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 eNextState FinalizeMessageSendDB(AsyncIO *IO);
 127 eNextState FinalizeMessageSend_DB1(AsyncIO *IO);
 128 eNextState FinalizeMessageSend_DB2(AsyncIO *IO);
 129 eNextState FinalizeMessageSend_DB3(AsyncIO *IO);
 130 eNextState FinalizeMessageSend_DB4(AsyncIO *IO);
 131
 132 /******************************************************************************
 133  * So, we're finished with sending (regardless of success or failure)         *
 134  * This Message might be referenced by several Queue-Items, if we're the last,*
 135  * we need to free the memory and send bounce messages (on terminal failure)  *
 136  * else we just free our SMTP-Message struct.                                 *
 137  ******************************************************************************/
 138 inline void FinalizeMessageSend_1(AsyncIO *IO)
 139 {
 140         const char *Status;
 141         SmtpOutMsg *Msg = IO->Data;
 142
 143         if (Msg->MyQEntry->Status == 2)
 144                 Status = "Delivery successful.";
 145         else if (Msg->MyQEntry->Status == 5)
 146                 Status = "Delivery failed permanently; giving up.";
 147         else
 148                 Status = "Delivery failed temporarily; will retry later.";
 149
 150         EVS_syslog(LOG_INFO,
 151                    "%s Time[%fs] Recipient <%s> @ <%s> (%s) Status message: %s\n",
 152                    Status,
 153                    Msg->IO.Now - Msg->IO.StartIO,
 154                    Msg->user,
 155                    Msg->node,
 156                    Msg->name,
 157                    ChrPtr(Msg->MyQEntry->StatusMessage));
 158
 159
 160         Msg->IDestructQueItem = DecreaseQReference(Msg->MyQItem);
 161
 162         Msg->nRemain = CountActiveQueueEntries(Msg->MyQItem);
 163
 164         if (Msg->MyQEntry->Active &&
 165             CheckQEntryIsBounce(Msg->MyQEntry))
 166         {
 167                 /* are we casue for a bounce mail? */
 168                 Msg->MyQItem->SendBounceMail |= (1<<Msg->MyQEntry->Status);
 169         }
 170
 171         if ((Msg->nRemain > 0) || Msg->IDestructQueItem)
 172                 Msg->QMsgData = SerializeQueueItem(Msg->MyQItem);
 173         else
 174                 Msg->QMsgData = NULL;
 175 }
 176 eNextState FinalizeMessageSend(SmtpOutMsg *Msg)
 177 {
 178         return QueueDBOperation(&Msg->IO, FinalizeMessageSend_DB1);
 179 }
 180
 181 inline void FinalizeMessageSend_DB_1(AsyncIO *IO)
 182 {
 183         SmtpOutMsg *Msg = IO->Data;
 184
 185         /*
 186          * Uncompleted delivery instructions remain, so delete the old
 187          * instructions and replace with the updated ones.
 188          */
 189         EVS_syslog(LOG_DEBUG, "%ld", Msg->MyQItem->QueMsgID);
 190         CtdlDeleteMessages(SMTP_SPOOLOUT_ROOM, &Msg->MyQItem->QueMsgID, 1, "");
 191 }
 192 eNextState FinalizeMessageSend_DB1(AsyncIO *IO)
 193 {
 194         FinalizeMessageSend_1(IO);
 195         FinalizeMessageSend_DB_1(IO);
 196         return NextDBOperation(IO, FinalizeMessageSend_DB2);
 197 }
 198
 199
 200 inline void FinalizeMessageSend_DB_2(AsyncIO *IO)
 201 {
 202         SmtpOutMsg *Msg = IO->Data;
 203
 204         if (Msg->IDestructQueItem)
 205                 smtpq_do_bounce(Msg->MyQItem, Msg->msgtext);
 206 }
 207 eNextState FinalizeMessageSend_DB2(AsyncIO *IO)
 208 {
 209         FinalizeMessageSend_DB_2(IO);
 210
 211         return NextDBOperation(IO, FinalizeMessageSend_DB3);
 212 }
 213
 214
 215 inline void FinalizeMessageSend_DB_3(AsyncIO *IO)
 216 {
 217         SmtpOutMsg *Msg = IO->Data;
 218
 219         if (Msg->nRemain > 0)
 220         {
 221                 struct CtdlMessage *msg;
 222                 msg = malloc(sizeof(struct CtdlMessage));
 223                 memset(msg, 0, sizeof(struct CtdlMessage));
 224                 msg->cm_magic = CTDLMESSAGE_MAGIC;
 225                 msg->cm_anon_type = MES_NORMAL;
 226                 msg->cm_format_type = FMT_RFC822;
 227                 msg->cm_fields['M'] = SmashStrBuf(&Msg->QMsgData);
 228                 msg->cm_fields['U'] = strdup("QMSG");
 229                 Msg->MyQItem->QueMsgID =
 230                         CtdlSubmitMsg(msg, NULL, SMTP_SPOOLOUT_ROOM, QP_EADDR);
 231                 EVS_syslog(LOG_DEBUG, "%ld", Msg->MyQItem->QueMsgID);
 232                 CtdlFreeMessage(msg);
 233         }
 234         else {
 235                 CtdlDeleteMessages(SMTP_SPOOLOUT_ROOM,
 236                                    &Msg->MyQItem->MessageID,
 237                                    1,
 238                                    "");
 239                 FreeStrBuf(&Msg->QMsgData);
 240         }
 241         DecreaseShutdownDeliveries(Msg->MyQItem);
 242 }
 243 eNextState FinalizeMessageSend_DB3(AsyncIO *IO)
 244 {
 245         SmtpOutMsg *Msg = IO->Data;
 246         FinalizeMessageSend_DB_3(IO);
 247         if (!Msg->IDestructQueItem)
 248                 return eAbort;
 249         return NextDBOperation(IO, FinalizeMessageSend_DB4);
 250 }
 251
 252 eNextState FinalizeMessageSend_DB4(AsyncIO *IO)
 253 {
 254         int Done;
 255         SmtpOutMsg *Msg = IO->Data;
 256
 257         Done = GetShutdownDeliveries(Msg->MyQItem);
 258         if (!Done)
 259                 return NextDBOperation(IO, FinalizeMessageSend_DB4);
 260         else
 261                 return eAbort;
 262 }
 263
 264 eNextState FinalizeMessageSend_DB(AsyncIO *IO)
 265 {
 266         SmtpOutMsg *Msg = IO->Data;
 267
 268         RemoveContext(Msg->IO.CitContext);
 269         if (Msg->IDestructQueItem)
 270                 RemoveQItem(Msg->MyQItem);
 271         DeleteSmtpOutMsg(Msg);
 272         return eAbort;
 273 }
 274
 275 eNextState FailOneAttempt(AsyncIO *IO)
 276 {
 277         SmtpOutMsg *Msg = IO->Data;
 278
 279         if (Msg->MyQEntry->Status == 2)
 280                 return eAbort;
 281
 282         /*
 283          * possible ways here:
 284          * - connection timeout
 285          * - dns lookup failed
 286          */
 287         StopClientWatchers(IO);
 288
 289         if (Msg->pCurrRelay != NULL)
 290                 Msg->pCurrRelay = Msg->pCurrRelay->Next;
 291
 292         if (Msg->pCurrRelay == NULL) {
 293                 EVS_syslog(LOG_DEBUG, "%s Aborting\n", __FUNCTION__);
 294                 return eAbort;
 295         }
 296         if (Msg->pCurrRelay->IsIP) {
 297                 EVS_syslog(LOG_DEBUG, "%s connecting IP\n", __FUNCTION__);
 298                 return mx_connect_ip(IO);
 299         }
 300         else {
 301                 EVS_syslog(LOG_DEBUG,
 302                            "%s resolving next MX Record\n",
 303                            __FUNCTION__);
 304                 return get_one_mx_host_ip(IO);
 305         }
 306 }
 307
 308
 309 void SetConnectStatus(AsyncIO *IO)
 310 {
 311         SmtpOutMsg *Msg = IO->Data;
 312         char buf[256];
 313         void *src;
 314
 315         buf[0] = '\0';
 316
 317         if (IO->ConnectMe->IPv6) {
 318                 src = &IO->ConnectMe->Addr.sin6_addr;
 319         }
 320         else {
 321                 struct sockaddr_in *addr;
 322
 323                 addr = (struct sockaddr_in *)&IO->ConnectMe->Addr;
 324                 src = &addr->sin_addr.s_addr;
 325         }
 326
 327         inet_ntop((IO->ConnectMe->IPv6)?AF_INET6:AF_INET,
 328                   src,
 329                   buf,
 330                   sizeof(buf));
 331
 332         if (Msg->mx_host == NULL)
 333                 Msg->mx_host = "<no MX-Record>";
 334
 335         EVS_syslog(LOG_INFO,
 336                   "connecting to %s [%s]:%d ...\n",
 337                   Msg->mx_host,
 338                   buf,
 339                   Msg->IO.ConnectMe->Port);
 340
 341         Msg->MyQEntry->Status = 4;
 342         StrBufPrintf(Msg->MyQEntry->StatusMessage,
 343                      "Timeout while connecting %s [%s]:%d ",
 344                      Msg->mx_host,
 345                      buf,
 346                      Msg->IO.ConnectMe->Port);
 347         Msg->IO.NextState = eConnect;
 348 }
 349
 350 /*****************************************************************************
 351  * So we connect our Relay IP here.                                          *
 352  *****************************************************************************/
 353 eNextState mx_connect_ip(AsyncIO *IO)
 354 {
 355         SmtpOutMsg *Msg = IO->Data;
 356
 357         EVS_syslog(LOG_DEBUG, "%s\n", __FUNCTION__);
 358
 359         IO->ConnectMe = Msg->pCurrRelay;
 360         Msg->State = eConnectMX;
 361
 362         SetConnectStatus(IO);
 363
 364         return EvConnectSock(IO,
 365                              SMTP_C_ConnTimeout,
 366                              SMTP_C_ReadTimeouts[0],
 367                              1);
 368 }
 369
 370 eNextState get_one_mx_host_ip_done(AsyncIO *IO)
 371 {
 372         SmtpOutMsg *Msg = IO->Data;
 373         struct hostent *hostent;
 374
 375         QueryCbDone(IO);
 376         EVS_syslog(LOG_DEBUG, "%s Time[%fs]\n",
 377                    __FUNCTION__,
 378                    IO->Now - IO->DNS.Start);
 379
 380         hostent = Msg->HostLookup.VParsedDNSReply;
 381         if ((Msg->HostLookup.DNSStatus == ARES_SUCCESS) &&
 382             (hostent != NULL) ) {
 383                 memset(&Msg->pCurrRelay->Addr, 0, sizeof(struct in6_addr));
 384                 if (Msg->pCurrRelay->IPv6) {
 385                         memcpy(&Msg->pCurrRelay->Addr.sin6_addr.s6_addr,
 386                                &hostent->h_addr_list[0],
 387                                sizeof(struct in6_addr));
 388
 389                         Msg->pCurrRelay->Addr.sin6_family =
 390                                 hostent->h_addrtype;
 391                         Msg->pCurrRelay->Addr.sin6_port =
 392                                 htons(DefaultMXPort);
 393                 }
 394                 else {
 395                         struct sockaddr_in *addr;
 396                         /*
 397                          * Bypass the ns lookup result like this:
 398                          * IO->Addr.sin_addr.s_addr = inet_addr("127.0.0.1");
 399                          * addr->sin_addr.s_addr =
 400                          *   htonl((uint32_t)&hostent->h_addr_list[0]);
 401                          */
 402
 403                         addr = (struct sockaddr_in*) &Msg->pCurrRelay->Addr;
 404
 405                         memcpy(&addr->sin_addr.s_addr,
 406                                hostent->h_addr_list[0],
 407                                sizeof(uint32_t));
 408
 409                         addr->sin_family = hostent->h_addrtype;
 410                         addr->sin_port   = htons(DefaultMXPort);
 411                 }
 412                 Msg->mx_host = Msg->pCurrRelay->Host;
 413                 if (Msg->HostLookup.VParsedDNSReply != NULL) {
 414                         Msg->HostLookup.DNSReplyFree(Msg->HostLookup.VParsedDNSReply);
 415                         Msg->HostLookup.VParsedDNSReply = NULL;
 416                 }
 417                 return mx_connect_ip(IO);
 418         }
 419         else {
 420                 if (Msg->HostLookup.VParsedDNSReply != NULL) {
 421                         Msg->HostLookup.DNSReplyFree(Msg->HostLookup.VParsedDNSReply);
 422                         Msg->HostLookup.VParsedDNSReply = NULL;
 423                 }
 424                 return FailOneAttempt(IO);
 425         }
 426 }
 427
 428 eNextState get_one_mx_host_ip(AsyncIO *IO)
 429 {
 430         SmtpOutMsg * Msg = IO->Data;
 431         /*
 432          * here we start with the lookup of one host. it might be...
 433          * - the relay host *sigh*
 434          * - the direct hostname if there was no mx record
 435          * - one of the mx'es
 436          */
 437
 438         EVS_syslog(LOG_DEBUG, "%s\n", __FUNCTION__);
 439
 440         EVS_syslog(LOG_DEBUG,
 441                   "looking up %s-Record %s : %d ...\n",
 442                   (Msg->pCurrRelay->IPv6)? "aaaa": "a",
 443                   Msg->pCurrRelay->Host,
 444                   Msg->pCurrRelay->Port);
 445
 446         if (!QueueQuery((Msg->pCurrRelay->IPv6)? ns_t_aaaa : ns_t_a,
 447                         Msg->pCurrRelay->Host,
 448                         &Msg->IO,
 449                         &Msg->HostLookup,
 450                         get_one_mx_host_ip_done))
 451         {
 452                 Msg->MyQEntry->Status = 5;
 453                 StrBufPrintf(Msg->MyQEntry->StatusMessage,
 454                              "No MX hosts found for <%s>", Msg->node);
 455                 Msg->IO.NextState = eTerminateConnection;
 456                 return IO->NextState;
 457         }
 458         IO->NextState = eReadDNSReply;
 459         return IO->NextState;
 460 }
 461
 462
 463 /*****************************************************************************
 464  * here we try to find out about the MX records for our recipients.          *
 465  *****************************************************************************/
 466 eNextState smtp_resolve_mx_record_done(AsyncIO *IO)
 467 {
 468         SmtpOutMsg * Msg = IO->Data;
 469         ParsedURL **pp;
 470
 471         QueryCbDone(IO);
 472
 473         EVS_syslog(LOG_DEBUG, "%s Time[%fs]\n",
 474                    __FUNCTION__,
 475                    IO->Now - IO->DNS.Start);
 476
 477         pp = &Msg->Relay;
 478         while ((pp != NULL) && (*pp != NULL) && ((*pp)->Next != NULL))
 479                 pp = &(*pp)->Next;
 480
 481         if ((IO->DNS.Query->DNSStatus == ARES_SUCCESS) &&
 482             (IO->DNS.Query->VParsedDNSReply != NULL))
 483         { /* ok, we found mx records. */
 484
 485                 Msg->CurrMX
 486                         = Msg->AllMX
 487                         = IO->DNS.Query->VParsedDNSReply;
 488                 while (Msg->CurrMX) {
 489                         int i;
 490                         for (i = 0; i < 2; i++) {
 491                                 ParsedURL *p;
 492
 493                                 p = (ParsedURL*) malloc(sizeof(ParsedURL));
 494                                 memset(p, 0, sizeof(ParsedURL));
 495                                 p->Priority = Msg->CurrMX->priority;
 496                                 p->IsIP = 0;
 497                                 p->Port = DefaultMXPort;
 498                                 p->IPv6 = i == 1;
 499                                 p->Host = Msg->CurrMX->host;
 500                                 if (*pp == NULL)
 501                                         *pp = p;
 502                                 else {
 503                                         ParsedURL *ppp = *pp;
 504
 505                                         while ((ppp->Next != NULL) &&
 506                                                (ppp->Next->Priority <= p->Priority))
 507                                                ppp = ppp->Next;
 508                                         if ((ppp == *pp) &&
 509                                             (ppp->Priority > p->Priority)) {
 510                                                 p->Next = *pp;
 511                                                 *pp = p;
 512                                         }
 513                                         else {
 514                                                 p->Next = ppp->Next;
 515                                                 ppp->Next = p;
 516                                         }
 517                                 }
 518                         }
 519                         Msg->CurrMX    = Msg->CurrMX->next;
 520                 }
 521                 Msg->CXFlags   = Msg->CXFlags & F_HAVE_MX;
 522         }
 523         else { /* else fall back to the plain hostname */
 524                 int i;
 525                 for (i = 0; i < 2; i++) {
 526                         ParsedURL *p;
 527
 528                         p = (ParsedURL*) malloc(sizeof(ParsedURL));
 529                         memset(p, 0, sizeof(ParsedURL));
 530                         p->IsIP = 0;
 531                         p->Port = DefaultMXPort;
 532                         p->IPv6 = i == 1;
 533                         p->Host = Msg->node;
 534
 535                         *pp = p;
 536                         pp = &p->Next;
 537                 }
 538                 Msg->CXFlags   = Msg->CXFlags & F_DIRECT;
 539         }
 540         if (Msg->MyQItem->FallBackHost != NULL)
 541         {
 542                 Msg->MyQItem->FallBackHost->Next = *pp;
 543                 *pp = Msg->MyQItem->FallBackHost;
 544         }
 545         Msg->pCurrRelay = Msg->Relay;
 546         return get_one_mx_host_ip(IO);
 547 }
 548
 549 eNextState resolve_mx_records(AsyncIO *IO)
 550 {
 551         SmtpOutMsg * Msg = IO->Data;
 552
 553         EVS_syslog(LOG_DEBUG, "%s\n", __FUNCTION__);
 554         /* start resolving MX records here. */
 555         if (!QueueQuery(ns_t_mx,
 556                         Msg->node,
 557                         &Msg->IO,
 558                         &Msg->MxLookup,
 559                         smtp_resolve_mx_record_done))
 560         {
 561                 Msg->MyQEntry->Status = 5;
 562                 StrBufPrintf(Msg->MyQEntry->StatusMessage,
 563                              "No MX hosts found for <%s>", Msg->node);
 564                 return IO->NextState;
 565         }
 566         Msg->IO.NextState = eReadDNSReply;
 567         return IO->NextState;
 568 }
 569
 570
 571
 572 /******************************************************************************
 573  *  so, we're going to start a SMTP delivery.  lets get it on.                *
 574  ******************************************************************************/
 575
 576 SmtpOutMsg *new_smtp_outmsg(OneQueItem *MyQItem,
 577                             MailQEntry *MyQEntry,
 578                             int MsgCount)
 579 {
 580         SmtpOutMsg * Msg;
 581
 582         Msg = (SmtpOutMsg *) malloc(sizeof(SmtpOutMsg));
 583         memset(Msg, 0, sizeof(SmtpOutMsg));
 584
 585         Msg->n                = MsgCount;
 586         Msg->MyQEntry         = MyQEntry;
 587         Msg->MyQItem          = MyQItem;
 588         Msg->pCurrRelay       = MyQItem->URL;
 589
 590         InitIOStruct(&Msg->IO,
 591                      Msg,
 592                      eReadMessage,
 593                      SMTP_C_ReadServerStatus,
 594                      SMTP_C_DNSFail,
 595                      SMTP_C_DispatchWriteDone,
 596                      SMTP_C_DispatchReadDone,
 597                      SMTP_C_Terminate,
 598                      SMTP_C_TerminateDB,
 599                      SMTP_C_ConnFail,
 600                      SMTP_C_Timeout,
 601                      SMTP_C_Shutdown);
 602
 603         Msg->IO.ErrMsg = Msg->MyQEntry->StatusMessage;
 604
 605         return Msg;
 606 }
 607
 608 void smtp_try_one_queue_entry(OneQueItem *MyQItem,
 609                               MailQEntry *MyQEntry,
 610                               StrBuf *MsgText,
 611                         /*KeepMsgText allows us to use MsgText as ours.*/
 612                               int KeepMsgText,
 613                               int MsgCount)
 614 {
 615         SmtpOutMsg *Msg;
 616
 617         SMTPC_syslog(LOG_DEBUG, "%s\n", __FUNCTION__);
 618
 619         Msg = new_smtp_outmsg(MyQItem, MyQEntry, MsgCount);
 620         if (KeepMsgText) Msg->msgtext = MsgText;
 621         else             Msg->msgtext = NewStrBufDup(MsgText);
 622
 623         if (smtp_resolve_recipients(Msg)) {
 624
 625                 safestrncpy(
 626                         ((CitContext *)Msg->IO.CitContext)->cs_host,
 627                         Msg->node,
 628                         sizeof(((CitContext *)
 629                                 Msg->IO.CitContext)->cs_host));
 630
 631                 SMTPC_syslog(LOG_DEBUG, "Starting: [%ld] <%s> CC <%d> \n",
 632                              Msg->MyQItem->MessageID,
 633                              ChrPtr(Msg->MyQEntry->Recipient),
 634                              ((CitContext*)Msg->IO.CitContext)->cs_pid);
 635                 if (Msg->pCurrRelay == NULL)
 636                         QueueEventContext(&Msg->IO,
 637                                           resolve_mx_records);
 638                 else { /* oh... via relay host */
 639                         if (Msg->pCurrRelay->IsIP) {
 640                                 QueueEventContext(&Msg->IO,
 641                                                   mx_connect_ip);
 642                         }
 643                         else {
 644                                 /* uneducated admin has chosen to
 645                                    add DNS to the equation... */
 646                                 QueueEventContext(&Msg->IO,
 647                                                   get_one_mx_host_ip);
 648                         }
 649                 }
 650         }
 651         else {
 652                 /* No recipients? well fail then. */
 653                 if ((Msg==NULL) ||
 654                     (Msg->MyQEntry == NULL)) {
 655                         Msg->MyQEntry->Status = 5;
 656                         StrBufPlain(Msg->MyQEntry->StatusMessage,
 657                                     HKEY("Invalid Recipient!"));
 658                 }
 659                 FinalizeMessageSend_1(&Msg->IO);
 660                 FinalizeMessageSend_DB_1(&Msg->IO);
 661                 FinalizeMessageSend_DB_2(&Msg->IO);
 662                 FinalizeMessageSend_DB_3(&Msg->IO);
 663                 FinalizeMessageSend_DB(&Msg->IO);
 664         }
 665 }
 666
 667
 668
 669
 670
 671
 672 /*****************************************************************************/
 673 /*                     SMTP CLIENT DISPATCHER                                */
 674 /*****************************************************************************/
 675
 676 void SMTPSetTimeout(eNextState NextTCPState, SmtpOutMsg *Msg)
 677 {
 678         double Timeout = 0.0;
 679         AsyncIO *IO = &Msg->IO;
 680
 681         EVS_syslog(LOG_DEBUG, "%s\n", __FUNCTION__);
 682
 683         switch (NextTCPState) {
 684         case eSendFile:
 685         case eSendReply:
 686         case eSendMore:
 687                 Timeout = SMTP_C_SendTimeouts[Msg->State];
 688                 if (Msg->State == eDATABody) {
 689                         /* if we're sending a huge message,
 690                          * we need more time.
 691                          */
 692                         Timeout += StrLength(Msg->msgtext) / 512;
 693                 }
 694                 break;
 695         case eReadMessage:
 696                 Timeout = SMTP_C_ReadTimeouts[Msg->State];
 697                 if (Msg->State == eDATATerminateBody) {
 698                         /*
 699                          * some mailservers take a nap before accepting
 700                          * the message content inspection and such.
 701                          */
 702                         Timeout += StrLength(Msg->msgtext) / 512;
 703                 }
 704                 break;
 705         case eSendDNSQuery:
 706         case eReadDNSReply:
 707         case eDBQuery:
 708         case eReadFile:
 709         case eReadMore:
 710         case eReadPayload:
 711         case eConnect:
 712         case eTerminateConnection:
 713         case eAbort:
 714                 return;
 715         }
 716         SetNextTimeout(&Msg->IO, Timeout);
 717 }
 718 eNextState SMTP_C_DispatchReadDone(AsyncIO *IO)
 719 {
 720         EVS_syslog(LOG_DEBUG, "%s\n", __FUNCTION__);
 721         SmtpOutMsg *Msg = IO->Data;
 722         eNextState rc;
 723
 724         rc = ReadHandlers[Msg->State](Msg);
 725         if (rc != eAbort)
 726         {
 727                 Msg->State++;
 728                 SMTPSetTimeout(rc, Msg);
 729         }
 730         return rc;
 731 }
 732 eNextState SMTP_C_DispatchWriteDone(AsyncIO *IO)
 733 {
 734         EVS_syslog(LOG_DEBUG, "%s\n", __FUNCTION__);
 735         SmtpOutMsg *Msg = IO->Data;
 736         eNextState rc;
 737
 738         rc = SendHandlers[Msg->State](Msg);
 739         SMTPSetTimeout(rc, Msg);
 740         return rc;
 741 }
 742
 743
 744 /*****************************************************************************/
 745 /*                     SMTP CLIENT ERROR CATCHERS                            */
 746 /*****************************************************************************/
 747 eNextState SMTP_C_Terminate(AsyncIO *IO)
 748 {
 749         SmtpOutMsg *Msg = IO->Data;
 750
 751         EVS_syslog(LOG_DEBUG, "%s\n", __FUNCTION__);
 752         return FinalizeMessageSend(Msg);
 753 }
 754 eNextState SMTP_C_TerminateDB(AsyncIO *IO)
 755 {
 756         EVS_syslog(LOG_DEBUG, "%s\n", __FUNCTION__);
 757         return FinalizeMessageSend_DB(IO);
 758 }
 759 eNextState SMTP_C_Timeout(AsyncIO *IO)
 760 {
 761         SmtpOutMsg *Msg = IO->Data;
 762
 763         Msg->MyQEntry->Status = 4;
 764         EVS_syslog(LOG_DEBUG, "%s\n", __FUNCTION__);
 765         StrBufPlain(IO->ErrMsg, CKEY(ReadErrors[Msg->State]));
 766         if (Msg->State > eRCPT)
 767                 return eAbort;
 768         else
 769                 return FailOneAttempt(IO);
 770 }
 771 eNextState SMTP_C_ConnFail(AsyncIO *IO)
 772 {
 773         SmtpOutMsg *Msg = IO->Data;
 774
 775         Msg->MyQEntry->Status = 4;
 776         EVS_syslog(LOG_DEBUG, "%s\n", __FUNCTION__);
 777         StrBufPlain(IO->ErrMsg, CKEY(ReadErrors[Msg->State]));
 778         return FailOneAttempt(IO);
 779 }
 780 eNextState SMTP_C_DNSFail(AsyncIO *IO)
 781 {
 782         SmtpOutMsg *Msg = IO->Data;
 783         Msg->MyQEntry->Status = 4;
 784         EVS_syslog(LOG_DEBUG, "%s\n", __FUNCTION__);
 785         return FailOneAttempt(IO);
 786 }
 787 eNextState SMTP_C_Shutdown(AsyncIO *IO)
 788 {
 789         EVS_syslog(LOG_DEBUG, "%s\n", __FUNCTION__);
 790         SmtpOutMsg *Msg = IO->Data;
 791
 792         Msg->MyQEntry->Status = 3;
 793         StrBufPlain(Msg->MyQEntry->StatusMessage,
 794                     HKEY("server shutdown during message submit."));
 795         return FinalizeMessageSend(Msg);
 796 }
 797
 798
 799 /**
 800  * @brief lineread Handler;
 801  * understands when to read more SMTP lines, and when this is a one-lined reply.
 802  */
 803 eReadState SMTP_C_ReadServerStatus(AsyncIO *IO)
 804 {
 805         eReadState Finished = eBufferNotEmpty;
 806
 807         while (Finished == eBufferNotEmpty) {
 808                 Finished = StrBufChunkSipLine(IO->IOBuf, &IO->RecvBuf);
 809
 810                 switch (Finished) {
 811                 case eMustReadMore: /// read new from socket...
 812                         return Finished;
 813                         break;
 814                 case eBufferNotEmpty: /* shouldn't happen... */
 815                 case eReadSuccess: /// done for now...
 816                         if (StrLength(IO->IOBuf) < 4)
 817                                 continue;
 818                         if (ChrPtr(IO->IOBuf)[3] == '-')
 819                                 Finished = eBufferNotEmpty;
 820                         else
 821                                 return Finished;
 822                         break;
 823                 case eReadFail: /// WHUT?
 824                         ///todo: shut down!
 825                         break;
 826                 }
 827         }
 828         return Finished;
 829 }
 830
 831 void LogDebugEnableSMTPClient(const int n)
 832 {
 833         SMTPClientDebugEnabled = n;
 834 }
 835
 836 CTDL_MODULE_INIT(smtp_eventclient)
 837 {
 838         if (!threading)
 839                 CtdlRegisterDebugFlagHook(HKEY("smtpeventclient"), LogDebugEnableSMTPClient, &SMTPClientDebugEnabled);
 840         return "smtpeventclient";
 841 }