Damien Miller | 36f4965 | 2004-08-15 18:40:59 +1000 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (c) 2004 Todd C. Miller <Todd.Miller@courtesan.com> |
| 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> |
| 25 | #include <limits.h> |
| 26 | #include <stdlib.h> |
| 27 | #include <stddef.h> |
| 28 | #ifdef HAVE_DIRENT_H |
| 29 | # include <dirent.h> |
| 30 | # define NAMLEN(dirent) strlen((dirent)->d_name) |
| 31 | #else |
| 32 | # define dirent direct |
| 33 | # define NAMLEN(dirent) (dirent)->d_namlen |
| 34 | # ifdef HAVE_SYS_NDIR_H |
| 35 | # include <sys/ndir.h> |
| 36 | # endif |
| 37 | # ifdef HAVE_SYS_DIR_H |
| 38 | # include <sys/dir.h> |
| 39 | # endif |
| 40 | # ifdef HAVE_NDIR_H |
| 41 | # include <ndir.h> |
| 42 | # endif |
| 43 | #endif |
| 44 | |
| 45 | #ifndef OPEN_MAX |
| 46 | # define OPEN_MAX 256 |
| 47 | #endif |
| 48 | |
Darren Tucker | 30d6974 | 2005-11-10 19:29:12 +1100 | [diff] [blame] | 49 | RCSID("$Id: bsd-closefrom.c,v 1.2 2005/11/10 08:29:13 dtucker Exp $"); |
Damien Miller | 36f4965 | 2004-08-15 18:40:59 +1000 | [diff] [blame] | 50 | |
| 51 | #ifndef lint |
| 52 | static const char sudorcsid[] = "$Sudo: closefrom.c,v 1.6 2004/06/01 20:51:56 millert Exp $"; |
| 53 | #endif /* lint */ |
| 54 | |
| 55 | /* |
| 56 | * Close all file descriptors greater than or equal to lowfd. |
| 57 | */ |
| 58 | void |
| 59 | closefrom(int lowfd) |
| 60 | { |
| 61 | long fd, maxfd; |
| 62 | #if defined(HAVE_DIRFD) && defined(HAVE_PROC_PID) |
| 63 | char fdpath[PATH_MAX], *endp; |
| 64 | struct dirent *dent; |
| 65 | DIR *dirp; |
| 66 | int len; |
| 67 | |
| 68 | /* Check for a /proc/$$/fd directory. */ |
| 69 | len = snprintf(fdpath, sizeof(fdpath), "/proc/%ld/fd", (long)getpid()); |
Darren Tucker | 30d6974 | 2005-11-10 19:29:12 +1100 | [diff] [blame] | 70 | if (len >= 0 && (u_int)len <= sizeof(fdpath) && (dirp = opendir(fdpath))) { |
Damien Miller | 36f4965 | 2004-08-15 18:40:59 +1000 | [diff] [blame] | 71 | while ((dent = readdir(dirp)) != NULL) { |
| 72 | fd = strtol(dent->d_name, &endp, 10); |
| 73 | if (dent->d_name != endp && *endp == '\0' && |
| 74 | fd >= 0 && fd < INT_MAX && fd >= lowfd && fd != dirfd(dirp)) |
| 75 | (void) close((int) fd); |
| 76 | } |
| 77 | (void) closedir(dirp); |
| 78 | } else |
| 79 | #endif |
| 80 | { |
| 81 | /* |
| 82 | * Fall back on sysconf() or getdtablesize(). We avoid checking |
| 83 | * resource limits since it is possible to open a file descriptor |
| 84 | * and then drop the rlimit such that it is below the open fd. |
| 85 | */ |
| 86 | #ifdef HAVE_SYSCONF |
| 87 | maxfd = sysconf(_SC_OPEN_MAX); |
| 88 | #else |
| 89 | maxfd = getdtablesize(); |
| 90 | #endif /* HAVE_SYSCONF */ |
| 91 | if (maxfd < 0) |
| 92 | maxfd = OPEN_MAX; |
| 93 | |
| 94 | for (fd = lowfd; fd < maxfd; fd++) |
| 95 | (void) close((int) fd); |
| 96 | } |
| 97 | } |
| 98 | |
| 99 | #endif /* HAVE_CLOSEFROM */ |
| 100 | |