lighttpd 1.4.x https://www.lighttpd.net/
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#include <ctype.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include "base.h"
#include "log.h"
#include "buffer.h"
#include "plugin.h"
#include "stat_cache.h"
#include "etag.h"
#include "http_chunk.h"
#include "response.h"
/**
* this is a staticfile for a lighttpd plugin
*
*/
/* plugin config for all request/connections */
typedef struct {
array *exclude_ext;
} plugin_config;
typedef struct {
PLUGIN_DATA;
buffer *range_buf;
plugin_config **config_storage;
plugin_config conf;
} plugin_data;
/* init the plugin data */
INIT_FUNC(mod_staticfile_init) {
plugin_data *p;
p = calloc(1, sizeof(*p));
p->range_buf = buffer_init();
return p;
}
/* detroy the plugin data */
FREE_FUNC(mod_staticfile_free) {
plugin_data *p = p_d;
UNUSED(srv);
if (!p) return HANDLER_GO_ON;
if (p->config_storage) {
size_t i;
for (i = 0; i < srv->config_context->used; i++) {
plugin_config *s = p->config_storage[i];
array_free(s->exclude_ext);
free(s);
}
free(p->config_storage);
}
buffer_free(p->range_buf);
free(p);
return HANDLER_GO_ON;
}
/* handle plugin config and check values */
SETDEFAULTS_FUNC(mod_staticfile_set_defaults) {
plugin_data *p = p_d;
size_t i = 0;
config_values_t cv[] = {
{ "static-file.exclude-extensions", 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(specific_config *));
for (i = 0; i < srv->config_context->used; i++) {
plugin_config *s;
s = calloc(1, sizeof(plugin_config));
s->exclude_ext = array_init();
cv[0].destination = s->exclude_ext;
p->config_storage[i] = s;
if (0 != config_insert_values_global(srv, ((data_config *)srv->config_context->data[i])->value, cv)) {
return HANDLER_ERROR;
}
}
return HANDLER_GO_ON;
}
#define PATCH(x) \
p->conf.x = s->x;
static int mod_staticfile_patch_connection(server *srv, connection *con, plugin_data *p) {
size_t i, j;
plugin_config *s = p->config_storage[0];
PATCH(exclude_ext);
/* 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("static-file.exclude-extensions"))) {
PATCH(exclude_ext);
}
}
}
return 0;
}
#undef PATCH
static int http_response_parse_range(server *srv, connection *con, plugin_data *p) {
int multipart = 0;
int error;
off_t start, end;
const char *s, *minus;
char *boundary = "fkj49sn38dcn3";
data_string *ds;
stat_cache_entry *sce = NULL;
buffer *content_type = NULL;
if (HANDLER_ERROR == stat_cache_get_entry(srv, con, con->physical.path, &sce)) {
SEGFAULT();
}
start = 0;
end = sce->st.st_size - 1;
con->response.content_length = 0;
if (NULL != (ds = (data_string *)array_get_element(con->response.headers, "Content-Type"))) {
content_type = ds->value;
}
for (s = con->request.http_range, error = 0;
!error && *s && NULL != (minus = strchr(s, '-')); ) {
char *err;
long la, le;
if (s == minus) {
/* -<stop> */
le = strtol(s, &err, 10);
if (le == 0) {
/* RFC 2616 - 14.35.1 */
con->http_status = 416;
error = 1;
} else if (*err == '\0') {
/* end */
s = err;
end = sce->st.st_size - 1;
start = sce->st.st_size + le;
} else if (*err == ',') {
multipart = 1;
s = err + 1;
end = sce->st.st_size - 1;
start = sce->st.st_size + le;
} else {
error = 1;
}
} else if (*(minus+1) == '\0' || *(minus+1) == ',') {
/* <start>- */
la = strtol(s, &err, 10);
if (err == minus) {
/* ok */
if (*(err + 1) == '\0') {
s = err + 1;
end = sce->st.st_size - 1;
start = la;
} else if (*(err + 1) == ',') {
multipart = 1;
s = err + 2;
end = sce->st.st_size - 1;
start = la;
} else {
error = 1;
}
} else {
/* error */
error = 1;
}
} else {
/* <start>-<stop> */
la = strtol(s, &err, 10);
if (err == minus) {
le = strtol(minus+1, &err, 10);
/* RFC 2616 - 14.35.1 */
if (la > le) {
error = 1;
}
if (*err == '\0') {
/* ok, end*/
s = err;
end = le;
start = la;
} else if (*err == ',') {
multipart = 1;
s = err + 1;
end = le;
start = la;
} else {
/* error */
error = 1;
}
} else {
/* error */
error = 1;
}
}
if (!error) {
if (start < 0) start = 0;
/* RFC 2616 - 14.35.1 */
if (end > sce->st.st_size - 1) end = sce->st.st_size - 1;
if (start > sce->st.st_size - 1) {
error = 1;
con->http_status = 416;
}
}
if (!error) {
if (multipart) {
/* write boundary-header */
buffer *b;
b = chunkqueue_get_append_buffer(con->write_queue);
buffer_copy_string(b, "\r\n--");
buffer_append_string(b, boundary);
/* write Content-Range */
buffer_append_string(b, "\r\nContent-Range: bytes ");
buffer_append_off_t(b, start);
buffer_append_string(b, "-");
buffer_append_off_t(b, end);
buffer_append_string(b, "/");
buffer_append_off_t(b, sce->st.st_size);
buffer_append_string(b, "\r\nContent-Type: ");
buffer_append_string_buffer(b, content_type);
/* write END-OF-HEADER */
buffer_append_string(b, "\r\n\r\n");
con->response.content_length += b->used - 1;
}
chunkqueue_append_file(con->write_queue, con->physical.path, start, end - start + 1);
con->response.content_length += end - start + 1;
}
}
/* something went wrong */
if (error) return -1;
if (multipart) {
/* add boundary end */
buffer *b;
b = chunkqueue_get_append_buffer(con->write_queue);
buffer_copy_string_len(b, "\r\n--", 4);
buffer_append_string(b, boundary);
buffer_append_string_len(b, "--\r\n", 4);
con->response.content_length += b->used - 1;
/* set header-fields */
buffer_copy_string(p->range_buf, "multipart/byteranges; boundary=");
buffer_append_string(p->range_buf, boundary);
/* overwrite content-type */
response_header_overwrite(srv, con, CONST_STR_LEN("Content-Type"), CONST_BUF_LEN(p->range_buf));
} else {
/* add Content-Range-header */
buffer_copy_string(p->range_buf, "bytes ");
buffer_append_off_t(p->range_buf, start);
buffer_append_string(p->range_buf, "-");
buffer_append_off_t(p->range_buf, end);
buffer_append_string(p->range_buf, "/");
buffer_append_off_t(p->range_buf, sce->st.st_size);
response_header_insert(srv, con, CONST_STR_LEN("Content-Range"), CONST_BUF_LEN(p->range_buf));
}
/* ok, the file is set-up */
return 0;
}
static buffer * strftime_cache_get(server *srv, time_t last_mod) {
struct tm *tm;
size_t i;
for (i = 0; i < FILE_CACHE_MAX; i++) {
/* found cache-entry */
if (srv->mtime_cache[i].mtime == last_mod) return srv->mtime_cache[i].str;
/* found empty slot */
if (srv->mtime_cache[i].mtime == 0) break;
}
if (i == FILE_CACHE_MAX) {
i = 0;
}
srv->mtime_cache[i].mtime = last_mod;
buffer_prepare_copy(srv->mtime_cache[i].str, 1024);
tm = gmtime(&(srv->mtime_cache[i].mtime));
srv->mtime_cache[i].str->used = strftime(srv->mtime_cache[i].str->ptr,
srv->mtime_cache[i].str->size - 1,
"%a, %d %b %Y %H:%M:%S GMT", tm);
srv->mtime_cache[i].str->used++;
return srv->mtime_cache[i].str;
}
URIHANDLER_FUNC(mod_staticfile_subrequest) {
plugin_data *p = p_d;
size_t k;
int s_len;
buffer *mtime;
stat_cache_entry *sce = NULL;
/* someone else has done a decision for us */
if (con->http_status != 0) return HANDLER_GO_ON;
if (con->uri.path->used == 0) return HANDLER_GO_ON;
if (con->physical.path->used == 0) return HANDLER_GO_ON;
/* someone else has handled this request */
if (con->mode != DIRECT) return HANDLER_GO_ON;
/* we only handle GET, POST and HEAD */
switch(con->request.http_method) {
case HTTP_METHOD_GET:
case HTTP_METHOD_POST:
case HTTP_METHOD_HEAD:
break;
default:
return HANDLER_GO_ON;
}
mod_staticfile_patch_connection(srv, con, p);
s_len = con->uri.path->used - 1;
/* ignore certain extensions */
for (k = 0; k < p->conf.exclude_ext->used; k++) {
data_string *ds = (data_string *)p->conf.exclude_ext->data[k];
int ct_len = ds->value->used - 1;
if (ct_len > s_len) continue;
if (ds->value->used == 0) continue;
if (0 == strncmp(con->uri.path->ptr + s_len - ct_len, ds->value->ptr, ct_len)) {
return HANDLER_GO_ON;
}
}
if (con->conf.log_request_handling) {
log_error_write(srv, __FILE__, __LINE__, "s", "-- handling file as static file");
}
if (HANDLER_ERROR == stat_cache_get_entry(srv, con, con->physical.path, &sce)) {
con->http_status = 403;
log_error_write(srv, __FILE__, __LINE__, "sbsb",
"not a regular file:", con->uri.path,
"->", con->physical.path);
return HANDLER_FINISHED;
}
/* we only handline regular files */
if (!S_ISREG(sce->st.st_mode)) {
con->http_status = 404;
if (con->conf.log_file_not_found) {
log_error_write(srv, __FILE__, __LINE__, "sbsb",
"not a regular file:", con->uri.path,
"->", sce->name);
}
return HANDLER_FINISHED;
}
/* set response content-type */
if (buffer_is_empty(sce->content_type)) {
response_header_overwrite(srv, con, CONST_STR_LEN("Content-Type"), CONST_STR_LEN("application/octet-stream"));
} else {
response_header_overwrite(srv, con, CONST_STR_LEN("Content-Type"), CONST_BUF_LEN(sce->content_type));
}
/* generate e-tag */
etag_mutate(con->physical.etag, sce->etag);
response_header_overwrite(srv, con, CONST_STR_LEN("ETag"), CONST_BUF_LEN(con->physical.etag));
response_header_overwrite(srv, con, CONST_STR_LEN("Accept-Ranges"), CONST_STR_LEN("bytes"));
/* prepare header */
mtime = strftime_cache_get(srv, sce->st.st_mtime);
response_header_overwrite(srv, con, CONST_STR_LEN("Last-Modified"), CONST_BUF_LEN(mtime));
/*
* 14.26 If-None-Match
* [...]
* If none of the entity tags match, then the server MAY perform the
* requested method as if the If-None-Match header field did not exist,
* but MUST also ignore any If-Modified-Since header field(s) in the
* request. That is, if no entity tags match, then the server MUST NOT
* return a 304 (Not Modified) response.
*/
/* last-modified handling */
if (con->request.http_if_none_match) {
if (etag_is_equal(con->physical.etag, con->request.http_if_none_match)) {
if (con->request.http_method == HTTP_METHOD_GET ||
con->request.http_method == HTTP_METHOD_HEAD) {
/* check if etag + last-modified */
if (con->request.http_if_modified_since) {
size_t used_len;
char *semicolon;
if (NULL == (semicolon = strchr(con->request.http_if_modified_since, ';'))) {
used_len = strlen(con->request.http_if_modified_since);
} else {
used_len = semicolon - con->request.http_if_modified_since;
}
if (0 == strncmp(con->request.http_if_modified_since, mtime->ptr, used_len)) {
con->http_status = 304;
return HANDLER_FINISHED;
} else {
char buf[64];
/* convert to timestamp */
if (used_len < sizeof(buf) - 1) {
time_t t;
struct tm tm;
strncpy(buf, con->request.http_if_modified_since, used_len);
buf[used_len] = '\0';
strptime(buf, "%a, %d %b %Y %H:%M:%S GMT", &tm);
if (-1 != (t = mktime(&tm)) &&
t <= sce->st.st_mtime) {
con->http_status = 304;
return HANDLER_FINISHED;
}
} else {
log_error_write(srv, __FILE__, __LINE__, "ss",
con->request.http_if_modified_since, buf);
con->http_status = 412;
return HANDLER_FINISHED;
}
}
} else {
con->http_status = 304;
return HANDLER_FINISHED;
}
} else {
con->http_status = 412;
return HANDLER_FINISHED;
}
}
} else if (con->request.http_if_modified_since) {
size_t used_len;
char *semicolon;
if (NULL == (semicolon = strchr(con->request.http_if_modified_since, ';'))) {
used_len = strlen(con->request.http_if_modified_since);
} else {
used_len = semicolon - con->request.http_if_modified_since;
}
if (0 == strncmp(con->request.http_if_modified_since, mtime->ptr, used_len)) {
con->http_status = 304;
return HANDLER_FINISHED;
}
} else if (con->request.http_range) {
/* content prepared, I'm done */
con->file_finished = 1;
if (0 == http_response_parse_range(srv, con, p)) {
con->http_status = 206;
}
return HANDLER_FINISHED;
}
/* if we are still here, prepare body */
/* we add it here for all requests
* the HEAD request will drop it afterwards again
*/
http_chunk_append_file(srv, con, con->physical.path, 0, sce->st.st_size);
con->file_finished = 1;
return HANDLER_FINISHED;
}
/* this function is called at dlopen() time and inits the callbacks */
int mod_staticfile_plugin_init(plugin *p) {
p->version = LIGHTTPD_VERSION_ID;
p->name = buffer_init_string("staticfile");
p->init = mod_staticfile_init;
p->handle_subrequest_start = mod_staticfile_subrequest;
p->set_defaults = mod_staticfile_set_defaults;
p->cleanup = mod_staticfile_free;
p->data = NULL;
return 0;
}