Getaddrinfo(), getnameinfo(), and etc support in libc/net.

Several udp and raw apps IPv6 support.

Reviewed by: freebsd-arch, cvs-committers
Obtained from: KAME project

3 files changed, 1249 insertions, 0 deletions

diff --git a/usr.sbin/traceroute6/Makefile b/usr.sbin/traceroute6/Makefile
new file mode 100644
index 0000000..2b151a6
--- /dev/null
+++ b/usr.sbin/traceroute6/Makefile
@@ -0,0 +1,26 @@
+# Copyright (c) 1996 WIDE Project. All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without
+# modifications, are permitted provided that the above copyright notice
+# and this paragraph are duplicated in all such forms and that any
+# documentation, advertising materials, and other materials related to
+# such distribution and use acknowledge that the software was developed
+# by the WIDE Project, Japan. The name of the Project may not 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.
+# $FreeBSD$
+
+PROG=	traceroute6
+
+BINOWN=	root
+BINGRP=	bin
+BINMODE=4555
+
+CFLAGS+=-DINET6
+
+MAN8=	traceroute6.8
+
+.include <bsd.prog.mk>
diff --git a/usr.sbin/traceroute6/traceroute6.8 b/usr.sbin/traceroute6/traceroute6.8
new file mode 100644
index 0000000..b98773f
--- /dev/null
+++ b/usr.sbin/traceroute6/traceroute6.8
@@ -0,0 +1,96 @@
+.\" Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
+.\" All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\" 3. Neither the name of the project 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 BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\"     $Id: traceroute6.8,v 1.1.1.1 1999/08/08 23:32:38 itojun Exp $
+.\"	$FreeBSD$
+.\"
+.Dd May 17, 1998
+.Dt TRACEROUTE6 8
+.Os KAME
+.\"
+.Sh NAME
+.Nm traceroute6
+.Nd print the route IPv6 packets will take to the destination
+.\"
+.Sh SYNOPSIS
+.Nm
+.Op Fl dlnrv
+.Op Fl m Ar hoplimit
+.Op Fl p Ar port
+.Op Fl q Ar probes
+.Op Fl s Ar src
+.Op Fl w Ar waittime
+.\"
+.Sh DESCRIPTION
+.Bl -tag -width Ds
+.It Fl d
+Debug mode.
+.It Fl m Ar hoplimit
+Specify maximum hoplimit.
+.It Fl l
+Print both host hostnames and numeric addresses.
+Normally
+.Nm
+prints only hostnames if
+.Fl n
+is not specified, and only numeric addresses if
+.Fl n
+is specified.
+.It Fl n
+Do not resolve numeric address to hostname.
+.It Fl p Ar port
+Set UDP port number to
+.Ar port .
+.It Fl q Ar probes
+Set the number of probe per hop count to
+.Ar probes .
+.It Fl r
+.It Fl s Ar src
+.Ar Src
+specifies the source IPv6 address to be used.
+.It Fl v
+Be verbose.
+.It Fl w Ar waittime
+Specify the delay time between probes.
+.El
+.\"
+.Sh RETURN VALUES
+.Nm Traceroute6
+will exit with 0 on success, and non-zero on errors.
+.\"
+.Sh SEE ALSO
+.Xr ping 8 ,
+.Xr ping6 8 ,
+.Xr traceroute 8
+.\"
+.Sh HISTORY
+The
+.Nm
+command first appeared in WIDE hydrangea IPv6 protocol stack kit.
+.\"
+.\" .Sh BUGS
+.\" (to be written)
diff --git a/usr.sbin/traceroute6/traceroute6.c b/usr.sbin/traceroute6/traceroute6.c
new file mode 100644
index 0000000..a1b665e
--- /dev/null
+++ b/usr.sbin/traceroute6/traceroute6.c
@@ -0,0 +1,1127 @@
+/*
+ * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of the project 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 BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * $FreeBSD$
+ */
+
+/*-
+ * Copyright (c) 1990, 1993
+ *	The Regents of the University of California.  All rights reserved.
+ *
+ * This code is derived from software contributed to Berkeley by
+ * Van Jacobson.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *	This product includes software developed by the University of
+ *	California, Berkeley and its contributors.
+ * 4. 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 BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#ifndef lint
+static char copyright[] =
+"@(#) Copyright (c) 1990, 1993\n\
+	The Regents of the University of California.  All rights reserved.\n";
+#endif /* not lint */
+
+#ifndef lint
+static char sccsid[] = "@(#)traceroute.c	8.1 (Berkeley) 6/6/93";
+#endif /* not lint */
+
+/*
+ * traceroute host  - trace the route ip packets follow going to "host".
+ *
+ * Attempt to trace the route an ip packet would follow to some
+ * internet host.  We find out intermediate hops by launching probe
+ * packets with a small ttl (time to live) then listening for an
+ * icmp "time exceeded" reply from a gateway.  We start our probes
+ * with a ttl of one and increase by one until we get an icmp "port
+ * unreachable" (which means we got to "host") or hit a max (which
+ * defaults to 30 hops & can be changed with the -m flag).  Three
+ * probes (change with -q flag) are sent at each ttl setting and a
+ * line is printed showing the ttl, address of the gateway and
+ * round trip time of each probe.  If the probe answers come from
+ * different gateways, the address of each responding system will
+ * be printed.  If there is no response within a 5 sec. timeout
+ * interval (changed with the -w flag), a "*" is printed for that
+ * probe.
+ *
+ * Probe packets are UDP format.  We don't want the destination
+ * host to process them so the destination port is set to an
+ * unlikely value (if some clod on the destination is using that
+ * value, it can be changed with the -p flag).
+ *
+ * A sample use might be:
+ *
+ *     [yak 71]% traceroute nis.nsf.net.
+ *     traceroute to nis.nsf.net (35.1.1.48), 30 hops max, 56 byte packet
+ *      1  helios.ee.lbl.gov (128.3.112.1)  19 ms  19 ms  0 ms
+ *      2  lilac-dmc.Berkeley.EDU (128.32.216.1)  39 ms  39 ms  19 ms
+ *      3  lilac-dmc.Berkeley.EDU (128.32.216.1)  39 ms  39 ms  19 ms
+ *      4  ccngw-ner-cc.Berkeley.EDU (128.32.136.23)  39 ms  40 ms  39 ms
+ *      5  ccn-nerif22.Berkeley.EDU (128.32.168.22)  39 ms  39 ms  39 ms
+ *      6  128.32.197.4 (128.32.197.4)  40 ms  59 ms  59 ms
+ *      7  131.119.2.5 (131.119.2.5)  59 ms  59 ms  59 ms
+ *      8  129.140.70.13 (129.140.70.13)  99 ms  99 ms  80 ms
+ *      9  129.140.71.6 (129.140.71.6)  139 ms  239 ms  319 ms
+ *     10  129.140.81.7 (129.140.81.7)  220 ms  199 ms  199 ms
+ *     11  nic.merit.edu (35.1.1.48)  239 ms  239 ms  239 ms
+ *
+ * Note that lines 2 & 3 are the same.  This is due to a buggy
+ * kernel on the 2nd hop system -- lbl-csam.arpa -- that forwards
+ * packets with a zero ttl.
+ *
+ * A more interesting example is:
+ *
+ *     [yak 72]% traceroute allspice.lcs.mit.edu.
+ *     traceroute to allspice.lcs.mit.edu (18.26.0.115), 30 hops max
+ *      1  helios.ee.lbl.gov (128.3.112.1)  0 ms  0 ms  0 ms
+ *      2  lilac-dmc.Berkeley.EDU (128.32.216.1)  19 ms  19 ms  19 ms
+ *      3  lilac-dmc.Berkeley.EDU (128.32.216.1)  39 ms  19 ms  19 ms
+ *      4  ccngw-ner-cc.Berkeley.EDU (128.32.136.23)  19 ms  39 ms  39 ms
+ *      5  ccn-nerif22.Berkeley.EDU (128.32.168.22)  20 ms  39 ms  39 ms
+ *      6  128.32.197.4 (128.32.197.4)  59 ms  119 ms  39 ms
+ *      7  131.119.2.5 (131.119.2.5)  59 ms  59 ms  39 ms
+ *      8  129.140.70.13 (129.140.70.13)  80 ms  79 ms  99 ms
+ *      9  129.140.71.6 (129.140.71.6)  139 ms  139 ms  159 ms
+ *     10  129.140.81.7 (129.140.81.7)  199 ms  180 ms  300 ms
+ *     11  129.140.72.17 (129.140.72.17)  300 ms  239 ms  239 ms
+ *     12  * * *
+ *     13  128.121.54.72 (128.121.54.72)  259 ms  499 ms  279 ms
+ *     14  * * *
+ *     15  * * *
+ *     16  * * *
+ *     17  * * *
+ *     18  ALLSPICE.LCS.MIT.EDU (18.26.0.115)  339 ms  279 ms  279 ms
+ *
+ * (I start to see why I'm having so much trouble with mail to
+ * MIT.)  Note that the gateways 12, 14, 15, 16 & 17 hops away
+ * either don't send ICMP "time exceeded" messages or send them
+ * with a ttl too small to reach us.  14 - 17 are running the
+ * MIT C Gateway code that doesn't send "time exceeded"s.  God
+ * only knows what's going on with 12.
+ *
+ * The silent gateway 12 in the above may be the result of a bug in
+ * the 4.[23]BSD network code (and its derivatives):  4.x (x <= 3)
+ * sends an unreachable message using whatever ttl remains in the
+ * original datagram.  Since, for gateways, the remaining ttl is
+ * zero, the icmp "time exceeded" is guaranteed to not make it back
+ * to us.  The behavior of this bug is slightly more interesting
+ * when it appears on the destination system:
+ *
+ *      1  helios.ee.lbl.gov (128.3.112.1)  0 ms  0 ms  0 ms
+ *      2  lilac-dmc.Berkeley.EDU (128.32.216.1)  39 ms  19 ms  39 ms
+ *      3  lilac-dmc.Berkeley.EDU (128.32.216.1)  19 ms  39 ms  19 ms
+ *      4  ccngw-ner-cc.Berkeley.EDU (128.32.136.23)  39 ms  40 ms  19 ms
+ *      5  ccn-nerif35.Berkeley.EDU (128.32.168.35)  39 ms  39 ms  39 ms
+ *      6  csgw.Berkeley.EDU (128.32.133.254)  39 ms  59 ms  39 ms
+ *      7  * * *
+ *      8  * * *
+ *      9  * * *
+ *     10  * * *
+ *     11  * * *
+ *     12  * * *
+ *     13  rip.Berkeley.EDU (128.32.131.22)  59 ms !  39 ms !  39 ms !
+ *
+ * Notice that there are 12 "gateways" (13 is the final
+ * destination) and exactly the last half of them are "missing".
+ * What's really happening is that rip (a Sun-3 running Sun OS3.5)
+ * is using the ttl from our arriving datagram as the ttl in its
+ * icmp reply.  So, the reply will time out on the return path
+ * (with no notice sent to anyone since icmp's aren't sent for
+ * icmp's) until we probe with a ttl that's at least twice the path
+ * length.  I.e., rip is really only 7 hops away.  A reply that
+ * returns with a ttl of 1 is a clue this problem exists.
+ * Traceroute prints a "!" after the time if the ttl is <= 1.
+ * Since vendors ship a lot of obsolete (DEC's Ultrix, Sun 3.x) or
+ * non-standard (HPUX) software, expect to see this problem
+ * frequently and/or take care picking the target host of your
+ * probes.
+ *
+ * Other possible annotations after the time are !H, !N, !P (got a host,
+ * network or protocol unreachable, respectively), !S or !F (source
+ * route failed or fragmentation needed -- neither of these should
+ * ever occur and the associated gateway is busted if you see one).  If
+ * almost all the probes result in some kind of unreachable, traceroute
+ * will give up and exit.
+ *
+ * Notes
+ * -----
+ * This program must be run by root or be setuid.  (I suggest that
+ * you *don't* make it setuid -- casual use could result in a lot
+ * of unnecessary traffic on our poor, congested nets.)
+ *
+ * This program requires a kernel mod that does not appear in any
+ * system available from Berkeley:  A raw ip socket using proto
+ * IPPROTO_RAW must interpret the data sent as an ip datagram (as
+ * opposed to data to be wrapped in a ip datagram).  See the README
+ * file that came with the source to this program for a description
+ * of the mods I made to /sys/netinet/raw_ip.c.  Your mileage may
+ * vary.  But, again, ANY 4.x (x < 4) BSD KERNEL WILL HAVE TO BE
+ * MODIFIED TO RUN THIS PROGRAM.
+ *
+ * The udp port usage may appear bizarre (well, ok, it is bizarre).
+ * The problem is that an icmp message only contains 8 bytes of
+ * data from the original datagram.  8 bytes is the size of a udp
+ * header so, if we want to associate replies with the original
+ * datagram, the necessary information must be encoded into the
+ * udp header (the ip id could be used but there's no way to
+ * interlock with the kernel's assignment of ip id's and, anyway,
+ * it would have taken a lot more kernel hacking to allow this
+ * code to set the ip id).  So, to allow two or more users to
+ * use traceroute simultaneously, we use this task's pid as the
+ * source port (the high bit is set to move the port number out
+ * of the "likely" range).  To keep track of which probe is being
+ * replied to (so times and/or hop counts don't get confused by a
+ * reply that was delayed in transit), we increment the destination
+ * port number before each probe.
+ *
+ * Don't use this as a coding example.  I was trying to find a
+ * routing problem and this code sort-of popped out after 48 hours
+ * without sleep.  I was amazed it ever compiled, much less ran.
+ *
+ * I stole the idea for this program from Steve Deering.  Since
+ * the first release, I've learned that had I attended the right
+ * IETF working group meetings, I also could have stolen it from Guy
+ * Almes or Matt Mathis.  I don't know (or care) who came up with
+ * the idea first.  I envy the originators' perspicacity and I'm
+ * glad they didn't keep the idea a secret.
+ *
+ * Tim Seaver, Ken Adelman and C. Philip Wood provided bug fixes and/or
+ * enhancements to the original distribution.
+ *
+ * I've hacked up a round-trip-route version of this that works by
+ * sending a loose-source-routed udp datagram through the destination
+ * back to yourself.  Unfortunately, SO many gateways botch source
+ * routing, the thing is almost worthless.  Maybe one day...
+ *
+ *  -- Van Jacobson (van@helios.ee.lbl.gov)
+ *     Tue Dec 20 03:50:13 PST 1988
+ */
+
+#include <sys/param.h>
+#include <sys/time.h>
+#include <sys/socket.h>
+#include <sys/uio.h>
+#include <sys/file.h>
+#include <sys/ioctl.h>
+
+#include <netinet/in.h>
+
+#include <arpa/inet.h>
+
+#include <netdb.h>
+#include <stdio.h>
+#include <err.h>
+#include <errno.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+#include <netinet/ip6.h>
+#include <netinet/icmp6.h>
+#include <netinet/udp.h>
+
+#ifdef IPSEC
+#include <net/route.h>
+#include <netinet6/ipsec.h>
+#endif
+
+#define	freehostent(hp)
+#define	DUMMY_PORT 10010
+
+#define	MAXPACKET	65535	/* max ip packet size */
+#ifndef MAXHOSTNAMELEN
+#define	MAXHOSTNAMELEN	64
+#endif
+
+#ifndef FD_SET
+#define	NFDBITS         (8*sizeof(fd_set))
+#define	FD_SETSIZE      NFDBITS
+#define	FD_SET(n, p)    ((p)->fds_bits[(n)/NFDBITS] |= (1 << ((n) % NFDBITS)))
+#define	FD_CLR(n, p)    ((p)->fds_bits[(n)/NFDBITS] &= ~(1 << ((n) % NFDBITS)))
+#define	FD_ISSET(n, p)  ((p)->fds_bits[(n)/NFDBITS] & (1 << ((n) % NFDBITS)))
+#define	FD_ZERO(p)      bzero((char *)(p), sizeof(*(p)))
+#endif
+
+#define	Fprintf (void)fprintf
+#define	Sprintf (void)sprintf
+#define	Printf (void)printf
+
+/*
+ * format of a (udp) probe packet.
+ */
+struct opacket {
+	u_char seq;		/* sequence number of this packet */
+	u_char hops;		/* hop limit of the packet */
+	struct timeval tv;	/* time packet left */
+};
+
+u_char	packet[512];		/* last inbound (icmp) packet */
+struct opacket	*outpacket;	/* last output (udp) packet */
+
+int	main __P((int, char *[]));
+int	wait_for_reply __P((int, struct msghdr *));
+int	setpolicy __P((int so, char *policy));
+void	send_probe __P((int, int));
+struct udphdr *get_udphdr __P((struct ip6_hdr *, u_char *));
+int	get_hoplim __P((struct msghdr *));
+double	deltaT __P((struct timeval *, struct timeval *));
+char	*pr_type __P((int));
+int	packet_ok __P((struct msghdr *, int, int));
+void	print __P((struct msghdr *, int));
+void	tvsub __P((struct timeval *, struct timeval *));
+char	*inetname __P((struct in6_addr *));
+void	usage __P((void));
+
+int rcvsock;			/* receive (icmp) socket file descriptor */
+int sndsock;			/* send (udp) socket file descriptor */
+struct timezone tz;		/* leftover */
+
+struct msghdr rcvmhdr;
+struct iovec rcviov[2];
+int rcvhlim;
+struct in6_pktinfo *rcvpktinfo;
+
+struct sockaddr_in6 Src, Dst, Rcv;
+struct sockaddr_in6 *src = &Src, *dst = &Dst, *rcv = &Rcv;
+int datalen;			/* How much data */
+char rtbuf[1024];	/*XXX*/
+struct cmsghdr *cmsg;
+
+char *source = 0;
+char *hostname;
+
+int nprobes = 3;
+int max_hops = 30;
+u_short ident;
+u_short port = 32768+666;	/* start udp dest port # for probe packets */
+int options;			/* socket options */
+int verbose;
+int waittime = 5;		/* time to wait for response (in seconds) */
+int nflag;			/* print addresses numerically */
+int lflag;			/* print both numerical address & hostname */
+
+char ntop_buf[INET6_ADDRSTRLEN]; /* for inet_ntop() */
+
+int
+main(argc, argv)
+	int argc;
+	char *argv[];
+{
+	extern char *optarg;
+	extern int optind;
+	struct hostent *hp;
+	int ch, i, on, probe, seq, hops;
+	static u_char rcvcmsgbuf[CMSG_SPACE(sizeof(struct in6_pktinfo))
+				+ CMSG_SPACE(sizeof(int))];
+
+	on = 1;
+	seq = 0;
+
+	while ((ch = getopt(argc, argv, "dlm:np:q:rs:w:vg:")) != EOF)
+		switch(ch) {
+		case 'd':
+			options |= SO_DEBUG;
+			break;
+		case 'l':
+			lflag++;
+			break;
+		case 'g':
+			hp = getipnodebyname(optarg, AF_INET6, 0, &h_errno);
+			if (hp == NULL) {
+				Fprintf(stderr,
+				    "traceroute6: unknown host %s\n", optarg);
+				exit(1);
+			}
+			if (cmsg == NULL)
+				cmsg = inet6_rthdr_init(rtbuf, IPV6_RTHDR_TYPE_0);
+			inet6_rthdr_add(cmsg, (struct in6_addr *)hp->h_addr, IPV6_RTHDR_LOOSE);
+			break;
+		case 'm':
+			max_hops = atoi(optarg);
+			if (max_hops <= 1) {
+				Fprintf(stderr,
+				    "traceroute6: max hoplimit must be >1.\n");
+				exit(1);
+			}
+			break;
+		case 'n':
+			nflag++;
+			break;
+		case 'p':
+			port = atoi(optarg);
+			if (port < 1) {
+				Fprintf(stderr,
+				    "traceroute6: port must be >0.\n");
+				exit(1);
+			}
+			break;
+		case 'q':
+			nprobes = atoi(optarg);
+			if (nprobes < 1) {
+				Fprintf(stderr,
+				    "traceroute6: nprobes must be >0.\n");
+				exit(1);
+			}
+			break;
+		case 'r':
+			options |= SO_DONTROUTE;
+			break;
+		case 's':
+			/*
+			 * set the ip source address of the outbound
+			 * probe (e.g., on a multi-homed host).
+			 */
+			source = optarg;
+			break;
+		case 'v':
+			verbose++;
+			break;
+		case 'w':
+			waittime = atoi(optarg);
+			if (waittime <= 1) {
+				Fprintf(stderr,
+				    "traceroute6: wait must be >1 sec.\n");
+				exit(1);
+			}
+			break;
+		default:
+			usage();
+		}
+	argc -= optind;
+	argv += optind;
+
+	if (argc < 1)
+		usage();
+
+#if 1
+	setvbuf(stdout, NULL, _IOLBF, BUFSIZ);
+#else
+	setlinebuf (stdout);
+#endif
+
+	(void) bzero((char *)dst, sizeof(Dst));
+	Dst.sin6_family = AF_INET6;
+
+	hp = (struct hostent *)gethostbyname2(*argv, AF_INET6);
+	if (hp == NULL) {
+		if (inet_pton(AF_INET6, *argv, &Dst.sin6_addr) != 1) {
+			(void)fprintf(stderr,
+				      "traceroute6: unknown host %s\n", *argv);
+			exit(1);
+		}
+		hostname = *argv;
+	} else {
+		bcopy(hp->h_addr, (caddr_t)&Dst.sin6_addr, hp->h_length);
+		hostname = strdup(hp->h_name);
+	}
+	freehostent(hp);
+
+	if (*++argv)
+		datalen = atoi(*argv);
+	if (datalen < 0 || datalen >= MAXPACKET - sizeof(struct opacket)) {
+		Fprintf(stderr,
+		    "traceroute6: packet size must be 0 <= s < %ld.\n",
+		    (long)(MAXPACKET - sizeof(struct opacket)));
+		exit(1);
+	}
+	datalen += sizeof(struct opacket);
+	outpacket = (struct opacket *)malloc((unsigned)datalen);
+	if (! outpacket) {
+		perror("traceroute6: malloc");
+		exit(1);
+	}
+	(void) bzero((char *)outpacket, datalen);
+
+	/*
+	 * Receive ICMP
+	 */
+	if ((rcvsock = socket(AF_INET6, SOCK_RAW, IPPROTO_ICMPV6)) < 0) {
+		perror("traceroute6: icmp socket");
+		exit(5);
+	}
+	/* initialize msghdr for receiving packets */
+	rcviov[0].iov_base = (caddr_t)packet;
+	rcviov[0].iov_len = sizeof(packet);
+	rcvmhdr.msg_name = (caddr_t)rcv;
+	rcvmhdr.msg_namelen = sizeof(*rcv);
+	rcvmhdr.msg_iov = rcviov;
+	rcvmhdr.msg_iovlen = 1;
+	rcvmhdr.msg_control = (caddr_t) rcvcmsgbuf;
+	rcvmhdr.msg_controllen = sizeof(rcvcmsgbuf);
+
+	/* specify to tell receiving interface */
+	if (setsockopt(rcvsock, IPPROTO_IPV6, IPV6_PKTINFO, &on,
+		       sizeof(on)) < 0)
+		err(1, "setsockopt(IPV6_PKTINFO)");
+
+	/* specify to tell value of hoplimit field of received IP6 hdr */
+	if (setsockopt(rcvsock, IPPROTO_IPV6, IPV6_HOPLIMIT, &on,
+		       sizeof(on)) < 0)
+		err(1, "setsockopt(IPV6_HOPLIMIT)");
+
+	if (options & SO_DEBUG)
+		(void) setsockopt(rcvsock, SOL_SOCKET, SO_DEBUG,
+				  (char *)&on, sizeof(on));
+	if (options & SO_DONTROUTE)
+		(void) setsockopt(rcvsock, SOL_SOCKET, SO_DONTROUTE,
+				  (char *)&on, sizeof(on));
+#ifdef IPSEC
+#ifdef IPSEC_POLICY_IPSEC
+	/*
+	 * do not raise error even if setsockopt fails, kernel may have ipsec
+	 * turned off.
+	 */
+	if (setpolicy(rcvsock, "in bypass") < 0)
+		errx(1, ipsec_strerror());
+	if (setpolicy(rcvsock, "out bypass") < 0)
+		errx(1, ipsec_strerror());
+#else
+    {
+	int level = IPSEC_LEVEL_NONE;
+
+	(void)setsockopt(rcvsock, IPPROTO_IPV6, IPV6_ESP_TRANS_LEVEL, &level,
+		sizeof(level));
+	(void)setsockopt(rcvsock, IPPROTO_IPV6, IPV6_ESP_NETWORK_LEVEL, &level,
+		sizeof(level));
+#ifdef IP_AUTH_TRANS_LEVEL
+	(void)setsockopt(rcvsock, IPPROTO_IPV6, IPV6_AUTH_TRANS_LEVEL, &level,
+		sizeof(level));
+#else
+	(void)setsockopt(rcvsock, IPPROTO_IPV6, IPV6_AUTH_LEVEL, &level,
+		sizeof(level));
+#endif
+#ifdef IP_AUTH_NETWORK_LEVEL
+	(void)setsockopt(rcvsock, IPPROTO_IPV6, IPV6_AUTH_NETWORK_LEVEL, &level,
+		sizeof(level));
+#endif
+    }
+#endif /*IPSEC_POLICY_IPSEC*/
+#endif /*IPSEC*/
+
+	/*
+	 * Send UDP
+	 */
+	if ((sndsock = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) {
+		perror("traceroute6: udp socket");
+		exit(5);
+	}
+#ifdef SO_SNDBUF
+	if (setsockopt(sndsock, SOL_SOCKET, SO_SNDBUF, (char *)&datalen,
+		       sizeof(datalen)) < 0) {
+		perror("traceroute6: SO_SNDBUF");
+		exit(6);
+	}
+#endif /* SO_SNDBUF */
+	if (options & SO_DEBUG)
+		(void) setsockopt(sndsock, SOL_SOCKET, SO_DEBUG,
+				  (char *)&on, sizeof(on));
+	if (options & SO_DONTROUTE)
+		(void) setsockopt(sndsock, SOL_SOCKET, SO_DONTROUTE,
+				  (char *)&on, sizeof(on));
+	if (cmsg != NULL) {
+		inet6_rthdr_lasthop(cmsg, IPV6_RTHDR_LOOSE);
+		(void) setsockopt(sndsock, IPPROTO_IPV6, IPV6_PKTOPTIONS,
+				  rtbuf, cmsg->cmsg_len);
+	}
+#ifdef IPSEC
+#ifdef IPSEC_POLICY_IPSEC
+	/*
+	 * do not raise error even if setsockopt fails, kernel may have ipsec
+	 * turned off.
+	 */
+	if (setpolicy(sndsock, "in bypass") < 0)
+		errx(1, ipsec_strerror());
+	if (setpolicy(sndsock, "out bypass") < 0)
+		errx(1, ipsec_strerror());
+#else
+    {
+	int level = IPSEC_LEVEL_BYPASS;
+
+	(void)setsockopt(sndsock, IPPROTO_IPV6, IPV6_ESP_TRANS_LEVEL, &level,
+		sizeof(level));
+	(void)setsockopt(sndsock, IPPROTO_IPV6, IPV6_ESP_NETWORK_LEVEL, &level,
+		sizeof(level));
+#ifdef IP_AUTH_TRANS_LEVEL
+	(void)setsockopt(sndsock, IPPROTO_IPV6, IPV6_AUTH_TRANS_LEVEL, &level,
+		sizeof(level));
+#else
+	(void)setsockopt(sndsock, IPPROTO_IPV6, IPV6_AUTH_LEVEL, &level,
+		sizeof(level));
+#endif
+#ifdef IP_AUTH_NETWORK_LEVEL
+	(void)setsockopt(sndsock, IPPROTO_IPV6, IPV6_AUTH_NETWORK_LEVEL, &level,
+		sizeof(level));
+#endif
+    }
+#endif /*IPSEC_POLICY_IPSEC*/
+#endif /*IPSEC*/
+
+	/*
+	 * Source selection
+	 */
+	bzero((char *)src, sizeof(Src));
+	if (source) {
+		if (inet_pton(AF_INET6, source, &Src.sin6_addr) != 1) {
+			Printf("traceroute6: unknown host %s\n", source);
+			exit(1);
+		}
+	} else {
+		struct sockaddr_in6 Nxt;
+		int dummy, len;
+
+		len = sizeof(Src);
+		Nxt = Dst;
+		Nxt.sin6_port = htons(DUMMY_PORT);
+		if (cmsg != NULL)
+			bcopy(inet6_rthdr_getaddr(cmsg, 1), &Nxt.sin6_addr,
+			      sizeof(Nxt.sin6_addr));
+		if ((dummy = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) {
+			perror("socket") ;
+		}
+		if(-1 == connect(dummy, (struct sockaddr *)&Nxt, sizeof(Nxt)))
+			perror("connect");
+		if(-1 == getsockname(dummy, (struct sockaddr *)src, &len)) {
+			perror("getsockname");
+			printf("%d\n", errno);
+		}
+		close(dummy) ;
+	}
+	ident = (getpid() & 0xffff) | 0x8000;
+	Src.sin6_family = AF_INET6;
+	Src.sin6_port = htons(ident);
+	if (bind(sndsock, (struct sockaddr *)src, sizeof(Src))  < 0){
+		perror ("traceroute6: bind:");
+		exit (1);
+	}
+
+	/*
+	 * Message to users
+	 */
+	Fprintf(stderr, "traceroute to %s (%s)", hostname,
+		inet_ntop(AF_INET6, &Dst.sin6_addr,
+			  ntop_buf, sizeof(ntop_buf)));
+	if (source)
+		Fprintf(stderr, " from %s", source);
+	Fprintf(stderr, ", %d hops max, %d byte packets\n", max_hops, datalen);
+	(void) fflush(stderr);
+
+	/*
+	 * Main loop
+	 */
+	for (hops = 1; hops <= max_hops; ++hops) {
+		struct in6_addr lastaddr;
+		int got_there = 0;
+		int unreachable = 0;
+
+		Printf("%2d ", hops);
+		bzero(&lastaddr, sizeof(lastaddr));
+		for (probe = 0; probe < nprobes; ++probe) {
+			int cc;
+			struct timeval t1, t2;
+			struct timezone tz;
+
+			(void) gettimeofday(&t1, &tz);
+			send_probe(++seq, hops);
+			while ((cc = wait_for_reply(rcvsock, &rcvmhdr))) {
+				(void) gettimeofday(&t2, &tz);
+				if ((i = packet_ok(&rcvmhdr, cc, seq))) {
+					if (! IN6_ARE_ADDR_EQUAL(&Rcv.sin6_addr,
+							    &lastaddr)) {
+						print(&rcvmhdr, cc);
+						lastaddr = Rcv.sin6_addr;
+					}
+					Printf("  %g ms", deltaT(&t1, &t2));
+					switch(i - 1) {
+					case ICMP6_DST_UNREACH_NOROUTE:
+						++unreachable;
+						Printf(" !N");
+						break;
+					case ICMP6_DST_UNREACH_ADMIN:
+						++unreachable;
+						Printf(" !P");
+						break;
+					case ICMP6_DST_UNREACH_NOTNEIGHBOR:
+						++unreachable;
+						Printf(" !S");
+						break;
+					case ICMP6_DST_UNREACH_ADDR:
+						++unreachable;
+						Printf(" !A");
+						break;
+					case ICMP6_DST_UNREACH_NOPORT:
+						if (rcvhlim >= 0 &&
+						    rcvhlim <= 1)
+							Printf(" !");
+						++got_there;
+						break;
+					}
+					break;
+				}
+			}
+			if (cc == 0)
+				Printf(" *");
+			(void) fflush(stdout);
+		}
+		putchar('\n');
+		if (got_there ||
+		    (unreachable > 0 && unreachable >= ((nprobes + 1) / 2))) {
+			exit(0);
+		}
+	}
+
+	exit(0);
+}
+
+int
+wait_for_reply(sock, mhdr)
+	int sock;
+	struct msghdr *mhdr;
+{
+	fd_set fds;
+	struct timeval wait;
+	int cc = 0;
+
+	FD_ZERO(&fds);
+	FD_SET(sock, &fds);
+	wait.tv_sec = waittime; wait.tv_usec = 0;
+
+	if (select(sock+1, &fds, (fd_set *)0, (fd_set *)0, &wait) > 0)
+		cc = recvmsg(rcvsock, mhdr, 0);
+
+	return(cc);
+}
+
+#ifdef IPSEC
+#ifdef IPSEC_POLICY_IPSEC
+int
+setpolicy(so, policy)
+	int so;
+	char *policy;
+{
+	char *buf;
+
+	buf = ipsec_set_policy(policy, strlen(policy));
+	if (buf == NULL) {
+		warnx(ipsec_strerror());
+		return -1;
+	}
+	(void)setsockopt(so, IPPROTO_IPV6, IPV6_IPSEC_POLICY,
+		buf, ipsec_get_policylen(buf));
+
+	free(buf);
+
+	return 0;
+}
+#endif
+#endif
+
+void
+send_probe(seq, hops)
+	int seq, hops;
+{
+	struct opacket *op = outpacket;
+	int i;
+
+	if(setsockopt(sndsock, IPPROTO_IPV6, IPV6_UNICAST_HOPS,
+		      (char *)&hops, sizeof(hops)) < 0) {
+		perror("setsockopt IPV6_UNICAST_HOPS");
+	}
+
+	Dst.sin6_port = htons(port + seq);
+
+	op->seq = seq;
+	op->hops = hops;
+	(void) gettimeofday(&op->tv, &tz);
+
+	i = sendto(sndsock, (char *)outpacket, datalen , 0,
+		   (struct sockaddr *)dst, sizeof(Dst));
+	if (i < 0 || i != datalen)  {
+		if (i<0)
+			perror("sendto");
+		Printf("traceroute6: wrote %s %d chars, ret=%d\n", hostname,
+		       datalen, i);
+		(void) fflush(stdout);
+	}
+}
+
+int
+get_hoplim(mhdr)
+	struct msghdr *mhdr;
+{
+	struct cmsghdr *cm;
+
+	for (cm = (struct cmsghdr *)CMSG_FIRSTHDR(mhdr); cm;
+	     cm = (struct cmsghdr *)CMSG_NXTHDR(mhdr, cm)) {
+		if (cm->cmsg_level == IPPROTO_IPV6 &&
+		    cm->cmsg_type == IPV6_HOPLIMIT &&
+		    cm->cmsg_len == CMSG_LEN(sizeof(int)))
+			return(*(int *)CMSG_DATA(cm));
+	}
+
+	return(-1);
+}
+
+double
+deltaT(t1p, t2p)
+	struct timeval *t1p, *t2p;
+{
+	register double dt;
+
+	dt = (double)(t2p->tv_sec - t1p->tv_sec) * 1000.0 +
+	     (double)(t2p->tv_usec - t1p->tv_usec) / 1000.0;
+	return (dt);
+}
+
+
+/*
+ * Convert an ICMP "type" field to a printable string.
+ */
+char *
+pr_type(t0)
+	int t0;
+{
+	u_char t = t0 & 0xff;
+	char *cp;
+
+	switch (t) {
+	case ICMP6_DST_UNREACH:
+		cp = "Destination Unreachable";
+		break;
+	case ICMP6_PACKET_TOO_BIG:
+		cp = "Pakcet Too Big";
+		break;
+	case ICMP6_TIME_EXCEEDED:
+		cp = "Time Exceeded";
+		break;
+	case ICMP6_PARAM_PROB:
+		cp = "Parameter Problem";
+		break;
+	case ICMP6_ECHO_REQUEST:
+		cp = "Echo Request";
+		break;
+	case ICMP6_ECHO_REPLY:
+		cp = "Echo Reply";
+		break;
+	case ICMP6_MEMBERSHIP_QUERY:
+		cp = "Group Membership Query";
+		break;
+	case ICMP6_MEMBERSHIP_REPORT:
+		cp = "Group Membership Report";
+		break;
+	case ICMP6_MEMBERSHIP_REDUCTION:
+		cp = "Group Membership Reduction";
+		break;
+	case ND_ROUTER_SOLICIT:
+		cp = "Router Solicitation";
+		break;
+	case ND_ROUTER_ADVERT:
+		cp = "Router Advertisement";
+		break;
+	case ND_NEIGHBOR_SOLICIT:
+		cp = "Neighbor Solicitation";
+		break;
+	case ND_NEIGHBOR_ADVERT:
+		cp = "Neighbor Advertisement";
+		break;
+	case ND_REDIRECT:
+		cp = "Ridirect";
+		break;
+	default:
+		cp = "Unknown";
+		break;
+	}
+	return cp;
+}
+
+
+int
+packet_ok(mhdr, cc, seq)
+	struct msghdr *mhdr;
+	int cc;
+	int seq;
+{
+	register struct icmp6_hdr *icp;
+	struct sockaddr_in6 *from = (struct sockaddr_in6 *)mhdr->msg_name;
+	u_char type, code;
+	char *buf = (char *)mhdr->msg_iov[0].iov_base;
+	struct cmsghdr *cm;
+	int *hlimp;
+
+#ifdef OLDRAWSOCKET
+	int hlen;
+	struct ip6_hdr *ip;
+#endif
+
+#ifdef OLDRAWSOCKET
+	ip = (struct ip6_hdr *) buf;
+	hlen = sizeof(struct ip6_hdr);
+	if (cc < hlen + sizeof(struct icmp6_hdr)) {
+		if (verbose)
+			Printf("packet too short (%d bytes) from %s\n", cc,
+				inet_ntop(AF_INET6, &from->sin6_addr,
+					   ntop_buf, sizeof(ntop_buf)));
+		return (0);
+	}
+	cc -= hlen;
+	icp = (struct icmp6_hdr *)(buf + hlen);
+#else
+	if (cc < sizeof(struct icmp6_hdr)) {
+		if (verbose)
+			Printf("data too short (%d bytes) from %s\n", cc,
+			       inet_ntop(AF_INET6, &from->sin6_addr,
+					 ntop_buf, sizeof(ntop_buf)));
+		return(0);
+	}
+	icp = (struct icmp6_hdr *)buf;
+#endif
+	/* get optional information via advanced API */
+	rcvpktinfo = NULL;
+	hlimp = NULL;
+	for (cm = (struct cmsghdr *)CMSG_FIRSTHDR(mhdr); cm;
+	     cm = (struct cmsghdr *)CMSG_NXTHDR(mhdr, cm)) {
+		if (cm->cmsg_level == IPPROTO_IPV6 &&
+		    cm->cmsg_type == IPV6_PKTINFO &&
+		    cm->cmsg_len ==
+		    CMSG_LEN(sizeof(struct in6_pktinfo)))
+			rcvpktinfo = (struct in6_pktinfo *)(CMSG_DATA(cm));
+
+		if (cm->cmsg_level == IPPROTO_IPV6 &&
+		    cm->cmsg_type == IPV6_HOPLIMIT &&
+		    cm->cmsg_len == CMSG_LEN(sizeof(int)))
+			hlimp = (int *)CMSG_DATA(cm);
+	}
+	if (rcvpktinfo == NULL || hlimp == NULL) {
+		warnx("failed to get received hop limit or packet info");
+		return(0);
+	}
+	rcvhlim = *hlimp;
+
+	type = icp->icmp6_type;
+	code = icp->icmp6_code;
+	if ((type == ICMP6_TIME_EXCEEDED && code == ICMP6_TIME_EXCEED_TRANSIT)
+	 || type == ICMP6_DST_UNREACH) {
+		struct ip6_hdr *hip;
+		struct udphdr *up;
+
+		hip = (struct ip6_hdr *)(icp + 1);
+		if ((up = get_udphdr(hip, (u_char *)(buf + cc))) == NULL) {
+			if (verbose)
+				warnx("failed to get upper layer header");
+			return(0);
+		}
+		if (up->uh_sport == htons(ident) &&
+		    up->uh_dport == htons(port+seq))
+			return (type == ICMP6_TIME_EXCEEDED ? -1 : code + 1);
+	}
+	if (verbose) {
+		int i;
+		u_long *lp = (u_long *)(icp + 1);
+		char sbuf[INET6_ADDRSTRLEN+1], dbuf[INET6_ADDRSTRLEN];
+
+		Printf("\n%d bytes from %s to %s", cc,
+			inet_ntop(AF_INET6, &from->sin6_addr,
+				   sbuf, sizeof(sbuf)),
+			inet_ntop(AF_INET6, &rcvpktinfo->ipi6_addr,
+				   dbuf, sizeof(dbuf)));
+		Printf(": icmp type %d (%s) code %d\n", type, pr_type(type),
+		       icp->icmp6_code);
+		for (i = 4; i < cc ; i += sizeof(long))
+			Printf("%2d: %8.8x\n", i, (u_int32_t)ntohl(*lp++));
+	}
+	return(0);
+}
+
+/*
+ * Increment pointer until find the UDP header.
+ */
+struct udphdr *
+get_udphdr(ip6, lim)
+	struct ip6_hdr *ip6;
+	u_char *lim;
+{
+	u_char *cp = (u_char *)ip6, nh;
+	int hlen;
+
+	if (cp + sizeof(*ip6) >= lim)
+		return(NULL);
+
+	nh = ip6->ip6_nxt;
+	cp += sizeof(struct ip6_hdr);
+
+	while(lim - cp >= 8) {
+		switch(nh) {
+		 case IPPROTO_ESP:
+		 case IPPROTO_TCP:
+		 case IPPROTO_ICMPV6:
+			 return(NULL);
+		 case IPPROTO_UDP:
+			 return((struct udphdr *)cp);
+		 case IPPROTO_FRAGMENT:
+			 hlen = sizeof(struct ip6_frag);
+			 nh = ((struct ip6_frag *)cp)->ip6f_nxt;
+			 break;
+		 case IPPROTO_AH:
+			 hlen = (((struct ip6_ext *)cp)->ip6e_len + 2) << 2;
+			 nh = ((struct ip6_ext *)cp)->ip6e_nxt;
+			 break;
+		  default:
+			  hlen = (((struct ip6_ext *)cp)->ip6e_len + 1) << 3;
+			  nh = ((struct ip6_ext *)cp)->ip6e_nxt;
+			  break;
+		}
+
+		cp += hlen;
+	}
+
+	return(NULL);
+}
+
+void
+print(mhdr, cc)
+	struct msghdr *mhdr;
+	int cc;
+{
+	struct sockaddr_in6 *from = (struct sockaddr_in6 *)mhdr->msg_name;
+
+	if (nflag) {
+		Printf(" %s", inet_ntop(AF_INET6, &from->sin6_addr,
+					 ntop_buf, sizeof(ntop_buf)));
+	}
+	else if (lflag) {
+		Printf(" %s (%s)", inetname(&from->sin6_addr),
+		       inet_ntop(AF_INET6, &from->sin6_addr,
+				  ntop_buf, sizeof(ntop_buf)));
+	}
+	else {
+		Printf(" %s", inetname(&from->sin6_addr));
+	}
+
+	if (verbose) {
+#ifdef OLDRAWSOCKET
+		Printf(" %d bytes to %s", cc,
+		       inet_ntop(AF_INET6, &rcvpktinfo->ipi6_addr,
+				 ntop_buf, sizeof(ntop_buf)));
+#else
+		Printf(" %d bytes of data to %s", cc,
+		       inet_ntop(AF_INET6, &rcvpktinfo->ipi6_addr,
+				 ntop_buf, sizeof(ntop_buf)));
+#endif
+	}
+}
+
+/*
+ * Subtract 2 timeval structs:  out = out - in.
+ * Out is assumed to be >= in.
+ */
+void
+tvsub(out, in)
+	register struct timeval *out, *in;
+{
+	if ((out->tv_usec -= in->tv_usec) < 0)   {
+		out->tv_sec--;
+		out->tv_usec += 1000000;
+	}
+	out->tv_sec -= in->tv_sec;
+}
+
+
+/*
+ * Construct an Internet address representation.
+ * If the nflag has been supplied, give
+ * numeric value, otherwise try for symbolic name.
+ */
+char *
+inetname(in)
+	struct in6_addr *in;
+{
+	register char *cp;
+	static char line[50];
+	struct hostent *hp;
+	static char domain[MAXHOSTNAMELEN + 1];
+	static int first = 1;
+
+	if (first && !nflag) {
+		first = 0;
+		if (gethostname(domain, MAXHOSTNAMELEN) == 0 &&
+		    (cp = index(domain, '.')))
+			(void) strcpy(domain, cp + 1);
+		else
+			domain[0] = 0;
+	}
+	cp = 0;
+	if (!nflag) {
+		/* hp = (struct hostent *)addr2hostname(in, sizeof(*in), AF_INET6, &herr); */
+	  hp = (struct hostent *)gethostbyaddr((const char *)in, sizeof(*in), AF_INET6);
+		if (hp) {
+			if ((cp = index(hp->h_name, '.')) &&
+			    !strcmp(cp + 1, domain))
+				*cp = 0;
+			cp = hp->h_name;
+			freehostent(hp);
+		}
+	}
+	if (cp)
+		(void) strcpy(line, cp);
+	else {
+		(void)inet_ntop(AF_INET6, in, line, sizeof(line));
+	}
+	return (line);
+}
+
+void
+usage()
+{
+	(void)fprintf(stderr,
+"usage: traceroute6 [-dlnrv] [-m max_hops] [-p port#] [-q nqueries]\n\t\
+[-s src_addr] [-g gateway] [-w wait] host [data size]\n");
+	exit(1);
+}