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85 lines
1.4 KiB
Go
85 lines
1.4 KiB
Go
package main
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import (
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"bufio"
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"fmt"
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"github.com/miekg/dns"
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"log"
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"net"
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"os"
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"strings"
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"unicode"
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)
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// parse ip range region file
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// format
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// ip, netmask, prefixlen
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func parse_net(fn string) []*net.IPNet {
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fp, err := os.Open(fn)
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if err != nil {
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log.Fatal(err)
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return []*net.IPNet{}
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}
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defer fp.Close()
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nets := []*net.IPNet{}
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reader := bufio.NewReader(fp)
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for {
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line, err := reader.ReadString('\n')
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if err != nil {
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break
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}
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line = strings.Trim(line, "\r\n")
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fnds := strings.FieldsFunc(line, func(c rune) bool {
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if unicode.IsSpace(c) {
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return true
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}
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if c == ',' {
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return true
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}
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return false
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})
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if len(fnds) != 3 {
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continue
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}
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if _, net1, err := net.ParseCIDR(
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fmt.Sprintf("%s/%s", fnds[0], fnds[2])); err == nil {
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nets = append(nets, net1)
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} else {
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log.Fatal(err)
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}
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}
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return nets
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}
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// test ip in ip range region
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func in_region(ip net.IP, nets []*net.IPNet) bool {
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for _, n := range nets {
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if n.Contains(ip) {
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return true
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}
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}
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return false
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}
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// test dns reply A or AAAA in special ip range region
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func answer_in_region(m *dns.Msg, nets []*net.IPNet) bool {
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for _, rr := range m.Answer {
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if a, ok := rr.(*dns.A); ok {
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if in_region(a.A, nets) {
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return true
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}
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}
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if aaaa, ok := rr.(*dns.AAAA); ok {
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if in_region(aaaa.AAAA, nets) {
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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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