/*      $NetBSD: compat_util.c,v 1.47 2019/01/27 02:08:39 pgoyette Exp $        */

/*-
* Copyright (c) 1994 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Christos Zoulas and Frank van der Linden.
*
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. 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 FOUNDATION 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.
*/

/*
* Copyright (c) 2008, 2009 Matthew R. Green
* 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. The name of the author may not be used to endorse or promote products
*    derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
*/

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: compat_util.c,v 1.47 2019/01/27 02:08:39 pgoyette Exp $");

#if defined(_KERNEL_OPT)
#include "opt_compat_netbsd.h"
#endif

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/namei.h>
#include <sys/proc.h>
#include <sys/file.h>
#include <sys/stat.h>
#include <sys/filedesc.h>
#include <sys/exec.h>
#include <sys/ioctl.h>
#include <sys/kernel.h>
#include <sys/vnode.h>
#include <sys/syslog.h>
#include <sys/mount.h>
#include <sys/module.h>

#include <compat/common/compat_util.h>

/*
* Translate one set of flags to another, based on the entries in
* the given table.  If 'leftover' is specified, it is filled in
* with any flags which could not be translated.
*/
unsigned long
emul_flags_translate(const struct emul_flags_xtab *tab,
                    unsigned long in, unsigned long *leftover)
{
       unsigned long out;

       for (out = 0; tab->omask != 0; tab++) {
               if ((in & tab->omask) == tab->oval) {
                       in &= ~tab->omask;
                       out |= tab->nval;
               }
       }
       if (leftover != NULL)
               *leftover = in;
       return (out);
}

void
compat_offseterr(struct vnode *vp, const char *msg)
{
       struct mount *mp;

       mp = vp->v_mount;

       log(LOG_ERR, "%s: dir offset too large on fs %s (mounted from %s)\n",
           msg, mp->mnt_stat.f_mntonname, mp->mnt_stat.f_mntfromname);
       uprintf("%s: dir offset too large for emulated program\n", msg);
}

/*
* Look for native NetBSD compatibility libraries, usually interp-ABI.
* It returns 0 if it changed the interpreter, otherwise it returns
* the error from namei().  Callers should not try any more processing
* if this returns 0, and probably should just ignore the return value.
*/
int
compat_elf_check_interp(struct exec_package *epp,
                       char *interp,
                       const char *interp_suffix)
{
       int error = 0;

       /*
        * Don't look for something else, if someone has already found and
        * setup the ep_interp already.
        */
       if (interp && epp->ep_interp == NULL) {
               /*
                * If the path is exactly "/usr/libexec/ld.elf_so", first
                * try to see if "/usr/libexec/ld.elf_so-<abi>" exists
                * and if so, use that instead.
                */
               if (strcmp(interp, "/usr/libexec/ld.elf_so") == 0 ||
                   strcmp(interp, "/libexec/ld.elf_so") == 0) {
                       struct vnode *vp;
                       char *path;

                       path = PNBUF_GET();
                       snprintf(path, MAXPATHLEN, "%s-%s", interp, interp_suffix);
                       error = namei_simple_kernel(path,
                                       NSM_FOLLOW_NOEMULROOT, &vp);
                       /*
                        * If that worked, replace interpreter in case we
                        * actually need to load it.
                        */
                       if (error == 0) {
                               epp->ep_interp = vp;
                               snprintf(interp, MAXPATHLEN, "%s", path);
                       }
                       PNBUF_PUT(path);
               }
       }
       return error;
}

MODULE(MODULE_CLASS_MISC, compat_util, NULL);

int
compat_util_modcmd(modcmd_t cmd, void *arg)
{

       switch (cmd) {
       case MODULE_CMD_INIT:
       case MODULE_CMD_FINI:
               return 0;
       default:
               return ENOTTY;
       }
}

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