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                 unsigned long psaddr;
 272                 struct sockaddr_in *addr = (struct sockaddr_in *)&IO->Addr;
 273
 274                 src = &addr->sin_addr.s_addr;
 275                 memcpy(&psaddr, &addr->sin_addr.s_addr, sizeof(psaddr));
 276 ///             psaddr = ntohl(psaddr);
 277 /*
 278                 CtdlLogPrintf(CTDL_DEBUG,
 279                               "SMTP client[%ld]: connecting to %s [%ld.%ld.%ld.%ld:%d] ...\n",
 280                               SendMsg->n,
 281                               SendMsg->mx_host,
 282                               (psaddr >> 24) & 0xFF,
 283                               (psaddr >> 16) & 0xFF,
 284                               (psaddr >>  8) & 0xFF,
 285                               (psaddr >>  0) & 0xFF,
 286                               SendMsg->IO.dport);
 287
 288                 SendMsg->MyQEntry->Status = 5;
 289                 StrBufPrintf(SendMsg->MyQEntry->StatusMessage,
 290                              "Timeout while connecting %s [%ld.%ld.%ld.%ld:%d] ",
 291                              SendMsg->mx_host,
 292                              (psaddr >> 24) & 0xFF,
 293                              (psaddr >> 16) & 0xFF,
 294                              (psaddr >>  8) & 0xFF,
 295                              (psaddr >>  0) & 0xFF,
 296                              SendMsg->IO.dport);
 297
 298 */
 299         }
 300
 301         inet_ntop((IO->IP6)?AF_INET6:AF_INET,
 302                   src,
 303                   buf, sizeof(buf));
 304
 305         CtdlLogPrintf(CTDL_DEBUG,
 306                       "SMTP client[%ld]: connecting to %s [%s]:%d ...\n",
 307                       SendMsg->n,
 308                       SendMsg->mx_host,
 309                       buf,
 310                       SendMsg->IO.dport);
 311
 312         SendMsg->MyQEntry->Status = 5;
 313         StrBufPrintf(SendMsg->MyQEntry->StatusMessage,
 314                      "Timeout while connecting %s [%s]:%d ",
 315                      SendMsg->mx_host,
 316                      buf,
 317                      SendMsg->IO.dport);
 318 }
 319
 320 eNextState mx_connect_relay_ip(AsyncIO *IO)
 321 {
 322
 323         SmtpOutMsg *SendMsg = IO->Data;
 324
 325         CtdlLogPrintf(CTDL_DEBUG, "SMTP: %s\n", __FUNCTION__);
 326
 327         IO->IP6 = SendMsg->pCurrRelay->af == AF_INET6;
 328
 329         if (SendMsg->pCurrRelay->Port != 0)
 330                 IO->dport = SendMsg->pCurrRelay->Port;
 331
 332         memset(&IO->Addr, 0, sizeof(struct in6_addr));
 333         if (IO->IP6) {
 334                 memcpy(&IO->Addr.sin6_addr.s6_addr,
 335                        &SendMsg->pCurrRelay->Addr,
 336                        sizeof(struct in6_addr));
 337
 338                 IO->Addr.sin6_family = AF_INET6;
 339                 IO->Addr.sin6_port = htons(IO->dport);
 340         }
 341         else {
 342                 struct sockaddr_in *addr = (struct sockaddr_in*) &IO->Addr;
 343                 /* Bypass the ns lookup result like this: IO->Addr.sin_addr.s_addr = inet_addr("127.0.0.1"); */
 344                 memcpy(&addr->sin_addr,///.s_addr,
 345                        &SendMsg->pCurrRelay->Addr,
 346                        sizeof(struct in_addr));
 347
 348                 addr->sin_family = AF_INET;
 349                 addr->sin_port = htons(IO->dport);
 350         }
 351
 352         SetConnectStatus(IO);
 353
 354         return InitEventIO(IO, SendMsg,
 355                            SMTP_C_ConnTimeout,
 356                            SMTP_C_ReadTimeouts[0],
 357                             1);
 358 }
 359
 360 void get_one_mx_host_ip_done(void *Ctx,
 361                              int status,
 362                              int timeouts,
 363                              struct hostent *hostent)
 364 {
 365         AsyncIO *IO = (AsyncIO *) Ctx;
 366         SmtpOutMsg *SendMsg = IO->Data;
 367         eNextState State = eAbort;
 368
 369         if ((status == ARES_SUCCESS) && (hostent != NULL) ) {
 370
 371                 IO->IP6  = hostent->h_addrtype == AF_INET6;
 372                 IO->HEnt = hostent;
 373
 374                 memset(&IO->Addr, 0, sizeof(struct in6_addr));
 375                 if (IO->IP6) {
 376                         memcpy(&IO->Addr.sin6_addr.s6_addr,
 377                                &hostent->h_addr_list[0],
 378                                sizeof(struct in6_addr));
 379
 380                         IO->Addr.sin6_family = hostent->h_addrtype;
 381                         IO->Addr.sin6_port = htons(IO->dport);
 382                 }
 383                 else {
 384                         struct sockaddr_in *addr = (struct sockaddr_in*) &IO->Addr;
 385                         /* Bypass the ns lookup result like this: IO->Addr.sin_addr.s_addr = inet_addr("127.0.0.1"); */
 386 //                      addr->sin_addr.s_addr = htonl((uint32_t)&hostent->h_addr_list[0]);
 387                         memcpy(&addr->sin_addr.s_addr, hostent->h_addr_list[0], sizeof(uint32_t));
 388
 389                         addr->sin_family = hostent->h_addrtype;
 390                         addr->sin_port = htons(IO->dport);
 391
 392                 }
 393                 SendMsg->IO.HEnt = hostent;
 394                 SetConnectStatus(IO);
 395                 State = InitEventIO(IO, SendMsg,
 396                                    SMTP_C_ConnTimeout,
 397                                    SMTP_C_ReadTimeouts[0],
 398                                    1);
 399         }
 400         if (State == eAbort)
 401                 SMTP_C_Terminate(IO);
 402 }
 403
 404 const unsigned short DefaultMXPort = 25;
 405 eNextState get_one_mx_host_ip(AsyncIO *IO)
 406 {
 407         SmtpOutMsg * SendMsg = IO->Data;
 408         const char *Hostname;
 409         //char *endpart;
 410         //char buf[SIZ];
 411         InitC_ares_dns(IO);
 412
 413         if (SendMsg->CurrMX) {
 414                 SendMsg->mx_host = SendMsg->CurrMX->host;
 415                 SendMsg->CurrMX = SendMsg->CurrMX->next;
 416         }
 417
 418         if (SendMsg->pCurrRelay != NULL) Hostname = SendMsg->pCurrRelay->Host;
 419         else if (SendMsg->mx_host != NULL) Hostname = SendMsg->mx_host;
 420         else Hostname = SendMsg->node;
 421
 422         CtdlLogPrintf(CTDL_DEBUG, "SMTP: %s\n", __FUNCTION__);
 423
 424         CtdlLogPrintf(CTDL_DEBUG,
 425                       "SMTP client[%ld]: looking up %s : %d ...\n",
 426                       SendMsg->n,
 427                       Hostname,
 428                       SendMsg->IO.dport);
 429
 430         ares_gethostbyname(SendMsg->IO.DNSChannel,
 431                            Hostname,
 432                            AF_INET6, /* it falls back to ipv4 in doubt... */
 433                            get_one_mx_host_ip_done,
 434                            &SendMsg->IO);
 435         return IO->NextState;
 436 }
 437
 438
 439 eNextState smtp_resolve_mx_done(AsyncIO *IO)
 440 {
 441         SmtpOutMsg * SendMsg = IO->Data;
 442
 443         CtdlLogPrintf(CTDL_DEBUG, "SMTP: %s\n", __FUNCTION__);
 444
 445         SendMsg->IO.SendBuf.Buf = NewStrBufPlain(NULL, 1024);
 446         SendMsg->IO.RecvBuf.Buf = NewStrBufPlain(NULL, 1024);
 447         SendMsg->IO.IOBuf = NewStrBuf();
 448         SendMsg->IO.ErrMsg = SendMsg->MyQEntry->StatusMessage;
 449
 450         SendMsg->CurrMX = SendMsg->AllMX = IO->VParsedDNSReply;
 451         //// TODO: should we remove the current ares context???
 452         get_one_mx_host_ip(IO);
 453         return IO->NextState;
 454 }
 455
 456
 457 eNextState resolve_mx_records(AsyncIO *IO)
 458 {
 459         SmtpOutMsg * SendMsg = IO->Data;
 460
 461         CtdlLogPrintf(CTDL_DEBUG, "SMTP: %s\n", __FUNCTION__);
 462
 463         if (!QueueQuery(ns_t_mx,
 464                         SendMsg->node,
 465                         &SendMsg->IO,
 466                         smtp_resolve_mx_done))
 467         {
 468                 SendMsg->MyQEntry->Status = 5;
 469                 StrBufPrintf(SendMsg->MyQEntry->StatusMessage,
 470                              "No MX hosts found for <%s>", SendMsg->node);
 471                 return IO->NextState;
 472         }
 473         return eAbort;
 474 }
 475
 476
 477 int smtp_resolve_recipients(SmtpOutMsg *SendMsg)
 478 {
 479         const char *ptr;
 480         char buf[1024];
 481         int scan_done;
 482         int lp, rp;
 483         int i;
 484
 485         CtdlLogPrintf(CTDL_DEBUG, "SMTP: %s\n", __FUNCTION__);
 486
 487         if ((SendMsg==NULL) ||
 488             (SendMsg->MyQEntry == NULL) ||
 489             (StrLength(SendMsg->MyQEntry->Recipient) == 0)) {
 490                 return 0;
 491         }
 492
 493         /* Parse out the host portion of the recipient address */
 494         process_rfc822_addr(ChrPtr(SendMsg->MyQEntry->Recipient),
 495                             SendMsg->user,
 496                             SendMsg->node,
 497                             SendMsg->name);
 498
 499         CtdlLogPrintf(CTDL_DEBUG, "SMTP client[%ld]: Attempting delivery to <%s> @ <%s> (%s)\n",
 500                       SendMsg->n, SendMsg->user, SendMsg->node, SendMsg->name);
 501         /* If no envelope_from is supplied, extract one from the message */
 502         if ( (SendMsg->envelope_from == NULL) ||
 503              (IsEmptyStr(SendMsg->envelope_from)) ) {
 504                 SendMsg->mailfrom[0] = '\0';
 505                 scan_done = 0;
 506                 ptr = ChrPtr(SendMsg->msgtext);
 507                 do {
 508                         if (ptr = cmemreadline(ptr, buf, sizeof buf), *ptr == 0) {
 509                                 scan_done = 1;
 510                         }
 511                         if (!strncasecmp(buf, "From:", 5)) {
 512                                 safestrncpy(SendMsg->mailfrom, &buf[5], sizeof SendMsg->mailfrom);
 513                                 striplt(SendMsg->mailfrom);
 514                                 for (i=0; SendMsg->mailfrom[i]; ++i) {
 515                                         if (!isprint(SendMsg->mailfrom[i])) {
 516                                                 strcpy(&SendMsg->mailfrom[i], &SendMsg->mailfrom[i+1]);
 517                                                 i=0;
 518                                         }
 519                                 }
 520
 521                                 /* Strip out parenthesized names */
 522                                 lp = (-1);
 523                                 rp = (-1);
 524                                 for (i=0; !IsEmptyStr(SendMsg->mailfrom + i); ++i) {
 525                                         if (SendMsg->mailfrom[i] == '(') lp = i;
 526                                         if (SendMsg->mailfrom[i] == ')') rp = i;
 527                                 }
 528                                 if ((lp>0)&&(rp>lp)) {
 529                                         strcpy(&SendMsg->mailfrom[lp-1], &SendMsg->mailfrom[rp+1]);
 530                                 }
 531
 532                                 /* Prefer brokketized names */
 533                                 lp = (-1);
 534                                 rp = (-1);
 535                                 for (i=0; !IsEmptyStr(SendMsg->mailfrom + i); ++i) {
 536                                         if (SendMsg->mailfrom[i] == '<') lp = i;
 537                                         if (SendMsg->mailfrom[i] == '>') rp = i;
 538                                 }
 539                                 if ( (lp>=0) && (rp>lp) ) {
 540                                         SendMsg->mailfrom[rp] = 0;
 541                                         memmove(SendMsg->mailfrom,
 542                                                 &SendMsg->mailfrom[lp + 1],
 543                                                 rp - lp);
 544                                 }
 545
 546                                 scan_done = 1;
 547                         }
 548                 } while (scan_done == 0);
 549                 if (IsEmptyStr(SendMsg->mailfrom)) strcpy(SendMsg->mailfrom, "someone@somewhere.org");
 550                 stripallbut(SendMsg->mailfrom, '<', '>');
 551                 SendMsg->envelope_from = SendMsg->mailfrom;
 552         }
 553
 554         return 1;
 555 }
 556
 557
 558
 559 void smtp_try(OneQueItem *MyQItem,
 560               MailQEntry *MyQEntry,
 561               StrBuf *MsgText,
 562               int KeepMsgText,  /* KeepMsgText allows us to use MsgText as ours. */
 563               int MsgCount)
 564 {
 565         SmtpOutMsg * SendMsg;
 566
 567         CtdlLogPrintf(CTDL_DEBUG, "SMTP: %s\n", __FUNCTION__);
 568
 569         SendMsg = (SmtpOutMsg *) malloc(sizeof(SmtpOutMsg));
 570         memset(SendMsg, 0, sizeof(SmtpOutMsg));
 571         SendMsg->IO.sock      = (-1);
 572         SendMsg->IO.NextState = eReadMessage;
 573         SendMsg->n            = MsgCount++;
 574         SendMsg->MyQEntry     = MyQEntry;
 575         SendMsg->MyQItem      = MyQItem;
 576         SendMsg->pCurrRelay   = MyQItem->URL;
 577
 578         SendMsg->IO.dport       = DefaultMXPort;
 579         SendMsg->IO.Data        = SendMsg;
 580         SendMsg->IO.SendDone    = SMTP_C_DispatchWriteDone;
 581         SendMsg->IO.ReadDone    = SMTP_C_DispatchReadDone;
 582         SendMsg->IO.Terminate   = SMTP_C_Terminate;
 583         SendMsg->IO.LineReader  = SMTP_C_ReadServerStatus;
 584         SendMsg->IO.ConnFail    = SMTP_C_ConnFail;
 585         SendMsg->IO.Timeout     = SMTP_C_Timeout;
 586
 587         if (KeepMsgText) {
 588                 SendMsg->msgtext    = MsgText;
 589         }
 590         else {
 591                 SendMsg->msgtext = NewStrBufDup(MsgText);
 592         }
 593
 594         if (smtp_resolve_recipients(SendMsg)) {
 595                 if (SendMsg->pCurrRelay == NULL)
 596                         QueueEventContext(&SendMsg->IO,
 597                                           resolve_mx_records);
 598                 else {
 599                         if (SendMsg->pCurrRelay->IsIP) {
 600                                 QueueEventContext(&SendMsg->IO,
 601                                                   mx_connect_relay_ip);
 602                         }
 603                         else {
 604                                 QueueEventContext(&SendMsg->IO,
 605                                                   get_one_mx_host_ip);
 606                         }
 607                 }
 608         }
 609         else {
 610                 if ((SendMsg==NULL) ||
 611                     (SendMsg->MyQEntry == NULL)) {
 612                         SendMsg->MyQEntry->Status = 5;
 613                         StrBufPlain(SendMsg->MyQEntry->StatusMessage,
 614                                     HKEY("Invalid Recipient!"));
 615                 }
 616                 FinalizeMessageSend(SendMsg);
 617         }
 618 }
 619
 620
 621
 622
 623
 624 /*****************************************************************************/
 625 /*                     SMTP CLIENT STATE CALLBACKS                           */
 626 /*****************************************************************************/
 627 eNextState SMTPC_read_greeting(SmtpOutMsg *SendMsg)
 628 {
 629         /* Process the SMTP greeting from the server */
 630         SMTP_DBG_READ();
 631
 632         if (!SMTP_IS_STATE('2')) {
 633                 if (SMTP_IS_STATE('4'))
 634                         SMTP_VERROR(4);
 635                 else
 636                         SMTP_VERROR(5);
 637         }
 638         return eSendReply;
 639 }
 640
 641 eNextState SMTPC_send_EHLO(SmtpOutMsg *SendMsg)
 642 {
 643         /* At this point we know we are talking to a real SMTP server */
 644
 645         /* Do a EHLO command.  If it fails, try the HELO command. */
 646         StrBufPrintf(SendMsg->IO.SendBuf.Buf,
 647                      "EHLO %s\r\n", config.c_fqdn);
 648
 649         SMTP_DBG_SEND();
 650         return eReadMessage;
 651 }
 652
 653 eNextState SMTPC_read_EHLO_reply(SmtpOutMsg *SendMsg)
 654 {
 655         SMTP_DBG_READ();
 656
 657         if (SMTP_IS_STATE('2')) {
 658                 SendMsg->State ++;
 659
 660                 if ((SendMsg->pCurrRelay == NULL) ||
 661                     (SendMsg->pCurrRelay->User == NULL))
 662                         SendMsg->State ++; /* Skip auth... */
 663         }
 664         /* else we fall back to 'helo' */
 665         return eSendReply;
 666 }
 667
 668 eNextState STMPC_send_HELO(SmtpOutMsg *SendMsg)
 669 {
 670         StrBufPrintf(SendMsg->IO.SendBuf.Buf,
 671                      "HELO %s\r\n", config.c_fqdn);
 672
 673         SMTP_DBG_SEND();
 674         return eReadMessage;
 675 }
 676
 677 eNextState SMTPC_read_HELO_reply(SmtpOutMsg *SendMsg)
 678 {
 679         SMTP_DBG_READ();
 680
 681         if (!SMTP_IS_STATE('2')) {
 682                 if (SMTP_IS_STATE('4'))
 683                         SMTP_VERROR(4);
 684                 else
 685                         SMTP_VERROR(5);
 686         }
 687                 if ((SendMsg->pCurrRelay == NULL) ||
 688                     (SendMsg->pCurrRelay->User == NULL))
 689                 SendMsg->State ++; /* Skip auth... */
 690         return eSendReply;
 691 }
 692
 693 eNextState SMTPC_send_auth(SmtpOutMsg *SendMsg)
 694 {
 695         char buf[SIZ];
 696         char encoded[1024];
 697
 698         if ((SendMsg->pCurrRelay == NULL) ||
 699             (SendMsg->pCurrRelay->User == NULL))
 700                 SendMsg->State ++; /* Skip auth, shouldn't even come here!... */
 701         else {
 702         /* Do an AUTH command if necessary */
 703         sprintf(buf, "%s%c%s%c%s",
 704                 SendMsg->pCurrRelay->User, '\0',
 705                 SendMsg->pCurrRelay->User, '\0',
 706                 SendMsg->pCurrRelay->Pass);
 707         CtdlEncodeBase64(encoded, buf,
 708                          strlen(SendMsg->pCurrRelay->User) * 2 +
 709                          strlen(SendMsg->pCurrRelay->Pass) + 2, 0);
 710         StrBufPrintf(SendMsg->IO.SendBuf.Buf,
 711                      "AUTH PLAIN %s\r\n", encoded);
 712         }
 713         SMTP_DBG_SEND();
 714         return eReadMessage;
 715 }
 716
 717 eNextState SMTPC_read_auth_reply(SmtpOutMsg *SendMsg)
 718 {
 719         /* Do an AUTH command if necessary */
 720
 721         SMTP_DBG_READ();
 722
 723         if (!SMTP_IS_STATE('2')) {
 724                 if (SMTP_IS_STATE('4'))
 725                         SMTP_VERROR(4);
 726                 else
 727                         SMTP_VERROR(5);
 728         }
 729         return eSendReply;
 730 }
 731
 732 eNextState SMTPC_send_FROM(SmtpOutMsg *SendMsg)
 733 {
 734         /* previous command succeeded, now try the MAIL FROM: command */
 735         StrBufPrintf(SendMsg->IO.SendBuf.Buf,
 736                      "MAIL FROM:<%s>\r\n",
 737                      SendMsg->envelope_from);
 738
 739         SMTP_DBG_SEND();
 740         return eReadMessage;
 741 }
 742
 743 eNextState SMTPC_read_FROM_reply(SmtpOutMsg *SendMsg)
 744 {
 745         SMTP_DBG_READ();
 746
 747         if (!SMTP_IS_STATE('2')) {
 748                 if (SMTP_IS_STATE('4'))
 749                         SMTP_VERROR(4);
 750                 else
 751                         SMTP_VERROR(5);
 752         }
 753         return eSendReply;
 754 }
 755
 756
 757 eNextState SMTPC_send_RCPT(SmtpOutMsg *SendMsg)
 758 {
 759         /* MAIL succeeded, now try the RCPT To: command */
 760         StrBufPrintf(SendMsg->IO.SendBuf.Buf,
 761                      "RCPT TO:<%s@%s>\r\n",
 762                      SendMsg->user,
 763                      SendMsg->node);
 764
 765         SMTP_DBG_SEND();
 766         return eReadMessage;
 767 }
 768
 769 eNextState SMTPC_read_RCPT_reply(SmtpOutMsg *SendMsg)
 770 {
 771         SMTP_DBG_READ();
 772
 773         if (!SMTP_IS_STATE('2')) {
 774                 if (SMTP_IS_STATE('4'))
 775                         SMTP_VERROR(4);
 776                 else
 777                         SMTP_VERROR(5);
 778         }
 779         return eSendReply;
 780 }
 781
 782 eNextState SMTPC_send_DATAcmd(SmtpOutMsg *SendMsg)
 783 {
 784         /* RCPT succeeded, now try the DATA command */
 785         StrBufPlain(SendMsg->IO.SendBuf.Buf,
 786                     HKEY("DATA\r\n"));
 787
 788         SMTP_DBG_SEND();
 789         return eReadMessage;
 790 }
 791
 792 eNextState SMTPC_read_DATAcmd_reply(SmtpOutMsg *SendMsg)
 793 {
 794         SMTP_DBG_READ();
 795
 796         if (!SMTP_IS_STATE('3')) {
 797                 if (SMTP_IS_STATE('4'))
 798                         SMTP_VERROR(3);
 799                 else
 800                         SMTP_VERROR(5);
 801         }
 802         return eSendReply;
 803 }
 804
 805 eNextState SMTPC_send_data_body(SmtpOutMsg *SendMsg)
 806 {
 807         StrBuf *Buf;
 808         /* If we reach this point, the server is expecting data.*/
 809
 810         Buf = SendMsg->IO.SendBuf.Buf;
 811         SendMsg->IO.SendBuf.Buf = SendMsg->msgtext;
 812         SendMsg->msgtext = Buf;
 813         SendMsg->State ++;
 814
 815         return eSendMore;
 816 }
 817
 818 eNextState SMTPC_send_terminate_data_body(SmtpOutMsg *SendMsg)
 819 {
 820         StrBuf *Buf;
 821
 822         Buf = SendMsg->IO.SendBuf.Buf;
 823         SendMsg->IO.SendBuf.Buf = SendMsg->msgtext;
 824         SendMsg->msgtext = Buf;
 825
 826         StrBufPlain(SendMsg->IO.SendBuf.Buf,
 827                     HKEY(".\r\n"));
 828
 829         return eReadMessage;
 830
 831 }
 832
 833 eNextState SMTPC_read_data_body_reply(SmtpOutMsg *SendMsg)
 834 {
 835         SMTP_DBG_READ();
 836
 837         if (!SMTP_IS_STATE('2')) {
 838                 if (SMTP_IS_STATE('4'))
 839                         SMTP_VERROR(4);
 840                 else
 841                         SMTP_VERROR(5);
 842         }
 843
 844         /* We did it! */
 845         StrBufPlain(SendMsg->MyQEntry->StatusMessage,
 846                     &ChrPtr(SendMsg->IO.RecvBuf.Buf)[4],
 847                     StrLength(SendMsg->IO.RecvBuf.Buf) - 4);
 848         SendMsg->MyQEntry->Status = 2;
 849         return eSendReply;
 850 }
 851
 852 eNextState SMTPC_send_QUIT(SmtpOutMsg *SendMsg)
 853 {
 854         StrBufPlain(SendMsg->IO.SendBuf.Buf,
 855                     HKEY("QUIT\r\n"));
 856
 857         SMTP_DBG_SEND();
 858         return eReadMessage;
 859 }
 860
 861 eNextState SMTPC_read_QUIT_reply(SmtpOutMsg *SendMsg)
 862 {
 863         SMTP_DBG_READ();
 864
 865         CtdlLogPrintf(CTDL_INFO, "SMTP client[%ld]: delivery to <%s> @ <%s> (%s) succeeded\n",
 866                       SendMsg->n, SendMsg->user, SendMsg->node, SendMsg->name);
 867         return eTerminateConnection;
 868 }
 869
 870 eNextState SMTPC_read_dummy(SmtpOutMsg *SendMsg)
 871 {
 872         return eSendReply;
 873 }
 874
 875 eNextState SMTPC_send_dummy(SmtpOutMsg *SendMsg)
 876 {
 877         return eReadMessage;
 878 }
 879
 880
 881 /*****************************************************************************/
 882 /*                     SMTP CLIENT DISPATCHER                                */
 883 /*****************************************************************************/
 884 SMTPReadHandler ReadHandlers[eMaxSMTPC] = {
 885         SMTPC_read_greeting,
 886         SMTPC_read_EHLO_reply,
 887         SMTPC_read_HELO_reply,
 888         SMTPC_read_auth_reply,
 889         SMTPC_read_FROM_reply,
 890         SMTPC_read_RCPT_reply,
 891         SMTPC_read_DATAcmd_reply,
 892         SMTPC_read_dummy,
 893         SMTPC_read_data_body_reply,
 894         SMTPC_read_QUIT_reply
 895 };
 896 SMTPSendHandler SendHandlers[eMaxSMTPC] = {
 897         SMTPC_send_dummy, /* we don't send a greeting, the server does... */
 898         SMTPC_send_EHLO,
 899         STMPC_send_HELO,
 900         SMTPC_send_auth,
 901         SMTPC_send_FROM,
 902         SMTPC_send_RCPT,
 903         SMTPC_send_DATAcmd,
 904         SMTPC_send_data_body,
 905         SMTPC_send_terminate_data_body,
 906         SMTPC_send_QUIT
 907 };
 908
 909 void SMTPSetTimeout(eNextState NextTCPState, SmtpOutMsg *pMsg)
 910 {
 911         CtdlLogPrintf(CTDL_DEBUG, "SMTP: %s\n", __FUNCTION__);
 912         double Timeout;
 913         switch (NextTCPState) {
 914         case eSendReply:
 915         case eSendMore:
 916                 Timeout = SMTP_C_SendTimeouts[pMsg->State];
 917                 if (pMsg->State == eDATABody) {
 918                         /* if we're sending a huge message, we need more time. */
 919                         Timeout += StrLength(pMsg->msgtext) / 1024;
 920                 }
 921                 break;
 922         case eReadMessage:
 923                 Timeout = SMTP_C_ReadTimeouts[pMsg->State];
 924                 if (pMsg->State == eDATATerminateBody) {
 925                         /*
 926                          * some mailservers take a nap before accepting the message
 927                          * content inspection and such.
 928                          */
 929                         Timeout += StrLength(pMsg->msgtext) / 1024;
 930                 }
 931                 break;
 932         case eTerminateConnection:
 933         case eAbort:
 934                 return;
 935         }
 936         SetNextTimeout(&pMsg->IO, Timeout);
 937 }
 938 eNextState SMTP_C_DispatchReadDone(AsyncIO *IO)
 939 {
 940         CtdlLogPrintf(CTDL_DEBUG, "SMTP: %s\n", __FUNCTION__);
 941         SmtpOutMsg *pMsg = IO->Data;
 942         eNextState rc;
 943
 944         rc = ReadHandlers[pMsg->State](pMsg);
 945         pMsg->State++;
 946         SMTPSetTimeout(rc, pMsg);
 947         return rc;
 948 }
 949 eNextState SMTP_C_DispatchWriteDone(AsyncIO *IO)
 950 {
 951         CtdlLogPrintf(CTDL_DEBUG, "SMTP: %s\n", __FUNCTION__);
 952         SmtpOutMsg *pMsg = IO->Data;
 953         eNextState rc;
 954
 955         rc = SendHandlers[pMsg->State](pMsg);
 956         SMTPSetTimeout(rc, pMsg);
 957         return rc;
 958 }
 959
 960
 961 /*****************************************************************************/
 962 /*                     SMTP CLIENT ERROR CATCHERS                            */
 963 /*****************************************************************************/
 964 eNextState SMTP_C_Terminate(AsyncIO *IO)
 965 {
 966         CtdlLogPrintf(CTDL_DEBUG, "SMTP: %s\n", __FUNCTION__);
 967         SmtpOutMsg *pMsg = IO->Data;
 968         FinalizeMessageSend(pMsg);
 969         return eAbort;
 970 }
 971 eNextState SMTP_C_Timeout(AsyncIO *IO)
 972 {
 973         CtdlLogPrintf(CTDL_DEBUG, "SMTP: %s\n", __FUNCTION__);
 974         SmtpOutMsg *pMsg = IO->Data;
 975         StrBufPlain(IO->ErrMsg, CKEY(ReadErrors[pMsg->State]));
 976         FinalizeMessageSend(pMsg);
 977         return eAbort;
 978 }
 979 eNextState SMTP_C_ConnFail(AsyncIO *IO)
 980 {
 981         CtdlLogPrintf(CTDL_DEBUG, "SMTP: %s\n", __FUNCTION__);
 982         SmtpOutMsg *pMsg = IO->Data;
 983         FinalizeMessageSend(pMsg);
 984         return eAbort;
 985 }
 986
 987
 988 /**
 989  * @brief lineread Handler; understands when to read more SMTP lines, and when this is a one-lined reply.
 990  */
 991 eReadState SMTP_C_ReadServerStatus(AsyncIO *IO)
 992 {
 993         eReadState Finished = eBufferNotEmpty;
 994
 995         while (Finished == eBufferNotEmpty) {
 996                 Finished = StrBufChunkSipLine(IO->IOBuf, &IO->RecvBuf);
 997
 998                 switch (Finished) {
 999                 case eMustReadMore: /// read new from socket...
1000                         return Finished;
1001                         break;
1002                 case eBufferNotEmpty: /* shouldn't happen... */
1003                 case eReadSuccess: /// done for now...
1004                         if (StrLength(IO->IOBuf) < 4)
1005                                 continue;
1006                         if (ChrPtr(IO->IOBuf)[3] == '-')
1007                                 Finished = eBufferNotEmpty;
1008                         else
1009                                 return Finished;
1010                         break;
1011                 case eReadFail: /// WHUT?
1012                         ///todo: shut down!
1013                         break;
1014                 }
1015         }
1016         return Finished;
1017 }
1018
1019 #endif
1020 CTDL_MODULE_INIT(smtp_eventclient)
1021 {
1022         return "smtpeventclient";
1023 }