UDPServerSocket.cpp

#include "UDPServerSocket.h"
#include <iostream>

using namespace std;
UDPServerSocket::UDPServerSocket(): UDPSocket() {} // Constructor: invoking parent constructor
bool UDPServerSocket::initialize(char * _addr, int _myPort) {
    struct hostent * hp; //A pointer to a host information structure
    if (_addr != NULL) { // If _peerAddr not equal to NULL then allocate memory and copy its value into peerAddress
        myAddress = (char * ) calloc(strlen(_addr) + 10, sizeof(char));
        strcpy(myAddress, _addr);
    } else myAddress = NULL;
    myPort = _myPort; // set port
    // if sock is -1 then it was not initialized before, and so we can create a new socket
    if (sock == -1) sock = socket(AF_INET, SOCK_DGRAM, 0);
    if (sock == -1) return false; // If sock == -1 after invoking the socket system call then and error occured
    sockaddr * myAddrCast = (sockaddr * ) & myAddr; // Setup myAddr
    myAddr.sin_family = AF_INET;
    myAddr.sin_port = htons(myPort);
    if (myAddress != NULL && strcmp(myAddress, "") != 0) { // if peerAddress has a value then initialize peerAddr
        hp = gethostbyname(myAddress);
        memcpy((char * ) & myAddr.sin_addr, (char * ) hp->h_addr,hp->h_length);
    } else myAddr.sin_addr.s_addr = INADDR_ANY;
    if (bind(sock, myAddrCast, sizeof(sockaddr)) == 0) { // bind socket to address, and set socket read/write buffer.
        int buf_size = SOCKET_READ_BUFFER_SIZE;
        if (setsockopt(sock, SOL_SOCKET, SO_RCVBUF, (char * ) & buf_size, sizeof(int)) == -1) printf("Error: receive buffer\n");
        if (setsockopt(sock, SOL_SOCKET, SO_SNDBUF, (char * ) & buf_size, sizeof(int)) == -1) printf("Error: send buffer\n");
        enable();
        return true;
    } else return false;
}
UDPServerSocket::~UDPServerSocket() {}