daemon/Common/Connection.cpp

/** @addtogroup MCD_MCDIMPL_DAEMON_SRV
 * @{
 * @file
 *
 * Connection data.
 *
 * <!-- Copyright Giesecke & Devrient GmbH 2009 - 2012 -->
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. The name of the author may not be used to endorse or promote
 *    products derived from this software without specific prior
 *    written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
 * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
 * GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
#include <unistd.h>
#include <assert.h>
#include <cstring>
#include <errno.h>

#include "Connection.h"

//#define LOG_VERBOSE
#include "log.h"


//------------------------------------------------------------------------------
Connection::Connection(
    void
) {
	connectionData = NULL;
	// Set invalid socketDescriptor
	socketDescriptor = -1;
}


//------------------------------------------------------------------------------
Connection::Connection(
    int           socketDescriptor,
    sockaddr_un   *remote
) {
	assert(NULL != remote);
	assert(-1 != socketDescriptor);

	this->socketDescriptor = socketDescriptor;
	this->remote = *remote;
	connectionData = NULL;
}


//------------------------------------------------------------------------------
Connection::~Connection(
    void
) {
	LOG_V(" closing Connection...");
    if (socketDescriptor != -1)
        close(socketDescriptor);
    LOG_I(" Socket connection closed.");
}


//------------------------------------------------------------------------------
bool Connection::connect(
    const char *dest
) {
	bool ret = false;
	int32_t len;

	assert(NULL != dest);

	LOG_I(" Connecting to %s socket", dest);
	do {
		remote.sun_family = AF_UNIX;
		strncpy(remote.sun_path, dest, sizeof(remote.sun_path) - 1);
		if ((socketDescriptor = socket(AF_UNIX, SOCK_STREAM, 0)) < 0) {
            LOG_ERRNO("Can't open stream socket.");
			break;
		}
		len = strlen(remote.sun_path) + sizeof(remote.sun_family);
		// The Daemon socket is in the Abstract Domain(LINUX ONLY!)
		remote.sun_path[0] = 0;
		if (::connect(socketDescriptor, (struct sockaddr *) &remote, len) < 0) {
		    LOG_ERRNO("connect()");
			break;
		}
		ret = true;
	} while (false);

	return ret;
}


//------------------------------------------------------------------------------
size_t Connection::readData(
    void *buffer,
    uint32_t len
) {
    return readData(buffer, len, -1);
}


//------------------------------------------------------------------------------
size_t Connection::readData(
    void      *buffer,
    uint32_t  len,
    int32_t   timeout
) {
	size_t ret;
	struct timeval tv;
	struct timeval *ptv = NULL;
    fd_set readfds;

    assert(NULL != buffer);
	assert(-1 != socketDescriptor);

    do{

        if(timeout >= 0){
            // Calculate timeout value
            tv.tv_sec = timeout/1000;
            tv.tv_usec = (timeout - (tv.tv_sec * 1000)) * 1000;
            ptv = &tv;
        }

        FD_ZERO(&readfds);
        FD_SET(socketDescriptor, &readfds);
        ret = select(socketDescriptor + 1, &readfds, NULL, NULL, ptv);

        // check for read error
        if (-1 == (int)ret) {
            LOG_ERRNO("select");
            break;
        }

        // Handle case of no descriptor ready
        if (0 == ret) {
            LOG_W(" Timeout during select() / No more notifications.");
            ret = -2;
            break;
        }

        // one or more descriptors are ready

        // finally check if fd has been selected -> must socketDescriptor
        if (!FD_ISSET(socketDescriptor, &readfds))
        {
            LOG_ERRNO("no fd is set, select");
            break;
        }

        ret = recv(socketDescriptor, buffer, len, MSG_WAITALL);
        if(0 == ret)
        {
            LOG_V(" readData(): peer orderly closed connection.");
            break;
        }
//        if (ret != len)
//        {
//            LOG_ERRNO("could not receive all requested data because read");
//            LOG_E("ret = %d", ret);
//            ret = -1;
//        }

    }while(false);

	return ret;
}


//------------------------------------------------------------------------------
size_t Connection::writeData(
    void *buffer,
    uint32_t len
) {
	size_t ret;

	assert(NULL != buffer);
	assert(-1 != socketDescriptor);

    ret = send(socketDescriptor, buffer, len, 0);
    if (ret != len)
    {
        LOG_ERRNO("could not send all data, because send");
        LOG_E("ret = %d", ret);
        ret = -1;
    }

    return ret;
}

/** @} */