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/* @(#) $Header: /home/ax25-cvs/ax25-apps/listen/nrdump.c,v 1.1 2001/04/10 01:58:54 csmall Exp $ */
/* NET/ROM header tracing routines
* Copyright 1991 Phil Karn, KA9Q
*/
#include <stdio.h>
#include <string.h>
#include "listen.h"
#define AXLEN 7
#define ALEN 6
#define NRPROTO_IP 0x0C
#define NR4OPCODE 0x0F
#define NR4OPPID 0
#define NR4OPCONRQ 1
#define NR4OPCONAK 2
#define NR4OPDISRQ 3
#define NR4OPDISAK 4
#define NR4OPINFO 5
#define NR4OPACK 6
#define NR4MORE 0x20
#define NR4NAK 0x40
#define NR4CHOKE 0x80
#define NRDESTPERPACK 11
#define NR3NODESIG 0xFF
#define NR3POLLSIG 0xFE
static void netrom_flags(int);
/* Display NET/ROM network and transport headers */
void netrom_dump(unsigned char *data, int length, int hexdump)
{
char tmp[15];
register int i;
/* See if it is a routing broadcast */
if (data[0] == NR3NODESIG) {
memcpy(tmp, data + 1, ALEN);
tmp[ALEN] = '\0';
lprintf(T_AXHDR, "NET/ROM Routing: %s\n", tmp);
data += (ALEN + 1);
length -= (ALEN + 1);
for(i = 0;i < NRDESTPERPACK;i++) {
if (length < AXLEN) break;
lprintf(T_DATA," %12s", pax25(tmp, data));
memcpy(tmp, data + AXLEN, ALEN);
tmp[ALEN] = '\0';
lprintf(T_DATA, "%8s", tmp);
lprintf(T_DATA, " %12s", pax25(tmp, data + AXLEN + ALEN));
lprintf(T_DATA, " %3u\n", data[AXLEN + ALEN + AXLEN]);
data += (AXLEN + ALEN + AXLEN + 1);
length -= (AXLEN + ALEN + AXLEN + 1);
}
return;
}
/* See if it is a JNOS style node poll */
if (data[0] == NR3POLLSIG) {
memcpy(tmp, data + 1, ALEN);
tmp[ALEN] = '\0';
lprintf(T_AXHDR, "NET/ROM Poll: %s\n", tmp);
return;
}
/* Decode network layer */
lprintf(T_AXHDR, "NET/ROM: ");
lprintf(T_ADDR, "%s->", pax25(tmp, data));
lprintf(T_ADDR, "%s", pax25(tmp, data + AXLEN));
lprintf(T_AXHDR," ttl %d\n", data[AXLEN + AXLEN]);
data += (AXLEN + AXLEN + 1);
length -= (AXLEN + AXLEN + 1);
switch (data[4] & NR4OPCODE) {
case NR4OPPID: /* network PID extension */
if (data[0] == NRPROTO_IP && data[1] == NRPROTO_IP) {
ip_dump(data + 5, length - 5, hexdump);
return;
} else {
lprintf(T_AXHDR, " protocol family %x, proto %x",
data[0], data[1]);
}
break;
case NR4OPCONRQ: /* Connect request */
lprintf(T_AXHDR, " conn rqst: my ckt %02X/%02X", data[0], data[1]);
lprintf(T_AXHDR, " wnd %d", data[5]);
lprintf(T_ADDR, " %s", pax25(tmp, data + 6));
lprintf(T_ADDR, "@%s", pax25(tmp, data + 6 + AXLEN));
data += AXLEN + AXLEN + 6;
length -= AXLEN + AXLEN + 6;
if (length > 0)
lprintf(T_AXHDR, " timeout %d", data[1] * 256 + data[0]);
lprintf(T_AXHDR, "\n");
break;
case NR4OPCONAK: /* Connect acknowledgement */
lprintf(T_AXHDR," conn ack: ur ckt %02X/%02X my ckt %02X/%02X", data[0], data[1], data[2], data[3]);
lprintf(T_AXHDR, " wnd %d", data[5]);
netrom_flags(data[4]);
break;
case NR4OPDISRQ: /* Disconnect request */
lprintf(T_AXHDR, " disc: ur ckt %02X/%02X\n", data[0], data[1]);
break;
case NR4OPDISAK: /* Disconnect acknowledgement */
lprintf(T_AXHDR, " disc ack: ur ckt %02X/%02X\n", data[0], data[1]);
break;
case NR4OPINFO: /* Information (data) */
lprintf(T_AXHDR, " info: ur ckt %02X/%02X", data[0], data[1]);
lprintf(T_AXHDR, " txseq %d rxseq %d", data[2], data[3]);
netrom_flags(data[4]);
data_dump(data + 5, length - 5, hexdump);
break;
case NR4OPACK: /* Information acknowledgement */
lprintf(T_AXHDR, " info ack: ur ckt %02X/%02X", data[0], data[1]);
lprintf(T_AXHDR, " rxseq %d", data[3]);
netrom_flags(data[4]);
break;
default:
lprintf(T_AXHDR, " unknown transport type %d\n", data[4] & 0x0f) ;
break;
}
}
static void netrom_flags(int flags)
{
if (flags & NR4CHOKE)
lprintf(T_AXHDR," CHOKE");
if (flags & NR4NAK)
lprintf(T_AXHDR," NAK");
if (flags & NR4MORE)
lprintf(T_AXHDR," MORE");
lprintf(T_AXHDR, "\n");
}
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