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193 lines
4.8 KiB
193 lines
4.8 KiB
#!/bin/bash
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#============================================================================
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# ${XEN_SCRIPT_DIR}/vif-nat
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#
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# Script for configuring a vif in routed-nat mode.
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# The hotplugging system will call this script if it is specified either in
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# the device configuration given to Xend, or the default Xend configuration
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# in ${XEN_CONFIG_DIR}/xend-config.sxp. If the script is specified in
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# neither of those places, then vif-bridge is the default.
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#
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# Usage:
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# vif-nat (add|remove|online|offline)
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#
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# Environment vars:
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# dev vif interface name (required).
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# XENBUS_PATH path to this device's details in the XenStore (required).
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#
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# Parameters:
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# dhcp Whether to alter the local DHCP configuration to include this
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# new host (default no).
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#
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# Read from the store:
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# ip list of IP networks for the vif, space-separated (default given in
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# this script).
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#============================================================================
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dir=$(dirname "$0")
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. "$dir/vif-common.sh"
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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=$(find_dhcpd_init_file)
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dhcpd_arg_file=$(find_dhcpd_arg_file)
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if [ -z "$dhcpd_conf_file" ] || [ -z "$dhcpd_init_file" ] || [ -z "$dhcpd_arg_file" ]
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then
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echo 'Failed to find dhcpd configuration or init or args file.' >&2
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exit 1
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fi
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fi
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domid=$(xenstore_read "$XENBUS_PATH/frontend-id")
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vifid=$(xenstore_read "$XENBUS_PATH/handle")
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vifid=$(( $vifid + 1 ))
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ip_from_dom()
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{
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local domid1=$(( $domid / 256 ))
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local domid2=$(( $domid % 256 ))
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echo "10.$domid1.$domid2.$vifid/16"
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}
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routing_ip()
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{
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echo $(echo $1 | awk -F. '{print $1"."$2"."$3"."$4 + 127}')
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}
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dotted_quad()
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{
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echo\
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$(( ($1 & 0xFF000000) >> 24))\
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.$(( ($1 & 0x00FF0000) >> 16))\
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.$(( ($1 & 0x0000FF00) >> 8 ))\
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.$(( $1 & 0x000000FF ))
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}
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if [ "$ip" = "" ]
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then
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ip=$(ip_from_dom)
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fi
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router_ip=$(routing_ip "$ip")
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# Split the given IP/bits pair.
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vif_ip=`echo ${ip} | awk -F/ '{print $1}'`
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hostname=$(xenstore_read "$XENBUS_PATH/domain" | tr -- '_.:/+' '-----')
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if [ "$vifid" != "1" ]
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then
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hostname="$hostname-$vifid"
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fi
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dhcparg_remove_entry()
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{
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local tmpfile=$(mktemp)
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sed -e "s/${dev} //" "$dhcpd_arg_file" >"$tmpfile"
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if diff "$tmpfile" "$dhcpd_arg_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" "$dhcpd_arg_file"
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fi
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}
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dhcparg_add_entry()
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{
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dhcparg_remove_entry
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local tmpfile=$(mktemp)
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# handle Red Hat, SUSE, and Debian styles, with or without quotes
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sed -e 's/^DHCPDARGS="*\([^"]*\)"*/DHCPDARGS="\1'"${dev} "'"/' \
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"$dhcpd_arg_file" >"$tmpfile" && mv "$tmpfile" "$dhcpd_arg_file"
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sed -e 's/^DHCPD_INTERFACE="*\([^"]*\)"*/DHCPD_INTERFACE="\1'"${dev} "'"/' \
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"$dhcpd_arg_file" >"$tmpfile" && mv "$tmpfile" "$dhcpd_arg_file"
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sed -e 's/^INTERFACES="*\([^"]*\)"*/INTERFACES="\1'"${dev} "'"/' \
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"$dhcpd_arg_file" >"$tmpfile" && mv "$tmpfile" "$dhcpd_arg_file"
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rm -f "$tmpfile"
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}
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dhcp_remove_entry()
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{
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local tmpfile=$(mktemp)
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grep -v "host $hostname" "$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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dhcparg_remove_entry
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}
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dhcp_up()
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{
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claim_lock "vif-nat-dhcp"
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dhcp_remove_entry
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mac=$(xenstore_read "$XENBUS_PATH/mac")
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echo >>"$dhcpd_conf_file" \
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"host $hostname { hardware ethernet $mac; fixed-address $vif_ip; option routers $router_ip; option host-name \"$hostname\"; }"
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dhcparg_add_entry
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release_lock "vif-nat-dhcp"
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"$dhcpd_init_file" restart || true
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}
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dhcp_down()
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{
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claim_lock "vif-nat-dhcp"
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dhcp_remove_entry
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release_lock "vif-nat-dhcp"
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"$dhcpd_init_file" restart || true # We need to ignore failure because
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# ISC dhcpd 3 borks if there is nothing
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# for it to do, which is the case if
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# the outgoing interface is not
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# configured to offer leases and there
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# are no vifs.
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}
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case "$command" in
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online)
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if ip route | grep -q "dev ${dev}"
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then
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log debug "${dev} already up"
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exit 0
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fi
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do_or_die ip link set "${dev}" up arp on
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do_or_die ip addr add "$router_ip" dev "${dev}"
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do_or_die ip route add "$vif_ip" dev "${dev}" src "$router_ip"
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echo 1 >/proc/sys/net/ipv4/conf/${dev}/proxy_arp
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[ "$dhcp" != 'no' ] && dhcp_up
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;;
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offline)
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[ "$dhcp" != 'no' ] && dhcp_down
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do_without_error ifconfig "${dev}" down
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;;
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esac
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handle_iptable
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log debug "Successful vif-nat $command for ${dev}."
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if [ "$command" = "online" ]
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then
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success
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fi
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