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privilege separated tcpdump, joint work with otto@

tested by avsm@ vincent@ dhartmei@ markus@ hshoexer@ and others
go for it deraadt@

/*	$OpenBSD: interface.h,v 1.43 2004/01/28 19:44:55 canacar Exp $	*/

/*
 * Copyright (c) 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997
 *	The Regents of the University of California.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that: (1) source code distributions
 * retain the above copyright notice and this paragraph in its entirety, (2)
 * distributions including binary code include the above copyright notice and
 * this paragraph in its entirety in the documentation or other materials
 * provided with the distribution, and (3) all advertising materials mentioning
 * features or use of this software display the following acknowledgement:
 * ``This product includes software developed by the University of California,
 * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
 * the University nor the names of its contributors may be used to endorse
 * or promote products derived from this software without specific prior
 * written permission.
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
 * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
 *
 * @(#) $Header: /cvsrepo/anoncvs/cvs/src/usr.sbin/tcpdump/interface.h,v 1.43 2004/01/28 19:44:55 canacar Exp $ (LBL)
 */

#ifndef tcpdump_interface_h
#define tcpdump_interface_h

#include "gnuc.h"
#ifdef HAVE_OS_PROTO_H
#include "os-proto.h"
#endif

struct tok {
	int v;			/* value */
	char *s;		/* string */
};

extern int aflag;		/* translate network and broadcast addresses */
extern int dflag;		/* print filter code */
extern int eflag;		/* print ethernet header */
extern int fflag;		/* don't translate "foreign" IP address */
extern int nflag;		/* leave addresses as numbers */
extern int Nflag;		/* remove domains from printed host names */
extern int oflag;		/* OS fingerprint */
extern int qflag;		/* quick (shorter) output */
extern int Sflag;		/* print raw TCP sequence numbers */
extern int tflag;		/* print packet arrival time */
extern int vflag;		/* verbose */
extern int xflag;		/* print packet in hex */
extern int Xflag;		/* print packet in hex/ascii */

extern int packettype;		/* as specified by -T */
#define PT_VAT		1	/* Visual Audio Tool */
#define PT_WB		2	/* distributed White Board */
#define PT_RPC		3	/* Remote Procedure Call */
#define PT_RTP		4	/* Real-Time Applications protocol */
#define PT_RTCP		5	/* Real-Time Applications control protocol */
#define PT_CNFP		6	/* Cisco NetFlow protocol */

#ifndef min
#define min(a,b) ((a)>(b)?(b):(a))
#endif
#ifndef max
#define max(a,b) ((b)>(a)?(b):(a))
#endif

#ifndef INET6
/*
 * The default snapshot length.  This value allows most printers to print
 * useful information while keeping the amount of unwanted data down.
 * In particular, it allows for an ethernet header, tcp/ip header, and
 * 14 bytes of data (assuming no ip options).
 */
#define DEFAULT_SNAPLEN 68
#else
#define DEFAULT_SNAPLEN 96
#endif /* INET6 */
#define SACK_SNAPLEN 94

#ifndef BIG_ENDIAN
#define BIG_ENDIAN 4321
#define LITTLE_ENDIAN 1234
#endif

#ifdef ETHER_HEADER_HAS_EA
#define ESRC(ep) ((ep)->ether_shost.ether_addr_octet)
#define EDST(ep) ((ep)->ether_dhost.ether_addr_octet)
#else
#define ESRC(ep) ((ep)->ether_shost)
#define EDST(ep) ((ep)->ether_dhost)
#endif

#ifdef ETHER_ARP_HAS_X
#define SHA(ap) ((ap)->arp_xsha)
#define THA(ap) ((ap)->arp_xtha)
#define SPA(ap) ((ap)->arp_xspa)
#define TPA(ap) ((ap)->arp_xtpa)
#else
#ifdef ETHER_ARP_HAS_EA
#define SHA(ap) ((ap)->arp_sha.ether_addr_octet)
#define THA(ap) ((ap)->arp_tha.ether_addr_octet)
#else
#define SHA(ap) ((ap)->arp_sha)
#define THA(ap) ((ap)->arp_tha)
#endif
#define SPA(ap) ((ap)->arp_spa)
#define TPA(ap) ((ap)->arp_tpa)
#endif

#ifndef NTOHL
#define NTOHL(x)	(x) = ntohl(x)
#define NTOHS(x)	(x) = ntohs(x)
#define HTONL(x)	(x) = htonl(x)
#define HTONS(x)	(x) = htons(x)
#endif
#endif

extern char *program_name;	/* used to generate self-identifying messages */

extern int32_t thiszone;	/* seconds offset from gmt to local time */

extern int snaplen;
/* global pointers to beginning and end of current packet (during printing) */
extern const u_char *packetp;
extern const u_char *snapend;

/*
 * True if  "l" bytes of "var" were captured.
 *
 * The "snapend - (l) <= snapend" checks to make sure "l" isn't so large
 * that "snapend - (l)" underflows.
 *
 * The check is for <= rather than < because "l" might be 0.
 */
#define TTEST2(var, l) (snapend - (l) <= snapend && \
			(const u_char *)&(var) <= snapend - (l))

/* True if "var" was captured */
#define TTEST(var) TTEST2(var, sizeof(var))

/* Bail if "l" bytes of "var" were not captured */
#define TCHECK2(var, l) if (!TTEST2(var, l)) goto trunc

/* Bail if "var" was not captured */
#define TCHECK(var) TCHECK2(var, sizeof(var))

struct timeval;
struct bpf_timeval;

extern void ts_print(const struct bpf_timeval *);

extern int fn_print(const u_char *, const u_char *);
extern int fn_printn(const u_char *, u_int, const u_char *);
extern void relts_print(int);
extern const char *tok2str(const struct tok *, const char *, int);
extern char *dnaddr_string(u_short);
extern void safeputs(const char *);
extern void safeputchar(int);

extern void wrapup(int);

extern __dead void error(const char *, ...)
    __attribute__((volatile, format (printf, 1, 2)));
extern void warning(const char *, ...) __attribute__ ((format (printf, 1, 2)));

extern char *read_infile(char *);
extern char *copy_argv(char * const *);

extern char *isonsap_string(const u_char *);
extern char *llcsap_string(u_char);
extern char *protoid_string(const u_char *);
extern char *dnname_string(u_short);
extern char *dnnum_string(u_short);

/* The printer routines. */

struct pcap_pkthdr;

extern int ether_encap_print(u_short, const u_char *, u_int, u_int);
extern int llc_print(const u_char *, u_int, u_int, const u_char *,
	const u_char *);
extern int pppoe_if_print(u_short, const u_char *, u_int, u_int);
extern void aarp_print(const u_char *, u_int);
extern void arp_print(const u_char *, u_int, u_int);
extern void atalk_print(const u_char *, u_int);
extern void atalk_print_llap(const u_char *, u_int);
extern void atm_if_print(u_char *, const struct pcap_pkthdr *, const u_char *);
extern void bootp_print(const u_char *, u_int, u_short, u_short);
extern void bgp_print(const u_char *, int);
extern void decnet_print(const u_char *, u_int, u_int);
extern void default_print(const u_char *, u_int);
extern void default_print_unaligned(const u_char *, u_int);
extern void dvmrp_print(const u_char *, u_int);
extern void egp_print(const u_char *, u_int, const u_char *);
extern void enc_if_print(u_char *, const struct pcap_pkthdr *, const u_char *);
extern void pflog_if_print(u_char *, const struct pcap_pkthdr *,
        const u_char *);
extern void pflog_old_if_print(u_char *, const struct pcap_pkthdr *,
        const u_char *);
extern void pfsync_if_print(u_char *, const struct pcap_pkthdr *,
        const u_char *);
extern void pfsync_ip_print(const u_char *, u_int, const u_char *);
extern void ether_if_print(u_char *, const struct pcap_pkthdr *,
	const u_char *);
extern void fddi_if_print(u_char *, const struct pcap_pkthdr *, const u_char *);
extern void gre_print(const u_char *, u_int);
extern void icmp_print(const u_char *, const u_char *);
extern void igrp_print(const u_char *, u_int, const u_char *);
extern void ip_print(const u_char *, u_int);
extern void ipx_print(const u_char *, u_int);
extern void isoclns_print(const u_char *, u_int, u_int, const u_char *,
	const u_char *);
extern void krb_print(const u_char *, u_int);
extern void netbeui_print(u_short, const u_char *, const u_char *);
extern void ipx_netbios_print(const u_char *, const u_char *);
extern void nbt_tcp_print(const u_char *, int);
extern void nbt_udp137_print(const u_char *data, int);
extern void nbt_udp138_print(const u_char *data, int);
extern char *smb_errstr(int, int);
extern void print_data(const unsigned char *, int);
extern void l2tp_print(const u_char *dat, u_int length);
extern void vrrp_print(const u_char *bp, u_int len, int ttl);
extern void hsrp_print(const u_char *, u_int);
extern void nfsreply_print(const u_char *, u_int, const u_char *);
extern void nfsreq_print(const u_char *, u_int, const u_char *);
extern void ns_print(const u_char *, u_int, int);
extern void ntp_print(const u_char *, u_int);
extern void loop_if_print(u_char *, const struct pcap_pkthdr *, const u_char *);
extern void null_if_print(u_char *, const struct pcap_pkthdr *, const u_char *);
extern void ospf_print(const u_char *, u_int, const u_char *);
extern void mobile_print(const u_char *, u_int);
extern void pim_print(const u_char *, u_int);
extern void ppp_if_print(u_char *, const struct pcap_pkthdr *, const u_char *);
extern void ppp_hdlc_print(const u_char *, int);
extern void raw_if_print(u_char *, const struct pcap_pkthdr *, const u_char *);
extern void rip_print(const u_char *, u_int);
extern void sl_if_print(u_char *, const struct pcap_pkthdr *, const u_char *);
extern void sl_bsdos_if_print(u_char *, const struct pcap_pkthdr *,
    const u_char *);
extern void snmp_print(const u_char *, u_int);
extern void sunrpcrequest_print(const u_char *, u_int, const u_char *);
extern void cnfp_print(const u_char *, u_int, const u_char *);
extern void tcp_print(const u_char *, u_int, const u_char *);
extern void tftp_print(const u_char *, u_int);
extern void timed_print(const u_char *, u_int);
extern void udp_print(const u_char *, u_int, const u_char *);
extern void wb_print(const void *, u_int);
extern void ike_print(const u_char *, u_int);
extern void udpencap_print(const u_char *, u_int, const u_char *);
extern void ah_print(const u_char *, u_int, const u_char *);
extern void esp_print(const u_char *, u_int, const u_char *);
extern void cdp_print(const u_char *, u_int, u_int, const u_char *,
	const u_char *);
extern void stp_print(const u_char *, u_int);
extern void radius_print(const u_char *, u_int);
extern void lwres_print(const u_char *, u_int);
extern void ether_print(const u_char *, u_int);
extern void etherip_print(const u_char *, u_int, const u_char *);
extern void ipcomp_print(const u_char *, u_int, const u_char *);

#ifdef INET6
extern void ip6_print(const u_char *, int);
extern void ip6_opt_print(const u_char *, int);
extern int hbhopt_print(const u_char *);
extern int dstopt_print(const u_char *);
extern int frag6_print(const u_char *, const u_char *);
extern void icmp6_print(const u_char *, const u_char *);
extern void ripng_print(const u_char *, int);
extern int rt6_print(const u_char *, const u_char *);
extern void ospf6_print(const u_char *, u_int);
extern void dhcp6_print(const u_char *, u_int, u_short, u_short);
#endif /*INET6*/

extern u_short in_cksum(const u_short *addr, register int len, u_short csum);