lighttpd 1.4.x https://www.lighttpd.net/
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#include "first.h"
#include "base.h"
#include "keyvalue.h"
#include "log.h"
#include "buffer.h"
#include "burl.h"
#include "plugin.h"
#include "stat_cache.h"
#include <stdlib.h>
#include <string.h>
typedef struct {
pcre_keyvalue_buffer *rewrite;
pcre_keyvalue_buffer *rewrite_NF;
data_config *context, *context_NF; /* to which apply me */
int rewrite_repeat_idx, rewrite_NF_repeat_idx;
} plugin_config;
typedef struct {
enum { REWRITE_STATE_UNSET, REWRITE_STATE_FINISHED} state;
int loops;
} handler_ctx;
typedef struct {
PLUGIN_DATA;
plugin_config **config_storage;
plugin_config conf;
} plugin_data;
static handler_ctx * handler_ctx_init(void) {
handler_ctx * hctx;
hctx = calloc(1, sizeof(*hctx));
hctx->state = REWRITE_STATE_UNSET;
hctx->loops = 0;
return hctx;
}
static void handler_ctx_free(handler_ctx *hctx) {
free(hctx);
}
INIT_FUNC(mod_rewrite_init) {
return calloc(1, sizeof(plugin_data));
}
FREE_FUNC(mod_rewrite_free) {
plugin_data *p = p_d;
if (!p) return HANDLER_GO_ON;
if (p->config_storage) {
size_t i;
for (i = 0; i < srv->config_context->used; i++) {
plugin_config *s = p->config_storage[i];
if (NULL == s) continue;
pcre_keyvalue_buffer_free(s->rewrite);
pcre_keyvalue_buffer_free(s->rewrite_NF);
free(s);
}
free(p->config_storage);
}
free(p);
return HANDLER_GO_ON;
}
static int parse_config_entry(server *srv, array *ca, pcre_keyvalue_buffer *kvb, const char *option, size_t olen) {
data_unset *du;
if (NULL != (du = array_get_element_klen(ca, option, olen))) {
data_array *da;
size_t j;
da = (data_array *)du;
if (du->type != TYPE_ARRAY || !array_is_kvstring(da->value)) {
log_error_write(srv, __FILE__, __LINE__, "SSS",
"unexpected value for ", option, "; expected list of \"regex\" => \"subst\"");
return HANDLER_ERROR;
}
for (j = 0; j < da->value->used; j++) {
data_string *ds = (data_string *)da->value->data[j];
if (srv->srvconf.http_url_normalize) {
pcre_keyvalue_burl_normalize_key(ds->key, srv->tmp_buf);
pcre_keyvalue_burl_normalize_value(ds->value, srv->tmp_buf);
}
if (0 != pcre_keyvalue_buffer_append(srv, kvb, ds->key, ds->value)) {
log_error_write(srv, __FILE__, __LINE__, "sb",
"pcre-compile failed for", ds->key);
return HANDLER_ERROR;
}
}
}
return 0;
}
SETDEFAULTS_FUNC(mod_rewrite_set_defaults) {
size_t i = 0;
config_values_t cv[] = {
{ "url.rewrite-repeat", NULL, T_CONFIG_LOCAL, T_CONFIG_SCOPE_CONNECTION }, /* 0 */
{ "url.rewrite-once", NULL, T_CONFIG_LOCAL, T_CONFIG_SCOPE_CONNECTION }, /* 1 */
/* these functions only rewrite if the target is not already in the filestore
*
* url.rewrite-repeat-if-not-file is the equivalent of url.rewrite-repeat
* url.rewrite-if-not-file is the equivalent of url.rewrite-once
*
*/
{ "url.rewrite-repeat-if-not-file", NULL, T_CONFIG_LOCAL, T_CONFIG_SCOPE_CONNECTION }, /* 2 */
{ "url.rewrite-if-not-file", NULL, T_CONFIG_LOCAL, T_CONFIG_SCOPE_CONNECTION }, /* 3 */
/* old names, still supported
*
* url.rewrite remapped to url.rewrite-once
* url.rewrite-final is url.rewrite-once
*
*/
{ "url.rewrite", NULL, T_CONFIG_LOCAL, T_CONFIG_SCOPE_CONNECTION }, /* 4 */
{ "url.rewrite-final", NULL, T_CONFIG_LOCAL, T_CONFIG_SCOPE_CONNECTION }, /* 5 */
{ NULL, NULL, T_CONFIG_UNSET, T_CONFIG_SCOPE_UNSET }
};
plugin_data *p = p_d;
if (!p) return HANDLER_ERROR;
/* 0 */
p->config_storage = calloc(srv->config_context->used, sizeof(plugin_config *));
for (i = 0; i < srv->config_context->used; i++) {
data_config const* config = (data_config const*)srv->config_context->data[i];
plugin_config *s;
s = calloc(1, sizeof(plugin_config));
s->rewrite = pcre_keyvalue_buffer_init();
s->rewrite_NF = pcre_keyvalue_buffer_init();
p->config_storage[i] = s;
if (0 != config_insert_values_global(srv, config->value, cv, i == 0 ? T_CONFIG_SCOPE_SERVER : T_CONFIG_SCOPE_CONNECTION)) {
return HANDLER_ERROR;
}
parse_config_entry(srv, config->value, s->rewrite, CONST_STR_LEN("url.rewrite-once"));
parse_config_entry(srv, config->value, s->rewrite, CONST_STR_LEN("url.rewrite-final"));
parse_config_entry(srv, config->value, s->rewrite_NF, CONST_STR_LEN("url.rewrite-if-not-file"));
s->rewrite_NF_repeat_idx = (int)s->rewrite_NF->used;
parse_config_entry(srv, config->value, s->rewrite_NF, CONST_STR_LEN("url.rewrite-repeat-if-not-file"));
parse_config_entry(srv, config->value, s->rewrite, CONST_STR_LEN("url.rewrite"));
s->rewrite_repeat_idx = (int)s->rewrite->used;
parse_config_entry(srv, config->value, s->rewrite, CONST_STR_LEN("url.rewrite-repeat"));
}
return HANDLER_GO_ON;
}
#define PATCH(x) \
p->conf.x = s->x;
static int mod_rewrite_patch_connection(server *srv, connection *con, plugin_data *p) {
size_t i, j;
plugin_config *s = p->config_storage[0];
PATCH(rewrite);
PATCH(rewrite_NF);
p->conf.context = NULL;
p->conf.context_NF = NULL;
PATCH(rewrite_repeat_idx);
PATCH(rewrite_NF_repeat_idx);
/* skip the first, the global context */
for (i = 1; i < srv->config_context->used; i++) {
data_config *dc = (data_config *)srv->config_context->data[i];
s = p->config_storage[i];
/* condition didn't match */
if (!config_check_cond(srv, con, dc)) continue;
/* merge config */
for (j = 0; j < dc->value->used; j++) {
data_unset *du = dc->value->data[j];
if (buffer_is_equal_string(du->key, CONST_STR_LEN("url.rewrite"))) {
PATCH(rewrite);
p->conf.context = dc;
PATCH(rewrite_repeat_idx);
} else if (buffer_is_equal_string(du->key, CONST_STR_LEN("url.rewrite-once"))) {
PATCH(rewrite);
p->conf.context = dc;
PATCH(rewrite_repeat_idx);
} else if (buffer_is_equal_string(du->key, CONST_STR_LEN("url.rewrite-repeat"))) {
PATCH(rewrite);
p->conf.context = dc;
PATCH(rewrite_repeat_idx);
} else if (buffer_is_equal_string(du->key, CONST_STR_LEN("url.rewrite-if-not-file"))) {
PATCH(rewrite_NF);
p->conf.context_NF = dc;
PATCH(rewrite_NF_repeat_idx);
} else if (buffer_is_equal_string(du->key, CONST_STR_LEN("url.rewrite-repeat-if-not-file"))) {
PATCH(rewrite_NF);
p->conf.context_NF = dc;
PATCH(rewrite_NF_repeat_idx);
} else if (buffer_is_equal_string(du->key, CONST_STR_LEN("url.rewrite-final"))) {
PATCH(rewrite);
p->conf.context = dc;
PATCH(rewrite_repeat_idx);
}
}
}
return 0;
}
URIHANDLER_FUNC(mod_rewrite_con_reset) {
plugin_data *p = p_d;
UNUSED(srv);
if (con->plugin_ctx[p->id]) {
handler_ctx_free(con->plugin_ctx[p->id]);
con->plugin_ctx[p->id] = NULL;
}
return HANDLER_GO_ON;
}
static handler_t process_rewrite_rules(server *srv, connection *con, plugin_data *p, pcre_keyvalue_buffer *kvb, int repeat_idx) {
handler_ctx *hctx;
struct burl_parts_t burl;
pcre_keyvalue_ctx ctx;
handler_t rc;
if (con->plugin_ctx[p->id]) {
hctx = con->plugin_ctx[p->id];
if (hctx->loops++ > 100) {
data_config *dc = p->conf.context;
if (NULL == dc) {
log_error_write(srv, __FILE__, __LINE__, "s",
"ENDLESS LOOP IN rewrite-rule DETECTED ... aborting request");
return HANDLER_ERROR;
}
log_error_write(srv, __FILE__, __LINE__, "SbbSBS",
"ENDLESS LOOP IN rewrite-rule DETECTED ... aborting request, perhaps you want to use url.rewrite-once instead of url.rewrite-repeat ($", dc->comp_key, dc->op, "\"", dc->string, "\")");
return HANDLER_ERROR;
}
if (hctx->state == REWRITE_STATE_FINISHED) return HANDLER_GO_ON;
}
ctx.cache = p->conf.context ? &con->cond_cache[p->conf.context->context_ndx] : NULL;
ctx.burl = &burl;
burl.scheme = con->uri.scheme;
burl.authority = con->uri.authority;
burl.port = sock_addr_get_port(&con->srv_socket->addr);
burl.path = con->uri.path_raw;
burl.query = con->uri.query;
if (buffer_string_is_empty(burl.authority))
burl.authority = con->server_name;
rc = pcre_keyvalue_buffer_process(kvb, &ctx, con->request.uri, srv->tmp_buf);
if (HANDLER_FINISHED == rc && !buffer_is_empty(srv->tmp_buf) && srv->tmp_buf->ptr[0] == '/') {
buffer_copy_buffer(con->request.uri, srv->tmp_buf);
if (con->plugin_ctx[p->id] == NULL) {
hctx = handler_ctx_init();
con->plugin_ctx[p->id] = hctx;
} else {
hctx = con->plugin_ctx[p->id];
}
if (ctx.m < repeat_idx) hctx->state = REWRITE_STATE_FINISHED;
buffer_reset(con->physical.path);
rc = HANDLER_COMEBACK;
}
else if (HANDLER_FINISHED == rc) {
rc = HANDLER_ERROR;
log_error_write(srv, __FILE__, __LINE__, "sb",
"mod_rewrite invalid result (not beginning with '/') while processing uri:",
con->request.uri);
}
else if (HANDLER_ERROR == rc) {
log_error_write(srv, __FILE__, __LINE__, "sb",
"pcre_exec() error while processing uri:",
con->request.uri);
}
return rc;
}
URIHANDLER_FUNC(mod_rewrite_physical) {
plugin_data *p = p_d;
stat_cache_entry *sce;
if (con->mode != DIRECT) return HANDLER_GO_ON;
mod_rewrite_patch_connection(srv, con, p);
p->conf.context = p->conf.context_NF;
if (!p->conf.rewrite_NF->used) return HANDLER_GO_ON;
/* skip if physical.path is a regular file */
sce = NULL;
if (HANDLER_ERROR != stat_cache_get_entry(srv, con, con->physical.path, &sce)) {
if (S_ISREG(sce->st.st_mode)) return HANDLER_GO_ON;
}
return process_rewrite_rules(srv, con, p, p->conf.rewrite_NF, p->conf.rewrite_NF_repeat_idx);
}
URIHANDLER_FUNC(mod_rewrite_uri_handler) {
plugin_data *p = p_d;
mod_rewrite_patch_connection(srv, con, p);
if (!p->conf.rewrite->used) return HANDLER_GO_ON;
return process_rewrite_rules(srv, con, p, p->conf.rewrite, p->conf.rewrite_repeat_idx);
}
int mod_rewrite_plugin_init(plugin *p);
int mod_rewrite_plugin_init(plugin *p) {
p->version = LIGHTTPD_VERSION_ID;
p->name = buffer_init_string("rewrite");
p->init = mod_rewrite_init;
/* it has to stay _raw as we are matching on uri + querystring
*/
p->handle_uri_raw = mod_rewrite_uri_handler;
p->handle_physical = mod_rewrite_physical;
p->cleanup = mod_rewrite_free;
p->connection_reset = mod_rewrite_con_reset;
p->set_defaults = mod_rewrite_set_defaults;
p->data = NULL;
return 0;
}