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         if (CCC != NULL)
 112                 memcpy(CCC->cs_clientname, SMTPStates[State].Key, SMTPStates[State].len + 1);
 113 }
 114
 115 int SMTPClientDebugEnabled = 0;
 116 void DeleteSmtpOutMsg(void *v)
 117 {
 118         SmtpOutMsg *Msg = v;
 119         AsyncIO *IO = &Msg->IO;
 120         EV_syslog(LOG_DEBUG, "%s Exit\n", __FUNCTION__);
 121
 122         /* these are kept in our own space and free'd below */
 123         Msg->IO.ConnectMe = NULL;
 124
 125         ares_free_data(Msg->AllMX);
 126         if (Msg->HostLookup.VParsedDNSReply != NULL)
 127                 Msg->HostLookup.DNSReplyFree(Msg->HostLookup.VParsedDNSReply);
 128         FreeURL(&Msg->Relay);
 129         FreeStrBuf(&Msg->msgtext);
 130         FreeAsyncIOContents(&Msg->IO);
 131         memset (Msg, 0, sizeof(SmtpOutMsg)); /* just to be shure... */
 132         free(Msg);
 133 }
 134
 135 eNextState SMTP_C_Shutdown(AsyncIO *IO);
 136 eNextState SMTP_C_Timeout(AsyncIO *IO);
 137 eNextState SMTP_C_ConnFail(AsyncIO *IO);
 138 eNextState SMTP_C_DispatchReadDone(AsyncIO *IO);
 139 eNextState SMTP_C_DispatchWriteDone(AsyncIO *IO);
 140 eNextState SMTP_C_DNSFail(AsyncIO *IO);
 141 eNextState SMTP_C_Terminate(AsyncIO *IO);
 142 eNextState SMTP_C_TerminateDB(AsyncIO *IO);
 143 eReadState SMTP_C_ReadServerStatus(AsyncIO *IO);
 144
 145 eNextState mx_connect_ip(AsyncIO *IO);
 146 eNextState get_one_mx_host_ip(AsyncIO *IO);
 147
 148 /******************************************************************************
 149  * So, we're finished with sending (regardless of success or failure)         *
 150  * This Message might be referenced by several Queue-Items, if we're the last,*
 151  * we need to free the memory and send bounce messages (on terminal failure)  *
 152  * else we just free our SMTP-Message struct.                                 *
 153  ******************************************************************************/
 154 eNextState FinalizeMessageSend_DB(AsyncIO *IO)
 155 {
 156         const char *Status;
 157         SmtpOutMsg *Msg = IO->Data;
 158         StrBuf *StatusMessage;
 159
 160         if (Msg->MyQEntry->AllStatusMessages != NULL)
 161                 StatusMessage = Msg->MyQEntry->AllStatusMessages;
 162         else
 163                 StatusMessage = Msg->MyQEntry->StatusMessage;
 164
 165
 166         if (Msg->MyQEntry->Status == 2) {
 167                 SetSMTPState(IO, eSTMPfinished);
 168                 Status = "Delivery successful.";
 169         }
 170         else if (Msg->MyQEntry->Status == 5) {
 171                 SetSMTPState(IO, eSMTPFailTotal);
 172                 Status = "Delivery failed permanently; giving up.";
 173         }
 174         else {
 175                 SetSMTPState(IO, eSMTPFailTemporary);
 176                 Status = "Delivery failed temporarily; will retry later.";
 177         }
 178
 179         EVS_syslog(LOG_INFO,
 180                    "%s Time[%fs] Recipient <%s> @ <%s> (%s) Status message: %s\n",
 181                    Status,
 182                    Msg->IO.Now - Msg->IO.StartIO,
 183                    Msg->user,
 184                    Msg->node,
 185                    Msg->name,
 186                    ChrPtr(StatusMessage));
 187
 188
 189         Msg->IDestructQueItem = DecreaseQReference(Msg->MyQItem);
 190
 191         Msg->nRemain = CountActiveQueueEntries(Msg->MyQItem, 0);
 192
 193         if (Msg->MyQEntry->Active &&
 194             !Msg->MyQEntry->StillActive &&
 195             CheckQEntryIsBounce(Msg->MyQEntry))
 196         {
 197                 /* are we casue for a bounce mail? */
 198                 Msg->MyQItem->SendBounceMail |= (1<<Msg->MyQEntry->Status);
 199         }
 200
 201         if ((Msg->nRemain > 0) || Msg->IDestructQueItem)
 202                 Msg->QMsgData = SerializeQueueItem(Msg->MyQItem);
 203         else
 204                 Msg->QMsgData = NULL;
 205
 206         /*
 207          * Uncompleted delivery instructions remain, so delete the old
 208          * instructions and replace with the updated ones.
 209          */
 210         EVS_syslog(LOG_DEBUG, "%ld", Msg->MyQItem->QueMsgID);
 211         CtdlDeleteMessages(SMTP_SPOOLOUT_ROOM, &Msg->MyQItem->QueMsgID, 1, "");
 212         Msg->MyQItem->QueMsgID = -1;
 213
 214         if (Msg->IDestructQueItem)
 215                 smtpq_do_bounce(Msg->MyQItem, StatusMessage, Msg->msgtext, Msg->pCurrRelay);
 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, "%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
 240         RemoveContext(Msg->IO.CitContext);
 241         return eAbort;
 242 }
 243
 244 eNextState Terminate(AsyncIO *IO)
 245 {
 246         SmtpOutMsg *Msg = IO->Data;
 247
 248         if (Msg->IDestructQueItem)
 249                 RemoveQItem(Msg->MyQItem);
 250
 251         DeleteSmtpOutMsg(Msg);
 252         return eAbort;
 253 }
 254 eNextState FinalizeMessageSend(SmtpOutMsg *Msg)
 255 {
 256         /* hand over to DB Queue */
 257         return QueueDBOperation(&Msg->IO, FinalizeMessageSend_DB);
 258 }
 259
 260 eNextState FailOneAttempt(AsyncIO *IO)
 261 {
 262         SmtpOutMsg *Msg = IO->Data;
 263
 264         SetSMTPState(IO, eSTMPfailOne);
 265         if (Msg->MyQEntry->Status == 2)
 266                 return eAbort;
 267
 268         /*
 269          * possible ways here:
 270          * - connection timeout
 271          * - dns lookup failed
 272          */
 273         StopClientWatchers(IO, 1);
 274
 275         Msg->MyQEntry->nAttempt ++;
 276         if (Msg->MyQEntry->AllStatusMessages == NULL)
 277                 Msg->MyQEntry->AllStatusMessages = NewStrBuf();
 278
 279         StrBufAppendPrintf(Msg->MyQEntry->AllStatusMessages, "%ld) ", Msg->MyQEntry->nAttempt);
 280         StrBufAppendBuf(Msg->MyQEntry->AllStatusMessages, Msg->MyQEntry->StatusMessage, 0);
 281         StrBufAppendBufPlain(Msg->MyQEntry->AllStatusMessages, HKEY("; "), 0);
 282
 283         if (Msg->pCurrRelay != NULL)
 284                 Msg->pCurrRelay = Msg->pCurrRelay->Next;
 285         if ((Msg->pCurrRelay != NULL) &&
 286             !Msg->pCurrRelay->IsRelay &&
 287             Msg->MyQItem->HaveRelay)
 288         {
 289                 EVS_syslog(LOG_DEBUG, "%s Aborting; last relay failed.\n", __FUNCTION__);
 290                 return eAbort;
 291         }
 292
 293         if (Msg->pCurrRelay == NULL) {
 294                 EVS_syslog(LOG_DEBUG, "%s Aborting\n", __FUNCTION__);
 295                 return eAbort;
 296         }
 297         if (Msg->pCurrRelay->IsIP) {
 298                 EVS_syslog(LOG_DEBUG, "%s connecting IP\n", __FUNCTION__);
 299                 return mx_connect_ip(IO);
 300         }
 301         else {
 302                 EVS_syslog(LOG_DEBUG,
 303                            "%s resolving next MX Record\n",
 304                            __FUNCTION__);
 305                 return get_one_mx_host_ip(IO);
 306         }
 307 }
 308
 309
 310 void SetConnectStatus(AsyncIO *IO)
 311 {
 312         SmtpOutMsg *Msg = IO->Data;
 313         char buf[256];
 314         void *src;
 315
 316         buf[0] = '\0';
 317
 318         if (IO->ConnectMe->IPv6) {
 319                 src = &IO->ConnectMe->Addr.sin6_addr;
 320         }
 321         else {
 322                 struct sockaddr_in *addr;
 323
 324                 addr = (struct sockaddr_in *)&IO->ConnectMe->Addr;
 325                 src = &addr->sin_addr.s_addr;
 326         }
 327
 328         inet_ntop((IO->ConnectMe->IPv6)?AF_INET6:AF_INET,
 329                   src,
 330                   buf,
 331                   sizeof(buf));
 332
 333         if (Msg->mx_host == NULL)
 334                 Msg->mx_host = "<no MX-Record>";
 335
 336         EVS_syslog(LOG_INFO,
 337                   "connecting to %s [%s]:%d ...\n",
 338                   Msg->mx_host,
 339                   buf,
 340                   Msg->IO.ConnectMe->Port);
 341
 342         Msg->MyQEntry->Status = 4;
 343         StrBufPrintf(Msg->MyQEntry->StatusMessage,
 344                      "Timeout while connecting %s [%s]:%d ",
 345                      Msg->mx_host,
 346                      buf,
 347                      Msg->IO.ConnectMe->Port);
 348         Msg->IO.NextState = eConnect;
 349 }
 350
 351 /*****************************************************************************
 352  * So we connect our Relay IP here.                                          *
 353  *****************************************************************************/
 354 eNextState mx_connect_ip(AsyncIO *IO)
 355 {
 356         SmtpOutMsg *Msg = IO->Data;
 357         SetSMTPState(IO, eSTMPconnecting);
 358
 359         EVS_syslog(LOG_DEBUG, "%s\n", __FUNCTION__);
 360
 361         IO->ConnectMe = Msg->pCurrRelay;
 362         Msg->State = eConnectMX;
 363
 364         SetConnectStatus(IO);
 365
 366         return EvConnectSock(IO,
 367                              SMTP_C_ConnTimeout,
 368                              SMTP_C_ReadTimeouts[0],
 369                              1);
 370 }
 371
 372 eNextState get_one_mx_host_ip_done(AsyncIO *IO)
 373 {
 374         SmtpOutMsg *Msg = IO->Data;
 375         struct hostent *hostent;
 376
 377         IO->ConnectMe = Msg->pCurrRelay;
 378
 379         QueryCbDone(IO);
 380         EVS_syslog(LOG_DEBUG, "%s Time[%fs]\n",
 381                    __FUNCTION__,
 382                    IO->Now - IO->DNS.Start);
 383
 384         hostent = Msg->HostLookup.VParsedDNSReply;
 385         if ((Msg->HostLookup.DNSStatus == ARES_SUCCESS) &&
 386             (hostent != NULL) ) {
 387                 memset(&Msg->pCurrRelay->Addr, 0, sizeof(struct in6_addr));
 388                 if (Msg->pCurrRelay->IPv6) {
 389                         memcpy(&Msg->pCurrRelay->Addr.sin6_addr.s6_addr,
 390                                &hostent->h_addr_list[0],
 391                                sizeof(struct in6_addr));
 392
 393                         Msg->pCurrRelay->Addr.sin6_family =
 394                                 hostent->h_addrtype;
 395                         Msg->pCurrRelay->Addr.sin6_port =
 396                                 htons(Msg->IO.ConnectMe->Port);
 397                 }
 398                 else {
 399                         struct sockaddr_in *addr;
 400                         /*
 401                          * Bypass the ns lookup result like this:
 402                          * IO->Addr.sin_addr.s_addr = inet_addr("127.0.0.1");
 403                          * addr->sin_addr.s_addr =
 404                          *   htonl((uint32_t)&hostent->h_addr_list[0]);
 405                          */
 406
 407                         addr = (struct sockaddr_in*) &Msg->pCurrRelay->Addr;
 408
 409                         memcpy(&addr->sin_addr.s_addr,
 410                                hostent->h_addr_list[0],
 411                                sizeof(uint32_t));
 412
 413                         addr->sin_family = hostent->h_addrtype;
 414                         addr->sin_port   = htons(Msg->IO.ConnectMe->Port);
 415                 }
 416                 Msg->mx_host = Msg->pCurrRelay->Host;
 417                 if (Msg->HostLookup.VParsedDNSReply != NULL) {
 418                         Msg->HostLookup.DNSReplyFree(Msg->HostLookup.VParsedDNSReply);
 419                         Msg->HostLookup.VParsedDNSReply = NULL;
 420                 }
 421                 return mx_connect_ip(IO);
 422         }
 423         else {
 424                 SetSMTPState(IO, eSTMPfailOne);
 425                 if (Msg->HostLookup.VParsedDNSReply != NULL) {
 426                         Msg->HostLookup.DNSReplyFree(Msg->HostLookup.VParsedDNSReply);
 427                         Msg->HostLookup.VParsedDNSReply = NULL;
 428                 }
 429                 return FailOneAttempt(IO);
 430         }
 431 }
 432
 433 eNextState get_one_mx_host_ip(AsyncIO *IO)
 434 {
 435         SmtpOutMsg * Msg = IO->Data;
 436         /*
 437          * here we start with the lookup of one host. it might be...
 438          * - the relay host *sigh*
 439          * - the direct hostname if there was no mx record
 440          * - one of the mx'es
 441          */
 442         SetSMTPState(IO, (Msg->pCurrRelay->IPv6)?eSTMPalookup:eSTMPaaaalookup);
 443
 444         EVS_syslog(LOG_DEBUG, "%s\n", __FUNCTION__);
 445
 446         EVS_syslog(LOG_DEBUG,
 447                   "looking up %s-Record %s : %d ...\n",
 448                   (Msg->pCurrRelay->IPv6)? "aaaa": "a",
 449                   Msg->pCurrRelay->Host,
 450                   Msg->pCurrRelay->Port);
 451
 452         if (!QueueQuery((Msg->pCurrRelay->IPv6)? ns_t_aaaa : ns_t_a,
 453                         Msg->pCurrRelay->Host,
 454                         &Msg->IO,
 455                         &Msg->HostLookup,
 456                         get_one_mx_host_ip_done))
 457         {
 458                 Msg->MyQEntry->Status = 5;
 459                 StrBufPrintf(Msg->MyQEntry->StatusMessage,
 460                              "No MX hosts found for <%s>", Msg->node);
 461                 Msg->IO.NextState = eTerminateConnection;
 462                 return IO->NextState;
 463         }
 464         IO->NextState = eReadDNSReply;
 465         return IO->NextState;
 466 }
 467
 468
 469 /*****************************************************************************
 470  * here we try to find out about the MX records for our recipients.          *
 471  *****************************************************************************/
 472 eNextState smtp_resolve_mx_record_done(AsyncIO *IO)
 473 {
 474         SmtpOutMsg * Msg = IO->Data;
 475         ParsedURL **pp;
 476
 477         QueryCbDone(IO);
 478
 479         EVS_syslog(LOG_DEBUG, "%s Time[%fs]\n",
 480                    __FUNCTION__,
 481                    IO->Now - IO->DNS.Start);
 482
 483         pp = &Msg->Relay;
 484         while ((pp != NULL) && (*pp != NULL) && ((*pp)->Next != NULL))
 485                 pp = &(*pp)->Next;
 486
 487         if ((IO->DNS.Query->DNSStatus == ARES_SUCCESS) &&
 488             (IO->DNS.Query->VParsedDNSReply != NULL))
 489         { /* ok, we found mx records. */
 490
 491                 Msg->CurrMX
 492                         = Msg->AllMX
 493                         = IO->DNS.Query->VParsedDNSReply;
 494                 while (Msg->CurrMX) {
 495                         int i;
 496                         for (i = 0; i < 2; i++) {
 497                                 ParsedURL *p;
 498
 499                                 p = (ParsedURL*) malloc(sizeof(ParsedURL));
 500                                 memset(p, 0, sizeof(ParsedURL));
 501                                 p->Priority = Msg->CurrMX->priority;
 502                                 p->IsIP = 0;
 503                                 p->Port = DefaultMXPort;
 504                                 p->IPv6 = i == 1;
 505                                 p->Host = Msg->CurrMX->host;
 506                                 if (*pp == NULL)
 507                                         *pp = p;
 508                                 else {
 509                                         ParsedURL *ppp = *pp;
 510
 511                                         while ((ppp->Next != NULL) &&
 512                                                (ppp->Next->Priority <= p->Priority))
 513                                                ppp = ppp->Next;
 514                                         if ((ppp == *pp) &&
 515                                             (ppp->Priority > p->Priority)) {
 516                                                 p->Next = *pp;
 517                                                 *pp = p;
 518                                         }
 519                                         else {
 520                                                 p->Next = ppp->Next;
 521                                                 ppp->Next = p;
 522                                         }
 523                                 }
 524                         }
 525                         Msg->CurrMX    = Msg->CurrMX->next;
 526                 }
 527                 Msg->CXFlags   = Msg->CXFlags & F_HAVE_MX;
 528         }
 529         else { /* else fall back to the plain hostname */
 530                 int i;
 531                 for (i = 0; i < 2; i++) {
 532                         ParsedURL *p;
 533
 534                         p = (ParsedURL*) malloc(sizeof(ParsedURL));
 535                         memset(p, 0, sizeof(ParsedURL));
 536                         p->IsIP = 0;
 537                         p->Port = DefaultMXPort;
 538                         p->IPv6 = i == 1;
 539                         p->Host = Msg->node;
 540
 541                         *pp = p;
 542                         pp = &p->Next;
 543                 }
 544                 Msg->CXFlags   = Msg->CXFlags & F_DIRECT;
 545         }
 546         if (Msg->MyQItem->FallBackHost != NULL)
 547         {
 548                 Msg->MyQItem->FallBackHost->Next = *pp;
 549                 *pp = Msg->MyQItem->FallBackHost;
 550         }
 551         Msg->pCurrRelay = Msg->Relay;
 552         return get_one_mx_host_ip(IO);
 553 }
 554
 555 eNextState resolve_mx_records(AsyncIO *IO)
 556 {
 557         SmtpOutMsg * Msg = IO->Data;
 558
 559         SetSMTPState(IO, eSTMPmxlookup);
 560
 561         EVS_syslog(LOG_DEBUG, "%s\n", __FUNCTION__);
 562         /* start resolving MX records here. */
 563         if (!QueueQuery(ns_t_mx,
 564                         Msg->node,
 565                         &Msg->IO,
 566                         &Msg->MxLookup,
 567                         smtp_resolve_mx_record_done))
 568         {
 569                 Msg->MyQEntry->Status = 5;
 570                 StrBufPrintf(Msg->MyQEntry->StatusMessage,
 571                              "No MX hosts found for <%s>", Msg->node);
 572                 return IO->NextState;
 573         }
 574         Msg->IO.NextState = eReadDNSReply;
 575         return IO->NextState;
 576 }
 577
 578
 579
 580 /******************************************************************************
 581  *  so, we're going to start a SMTP delivery.  lets get it on.                *
 582  ******************************************************************************/
 583
 584 SmtpOutMsg *new_smtp_outmsg(OneQueItem *MyQItem,
 585                             MailQEntry *MyQEntry,
 586                             int MsgCount)
 587 {
 588         SmtpOutMsg * Msg;
 589
 590         Msg = (SmtpOutMsg *) malloc(sizeof(SmtpOutMsg));
 591         if (Msg == NULL)
 592                 return NULL;
 593         memset(Msg, 0, sizeof(SmtpOutMsg));
 594
 595         Msg->n                = MsgCount;
 596         Msg->MyQEntry         = MyQEntry;
 597         Msg->MyQItem          = MyQItem;
 598         Msg->pCurrRelay       = MyQItem->URL;
 599
 600         InitIOStruct(&Msg->IO,
 601                      Msg,
 602                      eReadMessage,
 603                      SMTP_C_ReadServerStatus,
 604                      SMTP_C_DNSFail,
 605                      SMTP_C_DispatchWriteDone,
 606                      SMTP_C_DispatchReadDone,
 607                      SMTP_C_Terminate,
 608                      SMTP_C_TerminateDB,
 609                      SMTP_C_ConnFail,
 610                      SMTP_C_Timeout,
 611                      SMTP_C_Shutdown);
 612
 613         Msg->IO.ErrMsg = Msg->MyQEntry->StatusMessage;
 614
 615         return Msg;
 616 }
 617
 618 void smtp_try_one_queue_entry(OneQueItem *MyQItem,
 619                               MailQEntry *MyQEntry,
 620                               StrBuf *MsgText,
 621                         /*KeepMsgText allows us to use MsgText as ours.*/
 622                               int KeepMsgText,
 623                               int MsgCount)
 624 {
 625         SmtpOutMsg *Msg;
 626
 627         SMTPC_syslog(LOG_DEBUG, "%s\n", __FUNCTION__);
 628
 629         Msg = new_smtp_outmsg(MyQItem, MyQEntry, MsgCount);
 630         if (Msg == NULL) {
 631                 SMTPC_syslog(LOG_DEBUG, "%s Failed to alocate message context.\n", __FUNCTION__);
 632                 if (KeepMsgText)
 633                         FreeStrBuf (&MsgText);
 634                 return;
 635         }
 636         if (KeepMsgText) Msg->msgtext = MsgText;
 637         else             Msg->msgtext = NewStrBufDup(MsgText);
 638
 639         if (smtp_resolve_recipients(Msg) &&
 640             (!MyQItem->HaveRelay ||
 641              (MyQItem->URL != NULL)))
 642         {
 643                 safestrncpy(
 644                         ((CitContext *)Msg->IO.CitContext)->cs_host,
 645                         Msg->node,
 646                         sizeof(((CitContext *)
 647                                 Msg->IO.CitContext)->cs_host));
 648
 649                 SMTPC_syslog(LOG_DEBUG, "Starting: [%ld] <%s> CC <%d> \n",
 650                              Msg->MyQItem->MessageID,
 651                              ChrPtr(Msg->MyQEntry->Recipient),
 652                              ((CitContext*)Msg->IO.CitContext)->cs_pid);
 653                 if (Msg->pCurrRelay == NULL) {
 654                         SetSMTPState(&Msg->IO, eSTMPmxlookup);
 655                         QueueEventContext(&Msg->IO,
 656                                           resolve_mx_records);
 657                 }
 658                 else { /* oh... via relay host */
 659                         if (Msg->pCurrRelay->IsIP) {
 660                                 SetSMTPState(&Msg->IO, eSTMPconnecting);
 661                                 QueueEventContext(&Msg->IO,
 662                                                   mx_connect_ip);
 663                         }
 664                         else {
 665                                 SetSMTPState(&Msg->IO, eSTMPalookup);
 666                                 /* uneducated admin has chosen to
 667                                    add DNS to the equation... */
 668                                 QueueEventContext(&Msg->IO,
 669                                                   get_one_mx_host_ip);
 670                         }
 671                 }
 672         }
 673         else {
 674                 SetSMTPState(&Msg->IO, eSMTPFailTotal);
 675                 /* No recipients? well fail then. */
 676                 if (Msg->MyQEntry != NULL) {
 677                         Msg->MyQEntry->Status = 5;
 678                         if (StrLength(Msg->MyQEntry->StatusMessage) == 0)
 679                                 StrBufPlain(Msg->MyQEntry->StatusMessage,
 680                                             HKEY("Invalid Recipient!"));
 681                 }
 682                 FinalizeMessageSend_DB(&Msg->IO);
 683                 DeleteSmtpOutMsg(Msg);
 684         }
 685 }
 686
 687
 688
 689
 690
 691
 692 /*****************************************************************************/
 693 /*                     SMTP CLIENT DISPATCHER                                */
 694 /*****************************************************************************/
 695
 696 void SMTPSetTimeout(eNextState NextTCPState, SmtpOutMsg *Msg)
 697 {
 698         double Timeout = 0.0;
 699         AsyncIO *IO = &Msg->IO;
 700
 701         EVS_syslog(LOG_DEBUG, "%s\n", __FUNCTION__);
 702
 703         switch (NextTCPState) {
 704         case eSendFile:
 705         case eSendReply:
 706         case eSendMore:
 707                 Timeout = SMTP_C_SendTimeouts[Msg->State];
 708                 if (Msg->State == eDATABody) {
 709                         /* if we're sending a huge message,
 710                          * we need more time.
 711                          */
 712                         Timeout += StrLength(Msg->msgtext) / 512;
 713                 }
 714                 break;
 715         case eReadMessage:
 716                 Timeout = SMTP_C_ReadTimeouts[Msg->State];
 717                 if (Msg->State == eDATATerminateBody) {
 718                         /*
 719                          * some mailservers take a nap before accepting
 720                          * the message content inspection and such.
 721                          */
 722                         Timeout += StrLength(Msg->msgtext) / 512;
 723                 }
 724                 break;
 725         case eSendDNSQuery:
 726         case eReadDNSReply:
 727         case eDBQuery:
 728         case eReadFile:
 729         case eReadMore:
 730         case eReadPayload:
 731         case eConnect:
 732         case eTerminateConnection:
 733         case eAbort:
 734                 return;
 735         }
 736         SetNextTimeout(&Msg->IO, Timeout);
 737 }
 738 eNextState SMTP_C_DispatchReadDone(AsyncIO *IO)
 739 {
 740         EVS_syslog(LOG_DEBUG, "%s\n", __FUNCTION__);
 741         SmtpOutMsg *Msg = IO->Data;
 742         eNextState rc;
 743
 744         rc = ReadHandlers[Msg->State](Msg);
 745         if (rc != eAbort)
 746         {
 747                 Msg->State++;
 748                 SMTPSetTimeout(rc, Msg);
 749         }
 750         return rc;
 751 }
 752 eNextState SMTP_C_DispatchWriteDone(AsyncIO *IO)
 753 {
 754         EVS_syslog(LOG_DEBUG, "%s\n", __FUNCTION__);
 755         SmtpOutMsg *Msg = IO->Data;
 756         eNextState rc;
 757
 758         rc = SendHandlers[Msg->State](Msg);
 759         SMTPSetTimeout(rc, Msg);
 760         return rc;
 761 }
 762
 763
 764 /*****************************************************************************/
 765 /*                     SMTP CLIENT ERROR CATCHERS                            */
 766 /*****************************************************************************/
 767 eNextState SMTP_C_Terminate(AsyncIO *IO)
 768 {
 769         SmtpOutMsg *Msg = IO->Data;
 770
 771         EVS_syslog(LOG_DEBUG, "%s\n", __FUNCTION__);
 772         return FinalizeMessageSend(Msg);
 773 }
 774 eNextState SMTP_C_TerminateDB(AsyncIO *IO)
 775 {
 776         EVS_syslog(LOG_DEBUG, "%s\n", __FUNCTION__);
 777         return Terminate(IO);
 778 }
 779 eNextState SMTP_C_Timeout(AsyncIO *IO)
 780 {
 781         SmtpOutMsg *Msg = IO->Data;
 782
 783         Msg->MyQEntry->Status = 4;
 784         EVS_syslog(LOG_DEBUG, "%s\n", __FUNCTION__);
 785         StrBufPrintf(IO->ErrMsg, "Timeout: %s while talking to %s",
 786                      ReadErrors[Msg->State].Key,
 787                      Msg->mx_host);
 788         if (Msg->State > eRCPT)
 789                 return eAbort;
 790         else
 791                 return FailOneAttempt(IO);
 792 }
 793 eNextState SMTP_C_ConnFail(AsyncIO *IO)
 794 {
 795         SmtpOutMsg *Msg = IO->Data;
 796
 797         Msg->MyQEntry->Status = 4;
 798         EVS_syslog(LOG_DEBUG, "%s\n", __FUNCTION__);
 799         StrBufPrintf(IO->ErrMsg, "Connection failure: %s while talking to %s",
 800                      ReadErrors[Msg->State].Key,
 801                      Msg->mx_host);
 802
 803         return FailOneAttempt(IO);
 804 }
 805 eNextState SMTP_C_DNSFail(AsyncIO *IO)
 806 {
 807         SmtpOutMsg *Msg = IO->Data;
 808         Msg->MyQEntry->Status = 4;
 809         EVS_syslog(LOG_DEBUG, "%s\n", __FUNCTION__);
 810         return FailOneAttempt(IO);
 811 }
 812 eNextState SMTP_C_Shutdown(AsyncIO *IO)
 813 {
 814         EVS_syslog(LOG_DEBUG, "%s\n", __FUNCTION__);
 815         SmtpOutMsg *Msg = IO->Data;
 816
 817         switch (IO->NextState) {
 818         case eSendDNSQuery:
 819         case eReadDNSReply:
 820
 821                 /* todo: abort c-ares */
 822         case eConnect:
 823         case eSendReply:
 824         case eSendMore:
 825         case eSendFile:
 826         case eReadMessage:
 827         case eReadMore:
 828         case eReadPayload:
 829         case eReadFile:
 830                 StopClientWatchers(IO, 1);
 831                 break;
 832         case eDBQuery:
 833
 834                 break;
 835         case eTerminateConnection:
 836         case eAbort:
 837                 break;
 838         }
 839         Msg->MyQEntry->Status = 3;
 840         StrBufPlain(Msg->MyQEntry->StatusMessage,
 841                     HKEY("server shutdown during message submit."));
 842         return FinalizeMessageSend(Msg);
 843 }
 844
 845
 846 /**
 847  * @brief lineread Handler;
 848  * understands when to read more SMTP lines, and when this is a one-lined reply.
 849  */
 850 eReadState SMTP_C_ReadServerStatus(AsyncIO *IO)
 851 {
 852         eReadState Finished = eBufferNotEmpty;
 853
 854         while (Finished == eBufferNotEmpty) {
 855                 Finished = StrBufChunkSipLine(IO->IOBuf, &IO->RecvBuf);
 856
 857                 switch (Finished) {
 858                 case eMustReadMore: /// read new from socket...
 859                         return Finished;
 860                         break;
 861                 case eBufferNotEmpty: /* shouldn't happen... */
 862                 case eReadSuccess: /// done for now...
 863                         if (StrLength(IO->IOBuf) < 4)
 864                                 continue;
 865                         if (ChrPtr(IO->IOBuf)[3] == '-')
 866                                 Finished = eBufferNotEmpty;
 867                         else
 868                                 return Finished;
 869                         break;
 870                 case eReadFail: /// WHUT?
 871                         ///todo: shut down!
 872                         break;
 873                 }
 874         }
 875         return Finished;
 876 }
 877
 878 void LogDebugEnableSMTPClient(const int n)
 879 {
 880         SMTPClientDebugEnabled = n;
 881 }
 882
 883 CTDL_MODULE_INIT(smtp_eventclient)
 884 {
 885         if (!threading)
 886                 CtdlRegisterDebugFlagHook(HKEY("smtpeventclient"), LogDebugEnableSMTPClient, &SMTPClientDebugEnabled);
 887         return "smtpeventclient";
 888 }