*** This bug is a duplicate of bug 1849653 ***
https://bugs.launchpad.net/bugs/1849653
Public bug reported:
Versions of related software:
Ubuntu:
Description: Ubuntu 18.04.3 LTS
Release: 18.04
Lua interpreter & lua-socket:
lua5.3/bionic-updates,bionic-security,now 5.3.3-1ubuntu0.18.04.1 amd64
[installed]
lua-socket/bionic,now 3.0~rc1+git+ac3201d-4 amd64 [installed]
Description of a bug:
When i was trying to send something using UDP with a lua-socket library and
sendto the call was always failing.
I found out that normal send is working.
I'am attaching application for test.
On one console you should run netcat: nc -luk -p 9500
On the second console you should run socket-test.lua (first param tells what
kind of
function to use, see an attached by me code snippet):
stanislawb@stanislawb:~/lua$ ./socket-test.lua send
Using send
ret= true
err= 16.0
msg= nil
stanislawb@stanislawb:~/lua$ ./socket-test.lua
Using sendto
ret= true
err= nil
msg= refused
When using send we see that data is going to netcat, using sendto fails
(no data in netcat).
I have strace both cases:
stanislawb@stanislawb:~/lua$ strace -e network -f ./socket-test.lua send
socket(AF_UNIX, SOCK_STREAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0) = 3
connect(3, {sa_family=AF_UNIX, sun_path="/var/run/nscd/socket"}, 110) = -1
ENOENT (No such file or directory)
socket(AF_UNIX, SOCK_STREAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0) = 3
connect(3, {sa_family=AF_UNIX, sun_path="/var/run/nscd/socket"}, 110) = -1
ENOENT (No such file or directory)
Using send
socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP) = 3
connect(3, {sa_family=AF_INET, sin_port=htons(9500),
sin_addr=inet_addr("127.0.0.1")}, 16) = 0
sendto(3, "test12356788888\n", 16, 0, NULL, 0) = 16
ret= true
err= 16.0
msg= nil
+++ exited with 0 +++
stanislawb@stanislawb:~/lua$ strace -e network -f ./socket-test.lua
socket(AF_UNIX, SOCK_STREAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0) = 3
connect(3, {sa_family=AF_UNIX, sun_path="/var/run/nscd/socket"}, 110) = -1
ENOENT (No such file or directory)
socket(AF_UNIX, SOCK_STREAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0) = 3
connect(3, {sa_family=AF_UNIX, sun_path="/var/run/nscd/socket"}, 110) = -1
ENOENT (No such file or directory)
Using sendto
ret= true
err= nil
msg= refused
+++ exited with 0 +++
So we see that sendto is even not opening the socket using a socket()
call.
I would add that version of lua-socket downloaded from:
git clone https://github.com/diegonehab/luasocket.git
and compiled is working as desired.
** Affects: luasocket (Ubuntu)
Importance: Undecided
Status: New
** Tags: lua
** Attachment added: "Test application"
https://bugs.launchpad.net/bugs/1849654/+attachment/5299676/+files/socket-test.lua
** This bug has been marked a duplicate of bug 1849653
lua:socket udp.sendto is not working at all
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https://bugs.launchpad.net/bugs/1849654
Title:
lua:socket udp.sendto is not working at all
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