Flatten vendor/tcpdump and remove keyword expansion.

1 files changed, 0 insertions, 807 deletions

diff --git a/contrib/tcpdump/print-tcp.c b/contrib/tcpdump/print-tcp.c
deleted file mode 100644
index 11bd6b7..0000000
--- a/contrib/tcpdump/print-tcp.c
+++ /dev/null
@@ -1,807 +0,0 @@
-/*
- * Copyright (c) 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997
- *	The Regents of the University of California.  All rights reserved.
- *
- * Copyright (c) 1999-2004 The tcpdump.org project
- *
- * 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.
- */
-
-#ifndef lint
-static const char rcsid[] _U_ =
-    "@(#) $Header: /tcpdump/master/tcpdump/print-tcp.c,v 1.120.2.3 2005/10/16 06:05:46 guy Exp $ (LBL)";
-#endif
-
-#ifdef HAVE_CONFIG_H
-#include "config.h"
-#endif
-
-#include <tcpdump-stdinc.h>
-
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-
-#include "interface.h"
-#include "addrtoname.h"
-#include "extract.h"
-
-#include "tcp.h"
-
-#include "ip.h"
-#ifdef INET6
-#include "ip6.h"
-#endif
-#include "ipproto.h"
-#include "rpc_auth.h"
-#include "rpc_msg.h"
-
-#include "nameser.h"
-
-#ifdef HAVE_LIBCRYPTO
-#include <openssl/md5.h>
-
-#define SIGNATURE_VALID		0
-#define SIGNATURE_INVALID	1
-#define CANT_CHECK_SIGNATURE	2
-
-static int tcp_verify_signature(const struct ip *ip, const struct tcphdr *tp,
-    const u_char *data, int length, const u_char *rcvsig);
-#endif
-
-static void print_tcp_rst_data(register const u_char *sp, u_int length);
-
-#define MAX_RST_DATA_LEN	30
-
-
-struct tha {
-#ifndef INET6
-	struct in_addr src;
-	struct in_addr dst;
-#else
-	struct in6_addr src;
-	struct in6_addr dst;
-#endif /*INET6*/
-	u_int port;
-};
-
-struct tcp_seq_hash {
-	struct tcp_seq_hash *nxt;
-	struct tha addr;
-	tcp_seq seq;
-	tcp_seq ack;
-};
-
-#define TSEQ_HASHSIZE 919
-
-/* These tcp optinos do not have the size octet */
-#define ZEROLENOPT(o) ((o) == TCPOPT_EOL || (o) == TCPOPT_NOP)
-
-static struct tcp_seq_hash tcp_seq_hash[TSEQ_HASHSIZE];
-
-
-#ifndef TELNET_PORT
-#define TELNET_PORT	23
-#endif
-#ifndef BGP_PORT
-#define BGP_PORT	179
-#endif
-#define NETBIOS_SSN_PORT 139
-#ifndef PPTP_PORT
-#define PPTP_PORT	1723
-#endif
-#define BEEP_PORT        10288
-#ifndef NFS_PORT
-#define NFS_PORT	2049
-#endif
-#define MSDP_PORT	639
-#define LDP_PORT        646
-
-static int tcp_cksum(register const struct ip *ip,
-		     register const struct tcphdr *tp,
-		     register u_int len)
-{
-	union phu {
-		struct phdr {
-			u_int32_t src;
-			u_int32_t dst;
-			u_char mbz;
-			u_char proto;
-			u_int16_t len;
-		} ph;
-		u_int16_t pa[6];
-	} phu;
-	const u_int16_t *sp;
-
-	/* pseudo-header.. */
-	phu.ph.len = htons((u_int16_t)len);
-	phu.ph.mbz = 0;
-	phu.ph.proto = IPPROTO_TCP;
-	memcpy(&phu.ph.src, &ip->ip_src.s_addr, sizeof(u_int32_t));
-	if (IP_HL(ip) == 5)
-		memcpy(&phu.ph.dst, &ip->ip_dst.s_addr, sizeof(u_int32_t));
-	else
-		phu.ph.dst = ip_finddst(ip);
-
-	sp = &phu.pa[0];
-	return in_cksum((u_short *)tp, len,
-			sp[0]+sp[1]+sp[2]+sp[3]+sp[4]+sp[5]);
-}
-
-#ifdef INET6
-static int tcp6_cksum(const struct ip6_hdr *ip6, const struct tcphdr *tp,
-	u_int len)
-{
-	size_t i;
-	register const u_int16_t *sp;
-	u_int32_t sum;
-	union {
-		struct {
-			struct in6_addr ph_src;
-			struct in6_addr ph_dst;
-			u_int32_t	ph_len;
-			u_int8_t	ph_zero[3];
-			u_int8_t	ph_nxt;
-		} ph;
-		u_int16_t pa[20];
-	} phu;
-
-	/* pseudo-header */
-	memset(&phu, 0, sizeof(phu));
-	phu.ph.ph_src = ip6->ip6_src;
-	phu.ph.ph_dst = ip6->ip6_dst;
-	phu.ph.ph_len = htonl(len);
-	phu.ph.ph_nxt = IPPROTO_TCP;
-
-	sum = 0;
-	for (i = 0; i < sizeof(phu.pa) / sizeof(phu.pa[0]); i++)
-		sum += phu.pa[i];
-
-	sp = (const u_int16_t *)tp;
-
-	for (i = 0; i < (len & ~1); i += 2)
-		sum += *sp++;
-
-	if (len & 1)
-		sum += htons((*(const u_int8_t *)sp) << 8);
-
-	while (sum > 0xffff)
-		sum = (sum & 0xffff) + (sum >> 16);
-	sum = ~sum & 0xffff;
-
-	return (sum);
-}
-#endif
-
-void
-tcp_print(register const u_char *bp, register u_int length,
-	  register const u_char *bp2, int fragmented)
-{
-	register const struct tcphdr *tp;
-	register const struct ip *ip;
-	register u_char flags;
-	register u_int hlen;
-	register char ch;
-	u_int16_t sport, dport, win, urp;
-	u_int32_t seq, ack, thseq, thack;
-	int threv;
-#ifdef INET6
-	register const struct ip6_hdr *ip6;
-#endif
-
-	tp = (struct tcphdr *)bp;
-	ip = (struct ip *)bp2;
-#ifdef INET6
-	if (IP_V(ip) == 6)
-		ip6 = (struct ip6_hdr *)bp2;
-	else
-		ip6 = NULL;
-#endif /*INET6*/
-	ch = '\0';
-	if (!TTEST(tp->th_dport)) {
-		(void)printf("%s > %s: [|tcp]",
-			ipaddr_string(&ip->ip_src),
-			ipaddr_string(&ip->ip_dst));
-		return;
-	}
-
-	sport = EXTRACT_16BITS(&tp->th_sport);
-	dport = EXTRACT_16BITS(&tp->th_dport);
-
-	hlen = TH_OFF(tp) * 4;
-
-	/*
-	 * If data present, header length valid, and NFS port used,
-	 * assume NFS.
-	 * Pass offset of data plus 4 bytes for RPC TCP msg length
-	 * to NFS print routines.
-	 */
-	if (!qflag && hlen >= sizeof(*tp) && hlen <= length) {
-		if ((u_char *)tp + 4 + sizeof(struct sunrpc_msg) <= snapend &&
-		    dport == NFS_PORT) {
-			nfsreq_print((u_char *)tp + hlen + 4, length - hlen,
-				     (u_char *)ip);
-			return;
-		} else if ((u_char *)tp + 4 + sizeof(struct sunrpc_msg)
-			   <= snapend &&
-			   sport == NFS_PORT) {
-			nfsreply_print((u_char *)tp + hlen + 4, length - hlen,
-				       (u_char *)ip);
-			return;
-		}
-	}
-#ifdef INET6
-	if (ip6) {
-		if (ip6->ip6_nxt == IPPROTO_TCP) {
-			(void)printf("%s.%s > %s.%s: ",
-				ip6addr_string(&ip6->ip6_src),
-				tcpport_string(sport),
-				ip6addr_string(&ip6->ip6_dst),
-				tcpport_string(dport));
-		} else {
-			(void)printf("%s > %s: ",
-				tcpport_string(sport), tcpport_string(dport));
-		}
-	} else
-#endif /*INET6*/
-	{
-		if (ip->ip_p == IPPROTO_TCP) {
-			(void)printf("%s.%s > %s.%s: ",
-				ipaddr_string(&ip->ip_src),
-				tcpport_string(sport),
-				ipaddr_string(&ip->ip_dst),
-				tcpport_string(dport));
-		} else {
-			(void)printf("%s > %s: ",
-				tcpport_string(sport), tcpport_string(dport));
-		}
-	}
-
-	if (hlen < sizeof(*tp)) {
-		(void)printf(" tcp %d [bad hdr length %u - too short, < %lu]",
-		    length - hlen, hlen, (unsigned long)sizeof(*tp));
-		return;
-	}
-
-	TCHECK(*tp);
-
-	seq = EXTRACT_32BITS(&tp->th_seq);
-	ack = EXTRACT_32BITS(&tp->th_ack);
-	win = EXTRACT_16BITS(&tp->th_win);
-	urp = EXTRACT_16BITS(&tp->th_urp);
-
-	if (qflag) {
-		(void)printf("tcp %d", length - hlen);
-		if (hlen > length) {
-			(void)printf(" [bad hdr length %u - too long, > %u]",
-			    hlen, length);
-		}
-		return;
-	}
-	if ((flags = tp->th_flags) & (TH_SYN|TH_FIN|TH_RST|TH_PUSH|
-				      TH_ECNECHO|TH_CWR)) {
-		if (flags & TH_SYN)
-			putchar('S');
-		if (flags & TH_FIN)
-			putchar('F');
-		if (flags & TH_RST)
-			putchar('R');
-		if (flags & TH_PUSH)
-			putchar('P');
-		if (flags & TH_CWR)
-			putchar('W');	/* congestion _W_indow reduced (ECN) */
-		if (flags & TH_ECNECHO)
-			putchar('E');	/* ecn _E_cho sent (ECN) */
-	} else
-		putchar('.');
-
-	if (!Sflag && (flags & TH_ACK)) {
-		register struct tcp_seq_hash *th;
-		const void *src, *dst;
-		register int rev;
-		struct tha tha;
-		/*
-		 * Find (or record) the initial sequence numbers for
-		 * this conversation.  (we pick an arbitrary
-		 * collating order so there's only one entry for
-		 * both directions).
-		 */
-#ifdef INET6
-		memset(&tha, 0, sizeof(tha));
-		rev = 0;
-		if (ip6) {
-			src = &ip6->ip6_src;
-			dst = &ip6->ip6_dst;
-			if (sport > dport)
-				rev = 1;
-			else if (sport == dport) {
-				if (memcmp(src, dst, sizeof ip6->ip6_dst) > 0)
-					rev = 1;
-			}
-			if (rev) {
-				memcpy(&tha.src, dst, sizeof ip6->ip6_dst);
-				memcpy(&tha.dst, src, sizeof ip6->ip6_src);
-				tha.port = dport << 16 | sport;
-			} else {
-				memcpy(&tha.dst, dst, sizeof ip6->ip6_dst);
-				memcpy(&tha.src, src, sizeof ip6->ip6_src);
-				tha.port = sport << 16 | dport;
-			}
-		} else {
-			src = &ip->ip_src;
-			dst = &ip->ip_dst;
-			if (sport > dport)
-				rev = 1;
-			else if (sport == dport) {
-				if (memcmp(src, dst, sizeof ip->ip_dst) > 0)
-					rev = 1;
-			}
-			if (rev) {
-				memcpy(&tha.src, dst, sizeof ip->ip_dst);
-				memcpy(&tha.dst, src, sizeof ip->ip_src);
-				tha.port = dport << 16 | sport;
-			} else {
-				memcpy(&tha.dst, dst, sizeof ip->ip_dst);
-				memcpy(&tha.src, src, sizeof ip->ip_src);
-				tha.port = sport << 16 | dport;
-			}
-		}
-#else
-		rev = 0;
-		src = &ip->ip_src;
-		dst = &ip->ip_dst;
-		if (sport > dport)
-			rev = 1;
-		else if (sport == dport) {
-			if (memcmp(src, dst, sizeof ip->ip_dst) > 0)
-				rev = 1;
-		}
-		if (rev) {
-			memcpy(&tha.src, dst, sizeof ip->ip_dst);
-			memcpy(&tha.dst, src, sizeof ip->ip_src);
-			tha.port = dport << 16 | sport;
-		} else {
-			memcpy(&tha.dst, dst, sizeof ip->ip_dst);
-			memcpy(&tha.src, src, sizeof ip->ip_src);
-			tha.port = sport << 16 | dport;
-		}
-#endif
-
-		threv = rev;
-		for (th = &tcp_seq_hash[tha.port % TSEQ_HASHSIZE];
-		     th->nxt; th = th->nxt)
-			if (memcmp((char *)&tha, (char *)&th->addr,
-				  sizeof(th->addr)) == 0)
-				break;
-
-		if (!th->nxt || (flags & TH_SYN)) {
-			/* didn't find it or new conversation */
-			if (th->nxt == NULL) {
-				th->nxt = (struct tcp_seq_hash *)
-					calloc(1, sizeof(*th));
-				if (th->nxt == NULL)
-					error("tcp_print: calloc");
-			}
-			th->addr = tha;
-			if (rev)
-				th->ack = seq, th->seq = ack - 1;
-			else
-				th->seq = seq, th->ack = ack - 1;
-		} else {
-			if (rev)
-				seq -= th->ack, ack -= th->seq;
-			else
-				seq -= th->seq, ack -= th->ack;
-		}
-
-		thseq = th->seq;
-		thack = th->ack;
-	} else {
-		/*fool gcc*/
-		thseq = thack = threv = 0;
-	}
-	if (hlen > length) {
-		(void)printf(" [bad hdr length %u - too long, > %u]",
-		    hlen, length);
-		return;
-	}
-
-	if (IP_V(ip) == 4 && vflag && !fragmented) {
-		u_int16_t sum, tcp_sum;
-		if (TTEST2(tp->th_sport, length)) {
-			sum = tcp_cksum(ip, tp, length);
-
-                        (void)printf(", cksum 0x%04x",EXTRACT_16BITS(&tp->th_sum));
-			if (sum != 0) {
-				tcp_sum = EXTRACT_16BITS(&tp->th_sum);
-				(void)printf(" (incorrect (-> 0x%04x),",in_cksum_shouldbe(tcp_sum, sum));
-			} else
-				(void)printf(" (correct),");
-		}
-	}
-#ifdef INET6
-	if (IP_V(ip) == 6 && ip6->ip6_plen && vflag && !fragmented) {
-		u_int16_t sum,tcp_sum;
-		if (TTEST2(tp->th_sport, length)) {
-			sum = tcp6_cksum(ip6, tp, length);
-                        (void)printf(", cksum 0x%04x",EXTRACT_16BITS(&tp->th_sum));
-			if (sum != 0) {
-				tcp_sum = EXTRACT_16BITS(&tp->th_sum);
-				(void)printf(" (incorrect (-> 0x%04x),",in_cksum_shouldbe(tcp_sum, sum));
-			} else
-				(void)printf(" (correct),");
-
-		}
-	}
-#endif
-
-	length -= hlen;
-	if (vflag > 1 || length > 0 || flags & (TH_SYN | TH_FIN | TH_RST))
-		(void)printf(" %u:%u(%u)", seq, seq + length, length);
-	if (flags & TH_ACK)
-		(void)printf(" ack %u", ack);
-
-	(void)printf(" win %d", win);
-
-	if (flags & TH_URG)
-		(void)printf(" urg %d", urp);
-	/*
-	 * Handle any options.
-	 */
-	if (hlen > sizeof(*tp)) {
-		register const u_char *cp;
-		register u_int i, opt, datalen;
-		register u_int len;
-
-		hlen -= sizeof(*tp);
-		cp = (const u_char *)tp + sizeof(*tp);
-		putchar(' ');
-		ch = '<';
-		while (hlen > 0) {
-			putchar(ch);
-			TCHECK(*cp);
-			opt = *cp++;
-			if (ZEROLENOPT(opt))
-				len = 1;
-			else {
-				TCHECK(*cp);
-				len = *cp++;	/* total including type, len */
-				if (len < 2 || len > hlen)
-					goto bad;
-				--hlen;		/* account for length byte */
-			}
-			--hlen;			/* account for type byte */
-			datalen = 0;
-
-/* Bail if "l" bytes of data are not left or were not captured  */
-#define LENCHECK(l) { if ((l) > hlen) goto bad; TCHECK2(*cp, l); }
-
-			switch (opt) {
-
-			case TCPOPT_MAXSEG:
-				(void)printf("mss");
-				datalen = 2;
-				LENCHECK(datalen);
-				(void)printf(" %u", EXTRACT_16BITS(cp));
-
-				break;
-
-			case TCPOPT_EOL:
-				(void)printf("eol");
-				break;
-
-			case TCPOPT_NOP:
-				(void)printf("nop");
-				break;
-
-			case TCPOPT_WSCALE:
-				(void)printf("wscale");
-				datalen = 1;
-				LENCHECK(datalen);
-				(void)printf(" %u", *cp);
-				break;
-
-			case TCPOPT_SACKOK:
-				(void)printf("sackOK");
-				break;
-
-			case TCPOPT_SACK:
-				datalen = len - 2;
-				if (datalen % 8 != 0) {
-					(void)printf("malformed sack");
-				} else {
-					u_int32_t s, e;
-
-					(void)printf("sack %d ", datalen / 8);
-					for (i = 0; i < datalen; i += 8) {
-						LENCHECK(i + 4);
-						s = EXTRACT_32BITS(cp + i);
-						LENCHECK(i + 8);
-						e = EXTRACT_32BITS(cp + i + 4);
-						if (threv) {
-							s -= thseq;
-							e -= thseq;
-						} else {
-							s -= thack;
-							e -= thack;
-						}
-						(void)printf("{%u:%u}", s, e);
-					}
-				}
-				break;
-
-			case TCPOPT_ECHO:
-				(void)printf("echo");
-				datalen = 4;
-				LENCHECK(datalen);
-				(void)printf(" %u", EXTRACT_32BITS(cp));
-				break;
-
-			case TCPOPT_ECHOREPLY:
-				(void)printf("echoreply");
-				datalen = 4;
-				LENCHECK(datalen);
-				(void)printf(" %u", EXTRACT_32BITS(cp));
-				break;
-
-			case TCPOPT_TIMESTAMP:
-				(void)printf("timestamp");
-				datalen = 8;
-				LENCHECK(4);
-				(void)printf(" %u", EXTRACT_32BITS(cp));
-				LENCHECK(datalen);
-				(void)printf(" %u", EXTRACT_32BITS(cp + 4));
-				break;
-
-			case TCPOPT_CC:
-				(void)printf("cc");
-				datalen = 4;
-				LENCHECK(datalen);
-				(void)printf(" %u", EXTRACT_32BITS(cp));
-				break;
-
-			case TCPOPT_CCNEW:
-				(void)printf("ccnew");
-				datalen = 4;
-				LENCHECK(datalen);
-				(void)printf(" %u", EXTRACT_32BITS(cp));
-				break;
-
-			case TCPOPT_CCECHO:
-				(void)printf("ccecho");
-				datalen = 4;
-				LENCHECK(datalen);
-				(void)printf(" %u", EXTRACT_32BITS(cp));
-				break;
-
-			case TCPOPT_SIGNATURE:
-				(void)printf("md5:");
-				datalen = TCP_SIGLEN;
-				LENCHECK(datalen);
-#ifdef HAVE_LIBCRYPTO
-				switch (tcp_verify_signature(ip, tp,
-				    bp + TH_OFF(tp) * 4, length, cp)) {
-
-				case SIGNATURE_VALID:
-					(void)printf("valid");
-					break;
-
-				case SIGNATURE_INVALID:
-					(void)printf("invalid");
-					break;
-
-				case CANT_CHECK_SIGNATURE:
-					(void)printf("can't check - ");
-					for (i = 0; i < TCP_SIGLEN; ++i)
-						(void)printf("%02x", cp[i]);
-					break;
-				}
-#else
-				for (i = 0; i < TCP_SIGLEN; ++i)
-					(void)printf("%02x", cp[i]);
-#endif
-				break;
-
-			default:
-				(void)printf("opt-%u:", opt);
-				datalen = len - 2;
-				for (i = 0; i < datalen; ++i) {
-					LENCHECK(i);
-					(void)printf("%02x", cp[i]);
-				}
-				break;
-			}
-
-			/* Account for data printed */
-			cp += datalen;
-			hlen -= datalen;
-
-			/* Check specification against observed length */
-			++datalen;			/* option octet */
-			if (!ZEROLENOPT(opt))
-				++datalen;		/* size octet */
-			if (datalen != len)
-				(void)printf("[len %d]", len);
-			ch = ',';
-			if (opt == TCPOPT_EOL)
-				break;
-		}
-		putchar('>');
-	}
-
-	if (length <= 0)
-		return;
-
-	/*
-	 * Decode payload if necessary.
-	 */
-	bp += TH_OFF(tp) * 4;
-	if (flags & TH_RST) {
-		if (vflag)
-			print_tcp_rst_data(bp, length);
-	} else {
-		if (sport == TELNET_PORT || dport == TELNET_PORT) {
-			if (!qflag && vflag)
-				telnet_print(bp, length);
-		} else if (sport == BGP_PORT || dport == BGP_PORT)
-			bgp_print(bp, length);
-		else if (sport == PPTP_PORT || dport == PPTP_PORT)
-			pptp_print(bp);
-#ifdef TCPDUMP_DO_SMB
-		else if (sport == NETBIOS_SSN_PORT || dport == NETBIOS_SSN_PORT)
-			nbt_tcp_print(bp, length);
-#endif
-		else if (sport == BEEP_PORT || dport == BEEP_PORT)
-			beep_print(bp, length);
-		else if (length > 2 &&
-		    (sport == NAMESERVER_PORT || dport == NAMESERVER_PORT ||
-		     sport == MULTICASTDNS_PORT || dport == MULTICASTDNS_PORT)) {
-			/*
-			 * TCP DNS query has 2byte length at the head.
-			 * XXX packet could be unaligned, it can go strange
-			 */
-			ns_print(bp + 2, length - 2, 0);
-		} else if (sport == MSDP_PORT || dport == MSDP_PORT) {
-			msdp_print(bp, length);
-		}
-                else if (length > 0 && (sport == LDP_PORT || dport == LDP_PORT)) {
-                        ldp_print(bp, length);
-		}
-	}
-	return;
-bad:
-	fputs("[bad opt]", stdout);
-	if (ch != '\0')
-		putchar('>');
-	return;
-trunc:
-	fputs("[|tcp]", stdout);
-	if (ch != '\0')
-		putchar('>');
-}
-
-/*
- * RFC1122 says the following on data in RST segments:
- *
- *         4.2.2.12  RST Segment: RFC-793 Section 3.4
- *
- *            A TCP SHOULD allow a received RST segment to include data.
- *
- *            DISCUSSION
- *                 It has been suggested that a RST segment could contain
- *                 ASCII text that encoded and explained the cause of the
- *                 RST.  No standard has yet been established for such
- *                 data.
- *
- */
-
-static void
-print_tcp_rst_data(register const u_char *sp, u_int length)
-{
-	int c;
-
-	if (TTEST2(*sp, length))
-		printf(" [RST");
-	else
-		printf(" [!RST");
-	if (length > MAX_RST_DATA_LEN) {
-		length = MAX_RST_DATA_LEN;	/* can use -X for longer */
-		putchar('+');			/* indicate we truncate */
-	}
-	putchar(' ');
-	while (length-- && sp <= snapend) {
-		c = *sp++;
-		safeputchar(c);
-	}
-	putchar(']');
-}
-
-#ifdef HAVE_LIBCRYPTO
-static int
-tcp_verify_signature(const struct ip *ip, const struct tcphdr *tp,
-    const u_char *data, int length, const u_char *rcvsig)
-{
-        struct tcphdr tp1;
-	u_char sig[TCP_SIGLEN];
-	char zero_proto = 0;
-	MD5_CTX ctx;
-	u_int16_t savecsum, tlen;
-#ifdef INET6
-	struct ip6_hdr *ip6;
-#endif
-	u_int32_t len32;
-	u_int8_t nxt;
-
-	tp1 = *tp;
-
-	if (tcpmd5secret == NULL)
-		return (CANT_CHECK_SIGNATURE);
-
-	MD5_Init(&ctx);
-	/*
-	 * Step 1: Update MD5 hash with IP pseudo-header.
-	 */
-	if (IP_V(ip) == 4) {
-		MD5_Update(&ctx, (char *)&ip->ip_src, sizeof(ip->ip_src));
-		MD5_Update(&ctx, (char *)&ip->ip_dst, sizeof(ip->ip_dst));
-		MD5_Update(&ctx, (char *)&zero_proto, sizeof(zero_proto));
-		MD5_Update(&ctx, (char *)&ip->ip_p, sizeof(ip->ip_p));
-		tlen = EXTRACT_16BITS(&ip->ip_len) - IP_HL(ip) * 4;
-		tlen = htons(tlen);
-		MD5_Update(&ctx, (char *)&tlen, sizeof(tlen));
-#ifdef INET6
-	} else if (IP_V(ip) == 6) {
-		ip6 = (struct ip6_hdr *)ip;
-		MD5_Update(&ctx, (char *)&ip6->ip6_src, sizeof(ip6->ip6_src));
-		MD5_Update(&ctx, (char *)&ip6->ip6_dst, sizeof(ip6->ip6_dst));
-		len32 = htonl(ntohs(ip6->ip6_plen));
-		MD5_Update(&ctx, (char *)&len32, sizeof(len32));
-		nxt = 0;
-		MD5_Update(&ctx, (char *)&nxt, sizeof(nxt));
-		MD5_Update(&ctx, (char *)&nxt, sizeof(nxt));
-		MD5_Update(&ctx, (char *)&nxt, sizeof(nxt));
-		nxt = IPPROTO_TCP;
-		MD5_Update(&ctx, (char *)&nxt, sizeof(nxt));
-#endif
-	} else
-		return (CANT_CHECK_SIGNATURE);
-
-	/*
-	 * Step 2: Update MD5 hash with TCP header, excluding options.
-	 * The TCP checksum must be set to zero.
-	 */
-	savecsum = tp1.th_sum;
-	tp1.th_sum = 0;
-	MD5_Update(&ctx, (char *)&tp1, sizeof(struct tcphdr));
-	tp1.th_sum = savecsum;
-	/*
-	 * Step 3: Update MD5 hash with TCP segment data, if present.
-	 */
-	if (length > 0)
-		MD5_Update(&ctx, data, length);
-	/*
-	 * Step 4: Update MD5 hash with shared secret.
-	 */
-	MD5_Update(&ctx, tcpmd5secret, strlen(tcpmd5secret));
-	MD5_Final(sig, &ctx);
-
-	if (memcmp(rcvsig, sig, TCP_SIGLEN) == 0)
-		return (SIGNATURE_VALID);
-	else
-		return (SIGNATURE_INVALID);
-}
-#endif /* HAVE_LIBCRYPTO */