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Diffstat (limited to 'contrib/opie/libopie/lock.c')
-rw-r--r--contrib/opie/libopie/lock.c244
1 files changed, 0 insertions, 244 deletions
diff --git a/contrib/opie/libopie/lock.c b/contrib/opie/libopie/lock.c
deleted file mode 100644
index fc449d4cada40..0000000000000
--- a/contrib/opie/libopie/lock.c
+++ /dev/null
@@ -1,244 +0,0 @@
-/* lock.c: The opielock() library function.
-
-%%% portions-copyright-cmetz-96
-Portions of this software are Copyright 1996-1998 by Craig Metz, All Rights
-Reserved. The Inner Net License Version 2 applies to these portions of
-the software.
-You should have received a copy of the license with this software. If
-you didn't get a copy, you may request one from <license@inner.net>.
-
-Portions of this software are Copyright 1995 by Randall Atkinson and Dan
-McDonald, All Rights Reserved. All Rights under this copyright are assigned
-to the U.S. Naval Research Laboratory (NRL). The NRL Copyright Notice and
-License Agreement applies to this software.
-
- History:
-
- Modified by cmetz for OPIE 2.31. Put locks in a separate dir.
- Bug fixes.
- Modified by cmetz for OPIE 2.3. Do refcounts whether or not we
- actually lock. Fixed USER_LOCKING=0 case.
- Modified by cmetz for OPIE 2.22. Added reference count for locks.
- Changed lock filename/refcount symbol names to better indicate
- that they're not user serviceable.
- Modified by cmetz for OPIE 2.2. Use FUNCTION declaration et al.
- Use "principal" instead of "name" to make it clearer.
- Ifdef around some headers, be more careful about allowed
- error return values. Check open() return value properly.
- Avoid NULL.
- Created at NRL for OPIE 2.2 from opiesubr2.c
-*/
-#include "opie_cfg.h"
-#if HAVE_STRING_H
-#include <string.h>
-#endif /* HAVE_STRING_H */
-#if HAVE_UNISTD_H
-#include <unistd.h>
-#endif /* HAVE_UNISTD_H */
-#include <sys/stat.h>
-#include <syslog.h>
-#include <fcntl.h>
-#if HAVE_STDLIB_H
-#include <stdlib.h>
-#endif /* HAVE_STDLIB_H */
-#include <errno.h>
-#include "opie.h"
-
-#if !HAVE_LSTAT
-#define lstat(x, y) stat(x, y)
-#endif /* !HAVE_LSTAT */
-
-int __opie_lockrefcount = 0;
-
-#if USER_LOCKING
-char *__opie_lockfilename = (char *)0;
-
-/* atexit() handler for opielock() */
-static VOIDRET opieunlockaeh FUNCTION_NOARGS
-{
- if (__opie_lockfilename) {
- __opie_lockrefcount = 0;
- opieunlock();
- }
-}
-#endif /* USER_LOCKING */
-
-/*
- Serialize (we hope) authentication of user to prevent race conditions.
- Creates a lock file with a name of OPIE_LOCK_PREFIX with the user name
- appended. This file contains the pid of the lock's owner and a time()
- stamp. We use the former to check for dead owners and the latter to
- provide an upper bound on the lock duration. If there are any problems,
- we assume the lock is bogus.
-
- The value of this locking and its security implications are still not
- completely clear and require further study.
-
- One could conceivably hack this facility to provide locking of user
- accounts after several authentication failures.
-
- Return -1 on low-level error, 0 if ok, 1 on locking failure.
-*/
-int opielock FUNCTION((principal), char *principal)
-{
-#if USER_LOCKING
- int fh, waits = 0, rval = -1, pid, t, i;
- char buffer[128], buffer2[128], *c, *c2;
- struct stat statbuf[2];
-
- if (getuid() && geteuid()) {
-#if DEBUG
- syslog(LOG_DEBUG, "opielock: requires superuser priveleges");
-#endif /* DEBUG */
- return -1;
- };
-
- if (__opie_lockfilename) {
- __opie_lockrefcount++;
- return 0;
- }
-
- if (!(__opie_lockfilename = (char *)malloc(sizeof(OPIE_LOCK_DIR) + 1 + strlen(principal))))
- return -1;
-
- strcpy(__opie_lockfilename, OPIE_LOCK_DIR);
-
- if (mkdir(__opie_lockfilename, 0700) < 0)
- if (errno != EEXIST)
- return -1;
-
- if (lstat(__opie_lockfilename, &statbuf[0]) < 0)
- return -1;
-
- if (statbuf[0].st_uid) {
-#if DEBUG
- syslog(LOG_DEBUG, "opielock: %s isn't owned by the superuser.", __opie_lockfilename);
-#endif /* DEBUG */
- return -1;
- };
-
- if (!S_ISDIR(statbuf[0].st_mode)) {
-#if DEBUG
- syslog(LOG_DEBUG, "opielock: %s isn't a directory.", __opie_lockfilename);
-#endif /* DEBUG */
- return -1;
- };
-
- if ((statbuf[0].st_mode & 0777) != 00700) {
-#if DEBUG
- syslog(LOG_DEBUG, "opielock: permissions on %s are not correct.", __opie_lockfilename);
-#endif /* DEBUG */
- return -1;
- };
-
- strcat(__opie_lockfilename, "/");
- strcat(__opie_lockfilename, principal);
-
- fh = -1;
- while (fh < 0) {
- if (!lstat(__opie_lockfilename, &statbuf[0]))
- if (!S_ISREG(statbuf[0].st_mode))
- goto lockret;
-
- if ((fh = open(__opie_lockfilename, O_WRONLY | O_CREAT | O_EXCL, 0600)) < 0) {
- if (lstat(__opie_lockfilename, &statbuf[1]) < 0)
- goto lockret;
- if (statbuf[0].st_ino != statbuf[1].st_ino)
- goto lockret;
- if (statbuf[0].st_mode != statbuf[1].st_mode)
- goto lockret;
- if ((fh = open(__opie_lockfilename, O_RDONLY, 0600)) < 0)
- goto lockret;
- if ((i = read(fh, buffer, sizeof(buffer))) <= 0)
- goto lockret;
-
- buffer[sizeof(buffer) - 1] = 0;
- buffer[i - 1] = 0;
-
- if (!(c = strchr(buffer, '\n')))
- break;
-
- *(c++) = 0;
-
- if (!(c2 = strchr(c, '\n')))
- break;
-
- *(c2++) = 0;
-
- if (!(pid = atoi(buffer)))
- break;
-
- if (!(t = atoi(c)))
- break;
-
- if ((t + OPIE_LOCK_TIMEOUT) < time(0))
- break;
-
- if (kill(pid, 0))
- break;
-
- close(fh);
- fh = 0;
- sleep(1);
- if (waits++ > 3) {
- rval = 1;
- goto lockret;
- };
- };
- };
-
- if (lstat(__opie_lockfilename, &statbuf[0]) < 0)
- goto lockret;
- if (fstat(fh, &statbuf[1]) < 0)
- goto lockret;
- if (!S_ISREG(statbuf[0].st_mode) || (statbuf[0].st_mode != statbuf[1].st_mode) || (statbuf[0].st_ino != statbuf[1].st_ino))
- goto lockret;
-
- sprintf(buffer, "%d\n%d\n", getpid(), time(0));
- i = strlen(buffer) + 1;
- if (lseek(fh, 0, SEEK_SET)) {
- close(fh);
- unlink(__opie_lockfilename);
- fh = 0;
- goto lockret;
- };
- if (write(fh, buffer, i) != i) {
- close(fh);
- unlink(__opie_lockfilename);
- fh = 0;
- goto lockret;
- };
- close(fh);
- if ((fh = open(__opie_lockfilename, O_RDWR, 0600)) < 0) {
- unlink(__opie_lockfilename);
- goto lockret;
- };
- if (read(fh, buffer2, i) != i) {
- close(fh);
- unlink(__opie_lockfilename);
- fh = 0;
- goto lockret;
- };
- close(fh);
- if (memcmp(buffer, buffer2, i)) {
- unlink(__opie_lockfilename);
- goto lockret;
- };
-
- __opie_lockrefcount++;
- rval = 0;
- atexit(opieunlockaeh);
-
-lockret:
- if (fh >= 0)
- close(fh);
- if (!__opie_lockrefcount) {
- free (__opie_lockfilename);
- __opie_lockfilename = NULL;
- };
- return rval;
-#else /* USER_LOCKING */
- __opie_lockrefcount++;
- return 0;
-#endif /* USER_LOCKING */
-}
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