From 51acb54760dc91095d59839e8ea2256557f42781 Mon Sep 17 00:00:00 2001 From: Sam Roberts Date: Fri, 17 Jun 2011 13:51:34 -0700 Subject: Stop returning an error after successful send of zero length UDP packets A zero-length send is invalid with TCP, but well defined with UDP. udp:send"" was returning (nil,"refused"), indicating that it failed when the packet was actually sent. The test script reproduces the bug, and includes a tcpdump of the zero length packet being sent. --- test/udp-zero-length-send | 25 +++++++++++++++++++++++++ 1 file changed, 25 insertions(+) create mode 100755 test/udp-zero-length-send (limited to 'test') diff --git a/test/udp-zero-length-send b/test/udp-zero-length-send new file mode 100755 index 0000000..a594944 --- /dev/null +++ b/test/udp-zero-length-send @@ -0,0 +1,25 @@ +#!/usr/bin/lua + +--[[ +Show that luasocket returns an error message on zero-length UDP sends, +even though the send is valid, and in fact the UDP packet is sent +to the peer: + +% sudo tcpdump -i lo -n +tcpdump: verbose output suppressed, use -v or -vv for full protocol decode +listening on lo, link-type EN10MB (Ethernet), capture size 65535 bytes +13:40:16.652808 IP 127.0.0.1.56573 > 127.0.0.1.5432: UDP, length 0 + +]] + +require"socket" + +s = assert(socket.udp()) +r = assert(socket.udp()) +assert(r:setsockname("*", 5432)) +assert(s:setpeername("127.0.0.1", 5432)) + +ssz, emsg = s:send("") + +print(ssz == 0 and "OK" or "FAIL",[[send:("")]], ssz, emsg) + -- cgit v1.2.3-55-g6feb