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) 1998-2009 by the citadel.org team
  24  *
  25  *  This program is free software; you can redistribute it and/or modify
  26  *  it under the terms of the GNU General Public License as published by
  27  *  the Free Software Foundation; either version 3 of the License, or
  28  *  (at your option) any later version.
  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  *  You should have received a copy of the GNU General Public License
  36  *  along with this program; if not, write to the Free Software
  37  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  38  */
  39
  40 #include "sysdep.h"
  41 #include <stdlib.h>
  42 #include <unistd.h>
  43 #include <stdio.h>
  44 #include <termios.h>
  45 #include <fcntl.h>
  46 #include <signal.h>
  47 #include <pwd.h>
  48 #include <errno.h>
  49 #include <sys/types.h>
  50 #include <syslog.h>
  51
  52 #if TIME_WITH_SYS_TIME
  53 # include <sys/time.h>
  54 # include <time.h>
  55 #else
  56 # if HAVE_SYS_TIME_H
  57 #  include <sys/time.h>
  58 # else
  59 #  include <time.h>
  60 # endif
  61 #endif
  62 #include <sys/wait.h>
  63 #include <ctype.h>
  64 #include <string.h>
  65 #include <limits.h>
  66 #include <sys/socket.h>
  67 #include <netinet/in.h>
  68 #include <arpa/inet.h>
  69 #include <libcitadel.h>
  70 #include "citadel.h"
  71 #include "server.h"
  72 #include "citserver.h"
  73 #include "support.h"
  74 #include "config.h"
  75 #include "control.h"
  76 #include "user_ops.h"
  77 #include "database.h"
  78 #include "msgbase.h"
  79 #include "internet_addressing.h"
  80 #include "genstamp.h"
  81 #include "domain.h"
  82 #include "clientsocket.h"
  83 #include "locate_host.h"
  84 #include "citadel_dirs.h"
  85
  86 #include "ctdl_module.h"
  87
  88 #include "smtp_util.h"
  89 #include "event_client.h"
  90 #include "smtpqueue.h"
  91 #include "smtp_clienthandlers.h"
  92
  93 const unsigned short DefaultMXPort = 25;
  94 void DeleteSmtpOutMsg(void *v)
  95 {
  96         SmtpOutMsg *Msg = v;
  97
  98         ares_free_data(Msg->AllMX);
  99         if (Msg->HostLookup.VParsedDNSReply != NULL)
 100                 Msg->HostLookup.DNSReplyFree(Msg->HostLookup.VParsedDNSReply);
 101         FreeURL(&Msg->Relay);
 102         FreeStrBuf(&Msg->msgtext);
 103         FreeAsyncIOContents(&Msg->IO);
 104         memset (Msg, 0, sizeof(SmtpOutMsg)); /* just to be shure... */
 105         free(Msg);
 106 }
 107
 108 eNextState SMTP_C_Shutdown(AsyncIO *IO);
 109 eNextState SMTP_C_Timeout(AsyncIO *IO);
 110 eNextState SMTP_C_ConnFail(AsyncIO *IO);
 111 eNextState SMTP_C_DispatchReadDone(AsyncIO *IO);
 112 eNextState SMTP_C_DispatchWriteDone(AsyncIO *IO);
 113 eNextState SMTP_C_DNSFail(AsyncIO *IO);
 114 eNextState SMTP_C_Terminate(AsyncIO *IO);
 115 eReadState SMTP_C_ReadServerStatus(AsyncIO *IO);
 116
 117 eNextState mx_connect_ip(AsyncIO *IO);
 118 eNextState get_one_mx_host_ip(AsyncIO *IO);
 119
 120 /******************************************************************************
 121  * So, we're finished with sending (regardless of success or failure)         *
 122  * This Message might be referenced by several Queue-Items, if we're the last,*
 123  * we need to free the memory and send bounce messages (on terminal failure)  *
 124  * else we just free our SMTP-Message struct.                                 *
 125  ******************************************************************************/
 126 void FinalizeMessageSend(SmtpOutMsg *Msg)
 127 {
 128         int IDestructQueItem;
 129         int nRemain;
 130         StrBuf *MsgData;
 131         AsyncIO *IO = &Msg->IO;
 132         EVS_syslog(LOG_DEBUG, "SMTP: %s\n", __FUNCTION__);
 133
 134         IDestructQueItem = DecreaseQReference(Msg->MyQItem);
 135
 136         nRemain = CountActiveQueueEntries(Msg->MyQItem);
 137
 138         if ((nRemain > 0) || IDestructQueItem)
 139                 MsgData = SerializeQueueItem(Msg->MyQItem);
 140         else
 141                 MsgData = NULL;
 142
 143         /*
 144          * Uncompleted delivery instructions remain, so delete the old
 145          * instructions and replace with the updated ones.
 146          */
 147         EVS_syslog(LOG_DEBUG, "SMTPQD: %ld", Msg->MyQItem->QueMsgID);
 148         CtdlDeleteMessages(SMTP_SPOOLOUT_ROOM, &Msg->MyQItem->QueMsgID, 1, "");
 149
 150         if (IDestructQueItem)
 151                 smtpq_do_bounce(Msg->MyQItem,Msg->msgtext);
 152
 153         if (nRemain > 0)
 154         {
 155                 struct CtdlMessage *msg;
 156                 msg = malloc(sizeof(struct CtdlMessage));
 157                 memset(msg, 0, sizeof(struct CtdlMessage));
 158                 msg->cm_magic = CTDLMESSAGE_MAGIC;
 159                 msg->cm_anon_type = MES_NORMAL;
 160                 msg->cm_format_type = FMT_RFC822;
 161                 msg->cm_fields['M'] = SmashStrBuf(&MsgData);
 162                 Msg->MyQItem->QueMsgID =
 163                         CtdlSubmitMsg(msg, NULL, SMTP_SPOOLOUT_ROOM, QP_EADDR);
 164                 EVS_syslog(LOG_DEBUG, "SMTPQ: %ld", Msg->MyQItem->QueMsgID);
 165                 CtdlFreeMessage(msg);
 166         }
 167         else {
 168                 CtdlDeleteMessages(SMTP_SPOOLOUT_ROOM,
 169                                    &Msg->MyQItem->MessageID,
 170                                    1,
 171                                    "");
 172                 FreeStrBuf(&MsgData);
 173         }
 174         if (IDestructQueItem)
 175                 RemoveQItem(Msg->MyQItem);
 176
 177         RemoveContext(Msg->IO.CitContext);
 178         DeleteSmtpOutMsg(Msg);
 179 }
 180
 181 eNextState FailOneAttempt(AsyncIO *IO)
 182 {
 183         SmtpOutMsg *SendMsg = IO->Data;
 184
 185         if (SendMsg->MyQEntry->Status == 2)
 186                 return eAbort;
 187
 188         /*
 189          * possible ways here:
 190          * - connection timeout
 191          * -
 192          */
 193         StopClientWatchers(IO);
 194
 195         if (SendMsg->pCurrRelay != NULL)
 196                 SendMsg->pCurrRelay = SendMsg->pCurrRelay->Next;
 197
 198         if (SendMsg->pCurrRelay == NULL)
 199                 return eAbort;
 200         if (SendMsg->pCurrRelay->IsIP)
 201                 return mx_connect_ip(IO);
 202         else
 203                 return get_one_mx_host_ip(IO);
 204 }
 205
 206
 207 void SetConnectStatus(AsyncIO *IO)
 208 {
 209
 210         SmtpOutMsg *SendMsg = IO->Data;
 211         char buf[256];
 212         void *src;
 213
 214         buf[0] = '\0';
 215
 216         if (IO->ConnectMe->IPv6) {
 217                 src = &IO->ConnectMe->Addr.sin6_addr;
 218         }
 219         else {
 220                 struct sockaddr_in *addr = (struct sockaddr_in *)&IO->ConnectMe->Addr;
 221
 222                 src = &addr->sin_addr.s_addr;
 223         }
 224
 225         inet_ntop((IO->ConnectMe->IPv6)?AF_INET6:AF_INET,
 226                   src,
 227                   buf,
 228                   sizeof(buf));
 229
 230         if (SendMsg->mx_host == NULL)
 231                 SendMsg->mx_host = "<no MX-Record>";
 232
 233         EVS_syslog(LOG_DEBUG,
 234                   "SMTP client[%ld]: connecting to %s [%s]:%d ...\n",
 235                   SendMsg->n,
 236                   SendMsg->mx_host,
 237                   buf,
 238                   SendMsg->IO.ConnectMe->Port);
 239
 240         SendMsg->MyQEntry->Status = 5;
 241         StrBufPrintf(SendMsg->MyQEntry->StatusMessage,
 242                      "Timeout while connecting %s [%s]:%d ",
 243                      SendMsg->mx_host,
 244                      buf,
 245                      SendMsg->IO.ConnectMe->Port);
 246         SendMsg->IO.NextState = eConnect;
 247 }
 248
 249 /*****************************************************************************
 250  * So we connect our Relay IP here.                                          *
 251  *****************************************************************************/
 252 eNextState mx_connect_ip(AsyncIO *IO)
 253 {
 254         SmtpOutMsg *SendMsg = IO->Data;
 255
 256         EVS_syslog(LOG_DEBUG, "SMTP: %s\n", __FUNCTION__);
 257
 258         IO->ConnectMe = SendMsg->pCurrRelay;
 259         /*  Bypass the ns lookup result like this: IO->Addr.sin_addr.s_addr = inet_addr("127.0.0.1"); */
 260
 261         SetConnectStatus(IO);
 262
 263         return InitEventIO(IO, SendMsg,
 264                            SMTP_C_ConnTimeout,
 265                            SMTP_C_ReadTimeouts[0],
 266                            1);
 267 }
 268
 269 eNextState get_one_mx_host_ip_done(AsyncIO *IO)
 270 {
 271         SmtpOutMsg *SendMsg = IO->Data;
 272         struct hostent *hostent;
 273
 274         QueryCbDone(IO);
 275
 276         hostent = SendMsg->HostLookup.VParsedDNSReply;
 277         if ((SendMsg->HostLookup.DNSStatus == ARES_SUCCESS) &&
 278             (hostent != NULL) ) {
 279                 memset(&SendMsg->pCurrRelay->Addr, 0, sizeof(struct in6_addr));
 280                 if (SendMsg->pCurrRelay->IPv6) {
 281                         memcpy(&SendMsg->pCurrRelay->Addr.sin6_addr.s6_addr,
 282                                &hostent->h_addr_list[0],
 283                                sizeof(struct in6_addr));
 284
 285                         SendMsg->pCurrRelay->Addr.sin6_family = hostent->h_addrtype;
 286                         SendMsg->pCurrRelay->Addr.sin6_port   = htons(DefaultMXPort);
 287                 }
 288                 else {
 289                         struct sockaddr_in *addr = (struct sockaddr_in*) &SendMsg->pCurrRelay->Addr;
 290                         /* Bypass the ns lookup result like this: IO->Addr.sin_addr.s_addr = inet_addr("127.0.0.1"); */
 291 //                      addr->sin_addr.s_addr = htonl((uint32_t)&hostent->h_addr_list[0]);
 292                         memcpy(&addr->sin_addr.s_addr,
 293                                hostent->h_addr_list[0],
 294                                sizeof(uint32_t));
 295
 296                         addr->sin_family = hostent->h_addrtype;
 297                         addr->sin_port   = htons(DefaultMXPort);
 298
 299                 }
 300                 SendMsg->mx_host = SendMsg->pCurrRelay->Host;
 301                 return mx_connect_ip(IO);
 302         }
 303         else // TODO: here we need to find out whether there are more mx'es, backup relay, and so on
 304                 return FailOneAttempt(IO);
 305 }
 306
 307 eNextState get_one_mx_host_ip(AsyncIO *IO)
 308 {
 309         SmtpOutMsg * SendMsg = IO->Data;
 310         /*
 311          * here we start with the lookup of one host. it might be...
 312          * - the relay host *sigh*
 313          * - the direct hostname if there was no mx record
 314          * - one of the mx'es
 315          */
 316
 317         InitC_ares_dns(IO);
 318
 319         EVS_syslog(LOG_DEBUG, "SMTP: %s\n", __FUNCTION__);
 320
 321         EVS_syslog(LOG_DEBUG,
 322                   "SMTP client[%ld]: looking up %s-Record %s : %d ...\n",
 323                   SendMsg->n,
 324                   (SendMsg->pCurrRelay->IPv6)? "aaaa": "a",
 325                   SendMsg->pCurrRelay->Host,
 326                   SendMsg->pCurrRelay->Port);
 327
 328         if (!QueueQuery((SendMsg->pCurrRelay->IPv6)? ns_t_aaaa : ns_t_a,
 329                         SendMsg->pCurrRelay->Host,
 330                         &SendMsg->IO,
 331                         &SendMsg->HostLookup,
 332                         get_one_mx_host_ip_done))
 333         {
 334                 SendMsg->MyQEntry->Status = 5;
 335                 StrBufPrintf(SendMsg->MyQEntry->StatusMessage,
 336                              "No MX hosts found for <%s>", SendMsg->node);
 337                 SendMsg->IO.NextState = eTerminateConnection;
 338                 return IO->NextState;
 339         }
 340         IO->NextState = eReadDNSReply;
 341         return IO->NextState;
 342 }
 343
 344
 345 /*****************************************************************************
 346  * here we try to find out about the MX records for our recipients.          *
 347  *****************************************************************************/
 348 eNextState smtp_resolve_mx_record_done(AsyncIO *IO)
 349 {
 350         SmtpOutMsg * SendMsg = IO->Data;
 351         ParsedURL **pp;
 352
 353         QueryCbDone(IO);
 354
 355         EVS_syslog(LOG_DEBUG, "SMTP: %s\n", __FUNCTION__);
 356         pp = &SendMsg->Relay;
 357         while ((pp != NULL) && (*pp != NULL) && ((*pp)->Next != NULL))
 358                 pp = &(*pp)->Next;
 359
 360         if ((IO->DNSQuery->DNSStatus == ARES_SUCCESS) &&
 361             (IO->DNSQuery->VParsedDNSReply != NULL))
 362         { /* ok, we found mx records. */
 363                 SendMsg->IO.ErrMsg = SendMsg->MyQEntry->StatusMessage;
 364
 365                 SendMsg->CurrMX    = SendMsg->AllMX
 366                                    = IO->DNSQuery->VParsedDNSReply;
 367                 while (SendMsg->CurrMX) {
 368                         int i;
 369                         for (i = 0; i < 2; i++) {
 370                                 ParsedURL *p;
 371
 372                                 p = (ParsedURL*) malloc(sizeof(ParsedURL));
 373                                 memset(p, 0, sizeof(ParsedURL));
 374                                 p->IsIP = 0;
 375                                 p->Port = DefaultMXPort;
 376                                 p->IPv6 = i == 1;
 377                                 p->Host = SendMsg->CurrMX->host;
 378
 379                                 *pp = p;
 380                                 pp = &p->Next;
 381                         }
 382                         SendMsg->CurrMX    = SendMsg->CurrMX->next;
 383                 }
 384                 SendMsg->CXFlags   = SendMsg->CXFlags & F_HAVE_MX;
 385         }
 386         else { /* else fall back to the plain hostname */
 387                 int i;
 388                 for (i = 0; i < 2; i++) {
 389                         ParsedURL *p;
 390
 391                         p = (ParsedURL*) malloc(sizeof(ParsedURL));
 392                         memset(p, 0, sizeof(ParsedURL));
 393                         p->IsIP = 0;
 394                         p->Port = DefaultMXPort;
 395                         p->IPv6 = i == 1;
 396                         p->Host = SendMsg->node;
 397
 398                         *pp = p;
 399                         pp = &p->Next;
 400                 }
 401                 SendMsg->CXFlags   = SendMsg->CXFlags & F_DIRECT;
 402         }
 403         *pp = SendMsg->MyQItem->FallBackHost;
 404         SendMsg->pCurrRelay = SendMsg->Relay;
 405         return get_one_mx_host_ip(IO);
 406 }
 407
 408 eNextState resolve_mx_records(AsyncIO *IO)
 409 {
 410         SmtpOutMsg * SendMsg = IO->Data;
 411
 412         EVS_syslog(LOG_DEBUG, "SMTP: %s\n", __FUNCTION__);
 413         /* start resolving MX records here. */
 414         if (!QueueQuery(ns_t_mx,
 415                         SendMsg->node,
 416                         &SendMsg->IO,
 417                         &SendMsg->MxLookup,
 418                         smtp_resolve_mx_record_done))
 419         {
 420                 SendMsg->MyQEntry->Status = 5;
 421                 StrBufPrintf(SendMsg->MyQEntry->StatusMessage,
 422                              "No MX hosts found for <%s>", SendMsg->node);
 423                 return IO->NextState;
 424         }
 425         SendMsg->IO.NextState = eReadDNSReply;
 426         return IO->NextState;
 427 }
 428
 429
 430
 431 /******************************************************************************
 432  *  so, we're going to start a SMTP delivery.  lets get it on.                *
 433  ******************************************************************************/
 434
 435 SmtpOutMsg *new_smtp_outmsg(OneQueItem *MyQItem,
 436                             MailQEntry *MyQEntry,
 437                             int MsgCount)
 438 {
 439         SmtpOutMsg * SendMsg;
 440
 441         SendMsg = (SmtpOutMsg *) malloc(sizeof(SmtpOutMsg));
 442         memset(SendMsg, 0, sizeof(SmtpOutMsg));
 443
 444         SendMsg->n                = MsgCount;
 445         SendMsg->MyQEntry         = MyQEntry;
 446         SendMsg->MyQItem          = MyQItem;
 447         SendMsg->pCurrRelay       = MyQItem->URL;
 448
 449         SendMsg->IO.Data          = SendMsg;
 450
 451         SendMsg->IO.SendDone      = SMTP_C_DispatchWriteDone;
 452         SendMsg->IO.ReadDone      = SMTP_C_DispatchReadDone;
 453         SendMsg->IO.Terminate     = SMTP_C_Terminate;
 454         SendMsg->IO.LineReader    = SMTP_C_ReadServerStatus;
 455         SendMsg->IO.ConnFail      = SMTP_C_ConnFail;
 456         SendMsg->IO.DNSFail       = SMTP_C_DNSFail;
 457         SendMsg->IO.Timeout       = SMTP_C_Timeout;
 458         SendMsg->IO.ShutdownAbort = SMTP_C_Shutdown;
 459
 460         SendMsg->IO.SendBuf.Buf   = NewStrBufPlain(NULL, 1024);
 461         SendMsg->IO.RecvBuf.Buf   = NewStrBufPlain(NULL, 1024);
 462         SendMsg->IO.IOBuf         = NewStrBuf();
 463
 464         SendMsg->IO.NextState     = eReadMessage;
 465
 466         return SendMsg;
 467 }
 468
 469 void smtp_try_one_queue_entry(OneQueItem *MyQItem,
 470                               MailQEntry *MyQEntry,
 471                               StrBuf *MsgText,
 472                               int KeepMsgText,  /* KeepMsgText allows us to use MsgText as ours. */
 473                               int MsgCount)
 474 {
 475         SmtpOutMsg *SendMsg;
 476
 477         syslog(LOG_DEBUG, "SMTP: %s\n", __FUNCTION__);
 478
 479         SendMsg = new_smtp_outmsg(MyQItem, MyQEntry, MsgCount);
 480         if (KeepMsgText) SendMsg->msgtext = MsgText;
 481         else             SendMsg->msgtext = NewStrBufDup(MsgText);
 482
 483         if (smtp_resolve_recipients(SendMsg)) {
 484                 CitContext *SubC;
 485                 SubC = CloneContext (CC);
 486                 SubC->session_specific_data = (char*) SendMsg;
 487                 SendMsg->IO.CitContext = SubC;
 488
 489                 syslog(LOG_DEBUG, "SMTP Starting: [%ld] <%s> \n",
 490                        SendMsg->MyQItem->MessageID,
 491                        ChrPtr(SendMsg->MyQEntry->Recipient));
 492                 if (SendMsg->pCurrRelay == NULL)
 493                         QueueEventContext(&SendMsg->IO,
 494                                           resolve_mx_records);
 495                 else { /* oh... via relay host */
 496                         if (SendMsg->pCurrRelay->IsIP) {
 497                                 QueueEventContext(&SendMsg->IO,
 498                                                   mx_connect_ip);
 499                         }
 500                         else { /* uneducated admin has chosen to add DNS to the equation... */
 501                                 QueueEventContext(&SendMsg->IO,
 502                                                   get_one_mx_host_ip);
 503                         }
 504                 }
 505         }
 506         else {
 507                 /* No recipients? well fail then. */
 508                 if ((SendMsg==NULL) ||
 509                     (SendMsg->MyQEntry == NULL)) {
 510                         SendMsg->MyQEntry->Status = 5;
 511                         StrBufPlain(SendMsg->MyQEntry->StatusMessage,
 512                                     HKEY("Invalid Recipient!"));
 513                 }
 514                 FinalizeMessageSend(SendMsg);
 515         }
 516 }
 517
 518
 519
 520
 521
 522
 523 /*****************************************************************************/
 524 /*                     SMTP CLIENT DISPATCHER                                */
 525 /*****************************************************************************/
 526
 527 void SMTPSetTimeout(eNextState NextTCPState, SmtpOutMsg *pMsg)
 528 {
 529         double Timeout = 0.0;
 530         AsyncIO *IO = &pMsg->IO;
 531
 532         EVS_syslog(LOG_DEBUG, "SMTP: %s\n", __FUNCTION__);
 533
 534         switch (NextTCPState) {
 535         case eSendFile:
 536         case eSendReply:
 537         case eSendMore:
 538                 Timeout = SMTP_C_SendTimeouts[pMsg->State];
 539                 if (pMsg->State == eDATABody) {
 540                         /* if we're sending a huge message, we need more time. */
 541                         Timeout += StrLength(pMsg->msgtext) / 1024;
 542                 }
 543                 break;
 544         case eReadMessage:
 545                 Timeout = SMTP_C_ReadTimeouts[pMsg->State];
 546                 if (pMsg->State == eDATATerminateBody) {
 547                         /*
 548                          * some mailservers take a nap before accepting the message
 549                          * content inspection and such.
 550                          */
 551                         Timeout += StrLength(pMsg->msgtext) / 1024;
 552                 }
 553                 break;
 554         case eSendDNSQuery:
 555         case eReadDNSReply:
 556         case eDBQuery:
 557         case eReadFile:
 558         case eReadMore:
 559         case eReadPayload:
 560         case eConnect:
 561         case eTerminateConnection:
 562         case eAbort:
 563                 return;
 564         }
 565         SetNextTimeout(&pMsg->IO, Timeout);
 566 }
 567 eNextState SMTP_C_DispatchReadDone(AsyncIO *IO)
 568 {
 569         EVS_syslog(LOG_DEBUG, "SMTP: %s\n", __FUNCTION__);
 570         SmtpOutMsg *pMsg = IO->Data;
 571         eNextState rc;
 572
 573         rc = ReadHandlers[pMsg->State](pMsg);
 574         if (rc != eAbort)
 575         {
 576                 pMsg->State++;
 577                 SMTPSetTimeout(rc, pMsg);
 578         }
 579         return rc;
 580 }
 581 eNextState SMTP_C_DispatchWriteDone(AsyncIO *IO)
 582 {
 583         EVS_syslog(LOG_DEBUG, "SMTP: %s\n", __FUNCTION__);
 584         SmtpOutMsg *pMsg = IO->Data;
 585         eNextState rc;
 586
 587         rc = SendHandlers[pMsg->State](pMsg);
 588         SMTPSetTimeout(rc, pMsg);
 589         return rc;
 590 }
 591
 592
 593 /*****************************************************************************/
 594 /*                     SMTP CLIENT ERROR CATCHERS                            */
 595 /*****************************************************************************/
 596 eNextState SMTP_C_Terminate(AsyncIO *IO)
 597 {
 598         SmtpOutMsg *pMsg = IO->Data;
 599
 600         EVS_syslog(LOG_DEBUG, "SMTP: %s\n", __FUNCTION__);
 601         FinalizeMessageSend(pMsg);
 602         return eAbort;
 603 }
 604 eNextState SMTP_C_Timeout(AsyncIO *IO)
 605 {
 606         SmtpOutMsg *pMsg = IO->Data;
 607
 608         EVS_syslog(LOG_DEBUG, "SMTP: %s\n", __FUNCTION__);
 609         StrBufPlain(IO->ErrMsg, CKEY(ReadErrors[pMsg->State]));
 610         return FailOneAttempt(IO);
 611 }
 612 eNextState SMTP_C_ConnFail(AsyncIO *IO)
 613 {
 614         SmtpOutMsg *pMsg = IO->Data;
 615
 616         EVS_syslog(LOG_DEBUG, "SMTP: %s\n", __FUNCTION__);
 617         StrBufPlain(IO->ErrMsg, CKEY(ReadErrors[pMsg->State]));
 618         return FailOneAttempt(IO);
 619 }
 620 eNextState SMTP_C_DNSFail(AsyncIO *IO)
 621 {
 622         SmtpOutMsg *pMsg = IO->Data;
 623
 624         EVS_syslog(LOG_DEBUG, "SMTP: %s\n", __FUNCTION__);
 625         StrBufPlain(IO->ErrMsg, CKEY(ReadErrors[pMsg->State]));
 626         return FailOneAttempt(IO);
 627 }
 628 eNextState SMTP_C_Shutdown(AsyncIO *IO)
 629 {
 630         EVS_syslog(LOG_DEBUG, "SMTP: %s\n", __FUNCTION__);
 631         SmtpOutMsg *pMsg = IO->Data;
 632
 633         pMsg->MyQEntry->Status = 3;
 634         StrBufPlain(pMsg->MyQEntry->StatusMessage, HKEY("server shutdown during message submit."));
 635         FinalizeMessageSend(pMsg);
 636         return eAbort;
 637 }
 638
 639
 640 /**
 641  * @brief lineread Handler; understands when to read more SMTP lines, and when this is a one-lined reply.
 642  */
 643 eReadState SMTP_C_ReadServerStatus(AsyncIO *IO)
 644 {
 645         eReadState Finished = eBufferNotEmpty;
 646
 647         while (Finished == eBufferNotEmpty) {
 648                 Finished = StrBufChunkSipLine(IO->IOBuf, &IO->RecvBuf);
 649
 650                 switch (Finished) {
 651                 case eMustReadMore: /// read new from socket...
 652                         return Finished;
 653                         break;
 654                 case eBufferNotEmpty: /* shouldn't happen... */
 655                 case eReadSuccess: /// done for now...
 656                         if (StrLength(IO->IOBuf) < 4)
 657                                 continue;
 658                         if (ChrPtr(IO->IOBuf)[3] == '-')
 659                                 Finished = eBufferNotEmpty;
 660                         else
 661                                 return Finished;
 662                         break;
 663                 case eReadFail: /// WHUT?
 664                         ///todo: shut down!
 665                         break;
 666                 }
 667         }
 668         return Finished;
 669 }
 670
 671 CTDL_MODULE_INIT(smtp_eventclient)
 672 {
 673         return "smtpeventclient";
 674 }