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16 .\" $Id: lwres_getipnode.3,v 1.13.2.3 2004/03/15 04:45:02 marka Exp $
18 .TH "LWRES_GETIPNODE" "3" "Jun 30, 2000" "BIND9" ""
20 lwres_getipnodebyname, lwres_getipnodebyaddr, lwres_freehostent \- lightweight resolver nodename / address translation API
22 \fB#include <lwres/netdb.h>
26 lwres_getipnodebyname(const char *name, int af, int flags, int *error_num);
31 lwres_getipnodebyaddr(const void *src, size_t len, int af, int *error_num);
36 lwres_freehostent(struct hostent *he);
41 These functions perform thread safe, protocol independent
42 nodename-to-address and address-to-nodename
43 translation as defined in RFC2553.
52 char *h_name; /* official name of host */
53 char **h_aliases; /* alias list */
54 int h_addrtype; /* host address type */
55 int h_length; /* length of address */
56 char **h_addr_list; /* list of addresses from name server */
58 #define h_addr h_addr_list[0] /* address, for backward compatibility */
62 The members of this structure are:
65 The official (canonical) name of the host.
68 A NULL-terminated array of alternate names (nicknames) for the host.
71 The type of address being returned - usually
77 The length of the address in bytes.
82 terminated array of network addresses for the host.
83 Host addresses are returned in network byte order.
85 \fBlwres_getipnodebyname()\fR
86 looks up addresses of protocol family
92 parameter contains ORed flag bits to
93 specify the types of addresses that are searched
94 for, and the types of addresses that are returned.
100 of AF_INET6, and causes IPv4 addresses to be returned as IPv4-mapped
106 of AF_INET6, and causes all known addresses (IPv6 and IPv4) to be returned.
107 If AI_V4MAPPED is also set, the IPv4 addresses are return as mapped
111 Only return an IPv6 or IPv4 address if here is an active network
112 interface of that type. This is not currently implemented
113 in the BIND 9 lightweight resolver, and the flag is ignored.
116 This default sets the
122 \fBlwres_getipnodebyaddr()\fR
123 performs a reverse lookup
130 denotes the protocol family, typically
135 \fBlwres_freehostent()\fR
136 releases all the memory associated with
141 Any memory allocated for the
146 is freed, as is the memory for the
152 \fBlwres_getipnodebyname()\fR
154 \fBlwres_getipnodebyaddr()\fR
157 to an appropriate error code and the function returns a
160 The error codes and their meanings are defined in
161 \fI<lwres/netdb.h>\fR:
164 No such host is known.
167 The server recognised the request and the name but no address is
168 available. Another type of request to the name server for the
169 domain might return an answer.
172 A temporary and possibly transient error occurred, such as a
173 failure of a server to respond. The request may succeed if
177 An unexpected failure occurred, and retrying the request
180 \fBlwres_hstrerror\fR(3)
181 translates these error codes to suitable error messages.
186 \fBlwres_gethostent\fR(3),
187 \fBlwres_getaddrinfo\fR(3),
188 \fBlwres_getnameinfo\fR(3),
189 \fBlwres_hstrerror\fR(3).