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 "socket.h"
  33 #include "inspircd.h"
  34 #include "inspircd_io.h"
  35 #include "inspstring.h"
  36 #include "helperfuncs.h"
  37 #include "socketengine.h"
  38
  39
  40 extern InspIRCd* ServerInstance;
  41 extern time_t TIME;
  42
  43 InspSocket* socket_ref[MAX_DESCRIPTORS];
  44
  45 InspSocket::InspSocket()
  46 {
  47         this->state = I_DISCONNECTED;
  48 }
  49
  50 InspSocket::InspSocket(int newfd, char* ip)
  51 {
  52         this->fd = newfd;
  53         this->state = I_CONNECTED;
  54         this->IP = ip;
  55         ServerInstance->SE->AddFd(this->fd,true,X_ESTAB_MODULE);
  56         socket_ref[this->fd] = this;
  57 }
  58
  59 InspSocket::InspSocket(std::string host, int port, bool listening, unsigned long maxtime)
  60 {
  61         if (listening) {
  62                 if ((this->fd = OpenTCPSocket()) == ERROR)
  63                 {
  64                         this->fd = -1;
  65                         this->state = I_ERROR;
  66                         this->OnError(I_ERR_SOCKET);
  67                         log(DEBUG,"OpenTCPSocket() error");
  68                         return;
  69                 }
  70                 else
  71                 {
  72                         if (BindSocket(this->fd,this->client,this->server,port,(char*)host.c_str()) == ERROR)
  73                         {
  74                                 this->Close();
  75                                 this->fd = -1;
  76                                 this->state = I_ERROR;
  77                                 this->OnError(I_ERR_BIND);
  78                                 log(DEBUG,"BindSocket() error %s",strerror(errno));
  79                                 return;
  80                         }
  81                         else
  82                         {
  83                                 this->state = I_LISTENING;
  84                                 ServerInstance->SE->AddFd(this->fd,true,X_ESTAB_MODULE);
  85                                 socket_ref[this->fd] = this;
  86                                 log(DEBUG,"New socket now in I_LISTENING state");
  87                                 return;
  88                         }
  89                 }
  90         } else {
  91                 this->host = host;
  92
  93                 if (this->dns.ForwardLookupWithFD(host,fd))
  94                 {
  95                         timeout_end = time(NULL)+maxtime;
  96                         timeout = false;
  97                         this->state = I_RESOLVING;
  98                 }
  99                 else
 100                 {
 101                         this->state = I_ERROR;
 102                         this->OnError(I_ERR_RESOLVE);
 103                         return;
 104                 }
 105 }
 106
 107 bool InspSocket::DoResolve()
 108 {
 109         if (this->dns.HasResult())
 110         {
 111                 std::string res_ip = dns.GetResultIP();
 112
 113                 if (res_ip != "")
 114                 {
 115                         this->IP = ip;
 116                 }
 117                 else
 118                 {
 119                         this->IP = this->host;
 120                 }
 121
 122                 if ((this->fd = socket(AF_INET, SOCK_STREAM, 0)) == -1)
 123                 {
 124                         this->state = I_ERROR;
 125                         this->OnError(I_ERR_SOCKET);
 126                         return false;
 127                 }
 128                 this->port = port;
 129                 inet_aton(ip,&addy);
 130                 addr.sin_family = AF_INET;
 131                 addr.sin_addr = addy;
 132                 addr.sin_port = htons(this->port);
 133
 134                 int flags;
 135                 flags = fcntl(this->fd, F_GETFL, 0);
 136                 fcntl(this->fd, F_SETFL, flags | O_NONBLOCK);
 137
 138                 if(connect(this->fd, (sockaddr*)&this->addr,sizeof(this->addr)) == -1)
 139                 {
 140                         if (errno != EINPROGRESS)
 141                         {
 142                                 this->Close();
 143                                 this->OnError(I_ERR_CONNECT);
 144                                 this->state = I_ERROR;
 145                                 return false;
 146                         }
 147                 }
 148                 this->state = I_CONNECTING;
 149                 ServerInstance->SE->AddFd(this->fd,false,X_ESTAB_MODULE);
 150                 socket_ref[this->fd] = this;
 151                 return true;
 152         }
 153 }
 154
 155 void InspSocket::Close()
 156 {
 157         if (this->fd != -1)
 158         {
 159                 this->OnClose();
 160                 shutdown(this->fd,2);
 161                 close(this->fd);
 162                 socket_ref[this->fd] = NULL;
 163                 this->fd = -1;
 164         }
 165 }
 166
 167 std::string InspSocket::GetIP()
 168 {
 169         return this->IP;
 170 }
 171
 172 char* InspSocket::Read()
 173 {
 174         int n = recv(this->fd,this->ibuf,sizeof(this->ibuf),0);
 175         if (n > 0)
 176         {
 177                 ibuf[n] = 0;
 178                 return ibuf;
 179         }
 180         else
 181         {
 182                 if (n == EAGAIN)
 183                 {
 184                         return "";
 185                 }
 186                 else
 187                 {
 188                         log(DEBUG,"EOF or error on socket");
 189                         return NULL;
 190                 }
 191         }
 192 }
 193
 194 // There are two possible outcomes to this function.
 195 // It will either write all of the data, or an undefined amount.
 196 // If an undefined amount is written the connection has failed
 197 // and should be aborted.
 198 int InspSocket::Write(std::string data)
 199 {
 200         this->Buffer = this->Buffer + data;
 201         this->FlushWriteBuffer();
 202         return data.length();
 203 }
 204
 205 void InspSocket::FlushWriteBuffer()
 206 {
 207         int result = 0;
 208         if (this->Buffer.length())
 209         {
 210                 result = send(this->fd,this->Buffer.c_str(),this->Buffer.length(),0);
 211                 if (result > 0)
 212                 {
 213                         /* If we wrote some, advance the buffer forwards */
 214                         char* n = (char*)this->Buffer.c_str();
 215                         n += result;
 216                         this->Buffer = n;
 217                 }
 218         }
 219 }
 220
 221 bool InspSocket::Timeout(time_t current)
 222 {
 223         if (((this->state == I_RESOLVING) || (this->state == I_CONNECTING)) && (current > timeout_end))
 224         {
 225                 // for non-listening sockets, the timeout can occur
 226                 // which causes termination of the connection after
 227                 // the given number of seconds without a successful
 228                 // connection.
 229                 this->OnTimeout();
 230                 this->OnError(I_ERR_TIMEOUT);
 231                 timeout = true;
 232                 this->state = I_ERROR;
 233                 return true;
 234         }
 235         if (this->Buffer.length())
 236                 this->FlushWriteBuffer();
 237         return false;
 238 }
 239
 240 bool InspSocket::Poll()
 241 {
 242         int incoming = -1;
 243
 244         switch (this->state)
 245         {
 246                 case I_RESOLVING:
 247                         return this->DoResolve();
 248                 break;
 249                 case I_CONNECTING:
 250                         this->SetState(I_CONNECTED);
 251                         /* Our socket was in write-state, so delete it and re-add it
 252                          * in read-state.
 253                          */
 254                         ServerInstance->SE->DelFd(this->fd);
 255                         ServerInstance->SE->AddFd(this->fd,true,X_ESTAB_MODULE);
 256                         return this->OnConnected();
 257                 break;
 258                 case I_LISTENING:
 259                         length = sizeof (client);
 260                         incoming = accept (this->fd, (sockaddr*)&client,&length);
 261                         this->OnIncomingConnection(incoming,inet_ntoa(client.sin_addr));
 262                         return true;
 263                 break;
 264                 case I_CONNECTED:
 265                         return this->OnDataReady();
 266                 break;
 267                 default:
 268                 break;
 269         }
 270
 271         if (this->Buffer.length())
 272                 this->FlushWriteBuffer();
 273
 274         return true;
 275 }
 276
 277 void InspSocket::SetState(InspSocketState s)
 278 {
 279         log(DEBUG,"Socket state change");
 280         this->state = s;
 281 }
 282
 283 InspSocketState InspSocket::GetState()
 284 {
 285         return this->state;
 286 }
 287
 288 int InspSocket::GetFd()
 289 {
 290         return this->fd;
 291 }
 292
 293 bool InspSocket::OnConnected() { return true; }
 294 void InspSocket::OnError(InspSocketError e) { return; }
 295 int InspSocket::OnDisconnect() { return 0; }
 296 int InspSocket::OnIncomingConnection(int newfd, char* ip) { return 0; }
 297 bool InspSocket::OnDataReady() { return true; }
 298 void InspSocket::OnTimeout() { return; }
 299 void InspSocket::OnClose() { return; }
 300
 301 InspSocket::~InspSocket()
 302 {
 303         this->Close();
 304 }
 305