pCurrRelay->IPv6) {
 258                         memcpy(&SendMsg->pCurrRelay->Addr.sin6_addr.s6_addr,
 259                                &hostent->h_addr_list[0],
 260                                sizeof(struct in6_addr));
 261
 262                         SendMsg->pCurrRelay->Addr.sin6_family = hostent->h_addrtype;
 263                         SendMsg->pCurrRelay->Addr.sin6_port   = htons(DefaultMXPort);
 264                 }
 265                 else {
 266                         struct sockaddr_in *addr = (struct sockaddr_in*) &SendMsg->pCurrRelay->Addr;
 267                         /* Bypass the ns lookup result like this: IO->Addr.sin_addr.s_addr = inet_addr("127.0.0.1"); */
 268 //                      addr->sin_addr.s_addr = htonl((uint32_t)&hostent->h_addr_list[0]);
 269                         memcpy(&addr->sin_addr.s_addr,
 270                                hostent->h_addr_list[0],
 271                                sizeof(uint32_t));
 272
 273                         addr->sin_family = hostent->h_addrtype;
 274                         addr->sin_port   = htons(DefaultMXPort);
 275
 276                 }
 277                 return mx_connect_ip(IO);
 278         }
 279         else // TODO: here we need to find out whether there are more mx'es, backup relay, and so on
 280                 return FailOneAttempt(IO);
 281 }
 282
 283 eNextState get_one_mx_host_ip(AsyncIO *IO)
 284 {
 285         SmtpOutMsg * SendMsg = IO->Data;
 286         /*
 287          * here we start with the lookup of one host. it might be...
 288          * - the relay host *sigh*
 289          * - the direct hostname if there was no mx record
 290          * - one of the mx'es
 291          */
 292
 293         InitC_ares_dns(IO);
 294
 295         CtdlLogPrintf(CTDL_DEBUG, "SMTP: %s\n", __FUNCTION__);
 296
 297         CtdlLogPrintf(CTDL_DEBUG,
 298                       "SMTP client[%ld]: looking up %s : %d ...\n",
 299                       SendMsg->n,
 300                       SendMsg->pCurrRelay->Host,
 301                       SendMsg->pCurrRelay->Port);
 302
 303         if (!QueueQuery((SendMsg->pCurrRelay->IPv6)? ns_t_aaaa : ns_t_a,
 304                         SendMsg->pCurrRelay->Host,
 305                         &SendMsg->IO,
 306                         &SendMsg->HostLookup,
 307                         get_one_mx_host_ip_done))
 308         {
 309                 SendMsg->MyQEntry->Status = 5;
 310                 StrBufPrintf(SendMsg->MyQEntry->StatusMessage,
 311                              "No MX hosts found for <%s>", SendMsg->node);
 312                 return IO->NextState;
 313         }
 314         return IO->NextState;
 315 }
 316
 317
 318 /*****************************************************************************
 319  * here we try to find out about the MX records for our recipients.          *
 320  *****************************************************************************/
 321 eNextState smtp_resolve_mx_record_done(AsyncIO *IO)
 322 {
 323         SmtpOutMsg * SendMsg = IO->Data;
 324         ParsedURL **pp;
 325
 326         QueryCbDone(IO);
 327
 328         CtdlLogPrintf(CTDL_DEBUG, "SMTP: %s\n", __FUNCTION__);
 329         pp = &SendMsg->Relay;
 330         while ((pp != NULL) && (*pp != NULL) && ((*pp)->Next != NULL))
 331                 pp = &(*pp)->Next;
 332
 333         if ((IO->DNSQuery->DNSStatus == ARES_SUCCESS) &&
 334             (IO->DNSQuery->VParsedDNSReply != NULL))
 335         { /* ok, we found mx records. */
 336                 SendMsg->IO.ErrMsg = SendMsg->MyQEntry->StatusMessage;
 337
 338                 SendMsg->CurrMX    = SendMsg->AllMX
 339                                    = IO->DNSQuery->VParsedDNSReply;
 340                 while (SendMsg->CurrMX) {
 341                         int i;
 342                         for (i = 0; i < 2; i++) {
 343                                 ParsedURL *p;
 344
 345                                 p = (ParsedURL*) malloc(sizeof(ParsedURL));
 346                                 memset(p, 0, sizeof(ParsedURL));
 347                                 p->IsIP = 0;
 348                                 p->Port = DefaultMXPort;
 349                                 p->IPv6 = i == 1;
 350                                 p->Host = SendMsg->CurrMX->host;
 351
 352                                 *pp = p;
 353                                 pp = &p->Next;
 354                         }
 355                         SendMsg->CurrMX    = SendMsg->CurrMX->next;
 356                 }
 357                 SendMsg->CXFlags   = SendMsg->CXFlags & F_HAVE_MX;
 358         }
 359         else { /* else fall back to the plain hostname */
 360                 int i;
 361                 for (i = 0; i < 2; i++) {
 362                         ParsedURL *p;
 363
 364                         p = (ParsedURL*) malloc(sizeof(ParsedURL));
 365                         memset(p, 0, sizeof(ParsedURL));
 366                         p->IsIP = 0;
 367                         p->Port = DefaultMXPort;
 368                         p->IPv6 = i == 1;
 369                         p->Host = SendMsg->node;
 370
 371                         *pp = p;
 372                         pp = &p;
 373                 }
 374                 SendMsg->CXFlags   = SendMsg->CXFlags & F_DIRECT;
 375         }
 376         *pp = SendMsg->MyQItem->FallBackHost;
 377         SendMsg->pCurrRelay = SendMsg->Relay;
 378         return get_one_mx_host_ip(IO);
 379 }
 380
 381 eNextState resolve_mx_records(AsyncIO *IO)
 382 {
 383         SmtpOutMsg * SendMsg = IO->Data;
 384
 385         CtdlLogPrintf(CTDL_DEBUG, "SMTP: %s\n", __FUNCTION__);
 386         /* start resolving MX records here. */
 387         if (!QueueQuery(ns_t_mx,
 388                         SendMsg->node,
 389                         &SendMsg->IO,
 390                         &SendMsg->MxLookup,
 391                         smtp_resolve_mx_record_done))
 392         {
 393                 SendMsg->MyQEntry->Status = 5;
 394                 StrBufPrintf(SendMsg->MyQEntry->StatusMessage,
 395                              "No MX hosts found for <%s>", SendMsg->node);
 396                 return IO->NextState;
 397         }
 398         return eAbort;
 399 }
 400
 401
 402
 403 /******************************************************************************
 404  *  so, we're going to start a SMTP delivery.  lets get it on.                *
 405  ******************************************************************************/
 406
 407 SmtpOutMsg *new_smtp_outmsg(OneQueItem *MyQItem,
 408                             MailQEntry *MyQEntry,
 409                             int MsgCount)
 410 {
 411         SmtpOutMsg * SendMsg;
 412
 413         SendMsg = (SmtpOutMsg *) malloc(sizeof(SmtpOutMsg));
 414         memset(SendMsg, 0, sizeof(SmtpOutMsg));
 415
 416         SendMsg->n                = MsgCount;
 417         SendMsg->MyQEntry         = MyQEntry;
 418         SendMsg->MyQItem          = MyQItem;
 419         SendMsg->pCurrRelay       = MyQItem->URL;
 420
 421         SendMsg->IO.Data          = SendMsg;
 422
 423         SendMsg->IO.SendDone      = SMTP_C_DispatchWriteDone;
 424         SendMsg->IO.ReadDone      = SMTP_C_DispatchReadDone;
 425         SendMsg->IO.Terminate     = SMTP_C_Terminate;
 426         SendMsg->IO.LineReader    = SMTP_C_ReadServerStatus;
 427         SendMsg->IO.ConnFail      = SMTP_C_ConnFail;
 428         SendMsg->IO.Timeout       = SMTP_C_Timeout;
 429         SendMsg->IO.ShutdownAbort = SMTP_C_Shutdown;
 430
 431         SendMsg->IO.SendBuf.Buf   = NewStrBufPlain(NULL, 1024);
 432         SendMsg->IO.RecvBuf.Buf   = NewStrBufPlain(NULL, 1024);
 433         SendMsg->IO.IOBuf         = NewStrBuf();
 434
 435         SendMsg->IO.NextState     = eReadMessage;
 436
 437         return SendMsg;
 438 }
 439
 440 void smtp_try_one_queue_entry(OneQueItem *MyQItem,
 441                               MailQEntry *MyQEntry,
 442                               StrBuf *MsgText,
 443                               int KeepMsgText,  /* KeepMsgText allows us to use MsgText as ours. */
 444                               int MsgCount)
 445 {
 446         SmtpOutMsg *SendMsg;
 447
 448         CtdlLogPrintf(CTDL_DEBUG, "SMTP: %s\n", __FUNCTION__);
 449
 450         SendMsg = new_smtp_outmsg(MyQItem, MyQEntry, MsgCount);
 451         if (KeepMsgText) SendMsg->msgtext = MsgText;
 452         else             SendMsg->msgtext = NewStrBufDup(MsgText);
 453
 454         if (smtp_resolve_recipients(SendMsg)) {
 455                 CitContext *SubC;
 456                 SubC = CloneContext (CC);
 457                 SubC->session_specific_data = (char*) SendMsg;
 458                 SendMsg->IO.CitContext = SubC;
 459
 460                 if (SendMsg->pCurrRelay == NULL)
 461                         QueueEventContext(&SendMsg->IO,
 462                                           resolve_mx_records);
 463                 else { /* oh... via relay host */
 464                         if (SendMsg->pCurrRelay->IsIP) {
 465                                 QueueEventContext(&SendMsg->IO,
 466                                                   mx_connect_ip);
 467                         }
 468                         else { /* uneducated admin has chosen to add DNS to the equation... */
 469                                 QueueEventContext(&SendMsg->IO,
 470                                                   get_one_mx_host_ip);
 471                         }
 472                 }
 473         }
 474         else {
 475                 /* No recipients? well fail then. */
 476                 if ((SendMsg==NULL) ||
 477                     (SendMsg->MyQEntry == NULL)) {
 478                         SendMsg->MyQEntry->Status = 5;
 479                         StrBufPlain(SendMsg->MyQEntry->StatusMessage,
 480                                     HKEY("Invalid Recipient!"));
 481                 }
 482                 FinalizeMessageSend(SendMsg);
 483         }
 484 }
 485
 486
 487
 488
 489
 490
 491 /*****************************************************************************/
 492 /*                     SMTP CLIENT DISPATCHER                                */
 493 /*****************************************************************************/
 494
 495 void SMTPSetTimeout(eNextState NextTCPState, SmtpOutMsg *pMsg)
 496 {
 497         CtdlLogPrintf(CTDL_DEBUG, "SMTP: %s\n", __FUNCTION__);
 498         double Timeout;
 499         switch (NextTCPState) {
 500         case eSendReply:
 501         case eSendMore:
 502                 Timeout = SMTP_C_SendTimeouts[pMsg->State];
 503                 if (pMsg->State == eDATABody) {
 504                         /* if we're sending a huge message, we need more time. */
 505                         Timeout += StrLength(pMsg->msgtext) / 1024;
 506                 }
 507                 break;
 508         case eReadMessage:
 509                 Timeout = SMTP_C_ReadTimeouts[pMsg->State];
 510                 if (pMsg->State == eDATATerminateBody) {
 511                         /*
 512                          * some mailservers take a nap before accepting the message
 513                          * content inspection and such.
 514                          */
 515                         Timeout += StrLength(pMsg->msgtext) / 1024;
 516                 }
 517                 break;
 518         case eTerminateConnection:
 519         case eAbort:
 520                 return;
 521         }
 522         SetNextTimeout(&pMsg->IO, Timeout);
 523 }
 524 eNextState SMTP_C_DispatchReadDone(AsyncIO *IO)
 525 {
 526         CtdlLogPrintf(CTDL_DEBUG, "SMTP: %s\n", __FUNCTION__);
 527         SmtpOutMsg *pMsg = IO->Data;
 528         eNextState rc;
 529
 530         rc = ReadHandlers[pMsg->State](pMsg);
 531         pMsg->State++;
 532         SMTPSetTimeout(rc, pMsg);
 533         return rc;
 534 }
 535 eNextState SMTP_C_DispatchWriteDone(AsyncIO *IO)
 536 {
 537         CtdlLogPrintf(CTDL_DEBUG, "SMTP: %s\n", __FUNCTION__);
 538         SmtpOutMsg *pMsg = IO->Data;
 539         eNextState rc;
 540
 541         rc = SendHandlers[pMsg->State](pMsg);
 542         SMTPSetTimeout(rc, pMsg);
 543         return rc;
 544 }
 545
 546
 547 /*****************************************************************************/
 548 /*                     SMTP CLIENT ERROR CATCHERS                            */
 549 /*****************************************************************************/
 550 eNextState SMTP_C_Terminate(AsyncIO *IO)
 551 {
 552         SmtpOutMsg *pMsg = IO->Data;
 553
 554         CtdlLogPrintf(CTDL_DEBUG, "SMTP: %s\n", __FUNCTION__);
 555         FinalizeMessageSend(pMsg);
 556         return eAbort;
 557 }
 558 eNextState SMTP_C_Timeout(AsyncIO *IO)
 559 {
 560         SmtpOutMsg *pMsg = IO->Data;
 561
 562         CtdlLogPrintf(CTDL_DEBUG, "SMTP: %s\n", __FUNCTION__);
 563         StrBufPlain(IO->ErrMsg, CKEY(ReadErrors[pMsg->State]));
 564         return FailOneAttempt(IO);
 565 }
 566 eNextState SMTP_C_ConnFail(AsyncIO *IO)
 567 {
 568         SmtpOutMsg *pMsg = IO->Data;
 569
 570         CtdlLogPrintf(CTDL_DEBUG, "SMTP: %s\n", __FUNCTION__);
 571         StrBufPlain(IO->ErrMsg, CKEY(ReadErrors[pMsg->State]));
 572         return FailOneAttempt(IO);
 573 }
 574 eNextState SMTP_C_Shutdown(AsyncIO *IO)
 575 {
 576         CtdlLogPrintf(CTDL_DEBUG, "SMTP: %s\n", __FUNCTION__);
 577         SmtpOutMsg *pMsg = IO->Data;
 578
 579         pMsg->MyQEntry->Status = 3;
 580         StrBufPlain(pMsg->MyQEntry->StatusMessage, HKEY("server shutdown during message submit."));
 581         FinalizeMessageSend(pMsg);
 582         return eAbort;
 583 }
 584
 585
 586 /**
 587  * @brief lineread Handler; understands when to read more SMTP lines, and when this is a one-lined reply.
 588  */
 589 eReadState SMTP_C_ReadServerStatus(AsyncIO *IO)
 590 {
 591         eReadState Finished = eBufferNotEmpty;
 592
 593         while (Finished == eBufferNotEmpty) {
 594                 Finished = StrBufChunkSipLine(IO->IOBuf, &IO->RecvBuf);
 595
 596                 switch (Finished) {
 597                 case eMustReadMore: /// read new from socket...
 598                         return Finished;
 599                         break;
 600                 case eBufferNotEmpty: /* shouldn't happen... */
 601                 case eReadSuccess: /// done for now...
 602                         if (StrLength(IO->IOBuf) < 4)
 603                                 continue;
 604                         if (ChrPtr(IO->IOBuf)[3] == '-')
 605                                 Finished = eBufferNotEmpty;
 606                         else
 607                                 return Finished;
 608                         break;
 609                 case eReadFail: /// WHUT?
 610                         ///todo: shut down!
 611                         break;
 612                 }
 613         }
 614         return Finished;
 615 }
 616
 617 #endif
 618 CTDL_MODULE_INIT(smtp_eventclient)
 619 {
 620         return "smtpeventclient";
 621 }