[PATCH 1/2] nping: bind to interface on Linux for IPv4 send-ip

[ValdikSS via dev <dev () nmap org>]

Linux RAW sockets need to be bound to interface, if the interface is
L3 tunnel (OpenVPN TUN for example).
Otherwise the packet goes via default route, regardless of
`--interface` or `--source-ip` options.
---
 nping/ProbeMode.cc | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/nping/ProbeMode.cc b/nping/ProbeMode.cc
index 199329b40..382b330c4 100644
--- a/nping/ProbeMode.cc
+++ b/nping/ProbeMode.cc
@@ -807,6 +807,15 @@ int ProbeMode::fillPacketTCP(NpingTarget *target, u16 port, u8 *buff, int buffle
         }else{
             t.setSum();
         }
+
+        /* Bind IPv4 socket to a specific network interface */
+        if ( o.issetDevice() )  {
+            if (socket_bindtodevice(rawfd, o.getDevice()))
+            {
+                nping_warning(QT_2, "Error binding IPv4 socket to device %s", o.getDevice() );
+            }
+        }
+
         /* Store result in user supplied buffer */
         *filledlen = i.dumpToBinaryBuffer(buff, bufflen);
 
-- 
2.45.2

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