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                                 sockaddr* s = new sockaddr[2];
 183 #ifdef IPV6
 184                                 if (v6)
 185                                 {
 186                                         in6_addr n;
 187                                         if (inet_pton(AF_INET6, IP.c_str(), &n) > 0)
 188                                         {
 189                                                 memcpy(&((sockaddr_in6*)s)->sin6_addr, &n, sizeof(n));
 190                                                 ((sockaddr_in6*)s)->sin6_port = 0;
 191                                                 ((sockaddr_in6*)s)->sin6_family = AF_INET6;
 192                                                 size = sizeof(sockaddr_in6);
 193                                         }
 194                                         else
 195                                         {
 196                                                 delete[] s;
 197                                                 j++;
 198                                                 continue;
 199                                         }
 200                                 }
 201                                 else
 202 #endif
 203                                 {
 204                                         in_addr n;
 205                                         if (inet_aton(IP.c_str(), &n) > 0)
 206                                         {
 207                                                 ((sockaddr_in*)s)->sin_addr = n;
 208                                                 ((sockaddr_in*)s)->sin_port = 0;
 209                                                 ((sockaddr_in*)s)->sin_family = AF_INET;
 210                                         }
 211                                         else
 212                                         {
 213                                                 delete[] s;
 214                                                 j++;
 215                                                 continue;
 216                                         }
 217                                 }
 218
 219                                 if (bind(this->fd, s, size) < 0)
 220                                 {
 221                                         this->state = I_ERROR;
 222                                         this->OnError(I_ERR_BIND);
 223                                         this->fd = -1;
 224                                         delete[] s;
 225                                         return false;
 226                                 }
 227
 228                                 delete[] s;
 229                                 return true;
 230                         }
 231                 }
 232                 j++;
 233         }
 234         return true;
 235 }
 236
 237 bool InspSocket::DoConnect()
 238 {
 239         sockaddr* addr = new sockaddr[2];
 240         socklen_t size = sizeof(sockaddr_in);
 241 #ifdef IPV6
 242         bool v6 = false;
 243         if ((!*this->host) || strchr(this->host, ':'))
 244                 v6 = true;
 245
 246         if (v6)
 247         {
 248                 this->fd = socket(AF_INET6, SOCK_STREAM, 0);
 249                 if ((this->fd > -1) && ((strstr(this->IP,"::ffff:") != (char*)&this->IP) && (strstr(this->IP,"::FFFF:") != (char*)&this->IP)))
 250                 {
 251                         if (!this->BindAddr(this->cbindip))
 252                         {
 253                                 delete[] addr;
 254                                 return false;
 255                         }
 256                 }
 257         }
 258         else
 259 #endif
 260         {
 261                 this->fd = socket(AF_INET, SOCK_STREAM, 0);
 262                 if (this->fd > -1)
 263                 {
 264                         if (!this->BindAddr(this->cbindip))
 265                         {
 266                                 delete[] addr;
 267                                 return false;
 268                         }
 269                 }
 270         }
 271
 272         if (this->fd == -1)
 273         {
 274                 this->state = I_ERROR;
 275                 this->OnError(I_ERR_SOCKET);
 276                 delete[] addr;
 277                 return false;
 278         }
 279
 280 #ifdef IPV6
 281         if (v6)
 282         {
 283                 in6_addr addy;
 284                 if (inet_pton(AF_INET6, this->host, &addy) > 0)
 285                 {
 286                         ((sockaddr_in6*)addr)->sin6_family = AF_INET6;
 287                         memcpy(&((sockaddr_in6*)addr)->sin6_addr, &addy, sizeof(addy));
 288                         ((sockaddr_in6*)addr)->sin6_port = htons(this->port);
 289                         size = sizeof(sockaddr_in6);
 290                 }
 291         }
 292         else
 293 #endif
 294         {
 295                 in_addr addy;
 296                 if (inet_aton(this->host, &addy) > 0)
 297                 {
 298                         ((sockaddr_in*)addr)->sin_family = AF_INET;
 299                         ((sockaddr_in*)addr)->sin_addr = addy;
 300                         ((sockaddr_in*)addr)->sin_port = htons(this->port);
 301                 }
 302         }
 303 #ifndef WIN32
 304         int flags = fcntl(this->fd, F_GETFL, 0);
 305         fcntl(this->fd, F_SETFL, flags | O_NONBLOCK);
 306 #else
 307         unsigned long flags = 0;
 308         ioctlsocket(this->fd, FIONBIO, &flags);
 309 #endif
 310         if (connect(this->fd, (sockaddr*)addr, size) == -1)
 311         {
 312                 if (errno != EINPROGRESS)
 313                 {
 314                         this->OnError(I_ERR_CONNECT);
 315                         this->Close();
 316                         this->state = I_ERROR;
 317                         return false;
 318                 }
 319
 320                 this->Timeout = new SocketTimeout(this->GetFd(), this->Instance, this, timeout_val, this->Instance->Time());
 321                 this->Instance->Timers->AddTimer(this->Timeout);
 322         }
 323 #ifdef WIN32
 324         /* Set nonblocking mode after the connect() call */
 325         flags = 0;
 326         ioctlsocket(this->fd, FIONBIO, &flags);
 327 #endif
 328         this->state = I_CONNECTING;
 329         if (this->fd > -1)
 330         {
 331                 if (!this->Instance->SE->AddFd(this))
 332                 {
 333                         this->OnError(I_ERR_NOMOREFDS);
 334                         this->Close();
 335                         this->state = I_ERROR;
 336                         return false;
 337                 }
 338                 this->SetQueues(this->fd);
 339         }
 340         return true;
 341 }
 342
 343
 344 void InspSocket::Close()
 345 {
 346         /* Save this, so we dont lose it,
 347          * otherise on failure, error messages
 348          * might be inaccurate.
 349          */
 350         int save = errno;
 351         if (this->fd > -1)
 352         {
 353                 if (this->IsIOHooked && Instance->Config->GetIOHook(this))
 354                 {
 355                         try
 356                         {
 357                                 Instance->Config->GetIOHook(this)->OnRawSocketClose(this->fd);
 358                         }
 359                         catch (CoreException& modexcept)
 360                         {
 361                                 Instance->Log(DEFAULT,"%s threw an exception: %s", modexcept.GetSource(), modexcept.GetReason());
 362                         }
 363                 }
 364                 shutdown(this->fd,2);
 365                 if (close(this->fd) != -1)
 366                         this->OnClose();
 367
 368                 if (Instance->SocketCull.find(this) == Instance->SocketCull.end())
 369                         Instance->SocketCull[this] = this;
 370         }
 371         errno = save;
 372 }
 373
 374 std::string InspSocket::GetIP()
 375 {
 376         return this->IP;
 377 }
 378
 379 char* InspSocket::Read()
 380 {
 381 #ifdef WINDOWS
 382         if ((fd < 0) || (m_internalFd > MAX_DESCRIPTORS))
 383 #else
 384         if ((fd < 0) || (fd > MAX_DESCRIPTORS))
 385 #endif
 386                 return NULL;
 387
 388         int n = 0;
 389
 390         if (this->IsIOHooked)
 391         {
 392                 int result2 = 0;
 393                 int MOD_RESULT = 0;
 394                 try
 395                 {
 396                         MOD_RESULT = Instance->Config->GetIOHook(this)->OnRawSocketRead(this->fd,this->ibuf,sizeof(this->ibuf),result2);
 397                 }
 398                 catch (CoreException& modexcept)
 399                 {
 400                         Instance->Log(DEFAULT,"%s threw an exception: %s", modexcept.GetSource(), modexcept.GetReason());
 401                 }
 402                 if (MOD_RESULT < 0)
 403                 {
 404                         n = -1;
 405                         errno = EAGAIN;
 406                 }
 407                 else
 408                 {
 409                         n = result2;
 410                 }
 411         }
 412         else
 413         {
 414                 n = recv(this->fd,this->ibuf,sizeof(this->ibuf),0);
 415         }
 416
 417         if ((n > 0) && (n <= (int)sizeof(this->ibuf)))
 418         {
 419                 ibuf[n] = 0;
 420                 return ibuf;
 421         }
 422         else
 423         {
 424                 int err = errno;
 425                 if (err == EAGAIN)
 426                         return "";
 427                 else
 428                         return NULL;
 429         }
 430 }
 431
 432 void InspSocket::MarkAsClosed()
 433 {
 434 }
 435
 436 // There are two possible outcomes to this function.
 437 // It will either write all of the data, or an undefined amount.
 438 // If an undefined amount is written the connection has failed
 439 // and should be aborted.
 440 int InspSocket::Write(const std::string &data)
 441 {
 442         /* Try and append the data to the back of the queue, and send it on its way
 443          */
 444         outbuffer.push_back(data);
 445         this->Instance->SE->WantWrite(this);
 446         return (!this->FlushWriteBuffer());
 447 }
 448
 449 bool InspSocket::FlushWriteBuffer()
 450 {
 451         errno = 0;
 452         if ((this->fd > -1) && (this->state == I_CONNECTED))
 453         {
 454                 if (this->IsIOHooked)
 455                 {
 456                         while (outbuffer.size() && (errno != EAGAIN))
 457                         {
 458                                 try
 459                                 {
 460                                         /* XXX: The lack of buffering here is NOT a bug, modules implementing this interface have to
 461                                          * implement their own buffering mechanisms
 462                                          */
 463                                         Instance->Config->GetIOHook(this)->OnRawSocketWrite(this->fd, outbuffer[0].c_str(), outbuffer[0].length());
 464                                         outbuffer.pop_front();
 465                                 }
 466                                 catch (CoreException& modexcept)
 467                                 {
 468                                         Instance->Log(DEBUG,"%s threw an exception: %s", modexcept.GetSource(), modexcept.GetReason());
 469                                         return true;
 470                                 }
 471                         }
 472                 }
 473                 else
 474                 {
 475                         /* If we have multiple lines, try to send them all,
 476                          * not just the first one -- Brain
 477                          */
 478                         while (outbuffer.size() && (errno != EAGAIN))
 479                         {
 480                                 /* Send a line */
 481 #ifndef WIN32
 482                                 int result = write(this->fd,outbuffer[0].c_str(),outbuffer[0].length());
 483 #else
 484                                 int result = send(this->fd,outbuffer[0].c_str(),outbuffer[0].length(), 0);
 485 #endif
 486                                 if (result > 0)
 487                                 {
 488                                         if ((unsigned int)result >= outbuffer[0].length())
 489                                         {
 490                                                 /* The whole block was written (usually a line)
 491                                                  * Pop the block off the front of the queue,
 492                                                  * dont set errno, because we are clear of errors
 493                                                  * and want to try and write the next block too.
 494                                                  */
 495                                                 outbuffer.pop_front();
 496                                         }
 497                                         else
 498                                         {
 499                                                 std::string temp = outbuffer[0].substr(result);
 500                                                 outbuffer[0] = temp;
 501                                                 /* We didnt get the whole line out. arses.
 502                                                  * Try again next time, i guess. Set errno,
 503                                                  * because we shouldnt be writing any more now,
 504                                                  * until the socketengine says its safe to do so.
 505                                                  */
 506                                                 errno = EAGAIN;
 507                                         }
 508                                 }
 509                                 else if ((result == -1) && (errno != EAGAIN))
 510                                 {
 511                                         this->OnError(I_ERR_WRITE);
 512                                         this->state = I_ERROR;
 513                                         this->Instance->SE->DelFd(this);
 514                                         this->Close();
 515                                         return true;
 516                                 }
 517                         }
 518                 }
 519         }
 520
 521         if ((errno == EAGAIN) && (fd > -1))
 522         {
 523                 this->Instance->SE->WantWrite(this);
 524         }
 525
 526         return (fd < 0);
 527 }
 528
 529 void SocketTimeout::Tick(time_t now)
 530 {
 531         if (ServerInstance->SE->GetRef(this->sfd) != this->sock)
 532                 return;
 533
 534         if (this->sock->state == I_CONNECTING)
 535         {
 536                 // for non-listening sockets, the timeout can occur
 537                 // which causes termination of the connection after
 538                 // the given number of seconds without a successful
 539                 // connection.
 540                 this->sock->OnTimeout();
 541                 this->sock->OnError(I_ERR_TIMEOUT);
 542                 this->sock->timeout = true;
 543
 544                 /* NOTE: We must set this AFTER DelFd, as we added
 545                  * this socket whilst writeable. This means that we
 546                  * must DELETE the socket whilst writeable too!
 547                  */
 548                 this->sock->state = I_ERROR;
 549
 550                 if (ServerInstance->SocketCull.find(this->sock) == ServerInstance->SocketCull.end())
 551                         ServerInstance->SocketCull[this->sock] = this->sock;
 552         }
 553
 554         this->sock->Timeout = NULL;
 555 }
 556
 557 bool InspSocket::Poll()
 558 {
 559 #ifdef WINDOWS
 560         if(Instance->SE->GetRef(this->fd) != this)
 561                 return false;
 562         int incoming = -1;
 563 #else
 564         if (this->Instance->SE->GetRef(this->fd) != this)
 565                 return false;
 566
 567         int incoming = -1;
 568
 569         if ((fd < 0) || (fd > MAX_DESCRIPTORS))
 570                 return false;
 571 #endif
 572         switch (this->state)
 573         {
 574                 case I_CONNECTING:
 575                         /* Our socket was in write-state, so delete it and re-add it
 576                          * in read-state.
 577                          */
 578 #ifndef WINDOWS
 579                         if (this->fd > -1)
 580                         {
 581                                 this->Instance->SE->DelFd(this);
 582                                 this->SetState(I_CONNECTED);
 583                                 if (!this->Instance->SE->AddFd(this))
 584                                         return false;
 585                         }
 586 #else
 587                         this->SetState(I_CONNECTED);
 588 #endif
 589                         Instance->Log(DEBUG,"Inspsocket I_CONNECTING state");
 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                         sockaddr* client = new sockaddr[2];
 607                         length = sizeof (sockaddr_in);
 608                         std::string recvip;
 609 #ifdef IPV6
 610                         if ((!*this->host) || strchr(this->host, ':'))
 611                                 length = sizeof(sockaddr_in6);
 612 #endif
 613                         incoming = _accept (this->fd, client, &length);
 614 #ifdef IPV6
 615                         if ((!*this->host) || strchr(this->host, ':'))
 616                         {
 617                                 char buf[1024];
 618                                 recvip = inet_ntop(AF_INET6, &((sockaddr_in6*)client)->sin6_addr, buf, sizeof(buf));
 619                         }
 620                         else
 621 #endif
 622                         recvip = inet_ntoa(((sockaddr_in*)client)->sin_addr);
 623                         this->OnIncomingConnection(incoming, (char*)recvip.c_str());
 624
 625                         if (this->IsIOHooked)
 626                         {
 627                                 try
 628                                 {
 629                                         Instance->Config->GetIOHook(this)->OnRawSocketAccept(incoming, recvip.c_str(), this->port);
 630                                 }
 631                                 catch (CoreException& modexcept)
 632                                 {
 633                                         Instance->Log(DEBUG,"%s threw an exception: %s", modexcept.GetSource(), modexcept.GetReason());
 634                                 }
 635                         }
 636
 637                         this->SetQueues(incoming);
 638
 639                         delete[] client;
 640                         return true;
 641                 }
 642                 break;
 643                 case I_CONNECTED:
 644                         /* Process the read event */
 645                         return this->OnDataReady();
 646                 break;
 647                 default:
 648                 break;
 649         }
 650         return true;
 651 }
 652
 653 void InspSocket::SetState(InspSocketState s)
 654 {
 655         this->state = s;
 656 }
 657
 658 InspSocketState InspSocket::GetState()
 659 {
 660         return this->state;
 661 }
 662
 663 int InspSocket::GetFd()
 664 {
 665         return this->fd;
 666 }
 667
 668 bool InspSocket::OnConnected() { return true; }
 669 void InspSocket::OnError(InspSocketError e) { return; }
 670 int InspSocket::OnDisconnect() { return 0; }
 671 int InspSocket::OnIncomingConnection(int newfd, char* ip) { return 0; }
 672 bool InspSocket::OnDataReady() { return true; }
 673 bool InspSocket::OnWriteReady() { return true; }
 674 void InspSocket::OnTimeout() { return; }
 675 void InspSocket::OnClose() { return; }
 676
 677 InspSocket::~InspSocket()
 678 {
 679         this->Close();
 680         if (Timeout)
 681         {
 682                 Instance->Timers->DelTimer(Timeout);
 683                 Timeout = NULL;
 684         }
 685 }
 686
 687 void InspSocket::HandleEvent(EventType et, int errornum)
 688 {
 689         switch (et)
 690         {
 691                 case EVENT_ERROR:
 692                         switch (errornum)
 693                         {
 694                                 case ETIMEDOUT:
 695                                         this->OnError(I_ERR_TIMEOUT);
 696                                 break;
 697                                 case ECONNREFUSED:
 698                                 case 0:
 699                                         this->OnError(this->state == I_CONNECTING ? I_ERR_CONNECT : I_ERR_WRITE);
 700                                 break;
 701                                 case EADDRINUSE:
 702                                         this->OnError(I_ERR_BIND);
 703                                 break;
 704                                 case EPIPE:
 705                                 case EIO:
 706                                         this->OnError(I_ERR_WRITE);
 707                                 break;
 708                         }
 709                         if (this->Instance->SocketCull.find(this) == this->Instance->SocketCull.end())
 710                                 this->Instance->SocketCull[this] = this;
 711                         return;
 712                 break;
 713                 case EVENT_READ:
 714                         if (!this->Poll())
 715                         {
 716                                 if (this->Instance->SocketCull.find(this) == this->Instance->SocketCull.end())
 717                                         this->Instance->SocketCull[this] = this;
 718                                 return;
 719                         }
 720                 break;
 721                 case EVENT_WRITE:
 722                         if (this->WaitingForWriteEvent)
 723                         {
 724                                 this->WaitingForWriteEvent = false;
 725                                 if (!this->OnWriteReady())
 726                                 {
 727                                         if (this->Instance->SocketCull.find(this) == this->Instance->SocketCull.end())
 728                                                 this->Instance->SocketCull[this] = this;
 729                                         return;
 730                                 }
 731                         }
 732                         if (this->state == I_CONNECTING)
 733                         {
 734                                 /* This might look wrong as if we should be actually calling
 735                                  * with EVENT_WRITE, but trust me it is correct. There are some
 736                                  * writeability-state things in the read code, because of how
 737                                  * InspSocket used to work regarding write buffering in previous
 738                                  * versions of InspIRCd. - Brain
 739                                  */
 740                                 this->HandleEvent(EVENT_READ);
 741                                 return;
 742                         }
 743                         else
 744                         {
 745                                 if (this->FlushWriteBuffer())
 746                                 {
 747                                         if (this->Instance->SocketCull.find(this) == this->Instance->SocketCull.end())
 748                                                 this->Instance->SocketCull[this] = this;
 749                                         return;
 750                                 }
 751                         }
 752                 break;
 753         }
 754 }
 755