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-.\" Copyright (C) 2004, 2005, 2007 Internet Systems Consortium, Inc. ("ISC")
-.\" Copyright (C) 2000, 2001 Internet Software Consortium.
-.\" 
-.\" Permission to use, copy, modify, and distribute this software for any
-.\" purpose with or without fee is hereby granted, provided that the above
-.\" copyright notice and this permission notice appear in all copies.
-.\" 
-.\" THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
-.\" REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
-.\" AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
-.\" INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
-.\" LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
-.\" OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
-.\" PERFORMANCE OF THIS SOFTWARE.
-.\"
-.\" $Id: lwres_resutil.3,v 1.17.18.11 2007/01/30 00:23:45 marka Exp $
-.\"
-.hy 0
-.ad l
-.\"     Title: lwres_resutil
-.\"    Author: 
-.\" Generator: DocBook XSL Stylesheets v1.71.1 <http://docbook.sf.net/>
-.\"      Date: Jun 30, 2000
-.\"    Manual: BIND9
-.\"    Source: BIND9
-.\"
-.TH "LWRES_RESUTIL" "3" "Jun 30, 2000" "BIND9" "BIND9"
-.\" disable hyphenation
-.nh
-.\" disable justification (adjust text to left margin only)
-.ad l
-.SH "NAME"
-lwres_string_parse, lwres_addr_parse, lwres_getaddrsbyname, lwres_getnamebyaddr \- lightweight resolver utility functions
-.SH "SYNOPSIS"
-.nf
-#include <lwres/lwres.h>
-.fi
-.HP 34
-.BI "lwres_result_t lwres_string_parse(lwres_buffer_t\ *" "b" ", char\ **" "c" ", lwres_uint16_t\ *" "len" ");"
-.HP 32
-.BI "lwres_result_t lwres_addr_parse(lwres_buffer_t\ *" "b" ", lwres_addr_t\ *" "addr" ");"
-.HP 36
-.BI "lwres_result_t lwres_getaddrsbyname(lwres_context_t\ *" "ctx" ", const\ char\ *" "name" ", lwres_uint32_t\ " "addrtypes" ", lwres_gabnresponse_t\ **" "structp" ");"
-.HP 35
-.BI "lwres_result_t lwres_getnamebyaddr(lwres_context_t\ *" "ctx" ", lwres_uint32_t\ " "addrtype" ", lwres_uint16_t\ " "addrlen" ", const\ unsigned\ char\ *" "addr" ", lwres_gnbaresponse_t\ **" "structp" ");"
-.SH "DESCRIPTION"
-.PP
-\fBlwres_string_parse()\fR
-retrieves a DNS\-encoded string starting the current pointer of lightweight resolver buffer
-\fIb\fR: i.e.
-\fBb\->current\fR. When the function returns, the address of the first byte of the encoded string is returned via
-\fI*c\fR
-and the length of that string is given by
-\fI*len\fR. The buffer's current pointer is advanced to point at the character following the string length, the encoded string, and the trailing
-\fBNULL\fR
-character.
-.PP
-\fBlwres_addr_parse()\fR
-extracts an address from the buffer
-\fIb\fR. The buffer's current pointer
-\fBb\->current\fR
-is presumed to point at an encoded address: the address preceded by a 32\-bit protocol family identifier and a 16\-bit length field. The encoded address is copied to
-\fBaddr\->address\fR
-and
-\fBaddr\->length\fR
-indicates the size in bytes of the address that was copied.
-\fBb\->current\fR
-is advanced to point at the next byte of available data in the buffer following the encoded address.
-.PP
-\fBlwres_getaddrsbyname()\fR
-and
-\fBlwres_getnamebyaddr()\fR
-use the
-\fBlwres_gnbaresponse_t\fR
-structure defined below:
-.PP
-.RS 4
-.nf
-typedef struct {
-        lwres_uint32_t          flags;
-        lwres_uint16_t          naliases;
-        lwres_uint16_t          naddrs;
-        char                   *realname;
-        char                  **aliases;
-        lwres_uint16_t          realnamelen;
-        lwres_uint16_t         *aliaslen;
-        lwres_addrlist_t        addrs;
-        void                   *base;
-        size_t                  baselen;
-} lwres_gabnresponse_t;
-.fi
-.RE
-.PP
-The contents of this structure are not manipulated directly but they are controlled through the
-\fBlwres_gabn\fR(3)
-functions.
-.PP
-The lightweight resolver uses
-\fBlwres_getaddrsbyname()\fR
-to perform foward lookups. Hostname
-\fIname\fR
-is looked up using the resolver context
-\fIctx\fR
-for memory allocation.
-\fIaddrtypes\fR
-is a bitmask indicating which type of addresses are to be looked up. Current values for this bitmask are
-\fBLWRES_ADDRTYPE_V4\fR
-for IPv4 addresses and
-\fBLWRES_ADDRTYPE_V6\fR
-for IPv6 addresses. Results of the lookup are returned in
-\fI*structp\fR.
-.PP
-\fBlwres_getnamebyaddr()\fR
-performs reverse lookups. Resolver context
-\fIctx\fR
-is used for memory allocation. The address type is indicated by
-\fIaddrtype\fR:
-\fBLWRES_ADDRTYPE_V4\fR
-or
-\fBLWRES_ADDRTYPE_V6\fR. The address to be looked up is given by
-\fIaddr\fR
-and its length is
-\fIaddrlen\fR
-bytes. The result of the function call is made available through
-\fI*structp\fR.
-.SH "RETURN VALUES"
-.PP
-Successful calls to
-\fBlwres_string_parse()\fR
-and
-\fBlwres_addr_parse()\fR
-return
-\fBLWRES_R_SUCCESS.\fR
-Both functions return
-\fBLWRES_R_FAILURE\fR
-if the buffer is corrupt or
-\fBLWRES_R_UNEXPECTEDEND\fR
-if the buffer has less space than expected for the components of the encoded string or address.
-.PP
-\fBlwres_getaddrsbyname()\fR
-returns
-\fBLWRES_R_SUCCESS\fR
-on success and it returns
-\fBLWRES_R_NOTFOUND\fR
-if the hostname
-\fIname\fR
-could not be found.
-.PP
-\fBLWRES_R_SUCCESS\fR
-is returned by a successful call to
-\fBlwres_getnamebyaddr()\fR.
-.PP
-Both
-\fBlwres_getaddrsbyname()\fR
-and
-\fBlwres_getnamebyaddr()\fR
-return
-\fBLWRES_R_NOMEMORY\fR
-when memory allocation requests fail and
-\fBLWRES_R_UNEXPECTEDEND\fR
-if the buffers used for sending queries and receiving replies are too small.
-.SH "SEE ALSO"
-.PP
-\fBlwres_buffer\fR(3),
-\fBlwres_gabn\fR(3).
-.SH "COPYRIGHT"
-Copyright \(co 2004, 2005, 2007 Internet Systems Consortium, Inc. ("ISC")
-.br
-Copyright \(co 2000, 2001 Internet Software Consortium.
-.br