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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_GETIPNODE" "3" "Jun 30, 2000" "BIND9" ""
-.SH NAME
-lwres_getipnodebyname, lwres_getipnodebyaddr, lwres_freehostent \- lightweight resolver nodename / address translation API
-.SH SYNOPSIS
-\fB#include <lwres/netdb.h>
-.sp
-.na
-struct hostent *
-lwres_getipnodebyname(const char *name, int af, int flags, int *error_num);
-.ad
-.sp
-.na
-struct hostent *
-lwres_getipnodebyaddr(const void *src, size_t len, int af, int *error_num);
-.ad
-.sp
-.na
-void
-lwres_freehostent(struct hostent *he);
-.ad
-\fR.SH "DESCRIPTION"
-.PP
-These functions perform thread safe, protocol independent
-nodename-to-address and address-to-nodename 
-translation as defined in RFC2553.
-.PP
-They use a
-\fBstruct hostent\fR
-which is defined in
-\fInamedb.h\fR:
-.sp
-.nf
-struct  hostent {
-        char    *h_name;        /* official name of host */
-        char    **h_aliases;    /* alias list */
-        int     h_addrtype;     /* host address type */
-        int     h_length;       /* length of address */
-        char    **h_addr_list;  /* list of addresses from name server */
-};
-#define h_addr  h_addr_list[0]  /* address, for backward compatibility */
-.sp
-.fi
-.PP
-The members of this structure are:
-.TP
-\fBh_name\fR
-The official (canonical) name of the host.
-.TP
-\fBh_aliases\fR
-A NULL-terminated array of alternate names (nicknames) for the host.
-.TP
-\fBh_addrtype\fR
-The type of address being returned - usually
-\fBPF_INET\fR
-or
-\fBPF_INET6\fR.
-.TP
-\fBh_length\fR
-The length of the address in bytes.
-.TP
-\fBh_addr_list\fR
-A
-\fBNULL\fR
-terminated array of network addresses for the host.
-Host addresses are returned in network byte order.
-.PP
-\fBlwres_getipnodebyname()\fR
-looks up addresses of protocol family
-\fIaf\fR
-for the hostname
-\fIname\fR.
-The
-\fIflags\fR
-parameter contains ORed flag bits to 
-specify the types of addresses that are searched
-for, and the types of addresses that are returned. 
-The flag bits are:
-.TP
-\fBAI_V4MAPPED\fR
-This is used with an
-\fIaf\fR
-of AF_INET6, and causes IPv4 addresses to be returned as IPv4-mapped
-IPv6 addresses.
-.TP
-\fBAI_ALL\fR
-This is used with an
-\fIaf\fR
-of AF_INET6, and causes all known addresses (IPv6 and IPv4) to be returned.
-If AI_V4MAPPED is also set, the IPv4 addresses are return as mapped
-IPv6 addresses.
-.TP
-\fBAI_ADDRCONFIG\fR
-Only return an IPv6 or IPv4 address if here is an active network
-interface of that type. This is not currently implemented
-in the BIND 9 lightweight resolver, and the flag is ignored.
-.TP
-\fBAI_DEFAULT\fR
-This default sets the
-AI_V4MAPPED
-and
-AI_ADDRCONFIG
-flag bits.
-.PP
-\fBlwres_getipnodebyaddr()\fR
-performs a reverse lookup
-of address
-\fIsrc\fR
-which is
-\fIlen\fR
-bytes long.
-\fIaf\fR
-denotes the protocol family, typically
-\fBPF_INET\fR
-or
-\fBPF_INET6\fR.
-.PP
-\fBlwres_freehostent()\fR
-releases all the memory associated with
-the
-\fBstruct hostent\fR
-pointer
-\fIhe\fR.
-Any memory allocated for the
-h_name,
-h_addr_list
-and
-h_aliases
-is freed, as is the memory for the
-\fBhostent\fR
-structure itself.
-.SH "RETURN VALUES"
-.PP
-If an error occurs,
-\fBlwres_getipnodebyname()\fR
-and
-\fBlwres_getipnodebyaddr()\fR
-set
-\fI*error_num\fR
-to an approriate error code and the function returns a
-\fBNULL\fR
-pointer.
-The error codes and their meanings are defined in
-\fI<lwres/netdb.h>\fR:
-.TP
-\fBHOST_NOT_FOUND\fR
-No such host is known.
-.TP
-\fBNO_ADDRESS\fR
-The server recognised the request and the name but no address is
-available. Another type of request to the name server for the
-domain might return an answer.
-.TP
-\fBTRY_AGAIN\fR
-A temporary and possibly transient error occurred, such as a
-failure of a server to respond. The request may succeed if
-retried.
-.TP
-\fBNO_RECOVERY\fR
-An unexpected failure occurred, and retrying the request
-is pointless.
-.PP
-\fBlwres_hstrerror\fR(3)
-translates these error codes to suitable error messages.
-.SH "SEE ALSO"
-.PP
-\fBRFC2553\fR,
-\fBlwres\fR(3),
-\fBlwres_gethostent\fR(3),
-\fBlwres_getaddrinfo\fR(3),
-\fBlwres_getnameinfo\fR(3),
-\fBlwres_hstrerror\fR(3).