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/* $OpenBSD: ipresend.c,v 1.4 1999/03/31 05:50:19 deraadt Exp $ */
/*
* ipresend.c (C) 1995-1997 Darren Reed
*
* This was written to test what size TCP fragments would get through
* various TCP/IP packet filters, as used in IP firewalls. In certain
* conditions, enough of the TCP header is missing for unpredictable
* results unless the filter is aware that this can happen.
*
* Redistribution and use in source and binary forms are permitted
* provided that this notice is preserved and due credit is given
* to the original author and the contributors.
*/
#if !defined(lint)
static const char sccsid[] = "%W% %G% (C)1995 Darren Reed";
static const char rcsid[] = "@(#)$Id: ipresend.c,v 1.4 1999/03/31 05:50:19 deraadt Exp $";
#endif
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <netdb.h>
#include <string.h>
#include <sys/types.h>
#include <sys/time.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <netinet/in_systm.h>
#include <netinet/ip.h>
#include <netinet/tcp.h>
#include <netinet/udp.h>
#include <netinet/ip_icmp.h>
#ifndef linux
#include <netinet/ip_var.h>
#endif
#include "ipsend.h"
extern char *optarg;
extern int optind;
#ifndef NO_IPF
extern struct ipread snoop, pcap, etherf, iphex, tcpd, iptext;
#endif
int opts = 0;
#ifndef DEFAULT_DEVICE
# ifdef linux
char default_device[] = "eth0";
# else
# if defined(sun) || defined(__OpenBSD__)
char default_device[] = "le0";
# else
# ifdef ultrix
char default_device[] = "ln0";
# else
# ifdef __bsdi__
char default_device[] = "ef0";
# else
# ifdef __sgi
char default_device[] = "ec0";
# else
char default_device[] = "lan0";
# endif
# endif
# endif
# endif
# endif
#else
char default_device[] = DEFAULT_DEVICE;
#endif
static void usage __P((char *));
int main __P((int, char **));
static void usage(prog)
char *prog;
{
fprintf(stderr, "Usage: %s [options] <-r filename|-R filename>\n\
\t\t-r filename\tsnoop data file to resend\n\
\t\t-R filename\tlibpcap data file to resend\n\
\toptions:\n\
\t\t-d device\tSend out on this device\n\
\t\t-g gateway\tIP gateway to use if non-local dest.\n\
\t\t-m mtu\t\tfake MTU to use when sending out\n\
", prog);
exit(1);
}
int main(argc, argv)
int argc;
char **argv;
{
struct in_addr gwip;
struct ipread *ipr = NULL;
char *name = argv[0], *gateway = NULL, *dev = NULL;
char *resend = NULL;
int mtu = 1500, c;
while ((c = getopt(argc, argv, "EHPRSTXd:g:m:r:")) != -1)
switch (c)
{
case 'd' :
dev = optarg;
break;
case 'g' :
gateway = optarg;
break;
case 'm' :
mtu = atoi(optarg);
if (mtu < 28)
{
fprintf(stderr, "mtu must be > 28\n");
exit(1);
}
case 'r' :
resend = optarg;
break;
case 'R' :
opts |= OPT_RAW;
break;
#ifndef NO_IPF
case 'E' :
ipr = ðerf;
break;
case 'H' :
ipr = &iphex;
break;
case 'P' :
ipr = &pcap;
break;
case 'S' :
ipr = &snoop;
break;
case 'T' :
ipr = &tcpd;
break;
case 'X' :
ipr = &iptext;
break;
#endif
default :
fprintf(stderr, "Unknown option \"%c\"\n", c);
usage(name);
}
if (!ipr)
usage(name);
gwip.s_addr = 0;
if (gateway && resolve(gateway, (char *)&gwip) == -1)
{
fprintf(stderr,"Cant resolve %s\n", gateway);
exit(2);
}
if (!dev)
dev = default_device;
printf("Device: %s\n", dev);
printf("Gateway: %s\n", inet_ntoa(gwip));
printf("mtu: %d\n", mtu);
return ip_resend(dev, mtu, ipr, gwip, resend);
}
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