src/inspsocket.cpp

   1 /*       +------------------------------------+
   2  *       | Inspire Internet Relay Chat Daemon |
   3  *       +------------------------------------+
   4  *
   5  *  InspIRCd: (C) 2002-2008 InspIRCd Development Team
   6  * See: http://www.inspircd.org/wiki/index.php/Credits
   7  *
   8  * This program is free but copyrighted software; see
   9  *            the file COPYING for details.
  10  *
  11  * ---------------------------------------------------
  12  */
  13
  14 /* $Core: libIRCDinspsocket */
  15
  16 #include "socket.h"
  17 #include "inspstring.h"
  18 #include "socketengine.h"
  19 #include "inspircd.h"
  20
  21 using irc::sockets::OpenTCPSocket;
  22
  23 bool BufferedSocket::Readable()
  24 {
  25         return ((this->state != I_CONNECTING) && (this->WaitingForWriteEvent == false));
  26 }
  27
  28 BufferedSocket::BufferedSocket(InspIRCd* SI)
  29 {
  30         this->Timeout = NULL;
  31         this->state = I_DISCONNECTED;
  32         this->fd = -1;
  33         this->WaitingForWriteEvent = false;
  34         this->Instance = SI;
  35         this->IsIOHooked = false;
  36 }
  37
  38 BufferedSocket::BufferedSocket(InspIRCd* SI, int newfd, const char* ip)
  39 {
  40         this->Timeout = NULL;
  41         this->fd = newfd;
  42         this->state = I_CONNECTED;
  43         strlcpy(this->IP,ip,MAXBUF);
  44         this->WaitingForWriteEvent = false;
  45         this->Instance = SI;
  46         this->IsIOHooked = false;
  47         if (this->fd > -1)
  48                 this->Instance->SE->AddFd(this);
  49 }
  50
  51 BufferedSocket::BufferedSocket(InspIRCd* SI, const std::string &ipaddr, int aport, bool listening, unsigned long maxtime, const std::string &connectbindip)
  52 {
  53         this->cbindip = connectbindip;
  54         this->fd = -1;
  55         this->Instance = SI;
  56         strlcpy(host,ipaddr.c_str(),MAXBUF);
  57         this->WaitingForWriteEvent = false;
  58         this->IsIOHooked = false;
  59         this->Timeout = NULL;
  60         if (listening)
  61         {
  62                 if ((this->fd = OpenTCPSocket(host)) == ERROR)
  63                 {
  64                         this->fd = -1;
  65                         this->state = I_ERROR;
  66                         this->OnError(I_ERR_SOCKET);
  67                         return;
  68                 }
  69                 else
  70                 {
  71                         if (!SI->BindSocket(this->fd,aport,(char*)ipaddr.c_str()))
  72                         {
  73                                 this->Close();
  74                                 this->fd = -1;
  75                                 this->state = I_ERROR;
  76                                 this->OnError(I_ERR_BIND);
  77                                 this->ClosePending = true;
  78                                 return;
  79                         }
  80                         else
  81                         {
  82                                 this->state = I_LISTENING;
  83                                 this->port = aport;
  84                                 if (this->fd > -1)
  85                                 {
  86                                         if (!this->Instance->SE->AddFd(this))
  87                                         {
  88                                                 this->Close();
  89                                                 this->state = I_ERROR;
  90                                                 this->OnError(I_ERR_NOMOREFDS);
  91                                         }
  92                                 }
  93                                 return;
  94                         }
  95                 }
  96         }
  97         else
  98         {
  99                 strlcpy(this->host,ipaddr.c_str(),MAXBUF);
 100                 this->port = aport;
 101
 102                 bool ipvalid = true;
 103 #ifdef IPV6
 104                 if (strchr(host,':'))
 105                 {
 106                         in6_addr n;
 107                         if (inet_pton(AF_INET6, host, &n) < 1)
 108                                 ipvalid = false;
 109                 }
 110                 else
 111 #endif
 112                 {
 113                         in_addr n;
 114                         if (inet_aton(host,&n) < 1)
 115                                 ipvalid = false;
 116                 }
 117                 if (!ipvalid)
 118                 {
 119                         this->Instance->Log(DEBUG,"BUG: Hostname passed to BufferedSocket, rather than an IP address!");
 120                         this->OnError(I_ERR_CONNECT);
 121                         this->Close();
 122                         this->fd = -1;
 123                         this->state = I_ERROR;
 124                         return;
 125                 }
 126                 else
 127                 {
 128                         strlcpy(this->IP,host,MAXBUF);
 129                         timeout_val = maxtime;
 130                         if (!this->DoConnect())
 131                         {
 132                                 this->OnError(I_ERR_CONNECT);
 133                                 this->Close();
 134                                 this->fd = -1;
 135                                 this->state = I_ERROR;
 136                                 return;
 137                         }
 138                 }
 139         }
 140 }
 141
 142 void BufferedSocket::WantWrite()
 143 {
 144         this->Instance->SE->WantWrite(this);
 145         this->WaitingForWriteEvent = true;
 146 }
 147
 148 void BufferedSocket::SetQueues(int nfd)
 149 {
 150         // attempt to increase socket sendq and recvq as high as its possible
 151         int sendbuf = 32768;
 152         int recvbuf = 32768;
 153         if(setsockopt(nfd,SOL_SOCKET,SO_SNDBUF,(const char *)&sendbuf,sizeof(sendbuf)) || setsockopt(nfd,SOL_SOCKET,SO_RCVBUF,(const char *)&recvbuf,sizeof(sendbuf)))
 154         {
 155                 //this->Instance->Log(DEFAULT, "Could not increase SO_SNDBUF/SO_RCVBUF for socket %u", GetFd());
 156                 ; // do nothing. I'm a little sick of people trying to interpret this message as a result of why their incorrect setups don't work.
 157         }
 158 }
 159
 160 /* Most irc servers require you to specify the ip you want to bind to.
 161  * If you dont specify an IP, they rather dumbly bind to the first IP
 162  * of the box (e.g. INADDR_ANY). In InspIRCd, we scan thought the IP
 163  * addresses we've bound server ports to, and we try and bind our outbound
 164  * connections to the first usable non-loopback and non-any IP we find.
 165  * This is easier to configure when you have a lot of links and a lot
 166  * of servers to configure.
 167  */
 168 bool BufferedSocket::BindAddr(const std::string &ip)
 169 {
 170         ConfigReader Conf(this->Instance);
 171         socklen_t size = sizeof(sockaddr_in);
 172 #ifdef IPV6
 173         bool v6 = false;
 174         /* Are we looking for a binding to fit an ipv6 host? */
 175         if ((ip.empty()) || (ip.find(':') != std::string::npos))
 176                 v6 = true;
 177 #endif
 178         int j = 0;
 179         while (j < Conf.Enumerate("bind") || (!ip.empty()))
 180         {
 181                 std::string IP = ip.empty() ? Conf.ReadValue("bind","address",j) : ip;
 182                 if (!ip.empty() || Conf.ReadValue("bind","type",j) == "servers")
 183                 {
 184                         if (!ip.empty() || ((IP != "*") && (IP != "127.0.0.1") && (!IP.empty()) && (IP != "::1")))
 185                         {
 186                                 /* The [2] is required because we may write a sockaddr_in6 here, and sockaddr_in6 is larger than sockaddr, where sockaddr_in4 is not. */
 187                                 sockaddr* s = new sockaddr[2];
 188 #ifdef IPV6
 189                                 if (v6)
 190                                 {
 191                                         in6_addr n;
 192                                         if (inet_pton(AF_INET6, IP.c_str(), &n) > 0)
 193                                         {
 194                                                 memcpy(&((sockaddr_in6*)s)->sin6_addr, &n, sizeof(sockaddr_in6));
 195                                                 ((sockaddr_in6*)s)->sin6_port = 0;
 196                                                 ((sockaddr_in6*)s)->sin6_family = AF_INET6;
 197                                                 size = sizeof(sockaddr_in6);
 198                                         }
 199                                         else
 200                                         {
 201                                                 delete[] s;
 202                                                 j++;
 203                                                 continue;
 204                                         }
 205                                 }
 206                                 else
 207 #endif
 208                                 {
 209                                         in_addr n;
 210                                         if (inet_aton(IP.c_str(), &n) > 0)
 211                                         {
 212                                                 ((sockaddr_in*)s)->sin_addr = n;
 213                                                 ((sockaddr_in*)s)->sin_port = 0;
 214                                                 ((sockaddr_in*)s)->sin_family = AF_INET;
 215                                         }
 216                                         else
 217                                         {
 218                                                 delete[] s;
 219                                                 j++;
 220                                                 continue;
 221                                         }
 222                                 }
 223
 224                                 if (Instance->SE->Bind(this->fd, s, size) < 0)
 225                                 {
 226                                         this->state = I_ERROR;
 227                                         this->OnError(I_ERR_BIND);
 228                                         this->fd = -1;
 229                                         delete[] s;
 230                                         return false;
 231                                 }
 232
 233                                 delete[] s;
 234                                 return true;
 235                         }
 236                 }
 237                 j++;
 238         }
 239         Instance->Log(DEBUG,"nothing in the config to bind()!");
 240         return true;
 241 }
 242
 243 bool BufferedSocket::DoConnect()
 244 {
 245         /* The [2] is required because we may write a sockaddr_in6 here, and sockaddr_in6 is larger than sockaddr, where sockaddr_in4 is not. */
 246         sockaddr* addr = new sockaddr[2];
 247         socklen_t size = sizeof(sockaddr_in);
 248 #ifdef IPV6
 249         bool v6 = false;
 250         if ((!*this->host) || strchr(this->host, ':'))
 251                 v6 = true;
 252
 253         if (v6)
 254         {
 255                 this->fd = socket(AF_INET6, SOCK_STREAM, 0);
 256                 if ((this->fd > -1) && ((strstr(this->IP,"::ffff:") != (char*)&this->IP) && (strstr(this->IP,"::FFFF:") != (char*)&this->IP)))
 257                 {
 258                         if (!this->BindAddr(this->cbindip))
 259                         {
 260                                 delete[] addr;
 261                                 return false;
 262                         }
 263                 }
 264         }
 265         else
 266 #endif
 267         {
 268                 this->fd = socket(AF_INET, SOCK_STREAM, 0);
 269                 if (this->fd > -1)
 270                 {
 271                         if (!this->BindAddr(this->cbindip))
 272                         {
 273                                 delete[] addr;
 274                                 return false;
 275                         }
 276                 }
 277         }
 278
 279         if (this->fd == -1)
 280         {
 281                 this->state = I_ERROR;
 282                 this->OnError(I_ERR_SOCKET);
 283                 delete[] addr;
 284                 return false;
 285         }
 286
 287 #ifdef IPV6
 288         if (v6)
 289         {
 290                 in6_addr addy;
 291                 if (inet_pton(AF_INET6, this->host, &addy) > 0)
 292                 {
 293                         ((sockaddr_in6*)addr)->sin6_family = AF_INET6;
 294                         memcpy(&((sockaddr_in6*)addr)->sin6_addr, &addy, sizeof(addy));
 295                         ((sockaddr_in6*)addr)->sin6_port = htons(this->port);
 296                         size = sizeof(sockaddr_in6);
 297                 }
 298         }
 299         else
 300 #endif
 301         {
 302                 in_addr addy;
 303                 if (inet_aton(this->host, &addy) > 0)
 304                 {
 305                         ((sockaddr_in*)addr)->sin_family = AF_INET;
 306                         ((sockaddr_in*)addr)->sin_addr = addy;
 307                         ((sockaddr_in*)addr)->sin_port = htons(this->port);
 308                 }
 309         }
 310
 311         Instance->SE->NonBlocking(this->fd);
 312
 313 #ifdef WIN32
 314         /* UGH for the LOVE OF ZOMBIE JESUS SOMEONE FIX THIS!!!!!!!!!!! */
 315         Instance->SE->Blocking(this->fd);
 316 #endif
 317
 318         if (Instance->SE->Connect(this, (sockaddr*)addr, size) == -1)
 319         {
 320                 if (errno != EINPROGRESS)
 321                 {
 322                         this->OnError(I_ERR_CONNECT);
 323                         this->Close();
 324                         this->state = I_ERROR;
 325                         return false;
 326                 }
 327
 328                 this->Timeout = new SocketTimeout(this->GetFd(), this->Instance, this, timeout_val, this->Instance->Time());
 329                 this->Instance->Timers->AddTimer(this->Timeout);
 330         }
 331 #ifdef WIN32
 332         /* CRAQ SMOKING STUFF TO BE FIXED */
 333         Instance->SE->NonBlocking(this->fd);
 334 #endif
 335         this->state = I_CONNECTING;
 336         if (this->fd > -1)
 337         {
 338                 if (!this->Instance->SE->AddFd(this))
 339                 {
 340                         this->OnError(I_ERR_NOMOREFDS);
 341                         this->Close();
 342                         this->state = I_ERROR;
 343                         return false;
 344                 }
 345                 this->SetQueues(this->fd);
 346         }
 347
 348         Instance->Log(DEBUG,"BufferedSocket::DoConnect success");
 349         return true;
 350 }
 351
 352
 353 void BufferedSocket::Close()
 354 {
 355         /* Save this, so we dont lose it,
 356          * otherise on failure, error messages
 357          * might be inaccurate.
 358          */
 359         int save = errno;
 360         if (this->fd > -1)
 361         {
 362                 if (this->IsIOHooked && Instance->Config->GetIOHook(this))
 363                 {
 364                         try
 365                         {
 366                                 Instance->Config->GetIOHook(this)->OnRawSocketClose(this->fd);
 367                         }
 368                         catch (CoreException& modexcept)
 369                         {
 370                                 Instance->Log(DEFAULT,"%s threw an exception: %s", modexcept.GetSource(), modexcept.GetReason());
 371                         }
 372                 }
 373                 Instance->SE->Shutdown(this, 2);
 374                 if (Instance->SE->Close(this) != -1)
 375                         this->OnClose();
 376
 377                 if (Instance->SocketCull.find(this) == Instance->SocketCull.end())
 378                         Instance->SocketCull[this] = this;
 379         }
 380         errno = save;
 381 }
 382
 383 std::string BufferedSocket::GetIP()
 384 {
 385         return this->IP;
 386 }
 387
 388 char* BufferedSocket::Read()
 389 {
 390         if (!Instance->SE->BoundsCheckFd(this))
 391                 return NULL;
 392
 393         int n = 0;
 394
 395         if (this->IsIOHooked)
 396         {
 397                 int result2 = 0;
 398                 int MOD_RESULT = 0;
 399                 try
 400                 {
 401                         MOD_RESULT = Instance->Config->GetIOHook(this)->OnRawSocketRead(this->fd,this->ibuf,sizeof(this->ibuf),result2);
 402                 }
 403                 catch (CoreException& modexcept)
 404                 {
 405                         Instance->Log(DEFAULT,"%s threw an exception: %s", modexcept.GetSource(), modexcept.GetReason());
 406                 }
 407                 if (MOD_RESULT < 0)
 408                 {
 409                         n = -1;
 410                         errno = EAGAIN;
 411                 }
 412                 else
 413                 {
 414                         n = result2;
 415                 }
 416         }
 417         else
 418         {
 419                 n = recv(this->fd,this->ibuf,sizeof(this->ibuf),0);
 420         }
 421
 422         if ((n > 0) && (n <= (int)sizeof(this->ibuf)))
 423         {
 424                 ibuf[n] = 0;
 425                 return ibuf;
 426         }
 427         else
 428         {
 429                 int err = errno;
 430                 if (err == EAGAIN)
 431                         return "";
 432                 else
 433                         return NULL;
 434         }
 435 }
 436
 437 void BufferedSocket::MarkAsClosed()
 438 {
 439 }
 440
 441 // There are two possible outcomes to this function.
 442 // It will either write all of the data, or an undefined amount.
 443 // If an undefined amount is written the connection has failed
 444 // and should be aborted.
 445 int BufferedSocket::Write(const std::string &data)
 446 {
 447         /* Try and append the data to the back of the queue, and send it on its way
 448          */
 449         outbuffer.push_back(data);
 450         this->Instance->SE->WantWrite(this);
 451         return (!this->FlushWriteBuffer());
 452 }
 453
 454 bool BufferedSocket::FlushWriteBuffer()
 455 {
 456         errno = 0;
 457         if ((this->fd > -1) && (this->state == I_CONNECTED))
 458         {
 459                 if (this->IsIOHooked)
 460                 {
 461                         while (outbuffer.size() && (errno != EAGAIN))
 462                         {
 463                                 try
 464                                 {
 465                                         /* XXX: The lack of buffering here is NOT a bug, modules implementing this interface have to
 466                                          * implement their own buffering mechanisms
 467                                          */
 468                                         Instance->Config->GetIOHook(this)->OnRawSocketWrite(this->fd, outbuffer[0].c_str(), outbuffer[0].length());
 469                                         outbuffer.pop_front();
 470                                 }
 471                                 catch (CoreException& modexcept)
 472                                 {
 473                                         Instance->Log(DEBUG,"%s threw an exception: %s", modexcept.GetSource(), modexcept.GetReason());
 474                                         return true;
 475                                 }
 476                         }
 477                 }
 478                 else
 479                 {
 480                         /* If we have multiple lines, try to send them all,
 481                          * not just the first one -- Brain
 482                          */
 483                         while (outbuffer.size() && (errno != EAGAIN))
 484                         {
 485                                 /* Send a line */
 486                                 int result = Instance->SE->Send(this, outbuffer[0].c_str(), outbuffer[0].length(), 0);
 487
 488                                 if (result > 0)
 489                                 {
 490                                         if ((unsigned int)result >= outbuffer[0].length())
 491                                         {
 492                                                 /* The whole block was written (usually a line)
 493                                                  * Pop the block off the front of the queue,
 494                                                  * dont set errno, because we are clear of errors
 495                                                  * and want to try and write the next block too.
 496                                                  */
 497                                                 outbuffer.pop_front();
 498                                         }
 499                                         else
 500                                         {
 501                                                 std::string temp = outbuffer[0].substr(result);
 502                                                 outbuffer[0] = temp;
 503                                                 /* We didnt get the whole line out. arses.
 504                                                  * Try again next time, i guess. Set errno,
 505                                                  * because we shouldnt be writing any more now,
 506                                                  * until the socketengine says its safe to do so.
 507                                                  */
 508                                                 errno = EAGAIN;
 509                                         }
 510                                 }
 511                                 else if (result == 0)
 512                                 {
 513                                         this->Instance->SE->DelFd(this);
 514                                         this->Close();
 515                                         return true;
 516                                 }
 517                                 else if ((result == -1) && (errno != EAGAIN))
 518                                 {
 519                                         this->OnError(I_ERR_WRITE);
 520                                         this->state = I_ERROR;
 521                                         this->Instance->SE->DelFd(this);
 522                                         this->Close();
 523                                         return true;
 524                                 }
 525                         }
 526                 }
 527         }
 528
 529         if ((errno == EAGAIN) && (fd > -1))
 530         {
 531                 this->Instance->SE->WantWrite(this);
 532         }
 533
 534         return (fd < 0);
 535 }
 536
 537 void SocketTimeout::Tick(time_t)
 538 {
 539         ServerInstance->Log(DEBUG,"SocketTimeout::Tick");
 540
 541         if (ServerInstance->SE->GetRef(this->sfd) != this->sock)
 542                 return;
 543
 544         if (this->sock->state == I_CONNECTING)
 545         {
 546                 // for non-listening sockets, the timeout can occur
 547                 // which causes termination of the connection after
 548                 // the given number of seconds without a successful
 549                 // connection.
 550                 this->sock->OnTimeout();
 551                 this->sock->OnError(I_ERR_TIMEOUT);
 552                 this->sock->timeout = true;
 553
 554                 /* NOTE: We must set this AFTER DelFd, as we added
 555                  * this socket whilst writeable. This means that we
 556                  * must DELETE the socket whilst writeable too!
 557                  */
 558                 this->sock->state = I_ERROR;
 559
 560                 if (ServerInstance->SocketCull.find(this->sock) == ServerInstance->SocketCull.end())
 561                         ServerInstance->SocketCull[this->sock] = this->sock;
 562         }
 563
 564         this->sock->Timeout = NULL;
 565 }
 566
 567 bool BufferedSocket::Poll()
 568 {
 569         int incoming = -1;
 570
 571 #ifndef WINDOWS
 572         if (!Instance->SE->BoundsCheckFd(this))
 573                 return false;
 574 #endif
 575
 576         if (Instance->SE->GetRef(this->fd) != this)
 577                 return false;
 578
 579         switch (this->state)
 580         {
 581                 case I_CONNECTING:
 582                         /* Our socket was in write-state, so delete it and re-add it
 583                          * in read-state.
 584                          */
 585 #ifndef WINDOWS
 586                         if (this->fd > -1)
 587                         {
 588                                 this->Instance->SE->DelFd(this);
 589                                 if (!this->Instance->SE->AddFd(this))
 590                                         return false;
 591                         }
 592 #endif
 593                         this->SetState(I_CONNECTED);
 594
 595                         if (Instance->Config->GetIOHook(this))
 596                         {
 597                                 Instance->Log(DEBUG,"Hook for raw connect");
 598                                 try
 599                                 {
 600                                         Instance->Config->GetIOHook(this)->OnRawSocketConnect(this->fd);
 601                                 }
 602                                 catch (CoreException& modexcept)
 603                                 {
 604                                         Instance->Log(DEBUG,"%s threw an exception: %s", modexcept.GetSource(), modexcept.GetReason());
 605                                 }
 606                         }
 607                         return this->OnConnected();
 608                 break;
 609                 case I_LISTENING:
 610                 {
 611                         /* The [2] is required because we may write a sockaddr_in6 here, and sockaddr_in6 is larger than sockaddr, where sockaddr_in4 is not. */
 612                         sockaddr* client = new sockaddr[2];
 613                         length = sizeof (sockaddr_in);
 614                         std::string recvip;
 615 #ifdef IPV6
 616                         if ((!*this->host) || strchr(this->host, ':'))
 617                                 length = sizeof(sockaddr_in6);
 618 #endif
 619                         incoming = Instance->SE->Accept(this, client, &length);
 620 #ifdef IPV6
 621                         if ((!*this->host) || strchr(this->host, ':'))
 622                         {
 623                                 char buf[1024];
 624                                 recvip = inet_ntop(AF_INET6, &((sockaddr_in6*)client)->sin6_addr, buf, sizeof(buf));
 625                         }
 626                         else
 627 #endif
 628                         Instance->SE->NonBlocking(incoming);
 629
 630                         recvip = inet_ntoa(((sockaddr_in*)client)->sin_addr);
 631                         this->OnIncomingConnection(incoming, (char*)recvip.c_str());
 632
 633                         if (this->IsIOHooked)
 634                         {
 635                                 try
 636                                 {
 637                                         Instance->Config->GetIOHook(this)->OnRawSocketAccept(incoming, recvip.c_str(), this->port);
 638                                 }
 639                                 catch (CoreException& modexcept)
 640                                 {
 641                                         Instance->Log(DEBUG,"%s threw an exception: %s", modexcept.GetSource(), modexcept.GetReason());
 642                                 }
 643                         }
 644
 645                         this->SetQueues(incoming);
 646
 647                         delete[] client;
 648                         return true;
 649                 }
 650                 break;
 651                 case I_CONNECTED:
 652                         /* Process the read event */
 653                         return this->OnDataReady();
 654                 break;
 655                 default:
 656                 break;
 657         }
 658         return true;
 659 }
 660
 661 void BufferedSocket::SetState(BufferedSocketState s)
 662 {
 663         this->state = s;
 664 }
 665
 666 BufferedSocketState BufferedSocket::GetState()
 667 {
 668         return this->state;
 669 }
 670
 671 int BufferedSocket::GetFd()
 672 {
 673         return this->fd;
 674 }
 675
 676 bool BufferedSocket::OnConnected() { return true; }
 677 void BufferedSocket::OnError(BufferedSocketError) { return; }
 678 int BufferedSocket::OnDisconnect() { return 0; }
 679 int BufferedSocket::OnIncomingConnection(int, char*) { return 0; }
 680 bool BufferedSocket::OnDataReady() { return true; }
 681 bool BufferedSocket::OnWriteReady() { return true; }
 682 void BufferedSocket::OnTimeout() { return; }
 683 void BufferedSocket::OnClose() { return; }
 684
 685 BufferedSocket::~BufferedSocket()
 686 {
 687         this->Close();
 688         if (Timeout)
 689         {
 690                 Instance->Timers->DelTimer(Timeout);
 691                 Timeout = NULL;
 692         }
 693 }
 694
 695 void BufferedSocket::HandleEvent(EventType et, int errornum)
 696 {
 697         switch (et)
 698         {
 699                 case EVENT_ERROR:
 700                         switch (errornum)
 701                         {
 702                                 case ETIMEDOUT:
 703                                         this->OnError(I_ERR_TIMEOUT);
 704                                 break;
 705                                 case ECONNREFUSED:
 706                                 case 0:
 707                                         this->OnError(this->state == I_CONNECTING ? I_ERR_CONNECT : I_ERR_WRITE);
 708                                 break;
 709                                 case EADDRINUSE:
 710                                         this->OnError(I_ERR_BIND);
 711                                 break;
 712                                 case EPIPE:
 713                                 case EIO:
 714                                         this->OnError(I_ERR_WRITE);
 715                                 break;
 716                         }
 717                         if (this->Instance->SocketCull.find(this) == this->Instance->SocketCull.end())
 718                                 this->Instance->SocketCull[this] = this;
 719                         return;
 720                 break;
 721                 case EVENT_READ:
 722                         if (!this->Poll())
 723                         {
 724                                 if (this->Instance->SocketCull.find(this) == this->Instance->SocketCull.end())
 725                                         this->Instance->SocketCull[this] = this;
 726                                 return;
 727                         }
 728                 break;
 729                 case EVENT_WRITE:
 730                         if (this->WaitingForWriteEvent)
 731                         {
 732                                 this->WaitingForWriteEvent = false;
 733                                 if (!this->OnWriteReady())
 734                                 {
 735                                         if (this->Instance->SocketCull.find(this) == this->Instance->SocketCull.end())
 736                                                 this->Instance->SocketCull[this] = this;
 737                                         return;
 738                                 }
 739                         }
 740                         if (this->state == I_CONNECTING)
 741                         {
 742                                 /* This might look wrong as if we should be actually calling
 743                                  * with EVENT_WRITE, but trust me it is correct. There are some
 744                                  * writeability-state things in the read code, because of how
 745                                  * BufferedSocket used to work regarding write buffering in previous
 746                                  * versions of InspIRCd. - Brain
 747                                  */
 748                                 this->HandleEvent(EVENT_READ);
 749                                 return;
 750                         }
 751                         else
 752                         {
 753                                 if (this->FlushWriteBuffer())
 754                                 {
 755                                         if (this->Instance->SocketCull.find(this) == this->Instance->SocketCull.end())
 756                                                 this->Instance->SocketCull[this] = this;
 757                                         return;
 758                                 }
 759                         }
 760                 break;
 761         }
 762 }
 763