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