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/* NET/ROM header tracing routines
* Copyright 1991 Phil Karn, KA9Q
*
* Added decoding of INP route information frames, Jeroen (PE1RXQ)
*/
#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
#define UI 0x03
static void netrom_flags(int);
/* Display INP route information frames */
static void netrom_inp_dump(unsigned char *data, int length)
{
char node[10];
char alias[7];
int hops;
int tt;
int alen;
int i;
if (data[0]==0xff) {
lprintf(T_AXHDR, "INP Route Information Frame:\n");
i=1;
while (i<length-10) {
pax25(node, data+i);
i+=7;
hops=data[i++];
tt=data[i++]*256;
tt+=data[i++];
alias[0]=0;
while (i<length-data[i] && data[i]) {
if (data[i+1]==0x00) {
alen=data[i]-2;
alen=alen < 7 ? alen : 6;
memcpy(alias, data+i+2, alen);
alias[alen]=0;
}
i+=data[i];
}
i++;
lprintf(T_DATA, " %12s %-6s %6u %6u\n", node, alias, hops, tt);
}
}
}
/* Display NET/ROM network and transport headers */
void netrom_dump(unsigned char *data, int length, int hexdump, int type)
{
char tmp[15];
int i;
/* See if it is a routing broadcast */
if (data[0] == NR3NODESIG) {
/* Filter out INP routing frames */
if (type!=UI) {
netrom_inp_dump(data, length);
return;
}
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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