/* 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;
	}
}