From ce5ca860e98de63570df64f12daa81be7ae82a28 Mon Sep 17 00:00:00 2001
From: Omar Tariq <65053572+OmarTariq612@users.noreply.github.com>
Date: Mon, 8 Aug 2022 03:13:40 +0200
Subject: [PATCH] using send() instead of sendto()

chaning sendto() function call into send() as it's being used on a tcp socket.
"If sendto() is used on a connection-mode (SOCK_STREAM,  SOCK_SEQPACKET) socket,  the arguments dest_addr and addrlen are ignored (and the error EISCONN may be returned when they are not NULL and 0)" from Linux Programmer's Manual.
---
 udptunnel.c | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/udptunnel.c b/udptunnel.c
index 8dd9c17..f5b6b5b 100644
--- a/udptunnel.c
+++ b/udptunnel.c
@@ -379,9 +379,7 @@ static void tcp_to_udp(struct relay *relay)
 
 static void send_handshake(struct relay *relay)
 {
-    if (sendto(relay->tcp_sock, relay->handshake, sizeof(relay->handshake), 0,
-	       (struct sockaddr *) &relay->remote_udpaddr,
-	       sizeof(relay->remote_udpaddr)) < 0)
+    if (send(relay->tcp_sock, relay->handshake, sizeof(relay->handshake), 0) < 0)
 	err_sys("sendto(tcp, handshake)");
 }