You can not select more than 25 topics Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
 
 
 
 
 
 
lighttpd2/src/modules/mod_rewrite.c

387 lines
11 KiB

/*
* mod_rewrite - modify request path and querystring with support for regular expressions
*
* Description:
* mod_rewrite lets you modify (rewrite) the path and querystring of a request.
* It supports matching regular expressions and substitution with captured substrings as well as other placeholders.
* A so called rewrite rule consist of a regular expression and a target string.
*
* If your rewrite target does not contain any questionmark (?), then the querystring will not be altered.
* If it does, then it will be overwritten. To append the original querystring, use %{request.query}.
*
* Placeholders:
* - $1..9 replaced by captured substring of current regex
* - $0 replaced by whole string that matched the regex
* - %0..9 same as $n but uses regex from previous conditional
* - %{var} with var being one of the req.* or phys.* e.g. %{request.host}
* supported vars: request.host, request.path, request.query, request.remoteip, request.localip, request.content_length
* - %{enc:var} same as %{var} but urlencoded e.g. %{enc:request.path}
*
* ?, $ and % can be escaped using \?, \$ and \% respectively.
*
* Setups:
* none
* Options:
* rewrite.debug = <true|false>;
* - if set, debug information is written to the log
* Actions:
* rewrite "/new/path";
* - sets request.path to "/new/path", substituting all placeholders. $0..$9 get replaced by empty strings.
* rewrite "regex" => "/new/path";
* - sets request.path to "/new/path" if "regex" matched the original req.path.
* - $0..$9 get replaced by the captured substrings of the regular expression "regex".
* rewrite ("regex1" => "/new/path1", ..., "regexN" => "/new/pathN");
* - traverses the list of rewrite rules.
* - rewrites request.path to the corresponding "/new/path" if the regex matches and stops traversing the list.
*
* Example config:
* rewrite (
* "^/article/(\d+)/.*$" => "/article.php?id=$1",
* "^/download/(\d+)/(.*)$" => "/download.php?fileid=$1&filename=$2"
* );
* rewrite "^/user/(.+)$" => "/user.php?name=$1";
*
*
* Tip:
* As both config parser and regex compiler use backslashes to escape special characters, you will have to escape them twice.
* For example "^foo\\dbar$" will end up as "^foo\dbar$" as regex input, which would match things like "foo3bar".
*
* Todo:
* - implement rewrite_optimized which reorders rules according to hitcount
* - implement rewrite_raw which uses the raw uri
*
* Authors:
* Copyright (c) 2009 Thomas Porzelt
* Copyright (c) 2010 Stefan Bühler
* License:
* MIT, see COPYING file in the lighttpd 2 tree
*/
#include <lighttpd/base.h>
#include <lighttpd/encoding.h>
LI_API gboolean mod_rewrite_init(liModules *mods, liModule *mod);
LI_API gboolean mod_rewrite_free(liModules *mods, liModule *mod);
typedef struct rewrite_plugin_data rewrite_plugin_data;
struct rewrite_plugin_data {
GPtrArray *tmp_strings; /* array of (GString*) */
};
typedef struct rewrite_rule rewrite_rule;
struct rewrite_rule {
liPattern *path, *querystring;
GRegex *regex;
};
typedef struct rewrite_data rewrite_data;
struct rewrite_data {
GArray *rules;
liPlugin *p;
gboolean raw;
};
static gboolean rewrite_rule_parse(liServer *srv, GString *regex, GString *str, rewrite_rule *rule) {
gchar *qs;
rule->path = rule->querystring = NULL;
rule->regex = NULL;
/* find "not-escaped" ? */
for (qs = str->str; *qs; qs++) {
if ('\\' == *qs) {
qs++;
if (!*qs) break;
} else if ('?' == *qs) break;
}
if (!*qs) qs = NULL;
if (NULL != qs) {
*qs = '\0'; /* restore later */
rule->querystring = li_pattern_new(srv, qs+1);
if (NULL == rule->querystring) {
goto error;
}
}
rule->path = li_pattern_new(srv, str->str);
if (NULL == rule->path) {
goto error;
}
if (NULL != regex) {
GError *err = NULL;
rule->regex = g_regex_new(regex->str, G_REGEX_RAW | G_REGEX_OPTIMIZE, 0, &err);
if (NULL == rule->regex || NULL != err) {
ERROR(srv, "rewrite: error compiling regex \"%s\": %s", regex->str, NULL != err ? err->message : "unknown error");
g_error_free(err);
goto error;
}
}
if (NULL != qs) {
*qs = '?';
}
return TRUE;
error:
if (NULL != rule->querystring) {
li_pattern_free(rule->querystring);
rule->querystring = NULL;
}
if (NULL != rule->path) {
li_pattern_free(rule->path);
rule->path = NULL;
}
if (NULL != rule->regex) {
g_regex_unref(rule->regex);
rule->regex = NULL;
}
if (NULL != qs) {
*qs = '?';
}
return FALSE;
}
static gboolean rewrite_internal(liVRequest *vr, GString *dest_path, GString *dest_query, rewrite_rule *rule, gboolean raw) {
gchar *path;
GMatchInfo *match_info = NULL;
GMatchInfo *prev_match_info = NULL;
if (raw) {
path = vr->request.uri.raw_path->str;
} else {
path = vr->request.uri.path->str;
}
if (NULL != rule->regex && !g_regex_match(rule->regex, path, 0, &match_info)) {
if (NULL != match_info) {
g_match_info_free(match_info);
}
return FALSE;
}
if (vr->action_stack.regex_stack->len) {
GArray *rs = vr->action_stack.regex_stack;
prev_match_info = g_array_index(rs, liActionRegexStackElement, rs->len - 1).match_info;
}
g_string_truncate(dest_path, 0);
g_string_truncate(dest_query, 0);
li_pattern_eval(vr, dest_path, rule->path, li_pattern_regex_cb, match_info, li_pattern_regex_cb, prev_match_info);
if (NULL != rule->querystring) {
li_pattern_eval(vr, dest_query, rule->querystring, li_pattern_regex_cb, match_info, li_pattern_regex_cb, prev_match_info);
}
g_match_info_free(match_info);
return TRUE;
}
static liHandlerResult rewrite(liVRequest *vr, gpointer param, gpointer *context) {
guint i;
rewrite_rule *rule;
rewrite_data *rd = param;
rewrite_plugin_data *rpd = rd->p->data;
gboolean debug = _OPTION(vr, rd->p, 0).boolean;
UNUSED(context);
for (i = 0; i < rd->rules->len; i++) {
GString *dest_path = vr->wrk->tmp_str;
GString *dest_query = g_ptr_array_index(rpd->tmp_strings, vr->wrk->ndx);
rule = &g_array_index(rd->rules, rewrite_rule, i);
if (rewrite_internal(vr, dest_path, dest_query, rule, rd->raw)) {
/* regex matched */
if (debug) {
VR_DEBUG(vr, "rewrite: path \"%s\" => \"%s\", query \"%s\" => \"%s\"",
vr->request.uri.path->str, dest_path->str,
vr->request.uri.query->str, dest_query->str
);
}
/* change request path */
g_string_truncate(vr->request.uri.path, 0);
g_string_append_len(vr->request.uri.path, GSTR_LEN(dest_path));
/* change request query */
if (NULL != rule->querystring) {
g_string_truncate(vr->request.uri.query, 0);
g_string_append_len(vr->request.uri.query, GSTR_LEN(dest_query));
}
/* stop at first matching regex */
return LI_HANDLER_GO_ON;
}
}
return LI_HANDLER_GO_ON;
}
static void rewrite_free(liServer *srv, gpointer param) {
guint i;
rewrite_data *rd = param;
UNUSED(srv);
for (i = 0; i < rd->rules->len; i++) {
rewrite_rule *rule = &g_array_index(rd->rules, rewrite_rule, i);
li_pattern_free(rule->path);
li_pattern_free(rule->querystring);
if (rule->regex) {
g_regex_unref(rule->regex);
}
}
g_array_free(rd->rules, TRUE);
g_slice_free(rewrite_data, rd);
}
static liAction* rewrite_create(liServer *srv, liWorker *wrk, liPlugin* p, liValue *val, gpointer userdata) {
GArray *arr;
liValue *v;
guint i;
rewrite_data *rd;
rewrite_plugin_data *rpd = p->data;
UNUSED(wrk);
if (!val || !(val->type == LI_VALUE_STRING || val->type == LI_VALUE_LIST)) {
ERROR(srv, "%s", "rewrite expects a either a string, a tuple of strings or a list of string tuples");
return NULL;
}
if (!rpd->tmp_strings->len) {
guint wc = srv->worker_count ? srv->worker_count : 1;
for (i = 0; i < wc; i++)
g_ptr_array_add(rpd->tmp_strings, g_string_sized_new(31));
}
rd = g_slice_new(rewrite_data);
rd->p = p;
rd->rules = g_array_new(FALSE, FALSE, sizeof(rewrite_rule));
rd->raw = GPOINTER_TO_INT(userdata);
arr = val->data.list;
if (val->type == LI_VALUE_STRING) {
/* rewrite "/foo/bar"; */
rewrite_rule rule = { NULL, NULL, NULL };
if (!rewrite_rule_parse(srv, NULL, val->data.string, &rule)) {
rewrite_free(NULL, rd);
ERROR(srv, "rewrite: error parsing rule \"%s\"", val->data.string->str);
return NULL;
}
g_array_append_val(rd->rules, rule);
} else if (arr->len == 2 && g_array_index(arr, liValue*, 0)->type == LI_VALUE_STRING && g_array_index(arr, liValue*, 1)->type == LI_VALUE_STRING) {
/* only one rule */
rewrite_rule rule = { NULL, NULL, NULL };
if (!rewrite_rule_parse(srv, g_array_index(arr, liValue*, 0)->data.string, g_array_index(arr, liValue*, 1)->data.string, &rule)) {
rewrite_free(NULL, rd);
return NULL;
}
g_array_append_val(rd->rules, rule);
} else {
/* probably multiple rules */
for (i = 0; i < arr->len; i++) {
rewrite_rule rule = { NULL, NULL, NULL };
v = g_array_index(arr, liValue*, i);
if (v->type != LI_VALUE_LIST || v->data.list->len != 2 ||
g_array_index(v->data.list, liValue*, 0)->type != LI_VALUE_STRING || g_array_index(v->data.list, liValue*, 1)->type != LI_VALUE_STRING) {
rewrite_free(NULL, rd);
ERROR(srv, "%s", "rewrite expects a either a tuple of strings or a list of those");
return NULL;
}
if (!rewrite_rule_parse(srv, g_array_index(v->data.list, liValue*, 0)->data.string, g_array_index(v->data.list, liValue*, 1)->data.string, &rule)) {
rewrite_free(NULL, rd);
return NULL;
}
g_array_append_val(rd->rules, rule);
}
}
return li_action_new_function(rewrite, NULL, rewrite_free, rd);
}
static const liPluginOption options[] = {
{ "rewrite.debug", LI_VALUE_BOOLEAN, FALSE, NULL },
{ NULL, 0, 0, NULL }
};
static const liPluginAction actions[] = {
{ "rewrite", rewrite_create, GINT_TO_POINTER(FALSE) },
{ "rewrite_raw", rewrite_create, GINT_TO_POINTER(TRUE) },
{ NULL, NULL, NULL }
};
static const liPluginSetup setups[] = {
{ NULL, NULL, NULL }
};
static void plugin_rewrite_free(liServer *srv, liPlugin *p) {
guint i;
rewrite_plugin_data *data = p->data;
UNUSED(srv);
for (i = 0; i < data->tmp_strings->len; i++)
g_string_free(g_ptr_array_index(data->tmp_strings, i), TRUE);
g_ptr_array_free(data->tmp_strings, TRUE);
g_slice_free(rewrite_plugin_data, data);
}
static void plugin_rewrite_init(liServer *srv, liPlugin *p, gpointer userdata) {
UNUSED(srv); UNUSED(userdata);
p->options = options;
p->actions = actions;
p->setups = setups;
p->free = plugin_rewrite_free;
p->data = g_slice_new(rewrite_plugin_data);
((rewrite_plugin_data*)p->data)->tmp_strings = g_ptr_array_new();
}
gboolean mod_rewrite_init(liModules *mods, liModule *mod) {
UNUSED(mod);
MODULE_VERSION_CHECK(mods);
mod->config = li_plugin_register(mods->main, "mod_rewrite", plugin_rewrite_init, NULL);
return mod->config != NULL;
}
gboolean mod_rewrite_free(liModules *mods, liModule *mod) {
if (mod->config)
li_plugin_free(mods->main, mod->config);
return TRUE;
}