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
  68 ConstStr IOStates[] = {
  69         {HKEY("DB Queue")},
  70         {HKEY("DB Q Next")},
  71         {HKEY("DB Attach")},
  72         {HKEY("DB Next")},
  73         {HKEY("DB Stop")},
  74         {HKEY("DB Exit")},
  75         {HKEY("DB Terminate")},
  76         {HKEY("IO Queue")},
  77         {HKEY("IO Attach")},
  78         {HKEY("IO Connect Socket")},
  79         {HKEY("IO Abort")},
  80         {HKEY("IO Timeout")},
  81         {HKEY("IO ConnFail")},
  82         {HKEY("IO ConnFail Now")},
  83         {HKEY("IO Conn Now")},
  84         {HKEY("IO Conn Wait")},
  85         {HKEY("Curl Q")},
  86         {HKEY("Curl Start")},
  87         {HKEY("Curl Shotdown")},
  88         {HKEY("Curl More IO")},
  89         {HKEY("Curl Got IO")},
  90         {HKEY("Curl Got Data")},
  91         {HKEY("Curl Got Status")},
  92         {HKEY("C-Ares Start")},
  93         {HKEY("C-Ares IO Done")},
  94         {HKEY("C-Ares Finished")},
  95         {HKEY("C-Ares exit")},
  96         {HKEY("Killing")},
  97         {HKEY("Exit")}
  98 };
  99
 100 void SetEVState(AsyncIO *IO, eIOState State)
 101 {
 102
 103         CitContext* CCC = IO->CitContext;
 104         if (CCC != NULL)
 105                 memcpy(CCC->lastcmdname, IOStates[State].Key, IOStates[State].len + 1);
 106
 107 }
 108
 109
 110 static void IO_Timeout_callback(struct ev_loop *loop, ev_timer *watcher, int revents);
 111 static void IO_abort_shutdown_callback(struct ev_loop *loop,
 112                                        ev_cleanup *watcher,
 113                                        int revents);
 114
 115
 116 /*------------------------------------------------------------------------------
 117  *                              Server DB IO
 118  *----------------------------------------------------------------------------*/
 119 extern int evdb_count;
 120 extern pthread_mutex_t DBEventQueueMutex;
 121 extern pthread_mutex_t DBEventExitQueueMutex;
 122 extern HashList *DBInboundEventQueue;
 123 extern struct ev_loop *event_db;
 124 extern ev_async DBAddJob;
 125 extern ev_async DBExitEventLoop;
 126
 127 eNextState QueueDBOperation(AsyncIO *IO, IO_CallBack CB)
 128 {
 129         IOAddHandler *h;
 130         int i;
 131
 132         SetEVState(IO, eDBQ);
 133         h = (IOAddHandler*)malloc(sizeof(IOAddHandler));
 134         h->IO = IO;
 135         h->EvAttch = CB;
 136         ev_cleanup_init(&IO->db_abort_by_shutdown,
 137                         IO_abort_shutdown_callback);
 138         IO->db_abort_by_shutdown.data = IO;
 139
 140         pthread_mutex_lock(&DBEventQueueMutex);
 141         if (DBInboundEventQueue == NULL)
 142         {
 143                 /* shutting down... */
 144                 free(h);
 145                 EVM_syslog(LOG_DEBUG, "DBEVENT Q exiting.\n");
 146                 pthread_mutex_unlock(&DBEventQueueMutex);
 147                 return eAbort;
 148         }
 149         EVM_syslog(LOG_DEBUG, "DBEVENT Q\n");
 150         i = ++evdb_count ;
 151         Put(DBInboundEventQueue, IKEY(i), h, NULL);
 152         pthread_mutex_unlock(&DBEventQueueMutex);
 153
 154         pthread_mutex_lock(&DBEventExitQueueMutex);
 155         if (event_db == NULL)
 156         {
 157                 pthread_mutex_unlock(&DBEventExitQueueMutex);
 158                 return eAbort;
 159         }
 160         ev_async_send (event_db, &DBAddJob);
 161         pthread_mutex_unlock(&DBEventExitQueueMutex);
 162
 163         EVM_syslog(LOG_DEBUG, "DBEVENT Q Done.\n");
 164         return eDBQuery;
 165 }
 166
 167 void StopDBWatchers(AsyncIO *IO)
 168 {
 169         SetEVState(IO, eDBStop);
 170         ev_cleanup_stop(event_db, &IO->db_abort_by_shutdown);
 171         ev_idle_stop(event_db, &IO->db_unwind_stack);
 172 }
 173
 174 void ShutDownDBCLient(AsyncIO *IO)
 175 {
 176         CitContext *Ctx =IO->CitContext;
 177         become_session(Ctx);
 178
 179         SetEVState(IO, eDBTerm);
 180         EVM_syslog(LOG_DEBUG, "DBEVENT Terminating.\n");
 181         StopDBWatchers(IO);
 182
 183         assert(IO->DBTerminate);
 184         IO->DBTerminate(IO);
 185 }
 186
 187 void
 188 DB_PerformNext(struct ev_loop *loop, ev_idle *watcher, int revents)
 189 {
 190         AsyncIO *IO = watcher->data;
 191
 192         SetEVState(IO, eDBNext);
 193         IO->Now = ev_now(event_db);
 194         EV_syslog(LOG_DEBUG, "%s()", __FUNCTION__);
 195         become_session(IO->CitContext);
 196
 197         ev_idle_stop(event_db, &IO->db_unwind_stack);
 198
 199         assert(IO->NextDBOperation);
 200         switch (IO->NextDBOperation(IO))
 201         {
 202         case eDBQuery:
 203                 break;
 204         case eSendDNSQuery:
 205         case eReadDNSReply:
 206         case eConnect:
 207         case eSendReply:
 208         case eSendMore:
 209         case eSendFile:
 210         case eReadMessage:
 211         case eReadMore:
 212         case eReadPayload:
 213         case eReadFile:
 214                 ev_cleanup_stop(loop, &IO->db_abort_by_shutdown);
 215                 break;
 216         case eTerminateConnection:
 217         case eAbort:
 218                 ev_idle_stop(event_db, &IO->db_unwind_stack);
 219                 ev_cleanup_stop(loop, &IO->db_abort_by_shutdown);
 220                 ShutDownDBCLient(IO);
 221         }
 222 }
 223
 224 eNextState NextDBOperation(AsyncIO *IO, IO_CallBack CB)
 225 {
 226         SetEVState(IO, eQDBNext);
 227         IO->NextDBOperation = CB;
 228         ev_idle_init(&IO->db_unwind_stack,
 229                      DB_PerformNext);
 230         IO->db_unwind_stack.data = IO;
 231         ev_idle_start(event_db, &IO->db_unwind_stack);
 232         return eDBQuery;
 233 }
 234
 235 /*------------------------------------------------------------------------------
 236  *                      Client IO
 237  *----------------------------------------------------------------------------*/
 238 extern int evbase_count;
 239 extern pthread_mutex_t EventQueueMutex;
 240 extern pthread_mutex_t EventExitQueueMutex;
 241 extern HashList *InboundEventQueue;
 242 extern struct ev_loop *event_base;
 243 extern ev_async AddJob;
 244 extern ev_async ExitEventLoop;
 245
 246 static void IO_abort_shutdown_callback(struct ev_loop *loop,
 247                                        ev_cleanup *watcher,
 248                                        int revents)
 249 {
 250         AsyncIO *IO = watcher->data;
 251
 252         SetEVState(IO, eIOAbort);
 253         EV_syslog(LOG_DEBUG, "EVENT Q: %s\n", __FUNCTION__);
 254         IO->Now = ev_now(event_base);
 255         assert(IO->ShutdownAbort);
 256         IO->ShutdownAbort(IO);
 257 }
 258
 259
 260 eNextState QueueEventContext(AsyncIO *IO, IO_CallBack CB)
 261 {
 262         IOAddHandler *h;
 263         int i;
 264
 265         SetEVState(IO, eIOQ);
 266         h = (IOAddHandler*)malloc(sizeof(IOAddHandler));
 267         h->IO = IO;
 268         h->EvAttch = CB;
 269         ev_cleanup_init(&IO->abort_by_shutdown,
 270                         IO_abort_shutdown_callback);
 271         IO->abort_by_shutdown.data = IO;
 272
 273         pthread_mutex_lock(&EventQueueMutex);
 274         if (InboundEventQueue == NULL)
 275         {
 276                 free(h);
 277                 /* shutting down... */
 278                 EVM_syslog(LOG_DEBUG, "EVENT Q exiting.\n");
 279                 pthread_mutex_unlock(&EventQueueMutex);
 280                 return eAbort;
 281         }
 282         EVM_syslog(LOG_DEBUG, "EVENT Q\n");
 283         i = ++evbase_count;
 284         Put(InboundEventQueue, IKEY(i), h, NULL);
 285         pthread_mutex_unlock(&EventQueueMutex);
 286
 287         pthread_mutex_lock(&EventExitQueueMutex);
 288         if (event_base == NULL) {
 289                 pthread_mutex_unlock(&EventExitQueueMutex);
 290                 return eAbort;
 291         }
 292         ev_async_send (event_base, &AddJob);
 293         pthread_mutex_unlock(&EventExitQueueMutex);
 294         EVM_syslog(LOG_DEBUG, "EVENT Q Done.\n");
 295         return eSendReply;
 296 }
 297
 298 eNextState EventQueueDBOperation(AsyncIO *IO, IO_CallBack CB)
 299 {
 300         StopClientWatchers(IO, 0);
 301         return QueueDBOperation(IO, CB);
 302 }
 303 eNextState DBQueueEventContext(AsyncIO *IO, IO_CallBack CB)
 304 {
 305         StopDBWatchers(IO);
 306         return QueueEventContext(IO, CB);
 307 }
 308
 309 extern eNextState evcurl_handle_start(AsyncIO *IO);
 310
 311 eNextState QueueCurlContext(AsyncIO *IO)
 312 {
 313         IOAddHandler *h;
 314         int i;
 315
 316         SetEVState(IO, eCurlQ);
 317         h = (IOAddHandler*)malloc(sizeof(IOAddHandler));
 318         h->IO = IO;
 319         h->EvAttch = evcurl_handle_start;
 320
 321         pthread_mutex_lock(&EventQueueMutex);
 322         if (InboundEventQueue == NULL)
 323         {
 324                 /* shutting down... */
 325                 free(h);
 326                 EVM_syslog(LOG_DEBUG, "EVENT Q exiting.\n");
 327                 pthread_mutex_unlock(&EventQueueMutex);
 328                 return eAbort;
 329         }
 330
 331         EVM_syslog(LOG_DEBUG, "EVENT Q\n");
 332         i = ++evbase_count;
 333         Put(InboundEventQueue, IKEY(i), h, NULL);
 334         pthread_mutex_unlock(&EventQueueMutex);
 335
 336         pthread_mutex_lock(&EventExitQueueMutex);
 337         if (event_base == NULL) {
 338                 pthread_mutex_unlock(&EventExitQueueMutex);
 339                 return eAbort;
 340         }
 341         ev_async_send (event_base, &AddJob);
 342         pthread_mutex_unlock(&EventExitQueueMutex);
 343
 344         EVM_syslog(LOG_DEBUG, "EVENT Q Done.\n");
 345         return eSendReply;
 346 }
 347
 348 eNextState CurlQueueDBOperation(AsyncIO *IO, IO_CallBack CB)
 349 {
 350         StopCurlWatchers(IO);
 351         return QueueDBOperation(IO, CB);
 352 }
 353
 354
 355 void DestructCAres(AsyncIO *IO);
 356 void FreeAsyncIOContents(AsyncIO *IO)
 357 {
 358         CitContext *Ctx = IO->CitContext;
 359
 360         FreeStrBuf(&IO->IOBuf);
 361         FreeStrBuf(&IO->SendBuf.Buf);
 362         FreeStrBuf(&IO->RecvBuf.Buf);
 363
 364         DestructCAres(IO);
 365
 366         FreeURL(&IO->ConnectMe);
 367         FreeStrBuf(&IO->HttpReq.ReplyData);
 368
 369         if (Ctx) {
 370                 Ctx->state = CON_IDLE;
 371                 Ctx->kill_me = 1;
 372                 IO->CitContext = NULL;
 373         }
 374 }
 375
 376
 377 void StopClientWatchers(AsyncIO *IO, int CloseFD)
 378 {
 379         ev_timer_stop (event_base, &IO->rw_timeout);
 380         ev_timer_stop(event_base, &IO->conn_fail);
 381         ev_idle_stop(event_base, &IO->unwind_stack);
 382         ev_cleanup_stop(event_base, &IO->abort_by_shutdown);
 383
 384         ev_io_stop(event_base, &IO->conn_event);
 385         ev_io_stop(event_base, &IO->send_event);
 386         ev_io_stop(event_base, &IO->recv_event);
 387
 388         if (CloseFD && (IO->SendBuf.fd > 0)) {
 389                 close(IO->SendBuf.fd);
 390                 IO->SendBuf.fd = 0;
 391                 IO->RecvBuf.fd = 0;
 392         }
 393 }
 394
 395 void StopCurlWatchers(AsyncIO *IO)
 396 {
 397         ev_timer_stop (event_base, &IO->rw_timeout);
 398         ev_timer_stop(event_base, &IO->conn_fail);
 399         ev_idle_stop(event_base, &IO->unwind_stack);
 400         ev_cleanup_stop(event_base, &IO->abort_by_shutdown);
 401
 402         ev_io_stop(event_base, &IO->conn_event);
 403         ev_io_stop(event_base, &IO->send_event);
 404         ev_io_stop(event_base, &IO->recv_event);
 405
 406         if (IO->SendBuf.fd != 0) {
 407                 close(IO->SendBuf.fd);
 408         }
 409         IO->SendBuf.fd = 0;
 410         IO->RecvBuf.fd = 0;
 411 }
 412
 413 void ShutDownCLient(AsyncIO *IO)
 414 {
 415         CitContext *Ctx =IO->CitContext;
 416
 417         SetEVState(IO, eExit);
 418         become_session(Ctx);
 419
 420         EVM_syslog(LOG_DEBUG, "EVENT Terminating \n");
 421
 422         StopClientWatchers(IO, 1);
 423
 424         if (IO->DNS.Channel != NULL) {
 425                 ares_destroy(IO->DNS.Channel);
 426                 EV_DNS_LOG_STOP(DNS.recv_event);
 427                 EV_DNS_LOG_STOP(DNS.send_event);
 428                 ev_io_stop(event_base, &IO->DNS.recv_event);
 429                 ev_io_stop(event_base, &IO->DNS.send_event);
 430                 IO->DNS.Channel = NULL;
 431         }
 432         assert(IO->Terminate);
 433         IO->Terminate(IO);
 434 }
 435
 436 void PostInbound(AsyncIO *IO)
 437 {
 438         switch (IO->NextState) {
 439         case eSendFile:
 440                 ev_io_start(event_base, &IO->send_event);
 441                 break;
 442         case eSendReply:
 443         case eSendMore:
 444                 assert(IO->SendDone);
 445                 IO->NextState = IO->SendDone(IO);
 446                 switch (IO->NextState)
 447                 {
 448                 case eSendFile:
 449                 case eSendReply:
 450                 case eSendMore:
 451                 case eReadMessage:
 452                 case eReadPayload:
 453                 case eReadMore:
 454                 case eReadFile:
 455                         ev_io_start(event_base, &IO->send_event);
 456                         break;
 457                 case eDBQuery:
 458                         StopClientWatchers(IO, 0);
 459                 default:
 460                         break;
 461                 }
 462                 break;
 463         case eReadPayload:
 464         case eReadMore:
 465         case eReadFile:
 466                 ev_io_start(event_base, &IO->recv_event);
 467                 break;
 468         case eTerminateConnection:
 469                 ShutDownCLient(IO);
 470                 break;
 471         case eAbort:
 472                 ShutDownCLient(IO);
 473                 break;
 474         case eSendDNSQuery:
 475         case eReadDNSReply:
 476         case eDBQuery:
 477         case eConnect:
 478         case eReadMessage:
 479                 break;
 480         }
 481 }
 482 eReadState HandleInbound(AsyncIO *IO)
 483 {
 484         const char *Err = NULL;
 485         eReadState Finished = eBufferNotEmpty;
 486
 487         become_session(IO->CitContext);
 488
 489         while ((Finished == eBufferNotEmpty) &&
 490                ((IO->NextState == eReadMessage)||
 491                 (IO->NextState == eReadMore)||
 492                 (IO->NextState == eReadFile)||
 493                 (IO->NextState == eReadPayload)))
 494         {
 495                 /* Reading lines...
 496                  * lex line reply in callback,
 497                  * or do it ourselves.
 498                  * i.e. as nnn-blabla means continue reading in SMTP
 499                  */
 500                 if ((IO->NextState == eReadFile) &&
 501                     (Finished == eBufferNotEmpty))
 502                 {
 503                         Finished = WriteIOBAlreadyRead(&IO->IOB, &Err);
 504                         if (Finished == eReadSuccess)
 505                         {
 506                                 IO->NextState = eSendReply;
 507                         }
 508                 }
 509                 else if (IO->LineReader)
 510                         Finished = IO->LineReader(IO);
 511                 else
 512                         Finished = StrBufChunkSipLine(IO->IOBuf,
 513                                                       &IO->RecvBuf);
 514
 515                 switch (Finished) {
 516                 case eMustReadMore: /// read new from socket...
 517                         break;
 518                 case eBufferNotEmpty: /* shouldn't happen... */
 519                 case eReadSuccess: /// done for now...
 520                         break;
 521                 case eReadFail: /// WHUT?
 522                                 ///todo: shut down!
 523                         break;
 524                 }
 525
 526                 if (Finished != eMustReadMore) {
 527                         assert(IO->ReadDone);
 528                         ev_io_stop(event_base, &IO->recv_event);
 529                         IO->NextState = IO->ReadDone(IO);
 530                         Finished = StrBufCheckBuffer(&IO->RecvBuf);
 531                 }
 532         }
 533
 534         PostInbound(IO);
 535
 536         return Finished;
 537 }
 538
 539
 540 static void
 541 IO_send_callback(struct ev_loop *loop, ev_io *watcher, int revents)
 542 {
 543         int rc;
 544         AsyncIO *IO = watcher->data;
 545         const char *errmsg = NULL;
 546
 547         IO->Now = ev_now(event_base);
 548         become_session(IO->CitContext);
 549 #ifdef BIGBAD_IODBG
 550         {
 551                 int rv = 0;
 552                 char fn [SIZ];
 553                 FILE *fd;
 554                 const char *pch = ChrPtr(IO->SendBuf.Buf);
 555                 const char *pchh = IO->SendBuf.ReadWritePointer;
 556                 long nbytes;
 557
 558                 if (pchh == NULL)
 559                         pchh = pch;
 560
 561                 nbytes = StrLength(IO->SendBuf.Buf) - (pchh - pch);
 562                 snprintf(fn, SIZ, "/tmp/foolog_ev_%s.%d",
 563                          ((CitContext*)(IO->CitContext))->ServiceName,
 564                          IO->SendBuf.fd);
 565
 566                 fd = fopen(fn, "a+");
 567                 fprintf(fd, "Send: BufSize: %ld BufContent: [",
 568                         nbytes);
 569                 rv = fwrite(pchh, nbytes, 1, fd);
 570                 if (!rv) printf("failed to write debug to %s!\n", fn);
 571                 fprintf(fd, "]\n");
 572 #endif
 573                 switch (IO->NextState) {
 574                 case eSendFile:
 575                         rc = FileSendChunked(&IO->IOB, &errmsg);
 576                         if (rc < 0)
 577                                 StrBufPlain(IO->ErrMsg, errmsg, -1);
 578                         break;
 579                 default:
 580                         rc = StrBuf_write_one_chunk_callback(IO->SendBuf.fd,
 581                                                              0,
 582                                                              &IO->SendBuf);
 583                 }
 584
 585 #ifdef BIGBAD_IODBG
 586                 fprintf(fd, "Sent: BufSize: %d bytes.\n", rc);
 587                 fclose(fd);
 588         }
 589 #endif
 590         if (rc == 0)
 591         {
 592                 ev_io_stop(event_base, &IO->send_event);
 593                 switch (IO->NextState) {
 594                 case eSendMore:
 595                         assert(IO->SendDone);
 596                         IO->NextState = IO->SendDone(IO);
 597
 598                         if ((IO->NextState == eTerminateConnection) ||
 599                             (IO->NextState == eAbort) )
 600                                 ShutDownCLient(IO);
 601                         else {
 602                                 ev_io_start(event_base, &IO->send_event);
 603                         }
 604                         break;
 605                 case eSendFile:
 606                         if (IO->IOB.ChunkSendRemain > 0) {
 607                                 ev_io_start(event_base, &IO->recv_event);
 608                                 SetNextTimeout(IO, 100.0);
 609
 610                         } else {
 611                                 assert(IO->ReadDone);
 612                                 IO->NextState = IO->ReadDone(IO);
 613                                 switch(IO->NextState) {
 614                                 case eSendDNSQuery:
 615                                 case eReadDNSReply:
 616                                 case eDBQuery:
 617                                 case eConnect:
 618                                         break;
 619                                 case eSendReply:
 620                                 case eSendMore:
 621                                 case eSendFile:
 622                                         ev_io_start(event_base,
 623                                                     &IO->send_event);
 624                                         break;
 625                                 case eReadMessage:
 626                                 case eReadMore:
 627                                 case eReadPayload:
 628                                 case eReadFile:
 629                                         break;
 630                                 case eTerminateConnection:
 631                                 case eAbort:
 632                                         break;
 633                                 }
 634                         }
 635                         break;
 636                 case eSendReply:
 637                     if (StrBufCheckBuffer(&IO->SendBuf) != eReadSuccess)
 638                         break;
 639                     IO->NextState = eReadMore;
 640                 case eReadMore:
 641                 case eReadMessage:
 642                 case eReadPayload:
 643                 case eReadFile:
 644                         if (StrBufCheckBuffer(&IO->RecvBuf) == eBufferNotEmpty)
 645                         {
 646                                 HandleInbound(IO);
 647                         }
 648                         else {
 649                                 ev_io_start(event_base, &IO->recv_event);
 650                         }
 651
 652                         break;
 653                 case eDBQuery:
 654                         /*
 655                          * we now live in another queue,
 656                          * so we have to unregister.
 657                          */
 658                         ev_cleanup_stop(loop, &IO->abort_by_shutdown);
 659                         break;
 660                 case eSendDNSQuery:
 661                 case eReadDNSReply:
 662                 case eConnect:
 663                 case eTerminateConnection:
 664                 case eAbort:
 665                         break;
 666                 }
 667         }
 668         else if (rc < 0) {
 669                 if (errno != EAGAIN) {
 670                         StopClientWatchers(IO, 1);
 671                         EV_syslog(LOG_DEBUG,
 672                                   "IO_send_callback(): Socket Invalid! [%d] [%s] [%d]\n",
 673                                   errno, strerror(errno), IO->SendBuf.fd);
 674                         StrBufPrintf(IO->ErrMsg,
 675                                      "Socket Invalid! [%s]",
 676                                      strerror(errno));
 677                         SetNextTimeout(IO, 0.01);
 678                 }
 679         }
 680         /* else : must write more. */
 681 }
 682 static void
 683 set_start_callback(struct ev_loop *loop, AsyncIO *IO, int revents)
 684 {
 685         ev_timer_stop(event_base, &IO->conn_fail);
 686         ev_timer_start(event_base, &IO->rw_timeout);
 687
 688         switch(IO->NextState) {
 689         case eReadMore:
 690         case eReadMessage:
 691         case eReadFile:
 692                 StrBufAppendBufPlain(IO->ErrMsg, HKEY("[while waiting for greeting]"), 0);
 693                 ev_io_start(event_base, &IO->recv_event);
 694                 break;
 695         case eSendReply:
 696         case eSendMore:
 697         case eReadPayload:
 698         case eSendFile:
 699                 become_session(IO->CitContext);
 700                 IO_send_callback(loop, &IO->send_event, revents);
 701                 break;
 702         case eDBQuery:
 703         case eSendDNSQuery:
 704         case eReadDNSReply:
 705         case eConnect:
 706         case eTerminateConnection:
 707         case eAbort:
 708                 /// TODO: WHUT?
 709                 break;
 710         }
 711 }
 712
 713 static void
 714 IO_Timeout_callback(struct ev_loop *loop, ev_timer *watcher, int revents)
 715 {
 716         AsyncIO *IO = watcher->data;
 717
 718         SetEVState(IO, eIOTimeout);
 719         IO->Now = ev_now(event_base);
 720         ev_timer_stop (event_base, &IO->rw_timeout);
 721         become_session(IO->CitContext);
 722
 723         if (IO->SendBuf.fd != 0)
 724         {
 725                 ev_io_stop(event_base, &IO->send_event);
 726                 ev_io_stop(event_base, &IO->recv_event);
 727                 ev_timer_stop (event_base, &IO->rw_timeout);
 728                 close(IO->SendBuf.fd);
 729                 IO->SendBuf.fd = IO->RecvBuf.fd = 0;
 730         }
 731
 732         assert(IO->Timeout);
 733         switch (IO->Timeout(IO))
 734         {
 735         case eAbort:
 736                 ShutDownCLient(IO);
 737         default:
 738                 break;
 739         }
 740 }
 741
 742 static void
 743 IO_connfail_callback(struct ev_loop *loop, ev_timer *watcher, int revents)
 744 {
 745         AsyncIO *IO = watcher->data;
 746
 747         SetEVState(IO, eIOConnfail);
 748         IO->Now = ev_now(event_base);
 749         ev_timer_stop (event_base, &IO->conn_fail);
 750
 751         if (IO->SendBuf.fd != 0)
 752         {
 753                 ev_io_stop(loop, &IO->conn_event);
 754                 ev_io_stop(event_base, &IO->send_event);
 755                 ev_io_stop(event_base, &IO->recv_event);
 756                 ev_timer_stop (event_base, &IO->rw_timeout);
 757                 close(IO->SendBuf.fd);
 758                 IO->SendBuf.fd = IO->RecvBuf.fd = 0;
 759         }
 760         become_session(IO->CitContext);
 761
 762         assert(IO->ConnFail);
 763         switch (IO->ConnFail(IO))
 764         {
 765         case eAbort:
 766                 ShutDownCLient(IO);
 767         default:
 768                 break;
 769
 770         }
 771 }
 772
 773 static void
 774 IO_connfailimmediate_callback(struct ev_loop *loop,
 775                               ev_idle *watcher,
 776                               int revents)
 777 {
 778         AsyncIO *IO = watcher->data;
 779
 780         SetEVState(IO, eIOConnfailNow);
 781         IO->Now = ev_now(event_base);
 782         ev_idle_stop (event_base, &IO->conn_fail_immediate);
 783
 784         if (IO->SendBuf.fd != 0)
 785         {
 786                 close(IO->SendBuf.fd);
 787                 IO->SendBuf.fd = IO->RecvBuf.fd = 0;
 788         }
 789         become_session(IO->CitContext);
 790
 791         assert(IO->ConnFail);
 792         switch (IO->ConnFail(IO))
 793         {
 794         case eAbort:
 795                 ShutDownCLient(IO);
 796         default:
 797                 break;
 798
 799         }
 800 }
 801
 802 static void
 803 IO_connestd_callback(struct ev_loop *loop, ev_io *watcher, int revents)
 804 {
 805         AsyncIO *IO = watcher->data;
 806         int             so_err = 0;
 807         socklen_t       lon = sizeof(so_err);
 808         int             err;
 809
 810         SetEVState(IO, eIOConnNow);
 811         IO->Now = ev_now(event_base);
 812         EVM_syslog(LOG_DEBUG, "connect() succeeded.\n");
 813
 814         ev_io_stop(loop, &IO->conn_event);
 815         ev_timer_stop(event_base, &IO->conn_fail);
 816
 817         err = getsockopt(IO->SendBuf.fd,
 818                          SOL_SOCKET,
 819                          SO_ERROR,
 820                          (void*)&so_err,
 821                          &lon);
 822
 823         if ((err == 0) && (so_err != 0))
 824         {
 825                 EV_syslog(LOG_DEBUG, "connect() failed [%d][%s]\n",
 826                           so_err,
 827                           strerror(so_err));
 828                 IO_connfail_callback(loop, &IO->conn_fail, revents);
 829
 830         }
 831         else
 832         {
 833                 EVM_syslog(LOG_DEBUG, "connect() succeeded\n");
 834                 set_start_callback(loop, IO, revents);
 835         }
 836 }
 837
 838 static void
 839 IO_recv_callback(struct ev_loop *loop, ev_io *watcher, int revents)
 840 {
 841         const char *errmsg;
 842         ssize_t nbytes;
 843         AsyncIO *IO = watcher->data;
 844
 845         IO->Now = ev_now(event_base);
 846         switch (IO->NextState) {
 847         case eReadFile:
 848                 nbytes = FileRecvChunked(&IO->IOB, &errmsg);
 849                 if (nbytes < 0)
 850                         StrBufPlain(IO->ErrMsg, errmsg, -1);
 851                 else
 852                 {
 853                         if (IO->IOB.ChunkSendRemain == 0)
 854                         {
 855                                 IO->NextState = eSendReply;
 856                                 assert(IO->ReadDone);
 857                                 ev_io_stop(event_base, &IO->recv_event);
 858                                 PostInbound(IO);
 859                                 return;
 860                         }
 861                         else
 862                                 return;
 863                 }
 864                 break;
 865         default:
 866                 nbytes = StrBuf_read_one_chunk_callback(IO->RecvBuf.fd,
 867                                                         0,
 868                                                         &IO->RecvBuf);
 869                 break;
 870         }
 871
 872 #ifdef BIGBAD_IODBG
 873         {
 874                 long nbytes;
 875                 int rv = 0;
 876                 char fn [SIZ];
 877                 FILE *fd;
 878                 const char *pch = ChrPtr(IO->RecvBuf.Buf);
 879                 const char *pchh = IO->RecvBuf.ReadWritePointer;
 880
 881                 if (pchh == NULL)
 882                         pchh = pch;
 883
 884                 nbytes = StrLength(IO->RecvBuf.Buf) - (pchh - pch);
 885                 snprintf(fn, SIZ, "/tmp/foolog_ev_%s.%d",
 886                          ((CitContext*)(IO->CitContext))->ServiceName,
 887                          IO->SendBuf.fd);
 888
 889                 fd = fopen(fn, "a+");
 890                 fprintf(fd, "Read: BufSize: %ld BufContent: [",
 891                         nbytes);
 892                 rv = fwrite(pchh, nbytes, 1, fd);
 893                 if (!rv) printf("failed to write debug to %s!\n", fn);
 894                 fprintf(fd, "]\n");
 895                 fclose(fd);
 896         }
 897 #endif
 898         if (nbytes > 0) {
 899                 HandleInbound(IO);
 900         } else if (nbytes == 0) {
 901                 StopClientWatchers(IO, 1);
 902                 SetNextTimeout(IO, 0.01);
 903                 return;
 904         } else if (nbytes == -1) {
 905                 if (errno != EAGAIN) {
 906                         // FD is gone. kick it.
 907                         StopClientWatchers(IO, 1);
 908                         EV_syslog(LOG_DEBUG,
 909                                   "IO_recv_callback(): Socket Invalid! [%d] [%s] [%d]\n",
 910                                   errno, strerror(errno), IO->SendBuf.fd);
 911                         StrBufPrintf(IO->ErrMsg,
 912                                      "Socket Invalid! [%s]",
 913                                      strerror(errno));
 914                         SetNextTimeout(IO, 0.01);
 915                 }
 916                 return;
 917         }
 918 }
 919
 920 void
 921 IO_postdns_callback(struct ev_loop *loop, ev_idle *watcher, int revents)
 922 {
 923         AsyncIO *IO = watcher->data;
 924
 925         SetEVState(IO, eCaresFinished);
 926         IO->Now = ev_now(event_base);
 927         EV_syslog(LOG_DEBUG, "event: %s\n", __FUNCTION__);
 928         become_session(IO->CitContext);
 929         assert(IO->DNS.Query->PostDNS);
 930         switch (IO->DNS.Query->PostDNS(IO))
 931         {
 932         case eAbort:
 933                 assert(IO->DNS.Fail);
 934                 switch (IO->DNS.Fail(IO)) {
 935                 case eAbort:
 936 ////                    StopClientWatchers(IO);
 937                         ShutDownCLient(IO);
 938                 default:
 939                         break;
 940                 }
 941         default:
 942                 break;
 943         }
 944 }
 945
 946
 947 eNextState EvConnectSock(AsyncIO *IO,
 948                          double conn_timeout,
 949                          double first_rw_timeout,
 950                          int ReadFirst)
 951 {
 952         struct sockaddr_in egress_sin;
 953         int fdflags;
 954         int rc = -1;
 955
 956         SetEVState(IO, eIOConnectSock);
 957         become_session(IO->CitContext);
 958
 959         if (ReadFirst) {
 960                 IO->NextState = eReadMessage;
 961         }
 962         else {
 963                 IO->NextState = eSendReply;
 964         }
 965
 966         IO->SendBuf.fd = IO->RecvBuf.fd =
 967                 socket(
 968                         (IO->ConnectMe->IPv6)?PF_INET6:PF_INET,
 969                         SOCK_STREAM,
 970                         IPPROTO_TCP);
 971
 972         if (IO->SendBuf.fd < 0) {
 973                 EV_syslog(LOG_ERR,
 974                           "EVENT: socket() failed: %s\n",
 975                           strerror(errno));
 976
 977                 StrBufPrintf(IO->ErrMsg,
 978                              "Failed to create socket: %s",
 979                              strerror(errno));
 980                 IO->SendBuf.fd = IO->RecvBuf.fd = 0;
 981                 return eAbort;
 982         }
 983         fdflags = fcntl(IO->SendBuf.fd, F_GETFL);
 984         if (fdflags < 0) {
 985                 EV_syslog(LOG_ERR,
 986                           "EVENT: unable to get socket %d flags! %s \n",
 987                           IO->SendBuf.fd,
 988                           strerror(errno));
 989                 StrBufPrintf(IO->ErrMsg,
 990                              "Failed to get socket %d flags: %s",
 991                              IO->SendBuf.fd,
 992                              strerror(errno));
 993                 close(IO->SendBuf.fd);
 994                 IO->SendBuf.fd = IO->RecvBuf.fd = 0;
 995                 return eAbort;
 996         }
 997         fdflags = fdflags | O_NONBLOCK;
 998         if (fcntl(IO->SendBuf.fd, F_SETFL, fdflags) < 0) {
 999                 EV_syslog(
1000                         LOG_ERR,
1001                         "EVENT: unable to set socket %d nonblocking flags! %s \n",
1002                         IO->SendBuf.fd,
1003                         strerror(errno));
1004                 StrBufPrintf(IO->ErrMsg,
1005                              "Failed to set socket flags: %s",
1006                              strerror(errno));
1007                 close(IO->SendBuf.fd);
1008                 IO->SendBuf.fd = IO->RecvBuf.fd = 0;
1009                 return eAbort;
1010         }
1011 /* TODO: maye we could use offsetof() to calc the position of data...
1012  * http://doc.dvgu.ru/devel/ev.html#associating_custom_data_with_a_watcher
1013  */
1014         ev_io_init(&IO->recv_event, IO_recv_callback, IO->RecvBuf.fd, EV_READ);
1015         IO->recv_event.data = IO;
1016         ev_io_init(&IO->send_event, IO_send_callback, IO->SendBuf.fd, EV_WRITE);
1017         IO->send_event.data = IO;
1018
1019         ev_timer_init(&IO->conn_fail, IO_connfail_callback, conn_timeout, 0);
1020         IO->conn_fail.data = IO;
1021         ev_timer_init(&IO->rw_timeout, IO_Timeout_callback, first_rw_timeout,0);
1022         IO->rw_timeout.data = IO;
1023
1024
1025
1026
1027         /* for debugging you may bypass it like this:
1028          * IO->Addr.sin_addr.s_addr = inet_addr("127.0.0.1");
1029          * ((struct sockaddr_in)IO->ConnectMe->Addr).sin_addr.s_addr =
1030          *   inet_addr("127.0.0.1");
1031          */
1032         if (IO->ConnectMe->IPv6) {
1033                 rc = connect(IO->SendBuf.fd,
1034                              &IO->ConnectMe->Addr,
1035                              sizeof(struct sockaddr_in6));
1036         }
1037         else {
1038                 /* If citserver is bound to a specific IP address on the host, make
1039                  * sure we use that address for outbound connections.
1040                  */
1041
1042                 memset(&egress_sin, 0, sizeof(egress_sin));
1043                 egress_sin.sin_family = AF_INET;
1044                 if (!IsEmptyStr(config.c_ip_addr)) {
1045                         egress_sin.sin_addr.s_addr = inet_addr(config.c_ip_addr);
1046                         if (egress_sin.sin_addr.s_addr == !INADDR_ANY) {
1047                                 egress_sin.sin_addr.s_addr = INADDR_ANY;
1048                         }
1049
1050                         /* If this bind fails, no problem; we can still use INADDR_ANY */
1051                         bind(IO->SendBuf.fd, (struct sockaddr *)&egress_sin, sizeof(egress_sin));
1052                 }
1053                 rc = connect(IO->SendBuf.fd,
1054                              (struct sockaddr_in *)&IO->ConnectMe->Addr,
1055                              sizeof(struct sockaddr_in));
1056         }
1057
1058         if (rc >= 0){
1059                 SetEVState(IO, eIOConnNow);
1060                 EV_syslog(LOG_DEBUG, "connect() = %d immediate success.\n", IO->SendBuf.fd);
1061                 set_start_callback(event_base, IO, 0);
1062                 return IO->NextState;
1063         }
1064         else if (errno == EINPROGRESS) {
1065                 SetEVState(IO, eIOConnWait);
1066                 EV_syslog(LOG_DEBUG, "connect() = %d have to wait now.\n", IO->SendBuf.fd);
1067
1068                 ev_io_init(&IO->conn_event,
1069                            IO_connestd_callback,
1070                            IO->SendBuf.fd,
1071                            EV_READ|EV_WRITE);
1072
1073                 IO->conn_event.data = IO;
1074
1075                 ev_io_start(event_base, &IO->conn_event);
1076                 ev_timer_start(event_base, &IO->conn_fail);
1077                 return IO->NextState;
1078         }
1079         else {
1080                 SetEVState(IO, eIOConnfail);
1081                 ev_idle_init(&IO->conn_fail_immediate,
1082                              IO_connfailimmediate_callback);
1083                 IO->conn_fail_immediate.data = IO;
1084                 ev_idle_start(event_base, &IO->conn_fail_immediate);
1085
1086                 EV_syslog(LOG_ERR,
1087                           "connect() = %d failed: %s\n",
1088                           IO->SendBuf.fd,
1089                           strerror(errno));
1090
1091                 StrBufPrintf(IO->ErrMsg,
1092                              "Failed to connect: %s",
1093                              strerror(errno));
1094                 return IO->NextState;
1095         }
1096         return IO->NextState;
1097 }
1098
1099 void SetNextTimeout(AsyncIO *IO, double timeout)
1100 {
1101         IO->rw_timeout.repeat = timeout;
1102         ev_timer_again (event_base,  &IO->rw_timeout);
1103 }
1104
1105
1106 eNextState ReAttachIO(AsyncIO *IO,
1107                       void *pData,
1108                       int ReadFirst)
1109 {
1110         SetEVState(IO, eIOAttach);
1111         IO->Data = pData;
1112         become_session(IO->CitContext);
1113         ev_cleanup_start(event_base, &IO->abort_by_shutdown);
1114         if (ReadFirst) {
1115                 IO->NextState = eReadMessage;
1116         }
1117         else {
1118                 IO->NextState = eSendReply;
1119         }
1120         set_start_callback(event_base, IO, 0);
1121
1122         return IO->NextState;
1123 }
1124
1125 void InitIOStruct(AsyncIO *IO,
1126                   void *Data,
1127                   eNextState NextState,
1128                   IO_LineReaderCallback LineReader,
1129                   IO_CallBack DNS_Fail,
1130                   IO_CallBack SendDone,
1131                   IO_CallBack ReadDone,
1132                   IO_CallBack Terminate,
1133                   IO_CallBack DBTerminate,
1134                   IO_CallBack ConnFail,
1135                   IO_CallBack Timeout,
1136                   IO_CallBack ShutdownAbort)
1137 {
1138         IO->Data          = Data;
1139
1140         IO->CitContext    = CloneContext(CC);
1141         IO->CitContext->session_specific_data = Data;
1142         IO->CitContext->IO = IO;
1143
1144         IO->NextState     = NextState;
1145
1146         IO->SendDone      = SendDone;
1147         IO->ReadDone      = ReadDone;
1148         IO->Terminate     = Terminate;
1149         IO->DBTerminate   = DBTerminate;
1150         IO->LineReader    = LineReader;
1151         IO->ConnFail      = ConnFail;
1152         IO->Timeout       = Timeout;
1153         IO->ShutdownAbort = ShutdownAbort;
1154
1155         IO->DNS.Fail      = DNS_Fail;
1156
1157         IO->SendBuf.Buf   = NewStrBufPlain(NULL, 1024);
1158         IO->RecvBuf.Buf   = NewStrBufPlain(NULL, 1024);
1159         IO->IOBuf         = NewStrBuf();
1160         EV_syslog(LOG_DEBUG,
1161                   "EVENT: Session lives at %p IO at %p \n",
1162                   Data, IO);
1163
1164 }
1165
1166 extern int evcurl_init(AsyncIO *IO);
1167
1168 int InitcURLIOStruct(AsyncIO *IO,
1169                      void *Data,
1170                      const char* Desc,
1171                      IO_CallBack SendDone,
1172                      IO_CallBack Terminate,
1173                      IO_CallBack DBTerminate,
1174                      IO_CallBack ShutdownAbort)
1175 {
1176         IO->Data          = Data;
1177
1178         IO->CitContext    = CloneContext(CC);
1179         IO->CitContext->session_specific_data = Data;
1180         IO->CitContext->IO = IO;
1181
1182         IO->SendDone      = SendDone;
1183         IO->Terminate     = Terminate;
1184         IO->DBTerminate   = DBTerminate;
1185         IO->ShutdownAbort = ShutdownAbort;
1186
1187         strcpy(IO->HttpReq.errdesc, Desc);
1188
1189
1190         return  evcurl_init(IO);
1191
1192 }
1193
1194
1195 typedef struct KillOtherSessionContext {
1196         AsyncIO IO;
1197         AsyncIO *OtherOne;
1198 }KillOtherSessionContext;
1199
1200 eNextState KillTerminate(AsyncIO *IO)
1201 {
1202         long id;
1203         KillOtherSessionContext *Ctx = (KillOtherSessionContext*)IO->Data;
1204         EV_syslog(LOG_DEBUG, "%s Exit\n", __FUNCTION__);
1205         id = IO->ID;
1206         FreeAsyncIOContents(IO);
1207         memset(Ctx, 0, sizeof(KillOtherSessionContext));
1208         IO->ID = id; /* just for the case we want to analyze it in a coredump */
1209         free(Ctx);
1210         return eAbort;
1211
1212 }
1213
1214 eNextState KillShutdown(AsyncIO *IO)
1215 {
1216         return eTerminateConnection;
1217 }
1218
1219 eNextState KillOtherContextNow(AsyncIO *IO)
1220 {
1221         KillOtherSessionContext *Ctx = IO->Data;
1222
1223         SetEVState(IO, eKill);
1224
1225         if (Ctx->OtherOne->ShutdownAbort != NULL)
1226                 Ctx->OtherOne->ShutdownAbort(Ctx->OtherOne);
1227         return eTerminateConnection;
1228 }
1229
1230 void KillAsyncIOContext(AsyncIO *IO)
1231 {
1232         KillOtherSessionContext *Ctx;
1233
1234         Ctx = (KillOtherSessionContext*) malloc(sizeof(KillOtherSessionContext));
1235         memset(Ctx, 0, sizeof(KillOtherSessionContext));
1236
1237         InitIOStruct(&Ctx->IO,
1238                      Ctx,
1239                      eReadMessage,
1240                      NULL,
1241                      NULL,
1242                      NULL,
1243                      NULL,
1244                      KillTerminate,
1245                      NULL,
1246                      NULL,
1247                      NULL,
1248                      KillShutdown);
1249
1250         Ctx->OtherOne = IO;
1251
1252         switch(IO->NextState) {
1253         case eSendDNSQuery:
1254         case eReadDNSReply:
1255
1256         case eConnect:
1257         case eSendReply:
1258         case eSendMore:
1259         case eSendFile:
1260
1261         case eReadMessage:
1262         case eReadMore:
1263         case eReadPayload:
1264         case eReadFile:
1265                 QueueEventContext(&Ctx->IO, KillOtherContextNow);
1266                 break;
1267         case eDBQuery:
1268                 QueueDBOperation(&Ctx->IO, KillOtherContextNow);
1269                 break;
1270         case eTerminateConnection:
1271         case eAbort:
1272                 /*hm, its already dying, dunno which Queue its in... */
1273                 free(Ctx);
1274         }
1275
1276 }
1277
1278 extern int DebugEventLoopBacktrace;
1279 void EV_backtrace(AsyncIO *IO)
1280 {
1281 #ifdef HAVE_BACKTRACE
1282         void *stack_frames[50];
1283         size_t size, i;
1284         char **strings;
1285
1286         if ((IO == NULL) || (DebugEventLoopBacktrace == 0))
1287                 return;
1288         size = backtrace(stack_frames, sizeof(stack_frames) / sizeof(void*));
1289         strings = backtrace_symbols(stack_frames, size);
1290         for (i = 0; i < size; i++) {
1291                 if (strings != NULL) {
1292                         EV_syslog(LOG_ALERT, " BT %s\n", strings[i]);
1293                 }
1294                 else {
1295                         EV_syslog(LOG_ALERT, " BT %p\n", stack_frames[i]);
1296                 }
1297         }
1298         free(strings);
1299 #endif
1300 }
1301
1302
1303 ev_tstamp ctdl_ev_now (void)
1304 {
1305         return ev_now(event_base);
1306 }