Sending HTTP requests in C language

ex0.c

/*
@date: Fri Aug 24 00:32:44 -03 2018
@author: Dan Morris A.K.A jq2
@filename: ex0.c
@last_updated: Fri Aug 24 00:53:47 -03 2018
@description: Enviando requisições HTTP GET usando a API de soquetes do Unix/BSD (Berkeley sockets).
Exemplo desenvolvido para o 'Hacking-BR - Grupo de estudos' no Facebook.
*/



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

int main (int argc, char *argv[]) {

    struct sockaddr_in in;
    struct sockaddr_storage peer_addr;
    socklen_t peer_addr_len;
    int sock, port = atoi(argv[1]);
    ssize_t nread;
    char buf[1024];

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

    sock = socket(PF_INET, SOCK_STREAM, 0);

    int connect_result = connect(sock, (struct sockaddr *) &in, sizeof(in));

    send(sock, "GET / HTTP/1.1\r\n", 17, 0);

    for (;;) {
        peer_addr_len = sizeof(struct sockaddr_storage);
        nread = recvfrom(sock, buf, 1024, 0, (struct sockaddr *) &peer_addr, &peer_addr_len);

        if (nread == -1) {
            printf("Exiting...\n");
            exit(255);
            break;
        }
        else {
            printf("Recvfrom: %d\n", nread);
            printf("Message: %s\n", buf);
            break;
        }
    }
    return 0;
}