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#include <ctype.h>
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#include <stdlib.h>
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#include <string.h>
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#include "base.h"
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#include "log.h"
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#include "buffer.h"
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#include "plugin.h"
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#include "response.h"
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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typedef struct {
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pcre_keyvalue_buffer *redirect;
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data_config *context; /* to which apply me */
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} plugin_config;
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typedef struct {
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PLUGIN_DATA;
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buffer *match_buf;
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buffer *location;
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size_t status;
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plugin_config **config_storage;
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plugin_config conf;
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} plugin_data;
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INIT_FUNC(mod_redirect_init) {
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plugin_data *p;
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p = calloc(1, sizeof(*p));
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p->match_buf = buffer_init();
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p->location = buffer_init();
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return p;
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}
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FREE_FUNC(mod_redirect_free) {
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plugin_data *p = p_d;
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if (!p) return HANDLER_GO_ON;
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if (p->config_storage) {
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size_t i;
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for (i = 0; i < srv->config_context->used; i++) {
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plugin_config *s = p->config_storage[i];
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pcre_keyvalue_buffer_free(s->redirect);
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free(s);
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}
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free(p->config_storage);
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}
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buffer_free(p->match_buf);
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buffer_free(p->location);
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p->status = 0;
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free(p);
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return HANDLER_GO_ON;
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}
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SETDEFAULTS_FUNC(mod_redirect_set_defaults) {
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plugin_data *p = p_d;
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data_unset *du;
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size_t i = 0;
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config_values_t cv[] = {
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{ "url.redirect", NULL, T_CONFIG_LOCAL, T_CONFIG_SCOPE_CONNECTION }, /* 0 */
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{ NULL, NULL, T_CONFIG_UNSET, T_CONFIG_SCOPE_UNSET }
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};
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if (!p) return HANDLER_ERROR;
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/* 0 */
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p->config_storage = calloc(1, srv->config_context->used * sizeof(specific_config *));
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for (i = 0; i < srv->config_context->used; i++) {
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plugin_config *s;
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size_t j;
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array *ca;
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data_array *da = (data_array *)du;
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s = calloc(1, sizeof(plugin_config));
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s->redirect = pcre_keyvalue_buffer_init();
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cv[0].destination = s->redirect;
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p->config_storage[i] = s;
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ca = ((data_config *)srv->config_context->data[i])->value;
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if (0 != config_insert_values_global(srv, ca, cv)) {
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return HANDLER_ERROR;
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}
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if (NULL == (du = array_get_element(ca, "url.redirect"))) {
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/* no url.redirect defined */
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if (NULL == (du = array_get_element(ca, "url.redirect-found"))) {
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continue;
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}
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}
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if (du->type != TYPE_ARRAY) {
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log_error_write(srv, __FILE__, __LINE__, "sss",
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"unexpected type for key: ", "url.redirect", "array of strings");
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return HANDLER_ERROR;
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}
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da = (data_array *)du;
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for (j = 0; j < da->value->used; j++) {
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if (da->value->data[j]->type != TYPE_STRING) {
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log_error_write(srv, __FILE__, __LINE__, "sssbs",
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"unexpected type for key: ",
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"url.redirect",
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"[", da->value->data[j]->key, "](string)");
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return HANDLER_ERROR;
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}
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if (0 != pcre_keyvalue_buffer_append(s->redirect,
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((data_string *)(da->value->data[j]))->key->ptr,
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((data_string *)(da->value->data[j]))->value->ptr)) {
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log_error_write(srv, __FILE__, __LINE__, "sb",
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"pcre-compile failed for", da->value->data[j]->key);
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}
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}
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}
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return HANDLER_GO_ON;
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}
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#ifdef HAVE_PCRE_H
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static int mod_redirect_patch_connection(server *srv, connection *con, plugin_data *p) {
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size_t i, j;
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plugin_config *s = p->config_storage[0];
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p->conf.redirect = s->redirect;
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p->conf.context = NULL;
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/* skip the first, the global context */
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for (i = 1; i < srv->config_context->used; i++) {
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data_config *dc = (data_config *)srv->config_context->data[i];
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s = p->config_storage[i];
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/* condition didn't match */
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if (!config_check_cond(srv, con, dc)) continue;
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/* merge config */
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for (j = 0; j < dc->value->used; j++) {
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data_unset *du = dc->value->data[j];
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if (0 == strcmp(du->key->ptr, "url.redirect-found")) {
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p->conf.redirect = s->redirect;
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p->conf.context = dc;
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p->status = 302;
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}
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else
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if (0 == strcmp(du->key->ptr, "url.redirect")) {
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p->conf.redirect = s->redirect;
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p->conf.context = dc;
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p->status = 301;
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}
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}
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}
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return 0;
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}
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#endif
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static handler_t mod_redirect_uri_handler(server *srv, connection *con, void *p_data) {
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#ifdef HAVE_PCRE_H
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plugin_data *p = p_data;
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size_t i;
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/*
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* REWRITE URL
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*
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* e.g. redirect /base/ to /index.php?section=base
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*
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*/
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mod_redirect_patch_connection(srv, con, p);
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buffer_copy_string_buffer(p->match_buf, con->request.uri);
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for (i = 0; i < p->conf.redirect->used; i++) {
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pcre *match;
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pcre_extra *extra;
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const char *pattern;
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size_t pattern_len;
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int n;
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pcre_keyvalue *kv = p->conf.redirect->kv[i];
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# define N 10
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int ovec[N * 3];
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match = kv->key;
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extra = kv->key_extra;
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pattern = kv->value->ptr;
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pattern_len = kv->value->used - 1;
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if ((n = pcre_exec(match, extra, p->match_buf->ptr, p->match_buf->used - 1, 0, 0, ovec, 3 * N)) < 0) {
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if (n != PCRE_ERROR_NOMATCH) {
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log_error_write(srv, __FILE__, __LINE__, "sd",
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"execution error while matching: ", n);
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return HANDLER_ERROR;
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}
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} else {
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const char **list;
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size_t start, end;
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size_t k;
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/* it matched */
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pcre_get_substring_list(p->match_buf->ptr, ovec, n, &list);
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/* search for $[0-9] */
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buffer_reset(p->location);
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start = 0; end = pattern_len;
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for (k = 0; k < pattern_len; k++) {
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if ((pattern[k] == '$' || pattern[k] == '%') &&
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isdigit((unsigned char)pattern[k + 1])) {
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/* got one */
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size_t num = pattern[k + 1] - '0';
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end = k;
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buffer_append_string_len(p->location, pattern + start, end - start);
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if (pattern[k] == '$') {
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/* n is always > 0 */
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if (num < (size_t)n) {
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buffer_append_string(p->location, list[num]);
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}
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} else if (p->conf.context == NULL) {
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/* we have no context, we are global */
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log_error_write(srv, __FILE__, __LINE__, "sb",
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"used a rewrite containing a %[0-9]+ in the global scope, ignored:",
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kv->value);
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} else {
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config_append_cond_match_buffer(con, p->conf.context, p->location, num);
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}
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k++;
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start = k + 1;
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}
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}
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buffer_append_string_len(p->location, pattern + start, pattern_len - start);
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pcre_free(list);
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response_header_insert(srv, con, CONST_STR_LEN("Location"), CONST_BUF_LEN(p->location));
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con->http_status = p->status;
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con->file_finished = 1;
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return HANDLER_FINISHED;
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}
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}
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#undef N
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#else
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UNUSED(srv);
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UNUSED(con);
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UNUSED(p_data);
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#endif
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return HANDLER_GO_ON;
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}
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int mod_redirect_plugin_init(plugin *p) {
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p->version = LIGHTTPD_VERSION_ID;
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p->name = buffer_init_string("redirect");
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p->init = mod_redirect_init;
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p->handle_uri_clean = mod_redirect_uri_handler;
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p->set_defaults = mod_redirect_set_defaults;
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p->cleanup = mod_redirect_free;
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p->data = NULL;
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return 0;
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}
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