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                                 return Finished;
 285                                 break;
 286                         case eBufferNotEmpty: /* shouldn't happen... */
 287                         case eReadSuccess: /// done for now...
 288                                 break;
 289                         case eReadFail: /// WHUT?
 290                                 ///todo: shut down!
 291                                 break;
 292                         }
 293
 294                 }
 295
 296                 if (Finished != eMustReadMore) {
 297                         assert(IO->ReadDone);
 298                         ev_io_stop(event_base, &IO->recv_event);
 299                         IO->NextState = IO->ReadDone(IO);
 300                         Finished = StrBufCheckBuffer(&IO->RecvBuf);
 301                 }
 302         }
 303
 304         switch (IO->NextState) {
 305         case eSendReply:
 306         case eSendMore:
 307                 assert(IO->SendDone);
 308                 IO->NextState = IO->SendDone(IO);
 309                 ev_io_start(event_base, &IO->send_event);
 310                 break;
 311         case eReadPayload:
 312         case eReadMore:
 313                 ev_io_start(event_base, &IO->recv_event);
 314                 break;
 315         case eTerminateConnection:
 316         case eAbort:
 317                 ShutDownCLient(IO);
 318                 break;
 319         case eSendDNSQuery:
 320         case eReadDNSReply:
 321         case eDBQuery:
 322         case eConnect:
 323         case eReadMessage:
 324                 break;
 325         }
 326         return Finished;
 327 }
 328
 329
 330 static void
 331 IO_send_callback(struct ev_loop *loop, ev_io *watcher, int revents)
 332 {
 333         int rc;
 334         AsyncIO *IO = watcher->data;
 335
 336         become_session(IO->CitContext);
 337 #ifdef BIGBAD_IODBG
 338         {
 339                 int rv = 0;
 340                 char fn [SIZ];
 341                 FILE *fd;
 342                 const char *pch = ChrPtr(IO->SendBuf.Buf);
 343                 const char *pchh = IO->SendBuf.ReadWritePointer;
 344                 long nbytes;
 345
 346                 if (pchh == NULL)
 347                         pchh = pch;
 348
 349                 nbytes = StrLength(IO->SendBuf.Buf) - (pchh - pch);
 350                 snprintf(fn, SIZ, "/tmp/foolog_ev_%s.%d",
 351                          ((CitContext*)(IO->CitContext))->ServiceName,
 352                          IO->SendBuf.fd);
 353
 354                 fd = fopen(fn, "a+");
 355                 fprintf(fd, "Send: BufSize: %ld BufContent: [",
 356                         nbytes);
 357                 rv = fwrite(pchh, nbytes, 1, fd);
 358                 if (!rv) printf("failed to write debug to %s!\n", fn);
 359                 fprintf(fd, "]\n");
 360 #endif
 361                 rc = StrBuf_write_one_chunk_callback(watcher->fd, 0/*TODO*/, &IO->SendBuf);
 362
 363 #ifdef BIGBAD_IODBG
 364                 fprintf(fd, "Sent: BufSize: %d bytes.\n", rc);
 365                 fclose(fd);
 366         }
 367 #endif
 368         if (rc == 0)
 369         {
 370                 ev_io_stop(event_base, &IO->send_event);
 371                 switch (IO->NextState) {
 372                 case eSendMore:
 373                         assert(IO->SendDone);
 374                         IO->NextState = IO->SendDone(IO);
 375
 376                         if ((IO->NextState == eTerminateConnection) ||
 377                             (IO->NextState == eAbort) )
 378                                 ShutDownCLient(IO);
 379                         else {
 380                                 ev_io_start(event_base, &IO->send_event);
 381                         }
 382                         break;
 383                 case eSendReply:
 384                     if (StrBufCheckBuffer(&IO->SendBuf) != eReadSuccess)
 385                         break;
 386                     IO->NextState = eReadMore;
 387                 case eReadMore:
 388                 case eReadMessage:
 389                 case eReadPayload:
 390                         if (StrBufCheckBuffer(&IO->RecvBuf) == eBufferNotEmpty) {
 391                                 HandleInbound(IO);
 392                         }
 393                         else {
 394                                 ev_io_start(event_base, &IO->recv_event);
 395                         }
 396
 397                         break;
 398                 case eDBQuery:
 399                         /* we now live in another queue, so we have to unregister. */
 400                         ev_cleanup_stop(loop, &IO->abort_by_shutdown);
 401                         break;
 402                 case eSendDNSQuery:
 403                 case eReadDNSReply:
 404                 case eConnect:
 405                 case eTerminateConnection:
 406                 case eAbort:
 407                         break;
 408                 }
 409         }
 410         else if (rc < 0) {
 411                 assert(IO->Timeout);
 412                 IO->Timeout(IO);
 413         }
 414         /* else : must write more. */
 415 }
 416 static void
 417 set_start_callback(struct ev_loop *loop, AsyncIO *IO, int revents)
 418 {
 419
 420         switch(IO->NextState) {
 421         case eReadMore:
 422         case eReadMessage:
 423                 ev_io_start(event_base, &IO->recv_event);
 424                 break;
 425         case eSendReply:
 426         case eSendMore:
 427         case eReadPayload:
 428                 become_session(IO->CitContext);
 429                 IO_send_callback(loop, &IO->send_event, revents);
 430                 break;
 431         case eDBQuery:
 432         case eSendDNSQuery:
 433         case eReadDNSReply:
 434         case eConnect:
 435         case eTerminateConnection:
 436         case eAbort:
 437                 /// TODO: WHUT?
 438                 break;
 439         }
 440 }
 441
 442 static void
 443 IO_Timeout_callback(struct ev_loop *loop, ev_timer *watcher, int revents)
 444 {
 445         AsyncIO *IO = watcher->data;
 446
 447         ev_timer_stop (event_base, &IO->rw_timeout);
 448         become_session(IO->CitContext);
 449
 450         if (IO->SendBuf.fd != 0)
 451         {
 452                 ev_io_stop(event_base, &IO->send_event);
 453                 ev_io_stop(event_base, &IO->recv_event);
 454                 ev_timer_stop (event_base, &IO->rw_timeout);
 455                 close(IO->SendBuf.fd);
 456                 IO->SendBuf.fd = IO->RecvBuf.fd = 0;
 457         }
 458
 459         assert(IO->Timeout);
 460         switch (IO->Timeout(IO))
 461         {
 462         case eAbort:
 463                 ShutDownCLient(IO);
 464         default:
 465                 break;
 466         }
 467 }
 468
 469 static void
 470 IO_connfail_callback(struct ev_loop *loop, ev_timer *watcher, int revents)
 471 {
 472         AsyncIO *IO = watcher->data;
 473
 474         ev_timer_stop (event_base, &IO->conn_fail);
 475
 476         if (IO->SendBuf.fd != 0)
 477         {
 478                 ev_io_stop(loop, &IO->conn_event);
 479                 ev_io_stop(event_base, &IO->send_event);
 480                 ev_io_stop(event_base, &IO->recv_event);
 481                 ev_timer_stop (event_base, &IO->rw_timeout);
 482                 close(IO->SendBuf.fd);
 483                 IO->SendBuf.fd = IO->RecvBuf.fd = 0;
 484         }
 485         become_session(IO->CitContext);
 486
 487         assert(IO->ConnFail);
 488         switch (IO->ConnFail(IO))
 489         {
 490         case eAbort:
 491                 ShutDownCLient(IO);
 492         default:
 493                 break;
 494
 495         }
 496 }
 497
 498 static void
 499 IO_connfailimmediate_callback(struct ev_loop *loop, ev_idle *watcher, int revents)
 500 {
 501         AsyncIO *IO = watcher->data;
 502
 503         ev_idle_stop (event_base, &IO->conn_fail_immediate);
 504
 505         if (IO->SendBuf.fd != 0)
 506         {
 507                 close(IO->SendBuf.fd);
 508                 IO->SendBuf.fd = IO->RecvBuf.fd = 0;
 509         }
 510         become_session(IO->CitContext);
 511
 512         assert(IO->ConnFail);
 513         switch (IO->ConnFail(IO))
 514         {
 515         case eAbort:
 516                 ShutDownCLient(IO);
 517         default:
 518                 break;
 519
 520         }
 521 }
 522
 523 static void
 524 IO_connestd_callback(struct ev_loop *loop, ev_io *watcher, int revents)
 525 {
 526         AsyncIO *IO = watcher->data;
 527
 528         ev_io_stop(loop, &IO->conn_event);
 529         ev_timer_stop (event_base, &IO->conn_fail);
 530         set_start_callback(loop, IO, revents);
 531 }
 532 static void
 533 IO_recv_callback(struct ev_loop *loop, ev_io *watcher, int revents)
 534 {
 535         ssize_t nbytes;
 536         AsyncIO *IO = watcher->data;
 537
 538         nbytes = StrBuf_read_one_chunk_callback(watcher->fd, 0 /*TODO */, &IO->RecvBuf);
 539 #ifdef BIGBAD_IODBG
 540         {
 541                 int rv = 0;
 542                 char fn [SIZ];
 543                 FILE *fd;
 544                 const char *pch = ChrPtr(IO->RecvBuf.Buf);
 545                 const char *pchh = IO->RecvBuf.ReadWritePointer;
 546                 long nbytes;
 547
 548                 if (pchh == NULL)
 549                         pchh = pch;
 550
 551                 nbytes = StrLength(IO->RecvBuf.Buf) - (pchh - pch);
 552                 snprintf(fn, SIZ, "/tmp/foolog_ev_%s.%d",
 553                          ((CitContext*)(IO->CitContext))->ServiceName,
 554                          IO->SendBuf.fd);
 555
 556                 fd = fopen(fn, "a+");
 557                 fprintf(fd, "Read: BufSize: %ld BufContent: [",
 558                         nbytes);
 559                 rv = fwrite(pchh, nbytes, 1, fd);
 560                 if (!rv) printf("failed to write debug to %s!\n", fn);
 561                 fprintf(fd, "]\n");
 562
 563
 564                 fclose(fd);
 565         }
 566 #endif
 567         if (nbytes > 0) {
 568                 HandleInbound(IO);
 569         } else if (nbytes == 0) {
 570                 assert(IO->Timeout);
 571
 572                 switch (IO->Timeout(IO))
 573                 {
 574                 case eAbort:
 575                         ShutDownCLient(IO);
 576                 default:
 577                         break;
 578                 }
 579                 return;
 580         } else if (nbytes == -1) {
 581 /// TODO: FD is gone. kick it.        sock_buff_invoke_free(sb, errno);
 582                 CtdlLogPrintf(CTDL_DEBUG,
 583                               "EVENT: Socket Invalid! %s \n",
 584                               strerror(errno));
 585                 return;
 586         }
 587 }
 588
 589 void
 590 IO_postdns_callback(struct ev_loop *loop, ev_idle *watcher, int revents)
 591 {
 592         AsyncIO *IO = watcher->data;
 593         CtdlLogPrintf(CTDL_DEBUG, "event: %s\n", __FUNCTION__);
 594         become_session(IO->CitContext);
 595
 596         switch (IO->DNSQuery->PostDNS(IO))
 597         {
 598         case eAbort:
 599             ShutDownCLient(IO);
 600         default:
 601             break;
 602         }
 603 }
 604
 605 eNextState event_connect_socket(AsyncIO *IO, double conn_timeout, double first_rw_timeout)
 606 {
 607         int fdflags;
 608         int rc = -1;
 609
 610         IO->SendBuf.fd = IO->RecvBuf.fd =
 611                 socket(
 612                         (IO->ConnectMe->IPv6)?PF_INET6:PF_INET,
 613                         SOCK_STREAM,
 614                         IPPROTO_TCP);
 615
 616         if (IO->SendBuf.fd < 0) {
 617                 CtdlLogPrintf(CTDL_ERR, "EVENT: socket() failed: %s\n", strerror(errno));
 618                 StrBufPrintf(IO->ErrMsg, "Failed to create socket: %s", strerror(errno));
 619                 return eAbort;
 620         }
 621         fdflags = fcntl(IO->SendBuf.fd, F_GETFL);
 622         if (fdflags < 0) {
 623                 CtdlLogPrintf(CTDL_DEBUG,
 624                               "EVENT: unable to get socket flags! %s \n",
 625                               strerror(errno));
 626                 StrBufPrintf(IO->ErrMsg, "Failed to get socket flags: %s", strerror(errno));
 627                 return eAbort;
 628         }
 629         fdflags = fdflags | O_NONBLOCK;
 630         if (fcntl(IO->SendBuf.fd, F_SETFL, fdflags) < 0) {
 631                 CtdlLogPrintf(CTDL_DEBUG,
 632                               "EVENT: unable to set socket nonblocking flags! %s \n",
 633                               strerror(errno));
 634                 StrBufPrintf(IO->ErrMsg, "Failed to set socket flags: %s", strerror(errno));
 635                 close(IO->SendBuf.fd);
 636                 IO->SendBuf.fd = IO->RecvBuf.fd = -1;
 637                 return eAbort;
 638         }
 639 /* TODO: maye we could use offsetof() to calc the position of data...
 640  * http://doc.dvgu.ru/devel/ev.html#associating_custom_data_with_a_watcher
 641  */
 642         ev_io_init(&IO->recv_event, IO_recv_callback, IO->RecvBuf.fd, EV_READ);
 643         IO->recv_event.data = IO;
 644         ev_io_init(&IO->send_event, IO_send_callback, IO->SendBuf.fd, EV_WRITE);
 645         IO->send_event.data = IO;
 646
 647         ev_timer_init(&IO->conn_fail, IO_connfail_callback, conn_timeout, 0);
 648         IO->conn_fail.data = IO;
 649         ev_timer_init(&IO->rw_timeout, IO_Timeout_callback, first_rw_timeout, 0);
 650         IO->rw_timeout.data = IO;
 651
 652
 653         /*  Bypass it like this: IO->Addr.sin_addr.s_addr = inet_addr("127.0.0.1"); */
 654 ///     ((struct sockaddr_in)IO->ConnectMe->Addr).sin_addr.s_addr = inet_addr("127.0.0.1");
 655         if (IO->ConnectMe->IPv6)
 656                 rc = connect(IO->SendBuf.fd, &IO->ConnectMe->Addr, sizeof(struct sockaddr_in6));
 657         else
 658                 rc = connect(IO->SendBuf.fd, (struct sockaddr_in *)&IO->ConnectMe->Addr, sizeof(struct sockaddr_in));
 659
 660         if (rc >= 0){
 661                 CtdlLogPrintf(CTDL_DEBUG, "connect() immediate success.\n");
 662                 set_start_callback(event_base, IO, 0);
 663                 ev_timer_start(event_base, &IO->rw_timeout);
 664                 return IO->NextState;
 665         }
 666         else if (errno == EINPROGRESS) {
 667                 CtdlLogPrintf(CTDL_DEBUG, "connect() have to wait now.\n");
 668
 669                 ev_io_init(&IO->conn_event, IO_connestd_callback, IO->SendBuf.fd, EV_READ|EV_WRITE);
 670                 IO->conn_event.data = IO;
 671
 672                 ev_io_start(event_base, &IO->conn_event);
 673                 ev_timer_start(event_base, &IO->conn_fail);
 674                 return IO->NextState;
 675         }
 676         else {
 677                 ev_idle_init(&IO->conn_fail_immediate,
 678                              IO_connfailimmediate_callback);
 679                 IO->conn_fail_immediate.data = IO;
 680                 ev_idle_start(event_base, &IO->conn_fail_immediate);
 681
 682                 CtdlLogPrintf(CTDL_ERR, "connect() failed: %s\n", strerror(errno));
 683                 StrBufPrintf(IO->ErrMsg, "Failed to connect: %s", strerror(errno));
 684                 return IO->NextState;
 685         }
 686         return IO->NextState;
 687 }
 688
 689 void SetNextTimeout(AsyncIO *IO, double timeout)
 690 {
 691         IO->rw_timeout.repeat = timeout;
 692         ev_timer_again (event_base,  &IO->rw_timeout);
 693 }
 694
 695 eNextState InitEventIO(AsyncIO *IO,
 696                        void *pData,
 697                        double conn_timeout,
 698                        double first_rw_timeout,
 699                        int ReadFirst)
 700 {
 701         IO->Data = pData;
 702         become_session(IO->CitContext);
 703
 704         if (ReadFirst) {
 705                 IO->NextState = eReadMessage;
 706         }
 707         else {
 708                 IO->NextState = eSendReply;
 709         }
 710         return event_connect_socket(IO, conn_timeout, first_rw_timeout);
 711 }
 712
 713 eNextState ReAttachIO(AsyncIO *IO,
 714                       void *pData,
 715                       int ReadFirst)
 716 {
 717         IO->Data = pData;
 718         become_session(IO->CitContext);
 719         ev_cleanup_start(event_base, &IO->abort_by_shutdown);
 720         if (ReadFirst) {
 721                 IO->NextState = eReadMessage;
 722         }
 723         else {
 724                 IO->NextState = eSendReply;
 725         }
 726         set_start_callback(event_base, IO, 0);
 727
 728         return IO->NextState;
 729 }