citadel/event_client.c

   1 /*
   2  *
   3  * Copyright (c) 1998-2009 by the citadel.org team
   4  *
   5  *  This program is free software; you can redistribute it and/or modify
   6  *  it under the terms of the GNU General Public License as published by
   7  *  the Free Software Foundation; either version 3 of the License, or
   8  *  (at your option) any later version.
   9  *
  10  *  This program is distributed in the hope that it will be useful,
  11  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  *  GNU General Public License for more details.
  14  *
  15  *  You should have received a copy of the GNU General Public License
  16  *  along with this program; if not, write to the Free Software
  17  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  18  */
  19
  20 #include "sysdep.h"
  21 #include <stdlib.h>
  22 #include <unistd.h>
  23 #include <stdio.h>
  24 #include <termios.h>
  25 #include <fcntl.h>
  26 #include <signal.h>
  27 #include <pwd.h>
  28 #include <errno.h>
  29 #include <sys/types.h>
  30 #include <syslog.h>
  31
  32 #if TIME_WITH_SYS_TIME
  33 # include <sys/time.h>
  34 # include <time.h>
  35 #else
  36 # if HAVE_SYS_TIME_H
  37 #  include <sys/time.h>
  38 # else
  39 #  include <time.h>
  40 # endif
  41 #endif
  42 #include <sys/wait.h>
  43 #include <ctype.h>
  44 #include <string.h>
  45 #include <limits.h>
  46 #include <sys/socket.h>
  47 #include <netinet/in.h>
  48 #include <arpa/inet.h>
  49 #include <assert.h>
  50
  51 #include <libcitadel.h>
  52 #include "citadel.h"
  53 #include "server.h"
  54 #include "citserver.h"
  55 #include "support.h"
  56 #include "config.h"
  57 #include "control.h"
  58 #include "user_ops.h"
  59 #include "database.h"
  60 #include "msgbase.h"
  61 #include "internet_addressing.h"
  62 #include "genstamp.h"
  63 #include "domain.h"
  64 #include "clientsocket.h"
  65 #include "locate_host.h"
  66 #include "citadel_dirs.h"
  67
  68 #include "event_client.h"
  69
  70 static void IO_abort_shutdown_callback(struct ev_loop *loop, ev_cleanup *watcher, int revents)
  71 {
  72         syslog(LOG_DEBUG, "EVENT Q: %s\n", __FUNCTION__);
  73
  74         AsyncIO *IO = watcher->data;
  75         assert(IO->ShutdownAbort);
  76         IO->ShutdownAbort(IO);
  77 }
  78
  79
  80 /*--------------------------------------------------------------------------------
  81  * Server DB IO
  82  */
  83 extern int evdb_count;
  84 extern pthread_mutex_t DBEventQueueMutex;
  85 extern HashList *DBInboundEventQueue;
  86 extern struct ev_loop *event_db;
  87 extern ev_async DBAddJob;
  88 extern ev_async DBExitEventLoop;
  89
  90 eNextState QueueDBOperation(AsyncIO *IO, IO_CallBack CB)
  91 {
  92         IOAddHandler *h;
  93         int i;
  94
  95         h = (IOAddHandler*)malloc(sizeof(IOAddHandler));
  96         h->IO = IO;
  97         h->EvAttch = CB;
  98         ev_cleanup_init(&IO->db_abort_by_shutdown,
  99                         IO_abort_shutdown_callback);
 100         IO->db_abort_by_shutdown.data = IO;
 101         ev_cleanup_start(event_db, &IO->db_abort_by_shutdown);
 102
 103         pthread_mutex_lock(&DBEventQueueMutex);
 104         syslog(LOG_DEBUG, "DBEVENT Q\n");
 105         i = ++evdb_count ;
 106         Put(DBInboundEventQueue, IKEY(i), h, NULL);
 107         pthread_mutex_unlock(&DBEventQueueMutex);
 108
 109         ev_async_send (event_db, &DBAddJob);
 110         syslog(LOG_DEBUG, "DBEVENT Q Done.\n");
 111         return eDBQuery;
 112 }
 113
 114 void ShutDownDBCLient(AsyncIO *IO)
 115 {
 116         CitContext *Ctx =IO->CitContext;
 117         become_session(Ctx);
 118
 119         syslog(LOG_DEBUG, "DBEVENT\n");
 120         ev_cleanup_stop(event_db, &IO->db_abort_by_shutdown);
 121
 122         assert(IO->Terminate);
 123         IO->Terminate(IO);
 124
 125         Ctx->state = CON_IDLE;
 126         Ctx->kill_me = 1;
 127 }
 128
 129 void
 130 DB_PerformNext(struct ev_loop *loop, ev_idle *watcher, int revents)
 131 {
 132         AsyncIO *IO = watcher->data;
 133         syslog(LOG_DEBUG, "event: %s\n", __FUNCTION__);
 134         become_session(IO->CitContext);
 135
 136         ev_idle_stop(event_db, &IO->db_unwind_stack);
 137
 138         assert(IO->NextDBOperation);
 139         switch (IO->NextDBOperation(IO))
 140         {
 141         case eDBQuery:
 142                 break;
 143         case eSendDNSQuery:
 144         case eReadDNSReply:
 145         case eConnect:
 146         case eSendReply:
 147         case eSendMore:
 148         case eSendFile:
 149         case eReadMessage:
 150         case eReadMore:
 151         case eReadPayload:
 152         case eReadFile:
 153                 ev_cleanup_stop(loop, &IO->db_abort_by_shutdown);
 154                 break;
 155         case eTerminateConnection:
 156         case eAbort:
 157             ShutDownDBCLient(IO);
 158         }
 159 }
 160
 161 eNextState NextDBOperation(AsyncIO *IO, IO_CallBack CB)
 162 {
 163         IO->NextDBOperation = CB;
 164         ev_idle_init(&IO->db_unwind_stack,
 165                      DB_PerformNext);
 166         IO->db_unwind_stack.data = IO;
 167         ev_idle_start(event_db, &IO->db_unwind_stack);
 168         return eDBQuery;
 169 }
 170
 171 /*--------------------------------------------------------------------------------
 172  * Client IO
 173  */
 174 extern int evbase_count;
 175 extern pthread_mutex_t EventQueueMutex;
 176 extern HashList *InboundEventQueue;
 177 extern struct ev_loop *event_base;
 178 extern ev_async AddJob;
 179 extern ev_async ExitEventLoop;
 180
 181
 182 eNextState QueueEventContext(AsyncIO *IO, IO_CallBack CB)
 183 {
 184         IOAddHandler *h;
 185         int i;
 186
 187         h = (IOAddHandler*)malloc(sizeof(IOAddHandler));
 188         h->IO = IO;
 189         h->EvAttch = CB;
 190         ev_cleanup_init(&IO->abort_by_shutdown,
 191                         IO_abort_shutdown_callback);
 192         IO->abort_by_shutdown.data = IO;
 193         ev_cleanup_start(event_base, &IO->abort_by_shutdown);
 194
 195         pthread_mutex_lock(&EventQueueMutex);
 196         syslog(LOG_DEBUG, "EVENT Q\n");
 197         i = ++evbase_count;
 198         Put(InboundEventQueue, IKEY(i), h, NULL);
 199         pthread_mutex_unlock(&EventQueueMutex);
 200
 201         ev_async_send (event_base, &AddJob);
 202         syslog(LOG_DEBUG, "EVENT Q Done.\n");
 203         return eSendReply;
 204 }
 205
 206 extern eNextState evcurl_handle_start(AsyncIO *IO);
 207
 208 eNextState QueueCurlContext(AsyncIO *IO)
 209 {
 210         IOAddHandler *h;
 211         int i;
 212
 213         h = (IOAddHandler*)malloc(sizeof(IOAddHandler));
 214         h->IO = IO;
 215         h->EvAttch = evcurl_handle_start;
 216
 217         pthread_mutex_lock(&EventQueueMutex);
 218         syslog(LOG_DEBUG, "EVENT Q\n");
 219         i = ++evbase_count;
 220         Put(InboundEventQueue, IKEY(i), h, NULL);
 221         pthread_mutex_unlock(&EventQueueMutex);
 222
 223         ev_async_send (event_base, &AddJob);
 224         syslog(LOG_DEBUG, "EVENT Q Done.\n");
 225         return eSendReply;
 226 }
 227
 228 int ShutDownEventQueue(void)
 229 {
 230         pthread_mutex_lock(&DBEventQueueMutex);
 231         ev_async_send (event_db, &DBExitEventLoop);
 232         pthread_mutex_unlock(&DBEventQueueMutex);
 233
 234         pthread_mutex_lock(&EventQueueMutex);
 235         ev_async_send (EV_DEFAULT_ &ExitEventLoop);
 236         pthread_mutex_unlock(&EventQueueMutex);
 237         return 0;
 238 }
 239
 240 void FreeAsyncIOContents(AsyncIO *IO)
 241 {
 242         FreeStrBuf(&IO->IOBuf);
 243         FreeStrBuf(&IO->SendBuf.Buf);
 244         FreeStrBuf(&IO->RecvBuf.Buf);
 245 }
 246
 247
 248 void StopClientWatchers(AsyncIO *IO)
 249 {
 250         ev_timer_stop(event_base, &IO->conn_fail);
 251         ev_io_stop(event_base, &IO->conn_event);
 252         ev_idle_stop(event_base, &IO->unwind_stack);
 253
 254         ev_io_stop(event_base, &IO->send_event);
 255         ev_io_stop(event_base, &IO->recv_event);
 256         ev_timer_stop (event_base, &IO->rw_timeout);
 257         close(IO->SendBuf.fd);
 258         IO->SendBuf.fd = 0;
 259         IO->RecvBuf.fd = 0;
 260 }
 261
 262 void ShutDownCLient(AsyncIO *IO)
 263 {
 264         CitContext *Ctx =IO->CitContext;
 265         become_session(Ctx);
 266
 267         syslog(LOG_DEBUG, "EVENT x %d\n", IO->SendBuf.fd);
 268
 269         ev_cleanup_stop(event_base, &IO->abort_by_shutdown);
 270         StopClientWatchers(IO);
 271
 272         if (IO->DNSChannel != NULL) {
 273                 ares_destroy(IO->DNSChannel);
 274                 ev_io_stop(event_base, &IO->dns_recv_event);
 275                 ev_io_stop(event_base, &IO->dns_send_event);
 276                 IO->DNSChannel = NULL;
 277         }
 278         assert(IO->Terminate);
 279         IO->Terminate(IO);
 280         Ctx->state = CON_IDLE;
 281         Ctx->kill_me = 1;
 282 }
 283
 284
 285 eReadState HandleInbound(AsyncIO *IO)
 286 {
 287         const char *Err = NULL;
 288         eReadState Finished = eBufferNotEmpty;
 289
 290         become_session(IO->CitContext);
 291
 292         while ((Finished == eBufferNotEmpty) &&
 293                ((IO->NextState == eReadMessage)||
 294                 (IO->NextState == eReadMore)||
 295                 (IO->NextState == eReadFile)||
 296                 (IO->NextState == eReadPayload)))
 297         {
 298                 if (IO->RecvBuf.nBlobBytesWanted != 0) {
 299
 300                 }
 301                 else { /* Reading lines... */
 302 //// lex line reply in callback, or do it ourselves. as nnn-blabla means continue reading in SMTP
 303                         if ((IO->NextState == eReadFile) &&
 304                             (Finished == eBufferNotEmpty))
 305                         {
 306                                 Finished = WriteIOBAlreadyRead(&IO->IOB, &Err);
 307                                 if (Finished == eReadSuccess)
 308                                 {
 309                                         IO->NextState = eSendReply;
 310                                 }
 311                         }
 312                         else if (IO->LineReader)
 313                                 Finished = IO->LineReader(IO);
 314                         else
 315                                 Finished = StrBufChunkSipLine(IO->IOBuf, &IO->RecvBuf);
 316
 317                         switch (Finished) {
 318                         case eMustReadMore: /// read new from socket...
 319                                 break;
 320                         case eBufferNotEmpty: /* shouldn't happen... */
 321                         case eReadSuccess: /// done for now...
 322                                 break;
 323                         case eReadFail: /// WHUT?
 324                                 ///todo: shut down!
 325                                 break;
 326                         }
 327
 328                 }
 329
 330                 if (Finished != eMustReadMore) {
 331                         assert(IO->ReadDone);
 332                         ev_io_stop(event_base, &IO->recv_event);
 333                         IO->NextState = IO->ReadDone(IO);
 334                         Finished = StrBufCheckBuffer(&IO->RecvBuf);
 335                 }
 336         }
 337
 338         switch (IO->NextState) {
 339         case eSendFile:
 340                 ev_io_start(event_base, &IO->send_event);
 341                 break;
 342         case eSendReply:
 343         case eSendMore:
 344                 assert(IO->SendDone);
 345                 IO->NextState = IO->SendDone(IO);
 346                 ev_io_start(event_base, &IO->send_event);
 347                 break;
 348         case eReadPayload:
 349         case eReadMore:
 350         case eReadFile:
 351                 ev_io_start(event_base, &IO->recv_event);
 352                 break;
 353         case eTerminateConnection:
 354 //////TODOxxxx
 355                 break;
 356         case eAbort:
 357                 ShutDownCLient(IO);
 358                 break;
 359         case eSendDNSQuery:
 360         case eReadDNSReply:
 361         case eDBQuery:
 362         case eConnect:
 363         case eReadMessage:
 364                 break;
 365         }
 366         return Finished;
 367 }
 368
 369
 370 static void
 371 IO_send_callback(struct ev_loop *loop, ev_io *watcher, int revents)
 372 {
 373         int rc;
 374         AsyncIO *IO = watcher->data;
 375         const char *errmsg = NULL;
 376
 377         become_session(IO->CitContext);
 378 #ifdef BIGBAD_IODBG
 379         {
 380                 int rv = 0;
 381                 char fn [SIZ];
 382                 FILE *fd;
 383                 const char *pch = ChrPtr(IO->SendBuf.Buf);
 384                 const char *pchh = IO->SendBuf.ReadWritePointer;
 385                 long nbytes;
 386
 387                 if (pchh == NULL)
 388                         pchh = pch;
 389
 390                 nbytes = StrLength(IO->SendBuf.Buf) - (pchh - pch);
 391                 snprintf(fn, SIZ, "/tmp/foolog_ev_%s.%d",
 392                          ((CitContext*)(IO->CitContext))->ServiceName,
 393                          IO->SendBuf.fd);
 394
 395                 fd = fopen(fn, "a+");
 396                 fprintf(fd, "Send: BufSize: %ld BufContent: [",
 397                         nbytes);
 398                 rv = fwrite(pchh, nbytes, 1, fd);
 399                 if (!rv) printf("failed to write debug to %s!\n", fn);
 400                 fprintf(fd, "]\n");
 401 #endif
 402                 switch (IO->NextState) {
 403                 case eSendFile:
 404                         rc = FileSendChunked(&IO->IOB, &errmsg);
 405                         if (rc < 0)
 406                                 StrBufPlain(IO->ErrMsg, errmsg, -1);
 407                         break;
 408                 default:
 409                         rc = StrBuf_write_one_chunk_callback(watcher->fd, 0/*TODO*/, &IO->SendBuf);
 410                 }
 411
 412 #ifdef BIGBAD_IODBG
 413                 fprintf(fd, "Sent: BufSize: %d bytes.\n", rc);
 414                 fclose(fd);
 415         }
 416 #endif
 417         if (rc == 0)
 418         {
 419                 ev_io_stop(event_base, &IO->send_event);
 420                 switch (IO->NextState) {
 421                 case eSendMore:
 422                         assert(IO->SendDone);
 423                         IO->NextState = IO->SendDone(IO);
 424
 425                         if ((IO->NextState == eTerminateConnection) ||
 426                             (IO->NextState == eAbort) )
 427                                 ShutDownCLient(IO);
 428                         else {
 429                                 ev_io_start(event_base, &IO->send_event);
 430                         }
 431                         break;
 432                 case eSendFile:
 433                         if (IO->IOB.ChunkSendRemain > 0) {
 434                                 ev_io_start(event_base, &IO->recv_event);
 435                         } else {
 436                                 assert(IO->ReadDone);
 437                                 IO->NextState = IO->ReadDone(IO);
 438                                 switch(IO->NextState) {
 439                                 case eSendDNSQuery:
 440                                 case eReadDNSReply:
 441                                 case eDBQuery:
 442                                 case eConnect:
 443                                         break;
 444                                 case eSendReply:
 445                                 case eSendMore:
 446                                 case eSendFile:
 447                                         ev_io_start(event_base, &IO->send_event);
 448                                         break;
 449                                 case eReadMessage:
 450                                 case eReadMore:
 451                                 case eReadPayload:
 452                                 case eReadFile:
 453                                         break;
 454                                 case eTerminateConnection:
 455                                 case eAbort:
 456                                         break;
 457                                 }
 458                         }
 459                         break;
 460                 case eSendReply:
 461                     if (StrBufCheckBuffer(&IO->SendBuf) != eReadSuccess)
 462                         break;
 463                     IO->NextState = eReadMore;
 464                 case eReadMore:
 465                 case eReadMessage:
 466                 case eReadPayload:
 467                 case eReadFile:
 468                         if (StrBufCheckBuffer(&IO->RecvBuf) == eBufferNotEmpty) {
 469                                 HandleInbound(IO);
 470                         }
 471                         else {
 472                                 ev_io_start(event_base, &IO->recv_event);
 473                         }
 474
 475                         break;
 476                 case eDBQuery:
 477                         /* we now live in another queue, so we have to unregister. */
 478                         ev_cleanup_stop(loop, &IO->abort_by_shutdown);
 479                         break;
 480                 case eSendDNSQuery:
 481                 case eReadDNSReply:
 482                 case eConnect:
 483                 case eTerminateConnection:
 484                 case eAbort:
 485                         break;
 486                 }
 487         }
 488         else if (rc < 0) {
 489                 assert(IO->Timeout);
 490                 IO->Timeout(IO);
 491         }
 492         /* else : must write more. */
 493 }
 494 static void
 495 set_start_callback(struct ev_loop *loop, AsyncIO *IO, int revents)
 496 {
 497
 498         switch(IO->NextState) {
 499         case eReadMore:
 500         case eReadMessage:
 501         case eReadFile:
 502                 ev_io_start(event_base, &IO->recv_event);
 503                 break;
 504         case eSendReply:
 505         case eSendMore:
 506         case eReadPayload:
 507         case eSendFile:
 508                 become_session(IO->CitContext);
 509                 IO_send_callback(loop, &IO->send_event, revents);
 510                 break;
 511         case eDBQuery:
 512         case eSendDNSQuery:
 513         case eReadDNSReply:
 514         case eConnect:
 515         case eTerminateConnection:
 516         case eAbort:
 517                 /// TODO: WHUT?
 518                 break;
 519         }
 520 }
 521
 522 static void
 523 IO_Timeout_callback(struct ev_loop *loop, ev_timer *watcher, int revents)
 524 {
 525         AsyncIO *IO = watcher->data;
 526
 527         ev_timer_stop (event_base, &IO->rw_timeout);
 528         become_session(IO->CitContext);
 529
 530         if (IO->SendBuf.fd != 0)
 531         {
 532                 ev_io_stop(event_base, &IO->send_event);
 533                 ev_io_stop(event_base, &IO->recv_event);
 534                 ev_timer_stop (event_base, &IO->rw_timeout);
 535                 close(IO->SendBuf.fd);
 536                 IO->SendBuf.fd = IO->RecvBuf.fd = 0;
 537         }
 538
 539         assert(IO->Timeout);
 540         switch (IO->Timeout(IO))
 541         {
 542         case eAbort:
 543                 ShutDownCLient(IO);
 544         default:
 545                 break;
 546         }
 547 }
 548
 549 static void
 550 IO_connfail_callback(struct ev_loop *loop, ev_timer *watcher, int revents)
 551 {
 552         AsyncIO *IO = watcher->data;
 553
 554         ev_timer_stop (event_base, &IO->conn_fail);
 555
 556         if (IO->SendBuf.fd != 0)
 557         {
 558                 ev_io_stop(loop, &IO->conn_event);
 559                 ev_io_stop(event_base, &IO->send_event);
 560                 ev_io_stop(event_base, &IO->recv_event);
 561                 ev_timer_stop (event_base, &IO->rw_timeout);
 562                 close(IO->SendBuf.fd);
 563                 IO->SendBuf.fd = IO->RecvBuf.fd = 0;
 564         }
 565         become_session(IO->CitContext);
 566
 567         assert(IO->ConnFail);
 568         switch (IO->ConnFail(IO))
 569         {
 570         case eAbort:
 571                 ShutDownCLient(IO);
 572         default:
 573                 break;
 574
 575         }
 576 }
 577
 578 static void
 579 IO_connfailimmediate_callback(struct ev_loop *loop, ev_idle *watcher, int revents)
 580 {
 581         AsyncIO *IO = watcher->data;
 582
 583         ev_idle_stop (event_base, &IO->conn_fail_immediate);
 584
 585         if (IO->SendBuf.fd != 0)
 586         {
 587                 close(IO->SendBuf.fd);
 588                 IO->SendBuf.fd = IO->RecvBuf.fd = 0;
 589         }
 590         become_session(IO->CitContext);
 591
 592         assert(IO->ConnFail);
 593         switch (IO->ConnFail(IO))
 594         {
 595         case eAbort:
 596                 ShutDownCLient(IO);
 597         default:
 598                 break;
 599
 600         }
 601 }
 602
 603 static void
 604 IO_connestd_callback(struct ev_loop *loop, ev_io *watcher, int revents)
 605 {
 606         AsyncIO *IO = watcher->data;
 607
 608         ev_io_stop(loop, &IO->conn_event);
 609         ev_timer_stop (event_base, &IO->conn_fail);
 610         set_start_callback(loop, IO, revents);
 611 }
 612 static void
 613 IO_recv_callback(struct ev_loop *loop, ev_io *watcher, int revents)
 614 {
 615         const char *errmsg;
 616         ssize_t nbytes;
 617         AsyncIO *IO = watcher->data;
 618
 619         switch (IO->NextState) {
 620         case eReadFile:
 621                 nbytes = FileRecvChunked(&IO->IOB, &errmsg);
 622                 if (nbytes < 0)
 623                         StrBufPlain(IO->ErrMsg, errmsg, -1);
 624                 else
 625                 {
 626                         if (IO->IOB.ChunkSendRemain == 0)
 627                         {
 628                                 IO->NextState = eSendReply;
 629                         }
 630                         else
 631                                 return;
 632                 }
 633                 break;
 634         default:
 635                 nbytes = StrBuf_read_one_chunk_callback(watcher->fd, 0 /*TODO */, &IO->RecvBuf);
 636                 break;
 637         }
 638
 639 #ifdef BIGBAD_IODBG
 640         {
 641                 int rv = 0;
 642                 char fn [SIZ];
 643                 FILE *fd;
 644                 const char *pch = ChrPtr(IO->RecvBuf.Buf);
 645                 const char *pchh = IO->RecvBuf.ReadWritePointer;
 646                 long nbytes;
 647
 648                 if (pchh == NULL)
 649                         pchh = pch;
 650
 651                 nbytes = StrLength(IO->RecvBuf.Buf) - (pchh - pch);
 652                 snprintf(fn, SIZ, "/tmp/foolog_ev_%s.%d",
 653                          ((CitContext*)(IO->CitContext))->ServiceName,
 654                          IO->SendBuf.fd);
 655
 656                 fd = fopen(fn, "a+");
 657                 fprintf(fd, "Read: BufSize: %ld BufContent: [",
 658                         nbytes);
 659                 rv = fwrite(pchh, nbytes, 1, fd);
 660                 if (!rv) printf("failed to write debug to %s!\n", fn);
 661                 fprintf(fd, "]\n");
 662
 663
 664                 fclose(fd);
 665         }
 666 #endif
 667         if (nbytes > 0) {
 668                 HandleInbound(IO);
 669         } else if (nbytes == 0) {
 670                 assert(IO->Timeout);
 671
 672                 switch (IO->Timeout(IO))
 673                 {
 674                 case eAbort:
 675                         ShutDownCLient(IO);
 676                 default:
 677                         break;
 678                 }
 679                 return;
 680         } else if (nbytes == -1) {
 681 /// TODO: FD is gone. kick it.        sock_buff_invoke_free(sb, errno);
 682                 syslog(LOG_DEBUG,
 683                        "EVENT: Socket Invalid! %s \n",
 684                        strerror(errno));
 685                 ShutDownCLient(IO);
 686                 return;
 687         }
 688 }
 689
 690 void
 691 IO_postdns_callback(struct ev_loop *loop, ev_idle *watcher, int revents)
 692 {
 693         AsyncIO *IO = watcher->data;
 694         syslog(LOG_DEBUG, "event: %s\n", __FUNCTION__);
 695         become_session(IO->CitContext);
 696         assert(IO->DNSFail);
 697         assert(IO->DNSQuery->PostDNS);
 698         switch (IO->DNSQuery->PostDNS(IO))
 699         {
 700         case eAbort:
 701                 IO->DNSFail(IO);
 702         default:
 703             break;
 704         }
 705 }
 706
 707 eNextState event_connect_socket(AsyncIO *IO, double conn_timeout, double first_rw_timeout)
 708 {
 709         int fdflags;
 710         int rc = -1;
 711
 712         IO->SendBuf.fd = IO->RecvBuf.fd =
 713                 socket(
 714                         (IO->ConnectMe->IPv6)?PF_INET6:PF_INET,
 715                         SOCK_STREAM,
 716                         IPPROTO_TCP);
 717
 718         if (IO->SendBuf.fd < 0) {
 719                 syslog(LOG_ERR, "EVENT: socket() failed: %s\n", strerror(errno));
 720                 StrBufPrintf(IO->ErrMsg, "Failed to create socket: %s", strerror(errno));
 721                 return eAbort;
 722         }
 723         fdflags = fcntl(IO->SendBuf.fd, F_GETFL);
 724         if (fdflags < 0) {
 725                 syslog(LOG_DEBUG,
 726                        "EVENT: unable to get socket flags! %s \n",
 727                        strerror(errno));
 728                 StrBufPrintf(IO->ErrMsg, "Failed to get socket flags: %s", strerror(errno));
 729                 return eAbort;
 730         }
 731         fdflags = fdflags | O_NONBLOCK;
 732         if (fcntl(IO->SendBuf.fd, F_SETFL, fdflags) < 0) {
 733                 syslog(LOG_DEBUG,
 734                        "EVENT: unable to set socket nonblocking flags! %s \n",
 735                        strerror(errno));
 736                 StrBufPrintf(IO->ErrMsg, "Failed to set socket flags: %s", strerror(errno));
 737                 close(IO->SendBuf.fd);
 738                 IO->SendBuf.fd = IO->RecvBuf.fd = -1;
 739                 return eAbort;
 740         }
 741 /* TODO: maye we could use offsetof() to calc the position of data...
 742  * http://doc.dvgu.ru/devel/ev.html#associating_custom_data_with_a_watcher
 743  */
 744         ev_io_init(&IO->recv_event, IO_recv_callback, IO->RecvBuf.fd, EV_READ);
 745         IO->recv_event.data = IO;
 746         ev_io_init(&IO->send_event, IO_send_callback, IO->SendBuf.fd, EV_WRITE);
 747         IO->send_event.data = IO;
 748
 749         ev_timer_init(&IO->conn_fail, IO_connfail_callback, conn_timeout, 0);
 750         IO->conn_fail.data = IO;
 751         ev_timer_init(&IO->rw_timeout, IO_Timeout_callback, first_rw_timeout, 0);
 752         IO->rw_timeout.data = IO;
 753
 754
 755         /*  Bypass it like this: IO->Addr.sin_addr.s_addr = inet_addr("127.0.0.1"); */
 756 ///     ((struct sockaddr_in)IO->ConnectMe->Addr).sin_addr.s_addr = inet_addr("127.0.0.1");
 757         if (IO->ConnectMe->IPv6)
 758                 rc = connect(IO->SendBuf.fd, &IO->ConnectMe->Addr, sizeof(struct sockaddr_in6));
 759         else
 760                 rc = connect(IO->SendBuf.fd, (struct sockaddr_in *)&IO->ConnectMe->Addr, sizeof(struct sockaddr_in));
 761
 762         if (rc >= 0){
 763                 syslog(LOG_DEBUG, "connect() immediate success.\n");
 764                 set_start_callback(event_base, IO, 0);
 765                 ev_timer_start(event_base, &IO->rw_timeout);
 766                 return IO->NextState;
 767         }
 768         else if (errno == EINPROGRESS) {
 769                 syslog(LOG_DEBUG, "connect() have to wait now.\n");
 770
 771                 ev_io_init(&IO->conn_event, IO_connestd_callback, IO->SendBuf.fd, EV_READ|EV_WRITE);
 772                 IO->conn_event.data = IO;
 773
 774                 ev_io_start(event_base, &IO->conn_event);
 775                 ev_timer_start(event_base, &IO->conn_fail);
 776                 return IO->NextState;
 777         }
 778         else {
 779                 ev_idle_init(&IO->conn_fail_immediate,
 780                              IO_connfailimmediate_callback);
 781                 IO->conn_fail_immediate.data = IO;
 782                 ev_idle_start(event_base, &IO->conn_fail_immediate);
 783
 784                 syslog(LOG_ERR, "connect() failed: %s\n", strerror(errno));
 785                 StrBufPrintf(IO->ErrMsg, "Failed to connect: %s", strerror(errno));
 786                 return IO->NextState;
 787         }
 788         return IO->NextState;
 789 }
 790
 791 void SetNextTimeout(AsyncIO *IO, double timeout)
 792 {
 793         IO->rw_timeout.repeat = timeout;
 794         ev_timer_again (event_base,  &IO->rw_timeout);
 795 }
 796
 797 eNextState InitEventIO(AsyncIO *IO,
 798                        void *pData,
 799                        double conn_timeout,
 800                        double first_rw_timeout,
 801                        int ReadFirst)
 802 {
 803         IO->Data = pData;
 804         become_session(IO->CitContext);
 805
 806         if (ReadFirst) {
 807                 IO->NextState = eReadMessage;
 808         }
 809         else {
 810                 IO->NextState = eSendReply;
 811         }
 812         return event_connect_socket(IO, conn_timeout, first_rw_timeout);
 813 }
 814
 815 eNextState ReAttachIO(AsyncIO *IO,
 816                       void *pData,
 817                       int ReadFirst)
 818 {
 819         IO->Data = pData;
 820         become_session(IO->CitContext);
 821         ev_cleanup_start(event_base, &IO->abort_by_shutdown);
 822         if (ReadFirst) {
 823                 IO->NextState = eReadMessage;
 824         }
 825         else {
 826                 IO->NextState = eSendReply;
 827         }
 828         set_start_callback(event_base, IO, 0);
 829
 830         return IO->NextState;
 831 }