citadel/event_client.c

   1 /*
   2  *
   3  * Copyright (c) 1998-2012 by the citadel.org team
   4  *
   5  *  This program is open source software; you can redistribute it and/or modify
   6  *  it under the terms of the GNU General Public License as published by
   7  *  the Free Software Foundation; either version 3 of the License, or
   8  *  (at your option) any later version.
   9  *
  10  *  This program is distributed in the hope that it will be useful,
  11  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  *  GNU General Public License for more details.
  14  *
  15  *  You should have received a copy of the GNU General Public License
  16  *  along with this program; if not, write to the Free Software
  17  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  18  */
  19
  20 #include "sysdep.h"
  21 #include <stdlib.h>
  22 #include <unistd.h>
  23 #include <stdio.h>
  24 #include <termios.h>
  25 #include <fcntl.h>
  26 #include <signal.h>
  27 #include <pwd.h>
  28 #include <errno.h>
  29 #include <sys/types.h>
  30 #include <syslog.h>
  31
  32 #if TIME_WITH_SYS_TIME
  33 # include <sys/time.h>
  34 # include <time.h>
  35 #else
  36 # if HAVE_SYS_TIME_H
  37 #  include <sys/time.h>
  38 # else
  39 #  include <time.h>
  40 # endif
  41 #endif
  42 #include <sys/wait.h>
  43 #include <ctype.h>
  44 #include <string.h>
  45 #include <limits.h>
  46 #include <sys/socket.h>
  47 #include <netinet/in.h>
  48 #include <arpa/inet.h>
  49 #include <assert.h>
  50 #if HAVE_BACKTRACE
  51 #include <execinfo.h>
  52 #endif
  53
  54 #include <libcitadel.h>
  55 #include "citadel.h"
  56 #include "server.h"
  57 #include "citserver.h"
  58 #include "support.h"
  59 #include "config.h"
  60 #include "control.h"
  61 #include "user_ops.h"
  62 #include "database.h"
  63 #include "msgbase.h"
  64 #include "internet_addressing.h"
  65 #include "genstamp.h"
  66 #include "domain.h"
  67 #include "clientsocket.h"
  68 #include "locate_host.h"
  69 #include "citadel_dirs.h"
  70
  71 #include "event_client.h"
  72 #include "ctdl_module.h"
  73
  74 static void IO_Timeout_callback(struct ev_loop *loop, ev_timer *watcher, int revents);
  75 static void IO_abort_shutdown_callback(struct ev_loop *loop,
  76                                        ev_cleanup *watcher,
  77                                        int revents);
  78
  79
  80 /*------------------------------------------------------------------------------
  81  *                              Server DB IO
  82  *----------------------------------------------------------------------------*/
  83 extern int evdb_count;
  84 extern pthread_mutex_t DBEventQueueMutex;
  85 extern pthread_mutex_t DBEventExitQueueMutex;
  86 extern HashList *DBInboundEventQueue;
  87 extern struct ev_loop *event_db;
  88 extern ev_async DBAddJob;
  89 extern ev_async DBExitEventLoop;
  90
  91 eNextState QueueDBOperation(AsyncIO *IO, IO_CallBack CB)
  92 {
  93         IOAddHandler *h;
  94         int i;
  95
  96         h = (IOAddHandler*)malloc(sizeof(IOAddHandler));
  97         h->IO = IO;
  98         h->EvAttch = CB;
  99         ev_cleanup_init(&IO->db_abort_by_shutdown,
 100                         IO_abort_shutdown_callback);
 101         IO->db_abort_by_shutdown.data = IO;
 102
 103         pthread_mutex_lock(&DBEventQueueMutex);
 104         if (DBInboundEventQueue == NULL)
 105         {
 106                 /* shutting down... */
 107                 free(h);
 108                 EVM_syslog(LOG_DEBUG, "DBEVENT Q exiting.\n");
 109                 pthread_mutex_unlock(&DBEventQueueMutex);
 110                 return eAbort;
 111         }
 112         EVM_syslog(LOG_DEBUG, "DBEVENT Q\n");
 113         i = ++evdb_count ;
 114         Put(DBInboundEventQueue, IKEY(i), h, NULL);
 115         pthread_mutex_unlock(&DBEventQueueMutex);
 116
 117         pthread_mutex_lock(&DBEventExitQueueMutex);
 118         if (event_db == NULL)
 119         {
 120                 pthread_mutex_unlock(&DBEventExitQueueMutex);
 121                 return eAbort;
 122         }
 123         ev_async_send (event_db, &DBAddJob);
 124         pthread_mutex_unlock(&DBEventExitQueueMutex);
 125
 126         EVM_syslog(LOG_DEBUG, "DBEVENT Q Done.\n");
 127         return eDBQuery;
 128 }
 129
 130 void StopDBWatchers(AsyncIO *IO)
 131 {
 132         ev_cleanup_stop(event_db, &IO->db_abort_by_shutdown);
 133         ev_idle_stop(event_db, &IO->db_unwind_stack);
 134 }
 135
 136 void ShutDownDBCLient(AsyncIO *IO)
 137 {
 138         CitContext *Ctx =IO->CitContext;
 139         become_session(Ctx);
 140
 141         EVM_syslog(LOG_DEBUG, "DBEVENT Terminating.\n");
 142         StopDBWatchers(IO);
 143
 144         assert(IO->DBTerminate);
 145         IO->DBTerminate(IO);
 146 }
 147
 148 void
 149 DB_PerformNext(struct ev_loop *loop, ev_idle *watcher, int revents)
 150 {
 151         AsyncIO *IO = watcher->data;
 152         IO->Now = ev_now(event_db);
 153         EV_syslog(LOG_DEBUG, "%s()", __FUNCTION__);
 154         become_session(IO->CitContext);
 155
 156         ev_idle_stop(event_db, &IO->db_unwind_stack);
 157
 158         assert(IO->NextDBOperation);
 159         switch (IO->NextDBOperation(IO))
 160         {
 161         case eDBQuery:
 162                 break;
 163         case eSendDNSQuery:
 164         case eReadDNSReply:
 165         case eConnect:
 166         case eSendReply:
 167         case eSendMore:
 168         case eSendFile:
 169         case eReadMessage:
 170         case eReadMore:
 171         case eReadPayload:
 172         case eReadFile:
 173                 ev_cleanup_stop(loop, &IO->db_abort_by_shutdown);
 174                 break;
 175         case eTerminateConnection:
 176         case eAbort:
 177                 ev_idle_stop(event_db, &IO->db_unwind_stack);
 178                 ev_cleanup_stop(loop, &IO->db_abort_by_shutdown);
 179                 ShutDownDBCLient(IO);
 180         }
 181 }
 182
 183 eNextState NextDBOperation(AsyncIO *IO, IO_CallBack CB)
 184 {
 185         IO->NextDBOperation = CB;
 186         ev_idle_init(&IO->db_unwind_stack,
 187                      DB_PerformNext);
 188         IO->db_unwind_stack.data = IO;
 189         ev_idle_start(event_db, &IO->db_unwind_stack);
 190         return eDBQuery;
 191 }
 192
 193 /*------------------------------------------------------------------------------
 194  *                      Client IO
 195  *----------------------------------------------------------------------------*/
 196 extern int evbase_count;
 197 extern pthread_mutex_t EventQueueMutex;
 198 extern pthread_mutex_t EventExitQueueMutex;
 199 extern HashList *InboundEventQueue;
 200 extern struct ev_loop *event_base;
 201 extern ev_async AddJob;
 202 extern ev_async ExitEventLoop;
 203
 204 static void IO_abort_shutdown_callback(struct ev_loop *loop,
 205                                        ev_cleanup *watcher,
 206                                        int revents)
 207 {
 208         AsyncIO *IO = watcher->data;
 209         EV_syslog(LOG_DEBUG, "EVENT Q: %s\n", __FUNCTION__);
 210         IO->Now = ev_now(event_base);
 211         assert(IO->ShutdownAbort);
 212         IO->ShutdownAbort(IO);
 213 }
 214
 215
 216 eNextState QueueEventContext(AsyncIO *IO, IO_CallBack CB)
 217 {
 218         IOAddHandler *h;
 219         int i;
 220
 221         h = (IOAddHandler*)malloc(sizeof(IOAddHandler));
 222         h->IO = IO;
 223         h->EvAttch = CB;
 224         ev_cleanup_init(&IO->abort_by_shutdown,
 225                         IO_abort_shutdown_callback);
 226         IO->abort_by_shutdown.data = IO;
 227
 228         pthread_mutex_lock(&EventQueueMutex);
 229         if (InboundEventQueue == NULL)
 230         {
 231                 free(h);
 232                 /* shutting down... */
 233                 EVM_syslog(LOG_DEBUG, "EVENT Q exiting.\n");
 234                 pthread_mutex_unlock(&EventQueueMutex);
 235                 return eAbort;
 236         }
 237         EVM_syslog(LOG_DEBUG, "EVENT Q\n");
 238         i = ++evbase_count;
 239         Put(InboundEventQueue, IKEY(i), h, NULL);
 240         pthread_mutex_unlock(&EventQueueMutex);
 241
 242         pthread_mutex_lock(&EventExitQueueMutex);
 243         if (event_base == NULL) {
 244                 pthread_mutex_unlock(&EventExitQueueMutex);
 245                 return eAbort;
 246         }
 247         ev_async_send (event_base, &AddJob);
 248         pthread_mutex_unlock(&EventExitQueueMutex);
 249         EVM_syslog(LOG_DEBUG, "EVENT Q Done.\n");
 250         return eSendReply;
 251 }
 252
 253 extern eNextState evcurl_handle_start(AsyncIO *IO);
 254
 255 eNextState QueueCurlContext(AsyncIO *IO)
 256 {
 257         IOAddHandler *h;
 258         int i;
 259
 260         h = (IOAddHandler*)malloc(sizeof(IOAddHandler));
 261         h->IO = IO;
 262         h->EvAttch = evcurl_handle_start;
 263
 264         pthread_mutex_lock(&EventQueueMutex);
 265         if (InboundEventQueue == NULL)
 266         {
 267                 /* shutting down... */
 268                 free(h);
 269                 EVM_syslog(LOG_DEBUG, "EVENT Q exiting.\n");
 270                 pthread_mutex_unlock(&EventQueueMutex);
 271                 return eAbort;
 272         }
 273
 274         EVM_syslog(LOG_DEBUG, "EVENT Q\n");
 275         i = ++evbase_count;
 276         Put(InboundEventQueue, IKEY(i), h, NULL);
 277         pthread_mutex_unlock(&EventQueueMutex);
 278
 279         pthread_mutex_lock(&EventExitQueueMutex);
 280         if (event_base == NULL) {
 281                 pthread_mutex_unlock(&EventExitQueueMutex);
 282                 return eAbort;
 283         }
 284         ev_async_send (event_base, &AddJob);
 285         pthread_mutex_unlock(&EventExitQueueMutex);
 286
 287         EVM_syslog(LOG_DEBUG, "EVENT Q Done.\n");
 288         return eSendReply;
 289 }
 290
 291 void DestructCAres(AsyncIO *IO);
 292 void FreeAsyncIOContents(AsyncIO *IO)
 293 {
 294         CitContext *Ctx = IO->CitContext;
 295
 296         FreeStrBuf(&IO->IOBuf);
 297         FreeStrBuf(&IO->SendBuf.Buf);
 298         FreeStrBuf(&IO->RecvBuf.Buf);
 299
 300         DestructCAres(IO);
 301
 302         FreeURL(&IO->ConnectMe);
 303         FreeStrBuf(&IO->HttpReq.ReplyData);
 304
 305         if (Ctx) {
 306                 Ctx->state = CON_IDLE;
 307                 Ctx->kill_me = 1;
 308         }
 309 }
 310
 311
 312 void StopClientWatchers(AsyncIO *IO)
 313 {
 314         ev_timer_stop (event_base, &IO->rw_timeout);
 315         ev_timer_stop(event_base, &IO->conn_fail);
 316         ev_idle_stop(event_base, &IO->unwind_stack);
 317         ev_cleanup_stop(event_base, &IO->abort_by_shutdown);
 318
 319         ev_io_stop(event_base, &IO->conn_event);
 320         ev_io_stop(event_base, &IO->send_event);
 321         ev_io_stop(event_base, &IO->recv_event);
 322
 323         if (IO->SendBuf.fd != 0) {
 324                 close(IO->SendBuf.fd);
 325         }
 326         IO->SendBuf.fd = 0;
 327         IO->RecvBuf.fd = 0;
 328 }
 329
 330 void StopCurlWatchers(AsyncIO *IO)
 331 {
 332         ev_timer_stop (event_base, &IO->rw_timeout);
 333         ev_timer_stop(event_base, &IO->conn_fail);
 334         ev_idle_stop(event_base, &IO->unwind_stack);
 335         ev_cleanup_stop(event_base, &IO->abort_by_shutdown);
 336
 337         ev_io_stop(event_base, &IO->conn_event);
 338         ev_io_stop(event_base, &IO->send_event);
 339         ev_io_stop(event_base, &IO->recv_event);
 340
 341         if (IO->SendBuf.fd != 0) {
 342                 close(IO->SendBuf.fd);
 343         }
 344         IO->SendBuf.fd = 0;
 345         IO->RecvBuf.fd = 0;
 346 }
 347
 348 void ShutDownCLient(AsyncIO *IO)
 349 {
 350         CitContext *Ctx =IO->CitContext;
 351         become_session(Ctx);
 352
 353         EVM_syslog(LOG_DEBUG, "EVENT Terminating \n");
 354
 355         StopClientWatchers(IO);
 356
 357         if (IO->DNS.Channel != NULL) {
 358                 ares_destroy(IO->DNS.Channel);
 359                 EV_DNS_LOG_STOP(DNS.recv_event);
 360                 EV_DNS_LOG_STOP(DNS.send_event);
 361                 ev_io_stop(event_base, &IO->DNS.recv_event);
 362                 ev_io_stop(event_base, &IO->DNS.send_event);
 363                 IO->DNS.Channel = NULL;
 364         }
 365         assert(IO->Terminate);
 366         IO->Terminate(IO);
 367 }
 368
 369 void PostInbound(AsyncIO *IO)
 370 {
 371         switch (IO->NextState) {
 372         case eSendFile:
 373                 ev_io_start(event_base, &IO->send_event);
 374                 break;
 375         case eSendReply:
 376         case eSendMore:
 377                 assert(IO->SendDone);
 378                 IO->NextState = IO->SendDone(IO);
 379                 ev_io_start(event_base, &IO->send_event);
 380                 break;
 381         case eReadPayload:
 382         case eReadMore:
 383         case eReadFile:
 384                 ev_io_start(event_base, &IO->recv_event);
 385                 break;
 386         case eTerminateConnection:
 387                 ShutDownCLient(IO);
 388                 break;
 389         case eAbort:
 390                 ShutDownCLient(IO);
 391                 break;
 392         case eSendDNSQuery:
 393         case eReadDNSReply:
 394         case eDBQuery:
 395         case eConnect:
 396         case eReadMessage:
 397                 break;
 398         }
 399 }
 400 eReadState HandleInbound(AsyncIO *IO)
 401 {
 402         const char *Err = NULL;
 403         eReadState Finished = eBufferNotEmpty;
 404
 405         become_session(IO->CitContext);
 406
 407         while ((Finished == eBufferNotEmpty) &&
 408                ((IO->NextState == eReadMessage)||
 409                 (IO->NextState == eReadMore)||
 410                 (IO->NextState == eReadFile)||
 411                 (IO->NextState == eReadPayload)))
 412         {
 413                 /* Reading lines...
 414                  * lex line reply in callback,
 415                  * or do it ourselves.
 416                  * i.e. as nnn-blabla means continue reading in SMTP
 417                  */
 418                 if ((IO->NextState == eReadFile) &&
 419                     (Finished == eBufferNotEmpty))
 420                 {
 421                         Finished = WriteIOBAlreadyRead(&IO->IOB, &Err);
 422                         if (Finished == eReadSuccess)
 423                         {
 424                                 IO->NextState = eSendReply;
 425                         }
 426                 }
 427                 else if (IO->LineReader)
 428                         Finished = IO->LineReader(IO);
 429                 else
 430                         Finished = StrBufChunkSipLine(IO->IOBuf,
 431                                                       &IO->RecvBuf);
 432
 433                 switch (Finished) {
 434                 case eMustReadMore: /// read new from socket...
 435                         break;
 436                 case eBufferNotEmpty: /* shouldn't happen... */
 437                 case eReadSuccess: /// done for now...
 438                         break;
 439                 case eReadFail: /// WHUT?
 440                                 ///todo: shut down!
 441                         break;
 442                 }
 443
 444                 if (Finished != eMustReadMore) {
 445                         assert(IO->ReadDone);
 446                         ev_io_stop(event_base, &IO->recv_event);
 447                         IO->NextState = IO->ReadDone(IO);
 448                         Finished = StrBufCheckBuffer(&IO->RecvBuf);
 449                 }
 450         }
 451
 452         PostInbound(IO);
 453
 454         return Finished;
 455 }
 456
 457
 458 static void
 459 IO_send_callback(struct ev_loop *loop, ev_io *watcher, int revents)
 460 {
 461         int rc;
 462         AsyncIO *IO = watcher->data;
 463         const char *errmsg = NULL;
 464
 465         IO->Now = ev_now(event_base);
 466         become_session(IO->CitContext);
 467 #ifdef BIGBAD_IODBG
 468         {
 469                 int rv = 0;
 470                 char fn [SIZ];
 471                 FILE *fd;
 472                 const char *pch = ChrPtr(IO->SendBuf.Buf);
 473                 const char *pchh = IO->SendBuf.ReadWritePointer;
 474                 long nbytes;
 475
 476                 if (pchh == NULL)
 477                         pchh = pch;
 478
 479                 nbytes = StrLength(IO->SendBuf.Buf) - (pchh - pch);
 480                 snprintf(fn, SIZ, "/tmp/foolog_ev_%s.%d",
 481                          ((CitContext*)(IO->CitContext))->ServiceName,
 482                          IO->SendBuf.fd);
 483
 484                 fd = fopen(fn, "a+");
 485                 fprintf(fd, "Send: BufSize: %ld BufContent: [",
 486                         nbytes);
 487                 rv = fwrite(pchh, nbytes, 1, fd);
 488                 if (!rv) printf("failed to write debug to %s!\n", fn);
 489                 fprintf(fd, "]\n");
 490 #endif
 491                 switch (IO->NextState) {
 492                 case eSendFile:
 493                         rc = FileSendChunked(&IO->IOB, &errmsg);
 494                         if (rc < 0)
 495                                 StrBufPlain(IO->ErrMsg, errmsg, -1);
 496                         break;
 497                 default:
 498                         rc = StrBuf_write_one_chunk_callback(watcher->fd,
 499                                                              0/*TODO*/,
 500                                                              &IO->SendBuf);
 501                 }
 502
 503 #ifdef BIGBAD_IODBG
 504                 fprintf(fd, "Sent: BufSize: %d bytes.\n", rc);
 505                 fclose(fd);
 506         }
 507 #endif
 508         if (rc == 0)
 509         {
 510                 ev_io_stop(event_base, &IO->send_event);
 511                 switch (IO->NextState) {
 512                 case eSendMore:
 513                         assert(IO->SendDone);
 514                         IO->NextState = IO->SendDone(IO);
 515
 516                         if ((IO->NextState == eTerminateConnection) ||
 517                             (IO->NextState == eAbort) )
 518                                 ShutDownCLient(IO);
 519                         else {
 520                                 ev_io_start(event_base, &IO->send_event);
 521                         }
 522                         break;
 523                 case eSendFile:
 524                         if (IO->IOB.ChunkSendRemain > 0) {
 525                                 ev_io_start(event_base, &IO->recv_event);
 526                                 SetNextTimeout(IO, 100.0);
 527
 528                         } else {
 529                                 assert(IO->ReadDone);
 530                                 IO->NextState = IO->ReadDone(IO);
 531                                 switch(IO->NextState) {
 532                                 case eSendDNSQuery:
 533                                 case eReadDNSReply:
 534                                 case eDBQuery:
 535                                 case eConnect:
 536                                         break;
 537                                 case eSendReply:
 538                                 case eSendMore:
 539                                 case eSendFile:
 540                                         ev_io_start(event_base,
 541                                                     &IO->send_event);
 542                                         break;
 543                                 case eReadMessage:
 544                                 case eReadMore:
 545                                 case eReadPayload:
 546                                 case eReadFile:
 547                                         break;
 548                                 case eTerminateConnection:
 549                                 case eAbort:
 550                                         break;
 551                                 }
 552                         }
 553                         break;
 554                 case eSendReply:
 555                     if (StrBufCheckBuffer(&IO->SendBuf) != eReadSuccess)
 556                         break;
 557                     IO->NextState = eReadMore;
 558                 case eReadMore:
 559                 case eReadMessage:
 560                 case eReadPayload:
 561                 case eReadFile:
 562                         if (StrBufCheckBuffer(&IO->RecvBuf) == eBufferNotEmpty)
 563                         {
 564                                 HandleInbound(IO);
 565                         }
 566                         else {
 567                                 ev_io_start(event_base, &IO->recv_event);
 568                         }
 569
 570                         break;
 571                 case eDBQuery:
 572                         /*
 573                          * we now live in another queue,
 574                          * so we have to unregister.
 575                          */
 576                         ev_cleanup_stop(loop, &IO->abort_by_shutdown);
 577                         break;
 578                 case eSendDNSQuery:
 579                 case eReadDNSReply:
 580                 case eConnect:
 581                 case eTerminateConnection:
 582                 case eAbort:
 583                         break;
 584                 }
 585         }
 586         else if (rc < 0) {
 587                 IO_Timeout_callback(loop, &IO->rw_timeout, revents);
 588         }
 589         /* else : must write more. */
 590 }
 591 static void
 592 set_start_callback(struct ev_loop *loop, AsyncIO *IO, int revents)
 593 {
 594         switch(IO->NextState) {
 595         case eReadMore:
 596         case eReadMessage:
 597         case eReadFile:
 598                 ev_io_start(event_base, &IO->recv_event);
 599                 break;
 600         case eSendReply:
 601         case eSendMore:
 602         case eReadPayload:
 603         case eSendFile:
 604                 become_session(IO->CitContext);
 605                 IO_send_callback(loop, &IO->send_event, revents);
 606                 break;
 607         case eDBQuery:
 608         case eSendDNSQuery:
 609         case eReadDNSReply:
 610         case eConnect:
 611         case eTerminateConnection:
 612         case eAbort:
 613                 /// TODO: WHUT?
 614                 break;
 615         }
 616 }
 617
 618 static void
 619 IO_Timeout_callback(struct ev_loop *loop, ev_timer *watcher, int revents)
 620 {
 621         AsyncIO *IO = watcher->data;
 622
 623         IO->Now = ev_now(event_base);
 624         ev_timer_stop (event_base, &IO->rw_timeout);
 625         become_session(IO->CitContext);
 626
 627         if (IO->SendBuf.fd != 0)
 628         {
 629                 ev_io_stop(event_base, &IO->send_event);
 630                 ev_io_stop(event_base, &IO->recv_event);
 631                 ev_timer_stop (event_base, &IO->rw_timeout);
 632                 close(IO->SendBuf.fd);
 633                 IO->SendBuf.fd = IO->RecvBuf.fd = 0;
 634         }
 635
 636         assert(IO->Timeout);
 637         switch (IO->Timeout(IO))
 638         {
 639         case eAbort:
 640                 ShutDownCLient(IO);
 641         default:
 642                 break;
 643         }
 644 }
 645
 646 static void
 647 IO_connfail_callback(struct ev_loop *loop, ev_timer *watcher, int revents)
 648 {
 649         AsyncIO *IO = watcher->data;
 650
 651         IO->Now = ev_now(event_base);
 652         ev_timer_stop (event_base, &IO->conn_fail);
 653
 654         if (IO->SendBuf.fd != 0)
 655         {
 656                 ev_io_stop(loop, &IO->conn_event);
 657                 ev_io_stop(event_base, &IO->send_event);
 658                 ev_io_stop(event_base, &IO->recv_event);
 659                 ev_timer_stop (event_base, &IO->rw_timeout);
 660                 close(IO->SendBuf.fd);
 661                 IO->SendBuf.fd = IO->RecvBuf.fd = 0;
 662         }
 663         become_session(IO->CitContext);
 664
 665         assert(IO->ConnFail);
 666         switch (IO->ConnFail(IO))
 667         {
 668         case eAbort:
 669                 ShutDownCLient(IO);
 670         default:
 671                 break;
 672
 673         }
 674 }
 675
 676 static void
 677 IO_connfailimmediate_callback(struct ev_loop *loop,
 678                               ev_idle *watcher,
 679                               int revents)
 680 {
 681         AsyncIO *IO = watcher->data;
 682
 683         IO->Now = ev_now(event_base);
 684         ev_idle_stop (event_base, &IO->conn_fail_immediate);
 685
 686         if (IO->SendBuf.fd != 0)
 687         {
 688                 close(IO->SendBuf.fd);
 689                 IO->SendBuf.fd = IO->RecvBuf.fd = 0;
 690         }
 691         become_session(IO->CitContext);
 692
 693         assert(IO->ConnFail);
 694         switch (IO->ConnFail(IO))
 695         {
 696         case eAbort:
 697                 ShutDownCLient(IO);
 698         default:
 699                 break;
 700
 701         }
 702 }
 703
 704 static void
 705 IO_connestd_callback(struct ev_loop *loop, ev_io *watcher, int revents)
 706 {
 707         AsyncIO *IO = watcher->data;
 708
 709         IO->Now = ev_now(event_base);
 710         EVM_syslog(LOG_DEBUG, "connect() succeeded.\n");
 711
 712         ev_io_stop(loop, &IO->conn_event);
 713         ev_timer_stop (event_base, &IO->conn_fail);
 714         set_start_callback(loop, IO, revents);
 715 }
 716 static void
 717 IO_recv_callback(struct ev_loop *loop, ev_io *watcher, int revents)
 718 {
 719         const char *errmsg;
 720         ssize_t nbytes;
 721         AsyncIO *IO = watcher->data;
 722
 723         IO->Now = ev_now(event_base);
 724         switch (IO->NextState) {
 725         case eReadFile:
 726                 nbytes = FileRecvChunked(&IO->IOB, &errmsg);
 727                 if (nbytes < 0)
 728                         StrBufPlain(IO->ErrMsg, errmsg, -1);
 729                 else
 730                 {
 731                         if (IO->IOB.ChunkSendRemain == 0)
 732                         {
 733                                 IO->NextState = eSendReply;
 734                                 assert(IO->ReadDone);
 735                                 ev_io_stop(event_base, &IO->recv_event);
 736                                 PostInbound(IO);
 737                                 return;
 738                         }
 739                         else
 740                                 return;
 741                 }
 742                 break;
 743         default:
 744                 nbytes = StrBuf_read_one_chunk_callback(watcher->fd,
 745                                                         0 /*TODO */,
 746                                                         &IO->RecvBuf);
 747                 break;
 748         }
 749
 750 #ifdef BIGBAD_IODBG
 751         {
 752                 long nbytes;
 753                 int rv = 0;
 754                 char fn [SIZ];
 755                 FILE *fd;
 756                 const char *pch = ChrPtr(IO->RecvBuf.Buf);
 757                 const char *pchh = IO->RecvBuf.ReadWritePointer;
 758
 759                 if (pchh == NULL)
 760                         pchh = pch;
 761
 762                 nbytes = StrLength(IO->RecvBuf.Buf) - (pchh - pch);
 763                 snprintf(fn, SIZ, "/tmp/foolog_ev_%s.%d",
 764                          ((CitContext*)(IO->CitContext))->ServiceName,
 765                          IO->SendBuf.fd);
 766
 767                 fd = fopen(fn, "a+");
 768                 fprintf(fd, "Read: BufSize: %ld BufContent: [",
 769                         nbytes);
 770                 rv = fwrite(pchh, nbytes, 1, fd);
 771                 if (!rv) printf("failed to write debug to %s!\n", fn);
 772                 fprintf(fd, "]\n");
 773                 fclose(fd);
 774         }
 775 #endif
 776         if (nbytes > 0) {
 777                 HandleInbound(IO);
 778         } else if (nbytes == 0) {
 779                 IO_Timeout_callback(loop, &IO->rw_timeout, revents);
 780                 return;
 781         } else if (nbytes == -1) {
 782                 // FD is gone. kick it.
 783                 StopClientWatchers(IO);
 784                 EV_syslog(LOG_DEBUG,
 785                           "EVENT: Socket Invalid! %s \n",
 786                           strerror(errno));
 787                 ShutDownCLient(IO);
 788                 return;
 789         }
 790 }
 791
 792 void
 793 IO_postdns_callback(struct ev_loop *loop, ev_idle *watcher, int revents)
 794 {
 795         AsyncIO *IO = watcher->data;
 796         IO->Now = ev_now(event_base);
 797         EV_syslog(LOG_DEBUG, "event: %s\n", __FUNCTION__);
 798         become_session(IO->CitContext);
 799         assert(IO->DNS.Query->PostDNS);
 800         switch (IO->DNS.Query->PostDNS(IO))
 801         {
 802         case eAbort:
 803                 assert(IO->DNS.Fail);
 804                 switch (IO->DNS.Fail(IO)) {
 805                 case eAbort:
 806 ////                    StopClientWatchers(IO);
 807                         ShutDownCLient(IO);
 808                 default:
 809                         break;
 810                 }
 811         default:
 812                 break;
 813         }
 814 }
 815
 816
 817 eNextState EvConnectSock(AsyncIO *IO,
 818                          double conn_timeout,
 819                          double first_rw_timeout,
 820                          int ReadFirst)
 821 {
 822         struct sockaddr_in egress_sin;
 823         int fdflags;
 824         int rc = -1;
 825
 826         become_session(IO->CitContext);
 827
 828         if (ReadFirst) {
 829                 IO->NextState = eReadMessage;
 830         }
 831         else {
 832                 IO->NextState = eSendReply;
 833         }
 834
 835         IO->SendBuf.fd = IO->RecvBuf.fd =
 836                 socket(
 837                         (IO->ConnectMe->IPv6)?PF_INET6:PF_INET,
 838                         SOCK_STREAM,
 839                         IPPROTO_TCP);
 840
 841         if (IO->SendBuf.fd < 0) {
 842                 EV_syslog(LOG_ERR,
 843                           "EVENT: socket() failed: %s\n",
 844                           strerror(errno));
 845
 846                 StrBufPrintf(IO->ErrMsg,
 847                              "Failed to create socket: %s",
 848                              strerror(errno));
 849                 IO->SendBuf.fd = IO->RecvBuf.fd = 0;
 850                 return eAbort;
 851         }
 852         fdflags = fcntl(IO->SendBuf.fd, F_GETFL);
 853         if (fdflags < 0) {
 854                 EV_syslog(LOG_ERR,
 855                           "EVENT: unable to get socket flags! %s \n",
 856                           strerror(errno));
 857                 StrBufPrintf(IO->ErrMsg,
 858                              "Failed to get socket flags: %s",
 859                              strerror(errno));
 860                 close(IO->SendBuf.fd);
 861                 IO->SendBuf.fd = IO->RecvBuf.fd = 0;
 862                 return eAbort;
 863         }
 864         fdflags = fdflags | O_NONBLOCK;
 865         if (fcntl(IO->SendBuf.fd, F_SETFL, fdflags) < 0) {
 866                 EV_syslog(
 867                         LOG_ERR,
 868                         "EVENT: unable to set socket nonblocking flags! %s \n",
 869                         strerror(errno));
 870                 StrBufPrintf(IO->ErrMsg,
 871                              "Failed to set socket flags: %s",
 872                              strerror(errno));
 873                 close(IO->SendBuf.fd);
 874                 IO->SendBuf.fd = IO->RecvBuf.fd = 0;
 875                 return eAbort;
 876         }
 877 /* TODO: maye we could use offsetof() to calc the position of data...
 878  * http://doc.dvgu.ru/devel/ev.html#associating_custom_data_with_a_watcher
 879  */
 880         ev_io_init(&IO->recv_event, IO_recv_callback, IO->RecvBuf.fd, EV_READ);
 881         IO->recv_event.data = IO;
 882         ev_io_init(&IO->send_event, IO_send_callback, IO->SendBuf.fd, EV_WRITE);
 883         IO->send_event.data = IO;
 884
 885         ev_timer_init(&IO->conn_fail, IO_connfail_callback, conn_timeout, 0);
 886         IO->conn_fail.data = IO;
 887         ev_timer_init(&IO->rw_timeout, IO_Timeout_callback, first_rw_timeout,0);
 888         IO->rw_timeout.data = IO;
 889
 890
 891
 892
 893         /* for debugging you may bypass it like this:
 894          * IO->Addr.sin_addr.s_addr = inet_addr("127.0.0.1");
 895          * ((struct sockaddr_in)IO->ConnectMe->Addr).sin_addr.s_addr =
 896          *   inet_addr("127.0.0.1");
 897          */
 898         if (IO->ConnectMe->IPv6) {
 899                 rc = connect(IO->SendBuf.fd,
 900                              &IO->ConnectMe->Addr,
 901                              sizeof(struct sockaddr_in6));
 902         }
 903         else {
 904                 /* If citserver is bound to a specific IP address on the host, make
 905                  * sure we use that address for outbound connections.
 906                  */
 907
 908                 memset(&egress_sin, 0, sizeof(egress_sin));
 909                 egress_sin.sin_family = AF_INET;
 910                 if (!IsEmptyStr(config.c_ip_addr)) {
 911                         egress_sin.sin_addr.s_addr = inet_addr(config.c_ip_addr);
 912                         if (egress_sin.sin_addr.s_addr == !INADDR_ANY) {
 913                                 egress_sin.sin_addr.s_addr = INADDR_ANY;
 914                         }
 915
 916                         /* If this bind fails, no problem; we can still use INADDR_ANY */
 917                         bind(IO->SendBuf.fd, (struct sockaddr *)&egress_sin, sizeof(egress_sin));
 918                 }
 919                 rc = connect(IO->SendBuf.fd,
 920                              (struct sockaddr_in *)&IO->ConnectMe->Addr,
 921                              sizeof(struct sockaddr_in));
 922         }
 923
 924         if (rc >= 0){
 925                 EVM_syslog(LOG_DEBUG, "connect() immediate success.\n");
 926                 set_start_callback(event_base, IO, 0);
 927                 ev_timer_start(event_base, &IO->rw_timeout);
 928                 return IO->NextState;
 929         }
 930         else if (errno == EINPROGRESS) {
 931                 EVM_syslog(LOG_DEBUG, "connect() have to wait now.\n");
 932
 933                 ev_io_init(&IO->conn_event,
 934                            IO_connestd_callback,
 935                            IO->SendBuf.fd,
 936                            EV_READ|EV_WRITE);
 937
 938                 IO->conn_event.data = IO;
 939
 940                 ev_io_start(event_base, &IO->conn_event);
 941                 ev_timer_start(event_base, &IO->conn_fail);
 942                 return IO->NextState;
 943         }
 944         else {
 945                 ev_idle_init(&IO->conn_fail_immediate,
 946                              IO_connfailimmediate_callback);
 947                 IO->conn_fail_immediate.data = IO;
 948                 ev_idle_start(event_base, &IO->conn_fail_immediate);
 949
 950                 EV_syslog(LOG_ERR, "connect() failed: %s\n", strerror(errno));
 951                 StrBufPrintf(IO->ErrMsg,
 952                              "Failed to connect: %s",
 953                              strerror(errno));
 954                 return IO->NextState;
 955         }
 956         return IO->NextState;
 957 }
 958
 959 void SetNextTimeout(AsyncIO *IO, double timeout)
 960 {
 961         IO->rw_timeout.repeat = timeout;
 962         ev_timer_again (event_base,  &IO->rw_timeout);
 963 }
 964
 965
 966 eNextState ReAttachIO(AsyncIO *IO,
 967                       void *pData,
 968                       int ReadFirst)
 969 {
 970         IO->Data = pData;
 971         become_session(IO->CitContext);
 972         ev_cleanup_start(event_base, &IO->abort_by_shutdown);
 973         if (ReadFirst) {
 974                 IO->NextState = eReadMessage;
 975         }
 976         else {
 977                 IO->NextState = eSendReply;
 978         }
 979         set_start_callback(event_base, IO, 0);
 980
 981         return IO->NextState;
 982 }
 983
 984 void InitIOStruct(AsyncIO *IO,
 985                   void *Data,
 986                   eNextState NextState,
 987                   IO_LineReaderCallback LineReader,
 988                   IO_CallBack DNS_Fail,
 989                   IO_CallBack SendDone,
 990                   IO_CallBack ReadDone,
 991                   IO_CallBack Terminate,
 992                   IO_CallBack DBTerminate,
 993                   IO_CallBack ConnFail,
 994                   IO_CallBack Timeout,
 995                   IO_CallBack ShutdownAbort)
 996 {
 997         IO->Data          = Data;
 998
 999         IO->CitContext    = CloneContext(CC);
1000         ((CitContext *)IO->CitContext)->session_specific_data = (char*) Data;
1001
1002         IO->NextState     = NextState;
1003
1004         IO->SendDone      = SendDone;
1005         IO->ReadDone      = ReadDone;
1006         IO->Terminate     = Terminate;
1007         IO->DBTerminate   = DBTerminate;
1008         IO->LineReader    = LineReader;
1009         IO->ConnFail      = ConnFail;
1010         IO->Timeout       = Timeout;
1011         IO->ShutdownAbort = ShutdownAbort;
1012
1013         IO->DNS.Fail      = DNS_Fail;
1014
1015         IO->SendBuf.Buf   = NewStrBufPlain(NULL, 1024);
1016         IO->RecvBuf.Buf   = NewStrBufPlain(NULL, 1024);
1017         IO->IOBuf         = NewStrBuf();
1018         EV_syslog(LOG_DEBUG,
1019                   "EVENT: Session lives at %p IO at %p \n",
1020                   Data, IO);
1021
1022 }
1023
1024 extern int evcurl_init(AsyncIO *IO);
1025
1026 int InitcURLIOStruct(AsyncIO *IO,
1027                      void *Data,
1028                      const char* Desc,
1029                      IO_CallBack SendDone,
1030                      IO_CallBack Terminate,
1031                      IO_CallBack DBTerminate,
1032                      IO_CallBack ShutdownAbort)
1033 {
1034         IO->Data          = Data;
1035
1036         IO->CitContext    = CloneContext(CC);
1037         ((CitContext *)IO->CitContext)->session_specific_data = (char*) Data;
1038
1039         IO->SendDone      = SendDone;
1040         IO->Terminate     = Terminate;
1041         IO->DBTerminate   = DBTerminate;
1042         IO->ShutdownAbort = ShutdownAbort;
1043
1044         strcpy(IO->HttpReq.errdesc, Desc);
1045
1046
1047         return  evcurl_init(IO);
1048
1049 }
1050
1051 extern int DebugEventLoopBacktrace;
1052 void EV_backtrace(AsyncIO *IO)
1053 {
1054 #ifdef HAVE_BACKTRACE
1055         void *stack_frames[50];
1056         size_t size, i;
1057         char **strings;
1058
1059         if ((IO == NULL) || (DebugEventLoopBacktrace == 0))
1060                 return;
1061         size = backtrace(stack_frames, sizeof(stack_frames) / sizeof(void*));
1062         strings = backtrace_symbols(stack_frames, size);
1063         for (i = 0; i < size; i++) {
1064                 if (strings != NULL) {
1065                         EV_syslog(LOG_ALERT, " BT %s\n", strings[i]);
1066                 }
1067                 else {
1068                         EV_syslog(LOG_ALERT, " BT %p\n", stack_frames[i]);
1069                 }
1070         }
1071         free(strings);
1072 #endif
1073 }
1074
1075
1076 ev_tstamp ctdl_ev_now (void)
1077 {
1078         return ev_now(event_base);
1079 }