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* Copyright (c) 1996,1997 The Apache Group. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
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* software must display the following acknowledgment:
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* for use in the Apache HTTP server project (http://www.apache.org/)."
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*
* This software consists of voluntary contributions made by many
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* on public domain software written at the National Center for
* Supercomputing Applications, University of Illinois, Urbana-Champaign.
* For more information on the Apache Group and the Apache HTTP server
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*/
/*
* mod_browser.c
* Set environment variables based on browser support.
*
* Alexei Kosut <akosut@organic.com>
*/
#include "httpd.h"
#include "http_config.h"
typedef struct {
char *name;
regex_t *preg;
table *features;
} browser_entry;
typedef struct {
array_header *browsers;
} browser_server_config_rec;
module MODULE_VAR_EXPORT browser_module;
void *create_browser_config (pool *p, server_rec *dummy)
{
browser_server_config_rec *new =
(browser_server_config_rec *) palloc (p, sizeof(browser_server_config_rec));
new->browsers = make_array (p, 20, sizeof(browser_entry));
return (void *)new;
}
void *merge_browser_config (pool *p, void *basev, void *overridesv)
{
browser_server_config_rec *a =
pcalloc(p, sizeof(browser_server_config_rec));
browser_server_config_rec *base = basev, *overrides = overridesv;
a->browsers = append_arrays(p, base->browsers, overrides->browsers);
return a;
}
const char *add_browser(cmd_parms *cmd, void *dummy, char *name,
const char *feature)
{
browser_server_config_rec *sconf =
get_module_config (cmd->server->module_config, &browser_module);
browser_entry *new, *entries = (browser_entry *)sconf->browsers->elts;
char *var;
int i, cflags = (int)cmd->info;
/* First, try to merge into an existing entry */
for (i = 0; i < sconf->browsers->nelts; ++i) {
browser_entry *b = &entries[i];
if (!strcmp(b->name, name)) {
var = getword(cmd->pool, &feature, '=');
if (*feature) table_set(b->features, var, feature);
else if (*var == '!') table_set(b->features, var + 1, "!");
else table_set(b->features, var, "1");
return NULL;
}
}
/* If none was found, create a new entry */
new = push_array(sconf->browsers);
new->name = name;
new->preg = pregcomp (cmd->pool, name, REG_EXTENDED|REG_NOSUB|cflags);
if (new->preg == NULL) {
return "Browser regex could not be compiled.";
}
new->features = make_table(cmd->pool, 5);
var = getword(cmd->pool, &feature, '=');
if (*feature) table_set(new->features, var, feature);
else if (*var == '!') table_set(new->features, var + 1, "!");
else table_set(new->features, var, "1");
return NULL;
}
command_rec browser_module_cmds[] = {
{ "BrowserMatch", add_browser, (void*)0,
RSRC_CONF, ITERATE2, "A browser regex and a list of variables." },
{ "BrowserMatchNoCase", add_browser, (void*)REG_ICASE,
RSRC_CONF, ITERATE2, "a browser regex and a list of variables." },
{ NULL },
};
static int browser_match(request_rec *r)
{
server_rec *s = r->server;
browser_server_config_rec *sconf = get_module_config (s->module_config,
&browser_module);
browser_entry *entries = (browser_entry *)sconf->browsers->elts;
table_entry *elts;
char *ua = table_get(r->headers_in, "User-Agent");
int i, j;
if (!ua) return DECLINED;
for (i = 0; i < sconf->browsers->nelts; ++i) {
browser_entry *b = &entries[i];
if (!regexec(b->preg, ua, 0, NULL, 0)) {
elts = (table_entry *)b->features->elts;
for (j = 0; j < b->features->nelts; ++j) {
if (!strcmp(elts[j].val, "!"))
table_unset(r->subprocess_env, elts[j].key);
else
table_set(r->subprocess_env, elts[j].key, elts[j].val);
}
}
}
return DECLINED;
}
module MODULE_VAR_EXPORT browser_module = {
STANDARD_MODULE_STUFF,
NULL, /* initializer */
NULL, /* dir config creater */
NULL, /* dir merger --- default is to override */
create_browser_config, /* server config */
merge_browser_config, /* merge server configs */
browser_module_cmds, /* command table */
NULL, /* handlers */
browser_match, /* filename translation */
NULL, /* check_user_id */
NULL, /* check auth */
NULL, /* check access */
NULL, /* type_checker */
NULL, /* fixups */
NULL, /* logger */
NULL, /* header parser */
NULL /* child_init */
};
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