From mboxrd@z Thu Jan 1 00:00:00 1970
From: bugzilla-daemon-590EEB7GvNiWaY/ihj7yzEB+6BGkLq7r@public.gmane.org
Subject: [Bug 104561] New: Autobind in unix domain sockets always requires
call to bind
Date: Tue, 15 Sep 2015 07:45:12 +0000
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https://bugzilla.kernel.org/show_bug.cgi?id=104561
Bug ID: 104561
Summary: Autobind in unix domain sockets always requires call
to bind
Product: Documentation
Version: unspecified
Hardware: All
OS: Linux
Status: NEW
Severity: normal
Priority: P1
Component: man-pages
Assignee: documentation_man-pages-ztI5WcYan/vQLgFONoPN62D2FQJk+8+b@public.gmane.org
Reporter: a0vhv-zqRNUXuvxA0b1SvskN2V4Q@public.gmane.org
Regression: No
Created attachment 187571
--> https://bugzilla.kernel.org/attachment.cgi?id=187571&action=edit
Example code that shows bind() is necessary for autobind
In "man 7 unix" it says:
"If a bind(2) call specifies addrlen as sizeof(sa_family_t), or the SO_PASSCRED
socket option was specified for a socket that was not explicitly bound to an
address, then the socket is autobound to an abstract address."
However, only setting SO_PASSCRED is not enough to autobind. You always have to
call bind, as you can see in the attached example. If you run it, every call
should succeed and getsockname reports that the autobind address has a size of
8 bytes.
Now remove lines 20-22, so the socket gets no longer explicitly bound.
getsockname reports that the address size is 2 bytes (because
bound_addr.sun_path is not used) and the call to "listen" fails.
So it seems the call to "bind" is necessary even if SO_PASSCRED is used.
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