2 * Copyright (c) 1996 Gary Jennejohn. All rights reserved.
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
7 * 1. Redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution.
12 * 3. Neither the name of the author nor the names of any co-contributors
13 * may be used to endorse or promote products derived from this software
14 * without specific prior written permission.
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
28 *---------------------------------------------------------------------------*
30 * q.921.c - print Q.921 traces
31 * ----------------------------
33 * $Id: q921.c,v 1.4 1999/12/13 21:25:26 hm Exp $
37 * last edit-date: [Mon Dec 13 21:56:46 1999]
39 *---------------------------------------------------------------------------*/
43 /*---------------------------------------------------------------------------*
44 * decode LAPD (Q.921) protocol
45 *---------------------------------------------------------------------------*/
47 decode_lapd(char *pbuf, int n, unsigned char *buf, int dir, int raw, int printit)
49 int sap, tei, cmd, p_f;
53 char *lbufp = &locbuf[0];
58 sap = (buf[0] >> 2) & 0x3f;
71 /* SAPI control procedures */
75 sprintf((lbufp+strlen(lbufp)), "Q921: SAP=%d (Call Control), %c, TEI=%d, ", sap, cmd?'C':'R', tei);
77 if((buf[2] & 0x01) == 0)
80 sprintf((lbufp+strlen(lbufp)), "I-Frame: ");
85 sprintf((lbufp+strlen(lbufp)), "N(S) %d N(R) %d P %d ", buf [2] >> 1, buf [3] >> 1, p_f);
89 else if((buf[2] & 0x03) == 0x01)
92 sprintf((lbufp+strlen(lbufp)), "S-Frame: ");
100 sprintf((lbufp+strlen(lbufp)), "RR N(R) %d PF %d ", buf [3] >> 1, p_f);
102 sprintf((lbufp+strlen(lbufp)), "RNR N(R) %d PF %d ", buf [3] >> 1, p_f);
104 sprintf((lbufp+strlen(lbufp)), "REJ N(R) %d PF %d ", buf [3] >> 1, p_f);
108 else if((buf[2] & 0x03) == 0x03)
111 sprintf((lbufp+strlen(lbufp)), "U-Frame: ");
113 p_f = (buf [2] & 0x10) >> 4;
114 cmd = buf [2] & 0xec;
119 sprintf((lbufp+strlen(lbufp)), "SABME PF %d ", p_f);
121 sprintf((lbufp+strlen(lbufp)), "DM PF %d ", p_f);
123 sprintf((lbufp+strlen(lbufp)), "UI PF %d ", p_f);
125 sprintf((lbufp+strlen(lbufp)), "DISC PF %d ", p_f);
127 sprintf((lbufp+strlen(lbufp)), "UA PF %d ", p_f);
129 sprintf((lbufp+strlen(lbufp)), "FRMR PF %d ", p_f);
131 sprintf((lbufp+strlen(lbufp)), "XID PF %d ", p_f);
132 /* information field ??? */
143 sprintf((lbufp+strlen(lbufp)), "Q921: SAP=%d (X.25), %c, TEI=%d, ", sap, cmd?'C':'R', tei);
151 sprintf((lbufp+strlen(lbufp)), "Q921: SAP=%d (Loopbacktest), %c, TEI=%d, ", sap, cmd?'C':'R', tei);
155 /* SAPI layer 2 management functions */
160 sprintf((lbufp+strlen(lbufp)), "Q921: SAP=%d (TEI-Management), %c, TEI=%d, ", sap, cmd?'C':'R', tei);
165 sprintf((lbufp+strlen(lbufp)), "ILLEGAL TEI\n");
170 if (buf [2] != 3 && buf [3] != 0xf)
173 sprintf((lbufp+strlen(lbufp)), "invalid format!\n");
177 cnt+= 2; /* UI + MEI */
180 sprintf((lbufp+strlen(lbufp)), "Ri=0x%04hx, ", *(short *)&buf[4]);
187 sprintf((lbufp+strlen(lbufp)), "IdRequest, Ai=%d", (buf [7] >> 1));
192 sprintf((lbufp+strlen(lbufp)), "IdAssign, Ai=%d", (buf [7] >> 1));
197 sprintf((lbufp+strlen(lbufp)), "IdDenied, Ai=%d", (buf [7] >> 1));
202 sprintf((lbufp+strlen(lbufp)), "IdCheckReq, Ai=%d", (buf [7] >> 1));
207 sprintf((lbufp+strlen(lbufp)), "IdCheckResp, Ai=%d", (buf [7] >> 1));
212 sprintf((lbufp+strlen(lbufp)), "IdRemove, Ai=%d", (buf [7] >> 1));
217 sprintf((lbufp+strlen(lbufp)), "IdVerify, Ai=%d", (buf [7] >> 1));
222 sprintf((lbufp+strlen(lbufp)), "Unknown Msg Type\n");
233 sprintf((lbufp+strlen(lbufp)), "Q921: ERROR, SAP=%d (Illegal SAPI), %c, TEI=%d\n", sap, cmd?'C':'R', tei);
240 sprintf((lbufp+strlen(lbufp)), "\n");
245 for (i = 0; i < cnt; i += 16)
247 sprintf((pbuf+strlen(pbuf)),"Dump:%.3d ", i);
248 for (j = 0; j < 16; j++)
250 sprintf((pbuf+strlen(pbuf)),"%02x ", buf[i + j]);
252 sprintf((pbuf+strlen(pbuf))," ");
253 sprintf((pbuf+strlen(pbuf))," ");
254 for (j = 0; j < 16 && i + j < cnt; j++)
255 if (isprint(buf[i + j]))
256 sprintf((pbuf+strlen(pbuf)),"%c", buf[i + j]);
258 sprintf((pbuf+strlen(pbuf)),".");
259 sprintf((pbuf+strlen(pbuf)),"\n");
263 sprintf((pbuf+strlen(pbuf)),"%s", &locbuf[0]);