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