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#!/bin/bash
# Copyright The containerd Authors.
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
# http://www.apache.org/licenses/LICENSE-2.0
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
set -eu -o pipefail
DESTDIR="${DESTDIR:-"C:\\Program Files\\containerd"}"
WINCNI_BIN_DIR="${DESTDIR}/cni/bin"
WINCNI_PKG=github.com/Microsoft/windows-container-networking
WINCNI_VERSION=aa10a0b31e9f72937063436454def1760b858ee2
git clone "https://${WINCNI_PKG}.git" "${GOPATH}/src/${WINCNI_PKG}"
cd "${GOPATH}/src/${WINCNI_PKG}"
git checkout "${WINCNI_VERSION}"
make all
install -D -m 755 "out/nat.exe" "${WINCNI_BIN_DIR}/nat.exe"
install -D -m 755 "out/sdnbridge.exe" "${WINCNI_BIN_DIR}/sdnbridge.exe"
install -D -m 755 "out/sdnoverlay.exe" "${WINCNI_BIN_DIR}/sdnoverlay.exe"
CNI_CONFIG_DIR="${DESTDIR}/cni/conf"
mkdir -p "${CNI_CONFIG_DIR}"
# split_ip splits ip into a 4-element array.
split_ip() {
local -r varname="$1"
local -r ip="$2"
for i in {0..3}; do
eval "$varname"[$i]="$( echo "$ip" | cut -d '.' -f $((i + 1)) )"
done
}
# subnet gets subnet for a gateway, e.g. 192.168.100.0/24.
calculate_subnet() {
local -r gateway="$1"
local -r prefix_len="$2"
split_ip gateway_array "$gateway"
local len=$prefix_len
for i in {0..3}; do
if (( len >= 8 )); then
mask=255
elif (( len > 0 )); then
mask=$(( 256 - 2 ** ( 8 - len ) ))
else
mask=0
fi
(( len -= 8 ))
result_array[i]=$(( gateway_array[i] & mask ))
done
result="$(printf ".%s" "${result_array[@]}")"
result="${result:1}"
echo "$result/$((32 - prefix_len))"
}
# nat already exists on the Windows VM, the subnet and gateway
# we specify should match that.
: ${GATEWAY:="$(powershell -c "(Get-NetIPAddress -InterfaceAlias 'vEthernet (nat)' -AddressFamily IPv4).IPAddress")"}
: ${PREFIX_LEN:="$(powershell -c "(Get-NetIPAddress -InterfaceAlias 'vEthernet (nat)' -AddressFamily IPv4).PrefixLength")"}
subnet="$(calculate_subnet "$GATEWAY" "$PREFIX_LEN")"
# The "name" field in the config is used as the underlying
# network type right now (see
# https://github.com/microsoft/windows-container-networking/pull/45),
# so it must match a network type in:
# https://docs.microsoft.com/en-us/windows-server/networking/technologies/hcn/hcn-json-document-schemas
bash -c 'cat >"'"${CNI_CONFIG_DIR}"'"/0-containerd-nat.conf <<EOF
{
"cniVersion": "0.2.0",
"name": "nat",
"type": "nat",
"master": "Ethernet",
"ipam": {
"subnet": "'$subnet'",
"routes": [
{
"GW": "'$GATEWAY'"
}
]
},
"capabilities": {
"portMappings": true,
"dns": true
}
}
EOF'
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