/*      $NetBSD: rump_sunos_compat.c,v 1.4 2019/01/27 02:08:49 pgoyette Exp $   */

/*
 * Copyright (c) 2013 Antti Kantee.  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 ``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/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: rump_sunos_compat.c,v 1.4 2019/01/27 02:08:49 pgoyette Exp $");

#include <sys/param.h>
#include <sys/dirent.h>
#include <sys/fcntl.h>
#include <sys/file.h>
#include <sys/filedesc.h>
#include <sys/malloc.h>
#include <sys/namei.h>
#include <sys/stat.h>
#include <sys/syscallargs.h>
#include <sys/vnode.h>
#include <sys/vfs_syscalls.h>

#include <compat/sys/time_types.h>

#include "rump_sunos_syscallargs.h"

#define SUNOS_MAXNAMLEN 255

struct sunos_dirent {
        uint64_t        d_fileno;
        int64_t         d_off;
        unsigned short  d_reclen;
        char            d_name[SUNOS_MAXNAMLEN + 1];
};

#define SUNOS_NAMEOFF(dp)       ((char *)&(dp)->d_name - (char *)dp)
#define SUNOS_RECLEN(de,namlen) ALIGN((SUNOS_NAMEOFF(de) + (namlen) + 1))

/*
 * Rump kernels always use the _FILE_OFFSET_BITS=64 API.
 */
#ifdef __LP64__
struct sunos_stat {
        unsigned long   st_dev;
        uint64_t        st_ino;
        unsigned int    st_mode;
        unsigned int    st_nlink;
        unsigned int    st_uid;
        unsigned int    st_gid;
        unsigned long   st_rdev;
        off_t           st_size;

        struct timespec st_atim;
        struct timespec st_mtim;
        struct timespec st_ctim;
        int             st_blksize;
        uint64_t        st_blocks;
        char            st_fstype[16];
};
#else
struct sunos_stat {
        unsigned long   st_dev;
        long            st_pad1[3];
        uint64_t        st_ino;
        unsigned int    st_mode;
        unsigned int    st_nlink;
        unsigned int    st_uid;
        unsigned int    st_gid;
        unsigned long   st_rdev;
        long            st_pad2[2];
        off_t           st_size;

        struct timespec50 st_atim;
        struct timespec50 st_mtim;
        struct timespec50 st_ctim;

        int             st_blksize;
        uint64_t        st_blocks;
        char            st_fstype[16];
        long            st_pad4[8];
};
#endif

#define PARCOPY(a) ssb->a = sb->a
static void
bsd_to_sunos_stat(const struct stat *sb, struct sunos_stat *ssb)
{

        memset(ssb, 0, sizeof(*ssb));
        PARCOPY(st_dev);
        PARCOPY(st_ino);
        PARCOPY(st_mode);
        PARCOPY(st_nlink);
        PARCOPY(st_uid);
        PARCOPY(st_gid);
        PARCOPY(st_rdev);
        PARCOPY(st_size);
        PARCOPY(st_blksize);
        PARCOPY(st_blocks);

#ifdef __LP64__
        ssb->st_atim = sb->st_atimespec;
        ssb->st_mtim = sb->st_mtimespec;
        ssb->st_ctim = sb->st_ctimespec;
#else
        timespec_to_timespec50(&sb->st_atimespec, &ssb->st_atim);
        timespec_to_timespec50(&sb->st_mtimespec, &ssb->st_mtim);
        timespec_to_timespec50(&sb->st_ctimespec, &ssb->st_ctim);
#endif
}

int
rump_sunos_sys_stat(struct lwp *l, const struct rump_sunos_sys_stat_args *uap,
        register_t *retval)
{
        struct sunos_stat ssb;
        struct stat sb;
        int error;

        error = do_sys_stat(SCARG(uap, path), FOLLOW, &sb);
        if (error)
                return error;

        bsd_to_sunos_stat(&sb, &ssb);

        return copyout(&ssb, SCARG(uap, sp), sizeof(ssb));
}

int
rump_sunos_sys_fstat(struct lwp *l, const struct rump_sunos_sys_fstat_args *uap,
        register_t *retval)
{
        struct sunos_stat ssb;
        struct stat sb;
        int error;

        error = do_sys_fstat(SCARG(uap, fd), &sb);
        if (error)
                return error;

        bsd_to_sunos_stat(&sb, &ssb);

        return copyout(&ssb, SCARG(uap, sp), sizeof(ssb));
}

int
rump_sunos_sys_lstat(struct lwp *l, const struct rump_sunos_sys_lstat_args *uap,
        register_t *retval)
{
        struct sunos_stat ssb;
        struct stat sb;
        int error;

        error = do_sys_stat(SCARG(uap, path), NOFOLLOW, &sb);
        if (error)
                return error;

        bsd_to_sunos_stat(&sb, &ssb);

        return copyout(&ssb, SCARG(uap, sp), sizeof(ssb));
}

int
rump_sunos_sys_open(struct lwp *l, const struct rump_sunos_sys_open_args *uap,
        register_t *retval)
{
        /* {
                syscallarg(const char *) path;
                syscallarg(int) flags;
                syscallarg(int) mode;
        } */
        struct sys_open_args ua;
        int sflags, flags;

        sflags = SCARG(uap, flags);
        flags =  (sflags & (0x8 | 0x4 | 0x3)); /* nonblock/append/rw */
        flags |= (sflags & 0x10)        ? O_SYNC : 0;
        flags |= (sflags & 0x40)        ? O_DSYNC : 0;
        flags |= (sflags & 0x8000)      ? O_RSYNC : 0;
        flags |= (sflags & 0x80)        ? O_NONBLOCK : 0;
        flags |= (sflags & 0x100)       ? O_CREAT : 0;
        flags |= (sflags & 0x200)       ? O_TRUNC : 0;
        flags |= (sflags & 0x400)       ? O_EXCL : 0;
        flags |= (sflags & 0x20000)     ? O_NOFOLLOW : 0;
        
        SCARG(&ua, path) = SCARG(uap, path);
        SCARG(&ua, flags) = flags;
        SCARG(&ua, mode) = SCARG(uap, mode);

        return sys_open(l, &ua, retval);
}

/*-
 * Copyright (c) 1992, 1993
 *      The Regents of the University of California.  All rights reserved.
 *
 * This software was developed by the Computer Systems Engineering group
 * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
 * contributed to Berkeley.
 *
 * All advertising materials mentioning features or use of this software
 * must display the following acknowledgement:
 *      This product includes software developed by the University of
 *      California, Lawrence Berkeley Laboratory.
 *
 * 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.
 *
 *      @(#)sunos_misc.c        8.1 (Berkeley) 6/18/93
 *
 *      Header: sunos_misc.c,v 1.16 93/04/07 02:46:27 torek Exp
 */

int
rump_sunos_sys_getdents(struct lwp *l,
        const struct rump_sunos_sys_getdents_args *uap, register_t *retval)
{
        struct dirent *bdp;
        struct vnode *vp;
        char *inp, *buf;        /* BSD-format */
        int len, reclen;        /* BSD-format */
        char *outp;             /* Sun-format */
        int resid, sunos_reclen;/* Sun-format */
        struct file *fp;
        struct uio auio;
        struct iovec aiov;
        struct sunos_dirent idb;
        off_t off;                      /* true file offset */
        int buflen, error, eofflag;
        off_t *cookiebuf, *cookie;
        int ncookies;

        if ((error = fd_getvnode(SCARG(uap, fd), &fp)) != 0)
                return (error);

        if ((fp->f_flag & FREAD) == 0) {
                error = EBADF;
                goto out1;
        }

        vp = fp->f_data;
        if (vp->v_type != VDIR) {
                error = EINVAL;
                goto out1;
        }

        buflen = min(MAXBSIZE, SCARG(uap, nbytes));
        buf = malloc(buflen, M_TEMP, M_WAITOK);
        vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
        off = fp->f_offset;
again:
        aiov.iov_base = buf;
        aiov.iov_len = buflen;
        auio.uio_iov = &aiov;
        auio.uio_iovcnt = 1;
        auio.uio_rw = UIO_READ;
        auio.uio_resid = buflen;
        auio.uio_offset = off;
        UIO_SETUP_SYSSPACE(&auio);
        /*
         * First we read into the malloc'ed buffer, then
         * we massage it into user space, one record at a time.
         */
        error = VOP_READDIR(vp, &auio, fp->f_cred, &eofflag, &cookiebuf,
            &ncookies);
        if (error)
                goto out;

        inp = buf;
        outp = SCARG(uap, buf);
        resid = SCARG(uap, nbytes);
        if ((len = buflen - auio.uio_resid) == 0)
                goto eof;

        for (cookie = cookiebuf; len > 0; len -= reclen) {
                bdp = (struct dirent *)inp;
                reclen = bdp->d_reclen;
                if (reclen & 3) {
                        error = EIO;
                        goto out;
                }
                if ((*cookie >> 32) != 0) {
                        printf("rump_sunos_sys_getdents: offset too large\n");
                        error = EINVAL;
                        goto out;
                }
                if (bdp->d_fileno == 0) {
                        inp += reclen;  /* it is a hole; squish it out */
                        if (cookie)
                                off = *cookie++;
                        else
                                off += reclen;
                        continue;
                }
                sunos_reclen = SUNOS_RECLEN(&idb, bdp->d_namlen);
                if (reclen > len || resid < sunos_reclen) {
                        /* entry too big for buffer, so just stop */
                        outp++;
                        break;
                }
                if (cookie)
                        off = *cookie++;        /* each entry points to next */
                else
                        off += reclen;
                /*
                 * Massage in place to make a Sun-shaped dirent (otherwise
                 * we have to worry about touching user memory outside of
                 * the copyout() call).
                 */
                idb.d_fileno = bdp->d_fileno;
                idb.d_off = off;
                idb.d_reclen = sunos_reclen;
                strlcpy(idb.d_name, bdp->d_name, sizeof(idb.d_name));
                if ((error = copyout((void *)&idb, outp, sunos_reclen)) != 0)
                        goto out;
                /* advance past this real entry */
                inp += reclen;
                /* advance output past Sun-shaped entry */
                outp += sunos_reclen;
                resid -= sunos_reclen;
        }

        /* if we squished out the whole block, try again */
        if (outp == SCARG(uap, buf)) {
                if (cookiebuf)
                        free(cookiebuf, M_TEMP);
                cookiebuf = NULL;
                goto again;
        }
        fp->f_offset = off;             /* update the vnode offset */

eof:
        *retval = SCARG(uap, nbytes) - resid;
out:
        VOP_UNLOCK(vp);
        free(cookiebuf, M_TEMP);
        free(buf, M_TEMP);
 out1:
        fd_putfile(SCARG(uap, fd));
        return (error);
}