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[mod_dirlisting] use fdopendir(), fstatat() 

use fdopendir(), fstatat(), if available
This commit is contained in:
Glenn Strauss 2021-01-11 16:04:51 -05:00
parent 14f8f9b21c
commit ef28cce5e5
1 changed files with 50 additions and 15 deletions
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65
src/mod_dirlisting.c
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@ -1,3 +1,14 @@
/* fstatat() fdopendir() */
#if !defined(_XOPEN_SOURCE) || _XOPEN_SOURCE-0 < 700
#undef _XOPEN_SOURCE
#define _XOPEN_SOURCE 700
/* NetBSD dirent.h improperly hides fdopendir() (POSIX.1-2008) declaration
* which should be visible with _XOPEN_SOURCE 700 or _POSIX_C_SOURCE 200809L */
#ifdef __NetBSD__
#define _NETBSD_SOURCE
#endif
#endif
#include "first.h"
#include "sys-time.h"
@ -19,6 +30,20 @@
#include <fcntl.h>
#include <unistd.h>
#ifdef AT_FDCWD
#ifndef _ATFILE_SOURCE
#define _ATFILE_SOURCE
#endif
#endif
#ifndef _D_EXACT_NAMLEN
#ifdef _DIRENT_HAVE_D_NAMLEN
#define _D_EXACT_NAMLEN(d) ((d)->d_namlen)
#else
#define _D_EXACT_NAMLEN(d) (strlen ((d)->d_name))
#endif
#endif
#ifdef HAVE_PCRE_H
#include <pcre.h>
#endif
@ -829,12 +854,17 @@ static int http_list_directory(request_st * const r, plugin_data * const p, buff
char *path_file = path + dlen;
log_error_st * const errh = r->conf.errh;
DIR *dp;
struct dirent *dent;
if (NULL == (dp = opendir(path))) {
log_error(errh, __FILE__, __LINE__,
"opendir failed: %s", dir->ptr);
#ifndef _ATFILE_SOURCE /*(not using fdopendir unless _ATFILE_SOURCE)*/
const int dfd = -1;
DIR * const dp = opendir(path);
#else
const int dfd = fdevent_open_dirname(path, r->conf.follow_symlink);
DIR * const dp = (dfd >= 0) ? fdopendir(dfd) : NULL;
#endif
if (NULL == dp) {
log_perror(errh, __FILE__, __LINE__, "opendir %s", path);
if (dfd >= 0) close(dfd);
free(path);
return -1;
}
@ -853,6 +883,7 @@ static int http_list_directory(request_st * const r, plugin_data * const p, buff
struct stat st;
while ((dent = readdir(dp)) != NULL) {
const char * const d_name = dent->d_name;
const uint32_t dsz = (uint32_t) _D_EXACT_NAMLEN(dent);
if (d_name[0] == '.') {
if (hide_dotfiles)
continue;
@ -862,16 +893,14 @@ static int http_list_directory(request_st * const r, plugin_data * const p, buff
continue;
}
if (p->conf.hide_readme_file && !buffer_string_is_empty(p->conf.show_readme)) {
if (strcmp(d_name, p->conf.show_readme->ptr) == 0)
continue;
}
if (p->conf.hide_header_file && !buffer_string_is_empty(p->conf.show_header)) {
if (strcmp(d_name, p->conf.show_header->ptr) == 0)
continue;
}
const uint32_t dsz = (uint32_t)strlen(d_name);
if (p->conf.hide_readme_file
&& p->conf.show_readme
&& buffer_eq_slen(p->conf.show_readme, d_name, dsz))
continue;
if (p->conf.hide_header_file
&& p->conf.show_header
&& buffer_eq_slen(p->conf.show_header, d_name, dsz))
continue;
/* compare d_name against excludes array
* elements, skipping any that match.
@ -891,9 +920,15 @@ static int http_list_directory(request_st * const r, plugin_data * const p, buff
force_assert(dsz < sizeof(dent->d_name));
#endif
#ifndef _ATFILE_SOURCE
memcpy(path_file, d_name, dsz + 1);
if (stat(path, &st) != 0)
continue;
#else
/*(XXX: follow symlinks, like stat(); not using AT_SYMLINK_NOFOLLOW) */
if (0 != fstatat(dfd, d_name, &st, 0))
continue; /* file *just* disappeared? */
#endif
dirls_list_t * const list = !S_ISDIR(st.st_mode) ? &files : &dirs;
if (list->used == list->size) {