dnsxl/cmd/example/example.go

64 lines
1.2 KiB
Go
Raw Permalink Normal View History

2023-09-20 12:21:59 +01:00
/*
example is a short example program showing the detailed result from a lookup.
*/
package main
import (
"context"
"fmt"
"net"
"os"
"src.lwithers.me.uk/go/dnsxl"
)
var (
xlist *dnsxl.XList
)
func main() {
if len(os.Args) < 2 {
fmt.Fprintln(os.Stderr, "Expecting one or more names/IPs to look up")
os.Exit(1)
}
xlist = dnsxl.New(nil)
xlist.AddServers("sbl.spamhaus.org", "xbl.spamhaus.org", "pbl.spamhaus.org")
for i := 1; i < len(os.Args); i++ {
lookup(os.Args[i])
}
}
func lookup(name string) {
fmt.Printf("==== %s ====\n", name)
ips, err := net.DefaultResolver.LookupIP(context.Background(), "ip", name)
switch {
case err != nil:
fmt.Printf("Failed to look up name: %v\n", err)
return
case len(ips) == 0:
fmt.Println("No addresses found for name")
return
}
for _, ip := range ips {
fmt.Printf("--- %s\n", ip)
res, err := xlist.LookupIP(ip)
if err != nil {
fmt.Printf("Failed to look up IP: %v\n", err)
continue
}
for _, r := range res {
switch {
case r.Error != nil:
fmt.Printf("%s\tError: %v\n", r.Server, r.Error)
case r.InList:
fmt.Printf("%s\tEntry in list (reason: %q)\n", r.Server, r.Reason)
default:
fmt.Printf("%s\tEntry not in list\n", r.Server)
}
}
}
}