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/*
Example of how to extend github.com/yl2chen/cidranger
This adds ASN as a string field, along with methods to get the ASN and the CIDR as strings
Thank you to yl2chen for his assistance and work on this library
*/
package main
import (
"fmt"
"net"
"os"
"github.com/yl2chen/cidranger"
)
// custom structure that conforms to RangerEntry interface
type customRangerEntry struct {
ipNet net.IPNet
asn string
}
// get function for network
func (b *customRangerEntry) Network() net.IPNet {
return b.ipNet
}
// get function for network converted to string
func (b *customRangerEntry) NetworkStr() string {
return b.ipNet.String()
}
// get function for ASN
func (b *customRangerEntry) Asn() string {
return b.asn
}
// create customRangerEntry object using net and asn
func newCustomRangerEntry(ipNet net.IPNet, asn string) cidranger.RangerEntry {
return &customRangerEntry{
ipNet: ipNet,
asn: asn,
}
}
// entry point
func main() {
// instantiate NewPCTrieRanger
ranger := cidranger.NewPCTrieRanger()
// Load sample data using our custom function
_, network, _ := net.ParseCIDR("192.168.1.0/24")
ranger.Insert(newCustomRangerEntry(*network, "0001"))
_, network, _ = net.ParseCIDR("128.168.1.0/24")
ranger.Insert(newCustomRangerEntry(*network, "0002"))
// Check if IP is contained within ranger
contains, err := ranger.Contains(net.ParseIP("128.168.1.7"))
if err != nil {
fmt.Println("ranger.Contains()", err.Error())
os.Exit(1)
}
fmt.Println("Contains:", contains)
// request networks containing this IP
ip := "192.168.1.42"
entries, err := ranger.ContainingNetworks(net.ParseIP(ip))
if err != nil {
fmt.Println("ranger.ContainingNetworks()", err.Error())
os.Exit(1)
}
fmt.Printf("Entries for %s:\n", ip)
for _, e := range entries {
// Cast e (cidranger.RangerEntry to struct customRangerEntry
entry, ok := e.(*customRangerEntry)
if !ok {
continue
}
// Get network (converted to string by function)
n := entry.NetworkStr()
// Get ASN
a := entry.Asn()
// Display
fmt.Println("\t", n, a)
}
}
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