network.c

#include <arpa/inet.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <fcntl.h>
#include <stdio.h>
#include <string.h>

#include "network.h"

int connect_to_server(char *address, int port)
{
    int sockfd;
    struct sockaddr_in servaddr;

    // socket create and verification
    sockfd = socket(AF_INET, SOCK_DGRAM, 0);
    if (sockfd == -1)
    {
        printf("socket failed!\n");
        return -1;
    }

    memset(&servaddr, 0, sizeof(servaddr));

    // assign IP, PORT
    servaddr.sin_family = AF_INET;
    servaddr.sin_addr.s_addr = inet_addr(address);
    servaddr.sin_port = htons(port);

    if (connect(sockfd, &servaddr, sizeof(servaddr)) != 0)
    {
        printf("connection failed!\n");
        return -1;
    }

    fcntl(sockfd, F_SETFL, O_NONBLOCK);
    return sockfd;
}

int bind_socket(int port)
{
    struct sockaddr_in si_me;
    int s;
    if ((s = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP)) == -1)
    {
        printf("Failed to get socket!\n");
        return -1;
    }

    memset((char *)&si_me, 0, sizeof(si_me));

    si_me.sin_family = AF_INET;
    si_me.sin_port = htons(port);
    si_me.sin_addr.s_addr = htonl(INADDR_ANY);

    // bind socket to port
    if (bind(s, (struct sockaddr *)&si_me, sizeof(si_me)) == -1)
    {
        printf("Failed to get bound!\n");
        return -1;
    }
    return s;
}