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/* $OpenBSD: kvm_file.c,v 1.7 2002/11/29 20:15:43 deraadt Exp $ */
/* $NetBSD: kvm_file.c,v 1.5 1996/03/18 22:33:18 thorpej Exp $ */
/*-
* Copyright (c) 1989, 1992, 1993
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#if defined(LIBC_SCCS) && !defined(lint)
#if 0
static char sccsid[] = "@(#)kvm_file.c 8.1 (Berkeley) 6/4/93";
#else
static char *rcsid = "$OpenBSD: kvm_file.c,v 1.7 2002/11/29 20:15:43 deraadt Exp $";
#endif
#endif /* LIBC_SCCS and not lint */
/*
* File list interface for kvm. pstat, fstat and netstat are
* users of this code, so we've factored it out into a separate module.
* Thus, we keep this grunge out of the other kvm applications (i.e.,
* most other applications are interested only in open/close/read/nlist).
*/
#include <sys/param.h>
#include <sys/user.h>
#include <sys/proc.h>
#include <sys/exec.h>
#define _KERNEL
#include <sys/file.h>
#undef _KERNEL
#include <sys/stat.h>
#include <sys/ioctl.h>
#include <sys/tty.h>
#include <nlist.h>
#include <kvm.h>
#include <sys/sysctl.h>
#include <limits.h>
#include <ndbm.h>
#include <paths.h>
#include "kvm_private.h"
#define KREAD(kd, addr, obj) \
(kvm_read(kd, addr, obj, sizeof(*obj)) != sizeof(*obj))
/*
* Get file structures.
*/
static
kvm_deadfiles(kd, op, arg, filehead_o, nfiles)
kvm_t *kd;
int op, arg, nfiles;
long filehead_o;
{
int buflen = kd->arglen, needed = buflen, error, n = 0;
struct file *fp, file;
struct filelist filehead;
register char *where = kd->argspc;
char *start = where;
/*
* first copyout filehead
*/
if (buflen > sizeof (filehead)) {
if (KREAD(kd, filehead_o, &filehead)) {
_kvm_err(kd, kd->program, "can't read filehead");
return (0);
}
buflen -= sizeof (filehead);
where += sizeof (filehead);
*(struct filelist *)kd->argspc = filehead;
}
/*
* followed by an array of file structures
*/
for (fp = filehead.lh_first; fp != 0; fp = fp->f_list.le_next) {
if (buflen > sizeof (struct file)) {
if (KREAD(kd, (long)fp, ((struct file *)where))) {
_kvm_err(kd, kd->program, "can't read kfp");
return (0);
}
buflen -= sizeof (struct file);
fp = (struct file *)where;
where += sizeof (struct file);
n++;
}
}
if (n != nfiles) {
_kvm_err(kd, kd->program, "inconsistent nfiles");
return (0);
}
return (nfiles);
}
char *
kvm_getfiles(kd, op, arg, cnt)
kvm_t *kd;
int op, arg;
int *cnt;
{
size_t size;
int mib[2], st, nfiles;
struct file *fp, *fplim;
struct filelist filehead;
if (ISALIVE(kd)) {
size = 0;
mib[0] = CTL_KERN;
mib[1] = KERN_FILE;
st = sysctl(mib, 2, NULL, &size, NULL, 0);
if (st == -1) {
_kvm_syserr(kd, kd->program, "kvm_getfiles");
return (0);
}
if (kd->argspc == 0)
kd->argspc = (char *)_kvm_malloc(kd, size);
else if (kd->arglen < size)
kd->argspc = (char *)_kvm_realloc(kd, kd->argspc, size);
if (kd->argspc == 0)
return (0);
kd->arglen = size;
st = sysctl(mib, 2, kd->argspc, &size, NULL, 0);
if (st == -1 || size < sizeof(filehead)) {
_kvm_syserr(kd, kd->program, "kvm_getfiles");
return (0);
}
filehead = *(struct filelist *)kd->argspc;
fp = (struct file *)(kd->argspc + sizeof (filehead));
fplim = (struct file *)(kd->argspc + size);
for (nfiles = 0; filehead.lh_first && (fp < fplim);
nfiles++, fp++)
filehead.lh_first = fp->f_list.le_next;
} else {
struct nlist nl[3], *p;
nl[0].n_name = "_filehead";
nl[1].n_name = "_nfiles";
nl[2].n_name = 0;
if (kvm_nlist(kd, nl) != 0) {
for (p = nl; p->n_type != 0; ++p)
;
_kvm_err(kd, kd->program,
"%s: no such symbol", p->n_name);
return (0);
}
if (KREAD(kd, nl[0].n_value, &nfiles)) {
_kvm_err(kd, kd->program, "can't read nfiles");
return (0);
}
size = sizeof(filehead) + (nfiles + 10) * sizeof(struct file);
if (kd->argspc == 0)
kd->argspc = (char *)_kvm_malloc(kd, size);
else if (kd->arglen < size)
kd->argspc = (char *)_kvm_realloc(kd, kd->argspc, size);
if (kd->argspc == 0)
return (0);
kd->arglen = size;
nfiles = kvm_deadfiles(kd, op, arg, nl[1].n_value, nfiles);
if (nfiles == 0)
return (0);
}
*cnt = nfiles;
return (kd->argspc);
}
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