uwApplication_UDP_socket.cpp

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//
// Copyright (c) 2017 Regents of the SIGNET lab, University of Padova.
// All rights reserved.
//
// 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. Neither the name of the University of Padova (SIGNET lab) nor the
//    names of its contributors may be used to endorse or promote products
//    derived from this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "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 COPYRIGHT OWNER OR
// CONTRIBUTORS 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 "uwApplication_module.h"
 
bool
uwApplicationModule::openConnectionUDP()
{
    int sockoptval = 1;
 
    // Create socket for incoming connections
    if ((servSockDescr = socket(AF_INET, SOCK_DGRAM, 0)) < 0) {
        printOnLog(Logger::LogLevel::ERROR,
                "UWAPPLICATION",
                "openConnectionUDP()::Socket creation failed");
 
        return false;
    }
 
    if (setsockopt(servSockDescr,
                SOL_SOCKET,
                SO_REUSEADDR,
                &sockoptval,
                sizeof(int)) == -1) {
        printOnLog(Logger::LogLevel::ERROR,
                "UWAPPLICATION",
                "openConnectionUDP()::Set socket failed");
    }
 
    printOnLog(Logger::LogLevel::INFO,
            "UWAPPLICATION",
            "openConnectionUDP()::Socket created");
 
    memset(&servAddr, 0, sizeof(servAddr));
    servAddr.sin_family = AF_INET;
    servAddr.sin_port = htons(servPort);
    servAddr.sin_addr.s_addr = htonl(INADDR_ANY);
 
    if (::bind(servSockDescr, (struct sockaddr *) &servAddr, sizeof(servAddr)) <
            0) {
        printOnLog(Logger::LogLevel::ERROR,
                "UWAPPLICATION",
                "openConnectionUDP()::Socket binding failed: " +
                        std::string(strerror(errno)));
 
        return false;
    }
 
    return true;
}
 
void
uwApplicationModule::readFromUDP()
{
    char buffer_msg[MAX_LENGTH_PAYLOAD];
    int recvMsgSize;
    socklen_t clnLen = sizeof(sockaddr_in);
 
    while (receiving.load()) {
        clnLen = sizeof(clnAddr);
        for (int i = 0; i < MAX_LENGTH_PAYLOAD; i++) {
            buffer_msg[i] = 0;
        }
 
        if ((recvMsgSize = recvfrom(servSockDescr,
                     buffer_msg,
                     MAX_LENGTH_PAYLOAD,
                     0,
                     (struct sockaddr *) &(clnAddr),
                     &clnLen)) < 0) {
 
            printOnLog(Logger::LogLevel::ERROR,
                    "UWAPPLICATION",
                    "readFromUDP()::Receive from socket failed");
 
            continue;
        }
 
        if (recvMsgSize > 0) {
            std::unique_lock<std::mutex> lk(socket_mutex);
            Packet *p = Packet::alloc();
            hdr_cmn *ch = HDR_CMN(p);
            hdr_DATA_APPLICATION *hdr_Appl = HDR_DATA_APPLICATION(p);
 
            printOnLog(Logger::LogLevel::DEBUG,
                    "UWAPPLICATION",
                    "readFromUDP()::Socket payload received : " +
                            std::string(buffer_msg, recvMsgSize));
 
            for (int i = 0; i < recvMsgSize; i++)
                hdr_Appl->payload_msg[i] = buffer_msg[i];
            ch->size() = recvMsgSize;
            hdr_Appl->payload_size() = recvMsgSize;
 
            queuePckReadUDP.push(p);
            incrPktsPushQueue();
        }
    }
}