/*      $NetBSD: freebsd_sysctl.c,v 1.19 2015/02/14 07:37:19 dholland Exp $     */

/*-
* Copyright (c) 2005 The NetBSD Foundation, Inc.
* 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.
*
* 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.
*/

/*
* FreeBSD compatibility module. Try to deal with various FreeBSD sysctl calls.
*/

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: freebsd_sysctl.c,v 1.19 2015/02/14 07:37:19 dholland Exp $");

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/proc.h>
#include <sys/mount.h>
#include <sys/signal.h>
#include <sys/signalvar.h>
#include <sys/malloc.h>
#include <sys/mman.h>
#include <sys/sysctl.h>
#include <sys/ktrace.h>

#include <sys/syscallargs.h>

#include <compat/freebsd/freebsd_syscallargs.h>
#include <compat/common/compat_util.h>
#include <compat/freebsd/freebsd_rtprio.h>
#include <compat/freebsd/freebsd_timex.h>
#include <compat/freebsd/freebsd_signal.h>
#include <compat/freebsd/freebsd_mman.h>
#include <compat/freebsd/freebsd_sysctl.h>

static int freebsd_sysctl_name2oid(char *, int *, int *);

static struct sysctllog *freebsd_clog;

void
freebsd_sysctl_init(void)
{

       sysctl_createv(&freebsd_clog, 0, NULL, NULL,
                       CTLFLAG_PERMANENT|CTLFLAG_IMMEDIATE,
                       CTLTYPE_INT, "osreldate",
                       SYSCTL_DESCR("Operating system revision"),
                       NULL, __NetBSD_Version__, NULL, 0,
                       CTL_KERN, CTL_CREATE, CTL_EOL);
}

void
freebsd_sysctl_fini(void)
{

       sysctl_teardown(&freebsd_clog);
}

int
freebsd_sys_sysctl(struct lwp *l, const struct freebsd_sys_sysctl_args *uap, register_t *retval)
{
       /* {
               syscallarg(int *) name;
               syscallarg(u_int) namelen;
               syscallarg(void *) old;
               syscallarg(size_t *) oldlenp;
               syscallarg(void *) new;
               syscallarg(size_t) newlen;
       } */
       int error;
       int name[CTL_MAXNAME];
       size_t newlen, *oldlenp, oldlen;
       u_int namelen;
       void *new, *old;

       namelen = SCARG(uap, namelen);

       if ((namelen > CTL_MAXNAME) || (namelen < 1))
               return EINVAL;

       if ((error = copyin(SCARG(uap, name), name,
           namelen * sizeof(*name))) != 0)
               return error;

       if (namelen > 0 && name[0] != 0)
               return(sys___sysctl(l, (const void *)uap, retval));

       ktrmib(name, namelen);

       /*
        * FreeBSD sysctl uses an undocumented set of special OIDs in its
        * sysctl MIB whose tree is rooted at oid 0.  These OIDs are
        * interpreted by their sysctl to implement functions that NetBSD
        * performs in libc, such as sysctlgetmibinfo.
        *
        * From the FreeBSD kern_sysctl.c, these OIDs are:
        * {0,0}        printf the entire MIB-tree.
        * {0,1,...}    return the name of the "..." OID.
        * {0,2,...}    return the next OID.
        * {0,3}        return the OID of the name in "new"
        * {0,4,...}    return the kind & format info for the "..." OID.
        * {0,5,...}    return the description the "..." OID.
        *
        * Only implement {0,3} for now.
        */

       if (namelen < 2 || namelen > CTL_MAXNAME)
               return(EINVAL);

       if (name[1] == 3) {
               char *locnew;
               int oid[CTL_MAXNAME];
               u_int oidlen = CTL_MAXNAME;

               new = SCARG(uap, new);
               newlen = SCARG(uap, newlen);
               if (new == NULL || newlen < 1 ||
                   newlen > (SYSCTL_NAMELEN * CTL_MAXNAME))
                       return(EINVAL);

               old = SCARG(uap, old);
               oldlenp = SCARG(uap, oldlenp);
               if (old == NULL || oldlenp == NULL)
                       return(EINVAL);

               if ((error = copyin(oldlenp, &oldlen, sizeof(oldlen))))
                       return (error);
               if (oldlen < sizeof(int))
                       return (EINVAL);

               if ((locnew =
                    (char *) malloc(newlen + 1, M_TEMP, M_WAITOK)) == NULL)
                       return(ENOMEM);

               if ((error = copyinstr(new, locnew, newlen + 1, NULL))) {
                       free(locnew, M_TEMP);
                       return(error);
               }

               ktrmibio(-1, UIO_WRITE, new, newlen + 1, error);
               sysctl_lock(new != NULL);
               error = freebsd_sysctl_name2oid(locnew, oid, &oidlen);
               sysctl_unlock();
               free(locnew, M_TEMP);
               if (error)
                       return(error);

               oidlen *= sizeof(int);
               error = copyout(oid, SCARG(uap, old),
                               MIN(oidlen, oldlen));
               if (error)
                       return(error);
               ktrmibio(-1, UIO_READ, SCARG(uap, old),
                   MIN(oidlen, oldlen),  0);

               error = copyout(&oidlen, SCARG(uap, oldlenp), sizeof(u_int));

               return(error);
       }

       return(EOPNOTSUPP);
}

static int
freebsd_sysctl_name2oid(char *name, int *oid, int *oidlen)
{
       char *dot;
       int oi, ci;
       struct sysctlnode *node, *pnode;

       pnode = &sysctl_root;
       node = sysctl_root.sysctl_child;
       oi = 0;
       if ((dot = strchr(name, (int)'.')) != NULL)
               *dot++ = '\0';

next:
       while (*name != '\0' && node != NULL) {
               for (ci = 0; ci < pnode->sysctl_clen; ci++) {
                       if (strcmp(name, node[ci].sysctl_name) == 0) {
                               oid[oi++] = node[ci].sysctl_num;
                               if ((name = dot) == NULL) {
                                       *oidlen = oi;
                                       return(0);
                               }
                               if ((dot = strchr(name, (int)'.')) != NULL)
                                       *dot++ = '\0';

                               if (SYSCTL_TYPE(node[ci].sysctl_flags) !=
                                   CTLTYPE_NODE)
                                       return(ENOTDIR);

                               pnode = &node[ci];
                               node = pnode->sysctl_child;
                               goto next;
                       }
               }

               /* no more nodes, it must not exist */
               break;
       }

       return(ENOENT);
}

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