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