citadel/modules/smtp/serv_smtpeventclient.c

   1 /*
   2  * This module is an SMTP and ESMTP implementation for the Citadel system.
   3  * It is compliant with all of the following:
   4  *
   5  * RFC  821 - Simple Mail Transfer Protocol
   6  * RFC  876 - Survey of SMTP Implementations
   7  * RFC 1047 - Duplicate messages and SMTP
   8  * RFC 1652 - 8 bit MIME
   9  * RFC 1869 - Extended Simple Mail Transfer Protocol
  10  * RFC 1870 - SMTP Service Extension for Message Size Declaration
  11  * RFC 2033 - Local Mail Transfer Protocol
  12  * RFC 2197 - SMTP Service Extension for Command Pipelining
  13  * RFC 2476 - Message Submission
  14  * RFC 2487 - SMTP Service Extension for Secure SMTP over TLS
  15  * RFC 2554 - SMTP Service Extension for Authentication
  16  * RFC 2821 - Simple Mail Transfer Protocol
  17  * RFC 2822 - Internet Message Format
  18  * RFC 2920 - SMTP Service Extension for Command Pipelining
  19  *
  20  * The VRFY and EXPN commands have been removed from this implementation
  21  * because nobody uses these commands anymore, except for spammers.
  22  *
  23  * Copyright (c) 1998-2009 by the citadel.org team
  24  *
  25  *  This program is free software; you can redistribute it and/or modify
  26  *  it under the terms of the GNU General Public License as published by
  27  *  the Free Software Foundation; either version 3 of the License, or
  28  *  (at your option) any later version.
  29  *
  30  *  This program is distributed in the hope that it will be useful,
  31  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  32  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  33  *  GNU General Public License for more details.
  34  *
  35  *  You should have received a copy of the GNU General Public License
  36  *  along with this program; if not, write to the Free Software
  37  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  38  */
  39
  40 #include "sysdep.h"
  41 #include <stdlib.h>
  42 #include <unistd.h>
  43 #include <stdio.h>
  44 #include <termios.h>
  45 #include <fcntl.h>
  46 #include <signal.h>
  47 #include <pwd.h>
  48 #include <errno.h>
  49 #include <sys/types.h>
  50 #include <syslog.h>
  51
  52 #if TIME_WITH_SYS_TIME
  53 # include <sys/time.h>
  54 # include <time.h>
  55 #else
  56 # if HAVE_SYS_TIME_H
  57 #  include <sys/time.h>
  58 # else
  59 #  include <time.h>
  60 # endif
  61 #endif
  62 #include <sys/wait.h>
  63 #include <ctype.h>
  64 #include <string.h>
  65 #include <limits.h>
  66 #include <sys/socket.h>
  67 #include <netinet/in.h>
  68 #include <arpa/inet.h>
  69 #include <libcitadel.h>
  70 #include "citadel.h"
  71 #include "server.h"
  72 #include "citserver.h"
  73 #include "support.h"
  74 #include "config.h"
  75 #include "control.h"
  76 #include "user_ops.h"
  77 #include "database.h"
  78 #include "msgbase.h"
  79 #include "internet_addressing.h"
  80 #include "genstamp.h"
  81 #include "domain.h"
  82 #include "clientsocket.h"
  83 #include "locate_host.h"
  84 #include "citadel_dirs.h"
  85
  86 #include "ctdl_module.h"
  87
  88 #include "smtp_util.h"
  89 #include "event_client.h"
  90 #include "smtpqueue.h"
  91 #include "smtp_clienthandlers.h"
  92
  93 const unsigned short DefaultMXPort = 25;
  94 void DeleteSmtpOutMsg(void *v)
  95 {
  96         SmtpOutMsg *Msg = v;
  97
  98         ares_free_data(Msg->AllMX);
  99         if (Msg->HostLookup.VParsedDNSReply != NULL)
 100                 Msg->HostLookup.DNSReplyFree(Msg->HostLookup.VParsedDNSReply);
 101         FreeURL(&Msg->Relay);
 102         FreeStrBuf(&Msg->msgtext);
 103         FreeAsyncIOContents(&Msg->IO);
 104         memset (Msg, 0, sizeof(SmtpOutMsg)); /* just to be shure... */
 105         free(Msg);
 106 }
 107
 108 eNextState SMTP_C_Shutdown(AsyncIO *IO);
 109 eNextState SMTP_C_Timeout(AsyncIO *IO);
 110 eNextState SMTP_C_ConnFail(AsyncIO *IO);
 111 eNextState SMTP_C_DispatchReadDone(AsyncIO *IO);
 112 eNextState SMTP_C_DispatchWriteDone(AsyncIO *IO);
 113 eNextState SMTP_C_DNSFail(AsyncIO *IO);
 114 eNextState SMTP_C_Terminate(AsyncIO *IO);
 115 eReadState SMTP_C_ReadServerStatus(AsyncIO *IO);
 116
 117 eNextState mx_connect_ip(AsyncIO *IO);
 118 eNextState get_one_mx_host_ip(AsyncIO *IO);
 119
 120 /******************************************************************************
 121  * So, we're finished with sending (regardless of success or failure)         *
 122  * This Message might be referenced by several Queue-Items, if we're the last,*
 123  * we need to free the memory and send bounce messages (on terminal failure)  *
 124  * else we just free our SMTP-Message struct.                                 *
 125  ******************************************************************************/
 126 void FinalizeMessageSend(SmtpOutMsg *Msg)
 127 {
 128         int IDestructQueItem;
 129         int nRemain;
 130         StrBuf *MsgData;
 131         AsyncIO *IO = &Msg->IO;
 132
 133         IDestructQueItem = DecreaseQReference(Msg->MyQItem);
 134
 135         nRemain = CountActiveQueueEntries(Msg->MyQItem);
 136
 137         if ((nRemain > 0) || IDestructQueItem)
 138                 MsgData = SerializeQueueItem(Msg->MyQItem);
 139         else
 140                 MsgData = NULL;
 141
 142         /*
 143          * Uncompleted delivery instructions remain, so delete the old
 144          * instructions and replace with the updated ones.
 145          */
 146         EVS_syslog(LOG_DEBUG, "SMTPQD: %ld", Msg->MyQItem->QueMsgID);
 147         CtdlDeleteMessages(SMTP_SPOOLOUT_ROOM, &Msg->MyQItem->QueMsgID, 1, "");
 148
 149         if (IDestructQueItem)
 150                 smtpq_do_bounce(Msg->MyQItem,Msg->msgtext);
 151
 152         if (nRemain > 0)
 153         {
 154                 struct CtdlMessage *msg;
 155                 msg = malloc(sizeof(struct CtdlMessage));
 156                 memset(msg, 0, sizeof(struct CtdlMessage));
 157                 msg->cm_magic = CTDLMESSAGE_MAGIC;
 158                 msg->cm_anon_type = MES_NORMAL;
 159                 msg->cm_format_type = FMT_RFC822;
 160                 msg->cm_fields['M'] = SmashStrBuf(&MsgData);
 161                 Msg->MyQItem->QueMsgID =
 162                         CtdlSubmitMsg(msg, NULL, SMTP_SPOOLOUT_ROOM, QP_EADDR);
 163                 EVS_syslog(LOG_DEBUG, "SMTPQ: %ld", Msg->MyQItem->QueMsgID);
 164                 CtdlFreeMessage(msg);
 165         }
 166         else {
 167                 CtdlDeleteMessages(SMTP_SPOOLOUT_ROOM,
 168                                    &Msg->MyQItem->MessageID,
 169                                    1,
 170                                    "");
 171                 FreeStrBuf(&MsgData);
 172         }
 173         RemoveContext(Msg->IO.CitContext);
 174         if (IDestructQueItem)
 175                 RemoveQItem(Msg->MyQItem);
 176         DeleteSmtpOutMsg(Msg);
 177 }
 178
 179 eNextState FailOneAttempt(AsyncIO *IO)
 180 {
 181         SmtpOutMsg *SendMsg = IO->Data;
 182
 183         if (SendMsg->MyQEntry->Status == 2)
 184                 return eAbort;
 185
 186         /*
 187          * possible ways here:
 188          * - connection timeout
 189          * -
 190          */
 191         StopClientWatchers(IO);
 192
 193         if (SendMsg->pCurrRelay != NULL)
 194                 SendMsg->pCurrRelay = SendMsg->pCurrRelay->Next;
 195
 196         if (SendMsg->pCurrRelay == NULL)
 197                 return eAbort;
 198         if (SendMsg->pCurrRelay->IsIP)
 199                 return mx_connect_ip(IO);
 200         else
 201                 return get_one_mx_host_ip(IO);
 202 }
 203
 204
 205 void SetConnectStatus(AsyncIO *IO)
 206 {
 207
 208         SmtpOutMsg *SendMsg = IO->Data;
 209         char buf[256];
 210         void *src;
 211
 212         buf[0] = '\0';
 213
 214         if (IO->ConnectMe->IPv6) {
 215                 src = &IO->ConnectMe->Addr.sin6_addr;
 216         }
 217         else {
 218                 struct sockaddr_in *addr = (struct sockaddr_in *)&IO->ConnectMe->Addr;
 219
 220                 src = &addr->sin_addr.s_addr;
 221         }
 222
 223         inet_ntop((IO->ConnectMe->IPv6)?AF_INET6:AF_INET,
 224                   src,
 225                   buf,
 226                   sizeof(buf));
 227
 228         if (SendMsg->mx_host == NULL)
 229                 SendMsg->mx_host = "<no MX-Record>";
 230
 231         EVS_syslog(LOG_DEBUG,
 232                   "SMTP client[%ld]: connecting to %s [%s]:%d ...\n",
 233                   SendMsg->n,
 234                   SendMsg->mx_host,
 235                   buf,
 236                   SendMsg->IO.ConnectMe->Port);
 237
 238         SendMsg->MyQEntry->Status = 5;
 239         StrBufPrintf(SendMsg->MyQEntry->StatusMessage,
 240                      "Timeout while connecting %s [%s]:%d ",
 241                      SendMsg->mx_host,
 242                      buf,
 243                      SendMsg->IO.ConnectMe->Port);
 244         SendMsg->IO.NextState = eConnect;
 245 }
 246
 247 /*****************************************************************************
 248  * So we connect our Relay IP here.                                          *
 249  *****************************************************************************/
 250 eNextState mx_connect_ip(AsyncIO *IO)
 251 {
 252         SmtpOutMsg *SendMsg = IO->Data;
 253
 254         EVS_syslog(LOG_DEBUG, "SMTP: %s\n", __FUNCTION__);
 255
 256         IO->ConnectMe = SendMsg->pCurrRelay;
 257         /*  Bypass the ns lookup result like this: IO->Addr.sin_addr.s_addr = inet_addr("127.0.0.1"); */
 258
 259         SetConnectStatus(IO);
 260
 261         return InitEventIO(IO, SendMsg,
 262                            SMTP_C_ConnTimeout,
 263                            SMTP_C_ReadTimeouts[0],
 264                            1);
 265 }
 266
 267 eNextState get_one_mx_host_ip_done(AsyncIO *IO)
 268 {
 269         SmtpOutMsg *SendMsg = IO->Data;
 270         struct hostent *hostent;
 271
 272         QueryCbDone(IO);
 273
 274         hostent = SendMsg->HostLookup.VParsedDNSReply;
 275         if ((SendMsg->HostLookup.DNSStatus == ARES_SUCCESS) &&
 276             (hostent != NULL) ) {
 277                 memset(&SendMsg->pCurrRelay->Addr, 0, sizeof(struct in6_addr));
 278                 if (SendMsg->pCurrRelay->IPv6) {
 279                         memcpy(&SendMsg->pCurrRelay->Addr.sin6_addr.s6_addr,
 280                                &hostent->h_addr_list[0],
 281                                sizeof(struct in6_addr));
 282
 283                         SendMsg->pCurrRelay->Addr.sin6_family = hostent->h_addrtype;
 284                         SendMsg->pCurrRelay->Addr.sin6_port   = htons(DefaultMXPort);
 285                 }
 286                 else {
 287                         struct sockaddr_in *addr = (struct sockaddr_in*) &SendMsg->pCurrRelay->Addr;
 288                         /* Bypass the ns lookup result like this: IO->Addr.sin_addr.s_addr = inet_addr("127.0.0.1"); */
 289 //                      addr->sin_addr.s_addr = htonl((uint32_t)&hostent->h_addr_list[0]);
 290                         memcpy(&addr->sin_addr.s_addr,
 291                                hostent->h_addr_list[0],
 292                                sizeof(uint32_t));
 293
 294                         addr->sin_family = hostent->h_addrtype;
 295                         addr->sin_port   = htons(DefaultMXPort);
 296
 297                 }
 298                 SendMsg->mx_host = SendMsg->pCurrRelay->Host;
 299                 return mx_connect_ip(IO);
 300         }
 301         else // TODO: here we need to find out whether there are more mx'es, backup relay, and so on
 302                 return FailOneAttempt(IO);
 303 }
 304
 305 eNextState get_one_mx_host_ip(AsyncIO *IO)
 306 {
 307         SmtpOutMsg * SendMsg = IO->Data;
 308         /*
 309          * here we start with the lookup of one host. it might be...
 310          * - the relay host *sigh*
 311          * - the direct hostname if there was no mx record
 312          * - one of the mx'es
 313          */
 314
 315         InitC_ares_dns(IO);
 316
 317         EVS_syslog(LOG_DEBUG, "SMTP: %s\n", __FUNCTION__);
 318
 319         EVS_syslog(LOG_DEBUG,
 320                   "SMTP client[%ld]: looking up %s-Record %s : %d ...\n",
 321                   SendMsg->n,
 322                   (SendMsg->pCurrRelay->IPv6)? "aaaa": "a",
 323                   SendMsg->pCurrRelay->Host,
 324                   SendMsg->pCurrRelay->Port);
 325
 326         if (!QueueQuery((SendMsg->pCurrRelay->IPv6)? ns_t_aaaa : ns_t_a,
 327                         SendMsg->pCurrRelay->Host,
 328                         &SendMsg->IO,
 329                         &SendMsg->HostLookup,
 330                         get_one_mx_host_ip_done))
 331         {
 332                 SendMsg->MyQEntry->Status = 5;
 333                 StrBufPrintf(SendMsg->MyQEntry->StatusMessage,
 334                              "No MX hosts found for <%s>", SendMsg->node);
 335                 SendMsg->IO.NextState = eTerminateConnection;
 336                 return IO->NextState;
 337         }
 338         IO->NextState = eReadDNSReply;
 339         return IO->NextState;
 340 }
 341
 342
 343 /*****************************************************************************
 344  * here we try to find out about the MX records for our recipients.          *
 345  *****************************************************************************/
 346 eNextState smtp_resolve_mx_record_done(AsyncIO *IO)
 347 {
 348         SmtpOutMsg * SendMsg = IO->Data;
 349         ParsedURL **pp;
 350
 351         QueryCbDone(IO);
 352
 353         EVS_syslog(LOG_DEBUG, "SMTP: %s\n", __FUNCTION__);
 354         pp = &SendMsg->Relay;
 355         while ((pp != NULL) && (*pp != NULL) && ((*pp)->Next != NULL))
 356                 pp = &(*pp)->Next;
 357
 358         if ((IO->DNSQuery->DNSStatus == ARES_SUCCESS) &&
 359             (IO->DNSQuery->VParsedDNSReply != NULL))
 360         { /* ok, we found mx records. */
 361                 SendMsg->IO.ErrMsg = SendMsg->MyQEntry->StatusMessage;
 362
 363                 SendMsg->CurrMX    = SendMsg->AllMX
 364                                    = IO->DNSQuery->VParsedDNSReply;
 365                 while (SendMsg->CurrMX) {
 366                         int i;
 367                         for (i = 0; i < 2; i++) {
 368                                 ParsedURL *p;
 369
 370                                 p = (ParsedURL*) malloc(sizeof(ParsedURL));
 371                                 memset(p, 0, sizeof(ParsedURL));
 372                                 p->IsIP = 0;
 373                                 p->Port = DefaultMXPort;
 374                                 p->IPv6 = i == 1;
 375                                 p->Host = SendMsg->CurrMX->host;
 376
 377                                 *pp = p;
 378                                 pp = &p->Next;
 379                         }
 380                         SendMsg->CurrMX    = SendMsg->CurrMX->next;
 381                 }
 382                 SendMsg->CXFlags   = SendMsg->CXFlags & F_HAVE_MX;
 383         }
 384         else { /* else fall back to the plain hostname */
 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->node;
 395
 396                         *pp = p;
 397                         pp = &p->Next;
 398                 }
 399                 SendMsg->CXFlags   = SendMsg->CXFlags & F_DIRECT;
 400         }
 401         *pp = SendMsg->MyQItem->FallBackHost;
 402         SendMsg->pCurrRelay = SendMsg->Relay;
 403         return get_one_mx_host_ip(IO);
 404 }
 405
 406 eNextState resolve_mx_records(AsyncIO *IO)
 407 {
 408         SmtpOutMsg * SendMsg = IO->Data;
 409
 410         EVS_syslog(LOG_DEBUG, "SMTP: %s\n", __FUNCTION__);
 411         /* start resolving MX records here. */
 412         if (!QueueQuery(ns_t_mx,
 413                         SendMsg->node,
 414                         &SendMsg->IO,
 415                         &SendMsg->MxLookup,
 416                         smtp_resolve_mx_record_done))
 417         {
 418                 SendMsg->MyQEntry->Status = 5;
 419                 StrBufPrintf(SendMsg->MyQEntry->StatusMessage,
 420                              "No MX hosts found for <%s>", SendMsg->node);
 421                 return IO->NextState;
 422         }
 423         SendMsg->IO.NextState = eReadDNSReply;
 424         return IO->NextState;
 425 }
 426
 427
 428
 429 /******************************************************************************
 430  *  so, we're going to start a SMTP delivery.  lets get it on.                *
 431  ******************************************************************************/
 432
 433 SmtpOutMsg *new_smtp_outmsg(OneQueItem *MyQItem,
 434                             MailQEntry *MyQEntry,
 435                             int MsgCount)
 436 {
 437         SmtpOutMsg * SendMsg;
 438
 439         SendMsg = (SmtpOutMsg *) malloc(sizeof(SmtpOutMsg));
 440         memset(SendMsg, 0, sizeof(SmtpOutMsg));
 441
 442         SendMsg->n                = MsgCount;
 443         SendMsg->MyQEntry         = MyQEntry;
 444         SendMsg->MyQItem          = MyQItem;
 445         SendMsg->pCurrRelay       = MyQItem->URL;
 446
 447         SendMsg->IO.Data          = SendMsg;
 448
 449         SendMsg->IO.SendDone      = SMTP_C_DispatchWriteDone;
 450         SendMsg->IO.ReadDone      = SMTP_C_DispatchReadDone;
 451         SendMsg->IO.Terminate     = SMTP_C_Terminate;
 452         SendMsg->IO.LineReader    = SMTP_C_ReadServerStatus;
 453         SendMsg->IO.ConnFail      = SMTP_C_ConnFail;
 454         SendMsg->IO.DNSFail       = SMTP_C_DNSFail;
 455         SendMsg->IO.Timeout       = SMTP_C_Timeout;
 456         SendMsg->IO.ShutdownAbort = SMTP_C_Shutdown;
 457
 458         SendMsg->IO.SendBuf.Buf   = NewStrBufPlain(NULL, 1024);
 459         SendMsg->IO.RecvBuf.Buf   = NewStrBufPlain(NULL, 1024);
 460         SendMsg->IO.IOBuf         = NewStrBuf();
 461
 462         SendMsg->IO.NextState     = eReadMessage;
 463
 464         return SendMsg;
 465 }
 466
 467 void smtp_try_one_queue_entry(OneQueItem *MyQItem,
 468                               MailQEntry *MyQEntry,
 469                               StrBuf *MsgText,
 470                               int KeepMsgText,  /* KeepMsgText allows us to use MsgText as ours. */
 471                               int MsgCount)
 472 {
 473         AsyncIO *IO;
 474         SmtpOutMsg *SendMsg;
 475
 476         syslog(LOG_DEBUG, "SMTP: %s\n", __FUNCTION__);
 477
 478         SendMsg = new_smtp_outmsg(MyQItem, MyQEntry, MsgCount);
 479         IO = &SendMsg->IO;
 480         if (KeepMsgText) SendMsg->msgtext = MsgText;
 481         else             SendMsg->msgtext = NewStrBufDup(MsgText);
 482
 483         if (smtp_resolve_recipients(SendMsg)) {
 484                 CitContext *SubC;
 485                 SubC = CloneContext (CC);
 486                 SubC->session_specific_data = (char*) SendMsg;
 487                 SendMsg->IO.CitContext = SubC;
 488
 489                 safestrncpy(SubC->cs_host, SendMsg->node, sizeof(SubC->cs_host));
 490                 syslog(LOG_DEBUG, "SMTP Starting: [%ld] <%s> CC <%d> \n",
 491                        SendMsg->MyQItem->MessageID,
 492                        ChrPtr(SendMsg->MyQEntry->Recipient),
 493                        ((CitContext*)SendMsg->IO.CitContext)->cs_pid);
 494                 if (SendMsg->pCurrRelay == NULL)
 495                         QueueEventContext(&SendMsg->IO,
 496                                           resolve_mx_records);
 497                 else { /* oh... via relay host */
 498                         if (SendMsg->pCurrRelay->IsIP) {
 499                                 QueueEventContext(&SendMsg->IO,
 500                                                   mx_connect_ip);
 501                         }
 502                         else { /* uneducated admin has chosen to add DNS to the equation... */
 503                                 QueueEventContext(&SendMsg->IO,
 504                                                   get_one_mx_host_ip);
 505                         }
 506                 }
 507         }
 508         else {
 509                 /* No recipients? well fail then. */
 510                 if ((SendMsg==NULL) ||
 511                     (SendMsg->MyQEntry == NULL)) {
 512                         SendMsg->MyQEntry->Status = 5;
 513                         StrBufPlain(SendMsg->MyQEntry->StatusMessage,
 514                                     HKEY("Invalid Recipient!"));
 515                 }
 516                 FinalizeMessageSend(SendMsg);
 517         }
 518 }
 519
 520
 521
 522
 523
 524
 525 /*****************************************************************************/
 526 /*                     SMTP CLIENT DISPATCHER                                */
 527 /*****************************************************************************/
 528
 529 void SMTPSetTimeout(eNextState NextTCPState, SmtpOutMsg *pMsg)
 530 {
 531         double Timeout = 0.0;
 532         AsyncIO *IO = &pMsg->IO;
 533
 534         EVS_syslog(LOG_DEBUG, "SMTP: %s\n", __FUNCTION__);
 535
 536         switch (NextTCPState) {
 537         case eSendFile:
 538         case eSendReply:
 539         case eSendMore:
 540                 Timeout = SMTP_C_SendTimeouts[pMsg->State];
 541                 if (pMsg->State == eDATABody) {
 542                         /* if we're sending a huge message, we need more time. */
 543                         Timeout += StrLength(pMsg->msgtext) / 1024;
 544                 }
 545                 break;
 546         case eReadMessage:
 547                 Timeout = SMTP_C_ReadTimeouts[pMsg->State];
 548                 if (pMsg->State == eDATATerminateBody) {
 549                         /*
 550                          * some mailservers take a nap before accepting the message
 551                          * content inspection and such.
 552                          */
 553                         Timeout += StrLength(pMsg->msgtext) / 1024;
 554                 }
 555                 break;
 556         case eSendDNSQuery:
 557         case eReadDNSReply:
 558         case eDBQuery:
 559         case eReadFile:
 560         case eReadMore:
 561         case eReadPayload:
 562         case eConnect:
 563         case eTerminateConnection:
 564         case eAbort:
 565                 return;
 566         }
 567         SetNextTimeout(&pMsg->IO, Timeout);
 568 }
 569 eNextState SMTP_C_DispatchReadDone(AsyncIO *IO)
 570 {
 571         EVS_syslog(LOG_DEBUG, "SMTP: %s\n", __FUNCTION__);
 572         SmtpOutMsg *pMsg = IO->Data;
 573         eNextState rc;
 574
 575         rc = ReadHandlers[pMsg->State](pMsg);
 576         if (rc != eAbort)
 577         {
 578                 pMsg->State++;
 579                 SMTPSetTimeout(rc, pMsg);
 580         }
 581         return rc;
 582 }
 583 eNextState SMTP_C_DispatchWriteDone(AsyncIO *IO)
 584 {
 585         EVS_syslog(LOG_DEBUG, "SMTP: %s\n", __FUNCTION__);
 586         SmtpOutMsg *pMsg = IO->Data;
 587         eNextState rc;
 588
 589         rc = SendHandlers[pMsg->State](pMsg);
 590         SMTPSetTimeout(rc, pMsg);
 591         return rc;
 592 }
 593
 594
 595 /*****************************************************************************/
 596 /*                     SMTP CLIENT ERROR CATCHERS                            */
 597 /*****************************************************************************/
 598 eNextState SMTP_C_Terminate(AsyncIO *IO)
 599 {
 600         SmtpOutMsg *pMsg = IO->Data;
 601
 602         EVS_syslog(LOG_DEBUG, "SMTP: %s\n", __FUNCTION__);
 603         FinalizeMessageSend(pMsg);
 604         return eAbort;
 605 }
 606 eNextState SMTP_C_Timeout(AsyncIO *IO)
 607 {
 608         SmtpOutMsg *pMsg = IO->Data;
 609
 610         EVS_syslog(LOG_DEBUG, "SMTP: %s\n", __FUNCTION__);
 611         StrBufPlain(IO->ErrMsg, CKEY(ReadErrors[pMsg->State]));
 612         return FailOneAttempt(IO);
 613 }
 614 eNextState SMTP_C_ConnFail(AsyncIO *IO)
 615 {
 616         SmtpOutMsg *pMsg = IO->Data;
 617
 618         EVS_syslog(LOG_DEBUG, "SMTP: %s\n", __FUNCTION__);
 619         StrBufPlain(IO->ErrMsg, CKEY(ReadErrors[pMsg->State]));
 620         return FailOneAttempt(IO);
 621 }
 622 eNextState SMTP_C_DNSFail(AsyncIO *IO)
 623 {
 624         SmtpOutMsg *pMsg = IO->Data;
 625
 626         EVS_syslog(LOG_DEBUG, "SMTP: %s\n", __FUNCTION__);
 627         StrBufPlain(IO->ErrMsg, CKEY(ReadErrors[pMsg->State]));
 628         return FailOneAttempt(IO);
 629 }
 630 eNextState SMTP_C_Shutdown(AsyncIO *IO)
 631 {
 632         EVS_syslog(LOG_DEBUG, "SMTP: %s\n", __FUNCTION__);
 633         SmtpOutMsg *pMsg = IO->Data;
 634
 635         pMsg->MyQEntry->Status = 3;
 636         StrBufPlain(pMsg->MyQEntry->StatusMessage, HKEY("server shutdown during message submit."));
 637         FinalizeMessageSend(pMsg);
 638         return eAbort;
 639 }
 640
 641
 642 /**
 643  * @brief lineread Handler; understands when to read more SMTP lines, and when this is a one-lined reply.
 644  */
 645 eReadState SMTP_C_ReadServerStatus(AsyncIO *IO)
 646 {
 647         eReadState Finished = eBufferNotEmpty;
 648
 649         while (Finished == eBufferNotEmpty) {
 650                 Finished = StrBufChunkSipLine(IO->IOBuf, &IO->RecvBuf);
 651
 652                 switch (Finished) {
 653                 case eMustReadMore: /// read new from socket...
 654                         return Finished;
 655                         break;
 656                 case eBufferNotEmpty: /* shouldn't happen... */
 657                 case eReadSuccess: /// done for now...
 658                         if (StrLength(IO->IOBuf) < 4)
 659                                 continue;
 660                         if (ChrPtr(IO->IOBuf)[3] == '-')
 661                                 Finished = eBufferNotEmpty;
 662                         else
 663                                 return Finished;
 664                         break;
 665                 case eReadFail: /// WHUT?
 666                         ///todo: shut down!
 667                         break;
 668                 }
 669         }
 670         return Finished;
 671 }
 672
 673 CTDL_MODULE_INIT(smtp_eventclient)
 674 {
 675         return "smtpeventclient";
 676 }