53 lines
1.7 KiB
Plaintext
53 lines
1.7 KiB
Plaintext
To: austin-review-l__AT__opengroup.org
|
|
From: nico-posix__AT__schottelius.org
|
|
Subject: Bug in TC2-d6 bind - bind a name to a socket
|
|
Reply-To: austin-group-l__AT__opengroup.org
|
|
|
|
Bug report from : Nico Schottelius , cLinux
|
|
|
|
(Note that the reply-to line automatically redirects
|
|
to austin-group-l__AT__opengroup.org for further discussion on bug reports)
|
|
|
|
@ page 1 line 0 section bind - bind a name to a socket objection {-1}
|
|
|
|
Problem:
|
|
|
|
bind should 'assign a name to a socket', but in particular environments it will fail, where it could succeed.
|
|
|
|
Long Description:
|
|
|
|
When opening a new socket, with type PF_UNIX
|
|
(sock = socket(PF_UNIX,SOCK_STREAM,0);) and one sets
|
|
the socket option SO_REUSEADDR
|
|
(setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, &tmp, sizeof(tmp))),
|
|
bind does not honour this setting.
|
|
|
|
It is reported on irc channels, that SO_REUSEADDR is only supported on
|
|
PF_INET sockets and that's what I would claim a bug.
|
|
|
|
If a socket exists in the filesystem and no process is bound to
|
|
it, bind wail fail anyway.
|
|
|
|
This is especially problematic, when one is in an environment,
|
|
which is pre-startup (like beeing init) and one wants to use
|
|
sockets, but everything is mounted read-only.
|
|
|
|
So, if bind() would honour the option, it would be able
|
|
to bind() to a socket, which exists (as creating one on a
|
|
read-only filesystem is not possible).
|
|
|
|
|
|
|
|
Action:
|
|
|
|
Proposal:
|
|
|
|
Add better specification to either socket(7) or bind(2), which
|
|
explains the behaviour of bind, when this option is set
|
|
or even better: Specify, that bind should take care of this bit,
|
|
also when using PF_UNIX.
|
|
|
|
In general the socket(7) manpage should explain more in detail
|
|
or at least reference other documents (unix(7)?), which explain what the
|
|
option for a specific protocol does.
|