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         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->MyQItem->QueMsgID =
 167                         CtdlSubmitMsg(msg, NULL, SMTP_SPOOLOUT_ROOM, QP_EADDR);
 168                 EVS_syslog(LOG_DEBUG, "SMTPQ: %ld", Msg->MyQItem->QueMsgID);
 169                 CtdlFreeMessage(msg);
 170         }
 171         else {
 172                 CtdlDeleteMessages(SMTP_SPOOLOUT_ROOM,
 173                                    &Msg->MyQItem->MessageID,
 174                                    1,
 175                                    "");
 176                 FreeStrBuf(&MsgData);
 177         }
 178         RemoveContext(Msg->IO.CitContext);
 179         if (IDestructQueItem)
 180                 RemoveQItem(Msg->MyQItem);
 181         DeleteSmtpOutMsg(Msg);
 182 }
 183
 184 eNextState FailOneAttempt(AsyncIO *IO)
 185 {
 186         SmtpOutMsg *Msg = IO->Data;
 187
 188         if (Msg->MyQEntry->Status == 2)
 189                 return eAbort;
 190
 191         /*
 192          * possible ways here:
 193          * - connection timeout
 194          * - dns lookup failed
 195          */
 196         StopClientWatchers(IO);
 197
 198         if (Msg->pCurrRelay != NULL)
 199                 Msg->pCurrRelay = Msg->pCurrRelay->Next;
 200
 201         if (Msg->pCurrRelay == NULL) {
 202                 EVS_syslog(LOG_DEBUG, "SMTP: %s Aborting\n", __FUNCTION__);
 203                 return eAbort;
 204         }
 205         if (Msg->pCurrRelay->IsIP) {
 206                 EVS_syslog(LOG_DEBUG, "SMTP: %s connecting IP\n", __FUNCTION__);
 207                 return mx_connect_ip(IO);
 208         }
 209         else {
 210                 EVS_syslog(LOG_DEBUG,
 211                            "SMTP: %s resolving next MX Record\n",
 212                            __FUNCTION__);
 213                 return get_one_mx_host_ip(IO);
 214         }
 215 }
 216
 217
 218 void SetConnectStatus(AsyncIO *IO)
 219 {
 220         SmtpOutMsg *Msg = IO->Data;
 221         char buf[256];
 222         void *src;
 223
 224         buf[0] = '\0';
 225
 226         if (IO->ConnectMe->IPv6) {
 227                 src = &IO->ConnectMe->Addr.sin6_addr;
 228         }
 229         else {
 230                 struct sockaddr_in *addr;
 231
 232                 addr = (struct sockaddr_in *)&IO->ConnectMe->Addr;
 233                 src = &addr->sin_addr.s_addr;
 234         }
 235
 236         inet_ntop((IO->ConnectMe->IPv6)?AF_INET6:AF_INET,
 237                   src,
 238                   buf,
 239                   sizeof(buf));
 240
 241         if (Msg->mx_host == NULL)
 242                 Msg->mx_host = "<no MX-Record>";
 243
 244         EVS_syslog(LOG_DEBUG,
 245                   "SMTP client[%ld]: connecting to %s [%s]:%d ...\n",
 246                   Msg->n,
 247                   Msg->mx_host,
 248                   buf,
 249                   Msg->IO.ConnectMe->Port);
 250
 251         Msg->MyQEntry->Status = 5;
 252         StrBufPrintf(Msg->MyQEntry->StatusMessage,
 253                      "Timeout while connecting %s [%s]:%d ",
 254                      Msg->mx_host,
 255                      buf,
 256                      Msg->IO.ConnectMe->Port);
 257         Msg->IO.NextState = eConnect;
 258 }
 259
 260 /*****************************************************************************
 261  * So we connect our Relay IP here.                                          *
 262  *****************************************************************************/
 263 eNextState mx_connect_ip(AsyncIO *IO)
 264 {
 265         SmtpOutMsg *Msg = IO->Data;
 266
 267         EVS_syslog(LOG_DEBUG, "SMTP: %s\n", __FUNCTION__);
 268
 269         IO->ConnectMe = Msg->pCurrRelay;
 270         Msg->State = eConnectMX;
 271
 272         SetConnectStatus(IO);
 273
 274         return EvConnectSock(IO,
 275                              SMTP_C_ConnTimeout,
 276                              SMTP_C_ReadTimeouts[0],
 277                              1);
 278 }
 279
 280 eNextState get_one_mx_host_ip_done(AsyncIO *IO)
 281 {
 282         SmtpOutMsg *Msg = IO->Data;
 283         struct hostent *hostent;
 284
 285         QueryCbDone(IO);
 286
 287         hostent = Msg->HostLookup.VParsedDNSReply;
 288         if ((Msg->HostLookup.DNSStatus == ARES_SUCCESS) &&
 289             (hostent != NULL) ) {
 290                 memset(&Msg->pCurrRelay->Addr, 0, sizeof(struct in6_addr));
 291                 if (Msg->pCurrRelay->IPv6) {
 292                         memcpy(&Msg->pCurrRelay->Addr.sin6_addr.s6_addr,
 293                                &hostent->h_addr_list[0],
 294                                sizeof(struct in6_addr));
 295
 296                         Msg->pCurrRelay->Addr.sin6_family =
 297                                 hostent->h_addrtype;
 298                         Msg->pCurrRelay->Addr.sin6_port =
 299                                 htons(DefaultMXPort);
 300                 }
 301                 else {
 302                         struct sockaddr_in *addr;
 303                         /*
 304                          * Bypass the ns lookup result like this:
 305                          * IO->Addr.sin_addr.s_addr = inet_addr("127.0.0.1");
 306                          * addr->sin_addr.s_addr =
 307                          *   htonl((uint32_t)&hostent->h_addr_list[0]);
 308                          */
 309
 310                         addr = (struct sockaddr_in*) &Msg->pCurrRelay->Addr;
 311
 312                         memcpy(&addr->sin_addr.s_addr,
 313                                hostent->h_addr_list[0],
 314                                sizeof(uint32_t));
 315
 316                         addr->sin_family = hostent->h_addrtype;
 317                         addr->sin_port   = htons(DefaultMXPort);
 318                 }
 319                 Msg->mx_host = Msg->pCurrRelay->Host;
 320                 return mx_connect_ip(IO);
 321         }
 322         else
 323                 return FailOneAttempt(IO);
 324 }
 325
 326 eNextState get_one_mx_host_ip(AsyncIO *IO)
 327 {
 328         SmtpOutMsg * Msg = IO->Data;
 329         /*
 330          * here we start with the lookup of one host. it might be...
 331          * - the relay host *sigh*
 332          * - the direct hostname if there was no mx record
 333          * - one of the mx'es
 334          */
 335
 336         InitC_ares_dns(IO);
 337
 338         EVS_syslog(LOG_DEBUG, "SMTP: %s\n", __FUNCTION__);
 339
 340         EVS_syslog(LOG_DEBUG,
 341                   "SMTP client[%ld]: looking up %s-Record %s : %d ...\n",
 342                   Msg->n,
 343                   (Msg->pCurrRelay->IPv6)? "aaaa": "a",
 344                   Msg->pCurrRelay->Host,
 345                   Msg->pCurrRelay->Port);
 346
 347         if (!QueueQuery((Msg->pCurrRelay->IPv6)? ns_t_aaaa : ns_t_a,
 348                         Msg->pCurrRelay->Host,
 349                         &Msg->IO,
 350                         &Msg->HostLookup,
 351                         get_one_mx_host_ip_done))
 352         {
 353                 Msg->MyQEntry->Status = 5;
 354                 StrBufPrintf(Msg->MyQEntry->StatusMessage,
 355                              "No MX hosts found for <%s>", Msg->node);
 356                 Msg->IO.NextState = eTerminateConnection;
 357                 return IO->NextState;
 358         }
 359         IO->NextState = eReadDNSReply;
 360         return IO->NextState;
 361 }
 362
 363
 364 /*****************************************************************************
 365  * here we try to find out about the MX records for our recipients.          *
 366  *****************************************************************************/
 367 eNextState smtp_resolve_mx_record_done(AsyncIO *IO)
 368 {
 369         SmtpOutMsg * Msg = IO->Data;
 370         ParsedURL **pp;
 371
 372         QueryCbDone(IO);
 373
 374         EVS_syslog(LOG_DEBUG, "SMTP: %s\n", __FUNCTION__);
 375         pp = &Msg->Relay;
 376         while ((pp != NULL) && (*pp != NULL) && ((*pp)->Next != NULL))
 377                 pp = &(*pp)->Next;
 378
 379         if ((IO->DNS.Query->DNSStatus == ARES_SUCCESS) &&
 380             (IO->DNS.Query->VParsedDNSReply != NULL))
 381         { /* ok, we found mx records. */
 382                 Msg->IO.ErrMsg = Msg->MyQEntry->StatusMessage;
 383
 384                 Msg->CurrMX
 385                         = Msg->AllMX
 386                         = IO->DNS.Query->VParsedDNSReply;
 387                 while (Msg->CurrMX) {
 388                         int i;
 389                         for (i = 0; i < 2; i++) {
 390                                 ParsedURL *p;
 391
 392                                 p = (ParsedURL*) malloc(sizeof(ParsedURL));
 393                                 memset(p, 0, sizeof(ParsedURL));
 394                                 p->IsIP = 0;
 395                                 p->Port = DefaultMXPort;
 396                                 p->IPv6 = i == 1;
 397                                 p->Host = Msg->CurrMX->host;
 398
 399                                 *pp = p;
 400                                 pp = &p->Next;
 401                         }
 402                         Msg->CurrMX    = Msg->CurrMX->next;
 403                 }
 404                 Msg->CXFlags   = Msg->CXFlags & F_HAVE_MX;
 405         }
 406         else { /* else fall back to the plain hostname */
 407                 int i;
 408                 for (i = 0; i < 2; i++) {
 409                         ParsedURL *p;
 410
 411                         p = (ParsedURL*) malloc(sizeof(ParsedURL));
 412                         memset(p, 0, sizeof(ParsedURL));
 413                         p->IsIP = 0;
 414                         p->Port = DefaultMXPort;
 415                         p->IPv6 = i == 1;
 416                         p->Host = Msg->node;
 417
 418                         *pp = p;
 419                         pp = &p->Next;
 420                 }
 421                 Msg->CXFlags   = Msg->CXFlags & F_DIRECT;
 422         }
 423         *pp = Msg->MyQItem->FallBackHost;
 424         Msg->pCurrRelay = Msg->Relay;
 425         return get_one_mx_host_ip(IO);
 426 }
 427
 428 eNextState resolve_mx_records(AsyncIO *IO)
 429 {
 430         SmtpOutMsg * Msg = IO->Data;
 431
 432         EVS_syslog(LOG_DEBUG, "SMTP: %s\n", __FUNCTION__);
 433         /* start resolving MX records here. */
 434         if (!QueueQuery(ns_t_mx,
 435                         Msg->node,
 436                         &Msg->IO,
 437                         &Msg->MxLookup,
 438                         smtp_resolve_mx_record_done))
 439         {
 440                 Msg->MyQEntry->Status = 5;
 441                 StrBufPrintf(Msg->MyQEntry->StatusMessage,
 442                              "No MX hosts found for <%s>", Msg->node);
 443                 return IO->NextState;
 444         }
 445         Msg->IO.NextState = eReadDNSReply;
 446         return IO->NextState;
 447 }
 448
 449
 450
 451 /******************************************************************************
 452  *  so, we're going to start a SMTP delivery.  lets get it on.                *
 453  ******************************************************************************/
 454
 455 SmtpOutMsg *new_smtp_outmsg(OneQueItem *MyQItem,
 456                             MailQEntry *MyQEntry,
 457                             int MsgCount)
 458 {
 459         SmtpOutMsg * Msg;
 460
 461         Msg = (SmtpOutMsg *) malloc(sizeof(SmtpOutMsg));
 462         memset(Msg, 0, sizeof(SmtpOutMsg));
 463
 464         Msg->n                = MsgCount;
 465         Msg->MyQEntry         = MyQEntry;
 466         Msg->MyQItem          = MyQItem;
 467         Msg->pCurrRelay       = MyQItem->URL;
 468
 469         InitIOStruct(&Msg->IO,
 470                      Msg,
 471                      eReadMessage,
 472                      SMTP_C_ReadServerStatus,
 473                      SMTP_C_DNSFail,
 474                      SMTP_C_DispatchWriteDone,
 475                      SMTP_C_DispatchReadDone,
 476                      SMTP_C_Terminate,
 477                      SMTP_C_ConnFail,
 478                      SMTP_C_Timeout,
 479                      SMTP_C_Shutdown);
 480
 481         return Msg;
 482 }
 483
 484 void smtp_try_one_queue_entry(OneQueItem *MyQItem,
 485                               MailQEntry *MyQEntry,
 486                               StrBuf *MsgText,
 487                         /*KeepMsgText allows us to use MsgText as ours.*/
 488                               int KeepMsgText,
 489                               int MsgCount)
 490 {
 491         SmtpOutMsg *Msg;
 492
 493         syslog(LOG_DEBUG, "SMTP: %s\n", __FUNCTION__);
 494
 495         Msg = new_smtp_outmsg(MyQItem, MyQEntry, MsgCount);
 496         if (KeepMsgText) Msg->msgtext = MsgText;
 497         else             Msg->msgtext = NewStrBufDup(MsgText);
 498
 499         if (smtp_resolve_recipients(Msg)) {
 500
 501                 safestrncpy(
 502                         ((CitContext *)Msg->IO.CitContext)->cs_host,
 503                         Msg->node,
 504                         sizeof(((CitContext *)
 505                                 Msg->IO.CitContext)->cs_host));
 506
 507                 syslog(LOG_DEBUG, "SMTP Starting: [%ld] <%s> CC <%d> \n",
 508                        Msg->MyQItem->MessageID,
 509                        ChrPtr(Msg->MyQEntry->Recipient),
 510                        ((CitContext*)Msg->IO.CitContext)->cs_pid);
 511                 if (Msg->pCurrRelay == NULL)
 512                         QueueEventContext(&Msg->IO,
 513                                           resolve_mx_records);
 514                 else { /* oh... via relay host */
 515                         if (Msg->pCurrRelay->IsIP) {
 516                                 QueueEventContext(&Msg->IO,
 517                                                   mx_connect_ip);
 518                         }
 519                         else {
 520                                 /* uneducated admin has chosen to
 521                                    add DNS to the equation... */
 522                                 QueueEventContext(&Msg->IO,
 523                                                   get_one_mx_host_ip);
 524                         }
 525                 }
 526         }
 527         else {
 528                 /* No recipients? well fail then. */
 529                 if ((Msg==NULL) ||
 530                     (Msg->MyQEntry == NULL)) {
 531                         Msg->MyQEntry->Status = 5;
 532                         StrBufPlain(Msg->MyQEntry->StatusMessage,
 533                                     HKEY("Invalid Recipient!"));
 534                 }
 535                 FinalizeMessageSend(Msg);
 536         }
 537 }
 538
 539
 540
 541
 542
 543
 544 /*****************************************************************************/
 545 /*                     SMTP CLIENT DISPATCHER                                */
 546 /*****************************************************************************/
 547
 548 void SMTPSetTimeout(eNextState NextTCPState, SmtpOutMsg *Msg)
 549 {
 550         double Timeout = 0.0;
 551         AsyncIO *IO = &Msg->IO;
 552
 553         EVS_syslog(LOG_DEBUG, "SMTP: %s\n", __FUNCTION__);
 554
 555         switch (NextTCPState) {
 556         case eSendFile:
 557         case eSendReply:
 558         case eSendMore:
 559                 Timeout = SMTP_C_SendTimeouts[Msg->State];
 560                 if (Msg->State == eDATABody) {
 561                         /* if we're sending a huge message,
 562                          * we need more time.
 563                          */
 564                         Timeout += StrLength(Msg->msgtext) / 1024;
 565                 }
 566                 break;
 567         case eReadMessage:
 568                 Timeout = SMTP_C_ReadTimeouts[Msg->State];
 569                 if (Msg->State == eDATATerminateBody) {
 570                         /*
 571                          * some mailservers take a nap before accepting
 572                          * the message content inspection and such.
 573                          */
 574                         Timeout += StrLength(Msg->msgtext) / 1024;
 575                 }
 576                 break;
 577         case eSendDNSQuery:
 578         case eReadDNSReply:
 579         case eDBQuery:
 580         case eReadFile:
 581         case eReadMore:
 582         case eReadPayload:
 583         case eConnect:
 584         case eTerminateConnection:
 585         case eAbort:
 586                 return;
 587         }
 588         SetNextTimeout(&Msg->IO, Timeout);
 589 }
 590 eNextState SMTP_C_DispatchReadDone(AsyncIO *IO)
 591 {
 592         EVS_syslog(LOG_DEBUG, "SMTP: %s\n", __FUNCTION__);
 593         SmtpOutMsg *Msg = IO->Data;
 594         eNextState rc;
 595
 596         rc = ReadHandlers[Msg->State](Msg);
 597         if (rc != eAbort)
 598         {
 599                 Msg->State++;
 600                 SMTPSetTimeout(rc, Msg);
 601         }
 602         return rc;
 603 }
 604 eNextState SMTP_C_DispatchWriteDone(AsyncIO *IO)
 605 {
 606         EVS_syslog(LOG_DEBUG, "SMTP: %s\n", __FUNCTION__);
 607         SmtpOutMsg *Msg = IO->Data;
 608         eNextState rc;
 609
 610         rc = SendHandlers[Msg->State](Msg);
 611         SMTPSetTimeout(rc, Msg);
 612         return rc;
 613 }
 614
 615
 616 /*****************************************************************************/
 617 /*                     SMTP CLIENT ERROR CATCHERS                            */
 618 /*****************************************************************************/
 619 eNextState SMTP_C_Terminate(AsyncIO *IO)
 620 {
 621         SmtpOutMsg *Msg = IO->Data;
 622
 623         EVS_syslog(LOG_DEBUG, "SMTP: %s\n", __FUNCTION__);
 624         FinalizeMessageSend(Msg);
 625         return eAbort;
 626 }
 627 eNextState SMTP_C_Timeout(AsyncIO *IO)
 628 {
 629         SmtpOutMsg *Msg = IO->Data;
 630
 631         Msg->MyQEntry->Status = 4;
 632         EVS_syslog(LOG_DEBUG, "SMTP: %s\n", __FUNCTION__);
 633         StrBufPlain(IO->ErrMsg, CKEY(ReadErrors[Msg->State]));
 634         return FailOneAttempt(IO);
 635 }
 636 eNextState SMTP_C_ConnFail(AsyncIO *IO)
 637 {
 638         SmtpOutMsg *Msg = IO->Data;
 639
 640         Msg->MyQEntry->Status = 4;
 641         EVS_syslog(LOG_DEBUG, "SMTP: %s\n", __FUNCTION__);
 642         StrBufPlain(IO->ErrMsg, CKEY(ReadErrors[Msg->State]));
 643         return FailOneAttempt(IO);
 644 }
 645 eNextState SMTP_C_DNSFail(AsyncIO *IO)
 646 {
 647         SmtpOutMsg *Msg = IO->Data;
 648         Msg->MyQEntry->Status = 4;
 649         EVS_syslog(LOG_DEBUG, "SMTP: %s\n", __FUNCTION__);
 650         return FailOneAttempt(IO);
 651 }
 652 eNextState SMTP_C_Shutdown(AsyncIO *IO)
 653 {
 654         EVS_syslog(LOG_DEBUG, "SMTP: %s\n", __FUNCTION__);
 655         SmtpOutMsg *Msg = IO->Data;
 656
 657         Msg->MyQEntry->Status = 3;
 658         StrBufPlain(Msg->MyQEntry->StatusMessage,
 659                     HKEY("server shutdown during message submit."));
 660         FinalizeMessageSend(Msg);
 661         return eAbort;
 662 }
 663
 664
 665 /**
 666  * @brief lineread Handler;
 667  * understands when to read more SMTP lines, and when this is a one-lined reply.
 668  */
 669 eReadState SMTP_C_ReadServerStatus(AsyncIO *IO)
 670 {
 671         eReadState Finished = eBufferNotEmpty;
 672
 673         while (Finished == eBufferNotEmpty) {
 674                 Finished = StrBufChunkSipLine(IO->IOBuf, &IO->RecvBuf);
 675
 676                 switch (Finished) {
 677                 case eMustReadMore: /// read new from socket...
 678                         return Finished;
 679                         break;
 680                 case eBufferNotEmpty: /* shouldn't happen... */
 681                 case eReadSuccess: /// done for now...
 682                         if (StrLength(IO->IOBuf) < 4)
 683                                 continue;
 684                         if (ChrPtr(IO->IOBuf)[3] == '-')
 685                                 Finished = eBufferNotEmpty;
 686                         else
 687                                 return Finished;
 688                         break;
 689                 case eReadFail: /// WHUT?
 690                         ///todo: shut down!
 691                         break;
 692                 }
 693         }
 694         return Finished;
 695 }
 696
 697 CTDL_MODULE_INIT(smtp_eventclient)
 698 {
 699         return "smtpeventclient";
 700 }