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libnet

    1: /*
    2:  *  $Id: ospf_hello.c,v 1.1.1.1 2012/02/21 22:14:23 misho Exp $
    3:  *
    4:  *  libnet 1.1
    5:  *  Build an OSPF Hello packet
    6:  *
    7:  *  Copyright (c) 1998 - 2004 Mike D. Schiffman <mike@infonexus.com>
    8:  *  All rights reserved.
    9:  *
   10:  *  Copyright (c) 1999, 2000 Andrew Reiter <areiter@bindview.com>
   11:  *  All rights reserved.
   12:  *
   13:  * Redistribution and use in source and binary forms, with or without
   14:  * modification, are permitted provided that the following conditions
   15:  * are met:
   16:  * 1. Redistributions of source code must retain the above copyright
   17:  *    notice, this list of conditions and the following disclaimer.
   18:  * 2. Redistributions in binary form must reproduce the above copyright
   19:  *    notice, this list of conditions and the following disclaimer in the
   20:  *    documentation and/or other materials provided with the distribution.
   21:  *
   22:  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   23:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   24:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   25:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   26:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   27:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   28:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   29:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   30:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   31:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   32:  * SUCH DAMAGE.
   33:  *
   34:  */
   35: 
   36: #if (HAVE_CONFIG_H)
   37: #include "../include/config.h"
   38: #endif
   39: #include "./libnet_test.h"
   40: 
   41: int
   42: main(int argc, char **argv)
   43: {
   44:     int c;
   45:     libnet_t *l;
   46:     libnet_ptag_t t;
   47:     u_long src, dst, nbr;
   48:     char errbuf[LIBNET_ERRBUF_SIZE];
   49:     u_char *to, *from, *neighbor;
   50:     u_char auth[8] = {0,0,0,0,0,0,0,0};
   51: 
   52: 
   53:     printf("libnet 1.1 OSPF Hello packet shaping[raw]\n");
   54: 
   55:     if (argc != 4) 
   56:     {
   57:         usage(argv[0]);
   58:     }
   59: 
   60:     from        = argv[1];
   61:     to          = argv[2];
   62:     neighbor    = argv[3];
   63: 
   64:     /*
   65:      *  Initialize the library.  Root priviledges are required.
   66:      */
   67:     l = libnet_init(
   68:             LIBNET_RAW4,                            /* injection type */
   69:             NULL,                                   /* network interface */
   70:             errbuf);                                /* errbuf */
   71:  
   72:     if (l == NULL)
   73:     {
   74:         fprintf(stderr, "libnet_init() failed: %s", errbuf);
   75:         exit(EXIT_FAILURE);
   76:     }
   77: 
   78:     /* Too lazy to check for error */
   79:     src = libnet_name2addr4(l, from, LIBNET_DONT_RESOLVE);
   80:     dst = libnet_name2addr4(l, to, LIBNET_DONT_RESOLVE);
   81:     nbr = libnet_name2addr4(l, neighbor, LIBNET_DONT_RESOLVE);
   82: 
   83:     t = libnet_build_ospfv2_hello(
   84:         0xffffffff,                                 /* netmask */
   85:         2,                                          /* interval */
   86:         0x00,                                       /* options */
   87:         0x00,                                       /* priority */
   88:         30,                                         /* dead int */
   89:         src,                                        /* router */
   90:         src,                                        /* router */
   91:         nbr,                                        /* neighbor */
   92:         NULL,                                       /* payload */
   93:         0,                                          /* payload size */
   94:         l,                                          /* libnet handle */
   95:         0);                                         /* libnet id */
   96:     if (t == -1)
   97:     {
   98:         fprintf(stderr, "Can't build OSPF HELLO header: %s\n", libnet_geterror(l));
   99:         goto bad;
  100:     }
  101: 
  102:     /* authentication data */
  103:     t = libnet_build_data(
  104:         auth,                                       /* auth data */
  105:         LIBNET_OSPF_AUTH_H,                         /* payload size */
  106:         l,                                          /* libnet handle */
  107:         0);                                         /* libnet id */
  108:     if (t == -1)
  109:     {
  110:         fprintf(stderr, "Can't build OSPF auth header: %s\n", libnet_geterror(l));
  111:         goto bad;
  112:     }
  113: 
  114:     t = libnet_build_ospfv2(
  115:         LIBNET_OSPF_HELLO_H + LIBNET_OSPF_AUTH_H,   /* OSPF packet length */
  116:         LIBNET_OSPF_HELLO,                          /* OSPF packet type */
  117:         htonl(0xd000000d),                          /* router id */
  118:         htonl(0xc0ffee00),                          /* area id */
  119:         0,                                          /* checksum */
  120:         LIBNET_OSPF_AUTH_NULL,                      /* auth type */
  121:         NULL,                                       /* payload */
  122:         0,                                          /* payload size */
  123:         l,                                          /* libnet handle */
  124:         0);                                         /* libnet id */
  125: 
  126:     if (t == -1)
  127:     {
  128:         fprintf(stderr, "Can't build OSPF header: %s\n", libnet_geterror(l));
  129:         goto bad;
  130:     }
  131:   
  132:     t = libnet_build_ipv4(
  133:         LIBNET_IPV4_H + LIBNET_OSPF_H +
  134:         LIBNET_OSPF_HELLO_H + LIBNET_OSPF_AUTH_H,   /* packet total legnth */
  135:         0,                                          /* TOS */
  136:         101,                                        /* IP iD */
  137:         IP_DF,                                      /* IP frag */
  138:         254,                                        /* TTL */
  139:         IPPROTO_OSPF,                               /* protocol */
  140:         0,                                          /* checksum */
  141:         src,                                        /* source IP */
  142:         dst,                                        /* destination IP */
  143:         NULL,                                       /* payload */
  144:         0,                                          /* payload size */
  145:         l,                                          /* libnet handle */
  146:         0);                                         /* libnet id */
  147:     if (t == -1)
  148:     {
  149:         fprintf(stderr, "Can't build IP header: %s\n", libnet_geterror(l));
  150:         goto bad;
  151:     }
  152: 
  153:     /*
  154:      *  Write it to the wire.
  155:      */
  156:     c = libnet_write(l);
  157:     if (c == -1)
  158:     {
  159:         fprintf(stderr, "Write error: %s\n", libnet_geterror(l));
  160:         goto bad;
  161:     }
  162:     else
  163:     {
  164:         fprintf(stderr, "Wrote %d byte OSPF packet; check the wire.\n", c);
  165:     }
  166:     libnet_destroy(l);
  167:     return (EXIT_SUCCESS);
  168: bad:
  169:     libnet_destroy(l);
  170:     return (EXIT_FAILURE);
  171: }
  172: 
  173: 
  174: void
  175: usage(char *pname)
  176: {
  177:     printf("Usage: %s <source ip> <dest. ip> <neighbor>\n", pname);
  178:     exit(EXIT_SUCCESS);
  179: }