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