diff options
Diffstat (limited to 'crypto/openssh/openbsd-compat/bsd-closefrom.c')
| -rw-r--r-- | crypto/openssh/openbsd-compat/bsd-closefrom.c | 100 |
1 files changed, 100 insertions, 0 deletions
diff --git a/crypto/openssh/openbsd-compat/bsd-closefrom.c b/crypto/openssh/openbsd-compat/bsd-closefrom.c new file mode 100644 index 0000000..61a9fa3 --- /dev/null +++ b/crypto/openssh/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 */ + |
