74 lines
1.8 KiB
Go
74 lines
1.8 KiB
Go
// Copyright 2018-present the CoreDHCP Authors. All rights reserved
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// This source code is licensed under the MIT license found in the
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// LICENSE file in the root directory of this source tree.
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package staticroute
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import (
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"errors"
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"net"
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"strings"
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"github.com/coredhcp/coredhcp/handler"
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"github.com/coredhcp/coredhcp/logger"
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"github.com/coredhcp/coredhcp/plugins"
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"github.com/insomniacslk/dhcp/dhcpv4"
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)
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var log = logger.GetLogger("plugins/staticroute")
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// Plugin wraps the information necessary to register a plugin.
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var Plugin = plugins.Plugin{
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Name: "staticroute",
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Setup4: setup4,
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}
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var routes dhcpv4.Routes
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func setup4(args ...string) (handler.Handler4, error) {
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log.Printf("loaded plugin for DHCPv4.")
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routes = make(dhcpv4.Routes, 0)
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if len(args) < 1 {
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return nil, errors.New("need at least one static route")
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}
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var err error
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for _, arg := range args {
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fields := strings.Split(arg, ",")
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if len(fields) != 2 {
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return Handler4, errors.New("expected a destination/gateway pair, got: " + arg)
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}
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route := &dhcpv4.Route{}
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_, route.Dest, err = net.ParseCIDR(fields[0])
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if err != nil {
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return Handler4, errors.New("expected a destination subnet, got: " + fields[0])
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}
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route.Router = net.ParseIP(fields[1])
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if route.Router == nil {
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return Handler4, errors.New("expected a gateway address, got: " + fields[1])
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}
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routes = append(routes, route)
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log.Debugf("adding static route %s", route)
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}
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log.Printf("loaded %d static routes.", len(routes))
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return Handler4, nil
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}
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// Handler4 handles DHCPv4 packets for the static routes plugin
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func Handler4(req, resp *dhcpv4.DHCPv4) (*dhcpv4.DHCPv4, bool) {
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if len(routes) > 0 {
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resp.Options.Update(dhcpv4.Option{
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Code: dhcpv4.OptionCode(dhcpv4.OptionClasslessStaticRoute),
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Value: routes,
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})
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}
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return resp, false
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}
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