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         return true;
 347 }
 348
 349
 350 void BufferedSocket::Close()
 351 {
 352         /* Save this, so we dont lose it,
 353          * otherise on failure, error messages
 354          * might be inaccurate.
 355          */
 356         int save = errno;
 357         if (this->fd > -1)
 358         {
 359                 if (this->IsIOHooked && Instance->Config->GetIOHook(this))
 360                 {
 361                         try
 362                         {
 363                                 Instance->Config->GetIOHook(this)->OnRawSocketClose(this->fd);
 364                         }
 365                         catch (CoreException& modexcept)
 366                         {
 367                                 Instance->Log(DEFAULT,"%s threw an exception: %s", modexcept.GetSource(), modexcept.GetReason());
 368                         }
 369                 }
 370                 Instance->SE->Shutdown(this, 2);
 371                 if (Instance->SE->Close(this) != -1)
 372                         this->OnClose();
 373
 374                 if (Instance->SocketCull.find(this) == Instance->SocketCull.end())
 375                         Instance->SocketCull[this] = this;
 376         }
 377         errno = save;
 378 }
 379
 380 std::string BufferedSocket::GetIP()
 381 {
 382         return this->IP;
 383 }
 384
 385 char* BufferedSocket::Read()
 386 {
 387         if (!Instance->SE->BoundsCheckFd(this))
 388                 return NULL;
 389
 390         int n = 0;
 391
 392         if (this->IsIOHooked)
 393         {
 394                 int result2 = 0;
 395                 int MOD_RESULT = 0;
 396                 try
 397                 {
 398                         MOD_RESULT = Instance->Config->GetIOHook(this)->OnRawSocketRead(this->fd,this->ibuf,sizeof(this->ibuf),result2);
 399                 }
 400                 catch (CoreException& modexcept)
 401                 {
 402                         Instance->Log(DEFAULT,"%s threw an exception: %s", modexcept.GetSource(), modexcept.GetReason());
 403                 }
 404                 if (MOD_RESULT < 0)
 405                 {
 406                         n = -1;
 407                         errno = EAGAIN;
 408                 }
 409                 else
 410                 {
 411                         n = result2;
 412                 }
 413         }
 414         else
 415         {
 416                 n = recv(this->fd,this->ibuf,sizeof(this->ibuf),0);
 417         }
 418
 419         if ((n > 0) && (n <= (int)sizeof(this->ibuf)))
 420         {
 421                 ibuf[n] = 0;
 422                 return ibuf;
 423         }
 424         else
 425         {
 426                 int err = errno;
 427                 if (err == EAGAIN)
 428                         return "";
 429                 else
 430                         return NULL;
 431         }
 432 }
 433
 434 void BufferedSocket::MarkAsClosed()
 435 {
 436 }
 437
 438 // There are two possible outcomes to this function.
 439 // It will either write all of the data, or an undefined amount.
 440 // If an undefined amount is written the connection has failed
 441 // and should be aborted.
 442 int BufferedSocket::Write(const std::string &data)
 443 {
 444         /* Try and append the data to the back of the queue, and send it on its way
 445          */
 446         outbuffer.push_back(data);
 447         this->Instance->SE->WantWrite(this);
 448         return (!this->FlushWriteBuffer());
 449 }
 450
 451 bool BufferedSocket::FlushWriteBuffer()
 452 {
 453         errno = 0;
 454         if ((this->fd > -1) && (this->state == I_CONNECTED))
 455         {
 456                 if (this->IsIOHooked)
 457                 {
 458                         while (outbuffer.size() && (errno != EAGAIN))
 459                         {
 460                                 try
 461                                 {
 462                                         /* XXX: The lack of buffering here is NOT a bug, modules implementing this interface have to
 463                                          * implement their own buffering mechanisms
 464                                          */
 465                                         Instance->Config->GetIOHook(this)->OnRawSocketWrite(this->fd, outbuffer[0].c_str(), outbuffer[0].length());
 466                                         outbuffer.pop_front();
 467                                 }
 468                                 catch (CoreException& modexcept)
 469                                 {
 470                                         Instance->Log(DEBUG,"%s threw an exception: %s", modexcept.GetSource(), modexcept.GetReason());
 471                                         return true;
 472                                 }
 473                         }
 474                 }
 475                 else
 476                 {
 477                         /* If we have multiple lines, try to send them all,
 478                          * not just the first one -- Brain
 479                          */
 480                         while (outbuffer.size() && (errno != EAGAIN))
 481                         {
 482                                 /* Send a line */
 483                                 int result = Instance->SE->Send(this, outbuffer[0].c_str(), outbuffer[0].length(), 0);
 484
 485                                 if (result > 0)
 486                                 {
 487                                         if ((unsigned int)result >= outbuffer[0].length())
 488                                         {
 489                                                 /* The whole block was written (usually a line)
 490                                                  * Pop the block off the front of the queue,
 491                                                  * dont set errno, because we are clear of errors
 492                                                  * and want to try and write the next block too.
 493                                                  */
 494                                                 outbuffer.pop_front();
 495                                         }
 496                                         else
 497                                         {
 498                                                 std::string temp = outbuffer[0].substr(result);
 499                                                 outbuffer[0] = temp;
 500                                                 /* We didnt get the whole line out. arses.
 501                                                  * Try again next time, i guess. Set errno,
 502                                                  * because we shouldnt be writing any more now,
 503                                                  * until the socketengine says its safe to do so.
 504                                                  */
 505                                                 errno = EAGAIN;
 506                                         }
 507                                 }
 508                                 else if (result == 0)
 509                                 {
 510                                         this->Instance->SE->DelFd(this);
 511                                         this->Close();
 512                                         return true;
 513                                 }
 514                                 else if ((result == -1) && (errno != EAGAIN))
 515                                 {
 516                                         this->OnError(I_ERR_WRITE);
 517                                         this->state = I_ERROR;
 518                                         this->Instance->SE->DelFd(this);
 519                                         this->Close();
 520                                         return true;
 521                                 }
 522                         }
 523                 }
 524         }
 525
 526         if ((errno == EAGAIN) && (fd > -1))
 527         {
 528                 this->Instance->SE->WantWrite(this);
 529         }
 530
 531         return (fd < 0);
 532 }
 533
 534 void SocketTimeout::Tick(time_t)
 535 {
 536         if (ServerInstance->SE->GetRef(this->sfd) != this->sock)
 537                 return;
 538
 539         if (this->sock->state == I_CONNECTING)
 540         {
 541                 // for non-listening sockets, the timeout can occur
 542                 // which causes termination of the connection after
 543                 // the given number of seconds without a successful
 544                 // connection.
 545                 this->sock->OnTimeout();
 546                 this->sock->OnError(I_ERR_TIMEOUT);
 547                 this->sock->timeout = true;
 548
 549                 /* NOTE: We must set this AFTER DelFd, as we added
 550                  * this socket whilst writeable. This means that we
 551                  * must DELETE the socket whilst writeable too!
 552                  */
 553                 this->sock->state = I_ERROR;
 554
 555                 if (ServerInstance->SocketCull.find(this->sock) == ServerInstance->SocketCull.end())
 556                         ServerInstance->SocketCull[this->sock] = this->sock;
 557         }
 558
 559         this->sock->Timeout = NULL;
 560 }
 561
 562 bool BufferedSocket::Poll()
 563 {
 564         int incoming = -1;
 565
 566 #ifndef WINDOWS
 567         if (!Instance->SE->BoundsCheckFd(this))
 568                 return false;
 569 #endif
 570
 571         if (Instance->SE->GetRef(this->fd) != this)
 572                 return false;
 573
 574         switch (this->state)
 575         {
 576                 case I_CONNECTING:
 577                         /* Our socket was in write-state, so delete it and re-add it
 578                          * in read-state.
 579                          */
 580 #ifndef WINDOWS
 581                         if (this->fd > -1)
 582                         {
 583                                 this->Instance->SE->DelFd(this);
 584                                 if (!this->Instance->SE->AddFd(this))
 585                                         return false;
 586                         }
 587 #endif
 588                         this->SetState(I_CONNECTED);
 589
 590                         if (Instance->Config->GetIOHook(this))
 591                         {
 592                                 Instance->Log(DEBUG,"Hook for raw connect");
 593                                 try
 594                                 {
 595                                         Instance->Config->GetIOHook(this)->OnRawSocketConnect(this->fd);
 596                                 }
 597                                 catch (CoreException& modexcept)
 598                                 {
 599                                         Instance->Log(DEBUG,"%s threw an exception: %s", modexcept.GetSource(), modexcept.GetReason());
 600                                 }
 601                         }
 602                         return this->OnConnected();
 603                 break;
 604                 case I_LISTENING:
 605                 {
 606                         /* The [2] is required because we may write a sockaddr_in6 here, and sockaddr_in6 is larger than sockaddr, where sockaddr_in4 is not. */
 607                         sockaddr* client = new sockaddr[2];
 608                         length = sizeof (sockaddr_in);
 609                         std::string recvip;
 610 #ifdef IPV6
 611                         if ((!*this->host) || strchr(this->host, ':'))
 612                                 length = sizeof(sockaddr_in6);
 613 #endif
 614                         incoming = Instance->SE->Accept(this, client, &length);
 615 #ifdef IPV6
 616                         if ((!*this->host) || strchr(this->host, ':'))
 617                         {
 618                                 char buf[1024];
 619                                 recvip = inet_ntop(AF_INET6, &((sockaddr_in6*)client)->sin6_addr, buf, sizeof(buf));
 620                         }
 621                         else
 622 #endif
 623                         Instance->SE->NonBlocking(incoming);
 624
 625                         recvip = inet_ntoa(((sockaddr_in*)client)->sin_addr);
 626                         this->OnIncomingConnection(incoming, (char*)recvip.c_str());
 627
 628                         if (this->IsIOHooked)
 629                         {
 630                                 try
 631                                 {
 632                                         Instance->Config->GetIOHook(this)->OnRawSocketAccept(incoming, recvip.c_str(), this->port);
 633                                 }
 634                                 catch (CoreException& modexcept)
 635                                 {
 636                                         Instance->Log(DEBUG,"%s threw an exception: %s", modexcept.GetSource(), modexcept.GetReason());
 637                                 }
 638                         }
 639
 640                         this->SetQueues(incoming);
 641
 642                         delete[] client;
 643                         return true;
 644                 }
 645                 break;
 646                 case I_CONNECTED:
 647                         /* Process the read event */
 648                         return this->OnDataReady();
 649                 break;
 650                 default:
 651                 break;
 652         }
 653         return true;
 654 }
 655
 656 void BufferedSocket::SetState(BufferedSocketState s)
 657 {
 658         this->state = s;
 659 }
 660
 661 BufferedSocketState BufferedSocket::GetState()
 662 {
 663         return this->state;
 664 }
 665
 666 int BufferedSocket::GetFd()
 667 {
 668         return this->fd;
 669 }
 670
 671 bool BufferedSocket::OnConnected() { return true; }
 672 void BufferedSocket::OnError(BufferedSocketError) { return; }
 673 int BufferedSocket::OnDisconnect() { return 0; }
 674 int BufferedSocket::OnIncomingConnection(int, char*) { return 0; }
 675 bool BufferedSocket::OnDataReady() { return true; }
 676 bool BufferedSocket::OnWriteReady() { return true; }
 677 void BufferedSocket::OnTimeout() { return; }
 678 void BufferedSocket::OnClose() { return; }
 679
 680 BufferedSocket::~BufferedSocket()
 681 {
 682         this->Close();
 683         if (Timeout)
 684         {
 685                 Instance->Timers->DelTimer(Timeout);
 686                 Timeout = NULL;
 687         }
 688 }
 689
 690 void BufferedSocket::HandleEvent(EventType et, int errornum)
 691 {
 692         switch (et)
 693         {
 694                 case EVENT_ERROR:
 695                         switch (errornum)
 696                         {
 697                                 case ETIMEDOUT:
 698                                         this->OnError(I_ERR_TIMEOUT);
 699                                 break;
 700                                 case ECONNREFUSED:
 701                                 case 0:
 702                                         this->OnError(this->state == I_CONNECTING ? I_ERR_CONNECT : I_ERR_WRITE);
 703                                 break;
 704                                 case EADDRINUSE:
 705                                         this->OnError(I_ERR_BIND);
 706                                 break;
 707                                 case EPIPE:
 708                                 case EIO:
 709                                         this->OnError(I_ERR_WRITE);
 710                                 break;
 711                         }
 712                         if (this->Instance->SocketCull.find(this) == this->Instance->SocketCull.end())
 713                                 this->Instance->SocketCull[this] = this;
 714                         return;
 715                 break;
 716                 case EVENT_READ:
 717                         if (!this->Poll())
 718                         {
 719                                 if (this->Instance->SocketCull.find(this) == this->Instance->SocketCull.end())
 720                                         this->Instance->SocketCull[this] = this;
 721                                 return;
 722                         }
 723                 break;
 724                 case EVENT_WRITE:
 725                         if (this->WaitingForWriteEvent)
 726                         {
 727                                 this->WaitingForWriteEvent = false;
 728                                 if (!this->OnWriteReady())
 729                                 {
 730                                         if (this->Instance->SocketCull.find(this) == this->Instance->SocketCull.end())
 731                                                 this->Instance->SocketCull[this] = this;
 732                                         return;
 733                                 }
 734                         }
 735                         if (this->state == I_CONNECTING)
 736                         {
 737                                 /* This might look wrong as if we should be actually calling
 738                                  * with EVENT_WRITE, but trust me it is correct. There are some
 739                                  * writeability-state things in the read code, because of how
 740                                  * BufferedSocket used to work regarding write buffering in previous
 741                                  * versions of InspIRCd. - Brain
 742                                  */
 743                                 this->HandleEvent(EVENT_READ);
 744                                 return;
 745                         }
 746                         else
 747                         {
 748                                 if (this->FlushWriteBuffer())
 749                                 {
 750                                         if (this->Instance->SocketCull.find(this) == this->Instance->SocketCull.end())
 751                                                 this->Instance->SocketCull[this] = this;
 752                                         return;
 753                                 }
 754                         }
 755                 break;
 756         }
 757 }
 758