1#!/usr/perl5/bin/perl -w 2# 3# CDDL HEADER START 4# 5# The contents of this file are subject to the terms of the 6# Common Development and Distribution License (the "License"). 7# You may not use this file except in compliance with the License. 8# 9# You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 10# or http://www.opensolaris.org/os/licensing. 11# See the License for the specific language governing permissions 12# and limitations under the License. 13# 14# When distributing Covered Code, include this CDDL HEADER in each 15# file and include the License file at usr/src/OPENSOLARIS.LICENSE. 16# If applicable, add the following below this CDDL HEADER, with the 17# fields enclosed by brackets "[]" replaced with your own identifying 18# information: Portions Copyright [yyyy] [name of copyright owner] 19# 20# CDDL HEADER END 21# 22 23# 24# Copyright 2008 Sun Microsystems, Inc. All rights reserved. 25# Use is subject to license terms. 26# 27 28# 29# get.ipv6remote.pl 30# 31# Find an IPv6 reachable remote host using both ifconfig(8) and ping(8). 32# Print the local address and the remote address, or print nothing if either 33# no IPv6 interfaces or remote hosts were found. (Remote IPv6 testing is 34# considered optional, and so not finding another IPv6 host is not an error 35# state we need to log.) Exit status is 0 if a host was found. 36# 37 38use strict; 39use IO::Socket; 40 41my $MAXHOSTS = 32; # max hosts to scan 42my $TIMEOUT = 3; # connection timeout 43my $MULTICAST = "FF02::1"; # IPv6 multicast address 44 45# 46# Determine local IP address 47# 48my $local = ""; 49my $remote = ""; 50my %Local; 51my $up; 52open IFCONFIG, '/usr/sbin/ifconfig -a inet6 |' 53 or die "Couldn't run ifconfig: $!\n"; 54while (<IFCONFIG>) { 55 next if /^lo/; 56 57 # "UP" is always printed first (see print_flags() in ifconfig.c): 58 $up = 1 if /^[a-z].*<UP,/; 59 $up = 0 if /^[a-z].*<,/; 60 61 # assume output is "inet6 ...": 62 if (m:inet6 (\S+)/:) { 63 my $addr = $1; 64 $Local{$addr} = 1; 65 $local = $addr if $up and $local eq ""; 66 $up = 0; 67 } 68} 69close IFCONFIG; 70exit 1 if $local eq ""; 71 72# 73# Find the first remote host that responds to an icmp echo, 74# which isn't a local address. 75# 76open PING, "/usr/sbin/ping -ns -A inet6 $MULTICAST 56 $MAXHOSTS |" or 77 die "Couldn't run ping: $!\n"; 78while (<PING>) { 79 if (/bytes from (.*): / and not defined $Local{$1}) { 80 $remote = $1; 81 last; 82 } 83} 84close PING; 85exit 2 if $remote eq ""; 86 87print "$local $remote\n"; 88