451 lines
10 KiB
C
451 lines
10 KiB
C
#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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#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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#ifdef HAVE_PCRE_H
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pcre *key;
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#endif
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buffer *value;
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int once;
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} rewrite_rule;
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typedef struct {
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rewrite_rule **ptr;
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size_t used;
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size_t size;
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} rewrite_rule_buffer;
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typedef struct {
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rewrite_rule_buffer *rewrite;
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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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enum { REWRITE_STATE_UNSET, REWRITE_STATE_FINISHED} state;
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int loops;
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} handler_ctx;
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typedef struct {
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PLUGIN_DATA;
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buffer *match_buf;
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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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static handler_ctx * handler_ctx_init() {
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handler_ctx * hctx;
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hctx = calloc(1, sizeof(*hctx));
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hctx->state = REWRITE_STATE_UNSET;
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hctx->loops = 0;
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return hctx;
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}
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static void handler_ctx_free(handler_ctx *hctx) {
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free(hctx);
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}
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rewrite_rule_buffer *rewrite_rule_buffer_init(void) {
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rewrite_rule_buffer *kvb;
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kvb = calloc(1, sizeof(*kvb));
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return kvb;
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}
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int rewrite_rule_buffer_append(rewrite_rule_buffer *kvb, buffer *key, buffer *value, int once) {
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#ifdef HAVE_PCRE_H
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size_t i;
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const char *errptr;
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int erroff;
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if (!key) return -1;
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if (kvb->size == 0) {
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kvb->size = 4;
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kvb->used = 0;
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kvb->ptr = malloc(kvb->size * sizeof(*kvb->ptr));
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for(i = 0; i < kvb->size; i++) {
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kvb->ptr[i] = calloc(1, sizeof(**kvb->ptr));
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}
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} else if (kvb->used == kvb->size) {
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kvb->size += 4;
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kvb->ptr = realloc(kvb->ptr, kvb->size * sizeof(*kvb->ptr));
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for(i = kvb->used; i < kvb->size; i++) {
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kvb->ptr[i] = calloc(1, sizeof(**kvb->ptr));
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}
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}
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if (NULL == (kvb->ptr[kvb->used]->key = pcre_compile(key->ptr,
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0, &errptr, &erroff, NULL))) {
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return -1;
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}
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kvb->ptr[kvb->used]->value = buffer_init();
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buffer_copy_string_buffer(kvb->ptr[kvb->used]->value, value);
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kvb->ptr[kvb->used]->once = once;
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kvb->used++;
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return 0;
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#else
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UNUSED(kvb);
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UNUSED(value);
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UNUSED(once);
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UNUSED(key);
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return -1;
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#endif
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}
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void rewrite_rule_buffer_free(rewrite_rule_buffer *kvb) {
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#ifdef HAVE_PCRE_H
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size_t i;
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for (i = 0; i < kvb->size; i++) {
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if (kvb->ptr[i]->key) pcre_free(kvb->ptr[i]->key);
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if (kvb->ptr[i]->value) buffer_free(kvb->ptr[i]->value);
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free(kvb->ptr[i]);
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}
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if (kvb->ptr) free(kvb->ptr);
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#endif
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free(kvb);
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}
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INIT_FUNC(mod_rewrite_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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return p;
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}
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FREE_FUNC(mod_rewrite_free) {
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plugin_data *p = p_d;
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UNUSED(srv);
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if (!p) return HANDLER_GO_ON;
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buffer_free(p->match_buf);
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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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rewrite_rule_buffer_free(s->rewrite);
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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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free(p);
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return HANDLER_GO_ON;
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}
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static int parse_config_entry(server *srv, plugin_config *s, array *ca, const char *option, int once) {
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data_unset *du;
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if (NULL != (du = array_get_element(ca, option))) {
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data_array *da = (data_array *)du;
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size_t j;
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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: ", option, "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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option,
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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 != rewrite_rule_buffer_append(s->rewrite,
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((data_string *)(da->value->data[j]))->key,
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((data_string *)(da->value->data[j]))->value,
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once)) {
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#ifdef HAVE_PCRE_H
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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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#else
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log_error_write(srv, __FILE__, __LINE__, "s",
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"pcre support is missing, please install libpcre and the headers");
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#endif
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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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SETDEFAULTS_FUNC(mod_rewrite_set_defaults) {
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plugin_data *p = p_d;
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size_t i = 0;
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config_values_t cv[] = {
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{ "url.rewrite-repeat", NULL, T_CONFIG_LOCAL, T_CONFIG_SCOPE_CONNECTION }, /* 0 */
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{ "url.rewrite-once", NULL, T_CONFIG_LOCAL, T_CONFIG_SCOPE_CONNECTION }, /* 1 */
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/* old names, still supported
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*
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* url.rewrite remapped to url.rewrite-once
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* url.rewrite-final is url.rewrite-once
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*
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*/
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{ "url.rewrite", NULL, T_CONFIG_LOCAL, T_CONFIG_SCOPE_CONNECTION }, /* 2 */
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{ "url.rewrite-final", NULL, T_CONFIG_LOCAL, T_CONFIG_SCOPE_CONNECTION }, /* 3 */
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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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array *ca;
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s = calloc(1, sizeof(plugin_config));
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s->rewrite = rewrite_rule_buffer_init();
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cv[0].destination = s->rewrite;
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cv[1].destination = s->rewrite;
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cv[2].destination = s->rewrite;
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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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parse_config_entry(srv, s, ca, "url.rewrite-once", 1);
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parse_config_entry(srv, s, ca, "url.rewrite-final", 1);
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parse_config_entry(srv, s, ca, "url.rewrite", 1);
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parse_config_entry(srv, s, ca, "url.rewrite-repeat", 0);
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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_rewrite_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.rewrite = s->rewrite;
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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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if (COMP_HTTP_URL == dc->comp) continue;
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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 (buffer_is_equal_string(du->key, CONST_STR_LEN("url.rewrite"))) {
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p->conf.rewrite = s->rewrite;
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p->conf.context = dc;
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} else if (buffer_is_equal_string(du->key, CONST_STR_LEN("url.rewrite-once"))) {
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p->conf.rewrite = s->rewrite;
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p->conf.context = dc;
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} else if (buffer_is_equal_string(du->key, CONST_STR_LEN("url.rewrite-repeat"))) {
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p->conf.rewrite = s->rewrite;
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p->conf.context = dc;
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} else if (buffer_is_equal_string(du->key, CONST_STR_LEN("url.rewrite-final"))) {
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p->conf.rewrite = s->rewrite;
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p->conf.context = dc;
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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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URIHANDLER_FUNC(mod_rewrite_con_reset) {
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plugin_data *p = p_d;
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UNUSED(srv);
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if (con->plugin_ctx[p->id]) {
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handler_ctx_free(con->plugin_ctx[p->id]);
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con->plugin_ctx[p->id] = NULL;
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}
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return HANDLER_GO_ON;
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}
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URIHANDLER_FUNC(mod_rewrite_uri_handler) {
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#ifdef HAVE_PCRE_H
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plugin_data *p = p_d;
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size_t i;
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handler_ctx *hctx;
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/*
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* REWRITE URL
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*
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* e.g. rewrite /base/ to /index.php?section=base
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*
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*/
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if (con->plugin_ctx[p->id]) {
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hctx = con->plugin_ctx[p->id];
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if (hctx->loops++ > 100) {
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log_error_write(srv, __FILE__, __LINE__, "s",
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"ENDLESS LOOP IN rewrite-rule DETECTED ... aborting request, perhaps you want to use url.rewrite-once instead of url.rewrite-repeat");
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return HANDLER_ERROR;
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}
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if (hctx->state == REWRITE_STATE_FINISHED) return HANDLER_GO_ON;
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}
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mod_rewrite_patch_connection(srv, con, p);
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if (!p->conf.rewrite) return HANDLER_GO_ON;
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buffer_copy_string_buffer(p->match_buf, con->request.uri);
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for (i = 0; i < p->conf.rewrite->used; i++) {
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pcre *match;
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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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rewrite_rule *rule = p->conf.rewrite->ptr[i];
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# define N 10
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int ovec[N * 3];
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match = rule->key;
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pattern = rule->value->ptr;
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pattern_len = rule->value->used - 1;
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if ((n = pcre_exec(match, NULL, 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 $[0-9] */
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buffer_reset(con->request.uri);
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start = 0; end = pattern_len;
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for (k = 0; k < pattern_len; k++) {
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if ((pattern[k] == '$' || 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(con->request.uri, 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(con->request.uri, list[num]);
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}
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} else {
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config_append_cond_match_buffer(con, p->conf.context, con->request.uri, 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(con->request.uri, pattern + start, pattern_len - start);
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pcre_free(list);
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hctx = handler_ctx_init();
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con->plugin_ctx[p->id] = hctx;
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if (rule->once) hctx->state = REWRITE_STATE_FINISHED;
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return HANDLER_COMEBACK;
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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_d);
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#endif
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return HANDLER_GO_ON;
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}
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int mod_rewrite_plugin_init(plugin *p) {
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p->version = LIGHTTPD_VERSION_ID;
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p->name = buffer_init_string("rewrite");
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p->init = mod_rewrite_init;
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/* it has to stay _raw as we are matching on uri + querystring
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*/
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p->handle_uri_raw = mod_rewrite_uri_handler;
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p->set_defaults = mod_rewrite_set_defaults;
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p->cleanup = mod_rewrite_free;
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p->connection_reset = mod_rewrite_con_reset;
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p->data = NULL;
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return 0;
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}
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