GCC Code Coverage Report
Directory: ./ Exec Total Coverage
File: usr.sbin/tcpdump/print-llc.c Lines: 0 98 0.0 %
Date: 2017-11-13 Branches: 0 70 0.0 %

Line Branch Exec Source
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/*	$OpenBSD: print-llc.c,v 1.20 2015/11/16 00:16:39 mmcc Exp $	*/
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/*
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 * Copyright (c) 1992, 1993, 1994, 1995, 1996, 1997
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 *	The Regents of the University of California.  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: (1) source code distributions
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 * retain the above copyright notice and this paragraph in its entirety, (2)
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 * distributions including binary code include the above copyright notice and
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 * this paragraph in its entirety in the documentation or other materials
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 * provided with the distribution, and (3) all advertising materials mentioning
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 * features or use of this software display the following acknowledgement:
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 * ``This product includes software developed by the University of California,
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 * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
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 * the University nor the names of its contributors may be used to endorse
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 * or promote products derived from this software without specific prior
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 * written permission.
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 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
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 * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
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 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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 *
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 * Code by Matt Thomas, Digital Equipment Corporation
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 *	with an awful lot of hacking by Jeffrey Mogul, DECWRL
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 */
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#include <sys/time.h>
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#include <netinet/in.h>
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#include <ctype.h>
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#include <netdb.h>
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#include <signal.h>
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#include <stdio.h>
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#include <string.h>
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#include "interface.h"
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#include "addrtoname.h"
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#include "extract.h"			/* must come after interface.h */
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#include "ethertype.h"
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#include "llc.h"
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static struct tok cmd2str[] = {
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	{ LLC_UI,	"ui" },
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	{ LLC_TEST,	"test" },
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	{ LLC_XID,	"xid" },
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	{ LLC_UA,	"ua" },
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	{ LLC_DISC,	"disc" },
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	{ LLC_DM,	"dm" },
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	{ LLC_SABME,	"sabme" },
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	{ LLC_FRMR,	"frmr" },
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	{ 0,		NULL }
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};
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/*
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 * Returns non-zero IFF it succeeds in printing the header
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 */
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int
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llc_print(const u_char *p, u_int length, u_int caplen,
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	  const u_char *esrc, const u_char *edst)
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{
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	struct llc llc;
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	u_short et;
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#if 0
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	u_short control;
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#endif
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	int ret;
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	if (caplen < 3) {
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		(void)printf("[|llc]");
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		default_print((u_char *)p, caplen);
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		return(0);
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	}
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	/* Watch out for possible alignment problems */
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	memcpy((char *)&llc, (char *)p, min(caplen, sizeof(llc)));
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	if (llc.ssap == LLCSAP_GLOBAL && llc.dsap == LLCSAP_GLOBAL) {
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		ipx_print(p, length);
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		return (1);
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	}
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#ifdef notyet
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	else if (p[0] == 0xf0 && p[1] == 0xf0)
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		netbios_print(p, length);
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#endif
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	if (llc.ssap == LLCSAP_ISONS && llc.dsap == LLCSAP_ISONS
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	    && llc.llcui == LLC_UI) {
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		isoclns_print(p + 3, length - 3, caplen - 3, esrc, edst);
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		return (1);
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	}
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	if (llc.ssap == LLCSAP_SNAP && llc.dsap == LLCSAP_SNAP
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	    && llc.llcui == LLC_UI) {
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		if (caplen < sizeof(llc)) {
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		    (void)printf("[|llc-snap]");
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		    default_print((u_char *)p, caplen);
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		    return (0);
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		}
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		/* Cisco Discovery Protocol  - SNAP & ether type 0x2000 */
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		if (llc.ethertype[0] == 0x20 && llc.ethertype[1] == 0x00) {
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			cdp_print(p, length, caplen, esrc, edst);
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			return (1);
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		}
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		/* Shared Spanning Tree Protocol - SNAP & ether type 0x010b */
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		if (llc.ethertype[0] == 0x01 && llc.ethertype[1] == 0x0b) {
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			stp_print(p, length);
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			return (1);
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		}
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		if (vflag)
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			(void)printf("snap %s ", protoid_string(llc.llcpi));
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		caplen -= sizeof(llc);
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		length -= sizeof(llc);
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		p += sizeof(llc);
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		/* This is an encapsulated Ethernet packet */
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		et = EXTRACT_16BITS(&llc.ethertype[0]);
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		/*
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		 * Some protocols have special handling if they are 802.3
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		 * SNAP encapsulated vs vers II encapsulated. Handle
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		 * those special protocols here, and hand the rest to
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		 * print-ether.c so we don't have to duplicate
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		 * all that code here.
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		 */
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		switch (et) {
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		case ETHERTYPE_ATALK:
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			atalk_print(p, length);
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			ret = 1;
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			break;
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		default:
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			ret = ether_encap_print(et, p, length, caplen);
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			break;
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		}
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		if (ret)
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			return (ret);
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	}
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	if (llc.ssap == LLCSAP_8021D && llc.dsap == LLCSAP_8021D) {
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		stp_print(p, length);
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		return (1);
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	}
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#if 0
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	if (llc.ssap == 0xf0 && llc.dsap == 0xf0) {
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		/*
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		 * we don't actually have a full netbeui parser yet, but the
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		 * smb parser can handle many smb-in-netbeui packets, which
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		 * is very useful, so we call that
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		 */
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		/*
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		 * Skip the DSAP and LSAP.
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		 */
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		p += 2;
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		length -= 2;
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		caplen -= 2;
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		/*
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		 * OK, what type of LLC frame is this?  The length
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		 * of the control field depends on that - S or I
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		 * frames have a two-byte control field, and U frames
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		 * have a one-byte control field.
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		 */
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		if ((llc.llcu & LLC_U_FMT) == LLC_U_FMT) {
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			control = llc.llcu;
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			p += 1;
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			length -= 1;
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			caplen -= 1;
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		} else {
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			control = llc.llcis;
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			p += 2;
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			length -= 2;
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			caplen -= 2;
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		}
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		netbeui_print(control, p, p + min(caplen, length));
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		return (1);
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	}
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#endif
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	if ((llc.ssap & ~LLC_GSAP) == llc.dsap) {
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		if (eflag)
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			(void)printf("%s ", llcsap_string(llc.dsap));
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		else
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			(void)printf("%s > %s %s ",
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					etheraddr_string(esrc),
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					etheraddr_string(edst),
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					llcsap_string(llc.dsap));
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	} else {
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		if (eflag)
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			(void)printf("%s > %s ",
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				llcsap_string(llc.ssap & ~LLC_GSAP),
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				llcsap_string(llc.dsap));
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		else
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			(void)printf("%s %s > %s %s ",
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				etheraddr_string(esrc),
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				llcsap_string(llc.ssap & ~LLC_GSAP),
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				etheraddr_string(edst),
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				llcsap_string(llc.dsap));
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	}
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	if ((llc.llcu & LLC_U_FMT) == LLC_U_FMT) {
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		const char *m;
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		char f;
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		m = tok2str(cmd2str, "%02x", LLC_U_CMD(llc.llcu));
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		switch ((llc.ssap & LLC_GSAP) | (llc.llcu & LLC_U_POLL)) {
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		    case 0:			f = 'C'; break;
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		    case LLC_GSAP:		f = 'R'; break;
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		    case LLC_U_POLL:		f = 'P'; break;
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		    case LLC_GSAP|LLC_U_POLL:	f = 'F'; break;
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		    default:			f = '?'; break;
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		}
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		printf("%s/%c", m, f);
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		if (caplen < 6) {
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			default_print_unaligned(p, caplen);
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			return (0);
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		}
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		p += 3;
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		length -= 3;
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		caplen -= 3;
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		if ((llc.llcu & ~LLC_U_POLL) == LLC_XID) {
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		    if (*p == LLC_XID_FI) {
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			printf(": %02x %02x", p[1], p[2]);
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			p += 3;
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			length -= 3;
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			caplen -= 3;
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		    }
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		}
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#if 0
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		if (!strcmp(m,"ui") && f=='C') {
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			/*
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			 * we don't have a proper ipx decoder yet, but there
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			 * is a partial one in the smb code
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			 */
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			ipx_netbios_print(p,p+min(caplen,length));
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		}
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#endif
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	} else {
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		char f;
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		if (caplen < 4) {
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			default_print_unaligned(p, caplen);
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			return (0);
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		}
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		llc.llcis = ntohs(llc.llcis);
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		switch ((llc.ssap & LLC_GSAP) | (llc.llcu & LLC_U_POLL)) {
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		    case 0:			f = 'C'; break;
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		    case LLC_GSAP:		f = 'R'; break;
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		    case LLC_U_POLL:		f = 'P'; break;
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		    case LLC_GSAP|LLC_U_POLL:	f = 'F'; break;
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		    default:			f = '?'; break;
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		}
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		if ((llc.llcu & LLC_S_FMT) == LLC_S_FMT) {
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			static char *llc_s[] = { "rr", "rej", "rnr", "03" };
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			(void)printf("%s (r=%d,%c)",
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				llc_s[LLC_S_CMD(llc.llcis)],
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				LLC_IS_NR(llc.llcis),
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				f);
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		} else {
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			(void)printf("I (s=%d,r=%d,%c)",
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				LLC_I_NS(llc.llcis),
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				LLC_IS_NR(llc.llcis),
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				f);
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		}
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		p += 4;
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		length -= 4;
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		caplen -= 4;
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	}
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	(void)printf(" len=%d", length);
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	return(1);
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}