citadel/event_client.c

   1 /*
   2  * Copyright (c) 1998-2012 by the citadel.org team
   3  *
   4  * This program is open source software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License, version 3.
   6  *
   7  * This program is distributed in the hope that it will be useful,
   8  * but WITHOUT ANY WARRANTY; without even the implied warranty of
   9  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  10  * GNU General Public License for more details.
  11  */
  12
  13 #include "sysdep.h"
  14 #include <stdlib.h>
  15 #include <unistd.h>
  16 #include <stdio.h>
  17 #include <termios.h>
  18 #include <fcntl.h>
  19 #include <signal.h>
  20 #include <pwd.h>
  21 #include <errno.h>
  22 #include <sys/types.h>
  23 #include <syslog.h>
  24
  25 #if TIME_WITH_SYS_TIME
  26 # include <sys/time.h>
  27 # include <time.h>
  28 #else
  29 # if HAVE_SYS_TIME_H
  30 #  include <sys/time.h>
  31 # else
  32 #  include <time.h>
  33 # endif
  34 #endif
  35 #include <sys/wait.h>
  36 #include <ctype.h>
  37 #include <string.h>
  38 #include <limits.h>
  39 #include <sys/socket.h>
  40 #include <netinet/in.h>
  41 #include <arpa/inet.h>
  42 #include <assert.h>
  43 #if HAVE_BACKTRACE
  44 #include <execinfo.h>
  45 #endif
  46
  47 #include <libcitadel.h>
  48 #include "citadel.h"
  49 #include "server.h"
  50 #include "citserver.h"
  51 #include "support.h"
  52 #include "config.h"
  53 #include "control.h"
  54 #include "user_ops.h"
  55 #include "database.h"
  56 #include "msgbase.h"
  57 #include "internet_addressing.h"
  58 #include "genstamp.h"
  59 #include "domain.h"
  60 #include "clientsocket.h"
  61 #include "locate_host.h"
  62 #include "citadel_dirs.h"
  63
  64 #include "event_client.h"
  65 #include "ctdl_module.h"
  66
  67 static void IO_Timeout_callback(struct ev_loop *loop, ev_timer *watcher, int revents);
  68 static void IO_abort_shutdown_callback(struct ev_loop *loop,
  69                                        ev_cleanup *watcher,
  70                                        int revents);
  71
  72
  73 /*------------------------------------------------------------------------------
  74  *                              Server DB IO
  75  *----------------------------------------------------------------------------*/
  76 extern int evdb_count;
  77 extern pthread_mutex_t DBEventQueueMutex;
  78 extern pthread_mutex_t DBEventExitQueueMutex;
  79 extern HashList *DBInboundEventQueue;
  80 extern struct ev_loop *event_db;
  81 extern ev_async DBAddJob;
  82 extern ev_async DBExitEventLoop;
  83
  84 eNextState QueueDBOperation(AsyncIO *IO, IO_CallBack CB)
  85 {
  86         IOAddHandler *h;
  87         int i;
  88
  89         h = (IOAddHandler*)malloc(sizeof(IOAddHandler));
  90         h->IO = IO;
  91         h->EvAttch = CB;
  92         ev_cleanup_init(&IO->db_abort_by_shutdown,
  93                         IO_abort_shutdown_callback);
  94         IO->db_abort_by_shutdown.data = IO;
  95
  96         pthread_mutex_lock(&DBEventQueueMutex);
  97         if (DBInboundEventQueue == NULL)
  98         {
  99                 /* shutting down... */
 100                 free(h);
 101                 EVM_syslog(LOG_DEBUG, "DBEVENT Q exiting.\n");
 102                 pthread_mutex_unlock(&DBEventQueueMutex);
 103                 return eAbort;
 104         }
 105         EVM_syslog(LOG_DEBUG, "DBEVENT Q\n");
 106         i = ++evdb_count ;
 107         Put(DBInboundEventQueue, IKEY(i), h, NULL);
 108         pthread_mutex_unlock(&DBEventQueueMutex);
 109
 110         pthread_mutex_lock(&DBEventExitQueueMutex);
 111         if (event_db == NULL)
 112         {
 113                 pthread_mutex_unlock(&DBEventExitQueueMutex);
 114                 return eAbort;
 115         }
 116         ev_async_send (event_db, &DBAddJob);
 117         pthread_mutex_unlock(&DBEventExitQueueMutex);
 118
 119         EVM_syslog(LOG_DEBUG, "DBEVENT Q Done.\n");
 120         return eDBQuery;
 121 }
 122
 123 void StopDBWatchers(AsyncIO *IO)
 124 {
 125         ev_cleanup_stop(event_db, &IO->db_abort_by_shutdown);
 126         ev_idle_stop(event_db, &IO->db_unwind_stack);
 127 }
 128
 129 void ShutDownDBCLient(AsyncIO *IO)
 130 {
 131         CitContext *Ctx =IO->CitContext;
 132         become_session(Ctx);
 133
 134         EVM_syslog(LOG_DEBUG, "DBEVENT Terminating.\n");
 135         StopDBWatchers(IO);
 136
 137         assert(IO->DBTerminate);
 138         IO->DBTerminate(IO);
 139 }
 140
 141 void
 142 DB_PerformNext(struct ev_loop *loop, ev_idle *watcher, int revents)
 143 {
 144         AsyncIO *IO = watcher->data;
 145         IO->Now = ev_now(event_db);
 146         EV_syslog(LOG_DEBUG, "%s()", __FUNCTION__);
 147         become_session(IO->CitContext);
 148
 149         ev_idle_stop(event_db, &IO->db_unwind_stack);
 150
 151         assert(IO->NextDBOperation);
 152         switch (IO->NextDBOperation(IO))
 153         {
 154         case eDBQuery:
 155                 break;
 156         case eSendDNSQuery:
 157         case eReadDNSReply:
 158         case eConnect:
 159         case eSendReply:
 160         case eSendMore:
 161         case eSendFile:
 162         case eReadMessage:
 163         case eReadMore:
 164         case eReadPayload:
 165         case eReadFile:
 166                 ev_cleanup_stop(loop, &IO->db_abort_by_shutdown);
 167                 break;
 168         case eTerminateConnection:
 169         case eAbort:
 170                 ev_idle_stop(event_db, &IO->db_unwind_stack);
 171                 ev_cleanup_stop(loop, &IO->db_abort_by_shutdown);
 172                 ShutDownDBCLient(IO);
 173         }
 174 }
 175
 176 eNextState NextDBOperation(AsyncIO *IO, IO_CallBack CB)
 177 {
 178         IO->NextDBOperation = CB;
 179         ev_idle_init(&IO->db_unwind_stack,
 180                      DB_PerformNext);
 181         IO->db_unwind_stack.data = IO;
 182         ev_idle_start(event_db, &IO->db_unwind_stack);
 183         return eDBQuery;
 184 }
 185
 186 /*------------------------------------------------------------------------------
 187  *                      Client IO
 188  *----------------------------------------------------------------------------*/
 189 extern int evbase_count;
 190 extern pthread_mutex_t EventQueueMutex;
 191 extern pthread_mutex_t EventExitQueueMutex;
 192 extern HashList *InboundEventQueue;
 193 extern struct ev_loop *event_base;
 194 extern ev_async AddJob;
 195 extern ev_async ExitEventLoop;
 196
 197 static void IO_abort_shutdown_callback(struct ev_loop *loop,
 198                                        ev_cleanup *watcher,
 199                                        int revents)
 200 {
 201         AsyncIO *IO = watcher->data;
 202         EV_syslog(LOG_DEBUG, "EVENT Q: %s\n", __FUNCTION__);
 203         IO->Now = ev_now(event_base);
 204         assert(IO->ShutdownAbort);
 205         IO->ShutdownAbort(IO);
 206 }
 207
 208
 209 eNextState QueueEventContext(AsyncIO *IO, IO_CallBack CB)
 210 {
 211         IOAddHandler *h;
 212         int i;
 213
 214         h = (IOAddHandler*)malloc(sizeof(IOAddHandler));
 215         h->IO = IO;
 216         h->EvAttch = CB;
 217         ev_cleanup_init(&IO->abort_by_shutdown,
 218                         IO_abort_shutdown_callback);
 219         IO->abort_by_shutdown.data = IO;
 220
 221         pthread_mutex_lock(&EventQueueMutex);
 222         if (InboundEventQueue == NULL)
 223         {
 224                 free(h);
 225                 /* shutting down... */
 226                 EVM_syslog(LOG_DEBUG, "EVENT Q exiting.\n");
 227                 pthread_mutex_unlock(&EventQueueMutex);
 228                 return eAbort;
 229         }
 230         EVM_syslog(LOG_DEBUG, "EVENT Q\n");
 231         i = ++evbase_count;
 232         Put(InboundEventQueue, IKEY(i), h, NULL);
 233         pthread_mutex_unlock(&EventQueueMutex);
 234
 235         pthread_mutex_lock(&EventExitQueueMutex);
 236         if (event_base == NULL) {
 237                 pthread_mutex_unlock(&EventExitQueueMutex);
 238                 return eAbort;
 239         }
 240         ev_async_send (event_base, &AddJob);
 241         pthread_mutex_unlock(&EventExitQueueMutex);
 242         EVM_syslog(LOG_DEBUG, "EVENT Q Done.\n");
 243         return eSendReply;
 244 }
 245
 246 extern eNextState evcurl_handle_start(AsyncIO *IO);
 247
 248 eNextState QueueCurlContext(AsyncIO *IO)
 249 {
 250         IOAddHandler *h;
 251         int i;
 252
 253         h = (IOAddHandler*)malloc(sizeof(IOAddHandler));
 254         h->IO = IO;
 255         h->EvAttch = evcurl_handle_start;
 256
 257         pthread_mutex_lock(&EventQueueMutex);
 258         if (InboundEventQueue == NULL)
 259         {
 260                 /* shutting down... */
 261                 free(h);
 262                 EVM_syslog(LOG_DEBUG, "EVENT Q exiting.\n");
 263                 pthread_mutex_unlock(&EventQueueMutex);
 264                 return eAbort;
 265         }
 266
 267         EVM_syslog(LOG_DEBUG, "EVENT Q\n");
 268         i = ++evbase_count;
 269         Put(InboundEventQueue, IKEY(i), h, NULL);
 270         pthread_mutex_unlock(&EventQueueMutex);
 271
 272         pthread_mutex_lock(&EventExitQueueMutex);
 273         if (event_base == NULL) {
 274                 pthread_mutex_unlock(&EventExitQueueMutex);
 275                 return eAbort;
 276         }
 277         ev_async_send (event_base, &AddJob);
 278         pthread_mutex_unlock(&EventExitQueueMutex);
 279
 280         EVM_syslog(LOG_DEBUG, "EVENT Q Done.\n");
 281         return eSendReply;
 282 }
 283
 284 void DestructCAres(AsyncIO *IO);
 285 void FreeAsyncIOContents(AsyncIO *IO)
 286 {
 287         CitContext *Ctx = IO->CitContext;
 288
 289         FreeStrBuf(&IO->IOBuf);
 290         FreeStrBuf(&IO->SendBuf.Buf);
 291         FreeStrBuf(&IO->RecvBuf.Buf);
 292
 293         DestructCAres(IO);
 294
 295         FreeURL(&IO->ConnectMe);
 296         FreeStrBuf(&IO->HttpReq.ReplyData);
 297
 298         if (Ctx) {
 299                 Ctx->state = CON_IDLE;
 300                 Ctx->kill_me = 1;
 301         }
 302 }
 303
 304
 305 void StopClientWatchers(AsyncIO *IO, int CloseFD)
 306 {
 307         ev_timer_stop (event_base, &IO->rw_timeout);
 308         ev_timer_stop(event_base, &IO->conn_fail);
 309         ev_idle_stop(event_base, &IO->unwind_stack);
 310         ev_cleanup_stop(event_base, &IO->abort_by_shutdown);
 311
 312         ev_io_stop(event_base, &IO->conn_event);
 313         ev_io_stop(event_base, &IO->send_event);
 314         ev_io_stop(event_base, &IO->recv_event);
 315
 316         if (CloseFD && (IO->SendBuf.fd > 0)) {
 317                 close(IO->SendBuf.fd);
 318                 IO->SendBuf.fd = -1;
 319                 IO->RecvBuf.fd = -1;
 320         }
 321 }
 322
 323 void StopCurlWatchers(AsyncIO *IO)
 324 {
 325         ev_timer_stop (event_base, &IO->rw_timeout);
 326         ev_timer_stop(event_base, &IO->conn_fail);
 327         ev_idle_stop(event_base, &IO->unwind_stack);
 328         ev_cleanup_stop(event_base, &IO->abort_by_shutdown);
 329
 330         ev_io_stop(event_base, &IO->conn_event);
 331         ev_io_stop(event_base, &IO->send_event);
 332         ev_io_stop(event_base, &IO->recv_event);
 333
 334         if (IO->SendBuf.fd != 0) {
 335                 close(IO->SendBuf.fd);
 336         }
 337         IO->SendBuf.fd = 0;
 338         IO->RecvBuf.fd = 0;
 339 }
 340
 341 void ShutDownCLient(AsyncIO *IO)
 342 {
 343         CitContext *Ctx =IO->CitContext;
 344         become_session(Ctx);
 345
 346         EVM_syslog(LOG_DEBUG, "EVENT Terminating \n");
 347
 348         StopClientWatchers(IO, 1);
 349
 350         if (IO->DNS.Channel != NULL) {
 351                 ares_destroy(IO->DNS.Channel);
 352                 EV_DNS_LOG_STOP(DNS.recv_event);
 353                 EV_DNS_LOG_STOP(DNS.send_event);
 354                 ev_io_stop(event_base, &IO->DNS.recv_event);
 355                 ev_io_stop(event_base, &IO->DNS.send_event);
 356                 IO->DNS.Channel = NULL;
 357         }
 358         assert(IO->Terminate);
 359         IO->Terminate(IO);
 360 }
 361
 362 void PostInbound(AsyncIO *IO)
 363 {
 364         switch (IO->NextState) {
 365         case eSendFile:
 366                 ev_io_start(event_base, &IO->send_event);
 367                 break;
 368         case eSendReply:
 369         case eSendMore:
 370                 assert(IO->SendDone);
 371                 IO->NextState = IO->SendDone(IO);
 372                 ev_io_start(event_base, &IO->send_event);
 373                 break;
 374         case eReadPayload:
 375         case eReadMore:
 376         case eReadFile:
 377                 ev_io_start(event_base, &IO->recv_event);
 378                 break;
 379         case eTerminateConnection:
 380                 ShutDownCLient(IO);
 381                 break;
 382         case eAbort:
 383                 ShutDownCLient(IO);
 384                 break;
 385         case eSendDNSQuery:
 386         case eReadDNSReply:
 387         case eDBQuery:
 388         case eConnect:
 389         case eReadMessage:
 390                 break;
 391         }
 392 }
 393 eReadState HandleInbound(AsyncIO *IO)
 394 {
 395         const char *Err = NULL;
 396         eReadState Finished = eBufferNotEmpty;
 397
 398         become_session(IO->CitContext);
 399
 400         while ((Finished == eBufferNotEmpty) &&
 401                ((IO->NextState == eReadMessage)||
 402                 (IO->NextState == eReadMore)||
 403                 (IO->NextState == eReadFile)||
 404                 (IO->NextState == eReadPayload)))
 405         {
 406                 /* Reading lines...
 407                  * lex line reply in callback,
 408                  * or do it ourselves.
 409                  * i.e. as nnn-blabla means continue reading in SMTP
 410                  */
 411                 if ((IO->NextState == eReadFile) &&
 412                     (Finished == eBufferNotEmpty))
 413                 {
 414                         Finished = WriteIOBAlreadyRead(&IO->IOB, &Err);
 415                         if (Finished == eReadSuccess)
 416                         {
 417                                 IO->NextState = eSendReply;
 418                         }
 419                 }
 420                 else if (IO->LineReader)
 421                         Finished = IO->LineReader(IO);
 422                 else
 423                         Finished = StrBufChunkSipLine(IO->IOBuf,
 424                                                       &IO->RecvBuf);
 425
 426                 switch (Finished) {
 427                 case eMustReadMore: /// read new from socket...
 428                         break;
 429                 case eBufferNotEmpty: /* shouldn't happen... */
 430                 case eReadSuccess: /// done for now...
 431                         break;
 432                 case eReadFail: /// WHUT?
 433                                 ///todo: shut down!
 434                         break;
 435                 }
 436
 437                 if (Finished != eMustReadMore) {
 438                         assert(IO->ReadDone);
 439                         ev_io_stop(event_base, &IO->recv_event);
 440                         IO->NextState = IO->ReadDone(IO);
 441                         Finished = StrBufCheckBuffer(&IO->RecvBuf);
 442                 }
 443         }
 444
 445         PostInbound(IO);
 446
 447         return Finished;
 448 }
 449
 450
 451 static void
 452 IO_send_callback(struct ev_loop *loop, ev_io *watcher, int revents)
 453 {
 454         int rc;
 455         AsyncIO *IO = watcher->data;
 456         const char *errmsg = NULL;
 457
 458         IO->Now = ev_now(event_base);
 459         become_session(IO->CitContext);
 460 #ifdef BIGBAD_IODBG
 461         {
 462                 int rv = 0;
 463                 char fn [SIZ];
 464                 FILE *fd;
 465                 const char *pch = ChrPtr(IO->SendBuf.Buf);
 466                 const char *pchh = IO->SendBuf.ReadWritePointer;
 467                 long nbytes;
 468
 469                 if (pchh == NULL)
 470                         pchh = pch;
 471
 472                 nbytes = StrLength(IO->SendBuf.Buf) - (pchh - pch);
 473                 snprintf(fn, SIZ, "/tmp/foolog_ev_%s.%d",
 474                          ((CitContext*)(IO->CitContext))->ServiceName,
 475                          IO->SendBuf.fd);
 476
 477                 fd = fopen(fn, "a+");
 478                 fprintf(fd, "Send: BufSize: %ld BufContent: [",
 479                         nbytes);
 480                 rv = fwrite(pchh, nbytes, 1, fd);
 481                 if (!rv) printf("failed to write debug to %s!\n", fn);
 482                 fprintf(fd, "]\n");
 483 #endif
 484                 switch (IO->NextState) {
 485                 case eSendFile:
 486                         rc = FileSendChunked(&IO->IOB, &errmsg);
 487                         if (rc < 0)
 488                                 StrBufPlain(IO->ErrMsg, errmsg, -1);
 489                         break;
 490                 default:
 491                         rc = StrBuf_write_one_chunk_callback(IO->SendBuf.fd,
 492                                                              0,
 493                                                              &IO->SendBuf);
 494                 }
 495
 496 #ifdef BIGBAD_IODBG
 497                 fprintf(fd, "Sent: BufSize: %d bytes.\n", rc);
 498                 fclose(fd);
 499         }
 500 #endif
 501         if (rc == 0)
 502         {
 503                 ev_io_stop(event_base, &IO->send_event);
 504                 switch (IO->NextState) {
 505                 case eSendMore:
 506                         assert(IO->SendDone);
 507                         IO->NextState = IO->SendDone(IO);
 508
 509                         if ((IO->NextState == eTerminateConnection) ||
 510                             (IO->NextState == eAbort) )
 511                                 ShutDownCLient(IO);
 512                         else {
 513                                 ev_io_start(event_base, &IO->send_event);
 514                         }
 515                         break;
 516                 case eSendFile:
 517                         if (IO->IOB.ChunkSendRemain > 0) {
 518                                 ev_io_start(event_base, &IO->recv_event);
 519                                 SetNextTimeout(IO, 100.0);
 520
 521                         } else {
 522                                 assert(IO->ReadDone);
 523                                 IO->NextState = IO->ReadDone(IO);
 524                                 switch(IO->NextState) {
 525                                 case eSendDNSQuery:
 526                                 case eReadDNSReply:
 527                                 case eDBQuery:
 528                                 case eConnect:
 529                                         break;
 530                                 case eSendReply:
 531                                 case eSendMore:
 532                                 case eSendFile:
 533                                         ev_io_start(event_base,
 534                                                     &IO->send_event);
 535                                         break;
 536                                 case eReadMessage:
 537                                 case eReadMore:
 538                                 case eReadPayload:
 539                                 case eReadFile:
 540                                         break;
 541                                 case eTerminateConnection:
 542                                 case eAbort:
 543                                         break;
 544                                 }
 545                         }
 546                         break;
 547                 case eSendReply:
 548                     if (StrBufCheckBuffer(&IO->SendBuf) != eReadSuccess)
 549                         break;
 550                     IO->NextState = eReadMore;
 551                 case eReadMore:
 552                 case eReadMessage:
 553                 case eReadPayload:
 554                 case eReadFile:
 555                         if (StrBufCheckBuffer(&IO->RecvBuf) == eBufferNotEmpty)
 556                         {
 557                                 HandleInbound(IO);
 558                         }
 559                         else {
 560                                 ev_io_start(event_base, &IO->recv_event);
 561                         }
 562
 563                         break;
 564                 case eDBQuery:
 565                         /*
 566                          * we now live in another queue,
 567                          * so we have to unregister.
 568                          */
 569                         ev_cleanup_stop(loop, &IO->abort_by_shutdown);
 570                         break;
 571                 case eSendDNSQuery:
 572                 case eReadDNSReply:
 573                 case eConnect:
 574                 case eTerminateConnection:
 575                 case eAbort:
 576                         break;
 577                 }
 578         }
 579         else if (rc < 0) {
 580                 if (errno != EAGAIN) {
 581                         StopClientWatchers(IO, 1);
 582                         EV_syslog(LOG_DEBUG,
 583                                   "EVENT: Socket Invalid! [%d] [%s] [%d]\n",
 584                                   errno, strerror(errno), IO->SendBuf.fd);
 585                         StrBufPrintf(IO->ErrMsg,
 586                                      "Socket Invalid! [%s]",
 587                                      strerror(errno));
 588                         SetNextTimeout(IO, 0.0);
 589                 }
 590         }
 591         /* else : must write more. */
 592 }
 593 static void
 594 set_start_callback(struct ev_loop *loop, AsyncIO *IO, int revents)
 595 {
 596         ev_timer_stop(event_base, &IO->conn_fail);
 597         ev_timer_start(event_base, &IO->rw_timeout);
 598
 599         switch(IO->NextState) {
 600         case eReadMore:
 601         case eReadMessage:
 602         case eReadFile:
 603                 StrBufAppendBufPlain(IO->ErrMsg, HKEY("[while waiting for greeting]"), 0);
 604                 ev_io_start(event_base, &IO->recv_event);
 605                 break;
 606         case eSendReply:
 607         case eSendMore:
 608         case eReadPayload:
 609         case eSendFile:
 610                 become_session(IO->CitContext);
 611                 IO_send_callback(loop, &IO->send_event, revents);
 612                 break;
 613         case eDBQuery:
 614         case eSendDNSQuery:
 615         case eReadDNSReply:
 616         case eConnect:
 617         case eTerminateConnection:
 618         case eAbort:
 619                 /// TODO: WHUT?
 620                 break;
 621         }
 622 }
 623
 624 static void
 625 IO_Timeout_callback(struct ev_loop *loop, ev_timer *watcher, int revents)
 626 {
 627         AsyncIO *IO = watcher->data;
 628
 629         IO->Now = ev_now(event_base);
 630         ev_timer_stop (event_base, &IO->rw_timeout);
 631         become_session(IO->CitContext);
 632
 633         if (IO->SendBuf.fd != 0)
 634         {
 635                 ev_io_stop(event_base, &IO->send_event);
 636                 ev_io_stop(event_base, &IO->recv_event);
 637                 ev_timer_stop (event_base, &IO->rw_timeout);
 638                 close(IO->SendBuf.fd);
 639                 IO->SendBuf.fd = IO->RecvBuf.fd = 0;
 640         }
 641
 642         assert(IO->Timeout);
 643         switch (IO->Timeout(IO))
 644         {
 645         case eAbort:
 646                 ShutDownCLient(IO);
 647         default:
 648                 break;
 649         }
 650 }
 651
 652 static void
 653 IO_connfail_callback(struct ev_loop *loop, ev_timer *watcher, int revents)
 654 {
 655         AsyncIO *IO = watcher->data;
 656
 657         IO->Now = ev_now(event_base);
 658         ev_timer_stop (event_base, &IO->conn_fail);
 659
 660         if (IO->SendBuf.fd != 0)
 661         {
 662                 ev_io_stop(loop, &IO->conn_event);
 663                 ev_io_stop(event_base, &IO->send_event);
 664                 ev_io_stop(event_base, &IO->recv_event);
 665                 ev_timer_stop (event_base, &IO->rw_timeout);
 666                 close(IO->SendBuf.fd);
 667                 IO->SendBuf.fd = IO->RecvBuf.fd = 0;
 668         }
 669         become_session(IO->CitContext);
 670
 671         assert(IO->ConnFail);
 672         switch (IO->ConnFail(IO))
 673         {
 674         case eAbort:
 675                 ShutDownCLient(IO);
 676         default:
 677                 break;
 678
 679         }
 680 }
 681
 682 static void
 683 IO_connfailimmediate_callback(struct ev_loop *loop,
 684                               ev_idle *watcher,
 685                               int revents)
 686 {
 687         AsyncIO *IO = watcher->data;
 688
 689         IO->Now = ev_now(event_base);
 690         ev_idle_stop (event_base, &IO->conn_fail_immediate);
 691
 692         if (IO->SendBuf.fd != 0)
 693         {
 694                 close(IO->SendBuf.fd);
 695                 IO->SendBuf.fd = IO->RecvBuf.fd = 0;
 696         }
 697         become_session(IO->CitContext);
 698
 699         assert(IO->ConnFail);
 700         switch (IO->ConnFail(IO))
 701         {
 702         case eAbort:
 703                 ShutDownCLient(IO);
 704         default:
 705                 break;
 706
 707         }
 708 }
 709
 710 static void
 711 IO_connestd_callback(struct ev_loop *loop, ev_io *watcher, int revents)
 712 {
 713         AsyncIO *IO = watcher->data;
 714         int             so_err = 0;
 715         socklen_t       lon = sizeof(so_err);
 716         int             err;
 717
 718         IO->Now = ev_now(event_base);
 719         EVM_syslog(LOG_DEBUG, "connect() succeeded.\n");
 720
 721         ev_io_stop(loop, &IO->conn_event);
 722         ev_timer_stop(event_base, &IO->conn_fail);
 723
 724         err = getsockopt(IO->SendBuf.fd,
 725                          SOL_SOCKET,
 726                          SO_ERROR,
 727                          (void*)&so_err,
 728                          &lon);
 729
 730         if ((err == 0) && (so_err != 0))
 731         {
 732                 EV_syslog(LOG_DEBUG, "connect() failed [%d][%s]\n",
 733                           so_err,
 734                           strerror(so_err));
 735                 IO_connfail_callback(loop, &IO->conn_fail, revents);
 736
 737         }
 738         else
 739         {
 740                 EVM_syslog(LOG_DEBUG, "connect() succeeded\n");
 741                 set_start_callback(loop, IO, revents);
 742         }
 743 }
 744
 745 static void
 746 IO_recv_callback(struct ev_loop *loop, ev_io *watcher, int revents)
 747 {
 748         const char *errmsg;
 749         ssize_t nbytes;
 750         AsyncIO *IO = watcher->data;
 751
 752         IO->Now = ev_now(event_base);
 753         switch (IO->NextState) {
 754         case eReadFile:
 755                 nbytes = FileRecvChunked(&IO->IOB, &errmsg);
 756                 if (nbytes < 0)
 757                         StrBufPlain(IO->ErrMsg, errmsg, -1);
 758                 else
 759                 {
 760                         if (IO->IOB.ChunkSendRemain == 0)
 761                         {
 762                                 IO->NextState = eSendReply;
 763                                 assert(IO->ReadDone);
 764                                 ev_io_stop(event_base, &IO->recv_event);
 765                                 PostInbound(IO);
 766                                 return;
 767                         }
 768                         else
 769                                 return;
 770                 }
 771                 break;
 772         default:
 773                 nbytes = StrBuf_read_one_chunk_callback(IO->RecvBuf.fd,
 774                                                         0,
 775                                                         &IO->RecvBuf);
 776                 break;
 777         }
 778
 779 #ifdef BIGBAD_IODBG
 780         {
 781                 long nbytes;
 782                 int rv = 0;
 783                 char fn [SIZ];
 784                 FILE *fd;
 785                 const char *pch = ChrPtr(IO->RecvBuf.Buf);
 786                 const char *pchh = IO->RecvBuf.ReadWritePointer;
 787
 788                 if (pchh == NULL)
 789                         pchh = pch;
 790
 791                 nbytes = StrLength(IO->RecvBuf.Buf) - (pchh - pch);
 792                 snprintf(fn, SIZ, "/tmp/foolog_ev_%s.%d",
 793                          ((CitContext*)(IO->CitContext))->ServiceName,
 794                          IO->SendBuf.fd);
 795
 796                 fd = fopen(fn, "a+");
 797                 fprintf(fd, "Read: BufSize: %ld BufContent: [",
 798                         nbytes);
 799                 rv = fwrite(pchh, nbytes, 1, fd);
 800                 if (!rv) printf("failed to write debug to %s!\n", fn);
 801                 fprintf(fd, "]\n");
 802                 fclose(fd);
 803         }
 804 #endif
 805         if (nbytes > 0) {
 806                 HandleInbound(IO);
 807         } else if (nbytes == 0) {
 808                 SetNextTimeout(IO, 0.0);
 809                 return;
 810         } else if (nbytes == -1) {
 811                 if (errno != EAGAIN) {
 812                         // FD is gone. kick it.
 813                         StopClientWatchers(IO, 1);
 814                         EV_syslog(LOG_DEBUG,
 815                                   "EVENT: Socket Invalid! [%d] [%s] [%d]\n",
 816                                   errno, strerror(errno), IO->SendBuf.fd);
 817                         StrBufPrintf(IO->ErrMsg,
 818                                      "Socket Invalid! [%s]",
 819                                      strerror(errno));
 820                         SetNextTimeout(IO, 0.0);
 821                 }
 822                 return;
 823         }
 824 }
 825
 826 void
 827 IO_postdns_callback(struct ev_loop *loop, ev_idle *watcher, int revents)
 828 {
 829         AsyncIO *IO = watcher->data;
 830         IO->Now = ev_now(event_base);
 831         EV_syslog(LOG_DEBUG, "event: %s\n", __FUNCTION__);
 832         become_session(IO->CitContext);
 833         assert(IO->DNS.Query->PostDNS);
 834         switch (IO->DNS.Query->PostDNS(IO))
 835         {
 836         case eAbort:
 837                 assert(IO->DNS.Fail);
 838                 switch (IO->DNS.Fail(IO)) {
 839                 case eAbort:
 840 ////                    StopClientWatchers(IO);
 841                         ShutDownCLient(IO);
 842                 default:
 843                         break;
 844                 }
 845         default:
 846                 break;
 847         }
 848 }
 849
 850
 851 eNextState EvConnectSock(AsyncIO *IO,
 852                          double conn_timeout,
 853                          double first_rw_timeout,
 854                          int ReadFirst)
 855 {
 856         struct sockaddr_in egress_sin;
 857         int fdflags;
 858         int rc = -1;
 859
 860         become_session(IO->CitContext);
 861
 862         if (ReadFirst) {
 863                 IO->NextState = eReadMessage;
 864         }
 865         else {
 866                 IO->NextState = eSendReply;
 867         }
 868
 869         IO->SendBuf.fd = IO->RecvBuf.fd =
 870                 socket(
 871                         (IO->ConnectMe->IPv6)?PF_INET6:PF_INET,
 872                         SOCK_STREAM,
 873                         IPPROTO_TCP);
 874
 875         if (IO->SendBuf.fd < 0) {
 876                 EV_syslog(LOG_ERR,
 877                           "EVENT: socket() failed: %s\n",
 878                           strerror(errno));
 879
 880                 StrBufPrintf(IO->ErrMsg,
 881                              "Failed to create socket: %s",
 882                              strerror(errno));
 883                 IO->SendBuf.fd = IO->RecvBuf.fd = 0;
 884                 return eAbort;
 885         }
 886         fdflags = fcntl(IO->SendBuf.fd, F_GETFL);
 887         if (fdflags < 0) {
 888                 EV_syslog(LOG_ERR,
 889                           "EVENT: unable to get socket flags! %s \n",
 890                           strerror(errno));
 891                 StrBufPrintf(IO->ErrMsg,
 892                              "Failed to get socket flags: %s",
 893                              strerror(errno));
 894                 close(IO->SendBuf.fd);
 895                 IO->SendBuf.fd = IO->RecvBuf.fd = 0;
 896                 return eAbort;
 897         }
 898         fdflags = fdflags | O_NONBLOCK;
 899         if (fcntl(IO->SendBuf.fd, F_SETFL, fdflags) < 0) {
 900                 EV_syslog(
 901                         LOG_ERR,
 902                         "EVENT: unable to set socket nonblocking flags! %s \n",
 903                         strerror(errno));
 904                 StrBufPrintf(IO->ErrMsg,
 905                              "Failed to set socket flags: %s",
 906                              strerror(errno));
 907                 close(IO->SendBuf.fd);
 908                 IO->SendBuf.fd = IO->RecvBuf.fd = 0;
 909                 return eAbort;
 910         }
 911 /* TODO: maye we could use offsetof() to calc the position of data...
 912  * http://doc.dvgu.ru/devel/ev.html#associating_custom_data_with_a_watcher
 913  */
 914         ev_io_init(&IO->recv_event, IO_recv_callback, IO->RecvBuf.fd, EV_READ);
 915         IO->recv_event.data = IO;
 916         ev_io_init(&IO->send_event, IO_send_callback, IO->SendBuf.fd, EV_WRITE);
 917         IO->send_event.data = IO;
 918
 919         ev_timer_init(&IO->conn_fail, IO_connfail_callback, conn_timeout, 0);
 920         IO->conn_fail.data = IO;
 921         ev_timer_init(&IO->rw_timeout, IO_Timeout_callback, first_rw_timeout,0);
 922         IO->rw_timeout.data = IO;
 923
 924
 925
 926
 927         /* for debugging you may bypass it like this:
 928          * IO->Addr.sin_addr.s_addr = inet_addr("127.0.0.1");
 929          * ((struct sockaddr_in)IO->ConnectMe->Addr).sin_addr.s_addr =
 930          *   inet_addr("127.0.0.1");
 931          */
 932         if (IO->ConnectMe->IPv6) {
 933                 rc = connect(IO->SendBuf.fd,
 934                              &IO->ConnectMe->Addr,
 935                              sizeof(struct sockaddr_in6));
 936         }
 937         else {
 938                 /* If citserver is bound to a specific IP address on the host, make
 939                  * sure we use that address for outbound connections.
 940                  */
 941
 942                 memset(&egress_sin, 0, sizeof(egress_sin));
 943                 egress_sin.sin_family = AF_INET;
 944                 if (!IsEmptyStr(config.c_ip_addr)) {
 945                         egress_sin.sin_addr.s_addr = inet_addr(config.c_ip_addr);
 946                         if (egress_sin.sin_addr.s_addr == !INADDR_ANY) {
 947                                 egress_sin.sin_addr.s_addr = INADDR_ANY;
 948                         }
 949
 950                         /* If this bind fails, no problem; we can still use INADDR_ANY */
 951                         bind(IO->SendBuf.fd, (struct sockaddr *)&egress_sin, sizeof(egress_sin));
 952                 }
 953                 rc = connect(IO->SendBuf.fd,
 954                              (struct sockaddr_in *)&IO->ConnectMe->Addr,
 955                              sizeof(struct sockaddr_in));
 956         }
 957
 958         if (rc >= 0){
 959                 EVM_syslog(LOG_DEBUG, "connect() immediate success.\n");
 960                 set_start_callback(event_base, IO, 0);
 961                 return IO->NextState;
 962         }
 963         else if (errno == EINPROGRESS) {
 964                 EVM_syslog(LOG_DEBUG, "connect() have to wait now.\n");
 965
 966                 ev_io_init(&IO->conn_event,
 967                            IO_connestd_callback,
 968                            IO->SendBuf.fd,
 969                            EV_READ|EV_WRITE);
 970
 971                 IO->conn_event.data = IO;
 972
 973                 ev_io_start(event_base, &IO->conn_event);
 974                 ev_timer_start(event_base, &IO->conn_fail);
 975                 return IO->NextState;
 976         }
 977         else {
 978                 ev_idle_init(&IO->conn_fail_immediate,
 979                              IO_connfailimmediate_callback);
 980                 IO->conn_fail_immediate.data = IO;
 981                 ev_idle_start(event_base, &IO->conn_fail_immediate);
 982
 983                 EV_syslog(LOG_ERR, "connect() failed: %s\n", strerror(errno));
 984                 StrBufPrintf(IO->ErrMsg,
 985                              "Failed to connect: %s",
 986                              strerror(errno));
 987                 return IO->NextState;
 988         }
 989         return IO->NextState;
 990 }
 991
 992 void SetNextTimeout(AsyncIO *IO, double timeout)
 993 {
 994         IO->rw_timeout.repeat = timeout;
 995         ev_timer_again (event_base,  &IO->rw_timeout);
 996 }
 997
 998
 999 eNextState ReAttachIO(AsyncIO *IO,
1000                       void *pData,
1001                       int ReadFirst)
1002 {
1003         IO->Data = pData;
1004         become_session(IO->CitContext);
1005         ev_cleanup_start(event_base, &IO->abort_by_shutdown);
1006         if (ReadFirst) {
1007                 IO->NextState = eReadMessage;
1008         }
1009         else {
1010                 IO->NextState = eSendReply;
1011         }
1012         set_start_callback(event_base, IO, 0);
1013
1014         return IO->NextState;
1015 }
1016
1017 void InitIOStruct(AsyncIO *IO,
1018                   void *Data,
1019                   eNextState NextState,
1020                   IO_LineReaderCallback LineReader,
1021                   IO_CallBack DNS_Fail,
1022                   IO_CallBack SendDone,
1023                   IO_CallBack ReadDone,
1024                   IO_CallBack Terminate,
1025                   IO_CallBack DBTerminate,
1026                   IO_CallBack ConnFail,
1027                   IO_CallBack Timeout,
1028                   IO_CallBack ShutdownAbort)
1029 {
1030         IO->Data          = Data;
1031
1032         IO->CitContext    = CloneContext(CC);
1033         ((CitContext *)IO->CitContext)->session_specific_data = (char*) Data;
1034
1035         IO->NextState     = NextState;
1036
1037         IO->SendDone      = SendDone;
1038         IO->ReadDone      = ReadDone;
1039         IO->Terminate     = Terminate;
1040         IO->DBTerminate   = DBTerminate;
1041         IO->LineReader    = LineReader;
1042         IO->ConnFail      = ConnFail;
1043         IO->Timeout       = Timeout;
1044         IO->ShutdownAbort = ShutdownAbort;
1045
1046         IO->DNS.Fail      = DNS_Fail;
1047
1048         IO->SendBuf.Buf   = NewStrBufPlain(NULL, 1024);
1049         IO->RecvBuf.Buf   = NewStrBufPlain(NULL, 1024);
1050         IO->IOBuf         = NewStrBuf();
1051         EV_syslog(LOG_DEBUG,
1052                   "EVENT: Session lives at %p IO at %p \n",
1053                   Data, IO);
1054
1055 }
1056
1057 extern int evcurl_init(AsyncIO *IO);
1058
1059 int InitcURLIOStruct(AsyncIO *IO,
1060                      void *Data,
1061                      const char* Desc,
1062                      IO_CallBack SendDone,
1063                      IO_CallBack Terminate,
1064                      IO_CallBack DBTerminate,
1065                      IO_CallBack ShutdownAbort)
1066 {
1067         IO->Data          = Data;
1068
1069         IO->CitContext    = CloneContext(CC);
1070         ((CitContext *)IO->CitContext)->session_specific_data = (char*) Data;
1071
1072         IO->SendDone      = SendDone;
1073         IO->Terminate     = Terminate;
1074         IO->DBTerminate   = DBTerminate;
1075         IO->ShutdownAbort = ShutdownAbort;
1076
1077         strcpy(IO->HttpReq.errdesc, Desc);
1078
1079
1080         return  evcurl_init(IO);
1081
1082 }
1083
1084 extern int DebugEventLoopBacktrace;
1085 void EV_backtrace(AsyncIO *IO)
1086 {
1087 #ifdef HAVE_BACKTRACE
1088         void *stack_frames[50];
1089         size_t size, i;
1090         char **strings;
1091
1092         if ((IO == NULL) || (DebugEventLoopBacktrace == 0))
1093                 return;
1094         size = backtrace(stack_frames, sizeof(stack_frames) / sizeof(void*));
1095         strings = backtrace_symbols(stack_frames, size);
1096         for (i = 0; i < size; i++) {
1097                 if (strings != NULL) {
1098                         EV_syslog(LOG_ALERT, " BT %s\n", strings[i]);
1099                 }
1100                 else {
1101                         EV_syslog(LOG_ALERT, " BT %p\n", stack_frames[i]);
1102                 }
1103         }
1104         free(strings);
1105 #endif
1106 }
1107
1108
1109 ev_tstamp ctdl_ev_now (void)
1110 {
1111         return ev_now(event_base);
1112 }