sockets.c

/*
 * Copyright (C) 2014  Tomasz Kramkowski <tk@the-tk.com>
 *
 * This program is free software. It is licensed under version 3 of the
 * GNU General Public License.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see [http://www.gnu.org/licenses/].
 */

// A total mess of attempts at socket programming. (Relatively successful.)
#include<stdio.h>
#include<string.h>
#include<sys/socket.h>
#include<arpa/inet.h>
#include<netdb.h>

#define messagelength 1000000

int main(int argc, char *argv[]) {
        char *hostname = "feeds.feedburner.com";
        char ip[100];
        struct hostent *he;
        struct in_addr **addr_list;
        int i;

        if ( (he = gethostbyname( hostname ) ) == NULL) {
                //gethostbyname failed
                herror("gethostbyname");
                return 1;
        }

        addr_list = (struct in_addr **) he->h_addr_list;

        for(i = 0; addr_list[i] != NULL; i++) {
                strcpy(ip, inet_ntoa(*addr_list[i]) );
        }

        printf("%s resolved to : %s\n", hostname, ip);

        int socket_desc;
        struct sockaddr_in server;
        char *message, server_reply[messagelength];

        socket_desc = socket(AF_INET, SOCK_STREAM, 0);
        if (socket_desc == -1) {
                printf("Could not create socket");
        }

        server.sin_addr.s_addr = inet_addr(ip);
        server.sin_family = AF_INET;
        server.sin_port = htons( 80 );

        if (connect(socket_desc, (struct sockaddr *)&server, sizeof(server)) < 0) {
                puts("connect error");
                return 1;
        }

        puts("Connected\n");

        message = "HEAD /Explosm HTTP/1.1\r\nHost: feeds.feedburner.com\r\n\r\n";
        if( send(socket_desc , message , strlen(message) , 0) < 0) {
                puts("Send failed");
                return 1;
        }
        puts("Data Send\n");

        if( recv(socket_desc, server_reply , messagelength, 0) < 0) {
                puts("recv failed");
        }
        puts("Reply received\n");
        puts(server_reply);

        return 0;
}