mirror of
https://github.com/nginx/nginx.git
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194 lines
4.9 KiB
C
194 lines
4.9 KiB
C
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/*
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* Copyright (C) Igor Sysoev
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* Copyright (C) Nginx, Inc.
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*/
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#include <ngx_config.h>
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#include <ngx_core.h>
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#ifndef _NGX_RESOLVER_H_INCLUDED_
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#define _NGX_RESOLVER_H_INCLUDED_
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#define NGX_RESOLVE_A 1
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#define NGX_RESOLVE_CNAME 5
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#define NGX_RESOLVE_PTR 12
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#define NGX_RESOLVE_MX 15
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#define NGX_RESOLVE_TXT 16
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#if (NGX_HAVE_INET6)
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#define NGX_RESOLVE_AAAA 28
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#endif
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#define NGX_RESOLVE_DNAME 39
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#define NGX_RESOLVE_FORMERR 1
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#define NGX_RESOLVE_SERVFAIL 2
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#define NGX_RESOLVE_NXDOMAIN 3
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#define NGX_RESOLVE_NOTIMP 4
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#define NGX_RESOLVE_REFUSED 5
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#define NGX_RESOLVE_TIMEDOUT NGX_ETIMEDOUT
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#define NGX_NO_RESOLVER (void *) -1
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#define NGX_RESOLVER_MAX_RECURSION 50
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typedef struct ngx_resolver_s ngx_resolver_t;
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typedef struct {
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ngx_connection_t *udp;
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ngx_connection_t *tcp;
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struct sockaddr *sockaddr;
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socklen_t socklen;
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ngx_str_t server;
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ngx_log_t log;
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ngx_buf_t *read_buf;
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ngx_buf_t *write_buf;
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ngx_resolver_t *resolver;
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} ngx_resolver_connection_t;
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typedef struct ngx_resolver_ctx_s ngx_resolver_ctx_t;
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typedef void (*ngx_resolver_handler_pt)(ngx_resolver_ctx_t *ctx);
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typedef struct {
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ngx_rbtree_node_t node;
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ngx_queue_t queue;
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/* PTR: resolved name, A: name to resolve */
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u_char *name;
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#if (NGX_HAVE_INET6)
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/* PTR: IPv6 address to resolve (IPv4 address is in rbtree node key) */
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struct in6_addr addr6;
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#endif
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u_short nlen;
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u_short qlen;
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u_char *query;
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#if (NGX_HAVE_INET6)
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u_char *query6;
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#endif
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union {
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in_addr_t addr;
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in_addr_t *addrs;
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u_char *cname;
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} u;
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u_char code;
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u_short naddrs;
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u_short cnlen;
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#if (NGX_HAVE_INET6)
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union {
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struct in6_addr addr6;
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struct in6_addr *addrs6;
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} u6;
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u_short naddrs6;
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#endif
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time_t expire;
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time_t valid;
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uint32_t ttl;
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unsigned tcp:1;
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#if (NGX_HAVE_INET6)
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unsigned tcp6:1;
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#endif
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ngx_uint_t last_connection;
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ngx_resolver_ctx_t *waiting;
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} ngx_resolver_node_t;
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struct ngx_resolver_s {
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/* has to be pointer because of "incomplete type" */
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ngx_event_t *event;
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void *dummy;
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ngx_log_t *log;
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/* event ident must be after 3 pointers as in ngx_connection_t */
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ngx_int_t ident;
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/* simple round robin DNS peers balancer */
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ngx_array_t connections;
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ngx_uint_t last_connection;
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ngx_rbtree_t name_rbtree;
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ngx_rbtree_node_t name_sentinel;
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ngx_rbtree_t addr_rbtree;
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ngx_rbtree_node_t addr_sentinel;
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ngx_queue_t name_resend_queue;
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ngx_queue_t addr_resend_queue;
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ngx_queue_t name_expire_queue;
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ngx_queue_t addr_expire_queue;
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#if (NGX_HAVE_INET6)
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ngx_uint_t ipv6; /* unsigned ipv6:1; */
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ngx_rbtree_t addr6_rbtree;
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ngx_rbtree_node_t addr6_sentinel;
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ngx_queue_t addr6_resend_queue;
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ngx_queue_t addr6_expire_queue;
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#endif
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time_t resend_timeout;
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time_t tcp_timeout;
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time_t expire;
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time_t valid;
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ngx_uint_t log_level;
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};
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struct ngx_resolver_ctx_s {
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ngx_resolver_ctx_t *next;
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ngx_resolver_t *resolver;
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ngx_resolver_node_t *node;
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/* event ident must be after 3 pointers as in ngx_connection_t */
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ngx_int_t ident;
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ngx_int_t state;
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ngx_str_t name;
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ngx_uint_t naddrs;
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ngx_addr_t *addrs;
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ngx_addr_t addr;
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struct sockaddr_in sin;
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ngx_resolver_handler_pt handler;
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void *data;
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ngx_msec_t timeout;
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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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};
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ngx_resolver_t *ngx_resolver_create(ngx_conf_t *cf, ngx_str_t *names,
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ngx_uint_t n);
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ngx_resolver_ctx_t *ngx_resolve_start(ngx_resolver_t *r,
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ngx_resolver_ctx_t *temp);
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ngx_int_t ngx_resolve_name(ngx_resolver_ctx_t *ctx);
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void ngx_resolve_name_done(ngx_resolver_ctx_t *ctx);
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ngx_int_t ngx_resolve_addr(ngx_resolver_ctx_t *ctx);
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void ngx_resolve_addr_done(ngx_resolver_ctx_t *ctx);
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char *ngx_resolver_strerror(ngx_int_t err);
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#endif /* _NGX_RESOLVER_H_INCLUDED_ */
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