1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
|
#ifndef _RESOLV_H
#define _RESOLV_H
#include <sys/param.h>
#include <sys/types.h>
#include <stdio.h>
#include <netinet/in.h>
#ifndef _PATH_RESCONF
#define _PATH_RESCONF "/etc/resolv.conf"
#endif
/*
* Global defines and variables for resolver stub.
*/
#define MAXNS 8 /* max # name servers we'll track */
#define MAXDFLSRCH 3 /* # default domain levels to try */
#define MAXDNSRCH 6 /* max # domains in search path */
#define LOCALDOMAINPARTS 2 /* min levels in name that is "local" */
#define RES_TIMEOUT 5 /* min. seconds between retries */
#define MAXRESOLVSORT 10 /* number of net to sort on */
#define RES_MAXNDOTS 15 /* should reflect bit field size */
struct res_state {
int retrans; /* retransmission time interval */
int retry; /* number of times to retransmit */
unsigned long options; /* option flags - see below. */
int nscount; /* number of name servers */
struct sockaddr_in_pad
nsaddr_list[MAXNS]; /* address of name server */
#define nsaddr nsaddr_list[0] /* for backward compatibility */
unsigned short id; /* current message id */
char *dnsrch[MAXDNSRCH+1]; /* components of domain to search */
char defdname[256]; /* default domain (deprecated) */
unsigned long pfcode; /* RES_PRF_ flags - see below. */
unsigned ndots:4; /* threshold for initial abs. query */
unsigned nsort:4; /* number of elements in sort_list[] */
char unused[3];
struct {
struct in_addr addr;
uint32_t mask;
} sort_list[MAXRESOLVSORT];
char pad[72]; /* on an i386 this means 512b total */
};
/*
* Resolver options (keep these in synch with res_debug.c, please)
*/
#define RES_INIT 0x00000001 /* address initialized */
#define RES_DEBUG 0x00000002 /* print debug messages */
#define RES_AAONLY 0x00000004 /* authoritative answers only (!IMPL)*/
#define RES_USEVC 0x00000008 /* use virtual circuit */
#define RES_PRIMARY 0x00000010 /* query primary server only (!IMPL) */
#define RES_IGNTC 0x00000020 /* ignore trucation errors */
#define RES_RECURSE 0x00000040 /* recursion desired */
#define RES_DEFNAMES 0x00000080 /* use default domain name */
#define RES_STAYOPEN 0x00000100 /* Keep TCP socket open */
#define RES_DNSRCH 0x00000200 /* search up local domain tree */
#define RES_INSECURE1 0x00000400 /* type 1 security disabled */
#define RES_INSECURE2 0x00000800 /* type 2 security disabled */
#define RES_NOALIASES 0x00001000 /* shuts off HOSTALIASES feature */
#define RES_USE_INET6 0x00002000 /* use/map IPv6 in gethostbyname() */
#define RES_DEFAULT (RES_RECURSE | RES_DEFNAMES | RES_DNSRCH)
/*
* Resolver "pfcode" values. Used by dig.
*/
#define RES_PRF_STATS 0x00000001
/* 0x00000002 */
#define RES_PRF_CLASS 0x00000004
#define RES_PRF_CMD 0x00000008
#define RES_PRF_QUES 0x00000010
#define RES_PRF_ANS 0x00000020
#define RES_PRF_AUTH 0x00000040
#define RES_PRF_ADD 0x00000080
#define RES_PRF_HEAD1 0x00000100
#define RES_PRF_HEAD2 0x00000200
#define RES_PRF_TTLID 0x00000400
#define RES_PRF_HEADX 0x00000800
#define RES_PRF_QUERY 0x00001000
#define RES_PRF_REPLY 0x00002000
#define RES_PRF_INIT 0x00004000
/* 0x00008000 */
struct res_sym {
int number; /* Identifying number, like T_MX */
char * name; /* Its symbolic name, like "MX" */
char * humanname; /* Its fun name, like "mail exchanger" */
};
extern struct res_state _res;
extern const struct res_sym __p_class_syms[];
extern const struct res_sym __p_type_syms[];
int res_init(void) __THROW;
int res_query(const char *dname, int class, int type,
unsigned char *answer, int anslen) __THROW;
int res_search(const char *dname, int class, int type,
unsigned char *answer, int anslen) __THROW;
int res_querydomain(const char *name, const char *domain,
int class, int type, unsigned char *answer,
int anslen) __THROW;
int res_mkquery(int op, const char *dname, int class,
int type, char *data, int datalen, const unsigned char* newrr,
char *buf, int buflen) __THROW;
int res_send(const char *msg, int msglen, char *answer,
int anslen) __THROW;
int dn_comp(unsigned char *msg, unsigned char *comp_dn,
int length, unsigned char **dnptrs, unsigned char *exp_dn,
unsigned char **lastdnptr) __THROW;
int dn_expand(unsigned char *msg, unsigned char *eomorig,
unsigned char *comp_dn, unsigned char *exp_dn,
int length) __THROW;
#endif
|
