ptyfs_vnops.c revision 1.32
1 /* $NetBSD: ptyfs_vnops.c,v 1.32 2009/07/03 21:17:40 elad Exp $ */ 2 3 /* 4 * Copyright (c) 1993, 1995 5 * The Regents of the University of California. All rights reserved. 6 * 7 * This code is derived from software contributed to Berkeley by 8 * Jan-Simon Pendry. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. Neither the name of the University nor the names of its contributors 19 * may be used to endorse or promote products derived from this software 20 * without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 * 34 * @(#)procfs_vnops.c 8.18 (Berkeley) 5/21/95 35 */ 36 37 /* 38 * Copyright (c) 1993 Jan-Simon Pendry 39 * 40 * This code is derived from software contributed to Berkeley by 41 * Jan-Simon Pendry. 42 * 43 * Redistribution and use in source and binary forms, with or without 44 * modification, are permitted provided that the following conditions 45 * are met: 46 * 1. Redistributions of source code must retain the above copyright 47 * notice, this list of conditions and the following disclaimer. 48 * 2. Redistributions in binary form must reproduce the above copyright 49 * notice, this list of conditions and the following disclaimer in the 50 * documentation and/or other materials provided with the distribution. 51 * 3. All advertising materials mentioning features or use of this software 52 * must display the following acknowledgement: 53 * This product includes software developed by the University of 54 * California, Berkeley and its contributors. 55 * 4. Neither the name of the University nor the names of its contributors 56 * may be used to endorse or promote products derived from this software 57 * without specific prior written permission. 58 * 59 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 60 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 61 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 62 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 63 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 64 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 65 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 66 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 67 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 68 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 69 * SUCH DAMAGE. 70 * 71 * @(#)procfs_vnops.c 8.18 (Berkeley) 5/21/95 72 */ 73 74 /* 75 * ptyfs vnode interface 76 */ 77 78 #include <sys/cdefs.h> 79 __KERNEL_RCSID(0, "$NetBSD: ptyfs_vnops.c,v 1.32 2009/07/03 21:17:40 elad Exp $"); 80 81 #include <sys/param.h> 82 #include <sys/systm.h> 83 #include <sys/time.h> 84 #include <sys/kernel.h> 85 #include <sys/file.h> 86 #include <sys/filedesc.h> 87 #include <sys/proc.h> 88 #include <sys/vnode.h> 89 #include <sys/namei.h> 90 #include <sys/malloc.h> 91 #include <sys/mount.h> 92 #include <sys/select.h> 93 #include <sys/dirent.h> 94 #include <sys/resourcevar.h> 95 #include <sys/stat.h> 96 #include <sys/conf.h> 97 #include <sys/tty.h> 98 #include <sys/pty.h> 99 #include <sys/kauth.h> 100 101 #include <uvm/uvm_extern.h> /* for PAGE_SIZE */ 102 103 #include <machine/reg.h> 104 105 #include <fs/ptyfs/ptyfs.h> 106 #include <miscfs/genfs/genfs.h> 107 #include <miscfs/specfs/specdev.h> 108 109 MALLOC_DECLARE(M_PTYFSTMP); 110 111 /* 112 * Vnode Operations. 113 * 114 */ 115 116 int ptyfs_lookup (void *); 117 #define ptyfs_create genfs_eopnotsupp 118 #define ptyfs_mknod genfs_eopnotsupp 119 int ptyfs_open (void *); 120 int ptyfs_close (void *); 121 int ptyfs_access (void *); 122 int ptyfs_getattr (void *); 123 int ptyfs_setattr (void *); 124 int ptyfs_read (void *); 125 int ptyfs_write (void *); 126 #define ptyfs_fcntl genfs_fcntl 127 int ptyfs_ioctl (void *); 128 int ptyfs_poll (void *); 129 int ptyfs_kqfilter (void *); 130 #define ptyfs_revoke genfs_revoke 131 #define ptyfs_mmap genfs_eopnotsupp 132 #define ptyfs_fsync genfs_nullop 133 #define ptyfs_seek genfs_nullop 134 #define ptyfs_remove genfs_eopnotsupp 135 #define ptyfs_link genfs_abortop 136 #define ptyfs_rename genfs_eopnotsupp 137 #define ptyfs_mkdir genfs_eopnotsupp 138 #define ptyfs_rmdir genfs_eopnotsupp 139 #define ptyfs_symlink genfs_abortop 140 int ptyfs_readdir (void *); 141 #define ptyfs_readlink genfs_eopnotsupp 142 #define ptyfs_abortop genfs_abortop 143 int ptyfs_reclaim (void *); 144 #define ptyfs_lock genfs_lock 145 #define ptyfs_unlock genfs_unlock 146 #define ptyfs_bmap genfs_badop 147 #define ptyfs_strategy genfs_badop 148 int ptyfs_print (void *); 149 int ptyfs_pathconf (void *); 150 #define ptyfs_islocked genfs_islocked 151 #define ptyfs_advlock genfs_einval 152 #define ptyfs_bwrite genfs_eopnotsupp 153 #define ptyfs_putpages genfs_null_putpages 154 155 static int ptyfs_update(struct vnode *, const struct timespec *, 156 const struct timespec *, int); 157 static int ptyfs_chown(struct vnode *, uid_t, gid_t, kauth_cred_t, 158 struct lwp *); 159 static int ptyfs_chmod(struct vnode *, mode_t, kauth_cred_t, struct lwp *); 160 static int atoi(const char *, size_t); 161 162 /* 163 * ptyfs vnode operations. 164 */ 165 int (**ptyfs_vnodeop_p)(void *); 166 const struct vnodeopv_entry_desc ptyfs_vnodeop_entries[] = { 167 { &vop_default_desc, vn_default_error }, 168 { &vop_lookup_desc, ptyfs_lookup }, /* lookup */ 169 { &vop_create_desc, ptyfs_create }, /* create */ 170 { &vop_mknod_desc, ptyfs_mknod }, /* mknod */ 171 { &vop_open_desc, ptyfs_open }, /* open */ 172 { &vop_close_desc, ptyfs_close }, /* close */ 173 { &vop_access_desc, ptyfs_access }, /* access */ 174 { &vop_getattr_desc, ptyfs_getattr }, /* getattr */ 175 { &vop_setattr_desc, ptyfs_setattr }, /* setattr */ 176 { &vop_read_desc, ptyfs_read }, /* read */ 177 { &vop_write_desc, ptyfs_write }, /* write */ 178 { &vop_ioctl_desc, ptyfs_ioctl }, /* ioctl */ 179 { &vop_fcntl_desc, ptyfs_fcntl }, /* fcntl */ 180 { &vop_poll_desc, ptyfs_poll }, /* poll */ 181 { &vop_kqfilter_desc, ptyfs_kqfilter }, /* kqfilter */ 182 { &vop_revoke_desc, ptyfs_revoke }, /* revoke */ 183 { &vop_mmap_desc, ptyfs_mmap }, /* mmap */ 184 { &vop_fsync_desc, ptyfs_fsync }, /* fsync */ 185 { &vop_seek_desc, ptyfs_seek }, /* seek */ 186 { &vop_remove_desc, ptyfs_remove }, /* remove */ 187 { &vop_link_desc, ptyfs_link }, /* link */ 188 { &vop_rename_desc, ptyfs_rename }, /* rename */ 189 { &vop_mkdir_desc, ptyfs_mkdir }, /* mkdir */ 190 { &vop_rmdir_desc, ptyfs_rmdir }, /* rmdir */ 191 { &vop_symlink_desc, ptyfs_symlink }, /* symlink */ 192 { &vop_readdir_desc, ptyfs_readdir }, /* readdir */ 193 { &vop_readlink_desc, ptyfs_readlink }, /* readlink */ 194 { &vop_abortop_desc, ptyfs_abortop }, /* abortop */ 195 { &vop_inactive_desc, spec_inactive }, /* inactive */ 196 { &vop_reclaim_desc, ptyfs_reclaim }, /* reclaim */ 197 { &vop_lock_desc, ptyfs_lock }, /* lock */ 198 { &vop_unlock_desc, ptyfs_unlock }, /* unlock */ 199 { &vop_bmap_desc, ptyfs_bmap }, /* bmap */ 200 { &vop_strategy_desc, ptyfs_strategy }, /* strategy */ 201 { &vop_print_desc, ptyfs_print }, /* print */ 202 { &vop_islocked_desc, ptyfs_islocked }, /* islocked */ 203 { &vop_pathconf_desc, ptyfs_pathconf }, /* pathconf */ 204 { &vop_advlock_desc, ptyfs_advlock }, /* advlock */ 205 { &vop_bwrite_desc, ptyfs_bwrite }, /* bwrite */ 206 { &vop_putpages_desc, ptyfs_putpages }, /* putpages */ 207 { NULL, NULL } 208 }; 209 const struct vnodeopv_desc ptyfs_vnodeop_opv_desc = 210 { &ptyfs_vnodeop_p, ptyfs_vnodeop_entries }; 211 212 /* 213 * _reclaim is called when getnewvnode() 214 * wants to make use of an entry on the vnode 215 * free list. at this time the filesystem needs 216 * to free any private data and remove the node 217 * from any private lists. 218 */ 219 int 220 ptyfs_reclaim(void *v) 221 { 222 struct vop_reclaim_args /* { 223 struct vnode *a_vp; 224 } */ *ap = v; 225 return ptyfs_freevp(ap->a_vp); 226 } 227 228 /* 229 * Return POSIX pathconf information applicable to special devices. 230 */ 231 int 232 ptyfs_pathconf(void *v) 233 { 234 struct vop_pathconf_args /* { 235 struct vnode *a_vp; 236 int a_name; 237 register_t *a_retval; 238 } */ *ap = v; 239 240 switch (ap->a_name) { 241 case _PC_LINK_MAX: 242 *ap->a_retval = LINK_MAX; 243 return 0; 244 case _PC_MAX_CANON: 245 *ap->a_retval = MAX_CANON; 246 return 0; 247 case _PC_MAX_INPUT: 248 *ap->a_retval = MAX_INPUT; 249 return 0; 250 case _PC_PIPE_BUF: 251 *ap->a_retval = PIPE_BUF; 252 return 0; 253 case _PC_CHOWN_RESTRICTED: 254 *ap->a_retval = 1; 255 return 0; 256 case _PC_VDISABLE: 257 *ap->a_retval = _POSIX_VDISABLE; 258 return 0; 259 case _PC_SYNC_IO: 260 *ap->a_retval = 1; 261 return 0; 262 default: 263 return EINVAL; 264 } 265 } 266 267 /* 268 * _print is used for debugging. 269 * just print a readable description 270 * of (vp). 271 */ 272 int 273 ptyfs_print(void *v) 274 { 275 struct vop_print_args /* { 276 struct vnode *a_vp; 277 } */ *ap = v; 278 struct ptyfsnode *ptyfs = VTOPTYFS(ap->a_vp); 279 280 printf("tag VT_PTYFS, type %d, pty %d\n", 281 ptyfs->ptyfs_type, ptyfs->ptyfs_pty); 282 return 0; 283 } 284 285 /* 286 * Invent attributes for ptyfsnode (vp) and store 287 * them in (vap). 288 * Directories lengths are returned as zero since 289 * any real length would require the genuine size 290 * to be computed, and nothing cares anyway. 291 * 292 * this is relatively minimal for ptyfs. 293 */ 294 int 295 ptyfs_getattr(void *v) 296 { 297 struct vop_getattr_args /* { 298 struct vnode *a_vp; 299 struct vattr *a_vap; 300 kauth_cred_t a_cred; 301 } */ *ap = v; 302 struct ptyfsnode *ptyfs = VTOPTYFS(ap->a_vp); 303 struct vattr *vap = ap->a_vap; 304 305 PTYFS_ITIMES(ptyfs, NULL, NULL, NULL); 306 307 /* start by zeroing out the attributes */ 308 VATTR_NULL(vap); 309 310 /* next do all the common fields */ 311 vap->va_type = ap->a_vp->v_type; 312 vap->va_fsid = ap->a_vp->v_mount->mnt_stat.f_fsidx.__fsid_val[0]; 313 vap->va_fileid = ptyfs->ptyfs_fileno; 314 vap->va_gen = 0; 315 vap->va_flags = 0; 316 vap->va_nlink = 1; 317 vap->va_blocksize = PAGE_SIZE; 318 319 vap->va_atime = ptyfs->ptyfs_atime; 320 vap->va_mtime = ptyfs->ptyfs_mtime; 321 vap->va_ctime = ptyfs->ptyfs_ctime; 322 vap->va_birthtime = ptyfs->ptyfs_birthtime; 323 vap->va_mode = ptyfs->ptyfs_mode; 324 vap->va_flags = ptyfs->ptyfs_flags; 325 vap->va_uid = ptyfs->ptyfs_uid; 326 vap->va_gid = ptyfs->ptyfs_gid; 327 328 switch (ptyfs->ptyfs_type) { 329 case PTYFSpts: 330 case PTYFSptc: 331 if (pty_isfree(ptyfs->ptyfs_pty, 1)) 332 return ENOENT; 333 vap->va_bytes = vap->va_size = 0; 334 vap->va_rdev = ap->a_vp->v_rdev; 335 break; 336 case PTYFSroot: 337 vap->va_rdev = 0; 338 vap->va_bytes = vap->va_size = DEV_BSIZE; 339 break; 340 341 default: 342 return EOPNOTSUPP; 343 } 344 345 return 0; 346 } 347 348 /*ARGSUSED*/ 349 int 350 ptyfs_setattr(void *v) 351 { 352 struct vop_setattr_args /* { 353 struct vnodeop_desc *a_desc; 354 struct vnode *a_vp; 355 struct vattr *a_vap; 356 kauth_cred_t a_cred; 357 } */ *ap = v; 358 struct vnode *vp = ap->a_vp; 359 struct ptyfsnode *ptyfs = VTOPTYFS(vp); 360 struct vattr *vap = ap->a_vap; 361 kauth_cred_t cred = ap->a_cred; 362 struct lwp *l = curlwp; 363 int error; 364 365 if (vap->va_size != VNOVAL) { 366 switch (ptyfs->ptyfs_type) { 367 case PTYFSroot: 368 return EISDIR; 369 case PTYFSpts: 370 case PTYFSptc: 371 break; 372 default: 373 return EINVAL; 374 } 375 } 376 377 if (vap->va_flags != VNOVAL) { 378 if (vp->v_mount->mnt_flag & MNT_RDONLY) 379 return EROFS; 380 if (kauth_cred_geteuid(cred) != ptyfs->ptyfs_uid && 381 (error = kauth_authorize_generic(cred, KAUTH_GENERIC_ISSUSER, 382 NULL)) != 0) 383 return error; 384 /* Immutable and append-only flags are not supported on ptyfs. */ 385 if (vap->va_flags & (IMMUTABLE | APPEND)) 386 return EINVAL; 387 if (kauth_authorize_generic(cred, KAUTH_GENERIC_ISSUSER, NULL) == 0) { 388 /* Snapshot flag cannot be set or cleared */ 389 if ((vap->va_flags & SF_SNAPSHOT) != 390 (ptyfs->ptyfs_flags & SF_SNAPSHOT)) 391 return EPERM; 392 ptyfs->ptyfs_flags = vap->va_flags; 393 } else { 394 if ((ptyfs->ptyfs_flags & SF_SETTABLE) != 395 (vap->va_flags & SF_SETTABLE)) 396 return EPERM; 397 ptyfs->ptyfs_flags &= SF_SETTABLE; 398 ptyfs->ptyfs_flags |= (vap->va_flags & UF_SETTABLE); 399 } 400 ptyfs->ptyfs_flag |= PTYFS_CHANGE; 401 } 402 403 /* 404 * Go through the fields and update iff not VNOVAL. 405 */ 406 if (vap->va_uid != (uid_t)VNOVAL || vap->va_gid != (gid_t)VNOVAL) { 407 if (vp->v_mount->mnt_flag & MNT_RDONLY) 408 return EROFS; 409 if (ptyfs->ptyfs_type == PTYFSroot) 410 return EPERM; 411 error = ptyfs_chown(vp, vap->va_uid, vap->va_gid, cred, l); 412 if (error) 413 return error; 414 } 415 416 if (vap->va_atime.tv_sec != VNOVAL || vap->va_mtime.tv_sec != VNOVAL || 417 vap->va_birthtime.tv_sec != VNOVAL) { 418 if (vp->v_mount->mnt_flag & MNT_RDONLY) 419 return EROFS; 420 if ((ptyfs->ptyfs_flags & SF_SNAPSHOT) != 0) 421 return EPERM; 422 error = genfs_can_chtimes(vp, vap->va_vaflags, ptyfs->ptyfs_uid, 423 cred); 424 if (error) 425 return (error); 426 if (vap->va_atime.tv_sec != VNOVAL) 427 if (!(vp->v_mount->mnt_flag & MNT_NOATIME)) 428 ptyfs->ptyfs_flag |= PTYFS_ACCESS; 429 if (vap->va_mtime.tv_sec != VNOVAL) 430 ptyfs->ptyfs_flag |= PTYFS_CHANGE | PTYFS_MODIFY; 431 if (vap->va_birthtime.tv_sec != VNOVAL) 432 ptyfs->ptyfs_birthtime = vap->va_birthtime; 433 ptyfs->ptyfs_flag |= PTYFS_CHANGE; 434 error = ptyfs_update(vp, &vap->va_atime, &vap->va_mtime, 0); 435 if (error) 436 return error; 437 } 438 if (vap->va_mode != (mode_t)VNOVAL) { 439 if (vp->v_mount->mnt_flag & MNT_RDONLY) 440 return EROFS; 441 if (ptyfs->ptyfs_type == PTYFSroot) 442 return EPERM; 443 if ((ptyfs->ptyfs_flags & SF_SNAPSHOT) != 0 && 444 (vap->va_mode & 445 (S_IXUSR|S_IWUSR|S_IXGRP|S_IWGRP|S_IXOTH|S_IWOTH))) 446 return EPERM; 447 error = ptyfs_chmod(vp, vap->va_mode, cred, l); 448 if (error) 449 return error; 450 } 451 VN_KNOTE(vp, NOTE_ATTRIB); 452 return 0; 453 } 454 455 /* 456 * Change the mode on a file. 457 * Inode must be locked before calling. 458 */ 459 static int 460 ptyfs_chmod(struct vnode *vp, mode_t mode, kauth_cred_t cred, struct lwp *l) 461 { 462 struct ptyfsnode *ptyfs = VTOPTYFS(vp); 463 int error; 464 465 error = genfs_can_chmod(vp, cred, ptyfs->ptyfs_uid, 466 ptyfs->ptyfs_gid, mode); 467 if (error) 468 return (error); 469 470 ptyfs->ptyfs_mode &= ~ALLPERMS; 471 ptyfs->ptyfs_mode |= (mode & ALLPERMS); 472 return 0; 473 } 474 475 /* 476 * Perform chown operation on inode ip; 477 * inode must be locked prior to call. 478 */ 479 static int 480 ptyfs_chown(struct vnode *vp, uid_t uid, gid_t gid, kauth_cred_t cred, 481 struct lwp *l) 482 { 483 struct ptyfsnode *ptyfs = VTOPTYFS(vp); 484 int error; 485 486 if (uid == (uid_t)VNOVAL) 487 uid = ptyfs->ptyfs_uid; 488 if (gid == (gid_t)VNOVAL) 489 gid = ptyfs->ptyfs_gid; 490 491 error = genfs_can_chown(vp, cred, ptyfs->ptyfs_uid, 492 ptyfs->ptyfs_gid, uid, gid); 493 if (error) 494 return (error); 495 496 ptyfs->ptyfs_gid = gid; 497 ptyfs->ptyfs_uid = uid; 498 return 0; 499 } 500 501 static int 502 ptyfs_check_possible(struct vnode *vp, mode_t mode) 503 { 504 505 return 0; 506 } 507 508 static int 509 ptyfs_check_permitted(struct vattr *va, mode_t mode, kauth_cred_t cred) 510 { 511 512 return genfs_can_access(va->va_type, va->va_mode, 513 va->va_uid, va->va_gid, mode, cred); 514 } 515 516 /* 517 * implement access checking. 518 * 519 * actually, the check for super-user is slightly 520 * broken since it will allow read access to write-only 521 * objects. this doesn't cause any particular trouble 522 * but does mean that the i/o entry points need to check 523 * that the operation really does make sense. 524 */ 525 int 526 ptyfs_access(void *v) 527 { 528 struct vop_access_args /* { 529 struct vnode *a_vp; 530 int a_mode; 531 kauth_cred_t a_cred; 532 } */ *ap = v; 533 struct vattr va; 534 int error; 535 536 if ((error = VOP_GETATTR(ap->a_vp, &va, ap->a_cred)) != 0) 537 return error; 538 539 error = ptyfs_check_possible(ap->a_vp, ap->a_mode); 540 if (error) 541 return error; 542 543 error = ptyfs_check_permitted(&va, ap->a_mode, ap->a_cred); 544 545 return error; 546 } 547 548 /* 549 * lookup. this is incredibly complicated in the 550 * general case, however for most pseudo-filesystems 551 * very little needs to be done. 552 * 553 * Locking isn't hard here, just poorly documented. 554 * 555 * If we're looking up ".", just vref the parent & return it. 556 * 557 * If we're looking up "..", unlock the parent, and lock "..". If everything 558 * went ok, try to re-lock the parent. We do this to prevent lock races. 559 * 560 * For anything else, get the needed node. 561 * 562 * We try to exit with the parent locked in error cases. 563 */ 564 int 565 ptyfs_lookup(void *v) 566 { 567 struct vop_lookup_args /* { 568 struct vnode * a_dvp; 569 struct vnode ** a_vpp; 570 struct componentname * a_cnp; 571 } */ *ap = v; 572 struct componentname *cnp = ap->a_cnp; 573 struct vnode **vpp = ap->a_vpp; 574 struct vnode *dvp = ap->a_dvp; 575 const char *pname = cnp->cn_nameptr; 576 struct ptyfsnode *ptyfs; 577 int pty, error; 578 579 *vpp = NULL; 580 581 if (cnp->cn_nameiop == DELETE || cnp->cn_nameiop == RENAME) 582 return EROFS; 583 584 if (cnp->cn_namelen == 1 && *pname == '.') { 585 *vpp = dvp; 586 VREF(dvp); 587 return 0; 588 } 589 590 ptyfs = VTOPTYFS(dvp); 591 switch (ptyfs->ptyfs_type) { 592 case PTYFSroot: 593 /* 594 * Shouldn't get here with .. in the root node. 595 */ 596 if (cnp->cn_flags & ISDOTDOT) 597 return EIO; 598 599 pty = atoi(pname, cnp->cn_namelen); 600 601 if (pty < 0 || pty >= npty || pty_isfree(pty, 1)) 602 break; 603 604 error = ptyfs_allocvp(dvp->v_mount, vpp, PTYFSpts, pty, 605 curlwp); 606 return error; 607 608 default: 609 return ENOTDIR; 610 } 611 612 return cnp->cn_nameiop == LOOKUP ? ENOENT : EROFS; 613 } 614 615 /* 616 * readdir returns directory entries from ptyfsnode (vp). 617 * 618 * the strategy here with ptyfs is to generate a single 619 * directory entry at a time (struct dirent) and then 620 * copy that out to userland using uiomove. a more efficent 621 * though more complex implementation, would try to minimize 622 * the number of calls to uiomove(). for ptyfs, this is 623 * hardly worth the added code complexity. 624 * 625 * this should just be done through read() 626 */ 627 int 628 ptyfs_readdir(void *v) 629 { 630 struct vop_readdir_args /* { 631 struct vnode *a_vp; 632 struct uio *a_uio; 633 kauth_cred_t a_cred; 634 int *a_eofflag; 635 off_t **a_cookies; 636 int *a_ncookies; 637 } */ *ap = v; 638 struct uio *uio = ap->a_uio; 639 struct dirent *dp; 640 struct ptyfsnode *ptyfs; 641 off_t i; 642 int error; 643 off_t *cookies = NULL; 644 int ncookies; 645 struct vnode *vp; 646 int nc = 0; 647 648 vp = ap->a_vp; 649 ptyfs = VTOPTYFS(vp); 650 651 if (uio->uio_resid < UIO_MX) 652 return EINVAL; 653 if (uio->uio_offset < 0) 654 return EINVAL; 655 656 dp = malloc(sizeof(struct dirent), M_PTYFSTMP, M_WAITOK | M_ZERO); 657 658 error = 0; 659 i = uio->uio_offset; 660 dp->d_reclen = UIO_MX; 661 ncookies = uio->uio_resid / UIO_MX; 662 663 if (ptyfs->ptyfs_type != PTYFSroot) { 664 error = ENOTDIR; 665 goto out; 666 } 667 668 if (i >= npty) 669 goto out; 670 671 if (ap->a_ncookies) { 672 ncookies = min(ncookies, (npty + 2 - i)); 673 cookies = malloc(ncookies * sizeof (off_t), 674 M_TEMP, M_WAITOK); 675 *ap->a_cookies = cookies; 676 } 677 678 for (; i < 2; i++) { 679 /* `.' and/or `..' */ 680 dp->d_fileno = PTYFS_FILENO(0, PTYFSroot); 681 dp->d_namlen = i + 1; 682 (void)memcpy(dp->d_name, "..", dp->d_namlen); 683 dp->d_name[i + 1] = '\0'; 684 dp->d_type = DT_DIR; 685 if ((error = uiomove(dp, UIO_MX, uio)) != 0) 686 goto out; 687 if (cookies) 688 *cookies++ = i + 1; 689 nc++; 690 } 691 for (; uio->uio_resid >= UIO_MX && i < npty; i++) { 692 /* check for used ptys */ 693 if (pty_isfree(i - 2, 1)) 694 continue; 695 696 dp->d_fileno = PTYFS_FILENO(i - 2, PTYFSpts); 697 dp->d_namlen = snprintf(dp->d_name, sizeof(dp->d_name), 698 "%lld", (long long)(i - 2)); 699 dp->d_type = DT_CHR; 700 if ((error = uiomove(dp, UIO_MX, uio)) != 0) 701 goto out; 702 if (cookies) 703 *cookies++ = i + 1; 704 nc++; 705 } 706 707 out: 708 /* not pertinent in error cases */ 709 ncookies = nc; 710 711 if (ap->a_ncookies) { 712 if (error) { 713 if (cookies) 714 free(*ap->a_cookies, M_TEMP); 715 *ap->a_ncookies = 0; 716 *ap->a_cookies = NULL; 717 } else 718 *ap->a_ncookies = ncookies; 719 } 720 uio->uio_offset = i; 721 free(dp, M_PTYFSTMP); 722 return error; 723 } 724 725 int 726 ptyfs_open(void *v) 727 { 728 struct vop_open_args /* { 729 struct vnode *a_vp; 730 int a_mode; 731 kauth_cred_t a_cred; 732 } */ *ap = v; 733 struct vnode *vp = ap->a_vp; 734 struct ptyfsnode *ptyfs = VTOPTYFS(vp); 735 736 ptyfs->ptyfs_flag |= PTYFS_CHANGE|PTYFS_ACCESS; 737 switch (ptyfs->ptyfs_type) { 738 case PTYFSpts: 739 case PTYFSptc: 740 return spec_open(v); 741 case PTYFSroot: 742 return 0; 743 default: 744 return EINVAL; 745 } 746 } 747 748 int 749 ptyfs_close(void *v) 750 { 751 struct vop_close_args /* { 752 struct vnode *a_vp; 753 int a_fflag; 754 kauth_cred_t a_cred; 755 } */ *ap = v; 756 struct vnode *vp = ap->a_vp; 757 struct ptyfsnode *ptyfs = VTOPTYFS(vp); 758 759 mutex_enter(&vp->v_interlock); 760 if (vp->v_usecount > 1) 761 PTYFS_ITIMES(ptyfs, NULL, NULL, NULL); 762 mutex_exit(&vp->v_interlock); 763 764 switch (ptyfs->ptyfs_type) { 765 case PTYFSpts: 766 case PTYFSptc: 767 return spec_close(v); 768 case PTYFSroot: 769 return 0; 770 default: 771 return EINVAL; 772 } 773 } 774 775 int 776 ptyfs_read(void *v) 777 { 778 struct vop_read_args /* { 779 struct vnode *a_vp; 780 struct uio *a_uio; 781 int a_ioflag; 782 kauth_cred_t a_cred; 783 } */ *ap = v; 784 struct timespec ts; 785 struct vnode *vp = ap->a_vp; 786 struct ptyfsnode *ptyfs = VTOPTYFS(vp); 787 int error; 788 789 ptyfs->ptyfs_flag |= PTYFS_ACCESS; 790 /* hardclock() resolution is good enough for ptyfs */ 791 getnanotime(&ts); 792 (void)ptyfs_update(vp, &ts, &ts, 0); 793 794 switch (ptyfs->ptyfs_type) { 795 case PTYFSpts: 796 case PTYFSptc: 797 VOP_UNLOCK(vp, 0); 798 error = cdev_read(vp->v_rdev, ap->a_uio, ap->a_ioflag); 799 vn_lock(vp, LK_RETRY|LK_EXCLUSIVE); 800 return error; 801 default: 802 return EOPNOTSUPP; 803 } 804 } 805 806 int 807 ptyfs_write(void *v) 808 { 809 struct vop_write_args /* { 810 struct vnode *a_vp; 811 struct uio *a_uio; 812 int a_ioflag; 813 kauth_cred_t a_cred; 814 } */ *ap = v; 815 struct timespec ts; 816 struct vnode *vp = ap->a_vp; 817 struct ptyfsnode *ptyfs = VTOPTYFS(vp); 818 int error; 819 820 ptyfs->ptyfs_flag |= PTYFS_MODIFY; 821 getnanotime(&ts); 822 (void)ptyfs_update(vp, &ts, &ts, 0); 823 824 switch (ptyfs->ptyfs_type) { 825 case PTYFSpts: 826 case PTYFSptc: 827 VOP_UNLOCK(vp, 0); 828 error = cdev_write(vp->v_rdev, ap->a_uio, ap->a_ioflag); 829 vn_lock(vp, LK_RETRY|LK_EXCLUSIVE); 830 return error; 831 default: 832 return EOPNOTSUPP; 833 } 834 } 835 836 int 837 ptyfs_ioctl(void *v) 838 { 839 struct vop_ioctl_args /* { 840 struct vnode *a_vp; 841 u_long a_command; 842 void *a_data; 843 int a_fflag; 844 kauth_cred_t a_cred; 845 } */ *ap = v; 846 struct vnode *vp = ap->a_vp; 847 struct ptyfsnode *ptyfs = VTOPTYFS(vp); 848 849 switch (ptyfs->ptyfs_type) { 850 case PTYFSpts: 851 case PTYFSptc: 852 return cdev_ioctl(vp->v_rdev, ap->a_command, 853 ap->a_data, ap->a_fflag, curlwp); 854 default: 855 return EOPNOTSUPP; 856 } 857 } 858 859 int 860 ptyfs_poll(void *v) 861 { 862 struct vop_poll_args /* { 863 struct vnode *a_vp; 864 int a_events; 865 } */ *ap = v; 866 struct vnode *vp = ap->a_vp; 867 struct ptyfsnode *ptyfs = VTOPTYFS(vp); 868 869 switch (ptyfs->ptyfs_type) { 870 case PTYFSpts: 871 case PTYFSptc: 872 return cdev_poll(vp->v_rdev, ap->a_events, curlwp); 873 default: 874 return genfs_poll(v); 875 } 876 } 877 878 int 879 ptyfs_kqfilter(void *v) 880 { 881 struct vop_kqfilter_args /* { 882 struct vnode *a_vp; 883 struct knote *a_kn; 884 } */ *ap = v; 885 struct vnode *vp = ap->a_vp; 886 struct ptyfsnode *ptyfs = VTOPTYFS(vp); 887 888 switch (ptyfs->ptyfs_type) { 889 case PTYFSpts: 890 case PTYFSptc: 891 return cdev_kqfilter(vp->v_rdev, ap->a_kn); 892 default: 893 return genfs_kqfilter(v); 894 } 895 } 896 897 static int 898 ptyfs_update(struct vnode *vp, const struct timespec *acc, 899 const struct timespec *mod, int flags) 900 { 901 struct ptyfsnode *ptyfs = VTOPTYFS(vp); 902 903 if (vp->v_mount->mnt_flag & MNT_RDONLY) 904 return 0; 905 906 PTYFS_ITIMES(ptyfs, acc, mod, NULL); 907 return 0; 908 } 909 910 void 911 ptyfs_itimes(struct ptyfsnode *ptyfs, const struct timespec *acc, 912 const struct timespec *mod, const struct timespec *cre) 913 { 914 struct timespec now; 915 916 KASSERT(ptyfs->ptyfs_flag & (PTYFS_ACCESS|PTYFS_CHANGE|PTYFS_MODIFY)); 917 918 getnanotime(&now); 919 if (ptyfs->ptyfs_flag & PTYFS_ACCESS) { 920 if (acc == NULL) 921 acc = &now; 922 ptyfs->ptyfs_atime = *acc; 923 } 924 if (ptyfs->ptyfs_flag & PTYFS_MODIFY) { 925 if (mod == NULL) 926 mod = &now; 927 ptyfs->ptyfs_mtime = *mod; 928 } 929 if (ptyfs->ptyfs_flag & PTYFS_CHANGE) { 930 if (cre == NULL) 931 cre = &now; 932 ptyfs->ptyfs_ctime = *cre; 933 } 934 ptyfs->ptyfs_flag &= ~(PTYFS_ACCESS|PTYFS_CHANGE|PTYFS_MODIFY); 935 } 936 937 /* 938 * convert decimal ascii to int 939 */ 940 static int 941 atoi(const char *b, size_t len) 942 { 943 int p = 0; 944 945 while (len--) { 946 char c = *b++; 947 if (c < '0' || c > '9') 948 return -1; 949 p = 10 * p + (c - '0'); 950 } 951 952 return p; 953 } 954
Indexes created Sun Sep 28 07:09:56 GMT 2025