citadel/event_client.c

   1 /*
   2  *
   3  * Copyright (c) 1998-2009 by the citadel.org team
   4  *
   5  *  This program is free 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
  51 #include <libcitadel.h>
  52 #include "citadel.h"
  53 #include "server.h"
  54 #include "citserver.h"
  55 #include "support.h"
  56 #include "config.h"
  57 #include "control.h"
  58 #include "user_ops.h"
  59 #include "database.h"
  60 #include "msgbase.h"
  61 #include "internet_addressing.h"
  62 #include "genstamp.h"
  63 #include "domain.h"
  64 #include "clientsocket.h"
  65 #include "locate_host.h"
  66 #include "citadel_dirs.h"
  67
  68 #include "event_client.h"
  69
  70 static void IO_abort_shutdown_callback(struct ev_loop *loop, ev_cleanup *watcher, int revents)
  71 {
  72         CtdlLogPrintf(CTDL_DEBUG, "EVENT Q: %s\n", __FUNCTION__);
  73
  74         AsyncIO *IO = watcher->data;
  75         assert(IO->ShutdownAbort);
  76         IO->ShutdownAbort(IO);
  77 }
  78
  79
  80 /*--------------------------------------------------------------------------------
  81  * Server DB IO
  82  */
  83 extern int evdb_count;
  84 extern citthread_mutex_t DBEventQueueMutex;
  85 extern HashList *DBInboundEventQueue;
  86 extern struct ev_loop *event_db;
  87 extern ev_async DBAddJob;
  88 extern ev_async DBExitEventLoop;
  89
  90 int QueueDBOperation(AsyncIO *IO, IO_CallBack CB)
  91 {
  92         IOAddHandler *h;
  93         int i;
  94
  95         h = (IOAddHandler*)malloc(sizeof(IOAddHandler));
  96         h->IO = IO;
  97         h->EvAttch = CB;
  98         ev_cleanup_init(&IO->db_abort_by_shutdown,
  99                         IO_abort_shutdown_callback);
 100         IO->db_abort_by_shutdown.data = IO;
 101         ev_cleanup_start(event_db, &IO->db_abort_by_shutdown);
 102
 103         citthread_mutex_lock(&DBEventQueueMutex);
 104         CtdlLogPrintf(CTDL_DEBUG, "DBEVENT Q\n");
 105         i = ++evdb_count ;
 106         Put(DBInboundEventQueue, IKEY(i), h, NULL);
 107         citthread_mutex_unlock(&DBEventQueueMutex);
 108
 109         ev_async_send (event_db, &DBAddJob);
 110         CtdlLogPrintf(CTDL_DEBUG, "DBEVENT Q Done.\n");
 111         return 0;
 112 }
 113
 114 void ShutDownDBCLient(AsyncIO *IO)
 115 {
 116         CitContext *Ctx =IO->CitContext;
 117         become_session(Ctx);
 118
 119         CtdlLogPrintf(CTDL_DEBUG, "DBEVENT\n");
 120         ev_cleanup_stop(event_db, &IO->db_abort_by_shutdown);
 121
 122         assert(IO->Terminate);
 123         IO->Terminate(IO);
 124
 125         Ctx->state = CON_IDLE;
 126         Ctx->kill_me = 1;
 127 }
 128
 129 void
 130 DB_PerformNext(struct ev_loop *loop, ev_idle *watcher, int revents)
 131 {
 132         AsyncIO *IO = watcher->data;
 133         CtdlLogPrintf(CTDL_DEBUG, "event: %s\n", __FUNCTION__);
 134         become_session(IO->CitContext);
 135
 136         ev_idle_stop(event_db, &IO->db_unwind_stack);
 137
 138         assert(IO->NextDBOperation);
 139         switch (IO->NextDBOperation(IO))
 140         {
 141         case eDBQuery:
 142                 break;
 143         case eSendDNSQuery:
 144         case eReadDNSReply:
 145         case eConnect:
 146         case eSendReply:
 147         case eSendMore:
 148         case eReadMessage:
 149         case eReadMore:
 150         case eReadPayload:
 151                 ev_cleanup_stop(loop, &IO->db_abort_by_shutdown);
 152                 break;
 153         case eTerminateConnection:
 154         case eAbort:
 155             ShutDownDBCLient(IO);
 156         }
 157 }
 158
 159 eNextState NextDBOperation(AsyncIO *IO, IO_CallBack CB)
 160 {
 161         IO->NextDBOperation = CB;
 162         ev_idle_init(&IO->db_unwind_stack,
 163                      DB_PerformNext);
 164         IO->db_unwind_stack.data = IO;
 165         ev_idle_start(event_db, &IO->db_unwind_stack);
 166         return eDBQuery;
 167 }
 168
 169 /*--------------------------------------------------------------------------------
 170  * Client IO
 171  */
 172 extern int evbase_count;
 173 extern citthread_mutex_t EventQueueMutex;
 174 extern HashList *InboundEventQueue;
 175 extern struct ev_loop *event_base;
 176 extern ev_async AddJob;
 177 extern ev_async ExitEventLoop;
 178
 179
 180 int QueueEventContext(AsyncIO *IO, IO_CallBack CB)
 181 {
 182         IOAddHandler *h;
 183         int i;
 184
 185         h = (IOAddHandler*)malloc(sizeof(IOAddHandler));
 186         h->IO = IO;
 187         h->EvAttch = CB;
 188         ev_cleanup_init(&IO->abort_by_shutdown,
 189                         IO_abort_shutdown_callback);
 190         IO->abort_by_shutdown.data = IO;
 191         ev_cleanup_start(event_base, &IO->abort_by_shutdown);
 192
 193         citthread_mutex_lock(&EventQueueMutex);
 194         CtdlLogPrintf(CTDL_DEBUG, "EVENT Q\n");
 195         i = ++evbase_count;
 196         Put(InboundEventQueue, IKEY(i), h, NULL);
 197         citthread_mutex_unlock(&EventQueueMutex);
 198
 199         ev_async_send (event_base, &AddJob);
 200         CtdlLogPrintf(CTDL_DEBUG, "EVENT Q Done.\n");
 201         return 0;
 202 }
 203
 204 int ShutDownEventQueue(void)
 205 {
 206         citthread_mutex_lock(&DBEventQueueMutex);
 207         ev_async_send (event_db, &DBExitEventLoop);
 208         citthread_mutex_unlock(&DBEventQueueMutex);
 209
 210         citthread_mutex_lock(&EventQueueMutex);
 211         ev_async_send (EV_DEFAULT_ &ExitEventLoop);
 212         citthread_mutex_unlock(&EventQueueMutex);
 213         return 0;
 214 }
 215
 216 void FreeAsyncIOContents(AsyncIO *IO)
 217 {
 218         FreeStrBuf(&IO->IOBuf);
 219         FreeStrBuf(&IO->SendBuf.Buf);
 220         FreeStrBuf(&IO->RecvBuf.Buf);
 221 }
 222
 223
 224 void StopClientWatchers(AsyncIO *IO)
 225 {
 226         ev_timer_stop(event_base, &IO->conn_fail);
 227         ev_io_stop(event_base, &IO->conn_event);
 228         ev_idle_stop(event_base, &IO->unwind_stack);
 229
 230         ev_io_stop(event_base, &IO->send_event);
 231         ev_io_stop(event_base, &IO->recv_event);
 232         ev_timer_stop (event_base, &IO->rw_timeout);
 233         close(IO->SendBuf.fd);
 234         IO->SendBuf.fd = 0;
 235         IO->RecvBuf.fd = 0;
 236 }
 237
 238 void ShutDownCLient(AsyncIO *IO)
 239 {
 240         CitContext *Ctx =IO->CitContext;
 241         become_session(Ctx);
 242
 243         CtdlLogPrintf(CTDL_DEBUG, "EVENT x %d\n", IO->SendBuf.fd);
 244
 245         ev_cleanup_stop(event_base, &IO->abort_by_shutdown);
 246         StopClientWatchers(IO);
 247
 248         if (IO->DNSChannel != NULL) {
 249                 ares_destroy(IO->DNSChannel);
 250                 ev_io_stop(event_base, &IO->dns_recv_event);
 251                 ev_io_stop(event_base, &IO->dns_send_event);
 252                 IO->DNSChannel = NULL;
 253         }
 254         assert(IO->Terminate);
 255         IO->Terminate(IO);
 256         Ctx->state = CON_IDLE;
 257         Ctx->kill_me = 1;
 258 }
 259
 260
 261 eReadState HandleInbound(AsyncIO *IO)
 262 {
 263         eReadState Finished = eBufferNotEmpty;
 264
 265         become_session(IO->CitContext);
 266
 267         while ((Finished == eBufferNotEmpty) &&
 268                ((IO->NextState == eReadMessage)||
 269                 (IO->NextState == eReadMore)||
 270                 (IO->NextState == eReadPayload)))
 271         {
 272                 if (IO->RecvBuf.nBlobBytesWanted != 0) {
 273
 274                 }
 275                 else { /* Reading lines... */
 276 //// lex line reply in callback, or do it ourselves. as nnn-blabla means continue reading in SMTP
 277                         if (IO->LineReader)
 278                                 Finished = IO->LineReader(IO);
 279                         else
 280                                 Finished = StrBufChunkSipLine(IO->IOBuf, &IO->RecvBuf);
 281
 282                         switch (Finished) {
 283                         case eMustReadMore: /// read new from socket...
 284                                 break;
 285                         case eBufferNotEmpty: /* shouldn't happen... */
 286                         case eReadSuccess: /// done for now...
 287                                 break;
 288                         case eReadFail: /// WHUT?
 289                                 ///todo: shut down!
 290                                 break;
 291                         }
 292
 293                 }
 294
 295                 if (Finished != eMustReadMore) {
 296                         assert(IO->ReadDone);
 297                         ev_io_stop(event_base, &IO->recv_event);
 298                         IO->NextState = IO->ReadDone(IO);
 299                         Finished = StrBufCheckBuffer(&IO->RecvBuf);
 300                 }
 301         }
 302
 303         switch (IO->NextState) {
 304         case eSendReply:
 305         case eSendMore:
 306                 assert(IO->SendDone);
 307                 IO->NextState = IO->SendDone(IO);
 308                 ev_io_start(event_base, &IO->send_event);
 309                 break;
 310         case eReadPayload:
 311         case eReadMore:
 312                 ev_io_start(event_base, &IO->recv_event);
 313                 break;
 314         case eTerminateConnection:
 315         case eAbort:
 316                 ShutDownCLient(IO);
 317                 break;
 318         case eSendDNSQuery:
 319         case eReadDNSReply:
 320         case eDBQuery:
 321         case eConnect:
 322         case eReadMessage:
 323                 break;
 324         }
 325         return Finished;
 326 }
 327
 328
 329 static void
 330 IO_send_callback(struct ev_loop *loop, ev_io *watcher, int revents)
 331 {
 332         int rc;
 333         AsyncIO *IO = watcher->data;
 334
 335         become_session(IO->CitContext);
 336 #ifdef BIGBAD_IODBG
 337         {
 338                 int rv = 0;
 339                 char fn [SIZ];
 340                 FILE *fd;
 341                 const char *pch = ChrPtr(IO->SendBuf.Buf);
 342                 const char *pchh = IO->SendBuf.ReadWritePointer;
 343                 long nbytes;
 344
 345                 if (pchh == NULL)
 346                         pchh = pch;
 347
 348                 nbytes = StrLength(IO->SendBuf.Buf) - (pchh - pch);
 349                 snprintf(fn, SIZ, "/tmp/foolog_ev_%s.%d",
 350                          ((CitContext*)(IO->CitContext))->ServiceName,
 351                          IO->SendBuf.fd);
 352
 353                 fd = fopen(fn, "a+");
 354                 fprintf(fd, "Send: BufSize: %ld BufContent: [",
 355                         nbytes);
 356                 rv = fwrite(pchh, nbytes, 1, fd);
 357                 if (!rv) printf("failed to write debug to %s!\n", fn);
 358                 fprintf(fd, "]\n");
 359 #endif
 360                 rc = StrBuf_write_one_chunk_callback(watcher->fd, 0/*TODO*/, &IO->SendBuf);
 361
 362 #ifdef BIGBAD_IODBG
 363                 fprintf(fd, "Sent: BufSize: %d bytes.\n", rc);
 364                 fclose(fd);
 365         }
 366 #endif
 367         if (rc == 0)
 368         {
 369                 ev_io_stop(event_base, &IO->send_event);
 370                 switch (IO->NextState) {
 371                 case eSendMore:
 372                         assert(IO->SendDone);
 373                         IO->NextState = IO->SendDone(IO);
 374
 375                         if ((IO->NextState == eTerminateConnection) ||
 376                             (IO->NextState == eAbort) )
 377                                 ShutDownCLient(IO);
 378                         else {
 379                                 ev_io_start(event_base, &IO->send_event);
 380                         }
 381                         break;
 382                 case eSendReply:
 383                     if (StrBufCheckBuffer(&IO->SendBuf) != eReadSuccess)
 384                         break;
 385                     IO->NextState = eReadMore;
 386                 case eReadMore:
 387                 case eReadMessage:
 388                 case eReadPayload:
 389                         if (StrBufCheckBuffer(&IO->RecvBuf) == eBufferNotEmpty) {
 390                                 HandleInbound(IO);
 391                         }
 392                         else {
 393                                 ev_io_start(event_base, &IO->recv_event);
 394                         }
 395
 396                         break;
 397                 case eDBQuery:
 398                         /* we now live in another queue, so we have to unregister. */
 399                         ev_cleanup_stop(loop, &IO->abort_by_shutdown);
 400                         break;
 401                 case eSendDNSQuery:
 402                 case eReadDNSReply:
 403                 case eConnect:
 404                 case eTerminateConnection:
 405                 case eAbort:
 406                         break;
 407                 }
 408         }
 409         else if (rc < 0) {
 410                 assert(IO->Timeout);
 411                 IO->Timeout(IO);
 412         }
 413         /* else : must write more. */
 414 }
 415 static void
 416 set_start_callback(struct ev_loop *loop, AsyncIO *IO, int revents)
 417 {
 418
 419         switch(IO->NextState) {
 420         case eReadMore:
 421         case eReadMessage:
 422                 ev_io_start(event_base, &IO->recv_event);
 423                 break;
 424         case eSendReply:
 425         case eSendMore:
 426         case eReadPayload:
 427                 become_session(IO->CitContext);
 428                 IO_send_callback(loop, &IO->send_event, revents);
 429                 break;
 430         case eDBQuery:
 431         case eSendDNSQuery:
 432         case eReadDNSReply:
 433         case eConnect:
 434         case eTerminateConnection:
 435         case eAbort:
 436                 /// TODO: WHUT?
 437                 break;
 438         }
 439 }
 440
 441 static void
 442 IO_Timeout_callback(struct ev_loop *loop, ev_timer *watcher, int revents)
 443 {
 444         AsyncIO *IO = watcher->data;
 445
 446         ev_timer_stop (event_base, &IO->rw_timeout);
 447         become_session(IO->CitContext);
 448
 449         if (IO->SendBuf.fd != 0)
 450         {
 451                 ev_io_stop(event_base, &IO->send_event);
 452                 ev_io_stop(event_base, &IO->recv_event);
 453                 ev_timer_stop (event_base, &IO->rw_timeout);
 454                 close(IO->SendBuf.fd);
 455                 IO->SendBuf.fd = IO->RecvBuf.fd = 0;
 456         }
 457
 458         assert(IO->Timeout);
 459         switch (IO->Timeout(IO))
 460         {
 461         case eAbort:
 462                 ShutDownCLient(IO);
 463         default:
 464                 break;
 465         }
 466 }
 467
 468 static void
 469 IO_connfail_callback(struct ev_loop *loop, ev_timer *watcher, int revents)
 470 {
 471         AsyncIO *IO = watcher->data;
 472
 473         ev_timer_stop (event_base, &IO->conn_fail);
 474
 475         if (IO->SendBuf.fd != 0)
 476         {
 477                 ev_io_stop(loop, &IO->conn_event);
 478                 ev_io_stop(event_base, &IO->send_event);
 479                 ev_io_stop(event_base, &IO->recv_event);
 480                 ev_timer_stop (event_base, &IO->rw_timeout);
 481                 close(IO->SendBuf.fd);
 482                 IO->SendBuf.fd = IO->RecvBuf.fd = 0;
 483         }
 484         become_session(IO->CitContext);
 485
 486         assert(IO->ConnFail);
 487         switch (IO->ConnFail(IO))
 488         {
 489         case eAbort:
 490                 ShutDownCLient(IO);
 491         default:
 492                 break;
 493
 494         }
 495 }
 496
 497 static void
 498 IO_connfailimmediate_callback(struct ev_loop *loop, ev_idle *watcher, int revents)
 499 {
 500         AsyncIO *IO = watcher->data;
 501
 502         ev_idle_stop (event_base, &IO->conn_fail_immediate);
 503
 504         if (IO->SendBuf.fd != 0)
 505         {
 506                 close(IO->SendBuf.fd);
 507                 IO->SendBuf.fd = IO->RecvBuf.fd = 0;
 508         }
 509         become_session(IO->CitContext);
 510
 511         assert(IO->ConnFail);
 512         switch (IO->ConnFail(IO))
 513         {
 514         case eAbort:
 515                 ShutDownCLient(IO);
 516         default:
 517                 break;
 518
 519         }
 520 }
 521
 522 static void
 523 IO_connestd_callback(struct ev_loop *loop, ev_io *watcher, int revents)
 524 {
 525         AsyncIO *IO = watcher->data;
 526
 527         ev_io_stop(loop, &IO->conn_event);
 528         ev_timer_stop (event_base, &IO->conn_fail);
 529         set_start_callback(loop, IO, revents);
 530 }
 531 static void
 532 IO_recv_callback(struct ev_loop *loop, ev_io *watcher, int revents)
 533 {
 534         ssize_t nbytes;
 535         AsyncIO *IO = watcher->data;
 536
 537         nbytes = StrBuf_read_one_chunk_callback(watcher->fd, 0 /*TODO */, &IO->RecvBuf);
 538 #ifdef BIGBAD_IODBG
 539         {
 540                 int rv = 0;
 541                 char fn [SIZ];
 542                 FILE *fd;
 543                 const char *pch = ChrPtr(IO->RecvBuf.Buf);
 544                 const char *pchh = IO->RecvBuf.ReadWritePointer;
 545                 long nbytes;
 546
 547                 if (pchh == NULL)
 548                         pchh = pch;
 549
 550                 nbytes = StrLength(IO->RecvBuf.Buf) - (pchh - pch);
 551                 snprintf(fn, SIZ, "/tmp/foolog_ev_%s.%d",
 552                          ((CitContext*)(IO->CitContext))->ServiceName,
 553                          IO->SendBuf.fd);
 554
 555                 fd = fopen(fn, "a+");
 556                 fprintf(fd, "Read: BufSize: %ld BufContent: [",
 557                         nbytes);
 558                 rv = fwrite(pchh, nbytes, 1, fd);
 559                 if (!rv) printf("failed to write debug to %s!\n", fn);
 560                 fprintf(fd, "]\n");
 561
 562
 563                 fclose(fd);
 564         }
 565 #endif
 566         if (nbytes > 0) {
 567                 HandleInbound(IO);
 568         } else if (nbytes == 0) {
 569                 assert(IO->Timeout);
 570
 571                 switch (IO->Timeout(IO))
 572                 {
 573                 case eAbort:
 574                         ShutDownCLient(IO);
 575                 default:
 576                         break;
 577                 }
 578                 return;
 579         } else if (nbytes == -1) {
 580 /// TODO: FD is gone. kick it.        sock_buff_invoke_free(sb, errno);
 581                 CtdlLogPrintf(CTDL_DEBUG,
 582                               "EVENT: Socket Invalid! %s \n",
 583                               strerror(errno));
 584                 return;
 585         }
 586 }
 587
 588 void
 589 IO_postdns_callback(struct ev_loop *loop, ev_idle *watcher, int revents)
 590 {
 591         AsyncIO *IO = watcher->data;
 592         CtdlLogPrintf(CTDL_DEBUG, "event: %s\n", __FUNCTION__);
 593         become_session(IO->CitContext);
 594
 595         switch (IO->DNSQuery->PostDNS(IO))
 596         {
 597         case eAbort:
 598             ShutDownCLient(IO);
 599         default:
 600             break;
 601         }
 602 }
 603
 604 eNextState event_connect_socket(AsyncIO *IO, double conn_timeout, double first_rw_timeout)
 605 {
 606         int fdflags;
 607         int rc = -1;
 608
 609         IO->SendBuf.fd = IO->RecvBuf.fd =
 610                 socket(
 611                         (IO->ConnectMe->IPv6)?PF_INET6:PF_INET,
 612                         SOCK_STREAM,
 613                         IPPROTO_TCP);
 614
 615         if (IO->SendBuf.fd < 0) {
 616                 CtdlLogPrintf(CTDL_ERR, "EVENT: socket() failed: %s\n", strerror(errno));
 617                 StrBufPrintf(IO->ErrMsg, "Failed to create socket: %s", strerror(errno));
 618                 return eAbort;
 619         }
 620         fdflags = fcntl(IO->SendBuf.fd, F_GETFL);
 621         if (fdflags < 0) {
 622                 CtdlLogPrintf(CTDL_DEBUG,
 623                               "EVENT: unable to get socket flags! %s \n",
 624                               strerror(errno));
 625                 StrBufPrintf(IO->ErrMsg, "Failed to get socket flags: %s", strerror(errno));
 626                 return eAbort;
 627         }
 628         fdflags = fdflags | O_NONBLOCK;
 629         if (fcntl(IO->SendBuf.fd, F_SETFL, fdflags) < 0) {
 630                 CtdlLogPrintf(CTDL_DEBUG,
 631                               "EVENT: unable to set socket nonblocking flags! %s \n",
 632                               strerror(errno));
 633                 StrBufPrintf(IO->ErrMsg, "Failed to set socket flags: %s", strerror(errno));
 634                 close(IO->SendBuf.fd);
 635                 IO->SendBuf.fd = IO->RecvBuf.fd = -1;
 636                 return eAbort;
 637         }
 638 /* TODO: maye we could use offsetof() to calc the position of data...
 639  * http://doc.dvgu.ru/devel/ev.html#associating_custom_data_with_a_watcher
 640  */
 641         ev_io_init(&IO->recv_event, IO_recv_callback, IO->RecvBuf.fd, EV_READ);
 642         IO->recv_event.data = IO;
 643         ev_io_init(&IO->send_event, IO_send_callback, IO->SendBuf.fd, EV_WRITE);
 644         IO->send_event.data = IO;
 645
 646         ev_timer_init(&IO->conn_fail, IO_connfail_callback, conn_timeout, 0);
 647         IO->conn_fail.data = IO;
 648         ev_timer_init(&IO->rw_timeout, IO_Timeout_callback, first_rw_timeout, 0);
 649         IO->rw_timeout.data = IO;
 650
 651
 652         /*  Bypass it like this: IO->Addr.sin_addr.s_addr = inet_addr("127.0.0.1"); */
 653 ///     ((struct sockaddr_in)IO->ConnectMe->Addr).sin_addr.s_addr = inet_addr("127.0.0.1");
 654         if (IO->ConnectMe->IPv6)
 655                 rc = connect(IO->SendBuf.fd, &IO->ConnectMe->Addr, sizeof(struct sockaddr_in6));
 656         else
 657                 rc = connect(IO->SendBuf.fd, (struct sockaddr_in *)&IO->ConnectMe->Addr, sizeof(struct sockaddr_in));
 658
 659         if (rc >= 0){
 660                 CtdlLogPrintf(CTDL_DEBUG, "connect() immediate success.\n");
 661                 set_start_callback(event_base, IO, 0);
 662                 ev_timer_start(event_base, &IO->rw_timeout);
 663                 return IO->NextState;
 664         }
 665         else if (errno == EINPROGRESS) {
 666                 CtdlLogPrintf(CTDL_DEBUG, "connect() have to wait now.\n");
 667
 668                 ev_io_init(&IO->conn_event, IO_connestd_callback, IO->SendBuf.fd, EV_READ|EV_WRITE);
 669                 IO->conn_event.data = IO;
 670
 671                 ev_io_start(event_base, &IO->conn_event);
 672                 ev_timer_start(event_base, &IO->conn_fail);
 673                 return IO->NextState;
 674         }
 675         else {
 676                 ev_idle_init(&IO->conn_fail_immediate,
 677                              IO_connfailimmediate_callback);
 678                 IO->conn_fail_immediate.data = IO;
 679                 ev_idle_start(event_base, &IO->conn_fail_immediate);
 680
 681                 CtdlLogPrintf(CTDL_ERR, "connect() failed: %s\n", strerror(errno));
 682                 StrBufPrintf(IO->ErrMsg, "Failed to connect: %s", strerror(errno));
 683                 return IO->NextState;
 684         }
 685         return IO->NextState;
 686 }
 687
 688 void SetNextTimeout(AsyncIO *IO, double timeout)
 689 {
 690         IO->rw_timeout.repeat = timeout;
 691         ev_timer_again (event_base,  &IO->rw_timeout);
 692 }
 693
 694 eNextState InitEventIO(AsyncIO *IO,
 695                        void *pData,
 696                        double conn_timeout,
 697                        double first_rw_timeout,
 698                        int ReadFirst)
 699 {
 700         IO->Data = pData;
 701         become_session(IO->CitContext);
 702
 703         if (ReadFirst) {
 704                 IO->NextState = eReadMessage;
 705         }
 706         else {
 707                 IO->NextState = eSendReply;
 708         }
 709         return event_connect_socket(IO, conn_timeout, first_rw_timeout);
 710 }
 711
 712 eNextState ReAttachIO(AsyncIO *IO,
 713                       void *pData,
 714                       int ReadFirst)
 715 {
 716         IO->Data = pData;
 717         become_session(IO->CitContext);
 718         ev_cleanup_start(event_base, &IO->abort_by_shutdown);
 719         if (ReadFirst) {
 720                 IO->NextState = eReadMessage;
 721         }
 722         else {
 723                 IO->NextState = eSendReply;
 724         }
 725         set_start_callback(event_base, IO, 0);
 726
 727         return IO->NextState;
 728 }