1#ifndef LOOKUP_H
2#define LOOKUP_H
3
4#include <stdint.h>
5#include <stddef.h>
6#include <features.h>
7#include <netinet/in.h>
8#include <netdb.h>
9
10struct aibuf {
11 struct addrinfo ai;
12 union sa {
13 struct sockaddr_in sin;
14 struct sockaddr_in6 sin6;
15 } sa;
16 volatile int lock[1];
17 short slot, ref;
18};
19
20struct address {
21 int family;
22 unsigned scopeid;
23 uint8_t addr[16];
24 int sortkey;
25};
26
27struct service {
28 uint16_t port;
29 unsigned char proto, socktype;
30};
31
32#define MAXNS 3
33
34struct resolvconf {
35 struct address ns[MAXNS];
36 unsigned nns, attempts, ndots;
37 unsigned timeout;
38};
39
40/* The limit of 48 results is a non-sharp bound on the number of addresses
41 * that can fit in one 512-byte DNS packet full of v4 results and a second
42 * packet full of v6 results. Due to headers, the actual limit is lower. */
43#define MAXADDRS 48
44#define MAXSERVS 2
45
46hidden int __lookup_serv(struct service buf[static MAXSERVS], const char *name, int proto, int socktype, int flags);
47hidden int __lookup_name(struct address buf[static MAXADDRS], char canon[static 256], const char *name, int family, int flags);
48hidden int __lookup_ipliteral(struct address buf[static 1], const char *name, int family);
49
50hidden int __get_resolv_conf(struct resolvconf *, char *, size_t);
51hidden int __res_msend_rc(int, const unsigned char *const *, const int *, unsigned char *const *, int *, int, const struct resolvconf *);
52
53hidden int __dns_parse(const unsigned char *, int, int (*)(void *, int, const void *, int, const void *, int), void *);
54
55#endif