276 lines
7.2 KiB
C
276 lines
7.2 KiB
C
/*
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* Copyright (c) 1996 Gary Jennejohn. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the author nor the names of any co-contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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*---------------------------------------------------------------------------*
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*
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* q.921.c - print Q.921 traces
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* ----------------------------
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*
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* $Id: q921.c,v 1.3 1999/02/14 09:44:58 hm Exp $
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*
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* last edit-date: [Thu Apr 16 15:38:34 1998]
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*
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* -hm splitting
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* -hm printing to buffer
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* -hm slightly reformatted TEI management proc output
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* -hm minor fixes
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* -hm fixing response/command
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* -hm fixing count off by one
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* -hm dump only Q.921 part of frame
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* -hm cleanup
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*
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*---------------------------------------------------------------------------*/
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#include "trace.h"
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/*---------------------------------------------------------------------------*
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* decode LAPD (Q.921) protocol
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*---------------------------------------------------------------------------*/
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int
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decode_lapd(char *pbuf, int n, unsigned char *buf, int dir, int raw, int printit)
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{
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int sap, tei, cmd, p_f;
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int cnt = 0;
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int i;
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char locbuf[32000];
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char *lbufp = &locbuf[0];
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*lbufp = '\0';
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*pbuf = '\0';
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sap = (buf[0] >> 2) & 0x3f;
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cnt++;
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tei = buf[1] >> 1;
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cnt++;
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if(dir == FROM_TE)
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cmd = !(buf[0] & 2);
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else
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cmd = buf[0] & 2;
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switch (sap)
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{
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/* SAPI control procedures */
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case 0:
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{
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if(printit)
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sprintf((lbufp+strlen(lbufp)), "Q921: SAP=%d (Call Control), %c, TEI=%d, ", sap, cmd?'C':'R', tei);
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if((buf[2] & 0x01) == 0)
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{
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if(printit)
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sprintf((lbufp+strlen(lbufp)), "I-Frame: ");
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p_f = buf [3] & 1;
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if(printit)
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sprintf((lbufp+strlen(lbufp)), "N(S) %d N(R) %d P %d ", buf [2] >> 1, buf [3] >> 1, p_f);
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cnt += 2;
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}
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else if((buf[2] & 0x03) == 0x01)
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{
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if(printit)
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sprintf((lbufp+strlen(lbufp)), "S-Frame: ");
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p_f = buf [3] & 1;
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cmd = buf [2] & 0x0c;
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if(printit)
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{
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if (cmd == 0)
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sprintf((lbufp+strlen(lbufp)), "RR N(R) %d PF %d ", buf [3] >> 1, p_f);
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if (cmd == 4)
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sprintf((lbufp+strlen(lbufp)), "RNR N(R) %d PF %d ", buf [3] >> 1, p_f);
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if (cmd == 8)
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sprintf((lbufp+strlen(lbufp)), "REJ N(R) %d PF %d ", buf [3] >> 1, p_f);
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}
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cnt += 2;
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}
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else if((buf[2] & 0x03) == 0x03)
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{
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if(printit)
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sprintf((lbufp+strlen(lbufp)), "U-Frame: ");
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p_f = (buf [2] & 0x10) >> 4;
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cmd = buf [2] & 0xec;
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if(printit)
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{
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if (cmd == 0x6c)
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sprintf((lbufp+strlen(lbufp)), "SABME PF %d ", p_f);
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if (cmd == 0x0c)
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sprintf((lbufp+strlen(lbufp)), "DM PF %d ", p_f);
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if (cmd == 0)
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sprintf((lbufp+strlen(lbufp)), "UI PF %d ", p_f);
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if (cmd == 0x40)
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sprintf((lbufp+strlen(lbufp)), "DISC PF %d ", p_f);
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if (cmd == 0x60)
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sprintf((lbufp+strlen(lbufp)), "UA PF %d ", p_f);
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if (cmd == 0x84)
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sprintf((lbufp+strlen(lbufp)), "FRMR PF %d ", p_f);
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if (cmd == 0xac)
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sprintf((lbufp+strlen(lbufp)), "XID PF %d ", p_f);
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/* information field ??? */
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}
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cnt++;
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}
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break;
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}
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/* D channel X.25 */
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case 16:
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if(printit)
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sprintf((lbufp+strlen(lbufp)), "Q921: SAP=%d (X.25), %c, TEI=%d, ", sap, cmd?'C':'R', tei);
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cnt = n;
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goto dump;
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/* Loopback test */
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case 32:
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if(printit)
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sprintf((lbufp+strlen(lbufp)), "Q921: SAP=%d (Loopbacktest), %c, TEI=%d, ", sap, cmd?'C':'R', tei);
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cnt = n;
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goto dump;
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/* SAPI layer 2 management functions */
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case 63:
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{
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if(printit)
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sprintf((lbufp+strlen(lbufp)), "Q921: SAP=%d (TEI-Management), %c, TEI=%d, ", sap, cmd?'C':'R', tei);
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if (tei != 127)
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{
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if(printit)
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sprintf((lbufp+strlen(lbufp)), "ILLEGAL TEI\n");
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cnt = n;
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goto dump;
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}
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if (buf [2] != 3 && buf [3] != 0xf)
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{
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if(printit)
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sprintf((lbufp+strlen(lbufp)), "invalid format!\n");
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cnt = n;
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goto dump;
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}
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cnt+= 2; /* UI + MEI */
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if(printit)
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sprintf((lbufp+strlen(lbufp)), "Ri=0x%04hx, ", *(short *)&buf[4]);
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cnt += 2; /* Ri */
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switch (buf[6])
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{
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case 1:
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if(printit)
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sprintf((lbufp+strlen(lbufp)), "IdRequest, Ai=%d", (buf [7] >> 1));
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cnt += 2;
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break;
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case 2:
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if(printit)
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sprintf((lbufp+strlen(lbufp)), "IdAssign, Ai=%d", (buf [7] >> 1));
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cnt += 2;
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break;
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case 3:
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if(printit)
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sprintf((lbufp+strlen(lbufp)), "IdDenied, Ai=%d", (buf [7] >> 1));
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cnt += 2;
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break;
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case 4:
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if(printit)
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sprintf((lbufp+strlen(lbufp)), "IdCheckReq, Ai=%d", (buf [7] >> 1));
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cnt += 2;
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break;
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case 5:
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if(printit)
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sprintf((lbufp+strlen(lbufp)), "IdCheckResp, Ai=%d", (buf [7] >> 1));
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cnt += 2;
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break;
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case 6:
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if(printit)
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sprintf((lbufp+strlen(lbufp)), "IdRemove, Ai=%d", (buf [7] >> 1));
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cnt += 2;
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break;
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case 7:
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if(printit)
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sprintf((lbufp+strlen(lbufp)), "IdVerify, Ai=%d", (buf [7] >> 1));
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cnt += 2;
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break;
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default:
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if(printit)
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sprintf((lbufp+strlen(lbufp)), "Unknown Msg Type\n");
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cnt = n;
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goto dump;
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}
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break;
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}
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/* Illegal SAPI */
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default:
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if(printit)
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sprintf((lbufp+strlen(lbufp)), "Q921: ERROR, SAP=%d (Illegal SAPI), %c, TEI=%d\n", sap, cmd?'C':'R', tei);
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cnt = n;
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goto dump;
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}
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dump:
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if(printit)
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sprintf((lbufp+strlen(lbufp)), "\n");
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if(raw && printit)
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{
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int j;
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for (i = 0; i < cnt; i += 16)
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{
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sprintf((pbuf+strlen(pbuf)),"Dump:%.3d ", i);
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for (j = 0; j < 16; j++)
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if (i + j < cnt)
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sprintf((pbuf+strlen(pbuf)),"%02x ", buf[i + j]);
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else
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sprintf((pbuf+strlen(pbuf))," ");
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sprintf((pbuf+strlen(pbuf))," ");
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for (j = 0; j < 16 && i + j < cnt; j++)
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if (isprint(buf[i + j]))
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sprintf((pbuf+strlen(pbuf)),"%c", buf[i + j]);
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else
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sprintf((pbuf+strlen(pbuf)),".");
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sprintf((pbuf+strlen(pbuf)),"\n");
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}
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}
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sprintf((pbuf+strlen(pbuf)),"%s", &locbuf[0]);
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return (cnt);
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}
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/* EOF */
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