| 1 | /* $NetBSD: vfs_syscalls_12.c,v 1.31 2014/09/05 09:21:54 matt Exp $ */ |
| 2 | |
| 3 | /* |
| 4 | * Copyright (c) 1989, 1993 |
| 5 | * The Regents of the University of California. All rights reserved. |
| 6 | * (c) UNIX System Laboratories, Inc. |
| 7 | * All or some portions of this file are derived from material licensed |
| 8 | * to the University of California by American Telephone and Telegraph |
| 9 | * Co. or Unix System Laboratories, Inc. and are reproduced herein with |
| 10 | * the permission of UNIX System Laboratories, Inc. |
| 11 | * |
| 12 | * Redistribution and use in source and binary forms, with or without |
| 13 | * modification, are permitted provided that the following conditions |
| 14 | * are met: |
| 15 | * 1. Redistributions of source code must retain the above copyright |
| 16 | * notice, this list of conditions and the following disclaimer. |
| 17 | * 2. Redistributions in binary form must reproduce the above copyright |
| 18 | * notice, this list of conditions and the following disclaimer in the |
| 19 | * documentation and/or other materials provided with the distribution. |
| 20 | * 3. Neither the name of the University nor the names of its contributors |
| 21 | * may be used to endorse or promote products derived from this software |
| 22 | * without specific prior written permission. |
| 23 | * |
| 24 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
| 25 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| 26 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| 27 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
| 28 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| 29 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| 30 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| 31 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| 32 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| 33 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| 34 | * SUCH DAMAGE. |
| 35 | * |
| 36 | * From: @(#)vfs_syscalls.c 8.28 (Berkeley) 12/10/94 |
| 37 | */ |
| 38 | |
| 39 | #include <sys/cdefs.h> |
| 40 | __KERNEL_RCSID(0, "$NetBSD: vfs_syscalls_12.c,v 1.31 2014/09/05 09:21:54 matt Exp $" ); |
| 41 | |
| 42 | #include <sys/param.h> |
| 43 | #include <sys/systm.h> |
| 44 | #include <sys/namei.h> |
| 45 | #include <sys/filedesc.h> |
| 46 | #include <sys/kernel.h> |
| 47 | #include <sys/file.h> |
| 48 | #include <sys/stat.h> |
| 49 | #include <sys/socketvar.h> |
| 50 | #include <sys/vnode.h> |
| 51 | #include <sys/proc.h> |
| 52 | #include <sys/uio.h> |
| 53 | #include <sys/dirent.h> |
| 54 | #include <sys/vfs_syscalls.h> |
| 55 | |
| 56 | #include <sys/syscallargs.h> |
| 57 | |
| 58 | #include <compat/sys/stat.h> |
| 59 | #include <compat/sys/dirent.h> |
| 60 | |
| 61 | /* |
| 62 | * Convert from a new to an old stat structure. |
| 63 | */ |
| 64 | void |
| 65 | compat_12_stat_conv(const struct stat *st, struct stat12 *ost) |
| 66 | { |
| 67 | |
| 68 | ost->st_dev = st->st_dev; |
| 69 | ost->st_ino = st->st_ino; |
| 70 | ost->st_mode = st->st_mode & 0xffff; |
| 71 | if (st->st_nlink >= (1 << 15)) |
| 72 | ost->st_nlink = (1 << 15) - 1; |
| 73 | else |
| 74 | ost->st_nlink = st->st_nlink; |
| 75 | ost->st_uid = st->st_uid; |
| 76 | ost->st_gid = st->st_gid; |
| 77 | ost->st_rdev = st->st_rdev; |
| 78 | timespec_to_timespec50(&st->st_atimespec, &ost->st_atimespec); |
| 79 | timespec_to_timespec50(&st->st_mtimespec, &ost->st_mtimespec); |
| 80 | timespec_to_timespec50(&st->st_ctimespec, &ost->st_ctimespec); |
| 81 | ost->st_size = st->st_size; |
| 82 | ost->st_blocks = st->st_blocks; |
| 83 | ost->st_blksize = st->st_blksize; |
| 84 | ost->st_flags = st->st_flags; |
| 85 | ost->st_gen = st->st_gen; |
| 86 | } |
| 87 | |
| 88 | /* |
| 89 | * Read a block of directory entries in a file system independent format. |
| 90 | */ |
| 91 | int |
| 92 | compat_12_sys_getdirentries(struct lwp *l, const struct compat_12_sys_getdirentries_args *uap, register_t *retval) |
| 93 | { |
| 94 | /* { |
| 95 | syscallarg(int) fd; |
| 96 | syscallarg(char *) buf; |
| 97 | syscallarg(u_int) count; |
| 98 | syscallarg(long *) basep; |
| 99 | } */ |
| 100 | struct dirent *bdp; |
| 101 | struct vnode *vp; |
| 102 | char *inp, *tbuf; /* Current-format */ |
| 103 | int len, reclen; /* Current-format */ |
| 104 | char *outp; /* Dirent12-format */ |
| 105 | int resid, old_reclen = 0; /* Dirent12-format */ |
| 106 | struct file *fp; |
| 107 | struct uio auio; |
| 108 | struct iovec aiov; |
| 109 | struct dirent12 idb; |
| 110 | off_t off; /* true file offset */ |
| 111 | int buflen, error, eofflag, nbytes; |
| 112 | struct vattr va; |
| 113 | off_t *cookiebuf = NULL, *cookie; |
| 114 | int ncookies; |
| 115 | long loff; |
| 116 | |
| 117 | /* fd_getvnode() will use the descriptor for us */ |
| 118 | if ((error = fd_getvnode(SCARG(uap, fd), &fp)) != 0) |
| 119 | return (error); |
| 120 | |
| 121 | if ((fp->f_flag & FREAD) == 0) { |
| 122 | error = EBADF; |
| 123 | goto out1; |
| 124 | } |
| 125 | |
| 126 | vp = (struct vnode *)fp->f_vnode; |
| 127 | if (vp->v_type != VDIR) { |
| 128 | error = ENOTDIR; |
| 129 | goto out1; |
| 130 | } |
| 131 | |
| 132 | vn_lock(vp, LK_SHARED | LK_RETRY); |
| 133 | error = VOP_GETATTR(vp, &va, l->l_cred); |
| 134 | VOP_UNLOCK(vp); |
| 135 | if (error) |
| 136 | goto out1; |
| 137 | |
| 138 | loff = fp->f_offset; |
| 139 | nbytes = SCARG(uap, count); |
| 140 | buflen = min(MAXBSIZE, nbytes); |
| 141 | if (buflen < va.va_blocksize) |
| 142 | buflen = va.va_blocksize; |
| 143 | tbuf = malloc(buflen, M_TEMP, M_WAITOK); |
| 144 | |
| 145 | vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); |
| 146 | off = fp->f_offset; |
| 147 | again: |
| 148 | aiov.iov_base = tbuf; |
| 149 | aiov.iov_len = buflen; |
| 150 | auio.uio_iov = &aiov; |
| 151 | auio.uio_iovcnt = 1; |
| 152 | auio.uio_rw = UIO_READ; |
| 153 | auio.uio_resid = buflen; |
| 154 | auio.uio_offset = off; |
| 155 | UIO_SETUP_SYSSPACE(&auio); |
| 156 | /* |
| 157 | * First we read into the malloc'ed buffer, then |
| 158 | * we massage it into user space, one record at a time. |
| 159 | */ |
| 160 | error = VOP_READDIR(vp, &auio, fp->f_cred, &eofflag, &cookiebuf, |
| 161 | &ncookies); |
| 162 | if (error) |
| 163 | goto out; |
| 164 | |
| 165 | inp = tbuf; |
| 166 | outp = SCARG(uap, buf); |
| 167 | resid = nbytes; |
| 168 | if ((len = buflen - auio.uio_resid) == 0) |
| 169 | goto eof; |
| 170 | |
| 171 | for (cookie = cookiebuf; len > 0; len -= reclen) { |
| 172 | bdp = (struct dirent *)inp; |
| 173 | reclen = bdp->d_reclen; |
| 174 | if (reclen & 3) |
| 175 | panic(__func__); |
| 176 | if (bdp->d_fileno == 0) { |
| 177 | inp += reclen; /* it is a hole; squish it out */ |
| 178 | if (cookie) |
| 179 | off = *cookie++; |
| 180 | else |
| 181 | off += reclen; |
| 182 | continue; |
| 183 | } |
| 184 | old_reclen = _DIRENT_RECLEN(&idb, bdp->d_namlen); |
| 185 | if (reclen > len || resid < old_reclen) { |
| 186 | /* entry too big for buffer, so just stop */ |
| 187 | outp++; |
| 188 | break; |
| 189 | } |
| 190 | /* |
| 191 | * Massage in place to make a Dirent12-shaped dirent (otherwise |
| 192 | * we have to worry about touching user memory outside of |
| 193 | * the copyout() call). |
| 194 | */ |
| 195 | idb.d_fileno = (uint32_t)bdp->d_fileno; |
| 196 | idb.d_reclen = (uint16_t)old_reclen; |
| 197 | idb.d_type = (uint8_t)bdp->d_type; |
| 198 | idb.d_namlen = (uint8_t)bdp->d_namlen; |
| 199 | strcpy(idb.d_name, bdp->d_name); |
| 200 | if ((error = copyout(&idb, outp, old_reclen))) |
| 201 | goto out; |
| 202 | /* advance past this real entry */ |
| 203 | inp += reclen; |
| 204 | if (cookie) |
| 205 | off = *cookie++; /* each entry points to itself */ |
| 206 | else |
| 207 | off += reclen; |
| 208 | /* advance output past Dirent12-shaped entry */ |
| 209 | outp += old_reclen; |
| 210 | resid -= old_reclen; |
| 211 | } |
| 212 | |
| 213 | /* if we squished out the whole block, try again */ |
| 214 | if (outp == SCARG(uap, buf)) { |
| 215 | if (cookiebuf) |
| 216 | free(cookiebuf, M_TEMP); |
| 217 | cookiebuf = NULL; |
| 218 | goto again; |
| 219 | } |
| 220 | fp->f_offset = off; /* update the vnode offset */ |
| 221 | |
| 222 | eof: |
| 223 | *retval = nbytes - resid; |
| 224 | out: |
| 225 | VOP_UNLOCK(vp); |
| 226 | if (cookiebuf) |
| 227 | free(cookiebuf, M_TEMP); |
| 228 | free(tbuf, M_TEMP); |
| 229 | out1: |
| 230 | fd_putfile(SCARG(uap, fd)); |
| 231 | if (error) |
| 232 | return error; |
| 233 | return copyout(&loff, SCARG(uap, basep), sizeof(long)); |
| 234 | } |
| 235 | |
| 236 | /* |
| 237 | * Get file status; this version follows links. |
| 238 | */ |
| 239 | /* ARGSUSED */ |
| 240 | int |
| 241 | compat_12_sys_stat(struct lwp *l, const struct compat_12_sys_stat_args *uap, register_t *retval) |
| 242 | { |
| 243 | /* { |
| 244 | syscallarg(const char *) path; |
| 245 | syscallarg(struct stat12 *) ub; |
| 246 | } */ |
| 247 | struct stat sb; |
| 248 | struct stat12 osb; |
| 249 | int error; |
| 250 | |
| 251 | error = do_sys_stat(SCARG(uap, path), FOLLOW, &sb); |
| 252 | if (error) |
| 253 | return (error); |
| 254 | compat_12_stat_conv(&sb, &osb); |
| 255 | error = copyout(&osb, SCARG(uap, ub), sizeof (osb)); |
| 256 | return (error); |
| 257 | } |
| 258 | |
| 259 | |
| 260 | /* |
| 261 | * Get file status; this version does not follow links. |
| 262 | */ |
| 263 | /* ARGSUSED */ |
| 264 | int |
| 265 | compat_12_sys_lstat(struct lwp *l, const struct compat_12_sys_lstat_args *uap, register_t *retval) |
| 266 | { |
| 267 | /* { |
| 268 | syscallarg(const char *) path; |
| 269 | syscallarg(struct stat12 *) ub; |
| 270 | } */ |
| 271 | struct stat sb; |
| 272 | struct stat12 osb; |
| 273 | int error; |
| 274 | |
| 275 | error = do_sys_stat(SCARG(uap, path), NOFOLLOW, &sb); |
| 276 | if (error) |
| 277 | return (error); |
| 278 | compat_12_stat_conv(&sb, &osb); |
| 279 | error = copyout(&osb, SCARG(uap, ub), sizeof (osb)); |
| 280 | return (error); |
| 281 | } |
| 282 | |
| 283 | /* |
| 284 | * Return status information about a file descriptor. |
| 285 | */ |
| 286 | /* ARGSUSED */ |
| 287 | int |
| 288 | compat_12_sys_fstat(struct lwp *l, const struct compat_12_sys_fstat_args *uap, register_t *retval) |
| 289 | { |
| 290 | /* { |
| 291 | syscallarg(int) fd; |
| 292 | syscallarg(struct stat12 *) sb; |
| 293 | } */ |
| 294 | struct stat ub; |
| 295 | struct stat12 oub; |
| 296 | int error; |
| 297 | |
| 298 | error = do_sys_fstat(SCARG(uap, fd), &ub); |
| 299 | if (error == 0) { |
| 300 | compat_12_stat_conv(&ub, &oub); |
| 301 | error = copyout(&oub, SCARG(uap, sb), sizeof (oub)); |
| 302 | } |
| 303 | return (error); |
| 304 | } |
| 305 | |