mirror of https://github.com/v2ray/v2ray-core
61 lines
1.2 KiB
Go
61 lines
1.2 KiB
Go
package main
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import (
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"bufio"
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"fmt"
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"math"
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"net"
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"net/http"
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"strconv"
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"strings"
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v2net "github.com/v2ray/v2ray-core/common/net"
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)
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const (
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apnicFile = "http://ftp.apnic.net/apnic/stats/apnic/delegated-apnic-latest"
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)
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func main() {
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resp, err := http.Get(apnicFile)
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if err != nil {
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panic(err)
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}
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if resp.StatusCode != 200 {
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panic(fmt.Errorf("Unexpected status %d", resp.StatusCode))
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}
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defer resp.Body.Close()
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scanner := bufio.NewScanner(resp.Body)
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ipNet := v2net.NewIPNet()
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for scanner.Scan() {
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line := scanner.Text()
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line = strings.TrimSpace(line)
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parts := strings.Split(line, "|")
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if len(parts) < 5 {
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continue
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}
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if strings.ToLower(parts[1]) != "cn" || strings.ToLower(parts[2]) != "ipv4" {
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continue
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}
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ip := parts[3]
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count, err := strconv.Atoi(parts[4])
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if err != nil {
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continue
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}
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mask := 32 - int(math.Floor(math.Log2(float64(count))+0.5))
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cidr := fmt.Sprintf("%s/%d", ip, mask)
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_, t, err := net.ParseCIDR(cidr)
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if err != nil {
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panic(err)
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}
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ipNet.Add(t)
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}
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dump := ipNet.Serialize()
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fmt.Println("map[uint32]byte {")
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for i := 0; i < len(dump); i += 2 {
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fmt.Println(dump[i], ": ", dump[i+1], ",")
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}
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fmt.Println("}")
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}
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