ptyfs_vnops.c revision 1.28
1 /* $NetBSD: ptyfs_vnops.c,v 1.28 2009/04/20 18:06:27 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 1.28 2009/04/20 18:06:27 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 if (kauth_cred_geteuid(cred) != ptyfs->ptyfs_uid && 423 (error = kauth_authorize_generic(cred, KAUTH_GENERIC_ISSUSER, 424 NULL)) && 425 ((vap->va_vaflags & VA_UTIMES_NULL) == 0 || 426 (error = VOP_ACCESS(vp, VWRITE, cred)) != 0)) 427 return (error); 428 if (vap->va_atime.tv_sec != VNOVAL) 429 if (!(vp->v_mount->mnt_flag & MNT_NOATIME)) 430 ptyfs->ptyfs_flag |= PTYFS_ACCESS; 431 if (vap->va_mtime.tv_sec != VNOVAL) 432 ptyfs->ptyfs_flag |= PTYFS_CHANGE | PTYFS_MODIFY; 433 if (vap->va_birthtime.tv_sec != VNOVAL) 434 ptyfs->ptyfs_birthtime = vap->va_birthtime; 435 ptyfs->ptyfs_flag |= PTYFS_CHANGE; 436 error = ptyfs_update(vp, &vap->va_atime, &vap->va_mtime, 0); 437 if (error) 438 return error; 439 } 440 if (vap->va_mode != (mode_t)VNOVAL) { 441 if (vp->v_mount->mnt_flag & MNT_RDONLY) 442 return EROFS; 443 if (ptyfs->ptyfs_type == PTYFSroot) 444 return EPERM; 445 if ((ptyfs->ptyfs_flags & SF_SNAPSHOT) != 0 && 446 (vap->va_mode & 447 (S_IXUSR|S_IWUSR|S_IXGRP|S_IWGRP|S_IXOTH|S_IWOTH))) 448 return EPERM; 449 error = ptyfs_chmod(vp, vap->va_mode, cred, l); 450 if (error) 451 return error; 452 } 453 VN_KNOTE(vp, NOTE_ATTRIB); 454 return 0; 455 } 456 457 /* 458 * Change the mode on a file. 459 * Inode must be locked before calling. 460 */ 461 static int 462 ptyfs_chmod(struct vnode *vp, mode_t mode, kauth_cred_t cred, struct lwp *l) 463 { 464 struct ptyfsnode *ptyfs = VTOPTYFS(vp); 465 int error; 466 467 error = common_chmod_allowed(cred, vp, ptyfs->ptyfs_uid, 468 ptyfs->ptyfs_gid, mode); 469 if (error) 470 return (error); 471 472 ptyfs->ptyfs_mode &= ~ALLPERMS; 473 ptyfs->ptyfs_mode |= (mode & ALLPERMS); 474 return 0; 475 } 476 477 /* 478 * Perform chown operation on inode ip; 479 * inode must be locked prior to call. 480 */ 481 static int 482 ptyfs_chown(struct vnode *vp, uid_t uid, gid_t gid, kauth_cred_t cred, 483 struct lwp *l) 484 { 485 struct ptyfsnode *ptyfs = VTOPTYFS(vp); 486 int error; 487 488 if (uid == (uid_t)VNOVAL) 489 uid = ptyfs->ptyfs_uid; 490 if (gid == (gid_t)VNOVAL) 491 gid = ptyfs->ptyfs_gid; 492 493 error = common_chown_allowed(cred, ptyfs->ptyfs_uid, ptyfs->ptyfs_gid, 494 uid, gid); 495 if (error) 496 return (error); 497 498 ptyfs->ptyfs_gid = gid; 499 ptyfs->ptyfs_uid = uid; 500 return 0; 501 } 502 503 /* 504 * implement access checking. 505 * 506 * actually, the check for super-user is slightly 507 * broken since it will allow read access to write-only 508 * objects. this doesn't cause any particular trouble 509 * but does mean that the i/o entry points need to check 510 * that the operation really does make sense. 511 */ 512 int 513 ptyfs_access(void *v) 514 { 515 struct vop_access_args /* { 516 struct vnode *a_vp; 517 int a_mode; 518 kauth_cred_t a_cred; 519 } */ *ap = v; 520 struct vattr va; 521 int error; 522 523 if ((error = VOP_GETATTR(ap->a_vp, &va, ap->a_cred)) != 0) 524 return error; 525 526 return vaccess(va.va_type, va.va_mode, 527 va.va_uid, va.va_gid, ap->a_mode, ap->a_cred); 528 } 529 530 /* 531 * lookup. this is incredibly complicated in the 532 * general case, however for most pseudo-filesystems 533 * very little needs to be done. 534 * 535 * Locking isn't hard here, just poorly documented. 536 * 537 * If we're looking up ".", just vref the parent & return it. 538 * 539 * If we're looking up "..", unlock the parent, and lock "..". If everything 540 * went ok, try to re-lock the parent. We do this to prevent lock races. 541 * 542 * For anything else, get the needed node. 543 * 544 * We try to exit with the parent locked in error cases. 545 */ 546 int 547 ptyfs_lookup(void *v) 548 { 549 struct vop_lookup_args /* { 550 struct vnode * a_dvp; 551 struct vnode ** a_vpp; 552 struct componentname * a_cnp; 553 } */ *ap = v; 554 struct componentname *cnp = ap->a_cnp; 555 struct vnode **vpp = ap->a_vpp; 556 struct vnode *dvp = ap->a_dvp; 557 const char *pname = cnp->cn_nameptr; 558 struct ptyfsnode *ptyfs; 559 int pty, error; 560 561 *vpp = NULL; 562 563 if (cnp->cn_nameiop == DELETE || cnp->cn_nameiop == RENAME) 564 return EROFS; 565 566 if (cnp->cn_namelen == 1 && *pname == '.') { 567 *vpp = dvp; 568 VREF(dvp); 569 return 0; 570 } 571 572 ptyfs = VTOPTYFS(dvp); 573 switch (ptyfs->ptyfs_type) { 574 case PTYFSroot: 575 /* 576 * Shouldn't get here with .. in the root node. 577 */ 578 if (cnp->cn_flags & ISDOTDOT) 579 return EIO; 580 581 pty = atoi(pname, cnp->cn_namelen); 582 583 if (pty < 0 || pty >= npty || pty_isfree(pty, 1)) 584 break; 585 586 error = ptyfs_allocvp(dvp->v_mount, vpp, PTYFSpts, pty, 587 curlwp); 588 return error; 589 590 default: 591 return ENOTDIR; 592 } 593 594 return cnp->cn_nameiop == LOOKUP ? ENOENT : EROFS; 595 } 596 597 /* 598 * readdir returns directory entries from ptyfsnode (vp). 599 * 600 * the strategy here with ptyfs is to generate a single 601 * directory entry at a time (struct dirent) and then 602 * copy that out to userland using uiomove. a more efficent 603 * though more complex implementation, would try to minimize 604 * the number of calls to uiomove(). for ptyfs, this is 605 * hardly worth the added code complexity. 606 * 607 * this should just be done through read() 608 */ 609 int 610 ptyfs_readdir(void *v) 611 { 612 struct vop_readdir_args /* { 613 struct vnode *a_vp; 614 struct uio *a_uio; 615 kauth_cred_t a_cred; 616 int *a_eofflag; 617 off_t **a_cookies; 618 int *a_ncookies; 619 } */ *ap = v; 620 struct uio *uio = ap->a_uio; 621 struct dirent *dp; 622 struct ptyfsnode *ptyfs; 623 off_t i; 624 int error; 625 off_t *cookies = NULL; 626 int ncookies; 627 struct vnode *vp; 628 int nc = 0; 629 630 vp = ap->a_vp; 631 ptyfs = VTOPTYFS(vp); 632 633 if (uio->uio_resid < UIO_MX) 634 return EINVAL; 635 if (uio->uio_offset < 0) 636 return EINVAL; 637 638 dp = malloc(sizeof(struct dirent), M_PTYFSTMP, M_WAITOK | M_ZERO); 639 640 error = 0; 641 i = uio->uio_offset; 642 dp->d_reclen = UIO_MX; 643 ncookies = uio->uio_resid / UIO_MX; 644 645 if (ptyfs->ptyfs_type != PTYFSroot) { 646 error = ENOTDIR; 647 goto out; 648 } 649 650 if (i >= npty) 651 goto out; 652 653 if (ap->a_ncookies) { 654 ncookies = min(ncookies, (npty + 2 - i)); 655 cookies = malloc(ncookies * sizeof (off_t), 656 M_TEMP, M_WAITOK); 657 *ap->a_cookies = cookies; 658 } 659 660 for (; i < 2; i++) { 661 /* `.' and/or `..' */ 662 dp->d_fileno = PTYFS_FILENO(0, PTYFSroot); 663 dp->d_namlen = i + 1; 664 (void)memcpy(dp->d_name, "..", dp->d_namlen); 665 dp->d_name[i + 1] = '\0'; 666 dp->d_type = DT_DIR; 667 if ((error = uiomove(dp, UIO_MX, uio)) != 0) 668 goto out; 669 if (cookies) 670 *cookies++ = i + 1; 671 nc++; 672 } 673 for (; uio->uio_resid >= UIO_MX && i < npty; i++) { 674 /* check for used ptys */ 675 if (pty_isfree(i - 2, 1)) 676 continue; 677 678 dp->d_fileno = PTYFS_FILENO(i - 2, PTYFSpts); 679 dp->d_namlen = snprintf(dp->d_name, sizeof(dp->d_name), 680 "%lld", (long long)(i - 2)); 681 dp->d_type = DT_CHR; 682 if ((error = uiomove(dp, UIO_MX, uio)) != 0) 683 goto out; 684 if (cookies) 685 *cookies++ = i + 1; 686 nc++; 687 } 688 689 out: 690 /* not pertinent in error cases */ 691 ncookies = nc; 692 693 if (ap->a_ncookies) { 694 if (error) { 695 if (cookies) 696 free(*ap->a_cookies, M_TEMP); 697 *ap->a_ncookies = 0; 698 *ap->a_cookies = NULL; 699 } else 700 *ap->a_ncookies = ncookies; 701 } 702 uio->uio_offset = i; 703 free(dp, M_PTYFSTMP); 704 return error; 705 } 706 707 int 708 ptyfs_open(void *v) 709 { 710 struct vop_open_args /* { 711 struct vnode *a_vp; 712 int a_mode; 713 kauth_cred_t a_cred; 714 } */ *ap = v; 715 struct vnode *vp = ap->a_vp; 716 struct ptyfsnode *ptyfs = VTOPTYFS(vp); 717 718 ptyfs->ptyfs_flag |= PTYFS_CHANGE|PTYFS_ACCESS; 719 switch (ptyfs->ptyfs_type) { 720 case PTYFSpts: 721 case PTYFSptc: 722 return spec_open(v); 723 case PTYFSroot: 724 return 0; 725 default: 726 return EINVAL; 727 } 728 } 729 730 int 731 ptyfs_close(void *v) 732 { 733 struct vop_close_args /* { 734 struct vnode *a_vp; 735 int a_fflag; 736 kauth_cred_t a_cred; 737 } */ *ap = v; 738 struct vnode *vp = ap->a_vp; 739 struct ptyfsnode *ptyfs = VTOPTYFS(vp); 740 741 mutex_enter(&vp->v_interlock); 742 if (vp->v_usecount > 1) 743 PTYFS_ITIMES(ptyfs, NULL, NULL, NULL); 744 mutex_exit(&vp->v_interlock); 745 746 switch (ptyfs->ptyfs_type) { 747 case PTYFSpts: 748 case PTYFSptc: 749 return spec_close(v); 750 case PTYFSroot: 751 return 0; 752 default: 753 return EINVAL; 754 } 755 } 756 757 int 758 ptyfs_read(void *v) 759 { 760 struct vop_read_args /* { 761 struct vnode *a_vp; 762 struct uio *a_uio; 763 int a_ioflag; 764 kauth_cred_t a_cred; 765 } */ *ap = v; 766 struct timespec ts; 767 struct vnode *vp = ap->a_vp; 768 struct ptyfsnode *ptyfs = VTOPTYFS(vp); 769 int error; 770 771 ptyfs->ptyfs_flag |= PTYFS_ACCESS; 772 /* hardclock() resolution is good enough for ptyfs */ 773 getnanotime(&ts); 774 (void)ptyfs_update(vp, &ts, &ts, 0); 775 776 switch (ptyfs->ptyfs_type) { 777 case PTYFSpts: 778 case PTYFSptc: 779 VOP_UNLOCK(vp, 0); 780 error = cdev_read(vp->v_rdev, ap->a_uio, ap->a_ioflag); 781 vn_lock(vp, LK_RETRY|LK_EXCLUSIVE); 782 return error; 783 default: 784 return EOPNOTSUPP; 785 } 786 } 787 788 int 789 ptyfs_write(void *v) 790 { 791 struct vop_write_args /* { 792 struct vnode *a_vp; 793 struct uio *a_uio; 794 int a_ioflag; 795 kauth_cred_t a_cred; 796 } */ *ap = v; 797 struct timespec ts; 798 struct vnode *vp = ap->a_vp; 799 struct ptyfsnode *ptyfs = VTOPTYFS(vp); 800 int error; 801 802 ptyfs->ptyfs_flag |= PTYFS_MODIFY; 803 getnanotime(&ts); 804 (void)ptyfs_update(vp, &ts, &ts, 0); 805 806 switch (ptyfs->ptyfs_type) { 807 case PTYFSpts: 808 case PTYFSptc: 809 VOP_UNLOCK(vp, 0); 810 error = cdev_write(vp->v_rdev, ap->a_uio, ap->a_ioflag); 811 vn_lock(vp, LK_RETRY|LK_EXCLUSIVE); 812 return error; 813 default: 814 return EOPNOTSUPP; 815 } 816 } 817 818 int 819 ptyfs_ioctl(void *v) 820 { 821 struct vop_ioctl_args /* { 822 struct vnode *a_vp; 823 u_long a_command; 824 void *a_data; 825 int a_fflag; 826 kauth_cred_t a_cred; 827 } */ *ap = v; 828 struct vnode *vp = ap->a_vp; 829 struct ptyfsnode *ptyfs = VTOPTYFS(vp); 830 831 switch (ptyfs->ptyfs_type) { 832 case PTYFSpts: 833 case PTYFSptc: 834 return cdev_ioctl(vp->v_rdev, ap->a_command, 835 ap->a_data, ap->a_fflag, curlwp); 836 default: 837 return EOPNOTSUPP; 838 } 839 } 840 841 int 842 ptyfs_poll(void *v) 843 { 844 struct vop_poll_args /* { 845 struct vnode *a_vp; 846 int a_events; 847 } */ *ap = v; 848 struct vnode *vp = ap->a_vp; 849 struct ptyfsnode *ptyfs = VTOPTYFS(vp); 850 851 switch (ptyfs->ptyfs_type) { 852 case PTYFSpts: 853 case PTYFSptc: 854 return cdev_poll(vp->v_rdev, ap->a_events, curlwp); 855 default: 856 return genfs_poll(v); 857 } 858 } 859 860 int 861 ptyfs_kqfilter(void *v) 862 { 863 struct vop_kqfilter_args /* { 864 struct vnode *a_vp; 865 struct knote *a_kn; 866 } */ *ap = v; 867 struct vnode *vp = ap->a_vp; 868 struct ptyfsnode *ptyfs = VTOPTYFS(vp); 869 870 switch (ptyfs->ptyfs_type) { 871 case PTYFSpts: 872 case PTYFSptc: 873 return cdev_kqfilter(vp->v_rdev, ap->a_kn); 874 default: 875 return genfs_kqfilter(v); 876 } 877 } 878 879 static int 880 ptyfs_update(struct vnode *vp, const struct timespec *acc, 881 const struct timespec *mod, int flags) 882 { 883 struct ptyfsnode *ptyfs = VTOPTYFS(vp); 884 885 if (vp->v_mount->mnt_flag & MNT_RDONLY) 886 return 0; 887 888 PTYFS_ITIMES(ptyfs, acc, mod, NULL); 889 return 0; 890 } 891 892 void 893 ptyfs_itimes(struct ptyfsnode *ptyfs, const struct timespec *acc, 894 const struct timespec *mod, const struct timespec *cre) 895 { 896 struct timespec now; 897 898 KASSERT(ptyfs->ptyfs_flag & (PTYFS_ACCESS|PTYFS_CHANGE|PTYFS_MODIFY)); 899 900 getnanotime(&now); 901 if (ptyfs->ptyfs_flag & PTYFS_ACCESS) { 902 if (acc == NULL) 903 acc = &now; 904 ptyfs->ptyfs_atime = *acc; 905 } 906 if (ptyfs->ptyfs_flag & PTYFS_MODIFY) { 907 if (mod == NULL) 908 mod = &now; 909 ptyfs->ptyfs_mtime = *mod; 910 } 911 if (ptyfs->ptyfs_flag & PTYFS_CHANGE) { 912 if (cre == NULL) 913 cre = &now; 914 ptyfs->ptyfs_ctime = *cre; 915 } 916 ptyfs->ptyfs_flag &= ~(PTYFS_ACCESS|PTYFS_CHANGE|PTYFS_MODIFY); 917 } 918 919 /* 920 * convert decimal ascii to int 921 */ 922 static int 923 atoi(const char *b, size_t len) 924 { 925 int p = 0; 926 927 while (len--) { 928 char c = *b++; 929 if (c < '0' || c > '9') 930 return -1; 931 p = 10 * p + (c - '0'); 932 } 933 934 return p; 935 } 936
Indexes created Sun Sep 28 12:09:53 GMT 2025