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 int SMTPClientDebugEnabled = 0;
  94 const unsigned short DefaultMXPort = 25;
  95 void DeleteSmtpOutMsg(void *v)
  96 {
  97         SmtpOutMsg *Msg = v;
  98         AsyncIO *IO = &Msg->IO;
  99         EVS_syslog(LOG_DEBUG, "%s Exit\n", __FUNCTION__);
 100
 101         /* these are kept in our own space and free'd below */
 102         Msg->IO.ConnectMe = NULL;
 103
 104         ares_free_data(Msg->AllMX);
 105         if (Msg->HostLookup.VParsedDNSReply != NULL)
 106                 Msg->HostLookup.DNSReplyFree(Msg->HostLookup.VParsedDNSReply);
 107         FreeURL(&Msg->Relay);
 108         FreeStrBuf(&Msg->msgtext);
 109         FreeAsyncIOContents(&Msg->IO);
 110         memset (Msg, 0, sizeof(SmtpOutMsg)); /* just to be shure... */
 111         free(Msg);
 112 }
 113
 114 eNextState SMTP_C_Shutdown(AsyncIO *IO);
 115 eNextState SMTP_C_Timeout(AsyncIO *IO);
 116 eNextState SMTP_C_ConnFail(AsyncIO *IO);
 117 eNextState SMTP_C_DispatchReadDone(AsyncIO *IO);
 118 eNextState SMTP_C_DispatchWriteDone(AsyncIO *IO);
 119 eNextState SMTP_C_DNSFail(AsyncIO *IO);
 120 eNextState SMTP_C_Terminate(AsyncIO *IO);
 121 eNextState SMTP_C_TerminateDB(AsyncIO *IO);
 122 eReadState SMTP_C_ReadServerStatus(AsyncIO *IO);
 123
 124 eNextState mx_connect_ip(AsyncIO *IO);
 125 eNextState get_one_mx_host_ip(AsyncIO *IO);
 126
 127 /******************************************************************************
 128  * So, we're finished with sending (regardless of success or failure)         *
 129  * This Message might be referenced by several Queue-Items, if we're the last,*
 130  * we need to free the memory and send bounce messages (on terminal failure)  *
 131  * else we just free our SMTP-Message struct.                                 *
 132  ******************************************************************************/
 133 eNextState FinalizeMessageSend_DB(AsyncIO *IO)
 134 {
 135         const char *Status;
 136         SmtpOutMsg *Msg = IO->Data;
 137
 138         if (Msg->MyQEntry->Status == 2)
 139                 Status = "Delivery successful.";
 140         else if (Msg->MyQEntry->Status == 5)
 141                 Status = "Delivery failed permanently; giving up.";
 142         else
 143                 Status = "Delivery failed temporarily; will retry later.";
 144
 145         EVS_syslog(LOG_INFO,
 146                    "%s Time[%fs] Recipient <%s> @ <%s> (%s) Status message: %s\n",
 147                    Status,
 148                    Msg->IO.Now - Msg->IO.StartIO,
 149                    Msg->user,
 150                    Msg->node,
 151                    Msg->name,
 152                    ChrPtr(Msg->MyQEntry->StatusMessage));
 153
 154
 155         Msg->IDestructQueItem = DecreaseQReference(Msg->MyQItem);
 156
 157         Msg->nRemain = CountActiveQueueEntries(Msg->MyQItem);
 158
 159         if (Msg->MyQEntry->Active &&
 160             CheckQEntryIsBounce(Msg->MyQEntry))
 161         {
 162                 /* are we casue for a bounce mail? */
 163                 Msg->MyQItem->SendBounceMail |= (1<<Msg->MyQEntry->Status);
 164         }
 165
 166         if ((Msg->nRemain > 0) || Msg->IDestructQueItem)
 167                 Msg->QMsgData = SerializeQueueItem(Msg->MyQItem);
 168         else
 169                 Msg->QMsgData = NULL;
 170
 171         /*
 172          * Uncompleted delivery instructions remain, so delete the old
 173          * instructions and replace with the updated ones.
 174          */
 175         EVS_syslog(LOG_DEBUG, "%ld", Msg->MyQItem->QueMsgID);
 176         CtdlDeleteMessages(SMTP_SPOOLOUT_ROOM, &Msg->MyQItem->QueMsgID, 1, "");
 177         Msg->MyQItem->QueMsgID = -1;
 178
 179         if (Msg->IDestructQueItem)
 180                 smtpq_do_bounce(Msg->MyQItem, Msg->msgtext);
 181
 182         if (Msg->nRemain > 0)
 183         {
 184                 struct CtdlMessage *msg;
 185                 msg = malloc(sizeof(struct CtdlMessage));
 186                 memset(msg, 0, sizeof(struct CtdlMessage));
 187                 msg->cm_magic = CTDLMESSAGE_MAGIC;
 188                 msg->cm_anon_type = MES_NORMAL;
 189                 msg->cm_format_type = FMT_RFC822;
 190                 msg->cm_fields['M'] = SmashStrBuf(&Msg->QMsgData);
 191                 msg->cm_fields['U'] = strdup("QMSG");
 192                 Msg->MyQItem->QueMsgID =
 193                         CtdlSubmitMsg(msg, NULL, SMTP_SPOOLOUT_ROOM, QP_EADDR);
 194                 EVS_syslog(LOG_DEBUG, "%ld", Msg->MyQItem->QueMsgID);
 195                 CtdlFreeMessage(msg);
 196         }
 197         else {
 198                 CtdlDeleteMessages(SMTP_SPOOLOUT_ROOM,
 199                                    &Msg->MyQItem->MessageID,
 200                                    1,
 201                                    "");
 202                 FreeStrBuf(&Msg->QMsgData);
 203         }
 204
 205         RemoveContext(Msg->IO.CitContext);
 206         if (Msg->IDestructQueItem)
 207                 RemoveQItem(Msg->MyQItem);
 208         return eAbort;
 209 }
 210
 211 eNextState Terminate(AsyncIO *IO)
 212 {
 213         SmtpOutMsg *Msg = IO->Data;
 214         DeleteSmtpOutMsg(Msg);
 215         return eAbort;
 216 }
 217 eNextState FinalizeMessageSend(SmtpOutMsg *Msg)
 218 {
 219         /* hand over to DB Queue */
 220         return QueueDBOperation(&Msg->IO, FinalizeMessageSend_DB);
 221 }
 222
 223 eNextState FailOneAttempt(AsyncIO *IO)
 224 {
 225         SmtpOutMsg *Msg = IO->Data;
 226
 227         if (Msg->MyQEntry->Status == 2)
 228                 return eAbort;
 229
 230         /*
 231          * possible ways here:
 232          * - connection timeout
 233          * - dns lookup failed
 234          */
 235         StopClientWatchers(IO);
 236
 237         if (Msg->pCurrRelay != NULL)
 238                 Msg->pCurrRelay = Msg->pCurrRelay->Next;
 239
 240         if (Msg->pCurrRelay == NULL) {
 241                 EVS_syslog(LOG_DEBUG, "%s Aborting\n", __FUNCTION__);
 242                 return eAbort;
 243         }
 244         if (Msg->pCurrRelay->IsIP) {
 245                 EVS_syslog(LOG_DEBUG, "%s connecting IP\n", __FUNCTION__);
 246                 return mx_connect_ip(IO);
 247         }
 248         else {
 249                 EVS_syslog(LOG_DEBUG,
 250                            "%s resolving next MX Record\n",
 251                            __FUNCTION__);
 252                 return get_one_mx_host_ip(IO);
 253         }
 254 }
 255
 256
 257 void SetConnectStatus(AsyncIO *IO)
 258 {
 259         SmtpOutMsg *Msg = IO->Data;
 260         char buf[256];
 261         void *src;
 262
 263         buf[0] = '\0';
 264
 265         if (IO->ConnectMe->IPv6) {
 266                 src = &IO->ConnectMe->Addr.sin6_addr;
 267         }
 268         else {
 269                 struct sockaddr_in *addr;
 270
 271                 addr = (struct sockaddr_in *)&IO->ConnectMe->Addr;
 272                 src = &addr->sin_addr.s_addr;
 273         }
 274
 275         inet_ntop((IO->ConnectMe->IPv6)?AF_INET6:AF_INET,
 276                   src,
 277                   buf,
 278                   sizeof(buf));
 279
 280         if (Msg->mx_host == NULL)
 281                 Msg->mx_host = "<no MX-Record>";
 282
 283         EVS_syslog(LOG_INFO,
 284                   "connecting to %s [%s]:%d ...\n",
 285                   Msg->mx_host,
 286                   buf,
 287                   Msg->IO.ConnectMe->Port);
 288
 289         Msg->MyQEntry->Status = 4;
 290         StrBufPrintf(Msg->MyQEntry->StatusMessage,
 291                      "Timeout while connecting %s [%s]:%d ",
 292                      Msg->mx_host,
 293                      buf,
 294                      Msg->IO.ConnectMe->Port);
 295         Msg->IO.NextState = eConnect;
 296 }
 297
 298 /*****************************************************************************
 299  * So we connect our Relay IP here.                                          *
 300  *****************************************************************************/
 301 eNextState mx_connect_ip(AsyncIO *IO)
 302 {
 303         SmtpOutMsg *Msg = IO->Data;
 304
 305         EVS_syslog(LOG_DEBUG, "%s\n", __FUNCTION__);
 306
 307         IO->ConnectMe = Msg->pCurrRelay;
 308         Msg->State = eConnectMX;
 309
 310         SetConnectStatus(IO);
 311
 312         return EvConnectSock(IO,
 313                              SMTP_C_ConnTimeout,
 314                              SMTP_C_ReadTimeouts[0],
 315                              1);
 316 }
 317
 318 eNextState get_one_mx_host_ip_done(AsyncIO *IO)
 319 {
 320         SmtpOutMsg *Msg = IO->Data;
 321         struct hostent *hostent;
 322
 323         QueryCbDone(IO);
 324         EVS_syslog(LOG_DEBUG, "%s Time[%fs]\n",
 325                    __FUNCTION__,
 326                    IO->Now - IO->DNS.Start);
 327
 328         hostent = Msg->HostLookup.VParsedDNSReply;
 329         if ((Msg->HostLookup.DNSStatus == ARES_SUCCESS) &&
 330             (hostent != NULL) ) {
 331                 memset(&Msg->pCurrRelay->Addr, 0, sizeof(struct in6_addr));
 332                 if (Msg->pCurrRelay->IPv6) {
 333                         memcpy(&Msg->pCurrRelay->Addr.sin6_addr.s6_addr,
 334                                &hostent->h_addr_list[0],
 335                                sizeof(struct in6_addr));
 336
 337                         Msg->pCurrRelay->Addr.sin6_family =
 338                                 hostent->h_addrtype;
 339                         Msg->pCurrRelay->Addr.sin6_port =
 340                                 htons(DefaultMXPort);
 341                 }
 342                 else {
 343                         struct sockaddr_in *addr;
 344                         /*
 345                          * Bypass the ns lookup result like this:
 346                          * IO->Addr.sin_addr.s_addr = inet_addr("127.0.0.1");
 347                          * addr->sin_addr.s_addr =
 348                          *   htonl((uint32_t)&hostent->h_addr_list[0]);
 349                          */
 350
 351                         addr = (struct sockaddr_in*) &Msg->pCurrRelay->Addr;
 352
 353                         memcpy(&addr->sin_addr.s_addr,
 354                                hostent->h_addr_list[0],
 355                                sizeof(uint32_t));
 356
 357                         addr->sin_family = hostent->h_addrtype;
 358                         addr->sin_port   = htons(DefaultMXPort);
 359                 }
 360                 Msg->mx_host = Msg->pCurrRelay->Host;
 361                 if (Msg->HostLookup.VParsedDNSReply != NULL) {
 362                         Msg->HostLookup.DNSReplyFree(Msg->HostLookup.VParsedDNSReply);
 363                         Msg->HostLookup.VParsedDNSReply = NULL;
 364                 }
 365                 return mx_connect_ip(IO);
 366         }
 367         else {
 368                 if (Msg->HostLookup.VParsedDNSReply != NULL) {
 369                         Msg->HostLookup.DNSReplyFree(Msg->HostLookup.VParsedDNSReply);
 370                         Msg->HostLookup.VParsedDNSReply = NULL;
 371                 }
 372                 return FailOneAttempt(IO);
 373         }
 374 }
 375
 376 eNextState get_one_mx_host_ip(AsyncIO *IO)
 377 {
 378         SmtpOutMsg * Msg = IO->Data;
 379         /*
 380          * here we start with the lookup of one host. it might be...
 381          * - the relay host *sigh*
 382          * - the direct hostname if there was no mx record
 383          * - one of the mx'es
 384          */
 385
 386         EVS_syslog(LOG_DEBUG, "%s\n", __FUNCTION__);
 387
 388         EVS_syslog(LOG_DEBUG,
 389                   "looking up %s-Record %s : %d ...\n",
 390                   (Msg->pCurrRelay->IPv6)? "aaaa": "a",
 391                   Msg->pCurrRelay->Host,
 392                   Msg->pCurrRelay->Port);
 393
 394         if (!QueueQuery((Msg->pCurrRelay->IPv6)? ns_t_aaaa : ns_t_a,
 395                         Msg->pCurrRelay->Host,
 396                         &Msg->IO,
 397                         &Msg->HostLookup,
 398                         get_one_mx_host_ip_done))
 399         {
 400                 Msg->MyQEntry->Status = 5;
 401                 StrBufPrintf(Msg->MyQEntry->StatusMessage,
 402                              "No MX hosts found for <%s>", Msg->node);
 403                 Msg->IO.NextState = eTerminateConnection;
 404                 return IO->NextState;
 405         }
 406         IO->NextState = eReadDNSReply;
 407         return IO->NextState;
 408 }
 409
 410
 411 /*****************************************************************************
 412  * here we try to find out about the MX records for our recipients.          *
 413  *****************************************************************************/
 414 eNextState smtp_resolve_mx_record_done(AsyncIO *IO)
 415 {
 416         SmtpOutMsg * Msg = IO->Data;
 417         ParsedURL **pp;
 418
 419         QueryCbDone(IO);
 420
 421         EVS_syslog(LOG_DEBUG, "%s Time[%fs]\n",
 422                    __FUNCTION__,
 423                    IO->Now - IO->DNS.Start);
 424
 425         pp = &Msg->Relay;
 426         while ((pp != NULL) && (*pp != NULL) && ((*pp)->Next != NULL))
 427                 pp = &(*pp)->Next;
 428
 429         if ((IO->DNS.Query->DNSStatus == ARES_SUCCESS) &&
 430             (IO->DNS.Query->VParsedDNSReply != NULL))
 431         { /* ok, we found mx records. */
 432
 433                 Msg->CurrMX
 434                         = Msg->AllMX
 435                         = IO->DNS.Query->VParsedDNSReply;
 436                 while (Msg->CurrMX) {
 437                         int i;
 438                         for (i = 0; i < 2; i++) {
 439                                 ParsedURL *p;
 440
 441                                 p = (ParsedURL*) malloc(sizeof(ParsedURL));
 442                                 memset(p, 0, sizeof(ParsedURL));
 443                                 p->Priority = Msg->CurrMX->priority;
 444                                 p->IsIP = 0;
 445                                 p->Port = DefaultMXPort;
 446                                 p->IPv6 = i == 1;
 447                                 p->Host = Msg->CurrMX->host;
 448                                 if (*pp == NULL)
 449                                         *pp = p;
 450                                 else {
 451                                         ParsedURL *ppp = *pp;
 452
 453                                         while ((ppp->Next != NULL) &&
 454                                                (ppp->Next->Priority <= p->Priority))
 455                                                ppp = ppp->Next;
 456                                         if ((ppp == *pp) &&
 457                                             (ppp->Priority > p->Priority)) {
 458                                                 p->Next = *pp;
 459                                                 *pp = p;
 460                                         }
 461                                         else {
 462                                                 p->Next = ppp->Next;
 463                                                 ppp->Next = p;
 464                                         }
 465                                 }
 466                         }
 467                         Msg->CurrMX    = Msg->CurrMX->next;
 468                 }
 469                 Msg->CXFlags   = Msg->CXFlags & F_HAVE_MX;
 470         }
 471         else { /* else fall back to the plain hostname */
 472                 int i;
 473                 for (i = 0; i < 2; i++) {
 474                         ParsedURL *p;
 475
 476                         p = (ParsedURL*) malloc(sizeof(ParsedURL));
 477                         memset(p, 0, sizeof(ParsedURL));
 478                         p->IsIP = 0;
 479                         p->Port = DefaultMXPort;
 480                         p->IPv6 = i == 1;
 481                         p->Host = Msg->node;
 482
 483                         *pp = p;
 484                         pp = &p->Next;
 485                 }
 486                 Msg->CXFlags   = Msg->CXFlags & F_DIRECT;
 487         }
 488         if (Msg->MyQItem->FallBackHost != NULL)
 489         {
 490                 Msg->MyQItem->FallBackHost->Next = *pp;
 491                 *pp = Msg->MyQItem->FallBackHost;
 492         }
 493         Msg->pCurrRelay = Msg->Relay;
 494         return get_one_mx_host_ip(IO);
 495 }
 496
 497 eNextState resolve_mx_records(AsyncIO *IO)
 498 {
 499         SmtpOutMsg * Msg = IO->Data;
 500
 501         EVS_syslog(LOG_DEBUG, "%s\n", __FUNCTION__);
 502         /* start resolving MX records here. */
 503         if (!QueueQuery(ns_t_mx,
 504                         Msg->node,
 505                         &Msg->IO,
 506                         &Msg->MxLookup,
 507                         smtp_resolve_mx_record_done))
 508         {
 509                 Msg->MyQEntry->Status = 5;
 510                 StrBufPrintf(Msg->MyQEntry->StatusMessage,
 511                              "No MX hosts found for <%s>", Msg->node);
 512                 return IO->NextState;
 513         }
 514         Msg->IO.NextState = eReadDNSReply;
 515         return IO->NextState;
 516 }
 517
 518
 519
 520 /******************************************************************************
 521  *  so, we're going to start a SMTP delivery.  lets get it on.                *
 522  ******************************************************************************/
 523
 524 SmtpOutMsg *new_smtp_outmsg(OneQueItem *MyQItem,
 525                             MailQEntry *MyQEntry,
 526                             int MsgCount)
 527 {
 528         SmtpOutMsg * Msg;
 529
 530         Msg = (SmtpOutMsg *) malloc(sizeof(SmtpOutMsg));
 531         memset(Msg, 0, sizeof(SmtpOutMsg));
 532
 533         Msg->n                = MsgCount;
 534         Msg->MyQEntry         = MyQEntry;
 535         Msg->MyQItem          = MyQItem;
 536         Msg->pCurrRelay       = MyQItem->URL;
 537
 538         InitIOStruct(&Msg->IO,
 539                      Msg,
 540                      eReadMessage,
 541                      SMTP_C_ReadServerStatus,
 542                      SMTP_C_DNSFail,
 543                      SMTP_C_DispatchWriteDone,
 544                      SMTP_C_DispatchReadDone,
 545                      SMTP_C_Terminate,
 546                      SMTP_C_TerminateDB,
 547                      SMTP_C_ConnFail,
 548                      SMTP_C_Timeout,
 549                      SMTP_C_Shutdown);
 550
 551         Msg->IO.ErrMsg = Msg->MyQEntry->StatusMessage;
 552
 553         return Msg;
 554 }
 555
 556 void smtp_try_one_queue_entry(OneQueItem *MyQItem,
 557                               MailQEntry *MyQEntry,
 558                               StrBuf *MsgText,
 559                         /*KeepMsgText allows us to use MsgText as ours.*/
 560                               int KeepMsgText,
 561                               int MsgCount)
 562 {
 563         SmtpOutMsg *Msg;
 564
 565         SMTPC_syslog(LOG_DEBUG, "%s\n", __FUNCTION__);
 566
 567         Msg = new_smtp_outmsg(MyQItem, MyQEntry, MsgCount);
 568         if (KeepMsgText) Msg->msgtext = MsgText;
 569         else             Msg->msgtext = NewStrBufDup(MsgText);
 570
 571         if (smtp_resolve_recipients(Msg)) {
 572
 573                 safestrncpy(
 574                         ((CitContext *)Msg->IO.CitContext)->cs_host,
 575                         Msg->node,
 576                         sizeof(((CitContext *)
 577                                 Msg->IO.CitContext)->cs_host));
 578
 579                 SMTPC_syslog(LOG_DEBUG, "Starting: [%ld] <%s> CC <%d> \n",
 580                              Msg->MyQItem->MessageID,
 581                              ChrPtr(Msg->MyQEntry->Recipient),
 582                              ((CitContext*)Msg->IO.CitContext)->cs_pid);
 583                 if (Msg->pCurrRelay == NULL)
 584                         QueueEventContext(&Msg->IO,
 585                                           resolve_mx_records);
 586                 else { /* oh... via relay host */
 587                         if (Msg->pCurrRelay->IsIP) {
 588                                 QueueEventContext(&Msg->IO,
 589                                                   mx_connect_ip);
 590                         }
 591                         else {
 592                                 /* uneducated admin has chosen to
 593                                    add DNS to the equation... */
 594                                 QueueEventContext(&Msg->IO,
 595                                                   get_one_mx_host_ip);
 596                         }
 597                 }
 598         }
 599         else {
 600                 /* No recipients? well fail then. */
 601                 if ((Msg==NULL) ||
 602                     (Msg->MyQEntry == NULL)) {
 603                         Msg->MyQEntry->Status = 5;
 604                         StrBufPlain(Msg->MyQEntry->StatusMessage,
 605                                     HKEY("Invalid Recipient!"));
 606                 }
 607                 FinalizeMessageSend_DB(&Msg->IO);
 608                 DeleteSmtpOutMsg(&Msg->IO);
 609         }
 610 }
 611
 612
 613
 614
 615
 616
 617 /*****************************************************************************/
 618 /*                     SMTP CLIENT DISPATCHER                                */
 619 /*****************************************************************************/
 620
 621 void SMTPSetTimeout(eNextState NextTCPState, SmtpOutMsg *Msg)
 622 {
 623         double Timeout = 0.0;
 624         AsyncIO *IO = &Msg->IO;
 625
 626         EVS_syslog(LOG_DEBUG, "%s\n", __FUNCTION__);
 627
 628         switch (NextTCPState) {
 629         case eSendFile:
 630         case eSendReply:
 631         case eSendMore:
 632                 Timeout = SMTP_C_SendTimeouts[Msg->State];
 633                 if (Msg->State == eDATABody) {
 634                         /* if we're sending a huge message,
 635                          * we need more time.
 636                          */
 637                         Timeout += StrLength(Msg->msgtext) / 512;
 638                 }
 639                 break;
 640         case eReadMessage:
 641                 Timeout = SMTP_C_ReadTimeouts[Msg->State];
 642                 if (Msg->State == eDATATerminateBody) {
 643                         /*
 644                          * some mailservers take a nap before accepting
 645                          * the message content inspection and such.
 646                          */
 647                         Timeout += StrLength(Msg->msgtext) / 512;
 648                 }
 649                 break;
 650         case eSendDNSQuery:
 651         case eReadDNSReply:
 652         case eDBQuery:
 653         case eReadFile:
 654         case eReadMore:
 655         case eReadPayload:
 656         case eConnect:
 657         case eTerminateConnection:
 658         case eAbort:
 659                 return;
 660         }
 661         SetNextTimeout(&Msg->IO, Timeout);
 662 }
 663 eNextState SMTP_C_DispatchReadDone(AsyncIO *IO)
 664 {
 665         EVS_syslog(LOG_DEBUG, "%s\n", __FUNCTION__);
 666         SmtpOutMsg *Msg = IO->Data;
 667         eNextState rc;
 668
 669         rc = ReadHandlers[Msg->State](Msg);
 670         if (rc != eAbort)
 671         {
 672                 Msg->State++;
 673                 SMTPSetTimeout(rc, Msg);
 674         }
 675         return rc;
 676 }
 677 eNextState SMTP_C_DispatchWriteDone(AsyncIO *IO)
 678 {
 679         EVS_syslog(LOG_DEBUG, "%s\n", __FUNCTION__);
 680         SmtpOutMsg *Msg = IO->Data;
 681         eNextState rc;
 682
 683         rc = SendHandlers[Msg->State](Msg);
 684         SMTPSetTimeout(rc, Msg);
 685         return rc;
 686 }
 687
 688
 689 /*****************************************************************************/
 690 /*                     SMTP CLIENT ERROR CATCHERS                            */
 691 /*****************************************************************************/
 692 eNextState SMTP_C_Terminate(AsyncIO *IO)
 693 {
 694         SmtpOutMsg *Msg = IO->Data;
 695
 696         EVS_syslog(LOG_DEBUG, "%s\n", __FUNCTION__);
 697         return FinalizeMessageSend(Msg);
 698 }
 699 eNextState SMTP_C_TerminateDB(AsyncIO *IO)
 700 {
 701         EVS_syslog(LOG_DEBUG, "%s\n", __FUNCTION__);
 702         return Terminate(IO);
 703 }
 704 eNextState SMTP_C_Timeout(AsyncIO *IO)
 705 {
 706         SmtpOutMsg *Msg = IO->Data;
 707
 708         Msg->MyQEntry->Status = 4;
 709         EVS_syslog(LOG_DEBUG, "%s\n", __FUNCTION__);
 710         StrBufPlain(IO->ErrMsg, CKEY(ReadErrors[Msg->State]));
 711         if (Msg->State > eRCPT)
 712                 return eAbort;
 713         else
 714                 return FailOneAttempt(IO);
 715 }
 716 eNextState SMTP_C_ConnFail(AsyncIO *IO)
 717 {
 718         SmtpOutMsg *Msg = IO->Data;
 719
 720         Msg->MyQEntry->Status = 4;
 721         EVS_syslog(LOG_DEBUG, "%s\n", __FUNCTION__);
 722         StrBufPlain(IO->ErrMsg, CKEY(ReadErrors[Msg->State]));
 723         return FailOneAttempt(IO);
 724 }
 725 eNextState SMTP_C_DNSFail(AsyncIO *IO)
 726 {
 727         SmtpOutMsg *Msg = IO->Data;
 728         Msg->MyQEntry->Status = 4;
 729         EVS_syslog(LOG_DEBUG, "%s\n", __FUNCTION__);
 730         return FailOneAttempt(IO);
 731 }
 732 eNextState SMTP_C_Shutdown(AsyncIO *IO)
 733 {
 734         EVS_syslog(LOG_DEBUG, "%s\n", __FUNCTION__);
 735         SmtpOutMsg *Msg = IO->Data;
 736
 737         Msg->MyQEntry->Status = 3;
 738         StrBufPlain(Msg->MyQEntry->StatusMessage,
 739                     HKEY("server shutdown during message submit."));
 740         return FinalizeMessageSend(Msg);
 741 }
 742
 743
 744 /**
 745  * @brief lineread Handler;
 746  * understands when to read more SMTP lines, and when this is a one-lined reply.
 747  */
 748 eReadState SMTP_C_ReadServerStatus(AsyncIO *IO)
 749 {
 750         eReadState Finished = eBufferNotEmpty;
 751
 752         while (Finished == eBufferNotEmpty) {
 753                 Finished = StrBufChunkSipLine(IO->IOBuf, &IO->RecvBuf);
 754
 755                 switch (Finished) {
 756                 case eMustReadMore: /// read new from socket...
 757                         return Finished;
 758                         break;
 759                 case eBufferNotEmpty: /* shouldn't happen... */
 760                 case eReadSuccess: /// done for now...
 761                         if (StrLength(IO->IOBuf) < 4)
 762                                 continue;
 763                         if (ChrPtr(IO->IOBuf)[3] == '-')
 764                                 Finished = eBufferNotEmpty;
 765                         else
 766                                 return Finished;
 767                         break;
 768                 case eReadFail: /// WHUT?
 769                         ///todo: shut down!
 770                         break;
 771                 }
 772         }
 773         return Finished;
 774 }
 775
 776 void LogDebugEnableSMTPClient(const int n)
 777 {
 778         SMTPClientDebugEnabled = n;
 779 }
 780
 781 CTDL_MODULE_INIT(smtp_eventclient)
 782 {
 783         if (!threading)
 784                 CtdlRegisterDebugFlagHook(HKEY("smtpeventclient"), LogDebugEnableSMTPClient, &SMTPClientDebugEnabled);
 785         return "smtpeventclient";
 786 }