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Commit | Line | Data |
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419e26e7 | 1 | /* |
795e7517 | 2 | * Copyright (c) 2004-2005 Todd C. Miller <Todd.Miller@courtesan.com> |
419e26e7 | 3 | * |
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> | |
53c337ed | 25 | #ifdef HAVE_FCNTL_H |
26 | # include <fcntl.h> | |
27 | #endif | |
419e26e7 | 28 | #include <limits.h> |
29 | #include <stdlib.h> | |
30 | #include <stddef.h> | |
e204f3ee | 31 | #include <string.h> |
32 | #include <unistd.h> | |
419e26e7 | 33 | #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 | ||
5a1d6300 | 54 | #if 0 |
795e7517 | 55 | __unused static const char rcsid[] = "$Sudo: closefrom.c,v 1.11 2006/08/17 15:26:54 millert Exp $"; |
419e26e7 | 56 | #endif /* lint */ |
57 | ||
58 | /* | |
59 | * Close all file descriptors greater than or equal to lowfd. | |
60 | */ | |
795e7517 | 61 | #ifdef HAVE_FCNTL_CLOSEM |
62 | void | |
63 | closefrom(int lowfd) | |
64 | { | |
65 | (void) fcntl(lowfd, F_CLOSEM, 0); | |
66 | } | |
67 | #else | |
419e26e7 | 68 | void |
69 | closefrom(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()); | |
795e7517 | 80 | if (len > 0 && (size_t)len <= sizeof(fdpath) && (dirp = opendir(fdpath))) { |
419e26e7 | 81 | 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 | |
89 | #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 | } | |
795e7517 | 108 | #endif /* !HAVE_FCNTL_CLOSEM */ |
419e26e7 | 109 | #endif /* HAVE_CLOSEFROM */ |