citadel/event_client.c

   1 /*
   2  *
   3  * Copyright (c) 1998-2012 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,
  71                                        ev_cleanup *watcher,
  72                                        int revents)
  73 {
  74         AsyncIO *IO = watcher->data;
  75         EV_syslog(LOG_DEBUG, "EVENT Q: %s\n", __FUNCTION__);
  76
  77         assert(IO->ShutdownAbort);
  78         IO->ShutdownAbort(IO);
  79 }
  80
  81
  82 /*------------------------------------------------------------------------------
  83  *                              Server DB IO
  84  *----------------------------------------------------------------------------*/
  85 extern int evdb_count;
  86 extern pthread_mutex_t DBEventQueueMutex;
  87 extern HashList *DBInboundEventQueue;
  88 extern struct ev_loop *event_db;
  89 extern ev_async DBAddJob;
  90 extern ev_async DBExitEventLoop;
  91
  92 eNextState QueueDBOperation(AsyncIO *IO, IO_CallBack CB)
  93 {
  94         IOAddHandler *h;
  95         int i;
  96
  97         h = (IOAddHandler*)malloc(sizeof(IOAddHandler));
  98         h->IO = IO;
  99         h->EvAttch = CB;
 100         ev_cleanup_init(&IO->db_abort_by_shutdown,
 101                         IO_abort_shutdown_callback);
 102         IO->db_abort_by_shutdown.data = IO;
 103         ev_cleanup_start(event_db, &IO->db_abort_by_shutdown);
 104
 105         pthread_mutex_lock(&DBEventQueueMutex);
 106         EVM_syslog(LOG_DEBUG, "DBEVENT Q\n");
 107         i = ++evdb_count ;
 108         Put(DBInboundEventQueue, IKEY(i), h, NULL);
 109         pthread_mutex_unlock(&DBEventQueueMutex);
 110
 111         ev_async_send (event_db, &DBAddJob);
 112         EVM_syslog(LOG_DEBUG, "DBEVENT Q Done.\n");
 113         return eDBQuery;
 114 }
 115
 116 void ShutDownDBCLient(AsyncIO *IO)
 117 {
 118         CitContext *Ctx =IO->CitContext;
 119         become_session(Ctx);
 120
 121         EVM_syslog(LOG_DEBUG, "DBEVENT Terminating.\n");
 122         ev_cleanup_stop(event_db, &IO->db_abort_by_shutdown);
 123
 124         assert(IO->Terminate);
 125         IO->Terminate(IO);
 126 }
 127
 128 void
 129 DB_PerformNext(struct ev_loop *loop, ev_idle *watcher, int revents)
 130 {
 131         AsyncIO *IO = watcher->data;
 132         EV_syslog(LOG_DEBUG, "event: %s\n", __FUNCTION__);
 133         become_session(IO->CitContext);
 134
 135         ev_idle_stop(event_db, &IO->db_unwind_stack);
 136
 137         assert(IO->NextDBOperation);
 138         switch (IO->NextDBOperation(IO))
 139         {
 140         case eDBQuery:
 141                 break;
 142         case eSendDNSQuery:
 143         case eReadDNSReply:
 144         case eConnect:
 145         case eSendReply:
 146         case eSendMore:
 147         case eSendFile:
 148         case eReadMessage:
 149         case eReadMore:
 150         case eReadPayload:
 151         case eReadFile:
 152                 ev_cleanup_stop(loop, &IO->db_abort_by_shutdown);
 153                 break;
 154         case eTerminateConnection:
 155         case eAbort:
 156                 ev_idle_stop(event_db, &IO->db_unwind_stack);
 157                 ev_cleanup_stop(loop, &IO->db_abort_by_shutdown);
 158                 ShutDownDBCLient(IO);
 159         }
 160 }
 161
 162 eNextState NextDBOperation(AsyncIO *IO, IO_CallBack CB)
 163 {
 164         IO->NextDBOperation = CB;
 165         ev_idle_init(&IO->db_unwind_stack,
 166                      DB_PerformNext);
 167         IO->db_unwind_stack.data = IO;
 168         ev_idle_start(event_db, &IO->db_unwind_stack);
 169         return eDBQuery;
 170 }
 171
 172 /*------------------------------------------------------------------------------
 173  *                      Client IO
 174  *----------------------------------------------------------------------------*/
 175 extern int evbase_count;
 176 extern pthread_mutex_t EventQueueMutex;
 177 extern HashList *InboundEventQueue;
 178 extern struct ev_loop *event_base;
 179 extern ev_async AddJob;
 180 extern ev_async ExitEventLoop;
 181
 182
 183 eNextState QueueEventContext(AsyncIO *IO, IO_CallBack CB)
 184 {
 185         IOAddHandler *h;
 186         int i;
 187
 188         h = (IOAddHandler*)malloc(sizeof(IOAddHandler));
 189         h->IO = IO;
 190         h->EvAttch = CB;
 191         ev_cleanup_init(&IO->abort_by_shutdown,
 192                         IO_abort_shutdown_callback);
 193         IO->abort_by_shutdown.data = IO;
 194         ev_cleanup_start(event_base, &IO->abort_by_shutdown);
 195
 196         pthread_mutex_lock(&EventQueueMutex);
 197         EVM_syslog(LOG_DEBUG, "EVENT Q\n");
 198         i = ++evbase_count;
 199         Put(InboundEventQueue, IKEY(i), h, NULL);
 200         pthread_mutex_unlock(&EventQueueMutex);
 201
 202         ev_async_send (event_base, &AddJob);
 203         EVM_syslog(LOG_DEBUG, "EVENT Q Done.\n");
 204         return eSendReply;
 205 }
 206
 207 extern eNextState evcurl_handle_start(AsyncIO *IO);
 208
 209 eNextState QueueCurlContext(AsyncIO *IO)
 210 {
 211         IOAddHandler *h;
 212         int i;
 213
 214         h = (IOAddHandler*)malloc(sizeof(IOAddHandler));
 215         h->IO = IO;
 216         h->EvAttch = evcurl_handle_start;
 217
 218         pthread_mutex_lock(&EventQueueMutex);
 219         EVM_syslog(LOG_DEBUG, "EVENT Q\n");
 220         i = ++evbase_count;
 221         Put(InboundEventQueue, IKEY(i), h, NULL);
 222         pthread_mutex_unlock(&EventQueueMutex);
 223
 224         ev_async_send (event_base, &AddJob);
 225         EVM_syslog(LOG_DEBUG, "EVENT Q Done.\n");
 226         return eSendReply;
 227 }
 228
 229 void DestructCAres(AsyncIO *IO);
 230 void FreeAsyncIOContents(AsyncIO *IO)
 231 {
 232         CitContext *Ctx = IO->CitContext;
 233
 234         FreeStrBuf(&IO->IOBuf);
 235         FreeStrBuf(&IO->SendBuf.Buf);
 236         FreeStrBuf(&IO->RecvBuf.Buf);
 237
 238         DestructCAres(IO);
 239
 240         FreeURL(&IO->ConnectMe);
 241         FreeStrBuf(&IO->HttpReq.ReplyData);
 242
 243         Ctx->state = CON_IDLE;
 244         Ctx->kill_me = 1;
 245 }
 246
 247
 248 void StopClientWatchers(AsyncIO *IO)
 249 {
 250         ev_timer_stop (event_base, &IO->rw_timeout);
 251         ev_timer_stop(event_base, &IO->conn_fail);
 252         ev_idle_stop(event_base, &IO->unwind_stack);
 253
 254         ev_io_stop(event_base, &IO->conn_event);
 255         ev_io_stop(event_base, &IO->send_event);
 256         ev_io_stop(event_base, &IO->recv_event);
 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         EVM_syslog(LOG_DEBUG, "EVENT Terminating \n");
 268
 269         ev_cleanup_stop(event_base, &IO->abort_by_shutdown);
 270         StopClientWatchers(IO);
 271
 272         if (IO->DNS.Channel != NULL) {
 273                 ares_destroy(IO->DNS.Channel);
 274                 ev_io_stop(event_base, &IO->DNS.recv_event);
 275                 ev_io_stop(event_base, &IO->DNS.send_event);
 276                 IO->DNS.Channel = NULL;
 277         }
 278         assert(IO->Terminate);
 279         IO->Terminate(IO);
 280 }
 281
 282
 283 eReadState HandleInbound(AsyncIO *IO)
 284 {
 285         const char *Err = NULL;
 286         eReadState Finished = eBufferNotEmpty;
 287
 288         become_session(IO->CitContext);
 289
 290         while ((Finished == eBufferNotEmpty) &&
 291                ((IO->NextState == eReadMessage)||
 292                 (IO->NextState == eReadMore)||
 293                 (IO->NextState == eReadFile)||
 294                 (IO->NextState == eReadPayload)))
 295         {
 296                 /* Reading lines...
 297                  * lex line reply in callback,
 298                  * or do it ourselves.
 299                  * i.e. as nnn-blabla means continue reading in SMTP
 300                  */
 301                 if ((IO->NextState == eReadFile) &&
 302                     (Finished == eBufferNotEmpty))
 303                 {
 304                         Finished = WriteIOBAlreadyRead(&IO->IOB, &Err);
 305                         if (Finished == eReadSuccess)
 306                         {
 307                                 IO->NextState = eSendReply;
 308                         }
 309                 }
 310                 else if (IO->LineReader)
 311                         Finished = IO->LineReader(IO);
 312                 else
 313                         Finished = StrBufChunkSipLine(IO->IOBuf,
 314                                                       &IO->RecvBuf);
 315
 316                 switch (Finished) {
 317                 case eMustReadMore: /// read new from socket...
 318                         break;
 319                 case eBufferNotEmpty: /* shouldn't happen... */
 320                 case eReadSuccess: /// done for now...
 321                         break;
 322                 case eReadFail: /// WHUT?
 323                                 ///todo: shut down!
 324                         break;
 325                 }
 326
 327                 if (Finished != eMustReadMore) {
 328                         assert(IO->ReadDone);
 329                         ev_io_stop(event_base, &IO->recv_event);
 330                         IO->NextState = IO->ReadDone(IO);
 331                         Finished = StrBufCheckBuffer(&IO->RecvBuf);
 332                 }
 333         }
 334
 335         switch (IO->NextState) {
 336         case eSendFile:
 337                 ev_io_start(event_base, &IO->send_event);
 338                 break;
 339         case eSendReply:
 340         case eSendMore:
 341                 assert(IO->SendDone);
 342                 IO->NextState = IO->SendDone(IO);
 343                 ev_io_start(event_base, &IO->send_event);
 344                 break;
 345         case eReadPayload:
 346         case eReadMore:
 347         case eReadFile:
 348                 ev_io_start(event_base, &IO->recv_event);
 349                 break;
 350         case eTerminateConnection:
 351 //////TODOxxxx
 352                 break;
 353         case eAbort:
 354                 ShutDownCLient(IO);
 355                 break;
 356         case eSendDNSQuery:
 357         case eReadDNSReply:
 358         case eDBQuery:
 359         case eConnect:
 360         case eReadMessage:
 361                 break;
 362         }
 363         return Finished;
 364 }
 365
 366
 367 static void
 368 IO_send_callback(struct ev_loop *loop, ev_io *watcher, int revents)
 369 {
 370         int rc;
 371         AsyncIO *IO = watcher->data;
 372         const char *errmsg = NULL;
 373
 374         become_session(IO->CitContext);
 375 #ifdef BIGBAD_IODBG
 376         {
 377                 int rv = 0;
 378                 char fn [SIZ];
 379                 FILE *fd;
 380                 const char *pch = ChrPtr(IO->SendBuf.Buf);
 381                 const char *pchh = IO->SendBuf.ReadWritePointer;
 382                 long nbytes;
 383
 384                 if (pchh == NULL)
 385                         pchh = pch;
 386
 387                 nbytes = StrLength(IO->SendBuf.Buf) - (pchh - pch);
 388                 snprintf(fn, SIZ, "/tmp/foolog_ev_%s.%d",
 389                          ((CitContext*)(IO->CitContext))->ServiceName,
 390                          IO->SendBuf.fd);
 391
 392                 fd = fopen(fn, "a+");
 393                 fprintf(fd, "Send: BufSize: %ld BufContent: [",
 394                         nbytes);
 395                 rv = fwrite(pchh, nbytes, 1, fd);
 396                 if (!rv) printf("failed to write debug to %s!\n", fn);
 397                 fprintf(fd, "]\n");
 398 #endif
 399                 switch (IO->NextState) {
 400                 case eSendFile:
 401                         rc = FileSendChunked(&IO->IOB, &errmsg);
 402                         if (rc < 0)
 403                                 StrBufPlain(IO->ErrMsg, errmsg, -1);
 404                         break;
 405                 default:
 406                         rc = StrBuf_write_one_chunk_callback(watcher->fd,
 407                                                              0/*TODO*/,
 408                                                              &IO->SendBuf);
 409                 }
 410
 411 #ifdef BIGBAD_IODBG
 412                 fprintf(fd, "Sent: BufSize: %d bytes.\n", rc);
 413                 fclose(fd);
 414         }
 415 #endif
 416         if (rc == 0)
 417         {
 418                 ev_io_stop(event_base, &IO->send_event);
 419                 switch (IO->NextState) {
 420                 case eSendMore:
 421                         assert(IO->SendDone);
 422                         IO->NextState = IO->SendDone(IO);
 423
 424                         if ((IO->NextState == eTerminateConnection) ||
 425                             (IO->NextState == eAbort) )
 426                                 ShutDownCLient(IO);
 427                         else {
 428                                 ev_io_start(event_base, &IO->send_event);
 429                         }
 430                         break;
 431                 case eSendFile:
 432                         if (IO->IOB.ChunkSendRemain > 0) {
 433                                 ev_io_start(event_base, &IO->recv_event);
 434                         } else {
 435                                 assert(IO->ReadDone);
 436                                 IO->NextState = IO->ReadDone(IO);
 437                                 switch(IO->NextState) {
 438                                 case eSendDNSQuery:
 439                                 case eReadDNSReply:
 440                                 case eDBQuery:
 441                                 case eConnect:
 442                                         break;
 443                                 case eSendReply:
 444                                 case eSendMore:
 445                                 case eSendFile:
 446                                         ev_io_start(event_base,
 447                                                     &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                         {
 470                                 HandleInbound(IO);
 471                         }
 472                         else {
 473                                 ev_io_start(event_base, &IO->recv_event);
 474                         }
 475
 476                         break;
 477                 case eDBQuery:
 478                         /*
 479                          * we now live in another queue,
 480                          * so we have to unregister.
 481                          */
 482                         ev_cleanup_stop(loop, &IO->abort_by_shutdown);
 483                         break;
 484                 case eSendDNSQuery:
 485                 case eReadDNSReply:
 486                 case eConnect:
 487                 case eTerminateConnection:
 488                 case eAbort:
 489                         break;
 490                 }
 491         }
 492         else if (rc < 0) {
 493                 assert(IO->Timeout);
 494                 IO->Timeout(IO);
 495         }
 496         /* else : must write more. */
 497 }
 498 static void
 499 set_start_callback(struct ev_loop *loop, AsyncIO *IO, int revents)
 500 {
 501         switch(IO->NextState) {
 502         case eReadMore:
 503         case eReadMessage:
 504         case eReadFile:
 505                 ev_io_start(event_base, &IO->recv_event);
 506                 break;
 507         case eSendReply:
 508         case eSendMore:
 509         case eReadPayload:
 510         case eSendFile:
 511                 become_session(IO->CitContext);
 512                 IO_send_callback(loop, &IO->send_event, revents);
 513                 break;
 514         case eDBQuery:
 515         case eSendDNSQuery:
 516         case eReadDNSReply:
 517         case eConnect:
 518         case eTerminateConnection:
 519         case eAbort:
 520                 /// TODO: WHUT?
 521                 break;
 522         }
 523 }
 524
 525 static void
 526 IO_Timeout_callback(struct ev_loop *loop, ev_timer *watcher, int revents)
 527 {
 528         AsyncIO *IO = watcher->data;
 529
 530         ev_timer_stop (event_base, &IO->rw_timeout);
 531         become_session(IO->CitContext);
 532
 533         if (IO->SendBuf.fd != 0)
 534         {
 535                 ev_io_stop(event_base, &IO->send_event);
 536                 ev_io_stop(event_base, &IO->recv_event);
 537                 ev_timer_stop (event_base, &IO->rw_timeout);
 538                 close(IO->SendBuf.fd);
 539                 IO->SendBuf.fd = IO->RecvBuf.fd = 0;
 540         }
 541
 542         assert(IO->Timeout);
 543         switch (IO->Timeout(IO))
 544         {
 545         case eAbort:
 546                 ShutDownCLient(IO);
 547         default:
 548                 break;
 549         }
 550 }
 551
 552 static void
 553 IO_connfail_callback(struct ev_loop *loop, ev_timer *watcher, int revents)
 554 {
 555         AsyncIO *IO = watcher->data;
 556
 557         ev_timer_stop (event_base, &IO->conn_fail);
 558
 559         if (IO->SendBuf.fd != 0)
 560         {
 561                 ev_io_stop(loop, &IO->conn_event);
 562                 ev_io_stop(event_base, &IO->send_event);
 563                 ev_io_stop(event_base, &IO->recv_event);
 564                 ev_timer_stop (event_base, &IO->rw_timeout);
 565                 close(IO->SendBuf.fd);
 566                 IO->SendBuf.fd = IO->RecvBuf.fd = 0;
 567         }
 568         become_session(IO->CitContext);
 569
 570         assert(IO->ConnFail);
 571         switch (IO->ConnFail(IO))
 572         {
 573         case eAbort:
 574                 ShutDownCLient(IO);
 575         default:
 576                 break;
 577
 578         }
 579 }
 580
 581 static void
 582 IO_connfailimmediate_callback(struct ev_loop *loop,
 583                               ev_idle *watcher,
 584                               int revents)
 585 {
 586         AsyncIO *IO = watcher->data;
 587
 588         ev_idle_stop (event_base, &IO->conn_fail_immediate);
 589
 590         if (IO->SendBuf.fd != 0)
 591         {
 592                 close(IO->SendBuf.fd);
 593                 IO->SendBuf.fd = IO->RecvBuf.fd = 0;
 594         }
 595         become_session(IO->CitContext);
 596
 597         assert(IO->ConnFail);
 598         switch (IO->ConnFail(IO))
 599         {
 600         case eAbort:
 601                 ShutDownCLient(IO);
 602         default:
 603                 break;
 604
 605         }
 606 }
 607
 608 static void
 609 IO_connestd_callback(struct ev_loop *loop, ev_io *watcher, int revents)
 610 {
 611         AsyncIO *IO = watcher->data;
 612
 613         ev_io_stop(loop, &IO->conn_event);
 614         ev_timer_stop (event_base, &IO->conn_fail);
 615         set_start_callback(loop, IO, revents);
 616 }
 617 static void
 618 IO_recv_callback(struct ev_loop *loop, ev_io *watcher, int revents)
 619 {
 620         const char *errmsg;
 621         ssize_t nbytes;
 622         AsyncIO *IO = watcher->data;
 623
 624         switch (IO->NextState) {
 625         case eReadFile:
 626                 nbytes = FileRecvChunked(&IO->IOB, &errmsg);
 627                 if (nbytes < 0)
 628                         StrBufPlain(IO->ErrMsg, errmsg, -1);
 629                 else
 630                 {
 631                         if (IO->IOB.ChunkSendRemain == 0)
 632                         {
 633                                 IO->NextState = eSendReply;
 634                         }
 635                         else
 636                                 return;
 637                 }
 638                 break;
 639         default:
 640                 nbytes = StrBuf_read_one_chunk_callback(watcher->fd,
 641                                                         0 /*TODO */,
 642                                                         &IO->RecvBuf);
 643                 break;
 644         }
 645
 646 #ifdef BIGBAD_IODBG
 647         {
 648                 long nbytes;
 649                 int rv = 0;
 650                 char fn [SIZ];
 651                 FILE *fd;
 652                 const char *pch = ChrPtr(IO->RecvBuf.Buf);
 653                 const char *pchh = IO->RecvBuf.ReadWritePointer;
 654
 655                 if (pchh == NULL)
 656                         pchh = pch;
 657
 658                 nbytes = StrLength(IO->RecvBuf.Buf) - (pchh - pch);
 659                 snprintf(fn, SIZ, "/tmp/foolog_ev_%s.%d",
 660                          ((CitContext*)(IO->CitContext))->ServiceName,
 661                          IO->SendBuf.fd);
 662
 663                 fd = fopen(fn, "a+");
 664                 fprintf(fd, "Read: BufSize: %ld BufContent: [",
 665                         nbytes);
 666                 rv = fwrite(pchh, nbytes, 1, fd);
 667                 if (!rv) printf("failed to write debug to %s!\n", fn);
 668                 fprintf(fd, "]\n");
 669                 fclose(fd);
 670         }
 671 #endif
 672         if (nbytes > 0) {
 673                 HandleInbound(IO);
 674         } else if (nbytes == 0) {
 675                 assert(IO->Timeout);
 676
 677                 switch (IO->Timeout(IO))
 678                 {
 679                 case eAbort:
 680                         ShutDownCLient(IO);
 681                 default:
 682                         break;
 683                 }
 684                 return;
 685         } else if (nbytes == -1) {
 686 /// TODO: FD is gone. kick it.        sock_buff_invoke_free(sb, errno);
 687                 EV_syslog(LOG_DEBUG,
 688                           "EVENT: Socket Invalid! %s \n",
 689                           strerror(errno));
 690                 ShutDownCLient(IO);
 691                 return;
 692         }
 693 }
 694
 695 void
 696 IO_postdns_callback(struct ev_loop *loop, ev_idle *watcher, int revents)
 697 {
 698         AsyncIO *IO = watcher->data;
 699         EV_syslog(LOG_DEBUG, "event: %s\n", __FUNCTION__);
 700         become_session(IO->CitContext);
 701         assert(IO->DNS.Fail);
 702         assert(IO->DNS.Query->PostDNS);
 703         switch (IO->DNS.Query->PostDNS(IO))
 704         {
 705         case eAbort:
 706                 switch (IO->DNS.Fail(IO)) {
 707                 case eAbort:
 708                         ShutDownCLient(IO);
 709                 default:
 710                         break;
 711                 }
 712         default:
 713                 break;
 714         }
 715 }
 716
 717
 718 eNextState EvConnectSock(AsyncIO *IO,
 719                          double conn_timeout,
 720                          double first_rw_timeout,
 721                          int ReadFirst)
 722 {
 723         int fdflags;
 724         int rc = -1;
 725
 726         become_session(IO->CitContext);
 727
 728         if (ReadFirst) {
 729                 IO->NextState = eReadMessage;
 730         }
 731         else {
 732                 IO->NextState = eSendReply;
 733         }
 734
 735         IO->SendBuf.fd = IO->RecvBuf.fd =
 736                 socket(
 737                         (IO->ConnectMe->IPv6)?PF_INET6:PF_INET,
 738                         SOCK_STREAM,
 739                         IPPROTO_TCP);
 740
 741         if (IO->SendBuf.fd < 0) {
 742                 EV_syslog(LOG_ERR,
 743                           "EVENT: socket() failed: %s\n",
 744                           strerror(errno));
 745
 746                 StrBufPrintf(IO->ErrMsg,
 747                              "Failed to create socket: %s",
 748                              strerror(errno));
 749                 return eAbort;
 750         }
 751         fdflags = fcntl(IO->SendBuf.fd, F_GETFL);
 752         if (fdflags < 0) {
 753                 EV_syslog(LOG_DEBUG,
 754                           "EVENT: unable to get socket flags! %s \n",
 755                           strerror(errno));
 756                 StrBufPrintf(IO->ErrMsg,
 757                              "Failed to get socket flags: %s",
 758                              strerror(errno));
 759                 return eAbort;
 760         }
 761         fdflags = fdflags | O_NONBLOCK;
 762         if (fcntl(IO->SendBuf.fd, F_SETFL, fdflags) < 0) {
 763                 EV_syslog(
 764                         LOG_DEBUG,
 765                         "EVENT: unable to set socket nonblocking flags! %s \n",
 766                         strerror(errno));
 767                 StrBufPrintf(IO->ErrMsg,
 768                              "Failed to set socket flags: %s",
 769                              strerror(errno));
 770                 close(IO->SendBuf.fd);
 771                 IO->SendBuf.fd = IO->RecvBuf.fd = -1;
 772                 return eAbort;
 773         }
 774 /* TODO: maye we could use offsetof() to calc the position of data...
 775  * http://doc.dvgu.ru/devel/ev.html#associating_custom_data_with_a_watcher
 776  */
 777         ev_io_init(&IO->recv_event, IO_recv_callback, IO->RecvBuf.fd, EV_READ);
 778         IO->recv_event.data = IO;
 779         ev_io_init(&IO->send_event, IO_send_callback, IO->SendBuf.fd, EV_WRITE);
 780         IO->send_event.data = IO;
 781
 782         ev_timer_init(&IO->conn_fail, IO_connfail_callback, conn_timeout, 0);
 783         IO->conn_fail.data = IO;
 784         ev_timer_init(&IO->rw_timeout, IO_Timeout_callback, first_rw_timeout,0);
 785         IO->rw_timeout.data = IO;
 786
 787
 788         /* for debugging you may bypass it like this:
 789          * IO->Addr.sin_addr.s_addr = inet_addr("127.0.0.1");
 790          * ((struct sockaddr_in)IO->ConnectMe->Addr).sin_addr.s_addr =
 791          *   inet_addr("127.0.0.1");
 792          */
 793         if (IO->ConnectMe->IPv6)
 794                 rc = connect(IO->SendBuf.fd,
 795                              &IO->ConnectMe->Addr,
 796                              sizeof(struct sockaddr_in6));
 797         else
 798                 rc = connect(IO->SendBuf.fd,
 799                              (struct sockaddr_in *)&IO->ConnectMe->Addr,
 800                              sizeof(struct sockaddr_in));
 801
 802         if (rc >= 0){
 803                 EVM_syslog(LOG_DEBUG, "connect() immediate success.\n");
 804                 set_start_callback(event_base, IO, 0);
 805                 ev_timer_start(event_base, &IO->rw_timeout);
 806                 return IO->NextState;
 807         }
 808         else if (errno == EINPROGRESS) {
 809                 EVM_syslog(LOG_DEBUG, "connect() have to wait now.\n");
 810
 811                 ev_io_init(&IO->conn_event,
 812                            IO_connestd_callback,
 813                            IO->SendBuf.fd,
 814                            EV_READ|EV_WRITE);
 815
 816                 IO->conn_event.data = IO;
 817
 818                 ev_io_start(event_base, &IO->conn_event);
 819                 ev_timer_start(event_base, &IO->conn_fail);
 820                 return IO->NextState;
 821         }
 822         else {
 823                 ev_idle_init(&IO->conn_fail_immediate,
 824                              IO_connfailimmediate_callback);
 825                 IO->conn_fail_immediate.data = IO;
 826                 ev_idle_start(event_base, &IO->conn_fail_immediate);
 827
 828                 EV_syslog(LOG_ERR, "connect() failed: %s\n", strerror(errno));
 829                 StrBufPrintf(IO->ErrMsg,
 830                              "Failed to connect: %s",
 831                              strerror(errno));
 832                 return IO->NextState;
 833         }
 834         return IO->NextState;
 835 }
 836
 837 void SetNextTimeout(AsyncIO *IO, double timeout)
 838 {
 839         IO->rw_timeout.repeat = timeout;
 840         ev_timer_again (event_base,  &IO->rw_timeout);
 841 }
 842
 843
 844 eNextState ReAttachIO(AsyncIO *IO,
 845                       void *pData,
 846                       int ReadFirst)
 847 {
 848         IO->Data = pData;
 849         become_session(IO->CitContext);
 850         ev_cleanup_start(event_base, &IO->abort_by_shutdown);
 851         if (ReadFirst) {
 852                 IO->NextState = eReadMessage;
 853         }
 854         else {
 855                 IO->NextState = eSendReply;
 856         }
 857         set_start_callback(event_base, IO, 0);
 858
 859         return IO->NextState;
 860 }
 861
 862 void InitIOStruct(AsyncIO *IO,
 863                   void *Data,
 864                   eNextState NextState,
 865                   IO_LineReaderCallback LineReader,
 866                   IO_CallBack DNS_Fail,
 867                   IO_CallBack SendDone,
 868                   IO_CallBack ReadDone,
 869                   IO_CallBack Terminate,
 870                   IO_CallBack ConnFail,
 871                   IO_CallBack Timeout,
 872                   IO_CallBack ShutdownAbort)
 873 {
 874         IO->Data          = Data;
 875
 876         IO->CitContext    = CloneContext(CC);
 877         ((CitContext *)IO->CitContext)->session_specific_data = (char*) Data;
 878
 879         IO->NextState     = NextState;
 880
 881         IO->SendDone      = SendDone;
 882         IO->ReadDone      = ReadDone;
 883         IO->Terminate     = Terminate;
 884         IO->LineReader    = LineReader;
 885         IO->ConnFail      = ConnFail;
 886         IO->Timeout       = Timeout;
 887         IO->ShutdownAbort = ShutdownAbort;
 888
 889         IO->DNS.Fail      = DNS_Fail;
 890
 891         IO->SendBuf.Buf   = NewStrBufPlain(NULL, 1024);
 892         IO->RecvBuf.Buf   = NewStrBufPlain(NULL, 1024);
 893         IO->IOBuf         = NewStrBuf();
 894
 895 }
 896
 897 extern int evcurl_init(AsyncIO *IO);
 898
 899 int InitcURLIOStruct(AsyncIO *IO,
 900                      void *Data,
 901                      const char* Desc,
 902                      IO_CallBack SendDone,
 903                      IO_CallBack Terminate,
 904                      IO_CallBack ShutdownAbort)
 905 {
 906         IO->Data          = Data;
 907
 908         IO->CitContext    = CloneContext(CC);
 909         ((CitContext *)IO->CitContext)->session_specific_data = (char*) Data;
 910
 911         IO->SendDone = SendDone;
 912         IO->Terminate = Terminate;
 913         IO->ShutdownAbort = ShutdownAbort;
 914
 915         strcpy(IO->HttpReq.errdesc, Desc);
 916
 917
 918         return  evcurl_init(IO);
 919
 920 }