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         if (Msg->pCurrRelay != NULL)
 268                 Msg->pCurrRelay = Msg->pCurrRelay->Next;
 269         if ((Msg->pCurrRelay != NULL) &&
 270             !Msg->pCurrRelay->IsRelay &&
 271             Msg->MyQItem->HaveRelay)
 272         {
 273                 EVS_syslog(LOG_DEBUG, "%s Aborting; last relay failed.\n", __FUNCTION__);
 274                 return eAbort;
 275         }
 276
 277         if (Msg->pCurrRelay == NULL) {
 278                 EVS_syslog(LOG_DEBUG, "%s Aborting\n", __FUNCTION__);
 279                 return eAbort;
 280         }
 281         if (Msg->pCurrRelay->IsIP) {
 282                 EVS_syslog(LOG_DEBUG, "%s connecting IP\n", __FUNCTION__);
 283                 return mx_connect_ip(IO);
 284         }
 285         else {
 286                 EVS_syslog(LOG_DEBUG,
 287                            "%s resolving next MX Record\n",
 288                            __FUNCTION__);
 289                 return get_one_mx_host_ip(IO);
 290         }
 291 }
 292
 293
 294 void SetConnectStatus(AsyncIO *IO)
 295 {
 296         SmtpOutMsg *Msg = IO->Data;
 297         char buf[256];
 298         void *src;
 299
 300         buf[0] = '\0';
 301
 302         if (IO->ConnectMe->IPv6) {
 303                 src = &IO->ConnectMe->Addr.sin6_addr;
 304         }
 305         else {
 306                 struct sockaddr_in *addr;
 307
 308                 addr = (struct sockaddr_in *)&IO->ConnectMe->Addr;
 309                 src = &addr->sin_addr.s_addr;
 310         }
 311
 312         inet_ntop((IO->ConnectMe->IPv6)?AF_INET6:AF_INET,
 313                   src,
 314                   buf,
 315                   sizeof(buf));
 316
 317         if (Msg->mx_host == NULL)
 318                 Msg->mx_host = "<no MX-Record>";
 319
 320         EVS_syslog(LOG_INFO,
 321                   "connecting to %s [%s]:%d ...\n",
 322                   Msg->mx_host,
 323                   buf,
 324                   Msg->IO.ConnectMe->Port);
 325
 326         Msg->MyQEntry->Status = 4;
 327         StrBufPrintf(Msg->MyQEntry->StatusMessage,
 328                      "Timeout while connecting %s [%s]:%d ",
 329                      Msg->mx_host,
 330                      buf,
 331                      Msg->IO.ConnectMe->Port);
 332         Msg->IO.NextState = eConnect;
 333 }
 334
 335 /*****************************************************************************
 336  * So we connect our Relay IP here.                                          *
 337  *****************************************************************************/
 338 eNextState mx_connect_ip(AsyncIO *IO)
 339 {
 340         SmtpOutMsg *Msg = IO->Data;
 341         SetSMTPState(IO, eSTMPconnecting);
 342
 343         EVS_syslog(LOG_DEBUG, "%s\n", __FUNCTION__);
 344
 345         IO->ConnectMe = Msg->pCurrRelay;
 346         Msg->State = eConnectMX;
 347
 348         SetConnectStatus(IO);
 349
 350         return EvConnectSock(IO,
 351                              SMTP_C_ConnTimeout,
 352                              SMTP_C_ReadTimeouts[0],
 353                              1);
 354 }
 355
 356 eNextState get_one_mx_host_ip_done(AsyncIO *IO)
 357 {
 358         SmtpOutMsg *Msg = IO->Data;
 359         struct hostent *hostent;
 360
 361         IO->ConnectMe = Msg->pCurrRelay;
 362
 363         QueryCbDone(IO);
 364         EVS_syslog(LOG_DEBUG, "%s Time[%fs]\n",
 365                    __FUNCTION__,
 366                    IO->Now - IO->DNS.Start);
 367
 368         hostent = Msg->HostLookup.VParsedDNSReply;
 369         if ((Msg->HostLookup.DNSStatus == ARES_SUCCESS) &&
 370             (hostent != NULL) ) {
 371                 memset(&Msg->pCurrRelay->Addr, 0, sizeof(struct in6_addr));
 372                 if (Msg->pCurrRelay->IPv6) {
 373                         memcpy(&Msg->pCurrRelay->Addr.sin6_addr.s6_addr,
 374                                &hostent->h_addr_list[0],
 375                                sizeof(struct in6_addr));
 376
 377                         Msg->pCurrRelay->Addr.sin6_family =
 378                                 hostent->h_addrtype;
 379                         Msg->pCurrRelay->Addr.sin6_port =
 380                                 htons(Msg->IO.ConnectMe->Port);
 381                 }
 382                 else {
 383                         struct sockaddr_in *addr;
 384                         /*
 385                          * Bypass the ns lookup result like this:
 386                          * IO->Addr.sin_addr.s_addr = inet_addr("127.0.0.1");
 387                          * addr->sin_addr.s_addr =
 388                          *   htonl((uint32_t)&hostent->h_addr_list[0]);
 389                          */
 390
 391                         addr = (struct sockaddr_in*) &Msg->pCurrRelay->Addr;
 392
 393                         memcpy(&addr->sin_addr.s_addr,
 394                                hostent->h_addr_list[0],
 395                                sizeof(uint32_t));
 396
 397                         addr->sin_family = hostent->h_addrtype;
 398                         addr->sin_port   = htons(Msg->IO.ConnectMe->Port);
 399                 }
 400                 Msg->mx_host = Msg->pCurrRelay->Host;
 401                 if (Msg->HostLookup.VParsedDNSReply != NULL) {
 402                         Msg->HostLookup.DNSReplyFree(Msg->HostLookup.VParsedDNSReply);
 403                         Msg->HostLookup.VParsedDNSReply = NULL;
 404                 }
 405                 return mx_connect_ip(IO);
 406         }
 407         else {
 408                 SetSMTPState(IO, eSTMPfailOne);
 409                 if (Msg->HostLookup.VParsedDNSReply != NULL) {
 410                         Msg->HostLookup.DNSReplyFree(Msg->HostLookup.VParsedDNSReply);
 411                         Msg->HostLookup.VParsedDNSReply = NULL;
 412                 }
 413                 return FailOneAttempt(IO);
 414         }
 415 }
 416
 417 eNextState get_one_mx_host_ip(AsyncIO *IO)
 418 {
 419         SmtpOutMsg * Msg = IO->Data;
 420         /*
 421          * here we start with the lookup of one host. it might be...
 422          * - the relay host *sigh*
 423          * - the direct hostname if there was no mx record
 424          * - one of the mx'es
 425          */
 426         SetSMTPState(IO, (Msg->pCurrRelay->IPv6)?eSTMPalookup:eSTMPaaaalookup);
 427
 428         EVS_syslog(LOG_DEBUG, "%s\n", __FUNCTION__);
 429
 430         EVS_syslog(LOG_DEBUG,
 431                   "looking up %s-Record %s : %d ...\n",
 432                   (Msg->pCurrRelay->IPv6)? "aaaa": "a",
 433                   Msg->pCurrRelay->Host,
 434                   Msg->pCurrRelay->Port);
 435
 436         if (!QueueQuery((Msg->pCurrRelay->IPv6)? ns_t_aaaa : ns_t_a,
 437                         Msg->pCurrRelay->Host,
 438                         &Msg->IO,
 439                         &Msg->HostLookup,
 440                         get_one_mx_host_ip_done))
 441         {
 442                 Msg->MyQEntry->Status = 5;
 443                 StrBufPrintf(Msg->MyQEntry->StatusMessage,
 444                              "No MX hosts found for <%s>", Msg->node);
 445                 Msg->IO.NextState = eTerminateConnection;
 446                 return IO->NextState;
 447         }
 448         IO->NextState = eReadDNSReply;
 449         return IO->NextState;
 450 }
 451
 452
 453 /*****************************************************************************
 454  * here we try to find out about the MX records for our recipients.          *
 455  *****************************************************************************/
 456 eNextState smtp_resolve_mx_record_done(AsyncIO *IO)
 457 {
 458         SmtpOutMsg * Msg = IO->Data;
 459         ParsedURL **pp;
 460
 461         QueryCbDone(IO);
 462
 463         EVS_syslog(LOG_DEBUG, "%s Time[%fs]\n",
 464                    __FUNCTION__,
 465                    IO->Now - IO->DNS.Start);
 466
 467         pp = &Msg->Relay;
 468         while ((pp != NULL) && (*pp != NULL) && ((*pp)->Next != NULL))
 469                 pp = &(*pp)->Next;
 470
 471         if ((IO->DNS.Query->DNSStatus == ARES_SUCCESS) &&
 472             (IO->DNS.Query->VParsedDNSReply != NULL))
 473         { /* ok, we found mx records. */
 474
 475                 Msg->CurrMX
 476                         = Msg->AllMX
 477                         = IO->DNS.Query->VParsedDNSReply;
 478                 while (Msg->CurrMX) {
 479                         int i;
 480                         for (i = 0; i < 2; i++) {
 481                                 ParsedURL *p;
 482
 483                                 p = (ParsedURL*) malloc(sizeof(ParsedURL));
 484                                 memset(p, 0, sizeof(ParsedURL));
 485                                 p->Priority = Msg->CurrMX->priority;
 486                                 p->IsIP = 0;
 487                                 p->Port = DefaultMXPort;
 488                                 p->IPv6 = i == 1;
 489                                 p->Host = Msg->CurrMX->host;
 490                                 if (*pp == NULL)
 491                                         *pp = p;
 492                                 else {
 493                                         ParsedURL *ppp = *pp;
 494
 495                                         while ((ppp->Next != NULL) &&
 496                                                (ppp->Next->Priority <= p->Priority))
 497                                                ppp = ppp->Next;
 498                                         if ((ppp == *pp) &&
 499                                             (ppp->Priority > p->Priority)) {
 500                                                 p->Next = *pp;
 501                                                 *pp = p;
 502                                         }
 503                                         else {
 504                                                 p->Next = ppp->Next;
 505                                                 ppp->Next = p;
 506                                         }
 507                                 }
 508                         }
 509                         Msg->CurrMX    = Msg->CurrMX->next;
 510                 }
 511                 Msg->CXFlags   = Msg->CXFlags & F_HAVE_MX;
 512         }
 513         else { /* else fall back to the plain hostname */
 514                 int i;
 515                 for (i = 0; i < 2; i++) {
 516                         ParsedURL *p;
 517
 518                         p = (ParsedURL*) malloc(sizeof(ParsedURL));
 519                         memset(p, 0, sizeof(ParsedURL));
 520                         p->IsIP = 0;
 521                         p->Port = DefaultMXPort;
 522                         p->IPv6 = i == 1;
 523                         p->Host = Msg->node;
 524
 525                         *pp = p;
 526                         pp = &p->Next;
 527                 }
 528                 Msg->CXFlags   = Msg->CXFlags & F_DIRECT;
 529         }
 530         if (Msg->MyQItem->FallBackHost != NULL)
 531         {
 532                 Msg->MyQItem->FallBackHost->Next = *pp;
 533                 *pp = Msg->MyQItem->FallBackHost;
 534         }
 535         Msg->pCurrRelay = Msg->Relay;
 536         return get_one_mx_host_ip(IO);
 537 }
 538
 539 eNextState resolve_mx_records(AsyncIO *IO)
 540 {
 541         SmtpOutMsg * Msg = IO->Data;
 542
 543         SetSMTPState(IO, eSTMPmxlookup);
 544
 545         EVS_syslog(LOG_DEBUG, "%s\n", __FUNCTION__);
 546         /* start resolving MX records here. */
 547         if (!QueueQuery(ns_t_mx,
 548                         Msg->node,
 549                         &Msg->IO,
 550                         &Msg->MxLookup,
 551                         smtp_resolve_mx_record_done))
 552         {
 553                 Msg->MyQEntry->Status = 5;
 554                 StrBufPrintf(Msg->MyQEntry->StatusMessage,
 555                              "No MX hosts found for <%s>", Msg->node);
 556                 return IO->NextState;
 557         }
 558         Msg->IO.NextState = eReadDNSReply;
 559         return IO->NextState;
 560 }
 561
 562
 563
 564 /******************************************************************************
 565  *  so, we're going to start a SMTP delivery.  lets get it on.                *
 566  ******************************************************************************/
 567
 568 SmtpOutMsg *new_smtp_outmsg(OneQueItem *MyQItem,
 569                             MailQEntry *MyQEntry,
 570                             int MsgCount)
 571 {
 572         SmtpOutMsg * Msg;
 573
 574         Msg = (SmtpOutMsg *) malloc(sizeof(SmtpOutMsg));
 575         if (Msg == NULL)
 576                 return NULL;
 577         memset(Msg, 0, sizeof(SmtpOutMsg));
 578
 579         Msg->n                = MsgCount;
 580         Msg->MyQEntry         = MyQEntry;
 581         Msg->MyQItem          = MyQItem;
 582         Msg->pCurrRelay       = MyQItem->URL;
 583
 584         InitIOStruct(&Msg->IO,
 585                      Msg,
 586                      eReadMessage,
 587                      SMTP_C_ReadServerStatus,
 588                      SMTP_C_DNSFail,
 589                      SMTP_C_DispatchWriteDone,
 590                      SMTP_C_DispatchReadDone,
 591                      SMTP_C_Terminate,
 592                      SMTP_C_TerminateDB,
 593                      SMTP_C_ConnFail,
 594                      SMTP_C_Timeout,
 595                      SMTP_C_Shutdown);
 596
 597         Msg->IO.ErrMsg = Msg->MyQEntry->StatusMessage;
 598
 599         return Msg;
 600 }
 601
 602 void smtp_try_one_queue_entry(OneQueItem *MyQItem,
 603                               MailQEntry *MyQEntry,
 604                               StrBuf *MsgText,
 605                         /*KeepMsgText allows us to use MsgText as ours.*/
 606                               int KeepMsgText,
 607                               int MsgCount)
 608 {
 609         SmtpOutMsg *Msg;
 610
 611         SMTPC_syslog(LOG_DEBUG, "%s\n", __FUNCTION__);
 612
 613         Msg = new_smtp_outmsg(MyQItem, MyQEntry, MsgCount);
 614         if (Msg == NULL) {
 615                 SMTPC_syslog(LOG_DEBUG, "%s Failed to alocate message context.\n", __FUNCTION__);
 616                 if (KeepMsgText)
 617                         FreeStrBuf (&MsgText);
 618                 return;
 619         }
 620         if (KeepMsgText) Msg->msgtext = MsgText;
 621         else             Msg->msgtext = NewStrBufDup(MsgText);
 622
 623         if (smtp_resolve_recipients(Msg) &&
 624             (!MyQItem->HaveRelay ||
 625              (MyQItem->URL != NULL)))
 626         {
 627                 safestrncpy(
 628                         ((CitContext *)Msg->IO.CitContext)->cs_host,
 629                         Msg->node,
 630                         sizeof(((CitContext *)
 631                                 Msg->IO.CitContext)->cs_host));
 632
 633                 SMTPC_syslog(LOG_DEBUG, "Starting: [%ld] <%s> CC <%d> \n",
 634                              Msg->MyQItem->MessageID,
 635                              ChrPtr(Msg->MyQEntry->Recipient),
 636                              ((CitContext*)Msg->IO.CitContext)->cs_pid);
 637                 if (Msg->pCurrRelay == NULL) {
 638                         SetSMTPState(&Msg->IO, eSTMPmxlookup);
 639                         QueueEventContext(&Msg->IO,
 640                                           resolve_mx_records);
 641                 }
 642                 else { /* oh... via relay host */
 643                         if (Msg->pCurrRelay->IsIP) {
 644                                 SetSMTPState(&Msg->IO, eSTMPconnecting);
 645                                 QueueEventContext(&Msg->IO,
 646                                                   mx_connect_ip);
 647                         }
 648                         else {
 649                                 SetSMTPState(&Msg->IO, eSTMPalookup);
 650                                 /* uneducated admin has chosen to
 651                                    add DNS to the equation... */
 652                                 QueueEventContext(&Msg->IO,
 653                                                   get_one_mx_host_ip);
 654                         }
 655                 }
 656         }
 657         else {
 658                 SetSMTPState(&Msg->IO, eSMTPFailTotal);
 659                 /* No recipients? well fail then. */
 660                 if (Msg->MyQEntry != NULL) {
 661                         Msg->MyQEntry->Status = 5;
 662                         if (StrLength(Msg->MyQEntry->StatusMessage) == 0)
 663                                 StrBufPlain(Msg->MyQEntry->StatusMessage,
 664                                             HKEY("Invalid Recipient!"));
 665                 }
 666                 FinalizeMessageSend_DB(&Msg->IO);
 667                 DeleteSmtpOutMsg(Msg);
 668         }
 669 }
 670
 671
 672
 673
 674
 675
 676 /*****************************************************************************/
 677 /*                     SMTP CLIENT DISPATCHER                                */
 678 /*****************************************************************************/
 679
 680 void SMTPSetTimeout(eNextState NextTCPState, SmtpOutMsg *Msg)
 681 {
 682         double Timeout = 0.0;
 683         AsyncIO *IO = &Msg->IO;
 684
 685         EVS_syslog(LOG_DEBUG, "%s\n", __FUNCTION__);
 686
 687         switch (NextTCPState) {
 688         case eSendFile:
 689         case eSendReply:
 690         case eSendMore:
 691                 Timeout = SMTP_C_SendTimeouts[Msg->State];
 692                 if (Msg->State == eDATABody) {
 693                         /* if we're sending a huge message,
 694                          * we need more time.
 695                          */
 696                         Timeout += StrLength(Msg->msgtext) / 512;
 697                 }
 698                 break;
 699         case eReadMessage:
 700                 Timeout = SMTP_C_ReadTimeouts[Msg->State];
 701                 if (Msg->State == eDATATerminateBody) {
 702                         /*
 703                          * some mailservers take a nap before accepting
 704                          * the message content inspection and such.
 705                          */
 706                         Timeout += StrLength(Msg->msgtext) / 512;
 707                 }
 708                 break;
 709         case eSendDNSQuery:
 710         case eReadDNSReply:
 711         case eDBQuery:
 712         case eReadFile:
 713         case eReadMore:
 714         case eReadPayload:
 715         case eConnect:
 716         case eTerminateConnection:
 717         case eAbort:
 718                 return;
 719         }
 720         SetNextTimeout(&Msg->IO, Timeout);
 721 }
 722 eNextState SMTP_C_DispatchReadDone(AsyncIO *IO)
 723 {
 724         EVS_syslog(LOG_DEBUG, "%s\n", __FUNCTION__);
 725         SmtpOutMsg *Msg = IO->Data;
 726         eNextState rc;
 727
 728         rc = ReadHandlers[Msg->State](Msg);
 729         if (rc != eAbort)
 730         {
 731                 Msg->State++;
 732                 SMTPSetTimeout(rc, Msg);
 733         }
 734         return rc;
 735 }
 736 eNextState SMTP_C_DispatchWriteDone(AsyncIO *IO)
 737 {
 738         EVS_syslog(LOG_DEBUG, "%s\n", __FUNCTION__);
 739         SmtpOutMsg *Msg = IO->Data;
 740         eNextState rc;
 741
 742         rc = SendHandlers[Msg->State](Msg);
 743         SMTPSetTimeout(rc, Msg);
 744         return rc;
 745 }
 746
 747
 748 /*****************************************************************************/
 749 /*                     SMTP CLIENT ERROR CATCHERS                            */
 750 /*****************************************************************************/
 751 eNextState SMTP_C_Terminate(AsyncIO *IO)
 752 {
 753         SmtpOutMsg *Msg = IO->Data;
 754
 755         EVS_syslog(LOG_DEBUG, "%s\n", __FUNCTION__);
 756         return FinalizeMessageSend(Msg);
 757 }
 758 eNextState SMTP_C_TerminateDB(AsyncIO *IO)
 759 {
 760         EVS_syslog(LOG_DEBUG, "%s\n", __FUNCTION__);
 761         return Terminate(IO);
 762 }
 763 eNextState SMTP_C_Timeout(AsyncIO *IO)
 764 {
 765         SmtpOutMsg *Msg = IO->Data;
 766
 767         Msg->MyQEntry->Status = 4;
 768         EVS_syslog(LOG_DEBUG, "%s\n", __FUNCTION__);
 769         StrBufPlain(IO->ErrMsg, CKEY(ReadErrors[Msg->State]));
 770         if (Msg->State > eRCPT)
 771                 return eAbort;
 772         else
 773                 return FailOneAttempt(IO);
 774 }
 775 eNextState SMTP_C_ConnFail(AsyncIO *IO)
 776 {
 777         SmtpOutMsg *Msg = IO->Data;
 778
 779         Msg->MyQEntry->Status = 4;
 780         EVS_syslog(LOG_DEBUG, "%s\n", __FUNCTION__);
 781         StrBufPlain(IO->ErrMsg, CKEY(ReadErrors[Msg->State]));
 782         return FailOneAttempt(IO);
 783 }
 784 eNextState SMTP_C_DNSFail(AsyncIO *IO)
 785 {
 786         SmtpOutMsg *Msg = IO->Data;
 787         Msg->MyQEntry->Status = 4;
 788         EVS_syslog(LOG_DEBUG, "%s\n", __FUNCTION__);
 789         return FailOneAttempt(IO);
 790 }
 791 eNextState SMTP_C_Shutdown(AsyncIO *IO)
 792 {
 793         EVS_syslog(LOG_DEBUG, "%s\n", __FUNCTION__);
 794         SmtpOutMsg *Msg = IO->Data;
 795
 796         switch (IO->NextState) {
 797         case eSendDNSQuery:
 798         case eReadDNSReply:
 799
 800                 /* todo: abort c-ares */
 801         case eConnect:
 802         case eSendReply:
 803         case eSendMore:
 804         case eSendFile:
 805         case eReadMessage:
 806         case eReadMore:
 807         case eReadPayload:
 808         case eReadFile:
 809                 StopClientWatchers(IO, 1);
 810                 break;
 811         case eDBQuery:
 812
 813                 break;
 814         case eTerminateConnection:
 815         case eAbort:
 816                 break;
 817         }
 818         Msg->MyQEntry->Status = 3;
 819         StrBufPlain(Msg->MyQEntry->StatusMessage,
 820                     HKEY("server shutdown during message submit."));
 821         return FinalizeMessageSend(Msg);
 822 }
 823
 824
 825 /**
 826  * @brief lineread Handler;
 827  * understands when to read more SMTP lines, and when this is a one-lined reply.
 828  */
 829 eReadState SMTP_C_ReadServerStatus(AsyncIO *IO)
 830 {
 831         eReadState Finished = eBufferNotEmpty;
 832
 833         while (Finished == eBufferNotEmpty) {
 834                 Finished = StrBufChunkSipLine(IO->IOBuf, &IO->RecvBuf);
 835
 836                 switch (Finished) {
 837                 case eMustReadMore: /// read new from socket...
 838                         return Finished;
 839                         break;
 840                 case eBufferNotEmpty: /* shouldn't happen... */
 841                 case eReadSuccess: /// done for now...
 842                         if (StrLength(IO->IOBuf) < 4)
 843                                 continue;
 844                         if (ChrPtr(IO->IOBuf)[3] == '-')
 845                                 Finished = eBufferNotEmpty;
 846                         else
 847                                 return Finished;
 848                         break;
 849                 case eReadFail: /// WHUT?
 850                         ///todo: shut down!
 851                         break;
 852                 }
 853         }
 854         return Finished;
 855 }
 856
 857 void LogDebugEnableSMTPClient(const int n)
 858 {
 859         SMTPClientDebugEnabled = n;
 860 }
 861
 862 CTDL_MODULE_INIT(smtp_eventclient)
 863 {
 864         if (!threading)
 865                 CtdlRegisterDebugFlagHook(HKEY("smtpeventclient"), LogDebugEnableSMTPClient, &SMTPClientDebugEnabled);
 866         return "smtpeventclient";
 867 }