b88f173c43
This takes some of the machinery from CNI and from the rkt networking code, and turns it into a library that can be linked into go apps. Included is an example command-line application that uses the library, called `cnitool`. Other headline changes: * Plugin exec'ing is factored out The motivation here is to factor out the protocol for invoking plugins. To that end, a generalisation of the code from api.go and pkg/plugin/ipam.go goes into pkg/invoke/exec.go. * Move argument-handling and conf-loading into public API The fact that the arguments get turned into an environment for the plugin is incidental to the API; so, provide a way of supplying them as a struct or saying "just use the same arguments as I got" (the latter is for IPAM plugins).
76 lines
2.1 KiB
Go
76 lines
2.1 KiB
Go
// Copyright 2015 CoreOS, Inc.
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//
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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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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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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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package ipam
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import (
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"fmt"
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"os"
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"github.com/appc/cni/pkg/invoke"
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"github.com/appc/cni/pkg/ip"
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"github.com/appc/cni/pkg/types"
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"github.com/vishvananda/netlink"
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)
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func ExecAdd(plugin string, netconf []byte) (*types.Result, error) {
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if os.Getenv("CNI_COMMAND") != "ADD" {
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return nil, fmt.Errorf("CNI_COMMAND is not ADD")
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}
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return invoke.ExecPlugin(invoke.Find(plugin), netconf, invoke.ArgsFromEnv())
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}
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func ExecDel(plugin string, netconf []byte) error {
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if os.Getenv("CNI_COMMAND") != "DEL" {
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return fmt.Errorf("CNI_COMMAND is not DEL")
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}
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_, err := invoke.ExecPlugin(invoke.Find(plugin), netconf, invoke.ArgsFromEnv())
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return err
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}
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// ConfigureIface takes the result of IPAM plugin and
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// applies to the ifName interface
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func ConfigureIface(ifName string, res *types.Result) error {
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link, err := netlink.LinkByName(ifName)
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if err != nil {
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return fmt.Errorf("failed to lookup %q: %v", ifName, err)
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}
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if err := netlink.LinkSetUp(link); err != nil {
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return fmt.Errorf("failed to set %q UP: %v", ifName, err)
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}
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// TODO(eyakubovich): IPv6
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addr := &netlink.Addr{IPNet: &res.IP4.IP, Label: ""}
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if err = netlink.AddrAdd(link, addr); err != nil {
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return fmt.Errorf("failed to add IP addr to %q: %v", ifName, err)
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}
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for _, r := range res.IP4.Routes {
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gw := r.GW
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if gw == nil {
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gw = res.IP4.Gateway
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}
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if err = ip.AddRoute(&r.Dst, gw, link); err != nil {
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// we skip over duplicate routes as we assume the first one wins
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if !os.IsExist(err) {
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return fmt.Errorf("failed to add route '%v via %v dev %v': %v", r.Dst, gw, ifName, err)
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}
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}
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}
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return nil
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}
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