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