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/*
* Unix Socket
* (C) 2004-2010 Jack Lloyd
*
* Released under the terms of the Botan license
*/
#ifndef SOCKET_WRAPPER_H__
#define SOCKET_WRAPPER_H__
#include <stdexcept>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/time.h>
#include <netinet/in.h>
#include <netdb.h>
#include <unistd.h>
#include <errno.h>
#include <string.h>
class Socket
{
public:
size_t read(unsigned char[], size_t);
void write(const unsigned char[], size_t);
std::string peer_id() const { return peer; }
void close()
{
if(sockfd != -1)
{
if(::close(sockfd) != 0)
throw std::runtime_error("Socket::close failed");
sockfd = -1;
}
}
Socket(int fd, const std::string& peer_id = "") :
peer(peer_id), sockfd(fd)
{
}
Socket(const std::string&, unsigned short);
~Socket() { close(); }
private:
std::string peer;
int sockfd;
};
class Server_Socket
{
public:
/**
* Accept a new connection
*/
Socket* accept()
{
int retval = ::accept(sockfd, 0, 0);
if(retval == -1)
throw std::runtime_error("Server_Socket: accept failed");
return new Socket(retval);
}
void close()
{
if(sockfd != -1)
{
if(::close(sockfd) != 0)
throw std::runtime_error("Server_Socket::close failed");
sockfd = -1;
}
}
Server_Socket(unsigned short);
~Server_Socket() { close(); }
private:
int sockfd;
};
/**
* Unix Socket Constructor
*/
Socket::Socket(const std::string& host, unsigned short port) : peer(host)
{
sockfd = -1;
hostent* host_addr = ::gethostbyname(host.c_str());
if(host_addr == 0)
throw std::runtime_error("Socket: gethostbyname failed for " + host);
if(host_addr->h_addrtype != AF_INET) // FIXME
throw std::runtime_error("Socket: " + host + " has IPv6 address");
int fd = ::socket(PF_INET, SOCK_STREAM, 0);
if(fd == -1)
throw std::runtime_error("Socket: Unable to acquire socket");
sockaddr_in socket_info;
::memset(&socket_info, 0, sizeof(socket_info));
socket_info.sin_family = AF_INET;
socket_info.sin_port = htons(port);
::memcpy(&socket_info.sin_addr,
host_addr->h_addr,
host_addr->h_length);
socket_info.sin_addr = *(struct in_addr*)host_addr->h_addr; // FIXME
if(::connect(fd, (sockaddr*)&socket_info, sizeof(struct sockaddr)) != 0)
{
::close(fd);
throw std::runtime_error("Socket: connect failed");
}
sockfd = fd;
}
/**
* Read from a Unix socket
*/
size_t Socket::read(unsigned char buf[], size_t length)
{
if(sockfd == -1)
throw std::runtime_error("Socket::read: Socket not connected");
size_t got = 0;
while(length)
{
ssize_t this_time = ::recv(sockfd, buf + got, length, MSG_NOSIGNAL);
if(this_time == 0)
break;
if(this_time == -1)
{
if(errno == EINTR)
this_time = 0;
else
throw std::runtime_error("Socket::read: Socket read failed");
}
got += this_time;
length -= this_time;
}
return got;
}
/**
* Write to a Unix socket
*/
void Socket::write(const unsigned char buf[], size_t length)
{
if(sockfd == -1)
throw std::runtime_error("Socket::write: Socket not connected");
size_t offset = 0;
while(length)
{
ssize_t sent = ::send(sockfd, buf + offset, length, MSG_NOSIGNAL);
if(sent == -1)
{
if(errno == EINTR)
sent = 0;
else
throw std::runtime_error("Socket::write: Socket write failed");
}
offset += sent;
length -= sent;
}
}
/**
* Unix Server Socket Constructor
*/
Server_Socket::Server_Socket(unsigned short port)
{
sockfd = -1;
int fd = ::socket(PF_INET, SOCK_STREAM, 0);
if(fd == -1)
throw std::runtime_error("Server_Socket: Unable to acquire socket");
sockaddr_in socket_info;
::memset(&socket_info, 0, sizeof(socket_info));
socket_info.sin_family = AF_INET;
socket_info.sin_port = htons(port);
// FIXME: support limiting listeners
socket_info.sin_addr.s_addr = INADDR_ANY;
if(::bind(fd, (sockaddr*)&socket_info, sizeof(struct sockaddr)) != 0)
{
::close(fd);
throw std::runtime_error("Server_Socket: bind failed");
}
if(listen(fd, 100) != 0) // FIXME: totally arbitrary
{
::close(fd);
throw std::runtime_error("Server_Socket: listen failed");
}
sockfd = fd;
}
#endif
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