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chnroutes-go
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166
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.
This version of the GNU Lesser General Public License incorporates
the terms and conditions of version 3 of the GNU General Public
License, supplemented by the additional permissions listed below.
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General Public License, and the "GNU GPL" refers to version 3 of the GNU
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other than an Application or a Combined Work as defined below.
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26
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

166
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)
}
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