summaryrefslogtreecommitdiff
path: root/openbsd-compat/bsd-closefrom.c
diff options
context:
space:
mode:
authorDamien Miller <djm@mindrot.org>2004-08-15 18:40:59 +1000
committerDamien Miller <djm@mindrot.org>2004-08-15 18:40:59 +1000
commit36f496502072d82dbb202b41a199eb6032557710 (patch)
tree439092c6479cb2fea8c09318b37a61370d860638 /openbsd-compat/bsd-closefrom.c
parent25f60a7ee780c2cd4a01e05698149d274821012f (diff)
- (djm) [acconfig.h configure.ac openbsd-compat/Makefile.in
openbsd-compat/bsd-closefrom.c openbsd-compat/bsd-misc.c openbsd-compat/bsd-misc.h openbsd-compat/openbsd-compat.h] Use smarter closefrom() replacement from sudo; ok dtucker@
Diffstat (limited to 'openbsd-compat/bsd-closefrom.c')
-rw-r--r--openbsd-compat/bsd-closefrom.c100
1 files changed, 100 insertions, 0 deletions
diff --git a/openbsd-compat/bsd-closefrom.c b/openbsd-compat/bsd-closefrom.c
new file mode 100644
index 00000000..61a9fa39
--- /dev/null
+++ b/openbsd-compat/bsd-closefrom.c
@@ -0,0 +1,100 @@
+/*
+ * Copyright (c) 2004 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>
+#include <limits.h>
+#include <stdlib.h>
+#include <stddef.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
+
+RCSID("$Id: bsd-closefrom.c,v 1.1 2004/08/15 08:41:00 djm Exp $");
+
+#ifndef lint
+static const char sudorcsid[] = "$Sudo: closefrom.c,v 1.6 2004/06/01 20:51:56 millert Exp $";
+#endif /* lint */
+
+/*
+ * Close all file descriptors greater than or equal to lowfd.
+ */
+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 != -1 && 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_CLOSEFROM */
+