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->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
 376         if ((IO->DNS.Query->DNSStatus == ARES_SUCCESS) &&
 377             (IO->DNS.Query->VParsedDNSReply != NULL))
 378         { /* ok, we found mx records. */
 379
 380                 Msg->CurrMX
 381                         = Msg->AllMX
 382                         = IO->DNS.Query->VParsedDNSReply;
 383                 while (Msg->CurrMX) {
 384                         int i;
 385                         for (i = 0; i < 2; i++) {
 386                                 ParsedURL *p;
 387
 388                                 p = (ParsedURL*) malloc(sizeof(ParsedURL));
 389                                 memset(p, 0, sizeof(ParsedURL));
 390                                 p->Priority = Msg->CurrMX->priority;
 391                                 p->IsIP = 0;
 392                                 p->Port = DefaultMXPort;
 393                                 p->IPv6 = i == 1;
 394                                 p->Host = Msg->CurrMX->host;
 395                                 if (Msg->Relay == NULL)
 396                                         Msg->Relay = p;
 397                                 else {
 398                                         ParsedURL *pp = Msg->Relay;
 399
 400                                         while ((pp->Next != NULL) &&
 401                                                (pp->Next->Priority <= p->Priority))
 402                                                pp = pp->Next;
 403                                         if ((pp == Msg->Relay) &&
 404                                             (pp->Priority > p->Priority)) {
 405                                                 p->Next = Msg->Relay;
 406                                                 Msg->Relay = p;
 407                                         }
 408                                         else {
 409                                                 p->Next = pp->Next;
 410                                                 pp->Next = p;
 411                                         }
 412                                 }
 413                         }
 414                         Msg->CurrMX    = Msg->CurrMX->next;
 415                 }
 416                 Msg->CXFlags   = Msg->CXFlags & F_HAVE_MX;
 417         }
 418         else { /* else fall back to the plain hostname */
 419                 pp = &Msg->Relay;
 420                 while ((pp != NULL) && (*pp != NULL) && ((*pp)->Next != NULL))
 421                         pp = &(*pp)->Next;
 422                 int i;
 423                 for (i = 0; i < 2; i++) {
 424                         ParsedURL *p;
 425
 426                         p = (ParsedURL*) malloc(sizeof(ParsedURL));
 427                         memset(p, 0, sizeof(ParsedURL));
 428                         p->IsIP = 0;
 429                         p->Port = DefaultMXPort;
 430                         p->IPv6 = i == 1;
 431                         p->Host = Msg->node;
 432
 433                         *pp = p;
 434                         pp = &p->Next;
 435                 }
 436                 Msg->CXFlags   = Msg->CXFlags & F_DIRECT;
 437         }
 438         *pp = Msg->MyQItem->FallBackHost;
 439         Msg->pCurrRelay = Msg->Relay;
 440         return get_one_mx_host_ip(IO);
 441 }
 442
 443 eNextState resolve_mx_records(AsyncIO *IO)
 444 {
 445         SmtpOutMsg * Msg = IO->Data;
 446
 447         EVS_syslog(LOG_DEBUG, "SMTP: %s\n", __FUNCTION__);
 448         /* start resolving MX records here. */
 449         if (!QueueQuery(ns_t_mx,
 450                         Msg->node,
 451                         &Msg->IO,
 452                         &Msg->MxLookup,
 453                         smtp_resolve_mx_record_done))
 454         {
 455                 Msg->MyQEntry->Status = 5;
 456                 StrBufPrintf(Msg->MyQEntry->StatusMessage,
 457                              "No MX hosts found for <%s>", Msg->node);
 458                 return IO->NextState;
 459         }
 460         Msg->IO.NextState = eReadDNSReply;
 461         return IO->NextState;
 462 }
 463
 464
 465
 466 /******************************************************************************
 467  *  so, we're going to start a SMTP delivery.  lets get it on.                *
 468  ******************************************************************************/
 469
 470 SmtpOutMsg *new_smtp_outmsg(OneQueItem *MyQItem,
 471                             MailQEntry *MyQEntry,
 472                             int MsgCount)
 473 {
 474         SmtpOutMsg * Msg;
 475
 476         Msg = (SmtpOutMsg *) malloc(sizeof(SmtpOutMsg));
 477         memset(Msg, 0, sizeof(SmtpOutMsg));
 478
 479         Msg->n                = MsgCount;
 480         Msg->MyQEntry         = MyQEntry;
 481         Msg->MyQItem          = MyQItem;
 482         Msg->pCurrRelay       = MyQItem->URL;
 483
 484         InitIOStruct(&Msg->IO,
 485                      Msg,
 486                      eReadMessage,
 487                      SMTP_C_ReadServerStatus,
 488                      SMTP_C_DNSFail,
 489                      SMTP_C_DispatchWriteDone,
 490                      SMTP_C_DispatchReadDone,
 491                      SMTP_C_Terminate,
 492                      SMTP_C_ConnFail,
 493                      SMTP_C_Timeout,
 494                      SMTP_C_Shutdown);
 495
 496         Msg->IO.ErrMsg = Msg->MyQEntry->StatusMessage;
 497
 498         return Msg;
 499 }
 500
 501 void smtp_try_one_queue_entry(OneQueItem *MyQItem,
 502                               MailQEntry *MyQEntry,
 503                               StrBuf *MsgText,
 504                         /*KeepMsgText allows us to use MsgText as ours.*/
 505                               int KeepMsgText,
 506                               int MsgCount)
 507 {
 508         SmtpOutMsg *Msg;
 509
 510         syslog(LOG_DEBUG, "SMTP: %s\n", __FUNCTION__);
 511
 512         Msg = new_smtp_outmsg(MyQItem, MyQEntry, MsgCount);
 513         if (KeepMsgText) Msg->msgtext = MsgText;
 514         else             Msg->msgtext = NewStrBufDup(MsgText);
 515
 516         if (smtp_resolve_recipients(Msg)) {
 517
 518                 safestrncpy(
 519                         ((CitContext *)Msg->IO.CitContext)->cs_host,
 520                         Msg->node,
 521                         sizeof(((CitContext *)
 522                                 Msg->IO.CitContext)->cs_host));
 523
 524                 syslog(LOG_DEBUG, "SMTP Starting: [%ld] <%s> CC <%d> \n",
 525                        Msg->MyQItem->MessageID,
 526                        ChrPtr(Msg->MyQEntry->Recipient),
 527                        ((CitContext*)Msg->IO.CitContext)->cs_pid);
 528                 if (Msg->pCurrRelay == NULL)
 529                         QueueEventContext(&Msg->IO,
 530                                           resolve_mx_records);
 531                 else { /* oh... via relay host */
 532                         if (Msg->pCurrRelay->IsIP) {
 533                                 QueueEventContext(&Msg->IO,
 534                                                   mx_connect_ip);
 535                         }
 536                         else {
 537                                 /* uneducated admin has chosen to
 538                                    add DNS to the equation... */
 539                                 QueueEventContext(&Msg->IO,
 540                                                   get_one_mx_host_ip);
 541                         }
 542                 }
 543         }
 544         else {
 545                 /* No recipients? well fail then. */
 546                 if ((Msg==NULL) ||
 547                     (Msg->MyQEntry == NULL)) {
 548                         Msg->MyQEntry->Status = 5;
 549                         StrBufPlain(Msg->MyQEntry->StatusMessage,
 550                                     HKEY("Invalid Recipient!"));
 551                 }
 552                 FinalizeMessageSend(Msg);
 553         }
 554 }
 555
 556
 557
 558
 559
 560
 561 /*****************************************************************************/
 562 /*                     SMTP CLIENT DISPATCHER                                */
 563 /*****************************************************************************/
 564
 565 void SMTPSetTimeout(eNextState NextTCPState, SmtpOutMsg *Msg)
 566 {
 567         double Timeout = 0.0;
 568         AsyncIO *IO = &Msg->IO;
 569
 570         EVS_syslog(LOG_DEBUG, "SMTP: %s\n", __FUNCTION__);
 571
 572         switch (NextTCPState) {
 573         case eSendFile:
 574         case eSendReply:
 575         case eSendMore:
 576                 Timeout = SMTP_C_SendTimeouts[Msg->State];
 577                 if (Msg->State == eDATABody) {
 578                         /* if we're sending a huge message,
 579                          * we need more time.
 580                          */
 581                         Timeout += StrLength(Msg->msgtext) / 512;
 582                 }
 583                 break;
 584         case eReadMessage:
 585                 Timeout = SMTP_C_ReadTimeouts[Msg->State];
 586                 if (Msg->State == eDATATerminateBody) {
 587                         /*
 588                          * some mailservers take a nap before accepting
 589                          * the message content inspection and such.
 590                          */
 591                         Timeout += StrLength(Msg->msgtext) / 512;
 592                 }
 593                 break;
 594         case eSendDNSQuery:
 595         case eReadDNSReply:
 596         case eDBQuery:
 597         case eReadFile:
 598         case eReadMore:
 599         case eReadPayload:
 600         case eConnect:
 601         case eTerminateConnection:
 602         case eAbort:
 603                 return;
 604         }
 605         SetNextTimeout(&Msg->IO, Timeout);
 606 }
 607 eNextState SMTP_C_DispatchReadDone(AsyncIO *IO)
 608 {
 609         EVS_syslog(LOG_DEBUG, "SMTP: %s\n", __FUNCTION__);
 610         SmtpOutMsg *Msg = IO->Data;
 611         eNextState rc;
 612
 613         rc = ReadHandlers[Msg->State](Msg);
 614         if (rc != eAbort)
 615         {
 616                 Msg->State++;
 617                 SMTPSetTimeout(rc, Msg);
 618         }
 619         return rc;
 620 }
 621 eNextState SMTP_C_DispatchWriteDone(AsyncIO *IO)
 622 {
 623         EVS_syslog(LOG_DEBUG, "SMTP: %s\n", __FUNCTION__);
 624         SmtpOutMsg *Msg = IO->Data;
 625         eNextState rc;
 626
 627         rc = SendHandlers[Msg->State](Msg);
 628         SMTPSetTimeout(rc, Msg);
 629         return rc;
 630 }
 631
 632
 633 /*****************************************************************************/
 634 /*                     SMTP CLIENT ERROR CATCHERS                            */
 635 /*****************************************************************************/
 636 eNextState SMTP_C_Terminate(AsyncIO *IO)
 637 {
 638         SmtpOutMsg *Msg = IO->Data;
 639
 640         EVS_syslog(LOG_DEBUG, "SMTP: %s\n", __FUNCTION__);
 641         FinalizeMessageSend(Msg);
 642         return eAbort;
 643 }
 644 eNextState SMTP_C_Timeout(AsyncIO *IO)
 645 {
 646         SmtpOutMsg *Msg = IO->Data;
 647
 648         Msg->MyQEntry->Status = 4;
 649         EVS_syslog(LOG_DEBUG, "SMTP: %s\n", __FUNCTION__);
 650         StrBufPlain(IO->ErrMsg, CKEY(ReadErrors[Msg->State]));
 651         if (Msg->State > eRCPT)
 652                 return eAbort;
 653         else
 654                 return FailOneAttempt(IO);
 655 }
 656 eNextState SMTP_C_ConnFail(AsyncIO *IO)
 657 {
 658         SmtpOutMsg *Msg = IO->Data;
 659
 660         Msg->MyQEntry->Status = 4;
 661         EVS_syslog(LOG_DEBUG, "SMTP: %s\n", __FUNCTION__);
 662         StrBufPlain(IO->ErrMsg, CKEY(ReadErrors[Msg->State]));
 663         return FailOneAttempt(IO);
 664 }
 665 eNextState SMTP_C_DNSFail(AsyncIO *IO)
 666 {
 667         SmtpOutMsg *Msg = IO->Data;
 668         Msg->MyQEntry->Status = 4;
 669         EVS_syslog(LOG_DEBUG, "SMTP: %s\n", __FUNCTION__);
 670         return FailOneAttempt(IO);
 671 }
 672 eNextState SMTP_C_Shutdown(AsyncIO *IO)
 673 {
 674         EVS_syslog(LOG_DEBUG, "SMTP: %s\n", __FUNCTION__);
 675         SmtpOutMsg *Msg = IO->Data;
 676
 677         Msg->MyQEntry->Status = 3;
 678         StrBufPlain(Msg->MyQEntry->StatusMessage,
 679                     HKEY("server shutdown during message submit."));
 680         FinalizeMessageSend(Msg);
 681         return eAbort;
 682 }
 683
 684
 685 /**
 686  * @brief lineread Handler;
 687  * understands when to read more SMTP lines, and when this is a one-lined reply.
 688  */
 689 eReadState SMTP_C_ReadServerStatus(AsyncIO *IO)
 690 {
 691         eReadState Finished = eBufferNotEmpty;
 692
 693         while (Finished == eBufferNotEmpty) {
 694                 Finished = StrBufChunkSipLine(IO->IOBuf, &IO->RecvBuf);
 695
 696                 switch (Finished) {
 697                 case eMustReadMore: /// read new from socket...
 698                         return Finished;
 699                         break;
 700                 case eBufferNotEmpty: /* shouldn't happen... */
 701                 case eReadSuccess: /// done for now...
 702                         if (StrLength(IO->IOBuf) < 4)
 703                                 continue;
 704                         if (ChrPtr(IO->IOBuf)[3] == '-')
 705                                 Finished = eBufferNotEmpty;
 706                         else
 707                                 return Finished;
 708                         break;
 709                 case eReadFail: /// WHUT?
 710                         ///todo: shut down!
 711                         break;
 712                 }
 713         }
 714         return Finished;
 715 }
 716
 717 CTDL_MODULE_INIT(smtp_eventclient)
 718 {
 719         return "smtpeventclient";
 720 }