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LICENSE

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+                   GNU LESSER GENERAL PUBLIC LICENSE
+                       Version 3, 29 June 2007
+
+ Copyright (C) 2007 Free Software Foundation, Inc. <http://fsf.org/>
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
+
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+License, supplemented by the additional permissions listed below.
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+

README

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+chnroutes-go
+
+a tool to fetch china ip range from
+APNIC(http://ftp.apnic.net/apnic/stats/apnic/delegated-apnic-latest)
+
+usage
+
+   go get github.com/fangdingjun/chnroutes-go
+
+   $GOPATH/bin/chnroutes-go
+
+ 
+  after finished, there are 3 files generated
+
+
+  ipnet_cn.txt:  
+      the ip range, per line look like this
+            192.168.1.0/24
+
+  routes_add.sh:
+      a shell script to help to add route on Linux
+      use `ip route -batch` command
+
+  routes_del.sh
+      a shell script to help to delete route add by routes_add.sh
+

main.go

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+package main
+
+import (
+	"bufio"
+	"fmt"
+	"github.com/EvilSuperstars/go-cidrman"
+	"io"
+	"log"
+	"math"
+	"net"
+	"net/http"
+	"os"
+	"strconv"
+	"strings"
+)
+
+const (
+	ipdataurl = "http://ftp.apnic.net/apnic/stats/apnic/delegated-apnic-latest"
+)
+
+func getData(savefile string) error {
+	resp, err := http.Get(ipdataurl)
+	if err != nil {
+		return err
+	}
+	defer resp.Body.Close()
+
+	if resp.StatusCode != http.StatusOK {
+		return fmt.Errorf("http error %d", resp.StatusCode)
+	}
+
+	fp, err := os.Create(savefile)
+	if err != nil {
+		return err
+	}
+	defer fp.Close()
+
+	io.Copy(fp, resp.Body)
+
+	return nil
+}
+
+func numToMask(n int) int {
+	n1 := math.Log2(float64(n))
+	return 32 - int(n1)
+}
+
+func parseLine(l string) *net.IPNet {
+	ll := strings.Split(l, "|")
+	ipString := ll[3]
+	numString := ll[4]
+
+	ip := net.ParseIP(ipString)
+	n, err := strconv.Atoi(numString)
+	if ip == nil || err != nil {
+		return nil
+	}
+
+	prefixLen := numToMask(n)
+	mask := net.CIDRMask(prefixLen, 32)
+
+	return &net.IPNet{IP: ip, Mask: mask}
+}
+
+func parseData(fn string) []*net.IPNet {
+	fp, err := os.Open(fn)
+	if err != nil {
+		log.Println(err)
+		return nil
+	}
+	defer fp.Close()
+
+	ipnets := []*net.IPNet{}
+
+	r := bufio.NewReader(fp)
+	for {
+		line, err := r.ReadString('\n')
+		if err != nil {
+			if err != io.EOF {
+				log.Println(err)
+			}
+			break
+		}
+
+		if line[0] == '#' {
+			continue
+		}
+		if strings.HasPrefix(line, "apnic|CN|ipv4") {
+			ipnet := parseLine(line)
+			if ipnet != nil {
+				ipnets = append(ipnets, ipnet)
+			}
+		}
+	}
+	return ipnets
+}
+
+func writeRouteScriptLinux(ipnet []*net.IPNet) error {
+	fp, err := os.Create("routes_add.sh")
+	if err != nil {
+		return err
+	}
+	defer fp.Close()
+
+	fp1, err := os.Create("routes_del.sh")
+	if err != nil {
+		return err
+	}
+	defer fp1.Close()
+
+	fmt.Fprintf(fp, `#!/bin/bash
+# route has two formats
+#   1.2.3.4 dev ppp0  src 10.150.16.112
+#   1.2.3.4 via 192.168.1.1 dev eth0 src 192.168.1.160
+gw=$(ip route get 1.2.3.4 | awk '/1.2.3.4/{gsub("1.2.3.4", "");print}')
+ip -batch - <<EOF
+`)
+
+	fmt.Fprintf(fp1, "#!/bin/bash\n")
+	fmt.Fprintf(fp1, "ip -batch - <<EOF\n")
+
+	for _, n := range ipnet {
+		m, _ := n.Mask.Size()
+		fmt.Fprintf(fp, "route add %s/%d $gw\n", n.IP.String(), m)
+		fmt.Fprintf(fp1, "route del %s/%d\n", n.IP.String(), m)
+	}
+
+	fmt.Fprintf(fp, "EOF\n")
+	fmt.Fprintf(fp1, "EOF\n")
+
+	return nil
+}
+
+func writeIPNet(ipnet []*net.IPNet) error {
+	fp, err := os.Create("ipnet_cn.txt")
+	if err != nil {
+		return err
+	}
+	defer fp.Close()
+
+	for _, n := range ipnet {
+		m, _ := n.Mask.Size()
+		fmt.Fprintf(fp, "%s/%d\n", n.IP.String(), m)
+	}
+	return nil
+}
+
+func main() {
+	ipDataFile := "ip.txt"
+	if _, err := os.Stat(ipDataFile); err != nil {
+		if err1 := getData(ipDataFile); err1 != nil {
+			log.Println(err)
+			os.Exit(1)
+		}
+	}
+
+	ipnet := parseData(ipDataFile)
+
+	mergedIPNet, err := cidrman.MergeIPNets(ipnet)
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	writeIPNet(mergedIPNet)
+	writeRouteScriptLinux(mergedIPNet)
+}