lighttpd/src/mod_rewrite.c - axis-axis2-c-core - Git at Google

 #include <ctype.h>
 #include <stdlib.h>
 #include <string.h>

 #include "base.h"
 #include "log.h"
 #include "buffer.h"

 #include "plugin.h"

 #ifdef HAVE_CONFIG_H
 #include "config.h"
 #endif

 typedef struct {
 #ifdef HAVE_PCRE_H
 	pcre *key;
 #endif

 	buffer *value;

 	int once;
 } rewrite_rule;

 typedef struct {
 	rewrite_rule **ptr;

 	size_t used;
 	size_t size;
 } rewrite_rule_buffer;

 typedef struct {
 	rewrite_rule_buffer *rewrite;
 	data_config *context; /* to which apply me */
 } plugin_config;

 typedef struct {
 	enum { REWRITE_STATE_UNSET, REWRITE_STATE_FINISHED} state;
 	int loops;
 } handler_ctx;

 typedef struct {
 	PLUGIN_DATA;
 	buffer *match_buf;

 	plugin_config **config_storage;

 	plugin_config conf;
 } plugin_data;

 static handler_ctx * handler_ctx_init() {
 	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);
 }

 rewrite_rule_buffer *rewrite_rule_buffer_init(void) {
 	rewrite_rule_buffer *kvb;

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

 	return kvb;
 }

 int rewrite_rule_buffer_append(rewrite_rule_buffer *kvb, buffer *key, buffer *value, int once) {
 #ifdef HAVE_PCRE_H
 	size_t i;
 	const char *errptr;
 	int erroff;

 	if (!key) return -1;

 	if (kvb->size == 0) {
 		kvb->size = 4;
 		kvb->used = 0;

 		kvb->ptr = malloc(kvb->size * sizeof(*kvb->ptr));

 		for(i = 0; i < kvb->size; i++) {
 			kvb->ptr[i] = calloc(1, sizeof(**kvb->ptr));
 		}
 	} else if (kvb->used == kvb->size) {
 		kvb->size += 4;

 		kvb->ptr = realloc(kvb->ptr, kvb->size * sizeof(*kvb->ptr));

 		for(i = kvb->used; i < kvb->size; i++) {
 			kvb->ptr[i] = calloc(1, sizeof(**kvb->ptr));
 		}
 	}

 	if (NULL == (kvb->ptr[kvb->used]->key = pcre_compile(key->ptr,
 							    0, &errptr, &erroff, NULL))) {

 		return -1;
 	}

 	kvb->ptr[kvb->used]->value = buffer_init();
 	buffer_copy_string_buffer(kvb->ptr[kvb->used]->value, value);
 	kvb->ptr[kvb->used]->once = once;

 	kvb->used++;

 	return 0;
 #else
 	UNUSED(kvb);
 	UNUSED(value);
 	UNUSED(once);
 	UNUSED(key);

 	return -1;
 #endif
 }

 void rewrite_rule_buffer_free(rewrite_rule_buffer *kvb) {
 #ifdef HAVE_PCRE_H
 	size_t i;

 	for (i = 0; i < kvb->size; i++) {
 		if (kvb->ptr[i]->key) pcre_free(kvb->ptr[i]->key);
 		if (kvb->ptr[i]->value) buffer_free(kvb->ptr[i]->value);
 		free(kvb->ptr[i]);
 	}

 	if (kvb->ptr) free(kvb->ptr);
 #endif

 	free(kvb);
 }


 INIT_FUNC(mod_rewrite_init) {
 	plugin_data *p;

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

 	p->match_buf = buffer_init();

 	return p;
 }

 FREE_FUNC(mod_rewrite_free) {
 	plugin_data *p = p_d;

 	UNUSED(srv);

 	if (!p) return HANDLER_GO_ON;

 	buffer_free(p->match_buf);
 	if (p->config_storage) {
 		size_t i;
 		for (i = 0; i < srv->config_context->used; i++) {
 			plugin_config *s = p->config_storage[i];
 			rewrite_rule_buffer_free(s->rewrite);

 			free(s);
 		}
 		free(p->config_storage);
 	}

 	free(p);

 	return HANDLER_GO_ON;
 }

 static int parse_config_entry(server *srv, plugin_config *s, array *ca, const char *option, int once) {
 	data_unset *du;

 	if (NULL != (du = array_get_element(ca, option))) {
 		data_array *da = (data_array *)du;
 		size_t j;

 		if (du->type != TYPE_ARRAY) {
 			log_error_write(srv, __FILE__, __LINE__, "sss",
 					"unexpected type for key: ", option, "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: ",
 						option,
 						"[", da->value->data[j]->key, "](string)");

 				return HANDLER_ERROR;
 			}

 			if (0 != rewrite_rule_buffer_append(s->rewrite,
 							    ((data_string *)(da->value->data[j]))->key,
 							    ((data_string *)(da->value->data[j]))->value,
 							    once)) {
 #ifdef HAVE_PCRE_H
 				log_error_write(srv, __FILE__, __LINE__, "sb",
 						"pcre-compile failed for", da->value->data[j]->key);
 #else
 				log_error_write(srv, __FILE__, __LINE__, "s",
 						"pcre support is missing, please install libpcre and the headers");
 #endif
 			}
 		}
 	}

 	return 0;
 }

 SETDEFAULTS_FUNC(mod_rewrite_set_defaults) {
 	plugin_data *p = p_d;
 	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 */

 		/* 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 }, /* 2 */
 		{ "url.rewrite-final",         NULL, T_CONFIG_LOCAL, T_CONFIG_SCOPE_CONNECTION }, /* 3 */
 		{ 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;
 		array *ca;

 		s = calloc(1, sizeof(plugin_config));
 		s->rewrite   = rewrite_rule_buffer_init();

 		cv[0].destination = s->rewrite;
 		cv[1].destination = s->rewrite;
 		cv[2].destination = s->rewrite;

 		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;
 		}

 		parse_config_entry(srv, s, ca, "url.rewrite-once",   1);
 		parse_config_entry(srv, s, ca, "url.rewrite-final",  1);
 		parse_config_entry(srv, s, ca, "url.rewrite",        1);
 		parse_config_entry(srv, s, ca, "url.rewrite-repeat", 0);
 	}

 	return HANDLER_GO_ON;
 }
 #ifdef HAVE_PCRE_H
 static int mod_rewrite_patch_connection(server *srv, connection *con, plugin_data *p) {
 	size_t i, j;
 	plugin_config *s = p->config_storage[0];

 	p->conf.rewrite = s->rewrite;
 	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];

 		if (COMP_HTTP_URL == dc->comp) continue;

 		/* 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"))) {
 				p->conf.rewrite = s->rewrite;
 				p->conf.context = dc;
 			} else if (buffer_is_equal_string(du->key, CONST_STR_LEN("url.rewrite-once"))) {
 				p->conf.rewrite = s->rewrite;
 				p->conf.context = dc;
 			} else if (buffer_is_equal_string(du->key, CONST_STR_LEN("url.rewrite-repeat"))) {
 				p->conf.rewrite = s->rewrite;
 				p->conf.context = dc;
 			} else if (buffer_is_equal_string(du->key, CONST_STR_LEN("url.rewrite-final"))) {
 				p->conf.rewrite = s->rewrite;
 				p->conf.context = dc;
 			}
 		}
 	}

 	return 0;
 }
 #endif
 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;
 }

 URIHANDLER_FUNC(mod_rewrite_uri_handler) {
 #ifdef HAVE_PCRE_H
 	plugin_data *p = p_d;
 	size_t i;
 	handler_ctx *hctx;

 	/*
 	 * REWRITE URL
 	 *
 	 * e.g. rewrite /base/ to /index.php?section=base
 	 *
 	 */

 	if (con->plugin_ctx[p->id]) {
 		hctx = con->plugin_ctx[p->id];

 		if (hctx->loops++ > 100) {
 			log_error_write(srv, __FILE__, __LINE__,  "s",
 					"ENDLESS LOOP IN rewrite-rule DETECTED ... aborting request, perhaps you want to use url.rewrite-once instead of url.rewrite-repeat");

 			return HANDLER_ERROR;
 		}

 		if (hctx->state == REWRITE_STATE_FINISHED) return HANDLER_GO_ON;
 	}

 	mod_rewrite_patch_connection(srv, con, p);

 	if (!p->conf.rewrite) return HANDLER_GO_ON;

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

 	for (i = 0; i < p->conf.rewrite->used; i++) {
 		pcre *match;
 		const char *pattern;
 		size_t pattern_len;
 		int n;
 		rewrite_rule *rule = p->conf.rewrite->ptr[i];
 # define N 10
 		int ovec[N * 3];

 		match       = rule->key;
 		pattern     = rule->value->ptr;
 		pattern_len = rule->value->used - 1;

 		if ((n = pcre_exec(match, NULL, 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(con->request.uri);

 			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(con->request.uri, pattern + start, end - start);

 					if (pattern[k] == '$') {
 						/* n is always > 0 */
 						if (num < (size_t)n) {
 							buffer_append_string(con->request.uri, list[num]);
 						}
 					} else if (p->conf.context == NULL) {
 						/* we have no context, we are global */
 						log_error_write(srv, __FILE__, __LINE__, "sb",
 								"used a redirect containing a %[0-9]+ in the global scope, ignored:",
 								rule->value);

 					} else {
 						config_append_cond_match_buffer(con, p->conf.context, con->request.uri, num);
 					}

 					k++;
 					start = k + 1;
 				}
 			}

 			buffer_append_string_len(con->request.uri, pattern + start, pattern_len - start);

 			pcre_free(list);

 			hctx = handler_ctx_init();

 			con->plugin_ctx[p->id] = hctx;

 			if (rule->once) hctx->state = REWRITE_STATE_FINISHED;

 			return HANDLER_COMEBACK;
 		}
 	}
 #undef N

 #else
 	UNUSED(srv);
 	UNUSED(con);
 	UNUSED(p_d);
 #endif

 	return HANDLER_GO_ON;
 }

 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->set_defaults = mod_rewrite_set_defaults;
 	p->cleanup     = mod_rewrite_free;
 	p->connection_reset = mod_rewrite_con_reset;

 	p->data        = NULL;

 	return 0;
 }
	#include <ctype.h>
	#include <stdlib.h>
	#include <string.h>

	#include "base.h"
	#include "log.h"
	#include "buffer.h"

	#include "plugin.h"

	#ifdef HAVE_CONFIG_H
	#include "config.h"
	#endif

	typedef struct {
	#ifdef HAVE_PCRE_H
	pcre *key;
	#endif

	buffer *value;

	int once;
	} rewrite_rule;

	typedef struct {
	rewrite_rule **ptr;

	size_t used;
	size_t size;
	} rewrite_rule_buffer;

	typedef struct {
	rewrite_rule_buffer *rewrite;
	data_config context; / to which apply me */
	} plugin_config;

	typedef struct {
	enum { REWRITE_STATE_UNSET, REWRITE_STATE_FINISHED} state;
	int loops;
	} handler_ctx;

	typedef struct {
	PLUGIN_DATA;
	buffer *match_buf;

	plugin_config **config_storage;

	plugin_config conf;
	} plugin_data;

	static handler_ctx * handler_ctx_init() {
	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);
	}

	rewrite_rule_buffer *rewrite_rule_buffer_init(void) {
	rewrite_rule_buffer *kvb;

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

	return kvb;
	}

	int rewrite_rule_buffer_append(rewrite_rule_buffer kvb, buffer key, buffer *value, int once) {
	#ifdef HAVE_PCRE_H
	size_t i;
	const char *errptr;
	int erroff;

	if (!key) return -1;

	if (kvb->size == 0) {
	kvb->size = 4;
	kvb->used = 0;

	kvb->ptr = malloc(kvb->size * sizeof(*kvb->ptr));

	for(i = 0; i < kvb->size; i++) {
	kvb->ptr[i] = calloc(1, sizeof(**kvb->ptr));
	}
	} else if (kvb->used == kvb->size) {
	kvb->size += 4;

	kvb->ptr = realloc(kvb->ptr, kvb->size * sizeof(*kvb->ptr));

	for(i = kvb->used; i < kvb->size; i++) {
	kvb->ptr[i] = calloc(1, sizeof(**kvb->ptr));
	}
	}

	if (NULL == (kvb->ptr[kvb->used]->key = pcre_compile(key->ptr,
	0, &errptr, &erroff, NULL))) {

	return -1;
	}

	kvb->ptr[kvb->used]->value = buffer_init();
	buffer_copy_string_buffer(kvb->ptr[kvb->used]->value, value);
	kvb->ptr[kvb->used]->once = once;

	kvb->used++;

	return 0;
	#else
	UNUSED(kvb);
	UNUSED(value);
	UNUSED(once);
	UNUSED(key);

	return -1;
	#endif
	}

	void rewrite_rule_buffer_free(rewrite_rule_buffer *kvb) {
	#ifdef HAVE_PCRE_H
	size_t i;

	for (i = 0; i < kvb->size; i++) {
	if (kvb->ptr[i]->key) pcre_free(kvb->ptr[i]->key);
	if (kvb->ptr[i]->value) buffer_free(kvb->ptr[i]->value);
	free(kvb->ptr[i]);
	}

	if (kvb->ptr) free(kvb->ptr);
	#endif

	free(kvb);
	}


	INIT_FUNC(mod_rewrite_init) {
	plugin_data *p;

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

	p->match_buf = buffer_init();

	return p;
	}

	FREE_FUNC(mod_rewrite_free) {
	plugin_data *p = p_d;

	UNUSED(srv);

	if (!p) return HANDLER_GO_ON;

	buffer_free(p->match_buf);
	if (p->config_storage) {
	size_t i;
	for (i = 0; i < srv->config_context->used; i++) {
	plugin_config *s = p->config_storage[i];
	rewrite_rule_buffer_free(s->rewrite);

	free(s);
	}
	free(p->config_storage);
	}

	free(p);

	return HANDLER_GO_ON;
	}

	static int parse_config_entry(server srv, plugin_config s, array ca, const char option, int once) {
	data_unset *du;

	if (NULL != (du = array_get_element(ca, option))) {
	data_array da = (data_array )du;
	size_t j;

	if (du->type != TYPE_ARRAY) {
	log_error_write(srv, __FILE__, __LINE__, "sss",
	"unexpected type for key: ", option, "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: ",
	option,
	"[", da->value->data[j]->key, "](string)");

	return HANDLER_ERROR;
	}

	if (0 != rewrite_rule_buffer_append(s->rewrite,
	((data_string *)(da->value->data[j]))->key,
	((data_string *)(da->value->data[j]))->value,
	once)) {
	#ifdef HAVE_PCRE_H
	log_error_write(srv, __FILE__, __LINE__, "sb",
	"pcre-compile failed for", da->value->data[j]->key);
	#else
	log_error_write(srv, __FILE__, __LINE__, "s",
	"pcre support is missing, please install libpcre and the headers");
	#endif
	}
	}
	}

	return 0;
	}

	SETDEFAULTS_FUNC(mod_rewrite_set_defaults) {
	plugin_data *p = p_d;
	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 */

	/* 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 }, /* 2 */
	{ "url.rewrite-final", NULL, T_CONFIG_LOCAL, T_CONFIG_SCOPE_CONNECTION }, /* 3 */
	{ 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;
	array *ca;

	s = calloc(1, sizeof(plugin_config));
	s->rewrite = rewrite_rule_buffer_init();

	cv[0].destination = s->rewrite;
	cv[1].destination = s->rewrite;
	cv[2].destination = s->rewrite;

	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;
	}

	parse_config_entry(srv, s, ca, "url.rewrite-once", 1);
	parse_config_entry(srv, s, ca, "url.rewrite-final", 1);
	parse_config_entry(srv, s, ca, "url.rewrite", 1);
	parse_config_entry(srv, s, ca, "url.rewrite-repeat", 0);
	}

	return HANDLER_GO_ON;
	}
	#ifdef HAVE_PCRE_H
	static int mod_rewrite_patch_connection(server srv, connection con, plugin_data *p) {
	size_t i, j;
	plugin_config *s = p->config_storage[0];

	p->conf.rewrite = s->rewrite;
	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];

	if (COMP_HTTP_URL == dc->comp) continue;

	/* 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"))) {
	p->conf.rewrite = s->rewrite;
	p->conf.context = dc;
	} else if (buffer_is_equal_string(du->key, CONST_STR_LEN("url.rewrite-once"))) {
	p->conf.rewrite = s->rewrite;
	p->conf.context = dc;
	} else if (buffer_is_equal_string(du->key, CONST_STR_LEN("url.rewrite-repeat"))) {
	p->conf.rewrite = s->rewrite;
	p->conf.context = dc;
	} else if (buffer_is_equal_string(du->key, CONST_STR_LEN("url.rewrite-final"))) {
	p->conf.rewrite = s->rewrite;
	p->conf.context = dc;
	}
	}
	}

	return 0;
	}
	#endif
	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;
	}

	URIHANDLER_FUNC(mod_rewrite_uri_handler) {
	#ifdef HAVE_PCRE_H
	plugin_data *p = p_d;
	size_t i;
	handler_ctx *hctx;

	/*
	* REWRITE URL
	*
	* e.g. rewrite /base/ to /index.php?section=base
	*
	*/

	if (con->plugin_ctx[p->id]) {
	hctx = con->plugin_ctx[p->id];

	if (hctx->loops++ > 100) {
	log_error_write(srv, __FILE__, __LINE__, "s",
	"ENDLESS LOOP IN rewrite-rule DETECTED ... aborting request, perhaps you want to use url.rewrite-once instead of url.rewrite-repeat");

	return HANDLER_ERROR;
	}

	if (hctx->state == REWRITE_STATE_FINISHED) return HANDLER_GO_ON;
	}

	mod_rewrite_patch_connection(srv, con, p);

	if (!p->conf.rewrite) return HANDLER_GO_ON;

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

	for (i = 0; i < p->conf.rewrite->used; i++) {
	pcre *match;
	const char *pattern;
	size_t pattern_len;
	int n;
	rewrite_rule *rule = p->conf.rewrite->ptr[i];
	# define N 10
	int ovec[N * 3];

	match = rule->key;
	pattern = rule->value->ptr;
	pattern_len = rule->value->used - 1;

	if ((n = pcre_exec(match, NULL, 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(con->request.uri);

	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(con->request.uri, pattern + start, end - start);

	if (pattern[k] == '$') {
	/* n is always > 0 */
	if (num < (size_t)n) {
	buffer_append_string(con->request.uri, list[num]);
	}
	} else if (p->conf.context == NULL) {
	/* we have no context, we are global */
	log_error_write(srv, __FILE__, __LINE__, "sb",
	"used a redirect containing a %[0-9]+ in the global scope, ignored:",
	rule->value);

	} else {
	config_append_cond_match_buffer(con, p->conf.context, con->request.uri, num);
	}

	k++;
	start = k + 1;
	}
	}

	buffer_append_string_len(con->request.uri, pattern + start, pattern_len - start);

	pcre_free(list);

	hctx = handler_ctx_init();

	con->plugin_ctx[p->id] = hctx;

	if (rule->once) hctx->state = REWRITE_STATE_FINISHED;

	return HANDLER_COMEBACK;
	}
	}
	#undef N

	#else
	UNUSED(srv);
	UNUSED(con);
	UNUSED(p_d);
	#endif

	return HANDLER_GO_ON;
	}

	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->set_defaults = mod_rewrite_set_defaults;
	p->cleanup = mod_rewrite_free;
	p->connection_reset = mod_rewrite_con_reset;

	p->data = NULL;

	return 0;
	}