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 = 60.; /* 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.IOBuf))
 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
 259 eNextState mx_connect_relay_ip(AsyncIO *IO)
 260 {
 261
 262         SmtpOutMsg *SendMsg = IO->Data;
 263
 264         CtdlLogPrintf(CTDL_DEBUG, "SMTP: %s\n", __FUNCTION__);
 265
 266         IO->IP6 = SendMsg->pCurrRelay->af == AF_INET6;
 267
 268         if (SendMsg->pCurrRelay->Port != 0)
 269                 IO->dport = SendMsg->pCurrRelay->Port;
 270
 271         memset(&IO->Addr, 0, sizeof(struct in6_addr));
 272         if (IO->IP6) {
 273                 memcpy(&IO->Addr.sin6_addr.s6_addr,
 274                        &SendMsg->pCurrRelay->Addr,
 275                        sizeof(struct in6_addr));
 276
 277                 IO->Addr.sin6_family = AF_INET6;
 278                 IO->Addr.sin6_port = htons(IO->dport);
 279         }
 280         else {
 281                 struct sockaddr_in *addr = (struct sockaddr_in*) &IO->Addr;
 282                 /* Bypass the ns lookup result like this: IO->Addr.sin_addr.s_addr = inet_addr("127.0.0.1"); */
 283                 memcpy(&addr->sin_addr,
 284                        &SendMsg->pCurrRelay->Addr,
 285                        sizeof(struct in_addr));
 286
 287                 addr->sin_family = AF_INET;
 288                 addr->sin_port = htons(IO->dport);
 289         }
 290
 291
 292
 293 /*
 294
 295         SendMsg->pCurrRelay->
 296         if ((SendMsg->pCurrRelay != NULL) && (SendMsg->pCurrRelay->IsIP)) {
 297                 connect = 1;
 298
 299         }
 300                 unsigned long psaddr;
 301
 302
 303                 memcpy(&psaddr, hostent->h_addr_list[0], sizeof(psaddr));
 304                 psaddr = ntohl(psaddr);
 305
 306                 CtdlLogPrintf(CTDL_DEBUG,
 307                               "SMTP client[%ld]: connecting to %s [%ld.%ld.%ld.%ld:%d] ...\n",
 308                               SendMsg->n,
 309                               SendMsg->mx_host,
 310                               (psaddr >> 24) & 0xFF,
 311                               (psaddr >> 16) & 0xFF,
 312                               (psaddr >>  8) & 0xFF,
 313                               (psaddr >>  0) & 0xFF,
 314                               SendMsg->IO.dport);
 315
 316                 SendMsg->MyQEntry->Status = 5;
 317                 StrBufPrintf(SendMsg->MyQEntry->StatusMessage,
 318                              "Timeout while connecting %s [%ld.%ld.%ld.%ld:%d] ",
 319                              SendMsg->mx_host,
 320                              (psaddr >> 24) & 0xFF,
 321                              (psaddr >> 16) & 0xFF,
 322                              (psaddr >>  8) & 0xFF,
 323                              (psaddr >>  0) & 0xFF,
 324                              SendMsg->IO.dport);
 325
 326
 327         }
 328 */
 329         /// TODO: else fail!
 330         InitEventIO(IO, SendMsg,
 331                     SMTP_C_ConnTimeout,
 332                     SMTP_C_ReadTimeouts[0],
 333                             1);
 334 }
 335
 336 void get_one_mx_host_ip_done(void *Ctx,
 337                              int status,
 338                              int timeouts,
 339                              struct hostent *hostent)
 340 {
 341         AsyncIO *IO = (AsyncIO *) Ctx;
 342         SmtpOutMsg *SendMsg = IO->Data;
 343
 344         if ((status == ARES_SUCCESS) && (hostent != NULL) ) {
 345
 346                 IO->IP6 = hostent->h_addrtype == AF_INET6;
 347
 348                 memset(&IO->Addr, 0, sizeof(struct in6_addr));
 349                 if (IO->IP6) {
 350                         memcpy(&IO->Addr.sin6_addr.s6_addr,
 351                                IO->HEnt->h_addr_list[0],
 352                                sizeof(struct in6_addr));
 353
 354                         IO->Addr.sin6_family = hostent->h_addrtype;
 355                         IO->Addr.sin6_port = htons(IO->dport);
 356                 }
 357                 else {
 358                         struct sockaddr_in *addr = (struct sockaddr_in*) &IO->Addr;
 359                         /* Bypass the ns lookup result like this: IO->Addr.sin_addr.s_addr = inet_addr("127.0.0.1"); */
 360                         memcpy(&addr->sin_addr,
 361                                IO->HEnt->h_addr_list[0],
 362                                sizeof(struct in_addr));
 363
 364                         addr->sin_family = hostent->h_addrtype;
 365                         addr->sin_port = htons(IO->dport);
 366
 367                 }
 368                 SendMsg->IO.HEnt = hostent;
 369                 InitEventIO(IO, SendMsg,
 370                             SMTP_C_ConnTimeout,
 371                             SMTP_C_ReadTimeouts[0],
 372                             1);
 373         }
 374 }
 375
 376 const unsigned short DefaultMXPort = 25;
 377 eNextState get_one_mx_host_ip(AsyncIO *IO)
 378 {
 379         SmtpOutMsg * SendMsg = IO->Data;
 380
 381         //char *endpart;
 382         //char buf[SIZ];
 383
 384         CtdlLogPrintf(CTDL_DEBUG, "SMTP: %s\n", __FUNCTION__);
 385         SendMsg->IO.dport = DefaultMXPort;
 386
 387         SendMsg->mx_host = SendMsg->CurrMX->host;
 388         SendMsg->CurrMX = SendMsg->CurrMX->next;
 389
 390         CtdlLogPrintf(CTDL_DEBUG,
 391                       "SMTP client[%ld]: looking up %s : %d ...\n",
 392                       SendMsg->n,
 393                       SendMsg->mx_host,
 394                       SendMsg->IO.dport);
 395
 396         ares_gethostbyname(SendMsg->IO.DNSChannel,
 397                            SendMsg->mx_host,
 398                            AF_INET6, /* it falls back to ipv4 in doubt... */
 399                            get_one_mx_host_ip_done,
 400                            &SendMsg->IO);
 401 }
 402
 403
 404 eNextState smtp_resolve_mx_done(AsyncIO *IO)
 405 {
 406         SmtpOutMsg * SendMsg = IO->Data;
 407
 408         CtdlLogPrintf(CTDL_DEBUG, "SMTP: %s\n", __FUNCTION__);
 409
 410         SendMsg->IO.SendBuf.Buf = NewStrBufPlain(NULL, 1024);
 411         SendMsg->IO.RecvBuf.Buf = NewStrBufPlain(NULL, 1024);
 412         SendMsg->IO.IOBuf = NewStrBuf();
 413         SendMsg->IO.ErrMsg = SendMsg->MyQEntry->StatusMessage;
 414
 415         SendMsg->CurrMX = SendMsg->AllMX = IO->VParsedDNSReply;
 416         //// TODO: should we remove the current ares context???
 417         get_one_mx_host_ip(IO);
 418         return 0;
 419 }
 420
 421
 422 eNextState resolve_mx_records(AsyncIO *IO)
 423 {
 424         SmtpOutMsg * SendMsg = IO->Data;
 425
 426         CtdlLogPrintf(CTDL_DEBUG, "SMTP: %s\n", __FUNCTION__);
 427
 428         if (!QueueQuery(ns_t_mx,
 429                         SendMsg->node,
 430                         &SendMsg->IO,
 431                         smtp_resolve_mx_done))
 432         {
 433                 SendMsg->MyQEntry->Status = 5;
 434                 StrBufPrintf(SendMsg->MyQEntry->StatusMessage,
 435                              "No MX hosts found for <%s>", SendMsg->node);
 436                 return 0; ///////TODO: abort!
 437         }
 438         return 0;
 439 }
 440
 441
 442 int smtp_resolve_recipients(SmtpOutMsg *SendMsg)
 443 {
 444         const char *ptr;
 445         char buf[1024];
 446         int scan_done;
 447         int lp, rp;
 448         int i;
 449
 450         CtdlLogPrintf(CTDL_DEBUG, "SMTP: %s\n", __FUNCTION__);
 451
 452         if ((SendMsg==NULL) ||
 453             (SendMsg->MyQEntry == NULL) ||
 454             (StrLength(SendMsg->MyQEntry->Recipient) == 0)) {
 455                 return 0;
 456         }
 457
 458         /* Parse out the host portion of the recipient address */
 459         process_rfc822_addr(ChrPtr(SendMsg->MyQEntry->Recipient),
 460                             SendMsg->user,
 461                             SendMsg->node,
 462                             SendMsg->name);
 463
 464         CtdlLogPrintf(CTDL_DEBUG, "SMTP client[%ld]: Attempting delivery to <%s> @ <%s> (%s)\n",
 465                       SendMsg->n, SendMsg->user, SendMsg->node, SendMsg->name);
 466         /* If no envelope_from is supplied, extract one from the message */
 467         if ( (SendMsg->envelope_from == NULL) ||
 468              (IsEmptyStr(SendMsg->envelope_from)) ) {
 469                 SendMsg->mailfrom[0] = '\0';
 470                 scan_done = 0;
 471                 ptr = ChrPtr(SendMsg->msgtext);
 472                 do {
 473                         if (ptr = cmemreadline(ptr, buf, sizeof buf), *ptr == 0) {
 474                                 scan_done = 1;
 475                         }
 476                         if (!strncasecmp(buf, "From:", 5)) {
 477                                 safestrncpy(SendMsg->mailfrom, &buf[5], sizeof SendMsg->mailfrom);
 478                                 striplt(SendMsg->mailfrom);
 479                                 for (i=0; SendMsg->mailfrom[i]; ++i) {
 480                                         if (!isprint(SendMsg->mailfrom[i])) {
 481                                                 strcpy(&SendMsg->mailfrom[i], &SendMsg->mailfrom[i+1]);
 482                                                 i=0;
 483                                         }
 484                                 }
 485
 486                                 /* Strip out parenthesized names */
 487                                 lp = (-1);
 488                                 rp = (-1);
 489                                 for (i=0; !IsEmptyStr(SendMsg->mailfrom + i); ++i) {
 490                                         if (SendMsg->mailfrom[i] == '(') lp = i;
 491                                         if (SendMsg->mailfrom[i] == ')') rp = i;
 492                                 }
 493                                 if ((lp>0)&&(rp>lp)) {
 494                                         strcpy(&SendMsg->mailfrom[lp-1], &SendMsg->mailfrom[rp+1]);
 495                                 }
 496
 497                                 /* Prefer brokketized names */
 498                                 lp = (-1);
 499                                 rp = (-1);
 500                                 for (i=0; !IsEmptyStr(SendMsg->mailfrom + i); ++i) {
 501                                         if (SendMsg->mailfrom[i] == '<') lp = i;
 502                                         if (SendMsg->mailfrom[i] == '>') rp = i;
 503                                 }
 504                                 if ( (lp>=0) && (rp>lp) ) {
 505                                         SendMsg->mailfrom[rp] = 0;
 506                                         memmove(SendMsg->mailfrom,
 507                                                 &SendMsg->mailfrom[lp + 1],
 508                                                 rp - lp);
 509                                 }
 510
 511                                 scan_done = 1;
 512                         }
 513                 } while (scan_done == 0);
 514                 if (IsEmptyStr(SendMsg->mailfrom)) strcpy(SendMsg->mailfrom, "someone@somewhere.org");
 515                 stripallbut(SendMsg->mailfrom, '<', '>');
 516                 SendMsg->envelope_from = SendMsg->mailfrom;
 517         }
 518
 519         return 1;
 520 }
 521
 522
 523
 524 void smtp_try(OneQueItem *MyQItem,
 525               MailQEntry *MyQEntry,
 526               StrBuf *MsgText,
 527               int KeepMsgText,  /* KeepMsgText allows us to use MsgText as ours. */
 528               int MsgCount)
 529 {
 530         SmtpOutMsg * SendMsg;
 531
 532         CtdlLogPrintf(CTDL_DEBUG, "SMTP: %s\n", __FUNCTION__);
 533
 534         SendMsg = (SmtpOutMsg *) malloc(sizeof(SmtpOutMsg));
 535         memset(SendMsg, 0, sizeof(SmtpOutMsg));
 536         SendMsg->IO.sock    = (-1);
 537         SendMsg->n          = MsgCount++;
 538         SendMsg->MyQEntry   = MyQEntry;
 539         SendMsg->MyQItem    = MyQItem;
 540         SendMsg->pCurrRelay = MyQItem->URL;
 541
 542         SendMsg->IO.Data        = SendMsg;
 543         SendMsg->IO.SendDone    = SMTP_C_DispatchWriteDone;
 544         SendMsg->IO.ReadDone    = SMTP_C_DispatchReadDone;
 545         SendMsg->IO.Terminate   = SMTP_C_Terminate;
 546         SendMsg->IO.LineReader  = SMTP_C_ReadServerStatus;
 547         SendMsg->IO.ConnFail    = SMTP_C_ConnFail;
 548         SendMsg->IO.Timeout     = SMTP_C_Timeout;
 549
 550         if (KeepMsgText) {
 551                 SendMsg->msgtext    = MsgText;
 552         }
 553         else {
 554                 SendMsg->msgtext = NewStrBufDup(MsgText);
 555         }
 556
 557         if (smtp_resolve_recipients(SendMsg)) {
 558                 if (SendMsg->pCurrRelay == NULL)
 559                         QueueEventContext(&SendMsg->IO,
 560                                           resolve_mx_records);
 561                 else {
 562                         if (SendMsg->pCurrRelay->IsIP) {
 563                                 QueueEventContext(&SendMsg->IO,
 564                                                   mx_connect_relay_ip);
 565                         }
 566                         else {
 567                                 QueueEventContext(&SendMsg->IO,
 568                                                   get_one_mx_host_ip);
 569                         }
 570                 }
 571         }
 572         else {
 573                 if ((SendMsg==NULL) ||
 574                     (SendMsg->MyQEntry == NULL)) {
 575                         SendMsg->MyQEntry->Status = 5;
 576                         StrBufPlain(SendMsg->MyQEntry->StatusMessage,
 577                                     HKEY("Invalid Recipient!"));
 578                 }
 579                 FinalizeMessageSend(SendMsg);
 580         }
 581 }
 582
 583
 584
 585
 586
 587 /*****************************************************************************/
 588 /*                     SMTP CLIENT STATE CALLBACKS                           */
 589 /*****************************************************************************/
 590 eNextState SMTPC_read_greeting(SmtpOutMsg *SendMsg)
 591 {
 592         /* Process the SMTP greeting from the server */
 593         SMTP_DBG_READ();
 594
 595         if (!SMTP_IS_STATE('2')) {
 596                 if (SMTP_IS_STATE('4'))
 597                         SMTP_VERROR(4);
 598                 else
 599                         SMTP_VERROR(5);
 600         }
 601         return eSendReply;
 602 }
 603
 604 eNextState SMTPC_send_EHLO(SmtpOutMsg *SendMsg)
 605 {
 606         /* At this point we know we are talking to a real SMTP server */
 607
 608         /* Do a EHLO command.  If it fails, try the HELO command. */
 609         StrBufPrintf(SendMsg->IO.SendBuf.Buf,
 610                      "EHLO %s\r\n", config.c_fqdn);
 611
 612         SMTP_DBG_SEND();
 613         return eReadMessage;
 614 }
 615
 616 eNextState SMTPC_read_EHLO_reply(SmtpOutMsg *SendMsg)
 617 {
 618         SMTP_DBG_READ();
 619
 620         if (SMTP_IS_STATE('2')) {
 621                 SendMsg->State ++;
 622
 623                 if (SendMsg->pCurrRelay->User == NULL)
 624                         SendMsg->State ++; /* Skip auth... */
 625         }
 626         /* else we fall back to 'helo' */
 627         return eSendReply;
 628 }
 629
 630 eNextState STMPC_send_HELO(SmtpOutMsg *SendMsg)
 631 {
 632         StrBufPrintf(SendMsg->IO.SendBuf.Buf,
 633                      "HELO %s\r\n", config.c_fqdn);
 634
 635         SMTP_DBG_SEND();
 636         return eReadMessage;
 637 }
 638
 639 eNextState SMTPC_read_HELO_reply(SmtpOutMsg *SendMsg)
 640 {
 641         SMTP_DBG_READ();
 642
 643         if (!SMTP_IS_STATE('2')) {
 644                 if (SMTP_IS_STATE('4'))
 645                         SMTP_VERROR(4);
 646                 else
 647                         SMTP_VERROR(5);
 648         }
 649         if (SendMsg->pCurrRelay->User == NULL)
 650                 SendMsg->State ++; /* Skip auth... */
 651         return eSendReply;
 652 }
 653
 654 eNextState SMTPC_send_auth(SmtpOutMsg *SendMsg)
 655 {
 656         char buf[SIZ];
 657         char encoded[1024];
 658
 659         /* Do an AUTH command if necessary */
 660         sprintf(buf, "%s%c%s%c%s",
 661                 SendMsg->pCurrRelay->User, '\0',
 662                 SendMsg->pCurrRelay->User, '\0',
 663                 SendMsg->pCurrRelay->Pass);
 664         CtdlEncodeBase64(encoded, buf,
 665                          strlen(SendMsg->pCurrRelay->User) * 2 +
 666                          strlen(SendMsg->pCurrRelay->Pass) + 2, 0);
 667         StrBufPrintf(SendMsg->IO.SendBuf.Buf,
 668                      "AUTH PLAIN %s\r\n", encoded);
 669
 670         SMTP_DBG_SEND();
 671         return eReadMessage;
 672 }
 673
 674 eNextState SMTPC_read_auth_reply(SmtpOutMsg *SendMsg)
 675 {
 676         /* Do an AUTH command if necessary */
 677
 678         SMTP_DBG_READ();
 679
 680         if (!SMTP_IS_STATE('2')) {
 681                 if (SMTP_IS_STATE('4'))
 682                         SMTP_VERROR(4);
 683                 else
 684                         SMTP_VERROR(5);
 685         }
 686         return eSendReply;
 687 }
 688
 689 eNextState SMTPC_send_FROM(SmtpOutMsg *SendMsg)
 690 {
 691         /* previous command succeeded, now try the MAIL FROM: command */
 692         StrBufPrintf(SendMsg->IO.SendBuf.Buf,
 693                      "MAIL FROM:<%s>\r\n",
 694                      SendMsg->envelope_from);
 695
 696         SMTP_DBG_SEND();
 697         return eReadMessage;
 698 }
 699
 700 eNextState SMTPC_read_FROM_reply(SmtpOutMsg *SendMsg)
 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
 714 eNextState SMTPC_send_RCPT(SmtpOutMsg *SendMsg)
 715 {
 716         /* MAIL succeeded, now try the RCPT To: command */
 717         StrBufPrintf(SendMsg->IO.SendBuf.Buf,
 718                      "RCPT TO:<%s@%s>\r\n",
 719                      SendMsg->user,
 720                      SendMsg->node);
 721
 722         SMTP_DBG_SEND();
 723         return eReadMessage;
 724 }
 725
 726 eNextState SMTPC_read_RCPT_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 eNextState SMTPC_send_DATAcmd(SmtpOutMsg *SendMsg)
 740 {
 741         /* RCPT succeeded, now try the DATA command */
 742         StrBufPlain(SendMsg->IO.SendBuf.Buf,
 743                     HKEY("DATA\r\n"));
 744
 745         SMTP_DBG_SEND();
 746         return eReadMessage;
 747 }
 748
 749 eNextState SMTPC_read_DATAcmd_reply(SmtpOutMsg *SendMsg)
 750 {
 751         SMTP_DBG_READ();
 752
 753         if (!SMTP_IS_STATE('3')) {
 754                 if (SMTP_IS_STATE('4'))
 755                         SMTP_VERROR(3);
 756                 else
 757                         SMTP_VERROR(5);
 758         }
 759         return eSendReply;
 760 }
 761
 762 eNextState SMTPC_send_data_body(SmtpOutMsg *SendMsg)
 763 {
 764         StrBuf *Buf;
 765         /* If we reach this point, the server is expecting data.*/
 766
 767         Buf = SendMsg->IO.SendBuf.Buf;
 768         SendMsg->IO.SendBuf.Buf = SendMsg->msgtext;
 769         SendMsg->msgtext = Buf;
 770         SendMsg->State ++;
 771
 772         return eSendMore;
 773 }
 774
 775 eNextState SMTPC_send_terminate_data_body(SmtpOutMsg *SendMsg)
 776 {
 777         StrBuf *Buf;
 778
 779         Buf = SendMsg->IO.SendBuf.Buf;
 780         SendMsg->IO.SendBuf.Buf = SendMsg->msgtext;
 781         SendMsg->msgtext = Buf;
 782
 783         StrBufPlain(SendMsg->IO.SendBuf.Buf,
 784                     HKEY(".\r\n"));
 785
 786         return eReadMessage;
 787
 788 }
 789
 790 eNextState SMTPC_read_data_body_reply(SmtpOutMsg *SendMsg)
 791 {
 792         SMTP_DBG_READ();
 793
 794         if (!SMTP_IS_STATE('2')) {
 795                 if (SMTP_IS_STATE('4'))
 796                         SMTP_VERROR(4);
 797                 else
 798                         SMTP_VERROR(5);
 799         }
 800
 801         /* We did it! */
 802         StrBufPlain(SendMsg->MyQEntry->StatusMessage,
 803                     &ChrPtr(SendMsg->IO.RecvBuf.Buf)[4],
 804                     StrLength(SendMsg->IO.RecvBuf.Buf) - 4);
 805         SendMsg->MyQEntry->Status = 2;
 806         return eSendReply;
 807 }
 808
 809 eNextState SMTPC_send_QUIT(SmtpOutMsg *SendMsg)
 810 {
 811         StrBufPlain(SendMsg->IO.SendBuf.Buf,
 812                     HKEY("QUIT\r\n"));
 813
 814         SMTP_DBG_SEND();
 815         return eReadMessage;
 816 }
 817
 818 eNextState SMTPC_read_QUIT_reply(SmtpOutMsg *SendMsg)
 819 {
 820         SMTP_DBG_READ();
 821
 822         CtdlLogPrintf(CTDL_INFO, "SMTP client[%ld]: delivery to <%s> @ <%s> (%s) succeeded\n",
 823                       SendMsg->n, SendMsg->user, SendMsg->node, SendMsg->name);
 824         return eTerminateConnection;
 825 }
 826
 827 eNextState SMTPC_read_dummy(SmtpOutMsg *SendMsg)
 828 {
 829         return eSendReply;
 830 }
 831
 832 eNextState SMTPC_send_dummy(SmtpOutMsg *SendMsg)
 833 {
 834         return eReadMessage;
 835 }
 836
 837
 838 /*****************************************************************************/
 839 /*                     SMTP CLIENT DISPATCHER                                */
 840 /*****************************************************************************/
 841 SMTPReadHandler ReadHandlers[eMaxSMTPC] = {
 842         SMTPC_read_greeting,
 843         SMTPC_read_EHLO_reply,
 844         SMTPC_read_HELO_reply,
 845         SMTPC_read_auth_reply,
 846         SMTPC_read_FROM_reply,
 847         SMTPC_read_RCPT_reply,
 848         SMTPC_read_DATAcmd_reply,
 849         SMTPC_read_dummy,
 850         SMTPC_read_data_body_reply,
 851         SMTPC_read_QUIT_reply
 852 };
 853 SMTPSendHandler SendHandlers[eMaxSMTPC] = {
 854         SMTPC_send_dummy, /* we don't send a greeting, the server does... */
 855         SMTPC_send_EHLO,
 856         STMPC_send_HELO,
 857         SMTPC_send_auth,
 858         SMTPC_send_FROM,
 859         SMTPC_send_RCPT,
 860         SMTPC_send_DATAcmd,
 861         SMTPC_send_data_body,
 862         SMTPC_send_terminate_data_body,
 863         SMTPC_send_QUIT
 864 };
 865
 866 void SMTPSetTimeout(eNextState NextTCPState, SmtpOutMsg *pMsg)
 867 {
 868         CtdlLogPrintf(CTDL_DEBUG, "SMTP: %s\n", __FUNCTION__);
 869         double Timeout;
 870         switch (NextTCPState) {
 871         case eSendReply:
 872         case eSendMore:
 873                 Timeout = SMTP_C_SendTimeouts[pMsg->State];
 874                 if (pMsg->State == eDATABody) {
 875                         /* if we're sending a huge message, we need more time. */
 876                         Timeout += StrLength(pMsg->msgtext) / 1024;
 877                 }
 878                 break;
 879         case eReadMessage:
 880                 Timeout = SMTP_C_ReadTimeouts[pMsg->State];
 881                 if (pMsg->State == eDATATerminateBody) {
 882                         /*
 883                          * some mailservers take a nap before accepting the message
 884                          * content inspection and such.
 885                          */
 886                         Timeout += StrLength(pMsg->msgtext) / 1024;
 887                 }
 888                 break;
 889         case eTerminateConnection:
 890         case eAbort:
 891                 return;
 892         }
 893         SetNextTimeout(&pMsg->IO, Timeout);
 894 }
 895 eNextState SMTP_C_DispatchReadDone(AsyncIO *IO)
 896 {
 897         CtdlLogPrintf(CTDL_DEBUG, "SMTP: %s\n", __FUNCTION__);
 898         SmtpOutMsg *pMsg = IO->Data;
 899         eNextState rc;
 900
 901         rc = ReadHandlers[pMsg->State](pMsg);
 902         pMsg->State++;
 903         SMTPSetTimeout(rc, pMsg);
 904         return rc;
 905 }
 906 eNextState SMTP_C_DispatchWriteDone(AsyncIO *IO)
 907 {
 908         CtdlLogPrintf(CTDL_DEBUG, "SMTP: %s\n", __FUNCTION__);
 909         SmtpOutMsg *pMsg = IO->Data;
 910         eNextState rc;
 911
 912         rc = SendHandlers[pMsg->State](pMsg);
 913         SMTPSetTimeout(rc, pMsg);
 914         return rc;
 915 }
 916
 917
 918 /*****************************************************************************/
 919 /*                     SMTP CLIENT ERROR CATCHERS                            */
 920 /*****************************************************************************/
 921 eNextState SMTP_C_Terminate(AsyncIO *IO)
 922 {
 923         CtdlLogPrintf(CTDL_DEBUG, "SMTP: %s\n", __FUNCTION__);
 924         SmtpOutMsg *pMsg = IO->Data;
 925         FinalizeMessageSend(pMsg);
 926         return 0;
 927 }
 928 eNextState SMTP_C_Timeout(AsyncIO *IO)
 929 {
 930         CtdlLogPrintf(CTDL_DEBUG, "SMTP: %s\n", __FUNCTION__);
 931         SmtpOutMsg *pMsg = IO->Data;
 932         StrBufPlain(IO->ErrMsg, CKEY(ReadErrors[pMsg->State]));
 933         FinalizeMessageSend(pMsg);
 934         return 0;
 935 }
 936 eNextState SMTP_C_ConnFail(AsyncIO *IO)
 937 {
 938         CtdlLogPrintf(CTDL_DEBUG, "SMTP: %s\n", __FUNCTION__);
 939         SmtpOutMsg *pMsg = IO->Data;
 940         FinalizeMessageSend(pMsg);
 941         return 0;
 942 }
 943
 944
 945 /**
 946  * @brief lineread Handler; understands when to read more SMTP lines, and when this is a one-lined reply.
 947  */
 948 eReadState SMTP_C_ReadServerStatus(AsyncIO *IO)
 949 {
 950         eReadState Finished = eBufferNotEmpty;
 951
 952         while (Finished == eBufferNotEmpty) {
 953                 Finished = StrBufChunkSipLine(IO->IOBuf, &IO->RecvBuf);
 954
 955                 switch (Finished) {
 956                 case eMustReadMore: /// read new from socket...
 957                         return Finished;
 958                         break;
 959                 case eBufferNotEmpty: /* shouldn't happen... */
 960                 case eReadSuccess: /// done for now...
 961                         if (StrLength(IO->IOBuf) < 4)
 962                                 continue;
 963                         if (ChrPtr(IO->IOBuf)[3] == '-')
 964                                 Finished = eBufferNotEmpty;
 965                         else
 966                                 return Finished;
 967                         break;
 968                 case eReadFail: /// WHUT?
 969                         ///todo: shut down!
 970                         break;
 971                 }
 972         }
 973         return Finished;
 974 }
 975
 976 #endif
 977 CTDL_MODULE_INIT(smtp_eventclient)
 978 {
 979         return "smtpeventclient";
 980 }