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HTTP/2: fixed connection finalization. All streams in connection must be finalized before the connection itself can be finalized and all related memory is freed. That's not always possible on the current event loop iteration. Thus when the last stream is finalized, it sets the special read event handler ngx_http_v2_handle_connection_handler() and posts the event. Previously, this handler didn't check the connection state and could call the regular event handler on a connection that was already in finalization stage. In the worst case that could lead to a segmentation fault, since some data structures aren't supposed to be used during connection finalization. Particularly, the waiting queue can contain already freed streams, so the WINDOW_UPDATE frame received by that moment could trigger accessing to these freed streams. Now, the connection error flag is explicitly checked in ngx_http_v2_handle_connection_handler().
author Valentin Bartenev <vbart@nginx.com>
date Wed, 29 Mar 2017 20:21:01 +0300
parents b802b7e1d9bc
children beeac3302e45
line wrap: on
line source


/*
 * Copyright (C) Igor Sysoev
 * Copyright (C) Nginx, Inc.
 */


#ifndef _NGX_INET_H_INCLUDED_
#define _NGX_INET_H_INCLUDED_


#include <ngx_config.h>
#include <ngx_core.h>


#define NGX_INET_ADDRSTRLEN   (sizeof("255.255.255.255") - 1)
#define NGX_INET6_ADDRSTRLEN                                                 \
    (sizeof("ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255") - 1)
#define NGX_UNIX_ADDRSTRLEN                                                  \
    (sizeof(struct sockaddr_un) - offsetof(struct sockaddr_un, sun_path))

#if (NGX_HAVE_UNIX_DOMAIN)
#define NGX_SOCKADDR_STRLEN   (sizeof("unix:") - 1 + NGX_UNIX_ADDRSTRLEN)
#elif (NGX_HAVE_INET6)
#define NGX_SOCKADDR_STRLEN   (NGX_INET6_ADDRSTRLEN + sizeof("[]:65535") - 1)
#else
#define NGX_SOCKADDR_STRLEN   (NGX_INET_ADDRSTRLEN + sizeof(":65535") - 1)
#endif

/* compatibility */
#define NGX_SOCKADDRLEN       sizeof(ngx_sockaddr_t)


typedef union {
    struct sockaddr           sockaddr;
    struct sockaddr_in        sockaddr_in;
#if (NGX_HAVE_INET6)
    struct sockaddr_in6       sockaddr_in6;
#endif
#if (NGX_HAVE_UNIX_DOMAIN)
    struct sockaddr_un        sockaddr_un;
#endif
} ngx_sockaddr_t;


typedef struct {
    in_addr_t                 addr;
    in_addr_t                 mask;
} ngx_in_cidr_t;


#if (NGX_HAVE_INET6)

typedef struct {
    struct in6_addr           addr;
    struct in6_addr           mask;
} ngx_in6_cidr_t;

#endif


typedef struct {
    ngx_uint_t                family;
    union {
        ngx_in_cidr_t         in;
#if (NGX_HAVE_INET6)
        ngx_in6_cidr_t        in6;
#endif
    } u;
} ngx_cidr_t;


typedef struct {
    struct sockaddr          *sockaddr;
    socklen_t                 socklen;
    ngx_str_t                 name;
} ngx_addr_t;


typedef struct {
    ngx_str_t                 url;
    ngx_str_t                 host;
    ngx_str_t                 port_text;
    ngx_str_t                 uri;

    in_port_t                 port;
    in_port_t                 default_port;
    int                       family;

    unsigned                  listen:1;
    unsigned                  uri_part:1;
    unsigned                  no_resolve:1;

    unsigned                  no_port:1;
    unsigned                  wildcard:1;

    socklen_t                 socklen;
    ngx_sockaddr_t            sockaddr;

    ngx_addr_t               *addrs;
    ngx_uint_t                naddrs;

    char                     *err;
} ngx_url_t;


in_addr_t ngx_inet_addr(u_char *text, size_t len);
#if (NGX_HAVE_INET6)
ngx_int_t ngx_inet6_addr(u_char *p, size_t len, u_char *addr);
size_t ngx_inet6_ntop(u_char *p, u_char *text, size_t len);
#endif
size_t ngx_sock_ntop(struct sockaddr *sa, socklen_t socklen, u_char *text,
    size_t len, ngx_uint_t port);
size_t ngx_inet_ntop(int family, void *addr, u_char *text, size_t len);
ngx_int_t ngx_ptocidr(ngx_str_t *text, ngx_cidr_t *cidr);
ngx_int_t ngx_cidr_match(struct sockaddr *sa, ngx_array_t *cidrs);
ngx_int_t ngx_parse_addr(ngx_pool_t *pool, ngx_addr_t *addr, u_char *text,
    size_t len);
ngx_int_t ngx_parse_addr_port(ngx_pool_t *pool, ngx_addr_t *addr,
    u_char *text, size_t len);
ngx_int_t ngx_parse_url(ngx_pool_t *pool, ngx_url_t *u);
ngx_int_t ngx_inet_resolve_host(ngx_pool_t *pool, ngx_url_t *u);
ngx_int_t ngx_cmp_sockaddr(struct sockaddr *sa1, socklen_t slen1,
    struct sockaddr *sa2, socklen_t slen2, ngx_uint_t cmp_port);
in_port_t ngx_inet_get_port(struct sockaddr *sa);
void ngx_inet_set_port(struct sockaddr *sa, in_port_t port);


#endif /* _NGX_INET_H_INCLUDED_ */