qotd/client/main.c

#include <arpa/inet.h> // inet_addr()
#include <netdb.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <strings.h> // bzero()
#include <sys/socket.h>
#include <unistd.h> // read(), write(), close()
#include <errno.h>
#include <stdbool.h>
#include "config.h"
void unescape(char *buffer, size_t buf_len)
{
    int i;
    bool last_is_escape = false;
    for (i = 0; i < buf_len; i++)
    {
        if (last_is_escape)
        {
            switch (buffer[i])
            {
            case 'n':
                buffer[i - 1] = ' ';
                buffer[i] = '\n';
            }
        }

        if (buffer[i] == '\\')
        {
            last_is_escape = true;
        }
        else
        {
            last_is_escape = false;
        }
    }
}

int main()
{
    int sockfd, connfd;
    struct sockaddr_in servaddr4, cli;

    unsigned int servaddrlength;
    // socket create and verification
    sockfd = socket(AF_INET, SOCK_STREAM, 0);
    if (sockfd == -1)
    {
        printf("socket creation failed...\n");
        exit(1);
    }

    // assign IP, PORT
    servaddr4.sin_family = AF_INET;
    servaddr4.sin_addr.s_addr = inet_addr("45.81.62.108");
    servaddr4.sin_port = htons(DEFAULT_LISTEN_PORT);

    int status = connect(sockfd, (struct sockaddr *)&servaddr4, sizeof servaddr4);
    // connect the client socket to server socket
    if (status != 0)
    {
        printf("%i\n", errno);
        printf("connection with the server failed...\n");

        exit(0);
    }

    struct sockaddr *servaddr = (struct sockaddr *)&servaddr4;
    unsigned int ss = sizeof servaddr;
    // function for chat
    char clientMessage[MESSAGE_STRING_LENGTH] = {0};
    recvfrom(sockfd, clientMessage, MESSAGE_STRING_LENGTH, 0, servaddr, &ss);
    unescape(clientMessage, (size_t)MESSAGE_STRING_LENGTH);
    puts(clientMessage);

    // close the socket
    close(sockfd);
}