72f2a1ffd4
Now that libcni has the ability to print a version message, plumb it through correctly. While we're at it, - fix import paths - run gofmt - add some more comments to sample - add container runtime swappability for release
98 lines
2.3 KiB
Go
98 lines
2.3 KiB
Go
// Copyright 2017 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 allocator
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import (
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"fmt"
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"net"
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"strings"
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)
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// Contains returns true if any range in this set contains an IP
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func (s *RangeSet) Contains(addr net.IP) bool {
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r, _ := s.RangeFor(addr)
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return r != nil
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}
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// RangeFor finds the range that contains an IP, or nil if not found
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func (s *RangeSet) RangeFor(addr net.IP) (*Range, error) {
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if err := canonicalizeIP(&addr); err != nil {
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return nil, err
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}
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for _, r := range *s {
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if r.Contains(addr) {
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return &r, nil
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}
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}
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return nil, fmt.Errorf("%s not in range set %s", addr.String(), s.String())
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}
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// Overlaps returns true if any ranges in any set overlap with this one
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func (s *RangeSet) Overlaps(p1 *RangeSet) bool {
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for _, r := range *s {
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for _, r1 := range *p1 {
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if r.Overlaps(&r1) {
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return true
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}
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}
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}
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return false
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}
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// Canonicalize ensures the RangeSet is in a standard form, and detects any
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// invalid input. Call Range.Canonicalize() on every Range in the set
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func (s *RangeSet) Canonicalize() error {
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if len(*s) == 0 {
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return fmt.Errorf("empty range set")
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}
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fam := 0
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for i := range *s {
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if err := (*s)[i].Canonicalize(); err != nil {
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return err
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}
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if i == 0 {
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fam = len((*s)[i].RangeStart)
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} else {
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if fam != len((*s)[i].RangeStart) {
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return fmt.Errorf("mixed address families")
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}
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}
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}
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// Make sure none of the ranges in the set overlap
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l := len(*s)
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for i, r1 := range (*s)[:l-1] {
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for _, r2 := range (*s)[i+1:] {
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if r1.Overlaps(&r2) {
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return fmt.Errorf("subnets %s and %s overlap", r1.String(), r2.String())
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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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func (s *RangeSet) String() string {
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out := []string{}
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for _, r := range *s {
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out = append(out, r.String())
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}
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return strings.Join(out, ",")
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}
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