ibrcommon/ibrcommon/net/tcpclient.cpp

Go to the documentation of this file.

/*
 * tcpclient.cpp
 *
 *  Created on: 29.07.2009
 *      Author: morgenro
 */

#include "ibrcommon/config.h"
#include "ibrcommon/net/tcpclient.h"
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <netdb.h>
#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include <streambuf>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <sstream>

namespace ibrcommon
{
        tcpclient::tcpclient()
        {
        }

        tcpclient::tcpclient(const ibrcommon::File &s)
        {
                open(s);
        }

        void tcpclient::open(const ibrcommon::File &s)
        {
                int len = 0;
                struct sockaddr_un saun;

                /*
                 * Get a socket to work with.  This socket will
                 * be in the UNIX domain, and will be a
                 * stream socket.
                 */
                if ((_socket = socket(AF_UNIX, SOCK_STREAM, 0)) < 0) {
                        throw SocketException("Could not create a socket.");
                }

                /*
                 * Create the address we will be connecting to.
                 */
                saun.sun_family = AF_UNIX;
                strcpy(saun.sun_path, s.getPath().c_str());

                /*
                 * Try to connect to the address.  For this to
                 * succeed, the server must already have bound
                 * this address, and must have issued a listen()
                 * request.
                 *
                 * The third argument indicates the "length" of
                 * the structure, not just the length of the
                 * socket name.
                 */
                len = sizeof(saun.sun_family) + strlen(saun.sun_path);

                if (connect(_socket, (struct sockaddr *)&saun, len) < 0) {
                        throw SocketException("Could not connect to the named socket.");
                }
        }

        tcpclient::tcpclient(const string &address, const int port, size_t timeout)
        {
                open(address, port, timeout);
        }

        void tcpclient::open(const string &address, const int port, size_t timeout)
        {
                struct addrinfo hints;
                struct addrinfo *walk;
                memset(&hints, 0, sizeof(struct addrinfo));
                hints.ai_family = PF_UNSPEC;
                hints.ai_socktype = SOCK_STREAM;

                struct addrinfo *res;
                int ret;

                std::stringstream ss; ss << port; std::string port_string = ss.str();

                if ((ret = getaddrinfo(address.c_str(), port_string.c_str(), &hints, &res)) != 0)
                {
                        throw SocketException("getaddrinfo(): " + std::string(gai_strerror(ret)));
                }

                if (res == NULL)
                {
                        throw SocketException("Could not connect to the server.");
                }

                try {
                        for (walk = res; walk != NULL; walk = walk->ai_next) {
                                _socket = socket(walk->ai_family, walk->ai_socktype, walk->ai_protocol);
                                if (_socket < 0){
                                        /* Hier kann eine Fehlermeldung hin, z.B. mit warn() */

                                        if (walk->ai_next ==  NULL)
                                        {
                                                throw SocketException("Could not create a socket.");
                                        }
                                        continue;
                                }

                                if (timeout == 0)
                                {
                                        if (connect(_socket, walk->ai_addr, walk->ai_addrlen) != 0) {
                                                ::close(_socket);
                                                _socket = -1;
                                                /* Hier kann eine Fehlermeldung hin, z.B. mit warn() */
                                                if (walk->ai_next ==  NULL)
                                                {
                                                        throw SocketException("Could not connect to the server.");
                                                }
                                                continue;
                                        }
                                }
                                else
                                {
                                        // timeout is requested, set socket to non-blocking
                                        vsocket::set_non_blocking(_socket);

                                        // now connect to the host (this returns immediately
                                        ::connect(_socket, walk->ai_addr, walk->ai_addrlen);

                                        try {
                                                bool read = false;
                                                bool write = true;
                                                bool error = false;

                                                // now wait until we could write on this socket
                                                tcpstream::select(_interrupt_pipe_read[1], read, write, error, timeout);

                                                // set the socket to blocking again
                                                vsocket::set_non_blocking(_socket, false);

                                                // check if the attempt was successful
                                                int err = 0;
                                                socklen_t err_len = sizeof(err_len);
                                                ::getsockopt(_socket, SOL_SOCKET, SO_ERROR, &err, &err_len);

                                                if (err != 0)
                                                {
                                                        throw SocketException("Could not connect to the server.");
                                                }
                                        } catch (const select_exception &ex) {
                                                throw SocketException("Could not connect to the server.");
                                        }
                                }
                                break;
                        }

                        freeaddrinfo(res);
                } catch (ibrcommon::Exception&) {
                        freeaddrinfo(res);
                        throw;
                }
        }

        tcpclient::~tcpclient()
        {
        }
}