/*-
 * SPDX-License-Identifier: BSD-2-Clause
 *
 * Copyright (c) 2000-2001 Boris Popov
 * 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 AUTHOR 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 AUTHOR 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/kernel.h>
#include <sys/clock.h>
#include <sys/malloc.h>
#include <sys/time.h>
#include <sys/vnode.h>
#include <sys/sysctl.h>
#include <sys/iconv.h>

#include <netsmb/smb.h>
#include <netsmb/smb_conn.h>
#include <netsmb/smb_subr.h>
#include <netsmb/smb_rq.h>
#include <netsmb/smb_dev.h>

#include <fs/smbfs/smbfs.h>
#include <fs/smbfs/smbfs_node.h>
#include <fs/smbfs/smbfs_subr.h>

MALLOC_DEFINE(M_SMBFSDATA, "smbfs_data", "SMBFS private data");
MALLOC_DEFINE(M_SMBFSCRED, "smbfs_cred", "SMBFS cred data");

void
smb_time_local2server(struct timespec *tsp, int tzoff, u_long *seconds)
{
        *seconds = tsp->tv_sec - tzoff * 60 /*- tz_minuteswest * 60 -
            (wall_cmos_clock ? adjkerntz : 0)*/;
}

void
smb_time_server2local(u_long seconds, int tzoff, struct timespec *tsp)
{
        tsp->tv_sec = seconds + tzoff * 60;
}

/*
 * Number of seconds between 1970 and 1601 year
 */
static int64_t DIFF1970TO1601 = 11644473600ULL;

/*
 * Time from server comes as UTC, so no need to use tz
 */
void
smb_time_NT2local(int64_t nsec, int tzoff, struct timespec *tsp)
{
        smb_time_server2local(nsec / 10000000 - DIFF1970TO1601, 0, tsp);
}

void
smb_time_local2NT(struct timespec *tsp, int tzoff, int64_t *nsec)
{
        u_long seconds;

        smb_time_local2server(tsp, 0, &seconds);
        *nsec = (((int64_t)(seconds) & ~1) + DIFF1970TO1601) * (int64_t)10000000;
}

void
smb_time_unix2dos(struct timespec *tsp, int tzoff, u_int16_t *ddp, 
        u_int16_t *dtp, u_int8_t *dhp)
{
        struct timespec tt;
        u_long t;

        tt = *tsp;
        smb_time_local2server(tsp, tzoff, &t);
        tt.tv_sec = t;
        timespec2fattime(&tt, 1, ddp, dtp, dhp);
}

void
smb_dos2unixtime(u_int dd, u_int dt, u_int dh, int tzoff,
        struct timespec *tsp)
{

        fattime2timespec(dd, dt, dh, 1, tsp);
        smb_time_server2local(tsp->tv_sec, tzoff, tsp);
}

int
smbfs_fullpath(struct mbchain *mbp, struct smb_vc *vcp, struct smbnode *dnp,
        const char *name, int nmlen)
{
        int caseopt = SMB_CS_NONE;
        int error;

        if (SMB_UNICODE_STRINGS(vcp)) {
                error = mb_put_padbyte(mbp);
                if (error)
                        return error;
        }
        if (SMB_DIALECT(vcp) < SMB_DIALECT_LANMAN1_0)
                caseopt |= SMB_CS_UPPER;
        if (dnp != NULL) {
                error = smb_put_dmem(mbp, vcp, dnp->n_rpath, dnp->n_rplen, 
                    caseopt);
                if (error)
                        return error;
                if (name) {
                        /* Put the separator */
                        if (SMB_UNICODE_STRINGS(vcp))
                                error = mb_put_uint16le(mbp, '\\');
                        else
                                error = mb_put_uint8(mbp, '\\');
                        if (error)
                                return error;
                        /* Put the name */
                        error = smb_put_dmem(mbp, vcp, name, nmlen, caseopt);
                        if (error)
                                return error;
                }
        }
        /* Put NULL terminator. */
        if (SMB_UNICODE_STRINGS(vcp))
                error = mb_put_uint16le(mbp, 0);
        else
                error = mb_put_uint8(mbp, 0);
        return error;
}

int
smbfs_fname_tolocal(struct smb_vc *vcp, char *name, int *nmlen, int caseopt)
{
        int copt = (caseopt == SMB_CS_LOWER ? KICONV_FROM_LOWER : 
                    (caseopt == SMB_CS_UPPER ? KICONV_FROM_UPPER : 0));
        int error = 0;
        size_t ilen = *nmlen;
        size_t olen;
        char *ibuf = name;
        char outbuf[SMB_MAXFNAMELEN];
        char *obuf = outbuf;

        if (vcp->vc_tolocal) {
                olen = sizeof(outbuf);
                bzero(outbuf, sizeof(outbuf));

                /*
                error = iconv_conv_case
                        (vcp->vc_tolocal, NULL, NULL, &obuf, &olen, copt);
                if (error) return error;
                */

                error = iconv_conv_case(vcp->vc_tolocal,
                    __DECONST(const char **, &ibuf), &ilen, &obuf, &olen, copt);
                if (error && SMB_UNICODE_STRINGS(vcp)) {
                        /*
                         * If using unicode, leaving a file name as it was when
                         * convert fails will cause a problem because the file name
                         * will contain NULL.
                         * Here, put '?' and give converted file name.
                         */
                        *obuf = '?';
                        olen--;
                        error = 0;
                }
                if (!error) {
                        *nmlen = sizeof(outbuf) - olen;
                        memcpy(name, outbuf, *nmlen);
                }
        }
        return error;
}

void *
smbfs_malloc_scred(void)
{
        return (malloc(sizeof(struct smb_cred), M_SMBFSCRED, M_WAITOK));
}

void
smbfs_free_scred(void *scred)
{
        free(scred, M_SMBFSCRED);
}