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125 lines
2.7 KiB
125 lines
2.7 KiB
#!/bin/bash
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#============================================================================
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# Default Xen network start/stop script when using NAT.
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# Xend calls a network script when it starts.
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# The script name to use is defined in ${XEN_CONFIG_DIR}/xend-config.sxp
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# in the network-script field.
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#
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# Usage:
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#
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# network-nat (start|stop|status) {VAR=VAL}*
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#
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# Vars:
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#
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# netdev The gateway interface (default eth0).
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# antispoof Whether to use iptables to prevent spoofing (default no).
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# dhcp Whether to alter the local DHCP configuration (default no).
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#
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#============================================================================
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dir=$(dirname "$0")
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. "$dir/hotplugpath.sh"
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. "$dir/xen-script-common.sh"
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. "$dir/xen-network-common.sh"
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findCommand "$@"
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evalVariables "$@"
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netdev=${netdev:-eth0}
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# antispoofing not yet implemented
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antispoof=${antispoof:-no}
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# turn on dhcp feature by default if dhcpd is installed
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if [ -f /etc/dhcpd.conf ]
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then
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dhcp=${dhcp:-yes}
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else
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dhcp=${dhcp:-no}
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fi
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if [ "$dhcp" != 'no' ]
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then
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dhcpd_conf_file=$(find_dhcpd_conf_file)
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dhcpd_init_file=$(find_dhcpd_init_file)
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if [ -z "$dhcpd_conf_file" ] || [ -z "$dhcpd_init_file" ]
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then
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echo 'Failed to find dhcpd configuration or init file.' >&2
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exit 1
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fi
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fi
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domain_name=`cat /etc/resolv.conf | grep -v "#" | grep -E 'search|domain' -i | tail -n 1 | awk '{ print $2 }'`
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nameserver=`cat /etc/resolv.conf | grep -v "#" | grep "nameserver" -i -m 1 | awk '{ print $2 }'`
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function dhcp_start()
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{
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if ! grep -q "subnet 10.0.0.0" "$dhcpd_conf_file"
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then
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echo >>"$dhcpd_conf_file" "subnet 10.0.0.0 netmask 255.255.0.0 {\
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option domain-name \"$domain_name\";\
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option domain-name-servers $nameserver; }"
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fi
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"$dhcpd_init_file" restart
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}
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function dhcp_stop()
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{
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local tmpfile=$(mktemp)
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grep -v "subnet 10.0.0.0" "$dhcpd_conf_file" >"$tmpfile"
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if diff "$tmpfile" "$dhcpd_conf_file" >&/dev/null
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then
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rm "$tmpfile"
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else
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mv "$tmpfile" "$dhcpd_conf_file"
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fi
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"$dhcpd_init_file" restart
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}
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op_start() {
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echo 1 >/proc/sys/net/ipv4/ip_forward
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iptables -t nat -A POSTROUTING -o ${netdev} -j MASQUERADE
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[ "$dhcp" != 'no' ] && dhcp_start
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}
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op_stop() {
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[ "$dhcp" != 'no' ] && dhcp_stop
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iptables -t nat -D POSTROUTING -o ${netdev} -j MASQUERADE
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}
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show_status() {
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echo '============================================================'
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ifconfig
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echo ' '
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ip route list
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echo ' '
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route -n
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echo '============================================================'
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}
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case "$command" in
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start)
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op_start
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;;
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stop)
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op_stop
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;;
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status)
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show_status
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;;
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*)
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echo "Unknown command: $command" >&2
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echo 'Valid commands are: start, stop, status' >&2
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exit 1
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esac
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