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ngx_http_var_module.c
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/*
* Copyright (C) Hanada
*/
#include <ngx_config.h>
#include <ngx_core.h>
#include <ngx_http.h>
#include <ngx_md5.h>
#include <ngx_sha1.h>
#if (NGX_HTTP_SSL)
#include <openssl/evp.h>
#include <openssl/hmac.h>
#endif
typedef enum {
NGX_HTTP_VAR_OP_AND = 0,
NGX_HTTP_VAR_OP_OR,
NGX_HTTP_VAR_OP_NOT,
NGX_HTTP_VAR_OP_IF_EMPTY,
NGX_HTTP_VAR_OP_IF_NOT_EMPTY,
NGX_HTTP_VAR_OP_IF_IS_NUM,
NGX_HTTP_VAR_OP_IF_STR_EQ,
NGX_HTTP_VAR_OP_IF_STR_NE,
NGX_HTTP_VAR_OP_IF_HAS_PREFIX,
NGX_HTTP_VAR_OP_IF_HAS_SUFFIX,
NGX_HTTP_VAR_OP_IF_FIND,
NGX_HTTP_VAR_OP_COPY,
NGX_HTTP_VAR_OP_LEN,
NGX_HTTP_VAR_OP_UPPER,
NGX_HTTP_VAR_OP_LOWER,
NGX_HTTP_VAR_OP_TRIM,
NGX_HTTP_VAR_OP_LTRIM,
NGX_HTTP_VAR_OP_RTRIM,
NGX_HTTP_VAR_OP_REVERSE,
NGX_HTTP_VAR_OP_FIND,
NGX_HTTP_VAR_OP_REPEAT,
NGX_HTTP_VAR_OP_SUBSTR,
NGX_HTTP_VAR_OP_REPLACE,
#if (NGX_PCRE)
NGX_HTTP_VAR_OP_IF_RE_MATCH,
NGX_HTTP_VAR_OP_RE_CAPTURE,
NGX_HTTP_VAR_OP_RE_SUB,
NGX_HTTP_VAR_OP_RE_GSUB,
#endif
NGX_HTTP_VAR_OP_IF_EQ,
NGX_HTTP_VAR_OP_IF_NE,
NGX_HTTP_VAR_OP_IF_LT,
NGX_HTTP_VAR_OP_IF_LE,
NGX_HTTP_VAR_OP_IF_GT,
NGX_HTTP_VAR_OP_IF_GE,
NGX_HTTP_VAR_OP_IF_RANGE,
NGX_HTTP_VAR_OP_ABS,
NGX_HTTP_VAR_OP_MAX,
NGX_HTTP_VAR_OP_MIN,
NGX_HTTP_VAR_OP_ADD,
NGX_HTTP_VAR_OP_SUB,
NGX_HTTP_VAR_OP_MUL,
NGX_HTTP_VAR_OP_DIV,
NGX_HTTP_VAR_OP_MOD,
NGX_HTTP_VAR_OP_ROUND,
NGX_HTTP_VAR_OP_FLOOR,
NGX_HTTP_VAR_OP_CEIL,
NGX_HTTP_VAR_OP_RAND,
NGX_HTTP_VAR_OP_RAND_RANGE,
NGX_HTTP_VAR_OP_HEX_ENCODE,
NGX_HTTP_VAR_OP_HEX_DECODE,
NGX_HTTP_VAR_OP_DEC_TO_HEX,
NGX_HTTP_VAR_OP_HEX_TO_DEC,
NGX_HTTP_VAR_OP_ESCAPE_URI,
NGX_HTTP_VAR_OP_ESCAPE_ARGS,
NGX_HTTP_VAR_OP_ESCAPE_URI_COMPONENT,
NGX_HTTP_VAR_OP_ESCAPE_HTML,
NGX_HTTP_VAR_OP_UNESCAPE_URI,
NGX_HTTP_VAR_OP_BASE64_ENCODE,
NGX_HTTP_VAR_OP_BASE64URL_ENCODE,
NGX_HTTP_VAR_OP_BASE64_DECODE,
NGX_HTTP_VAR_OP_BASE64URL_DECODE,
NGX_HTTP_VAR_OP_CRC32_SHORT,
NGX_HTTP_VAR_OP_CRC32_LONG,
NGX_HTTP_VAR_OP_MD5SUM,
NGX_HTTP_VAR_OP_SHA1SUM,
#if (NGX_HTTP_SSL)
NGX_HTTP_VAR_OP_SHA256SUM,
NGX_HTTP_VAR_OP_SHA384SUM,
NGX_HTTP_VAR_OP_SHA512SUM,
NGX_HTTP_VAR_OP_HMAC_SHA1,
NGX_HTTP_VAR_OP_HMAC_SHA256,
NGX_HTTP_VAR_OP_HMAC_SHA384,
NGX_HTTP_VAR_OP_HMAC_SHA512,
#endif
NGX_HTTP_VAR_OP_IF_TIME_RANGE,
NGX_HTTP_VAR_OP_GMT_TIME,
NGX_HTTP_VAR_OP_LOCAL_TIME,
NGX_HTTP_VAR_OP_UNIX_TIME,
NGX_HTTP_VAR_OP_IF_IP_RANGE,
NGX_HTTP_VAR_OP_UNKNOWN
} ngx_http_var_operator_e;
typedef struct {
ngx_array_t *vars;
} ngx_http_var_conf_t;
typedef struct {
ngx_str_t name; /* variable name */
ngx_http_var_operator_e operator; /* operator type */
ngx_uint_t ignore_case; /* ignore case sensitivity */
ngx_array_t *args; /* operator extra args */
ngx_http_complex_value_t *filter;
ngx_uint_t negative;
#if (NGX_PCRE)
ngx_http_regex_t *regex; /* compiled regex */
#endif
} ngx_http_var_variable_t;
typedef struct {
ngx_uint_t *locked_vars;
ngx_uint_t count;
} ngx_http_var_ctx_t;
typedef struct {
ngx_str_t name; /* operator string */
ngx_http_var_operator_e op; /* operator enum */
ngx_uint_t min_args; /* min number of arguments */
ngx_uint_t max_args; /* max number of arguments */
} ngx_http_var_operator_enum_t;
static ngx_http_var_operator_enum_t ngx_http_var_operators[] = {
{ ngx_string("and"), NGX_HTTP_VAR_OP_AND, 2, 9 },
{ ngx_string("or"), NGX_HTTP_VAR_OP_OR, 2, 9 },
{ ngx_string("not"), NGX_HTTP_VAR_OP_NOT, 1, 1 },
{ ngx_string("if_empty"), NGX_HTTP_VAR_OP_IF_EMPTY, 1, 1 },
{ ngx_string("if_not_empty"), NGX_HTTP_VAR_OP_IF_NOT_EMPTY, 1, 1 },
{ ngx_string("if_is_num"), NGX_HTTP_VAR_OP_IF_IS_NUM, 1, 1 },
{ ngx_string("if_str_eq"), NGX_HTTP_VAR_OP_IF_STR_EQ, 2, 2 },
{ ngx_string("if_str_ne"), NGX_HTTP_VAR_OP_IF_STR_NE, 2, 2 },
{ ngx_string("if_has_prefix"), NGX_HTTP_VAR_OP_IF_HAS_PREFIX, 2, 2 },
{ ngx_string("if_has_suffix"), NGX_HTTP_VAR_OP_IF_HAS_SUFFIX, 2, 2 },
{ ngx_string("if_find"), NGX_HTTP_VAR_OP_IF_FIND, 2, 2 },
{ ngx_string("copy"), NGX_HTTP_VAR_OP_COPY, 1, 1 },
{ ngx_string("len"), NGX_HTTP_VAR_OP_LEN, 1, 1 },
{ ngx_string("upper"), NGX_HTTP_VAR_OP_UPPER, 1, 1 },
{ ngx_string("lower"), NGX_HTTP_VAR_OP_LOWER, 1, 1 },
{ ngx_string("trim"), NGX_HTTP_VAR_OP_TRIM, 1, 1 },
{ ngx_string("ltrim"), NGX_HTTP_VAR_OP_LTRIM, 1, 1 },
{ ngx_string("rtrim"), NGX_HTTP_VAR_OP_RTRIM, 1, 1 },
{ ngx_string("reverse"), NGX_HTTP_VAR_OP_REVERSE, 1, 1 },
{ ngx_string("find"), NGX_HTTP_VAR_OP_FIND, 2, 2 },
{ ngx_string("repeat"), NGX_HTTP_VAR_OP_REPEAT, 2, 2 },
{ ngx_string("substr"), NGX_HTTP_VAR_OP_SUBSTR, 2, 3 },
{ ngx_string("replace"), NGX_HTTP_VAR_OP_REPLACE, 3, 3 },
#if (NGX_PCRE)
{ ngx_string("if_re_match"), NGX_HTTP_VAR_OP_IF_RE_MATCH, 2, 2 },
{ ngx_string("re_capture"), NGX_HTTP_VAR_OP_RE_CAPTURE, 3, 3 },
{ ngx_string("re_sub"), NGX_HTTP_VAR_OP_RE_SUB, 3, 3 },
{ ngx_string("re_gsub"), NGX_HTTP_VAR_OP_RE_GSUB, 3, 3 },
#endif
{ ngx_string("if_eq"), NGX_HTTP_VAR_OP_IF_EQ, 2, 2 },
{ ngx_string("if_ne"), NGX_HTTP_VAR_OP_IF_NE, 2, 2 },
{ ngx_string("if_lt"), NGX_HTTP_VAR_OP_IF_LT, 2, 2 },
{ ngx_string("if_le"), NGX_HTTP_VAR_OP_IF_LE, 2, 2 },
{ ngx_string("if_gt"), NGX_HTTP_VAR_OP_IF_GE, 2, 2 },
{ ngx_string("if_ge"), NGX_HTTP_VAR_OP_IF_GE, 2, 2 },
{ ngx_string("if_range"), NGX_HTTP_VAR_OP_IF_RANGE, 2, 2 },
{ ngx_string("abs"), NGX_HTTP_VAR_OP_ABS, 1, 1 },
{ ngx_string("max"), NGX_HTTP_VAR_OP_MAX, 2, 2 },
{ ngx_string("min"), NGX_HTTP_VAR_OP_MIN, 2, 2 },
{ ngx_string("add"), NGX_HTTP_VAR_OP_ADD, 2, 2 },
{ ngx_string("sub"), NGX_HTTP_VAR_OP_SUB, 2, 2 },
{ ngx_string("mul"), NGX_HTTP_VAR_OP_MUL, 2, 2 },
{ ngx_string("div"), NGX_HTTP_VAR_OP_DIV, 2, 2 },
{ ngx_string("mod"), NGX_HTTP_VAR_OP_MOD, 2, 2 },
{ ngx_string("round"), NGX_HTTP_VAR_OP_ROUND, 2, 2 },
{ ngx_string("floor"), NGX_HTTP_VAR_OP_FLOOR, 1, 1 },
{ ngx_string("ceil"), NGX_HTTP_VAR_OP_CEIL, 1, 1 },
{ ngx_string("rand"), NGX_HTTP_VAR_OP_RAND, 0, 0 },
{ ngx_string("rand_range"), NGX_HTTP_VAR_OP_RAND_RANGE, 1, 1 },
{ ngx_string("hex_encode"), NGX_HTTP_VAR_OP_HEX_ENCODE, 1, 1 },
{ ngx_string("hex_decode"), NGX_HTTP_VAR_OP_HEX_DECODE, 1, 1 },
{ ngx_string("dec_to_hex"), NGX_HTTP_VAR_OP_DEC_TO_HEX, 1, 1 },
{ ngx_string("hex_to_dec"), NGX_HTTP_VAR_OP_HEX_TO_DEC, 1, 1 },
{ ngx_string("escape_uri"), NGX_HTTP_VAR_OP_ESCAPE_URI, 1, 1 },
{ ngx_string("escape_args"), NGX_HTTP_VAR_OP_ESCAPE_ARGS, 1, 1 },
{ ngx_string("escape_uri_component"),
NGX_HTTP_VAR_OP_ESCAPE_URI_COMPONENT, 1, 1 },
{ ngx_string("escape_html"), NGX_HTTP_VAR_OP_ESCAPE_HTML, 1, 1 },
{ ngx_string("unescape_uri"), NGX_HTTP_VAR_OP_UNESCAPE_URI, 1, 1 },
{ ngx_string("base64_encode"), NGX_HTTP_VAR_OP_BASE64_ENCODE, 1, 1 },
{ ngx_string("base64url_encode"), NGX_HTTP_VAR_OP_BASE64URL_ENCODE, 1, 1 },
{ ngx_string("base64_decode"), NGX_HTTP_VAR_OP_BASE64_DECODE, 1, 1 },
{ ngx_string("base64url_decode"), NGX_HTTP_VAR_OP_BASE64URL_DECODE, 1, 1 },
{ ngx_string("crc32_short"), NGX_HTTP_VAR_OP_CRC32_SHORT, 1, 1 },
{ ngx_string("crc32_long"), NGX_HTTP_VAR_OP_CRC32_LONG, 1, 1 },
{ ngx_string("md5sum"), NGX_HTTP_VAR_OP_MD5SUM, 1, 1 },
{ ngx_string("sha1sum"), NGX_HTTP_VAR_OP_SHA1SUM, 1, 1 },
#if (NGX_HTTP_SSL)
{ ngx_string("sha256sum"), NGX_HTTP_VAR_OP_SHA256SUM, 1, 1 },
{ ngx_string("sha384sum"), NGX_HTTP_VAR_OP_SHA384SUM, 1, 1 },
{ ngx_string("sha512sum"), NGX_HTTP_VAR_OP_SHA512SUM, 1, 1 },
{ ngx_string("hmac_sha1"), NGX_HTTP_VAR_OP_HMAC_SHA1, 2, 2 },
{ ngx_string("hmac_sha256"), NGX_HTTP_VAR_OP_HMAC_SHA256, 2, 2 },
{ ngx_string("hmac_sha384"), NGX_HTTP_VAR_OP_HMAC_SHA384, 2, 2 },
{ ngx_string("hmac_sha512"), NGX_HTTP_VAR_OP_HMAC_SHA512, 2, 2 },
#endif
{ ngx_string("if_time_range"), NGX_HTTP_VAR_OP_IF_TIME_RANGE, 1, 8 },
{ ngx_string("gmt_time"), NGX_HTTP_VAR_OP_GMT_TIME, 1, 2 },
{ ngx_string("local_time"), NGX_HTTP_VAR_OP_LOCAL_TIME, 1, 2 },
{ ngx_string("unix_time"), NGX_HTTP_VAR_OP_UNIX_TIME, 0, 3 },
{ ngx_string("if_ip_range"), NGX_HTTP_VAR_OP_IF_IP_RANGE, 2, 9 },
{ ngx_null_string, NGX_HTTP_VAR_OP_UNKNOWN, 0, 0 }
};
static void *ngx_http_var_create_conf(ngx_conf_t *cf);
static char *ngx_http_var_merge_conf(ngx_conf_t *cf,
void *parent, void *child);
static char *ngx_http_var_create_variable(ngx_conf_t *cf,
ngx_command_t *cmd, void *conf);
static ngx_http_var_ctx_t *ngx_http_var_get_lock_ctx(ngx_http_request_t *r);
static ngx_int_t ngx_http_variable_acquire_lock(ngx_http_request_t *r,
ngx_str_t *var_name);
static void ngx_http_variable_release_lock(ngx_http_request_t *r,
ngx_str_t *var_name);
static ngx_int_t ngx_http_var_find_variable(ngx_http_request_t *r,
ngx_str_t *var_name, ngx_http_var_conf_t *vconf,
ngx_http_var_variable_t **found_var);
static ngx_int_t ngx_http_var_evaluate_variable(ngx_http_request_t *r,
ngx_http_variable_value_t *v, ngx_http_var_variable_t *var);
static ngx_int_t ngx_http_var_variable_handler(ngx_http_request_t *r,
ngx_http_variable_value_t *v, uintptr_t data);
static ngx_int_t ngx_http_var_utils_check_str_is_num(ngx_str_t num_str);
static ngx_int_t ngx_http_var_utils_auto_atoi(ngx_str_t val,
ngx_int_t *int_val);
static ngx_int_t ngx_http_var_utils_auto_atofp(ngx_str_t val1, ngx_str_t val2,
ngx_int_t *int_val1, ngx_int_t *int_val2);
static ngx_int_t ngx_http_var_utils_auto_atofp3(ngx_str_t val1, ngx_str_t val2,
ngx_str_t val3, ngx_int_t *int_val1,
ngx_int_t *int_val2, ngx_int_t *int_val3);
static ngx_int_t ngx_http_var_utils_parse_int_range(ngx_str_t str,
ngx_int_t *start, ngx_int_t *end);
static ngx_int_t ngx_http_var_utils_escape_uri(ngx_http_request_t *r,
ngx_http_variable_value_t *v, ngx_http_var_variable_t *var,
ngx_uint_t type);
static u_char * ngx_http_var_utils_strlstrn(u_char *s1, u_char *last,
u_char *s2, size_t n);
#if (NGX_HTTP_SSL)
static ngx_int_t ngx_http_var_utils_set_hmac(ngx_http_request_t *r,
ngx_http_variable_value_t *v, ngx_http_var_variable_t *var,
const EVP_MD *evp_md);
#endif
static ngx_int_t ngx_http_var_do_and(ngx_http_request_t *r,
ngx_http_variable_value_t *v, ngx_http_var_variable_t *var);
static ngx_int_t ngx_http_var_do_or(ngx_http_request_t *r,
ngx_http_variable_value_t *v, ngx_http_var_variable_t *var);
static ngx_int_t ngx_http_var_do_not(ngx_http_request_t *r,
ngx_http_variable_value_t *v, ngx_http_var_variable_t *var);
static ngx_int_t ngx_http_var_do_if_empty(ngx_http_request_t *r,
ngx_http_variable_value_t *v, ngx_http_var_variable_t *var);
static ngx_int_t ngx_http_var_do_if_not_empty(ngx_http_request_t *r,
ngx_http_variable_value_t *v, ngx_http_var_variable_t *var);
static ngx_int_t ngx_http_var_do_if_is_num(ngx_http_request_t *r,
ngx_http_variable_value_t *v, ngx_http_var_variable_t *var);
static ngx_int_t ngx_http_var_do_if_str_eq(ngx_http_request_t *r,
ngx_http_variable_value_t *v, ngx_http_var_variable_t *var);
static ngx_int_t ngx_http_var_do_if_str_ne(ngx_http_request_t *r,
ngx_http_variable_value_t *v, ngx_http_var_variable_t *var);
static ngx_int_t ngx_http_var_do_if_has_prefix(ngx_http_request_t *r,
ngx_http_variable_value_t *v, ngx_http_var_variable_t *var);
static ngx_int_t ngx_http_var_do_if_has_suffix(ngx_http_request_t *r,
ngx_http_variable_value_t *v, ngx_http_var_variable_t *var);
static ngx_int_t ngx_http_var_do_if_find(ngx_http_request_t *r,
ngx_http_variable_value_t *v, ngx_http_var_variable_t *var);
static ngx_int_t ngx_http_var_do_copy(ngx_http_request_t *r,
ngx_http_variable_value_t *v, ngx_http_var_variable_t *var);
static ngx_int_t ngx_http_var_do_len(ngx_http_request_t *r,
ngx_http_variable_value_t *v, ngx_http_var_variable_t *var);
static ngx_int_t ngx_http_var_do_upper(ngx_http_request_t *r,
ngx_http_variable_value_t *v, ngx_http_var_variable_t *var);
static ngx_int_t ngx_http_var_do_lower(ngx_http_request_t *r,
ngx_http_variable_value_t *v, ngx_http_var_variable_t *var);
static ngx_int_t ngx_http_var_do_trim(ngx_http_request_t *r,
ngx_http_variable_value_t *v, ngx_http_var_variable_t *var);
static ngx_int_t ngx_http_var_do_ltrim(ngx_http_request_t *r,
ngx_http_variable_value_t *v, ngx_http_var_variable_t *var);
static ngx_int_t ngx_http_var_do_rtrim(ngx_http_request_t *r,
ngx_http_variable_value_t *v, ngx_http_var_variable_t *var);
static ngx_int_t ngx_http_var_do_reverse(ngx_http_request_t *r,
ngx_http_variable_value_t *v, ngx_http_var_variable_t *var);
static ngx_int_t ngx_http_var_do_find(ngx_http_request_t *r,
ngx_http_variable_value_t *v, ngx_http_var_variable_t *var);
static ngx_int_t ngx_http_var_do_repeat(ngx_http_request_t *r,
ngx_http_variable_value_t *v, ngx_http_var_variable_t *var);
static ngx_int_t ngx_http_var_do_substr(ngx_http_request_t *r,
ngx_http_variable_value_t *v, ngx_http_var_variable_t *var);
static ngx_int_t ngx_http_var_do_replace(ngx_http_request_t *r,
ngx_http_variable_value_t *v, ngx_http_var_variable_t *var);
#if (NGX_PCRE)
static ngx_int_t ngx_http_var_do_if_re_match(ngx_http_request_t *r,
ngx_http_variable_value_t *v, ngx_http_var_variable_t *var);
static ngx_int_t ngx_http_var_do_re_capture(ngx_http_request_t *r,
ngx_http_variable_value_t *v, ngx_http_var_variable_t *var);
static ngx_int_t ngx_http_var_do_re_sub(ngx_http_request_t *r,
ngx_http_variable_value_t *v, ngx_http_var_variable_t *var);
static ngx_int_t ngx_http_var_do_re_gsub(ngx_http_request_t *r,
ngx_http_variable_value_t *v, ngx_http_var_variable_t *var);
#endif
static ngx_int_t ngx_http_var_do_if_eq(ngx_http_request_t *r,
ngx_http_variable_value_t *v, ngx_http_var_variable_t *var);
static ngx_int_t ngx_http_var_do_if_ne(ngx_http_request_t *r,
ngx_http_variable_value_t *v, ngx_http_var_variable_t *var);
static ngx_int_t ngx_http_var_do_if_lt(ngx_http_request_t *r,
ngx_http_variable_value_t *v, ngx_http_var_variable_t *var);
static ngx_int_t ngx_http_var_do_if_le(ngx_http_request_t *r,
ngx_http_variable_value_t *v, ngx_http_var_variable_t *var);
static ngx_int_t ngx_http_var_do_if_gt(ngx_http_request_t *r,
ngx_http_variable_value_t *v, ngx_http_var_variable_t *var);
static ngx_int_t ngx_http_var_do_if_ge(ngx_http_request_t *r,
ngx_http_variable_value_t *v, ngx_http_var_variable_t *var);
static ngx_int_t ngx_http_var_do_if_range(ngx_http_request_t *r,
ngx_http_variable_value_t *v, ngx_http_var_variable_t *var);
static ngx_int_t ngx_http_var_do_abs(ngx_http_request_t *r,
ngx_http_variable_value_t *v, ngx_http_var_variable_t *var);
static ngx_int_t ngx_http_var_do_max(ngx_http_request_t *r,
ngx_http_variable_value_t *v, ngx_http_var_variable_t *var);
static ngx_int_t ngx_http_var_do_min(ngx_http_request_t *r,
ngx_http_variable_value_t *v, ngx_http_var_variable_t *var);
static ngx_int_t ngx_http_var_do_add(ngx_http_request_t *r,
ngx_http_variable_value_t *v, ngx_http_var_variable_t *var);
static ngx_int_t ngx_http_var_do_sub(ngx_http_request_t *r,
ngx_http_variable_value_t *v, ngx_http_var_variable_t *var);
static ngx_int_t ngx_http_var_do_mul(ngx_http_request_t *r,
ngx_http_variable_value_t *v, ngx_http_var_variable_t *var);
static ngx_int_t ngx_http_var_do_div(ngx_http_request_t *r,
ngx_http_variable_value_t *v, ngx_http_var_variable_t *var);
static ngx_int_t ngx_http_var_do_mod(ngx_http_request_t *r,
ngx_http_variable_value_t *v, ngx_http_var_variable_t *var);
static ngx_int_t ngx_http_var_do_round(ngx_http_request_t *r,
ngx_http_variable_value_t *v, ngx_http_var_variable_t *var);
static ngx_int_t ngx_http_var_do_floor(ngx_http_request_t *r,
ngx_http_variable_value_t *v, ngx_http_var_variable_t *var);
static ngx_int_t ngx_http_var_do_ceil(ngx_http_request_t *r,
ngx_http_variable_value_t *v, ngx_http_var_variable_t *var);
static ngx_int_t ngx_http_var_do_rand(ngx_http_request_t *r,
ngx_http_variable_value_t *v, ngx_http_var_variable_t *var);
static ngx_int_t ngx_http_var_do_rand_range(ngx_http_request_t *r,
ngx_http_variable_value_t *v, ngx_http_var_variable_t *var);
static ngx_int_t ngx_http_var_do_hex_encode(ngx_http_request_t *r,
ngx_http_variable_value_t *v, ngx_http_var_variable_t *var);
static ngx_int_t ngx_http_var_do_hex_decode(ngx_http_request_t *r,
ngx_http_variable_value_t *v, ngx_http_var_variable_t *var);
static ngx_int_t ngx_http_var_do_dec_to_hex(ngx_http_request_t *r,
ngx_http_variable_value_t *v, ngx_http_var_variable_t *var);
static ngx_int_t ngx_http_var_do_hex_to_dec(ngx_http_request_t *r,
ngx_http_variable_value_t *v, ngx_http_var_variable_t *var);
static ngx_int_t ngx_http_var_do_escape_uri(ngx_http_request_t *r,
ngx_http_variable_value_t *v, ngx_http_var_variable_t *var);
static ngx_int_t ngx_http_var_do_escape_args(ngx_http_request_t *r,
ngx_http_variable_value_t *v, ngx_http_var_variable_t *var);
static ngx_int_t ngx_http_var_do_escape_uri_component(
ngx_http_request_t *r, ngx_http_variable_value_t *v,
ngx_http_var_variable_t *var);
static ngx_int_t ngx_http_var_do_escape_html(
ngx_http_request_t *r, ngx_http_variable_value_t *v,
ngx_http_var_variable_t *var);
static ngx_int_t ngx_http_var_do_unescape_uri(ngx_http_request_t *r,
ngx_http_variable_value_t *v, ngx_http_var_variable_t *var);
static ngx_int_t ngx_http_var_do_base64_encode(ngx_http_request_t *r,
ngx_http_variable_value_t *v, ngx_http_var_variable_t *var);
static ngx_int_t ngx_http_var_do_base64url_encode(ngx_http_request_t *r,
ngx_http_variable_value_t *v, ngx_http_var_variable_t *var);
static ngx_int_t ngx_http_var_do_base64_decode(ngx_http_request_t *r,
ngx_http_variable_value_t *v, ngx_http_var_variable_t *var);
static ngx_int_t ngx_http_var_do_base64url_decode(ngx_http_request_t *r,
ngx_http_variable_value_t *v, ngx_http_var_variable_t *var);
static ngx_int_t ngx_http_var_do_crc32_short(ngx_http_request_t *r,
ngx_http_variable_value_t *v, ngx_http_var_variable_t *var);
static ngx_int_t ngx_http_var_do_crc32_long(ngx_http_request_t *r,
ngx_http_variable_value_t *v, ngx_http_var_variable_t *var);
static ngx_int_t ngx_http_var_do_md5sum(ngx_http_request_t *r,
ngx_http_variable_value_t *v, ngx_http_var_variable_t *var);
static ngx_int_t ngx_http_var_do_sha1sum(ngx_http_request_t *r,
ngx_http_variable_value_t *v, ngx_http_var_variable_t *var);
#if (NGX_HTTP_SSL)
static ngx_int_t ngx_http_var_do_sha256sum(ngx_http_request_t *r,
ngx_http_variable_value_t *v, ngx_http_var_variable_t *var);
static ngx_int_t ngx_http_var_do_sha384sum(ngx_http_request_t *r,
ngx_http_variable_value_t *v, ngx_http_var_variable_t *var);
static ngx_int_t ngx_http_var_do_sha512sum(ngx_http_request_t *r,
ngx_http_variable_value_t *v, ngx_http_var_variable_t *var);
static ngx_int_t ngx_http_var_do_hmac_sha1(ngx_http_request_t *r,
ngx_http_variable_value_t *v, ngx_http_var_variable_t *var);
static ngx_int_t ngx_http_var_do_hmac_sha256(ngx_http_request_t *r,
ngx_http_variable_value_t *v, ngx_http_var_variable_t *var);
static ngx_int_t ngx_http_var_do_hmac_sha384(ngx_http_request_t *r,
ngx_http_variable_value_t *v, ngx_http_var_variable_t *var);
static ngx_int_t ngx_http_var_do_hmac_sha512(ngx_http_request_t *r,
ngx_http_variable_value_t *v, ngx_http_var_variable_t *var);
#endif
static ngx_int_t ngx_http_var_do_if_time_range(ngx_http_request_t *r,
ngx_http_variable_value_t *v, ngx_http_var_variable_t *var);
static ngx_int_t ngx_http_var_do_gmt_time(ngx_http_request_t *r,
ngx_http_variable_value_t *v, ngx_http_var_variable_t *var);
static ngx_int_t ngx_http_var_do_local_time(ngx_http_request_t *r,
ngx_http_variable_value_t *v, ngx_http_var_variable_t *var);
static ngx_int_t ngx_http_var_do_unix_time(ngx_http_request_t *r,
ngx_http_variable_value_t *v, ngx_http_var_variable_t *var);
static ngx_int_t ngx_http_var_do_if_ip_range(ngx_http_request_t *r,
ngx_http_variable_value_t *v, ngx_http_var_variable_t *var);
static ngx_command_t ngx_http_var_commands[] = {
{ ngx_string("var"),
NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_2MORE,
ngx_http_var_create_variable,
NGX_HTTP_LOC_CONF_OFFSET,
0,
NULL },
ngx_null_command
};
static ngx_http_module_t ngx_http_var_module_ctx = {
NULL, /* preconfiguration */
NULL, /* postconfiguration */
ngx_http_var_create_conf, /* create main configuration */
NULL, /* init main configuration */
ngx_http_var_create_conf, /* create server configuration */
ngx_http_var_merge_conf, /* merge server configuration */
ngx_http_var_create_conf, /* create location configuration */
ngx_http_var_merge_conf /* merge location configuration */
};
ngx_module_t ngx_http_var_module = {
NGX_MODULE_V1,
&ngx_http_var_module_ctx, /* module context */
ngx_http_var_commands, /* module directives */
NGX_HTTP_MODULE, /* module type */
NULL, /* init master */
NULL, /* init module */
NULL, /* init process */
NULL, /* init thread */
NULL, /* exit thread */
NULL, /* exit process */
NULL, /* exit master */
NGX_MODULE_V1_PADDING
};
/* Create configuration */
static void *
ngx_http_var_create_conf(ngx_conf_t *cf)
{
ngx_http_var_conf_t *conf;
conf = ngx_pcalloc(cf->pool, sizeof(ngx_http_var_conf_t));
if (conf == NULL) {
return NULL;
}
conf->vars = NULL;
return conf;
}
/* Merge configurations */
static char *
ngx_http_var_merge_conf(ngx_conf_t *cf, void *parent, void *child)
{
ngx_http_var_conf_t *prev = parent;
ngx_http_var_conf_t *conf = child;
ngx_http_var_variable_t *var;
if (conf->vars == NULL) {
conf->vars = prev->vars;
} else if (prev->vars) {
var = ngx_array_push_n(conf->vars, prev->vars->nelts);
if (var == NULL) {
return NGX_CONF_ERROR;
}
ngx_memcpy(var, prev->vars->elts,
prev->vars->nelts * sizeof(ngx_http_var_variable_t));
}
return NGX_CONF_OK;
}
/* "var" directive handler */
static char *
ngx_http_var_create_variable(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
{
ngx_http_var_conf_t *vconf = conf;
ngx_str_t *value;
ngx_uint_t cur, last;
ngx_str_t var_name, op_name;
ngx_str_t s;
ngx_http_variable_t *v;
ngx_http_var_variable_t *var;
ngx_uint_t flags;
ngx_uint_t i, n;
ngx_http_var_operator_e op;
ngx_uint_t ignore_case, min_args, max_args;
ngx_uint_t args_count;
size_t ops_count;
ngx_http_complex_value_t *filter;
ngx_uint_t negative;
#if (NGX_PCRE)
ngx_regex_compile_t rc;
u_char errstr[NGX_MAX_CONF_ERRSTR];
ngx_str_t regex;
size_t regex_len;
#endif
ngx_http_complex_value_t *cv;
ngx_http_compile_complex_value_t ccv;
op = NGX_HTTP_VAR_OP_UNKNOWN;
ignore_case = 0;
filter = NULL;
negative = 0;
value = cf->args->elts;
last = cf->args->nelts - 1;
if (cf->args->nelts < 3) {
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
"http var: invalid number of arguments "
"in \"var\" directive");
return NGX_CONF_ERROR;
}
var_name = value[1];
op_name = value[2];
if (var_name.len == 0 || var_name.data[0] != '$') {
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
"http var: invalid variable name \"%V\"",
&var_name);
return NGX_CONF_ERROR;
}
/* Remove the leading '$' from variable name */
var_name.len--;
var_name.data++;
/* Map operator string to enum and get argument counts */
ops_count = sizeof(ngx_http_var_operators) /
sizeof(ngx_http_var_operator_enum_t);
for (i = 0; i < ops_count; i++) {
if (op_name.len == ngx_http_var_operators[i].name.len
&& ngx_strncmp(op_name.data,
ngx_http_var_operators[i].name.data, op_name.len) == 0)
{
op = ngx_http_var_operators[i].op;
min_args = ngx_http_var_operators[i].min_args;
max_args = ngx_http_var_operators[i].max_args;
break;
}
}
if (op == NGX_HTTP_VAR_OP_UNKNOWN) {
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
"http var: unsupported operator \"%V\"",
&op_name);
return NGX_CONF_ERROR;
}
if (cf->args->nelts > 3 && (ngx_strncmp(value[last].data, "if=", 3) == 0
|| ngx_strncmp(value[last].data, "if!=", 4) == 0))
{
if (ngx_strncmp(value[last].data, "if=", 3) == 0) {
s.len = value[last].len - 3;
s.data = value[last].data + 3;
negative = 0;
} else {
s.len = value[last].len - 4;
s.data = value[last].data + 4;
negative = 1;
}
ngx_memzero(&ccv, sizeof(ngx_http_compile_complex_value_t));
ccv.cf = cf;
ccv.value = &s;
ccv.complex_value = ngx_palloc(cf->pool,
sizeof(ngx_http_complex_value_t));
if (ccv.complex_value == NULL) {
return NGX_CONF_ERROR;
}
if (ngx_http_compile_complex_value(&ccv) != NGX_OK) {
return NGX_CONF_ERROR;
}
filter = ccv.complex_value;
args_count = cf->args->nelts - 4;
last--;
} else {
args_count = cf->args->nelts - 3;
}
cur = 3;
if (cur <= last && value[cur].len == 2
&& value[cur].data[0] == '-' && value[cur].data[1] == 'i')
{
ignore_case = 1;
args_count--;
cur++;
}
if (args_count < min_args || args_count > max_args) {
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
"http var: invalid number of arguments "
"for operator \"%V\"", &op_name);
return NGX_CONF_ERROR;
}
/* Initialize vars array if necessary */
if (vconf->vars == NULL) {
vconf->vars = ngx_array_create(cf->pool, 4,
sizeof(ngx_http_var_variable_t));
if (vconf->vars == NULL) {
return NGX_CONF_ERROR;
}
}
/* Add variable definition */
var = ngx_array_push(vconf->vars);
if (var == NULL) {
return NGX_CONF_ERROR;
}
var->name.len = var_name.len;
var->name.data = ngx_pstrdup(cf->pool, &var_name);
if (var->name.data == NULL) {
return NGX_CONF_ERROR;
}
var->operator = op;
var->ignore_case = ignore_case;
var->filter = filter;
var->negative = negative;
#if (NGX_PCRE)
if (op == NGX_HTTP_VAR_OP_IF_RE_MATCH
|| op == NGX_HTTP_VAR_OP_RE_CAPTURE
|| op == NGX_HTTP_VAR_OP_RE_SUB
|| op == NGX_HTTP_VAR_OP_RE_GSUB)
{
if (args_count < 2) {
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
"http var: regex operators "
"requires at least 2 arguments");
return NGX_CONF_ERROR;
}
args_count--;
/* Compile src_string (complex variable) */
var->args = ngx_array_create(cf->pool, args_count ? args_count : 1,
sizeof(ngx_http_complex_value_t));
if (var->args == NULL) {
return NGX_CONF_ERROR;
}
cv = ngx_array_push(var->args);
if (cv == NULL) {
return NGX_CONF_ERROR;
}
ngx_memzero(&ccv, sizeof(ngx_http_compile_complex_value_t));
ccv.cf = cf;
ccv.value = &value[cur];
ccv.complex_value = cv;
if (ngx_http_compile_complex_value(&ccv) != NGX_OK) {
return NGX_CONF_ERROR;
}
cur++;
/* Compile regex pattern */
if (op == NGX_HTTP_VAR_OP_RE_SUB) {
regex_len = value[cur].len + 2;
regex.data = ngx_pnalloc(cf->pool, regex_len);
if (regex.data == NULL) {
return NGX_CONF_ERROR;
}
ngx_memcpy(regex.data, value[cur].data, value[cur].len);
ngx_memcpy(regex.data + value[cur].len, "()", 2);
regex.len = regex_len;
} else {
regex = value[cur];
}
ngx_memzero(&rc, sizeof(ngx_regex_compile_t));
rc.pattern = regex;
rc.pool = cf->pool;
rc.err.len = NGX_MAX_CONF_ERRSTR;
rc.err.data = errstr;
if (ignore_case == 1) {
rc.options = NGX_REGEX_CASELESS;
}
var->regex = ngx_http_regex_compile(cf, &rc);
if (var->regex == NULL) {
return NGX_CONF_ERROR;
}
cur++;
/* Compile assign_value */
if (op != NGX_HTTP_VAR_OP_IF_RE_MATCH) {
if (args_count != 2) {
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
"http var: regex capture and sub "
"operators requires 3 arguments");
return NGX_CONF_ERROR;
}
cv = ngx_array_push(var->args);
if (cv == NULL) {
return NGX_CONF_ERROR;
}
ngx_memzero(&ccv, sizeof(ngx_http_compile_complex_value_t));
ccv.cf = cf;
ccv.value = &value[cur];
ccv.complex_value = cv;
if (ngx_http_compile_complex_value(&ccv) != NGX_OK) {
return NGX_CONF_ERROR;
}
}
} else {
#endif
/* Initialize args array */
var->args = ngx_array_create(cf->pool, args_count ? args_count : 1,
sizeof(ngx_http_complex_value_t));
if (var->args == NULL) {
return NGX_CONF_ERROR;
}
/* Compile all arguments */
for (n = 0; n < args_count; n++) {
cv = ngx_array_push(var->args);
if (cv == NULL) {
return NGX_CONF_ERROR;
}
ngx_memzero(&ccv, sizeof(ngx_http_compile_complex_value_t));
ccv.cf = cf;
ccv.value = &value[cur + n];
ccv.complex_value = cv;
if (ngx_http_compile_complex_value(&ccv) != NGX_OK) {
return NGX_CONF_ERROR;
}
}
#if (NGX_PCRE)
}
#endif
/* Add variable to Nginx */
flags = NGX_HTTP_VAR_CHANGEABLE | NGX_HTTP_VAR_NOCACHEABLE;
v = ngx_http_add_variable(cf, &var_name, flags);
if (v == NULL) {
return NGX_CONF_ERROR;
}
if (v->get_handler && v->get_handler != ngx_http_var_variable_handler) {
ngx_conf_log_error(NGX_LOG_WARN, cf, 0,
"http var: variable $%V already has a handler",
&var_name);
return NGX_CONF_ERROR;
}
/* Set variable name and handler */
v->get_handler = ngx_http_var_variable_handler;
v->data = (uintptr_t) &var->name;
return NGX_CONF_OK;
}
static ngx_http_var_ctx_t *
ngx_http_var_get_lock_ctx(ngx_http_request_t *r)
{
ngx_http_var_ctx_t *ctx;
/* Attempt to get the current request context */
ctx = ngx_http_get_module_ctx(r, ngx_http_var_module);
/* If the context does not exist, create and attach it to the request */
if (ctx == NULL) {
ctx = ngx_pcalloc(r->pool, sizeof(ngx_http_var_ctx_t));
if (ctx == NULL) {
ngx_log_error(NGX_LOG_ERR, r->connection->log, 0,
"http var: failed to create lock context");
return NULL;
}
/* Initialize the variable lock array, assuming a maximum number of variables */
ctx->count = 128; /* Set initial variable count to 128 */
ctx->locked_vars = ngx_pcalloc(r->pool,
ctx->count * sizeof(ngx_uint_t));
if (ctx->locked_vars == NULL) {
return NULL;
}
ngx_http_set_ctx(r, ctx, ngx_http_var_module);
}
return ctx;
}
static ngx_int_t
ngx_http_variable_acquire_lock(ngx_http_request_t *r, ngx_str_t *var_name)
{
ngx_http_var_ctx_t *ctx;
ngx_uint_t var_index;
ngx_uint_t new_count;
ngx_uint_t *new_locked_vars;
/* Get or create the context */
ctx = ngx_http_var_get_lock_ctx(r);
if (ctx == NULL) {
return NGX_ERROR; /* Context creation failed */
}
/* Calculate the variable index */
var_index = ngx_hash_key(var_name->data, var_name->len) % ctx->count;
/* Dynamically expand the lock array */
if (var_index >= ctx->count) {
new_count = ctx->count * 2;
new_locked_vars = ngx_pcalloc(r->pool,
new_count * sizeof(ngx_uint_t));
if (new_locked_vars == NULL) {
ngx_log_error(NGX_LOG_ERR, r->connection->log, 0,
"http var: failed to expand lock array");
return NGX_ERROR;
}
ngx_memcpy(new_locked_vars, ctx->locked_vars,
ctx->count * sizeof(ngx_uint_t));
ctx->locked_vars = new_locked_vars;
ctx->count = new_count;
}
/* Check if it is already locked */
if (ctx->locked_vars[var_index]) {
ngx_log_error(NGX_LOG_ERR, r->connection->log, 0,
"http var: circular reference detected "
"for variable $%V", var_name);
return NGX_ERROR;
}
/* Mark the variable as locked */
ctx->locked_vars[var_index] = 1;
return NGX_OK;
}
static void
ngx_http_variable_release_lock(ngx_http_request_t *r, ngx_str_t *var_name)
{
ngx_http_var_ctx_t *ctx;
ngx_uint_t var_index;
/* Get the current request context */
ctx = ngx_http_get_module_ctx(r, ngx_http_var_module);
if (ctx == NULL) {
return;
}
/* Calculate the variable index */
var_index = ngx_hash_key(var_name->data, var_name->len) % ctx->count;
/* Clear the lock mark */
ctx->locked_vars[var_index] = 0;
}
/* Helper function to find variable */
static ngx_int_t
ngx_http_var_find_variable(ngx_http_request_t *r,
ngx_str_t *var_name, ngx_http_var_conf_t *vconf,
ngx_http_var_variable_t **found_var)
{
ngx_http_var_variable_t *vars;
ngx_uint_t i;
ngx_str_t val;
if (vconf == NULL || vconf->vars == NULL || vconf->vars->nelts == 0) {
ngx_log_debug0(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
"http var: not variable defined by http var module");
return NGX_DECLINED;
}
ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
"http var: searching variable $%V in var module config",
var_name);
vars = vconf->vars->elts;
/* Linear search */
for (i = 0; i < vconf->vars->nelts; i++) {
if (vars[i].name.len == var_name->len
&& ngx_strncmp(vars[i].name.data,
var_name->data, var_name->len) == 0) {
if (vars[i].filter) {
if (ngx_http_complex_value(r, vars[i].filter, &val)
!= NGX_OK) {
return NGX_ERROR;
}
if (val.len == 0 || (val.len == 1 && val.data[0] == '0')) {
if (!vars[i].negative) {
continue;
}
} else {
if (vars[i].negative) {