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[stat_cache] no longer stat() and open() for stat 

do not open file in stat_cache_get_entry()
no longer stat() followed by open() and close() just for stat()

callers should open() file to validate readability (and then reuse fd)
This commit is contained in:
Glenn Strauss 2019-04-29 20:23:00 -04:00
parent 44156bbe81
commit f56800e86a
2 changed files with 5 additions and 28 deletions
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14
src/mod_cgi.c
View File

@ -719,13 +719,12 @@ static int cgi_write_request(server *srv, handler_ctx *hctx, int fd) {
return 0;
}
static struct stat * cgi_stat(server *srv, connection *con, buffer *path, struct stat *st) {
/* CGI might be executable even if it is not readable
* (stat_cache_get_entry() currently checks file is readable)*/
static struct stat * cgi_stat(server *srv, connection *con, buffer *path) {
/* CGI might be executable even if it is not readable */
stat_cache_entry *sce;
return (HANDLER_ERROR != stat_cache_get_entry(srv, con, path, &sce))
? &sce->st
: (0 == stat(path->ptr, st)) ? st : NULL;
: NULL;
}
static int cgi_create_env(server *srv, connection *con, plugin_data *p, handler_ctx *hctx, buffer *cgi_handler) {
@ -736,9 +735,7 @@ static int cgi_create_env(server *srv, connection *con, plugin_data *p, handler_
UNUSED(p);
if (!buffer_string_is_empty(cgi_handler)) {
/* stat the exec file */
struct stat st;
if (NULL == cgi_stat(srv, con, cgi_handler, &st)) {
if (NULL == cgi_stat(srv, con, cgi_handler)) {
log_error_write(srv, __FILE__, __LINE__, "sbss",
"stat for cgi-handler", cgi_handler,
"failed:", strerror(errno));
@ -910,7 +907,6 @@ static int mod_cgi_patch_connection(server *srv, connection *con, plugin_data *p
URIHANDLER_FUNC(cgi_is_handled) {
plugin_data *p = p_d;
struct stat stbuf;
struct stat *st;
data_string *ds;
@ -922,7 +918,7 @@ URIHANDLER_FUNC(cgi_is_handled) {
ds = (data_string *)array_match_key_suffix(p->conf.cgi, con->physical.path);
if (NULL == ds) return HANDLER_GO_ON;
st = cgi_stat(srv, con, con->physical.path, &stbuf);
st = cgi_stat(srv, con, con->physical.path);
if (NULL == st) return HANDLER_GO_ON;
if (!S_ISREG(st->st_mode)) return HANDLER_GO_ON;

19
src/stat_cache.c
View File

@ -717,7 +717,6 @@ handler_t stat_cache_get_entry(server *srv, connection *con, buffer *name, stat_
stat_cache_entry *sce = NULL;
stat_cache *sc;
struct stat st;
int fd;
int file_ndx;
UNUSED(con);
@ -788,34 +787,16 @@ handler_t stat_cache_get_entry(server *srv, connection *con, buffer *name, stat_
}
#endif
/*
* *lol*
* - open() + fstat() on a named-pipe results in a (intended) hang.
* - stat() if regular file + open() to see if we can read from it is better
*
* */
if (-1 == stat(name->ptr, &st)) {
return HANDLER_ERROR;
}
if (S_ISREG(st.st_mode)) {
/* fix broken stat/open for symlinks to reg files with appended slash on freebsd,osx */
if (name->ptr[buffer_string_length(name) - 1] == '/') {
errno = ENOTDIR;
return HANDLER_ERROR;
}
/* try to open the file to check if we can read it */
#ifdef O_NONBLOCK
fd = open(name->ptr, O_RDONLY | O_NONBLOCK, 0);
#else
fd = open(name->ptr, O_RDONLY, 0);
#endif
if (-1 == fd) {
return HANDLER_ERROR;
}
close(fd);
}
if (NULL == sce) {