contrib/ipfilter/ipsend/ipresend.c

   1 /*
   2  * ipresend.c (C) 1995-1998 Darren Reed
   3  *
   4  * This was written to test what size TCP fragments would get through
   5  * various TCP/IP packet filters, as used in IP firewalls.  In certain
   6  * conditions, enough of the TCP header is missing for unpredictable
   7  * results unless the filter is aware that this can happen.
   8  *
   9  * See the IPFILTER.LICENCE file for details on licencing.
  10  */
  11 #if defined(__sgi) && (IRIX > 602)
  12 # include <sys/ptimers.h>
  13 #endif
  14 #include <stdio.h>
  15 #include <stdlib.h>
  16 #include <unistd.h>
  17 #include <netdb.h>
  18 #include <string.h>
  19 #include <sys/types.h>
  20 #include <sys/param.h>
  21 #include <sys/time.h>
  22 #include <sys/socket.h>
  23 #include <netinet/in.h>
  24 #include <arpa/inet.h>
  25 #include <netinet/in_systm.h>
  26 #include <netinet/ip.h>
  27 #include <netinet/tcp.h>
  28 #include <netinet/udp.h>
  29 #include <netinet/ip_icmp.h>
  30 #ifndef linux
  31 #include <netinet/ip_var.h>
  32 #endif
  33 #include "ipsend.h"
  34
  35 #if !defined(lint)
  36 static const char sccsid[] = "%W% %G% (C)1995 Darren Reed";
  37 static const char rcsid[] = "@(#)$Id: ipresend.c,v 2.1.4.4 2002/12/06 11:40:35 darrenr Exp $";
  38 #endif
  39
  40
  41 extern  char    *optarg;
  42 extern  int     optind;
  43 #ifndef NO_IPF
  44 extern  struct  ipread  snoop, pcap, etherf, iphex, tcpd, iptext;
  45 #endif
  46
  47 int     opts = 0;
  48 #ifndef DEFAULT_DEVICE
  49 # ifdef linux
  50 char    default_device[] = "eth0";
  51 # else
  52 #  ifdef        sun
  53 char    default_device[] = "le0";
  54 #  else
  55 #   ifdef       ultrix
  56 char    default_device[] = "ln0";
  57 #   else
  58 #    ifdef      __bsdi__
  59 char    default_device[] = "ef0";
  60 #    else
  61 #     ifdef     __sgi
  62 char    default_device[] = "ec0";
  63 #     else
  64 char    default_device[] = "lan0";
  65 #     endif
  66 #    endif
  67 #   endif
  68 #  endif
  69 # endif
  70 #else
  71 char    default_device[] = DEFAULT_DEVICE;
  72 #endif
  73
  74
  75 static  void    usage __P((char *));
  76 int     main __P((int, char **));
  77
  78
  79 static void usage(prog)
  80 char    *prog;
  81 {
  82         fprintf(stderr, "Usage: %s [options] <-r filename|-R filename>\n\
  83 \t\t-r filename\tsnoop data file to resend\n\
  84 \t\t-R filename\tlibpcap data file to resend\n\
  85 \toptions:\n\
  86 \t\t-d device\tSend out on this device\n\
  87 \t\t-g gateway\tIP gateway to use if non-local dest.\n\
  88 \t\t-m mtu\t\tfake MTU to use when sending out\n\
  89 ", prog);
  90         exit(1);
  91 }
  92
  93
  94 int main(argc, argv)
  95 int     argc;
  96 char    **argv;
  97 {
  98         struct  in_addr gwip;
  99         struct  ipread  *ipr = NULL;
 100         char    *name =  argv[0], *gateway = NULL, *dev = NULL;
 101         char    *resend = NULL;
 102         int     mtu = 1500, c;
 103
 104         while ((c = getopt(argc, argv, "EHPRSTXd:g:m:r:")) != -1)
 105                 switch (c)
 106                 {
 107                 case 'd' :
 108                         dev = optarg;
 109                         break;
 110                 case 'g' :
 111                         gateway = optarg;
 112                         break;
 113                 case 'm' :
 114                         mtu = atoi(optarg);
 115                         if (mtu < 28)
 116                             {
 117                                 fprintf(stderr, "mtu must be > 28\n");
 118                                 exit(1);
 119                             }
 120                 case 'r' :
 121                         resend = optarg;
 122                         break;
 123                 case 'R' :
 124                         opts |= OPT_RAW;
 125                         break;
 126 #ifndef NO_IPF
 127                 case 'E' :
 128                         ipr = &etherf;
 129                         break;
 130                 case 'H' :
 131                         ipr = &iphex;
 132                         break;
 133                 case 'P' :
 134                         ipr = &pcap;
 135                         break;
 136                 case 'S' :
 137                         ipr = &snoop;
 138                         break;
 139                 case 'T' :
 140                         ipr = &tcpd;
 141                         break;
 142                 case 'X' :
 143                         ipr = &iptext;
 144                         break;
 145 #endif
 146                 default :
 147                         fprintf(stderr, "Unknown option \"%c\"\n", c);
 148                         usage(name);
 149                 }
 150
 151         if (!ipr || !resend)
 152                 usage(name);
 153
 154         gwip.s_addr = 0;
 155         if (gateway && resolve(gateway, (char *)&gwip) == -1)
 156             {
 157                 fprintf(stderr,"Cant resolve %s\n", gateway);
 158                 exit(2);
 159             }
 160
 161         if (!dev)
 162                 dev = default_device;
 163
 164         printf("Device:  %s\n", dev);
 165         printf("Gateway: %s\n", inet_ntoa(gwip));
 166         printf("mtu:     %d\n", mtu);
 167
 168         return ip_resend(dev, mtu, ipr, gwip, resend);
 169 }