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
  92 #ifdef EXPERIMENTAL_SMTP_EVENT_CLIENT
  93 /*****************************************************************************/
  94 /*               SMTP CLIENT (OUTBOUND PROCESSING) STUFF                     */
  95 /*****************************************************************************/
  96
  97 typedef enum _eSMTP_C_States {
  98         eConnect,
  99         eEHLO,
 100         eHELO,
 101         eSMTPAuth,
 102         eFROM,
 103         eRCPT,
 104         eDATA,
 105         eDATABody,
 106         eDATATerminateBody,
 107         eQUIT,
 108         eMaxSMTPC
 109 } eSMTP_C_States;
 110
 111 const double SMTP_C_ConnTimeout = 300.; /* wail 1 minute for connections... */
 112 const double SMTP_C_ReadTimeouts[eMaxSMTPC] = {
 113         300., /* Greeting... */
 114         30., /* EHLO */
 115         30., /* HELO */
 116         30., /* Auth */
 117         30., /* From */
 118         90., /* RCPT */
 119         30., /* DATA */
 120         90., /* DATABody */
 121         90., /* end of body... */
 122         30.  /* QUIT */
 123 };
 124 const double SMTP_C_SendTimeouts[eMaxSMTPC] = {
 125         90., /* Greeting... */
 126         30., /* EHLO */
 127         30., /* HELO */
 128         30., /* Auth */
 129         30., /* From */
 130         30., /* RCPT */
 131         30., /* DATA */
 132         90., /* DATABody */
 133         900., /* end of body... */
 134         30.  /* QUIT */
 135 };
 136
 137 static const ConstStr ReadErrors[eMaxSMTPC] = {
 138         {HKEY("Connection broken during SMTP conversation")},
 139         {HKEY("Connection broken during SMTP EHLO")},
 140         {HKEY("Connection broken during SMTP HELO")},
 141         {HKEY("Connection broken during SMTP AUTH")},
 142         {HKEY("Connection broken during SMTP MAIL FROM")},
 143         {HKEY("Connection broken during SMTP RCPT")},
 144         {HKEY("Connection broken during SMTP DATA")},
 145         {HKEY("Connection broken during SMTP message transmit")},
 146         {HKEY("")}/* quit reply, don't care. */
 147 };
 148
 149
 150 typedef struct _stmp_out_msg {
 151         MailQEntry *MyQEntry;
 152         OneQueItem *MyQItem;
 153         long n;
 154         AsyncIO IO;
 155
 156         eSMTP_C_States State;
 157
 158         struct ares_mx_reply *AllMX;
 159         struct ares_mx_reply *CurrMX;
 160         const char *mx_port;
 161         const char *mx_host;
 162
 163         struct hostent *OneMX;
 164
 165         ParsedURL *Relay;
 166         ParsedURL *pCurrRelay;
 167         StrBuf *msgtext;
 168         char *envelope_from;
 169         char user[1024];
 170         char node[1024];
 171         char name[1024];
 172         char mailfrom[1024];
 173 } SmtpOutMsg;
 174
 175 void DeleteSmtpOutMsg(void *v)
 176 {
 177         SmtpOutMsg *Msg = v;
 178
 179         ares_free_data(Msg->AllMX);
 180
 181         FreeStrBuf(&Msg->msgtext);
 182         FreeAsyncIOContents(&Msg->IO);
 183         free(Msg);
 184 }
 185
 186 eNextState SMTP_C_Timeout(AsyncIO *IO);
 187 eNextState SMTP_C_ConnFail(AsyncIO *IO);
 188 eNextState SMTP_C_DispatchReadDone(AsyncIO *IO);
 189 eNextState SMTP_C_DispatchWriteDone(AsyncIO *IO);
 190 eNextState SMTP_C_Terminate(AsyncIO *IO);
 191 eReadState SMTP_C_ReadServerStatus(AsyncIO *IO);
 192
 193 typedef eNextState (*SMTPReadHandler)(SmtpOutMsg *Msg);
 194 typedef eNextState (*SMTPSendHandler)(SmtpOutMsg *Msg);
 195
 196
 197 #define SMTP_ERROR(WHICH_ERR, ERRSTR) do {\
 198                 SendMsg->MyQEntry->Status = WHICH_ERR; \
 199                 StrBufAppendBufPlain(SendMsg->MyQEntry->StatusMessage, HKEY(ERRSTR), 0); \
 200                 return eAbort; } \
 201         while (0)
 202
 203 #define SMTP_VERROR(WHICH_ERR) do {\
 204                 SendMsg->MyQEntry->Status = WHICH_ERR; \
 205                 StrBufPlain(SendMsg->MyQEntry->StatusMessage, \
 206                             ChrPtr(SendMsg->IO.IOBuf) + 4, \
 207                             StrLength(SendMsg->IO.IOBuf) - 4); \
 208                 return eAbort; } \
 209         while (0)
 210
 211 #define SMTP_IS_STATE(WHICH_STATE) (ChrPtr(SendMsg->IO.IOBuf)[0] == WHICH_STATE)
 212
 213 #define SMTP_DBG_SEND() CtdlLogPrintf(CTDL_DEBUG, "SMTP client[%ld]: > %s\n", SendMsg->n, ChrPtr(SendMsg->IO.SendBuf.Buf))
 214 #define SMTP_DBG_READ() CtdlLogPrintf(CTDL_DEBUG, "SMTP client[%ld]: < %s\n", SendMsg->n, ChrPtr(SendMsg->IO.IOBuf))
 215
 216
 217 void FinalizeMessageSend(SmtpOutMsg *Msg)
 218 {
 219         CtdlLogPrintf(CTDL_DEBUG, "SMTP: %s\n", __FUNCTION__);
 220
 221         if (DecreaseQReference(Msg->MyQItem))
 222         {
 223                 int nRemain;
 224                 StrBuf *MsgData;
 225
 226                 nRemain = CountActiveQueueEntries(Msg->MyQItem);
 227
 228                 MsgData = SerializeQueueItem(Msg->MyQItem);
 229                 /*
 230                  * Uncompleted delivery instructions remain, so delete the old
 231                  * instructions and replace with the updated ones.
 232                  */
 233                 CtdlDeleteMessages(SMTP_SPOOLOUT_ROOM, &Msg->MyQItem->QueMsgID, 1, "");
 234                 smtpq_do_bounce(Msg->MyQItem,
 235                                Msg->msgtext);
 236                 if (nRemain > 0) {
 237                         struct CtdlMessage *msg;
 238                         msg = malloc(sizeof(struct CtdlMessage));
 239                         memset(msg, 0, sizeof(struct CtdlMessage));
 240                         msg->cm_magic = CTDLMESSAGE_MAGIC;
 241                         msg->cm_anon_type = MES_NORMAL;
 242                         msg->cm_format_type = FMT_RFC822;
 243                         msg->cm_fields['M'] = SmashStrBuf(&MsgData);
 244                         CtdlSubmitMsg(msg, NULL, SMTP_SPOOLOUT_ROOM, QP_EADDR);
 245                         CtdlFreeMessage(msg);
 246                 }
 247                 else {
 248                         CtdlDeleteMessages(SMTP_SPOOLOUT_ROOM, &Msg->MyQItem->MessageID, 1, "");
 249                         FreeStrBuf(&MsgData);
 250                 }
 251
 252                 RemoveQItem(Msg->MyQItem);
 253         }
 254         DeleteSmtpOutMsg(Msg);
 255 }
 256
 257
 258 void SetConnectStatus(AsyncIO *IO)
 259 {
 260
 261         SmtpOutMsg *SendMsg = IO->Data;
 262         char buf[256];
 263         void *src;
 264
 265         buf[0] = '\0';
 266
 267         if (IO->IP6) {
 268                 src = &IO->Addr.sin6_addr;
 269         }
 270         else {
 271                 struct sockaddr_in *addr = (struct sockaddr_in *)&IO->Addr;
 272
 273                 src = &addr->sin_addr.s_addr;
 274         }
 275
 276         inet_ntop((IO->IP6)?AF_INET6:AF_INET,
 277                   src,
 278                   buf, sizeof(buf));
 279         if (SendMsg->mx_host == NULL)
 280                 SendMsg->mx_host = "<no name>";
 281
 282         CtdlLogPrintf(CTDL_DEBUG,
 283                       "SMTP client[%ld]: connecting to %s [%s]:%d ...\n",
 284                       SendMsg->n,
 285                       SendMsg->mx_host,
 286                       buf,
 287                       SendMsg->IO.dport);
 288
 289         SendMsg->MyQEntry->Status = 5;
 290         StrBufPrintf(SendMsg->MyQEntry->StatusMessage,
 291                      "Timeout while connecting %s [%s]:%d ",
 292                      SendMsg->mx_host,
 293                      buf,
 294                      SendMsg->IO.dport);
 295 }
 296
 297 eNextState mx_connect_relay_ip(AsyncIO *IO)
 298 {
 299
 300         SmtpOutMsg *SendMsg = IO->Data;
 301
 302         CtdlLogPrintf(CTDL_DEBUG, "SMTP: %s\n", __FUNCTION__);
 303
 304         IO->IP6 = SendMsg->pCurrRelay->af == AF_INET6;
 305
 306         if (SendMsg->pCurrRelay->Port != 0)
 307                 IO->dport = SendMsg->pCurrRelay->Port;
 308
 309         memset(&IO->Addr, 0, sizeof(struct sockaddr_in6));
 310         if (IO->IP6) {
 311                 memcpy(&IO->Addr.sin6_addr.s6_addr,
 312                        &SendMsg->pCurrRelay->Addr,
 313                        sizeof(struct in6_addr));
 314
 315                 IO->Addr.sin6_family = AF_INET6;
 316                 IO->Addr.sin6_port = htons(IO->dport);
 317         }
 318         else {
 319                 struct sockaddr_in *addr = (struct sockaddr_in*) &IO->Addr;
 320                 /* Bypass the ns lookup result like this: IO->Addr.sin_addr.s_addr = inet_addr("127.0.0.1"); */
 321                 memcpy(&addr->sin_addr,///.s_addr,
 322                        &SendMsg->pCurrRelay->Addr,
 323                        sizeof(struct in_addr));
 324
 325                 addr->sin_family = AF_INET;
 326                 addr->sin_port = htons(IO->dport);
 327         }
 328
 329         SetConnectStatus(IO);
 330
 331         return InitEventIO(IO, SendMsg,
 332                            SMTP_C_ConnTimeout,
 333                            SMTP_C_ReadTimeouts[0],
 334                             1);
 335 }
 336
 337 void get_one_mx_host_ip_done(void *Ctx,
 338                              int status,
 339                              int timeouts,
 340                              struct hostent *hostent)
 341 {
 342         AsyncIO *IO = (AsyncIO *) Ctx;
 343         SmtpOutMsg *SendMsg = IO->Data;
 344         eNextState State = eAbort;
 345
 346         if ((status == ARES_SUCCESS) && (hostent != NULL) ) {
 347
 348                 IO->IP6  = hostent->h_addrtype == AF_INET6;
 349                 IO->HEnt = hostent;
 350
 351                 memset(&IO->Addr, 0, sizeof(struct in6_addr));
 352                 if (IO->IP6) {
 353                         memcpy(&IO->Addr.sin6_addr.s6_addr,
 354                                &hostent->h_addr_list[0],
 355                                sizeof(struct in6_addr));
 356
 357                         IO->Addr.sin6_family = hostent->h_addrtype;
 358                         IO->Addr.sin6_port = htons(IO->dport);
 359                 }
 360                 else {
 361                         struct sockaddr_in *addr = (struct sockaddr_in*) &IO->Addr;
 362                         /* Bypass the ns lookup result like this: IO->Addr.sin_addr.s_addr = inet_addr("127.0.0.1"); */
 363 //                      addr->sin_addr.s_addr = htonl((uint32_t)&hostent->h_addr_list[0]);
 364                         memcpy(&addr->sin_addr.s_addr, hostent->h_addr_list[0], sizeof(uint32_t));
 365
 366                         addr->sin_family = hostent->h_addrtype;
 367                         addr->sin_port = htons(IO->dport);
 368
 369                 }
 370                 SendMsg->IO.HEnt = hostent;
 371                 SetConnectStatus(IO);
 372                 State = InitEventIO(IO, SendMsg,
 373                                    SMTP_C_ConnTimeout,
 374                                    SMTP_C_ReadTimeouts[0],
 375                                    1);
 376         }
 377         if ((State == eAbort) && (IO->sock != -1))
 378                 SMTP_C_Terminate(IO);
 379 }
 380
 381 const unsigned short DefaultMXPort = 25;
 382 eNextState get_one_mx_host_ip(AsyncIO *IO)
 383 {
 384         SmtpOutMsg * SendMsg = IO->Data;
 385         const char *Hostname;
 386         //char *endpart;
 387         //char buf[SIZ];
 388         InitC_ares_dns(IO);
 389
 390         if (SendMsg->CurrMX) {
 391                 SendMsg->mx_host = SendMsg->CurrMX->host;
 392                 SendMsg->CurrMX = SendMsg->CurrMX->next;
 393         }
 394
 395         if (SendMsg->pCurrRelay != NULL) {
 396                 SendMsg->mx_host = Hostname = SendMsg->pCurrRelay->Host;
 397                 if (SendMsg->pCurrRelay->Port != 0)
 398                         SendMsg->IO.dport = SendMsg->pCurrRelay->Port;
 399         }
 400         else if (SendMsg->mx_host != NULL) Hostname = SendMsg->mx_host;
 401         else Hostname = SendMsg->node;
 402
 403         CtdlLogPrintf(CTDL_DEBUG, "SMTP: %s\n", __FUNCTION__);
 404
 405         CtdlLogPrintf(CTDL_DEBUG,
 406                       "SMTP client[%ld]: looking up %s : %d ...\n",
 407                       SendMsg->n,
 408                       Hostname,
 409                       SendMsg->IO.dport);
 410
 411         ares_gethostbyname(SendMsg->IO.DNSChannel,
 412                            Hostname,
 413                            AF_INET6, /* it falls back to ipv4 in doubt... */
 414                            get_one_mx_host_ip_done,
 415                            &SendMsg->IO);
 416         return IO->NextState;
 417 }
 418
 419
 420 eNextState smtp_resolve_mx_done(AsyncIO *IO)
 421 {
 422         SmtpOutMsg * SendMsg = IO->Data;
 423
 424         QueryCbDone(IO);
 425
 426         CtdlLogPrintf(CTDL_DEBUG, "SMTP: %s\n", __FUNCTION__);
 427
 428         SendMsg->IO.ErrMsg = SendMsg->MyQEntry->StatusMessage;
 429
 430         SendMsg->CurrMX = SendMsg->AllMX = IO->VParsedDNSReply;
 431         //// TODO: should we remove the current ares context???
 432         get_one_mx_host_ip(IO);
 433         return IO->NextState;
 434 }
 435
 436
 437 eNextState resolve_mx_records(AsyncIO *IO)
 438 {
 439         SmtpOutMsg * SendMsg = IO->Data;
 440
 441         CtdlLogPrintf(CTDL_DEBUG, "SMTP: %s\n", __FUNCTION__);
 442
 443         if (!QueueQuery(ns_t_mx,
 444                         SendMsg->node,
 445                         &SendMsg->IO,
 446                         smtp_resolve_mx_done))
 447         {
 448                 SendMsg->MyQEntry->Status = 5;
 449                 StrBufPrintf(SendMsg->MyQEntry->StatusMessage,
 450                              "No MX hosts found for <%s>", SendMsg->node);
 451                 return IO->NextState;
 452         }
 453         return eAbort;
 454 }
 455
 456
 457 int smtp_resolve_recipients(SmtpOutMsg *SendMsg)
 458 {
 459         const char *ptr;
 460         char buf[1024];
 461         int scan_done;
 462         int lp, rp;
 463         int i;
 464
 465         CtdlLogPrintf(CTDL_DEBUG, "SMTP: %s\n", __FUNCTION__);
 466
 467         if ((SendMsg==NULL) ||
 468             (SendMsg->MyQEntry == NULL) ||
 469             (StrLength(SendMsg->MyQEntry->Recipient) == 0)) {
 470                 return 0;
 471         }
 472
 473         /* Parse out the host portion of the recipient address */
 474         process_rfc822_addr(ChrPtr(SendMsg->MyQEntry->Recipient),
 475                             SendMsg->user,
 476                             SendMsg->node,
 477                             SendMsg->name);
 478
 479         CtdlLogPrintf(CTDL_DEBUG, "SMTP client[%ld]: Attempting delivery to <%s> @ <%s> (%s)\n",
 480                       SendMsg->n, SendMsg->user, SendMsg->node, SendMsg->name);
 481         /* If no envelope_from is supplied, extract one from the message */
 482         if ( (SendMsg->envelope_from == NULL) ||
 483              (IsEmptyStr(SendMsg->envelope_from)) ) {
 484                 SendMsg->mailfrom[0] = '\0';
 485                 scan_done = 0;
 486                 ptr = ChrPtr(SendMsg->msgtext);
 487                 do {
 488                         if (ptr = cmemreadline(ptr, buf, sizeof buf), *ptr == 0) {
 489                                 scan_done = 1;
 490                         }
 491                         if (!strncasecmp(buf, "From:", 5)) {
 492                                 safestrncpy(SendMsg->mailfrom, &buf[5], sizeof SendMsg->mailfrom);
 493                                 striplt(SendMsg->mailfrom);
 494                                 for (i=0; SendMsg->mailfrom[i]; ++i) {
 495                                         if (!isprint(SendMsg->mailfrom[i])) {
 496                                                 strcpy(&SendMsg->mailfrom[i], &SendMsg->mailfrom[i+1]);
 497                                                 i=0;
 498                                         }
 499                                 }
 500
 501                                 /* Strip out parenthesized names */
 502                                 lp = (-1);
 503                                 rp = (-1);
 504                                 for (i=0; !IsEmptyStr(SendMsg->mailfrom + i); ++i) {
 505                                         if (SendMsg->mailfrom[i] == '(') lp = i;
 506                                         if (SendMsg->mailfrom[i] == ')') rp = i;
 507                                 }
 508                                 if ((lp>0)&&(rp>lp)) {
 509                                         strcpy(&SendMsg->mailfrom[lp-1], &SendMsg->mailfrom[rp+1]);
 510                                 }
 511
 512                                 /* Prefer brokketized names */
 513                                 lp = (-1);
 514                                 rp = (-1);
 515                                 for (i=0; !IsEmptyStr(SendMsg->mailfrom + i); ++i) {
 516                                         if (SendMsg->mailfrom[i] == '<') lp = i;
 517                                         if (SendMsg->mailfrom[i] == '>') rp = i;
 518                                 }
 519                                 if ( (lp>=0) && (rp>lp) ) {
 520                                         SendMsg->mailfrom[rp] = 0;
 521                                         memmove(SendMsg->mailfrom,
 522                                                 &SendMsg->mailfrom[lp + 1],
 523                                                 rp - lp);
 524                                 }
 525
 526                                 scan_done = 1;
 527                         }
 528                 } while (scan_done == 0);
 529                 if (IsEmptyStr(SendMsg->mailfrom)) strcpy(SendMsg->mailfrom, "someone@somewhere.org");
 530                 stripallbut(SendMsg->mailfrom, '<', '>');
 531                 SendMsg->envelope_from = SendMsg->mailfrom;
 532         }
 533
 534         return 1;
 535 }
 536
 537
 538
 539 void smtp_try(OneQueItem *MyQItem,
 540               MailQEntry *MyQEntry,
 541               StrBuf *MsgText,
 542               int KeepMsgText,  /* KeepMsgText allows us to use MsgText as ours. */
 543               int MsgCount)
 544 {
 545         SmtpOutMsg * SendMsg;
 546
 547         CtdlLogPrintf(CTDL_DEBUG, "SMTP: %s\n", __FUNCTION__);
 548
 549         SendMsg = (SmtpOutMsg *) malloc(sizeof(SmtpOutMsg));
 550         memset(SendMsg, 0, sizeof(SmtpOutMsg));
 551         SendMsg->IO.sock      = (-1);
 552         SendMsg->IO.NextState = eReadMessage;
 553         SendMsg->n            = MsgCount++;
 554         SendMsg->MyQEntry     = MyQEntry;
 555         SendMsg->MyQItem      = MyQItem;
 556         SendMsg->pCurrRelay   = MyQItem->URL;
 557
 558         SendMsg->IO.dport       = DefaultMXPort;
 559         SendMsg->IO.Data        = SendMsg;
 560         SendMsg->IO.SendDone    = SMTP_C_DispatchWriteDone;
 561         SendMsg->IO.ReadDone    = SMTP_C_DispatchReadDone;
 562         SendMsg->IO.Terminate   = SMTP_C_Terminate;
 563         SendMsg->IO.LineReader  = SMTP_C_ReadServerStatus;
 564         SendMsg->IO.ConnFail    = SMTP_C_ConnFail;
 565         SendMsg->IO.Timeout     = SMTP_C_Timeout;
 566         SendMsg->IO.SendBuf.Buf = NewStrBufPlain(NULL, 1024);
 567         SendMsg->IO.RecvBuf.Buf = NewStrBufPlain(NULL, 1024);
 568         SendMsg->IO.IOBuf       = NewStrBuf();
 569
 570         if (KeepMsgText) {
 571                 SendMsg->msgtext    = MsgText;
 572         }
 573         else {
 574                 SendMsg->msgtext = NewStrBufDup(MsgText);
 575         }
 576
 577         if (smtp_resolve_recipients(SendMsg)) {
 578                 if (SendMsg->pCurrRelay == NULL)
 579                         QueueEventContext(&SendMsg->IO,
 580                                           resolve_mx_records);
 581                 else {
 582                         if (SendMsg->pCurrRelay->IsIP) {
 583                                 QueueEventContext(&SendMsg->IO,
 584                                                   mx_connect_relay_ip);
 585                         }
 586                         else {
 587                                 QueueEventContext(&SendMsg->IO,
 588                                                   get_one_mx_host_ip);
 589                         }
 590                 }
 591         }
 592         else {
 593                 if ((SendMsg==NULL) ||
 594                     (SendMsg->MyQEntry == NULL)) {
 595                         SendMsg->MyQEntry->Status = 5;
 596                         StrBufPlain(SendMsg->MyQEntry->StatusMessage,
 597                                     HKEY("Invalid Recipient!"));
 598                 }
 599                 FinalizeMessageSend(SendMsg);
 600         }
 601 }
 602
 603
 604
 605
 606
 607 /*****************************************************************************/
 608 /*                     SMTP CLIENT STATE CALLBACKS                           */
 609 /*****************************************************************************/
 610 eNextState SMTPC_read_greeting(SmtpOutMsg *SendMsg)
 611 {
 612         /* Process the SMTP greeting from the server */
 613         SMTP_DBG_READ();
 614
 615         if (!SMTP_IS_STATE('2')) {
 616                 if (SMTP_IS_STATE('4'))
 617                         SMTP_VERROR(4);
 618                 else
 619                         SMTP_VERROR(5);
 620         }
 621         return eSendReply;
 622 }
 623
 624 eNextState SMTPC_send_EHLO(SmtpOutMsg *SendMsg)
 625 {
 626         /* At this point we know we are talking to a real SMTP server */
 627
 628         /* Do a EHLO command.  If it fails, try the HELO command. */
 629         StrBufPrintf(SendMsg->IO.SendBuf.Buf,
 630                      "EHLO %s\r\n", config.c_fqdn);
 631
 632         SMTP_DBG_SEND();
 633         return eReadMessage;
 634 }
 635
 636 eNextState SMTPC_read_EHLO_reply(SmtpOutMsg *SendMsg)
 637 {
 638         SMTP_DBG_READ();
 639
 640         if (SMTP_IS_STATE('2')) {
 641                 SendMsg->State ++;
 642
 643                 if ((SendMsg->pCurrRelay == NULL) ||
 644                     (SendMsg->pCurrRelay->User == NULL))
 645                         SendMsg->State ++; /* Skip auth... */
 646         }
 647         /* else we fall back to 'helo' */
 648         return eSendReply;
 649 }
 650
 651 eNextState STMPC_send_HELO(SmtpOutMsg *SendMsg)
 652 {
 653         StrBufPrintf(SendMsg->IO.SendBuf.Buf,
 654                      "HELO %s\r\n", config.c_fqdn);
 655
 656         SMTP_DBG_SEND();
 657         return eReadMessage;
 658 }
 659
 660 eNextState SMTPC_read_HELO_reply(SmtpOutMsg *SendMsg)
 661 {
 662         SMTP_DBG_READ();
 663
 664         if (!SMTP_IS_STATE('2')) {
 665                 if (SMTP_IS_STATE('4'))
 666                         SMTP_VERROR(4);
 667                 else
 668                         SMTP_VERROR(5);
 669         }
 670                 if ((SendMsg->pCurrRelay == NULL) ||
 671                     (SendMsg->pCurrRelay->User == NULL))
 672                 SendMsg->State ++; /* Skip auth... */
 673         return eSendReply;
 674 }
 675
 676 eNextState SMTPC_send_auth(SmtpOutMsg *SendMsg)
 677 {
 678         char buf[SIZ];
 679         char encoded[1024];
 680
 681         if ((SendMsg->pCurrRelay == NULL) ||
 682             (SendMsg->pCurrRelay->User == NULL))
 683                 SendMsg->State ++; /* Skip auth, shouldn't even come here!... */
 684         else {
 685         /* Do an AUTH command if necessary */
 686         sprintf(buf, "%s%c%s%c%s",
 687                 SendMsg->pCurrRelay->User, '\0',
 688                 SendMsg->pCurrRelay->User, '\0',
 689                 SendMsg->pCurrRelay->Pass);
 690         CtdlEncodeBase64(encoded, buf,
 691                          strlen(SendMsg->pCurrRelay->User) * 2 +
 692                          strlen(SendMsg->pCurrRelay->Pass) + 2, 0);
 693         StrBufPrintf(SendMsg->IO.SendBuf.Buf,
 694                      "AUTH PLAIN %s\r\n", encoded);
 695         }
 696         SMTP_DBG_SEND();
 697         return eReadMessage;
 698 }
 699
 700 eNextState SMTPC_read_auth_reply(SmtpOutMsg *SendMsg)
 701 {
 702         /* Do an AUTH command if necessary */
 703
 704         SMTP_DBG_READ();
 705
 706         if (!SMTP_IS_STATE('2')) {
 707                 if (SMTP_IS_STATE('4'))
 708                         SMTP_VERROR(4);
 709                 else
 710                         SMTP_VERROR(5);
 711         }
 712         return eSendReply;
 713 }
 714
 715 eNextState SMTPC_send_FROM(SmtpOutMsg *SendMsg)
 716 {
 717         /* previous command succeeded, now try the MAIL FROM: command */
 718         StrBufPrintf(SendMsg->IO.SendBuf.Buf,
 719                      "MAIL FROM:<%s>\r\n",
 720                      SendMsg->envelope_from);
 721
 722         SMTP_DBG_SEND();
 723         return eReadMessage;
 724 }
 725
 726 eNextState SMTPC_read_FROM_reply(SmtpOutMsg *SendMsg)
 727 {
 728         SMTP_DBG_READ();
 729
 730         if (!SMTP_IS_STATE('2')) {
 731                 if (SMTP_IS_STATE('4'))
 732                         SMTP_VERROR(4);
 733                 else
 734                         SMTP_VERROR(5);
 735         }
 736         return eSendReply;
 737 }
 738
 739
 740 eNextState SMTPC_send_RCPT(SmtpOutMsg *SendMsg)
 741 {
 742         /* MAIL succeeded, now try the RCPT To: command */
 743         StrBufPrintf(SendMsg->IO.SendBuf.Buf,
 744                      "RCPT TO:<%s@%s>\r\n",
 745                      SendMsg->user,
 746                      SendMsg->node);
 747
 748         SMTP_DBG_SEND();
 749         return eReadMessage;
 750 }
 751
 752 eNextState SMTPC_read_RCPT_reply(SmtpOutMsg *SendMsg)
 753 {
 754         SMTP_DBG_READ();
 755
 756         if (!SMTP_IS_STATE('2')) {
 757                 if (SMTP_IS_STATE('4'))
 758                         SMTP_VERROR(4);
 759                 else
 760                         SMTP_VERROR(5);
 761         }
 762         return eSendReply;
 763 }
 764
 765 eNextState SMTPC_send_DATAcmd(SmtpOutMsg *SendMsg)
 766 {
 767         /* RCPT succeeded, now try the DATA command */
 768         StrBufPlain(SendMsg->IO.SendBuf.Buf,
 769                     HKEY("DATA\r\n"));
 770
 771         SMTP_DBG_SEND();
 772         return eReadMessage;
 773 }
 774
 775 eNextState SMTPC_read_DATAcmd_reply(SmtpOutMsg *SendMsg)
 776 {
 777         SMTP_DBG_READ();
 778
 779         if (!SMTP_IS_STATE('3')) {
 780                 if (SMTP_IS_STATE('4'))
 781                         SMTP_VERROR(3);
 782                 else
 783                         SMTP_VERROR(5);
 784         }
 785         return eSendReply;
 786 }
 787
 788 eNextState SMTPC_send_data_body(SmtpOutMsg *SendMsg)
 789 {
 790         StrBuf *Buf;
 791         /* If we reach this point, the server is expecting data.*/
 792
 793         Buf = SendMsg->IO.SendBuf.Buf;
 794         SendMsg->IO.SendBuf.Buf = SendMsg->msgtext;
 795         SendMsg->msgtext = Buf;
 796         SendMsg->State ++;
 797
 798         return eSendMore;
 799 }
 800
 801 eNextState SMTPC_send_terminate_data_body(SmtpOutMsg *SendMsg)
 802 {
 803         StrBuf *Buf;
 804
 805         Buf = SendMsg->IO.SendBuf.Buf;
 806         SendMsg->IO.SendBuf.Buf = SendMsg->msgtext;
 807         SendMsg->msgtext = Buf;
 808
 809         StrBufPlain(SendMsg->IO.SendBuf.Buf,
 810                     HKEY(".\r\n"));
 811
 812         return eReadMessage;
 813
 814 }
 815
 816 eNextState SMTPC_read_data_body_reply(SmtpOutMsg *SendMsg)
 817 {
 818         SMTP_DBG_READ();
 819
 820         if (!SMTP_IS_STATE('2')) {
 821                 if (SMTP_IS_STATE('4'))
 822                         SMTP_VERROR(4);
 823                 else
 824                         SMTP_VERROR(5);
 825         }
 826
 827         /* We did it! */
 828         StrBufPlain(SendMsg->MyQEntry->StatusMessage,
 829                     &ChrPtr(SendMsg->IO.RecvBuf.Buf)[4],
 830                     StrLength(SendMsg->IO.RecvBuf.Buf) - 4);
 831         SendMsg->MyQEntry->Status = 2;
 832         return eSendReply;
 833 }
 834
 835 eNextState SMTPC_send_QUIT(SmtpOutMsg *SendMsg)
 836 {
 837         StrBufPlain(SendMsg->IO.SendBuf.Buf,
 838                     HKEY("QUIT\r\n"));
 839
 840         SMTP_DBG_SEND();
 841         return eReadMessage;
 842 }
 843
 844 eNextState SMTPC_read_QUIT_reply(SmtpOutMsg *SendMsg)
 845 {
 846         SMTP_DBG_READ();
 847
 848         CtdlLogPrintf(CTDL_INFO, "SMTP client[%ld]: delivery to <%s> @ <%s> (%s) succeeded\n",
 849                       SendMsg->n, SendMsg->user, SendMsg->node, SendMsg->name);
 850         return eTerminateConnection;
 851 }
 852
 853 eNextState SMTPC_read_dummy(SmtpOutMsg *SendMsg)
 854 {
 855         return eSendReply;
 856 }
 857
 858 eNextState SMTPC_send_dummy(SmtpOutMsg *SendMsg)
 859 {
 860         return eReadMessage;
 861 }
 862
 863
 864 /*****************************************************************************/
 865 /*                     SMTP CLIENT DISPATCHER                                */
 866 /*****************************************************************************/
 867 SMTPReadHandler ReadHandlers[eMaxSMTPC] = {
 868         SMTPC_read_greeting,
 869         SMTPC_read_EHLO_reply,
 870         SMTPC_read_HELO_reply,
 871         SMTPC_read_auth_reply,
 872         SMTPC_read_FROM_reply,
 873         SMTPC_read_RCPT_reply,
 874         SMTPC_read_DATAcmd_reply,
 875         SMTPC_read_dummy,
 876         SMTPC_read_data_body_reply,
 877         SMTPC_read_QUIT_reply
 878 };
 879 SMTPSendHandler SendHandlers[eMaxSMTPC] = {
 880         SMTPC_send_dummy, /* we don't send a greeting, the server does... */
 881         SMTPC_send_EHLO,
 882         STMPC_send_HELO,
 883         SMTPC_send_auth,
 884         SMTPC_send_FROM,
 885         SMTPC_send_RCPT,
 886         SMTPC_send_DATAcmd,
 887         SMTPC_send_data_body,
 888         SMTPC_send_terminate_data_body,
 889         SMTPC_send_QUIT
 890 };
 891
 892 void SMTPSetTimeout(eNextState NextTCPState, SmtpOutMsg *pMsg)
 893 {
 894         CtdlLogPrintf(CTDL_DEBUG, "SMTP: %s\n", __FUNCTION__);
 895         double Timeout;
 896         switch (NextTCPState) {
 897         case eSendReply:
 898         case eSendMore:
 899                 Timeout = SMTP_C_SendTimeouts[pMsg->State];
 900                 if (pMsg->State == eDATABody) {
 901                         /* if we're sending a huge message, we need more time. */
 902                         Timeout += StrLength(pMsg->msgtext) / 1024;
 903                 }
 904                 break;
 905         case eReadMessage:
 906                 Timeout = SMTP_C_ReadTimeouts[pMsg->State];
 907                 if (pMsg->State == eDATATerminateBody) {
 908                         /*
 909                          * some mailservers take a nap before accepting the message
 910                          * content inspection and such.
 911                          */
 912                         Timeout += StrLength(pMsg->msgtext) / 1024;
 913                 }
 914                 break;
 915         case eTerminateConnection:
 916         case eAbort:
 917                 return;
 918         }
 919         SetNextTimeout(&pMsg->IO, Timeout);
 920 }
 921 eNextState SMTP_C_DispatchReadDone(AsyncIO *IO)
 922 {
 923         CtdlLogPrintf(CTDL_DEBUG, "SMTP: %s\n", __FUNCTION__);
 924         SmtpOutMsg *pMsg = IO->Data;
 925         eNextState rc;
 926
 927         rc = ReadHandlers[pMsg->State](pMsg);
 928         pMsg->State++;
 929         SMTPSetTimeout(rc, pMsg);
 930         return rc;
 931 }
 932 eNextState SMTP_C_DispatchWriteDone(AsyncIO *IO)
 933 {
 934         CtdlLogPrintf(CTDL_DEBUG, "SMTP: %s\n", __FUNCTION__);
 935         SmtpOutMsg *pMsg = IO->Data;
 936         eNextState rc;
 937
 938         rc = SendHandlers[pMsg->State](pMsg);
 939         SMTPSetTimeout(rc, pMsg);
 940         return rc;
 941 }
 942
 943
 944 /*****************************************************************************/
 945 /*                     SMTP CLIENT ERROR CATCHERS                            */
 946 /*****************************************************************************/
 947 eNextState SMTP_C_Terminate(AsyncIO *IO)
 948 {
 949         CtdlLogPrintf(CTDL_DEBUG, "SMTP: %s\n", __FUNCTION__);
 950         SmtpOutMsg *pMsg = IO->Data;
 951         FinalizeMessageSend(pMsg);
 952         return eAbort;
 953 }
 954 eNextState SMTP_C_Timeout(AsyncIO *IO)
 955 {
 956         CtdlLogPrintf(CTDL_DEBUG, "SMTP: %s\n", __FUNCTION__);
 957         SmtpOutMsg *pMsg = IO->Data;
 958         StrBufPlain(IO->ErrMsg, CKEY(ReadErrors[pMsg->State]));
 959         FinalizeMessageSend(pMsg);
 960         return eAbort;
 961 }
 962 eNextState SMTP_C_ConnFail(AsyncIO *IO)
 963 {
 964         CtdlLogPrintf(CTDL_DEBUG, "SMTP: %s\n", __FUNCTION__);
 965         SmtpOutMsg *pMsg = IO->Data;
 966         FinalizeMessageSend(pMsg);
 967         return eAbort;
 968 }
 969
 970
 971 /**
 972  * @brief lineread Handler; understands when to read more SMTP lines, and when this is a one-lined reply.
 973  */
 974 eReadState SMTP_C_ReadServerStatus(AsyncIO *IO)
 975 {
 976         eReadState Finished = eBufferNotEmpty;
 977
 978         while (Finished == eBufferNotEmpty) {
 979                 Finished = StrBufChunkSipLine(IO->IOBuf, &IO->RecvBuf);
 980
 981                 switch (Finished) {
 982                 case eMustReadMore: /// read new from socket...
 983                         return Finished;
 984                         break;
 985                 case eBufferNotEmpty: /* shouldn't happen... */
 986                 case eReadSuccess: /// done for now...
 987                         if (StrLength(IO->IOBuf) < 4)
 988                                 continue;
 989                         if (ChrPtr(IO->IOBuf)[3] == '-')
 990                                 Finished = eBufferNotEmpty;
 991                         else
 992                                 return Finished;
 993                         break;
 994                 case eReadFail: /// WHUT?
 995                         ///todo: shut down!
 996                         break;
 997                 }
 998         }
 999         return Finished;
1000 }
1001
1002 #endif
1003 CTDL_MODULE_INIT(smtp_eventclient)
1004 {
1005         return "smtpeventclient";
1006 }