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         curl_easy_cleanup(IO->HttpReq.chnd);
 407         IO->HttpReq.chnd = NULL;
 408
 409         if (IO->SendBuf.fd != 0) {
 410                 close(IO->SendBuf.fd);
 411         }
 412         IO->SendBuf.fd = 0;
 413         IO->RecvBuf.fd = 0;
 414 }
 415
 416 void ShutDownCLient(AsyncIO *IO)
 417 {
 418         CitContext *Ctx =IO->CitContext;
 419
 420         SetEVState(IO, eExit);
 421         become_session(Ctx);
 422
 423         EVM_syslog(LOG_DEBUG, "EVENT Terminating \n");
 424
 425         StopClientWatchers(IO, 1);
 426
 427         if (IO->DNS.Channel != NULL) {
 428                 ares_destroy(IO->DNS.Channel);
 429                 EV_DNS_LOG_STOP(DNS.recv_event);
 430                 EV_DNS_LOG_STOP(DNS.send_event);
 431                 ev_io_stop(event_base, &IO->DNS.recv_event);
 432                 ev_io_stop(event_base, &IO->DNS.send_event);
 433                 IO->DNS.Channel = NULL;
 434         }
 435         assert(IO->Terminate);
 436         IO->Terminate(IO);
 437 }
 438
 439 void PostInbound(AsyncIO *IO)
 440 {
 441         switch (IO->NextState) {
 442         case eSendFile:
 443                 ev_io_start(event_base, &IO->send_event);
 444                 break;
 445         case eSendReply:
 446         case eSendMore:
 447                 assert(IO->SendDone);
 448                 IO->NextState = IO->SendDone(IO);
 449                 switch (IO->NextState)
 450                 {
 451                 case eSendFile:
 452                 case eSendReply:
 453                 case eSendMore:
 454                 case eReadMessage:
 455                 case eReadPayload:
 456                 case eReadMore:
 457                 case eReadFile:
 458                         ev_io_start(event_base, &IO->send_event);
 459                         break;
 460                 case eDBQuery:
 461                         StopClientWatchers(IO, 0);
 462                 default:
 463                         break;
 464                 }
 465                 break;
 466         case eReadPayload:
 467         case eReadMore:
 468         case eReadFile:
 469                 ev_io_start(event_base, &IO->recv_event);
 470                 break;
 471         case eTerminateConnection:
 472                 ShutDownCLient(IO);
 473                 break;
 474         case eAbort:
 475                 ShutDownCLient(IO);
 476                 break;
 477         case eSendDNSQuery:
 478         case eReadDNSReply:
 479         case eDBQuery:
 480         case eConnect:
 481         case eReadMessage:
 482                 break;
 483         }
 484 }
 485 eReadState HandleInbound(AsyncIO *IO)
 486 {
 487         const char *Err = NULL;
 488         eReadState Finished = eBufferNotEmpty;
 489
 490         become_session(IO->CitContext);
 491
 492         while ((Finished == eBufferNotEmpty) &&
 493                ((IO->NextState == eReadMessage)||
 494                 (IO->NextState == eReadMore)||
 495                 (IO->NextState == eReadFile)||
 496                 (IO->NextState == eReadPayload)))
 497         {
 498                 /* Reading lines...
 499                  * lex line reply in callback,
 500                  * or do it ourselves.
 501                  * i.e. as nnn-blabla means continue reading in SMTP
 502                  */
 503                 if ((IO->NextState == eReadFile) &&
 504                     (Finished == eBufferNotEmpty))
 505                 {
 506                         Finished = WriteIOBAlreadyRead(&IO->IOB, &Err);
 507                         if (Finished == eReadSuccess)
 508                         {
 509                                 IO->NextState = eSendReply;
 510                         }
 511                 }
 512                 else if (IO->LineReader)
 513                         Finished = IO->LineReader(IO);
 514                 else
 515                         Finished = StrBufChunkSipLine(IO->IOBuf,
 516                                                       &IO->RecvBuf);
 517
 518                 switch (Finished) {
 519                 case eMustReadMore: /// read new from socket...
 520                         break;
 521                 case eBufferNotEmpty: /* shouldn't happen... */
 522                 case eReadSuccess: /// done for now...
 523                         break;
 524                 case eReadFail: /// WHUT?
 525                                 ///todo: shut down!
 526                         break;
 527                 }
 528
 529                 if (Finished != eMustReadMore) {
 530                         assert(IO->ReadDone);
 531                         ev_io_stop(event_base, &IO->recv_event);
 532                         IO->NextState = IO->ReadDone(IO);
 533                         Finished = StrBufCheckBuffer(&IO->RecvBuf);
 534                 }
 535         }
 536
 537         PostInbound(IO);
 538
 539         return Finished;
 540 }
 541
 542
 543 static void
 544 IO_send_callback(struct ev_loop *loop, ev_io *watcher, int revents)
 545 {
 546         int rc;
 547         AsyncIO *IO = watcher->data;
 548         const char *errmsg = NULL;
 549
 550         IO->Now = ev_now(event_base);
 551         become_session(IO->CitContext);
 552 #ifdef BIGBAD_IODBG
 553         {
 554                 int rv = 0;
 555                 char fn [SIZ];
 556                 FILE *fd;
 557                 const char *pch = ChrPtr(IO->SendBuf.Buf);
 558                 const char *pchh = IO->SendBuf.ReadWritePointer;
 559                 long nbytes;
 560
 561                 if (pchh == NULL)
 562                         pchh = pch;
 563
 564                 nbytes = StrLength(IO->SendBuf.Buf) - (pchh - pch);
 565                 snprintf(fn, SIZ, "/tmp/foolog_ev_%s.%d",
 566                          ((CitContext*)(IO->CitContext))->ServiceName,
 567                          IO->SendBuf.fd);
 568
 569                 fd = fopen(fn, "a+");
 570                 fprintf(fd, "Send: BufSize: %ld BufContent: [",
 571                         nbytes);
 572                 rv = fwrite(pchh, nbytes, 1, fd);
 573                 if (!rv) printf("failed to write debug to %s!\n", fn);
 574                 fprintf(fd, "]\n");
 575 #endif
 576                 switch (IO->NextState) {
 577                 case eSendFile:
 578                         rc = FileSendChunked(&IO->IOB, &errmsg);
 579                         if (rc < 0)
 580                                 StrBufPlain(IO->ErrMsg, errmsg, -1);
 581                         break;
 582                 default:
 583                         rc = StrBuf_write_one_chunk_callback(IO->SendBuf.fd,
 584                                                              0,
 585                                                              &IO->SendBuf);
 586                 }
 587
 588 #ifdef BIGBAD_IODBG
 589                 fprintf(fd, "Sent: BufSize: %d bytes.\n", rc);
 590                 fclose(fd);
 591         }
 592 #endif
 593         if (rc == 0)
 594         {
 595                 ev_io_stop(event_base, &IO->send_event);
 596                 switch (IO->NextState) {
 597                 case eSendMore:
 598                         assert(IO->SendDone);
 599                         IO->NextState = IO->SendDone(IO);
 600
 601                         if ((IO->NextState == eTerminateConnection) ||
 602                             (IO->NextState == eAbort) )
 603                                 ShutDownCLient(IO);
 604                         else {
 605                                 ev_io_start(event_base, &IO->send_event);
 606                         }
 607                         break;
 608                 case eSendFile:
 609                         if (IO->IOB.ChunkSendRemain > 0) {
 610                                 ev_io_start(event_base, &IO->recv_event);
 611                                 SetNextTimeout(IO, 100.0);
 612
 613                         } else {
 614                                 assert(IO->ReadDone);
 615                                 IO->NextState = IO->ReadDone(IO);
 616                                 switch(IO->NextState) {
 617                                 case eSendDNSQuery:
 618                                 case eReadDNSReply:
 619                                 case eDBQuery:
 620                                 case eConnect:
 621                                         break;
 622                                 case eSendReply:
 623                                 case eSendMore:
 624                                 case eSendFile:
 625                                         ev_io_start(event_base,
 626                                                     &IO->send_event);
 627                                         break;
 628                                 case eReadMessage:
 629                                 case eReadMore:
 630                                 case eReadPayload:
 631                                 case eReadFile:
 632                                         break;
 633                                 case eTerminateConnection:
 634                                 case eAbort:
 635                                         break;
 636                                 }
 637                         }
 638                         break;
 639                 case eSendReply:
 640                     if (StrBufCheckBuffer(&IO->SendBuf) != eReadSuccess)
 641                         break;
 642                     IO->NextState = eReadMore;
 643                 case eReadMore:
 644                 case eReadMessage:
 645                 case eReadPayload:
 646                 case eReadFile:
 647                         if (StrBufCheckBuffer(&IO->RecvBuf) == eBufferNotEmpty)
 648                         {
 649                                 HandleInbound(IO);
 650                         }
 651                         else {
 652                                 ev_io_start(event_base, &IO->recv_event);
 653                         }
 654
 655                         break;
 656                 case eDBQuery:
 657                         /*
 658                          * we now live in another queue,
 659                          * so we have to unregister.
 660                          */
 661                         ev_cleanup_stop(loop, &IO->abort_by_shutdown);
 662                         break;
 663                 case eSendDNSQuery:
 664                 case eReadDNSReply:
 665                 case eConnect:
 666                 case eTerminateConnection:
 667                 case eAbort:
 668                         break;
 669                 }
 670         }
 671         else if (rc < 0) {
 672                 if (errno != EAGAIN) {
 673                         StopClientWatchers(IO, 1);
 674                         EV_syslog(LOG_DEBUG,
 675                                   "IO_send_callback(): Socket Invalid! [%d] [%s] [%d]\n",
 676                                   errno, strerror(errno), IO->SendBuf.fd);
 677                         StrBufPrintf(IO->ErrMsg,
 678                                      "Socket Invalid! [%s]",
 679                                      strerror(errno));
 680                         SetNextTimeout(IO, 0.01);
 681                 }
 682         }
 683         /* else : must write more. */
 684 }
 685 static void
 686 set_start_callback(struct ev_loop *loop, AsyncIO *IO, int revents)
 687 {
 688         ev_timer_stop(event_base, &IO->conn_fail);
 689         ev_timer_start(event_base, &IO->rw_timeout);
 690
 691         switch(IO->NextState) {
 692         case eReadMore:
 693         case eReadMessage:
 694         case eReadFile:
 695                 StrBufAppendBufPlain(IO->ErrMsg, HKEY("[while waiting for greeting]"), 0);
 696                 ev_io_start(event_base, &IO->recv_event);
 697                 break;
 698         case eSendReply:
 699         case eSendMore:
 700         case eReadPayload:
 701         case eSendFile:
 702                 become_session(IO->CitContext);
 703                 IO_send_callback(loop, &IO->send_event, revents);
 704                 break;
 705         case eDBQuery:
 706         case eSendDNSQuery:
 707         case eReadDNSReply:
 708         case eConnect:
 709         case eTerminateConnection:
 710         case eAbort:
 711                 /// TODO: WHUT?
 712                 break;
 713         }
 714 }
 715
 716 static void
 717 IO_Timeout_callback(struct ev_loop *loop, ev_timer *watcher, int revents)
 718 {
 719         AsyncIO *IO = watcher->data;
 720
 721         SetEVState(IO, eIOTimeout);
 722         IO->Now = ev_now(event_base);
 723         ev_timer_stop (event_base, &IO->rw_timeout);
 724         become_session(IO->CitContext);
 725
 726         if (IO->SendBuf.fd != 0)
 727         {
 728                 ev_io_stop(event_base, &IO->send_event);
 729                 ev_io_stop(event_base, &IO->recv_event);
 730                 ev_timer_stop (event_base, &IO->rw_timeout);
 731                 close(IO->SendBuf.fd);
 732                 IO->SendBuf.fd = IO->RecvBuf.fd = 0;
 733         }
 734
 735         assert(IO->Timeout);
 736         switch (IO->Timeout(IO))
 737         {
 738         case eAbort:
 739                 ShutDownCLient(IO);
 740         default:
 741                 break;
 742         }
 743 }
 744
 745 static void
 746 IO_connfail_callback(struct ev_loop *loop, ev_timer *watcher, int revents)
 747 {
 748         AsyncIO *IO = watcher->data;
 749
 750         SetEVState(IO, eIOConnfail);
 751         IO->Now = ev_now(event_base);
 752         ev_timer_stop (event_base, &IO->conn_fail);
 753
 754         if (IO->SendBuf.fd != 0)
 755         {
 756                 ev_io_stop(loop, &IO->conn_event);
 757                 ev_io_stop(event_base, &IO->send_event);
 758                 ev_io_stop(event_base, &IO->recv_event);
 759                 ev_timer_stop (event_base, &IO->rw_timeout);
 760                 close(IO->SendBuf.fd);
 761                 IO->SendBuf.fd = IO->RecvBuf.fd = 0;
 762         }
 763         become_session(IO->CitContext);
 764
 765         assert(IO->ConnFail);
 766         switch (IO->ConnFail(IO))
 767         {
 768         case eAbort:
 769                 ShutDownCLient(IO);
 770         default:
 771                 break;
 772
 773         }
 774 }
 775
 776 static void
 777 IO_connfailimmediate_callback(struct ev_loop *loop,
 778                               ev_idle *watcher,
 779                               int revents)
 780 {
 781         AsyncIO *IO = watcher->data;
 782
 783         SetEVState(IO, eIOConnfailNow);
 784         IO->Now = ev_now(event_base);
 785         ev_idle_stop (event_base, &IO->conn_fail_immediate);
 786
 787         if (IO->SendBuf.fd != 0)
 788         {
 789                 close(IO->SendBuf.fd);
 790                 IO->SendBuf.fd = IO->RecvBuf.fd = 0;
 791         }
 792         become_session(IO->CitContext);
 793
 794         assert(IO->ConnFail);
 795         switch (IO->ConnFail(IO))
 796         {
 797         case eAbort:
 798                 ShutDownCLient(IO);
 799         default:
 800                 break;
 801
 802         }
 803 }
 804
 805 static void
 806 IO_connestd_callback(struct ev_loop *loop, ev_io *watcher, int revents)
 807 {
 808         AsyncIO *IO = watcher->data;
 809         int             so_err = 0;
 810         socklen_t       lon = sizeof(so_err);
 811         int             err;
 812
 813         SetEVState(IO, eIOConnNow);
 814         IO->Now = ev_now(event_base);
 815         EVM_syslog(LOG_DEBUG, "connect() succeeded.\n");
 816
 817         ev_io_stop(loop, &IO->conn_event);
 818         ev_timer_stop(event_base, &IO->conn_fail);
 819
 820         err = getsockopt(IO->SendBuf.fd,
 821                          SOL_SOCKET,
 822                          SO_ERROR,
 823                          (void*)&so_err,
 824                          &lon);
 825
 826         if ((err == 0) && (so_err != 0))
 827         {
 828                 EV_syslog(LOG_DEBUG, "connect() failed [%d][%s]\n",
 829                           so_err,
 830                           strerror(so_err));
 831                 IO_connfail_callback(loop, &IO->conn_fail, revents);
 832
 833         }
 834         else
 835         {
 836                 EVM_syslog(LOG_DEBUG, "connect() succeeded\n");
 837                 set_start_callback(loop, IO, revents);
 838         }
 839 }
 840
 841 static void
 842 IO_recv_callback(struct ev_loop *loop, ev_io *watcher, int revents)
 843 {
 844         const char *errmsg;
 845         ssize_t nbytes;
 846         AsyncIO *IO = watcher->data;
 847
 848         IO->Now = ev_now(event_base);
 849         switch (IO->NextState) {
 850         case eReadFile:
 851                 nbytes = FileRecvChunked(&IO->IOB, &errmsg);
 852                 if (nbytes < 0)
 853                         StrBufPlain(IO->ErrMsg, errmsg, -1);
 854                 else
 855                 {
 856                         if (IO->IOB.ChunkSendRemain == 0)
 857                         {
 858                                 IO->NextState = eSendReply;
 859                                 assert(IO->ReadDone);
 860                                 ev_io_stop(event_base, &IO->recv_event);
 861                                 PostInbound(IO);
 862                                 return;
 863                         }
 864                         else
 865                                 return;
 866                 }
 867                 break;
 868         default:
 869                 nbytes = StrBuf_read_one_chunk_callback(IO->RecvBuf.fd,
 870                                                         0,
 871                                                         &IO->RecvBuf);
 872                 break;
 873         }
 874
 875 #ifdef BIGBAD_IODBG
 876         {
 877                 long nbytes;
 878                 int rv = 0;
 879                 char fn [SIZ];
 880                 FILE *fd;
 881                 const char *pch = ChrPtr(IO->RecvBuf.Buf);
 882                 const char *pchh = IO->RecvBuf.ReadWritePointer;
 883
 884                 if (pchh == NULL)
 885                         pchh = pch;
 886
 887                 nbytes = StrLength(IO->RecvBuf.Buf) - (pchh - pch);
 888                 snprintf(fn, SIZ, "/tmp/foolog_ev_%s.%d",
 889                          ((CitContext*)(IO->CitContext))->ServiceName,
 890                          IO->SendBuf.fd);
 891
 892                 fd = fopen(fn, "a+");
 893                 fprintf(fd, "Read: BufSize: %ld BufContent: [",
 894                         nbytes);
 895                 rv = fwrite(pchh, nbytes, 1, fd);
 896                 if (!rv) printf("failed to write debug to %s!\n", fn);
 897                 fprintf(fd, "]\n");
 898                 fclose(fd);
 899         }
 900 #endif
 901         if (nbytes > 0) {
 902                 HandleInbound(IO);
 903         } else if (nbytes == 0) {
 904                 StopClientWatchers(IO, 1);
 905                 SetNextTimeout(IO, 0.01);
 906                 return;
 907         } else if (nbytes == -1) {
 908                 if (errno != EAGAIN) {
 909                         // FD is gone. kick it.
 910                         StopClientWatchers(IO, 1);
 911                         EV_syslog(LOG_DEBUG,
 912                                   "IO_recv_callback(): Socket Invalid! [%d] [%s] [%d]\n",
 913                                   errno, strerror(errno), IO->SendBuf.fd);
 914                         StrBufPrintf(IO->ErrMsg,
 915                                      "Socket Invalid! [%s]",
 916                                      strerror(errno));
 917                         SetNextTimeout(IO, 0.01);
 918                 }
 919                 return;
 920         }
 921 }
 922
 923 void
 924 IO_postdns_callback(struct ev_loop *loop, ev_idle *watcher, int revents)
 925 {
 926         AsyncIO *IO = watcher->data;
 927
 928         SetEVState(IO, eCaresFinished);
 929         IO->Now = ev_now(event_base);
 930         EV_syslog(LOG_DEBUG, "event: %s\n", __FUNCTION__);
 931         become_session(IO->CitContext);
 932         assert(IO->DNS.Query->PostDNS);
 933         switch (IO->DNS.Query->PostDNS(IO))
 934         {
 935         case eAbort:
 936                 assert(IO->DNS.Fail);
 937                 switch (IO->DNS.Fail(IO)) {
 938                 case eAbort:
 939 ////                    StopClientWatchers(IO);
 940                         ShutDownCLient(IO);
 941                 default:
 942                         break;
 943                 }
 944         default:
 945                 break;
 946         }
 947 }
 948
 949
 950 eNextState EvConnectSock(AsyncIO *IO,
 951                          double conn_timeout,
 952                          double first_rw_timeout,
 953                          int ReadFirst)
 954 {
 955         struct sockaddr_in egress_sin;
 956         int fdflags;
 957         int rc = -1;
 958
 959         SetEVState(IO, eIOConnectSock);
 960         become_session(IO->CitContext);
 961
 962         if (ReadFirst) {
 963                 IO->NextState = eReadMessage;
 964         }
 965         else {
 966                 IO->NextState = eSendReply;
 967         }
 968
 969         IO->SendBuf.fd = IO->RecvBuf.fd =
 970                 socket(
 971                         (IO->ConnectMe->IPv6)?PF_INET6:PF_INET,
 972                         SOCK_STREAM,
 973                         IPPROTO_TCP);
 974
 975         if (IO->SendBuf.fd < 0) {
 976                 EV_syslog(LOG_ERR,
 977                           "EVENT: socket() failed: %s\n",
 978                           strerror(errno));
 979
 980                 StrBufPrintf(IO->ErrMsg,
 981                              "Failed to create socket: %s",
 982                              strerror(errno));
 983                 IO->SendBuf.fd = IO->RecvBuf.fd = 0;
 984                 return eAbort;
 985         }
 986         fdflags = fcntl(IO->SendBuf.fd, F_GETFL);
 987         if (fdflags < 0) {
 988                 EV_syslog(LOG_ERR,
 989                           "EVENT: unable to get socket %d flags! %s \n",
 990                           IO->SendBuf.fd,
 991                           strerror(errno));
 992                 StrBufPrintf(IO->ErrMsg,
 993                              "Failed to get socket %d flags: %s",
 994                              IO->SendBuf.fd,
 995                              strerror(errno));
 996                 close(IO->SendBuf.fd);
 997                 IO->SendBuf.fd = IO->RecvBuf.fd = 0;
 998                 return eAbort;
 999         }
1000         fdflags = fdflags | O_NONBLOCK;
1001         if (fcntl(IO->SendBuf.fd, F_SETFL, fdflags) < 0) {
1002                 EV_syslog(
1003                         LOG_ERR,
1004                         "EVENT: unable to set socket %d nonblocking flags! %s \n",
1005                         IO->SendBuf.fd,
1006                         strerror(errno));
1007                 StrBufPrintf(IO->ErrMsg,
1008                              "Failed to set socket flags: %s",
1009                              strerror(errno));
1010                 close(IO->SendBuf.fd);
1011                 IO->SendBuf.fd = IO->RecvBuf.fd = 0;
1012                 return eAbort;
1013         }
1014 /* TODO: maye we could use offsetof() to calc the position of data...
1015  * http://doc.dvgu.ru/devel/ev.html#associating_custom_data_with_a_watcher
1016  */
1017         ev_io_init(&IO->recv_event, IO_recv_callback, IO->RecvBuf.fd, EV_READ);
1018         IO->recv_event.data = IO;
1019         ev_io_init(&IO->send_event, IO_send_callback, IO->SendBuf.fd, EV_WRITE);
1020         IO->send_event.data = IO;
1021
1022         ev_timer_init(&IO->conn_fail, IO_connfail_callback, conn_timeout, 0);
1023         IO->conn_fail.data = IO;
1024         ev_timer_init(&IO->rw_timeout, IO_Timeout_callback, first_rw_timeout,0);
1025         IO->rw_timeout.data = IO;
1026
1027
1028
1029
1030         /* for debugging you may bypass it like this:
1031          * IO->Addr.sin_addr.s_addr = inet_addr("127.0.0.1");
1032          * ((struct sockaddr_in)IO->ConnectMe->Addr).sin_addr.s_addr =
1033          *   inet_addr("127.0.0.1");
1034          */
1035         if (IO->ConnectMe->IPv6) {
1036                 rc = connect(IO->SendBuf.fd,
1037                              &IO->ConnectMe->Addr,
1038                              sizeof(struct sockaddr_in6));
1039         }
1040         else {
1041                 /* If citserver is bound to a specific IP address on the host, make
1042                  * sure we use that address for outbound connections.
1043                  */
1044
1045                 memset(&egress_sin, 0, sizeof(egress_sin));
1046                 egress_sin.sin_family = AF_INET;
1047                 if (!IsEmptyStr(config.c_ip_addr)) {
1048                         egress_sin.sin_addr.s_addr = inet_addr(config.c_ip_addr);
1049                         if (egress_sin.sin_addr.s_addr == !INADDR_ANY) {
1050                                 egress_sin.sin_addr.s_addr = INADDR_ANY;
1051                         }
1052
1053                         /* If this bind fails, no problem; we can still use INADDR_ANY */
1054                         bind(IO->SendBuf.fd, (struct sockaddr *)&egress_sin, sizeof(egress_sin));
1055                 }
1056                 rc = connect(IO->SendBuf.fd,
1057                              (struct sockaddr_in *)&IO->ConnectMe->Addr,
1058                              sizeof(struct sockaddr_in));
1059         }
1060
1061         if (rc >= 0){
1062                 SetEVState(IO, eIOConnNow);
1063                 EV_syslog(LOG_DEBUG, "connect() = %d immediate success.\n", IO->SendBuf.fd);
1064                 set_start_callback(event_base, IO, 0);
1065                 return IO->NextState;
1066         }
1067         else if (errno == EINPROGRESS) {
1068                 SetEVState(IO, eIOConnWait);
1069                 EV_syslog(LOG_DEBUG, "connect() = %d have to wait now.\n", IO->SendBuf.fd);
1070
1071                 ev_io_init(&IO->conn_event,
1072                            IO_connestd_callback,
1073                            IO->SendBuf.fd,
1074                            EV_READ|EV_WRITE);
1075
1076                 IO->conn_event.data = IO;
1077
1078                 ev_io_start(event_base, &IO->conn_event);
1079                 ev_timer_start(event_base, &IO->conn_fail);
1080                 return IO->NextState;
1081         }
1082         else {
1083                 SetEVState(IO, eIOConnfail);
1084                 ev_idle_init(&IO->conn_fail_immediate,
1085                              IO_connfailimmediate_callback);
1086                 IO->conn_fail_immediate.data = IO;
1087                 ev_idle_start(event_base, &IO->conn_fail_immediate);
1088
1089                 EV_syslog(LOG_ERR,
1090                           "connect() = %d failed: %s\n",
1091                           IO->SendBuf.fd,
1092                           strerror(errno));
1093
1094                 StrBufPrintf(IO->ErrMsg,
1095                              "Failed to connect: %s",
1096                              strerror(errno));
1097                 return IO->NextState;
1098         }
1099         return IO->NextState;
1100 }
1101
1102 void SetNextTimeout(AsyncIO *IO, double timeout)
1103 {
1104         IO->rw_timeout.repeat = timeout;
1105         ev_timer_again (event_base,  &IO->rw_timeout);
1106 }
1107
1108
1109 eNextState ReAttachIO(AsyncIO *IO,
1110                       void *pData,
1111                       int ReadFirst)
1112 {
1113         SetEVState(IO, eIOAttach);
1114         IO->Data = pData;
1115         become_session(IO->CitContext);
1116         ev_cleanup_start(event_base, &IO->abort_by_shutdown);
1117         if (ReadFirst) {
1118                 IO->NextState = eReadMessage;
1119         }
1120         else {
1121                 IO->NextState = eSendReply;
1122         }
1123         set_start_callback(event_base, IO, 0);
1124
1125         return IO->NextState;
1126 }
1127
1128 void InitIOStruct(AsyncIO *IO,
1129                   void *Data,
1130                   eNextState NextState,
1131                   IO_LineReaderCallback LineReader,
1132                   IO_CallBack DNS_Fail,
1133                   IO_CallBack SendDone,
1134                   IO_CallBack ReadDone,
1135                   IO_CallBack Terminate,
1136                   IO_CallBack DBTerminate,
1137                   IO_CallBack ConnFail,
1138                   IO_CallBack Timeout,
1139                   IO_CallBack ShutdownAbort)
1140 {
1141         IO->Data          = Data;
1142
1143         IO->CitContext    = CloneContext(CC);
1144         IO->CitContext->session_specific_data = Data;
1145         IO->CitContext->IO = IO;
1146
1147         IO->NextState     = NextState;
1148
1149         IO->SendDone      = SendDone;
1150         IO->ReadDone      = ReadDone;
1151         IO->Terminate     = Terminate;
1152         IO->DBTerminate   = DBTerminate;
1153         IO->LineReader    = LineReader;
1154         IO->ConnFail      = ConnFail;
1155         IO->Timeout       = Timeout;
1156         IO->ShutdownAbort = ShutdownAbort;
1157
1158         IO->DNS.Fail      = DNS_Fail;
1159
1160         IO->SendBuf.Buf   = NewStrBufPlain(NULL, 1024);
1161         IO->RecvBuf.Buf   = NewStrBufPlain(NULL, 1024);
1162         IO->IOBuf         = NewStrBuf();
1163         EV_syslog(LOG_DEBUG,
1164                   "EVENT: Session lives at %p IO at %p \n",
1165                   Data, IO);
1166
1167 }
1168
1169 extern int evcurl_init(AsyncIO *IO);
1170
1171 int InitcURLIOStruct(AsyncIO *IO,
1172                      void *Data,
1173                      const char* Desc,
1174                      IO_CallBack SendDone,
1175                      IO_CallBack Terminate,
1176                      IO_CallBack DBTerminate,
1177                      IO_CallBack ShutdownAbort)
1178 {
1179         IO->Data          = Data;
1180
1181         IO->CitContext    = CloneContext(CC);
1182         IO->CitContext->session_specific_data = Data;
1183         IO->CitContext->IO = IO;
1184
1185         IO->SendDone      = SendDone;
1186         IO->Terminate     = Terminate;
1187         IO->DBTerminate   = DBTerminate;
1188         IO->ShutdownAbort = ShutdownAbort;
1189
1190         strcpy(IO->HttpReq.errdesc, Desc);
1191
1192
1193         return  evcurl_init(IO);
1194
1195 }
1196
1197
1198 typedef struct KillOtherSessionContext {
1199         AsyncIO IO;
1200         AsyncIO *OtherOne;
1201 }KillOtherSessionContext;
1202
1203 eNextState KillTerminate(AsyncIO *IO)
1204 {
1205         long id;
1206         KillOtherSessionContext *Ctx = (KillOtherSessionContext*)IO->Data;
1207         EV_syslog(LOG_DEBUG, "%s Exit\n", __FUNCTION__);
1208         id = IO->ID;
1209         FreeAsyncIOContents(IO);
1210         memset(Ctx, 0, sizeof(KillOtherSessionContext));
1211         IO->ID = id; /* just for the case we want to analyze it in a coredump */
1212         free(Ctx);
1213         return eAbort;
1214
1215 }
1216
1217 eNextState KillShutdown(AsyncIO *IO)
1218 {
1219         return eTerminateConnection;
1220 }
1221
1222 eNextState KillOtherContextNow(AsyncIO *IO)
1223 {
1224         KillOtherSessionContext *Ctx = IO->Data;
1225
1226         SetEVState(IO, eKill);
1227
1228         if (Ctx->OtherOne->ShutdownAbort != NULL)
1229                 Ctx->OtherOne->ShutdownAbort(Ctx->OtherOne);
1230         return eTerminateConnection;
1231 }
1232
1233 void KillAsyncIOContext(AsyncIO *IO)
1234 {
1235         KillOtherSessionContext *Ctx;
1236
1237         Ctx = (KillOtherSessionContext*) malloc(sizeof(KillOtherSessionContext));
1238         memset(Ctx, 0, sizeof(KillOtherSessionContext));
1239
1240         InitIOStruct(&Ctx->IO,
1241                      Ctx,
1242                      eReadMessage,
1243                      NULL,
1244                      NULL,
1245                      NULL,
1246                      NULL,
1247                      KillTerminate,
1248                      NULL,
1249                      NULL,
1250                      NULL,
1251                      KillShutdown);
1252
1253         Ctx->OtherOne = IO;
1254
1255         switch(IO->NextState) {
1256         case eSendDNSQuery:
1257         case eReadDNSReply:
1258
1259         case eConnect:
1260         case eSendReply:
1261         case eSendMore:
1262         case eSendFile:
1263
1264         case eReadMessage:
1265         case eReadMore:
1266         case eReadPayload:
1267         case eReadFile:
1268                 QueueEventContext(&Ctx->IO, KillOtherContextNow);
1269                 break;
1270         case eDBQuery:
1271                 QueueDBOperation(&Ctx->IO, KillOtherContextNow);
1272                 break;
1273         case eTerminateConnection:
1274         case eAbort:
1275                 /*hm, its already dying, dunno which Queue its in... */
1276                 free(Ctx);
1277         }
1278
1279 }
1280
1281 extern int DebugEventLoopBacktrace;
1282 void EV_backtrace(AsyncIO *IO)
1283 {
1284 #ifdef HAVE_BACKTRACE
1285         void *stack_frames[50];
1286         size_t size, i;
1287         char **strings;
1288
1289         if ((IO == NULL) || (DebugEventLoopBacktrace == 0))
1290                 return;
1291         size = backtrace(stack_frames, sizeof(stack_frames) / sizeof(void*));
1292         strings = backtrace_symbols(stack_frames, size);
1293         for (i = 0; i < size; i++) {
1294                 if (strings != NULL) {
1295                         EV_syslog(LOG_ALERT, " BT %s\n", strings[i]);
1296                 }
1297                 else {
1298                         EV_syslog(LOG_ALERT, " BT %p\n", stack_frames[i]);
1299                 }
1300         }
1301         free(strings);
1302 #endif
1303 }
1304
1305
1306 ev_tstamp ctdl_ev_now (void)
1307 {
1308         return ev_now(event_base);
1309 }