/*-
 * SPDX-License-Identifier: BSD-3-Clause
 *
 * Copyright (c) 1982, 1986, 1989, 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. 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.
 */

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/sysproto.h>
#include <sys/kernel.h>
#include <sys/priv.h>
#include <sys/proc.h>
#include <sys/lock.h>
#include <sys/mutex.h>
#include <sys/socket.h>
#include <sys/sysctl.h>
#include <sys/utsname.h>

#include <vm/vm_param.h>

#if defined(COMPAT_43)

int
ogethostname(struct thread *td, struct ogethostname_args *uap)
{
        int name[2];
        size_t len = uap->len;

        name[0] = CTL_KERN;
        name[1] = KERN_HOSTNAME;
        return (userland_sysctl(td, name, 2, uap->hostname, &len,
            1, 0, 0, 0, 0));
}

int
osethostname(struct thread *td, struct osethostname_args *uap)
{
        int name[2];

        name[0] = CTL_KERN;
        name[1] = KERN_HOSTNAME;
        return (userland_sysctl(td, name, 2, 0, 0, 0, uap->hostname,
            uap->len, 0, 0));
}

#ifndef _SYS_SYSPROTO_H_
struct ogethostid_args {
        int     dummy;
};
#endif
/* ARGSUSED */
int
ogethostid(struct thread *td, struct ogethostid_args *uap)
{
        size_t len = sizeof(long);
        int name[2];

        name[0] = CTL_KERN;
        name[1] = KERN_HOSTID;
        return (kernel_sysctl(td, name, 2, (long *)td->td_retval, &len,
            NULL, 0, NULL, 0));
}

int
osethostid(struct thread *td, struct osethostid_args *uap)
{
        int name[2];

        name[0] = CTL_KERN;
        name[1] = KERN_HOSTID;
        return (kernel_sysctl(td, name, 2, NULL, NULL, &uap->hostid,
            sizeof(uap->hostid), NULL, 0));
}

int
oquota(struct thread *td, struct oquota_args *uap)
{

        return (ENOSYS);
}

#define KINFO_PROC              (0<<8)
#define KINFO_RT                (1<<8)
/* UNUSED, was KINFO_VNODE (2<<8) */
#define KINFO_FILE              (3<<8)
#define KINFO_METER             (4<<8)
#define KINFO_LOADAVG           (5<<8)
#define KINFO_CLOCKRATE         (6<<8)

/* Non-standard BSDI extension - only present on their 4.3 net-2 releases */
#define KINFO_BSDI_SYSINFO      (101<<8)

/*
 * XXX this is bloat, but I hope it's better here than on the potentially
 * limited kernel stack...  -Peter
 */

static struct {
        int     bsdi_machine;           /* "i386" on BSD/386 */
/*      ^^^ this is an offset to the string, relative to the struct start */
        char    *pad0;
        long    pad1;
        long    pad2;
        long    pad3;
        u_long  pad4;
        u_long  pad5;
        u_long  pad6;

        int     bsdi_ostype;            /* "BSD/386" on BSD/386 */
        int     bsdi_osrelease;         /* "1.1" on BSD/386 */
        long    pad7;
        long    pad8;
        char    *pad9;

        long    pad10;
        long    pad11;
        int     pad12;
        long    pad13;
        quad_t  pad14;
        long    pad15;

        struct  timeval pad16;
        /* we dont set this, because BSDI's uname used gethostname() instead */
        int     bsdi_hostname;          /* hostname on BSD/386 */

        /* the actual string data is appended here */

} bsdi_si;

/*
 * this data is appended to the end of the bsdi_si structure during copyout.
 * The "char *" offsets are relative to the base of the bsdi_si struct.
 * This contains "FreeBSD\02.0-BUILT-nnnnnn\0i386\0", and these strings
 * should not exceed the length of the buffer here... (or else!! :-)
 */
static char bsdi_strings[80];   /* It had better be less than this! */

int
ogetkerninfo(struct thread *td, struct ogetkerninfo_args *uap)
{
        int error, name[6];
        size_t size;
        u_int needed = 0;

        switch (uap->op & 0xff00) {
        case KINFO_RT:
                name[0] = CTL_NET;
                name[1] = PF_ROUTE;
                name[2] = 0;
                name[3] = (uap->op & 0xff0000) >> 16;
                name[4] = uap->op & 0xff;
                name[5] = uap->arg;
                error = userland_sysctl(td, name, 6, uap->where, uap->size,
                        0, 0, 0, &size, 0);
                break;

        case KINFO_PROC:
                name[0] = CTL_KERN;
                name[1] = KERN_PROC;
                name[2] = uap->op & 0xff;
                name[3] = uap->arg;
                error = userland_sysctl(td, name, 4, uap->where, uap->size,
                        0, 0, 0, &size, 0);
                break;

        case KINFO_FILE:
                name[0] = CTL_KERN;
                name[1] = KERN_FILE;
                error = userland_sysctl(td, name, 2, uap->where, uap->size,
                        0, 0, 0, &size, 0);
                break;

        case KINFO_METER:
                name[0] = CTL_VM;
                name[1] = VM_TOTAL;
                error = userland_sysctl(td, name, 2, uap->where, uap->size,
                        0, 0, 0, &size, 0);
                break;

        case KINFO_LOADAVG:
                name[0] = CTL_VM;
                name[1] = VM_LOADAVG;
                error = userland_sysctl(td, name, 2, uap->where, uap->size,
                        0, 0, 0, &size, 0);
                break;

        case KINFO_CLOCKRATE:
                name[0] = CTL_KERN;
                name[1] = KERN_CLOCKRATE;
                error = userland_sysctl(td, name, 2, uap->where, uap->size,
                        0, 0, 0, &size, 0);
                break;

        case KINFO_BSDI_SYSINFO: {
                /*
                 * this is pretty crude, but it's just enough for uname()
                 * from BSDI's 1.x libc to work.
                 *
                 * *size gives the size of the buffer before the call, and
                 * the amount of data copied after a successful call.
                 * If successful, the return value is the amount of data
                 * available, which can be larger than *size.
                 *
                 * BSDI's 2.x product apparently fails with ENOMEM if *size
                 * is too small.
                 */

                u_int left;
                char *s;

                bzero((char *)&bsdi_si, sizeof(bsdi_si));
                bzero(bsdi_strings, sizeof(bsdi_strings));

                s = bsdi_strings;

                bsdi_si.bsdi_ostype = (s - bsdi_strings) + sizeof(bsdi_si);
                strcpy(s, ostype);
                s += strlen(s) + 1;

                bsdi_si.bsdi_osrelease = (s - bsdi_strings) + sizeof(bsdi_si);
                strcpy(s, osrelease);
                s += strlen(s) + 1;

                bsdi_si.bsdi_machine = (s - bsdi_strings) + sizeof(bsdi_si);
                strcpy(s, machine);
                s += strlen(s) + 1;

                needed = sizeof(bsdi_si) + (s - bsdi_strings);

                if ((uap->where == NULL) || (uap->size == NULL)) {
                        /* process is asking how much buffer to supply.. */
                        size = needed;
                        error = 0;
                        break;
                }

                if ((error = copyin(uap->size, &size, sizeof(size))) != 0)
                        break;

                /* if too much buffer supplied, trim it down */
                if (size > needed)
                        size = needed;

                /* how much of the buffer is remaining */
                left = size;

                if ((error = copyout((char *)&bsdi_si, uap->where, left)) != 0)
                        break;

                /* is there any point in continuing? */
                if (left > sizeof(bsdi_si)) {
                        left -= sizeof(bsdi_si);
                        error = copyout(&bsdi_strings,
                                        uap->where + sizeof(bsdi_si), left);
                }
                break;
        }

        default:
                error = EOPNOTSUPP;
                break;
        }
        if (error == 0) {
                td->td_retval[0] = needed ? needed : size;
                if (uap->size) {
                        error = copyout(&size, uap->size, sizeof(size));
                }
        }
        return (error);
}
#endif /* COMPAT_43 */

#ifdef COMPAT_FREEBSD4
/*
 * This is the FreeBSD-1.1 compatible uname(2) interface.  These days it is
 * done in libc as a wrapper around a bunch of sysctl's.  This must maintain
 * the old 1.1 binary ABI.
 */
#if SYS_NMLN != 32
#error "FreeBSD-1.1 uname syscall has been broken"
#endif
#ifndef _SYS_SYSPROTO_H_
struct uname_args {
        struct utsname  *name;
};
#endif
/* ARGSUSED */
int
freebsd4_uname(struct thread *td, struct freebsd4_uname_args *uap)
{
        int name[2], error;
        size_t len;
        const char *s;
        char *us;

        name[0] = CTL_KERN;
        name[1] = KERN_OSTYPE;
        len = sizeof (uap->name->sysname);
        error = userland_sysctl(td, name, 2, uap->name->sysname, &len, 
                1, 0, 0, 0, 0);
        if (error)
                return (error);
        error = subyte(uap->name->sysname + sizeof(uap->name->sysname) - 1, 0);
        if (error)
                return (EFAULT);

        name[1] = KERN_HOSTNAME;
        len = sizeof uap->name->nodename;
        error = userland_sysctl(td, name, 2, uap->name->nodename, &len, 
                1, 0, 0, 0, 0);
        if (error)
                return (error);
        error = subyte(uap->name->nodename + sizeof(uap->name->nodename) - 1, 0);
        if (error)
                return (EFAULT);

        name[1] = KERN_OSRELEASE;
        len = sizeof uap->name->release;
        error = userland_sysctl(td, name, 2, uap->name->release, &len, 
                1, 0, 0, 0, 0);
        if (error)
                return (error);
        error = subyte(uap->name->release + sizeof(uap->name->release) - 1, 0);
        if (error)
                return (EFAULT);

/*
        name = KERN_VERSION;
        len = sizeof uap->name->version;
        error = userland_sysctl(td, name, 2, uap->name->version, &len, 
                1, 0, 0, 0, 0);
        if (error)
                return (error);
        subyte( uap->name->version + sizeof(uap->name->version) - 1, 0);
*/

/*
 * this stupid hackery to make the version field look like FreeBSD 1.1
 */
        for(s = version; *s && *s != '#'; s++);

        for(us = uap->name->version; *s && *s != ':'; s++) {
                if (subyte(us++, *s) != 0)
                        return (EFAULT);
        }
        if (subyte(us++, 0) != 0)
                return (EFAULT);

        name[0] = CTL_HW;
        name[1] = HW_MACHINE;
        len = sizeof uap->name->machine;
        error = userland_sysctl(td, name, 2, uap->name->machine, &len, 
                1, 0, 0, 0, 0);
        if (error)
                return (error);
        error = subyte(uap->name->machine + sizeof(uap->name->machine) - 1, 0);
        if (error)
                return (EFAULT);
        return (0);
}

#ifndef _SYS_SYSPROTO_H_
struct getdomainname_args {
        char    *domainname;
        int     len;
};
#endif
/* ARGSUSED */
int
freebsd4_getdomainname(struct thread *td,
    struct freebsd4_getdomainname_args *uap)
{
        int name[2];
        size_t len = uap->len;

        name[0] = CTL_KERN;
        name[1] = KERN_NISDOMAINNAME;
        return (userland_sysctl(td, name, 2, uap->domainname, &len,
            1, 0, 0, 0, 0));
}

#ifndef _SYS_SYSPROTO_H_
struct setdomainname_args {
        char    *domainname;
        int     len;
};
#endif
/* ARGSUSED */
int
freebsd4_setdomainname(struct thread *td,
    struct freebsd4_setdomainname_args *uap)
{
        int name[2];

        name[0] = CTL_KERN;
        name[1] = KERN_NISDOMAINNAME;
        return (userland_sysctl(td, name, 2, 0, 0, 0, uap->domainname,
            uap->len, 0, 0));
}
#endif /* COMPAT_FREEBSD4 */