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 ConstStr SMTPStates[] = {
  94         {HKEY("looking up mx - record")},
  95         {HKEY("evaluating what to do next")},
  96         {HKEY("looking up a - record")},
  97         {HKEY("looking up aaaa - record")},
  98         {HKEY("connecting remote")},
  99         {HKEY("smtp conversation ongoing")},
 100         {HKEY("smtp sending maildata")},
 101         {HKEY("smtp sending done")},
 102         {HKEY("smtp successfully finished")},
 103         {HKEY("failed one attempt")},
 104         {HKEY("failed temporarily")},
 105         {HKEY("failed permanently")}
 106 };
 107
 108 void SetSMTPState(AsyncIO *IO, smtpstate State)
 109 {
 110         CitContext* CCC = IO->CitContext;
 111         memcpy(CCC->cs_clientname, SMTPStates[State].Key, SMTPStates[State].len + 1);
 112 }
 113
 114 int SMTPClientDebugEnabled = 0;
 115 void DeleteSmtpOutMsg(void *v)
 116 {
 117         SmtpOutMsg *Msg = v;
 118         AsyncIO *IO = &Msg->IO;
 119         EV_syslog(LOG_DEBUG, "%s Exit\n", __FUNCTION__);
 120
 121         /* these are kept in our own space and free'd below */
 122         Msg->IO.ConnectMe = NULL;
 123
 124         ares_free_data(Msg->AllMX);
 125         if (Msg->HostLookup.VParsedDNSReply != NULL)
 126                 Msg->HostLookup.DNSReplyFree(Msg->HostLookup.VParsedDNSReply);
 127         FreeURL(&Msg->Relay);
 128         FreeStrBuf(&Msg->msgtext);
 129         FreeAsyncIOContents(&Msg->IO);
 130         memset (Msg, 0, sizeof(SmtpOutMsg)); /* just to be shure... */
 131         free(Msg);
 132 }
 133
 134 eNextState SMTP_C_Shutdown(AsyncIO *IO);
 135 eNextState SMTP_C_Timeout(AsyncIO *IO);
 136 eNextState SMTP_C_ConnFail(AsyncIO *IO);
 137 eNextState SMTP_C_DispatchReadDone(AsyncIO *IO);
 138 eNextState SMTP_C_DispatchWriteDone(AsyncIO *IO);
 139 eNextState SMTP_C_DNSFail(AsyncIO *IO);
 140 eNextState SMTP_C_Terminate(AsyncIO *IO);
 141 eNextState SMTP_C_TerminateDB(AsyncIO *IO);
 142 eReadState SMTP_C_ReadServerStatus(AsyncIO *IO);
 143
 144 eNextState mx_connect_ip(AsyncIO *IO);
 145 eNextState get_one_mx_host_ip(AsyncIO *IO);
 146
 147 /******************************************************************************
 148  * So, we're finished with sending (regardless of success or failure)         *
 149  * This Message might be referenced by several Queue-Items, if we're the last,*
 150  * we need to free the memory and send bounce messages (on terminal failure)  *
 151  * else we just free our SMTP-Message struct.                                 *
 152  ******************************************************************************/
 153 eNextState FinalizeMessageSend_DB(AsyncIO *IO)
 154 {
 155         const char *Status;
 156         SmtpOutMsg *Msg = IO->Data;
 157
 158         if (Msg->MyQEntry->Status == 2) {
 159                 SetSMTPState(IO, eSTMPfinished);
 160                 Status = "Delivery successful.";
 161         }
 162         else if (Msg->MyQEntry->Status == 5) {
 163                 SetSMTPState(IO, eSMTPFailTotal);
 164                 Status = "Delivery failed permanently; giving up.";
 165         }
 166         else {
 167                 SetSMTPState(IO, eSMTPFailTemporary);
 168                 Status = "Delivery failed temporarily; will retry later.";
 169         }
 170
 171         EVS_syslog(LOG_INFO,
 172                    "%s Time[%fs] Recipient <%s> @ <%s> (%s) Status message: %s\n",
 173                    Status,
 174                    Msg->IO.Now - Msg->IO.StartIO,
 175                    Msg->user,
 176                    Msg->node,
 177                    Msg->name,
 178                    ChrPtr(Msg->MyQEntry->StatusMessage));
 179
 180
 181         Msg->IDestructQueItem = DecreaseQReference(Msg->MyQItem);
 182
 183         Msg->nRemain = CountActiveQueueEntries(Msg->MyQItem, 0);
 184
 185         if (Msg->MyQEntry->Active &&
 186             !Msg->MyQEntry->StillActive &&
 187             CheckQEntryIsBounce(Msg->MyQEntry))
 188         {
 189                 /* are we casue for a bounce mail? */
 190                 Msg->MyQItem->SendBounceMail |= (1<<Msg->MyQEntry->Status);
 191         }
 192
 193         if ((Msg->nRemain > 0) || Msg->IDestructQueItem)
 194                 Msg->QMsgData = SerializeQueueItem(Msg->MyQItem);
 195         else
 196                 Msg->QMsgData = NULL;
 197
 198         /*
 199          * Uncompleted delivery instructions remain, so delete the old
 200          * instructions and replace with the updated ones.
 201          */
 202         EVS_syslog(LOG_DEBUG, "%ld", Msg->MyQItem->QueMsgID);
 203         CtdlDeleteMessages(SMTP_SPOOLOUT_ROOM, &Msg->MyQItem->QueMsgID, 1, "");
 204         Msg->MyQItem->QueMsgID = -1;
 205
 206         if (Msg->IDestructQueItem)
 207                 smtpq_do_bounce(Msg->MyQItem, Msg->msgtext, Msg->pCurrRelay);
 208
 209         if (Msg->nRemain > 0)
 210         {
 211                 struct CtdlMessage *msg;
 212                 msg = malloc(sizeof(struct CtdlMessage));
 213                 memset(msg, 0, sizeof(struct CtdlMessage));
 214                 msg->cm_magic = CTDLMESSAGE_MAGIC;
 215                 msg->cm_anon_type = MES_NORMAL;
 216                 msg->cm_format_type = FMT_RFC822;
 217                 msg->cm_fields['M'] = SmashStrBuf(&Msg->QMsgData);
 218                 msg->cm_fields['U'] = strdup("QMSG");
 219                 Msg->MyQItem->QueMsgID =
 220                         CtdlSubmitMsg(msg, NULL, SMTP_SPOOLOUT_ROOM, QP_EADDR);
 221                 EVS_syslog(LOG_DEBUG, "%ld", Msg->MyQItem->QueMsgID);
 222                 CtdlFreeMessage(msg);
 223         }
 224         else {
 225                 CtdlDeleteMessages(SMTP_SPOOLOUT_ROOM,
 226                                    &Msg->MyQItem->MessageID,
 227                                    1,
 228                                    "");
 229                 FreeStrBuf(&Msg->QMsgData);
 230         }
 231
 232         RemoveContext(Msg->IO.CitContext);
 233         return eAbort;
 234 }
 235
 236 eNextState Terminate(AsyncIO *IO)
 237 {
 238         SmtpOutMsg *Msg = IO->Data;
 239
 240         if (Msg->IDestructQueItem)
 241                 RemoveQItem(Msg->MyQItem);
 242
 243         DeleteSmtpOutMsg(Msg);
 244         return eAbort;
 245 }
 246 eNextState FinalizeMessageSend(SmtpOutMsg *Msg)
 247 {
 248         /* hand over to DB Queue */
 249         return QueueDBOperation(&Msg->IO, FinalizeMessageSend_DB);
 250 }
 251
 252 eNextState FailOneAttempt(AsyncIO *IO)
 253 {
 254         SmtpOutMsg *Msg = IO->Data;
 255
 256         SetSMTPState(IO, eSTMPfailOne);
 257         if (Msg->MyQEntry->Status == 2)
 258                 return eAbort;
 259
 260         /*
 261          * possible ways here:
 262          * - connection timeout
 263          * - dns lookup failed
 264          */
 265         StopClientWatchers(IO, 1);
 266
 267         Msg->MyQEntry->nAttempt ++;
 268         if (Msg->MyQEntry->AllStatusMessages == NULL)
 269                 Msg->MyQEntry->AllStatusMessages = NewStrBuf();
 270
 271         StrBufAppendPrintf(Msg->MyQEntry->AllStatusMessages, "%ld) ", Msg->MyQEntry->nAttempt);
 272         StrBufAppendBuf(Msg->MyQEntry->AllStatusMessages, Msg->MyQEntry->StatusMessage, 0);
 273         StrBufAppendBufPlain(Msg->MyQEntry->AllStatusMessages, HKEY("; "), 0);
 274
 275         if (Msg->pCurrRelay != NULL)
 276                 Msg->pCurrRelay = Msg->pCurrRelay->Next;
 277         if ((Msg->pCurrRelay != NULL) &&
 278             !Msg->pCurrRelay->IsRelay &&
 279             Msg->MyQItem->HaveRelay)
 280         {
 281                 EVS_syslog(LOG_DEBUG, "%s Aborting; last relay failed.\n", __FUNCTION__);
 282                 return eAbort;
 283         }
 284
 285         if (Msg->pCurrRelay == NULL) {
 286                 EVS_syslog(LOG_DEBUG, "%s Aborting\n", __FUNCTION__);
 287                 return eAbort;
 288         }
 289         if (Msg->pCurrRelay->IsIP) {
 290                 EVS_syslog(LOG_DEBUG, "%s connecting IP\n", __FUNCTION__);
 291                 return mx_connect_ip(IO);
 292         }
 293         else {
 294                 EVS_syslog(LOG_DEBUG,
 295                            "%s resolving next MX Record\n",
 296                            __FUNCTION__);
 297                 return get_one_mx_host_ip(IO);
 298         }
 299 }
 300
 301
 302 void SetConnectStatus(AsyncIO *IO)
 303 {
 304         SmtpOutMsg *Msg = IO->Data;
 305         char buf[256];
 306         void *src;
 307
 308         buf[0] = '\0';
 309
 310         if (IO->ConnectMe->IPv6) {
 311                 src = &IO->ConnectMe->Addr.sin6_addr;
 312         }
 313         else {
 314                 struct sockaddr_in *addr;
 315
 316                 addr = (struct sockaddr_in *)&IO->ConnectMe->Addr;
 317                 src = &addr->sin_addr.s_addr;
 318         }
 319
 320         inet_ntop((IO->ConnectMe->IPv6)?AF_INET6:AF_INET,
 321                   src,
 322                   buf,
 323                   sizeof(buf));
 324
 325         if (Msg->mx_host == NULL)
 326                 Msg->mx_host = "<no MX-Record>";
 327
 328         EVS_syslog(LOG_INFO,
 329                   "connecting to %s [%s]:%d ...\n",
 330                   Msg->mx_host,
 331                   buf,
 332                   Msg->IO.ConnectMe->Port);
 333
 334         Msg->MyQEntry->Status = 4;
 335         StrBufPrintf(Msg->MyQEntry->StatusMessage,
 336                      "Timeout while connecting %s [%s]:%d ",
 337                      Msg->mx_host,
 338                      buf,
 339                      Msg->IO.ConnectMe->Port);
 340         Msg->IO.NextState = eConnect;
 341 }
 342
 343 /*****************************************************************************
 344  * So we connect our Relay IP here.                                          *
 345  *****************************************************************************/
 346 eNextState mx_connect_ip(AsyncIO *IO)
 347 {
 348         SmtpOutMsg *Msg = IO->Data;
 349         SetSMTPState(IO, eSTMPconnecting);
 350
 351         EVS_syslog(LOG_DEBUG, "%s\n", __FUNCTION__);
 352
 353         IO->ConnectMe = Msg->pCurrRelay;
 354         Msg->State = eConnectMX;
 355
 356         SetConnectStatus(IO);
 357
 358         return EvConnectSock(IO,
 359                              SMTP_C_ConnTimeout,
 360                              SMTP_C_ReadTimeouts[0],
 361                              1);
 362 }
 363
 364 eNextState get_one_mx_host_ip_done(AsyncIO *IO)
 365 {
 366         SmtpOutMsg *Msg = IO->Data;
 367         struct hostent *hostent;
 368
 369         IO->ConnectMe = Msg->pCurrRelay;
 370
 371         QueryCbDone(IO);
 372         EVS_syslog(LOG_DEBUG, "%s Time[%fs]\n",
 373                    __FUNCTION__,
 374                    IO->Now - IO->DNS.Start);
 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(Msg->IO.ConnectMe->Port);
 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(Msg->IO.ConnectMe->Port);
 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                 SetSMTPState(IO, eSTMPfailOne);
 417                 if (Msg->HostLookup.VParsedDNSReply != NULL) {
 418                         Msg->HostLookup.DNSReplyFree(Msg->HostLookup.VParsedDNSReply);
 419                         Msg->HostLookup.VParsedDNSReply = NULL;
 420                 }
 421                 return FailOneAttempt(IO);
 422         }
 423 }
 424
 425 eNextState get_one_mx_host_ip(AsyncIO *IO)
 426 {
 427         SmtpOutMsg * Msg = IO->Data;
 428         /*
 429          * here we start with the lookup of one host. it might be...
 430          * - the relay host *sigh*
 431          * - the direct hostname if there was no mx record
 432          * - one of the mx'es
 433          */
 434         SetSMTPState(IO, (Msg->pCurrRelay->IPv6)?eSTMPalookup:eSTMPaaaalookup);
 435
 436         EVS_syslog(LOG_DEBUG, "%s\n", __FUNCTION__);
 437
 438         EVS_syslog(LOG_DEBUG,
 439                   "looking up %s-Record %s : %d ...\n",
 440                   (Msg->pCurrRelay->IPv6)? "aaaa": "a",
 441                   Msg->pCurrRelay->Host,
 442                   Msg->pCurrRelay->Port);
 443
 444         if (!QueueQuery((Msg->pCurrRelay->IPv6)? ns_t_aaaa : ns_t_a,
 445                         Msg->pCurrRelay->Host,
 446                         &Msg->IO,
 447                         &Msg->HostLookup,
 448                         get_one_mx_host_ip_done))
 449         {
 450                 Msg->MyQEntry->Status = 5;
 451                 StrBufPrintf(Msg->MyQEntry->StatusMessage,
 452                              "No MX hosts found for <%s>", Msg->node);
 453                 Msg->IO.NextState = eTerminateConnection;
 454                 return IO->NextState;
 455         }
 456         IO->NextState = eReadDNSReply;
 457         return IO->NextState;
 458 }
 459
 460
 461 /*****************************************************************************
 462  * here we try to find out about the MX records for our recipients.          *
 463  *****************************************************************************/
 464 eNextState smtp_resolve_mx_record_done(AsyncIO *IO)
 465 {
 466         SmtpOutMsg * Msg = IO->Data;
 467         ParsedURL **pp;
 468
 469         QueryCbDone(IO);
 470
 471         EVS_syslog(LOG_DEBUG, "%s Time[%fs]\n",
 472                    __FUNCTION__,
 473                    IO->Now - IO->DNS.Start);
 474
 475         pp = &Msg->Relay;
 476         while ((pp != NULL) && (*pp != NULL) && ((*pp)->Next != NULL))
 477                 pp = &(*pp)->Next;
 478
 479         if ((IO->DNS.Query->DNSStatus == ARES_SUCCESS) &&
 480             (IO->DNS.Query->VParsedDNSReply != NULL))
 481         { /* ok, we found mx records. */
 482
 483                 Msg->CurrMX
 484                         = Msg->AllMX
 485                         = IO->DNS.Query->VParsedDNSReply;
 486                 while (Msg->CurrMX) {
 487                         int i;
 488                         for (i = 0; i < 2; i++) {
 489                                 ParsedURL *p;
 490
 491                                 p = (ParsedURL*) malloc(sizeof(ParsedURL));
 492                                 memset(p, 0, sizeof(ParsedURL));
 493                                 p->Priority = Msg->CurrMX->priority;
 494                                 p->IsIP = 0;
 495                                 p->Port = DefaultMXPort;
 496                                 p->IPv6 = i == 1;
 497                                 p->Host = Msg->CurrMX->host;
 498                                 if (*pp == NULL)
 499                                         *pp = p;
 500                                 else {
 501                                         ParsedURL *ppp = *pp;
 502
 503                                         while ((ppp->Next != NULL) &&
 504                                                (ppp->Next->Priority <= p->Priority))
 505                                                ppp = ppp->Next;
 506                                         if ((ppp == *pp) &&
 507                                             (ppp->Priority > p->Priority)) {
 508                                                 p->Next = *pp;
 509                                                 *pp = p;
 510                                         }
 511                                         else {
 512                                                 p->Next = ppp->Next;
 513                                                 ppp->Next = p;
 514                                         }
 515                                 }
 516                         }
 517                         Msg->CurrMX    = Msg->CurrMX->next;
 518                 }
 519                 Msg->CXFlags   = Msg->CXFlags & F_HAVE_MX;
 520         }
 521         else { /* else fall back to the plain hostname */
 522                 int i;
 523                 for (i = 0; i < 2; i++) {
 524                         ParsedURL *p;
 525
 526                         p = (ParsedURL*) malloc(sizeof(ParsedURL));
 527                         memset(p, 0, sizeof(ParsedURL));
 528                         p->IsIP = 0;
 529                         p->Port = DefaultMXPort;
 530                         p->IPv6 = i == 1;
 531                         p->Host = Msg->node;
 532
 533                         *pp = p;
 534                         pp = &p->Next;
 535                 }
 536                 Msg->CXFlags   = Msg->CXFlags & F_DIRECT;
 537         }
 538         if (Msg->MyQItem->FallBackHost != NULL)
 539         {
 540                 Msg->MyQItem->FallBackHost->Next = *pp;
 541                 *pp = Msg->MyQItem->FallBackHost;
 542         }
 543         Msg->pCurrRelay = Msg->Relay;
 544         return get_one_mx_host_ip(IO);
 545 }
 546
 547 eNextState resolve_mx_records(AsyncIO *IO)
 548 {
 549         SmtpOutMsg * Msg = IO->Data;
 550
 551         SetSMTPState(IO, eSTMPmxlookup);
 552
 553         EVS_syslog(LOG_DEBUG, "%s\n", __FUNCTION__);
 554         /* start resolving MX records here. */
 555         if (!QueueQuery(ns_t_mx,
 556                         Msg->node,
 557                         &Msg->IO,
 558                         &Msg->MxLookup,
 559                         smtp_resolve_mx_record_done))
 560         {
 561                 Msg->MyQEntry->Status = 5;
 562                 StrBufPrintf(Msg->MyQEntry->StatusMessage,
 563                              "No MX hosts found for <%s>", Msg->node);
 564                 return IO->NextState;
 565         }
 566         Msg->IO.NextState = eReadDNSReply;
 567         return IO->NextState;
 568 }
 569
 570
 571
 572 /******************************************************************************
 573  *  so, we're going to start a SMTP delivery.  lets get it on.                *
 574  ******************************************************************************/
 575
 576 SmtpOutMsg *new_smtp_outmsg(OneQueItem *MyQItem,
 577                             MailQEntry *MyQEntry,
 578                             int MsgCount)
 579 {
 580         SmtpOutMsg * Msg;
 581
 582         Msg = (SmtpOutMsg *) malloc(sizeof(SmtpOutMsg));
 583         if (Msg == NULL)
 584                 return NULL;
 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         SMTPC_syslog(LOG_DEBUG, "%s\n", __FUNCTION__);
 620
 621         Msg = new_smtp_outmsg(MyQItem, MyQEntry, MsgCount);
 622         if (Msg == NULL) {
 623                 SMTPC_syslog(LOG_DEBUG, "%s Failed to alocate message context.\n", __FUNCTION__);
 624                 if (KeepMsgText)
 625                         FreeStrBuf (&MsgText);
 626                 return;
 627         }
 628         if (KeepMsgText) Msg->msgtext = MsgText;
 629         else             Msg->msgtext = NewStrBufDup(MsgText);
 630
 631         if (smtp_resolve_recipients(Msg) &&
 632             (!MyQItem->HaveRelay ||
 633              (MyQItem->URL != NULL)))
 634         {
 635                 safestrncpy(
 636                         ((CitContext *)Msg->IO.CitContext)->cs_host,
 637                         Msg->node,
 638                         sizeof(((CitContext *)
 639                                 Msg->IO.CitContext)->cs_host));
 640
 641                 SMTPC_syslog(LOG_DEBUG, "Starting: [%ld] <%s> CC <%d> \n",
 642                              Msg->MyQItem->MessageID,
 643                              ChrPtr(Msg->MyQEntry->Recipient),
 644                              ((CitContext*)Msg->IO.CitContext)->cs_pid);
 645                 if (Msg->pCurrRelay == NULL) {
 646                         SetSMTPState(&Msg->IO, eSTMPmxlookup);
 647                         QueueEventContext(&Msg->IO,
 648                                           resolve_mx_records);
 649                 }
 650                 else { /* oh... via relay host */
 651                         if (Msg->pCurrRelay->IsIP) {
 652                                 SetSMTPState(&Msg->IO, eSTMPconnecting);
 653                                 QueueEventContext(&Msg->IO,
 654                                                   mx_connect_ip);
 655                         }
 656                         else {
 657                                 SetSMTPState(&Msg->IO, eSTMPalookup);
 658                                 /* uneducated admin has chosen to
 659                                    add DNS to the equation... */
 660                                 QueueEventContext(&Msg->IO,
 661                                                   get_one_mx_host_ip);
 662                         }
 663                 }
 664         }
 665         else {
 666                 SetSMTPState(&Msg->IO, eSMTPFailTotal);
 667                 /* No recipients? well fail then. */
 668                 if (Msg->MyQEntry != NULL) {
 669                         Msg->MyQEntry->Status = 5;
 670                         if (StrLength(Msg->MyQEntry->StatusMessage) == 0)
 671                                 StrBufPlain(Msg->MyQEntry->StatusMessage,
 672                                             HKEY("Invalid Recipient!"));
 673                 }
 674                 FinalizeMessageSend_DB(&Msg->IO);
 675                 DeleteSmtpOutMsg(Msg);
 676         }
 677 }
 678
 679
 680
 681
 682
 683
 684 /*****************************************************************************/
 685 /*                     SMTP CLIENT DISPATCHER                                */
 686 /*****************************************************************************/
 687
 688 void SMTPSetTimeout(eNextState NextTCPState, SmtpOutMsg *Msg)
 689 {
 690         double Timeout = 0.0;
 691         AsyncIO *IO = &Msg->IO;
 692
 693         EVS_syslog(LOG_DEBUG, "%s\n", __FUNCTION__);
 694
 695         switch (NextTCPState) {
 696         case eSendFile:
 697         case eSendReply:
 698         case eSendMore:
 699                 Timeout = SMTP_C_SendTimeouts[Msg->State];
 700                 if (Msg->State == eDATABody) {
 701                         /* if we're sending a huge message,
 702                          * we need more time.
 703                          */
 704                         Timeout += StrLength(Msg->msgtext) / 512;
 705                 }
 706                 break;
 707         case eReadMessage:
 708                 Timeout = SMTP_C_ReadTimeouts[Msg->State];
 709                 if (Msg->State == eDATATerminateBody) {
 710                         /*
 711                          * some mailservers take a nap before accepting
 712                          * the message content inspection and such.
 713                          */
 714                         Timeout += StrLength(Msg->msgtext) / 512;
 715                 }
 716                 break;
 717         case eSendDNSQuery:
 718         case eReadDNSReply:
 719         case eDBQuery:
 720         case eReadFile:
 721         case eReadMore:
 722         case eReadPayload:
 723         case eConnect:
 724         case eTerminateConnection:
 725         case eAbort:
 726                 return;
 727         }
 728         SetNextTimeout(&Msg->IO, Timeout);
 729 }
 730 eNextState SMTP_C_DispatchReadDone(AsyncIO *IO)
 731 {
 732         EVS_syslog(LOG_DEBUG, "%s\n", __FUNCTION__);
 733         SmtpOutMsg *Msg = IO->Data;
 734         eNextState rc;
 735
 736         rc = ReadHandlers[Msg->State](Msg);
 737         if (rc != eAbort)
 738         {
 739                 Msg->State++;
 740                 SMTPSetTimeout(rc, Msg);
 741         }
 742         return rc;
 743 }
 744 eNextState SMTP_C_DispatchWriteDone(AsyncIO *IO)
 745 {
 746         EVS_syslog(LOG_DEBUG, "%s\n", __FUNCTION__);
 747         SmtpOutMsg *Msg = IO->Data;
 748         eNextState rc;
 749
 750         rc = SendHandlers[Msg->State](Msg);
 751         SMTPSetTimeout(rc, Msg);
 752         return rc;
 753 }
 754
 755
 756 /*****************************************************************************/
 757 /*                     SMTP CLIENT ERROR CATCHERS                            */
 758 /*****************************************************************************/
 759 eNextState SMTP_C_Terminate(AsyncIO *IO)
 760 {
 761         SmtpOutMsg *Msg = IO->Data;
 762
 763         EVS_syslog(LOG_DEBUG, "%s\n", __FUNCTION__);
 764         return FinalizeMessageSend(Msg);
 765 }
 766 eNextState SMTP_C_TerminateDB(AsyncIO *IO)
 767 {
 768         EVS_syslog(LOG_DEBUG, "%s\n", __FUNCTION__);
 769         return Terminate(IO);
 770 }
 771 eNextState SMTP_C_Timeout(AsyncIO *IO)
 772 {
 773         SmtpOutMsg *Msg = IO->Data;
 774
 775         Msg->MyQEntry->Status = 4;
 776         EVS_syslog(LOG_DEBUG, "%s\n", __FUNCTION__);
 777         StrBufPlain(IO->ErrMsg, CKEY(ReadErrors[Msg->State]));
 778         if (Msg->State > eRCPT)
 779                 return eAbort;
 780         else
 781                 return FailOneAttempt(IO);
 782 }
 783 eNextState SMTP_C_ConnFail(AsyncIO *IO)
 784 {
 785         SmtpOutMsg *Msg = IO->Data;
 786
 787         Msg->MyQEntry->Status = 4;
 788         EVS_syslog(LOG_DEBUG, "%s\n", __FUNCTION__);
 789         StrBufPlain(IO->ErrMsg, CKEY(ReadErrors[Msg->State]));
 790         return FailOneAttempt(IO);
 791 }
 792 eNextState SMTP_C_DNSFail(AsyncIO *IO)
 793 {
 794         SmtpOutMsg *Msg = IO->Data;
 795         Msg->MyQEntry->Status = 4;
 796         EVS_syslog(LOG_DEBUG, "%s\n", __FUNCTION__);
 797         return FailOneAttempt(IO);
 798 }
 799 eNextState SMTP_C_Shutdown(AsyncIO *IO)
 800 {
 801         EVS_syslog(LOG_DEBUG, "%s\n", __FUNCTION__);
 802         SmtpOutMsg *Msg = IO->Data;
 803
 804         switch (IO->NextState) {
 805         case eSendDNSQuery:
 806         case eReadDNSReply:
 807
 808                 /* todo: abort c-ares */
 809         case eConnect:
 810         case eSendReply:
 811         case eSendMore:
 812         case eSendFile:
 813         case eReadMessage:
 814         case eReadMore:
 815         case eReadPayload:
 816         case eReadFile:
 817                 StopClientWatchers(IO, 1);
 818                 break;
 819         case eDBQuery:
 820
 821                 break;
 822         case eTerminateConnection:
 823         case eAbort:
 824                 break;
 825         }
 826         Msg->MyQEntry->Status = 3;
 827         StrBufPlain(Msg->MyQEntry->StatusMessage,
 828                     HKEY("server shutdown during message submit."));
 829         return FinalizeMessageSend(Msg);
 830 }
 831
 832
 833 /**
 834  * @brief lineread Handler;
 835  * understands when to read more SMTP lines, and when this is a one-lined reply.
 836  */
 837 eReadState SMTP_C_ReadServerStatus(AsyncIO *IO)
 838 {
 839         eReadState Finished = eBufferNotEmpty;
 840
 841         while (Finished == eBufferNotEmpty) {
 842                 Finished = StrBufChunkSipLine(IO->IOBuf, &IO->RecvBuf);
 843
 844                 switch (Finished) {
 845                 case eMustReadMore: /// read new from socket...
 846                         return Finished;
 847                         break;
 848                 case eBufferNotEmpty: /* shouldn't happen... */
 849                 case eReadSuccess: /// done for now...
 850                         if (StrLength(IO->IOBuf) < 4)
 851                                 continue;
 852                         if (ChrPtr(IO->IOBuf)[3] == '-')
 853                                 Finished = eBufferNotEmpty;
 854                         else
 855                                 return Finished;
 856                         break;
 857                 case eReadFail: /// WHUT?
 858                         ///todo: shut down!
 859                         break;
 860                 }
 861         }
 862         return Finished;
 863 }
 864
 865 void LogDebugEnableSMTPClient(const int n)
 866 {
 867         SMTPClientDebugEnabled = n;
 868 }
 869
 870 CTDL_MODULE_INIT(smtp_eventclient)
 871 {
 872         if (!threading)
 873                 CtdlRegisterDebugFlagHook(HKEY("smtpeventclient"), LogDebugEnableSMTPClient, &SMTPClientDebugEnabled);
 874         return "smtpeventclient";
 875 }