ed5f8dfeb2
The project has been moved so internally we simply rename everything. Consumers are recommended to update their vendored version of cni.
140 lines
3.2 KiB
Go
140 lines
3.2 KiB
Go
// Copyright 2015 CNI authors
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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 main
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import (
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"encoding/binary"
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"fmt"
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"net"
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"time"
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"github.com/containernetworking/cni/pkg/types"
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"github.com/d2g/dhcp4"
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)
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func parseRouter(opts dhcp4.Options) net.IP {
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if opts, ok := opts[dhcp4.OptionRouter]; ok {
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if len(opts) == 4 {
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return net.IP(opts)
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}
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}
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return nil
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}
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func classfulSubnet(sn net.IP) net.IPNet {
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return net.IPNet{
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IP: sn,
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Mask: sn.DefaultMask(),
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}
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}
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func parseRoutes(opts dhcp4.Options) []types.Route {
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// StaticRoutes format: pairs of:
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// Dest = 4 bytes; Classful IP subnet
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// Router = 4 bytes; IP address of router
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routes := []types.Route{}
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if opt, ok := opts[dhcp4.OptionStaticRoute]; ok {
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for len(opt) >= 8 {
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sn := opt[0:4]
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r := opt[4:8]
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rt := types.Route{
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Dst: classfulSubnet(sn),
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GW: r,
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}
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routes = append(routes, rt)
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opt = opt[8:]
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}
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}
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return routes
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}
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func parseCIDRRoutes(opts dhcp4.Options) []types.Route {
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// See RFC4332 for format (http://tools.ietf.org/html/rfc3442)
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routes := []types.Route{}
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if opt, ok := opts[dhcp4.OptionClasslessRouteFormat]; ok {
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for len(opt) >= 5 {
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width := int(opt[0])
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if width > 32 {
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// error: can't have more than /32
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return nil
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}
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// network bits are compacted to avoid zeros
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octets := 0
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if width > 0 {
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octets = (width-1)/8 + 1
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}
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if len(opt) < 1+octets+4 {
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// error: too short
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return nil
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}
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sn := make([]byte, 4)
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copy(sn, opt[1:octets+1])
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gw := net.IP(opt[octets+1 : octets+5])
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rt := types.Route{
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Dst: net.IPNet{
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IP: net.IP(sn),
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Mask: net.CIDRMask(width, 32),
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},
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GW: gw,
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}
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routes = append(routes, rt)
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opt = opt[octets+5 : len(opt)]
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}
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}
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return routes
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}
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func parseSubnetMask(opts dhcp4.Options) net.IPMask {
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mask, ok := opts[dhcp4.OptionSubnetMask]
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if !ok {
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return nil
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}
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return net.IPMask(mask)
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}
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func parseDuration(opts dhcp4.Options, code dhcp4.OptionCode, optName string) (time.Duration, error) {
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val, ok := opts[code]
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if !ok {
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return 0, fmt.Errorf("option %v not found", optName)
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}
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if len(val) != 4 {
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return 0, fmt.Errorf("option %v is not 4 bytes", optName)
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}
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secs := binary.BigEndian.Uint32(val)
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return time.Duration(secs) * time.Second, nil
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}
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func parseLeaseTime(opts dhcp4.Options) (time.Duration, error) {
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return parseDuration(opts, dhcp4.OptionIPAddressLeaseTime, "LeaseTime")
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}
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func parseRenewalTime(opts dhcp4.Options) (time.Duration, error) {
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return parseDuration(opts, dhcp4.OptionRenewalTimeValue, "RenewalTime")
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}
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func parseRebindingTime(opts dhcp4.Options) (time.Duration, error) {
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return parseDuration(opts, dhcp4.OptionRebindingTimeValue, "RebindingTime")
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}
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