citadel/modules/smtp/serv_smtpeventclient.c

   1 /*
   2  * This module is an SMTP and ESMTP implementation for the Citadel system.
   3  * It is compliant with all of the following:
   4  *
   5  * RFC  821 - Simple Mail Transfer Protocol
   6  * RFC  876 - Survey of SMTP Implementations
   7  * RFC 1047 - Duplicate messages and SMTP
   8  * RFC 1652 - 8 bit MIME
   9  * RFC 1869 - Extended Simple Mail Transfer Protocol
  10  * RFC 1870 - SMTP Service Extension for Message Size Declaration
  11  * RFC 2033 - Local Mail Transfer Protocol
  12  * RFC 2197 - SMTP Service Extension for Command Pipelining
  13  * RFC 2476 - Message Submission
  14  * RFC 2487 - SMTP Service Extension for Secure SMTP over TLS
  15  * RFC 2554 - SMTP Service Extension for Authentication
  16  * RFC 2821 - Simple Mail Transfer Protocol
  17  * RFC 2822 - Internet Message Format
  18  * RFC 2920 - SMTP Service Extension for Command Pipelining
  19  *
  20  * The VRFY and EXPN commands have been removed from this implementation
  21  * because nobody uses these commands anymore, except for spammers.
  22  *
  23  * Copyright (c) 1998-2012 by the citadel.org team
  24  *
  25  *  This program is open source software; you can redistribute it and/or modify
  26  *  it under the terms of the GNU General Public License version 3.
  27  *
  28  *
  29  *
  30  *  This program is distributed in the hope that it will be useful,
  31  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  32  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  33  *  GNU General Public License for more details.
  34  *
  35  *
  36  *
  37  *
  38  */
  39
  40 #include "sysdep.h"
  41 #include <stdlib.h>
  42 #include <unistd.h>
  43 #include <stdio.h>
  44 #include <termios.h>
  45 #include <fcntl.h>
  46 #include <signal.h>
  47 #include <pwd.h>
  48 #include <errno.h>
  49 #include <sys/types.h>
  50 #include <syslog.h>
  51
  52 #if TIME_WITH_SYS_TIME
  53 # include <sys/time.h>
  54 # include <time.h>
  55 #else
  56 # if HAVE_SYS_TIME_H
  57 #  include <sys/time.h>
  58 # else
  59 #  include <time.h>
  60 # endif
  61 #endif
  62 #include <sys/wait.h>
  63 #include <ctype.h>
  64 #include <string.h>
  65 #include <limits.h>
  66 #include <sys/socket.h>
  67 #include <netinet/in.h>
  68 #include <arpa/inet.h>
  69 #include <libcitadel.h>
  70 #include "citadel.h"
  71 #include "server.h"
  72 #include "citserver.h"
  73 #include "support.h"
  74 #include "config.h"
  75 #include "control.h"
  76 #include "user_ops.h"
  77 #include "database.h"
  78 #include "msgbase.h"
  79 #include "internet_addressing.h"
  80 #include "genstamp.h"
  81 #include "domain.h"
  82 #include "clientsocket.h"
  83 #include "locate_host.h"
  84 #include "citadel_dirs.h"
  85
  86 #include "ctdl_module.h"
  87
  88 #include "smtp_util.h"
  89 #include "event_client.h"
  90 #include "smtpqueue.h"
  91 #include "smtp_clienthandlers.h"
  92
  93 const unsigned short DefaultMXPort = 25;
  94 void DeleteSmtpOutMsg(void *v)
  95 {
  96         SmtpOutMsg *Msg = v;
  97         AsyncIO *IO = &Msg->IO;
  98         EV_syslog(LOG_DEBUG, "SMTP: %s Aborting\n", __FUNCTION__);
  99
 100         /* these are kept in our own space and free'd below */
 101         Msg->IO.ConnectMe = NULL;
 102
 103         ares_free_data(Msg->AllMX);
 104         if (Msg->HostLookup.VParsedDNSReply != NULL)
 105                 Msg->HostLookup.DNSReplyFree(Msg->HostLookup.VParsedDNSReply);
 106         FreeURL(&Msg->Relay);
 107         FreeStrBuf(&Msg->msgtext);
 108         FreeAsyncIOContents(&Msg->IO);
 109         memset (Msg, 0, sizeof(SmtpOutMsg)); /* just to be shure... */
 110         free(Msg);
 111 }
 112
 113 eNextState SMTP_C_Shutdown(AsyncIO *IO);
 114 eNextState SMTP_C_Timeout(AsyncIO *IO);
 115 eNextState SMTP_C_ConnFail(AsyncIO *IO);
 116 eNextState SMTP_C_DispatchReadDone(AsyncIO *IO);
 117 eNextState SMTP_C_DispatchWriteDone(AsyncIO *IO);
 118 eNextState SMTP_C_DNSFail(AsyncIO *IO);
 119 eNextState SMTP_C_Terminate(AsyncIO *IO);
 120 eNextState SMTP_C_TerminateDB(AsyncIO *IO);
 121 eReadState SMTP_C_ReadServerStatus(AsyncIO *IO);
 122
 123 eNextState mx_connect_ip(AsyncIO *IO);
 124 eNextState get_one_mx_host_ip(AsyncIO *IO);
 125 eNextState FinalizeMessageSendDB(AsyncIO *IO);
 126 eNextState FinalizeMessageSend_DB1(AsyncIO *IO);
 127 eNextState FinalizeMessageSend_DB2(AsyncIO *IO);
 128 eNextState FinalizeMessageSend_DB3(AsyncIO *IO);
 129 eNextState FinalizeMessageSend_DB4(AsyncIO *IO);
 130
 131 /******************************************************************************
 132  * So, we're finished with sending (regardless of success or failure)         *
 133  * This Message might be referenced by several Queue-Items, if we're the last,*
 134  * we need to free the memory and send bounce messages (on terminal failure)  *
 135  * else we just free our SMTP-Message struct.                                 *
 136  ******************************************************************************/
 137 inline void FinalizeMessageSend_1(AsyncIO *IO)
 138 {
 139         const char *Status;
 140         SmtpOutMsg *Msg = IO->Data;
 141
 142         if (Msg->MyQEntry->Status == 2)
 143                 Status = "Delivery Successfull.";
 144         else if (Msg->MyQEntry->Status == 5)
 145                 Status = "Delivery failed permanently; giving up.";
 146         else
 147                 Status = "Delivery failed temporarily; will retry later.";
 148
 149         EVS_syslog(LOG_INFO,
 150                    "SMTP: %s Time[%fs] Recipient <%s> @ <%s> (%s) Statusmessage: %s\n",
 151                    Status,
 152                    Msg->IO.Now - Msg->IO.StartIO,
 153                    Msg->user,
 154                    Msg->node,
 155                    Msg->name,
 156                    ChrPtr(Msg->MyQEntry->StatusMessage));
 157
 158
 159         Msg->IDestructQueItem = DecreaseQReference(Msg->MyQItem);
 160
 161         Msg->nRemain = CountActiveQueueEntries(Msg->MyQItem);
 162
 163         if (Msg->MyQEntry->Active &&
 164             CheckQEntryIsBounce(Msg->MyQEntry))
 165         {
 166                 /* are we casue for a bounce mail? */
 167                 Msg->MyQItem->SendBounceMail |= (1<<Msg->MyQEntry->Status);
 168         }
 169
 170         if ((Msg->nRemain > 0) || Msg->IDestructQueItem)
 171                 Msg->QMsgData = SerializeQueueItem(Msg->MyQItem);
 172         else
 173                 Msg->QMsgData = NULL;
 174 }
 175 eNextState FinalizeMessageSend(SmtpOutMsg *Msg)
 176 {
 177         return QueueDBOperation(&Msg->IO, FinalizeMessageSend_DB1);
 178 }
 179
 180 inline void FinalizeMessageSend_DB_1(AsyncIO *IO)
 181 {
 182         SmtpOutMsg *Msg = IO->Data;
 183
 184         /*
 185          * Uncompleted delivery instructions remain, so delete the old
 186          * instructions and replace with the updated ones.
 187          */
 188         EVS_syslog(LOG_DEBUG, "SMTPQD: %ld", Msg->MyQItem->QueMsgID);
 189         CtdlDeleteMessages(SMTP_SPOOLOUT_ROOM, &Msg->MyQItem->QueMsgID, 1, "");
 190 }
 191 eNextState FinalizeMessageSend_DB1(AsyncIO *IO)
 192 {
 193         FinalizeMessageSend_1(IO);
 194         FinalizeMessageSend_DB_1(IO);
 195         return NextDBOperation(IO, FinalizeMessageSend_DB2);
 196 }
 197
 198
 199 inline void FinalizeMessageSend_DB_2(AsyncIO *IO)
 200 {
 201         SmtpOutMsg *Msg = IO->Data;
 202
 203         if (Msg->IDestructQueItem)
 204                 smtpq_do_bounce(Msg->MyQItem, Msg->msgtext);
 205 }
 206 eNextState FinalizeMessageSend_DB2(AsyncIO *IO)
 207 {
 208         FinalizeMessageSend_DB_2(IO);
 209
 210         return NextDBOperation(IO, FinalizeMessageSend_DB3);
 211 }
 212
 213
 214 inline void FinalizeMessageSend_DB_3(AsyncIO *IO)
 215 {
 216         SmtpOutMsg *Msg = IO->Data;
 217
 218         if (Msg->nRemain > 0)
 219         {
 220                 struct CtdlMessage *msg;
 221                 msg = malloc(sizeof(struct CtdlMessage));
 222                 memset(msg, 0, sizeof(struct CtdlMessage));
 223                 msg->cm_magic = CTDLMESSAGE_MAGIC;
 224                 msg->cm_anon_type = MES_NORMAL;
 225                 msg->cm_format_type = FMT_RFC822;
 226                 msg->cm_fields['M'] = SmashStrBuf(&Msg->QMsgData);
 227                 msg->cm_fields['U'] = strdup("QMSG");
 228                 Msg->MyQItem->QueMsgID =
 229                         CtdlSubmitMsg(msg, NULL, SMTP_SPOOLOUT_ROOM, QP_EADDR);
 230                 EVS_syslog(LOG_DEBUG, "SMTPQ: %ld", Msg->MyQItem->QueMsgID);
 231                 CtdlFreeMessage(msg);
 232         }
 233         else {
 234                 CtdlDeleteMessages(SMTP_SPOOLOUT_ROOM,
 235                                    &Msg->MyQItem->MessageID,
 236                                    1,
 237                                    "");
 238                 FreeStrBuf(&Msg->QMsgData);
 239         }
 240         DecreaseShutdownDeliveries(Msg->MyQItem);
 241 }
 242 eNextState FinalizeMessageSend_DB3(AsyncIO *IO)
 243 {
 244         SmtpOutMsg *Msg = IO->Data;
 245         FinalizeMessageSend_DB_3(IO);
 246         if (!Msg->IDestructQueItem)
 247                 return eAbort;
 248         return NextDBOperation(IO, FinalizeMessageSend_DB4);
 249 }
 250
 251 eNextState FinalizeMessageSend_DB4(AsyncIO *IO)
 252 {
 253         int Done;
 254         SmtpOutMsg *Msg = IO->Data;
 255
 256         Done = GetShutdownDeliveries(Msg->MyQItem);
 257         if (!Done)
 258                 return NextDBOperation(IO, FinalizeMessageSend_DB4);
 259         else
 260                 return eAbort;
 261 }
 262
 263 eNextState FinalizeMessageSend_DB(AsyncIO *IO)
 264 {
 265         SmtpOutMsg *Msg = IO->Data;
 266
 267         RemoveContext(Msg->IO.CitContext);
 268         if (Msg->IDestructQueItem)
 269                 RemoveQItem(Msg->MyQItem);
 270         DeleteSmtpOutMsg(Msg);
 271         return eAbort;
 272 }
 273
 274 eNextState FailOneAttempt(AsyncIO *IO)
 275 {
 276         SmtpOutMsg *Msg = IO->Data;
 277
 278         if (Msg->MyQEntry->Status == 2)
 279                 return eAbort;
 280
 281         /*
 282          * possible ways here:
 283          * - connection timeout
 284          * - dns lookup failed
 285          */
 286         StopClientWatchers(IO);
 287
 288         if (Msg->pCurrRelay != NULL)
 289                 Msg->pCurrRelay = Msg->pCurrRelay->Next;
 290
 291         if (Msg->pCurrRelay == NULL) {
 292                 EVS_syslog(LOG_DEBUG, "SMTP: %s Aborting\n", __FUNCTION__);
 293                 return eAbort;
 294         }
 295         if (Msg->pCurrRelay->IsIP) {
 296                 EVS_syslog(LOG_DEBUG, "SMTP: %s connecting IP\n", __FUNCTION__);
 297                 return mx_connect_ip(IO);
 298         }
 299         else {
 300                 EVS_syslog(LOG_DEBUG,
 301                            "SMTP: %s resolving next MX Record\n",
 302                            __FUNCTION__);
 303                 return get_one_mx_host_ip(IO);
 304         }
 305 }
 306
 307
 308 void SetConnectStatus(AsyncIO *IO)
 309 {
 310         SmtpOutMsg *Msg = IO->Data;
 311         char buf[256];
 312         void *src;
 313
 314         buf[0] = '\0';
 315
 316         if (IO->ConnectMe->IPv6) {
 317                 src = &IO->ConnectMe->Addr.sin6_addr;
 318         }
 319         else {
 320                 struct sockaddr_in *addr;
 321
 322                 addr = (struct sockaddr_in *)&IO->ConnectMe->Addr;
 323                 src = &addr->sin_addr.s_addr;
 324         }
 325
 326         inet_ntop((IO->ConnectMe->IPv6)?AF_INET6:AF_INET,
 327                   src,
 328                   buf,
 329                   sizeof(buf));
 330
 331         if (Msg->mx_host == NULL)
 332                 Msg->mx_host = "<no MX-Record>";
 333
 334         EVS_syslog(LOG_DEBUG,
 335                   "SMTP client[%ld]: connecting to %s [%s]:%d ...\n",
 336                   Msg->n,
 337                   Msg->mx_host,
 338                   buf,
 339                   Msg->IO.ConnectMe->Port);
 340
 341         Msg->MyQEntry->Status = 5;
 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, "SMTP: %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, "SMTP: %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, "SMTP: %s\n", __FUNCTION__);
 439
 440         EVS_syslog(LOG_DEBUG,
 441                   "SMTP client[%ld]: looking up %s-Record %s : %d ...\n",
 442                   Msg->n,
 443                   (Msg->pCurrRelay->IPv6)? "aaaa": "a",
 444                   Msg->pCurrRelay->Host,
 445                   Msg->pCurrRelay->Port);
 446
 447         if (!QueueQuery((Msg->pCurrRelay->IPv6)? ns_t_aaaa : ns_t_a,
 448                         Msg->pCurrRelay->Host,
 449                         &Msg->IO,
 450                         &Msg->HostLookup,
 451                         get_one_mx_host_ip_done))
 452         {
 453                 Msg->MyQEntry->Status = 5;
 454                 StrBufPrintf(Msg->MyQEntry->StatusMessage,
 455                              "No MX hosts found for <%s>", Msg->node);
 456                 Msg->IO.NextState = eTerminateConnection;
 457                 return IO->NextState;
 458         }
 459         IO->NextState = eReadDNSReply;
 460         return IO->NextState;
 461 }
 462
 463
 464 /*****************************************************************************
 465  * here we try to find out about the MX records for our recipients.          *
 466  *****************************************************************************/
 467 eNextState smtp_resolve_mx_record_done(AsyncIO *IO)
 468 {
 469         SmtpOutMsg * Msg = IO->Data;
 470         ParsedURL **pp;
 471
 472         QueryCbDone(IO);
 473
 474         EVS_syslog(LOG_DEBUG, "SMTP: %s Time[%fs]\n",
 475                    __FUNCTION__,
 476                 IO->Now - IO->DNS.Start);
 477
 478         pp = &Msg->Relay;
 479         while ((pp != NULL) && (*pp != NULL) && ((*pp)->Next != NULL))
 480                 pp = &(*pp)->Next;
 481
 482         if ((IO->DNS.Query->DNSStatus == ARES_SUCCESS) &&
 483             (IO->DNS.Query->VParsedDNSReply != NULL))
 484         { /* ok, we found mx records. */
 485
 486                 Msg->CurrMX
 487                         = Msg->AllMX
 488                         = IO->DNS.Query->VParsedDNSReply;
 489                 while (Msg->CurrMX) {
 490                         int i;
 491                         for (i = 0; i < 2; i++) {
 492                                 ParsedURL *p;
 493
 494                                 p = (ParsedURL*) malloc(sizeof(ParsedURL));
 495                                 memset(p, 0, sizeof(ParsedURL));
 496                                 p->Priority = Msg->CurrMX->priority;
 497                                 p->IsIP = 0;
 498                                 p->Port = DefaultMXPort;
 499                                 p->IPv6 = i == 1;
 500                                 p->Host = Msg->CurrMX->host;
 501                                 if (*pp == NULL)
 502                                         *pp = p;
 503                                 else {
 504                                         ParsedURL *ppp = *pp;
 505
 506                                         while ((ppp->Next != NULL) &&
 507                                                (ppp->Next->Priority <= p->Priority))
 508                                                ppp = ppp->Next;
 509                                         if ((ppp == *pp) &&
 510                                             (ppp->Priority > p->Priority)) {
 511                                                 p->Next = *pp;
 512                                                 *pp = p;
 513                                         }
 514                                         else {
 515                                                 p->Next = ppp->Next;
 516                                                 ppp->Next = p;
 517                                         }
 518                                 }
 519                         }
 520                         Msg->CurrMX    = Msg->CurrMX->next;
 521                 }
 522                 Msg->CXFlags   = Msg->CXFlags & F_HAVE_MX;
 523         }
 524         else { /* else fall back to the plain hostname */
 525                 int i;
 526                 for (i = 0; i < 2; i++) {
 527                         ParsedURL *p;
 528
 529                         p = (ParsedURL*) malloc(sizeof(ParsedURL));
 530                         memset(p, 0, sizeof(ParsedURL));
 531                         p->IsIP = 0;
 532                         p->Port = DefaultMXPort;
 533                         p->IPv6 = i == 1;
 534                         p->Host = Msg->node;
 535
 536                         *pp = p;
 537                         pp = &p->Next;
 538                 }
 539                 Msg->CXFlags   = Msg->CXFlags & F_DIRECT;
 540         }
 541         if (Msg->MyQItem->FallBackHost != NULL)
 542         {
 543                 Msg->MyQItem->FallBackHost->Next = *pp;
 544                 *pp = Msg->MyQItem->FallBackHost;
 545         }
 546         Msg->pCurrRelay = Msg->Relay;
 547         return get_one_mx_host_ip(IO);
 548 }
 549
 550 eNextState resolve_mx_records(AsyncIO *IO)
 551 {
 552         SmtpOutMsg * Msg = IO->Data;
 553
 554         EVS_syslog(LOG_DEBUG, "SMTP: %s\n", __FUNCTION__);
 555         /* start resolving MX records here. */
 556         if (!QueueQuery(ns_t_mx,
 557                         Msg->node,
 558                         &Msg->IO,
 559                         &Msg->MxLookup,
 560                         smtp_resolve_mx_record_done))
 561         {
 562                 Msg->MyQEntry->Status = 5;
 563                 StrBufPrintf(Msg->MyQEntry->StatusMessage,
 564                              "No MX hosts found for <%s>", Msg->node);
 565                 return IO->NextState;
 566         }
 567         Msg->IO.NextState = eReadDNSReply;
 568         return IO->NextState;
 569 }
 570
 571
 572
 573 /******************************************************************************
 574  *  so, we're going to start a SMTP delivery.  lets get it on.                *
 575  ******************************************************************************/
 576
 577 SmtpOutMsg *new_smtp_outmsg(OneQueItem *MyQItem,
 578                             MailQEntry *MyQEntry,
 579                             int MsgCount)
 580 {
 581         SmtpOutMsg * Msg;
 582
 583         Msg = (SmtpOutMsg *) malloc(sizeof(SmtpOutMsg));
 584         memset(Msg, 0, sizeof(SmtpOutMsg));
 585
 586         Msg->n                = MsgCount;
 587         Msg->MyQEntry         = MyQEntry;
 588         Msg->MyQItem          = MyQItem;
 589         Msg->pCurrRelay       = MyQItem->URL;
 590
 591         InitIOStruct(&Msg->IO,
 592                      Msg,
 593                      eReadMessage,
 594                      SMTP_C_ReadServerStatus,
 595                      SMTP_C_DNSFail,
 596                      SMTP_C_DispatchWriteDone,
 597                      SMTP_C_DispatchReadDone,
 598                      SMTP_C_Terminate,
 599                      SMTP_C_TerminateDB,
 600                      SMTP_C_ConnFail,
 601                      SMTP_C_Timeout,
 602                      SMTP_C_Shutdown);
 603
 604         Msg->IO.ErrMsg = Msg->MyQEntry->StatusMessage;
 605
 606         return Msg;
 607 }
 608
 609 void smtp_try_one_queue_entry(OneQueItem *MyQItem,
 610                               MailQEntry *MyQEntry,
 611                               StrBuf *MsgText,
 612                         /*KeepMsgText allows us to use MsgText as ours.*/
 613                               int KeepMsgText,
 614                               int MsgCount)
 615 {
 616         SmtpOutMsg *Msg;
 617
 618         syslog(LOG_DEBUG, "SMTP: %s\n", __FUNCTION__);
 619
 620         Msg = new_smtp_outmsg(MyQItem, MyQEntry, MsgCount);
 621         if (KeepMsgText) Msg->msgtext = MsgText;
 622         else             Msg->msgtext = NewStrBufDup(MsgText);
 623
 624         if (smtp_resolve_recipients(Msg)) {
 625
 626                 safestrncpy(
 627                         ((CitContext *)Msg->IO.CitContext)->cs_host,
 628                         Msg->node,
 629                         sizeof(((CitContext *)
 630                                 Msg->IO.CitContext)->cs_host));
 631
 632                 syslog(LOG_DEBUG, "SMTP Starting: [%ld] <%s> CC <%d> \n",
 633                        Msg->MyQItem->MessageID,
 634                        ChrPtr(Msg->MyQEntry->Recipient),
 635                        ((CitContext*)Msg->IO.CitContext)->cs_pid);
 636                 if (Msg->pCurrRelay == NULL)
 637                         QueueEventContext(&Msg->IO,
 638                                           resolve_mx_records);
 639                 else { /* oh... via relay host */
 640                         if (Msg->pCurrRelay->IsIP) {
 641                                 QueueEventContext(&Msg->IO,
 642                                                   mx_connect_ip);
 643                         }
 644                         else {
 645                                 /* uneducated admin has chosen to
 646                                    add DNS to the equation... */
 647                                 QueueEventContext(&Msg->IO,
 648                                                   get_one_mx_host_ip);
 649                         }
 650                 }
 651         }
 652         else {
 653                 /* No recipients? well fail then. */
 654                 if ((Msg==NULL) ||
 655                     (Msg->MyQEntry == NULL)) {
 656                         Msg->MyQEntry->Status = 5;
 657                         StrBufPlain(Msg->MyQEntry->StatusMessage,
 658                                     HKEY("Invalid Recipient!"));
 659                 }
 660                 FinalizeMessageSend_1(&Msg->IO);
 661                 FinalizeMessageSend_DB_1(&Msg->IO);
 662                 FinalizeMessageSend_DB_2(&Msg->IO);
 663                 FinalizeMessageSend_DB_3(&Msg->IO);
 664                 FinalizeMessageSend_DB(&Msg->IO);
 665         }
 666 }
 667
 668
 669
 670
 671
 672
 673 /*****************************************************************************/
 674 /*                     SMTP CLIENT DISPATCHER                                */
 675 /*****************************************************************************/
 676
 677 void SMTPSetTimeout(eNextState NextTCPState, SmtpOutMsg *Msg)
 678 {
 679         double Timeout = 0.0;
 680         AsyncIO *IO = &Msg->IO;
 681
 682         EVS_syslog(LOG_DEBUG, "SMTP: %s\n", __FUNCTION__);
 683
 684         switch (NextTCPState) {
 685         case eSendFile:
 686         case eSendReply:
 687         case eSendMore:
 688                 Timeout = SMTP_C_SendTimeouts[Msg->State];
 689                 if (Msg->State == eDATABody) {
 690                         /* if we're sending a huge message,
 691                          * we need more time.
 692                          */
 693                         Timeout += StrLength(Msg->msgtext) / 512;
 694                 }
 695                 break;
 696         case eReadMessage:
 697                 Timeout = SMTP_C_ReadTimeouts[Msg->State];
 698                 if (Msg->State == eDATATerminateBody) {
 699                         /*
 700                          * some mailservers take a nap before accepting
 701                          * the message content inspection and such.
 702                          */
 703                         Timeout += StrLength(Msg->msgtext) / 512;
 704                 }
 705                 break;
 706         case eSendDNSQuery:
 707         case eReadDNSReply:
 708         case eDBQuery:
 709         case eReadFile:
 710         case eReadMore:
 711         case eReadPayload:
 712         case eConnect:
 713         case eTerminateConnection:
 714         case eAbort:
 715                 return;
 716         }
 717         SetNextTimeout(&Msg->IO, Timeout);
 718 }
 719 eNextState SMTP_C_DispatchReadDone(AsyncIO *IO)
 720 {
 721         EVS_syslog(LOG_DEBUG, "SMTP: %s\n", __FUNCTION__);
 722         SmtpOutMsg *Msg = IO->Data;
 723         eNextState rc;
 724
 725         rc = ReadHandlers[Msg->State](Msg);
 726         if (rc != eAbort)
 727         {
 728                 Msg->State++;
 729                 SMTPSetTimeout(rc, Msg);
 730         }
 731         return rc;
 732 }
 733 eNextState SMTP_C_DispatchWriteDone(AsyncIO *IO)
 734 {
 735         EVS_syslog(LOG_DEBUG, "SMTP: %s\n", __FUNCTION__);
 736         SmtpOutMsg *Msg = IO->Data;
 737         eNextState rc;
 738
 739         rc = SendHandlers[Msg->State](Msg);
 740         SMTPSetTimeout(rc, Msg);
 741         return rc;
 742 }
 743
 744
 745 /*****************************************************************************/
 746 /*                     SMTP CLIENT ERROR CATCHERS                            */
 747 /*****************************************************************************/
 748 eNextState SMTP_C_Terminate(AsyncIO *IO)
 749 {
 750         SmtpOutMsg *Msg = IO->Data;
 751
 752         EVS_syslog(LOG_DEBUG, "SMTP: %s\n", __FUNCTION__);
 753         return FinalizeMessageSend(Msg);
 754 }
 755 eNextState SMTP_C_TerminateDB(AsyncIO *IO)
 756 {
 757         EVS_syslog(LOG_DEBUG, "SMTP: %s\n", __FUNCTION__);
 758         return FinalizeMessageSend_DB(IO);
 759 }
 760 eNextState SMTP_C_Timeout(AsyncIO *IO)
 761 {
 762         SmtpOutMsg *Msg = IO->Data;
 763
 764         Msg->MyQEntry->Status = 4;
 765         EVS_syslog(LOG_DEBUG, "SMTP: %s\n", __FUNCTION__);
 766         StrBufPlain(IO->ErrMsg, CKEY(ReadErrors[Msg->State]));
 767         if (Msg->State > eRCPT)
 768                 return eAbort;
 769         else
 770                 return FailOneAttempt(IO);
 771 }
 772 eNextState SMTP_C_ConnFail(AsyncIO *IO)
 773 {
 774         SmtpOutMsg *Msg = IO->Data;
 775
 776         Msg->MyQEntry->Status = 4;
 777         EVS_syslog(LOG_DEBUG, "SMTP: %s\n", __FUNCTION__);
 778         StrBufPlain(IO->ErrMsg, CKEY(ReadErrors[Msg->State]));
 779         return FailOneAttempt(IO);
 780 }
 781 eNextState SMTP_C_DNSFail(AsyncIO *IO)
 782 {
 783         SmtpOutMsg *Msg = IO->Data;
 784         Msg->MyQEntry->Status = 4;
 785         EVS_syslog(LOG_DEBUG, "SMTP: %s\n", __FUNCTION__);
 786         return FailOneAttempt(IO);
 787 }
 788 eNextState SMTP_C_Shutdown(AsyncIO *IO)
 789 {
 790         EVS_syslog(LOG_DEBUG, "SMTP: %s\n", __FUNCTION__);
 791         SmtpOutMsg *Msg = IO->Data;
 792
 793         Msg->MyQEntry->Status = 3;
 794         StrBufPlain(Msg->MyQEntry->StatusMessage,
 795                     HKEY("server shutdown during message submit."));
 796         return FinalizeMessageSend(Msg);
 797 }
 798
 799
 800 /**
 801  * @brief lineread Handler;
 802  * understands when to read more SMTP lines, and when this is a one-lined reply.
 803  */
 804 eReadState SMTP_C_ReadServerStatus(AsyncIO *IO)
 805 {
 806         eReadState Finished = eBufferNotEmpty;
 807
 808         while (Finished == eBufferNotEmpty) {
 809                 Finished = StrBufChunkSipLine(IO->IOBuf, &IO->RecvBuf);
 810
 811                 switch (Finished) {
 812                 case eMustReadMore: /// read new from socket...
 813                         return Finished;
 814                         break;
 815                 case eBufferNotEmpty: /* shouldn't happen... */
 816                 case eReadSuccess: /// done for now...
 817                         if (StrLength(IO->IOBuf) < 4)
 818                                 continue;
 819                         if (ChrPtr(IO->IOBuf)[3] == '-')
 820                                 Finished = eBufferNotEmpty;
 821                         else
 822                                 return Finished;
 823                         break;
 824                 case eReadFail: /// WHUT?
 825                         ///todo: shut down!
 826                         break;
 827                 }
 828         }
 829         return Finished;
 830 }
 831
 832 CTDL_MODULE_INIT(smtp_eventclient)
 833 {
 834         return "smtpeventclient";
 835 }