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fa9f742201
The argument 's' of getpeerid(3) must be a connected UNIX-domain socket, so document it. PR: 248614 MFC after: 3 days Differential Revision: https://reviews.freebsd.org/D42629
135 lines
3.3 KiB
Groff
135 lines
3.3 KiB
Groff
.\"
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.\" Copyright (c) 2001 Dima Dorfman.
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.\" All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.Dd November 16, 2023
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.Dt GETPEEREID 3
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.Os
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.Sh NAME
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.Nm getpeereid
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.Nd get the effective credentials of a UNIX-domain peer
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.Sh LIBRARY
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.Lb libc
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.Sh SYNOPSIS
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.In unistd.h
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.Ft int
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.Fn getpeereid "int s" "uid_t *euid" "gid_t *egid"
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.Sh DESCRIPTION
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The
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.Fn getpeereid
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function returns the effective user and group IDs of the
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peer connected to a
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.Ux Ns -domain
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socket.
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The argument
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.Fa s
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must be a connected
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.Ux Ns -domain
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socket
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.Pq Xr unix 4
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of type
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.Dv SOCK_STREAM
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on which either
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.Xr connect 2
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or
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.Xr listen 2
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has been called.
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The effective user ID is placed in
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.Fa euid ,
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and the effective group ID in
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.Fa egid .
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.Pp
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The credentials returned to the
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.Xr listen 2
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caller are those of its peer at the time it called
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.Xr connect 2 ;
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the credentials returned to the
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.Xr connect 2
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caller are those of its peer at the time it called
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.Xr listen 2 .
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This mechanism is reliable; there is no way for either side to influence
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the credentials returned to its peer except by calling the appropriate
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system call (i.e., either
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.Xr connect 2
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or
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.Xr listen 2 )
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under different effective credentials.
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.Pp
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One common use of this routine is for a
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.Ux Ns -domain
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server
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to verify the credentials of its client.
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Likewise, the client can verify the credentials of the server.
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.Sh IMPLEMENTATION NOTES
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On
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.Fx ,
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.Fn getpeereid
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is implemented in terms of the
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.Dv LOCAL_PEERCRED
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.Xr unix 4
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socket option.
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.Sh RETURN VALUES
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.Rv -std getpeereid
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.Sh ERRORS
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The
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.Fn getpeereid
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function
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fails if:
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.Bl -tag -width Er
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.It Bq Er EBADF
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The argument
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.Fa s
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is not a valid descriptor.
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.It Bq Er ENOTSOCK
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The argument
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.Fa s
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is a file, not a socket.
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.It Bq Er ENOTCONN
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The argument
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.Fa s
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does not refer to a socket on which
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.Xr connect 2
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or
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.Xr listen 2
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have been called.
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.It Bq Er EINVAL
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The argument
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.Fa s
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does not refer to a socket of type
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.Dv SOCK_STREAM ,
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or the kernel returned invalid data.
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.El
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.Sh SEE ALSO
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.Xr connect 2 ,
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.Xr getpeername 2 ,
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.Xr getsockname 2 ,
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.Xr getsockopt 2 ,
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.Xr listen 2 ,
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.Xr unix 4
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.Sh HISTORY
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The
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.Fn getpeereid
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function appeared in
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.Fx 4.6 .
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