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) 1998-2012 by the citadel.org team
  24  *
  25  *  This program is open source software; you can redistribute it and/or modify
  26  *  it under the terms of the GNU General Public License version 3.
  27  *
  28  *
  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  *
  36  *
  37  *
  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         AsyncIO *IO = &Msg->IO;
  98         EV_syslog(LOG_DEBUG, "SMTP: %s Aborting\n", __FUNCTION__);
  99
 100         /* these are kept in our own space and free'd below */
 101         Msg->IO.ConnectMe = NULL;
 102
 103         ares_free_data(Msg->AllMX);
 104         if (Msg->HostLookup.VParsedDNSReply != NULL)
 105                 Msg->HostLookup.DNSReplyFree(Msg->HostLookup.VParsedDNSReply);
 106         FreeURL(&Msg->Relay);
 107         FreeStrBuf(&Msg->msgtext);
 108         FreeAsyncIOContents(&Msg->IO);
 109         memset (Msg, 0, sizeof(SmtpOutMsg)); /* just to be shure... */
 110         free(Msg);
 111 }
 112
 113 eNextState SMTP_C_Shutdown(AsyncIO *IO);
 114 eNextState SMTP_C_Timeout(AsyncIO *IO);
 115 eNextState SMTP_C_ConnFail(AsyncIO *IO);
 116 eNextState SMTP_C_DispatchReadDone(AsyncIO *IO);
 117 eNextState SMTP_C_DispatchWriteDone(AsyncIO *IO);
 118 eNextState SMTP_C_DNSFail(AsyncIO *IO);
 119 eNextState SMTP_C_Terminate(AsyncIO *IO);
 120 eReadState SMTP_C_ReadServerStatus(AsyncIO *IO);
 121
 122 eNextState mx_connect_ip(AsyncIO *IO);
 123 eNextState get_one_mx_host_ip(AsyncIO *IO);
 124
 125 /******************************************************************************
 126  * So, we're finished with sending (regardless of success or failure)         *
 127  * This Message might be referenced by several Queue-Items, if we're the last,*
 128  * we need to free the memory and send bounce messages (on terminal failure)  *
 129  * else we just free our SMTP-Message struct.                                 *
 130  ******************************************************************************/
 131 void FinalizeMessageSend(SmtpOutMsg *Msg)
 132 {
 133         int IDestructQueItem;
 134         int nRemain;
 135         StrBuf *MsgData;
 136         AsyncIO *IO = &Msg->IO;
 137
 138         IDestructQueItem = DecreaseQReference(Msg->MyQItem);
 139
 140         nRemain = CountActiveQueueEntries(Msg->MyQItem);
 141
 142         if ((nRemain > 0) || IDestructQueItem)
 143                 MsgData = SerializeQueueItem(Msg->MyQItem);
 144         else
 145                 MsgData = NULL;
 146
 147         /*
 148          * Uncompleted delivery instructions remain, so delete the old
 149          * instructions and replace with the updated ones.
 150          */
 151         EVS_syslog(LOG_DEBUG, "SMTPQD: %ld", Msg->MyQItem->QueMsgID);
 152         CtdlDeleteMessages(SMTP_SPOOLOUT_ROOM, &Msg->MyQItem->QueMsgID, 1, "");
 153
 154         if (IDestructQueItem)
 155                 smtpq_do_bounce(Msg->MyQItem, Msg->msgtext);
 156
 157         if (nRemain > 0)
 158         {
 159                 struct CtdlMessage *msg;
 160                 msg = malloc(sizeof(struct CtdlMessage));
 161                 memset(msg, 0, sizeof(struct CtdlMessage));
 162                 msg->cm_magic = CTDLMESSAGE_MAGIC;
 163                 msg->cm_anon_type = MES_NORMAL;
 164                 msg->cm_format_type = FMT_RFC822;
 165                 msg->cm_fields['M'] = SmashStrBuf(&MsgData);
 166                 msg->cm_fields['U'] = strdup("QMSG");
 167                 Msg->MyQItem->QueMsgID =
 168                         CtdlSubmitMsg(msg, NULL, SMTP_SPOOLOUT_ROOM, QP_EADDR);
 169                 EVS_syslog(LOG_DEBUG, "SMTPQ: %ld", Msg->MyQItem->QueMsgID);
 170                 CtdlFreeMessage(msg);
 171         }
 172         else {
 173                 CtdlDeleteMessages(SMTP_SPOOLOUT_ROOM,
 174                                    &Msg->MyQItem->MessageID,
 175                                    1,
 176                                    "");
 177                 FreeStrBuf(&MsgData);
 178         }
 179         RemoveContext(Msg->IO.CitContext);
 180         if (IDestructQueItem)
 181                 RemoveQItem(Msg->MyQItem);
 182         DeleteSmtpOutMsg(Msg);
 183 }
 184
 185 eNextState FailOneAttempt(AsyncIO *IO)
 186 {
 187         SmtpOutMsg *Msg = IO->Data;
 188
 189         if (Msg->MyQEntry->Status == 2)
 190                 return eAbort;
 191
 192         /*
 193          * possible ways here:
 194          * - connection timeout
 195          * - dns lookup failed
 196          */
 197         StopClientWatchers(IO);
 198
 199         if (Msg->pCurrRelay != NULL)
 200                 Msg->pCurrRelay = Msg->pCurrRelay->Next;
 201
 202         if (Msg->pCurrRelay == NULL) {
 203                 EVS_syslog(LOG_DEBUG, "SMTP: %s Aborting\n", __FUNCTION__);
 204                 return eAbort;
 205         }
 206         if (Msg->pCurrRelay->IsIP) {
 207                 EVS_syslog(LOG_DEBUG, "SMTP: %s connecting IP\n", __FUNCTION__);
 208                 return mx_connect_ip(IO);
 209         }
 210         else {
 211                 EVS_syslog(LOG_DEBUG,
 212                            "SMTP: %s resolving next MX Record\n",
 213                            __FUNCTION__);
 214                 return get_one_mx_host_ip(IO);
 215         }
 216 }
 217
 218
 219 void SetConnectStatus(AsyncIO *IO)
 220 {
 221         SmtpOutMsg *Msg = IO->Data;
 222         char buf[256];
 223         void *src;
 224
 225         buf[0] = '\0';
 226
 227         if (IO->ConnectMe->IPv6) {
 228                 src = &IO->ConnectMe->Addr.sin6_addr;
 229         }
 230         else {
 231                 struct sockaddr_in *addr;
 232
 233                 addr = (struct sockaddr_in *)&IO->ConnectMe->Addr;
 234                 src = &addr->sin_addr.s_addr;
 235         }
 236
 237         inet_ntop((IO->ConnectMe->IPv6)?AF_INET6:AF_INET,
 238                   src,
 239                   buf,
 240                   sizeof(buf));
 241
 242         if (Msg->mx_host == NULL)
 243                 Msg->mx_host = "<no MX-Record>";
 244
 245         EVS_syslog(LOG_DEBUG,
 246                   "SMTP client[%ld]: connecting to %s [%s]:%d ...\n",
 247                   Msg->n,
 248                   Msg->mx_host,
 249                   buf,
 250                   Msg->IO.ConnectMe->Port);
 251
 252         Msg->MyQEntry->Status = 5;
 253         StrBufPrintf(Msg->MyQEntry->StatusMessage,
 254                      "Timeout while connecting %s [%s]:%d ",
 255                      Msg->mx_host,
 256                      buf,
 257                      Msg->IO.ConnectMe->Port);
 258         Msg->IO.NextState = eConnect;
 259 }
 260
 261 /*****************************************************************************
 262  * So we connect our Relay IP here.                                          *
 263  *****************************************************************************/
 264 eNextState mx_connect_ip(AsyncIO *IO)
 265 {
 266         SmtpOutMsg *Msg = IO->Data;
 267
 268         EVS_syslog(LOG_DEBUG, "SMTP: %s\n", __FUNCTION__);
 269
 270         IO->ConnectMe = Msg->pCurrRelay;
 271         Msg->State = eConnectMX;
 272
 273         SetConnectStatus(IO);
 274
 275         return EvConnectSock(IO,
 276                              SMTP_C_ConnTimeout,
 277                              SMTP_C_ReadTimeouts[0],
 278                              1);
 279 }
 280
 281 eNextState get_one_mx_host_ip_done(AsyncIO *IO)
 282 {
 283         SmtpOutMsg *Msg = IO->Data;
 284         struct hostent *hostent;
 285
 286         QueryCbDone(IO);
 287
 288         hostent = Msg->HostLookup.VParsedDNSReply;
 289         if ((Msg->HostLookup.DNSStatus == ARES_SUCCESS) &&
 290             (hostent != NULL) ) {
 291                 memset(&Msg->pCurrRelay->Addr, 0, sizeof(struct in6_addr));
 292                 if (Msg->pCurrRelay->IPv6) {
 293                         memcpy(&Msg->pCurrRelay->Addr.sin6_addr.s6_addr,
 294                                &hostent->h_addr_list[0],
 295                                sizeof(struct in6_addr));
 296
 297                         Msg->pCurrRelay->Addr.sin6_family =
 298                                 hostent->h_addrtype;
 299                         Msg->pCurrRelay->Addr.sin6_port =
 300                                 htons(DefaultMXPort);
 301                 }
 302                 else {
 303                         struct sockaddr_in *addr;
 304                         /*
 305                          * Bypass the ns lookup result like this:
 306                          * IO->Addr.sin_addr.s_addr = inet_addr("127.0.0.1");
 307                          * addr->sin_addr.s_addr =
 308                          *   htonl((uint32_t)&hostent->h_addr_list[0]);
 309                          */
 310
 311                         addr = (struct sockaddr_in*) &Msg->pCurrRelay->Addr;
 312
 313                         memcpy(&addr->sin_addr.s_addr,
 314                                hostent->h_addr_list[0],
 315                                sizeof(uint32_t));
 316
 317                         addr->sin_family = hostent->h_addrtype;
 318                         addr->sin_port   = htons(DefaultMXPort);
 319                 }
 320                 Msg->mx_host = Msg->pCurrRelay->Host;
 321                 return mx_connect_ip(IO);
 322         }
 323         else
 324                 return FailOneAttempt(IO);
 325 }
 326
 327 eNextState get_one_mx_host_ip(AsyncIO *IO)
 328 {
 329         SmtpOutMsg * Msg = IO->Data;
 330         /*
 331          * here we start with the lookup of one host. it might be...
 332          * - the relay host *sigh*
 333          * - the direct hostname if there was no mx record
 334          * - one of the mx'es
 335          */
 336
 337         InitC_ares_dns(IO);
 338
 339         EVS_syslog(LOG_DEBUG, "SMTP: %s\n", __FUNCTION__);
 340
 341         EVS_syslog(LOG_DEBUG,
 342                   "SMTP client[%ld]: looking up %s-Record %s : %d ...\n",
 343                   Msg->n,
 344                   (Msg->pCurrRelay->IPv6)? "aaaa": "a",
 345                   Msg->pCurrRelay->Host,
 346                   Msg->pCurrRelay->Port);
 347
 348         if (!QueueQuery((Msg->pCurrRelay->IPv6)? ns_t_aaaa : ns_t_a,
 349                         Msg->pCurrRelay->Host,
 350                         &Msg->IO,
 351                         &Msg->HostLookup,
 352                         get_one_mx_host_ip_done))
 353         {
 354                 Msg->MyQEntry->Status = 5;
 355                 StrBufPrintf(Msg->MyQEntry->StatusMessage,
 356                              "No MX hosts found for <%s>", Msg->node);
 357                 Msg->IO.NextState = eTerminateConnection;
 358                 return IO->NextState;
 359         }
 360         IO->NextState = eReadDNSReply;
 361         return IO->NextState;
 362 }
 363
 364
 365 /*****************************************************************************
 366  * here we try to find out about the MX records for our recipients.          *
 367  *****************************************************************************/
 368 eNextState smtp_resolve_mx_record_done(AsyncIO *IO)
 369 {
 370         SmtpOutMsg * Msg = IO->Data;
 371         ParsedURL **pp;
 372
 373         QueryCbDone(IO);
 374
 375         EVS_syslog(LOG_DEBUG, "SMTP: %s\n", __FUNCTION__);
 376
 377         pp = &Msg->Relay;
 378         while ((pp != NULL) && (*pp != NULL) && ((*pp)->Next != NULL))
 379                 pp = &(*pp)->Next;
 380
 381         if ((IO->DNS.Query->DNSStatus == ARES_SUCCESS) &&
 382             (IO->DNS.Query->VParsedDNSReply != NULL))
 383         { /* ok, we found mx records. */
 384
 385                 Msg->CurrMX
 386                         = Msg->AllMX
 387                         = IO->DNS.Query->VParsedDNSReply;
 388                 while (Msg->CurrMX) {
 389                         int i;
 390                         for (i = 0; i < 2; i++) {
 391                                 ParsedURL *p;
 392
 393                                 p = (ParsedURL*) malloc(sizeof(ParsedURL));
 394                                 memset(p, 0, sizeof(ParsedURL));
 395                                 p->Priority = Msg->CurrMX->priority;
 396                                 p->IsIP = 0;
 397                                 p->Port = DefaultMXPort;
 398                                 p->IPv6 = i == 1;
 399                                 p->Host = Msg->CurrMX->host;
 400                                 if (*pp == NULL)
 401                                         *pp = p;
 402                                 else {
 403                                         ParsedURL *ppp = *pp;
 404
 405                                         while ((ppp->Next != NULL) &&
 406                                                (ppp->Next->Priority <= p->Priority))
 407                                                ppp = ppp->Next;
 408                                         if ((ppp == *pp) &&
 409                                             (ppp->Priority > p->Priority)) {
 410                                                 p->Next = *pp;
 411                                                 *pp = p;
 412                                         }
 413                                         else {
 414                                                 p->Next = ppp->Next;
 415                                                 ppp->Next = p;
 416                                         }
 417                                 }
 418                         }
 419                         Msg->CurrMX    = Msg->CurrMX->next;
 420                 }
 421                 Msg->CXFlags   = Msg->CXFlags & F_HAVE_MX;
 422         }
 423         else { /* else fall back to the plain hostname */
 424                 int i;
 425                 for (i = 0; i < 2; i++) {
 426                         ParsedURL *p;
 427
 428                         p = (ParsedURL*) malloc(sizeof(ParsedURL));
 429                         memset(p, 0, sizeof(ParsedURL));
 430                         p->IsIP = 0;
 431                         p->Port = DefaultMXPort;
 432                         p->IPv6 = i == 1;
 433                         p->Host = Msg->node;
 434
 435                         *pp = p;
 436                         pp = &p->Next;
 437                 }
 438                 Msg->CXFlags   = Msg->CXFlags & F_DIRECT;
 439         }
 440         if (Msg->MyQItem->FallBackHost != NULL)
 441         {
 442                 Msg->MyQItem->FallBackHost->Next = *pp;
 443                 *pp = Msg->MyQItem->FallBackHost;
 444         }
 445         Msg->pCurrRelay = Msg->Relay;
 446         return get_one_mx_host_ip(IO);
 447 }
 448
 449 eNextState resolve_mx_records(AsyncIO *IO)
 450 {
 451         SmtpOutMsg * Msg = IO->Data;
 452
 453         EVS_syslog(LOG_DEBUG, "SMTP: %s\n", __FUNCTION__);
 454         /* start resolving MX records here. */
 455         if (!QueueQuery(ns_t_mx,
 456                         Msg->node,
 457                         &Msg->IO,
 458                         &Msg->MxLookup,
 459                         smtp_resolve_mx_record_done))
 460         {
 461                 Msg->MyQEntry->Status = 5;
 462                 StrBufPrintf(Msg->MyQEntry->StatusMessage,
 463                              "No MX hosts found for <%s>", Msg->node);
 464                 return IO->NextState;
 465         }
 466         Msg->IO.NextState = eReadDNSReply;
 467         return IO->NextState;
 468 }
 469
 470
 471
 472 /******************************************************************************
 473  *  so, we're going to start a SMTP delivery.  lets get it on.                *
 474  ******************************************************************************/
 475
 476 SmtpOutMsg *new_smtp_outmsg(OneQueItem *MyQItem,
 477                             MailQEntry *MyQEntry,
 478                             int MsgCount)
 479 {
 480         SmtpOutMsg * Msg;
 481
 482         Msg = (SmtpOutMsg *) malloc(sizeof(SmtpOutMsg));
 483         memset(Msg, 0, sizeof(SmtpOutMsg));
 484
 485         Msg->n                = MsgCount;
 486         Msg->MyQEntry         = MyQEntry;
 487         Msg->MyQItem          = MyQItem;
 488         Msg->pCurrRelay       = MyQItem->URL;
 489
 490         InitIOStruct(&Msg->IO,
 491                      Msg,
 492                      eReadMessage,
 493                      SMTP_C_ReadServerStatus,
 494                      SMTP_C_DNSFail,
 495                      SMTP_C_DispatchWriteDone,
 496                      SMTP_C_DispatchReadDone,
 497                      SMTP_C_Terminate,
 498                      SMTP_C_ConnFail,
 499                      SMTP_C_Timeout,
 500                      SMTP_C_Shutdown);
 501
 502         Msg->IO.ErrMsg = Msg->MyQEntry->StatusMessage;
 503
 504         return Msg;
 505 }
 506
 507 void smtp_try_one_queue_entry(OneQueItem *MyQItem,
 508                               MailQEntry *MyQEntry,
 509                               StrBuf *MsgText,
 510                         /*KeepMsgText allows us to use MsgText as ours.*/
 511                               int KeepMsgText,
 512                               int MsgCount)
 513 {
 514         SmtpOutMsg *Msg;
 515
 516         syslog(LOG_DEBUG, "SMTP: %s\n", __FUNCTION__);
 517
 518         Msg = new_smtp_outmsg(MyQItem, MyQEntry, MsgCount);
 519         if (KeepMsgText) Msg->msgtext = MsgText;
 520         else             Msg->msgtext = NewStrBufDup(MsgText);
 521
 522         if (smtp_resolve_recipients(Msg)) {
 523
 524                 safestrncpy(
 525                         ((CitContext *)Msg->IO.CitContext)->cs_host,
 526                         Msg->node,
 527                         sizeof(((CitContext *)
 528                                 Msg->IO.CitContext)->cs_host));
 529
 530                 syslog(LOG_DEBUG, "SMTP Starting: [%ld] <%s> CC <%d> \n",
 531                        Msg->MyQItem->MessageID,
 532                        ChrPtr(Msg->MyQEntry->Recipient),
 533                        ((CitContext*)Msg->IO.CitContext)->cs_pid);
 534                 if (Msg->pCurrRelay == NULL)
 535                         QueueEventContext(&Msg->IO,
 536                                           resolve_mx_records);
 537                 else { /* oh... via relay host */
 538                         if (Msg->pCurrRelay->IsIP) {
 539                                 QueueEventContext(&Msg->IO,
 540                                                   mx_connect_ip);
 541                         }
 542                         else {
 543                                 /* uneducated admin has chosen to
 544                                    add DNS to the equation... */
 545                                 QueueEventContext(&Msg->IO,
 546                                                   get_one_mx_host_ip);
 547                         }
 548                 }
 549         }
 550         else {
 551                 /* No recipients? well fail then. */
 552                 if ((Msg==NULL) ||
 553                     (Msg->MyQEntry == NULL)) {
 554                         Msg->MyQEntry->Status = 5;
 555                         StrBufPlain(Msg->MyQEntry->StatusMessage,
 556                                     HKEY("Invalid Recipient!"));
 557                 }
 558                 FinalizeMessageSend(Msg);
 559         }
 560 }
 561
 562
 563
 564
 565
 566
 567 /*****************************************************************************/
 568 /*                     SMTP CLIENT DISPATCHER                                */
 569 /*****************************************************************************/
 570
 571 void SMTPSetTimeout(eNextState NextTCPState, SmtpOutMsg *Msg)
 572 {
 573         double Timeout = 0.0;
 574         AsyncIO *IO = &Msg->IO;
 575
 576         EVS_syslog(LOG_DEBUG, "SMTP: %s\n", __FUNCTION__);
 577
 578         switch (NextTCPState) {
 579         case eSendFile:
 580         case eSendReply:
 581         case eSendMore:
 582                 Timeout = SMTP_C_SendTimeouts[Msg->State];
 583                 if (Msg->State == eDATABody) {
 584                         /* if we're sending a huge message,
 585                          * we need more time.
 586                          */
 587                         Timeout += StrLength(Msg->msgtext) / 512;
 588                 }
 589                 break;
 590         case eReadMessage:
 591                 Timeout = SMTP_C_ReadTimeouts[Msg->State];
 592                 if (Msg->State == eDATATerminateBody) {
 593                         /*
 594                          * some mailservers take a nap before accepting
 595                          * the message content inspection and such.
 596                          */
 597                         Timeout += StrLength(Msg->msgtext) / 512;
 598                 }
 599                 break;
 600         case eSendDNSQuery:
 601         case eReadDNSReply:
 602         case eDBQuery:
 603         case eReadFile:
 604         case eReadMore:
 605         case eReadPayload:
 606         case eConnect:
 607         case eTerminateConnection:
 608         case eAbort:
 609                 return;
 610         }
 611         SetNextTimeout(&Msg->IO, Timeout);
 612 }
 613 eNextState SMTP_C_DispatchReadDone(AsyncIO *IO)
 614 {
 615         EVS_syslog(LOG_DEBUG, "SMTP: %s\n", __FUNCTION__);
 616         SmtpOutMsg *Msg = IO->Data;
 617         eNextState rc;
 618
 619         rc = ReadHandlers[Msg->State](Msg);
 620         if (rc != eAbort)
 621         {
 622                 Msg->State++;
 623                 SMTPSetTimeout(rc, Msg);
 624         }
 625         return rc;
 626 }
 627 eNextState SMTP_C_DispatchWriteDone(AsyncIO *IO)
 628 {
 629         EVS_syslog(LOG_DEBUG, "SMTP: %s\n", __FUNCTION__);
 630         SmtpOutMsg *Msg = IO->Data;
 631         eNextState rc;
 632
 633         rc = SendHandlers[Msg->State](Msg);
 634         SMTPSetTimeout(rc, Msg);
 635         return rc;
 636 }
 637
 638
 639 /*****************************************************************************/
 640 /*                     SMTP CLIENT ERROR CATCHERS                            */
 641 /*****************************************************************************/
 642 eNextState SMTP_C_Terminate(AsyncIO *IO)
 643 {
 644         SmtpOutMsg *Msg = IO->Data;
 645
 646         EVS_syslog(LOG_DEBUG, "SMTP: %s\n", __FUNCTION__);
 647         FinalizeMessageSend(Msg);
 648         return eAbort;
 649 }
 650 eNextState SMTP_C_Timeout(AsyncIO *IO)
 651 {
 652         SmtpOutMsg *Msg = IO->Data;
 653
 654         Msg->MyQEntry->Status = 4;
 655         EVS_syslog(LOG_DEBUG, "SMTP: %s\n", __FUNCTION__);
 656         StrBufPlain(IO->ErrMsg, CKEY(ReadErrors[Msg->State]));
 657         if (Msg->State > eRCPT)
 658                 return eAbort;
 659         else
 660                 return FailOneAttempt(IO);
 661 }
 662 eNextState SMTP_C_ConnFail(AsyncIO *IO)
 663 {
 664         SmtpOutMsg *Msg = IO->Data;
 665
 666         Msg->MyQEntry->Status = 4;
 667         EVS_syslog(LOG_DEBUG, "SMTP: %s\n", __FUNCTION__);
 668         StrBufPlain(IO->ErrMsg, CKEY(ReadErrors[Msg->State]));
 669         return FailOneAttempt(IO);
 670 }
 671 eNextState SMTP_C_DNSFail(AsyncIO *IO)
 672 {
 673         SmtpOutMsg *Msg = IO->Data;
 674         Msg->MyQEntry->Status = 4;
 675         EVS_syslog(LOG_DEBUG, "SMTP: %s\n", __FUNCTION__);
 676         return FailOneAttempt(IO);
 677 }
 678 eNextState SMTP_C_Shutdown(AsyncIO *IO)
 679 {
 680         EVS_syslog(LOG_DEBUG, "SMTP: %s\n", __FUNCTION__);
 681         SmtpOutMsg *Msg = IO->Data;
 682
 683         Msg->MyQEntry->Status = 3;
 684         StrBufPlain(Msg->MyQEntry->StatusMessage,
 685                     HKEY("server shutdown during message submit."));
 686         FinalizeMessageSend(Msg);
 687         return eAbort;
 688 }
 689
 690
 691 /**
 692  * @brief lineread Handler;
 693  * understands when to read more SMTP lines, and when this is a one-lined reply.
 694  */
 695 eReadState SMTP_C_ReadServerStatus(AsyncIO *IO)
 696 {
 697         eReadState Finished = eBufferNotEmpty;
 698
 699         while (Finished == eBufferNotEmpty) {
 700                 Finished = StrBufChunkSipLine(IO->IOBuf, &IO->RecvBuf);
 701
 702                 switch (Finished) {
 703                 case eMustReadMore: /// read new from socket...
 704                         return Finished;
 705                         break;
 706                 case eBufferNotEmpty: /* shouldn't happen... */
 707                 case eReadSuccess: /// done for now...
 708                         if (StrLength(IO->IOBuf) < 4)
 709                                 continue;
 710                         if (ChrPtr(IO->IOBuf)[3] == '-')
 711                                 Finished = eBufferNotEmpty;
 712                         else
 713                                 return Finished;
 714                         break;
 715                 case eReadFail: /// WHUT?
 716                         ///todo: shut down!
 717                         break;
 718                 }
 719         }
 720         return Finished;
 721 }
 722
 723 CTDL_MODULE_INIT(smtp_eventclient)
 724 {
 725         return "smtpeventclient";
 726 }