Mercurial > hg > nginx
view src/core/ngx_resolver.h @ 6272:b6a665bf858a
HTTP/2: fix indirect reprioritization.
Previously, streams that were indirectly reprioritized (either because of
a new exclusive dependency on their parent or because of removal of their
parent from the dependency tree), didn't have their pointer to the parent
node updated.
This broke detection of circular dependencies and, as a result, nginx
worker would crash due to stack overflow whenever such dependency was
introduced.
Found with afl-fuzz.
Signed-off-by: Piotr Sikora <piotrsikora@google.com>
author | Piotr Sikora <piotrsikora@google.com> |
---|---|
date | Thu, 01 Oct 2015 20:25:55 -0700 |
parents | 5004210e8c78 |
children | 7316c57e4fe7 |
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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_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_connection_t *connection; struct sockaddr *sockaddr; socklen_t socklen; ngx_str_t server; ngx_log_t log; } 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 { /* PTR: resolved name, A: name to resolve */ u_char *name; ngx_queue_t queue; /* event ident must be after 3 pointers as in ngx_connection_t */ ngx_int_t ident; ngx_rbtree_node_t node; #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; } u; u_char code; u_short naddrs; 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; ngx_resolver_ctx_t *waiting; } ngx_resolver_node_t; typedef struct { /* 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 udp_connections; ngx_uint_t last_connection; 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; #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 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; ngx_int_t state; ngx_str_t name; ngx_uint_t naddrs; ngx_addr_t *addrs; ngx_addr_t addr; struct sockaddr_in sin; ngx_resolver_handler_pt handler; void *data; ngx_msec_t timeout; ngx_uint_t quick; /* unsigned quick: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_ */