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libnet

    1: /*
    2:  *  $Id: libnet_build_rip.c,v 1.1.1.1 2012/02/21 22:14:23 misho Exp $
    3:  *
    4:  *  libnet
    5:  *  libnet_build_rip.c - RIP packet assembler
    6:  *
    7:  *  Copyright (c) 1998 - 2004 Mike D. Schiffman <mike@infonexus.com>
    8:  *  All rights reserved.
    9:  *
   10:  * Redistribution and use in source and binary forms, with or without
   11:  * modification, are permitted provided that the following conditions
   12:  * are met:
   13:  * 1. Redistributions of source code must retain the above copyright
   14:  *    notice, this list of conditions and the following disclaimer.
   15:  * 2. Redistributions in binary form must reproduce the above copyright
   16:  *    notice, this list of conditions and the following disclaimer in the
   17:  *    documentation and/or other materials provided with the distribution.
   18:  *
   19:  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   20:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   21:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   22:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   23:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   24:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   25:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   26:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   27:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   28:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   29:  * SUCH DAMAGE.
   30:  *
   31:  */
   32: 
   33: #if (HAVE_CONFIG_H)
   34: #include "../include/config.h"
   35: #endif
   36: #if (!(_WIN32) || (__CYGWIN__)) 
   37: #include "../include/libnet.h"
   38: #else
   39: #include "../include/win32/libnet.h"
   40: #endif
   41: 
   42: libnet_ptag_t
   43: libnet_build_rip(u_int8_t cmd, u_int8_t version, u_int16_t rd, u_int16_t af, u_int16_t rt,
   44:             u_int32_t addr, u_int32_t mask, u_int32_t next_hop, u_int32_t metric,
   45:             u_int8_t *payload, u_int32_t payload_s, libnet_t *l, libnet_ptag_t ptag)
   46: {
   47:     u_int32_t n, h;
   48:     libnet_pblock_t *p;
   49:     struct libnet_rip_hdr rip_hdr;
   50: 
   51:     if (l == NULL)
   52:     { 
   53:         return (-1);
   54:     } 
   55: 
   56:     n = LIBNET_RIP_H + payload_s;
   57:     h = 0;
   58: 
   59:     /*
   60:      *  Find the existing protocol block if a ptag is specified, or create
   61:      *  a new one.
   62:      */
   63:     p = libnet_pblock_probe(l, ptag, n, LIBNET_PBLOCK_RIP_H);
   64:     if (p == NULL)
   65:     {
   66:         return (-1);
   67:     }
   68: 
   69: 	memset(&rip_hdr, 0, sizeof(rip_hdr));
   70: 	rip_hdr.rip_cmd      = cmd;
   71:     rip_hdr.rip_ver      = version;
   72:     rip_hdr.rip_rd       = htons(rd);
   73:     rip_hdr.rip_af       = htons(af);
   74:     rip_hdr.rip_rt       = htons(rt);
   75:     rip_hdr.rip_addr     = htonl(addr);
   76:     rip_hdr.rip_mask     = htonl(mask);
   77:     rip_hdr.rip_next_hop = htonl(next_hop);
   78:     rip_hdr.rip_metric   = htonl(metric);
   79: 
   80:     n = libnet_pblock_append(l, p, (u_int8_t *)&rip_hdr, LIBNET_RIP_H);
   81:     if (n == -1)
   82:     {
   83:         goto bad;
   84:     }
   85: 
   86:     if ((payload && !payload_s) || (!payload && payload_s))
   87:     {
   88:         snprintf(l->err_buf, LIBNET_ERRBUF_SIZE,
   89: 			    "%s(): payload inconsistency\n", __func__);
   90:         goto bad;
   91:     }
   92: 
   93:     if (payload && payload_s)
   94:     {
   95:         n = libnet_pblock_append(l, p, payload, payload_s);
   96:         if (n == -1)
   97:         {
   98:             goto bad;
   99:         }
  100:     }
  101: 
  102:     return (ptag ? ptag : libnet_pblock_update(l, p, h, LIBNET_PBLOCK_RIP_H));
  103: bad:
  104:     libnet_pblock_delete(l, p);
  105:     return (-1);
  106: }
  107: 
  108: /* EOF */