blob: 9380b33a7247f14e975a5ea2daee8f357094f5a4 [file] [log] [blame]
Damien Miller36f49652004-08-15 18:40:59 +10001/*
Darren Tuckerd018b2e2006-08-18 18:51:20 +10002 * Copyright (c) 2004-2005 Todd C. Miller <Todd.Miller@courtesan.com>
Damien Miller36f49652004-08-15 18:40:59 +10003 *
4 * Permission to use, copy, modify, and distribute this software for any
5 * purpose with or without fee is hereby granted, provided that the above
6 * copyright notice and this permission notice appear in all copies.
7 *
8 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
9 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
10 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
11 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
12 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
13 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
14 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
15 */
16
17#include "includes.h"
18
19#ifndef HAVE_CLOSEFROM
20
21#include <sys/types.h>
22#include <sys/param.h>
23#include <unistd.h>
24#include <stdio.h>
Darren Tucker3083bc22006-08-17 19:35:49 +100025#ifdef HAVE_FCNTL_H
26# include <fcntl.h>
27#endif
Damien Miller36f49652004-08-15 18:40:59 +100028#include <limits.h>
29#include <stdlib.h>
30#include <stddef.h>
Damien Miller62da44f2006-07-24 15:08:35 +100031#include <string.h>
32#include <unistd.h>
Damien Miller36f49652004-08-15 18:40:59 +100033#ifdef HAVE_DIRENT_H
34# include <dirent.h>
35# define NAMLEN(dirent) strlen((dirent)->d_name)
36#else
37# define dirent direct
38# define NAMLEN(dirent) (dirent)->d_namlen
39# ifdef HAVE_SYS_NDIR_H
40# include <sys/ndir.h>
41# endif
42# ifdef HAVE_SYS_DIR_H
43# include <sys/dir.h>
44# endif
45# ifdef HAVE_NDIR_H
46# include <ndir.h>
47# endif
48#endif
49
50#ifndef OPEN_MAX
51# define OPEN_MAX 256
52#endif
53
Darren Tucker43d3ccd2006-08-18 19:49:58 +100054#if 0
Darren Tuckerd018b2e2006-08-18 18:51:20 +100055__unused static const char rcsid[] = "$Sudo: closefrom.c,v 1.11 2006/08/17 15:26:54 millert Exp $";
Damien Miller36f49652004-08-15 18:40:59 +100056#endif /* lint */
57
58/*
59 * Close all file descriptors greater than or equal to lowfd.
60 */
Darren Tuckerd018b2e2006-08-18 18:51:20 +100061#ifdef HAVE_FCNTL_CLOSEM
62void
63closefrom(int lowfd)
64{
65 (void) fcntl(lowfd, F_CLOSEM, 0);
66}
67#else
Damien Miller36f49652004-08-15 18:40:59 +100068void
69closefrom(int lowfd)
70{
71 long fd, maxfd;
72#if defined(HAVE_DIRFD) && defined(HAVE_PROC_PID)
73 char fdpath[PATH_MAX], *endp;
74 struct dirent *dent;
75 DIR *dirp;
76 int len;
77
78 /* Check for a /proc/$$/fd directory. */
79 len = snprintf(fdpath, sizeof(fdpath), "/proc/%ld/fd", (long)getpid());
Darren Tuckerd018b2e2006-08-18 18:51:20 +100080 if (len > 0 && (size_t)len <= sizeof(fdpath) && (dirp = opendir(fdpath))) {
Damien Miller36f49652004-08-15 18:40:59 +100081 while ((dent = readdir(dirp)) != NULL) {
82 fd = strtol(dent->d_name, &endp, 10);
83 if (dent->d_name != endp && *endp == '\0' &&
84 fd >= 0 && fd < INT_MAX && fd >= lowfd && fd != dirfd(dirp))
85 (void) close((int) fd);
86 }
87 (void) closedir(dirp);
88 } else
Damien Miller36f49652004-08-15 18:40:59 +100089#endif
90 {
91 /*
92 * Fall back on sysconf() or getdtablesize(). We avoid checking
93 * resource limits since it is possible to open a file descriptor
94 * and then drop the rlimit such that it is below the open fd.
95 */
96#ifdef HAVE_SYSCONF
97 maxfd = sysconf(_SC_OPEN_MAX);
98#else
99 maxfd = getdtablesize();
100#endif /* HAVE_SYSCONF */
101 if (maxfd < 0)
102 maxfd = OPEN_MAX;
103
104 for (fd = lowfd; fd < maxfd; fd++)
105 (void) close((int) fd);
106 }
107}
Darren Tuckerd018b2e2006-08-18 18:51:20 +1000108#endif /* !HAVE_FCNTL_CLOSEM */
Damien Miller36f49652004-08-15 18:40:59 +1000109#endif /* HAVE_CLOSEFROM */