sys/emulation/dragonfly12/dfbsd12_getdirentries.c

   1 /*-
   2  * Copyright (c) 2005 The DragonFly Project.  All rights reserved.
   3  *
   4  * This code is derived from software contributed to The DragonFly Project
   5  * by Joerg Sonnenberger <joerg@bec.de>.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  *
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in
  15  *    the documentation and/or other materials provided with the
  16  *    distribution.
  17  * 3. Neither the name of The DragonFly Project nor the names of its
  18  *    contributors may be used to endorse or promote products derived
  19  *    from this software without specific, prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  22  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  23  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
  24  * FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE
  25  * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
  26  * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
  27  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  28  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
  29  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
  30  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
  31  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  32  * SUCH DAMAGE.
  33  *
  34  * $DragonFly: src/sys/emulation/dragonfly12/dfbsd12_getdirentries.c,v 1.3 2006/09/05 00:55:44 dillon Exp $
  35  */
  36
  37 #include "opt_compatdf12.h"
  38
  39 #include <sys/param.h>
  40 #include <sys/dirent.h>
  41 #include <sys/errno.h>
  42 #include <sys/kern_syscall.h>
  43 #include <sys/systm.h>
  44 #include <sys/sysproto.h>
  45 #include <sys/uio.h>
  46
  47 #define PADDED_SIZE(x)  \
  48         ((sizeof(struct dfbsd12_dirent) + (x) + 1 + 3) & ~3)
  49 #define MAX_NAMELEN     255
  50
  51 struct dfbsd12_dirent {
  52         uint32_t        df12_d_fileno;
  53         uint16_t        df12_d_reclen;
  54         uint8_t         df12_d_type;
  55         uint8_t         df12_d_namlen;
  56         char            df12_d_name[];
  57 };
  58
  59 static int
  60 common_getdirentries(long *base, int *result, int fd, char *usr_buf, size_t count)
  61 {
  62         int error, bytes_transfered;
  63         char *buf, *outbuf;
  64         size_t len;
  65         struct dirent *ndp;
  66         struct dfbsd12_dirent *destdp;
  67
  68         if (count > 16384)
  69                 len = 16384;
  70         else
  71                 len = count;
  72
  73         buf = kmalloc(len, M_TEMP, M_WAITOK);
  74
  75         error = kern_getdirentries(fd, buf, len,
  76             base, &bytes_transfered, UIO_SYSSPACE);
  77
  78         if (error) {
  79                 kfree(buf, M_TEMP);
  80                 return(error);
  81         }
  82
  83         ndp = (struct dirent *)buf;
  84         outbuf = usr_buf;
  85         destdp = kmalloc(PADDED_SIZE(MAX_NAMELEN), M_TEMP, M_WAITOK);
  86
  87         for (; (char *)ndp < buf + bytes_transfered; ndp = _DIRENT_NEXT(ndp)) {
  88                 if ((char *)_DIRENT_NEXT(ndp) > buf + bytes_transfered)
  89                         break;
  90                 if (ndp->d_namlen > MAX_NAMELEN)
  91                         continue;
  92                 destdp->df12_d_fileno = ndp->d_ino;
  93                 destdp->df12_d_type = ndp->d_type;
  94                 destdp->df12_d_namlen = ndp->d_namlen;
  95                 destdp->df12_d_reclen = PADDED_SIZE(destdp->df12_d_namlen);
  96                 if (destdp->df12_d_reclen > len)
  97                         break; /* XXX can not happen */
  98                 bcopy(ndp->d_name, destdp->df12_d_name, destdp->df12_d_namlen);
  99                 bzero(destdp->df12_d_name + destdp->df12_d_namlen,
 100                     PADDED_SIZE(destdp->df12_d_namlen) - sizeof(*destdp) -
 101                     destdp->df12_d_namlen);
 102                 error = copyout(destdp, outbuf,
 103                     PADDED_SIZE(destdp->df12_d_namlen));
 104                 if (error)
 105                         break;
 106                 outbuf += PADDED_SIZE(destdp->df12_d_namlen);
 107                 len -= PADDED_SIZE(destdp->df12_d_namlen);
 108         }
 109
 110         kfree(destdp, M_TEMP);
 111         kfree(buf, M_TEMP);
 112         *result = outbuf - usr_buf;
 113         return (0);
 114 }
 115
 116 int
 117 sys_dfbsd12_getdirentries(struct dfbsd12_getdirentries_args *uap)
 118 {
 119         long base;
 120         int error;
 121
 122         error = common_getdirentries(&base, &uap->sysmsg_result, uap->fd,
 123             uap->buf, uap->count);
 124
 125         if (error == 0)
 126                 error = copyout(&base, uap->basep, sizeof(*uap->basep));
 127         return (error);
 128 }
 129
 130 int
 131 sys_dfbsd12_getdents(struct dfbsd12_getdents_args *uap)
 132 {
 133         return(common_getdirentries(NULL, &uap->sysmsg_result, uap->fd,
 134             uap->buf, uap->count));
 135 }