CNI on Windows

Install-CNIPlugin.ps1

# 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.

$DESTDIR = "$env:ProgramFiles\containerd"
$WINCNI_BIN_DIR = "$DESTDIR\cni\bin"

# releases: https://github.com/containernetworking/plugins/releases

$Version = "1.2.0"
# currently, only one architecture (amd64) is officially supported
$Uri = "https://github.com/containernetworking/plugins/releases/download/v$Version/cni-plugins-windows-amd64-v$Version.tgz"

# download the binaries
New-Item -Type Directory $WINCNI_BIN_DIR -Force
Invoke-WebRequest -Uri $Uri -OutFile cni-plugins-windows-amd64-v$Version.tgz
tar xvf .\cni-plugins-windows-amd64-v1.2.0.tgz -C $WINCNI_BIN_DIR

$CNI_CONFIG_DIR = "$DESTDIR\cni\conf"
New-Item -Type Directory $WINCNI_BIN_DIR

# TODO, split_ip and calculate_subnet
# ref: https://github.com/containerd/containerd/blob/main/script/setup/install-cni-windows
# hardcoding for now
$subnet = 24

# InterfaceAlias may differ
$GATEWAY = (Get-NetIPAddress -InterfaceAlias 'Ethernet' -AddressFamily IPv4).IPAddress
$PREFIX_LEN = (Get-NetIPAddress -InterfaceAlias 'Ethernet' -AddressFamily IPv4).PrefixLength

echo @"
{
  "cniVersion": "1.0.0",
  "name": "containerd-net",
  "plugins": [
    {
      "type": "bridge",
      "bridge": "cni0",
      "isGateway": true,
      "ipMasq": true,
      "promiscMode": true,
      "ipam": {
        "type": "host-local",
        "ranges": [
          [{
            "subnet": "$GATEWAY/$subnet"
          }]
        ],
        "routes": [
          { "dst": "0.0.0.0/0" },
          { "dst": "::/0" }
        ]
      }
    },
    {
      "type": "portmap",
      "capabilities": {"portMappings": true}
    }
  ]
}
"@ | Write-Output | Out-File "$CNI_CONFIG_DIR\0-containerd.conf" -Encoding "utf8"