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392 lines
9.7 KiB
C
392 lines
9.7 KiB
C
/* $NetBSD: filemon_wrapper.c,v 1.7 2015/06/15 19:45:31 christos Exp $ */
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/*
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* Copyright (c) 2010, Juniper Networks, Inc.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: filemon_wrapper.c,v 1.7 2015/06/15 19:45:31 christos Exp $");
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#include <sys/param.h>
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#include <sys/types.h>
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#include <sys/fcntl.h>
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#include <sys/kernel.h>
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#include <sys/lwp.h>
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#include <sys/proc.h>
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#include <sys/syscall.h>
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#include <sys/syscallargs.h>
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#include "filemon.h"
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static int
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filemon_wrapper_chdir(struct lwp * l, const struct sys_chdir_args * uap,
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register_t * retval)
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{
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int error;
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size_t done;
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struct filemon *filemon;
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if ((error = sys_chdir(l, uap, retval)) != 0)
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return 0;
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filemon = filemon_lookup(curproc);
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if (filemon == NULL)
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return 0;
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error = copyinstr(SCARG(uap, path), filemon->fm_fname1,
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sizeof(filemon->fm_fname1), &done);
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if (error)
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goto out;
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filemon_printf(filemon, "C %d %s\n",
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curproc->p_pid, filemon->fm_fname1);
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out:
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rw_exit(&filemon->fm_mtx);
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return 0;
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}
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static int
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filemon_wrapper_execve(struct lwp * l, struct sys_execve_args * uap,
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register_t * retval)
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{
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char fname[MAXPATHLEN];
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int error;
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size_t done;
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struct filemon *filemon;
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if ((error = sys_execve(l, uap, retval)) != EJUSTRETURN)
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return 0;
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filemon = filemon_lookup(curproc);
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if (filemon == NULL)
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return 0;
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error = copyinstr(SCARG(uap, path), fname, sizeof(fname), &done);
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if (error)
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goto out;
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filemon_printf(filemon, "E %d %s\n", curproc->p_pid, fname);
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out:
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rw_exit(&filemon->fm_mtx);
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return 0;
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}
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static int
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filemon_wrapper_fork(struct lwp * l, const void *v, register_t * retval)
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{
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int error;
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struct filemon *filemon;
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if ((error = sys_fork(l, v, retval)) != 0)
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return error;
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filemon = filemon_lookup(curproc);
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if (filemon == NULL)
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return 0;
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filemon_printf(filemon, "F %d %ld\n", curproc->p_pid, (long) retval[0]);
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rw_exit(&filemon->fm_mtx);
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return 0;
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}
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static int
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filemon_wrapper_vfork(struct lwp * l, const void *v, register_t * retval)
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{
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int error;
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struct filemon *filemon;
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if ((error = sys_vfork(l, v, retval)) != 0)
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return error;
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filemon = filemon_lookup(curproc);
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if (filemon == NULL)
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return 0;
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filemon_printf(filemon, "F %d %ld\n", curproc->p_pid, (long) retval[0]);
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rw_exit(&filemon->fm_mtx);
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return 0;
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}
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static void
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filemon_flags(struct filemon * filemon, int f)
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{
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if (f & O_RDWR) {
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/* we want a separate R record */
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filemon_printf(filemon, "R %d %s\n", curproc->p_pid,
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filemon->fm_fname1);
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}
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filemon_printf(filemon, "%c %d %s\n", (f & O_ACCMODE) ? 'W' : 'R',
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curproc->p_pid, filemon->fm_fname1);
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}
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static int
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filemon_wrapper_open(struct lwp * l, struct sys_open_args * uap,
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register_t * retval)
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{
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int error;
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size_t done;
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struct filemon *filemon;
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if ((error = sys_open(l, uap, retval)) != 0)
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return error;
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filemon = filemon_lookup(curproc);
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if (filemon == NULL)
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return 0;
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error = copyinstr(SCARG(uap, path), filemon->fm_fname1,
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sizeof(filemon->fm_fname1), &done);
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if (error)
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goto out;
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filemon_flags(filemon, SCARG(uap, flags));
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out:
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rw_exit(&filemon->fm_mtx);
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return 0;
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}
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static int
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filemon_wrapper_openat(struct lwp * l, struct sys_openat_args * uap,
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register_t * retval)
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{
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int error;
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size_t done;
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struct filemon *filemon;
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if ((error = sys_openat(l, uap, retval)) != 0)
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return error;
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filemon = filemon_lookup(curproc);
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if (filemon == NULL)
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return 0;
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error = copyinstr(SCARG(uap, path), filemon->fm_fname1,
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sizeof(filemon->fm_fname1), &done);
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if (error)
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goto out;
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if (filemon->fm_fname1[0] != '/' && SCARG(uap, fd) != AT_FDCWD) {
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/*
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* Rats we cannot just treat like open.
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* Output an 'A' record as a clue.
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*/
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filemon_printf(filemon, "A %d %s\n", curproc->p_pid,
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filemon->fm_fname1);
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}
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filemon_flags(filemon, SCARG(uap, oflags));
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out:
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rw_exit(&filemon->fm_mtx);
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return 0;
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}
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static int
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filemon_wrapper_rename(struct lwp * l, struct sys_rename_args * uap,
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register_t * retval)
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{
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int error;
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size_t done;
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struct filemon *filemon;
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if ((error = sys_rename(l, uap, retval)) != 0)
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return error;
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filemon = filemon_lookup(curproc);
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if (filemon == NULL)
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return 0;
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error = copyinstr(SCARG(uap, from), filemon->fm_fname1,
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sizeof(filemon->fm_fname1), &done);
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if (error)
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goto out;
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error = copyinstr(SCARG(uap, to), filemon->fm_fname2,
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sizeof(filemon->fm_fname2), &done);
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if (error)
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goto out;
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filemon_printf(filemon, "M %d '%s' '%s'\n", curproc->p_pid,
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filemon->fm_fname1, filemon->fm_fname2);
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out:
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rw_exit(&filemon->fm_mtx);
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return 0;
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}
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static int
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filemon_wrapper_link(struct lwp * l, struct sys_link_args * uap,
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register_t * retval)
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{
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int error;
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size_t done;
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struct filemon *filemon;
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if ((error = sys_link(l, uap, retval)) != 0)
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return error;
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filemon = filemon_lookup(curproc);
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if (filemon == NULL)
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return 0;
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error = copyinstr(SCARG(uap, path), filemon->fm_fname1,
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sizeof(filemon->fm_fname1), &done);
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if (error)
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goto out;
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error = copyinstr(SCARG(uap, link), filemon->fm_fname2,
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sizeof(filemon->fm_fname2), &done);
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if (error)
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goto out;
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filemon_printf(filemon, "L %d '%s' '%s'\n", curproc->p_pid,
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filemon->fm_fname1, filemon->fm_fname2);
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out:
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rw_exit(&filemon->fm_mtx);
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return 0;
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}
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static int
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filemon_wrapper_symlink(struct lwp * l, struct sys_symlink_args * uap,
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register_t * retval)
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{
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int error;
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size_t done;
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struct filemon *filemon;
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if ((error = sys_symlink(l, uap, retval)) != 0)
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return error;
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filemon = filemon_lookup(curproc);
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if (filemon == NULL)
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return 0;
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error = copyinstr(SCARG(uap, path), filemon->fm_fname1,
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sizeof(filemon->fm_fname1), &done);
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if (error)
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goto out;
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error = copyinstr(SCARG(uap, link), filemon->fm_fname2,
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sizeof(filemon->fm_fname2), &done);
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if (error)
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goto out;
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filemon_printf(filemon, "L %d '%s' '%s'\n", curproc->p_pid,
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filemon->fm_fname1, filemon->fm_fname2);
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out:
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rw_exit(&filemon->fm_mtx);
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return 0;
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}
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static void
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filemon_wrapper_sys_exit(struct lwp * l, struct sys_exit_args * uap,
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register_t * retval)
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{
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struct filemon *filemon;
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filemon = filemon_lookup(curproc);
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if (filemon) {
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filemon_printf(filemon, "X %d %d\n",
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curproc->p_pid, SCARG(uap, rval));
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/* Check if the monitored process is about to exit. */
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if (filemon->fm_pid == curproc->p_pid)
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filemon_printf(filemon, "# Bye bye\n");
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rw_exit(&filemon->fm_mtx);
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}
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sys_exit(l, uap, retval);
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}
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static int
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filemon_wrapper_unlink(struct lwp * l, struct sys_unlink_args * uap,
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register_t * retval)
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{
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int error;
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size_t done;
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struct filemon *filemon;
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if ((error = sys_unlink(l, uap, retval)) != 0)
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return error;
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filemon = filemon_lookup(curproc);
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if (filemon == NULL)
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return 0;
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error = copyinstr(SCARG(uap, path), filemon->fm_fname1,
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sizeof(filemon->fm_fname1), &done);
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if (error)
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goto out;
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filemon_printf(filemon, "D %d %s\n",
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curproc->p_pid, filemon->fm_fname1);
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out:
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rw_exit(&filemon->fm_mtx);
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return 0;
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}
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void
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filemon_wrapper_install(void)
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{
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struct sysent *sv_table = curproc->p_emul->e_sysent;
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sv_table[SYS_chdir].sy_call = (sy_call_t *) filemon_wrapper_chdir;
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sv_table[SYS_execve].sy_call = (sy_call_t *) filemon_wrapper_execve;
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sv_table[SYS_exit].sy_call = (sy_call_t *) filemon_wrapper_sys_exit;
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sv_table[SYS_fork].sy_call = (sy_call_t *) filemon_wrapper_fork;
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sv_table[SYS_link].sy_call = (sy_call_t *) filemon_wrapper_link;
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sv_table[SYS_open].sy_call = (sy_call_t *) filemon_wrapper_open;
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sv_table[SYS_openat].sy_call = (sy_call_t *) filemon_wrapper_openat;
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sv_table[SYS_rename].sy_call = (sy_call_t *) filemon_wrapper_rename;
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sv_table[SYS_symlink].sy_call = (sy_call_t *) filemon_wrapper_symlink;
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sv_table[SYS_unlink].sy_call = (sy_call_t *) filemon_wrapper_unlink;
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sv_table[SYS_vfork].sy_call = (sy_call_t *) filemon_wrapper_vfork;
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}
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int
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filemon_wrapper_deinstall(void)
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{
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struct sysent *sv_table = curproc->p_emul->e_sysent;
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if (sv_table[SYS_chdir].sy_call != (sy_call_t *) filemon_wrapper_chdir)
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return EBUSY;
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sv_table[SYS_chdir].sy_call = (sy_call_t *) sys_chdir;
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sv_table[SYS_execve].sy_call = (sy_call_t *) sys_execve;
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sv_table[SYS_exit].sy_call = (sy_call_t *) sys_exit;
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sv_table[SYS_fork].sy_call = (sy_call_t *) sys_fork;
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sv_table[SYS_link].sy_call = (sy_call_t *) sys_link;
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sv_table[SYS_open].sy_call = (sy_call_t *) sys_open;
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sv_table[SYS_openat].sy_call = (sy_call_t *) sys_openat;
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sv_table[SYS_rename].sy_call = (sy_call_t *) sys_rename;
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sv_table[SYS_symlink].sy_call = (sy_call_t *) sys_symlink;
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sv_table[SYS_unlink].sy_call = (sy_call_t *) sys_unlink;
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sv_table[SYS_vfork].sy_call = (sy_call_t *) sys_vfork;
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return 0;
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}
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