src/inspsocket.cpp

   1 /*       +------------------------------------+
   2  *       | Inspire Internet Relay Chat Daemon |
   3  *       +------------------------------------+
   4  *
   5  *  InspIRCd: (C) 2002-2007 InspIRCd Development Team
   6  * See: http://www.inspircd.org/wiki/index.php/Credits
   7  *
   8  * This program is free but copyrighted software; see
   9  *            the file COPYING for details.
  10  *
  11  * ---------------------------------------------------
  12  */
  13
  14 /* $Core: libIRCDinspsocket */
  15
  16 #include "socket.h"
  17 #include "inspstring.h"
  18 #include "socketengine.h"
  19 #include "inspircd.h"
  20
  21 using irc::sockets::OpenTCPSocket;
  22
  23 bool BufferedSocket::Readable()
  24 {
  25         return ((this->state != I_CONNECTING) && (this->WaitingForWriteEvent == false));
  26 }
  27
  28 BufferedSocket::BufferedSocket(InspIRCd* SI)
  29 {
  30         this->Timeout = NULL;
  31         this->state = I_DISCONNECTED;
  32         this->fd = -1;
  33         this->WaitingForWriteEvent = false;
  34         this->Instance = SI;
  35         this->IsIOHooked = false;
  36 }
  37
  38 BufferedSocket::BufferedSocket(InspIRCd* SI, int newfd, const char* ip)
  39 {
  40         this->Timeout = NULL;
  41         this->fd = newfd;
  42         this->state = I_CONNECTED;
  43         strlcpy(this->IP,ip,MAXBUF);
  44         this->WaitingForWriteEvent = false;
  45         this->Instance = SI;
  46         this->IsIOHooked = false;
  47         if (this->fd > -1)
  48                 this->Instance->SE->AddFd(this);
  49 }
  50
  51 BufferedSocket::BufferedSocket(InspIRCd* SI, const std::string &ipaddr, int aport, bool listening, unsigned long maxtime, const std::string &connectbindip)
  52 {
  53         this->cbindip = connectbindip;
  54         this->fd = -1;
  55         this->Instance = SI;
  56         strlcpy(host,ipaddr.c_str(),MAXBUF);
  57         this->WaitingForWriteEvent = false;
  58         this->IsIOHooked = false;
  59         this->Timeout = NULL;
  60         if (listening)
  61         {
  62                 if ((this->fd = OpenTCPSocket(host)) == ERROR)
  63                 {
  64                         this->fd = -1;
  65                         this->state = I_ERROR;
  66                         this->OnError(I_ERR_SOCKET);
  67                         return;
  68                 }
  69                 else
  70                 {
  71                         if (!SI->BindSocket(this->fd,aport,(char*)ipaddr.c_str()))
  72                         {
  73                                 this->Close();
  74                                 this->fd = -1;
  75                                 this->state = I_ERROR;
  76                                 this->OnError(I_ERR_BIND);
  77                                 this->ClosePending = true;
  78                                 return;
  79                         }
  80                         else
  81                         {
  82                                 this->state = I_LISTENING;
  83                                 this->port = aport;
  84                                 if (this->fd > -1)
  85                                 {
  86                                         if (!this->Instance->SE->AddFd(this))
  87                                         {
  88                                                 this->Close();
  89                                                 this->state = I_ERROR;
  90                                                 this->OnError(I_ERR_NOMOREFDS);
  91                                         }
  92                                 }
  93                                 return;
  94                         }
  95                 }
  96         }
  97         else
  98         {
  99                 strlcpy(this->host,ipaddr.c_str(),MAXBUF);
 100                 this->port = aport;
 101
 102                 bool ipvalid = true;
 103 #ifdef IPV6
 104                 if (strchr(host,':'))
 105                 {
 106                         in6_addr n;
 107                         if (inet_pton(AF_INET6, host, &n) < 1)
 108                                 ipvalid = false;
 109                 }
 110                 else
 111 #endif
 112                 {
 113                         in_addr n;
 114                         if (inet_aton(host,&n) < 1)
 115                                 ipvalid = false;
 116                 }
 117                 if (!ipvalid)
 118                 {
 119                         this->Instance->Log(DEBUG,"BUG: Hostname passed to BufferedSocket, rather than an IP address!");
 120                         this->OnError(I_ERR_CONNECT);
 121                         this->Close();
 122                         this->fd = -1;
 123                         this->state = I_ERROR;
 124                         return;
 125                 }
 126                 else
 127                 {
 128                         strlcpy(this->IP,host,MAXBUF);
 129                         timeout_val = maxtime;
 130                         if (!this->DoConnect())
 131                         {
 132                                 this->OnError(I_ERR_CONNECT);
 133                                 this->Close();
 134                                 this->fd = -1;
 135                                 this->state = I_ERROR;
 136                                 return;
 137                         }
 138                 }
 139         }
 140 }
 141
 142 void BufferedSocket::WantWrite()
 143 {
 144         this->Instance->SE->WantWrite(this);
 145         this->WaitingForWriteEvent = true;
 146 }
 147
 148 void BufferedSocket::SetQueues(int nfd)
 149 {
 150         // attempt to increase socket sendq and recvq as high as its possible
 151         int sendbuf = 32768;
 152         int recvbuf = 32768;
 153         if(setsockopt(nfd,SOL_SOCKET,SO_SNDBUF,(const char *)&sendbuf,sizeof(sendbuf)) || setsockopt(nfd,SOL_SOCKET,SO_RCVBUF,(const char *)&recvbuf,sizeof(sendbuf)))
 154         {
 155                 //this->Instance->Log(DEFAULT, "Could not increase SO_SNDBUF/SO_RCVBUF for socket %u", GetFd());
 156                 ; // do nothing. I'm a little sick of people trying to interpret this message as a result of why their incorrect setups don't work.
 157         }
 158 }
 159
 160 /* Most irc servers require you to specify the ip you want to bind to.
 161  * If you dont specify an IP, they rather dumbly bind to the first IP
 162  * of the box (e.g. INADDR_ANY). In InspIRCd, we scan thought the IP
 163  * addresses we've bound server ports to, and we try and bind our outbound
 164  * connections to the first usable non-loopback and non-any IP we find.
 165  * This is easier to configure when you have a lot of links and a lot
 166  * of servers to configure.
 167  */
 168 bool BufferedSocket::BindAddr(const std::string &ip)
 169 {
 170         ConfigReader Conf(this->Instance);
 171         socklen_t size = sizeof(sockaddr_in);
 172 #ifdef IPV6
 173         bool v6 = false;
 174         /* Are we looking for a binding to fit an ipv6 host? */
 175         if ((ip.empty()) || (ip.find(':') != std::string::npos))
 176                 v6 = true;
 177 #endif
 178         int j = 0;
 179         while (j < Conf.Enumerate("bind") || (!ip.empty()))
 180         {
 181                 std::string IP = ip.empty() ? Conf.ReadValue("bind","address",j) : ip;
 182                 if (!ip.empty() || Conf.ReadValue("bind","type",j) == "servers")
 183                 {
 184                         if (!ip.empty() || ((IP != "*") && (IP != "127.0.0.1") && (!IP.empty()) && (IP != "::1")))
 185                         {
 186                                 /* The [2] is required because we may write a sockaddr_in6 here, and sockaddr_in6 is larger than sockaddr, where sockaddr_in4 is not. */
 187                                 sockaddr* s = new sockaddr[2];
 188 #ifdef IPV6
 189                                 if (v6)
 190                                 {
 191                                         in6_addr n;
 192                                         if (inet_pton(AF_INET6, IP.c_str(), &n) > 0)
 193                                         {
 194                                                 memcpy(&((sockaddr_in6*)s)->sin6_addr, &n, sizeof(sockaddr_in6));
 195                                                 ((sockaddr_in6*)s)->sin6_port = 0;
 196                                                 ((sockaddr_in6*)s)->sin6_family = AF_INET6;
 197                                                 size = sizeof(sockaddr_in6);
 198                                         }
 199                                         else
 200                                         {
 201                                                 delete[] s;
 202                                                 j++;
 203                                                 continue;
 204                                         }
 205                                 }
 206                                 else
 207 #endif
 208                                 {
 209                                         in_addr n;
 210                                         if (inet_aton(IP.c_str(), &n) > 0)
 211                                         {
 212                                                 ((sockaddr_in*)s)->sin_addr = n;
 213                                                 ((sockaddr_in*)s)->sin_port = 0;
 214                                                 ((sockaddr_in*)s)->sin_family = AF_INET;
 215                                         }
 216                                         else
 217                                         {
 218                                                 delete[] s;
 219                                                 j++;
 220                                                 continue;
 221                                         }
 222                                 }
 223
 224                                 if (Instance->SE->Bind(this->fd, s, size) < 0)
 225                                 {
 226                                         this->state = I_ERROR;
 227                                         this->OnError(I_ERR_BIND);
 228                                         this->fd = -1;
 229                                         delete[] s;
 230                                         return false;
 231                                 }
 232
 233                                 delete[] s;
 234                                 return true;
 235                         }
 236                 }
 237                 j++;
 238         }
 239         return true;
 240 }
 241
 242 bool BufferedSocket::DoConnect()
 243 {
 244         /* The [2] is required because we may write a sockaddr_in6 here, and sockaddr_in6 is larger than sockaddr, where sockaddr_in4 is not. */
 245         sockaddr* addr = new sockaddr[2];
 246         socklen_t size = sizeof(sockaddr_in);
 247 #ifdef IPV6
 248         bool v6 = false;
 249         if ((!*this->host) || strchr(this->host, ':'))
 250                 v6 = true;
 251
 252         if (v6)
 253         {
 254                 this->fd = socket(AF_INET6, SOCK_STREAM, 0);
 255                 if ((this->fd > -1) && ((strstr(this->IP,"::ffff:") != (char*)&this->IP) && (strstr(this->IP,"::FFFF:") != (char*)&this->IP)))
 256                 {
 257                         if (!this->BindAddr(this->cbindip))
 258                         {
 259                                 delete[] addr;
 260                                 return false;
 261                         }
 262                 }
 263         }
 264         else
 265 #endif
 266         {
 267                 this->fd = socket(AF_INET, SOCK_STREAM, 0);
 268                 if (this->fd > -1)
 269                 {
 270                         if (!this->BindAddr(this->cbindip))
 271                         {
 272                                 delete[] addr;
 273                                 return false;
 274                         }
 275                 }
 276         }
 277
 278         if (this->fd == -1)
 279         {
 280                 this->state = I_ERROR;
 281                 this->OnError(I_ERR_SOCKET);
 282                 delete[] addr;
 283                 return false;
 284         }
 285
 286 #ifdef IPV6
 287         if (v6)
 288         {
 289                 in6_addr addy;
 290                 if (inet_pton(AF_INET6, this->host, &addy) > 0)
 291                 {
 292                         ((sockaddr_in6*)addr)->sin6_family = AF_INET6;
 293                         memcpy(&((sockaddr_in6*)addr)->sin6_addr, &addy, sizeof(addy));
 294                         ((sockaddr_in6*)addr)->sin6_port = htons(this->port);
 295                         size = sizeof(sockaddr_in6);
 296                 }
 297         }
 298         else
 299 #endif
 300         {
 301                 in_addr addy;
 302                 if (inet_aton(this->host, &addy) > 0)
 303                 {
 304                         ((sockaddr_in*)addr)->sin_family = AF_INET;
 305                         ((sockaddr_in*)addr)->sin_addr = addy;
 306                         ((sockaddr_in*)addr)->sin_port = htons(this->port);
 307                 }
 308         }
 309
 310         Instance->SE->NonBlocking(this->fd);
 311
 312 #ifdef WIN32
 313         /* UGH for the LOVE OF ZOMBIE JESUS SOMEONE FIX THIS!!!!!!!!!!! */
 314         Instance->SE->Blocking(this->fd);
 315 #endif
 316
 317         if (Instance->SE->Connect(this, (sockaddr*)addr, size) == -1)
 318         {
 319                 if (errno != EINPROGRESS)
 320                 {
 321                         this->OnError(I_ERR_CONNECT);
 322                         this->Close();
 323                         this->state = I_ERROR;
 324                         return false;
 325                 }
 326
 327                 this->Timeout = new SocketTimeout(this->GetFd(), this->Instance, this, timeout_val, this->Instance->Time());
 328                 this->Instance->Timers->AddTimer(this->Timeout);
 329         }
 330 #ifdef WIN32
 331         /* CRAQ SMOKING STUFF TO BE FIXED */
 332         Instance->SE->NonBlocking(this->fd);
 333 #endif
 334         this->state = I_CONNECTING;
 335         if (this->fd > -1)
 336         {
 337                 if (!this->Instance->SE->AddFd(this))
 338                 {
 339                         this->OnError(I_ERR_NOMOREFDS);
 340                         this->Close();
 341                         this->state = I_ERROR;
 342                         return false;
 343                 }
 344                 this->SetQueues(this->fd);
 345         }
 346
 347         Instance->Log(DEBUG,"BufferedSocket::DoConnect success");
 348         return true;
 349 }
 350
 351
 352 void BufferedSocket::Close()
 353 {
 354         /* Save this, so we dont lose it,
 355          * otherise on failure, error messages
 356          * might be inaccurate.
 357          */
 358         int save = errno;
 359         if (this->fd > -1)
 360         {
 361                 if (this->IsIOHooked && Instance->Config->GetIOHook(this))
 362                 {
 363                         try
 364                         {
 365                                 Instance->Config->GetIOHook(this)->OnRawSocketClose(this->fd);
 366                         }
 367                         catch (CoreException& modexcept)
 368                         {
 369                                 Instance->Log(DEFAULT,"%s threw an exception: %s", modexcept.GetSource(), modexcept.GetReason());
 370                         }
 371                 }
 372                 Instance->SE->Shutdown(this, 2);
 373                 if (Instance->SE->Close(this) != -1)
 374                         this->OnClose();
 375
 376                 if (Instance->SocketCull.find(this) == Instance->SocketCull.end())
 377                         Instance->SocketCull[this] = this;
 378         }
 379         errno = save;
 380 }
 381
 382 std::string BufferedSocket::GetIP()
 383 {
 384         return this->IP;
 385 }
 386
 387 char* BufferedSocket::Read()
 388 {
 389         if (!Instance->SE->BoundsCheckFd(this))
 390                 return NULL;
 391
 392         int n = 0;
 393
 394         if (this->IsIOHooked)
 395         {
 396                 int result2 = 0;
 397                 int MOD_RESULT = 0;
 398                 try
 399                 {
 400                         MOD_RESULT = Instance->Config->GetIOHook(this)->OnRawSocketRead(this->fd,this->ibuf,sizeof(this->ibuf),result2);
 401                 }
 402                 catch (CoreException& modexcept)
 403                 {
 404                         Instance->Log(DEFAULT,"%s threw an exception: %s", modexcept.GetSource(), modexcept.GetReason());
 405                 }
 406                 if (MOD_RESULT < 0)
 407                 {
 408                         n = -1;
 409                         errno = EAGAIN;
 410                 }
 411                 else
 412                 {
 413                         n = result2;
 414                 }
 415         }
 416         else
 417         {
 418                 n = recv(this->fd,this->ibuf,sizeof(this->ibuf),0);
 419         }
 420
 421         if ((n > 0) && (n <= (int)sizeof(this->ibuf)))
 422         {
 423                 ibuf[n] = 0;
 424                 return ibuf;
 425         }
 426         else
 427         {
 428                 int err = errno;
 429                 if (err == EAGAIN)
 430                         return "";
 431                 else
 432                         return NULL;
 433         }
 434 }
 435
 436 void BufferedSocket::MarkAsClosed()
 437 {
 438 }
 439
 440 // There are two possible outcomes to this function.
 441 // It will either write all of the data, or an undefined amount.
 442 // If an undefined amount is written the connection has failed
 443 // and should be aborted.
 444 int BufferedSocket::Write(const std::string &data)
 445 {
 446         /* Try and append the data to the back of the queue, and send it on its way
 447          */
 448         outbuffer.push_back(data);
 449         this->Instance->SE->WantWrite(this);
 450         return (!this->FlushWriteBuffer());
 451 }
 452
 453 bool BufferedSocket::FlushWriteBuffer()
 454 {
 455         errno = 0;
 456         if ((this->fd > -1) && (this->state == I_CONNECTED))
 457         {
 458                 if (this->IsIOHooked)
 459                 {
 460                         while (outbuffer.size() && (errno != EAGAIN))
 461                         {
 462                                 try
 463                                 {
 464                                         /* XXX: The lack of buffering here is NOT a bug, modules implementing this interface have to
 465                                          * implement their own buffering mechanisms
 466                                          */
 467                                         Instance->Config->GetIOHook(this)->OnRawSocketWrite(this->fd, outbuffer[0].c_str(), outbuffer[0].length());
 468                                         outbuffer.pop_front();
 469                                 }
 470                                 catch (CoreException& modexcept)
 471                                 {
 472                                         Instance->Log(DEBUG,"%s threw an exception: %s", modexcept.GetSource(), modexcept.GetReason());
 473                                         return true;
 474                                 }
 475                         }
 476                 }
 477                 else
 478                 {
 479                         /* If we have multiple lines, try to send them all,
 480                          * not just the first one -- Brain
 481                          */
 482                         while (outbuffer.size() && (errno != EAGAIN))
 483                         {
 484                                 /* Send a line */
 485                                 int result = Instance->SE->Send(this, outbuffer[0].c_str(), outbuffer[0].length(), 0);
 486
 487                                 if (result > 0)
 488                                 {
 489                                         if ((unsigned int)result >= outbuffer[0].length())
 490                                         {
 491                                                 /* The whole block was written (usually a line)
 492                                                  * Pop the block off the front of the queue,
 493                                                  * dont set errno, because we are clear of errors
 494                                                  * and want to try and write the next block too.
 495                                                  */
 496                                                 outbuffer.pop_front();
 497                                         }
 498                                         else
 499                                         {
 500                                                 std::string temp = outbuffer[0].substr(result);
 501                                                 outbuffer[0] = temp;
 502                                                 /* We didnt get the whole line out. arses.
 503                                                  * Try again next time, i guess. Set errno,
 504                                                  * because we shouldnt be writing any more now,
 505                                                  * until the socketengine says its safe to do so.
 506                                                  */
 507                                                 errno = EAGAIN;
 508                                         }
 509                                 }
 510                                 else if (result == 0)
 511                                 {
 512                                         this->Instance->SE->DelFd(this);
 513                                         this->Close();
 514                                         return true;
 515                                 }
 516                                 else if ((result == -1) && (errno != EAGAIN))
 517                                 {
 518                                         this->OnError(I_ERR_WRITE);
 519                                         this->state = I_ERROR;
 520                                         this->Instance->SE->DelFd(this);
 521                                         this->Close();
 522                                         return true;
 523                                 }
 524                         }
 525                 }
 526         }
 527
 528         if ((errno == EAGAIN) && (fd > -1))
 529         {
 530                 this->Instance->SE->WantWrite(this);
 531         }
 532
 533         return (fd < 0);
 534 }
 535
 536 void SocketTimeout::Tick(time_t)
 537 {
 538         if (ServerInstance->SE->GetRef(this->sfd) != this->sock)
 539                 return;
 540
 541         if (this->sock->state == I_CONNECTING)
 542         {
 543                 // for non-listening sockets, the timeout can occur
 544                 // which causes termination of the connection after
 545                 // the given number of seconds without a successful
 546                 // connection.
 547                 this->sock->OnTimeout();
 548                 this->sock->OnError(I_ERR_TIMEOUT);
 549                 this->sock->timeout = true;
 550
 551                 /* NOTE: We must set this AFTER DelFd, as we added
 552                  * this socket whilst writeable. This means that we
 553                  * must DELETE the socket whilst writeable too!
 554                  */
 555                 this->sock->state = I_ERROR;
 556
 557                 if (ServerInstance->SocketCull.find(this->sock) == ServerInstance->SocketCull.end())
 558                         ServerInstance->SocketCull[this->sock] = this->sock;
 559         }
 560
 561         this->sock->Timeout = NULL;
 562 }
 563
 564 bool BufferedSocket::Poll()
 565 {
 566         int incoming = -1;
 567
 568 #ifndef WINDOWS
 569         if (!Instance->SE->BoundsCheckFd(this))
 570                 return false;
 571 #endif
 572
 573         if (Instance->SE->GetRef(this->fd) != this)
 574                 return false;
 575
 576         switch (this->state)
 577         {
 578                 case I_CONNECTING:
 579                         /* Our socket was in write-state, so delete it and re-add it
 580                          * in read-state.
 581                          */
 582 #ifndef WINDOWS
 583                         if (this->fd > -1)
 584                         {
 585                                 this->Instance->SE->DelFd(this);
 586                                 if (!this->Instance->SE->AddFd(this))
 587                                         return false;
 588                         }
 589 #endif
 590                         this->SetState(I_CONNECTED);
 591
 592                         if (Instance->Config->GetIOHook(this))
 593                         {
 594                                 Instance->Log(DEBUG,"Hook for raw connect");
 595                                 try
 596                                 {
 597                                         Instance->Config->GetIOHook(this)->OnRawSocketConnect(this->fd);
 598                                 }
 599                                 catch (CoreException& modexcept)
 600                                 {
 601                                         Instance->Log(DEBUG,"%s threw an exception: %s", modexcept.GetSource(), modexcept.GetReason());
 602                                 }
 603                         }
 604                         return this->OnConnected();
 605                 break;
 606                 case I_LISTENING:
 607                 {
 608                         /* The [2] is required because we may write a sockaddr_in6 here, and sockaddr_in6 is larger than sockaddr, where sockaddr_in4 is not. */
 609                         sockaddr* client = new sockaddr[2];
 610                         length = sizeof (sockaddr_in);
 611                         std::string recvip;
 612 #ifdef IPV6
 613                         if ((!*this->host) || strchr(this->host, ':'))
 614                                 length = sizeof(sockaddr_in6);
 615 #endif
 616                         incoming = Instance->SE->Accept(this, client, &length);
 617 #ifdef IPV6
 618                         if ((!*this->host) || strchr(this->host, ':'))
 619                         {
 620                                 char buf[1024];
 621                                 recvip = inet_ntop(AF_INET6, &((sockaddr_in6*)client)->sin6_addr, buf, sizeof(buf));
 622                         }
 623                         else
 624 #endif
 625                         Instance->SE->NonBlocking(incoming);
 626
 627                         recvip = inet_ntoa(((sockaddr_in*)client)->sin_addr);
 628                         this->OnIncomingConnection(incoming, (char*)recvip.c_str());
 629
 630                         if (this->IsIOHooked)
 631                         {
 632                                 try
 633                                 {
 634                                         Instance->Config->GetIOHook(this)->OnRawSocketAccept(incoming, recvip.c_str(), this->port);
 635                                 }
 636                                 catch (CoreException& modexcept)
 637                                 {
 638                                         Instance->Log(DEBUG,"%s threw an exception: %s", modexcept.GetSource(), modexcept.GetReason());
 639                                 }
 640                         }
 641
 642                         this->SetQueues(incoming);
 643
 644                         delete[] client;
 645                         return true;
 646                 }
 647                 break;
 648                 case I_CONNECTED:
 649                         /* Process the read event */
 650                         return this->OnDataReady();
 651                 break;
 652                 default:
 653                 break;
 654         }
 655         return true;
 656 }
 657
 658 void BufferedSocket::SetState(BufferedSocketState s)
 659 {
 660         this->state = s;
 661 }
 662
 663 BufferedSocketState BufferedSocket::GetState()
 664 {
 665         return this->state;
 666 }
 667
 668 int BufferedSocket::GetFd()
 669 {
 670         return this->fd;
 671 }
 672
 673 bool BufferedSocket::OnConnected() { return true; }
 674 void BufferedSocket::OnError(BufferedSocketError) { return; }
 675 int BufferedSocket::OnDisconnect() { return 0; }
 676 int BufferedSocket::OnIncomingConnection(int, char*) { return 0; }
 677 bool BufferedSocket::OnDataReady() { return true; }
 678 bool BufferedSocket::OnWriteReady() { return true; }
 679 void BufferedSocket::OnTimeout() { return; }
 680 void BufferedSocket::OnClose() { return; }
 681
 682 BufferedSocket::~BufferedSocket()
 683 {
 684         this->Close();
 685         if (Timeout)
 686         {
 687                 Instance->Timers->DelTimer(Timeout);
 688                 Timeout = NULL;
 689         }
 690 }
 691
 692 void BufferedSocket::HandleEvent(EventType et, int errornum)
 693 {
 694         switch (et)
 695         {
 696                 case EVENT_ERROR:
 697                         switch (errornum)
 698                         {
 699                                 case ETIMEDOUT:
 700                                         this->OnError(I_ERR_TIMEOUT);
 701                                 break;
 702                                 case ECONNREFUSED:
 703                                 case 0:
 704                                         this->OnError(this->state == I_CONNECTING ? I_ERR_CONNECT : I_ERR_WRITE);
 705                                 break;
 706                                 case EADDRINUSE:
 707                                         this->OnError(I_ERR_BIND);
 708                                 break;
 709                                 case EPIPE:
 710                                 case EIO:
 711                                         this->OnError(I_ERR_WRITE);
 712                                 break;
 713                         }
 714                         if (this->Instance->SocketCull.find(this) == this->Instance->SocketCull.end())
 715                                 this->Instance->SocketCull[this] = this;
 716                         return;
 717                 break;
 718                 case EVENT_READ:
 719                         if (!this->Poll())
 720                         {
 721                                 if (this->Instance->SocketCull.find(this) == this->Instance->SocketCull.end())
 722                                         this->Instance->SocketCull[this] = this;
 723                                 return;
 724                         }
 725                 break;
 726                 case EVENT_WRITE:
 727                         if (this->WaitingForWriteEvent)
 728                         {
 729                                 this->WaitingForWriteEvent = false;
 730                                 if (!this->OnWriteReady())
 731                                 {
 732                                         if (this->Instance->SocketCull.find(this) == this->Instance->SocketCull.end())
 733                                                 this->Instance->SocketCull[this] = this;
 734                                         return;
 735                                 }
 736                         }
 737                         if (this->state == I_CONNECTING)
 738                         {
 739                                 /* This might look wrong as if we should be actually calling
 740                                  * with EVENT_WRITE, but trust me it is correct. There are some
 741                                  * writeability-state things in the read code, because of how
 742                                  * BufferedSocket used to work regarding write buffering in previous
 743                                  * versions of InspIRCd. - Brain
 744                                  */
 745                                 this->HandleEvent(EVENT_READ);
 746                                 return;
 747                         }
 748                         else
 749                         {
 750                                 if (this->FlushWriteBuffer())
 751                                 {
 752                                         if (this->Instance->SocketCull.find(this) == this->Instance->SocketCull.end())
 753                                                 this->Instance->SocketCull[this] = this;
 754                                         return;
 755                                 }
 756                         }
 757                 break;
 758         }
 759 }
 760