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-.\"
-.\" 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 INTERNET SOFTWARE CONSORTIUM
-.\" DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL
-.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL
-.\" INTERNET SOFTWARE CONSORTIUM 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.
-.\"
-.TH "LWRES_RESUTIL" "3" "Jun 30, 2000" "BIND9" ""
-.SH NAME
-lwres_string_parse, lwres_addr_parse, lwres_getaddrsbyname, lwres_getnamebyaddr \- lightweight resolver utility functions
-.SH SYNOPSIS
-\fB#include <lwres/lwres.h>
-.sp
-.na
-lwres_result_t
-lwres_string_parse(lwres_buffer_t *b, char **c, lwres_uint16_t *len);
-.ad
-.sp
-.na
-lwres_result_t
-lwres_addr_parse(lwres_buffer_t *b, lwres_addr_t *addr);
-.ad
-.sp
-.na
-lwres_result_t
-lwres_getaddrsbyname(lwres_context_t *ctx, const char *name, lwres_uint32_t addrtypes, lwres_gabnresponse_t **structp);
-.ad
-.sp
-.na
-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);
-.ad
-\fR.SH "DESCRIPTION"
-.PP
-\fBlwres_string_parse()\fR retrieves a DNS-encoded
-string starting the current pointer of lightweight resolver buffer
-\fIb\fR: i.e. b->current.
-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
-b->current 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
-addr->address and
-addr->length indicates the size in bytes of
-the address that was copied. b->current 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:
-.sp
-.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;
-.sp
-.fi
-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
-LWRES_R_SUCCESS.
-Both functions return
-LWRES_R_FAILURE
-if the buffer is corrupt or
-LWRES_R_UNEXPECTEDEND
-if the buffer has less space than expected for the components of the
-encoded string or address.
-.PP
-\fBlwres_getaddrsbyname()\fR
-returns
-LWRES_R_SUCCESS
-on success and it returns
-LWRES_R_NOTFOUND
-if the hostname
-\fIname\fR
-could not be found.
-.PP
-LWRES_R_SUCCESS
-is returned by a successful call to
-\fBlwres_getnamebyaddr()\fR.
-.PP
-Both
-\fBlwres_getaddrsbyname()\fR
-and
-\fBlwres_getnamebyaddr()\fR
-return
-LWRES_R_NOMEMORY
-when memory allocation requests fail and
-LWRES_R_UNEXPECTEDEND
-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).