| /* |
| * Copyright (c) 2004-2005 Todd C. Miller <Todd.Miller@courtesan.com> |
| * |
| * Permission to use, copy, modify, and distribute this software for any |
| * purpose with or without fee is hereby granted, provided that the above |
| * copyright notice and this permission notice appear in all copies. |
| * |
| * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES |
| * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF |
| * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR |
| * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES |
| * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN |
| * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF |
| * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. |
| */ |
| |
| #include "includes.h" |
| |
| #ifndef HAVE_CLOSEFROM |
| |
| #include <sys/types.h> |
| #include <sys/param.h> |
| #include <unistd.h> |
| #include <stdio.h> |
| #ifdef HAVE_FCNTL_H |
| # include <fcntl.h> |
| #endif |
| #include <limits.h> |
| #include <stdlib.h> |
| #include <stddef.h> |
| #include <string.h> |
| #include <unistd.h> |
| #ifdef HAVE_DIRENT_H |
| # include <dirent.h> |
| # define NAMLEN(dirent) strlen((dirent)->d_name) |
| #else |
| # define dirent direct |
| # define NAMLEN(dirent) (dirent)->d_namlen |
| # ifdef HAVE_SYS_NDIR_H |
| # include <sys/ndir.h> |
| # endif |
| # ifdef HAVE_SYS_DIR_H |
| # include <sys/dir.h> |
| # endif |
| # ifdef HAVE_NDIR_H |
| # include <ndir.h> |
| # endif |
| #endif |
| |
| #ifndef OPEN_MAX |
| # define OPEN_MAX 256 |
| #endif |
| |
| #ifndef lint |
| __unused static const char rcsid[] = "$Sudo: closefrom.c,v 1.11 2006/08/17 15:26:54 millert Exp $"; |
| #endif /* lint */ |
| |
| /* |
| * Close all file descriptors greater than or equal to lowfd. |
| */ |
| #ifdef HAVE_FCNTL_CLOSEM |
| void |
| closefrom(int lowfd) |
| { |
| (void) fcntl(lowfd, F_CLOSEM, 0); |
| } |
| #else |
| void |
| closefrom(int lowfd) |
| { |
| long fd, maxfd; |
| #if defined(HAVE_DIRFD) && defined(HAVE_PROC_PID) |
| char fdpath[PATH_MAX], *endp; |
| struct dirent *dent; |
| DIR *dirp; |
| int len; |
| |
| /* Check for a /proc/$$/fd directory. */ |
| len = snprintf(fdpath, sizeof(fdpath), "/proc/%ld/fd", (long)getpid()); |
| if (len > 0 && (size_t)len <= sizeof(fdpath) && (dirp = opendir(fdpath))) { |
| while ((dent = readdir(dirp)) != NULL) { |
| fd = strtol(dent->d_name, &endp, 10); |
| if (dent->d_name != endp && *endp == '\0' && |
| fd >= 0 && fd < INT_MAX && fd >= lowfd && fd != dirfd(dirp)) |
| (void) close((int) fd); |
| } |
| (void) closedir(dirp); |
| } else |
| #endif |
| { |
| /* |
| * Fall back on sysconf() or getdtablesize(). We avoid checking |
| * resource limits since it is possible to open a file descriptor |
| * and then drop the rlimit such that it is below the open fd. |
| */ |
| #ifdef HAVE_SYSCONF |
| maxfd = sysconf(_SC_OPEN_MAX); |
| #else |
| maxfd = getdtablesize(); |
| #endif /* HAVE_SYSCONF */ |
| if (maxfd < 0) |
| maxfd = OPEN_MAX; |
| |
| for (fd = lowfd; fd < maxfd; fd++) |
| (void) close((int) fd); |
| } |
| } |
| #endif /* !HAVE_FCNTL_CLOSEM */ |
| #endif /* HAVE_CLOSEFROM */ |