udp_flood_disc.c

/* $Id$ */
/*
 *
 * Copyright (C) 2001-2003 FhG Fokus
 *
 * This file is part of ser, a free SIP server.
 *
 * ser is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version
 *
 * For a license to use the ser software under conditions
 * other than those described here, or to purchase support for this
 * software, please contact iptel.org by e-mail at the following addresses:
 *    info@iptel.org
 *
 * ser is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License 
 * along with this program; if not, write to the Free Software 
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */



#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <string.h>
#include <ctype.h>
#include <netdb.h>
#include <unistd.h>
#include <sys/types.h>
#include <fcntl.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#ifdef __linux__
#include <linux/types.h>
#include <linux/errqueue.h>
#endif


static char *id="$Id$";
static char *version="udp_flood_disc 0.1";
static char* help_msg="\
Usage: udp_flood -f file -d address -p port -c count [-v]\n\
Options:\n\
    -f file       file with the content of the udp packet (max 65k)\n\
    -d address    destination address\n\
    -p port       destination port\n\
    -c count      number of packets to be sent\n\
    -v            increase verbosity level\n\
    -V            version number\n\
    -h            this help message\n\
";

#define BUF_SIZE 65535


int main (int argc, char** argv)
{
        int fd;
        int sock;
        char c;
        int n,r;
        char* tmp;
        char* buf[BUF_SIZE];
        struct hostent* he;
        struct sockaddr_in addr;
        
        int count;
        int verbose;
        char *fname;
        char *dst;
        int port;
#ifdef __linux__
        int optval;
#endif
        
        /* init */
        count=0;
        verbose=0;
        fname=0;
        dst=0;
        port=0;

        opterr=0;
        while ((c=getopt(argc,argv, "f:c:d:p:vhV"))!=-1){
                switch(c){
                        case 'f':
                                fname=optarg;
                                break;
                        case 'v':
                                verbose++;
                                break;
                        case 'd':
                                dst=optarg;
                                break;
                        case 'p':
                                port=strtol(optarg, &tmp, 10);
                                if ((tmp==0)||(*tmp)){
                                        fprintf(stderr, "bad port number: -p %s\n", optarg);
                                        goto error;
                                }
                                break;
                        case 'c':
                                count=strtol(optarg, &tmp, 10);
                                if ((tmp==0)||(*tmp)){
                                        fprintf(stderr, "bad count: -c %s\n", optarg);
                                        goto error;
                                }
                                break;
                        case 'V':
                                printf("version: %s\n", version);
                                printf("%s\n",id);
                                exit(0);
                                break;
                        case 'h':
                                printf("version: %s\n", version);
                                printf("%s", help_msg);
                                exit(0);
                                break;
                        case '?':
                                if (isprint(optopt))
                                        fprintf(stderr, "Unknown option `-%c´\n", optopt);
                                else
                                        fprintf(stderr, "Unknown character `\\x%x´\n", optopt);
                                goto error;
                        case ':':
                                fprintf(stderr, "Option `-%c´ requires an argument.\n",
                                                optopt);
                                goto error;
                                break;
                        default:
                                        abort();
                }
        }
        
        /* check if all the required params are present */
        if (fname==0){
                fprintf(stderr, "Missing -f file\n");
                exit(-1);
        }
        if (dst==0){
                fprintf(stderr, "Missing destination (-d ...)\n");
                exit(-1);
        }
        if(port==0){
                fprintf(stderr, "Missing port number (-p port)\n");
                exit(-1);
        }else if(port<0){
                fprintf(stderr, "Invalid port number (-p %d)\n", port);
                exit(-1);
        }
        if(count==0){
                fprintf(stderr, "Missing packet count (-c number)\n");
                exit(-1);
        }else if(count<0){
                fprintf(stderr, "Invalid packet count (-c %d)\n", count);
                exit(-1);
        }
        
        /* open packet file */
        fd=open(fname, O_RDONLY);
        if (fd<0){
                fprintf(stderr, "ERROR: loading packet-file(%s): %s\n", fname,
                                strerror(errno));
                goto error;
        }
        n=read(fd, buf, BUF_SIZE);
        if (n<0){
                fprintf(stderr, "ERROR: reading file(%s): %s\n", fname,
                                strerror(errno));
                goto error;
        }
        if (verbose) printf("read %d bytes from file %s\n", n, fname);
        close(fd);

        /* resolve destination */
        he=gethostbyname(dst);
        if (he==0){
                fprintf(stderr, "ERROR: could not resolve %s\n", dst);
                goto error;
        }
        /* open socket*/
        addr.sin_family=he->h_addrtype;
        addr.sin_port=htons(port);
        memcpy(&addr.sin_addr.s_addr, he->h_addr_list[0], he->h_length);
        
        sock = socket(he->h_addrtype, SOCK_DGRAM, 0);
        if (sock==-1){
                fprintf(stderr, "ERROR: socket: %s\n", strerror(errno));
                goto error;
        }
#ifdef __linux__
        /* enable error receiving on unconnected sockets*/
        optval=1;
        if(setsockopt(sock,SOL_IP,IP_RECVERR,(void*)&optval,sizeof(optval))==-1){
                fprintf(stderr, "Error: setsockopt: %s\n", strerror(errno));
                exit(1);
        }
#endif


        /* flood loop */
        for (r=0; r<count; r++){
                if ((verbose>1)&&(r%1000))  putchar('.');
                if (sendto(sock,buf, n, 0, (struct sockaddr*) &addr, sizeof(addr))==-1)
                {
                        fprintf(stderr, "Error: send: %s\n",  strerror(errno));
                        exit(1);
                }
        }
        printf("\n%d packets sent, %d bytes each => total %d bytes\n",
                        count, n, n*count);

        close(sock);
        exit(0);

error:
        exit(-1);
}