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         if (Ctx) {
 244                 Ctx->state = CON_IDLE;
 245                 Ctx->kill_me = 1;
 246         }
 247 }
 248
 249
 250 void StopClientWatchers(AsyncIO *IO)
 251 {
 252         ev_timer_stop (event_base, &IO->rw_timeout);
 253         ev_timer_stop(event_base, &IO->conn_fail);
 254         ev_idle_stop(event_base, &IO->unwind_stack);
 255
 256         ev_io_stop(event_base, &IO->conn_event);
 257         ev_io_stop(event_base, &IO->send_event);
 258         ev_io_stop(event_base, &IO->recv_event);
 259         close(IO->SendBuf.fd);
 260         IO->SendBuf.fd = 0;
 261         IO->RecvBuf.fd = 0;
 262 }
 263
 264 void ShutDownCLient(AsyncIO *IO)
 265 {
 266         CitContext *Ctx =IO->CitContext;
 267         become_session(Ctx);
 268
 269         EVM_syslog(LOG_DEBUG, "EVENT Terminating \n");
 270
 271         ev_cleanup_stop(event_base, &IO->abort_by_shutdown);
 272         StopClientWatchers(IO);
 273
 274         if (IO->DNS.Channel != NULL) {
 275                 ares_destroy(IO->DNS.Channel);
 276                 ev_io_stop(event_base, &IO->DNS.recv_event);
 277                 ev_io_stop(event_base, &IO->DNS.send_event);
 278                 IO->DNS.Channel = NULL;
 279         }
 280         assert(IO->Terminate);
 281         IO->Terminate(IO);
 282 }
 283
 284 eReadState HandleInbound(AsyncIO *IO)
 285 {
 286         const char *Err = NULL;
 287         eReadState Finished = eBufferNotEmpty;
 288
 289         become_session(IO->CitContext);
 290
 291         while ((Finished == eBufferNotEmpty) &&
 292                ((IO->NextState == eReadMessage)||
 293                 (IO->NextState == eReadMore)||
 294                 (IO->NextState == eReadFile)||
 295                 (IO->NextState == eReadPayload)))
 296         {
 297                 /* Reading lines...
 298                  * lex line reply in callback,
 299                  * or do it ourselves.
 300                  * i.e. as nnn-blabla means continue reading in SMTP
 301                  */
 302                 if ((IO->NextState == eReadFile) &&
 303                     (Finished == eBufferNotEmpty))
 304                 {
 305                         Finished = WriteIOBAlreadyRead(&IO->IOB, &Err);
 306                         if (Finished == eReadSuccess)
 307                         {
 308                                 IO->NextState = eSendReply;
 309                         }
 310                 }
 311                 else if (IO->LineReader)
 312                         Finished = IO->LineReader(IO);
 313                 else
 314                         Finished = StrBufChunkSipLine(IO->IOBuf,
 315                                                       &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                 if (Finished != eMustReadMore) {
 329                         assert(IO->ReadDone);
 330                         ev_io_stop(event_base, &IO->recv_event);
 331                         IO->NextState = IO->ReadDone(IO);
 332                         Finished = StrBufCheckBuffer(&IO->RecvBuf);
 333                 }
 334         }
 335
 336         switch (IO->NextState) {
 337         case eSendFile:
 338                 ev_io_start(event_base, &IO->send_event);
 339                 break;
 340         case eSendReply:
 341         case eSendMore:
 342                 assert(IO->SendDone);
 343                 IO->NextState = IO->SendDone(IO);
 344                 ev_io_start(event_base, &IO->send_event);
 345                 break;
 346         case eReadPayload:
 347         case eReadMore:
 348         case eReadFile:
 349                 ev_io_start(event_base, &IO->recv_event);
 350                 break;
 351         case eTerminateConnection:
 352 //////TODOxxxx
 353                 break;
 354         case eAbort:
 355                 ShutDownCLient(IO);
 356                 break;
 357         case eSendDNSQuery:
 358         case eReadDNSReply:
 359         case eDBQuery:
 360         case eConnect:
 361         case eReadMessage:
 362                 break;
 363         }
 364         return Finished;
 365 }
 366
 367
 368 static void
 369 IO_send_callback(struct ev_loop *loop, ev_io *watcher, int revents)
 370 {
 371         int rc;
 372         AsyncIO *IO = watcher->data;
 373         const char *errmsg = NULL;
 374
 375         become_session(IO->CitContext);
 376 #ifdef BIGBAD_IODBG
 377         {
 378                 int rv = 0;
 379                 char fn [SIZ];
 380                 FILE *fd;
 381                 const char *pch = ChrPtr(IO->SendBuf.Buf);
 382                 const char *pchh = IO->SendBuf.ReadWritePointer;
 383                 long nbytes;
 384
 385                 if (pchh == NULL)
 386                         pchh = pch;
 387
 388                 nbytes = StrLength(IO->SendBuf.Buf) - (pchh - pch);
 389                 snprintf(fn, SIZ, "/tmp/foolog_ev_%s.%d",
 390                          ((CitContext*)(IO->CitContext))->ServiceName,
 391                          IO->SendBuf.fd);
 392
 393                 fd = fopen(fn, "a+");
 394                 fprintf(fd, "Send: BufSize: %ld BufContent: [",
 395                         nbytes);
 396                 rv = fwrite(pchh, nbytes, 1, fd);
 397                 if (!rv) printf("failed to write debug to %s!\n", fn);
 398                 fprintf(fd, "]\n");
 399 #endif
 400                 switch (IO->NextState) {
 401                 case eSendFile:
 402                         rc = FileSendChunked(&IO->IOB, &errmsg);
 403                         if (rc < 0)
 404                                 StrBufPlain(IO->ErrMsg, errmsg, -1);
 405                         break;
 406                 default:
 407                         rc = StrBuf_write_one_chunk_callback(watcher->fd,
 408                                                              0/*TODO*/,
 409                                                              &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,
 448                                                     &IO->send_event);
 449                                         break;
 450                                 case eReadMessage:
 451                                 case eReadMore:
 452                                 case eReadPayload:
 453                                 case eReadFile:
 454                                         break;
 455                                 case eTerminateConnection:
 456                                 case eAbort:
 457                                         break;
 458                                 }
 459                         }
 460                         break;
 461                 case eSendReply:
 462                     if (StrBufCheckBuffer(&IO->SendBuf) != eReadSuccess)
 463                         break;
 464                     IO->NextState = eReadMore;
 465                 case eReadMore:
 466                 case eReadMessage:
 467                 case eReadPayload:
 468                 case eReadFile:
 469                         if (StrBufCheckBuffer(&IO->RecvBuf) == eBufferNotEmpty)
 470                         {
 471                                 HandleInbound(IO);
 472                         }
 473                         else {
 474                                 ev_io_start(event_base, &IO->recv_event);
 475                         }
 476
 477                         break;
 478                 case eDBQuery:
 479                         /*
 480                          * we now live in another queue,
 481                          * so we have to unregister.
 482                          */
 483                         ev_cleanup_stop(loop, &IO->abort_by_shutdown);
 484                         break;
 485                 case eSendDNSQuery:
 486                 case eReadDNSReply:
 487                 case eConnect:
 488                 case eTerminateConnection:
 489                 case eAbort:
 490                         break;
 491                 }
 492         }
 493         else if (rc < 0) {
 494                 assert(IO->Timeout);
 495                 IO->Timeout(IO);
 496         }
 497         /* else : must write more. */
 498 }
 499 static void
 500 set_start_callback(struct ev_loop *loop, AsyncIO *IO, int revents)
 501 {
 502         switch(IO->NextState) {
 503         case eReadMore:
 504         case eReadMessage:
 505         case eReadFile:
 506                 ev_io_start(event_base, &IO->recv_event);
 507                 break;
 508         case eSendReply:
 509         case eSendMore:
 510         case eReadPayload:
 511         case eSendFile:
 512                 become_session(IO->CitContext);
 513                 IO_send_callback(loop, &IO->send_event, revents);
 514                 break;
 515         case eDBQuery:
 516         case eSendDNSQuery:
 517         case eReadDNSReply:
 518         case eConnect:
 519         case eTerminateConnection:
 520         case eAbort:
 521                 /// TODO: WHUT?
 522                 break;
 523         }
 524 }
 525
 526 static void
 527 IO_Timeout_callback(struct ev_loop *loop, ev_timer *watcher, int revents)
 528 {
 529         AsyncIO *IO = watcher->data;
 530
 531         ev_timer_stop (event_base, &IO->rw_timeout);
 532         become_session(IO->CitContext);
 533
 534         if (IO->SendBuf.fd != 0)
 535         {
 536                 ev_io_stop(event_base, &IO->send_event);
 537                 ev_io_stop(event_base, &IO->recv_event);
 538                 ev_timer_stop (event_base, &IO->rw_timeout);
 539                 close(IO->SendBuf.fd);
 540                 IO->SendBuf.fd = IO->RecvBuf.fd = 0;
 541         }
 542
 543         assert(IO->Timeout);
 544         switch (IO->Timeout(IO))
 545         {
 546         case eAbort:
 547                 ShutDownCLient(IO);
 548         default:
 549                 break;
 550         }
 551 }
 552
 553 static void
 554 IO_connfail_callback(struct ev_loop *loop, ev_timer *watcher, int revents)
 555 {
 556         AsyncIO *IO = watcher->data;
 557
 558         ev_timer_stop (event_base, &IO->conn_fail);
 559
 560         if (IO->SendBuf.fd != 0)
 561         {
 562                 ev_io_stop(loop, &IO->conn_event);
 563                 ev_io_stop(event_base, &IO->send_event);
 564                 ev_io_stop(event_base, &IO->recv_event);
 565                 ev_timer_stop (event_base, &IO->rw_timeout);
 566                 close(IO->SendBuf.fd);
 567                 IO->SendBuf.fd = IO->RecvBuf.fd = 0;
 568         }
 569         become_session(IO->CitContext);
 570
 571         assert(IO->ConnFail);
 572         switch (IO->ConnFail(IO))
 573         {
 574         case eAbort:
 575                 ShutDownCLient(IO);
 576         default:
 577                 break;
 578
 579         }
 580 }
 581
 582 static void
 583 IO_connfailimmediate_callback(struct ev_loop *loop,
 584                               ev_idle *watcher,
 585                               int revents)
 586 {
 587         AsyncIO *IO = watcher->data;
 588
 589         ev_idle_stop (event_base, &IO->conn_fail_immediate);
 590
 591         if (IO->SendBuf.fd != 0)
 592         {
 593                 close(IO->SendBuf.fd);
 594                 IO->SendBuf.fd = IO->RecvBuf.fd = 0;
 595         }
 596         become_session(IO->CitContext);
 597
 598         assert(IO->ConnFail);
 599         switch (IO->ConnFail(IO))
 600         {
 601         case eAbort:
 602                 ShutDownCLient(IO);
 603         default:
 604                 break;
 605
 606         }
 607 }
 608
 609 static void
 610 IO_connestd_callback(struct ev_loop *loop, ev_io *watcher, int revents)
 611 {
 612         AsyncIO *IO = watcher->data;
 613
 614         ev_io_stop(loop, &IO->conn_event);
 615         ev_timer_stop (event_base, &IO->conn_fail);
 616         set_start_callback(loop, IO, revents);
 617 }
 618 static void
 619 IO_recv_callback(struct ev_loop *loop, ev_io *watcher, int revents)
 620 {
 621         const char *errmsg;
 622         ssize_t nbytes;
 623         AsyncIO *IO = watcher->data;
 624
 625         switch (IO->NextState) {
 626         case eReadFile:
 627                 nbytes = FileRecvChunked(&IO->IOB, &errmsg);
 628                 if (nbytes < 0)
 629                         StrBufPlain(IO->ErrMsg, errmsg, -1);
 630                 else
 631                 {
 632                         if (IO->IOB.ChunkSendRemain == 0)
 633                         {
 634                                 IO->NextState = eSendReply;
 635                         }
 636                         else
 637                                 return;
 638                 }
 639                 break;
 640         default:
 641                 nbytes = StrBuf_read_one_chunk_callback(watcher->fd,
 642                                                         0 /*TODO */,
 643                                                         &IO->RecvBuf);
 644                 break;
 645         }
 646
 647 #ifdef BIGBAD_IODBG
 648         {
 649                 long nbytes;
 650                 int rv = 0;
 651                 char fn [SIZ];
 652                 FILE *fd;
 653                 const char *pch = ChrPtr(IO->RecvBuf.Buf);
 654                 const char *pchh = IO->RecvBuf.ReadWritePointer;
 655
 656                 if (pchh == NULL)
 657                         pchh = pch;
 658
 659                 nbytes = StrLength(IO->RecvBuf.Buf) - (pchh - pch);
 660                 snprintf(fn, SIZ, "/tmp/foolog_ev_%s.%d",
 661                          ((CitContext*)(IO->CitContext))->ServiceName,
 662                          IO->SendBuf.fd);
 663
 664                 fd = fopen(fn, "a+");
 665                 fprintf(fd, "Read: BufSize: %ld BufContent: [",
 666                         nbytes);
 667                 rv = fwrite(pchh, nbytes, 1, fd);
 668                 if (!rv) printf("failed to write debug to %s!\n", fn);
 669                 fprintf(fd, "]\n");
 670                 fclose(fd);
 671         }
 672 #endif
 673         if (nbytes > 0) {
 674                 HandleInbound(IO);
 675         } else if (nbytes == 0) {
 676                 assert(IO->Timeout);
 677
 678                 switch (IO->Timeout(IO))
 679                 {
 680                 case eAbort:
 681                         ShutDownCLient(IO);
 682                 default:
 683                         break;
 684                 }
 685                 return;
 686         } else if (nbytes == -1) {
 687                 // FD is gone. kick it.
 688                 StopClientWatchers(IO);
 689                 EV_syslog(LOG_DEBUG,
 690                           "EVENT: Socket Invalid! %s \n",
 691                           strerror(errno));
 692                 ShutDownCLient(IO);
 693                 return;
 694         }
 695 }
 696
 697 void
 698 IO_postdns_callback(struct ev_loop *loop, ev_idle *watcher, int revents)
 699 {
 700         AsyncIO *IO = watcher->data;
 701         EV_syslog(LOG_DEBUG, "event: %s\n", __FUNCTION__);
 702         become_session(IO->CitContext);
 703         assert(IO->DNS.Fail);
 704         assert(IO->DNS.Query->PostDNS);
 705         switch (IO->DNS.Query->PostDNS(IO))
 706         {
 707         case eAbort:
 708                 switch (IO->DNS.Fail(IO)) {
 709                 case eAbort:
 710                         ShutDownCLient(IO);
 711                 default:
 712                         break;
 713                 }
 714         default:
 715                 break;
 716         }
 717 }
 718
 719
 720 eNextState EvConnectSock(AsyncIO *IO,
 721                          double conn_timeout,
 722                          double first_rw_timeout,
 723                          int ReadFirst)
 724 {
 725         int fdflags;
 726         int rc = -1;
 727
 728         become_session(IO->CitContext);
 729
 730         if (ReadFirst) {
 731                 IO->NextState = eReadMessage;
 732         }
 733         else {
 734                 IO->NextState = eSendReply;
 735         }
 736
 737         IO->SendBuf.fd = IO->RecvBuf.fd =
 738                 socket(
 739                         (IO->ConnectMe->IPv6)?PF_INET6:PF_INET,
 740                         SOCK_STREAM,
 741                         IPPROTO_TCP);
 742
 743         if (IO->SendBuf.fd < 0) {
 744                 EV_syslog(LOG_ERR,
 745                           "EVENT: socket() failed: %s\n",
 746                           strerror(errno));
 747
 748                 StrBufPrintf(IO->ErrMsg,
 749                              "Failed to create socket: %s",
 750                              strerror(errno));
 751                 return eAbort;
 752         }
 753         fdflags = fcntl(IO->SendBuf.fd, F_GETFL);
 754         if (fdflags < 0) {
 755                 EV_syslog(LOG_DEBUG,
 756                           "EVENT: unable to get socket flags! %s \n",
 757                           strerror(errno));
 758                 StrBufPrintf(IO->ErrMsg,
 759                              "Failed to get socket flags: %s",
 760                              strerror(errno));
 761                 return eAbort;
 762         }
 763         fdflags = fdflags | O_NONBLOCK;
 764         if (fcntl(IO->SendBuf.fd, F_SETFL, fdflags) < 0) {
 765                 EV_syslog(
 766                         LOG_DEBUG,
 767                         "EVENT: unable to set socket nonblocking flags! %s \n",
 768                         strerror(errno));
 769                 StrBufPrintf(IO->ErrMsg,
 770                              "Failed to set socket flags: %s",
 771                              strerror(errno));
 772                 close(IO->SendBuf.fd);
 773                 IO->SendBuf.fd = IO->RecvBuf.fd = -1;
 774                 return eAbort;
 775         }
 776 /* TODO: maye we could use offsetof() to calc the position of data...
 777  * http://doc.dvgu.ru/devel/ev.html#associating_custom_data_with_a_watcher
 778  */
 779         ev_io_init(&IO->recv_event, IO_recv_callback, IO->RecvBuf.fd, EV_READ);
 780         IO->recv_event.data = IO;
 781         ev_io_init(&IO->send_event, IO_send_callback, IO->SendBuf.fd, EV_WRITE);
 782         IO->send_event.data = IO;
 783
 784         ev_timer_init(&IO->conn_fail, IO_connfail_callback, conn_timeout, 0);
 785         IO->conn_fail.data = IO;
 786         ev_timer_init(&IO->rw_timeout, IO_Timeout_callback, first_rw_timeout,0);
 787         IO->rw_timeout.data = IO;
 788
 789
 790         /* for debugging you may bypass it like this:
 791          * IO->Addr.sin_addr.s_addr = inet_addr("127.0.0.1");
 792          * ((struct sockaddr_in)IO->ConnectMe->Addr).sin_addr.s_addr =
 793          *   inet_addr("127.0.0.1");
 794          */
 795         if (IO->ConnectMe->IPv6)
 796                 rc = connect(IO->SendBuf.fd,
 797                              &IO->ConnectMe->Addr,
 798                              sizeof(struct sockaddr_in6));
 799         else
 800                 rc = connect(IO->SendBuf.fd,
 801                              (struct sockaddr_in *)&IO->ConnectMe->Addr,
 802                              sizeof(struct sockaddr_in));
 803
 804         if (rc >= 0){
 805                 EVM_syslog(LOG_DEBUG, "connect() immediate success.\n");
 806                 set_start_callback(event_base, IO, 0);
 807                 ev_timer_start(event_base, &IO->rw_timeout);
 808                 return IO->NextState;
 809         }
 810         else if (errno == EINPROGRESS) {
 811                 EVM_syslog(LOG_DEBUG, "connect() have to wait now.\n");
 812
 813                 ev_io_init(&IO->conn_event,
 814                            IO_connestd_callback,
 815                            IO->SendBuf.fd,
 816                            EV_READ|EV_WRITE);
 817
 818                 IO->conn_event.data = IO;
 819
 820                 ev_io_start(event_base, &IO->conn_event);
 821                 ev_timer_start(event_base, &IO->conn_fail);
 822                 return IO->NextState;
 823         }
 824         else {
 825                 ev_idle_init(&IO->conn_fail_immediate,
 826                              IO_connfailimmediate_callback);
 827                 IO->conn_fail_immediate.data = IO;
 828                 ev_idle_start(event_base, &IO->conn_fail_immediate);
 829
 830                 EV_syslog(LOG_ERR, "connect() failed: %s\n", strerror(errno));
 831                 StrBufPrintf(IO->ErrMsg,
 832                              "Failed to connect: %s",
 833                              strerror(errno));
 834                 return IO->NextState;
 835         }
 836         return IO->NextState;
 837 }
 838
 839 void SetNextTimeout(AsyncIO *IO, double timeout)
 840 {
 841         IO->rw_timeout.repeat = timeout;
 842         ev_timer_again (event_base,  &IO->rw_timeout);
 843 }
 844
 845
 846 eNextState ReAttachIO(AsyncIO *IO,
 847                       void *pData,
 848                       int ReadFirst)
 849 {
 850         IO->Data = pData;
 851         become_session(IO->CitContext);
 852         ev_cleanup_start(event_base, &IO->abort_by_shutdown);
 853         if (ReadFirst) {
 854                 IO->NextState = eReadMessage;
 855         }
 856         else {
 857                 IO->NextState = eSendReply;
 858         }
 859         set_start_callback(event_base, IO, 0);
 860
 861         return IO->NextState;
 862 }
 863
 864 void InitIOStruct(AsyncIO *IO,
 865                   void *Data,
 866                   eNextState NextState,
 867                   IO_LineReaderCallback LineReader,
 868                   IO_CallBack DNS_Fail,
 869                   IO_CallBack SendDone,
 870                   IO_CallBack ReadDone,
 871                   IO_CallBack Terminate,
 872                   IO_CallBack ConnFail,
 873                   IO_CallBack Timeout,
 874                   IO_CallBack ShutdownAbort)
 875 {
 876         IO->Data          = Data;
 877
 878         IO->CitContext    = CloneContext(CC);
 879         ((CitContext *)IO->CitContext)->session_specific_data = (char*) Data;
 880
 881         IO->NextState     = NextState;
 882
 883         IO->SendDone      = SendDone;
 884         IO->ReadDone      = ReadDone;
 885         IO->Terminate     = Terminate;
 886         IO->LineReader    = LineReader;
 887         IO->ConnFail      = ConnFail;
 888         IO->Timeout       = Timeout;
 889         IO->ShutdownAbort = ShutdownAbort;
 890
 891         IO->DNS.Fail      = DNS_Fail;
 892
 893         IO->SendBuf.Buf   = NewStrBufPlain(NULL, 1024);
 894         IO->RecvBuf.Buf   = NewStrBufPlain(NULL, 1024);
 895         IO->IOBuf         = NewStrBuf();
 896
 897 }
 898
 899 extern int evcurl_init(AsyncIO *IO);
 900
 901 int InitcURLIOStruct(AsyncIO *IO,
 902                      void *Data,
 903                      const char* Desc,
 904                      IO_CallBack SendDone,
 905                      IO_CallBack Terminate,
 906                      IO_CallBack ShutdownAbort)
 907 {
 908         IO->Data          = Data;
 909
 910         IO->CitContext    = CloneContext(CC);
 911         ((CitContext *)IO->CitContext)->session_specific_data = (char*) Data;
 912
 913         IO->SendDone = SendDone;
 914         IO->Terminate = Terminate;
 915         IO->ShutdownAbort = ShutdownAbort;
 916
 917         strcpy(IO->HttpReq.errdesc, Desc);
 918
 919
 920         return  evcurl_init(IO);
 921
 922 }