/etc/xen/scripts/vif-nat is in xen-utils-common 4.1.4-3+deb7u9.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 | #!/bin/bash
#============================================================================
# ${XEN_SCRIPT_DIR}/vif-nat
#
# Script for configuring a vif in routed-nat mode.
# The hotplugging system will call this script if it is specified either in
# the device configuration given to Xend, or the default Xend configuration
# in ${XEN_CONFIG_DIR}/xend-config.sxp. If the script is specified in
# neither of those places, then vif-bridge is the default.
#
# Usage:
# vif-nat (add|remove|online|offline)
#
# Environment vars:
# dev vif interface name (required).
# XENBUS_PATH path to this device's details in the XenStore (required).
#
# Parameters:
# dhcp Whether to alter the local DHCP configuration to include this
# new host (default no).
#
# Read from the store:
# ip list of IP networks for the vif, space-separated (default given in
# this script).
#============================================================================
dir=$(dirname "$0")
. "$dir/vif-common.sh"
# turn on dhcp feature by default if dhcpd is installed
if [ -f /etc/dhcpd.conf ]
then
dhcp=${dhcp:-yes}
else
dhcp=${dhcp:-no}
fi
if [ "$dhcp" != 'no' ]
then
dhcpd_conf_file=$(find_dhcpd_conf_file)
dhcpd_init_file=$(find_dhcpd_init_file)
dhcpd_arg_file=$(find_dhcpd_arg_file)
if [ -z "$dhcpd_conf_file" ] || [ -z "$dhcpd_init_file" ] || [ -z "$dhcpd_arg_file" ]
then
echo 'Failed to find dhcpd configuration or init or args file.' >&2
exit 1
fi
fi
domid=$(xenstore_read "$XENBUS_PATH/frontend-id")
vifid=$(xenstore_read "$XENBUS_PATH/handle")
vifid=$(( $vifid + 1 ))
ip_from_dom()
{
local domid1=$(( $domid / 256 ))
local domid2=$(( $domid % 256 ))
echo "10.$domid1.$domid2.$vifid/16"
}
routing_ip()
{
echo $(echo $1 | awk -F. '{print $1"."$2"."$3"."$4 + 127}')
}
dotted_quad()
{
echo\
$(( ($1 & 0xFF000000) >> 24))\
.$(( ($1 & 0x00FF0000) >> 16))\
.$(( ($1 & 0x0000FF00) >> 8 ))\
.$(( $1 & 0x000000FF ))
}
if [ "$ip" = "" ]
then
ip=$(ip_from_dom)
fi
router_ip=$(routing_ip "$ip")
# Split the given IP/bits pair.
vif_ip=`echo ${ip} | awk -F/ '{print $1}'`
hostname=$(xenstore_read "$XENBUS_PATH/domain" | tr -- '_.:/+' '-----')
if [ "$vifid" != "1" ]
then
hostname="$hostname-$vifid"
fi
dhcparg_remove_entry()
{
local tmpfile=$(mktemp)
sed -e "s/${dev} //" "$dhcpd_arg_file" >"$tmpfile"
if diff "$tmpfile" "$dhcpd_arg_file" >/dev/null
then
rm "$tmpfile"
else
mv "$tmpfile" "$dhcpd_arg_file"
fi
}
dhcparg_add_entry()
{
dhcparg_remove_entry
local tmpfile=$(mktemp)
# handle Red Hat, SUSE, and Debian styles, with or without quotes
sed -e 's/^DHCPDARGS="*\([^"]*\)"*/DHCPDARGS="\1'"${dev} "'"/' \
"$dhcpd_arg_file" >"$tmpfile" && mv "$tmpfile" "$dhcpd_arg_file"
sed -e 's/^DHCPD_INTERFACE="*\([^"]*\)"*/DHCPD_INTERFACE="\1'"${dev} "'"/' \
"$dhcpd_arg_file" >"$tmpfile" && mv "$tmpfile" "$dhcpd_arg_file"
sed -e 's/^INTERFACES="*\([^"]*\)"*/INTERFACES="\1'"${dev} "'"/' \
"$dhcpd_arg_file" >"$tmpfile" && mv "$tmpfile" "$dhcpd_arg_file"
rm -f "$tmpfile"
}
dhcp_remove_entry()
{
local tmpfile=$(mktemp)
grep -v "host $hostname" "$dhcpd_conf_file" >"$tmpfile"
if diff "$tmpfile" "$dhcpd_conf_file" >/dev/null
then
rm "$tmpfile"
else
mv "$tmpfile" "$dhcpd_conf_file"
fi
dhcparg_remove_entry
}
dhcp_up()
{
claim_lock "vif-nat-dhcp"
dhcp_remove_entry
mac=$(xenstore_read "$XENBUS_PATH/mac")
echo >>"$dhcpd_conf_file" \
"host $hostname { hardware ethernet $mac; fixed-address $vif_ip; option routers $router_ip; option host-name \"$hostname\"; }"
dhcparg_add_entry
release_lock "vif-nat-dhcp"
"$dhcpd_init_file" restart || true
}
dhcp_down()
{
claim_lock "vif-nat-dhcp"
dhcp_remove_entry
release_lock "vif-nat-dhcp"
"$dhcpd_init_file" restart || true # We need to ignore failure because
# ISC dhcpd 3 borks if there is nothing
# for it to do, which is the case if
# the outgoing interface is not
# configured to offer leases and there
# are no vifs.
}
case "$command" in
online)
if ip route | grep -q "dev ${dev}"
then
log debug "${dev} already up"
exit 0
fi
do_or_die ip link set "${dev}" up arp on
do_or_die ip addr add "$router_ip" dev "${dev}"
do_or_die ip route add "$vif_ip" dev "${dev}" src "$router_ip"
echo 1 >/proc/sys/net/ipv4/conf/${dev}/proxy_arp
[ "$dhcp" != 'no' ] && dhcp_up
;;
offline)
[ "$dhcp" != 'no' ] && dhcp_down
do_without_error ifconfig "${dev}" down
;;
esac
handle_iptable
log debug "Successful vif-nat $command for ${dev}."
if [ "$command" = "online" ]
then
success
fi
|