.\" Copyright 1989 AT&T
.\" Copyright (c) 1988 Sun Microsystems, Inc. - All Rights Reserved.
.\"	$NetBSD: rpc_svc_reg.3,v 1.1 2000/06/02 23:11:14 fvdl Exp $
.Dd May 3, 1993
.Dt RPC_SVC_REG 3
.Os
.Sh NAME
.Nm rpc_svc_reg ,
.Nm rpc_reg ,
.Nm svc_reg ,
.Nm svc_unreg ,
.Nm svc_auth_reg ,
.Nm xprt_register ,
.Nm xprt_unregister
.Nd library routines for registering servers
.Sh LIBRARY
.Lb libc
.Sh SYNOPSIS
.In rpc/rpc.h
.Ft int
.Fn rpc_reg "rpcprog_t prognum" "rpcvers_t versnum" "rpcproc_t procnum" "char *(*procname)()" "xdrproc_t inproc" "xdrproc_t outproc" "char *nettype"
.Ft bool_t
.Fn svc_reg "SVCXPRT *xprt" "const rpcprog_t prognum" "const rpcvers_t versnum" "void (*dispatch)(struct svc_req *, SVCXPRT *)" "const struct netconfig *netconf"
.Ft void
.Fn svc_unreg "const rpcprog_t prognum" "const rpcvers_t versnum"
.Ft int
.Fn svc_auth_reg "int cred_flavor" "enum auth_stat (*handler)(struct svc_req *, struct rpc_msg *)"
.Ft void
.Fn xprt_register "SVCXPRT *xprt"
.Ft void
.Fn xprt_unregister "SVCXPRT *xprt"
.Sh DESCRIPTION
These routines are a part of the RPC
library which allows the RPC
servers to register themselves with rpcbind
(see
.Xr rpcbind 8 ) ,
and associate the given program and version
number with the dispatch function.
When the RPC server receives a RPC request, the library invokes the
dispatch routine with the appropriate arguments.
.Sh Routines
See
.Xr rpc 3
for the definition of the
.Vt SVCXPRT
data structure.
.Bl -tag -width XXXXX
.It Fn rpc_reg
Register program
.Fa prognum ,
procedure
.Fa procname ,
and version
.Fa versnum
with the RPC
service package.
If a request arrives for program
.Fa prognum ,
version
.Fa versnum ,
and procedure
.Fa procnum ,
.Fa procname
is called with a pointer to its argument(s);
.Fa procname
should return a pointer to its static result(s);
.Fa inproc
is the XDR function used to decode the arguments while
.Fa outproc
is the XDR function used to encode the results.
Procedures are registered on all available transports of the class
.Fa nettype .
See
.Xr rpc 3 .
This routine returns 0 if the registration succeeded,
\-1 otherwise.
.It Fn svc_reg
Associates
.Fa prognum
and
.Fa versnum
with the service dispatch procedure,
.Fa dispatch .
If
.Fa netconf
is
.Dv NULL ,
the service is not registered with the
.Xr rpcbind 8
service.
If
.Fa netconf
is non-zero,
then a mapping of the triple
.Bq Fa prognum , versnum , netconf->nc_netid
to
.Fa xprt->xp_ltaddr
is established with the local rpcbind
service.
.Pp
The
.Fn svc_reg
routine returns 1 if it succeeds,
and 0 otherwise.
.It Fn svc_unreg
Remove from the rpcbind
service, all mappings of the triple
.Bq Fa prognum , versnum , No all-transports
to network address
and all mappings within the RPC service package
of the double
.Bq Fa prognum , versnum
to dispatch routines.
.It Fn svc_auth_reg
Registers the service authentication routine
.Fa handler
with the dispatch mechanism so that it can be
invoked to authenticate RPC requests received
with authentication type
.Fa cred_flavor .
This interface allows developers to add new authentication
types to their RPC applications without needing to modify
the libraries.
Service implementors usually do not need this routine.
.Pp
Typical service application would call
.Fn svc_auth_reg
after registering the service and prior to calling
.Fn svc_run .
When needed to process an RPC credential of type
.Fa cred_flavor ,
the
.Fa handler
procedure will be called with two arguments,
.Fa "struct svc_req *rqst"
and
.Fa "struct rpc_msg *msg" ,
and is expected to return a valid
.Vt "enum auth_stat"
value.
There is no provision to change or delete an authentication handler
once registered.
.Pp
The
.Fn svc_auth_reg
routine returns 0 if the registration is successful,
1 if
.Fa cred_flavor
already has an authentication handler registered for it,
and \-1 otherwise.
.It Fn xprt_register
After RPC service transport handle
.Fa xprt
is created, it is registered with the RPC
service package.
This routine modifies the global variable
.Va svc_fdset
(see
.Xr rpc_svc_calls 3 ) .
Service implementors usually do not need this routine.
.It Fn xprt_unregister
Before an RPC service transport handle
.Fa xprt
is destroyed, it unregisters itself with the
RPC service package.
This routine modifies the global variable
.Va svc_fdset
(see
.Xr rpc_svc_calls 3 ) .
Service implementors usually do not need this routine.
.El
.Sh SEE ALSO
.Xr select 2 ,
.Xr rpc 3 ,
.Xr rpc_svc_calls 3 ,
.Xr rpc_svc_create 3 ,
.Xr rpc_svc_err 3 ,
.Xr rpcbind 3 ,
.Xr rpcbind 8