lighttpd 1.4.x https://www.lighttpd.net/
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#include "first.h"
#include "base.h"
#include "log.h"
#include "buffer.h"
#include "plugin.h"
#include "stat_cache.h"
#include <ctype.h>
#include <stdlib.h>
#include <string.h>
#ifdef HAVE_PCRE_H
typedef struct {
pcre *key;
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;
rewrite_rule_buffer *rewrite_NF;
data_config *context, *context_NF; /* 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(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);
}
static rewrite_rule_buffer *rewrite_rule_buffer_init(void) {
rewrite_rule_buffer *kvb;
kvb = calloc(1, sizeof(*kvb));
return kvb;
}
static int rewrite_rule_buffer_append(rewrite_rule_buffer *kvb, buffer *key, buffer *value, int once) {
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_buffer(kvb->ptr[kvb->used]->value, value);
kvb->ptr[kvb->used]->once = once;
kvb->used++;
return 0;
}
static void rewrite_rule_buffer_free(rewrite_rule_buffer *kvb) {
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);
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];
if (NULL == s) continue;
rewrite_rule_buffer_free(s->rewrite);
rewrite_rule_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, rewrite_rule_buffer *kvb, const char *option, int once) {
data_unset *du;
if (NULL != (du = array_get_element(ca, option))) {
data_array *da;
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(kvb,
((data_string *)(da->value->data[j]))->key,
((data_string *)(da->value->data[j]))->value,
once)) {
log_error_write(srv, __FILE__, __LINE__, "sb",
"pcre-compile failed for", da->value->data[j]->key);
return HANDLER_ERROR;
}
}
}
return 0;
}
#else
static int parse_config_entry(server *srv, array *ca, const char *option) {
static int logged_message = 0;
if (logged_message) return 0;
if (NULL != array_get_element(ca, option)) {
logged_message = 1;
log_error_write(srv, __FILE__, __LINE__, "s",
"pcre support is missing, please install libpcre and the headers");
}
return 0;
}
#endif
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 }
};
#ifdef HAVE_PCRE_H
plugin_data *p = p_d;
if (!p) return HANDLER_ERROR;
/* 0 */
p->config_storage = calloc(1, srv->config_context->used * sizeof(plugin_config *));
#else
UNUSED(p_d);
#endif
for (i = 0; i < srv->config_context->used; i++) {
data_config const* config = (data_config const*)srv->config_context->data[i];
#ifdef HAVE_PCRE_H
plugin_config *s;
s = calloc(1, sizeof(plugin_config));
s->rewrite = rewrite_rule_buffer_init();
s->rewrite_NF = rewrite_rule_buffer_init();
p->config_storage[i] = s;
#endif
if (0 != config_insert_values_global(srv, config->value, cv, i == 0 ? T_CONFIG_SCOPE_SERVER : T_CONFIG_SCOPE_CONNECTION)) {
return HANDLER_ERROR;
}
#ifndef HAVE_PCRE_H
# define parse_config_entry(srv, ca, x, option, y) parse_config_entry(srv, ca, option)
#endif
parse_config_entry(srv, config->value, s->rewrite, "url.rewrite-once", 1);
parse_config_entry(srv, config->value, s->rewrite, "url.rewrite-final", 1);
parse_config_entry(srv, config->value, s->rewrite_NF, "url.rewrite-if-not-file", 1);
parse_config_entry(srv, config->value, s->rewrite_NF, "url.rewrite-repeat-if-not-file", 0);
parse_config_entry(srv, config->value, s->rewrite, "url.rewrite", 1);
parse_config_entry(srv, config->value, s->rewrite, "url.rewrite-repeat", 0);
}
return HANDLER_GO_ON;
}
#ifdef HAVE_PCRE_H
#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;
/* 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;
} else if (buffer_is_equal_string(du->key, CONST_STR_LEN("url.rewrite-once"))) {
PATCH(rewrite);
p->conf.context = dc;
} else if (buffer_is_equal_string(du->key, CONST_STR_LEN("url.rewrite-repeat"))) {
PATCH(rewrite);
p->conf.context = dc;
} else if (buffer_is_equal_string(du->key, CONST_STR_LEN("url.rewrite-if-not-file"))) {
PATCH(rewrite_NF);
p->conf.context_NF = dc;
} 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;
} else if (buffer_is_equal_string(du->key, CONST_STR_LEN("url.rewrite-final"))) {
PATCH(rewrite);
p->conf.context = dc;
}
}
}
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, rewrite_rule_buffer *kvb) {
size_t i;
handler_ctx *hctx;
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;
}
buffer_copy_buffer(p->match_buf, con->request.uri);
for (i = 0; i < kvb->used; i++) {
pcre *match;
const char *pattern;
size_t pattern_len;
int n;
rewrite_rule *rule = kvb->ptr[i];
# define N 10
int ovec[N * 3];
match = rule->key;
pattern = rule->value->ptr;
pattern_len = buffer_string_length(rule->value);
if ((n = pcre_exec(match, NULL, CONST_BUF_LEN(p->match_buf), 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 if (0 == pattern_len) {
/* short-circuit if blank replacement pattern
* (do not attempt to match against remaining rewrite rules) */
return HANDLER_GO_ON;
} else {
const char **list;
size_t start;
size_t k;
/* it matched */
pcre_get_substring_list(p->match_buf->ptr, ovec, n, &list);
/* search for $[0-9] */
buffer_reset(con->request.uri);
start = 0;
for (k = 0; k+1 < pattern_len; k++) {
if (pattern[k] == '$' || pattern[k] == '%') {
/* got one */
size_t num = pattern[k + 1] - '0';
buffer_append_string_len(con->request.uri, pattern + start, k - start);
if (!isdigit((unsigned char)pattern[k + 1])) {
/* enable escape: "%%" => "%", "%a" => "%a", "$$" => "$" */
buffer_append_string_len(con->request.uri, pattern+k, pattern[k] == pattern[k+1] ? 1 : 2);
} else if (pattern[k] == '$') {
/* 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);
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 (rule->once) hctx->state = REWRITE_STATE_FINISHED;
return HANDLER_COMEBACK;
}
#undef N
}
return HANDLER_GO_ON;
}
URIHANDLER_FUNC(mod_rewrite_physical) {
plugin_data *p = p_d;
handler_t r;
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) 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;
}
switch(r = process_rewrite_rules(srv, con, p, p->conf.rewrite_NF)) {
case HANDLER_COMEBACK:
buffer_reset(con->physical.path);
default:
return r;
}
return HANDLER_GO_ON;
}
URIHANDLER_FUNC(mod_rewrite_uri_handler) {
plugin_data *p = p_d;
mod_rewrite_patch_connection(srv, con, p);
if (!p->conf.rewrite) return HANDLER_GO_ON;
return process_rewrite_rules(srv, con, p, p->conf.rewrite);
}
#endif
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");
#ifdef HAVE_PCRE_H
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;
#endif
p->set_defaults = mod_rewrite_set_defaults;
p->data = NULL;
return 0;
}