nginx/src/core/ngx_regex.c

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/*
* Copyright (C) Igor Sysoev
2012-01-18 23:07:43 +08:00
* Copyright (C) Nginx, Inc.
*/
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#include <ngx_config.h>
#include <ngx_core.h>
typedef struct {
ngx_flag_t pcre_jit;
} ngx_regex_conf_t;
static void * ngx_libc_cdecl ngx_regex_malloc(size_t size);
static void ngx_libc_cdecl ngx_regex_free(void *p);
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static ngx_int_t ngx_regex_module_init(ngx_cycle_t *cycle);
static void *ngx_regex_create_conf(ngx_cycle_t *cycle);
static char *ngx_regex_init_conf(ngx_cycle_t *cycle, void *conf);
static char *ngx_regex_pcre_jit(ngx_conf_t *cf, void *post, void *data);
static ngx_conf_post_t ngx_regex_pcre_jit_post = { ngx_regex_pcre_jit };
static ngx_command_t ngx_regex_commands[] = {
{ ngx_string("pcre_jit"),
NGX_MAIN_CONF|NGX_DIRECT_CONF|NGX_CONF_TAKE1,
ngx_conf_set_flag_slot,
0,
offsetof(ngx_regex_conf_t, pcre_jit),
&ngx_regex_pcre_jit_post },
ngx_null_command
};
static ngx_core_module_t ngx_regex_module_ctx = {
ngx_string("regex"),
ngx_regex_create_conf,
ngx_regex_init_conf
};
ngx_module_t ngx_regex_module = {
NGX_MODULE_V1,
&ngx_regex_module_ctx, /* module context */
ngx_regex_commands, /* module directives */
NGX_CORE_MODULE, /* module type */
NULL, /* init master */
ngx_regex_module_init, /* init module */
NULL, /* init process */
NULL, /* init thread */
NULL, /* exit thread */
NULL, /* exit process */
NULL, /* exit master */
NGX_MODULE_V1_PADDING
};
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static ngx_pool_t *ngx_pcre_pool;
static ngx_list_t *ngx_pcre_studies;
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void
ngx_regex_init(void)
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{
pcre_malloc = ngx_regex_malloc;
pcre_free = ngx_regex_free;
}
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static ngx_inline void
ngx_regex_malloc_init(ngx_pool_t *pool)
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{
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#if (NGX_THREADS)
ngx_core_tls_t *tls;
if (ngx_threaded) {
tls = ngx_thread_get_tls(ngx_core_tls_key);
tls->pool = pool;
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return;
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}
#endif
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ngx_pcre_pool = pool;
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}
static ngx_inline void
ngx_regex_malloc_done(void)
{
#if (NGX_THREADS)
ngx_core_tls_t *tls;
if (ngx_threaded) {
tls = ngx_thread_get_tls(ngx_core_tls_key);
tls->pool = NULL;
return;
}
#endif
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ngx_pcre_pool = NULL;
}
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ngx_int_t
ngx_regex_compile(ngx_regex_compile_t *rc)
{
int n, erroff;
char *p;
pcre *re;
const char *errstr;
ngx_regex_elt_t *elt;
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ngx_regex_malloc_init(rc->pool);
re = pcre_compile((const char *) rc->pattern.data, (int) rc->options,
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&errstr, &erroff, NULL);
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/* ensure that there is no current pool */
ngx_regex_malloc_done();
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if (re == NULL) {
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if ((size_t) erroff == rc->pattern.len) {
rc->err.len = ngx_snprintf(rc->err.data, rc->err.len,
"pcre_compile() failed: %s in \"%V\"",
errstr, &rc->pattern)
- rc->err.data;
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} else {
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rc->err.len = ngx_snprintf(rc->err.data, rc->err.len,
"pcre_compile() failed: %s in \"%V\" at \"%s\"",
errstr, &rc->pattern, rc->pattern.data + erroff)
- rc->err.data;
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}
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return NGX_ERROR;
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}
rc->regex = ngx_pcalloc(rc->pool, sizeof(ngx_regex_t));
if (rc->regex == NULL) {
return NGX_ERROR;
}
rc->regex->pcre = re;
/* do not study at runtime */
if (ngx_pcre_studies != NULL) {
elt = ngx_list_push(ngx_pcre_studies);
if (elt == NULL) {
return NGX_ERROR;
}
elt->regex = rc->regex;
elt->name = rc->pattern.data;
}
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n = pcre_fullinfo(re, NULL, PCRE_INFO_CAPTURECOUNT, &rc->captures);
if (n < 0) {
p = "pcre_fullinfo(\"%V\", PCRE_INFO_CAPTURECOUNT) failed: %d";
goto failed;
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}
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if (rc->captures == 0) {
return NGX_OK;
}
n = pcre_fullinfo(re, NULL, PCRE_INFO_NAMECOUNT, &rc->named_captures);
if (n < 0) {
p = "pcre_fullinfo(\"%V\", PCRE_INFO_NAMECOUNT) failed: %d";
goto failed;
}
if (rc->named_captures == 0) {
return NGX_OK;
}
n = pcre_fullinfo(re, NULL, PCRE_INFO_NAMEENTRYSIZE, &rc->name_size);
if (n < 0) {
p = "pcre_fullinfo(\"%V\", PCRE_INFO_NAMEENTRYSIZE) failed: %d";
goto failed;
}
n = pcre_fullinfo(re, NULL, PCRE_INFO_NAMETABLE, &rc->names);
if (n < 0) {
p = "pcre_fullinfo(\"%V\", PCRE_INFO_NAMETABLE) failed: %d";
goto failed;
}
return NGX_OK;
failed:
rc->err.len = ngx_snprintf(rc->err.data, rc->err.len, p, &rc->pattern, n)
- rc->err.data;
return NGX_OK;
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}
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ngx_int_t
ngx_regex_exec_array(ngx_array_t *a, ngx_str_t *s, ngx_log_t *log)
{
ngx_int_t n;
ngx_uint_t i;
ngx_regex_elt_t *re;
re = a->elts;
for (i = 0; i < a->nelts; i++) {
n = ngx_regex_exec(re[i].regex, s, NULL, 0);
if (n == NGX_REGEX_NO_MATCHED) {
continue;
}
if (n < 0) {
ngx_log_error(NGX_LOG_ALERT, log, 0,
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ngx_regex_exec_n " failed: %i on \"%V\" using \"%s\"",
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n, s, re[i].name);
return NGX_ERROR;
}
/* match */
return NGX_OK;
}
return NGX_DECLINED;
}
static void * ngx_libc_cdecl
ngx_regex_malloc(size_t size)
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{
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ngx_pool_t *pool;
#if (NGX_THREADS)
ngx_core_tls_t *tls;
if (ngx_threaded) {
tls = ngx_thread_get_tls(ngx_core_tls_key);
pool = tls->pool;
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} else {
pool = ngx_pcre_pool;
}
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#else
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pool = ngx_pcre_pool;
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#endif
if (pool) {
return ngx_palloc(pool, size);
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}
return NULL;
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}
static void ngx_libc_cdecl
ngx_regex_free(void *p)
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{
return;
}
static ngx_int_t
ngx_regex_module_init(ngx_cycle_t *cycle)
{
int opt;
const char *errstr;
ngx_uint_t i;
ngx_list_part_t *part;
ngx_regex_elt_t *elts;
opt = 0;
#if (NGX_HAVE_PCRE_JIT)
{
ngx_regex_conf_t *rcf;
rcf = (ngx_regex_conf_t *) ngx_get_conf(cycle->conf_ctx, ngx_regex_module);
if (rcf->pcre_jit) {
opt = PCRE_STUDY_JIT_COMPILE;
}
}
#endif
ngx_regex_malloc_init(cycle->pool);
part = &ngx_pcre_studies->part;
elts = part->elts;
for (i = 0 ; /* void */ ; i++) {
if (i >= part->nelts) {
if (part->next == NULL) {
break;
}
part = part->next;
elts = part->elts;
i = 0;
}
elts[i].regex->extra = pcre_study(elts[i].regex->pcre, opt, &errstr);
if (errstr != NULL) {
ngx_log_error(NGX_LOG_ALERT, cycle->log, 0,
"pcre_study() failed: %s in \"%s\"",
errstr, elts[i].name);
}
#if (NGX_HAVE_PCRE_JIT)
if (opt & PCRE_STUDY_JIT_COMPILE) {
int jit, n;
jit = 0;
n = pcre_fullinfo(elts[i].regex->pcre, elts[i].regex->extra,
PCRE_INFO_JIT, &jit);
if (n != 0 || jit != 1) {
ngx_log_error(NGX_LOG_INFO, cycle->log, 0,
"JIT compiler does not support pattern: \"%s\"",
elts[i].name);
}
}
#endif
}
ngx_regex_malloc_done();
ngx_pcre_studies = NULL;
return NGX_OK;
}
static void *
ngx_regex_create_conf(ngx_cycle_t *cycle)
{
ngx_regex_conf_t *rcf;
rcf = ngx_pcalloc(cycle->pool, sizeof(ngx_regex_conf_t));
if (rcf == NULL) {
return NULL;
}
rcf->pcre_jit = NGX_CONF_UNSET;
ngx_pcre_studies = ngx_list_create(cycle->pool, 8, sizeof(ngx_regex_elt_t));
if (ngx_pcre_studies == NULL) {
return NULL;
}
return rcf;
}
static char *
ngx_regex_init_conf(ngx_cycle_t *cycle, void *conf)
{
ngx_regex_conf_t *rcf = conf;
ngx_conf_init_value(rcf->pcre_jit, 0);
return NGX_CONF_OK;
}
static char *
ngx_regex_pcre_jit(ngx_conf_t *cf, void *post, void *data)
{
ngx_flag_t *fp = data;
if (*fp == 0) {
return NGX_CONF_OK;
}
#if (NGX_HAVE_PCRE_JIT)
{
int jit, r;
jit = 0;
r = pcre_config(PCRE_CONFIG_JIT, &jit);
if (r != 0 || jit != 1) {
ngx_conf_log_error(NGX_LOG_WARN, cf, 0,
"PCRE library does not support JIT");
*fp = 0;
}
}
#else
ngx_conf_log_error(NGX_LOG_WARN, cf, 0,
"nginx was built without PCRE JIT support");
*fp = 0;
#endif
return NGX_CONF_OK;
}