485 lines
11 KiB
C
485 lines
11 KiB
C
#include <ctype.h>
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#include <stdlib.h>
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#include <stdio.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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#include "stat_cache.h"
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#include "etag.h"
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#include "http_chunk.h"
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#include "response.h"
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/**
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* this is a staticfile for a lighttpd plugin
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*
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*/
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/* plugin config for all request/connections */
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typedef struct {
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array *exclude_ext;
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} plugin_config;
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typedef struct {
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PLUGIN_DATA;
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buffer *range_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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/* init the plugin data */
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INIT_FUNC(mod_staticfile_init) {
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plugin_data *p;
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p = calloc(1, sizeof(*p));
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p->range_buf = buffer_init();
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return p;
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}
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/* detroy the plugin data */
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FREE_FUNC(mod_staticfile_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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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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array_free(s->exclude_ext);
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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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buffer_free(p->range_buf);
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free(p);
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return HANDLER_GO_ON;
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}
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/* handle plugin config and check values */
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SETDEFAULTS_FUNC(mod_staticfile_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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{ "static-file.exclude-extensions", NULL, T_CONFIG_ARRAY, T_CONFIG_SCOPE_CONNECTION }, /* 0 */
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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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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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s = calloc(1, sizeof(plugin_config));
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s->exclude_ext = array_init();
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cv[0].destination = s->exclude_ext;
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p->config_storage[i] = s;
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if (0 != config_insert_values_global(srv, ((data_config *)srv->config_context->data[i])->value, cv)) {
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return HANDLER_ERROR;
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}
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}
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return HANDLER_GO_ON;
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}
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#define PATCH(x) \
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p->conf.x = s->x;
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static int mod_staticfile_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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PATCH(exclude_ext);
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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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/* 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("static-file.exclude-extensions"))) {
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PATCH(exclude_ext);
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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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#undef PATCH
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static int http_response_parse_range(server *srv, connection *con, plugin_data *p) {
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int multipart = 0;
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int error;
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off_t start, end;
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const char *s, *minus;
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char *boundary = "fkj49sn38dcn3";
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data_string *ds;
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stat_cache_entry *sce = NULL;
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buffer *content_type = NULL;
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if (HANDLER_ERROR == stat_cache_get_entry(srv, con, con->physical.path, &sce)) {
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SEGFAULT();
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}
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start = 0;
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end = sce->st.st_size - 1;
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con->response.content_length = 0;
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if (NULL != (ds = (data_string *)array_get_element(con->response.headers, "Content-Type"))) {
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content_type = ds->value;
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}
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for (s = con->request.http_range, error = 0;
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!error && *s && NULL != (minus = strchr(s, '-')); ) {
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char *err;
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off_t la, le;
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if (s == minus) {
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/* -<stop> */
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le = strtoll(s, &err, 10);
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if (le == 0) {
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/* RFC 2616 - 14.35.1 */
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con->http_status = 416;
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error = 1;
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} else if (*err == '\0') {
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/* end */
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s = err;
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end = sce->st.st_size - 1;
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start = sce->st.st_size + le;
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} else if (*err == ',') {
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multipart = 1;
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s = err + 1;
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end = sce->st.st_size - 1;
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start = sce->st.st_size + le;
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} else {
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error = 1;
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}
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} else if (*(minus+1) == '\0' || *(minus+1) == ',') {
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/* <start>- */
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la = strtoll(s, &err, 10);
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if (err == minus) {
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/* ok */
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if (*(err + 1) == '\0') {
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s = err + 1;
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end = sce->st.st_size - 1;
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start = la;
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} else if (*(err + 1) == ',') {
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multipart = 1;
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s = err + 2;
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end = sce->st.st_size - 1;
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start = la;
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} else {
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error = 1;
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}
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} else {
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/* error */
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error = 1;
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}
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} else {
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/* <start>-<stop> */
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la = strtoll(s, &err, 10);
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if (err == minus) {
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le = strtoll(minus+1, &err, 10);
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/* RFC 2616 - 14.35.1 */
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if (la > le) {
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error = 1;
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}
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if (*err == '\0') {
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/* ok, end*/
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s = err;
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end = le;
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start = la;
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} else if (*err == ',') {
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multipart = 1;
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s = err + 1;
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end = le;
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start = la;
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} else {
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/* error */
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error = 1;
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}
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} else {
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/* error */
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error = 1;
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}
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}
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if (!error) {
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if (start < 0) start = 0;
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/* RFC 2616 - 14.35.1 */
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if (end > sce->st.st_size - 1) end = sce->st.st_size - 1;
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if (start > sce->st.st_size - 1) {
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error = 1;
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con->http_status = 416;
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}
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}
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if (!error) {
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if (multipart) {
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/* write boundary-header */
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buffer *b;
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b = chunkqueue_get_append_buffer(con->write_queue);
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buffer_copy_string(b, "\r\n--");
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buffer_append_string(b, boundary);
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/* write Content-Range */
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buffer_append_string(b, "\r\nContent-Range: bytes ");
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buffer_append_off_t(b, start);
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buffer_append_string(b, "-");
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buffer_append_off_t(b, end);
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buffer_append_string(b, "/");
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buffer_append_off_t(b, sce->st.st_size);
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buffer_append_string(b, "\r\nContent-Type: ");
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buffer_append_string_buffer(b, content_type);
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/* write END-OF-HEADER */
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buffer_append_string(b, "\r\n\r\n");
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con->response.content_length += b->used - 1;
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}
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chunkqueue_append_file(con->write_queue, con->physical.path, start, end - start + 1);
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con->response.content_length += end - start + 1;
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}
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}
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/* something went wrong */
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if (error) return -1;
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if (multipart) {
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/* add boundary end */
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buffer *b;
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b = chunkqueue_get_append_buffer(con->write_queue);
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buffer_copy_string_len(b, "\r\n--", 4);
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buffer_append_string(b, boundary);
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buffer_append_string_len(b, "--\r\n", 4);
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con->response.content_length += b->used - 1;
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/* set header-fields */
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buffer_copy_string(p->range_buf, "multipart/byteranges; boundary=");
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buffer_append_string(p->range_buf, boundary);
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/* overwrite content-type */
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response_header_overwrite(srv, con, CONST_STR_LEN("Content-Type"), CONST_BUF_LEN(p->range_buf));
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} else {
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/* add Content-Range-header */
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buffer_copy_string(p->range_buf, "bytes ");
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buffer_append_off_t(p->range_buf, start);
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buffer_append_string(p->range_buf, "-");
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buffer_append_off_t(p->range_buf, end);
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buffer_append_string(p->range_buf, "/");
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buffer_append_off_t(p->range_buf, sce->st.st_size);
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response_header_insert(srv, con, CONST_STR_LEN("Content-Range"), CONST_BUF_LEN(p->range_buf));
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}
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/* ok, the file is set-up */
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return 0;
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}
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URIHANDLER_FUNC(mod_staticfile_subrequest) {
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plugin_data *p = p_d;
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size_t k;
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int s_len;
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stat_cache_entry *sce = NULL;
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buffer *mtime;
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data_string *ds;
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/* someone else has done a decision for us */
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if (con->http_status != 0) return HANDLER_GO_ON;
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if (con->uri.path->used == 0) return HANDLER_GO_ON;
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if (con->physical.path->used == 0) return HANDLER_GO_ON;
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/* someone else has handled this request */
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if (con->mode != DIRECT) return HANDLER_GO_ON;
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/* we only handle GET, POST and HEAD */
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switch(con->request.http_method) {
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case HTTP_METHOD_GET:
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case HTTP_METHOD_POST:
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case HTTP_METHOD_HEAD:
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break;
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default:
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return HANDLER_GO_ON;
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}
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mod_staticfile_patch_connection(srv, con, p);
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s_len = con->uri.path->used - 1;
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/* ignore certain extensions */
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for (k = 0; k < p->conf.exclude_ext->used; k++) {
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int ct_len;
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ds = (data_string *)p->conf.exclude_ext->data[k];
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ct_len = ds->value->used - 1;
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if (ct_len > s_len) continue;
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if (ds->value->used == 0) continue;
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if (0 == strncmp(con->uri.path->ptr + s_len - ct_len, ds->value->ptr, ct_len)) {
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return HANDLER_GO_ON;
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}
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}
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if (con->conf.log_request_handling) {
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log_error_write(srv, __FILE__, __LINE__, "s", "-- handling file as static file");
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}
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if (HANDLER_ERROR == stat_cache_get_entry(srv, con, con->physical.path, &sce)) {
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con->http_status = 403;
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log_error_write(srv, __FILE__, __LINE__, "sbsb",
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"not a regular file:", con->uri.path,
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"->", con->physical.path);
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return HANDLER_FINISHED;
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}
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/* we only handline regular files */
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if (!S_ISREG(sce->st.st_mode)) {
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con->http_status = 404;
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if (con->conf.log_file_not_found) {
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log_error_write(srv, __FILE__, __LINE__, "sbsb",
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"not a regular file:", con->uri.path,
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"->", sce->name);
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}
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return HANDLER_FINISHED;
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}
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/* mod_compress might set several data directly, don't overwrite them */
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/* set response content-type, if not set already */
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if (NULL == array_get_element(con->response.headers, "Content-Type")) {
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if (buffer_is_empty(sce->content_type)) {
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response_header_overwrite(srv, con, CONST_STR_LEN("Content-Type"), CONST_STR_LEN("application/octet-stream"));
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} else {
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response_header_overwrite(srv, con, CONST_STR_LEN("Content-Type"), CONST_BUF_LEN(sce->content_type));
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}
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}
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if (NULL == array_get_element(con->response.headers, "ETag")) {
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/* generate e-tag */
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etag_mutate(con->physical.etag, sce->etag);
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response_header_overwrite(srv, con, CONST_STR_LEN("ETag"), CONST_BUF_LEN(con->physical.etag));
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}
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response_header_overwrite(srv, con, CONST_STR_LEN("Accept-Ranges"), CONST_STR_LEN("bytes"));
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/* prepare header */
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if (NULL == (ds = (data_string *)array_get_element(con->response.headers, "Last-Modified"))) {
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mtime = strftime_cache_get(srv, sce->st.st_mtime);
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response_header_overwrite(srv, con, CONST_STR_LEN("Last-Modified"), CONST_BUF_LEN(mtime));
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} else {
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mtime = ds->value;
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}
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if (HANDLER_FINISHED == http_response_handle_cachable(srv, con, mtime)) {
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return HANDLER_FINISHED;
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} else if (con->request.http_range && con->conf.range_requests) {
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/* content prepared, I'm done */
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con->file_finished = 1;
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if (0 == http_response_parse_range(srv, con, p)) {
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con->http_status = 206;
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}
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return HANDLER_FINISHED;
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}
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/* if we are still here, prepare body */
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/* we add it here for all requests
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* the HEAD request will drop it afterwards again
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*/
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http_chunk_append_file(srv, con, con->physical.path, 0, sce->st.st_size);
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con->file_finished = 1;
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return HANDLER_FINISHED;
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}
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/* this function is called at dlopen() time and inits the callbacks */
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int mod_staticfile_plugin_init(plugin *p) {
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p->version = LIGHTTPD_VERSION_ID;
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p->name = buffer_init_string("staticfile");
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p->init = mod_staticfile_init;
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p->handle_subrequest_start = mod_staticfile_subrequest;
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p->set_defaults = mod_staticfile_set_defaults;
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p->cleanup = mod_staticfile_free;
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p->data = NULL;
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return 0;
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}
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