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ngx_resolver.h
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/*
* Copyright (C) Igor Sysoev
* Copyright (C) Nginx, Inc.
*/
#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
#if (NGX_HAVE_INET6)
#define NGX_RESOLVE_AAAA 28
#endif
#define NGX_RESOLVE_SRV 33
#define NGX_RESOLVE_DNAME 39
#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
#define NGX_RESOLVER_MAX_RECURSION 50
typedef struct ngx_resolver_s ngx_resolver_t;
typedef struct {
ngx_connection_t *udp;
ngx_connection_t *tcp;
struct sockaddr *sockaddr;
socklen_t socklen;
ngx_str_t server;
ngx_log_t log;
ngx_buf_t *read_buf;
ngx_buf_t *write_buf;
ngx_resolver_t *resolver;
} ngx_resolver_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 {
struct sockaddr *sockaddr;
socklen_t socklen;
ngx_str_t name;
u_short priority;
u_short weight;
} ngx_resolver_addr_t;
typedef struct {
ngx_str_t name;
u_short priority;
u_short weight;
u_short port;
} ngx_resolver_srv_t;
typedef struct {
ngx_str_t name;
u_short priority;
u_short weight;
u_short port;
ngx_resolver_ctx_t *ctx;
ngx_int_t state;
ngx_uint_t naddrs;
ngx_addr_t *addrs;
} ngx_resolver_srv_name_t;
typedef struct {
ngx_rbtree_node_t node;
ngx_queue_t queue;
/* PTR: resolved name, A: name to resolve */
u_char *name;
#if (NGX_HAVE_INET6)
/* PTR: IPv6 address to resolve (IPv4 address is in rbtree node key) */
struct in6_addr addr6;
#endif
u_short nlen;
u_short qlen;
u_char *query;
#if (NGX_HAVE_INET6)
u_char *query6;
#endif
union {
in_addr_t addr;
in_addr_t *addrs;
u_char *cname;
ngx_resolver_srv_t *srvs;
} u;
u_char code;
u_short naddrs;
u_short nsrvs;
u_short cnlen;
#if (NGX_HAVE_INET6)
union {
struct in6_addr addr6;
struct in6_addr *addrs6;
} u6;
u_short naddrs6;
#endif
time_t expire;
time_t valid;
uint32_t ttl;
unsigned tcp:1;
#if (NGX_HAVE_INET6)
unsigned tcp6:1;
#endif
ngx_uint_t last_connection;
ngx_resolver_ctx_t *waiting;
} ngx_resolver_node_t;
struct ngx_resolver_s {
/* has to be pointer because of "incomplete type" */
ngx_event_t *event;
void *dummy;
ngx_log_t *log;
/* event ident must be after 3 pointers as in ngx_connection_t */
ngx_int_t ident;
/* simple round robin DNS peers balancer */
ngx_array_t connections;
ngx_uint_t last_connection;
ngx_rbtree_t name_rbtree;
ngx_rbtree_node_t name_sentinel;
ngx_rbtree_t srv_rbtree;
ngx_rbtree_node_t srv_sentinel;
ngx_rbtree_t addr_rbtree;
ngx_rbtree_node_t addr_sentinel;
ngx_queue_t name_resend_queue;
ngx_queue_t srv_resend_queue;
ngx_queue_t addr_resend_queue;
ngx_queue_t name_expire_queue;
ngx_queue_t srv_expire_queue;
ngx_queue_t addr_expire_queue;
#if (NGX_HAVE_INET6)
ngx_uint_t ipv6; /* unsigned ipv6:1; */
ngx_rbtree_t addr6_rbtree;
ngx_rbtree_node_t addr6_sentinel;
ngx_queue_t addr6_resend_queue;
ngx_queue_t addr6_expire_queue;
#endif
time_t resend_timeout;
time_t tcp_timeout;
time_t expire;
time_t valid;
ngx_uint_t log_level;
};
struct ngx_resolver_ctx_s {
ngx_resolver_ctx_t *next;
ngx_resolver_t *resolver;
ngx_resolver_node_t *node;
/* event ident must be after 3 pointers as in ngx_connection_t */
ngx_int_t ident;
ngx_int_t state;
ngx_str_t name;
ngx_str_t service;
time_t valid;
ngx_uint_t naddrs;
ngx_resolver_addr_t *addrs;
ngx_resolver_addr_t addr;
struct sockaddr_in sin;
ngx_uint_t count;
ngx_uint_t nsrvs;
ngx_resolver_srv_name_t *srvs;
ngx_resolver_handler_pt handler;
void *data;
ngx_msec_t timeout;
unsigned quick:1;
unsigned async:1;
unsigned cancelable:1;
ngx_uint_t recursion;
ngx_event_t *event;
};
ngx_resolver_t *ngx_resolver_create(ngx_conf_t *cf, ngx_str_t *names,
ngx_uint_t n);
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_ */