nginx/src/core/ngx_resolver.h

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/*
* Copyright (C) Igor Sysoev
*/
#include <ngx_config.h>
#include <ngx_core.h>
#ifndef _NGX_RESOLVER_H_INCLUDED_
#define _NGX_RESOLVER_H_INCLUDED_
#define NGX_RESOLVE_A 1
#define NGX_RESOLVE_CNAME 5
#define NGX_RESOLVE_PTR 12
#define NGX_RESOLVE_MX 15
#define NGX_RESOLVE_TXT 16
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#define NGX_RESOLVE_DNAME 39
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#define NGX_RESOLVE_FORMERR 1
#define NGX_RESOLVE_SERVFAIL 2
#define NGX_RESOLVE_NXDOMAIN 3
#define NGX_RESOLVE_NOTIMP 4
#define NGX_RESOLVE_REFUSED 5
#define NGX_RESOLVE_TIMEDOUT NGX_ETIMEDOUT
#define NGX_NO_RESOLVER (void *) -1
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#define NGX_RESOLVER_MAX_RECURSION 50
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typedef struct {
ngx_connection_t *connection;
struct sockaddr *sockaddr;
socklen_t socklen;
ngx_str_t server;
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ngx_log_t log;
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} ngx_udp_connection_t;
typedef struct ngx_resolver_ctx_s ngx_resolver_ctx_t;
typedef void (*ngx_resolver_handler_pt)(ngx_resolver_ctx_t *ctx);
typedef struct {
ngx_rbtree_node_t node;
ngx_queue_t queue;
/* PTR: resolved name, A: name to resolve */
u_char *name;
u_short nlen;
u_short qlen;
u_char *query;
union {
in_addr_t addr;
in_addr_t *addrs;
u_char *cname;
} u;
u_short naddrs;
u_short cnlen;
time_t expire;
time_t valid;
ngx_resolver_ctx_t *waiting;
} ngx_resolver_node_t;
typedef struct {
/* has to be pointer because of "incomplete type" */
ngx_event_t *event;
/* TODO: DNS peers balancer */
/* STUB */
ngx_udp_connection_t *udp_connection;
ngx_log_t *log;
/* ident must be after 3 pointers */
ngx_int_t ident;
ngx_rbtree_t name_rbtree;
ngx_rbtree_node_t name_sentinel;
ngx_rbtree_t addr_rbtree;
ngx_rbtree_node_t addr_sentinel;
ngx_queue_t name_resend_queue;
ngx_queue_t addr_resend_queue;
ngx_queue_t name_expire_queue;
ngx_queue_t addr_expire_queue;
time_t resend_timeout;
time_t expire;
time_t valid;
ngx_uint_t log_level;
} ngx_resolver_t;
struct ngx_resolver_ctx_s {
ngx_resolver_ctx_t *next;
ngx_resolver_t *resolver;
ngx_udp_connection_t *udp_connection;
/* ident must be after 3 pointers */
ngx_int_t ident;
ngx_int_t state;
ngx_int_t type;
ngx_str_t name;
ngx_uint_t naddrs;
in_addr_t *addrs;
in_addr_t addr;
/* TODO: DNS peers balancer ctx */
ngx_resolver_handler_pt handler;
void *data;
ngx_msec_t timeout;
ngx_uint_t quick; /* unsigned quick:1; */
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ngx_uint_t recursion;
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ngx_event_t *event;
};
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ngx_resolver_t *ngx_resolver_create(ngx_conf_t *cf, ngx_addr_t *addr);
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ngx_resolver_ctx_t *ngx_resolve_start(ngx_resolver_t *r,
ngx_resolver_ctx_t *temp);
ngx_int_t ngx_resolve_name(ngx_resolver_ctx_t *ctx);
void ngx_resolve_name_done(ngx_resolver_ctx_t *ctx);
ngx_int_t ngx_resolve_addr(ngx_resolver_ctx_t *ctx);
void ngx_resolve_addr_done(ngx_resolver_ctx_t *ctx);
char *ngx_resolver_strerror(ngx_int_t err);
#endif /* _NGX_RESOLVER_H_INCLUDED_ */