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         EV_syslog(LOG_DEBUG, "SMTP: %s Aborting\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 Successfull.";
 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                    "SMTP: %s Time[%fs] Recipient <%s> @ <%s> (%s) Statusmessage: %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, "SMTPQD: %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, "SMTPQ: %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, "SMTP: %s Aborting\n", __FUNCTION__);
 294                 return eAbort;
 295         }
 296         if (Msg->pCurrRelay->IsIP) {
 297                 EVS_syslog(LOG_DEBUG, "SMTP: %s connecting IP\n", __FUNCTION__);
 298                 return mx_connect_ip(IO);
 299         }
 300         else {
 301                 EVS_syslog(LOG_DEBUG,
 302                            "SMTP: %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_DEBUG,
 336                   "SMTP client[%ld]: connecting to %s [%s]:%d ...\n",
 337                   Msg->n,
 338                   Msg->mx_host,
 339                   buf,
 340                   Msg->IO.ConnectMe->Port);
 341
 342         Msg->MyQEntry->Status = 5;
 343         StrBufPrintf(Msg->MyQEntry->StatusMessage,
 344                      "Timeout while connecting %s [%s]:%d ",
 345                      Msg->mx_host,
 346                      buf,
 347                      Msg->IO.ConnectMe->Port);
 348         Msg->IO.NextState = eConnect;
 349 }
 350
 351 /*****************************************************************************
 352  * So we connect our Relay IP here.                                          *
 353  *****************************************************************************/
 354 eNextState mx_connect_ip(AsyncIO *IO)
 355 {
 356         SmtpOutMsg *Msg = IO->Data;
 357
 358         EVS_syslog(LOG_DEBUG, "SMTP: %s\n", __FUNCTION__);
 359
 360         IO->ConnectMe = Msg->pCurrRelay;
 361         Msg->State = eConnectMX;
 362
 363         SetConnectStatus(IO);
 364
 365         return EvConnectSock(IO,
 366                              SMTP_C_ConnTimeout,
 367                              SMTP_C_ReadTimeouts[0],
 368                              1);
 369 }
 370
 371 eNextState get_one_mx_host_ip_done(AsyncIO *IO)
 372 {
 373         SmtpOutMsg *Msg = IO->Data;
 374         struct hostent *hostent;
 375
 376         QueryCbDone(IO);
 377         EVS_syslog(LOG_DEBUG, "SMTP: %s Time[%fs]\n",
 378                    __FUNCTION__,
 379                    IO->Now - IO->DNS.Start);
 380
 381         hostent = Msg->HostLookup.VParsedDNSReply;
 382         if ((Msg->HostLookup.DNSStatus == ARES_SUCCESS) &&
 383             (hostent != NULL) ) {
 384                 memset(&Msg->pCurrRelay->Addr, 0, sizeof(struct in6_addr));
 385                 if (Msg->pCurrRelay->IPv6) {
 386                         memcpy(&Msg->pCurrRelay->Addr.sin6_addr.s6_addr,
 387                                &hostent->h_addr_list[0],
 388                                sizeof(struct in6_addr));
 389
 390                         Msg->pCurrRelay->Addr.sin6_family =
 391                                 hostent->h_addrtype;
 392                         Msg->pCurrRelay->Addr.sin6_port =
 393                                 htons(DefaultMXPort);
 394                 }
 395                 else {
 396                         struct sockaddr_in *addr;
 397                         /*
 398                          * Bypass the ns lookup result like this:
 399                          * IO->Addr.sin_addr.s_addr = inet_addr("127.0.0.1");
 400                          * addr->sin_addr.s_addr =
 401                          *   htonl((uint32_t)&hostent->h_addr_list[0]);
 402                          */
 403
 404                         addr = (struct sockaddr_in*) &Msg->pCurrRelay->Addr;
 405
 406                         memcpy(&addr->sin_addr.s_addr,
 407                                hostent->h_addr_list[0],
 408                                sizeof(uint32_t));
 409
 410                         addr->sin_family = hostent->h_addrtype;
 411                         addr->sin_port   = htons(DefaultMXPort);
 412                 }
 413                 Msg->mx_host = Msg->pCurrRelay->Host;
 414                 if (Msg->HostLookup.VParsedDNSReply != NULL) {
 415                         Msg->HostLookup.DNSReplyFree(Msg->HostLookup.VParsedDNSReply);
 416                         Msg->HostLookup.VParsedDNSReply = NULL;
 417                 }
 418                 return mx_connect_ip(IO);
 419         }
 420         else {
 421                 if (Msg->HostLookup.VParsedDNSReply != NULL) {
 422                         Msg->HostLookup.DNSReplyFree(Msg->HostLookup.VParsedDNSReply);
 423                         Msg->HostLookup.VParsedDNSReply = NULL;
 424                 }
 425                 return FailOneAttempt(IO);
 426         }
 427 }
 428
 429 eNextState get_one_mx_host_ip(AsyncIO *IO)
 430 {
 431         SmtpOutMsg * Msg = IO->Data;
 432         /*
 433          * here we start with the lookup of one host. it might be...
 434          * - the relay host *sigh*
 435          * - the direct hostname if there was no mx record
 436          * - one of the mx'es
 437          */
 438
 439         EVS_syslog(LOG_DEBUG, "SMTP: %s\n", __FUNCTION__);
 440
 441         EVS_syslog(LOG_DEBUG,
 442                   "SMTP client[%ld]: looking up %s-Record %s : %d ...\n",
 443                   Msg->n,
 444                   (Msg->pCurrRelay->IPv6)? "aaaa": "a",
 445                   Msg->pCurrRelay->Host,
 446                   Msg->pCurrRelay->Port);
 447
 448         if (!QueueQuery((Msg->pCurrRelay->IPv6)? ns_t_aaaa : ns_t_a,
 449                         Msg->pCurrRelay->Host,
 450                         &Msg->IO,
 451                         &Msg->HostLookup,
 452                         get_one_mx_host_ip_done))
 453         {
 454                 Msg->MyQEntry->Status = 5;
 455                 StrBufPrintf(Msg->MyQEntry->StatusMessage,
 456                              "No MX hosts found for <%s>", Msg->node);
 457                 Msg->IO.NextState = eTerminateConnection;
 458                 return IO->NextState;
 459         }
 460         IO->NextState = eReadDNSReply;
 461         return IO->NextState;
 462 }
 463
 464
 465 /*****************************************************************************
 466  * here we try to find out about the MX records for our recipients.          *
 467  *****************************************************************************/
 468 eNextState smtp_resolve_mx_record_done(AsyncIO *IO)
 469 {
 470         SmtpOutMsg * Msg = IO->Data;
 471         ParsedURL **pp;
 472
 473         QueryCbDone(IO);
 474
 475         EVS_syslog(LOG_DEBUG, "SMTP: %s Time[%fs]\n",
 476                    __FUNCTION__,
 477                 IO->Now - IO->DNS.Start);
 478
 479         pp = &Msg->Relay;
 480         while ((pp != NULL) && (*pp != NULL) && ((*pp)->Next != NULL))
 481                 pp = &(*pp)->Next;
 482
 483         if ((IO->DNS.Query->DNSStatus == ARES_SUCCESS) &&
 484             (IO->DNS.Query->VParsedDNSReply != NULL))
 485         { /* ok, we found mx records. */
 486
 487                 Msg->CurrMX
 488                         = Msg->AllMX
 489                         = IO->DNS.Query->VParsedDNSReply;
 490                 while (Msg->CurrMX) {
 491                         int i;
 492                         for (i = 0; i < 2; i++) {
 493                                 ParsedURL *p;
 494
 495                                 p = (ParsedURL*) malloc(sizeof(ParsedURL));
 496                                 memset(p, 0, sizeof(ParsedURL));
 497                                 p->Priority = Msg->CurrMX->priority;
 498                                 p->IsIP = 0;
 499                                 p->Port = DefaultMXPort;
 500                                 p->IPv6 = i == 1;
 501                                 p->Host = Msg->CurrMX->host;
 502                                 if (*pp == NULL)
 503                                         *pp = p;
 504                                 else {
 505                                         ParsedURL *ppp = *pp;
 506
 507                                         while ((ppp->Next != NULL) &&
 508                                                (ppp->Next->Priority <= p->Priority))
 509                                                ppp = ppp->Next;
 510                                         if ((ppp == *pp) &&
 511                                             (ppp->Priority > p->Priority)) {
 512                                                 p->Next = *pp;
 513                                                 *pp = p;
 514                                         }
 515                                         else {
 516                                                 p->Next = ppp->Next;
 517                                                 ppp->Next = p;
 518                                         }
 519                                 }
 520                         }
 521                         Msg->CurrMX    = Msg->CurrMX->next;
 522                 }
 523                 Msg->CXFlags   = Msg->CXFlags & F_HAVE_MX;
 524         }
 525         else { /* else fall back to the plain hostname */
 526                 int i;
 527                 for (i = 0; i < 2; i++) {
 528                         ParsedURL *p;
 529
 530                         p = (ParsedURL*) malloc(sizeof(ParsedURL));
 531                         memset(p, 0, sizeof(ParsedURL));
 532                         p->IsIP = 0;
 533                         p->Port = DefaultMXPort;
 534                         p->IPv6 = i == 1;
 535                         p->Host = Msg->node;
 536
 537                         *pp = p;
 538                         pp = &p->Next;
 539                 }
 540                 Msg->CXFlags   = Msg->CXFlags & F_DIRECT;
 541         }
 542         if (Msg->MyQItem->FallBackHost != NULL)
 543         {
 544                 Msg->MyQItem->FallBackHost->Next = *pp;
 545                 *pp = Msg->MyQItem->FallBackHost;
 546         }
 547         Msg->pCurrRelay = Msg->Relay;
 548         return get_one_mx_host_ip(IO);
 549 }
 550
 551 eNextState resolve_mx_records(AsyncIO *IO)
 552 {
 553         SmtpOutMsg * Msg = IO->Data;
 554
 555         EVS_syslog(LOG_DEBUG, "SMTP: %s\n", __FUNCTION__);
 556         /* start resolving MX records here. */
 557         if (!QueueQuery(ns_t_mx,
 558                         Msg->node,
 559                         &Msg->IO,
 560                         &Msg->MxLookup,
 561                         smtp_resolve_mx_record_done))
 562         {
 563                 Msg->MyQEntry->Status = 5;
 564                 StrBufPrintf(Msg->MyQEntry->StatusMessage,
 565                              "No MX hosts found for <%s>", Msg->node);
 566                 return IO->NextState;
 567         }
 568         Msg->IO.NextState = eReadDNSReply;
 569         return IO->NextState;
 570 }
 571
 572
 573
 574 /******************************************************************************
 575  *  so, we're going to start a SMTP delivery.  lets get it on.                *
 576  ******************************************************************************/
 577
 578 SmtpOutMsg *new_smtp_outmsg(OneQueItem *MyQItem,
 579                             MailQEntry *MyQEntry,
 580                             int MsgCount)
 581 {
 582         SmtpOutMsg * Msg;
 583
 584         Msg = (SmtpOutMsg *) malloc(sizeof(SmtpOutMsg));
 585         memset(Msg, 0, sizeof(SmtpOutMsg));
 586
 587         Msg->n                = MsgCount;
 588         Msg->MyQEntry         = MyQEntry;
 589         Msg->MyQItem          = MyQItem;
 590         Msg->pCurrRelay       = MyQItem->URL;
 591
 592         InitIOStruct(&Msg->IO,
 593                      Msg,
 594                      eReadMessage,
 595                      SMTP_C_ReadServerStatus,
 596                      SMTP_C_DNSFail,
 597                      SMTP_C_DispatchWriteDone,
 598                      SMTP_C_DispatchReadDone,
 599                      SMTP_C_Terminate,
 600                      SMTP_C_TerminateDB,
 601                      SMTP_C_ConnFail,
 602                      SMTP_C_Timeout,
 603                      SMTP_C_Shutdown);
 604
 605         Msg->IO.ErrMsg = Msg->MyQEntry->StatusMessage;
 606
 607         return Msg;
 608 }
 609
 610 void smtp_try_one_queue_entry(OneQueItem *MyQItem,
 611                               MailQEntry *MyQEntry,
 612                               StrBuf *MsgText,
 613                         /*KeepMsgText allows us to use MsgText as ours.*/
 614                               int KeepMsgText,
 615                               int MsgCount)
 616 {
 617         SmtpOutMsg *Msg;
 618
 619         syslog(LOG_DEBUG, "SMTP: %s\n", __FUNCTION__);
 620
 621         Msg = new_smtp_outmsg(MyQItem, MyQEntry, MsgCount);
 622         if (KeepMsgText) Msg->msgtext = MsgText;
 623         else             Msg->msgtext = NewStrBufDup(MsgText);
 624
 625         if (smtp_resolve_recipients(Msg)) {
 626
 627                 safestrncpy(
 628                         ((CitContext *)Msg->IO.CitContext)->cs_host,
 629                         Msg->node,
 630                         sizeof(((CitContext *)
 631                                 Msg->IO.CitContext)->cs_host));
 632
 633                 syslog(LOG_DEBUG, "SMTP Starting: [%ld] <%s> CC <%d> \n",
 634                        Msg->MyQItem->MessageID,
 635                        ChrPtr(Msg->MyQEntry->Recipient),
 636                        ((CitContext*)Msg->IO.CitContext)->cs_pid);
 637                 if (Msg->pCurrRelay == NULL)
 638                         QueueEventContext(&Msg->IO,
 639                                           resolve_mx_records);
 640                 else { /* oh... via relay host */
 641                         if (Msg->pCurrRelay->IsIP) {
 642                                 QueueEventContext(&Msg->IO,
 643                                                   mx_connect_ip);
 644                         }
 645                         else {
 646                                 /* uneducated admin has chosen to
 647                                    add DNS to the equation... */
 648                                 QueueEventContext(&Msg->IO,
 649                                                   get_one_mx_host_ip);
 650                         }
 651                 }
 652         }
 653         else {
 654                 /* No recipients? well fail then. */
 655                 if ((Msg==NULL) ||
 656                     (Msg->MyQEntry == NULL)) {
 657                         Msg->MyQEntry->Status = 5;
 658                         StrBufPlain(Msg->MyQEntry->StatusMessage,
 659                                     HKEY("Invalid Recipient!"));
 660                 }
 661                 FinalizeMessageSend_1(&Msg->IO);
 662                 FinalizeMessageSend_DB_1(&Msg->IO);
 663                 FinalizeMessageSend_DB_2(&Msg->IO);
 664                 FinalizeMessageSend_DB_3(&Msg->IO);
 665                 FinalizeMessageSend_DB(&Msg->IO);
 666         }
 667 }
 668
 669
 670
 671
 672
 673
 674 /*****************************************************************************/
 675 /*                     SMTP CLIENT DISPATCHER                                */
 676 /*****************************************************************************/
 677
 678 void SMTPSetTimeout(eNextState NextTCPState, SmtpOutMsg *Msg)
 679 {
 680         double Timeout = 0.0;
 681         AsyncIO *IO = &Msg->IO;
 682
 683         EVS_syslog(LOG_DEBUG, "SMTP: %s\n", __FUNCTION__);
 684
 685         switch (NextTCPState) {
 686         case eSendFile:
 687         case eSendReply:
 688         case eSendMore:
 689                 Timeout = SMTP_C_SendTimeouts[Msg->State];
 690                 if (Msg->State == eDATABody) {
 691                         /* if we're sending a huge message,
 692                          * we need more time.
 693                          */
 694                         Timeout += StrLength(Msg->msgtext) / 512;
 695                 }
 696                 break;
 697         case eReadMessage:
 698                 Timeout = SMTP_C_ReadTimeouts[Msg->State];
 699                 if (Msg->State == eDATATerminateBody) {
 700                         /*
 701                          * some mailservers take a nap before accepting
 702                          * the message content inspection and such.
 703                          */
 704                         Timeout += StrLength(Msg->msgtext) / 512;
 705                 }
 706                 break;
 707         case eSendDNSQuery:
 708         case eReadDNSReply:
 709         case eDBQuery:
 710         case eReadFile:
 711         case eReadMore:
 712         case eReadPayload:
 713         case eConnect:
 714         case eTerminateConnection:
 715         case eAbort:
 716                 return;
 717         }
 718         SetNextTimeout(&Msg->IO, Timeout);
 719 }
 720 eNextState SMTP_C_DispatchReadDone(AsyncIO *IO)
 721 {
 722         EVS_syslog(LOG_DEBUG, "SMTP: %s\n", __FUNCTION__);
 723         SmtpOutMsg *Msg = IO->Data;
 724         eNextState rc;
 725
 726         rc = ReadHandlers[Msg->State](Msg);
 727         if (rc != eAbort)
 728         {
 729                 Msg->State++;
 730                 SMTPSetTimeout(rc, Msg);
 731         }
 732         return rc;
 733 }
 734 eNextState SMTP_C_DispatchWriteDone(AsyncIO *IO)
 735 {
 736         EVS_syslog(LOG_DEBUG, "SMTP: %s\n", __FUNCTION__);
 737         SmtpOutMsg *Msg = IO->Data;
 738         eNextState rc;
 739
 740         rc = SendHandlers[Msg->State](Msg);
 741         SMTPSetTimeout(rc, Msg);
 742         return rc;
 743 }
 744
 745
 746 /*****************************************************************************/
 747 /*                     SMTP CLIENT ERROR CATCHERS                            */
 748 /*****************************************************************************/
 749 eNextState SMTP_C_Terminate(AsyncIO *IO)
 750 {
 751         SmtpOutMsg *Msg = IO->Data;
 752
 753         EVS_syslog(LOG_DEBUG, "SMTP: %s\n", __FUNCTION__);
 754         return FinalizeMessageSend(Msg);
 755 }
 756 eNextState SMTP_C_TerminateDB(AsyncIO *IO)
 757 {
 758         EVS_syslog(LOG_DEBUG, "SMTP: %s\n", __FUNCTION__);
 759         return FinalizeMessageSend_DB(IO);
 760 }
 761 eNextState SMTP_C_Timeout(AsyncIO *IO)
 762 {
 763         SmtpOutMsg *Msg = IO->Data;
 764
 765         Msg->MyQEntry->Status = 4;
 766         EVS_syslog(LOG_DEBUG, "SMTP: %s\n", __FUNCTION__);
 767         StrBufPlain(IO->ErrMsg, CKEY(ReadErrors[Msg->State]));
 768         if (Msg->State > eRCPT)
 769                 return eAbort;
 770         else
 771                 return FailOneAttempt(IO);
 772 }
 773 eNextState SMTP_C_ConnFail(AsyncIO *IO)
 774 {
 775         SmtpOutMsg *Msg = IO->Data;
 776
 777         Msg->MyQEntry->Status = 4;
 778         EVS_syslog(LOG_DEBUG, "SMTP: %s\n", __FUNCTION__);
 779         StrBufPlain(IO->ErrMsg, CKEY(ReadErrors[Msg->State]));
 780         return FailOneAttempt(IO);
 781 }
 782 eNextState SMTP_C_DNSFail(AsyncIO *IO)
 783 {
 784         SmtpOutMsg *Msg = IO->Data;
 785         Msg->MyQEntry->Status = 4;
 786         EVS_syslog(LOG_DEBUG, "SMTP: %s\n", __FUNCTION__);
 787         return FailOneAttempt(IO);
 788 }
 789 eNextState SMTP_C_Shutdown(AsyncIO *IO)
 790 {
 791         EVS_syslog(LOG_DEBUG, "SMTP: %s\n", __FUNCTION__);
 792         SmtpOutMsg *Msg = IO->Data;
 793
 794         Msg->MyQEntry->Status = 3;
 795         StrBufPlain(Msg->MyQEntry->StatusMessage,
 796                     HKEY("server shutdown during message submit."));
 797         return FinalizeMessageSend(Msg);
 798 }
 799
 800
 801 /**
 802  * @brief lineread Handler;
 803  * understands when to read more SMTP lines, and when this is a one-lined reply.
 804  */
 805 eReadState SMTP_C_ReadServerStatus(AsyncIO *IO)
 806 {
 807         eReadState Finished = eBufferNotEmpty;
 808
 809         while (Finished == eBufferNotEmpty) {
 810                 Finished = StrBufChunkSipLine(IO->IOBuf, &IO->RecvBuf);
 811
 812                 switch (Finished) {
 813                 case eMustReadMore: /// read new from socket...
 814                         return Finished;
 815                         break;
 816                 case eBufferNotEmpty: /* shouldn't happen... */
 817                 case eReadSuccess: /// done for now...
 818                         if (StrLength(IO->IOBuf) < 4)
 819                                 continue;
 820                         if (ChrPtr(IO->IOBuf)[3] == '-')
 821                                 Finished = eBufferNotEmpty;
 822                         else
 823                                 return Finished;
 824                         break;
 825                 case eReadFail: /// WHUT?
 826                         ///todo: shut down!
 827                         break;
 828                 }
 829         }
 830         return Finished;
 831 }
 832
 833 void LogDebugEnableSMTPClient(void)
 834 {
 835         SMTPClientDebugEnabled = 1;
 836 }
 837
 838 CTDL_MODULE_INIT(smtp_eventclient)
 839 {
 840         if (!threading)
 841                 CtdlRegisterDebugFlagHook(HKEY("smtpeventclient"), LogDebugEnableSMTPClient);
 842         return "smtpeventclient";
 843 }