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         /* these are kept in our own space and free'd below */
  99         Msg->IO.ConnectMe = NULL;
 100
 101         ares_free_data(Msg->AllMX);
 102         if (Msg->HostLookup.VParsedDNSReply != NULL)
 103                 Msg->HostLookup.DNSReplyFree(Msg->HostLookup.VParsedDNSReply);
 104         FreeURL(&Msg->Relay);
 105         FreeStrBuf(&Msg->msgtext);
 106         FreeAsyncIOContents(&Msg->IO);
 107         memset (Msg, 0, sizeof(SmtpOutMsg)); /* just to be shure... */
 108         free(Msg);
 109 }
 110
 111 eNextState SMTP_C_Shutdown(AsyncIO *IO);
 112 eNextState SMTP_C_Timeout(AsyncIO *IO);
 113 eNextState SMTP_C_ConnFail(AsyncIO *IO);
 114 eNextState SMTP_C_DispatchReadDone(AsyncIO *IO);
 115 eNextState SMTP_C_DispatchWriteDone(AsyncIO *IO);
 116 eNextState SMTP_C_DNSFail(AsyncIO *IO);
 117 eNextState SMTP_C_Terminate(AsyncIO *IO);
 118 eReadState SMTP_C_ReadServerStatus(AsyncIO *IO);
 119
 120 eNextState mx_connect_ip(AsyncIO *IO);
 121 eNextState get_one_mx_host_ip(AsyncIO *IO);
 122
 123 /******************************************************************************
 124  * So, we're finished with sending (regardless of success or failure)         *
 125  * This Message might be referenced by several Queue-Items, if we're the last,*
 126  * we need to free the memory and send bounce messages (on terminal failure)  *
 127  * else we just free our SMTP-Message struct.                                 *
 128  ******************************************************************************/
 129 void FinalizeMessageSend(SmtpOutMsg *Msg)
 130 {
 131         int IDestructQueItem;
 132         int nRemain;
 133         StrBuf *MsgData;
 134         AsyncIO *IO = &Msg->IO;
 135
 136         IDestructQueItem = DecreaseQReference(Msg->MyQItem);
 137
 138         nRemain = CountActiveQueueEntries(Msg->MyQItem);
 139
 140         if ((nRemain > 0) || IDestructQueItem)
 141                 MsgData = SerializeQueueItem(Msg->MyQItem);
 142         else
 143                 MsgData = NULL;
 144
 145         /*
 146          * Uncompleted delivery instructions remain, so delete the old
 147          * instructions and replace with the updated ones.
 148          */
 149         EVS_syslog(LOG_DEBUG, "SMTPQD: %ld", Msg->MyQItem->QueMsgID);
 150         CtdlDeleteMessages(SMTP_SPOOLOUT_ROOM, &Msg->MyQItem->QueMsgID, 1, "");
 151
 152         if (IDestructQueItem)
 153                 smtpq_do_bounce(Msg->MyQItem,Msg->msgtext);
 154
 155         if (nRemain > 0)
 156         {
 157                 struct CtdlMessage *msg;
 158                 msg = malloc(sizeof(struct CtdlMessage));
 159                 memset(msg, 0, sizeof(struct CtdlMessage));
 160                 msg->cm_magic = CTDLMESSAGE_MAGIC;
 161                 msg->cm_anon_type = MES_NORMAL;
 162                 msg->cm_format_type = FMT_RFC822;
 163                 msg->cm_fields['M'] = SmashStrBuf(&MsgData);
 164                 Msg->MyQItem->QueMsgID =
 165                         CtdlSubmitMsg(msg, NULL, SMTP_SPOOLOUT_ROOM, QP_EADDR);
 166                 EVS_syslog(LOG_DEBUG, "SMTPQ: %ld", Msg->MyQItem->QueMsgID);
 167                 CtdlFreeMessage(msg);
 168         }
 169         else {
 170                 CtdlDeleteMessages(SMTP_SPOOLOUT_ROOM,
 171                                    &Msg->MyQItem->MessageID,
 172                                    1,
 173                                    "");
 174                 FreeStrBuf(&MsgData);
 175         }
 176         RemoveContext(Msg->IO.CitContext);
 177         if (IDestructQueItem)
 178                 RemoveQItem(Msg->MyQItem);
 179         DeleteSmtpOutMsg(Msg);
 180 }
 181
 182 eNextState FailOneAttempt(AsyncIO *IO)
 183 {
 184         SmtpOutMsg *SendMsg = IO->Data;
 185
 186         if (SendMsg->MyQEntry->Status == 2)
 187                 return eAbort;
 188
 189         /*
 190          * possible ways here:
 191          * - connection timeout
 192          * - dns lookup failed
 193          */
 194         StopClientWatchers(IO);
 195
 196         if (SendMsg->pCurrRelay != NULL)
 197                 SendMsg->pCurrRelay = SendMsg->pCurrRelay->Next;
 198
 199         if (SendMsg->pCurrRelay == NULL) {
 200                 EVS_syslog(LOG_DEBUG, "SMTP: %s Aborting\n", __FUNCTION__);
 201                 return eAbort;
 202         }
 203         if (SendMsg->pCurrRelay->IsIP) {
 204                 EVS_syslog(LOG_DEBUG, "SMTP: %s connecting IP\n", __FUNCTION__);
 205                 return mx_connect_ip(IO);
 206         }
 207         else {
 208                 EVS_syslog(LOG_DEBUG,
 209                            "SMTP: %s resolving next MX Record\n",
 210                            __FUNCTION__);
 211                 return get_one_mx_host_ip(IO);
 212         }
 213 }
 214
 215
 216 void SetConnectStatus(AsyncIO *IO)
 217 {
 218         SmtpOutMsg *SendMsg = IO->Data;
 219         char buf[256];
 220         void *src;
 221
 222         buf[0] = '\0';
 223
 224         if (IO->ConnectMe->IPv6) {
 225                 src = &IO->ConnectMe->Addr.sin6_addr;
 226         }
 227         else {
 228                 struct sockaddr_in *addr;
 229
 230                 addr = (struct sockaddr_in *)&IO->ConnectMe->Addr;
 231                 src = &addr->sin_addr.s_addr;
 232         }
 233
 234         inet_ntop((IO->ConnectMe->IPv6)?AF_INET6:AF_INET,
 235                   src,
 236                   buf,
 237                   sizeof(buf));
 238
 239         if (SendMsg->mx_host == NULL)
 240                 SendMsg->mx_host = "<no MX-Record>";
 241
 242         EVS_syslog(LOG_DEBUG,
 243                   "SMTP client[%ld]: connecting to %s [%s]:%d ...\n",
 244                   SendMsg->n,
 245                   SendMsg->mx_host,
 246                   buf,
 247                   SendMsg->IO.ConnectMe->Port);
 248
 249         SendMsg->MyQEntry->Status = 5;
 250         StrBufPrintf(SendMsg->MyQEntry->StatusMessage,
 251                      "Timeout while connecting %s [%s]:%d ",
 252                      SendMsg->mx_host,
 253                      buf,
 254                      SendMsg->IO.ConnectMe->Port);
 255         SendMsg->IO.NextState = eConnect;
 256 }
 257
 258 /*****************************************************************************
 259  * So we connect our Relay IP here.                                          *
 260  *****************************************************************************/
 261 eNextState mx_connect_ip(AsyncIO *IO)
 262 {
 263         SmtpOutMsg *SendMsg = IO->Data;
 264
 265         EVS_syslog(LOG_DEBUG, "SMTP: %s\n", __FUNCTION__);
 266
 267         IO->ConnectMe = SendMsg->pCurrRelay;
 268
 269         SetConnectStatus(IO);
 270
 271         return EvConnectSock(IO,
 272                              SMTP_C_ConnTimeout,
 273                              SMTP_C_ReadTimeouts[0],
 274                              1);
 275 }
 276
 277 eNextState get_one_mx_host_ip_done(AsyncIO *IO)
 278 {
 279         SmtpOutMsg *SendMsg = IO->Data;
 280         struct hostent *hostent;
 281
 282         QueryCbDone(IO);
 283
 284         hostent = SendMsg->HostLookup.VParsedDNSReply;
 285         if ((SendMsg->HostLookup.DNSStatus == ARES_SUCCESS) &&
 286             (hostent != NULL) ) {
 287                 memset(&SendMsg->pCurrRelay->Addr, 0, sizeof(struct in6_addr));
 288                 if (SendMsg->pCurrRelay->IPv6) {
 289                         memcpy(&SendMsg->pCurrRelay->Addr.sin6_addr.s6_addr,
 290                                &hostent->h_addr_list[0],
 291                                sizeof(struct in6_addr));
 292
 293                         SendMsg->pCurrRelay->Addr.sin6_family =
 294                                 hostent->h_addrtype;
 295                         SendMsg->pCurrRelay->Addr.sin6_port =
 296                                 htons(DefaultMXPort);
 297                 }
 298                 else {
 299                         struct sockaddr_in *addr;
 300                         /*
 301                          * Bypass the ns lookup result like this:
 302                          * IO->Addr.sin_addr.s_addr = inet_addr("127.0.0.1");
 303                          * addr->sin_addr.s_addr =
 304                          *   htonl((uint32_t)&hostent->h_addr_list[0]);
 305                          */
 306
 307                         addr = (struct sockaddr_in*) &SendMsg->pCurrRelay->Addr;
 308
 309                         memcpy(&addr->sin_addr.s_addr,
 310                                hostent->h_addr_list[0],
 311                                sizeof(uint32_t));
 312
 313                         addr->sin_family = hostent->h_addrtype;
 314                         addr->sin_port   = htons(DefaultMXPort);
 315                 }
 316                 SendMsg->mx_host = SendMsg->pCurrRelay->Host;
 317                 return mx_connect_ip(IO);
 318         }
 319         else
 320                 return FailOneAttempt(IO);
 321 }
 322
 323 eNextState get_one_mx_host_ip(AsyncIO *IO)
 324 {
 325         SmtpOutMsg * SendMsg = IO->Data;
 326         /*
 327          * here we start with the lookup of one host. it might be...
 328          * - the relay host *sigh*
 329          * - the direct hostname if there was no mx record
 330          * - one of the mx'es
 331          */
 332
 333         InitC_ares_dns(IO);
 334
 335         EVS_syslog(LOG_DEBUG, "SMTP: %s\n", __FUNCTION__);
 336
 337         EVS_syslog(LOG_DEBUG,
 338                   "SMTP client[%ld]: looking up %s-Record %s : %d ...\n",
 339                   SendMsg->n,
 340                   (SendMsg->pCurrRelay->IPv6)? "aaaa": "a",
 341                   SendMsg->pCurrRelay->Host,
 342                   SendMsg->pCurrRelay->Port);
 343
 344         if (!QueueQuery((SendMsg->pCurrRelay->IPv6)? ns_t_aaaa : ns_t_a,
 345                         SendMsg->pCurrRelay->Host,
 346                         &SendMsg->IO,
 347                         &SendMsg->HostLookup,
 348                         get_one_mx_host_ip_done))
 349         {
 350                 SendMsg->MyQEntry->Status = 5;
 351                 StrBufPrintf(SendMsg->MyQEntry->StatusMessage,
 352                              "No MX hosts found for <%s>", SendMsg->node);
 353                 SendMsg->IO.NextState = eTerminateConnection;
 354                 return IO->NextState;
 355         }
 356         IO->NextState = eReadDNSReply;
 357         return IO->NextState;
 358 }
 359
 360
 361 /*****************************************************************************
 362  * here we try to find out about the MX records for our recipients.          *
 363  *****************************************************************************/
 364 eNextState smtp_resolve_mx_record_done(AsyncIO *IO)
 365 {
 366         SmtpOutMsg * SendMsg = IO->Data;
 367         ParsedURL **pp;
 368
 369         QueryCbDone(IO);
 370
 371         EVS_syslog(LOG_DEBUG, "SMTP: %s\n", __FUNCTION__);
 372         pp = &SendMsg->Relay;
 373         while ((pp != NULL) && (*pp != NULL) && ((*pp)->Next != NULL))
 374                 pp = &(*pp)->Next;
 375
 376         if ((IO->DNS.Query->DNSStatus == ARES_SUCCESS) &&
 377             (IO->DNS.Query->VParsedDNSReply != NULL))
 378         { /* ok, we found mx records. */
 379                 SendMsg->IO.ErrMsg = SendMsg->MyQEntry->StatusMessage;
 380
 381                 SendMsg->CurrMX
 382                         = SendMsg->AllMX
 383                         = IO->DNS.Query->VParsedDNSReply;
 384                 while (SendMsg->CurrMX) {
 385                         int i;
 386                         for (i = 0; i < 2; i++) {
 387                                 ParsedURL *p;
 388
 389                                 p = (ParsedURL*) malloc(sizeof(ParsedURL));
 390                                 memset(p, 0, sizeof(ParsedURL));
 391                                 p->IsIP = 0;
 392                                 p->Port = DefaultMXPort;
 393                                 p->IPv6 = i == 1;
 394                                 p->Host = SendMsg->CurrMX->host;
 395
 396                                 *pp = p;
 397                                 pp = &p->Next;
 398                         }
 399                         SendMsg->CurrMX    = SendMsg->CurrMX->next;
 400                 }
 401                 SendMsg->CXFlags   = SendMsg->CXFlags & F_HAVE_MX;
 402         }
 403         else { /* else fall back to the plain hostname */
 404                 int i;
 405                 for (i = 0; i < 2; i++) {
 406                         ParsedURL *p;
 407
 408                         p = (ParsedURL*) malloc(sizeof(ParsedURL));
 409                         memset(p, 0, sizeof(ParsedURL));
 410                         p->IsIP = 0;
 411                         p->Port = DefaultMXPort;
 412                         p->IPv6 = i == 1;
 413                         p->Host = SendMsg->node;
 414
 415                         *pp = p;
 416                         pp = &p->Next;
 417                 }
 418                 SendMsg->CXFlags   = SendMsg->CXFlags & F_DIRECT;
 419         }
 420         *pp = SendMsg->MyQItem->FallBackHost;
 421         SendMsg->pCurrRelay = SendMsg->Relay;
 422         return get_one_mx_host_ip(IO);
 423 }
 424
 425 eNextState resolve_mx_records(AsyncIO *IO)
 426 {
 427         SmtpOutMsg * SendMsg = IO->Data;
 428
 429         EVS_syslog(LOG_DEBUG, "SMTP: %s\n", __FUNCTION__);
 430         /* start resolving MX records here. */
 431         if (!QueueQuery(ns_t_mx,
 432                         SendMsg->node,
 433                         &SendMsg->IO,
 434                         &SendMsg->MxLookup,
 435                         smtp_resolve_mx_record_done))
 436         {
 437                 SendMsg->MyQEntry->Status = 5;
 438                 StrBufPrintf(SendMsg->MyQEntry->StatusMessage,
 439                              "No MX hosts found for <%s>", SendMsg->node);
 440                 return IO->NextState;
 441         }
 442         SendMsg->IO.NextState = eReadDNSReply;
 443         return IO->NextState;
 444 }
 445
 446
 447
 448 /******************************************************************************
 449  *  so, we're going to start a SMTP delivery.  lets get it on.                *
 450  ******************************************************************************/
 451
 452 SmtpOutMsg *new_smtp_outmsg(OneQueItem *MyQItem,
 453                             MailQEntry *MyQEntry,
 454                             int MsgCount)
 455 {
 456         SmtpOutMsg * SendMsg;
 457
 458         SendMsg = (SmtpOutMsg *) malloc(sizeof(SmtpOutMsg));
 459         memset(SendMsg, 0, sizeof(SmtpOutMsg));
 460
 461         SendMsg->n                = MsgCount;
 462         SendMsg->MyQEntry         = MyQEntry;
 463         SendMsg->MyQItem          = MyQItem;
 464         SendMsg->pCurrRelay       = MyQItem->URL;
 465
 466         InitIOStruct(&SendMsg->IO,
 467                      SendMsg,
 468                      eReadMessage,
 469                      SMTP_C_ReadServerStatus,
 470                      SMTP_C_DNSFail,
 471                      SMTP_C_DispatchWriteDone,
 472                      SMTP_C_DispatchReadDone,
 473                      SMTP_C_Terminate,
 474                      SMTP_C_ConnFail,
 475                      SMTP_C_Timeout,
 476                      SMTP_C_Shutdown);
 477
 478         return SendMsg;
 479 }
 480
 481 void smtp_try_one_queue_entry(OneQueItem *MyQItem,
 482                               MailQEntry *MyQEntry,
 483                               StrBuf *MsgText,
 484                         /*KeepMsgText allows us to use MsgText as ours.*/
 485                               int KeepMsgText,
 486                               int MsgCount)
 487 {
 488         SmtpOutMsg *SendMsg;
 489
 490         syslog(LOG_DEBUG, "SMTP: %s\n", __FUNCTION__);
 491
 492         SendMsg = new_smtp_outmsg(MyQItem, MyQEntry, MsgCount);
 493         if (KeepMsgText) SendMsg->msgtext = MsgText;
 494         else             SendMsg->msgtext = NewStrBufDup(MsgText);
 495
 496         if (smtp_resolve_recipients(SendMsg)) {
 497
 498                 safestrncpy(
 499                         ((CitContext *)SendMsg->IO.CitContext)->cs_host,
 500                         SendMsg->node,
 501                         sizeof(((CitContext *)
 502                                 SendMsg->IO.CitContext)->cs_host));
 503
 504                 syslog(LOG_DEBUG, "SMTP Starting: [%ld] <%s> CC <%d> \n",
 505                        SendMsg->MyQItem->MessageID,
 506                        ChrPtr(SendMsg->MyQEntry->Recipient),
 507                        ((CitContext*)SendMsg->IO.CitContext)->cs_pid);
 508                 if (SendMsg->pCurrRelay == NULL)
 509                         QueueEventContext(&SendMsg->IO,
 510                                           resolve_mx_records);
 511                 else { /* oh... via relay host */
 512                         if (SendMsg->pCurrRelay->IsIP) {
 513                                 QueueEventContext(&SendMsg->IO,
 514                                                   mx_connect_ip);
 515                         }
 516                         else {
 517                                 /* uneducated admin has chosen to
 518                                    add DNS to the equation... */
 519                                 QueueEventContext(&SendMsg->IO,
 520                                                   get_one_mx_host_ip);
 521                         }
 522                 }
 523         }
 524         else {
 525                 /* No recipients? well fail then. */
 526                 if ((SendMsg==NULL) ||
 527                     (SendMsg->MyQEntry == NULL)) {
 528                         SendMsg->MyQEntry->Status = 5;
 529                         StrBufPlain(SendMsg->MyQEntry->StatusMessage,
 530                                     HKEY("Invalid Recipient!"));
 531                 }
 532                 FinalizeMessageSend(SendMsg);
 533         }
 534 }
 535
 536
 537
 538
 539
 540
 541 /*****************************************************************************/
 542 /*                     SMTP CLIENT DISPATCHER                                */
 543 /*****************************************************************************/
 544
 545 void SMTPSetTimeout(eNextState NextTCPState, SmtpOutMsg *pMsg)
 546 {
 547         double Timeout = 0.0;
 548         AsyncIO *IO = &pMsg->IO;
 549
 550         EVS_syslog(LOG_DEBUG, "SMTP: %s\n", __FUNCTION__);
 551
 552         switch (NextTCPState) {
 553         case eSendFile:
 554         case eSendReply:
 555         case eSendMore:
 556                 Timeout = SMTP_C_SendTimeouts[pMsg->State];
 557                 if (pMsg->State == eDATABody) {
 558                         /* if we're sending a huge message,
 559                          * we need more time.
 560                          */
 561                         Timeout += StrLength(pMsg->msgtext) / 1024;
 562                 }
 563                 break;
 564         case eReadMessage:
 565                 Timeout = SMTP_C_ReadTimeouts[pMsg->State];
 566                 if (pMsg->State == eDATATerminateBody) {
 567                         /*
 568                          * some mailservers take a nap before accepting
 569                          * the message content inspection and such.
 570                          */
 571                         Timeout += StrLength(pMsg->msgtext) / 1024;
 572                 }
 573                 break;
 574         case eSendDNSQuery:
 575         case eReadDNSReply:
 576         case eDBQuery:
 577         case eReadFile:
 578         case eReadMore:
 579         case eReadPayload:
 580         case eConnect:
 581         case eTerminateConnection:
 582         case eAbort:
 583                 return;
 584         }
 585         SetNextTimeout(&pMsg->IO, Timeout);
 586 }
 587 eNextState SMTP_C_DispatchReadDone(AsyncIO *IO)
 588 {
 589         EVS_syslog(LOG_DEBUG, "SMTP: %s\n", __FUNCTION__);
 590         SmtpOutMsg *pMsg = IO->Data;
 591         eNextState rc;
 592
 593         rc = ReadHandlers[pMsg->State](pMsg);
 594         if (rc != eAbort)
 595         {
 596                 pMsg->State++;
 597                 SMTPSetTimeout(rc, pMsg);
 598         }
 599         return rc;
 600 }
 601 eNextState SMTP_C_DispatchWriteDone(AsyncIO *IO)
 602 {
 603         EVS_syslog(LOG_DEBUG, "SMTP: %s\n", __FUNCTION__);
 604         SmtpOutMsg *pMsg = IO->Data;
 605         eNextState rc;
 606
 607         rc = SendHandlers[pMsg->State](pMsg);
 608         SMTPSetTimeout(rc, pMsg);
 609         return rc;
 610 }
 611
 612
 613 /*****************************************************************************/
 614 /*                     SMTP CLIENT ERROR CATCHERS                            */
 615 /*****************************************************************************/
 616 eNextState SMTP_C_Terminate(AsyncIO *IO)
 617 {
 618         SmtpOutMsg *pMsg = IO->Data;
 619
 620         EVS_syslog(LOG_DEBUG, "SMTP: %s\n", __FUNCTION__);
 621         FinalizeMessageSend(pMsg);
 622         return eAbort;
 623 }
 624 eNextState SMTP_C_Timeout(AsyncIO *IO)
 625 {
 626         SmtpOutMsg *pMsg = IO->Data;
 627
 628         EVS_syslog(LOG_DEBUG, "SMTP: %s\n", __FUNCTION__);
 629         StrBufPlain(IO->ErrMsg, CKEY(ReadErrors[pMsg->State]));
 630         return FailOneAttempt(IO);
 631 }
 632 eNextState SMTP_C_ConnFail(AsyncIO *IO)
 633 {
 634         SmtpOutMsg *pMsg = IO->Data;
 635
 636         EVS_syslog(LOG_DEBUG, "SMTP: %s\n", __FUNCTION__);
 637         StrBufPlain(IO->ErrMsg, CKEY(ReadErrors[pMsg->State]));
 638         return FailOneAttempt(IO);
 639 }
 640 eNextState SMTP_C_DNSFail(AsyncIO *IO)
 641 {
 642         EVS_syslog(LOG_DEBUG, "SMTP: %s\n", __FUNCTION__);
 643         return FailOneAttempt(IO);
 644 }
 645 eNextState SMTP_C_Shutdown(AsyncIO *IO)
 646 {
 647         EVS_syslog(LOG_DEBUG, "SMTP: %s\n", __FUNCTION__);
 648         SmtpOutMsg *pMsg = IO->Data;
 649
 650         pMsg->MyQEntry->Status = 3;
 651         StrBufPlain(pMsg->MyQEntry->StatusMessage,
 652                     HKEY("server shutdown during message submit."));
 653         FinalizeMessageSend(pMsg);
 654         return eAbort;
 655 }
 656
 657
 658 /**
 659  * @brief lineread Handler;
 660  * understands when to read more SMTP lines, and when this is a one-lined reply.
 661  */
 662 eReadState SMTP_C_ReadServerStatus(AsyncIO *IO)
 663 {
 664         eReadState Finished = eBufferNotEmpty;
 665
 666         while (Finished == eBufferNotEmpty) {
 667                 Finished = StrBufChunkSipLine(IO->IOBuf, &IO->RecvBuf);
 668
 669                 switch (Finished) {
 670                 case eMustReadMore: /// read new from socket...
 671                         return Finished;
 672                         break;
 673                 case eBufferNotEmpty: /* shouldn't happen... */
 674                 case eReadSuccess: /// done for now...
 675                         if (StrLength(IO->IOBuf) < 4)
 676                                 continue;
 677                         if (ChrPtr(IO->IOBuf)[3] == '-')
 678                                 Finished = eBufferNotEmpty;
 679                         else
 680                                 return Finished;
 681                         break;
 682                 case eReadFail: /// WHUT?
 683                         ///todo: shut down!
 684                         break;
 685                 }
 686         }
 687         return Finished;
 688 }
 689
 690 CTDL_MODULE_INIT(smtp_eventclient)
 691 {
 692         return "smtpeventclient";
 693 }