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 eNextState SMTP_C_TerminateDB(AsyncIO *IO);
 121 eReadState SMTP_C_ReadServerStatus(AsyncIO *IO);
 122
 123 eNextState mx_connect_ip(AsyncIO *IO);
 124 eNextState get_one_mx_host_ip(AsyncIO *IO);
 125 eNextState FinalizeMessageSendDB(AsyncIO *IO);
 126 eNextState FinalizeMessageSend_DB1(AsyncIO *IO);
 127 eNextState FinalizeMessageSend_DB2(AsyncIO *IO);
 128 eNextState FinalizeMessageSend_DB3(AsyncIO *IO);
 129
 130 /******************************************************************************
 131  * So, we're finished with sending (regardless of success or failure)         *
 132  * This Message might be referenced by several Queue-Items, if we're the last,*
 133  * we need to free the memory and send bounce messages (on terminal failure)  *
 134  * else we just free our SMTP-Message struct.                                 *
 135  ******************************************************************************/
 136 inline void FinalizeMessageSend_1(AsyncIO *IO)
 137 {
 138         SmtpOutMsg *Msg = IO->Data;
 139         Msg->IDestructQueItem = DecreaseQReference(Msg->MyQItem);
 140
 141         Msg->nRemain = CountActiveQueueEntries(Msg->MyQItem);
 142
 143         if (Msg->MyQEntry->Active &&
 144             CheckQEntryIsBounce(Msg->MyQEntry))
 145         {
 146                 /* are we casue for a bounce mail? */
 147                 Msg->MyQItem->SendBounceMail |= (1<<Msg->MyQEntry->Status);
 148         }
 149
 150         if ((Msg->nRemain > 0) || Msg->IDestructQueItem)
 151                 Msg->QMsgData = SerializeQueueItem(Msg->MyQItem);
 152         else
 153                 Msg->QMsgData = NULL;
 154 }
 155 eNextState FinalizeMessageSend(SmtpOutMsg *Msg)
 156 {
 157         return QueueDBOperation(&Msg->IO, FinalizeMessageSend_DB1);
 158 }
 159
 160 inline void FinalizeMessageSend_DB_1(AsyncIO *IO)
 161 {
 162         SmtpOutMsg *Msg = IO->Data;
 163
 164         /*
 165          * Uncompleted delivery instructions remain, so delete the old
 166          * instructions and replace with the updated ones.
 167          */
 168         EVS_syslog(LOG_DEBUG, "SMTPQD: %ld", Msg->MyQItem->QueMsgID);
 169         CtdlDeleteMessages(SMTP_SPOOLOUT_ROOM, &Msg->MyQItem->QueMsgID, 1, "");
 170 }
 171 eNextState FinalizeMessageSend_DB1(AsyncIO *IO)
 172 {
 173         FinalizeMessageSend_1(IO);
 174         FinalizeMessageSend_DB_1(IO);
 175         return NextDBOperation(IO, FinalizeMessageSend_DB2);
 176 }
 177
 178
 179 inline void FinalizeMessageSend_DB_2(AsyncIO *IO)
 180 {
 181         SmtpOutMsg *Msg = IO->Data;
 182
 183         if (Msg->IDestructQueItem)
 184                 smtpq_do_bounce(Msg->MyQItem, Msg->msgtext);
 185 }
 186 eNextState FinalizeMessageSend_DB2(AsyncIO *IO)
 187 {
 188         FinalizeMessageSend_DB_2(IO);
 189
 190         return NextDBOperation(IO, FinalizeMessageSend_DB3);
 191 }
 192
 193
 194 inline void FinalizeMessageSend_DB_3(AsyncIO *IO)
 195 {
 196         SmtpOutMsg *Msg = IO->Data;
 197
 198         if (Msg->nRemain > 0)
 199         {
 200                 struct CtdlMessage *msg;
 201                 msg = malloc(sizeof(struct CtdlMessage));
 202                 memset(msg, 0, sizeof(struct CtdlMessage));
 203                 msg->cm_magic = CTDLMESSAGE_MAGIC;
 204                 msg->cm_anon_type = MES_NORMAL;
 205                 msg->cm_format_type = FMT_RFC822;
 206                 msg->cm_fields['M'] = SmashStrBuf(&Msg->QMsgData);
 207                 msg->cm_fields['U'] = strdup("QMSG");
 208                 Msg->MyQItem->QueMsgID =
 209                         CtdlSubmitMsg(msg, NULL, SMTP_SPOOLOUT_ROOM, QP_EADDR);
 210                 EVS_syslog(LOG_DEBUG, "SMTPQ: %ld", Msg->MyQItem->QueMsgID);
 211                 CtdlFreeMessage(msg);
 212         }
 213         else {
 214                 CtdlDeleteMessages(SMTP_SPOOLOUT_ROOM,
 215                                    &Msg->MyQItem->MessageID,
 216                                    1,
 217                                    "");
 218                 FreeStrBuf(&Msg->QMsgData);
 219         }
 220 }
 221 eNextState FinalizeMessageSend_DB3(AsyncIO *IO)
 222 {
 223         FinalizeMessageSend_DB_3(IO);
 224         return eAbort;
 225 }
 226
 227 eNextState FinalizeMessageSend_DB(AsyncIO *IO)
 228 {
 229         SmtpOutMsg *Msg = IO->Data;
 230
 231         RemoveContext(Msg->IO.CitContext);
 232         if (Msg->IDestructQueItem)
 233                 RemoveQItem(Msg->MyQItem);
 234         DeleteSmtpOutMsg(Msg);
 235         return eAbort;
 236 }
 237
 238 eNextState FailOneAttempt(AsyncIO *IO)
 239 {
 240         SmtpOutMsg *Msg = IO->Data;
 241
 242         if (Msg->MyQEntry->Status == 2)
 243                 return eAbort;
 244
 245         /*
 246          * possible ways here:
 247          * - connection timeout
 248          * - dns lookup failed
 249          */
 250         StopClientWatchers(IO);
 251
 252         if (Msg->pCurrRelay != NULL)
 253                 Msg->pCurrRelay = Msg->pCurrRelay->Next;
 254
 255         if (Msg->pCurrRelay == NULL) {
 256                 EVS_syslog(LOG_DEBUG, "SMTP: %s Aborting\n", __FUNCTION__);
 257                 return eAbort;
 258         }
 259         if (Msg->pCurrRelay->IsIP) {
 260                 EVS_syslog(LOG_DEBUG, "SMTP: %s connecting IP\n", __FUNCTION__);
 261                 return mx_connect_ip(IO);
 262         }
 263         else {
 264                 EVS_syslog(LOG_DEBUG,
 265                            "SMTP: %s resolving next MX Record\n",
 266                            __FUNCTION__);
 267                 return get_one_mx_host_ip(IO);
 268         }
 269 }
 270
 271
 272 void SetConnectStatus(AsyncIO *IO)
 273 {
 274         SmtpOutMsg *Msg = IO->Data;
 275         char buf[256];
 276         void *src;
 277
 278         buf[0] = '\0';
 279
 280         if (IO->ConnectMe->IPv6) {
 281                 src = &IO->ConnectMe->Addr.sin6_addr;
 282         }
 283         else {
 284                 struct sockaddr_in *addr;
 285
 286                 addr = (struct sockaddr_in *)&IO->ConnectMe->Addr;
 287                 src = &addr->sin_addr.s_addr;
 288         }
 289
 290         inet_ntop((IO->ConnectMe->IPv6)?AF_INET6:AF_INET,
 291                   src,
 292                   buf,
 293                   sizeof(buf));
 294
 295         if (Msg->mx_host == NULL)
 296                 Msg->mx_host = "<no MX-Record>";
 297
 298         EVS_syslog(LOG_DEBUG,
 299                   "SMTP client[%ld]: connecting to %s [%s]:%d ...\n",
 300                   Msg->n,
 301                   Msg->mx_host,
 302                   buf,
 303                   Msg->IO.ConnectMe->Port);
 304
 305         Msg->MyQEntry->Status = 5;
 306         StrBufPrintf(Msg->MyQEntry->StatusMessage,
 307                      "Timeout while connecting %s [%s]:%d ",
 308                      Msg->mx_host,
 309                      buf,
 310                      Msg->IO.ConnectMe->Port);
 311         Msg->IO.NextState = eConnect;
 312 }
 313
 314 /*****************************************************************************
 315  * So we connect our Relay IP here.                                          *
 316  *****************************************************************************/
 317 eNextState mx_connect_ip(AsyncIO *IO)
 318 {
 319         SmtpOutMsg *Msg = IO->Data;
 320
 321         EVS_syslog(LOG_DEBUG, "SMTP: %s\n", __FUNCTION__);
 322
 323         IO->ConnectMe = Msg->pCurrRelay;
 324         Msg->State = eConnectMX;
 325
 326         SetConnectStatus(IO);
 327
 328         return EvConnectSock(IO,
 329                              SMTP_C_ConnTimeout,
 330                              SMTP_C_ReadTimeouts[0],
 331                              1);
 332 }
 333
 334 eNextState get_one_mx_host_ip_done(AsyncIO *IO)
 335 {
 336         SmtpOutMsg *Msg = IO->Data;
 337         struct hostent *hostent;
 338
 339         QueryCbDone(IO);
 340
 341         hostent = Msg->HostLookup.VParsedDNSReply;
 342         if ((Msg->HostLookup.DNSStatus == ARES_SUCCESS) &&
 343             (hostent != NULL) ) {
 344                 memset(&Msg->pCurrRelay->Addr, 0, sizeof(struct in6_addr));
 345                 if (Msg->pCurrRelay->IPv6) {
 346                         memcpy(&Msg->pCurrRelay->Addr.sin6_addr.s6_addr,
 347                                &hostent->h_addr_list[0],
 348                                sizeof(struct in6_addr));
 349
 350                         Msg->pCurrRelay->Addr.sin6_family =
 351                                 hostent->h_addrtype;
 352                         Msg->pCurrRelay->Addr.sin6_port =
 353                                 htons(DefaultMXPort);
 354                 }
 355                 else {
 356                         struct sockaddr_in *addr;
 357                         /*
 358                          * Bypass the ns lookup result like this:
 359                          * IO->Addr.sin_addr.s_addr = inet_addr("127.0.0.1");
 360                          * addr->sin_addr.s_addr =
 361                          *   htonl((uint32_t)&hostent->h_addr_list[0]);
 362                          */
 363
 364                         addr = (struct sockaddr_in*) &Msg->pCurrRelay->Addr;
 365
 366                         memcpy(&addr->sin_addr.s_addr,
 367                                hostent->h_addr_list[0],
 368                                sizeof(uint32_t));
 369
 370                         addr->sin_family = hostent->h_addrtype;
 371                         addr->sin_port   = htons(DefaultMXPort);
 372                 }
 373                 Msg->mx_host = Msg->pCurrRelay->Host;
 374                 return mx_connect_ip(IO);
 375         }
 376         else
 377                 return FailOneAttempt(IO);
 378 }
 379
 380 eNextState get_one_mx_host_ip(AsyncIO *IO)
 381 {
 382         SmtpOutMsg * Msg = IO->Data;
 383         /*
 384          * here we start with the lookup of one host. it might be...
 385          * - the relay host *sigh*
 386          * - the direct hostname if there was no mx record
 387          * - one of the mx'es
 388          */
 389
 390         InitC_ares_dns(IO);
 391
 392         EVS_syslog(LOG_DEBUG, "SMTP: %s\n", __FUNCTION__);
 393
 394         EVS_syslog(LOG_DEBUG,
 395                   "SMTP client[%ld]: looking up %s-Record %s : %d ...\n",
 396                   Msg->n,
 397                   (Msg->pCurrRelay->IPv6)? "aaaa": "a",
 398                   Msg->pCurrRelay->Host,
 399                   Msg->pCurrRelay->Port);
 400
 401         if (!QueueQuery((Msg->pCurrRelay->IPv6)? ns_t_aaaa : ns_t_a,
 402                         Msg->pCurrRelay->Host,
 403                         &Msg->IO,
 404                         &Msg->HostLookup,
 405                         get_one_mx_host_ip_done))
 406         {
 407                 Msg->MyQEntry->Status = 5;
 408                 StrBufPrintf(Msg->MyQEntry->StatusMessage,
 409                              "No MX hosts found for <%s>", Msg->node);
 410                 Msg->IO.NextState = eTerminateConnection;
 411                 return IO->NextState;
 412         }
 413         IO->NextState = eReadDNSReply;
 414         return IO->NextState;
 415 }
 416
 417
 418 /*****************************************************************************
 419  * here we try to find out about the MX records for our recipients.          *
 420  *****************************************************************************/
 421 eNextState smtp_resolve_mx_record_done(AsyncIO *IO)
 422 {
 423         SmtpOutMsg * Msg = IO->Data;
 424         ParsedURL **pp;
 425
 426         QueryCbDone(IO);
 427
 428         EVS_syslog(LOG_DEBUG, "SMTP: %s\n", __FUNCTION__);
 429
 430         pp = &Msg->Relay;
 431         while ((pp != NULL) && (*pp != NULL) && ((*pp)->Next != NULL))
 432                 pp = &(*pp)->Next;
 433
 434         if ((IO->DNS.Query->DNSStatus == ARES_SUCCESS) &&
 435             (IO->DNS.Query->VParsedDNSReply != NULL))
 436         { /* ok, we found mx records. */
 437
 438                 Msg->CurrMX
 439                         = Msg->AllMX
 440                         = IO->DNS.Query->VParsedDNSReply;
 441                 while (Msg->CurrMX) {
 442                         int i;
 443                         for (i = 0; i < 2; i++) {
 444                                 ParsedURL *p;
 445
 446                                 p = (ParsedURL*) malloc(sizeof(ParsedURL));
 447                                 memset(p, 0, sizeof(ParsedURL));
 448                                 p->Priority = Msg->CurrMX->priority;
 449                                 p->IsIP = 0;
 450                                 p->Port = DefaultMXPort;
 451                                 p->IPv6 = i == 1;
 452                                 p->Host = Msg->CurrMX->host;
 453                                 if (*pp == NULL)
 454                                         *pp = p;
 455                                 else {
 456                                         ParsedURL *ppp = *pp;
 457
 458                                         while ((ppp->Next != NULL) &&
 459                                                (ppp->Next->Priority <= p->Priority))
 460                                                ppp = ppp->Next;
 461                                         if ((ppp == *pp) &&
 462                                             (ppp->Priority > p->Priority)) {
 463                                                 p->Next = *pp;
 464                                                 *pp = p;
 465                                         }
 466                                         else {
 467                                                 p->Next = ppp->Next;
 468                                                 ppp->Next = p;
 469                                         }
 470                                 }
 471                         }
 472                         Msg->CurrMX    = Msg->CurrMX->next;
 473                 }
 474                 Msg->CXFlags   = Msg->CXFlags & F_HAVE_MX;
 475         }
 476         else { /* else fall back to the plain hostname */
 477                 int i;
 478                 for (i = 0; i < 2; i++) {
 479                         ParsedURL *p;
 480
 481                         p = (ParsedURL*) malloc(sizeof(ParsedURL));
 482                         memset(p, 0, sizeof(ParsedURL));
 483                         p->IsIP = 0;
 484                         p->Port = DefaultMXPort;
 485                         p->IPv6 = i == 1;
 486                         p->Host = Msg->node;
 487
 488                         *pp = p;
 489                         pp = &p->Next;
 490                 }
 491                 Msg->CXFlags   = Msg->CXFlags & F_DIRECT;
 492         }
 493         if (Msg->MyQItem->FallBackHost != NULL)
 494         {
 495                 Msg->MyQItem->FallBackHost->Next = *pp;
 496                 *pp = Msg->MyQItem->FallBackHost;
 497         }
 498         Msg->pCurrRelay = Msg->Relay;
 499         return get_one_mx_host_ip(IO);
 500 }
 501
 502 eNextState resolve_mx_records(AsyncIO *IO)
 503 {
 504         SmtpOutMsg * Msg = IO->Data;
 505
 506         EVS_syslog(LOG_DEBUG, "SMTP: %s\n", __FUNCTION__);
 507         /* start resolving MX records here. */
 508         if (!QueueQuery(ns_t_mx,
 509                         Msg->node,
 510                         &Msg->IO,
 511                         &Msg->MxLookup,
 512                         smtp_resolve_mx_record_done))
 513         {
 514                 Msg->MyQEntry->Status = 5;
 515                 StrBufPrintf(Msg->MyQEntry->StatusMessage,
 516                              "No MX hosts found for <%s>", Msg->node);
 517                 return IO->NextState;
 518         }
 519         Msg->IO.NextState = eReadDNSReply;
 520         return IO->NextState;
 521 }
 522
 523
 524
 525 /******************************************************************************
 526  *  so, we're going to start a SMTP delivery.  lets get it on.                *
 527  ******************************************************************************/
 528
 529 SmtpOutMsg *new_smtp_outmsg(OneQueItem *MyQItem,
 530                             MailQEntry *MyQEntry,
 531                             int MsgCount)
 532 {
 533         SmtpOutMsg * Msg;
 534
 535         Msg = (SmtpOutMsg *) malloc(sizeof(SmtpOutMsg));
 536         memset(Msg, 0, sizeof(SmtpOutMsg));
 537
 538         Msg->n                = MsgCount;
 539         Msg->MyQEntry         = MyQEntry;
 540         Msg->MyQItem          = MyQItem;
 541         Msg->pCurrRelay       = MyQItem->URL;
 542
 543         InitIOStruct(&Msg->IO,
 544                      Msg,
 545                      eReadMessage,
 546                      SMTP_C_ReadServerStatus,
 547                      SMTP_C_DNSFail,
 548                      SMTP_C_DispatchWriteDone,
 549                      SMTP_C_DispatchReadDone,
 550                      SMTP_C_Terminate,
 551                      SMTP_C_TerminateDB,
 552                      SMTP_C_ConnFail,
 553                      SMTP_C_Timeout,
 554                      SMTP_C_Shutdown);
 555
 556         Msg->IO.ErrMsg = Msg->MyQEntry->StatusMessage;
 557
 558         return Msg;
 559 }
 560
 561 void smtp_try_one_queue_entry(OneQueItem *MyQItem,
 562                               MailQEntry *MyQEntry,
 563                               StrBuf *MsgText,
 564                         /*KeepMsgText allows us to use MsgText as ours.*/
 565                               int KeepMsgText,
 566                               int MsgCount)
 567 {
 568         SmtpOutMsg *Msg;
 569
 570         syslog(LOG_DEBUG, "SMTP: %s\n", __FUNCTION__);
 571
 572         Msg = new_smtp_outmsg(MyQItem, MyQEntry, MsgCount);
 573         if (KeepMsgText) Msg->msgtext = MsgText;
 574         else             Msg->msgtext = NewStrBufDup(MsgText);
 575
 576         if (smtp_resolve_recipients(Msg)) {
 577
 578                 safestrncpy(
 579                         ((CitContext *)Msg->IO.CitContext)->cs_host,
 580                         Msg->node,
 581                         sizeof(((CitContext *)
 582                                 Msg->IO.CitContext)->cs_host));
 583
 584                 syslog(LOG_DEBUG, "SMTP Starting: [%ld] <%s> CC <%d> \n",
 585                        Msg->MyQItem->MessageID,
 586                        ChrPtr(Msg->MyQEntry->Recipient),
 587                        ((CitContext*)Msg->IO.CitContext)->cs_pid);
 588                 if (Msg->pCurrRelay == NULL)
 589                         QueueEventContext(&Msg->IO,
 590                                           resolve_mx_records);
 591                 else { /* oh... via relay host */
 592                         if (Msg->pCurrRelay->IsIP) {
 593                                 QueueEventContext(&Msg->IO,
 594                                                   mx_connect_ip);
 595                         }
 596                         else {
 597                                 /* uneducated admin has chosen to
 598                                    add DNS to the equation... */
 599                                 QueueEventContext(&Msg->IO,
 600                                                   get_one_mx_host_ip);
 601                         }
 602                 }
 603         }
 604         else {
 605                 /* No recipients? well fail then. */
 606                 if ((Msg==NULL) ||
 607                     (Msg->MyQEntry == NULL)) {
 608                         Msg->MyQEntry->Status = 5;
 609                         StrBufPlain(Msg->MyQEntry->StatusMessage,
 610                                     HKEY("Invalid Recipient!"));
 611                 }
 612                 FinalizeMessageSend_1(&Msg->IO);
 613                 FinalizeMessageSend_DB_1(&Msg->IO);
 614                 FinalizeMessageSend_DB_2(&Msg->IO);
 615                 FinalizeMessageSend_DB_3(&Msg->IO);
 616                 FinalizeMessageSend_DB(&Msg->IO);
 617         }
 618 }
 619
 620
 621
 622
 623
 624
 625 /*****************************************************************************/
 626 /*                     SMTP CLIENT DISPATCHER                                */
 627 /*****************************************************************************/
 628
 629 void SMTPSetTimeout(eNextState NextTCPState, SmtpOutMsg *Msg)
 630 {
 631         double Timeout = 0.0;
 632         AsyncIO *IO = &Msg->IO;
 633
 634         EVS_syslog(LOG_DEBUG, "SMTP: %s\n", __FUNCTION__);
 635
 636         switch (NextTCPState) {
 637         case eSendFile:
 638         case eSendReply:
 639         case eSendMore:
 640                 Timeout = SMTP_C_SendTimeouts[Msg->State];
 641                 if (Msg->State == eDATABody) {
 642                         /* if we're sending a huge message,
 643                          * we need more time.
 644                          */
 645                         Timeout += StrLength(Msg->msgtext) / 512;
 646                 }
 647                 break;
 648         case eReadMessage:
 649                 Timeout = SMTP_C_ReadTimeouts[Msg->State];
 650                 if (Msg->State == eDATATerminateBody) {
 651                         /*
 652                          * some mailservers take a nap before accepting
 653                          * the message content inspection and such.
 654                          */
 655                         Timeout += StrLength(Msg->msgtext) / 512;
 656                 }
 657                 break;
 658         case eSendDNSQuery:
 659         case eReadDNSReply:
 660         case eDBQuery:
 661         case eReadFile:
 662         case eReadMore:
 663         case eReadPayload:
 664         case eConnect:
 665         case eTerminateConnection:
 666         case eAbort:
 667                 return;
 668         }
 669         SetNextTimeout(&Msg->IO, Timeout);
 670 }
 671 eNextState SMTP_C_DispatchReadDone(AsyncIO *IO)
 672 {
 673         EVS_syslog(LOG_DEBUG, "SMTP: %s\n", __FUNCTION__);
 674         SmtpOutMsg *Msg = IO->Data;
 675         eNextState rc;
 676
 677         rc = ReadHandlers[Msg->State](Msg);
 678         if (rc != eAbort)
 679         {
 680                 Msg->State++;
 681                 SMTPSetTimeout(rc, Msg);
 682         }
 683         return rc;
 684 }
 685 eNextState SMTP_C_DispatchWriteDone(AsyncIO *IO)
 686 {
 687         EVS_syslog(LOG_DEBUG, "SMTP: %s\n", __FUNCTION__);
 688         SmtpOutMsg *Msg = IO->Data;
 689         eNextState rc;
 690
 691         rc = SendHandlers[Msg->State](Msg);
 692         SMTPSetTimeout(rc, Msg);
 693         return rc;
 694 }
 695
 696
 697 /*****************************************************************************/
 698 /*                     SMTP CLIENT ERROR CATCHERS                            */
 699 /*****************************************************************************/
 700 eNextState SMTP_C_Terminate(AsyncIO *IO)
 701 {
 702         SmtpOutMsg *Msg = IO->Data;
 703
 704         EVS_syslog(LOG_DEBUG, "SMTP: %s\n", __FUNCTION__);
 705         return FinalizeMessageSend(Msg);
 706 }
 707 eNextState SMTP_C_TerminateDB(AsyncIO *IO)
 708 {
 709         EVS_syslog(LOG_DEBUG, "SMTP: %s\n", __FUNCTION__);
 710         return FinalizeMessageSend_DB(IO);
 711 }
 712 eNextState SMTP_C_Timeout(AsyncIO *IO)
 713 {
 714         SmtpOutMsg *Msg = IO->Data;
 715
 716         Msg->MyQEntry->Status = 4;
 717         EVS_syslog(LOG_DEBUG, "SMTP: %s\n", __FUNCTION__);
 718         StrBufPlain(IO->ErrMsg, CKEY(ReadErrors[Msg->State]));
 719         if (Msg->State > eRCPT)
 720                 return eAbort;
 721         else
 722                 return FailOneAttempt(IO);
 723 }
 724 eNextState SMTP_C_ConnFail(AsyncIO *IO)
 725 {
 726         SmtpOutMsg *Msg = IO->Data;
 727
 728         Msg->MyQEntry->Status = 4;
 729         EVS_syslog(LOG_DEBUG, "SMTP: %s\n", __FUNCTION__);
 730         StrBufPlain(IO->ErrMsg, CKEY(ReadErrors[Msg->State]));
 731         return FailOneAttempt(IO);
 732 }
 733 eNextState SMTP_C_DNSFail(AsyncIO *IO)
 734 {
 735         SmtpOutMsg *Msg = IO->Data;
 736         Msg->MyQEntry->Status = 4;
 737         EVS_syslog(LOG_DEBUG, "SMTP: %s\n", __FUNCTION__);
 738         return FailOneAttempt(IO);
 739 }
 740 eNextState SMTP_C_Shutdown(AsyncIO *IO)
 741 {
 742         EVS_syslog(LOG_DEBUG, "SMTP: %s\n", __FUNCTION__);
 743         SmtpOutMsg *Msg = IO->Data;
 744
 745         Msg->MyQEntry->Status = 3;
 746         StrBufPlain(Msg->MyQEntry->StatusMessage,
 747                     HKEY("server shutdown during message submit."));
 748         return FinalizeMessageSend(Msg);
 749 }
 750
 751
 752 /**
 753  * @brief lineread Handler;
 754  * understands when to read more SMTP lines, and when this is a one-lined reply.
 755  */
 756 eReadState SMTP_C_ReadServerStatus(AsyncIO *IO)
 757 {
 758         eReadState Finished = eBufferNotEmpty;
 759
 760         while (Finished == eBufferNotEmpty) {
 761                 Finished = StrBufChunkSipLine(IO->IOBuf, &IO->RecvBuf);
 762
 763                 switch (Finished) {
 764                 case eMustReadMore: /// read new from socket...
 765                         return Finished;
 766                         break;
 767                 case eBufferNotEmpty: /* shouldn't happen... */
 768                 case eReadSuccess: /// done for now...
 769                         if (StrLength(IO->IOBuf) < 4)
 770                                 continue;
 771                         if (ChrPtr(IO->IOBuf)[3] == '-')
 772                                 Finished = eBufferNotEmpty;
 773                         else
 774                                 return Finished;
 775                         break;
 776                 case eReadFail: /// WHUT?
 777                         ///todo: shut down!
 778                         break;
 779                 }
 780         }
 781         return Finished;
 782 }
 783
 784 CTDL_MODULE_INIT(smtp_eventclient)
 785 {
 786         return "smtpeventclient";
 787 }