4 * Copyright (c) 1980,1983,1988 Regents of the University of California.
7 * Redistribution and use in source and binary forms are permitted
8 * provided that this notice is preserved and that due credit is given
9 * to the University of California at Berkeley. The name of the University
10 * may not be used to endorse or promote products derived from this
11 * software without specific prior written permission. This software
12 * is provided ``as is'' without express or implied warranty.
18 * Structures returned by network
19 * data base library. All addresses
20 * are supplied in host order, and
21 * returned in network order (suitable
22 * for use in system calls).
25 char *h_name; /* official name of host */
26 char **h_aliases; /* alias list */
27 int h_addrtype; /* host address type */
28 int h_length; /* length of address */
29 char **h_addr_list; /* list of addresses from name server */
30 #define h_addr h_addr_list[0] /* address, for backward compatiblity */
34 * Assumption here is that a network number
35 * fits in 32 bits -- probably a poor one.
38 char *n_name; /* official name of net */
39 char **n_aliases; /* alias list */
40 int n_addrtype; /* net address type */
41 unsigned long n_net; /* network # */
45 char *s_name; /* official service name */
46 char **s_aliases; /* alias list */
47 int s_port; /* port # */
48 char *s_proto; /* protocol to use */
52 char *p_name; /* official protocol name */
53 char **p_aliases; /* alias list */
54 int p_proto; /* protocol # */
57 struct hostent *gethostbyname(), *gethostbyaddr(), *gethostent();
58 struct netent *getnetbyname(), *getnetbyaddr(), *getnetent();
59 struct servent *getservbyname(), *getservbyport(), *getservent();
60 struct protoent *getprotobyname(), *getprotobynumber(), *getprotoent();
63 * Error return codes from gethostbyname() and gethostbyaddr()
64 * (left in extern int h_errno).
67 #define HOST_NOT_FOUND 1 /* Authoritative Answer Host not found */
68 #define TRY_AGAIN 2 /* Non-Authoritive Host not found, or SERVERFAIL */
69 #define NO_RECOVERY 3 /* Non recoverable errors, FORMERR, REFUSED, NOTIMP */
70 #define NO_DATA 4 /* Valid name, no data record of requested type */
71 #define NO_ADDRESS NO_DATA /* no address, look for MX record */