lighttpd 1.4.x https://www.lighttpd.net/
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#include "base.h"
#include "log.h"
#include "buffer.h"
#include "response.h"
#include "plugin.h"
#include "stat_cache.h"
#include <ctype.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
/**
* this is a expire module for a lighttpd
*
* set 'Expires:' HTTP Headers on demand
*/
/* plugin config for all request/connections */
typedef struct {
array *expire_url;
} plugin_config;
typedef struct {
PLUGIN_DATA;
buffer *expire_tstmp;
plugin_config **config_storage;
plugin_config conf;
} plugin_data;
/* init the plugin data */
INIT_FUNC(mod_expire_init) {
plugin_data *p;
p = calloc(1, sizeof(*p));
p->expire_tstmp = buffer_init();
buffer_string_prepare_copy(p->expire_tstmp, 255);
return p;
}
/* detroy the plugin data */
FREE_FUNC(mod_expire_free) {
plugin_data *p = p_d;
UNUSED(srv);
if (!p) return HANDLER_GO_ON;
buffer_free(p->expire_tstmp);
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;
array_free(s->expire_url);
free(s);
}
free(p->config_storage);
}
free(p);
return HANDLER_GO_ON;
}
static int mod_expire_get_offset(server *srv, plugin_data *p, buffer *expire, time_t *offset) {
char *ts;
int type = -1;
time_t retts = 0;
UNUSED(p);
/*
* parse
*
* '(access|now|modification) [plus] {<num> <type>}*'
*
* e.g. 'access 1 years'
*/
if (buffer_string_is_empty(expire)) {
log_error_write(srv, __FILE__, __LINE__, "s",
"empty:");
return -1;
}
ts = expire->ptr;
if (0 == strncmp(ts, "access ", 7)) {
type = 0;
ts += 7;
} else if (0 == strncmp(ts, "now ", 4)) {
type = 0;
ts += 4;
} else if (0 == strncmp(ts, "modification ", 13)) {
type = 1;
ts += 13;
} else {
/* invalid type-prefix */
log_error_write(srv, __FILE__, __LINE__, "ss",
"invalid <base>:", ts);
return -1;
}
if (0 == strncmp(ts, "plus ", 5)) {
/* skip the optional plus */
ts += 5;
}
/* the rest is just <number> (years|months|weeks|days|hours|minutes|seconds) */
while (1) {
char *space, *err;
int num;
if (NULL == (space = strchr(ts, ' '))) {
log_error_write(srv, __FILE__, __LINE__, "ss",
"missing space after <num>:", ts);
return -1;
}
num = strtol(ts, &err, 10);
if (*err != ' ') {
log_error_write(srv, __FILE__, __LINE__, "ss",
"missing <type> after <num>:", ts);
return -1;
}
ts = space + 1;
if (NULL != (space = strchr(ts, ' '))) {
int slen;
/* */
slen = space - ts;
if (slen == 5 &&
0 == strncmp(ts, "years", slen)) {
num *= 60 * 60 * 24 * 30 * 12;
} else if (slen == 6 &&
0 == strncmp(ts, "months", slen)) {
num *= 60 * 60 * 24 * 30;
} else if (slen == 5 &&
0 == strncmp(ts, "weeks", slen)) {
num *= 60 * 60 * 24 * 7;
} else if (slen == 4 &&
0 == strncmp(ts, "days", slen)) {
num *= 60 * 60 * 24;
} else if (slen == 5 &&
0 == strncmp(ts, "hours", slen)) {
num *= 60 * 60;
} else if (slen == 7 &&
0 == strncmp(ts, "minutes", slen)) {
num *= 60;
} else if (slen == 7 &&
0 == strncmp(ts, "seconds", slen)) {
num *= 1;
} else {
log_error_write(srv, __FILE__, __LINE__, "ss",
"unknown type:", ts);
return -1;
}
retts += num;
ts = space + 1;
} else {
if (0 == strcmp(ts, "years")) {
num *= 60 * 60 * 24 * 30 * 12;
} else if (0 == strcmp(ts, "months")) {
num *= 60 * 60 * 24 * 30;
} else if (0 == strcmp(ts, "weeks")) {
num *= 60 * 60 * 24 * 7;
} else if (0 == strcmp(ts, "days")) {
num *= 60 * 60 * 24;
} else if (0 == strcmp(ts, "hours")) {
num *= 60 * 60;
} else if (0 == strcmp(ts, "minutes")) {
num *= 60;
} else if (0 == strcmp(ts, "seconds")) {
num *= 1;
} else {
log_error_write(srv, __FILE__, __LINE__, "ss",
"unknown type:", ts);
return -1;
}
retts += num;
break;
}
}
if (offset != NULL) *offset = retts;
return type;
}
/* handle plugin config and check values */
SETDEFAULTS_FUNC(mod_expire_set_defaults) {
plugin_data *p = p_d;
size_t i = 0, k;
config_values_t cv[] = {
{ "expire.url", NULL, T_CONFIG_ARRAY, T_CONFIG_SCOPE_CONNECTION }, /* 0 */
{ NULL, NULL, T_CONFIG_UNSET, T_CONFIG_SCOPE_UNSET }
};
if (!p) return HANDLER_ERROR;
p->config_storage = calloc(1, srv->config_context->used * sizeof(plugin_config *));
for (i = 0; i < srv->config_context->used; i++) {
data_config const* config = (data_config const*)srv->config_context->data[i];
plugin_config *s;
s = calloc(1, sizeof(plugin_config));
s->expire_url = array_init();
cv[0].destination = s->expire_url;
p->config_storage[i] = s;
if (0 != config_insert_values_global(srv, config->value, cv, i == 0 ? T_CONFIG_SCOPE_SERVER : T_CONFIG_SCOPE_CONNECTION)) {
return HANDLER_ERROR;
}
for (k = 0; k < s->expire_url->used; k++) {
data_string *ds = (data_string *)s->expire_url->data[k];
/* parse lines */
if (-1 == mod_expire_get_offset(srv, p, ds->value, NULL)) {
log_error_write(srv, __FILE__, __LINE__, "sb",
"parsing expire.url failed:", ds->value);
return HANDLER_ERROR;
}
}
}
return HANDLER_GO_ON;
}
#define PATCH(x) \
p->conf.x = s->x;
static int mod_expire_patch_connection(server *srv, connection *con, plugin_data *p) {
size_t i, j;
plugin_config *s = p->config_storage[0];
PATCH(expire_url);
/* 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("expire.url"))) {
PATCH(expire_url);
}
}
}
return 0;
}
#undef PATCH
URIHANDLER_FUNC(mod_expire_path_handler) {
plugin_data *p = p_d;
int s_len;
size_t k;
if (buffer_is_empty(con->uri.path)) return HANDLER_GO_ON;
mod_expire_patch_connection(srv, con, p);
s_len = buffer_string_length(con->uri.path);
for (k = 0; k < p->conf.expire_url->used; k++) {
data_string *ds = (data_string *)p->conf.expire_url->data[k];
int ct_len = buffer_string_length(ds->key);
if (ct_len > s_len) continue;
if (buffer_is_empty(ds->key)) continue;
if (0 == strncmp(con->uri.path->ptr, ds->key->ptr, ct_len)) {
time_t ts, expires;
stat_cache_entry *sce = NULL;
/* if stat fails => sce == NULL, ignore return value */
(void) stat_cache_get_entry(srv, con, con->physical.path, &sce);
switch(mod_expire_get_offset(srv, p, ds->value, &ts)) {
case 0:
/* access */
expires = (ts + srv->cur_ts);
break;
case 1:
/* modification */
/* can't set modification based expire header if
* mtime is not available
*/
if (NULL == sce) return HANDLER_GO_ON;
expires = (ts + sce->st.st_mtime);
break;
default:
/* -1 is handled at parse-time */
return HANDLER_ERROR;
}
/* expires should be at least srv->cur_ts */
if (expires < srv->cur_ts) expires = srv->cur_ts;
buffer_string_prepare_copy(p->expire_tstmp, 255);
buffer_append_strftime(p->expire_tstmp, "%a, %d %b %Y %H:%M:%S GMT", gmtime(&(expires)));
/* HTTP/1.0 */
response_header_overwrite(srv, con, CONST_STR_LEN("Expires"), CONST_BUF_LEN(p->expire_tstmp));
/* HTTP/1.1 */
buffer_copy_string_len(p->expire_tstmp, CONST_STR_LEN("max-age="));
buffer_append_int(p->expire_tstmp, expires - srv->cur_ts); /* as expires >= srv->cur_ts the difference is >= 0 */
response_header_append(srv, con, CONST_STR_LEN("Cache-Control"), CONST_BUF_LEN(p->expire_tstmp));
return HANDLER_GO_ON;
}
}
/* not found */
return HANDLER_GO_ON;
}
/* this function is called at dlopen() time and inits the callbacks */
int mod_expire_plugin_init(plugin *p);
int mod_expire_plugin_init(plugin *p) {
p->version = LIGHTTPD_VERSION_ID;
p->name = buffer_init_string("expire");
p->init = mod_expire_init;
p->handle_subrequest_start = mod_expire_path_handler;
p->set_defaults = mod_expire_set_defaults;
p->cleanup = mod_expire_free;
p->data = NULL;
return 0;
}