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view src/stream/ngx_stream_variables.h @ 7629:f47f7d3d1bfa

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Mp4: fixed possible chunk offset overflow. In "co64" atom chunk start offset is a 64-bit unsigned integer. When trimming the "mdat" atom, chunk offsets are casted to off_t values which are typically 64-bit signed integers. A specially crafted mp4 file with huge chunk offsets may lead to off_t overflow and result in negative trim boundaries. The consequences of the overflow are: - Incorrect Content-Length header value in the response. - Negative left boundary of the response file buffer holding the trimmed "mdat". This leads to pread()/sendfile() errors followed by closing the client connection. On rare systems where off_t is a 32-bit integer, this scenario is also feasible with the "stco" atom. The fix is to add checks which make sure data chunks referenced by each track are within the mp4 file boundaries. Additionally a few more checks are added to ensure mp4 file consistency and log errors.
author Roman Arutyunyan <arut@nginx.com>
date Wed, 26 Feb 2020 15:10:46 +0300
parents 2a288909abc6
children
line wrap: on
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/*
 * Copyright (C) Igor Sysoev
 * Copyright (C) Nginx, Inc.
 */


#ifndef _NGX_STREAM_VARIABLES_H_INCLUDED_
#define _NGX_STREAM_VARIABLES_H_INCLUDED_


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


typedef ngx_variable_value_t  ngx_stream_variable_value_t;

#define ngx_stream_variable(v)     { sizeof(v) - 1, 1, 0, 0, 0, (u_char *) v }

typedef struct ngx_stream_variable_s  ngx_stream_variable_t;

typedef void (*ngx_stream_set_variable_pt) (ngx_stream_session_t *s,
    ngx_stream_variable_value_t *v, uintptr_t data);
typedef ngx_int_t (*ngx_stream_get_variable_pt) (ngx_stream_session_t *s,
    ngx_stream_variable_value_t *v, uintptr_t data);


#define NGX_STREAM_VAR_CHANGEABLE   1
#define NGX_STREAM_VAR_NOCACHEABLE  2
#define NGX_STREAM_VAR_INDEXED      4
#define NGX_STREAM_VAR_NOHASH       8
#define NGX_STREAM_VAR_WEAK         16
#define NGX_STREAM_VAR_PREFIX       32


struct ngx_stream_variable_s {
    ngx_str_t                     name;   /* must be first to build the hash */
    ngx_stream_set_variable_pt    set_handler;
    ngx_stream_get_variable_pt    get_handler;
    uintptr_t                     data;
    ngx_uint_t                    flags;
    ngx_uint_t                    index;
};

#define ngx_stream_null_variable  { ngx_null_string, NULL, NULL, 0, 0, 0 }


ngx_stream_variable_t *ngx_stream_add_variable(ngx_conf_t *cf, ngx_str_t *name,
    ngx_uint_t flags);
ngx_int_t ngx_stream_get_variable_index(ngx_conf_t *cf, ngx_str_t *name);
ngx_stream_variable_value_t *ngx_stream_get_indexed_variable(
    ngx_stream_session_t *s, ngx_uint_t index);
ngx_stream_variable_value_t *ngx_stream_get_flushed_variable(
    ngx_stream_session_t *s, ngx_uint_t index);

ngx_stream_variable_value_t *ngx_stream_get_variable(ngx_stream_session_t *s,
    ngx_str_t *name, ngx_uint_t key);


#if (NGX_PCRE)

typedef struct {
    ngx_uint_t                    capture;
    ngx_int_t                     index;
} ngx_stream_regex_variable_t;


typedef struct {
    ngx_regex_t                  *regex;
    ngx_uint_t                    ncaptures;
    ngx_stream_regex_variable_t  *variables;
    ngx_uint_t                    nvariables;
    ngx_str_t                     name;
} ngx_stream_regex_t;


typedef struct {
    ngx_stream_regex_t           *regex;
    void                         *value;
} ngx_stream_map_regex_t;


ngx_stream_regex_t *ngx_stream_regex_compile(ngx_conf_t *cf,
    ngx_regex_compile_t *rc);
ngx_int_t ngx_stream_regex_exec(ngx_stream_session_t *s, ngx_stream_regex_t *re,
    ngx_str_t *str);

#endif


typedef struct {
    ngx_hash_combined_t           hash;
#if (NGX_PCRE)
    ngx_stream_map_regex_t       *regex;
    ngx_uint_t                    nregex;
#endif
} ngx_stream_map_t;


void *ngx_stream_map_find(ngx_stream_session_t *s, ngx_stream_map_t *map,
    ngx_str_t *match);


ngx_int_t ngx_stream_variables_add_core_vars(ngx_conf_t *cf);
ngx_int_t ngx_stream_variables_init_vars(ngx_conf_t *cf);


extern ngx_stream_variable_value_t  ngx_stream_variable_null_value;
extern ngx_stream_variable_value_t  ngx_stream_variable_true_value;


#endif /* _NGX_STREAM_VARIABLES_H_INCLUDED_ */