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 int SMTPClientDebugEnabled = 0;
  94 void DeleteSmtpOutMsg(void *v)
  95 {
  96         SmtpOutMsg *Msg = v;
  97         AsyncIO *IO = &Msg->IO;
  98         EV_syslog(LOG_DEBUG, "%s Exit\n", __FUNCTION__);
  99
 100         /* these are kept in our own space and free'd below */
 101         Msg->IO.ConnectMe = NULL;
 102
 103         ares_free_data(Msg->AllMX);
 104         if (Msg->HostLookup.VParsedDNSReply != NULL)
 105                 Msg->HostLookup.DNSReplyFree(Msg->HostLookup.VParsedDNSReply);
 106         FreeURL(&Msg->Relay);
 107         FreeStrBuf(&Msg->msgtext);
 108         FreeAsyncIOContents(&Msg->IO);
 109         memset (Msg, 0, sizeof(SmtpOutMsg)); /* just to be shure... */
 110         free(Msg);
 111 }
 112
 113 eNextState SMTP_C_Shutdown(AsyncIO *IO);
 114 eNextState SMTP_C_Timeout(AsyncIO *IO);
 115 eNextState SMTP_C_ConnFail(AsyncIO *IO);
 116 eNextState SMTP_C_DispatchReadDone(AsyncIO *IO);
 117 eNextState SMTP_C_DispatchWriteDone(AsyncIO *IO);
 118 eNextState SMTP_C_DNSFail(AsyncIO *IO);
 119 eNextState SMTP_C_Terminate(AsyncIO *IO);
 120 eNextState SMTP_C_TerminateDB(AsyncIO *IO);
 121 eReadState SMTP_C_ReadServerStatus(AsyncIO *IO);
 122
 123 eNextState mx_connect_ip(AsyncIO *IO);
 124 eNextState get_one_mx_host_ip(AsyncIO *IO);
 125
 126 /******************************************************************************
 127  * So, we're finished with sending (regardless of success or failure)         *
 128  * This Message might be referenced by several Queue-Items, if we're the last,*
 129  * we need to free the memory and send bounce messages (on terminal failure)  *
 130  * else we just free our SMTP-Message struct.                                 *
 131  ******************************************************************************/
 132 eNextState FinalizeMessageSend_DB(AsyncIO *IO)
 133 {
 134         const char *Status;
 135         SmtpOutMsg *Msg = IO->Data;
 136
 137         if (Msg->MyQEntry->Status == 2)
 138                 Status = "Delivery successful.";
 139         else if (Msg->MyQEntry->Status == 5)
 140                 Status = "Delivery failed permanently; giving up.";
 141         else
 142                 Status = "Delivery failed temporarily; will retry later.";
 143
 144         EVS_syslog(LOG_INFO,
 145                    "%s Time[%fs] Recipient <%s> @ <%s> (%s) Status message: %s\n",
 146                    Status,
 147                    Msg->IO.Now - Msg->IO.StartIO,
 148                    Msg->user,
 149                    Msg->node,
 150                    Msg->name,
 151                    ChrPtr(Msg->MyQEntry->StatusMessage));
 152
 153
 154         Msg->IDestructQueItem = DecreaseQReference(Msg->MyQItem);
 155
 156         Msg->nRemain = CountActiveQueueEntries(Msg->MyQItem);
 157
 158         if (Msg->MyQEntry->Active &&
 159             CheckQEntryIsBounce(Msg->MyQEntry))
 160         {
 161                 /* are we casue for a bounce mail? */
 162                 Msg->MyQItem->SendBounceMail |= (1<<Msg->MyQEntry->Status);
 163         }
 164
 165         if ((Msg->nRemain > 0) || Msg->IDestructQueItem)
 166                 Msg->QMsgData = SerializeQueueItem(Msg->MyQItem);
 167         else
 168                 Msg->QMsgData = NULL;
 169
 170         /*
 171          * Uncompleted delivery instructions remain, so delete the old
 172          * instructions and replace with the updated ones.
 173          */
 174         EVS_syslog(LOG_DEBUG, "%ld", Msg->MyQItem->QueMsgID);
 175         CtdlDeleteMessages(SMTP_SPOOLOUT_ROOM, &Msg->MyQItem->QueMsgID, 1, "");
 176         Msg->MyQItem->QueMsgID = -1;
 177
 178         if (Msg->IDestructQueItem)
 179                 smtpq_do_bounce(Msg->MyQItem, Msg->msgtext);
 180
 181         if (Msg->nRemain > 0)
 182         {
 183                 struct CtdlMessage *msg;
 184                 msg = malloc(sizeof(struct CtdlMessage));
 185                 memset(msg, 0, sizeof(struct CtdlMessage));
 186                 msg->cm_magic = CTDLMESSAGE_MAGIC;
 187                 msg->cm_anon_type = MES_NORMAL;
 188                 msg->cm_format_type = FMT_RFC822;
 189                 msg->cm_fields['M'] = SmashStrBuf(&Msg->QMsgData);
 190                 msg->cm_fields['U'] = strdup("QMSG");
 191                 Msg->MyQItem->QueMsgID =
 192                         CtdlSubmitMsg(msg, NULL, SMTP_SPOOLOUT_ROOM, QP_EADDR);
 193                 EVS_syslog(LOG_DEBUG, "%ld", Msg->MyQItem->QueMsgID);
 194                 CtdlFreeMessage(msg);
 195         }
 196         else {
 197                 CtdlDeleteMessages(SMTP_SPOOLOUT_ROOM,
 198                                    &Msg->MyQItem->MessageID,
 199                                    1,
 200                                    "");
 201                 FreeStrBuf(&Msg->QMsgData);
 202         }
 203
 204         RemoveContext(Msg->IO.CitContext);
 205         return eAbort;
 206 }
 207
 208 eNextState Terminate(AsyncIO *IO)
 209 {
 210         SmtpOutMsg *Msg = IO->Data;
 211
 212         if (Msg->IDestructQueItem)
 213                 RemoveQItem(Msg->MyQItem);
 214
 215         DeleteSmtpOutMsg(Msg);
 216         return eAbort;
 217 }
 218 eNextState FinalizeMessageSend(SmtpOutMsg *Msg)
 219 {
 220         /* hand over to DB Queue */
 221         return QueueDBOperation(&Msg->IO, FinalizeMessageSend_DB);
 222 }
 223
 224 eNextState FailOneAttempt(AsyncIO *IO)
 225 {
 226         SmtpOutMsg *Msg = IO->Data;
 227
 228         if (Msg->MyQEntry->Status == 2)
 229                 return eAbort;
 230
 231         /*
 232          * possible ways here:
 233          * - connection timeout
 234          * - dns lookup failed
 235          */
 236         StopClientWatchers(IO);
 237
 238         if (Msg->pCurrRelay != NULL)
 239                 Msg->pCurrRelay = Msg->pCurrRelay->Next;
 240
 241         if (Msg->pCurrRelay == NULL) {
 242                 EVS_syslog(LOG_DEBUG, "%s Aborting\n", __FUNCTION__);
 243                 return eAbort;
 244         }
 245         if (Msg->pCurrRelay->IsIP) {
 246                 EVS_syslog(LOG_DEBUG, "%s connecting IP\n", __FUNCTION__);
 247                 return mx_connect_ip(IO);
 248         }
 249         else {
 250                 EVS_syslog(LOG_DEBUG,
 251                            "%s resolving next MX Record\n",
 252                            __FUNCTION__);
 253                 return get_one_mx_host_ip(IO);
 254         }
 255 }
 256
 257
 258 void SetConnectStatus(AsyncIO *IO)
 259 {
 260         SmtpOutMsg *Msg = IO->Data;
 261         char buf[256];
 262         void *src;
 263
 264         buf[0] = '\0';
 265
 266         if (IO->ConnectMe->IPv6) {
 267                 src = &IO->ConnectMe->Addr.sin6_addr;
 268         }
 269         else {
 270                 struct sockaddr_in *addr;
 271
 272                 addr = (struct sockaddr_in *)&IO->ConnectMe->Addr;
 273                 src = &addr->sin_addr.s_addr;
 274         }
 275
 276         inet_ntop((IO->ConnectMe->IPv6)?AF_INET6:AF_INET,
 277                   src,
 278                   buf,
 279                   sizeof(buf));
 280
 281         if (Msg->mx_host == NULL)
 282                 Msg->mx_host = "<no MX-Record>";
 283
 284         EVS_syslog(LOG_INFO,
 285                   "connecting to %s [%s]:%d ...\n",
 286                   Msg->mx_host,
 287                   buf,
 288                   Msg->IO.ConnectMe->Port);
 289
 290         Msg->MyQEntry->Status = 4;
 291         StrBufPrintf(Msg->MyQEntry->StatusMessage,
 292                      "Timeout while connecting %s [%s]:%d ",
 293                      Msg->mx_host,
 294                      buf,
 295                      Msg->IO.ConnectMe->Port);
 296         Msg->IO.NextState = eConnect;
 297 }
 298
 299 /*****************************************************************************
 300  * So we connect our Relay IP here.                                          *
 301  *****************************************************************************/
 302 eNextState mx_connect_ip(AsyncIO *IO)
 303 {
 304         SmtpOutMsg *Msg = IO->Data;
 305
 306         EVS_syslog(LOG_DEBUG, "%s\n", __FUNCTION__);
 307
 308         IO->ConnectMe = Msg->pCurrRelay;
 309         Msg->State = eConnectMX;
 310
 311         SetConnectStatus(IO);
 312
 313         return EvConnectSock(IO,
 314                              SMTP_C_ConnTimeout,
 315                              SMTP_C_ReadTimeouts[0],
 316                              1);
 317 }
 318
 319 eNextState get_one_mx_host_ip_done(AsyncIO *IO)
 320 {
 321         SmtpOutMsg *Msg = IO->Data;
 322         struct hostent *hostent;
 323
 324         IO->ConnectMe = Msg->pCurrRelay;
 325
 326         QueryCbDone(IO);
 327         EVS_syslog(LOG_DEBUG, "%s Time[%fs]\n",
 328                    __FUNCTION__,
 329                    IO->Now - IO->DNS.Start);
 330
 331         hostent = Msg->HostLookup.VParsedDNSReply;
 332         if ((Msg->HostLookup.DNSStatus == ARES_SUCCESS) &&
 333             (hostent != NULL) ) {
 334                 memset(&Msg->pCurrRelay->Addr, 0, sizeof(struct in6_addr));
 335                 if (Msg->pCurrRelay->IPv6) {
 336                         memcpy(&Msg->pCurrRelay->Addr.sin6_addr.s6_addr,
 337                                &hostent->h_addr_list[0],
 338                                sizeof(struct in6_addr));
 339
 340                         Msg->pCurrRelay->Addr.sin6_family =
 341                                 hostent->h_addrtype;
 342                         Msg->pCurrRelay->Addr.sin6_port =
 343                                 htons(Msg->IO.ConnectMe->Port);
 344                 }
 345                 else {
 346                         struct sockaddr_in *addr;
 347                         /*
 348                          * Bypass the ns lookup result like this:
 349                          * IO->Addr.sin_addr.s_addr = inet_addr("127.0.0.1");
 350                          * addr->sin_addr.s_addr =
 351                          *   htonl((uint32_t)&hostent->h_addr_list[0]);
 352                          */
 353
 354                         addr = (struct sockaddr_in*) &Msg->pCurrRelay->Addr;
 355
 356                         memcpy(&addr->sin_addr.s_addr,
 357                                hostent->h_addr_list[0],
 358                                sizeof(uint32_t));
 359
 360                         addr->sin_family = hostent->h_addrtype;
 361                         addr->sin_port   = htons(Msg->IO.ConnectMe->Port);
 362                 }
 363                 Msg->mx_host = Msg->pCurrRelay->Host;
 364                 if (Msg->HostLookup.VParsedDNSReply != NULL) {
 365                         Msg->HostLookup.DNSReplyFree(Msg->HostLookup.VParsedDNSReply);
 366                         Msg->HostLookup.VParsedDNSReply = NULL;
 367                 }
 368                 return mx_connect_ip(IO);
 369         }
 370         else {
 371                 if (Msg->HostLookup.VParsedDNSReply != NULL) {
 372                         Msg->HostLookup.DNSReplyFree(Msg->HostLookup.VParsedDNSReply);
 373                         Msg->HostLookup.VParsedDNSReply = NULL;
 374                 }
 375                 return FailOneAttempt(IO);
 376         }
 377 }
 378
 379 eNextState get_one_mx_host_ip(AsyncIO *IO)
 380 {
 381         SmtpOutMsg * Msg = IO->Data;
 382         /*
 383          * here we start with the lookup of one host. it might be...
 384          * - the relay host *sigh*
 385          * - the direct hostname if there was no mx record
 386          * - one of the mx'es
 387          */
 388
 389         EVS_syslog(LOG_DEBUG, "%s\n", __FUNCTION__);
 390
 391         EVS_syslog(LOG_DEBUG,
 392                   "looking up %s-Record %s : %d ...\n",
 393                   (Msg->pCurrRelay->IPv6)? "aaaa": "a",
 394                   Msg->pCurrRelay->Host,
 395                   Msg->pCurrRelay->Port);
 396
 397         if (!QueueQuery((Msg->pCurrRelay->IPv6)? ns_t_aaaa : ns_t_a,
 398                         Msg->pCurrRelay->Host,
 399                         &Msg->IO,
 400                         &Msg->HostLookup,
 401                         get_one_mx_host_ip_done))
 402         {
 403                 Msg->MyQEntry->Status = 5;
 404                 StrBufPrintf(Msg->MyQEntry->StatusMessage,
 405                              "No MX hosts found for <%s>", Msg->node);
 406                 Msg->IO.NextState = eTerminateConnection;
 407                 return IO->NextState;
 408         }
 409         IO->NextState = eReadDNSReply;
 410         return IO->NextState;
 411 }
 412
 413
 414 /*****************************************************************************
 415  * here we try to find out about the MX records for our recipients.          *
 416  *****************************************************************************/
 417 eNextState smtp_resolve_mx_record_done(AsyncIO *IO)
 418 {
 419         SmtpOutMsg * Msg = IO->Data;
 420         ParsedURL **pp;
 421
 422         QueryCbDone(IO);
 423
 424         EVS_syslog(LOG_DEBUG, "%s Time[%fs]\n",
 425                    __FUNCTION__,
 426                    IO->Now - IO->DNS.Start);
 427
 428         pp = &Msg->Relay;
 429         while ((pp != NULL) && (*pp != NULL) && ((*pp)->Next != NULL))
 430                 pp = &(*pp)->Next;
 431
 432         if ((IO->DNS.Query->DNSStatus == ARES_SUCCESS) &&
 433             (IO->DNS.Query->VParsedDNSReply != NULL))
 434         { /* ok, we found mx records. */
 435
 436                 Msg->CurrMX
 437                         = Msg->AllMX
 438                         = IO->DNS.Query->VParsedDNSReply;
 439                 while (Msg->CurrMX) {
 440                         int i;
 441                         for (i = 0; i < 2; i++) {
 442                                 ParsedURL *p;
 443
 444                                 p = (ParsedURL*) malloc(sizeof(ParsedURL));
 445                                 memset(p, 0, sizeof(ParsedURL));
 446                                 p->Priority = Msg->CurrMX->priority;
 447                                 p->IsIP = 0;
 448                                 p->Port = DefaultMXPort;
 449                                 p->IPv6 = i == 1;
 450                                 p->Host = Msg->CurrMX->host;
 451                                 if (*pp == NULL)
 452                                         *pp = p;
 453                                 else {
 454                                         ParsedURL *ppp = *pp;
 455
 456                                         while ((ppp->Next != NULL) &&
 457                                                (ppp->Next->Priority <= p->Priority))
 458                                                ppp = ppp->Next;
 459                                         if ((ppp == *pp) &&
 460                                             (ppp->Priority > p->Priority)) {
 461                                                 p->Next = *pp;
 462                                                 *pp = p;
 463                                         }
 464                                         else {
 465                                                 p->Next = ppp->Next;
 466                                                 ppp->Next = p;
 467                                         }
 468                                 }
 469                         }
 470                         Msg->CurrMX    = Msg->CurrMX->next;
 471                 }
 472                 Msg->CXFlags   = Msg->CXFlags & F_HAVE_MX;
 473         }
 474         else { /* else fall back to the plain hostname */
 475                 int i;
 476                 for (i = 0; i < 2; i++) {
 477                         ParsedURL *p;
 478
 479                         p = (ParsedURL*) malloc(sizeof(ParsedURL));
 480                         memset(p, 0, sizeof(ParsedURL));
 481                         p->IsIP = 0;
 482                         p->Port = DefaultMXPort;
 483                         p->IPv6 = i == 1;
 484                         p->Host = Msg->node;
 485
 486                         *pp = p;
 487                         pp = &p->Next;
 488                 }
 489                 Msg->CXFlags   = Msg->CXFlags & F_DIRECT;
 490         }
 491         if (Msg->MyQItem->FallBackHost != NULL)
 492         {
 493                 Msg->MyQItem->FallBackHost->Next = *pp;
 494                 *pp = Msg->MyQItem->FallBackHost;
 495         }
 496         Msg->pCurrRelay = Msg->Relay;
 497         return get_one_mx_host_ip(IO);
 498 }
 499
 500 eNextState resolve_mx_records(AsyncIO *IO)
 501 {
 502         SmtpOutMsg * Msg = IO->Data;
 503
 504         EVS_syslog(LOG_DEBUG, "%s\n", __FUNCTION__);
 505         /* start resolving MX records here. */
 506         if (!QueueQuery(ns_t_mx,
 507                         Msg->node,
 508                         &Msg->IO,
 509                         &Msg->MxLookup,
 510                         smtp_resolve_mx_record_done))
 511         {
 512                 Msg->MyQEntry->Status = 5;
 513                 StrBufPrintf(Msg->MyQEntry->StatusMessage,
 514                              "No MX hosts found for <%s>", Msg->node);
 515                 return IO->NextState;
 516         }
 517         Msg->IO.NextState = eReadDNSReply;
 518         return IO->NextState;
 519 }
 520
 521
 522
 523 /******************************************************************************
 524  *  so, we're going to start a SMTP delivery.  lets get it on.                *
 525  ******************************************************************************/
 526
 527 SmtpOutMsg *new_smtp_outmsg(OneQueItem *MyQItem,
 528                             MailQEntry *MyQEntry,
 529                             int MsgCount)
 530 {
 531         SmtpOutMsg * Msg;
 532
 533         Msg = (SmtpOutMsg *) malloc(sizeof(SmtpOutMsg));
 534         if (Msg == NULL)
 535                 return NULL;
 536         memset(Msg, 0, sizeof(SmtpOutMsg));
 537
 538         Msg->n                = MsgCount;
 539         Msg->MyQEntry         = MyQEntry;
 540         Msg->MyQItem          = MyQItem;
 541         Msg->pCurrRelay       = MyQItem->URL;
 542
 543         InitIOStruct(&Msg->IO,
 544                      Msg,
 545                      eReadMessage,
 546                      SMTP_C_ReadServerStatus,
 547                      SMTP_C_DNSFail,
 548                      SMTP_C_DispatchWriteDone,
 549                      SMTP_C_DispatchReadDone,
 550                      SMTP_C_Terminate,
 551                      SMTP_C_TerminateDB,
 552                      SMTP_C_ConnFail,
 553                      SMTP_C_Timeout,
 554                      SMTP_C_Shutdown);
 555
 556         Msg->IO.ErrMsg = Msg->MyQEntry->StatusMessage;
 557
 558         return Msg;
 559 }
 560
 561 void smtp_try_one_queue_entry(OneQueItem *MyQItem,
 562                               MailQEntry *MyQEntry,
 563                               StrBuf *MsgText,
 564                         /*KeepMsgText allows us to use MsgText as ours.*/
 565                               int KeepMsgText,
 566                               int MsgCount)
 567 {
 568         SmtpOutMsg *Msg;
 569
 570         SMTPC_syslog(LOG_DEBUG, "%s\n", __FUNCTION__);
 571
 572         Msg = new_smtp_outmsg(MyQItem, MyQEntry, MsgCount);
 573         if (Msg == NULL) {
 574                 SMTPC_syslog(LOG_DEBUG, "%s Failed to alocate message context.\n", __FUNCTION__);
 575                 if (KeepMsgText)
 576                         FreeStrBuf (&MsgText);
 577                 return;
 578         }
 579         if (KeepMsgText) Msg->msgtext = MsgText;
 580         else             Msg->msgtext = NewStrBufDup(MsgText);
 581
 582         if (smtp_resolve_recipients(Msg)) {
 583
 584                 safestrncpy(
 585                         ((CitContext *)Msg->IO.CitContext)->cs_host,
 586                         Msg->node,
 587                         sizeof(((CitContext *)
 588                                 Msg->IO.CitContext)->cs_host));
 589
 590                 SMTPC_syslog(LOG_DEBUG, "Starting: [%ld] <%s> CC <%d> \n",
 591                              Msg->MyQItem->MessageID,
 592                              ChrPtr(Msg->MyQEntry->Recipient),
 593                              ((CitContext*)Msg->IO.CitContext)->cs_pid);
 594                 if (Msg->pCurrRelay == NULL)
 595                         QueueEventContext(&Msg->IO,
 596                                           resolve_mx_records);
 597                 else { /* oh... via relay host */
 598                         if (Msg->pCurrRelay->IsIP) {
 599                                 QueueEventContext(&Msg->IO,
 600                                                   mx_connect_ip);
 601                         }
 602                         else {
 603                                 /* uneducated admin has chosen to
 604                                    add DNS to the equation... */
 605                                 QueueEventContext(&Msg->IO,
 606                                                   get_one_mx_host_ip);
 607                         }
 608                 }
 609         }
 610         else {
 611                 /* No recipients? well fail then. */
 612                 if (Msg->MyQEntry != NULL) {
 613                         Msg->MyQEntry->Status = 5;
 614                         StrBufPlain(Msg->MyQEntry->StatusMessage,
 615                                     HKEY("Invalid Recipient!"));
 616                 }
 617                 FinalizeMessageSend_DB(&Msg->IO);
 618                 DeleteSmtpOutMsg(&Msg->IO);
 619         }
 620 }
 621
 622
 623
 624
 625
 626
 627 /*****************************************************************************/
 628 /*                     SMTP CLIENT DISPATCHER                                */
 629 /*****************************************************************************/
 630
 631 void SMTPSetTimeout(eNextState NextTCPState, SmtpOutMsg *Msg)
 632 {
 633         double Timeout = 0.0;
 634         AsyncIO *IO = &Msg->IO;
 635
 636         EVS_syslog(LOG_DEBUG, "%s\n", __FUNCTION__);
 637
 638         switch (NextTCPState) {
 639         case eSendFile:
 640         case eSendReply:
 641         case eSendMore:
 642                 Timeout = SMTP_C_SendTimeouts[Msg->State];
 643                 if (Msg->State == eDATABody) {
 644                         /* if we're sending a huge message,
 645                          * we need more time.
 646                          */
 647                         Timeout += StrLength(Msg->msgtext) / 512;
 648                 }
 649                 break;
 650         case eReadMessage:
 651                 Timeout = SMTP_C_ReadTimeouts[Msg->State];
 652                 if (Msg->State == eDATATerminateBody) {
 653                         /*
 654                          * some mailservers take a nap before accepting
 655                          * the message content inspection and such.
 656                          */
 657                         Timeout += StrLength(Msg->msgtext) / 512;
 658                 }
 659                 break;
 660         case eSendDNSQuery:
 661         case eReadDNSReply:
 662         case eDBQuery:
 663         case eReadFile:
 664         case eReadMore:
 665         case eReadPayload:
 666         case eConnect:
 667         case eTerminateConnection:
 668         case eAbort:
 669                 return;
 670         }
 671         SetNextTimeout(&Msg->IO, Timeout);
 672 }
 673 eNextState SMTP_C_DispatchReadDone(AsyncIO *IO)
 674 {
 675         EVS_syslog(LOG_DEBUG, "%s\n", __FUNCTION__);
 676         SmtpOutMsg *Msg = IO->Data;
 677         eNextState rc;
 678
 679         rc = ReadHandlers[Msg->State](Msg);
 680         if (rc != eAbort)
 681         {
 682                 Msg->State++;
 683                 SMTPSetTimeout(rc, Msg);
 684         }
 685         return rc;
 686 }
 687 eNextState SMTP_C_DispatchWriteDone(AsyncIO *IO)
 688 {
 689         EVS_syslog(LOG_DEBUG, "%s\n", __FUNCTION__);
 690         SmtpOutMsg *Msg = IO->Data;
 691         eNextState rc;
 692
 693         rc = SendHandlers[Msg->State](Msg);
 694         SMTPSetTimeout(rc, Msg);
 695         return rc;
 696 }
 697
 698
 699 /*****************************************************************************/
 700 /*                     SMTP CLIENT ERROR CATCHERS                            */
 701 /*****************************************************************************/
 702 eNextState SMTP_C_Terminate(AsyncIO *IO)
 703 {
 704         SmtpOutMsg *Msg = IO->Data;
 705
 706         EVS_syslog(LOG_DEBUG, "%s\n", __FUNCTION__);
 707         return FinalizeMessageSend(Msg);
 708 }
 709 eNextState SMTP_C_TerminateDB(AsyncIO *IO)
 710 {
 711         EVS_syslog(LOG_DEBUG, "%s\n", __FUNCTION__);
 712         return Terminate(IO);
 713 }
 714 eNextState SMTP_C_Timeout(AsyncIO *IO)
 715 {
 716         SmtpOutMsg *Msg = IO->Data;
 717
 718         Msg->MyQEntry->Status = 4;
 719         EVS_syslog(LOG_DEBUG, "%s\n", __FUNCTION__);
 720         StrBufPlain(IO->ErrMsg, CKEY(ReadErrors[Msg->State]));
 721         if (Msg->State > eRCPT)
 722                 return eAbort;
 723         else
 724                 return FailOneAttempt(IO);
 725 }
 726 eNextState SMTP_C_ConnFail(AsyncIO *IO)
 727 {
 728         SmtpOutMsg *Msg = IO->Data;
 729
 730         Msg->MyQEntry->Status = 4;
 731         EVS_syslog(LOG_DEBUG, "%s\n", __FUNCTION__);
 732         StrBufPlain(IO->ErrMsg, CKEY(ReadErrors[Msg->State]));
 733         return FailOneAttempt(IO);
 734 }
 735 eNextState SMTP_C_DNSFail(AsyncIO *IO)
 736 {
 737         SmtpOutMsg *Msg = IO->Data;
 738         Msg->MyQEntry->Status = 4;
 739         EVS_syslog(LOG_DEBUG, "%s\n", __FUNCTION__);
 740         return FailOneAttempt(IO);
 741 }
 742 eNextState SMTP_C_Shutdown(AsyncIO *IO)
 743 {
 744         EVS_syslog(LOG_DEBUG, "%s\n", __FUNCTION__);
 745         SmtpOutMsg *Msg = IO->Data;
 746
 747         Msg->MyQEntry->Status = 3;
 748         StrBufPlain(Msg->MyQEntry->StatusMessage,
 749                     HKEY("server shutdown during message submit."));
 750         return FinalizeMessageSend(Msg);
 751 }
 752
 753
 754 /**
 755  * @brief lineread Handler;
 756  * understands when to read more SMTP lines, and when this is a one-lined reply.
 757  */
 758 eReadState SMTP_C_ReadServerStatus(AsyncIO *IO)
 759 {
 760         eReadState Finished = eBufferNotEmpty;
 761
 762         while (Finished == eBufferNotEmpty) {
 763                 Finished = StrBufChunkSipLine(IO->IOBuf, &IO->RecvBuf);
 764
 765                 switch (Finished) {
 766                 case eMustReadMore: /// read new from socket...
 767                         return Finished;
 768                         break;
 769                 case eBufferNotEmpty: /* shouldn't happen... */
 770                 case eReadSuccess: /// done for now...
 771                         if (StrLength(IO->IOBuf) < 4)
 772                                 continue;
 773                         if (ChrPtr(IO->IOBuf)[3] == '-')
 774                                 Finished = eBufferNotEmpty;
 775                         else
 776                                 return Finished;
 777                         break;
 778                 case eReadFail: /// WHUT?
 779                         ///todo: shut down!
 780                         break;
 781                 }
 782         }
 783         return Finished;
 784 }
 785
 786 void LogDebugEnableSMTPClient(const int n)
 787 {
 788         SMTPClientDebugEnabled = n;
 789 }
 790
 791 CTDL_MODULE_INIT(smtp_eventclient)
 792 {
 793         if (!threading)
 794                 CtdlRegisterDebugFlagHook(HKEY("smtpeventclient"), LogDebugEnableSMTPClient, &SMTPClientDebugEnabled);
 795         return "smtpeventclient";
 796 }