2 * Copyright (c) 2011, David E. O'Brien.
3 * Copyright (c) 2009-2011, Juniper Networks, Inc.
4 * Copyright (c) 2015, EMC Corp.
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
16 * THIS SOFTWARE IS PROVIDED BY JUNIPER NETWORKS AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL JUNIPER NETWORKS OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 #include <sys/cdefs.h>
30 __FBSDID("$FreeBSD$");
32 #include "opt_compat.h"
34 #include <sys/param.h>
36 #include <sys/systm.h>
38 #include <sys/condvar.h>
40 #include <sys/fcntl.h>
41 #include <sys/ioccom.h>
42 #include <sys/kernel.h>
44 #include <sys/malloc.h>
45 #include <sys/module.h>
46 #include <sys/mutex.h>
49 #include <sys/queue.h>
51 #include <sys/syscall.h>
52 #include <sys/sysent.h>
53 #include <sys/sysproto.h>
56 #if __FreeBSD_version >= 900041
57 #include <sys/capsicum.h>
62 #if defined(COMPAT_IA32) || defined(COMPAT_FREEBSD32) || defined(COMPAT_ARCH32)
63 #include <compat/freebsd32/freebsd32_syscall.h>
64 #include <compat/freebsd32/freebsd32_proto.h>
66 extern struct sysentvec ia32_freebsd_sysvec;
69 extern struct sysentvec elf32_freebsd_sysvec;
70 extern struct sysentvec elf64_freebsd_sysvec;
72 static d_close_t filemon_close;
73 static d_ioctl_t filemon_ioctl;
74 static d_open_t filemon_open;
75 static int filemon_unload(void);
76 static void filemon_load(void *);
78 static struct cdevsw filemon_cdevsw = {
79 .d_version = D_VERSION,
80 .d_close = filemon_close,
81 .d_ioctl = filemon_ioctl,
82 .d_open = filemon_open,
86 MALLOC_DECLARE(M_FILEMON);
87 MALLOC_DEFINE(M_FILEMON, "filemon", "File access monitor");
90 TAILQ_ENTRY(filemon) link; /* Link into the in-use list. */
91 struct sx lock; /* Lock mutex for this filemon. */
92 struct file *fp; /* Output file pointer. */
93 pid_t pid; /* The process ID being monitored. */
94 char fname1[MAXPATHLEN]; /* Temporary filename buffer. */
95 char fname2[MAXPATHLEN]; /* Temporary filename buffer. */
96 char msgbufr[1024]; /* Output message buffer. */
99 static TAILQ_HEAD(, filemon) filemons_inuse = TAILQ_HEAD_INITIALIZER(filemons_inuse);
100 static TAILQ_HEAD(, filemon) filemons_free = TAILQ_HEAD_INITIALIZER(filemons_free);
101 static struct sx access_lock;
103 static struct cdev *filemon_dev;
105 #include "filemon_lock.c"
106 #include "filemon_wrapper.c"
109 filemon_dtr(void *data)
111 struct filemon *filemon = data;
113 if (filemon != NULL) {
114 struct file *fp = filemon->fp;
116 /* Get exclusive write access. */
117 filemon_lock_write();
119 /* Remove from the in-use list. */
120 TAILQ_REMOVE(&filemons_inuse, filemon, link);
125 /* Add to the free list. */
126 TAILQ_INSERT_TAIL(&filemons_free, filemon, link);
128 /* Give up write access. */
129 filemon_unlock_write();
132 fdrop(fp, curthread);
137 filemon_ioctl(struct cdev *dev, u_long cmd, caddr_t data, int flag __unused,
141 struct filemon *filemon;
143 #if __FreeBSD_version >= 900041
147 devfs_get_cdevpriv((void **) &filemon);
150 /* Set the output file descriptor. */
152 error = fget_write(td, *(int *)data,
153 #if __FreeBSD_version >= 900041
154 cap_rights_init(&rights, CAP_PWRITE),
158 /* Write the file header. */
159 filemon_comment(filemon);
162 /* Set the monitored process ID. */
163 case FILEMON_SET_PID:
164 error = pget(*((pid_t *)data), PGET_CANDEBUG | PGET_NOTWEXIT,
167 filemon->pid = p->p_pid;
181 filemon_open(struct cdev *dev, int oflags __unused, int devtype __unused,
182 struct thread *td __unused)
184 struct filemon *filemon;
186 /* Get exclusive write access. */
187 filemon_lock_write();
189 if ((filemon = TAILQ_FIRST(&filemons_free)) != NULL)
190 TAILQ_REMOVE(&filemons_free, filemon, link);
192 /* Give up write access. */
193 filemon_unlock_write();
195 if (filemon == NULL) {
196 filemon = malloc(sizeof(struct filemon), M_FILEMON,
201 sx_init(&filemon->lock, "filemon");
204 filemon->pid = curproc->p_pid;
206 devfs_set_cdevpriv(filemon, filemon_dtr);
208 /* Get exclusive write access. */
209 filemon_lock_write();
211 /* Add to the in-use list. */
212 TAILQ_INSERT_TAIL(&filemons_inuse, filemon, link);
214 /* Give up write access. */
215 filemon_unlock_write();
221 filemon_close(struct cdev *dev __unused, int flag __unused, int fmt __unused,
222 struct thread *td __unused)
229 filemon_load(void *dummy __unused)
231 sx_init(&access_lock, "filemons_inuse");
233 /* Install the syscall wrappers. */
234 filemon_wrapper_install();
236 filemon_dev = make_dev(&filemon_cdevsw, 0, UID_ROOT, GID_WHEEL, 0666,
243 struct filemon *filemon;
246 /* Get exclusive write access. */
247 filemon_lock_write();
249 if (TAILQ_FIRST(&filemons_inuse) != NULL)
252 destroy_dev(filemon_dev);
254 /* Deinstall the syscall wrappers. */
255 filemon_wrapper_deinstall();
258 /* Give up write access. */
259 filemon_unlock_write();
262 /* free() filemon structs free list. */
263 filemon_lock_write();
264 while ((filemon = TAILQ_FIRST(&filemons_free)) != NULL) {
265 TAILQ_REMOVE(&filemons_free, filemon, link);
266 sx_destroy(&filemon->lock);
267 free(filemon, M_FILEMON);
269 filemon_unlock_write();
271 sx_destroy(&access_lock);
278 filemon_modevent(module_t mod __unused, int type, void *data)
288 error = filemon_unload();
303 DEV_MODULE(filemon, filemon_modevent, NULL);
304 MODULE_VERSION(filemon, 1);