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NetBSD/usr.sbin/isdn/isdntrace/q921.c
martin fbf08005d7 Import of essential ISDN4BSD userland utilities and their documentation. 
The left out parts (which have not been installed by ISDN4BSD on NetBSD
anyway), may be added as pkgs later (if demand exists).
2001-01-06 13:00:10 +00:00

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/*
* Copyright (c) 1996 Gary Jennejohn. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the author nor the names of any co-contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
*---------------------------------------------------------------------------*
*
* q.921.c - print Q.921 traces
* ----------------------------
*
* $Id: q921.c,v 1.1.1.1 2001/01/06 13:00:30 martin Exp $
*
* $FreeBSD$
*
* last edit-date: [Mon Dec 13 21:56:46 1999]
*
*---------------------------------------------------------------------------*/
#include "trace.h"
/*---------------------------------------------------------------------------*
* decode LAPD (Q.921) protocol
*---------------------------------------------------------------------------*/
int
decode_lapd(char *pbuf, int n, unsigned char *buf, int dir, int raw, int printit)
{
int sap, tei, cmd, p_f;
int cnt = 0;
int i;
char locbuf[32000];
char *lbufp = &locbuf[0];
*lbufp = '\0';
*pbuf = '\0';
sap = (buf[0] >> 2) & 0x3f;
cnt++;
tei = buf[1] >> 1;
cnt++;
if(dir == FROM_TE)
cmd = !(buf[0] & 2);
else
cmd = buf[0] & 2;
switch (sap)
{
/* SAPI control procedures */
case 0:
{
if(printit)
sprintf((lbufp+strlen(lbufp)), "Q921: SAP=%d (Call Control), %c, TEI=%d, ", sap, cmd?'C':'R', tei);
if((buf[2] & 0x01) == 0)
{
if(printit)
sprintf((lbufp+strlen(lbufp)), "I-Frame: ");
p_f = buf [3] & 1;
if(printit)
sprintf((lbufp+strlen(lbufp)), "N(S) %d N(R) %d P %d ", buf [2] >> 1, buf [3] >> 1, p_f);
cnt += 2;
}
else if((buf[2] & 0x03) == 0x01)
{
if(printit)
sprintf((lbufp+strlen(lbufp)), "S-Frame: ");
p_f = buf [3] & 1;
cmd = buf [2] & 0x0c;
if(printit)
{
if (cmd == 0)
sprintf((lbufp+strlen(lbufp)), "RR N(R) %d PF %d ", buf [3] >> 1, p_f);
if (cmd == 4)
sprintf((lbufp+strlen(lbufp)), "RNR N(R) %d PF %d ", buf [3] >> 1, p_f);
if (cmd == 8)
sprintf((lbufp+strlen(lbufp)), "REJ N(R) %d PF %d ", buf [3] >> 1, p_f);
}
cnt += 2;
}
else if((buf[2] & 0x03) == 0x03)
{
if(printit)
sprintf((lbufp+strlen(lbufp)), "U-Frame: ");
p_f = (buf [2] & 0x10) >> 4;
cmd = buf [2] & 0xec;
if(printit)
{
if (cmd == 0x6c)
sprintf((lbufp+strlen(lbufp)), "SABME PF %d ", p_f);
if (cmd == 0x0c)
sprintf((lbufp+strlen(lbufp)), "DM PF %d ", p_f);
if (cmd == 0)
sprintf((lbufp+strlen(lbufp)), "UI PF %d ", p_f);
if (cmd == 0x40)
sprintf((lbufp+strlen(lbufp)), "DISC PF %d ", p_f);
if (cmd == 0x60)
sprintf((lbufp+strlen(lbufp)), "UA PF %d ", p_f);
if (cmd == 0x84)
sprintf((lbufp+strlen(lbufp)), "FRMR PF %d ", p_f);
if (cmd == 0xac)
sprintf((lbufp+strlen(lbufp)), "XID PF %d ", p_f);
/* information field ??? */
}
cnt++;
}
break;
}
/* D channel X.25 */
case 16:
if(printit)
sprintf((lbufp+strlen(lbufp)), "Q921: SAP=%d (X.25), %c, TEI=%d, ", sap, cmd?'C':'R', tei);
cnt = n;
goto dump;
/* Loopback test */
case 32:
if(printit)
sprintf((lbufp+strlen(lbufp)), "Q921: SAP=%d (Loopbacktest), %c, TEI=%d, ", sap, cmd?'C':'R', tei);
cnt = n;
goto dump;
/* SAPI layer 2 management functions */
case 63:
{
if(printit)
sprintf((lbufp+strlen(lbufp)), "Q921: SAP=%d (TEI-Management), %c, TEI=%d, ", sap, cmd?'C':'R', tei);
if (tei != 127)
{
if(printit)
sprintf((lbufp+strlen(lbufp)), "ILLEGAL TEI\n");
cnt = n;
goto dump;
}
if (buf [2] != 3 && buf [3] != 0xf)
{
if(printit)
sprintf((lbufp+strlen(lbufp)), "invalid format!\n");
cnt = n;
goto dump;
}
cnt+= 2; /* UI + MEI */
if(printit)
sprintf((lbufp+strlen(lbufp)), "Ri=0x%04hx, ", *(short *)&buf[4]);
cnt += 2; /* Ri */
switch (buf[6])
{
case 1:
if(printit)
sprintf((lbufp+strlen(lbufp)), "IdRequest, Ai=%d", (buf [7] >> 1));
cnt += 2;
break;
case 2:
if(printit)
sprintf((lbufp+strlen(lbufp)), "IdAssign, Ai=%d", (buf [7] >> 1));
cnt += 2;
break;
case 3:
if(printit)
sprintf((lbufp+strlen(lbufp)), "IdDenied, Ai=%d", (buf [7] >> 1));
cnt += 2;
break;
case 4:
if(printit)
sprintf((lbufp+strlen(lbufp)), "IdCheckReq, Ai=%d", (buf [7] >> 1));
cnt += 2;
break;
case 5:
if(printit)
sprintf((lbufp+strlen(lbufp)), "IdCheckResp, Ai=%d", (buf [7] >> 1));
cnt += 2;
break;
case 6:
if(printit)
sprintf((lbufp+strlen(lbufp)), "IdRemove, Ai=%d", (buf [7] >> 1));
cnt += 2;
break;
case 7:
if(printit)
sprintf((lbufp+strlen(lbufp)), "IdVerify, Ai=%d", (buf [7] >> 1));
cnt += 2;
break;
default:
if(printit)
sprintf((lbufp+strlen(lbufp)), "Unknown Msg Type\n");
cnt = n;
goto dump;
}
break;
}
/* Illegal SAPI */
default:
if(printit)
sprintf((lbufp+strlen(lbufp)), "Q921: ERROR, SAP=%d (Illegal SAPI), %c, TEI=%d\n", sap, cmd?'C':'R', tei);
cnt = n;
goto dump;
}
dump:
if(printit)
sprintf((lbufp+strlen(lbufp)), "\n");
if(raw && printit)
{
int j;
for (i = 0; i < cnt; i += 16)
{
sprintf((pbuf+strlen(pbuf)),"Dump:%.3d ", i);
for (j = 0; j < 16; j++)
if (i + j < cnt)
sprintf((pbuf+strlen(pbuf)),"%02x ", buf[i + j]);
else
sprintf((pbuf+strlen(pbuf))," ");
sprintf((pbuf+strlen(pbuf))," ");
for (j = 0; j < 16 && i + j < cnt; j++)
if (isprint(buf[i + j]))
sprintf((pbuf+strlen(pbuf)),"%c", buf[i + j]);
else
sprintf((pbuf+strlen(pbuf)),".");
sprintf((pbuf+strlen(pbuf)),"\n");
}
}
sprintf((pbuf+strlen(pbuf)),"%s", &locbuf[0]);
return (cnt);
}
/* EOF */
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