https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=270498
Bug ID: 270498
Summary: libc DNS resolver ignore timeout with tcp
Product: Base System
Version: 13.1-RELEASE
Hardware: Any
OS: Any
Status: New
Severity: Affects Many People
Priority: ---
Component: bin
Assignee: [email protected]
Reporter: [email protected]
Created attachment 241157
--> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=241157&action=edit
test program to reproduce the issue
The libc resolver functions don't use the timeout with TCP connections.
If a TCP connection hangs to the configured name server, the name resolution
functions will wait indefinitely and never return to the caller.
The timeout option should be used for tcp queries like for udp queries.
It looks like linux glibc as the same bug for years
https://sourceware.org/bugzilla/show_bug.cgi?id=19643 .
I reproduce it on 13.1, but it should be the same with all FreeBSD versions .
How-To-Reproduce:
The attached C program written by Alain Thivillon <[email protected]> who
warn me about this bug can be used to reproduce the issue.
It makes a DNS query over tcp to 127.0.0.1:8888 .
Launch "nc -l 8888" in a shell and ./test in an other .
You will see a connection in the first shell and the test program will be
blocked on the DNS query in the second indefinitely or until you answer
something or close the nc.
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