src/socket.cpp

   1 /*       +------------------------------------+
   2  *       | Inspire Internet Relay Chat Daemon |
   3  *       +------------------------------------+
   4  *
   5  *  InspIRCd is copyright (C) 2002-2006 ChatSpike-Dev.
   6  *                       E-mail:
   7  *                <brain@chatspike.net>
   8  *                <Craig@chatspike.net>
   9  *
  10  * Written by Craig Edwards, Craig McLure, and others.
  11  * This program is free but copyrighted software; see
  12  *            the file COPYING for details.
  13  *
  14  * ---------------------------------------------------
  15  */
  16
  17 using namespace std;
  18
  19 #include "inspircd_config.h"
  20 #include <sys/time.h>
  21 #include <sys/resource.h>
  22 #include <sys/types.h>
  23 #include <sys/socket.h>
  24 #include <netinet/in.h>
  25 #include <string>
  26 #include <unistd.h>
  27 #include <fcntl.h>
  28 #include <poll.h>
  29 #include <sstream>
  30 #include <iostream>
  31 #include <fstream>
  32 #include <stdexcept>
  33 #include "socket.h"
  34 #include "inspircd.h"
  35 #include "inspircd_io.h"
  36 #include "inspstring.h"
  37 #include "helperfuncs.h"
  38 #include "socketengine.h"
  39
  40
  41 extern InspIRCd* ServerInstance;
  42 extern ServerConfig* Config;
  43 extern time_t TIME;
  44
  45 InspSocket* socket_ref[MAX_DESCRIPTORS];
  46
  47 InspSocket::InspSocket()
  48 {
  49         this->state = I_DISCONNECTED;
  50         this->fd = -1;
  51         this->ClosePending = false;
  52 }
  53
  54 InspSocket::InspSocket(int newfd, char* ip)
  55 {
  56         this->fd = newfd;
  57         this->state = I_CONNECTED;
  58         this->IP = ip;
  59         this->ClosePending = false;
  60         ServerInstance->SE->AddFd(this->fd,true,X_ESTAB_MODULE);
  61         socket_ref[this->fd] = this;
  62 }
  63
  64 InspSocket::InspSocket(const std::string &ahost, int aport, bool listening, unsigned long maxtime) : fd(-1), host(ahost)
  65 {
  66         this->ClosePending = false;
  67         this->outbuffer.clear();
  68         if (listening) {
  69                 if ((this->fd = OpenTCPSocket()) == ERROR)
  70                 {
  71                         this->fd = -1;
  72                         this->state = I_ERROR;
  73                         this->OnError(I_ERR_SOCKET);
  74                         log(DEBUG,"OpenTCPSocket() error");
  75                         return;
  76                 }
  77                 else
  78                 {
  79                         if (BindSocket(this->fd,this->client,this->server,aport,(char*)ahost.c_str()) == ERROR)
  80                         {
  81                                 this->Close();
  82                                 this->fd = -1;
  83                                 this->state = I_ERROR;
  84                                 this->OnError(I_ERR_BIND);
  85                                 log(DEBUG,"BindSocket() error %s",strerror(errno));
  86                                 return;
  87                         }
  88                         else
  89                         {
  90                                 this->state = I_LISTENING;
  91                                 ServerInstance->SE->AddFd(this->fd,true,X_ESTAB_MODULE);
  92                                 socket_ref[this->fd] = this;
  93                                 log(DEBUG,"New socket now in I_LISTENING state");
  94                                 return;
  95                         }
  96                 }
  97         }
  98         else
  99         {
 100                 this->host = ahost;
 101                 this->port = aport;
 102
 103                 if (!inet_aton(host.c_str(),&addy))
 104                 {
 105                         log(DEBUG,"Attempting to resolve %s",this->host.c_str());
 106                         /* Its not an ip, spawn the resolver */
 107                         this->dns.SetNS(std::string(Config->DNSServer));
 108                         this->dns.ForwardLookupWithFD(host,fd);
 109                         timeout_end = time(NULL) + maxtime;
 110                         timeout = false;
 111                         this->state = I_RESOLVING;
 112                         socket_ref[this->fd] = this;
 113                 }
 114                 else
 115                 {
 116                         log(DEBUG,"No need to resolve %s",this->host.c_str());
 117                         this->IP = host;
 118                         timeout_end = time(NULL) + maxtime;
 119                         this->DoConnect();
 120                 }
 121         }
 122 }
 123
 124 void InspSocket::SetQueues(int nfd)
 125 {
 126         // attempt to increase socket sendq and recvq as high as its possible
 127         int sendbuf = 32768;
 128         int recvbuf = 32768;
 129         setsockopt(nfd,SOL_SOCKET,SO_SNDBUF,(const void *)&sendbuf,sizeof(sendbuf));
 130         setsockopt(nfd,SOL_SOCKET,SO_RCVBUF,(const void *)&recvbuf,sizeof(sendbuf));
 131 }
 132
 133 bool InspSocket::DoResolve()
 134 {
 135         log(DEBUG,"In DoResolve(), trying to resolve IP");
 136         if (this->dns.HasResult())
 137         {
 138                 log(DEBUG,"Socket has result");
 139                 std::string res_ip = dns.GetResultIP();
 140                 if (res_ip != "")
 141                 {
 142                         log(DEBUG,"Socket result set to %s",res_ip.c_str());
 143                         this->IP = res_ip;
 144                         socket_ref[this->fd] = NULL;
 145                 }
 146                 else
 147                 {
 148                         log(DEBUG,"Socket DNS failure");
 149                         this->Close();
 150                         this->state = I_ERROR;
 151                         this->OnError(I_ERR_RESOLVE);
 152                         this->fd = -1;
 153                         return false;
 154                 }
 155                 return this->DoConnect();
 156         }
 157         log(DEBUG,"No result for socket yet!");
 158         return true;
 159 }
 160
 161 bool InspSocket::DoConnect()
 162 {
 163         log(DEBUG,"In DoConnect()");
 164         if ((this->fd = socket(AF_INET, SOCK_STREAM, 0)) == -1)
 165         {
 166                 log(DEBUG,"Cant socket()");
 167                 this->state = I_ERROR;
 168                 this->OnError(I_ERR_SOCKET);
 169                 this->fd = -1;
 170                 return false;
 171         }
 172
 173         log(DEBUG,"Part 2 DoConnect() %s",this->IP.c_str());
 174         inet_aton(this->IP.c_str(),&addy);
 175         addr.sin_family = AF_INET;
 176         addr.sin_addr = addy;
 177         addr.sin_port = htons(this->port);
 178
 179         int flags;
 180         flags = fcntl(this->fd, F_GETFL, 0);
 181         fcntl(this->fd, F_SETFL, flags | O_NONBLOCK);
 182
 183         if (connect(this->fd, (sockaddr*)&this->addr,sizeof(this->addr)) == -1)
 184         {
 185                 if (errno != EINPROGRESS)
 186                 {
 187                         log(DEBUG,"Error connect() %d: %s",this->fd,strerror(errno));
 188                         this->OnError(I_ERR_CONNECT);
 189                         this->state = I_ERROR;
 190                         this->Close();
 191                         this->fd = -1;
 192                         return false;
 193                 }
 194         }
 195         this->state = I_CONNECTING;
 196         ServerInstance->SE->AddFd(this->fd,false,X_ESTAB_MODULE);
 197         socket_ref[this->fd] = this;
 198         this->SetQueues(this->fd);
 199         log(DEBUG,"Returning true from InspSocket::DoConnect");
 200         return true;
 201 }
 202
 203
 204 void InspSocket::Close()
 205 {
 206         if (this->fd != -1)
 207         {
 208                 this->OnClose();
 209                 shutdown(this->fd,2);
 210                 close(this->fd);
 211                 socket_ref[this->fd] = NULL;
 212                 this->fd = -1;
 213         }
 214 }
 215
 216 std::string InspSocket::GetIP()
 217 {
 218         return this->IP;
 219 }
 220
 221 char* InspSocket::Read()
 222 {
 223         if ((fd < 0) || (fd > MAX_DESCRIPTORS))
 224                 return NULL;
 225         int n = recv(this->fd,this->ibuf,sizeof(this->ibuf),0);
 226         if ((n > 0) && (n <= (int)sizeof(this->ibuf)))
 227         {
 228                 ibuf[n] = 0;
 229                 return ibuf;
 230         }
 231         else
 232         {
 233                 if (errno == EAGAIN)
 234                 {
 235                         return "";
 236                 }
 237                 else
 238                 {
 239                         log(DEBUG,"EOF or error on socket: %s",strerror(errno));
 240                         return NULL;
 241                 }
 242         }
 243 }
 244
 245 void InspSocket::MarkAsClosed()
 246 {
 247         log(DEBUG,"Marked as closed");
 248         this->ClosePending = true;
 249 }
 250
 251 // There are two possible outcomes to this function.
 252 // It will either write all of the data, or an undefined amount.
 253 // If an undefined amount is written the connection has failed
 254 // and should be aborted.
 255 int InspSocket::Write(const std::string &data)
 256 {
 257         if (this->ClosePending)
 258                 return false;
 259         /* Try and append the data to the back of the queue, and send it on its way
 260          */
 261         outbuffer.push_back(data);
 262         return (!this->FlushWriteBuffer());
 263 }
 264
 265 bool InspSocket::FlushWriteBuffer()
 266 {
 267         if (this->ClosePending)
 268                 return true;
 269
 270         if ((this->fd > -1) && (this->state == I_CONNECTED))
 271         {
 272                 if (outbuffer.size())
 273                 {
 274                         int result = write(this->fd,outbuffer[0].c_str(),outbuffer[0].length());
 275                         if (result > 0)
 276                         {
 277                                 if ((unsigned int)result == outbuffer[0].length())
 278                                 {
 279                                         /* The whole block was written (usually a line)
 280                                          * Pop the block off the front of the queue
 281                                          */
 282                                         outbuffer.pop_front();
 283                                 }
 284                                 else
 285                                 {
 286                                         std::string temp = outbuffer[0].substr(result);
 287                                         outbuffer[0] = temp;
 288                                 }
 289                         }
 290                         else if ((result == -1) && (errno != EAGAIN))
 291                         {
 292                                 log(DEBUG,"Write error on socket: %s",strerror(errno));
 293                                 this->OnError(I_ERR_WRITE);
 294                                 this->state = I_ERROR;
 295                                 return true;
 296                         }
 297                 }
 298         }
 299         return false;
 300 }
 301
 302 bool InspSocket::Timeout(time_t current)
 303 {
 304         if (!socket_ref[this->fd] || !ServerInstance->SE->HasFd(this->fd))
 305         {
 306                 log(DEBUG,"No FD or socket ref");
 307                 return false;
 308         }
 309
 310         if (this->ClosePending)
 311         {
 312                 log(DEBUG,"Close is pending");
 313                 return true;
 314         }
 315
 316         if (((this->state == I_RESOLVING) || (this->state == I_CONNECTING)) && (current > timeout_end))
 317         {
 318                 log(DEBUG,"Timed out, current=%lu timeout_end=%lu");
 319                 // for non-listening sockets, the timeout can occur
 320                 // which causes termination of the connection after
 321                 // the given number of seconds without a successful
 322                 // connection.
 323                 this->OnTimeout();
 324                 this->OnError(I_ERR_TIMEOUT);
 325                 timeout = true;
 326                 this->state = I_ERROR;
 327                 return true;
 328         }
 329         return this->FlushWriteBuffer();
 330 }
 331
 332 bool InspSocket::Poll()
 333 {
 334         if (!socket_ref[this->fd] || !ServerInstance->SE->HasFd(this->fd))
 335                 return false;
 336
 337         int incoming = -1;
 338         bool n = true;
 339
 340         if ((fd < 0) || (fd > MAX_DESCRIPTORS) || (this->ClosePending))
 341                 return false;
 342
 343         switch (this->state)
 344         {
 345                 case I_RESOLVING:
 346                         log(DEBUG,"State = I_RESOLVING, calling DoResolve()");
 347                         return this->DoResolve();
 348                 break;
 349                 case I_CONNECTING:
 350                         log(DEBUG,"State = I_CONNECTING");
 351                         this->SetState(I_CONNECTED);
 352                         /* Our socket was in write-state, so delete it and re-add it
 353                          * in read-state.
 354                          */
 355                         ServerInstance->SE->DelFd(this->fd);
 356                         ServerInstance->SE->AddFd(this->fd,true,X_ESTAB_MODULE);
 357                         return this->OnConnected();
 358                 break;
 359                 case I_LISTENING:
 360                         length = sizeof (client);
 361                         incoming = accept (this->fd, (sockaddr*)&client,&length);
 362                         this->SetQueues(incoming);
 363                         this->OnIncomingConnection(incoming,inet_ntoa(client.sin_addr));
 364                         return true;
 365                 break;
 366                 case I_CONNECTED:
 367                         n = this->OnDataReady();
 368                         /* Flush any pending, but not till after theyre done with the event
 369                          * so there are less write calls involved.
 370                          * Both FlushWriteBuffer AND the return result of OnDataReady must
 371                          * return true for this to be ok.
 372                          */
 373                         return (n && !this->FlushWriteBuffer());
 374                 break;
 375                 default:
 376                 break;
 377         }
 378         return true;
 379 }
 380
 381 void InspSocket::SetState(InspSocketState s)
 382 {
 383         log(DEBUG,"Socket state change");
 384         this->state = s;
 385 }
 386
 387 InspSocketState InspSocket::GetState()
 388 {
 389         return this->state;
 390 }
 391
 392 int InspSocket::GetFd()
 393 {
 394         return this->fd;
 395 }
 396
 397 bool InspSocket::OnConnected() { return true; }
 398 void InspSocket::OnError(InspSocketError e) { return; }
 399 int InspSocket::OnDisconnect() { return 0; }
 400 int InspSocket::OnIncomingConnection(int newfd, char* ip) { return 0; }
 401 bool InspSocket::OnDataReady() { return true; }
 402 void InspSocket::OnTimeout() { return; }
 403 void InspSocket::OnClose() { return; }
 404
 405 InspSocket::~InspSocket()
 406 {
 407         this->Close();
 408 }