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/* RIP packet tracing
* Copyright 1991 Phil Karn, KA9Q
*
* Changes Copyright (c) 1993 Jeff White - N0POY, All Rights Reserved.
* Permission granted for non-commercial copying and use, provided
* this notice is retained.
*
* Rehack for RIP-2 (RFC1388) by N0POY 4/1993
*
* Beta release 11/10/93 V0.91
*
* 2/19/94 release V1.0
*
*/
#include <stdio.h>
#include "listen.h"
#define RIP_VERSION_2 2
#define RIP_VERSION_98 98
#define RIP_HEADER 4
#define RIP_ENTRY 20
#define RIP_AF_INET 2 /* IP Family */
#define RIPCMD_REQUEST 1 /* want info */
#define RIPCMD_RESPONSE 2 /* responding to request */
#define RIP98_ENTRY 6
static struct mask_struct
{
unsigned int mask;
unsigned int width;
}
mask_table[] =
{
{0xFFFFFFFF, 32},
{0xFFFFFFFE, 31},
{0xFFFFFFFC, 30},
{0xFFFFFFF8, 29},
{0xFFFFFFF0, 28},
{0xFFFFFFE0, 27},
{0xFFFFFFC0, 26},
{0xFFFFFF80, 25},
{0xFFFFFF00, 24},
{0xFFFFFE00, 23},
{0xFFFFFC00, 22},
{0xFFFFF800, 21},
{0xFFFFF000, 20},
{0xFFFFE000, 19},
{0xFFFFC000, 18},
{0xFFFF8000, 17},
{0xFFFF0000, 16},
{0xFFFE0000, 15},
{0xFFFC0000, 14},
{0xFFF80000, 13},
{0xFFF00000, 12},
{0xFFE00000, 11},
{0xFFC00000, 10},
{0xFF800000, 9},
{0xFF000000, 8},
{0xFE000000, 7},
{0xFC000000, 6},
{0xF8000000, 5},
{0xF0000000, 4},
{0xE0000000, 3},
{0xC0000000, 2},
{0x80000000, 1},
{0x00000000, 0},
};
static unsigned int mask2width(unsigned int mask)
{
struct mask_struct *t;
for (t = mask_table; t->mask != 0; t++)
if (mask == t->mask)
return t->width;
return 0;
}
void rip_dump(unsigned char *data, int length)
{
int i;
int cmd;
int version;
int domain;
char ipaddmask[25];
lprintf(T_PROTOCOL, "RIP: ");
cmd = data[0];
version = data[1];
domain = get16(data + 2);
length -= RIP_HEADER;
data += RIP_HEADER;
switch (cmd)
{
case RIPCMD_REQUEST:
lprintf(T_IPHDR, "REQUEST");
break;
case RIPCMD_RESPONSE:
lprintf(T_IPHDR, "RESPONSE");
break;
default:
lprintf(T_IPHDR, " cmd %u", cmd);
break;
}
switch (version)
{
case RIP_VERSION_98: /* IPGATE **/
lprintf(T_IPHDR, " vers %u entries %u\n", version, length / RIP98_ENTRY);
i = 0;
while (length >= RIP98_ENTRY)
{
sprintf(ipaddmask, "%u.%u.%u.%u/%-2u", data[0], data[1], data[2], data[3], data[4]);
lprintf(T_ADDR, "%-16s %-3u ", ipaddmask, data[5]);
if ((++i % 3) == 0) lprintf(T_IPHDR, "\n");
length -= RIP98_ENTRY;
data += RIP98_ENTRY;
}
if ((i % 3) != 0) lprintf(T_IPHDR, "\n");
break;
default:
lprintf(T_IPHDR, " vers %u entries %u domain %u:\n", version, length / RIP_ENTRY, domain);
i = 0;
while (length >= RIP_ENTRY)
{
if (get16(data + 0) != RIP_AF_INET)
{
/* Skip non-IP addresses */
length -= RIP_ENTRY;
data += RIP_ENTRY;
continue;
}
if (version >= RIP_VERSION_2)
{
sprintf(ipaddmask, "%u.%u.%u.%u/%-4d", data[4], data[5], data[6], data[7],
mask2width(get32(data + 8)));
}
else
{
sprintf(ipaddmask, "%u.%u.%u.%u/??", data[4], data[5], data[6], data[7]);
}
lprintf(T_ADDR, "%-20s%-3u", ipaddmask, get32(data + 16));
if ((++i % 3) == 0) lprintf(T_IPHDR, "\n");
length -= RIP_ENTRY;
data += RIP_ENTRY;
}
if ((i % 3) != 0) lprintf(T_IPHDR, "\n");
break;
}
}
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