zyppe/luasocket
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions

Stop returning an error after successful send of zero length UDP packets

Browse source 
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.
This commit is contained in:
Sam Roberts 2011-06-17 13:51:34 -07:00
parent a8b19e5367
commit 51acb54760
2 changed files with 30 additions and 6 deletions
Download patch file Download diff file Expand all files Collapse all files

25
test/udp-zero-length-send Executable file
View file

@ -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)