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view src/http/ngx_http_script.h @ 7354:1812f1d79d84

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Fixed socket leak with "return 444" in error_page (ticket #274). Socket leak was observed in the following configuration: error_page 400 = /close; location = /close { return 444; } The problem is that "return 444" triggers termination of the request, and due to error_page termination thinks that it needs to use a posted request to clear stack. But at the early request processing where 400 errors are generated there are no ngx_http_run_posted_requests() calls, so the request is only terminated after an external event. Variants of the problem include "error_page 497" instead (ticket #695) and various other errors generated during early request processing (405, 414, 421, 494, 495, 496, 501, 505). The same problem can be also triggered with "return 499" and "return 408" as both codes trigger ngx_http_terminate_request(), much like "return 444". To fix this, the patch adds ngx_http_run_posted_requests() calls to ngx_http_process_request_line() and ngx_http_process_request_headers() functions, and to ngx_http_v2_run_request() and ngx_http_v2_push_stream() functions in HTTP/2. Since the ngx_http_process_request() function is now only called via other functions which call ngx_http_run_posted_requests(), the call there is no longer needed and was removed.
author Maxim Dounin <mdounin@mdounin.ru>
date Fri, 21 Sep 2018 15:59:30 +0300
parents e4590dfd97ff
children 5efc23d83bc2
line wrap: on
line source


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


#ifndef _NGX_HTTP_SCRIPT_H_INCLUDED_
#define _NGX_HTTP_SCRIPT_H_INCLUDED_


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


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

    ngx_str_t                   buf;
    ngx_str_t                   line;

    /* the start of the rewritten arguments */
    u_char                     *args;

    unsigned                    flushed:1;
    unsigned                    skip:1;
    unsigned                    quote:1;
    unsigned                    is_args:1;
    unsigned                    log:1;

    ngx_int_t                   status;
    ngx_http_request_t         *request;
} ngx_http_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                  captures_mask;
    ngx_uint_t                  size;

    void                       *main;

    unsigned                    compile_args:1;
    unsigned                    complete_lengths:1;
    unsigned                    complete_values:1;
    unsigned                    zero:1;
    unsigned                    conf_prefix:1;
    unsigned                    root_prefix:1;

    unsigned                    dup_capture:1;
    unsigned                    args:1;
} ngx_http_script_compile_t;


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


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

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


typedef void (*ngx_http_script_code_pt) (ngx_http_script_engine_t *e);
typedef size_t (*ngx_http_script_len_code_pt) (ngx_http_script_engine_t *e);


typedef struct {
    ngx_http_script_code_pt     code;
    uintptr_t                   len;
} ngx_http_script_copy_code_t;


typedef struct {
    ngx_http_script_code_pt     code;
    uintptr_t                   index;
} ngx_http_script_var_code_t;


typedef struct {
    ngx_http_script_code_pt     code;
    ngx_http_set_variable_pt    handler;
    uintptr_t                   data;
} ngx_http_script_var_handler_code_t;


typedef struct {
    ngx_http_script_code_pt     code;
    uintptr_t                   n;
} ngx_http_script_copy_capture_code_t;


#if (NGX_PCRE)

typedef struct {
    ngx_http_script_code_pt     code;
    ngx_http_regex_t           *regex;
    ngx_array_t                *lengths;
    uintptr_t                   size;
    uintptr_t                   status;
    uintptr_t                   next;

    unsigned                    test:1;
    unsigned                    negative_test:1;
    unsigned                    uri:1;
    unsigned                    args:1;

    /* add the r->args to the new arguments */
    unsigned                    add_args:1;

    unsigned                    redirect:1;
    unsigned                    break_cycle:1;

    ngx_str_t                   name;
} ngx_http_script_regex_code_t;


typedef struct {
    ngx_http_script_code_pt     code;

    unsigned                    uri:1;
    unsigned                    args:1;

    /* add the r->args to the new arguments */
    unsigned                    add_args:1;

    unsigned                    redirect:1;
} ngx_http_script_regex_end_code_t;

#endif


typedef struct {
    ngx_http_script_code_pt     code;
    uintptr_t                   conf_prefix;
} ngx_http_script_full_name_code_t;


typedef struct {
    ngx_http_script_code_pt     code;
    uintptr_t                   status;
    ngx_http_complex_value_t    text;
} ngx_http_script_return_code_t;


typedef enum {
    ngx_http_script_file_plain = 0,
    ngx_http_script_file_not_plain,
    ngx_http_script_file_dir,
    ngx_http_script_file_not_dir,
    ngx_http_script_file_exists,
    ngx_http_script_file_not_exists,
    ngx_http_script_file_exec,
    ngx_http_script_file_not_exec
} ngx_http_script_file_op_e;


typedef struct {
    ngx_http_script_code_pt     code;
    uintptr_t                   op;
} ngx_http_script_file_code_t;


typedef struct {
    ngx_http_script_code_pt     code;
    uintptr_t                   next;
    void                      **loc_conf;
} ngx_http_script_if_code_t;


typedef struct {
    ngx_http_script_code_pt     code;
    ngx_array_t                *lengths;
} ngx_http_script_complex_value_code_t;


typedef struct {
    ngx_http_script_code_pt     code;
    uintptr_t                   value;
    uintptr_t                   text_len;
    uintptr_t                   text_data;
} ngx_http_script_value_code_t;


void ngx_http_script_flush_complex_value(ngx_http_request_t *r,
    ngx_http_complex_value_t *val);
ngx_int_t ngx_http_complex_value(ngx_http_request_t *r,
    ngx_http_complex_value_t *val, ngx_str_t *value);
ngx_int_t ngx_http_compile_complex_value(ngx_http_compile_complex_value_t *ccv);
char *ngx_http_set_complex_value_slot(ngx_conf_t *cf, ngx_command_t *cmd,
    void *conf);


ngx_int_t ngx_http_test_predicates(ngx_http_request_t *r,
    ngx_array_t *predicates);
char *ngx_http_set_predicate_slot(ngx_conf_t *cf, ngx_command_t *cmd,
    void *conf);

ngx_uint_t ngx_http_script_variables_count(ngx_str_t *value);
ngx_int_t ngx_http_script_compile(ngx_http_script_compile_t *sc);
u_char *ngx_http_script_run(ngx_http_request_t *r, ngx_str_t *value,
    void *code_lengths, size_t reserved, void *code_values);
void ngx_http_script_flush_no_cacheable_variables(ngx_http_request_t *r,
    ngx_array_t *indices);

void *ngx_http_script_start_code(ngx_pool_t *pool, ngx_array_t **codes,
    size_t size);
void *ngx_http_script_add_code(ngx_array_t *codes, size_t size, void *code);

size_t ngx_http_script_copy_len_code(ngx_http_script_engine_t *e);
void ngx_http_script_copy_code(ngx_http_script_engine_t *e);
size_t ngx_http_script_copy_var_len_code(ngx_http_script_engine_t *e);
void ngx_http_script_copy_var_code(ngx_http_script_engine_t *e);
size_t ngx_http_script_copy_capture_len_code(ngx_http_script_engine_t *e);
void ngx_http_script_copy_capture_code(ngx_http_script_engine_t *e);
size_t ngx_http_script_mark_args_code(ngx_http_script_engine_t *e);
void ngx_http_script_start_args_code(ngx_http_script_engine_t *e);
#if (NGX_PCRE)
void ngx_http_script_regex_start_code(ngx_http_script_engine_t *e);
void ngx_http_script_regex_end_code(ngx_http_script_engine_t *e);
#endif
void ngx_http_script_return_code(ngx_http_script_engine_t *e);
void ngx_http_script_break_code(ngx_http_script_engine_t *e);
void ngx_http_script_if_code(ngx_http_script_engine_t *e);
void ngx_http_script_equal_code(ngx_http_script_engine_t *e);
void ngx_http_script_not_equal_code(ngx_http_script_engine_t *e);
void ngx_http_script_file_code(ngx_http_script_engine_t *e);
void ngx_http_script_complex_value_code(ngx_http_script_engine_t *e);
void ngx_http_script_value_code(ngx_http_script_engine_t *e);
void ngx_http_script_set_var_code(ngx_http_script_engine_t *e);
void ngx_http_script_var_set_handler_code(ngx_http_script_engine_t *e);
void ngx_http_script_var_code(ngx_http_script_engine_t *e);
void ngx_http_script_nop_code(ngx_http_script_engine_t *e);


#endif /* _NGX_HTTP_SCRIPT_H_INCLUDED_ */