From 7473a7604ac351f105da1a740d0a08fb9ea4bd7d Mon Sep 17 00:00:00 2001
From: mangoyhuang <mangoyhuang@tencent.com>
Date: Thu, 27 Apr 2023 10:55:50 +0800
Subject: [PATCH 1/3] set PingOverIface forcedly, add option to ignore ipnet
 check

---
 arping.go   |  4 ++--
 netutils.go | 19 ++++++++++++++++---
 2 files changed, 18 insertions(+), 5 deletions(-)

diff --git a/arping.go b/arping.go
index b305731..b689be2 100644
--- a/arping.go
+++ b/arping.go
@@ -102,14 +102,14 @@ func PingOverIfaceByName(dstIP net.IP, ifaceName string) (net.HardwareAddr, time
 	return PingOverIface(dstIP, *iface)
 }
 
-// PingOverIface sends an arp ping over interface 'iface' to 'dstIP'
+// PingOverIface forcedly sends an arp ping over interface 'iface' to 'dstIP'
 func PingOverIface(dstIP net.IP, iface net.Interface) (net.HardwareAddr, time.Duration, error) {
 	if err := validateIP(dstIP); err != nil {
 		return nil, 0, err
 	}
 
 	srcMac := iface.HardwareAddr
-	srcIP, err := findIPInNetworkFromIface(dstIP, iface)
+	srcIP, err := findIPInNetworkFromIface(dstIP, iface, true)
 	if err != nil {
 		return nil, 0, err
 	}
diff --git a/netutils.go b/netutils.go
index 2b707d3..6885f71 100644
--- a/netutils.go
+++ b/netutils.go
@@ -6,20 +6,33 @@ import (
 	"net"
 )
 
-func findIPInNetworkFromIface(dstIP net.IP, iface net.Interface) (net.IP, error) {
+// findIPInNetworkFromIface find an ip from iface as src
+func findIPInNetworkFromIface(dstIP net.IP, iface net.Interface, ignoreNet bool) (net.IP, error) {
 	addrs, err := iface.Addrs()
 
 	if err != nil {
 		return nil, err
 	}
 
-	for _, a := range addrs {
+	if len(addrs) == 0 {
+		return nil, fmt.Errorf("iface: '%s' do not contains any ip", iface.Name)
+	}
+
+	var firstIP net.IP
+	for i, a := range addrs {
 		if ipnet, ok := a.(*net.IPNet); ok {
 			if ipnet.Contains(dstIP) {
 				return ipnet.IP, nil
 			}
+			if i == 0 {
+				firstIP = ipnet.IP
+			}
 		}
 	}
+
+	if ignoreNet {
+		return firstIP, nil
+	}
 	return nil, fmt.Errorf("iface: '%s' can't reach ip: '%s'", iface.Name, dstIP)
 }
 
@@ -35,7 +48,7 @@ func findUsableInterfaceForNetwork(dstIP net.IP) (*net.Interface, error) {
 	}
 
 	hasAddressInNetwork := func(iface net.Interface) bool {
-		if _, err := findIPInNetworkFromIface(dstIP, iface); err != nil {
+		if _, err := findIPInNetworkFromIface(dstIP, iface, false); err != nil {
 			return false
 		}
 		return true

From b3881a7909d9394e3af64caf2bef43301c56d588 Mon Sep 17 00:00:00 2001
From: mangoyhuang <mangoyhuang@tencent.com>
Date: Thu, 27 Apr 2023 11:01:58 +0800
Subject: [PATCH 2/3] update go mod

---
 go.mod | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/go.mod b/go.mod
index 04c772b..17ec164 100644
--- a/go.mod
+++ b/go.mod
@@ -1,3 +1,3 @@
-module github.com/j-keck/arping
+module github.com/fzu-huang/arping
 
-go 1.12
+go 1.17

From 929de1889816fdf3e58f3b1051dc1e702e06560a Mon Sep 17 00:00:00 2001
From: mangoyhuang <mangoyhuang@tencent.com>
Date: Thu, 27 Apr 2023 17:39:17 +0800
Subject: [PATCH 3/3] fix import

---
 cmd/arping/main.go | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/cmd/arping/main.go b/cmd/arping/main.go
index 8c1fb77..fc2cdcd 100644
--- a/cmd/arping/main.go
+++ b/cmd/arping/main.go
@@ -24,10 +24,11 @@ package main
 import (
 	"flag"
 	"fmt"
-	"github.com/j-keck/arping"
 	"net"
 	"os"
 	"time"
+
+	"github.com/fzu-huang/arping"
 )
 
 var (