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freebsd-skq/usr.sbin/i4b/isdndecode/layer2.c

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Initial entry of ISDN4BSD into the FreeBSD tree. ISDN4BSD is the work of our brand-new comitter: Hellmuth Michaelis, who has done a tremendous amount of work to bring us this far. There are still some outstanding issues and files to bring into the tree, and for now it will be needed to pick up all the extra docs from the isdn4bsd release. It is probably also a very good idea to subscribe to the isdn@freebsd.org mailing list before you try this out. These files correspond to release "beta Version 0.70.00 / December 1998" from Hellmuth.
1998-12-27 21:47:14 +00:00
/*
* Copyright (c) 1997, 1998 Hellmuth Michaelis. 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.
*
* 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.
*
*---------------------------------------------------------------------------
*
* layer2.c - decode and print layer 2 (Q.921) information
* -------------------------------------------------------
*
* $Id: layer2.c,v 1.3 1998/12/18 17:09:38 hm Exp $
*
* last edit-date: [Fri Dec 18 18:12:09 1998]
*
*---------------------------------------------------------------------------*/
#include "decode.h"
/*---------------------------------------------------------------------------*
* decode poll bit
*---------------------------------------------------------------------------*/
static void
poll(int layer, char *buffer, int cnt, unsigned char value, unsigned char mask)
{
sprintline(layer, buffer, cnt, value, mask, "P/F, Poll = %s", (value & mask) ? "Immediate Response Required" : "No Immediate Response Required");
}
/*---------------------------------------------------------------------------*
* decode final bit
*---------------------------------------------------------------------------*/
static void
final(int layer, char *buffer, int cnt, unsigned char value, unsigned char mask)
{
sprintline(layer, buffer, cnt, value, mask, "P/F, Final = %s", (value & mask) ? "Result of Poll" : "No Result of Poll");
}
/*---------------------------------------------------------------------------*
* decode protocol specified in Q.921
*---------------------------------------------------------------------------*/
int
layer2(char *pbuf, unsigned char *buf, int dir, int printit)
{
int sap, tei, cmd;
int cnt = 0;
char locbuf[32000];
char *lbufp = &locbuf[0];
char buffer[80];
*lbufp = '\0';
*pbuf = '\0';
/* address high */
sap = (buf[0] >> 2) & 0x3f;
if(sap == 0)
strcpy(buffer, "Call Control");
else if((sap >= 1) && (sap <= 15))
strcpy(buffer, "Reserved");
else if(sap == 16)
strcpy(buffer, "X.25");
else if((sap >= 17) && (sap <= 31))
strcpy(buffer, "Reserved");
else if(sap == 63)
strcpy(buffer, "Layer 2 Management");
else
strcpy(buffer, "Not available for Q.921");
sprintline(2, lbufp+strlen(lbufp), cnt, buf[0], 0xfc, "SAPI = %d (%s)", sap, buffer);
if(dir == FROM_TE)
cmd = !(buf[0] & 0x02);
else
cmd = buf[0] & 0x02;
sprintline(2, lbufp+strlen(lbufp), cnt, buf[0], 0x02, "C/R = %s", cmd ? "Command" : "Response");
extension(2, lbufp+strlen(lbufp), cnt, buf[0], 0x01);
cnt++;
/* address low */
tei = buf[1] >> 1;
if((tei >= 0) && (tei <= 63))
strcpy(buffer, "Non-automatic TEI");
else if((tei >= 64) && (tei <= 126))
strcpy(buffer, "Automatic TEI");
if(tei == 127)
strcpy(buffer, "Group TEI");
sprintline(2, lbufp+strlen(lbufp), cnt, buf[1], 0xfe, "TEI = %d (%s)", tei, buffer);
extension(2, lbufp+strlen(lbufp), cnt, buf[1], 0x01);
cnt++;
/* control 1 */
if((buf[2] & 0x03) == 0x03)
{
/* U-frame */
if((buf[2] & 0xef) == 0x6f)
{
/* SABME */
sprintline(2, lbufp+strlen(lbufp), cnt, buf[2], 0xef, "U-Frame: SABME (Set Asynchonous Balanced Mode)");
poll(2, lbufp+strlen(lbufp), cnt, buf[2], 0x10);
cnt++;
}
else if((buf[2] & 0xef) == 0x0f)
{
/* DM */
sprintline(2, lbufp+strlen(lbufp), cnt, buf[2], 0xef, "U-Frame: DM (Disconnected Mode)");
final(2, lbufp+strlen(lbufp), cnt, buf[2], 0x10);
cnt++;
}
else if((buf[2] & 0xef) == 0x03)
{
/* UI */
sprintline(2, lbufp+strlen(lbufp), cnt, buf[2], 0xef, "U-Frame: UI (Unnumbered Information)");
poll(2, lbufp+strlen(lbufp), cnt, buf[2], 0x10);
cnt++;
if(sap == 63 && (buf[3] == 0x0f)) /* TEI management */
{
sprintline(2, lbufp+strlen(lbufp), cnt, buf[3], 0xff, "MEI (Management Entity Identifier)");
cnt++;
sprintline(2, lbufp+strlen(lbufp), cnt, buf[4], 0xff, "Ri = 0x%04x (Reference number high)", (buf[4] << 8) | buf[5]);
cnt++;
sprintline(2, lbufp+strlen(lbufp), cnt, buf[5], 0xff, "Ri (Reference Number low)");
cnt++;
switch(buf[6])
{
case 0x01:
strcpy(buffer, "Identity Request");
break;
case 0x02:
strcpy(buffer, "Identity Assigned");
break;
case 0x03:
strcpy(buffer, "Identity denied");
break;
case 0x04:
strcpy(buffer, "Identity Check Request");
break;
case 0x05:
strcpy(buffer, "Identity Check Response");
break;
case 0x06:
strcpy(buffer, "Identity Remove");
break;
case 0x07:
strcpy(buffer, "Identity Verify");
break;
default:
strcpy(buffer, "undefined");
break;
}
sprintline(2, lbufp+strlen(lbufp), cnt, buf[6], 0xff, "TEI %s (Message Type %d)", buffer, buf[6]);
cnt++;
switch(buf[6])
{
case 0x01:
strcpy(buffer, "Any TEI value acceptable");
break;
case 0x02:
strcpy(buffer, "");
break;
case 0x03:
strcpy(buffer, "No TEI Value available");
break;
case 0x04:
strcpy(buffer, "Check all TEI values");
break;
case 0x05:
strcpy(buffer, "");
break;
case 0x06:
strcpy(buffer, "Request for removal of all TEI values");
break;
case 0x07:
strcpy(buffer, "");
break;
default:
strcpy(buffer, "");
break;
}
if(((buf[7] >> 1) & 0x7f) == 127)
sprintline(2, lbufp+strlen(lbufp), cnt, buf[7], 0xfe, "Ai = %d (Action Indicator = %s)", (buf[7] >> 1) & 0x7f, buffer);
else
sprintline(2, lbufp+strlen(lbufp), cnt, buf[7], 0xfe, "Ai = %d (Action Indicator)", (buf[7] >> 1) & 0x7f);
extension(2, lbufp+strlen(lbufp), cnt, buf[7], 0x01);
cnt++;
}
}
else if((buf[2] & 0xef) == 0x43)
{
/* DISC */
sprintline(2, lbufp+strlen(lbufp), cnt, buf[2], 0xef, "U-Frame: DISC (Disconnect)");
poll(2, lbufp+strlen(lbufp), cnt, buf[2], 0x10);
cnt++;
}
else if((buf[2] & 0xef) == 0x63)
{
/* UA */
sprintline(2, lbufp+strlen(lbufp), cnt, buf[2], 0xef, "U-Frame: UA (Unnumbered Acknowledge)");
final(2, lbufp+strlen(lbufp), cnt, buf[2], 0x10);
cnt++;
}
else if((buf[2] & 0xef) == 0x87)
{
/* FRMR */
sprintline(2, lbufp+strlen(lbufp), cnt, buf[2], 0xef, "U-Frame: FRMR (Frame Reject)");
final(2, lbufp+strlen(lbufp), cnt, buf[2], 0x10);
cnt++;
}
else if((buf[2] & 0xef) == 0x9f)
{
/* XID */
sprintline(2, lbufp+strlen(lbufp), cnt, buf[2], 0xef, "U-Frame: XID (Exchange Identification)");
if(cmd)
poll(2, lbufp+strlen(lbufp), cnt, buf[2], 0x10);
else
final(2, lbufp+strlen(lbufp), cnt, buf[2], 0x10);
cnt++;
}
}
else if((buf[2] & 0x03) == 0x01)
{
/* S-frame */
if(buf[2] == 0x01)
strcpy(buffer, "RR (Receiver Ready)");
else if(buf[2] == 0x05)
strcpy(buffer, "RNR (Receiver Not Ready)");
else if(buf[2] == 0x09)
strcpy(buffer, "REJ (Reject)");
else
strcpy(buffer, "Unknown");
sprintline(2, lbufp+strlen(lbufp), cnt, buf[2], 0xff, "S-Frame: %s", buffer);
cnt++;
sprintline(2, lbufp+strlen(lbufp), cnt, buf[3], 0xfe, "N(R) = %d (receive sequence number)", (buf[3] >> 1) & 0x7f);
if(cmd)
poll(2, lbufp+strlen(lbufp), cnt, buf[3], 0x01);
else
final(2, lbufp+strlen(lbufp), cnt, buf[3], 0x01);
cnt++;
}
else if((buf[2] & 0x01) == 0x00)
{
/* I-frame */
sprintline(2, lbufp+strlen(lbufp), cnt, buf[2], 0xfe, "N(S) = %d (send sequence number)", (buf[2] >> 1) & 0x7f);
sprintline(2, lbufp+strlen(lbufp), cnt, buf[2], 0x01, "I-Frame: Information transfer");
cnt++;
sprintf(buffer, "N(R) = %d", (buf[3] >> 1) & 0x7f);
sprintline(2, lbufp+strlen(lbufp), cnt, buf[3], 0xfe, "N(R) = %d (receive sequence number)", (buf[3] >> 1) & 0x7f);
poll(2, lbufp+strlen(lbufp), cnt, buf[3], 0x01);
cnt++;
}
sprintf((pbuf+strlen(pbuf)),"%s", &locbuf[0]);
return (cnt);
}
/* EOF */
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