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                                 if (this->fd > -1)
  83                                 {
  84                                         if (!this->Instance->SE->AddFd(this))
  85                                         {
  86                                                 this->Close();
  87                                                 this->state = I_ERROR;
  88                                                 this->OnError(I_ERR_NOMOREFDS);
  89                                         }
  90                                 }
  91                                 return;
  92                         }
  93                 }
  94         }
  95         else
  96         {
  97                 strlcpy(this->host,ipaddr.c_str(),MAXBUF);
  98                 this->port = aport;
  99
 100                 bool ipvalid = true;
 101 #ifdef IPV6
 102                 if (strchr(host,':'))
 103                 {
 104                         in6_addr n;
 105                         if (inet_pton(AF_INET6, host, &n) < 1)
 106                                 ipvalid = false;
 107                 }
 108                 else
 109                 {
 110                         in_addr n;
 111                         if (inet_aton(host,&n) < 1)
 112                                 ipvalid = false;
 113                 }
 114 #else
 115                 in_addr n;
 116                 if (inet_aton(host,&n) < 1)
 117                         ipvalid = false;
 118 #endif
 119                 if (!ipvalid)
 120                 {
 121                         this->Instance->Log(DEBUG,"BUG: Hostname passed to InspSocket, rather than an IP address!");
 122                         this->Close();
 123                         this->fd = -1;
 124                         this->state = I_ERROR;
 125                         this->OnError(I_ERR_RESOLVE);
 126                         return;
 127                 }
 128                 else
 129                 {
 130                         strlcpy(this->IP,host,MAXBUF);
 131                         timeout_val = maxtime;
 132                         if (!this->DoConnect())
 133                         {
 134                                 this->Close();
 135                                 this->fd = -1;
 136                                 this->state = I_ERROR;
 137                                 this->OnError(I_ERR_CONNECT);
 138                                 return;
 139                         }
 140                 }
 141         }
 142 }
 143
 144 void InspSocket::WantWrite()
 145 {
 146         this->Instance->SE->WantWrite(this);
 147         this->WaitingForWriteEvent = true;
 148 }
 149
 150 void InspSocket::SetQueues(int nfd)
 151 {
 152         // attempt to increase socket sendq and recvq as high as its possible
 153         int sendbuf = 32768;
 154         int recvbuf = 32768;
 155         setsockopt(nfd,SOL_SOCKET,SO_SNDBUF,(const void *)&sendbuf,sizeof(sendbuf));
 156         setsockopt(nfd,SOL_SOCKET,SO_RCVBUF,(const void *)&recvbuf,sizeof(sendbuf));
 157 }
 158
 159 /* Most irc servers require you to specify the ip you want to bind to.
 160  * If you dont specify an IP, they rather dumbly bind to the first IP
 161  * of the box (e.g. INADDR_ANY). In InspIRCd, we scan thought the IP
 162  * addresses we've bound server ports to, and we try and bind our outbound
 163  * connections to the first usable non-loopback and non-any IP we find.
 164  * This is easier to configure when you have a lot of links and a lot
 165  * of servers to configure.
 166  */
 167 bool InspSocket::BindAddr(const std::string &ip)
 168 {
 169         ConfigReader Conf(this->Instance);
 170         socklen_t size = sizeof(sockaddr_in);
 171 #ifdef IPV6
 172         bool v6 = false;
 173         /* Are we looking for a binding to fit an ipv6 host? */
 174         if ((ip.empty()) || (ip.find(':') != std::string::npos))
 175                 v6 = true;
 176 #endif
 177         int j = 0;
 178         while (j < Conf.Enumerate("bind") || (!ip.empty()))
 179         {
 180                 std::string IP = ip.empty() ? Conf.ReadValue("bind","address",j) : ip;
 181                 if (!ip.empty() || Conf.ReadValue("bind","type",j) == "servers")
 182                 {
 183                         if (!ip.empty() || ((IP != "*") && (IP != "127.0.0.1") && (IP != "") && (IP != "::1")))
 184                         {
 185                                 sockaddr* s = new sockaddr[2];
 186 #ifdef IPV6
 187                                 if (v6)
 188                                 {
 189                                         in6_addr n;
 190                                         if (inet_pton(AF_INET6, IP.c_str(), &n) > 0)
 191                                         {
 192                                                 memcpy(&((sockaddr_in6*)s)->sin6_addr, &n, sizeof(n));
 193                                                 ((sockaddr_in6*)s)->sin6_port = 0;
 194                                                 ((sockaddr_in6*)s)->sin6_family = AF_INET6;
 195                                                 size = sizeof(sockaddr_in6);
 196                                         }
 197                                         else
 198                                         {
 199                                                 delete[] s;
 200                                                 j++;
 201                                                 continue;
 202                                         }
 203                                 }
 204                                 else
 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 #else
 221                                 in_addr n;
 222                                 if (insp_aton(IP.c_str(), &n) > 0)
 223                                 {
 224                                         ((sockaddr_in*)s)->sin_addr = n;
 225                                         ((sockaddr_in*)s)->sin_port = 0;
 226                                         ((sockaddr_in*)s)->sin_family = AF_INET;
 227                                 }
 228                                 else
 229                                 {
 230                                         delete[] s;
 231                                         j++;
 232                                         continue;
 233                                 }
 234 #endif
 235
 236                                 if (bind(this->fd, s, size) < 0)
 237                                 {
 238                                         this->state = I_ERROR;
 239                                         this->OnError(I_ERR_BIND);
 240                                         this->fd = -1;
 241                                         delete[] s;
 242                                         return false;
 243                                 }
 244
 245                                 delete[] s;
 246                                 return true;
 247                         }
 248                 }
 249                 j++;
 250         }
 251         return true;
 252 }
 253
 254 bool InspSocket::DoConnect()
 255 {
 256         sockaddr* addr = new sockaddr[2];
 257         socklen_t size = sizeof(sockaddr_in);
 258 #ifdef IPV6
 259         bool v6 = false;
 260         if ((!*this->host) || strchr(this->host, ':'))
 261                 v6 = true;
 262
 263         if (v6)
 264         {
 265                 this->fd = socket(AF_INET6, SOCK_STREAM, 0);
 266                 if ((this->fd > -1) && ((strstr(this->IP,"::ffff:") != (char*)&this->IP) && (strstr(this->IP,"::FFFF:") != (char*)&this->IP)))
 267                 {
 268                         if (!this->BindAddr(this->cbindip))
 269                         {
 270                                 delete[] addr;
 271                                 return false;
 272                         }
 273                 }
 274         }
 275         else
 276         {
 277                 this->fd = socket(AF_INET, SOCK_STREAM, 0);
 278                 if (this->fd > -1)
 279                 {
 280                         if (!this->BindAddr(this->cbindip))
 281                         {
 282                                 delete[] addr;
 283                                 return false;
 284                         }
 285                 }
 286         }
 287 #else
 288         this->fd = socket(AF_INET, SOCK_STREAM, 0);
 289         if (this->fd > -1)
 290         {
 291                 if (!this->BindAddr(this->cbindip))
 292                 {
 293                         delete[] addr;
 294                         return false;
 295                 }
 296         }
 297 #endif
 298
 299         if (this->fd == -1)
 300         {
 301                 this->state = I_ERROR;
 302                 this->OnError(I_ERR_SOCKET);
 303                 delete[] addr;
 304                 return false;
 305         }
 306
 307 #ifdef IPV6
 308         if (v6)
 309         {
 310                 in6_addr addy;
 311                 if (inet_pton(AF_INET6, this->host, &addy) > 0)
 312                 {
 313                         ((sockaddr_in6*)addr)->sin6_family = AF_INET6;
 314                         memcpy(&((sockaddr_in6*)addr)->sin6_addr, &addy, sizeof(addy));
 315                         ((sockaddr_in6*)addr)->sin6_port = htons(this->port);
 316                         size = sizeof(sockaddr_in6);
 317                 }
 318         }
 319         else
 320         {
 321                 in_addr addy;
 322                 if (inet_aton(this->host, &addy) > 0)
 323                 {
 324                         ((sockaddr_in*)addr)->sin_family = AF_INET;
 325                         ((sockaddr_in*)addr)->sin_addr = addy;
 326                         ((sockaddr_in*)addr)->sin_port = htons(this->port);
 327                 }
 328         }
 329 #else
 330         in_addr addy;
 331         if (inet_aton(this->host, &addy) > 0)
 332         {
 333                 ((sockaddr_in*)addr)->sin_family = AF_INET;
 334                 ((sockaddr_in*)addr)->sin_addr = addy;
 335                 ((sockaddr_in*)addr)->sin_port = htons(this->port);
 336         }
 337 #endif
 338
 339         int flags = fcntl(this->fd, F_GETFL, 0);
 340         fcntl(this->fd, F_SETFL, flags | O_NONBLOCK);
 341
 342         if (connect(this->fd, (sockaddr*)addr, size) == -1)
 343         {
 344                 if (errno != EINPROGRESS)
 345                 {
 346                         this->OnError(I_ERR_CONNECT);
 347                         this->Close();
 348                         this->state = I_ERROR;
 349                         return false;
 350                 }
 351
 352                 this->Timeout = new SocketTimeout(this->GetFd(), this->Instance, this, timeout_val, this->Instance->Time());
 353                 this->Instance->Timers->AddTimer(this->Timeout);
 354         }
 355         this->state = I_CONNECTING;
 356         if (this->fd > -1)
 357         {
 358                 if (!this->Instance->SE->AddFd(this))
 359                 {
 360                         this->OnError(I_ERR_NOMOREFDS);
 361                         this->Close();
 362                         this->state = I_ERROR;
 363                         return false;
 364                 }
 365                 this->SetQueues(this->fd);
 366         }
 367         return true;
 368 }
 369
 370
 371 void InspSocket::Close()
 372 {
 373         /* Save this, so we dont lose it,
 374          * otherise on failure, error messages
 375          * might be inaccurate.
 376          */
 377         int save = errno;
 378         if (this->fd > -1)
 379         {
 380                 if (this->IsIOHooked && Instance->Config->GetIOHook(this))
 381                 {
 382                         try
 383                         {
 384                                 Instance->Config->GetIOHook(this)->OnRawSocketClose(this->fd);
 385                         }
 386                         catch (CoreException& modexcept)
 387                         {
 388                                 Instance->Log(DEFAULT,"%s threw an exception: %s", modexcept.GetSource(), modexcept.GetReason());
 389                         }
 390                 }
 391                 this->OnClose();
 392                 shutdown(this->fd,2);
 393                 close(this->fd);
 394         }
 395         errno = save;
 396 }
 397
 398 std::string InspSocket::GetIP()
 399 {
 400         return this->IP;
 401 }
 402
 403 char* InspSocket::Read()
 404 {
 405         if ((fd < 0) || (fd > MAX_DESCRIPTORS))
 406                 return NULL;
 407
 408         int n = 0;
 409
 410         if (this->IsIOHooked)
 411         {
 412                 int result2 = 0;
 413                 int MOD_RESULT = 0;
 414                 try
 415                 {
 416                         MOD_RESULT = Instance->Config->GetIOHook(this)->OnRawSocketRead(this->fd,this->ibuf,sizeof(this->ibuf),result2);
 417                 }
 418                 catch (CoreException& modexcept)
 419                 {
 420                         Instance->Log(DEFAULT,"%s threw an exception: %s", modexcept.GetSource(), modexcept.GetReason());
 421                 }
 422                 if (MOD_RESULT < 0)
 423                 {
 424                         n = -1;
 425                         errno = EAGAIN;
 426                 }
 427                 else
 428                 {
 429                         n = result2;
 430                 }
 431         }
 432         else
 433         {
 434                 n = recv(this->fd,this->ibuf,sizeof(this->ibuf),0);
 435         }
 436
 437         if ((n > 0) && (n <= (int)sizeof(this->ibuf)))
 438         {
 439                 ibuf[n] = 0;
 440                 return ibuf;
 441         }
 442         else
 443         {
 444                 int err = errno;
 445                 if (err == EAGAIN)
 446                         return "";
 447                 else
 448                         return NULL;
 449         }
 450 }
 451
 452 void InspSocket::MarkAsClosed()
 453 {
 454 }
 455
 456 // There are two possible outcomes to this function.
 457 // It will either write all of the data, or an undefined amount.
 458 // If an undefined amount is written the connection has failed
 459 // and should be aborted.
 460 int InspSocket::Write(const std::string &data)
 461 {
 462         /* Try and append the data to the back of the queue, and send it on its way
 463          */
 464         outbuffer.push_back(data);
 465         this->Instance->SE->WantWrite(this);
 466         return (!this->FlushWriteBuffer());
 467 }
 468
 469 bool InspSocket::FlushWriteBuffer()
 470 {
 471         errno = 0;
 472         if ((this->fd > -1) && (this->state == I_CONNECTED))
 473         {
 474                 if (this->IsIOHooked)
 475                 {
 476                         while (outbuffer.size() && (errno != EAGAIN))
 477                         {
 478                                 try
 479                                 {
 480                                         int result = Instance->Config->GetIOHook(this)->OnRawSocketWrite(this->fd, outbuffer[0].c_str(), outbuffer[0].length());
 481                                         if (result > 0)
 482                                         {
 483                                                 if ((unsigned int)result >= outbuffer[0].length())
 484                                                 {
 485                                                         outbuffer.pop_front();
 486                                                 }
 487                                                 else
 488                                                 {
 489                                                         std::string temp = outbuffer[0].substr(result);
 490                                                         outbuffer[0] = temp;
 491                                                         errno = EAGAIN;
 492                                                 }
 493                                         }
 494                                         else if (((result == -1) && (errno != EAGAIN)) || (result == 0))
 495                                         {
 496                                                 this->OnError(I_ERR_WRITE);
 497                                                 this->state = I_ERROR;
 498                                                 this->Instance->SE->DelFd(this);
 499                                                 this->Close();
 500                                                 return true;
 501                                         }
 502                                 }
 503                                 catch (CoreException& modexcept)
 504                                 {
 505                                         Instance->Log(DEBUG,"%s threw an exception: %s", modexcept.GetSource(), modexcept.GetReason());
 506                                         return true;
 507                                 }
 508                         }
 509                 }
 510                 else
 511                 {
 512                         /* If we have multiple lines, try to send them all,
 513                          * not just the first one -- Brain
 514                          */
 515                         while (outbuffer.size() && (errno != EAGAIN))
 516                         {
 517                                 /* Send a line */
 518                                 int result = write(this->fd,outbuffer[0].c_str(),outbuffer[0].length());
 519                                 if (result > 0)
 520                                 {
 521                                         if ((unsigned int)result >= outbuffer[0].length())
 522                                         {
 523                                                 /* The whole block was written (usually a line)
 524                                                  * Pop the block off the front of the queue,
 525                                                  * dont set errno, because we are clear of errors
 526                                                  * and want to try and write the next block too.
 527                                                  */
 528                                                 outbuffer.pop_front();
 529                                         }
 530                                         else
 531                                         {
 532                                                 std::string temp = outbuffer[0].substr(result);
 533                                                 outbuffer[0] = temp;
 534                                                 /* We didnt get the whole line out. arses.
 535                                                  * Try again next time, i guess. Set errno,
 536                                                  * because we shouldnt be writing any more now,
 537                                                  * until the socketengine says its safe to do so.
 538                                                  */
 539                                                 errno = EAGAIN;
 540                                         }
 541                                 }
 542                                 else if ((result == -1) && (errno != EAGAIN))
 543                                 {
 544                                         this->OnError(I_ERR_WRITE);
 545                                         this->state = I_ERROR;
 546                                         this->Instance->SE->DelFd(this);
 547                                         this->Close();
 548                                         return true;
 549                                 }
 550                         }
 551                 }
 552         }
 553
 554         if ((errno == EAGAIN) && (fd > -1))
 555         {
 556                 this->Instance->SE->WantWrite(this);
 557         }
 558
 559         return (fd < 0);
 560 }
 561
 562 void SocketTimeout::Tick(time_t now)
 563 {
 564         if (ServerInstance->SE->GetRef(this->sfd) != this->sock)
 565                 return;
 566
 567         if (this->sock->state == I_CONNECTING)
 568         {
 569                 // for non-listening sockets, the timeout can occur
 570                 // which causes termination of the connection after
 571                 // the given number of seconds without a successful
 572                 // connection.
 573                 this->sock->OnTimeout();
 574                 this->sock->OnError(I_ERR_TIMEOUT);
 575                 this->sock->timeout = true;
 576
 577                 /* NOTE: We must set this AFTER DelFd, as we added
 578                  * this socket whilst writeable. This means that we
 579                  * must DELETE the socket whilst writeable too!
 580                  */
 581                 this->sock->state = I_ERROR;
 582
 583                 if (ServerInstance->SocketCull.find(this->sock) == ServerInstance->SocketCull.end())
 584                         ServerInstance->SocketCull[this->sock] = this->sock;
 585         }
 586
 587         this->sock->Timeout = NULL;
 588 }
 589
 590 bool InspSocket::Poll()
 591 {
 592         if (this->Instance->SE->GetRef(this->fd) != this)
 593                 return false;
 594
 595         int incoming = -1;
 596
 597         if ((fd < 0) || (fd > MAX_DESCRIPTORS))
 598                 return false;
 599
 600         switch (this->state)
 601         {
 602                 case I_CONNECTING:
 603                         /* Our socket was in write-state, so delete it and re-add it
 604                          * in read-state.
 605                          */
 606                         if (this->fd > -1)
 607                         {
 608                                 this->Instance->SE->DelFd(this);
 609                                 this->SetState(I_CONNECTED);
 610                                 if (!this->Instance->SE->AddFd(this))
 611                                         return false;
 612                         }
 613                         if (Instance->Config->GetIOHook(this))
 614                         {
 615                                 try
 616                                 {
 617                                         Instance->Config->GetIOHook(this)->OnRawSocketConnect(this->fd);
 618                                 }
 619                                 catch (CoreException& modexcept)
 620                                 {
 621                                         Instance->Log(DEBUG,"%s threw an exception: %s", modexcept.GetSource(), modexcept.GetReason());
 622                                 }
 623                         }
 624                         return this->OnConnected();
 625                 break;
 626                 case I_LISTENING:
 627                 {
 628                         sockaddr* client = new sockaddr[2];
 629                         length = sizeof (sockaddr_in);
 630                         std::string recvip;
 631 #ifdef IPV6
 632                         if ((!*this->host) || strchr(this->host, ':'))
 633                                 length = sizeof(sockaddr_in6);
 634 #endif
 635                         incoming = accept (this->fd, client, &length);
 636 #ifdef IPV6
 637                         if ((!*this->host) || strchr(this->host, ':'))
 638                         {
 639                                 char buf[1024];
 640                                 recvip = inet_ntop(AF_INET6, &((sockaddr_in6*)client)->sin6_addr, buf, sizeof(buf));
 641                         }
 642                         else
 643                         {
 644                                 recvip = inet_ntoa(((sockaddr_in*)client)->sin_addr);
 645                         }
 646 #else
 647                         recvip = inet_ntoa(((sockaddr_in*)client)->sin_addr);
 648 #endif
 649                         this->OnIncomingConnection(incoming, (char*)recvip.c_str());
 650
 651                         if (this->IsIOHooked)
 652                         {
 653                                 try
 654                                 {
 655                                         Instance->Config->GetIOHook(this)->OnRawSocketAccept(incoming, recvip.c_str(), this->port);
 656                                 }
 657                                 catch (CoreException& modexcept)
 658                                 {
 659                                         Instance->Log(DEBUG,"%s threw an exception: %s", modexcept.GetSource(), modexcept.GetReason());
 660                                 }
 661                         }
 662
 663                         this->SetQueues(incoming);
 664
 665                         delete[] client;
 666                         return true;
 667                 }
 668                 break;
 669                 case I_CONNECTED:
 670                         /* Process the read event */
 671                         return this->OnDataReady();
 672                 break;
 673                 default:
 674                 break;
 675         }
 676         return true;
 677 }
 678
 679 void InspSocket::SetState(InspSocketState s)
 680 {
 681         this->state = s;
 682 }
 683
 684 InspSocketState InspSocket::GetState()
 685 {
 686         return this->state;
 687 }
 688
 689 int InspSocket::GetFd()
 690 {
 691         return this->fd;
 692 }
 693
 694 bool InspSocket::OnConnected() { return true; }
 695 void InspSocket::OnError(InspSocketError e) { return; }
 696 int InspSocket::OnDisconnect() { return 0; }
 697 int InspSocket::OnIncomingConnection(int newfd, char* ip) { return 0; }
 698 bool InspSocket::OnDataReady() { return true; }
 699 bool InspSocket::OnWriteReady() { return true; }
 700 void InspSocket::OnTimeout() { return; }
 701 void InspSocket::OnClose() { return; }
 702
 703 InspSocket::~InspSocket()
 704 {
 705         this->Close();
 706         if (Timeout)
 707         {
 708                 Instance->Timers->DelTimer(Timeout);
 709                 Timeout = NULL;
 710         }
 711 }
 712
 713 void InspSocket::HandleEvent(EventType et, int errornum)
 714 {
 715         switch (et)
 716         {
 717                 case EVENT_ERROR:
 718                         if (this->Instance->SocketCull.find(this) == this->Instance->SocketCull.end())
 719                                 this->Instance->SocketCull[this] = this;
 720                         return;
 721                 break;
 722                 case EVENT_READ:
 723                         if (!this->Poll())
 724                         {
 725                                 if (this->Instance->SocketCull.find(this) == this->Instance->SocketCull.end())
 726                                         this->Instance->SocketCull[this] = this;
 727                                 return;
 728                         }
 729                 break;
 730                 case EVENT_WRITE:
 731                         if (this->WaitingForWriteEvent)
 732                         {
 733                                 this->WaitingForWriteEvent = false;
 734                                 if (!this->OnWriteReady())
 735                                 {
 736                                         if (this->Instance->SocketCull.find(this) == this->Instance->SocketCull.end())
 737                                                 this->Instance->SocketCull[this] = this;
 738                                         return;
 739                                 }
 740                         }
 741                         if (this->state == I_CONNECTING)
 742                         {
 743                                 /* This might look wrong as if we should be actually calling
 744                                  * with EVENT_WRITE, but trust me it is correct. There are some
 745                                  * writeability-state things in the read code, because of how
 746                                  * InspSocket used to work regarding write buffering in previous
 747                                  * versions of InspIRCd. - Brain
 748                                  */
 749                                 this->HandleEvent(EVENT_READ);
 750                                 return;
 751                         }
 752                         else
 753                         {
 754                                 if (this->FlushWriteBuffer())
 755                                 {
 756                                         if (this->Instance->SocketCull.find(this) == this->Instance->SocketCull.end())
 757                                                 this->Instance->SocketCull[this] = this;
 758                                         return;
 759                                 }
 760                         }
 761                 break;
 762         }
 763 }
 764