可设置是否隐匿目的IP

README.md

@@ -227,6 +227,8 @@ nexttrace --parallel-requests 1 www.hkix.net
 
 # Start Trace with TTL of 5, end at TTL of 10
 nexttrace --first 5 --max-hops 10 www.decix.net
+# In addition, an ENV is provided to set whether to hide the destination IP
+export NEXTTRACE_ENABLEHIDDENDSTIP=1
 
 # Turn off the IP reverse parsing function
 nexttrace --no-rdns www.bbix.net

README_zh_CN.md

@@ -243,6 +243,8 @@ nexttrace --parallel-requests 1 www.hkix.net
 
 # 从TTL为5开始发送探测包，直到TTL为10结束
 nexttrace --first 5 --max-hops 10 www.decix.net
+# 此外还提供了一个ENV，可以设置是否隐匿目的IP
+export NEXTTRACE_ENABLEHIDDENDSTIP=1
 
 # 关闭IP反向解析功能
 nexttrace --no-rdns www.bbix.net

cmd/cmd.go

@@ -245,6 +245,7 @@ func Excute() {
 		*port = 53
 	}
 
+	util.DestIP = ip.String()
 	var conf = trace.Config{
 		DN42:             *dn42,
 		SrcAddr:          *srcAddr,

printer/basic.go

@@ -4,6 +4,7 @@ import (
 	"fmt"
 	"github.com/nxtrace/NTrace-core/config"
 	"github.com/nxtrace/NTrace-core/trace"
+	"github.com/nxtrace/NTrace-core/util"
 	"net"
 
 	"github.com/fatih/color"
@@ -78,11 +79,14 @@ func sponsor() {
 
 func PrintTraceRouteNav(ip net.IP, domain string, dataOrigin string, maxHops int, packetSize int) {
 	fmt.Println("IP Geo Data Provider: " + dataOrigin)
-
-	if ip.String() == domain {
-		fmt.Printf("traceroute to %s, %d hops max, %d bytes packets\n", ip.String(), maxHops, packetSize)
+	if util.EnableHidDstIP == "" {
+		if ip.String() == domain {
+			fmt.Printf("traceroute to %s, %d hops max, %d bytes packets\n", ip.String(), maxHops, packetSize)
+		} else {
+			fmt.Printf("traceroute to %s (%s), %d hops max, %d bytes packets\n", ip.String(), domain, maxHops, packetSize)
+		}
 	} else {
-		fmt.Printf("traceroute to %s (%s), %d hops max, %d bytes packets\n", ip.String(), domain, maxHops, packetSize)
+		fmt.Printf("traceroute to %s, %d hops max, %d bytes packets\n", util.HideIPPart(ip.String()), maxHops, packetSize)
 	}
 }
 

printer/realtime_printer.go

@@ -2,6 +2,7 @@ package printer
 
 import (
 	"fmt"
+	"github.com/nxtrace/NTrace-core/util"
 	"net"
 	"strconv"
 	"strings"
@@ -12,7 +13,6 @@ import (
 
 func RealtimePrinter(res *trace.Result, ttl int) {
 	fmt.Printf("%s  ", color.New(color.FgHiYellow, color.Bold).Sprintf("%-2d", ttl+1))
-
 	// 去重
 	var latestIP string
 	tmpMap := make(map[string][]string)
@@ -51,13 +51,25 @@ func RealtimePrinter(res *trace.Result, ttl int) {
 			fmt.Printf("%4s", "")
 		}
 		if net.ParseIP(ip).To4() == nil {
-			fmt.Fprintf(color.Output, "%s",
-				color.New(color.FgWhite, color.Bold).Sprintf("%-25s", ip),
-			)
+			if util.EnableHidDstIP == "" || ip != util.DestIP {
+				fmt.Fprintf(color.Output, "%s",
+					color.New(color.FgWhite, color.Bold).Sprintf("%-25s", ip),
+				)
+			} else {
+				fmt.Fprintf(color.Output, "%s",
+					color.New(color.FgWhite, color.Bold).Sprintf("%-25s", util.HideIPPart(ip)),
+				)
+			}
 		} else {
-			fmt.Fprintf(color.Output, "%s",
-				color.New(color.FgWhite, color.Bold).Sprintf("%-15s", ip),
-			)
+			if util.EnableHidDstIP == "" || ip != util.DestIP {
+				fmt.Fprintf(color.Output, "%s",
+					color.New(color.FgWhite, color.Bold).Sprintf("%-15s", ip),
+				)
+			} else {
+				fmt.Fprintf(color.Output, "%s",
+					color.New(color.FgWhite, color.Bold).Sprintf("%-15s", util.HideIPPart(ip)),
+				)
+			}
 		}
 
 		i, _ := strconv.Atoi(v[0])

util/util.go

@@ -22,6 +22,8 @@ var UserAgent = fmt.Sprintf("NextTrace %s/%s/%s", config.Version, runtime.GOOS,
 var RdnsCache sync.Map
 var PowProviderParam = ""
 var DisableMPLS = GetenvDefault("NEXTTRACE_DISABLEMPLS", "")
+var EnableHidDstIP = GetenvDefault("NEXTTRACE_ENABLEHIDDENDSTIP", "")
+var DestIP string
 
 func LookupAddr(addr string) ([]string, error) {
 	// 如果在缓存中找到，直接返回
@@ -226,3 +228,17 @@ func StringInSlice(val string, list []string) bool {
 	}
 	return false
 }
+
+func HideIPPart(ip string) string {
+	parsedIP := net.ParseIP(ip)
+	if parsedIP == nil {
+		return ""
+	}
+
+	if parsedIP.To4() != nil {
+		// IPv4: 隐藏后16位
+		return strings.Join(strings.Split(ip, ".")[:2], ".") + ".0.0/16"
+	}
+	// IPv6: 隐藏后96位
+	return parsedIP.Mask(net.CIDRMask(32, 128)).String() + "/32"
+}