From: Jason A. Donenfeld <Jason@zx2c4.com>
Date: Sun, 25 Aug 2019 18:45:13 +0000 (-0600)
Subject: device: getsockname on linux to determine port
X-Git-Tag: 0.0.20190908~24
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=f8198c042810b2c512c610654272db845e32b75e;p=thirdparty%2Fwireguard-go.git

device: getsockname on linux to determine port

It turns out Go isn't passing the pointer properly so we wound up with a
zero port every time.
---

diff --git a/device/conn_linux.go b/device/conn_linux.go
index ebbbe11..f74ad51 100644
--- a/device/conn_linux.go
+++ b/device/conn_linux.go
@@ -391,6 +391,11 @@ func create4(port uint16) (int, uint16, error) {
 		return FD_ERR, 0, err
 	}
 
+	sa, err := unix.Getsockname(fd)
+	if err == nil {
+		addr.Port = sa.(*unix.SockaddrInet4).Port
+	}
+
 	return fd, uint16(addr.Port), err
 }
 
@@ -450,6 +455,11 @@ func create6(port uint16) (int, uint16, error) {
 		return FD_ERR, 0, err
 	}
 
+	sa, err := unix.Getsockname(fd)
+	if err == nil {
+		addr.Port = sa.(*unix.SockaddrInet6).Port
+	}
+
 	return fd, uint16(addr.Port), err
 }