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ngx_resolver.h
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1 
2 /*
3  * Copyright (C) Igor Sysoev
4  * Copyright (C) Nginx, Inc.
5  */
6 
7 
8 #include <ngx_config.h>
9 #include <ngx_core.h>
10 
11 
12 #ifndef _NGX_RESOLVER_H_INCLUDED_
13 #define _NGX_RESOLVER_H_INCLUDED_
14 
15 
16 #define NGX_RESOLVE_A 1
17 #define NGX_RESOLVE_CNAME 5
18 #define NGX_RESOLVE_PTR 12
19 #define NGX_RESOLVE_MX 15
20 #define NGX_RESOLVE_TXT 16
21 #define NGX_RESOLVE_DNAME 39
22 
23 #define NGX_RESOLVE_FORMERR 1
24 #define NGX_RESOLVE_SERVFAIL 2
25 #define NGX_RESOLVE_NXDOMAIN 3
26 #define NGX_RESOLVE_NOTIMP 4
27 #define NGX_RESOLVE_REFUSED 5
28 #define NGX_RESOLVE_TIMEDOUT NGX_ETIMEDOUT
29 
30 
31 #define NGX_NO_RESOLVER (void *) -1
32 
33 #define NGX_RESOLVER_MAX_RECURSION 50
34 
35 
36 typedef struct {
37  ngx_connection_t *connection;
38  struct sockaddr *sockaddr;
39  socklen_t socklen;
40  ngx_str_t server;
41  ngx_log_t log;
42 } ngx_udp_connection_t;
43 
44 
45 typedef struct ngx_resolver_ctx_s ngx_resolver_ctx_t;
46 
47 typedef void (*ngx_resolver_handler_pt)(ngx_resolver_ctx_t *ctx);
48 
49 
50 typedef struct {
51  ngx_rbtree_node_t node;
52  ngx_queue_t queue;
53 
54  /* PTR: resolved name, A: name to resolve */
55  u_char *name;
56 
57  u_short nlen;
58  u_short qlen;
59 
60  u_char *query;
61 
62  union {
63  in_addr_t addr;
64  in_addr_t *addrs;
65  u_char *cname;
66  } u;
67 
68  u_short naddrs;
69  u_short cnlen;
70 
71  time_t expire;
72  time_t valid;
73 
74  ngx_resolver_ctx_t *waiting;
75 } ngx_resolver_node_t;
76 
77 
78 typedef struct {
79  /* has to be pointer because of "incomplete type" */
80  ngx_event_t *event;
81  void *dummy;
82  ngx_log_t *log;
83 
84  /* ident must be after 3 pointers */
85  ngx_int_t ident;
86 
87  /* simple round robin DNS peers balancer */
88  ngx_array_t udp_connections;
89  ngx_uint_t last_connection;
90 
91  ngx_rbtree_t name_rbtree;
92  ngx_rbtree_node_t name_sentinel;
93 
94  ngx_rbtree_t addr_rbtree;
95  ngx_rbtree_node_t addr_sentinel;
96 
97  ngx_queue_t name_resend_queue;
98  ngx_queue_t addr_resend_queue;
99 
100  ngx_queue_t name_expire_queue;
101  ngx_queue_t addr_expire_queue;
102 
103  time_t resend_timeout;
104  time_t expire;
105  time_t valid;
106 
107  ngx_uint_t log_level;
108 } ngx_resolver_t;
109 
110 
111 struct ngx_resolver_ctx_s {
112  ngx_resolver_ctx_t *next;
113  ngx_resolver_t *resolver;
114  ngx_udp_connection_t *udp_connection;
115 
116  /* ident must be after 3 pointers */
117  ngx_int_t ident;
118 
119  ngx_int_t state;
120  ngx_int_t type;
121  ngx_str_t name;
122 
123  ngx_uint_t naddrs;
124  in_addr_t *addrs;
125  in_addr_t addr;
126 
127  ngx_resolver_handler_pt handler;
128  void *data;
129  ngx_msec_t timeout;
130 
131  ngx_uint_t quick; /* unsigned quick:1; */
132  ngx_uint_t recursion;
133  ngx_event_t *event;
134 };
135 
136 
137 ngx_resolver_t *ngx_resolver_create(ngx_conf_t *cf, ngx_str_t *names,
138  ngx_uint_t n);
139 ngx_resolver_ctx_t *ngx_resolve_start(ngx_resolver_t *r,
140  ngx_resolver_ctx_t *temp);
141 ngx_int_t ngx_resolve_name(ngx_resolver_ctx_t *ctx);
142 void ngx_resolve_name_done(ngx_resolver_ctx_t *ctx);
143 ngx_int_t ngx_resolve_addr(ngx_resolver_ctx_t *ctx);
144 void ngx_resolve_addr_done(ngx_resolver_ctx_t *ctx);
145 char *ngx_resolver_strerror(ngx_int_t err);
146 
147 
148 #endif /* _NGX_RESOLVER_H_INCLUDED_ */
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