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example_test.go
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// Copyright 2015 Mikio Hara. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE.
package ipaddr_test
import (
"fmt"
"log"
"net"
"github.com/mikioh/ipaddr"
)
func ExampleCursor_traversal() {
c, err := ipaddr.Parse("2001:db8::/126,192.0.2.128/30,198.51.100.0/29")
if err != nil {
log.Fatal(err)
}
fmt.Println(c.Pos(), c.First(), c.Last(), c.List())
for pos := c.Next(); pos != nil; pos = c.Next() {
fmt.Println(pos)
}
fmt.Println(c.Pos(), c.First(), c.Last(), c.List())
for pos := c.Prev(); pos != nil; pos = c.Prev() {
fmt.Println(pos)
}
fmt.Println(c.Pos(), c.First(), c.Last(), c.List())
// Output:
// &{192.0.2.128 192.0.2.128/30} &{192.0.2.128 192.0.2.128/30} &{2001:db8::3 2001:db8::/126} [192.0.2.128/30 198.51.100.0/29 2001:db8::/126]
// &{192.0.2.129 192.0.2.128/30}
// &{192.0.2.130 192.0.2.128/30}
// &{192.0.2.131 192.0.2.128/30}
// &{198.51.100.0 198.51.100.0/29}
// &{198.51.100.1 198.51.100.0/29}
// &{198.51.100.2 198.51.100.0/29}
// &{198.51.100.3 198.51.100.0/29}
// &{198.51.100.4 198.51.100.0/29}
// &{198.51.100.5 198.51.100.0/29}
// &{198.51.100.6 198.51.100.0/29}
// &{198.51.100.7 198.51.100.0/29}
// &{2001:db8:: 2001:db8::/126}
// &{2001:db8::1 2001:db8::/126}
// &{2001:db8::2 2001:db8::/126}
// &{2001:db8::3 2001:db8::/126}
// &{2001:db8::3 2001:db8::/126} &{192.0.2.128 192.0.2.128/30} &{2001:db8::3 2001:db8::/126} [192.0.2.128/30 198.51.100.0/29 2001:db8::/126]
// &{2001:db8::2 2001:db8::/126}
// &{2001:db8::1 2001:db8::/126}
// &{2001:db8:: 2001:db8::/126}
// &{198.51.100.7 198.51.100.0/29}
// &{198.51.100.6 198.51.100.0/29}
// &{198.51.100.5 198.51.100.0/29}
// &{198.51.100.4 198.51.100.0/29}
// &{198.51.100.3 198.51.100.0/29}
// &{198.51.100.2 198.51.100.0/29}
// &{198.51.100.1 198.51.100.0/29}
// &{198.51.100.0 198.51.100.0/29}
// &{192.0.2.131 192.0.2.128/30}
// &{192.0.2.130 192.0.2.128/30}
// &{192.0.2.129 192.0.2.128/30}
// &{192.0.2.128 192.0.2.128/30}
// &{192.0.2.128 192.0.2.128/30} &{192.0.2.128 192.0.2.128/30} &{2001:db8::3 2001:db8::/126} [192.0.2.128/30 198.51.100.0/29 2001:db8::/126]
}
func ExamplePrefix_subnettingAndSupernetting() {
_, n, err := net.ParseCIDR("203.0.113.0/24")
if err != nil {
log.Fatal(err)
}
p := ipaddr.NewPrefix(n)
fmt.Println(p.IP, p.Last(), p.Len(), p.Mask, p.Hostmask())
fmt.Println()
ps := p.Subnets(3)
for _, p := range ps {
fmt.Println(p)
}
fmt.Println()
fmt.Println(ipaddr.Supernet(ps))
fmt.Println(ipaddr.Supernet(ps[1:7]))
fmt.Println(ipaddr.Supernet(ps[:4]))
fmt.Println(ipaddr.Supernet(ps[4:8]))
// Output:
// 203.0.113.0 203.0.113.255 24 ffffff00 000000ff
//
// 203.0.113.0/27
// 203.0.113.32/27
// 203.0.113.64/27
// 203.0.113.96/27
// 203.0.113.128/27
// 203.0.113.160/27
// 203.0.113.192/27
// 203.0.113.224/27
//
// 203.0.113.0/24
// 203.0.113.0/24
// 203.0.113.0/25
// 203.0.113.128/25
}
func ExamplePrefix_subnettingAndAggregation() {
_, n, err := net.ParseCIDR("192.0.2.0/24")
if err != nil {
log.Fatal(err)
}
p := ipaddr.NewPrefix(n)
fmt.Println(p.IP, p.Last(), p.Len(), p.Mask, p.Hostmask())
fmt.Println()
ps := p.Subnets(3)
for _, p := range ps {
fmt.Println(p)
}
fmt.Println()
fmt.Println(ipaddr.Aggregate(ps))
fmt.Println(ipaddr.Aggregate(ps[1:7]))
fmt.Println(ipaddr.Aggregate(ps[:4]))
fmt.Println(ipaddr.Aggregate(ps[4:8]))
// Output:
// 192.0.2.0 192.0.2.255 24 ffffff00 000000ff
//
// 192.0.2.0/27
// 192.0.2.32/27
// 192.0.2.64/27
// 192.0.2.96/27
// 192.0.2.128/27
// 192.0.2.160/27
// 192.0.2.192/27
// 192.0.2.224/27
//
// [192.0.2.0/24]
// [192.0.2.32/27 192.0.2.64/26 192.0.2.128/26 192.0.2.192/27]
// [192.0.2.0/25]
// [192.0.2.128/25]
}
func ExamplePrefix_addressRangeSummarization() {
ps := ipaddr.Summarize(net.ParseIP("2001:db8::1"), net.ParseIP("2001:db8::8000"))
for _, p := range ps {
fmt.Println(p)
}
// Output:
// 2001:db8::1/128
// 2001:db8::2/127
// 2001:db8::4/126
// 2001:db8::8/125
// 2001:db8::10/124
// 2001:db8::20/123
// 2001:db8::40/122
// 2001:db8::80/121
// 2001:db8::100/120
// 2001:db8::200/119
// 2001:db8::400/118
// 2001:db8::800/117
// 2001:db8::1000/116
// 2001:db8::2000/115
// 2001:db8::4000/114
// 2001:db8::8000/128
}