perfuse.c revision 1.13
1 /* $NetBSD: perfuse.c,v 1.13 2011/05/12 10:32:41 manu Exp $ */ 2 3 /*- 4 * Copyright (c) 2010-2011 Emmanuel Dreyfus. All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 16 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 17 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 18 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 19 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 20 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 21 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 22 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 23 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 24 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 25 * POSSIBILITY OF SUCH DAMAGE. 26 */ 27 28 #include <stdio.h> 29 #include <unistd.h> 30 #include <stdlib.h> 31 #include <fcntl.h> 32 #include <string.h> 33 #include <errno.h> 34 #include <puffs.h> 35 #include <sys/types.h> 36 #include <sys/socket.h> 37 #include <sys/un.h> 38 #include <machine/vmparam.h> 39 40 #define LIBPERFUSE 41 #include "perfuse.h" 42 #include "perfuse_if.h" 43 #include "perfuse_priv.h" 44 45 int perfuse_diagflags = 0; /* global used only in DPRINTF/DERR/DWARN */ 46 extern char **environ; 47 48 static struct perfuse_state *init_state(void); 49 static int get_fd(const char *); 50 51 52 static struct perfuse_state * 53 init_state(void) 54 { 55 struct perfuse_state *ps; 56 char opts[1024]; 57 58 if ((ps = malloc(sizeof(*ps))) == NULL) 59 DERR(EX_OSERR, "malloc failed"); 60 61 (void)memset(ps, 0, sizeof(*ps)); 62 ps->ps_max_write = UINT_MAX; 63 ps->ps_max_readahead = UINT_MAX; 64 65 /* 66 * Most of the time, access() is broken because the filesystem 67 * performs the check with root privileges. glusterfs will do that 68 * if the Linux-specific setfsuid() is missing, for instance. 69 */ 70 ps->ps_flags |= PS_NO_ACCESS; 71 72 /* 73 * This is a temporary way to toggle access and creat usage. 74 * It would be nice if that could be provided as mount options, 75 * but that will not be obvious to do. 76 */ 77 if (getenv_r("PERFUSE_OPTIONS", opts, sizeof(opts)) != -1) { 78 char *optname; 79 char *last; 80 81 for ((optname = strtok_r(opts, ",", &last)); 82 optname != NULL; 83 (optname = strtok_r(NULL, ",", &last))) { 84 if (strcmp(optname, "enable_access") == 0) 85 ps->ps_flags &= ~PS_NO_ACCESS; 86 87 if (strcmp(optname, "disable_access") == 0) 88 ps->ps_flags |= PS_NO_ACCESS; 89 90 if (strcmp(optname, "enable_creat") == 0) 91 ps->ps_flags &= ~PS_NO_CREAT; 92 93 if (strcmp(optname, "disable_creat") == 0) 94 ps->ps_flags |= PS_NO_CREAT; 95 } 96 } 97 98 99 return ps; 100 } 101 102 103 static int 104 get_fd(data) 105 const char *data; 106 { 107 char *string; 108 const char fdopt[] = "fd="; 109 char *lastp; 110 char *opt; 111 int fd = -1; 112 113 if ((string = strdup(data)) == NULL) 114 return -1; 115 116 for (opt = strtok_r(string, ",", &lastp); 117 opt != NULL; 118 opt = strtok_r(NULL, ",", &lastp)) { 119 if (strncmp(opt, fdopt, strlen(fdopt)) == 0) { 120 fd = atoi(opt + strlen(fdopt)); 121 break; 122 } 123 } 124 125 /* 126 * No file descriptor found 127 */ 128 if (fd == -1) 129 errno = EINVAL; 130 131 free(string); 132 return fd; 133 134 } 135 136 int 137 perfuse_open(path, flags, mode) 138 const char *path; 139 int flags; 140 mode_t mode; 141 { 142 int sv[2]; 143 struct sockaddr_un sun; 144 struct sockaddr *sa; 145 char progname[] = _PATH_PERFUSED; 146 char minus_i[] = "-i"; 147 char fdstr[16]; 148 char *const argv[] = { progname, minus_i, fdstr, NULL}; 149 uint32_t opt; 150 uint32_t optlen; 151 152 if (strcmp(path, _PATH_FUSE) != 0) 153 return open(path, flags, mode); 154 155 if ((sv[0] = socket(PF_LOCAL, SOCK_DGRAM, 0)) == -1) { 156 #ifdef PERFUSE_DEBUG 157 DWARN("%s:%d socket failed: %s", __func__, __LINE__); 158 #endif 159 return -1; 160 } 161 162 /* 163 * Set a buffer lentgh large enough so that any FUSE packet 164 * will fit. 165 */ 166 opt = FUSE_BUFSIZE; 167 optlen = sizeof(opt); 168 if (setsockopt(sv[0], SOL_SOCKET, SO_SNDBUF, &opt, optlen) != 0) 169 DWARN("%s: setsockopt SO_SNDBUF to %d failed", __func__, opt); 170 171 opt = FUSE_BUFSIZE; 172 optlen = sizeof(opt); 173 if (setsockopt(sv[0], SOL_SOCKET, SO_RCVBUF, &opt, optlen) != 0) 174 DWARN("%s: setsockopt SO_RCVBUF to %d failed", __func__, opt); 175 176 sa = (struct sockaddr *)(void *)&sun; 177 sun.sun_len = sizeof(sun); 178 sun.sun_family = AF_LOCAL; 179 (void)strcpy(sun.sun_path, path); 180 181 if (connect(sv[0], sa, (socklen_t)sun.sun_len) == 0) 182 return sv[0]; 183 184 185 /* 186 * Attempt to run perfused on our own 187 * if it does not run yet; In that case 188 * we will talk using a socketpair 189 * instead of /dev/fuse. 190 */ 191 if (socketpair(PF_LOCAL, SOCK_DGRAM, 0, sv) != 0) { 192 DWARN("%s:%d: socketpair failed", __func__, __LINE__); 193 return -1; 194 } 195 196 /* 197 * Set a buffer lentgh large enough so that any FUSE packet 198 * will fit. 199 */ 200 opt = FUSE_BUFSIZE; 201 optlen = sizeof(opt); 202 if (setsockopt(sv[0], SOL_SOCKET, SO_SNDBUF, &opt, optlen) != 0) 203 DWARN("%s: setsockopt SO_SNDBUF to %d failed", __func__, opt); 204 205 opt = FUSE_BUFSIZE; 206 optlen = sizeof(opt); 207 if (setsockopt(sv[0], SOL_SOCKET, SO_RCVBUF, &opt, optlen) != 0) 208 DWARN("%s: setsockopt SO_RCVBUF to %d failed", __func__, opt); 209 210 opt = FUSE_BUFSIZE; 211 optlen = sizeof(opt); 212 if (setsockopt(sv[1], SOL_SOCKET, SO_SNDBUF, &opt, optlen) != 0) 213 DWARN("%s: setsockopt SO_SNDBUF to %d failed", __func__, opt); 214 215 opt = FUSE_BUFSIZE; 216 optlen = sizeof(opt); 217 if (setsockopt(sv[1], SOL_SOCKET, SO_RCVBUF, &opt, optlen) != 0) 218 DWARN("%s: setsockopt SO_RCVBUF to %d failed", __func__, opt); 219 220 /* 221 * Request peer credentials. This musr be done before first 222 * frame is sent. 223 */ 224 opt = 1; 225 optlen = sizeof(opt); 226 if (setsockopt(sv[1], 0, LOCAL_CREDS, &opt, optlen) != 0) 227 DWARN("%s: setsockopt LOCAL_CREDS failed", __func__); 228 229 (void)sprintf(fdstr, "%d", sv[1]); 230 231 switch(fork()) { 232 case -1: 233 #ifdef PERFUSE_DEBUG 234 DWARN("%s:%d: fork failed", __func__, __LINE__); 235 #endif 236 return -1; 237 /* NOTREACHED */ 238 break; 239 case 0: 240 (void)execve(argv[0], argv, environ); 241 #ifdef PERFUSE_DEBUG 242 DWARN("%s:%d: execve failed", __func__, __LINE__); 243 #endif 244 return -1; 245 /* NOTREACHED */ 246 break; 247 default: 248 break; 249 } 250 251 return sv[0]; 252 } 253 254 int 255 perfuse_mount(source, target, filesystemtype, mountflags, data) 256 const char *source; 257 const char *target; 258 const char *filesystemtype; 259 long mountflags; 260 const void *data; 261 { 262 int s; 263 size_t len; 264 struct perfuse_mount_out *pmo; 265 struct sockaddr_storage ss; 266 struct sockaddr_un *sun; 267 struct sockaddr *sa; 268 socklen_t sa_len; 269 size_t sock_len; 270 char *frame; 271 char *cp; 272 273 #ifdef PERFUSE_DEBUG 274 if (perfuse_diagflags & PDF_MISC) 275 DPRINTF("%s(\"%s\", \"%s\", \"%s\", 0x%lx, \"%s\")\n", 276 __func__, source, target, filesystemtype, 277 mountflags, (const char *)data); 278 #endif 279 280 if ((s = get_fd(data)) == -1) 281 return -1; 282 283 /* 284 * If we are connected to /dev/fuse, we need a second 285 * socket to get replies from perfused. 286 * XXX This socket is not removed at exit time yet 287 */ 288 sock_len = 0; 289 sa = (struct sockaddr *)(void *)&ss; 290 sun = (struct sockaddr_un *)(void *)&ss; 291 sa_len = sizeof(ss); 292 if ((getpeername(s, sa, &sa_len) == 0) && 293 (sa->sa_family = AF_LOCAL) && 294 (strcmp(sun->sun_path, _PATH_FUSE) == 0)) { 295 296 sun->sun_len = sizeof(*sun); 297 sun->sun_family = AF_LOCAL; 298 (void)sprintf(sun->sun_path, "%s/%s-%d", 299 _PATH_TMP, getprogname(), getpid()); 300 301 if (bind(s, sa, (socklen_t)sa->sa_len) != 0) 302 DERR(EX_OSERR, "%s:%d bind to \"%s\" failed", 303 __func__, __LINE__, sun->sun_path); 304 305 sock_len = strlen(sun->sun_path) + 1; 306 } 307 308 len = sizeof(*pmo); 309 len += source ? (uint32_t)strlen(source) + 1 : 0; 310 len += target ? (uint32_t)strlen(target) + 1 : 0; 311 len += filesystemtype ? (uint32_t)strlen(filesystemtype) + 1 : 0; 312 len += data ? (uint32_t)strlen(data) + 1 : 0; 313 len += sock_len; 314 315 if ((frame = malloc(len)) == NULL) { 316 #ifdef PERFUSE_DEBUG 317 if (perfuse_diagflags & PDF_MISC) 318 DWARN("%s:%d malloc failed", __func__, __LINE__); 319 #endif 320 return -1; 321 } 322 323 pmo = (struct perfuse_mount_out *)(void *)frame; 324 pmo->pmo_len = (uint32_t)len; 325 pmo->pmo_error = 0; 326 pmo->pmo_unique = (uint64_t)-1; 327 (void)strcpy(pmo->pmo_magic, PERFUSE_MOUNT_MAGIC); 328 329 pmo->pmo_source_len = source ? (uint32_t)strlen(source) + 1 : 0; 330 pmo->pmo_target_len = target ? (uint32_t)strlen(target) + 1: 0; 331 pmo->pmo_filesystemtype_len = 332 filesystemtype ? (uint32_t)strlen(filesystemtype) + 1 : 0; 333 pmo->pmo_mountflags = (uint32_t)mountflags; 334 pmo->pmo_data_len = data ? (uint32_t)strlen(data) + 1 : 0; 335 pmo->pmo_sock_len = (uint32_t)sock_len; 336 337 cp = (char *)(void *)(pmo + 1); 338 339 if (source) { 340 (void)strcpy(cp, source); 341 cp += pmo->pmo_source_len; 342 } 343 344 if (target) { 345 (void)strcpy(cp, target); 346 cp += pmo->pmo_target_len; 347 } 348 349 if (filesystemtype) { 350 (void)strcpy(cp, filesystemtype); 351 cp += pmo->pmo_filesystemtype_len; 352 } 353 354 if (data) { 355 (void)strcpy(cp, data); 356 cp += pmo->pmo_data_len; 357 } 358 359 if (sock_len != 0) { 360 (void)strcpy(cp, sun->sun_path); 361 cp += pmo->pmo_sock_len; 362 } 363 364 if (send(s, frame, len, MSG_NOSIGNAL) != (ssize_t)len) { 365 #ifdef PERFUSE_DEBUG 366 DWARN("%s:%d sendto failed", __func__, __LINE__); 367 #endif 368 return -1; 369 } 370 371 return 0; 372 } 373 374 375 uint64_t 376 perfuse_next_unique(pu) 377 struct puffs_usermount *pu; 378 { 379 struct perfuse_state *ps; 380 381 ps = puffs_getspecific(pu); 382 383 return ps->ps_unique++; 384 } 385 386 struct puffs_usermount * 387 perfuse_init(pc, pmi) 388 struct perfuse_callbacks *pc; 389 struct perfuse_mount_info *pmi; 390 { 391 struct perfuse_state *ps; 392 struct puffs_usermount *pu; 393 struct puffs_ops *pops; 394 const char *source = _PATH_PUFFS; 395 char *fstype; 396 unsigned int puffs_flags; 397 struct puffs_node *pn_root; 398 struct puffs_pathobj *po_root; 399 400 ps = init_state(); 401 ps->ps_owner_uid = pmi->pmi_uid; 402 403 if (pmi->pmi_source) { 404 if ((ps->ps_source = strdup(pmi->pmi_source)) == NULL) 405 DERR(EX_OSERR, "strdup failed"); 406 407 source = ps->ps_source; 408 } 409 410 if (pmi->pmi_filesystemtype) { 411 size_t len; 412 413 ps->ps_filesystemtype = strdup(pmi->pmi_filesystemtype); 414 if (ps->ps_filesystemtype == NULL) 415 DERR(EX_OSERR, "strdup failed"); 416 417 len = sizeof("perfuse|") + strlen(ps->ps_filesystemtype) + 1; 418 if ((fstype = malloc(len)) == NULL) 419 DERR(EX_OSERR, "malloc failed"); 420 421 (void)sprintf(fstype, "perfuse|%s", ps->ps_filesystemtype); 422 } else { 423 if ((fstype = strdup("perfuse")) == NULL) 424 DERR(EX_OSERR, "strdup failed"); 425 } 426 427 if ((ps->ps_target = strdup(pmi->pmi_target)) == NULL) 428 DERR(EX_OSERR, "strdup failed"); 429 430 ps->ps_mountflags = pmi->pmi_mountflags; 431 432 /* 433 * Some options are forbidden for non root users 434 */ 435 if (ps->ps_owner_uid != 0) 436 ps->ps_mountflags |= MNT_NOSUID|MNT_NODEV; 437 438 PUFFSOP_INIT(pops); 439 PUFFSOP_SET(pops, perfuse, fs, unmount); 440 PUFFSOP_SET(pops, perfuse, fs, statvfs); 441 PUFFSOP_SET(pops, perfuse, fs, sync); 442 PUFFSOP_SET(pops, perfuse, node, lookup); 443 PUFFSOP_SET(pops, perfuse, node, create); 444 PUFFSOP_SET(pops, perfuse, node, mknod); 445 PUFFSOP_SET(pops, perfuse, node, open); 446 PUFFSOP_SET(pops, perfuse, node, close); 447 PUFFSOP_SET(pops, perfuse, node, access); 448 PUFFSOP_SET(pops, perfuse, node, getattr); 449 PUFFSOP_SET(pops, perfuse, node, setattr); 450 PUFFSOP_SET(pops, perfuse, node, poll); 451 #if 0 452 PUFFSOP_SET(pops, perfuse, node, mmap); 453 #endif 454 PUFFSOP_SET(pops, perfuse, node, fsync); 455 PUFFSOP_SET(pops, perfuse, node, seek); 456 PUFFSOP_SET(pops, perfuse, node, remove); 457 PUFFSOP_SET(pops, perfuse, node, link); 458 PUFFSOP_SET(pops, perfuse, node, rename); 459 PUFFSOP_SET(pops, perfuse, node, mkdir); 460 PUFFSOP_SET(pops, perfuse, node, rmdir); 461 PUFFSOP_SET(pops, perfuse, node, symlink); 462 PUFFSOP_SET(pops, perfuse, node, readdir); 463 PUFFSOP_SET(pops, perfuse, node, readlink); 464 PUFFSOP_SET(pops, perfuse, node, reclaim); 465 PUFFSOP_SET(pops, perfuse, node, inactive); 466 PUFFSOP_SET(pops, perfuse, node, print); 467 PUFFSOP_SET(pops, perfuse, node, advlock); 468 PUFFSOP_SET(pops, perfuse, node, read); 469 PUFFSOP_SET(pops, perfuse, node, write); 470 471 puffs_flags = PUFFS_KFLAG_WTCACHE; 472 473 if (perfuse_diagflags & PDF_PUFFS) 474 puffs_flags |= PUFFS_FLAG_OPDUMP; 475 476 if ((pu = puffs_init(pops, source, fstype, ps, puffs_flags)) == NULL) 477 DERR(EX_OSERR, "puffs_init failed"); 478 479 ps->ps_pu = pu; 480 481 /* 482 * Setup filesystem root 483 */ 484 pn_root = perfuse_new_pn(pu, "", NULL); 485 PERFUSE_NODE_DATA(pn_root)->pnd_ino = FUSE_ROOT_ID; 486 PERFUSE_NODE_DATA(pn_root)->pnd_parent = pn_root; 487 puffs_setroot(pu, pn_root); 488 ps->ps_fsid = pn_root->pn_va.va_fsid; 489 490 po_root = puffs_getrootpathobj(pu); 491 if ((po_root->po_path = strdup("/")) == NULL) 492 DERRX(EX_OSERR, "perfuse_mount_start() failed"); 493 494 po_root->po_len = 1; 495 puffs_path_buildhash(pu, po_root); 496 497 puffs_vattr_null(&pn_root->pn_va); 498 pn_root->pn_va.va_type = VDIR; 499 pn_root->pn_va.va_mode = 0755; 500 501 ps->ps_root = pn_root; 502 503 /* 504 * Callbacks 505 */ 506 ps->ps_new_msg = pc->pc_new_msg; 507 ps->ps_xchg_msg = pc->pc_xchg_msg; 508 ps->ps_destroy_msg = pc->pc_destroy_msg; 509 ps->ps_get_inhdr = pc->pc_get_inhdr; 510 ps->ps_get_inpayload = pc->pc_get_inpayload; 511 ps->ps_get_outhdr = pc->pc_get_outhdr; 512 ps->ps_get_outpayload = pc->pc_get_outpayload; 513 514 return pu; 515 } 516 517 void 518 perfuse_setspecific(pu, priv) 519 struct puffs_usermount *pu; 520 void *priv; 521 { 522 struct perfuse_state *ps; 523 524 ps = puffs_getspecific(pu); 525 ps->ps_private = priv; 526 527 return; 528 } 529 530 void * 531 perfuse_getspecific(pu) 532 struct puffs_usermount *pu; 533 { 534 struct perfuse_state *ps; 535 536 ps = puffs_getspecific(pu); 537 538 return ps->ps_private; 539 } 540 541 int 542 perfuse_inloop(pu) 543 struct puffs_usermount *pu; 544 { 545 struct perfuse_state *ps; 546 547 ps = puffs_getspecific(pu); 548 549 return ps->ps_flags & PS_INLOOP; 550 } 551 552 int 553 perfuse_mainloop(pu) 554 struct puffs_usermount *pu; 555 { 556 struct perfuse_state *ps; 557 558 ps = puffs_getspecific(pu); 559 560 ps->ps_flags |= PS_INLOOP; 561 if (puffs_mainloop(ps->ps_pu) != 0) 562 DERR(EX_OSERR, "puffs_mainloop failed"); 563 DERR(EX_OSERR, "puffs_mainloop exit"); 564 565 /* NOTREACHED */ 566 return -1; 567 } 568 569 /* ARGSUSED0 */ 570 uint64_t 571 perfuse_get_ino(pu, opc) 572 struct puffs_usermount *pu; 573 puffs_cookie_t opc; 574 { 575 return PERFUSE_NODE_DATA(opc)->pnd_ino; 576 } 577 578 int 579 perfuse_unmount(pu) 580 struct puffs_usermount *pu; 581 { 582 struct perfuse_state *ps; 583 584 ps = puffs_getspecific(pu); 585 586 return unmount(ps->ps_target, MNT_FORCE); 587 } 588
Indexes created Sun Sep 21 20:09:37 GMT 2025