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 /******************************************************************************
 116  * So, we're finished with sending (regardless of success or failure)         *
 117  * This Message might be referenced by several Queue-Items, if we're the last,*
 118  * we need to free the memory and send bounce messages (on terminal failure)  *
 119  * else we just free our SMTP-Message struct.                                 *
 120  ******************************************************************************/
 121 void FinalizeMessageSend(SmtpOutMsg *Msg)
 122 {
 123         CtdlLogPrintf(CTDL_DEBUG, "SMTP: %s\n", __FUNCTION__);
 124
 125         if (DecreaseQReference(Msg->MyQItem))
 126         {
 127                 int nRemain;
 128                 StrBuf *MsgData;
 129
 130                 nRemain = CountActiveQueueEntries(Msg->MyQItem);
 131
 132                 MsgData = SerializeQueueItem(Msg->MyQItem);
 133                 /*
 134                  * Uncompleted delivery instructions remain, so delete the old
 135                  * instructions and replace with the updated ones.
 136                  */
 137                 CtdlDeleteMessages(SMTP_SPOOLOUT_ROOM, &Msg->MyQItem->QueMsgID, 1, "");
 138                 smtpq_do_bounce(Msg->MyQItem,
 139                                 Msg->msgtext);
 140                 if (nRemain > 0) {
 141                         struct CtdlMessage *msg;
 142                         msg = malloc(sizeof(struct CtdlMessage));
 143                         memset(msg, 0, sizeof(struct CtdlMessage));
 144                         msg->cm_magic = CTDLMESSAGE_MAGIC;
 145                         msg->cm_anon_type = MES_NORMAL;
 146                         msg->cm_format_type = FMT_RFC822;
 147                         msg->cm_fields['M'] = SmashStrBuf(&MsgData);
 148                         CtdlSubmitMsg(msg, NULL, SMTP_SPOOLOUT_ROOM, QP_EADDR);
 149                         CtdlFreeMessage(msg);
 150                 }
 151                 else {
 152                         CtdlDeleteMessages(SMTP_SPOOLOUT_ROOM, &Msg->MyQItem->MessageID, 1, "");
 153                         FreeStrBuf(&MsgData);
 154                 }
 155
 156                 RemoveQItem(Msg->MyQItem);
 157         }
 158         DeleteSmtpOutMsg(Msg);
 159 }
 160
 161 eNextState FailOneAttempt(AsyncIO *IO)
 162 {
 163         /*
 164          * possible ways here:
 165          * - connection timeout
 166          * -
 167          */
 168 }
 169
 170 ////TODO
 171
 172
 173 void SetConnectStatus(AsyncIO *IO)
 174 {
 175
 176         SmtpOutMsg *SendMsg = IO->Data;
 177         char buf[256];
 178         void *src;
 179
 180         buf[0] = '\0';
 181
 182         if (IO->IP6) {
 183                 src = &IO->Addr.sin6_addr;
 184         }
 185         else {
 186                 struct sockaddr_in *addr = (struct sockaddr_in *)&IO->Addr;
 187
 188                 src = &addr->sin_addr.s_addr;
 189         }
 190
 191         inet_ntop((IO->IP6)?AF_INET6:AF_INET,
 192                   src,
 193                   buf, sizeof(buf));
 194         if (SendMsg->mx_host == NULL)
 195                 SendMsg->mx_host = "<no name>";
 196
 197         CtdlLogPrintf(CTDL_DEBUG,
 198                       "SMTP client[%ld]: connecting to %s [%s]:%d ...\n",
 199                       SendMsg->n,
 200                       SendMsg->mx_host,
 201                       buf,
 202                       SendMsg->IO.dport);
 203
 204         SendMsg->MyQEntry->Status = 5;
 205         StrBufPrintf(SendMsg->MyQEntry->StatusMessage,
 206                      "Timeout while connecting %s [%s]:%d ",
 207                      SendMsg->mx_host,
 208                      buf,
 209                      SendMsg->IO.dport);
 210 }
 211
 212 /*****************************************************************************
 213  * So we connect our Relay IP here.                                          *
 214  *****************************************************************************/
 215 eNextState mx_connect_relay_ip(AsyncIO *IO)
 216 {
 217
 218         SmtpOutMsg *SendMsg = IO->Data;
 219
 220         CtdlLogPrintf(CTDL_DEBUG, "SMTP: %s\n", __FUNCTION__);
 221
 222         IO->IP6 = SendMsg->pCurrRelay->af == AF_INET6;
 223
 224         if (SendMsg->pCurrRelay->Port != 0)
 225                 IO->dport = SendMsg->pCurrRelay->Port;
 226
 227         memset(&IO->Addr, 0, sizeof(struct sockaddr_in6));
 228         if (IO->IP6) {
 229                 memcpy(&IO->Addr.sin6_addr.s6_addr,
 230                        &SendMsg->pCurrRelay->Addr,
 231                        sizeof(struct in6_addr));
 232
 233                 IO->Addr.sin6_family = AF_INET6;
 234                 IO->Addr.sin6_port   = htons(IO->dport);
 235         }
 236         else {
 237                 struct sockaddr_in *addr = (struct sockaddr_in*) &IO->Addr;
 238                 /* Bypass the ns lookup result like this: IO->Addr.sin_addr.s_addr = inet_addr("127.0.0.1"); */
 239                 memcpy(&addr->sin_addr,///.s_addr,
 240                        &SendMsg->pCurrRelay->Addr,
 241                        sizeof(struct in_addr));
 242
 243                 addr->sin_family = AF_INET;
 244                 addr->sin_port   = htons(IO->dport);
 245         }
 246
 247         SetConnectStatus(IO);
 248
 249         return InitEventIO(IO, SendMsg,
 250                            SMTP_C_ConnTimeout,
 251                            SMTP_C_ReadTimeouts[0],
 252                            1);
 253 }
 254
 255 eNextState get_one_mx_host_ip_done(AsyncIO *IO)
 256 {
 257         SmtpOutMsg *SendMsg = IO->Data;
 258         struct hostent *hostent;
 259
 260         QueryCbDone(IO);
 261
 262         hostent = SendMsg->HostLookup.VParsedDNSReply;
 263         if ((SendMsg->HostLookup.DNSStatus == ARES_SUCCESS) &&
 264             (hostent != NULL) ) {
 265
 266                 IO->IP6  = hostent->h_addrtype == AF_INET6;
 267                 ////IO->HEnt = hostent;
 268
 269                 memset(&IO->Addr, 0, sizeof(struct in6_addr));
 270                 if (IO->IP6) {
 271                         memcpy(&IO->Addr.sin6_addr.s6_addr,
 272                                &hostent->h_addr_list[0],
 273                                sizeof(struct in6_addr));
 274
 275                         IO->Addr.sin6_family = hostent->h_addrtype;
 276                         IO->Addr.sin6_port   = htons(IO->dport);
 277                 }
 278                 else {
 279                         struct sockaddr_in *addr = (struct sockaddr_in*) &IO->Addr;
 280                         /* Bypass the ns lookup result like this: IO->Addr.sin_addr.s_addr = inet_addr("127.0.0.1"); */
 281 //                      addr->sin_addr.s_addr = htonl((uint32_t)&hostent->h_addr_list[0]);
 282                         memcpy(&addr->sin_addr.s_addr,
 283                                hostent->h_addr_list[0],
 284                                sizeof(uint32_t));
 285
 286                         addr->sin_family = hostent->h_addrtype;
 287                         addr->sin_port   = htons(IO->dport);
 288
 289                 }
 290                 ////SendMsg->IO.HEnt = hostent;
 291                 SetConnectStatus(IO);
 292                 return InitEventIO(IO,
 293                                    SendMsg,
 294                                    SMTP_C_ConnTimeout,
 295                                    SMTP_C_ReadTimeouts[0],
 296                                    1);
 297         }
 298         else // TODO: here we need to find out whether there are more mx'es, backup relay, and so on
 299                 return SMTP_C_Terminate(IO);
 300 }
 301
 302 /*
 303
 304         if (SendMsg->pCurrRelay != NULL) {
 305                 SendMsg->mx_host = Hostname = SendMsg->pCurrRelay->Host;
 306                 if (SendMsg->pCurrRelay->Port != 0)
 307                         SendMsg->IO.dport = SendMsg->pCurrRelay->Port;
 308         }
 309         else
 310 */
 311 eNextState get_one_mx_host_ip(AsyncIO *IO)
 312 {
 313         SmtpOutMsg * SendMsg = IO->Data;
 314         const char *Hostname;
 315         //char *endpart;
 316         //char buf[SIZ];
 317
 318         /*
 319          * here we start with the lookup of one host. it might be...
 320          * - the relay host *sigh*
 321          * - the direct hostname if there was no mx record
 322          * - one of the mx'es
 323          */
 324
 325         InitC_ares_dns(IO);
 326
 327         if (SendMsg->mx_host != NULL) Hostname = SendMsg->mx_host;
 328         else Hostname = SendMsg->node;
 329
 330         CtdlLogPrintf(CTDL_DEBUG, "SMTP: %s\n", __FUNCTION__);
 331
 332         CtdlLogPrintf(CTDL_DEBUG,
 333                       "SMTP client[%ld]: looking up %s : %d ...\n",
 334                       SendMsg->n,
 335                       Hostname,
 336                       SendMsg->IO.dport);
 337 // TODO: ns_t_aaaa
 338         if (!QueueQuery(ns_t_a,
 339                         Hostname,
 340                         &SendMsg->IO,
 341                         &SendMsg->HostLookup,
 342                         get_one_mx_host_ip_done))
 343         {
 344                 SendMsg->MyQEntry->Status = 5;
 345                 StrBufPrintf(SendMsg->MyQEntry->StatusMessage,
 346                              "No MX hosts found for <%s>", SendMsg->node);
 347                 return IO->NextState;
 348         }
 349         return IO->NextState;
 350 }
 351
 352
 353 /*****************************************************************************
 354  * here we try to find out about the MX records for our recipients.          *
 355  *****************************************************************************/
 356 eNextState smtp_resolve_mx_record_done(AsyncIO *IO)
 357 {
 358         SmtpOutMsg * SendMsg = IO->Data;
 359         ParsedURL **pp;
 360
 361         QueryCbDone(IO);
 362
 363         CtdlLogPrintf(CTDL_DEBUG, "SMTP: %s\n", __FUNCTION__);
 364         pp = &SendMsg->Relay;
 365         while ((pp != NULL) && (*pp != NULL) && ((*pp)->Next != NULL))
 366                 pp = &(*pp)->Next;
 367
 368         if ((IO->DNSQuery->DNSStatus == ARES_SUCCESS) &&
 369             (IO->DNSQuery->VParsedDNSReply != NULL))
 370         { /* ok, we found mx records. */
 371                 SendMsg->IO.ErrMsg = SendMsg->MyQEntry->StatusMessage;
 372
 373
 374                 SendMsg->CurrMX    = SendMsg->AllMX
 375                                    = IO->DNSQuery->VParsedDNSReply;
 376                 while (SendMsg->CurrMX) {
 377                         int i;
 378                         for (i = 0; i < 2; i++) {
 379                                 ParsedURL *p;
 380
 381                                 p = (ParsedURL*) malloc(sizeof(ParsedURL));
 382                                 memset(p, 0, sizeof(ParsedURL));
 383                                 p->IsIP = 0;
 384                                 p->Port = 25; //// TODO define.
 385                                 p->IPv6 = i == 1;
 386                                 p->Host = SendMsg->CurrMX->host;
 387
 388                                 *pp = p;
 389                                 pp = &p;
 390                         }
 391                         SendMsg->CurrMX    = SendMsg->CurrMX->next;
 392                 }
 393 //              SendMsg->mx_host   = SendMsg->CurrMX->host;
 394 //              SendMsg->CurrMX    = SendMsg->CurrMX->next;
 395                 SendMsg->CXFlags   = SendMsg->CXFlags & F_HAVE_MX;
 396         }
 397         else { /* else fall back to the plain hostname */
 398                 int i;
 399                 for (i = 0; i < 2; i++) {
 400                         ParsedURL *p;
 401
 402                         p = (ParsedURL*) malloc(sizeof(ParsedURL));
 403                         memset(p, 0, sizeof(ParsedURL));
 404                         p->IsIP = 0;
 405                         p->Port = 25; //// TODO define.
 406                         p->IPv6 = i == 1;
 407                         p->Host = SendMsg->node;
 408
 409                         *pp = p;
 410                         pp = &p;
 411                 }
 412                 ///     SendMsg->mx_host   = SendMsg->node;
 413                 SendMsg->CXFlags   = SendMsg->CXFlags & F_DIRECT;
 414         }
 415         (*pp)->Next = SendMsg->MyQItem->FallBackHost;
 416         return get_one_mx_host_ip(IO);
 417 }
 418
 419 eNextState resolve_mx_records(AsyncIO *IO)
 420 {
 421         SmtpOutMsg * SendMsg = IO->Data;
 422
 423         CtdlLogPrintf(CTDL_DEBUG, "SMTP: %s\n", __FUNCTION__);
 424         /* start resolving MX records here. */
 425         if (!QueueQuery(ns_t_mx,
 426                         SendMsg->node,
 427                         &SendMsg->IO,
 428                         &SendMsg->MxLookup,
 429                         smtp_resolve_mx_record_done))
 430         {
 431                 SendMsg->MyQEntry->Status = 5;
 432                 StrBufPrintf(SendMsg->MyQEntry->StatusMessage,
 433                              "No MX hosts found for <%s>", SendMsg->node);
 434                 return IO->NextState;
 435         }
 436         return eAbort;
 437 }
 438
 439
 440
 441 /******************************************************************************
 442  *  so, we're going to start a SMTP delivery.  lets get it on.                *
 443  ******************************************************************************/
 444
 445 SmtpOutMsg *new_smtp_outmsg(OneQueItem *MyQItem,
 446                             MailQEntry *MyQEntry,
 447                             int MsgCount)
 448 {
 449         SmtpOutMsg * SendMsg;
 450
 451         SendMsg = (SmtpOutMsg *) malloc(sizeof(SmtpOutMsg));
 452         memset(SendMsg, 0, sizeof(SmtpOutMsg));
 453
 454         SendMsg->n                = MsgCount;
 455         SendMsg->MyQEntry         = MyQEntry;
 456         SendMsg->MyQItem          = MyQItem;
 457         SendMsg->pCurrRelay       = MyQItem->URL;
 458
 459         SendMsg->IO.Data          = SendMsg;
 460
 461         SendMsg->IO.SendDone      = SMTP_C_DispatchWriteDone;
 462         SendMsg->IO.ReadDone      = SMTP_C_DispatchReadDone;
 463         SendMsg->IO.Terminate     = SMTP_C_Terminate;
 464         SendMsg->IO.LineReader    = SMTP_C_ReadServerStatus;
 465         SendMsg->IO.ConnFail      = SMTP_C_ConnFail;
 466         SendMsg->IO.Timeout       = SMTP_C_Timeout;
 467         SendMsg->IO.ShutdownAbort = SMTP_C_Shutdown;
 468
 469         SendMsg->IO.SendBuf.Buf   = NewStrBufPlain(NULL, 1024);
 470         SendMsg->IO.RecvBuf.Buf   = NewStrBufPlain(NULL, 1024);
 471         SendMsg->IO.IOBuf         = NewStrBuf();
 472
 473         SendMsg->IO.sock          = (-1);
 474         SendMsg->IO.NextState     = eReadMessage;
 475         SendMsg->IO.dport         = DefaultMXPort;
 476
 477         return SendMsg;
 478 }
 479
 480 void smtp_try_one_queue_entry(OneQueItem *MyQItem,
 481                               MailQEntry *MyQEntry,
 482                               StrBuf *MsgText,
 483                               int KeepMsgText,  /* KeepMsgText allows us to use MsgText as ours. */
 484                               int MsgCount)
 485 {
 486         SmtpOutMsg *SendMsg;
 487
 488         CtdlLogPrintf(CTDL_DEBUG, "SMTP: %s\n", __FUNCTION__);
 489
 490         SendMsg = new_smtp_outmsg(MyQItem, MyQEntry, MsgCount);
 491         if (KeepMsgText) SendMsg->msgtext = MsgText;
 492         else             SendMsg->msgtext = NewStrBufDup(MsgText);
 493
 494         if (smtp_resolve_recipients(SendMsg)) {
 495                 if (SendMsg->pCurrRelay == NULL)
 496                         QueueEventContext(&SendMsg->IO,
 497                                           resolve_mx_records);
 498                 else { /* oh... via relay host */
 499                         if (SendMsg->pCurrRelay->IsIP) {
 500                                 QueueEventContext(&SendMsg->IO,
 501                                                   mx_connect_relay_ip);
 502                         }
 503                         else { /* uneducated admin has chosen to add DNS to the equation... */
 504                                 QueueEventContext(&SendMsg->IO,
 505                                                   get_one_mx_host_ip);
 506                         }
 507                 }
 508         }
 509         else {
 510                 /* No recipients? well fail then. */
 511                 if ((SendMsg==NULL) ||
 512                     (SendMsg->MyQEntry == NULL)) {
 513                         SendMsg->MyQEntry->Status = 5;
 514                         StrBufPlain(SendMsg->MyQEntry->StatusMessage,
 515                                     HKEY("Invalid Recipient!"));
 516                 }
 517                 FinalizeMessageSend(SendMsg);
 518         }
 519 }
 520
 521
 522
 523
 524
 525
 526 /*****************************************************************************/
 527 /*                     SMTP CLIENT DISPATCHER                                */
 528 /*****************************************************************************/
 529
 530 void SMTPSetTimeout(eNextState NextTCPState, SmtpOutMsg *pMsg)
 531 {
 532         CtdlLogPrintf(CTDL_DEBUG, "SMTP: %s\n", __FUNCTION__);
 533         double Timeout;
 534         switch (NextTCPState) {
 535         case eSendReply:
 536         case eSendMore:
 537                 Timeout = SMTP_C_SendTimeouts[pMsg->State];
 538                 if (pMsg->State == eDATABody) {
 539                         /* if we're sending a huge message, we need more time. */
 540                         Timeout += StrLength(pMsg->msgtext) / 1024;
 541                 }
 542                 break;
 543         case eReadMessage:
 544                 Timeout = SMTP_C_ReadTimeouts[pMsg->State];
 545                 if (pMsg->State == eDATATerminateBody) {
 546                         /*
 547                          * some mailservers take a nap before accepting the message
 548                          * content inspection and such.
 549                          */
 550                         Timeout += StrLength(pMsg->msgtext) / 1024;
 551                 }
 552                 break;
 553         case eTerminateConnection:
 554         case eAbort:
 555                 return;
 556         }
 557         SetNextTimeout(&pMsg->IO, Timeout);
 558 }
 559 eNextState SMTP_C_DispatchReadDone(AsyncIO *IO)
 560 {
 561         CtdlLogPrintf(CTDL_DEBUG, "SMTP: %s\n", __FUNCTION__);
 562         SmtpOutMsg *pMsg = IO->Data;
 563         eNextState rc;
 564
 565         rc = ReadHandlers[pMsg->State](pMsg);
 566         pMsg->State++;
 567         SMTPSetTimeout(rc, pMsg);
 568         return rc;
 569 }
 570 eNextState SMTP_C_DispatchWriteDone(AsyncIO *IO)
 571 {
 572         CtdlLogPrintf(CTDL_DEBUG, "SMTP: %s\n", __FUNCTION__);
 573         SmtpOutMsg *pMsg = IO->Data;
 574         eNextState rc;
 575
 576         rc = SendHandlers[pMsg->State](pMsg);
 577         SMTPSetTimeout(rc, pMsg);
 578         return rc;
 579 }
 580
 581
 582 /*****************************************************************************/
 583 /*                     SMTP CLIENT ERROR CATCHERS                            */
 584 /*****************************************************************************/
 585 eNextState SMTP_C_Terminate(AsyncIO *IO)
 586 {
 587         SmtpOutMsg *pMsg = IO->Data;
 588
 589         CtdlLogPrintf(CTDL_DEBUG, "SMTP: %s\n", __FUNCTION__);
 590         FinalizeMessageSend(pMsg);
 591         return eAbort;
 592 }
 593 eNextState SMTP_C_Timeout(AsyncIO *IO)
 594 {
 595         SmtpOutMsg *pMsg = IO->Data;
 596
 597         CtdlLogPrintf(CTDL_DEBUG, "SMTP: %s\n", __FUNCTION__);
 598         StrBufPlain(IO->ErrMsg, CKEY(ReadErrors[pMsg->State]));
 599         return FailOneAttempt(IO);
 600 }
 601 eNextState SMTP_C_ConnFail(AsyncIO *IO)
 602 {
 603         SmtpOutMsg *pMsg = IO->Data;
 604
 605         CtdlLogPrintf(CTDL_DEBUG, "SMTP: %s\n", __FUNCTION__);
 606         StrBufPlain(IO->ErrMsg, CKEY(ReadErrors[pMsg->State]));
 607         return FailOneAttempt(IO);
 608 }
 609 eNextState SMTP_C_Shutdown(AsyncIO *IO)
 610 {
 611         CtdlLogPrintf(CTDL_DEBUG, "SMTP: %s\n", __FUNCTION__);
 612         SmtpOutMsg *pMsg = IO->Data;
 613
 614         pMsg->MyQEntry->Status = 3;
 615         StrBufPlain(pMsg->MyQEntry->StatusMessage, HKEY("server shutdown during message submit."));
 616         FinalizeMessageSend(pMsg);
 617         return eAbort;
 618 }
 619
 620
 621 /**
 622  * @brief lineread Handler; understands when to read more SMTP lines, and when this is a one-lined reply.
 623  */
 624 eReadState SMTP_C_ReadServerStatus(AsyncIO *IO)
 625 {
 626         eReadState Finished = eBufferNotEmpty;
 627
 628         while (Finished == eBufferNotEmpty) {
 629                 Finished = StrBufChunkSipLine(IO->IOBuf, &IO->RecvBuf);
 630
 631                 switch (Finished) {
 632                 case eMustReadMore: /// read new from socket...
 633                         return Finished;
 634                         break;
 635                 case eBufferNotEmpty: /* shouldn't happen... */
 636                 case eReadSuccess: /// done for now...
 637                         if (StrLength(IO->IOBuf) < 4)
 638                                 continue;
 639                         if (ChrPtr(IO->IOBuf)[3] == '-')
 640                                 Finished = eBufferNotEmpty;
 641                         else
 642                                 return Finished;
 643                         break;
 644                 case eReadFail: /// WHUT?
 645                         ///todo: shut down!
 646                         break;
 647                 }
 648         }
 649         return Finished;
 650 }
 651
 652 #endif
 653 CTDL_MODULE_INIT(smtp_eventclient)
 654 {
 655         return "smtpeventclient";
 656 }