| 1 |
#define _GNU_SOURCE |
| 2 |
|
| 3 |
#include <lufs/fs.h> |
| 4 |
#include <lufs/proto.h> |
| 5 |
#include <fuse.h> |
| 6 |
#include "list.h" |
| 7 |
#include "dircache.h" |
| 8 |
#include <stdio.h> |
| 9 |
#include <stdlib.h> |
| 10 |
#include <string.h> |
| 11 |
#include <dlfcn.h> |
| 12 |
#include <fcntl.h> |
| 13 |
#include <unistd.h> |
| 14 |
#include <errno.h> |
| 15 |
#include <sys/vfs.h> |
| 16 |
|
| 17 |
/* statfs extension for captivefs */ |
| 18 |
struct lufs_sbattr_ { /* struct statfs64 */ |
| 19 |
unsigned long long sb_bytes; |
| 20 |
unsigned long long sb_bytes_free; |
| 21 |
unsigned long long sb_bytes_available; |
| 22 |
unsigned long long sb_files; |
| 23 |
unsigned long long sb_ffree; |
| 24 |
}; |
| 25 |
|
| 26 |
struct fs_operations { |
| 27 |
void *(*init)(struct list_head*, struct dir_cache*, struct credentials*, void**); |
| 28 |
void (*free)(void*); |
| 29 |
int (*mount)(void*); |
| 30 |
void (*umount)(void*); |
| 31 |
int (*readdir)(void*, char*, struct directory*); |
| 32 |
int (*stat)(void*, char*, struct lufs_fattr*); |
| 33 |
int (*mkdir)(void*, char*, int); |
| 34 |
int (*rmdir)(void*, char*); |
| 35 |
int (*create)(void*, char*, int); |
| 36 |
int (*unlink)(void*, char*); |
| 37 |
int (*rename)(void*, char*, char*); |
| 38 |
int (*open)(void*, char*, unsigned); |
| 39 |
int (*release)(void*, char*); |
| 40 |
int (*read)(void*, char*, long long, unsigned long, char*); |
| 41 |
int (*write)(void*, char*, long long, unsigned long, char*); |
| 42 |
int (*readlink)(void*, char*, char*, int); |
| 43 |
int (*link)(void*, char*, char*); |
| 44 |
int (*symlink)(void*, char*, char*); |
| 45 |
int (*setattr)(void*, char*, struct lufs_fattr*); |
| 46 |
int (*statfs)(void*, struct lufs_sbattr_*); |
| 47 |
}; |
| 48 |
|
| 49 |
static struct fs_operations lu_fops; |
| 50 |
static void *lu_dlhandle; |
| 51 |
static struct list_head lu_cfg; |
| 52 |
static void *lu_global_ctx; |
| 53 |
static struct credentials lu_cred; |
| 54 |
static void *lu_context; |
| 55 |
static struct dir_cache *lu_cache; |
| 56 |
|
| 57 |
#define BUF_SIZE 1024 |
| 58 |
#define PASSWD "/etc/passwd" |
| 59 |
#define GROUP "/etc/group" |
| 60 |
|
| 61 |
int lu_check_to(int rd_fd, int wr_fd, int time_out){ |
| 62 |
fd_set rd, wr; |
| 63 |
int res, maxfd = 0; |
| 64 |
struct timeval tv; |
| 65 |
|
| 66 |
FD_ZERO(&rd); |
| 67 |
FD_ZERO(&wr); |
| 68 |
|
| 69 |
if(rd_fd){ |
| 70 |
FD_SET(rd_fd, &rd); |
| 71 |
maxfd = rd_fd > maxfd ? rd_fd : maxfd; |
| 72 |
} |
| 73 |
|
| 74 |
if(wr_fd){ |
| 75 |
FD_SET(wr_fd, &wr); |
| 76 |
maxfd = wr_fd > maxfd ? wr_fd : maxfd; |
| 77 |
} |
| 78 |
|
| 79 |
tv.tv_sec = time_out; |
| 80 |
tv.tv_usec = 0; |
| 81 |
|
| 82 |
do{ |
| 83 |
res = select(maxfd + 1, &rd, &wr, NULL, &tv); |
| 84 |
|
| 85 |
}while((res < 0) && (errno == EINTR)); |
| 86 |
|
| 87 |
if(res > 0) |
| 88 |
return 0; |
| 89 |
|
| 90 |
if(res < 0){ |
| 91 |
WARN("select call failed: %s", strerror(errno)); |
| 92 |
return -errno; |
| 93 |
} |
| 94 |
|
| 95 |
WARN("operation timed out!"); |
| 96 |
|
| 97 |
return -ETIMEDOUT; |
| 98 |
} |
| 99 |
|
| 100 |
int lu_atomic_read(int fd, char *buf, int len, int time_out){ |
| 101 |
int res, offset = 0; |
| 102 |
|
| 103 |
do{ |
| 104 |
if((time_out) && ((res = lu_check_to(fd, 0, time_out)) < 0)) |
| 105 |
return res; |
| 106 |
|
| 107 |
do{ |
| 108 |
res = read(fd, buf + offset, len - offset); |
| 109 |
}while((res < 0) && (errno == EINTR)); |
| 110 |
|
| 111 |
if(res <= 0){ |
| 112 |
WARN("read call failed: %s", strerror(errno)); |
| 113 |
return (res < 0) ? -errno : (offset > 0 ? offset : -EPIPE); |
| 114 |
} |
| 115 |
|
| 116 |
offset += res; |
| 117 |
|
| 118 |
}while(offset < len); |
| 119 |
|
| 120 |
return offset; |
| 121 |
} |
| 122 |
|
| 123 |
int lu_atomic_write(int fd, char *buf, int len, int time_out){ |
| 124 |
int res, offset = 0; |
| 125 |
|
| 126 |
do{ |
| 127 |
if((time_out) && ((res = lu_check_to(0, fd, time_out)) < 0)) |
| 128 |
return res; |
| 129 |
|
| 130 |
do{ |
| 131 |
res = write(fd, buf + offset, len - offset); |
| 132 |
}while((res < 0) && (errno == EINTR)); |
| 133 |
|
| 134 |
if(res <= 0){ |
| 135 |
WARN("write call failed: %s", strerror(errno)); |
| 136 |
return (res < 0) ? -errno : (offset > 0 ? offset : -EPIPE); |
| 137 |
} |
| 138 |
|
| 139 |
offset += res; |
| 140 |
|
| 141 |
}while(offset < len); |
| 142 |
|
| 143 |
return offset; |
| 144 |
} |
| 145 |
|
| 146 |
static int get_filesystem(const char *fs) |
| 147 |
{ |
| 148 |
char *buf; |
| 149 |
void *dlhandle; |
| 150 |
|
| 151 |
if(!(buf = (char*)malloc(strlen(fs) + 32))) |
| 152 |
return -1; |
| 153 |
|
| 154 |
sprintf(buf, "liblufs-%s.so", fs); |
| 155 |
if(!(dlhandle = dlopen(buf, RTLD_LAZY))){ |
| 156 |
ERROR(dlerror()); |
| 157 |
goto fail; |
| 158 |
} |
| 159 |
|
| 160 |
sprintf(buf, "%s_init", fs); |
| 161 |
if(!(lu_fops.init = (void*(*)(struct list_head*, struct dir_cache*, struct credentials*, void**))dlsym(dlhandle, buf))){ |
| 162 |
ERROR(dlerror()); |
| 163 |
goto fail_fops; |
| 164 |
} |
| 165 |
|
| 166 |
sprintf(buf, "%s_free", fs); |
| 167 |
if(!(lu_fops.free = (void(*)(void*))dlsym(dlhandle, buf))){ |
| 168 |
ERROR(dlerror()); |
| 169 |
goto fail_fops; |
| 170 |
} |
| 171 |
|
| 172 |
sprintf(buf, "%s_mount", fs); |
| 173 |
if(!(lu_fops.mount = (int(*)(void*))dlsym(dlhandle, buf))){ |
| 174 |
ERROR(dlerror()); |
| 175 |
goto fail_fops; |
| 176 |
} |
| 177 |
|
| 178 |
sprintf(buf, "%s_umount", fs); |
| 179 |
if(!(lu_fops.umount = (void(*)(void*))dlsym(dlhandle, buf))) |
| 180 |
ERROR(dlerror()); |
| 181 |
|
| 182 |
sprintf(buf, "%s_readdir", fs); |
| 183 |
if(!(lu_fops.readdir = (int(*)(void*, char*, struct directory*))dlsym(dlhandle, buf))) |
| 184 |
ERROR(dlerror()); |
| 185 |
|
| 186 |
sprintf(buf, "%s_stat", fs); |
| 187 |
if(!(lu_fops.stat = (int(*)(void*, char*, struct lufs_fattr*))dlsym(dlhandle, buf))) |
| 188 |
ERROR(dlerror()); |
| 189 |
|
| 190 |
sprintf(buf, "%s_mkdir", fs); |
| 191 |
if(!(lu_fops.mkdir = (int(*)(void*, char*, int))dlsym(dlhandle, buf))) |
| 192 |
ERROR(dlerror()); |
| 193 |
|
| 194 |
sprintf(buf, "%s_rmdir", fs); |
| 195 |
if(!(lu_fops.rmdir = (int(*)(void*, char*))dlsym(dlhandle, buf))) |
| 196 |
ERROR(dlerror()); |
| 197 |
|
| 198 |
sprintf(buf, "%s_create", fs); |
| 199 |
if(!(lu_fops.create = (int(*)(void*, char*, int))dlsym(dlhandle, buf))) |
| 200 |
ERROR(dlerror()); |
| 201 |
|
| 202 |
sprintf(buf, "%s_unlink", fs); |
| 203 |
if(!(lu_fops.unlink = (int(*)(void*, char*))dlsym(dlhandle, buf))) |
| 204 |
ERROR(dlerror()); |
| 205 |
|
| 206 |
sprintf(buf, "%s_rename", fs); |
| 207 |
if(!(lu_fops.rename = (int(*)(void*, char*, char*))dlsym(dlhandle, buf))) |
| 208 |
ERROR(dlerror()); |
| 209 |
|
| 210 |
sprintf(buf, "%s_open", fs); |
| 211 |
if(!(lu_fops.open = (int(*)(void*, char*, unsigned))dlsym(dlhandle, buf))) |
| 212 |
ERROR(dlerror()); |
| 213 |
|
| 214 |
sprintf(buf, "%s_release", fs); |
| 215 |
if(!(lu_fops.release = (int(*)(void*, char*))dlsym(dlhandle, buf))) |
| 216 |
ERROR(dlerror()); |
| 217 |
|
| 218 |
sprintf(buf, "%s_read", fs); |
| 219 |
if(!(lu_fops.read = (int(*)(void*, char*, long long, unsigned long, char*))dlsym(dlhandle, buf))) |
| 220 |
ERROR(dlerror()); |
| 221 |
|
| 222 |
sprintf(buf, "%s_write", fs); |
| 223 |
if(!(lu_fops.write = (int(*)(void*, char*, long long, unsigned long, char*))dlsym(dlhandle, buf))) |
| 224 |
ERROR(dlerror()); |
| 225 |
|
| 226 |
sprintf(buf, "%s_readlink", fs); |
| 227 |
if(!(lu_fops.readlink = (int(*)(void*, char*, char*, int))dlsym(dlhandle, buf))) |
| 228 |
ERROR(dlerror()); |
| 229 |
|
| 230 |
sprintf(buf, "%s_link", fs); |
| 231 |
if(!(lu_fops.link = (int(*)(void*, char*, char*))dlsym(dlhandle, buf))) |
| 232 |
ERROR(dlerror()); |
| 233 |
|
| 234 |
sprintf(buf, "%s_symlink", fs); |
| 235 |
if(!(lu_fops.symlink = (int(*)(void*, char*, char*))dlsym(dlhandle, buf))) |
| 236 |
ERROR(dlerror()); |
| 237 |
|
| 238 |
sprintf(buf, "%s_setattr", fs); |
| 239 |
if(!(lu_fops.setattr = (int(*)(void*, char*, struct lufs_fattr*))dlsym(dlhandle, buf))) |
| 240 |
ERROR(dlerror()); |
| 241 |
sprintf(buf, "%s_statfs", fs); |
| 242 |
lu_fops.statfs = (int(*)(void*, struct lufs_sbattr_*))dlsym(dlhandle, buf); |
| 243 |
|
| 244 |
lu_dlhandle = dlhandle; |
| 245 |
free(buf); |
| 246 |
return 0; |
| 247 |
|
| 248 |
fail_fops: |
| 249 |
dlclose(dlhandle); |
| 250 |
fail: |
| 251 |
free(buf); |
| 252 |
return -1; |
| 253 |
} |
| 254 |
|
| 255 |
static int lu_getattr_native(const char *path, struct lufs_fattr *fattr) |
| 256 |
{ |
| 257 |
if(!lu_fops.stat) |
| 258 |
return -ENOSYS; |
| 259 |
|
| 260 |
memset(fattr, 0, sizeof(struct lufs_fattr)); |
| 261 |
if(lu_cache_lookup_file(lu_cache, (char *) path, fattr, NULL, 0) < 0) { |
| 262 |
if(lu_fops.stat(lu_context, (char *) path, fattr) < 0) |
| 263 |
return -ENOENT; |
| 264 |
} |
| 265 |
return 0; |
| 266 |
} |
| 267 |
|
| 268 |
static int lu_getattr(const char *path, struct stat *stbuf) |
| 269 |
{ |
| 270 |
struct lufs_fattr fattr; |
| 271 |
int res; |
| 272 |
|
| 273 |
res = lu_getattr_native(path, &fattr); |
| 274 |
if(res < 0) |
| 275 |
return res; |
| 276 |
|
| 277 |
stbuf->st_mode = fattr.f_mode; |
| 278 |
stbuf->st_nlink = fattr.f_nlink; |
| 279 |
stbuf->st_uid = fattr.f_uid; |
| 280 |
stbuf->st_gid = fattr.f_gid; |
| 281 |
stbuf->st_size = fattr.f_size; |
| 282 |
stbuf->st_atime = fattr.f_atime; |
| 283 |
stbuf->st_mtime = fattr.f_mtime; |
| 284 |
stbuf->st_ctime = fattr.f_ctime; |
| 285 |
stbuf->st_blksize = fattr.f_blksize; |
| 286 |
stbuf->st_blocks = fattr.f_blocks; |
| 287 |
|
| 288 |
return 0; |
| 289 |
} |
| 290 |
|
| 291 |
static int lu_readlink(const char *path, char *buf, size_t size) |
| 292 |
{ |
| 293 |
int len; |
| 294 |
struct lufs_fattr fattr; |
| 295 |
|
| 296 |
if(!lu_fops.readlink) |
| 297 |
return -ENOSYS; |
| 298 |
|
| 299 |
if(lu_cache_lookup_file(lu_cache, (char *) path, &fattr, buf, size) < 0 || |
| 300 |
strcmp(buf, "") == 0) { |
| 301 |
if((len = lu_fops.readlink(lu_context, (char *) path, buf, size)) < 0) |
| 302 |
return -EPERM; |
| 303 |
|
| 304 |
/* FUSE leaves one extra char free at the end */ |
| 305 |
buf[len] = '\0'; |
| 306 |
} |
| 307 |
|
| 308 |
return 0; |
| 309 |
} |
| 310 |
|
| 311 |
static int lu_getdir(const char *path, fuse_dirh_t h, fuse_dirfil_t filler) |
| 312 |
{ |
| 313 |
struct directory *dir; |
| 314 |
|
| 315 |
if(!lu_fops.readdir) |
| 316 |
return -ENOSYS; |
| 317 |
|
| 318 |
if(lu_cache_readdir(lu_cache, (char *) path, h, filler) < 0){ |
| 319 |
if(!(dir = lu_cache_mkdir((char *) path))) |
| 320 |
return -1; |
| 321 |
|
| 322 |
if(lu_fops.readdir(lu_context, (char *) path, dir) < 0){ |
| 323 |
lu_cache_killdir(dir); |
| 324 |
return -1; |
| 325 |
} |
| 326 |
lu_cache_add_dir(lu_cache, dir); |
| 327 |
|
| 328 |
if(lu_cache_readdir(lu_cache, (char *) path, h, filler) < 0) { |
| 329 |
return -EPERM; |
| 330 |
} |
| 331 |
} |
| 332 |
return 0; |
| 333 |
} |
| 334 |
|
| 335 |
static int lu_mknod(const char *path, mode_t mode, dev_t rdev) |
| 336 |
{ |
| 337 |
(void) rdev; |
| 338 |
if(!S_ISREG(mode) || !lu_fops.create) |
| 339 |
return -ENOSYS; |
| 340 |
|
| 341 |
if(lu_fops.create(lu_context, (char *) path, mode) < 0) |
| 342 |
return -EPERM; |
| 343 |
|
| 344 |
lu_cache_invalidate(lu_cache, (char *) path); |
| 345 |
return 0; |
| 346 |
} |
| 347 |
|
| 348 |
static int lu_mkdir(const char *path, mode_t mode) |
| 349 |
{ |
| 350 |
if(!lu_fops.mkdir) |
| 351 |
return -ENOSYS; |
| 352 |
|
| 353 |
if(lu_fops.mkdir(lu_context, (char *) path, mode) < 0) |
| 354 |
return -EPERM; |
| 355 |
|
| 356 |
lu_cache_invalidate(lu_cache, (char *) path); |
| 357 |
return 0; |
| 358 |
} |
| 359 |
|
| 360 |
static int lu_unlink(const char *path) |
| 361 |
{ |
| 362 |
if(!lu_fops.unlink) |
| 363 |
return -ENOSYS; |
| 364 |
|
| 365 |
if(lu_fops.unlink(lu_context, (char *) path) < 0) |
| 366 |
return -EPERM; |
| 367 |
|
| 368 |
lu_cache_invalidate(lu_cache, (char *) path); |
| 369 |
return 0; |
| 370 |
} |
| 371 |
|
| 372 |
static int lu_rmdir(const char *path) |
| 373 |
{ |
| 374 |
if(!lu_fops.rmdir) |
| 375 |
return -ENOSYS; |
| 376 |
|
| 377 |
if(lu_fops.rmdir(lu_context, (char *) path) < 0) |
| 378 |
return -EPERM; |
| 379 |
|
| 380 |
lu_cache_invalidate(lu_cache, (char *) path); |
| 381 |
return 0; |
| 382 |
} |
| 383 |
|
| 384 |
static int lu_symlink(const char *from, const char *to) |
| 385 |
{ |
| 386 |
if(!lu_fops.symlink) |
| 387 |
return -ENOSYS; |
| 388 |
|
| 389 |
if(lu_fops.symlink(lu_context, (char *) from, (char *) to) < 0) |
| 390 |
return -EPERM; |
| 391 |
|
| 392 |
lu_cache_invalidate(lu_cache, (char *) to); |
| 393 |
return 0; |
| 394 |
} |
| 395 |
|
| 396 |
static int lu_rename(const char *from, const char *to) |
| 397 |
{ |
| 398 |
if(!lu_fops.rename) |
| 399 |
return -ENOSYS; |
| 400 |
|
| 401 |
if(lu_fops.rename(lu_context, (char *) from, (char *) to) < 0) |
| 402 |
return -EPERM; |
| 403 |
|
| 404 |
lu_cache_invalidate(lu_cache, (char *) from); |
| 405 |
lu_cache_invalidate(lu_cache, (char *) to); |
| 406 |
return 0; |
| 407 |
} |
| 408 |
|
| 409 |
static int lu_link(const char *from, const char *to) |
| 410 |
{ |
| 411 |
if(!lu_fops.link) |
| 412 |
return -ENOSYS; |
| 413 |
|
| 414 |
if(lu_fops.link(lu_context, (char *) from, (char *) to) < 0) |
| 415 |
return -EPERM; |
| 416 |
|
| 417 |
lu_cache_invalidate(lu_cache, (char *) from); |
| 418 |
lu_cache_invalidate(lu_cache, (char *) to); |
| 419 |
return 0; |
| 420 |
} |
| 421 |
|
| 422 |
static int lu_chmod(const char *path, mode_t mode) |
| 423 |
{ |
| 424 |
int res; |
| 425 |
struct lufs_fattr fattr; |
| 426 |
|
| 427 |
if(!lu_fops.setattr) |
| 428 |
return -ENOSYS; |
| 429 |
|
| 430 |
res = lu_getattr_native(path, &fattr); |
| 431 |
if(res < 0) |
| 432 |
return res; |
| 433 |
|
| 434 |
fattr.f_mode = mode; |
| 435 |
if(lu_fops.setattr(lu_context, (char *) path, &fattr) < 0) |
| 436 |
return -EPERM; |
| 437 |
|
| 438 |
lu_cache_invalidate(lu_cache, (char *) path); |
| 439 |
return 0; |
| 440 |
} |
| 441 |
|
| 442 |
static int lu_chown(const char *path, uid_t uid, gid_t gid) |
| 443 |
{ |
| 444 |
int res; |
| 445 |
struct lufs_fattr fattr; |
| 446 |
|
| 447 |
if(!lu_fops.setattr) |
| 448 |
return -ENOSYS; |
| 449 |
|
| 450 |
res = lu_getattr_native(path, &fattr); |
| 451 |
if(res < 0) |
| 452 |
return res; |
| 453 |
|
| 454 |
if(uid != (uid_t) -1) |
| 455 |
fattr.f_uid = uid; |
| 456 |
if(gid != (gid_t) -1) |
| 457 |
fattr.f_gid = gid; |
| 458 |
if(lu_fops.setattr(lu_context, (char *) path, &fattr) < 0) |
| 459 |
return -EPERM; |
| 460 |
|
| 461 |
lu_cache_invalidate(lu_cache, (char *) path); |
| 462 |
return 0; |
| 463 |
|
| 464 |
} |
| 465 |
|
| 466 |
static int lu_truncate(const char *path, off_t size) |
| 467 |
{ |
| 468 |
int res; |
| 469 |
struct lufs_fattr fattr; |
| 470 |
|
| 471 |
if(!lu_fops.setattr) |
| 472 |
return -ENOSYS; |
| 473 |
|
| 474 |
res = lu_getattr_native(path, &fattr); |
| 475 |
if(res < 0) |
| 476 |
return res; |
| 477 |
|
| 478 |
fattr.f_size = size; |
| 479 |
if(lu_fops.setattr(lu_context, (char *) path, &fattr) < 0) |
| 480 |
return -EPERM; |
| 481 |
|
| 482 |
lu_cache_invalidate(lu_cache, (char *) path); |
| 483 |
return 0; |
| 484 |
} |
| 485 |
|
| 486 |
static int lu_utime(const char *path, struct utimbuf *buf) |
| 487 |
{ |
| 488 |
int res; |
| 489 |
struct lufs_fattr fattr; |
| 490 |
|
| 491 |
if(!lu_fops.setattr) |
| 492 |
return -ENOSYS; |
| 493 |
|
| 494 |
res = lu_getattr_native(path, &fattr); |
| 495 |
if(res < 0) |
| 496 |
return res; |
| 497 |
|
| 498 |
fattr.f_atime = buf->actime; |
| 499 |
fattr.f_mtime = buf->modtime; |
| 500 |
if(lu_fops.setattr(lu_context, (char *) path, &fattr) < 0) |
| 501 |
return -EPERM; |
| 502 |
|
| 503 |
lu_cache_invalidate(lu_cache, (char *) path); |
| 504 |
return 0; |
| 505 |
} |
| 506 |
|
| 507 |
|
| 508 |
static int lu_open(const char *path, int flags) |
| 509 |
{ |
| 510 |
if(!lu_fops.open) |
| 511 |
return -ENOSYS; |
| 512 |
|
| 513 |
if(lu_fops.open(lu_context, (char *) path, flags & O_ACCMODE) < 0) |
| 514 |
return -EPERM; |
| 515 |
|
| 516 |
return 0; |
| 517 |
} |
| 518 |
|
| 519 |
static int lu_read(const char *path, char *buf, size_t size, off_t offset) |
| 520 |
{ |
| 521 |
int res; |
| 522 |
if(!lu_fops.read) |
| 523 |
return -ENOSYS; |
| 524 |
|
| 525 |
if((res = lu_fops.read(lu_context, (char *) path, offset, size, buf)) < 0) |
| 526 |
return -EPERM; |
| 527 |
|
| 528 |
return res; |
| 529 |
} |
| 530 |
|
| 531 |
static int lu_write(const char *path, const char *buf, size_t size, |
| 532 |
off_t offset) |
| 533 |
{ |
| 534 |
if(!lu_fops.write) |
| 535 |
return -ENOSYS; |
| 536 |
|
| 537 |
if(lu_fops.write(lu_context, (char *) path, offset, size, (char *) buf) < 0) |
| 538 |
return -EPERM; |
| 539 |
|
| 540 |
return size; |
| 541 |
} |
| 542 |
|
| 543 |
static int lu_release(const char *path, int flags) |
| 544 |
{ |
| 545 |
(void) flags; |
| 546 |
if(!lu_fops.release) |
| 547 |
return -ENOSYS; |
| 548 |
|
| 549 |
if(lu_fops.release(lu_context, (char *) path) < 0) |
| 550 |
return -EPERM; |
| 551 |
|
| 552 |
return 0; |
| 553 |
} |
| 554 |
|
| 555 |
#if FUSE_MAJOR_VERSION < 2 |
| 556 |
static int lu_statfs(struct fuse_statfs *stbuf) |
| 557 |
#else |
| 558 |
static int lu_statfs(const char *path, struct statfs *stbuf) |
| 559 |
#endif |
| 560 |
{ |
| 561 |
struct lufs_sbattr_ sbattr; |
| 562 |
|
| 563 |
memset(&sbattr, 0, sizeof(sbattr)); |
| 564 |
if(lu_fops.statfs) { |
| 565 |
if(lu_fops.statfs(lu_context, &sbattr) < 0) |
| 566 |
return -EPERM; |
| 567 |
} |
| 568 |
|
| 569 |
#if FUSE_MAJOR_VERSION < 2 |
| 570 |
stbuf->blocks = sbattr.sb_bytes / 512; |
| 571 |
stbuf->blocks_free = sbattr.sb_bytes_available / 512; |
| 572 |
stbuf->files = sbattr.sb_files; |
| 573 |
stbuf->files_free = sbattr.sb_ffree; |
| 574 |
stbuf->namelen = 255; |
| 575 |
#else |
| 576 |
(void) path; |
| 577 |
stbuf->f_bsize = 512; |
| 578 |
stbuf->f_blocks = sbattr.sb_bytes / 512; |
| 579 |
stbuf->f_bfree = sbattr.sb_bytes_free / 512; |
| 580 |
stbuf->f_bavail = sbattr.sb_bytes_available / 512; |
| 581 |
stbuf->f_files = sbattr.sb_files; |
| 582 |
stbuf->f_ffree = sbattr.sb_ffree; |
| 583 |
stbuf->f_namelen = 255; |
| 584 |
#endif |
| 585 |
return 0; |
| 586 |
} |
| 587 |
|
| 588 |
static int load_credentials(void) |
| 589 |
{ |
| 590 |
static char buf[BUF_SIZE]; |
| 591 |
char srch_str[MAX_LEN + 4]; |
| 592 |
long int uid, gid; |
| 593 |
int res, offset, chunk, readlen; |
| 594 |
char *c; |
| 595 |
|
| 596 |
TRACE("loading remote credentials for %s", lu_cred.user); |
| 597 |
|
| 598 |
if((!lu_fops.open) || (!lu_fops.read) || (!lu_fops.release)){ |
| 599 |
WARN("unsupported operation"); |
| 600 |
return -1;; |
| 601 |
} |
| 602 |
|
| 603 |
lu_cred.uid = lu_cred.gid = -1; |
| 604 |
|
| 605 |
if(lu_fops.open(lu_context, PASSWD, O_RDONLY) < 0){ |
| 606 |
TRACE("could not open %s", PASSWD); |
| 607 |
return -1; |
| 608 |
} |
| 609 |
|
| 610 |
sprintf(srch_str, "\n%s:", lu_cred.user); |
| 611 |
chunk = strlen(srch_str) + 64; |
| 612 |
readlen = BUF_SIZE - chunk - 1; |
| 613 |
|
| 614 |
memset(buf, 32, chunk); |
| 615 |
offset = 0; |
| 616 |
|
| 617 |
do{ |
| 618 |
res = lu_fops.read(lu_context, PASSWD, offset, readlen, (buf + chunk)); |
| 619 |
if(res > 0){ |
| 620 |
*(buf + chunk + res) = 0; |
| 621 |
|
| 622 |
if((c = strstr(buf, srch_str))){ |
| 623 |
TRACE("username found!"); |
| 624 |
if(!(c = strchr(c + strlen(srch_str), ':'))){ |
| 625 |
TRACE("separator not found!"); |
| 626 |
}else{ |
| 627 |
if(sscanf(c , ":%li:%li:", &uid, &gid) != 2){ |
| 628 |
TRACE("uid/gid not found!"); |
| 629 |
}else{ |
| 630 |
TRACE("uid: %li, gid: %li", uid, gid); |
| 631 |
|
| 632 |
lu_cred.uid = uid; |
| 633 |
lu_cred.gid = gid; |
| 634 |
|
| 635 |
break; |
| 636 |
} |
| 637 |
} |
| 638 |
} |
| 639 |
|
| 640 |
memcpy(buf, buf + BUF_SIZE - chunk - 1, chunk); |
| 641 |
offset += res; |
| 642 |
} |
| 643 |
}while(res == readlen); |
| 644 |
|
| 645 |
lu_fops.release(lu_context, PASSWD); |
| 646 |
|
| 647 |
if(res <= 0){ |
| 648 |
TRACE("read failed"); |
| 649 |
return -1; |
| 650 |
} |
| 651 |
|
| 652 |
|
| 653 |
if(lu_fops.open(lu_context, GROUP, O_RDONLY) < 0){ |
| 654 |
TRACE("could not open %s", GROUP); |
| 655 |
return -1; |
| 656 |
} |
| 657 |
|
| 658 |
sprintf(srch_str, ":%li:", (long)lu_cred.gid); |
| 659 |
chunk = strlen(srch_str) + 64; |
| 660 |
readlen = BUF_SIZE - chunk - 1; |
| 661 |
|
| 662 |
memset(buf, 32, chunk); |
| 663 |
offset = 0; |
| 664 |
|
| 665 |
do{ |
| 666 |
res = lu_fops.read(lu_context, GROUP, offset, readlen, (buf + chunk)); |
| 667 |
if(res > 0){ |
| 668 |
*(buf + chunk + res) = 0; |
| 669 |
|
| 670 |
if((c = strstr(buf, srch_str))){ |
| 671 |
TRACE("group found!"); |
| 672 |
if(!(c = (char*)memrchr(buf, '\n', (c - buf)))){ |
| 673 |
TRACE("separator not found!"); |
| 674 |
}else{ |
| 675 |
*(strchr(c, ':')) = 0; |
| 676 |
if(strlen(c + 1) >= MAX_LEN){ |
| 677 |
TRACE("groupname too long"); |
| 678 |
}else{ |
| 679 |
strcpy(lu_cred.group, c + 1); |
| 680 |
TRACE("group: %s", lu_cred.group); |
| 681 |
break; |
| 682 |
} |
| 683 |
} |
| 684 |
} |
| 685 |
|
| 686 |
memcpy(buf, buf + BUF_SIZE - chunk - 1, chunk); |
| 687 |
offset += res; |
| 688 |
} |
| 689 |
}while(res == readlen); |
| 690 |
|
| 691 |
lu_fops.release(lu_context, GROUP); |
| 692 |
|
| 693 |
if(res <= 0){ |
| 694 |
TRACE("read failed"); |
| 695 |
return -1; |
| 696 |
} |
| 697 |
|
| 698 |
return 0; |
| 699 |
} |
| 700 |
|
| 701 |
static int lufis_init(int *argcp, char **argvp[]) |
| 702 |
{ |
| 703 |
int argc = *argcp; |
| 704 |
char **argv = *argvp; |
| 705 |
int res; |
| 706 |
char *opts; |
| 707 |
const char *fs_name; |
| 708 |
|
| 709 |
if(argc < 2) { |
| 710 |
fprintf(stderr, "usage: %s opts\n", argv[0]); |
| 711 |
return -1; |
| 712 |
} |
| 713 |
|
| 714 |
INIT_LIST_HEAD(&lu_cfg); |
| 715 |
opts = argv[1]; |
| 716 |
if(lu_opt_parse(&lu_cfg, "MOUNT", opts) < 0){ |
| 717 |
ERROR("could not parse options!"); |
| 718 |
return -1; |
| 719 |
} |
| 720 |
|
| 721 |
lu_opt_loadcfg(&lu_cfg, "/etc/lufsd.conf"); |
| 722 |
|
| 723 |
(*argcp)--; |
| 724 |
(*argvp)++; |
| 725 |
argv[1] = argv[0]; |
| 726 |
|
| 727 |
|
| 728 |
lu_cache = lu_cache_create(&lu_cfg); |
| 729 |
if(!lu_cache) |
| 730 |
return -1; |
| 731 |
|
| 732 |
if(!(fs_name = lu_opt_getchar(&lu_cfg, "MOUNT", "fs"))){ |
| 733 |
ERROR("you need to specify a file system!"); |
| 734 |
return -1; |
| 735 |
} |
| 736 |
|
| 737 |
res = get_filesystem(fs_name); |
| 738 |
if(res == -1) |
| 739 |
return -1; |
| 740 |
|
| 741 |
if(!(lu_context = lu_fops.init(&lu_cfg, lu_cache, &lu_cred, &lu_global_ctx))) { |
| 742 |
ERROR("could not initialize file system!"); |
| 743 |
return -1; |
| 744 |
} |
| 745 |
|
| 746 |
res = lu_fops.mount(lu_context); |
| 747 |
if(res) { |
| 748 |
if(load_credentials() < 0) |
| 749 |
TRACE("could not load credentials."); |
| 750 |
else |
| 751 |
TRACE("credentials loaded."); |
| 752 |
} else { |
| 753 |
WARN("fs mount failed..."); |
| 754 |
} |
| 755 |
|
| 756 |
return 0; |
| 757 |
} |
| 758 |
|
| 759 |
static void lufis_cleanup(void) |
| 760 |
{ |
| 761 |
if(lu_fops.umount) |
| 762 |
lu_fops.umount(lu_context); |
| 763 |
lu_fops.free(lu_context); |
| 764 |
} |
| 765 |
|
| 766 |
static struct fuse_operations lu_oper = { |
| 767 |
.getattr = lu_getattr, |
| 768 |
.readlink = lu_readlink, |
| 769 |
.getdir = lu_getdir, |
| 770 |
.mknod = lu_mknod, |
| 771 |
.mkdir = lu_mkdir, |
| 772 |
.symlink = lu_symlink, |
| 773 |
.unlink = lu_unlink, |
| 774 |
.rmdir = lu_rmdir, |
| 775 |
.rename = lu_rename, |
| 776 |
.link = lu_link, |
| 777 |
.chmod = lu_chmod, |
| 778 |
.chown = lu_chown, |
| 779 |
.truncate = lu_truncate, |
| 780 |
.utime = lu_utime, |
| 781 |
.open = lu_open, |
| 782 |
.read = lu_read, |
| 783 |
.write = lu_write, |
| 784 |
.release = lu_release, |
| 785 |
.statfs = lu_statfs, |
| 786 |
}; |
| 787 |
|
| 788 |
int main(int argc, char *argv[]) |
| 789 |
{ |
| 790 |
int res; |
| 791 |
|
| 792 |
res = lufis_init(&argc, &argv); |
| 793 |
if(res == -1) |
| 794 |
exit(1); |
| 795 |
|
| 796 |
fuse_main(argc, argv, &lu_oper); |
| 797 |
lufis_cleanup(); |
| 798 |
|
| 799 |
return 0; |
| 800 |
} |
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