Back out my previous commit to this area, there are differences between
our implementation and OpenBSD's. Requested by: des
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trhodes
parent
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commit
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@ -2,7 +2,6 @@
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LIB= ypclnt
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SHLIB_MAJOR= 2
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MAN= ypclnt.3
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SRCS= ypclnt_connect.c \
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ypclnt_error.c \
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ypclnt_free.c \
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@ -1,362 +0,0 @@
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.\" $OpenBSD: ypclnt.3,v 1.16 2003/07/07 15:46:37 jmc Exp $
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.\"
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.\" Copyright (c) 1996 The NetBSD Foundation, Inc.
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.\" All rights reserved.
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.\"
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.\" This code is derived from software contributed to The NetBSD Foundation
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.\" by Jason R. Thorpe.
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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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.\" 3. All advertising materials mentioning features or use of this software
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.\" must display the following acknowledgement:
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.\" This product includes software developed by the NetBSD
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.\" Foundation, Inc. and its contributors.
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.\" 4. Neither the name of The NetBSD Foundation nor the names of its
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.\" contributors may be used to endorse or promote products derived
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.\" from this software without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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.\" ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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.\" TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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.\" PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE
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.\" LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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.\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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.\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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.\" INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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.\" CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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.\" POSSIBILITY OF SUCH DAMAGE.
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.\"
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.\" $FreeBSD$
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.\"
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.Dd October 26, 1994
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.Dt YPCLNT 3
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.Os
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.Sh NAME
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.Nm yp_all ,
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.Nm yp_bind ,
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.Nm yp_first ,
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.Nm yp_get_default_domain ,
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.Nm yp_master ,
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.Nm yp_match ,
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.Nm yp_next ,
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.Nm yp_order ,
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.Nm yp_unbind ,
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.Nm yperr_string ,
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.Nm ypprot_err
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.Nd Interface to the YP subsystem
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.Sh SYNOPSIS
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.Fd #include <sys/types.h>
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.Fd #include <rpc/rpc.h>
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.Fd #include <rpcsvc/ypclnt.h>
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.Fd #include <rpcsvc/yp_prot.h>
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.Ft int
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.Fn yp_all "char *indomain" "char *inmap" "struct ypall_callback *incallback"
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.Ft int
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.Fn yp_bind "char *dom"
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.Ft int
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.Fn yp_first "char *indomain" "char *inmap" "char **outkey" "int *outkeylen" "char **outval" "int *outvallen"
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.Ft int
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.Fn yp_get_default_domain "char **domp"
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.Ft int
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.Fn yp_master "char *indomain" "char *inmap" "char **outname"
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.Ft int
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.Fn yp_match "char *indomain" "char *inmap" "const char *inkey" "int inkeylen" "char **outval" "int *outvallen"
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.Ft int
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.Fn yp_next "char *indomain" "char *inmap" "char *inkey" "int inkeylen" "char **outkey" "int *outkeylen" "char **outval" "int *outvallen"
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.Ft int
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.Fn yp_order "char *indomain" "char *inmap" "int *outorder"
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.Ft void
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.Fn yp_unbind "char *dom"
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.Ft const char *
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.Fn yperr_string "int incode"
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.Ft int
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.Fn ypprot_err "unsigned int incode"
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.Sh DESCRIPTION
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The
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.Nm ypclnt
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suite provides an interface to the YP subsystem.
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For a general description of the YP subsystem, see
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.Xr yp 8 .
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.Pp
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For all functions, input values begin with
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.Ar in
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and output values begin with
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.Ar out .
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Any output values of type
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.Ar char **
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should be the addresses of uninitialized character pointers.
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Memory will be allocated by the YP client routines using
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.Fn malloc .
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This memory can later be freed by the user if there is no additional need for
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the data stored there.
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For
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.Ar outkey
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and
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.Ar outval ,
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two extra bytes of memory are allocated for a
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.Ql \en
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and
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.Ql \e0 ,
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which are not
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reflected in the values of
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.Ar outkeylen
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or
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.Ar outvallen .
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All occurrences of
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.Ar indomain
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and
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.Ar inmap
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must be non-null, NUL-terminated strings.
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All input strings which also have
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a corresponding length parameter cannot be null unless the corresponding
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length value is zero.
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Such strings need not be NUL-terminated.
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.Pp
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All YP lookup calls (the functions
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.Fn yp_all ,
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.Fn yp_first ,
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.Fn yp_master ,
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.Fn yp_match ,
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.Fn yp_next ,
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and
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.Fn yp_order )
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require a YP domain name and a YP map name.
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The default domain name may be obtained by calling
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.Fn yp_get_default_domain ,
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and should thus be used before all other YP calls in a client program.
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The value it places
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.Ar outdomain
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is suitable for use as the
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.Ar indomain
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parameter to all subsequent YP calls.
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.Pp
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In order for YP lookup calls to succeed, the client process must be bound
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to a YP server process.
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The client process need not explicitly bind to the server, as it happens
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automatically whenever a lookup occurs.
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The function
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.Fn yp_bind
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is provided for a backup strategy, e.g., a local file, when a YP server process
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is not available.
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Each binding uses one socket descriptor on the client process, which may
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be explicitly freed using
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.Fn yp_unbind ,
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which frees all per-process and per-node resources to bind the domain and
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marks the domain unbound.
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.Pp
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If, during a YP lookup, an RPC failure occurs, the domain used in the lookup
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is automatically marked unbound and the
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.Nm ypclnt
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layer retries the lookup as long as
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.Xr ypbind 8
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is running and either the client process cannot bind to a server for the domain
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specified in the lookup, or RPC requests to the YP server process fail.
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If an error is not RPC-related, one of the YP error codes described below
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is returned and control given back to the user code.
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.Pp
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The
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.Nm ypclnt
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suite provides the following functionality:
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.Bl -tag -width "yperr_string()"
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.It Fn yp_match
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Provides the value associated with the given key.
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.It Fn yp_first
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Provides the first key-value pair from the given map in the named domain.
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.It Fn yp_next
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Provides the next key-value pair in the given map.
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To obtain the second pair, the
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.Pa inkey
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value should be the
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.Ar outkey
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value provided by the initial call to
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.Fn yp_first .
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In the general case, the next key-value pair may be obtained by using the
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.Ar outkey
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value from the previous call to
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.Fn yp_next
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as the value for
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.Ar inkey .
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.Pp
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Of course, the notions of
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.Dq first
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and
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.Dq next
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are particular to the
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type of YP map being accessed, and thus there is no guarantee of lexical
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order.
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The only guarantees provided with
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.Fn yp_first
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and
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.Fn yp_next ,
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providing that the same map on the same server is polled repeatedly
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until
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.Fn yp_next
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returns YPERR_NOMORE, are that all key-value pairs in that map will be accessed
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exactly once, and if the entire procedure is repeated, the order will be
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the same.
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.Pp
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If the server is heavily loaded or the server fails for some reason, the
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domain being used may become unbound.
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If this happens, and the client process
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re-binds, the retrieval rules will break: some entries may be seen twice, and
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others not at all.
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For this reason, the function
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.Fn yp_all
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provides a better solution for reading all of the entries in a particular
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map.
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.It Fn yp_all
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This function provides a way to transfer an entire map from
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the server to the client process with a single request.
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This transfer uses TCP, unlike all other functions in the
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.Nm ypclnt
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suite, which use UDP.
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The entire transaction occurs in a single RPC request-response.
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The third argument to this function provides a way to supply the name
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of a function to process each key-value pair in the map.
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.Fn yp_all
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returns after the entire transaction is complete, or the
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.Fn foreach
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function decides that it does not want any more key-value pairs.
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The third argument to
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.Fn yp_all
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is:
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.Bd -literal -offset indent
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struct ypall_callback *incallback {
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int (*foreach)();
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char *data;
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};
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.Ed
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.Pp
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The
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.Em char *data
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argument is an opaque pointer for use by the callback function.
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The
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.Fn foreach
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function should return non-zero when it no longer wishes to process
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key-value pairs, at which time
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.Fn yp_all
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returns a value of 0, and is called with the following arguments:
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.Bd -literal -offset indent
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int foreach (
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int instatus,
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char *inkey,
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int inkeylen,
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char *inval,
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int invallen,
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char *indata
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);
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.Ed
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.Pp
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Where:
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.Bl -tag -width "It Ar inkey, inval"
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.It Fa instatus
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Holds one of the return status values described in
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.Aq Pa rpcsvc/yp_prot.h :
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see
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.Fn ypprot_err
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below for a function that will translate YP protocol errors into a
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.Nm ypclnt
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layer error code as described in
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.Aq Pa rpcsvc/ypclnt.h .
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.It Ar inkey, inval
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The key and value arguments are somewhat different here than described
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above.
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In this case, the memory pointed to by
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.Ar inkey
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and
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.Ar inval
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is private to
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.Fn yp_all ,
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and is overwritten with each subsequent key-value pair; therefore, the
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.Fn foreach
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function should do something useful with the contents of that memory during
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each iteration.
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If the key-value pairs are not terminated with either
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.Ql \en
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or
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.Ql \e0
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in the map, then they will not be terminated as such when given to the
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.Fn foreach
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function, either.
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.It Ar indata
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This is the contents of the
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.Pa incallback->data
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element of the callback structure.
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It is provided as a means to share state between the
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.Fn foreach
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function and the user code.
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Its use is completely optional: cast it to something useful or simply
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ignore it.
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.El
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.It Fn yp_order
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Returns the order number for a map.
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.It Fn yp_master
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Returns the hostname for the machine on which the master YP server process for
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a map is running.
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.It Fn yperr_string
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Returns a pointer to a NUL-terminated error string that does not contain a
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.Ql \&.
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or
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.Ql \en .
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.It Fn ypprot_err
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Converts a YP protocol error code to a
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.Nm ypclnt
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error code suitable for
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.Fn yperr_string .
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.El
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.Sh RETURN VALUES
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All functions in the
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.Nm ypclnt
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suite which are of type
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.Em int
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return 0 upon success or one of the following error codes upon failure:
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.Bl -tag -width "YPERR_BADARGS "
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.It Bq Er YPERR_BADARGS
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The passed arguments to the function are invalid.
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.It Bq Er YPERR_BADDB
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The YP map that was polled is defective.
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.It Bq Er YPERR_DOMAIN
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Client process cannot bind to server on this YP domain.
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.It Bq Er YPERR_KEY
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The key passed does not exist.
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.It Bq Er YPERR_MAP
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There is no such map in the server's domain.
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.It Bq Er YPERR_DOM
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The local YP domain is not set.
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.It Bq Er YPERR_NOMORE
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There are no more records in the queried map.
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.It Bq Er YPERR_PMAP
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Cannot communicate with portmap.
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.It Bq Er YPERR_RESRC
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A resource allocation failure occurred.
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.It Bq Er YPERR_RPC
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An RPC failure has occurred.
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The domain has been marked unbound.
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.It Bq Er YPERR_VERS
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Client/server version mismatch.
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If the server is running version 1 of the YP protocol,
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.Fn yp_all
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functionality does not exist.
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.It Bq Er YPERR_BIND
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Cannot communicate with
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.Xr ypbind 8 .
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.It Bq Er YPERR_YPERR
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An internal server or client error has occurred.
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.It Bq Er YPERR_YPSERV
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The client cannot communicate with the YP server process.
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.El
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.Sh SEE ALSO
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.Xr malloc 3 ,
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.Xr yp 8 ,
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.Xr ypbind 8 ,
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.Xr ypserv 8
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.Sh AUTHORS
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Theo De Raadt
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