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Annotation of embedaddon/libnet/src/libnet_build_rip.c, revision 1.1.1.1

1.1       misho       1: /*
                      2:  *  $Id: libnet_build_rip.c,v 1.8 2004/01/03 20:31:01 mike 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 */