diff options
Diffstat (limited to 'app/nginx/src/core/ngx_regex.c')
| -rw-r--r-- | app/nginx/src/core/ngx_regex.c | 435 |
1 files changed, 435 insertions, 0 deletions
diff --git a/app/nginx/src/core/ngx_regex.c b/app/nginx/src/core/ngx_regex.c new file mode 100644 index 0000000..9939dce --- /dev/null +++ b/app/nginx/src/core/ngx_regex.c @@ -0,0 +1,435 @@ + +/* + * Copyright (C) Igor Sysoev + * Copyright (C) Nginx, Inc. + */ + + +#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); +#if (NGX_HAVE_PCRE_JIT) +static void ngx_pcre_free_studies(void *data); +#endif + +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_FLAG, + 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 +}; + + +static ngx_pool_t *ngx_pcre_pool; +static ngx_list_t *ngx_pcre_studies; + + +void +ngx_regex_init(void) +{ + pcre_malloc = ngx_regex_malloc; + pcre_free = ngx_regex_free; +} + + +static ngx_inline void +ngx_regex_malloc_init(ngx_pool_t *pool) +{ + ngx_pcre_pool = pool; +} + + +static ngx_inline void +ngx_regex_malloc_done(void) +{ + ngx_pcre_pool = NULL; +} + + +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; + + ngx_regex_malloc_init(rc->pool); + + re = pcre_compile((const char *) rc->pattern.data, (int) rc->options, + &errstr, &erroff, NULL); + + /* ensure that there is no current pool */ + ngx_regex_malloc_done(); + + if (re == NULL) { + 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; + + } else { + 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; + } + + return NGX_ERROR; + } + + rc->regex = ngx_pcalloc(rc->pool, sizeof(ngx_regex_t)); + if (rc->regex == NULL) { + goto nomem; + } + + rc->regex->code = re; + + /* do not study at runtime */ + + if (ngx_pcre_studies != NULL) { + elt = ngx_list_push(ngx_pcre_studies); + if (elt == NULL) { + goto nomem; + } + + elt->regex = rc->regex; + elt->name = rc->pattern.data; + } + + n = pcre_fullinfo(re, NULL, PCRE_INFO_CAPTURECOUNT, &rc->captures); + if (n < 0) { + p = "pcre_fullinfo(\"%V\", PCRE_INFO_CAPTURECOUNT) failed: %d"; + goto failed; + } + + 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_ERROR; + +nomem: + + rc->err.len = ngx_snprintf(rc->err.data, rc->err.len, + "regex \"%V\" compilation failed: no memory", + &rc->pattern) + - rc->err.data; + return NGX_ERROR; +} + + +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, + ngx_regex_exec_n " failed: %i on \"%V\" using \"%s\"", + 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) +{ + ngx_pool_t *pool; + pool = ngx_pcre_pool; + + if (pool) { + return ngx_palloc(pool, size); + } + + return NULL; +} + + +static void ngx_libc_cdecl +ngx_regex_free(void *p) +{ + return; +} + + +#if (NGX_HAVE_PCRE_JIT) + +static void +ngx_pcre_free_studies(void *data) +{ + ngx_list_t *studies = data; + + ngx_uint_t i; + ngx_list_part_t *part; + ngx_regex_elt_t *elts; + + part = &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; + } + + if (elts[i].regex->extra != NULL) { + pcre_free_study(elts[i].regex->extra); + } + } +} + +#endif + + +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; + ngx_pool_cleanup_t *cln; + + rcf = (ngx_regex_conf_t *) ngx_get_conf(cycle->conf_ctx, ngx_regex_module); + + if (rcf->pcre_jit) { + opt = PCRE_STUDY_JIT_COMPILE; + + /* + * The PCRE JIT compiler uses mmap for its executable codes, so we + * have to explicitly call the pcre_free_study() function to free + * this memory. + */ + + cln = ngx_pool_cleanup_add(cycle->pool, 0); + if (cln == NULL) { + return NGX_ERROR; + } + + cln->handler = ngx_pcre_free_studies; + cln->data = ngx_pcre_studies; + } + } +#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->code, 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->code, 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; +} |