/
weave
executable file
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/
weave
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#!/bin/sh
set -e
[ -n "$WEAVE_DEBUG" ] && set -x
SCRIPT_VERSION="unreleased"
IMAGE_VERSION=latest
[ "$SCRIPT_VERSION" = "unreleased" ] || IMAGE_VERSION=$SCRIPT_VERSION
IMAGE_VERSION=${WEAVE_VERSION:-$IMAGE_VERSION}
# - The weavexec image embeds a Docker 1.10.3 client. Docker will give
# a "client is newer than server error" if the daemon has an older
# API version, which could be confusing if the user's Docker client
# is correctly matched with that older version.
#
# We therefore check that the user's Docker *client* is >= 1.10.3
MIN_DOCKER_VERSION=1.10.0
# These are needed for remote execs, hence we introduce them here
DOCKERHUB_USER=${DOCKERHUB_USER:-weaveworks}
BASE_EXEC_IMAGE=$DOCKERHUB_USER/weaveexec
EXEC_IMAGE=$BASE_EXEC_IMAGE:$IMAGE_VERSION
WEAVEDB_IMAGE=$DOCKERHUB_USER/weavedb
PROXY_HOST=${PROXY_HOST:-$(echo "${DOCKER_HOST#tcp://}" | cut -s -d: -f1)}
PROXY_HOST=${PROXY_HOST:-127.0.0.1}
DOCKER_CLIENT_HOST=${DOCKER_CLIENT_HOST:-$DOCKER_HOST}
# Define some regular expressions for matching addresses.
# The regexp here is far from precise, but good enough.
IP_REGEXP="[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}"
CIDR_REGEXP="$IP_REGEXP/[0-9]{1,2}"
######################################################################
# helpers that run locally, even without --local
######################################################################
usage_no_exit() {
cat >&2 <<EOF
Usage:
weave --help | help
setup
version
weave launch [--password <pass>] [--trusted-subnets <cidr>,...]
[--host <ip_address>]
[--name <mac>] [--nickname <nickname>]
[--no-restart] [--resume] [--no-discovery] [--no-dns]
[--ipalloc-init <mode>]
[--ipalloc-range <cidr> [--ipalloc-default-subnet <cidr>]]
[--plugin=false] [--proxy=false]
[-H <endpoint>] [--without-dns] [--no-multicast-route]
[--no-rewrite-hosts] [--no-default-ipalloc]
[--hostname-from-label <labelkey>]
[--hostname-match <regexp>]
[--hostname-replacement <replacement>]
[--rewrite-inspect]
[--log-level=debug|info|warning|error]
<peer> ...
weave prime
weave env [--restore]
config
dns-args
weave connect [--replace] [<peer> ...]
forget <peer> ...
weave attach [--without-dns] [--rewrite-hosts] [--no-multicast-route]
[<addr> ...] <container_id>
detach [<addr> ...] <container_id>
weave expose [<addr> ...] [-h <fqdn>]
hide [<addr> ...]
weave dns-add [<ip_address> ...] <container_id> [-h <fqdn>] |
<ip_address> ... -h <fqdn>
dns-remove [<ip_address> ...] <container_id> [-h <fqdn>] |
<ip_address> ... -h <fqdn>
dns-lookup <unqualified_name>
weave status [targets | connections | peers | dns | ipam]
report [-f <format>]
ps [<container_id> ...]
weave stop
weave reset [--force]
rmpeer <peer_id> ...
where <peer> = <ip_address_or_fqdn>[:<port>]
<cidr> = <ip_address>/<routing_prefix_length>
<addr> = [ip:]<cidr> | net:<cidr> | net:default
<endpoint> = [tcp://][<ip_address>]:<port> | [unix://]/path/to/socket
<peer_id> = <nickname> | <weave internal peer ID>
<mode> = consensus[=<count>] | seed=<mac>,... | observer
To troubleshoot and visualize Weave networks, try Weave Cloud: http://www.weave.works/product/cloud/
EOF
}
usage() {
usage_no_exit
exit 1
}
handle_help_arg() {
if [ "$1" = "--help" ] ; then
usage_no_exit
exit 0
fi
}
docker_sock_options() {
# Pass through DOCKER_HOST if it is a Unix socket;
# a TCP socket may be secured by TLS, in which case we can't use it
if echo "$DOCKER_HOST" | grep -q "^unix://" >/dev/null; then
echo "-v ${DOCKER_HOST#unix://}:${DOCKER_HOST#unix://} -e DOCKER_HOST"
else
echo "-v /var/run/docker.sock:/var/run/docker.sock"
fi
}
docker_run_options() {
echo --privileged --net=host $(docker_sock_options)
}
exec_options() {
case "$1" in
setup|setup-cni|launch|reset)
echo -v /:/host -e HOST_ROOT=/host
;;
# All the other commands that may create the bridge and need machine id files.
# We don't mount '/' to avoid recursive mounts of '/var'
attach|expose|hide)
echo -v /etc:/host/etc -v /var/lib/dbus:/host/var/lib/dbus -e HOST_ROOT=/host
;;
esac
}
exec_remote() {
docker $DOCKER_CLIENT_ARGS run --rm \
$(docker_run_options) \
--pid=host \
$(exec_options "$@") \
-e DOCKERHUB_USER="$DOCKERHUB_USER" \
-e WEAVE_VERSION \
-e WEAVE_DEBUG \
-e WEAVE_DOCKER_ARGS \
-e WEAVE_PASSWORD \
-e WEAVE_PORT \
-e WEAVE_HTTP_ADDR \
-e WEAVE_STATUS_ADDR \
-e WEAVE_CONTAINER_NAME \
-e WEAVE_MTU \
-e WEAVE_NO_FASTDP \
-e WEAVE_NO_BRIDGED_FASTDP \
-e DOCKER_BRIDGE \
-e DOCKER_CLIENT_HOST="$DOCKER_CLIENT_HOST" \
-e DOCKER_CLIENT_ARGS \
-e PROXY_HOST="$PROXY_HOST" \
-e COVERAGE \
-e CHECKPOINT_DISABLE \
-e AWSVPC \
$WEAVEEXEC_DOCKER_ARGS $EXEC_IMAGE --local "$@"
}
# Given $1 and $2 as semantic version numbers like 3.1.2, return [ $1 < $2 ]
version_lt() {
VERSION_MAJOR=${1%.*.*}
REST=${1%.*} VERSION_MINOR=${REST#*.}
VERSION_PATCH=${1#*.*.}
MIN_VERSION_MAJOR=${2%.*.*}
REST=${2%.*} MIN_VERSION_MINOR=${REST#*.}
MIN_VERSION_PATCH=${2#*.*.}
if [ \( "$VERSION_MAJOR" -lt "$MIN_VERSION_MAJOR" \) -o \
\( "$VERSION_MAJOR" -eq "$MIN_VERSION_MAJOR" -a \
\( "$VERSION_MINOR" -lt "$MIN_VERSION_MINOR" -o \
\( "$VERSION_MINOR" -eq "$MIN_VERSION_MINOR" -a \
\( "$VERSION_PATCH" -lt "$MIN_VERSION_PATCH" \) \) \) \) ] ; then
return 0
fi
return 1
}
check_docker_version() {
if ! DOCKER_VERSION=$(docker -v | sed -n -e 's|^Docker version \([0-9][0-9]*\.[0-9][0-9]*\.[0-9][0-9]*\).*|\1|p') || [ -z "$DOCKER_VERSION" ] ; then
echo "ERROR: Unable to parse docker version" >&2
exit 1
fi
if version_lt $DOCKER_VERSION $MIN_DOCKER_VERSION ; then
echo "ERROR: weave requires Docker version $MIN_DOCKER_VERSION or later; you are running $DOCKER_VERSION" >&2
exit 1
fi
}
is_cidr() {
echo "$1" | grep -E "^$CIDR_REGEXP$" >/dev/null
}
collect_cidr_args() {
CIDR_ARGS=""
CIDR_ARG_COUNT=0
while [ "$1" = "net:default" ] || is_cidr "$1" || is_cidr "${1#ip:}" || is_cidr "${1#net:}" ; do
CIDR_ARGS="$CIDR_ARGS ${1#ip:}"
CIDR_ARG_COUNT=$((CIDR_ARG_COUNT + 1))
shift 1
done
}
kill_container() {
docker kill $1 >/dev/null 2>&1 || true
}
######################################################################
# main
######################################################################
[ "$1" = "--local" ] && shift 1 && IS_LOCAL=1
# "--help|help" are special because we always want to process them
# at the client end.
handle_help_arg "$1" || handle_help_arg "--$1"
if [ "$1" = "version" -a -z "$IS_LOCAL" ] ; then
# non-local "version" is special because we want to show the
# version of the script executed by the user rather than what is
# embedded in weaveexec.
echo "weave script $SCRIPT_VERSION"
elif [ "$1" = "env" -a "$2" = "--restore" ] ; then
# "env --restore" is special because we always want to process it
# at the client end.
if [ "${ORIG_DOCKER_HOST-unset}" = "unset" ] ; then
echo "Nothing to restore. This is most likely because there was no preceding invocation of 'eval \$(weave env)' in this shell." >&2
exit 1
else
echo "DOCKER_HOST=$ORIG_DOCKER_HOST"
exit 0
fi
fi
if [ -z "$IS_LOCAL" ] ; then
check_docker_version
exec_remote "$@"
exit $?
fi
######################################################################
# main (remote and --local) - settings
######################################################################
# Default restart policy for router/proxy
RESTART_POLICY="--restart=always"
BASE_IMAGE=$DOCKERHUB_USER/weave
IMAGE=$BASE_IMAGE:$IMAGE_VERSION
CONTAINER_NAME=${WEAVE_CONTAINER_NAME:-weave}
PLUGIN_NAME="$DOCKERHUB_USER/net-plugin"
OLD_PLUGIN_CONTAINER_NAME=weaveplugin
CNI_PLUGIN_NAME="weave-plugin-$IMAGE_VERSION"
CNI_PLUGIN_DIR=${WEAVE_CNI_PLUGIN_DIR:-$HOST_ROOT/opt/cni/bin}
# Note VOLUMES_CONTAINER which is for weavewait should change when you upgrade Weave
VOLUMES_CONTAINER_NAME=weavevolumes-$IMAGE_VERSION
# DB files should remain when you upgrade, so version number not included in name
DB_CONTAINER_NAME=${CONTAINER_NAME}db
DOCKER_BRIDGE=${DOCKER_BRIDGE:-docker0}
BRIDGE=weave
# This value is overridden when the datapath is used unbridged
DATAPATH=datapath
CONTAINER_IFNAME=ethwe
BRIDGE_IFNAME=v${CONTAINER_IFNAME}-bridge
DATAPATH_IFNAME=v${CONTAINER_IFNAME}-datapath
PORT=${WEAVE_PORT:-6783}
HTTP_ADDR=${WEAVE_HTTP_ADDR:-127.0.0.1:6784}
STATUS_ADDR=${WEAVE_STATUS_ADDR:-127.0.0.1:6782}
PROXY_PORT=12375
OLD_PROXY_CONTAINER_NAME=weaveproxy
PROC_PATH="/proc"
COVERAGE_ARGS=""
[ -n "$COVERAGE" ] && COVERAGE_ARGS="-test.coverprofile=/home/weave/cover.prof --"
######################################################################
# general helpers; independent of docker and weave
######################################################################
# utility function to check whether a command can be executed by the shell
# see http://stackoverflow.com/questions/592620/how-to-check-if-a-program-exists-from-a-bash-script
command_exists() {
command -v $1 >/dev/null 2>&1
}
fractional_sleep() {
case $1 in
*.*)
if [ -z "$NO_FRACTIONAL_SLEEP" ] ; then
sleep $1 >/dev/null 2>&1 && return 0
NO_FRACTIONAL_SLEEP=1
fi
sleep $((${1%.*} + 1))
;;
*)
sleep $1
;;
esac
}
run_iptables() {
# -w is recent addition to iptables
if [ -z "$CHECKED_IPTABLES_W" ] ; then
iptables -S -w >/dev/null 2>&1 && IPTABLES_W=-w
CHECKED_IPTABLES_W=1
fi
iptables $IPTABLES_W "$@"
}
# Insert a rule in iptables, if it doesn't exist already
insert_iptables_rule() {
IPTABLES_TABLE="$1"
shift 1
if ! run_iptables -t $IPTABLES_TABLE -C "$@" >/dev/null 2>&1 ; then
## Loop until we get an exit code other than "temporarily unavailable"
while true ; do
run_iptables -t $IPTABLES_TABLE -I "$@" >/dev/null && return 0
if [ $? != 4 ] ; then
return 1
fi
done
fi
}
# Delete a rule from iptables, if it exist
delete_iptables_rule() {
IPTABLES_TABLE="$1"
shift 1
if run_iptables -t $IPTABLES_TABLE -C "$@" >/dev/null 2>&1 ; then
run_iptables -t $IPTABLES_TABLE -D "$@" >/dev/null
fi
}
# Send out an ARP announcement
# (https://tools.ietf.org/html/rfc5227#page-15) to update ARP cache
# entries across the weave network. We do this in addition to
# configure_arp_cache because a) with those ARP cache settings it
# still takes a few seconds to correct a stale ARP mapping, and b)
# there is a kernel bug that means that the base_reachable_time
# setting is not promptly obeyed
# (<https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=4bf6980dd0328530783fd657c776e3719b421d30>>).
arp_update() {
# It's not the end of the world if this doesn't run - we configure
# ARP caches so that stale entries will be noticed quickly.
! command_exists arping || $3 arping -U -q -I $1 -c 1 ${2%/*}
}
######################################################################
# weave and docker specific helpers
######################################################################
util_op() {
if command_exists weaveutil ; then
weaveutil "$@"
else
docker run --rm --pid=host $(docker_run_options) \
--entrypoint=/usr/bin/weaveutil $EXEC_IMAGE "$@"
fi
}
check_forwarding_rules() {
if run_iptables -C FORWARD -j REJECT --reject-with icmp-host-prohibited > /dev/null 2>&1; then
cat >&2 <<EOF
WARNING: existing iptables rule
'-A FORWARD -j REJECT --reject-with icmp-host-prohibited'
will block name resolution via weaveDNS - please reconfigure your firewall.
EOF
fi
}
# Detect the current bridge/datapath state. When invoked, the values of
# $BRIDGE and $DATAPATH are expected to be distinct. $BRIDGE_TYPE and
# $DATAPATH are set correctly on success; failure indicates that the
# bridge/datapath devices have yet to be configured. If netdevs do exist
# but are in an inconsistent state the script aborts with an error.
detect_bridge_type() {
BRIDGE_TYPE=$(util_op detect-bridge-type "$BRIDGE" "$DATAPATH")
case "$BRIDGE_TYPE" in
bridge|bridged_fastdp)
;;
fastdp)
DATAPATH="$BRIDGE"
;;
*)
return 1
;;
esac
# WEAVE_MTU may have been specified when the bridge was
# created (perhaps implicitly with WEAVE_NO_FASTDP). So take
# the MTU from the bridge unless it is explicitly specified
# for this invocation.
MTU=${WEAVE_MTU:-$(cat /sys/class/net/$BRIDGE/mtu)}
}
try_create_bridge() {
# Running this from 'weave --local' when weaveexec is not on the
# path will run it as a Docker container that does not have access
# to /etc/machine-id, so will not give the full range of persistent IDs
if [ -z "$WEAVEDB_DIR_PATH" ]; then
WEAVEDB_DIR_PATH="$HOST_ROOT/$(docker inspect -f '{{with index .Mounts 0}}{{.Source}}{{end}}' $DB_CONTAINER_NAME 2>/dev/null)"
fi
MAC=$(util_op unique-id "$WEAVEDB_DIR_PATH/weave" "$HOST_ROOT")
BRIDGE_TYPE=$(util_op create-bridge "$DOCKER_BRIDGE" "$BRIDGE" "$DATAPATH" "$WEAVE_MTU" "$PORT" "$MAC" "$WEAVE_NO_FASTDP" "$WEAVE_NO_BRIDGED_FASTDP" "$PROC_PATH" "$1")
# Set some variables that are expected by code that comes later
[ "$BRIDGE_TYPE" != "fastdp" ] || DATAPATH="$BRIDGE"
MTU=${WEAVE_MTU:-$(cat /sys/class/net/$BRIDGE/mtu)}
}
create_bridge() {
validate_bridge_type
if ! try_create_bridge "$@" ; then
echo "Creating bridge '$BRIDGE' failed" >&2
# reset to original value so we destroy both kinds
DATAPATH=datapath
destroy_bridge
exit 1
fi
}
validate_bridge_type() {
detect_bridge_type || return 0
if [ -n "$LAUNCHING_ROUTER" ] ; then
if [ "$BRIDGE_TYPE" = bridge -a -z "$WEAVE_NO_FASTDP" ] &&
util_op check-datapath 2>/dev/null ; then
cat <<EOF >&2
WEAVE_NO_FASTDP is not set, but there is already a bridge present of
the wrong type for fast datapath. Please do 'weave reset' to remove
the bridge first.
EOF
return 1
fi
if [ "$BRIDGE_TYPE" != bridge -a -n "$WEAVE_NO_FASTDP" ] ; then
cat <<EOF >&2
WEAVE_NO_FASTDP is set, but there is already a weave fast datapath
bridge present. Please do 'weave reset' to remove the bridge first.
EOF
return 1
fi
fi
}
expose_ip() {
ipam_cidrs allocate_no_check_alive weave:expose $CIDR_ARGS
for CIDR in $ALL_CIDRS ; do
if ! ip addr show dev $BRIDGE | grep -qF $CIDR ; then
ip addr add dev $BRIDGE $CIDR
arp_update $BRIDGE $CIDR || true
fi
[ -z "$FQDN" ] || when_weave_running put_dns_fqdn_no_check_alive weave:expose $FQDN $CIDR
done
}
# create veth with ends $1-$2, and then invoke $3..., removing the
# veth on failure. No-op of veth already exists.
create_veth() {
VETHL=$1
VETHR=$2
shift 2
ip link show $VETHL >/dev/null 2>&1 && ip link show $VETHR >/dev/null 2>&1 && return 0
ip link add name $VETHL mtu $MTU type veth peer name $VETHR mtu $MTU || return 1
if ! ip link set $VETHL up || ! ip link set $VETHR up || ! "$@" ; then
ip link del $VETHL >/dev/null 2>&1 || true
ip link del $VETHR >/dev/null 2>&1 || true
return 1
fi
}
destroy_bridge() {
# It's important that detect_bridge_type has not been called so
# we have distinct values for $BRIDGE and $DATAPATH. Make best efforts
# to remove netdevs of any type with those names so `weave reset` can
# recover from inconsistent states.
for NETDEV in $BRIDGE $DATAPATH ; do
if [ -d /sys/class/net/$NETDEV ] ; then
if [ -d /sys/class/net/$NETDEV/bridge ] ; then
ip link del $NETDEV
else
util_op delete-datapath $NETDEV
fi
fi
done
# Remove any lingering bridged fastdp, pcap and attach-bridge veths
for VETH in $(ip -o link show | grep -o v${CONTAINER_IFNAME}[^:@]*) ; do
ip link del $VETH >/dev/null 2>&1 || true
done
if [ "$DOCKER_BRIDGE" != "$BRIDGE" ] ; then
run_iptables -t filter -D FORWARD -i $DOCKER_BRIDGE -o $BRIDGE -j DROP 2>/dev/null || true
fi
[ -n "$DOCKER_BRIDGE_IP" ] || DOCKER_BRIDGE_IP=$(util_op bridge-ip $DOCKER_BRIDGE)
run_iptables -t filter -D INPUT -i $DOCKER_BRIDGE -p udp --dport 53 -j ACCEPT >/dev/null 2>&1 || true
run_iptables -t filter -D INPUT -i $DOCKER_BRIDGE -p tcp --dport 53 -j ACCEPT >/dev/null 2>&1 || true
run_iptables -t filter -D INPUT -i $DOCKER_BRIDGE -p tcp --dst $DOCKER_BRIDGE_IP --dport $PORT -j DROP >/dev/null 2>&1 || true
run_iptables -t filter -D INPUT -i $DOCKER_BRIDGE -p udp --dst $DOCKER_BRIDGE_IP --dport $PORT -j DROP >/dev/null 2>&1 || true
run_iptables -t filter -D INPUT -i $DOCKER_BRIDGE -p udp --dst $DOCKER_BRIDGE_IP --dport $(($PORT + 1)) -j DROP >/dev/null 2>&1 || true
run_iptables -t filter -D FORWARD -i $BRIDGE ! -o $BRIDGE -j ACCEPT 2>/dev/null || true
run_iptables -t filter -D FORWARD -o $BRIDGE -m conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT 2>/dev/null || true
run_iptables -t filter -D FORWARD -i $BRIDGE -o $BRIDGE -j ACCEPT 2>/dev/null || true
run_iptables -F WEAVE-NPC >/dev/null 2>&1 || true
run_iptables -t filter -D FORWARD -o $BRIDGE -j WEAVE-NPC 2>/dev/null || true
run_iptables -t filter -D FORWARD -o $BRIDGE -m state --state NEW -j NFLOG --nflog-group 86 2>/dev/null || true
run_iptables -t filter -D FORWARD -o $BRIDGE -j DROP 2>/dev/null || true
run_iptables -X WEAVE-NPC >/dev/null 2>&1 || true
run_iptables -t nat -F WEAVE >/dev/null 2>&1 || true
run_iptables -t nat -D POSTROUTING -j WEAVE >/dev/null 2>&1 || true
run_iptables -t nat -D POSTROUTING -o $BRIDGE -j ACCEPT >/dev/null 2>&1 || true
run_iptables -t nat -X WEAVE >/dev/null 2>&1 || true
}
add_iface_fastdp() {
util_op add-datapath-interface $DATAPATH $1
}
add_iface_bridge() {
ip link set $1 master $BRIDGE
}
add_iface_bridged_fastdp() {
add_iface_bridge "$@"
}
attach_bridge() {
bridge="$1"
LOCAL_IFNAME=v${CONTAINER_IFNAME}bl$bridge
GUEST_IFNAME=v${CONTAINER_IFNAME}bg$bridge
create_veth $LOCAL_IFNAME $GUEST_IFNAME configure_veth_attached_bridge
}
configure_veth_attached_bridge() {
add_iface_$BRIDGE_TYPE $LOCAL_IFNAME || return 1
ip link set $GUEST_IFNAME master $bridge
}
router_bridge_opts() {
echo --docker-bridge "$DOCKER_BRIDGE" --weave-bridge "$BRIDGE" --datapath "$DATAPATH"
[ -z "$WEAVE_MTU" ] || echo --mtu "$WEAVE_MTU"
[ -z $WEAVE_NO_FASTDP ] || echo --no-fastdp
}
ask_version() {
if check_running $1 2>/dev/null ; then
DOCKERIMAGE=$(docker inspect --format='{{.Image}}' $1 )
elif ! DOCKERIMAGE=$(docker inspect --format='{{.Id}}' $2 2>/dev/null) ; then
echo "Unable to find $2 image." >&2
fi
[ -n "$DOCKERIMAGE" ] && docker run --rm --net=none -e WEAVE_CIDR=none $3 $DOCKERIMAGE $COVERAGE_ARGS --version
}
attach() {
ATTACH_ARGS=""
[ -n "$NO_MULTICAST_ROUTE" ] && ATTACH_ARGS="--no-multicast-route"
# Relying on AWSVPC being set in 'ipam_cidrs allocate'
[ -n "$AWSVPC" ] && ATTACH_ARGS="--no-multicast-route --keep-tx-on"
util_op attach-container $ATTACH_ARGS $CONTAINER $BRIDGE $MTU "$@"
}
######################################################################
# functions for interacting with containers
######################################################################
# Check that a container for component $1 named $2 with image $3 is not running
check_not_running() {
RUN_STATUS=$(docker inspect --format='{{.State.Running}} {{.State.Status}} {{.Config.Image}}' $2 2>/dev/null) || true
case ${RUN_STATUS%:*} in
"true restarting $3")
echo "$2 is restarting; you can stop it with 'weave stop'." >&2
return 3
;;
"true "*" $3")
echo "$2 is already running; you can stop it with 'weave stop'." >&2
return 1
;;
"false "*" $3")
docker rm $2 >/dev/null
;;
true*)
echo "Found another running container named '$2'. Aborting." >&2
return 2
;;
false*)
echo "Found another container named '$2'. Aborting." >&2
return 2
;;
esac
}
# Given a container name or short ID in $1, ensure the specified
# container exists and then print its full ID to stdout. If
# it doesn't exist, print an error to stderr and
# return with an indicative non-zero exit code.
container_id() {
if ! docker inspect --format='{{.Id}}' $1 2>/dev/null ; then
echo "Error: No such container: $1" >&2
return 1
fi
}
http_call() {
addr="$1"
http_verb="$2"
url="$3"
shift 3
CURL_TMPOUT=/tmp/weave_curl_out_$$
HTTP_CODE=$(curl -o $CURL_TMPOUT -w '%{http_code}' --connect-timeout 3 -s -S -X $http_verb "$@" http://$addr$url) || return $?
case "$HTTP_CODE" in
2??) # 2xx -> not an error; output response on stdout
[ -f $CURL_TMPOUT ] && cat $CURL_TMPOUT
retval=0
;;
404) # treat as error but swallow response
retval=4
;;
*) # anything else is an error; output response on stderr
[ -f $CURL_TMPOUT ] && cat $CURL_TMPOUT >&2
retval=1
esac
rm -f $CURL_TMPOUT
return $retval
}
call_weave() {
TMPERR=/tmp/call_weave_err_$$
retval=0
http_call $HTTP_ADDR "$@" 2>$TMPERR || retval=$?
if [ $retval -ne 0 ] ; then
check_running $CONTAINER_NAME && cat $TMPERR >&2
fi
rm -f $TMPERR
return $retval
}
death_msg() {
echo "The $1 container has died. Consult the container logs for further details."
}
# Wait until container $1 is alive enough to respond to "GET /status"
# http request
wait_for_status() {
container="$1"
shift
while true ; do
"$@" GET /status >/dev/null 2>&1 && return 0
if ! check_running $container >/dev/null 2>&1 ; then
kill_container $container # stop it restarting
echo $(death_msg $container) >&2
return 1
fi
fractional_sleep 0.1
done
}
# Call $1 for all containers, passing container ID, all MACs and all IPs
with_container_addresses() {
COMMAND_WCA=$1
shift 1
CONTAINER_ADDRS=$(util_op container-addrs $BRIDGE "$@") || return 1
echo "$CONTAINER_ADDRS" | while read CONTAINER_ID CONTAINER_IFACE CONTAINER_MAC CONTAINER_IPS; do
$COMMAND_WCA "$CONTAINER_ID" "$CONTAINER_IFACE" "$CONTAINER_MAC" "$CONTAINER_IPS"
done
}
echo_addresses() {
echo $(printf "%.12s" $1) $3 $4
}
echo_ips() {
for CIDR in $4; do
echo ${CIDR%/*}
done
}
echo_cidrs() {
echo $4
}
peer_args() {
res=''
sep=''
for p in "$@" ; do
res="$res${sep}peer=$p"
sep="&"
done
echo "$res"
}
######################################################################
# CNI helpers
######################################################################
install_cni_plugin() {
mkdir -p $1 || return 1
if [ ! -f "$1/$CNI_PLUGIN_NAME" ]; then
cp /usr/bin/weaveutil "$1/$CNI_PLUGIN_NAME"
fi
}
upgrade_cni_plugin_symlink() {
# Remove potential temporary symlink from previous failed upgrade:
rm -f $1/$2.tmp
# Atomically create a symlink to the plugin:
ln -s "$CNI_PLUGIN_NAME" $1/$2.tmp && mv -f $1/$2.tmp $1/$2
}
upgrade_cni_plugin() {
# Check if weave-net and weave-ipam are (legacy) copies of the plugin, and
# if so remove these so symlinks can be used instead from now onwards.
if [ -f $1/weave-net -a ! -L $1/weave-net ]; then rm $1/weave-net; fi
if [ -f $1/weave-ipam -a ! -L $1/weave-ipam ]; then rm $1/weave-ipam; fi
# Create two symlinks to the plugin, as it has different
# behaviour depending on its name:
if [ "$(readlink -f $1/weave-net)" != "$CNI_PLUGIN_NAME" ]; then
upgrade_cni_plugin_symlink $1 weave-net
fi
if [ "$(readlink -f $1/weave-ipam)" != "$CNI_PLUGIN_NAME" ]; then
upgrade_cni_plugin_symlink $1 weave-ipam
fi
}
create_cni_config() {
cat >"$1" <<EOF
{
"name": "weave",
"type": "weave-net",
"hairpinMode": $2
}
EOF
}
setup_cni() {
# if env var HAIRPIN_MODE is not set, default it to true
HAIRPIN_MODE=${HAIRPIN_MODE:-true}
if install_cni_plugin $CNI_PLUGIN_DIR ; then
upgrade_cni_plugin $CNI_PLUGIN_DIR
fi
if [ -d $HOST_ROOT/etc/cni/net.d -a ! -f $HOST_ROOT/etc/cni/net.d/10-weave.conf ] ; then
create_cni_config $HOST_ROOT/etc/cni/net.d/10-weave.conf $HAIRPIN_MODE
fi
}
######################################################################
# weaveDNS helpers
######################################################################
dns_args() {
retval=0
# NB: this is memoized
DNS_DOMAIN=${DNS_DOMAIN:-$(call_weave GET /domain 2>/dev/null)} || retval=$?
[ "$retval" -eq 4 ] && return 0
DNS_DOMAIN=${DNS_DOMAIN:-weave.local.}
NAME_ARG=""
HOSTNAME_SPECIFIED=
DNS_SEARCH_SPECIFIED=
WITHOUT_DNS=
while [ $# -gt 0 ] ; do
case "$1" in
--without-dns)
WITHOUT_DNS=1
;;
--name)
NAME_ARG="$2"
shift
;;
--name=*)
NAME_ARG="${1#*=}"
;;
-h|--hostname|--hostname=*)
HOSTNAME_SPECIFIED=1
;;
--dns-search|--dns-search=*)
DNS_SEARCH_SPECIFIED=1
;;
esac
shift
done
[ -n "$WITHOUT_DNS" ] && return 0
[ -n "$DOCKER_BRIDGE_IP" ] || DOCKER_BRIDGE_IP=$(util_op bridge-ip $DOCKER_BRIDGE)
DNS_ARGS="--dns=$DOCKER_BRIDGE_IP"
if [ -n "$NAME_ARG" -a -z "$HOSTNAME_SPECIFIED" ] ; then
HOSTNAME="$NAME_ARG.${DNS_DOMAIN%.}"
if [ ${#HOSTNAME} -gt 64 ] ; then
echo "Container name too long to be used as hostname" >&2
else
DNS_ARGS="$DNS_ARGS --hostname=$HOSTNAME"
HOSTNAME_SPECIFIED=1
fi
fi
if [ -z "$DNS_SEARCH_SPECIFIED" ] ; then
if [ -z "$HOSTNAME_SPECIFIED" ] ; then
DNS_ARGS="$DNS_ARGS --dns-search=$DNS_DOMAIN"
else
DNS_ARGS="$DNS_ARGS --dns-search=."
fi
fi
}
rewrite_etc_hosts() {
HOSTS_PATH_AND_FQDN=$(docker inspect -f '{{.HostsPath}} {{.Config.Hostname}}.{{.Config.Domainname}}' $CONTAINER) || return 1
HOSTS=${HOSTS_PATH_AND_FQDN% *}
FQDN=${HOSTS_PATH_AND_FQDN#* }
# rewrite /etc/hosts, unlinking the file (so Docker does not modify it again) but
# leaving it with valid contents...
util_op rewrite-etc-hosts "$HOSTS" "$FQDN" "$EXEC_IMAGE" "$ALL_CIDRS" "$@"
}
# Print an error to stderr and return with an indicative exit status
# if the container $1 does not exist or isn't running.
check_running() {
if ! STATUS=$(docker inspect --format='{{.State.Running}} {{.State.Restarting}}' $1 2>/dev/null) ; then
echo "$1 container is not present. Have you launched it?" >&2
return 1
elif [ "$STATUS" = "true true" ] ; then
echo "$1 container is restarting." >&2
return 2
elif [ "$STATUS" != "true false" ] ; then
echo "$1 container is not running." >&2
return 2
fi
}
# Execute $@ only if the weave container is running
when_weave_running() {
! check_running $CONTAINER_NAME 2>/dev/null || "$@"
}
# Iff the container in $1 has an FQDN, invoke $2 as a command passing
# the container as the first argument, the FQDN as the second argument
# and $3.. as additional arguments
with_container_fqdn() {
CONT="$1"
COMMAND_WCF="$2"
shift 2
CONT_FQDN=$(docker inspect --format='{{.Config.Hostname}}.{{.Config.Domainname}}' $CONT 2>/dev/null) || return 0
CONT_NAME=${CONT_FQDN%%.*}
[ "$CONT_NAME" = "$CONT_FQDN" -o "$CONT_NAME." = "$CONT_FQDN" ] || $COMMAND_WCF "$CONT" "$CONT_FQDN" "$@"
}
# Register FQDN in $2 as names for addresses $3.. under full container ID $1
put_dns_fqdn() {
CHECK_ALIVE="-d check-alive=true"
put_dns_fqdn_helper "$@"
}
put_dns_fqdn_no_check_alive() {
CHECK_ALIVE=
put_dns_fqdn_helper "$@"
}
put_dns_fqdn_helper() {
CONTAINER_ID="$1"
FQDN="$2"
shift 2
for ADDR in "$@" ; do
call_weave PUT /name/$CONTAINER_ID/${ADDR%/*} --data-urlencode fqdn=$FQDN $CHECK_ALIVE || true
done
}
# Delete all names for addresses $3.. under full container ID $1
delete_dns() {
CONTAINER_ID="$1"
shift 1
for ADDR in "$@" ; do
call_weave DELETE /name/$CONTAINER_ID/${ADDR%/*} || true
done
}
# Delete any FQDNs $2 from addresses $3.. under full container ID $1
delete_dns_fqdn() {
CONTAINER_ID="$1"
FQDN="$2"
shift 2
for ADDR in "$@" ; do
call_weave DELETE /name/$CONTAINER_ID/${ADDR%/*}?fqdn=$FQDN || true
done
}
is_ip() {
echo "$1" | grep -E "^$IP_REGEXP$" >/dev/null
}
collect_ip_args() {
IP_ARGS=""
IP_COUNT=0
while is_ip "$1" ; do
IP_ARGS="$IP_ARGS $1"
IP_COUNT=$((IP_COUNT + 1))
shift 1
done
}
collect_dns_add_remove_args() {
collect_ip_args "$@"
shift $IP_COUNT
[ $# -gt 0 -a "$1" != "-h" ] && C="$1" && shift 1
[ $# -eq 2 -a "$1" = "-h" ] && FQDN="$2" && shift 2
[ $# -eq 0 -a \( -n "$C" -o \( $IP_COUNT -gt 0 -a -n "$FQDN" \) \) ] || usage
check_running $CONTAINER_NAME
if [ -n "$C" ] ; then
check_running $C
CONTAINER=$(container_id $C)
[ $IP_COUNT -gt 0 ] || IP_ARGS=$(with_container_addresses echo_ips $CONTAINER)
fi
}
######################################################################
# IP Allocation Management helpers
######################################################################
check_overlap() {
util_op netcheck $1 $BRIDGE
}
detect_awsvpc() {
# Ignoring errors here: if we cannot detect AWSVPC we will skip the relevant
# steps, because "attach" should work without the weave router running.
[ "$(call_weave GET /ipinfo/tracker)" != "awsvpc" ] || AWSVPC=1
}
# Call IPAM as necessary to lookup or allocate addresses
#
# $1 is one of 'lookup', 'allocate' or 'allocate_no_check_alive', $2
# is the full container id. The remaining args are previously parsed
# CIDR_ARGS.
#
# Populates ALL_CIDRS and IPAM_CIDRS
ipam_cidrs() {
case $1 in
lookup)
METHOD=GET
CHECK_ALIVE=
;;
allocate)
METHOD=POST
CHECK_ALIVE="?check-alive=true"
detect_awsvpc
if [ -n "$AWSVPC" -a $# -gt 2 ] ; then
echo "Error: no IP addresses or subnets may be specified in AWSVPC mode" >&2
return 1
fi
;;
allocate_no_check_alive)
METHOD=POST
CHECK_ALIVE=
;;
esac
CONTAINER_ID="$2"
shift 2
ALL_CIDRS=""
IPAM_CIDRS=""
# If no addresses passed in, select the default subnet
[ $# -gt 0 ] || set -- net:default
for arg in "$@" ; do
if [ "${arg%:*}" = "net" ] ; then
if [ "$arg" = "net:default" ] ; then
IPAM_URL=/ip/$CONTAINER_ID
else
IPAM_URL=/ip/$CONTAINER_ID/"${arg#net:}"
fi
retval=0
CIDR=$(call_weave $METHOD $IPAM_URL$CHECK_ALIVE) || retval=$?
if [ $retval -eq 4 -a "$METHOD" = "POST" ] ; then
echo "IP address allocation must be enabled to use 'net:'" >&2
return 1
fi
[ $retval -gt 0 ] && return $retval
IPAM_CIDRS="$IPAM_CIDRS $CIDR"
ALL_CIDRS="$ALL_CIDRS $CIDR"
else