citadel/event_client.c

   1 /*
   2  *
   3  * Copyright (c) 1998-2009 by the citadel.org team
   4  *
   5  *  This program is open source 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         AsyncIO *IO = watcher->data;
  73         EV_syslog(LOG_DEBUG, "EVENT Q: %s\n", __FUNCTION__);
  74
  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         EVM_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         EVM_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         EVM_syslog(LOG_DEBUG, "DBEVENT Terminating.\n");
 120         ev_cleanup_stop(event_db, &IO->db_abort_by_shutdown);
 121
 122         assert(IO->Terminate);
 123         IO->Terminate(IO);
 124 }
 125
 126 void
 127 DB_PerformNext(struct ev_loop *loop, ev_idle *watcher, int revents)
 128 {
 129         AsyncIO *IO = watcher->data;
 130         EV_syslog(LOG_DEBUG, "event: %s\n", __FUNCTION__);
 131         become_session(IO->CitContext);
 132
 133         ev_idle_stop(event_db, &IO->db_unwind_stack);
 134
 135         assert(IO->NextDBOperation);
 136         switch (IO->NextDBOperation(IO))
 137         {
 138         case eDBQuery:
 139                 break;
 140         case eSendDNSQuery:
 141         case eReadDNSReply:
 142         case eConnect:
 143         case eSendReply:
 144         case eSendMore:
 145         case eSendFile:
 146         case eReadMessage:
 147         case eReadMore:
 148         case eReadPayload:
 149         case eReadFile:
 150                 ev_cleanup_stop(loop, &IO->db_abort_by_shutdown);
 151                 break;
 152         case eTerminateConnection:
 153         case eAbort:
 154                 ev_idle_stop(event_db, &IO->db_unwind_stack);
 155                 ev_cleanup_stop(loop, &IO->db_abort_by_shutdown);
 156                 ShutDownDBCLient(IO);
 157         }
 158 }
 159
 160 eNextState NextDBOperation(AsyncIO *IO, IO_CallBack CB)
 161 {
 162         IO->NextDBOperation = CB;
 163         ev_idle_init(&IO->db_unwind_stack,
 164                      DB_PerformNext);
 165         IO->db_unwind_stack.data = IO;
 166         ev_idle_start(event_db, &IO->db_unwind_stack);
 167         return eDBQuery;
 168 }
 169
 170 /*--------------------------------------------------------------------------------
 171  * Client IO
 172  */
 173 extern int evbase_count;
 174 extern pthread_mutex_t EventQueueMutex;
 175 extern HashList *InboundEventQueue;
 176 extern struct ev_loop *event_base;
 177 extern ev_async AddJob;
 178 extern ev_async ExitEventLoop;
 179
 180
 181 eNextState QueueEventContext(AsyncIO *IO, IO_CallBack CB)
 182 {
 183         IOAddHandler *h;
 184         int i;
 185
 186         h = (IOAddHandler*)malloc(sizeof(IOAddHandler));
 187         h->IO = IO;
 188         h->EvAttch = CB;
 189         ev_cleanup_init(&IO->abort_by_shutdown,
 190                         IO_abort_shutdown_callback);
 191         IO->abort_by_shutdown.data = IO;
 192         ev_cleanup_start(event_base, &IO->abort_by_shutdown);
 193
 194         pthread_mutex_lock(&EventQueueMutex);
 195         EVM_syslog(LOG_DEBUG, "EVENT Q\n");
 196         i = ++evbase_count;
 197         Put(InboundEventQueue, IKEY(i), h, NULL);
 198         pthread_mutex_unlock(&EventQueueMutex);
 199
 200         ev_async_send (event_base, &AddJob);
 201         EVM_syslog(LOG_DEBUG, "EVENT Q Done.\n");
 202         return eSendReply;
 203 }
 204
 205 extern eNextState evcurl_handle_start(AsyncIO *IO);
 206
 207 eNextState QueueCurlContext(AsyncIO *IO)
 208 {
 209         IOAddHandler *h;
 210         int i;
 211
 212         h = (IOAddHandler*)malloc(sizeof(IOAddHandler));
 213         h->IO = IO;
 214         h->EvAttch = evcurl_handle_start;
 215
 216         pthread_mutex_lock(&EventQueueMutex);
 217         EVM_syslog(LOG_DEBUG, "EVENT Q\n");
 218         i = ++evbase_count;
 219         Put(InboundEventQueue, IKEY(i), h, NULL);
 220         pthread_mutex_unlock(&EventQueueMutex);
 221
 222         ev_async_send (event_base, &AddJob);
 223         EVM_syslog(LOG_DEBUG, "EVENT Q Done.\n");
 224         return eSendReply;
 225 }
 226
 227 void DestructCAres(AsyncIO *IO);
 228 void FreeAsyncIOContents(AsyncIO *IO)
 229 {
 230         CitContext *Ctx = IO->CitContext;
 231
 232         FreeStrBuf(&IO->IOBuf);
 233         FreeStrBuf(&IO->SendBuf.Buf);
 234         FreeStrBuf(&IO->RecvBuf.Buf);
 235
 236         DestructCAres(IO);
 237
 238         FreeURL(&IO->ConnectMe);
 239         FreeStrBuf(&IO->HttpReq.ReplyData);
 240
 241         Ctx->state = CON_IDLE;
 242         Ctx->kill_me = 1;
 243 }
 244
 245
 246 void StopClientWatchers(AsyncIO *IO)
 247 {
 248         ev_timer_stop (event_base, &IO->rw_timeout);
 249         ev_timer_stop(event_base, &IO->conn_fail);
 250         ev_idle_stop(event_base, &IO->unwind_stack);
 251
 252         ev_io_stop(event_base, &IO->conn_event);
 253         ev_io_stop(event_base, &IO->send_event);
 254         ev_io_stop(event_base, &IO->recv_event);
 255         close(IO->SendBuf.fd);
 256         IO->SendBuf.fd = 0;
 257         IO->RecvBuf.fd = 0;
 258 }
 259
 260 void ShutDownCLient(AsyncIO *IO)
 261 {
 262         CitContext *Ctx =IO->CitContext;
 263         become_session(Ctx);
 264
 265         EVM_syslog(LOG_DEBUG, "EVENT Terminating \n");
 266
 267         ev_cleanup_stop(event_base, &IO->abort_by_shutdown);
 268         StopClientWatchers(IO);
 269
 270         if (IO->DNS.Channel != NULL) {
 271                 ares_destroy(IO->DNS.Channel);
 272                 ev_io_stop(event_base, &IO->DNS.recv_event);
 273                 ev_io_stop(event_base, &IO->DNS.send_event);
 274                 IO->DNS.Channel = NULL;
 275         }
 276         assert(IO->Terminate);
 277         IO->Terminate(IO);
 278 }
 279
 280
 281 eReadState HandleInbound(AsyncIO *IO)
 282 {
 283         const char *Err = NULL;
 284         eReadState Finished = eBufferNotEmpty;
 285
 286         become_session(IO->CitContext);
 287
 288         while ((Finished == eBufferNotEmpty) &&
 289                ((IO->NextState == eReadMessage)||
 290                 (IO->NextState == eReadMore)||
 291                 (IO->NextState == eReadFile)||
 292                 (IO->NextState == eReadPayload)))
 293         {
 294                 if (IO->RecvBuf.nBlobBytesWanted != 0) {
 295
 296                 }
 297                 else { /* Reading lines... */
 298 //// lex line reply in callback, or do it ourselves. as nnn-blabla means continue reading in SMTP
 299                         if ((IO->NextState == eReadFile) &&
 300                             (Finished == eBufferNotEmpty))
 301                         {
 302                                 Finished = WriteIOBAlreadyRead(&IO->IOB, &Err);
 303                                 if (Finished == eReadSuccess)
 304                                 {
 305                                         IO->NextState = eSendReply;
 306                                 }
 307                         }
 308                         else if (IO->LineReader)
 309                                 Finished = IO->LineReader(IO);
 310                         else
 311                                 Finished = StrBufChunkSipLine(IO->IOBuf, &IO->RecvBuf);
 312
 313                         switch (Finished) {
 314                         case eMustReadMore: /// read new from socket...
 315                                 break;
 316                         case eBufferNotEmpty: /* shouldn't happen... */
 317                         case eReadSuccess: /// done for now...
 318                                 break;
 319                         case eReadFail: /// WHUT?
 320                                 ///todo: shut down!
 321                                 break;
 322                         }
 323
 324                 }
 325
 326                 if (Finished != eMustReadMore) {
 327                         assert(IO->ReadDone);
 328                         ev_io_stop(event_base, &IO->recv_event);
 329                         IO->NextState = IO->ReadDone(IO);
 330                         Finished = StrBufCheckBuffer(&IO->RecvBuf);
 331                 }
 332         }
 333
 334         switch (IO->NextState) {
 335         case eSendFile:
 336                 ev_io_start(event_base, &IO->send_event);
 337                 break;
 338         case eSendReply:
 339         case eSendMore:
 340                 assert(IO->SendDone);
 341                 IO->NextState = IO->SendDone(IO);
 342                 ev_io_start(event_base, &IO->send_event);
 343                 break;
 344         case eReadPayload:
 345         case eReadMore:
 346         case eReadFile:
 347                 ev_io_start(event_base, &IO->recv_event);
 348                 break;
 349         case eTerminateConnection:
 350 //////TODOxxxx
 351                 break;
 352         case eAbort:
 353                 ShutDownCLient(IO);
 354                 break;
 355         case eSendDNSQuery:
 356         case eReadDNSReply:
 357         case eDBQuery:
 358         case eConnect:
 359         case eReadMessage:
 360                 break;
 361         }
 362         return Finished;
 363 }
 364
 365
 366 static void
 367 IO_send_callback(struct ev_loop *loop, ev_io *watcher, int revents)
 368 {
 369         int rc;
 370         AsyncIO *IO = watcher->data;
 371         const char *errmsg = NULL;
 372
 373         become_session(IO->CitContext);
 374 #ifdef BIGBAD_IODBG
 375         {
 376                 int rv = 0;
 377                 char fn [SIZ];
 378                 FILE *fd;
 379                 const char *pch = ChrPtr(IO->SendBuf.Buf);
 380                 const char *pchh = IO->SendBuf.ReadWritePointer;
 381                 long nbytes;
 382
 383                 if (pchh == NULL)
 384                         pchh = pch;
 385
 386                 nbytes = StrLength(IO->SendBuf.Buf) - (pchh - pch);
 387                 snprintf(fn, SIZ, "/tmp/foolog_ev_%s.%d",
 388                          ((CitContext*)(IO->CitContext))->ServiceName,
 389                          IO->SendBuf.fd);
 390
 391                 fd = fopen(fn, "a+");
 392                 fprintf(fd, "Send: BufSize: %ld BufContent: [",
 393                         nbytes);
 394                 rv = fwrite(pchh, nbytes, 1, fd);
 395                 if (!rv) printf("failed to write debug to %s!\n", fn);
 396                 fprintf(fd, "]\n");
 397 #endif
 398                 switch (IO->NextState) {
 399                 case eSendFile:
 400                         rc = FileSendChunked(&IO->IOB, &errmsg);
 401                         if (rc < 0)
 402                                 StrBufPlain(IO->ErrMsg, errmsg, -1);
 403                         break;
 404                 default:
 405                         rc = StrBuf_write_one_chunk_callback(watcher->fd, 0/*TODO*/, &IO->SendBuf);
 406                 }
 407
 408 #ifdef BIGBAD_IODBG
 409                 fprintf(fd, "Sent: BufSize: %d bytes.\n", rc);
 410                 fclose(fd);
 411         }
 412 #endif
 413         if (rc == 0)
 414         {
 415                 ev_io_stop(event_base, &IO->send_event);
 416                 switch (IO->NextState) {
 417                 case eSendMore:
 418                         assert(IO->SendDone);
 419                         IO->NextState = IO->SendDone(IO);
 420
 421                         if ((IO->NextState == eTerminateConnection) ||
 422                             (IO->NextState == eAbort) )
 423                                 ShutDownCLient(IO);
 424                         else {
 425                                 ev_io_start(event_base, &IO->send_event);
 426                         }
 427                         break;
 428                 case eSendFile:
 429                         if (IO->IOB.ChunkSendRemain > 0) {
 430                                 ev_io_start(event_base, &IO->recv_event);
 431                         } else {
 432                                 assert(IO->ReadDone);
 433                                 IO->NextState = IO->ReadDone(IO);
 434                                 switch(IO->NextState) {
 435                                 case eSendDNSQuery:
 436                                 case eReadDNSReply:
 437                                 case eDBQuery:
 438                                 case eConnect:
 439                                         break;
 440                                 case eSendReply:
 441                                 case eSendMore:
 442                                 case eSendFile:
 443                                         ev_io_start(event_base, &IO->send_event);
 444                                         break;
 445                                 case eReadMessage:
 446                                 case eReadMore:
 447                                 case eReadPayload:
 448                                 case eReadFile:
 449                                         break;
 450                                 case eTerminateConnection:
 451                                 case eAbort:
 452                                         break;
 453                                 }
 454                         }
 455                         break;
 456                 case eSendReply:
 457                     if (StrBufCheckBuffer(&IO->SendBuf) != eReadSuccess)
 458                         break;
 459                     IO->NextState = eReadMore;
 460                 case eReadMore:
 461                 case eReadMessage:
 462                 case eReadPayload:
 463                 case eReadFile:
 464                         if (StrBufCheckBuffer(&IO->RecvBuf) == eBufferNotEmpty) {
 465                                 HandleInbound(IO);
 466                         }
 467                         else {
 468                                 ev_io_start(event_base, &IO->recv_event);
 469                         }
 470
 471                         break;
 472                 case eDBQuery:
 473                         /* we now live in another queue, so we have to unregister. */
 474                         ev_cleanup_stop(loop, &IO->abort_by_shutdown);
 475                         break;
 476                 case eSendDNSQuery:
 477                 case eReadDNSReply:
 478                 case eConnect:
 479                 case eTerminateConnection:
 480                 case eAbort:
 481                         break;
 482                 }
 483         }
 484         else if (rc < 0) {
 485                 assert(IO->Timeout);
 486                 IO->Timeout(IO);
 487         }
 488         /* else : must write more. */
 489 }
 490 static void
 491 set_start_callback(struct ev_loop *loop, AsyncIO *IO, int revents)
 492 {
 493
 494         switch(IO->NextState) {
 495         case eReadMore:
 496         case eReadMessage:
 497         case eReadFile:
 498                 ev_io_start(event_base, &IO->recv_event);
 499                 break;
 500         case eSendReply:
 501         case eSendMore:
 502         case eReadPayload:
 503         case eSendFile:
 504                 become_session(IO->CitContext);
 505                 IO_send_callback(loop, &IO->send_event, revents);
 506                 break;
 507         case eDBQuery:
 508         case eSendDNSQuery:
 509         case eReadDNSReply:
 510         case eConnect:
 511         case eTerminateConnection:
 512         case eAbort:
 513                 /// TODO: WHUT?
 514                 break;
 515         }
 516 }
 517
 518 static void
 519 IO_Timeout_callback(struct ev_loop *loop, ev_timer *watcher, int revents)
 520 {
 521         AsyncIO *IO = watcher->data;
 522
 523         ev_timer_stop (event_base, &IO->rw_timeout);
 524         become_session(IO->CitContext);
 525
 526         if (IO->SendBuf.fd != 0)
 527         {
 528                 ev_io_stop(event_base, &IO->send_event);
 529                 ev_io_stop(event_base, &IO->recv_event);
 530                 ev_timer_stop (event_base, &IO->rw_timeout);
 531                 close(IO->SendBuf.fd);
 532                 IO->SendBuf.fd = IO->RecvBuf.fd = 0;
 533         }
 534
 535         assert(IO->Timeout);
 536         switch (IO->Timeout(IO))
 537         {
 538         case eAbort:
 539                 ShutDownCLient(IO);
 540         default:
 541                 break;
 542         }
 543 }
 544
 545 static void
 546 IO_connfail_callback(struct ev_loop *loop, ev_timer *watcher, int revents)
 547 {
 548         AsyncIO *IO = watcher->data;
 549
 550         ev_timer_stop (event_base, &IO->conn_fail);
 551
 552         if (IO->SendBuf.fd != 0)
 553         {
 554                 ev_io_stop(loop, &IO->conn_event);
 555                 ev_io_stop(event_base, &IO->send_event);
 556                 ev_io_stop(event_base, &IO->recv_event);
 557                 ev_timer_stop (event_base, &IO->rw_timeout);
 558                 close(IO->SendBuf.fd);
 559                 IO->SendBuf.fd = IO->RecvBuf.fd = 0;
 560         }
 561         become_session(IO->CitContext);
 562
 563         assert(IO->ConnFail);
 564         switch (IO->ConnFail(IO))
 565         {
 566         case eAbort:
 567                 ShutDownCLient(IO);
 568         default:
 569                 break;
 570
 571         }
 572 }
 573
 574 static void
 575 IO_connfailimmediate_callback(struct ev_loop *loop, ev_idle *watcher, int revents)
 576 {
 577         AsyncIO *IO = watcher->data;
 578
 579         ev_idle_stop (event_base, &IO->conn_fail_immediate);
 580
 581         if (IO->SendBuf.fd != 0)
 582         {
 583                 close(IO->SendBuf.fd);
 584                 IO->SendBuf.fd = IO->RecvBuf.fd = 0;
 585         }
 586         become_session(IO->CitContext);
 587
 588         assert(IO->ConnFail);
 589         switch (IO->ConnFail(IO))
 590         {
 591         case eAbort:
 592                 ShutDownCLient(IO);
 593         default:
 594                 break;
 595
 596         }
 597 }
 598
 599 static void
 600 IO_connestd_callback(struct ev_loop *loop, ev_io *watcher, int revents)
 601 {
 602         AsyncIO *IO = watcher->data;
 603
 604         ev_io_stop(loop, &IO->conn_event);
 605         ev_timer_stop (event_base, &IO->conn_fail);
 606         set_start_callback(loop, IO, revents);
 607 }
 608 static void
 609 IO_recv_callback(struct ev_loop *loop, ev_io *watcher, int revents)
 610 {
 611         const char *errmsg;
 612         ssize_t nbytes;
 613         AsyncIO *IO = watcher->data;
 614
 615         switch (IO->NextState) {
 616         case eReadFile:
 617                 nbytes = FileRecvChunked(&IO->IOB, &errmsg);
 618                 if (nbytes < 0)
 619                         StrBufPlain(IO->ErrMsg, errmsg, -1);
 620                 else
 621                 {
 622                         if (IO->IOB.ChunkSendRemain == 0)
 623                         {
 624                                 IO->NextState = eSendReply;
 625                         }
 626                         else
 627                                 return;
 628                 }
 629                 break;
 630         default:
 631                 nbytes = StrBuf_read_one_chunk_callback(watcher->fd, 0 /*TODO */, &IO->RecvBuf);
 632                 break;
 633         }
 634
 635 #ifdef BIGBAD_IODBG
 636         {
 637                 int rv = 0;
 638                 char fn [SIZ];
 639                 FILE *fd;
 640                 const char *pch = ChrPtr(IO->RecvBuf.Buf);
 641                 const char *pchh = IO->RecvBuf.ReadWritePointer;
 642                 long nbytes;
 643
 644                 if (pchh == NULL)
 645                         pchh = pch;
 646
 647                 nbytes = StrLength(IO->RecvBuf.Buf) - (pchh - pch);
 648                 snprintf(fn, SIZ, "/tmp/foolog_ev_%s.%d",
 649                          ((CitContext*)(IO->CitContext))->ServiceName,
 650                          IO->SendBuf.fd);
 651
 652                 fd = fopen(fn, "a+");
 653                 fprintf(fd, "Read: BufSize: %ld BufContent: [",
 654                         nbytes);
 655                 rv = fwrite(pchh, nbytes, 1, fd);
 656                 if (!rv) printf("failed to write debug to %s!\n", fn);
 657                 fprintf(fd, "]\n");
 658
 659
 660                 fclose(fd);
 661         }
 662 #endif
 663         if (nbytes > 0) {
 664                 HandleInbound(IO);
 665         } else if (nbytes == 0) {
 666                 assert(IO->Timeout);
 667
 668                 switch (IO->Timeout(IO))
 669                 {
 670                 case eAbort:
 671                         ShutDownCLient(IO);
 672                 default:
 673                         break;
 674                 }
 675                 return;
 676         } else if (nbytes == -1) {
 677 /// TODO: FD is gone. kick it.        sock_buff_invoke_free(sb, errno);
 678                 EV_syslog(LOG_DEBUG,
 679                           "EVENT: Socket Invalid! %s \n",
 680                           strerror(errno));
 681                 ShutDownCLient(IO);
 682                 return;
 683         }
 684 }
 685
 686 void
 687 IO_postdns_callback(struct ev_loop *loop, ev_idle *watcher, int revents)
 688 {
 689         AsyncIO *IO = watcher->data;
 690         EV_syslog(LOG_DEBUG, "event: %s\n", __FUNCTION__);
 691         become_session(IO->CitContext);
 692         assert(IO->DNS.Fail);
 693         assert(IO->DNS.Query->PostDNS);
 694         switch (IO->DNS.Query->PostDNS(IO))
 695         {
 696         case eAbort:
 697                 switch (IO->DNS.Fail(IO)) {
 698                 case eAbort:
 699                         ShutDownCLient(IO);
 700                 default:
 701                         break;
 702                 }
 703         default:
 704                 break;
 705         }
 706 }
 707
 708
 709 eNextState EvConnectSock(AsyncIO *IO,
 710                          double conn_timeout,
 711                          double first_rw_timeout,
 712                          int ReadFirst)
 713 {
 714         int fdflags;
 715         int rc = -1;
 716
 717         become_session(IO->CitContext);
 718
 719         if (ReadFirst) {
 720                 IO->NextState = eReadMessage;
 721         }
 722         else {
 723                 IO->NextState = eSendReply;
 724         }
 725
 726         IO->SendBuf.fd = IO->RecvBuf.fd =
 727                 socket(
 728                         (IO->ConnectMe->IPv6)?PF_INET6:PF_INET,
 729                         SOCK_STREAM,
 730                         IPPROTO_TCP);
 731
 732         if (IO->SendBuf.fd < 0) {
 733                 EV_syslog(LOG_ERR,
 734                           "EVENT: socket() failed: %s\n",
 735                           strerror(errno));
 736
 737                 StrBufPrintf(IO->ErrMsg,
 738                              "Failed to create socket: %s",
 739                              strerror(errno));
 740                 return eAbort;
 741         }
 742         fdflags = fcntl(IO->SendBuf.fd, F_GETFL);
 743         if (fdflags < 0) {
 744                 EV_syslog(LOG_DEBUG,
 745                           "EVENT: unable to get socket flags! %s \n",
 746                           strerror(errno));
 747                 StrBufPrintf(IO->ErrMsg,
 748                              "Failed to get socket flags: %s",
 749                              strerror(errno));
 750                 return eAbort;
 751         }
 752         fdflags = fdflags | O_NONBLOCK;
 753         if (fcntl(IO->SendBuf.fd, F_SETFL, fdflags) < 0) {
 754                 EV_syslog(
 755                         LOG_DEBUG,
 756                         "EVENT: unable to set socket nonblocking flags! %s \n",
 757                         strerror(errno));
 758                 StrBufPrintf(IO->ErrMsg,
 759                              "Failed to set socket flags: %s",
 760                              strerror(errno));
 761                 close(IO->SendBuf.fd);
 762                 IO->SendBuf.fd = IO->RecvBuf.fd = -1;
 763                 return eAbort;
 764         }
 765 /* TODO: maye we could use offsetof() to calc the position of data...
 766  * http://doc.dvgu.ru/devel/ev.html#associating_custom_data_with_a_watcher
 767  */
 768         ev_io_init(&IO->recv_event, IO_recv_callback, IO->RecvBuf.fd, EV_READ);
 769         IO->recv_event.data = IO;
 770         ev_io_init(&IO->send_event, IO_send_callback, IO->SendBuf.fd, EV_WRITE);
 771         IO->send_event.data = IO;
 772
 773         ev_timer_init(&IO->conn_fail, IO_connfail_callback, conn_timeout, 0);
 774         IO->conn_fail.data = IO;
 775         ev_timer_init(&IO->rw_timeout, IO_Timeout_callback, first_rw_timeout,0);
 776         IO->rw_timeout.data = IO;
 777
 778
 779         /*  Bypass it like this: IO->Addr.sin_addr.s_addr = inet_addr("127.0.0.1"); */
 780 ///     ((struct sockaddr_in)IO->ConnectMe->Addr).sin_addr.s_addr = inet_addr("127.0.0.1");
 781         if (IO->ConnectMe->IPv6)
 782                 rc = connect(IO->SendBuf.fd,
 783                              &IO->ConnectMe->Addr,
 784                              sizeof(struct sockaddr_in6));
 785         else
 786                 rc = connect(IO->SendBuf.fd,
 787                              (struct sockaddr_in *)&IO->ConnectMe->Addr,
 788                              sizeof(struct sockaddr_in));
 789
 790         if (rc >= 0){
 791                 EVM_syslog(LOG_DEBUG, "connect() immediate success.\n");
 792                 set_start_callback(event_base, IO, 0);
 793                 ev_timer_start(event_base, &IO->rw_timeout);
 794                 return IO->NextState;
 795         }
 796         else if (errno == EINPROGRESS) {
 797                 EVM_syslog(LOG_DEBUG, "connect() have to wait now.\n");
 798
 799                 ev_io_init(&IO->conn_event,
 800                            IO_connestd_callback,
 801                            IO->SendBuf.fd,
 802                            EV_READ|EV_WRITE);
 803
 804                 IO->conn_event.data = IO;
 805
 806                 ev_io_start(event_base, &IO->conn_event);
 807                 ev_timer_start(event_base, &IO->conn_fail);
 808                 return IO->NextState;
 809         }
 810         else {
 811                 ev_idle_init(&IO->conn_fail_immediate,
 812                              IO_connfailimmediate_callback);
 813                 IO->conn_fail_immediate.data = IO;
 814                 ev_idle_start(event_base, &IO->conn_fail_immediate);
 815
 816                 EV_syslog(LOG_ERR, "connect() failed: %s\n", strerror(errno));
 817                 StrBufPrintf(IO->ErrMsg,
 818                              "Failed to connect: %s",
 819                              strerror(errno));
 820                 return IO->NextState;
 821         }
 822         return IO->NextState;
 823 }
 824
 825 void SetNextTimeout(AsyncIO *IO, double timeout)
 826 {
 827         IO->rw_timeout.repeat = timeout;
 828         ev_timer_again (event_base,  &IO->rw_timeout);
 829 }
 830
 831
 832 eNextState ReAttachIO(AsyncIO *IO,
 833                       void *pData,
 834                       int ReadFirst)
 835 {
 836         IO->Data = pData;
 837         become_session(IO->CitContext);
 838         ev_cleanup_start(event_base, &IO->abort_by_shutdown);
 839         if (ReadFirst) {
 840                 IO->NextState = eReadMessage;
 841         }
 842         else {
 843                 IO->NextState = eSendReply;
 844         }
 845         set_start_callback(event_base, IO, 0);
 846
 847         return IO->NextState;
 848 }
 849
 850 void InitIOStruct(AsyncIO *IO,
 851                   void *Data,
 852                   eNextState NextState,
 853                   IO_LineReaderCallback LineReader,
 854                   IO_CallBack DNS_Fail,
 855                   IO_CallBack SendDone,
 856                   IO_CallBack ReadDone,
 857                   IO_CallBack Terminate,
 858                   IO_CallBack ConnFail,
 859                   IO_CallBack Timeout,
 860                   IO_CallBack ShutdownAbort)
 861 {
 862         IO->Data          = Data;
 863
 864         IO->CitContext    = CloneContext(CC);
 865         ((CitContext *)IO->CitContext)->session_specific_data = (char*) Data;
 866
 867         IO->NextState     = NextState;
 868
 869         IO->SendDone      = SendDone;
 870         IO->ReadDone      = ReadDone;
 871         IO->Terminate     = Terminate;
 872         IO->LineReader    = LineReader;
 873         IO->ConnFail      = ConnFail;
 874         IO->Timeout       = Timeout;
 875         IO->ShutdownAbort = ShutdownAbort;
 876
 877         IO->DNS.Fail      = DNS_Fail;
 878
 879         IO->SendBuf.Buf   = NewStrBufPlain(NULL, 1024);
 880         IO->RecvBuf.Buf   = NewStrBufPlain(NULL, 1024);
 881         IO->IOBuf         = NewStrBuf();
 882
 883 }
 884
 885 extern int evcurl_init(AsyncIO *IO);
 886
 887 int InitcURLIOStruct(AsyncIO *IO,
 888                      void *Data,
 889                      const char* Desc,
 890                      IO_CallBack SendDone,
 891                      IO_CallBack Terminate,
 892                      IO_CallBack ShutdownAbort)
 893 {
 894         IO->Data          = Data;
 895
 896         IO->CitContext    = CloneContext(CC);
 897         ((CitContext *)IO->CitContext)->session_specific_data = (char*) Data;
 898
 899         IO->SendDone = SendDone;
 900         IO->Terminate = Terminate;
 901         IO->ShutdownAbort = ShutdownAbort;
 902
 903         strcpy(IO->HttpReq.errdesc, Desc);
 904
 905
 906         return  evcurl_init(IO);
 907
 908 }