/*
* Copyright (C) Igor Sysoev
* Copyright (C) Nginx, Inc.
*/
#include <ngx_config.h>
#include <ngx_core.h>
#include <ngx_http.h>
/*
* The module can check browser versions conforming to the following formats:
* X, X.X, X.X.X, and X.X.X.X. The maximum values of each format may be
* 4000, 4000.99, 4000.99.99, and 4000.99.99.99.
*/
#define NGX_HTTP_MODERN_BROWSER 0
#define NGX_HTTP_ANCIENT_BROWSER 1
typedef struct {
u_char browser[12];
size_t skip;
size_t add;
u_char name[12];
} ngx_http_modern_browser_mask_t;
typedef struct {
ngx_uint_t version;
size_t skip;
size_t add;
u_char name[12];
} ngx_http_modern_browser_t;
typedef struct {
ngx_str_t name;
ngx_http_get_variable_pt handler;
uintptr_t data;
} ngx_http_browser_variable_t;
typedef struct {
ngx_array_t *modern_browsers;
ngx_array_t *ancient_browsers;
ngx_http_variable_value_t *modern_browser_value;
ngx_http_variable_value_t *ancient_browser_value;
unsigned modern_unlisted_browsers:1;
unsigned netscape4:1;
} ngx_http_browser_conf_t;
static ngx_int_t ngx_http_msie_variable(ngx_http_request_t *r,
ngx_http_variable_value_t *v, uintptr_t data);
static ngx_int_t ngx_http_browser_variable(ngx_http_request_t *r,
ngx_http_variable_value_t *v, uintptr_t data);
static ngx_uint_t ngx_http_browser(ngx_http_request_t *r,
ngx_http_browser_conf_t *cf);
static ngx_int_t ngx_http_browser_add_variable(ngx_conf_t *cf);
static void *ngx_http_browser_create_conf(ngx_conf_t *cf);
static char *ngx_http_browser_merge_conf(ngx_conf_t *cf, void *parent,
void *child);
static int ngx_libc_cdecl ngx_http_modern_browser_sort(const void *one,
const void *two);
static char *ngx_http_modern_browser(ngx_conf_t *cf, ngx_command_t *cmd,
void *conf);
static char *ngx_http_ancient_browser(ngx_conf_t *cf, ngx_command_t *cmd,
void *conf);
static char *ngx_http_modern_browser_value(ngx_conf_t *cf, ngx_command_t *cmd,
void *conf);
static char *ngx_http_ancient_browser_value(ngx_conf_t *cf, ngx_command_t *cmd,
void *conf);
static ngx_command_t ngx_http_browser_commands[] = {
{ ngx_string("modern_browser"),
NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE12,
ngx_http_modern_browser,
NGX_HTTP_LOC_CONF_OFFSET,
0,
NULL },
{ ngx_string("ancient_browser"),
NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_1MORE,
ngx_http_ancient_browser,
NGX_HTTP_LOC_CONF_OFFSET,
0,
NULL },
{ ngx_string("modern_browser_value"),
NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1,
ngx_http_modern_browser_value,
NGX_HTTP_LOC_CONF_OFFSET,
0,
NULL },
{ ngx_string("ancient_browser_value"),
NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1,
ngx_http_ancient_browser_value,
NGX_HTTP_LOC_CONF_OFFSET,
0,
NULL },
ngx_null_command
};
static ngx_http_module_t ngx_http_browser_module_ctx = {
ngx_http_browser_add_variable, /* preconfiguration */
NULL, /* postconfiguration */
NULL, /* create main configuration */
NULL, /* init main configuration */
NULL, /* create server configuration */
NULL, /* merge server configuration */
ngx_http_browser_create_conf, /* create location configuration */
ngx_http_browser_merge_conf /* merge location configuration */
};
ngx_module_t ngx_http_browser_module = {
NGX_MODULE_V1,
&ngx_http_browser_module_ctx, /* module context */
ngx_http_browser_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
};
static ngx_http_modern_browser_mask_t ngx_http_modern_browser_masks[] = {
/* Opera must be the first browser to check */
/*
* "Opera/7.50 (X11; FreeBSD i386; U) [en]"
* "Mozilla/5.0 (X11; FreeBSD i386; U) Opera 7.50 [en]"
* "Mozilla/4.0 (compatible; MSIE 6.0; X11; FreeBSD i386) Opera 7.50 [en]"
* "Opera/8.0 (Windows NT 5.1; U; ru)"
* "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.0; en) Opera 8.0"
* "Opera/9.01 (X11; FreeBSD 6 i386; U; en)"
*/
{ "opera",
0,
sizeof("Opera ") - 1,
"Opera"},
/* "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1)" */
{ "msie",
sizeof("Mozilla/4.0 (compatible; ") - 1,
sizeof("MSIE ") - 1,
"MSIE "},
/*
* "Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.0.0) Gecko/20020610"
* "Mozilla/5.0 (Windows; U; Windows NT 5.1; ru-RU; rv:1.5) Gecko/20031006"
* "Mozilla/5.0 (Windows; U; Windows NT 5.1; ru-RU; rv:1.6) Gecko/20040206
* Firefox/0.8"
* "Mozilla/5.0 (Windows; U; Windows NT 5.1; ru-RU; rv:1.7.8)
* Gecko/20050511 Firefox/1.0.4"
* "Mozilla/5.0 (X11; U; FreeBSD i386; en-US; rv:1.8.0.5) Gecko/20060729
* Firefox/1.5.0.5"
*/
{ "gecko",
sizeof("Mozilla/5.0 (") - 1,
sizeof("rv:") - 1,
"rv:"},
/*
* "Mozilla/5.0 (Macintosh; U; PPC Mac OS X; ru-ru) AppleWebKit/125.2
* (KHTML, like Gecko) Safari/125.7"
* "Mozilla/5.0 (SymbianOS/9.1; U; en-us) AppleWebKit/413
* (KHTML, like Gecko) Safari/413"
* "Mozilla/5.0 (Macintosh; U; PPC Mac OS X; en) AppleWebKit/418
* (KHTML, like Gecko) Safari/417.9.3"
* "Mozilla/5.0 (Macintosh; U; PPC Mac OS X; ru-ru) AppleWebKit/418.8
* (KHTML, like Gecko) Safari/419.3"
*/
{ "safari",
sizeof("Mozilla/5.0 (") - 1,
sizeof("Safari/") - 1,
"Safari/"},
/*
* "Mozilla/5.0 (compatible; Konqueror/3.1; Linux)"
* "Mozilla/5.0 (compatible; Konqueror/3.4; Linux) KHTML/3.4.2 (like Gecko)"
* "Mozilla/5.0 (compatible; Konqueror/3.5; FreeBSD) KHTML/3.5.1
* (like Gecko)"
*/
{ "konqueror",
sizeof("Mozilla/5.0 (compatible; ") - 1,
sizeof("Konqueror/") - 1,
"Konqueror/"},
{ "", 0, 0, "" }
};
static ngx_http_browser_variable_t ngx_http_browsers[] = {
{ ngx_string("msie"), ngx_http_msie_variable, 0 },
{ ngx_string("modern_browser"), ngx_http_browser_variable,
NGX_HTTP_MODERN_BROWSER },
{ ngx_string("ancient_browser"), ngx_http_browser_variable,
NGX_HTTP_ANCIENT_BROWSER },
{ ngx_null_string, NULL, 0 }
};
static ngx_int_t
ngx_http_browser_variable(ngx_http_request_t *r, ngx_http_variable_value_t *v,
uintptr_t data)
{
ngx_uint_t rc;
ngx_http_browser_conf_t *cf;
cf = ngx_http_get_module_loc_conf(r, ngx_http_browser_module);
rc = ngx_http_browser(r, cf);
if (data == NGX_HTTP_MODERN_BROWSER && rc == NGX_HTTP_MODERN_BROWSER) {
*v = *cf->modern_browser_value;
return NGX_OK;
}
if (data == NGX_HTTP_ANCIENT_BROWSER && rc == NGX_HTTP_ANCIENT_BROWSER) {
*v = *cf->ancient_browser_value;
return NGX_OK;
}
*v = ngx_http_variable_null_value;
return NGX_OK;
}
static ngx_uint_t
ngx_http_browser(ngx_http_request_t *r, ngx_http_browser_conf_t *cf)
{
size_t len;
u_char *name, *ua, *last, c;
ngx_str_t *ancient;
ngx_uint_t i, version, ver, scale;
ngx_http_modern_browser_t *modern;
if (r->headers_in.user_agent == NULL) {
if (cf->modern_unlisted_browsers) {
return NGX_HTTP_MODERN_BROWSER;
}
return NGX_HTTP_ANCIENT_BROWSER;
}
ua = r->headers_in.user_agent->value.data;
len = r->headers_in.user_agent->value.len;
last = ua + len;
if (cf->modern_browsers) {
modern = cf->modern_browsers->elts;
for (i = 0; i < cf->modern_browsers->nelts; i++) {
name = ua + modern[i].skip;
if (name >= last) {
continue;
}
name = (u_char *) ngx_strstr(name, modern[i].name);
if (name == NULL) {
continue;
}
ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
"browser: \"%s\"", name);
name += modern[i].add;
if (name >= last) {
continue;
}
ngx_log_debug2(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
"version: \"%ui\" \"%s\"", modern[i].version, name);
version = 0;
ver = 0;
scale = 1000000;
while (name < last) {
c = *name++;
if (c >= '0' && c <= '9') {
ver = ver * 10 + (c - '0');
continue;
}
if (c == '.') {
version += ver * scale;
ngx_log_debug2(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
"version: \"%ui\" \"%ui\"",
modern[i].version, version);
if (version > modern[i].version) {
return NGX_HTTP_MODERN_BROWSER;
}
ver = 0;
scale /= 100;
continue;
}
break;
}
version += ver * scale;
ngx_log_debug2(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
"version: \"%ui\" \"%ui\"",
modern[i].version, version);
if (version >= modern[i].version) {
return NGX_HTTP_MODERN_BROWSER;
}
return NGX_HTTP_ANCIENT_BROWSER;
}
if (!cf->modern_unlisted_browsers) {
return NGX_HTTP_ANCIENT_BROWSER;
}
}
if (cf->netscape4) {
if (len > sizeof("Mozilla/4.72 ") - 1
&& ngx_strncmp(ua, "Mozilla/", sizeof("Mozilla/") - 1) == 0
&& ua[8] > '0' && ua[8] < '5')
{
return NGX_HTTP_ANCIENT_BROWSER;
}
}
if (cf->ancient_browsers) {
ancient = cf->ancient_browsers->elts;
for (i = 0; i < cf->ancient_browsers->nelts; i++) {
if (len >= ancient[i].len
&& ngx_strstr(ua, ancient[i].data) != NULL)
{
return NGX_HTTP_ANCIENT_BROWSER;
}
}
}
if (cf->modern_unlisted_browsers) {
return NGX_HTTP_MODERN_BROWSER;
}
return NGX_HTTP_ANCIENT_BROWSER;
}
static ngx_int_t
ngx_http_msie_variable(ngx_http_request_t *r, ngx_http_variable_value_t *v,
uintptr_t data)
{
if (r->headers_in.msie) {
*v = ngx_http_variable_true_value;
return NGX_OK;
}
*v = ngx_http_variable_null_value;
return NGX_OK;
}
static ngx_int_t
ngx_http_browser_add_variable(ngx_conf_t *cf)
{
ngx_http_browser_variable_t *var;
ngx_http_variable_t *v;
for (var = ngx_http_browsers; var->name.len; var++) {
v = ngx_http_add_variable(cf, &var->name, NGX_HTTP_VAR_CHANGEABLE);
if (v == NULL) {
return NGX_ERROR;
}
v->get_handler = var->handler;
v->data = var->data;
}
return NGX_OK;
}
static void *
ngx_http_browser_create_conf(ngx_conf_t *cf)
{
ngx_http_browser_conf_t *conf;
conf = ngx_pcalloc(cf->pool, sizeof(ngx_http_browser_conf_t));
if (conf == NULL) {
return NULL;
}
/*
* set by ngx_pcalloc():
*
* conf->modern_browsers = NULL;
* conf->ancient_browsers = NULL;
* conf->modern_browser_value = NULL;
* conf->ancient_browser_value = NULL;
*
* conf->modern_unlisted_browsers = 0;
* conf->netscape4 = 0;
*/
return conf;
}
static char *
ngx_http_browser_merge_conf(ngx_conf_t *cf, void *parent, void *child)
{
ngx_http_browser_conf_t *prev = parent;
ngx_http_browser_conf_t *conf = child;
ngx_uint_t i, n;
ngx_http_modern_browser_t *browsers, *opera;
/*
* At the merge the skip field is used to store the browser slot,
* it will be used in sorting and then will overwritten
* with a real skip value. The zero value means Opera.
*/
if (conf->modern_browsers == NULL && conf->modern_unlisted_browsers == 0) {
conf->modern_browsers = prev->modern_browsers;
conf->modern_unlisted_browsers = prev->modern_unlisted_browsers;
} else if (conf->modern_browsers != NULL) {
browsers = conf->modern_browsers->elts;
for (i = 0; i < conf->modern_browsers->nelts; i++) {
if (browsers[i].skip == 0) {
goto found;
}
}
/*
* Opera may contain MSIE string, so if Opera was not enumerated
* as modern browsers, then add it and set a unreachable version
*/
opera = ngx_array_push(conf->modern_browsers);
if (opera == NULL) {
return NGX_CONF_ERROR;
}
opera->skip = 0;
opera->version = 4001000000U;
browsers = conf->modern_browsers->elts;
found:
ngx_qsort(browsers, (size_t) conf->modern_browsers->nelts,
sizeof(ngx_http_modern_browser_t),
ngx_http_modern_browser_sort);
for (i = 0; i < conf->modern_browsers->nelts; i++) {
n = browsers[i].skip;
browsers[i].skip = ngx_http_modern_browser_masks[n].skip;
browsers[i].add = ngx_http_modern_browser_masks[n].add;
(void) ngx_cpystrn(browsers[i].name,
ngx_http_modern_browser_masks[n].name, 12);
}
}
if (conf->ancient_browsers == NULL && conf->netscape4 == 0) {
conf->ancient_browsers = prev->ancient_browsers;
conf->netscape4 = prev->netscape4;
}
if (conf->modern_browser_value == NULL) {
conf->modern_browser_value = prev->modern_browser_value;
}
if (conf->modern_browser_value == NULL) {
conf->modern_browser_value = &ngx_http_variable_true_value;
}
if (conf->ancient_browser_value == NULL) {
conf->ancient_browser_value = prev->ancient_browser_value;
}
if (conf->ancient_browser_value == NULL) {
conf->ancient_browser_value = &ngx_http_variable_true_value;
}
return NGX_CONF_OK;
}
static int ngx_libc_cdecl
ngx_http_modern_browser_sort(const void *one, const void *two)
{
ngx_http_modern_browser_t *first = (ngx_http_modern_browser_t *) one;
ngx_http_modern_browser_t *second = (ngx_http_modern_browser_t *) two;
return (first->skip - second->skip);
}
static char *
ngx_http_modern_browser(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
{
ngx_http_browser_conf_t *bcf = conf;
u_char c;
ngx_str_t *value;
ngx_uint_t i, n, version, ver, scale;
ngx_http_modern_browser_t *browser;
ngx_http_modern_browser_mask_t *mask;
value = cf->args->elts;
if (cf->args->nelts == 2) {
if (ngx_strcmp(value[1].data, "unlisted") == 0) {
bcf->modern_unlisted_browsers = 1;
return NGX_CONF_OK;
}
return NGX_CONF_ERROR;
}
if (bcf->modern_browsers == NULL) {
bcf->modern_browsers = ngx_array_create(cf->pool, 5,
sizeof(ngx_http_modern_browser_t));
if (bcf->modern_browsers == NULL) {
return NGX_CONF_ERROR;
}
}
browser = ngx_array_push(bcf->modern_browsers);
if (browser == NULL) {
return NGX_CONF_ERROR;
}
mask = ngx_http_modern_browser_masks;
for (n = 0; mask[n].browser[0] != '\0'; n++) {
if (ngx_strcasecmp(mask[n].browser, value[1].data) == 0) {
goto found;
}
}
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
"unknown browser name \"%V\"", &value[1]);
return NGX_CONF_ERROR;
found:
/*
* at this stage the skip field is used to store the browser slot,
* it will be used in sorting in merge stage and then will overwritten
* with a real value
*/
browser->skip = n;
version = 0;
ver = 0;
scale = 1000000;
for (i = 0; i < value[2].len; i++) {
c = value[2].data[i];
if (c >= '0' && c <= '9') {
ver = ver * 10 + (c - '0');
continue;
}
if (c == '.') {
version += ver * scale;
ver = 0;
scale /= 100;
continue;
}
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
"invalid browser version \"%V\"", &value[2]);
return NGX_CONF_ERROR;
}
version += ver * scale;
browser->version = version;
return NGX_CONF_OK;
}
static char *
ngx_http_ancient_browser(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
{
ngx_http_browser_conf_t *bcf = conf;
ngx_str_t *value, *browser;
ngx_uint_t i;
value = cf->args->elts;
for (i = 1; i < cf->args->nelts; i++) {
if (ngx_strcmp(value[i].data, "netscape4") == 0) {
bcf->netscape4 = 1;
continue;
}
if (bcf->ancient_browsers == NULL) {
bcf->ancient_browsers = ngx_array_create(cf->pool, 4,
sizeof(ngx_str_t));
if (bcf->ancient_browsers == NULL) {
return NGX_CONF_ERROR;
}
}
browser = ngx_array_push(bcf->ancient_browsers);
if (browser == NULL) {
return NGX_CONF_ERROR;
}
*browser = value[i];
}
return NGX_CONF_OK;
}
static char *
ngx_http_modern_browser_value(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
{
ngx_http_browser_conf_t *bcf = conf;
ngx_str_t *value;
bcf->modern_browser_value = ngx_palloc(cf->pool,
sizeof(ngx_http_variable_value_t));
if (bcf->modern_browser_value == NULL) {
return NGX_CONF_ERROR;
}
value = cf->args->elts;
bcf->modern_browser_value->len = value[1].len;
bcf->modern_browser_value->valid = 1;
bcf->modern_browser_value->no_cacheable = 0;
bcf->modern_browser_value->not_found = 0;
bcf->modern_browser_value->data = value[1].data;
return NGX_CONF_OK;
}
static char *
ngx_http_ancient_browser_value(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
{
ngx_http_browser_conf_t *bcf = conf;
ngx_str_t *value;
bcf->ancient_browser_value = ngx_palloc(cf->pool,
sizeof(ngx_http_variable_value_t));
if (bcf->ancient_browser_value == NULL) {
return NGX_CONF_ERROR;
}
value = cf->args->elts;
bcf->ancient_browser_value->len = value[1].len;
bcf->ancient_browser_value->valid = 1;
bcf->ancient_browser_value->no_cacheable = 0;
bcf->ancient_browser_value->not_found = 0;
bcf->ancient_browser_value->data = value[1].data;
return NGX_CONF_OK;
}
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