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- Copyright (C) 2000, 2001, 2003-2005, 2007, 2014-2016, 2018-2020 Internet Systems Consortium, Inc. ("ISC")
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-
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- This Source Code Form is subject to the terms of the Mozilla Public
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- License, v. 2.0. If a copy of the MPL was not distributed with this
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- file, You can obtain one at http://mozilla.org/MPL/2.0/.
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-->
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<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
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<title>lwres_getipnode</title>
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<meta name="generator" content="DocBook XSL Stylesheets V1.78.1">
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<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF">
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Name
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lwres_getipnodebyname,
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lwres_getipnodebyaddr,
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lwres_freehostent
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— lightweight resolver nodename / address translation API
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Synopsis
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#include <lwres/netdb.h>
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struct hostent *
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lwres_getipnodebyname(
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const char *name,
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int af,
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int flags,
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int *error_num);
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struct hostent *
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lwres_getipnodebyaddr(
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const void *src,
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size_t len,
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int af,
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int *error_num);
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void
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lwres_freehostent(
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struct hostent *he);
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DESCRIPTION
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These functions perform thread safe, protocol independent
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nodename-to-address and address-to-nodename
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translation as defined in RFC2553.
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They use a
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struct hostent
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which is defined in
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namedb.h:
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struct hostent {
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char *h_name; /* official name of host */
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char **h_aliases; /* alias list */
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int h_addrtype; /* host address type */
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int h_length; /* length of address */
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char **h_addr_list; /* list of addresses from name server */
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};
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#define h_addr h_addr_list[0] /* address, for backward compatibility */
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The members of this structure are:
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h_name
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The official (canonical) name of the host.
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h_aliases
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A NULL-terminated array of alternate names (nicknames) for the
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host.
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h_addrtype
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The type of address being returned - usually
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PF_INET
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or
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PF_INET6.
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h_length
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The length of the address in bytes.
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h_addr_list
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A
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NULL
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terminated array of network addresses for the host.
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Host addresses are returned in network byte order.
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lwres_getipnodebyname()
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looks up addresses of protocol family af
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for the hostname name. The
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flags parameter contains ORed flag bits
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to specify the types of addresses that are searched for, and the
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types of addresses that are returned. The flag bits are:
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AI_V4MAPPED
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This is used with an
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af
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of AF_INET6, and causes IPv4 addresses to be returned as
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IPv4-mapped
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IPv6 addresses.
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AI_ALL
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This is used with an
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af
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of AF_INET6, and causes all known addresses (IPv6 and IPv4) to
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be returned.
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If AI_V4MAPPED is also set, the IPv4 addresses are return as
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mapped
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IPv6 addresses.
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AI_ADDRCONFIG
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Only return an IPv6 or IPv4 address if here is an active network
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interface of that type. This is not currently implemented
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in the BIND 9 lightweight resolver, and the flag is ignored.
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AI_DEFAULT
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This default sets the
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AI_V4MAPPED
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and
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AI_ADDRCONFIG
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flag bits.
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lwres_getipnodebyaddr()
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performs a reverse lookup of address src
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which is len bytes long.
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af denotes the protocol family, typically
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PF_INET or PF_INET6.
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lwres_freehostent()
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releases all the memory associated with the struct
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hostent pointer he. Any memory
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allocated for the h_name,
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h_addr_list and
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h_aliases is freed, as is the memory for
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the hostent structure itself.
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RETURN VALUES
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If an error occurs,
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lwres_getipnodebyname()
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and
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lwres_getipnodebyaddr()
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set
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*error_num
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to an appropriate error code and the function returns a
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NULL
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pointer.
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The error codes and their meanings are defined in
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<lwres/netdb.h>:
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HOST_NOT_FOUND
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No such host is known.
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NO_ADDRESS
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The server recognised the request and the name but no address is
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available. Another type of request to the name server for the
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domain might return an answer.
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TRY_AGAIN
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A temporary and possibly transient error occurred, such as a
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failure of a server to respond. The request may succeed if
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retried.
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NO_RECOVERY
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An unexpected failure occurred, and retrying the request
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is pointless.
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lwres_hstrerror(3)
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translates these error codes to suitable error messages.
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SEE ALSO
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RFC2553
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,
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lwres(3)
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,
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lwres_gethostent(3)
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,
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lwres_getaddrinfo(3)
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,
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lwres_getnameinfo(3)
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,
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lwres_hstrerror(3)
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.
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</body>
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</html>
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