ddos/server.c
author Markus Bröker<broeker.markus@googlemail.com>
Fri, 20 Oct 2017 06:41:27 +0200
changeset 168 dfb60716880c
parent 161 36f763c8ab16
permissions -rw-r--r--
Broken OSX Demo added
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/**
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49e0babccb23 HEADER TAGS
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 * ddos/server.c
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c3fecc82ade6 standard tags for git projects
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 * Copyright (C) 2008 Markus Broeker
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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 <sys/types.h>
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#include <netdb.h>
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#include <netinet/in.h>
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#include <signal.h>
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int set_proc_limit (int);
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#define SVPORT "4000"
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#define MAXLEN 1024
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#define MAXMEM 200
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int server_write (int client_socket, char *s)
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{
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    if (s == NULL) {
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        fprintf (stderr, "Invalid data: s == NULL");
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        return -1;
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    }
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    return write (client_socket, s, strlen (s));
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}
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int server_init (char *port)
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{
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    int server_socket, status;
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    struct addrinfo hints;
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    struct addrinfo *result, *rp;
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    int yes = 1, no = 0;
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    memset (&hints, 0, sizeof (hints));
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    hints.ai_family = AF_UNSPEC;
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    hints.ai_socktype = SOCK_STREAM;
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    hints.ai_flags = AI_PASSIVE;
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    if (getaddrinfo (NULL, "4000", &hints, &result) < 0) {
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        perror ("GETADDRINFO");
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        return -1;
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    }
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    server_socket = -1;
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    for (rp = result; rp != NULL; rp = rp->ai_next) {
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        if ((server_socket = socket (rp->ai_family, rp->ai_socktype, rp->ai_protocol)) < 0) {
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            perror ("SOCKET");
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            continue;
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        }
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        // enable rebinding of the socket
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        if (setsockopt (server_socket, SOL_SOCKET, SO_REUSEADDR, &yes, sizeof (int)) == -1) {
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            perror ("setsockopt");
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            return -1;
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        }
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        // disable IPV6ONLY, eg enable an hybrid socket
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        if (rp->ai_family == AF_INET6)
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            if (setsockopt (server_socket, IPPROTO_IPV6, IPV6_V6ONLY, &no, sizeof (int)) == -1)
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                perror ("setsockopt");
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        if ((bind (server_socket, rp->ai_addr, rp->ai_addrlen)) == -1) {
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            perror ("BIND");
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            close (server_socket);
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            server_socket = -1;
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        } else {
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            printf ("bound to an %s socket on port %s\n", (rp->ai_family == AF_INET6) ? "IPv6" : "IPv4", port);
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        }
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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 -1;
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    }
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    if (result != NULL)
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        freeaddrinfo (result);
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    return server_socket;
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}
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int main (int argc, char **argv)
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{
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    int server_socket;
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    int client_socket;
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    char message[MAXLEN + 1];
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    int len;
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    pid_t pid;
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    pid_t parent_pid;
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    if ((server_socket = server_init (SVPORT)) < 0)
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        return EXIT_FAILURE;
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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_proc_limit (200) != 0) {
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        printf ("Cannot set the process limit\n");
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        return EXIT_FAILURE;
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    }
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    for (;;) {
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        client_socket = accept (server_socket, NULL, NULL);
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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, MAXLEN)) == -1)
0
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                break;
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            message[len] = '\0';
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            len = server_write (client_socket, "Please wait...\r\n");
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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 when resources are available
0
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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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    return close (server_socket);
0
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}