ddos/server.c
author Markus Bröker <mbroeker@largo.dyndns.tv>
Sat, 13 Dec 2008 17:57:57 +0100
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/**
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 * $Id: server.c,v 1.1.1.1 2008-04-28 17:32:53 mbroeker Exp $
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 * $Source: /development/c/demos/ddos/server.c,v $
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 *
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 */
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <sys/socket.h>
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#include <netinet/in.h>
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#include <arpa/inet.h>
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#include <sys/types.h>
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#include <signal.h>
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int set_limit (int);
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int main (int argc, char **argv)
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{
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    char message[81];
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    int server_socket;
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    int client_socket;
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    struct sockaddr_in sa;
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    struct sockaddr_in ca;
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    socklen_t size;
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    int len;
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    int status;
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    pid_t pid;
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    pid_t parent_pid;
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    server_socket = socket (AF_INET, SOCK_STREAM, IPPROTO_TCP);
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    if (server_socket == -1) {
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        perror ("socket");
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        return EXIT_FAILURE;
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    }
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    sa.sin_family = AF_INET;
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    sa.sin_port = htons (4000);
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    sa.sin_addr.s_addr = INADDR_ANY;
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    size = sizeof (sa);
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    status = bind (server_socket, (struct sockaddr *)&sa, size);
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    if (status != 0) {
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        perror ("BIND");
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        return EXIT_FAILURE;
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    }
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    status = listen (server_socket, 10);
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    if (status != 0) {
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        perror ("LISTEN");
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        return EXIT_FAILURE;
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    }
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    int links = 0;
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    parent_pid = getpid ();
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    /*
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     * Child quits immediately, father mustn't wait
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     */
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    signal (SIGCHLD, SIG_IGN);
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    if (set_limit (500) != 0) {
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        printf ("Cannot limit the process limit\n");
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        return EXIT_FAILURE;
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    }
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    for (;;) {
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        size = sizeof (ca);
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        client_socket = accept (server_socket, (struct sockaddr *)&sa, (socklen_t *) & size);
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        printf ("PARENT PID = %d\n", parent_pid);
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        pid = fork ();
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        switch (pid) {
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        case 0:                /* Child */
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            close (server_socket);
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            if ((len = read (client_socket, message, 80)) == -1)
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                break;
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            message[len] = 0;
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            len = write (client_socket, "Please wait...\r\n", 17);
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            sleep (10);
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            printf ("DELETING LINK [%04d] %04d\n", getpid (), links--);
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            shutdown (client_socket, SHUT_RDWR);
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            close (client_socket);
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            return 1;
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        case -1:
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            perror ("Fork Error");
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            close (client_socket);
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            /*
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             * server is still alive and will continue
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             * * when resources are available
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             */
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            break;
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        default:               /* PID > 0 */
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            close (client_socket);
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            printf ("Starting LINK [%04d] %04d\n", pid, links++);
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        }
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    }
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    close (server_socket);
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    return 0;
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}