1 /* $NetBSD: vfs_syscalls_12.c,v 1.33 2017/01/13 22:29:59 christos 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 1.33 2017/01/13 22:29:59 christos 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 memcpy(idb.d_name, bdp->d_name, MIN(sizeof(idb.d_name), 200 bdp->d_namlen)); 201 if ((error = copyout(&idb, outp, old_reclen))) 202 goto out; 203 /* advance past this real entry */ 204 inp += reclen; 205 if (cookie) 206 off = *cookie++; /* each entry points to itself */ 207 else 208 off += reclen; 209 /* advance output past Dirent12-shaped entry */ 210 outp += old_reclen; 211 resid -= old_reclen; 212 } 213 214 /* if we squished out the whole block, try again */ 215 if (outp == SCARG(uap, buf)) { 216 if (cookiebuf) 217 free(cookiebuf, M_TEMP); 218 cookiebuf = NULL; 219 goto again; 220 } 221 fp->f_offset = off; /* update the vnode offset */ 222 223 eof: 224 *retval = nbytes - resid; 225 out: 226 VOP_UNLOCK(vp); 227 if (cookiebuf) 228 free(cookiebuf, M_TEMP); 229 free(tbuf, M_TEMP); 230 out1: 231 fd_putfile(SCARG(uap, fd)); 232 if (error) 233 return error; 234 return copyout(&loff, SCARG(uap, basep), sizeof(long)); 235 } 236 237 /* 238 * Get file status; this version follows links. 239 */ 240 /* ARGSUSED */ 241 int 242 compat_12_sys_stat(struct lwp *l, const struct compat_12_sys_stat_args *uap, register_t *retval) 243 { 244 /* { 245 syscallarg(const char *) path; 246 syscallarg(struct stat12 *) ub; 247 } */ 248 struct stat sb; 249 struct stat12 osb; 250 int error; 251 252 error = do_sys_stat(SCARG(uap, path), FOLLOW, &sb); 253 if (error) 254 return (error); 255 compat_12_stat_conv(&sb, &osb); 256 error = copyout(&osb, SCARG(uap, ub), sizeof (osb)); 257 return (error); 258 } 259 260 261 /* 262 * Get file status; this version does not follow links. 263 */ 264 /* ARGSUSED */ 265 int 266 compat_12_sys_lstat(struct lwp *l, const struct compat_12_sys_lstat_args *uap, register_t *retval) 267 { 268 /* { 269 syscallarg(const char *) path; 270 syscallarg(struct stat12 *) ub; 271 } */ 272 struct stat sb; 273 struct stat12 osb; 274 int error; 275 276 error = do_sys_stat(SCARG(uap, path), NOFOLLOW, &sb); 277 if (error) 278 return (error); 279 compat_12_stat_conv(&sb, &osb); 280 error = copyout(&osb, SCARG(uap, ub), sizeof (osb)); 281 return (error); 282 } 283 284 /* 285 * Return status information about a file descriptor. 286 */ 287 /* ARGSUSED */ 288 int 289 compat_12_sys_fstat(struct lwp *l, const struct compat_12_sys_fstat_args *uap, register_t *retval) 290 { 291 /* { 292 syscallarg(int) fd; 293 syscallarg(struct stat12 *) sb; 294 } */ 295 struct stat ub; 296 struct stat12 oub; 297 int error; 298 299 error = do_sys_fstat(SCARG(uap, fd), &ub); 300 if (error == 0) { 301 compat_12_stat_conv(&ub, &oub); 302 error = copyout(&oub, SCARG(uap, sb), sizeof (oub)); 303 } 304 return (error); 305 } 306