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- #ifndef _NETDB_H_
- #define _NETDB_H_
-
- /*
- * Structures returned by network data base library. All addresses are
- * supplied in host order, and returned in network order (suitable for
- * use in system calls).
- */
- struct hostent {
- char *h_name; /* official name of host */
- char **h_aliases; /* alias list */
- long h_addrtype; /* host address type */
- long 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 compatiblity */
- };
-
- /*
- * Assumption here is that a network number
- * fits in an unsigned long -- probably a poor one.
- */
- struct netent {
- char *n_name; /* official name of net */
- char **n_aliases; /* alias list */
- long n_addrtype; /* net address type */
- unsigned long n_net; /* network # */
- };
-
- struct servent {
- char *s_name; /* official service name */
- char **s_aliases; /* alias list */
- long s_port; /* port # */
- char *s_proto; /* protocol to use */
- };
-
- struct protoent {
- char *p_name; /* official protocol name */
- char **p_aliases; /* alias list */
- long p_proto; /* protocol # */
- };
-
- /*
- * Error return codes from gethostbyname() and gethostbyaddr()
- */
-
- #define HOST_NOT_FOUND 1 /* Authoritative Answer Host not found */
- #define TRY_AGAIN 2 /* Non-Authoritive Host not found, or SERVERFAIL */
- #define NO_RECOVERY 3 /* Non recoverable errors, FORMERR, REFUSED, NOTIMP */
- #define NO_DATA 4 /* Valid name, no data record of requested type */
- #define NO_ADDRESS NO_DATA /* no address, look for MX record */
-
- struct addrinfo {
- long ai_flags; /* AI_PASSIVE, AI_CANONNAME */
- long ai_family; /* PF_xxx */
- long ai_socktype; /* SOCK_xxx */
- long ai_protocol; /* IPPROTO_xxx for IPv4 and IPv6 */
- size_t ai_addrlen; /* length of ai_addr */
- char *ai_canonname; /* canonical name for host */
- struct sockaddr *ai_addr; /* binary address */
- struct addrinfo *ai_next; /* next structure in linked list */
- };
-
- /* following for getaddrinfo() */
- #define AI_PASSIVE 1 /* socket is intended for bind() + listen() */
- #define AI_CANONNAME 2 /* return canonical name */
-
- /* following for getnameinfo() */
- #define NI_MAXHOST 1025 /* max hostname returned */
- #define NI_MAXSERV 32 /* max service name returned */
-
- #define NI_NOFQDN 1 /* do not return FQDN */
- #define NI_NUMERICHOST 2 /* return numeric form of hostname */
- #define NI_NAMEREQD 4 /* return error if hostname not found */
- #define NI_NUMERICSERV 8 /* return numeric form of service name */
- #define NI_DGRAM 16 /* datagram service for getservbyname() */
-
- /* error returns */
- #define EAI_ADDRFAMILY 1 /* address family for host not supported */
- #define EAI_AGAIN 2 /* temporary failure in name resolution */
- #define EAI_BADFLAGS 3 /* invalid value for ai_flags */
- #define EAI_FAIL 4 /* non-recoverable failure in name resolution */
- #define EAI_FAMILY 5 /* ai_family not supported */
- #define EAI_MEMORY 6 /* memory allocation failure */
- #define EAI_NODATA 7 /* no address associated with host */
- #define EAI_NONAME 8 /* host nor service provided, or not known */
- #define EAI_SERVICE 9 /* service not supported for ai_socktype */
- #define EAI_SOCKTYPE 10 /* ai_socktype not supported */
- #define EAI_SYSTEM 11 /* system error returned in errno */
-
- #endif /* !_NETDB_H_ */
-