view src/stream/ngx_stream_script.h @ 7726:559d19037984

Limit req: unlocking of nodes on complex value errors. Previously, if there were multiple limits configured, errors in ngx_http_complex_value() during processing of a non-first limit resulted in reference count leak in shared memory nodes of already processed limits. Fix is to explicity unlock relevant nodes, much like we do when rejecting requests.
author Maxim Dounin <mdounin@mdounin.ru>
date Thu, 08 Oct 2020 17:44:34 +0300
parents b82162b8496a
children 3ab8e1e2f0f7
line wrap: on
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/*
 * Copyright (C) Igor Sysoev
 * Copyright (C) Nginx, Inc.
 */


#ifndef _NGX_STREAM_SCRIPT_H_INCLUDED_
#define _NGX_STREAM_SCRIPT_H_INCLUDED_


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


typedef struct {
    u_char                       *ip;
    u_char                       *pos;
    ngx_stream_variable_value_t  *sp;

    ngx_str_t                     buf;
    ngx_str_t                     line;

    unsigned                      flushed:1;
    unsigned                      skip:1;

    ngx_stream_session_t         *session;
} ngx_stream_script_engine_t;


typedef struct {
    ngx_conf_t                   *cf;
    ngx_str_t                    *source;

    ngx_array_t                 **flushes;
    ngx_array_t                 **lengths;
    ngx_array_t                 **values;

    ngx_uint_t                    variables;
    ngx_uint_t                    ncaptures;
    ngx_uint_t                    size;

    void                         *main;

    unsigned                      complete_lengths:1;
    unsigned                      complete_values:1;
    unsigned                      zero:1;
    unsigned                      conf_prefix:1;
    unsigned                      root_prefix:1;
} ngx_stream_script_compile_t;


typedef struct {
    ngx_str_t                     value;
    ngx_uint_t                   *flushes;
    void                         *lengths;
    void                         *values;

    union {
        size_t                    size;
    } u;
} ngx_stream_complex_value_t;


typedef struct {
    ngx_conf_t                   *cf;
    ngx_str_t                    *value;
    ngx_stream_complex_value_t   *complex_value;

    unsigned                      zero:1;
    unsigned                      conf_prefix:1;
    unsigned                      root_prefix:1;
} ngx_stream_compile_complex_value_t;


typedef void (*ngx_stream_script_code_pt) (ngx_stream_script_engine_t *e);
typedef size_t (*ngx_stream_script_len_code_pt) (ngx_stream_script_engine_t *e);


typedef struct {
    ngx_stream_script_code_pt     code;
    uintptr_t                     len;
} ngx_stream_script_copy_code_t;


typedef struct {
    ngx_stream_script_code_pt     code;
    uintptr_t                     index;
} ngx_stream_script_var_code_t;


typedef struct {
    ngx_stream_script_code_pt     code;
    uintptr_t                     n;
} ngx_stream_script_copy_capture_code_t;


typedef struct {
    ngx_stream_script_code_pt     code;
    uintptr_t                     conf_prefix;
} ngx_stream_script_full_name_code_t;


void ngx_stream_script_flush_complex_value(ngx_stream_session_t *s,
    ngx_stream_complex_value_t *val);
ngx_int_t ngx_stream_complex_value(ngx_stream_session_t *s,
    ngx_stream_complex_value_t *val, ngx_str_t *value);
size_t ngx_stream_complex_value_size(ngx_stream_session_t *s,
    ngx_stream_complex_value_t *val, size_t default_value);
ngx_int_t ngx_stream_compile_complex_value(
    ngx_stream_compile_complex_value_t *ccv);
char *ngx_stream_set_complex_value_slot(ngx_conf_t *cf, ngx_command_t *cmd,
    void *conf);
char *ngx_stream_set_complex_value_size_slot(ngx_conf_t *cf, ngx_command_t *cmd,
    void *conf);


ngx_uint_t ngx_stream_script_variables_count(ngx_str_t *value);
ngx_int_t ngx_stream_script_compile(ngx_stream_script_compile_t *sc);
u_char *ngx_stream_script_run(ngx_stream_session_t *s, ngx_str_t *value,
    void *code_lengths, size_t reserved, void *code_values);
void ngx_stream_script_flush_no_cacheable_variables(ngx_stream_session_t *s,
    ngx_array_t *indices);

void *ngx_stream_script_add_code(ngx_array_t *codes, size_t size, void *code);

size_t ngx_stream_script_copy_len_code(ngx_stream_script_engine_t *e);
void ngx_stream_script_copy_code(ngx_stream_script_engine_t *e);
size_t ngx_stream_script_copy_var_len_code(ngx_stream_script_engine_t *e);
void ngx_stream_script_copy_var_code(ngx_stream_script_engine_t *e);
size_t ngx_stream_script_copy_capture_len_code(ngx_stream_script_engine_t *e);
void ngx_stream_script_copy_capture_code(ngx_stream_script_engine_t *e);

#endif /* _NGX_STREAM_SCRIPT_H_INCLUDED_ */