Lighttpd

#include <ctype.h>

#include <stdlib.h>

#include <string.h>

#include "base.h"

#include "log.h"

#include "buffer.h"

#include "plugin.h"

#include "response.h"

#ifdef HAVE_CONFIG_H

#include "config.h"

#endif

typedef struct {

	pcre_keyvalue_buffer *redirect;

	data_config *context; /* to which apply me */

} plugin_config;

typedef struct {

	PLUGIN_DATA;

	buffer *match_buf;

	buffer *location;

	size_t status;

	plugin_config **config_storage;

	plugin_config conf;

} plugin_data;

INIT_FUNC(mod_redirect_init) {

	plugin_data *p;

	p = calloc(1, sizeof(*p));

	p->match_buf = buffer_init();

	p->location = buffer_init();

	return p;

}

FREE_FUNC(mod_redirect_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];

			pcre_keyvalue_buffer_free(s->redirect);

			free(s);

		}

		free(p->config_storage);

	}

	buffer_free(p->match_buf);

	buffer_free(p->location);

	p->status = 0;

	free(p);

	return HANDLER_GO_ON;

}

SETDEFAULTS_FUNC(mod_redirect_set_defaults) {

	plugin_data *p = p_d;

	data_unset *du;

	size_t i = 0;

	config_values_t cv[] = {

		{ "url.redirect",               NULL, T_CONFIG_LOCAL, T_CONFIG_SCOPE_CONNECTION }, /* 0 */

		{ NULL,                         NULL, T_CONFIG_UNSET, T_CONFIG_SCOPE_UNSET }

	};

	if (!p) return HANDLER_ERROR;

	/* 0 */

	p->config_storage = calloc(1, srv->config_context->used * sizeof(specific_config *));

	for (i = 0; i < srv->config_context->used; i++) {

		plugin_config *s;

		size_t j;

		array *ca;

		data_array *da = (data_array *)du;

		s = calloc(1, sizeof(plugin_config));

		s->redirect   = pcre_keyvalue_buffer_init();

		cv[0].destination = s->redirect;

		p->config_storage[i] = s;

		ca = ((data_config *)srv->config_context->data[i])->value;

		if (0 != config_insert_values_global(srv, ca, cv)) {

			return HANDLER_ERROR;

		}

		if (NULL == (du = array_get_element(ca, "url.redirect"))) {

			/* no url.redirect defined */

			if (NULL == (du = array_get_element(ca, "url.redirect-found"))) {

				continue;

			}

		}

		if (du->type != TYPE_ARRAY) {

			log_error_write(srv, __FILE__, __LINE__, "sss",

					"unexpected type for key: ", "url.redirect", "array of strings");

			return HANDLER_ERROR;

		}

		da = (data_array *)du;

		for (j = 0; j < da->value->used; j++) {

			if (da->value->data[j]->type != TYPE_STRING) {

				log_error_write(srv, __FILE__, __LINE__, "sssbs",

						"unexpected type for key: ",

						"url.redirect",

						"[", da->value->data[j]->key, "](string)");

				return HANDLER_ERROR;

			}

			if (0 != pcre_keyvalue_buffer_append(s->redirect,

							     ((data_string *)(da->value->data[j]))->key->ptr,

							     ((data_string *)(da->value->data[j]))->value->ptr)) {

				log_error_write(srv, __FILE__, __LINE__, "sb",

						"pcre-compile failed for", da->value->data[j]->key);

			}

		}

	}

	return HANDLER_GO_ON;

}

#ifdef HAVE_PCRE_H

static int mod_redirect_patch_connection(server *srv, connection *con, plugin_data *p) {

	size_t i, j;

	plugin_config *s = p->config_storage[0];

	p->conf.redirect = s->redirect;

	p->conf.context = NULL;

	/* 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 (0 == strcmp(du->key->ptr, "url.redirect-found")) {

                                p->conf.redirect = s->redirect;

                                p->conf.context = dc;

				p->status = 302;

                        }

			else

			if (0 == strcmp(du->key->ptr, "url.redirect")) {

				p->conf.redirect = s->redirect;

				p->conf.context = dc;

				p->status = 301;

			}

		}

	}

	return 0;

}

#endif

static handler_t mod_redirect_uri_handler(server *srv, connection *con, void *p_data) {

#ifdef HAVE_PCRE_H

	plugin_data *p = p_data;

	size_t i;

	/*

	 * REWRITE URL

	 *

	 * e.g. redirect /base/ to /index.php?section=base

	 *

	 */

	mod_redirect_patch_connection(srv, con, p);

	buffer_copy_string_buffer(p->match_buf, con->request.uri);

	for (i = 0; i < p->conf.redirect->used; i++) {

		pcre *match;

		pcre_extra *extra;

		const char *pattern;

		size_t pattern_len;

		int n;

		pcre_keyvalue *kv = p->conf.redirect->kv[i];

# define N 10

		int ovec[N * 3];

		match       = kv->key;

		extra       = kv->key_extra;

		pattern     = kv->value->ptr;

		pattern_len = kv->value->used - 1;

		if ((n = pcre_exec(match, extra, p->match_buf->ptr, p->match_buf->used - 1, 0, 0, ovec, 3 * N)) < 0) {

			if (n != PCRE_ERROR_NOMATCH) {

				log_error_write(srv, __FILE__, __LINE__, "sd",

						"execution error while matching: ", n);

				return HANDLER_ERROR;

			}

		} else {

			const char **list;

			size_t start, end;

			size_t k;

			/* it matched */

			pcre_get_substring_list(p->match_buf->ptr, ovec, n, &list);

			/* search for $[0-9] */

			buffer_reset(p->location);

			start = 0; end = pattern_len;

			for (k = 0; k < pattern_len; k++) {

				if ((pattern[k] == '$' || pattern[k] == '%') &&

				    isdigit((unsigned char)pattern[k + 1])) {

					/* got one */

					size_t num = pattern[k + 1] - '0';

					end = k;

					buffer_append_string_len(p->location, pattern + start, end - start);

					if (pattern[k] == '$') {

						/* n is always > 0 */

						if (num < (size_t)n) {

							buffer_append_string(p->location, list[num]);

						}

					} else if (p->conf.context == NULL) {

						/* we have no context, we are global */

						log_error_write(srv, __FILE__, __LINE__, "sb",

								"used a rewrite containing a %[0-9]+ in the global scope, ignored:",

								kv->value);

					} else {

						config_append_cond_match_buffer(con, p->conf.context, p->location, num);

					}

					k++;

					start = k + 1;

				}

			}

			buffer_append_string_len(p->location, pattern + start, pattern_len - start);

			pcre_free(list);

			response_header_insert(srv, con, CONST_STR_LEN("Location"), CONST_BUF_LEN(p->location));

			con->http_status = p->status;

			con->file_finished = 1;

			return HANDLER_FINISHED;

		}

	}

#undef N

#else

	UNUSED(srv);

	UNUSED(con);

	UNUSED(p_data);

#endif

	return HANDLER_GO_ON;

}

int mod_redirect_plugin_init(plugin *p) {

	p->version     = LIGHTTPD_VERSION_ID;

	p->name        = buffer_init_string("redirect");

	p->init        = mod_redirect_init;

	p->handle_uri_clean  = mod_redirect_uri_handler;

	p->set_defaults  = mod_redirect_set_defaults;

	p->cleanup     = mod_redirect_free;

	p->data        = NULL;

	return 0;

}