2021-11-10 12:25:10 +08:00
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package task
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2021-11-10 18:47:21 +08:00
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import (
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"bufio"
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"log"
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"math/rand"
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"net"
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"os"
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"strconv"
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"strings"
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"time"
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)
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const defaultInputFile = "ip.txt"
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2021-11-10 12:25:10 +08:00
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var (
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// IPv6 IP version is 6
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IPv6 = false
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2021-11-10 17:12:12 +08:00
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// TestAll test all ip
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TestAll = false
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// IPFile is the filename of IP Rangs
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2021-11-10 18:47:21 +08:00
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IPFile = defaultInputFile
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2021-11-10 12:25:10 +08:00
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)
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2021-11-10 18:47:21 +08:00
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2021-11-12 00:14:10 +08:00
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func randIPEndWith(num byte) byte {
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2021-11-10 18:47:21 +08:00
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rand.Seed(time.Now().UnixNano())
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2021-11-12 00:14:10 +08:00
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return byte(rand.Intn(int(num)))
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2021-11-10 18:47:21 +08:00
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}
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2021-11-12 00:14:10 +08:00
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type IPRanges struct {
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ips []*net.IPAddr
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mask string
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firstIP net.IP
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ipNet *net.IPNet
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}
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func newIPRanges() *IPRanges {
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return &IPRanges{
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ips: make([]*net.IPAddr, 0),
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2021-11-10 18:47:21 +08:00
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}
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2021-11-12 00:14:10 +08:00
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}
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func (r *IPRanges) fixIP(ip string) string {
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// 如果不含有 '/' 则代表不是 IP 段,而是一个单独的 IP,因此需要加上 /32 /128 子网掩码
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if i := strings.IndexByte(ip, '/'); i < 0 {
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r.mask = "/32"
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2021-11-10 18:47:21 +08:00
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if IPv6 {
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2021-11-12 00:14:10 +08:00
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r.mask = "/128"
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2021-11-10 18:47:21 +08:00
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}
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2021-11-12 00:14:10 +08:00
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ip += r.mask
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} else {
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r.mask = ip[i:]
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2021-11-10 23:58:40 +08:00
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}
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2021-11-12 00:14:10 +08:00
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return ip
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2021-11-10 23:58:40 +08:00
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}
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2021-11-12 00:14:10 +08:00
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func (r *IPRanges) parseCIDR(ip string) {
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var err error
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if r.firstIP, r.ipNet, err = net.ParseCIDR(r.fixIP(ip)); err != nil {
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log.Fatalln("ParseCIDR err", err)
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}
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}
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func (r *IPRanges) appendIPv4(d byte) {
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r.appendIP(net.IPv4(r.firstIP[12], r.firstIP[13], r.firstIP[14], d))
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}
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func (r *IPRanges) appendIP(ip net.IP) {
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r.ips = append(r.ips, &net.IPAddr{IP: ip})
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}
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// 返回第四段 ip 的最小值及可用数目
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func (r *IPRanges) getIPRange() (minIP, hosts byte) {
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minIP = r.firstIP[15] & r.ipNet.Mask[3] // IP 第四段最小值
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// 根据子网掩码获取主机数量
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m := net.IPv4Mask(255, 255, 255, 255)
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for i, v := range r.ipNet.Mask {
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m[i] ^= v
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}
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total, _ := strconv.ParseInt(m.String(), 16, 32) // 总可用 IP 数
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if total > 255 { // 矫正 第四段 可用 IP 数
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hosts = 255
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return
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}
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if total == 0 {
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hosts = 1
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return
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2021-11-10 23:58:40 +08:00
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}
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2021-11-12 00:14:10 +08:00
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hosts = byte(total)
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return
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}
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func (r *IPRanges) chooseIPv4() {
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minIP, hosts := r.getIPRange()
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for r.ipNet.Contains(r.firstIP) {
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2021-11-10 23:58:40 +08:00
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if TestAll { // 如果是测速全部 IP
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2021-11-13 18:27:11 +08:00
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for i := 0; i <= int(hosts); i++ { // 遍历 IP 最后一段最小值到最大值
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r.appendIPv4(byte(i) + minIP)
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2021-11-10 18:47:21 +08:00
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}
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2021-11-10 23:58:40 +08:00
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} else { // 随机 IP 的最后一段 0.0.0.X
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2021-11-12 00:14:10 +08:00
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r.appendIPv4(minIP + randIPEndWith(hosts))
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}
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r.firstIP[14]++ // 0.0.(X+1).X
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if r.firstIP[14] == 0 {
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r.firstIP[13]++ // 0.(X+1).X.X
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if r.firstIP[13] == 0 {
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r.firstIP[12]++ // (X+1).X.X.X
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2021-11-10 18:47:21 +08:00
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}
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}
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}
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}
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2021-11-12 00:14:10 +08:00
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func (r *IPRanges) chooseIPv6() {
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var tempIP uint8
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2021-11-12 00:14:10 +08:00
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for r.ipNet.Contains(r.firstIP) {
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2021-11-10 18:47:21 +08:00
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//fmt.Println(firstIP)
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//fmt.Println(firstIP[0], firstIP[1], firstIP[2], firstIP[3], firstIP[4], firstIP[5], firstIP[6], firstIP[7], firstIP[8], firstIP[9], firstIP[10], firstIP[11], firstIP[12], firstIP[13], firstIP[14], firstIP[15])
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2021-11-14 14:04:31 +08:00
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if r.mask != "/128" {
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2021-11-12 00:14:10 +08:00
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r.firstIP[15] = randIPEndWith(255) // 随机 IP 的最后一段
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r.firstIP[14] = randIPEndWith(255) // 随机 IP 的最后一段
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}
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2021-11-12 17:58:13 +08:00
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targetIP := make([]byte, len(r.firstIP))
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copy(targetIP, r.firstIP)
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r.appendIP(targetIP)
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for i := 13; i >= 0; i-- {
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tempIP = r.firstIP[i]
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r.firstIP[i] += randIPEndWith(255)
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if r.firstIP[i] >= tempIP {
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break
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}
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2021-11-10 18:47:21 +08:00
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}
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}
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}
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2021-11-12 00:14:10 +08:00
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func loadIPRanges() []*net.IPAddr {
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if IPFile == "" {
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IPFile = defaultInputFile
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2021-11-10 18:47:21 +08:00
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}
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2021-11-12 00:14:10 +08:00
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file, err := os.Open(IPFile)
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if err != nil {
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log.Fatal(err)
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2021-11-10 18:47:21 +08:00
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}
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2021-11-12 00:14:10 +08:00
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defer file.Close()
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ranges := newIPRanges()
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scanner := bufio.NewScanner(file)
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for scanner.Scan() {
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ranges.parseCIDR(scanner.Text())
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if IPv6 {
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ranges.chooseIPv6()
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continue
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}
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ranges.chooseIPv4()
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2021-11-10 23:58:40 +08:00
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}
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2021-11-12 00:14:10 +08:00
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return ranges.ips
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2021-11-10 18:47:21 +08:00
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}
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