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                 IO->CitContext = NULL;
 302         }
 303 }
 304
 305
 306 void StopClientWatchers(AsyncIO *IO, int CloseFD)
 307 {
 308         ev_timer_stop (event_base, &IO->rw_timeout);
 309         ev_timer_stop(event_base, &IO->conn_fail);
 310         ev_idle_stop(event_base, &IO->unwind_stack);
 311         ev_cleanup_stop(event_base, &IO->abort_by_shutdown);
 312
 313         ev_io_stop(event_base, &IO->conn_event);
 314         ev_io_stop(event_base, &IO->send_event);
 315         ev_io_stop(event_base, &IO->recv_event);
 316
 317         if (CloseFD && (IO->SendBuf.fd > 0)) {
 318                 close(IO->SendBuf.fd);
 319                 IO->SendBuf.fd = 0;
 320                 IO->RecvBuf.fd = 0;
 321         }
 322 }
 323
 324 void StopCurlWatchers(AsyncIO *IO)
 325 {
 326         ev_timer_stop (event_base, &IO->rw_timeout);
 327         ev_timer_stop(event_base, &IO->conn_fail);
 328         ev_idle_stop(event_base, &IO->unwind_stack);
 329         ev_cleanup_stop(event_base, &IO->abort_by_shutdown);
 330
 331         ev_io_stop(event_base, &IO->conn_event);
 332         ev_io_stop(event_base, &IO->send_event);
 333         ev_io_stop(event_base, &IO->recv_event);
 334
 335         if (IO->SendBuf.fd != 0) {
 336                 close(IO->SendBuf.fd);
 337         }
 338         IO->SendBuf.fd = 0;
 339         IO->RecvBuf.fd = 0;
 340 }
 341
 342 void ShutDownCLient(AsyncIO *IO)
 343 {
 344         CitContext *Ctx =IO->CitContext;
 345         become_session(Ctx);
 346
 347         EVM_syslog(LOG_DEBUG, "EVENT Terminating \n");
 348
 349         StopClientWatchers(IO, 1);
 350
 351         if (IO->DNS.Channel != NULL) {
 352                 ares_destroy(IO->DNS.Channel);
 353                 EV_DNS_LOG_STOP(DNS.recv_event);
 354                 EV_DNS_LOG_STOP(DNS.send_event);
 355                 ev_io_stop(event_base, &IO->DNS.recv_event);
 356                 ev_io_stop(event_base, &IO->DNS.send_event);
 357                 IO->DNS.Channel = NULL;
 358         }
 359         assert(IO->Terminate);
 360         IO->Terminate(IO);
 361 }
 362
 363 void PostInbound(AsyncIO *IO)
 364 {
 365         switch (IO->NextState) {
 366         case eSendFile:
 367                 ev_io_start(event_base, &IO->send_event);
 368                 break;
 369         case eSendReply:
 370         case eSendMore:
 371                 assert(IO->SendDone);
 372                 IO->NextState = IO->SendDone(IO);
 373                 ev_io_start(event_base, &IO->send_event);
 374                 break;
 375         case eReadPayload:
 376         case eReadMore:
 377         case eReadFile:
 378                 ev_io_start(event_base, &IO->recv_event);
 379                 break;
 380         case eTerminateConnection:
 381                 ShutDownCLient(IO);
 382                 break;
 383         case eAbort:
 384                 ShutDownCLient(IO);
 385                 break;
 386         case eSendDNSQuery:
 387         case eReadDNSReply:
 388         case eDBQuery:
 389         case eConnect:
 390         case eReadMessage:
 391                 break;
 392         }
 393 }
 394 eReadState HandleInbound(AsyncIO *IO)
 395 {
 396         const char *Err = NULL;
 397         eReadState Finished = eBufferNotEmpty;
 398
 399         become_session(IO->CitContext);
 400
 401         while ((Finished == eBufferNotEmpty) &&
 402                ((IO->NextState == eReadMessage)||
 403                 (IO->NextState == eReadMore)||
 404                 (IO->NextState == eReadFile)||
 405                 (IO->NextState == eReadPayload)))
 406         {
 407                 /* Reading lines...
 408                  * lex line reply in callback,
 409                  * or do it ourselves.
 410                  * i.e. as nnn-blabla means continue reading in SMTP
 411                  */
 412                 if ((IO->NextState == eReadFile) &&
 413                     (Finished == eBufferNotEmpty))
 414                 {
 415                         Finished = WriteIOBAlreadyRead(&IO->IOB, &Err);
 416                         if (Finished == eReadSuccess)
 417                         {
 418                                 IO->NextState = eSendReply;
 419                         }
 420                 }
 421                 else if (IO->LineReader)
 422                         Finished = IO->LineReader(IO);
 423                 else
 424                         Finished = StrBufChunkSipLine(IO->IOBuf,
 425                                                       &IO->RecvBuf);
 426
 427                 switch (Finished) {
 428                 case eMustReadMore: /// read new from socket...
 429                         break;
 430                 case eBufferNotEmpty: /* shouldn't happen... */
 431                 case eReadSuccess: /// done for now...
 432                         break;
 433                 case eReadFail: /// WHUT?
 434                                 ///todo: shut down!
 435                         break;
 436                 }
 437
 438                 if (Finished != eMustReadMore) {
 439                         assert(IO->ReadDone);
 440                         ev_io_stop(event_base, &IO->recv_event);
 441                         IO->NextState = IO->ReadDone(IO);
 442                         Finished = StrBufCheckBuffer(&IO->RecvBuf);
 443                 }
 444         }
 445
 446         PostInbound(IO);
 447
 448         return Finished;
 449 }
 450
 451
 452 static void
 453 IO_send_callback(struct ev_loop *loop, ev_io *watcher, int revents)
 454 {
 455         int rc;
 456         AsyncIO *IO = watcher->data;
 457         const char *errmsg = NULL;
 458
 459         IO->Now = ev_now(event_base);
 460         become_session(IO->CitContext);
 461 #ifdef BIGBAD_IODBG
 462         {
 463                 int rv = 0;
 464                 char fn [SIZ];
 465                 FILE *fd;
 466                 const char *pch = ChrPtr(IO->SendBuf.Buf);
 467                 const char *pchh = IO->SendBuf.ReadWritePointer;
 468                 long nbytes;
 469
 470                 if (pchh == NULL)
 471                         pchh = pch;
 472
 473                 nbytes = StrLength(IO->SendBuf.Buf) - (pchh - pch);
 474                 snprintf(fn, SIZ, "/tmp/foolog_ev_%s.%d",
 475                          ((CitContext*)(IO->CitContext))->ServiceName,
 476                          IO->SendBuf.fd);
 477
 478                 fd = fopen(fn, "a+");
 479                 fprintf(fd, "Send: BufSize: %ld BufContent: [",
 480                         nbytes);
 481                 rv = fwrite(pchh, nbytes, 1, fd);
 482                 if (!rv) printf("failed to write debug to %s!\n", fn);
 483                 fprintf(fd, "]\n");
 484 #endif
 485                 switch (IO->NextState) {
 486                 case eSendFile:
 487                         rc = FileSendChunked(&IO->IOB, &errmsg);
 488                         if (rc < 0)
 489                                 StrBufPlain(IO->ErrMsg, errmsg, -1);
 490                         break;
 491                 default:
 492                         rc = StrBuf_write_one_chunk_callback(IO->SendBuf.fd,
 493                                                              0,
 494                                                              &IO->SendBuf);
 495                 }
 496
 497 #ifdef BIGBAD_IODBG
 498                 fprintf(fd, "Sent: BufSize: %d bytes.\n", rc);
 499                 fclose(fd);
 500         }
 501 #endif
 502         if (rc == 0)
 503         {
 504                 ev_io_stop(event_base, &IO->send_event);
 505                 switch (IO->NextState) {
 506                 case eSendMore:
 507                         assert(IO->SendDone);
 508                         IO->NextState = IO->SendDone(IO);
 509
 510                         if ((IO->NextState == eTerminateConnection) ||
 511                             (IO->NextState == eAbort) )
 512                                 ShutDownCLient(IO);
 513                         else {
 514                                 ev_io_start(event_base, &IO->send_event);
 515                         }
 516                         break;
 517                 case eSendFile:
 518                         if (IO->IOB.ChunkSendRemain > 0) {
 519                                 ev_io_start(event_base, &IO->recv_event);
 520                                 SetNextTimeout(IO, 100.0);
 521
 522                         } else {
 523                                 assert(IO->ReadDone);
 524                                 IO->NextState = IO->ReadDone(IO);
 525                                 switch(IO->NextState) {
 526                                 case eSendDNSQuery:
 527                                 case eReadDNSReply:
 528                                 case eDBQuery:
 529                                 case eConnect:
 530                                         break;
 531                                 case eSendReply:
 532                                 case eSendMore:
 533                                 case eSendFile:
 534                                         ev_io_start(event_base,
 535                                                     &IO->send_event);
 536                                         break;
 537                                 case eReadMessage:
 538                                 case eReadMore:
 539                                 case eReadPayload:
 540                                 case eReadFile:
 541                                         break;
 542                                 case eTerminateConnection:
 543                                 case eAbort:
 544                                         break;
 545                                 }
 546                         }
 547                         break;
 548                 case eSendReply:
 549                     if (StrBufCheckBuffer(&IO->SendBuf) != eReadSuccess)
 550                         break;
 551                     IO->NextState = eReadMore;
 552                 case eReadMore:
 553                 case eReadMessage:
 554                 case eReadPayload:
 555                 case eReadFile:
 556                         if (StrBufCheckBuffer(&IO->RecvBuf) == eBufferNotEmpty)
 557                         {
 558                                 HandleInbound(IO);
 559                         }
 560                         else {
 561                                 ev_io_start(event_base, &IO->recv_event);
 562                         }
 563
 564                         break;
 565                 case eDBQuery:
 566                         /*
 567                          * we now live in another queue,
 568                          * so we have to unregister.
 569                          */
 570                         ev_cleanup_stop(loop, &IO->abort_by_shutdown);
 571                         break;
 572                 case eSendDNSQuery:
 573                 case eReadDNSReply:
 574                 case eConnect:
 575                 case eTerminateConnection:
 576                 case eAbort:
 577                         break;
 578                 }
 579         }
 580         else if (rc < 0) {
 581                 if (errno != EAGAIN) {
 582                         StopClientWatchers(IO, 1);
 583                         EV_syslog(LOG_DEBUG,
 584                                   "IO_send_callback(): Socket Invalid! [%d] [%s] [%d]\n",
 585                                   errno, strerror(errno), IO->SendBuf.fd);
 586                         StrBufPrintf(IO->ErrMsg,
 587                                      "Socket Invalid! [%s]",
 588                                      strerror(errno));
 589                         SetNextTimeout(IO, 0.01);
 590                 }
 591         }
 592         /* else : must write more. */
 593 }
 594 static void
 595 set_start_callback(struct ev_loop *loop, AsyncIO *IO, int revents)
 596 {
 597         ev_timer_stop(event_base, &IO->conn_fail);
 598         ev_timer_start(event_base, &IO->rw_timeout);
 599
 600         switch(IO->NextState) {
 601         case eReadMore:
 602         case eReadMessage:
 603         case eReadFile:
 604                 StrBufAppendBufPlain(IO->ErrMsg, HKEY("[while waiting for greeting]"), 0);
 605                 ev_io_start(event_base, &IO->recv_event);
 606                 break;
 607         case eSendReply:
 608         case eSendMore:
 609         case eReadPayload:
 610         case eSendFile:
 611                 become_session(IO->CitContext);
 612                 IO_send_callback(loop, &IO->send_event, revents);
 613                 break;
 614         case eDBQuery:
 615         case eSendDNSQuery:
 616         case eReadDNSReply:
 617         case eConnect:
 618         case eTerminateConnection:
 619         case eAbort:
 620                 /// TODO: WHUT?
 621                 break;
 622         }
 623 }
 624
 625 static void
 626 IO_Timeout_callback(struct ev_loop *loop, ev_timer *watcher, int revents)
 627 {
 628         AsyncIO *IO = watcher->data;
 629
 630         IO->Now = ev_now(event_base);
 631         ev_timer_stop (event_base, &IO->rw_timeout);
 632         become_session(IO->CitContext);
 633
 634         if (IO->SendBuf.fd != 0)
 635         {
 636                 ev_io_stop(event_base, &IO->send_event);
 637                 ev_io_stop(event_base, &IO->recv_event);
 638                 ev_timer_stop (event_base, &IO->rw_timeout);
 639                 close(IO->SendBuf.fd);
 640                 IO->SendBuf.fd = IO->RecvBuf.fd = 0;
 641         }
 642
 643         assert(IO->Timeout);
 644         switch (IO->Timeout(IO))
 645         {
 646         case eAbort:
 647                 ShutDownCLient(IO);
 648         default:
 649                 break;
 650         }
 651 }
 652
 653 static void
 654 IO_connfail_callback(struct ev_loop *loop, ev_timer *watcher, int revents)
 655 {
 656         AsyncIO *IO = watcher->data;
 657
 658         IO->Now = ev_now(event_base);
 659         ev_timer_stop (event_base, &IO->conn_fail);
 660
 661         if (IO->SendBuf.fd != 0)
 662         {
 663                 ev_io_stop(loop, &IO->conn_event);
 664                 ev_io_stop(event_base, &IO->send_event);
 665                 ev_io_stop(event_base, &IO->recv_event);
 666                 ev_timer_stop (event_base, &IO->rw_timeout);
 667                 close(IO->SendBuf.fd);
 668                 IO->SendBuf.fd = IO->RecvBuf.fd = 0;
 669         }
 670         become_session(IO->CitContext);
 671
 672         assert(IO->ConnFail);
 673         switch (IO->ConnFail(IO))
 674         {
 675         case eAbort:
 676                 ShutDownCLient(IO);
 677         default:
 678                 break;
 679
 680         }
 681 }
 682
 683 static void
 684 IO_connfailimmediate_callback(struct ev_loop *loop,
 685                               ev_idle *watcher,
 686                               int revents)
 687 {
 688         AsyncIO *IO = watcher->data;
 689
 690         IO->Now = ev_now(event_base);
 691         ev_idle_stop (event_base, &IO->conn_fail_immediate);
 692
 693         if (IO->SendBuf.fd != 0)
 694         {
 695                 close(IO->SendBuf.fd);
 696                 IO->SendBuf.fd = IO->RecvBuf.fd = 0;
 697         }
 698         become_session(IO->CitContext);
 699
 700         assert(IO->ConnFail);
 701         switch (IO->ConnFail(IO))
 702         {
 703         case eAbort:
 704                 ShutDownCLient(IO);
 705         default:
 706                 break;
 707
 708         }
 709 }
 710
 711 static void
 712 IO_connestd_callback(struct ev_loop *loop, ev_io *watcher, int revents)
 713 {
 714         AsyncIO *IO = watcher->data;
 715         int             so_err = 0;
 716         socklen_t       lon = sizeof(so_err);
 717         int             err;
 718
 719         IO->Now = ev_now(event_base);
 720         EVM_syslog(LOG_DEBUG, "connect() succeeded.\n");
 721
 722         ev_io_stop(loop, &IO->conn_event);
 723         ev_timer_stop(event_base, &IO->conn_fail);
 724
 725         err = getsockopt(IO->SendBuf.fd,
 726                          SOL_SOCKET,
 727                          SO_ERROR,
 728                          (void*)&so_err,
 729                          &lon);
 730
 731         if ((err == 0) && (so_err != 0))
 732         {
 733                 EV_syslog(LOG_DEBUG, "connect() failed [%d][%s]\n",
 734                           so_err,
 735                           strerror(so_err));
 736                 IO_connfail_callback(loop, &IO->conn_fail, revents);
 737
 738         }
 739         else
 740         {
 741                 EVM_syslog(LOG_DEBUG, "connect() succeeded\n");
 742                 set_start_callback(loop, IO, revents);
 743         }
 744 }
 745
 746 static void
 747 IO_recv_callback(struct ev_loop *loop, ev_io *watcher, int revents)
 748 {
 749         const char *errmsg;
 750         ssize_t nbytes;
 751         AsyncIO *IO = watcher->data;
 752
 753         IO->Now = ev_now(event_base);
 754         switch (IO->NextState) {
 755         case eReadFile:
 756                 nbytes = FileRecvChunked(&IO->IOB, &errmsg);
 757                 if (nbytes < 0)
 758                         StrBufPlain(IO->ErrMsg, errmsg, -1);
 759                 else
 760                 {
 761                         if (IO->IOB.ChunkSendRemain == 0)
 762                         {
 763                                 IO->NextState = eSendReply;
 764                                 assert(IO->ReadDone);
 765                                 ev_io_stop(event_base, &IO->recv_event);
 766                                 PostInbound(IO);
 767                                 return;
 768                         }
 769                         else
 770                                 return;
 771                 }
 772                 break;
 773         default:
 774                 nbytes = StrBuf_read_one_chunk_callback(IO->RecvBuf.fd,
 775                                                         0,
 776                                                         &IO->RecvBuf);
 777                 break;
 778         }
 779
 780 #ifdef BIGBAD_IODBG
 781         {
 782                 long nbytes;
 783                 int rv = 0;
 784                 char fn [SIZ];
 785                 FILE *fd;
 786                 const char *pch = ChrPtr(IO->RecvBuf.Buf);
 787                 const char *pchh = IO->RecvBuf.ReadWritePointer;
 788
 789                 if (pchh == NULL)
 790                         pchh = pch;
 791
 792                 nbytes = StrLength(IO->RecvBuf.Buf) - (pchh - pch);
 793                 snprintf(fn, SIZ, "/tmp/foolog_ev_%s.%d",
 794                          ((CitContext*)(IO->CitContext))->ServiceName,
 795                          IO->SendBuf.fd);
 796
 797                 fd = fopen(fn, "a+");
 798                 fprintf(fd, "Read: BufSize: %ld BufContent: [",
 799                         nbytes);
 800                 rv = fwrite(pchh, nbytes, 1, fd);
 801                 if (!rv) printf("failed to write debug to %s!\n", fn);
 802                 fprintf(fd, "]\n");
 803                 fclose(fd);
 804         }
 805 #endif
 806         if (nbytes > 0) {
 807                 HandleInbound(IO);
 808         } else if (nbytes == 0) {
 809                 StopClientWatchers(IO, 1);
 810                 SetNextTimeout(IO, 0.01);
 811                 return;
 812         } else if (nbytes == -1) {
 813                 if (errno != EAGAIN) {
 814                         // FD is gone. kick it.
 815                         StopClientWatchers(IO, 1);
 816                         EV_syslog(LOG_DEBUG,
 817                                   "IO_recv_callback(): Socket Invalid! [%d] [%s] [%d]\n",
 818                                   errno, strerror(errno), IO->SendBuf.fd);
 819                         StrBufPrintf(IO->ErrMsg,
 820                                      "Socket Invalid! [%s]",
 821                                      strerror(errno));
 822                         SetNextTimeout(IO, 0.01);
 823                 }
 824                 return;
 825         }
 826 }
 827
 828 void
 829 IO_postdns_callback(struct ev_loop *loop, ev_idle *watcher, int revents)
 830 {
 831         AsyncIO *IO = watcher->data;
 832         IO->Now = ev_now(event_base);
 833         EV_syslog(LOG_DEBUG, "event: %s\n", __FUNCTION__);
 834         become_session(IO->CitContext);
 835         assert(IO->DNS.Query->PostDNS);
 836         switch (IO->DNS.Query->PostDNS(IO))
 837         {
 838         case eAbort:
 839                 assert(IO->DNS.Fail);
 840                 switch (IO->DNS.Fail(IO)) {
 841                 case eAbort:
 842 ////                    StopClientWatchers(IO);
 843                         ShutDownCLient(IO);
 844                 default:
 845                         break;
 846                 }
 847         default:
 848                 break;
 849         }
 850 }
 851
 852
 853 eNextState EvConnectSock(AsyncIO *IO,
 854                          double conn_timeout,
 855                          double first_rw_timeout,
 856                          int ReadFirst)
 857 {
 858         struct sockaddr_in egress_sin;
 859         int fdflags;
 860         int rc = -1;
 861
 862         become_session(IO->CitContext);
 863
 864         if (ReadFirst) {
 865                 IO->NextState = eReadMessage;
 866         }
 867         else {
 868                 IO->NextState = eSendReply;
 869         }
 870
 871         IO->SendBuf.fd = IO->RecvBuf.fd =
 872                 socket(
 873                         (IO->ConnectMe->IPv6)?PF_INET6:PF_INET,
 874                         SOCK_STREAM,
 875                         IPPROTO_TCP);
 876
 877         if (IO->SendBuf.fd < 0) {
 878                 EV_syslog(LOG_ERR,
 879                           "EVENT: socket() failed: %s\n",
 880                           strerror(errno));
 881
 882                 StrBufPrintf(IO->ErrMsg,
 883                              "Failed to create socket: %s",
 884                              strerror(errno));
 885                 IO->SendBuf.fd = IO->RecvBuf.fd = 0;
 886                 return eAbort;
 887         }
 888         fdflags = fcntl(IO->SendBuf.fd, F_GETFL);
 889         if (fdflags < 0) {
 890                 EV_syslog(LOG_ERR,
 891                           "EVENT: unable to get socket %d flags! %s \n",
 892                           IO->SendBuf.fd,
 893                           strerror(errno));
 894                 StrBufPrintf(IO->ErrMsg,
 895                              "Failed to get socket %d flags: %s",
 896                              IO->SendBuf.fd,
 897                              strerror(errno));
 898                 close(IO->SendBuf.fd);
 899                 IO->SendBuf.fd = IO->RecvBuf.fd = 0;
 900                 return eAbort;
 901         }
 902         fdflags = fdflags | O_NONBLOCK;
 903         if (fcntl(IO->SendBuf.fd, F_SETFL, fdflags) < 0) {
 904                 EV_syslog(
 905                         LOG_ERR,
 906                         "EVENT: unable to set socket %d nonblocking flags! %s \n",
 907                         IO->SendBuf.fd,
 908                         strerror(errno));
 909                 StrBufPrintf(IO->ErrMsg,
 910                              "Failed to set socket flags: %s",
 911                              strerror(errno));
 912                 close(IO->SendBuf.fd);
 913                 IO->SendBuf.fd = IO->RecvBuf.fd = 0;
 914                 return eAbort;
 915         }
 916 /* TODO: maye we could use offsetof() to calc the position of data...
 917  * http://doc.dvgu.ru/devel/ev.html#associating_custom_data_with_a_watcher
 918  */
 919         ev_io_init(&IO->recv_event, IO_recv_callback, IO->RecvBuf.fd, EV_READ);
 920         IO->recv_event.data = IO;
 921         ev_io_init(&IO->send_event, IO_send_callback, IO->SendBuf.fd, EV_WRITE);
 922         IO->send_event.data = IO;
 923
 924         ev_timer_init(&IO->conn_fail, IO_connfail_callback, conn_timeout, 0);
 925         IO->conn_fail.data = IO;
 926         ev_timer_init(&IO->rw_timeout, IO_Timeout_callback, first_rw_timeout,0);
 927         IO->rw_timeout.data = IO;
 928
 929
 930
 931
 932         /* for debugging you may bypass it like this:
 933          * IO->Addr.sin_addr.s_addr = inet_addr("127.0.0.1");
 934          * ((struct sockaddr_in)IO->ConnectMe->Addr).sin_addr.s_addr =
 935          *   inet_addr("127.0.0.1");
 936          */
 937         if (IO->ConnectMe->IPv6) {
 938                 rc = connect(IO->SendBuf.fd,
 939                              &IO->ConnectMe->Addr,
 940                              sizeof(struct sockaddr_in6));
 941         }
 942         else {
 943                 /* If citserver is bound to a specific IP address on the host, make
 944                  * sure we use that address for outbound connections.
 945                  */
 946
 947                 memset(&egress_sin, 0, sizeof(egress_sin));
 948                 egress_sin.sin_family = AF_INET;
 949                 if (!IsEmptyStr(config.c_ip_addr)) {
 950                         egress_sin.sin_addr.s_addr = inet_addr(config.c_ip_addr);
 951                         if (egress_sin.sin_addr.s_addr == !INADDR_ANY) {
 952                                 egress_sin.sin_addr.s_addr = INADDR_ANY;
 953                         }
 954
 955                         /* If this bind fails, no problem; we can still use INADDR_ANY */
 956                         bind(IO->SendBuf.fd, (struct sockaddr *)&egress_sin, sizeof(egress_sin));
 957                 }
 958                 rc = connect(IO->SendBuf.fd,
 959                              (struct sockaddr_in *)&IO->ConnectMe->Addr,
 960                              sizeof(struct sockaddr_in));
 961         }
 962
 963         if (rc >= 0){
 964                 EV_syslog(LOG_DEBUG, "connect() = %d immediate success.\n", IO->SendBuf.fd);
 965                 set_start_callback(event_base, IO, 0);
 966                 return IO->NextState;
 967         }
 968         else if (errno == EINPROGRESS) {
 969                 EV_syslog(LOG_DEBUG, "connect() = %d have to wait now.\n", IO->SendBuf.fd);
 970
 971                 ev_io_init(&IO->conn_event,
 972                            IO_connestd_callback,
 973                            IO->SendBuf.fd,
 974                            EV_READ|EV_WRITE);
 975
 976                 IO->conn_event.data = IO;
 977
 978                 ev_io_start(event_base, &IO->conn_event);
 979                 ev_timer_start(event_base, &IO->conn_fail);
 980                 return IO->NextState;
 981         }
 982         else {
 983                 ev_idle_init(&IO->conn_fail_immediate,
 984                              IO_connfailimmediate_callback);
 985                 IO->conn_fail_immediate.data = IO;
 986                 ev_idle_start(event_base, &IO->conn_fail_immediate);
 987
 988                 EV_syslog(LOG_ERR,
 989                           "connect() = %d failed: %s\n",
 990                           IO->SendBuf.fd,
 991                           strerror(errno));
 992
 993                 StrBufPrintf(IO->ErrMsg,
 994                              "Failed to connect: %s",
 995                              strerror(errno));
 996                 return IO->NextState;
 997         }
 998         return IO->NextState;
 999 }
1000
1001 void SetNextTimeout(AsyncIO *IO, double timeout)
1002 {
1003         IO->rw_timeout.repeat = timeout;
1004         ev_timer_again (event_base,  &IO->rw_timeout);
1005 }
1006
1007
1008 eNextState ReAttachIO(AsyncIO *IO,
1009                       void *pData,
1010                       int ReadFirst)
1011 {
1012         IO->Data = pData;
1013         become_session(IO->CitContext);
1014         ev_cleanup_start(event_base, &IO->abort_by_shutdown);
1015         if (ReadFirst) {
1016                 IO->NextState = eReadMessage;
1017         }
1018         else {
1019                 IO->NextState = eSendReply;
1020         }
1021         set_start_callback(event_base, IO, 0);
1022
1023         return IO->NextState;
1024 }
1025
1026 void InitIOStruct(AsyncIO *IO,
1027                   void *Data,
1028                   eNextState NextState,
1029                   IO_LineReaderCallback LineReader,
1030                   IO_CallBack DNS_Fail,
1031                   IO_CallBack SendDone,
1032                   IO_CallBack ReadDone,
1033                   IO_CallBack Terminate,
1034                   IO_CallBack DBTerminate,
1035                   IO_CallBack ConnFail,
1036                   IO_CallBack Timeout,
1037                   IO_CallBack ShutdownAbort)
1038 {
1039         IO->Data          = Data;
1040
1041         IO->CitContext    = CloneContext(CC);
1042         IO->CitContext->session_specific_data = Data;
1043         IO->CitContext->IO = IO;
1044
1045         IO->NextState     = NextState;
1046
1047         IO->SendDone      = SendDone;
1048         IO->ReadDone      = ReadDone;
1049         IO->Terminate     = Terminate;
1050         IO->DBTerminate   = DBTerminate;
1051         IO->LineReader    = LineReader;
1052         IO->ConnFail      = ConnFail;
1053         IO->Timeout       = Timeout;
1054         IO->ShutdownAbort = ShutdownAbort;
1055
1056         IO->DNS.Fail      = DNS_Fail;
1057
1058         IO->SendBuf.Buf   = NewStrBufPlain(NULL, 1024);
1059         IO->RecvBuf.Buf   = NewStrBufPlain(NULL, 1024);
1060         IO->IOBuf         = NewStrBuf();
1061         EV_syslog(LOG_DEBUG,
1062                   "EVENT: Session lives at %p IO at %p \n",
1063                   Data, IO);
1064
1065 }
1066
1067 extern int evcurl_init(AsyncIO *IO);
1068
1069 int InitcURLIOStruct(AsyncIO *IO,
1070                      void *Data,
1071                      const char* Desc,
1072                      IO_CallBack SendDone,
1073                      IO_CallBack Terminate,
1074                      IO_CallBack DBTerminate,
1075                      IO_CallBack ShutdownAbort)
1076 {
1077         IO->Data          = Data;
1078
1079         IO->CitContext    = CloneContext(CC);
1080         IO->CitContext->session_specific_data = Data;
1081         IO->CitContext->IO = IO;
1082
1083         IO->SendDone      = SendDone;
1084         IO->Terminate     = Terminate;
1085         IO->DBTerminate   = DBTerminate;
1086         IO->ShutdownAbort = ShutdownAbort;
1087
1088         strcpy(IO->HttpReq.errdesc, Desc);
1089
1090
1091         return  evcurl_init(IO);
1092
1093 }
1094
1095
1096 typedef struct KillOtherSessionContext {
1097         AsyncIO IO;
1098         AsyncIO *OtherOne;
1099 }KillOtherSessionContext;
1100
1101 eNextState KillTerminate(AsyncIO *IO)
1102 {
1103         KillOtherSessionContext *Ctx = (KillOtherSessionContext*)IO->Data;
1104         EV_syslog(LOG_DEBUG, "%s Exit\n", __FUNCTION__);
1105         FreeAsyncIOContents(IO);
1106         memset(Ctx, 0, sizeof(KillOtherSessionContext));
1107         free(Ctx);
1108         return eAbort;
1109
1110 }
1111
1112 eNextState KillShutdown(AsyncIO *IO)
1113 {
1114         return eTerminateConnection;
1115 }
1116
1117 eNextState KillOtherContextNow(AsyncIO *IO)
1118 {
1119         KillOtherSessionContext *Ctx = IO->Data;
1120
1121         if (Ctx->OtherOne->ShutdownAbort != NULL)
1122                 Ctx->OtherOne->ShutdownAbort(Ctx->OtherOne);
1123         return eTerminateConnection;
1124 }
1125
1126 void KillAsyncIOContext(AsyncIO *IO)
1127 {
1128         KillOtherSessionContext *Ctx;
1129
1130         Ctx = (KillOtherSessionContext*) malloc(sizeof(KillOtherSessionContext));
1131         memset(Ctx, 0, sizeof(KillOtherSessionContext));
1132
1133         InitIOStruct(&Ctx->IO,
1134                      Ctx,
1135                      eReadMessage,
1136                      NULL,
1137                      NULL,
1138                      NULL,
1139                      NULL,
1140                      KillTerminate,
1141                      NULL,
1142                      NULL,
1143                      NULL,
1144                      KillShutdown);
1145
1146         Ctx->OtherOne = IO;
1147
1148         switch(IO->NextState) {
1149         case eSendDNSQuery:
1150         case eReadDNSReply:
1151
1152         case eConnect:
1153         case eSendReply:
1154         case eSendMore:
1155         case eSendFile:
1156
1157         case eReadMessage:
1158         case eReadMore:
1159         case eReadPayload:
1160         case eReadFile:
1161                 QueueEventContext(&Ctx->IO, KillOtherContextNow);
1162                 break;
1163         case eDBQuery:
1164                 QueueDBOperation(&Ctx->IO, KillOtherContextNow);
1165                 break;
1166         case eTerminateConnection:
1167         case eAbort:
1168                 /*hm, its already dying, dunno which Queue its in... */
1169                 free(Ctx);
1170         }
1171
1172 }
1173
1174 extern int DebugEventLoopBacktrace;
1175 void EV_backtrace(AsyncIO *IO)
1176 {
1177 #ifdef HAVE_BACKTRACE
1178         void *stack_frames[50];
1179         size_t size, i;
1180         char **strings;
1181
1182         if ((IO == NULL) || (DebugEventLoopBacktrace == 0))
1183                 return;
1184         size = backtrace(stack_frames, sizeof(stack_frames) / sizeof(void*));
1185         strings = backtrace_symbols(stack_frames, size);
1186         for (i = 0; i < size; i++) {
1187                 if (strings != NULL) {
1188                         EV_syslog(LOG_ALERT, " BT %s\n", strings[i]);
1189                 }
1190                 else {
1191                         EV_syslog(LOG_ALERT, " BT %p\n", stack_frames[i]);
1192                 }
1193         }
1194         free(strings);
1195 #endif
1196 }
1197
1198
1199 ev_tstamp ctdl_ev_now (void)
1200 {
1201         return ev_now(event_base);
1202 }