Yeah I forgot to mention the LOCAL_CREDS.
It does not return the PID of the client process but i guess it could be
expanded to include that instead of adding another option for that.
On Sun, Jul 9, 2017 at 11:47 AM, Stefan Ehmann <shoes...@gmx.net> wrote:
> On 09.07.2017 10:03, Johannes Lundberg wrote:
>> Without altering the client code (i.e. adding sendmsg(credentials)), is
>> there anyway of getting the client PID (or path to binary) using the file
>> descriptor returned by accept() on the server side?
>> Similar to Linux's getsockopt with SO_PEERCRED option.
> You want the LOCAL_CREDS socket option from unix(4).
> There's also a FreeBSD sample in the UNIX network programming book. Source
> is available from http://unpbook.com/src.html
> With the following two changes it seems to work for me:
> unixstrserv02.c: set LOCAL_CREDS
> readcred.c: disable CONTROL_LEN check
> $ ./unixstrserv02
> PID of sender = 1001
> real user ID = 1001
> real group ID = 1001
> effective user ID = 1001
> 3 groups: 0 5 920
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