248 lines
7.6 KiB
Bash
Executable File
248 lines
7.6 KiB
Bash
Executable File
#!/bin/sh
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set -e
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usage() {
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echo "Usage:"
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echo "weave launch <ipaddr>/<subnet> [-passwd <passwd>] <peer_host> ..."
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echo "weave run <ipaddr>/<subnet> <docker run args> ..."
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echo "weave expose <ipaddr>/<subnet>"
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echo "weave hide <ipaddr>/<subnet>"
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echo "weave status"
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echo "weave version"
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echo "weave stop"
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echo "weave reset"
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exit 1
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}
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# utility function to check whether a command can be executed by the shell
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# see http://stackoverflow.com/questions/592620/how-to-check-if-a-program-exists-from-a-bash-script
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command_exists () {
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command -v $1 >/dev/null 2>&1
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}
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[ `id -u` = 0 ] || {
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echo "weave must be run as 'root'"
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exit 1
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}
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[ $# -gt 0 ] || usage
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BRIDGE=weave
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CONTAINER_IFNAME=ethwe
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MTU=65535
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COMMAND=$1
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shift 1
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check_command_and_run() {
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if command_exists $1
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then
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shift 1
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"$@"
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else
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echo "Cannot find $1; please install it. Continuing without it." >&2
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fi
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}
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create_bridge() {
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[ ! -d /sys/class/net/$BRIDGE ] && {
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ip link add dev $BRIDGE type bridge
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ip link set dev $BRIDGE address 7a:$(od -txC -An -N5 /dev/random | tr \ : | tail -c+2)
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# Attempting to set the bridge MTU to a high value directly
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# fails. Bridges take the lowest MTU of their interfaces. So
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# instead we create a temporary interface with the desired
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# MTU, attach that to the bridge, and then remove it again.
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ip link add name v${CONTAINER_IFNAME}du mtu $MTU type dummy
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ip link set dev v${CONTAINER_IFNAME}du master $BRIDGE
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ip link del dev v${CONTAINER_IFNAME}du
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# disable offloading
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check_command_and_run ethtool ethtool -K $BRIDGE tx off >/dev/null
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}
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ip link set dev $BRIDGE up
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}
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destroy_bridge() {
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if [ -d /sys/class/net/$BRIDGE ] ; then
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ip link del dev $BRIDGE
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fi
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}
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run_iptables() {
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# -w is recent addition to iptables
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if [ -z "$CHECKED_IPTABLES_W" ] ; then
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if iptables -S -w >/dev/null 2>&1 ; then
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IPTABLES_W=-w
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fi
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CHECKED_IPTABLES_W=1
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fi
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iptables $IPTABLES_W "$@"
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}
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add_nat_rule() {
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if ! run_iptables -t nat -C "$@" >/dev/null 2>&1
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then
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run_iptables -t nat -A "$@" >/dev/null
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fi
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}
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setup_masquerading() {
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run_iptables -t nat -N WEAVE >/dev/null 2>&1 || true
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add_nat_rule POSTROUTING -j WEAVE
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add_nat_rule WEAVE -o $BRIDGE ! -s $1 -j MASQUERADE
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add_nat_rule WEAVE -s $1 ! -o $BRIDGE -j MASQUERADE
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}
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stop_masquerading() {
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run_iptables -t nat -F WEAVE >/dev/null 2>&1 || true
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run_iptables -t nat -D POSTROUTING -j WEAVE >/dev/null 2>&1 || true
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run_iptables -t nat -X WEAVE >/dev/null 2>&1 || true
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}
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# the following borrows from https://github.com/jpetazzo/pipework
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configure_container_networking() {
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DOCKERPID=$(docker inspect --format='{{ .State.Pid }}' $1)
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[ "$DOCKERPID" = 0 ] && {
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echo "Docker inspect returned invalid PID 0"
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exit 1
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}
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[ "$DOCKERPID" = "<no value>" ] && {
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echo "Container $1 unknown to Docker."
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exit 1
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}
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NSPID=$DOCKERPID
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[ ! -d /var/run/netns ] && mkdir -p /var/run/netns
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[ -f /var/run/netns/$NSPID ] && rm -f /var/run/netns/$NSPID
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ln -s /proc/$NSPID/ns/net /var/run/netns/$NSPID
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LOCAL_IFNAME="v${CONTAINER_IFNAME}pl${NSPID}"
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GUEST_IFNAME="v${CONTAINER_IFNAME}pg${NSPID}"
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ip link add name $LOCAL_IFNAME mtu $MTU type veth peer name $GUEST_IFNAME mtu $MTU
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ip link set $LOCAL_IFNAME master $BRIDGE
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ip link set $LOCAL_IFNAME up
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ip link set $GUEST_IFNAME netns $NSPID
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ip netns exec $NSPID ip link set $GUEST_IFNAME name $CONTAINER_IFNAME
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ip netns exec $NSPID ip addr add $2 dev $CONTAINER_IFNAME
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ip netns exec $NSPID ip link set $CONTAINER_IFNAME up
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check_command_and_run ethtool ip netns exec $NSPID ethtool -K $3 tx off >/dev/null
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[ -f /var/run/netns/$NSPID ] && rm -f /var/run/netns/$NSPID
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}
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case "$COMMAND" in
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launch)
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[ $# -gt 0 ] || usage
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IPADDR=$1
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shift 1
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case $(docker inspect --format '{{ .State.Running }} {{ .Config.Image }}' weave 2>/dev/null) in
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"true zettio/weave")
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echo "Weave is already running." >&2
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exit 1
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;;
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"false zettio/weave")
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docker rm weave >/dev/null
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;;
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true*)
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echo "Found another running container named 'weave'. Aborting." >&2
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exit 1
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;;
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false*)
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echo "Found another container named 'weave'. Aborting." >&2
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exit 1
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;;
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esac
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create_bridge
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stop_masquerading
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setup_masquerading $IPADDR
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# We set the router name to the bridge mac since that is
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# stable across re-creations of the containers.
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#
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# TODO use the mac of one of the physical host interfaces
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# (eth0, wlan0, etc) so the name becomes stable across host
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# restarts.
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MACADDR=`cat /sys/class/net/$BRIDGE/address`
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CONTAINER=$(docker run --privileged -d --name=weave -p 6783:6783/tcp -p 6783:6783/udp $WEAVE_DOCKER_ARGS zettio/weave -name $MACADDR "$@")
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configure_container_networking $CONTAINER $IPADDR eth0
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echo $CONTAINER
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;;
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status)
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if ! DOCKERIP=$(docker inspect --format='{{ .NetworkSettings.IPAddress }}' weave 2>/dev/null) ; then
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echo "Weave is not running." >&2
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exit 1
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fi
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if [ -z "$DOCKERIP" ] ; then
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echo "Weave is not running." >&2
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exit 1
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fi
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if command_exists wget ; then
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wget -O - -q $DOCKERIP:6784/status
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elif command_exists curl ; then
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curl $DOCKERIP:6784/status
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else
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echo "Cannot find wget or curl. Install one of them for 'weave status' to function." >&2
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exit 1
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fi
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;;
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version)
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# Try the running container first; if no luck try the image
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if ! DOCKERIMAGE=$(docker inspect --format='{{ .Image }}' weave 2>/dev/null) ; then
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if ! DOCKERIMAGE=$(docker inspect --format='{{ .Id }}' zettio/weave 2>/dev/null) ; then
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echo "Unable to find zettio/weave image." >&2
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exit 1
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fi
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fi
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docker images --no-trunc | grep $DOCKERIMAGE | grep -v latest | tr -s ' ' | cut -d ' ' -f 2
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;;
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run)
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[ $# -gt 0 ] || usage
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IPADDR=$1
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shift 1
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create_bridge
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CONTAINER=$(docker run -d "$@")
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configure_container_networking $CONTAINER $IPADDR $CONTAINER_IFNAME
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echo $CONTAINER
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;;
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expose)
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[ $# -gt 0 ] || usage
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IPADDR=$1
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shift 1
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create_bridge
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if ! ip addr list dev $BRIDGE | grep -qF $IPADDR
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then
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ip addr add dev $BRIDGE $IPADDR
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fi
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;;
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hide)
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[ $# -gt 0 ] || usage
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IPADDR=$1
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shift 1
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create_bridge
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if ip addr list dev $BRIDGE | grep -qF $IPADDR
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then
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ip addr del dev $BRIDGE $IPADDR
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fi
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;;
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stop)
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if ! docker kill weave >/dev/null 2>&1 ; then
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echo "Weave is not running."
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fi
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docker rm -f weave >/dev/null 2>&1 || true
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check_command_and_run conntrack conntrack -D -p udp --dport 6783 >/dev/null 2>&1 || true
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stop_masquerading
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;;
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reset)
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docker kill weave >/dev/null 2>&1 || true
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docker rm -f weave >/dev/null 2>&1 || true
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check_command_and_run conntrack conntrack -D -p udp --dport 6783 >/dev/null 2>&1 || true
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stop_masquerading
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destroy_bridge
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;;
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*)
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echo "Unknown weave command '$COMMAND'"
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usage
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;;
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esac
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