src/inspsocket.cpp

   1 /*
   2  * InspIRCd -- Internet Relay Chat Daemon
   3  *
   4  *   Copyright (C) 2009 Daniel De Graaf <danieldg@inspircd.org>
   5  *   Copyright (C) 2007-2009 Robin Burchell <robin+git@viroteck.net>
   6  *   Copyright (C) 2008 Thomas Stagner <aquanight@inspircd.org>
   7  *   Copyright (C) 2006-2007 Craig Edwards <craigedwards@brainbox.cc>
   8  *   Copyright (C) 2007 Dennis Friis <peavey@inspircd.org>
   9  *   Copyright (C) 2006 Oliver Lupton <oliverlupton@gmail.com>
  10  *
  11  * This file is part of InspIRCd.  InspIRCd is free software: you can
  12  * redistribute it and/or modify it under the terms of the GNU General Public
  13  * License as published by the Free Software Foundation, version 2.
  14  *
  15  * This program is distributed in the hope that it will be useful, but WITHOUT
  16  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
  17  * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
  18  * details.
  19  *
  20  * You should have received a copy of the GNU General Public License
  21  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  22  */
  23
  24
  25 #include "inspircd.h"
  26 #include "socket.h"
  27 #include "inspstring.h"
  28 #include "socketengine.h"
  29 #include "iohook.h"
  30
  31 #ifndef DISABLE_WRITEV
  32 #include <sys/uio.h>
  33 #endif
  34
  35 #ifndef IOV_MAX
  36 #define IOV_MAX 1024
  37 #endif
  38
  39 BufferedSocket::BufferedSocket()
  40 {
  41         Timeout = NULL;
  42         state = I_ERROR;
  43 }
  44
  45 BufferedSocket::BufferedSocket(int newfd)
  46 {
  47         Timeout = NULL;
  48         this->fd = newfd;
  49         this->state = I_CONNECTED;
  50         if (fd > -1)
  51                 ServerInstance->SE->AddFd(this, FD_WANT_FAST_READ | FD_WANT_EDGE_WRITE);
  52 }
  53
  54 void BufferedSocket::DoConnect(const std::string &ipaddr, int aport, unsigned long maxtime, const std::string &connectbindip)
  55 {
  56         BufferedSocketError err = BeginConnect(ipaddr, aport, maxtime, connectbindip);
  57         if (err != I_ERR_NONE)
  58         {
  59                 state = I_ERROR;
  60                 SetError(strerror(errno));
  61                 OnError(err);
  62         }
  63 }
  64
  65 BufferedSocketError BufferedSocket::BeginConnect(const std::string &ipaddr, int aport, unsigned long maxtime, const std::string &connectbindip)
  66 {
  67         irc::sockets::sockaddrs addr, bind;
  68         if (!irc::sockets::aptosa(ipaddr, aport, addr))
  69         {
  70                 ServerInstance->Logs->Log("SOCKET", LOG_DEBUG, "BUG: Hostname passed to BufferedSocket, rather than an IP address!");
  71                 return I_ERR_CONNECT;
  72         }
  73
  74         bind.sa.sa_family = 0;
  75         if (!connectbindip.empty())
  76         {
  77                 if (!irc::sockets::aptosa(connectbindip, 0, bind))
  78                 {
  79                         return I_ERR_BIND;
  80                 }
  81         }
  82
  83         return BeginConnect(addr, bind, maxtime);
  84 }
  85
  86 BufferedSocketError BufferedSocket::BeginConnect(const irc::sockets::sockaddrs& dest, const irc::sockets::sockaddrs& bind, unsigned long timeout)
  87 {
  88         if (fd < 0)
  89                 fd = socket(dest.sa.sa_family, SOCK_STREAM, 0);
  90
  91         if (fd < 0)
  92                 return I_ERR_SOCKET;
  93
  94         if (bind.sa.sa_family != 0)
  95         {
  96                 if (ServerInstance->SE->Bind(fd, bind) < 0)
  97                         return I_ERR_BIND;
  98         }
  99
 100         ServerInstance->SE->NonBlocking(fd);
 101
 102         if (ServerInstance->SE->Connect(this, &dest.sa, dest.sa_size()) == -1)
 103         {
 104                 if (errno != EINPROGRESS)
 105                         return I_ERR_CONNECT;
 106         }
 107
 108         this->state = I_CONNECTING;
 109
 110         if (!ServerInstance->SE->AddFd(this, FD_WANT_NO_READ | FD_WANT_SINGLE_WRITE | FD_WRITE_WILL_BLOCK))
 111                 return I_ERR_NOMOREFDS;
 112
 113         this->Timeout = new SocketTimeout(this->GetFd(), this, timeout, ServerInstance->Time());
 114         ServerInstance->Timers->AddTimer(this->Timeout);
 115
 116         ServerInstance->Logs->Log("SOCKET", LOG_DEBUG, "BufferedSocket::DoConnect success");
 117         return I_ERR_NONE;
 118 }
 119
 120 void StreamSocket::Close()
 121 {
 122         if (this->fd > -1)
 123         {
 124                 // final chance, dump as much of the sendq as we can
 125                 DoWrite();
 126                 if (GetIOHook())
 127                 {
 128                         try
 129                         {
 130                                 GetIOHook()->OnStreamSocketClose(this);
 131                         }
 132                         catch (CoreException& modexcept)
 133                         {
 134                                 ServerInstance->Logs->Log("SOCKET", LOG_DEFAULT, "%s threw an exception: %s",
 135                                         modexcept.GetSource(), modexcept.GetReason());
 136                         }
 137                         DelIOHook();
 138                 }
 139                 ServerInstance->SE->Shutdown(this, 2);
 140                 ServerInstance->SE->DelFd(this);
 141                 ServerInstance->SE->Close(this);
 142                 fd = -1;
 143         }
 144 }
 145
 146 CullResult StreamSocket::cull()
 147 {
 148         Close();
 149         return EventHandler::cull();
 150 }
 151
 152 bool StreamSocket::GetNextLine(std::string& line, char delim)
 153 {
 154         std::string::size_type i = recvq.find(delim);
 155         if (i == std::string::npos)
 156                 return false;
 157         line = recvq.substr(0, i);
 158         // TODO is this the most efficient way to split?
 159         recvq = recvq.substr(i + 1);
 160         return true;
 161 }
 162
 163 void StreamSocket::DoRead()
 164 {
 165         if (GetIOHook())
 166         {
 167                 int rv = -1;
 168                 try
 169                 {
 170                         rv = GetIOHook()->OnStreamSocketRead(this, recvq);
 171                 }
 172                 catch (CoreException& modexcept)
 173                 {
 174                         ServerInstance->Logs->Log("SOCKET", LOG_DEFAULT, "%s threw an exception: %s",
 175                                 modexcept.GetSource(), modexcept.GetReason());
 176                         return;
 177                 }
 178                 if (rv > 0)
 179                         OnDataReady();
 180                 if (rv < 0)
 181                         SetError("Read Error"); // will not overwrite a better error message
 182         }
 183         else
 184         {
 185                 char* ReadBuffer = ServerInstance->GetReadBuffer();
 186                 int n = ServerInstance->SE->Recv(this, ReadBuffer, ServerInstance->Config->NetBufferSize, 0);
 187                 if (n == ServerInstance->Config->NetBufferSize)
 188                 {
 189                         ServerInstance->SE->ChangeEventMask(this, FD_WANT_FAST_READ | FD_ADD_TRIAL_READ);
 190                         recvq.append(ReadBuffer, n);
 191                         OnDataReady();
 192                 }
 193                 else if (n > 0)
 194                 {
 195                         ServerInstance->SE->ChangeEventMask(this, FD_WANT_FAST_READ);
 196                         recvq.append(ReadBuffer, n);
 197                         OnDataReady();
 198                 }
 199                 else if (n == 0)
 200                 {
 201                         error = "Connection closed";
 202                         ServerInstance->SE->ChangeEventMask(this, FD_WANT_NO_READ | FD_WANT_NO_WRITE);
 203                 }
 204                 else if (SocketEngine::IgnoreError())
 205                 {
 206                         ServerInstance->SE->ChangeEventMask(this, FD_WANT_FAST_READ | FD_READ_WILL_BLOCK);
 207                 }
 208                 else if (errno == EINTR)
 209                 {
 210                         ServerInstance->SE->ChangeEventMask(this, FD_WANT_FAST_READ | FD_ADD_TRIAL_READ);
 211                 }
 212                 else
 213                 {
 214                         error = strerror(errno);
 215                         ServerInstance->SE->ChangeEventMask(this, FD_WANT_NO_READ | FD_WANT_NO_WRITE);
 216                 }
 217         }
 218 }
 219
 220 /* Don't try to prepare huge blobs of data to send to a blocked socket */
 221 static const int MYIOV_MAX = IOV_MAX < 128 ? IOV_MAX : 128;
 222
 223 void StreamSocket::DoWrite()
 224 {
 225         if (sendq.empty())
 226                 return;
 227         if (!error.empty() || fd < 0 || fd == INT_MAX)
 228         {
 229                 ServerInstance->Logs->Log("SOCKET", LOG_DEBUG, "DoWrite on errored or closed socket");
 230                 return;
 231         }
 232
 233 #ifndef DISABLE_WRITEV
 234         if (GetIOHook())
 235 #endif
 236         {
 237                 int rv = -1;
 238                 try
 239                 {
 240                         while (error.empty() && !sendq.empty())
 241                         {
 242                                 if (sendq.size() > 1 && sendq[0].length() < 1024)
 243                                 {
 244                                         // Avoid multiple repeated SSL encryption invocations
 245                                         // This adds a single copy of the queue, but avoids
 246                                         // much more overhead in terms of system calls invoked
 247                                         // by the IOHook.
 248                                         //
 249                                         // The length limit of 1024 is to prevent merging strings
 250                                         // more than once when writes begin to block.
 251                                         std::string tmp;
 252                                         tmp.reserve(sendq_len);
 253                                         for(unsigned int i=0; i < sendq.size(); i++)
 254                                                 tmp.append(sendq[i]);
 255                                         sendq.clear();
 256                                         sendq.push_back(tmp);
 257                                 }
 258                                 std::string& front = sendq.front();
 259                                 int itemlen = front.length();
 260                                 if (GetIOHook())
 261                                 {
 262                                         rv = GetIOHook()->OnStreamSocketWrite(this, front);
 263                                         if (rv > 0)
 264                                         {
 265                                                 // consumed the entire string, and is ready for more
 266                                                 sendq_len -= itemlen;
 267                                                 sendq.pop_front();
 268                                         }
 269                                         else if (rv == 0)
 270                                         {
 271                                                 // socket has blocked. Stop trying to send data.
 272                                                 // IOHook has requested unblock notification from the socketengine
 273
 274                                                 // Since it is possible that a partial write took place, adjust sendq_len
 275                                                 sendq_len = sendq_len - itemlen + front.length();
 276                                                 return;
 277                                         }
 278                                         else
 279                                         {
 280                                                 SetError("Write Error"); // will not overwrite a better error message
 281                                                 return;
 282                                         }
 283                                 }
 284 #ifdef DISABLE_WRITEV
 285                                 else
 286                                 {
 287                                         rv = ServerInstance->SE->Send(this, front.data(), itemlen, 0);
 288                                         if (rv == 0)
 289                                         {
 290                                                 SetError("Connection closed");
 291                                                 return;
 292                                         }
 293                                         else if (rv < 0)
 294                                         {
 295                                                 if (errno == EINTR || SocketEngine::IgnoreError())
 296                                                         ServerInstance->SE->ChangeEventMask(this, FD_WANT_FAST_WRITE | FD_WRITE_WILL_BLOCK);
 297                                                 else
 298                                                         SetError(strerror(errno));
 299                                                 return;
 300                                         }
 301                                         else if (rv < itemlen)
 302                                         {
 303                                                 ServerInstance->SE->ChangeEventMask(this, FD_WANT_FAST_WRITE | FD_WRITE_WILL_BLOCK);
 304                                                 front = front.substr(rv);
 305                                                 sendq_len -= rv;
 306                                                 return;
 307                                         }
 308                                         else
 309                                         {
 310                                                 sendq_len -= itemlen;
 311                                                 sendq.pop_front();
 312                                                 if (sendq.empty())
 313                                                         ServerInstance->SE->ChangeEventMask(this, FD_WANT_EDGE_WRITE);
 314                                         }
 315                                 }
 316 #endif
 317                         }
 318                 }
 319                 catch (CoreException& modexcept)
 320                 {
 321                         ServerInstance->Logs->Log("SOCKET", LOG_DEBUG, "%s threw an exception: %s",
 322                                 modexcept.GetSource(), modexcept.GetReason());
 323                 }
 324         }
 325 #ifndef DISABLE_WRITEV
 326         else
 327         {
 328                 // don't even try if we are known to be blocking
 329                 if (GetEventMask() & FD_WRITE_WILL_BLOCK)
 330                         return;
 331                 // start out optimistic - we won't need to write any more
 332                 int eventChange = FD_WANT_EDGE_WRITE;
 333                 while (error.empty() && sendq_len && eventChange == FD_WANT_EDGE_WRITE)
 334                 {
 335                         // Prepare a writev() call to write all buffers efficiently
 336                         int bufcount = sendq.size();
 337
 338                         // cap the number of buffers at MYIOV_MAX
 339                         if (bufcount > MYIOV_MAX)
 340                         {
 341                                 bufcount = MYIOV_MAX;
 342                         }
 343
 344                         int rv_max = 0;
 345                         iovec* iovecs = new iovec[bufcount];
 346                         for(int i=0; i < bufcount; i++)
 347                         {
 348                                 iovecs[i].iov_base = const_cast<char*>(sendq[i].data());
 349                                 iovecs[i].iov_len = sendq[i].length();
 350                                 rv_max += sendq[i].length();
 351                         }
 352                         int rv = writev(fd, iovecs, bufcount);
 353                         delete[] iovecs;
 354
 355                         if (rv == (int)sendq_len)
 356                         {
 357                                 // it's our lucky day, everything got written out. Fast cleanup.
 358                                 // This won't ever happen if the number of buffers got capped.
 359                                 sendq_len = 0;
 360                                 sendq.clear();
 361                         }
 362                         else if (rv > 0)
 363                         {
 364                                 // Partial write. Clean out strings from the sendq
 365                                 if (rv < rv_max)
 366                                 {
 367                                         // it's going to block now
 368                                         eventChange = FD_WANT_FAST_WRITE | FD_WRITE_WILL_BLOCK;
 369                                 }
 370                                 sendq_len -= rv;
 371                                 while (rv > 0 && !sendq.empty())
 372                                 {
 373                                         std::string& front = sendq.front();
 374                                         if (front.length() <= (size_t)rv)
 375                                         {
 376                                                 // this string got fully written out
 377                                                 rv -= front.length();
 378                                                 sendq.pop_front();
 379                                         }
 380                                         else
 381                                         {
 382                                                 // stopped in the middle of this string
 383                                                 front = front.substr(rv);
 384                                                 rv = 0;
 385                                         }
 386                                 }
 387                         }
 388                         else if (rv == 0)
 389                         {
 390                                 error = "Connection closed";
 391                         }
 392                         else if (SocketEngine::IgnoreError())
 393                         {
 394                                 eventChange = FD_WANT_FAST_WRITE | FD_WRITE_WILL_BLOCK;
 395                         }
 396                         else if (errno == EINTR)
 397                         {
 398                                 // restart interrupted syscall
 399                                 errno = 0;
 400                         }
 401                         else
 402                         {
 403                                 error = strerror(errno);
 404                         }
 405                 }
 406                 if (!error.empty())
 407                 {
 408                         // error - kill all events
 409                         ServerInstance->SE->ChangeEventMask(this, FD_WANT_NO_READ | FD_WANT_NO_WRITE);
 410                 }
 411                 else
 412                 {
 413                         ServerInstance->SE->ChangeEventMask(this, eventChange);
 414                 }
 415         }
 416 #endif
 417 }
 418
 419 void StreamSocket::WriteData(const std::string &data)
 420 {
 421         if (fd < 0)
 422         {
 423                 ServerInstance->Logs->Log("SOCKET", LOG_DEBUG, "Attempt to write data to dead socket: %s",
 424                         data.c_str());
 425                 return;
 426         }
 427
 428         /* Append the data to the back of the queue ready for writing */
 429         sendq.push_back(data);
 430         sendq_len += data.length();
 431
 432         ServerInstance->SE->ChangeEventMask(this, FD_ADD_TRIAL_WRITE);
 433 }
 434
 435 bool SocketTimeout::Tick(time_t)
 436 {
 437         ServerInstance->Logs->Log("SOCKET", LOG_DEBUG, "SocketTimeout::Tick");
 438
 439         if (ServerInstance->SE->GetRef(this->sfd) != this->sock)
 440                 return false;
 441
 442         if (this->sock->state == I_CONNECTING)
 443         {
 444                 // for connecting sockets, the timeout can occur
 445                 // which causes termination of the connection after
 446                 // the given number of seconds without a successful
 447                 // connection.
 448                 this->sock->OnTimeout();
 449                 this->sock->OnError(I_ERR_TIMEOUT);
 450                 this->sock->state = I_ERROR;
 451
 452                 ServerInstance->GlobalCulls.AddItem(sock);
 453         }
 454
 455         this->sock->Timeout = NULL;
 456         return false;
 457 }
 458
 459 void BufferedSocket::OnConnected() { }
 460 void BufferedSocket::OnTimeout() { return; }
 461
 462 void BufferedSocket::DoWrite()
 463 {
 464         if (state == I_CONNECTING)
 465         {
 466                 state = I_CONNECTED;
 467                 this->OnConnected();
 468                 if (GetIOHook())
 469                         GetIOHook()->OnStreamSocketConnect(this);
 470                 else
 471                         ServerInstance->SE->ChangeEventMask(this, FD_WANT_FAST_READ | FD_WANT_EDGE_WRITE);
 472         }
 473         this->StreamSocket::DoWrite();
 474 }
 475
 476 BufferedSocket::~BufferedSocket()
 477 {
 478         this->Close();
 479         if (Timeout)
 480         {
 481                 // The timer is removed from the TimerManager in Timer::~Timer()
 482                 delete Timeout;
 483         }
 484 }
 485
 486 void StreamSocket::HandleEvent(EventType et, int errornum)
 487 {
 488         if (!error.empty())
 489                 return;
 490         BufferedSocketError errcode = I_ERR_OTHER;
 491         try {
 492                 switch (et)
 493                 {
 494                         case EVENT_ERROR:
 495                         {
 496                                 if (errornum == 0)
 497                                         SetError("Connection closed");
 498                                 else
 499                                         SetError(strerror(errornum));
 500                                 switch (errornum)
 501                                 {
 502                                         case ETIMEDOUT:
 503                                                 errcode = I_ERR_TIMEOUT;
 504                                                 break;
 505                                         case ECONNREFUSED:
 506                                         case 0:
 507                                                 errcode = I_ERR_CONNECT;
 508                                                 break;
 509                                         case EADDRINUSE:
 510                                                 errcode = I_ERR_BIND;
 511                                                 break;
 512                                         case EPIPE:
 513                                         case EIO:
 514                                                 errcode = I_ERR_WRITE;
 515                                                 break;
 516                                 }
 517                                 break;
 518                         }
 519                         case EVENT_READ:
 520                         {
 521                                 DoRead();
 522                                 break;
 523                         }
 524                         case EVENT_WRITE:
 525                         {
 526                                 DoWrite();
 527                                 break;
 528                         }
 529                 }
 530         }
 531         catch (CoreException& ex)
 532         {
 533                 ServerInstance->Logs->Log("SOCKET", LOG_DEFAULT, "Caught exception in socket processing on FD %d - '%s'",
 534                         fd, ex.GetReason());
 535                 SetError(ex.GetReason());
 536         }
 537         if (!error.empty())
 538         {
 539                 ServerInstance->Logs->Log("SOCKET", LOG_DEBUG, "Error on FD %d - '%s'", fd, error.c_str());
 540                 OnError(errcode);
 541         }
 542 }
 543