1#!/bin/ksh 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# Copyright 2008 Sun Microsystems, Inc. All rights reserved. 24# Use is subject to license terms. 25 26# 27# xVM PV domU IP address reporting agent. Reports IP address back to dom0. 28# 29 30interval=$1 31 32xs_ipaddr_path="ipaddr/0" 33xs_link_path="device-misc/vif/default-link" 34link="" 35 36# 37# Look for a valid-seeming address for the given link. Return 0 on success. 38# 39link_to_addr() 40{ 41 tmp=`netstat -I $1 -in | awk '{print $4}' | grep -v Address`; 42 if [ -z "$tmp" ] || [ "$tmp" = "0.0.0.0" ]; 43 then 44 addr="(none)"; 45 return 1; 46 fi 47 48 addr=$tmp; 49 return 0; 50} 51 52default_link() 53{ 54 # 55 # Look in the store for a cached link name. 56 # 57 link=`/usr/lib/xen/bin/xenstore-read $xs_link_path 2>/dev/null` 58 if [ -z "$link" ] || [ "$link" = "(none)" ] 59 then 60 # 61 # If it's not there, try to determine what it is 62 # and add it to the store. 63 determine_default_link 64 fi 65} 66 67# 68# Determine the default link name and update xenstore with the details. 69# 70determine_default_link() 71{ 72 link="(none)"; 73 # 74 # Choose the first up, non-loopback interface with a valid-looking 75 # IP address. 76 # 77 dladm show-link -p -o link,state | while IFS=: read LINKNAME STATE; 78 do 79 if [ "$STATE" = "up" ]; 80 then 81 link_to_addr "$LINKNAME" 82 if [ $? -eq 0 ]; then link=$LINKNAME; break; fi 83 fi 84 85 done 86 87 /usr/lib/xen/bin/xenstore-write $xs_link_path $link 88} 89 90while true; do 91 92 # 93 # Determine the default link in use by this domU. 94 # 95 default_link; 96 97 # 98 # If the link still has a valid-looking IP address, notify dom0 of its 99 # address. 100 # 101 link_to_addr $link 102 if [ $? -ne 0 ] 103 then 104 # 105 # An address could not be determined for the currently cached 106 # default link so determine it again in case it has changed. 107 # We'll still sleep this iteration to rate-limit dladm calls. 108 # 109 determine_default_link; 110 fi 111 112 /usr/lib/xen/bin/xenstore-write $xs_ipaddr_path $addr 113 114 sleep $interval 115done 116 117