src/socket.cpp

   1 /*       +------------------------------------+
   2  *       | Inspire Internet Relay Chat Daemon |
   3  *       +------------------------------------+
   4  *
   5  *  Inspire is copyright (C) 2002-2004 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 "inspircd_util.h"
  36 #include "inspstring.h"
  37 #include "helperfuncs.h"
  38 #include "socketengine.h"
  39
  40 extern SocketEngine* SE;
  41
  42 extern FILE *log_file;
  43 extern int boundPortCount;
  44 extern int openSockfd[MAXSOCKS];
  45 extern time_t TIME;
  46 extern bool unlimitcore;
  47 extern int MaxConn;
  48
  49 InspSocket::InspSocket()
  50 {
  51         this->state = I_DISCONNECTED;
  52 }
  53
  54 InspSocket::InspSocket(int newfd, char* ip)
  55 {
  56         this->fd = newfd;
  57         this->state = I_CONNECTED;
  58         this->IP = ip;
  59         SE->AddFd(this->fd,true,X_ESTAB_MODULE);
  60 }
  61
  62 InspSocket::InspSocket(std::string host, int port, bool listening, unsigned long maxtime)
  63 {
  64         if (listening) {
  65                 if ((this->fd = OpenTCPSocket()) == ERROR)
  66                 {
  67                         this->fd = -1;
  68                         this->state = I_ERROR;
  69                         this->OnError(I_ERR_SOCKET);
  70                         log(DEBUG,"OpenTCPSocket() error");
  71                         return;
  72                 }
  73                 else
  74                 {
  75                         if (BindSocket(this->fd,this->client,this->server,port,(char*)host.c_str()) == ERROR)
  76                         {
  77                                 this->Close();
  78                                 this->fd = -1;
  79                                 this->state = I_ERROR;
  80                                 this->OnError(I_ERR_BIND);
  81                                 log(DEBUG,"BindSocket() error %s",strerror(errno));
  82                                 return;
  83                         }
  84                         else
  85                         {
  86                                 this->state = I_LISTENING;
  87                                 SE->AddFd(this->fd,true,X_ESTAB_MODULE);
  88                                 log(DEBUG,"New socket now in I_LISTENING state");
  89                                 return;
  90                         }
  91                 }
  92         } else {
  93                 char* ip;
  94                 this->host = host;
  95                 hostent* hoste = gethostbyname(host.c_str());
  96                 if (!hoste) {
  97                         ip = (char*)host.c_str();
  98                 } else {
  99                         struct in_addr* ia = (in_addr*)hoste->h_addr;
 100                         ip = inet_ntoa(*ia);
 101                 }
 102
 103                 this->IP = ip;
 104
 105                 timeout_end = time(NULL)+maxtime;
 106                 timeout = false;
 107                 if ((this->fd = socket(AF_INET, SOCK_STREAM, 0)) == -1)
 108                 {
 109                         this->state = I_ERROR;
 110                         this->OnError(I_ERR_SOCKET);
 111                         return;
 112                 }
 113                 this->port = port;
 114                 inet_aton(ip,&addy);
 115                 addr.sin_family = AF_INET;
 116                 addr.sin_addr = addy;
 117                 addr.sin_port = htons(this->port);
 118
 119                 int flags;
 120                 flags = fcntl(this->fd, F_GETFL, 0);
 121                 fcntl(this->fd, F_SETFL, flags | O_NONBLOCK);
 122
 123                 if(connect(this->fd, (sockaddr*)&this->addr,sizeof(this->addr)) == -1)
 124                 {
 125                         if (errno != EINPROGRESS)
 126                         {
 127                                 this->Close();
 128                                 this->OnError(I_ERR_CONNECT);
 129                                 this->state = I_ERROR;
 130                                 return;
 131                         }
 132                 }
 133                 this->state = I_CONNECTING;
 134                 SE->AddFd(this->fd,false,X_ESTAB_MODULE);
 135                 return;
 136         }
 137 }
 138
 139 void InspSocket::Close()
 140 {
 141         if (this->fd != -1)
 142         {
 143                 this->OnClose();
 144                 shutdown(this->fd,2);
 145                 close(this->fd);
 146                 this->fd = -1;
 147         }
 148 }
 149
 150 std::string InspSocket::GetIP()
 151 {
 152         return this->IP;
 153 }
 154
 155 char* InspSocket::Read()
 156 {
 157         int n = recv(this->fd,this->ibuf,sizeof(this->ibuf),0);
 158         if (n > 0)
 159         {
 160                 ibuf[n] = 0;
 161                 return ibuf;
 162         }
 163         else
 164         {
 165                 log(DEBUG,"EOF or error on socket");
 166                 return NULL;
 167         }
 168 }
 169
 170 // There are two possible outcomes to this function.
 171 // It will either write all of the data, or an undefined amount.
 172 // If an undefined amount is written the connection has failed
 173 // and should be aborted.
 174 int InspSocket::Write(std::string data)
 175 {
 176         char* d = (char*)data.c_str();
 177         unsigned int written = 0;
 178         int n = 0;
 179         int s = data.length();
 180         while ((written < data.length()) && (n >= 0))
 181         {
 182                 n = send(this->fd,d,s,0);
 183                 if (n > 0)
 184                 {
 185                         // If we didnt write everything, advance
 186                         // the pointers so that when we retry
 187                         // the next time around the loop, we try
 188                         // to write what we failed to write before.
 189                         written += n;
 190                         s -= n;
 191                         d += n;
 192                 }
 193         }
 194         return written;
 195 }
 196
 197 bool InspSocket::Poll()
 198 {
 199         if ((time(NULL) > timeout_end) && (this->state == I_CONNECTING))
 200         {
 201                 // for non-listening sockets, the timeout can occur
 202                 // which causes termination of the connection after
 203                 // the given number of seconds without a successful
 204                 // connection.
 205                 this->OnTimeout();
 206                 this->OnError(I_ERR_TIMEOUT);
 207                 timeout = true;
 208                 this->state = I_ERROR;
 209                 return false;
 210         }
 211
 212         int incoming = -1;
 213
 214         switch (this->state)
 215         {
 216                 case I_CONNECTING:
 217                         this->SetState(I_CONNECTED);
 218                         return this->OnConnected();
 219                         /* Our socket was in write-state, so delete it and re-add it
 220                          * in read-state.
 221                          */
 222                         SE->DelFd(this->fd);
 223                         SE->AddFd(this->fd,true,X_ESTAB_MODULE);
 224                 break;
 225                 case I_LISTENING:
 226                         length = sizeof (client);
 227                         incoming = accept (this->fd, (sockaddr*)&client,&length);
 228                         this->OnIncomingConnection(incoming,inet_ntoa(client.sin_addr));
 229                         return true;
 230                 break;
 231                 case I_CONNECTED:
 232                         return this->OnDataReady();
 233                 break;
 234                 default:
 235                 break;
 236         }
 237
 238         return true;
 239 }
 240
 241 void InspSocket::SetState(InspSocketState s)
 242 {
 243         log(DEBUG,"Socket state change");
 244         this->state = s;
 245 }
 246
 247 InspSocketState InspSocket::GetState()
 248 {
 249         return this->state;
 250 }
 251
 252 int InspSocket::GetFd()
 253 {
 254         return this->fd;
 255 }
 256
 257 bool InspSocket::OnConnected() { return true; }
 258 void InspSocket::OnError(InspSocketError e) { return; }
 259 int InspSocket::OnDisconnect() { return 0; }
 260 int InspSocket::OnIncomingConnection(int newfd, char* ip) { return 0; }
 261 bool InspSocket::OnDataReady() { return true; }
 262 void InspSocket::OnTimeout() { return; }
 263 void InspSocket::OnClose() { return; }
 264
 265 InspSocket::~InspSocket()
 266 {
 267         this->Close();
 268 }
 269
 270 /*
 271 int BindSocket (int sockfd, struct sockaddr_in client, struct sockaddr_in server, int port, char* addr)
 272 int OpenTCPSocket (void)
 273 */