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 in6_addr));
 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         CtdlLogPrintf(CTDL_DEBUG, "SMTP: %s\n", __FUNCTION__);
 425
 426         SendMsg->IO.ErrMsg = SendMsg->MyQEntry->StatusMessage;
 427
 428         SendMsg->CurrMX = SendMsg->AllMX = IO->VParsedDNSReply;
 429         //// TODO: should we remove the current ares context???
 430         get_one_mx_host_ip(IO);
 431         return IO->NextState;
 432 }
 433
 434
 435 eNextState resolve_mx_records(AsyncIO *IO)
 436 {
 437         SmtpOutMsg * SendMsg = IO->Data;
 438
 439         CtdlLogPrintf(CTDL_DEBUG, "SMTP: %s\n", __FUNCTION__);
 440
 441         if (!QueueQuery(ns_t_mx,
 442                         SendMsg->node,
 443                         &SendMsg->IO,
 444                         smtp_resolve_mx_done))
 445         {
 446                 SendMsg->MyQEntry->Status = 5;
 447                 StrBufPrintf(SendMsg->MyQEntry->StatusMessage,
 448                              "No MX hosts found for <%s>", SendMsg->node);
 449                 return IO->NextState;
 450         }
 451         return eAbort;
 452 }
 453
 454
 455 int smtp_resolve_recipients(SmtpOutMsg *SendMsg)
 456 {
 457         const char *ptr;
 458         char buf[1024];
 459         int scan_done;
 460         int lp, rp;
 461         int i;
 462
 463         CtdlLogPrintf(CTDL_DEBUG, "SMTP: %s\n", __FUNCTION__);
 464
 465         if ((SendMsg==NULL) ||
 466             (SendMsg->MyQEntry == NULL) ||
 467             (StrLength(SendMsg->MyQEntry->Recipient) == 0)) {
 468                 return 0;
 469         }
 470
 471         /* Parse out the host portion of the recipient address */
 472         process_rfc822_addr(ChrPtr(SendMsg->MyQEntry->Recipient),
 473                             SendMsg->user,
 474                             SendMsg->node,
 475                             SendMsg->name);
 476
 477         CtdlLogPrintf(CTDL_DEBUG, "SMTP client[%ld]: Attempting delivery to <%s> @ <%s> (%s)\n",
 478                       SendMsg->n, SendMsg->user, SendMsg->node, SendMsg->name);
 479         /* If no envelope_from is supplied, extract one from the message */
 480         if ( (SendMsg->envelope_from == NULL) ||
 481              (IsEmptyStr(SendMsg->envelope_from)) ) {
 482                 SendMsg->mailfrom[0] = '\0';
 483                 scan_done = 0;
 484                 ptr = ChrPtr(SendMsg->msgtext);
 485                 do {
 486                         if (ptr = cmemreadline(ptr, buf, sizeof buf), *ptr == 0) {
 487                                 scan_done = 1;
 488                         }
 489                         if (!strncasecmp(buf, "From:", 5)) {
 490                                 safestrncpy(SendMsg->mailfrom, &buf[5], sizeof SendMsg->mailfrom);
 491                                 striplt(SendMsg->mailfrom);
 492                                 for (i=0; SendMsg->mailfrom[i]; ++i) {
 493                                         if (!isprint(SendMsg->mailfrom[i])) {
 494                                                 strcpy(&SendMsg->mailfrom[i], &SendMsg->mailfrom[i+1]);
 495                                                 i=0;
 496                                         }
 497                                 }
 498
 499                                 /* Strip out parenthesized names */
 500                                 lp = (-1);
 501                                 rp = (-1);
 502                                 for (i=0; !IsEmptyStr(SendMsg->mailfrom + i); ++i) {
 503                                         if (SendMsg->mailfrom[i] == '(') lp = i;
 504                                         if (SendMsg->mailfrom[i] == ')') rp = i;
 505                                 }
 506                                 if ((lp>0)&&(rp>lp)) {
 507                                         strcpy(&SendMsg->mailfrom[lp-1], &SendMsg->mailfrom[rp+1]);
 508                                 }
 509
 510                                 /* Prefer brokketized names */
 511                                 lp = (-1);
 512                                 rp = (-1);
 513                                 for (i=0; !IsEmptyStr(SendMsg->mailfrom + i); ++i) {
 514                                         if (SendMsg->mailfrom[i] == '<') lp = i;
 515                                         if (SendMsg->mailfrom[i] == '>') rp = i;
 516                                 }
 517                                 if ( (lp>=0) && (rp>lp) ) {
 518                                         SendMsg->mailfrom[rp] = 0;
 519                                         memmove(SendMsg->mailfrom,
 520                                                 &SendMsg->mailfrom[lp + 1],
 521                                                 rp - lp);
 522                                 }
 523
 524                                 scan_done = 1;
 525                         }
 526                 } while (scan_done == 0);
 527                 if (IsEmptyStr(SendMsg->mailfrom)) strcpy(SendMsg->mailfrom, "someone@somewhere.org");
 528                 stripallbut(SendMsg->mailfrom, '<', '>');
 529                 SendMsg->envelope_from = SendMsg->mailfrom;
 530         }
 531
 532         return 1;
 533 }
 534
 535
 536
 537 void smtp_try(OneQueItem *MyQItem,
 538               MailQEntry *MyQEntry,
 539               StrBuf *MsgText,
 540               int KeepMsgText,  /* KeepMsgText allows us to use MsgText as ours. */
 541               int MsgCount)
 542 {
 543         SmtpOutMsg * SendMsg;
 544
 545         CtdlLogPrintf(CTDL_DEBUG, "SMTP: %s\n", __FUNCTION__);
 546
 547         SendMsg = (SmtpOutMsg *) malloc(sizeof(SmtpOutMsg));
 548         memset(SendMsg, 0, sizeof(SmtpOutMsg));
 549         SendMsg->IO.sock      = (-1);
 550         SendMsg->IO.NextState = eReadMessage;
 551         SendMsg->n            = MsgCount++;
 552         SendMsg->MyQEntry     = MyQEntry;
 553         SendMsg->MyQItem      = MyQItem;
 554         SendMsg->pCurrRelay   = MyQItem->URL;
 555
 556         SendMsg->IO.dport       = DefaultMXPort;
 557         SendMsg->IO.Data        = SendMsg;
 558         SendMsg->IO.SendDone    = SMTP_C_DispatchWriteDone;
 559         SendMsg->IO.ReadDone    = SMTP_C_DispatchReadDone;
 560         SendMsg->IO.Terminate   = SMTP_C_Terminate;
 561         SendMsg->IO.LineReader  = SMTP_C_ReadServerStatus;
 562         SendMsg->IO.ConnFail    = SMTP_C_ConnFail;
 563         SendMsg->IO.Timeout     = SMTP_C_Timeout;
 564         SendMsg->IO.SendBuf.Buf = NewStrBufPlain(NULL, 1024);
 565         SendMsg->IO.RecvBuf.Buf = NewStrBufPlain(NULL, 1024);
 566         SendMsg->IO.IOBuf       = NewStrBuf();
 567
 568         if (KeepMsgText) {
 569                 SendMsg->msgtext    = MsgText;
 570         }
 571         else {
 572                 SendMsg->msgtext = NewStrBufDup(MsgText);
 573         }
 574
 575         if (smtp_resolve_recipients(SendMsg)) {
 576                 if (SendMsg->pCurrRelay == NULL)
 577                         QueueEventContext(&SendMsg->IO,
 578                                           resolve_mx_records);
 579                 else {
 580                         if (SendMsg->pCurrRelay->IsIP) {
 581                                 QueueEventContext(&SendMsg->IO,
 582                                                   mx_connect_relay_ip);
 583                         }
 584                         else {
 585                                 QueueEventContext(&SendMsg->IO,
 586                                                   get_one_mx_host_ip);
 587                         }
 588                 }
 589         }
 590         else {
 591                 if ((SendMsg==NULL) ||
 592                     (SendMsg->MyQEntry == NULL)) {
 593                         SendMsg->MyQEntry->Status = 5;
 594                         StrBufPlain(SendMsg->MyQEntry->StatusMessage,
 595                                     HKEY("Invalid Recipient!"));
 596                 }
 597                 FinalizeMessageSend(SendMsg);
 598         }
 599 }
 600
 601
 602
 603
 604
 605 /*****************************************************************************/
 606 /*                     SMTP CLIENT STATE CALLBACKS                           */
 607 /*****************************************************************************/
 608 eNextState SMTPC_read_greeting(SmtpOutMsg *SendMsg)
 609 {
 610         /* Process the SMTP greeting from the server */
 611         SMTP_DBG_READ();
 612
 613         if (!SMTP_IS_STATE('2')) {
 614                 if (SMTP_IS_STATE('4'))
 615                         SMTP_VERROR(4);
 616                 else
 617                         SMTP_VERROR(5);
 618         }
 619         return eSendReply;
 620 }
 621
 622 eNextState SMTPC_send_EHLO(SmtpOutMsg *SendMsg)
 623 {
 624         /* At this point we know we are talking to a real SMTP server */
 625
 626         /* Do a EHLO command.  If it fails, try the HELO command. */
 627         StrBufPrintf(SendMsg->IO.SendBuf.Buf,
 628                      "EHLO %s\r\n", config.c_fqdn);
 629
 630         SMTP_DBG_SEND();
 631         return eReadMessage;
 632 }
 633
 634 eNextState SMTPC_read_EHLO_reply(SmtpOutMsg *SendMsg)
 635 {
 636         SMTP_DBG_READ();
 637
 638         if (SMTP_IS_STATE('2')) {
 639                 SendMsg->State ++;
 640
 641                 if ((SendMsg->pCurrRelay == NULL) ||
 642                     (SendMsg->pCurrRelay->User == NULL))
 643                         SendMsg->State ++; /* Skip auth... */
 644         }
 645         /* else we fall back to 'helo' */
 646         return eSendReply;
 647 }
 648
 649 eNextState STMPC_send_HELO(SmtpOutMsg *SendMsg)
 650 {
 651         StrBufPrintf(SendMsg->IO.SendBuf.Buf,
 652                      "HELO %s\r\n", config.c_fqdn);
 653
 654         SMTP_DBG_SEND();
 655         return eReadMessage;
 656 }
 657
 658 eNextState SMTPC_read_HELO_reply(SmtpOutMsg *SendMsg)
 659 {
 660         SMTP_DBG_READ();
 661
 662         if (!SMTP_IS_STATE('2')) {
 663                 if (SMTP_IS_STATE('4'))
 664                         SMTP_VERROR(4);
 665                 else
 666                         SMTP_VERROR(5);
 667         }
 668                 if ((SendMsg->pCurrRelay == NULL) ||
 669                     (SendMsg->pCurrRelay->User == NULL))
 670                 SendMsg->State ++; /* Skip auth... */
 671         return eSendReply;
 672 }
 673
 674 eNextState SMTPC_send_auth(SmtpOutMsg *SendMsg)
 675 {
 676         char buf[SIZ];
 677         char encoded[1024];
 678
 679         if ((SendMsg->pCurrRelay == NULL) ||
 680             (SendMsg->pCurrRelay->User == NULL))
 681                 SendMsg->State ++; /* Skip auth, shouldn't even come here!... */
 682         else {
 683         /* Do an AUTH command if necessary */
 684         sprintf(buf, "%s%c%s%c%s",
 685                 SendMsg->pCurrRelay->User, '\0',
 686                 SendMsg->pCurrRelay->User, '\0',
 687                 SendMsg->pCurrRelay->Pass);
 688         CtdlEncodeBase64(encoded, buf,
 689                          strlen(SendMsg->pCurrRelay->User) * 2 +
 690                          strlen(SendMsg->pCurrRelay->Pass) + 2, 0);
 691         StrBufPrintf(SendMsg->IO.SendBuf.Buf,
 692                      "AUTH PLAIN %s\r\n", encoded);
 693         }
 694         SMTP_DBG_SEND();
 695         return eReadMessage;
 696 }
 697
 698 eNextState SMTPC_read_auth_reply(SmtpOutMsg *SendMsg)
 699 {
 700         /* Do an AUTH command if necessary */
 701
 702         SMTP_DBG_READ();
 703
 704         if (!SMTP_IS_STATE('2')) {
 705                 if (SMTP_IS_STATE('4'))
 706                         SMTP_VERROR(4);
 707                 else
 708                         SMTP_VERROR(5);
 709         }
 710         return eSendReply;
 711 }
 712
 713 eNextState SMTPC_send_FROM(SmtpOutMsg *SendMsg)
 714 {
 715         /* previous command succeeded, now try the MAIL FROM: command */
 716         StrBufPrintf(SendMsg->IO.SendBuf.Buf,
 717                      "MAIL FROM:<%s>\r\n",
 718                      SendMsg->envelope_from);
 719
 720         SMTP_DBG_SEND();
 721         return eReadMessage;
 722 }
 723
 724 eNextState SMTPC_read_FROM_reply(SmtpOutMsg *SendMsg)
 725 {
 726         SMTP_DBG_READ();
 727
 728         if (!SMTP_IS_STATE('2')) {
 729                 if (SMTP_IS_STATE('4'))
 730                         SMTP_VERROR(4);
 731                 else
 732                         SMTP_VERROR(5);
 733         }
 734         return eSendReply;
 735 }
 736
 737
 738 eNextState SMTPC_send_RCPT(SmtpOutMsg *SendMsg)
 739 {
 740         /* MAIL succeeded, now try the RCPT To: command */
 741         StrBufPrintf(SendMsg->IO.SendBuf.Buf,
 742                      "RCPT TO:<%s@%s>\r\n",
 743                      SendMsg->user,
 744                      SendMsg->node);
 745
 746         SMTP_DBG_SEND();
 747         return eReadMessage;
 748 }
 749
 750 eNextState SMTPC_read_RCPT_reply(SmtpOutMsg *SendMsg)
 751 {
 752         SMTP_DBG_READ();
 753
 754         if (!SMTP_IS_STATE('2')) {
 755                 if (SMTP_IS_STATE('4'))
 756                         SMTP_VERROR(4);
 757                 else
 758                         SMTP_VERROR(5);
 759         }
 760         return eSendReply;
 761 }
 762
 763 eNextState SMTPC_send_DATAcmd(SmtpOutMsg *SendMsg)
 764 {
 765         /* RCPT succeeded, now try the DATA command */
 766         StrBufPlain(SendMsg->IO.SendBuf.Buf,
 767                     HKEY("DATA\r\n"));
 768
 769         SMTP_DBG_SEND();
 770         return eReadMessage;
 771 }
 772
 773 eNextState SMTPC_read_DATAcmd_reply(SmtpOutMsg *SendMsg)
 774 {
 775         SMTP_DBG_READ();
 776
 777         if (!SMTP_IS_STATE('3')) {
 778                 if (SMTP_IS_STATE('4'))
 779                         SMTP_VERROR(3);
 780                 else
 781                         SMTP_VERROR(5);
 782         }
 783         return eSendReply;
 784 }
 785
 786 eNextState SMTPC_send_data_body(SmtpOutMsg *SendMsg)
 787 {
 788         StrBuf *Buf;
 789         /* If we reach this point, the server is expecting data.*/
 790
 791         Buf = SendMsg->IO.SendBuf.Buf;
 792         SendMsg->IO.SendBuf.Buf = SendMsg->msgtext;
 793         SendMsg->msgtext = Buf;
 794         SendMsg->State ++;
 795
 796         return eSendMore;
 797 }
 798
 799 eNextState SMTPC_send_terminate_data_body(SmtpOutMsg *SendMsg)
 800 {
 801         StrBuf *Buf;
 802
 803         Buf = SendMsg->IO.SendBuf.Buf;
 804         SendMsg->IO.SendBuf.Buf = SendMsg->msgtext;
 805         SendMsg->msgtext = Buf;
 806
 807         StrBufPlain(SendMsg->IO.SendBuf.Buf,
 808                     HKEY(".\r\n"));
 809
 810         return eReadMessage;
 811
 812 }
 813
 814 eNextState SMTPC_read_data_body_reply(SmtpOutMsg *SendMsg)
 815 {
 816         SMTP_DBG_READ();
 817
 818         if (!SMTP_IS_STATE('2')) {
 819                 if (SMTP_IS_STATE('4'))
 820                         SMTP_VERROR(4);
 821                 else
 822                         SMTP_VERROR(5);
 823         }
 824
 825         /* We did it! */
 826         StrBufPlain(SendMsg->MyQEntry->StatusMessage,
 827                     &ChrPtr(SendMsg->IO.RecvBuf.Buf)[4],
 828                     StrLength(SendMsg->IO.RecvBuf.Buf) - 4);
 829         SendMsg->MyQEntry->Status = 2;
 830         return eSendReply;
 831 }
 832
 833 eNextState SMTPC_send_QUIT(SmtpOutMsg *SendMsg)
 834 {
 835         StrBufPlain(SendMsg->IO.SendBuf.Buf,
 836                     HKEY("QUIT\r\n"));
 837
 838         SMTP_DBG_SEND();
 839         return eReadMessage;
 840 }
 841
 842 eNextState SMTPC_read_QUIT_reply(SmtpOutMsg *SendMsg)
 843 {
 844         SMTP_DBG_READ();
 845
 846         CtdlLogPrintf(CTDL_INFO, "SMTP client[%ld]: delivery to <%s> @ <%s> (%s) succeeded\n",
 847                       SendMsg->n, SendMsg->user, SendMsg->node, SendMsg->name);
 848         return eTerminateConnection;
 849 }
 850
 851 eNextState SMTPC_read_dummy(SmtpOutMsg *SendMsg)
 852 {
 853         return eSendReply;
 854 }
 855
 856 eNextState SMTPC_send_dummy(SmtpOutMsg *SendMsg)
 857 {
 858         return eReadMessage;
 859 }
 860
 861
 862 /*****************************************************************************/
 863 /*                     SMTP CLIENT DISPATCHER                                */
 864 /*****************************************************************************/
 865 SMTPReadHandler ReadHandlers[eMaxSMTPC] = {
 866         SMTPC_read_greeting,
 867         SMTPC_read_EHLO_reply,
 868         SMTPC_read_HELO_reply,
 869         SMTPC_read_auth_reply,
 870         SMTPC_read_FROM_reply,
 871         SMTPC_read_RCPT_reply,
 872         SMTPC_read_DATAcmd_reply,
 873         SMTPC_read_dummy,
 874         SMTPC_read_data_body_reply,
 875         SMTPC_read_QUIT_reply
 876 };
 877 SMTPSendHandler SendHandlers[eMaxSMTPC] = {
 878         SMTPC_send_dummy, /* we don't send a greeting, the server does... */
 879         SMTPC_send_EHLO,
 880         STMPC_send_HELO,
 881         SMTPC_send_auth,
 882         SMTPC_send_FROM,
 883         SMTPC_send_RCPT,
 884         SMTPC_send_DATAcmd,
 885         SMTPC_send_data_body,
 886         SMTPC_send_terminate_data_body,
 887         SMTPC_send_QUIT
 888 };
 889
 890 void SMTPSetTimeout(eNextState NextTCPState, SmtpOutMsg *pMsg)
 891 {
 892         CtdlLogPrintf(CTDL_DEBUG, "SMTP: %s\n", __FUNCTION__);
 893         double Timeout;
 894         switch (NextTCPState) {
 895         case eSendReply:
 896         case eSendMore:
 897                 Timeout = SMTP_C_SendTimeouts[pMsg->State];
 898                 if (pMsg->State == eDATABody) {
 899                         /* if we're sending a huge message, we need more time. */
 900                         Timeout += StrLength(pMsg->msgtext) / 1024;
 901                 }
 902                 break;
 903         case eReadMessage:
 904                 Timeout = SMTP_C_ReadTimeouts[pMsg->State];
 905                 if (pMsg->State == eDATATerminateBody) {
 906                         /*
 907                          * some mailservers take a nap before accepting the message
 908                          * content inspection and such.
 909                          */
 910                         Timeout += StrLength(pMsg->msgtext) / 1024;
 911                 }
 912                 break;
 913         case eTerminateConnection:
 914         case eAbort:
 915                 return;
 916         }
 917         SetNextTimeout(&pMsg->IO, Timeout);
 918 }
 919 eNextState SMTP_C_DispatchReadDone(AsyncIO *IO)
 920 {
 921         CtdlLogPrintf(CTDL_DEBUG, "SMTP: %s\n", __FUNCTION__);
 922         SmtpOutMsg *pMsg = IO->Data;
 923         eNextState rc;
 924
 925         rc = ReadHandlers[pMsg->State](pMsg);
 926         pMsg->State++;
 927         SMTPSetTimeout(rc, pMsg);
 928         return rc;
 929 }
 930 eNextState SMTP_C_DispatchWriteDone(AsyncIO *IO)
 931 {
 932         CtdlLogPrintf(CTDL_DEBUG, "SMTP: %s\n", __FUNCTION__);
 933         SmtpOutMsg *pMsg = IO->Data;
 934         eNextState rc;
 935
 936         rc = SendHandlers[pMsg->State](pMsg);
 937         SMTPSetTimeout(rc, pMsg);
 938         return rc;
 939 }
 940
 941
 942 /*****************************************************************************/
 943 /*                     SMTP CLIENT ERROR CATCHERS                            */
 944 /*****************************************************************************/
 945 eNextState SMTP_C_Terminate(AsyncIO *IO)
 946 {
 947         CtdlLogPrintf(CTDL_DEBUG, "SMTP: %s\n", __FUNCTION__);
 948         SmtpOutMsg *pMsg = IO->Data;
 949         FinalizeMessageSend(pMsg);
 950         return eAbort;
 951 }
 952 eNextState SMTP_C_Timeout(AsyncIO *IO)
 953 {
 954         CtdlLogPrintf(CTDL_DEBUG, "SMTP: %s\n", __FUNCTION__);
 955         SmtpOutMsg *pMsg = IO->Data;
 956         StrBufPlain(IO->ErrMsg, CKEY(ReadErrors[pMsg->State]));
 957         FinalizeMessageSend(pMsg);
 958         return eAbort;
 959 }
 960 eNextState SMTP_C_ConnFail(AsyncIO *IO)
 961 {
 962         CtdlLogPrintf(CTDL_DEBUG, "SMTP: %s\n", __FUNCTION__);
 963         SmtpOutMsg *pMsg = IO->Data;
 964         FinalizeMessageSend(pMsg);
 965         return eAbort;
 966 }
 967
 968
 969 /**
 970  * @brief lineread Handler; understands when to read more SMTP lines, and when this is a one-lined reply.
 971  */
 972 eReadState SMTP_C_ReadServerStatus(AsyncIO *IO)
 973 {
 974         eReadState Finished = eBufferNotEmpty;
 975
 976         while (Finished == eBufferNotEmpty) {
 977                 Finished = StrBufChunkSipLine(IO->IOBuf, &IO->RecvBuf);
 978
 979                 switch (Finished) {
 980                 case eMustReadMore: /// read new from socket...
 981                         return Finished;
 982                         break;
 983                 case eBufferNotEmpty: /* shouldn't happen... */
 984                 case eReadSuccess: /// done for now...
 985                         if (StrLength(IO->IOBuf) < 4)
 986                                 continue;
 987                         if (ChrPtr(IO->IOBuf)[3] == '-')
 988                                 Finished = eBufferNotEmpty;
 989                         else
 990                                 return Finished;
 991                         break;
 992                 case eReadFail: /// WHUT?
 993                         ///todo: shut down!
 994                         break;
 995                 }
 996         }
 997         return Finished;
 998 }
 999
1000 #endif
1001 CTDL_MODULE_INIT(smtp_eventclient)
1002 {
1003         return "smtpeventclient";
1004 }