511 lines
14 KiB
C
511 lines
14 KiB
C
/*
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* Copyright (c) 1997, 1999 Hellmuth Michaelis. 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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*
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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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* layer3.c - decode and print layer 3 (Q.931) information
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* -------------------------------------------------------
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*
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* $Id: layer3.c,v 1.7 1999/12/13 21:25:25 hm Exp $
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*
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* $FreeBSD$
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*
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* last edit-date: [Mon Dec 13 21:50:48 1999]
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*
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*---------------------------------------------------------------------------*/
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#include "decode.h"
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char *mttab[] = {
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/* 0x00 */ /* call establishment group */
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"ESCAPE",
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"ALERTING",
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"CALL PROCEEDING",
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"PROGRESS",
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"undefined (0x04)",
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"SETUP",
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"undefined (0x06)",
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"CONNECT",
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"undefined (0x08)",
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"undefined (0x09)",
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"undefined (0x0a)",
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"undefined (0x0b)",
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"undefined (0x0c)",
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"SETUP ACKNOWLEDGE",
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"undefined (0x0e)",
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"CONNECT ACKNOWLEDGE",
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/* 0x10 */
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"undefined (0x10)",
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"undefined (0x11)",
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"undefined (0x12)",
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"undefined (0x13)",
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"undefined (0x14)",
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"undefined (0x15)",
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"undefined (0x16)",
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"undefined (0x17)",
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"undefined (0x18)",
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"undefined (0x19)",
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"undefined (0x1a)",
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"undefined (0x1b)",
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"undefined (0x1c)",
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"undefined (0x1d)",
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"undefined (0x1e)",
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"undefined (0x1f)",
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/* 0x20 */
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"USER INFORMATION", /* call information phase */
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"SUSPEND REJECT",
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"RESUME REJECT",
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"undefined (0x23)",
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"HOLD",
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"SUSPEND",
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"RESUME",
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"undefined (0x27)",
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"HOLD ACKNOWLEDGE",
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"undefined (0x29)",
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"undefined (0x2a)",
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"undefined (0x2b)",
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"undefined (0x2c)",
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"SUSPEND ACKNOWLEDGE",
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"RESUME ACKNOWLEDGE",
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"undefined (0x2f)",
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/* 0x30 */
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"HOLD REJECT",
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"RETRIEVE",
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"undefined (0x32)",
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"RETRIEVE ACKNOWLEDGE",
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"undefined (0x34)",
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"undefined (0x35)",
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"undefined (0x36)",
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"RETRIEVE REJECT",
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"undefined (0x38)",
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"undefined (0x39)",
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"undefined (0x3a)",
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"undefined (0x3b)",
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"undefined (0x3c)",
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"undefined (0x3d)",
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"undefined (0x3e)",
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"undefined (0x3f)",
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/* 0x40 */
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"DETACH", /* call clearing */
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"undefined (0x41)",
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"undefined (0x42)",
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"undefined (0x43)",
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"undefined (0x44)",
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"DISCONNECT",
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"RESTART",
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"undefined (0x47)",
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"DETACH ACKNOWLEDGE",
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"undefined (0x49)",
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"undefined (0x4a)",
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"undefined (0x4b)",
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"undefined (0x4c)",
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"RELEASE",
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"RESTART ACKNOWLEDGE",
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"undefined (0x4f)",
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/* 0x50 */
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"undefined (0x50)",
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"undefined (0x51)",
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"undefined (0x52)",
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"undefined (0x53)",
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"undefined (0x54)",
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"undefined (0x55)",
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"undefined (0x56)",
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"undefined (0x57)",
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"undefined (0x58)",
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"undefined (0x59)",
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"RELEASE COMPLETE",
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"undefined (0x5b)",
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"undefined (0x5c)",
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"undefined (0x5d)",
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"undefined (0x5e)",
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"undefined (0x5f)",
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/* 0x60 */
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"SEGMENT", /* misc messages */
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"undefined (0x61)",
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"FACILITY",
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"undefined (0x63)",
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"REGISTER",
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"undefined (0x65)",
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"undefined (0x66)",
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"undefined (0x67)",
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"CANCEL ACKNOWLEDGE",
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"undefined (0x69)",
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"FACILITY ACKNOWLEDGE",
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"undefined (0x6b)",
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"REGISTER ACKNOWLEDGE",
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"undefined (0x6d)",
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"NOTIFY",
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"undefined (0x6f)",
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/* 0x70 */
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"CANCEL REJECT",
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"undefined (0x71)",
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"FACILITY REJECT",
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"undefined (0x73)",
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"REGISTER REJECT",
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"STATUS ENQIRY",
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"undefined (0x76)",
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"undefined (0x77)",
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"undefined (0x78)",
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"CONGESTION CONTROL",
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"undefined (0x7a)",
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"INFORMATION",
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"undefined (0x7c)",
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"STATUS",
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"undefined (0x7e)",
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"undefined (0x7f)",
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};
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#define MTTAB_MAX 0x7f
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extern int f_null(char *pbuf, unsigned char *buf, int off);
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extern int f_bc(char *pbuf, unsigned char *buf, int off);
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extern int f_cause(char *pbuf, unsigned char *buf, int off);
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extern int f_cstat(char *pbuf, unsigned char *buf, int off);
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extern int f_chid(char *pbuf, unsigned char *buf, int off);
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extern int f_fac(char *pbuf, unsigned char *buf, int off);
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extern int f_progi(char *pbuf, unsigned char *buf, int off);
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extern int f_displ(char *pbuf, unsigned char *buf, int off);
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extern int f_date(char *pbuf, unsigned char *buf, int off);
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extern int f_cnu(char *pbuf, unsigned char *buf, int off);
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extern int f_cgpn(char *pbuf, unsigned char *buf, int off);
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extern int f_cdpn(char *pbuf, unsigned char *buf, int off);
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extern int f_hlc(char *pbuf, unsigned char *buf, int off);
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struct ie {
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unsigned char code; /* information element identifier code */
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char *name; /* ie name */
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int (*func) (char *pbuf, unsigned char *buf, int off); /* decode function */
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} ietab[] = {
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{ 0x00, "segmented message", f_null },
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{ 0x04, "bearer capability", f_bc },
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{ 0x08, "cause", f_cause },
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{ 0x0c, "connected address", f_null },
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{ 0x0d, "extended facility", f_null },
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{ 0x10, "call identity", f_null },
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{ 0x14, "call state", f_cstat },
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{ 0x18, "channel id", f_chid },
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{ 0x19, "data link connection id", f_null },
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{ 0x1c, "facility", f_fac },
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{ 0x1e, "progress indicator", f_progi },
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{ 0x20, "network specific facilities", f_null },
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{ 0x24, "terminal capabilities", f_null },
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{ 0x27, "notification indicator", f_null },
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{ 0x28, "display", f_displ },
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{ 0x29, "date/time", f_date },
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{ 0x2c, "keypad", f_null },
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{ 0x30, "keypad echo", f_null },
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{ 0x32, "information request", f_null },
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{ 0x34, "signal", f_null },
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{ 0x36, "switchhook", f_null },
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{ 0x38, "feature activation", f_null },
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{ 0x39, "feature indication", f_null },
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{ 0x3a, "service profile id", f_null },
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{ 0x3b, "endpoint identifier", f_null },
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{ 0x40, "information rate", f_null },
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{ 0x41, "precedence level", f_null },
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{ 0x42, "end-to-end transit delay", f_null },
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{ 0x43, "transit delay detection", f_null },
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{ 0x44, "packet layer binary parms", f_null },
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{ 0x45, "packet layer window size", f_null },
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{ 0x46, "packet size", f_null },
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{ 0x47, "closed user group", f_null },
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{ 0x48, "link layer core parameters", f_null },
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{ 0x49, "link layer protocol parms", f_null },
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{ 0x4a, "reverse charging information", f_null },
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{ 0x4c, "connected number", f_cnu },
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{ 0x4d, "connected subaddress", f_null },
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{ 0x50, "X.213 priority", f_null },
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{ 0x51, "report type", f_null },
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{ 0x53, "link integrity verification", f_null },
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{ 0x57, "PVC status", f_null },
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{ 0x6c, "calling party number", f_cnu },
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{ 0x6d, "calling party subaddress", f_null },
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{ 0x70, "called party number", f_cnu },
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{ 0x71, "called party subaddress", f_null },
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{ 0x74, "redirecting number", f_null },
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{ 0x78, "transit network selection", f_null },
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{ 0x79, "restart indicator", f_null },
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{ 0x7c, "low layer compatibility", f_null },
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{ 0x7d, "high layer compatibility", f_hlc },
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{ 0x7e, "user-user", f_null },
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{ 0x7f, "escape for extension", f_null },
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{ 0xff, "unknown information element", f_null }
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};
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/*---------------------------------------------------------------------------*
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* decode Q.931 protocol
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*---------------------------------------------------------------------------*/
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void
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layer3(char *pbuf, int n, int off, unsigned char *buf)
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{
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char buffer[256];
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int codeset = 0;
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int codelock = 0;
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int oldcodeset = 0;
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int pd;
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int len;
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int j;
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int i;
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if(n <= 0)
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return;
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*pbuf = '\0';
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i = 0;
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/* protocol discriminator */
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pd = buf[i];
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if(pd >= 0x00 && pd <= 0x07)
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sprintf(buffer, "User-User IE (0x%02x)",pd);
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else if(pd == 0x08)
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sprintf(buffer, "Q.931/I.451");
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else if(pd >= 0x10 && pd <= 0x3f)
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sprintf(buffer, "Other Layer 3 or X.25 (0x%02x)",pd);
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else if(pd >= 0x40 && pd <= 0x4f)
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sprintf(buffer, "National Use (0x%02x)",pd);
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else if(pd >= 0x50 && pd <= 0xfe)
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sprintf(buffer, "Other Layer 3 or X.25 (0x%02x)",pd);
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else
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sprintf(buffer, "Reserved (0x%02x)",pd);
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sprintline(3, (pbuf+strlen(pbuf)), off+i, pd, 0xff, "Protocol discriminator = %s", buffer);
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i++;
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/* call reference */
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len = buf[i] & 0x0f;
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sprintline(3, (pbuf+strlen(pbuf)), off+i, buf[i], 0xf0, "Call Reference");
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switch(len)
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{
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case 0:
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sprintline(3, (pbuf+strlen(pbuf)), off+i, buf[i], 0x0f, "Length of Call Reference = 0 (Dummy CR)");
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break;
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case 1:
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sprintline(3, (pbuf+strlen(pbuf)), off+i, buf[i], 0x0f, "Length of Call Reference = 1");
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i++;
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sprintline(3, (pbuf+strlen(pbuf)), off+i, buf[i], 0x80, "Call Reference sent %s origination side", (buf[i] & 0x80) ? "to" : "from");
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sprintline(3, (pbuf+strlen(pbuf)), off+i, buf[i], 0x7f, "Call Reference = %d = 0x%02x", (buf[i] & 0x7f), (buf[i] & 0x7f));
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break;
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case 2:
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sprintline(3, (pbuf+strlen(pbuf)), off+i, buf[i], 0x0f, "Length of Call Reference = 2");
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i++;
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sprintline(3, (pbuf+strlen(pbuf)), off+i, buf[i], 0x80, "Call Reference sent %s origination side", (buf[i] & 0x80) ? "to" : "from");
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sprintline(3, (pbuf+strlen(pbuf)), off+i, buf[i], 0x7f, "Call reference = %d = %02x", (buf[i] & 0x7f));
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i++;
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sprintline(3, (pbuf+strlen(pbuf)), off+i, buf[i], 0xff, "Call reference = %d = %02x", (buf[i]));
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break;
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}
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i++;
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/* message type */
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sprintline(3, (pbuf+strlen(pbuf)), off+i, buf[i], 0x80, "Message type extension = %d", buf[i] & 0x80 ? 1 : 0);
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if(buf[i] <= MTTAB_MAX)
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strcpy(buffer, mttab[buf[i]]);
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else
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sprintf(buffer, "unknown (0x%02x)", buf[i]);
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sprintline(3, (pbuf+strlen(pbuf)), off+i, buf[i], 0x7f, "Message type = %s", buffer);
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i++;
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/* information elements */
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for (; i < n;)
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{
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sprintline(3, (pbuf+strlen(pbuf)), off+i, buf[i], 0x80, "%s Information element", buf[i] & 0x80 ? "Single octet" : "Variable length");
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if(buf[i] & 0x80)
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{
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/* single octett info element type 1 */
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if((buf[i] & 0x70) == 0x00)
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{
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strcpy(buffer, "Reserved");
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sprintline(3, (pbuf+strlen(pbuf)), off+i, buf[i], 0x70, "Reserved");
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sprintline(3, (pbuf+strlen(pbuf)), off+i, buf[i], 0x0f, "Reserved, content of IE");
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}
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else if((buf[i] & 0x70) == 0x10)
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{
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strcpy(buffer, "Shift");
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sprintline(3, (pbuf+strlen(pbuf)), off+i, buf[i], 0x70, "Shift");
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sprintline(3, (pbuf+strlen(pbuf)), off+i, buf[i], 0x08, "%s shift", buf[i] & 0x08 ? "Non-locking" : "Locking");
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switch(buf[i] & 0x07)
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{
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case 0:
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strcpy(buffer, "Not applicable");
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break;
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case 1:
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case 2:
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case 3:
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sprintf(buffer, "Reserved (%d)", buf[i] & 0x07);
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break;
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case 4:
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strcpy(buffer, "Codeset 4 (ISO/IEC)");
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break;
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case 5:
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strcpy(buffer, "Codeset 5 (National use)");
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break;
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case 6:
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strcpy(buffer, "Codeset 6 (Local network specific)");
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break;
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case 7:
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strcpy(buffer, "Codeset 7 (User specific)");
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break;
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}
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sprintline(3, (pbuf+strlen(pbuf)), off+i, buf[i], 0x07, "%s", buffer);
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break;
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}
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else if((buf[i] & 0x70) == 0x30)
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{
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sprintline(3, (pbuf+strlen(pbuf)), off+i, buf[i], 0x70, "Congestion Level");
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switch(buf[i] & 0x0f)
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{
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case 0x00:
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strcpy(buffer, "receiver ready");
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break;
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case 0x0f:
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strcpy(buffer, "receiver not ready");
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break;
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default:
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sprintf(buffer, "reserved (0x%02x)", buf[i] & 0x0f);
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break;
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}
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sprintline(3, (pbuf+strlen(pbuf)), off+i, buf[i], 0x0f, "Congestion Level = ", buffer);
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break;
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}
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else if((buf[i] & 0x70) == 0x50)
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{
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sprintline(3, (pbuf+strlen(pbuf)), off+i, buf[i], 0x70, "Repeat Indicator");
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switch(buf[i] & 0x0f)
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{
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case 0x02:
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strcpy(buffer, "Prioritized list for selecting one possibility");
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break;
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default:
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sprintf(buffer, "reserved (0x%02x)", buf[i] & 0x0f);
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break;
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}
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sprintline(3, (pbuf+strlen(pbuf)), off+i, buf[i], 0x0f, "Repeat indication = ", buffer);
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break;
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}
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/* single octett info element type 2 */
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else if((buf[i] & 0x7f) == 0x20)
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{
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sprintline(3, (pbuf+strlen(pbuf)), off+i, buf[i], 0x7f, "More data");
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}
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else if((buf[i] & 0x7f) == 0x21)
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{
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sprintline(3, (pbuf+strlen(pbuf)), off+i, buf[i], 0x7f, "Sending complete");
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}
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else
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{
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sprintline(3, (pbuf+strlen(pbuf)), off+i, buf[i], 0xff, "UNKNOWN single octet IE = 0x%02x", buf[i]);
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}
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i++; /* next */
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}
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else
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{
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if(codeset == 0)
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{
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struct ie *iep = &ietab[0];
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for(;;)
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{
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if((iep->code == buf[i]) ||
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(iep->code == 0xff))
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break;
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iep++;
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}
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sprintline(3, (pbuf+strlen(pbuf)), off+i, buf[i], 0x7f, "IE = %s", iep->name);
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sprintline(3, pbuf+strlen(pbuf), off+i+1, buf[i+1], 0xff, "IE Length = %d", buf[i+1]);
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if(iep->func == f_null)
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{
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}
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else
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{
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i += (iep->func)(pbuf, &buf[i], off+i);
|
|
goto next;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
sprintf((pbuf+strlen(pbuf)), "UNKNOWN CODESET=%d, IE=0x%02x", codeset, buf[i]);
|
|
}
|
|
|
|
i++; /* index -> length */
|
|
|
|
len = buf[i];
|
|
|
|
sprintf((pbuf+strlen(pbuf)), "LEN=0x%02x, DATA=", len);
|
|
|
|
i++; /* index -> 1st param */
|
|
|
|
for(j = 0; j < len; j++)
|
|
{
|
|
sprintf((pbuf+strlen(pbuf)),"0x%02x ", buf[j+i]);
|
|
}
|
|
|
|
sprintf((pbuf+strlen(pbuf)),"]");
|
|
|
|
i += len;
|
|
|
|
next:
|
|
|
|
if(!codelock && (codeset != oldcodeset))
|
|
codeset = oldcodeset;
|
|
}
|
|
}
|
|
/* sprintf((pbuf+strlen(pbuf)),"\n"); */
|
|
}
|
|
|
|
/* EOF */
|
|
|