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Version 1.2p1

    1: /*
    2:  *  $Id: libnet_build_rip.c,v 1.1.1.3 2023/09/27 11:11:38 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: #include "common.h"
   34: 
   35: libnet_ptag_t
   36: libnet_build_rip(uint8_t cmd, uint8_t version, uint16_t rd, uint16_t af,
   37: uint16_t rt, uint32_t addr, uint32_t mask, uint32_t next_hop,
   38: uint32_t metric, const uint8_t *payload, uint32_t payload_s, libnet_t *l,
   39: libnet_ptag_t ptag)
   40: {
   41:     uint32_t n, h;
   42:     libnet_pblock_t *p;
   43:     struct libnet_rip_hdr rip_hdr;
   44: 
   45:     if (l == NULL)
   46:     { 
   47:         return (-1);
   48:     } 
   49: 
   50:     n = LIBNET_RIP_H + payload_s;
   51:     h = 0;
   52: 
   53:     /*
   54:      *  Find the existing protocol block if a ptag is specified, or create
   55:      *  a new one.
   56:      */
   57:     p = libnet_pblock_probe(l, ptag, n, LIBNET_PBLOCK_RIP_H);
   58:     if (p == NULL)
   59:     {
   60:         return (-1);
   61:     }
   62: 
   63:     memset(&rip_hdr, 0, sizeof(rip_hdr));
   64:     rip_hdr.rip_cmd      = cmd;
   65:     rip_hdr.rip_ver      = version;
   66:     rip_hdr.rip_rd       = htons(rd);
   67:     rip_hdr.rip_af       = htons(af);
   68:     rip_hdr.rip_rt       = htons(rt);
   69:     rip_hdr.rip_addr     = addr;
   70:     rip_hdr.rip_mask     = mask;
   71:     rip_hdr.rip_next_hop = next_hop;
   72:     rip_hdr.rip_metric   = htonl(metric);
   73: 
   74:     n = libnet_pblock_append(l, p, (uint8_t *)&rip_hdr, LIBNET_RIP_H);
   75:     if (n == -1)
   76:     {
   77:         goto bad;
   78:     }
   79: 
   80:     /* boilerplate payload sanity check / append macro */
   81:     LIBNET_DO_PAYLOAD(l, p);
   82: 
   83:     return (ptag ? ptag : libnet_pblock_update(l, p, h, LIBNET_PBLOCK_RIP_H));
   84: bad:
   85:     libnet_pblock_delete(l, p);
   86:     return (-1);
   87: }
   88: 
   89: /**
   90:  * Local Variables:
   91:  *  indent-tabs-mode: nil
   92:  *  c-file-style: "stroustrup"
   93:  * End:
   94:  */