166 lines
3.5 KiB
C
166 lines
3.5 KiB
C
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/*
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* ipsend.c (C) 1995 Darren Reed
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*
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* This was written to test what size TCP fragments would get through
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* various TCP/IP packet filters, as used in IP firewalls. In certain
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* conditions, enough of the TCP header is missing for unpredictable
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* results unless the filter is aware that this can happen.
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*
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* The author provides this program as-is, with no gaurantee for its
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* suitability for any specific purpose. The author takes no responsibility
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* for the misuse/abuse of this program and provides it for the sole purpose
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* of testing packet filter policies. This file maybe distributed freely
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* providing it is not modified and that this notice remains in tact.
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*
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* This was written and tested (successfully) on SunOS 4.1.x.
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*/
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#if !defined(lint) && defined(LIBC_SCCS)
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static char sccsid[] = "%W% %G% (C)1995 Darren Reed";
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#endif
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <netdb.h>
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#include <string.h>
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#include <sys/types.h>
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#include <sys/time.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 <netinet/in_systm.h>
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#include <netinet/ip.h>
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#include <netinet/tcp.h>
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#include <netinet/udp.h>
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#include <netinet/ip_icmp.h>
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#ifndef linux
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#include <netinet/ip_var.h>
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#include <netinet/tcpip.h>
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#endif
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#include "ip_compat.h"
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#ifdef linux
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#include <linux/sockios.h>
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#include "tcpip.h"
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#endif
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#include "ipt.h"
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extern char *optarg;
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extern int optind;
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#ifndef NO_IPF
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extern struct ipread snoop, pcap, etherf, iphex, tcpd, iptext;
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#endif
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extern int resolve(), ip_resend();
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int opts = 0;
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#ifndef DEFAULT_DEVICE
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# ifdef linux
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char default_device[] = "eth0";
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# else
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# ifdef sun
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char default_device[] = "le0";
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# else
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# ifdef ultrix
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char default_device[] = "ln0";
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# else
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# ifdef __bsdi__
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char default_device[] = "ef0";
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# else
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char default_device[] = "lan0";
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# endif
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# endif
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# endif
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# endif
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#else
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char default_device[] = DEFAULT_DEVICE;
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#endif
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void usage(prog)
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char *prog;
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{
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fprintf(stderr, "Usage: %s [options] <-r filename|-R filename>\n\
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\t\t-r filename\tsnoop data file to resend\n\
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\t\t-R filename\tlibpcap data file to resend\n\
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\toptions:\n\
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\t\t-d device\tSend out on this device\n\
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\t\t-g gateway\tIP gateway to use if non-local dest.\n\
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\t\t-m mtu\t\tfake MTU to use when sending out\n\
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", prog);
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exit(1);
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}
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int main(argc, argv)
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int argc;
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char **argv;
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{
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struct in_addr gwip;
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struct ipread *ipr = NULL;
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char *name = argv[0], *gateway = NULL, *dev = NULL;
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char c, *resend = NULL;
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int mtu = 1500;
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while ((c = getopt(argc, argv, "EHPSTXd:g:m:r:")) != -1)
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switch (c)
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{
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case 'd' :
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dev = optarg;
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break;
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case 'g' :
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gateway = optarg;
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break;
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case 'm' :
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mtu = atoi(optarg);
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if (mtu < 28)
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{
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fprintf(stderr, "mtu must be > 28\n");
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exit(1);
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}
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case 'r' :
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resend = optarg;
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break;
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#ifndef NO_IPF
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case 'E' :
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ipr = ðerf;
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break;
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case 'H' :
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ipr = &iphex;
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break;
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case 'P' :
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ipr = &pcap;
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break;
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case 'S' :
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ipr = &snoop;
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break;
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case 'T' :
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ipr = &tcpd;
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break;
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case 'X' :
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ipr = &iptext;
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break;
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#endif
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default :
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fprintf(stderr, "Unknown option \"%c\"\n", c);
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usage(name);
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}
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if (!ipr || !resend)
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usage(name);
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gwip.s_addr = 0;
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if (gateway && resolve(gateway, (char *)&gwip) == -1)
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{
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fprintf(stderr,"Cant resolve %s\n", gateway);
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exit(2);
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}
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if (!dev)
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dev = default_device;
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printf("Device: %s\n", dev);
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printf("Gateway: %s\n", inet_ntoa(gwip));
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printf("mtu: %d\n", mtu);
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return ip_resend(dev, mtu, ipr, gwip, resend);
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}
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