nbdkit_peer_name(3) NBDKIT nbdkit_peer_name(3) NAME nbdkit_peer_name, nbdkit_peer_pid, nbdkit_peer_uid, nbdkit_peer_gid, nbd- kit_peer_security_context - get client address and information for nbdkit SYNOPSIS #include <nbdkit-plugin.h> int nbdkit_peer_name (struct sockaddr *addr, socklen_t *addrlen); int64_t nbdkit_peer_pid (void); int64_t nbdkit_peer_uid (void); int64_t nbdkit_peer_gid (void); char *nbdkit_peer_security_context (void); DESCRIPTION nbdkit_peer_name Return the peer (client) address, if available. The "addr" and "addrlen" parameters behave like getpeername(2). In particular you must initialize "addrlen" with the size of the buffer pointed to by "addr", and if "addr" is not large enough then the address will be truncated. In some cases this is not available or the address returned will be mean- ingless (eg. if there is a proxy between the client and nbdkit). This call uses thread-local magic so no parameter is required to specify the current connection. nbdkit_peer_pid (nbdkit aY 1.24, Linux only) Return the peer process ID. This is only available when the client con- nected over a Unix domain socket. nbdkit_peer_uid (nbdkit aY 1.24) Return the peer user ID. This is only available when the client connected over a Unix domain socket. nbdkit_peer_gid (nbdkit aY 1.24) Return the peer group ID. This is only available when the client connected over a Unix domain socket. nbdkit_peer_security_context (nbdkit aY 1.36, not Windows) Return the peer security context (usually the SELinux label, IPSEC label or NetLabel). See the description of "SO_PEERSEC" in unix(7) and ip(7). RETURN VALUE All functions except "nbdkit_peer_security_context" return 0 on success. If there is an error they call nbdkit_error(3) and return -1. "nbdkit_peer_security_context" returns a security context as a string on success. The caller must free this string. On error (which can include missing label or unsupported protocol), nbdkit_error(3) is called and this call returns "NULL". LANGUAGE BINDINGS In nbdkit-ocaml-plugin(3): NBDKit.peer_name : unit -> Unix.sockaddr NBDKit.peer_pid : unit -> int64 NBDKit.peer_uid : unit -> int64 NBDKit.peer_gid : unit -> int64 NBDKit.peer_security_context : unit -> string In nbdkit-python-plugin(3): import nbdkit pid = nbdkit.peer_pid() uid = nbdkit.peer_uid() gid = nbdkit.peer_gid() security_context = nbdkit.peer_security_context() In nbdkit-rust-plugin(3): use nbdkit::*; pub fn peername<T: SockaddrLike>() -> std::result::Result<T, Box<dyn error::Error>> HISTORY "nbdkit_peer_name" was added in nbdkit 1.16. "nbdkit_peer_pid", "nbdkit_peer_uid" and "nbdkit_peer_gid" were added in nbdkit 1.24. "nbdkit_peer_security_context" was added in nbdkit 1.36. SEE ALSO nbdkit(1), nbdkit-plugin(3), nbdkit-filter(3), nbdkit-ip-filter(1), get- peername(2), unix(7), ip(7). AUTHORS Richard W.M. Jones COPYRIGHT Copyright Red Hat LICENSE Redistribution and use in source and binary forms, with or without modifi- cation, are permitted provided that the following conditions are met: * Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer. * Redistributions in binary form must reproduce the above copyright no- tice, this list of conditions and the following disclaimer in the docu- mentation and/or other materials provided with the distribution. * Neither the name of Red Hat nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission. THIS SOFTWARE IS PROVIDED BY RED HAT AND CONTRIBUTORS ''AS IS'' AND ANY EX- PRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DIS- CLAIMED. IN NO EVENT SHALL RED HAT OR CONTRIBUTORS BE LIABLE FOR ANY DI- RECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SER- VICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABIL- ITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAM- AGE. nbdkit-1.46.2 2026-08-30 nbdkit_peer_name(3)
NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | LANGUAGE BINDINGS | HISTORY | SEE ALSO | AUTHORS | COPYRIGHT | LICENSE
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