From 06154d11edd50cce9c9d0999b7cfd453ac075397 Mon Sep 17 00:00:00 2001 From: Dingjun Date: Wed, 13 Sep 2017 15:12:11 +0800 Subject: [PATCH] first version --- LICENSE | 166 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++ README | 26 +++++++++ main.go | 166 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 358 insertions(+) create mode 100644 LICENSE create mode 100644 README create mode 100644 main.go diff --git a/LICENSE b/LICENSE new file mode 100644 index 0000000..341c30b --- /dev/null +++ b/LICENSE @@ -0,0 +1,166 @@ + GNU LESSER GENERAL PUBLIC LICENSE + Version 3, 29 June 2007 + + Copyright (C) 2007 Free Software Foundation, Inc. + 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. + + 0. 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If the Library as you +received it does not specify a version number of the GNU Lesser +General Public License, you may choose any version of the GNU Lesser +General Public License ever published by the Free Software Foundation. + + If the Library as you received it specifies that a proxy can decide +whether future versions of the GNU Lesser General Public License shall +apply, that proxy's public statement of acceptance of any version is +permanent authorization for you to choose that version for the +Library. + diff --git a/README b/README new file mode 100644 index 0000000..13c240d --- /dev/null +++ b/README @@ -0,0 +1,26 @@ +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 + diff --git a/main.go b/main.go new file mode 100644 index 0000000..6cd93e2 --- /dev/null +++ b/main.go @@ -0,0 +1,166 @@ +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 - <