Socket.cpp
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/** @file
* \brief Fichero de implementación de la clase Socket
* \author Imanol Barba Sabariego
* \date 13/06/2013
*
* En este fichero se implementan los métodos de la clase Socket definidos en Socket.h
*/
#include "Socket.h"
#include "SocketException.h"
#include <sstream>
#include <strings.h>
#include <cstdlib>
#include <netinet/tcp.h>
using namespace std;
Socket::Socket()
{
sock = -1;
}
int Socket::getSock()
{
return sock;
}
void Socket::Create()
{
int optval = 1;
if((sock = socket(AF_INET, SOCK_STREAM, 0)) <= 0)
{
throw SocketException ( "TCP: Could not create socket" );
}
setsockopt(sock,SOL_SOCKET,SO_KEEPALIVE,&optval,sizeof optval);
setsockopt(sock, SOL_TCP, TCP_NODELAY, &optval, sizeof optval);
}
void Socket::Bind(string address, int port)
{
sockAddr.sin_family = AF_INET;
sockAddr.sin_port = htons(port);
sockAddr.sin_addr.s_addr = inet_addr(address.c_str());
if(bind(sock, (struct sockaddr *)&sockAddr, sizeof(struct sockaddr)) != 0)
{
stringstream sstream;
sstream << "TCP: Could not bind to address " << address << " on port " << port;
throw SocketException ( sstream.str() );
}
}
void Socket::Listen(int backlog)
{
if(listen(sock, backlog) != 0)
{
throw SocketException ( "TCP: Could not listen to socket" );
}
}
void Socket::Accept(Socket &clientSock)
{
int size = sizeof(struct sockaddr);
clientSock.sock = accept(sock,(struct sockaddr *)&clientSock.sockAddr, (socklen_t *)&size);
if(clientSock.sock == -1)
{
throw SocketException ( "TCP: Could not accept incoming connection" );
}
}
void Socket::Connect(string hostname, int port)
{
struct in_addr *addr_ptr;
struct hostent *hostPtr;
string add;
hostPtr = gethostbyname(hostname.c_str());
if(hostPtr == NULL)
{
throw SocketException (string("Could not resolve hostname ").append(hostname));
}
addr_ptr = (struct in_addr *)*hostPtr->h_addr_list;
add = inet_ntoa(*addr_ptr);
if(add == "")
{
throw SocketException ( "Invalid address" );
}
struct sockaddr_in newSockAddr;
newSockAddr.sin_family = AF_INET;
newSockAddr.sin_port = htons(port);
newSockAddr.sin_addr.s_addr = inet_addr(add.c_str());
if(connect(sock, (struct sockaddr *)&newSockAddr, sizeof(struct sockaddr)) != 0)
{
stringstream sstream;
sstream << "Could not connect to " << hostname << " on port " << port;
throw SocketException ( sstream.str());
}
}
int Socket::Receive(char *buff, int length)
{
int bytes, total = 0;
while(total != length)
{
bytes = recv(sock, buff+total, length-total,0);
if ( bytes <= 0 )
{
throw SocketException ( "TCP: Could not read from socket." );
}
total += bytes;
}
return total;
}
int Socket::Send(const char *buff, int length)
{
int bytes, total = 0;
while(total != length)
{
bytes = send(sock,buff+total,length-total,0);
if(bytes == -1)
{
throw SocketException ( "TCP: Could not write to socket." );
}
total += bytes;
}
return total;
}
void Socket::Close()
{
if(sock > 0)
{
close(sock);
sock = 0;
}
else
{
throw SocketException ( "TCP: Could not close socket." );
}
}
const Socket& Socket::operator << ( const std::string& text)
{
stringstream sstream;
int length = text.length();
if(!length)
{
string s = "0";
Send(s.c_str(), 2);
return *this;
}
sstream << length;
string len = sstream.str();
Send(len.c_str(), len.length()+1);
Send(text.c_str(), text.length());
return *this;
}
const Socket& Socket::operator >> ( std::string& text )
{
text = "";
string len;
int length;
stringstream sstream;
char c;
while(true)
{
if( Receive(&c,1) <= 0)
{
throw SocketException ( "TCP: Could not read from socket." );
}
if(c == '\0')
{
break;
}
len += c;
}
sstream << len;
sstream >> length;
if(!length)
{
return *this;
}
char *message = new char[length];
Receive(message,length);
text.append(message,length);
if(message != NULL)
{
delete[] message;
message = NULL;
}
return *this;
}