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                 this->Instance->Log(DEFAULT, "Could not increase SO_SNDBUF/SO_RCVBUF for socket %u", GetFd());
 155 }
 156
 157 /* Most irc servers require you to specify the ip you want to bind to.
 158  * If you dont specify an IP, they rather dumbly bind to the first IP
 159  * of the box (e.g. INADDR_ANY). In InspIRCd, we scan thought the IP
 160  * addresses we've bound server ports to, and we try and bind our outbound
 161  * connections to the first usable non-loopback and non-any IP we find.
 162  * This is easier to configure when you have a lot of links and a lot
 163  * of servers to configure.
 164  */
 165 bool BufferedSocket::BindAddr(const std::string &ip)
 166 {
 167         ConfigReader Conf(this->Instance);
 168         socklen_t size = sizeof(sockaddr_in);
 169 #ifdef IPV6
 170         bool v6 = false;
 171         /* Are we looking for a binding to fit an ipv6 host? */
 172         if ((ip.empty()) || (ip.find(':') != std::string::npos))
 173                 v6 = true;
 174 #endif
 175         int j = 0;
 176         while (j < Conf.Enumerate("bind") || (!ip.empty()))
 177         {
 178                 std::string IP = ip.empty() ? Conf.ReadValue("bind","address",j) : ip;
 179                 if (!ip.empty() || Conf.ReadValue("bind","type",j) == "servers")
 180                 {
 181                         if (!ip.empty() || ((IP != "*") && (IP != "127.0.0.1") && (!IP.empty()) && (IP != "::1")))
 182                         {
 183                                 /* The [2] is required because we may write a sockaddr_in6 here, and sockaddr_in6 is larger than sockaddr, where sockaddr_in4 is not. */
 184                                 sockaddr* s = new sockaddr[2];
 185 #ifdef IPV6
 186                                 if (v6)
 187                                 {
 188                                         in6_addr n;
 189                                         if (inet_pton(AF_INET6, IP.c_str(), &n) > 0)
 190                                         {
 191                                                 memcpy(&((sockaddr_in6*)s)->sin6_addr, &n, sizeof(sockaddr_in6));
 192                                                 ((sockaddr_in6*)s)->sin6_port = 0;
 193                                                 ((sockaddr_in6*)s)->sin6_family = AF_INET6;
 194                                                 size = sizeof(sockaddr_in6);
 195                                         }
 196                                         else
 197                                         {
 198                                                 delete[] s;
 199                                                 j++;
 200                                                 continue;
 201                                         }
 202                                 }
 203                                 else
 204 #endif
 205                                 {
 206                                         in_addr n;
 207                                         if (inet_aton(IP.c_str(), &n) > 0)
 208                                         {
 209                                                 ((sockaddr_in*)s)->sin_addr = n;
 210                                                 ((sockaddr_in*)s)->sin_port = 0;
 211                                                 ((sockaddr_in*)s)->sin_family = AF_INET;
 212                                         }
 213                                         else
 214                                         {
 215                                                 delete[] s;
 216                                                 j++;
 217                                                 continue;
 218                                         }
 219                                 }
 220
 221                                 if (Instance->SE->Bind(this->fd, s, size) < 0)
 222                                 {
 223                                         this->state = I_ERROR;
 224                                         this->OnError(I_ERR_BIND);
 225                                         this->fd = -1;
 226                                         delete[] s;
 227                                         return false;
 228                                 }
 229
 230                                 delete[] s;
 231                                 return true;
 232                         }
 233                 }
 234                 j++;
 235         }
 236         return true;
 237 }
 238
 239 bool BufferedSocket::DoConnect()
 240 {
 241         /* The [2] is required because we may write a sockaddr_in6 here, and sockaddr_in6 is larger than sockaddr, where sockaddr_in4 is not. */
 242         sockaddr* addr = new sockaddr[2];
 243         socklen_t size = sizeof(sockaddr_in);
 244 #ifdef IPV6
 245         bool v6 = false;
 246         if ((!*this->host) || strchr(this->host, ':'))
 247                 v6 = true;
 248
 249         if (v6)
 250         {
 251                 this->fd = socket(AF_INET6, SOCK_STREAM, 0);
 252                 if ((this->fd > -1) && ((strstr(this->IP,"::ffff:") != (char*)&this->IP) && (strstr(this->IP,"::FFFF:") != (char*)&this->IP)))
 253                 {
 254                         if (!this->BindAddr(this->cbindip))
 255                         {
 256                                 delete[] addr;
 257                                 return false;
 258                         }
 259                 }
 260         }
 261         else
 262 #endif
 263         {
 264                 this->fd = socket(AF_INET, SOCK_STREAM, 0);
 265                 if (this->fd > -1)
 266                 {
 267                         if (!this->BindAddr(this->cbindip))
 268                         {
 269                                 delete[] addr;
 270                                 return false;
 271                         }
 272                 }
 273         }
 274
 275         if (this->fd == -1)
 276         {
 277                 this->state = I_ERROR;
 278                 this->OnError(I_ERR_SOCKET);
 279                 delete[] addr;
 280                 return false;
 281         }
 282
 283 #ifdef IPV6
 284         if (v6)
 285         {
 286                 in6_addr addy;
 287                 if (inet_pton(AF_INET6, this->host, &addy) > 0)
 288                 {
 289                         ((sockaddr_in6*)addr)->sin6_family = AF_INET6;
 290                         memcpy(&((sockaddr_in6*)addr)->sin6_addr, &addy, sizeof(addy));
 291                         ((sockaddr_in6*)addr)->sin6_port = htons(this->port);
 292                         size = sizeof(sockaddr_in6);
 293                 }
 294         }
 295         else
 296 #endif
 297         {
 298                 in_addr addy;
 299                 if (inet_aton(this->host, &addy) > 0)
 300                 {
 301                         ((sockaddr_in*)addr)->sin_family = AF_INET;
 302                         ((sockaddr_in*)addr)->sin_addr = addy;
 303                         ((sockaddr_in*)addr)->sin_port = htons(this->port);
 304                 }
 305         }
 306
 307         Instance->SE->NonBlocking(this->fd);
 308
 309 #ifdef WIN32
 310         /* UGH for the LOVE OF ZOMBIE JESUS SOMEONE FIX THIS!!!!!!!!!!! */
 311         Instance->SE->Blocking(this->fd);
 312 #endif
 313
 314         if (Instance->SE->Connect(this, (sockaddr*)addr, size) == -1)
 315         {
 316                 if (errno != EINPROGRESS)
 317                 {
 318                         this->OnError(I_ERR_CONNECT);
 319                         this->Close();
 320                         this->state = I_ERROR;
 321                         return false;
 322                 }
 323
 324                 this->Timeout = new SocketTimeout(this->GetFd(), this->Instance, this, timeout_val, this->Instance->Time());
 325                 this->Instance->Timers->AddTimer(this->Timeout);
 326         }
 327 #ifdef WIN32
 328         /* CRAQ SMOKING STUFF TO BE FIXED */
 329         Instance->SE->NonBlocking(this->fd);
 330 #endif
 331         this->state = I_CONNECTING;
 332         if (this->fd > -1)
 333         {
 334                 if (!this->Instance->SE->AddFd(this))
 335                 {
 336                         this->OnError(I_ERR_NOMOREFDS);
 337                         this->Close();
 338                         this->state = I_ERROR;
 339                         return false;
 340                 }
 341                 this->SetQueues(this->fd);
 342         }
 343         return true;
 344 }
 345
 346
 347 void BufferedSocket::Close()
 348 {
 349         /* Save this, so we dont lose it,
 350          * otherise on failure, error messages
 351          * might be inaccurate.
 352          */
 353         int save = errno;
 354         if (this->fd > -1)
 355         {
 356                 if (this->IsIOHooked && Instance->Config->GetIOHook(this))
 357                 {
 358                         try
 359                         {
 360                                 Instance->Config->GetIOHook(this)->OnRawSocketClose(this->fd);
 361                         }
 362                         catch (CoreException& modexcept)
 363                         {
 364                                 Instance->Log(DEFAULT,"%s threw an exception: %s", modexcept.GetSource(), modexcept.GetReason());
 365                         }
 366                 }
 367                 Instance->SE->Shutdown(this, 2);
 368                 if (Instance->SE->Close(this) != -1)
 369                         this->OnClose();
 370
 371                 if (Instance->SocketCull.find(this) == Instance->SocketCull.end())
 372                         Instance->SocketCull[this] = this;
 373         }
 374         errno = save;
 375 }
 376
 377 std::string BufferedSocket::GetIP()
 378 {
 379         return this->IP;
 380 }
 381
 382 char* BufferedSocket::Read()
 383 {
 384         if (!Instance->SE->BoundsCheckFd(this))
 385                 return NULL;
 386
 387         int n = 0;
 388
 389         if (this->IsIOHooked)
 390         {
 391                 int result2 = 0;
 392                 int MOD_RESULT = 0;
 393                 try
 394                 {
 395                         MOD_RESULT = Instance->Config->GetIOHook(this)->OnRawSocketRead(this->fd,this->ibuf,sizeof(this->ibuf),result2);
 396                 }
 397                 catch (CoreException& modexcept)
 398                 {
 399                         Instance->Log(DEFAULT,"%s threw an exception: %s", modexcept.GetSource(), modexcept.GetReason());
 400                 }
 401                 if (MOD_RESULT < 0)
 402                 {
 403                         n = -1;
 404                         errno = EAGAIN;
 405                 }
 406                 else
 407                 {
 408                         n = result2;
 409                 }
 410         }
 411         else
 412         {
 413                 n = recv(this->fd,this->ibuf,sizeof(this->ibuf),0);
 414         }
 415
 416         if ((n > 0) && (n <= (int)sizeof(this->ibuf)))
 417         {
 418                 ibuf[n] = 0;
 419                 return ibuf;
 420         }
 421         else
 422         {
 423                 int err = errno;
 424                 if (err == EAGAIN)
 425                         return "";
 426                 else
 427                         return NULL;
 428         }
 429 }
 430
 431 void BufferedSocket::MarkAsClosed()
 432 {
 433 }
 434
 435 // There are two possible outcomes to this function.
 436 // It will either write all of the data, or an undefined amount.
 437 // If an undefined amount is written the connection has failed
 438 // and should be aborted.
 439 int BufferedSocket::Write(const std::string &data)
 440 {
 441         /* Try and append the data to the back of the queue, and send it on its way
 442          */
 443         outbuffer.push_back(data);
 444         this->Instance->SE->WantWrite(this);
 445         return (!this->FlushWriteBuffer());
 446 }
 447
 448 bool BufferedSocket::FlushWriteBuffer()
 449 {
 450         errno = 0;
 451         if ((this->fd > -1) && (this->state == I_CONNECTED))
 452         {
 453                 if (this->IsIOHooked)
 454                 {
 455                         while (outbuffer.size() && (errno != EAGAIN))
 456                         {
 457                                 try
 458                                 {
 459                                         /* XXX: The lack of buffering here is NOT a bug, modules implementing this interface have to
 460                                          * implement their own buffering mechanisms
 461                                          */
 462                                         Instance->Config->GetIOHook(this)->OnRawSocketWrite(this->fd, outbuffer[0].c_str(), outbuffer[0].length());
 463                                         outbuffer.pop_front();
 464                                 }
 465                                 catch (CoreException& modexcept)
 466                                 {
 467                                         Instance->Log(DEBUG,"%s threw an exception: %s", modexcept.GetSource(), modexcept.GetReason());
 468                                         return true;
 469                                 }
 470                         }
 471                 }
 472                 else
 473                 {
 474                         /* If we have multiple lines, try to send them all,
 475                          * not just the first one -- Brain
 476                          */
 477                         while (outbuffer.size() && (errno != EAGAIN))
 478                         {
 479                                 /* Send a line */
 480                                 int result = Instance->SE->Send(this, outbuffer[0].c_str(), outbuffer[0].length(), 0);
 481
 482                                 if (result > 0)
 483                                 {
 484                                         if ((unsigned int)result >= outbuffer[0].length())
 485                                         {
 486                                                 /* The whole block was written (usually a line)
 487                                                  * Pop the block off the front of the queue,
 488                                                  * dont set errno, because we are clear of errors
 489                                                  * and want to try and write the next block too.
 490                                                  */
 491                                                 outbuffer.pop_front();
 492                                         }
 493                                         else
 494                                         {
 495                                                 std::string temp = outbuffer[0].substr(result);
 496                                                 outbuffer[0] = temp;
 497                                                 /* We didnt get the whole line out. arses.
 498                                                  * Try again next time, i guess. Set errno,
 499                                                  * because we shouldnt be writing any more now,
 500                                                  * until the socketengine says its safe to do so.
 501                                                  */
 502                                                 errno = EAGAIN;
 503                                         }
 504                                 }
 505                                 else if (result == 0)
 506                                 {
 507                                         this->Instance->SE->DelFd(this);
 508                                         this->Close();
 509                                         return true;
 510                                 }
 511                                 else if ((result == -1) && (errno != EAGAIN))
 512                                 {
 513                                         this->OnError(I_ERR_WRITE);
 514                                         this->state = I_ERROR;
 515                                         this->Instance->SE->DelFd(this);
 516                                         this->Close();
 517                                         return true;
 518                                 }
 519                         }
 520                 }
 521         }
 522
 523         if ((errno == EAGAIN) && (fd > -1))
 524         {
 525                 this->Instance->SE->WantWrite(this);
 526         }
 527
 528         return (fd < 0);
 529 }
 530
 531 void SocketTimeout::Tick(time_t now)
 532 {
 533         if (ServerInstance->SE->GetRef(this->sfd) != this->sock)
 534                 return;
 535
 536         if (this->sock->state == I_CONNECTING)
 537         {
 538                 // for non-listening sockets, the timeout can occur
 539                 // which causes termination of the connection after
 540                 // the given number of seconds without a successful
 541                 // connection.
 542                 this->sock->OnTimeout();
 543                 this->sock->OnError(I_ERR_TIMEOUT);
 544                 this->sock->timeout = true;
 545
 546                 /* NOTE: We must set this AFTER DelFd, as we added
 547                  * this socket whilst writeable. This means that we
 548                  * must DELETE the socket whilst writeable too!
 549                  */
 550                 this->sock->state = I_ERROR;
 551
 552                 if (ServerInstance->SocketCull.find(this->sock) == ServerInstance->SocketCull.end())
 553                         ServerInstance->SocketCull[this->sock] = this->sock;
 554         }
 555
 556         this->sock->Timeout = NULL;
 557 }
 558
 559 bool BufferedSocket::Poll()
 560 {
 561         int incoming = -1;
 562
 563 #ifndef WINDOWS
 564         if (!Instance->SE->BoundsCheckFd(this))
 565                 return false;
 566 #endif
 567
 568         if (Instance->SE->GetRef(this->fd) != this)
 569                 return false;
 570
 571         switch (this->state)
 572         {
 573                 case I_CONNECTING:
 574                         /* Our socket was in write-state, so delete it and re-add it
 575                          * in read-state.
 576                          */
 577 #ifndef WINDOWS
 578                         if (this->fd > -1)
 579                         {
 580                                 this->Instance->SE->DelFd(this);
 581                                 if (!this->Instance->SE->AddFd(this))
 582                                         return false;
 583                         }
 584 #endif
 585                         this->SetState(I_CONNECTED);
 586
 587                         if (Instance->Config->GetIOHook(this))
 588                         {
 589                                 Instance->Log(DEBUG,"Hook for raw connect");
 590                                 try
 591                                 {
 592                                         Instance->Config->GetIOHook(this)->OnRawSocketConnect(this->fd);
 593                                 }
 594                                 catch (CoreException& modexcept)
 595                                 {
 596                                         Instance->Log(DEBUG,"%s threw an exception: %s", modexcept.GetSource(), modexcept.GetReason());
 597                                 }
 598                         }
 599                         return this->OnConnected();
 600                 break;
 601                 case I_LISTENING:
 602                 {
 603                         /* The [2] is required because we may write a sockaddr_in6 here, and sockaddr_in6 is larger than sockaddr, where sockaddr_in4 is not. */
 604                         sockaddr* client = new sockaddr[2];
 605                         length = sizeof (sockaddr_in);
 606                         std::string recvip;
 607 #ifdef IPV6
 608                         if ((!*this->host) || strchr(this->host, ':'))
 609                                 length = sizeof(sockaddr_in6);
 610 #endif
 611                         incoming = Instance->SE->Accept(this, client, &length);
 612 #ifdef IPV6
 613                         if ((!*this->host) || strchr(this->host, ':'))
 614                         {
 615                                 char buf[1024];
 616                                 recvip = inet_ntop(AF_INET6, &((sockaddr_in6*)client)->sin6_addr, buf, sizeof(buf));
 617                         }
 618                         else
 619 #endif
 620                         Instance->SE->NonBlocking(incoming);
 621
 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 BufferedSocket::SetState(BufferedSocketState s)
 654 {
 655         this->state = s;
 656 }
 657
 658 BufferedSocketState BufferedSocket::GetState()
 659 {
 660         return this->state;
 661 }
 662
 663 int BufferedSocket::GetFd()
 664 {
 665         return this->fd;
 666 }
 667
 668 bool BufferedSocket::OnConnected() { return true; }
 669 void BufferedSocket::OnError(BufferedSocketError e) { return; }
 670 int BufferedSocket::OnDisconnect() { return 0; }
 671 int BufferedSocket::OnIncomingConnection(int newfd, char* ip) { return 0; }
 672 bool BufferedSocket::OnDataReady() { return true; }
 673 bool BufferedSocket::OnWriteReady() { return true; }
 674 void BufferedSocket::OnTimeout() { return; }
 675 void BufferedSocket::OnClose() { return; }
 676
 677 BufferedSocket::~BufferedSocket()
 678 {
 679         this->Close();
 680         if (Timeout)
 681         {
 682                 Instance->Timers->DelTimer(Timeout);
 683                 Timeout = NULL;
 684         }
 685 }
 686
 687 void BufferedSocket::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                                  * BufferedSocket 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