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

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8.9 KiB
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/*
* Copyright (c) 1997, 1999 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 1.5 1999/12/13 21:25:25 hm Exp $
*
* $FreeBSD$
*
* last edit-date: [Mon Dec 13 21:50:41 1999]
*
*---------------------------------------------------------------------------*/
#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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