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