264 lines
6.9 KiB
C
264 lines
6.9 KiB
C
/* $NetBSD: compat_util.c,v 1.14 1999/04/27 15:42:37 christos Exp $ */
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/*-
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* Copyright (c) 1994 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Christos Zoulas and Frank van der Linden.
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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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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the NetBSD
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* Foundation, Inc. and its contributors.
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* 4. Neither the name of The NetBSD Foundation nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/namei.h>
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#include <sys/proc.h>
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#include <sys/file.h>
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#include <sys/stat.h>
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#include <sys/filedesc.h>
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#include <sys/exec.h>
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#include <sys/ioctl.h>
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#include <sys/kernel.h>
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#include <sys/malloc.h>
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#include <sys/vnode.h>
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#include <sys/syslog.h>
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#include <sys/mount.h>
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#include <vm/vm_param.h>
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#include <compat/common/compat_util.h>
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/*
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* Search an alternate path before passing pathname arguments on
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* to system calls. Useful for keeping a separate 'emulation tree'.
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*
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* If cflag is set, we check if an attempt can be made to create
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* the named file, i.e. we check if the directory it should
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* be in exists.
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*
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* In case of success, emul_find returns 0:
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* If sgp is provided, the path is in user space, and pbuf gets
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* allocated in user space (in the stackgap). Otherwise the path
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* is already in kernel space and a kernel buffer gets allocated
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* and returned in pbuf, that must be freed by the user.
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* In case of error, the error number is returned and *pbuf = path.
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*/
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int
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emul_find(p, sgp, prefix, path, pbuf, cflag)
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struct proc *p;
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caddr_t *sgp; /* Pointer to stackgap memory */
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const char *prefix;
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const char *path;
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const char **pbuf;
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int cflag;
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{
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struct nameidata nd;
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struct nameidata ndroot;
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struct vattr vat;
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struct vattr vatroot;
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int error;
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char *ptr, *buf, *cp;
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const char *pr;
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size_t sz, len;
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buf = (char *)malloc(MAXPATHLEN, M_TEMP, M_WAITOK);
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*pbuf = path;
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for (ptr = buf, pr = prefix; (*ptr = *pr) != '\0'; ptr++, pr++)
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continue;
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sz = MAXPATHLEN - (ptr - buf);
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/*
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* If sgp is not given then the path is already in kernel space
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*/
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if (sgp == NULL)
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error = copystr(path, ptr, sz, &len);
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else
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error = copyinstr(path, ptr, sz, &len);
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if (error)
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goto bad;
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if (*ptr != '/') {
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error = EINVAL;
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goto bad;
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}
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/*
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* We provide an escape method, so that the user can
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* always specify the real root. If the path is prefixed
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* by /../ we kill the alternate search
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*/
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if (ptr[1] == '.' && ptr[2] == '.' && ptr[3] == '/') {
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len -= 3;
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(void)memcpy(buf, &ptr[3], len);
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ptr = buf;
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goto good;
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}
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/*
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* We know that there is a / somewhere in this pathname.
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* Search backwards for it, to find the file's parent dir
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* to see if it exists in the alternate tree. If it does,
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* and we want to create a file (cflag is set). We don't
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* need to worry about the root comparison in this case.
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*/
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if (cflag) {
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for (cp = &ptr[len] - 1; *cp != '/'; cp--)
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;
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*cp = '\0';
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NDINIT(&nd, LOOKUP, FOLLOW, UIO_SYSSPACE, buf, p);
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if ((error = namei(&nd)) != 0)
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goto bad;
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*cp = '/';
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}
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else {
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NDINIT(&nd, LOOKUP, FOLLOW, UIO_SYSSPACE, buf, p);
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if ((error = namei(&nd)) != 0)
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goto bad;
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/*
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* We now compare the vnode of the emulation root to the one
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* vnode asked. If they resolve to be the same, then we
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* ignore the match so that the real root gets used.
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* This avoids the problem of traversing "../.." to find the
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* root directory and never finding it, because "/" resolves
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* to the emulation root directory. This is expensive :-(
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*/
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NDINIT(&ndroot, LOOKUP, FOLLOW, UIO_SYSSPACE, prefix, p);
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if ((error = namei(&ndroot)) != 0)
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goto bad2;
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if ((error = VOP_GETATTR(nd.ni_vp, &vat, p->p_ucred, p)) != 0)
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goto bad3;
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if ((error = VOP_GETATTR(ndroot.ni_vp, &vatroot, p->p_ucred, p))
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!= 0)
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goto bad3;
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if (vat.va_fsid == vatroot.va_fsid &&
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vat.va_fileid == vatroot.va_fileid) {
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error = ENOENT;
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goto bad3;
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}
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}
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vrele(nd.ni_vp);
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if (!cflag)
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vrele(ndroot.ni_vp);
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good:
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if (sgp == NULL)
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*pbuf = buf;
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else {
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sz = &ptr[len] - buf;
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*pbuf = stackgap_alloc(sgp, sz + 1);
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if ((error = copyout(buf, (void *)*pbuf, sz)) != 0) {
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*pbuf = path;
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return error;
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}
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free(buf, M_TEMP);
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}
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return 0;
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bad3:
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vrele(ndroot.ni_vp);
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bad2:
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vrele(nd.ni_vp);
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bad:
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free(buf, M_TEMP);
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return error;
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}
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/*
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* Translate one set of flags to another, based on the entries in
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* the given table. If 'leftover' is specified, it is filled in
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* with any flags which could not be translated.
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*/
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unsigned long
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emul_flags_translate(const struct emul_flags_xtab *tab,
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unsigned long in, unsigned long *leftover)
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{
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unsigned long out;
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for (out = 0; tab->omask != 0; tab++) {
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if ((in & tab->omask) == tab->oval) {
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in &= ~tab->omask;
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out |= tab->nval;
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}
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}
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if (leftover != NULL)
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*leftover = in;
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return (out);
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}
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caddr_t
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stackgap_init(e)
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struct emul *e;
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{
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#define szsigcode ((caddr_t)(e->e_esigcode - e->e_sigcode))
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return STACKGAPBASE;
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#undef szsigcode
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}
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void *
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stackgap_alloc(sgp, sz)
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caddr_t *sgp;
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size_t sz;
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{
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void *p = (void *) *sgp;
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*sgp += ALIGN(sz);
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return p;
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}
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void
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compat_offseterr(vp, msg)
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struct vnode *vp;
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char *msg;
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{
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struct mount *mp;
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mp = vp->v_mount;
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log(LOG_ERR, "%s: dir offset too large on fs %s (mounted from %s)\n",
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msg, mp->mnt_stat.f_mntonname, mp->mnt_stat.f_mntfromname);
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uprintf("%s: dir offset too large for emulated program\n", msg);
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}
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