usr.sbin/i4b/isdntrace/q921.c

   1 /*
   2  * Copyright (c) 1996 Gary Jennejohn.  All rights reserved.
   3  *
   4  * Redistribution and use in source and binary forms, with or without
   5  * modification, are permitted provided that the following conditions
   6  * are met:
   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.
  15  *
  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
  26  * SUCH DAMAGE.
  27  *
  28  *---------------------------------------------------------------------------*
  29  *
  30  *      q.921.c - print Q.921 traces
  31  *      ----------------------------
  32  *
  33  *      $Id: q921.c,v 1.4 1999/12/13 21:25:26 hm Exp $
  34  *
  35  * $FreeBSD: src/usr.sbin/i4b/isdntrace/q921.c,v 1.6.2.1 2001/08/01 17:45:08 obrien Exp $
  36  * $DragonFly: src/usr.sbin/i4b/isdntrace/q921.c,v 1.2 2003/06/17 04:29:55 dillon Exp $
  37  *
  38  *      last edit-date: [Mon Dec 13 21:56:46 1999]
  39  *
  40  *---------------------------------------------------------------------------*/
  41
  42 #include "trace.h"
  43
  44 /*---------------------------------------------------------------------------*
  45  *      decode LAPD (Q.921) protocol
  46  *---------------------------------------------------------------------------*/
  47 int
  48 decode_lapd(char *pbuf, int n, unsigned char *buf, int dir, int raw, int printit)
  49 {
  50         int sap, tei, cmd, p_f;
  51         int cnt = 0;
  52         int i;
  53         char locbuf[32000];
  54         char *lbufp = &locbuf[0];
  55
  56         *lbufp = '\0';
  57         *pbuf = '\0';
  58
  59         sap = (buf[0] >> 2) & 0x3f;
  60         cnt++;
  61
  62         tei = buf[1] >> 1;
  63         cnt++;
  64
  65         if(dir == FROM_TE)
  66                 cmd = !(buf[0] & 2);
  67         else
  68                 cmd = buf[0] & 2;
  69
  70         switch (sap)
  71         {
  72                 /* SAPI control procedures */
  73                 case 0:
  74                 {
  75                         if(printit)
  76                                 sprintf((lbufp+strlen(lbufp)), "Q921: SAP=%d (Call Control), %c, TEI=%d, ", sap, cmd?'C':'R', tei);
  77
  78                         if((buf[2] & 0x01) == 0)
  79                         {
  80                                 if(printit)
  81                                         sprintf((lbufp+strlen(lbufp)), "I-Frame: ");
  82
  83                                 p_f = buf [3] & 1;
  84
  85                                 if(printit)
  86                                         sprintf((lbufp+strlen(lbufp)), "N(S) %d N(R) %d P %d ", buf [2] >> 1, buf [3] >> 1, p_f);
  87
  88                                 cnt += 2;
  89                         }
  90                         else if((buf[2] & 0x03) == 0x01)
  91                         {
  92                                 if(printit)
  93                                         sprintf((lbufp+strlen(lbufp)), "S-Frame: ");
  94
  95                                 p_f = buf [3] & 1;
  96                                 cmd = buf [2] & 0x0c;
  97
  98                                 if(printit)
  99                                 {
 100                                         if (cmd == 0)
 101                                                 sprintf((lbufp+strlen(lbufp)), "RR N(R) %d PF %d ", buf [3] >> 1, p_f);
 102                                         if (cmd == 4)
 103                                                 sprintf((lbufp+strlen(lbufp)), "RNR N(R) %d PF %d ", buf [3] >> 1, p_f);
 104                                         if (cmd == 8)
 105                                                 sprintf((lbufp+strlen(lbufp)), "REJ N(R) %d PF %d ", buf [3] >> 1, p_f);
 106                                 }
 107                                 cnt += 2;
 108                         }
 109                         else if((buf[2] & 0x03) == 0x03)
 110                         {
 111                                 if(printit)
 112                                         sprintf((lbufp+strlen(lbufp)), "U-Frame: ");
 113
 114                                 p_f = (buf [2] & 0x10) >> 4;
 115                                 cmd = buf [2] & 0xec;
 116
 117                                 if(printit)
 118                                 {
 119                                         if (cmd == 0x6c)
 120                                                 sprintf((lbufp+strlen(lbufp)), "SABME PF %d ", p_f);
 121                                         if (cmd == 0x0c)
 122                                                 sprintf((lbufp+strlen(lbufp)), "DM PF %d ", p_f);
 123                                         if (cmd == 0)
 124                                                 sprintf((lbufp+strlen(lbufp)), "UI PF %d ", p_f);
 125                                         if (cmd == 0x40)
 126                                                 sprintf((lbufp+strlen(lbufp)), "DISC PF %d ", p_f);
 127                                         if (cmd == 0x60)
 128                                                 sprintf((lbufp+strlen(lbufp)), "UA PF %d ", p_f);
 129                                         if (cmd == 0x84)
 130                                                 sprintf((lbufp+strlen(lbufp)), "FRMR PF %d ", p_f);
 131                                         if (cmd == 0xac)
 132                                                 sprintf((lbufp+strlen(lbufp)), "XID PF %d ", p_f);
 133                                         /* information field ??? */
 134                                 }
 135                                 cnt++;
 136                         }
 137                         break;
 138                 }
 139
 140                 /* D channel X.25 */
 141
 142                 case 16:
 143                         if(printit)
 144                                 sprintf((lbufp+strlen(lbufp)), "Q921: SAP=%d (X.25), %c, TEI=%d, ", sap, cmd?'C':'R', tei);
 145                         cnt = n;
 146                         goto dump;
 147
 148                 /* Loopback test */
 149
 150                 case 32:
 151                         if(printit)
 152                                 sprintf((lbufp+strlen(lbufp)), "Q921: SAP=%d (Loopbacktest), %c, TEI=%d, ", sap, cmd?'C':'R', tei);
 153                         cnt = n;
 154                         goto dump;
 155
 156                 /* SAPI layer 2 management functions */
 157
 158                 case 63:
 159                 {
 160                         if(printit)
 161                                 sprintf((lbufp+strlen(lbufp)), "Q921: SAP=%d (TEI-Management), %c, TEI=%d, ", sap, cmd?'C':'R', tei);
 162
 163                         if (tei != 127)
 164                         {
 165                                 if(printit)
 166                                         sprintf((lbufp+strlen(lbufp)), "ILLEGAL TEI\n");
 167                                 cnt = n;
 168                                 goto dump;
 169                         }
 170
 171                         if (buf [2] != 3 && buf [3] != 0xf)
 172                         {
 173                                 if(printit)
 174                                         sprintf((lbufp+strlen(lbufp)), "invalid format!\n");
 175                                 cnt = n;
 176                                 goto dump;
 177                         }
 178                         cnt+= 2; /* UI + MEI */
 179
 180                         if(printit)
 181                                 sprintf((lbufp+strlen(lbufp)), "Ri=0x%04hx, ", *(short *)&buf[4]);
 182                         cnt += 2; /* Ri */
 183
 184                         switch (buf[6])
 185                         {
 186                                 case 1:
 187                                         if(printit)
 188                                                 sprintf((lbufp+strlen(lbufp)), "IdRequest, Ai=%d", (buf [7] >> 1));
 189                                         cnt += 2;
 190                                         break;
 191                                 case 2:
 192                                         if(printit)
 193                                                 sprintf((lbufp+strlen(lbufp)), "IdAssign, Ai=%d", (buf [7] >> 1));
 194                                         cnt += 2;
 195                                         break;
 196                                 case 3:
 197                                         if(printit)
 198                                                 sprintf((lbufp+strlen(lbufp)), "IdDenied, Ai=%d", (buf [7] >> 1));
 199                                         cnt += 2;
 200                                         break;
 201                                 case 4:
 202                                         if(printit)
 203                                                 sprintf((lbufp+strlen(lbufp)), "IdCheckReq, Ai=%d", (buf [7] >> 1));
 204                                         cnt += 2;
 205                                         break;
 206                                 case 5:
 207                                         if(printit)
 208                                                 sprintf((lbufp+strlen(lbufp)), "IdCheckResp, Ai=%d", (buf [7] >> 1));
 209                                         cnt += 2;
 210                                         break;
 211                                 case 6:
 212                                         if(printit)
 213                                                 sprintf((lbufp+strlen(lbufp)), "IdRemove, Ai=%d", (buf [7] >> 1));
 214                                         cnt += 2;
 215                                         break;
 216                                 case 7:
 217                                         if(printit)
 218                                                 sprintf((lbufp+strlen(lbufp)), "IdVerify, Ai=%d", (buf [7] >> 1));
 219                                         cnt += 2;
 220                                         break;
 221                                 default:
 222                                         if(printit)
 223                                                 sprintf((lbufp+strlen(lbufp)), "Unknown Msg Type\n");
 224                                         cnt = n;
 225                                         goto dump;
 226                         }
 227                         break;
 228                 }
 229
 230                 /* Illegal SAPI */
 231
 232                 default:
 233                         if(printit)
 234                                 sprintf((lbufp+strlen(lbufp)), "Q921: ERROR, SAP=%d (Illegal SAPI), %c, TEI=%d\n", sap, cmd?'C':'R', tei);
 235                         cnt = n;
 236                         goto dump;
 237         }
 238
 239 dump:
 240         if(printit)
 241                 sprintf((lbufp+strlen(lbufp)), "\n");
 242
 243         if(raw && printit)
 244         {
 245                 int j;
 246                 for (i = 0; i < cnt; i += 16)
 247                 {
 248                         sprintf((pbuf+strlen(pbuf)),"Dump:%.3d  ", i);
 249                         for (j = 0; j < 16; j++)
 250                                 if (i + j < cnt)
 251                                         sprintf((pbuf+strlen(pbuf)),"%02x ", buf[i + j]);
 252                                 else
 253                                         sprintf((pbuf+strlen(pbuf)),"   ");
 254                         sprintf((pbuf+strlen(pbuf)),"      ");
 255                         for (j = 0; j < 16 && i + j < cnt; j++)
 256                                 if (isprint(buf[i + j]))
 257                                         sprintf((pbuf+strlen(pbuf)),"%c", buf[i + j]);
 258                                 else
 259                                         sprintf((pbuf+strlen(pbuf)),".");
 260                         sprintf((pbuf+strlen(pbuf)),"\n");
 261                 }
 262         }
 263
 264         sprintf((pbuf+strlen(pbuf)),"%s", &locbuf[0]);
 265
 266         return (cnt);
 267 }
 268
 269 /* EOF */