1 #ifndef _RESOLV_STATIC_H
2 #define _RESOLV_STATIC_H
3 
4 #include <netdb.h>
5 
6 /* this structure contains all the variables that were declared
7  * 'static' in the original NetBSD resolver code.
8  *
9  * this caused vast amounts of crashes and memory corruptions
10  * when the resolver was being used by multiple threads.
11  *
12  * (note: the OpenBSD/FreeBSD resolver has similar 'issues')
13  */
14 
15 #define	MAXALIASES	35
16 #define	MAXADDRS	35
17 
18 typedef struct res_static {
19     char*           h_addr_ptrs[MAXADDRS + 1];
20     char*           host_aliases[MAXALIASES];
21     char            hostbuf[8*1024];
22     u_int32_t       host_addr[16 / sizeof(u_int32_t)];  /* IPv4 or IPv6 */
23     FILE*           hostf;
24     int             stayopen;
25     const char*     servent_ptr;
26     struct servent  servent;
27     struct hostent  host;
28 } *res_static;
29 
30 extern res_static __res_get_static(void);
31 
32 #endif /* _RESOLV_STATIC_H */
33