From 1789448d6c995ec9cd747fb3b8295c40370a42cd Mon Sep 17 00:00:00 2001
From: sjlleo <sjlleo001@gmail.com>
Date: Fri, 10 Jun 2022 21:20:43 +0800
Subject: [PATCH] =?UTF-8?q?add:=20=E6=96=B0=E5=A2=9E=E8=B5=B7=E5=A7=8BTTL?=
 =?UTF-8?q?=E5=8F=82=E6=95=B0?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 fast_trace/fast_trace.go | 1 +
 main.go                  | 2 ++
 trace/icmp_ipv4.go       | 2 +-
 trace/icmp_ipv6.go       | 2 +-
 trace/tcp_ipv4.go        | 2 +-
 trace/trace.go           | 1 +
 6 files changed, 7 insertions(+), 3 deletions(-)

diff --git a/fast_trace/fast_trace.go b/fast_trace/fast_trace.go
index e82f0b1..a04f03f 100644
--- a/fast_trace/fast_trace.go
+++ b/fast_trace/fast_trace.go
@@ -20,6 +20,7 @@ func (f *FastTracer) tracert(location string, ispCollection ISPCollection) {
 	fmt.Printf("traceroute to %s, 30 hops max, 32 byte packets\n", ispCollection.IP)
 	ip := net.ParseIP(ispCollection.IP)
 	var conf = trace.Config{
+		BeginHop:         1,
 		DestIP:           ip,
 		DestPort:         80,
 		MaxHops:          30,
diff --git a/main.go b/main.go
index 45a989e..7cc0547 100644
--- a/main.go
+++ b/main.go
@@ -29,6 +29,7 @@ var dataOrigin = fSet.String("d", "LeoMoeAPI", "Choose IP Geograph Data Provider
 var noRdns = fSet.Bool("n", false, "Disable IP Reverse DNS lookup")
 var routePath = fSet.Bool("report", false, "Route Path")
 var tablePrint = fSet.Bool("table", false, "Output trace results as table")
+var beginHop = fSet.Int("b", 1, "Set The Begin TTL")
 var ver = fSet.Bool("V", false, "Print Version")
 
 func printArgHelp() {
@@ -105,6 +106,7 @@ func main() {
 	}
 
 	var conf = trace.Config{
+		BeginHop:         *beginHop,
 		DestIP:           ip,
 		DestPort:         *port,
 		MaxHops:          *maxHops,
diff --git a/trace/icmp_ipv4.go b/trace/icmp_ipv4.go
index 8ba96fd..4eaca37 100644
--- a/trace/icmp_ipv4.go
+++ b/trace/icmp_ipv4.go
@@ -45,7 +45,7 @@ func (t *ICMPTracer) Execute() (*Result, error) {
 
 	go t.listenICMP()
 
-	for ttl := 1; ttl <= t.MaxHops; ttl++ {
+	for ttl := t.BeginHop; ttl <= t.MaxHops; ttl++ {
 		if t.final != -1 && ttl > t.final {
 			break
 		}
diff --git a/trace/icmp_ipv6.go b/trace/icmp_ipv6.go
index d6849d4..ca3a65c 100644
--- a/trace/icmp_ipv6.go
+++ b/trace/icmp_ipv6.go
@@ -44,7 +44,7 @@ func (t *ICMPTracerv6) Execute() (*Result, error) {
 
 	go t.listenICMP()
 
-	for ttl := 1; ttl <= t.MaxHops; ttl++ {
+	for ttl := t.BeginHop; ttl <= t.MaxHops; ttl++ {
 		if t.final != -1 && ttl > t.final {
 			break
 		}
diff --git a/trace/tcp_ipv4.go b/trace/tcp_ipv4.go
index 53f98b6..b0b7130 100644
--- a/trace/tcp_ipv4.go
+++ b/trace/tcp_ipv4.go
@@ -63,7 +63,7 @@ func (t *TCPTracer) Execute() (*Result, error) {
 
 	t.sem = semaphore.NewWeighted(int64(t.ParallelRequests))
 
-	for ttl := 1; ttl <= t.MaxHops; ttl++ {
+	for ttl := t.BeginHop; ttl <= t.MaxHops; ttl++ {
 		// 如果到达最终跳，则退出
 		if t.final != -1 && ttl > t.final {
 			break
diff --git a/trace/trace.go b/trace/trace.go
index b54e394..4fcab44 100644
--- a/trace/trace.go
+++ b/trace/trace.go
@@ -16,6 +16,7 @@ var (
 )
 
 type Config struct {
+	BeginHop         int
 	MaxHops          int
 	NumMeasurements  int
 	ParallelRequests int