src/inspsocket.cpp

   1 /*       +------------------------------------+
   2  *       | Inspire Internet Relay Chat Daemon |
   3  *       +------------------------------------+
   4  *
   5  *  InspIRCd: (C) 2002-2010 InspIRCd Development Team
   6  * See: http://wiki.inspircd.org/Credits
   7  *
   8  * This program is free but copyrighted software; see
   9  *            the file COPYING for details.
  10  *
  11  * ---------------------------------------------------
  12  */
  13
  14 #include "inspircd.h"
  15 #include "socket.h"
  16 #include "inspstring.h"
  17 #include "socketengine.h"
  18
  19 #ifndef DISABLE_WRITEV
  20 #include <sys/uio.h>
  21 #ifndef IOV_MAX
  22 #define IOV_MAX 1024
  23 #endif
  24 #endif
  25
  26 BufferedSocket::BufferedSocket()
  27 {
  28         Timeout = NULL;
  29         state = I_ERROR;
  30 }
  31
  32 BufferedSocket::BufferedSocket(int newfd)
  33 {
  34         Timeout = NULL;
  35         this->fd = newfd;
  36         this->state = I_CONNECTED;
  37         if (fd > -1)
  38                 ServerInstance->SE->AddFd(this, FD_WANT_FAST_READ | FD_WANT_EDGE_WRITE);
  39 }
  40
  41 void BufferedSocket::DoConnect(const std::string &ipaddr, int aport, unsigned long maxtime, const std::string &connectbindip)
  42 {
  43         BufferedSocketError err = BeginConnect(ipaddr, aport, maxtime, connectbindip);
  44         if (err != I_ERR_NONE)
  45         {
  46                 state = I_ERROR;
  47                 SetError(strerror(errno));
  48                 OnError(err);
  49         }
  50 }
  51
  52 BufferedSocketError BufferedSocket::BeginConnect(const std::string &ipaddr, int aport, unsigned long maxtime, const std::string &connectbindip)
  53 {
  54         irc::sockets::sockaddrs addr, bind;
  55         if (!irc::sockets::aptosa(ipaddr, aport, addr))
  56         {
  57                 ServerInstance->Logs->Log("SOCKET", DEBUG, "BUG: Hostname passed to BufferedSocket, rather than an IP address!");
  58                 return I_ERR_CONNECT;
  59         }
  60
  61         bind.sa.sa_family = 0;
  62         if (!connectbindip.empty())
  63         {
  64                 if (!irc::sockets::aptosa(connectbindip, 0, bind))
  65                 {
  66                         return I_ERR_BIND;
  67                 }
  68         }
  69
  70         return BeginConnect(addr, bind, maxtime);
  71 }
  72
  73 static void IncreaseOSBuffers(int fd)
  74 {
  75         // attempt to increase socket sendq and recvq as high as its possible
  76         int sendbuf = 32768;
  77         int recvbuf = 32768;
  78         setsockopt(fd,SOL_SOCKET,SO_SNDBUF,(const char *)&sendbuf,sizeof(sendbuf));
  79         setsockopt(fd,SOL_SOCKET,SO_RCVBUF,(const char *)&recvbuf,sizeof(recvbuf));
  80         // on failure, 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.
  81 }
  82
  83 BufferedSocketError BufferedSocket::BeginConnect(const irc::sockets::sockaddrs& dest, const irc::sockets::sockaddrs& bind, unsigned long timeout)
  84 {
  85         if (fd < 0)
  86                 fd = socket(dest.sa.sa_family, SOCK_STREAM, 0);
  87
  88         if (fd < 0)
  89                 return I_ERR_SOCKET;
  90
  91         if (bind.sa.sa_family != 0)
  92         {
  93                 if (ServerInstance->SE->Bind(fd, bind) < 0)
  94                         return I_ERR_BIND;
  95         }
  96
  97         ServerInstance->SE->NonBlocking(fd);
  98
  99         if (ServerInstance->SE->Connect(this, &dest.sa, sa_size(dest)) == -1)
 100         {
 101                 if (errno != EINPROGRESS)
 102                         return I_ERR_CONNECT;
 103         }
 104
 105         this->state = I_CONNECTING;
 106
 107         if (!ServerInstance->SE->AddFd(this, FD_WANT_NO_READ | FD_WANT_SINGLE_WRITE | FD_WRITE_WILL_BLOCK))
 108                 return I_ERR_NOMOREFDS;
 109
 110         this->Timeout = new SocketTimeout(this->GetFd(), this, timeout, ServerInstance->Time());
 111         ServerInstance->Timers->AddTimer(this->Timeout);
 112
 113         IncreaseOSBuffers(fd);
 114
 115         ServerInstance->Logs->Log("SOCKET", DEBUG,"BufferedSocket::DoConnect success");
 116         return I_ERR_NONE;
 117 }
 118
 119 void StreamSocket::Close()
 120 {
 121         if (this->fd > -1)
 122         {
 123                 // final chance, dump as much of the sendq as we can
 124                 DoWrite();
 125                 if (IOHook)
 126                 {
 127                         try
 128                         {
 129                                 IOHook->OnStreamSocketClose(this);
 130                         }
 131                         catch (CoreException& modexcept)
 132                         {
 133                                 ServerInstance->Logs->Log("SOCKET", DEFAULT,"%s threw an exception: %s",
 134                                         modexcept.GetSource(), modexcept.GetReason());
 135                         }
 136                         IOHook = NULL;
 137                 }
 138                 ServerInstance->SE->Shutdown(this, 2);
 139                 ServerInstance->SE->DelFd(this);
 140                 ServerInstance->SE->Close(this);
 141                 fd = -1;
 142         }
 143 }
 144
 145 CullResult StreamSocket::cull()
 146 {
 147         Close();
 148         return EventHandler::cull();
 149 }
 150
 151 bool StreamSocket::GetNextLine(std::string& line, char delim)
 152 {
 153         std::string::size_type i = recvq.find(delim);
 154         if (i == std::string::npos)
 155                 return false;
 156         line = recvq.substr(0, i);
 157         // TODO is this the most efficient way to split?
 158         recvq = recvq.substr(i + 1);
 159         return true;
 160 }
 161
 162 void StreamSocket::DoRead()
 163 {
 164         if (IOHook)
 165         {
 166                 int rv = -1;
 167                 try
 168                 {
 169                         rv = IOHook->OnStreamSocketRead(this, recvq);
 170                 }
 171                 catch (CoreException& modexcept)
 172                 {
 173                         ServerInstance->Logs->Log("SOCKET", DEFAULT, "%s threw an exception: %s",
 174                                 modexcept.GetSource(), modexcept.GetReason());
 175                         return;
 176                 }
 177                 if (rv > 0)
 178                         OnDataReady();
 179                 if (rv < 0)
 180                         SetError("Read Error"); // will not overwrite a better error message
 181         }
 182         else
 183         {
 184                 char* ReadBuffer = ServerInstance->GetReadBuffer();
 185                 int n = recv(fd, ReadBuffer, ServerInstance->Config->NetBufferSize, 0);
 186                 if (n == ServerInstance->Config->NetBufferSize)
 187                 {
 188                         ServerInstance->SE->ChangeEventMask(this, FD_WANT_FAST_READ | FD_ADD_TRIAL_READ);
 189                         recvq.append(ReadBuffer, n);
 190                         OnDataReady();
 191                 }
 192                 else if (n > 0)
 193                 {
 194                         ServerInstance->SE->ChangeEventMask(this, FD_WANT_FAST_READ);
 195                         recvq.append(ReadBuffer, n);
 196                         OnDataReady();
 197                 }
 198                 else if (n == 0)
 199                 {
 200                         error = "Connection closed";
 201                         ServerInstance->SE->ChangeEventMask(this, FD_WANT_NO_READ | FD_WANT_NO_WRITE);
 202                 }
 203                 else if (errno == EAGAIN)
 204                 {
 205                         ServerInstance->SE->ChangeEventMask(this, FD_WANT_FAST_READ | FD_READ_WILL_BLOCK);
 206                 }
 207                 else if (errno == EINTR)
 208                 {
 209                         ServerInstance->SE->ChangeEventMask(this, FD_WANT_FAST_READ | FD_ADD_TRIAL_READ);
 210                 }
 211                 else
 212                 {
 213                         error = strerror(errno);
 214                         ServerInstance->SE->ChangeEventMask(this, FD_WANT_NO_READ | FD_WANT_NO_WRITE);
 215                 }
 216         }
 217 }
 218
 219 /* Don't try to prepare huge blobs of data to send to a blocked socket */
 220 static const int MYIOV_MAX = IOV_MAX < 128 ? IOV_MAX : 128;
 221
 222 void StreamSocket::DoWrite()
 223 {
 224         if (sendq.empty())
 225                 return;
 226         if (!error.empty() || fd < 0 || fd == INT_MAX)
 227         {
 228                 ServerInstance->Logs->Log("SOCKET", DEBUG, "DoWrite on errored or closed socket");
 229                 return;
 230         }
 231
 232 #ifndef DISABLE_WRITEV
 233         if (IOHook)
 234 #endif
 235         {
 236                 int rv = -1;
 237                 try
 238                 {
 239                         while (error.empty() && !sendq.empty())
 240                         {
 241                                 if (sendq.size() > 1 && sendq[0].length() < 1024)
 242                                 {
 243                                         // Avoid multiple repeated SSL encryption invocations
 244                                         // This adds a single copy of the queue, but avoids
 245                                         // much more overhead in terms of system calls invoked
 246                                         // by the IOHook.
 247                                         //
 248                                         // The length limit of 1024 is to prevent merging strings
 249                                         // more than once when writes begin to block.
 250                                         std::string tmp;
 251                                         tmp.reserve(sendq_len);
 252                                         for(unsigned int i=0; i < sendq.size(); i++)
 253                                                 tmp.append(sendq[i]);
 254                                         sendq.clear();
 255                                         sendq.push_back(tmp);
 256                                 }
 257                                 std::string& front = sendq.front();
 258                                 int itemlen = front.length();
 259                                 if (IOHook)
 260                                 {
 261                                         rv = IOHook->OnStreamSocketWrite(this, front);
 262                                         if (rv > 0)
 263                                         {
 264                                                 // consumed the entire string, and is ready for more
 265                                                 sendq_len -= itemlen;
 266                                                 sendq.pop_front();
 267                                         }
 268                                         else if (rv == 0)
 269                                         {
 270                                                 // socket has blocked. Stop trying to send data.
 271                                                 // IOHook has requested unblock notification from the socketengine
 272
 273                                                 // Since it is possible that a partial write took place, adjust sendq_len
 274                                                 sendq_len = sendq_len - itemlen + front.length();
 275                                                 return;
 276                                         }
 277                                         else
 278                                         {
 279                                                 SetError("Write Error"); // will not overwrite a better error message
 280                                                 return;
 281                                         }
 282                                 }
 283 #ifdef DISABLE_WRITEV
 284                                 else
 285                                 {
 286                                         rv = ServerInstance->SE->Send(this, front.data(), itemlen, 0);
 287                                         if (rv == 0)
 288                                         {
 289                                                 SetError("Connection closed");
 290                                                 return;
 291                                         }
 292                                         else if (rv < 0)
 293                                         {
 294                                                 if (errno == EAGAIN || errno == EINTR)
 295                                                         ServerInstance->SE->ChangeEventMask(this, FD_WANT_FAST_WRITE | FD_WRITE_WILL_BLOCK);
 296                                                 else
 297                                                         SetError(strerror(errno));
 298                                                 return;
 299                                         }
 300                                         else if (rv < itemlen)
 301                                         {
 302                                                 ServerInstance->SE->ChangeEventMask(this, FD_WANT_FAST_WRITE | FD_WRITE_WILL_BLOCK);
 303                                                 front = front.substr(itemlen - rv);
 304                                                 sendq_len -= rv;
 305                                                 return;
 306                                         }
 307                                         else
 308                                         {
 309                                                 sendq_len -= itemlen;
 310                                                 sendq.pop_front();
 311                                                 if (sendq.empty())
 312                                                         ServerInstance->SE->ChangeEventMask(this, FD_WANT_EDGE_WRITE);
 313                                         }
 314                                 }
 315 #endif
 316                         }
 317                 }
 318                 catch (CoreException& modexcept)
 319                 {
 320                         ServerInstance->Logs->Log("SOCKET", DEBUG,"%s threw an exception: %s",
 321                                 modexcept.GetSource(), modexcept.GetReason());
 322                 }
 323         }
 324 #ifndef DISABLE_WRITEV
 325         else
 326         {
 327                 // don't even try if we are known to be blocking
 328                 if (GetEventMask() & FD_WRITE_WILL_BLOCK)
 329                         return;
 330                 // start out optimistic - we won't need to write any more
 331                 int eventChange = FD_WANT_EDGE_WRITE;
 332                 while (error.empty() && sendq_len && eventChange == FD_WANT_EDGE_WRITE)
 333                 {
 334                         // Prepare a writev() call to write all buffers efficiently
 335                         int bufcount = sendq.size();
 336
 337                         // cap the number of buffers at MYIOV_MAX
 338                         if (bufcount > MYIOV_MAX)
 339                         {
 340                                 bufcount = MYIOV_MAX;
 341                         }
 342
 343                         int rv_max = 0;
 344                         iovec* iovecs = new iovec[bufcount];
 345                         for(int i=0; i < bufcount; i++)
 346                         {
 347                                 iovecs[i].iov_base = const_cast<char*>(sendq[i].data());
 348                                 iovecs[i].iov_len = sendq[i].length();
 349                                 rv_max += sendq[i].length();
 350                         }
 351                         int rv = writev(fd, iovecs, bufcount);
 352                         delete[] iovecs;
 353
 354                         if (rv == (int)sendq_len)
 355                         {
 356                                 // it's our lucky day, everything got written out. Fast cleanup.
 357                                 // This won't ever happen if the number of buffers got capped.
 358                                 sendq_len = 0;
 359                                 sendq.clear();
 360                         }
 361                         else if (rv > 0)
 362                         {
 363                                 // Partial write. Clean out strings from the sendq
 364                                 if (rv < rv_max)
 365                                 {
 366                                         // it's going to block now
 367                                         eventChange = FD_WANT_FAST_WRITE | FD_WRITE_WILL_BLOCK;
 368                                 }
 369                                 sendq_len -= rv;
 370                                 while (rv > 0 && !sendq.empty())
 371                                 {
 372                                         std::string& front = sendq.front();
 373                                         if (front.length() <= (size_t)rv)
 374                                         {
 375                                                 // this string got fully written out
 376                                                 rv -= front.length();
 377                                                 sendq.pop_front();
 378                                         }
 379                                         else
 380                                         {
 381                                                 // stopped in the middle of this string
 382                                                 front = front.substr(rv);
 383                                                 rv = 0;
 384                                         }
 385                                 }
 386                         }
 387                         else if (rv == 0)
 388                         {
 389                                 error = "Connection closed";
 390                         }
 391                         else if (errno == EAGAIN)
 392                         {
 393                                 eventChange = FD_WANT_FAST_WRITE | FD_WRITE_WILL_BLOCK;
 394                         }
 395                         else if (errno == EINTR)
 396                         {
 397                                 // restart interrupted syscall
 398                                 errno = 0;
 399                         }
 400                         else
 401                         {
 402                                 error = strerror(errno);
 403                         }
 404                 }
 405                 if (!error.empty())
 406                 {
 407                         // error - kill all events
 408                         ServerInstance->SE->ChangeEventMask(this, FD_WANT_NO_READ | FD_WANT_NO_WRITE);
 409                 }
 410                 else
 411                 {
 412                         ServerInstance->SE->ChangeEventMask(this, eventChange);
 413                 }
 414         }
 415 #endif
 416 }
 417
 418 void StreamSocket::WriteData(const std::string &data)
 419 {
 420         if (fd < 0)
 421         {
 422                 ServerInstance->Logs->Log("SOCKET", DEBUG, "Attempt to write data to dead socket: %s",
 423                         data.c_str());
 424                 return;
 425         }
 426
 427         /* Append the data to the back of the queue ready for writing */
 428         sendq.push_back(data);
 429         sendq_len += data.length();
 430
 431         ServerInstance->SE->ChangeEventMask(this, FD_ADD_TRIAL_WRITE);
 432 }
 433
 434 void SocketTimeout::Tick(time_t)
 435 {
 436         ServerInstance->Logs->Log("SOCKET", DEBUG,"SocketTimeout::Tick");
 437
 438         if (ServerInstance->SE->GetRef(this->sfd) != this->sock)
 439                 return;
 440
 441         if (this->sock->state == I_CONNECTING)
 442         {
 443                 // for connecting sockets, the timeout can occur
 444                 // which causes termination of the connection after
 445                 // the given number of seconds without a successful
 446                 // connection.
 447                 this->sock->OnTimeout();
 448                 this->sock->OnError(I_ERR_TIMEOUT);
 449                 this->sock->state = I_ERROR;
 450
 451                 ServerInstance->GlobalCulls.AddItem(sock);
 452         }
 453
 454         this->sock->Timeout = NULL;
 455 }
 456
 457 void BufferedSocket::OnConnected() { }
 458 void BufferedSocket::OnTimeout() { return; }
 459
 460 void BufferedSocket::DoWrite()
 461 {
 462         if (state == I_CONNECTING)
 463         {
 464                 state = I_CONNECTED;
 465                 this->OnConnected();
 466                 if (GetIOHook())
 467                         GetIOHook()->OnStreamSocketConnect(this);
 468                 else
 469                         ServerInstance->SE->ChangeEventMask(this, FD_WANT_FAST_READ | FD_WANT_EDGE_WRITE);
 470         }
 471         this->StreamSocket::DoWrite();
 472 }
 473
 474 BufferedSocket::~BufferedSocket()
 475 {
 476         this->Close();
 477         if (Timeout)
 478         {
 479                 ServerInstance->Timers->DelTimer(Timeout);
 480                 Timeout = NULL;
 481         }
 482 }
 483
 484 void StreamSocket::HandleEvent(EventType et, int errornum)
 485 {
 486         if (!error.empty())
 487                 return;
 488         BufferedSocketError errcode = I_ERR_OTHER;
 489         try {
 490                 switch (et)
 491                 {
 492                         case EVENT_ERROR:
 493                         {
 494                                 if (errornum == 0)
 495                                         SetError("Connection closed");
 496                                 else
 497                                         SetError(strerror(errornum));
 498                                 switch (errornum)
 499                                 {
 500                                         case ETIMEDOUT:
 501                                                 errcode = I_ERR_TIMEOUT;
 502                                                 break;
 503                                         case ECONNREFUSED:
 504                                         case 0:
 505                                                 errcode = I_ERR_CONNECT;
 506                                                 break;
 507                                         case EADDRINUSE:
 508                                                 errcode = I_ERR_BIND;
 509                                                 break;
 510                                         case EPIPE:
 511                                         case EIO:
 512                                                 errcode = I_ERR_WRITE;
 513                                                 break;
 514                                 }
 515                                 break;
 516                         }
 517                         case EVENT_READ:
 518                         {
 519                                 DoRead();
 520                                 break;
 521                         }
 522                         case EVENT_WRITE:
 523                         {
 524                                 DoWrite();
 525                                 break;
 526                         }
 527                 }
 528         }
 529         catch (CoreException& ex)
 530         {
 531                 ServerInstance->Logs->Log("SOCKET", DEFAULT, "Caught exception in socket processing on FD %d - '%s'",
 532                         fd, ex.GetReason());
 533                 SetError(ex.GetReason());
 534         }
 535         if (!error.empty())
 536         {
 537                 ServerInstance->Logs->Log("SOCKET", DEBUG, "Error on FD %d - '%s'", fd, error.c_str());
 538                 OnError(errcode);
 539         }
 540 }
 541