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1 | /* lxcfs | |
2 | * | |
3 | * Copyright © 2014 Canonical, Inc | |
4 | * Author: Serge Hallyn <serge.hallyn@ubuntu.com> | |
5 | * | |
6 | * See COPYING file for details. | |
7 | */ | |
8 | ||
9 | #define FUSE_USE_VERSION 26 | |
10 | ||
11 | #include <stdio.h> | |
12 | #include <dirent.h> | |
13 | #include <fcntl.h> | |
14 | #include <fuse.h> | |
15 | #include <unistd.h> | |
16 | #include <errno.h> | |
17 | #include <stdbool.h> | |
18 | #include <time.h> | |
19 | #include <string.h> | |
20 | #include <stdlib.h> | |
21 | #include <libgen.h> | |
22 | #include <sched.h> | |
23 | #include <linux/sched.h> | |
24 | #include <sys/socket.h> | |
25 | #include <sys/mount.h> | |
26 | #include <wait.h> | |
27 | ||
28 | #include <nih/alloc.h> | |
29 | #include <nih/string.h> | |
30 | ||
31 | #include "cgmanager.h" | |
32 | ||
33 | struct lxcfs_state { | |
34 | /* | |
35 | * a null-terminated, nih-allocated list of the mounted subsystems. We | |
36 | * detect this at startup. | |
37 | */ | |
38 | char **subsystems; | |
39 | }; | |
40 | #define LXCFS_DATA ((struct lxcfs_state *) fuse_get_context()->private_data) | |
41 | ||
42 | enum { | |
43 | LXC_TYPE_CGDIR, | |
44 | LXC_TYPE_CGFILE, | |
45 | LXC_TYPE_PROC_MEMINFO, | |
46 | LXC_TYPE_PROC_CPUINFO, | |
47 | LXC_TYPE_PROC_UPTIME, | |
48 | LXC_TYPE_PROC_STAT, | |
49 | LXC_TYPE_PROC_DISKSTATS, | |
50 | }; | |
51 | ||
52 | struct file_info { | |
53 | char *controller; | |
54 | char *cgroup; | |
55 | char *file; | |
56 | int type; | |
57 | char *buf; // unused as of yet | |
58 | int buflen; | |
59 | int size; //actual data size | |
60 | }; | |
61 | ||
62 | /* reserve buffer size, for cpuall in /proc/stat */ | |
63 | #define BUF_RESERVE_SIZE 256 | |
64 | ||
65 | static char *must_copy_string(void *parent, const char *str) | |
66 | { | |
67 | if (!str) | |
68 | return NULL; | |
69 | return NIH_MUST( nih_strdup(parent, str) ); | |
70 | } | |
71 | ||
72 | /* | |
73 | * TODO - return value should denote whether child exited with failure | |
74 | * so callers can return errors. Esp read/write of tasks and cgroup.procs | |
75 | */ | |
76 | static int wait_for_pid(pid_t pid) | |
77 | { | |
78 | int status, ret; | |
79 | ||
80 | again: | |
81 | ret = waitpid(pid, &status, 0); | |
82 | if (ret == -1) { | |
83 | if (errno == EINTR) | |
84 | goto again; | |
85 | return -1; | |
86 | } | |
87 | if (ret != pid) | |
88 | goto again; | |
89 | if (!WIFEXITED(status) || WEXITSTATUS(status) != 0) | |
90 | return -1; | |
91 | return 0; | |
92 | } | |
93 | ||
94 | /* | |
95 | * Given a open file * to /proc/pid/{u,g}id_map, and an id | |
96 | * valid in the caller's namespace, return the id mapped into | |
97 | * pid's namespace. | |
98 | * Returns the mapped id, or -1 on error. | |
99 | */ | |
100 | unsigned int | |
101 | convert_id_to_ns(FILE *idfile, unsigned int in_id) | |
102 | { | |
103 | unsigned int nsuid, // base id for a range in the idfile's namespace | |
104 | hostuid, // base id for a range in the caller's namespace | |
105 | count; // number of ids in this range | |
106 | char line[400]; | |
107 | int ret; | |
108 | ||
109 | fseek(idfile, 0L, SEEK_SET); | |
110 | while (fgets(line, 400, idfile)) { | |
111 | ret = sscanf(line, "%u %u %u\n", &nsuid, &hostuid, &count); | |
112 | if (ret != 3) | |
113 | continue; | |
114 | if (hostuid + count < hostuid || nsuid + count < nsuid) { | |
115 | /* | |
116 | * uids wrapped around - unexpected as this is a procfile, | |
117 | * so just bail. | |
118 | */ | |
119 | fprintf(stderr, "pid wrapparound at entry %u %u %u in %s\n", | |
120 | nsuid, hostuid, count, line); | |
121 | return -1; | |
122 | } | |
123 | if (hostuid <= in_id && hostuid+count > in_id) { | |
124 | /* | |
125 | * now since hostuid <= in_id < hostuid+count, and | |
126 | * hostuid+count and nsuid+count do not wrap around, | |
127 | * we know that nsuid+(in_id-hostuid) which must be | |
128 | * less that nsuid+(count) must not wrap around | |
129 | */ | |
130 | return (in_id - hostuid) + nsuid; | |
131 | } | |
132 | } | |
133 | ||
134 | // no answer found | |
135 | return -1; | |
136 | } | |
137 | ||
138 | /* | |
139 | * for is_privileged_over, | |
140 | * specify whether we require the calling uid to be root in his | |
141 | * namespace | |
142 | */ | |
143 | #define NS_ROOT_REQD true | |
144 | #define NS_ROOT_OPT false | |
145 | ||
146 | static bool is_privileged_over(pid_t pid, uid_t uid, uid_t victim, bool req_ns_root) | |
147 | { | |
148 | nih_local char *fpath = NULL; | |
149 | bool answer = false; | |
150 | uid_t nsuid; | |
151 | ||
152 | if (victim == -1 || uid == -1) | |
153 | return false; | |
154 | ||
155 | /* | |
156 | * If the request is one not requiring root in the namespace, | |
157 | * then having the same uid suffices. (i.e. uid 1000 has write | |
158 | * access to files owned by uid 1000 | |
159 | */ | |
160 | if (!req_ns_root && uid == victim) | |
161 | return true; | |
162 | ||
163 | fpath = NIH_MUST( nih_sprintf(NULL, "/proc/%d/uid_map", pid) ); | |
164 | FILE *f = fopen(fpath, "r"); | |
165 | if (!f) | |
166 | return false; | |
167 | ||
168 | /* if caller's not root in his namespace, reject */ | |
169 | nsuid = convert_id_to_ns(f, uid); | |
170 | if (nsuid) | |
171 | goto out; | |
172 | ||
173 | /* | |
174 | * If victim is not mapped into caller's ns, reject. | |
175 | * XXX I'm not sure this check is needed given that fuse | |
176 | * will be sending requests where the vfs has converted | |
177 | */ | |
178 | nsuid = convert_id_to_ns(f, victim); | |
179 | if (nsuid == -1) | |
180 | goto out; | |
181 | ||
182 | answer = true; | |
183 | ||
184 | out: | |
185 | fclose(f); | |
186 | return answer; | |
187 | } | |
188 | ||
189 | static bool perms_include(int fmode, mode_t req_mode) | |
190 | { | |
191 | mode_t r; | |
192 | ||
193 | switch (req_mode & O_ACCMODE) { | |
194 | case O_RDONLY: | |
195 | r = S_IROTH; | |
196 | break; | |
197 | case O_WRONLY: | |
198 | r = S_IWOTH; | |
199 | break; | |
200 | case O_RDWR: | |
201 | r = S_IROTH | S_IWOTH; | |
202 | break; | |
203 | default: | |
204 | return false; | |
205 | } | |
206 | return ((fmode & r) == r); | |
207 | } | |
208 | ||
209 | static char *get_next_cgroup_dir(const char *taskcg, const char *querycg) | |
210 | { | |
211 | char *start, *end; | |
212 | ||
213 | if (strlen(taskcg) <= strlen(querycg)) { | |
214 | fprintf(stderr, "%s: I was fed bad input\n", __func__); | |
215 | return NULL; | |
216 | } | |
217 | ||
218 | if (strcmp(querycg, "/") == 0) | |
219 | start = NIH_MUST( nih_strdup(NULL, taskcg + 1) ); | |
220 | else | |
221 | start = NIH_MUST( nih_strdup(NULL, taskcg + strlen(querycg) + 1) ); | |
222 | end = strchr(start, '/'); | |
223 | if (end) | |
224 | *end = '\0'; | |
225 | return start; | |
226 | } | |
227 | ||
228 | /* | |
229 | * check whether a fuse context may access a cgroup dir or file | |
230 | * | |
231 | * If file is not null, it is a cgroup file to check under cg. | |
232 | * If file is null, then we are checking perms on cg itself. | |
233 | * | |
234 | * For files we can check the mode of the list_keys result. | |
235 | * For cgroups, we must make assumptions based on the files under the | |
236 | * cgroup, because cgmanager doesn't tell us ownership/perms of cgroups | |
237 | * yet. | |
238 | */ | |
239 | static bool fc_may_access(struct fuse_context *fc, const char *contrl, const char *cg, const char *file, mode_t mode) | |
240 | { | |
241 | nih_local struct cgm_keys **list = NULL; | |
242 | int i; | |
243 | ||
244 | if (!file) | |
245 | file = "tasks"; | |
246 | ||
247 | if (*file == '/') | |
248 | file++; | |
249 | ||
250 | if (!cgm_list_keys(contrl, cg, &list)) | |
251 | return false; | |
252 | for (i = 0; list[i]; i++) { | |
253 | if (strcmp(list[i]->name, file) == 0) { | |
254 | struct cgm_keys *k = list[i]; | |
255 | if (is_privileged_over(fc->pid, fc->uid, k->uid, NS_ROOT_OPT)) { | |
256 | if (perms_include(k->mode >> 6, mode)) | |
257 | return true; | |
258 | } | |
259 | if (fc->gid == k->gid) { | |
260 | if (perms_include(k->mode >> 3, mode)) | |
261 | return true; | |
262 | } | |
263 | return perms_include(k->mode, mode); | |
264 | } | |
265 | } | |
266 | ||
267 | return false; | |
268 | } | |
269 | ||
270 | static void stripnewline(char *x) | |
271 | { | |
272 | size_t l = strlen(x); | |
273 | if (l && x[l-1] == '\n') | |
274 | x[l-1] = '\0'; | |
275 | } | |
276 | ||
277 | /* | |
278 | * If caller is in /a/b/c/d, he may only act on things under cg=/a/b/c/d. | |
279 | * If caller is in /a, he may act on /a/b, but not on /b. | |
280 | * if the answer is false and nextcg is not NULL, then *nextcg will point | |
281 | * to a nih_alloc'd string containing the next cgroup directory under cg | |
282 | */ | |
283 | static bool caller_is_in_ancestor(pid_t pid, const char *contrl, const char *cg, char **nextcg) | |
284 | { | |
285 | nih_local char *fnam = NULL; | |
286 | FILE *f; | |
287 | bool answer = false; | |
288 | char *line = NULL; | |
289 | size_t len = 0; | |
290 | ||
291 | fnam = NIH_MUST( nih_sprintf(NULL, "/proc/%d/cgroup", pid) ); | |
292 | if (!(f = fopen(fnam, "r"))) | |
293 | return false; | |
294 | ||
295 | while (getline(&line, &len, f) != -1) { | |
296 | char *c1, *c2, *linecmp; | |
297 | if (!line[0]) | |
298 | continue; | |
299 | c1 = strchr(line, ':'); | |
300 | if (!c1) | |
301 | goto out; | |
302 | c1++; | |
303 | c2 = strchr(c1, ':'); | |
304 | if (!c2) | |
305 | goto out; | |
306 | *c2 = '\0'; | |
307 | if (strcmp(c1, contrl) != 0) | |
308 | continue; | |
309 | c2++; | |
310 | stripnewline(c2); | |
311 | /* | |
312 | * callers pass in '/' for root cgroup, otherwise they pass | |
313 | * in a cgroup without leading '/' | |
314 | */ | |
315 | linecmp = *cg == '/' ? c2 : c2+1; | |
316 | if (strncmp(linecmp, cg, strlen(linecmp)) != 0) { | |
317 | if (nextcg) | |
318 | *nextcg = get_next_cgroup_dir(linecmp, cg); | |
319 | goto out; | |
320 | } | |
321 | answer = true; | |
322 | goto out; | |
323 | } | |
324 | ||
325 | out: | |
326 | fclose(f); | |
327 | free(line); | |
328 | return answer; | |
329 | } | |
330 | ||
331 | /* | |
332 | * given /cgroup/freezer/a/b, return "freezer". this will be nih-allocated | |
333 | * and needs to be nih_freed. | |
334 | */ | |
335 | static char *pick_controller_from_path(struct fuse_context *fc, const char *path) | |
336 | { | |
337 | const char *p1; | |
338 | char *ret, *slash; | |
339 | ||
340 | if (strlen(path) < 9) | |
341 | return NULL; | |
342 | if (*(path+7) != '/') | |
343 | return NULL; | |
344 | p1 = path+8; | |
345 | ret = nih_strdup(NULL, p1); | |
346 | if (!ret) | |
347 | return ret; | |
348 | slash = strstr(ret, "/"); | |
349 | if (slash) | |
350 | *slash = '\0'; | |
351 | ||
352 | /* verify that it is a subsystem */ | |
353 | char **list = LXCFS_DATA ? LXCFS_DATA->subsystems : NULL; | |
354 | int i; | |
355 | if (!list) { | |
356 | nih_free(ret); | |
357 | return NULL; | |
358 | } | |
359 | for (i = 0; list[i]; i++) { | |
360 | if (strcmp(list[i], ret) == 0) | |
361 | return ret; | |
362 | } | |
363 | nih_free(ret); | |
364 | return NULL; | |
365 | } | |
366 | ||
367 | /* | |
368 | * Find the start of cgroup in /cgroup/controller/the/cgroup/path | |
369 | * Note that the returned value may include files (keynames) etc | |
370 | */ | |
371 | static const char *find_cgroup_in_path(const char *path) | |
372 | { | |
373 | const char *p1; | |
374 | ||
375 | if (strlen(path) < 9) | |
376 | return NULL; | |
377 | p1 = strstr(path+8, "/"); | |
378 | if (!p1) | |
379 | return NULL; | |
380 | return p1+1; | |
381 | } | |
382 | ||
383 | static bool is_child_cgroup(const char *contr, const char *dir, const char *f) | |
384 | { | |
385 | nih_local char **list = NULL; | |
386 | int i; | |
387 | ||
388 | if (!f) | |
389 | return false; | |
390 | if (*f == '/') | |
391 | f++; | |
392 | ||
393 | if (!cgm_list_children(contr, dir, &list)) | |
394 | return false; | |
395 | for (i = 0; list[i]; i++) { | |
396 | if (strcmp(list[i], f) == 0) | |
397 | return true; | |
398 | } | |
399 | ||
400 | return false; | |
401 | } | |
402 | ||
403 | static struct cgm_keys *get_cgroup_key(const char *contr, const char *dir, const char *f) | |
404 | { | |
405 | nih_local struct cgm_keys **list = NULL; | |
406 | struct cgm_keys *k; | |
407 | int i; | |
408 | ||
409 | if (!f) | |
410 | return NULL; | |
411 | if (*f == '/') | |
412 | f++; | |
413 | if (!cgm_list_keys(contr, dir, &list)) | |
414 | return NULL; | |
415 | for (i = 0; list[i]; i++) { | |
416 | if (strcmp(list[i]->name, f) == 0) { | |
417 | k = NIH_MUST( nih_alloc(NULL, (sizeof(*k))) ); | |
418 | k->name = NIH_MUST( nih_strdup(k, list[i]->name) ); | |
419 | k->uid = list[i]->uid; | |
420 | k->gid = list[i]->gid; | |
421 | k->mode = list[i]->mode; | |
422 | return k; | |
423 | } | |
424 | } | |
425 | ||
426 | return NULL; | |
427 | } | |
428 | ||
429 | static void get_cgdir_and_path(const char *cg, char **dir, char **file) | |
430 | { | |
431 | char *p; | |
432 | ||
433 | *dir = NIH_MUST( nih_strdup(NULL, cg) ); | |
434 | *file = strrchr(cg, '/'); | |
435 | if (!*file) { | |
436 | *file = NULL; | |
437 | return; | |
438 | } | |
439 | p = strrchr(*dir, '/'); | |
440 | *p = '\0'; | |
441 | } | |
442 | ||
443 | /* | |
444 | * FUSE ops for /cgroup | |
445 | */ | |
446 | ||
447 | static int cg_getattr(const char *path, struct stat *sb) | |
448 | { | |
449 | struct timespec now; | |
450 | struct fuse_context *fc = fuse_get_context(); | |
451 | nih_local char * cgdir = NULL; | |
452 | char *fpath = NULL, *path1, *path2; | |
453 | nih_local struct cgm_keys *k = NULL; | |
454 | const char *cgroup; | |
455 | nih_local char *controller = NULL; | |
456 | ||
457 | ||
458 | if (!fc) | |
459 | return -EIO; | |
460 | ||
461 | memset(sb, 0, sizeof(struct stat)); | |
462 | ||
463 | if (clock_gettime(CLOCK_REALTIME, &now) < 0) | |
464 | return -EINVAL; | |
465 | ||
466 | sb->st_uid = sb->st_gid = 0; | |
467 | sb->st_atim = sb->st_mtim = sb->st_ctim = now; | |
468 | sb->st_size = 0; | |
469 | ||
470 | if (strcmp(path, "/cgroup") == 0) { | |
471 | sb->st_mode = S_IFDIR | 00755; | |
472 | sb->st_nlink = 2; | |
473 | return 0; | |
474 | } | |
475 | ||
476 | controller = pick_controller_from_path(fc, path); | |
477 | if (!controller) | |
478 | return -EIO; | |
479 | cgroup = find_cgroup_in_path(path); | |
480 | if (!cgroup) { | |
481 | /* this is just /cgroup/controller, return it as a dir */ | |
482 | sb->st_mode = S_IFDIR | 00755; | |
483 | sb->st_nlink = 2; | |
484 | return 0; | |
485 | } | |
486 | ||
487 | get_cgdir_and_path(cgroup, &cgdir, &fpath); | |
488 | ||
489 | if (!fpath) { | |
490 | path1 = "/"; | |
491 | path2 = cgdir; | |
492 | } else { | |
493 | path1 = cgdir; | |
494 | path2 = fpath; | |
495 | } | |
496 | ||
497 | /* check that cgcopy is either a child cgroup of cgdir, or listed in its keys. | |
498 | * Then check that caller's cgroup is under path if fpath is a child | |
499 | * cgroup, or cgdir if fpath is a file */ | |
500 | ||
501 | if (is_child_cgroup(controller, path1, path2)) { | |
502 | if (!caller_is_in_ancestor(fc->pid, controller, cgroup, NULL)) { | |
503 | /* this is just /cgroup/controller, return it as a dir */ | |
504 | sb->st_mode = S_IFDIR | 00555; | |
505 | sb->st_nlink = 2; | |
506 | return 0; | |
507 | } | |
508 | if (!fc_may_access(fc, controller, cgroup, NULL, O_RDONLY)) | |
509 | return -EACCES; | |
510 | ||
511 | // get uid, gid, from '/tasks' file and make up a mode | |
512 | // That is a hack, until cgmanager gains a GetCgroupPerms fn. | |
513 | sb->st_mode = S_IFDIR | 00755; | |
514 | k = get_cgroup_key(controller, cgroup, "tasks"); | |
515 | if (!k) { | |
516 | sb->st_uid = sb->st_gid = 0; | |
517 | } else { | |
518 | sb->st_uid = k->uid; | |
519 | sb->st_gid = k->gid; | |
520 | } | |
521 | sb->st_nlink = 2; | |
522 | return 0; | |
523 | } | |
524 | ||
525 | if ((k = get_cgroup_key(controller, path1, path2)) != NULL) { | |
526 | if (!caller_is_in_ancestor(fc->pid, controller, path1, NULL)) | |
527 | return -ENOENT; | |
528 | if (!fc_may_access(fc, controller, path1, path2, O_RDONLY)) | |
529 | return -EACCES; | |
530 | ||
531 | sb->st_mode = S_IFREG | k->mode; | |
532 | sb->st_nlink = 1; | |
533 | sb->st_uid = k->uid; | |
534 | sb->st_gid = k->gid; | |
535 | sb->st_size = 0; | |
536 | return 0; | |
537 | } | |
538 | ||
539 | return -ENOENT; | |
540 | } | |
541 | ||
542 | /* | |
543 | * TODO - cache these results in a table for use in opendir, free | |
544 | * in releasedir | |
545 | */ | |
546 | static int cg_opendir(const char *path, struct fuse_file_info *fi) | |
547 | { | |
548 | struct fuse_context *fc = fuse_get_context(); | |
549 | nih_local struct cgm_keys **list = NULL; | |
550 | const char *cgroup; | |
551 | struct file_info *dir_info; | |
552 | nih_local char *controller = NULL; | |
553 | ||
554 | if (!fc) | |
555 | return -EIO; | |
556 | ||
557 | if (strcmp(path, "/cgroup") == 0) { | |
558 | cgroup = NULL; | |
559 | controller = NULL; | |
560 | } else { | |
561 | // return list of keys for the controller, and list of child cgroups | |
562 | controller = pick_controller_from_path(fc, path); | |
563 | if (!controller) | |
564 | return -EIO; | |
565 | ||
566 | cgroup = find_cgroup_in_path(path); | |
567 | if (!cgroup) { | |
568 | /* this is just /cgroup/controller, return its contents */ | |
569 | cgroup = "/"; | |
570 | } | |
571 | } | |
572 | ||
573 | if (cgroup && !fc_may_access(fc, controller, cgroup, NULL, O_RDONLY)) | |
574 | return -EACCES; | |
575 | ||
576 | /* we'll free this at cg_releasedir */ | |
577 | dir_info = NIH_MUST( nih_alloc(NULL, sizeof(*dir_info)) ); | |
578 | dir_info->controller = must_copy_string(dir_info, controller); | |
579 | dir_info->cgroup = must_copy_string(dir_info, cgroup); | |
580 | dir_info->type = LXC_TYPE_CGDIR; | |
581 | dir_info->buf = NULL; | |
582 | dir_info->file = NULL; | |
583 | dir_info->buflen = 0; | |
584 | ||
585 | fi->fh = (unsigned long)dir_info; | |
586 | return 0; | |
587 | } | |
588 | ||
589 | static int cg_readdir(const char *path, void *buf, fuse_fill_dir_t filler, off_t offset, | |
590 | struct fuse_file_info *fi) | |
591 | { | |
592 | struct file_info *d = (struct file_info *)fi->fh; | |
593 | nih_local struct cgm_keys **list = NULL; | |
594 | int i; | |
595 | nih_local char *nextcg = NULL; | |
596 | struct fuse_context *fc = fuse_get_context(); | |
597 | ||
598 | if (d->type != LXC_TYPE_CGDIR) { | |
599 | fprintf(stderr, "Internal error: file cache info used in readdir\n"); | |
600 | return -EIO; | |
601 | } | |
602 | if (!d->cgroup && !d->controller) { | |
603 | // ls /var/lib/lxcfs/cgroup - just show list of controllers | |
604 | char **list = LXCFS_DATA ? LXCFS_DATA->subsystems : NULL; | |
605 | int i; | |
606 | ||
607 | if (!list) | |
608 | return -EIO; | |
609 | ||
610 | for (i = 0; list[i]; i++) { | |
611 | if (filler(buf, list[i], NULL, 0) != 0) { | |
612 | return -EIO; | |
613 | } | |
614 | } | |
615 | return 0; | |
616 | } | |
617 | ||
618 | if (!cgm_list_keys(d->controller, d->cgroup, &list)) | |
619 | // not a valid cgroup | |
620 | return -EINVAL; | |
621 | ||
622 | if (!caller_is_in_ancestor(fc->pid, d->controller, d->cgroup, &nextcg)) { | |
623 | if (nextcg) { | |
624 | int ret; | |
625 | ret = filler(buf, nextcg, NULL, 0); | |
626 | if (ret != 0) | |
627 | return -EIO; | |
628 | } | |
629 | return 0; | |
630 | } | |
631 | ||
632 | for (i = 0; list[i]; i++) { | |
633 | if (filler(buf, list[i]->name, NULL, 0) != 0) { | |
634 | return -EIO; | |
635 | } | |
636 | } | |
637 | ||
638 | // now get the list of child cgroups | |
639 | nih_local char **clist = NULL; | |
640 | ||
641 | if (!cgm_list_children(d->controller, d->cgroup, &clist)) | |
642 | return 0; | |
643 | for (i = 0; clist[i]; i++) { | |
644 | if (filler(buf, clist[i], NULL, 0) != 0) { | |
645 | return -EIO; | |
646 | } | |
647 | } | |
648 | return 0; | |
649 | } | |
650 | ||
651 | static void do_release_file_info(struct file_info *f) | |
652 | { | |
653 | /* | |
654 | * all file_info fields which are nih_alloc()d with f as parent | |
655 | * will be automatically freed | |
656 | */ | |
657 | nih_free(f); | |
658 | } | |
659 | ||
660 | static int cg_releasedir(const char *path, struct fuse_file_info *fi) | |
661 | { | |
662 | struct file_info *d = (struct file_info *)fi->fh; | |
663 | ||
664 | do_release_file_info(d); | |
665 | return 0; | |
666 | } | |
667 | ||
668 | static int cg_open(const char *path, struct fuse_file_info *fi) | |
669 | { | |
670 | nih_local char *controller = NULL; | |
671 | const char *cgroup; | |
672 | char *fpath = NULL, *path1, *path2; | |
673 | nih_local char * cgdir = NULL; | |
674 | nih_local struct cgm_keys *k = NULL; | |
675 | struct file_info *file_info; | |
676 | struct fuse_context *fc = fuse_get_context(); | |
677 | ||
678 | if (!fc) | |
679 | return -EIO; | |
680 | ||
681 | controller = pick_controller_from_path(fc, path); | |
682 | if (!controller) | |
683 | return -EIO; | |
684 | cgroup = find_cgroup_in_path(path); | |
685 | if (!cgroup) | |
686 | return -EINVAL; | |
687 | ||
688 | get_cgdir_and_path(cgroup, &cgdir, &fpath); | |
689 | if (!fpath) { | |
690 | path1 = "/"; | |
691 | path2 = cgdir; | |
692 | } else { | |
693 | path1 = cgdir; | |
694 | path2 = fpath; | |
695 | } | |
696 | ||
697 | k = get_cgroup_key(controller, path1, path2); | |
698 | if (!k) | |
699 | return -EINVAL; | |
700 | ||
701 | if (!fc_may_access(fc, controller, path1, path2, fi->flags)) | |
702 | // should never get here | |
703 | return -EACCES; | |
704 | ||
705 | /* we'll free this at cg_release */ | |
706 | file_info = NIH_MUST( nih_alloc(NULL, sizeof(*file_info)) ); | |
707 | file_info->controller = must_copy_string(file_info, controller); | |
708 | file_info->cgroup = must_copy_string(file_info, path1); | |
709 | file_info->file = must_copy_string(file_info, path2); | |
710 | file_info->type = LXC_TYPE_CGFILE; | |
711 | file_info->buf = NULL; | |
712 | file_info->buflen = 0; | |
713 | ||
714 | fi->fh = (unsigned long)file_info; | |
715 | return 0; | |
716 | } | |
717 | ||
718 | static int cg_release(const char *path, struct fuse_file_info *fi) | |
719 | { | |
720 | struct file_info *f = (struct file_info *)fi->fh; | |
721 | ||
722 | do_release_file_info(f); | |
723 | return 0; | |
724 | } | |
725 | ||
726 | static int msgrecv(int sockfd, void *buf, size_t len) | |
727 | { | |
728 | struct timeval tv; | |
729 | fd_set rfds; | |
730 | ||
731 | FD_ZERO(&rfds); | |
732 | FD_SET(sockfd, &rfds); | |
733 | tv.tv_sec = 2; | |
734 | tv.tv_usec = 0; | |
735 | ||
736 | if (select(sockfd+1, &rfds, NULL, NULL, &tv) <= 0) | |
737 | return -1; | |
738 | return recv(sockfd, buf, len, MSG_DONTWAIT); | |
739 | } | |
740 | ||
741 | #define SEND_CREDS_OK 0 | |
742 | #define SEND_CREDS_NOTSK 1 | |
743 | #define SEND_CREDS_FAIL 2 | |
744 | static int send_creds(int sock, struct ucred *cred, char v, bool pingfirst) | |
745 | { | |
746 | struct msghdr msg = { 0 }; | |
747 | struct iovec iov; | |
748 | struct cmsghdr *cmsg; | |
749 | char cmsgbuf[CMSG_SPACE(sizeof(*cred))]; | |
750 | char buf[1]; | |
751 | buf[0] = 'p'; | |
752 | ||
753 | if (pingfirst) { | |
754 | if (msgrecv(sock, buf, 1) != 1) { | |
755 | fprintf(stderr, "%s: Error getting reply from server over socketpair\n", | |
756 | __func__); | |
757 | return SEND_CREDS_FAIL; | |
758 | } | |
759 | } | |
760 | ||
761 | msg.msg_control = cmsgbuf; | |
762 | msg.msg_controllen = sizeof(cmsgbuf); | |
763 | ||
764 | cmsg = CMSG_FIRSTHDR(&msg); | |
765 | cmsg->cmsg_len = CMSG_LEN(sizeof(struct ucred)); | |
766 | cmsg->cmsg_level = SOL_SOCKET; | |
767 | cmsg->cmsg_type = SCM_CREDENTIALS; | |
768 | memcpy(CMSG_DATA(cmsg), cred, sizeof(*cred)); | |
769 | ||
770 | msg.msg_name = NULL; | |
771 | msg.msg_namelen = 0; | |
772 | ||
773 | buf[0] = v; | |
774 | iov.iov_base = buf; | |
775 | iov.iov_len = sizeof(buf); | |
776 | msg.msg_iov = &iov; | |
777 | msg.msg_iovlen = 1; | |
778 | ||
779 | if (sendmsg(sock, &msg, 0) < 0) { | |
780 | fprintf(stderr, "%s: failed at sendmsg: %s\n", __func__, | |
781 | strerror(errno)); | |
782 | if (errno == 3) | |
783 | return SEND_CREDS_NOTSK; | |
784 | return SEND_CREDS_FAIL; | |
785 | } | |
786 | ||
787 | return SEND_CREDS_OK; | |
788 | } | |
789 | ||
790 | static bool recv_creds(int sock, struct ucred *cred, char *v) | |
791 | { | |
792 | struct msghdr msg = { 0 }; | |
793 | struct iovec iov; | |
794 | struct cmsghdr *cmsg; | |
795 | char cmsgbuf[CMSG_SPACE(sizeof(*cred))]; | |
796 | char buf[1]; | |
797 | int ret; | |
798 | int optval = 1; | |
799 | struct timeval tv; | |
800 | fd_set rfds; | |
801 | ||
802 | *v = '1'; | |
803 | ||
804 | cred->pid = -1; | |
805 | cred->uid = -1; | |
806 | cred->gid = -1; | |
807 | ||
808 | if (setsockopt(sock, SOL_SOCKET, SO_PASSCRED, &optval, sizeof(optval)) == -1) { | |
809 | fprintf(stderr, "Failed to set passcred: %s\n", strerror(errno)); | |
810 | return false; | |
811 | } | |
812 | buf[0] = '1'; | |
813 | if (write(sock, buf, 1) != 1) { | |
814 | fprintf(stderr, "Failed to start write on scm fd: %s\n", strerror(errno)); | |
815 | return false; | |
816 | } | |
817 | ||
818 | msg.msg_name = NULL; | |
819 | msg.msg_namelen = 0; | |
820 | msg.msg_control = cmsgbuf; | |
821 | msg.msg_controllen = sizeof(cmsgbuf); | |
822 | ||
823 | iov.iov_base = buf; | |
824 | iov.iov_len = sizeof(buf); | |
825 | msg.msg_iov = &iov; | |
826 | msg.msg_iovlen = 1; | |
827 | ||
828 | FD_ZERO(&rfds); | |
829 | FD_SET(sock, &rfds); | |
830 | tv.tv_sec = 2; | |
831 | tv.tv_usec = 0; | |
832 | if (select(sock+1, &rfds, NULL, NULL, &tv) <= 0) { | |
833 | fprintf(stderr, "Failed to select for scm_cred: %s\n", | |
834 | strerror(errno)); | |
835 | return false; | |
836 | } | |
837 | ret = recvmsg(sock, &msg, MSG_DONTWAIT); | |
838 | if (ret < 0) { | |
839 | fprintf(stderr, "Failed to receive scm_cred: %s\n", | |
840 | strerror(errno)); | |
841 | return false; | |
842 | } | |
843 | ||
844 | cmsg = CMSG_FIRSTHDR(&msg); | |
845 | ||
846 | if (cmsg && cmsg->cmsg_len == CMSG_LEN(sizeof(struct ucred)) && | |
847 | cmsg->cmsg_level == SOL_SOCKET && | |
848 | cmsg->cmsg_type == SCM_CREDENTIALS) { | |
849 | memcpy(cred, CMSG_DATA(cmsg), sizeof(*cred)); | |
850 | } | |
851 | *v = buf[0]; | |
852 | ||
853 | return true; | |
854 | } | |
855 | ||
856 | ||
857 | /* | |
858 | * pid_to_ns - reads pids from a ucred over a socket, then writes the | |
859 | * int value back over the socket. This shifts the pid from the | |
860 | * sender's pidns into tpid's pidns. | |
861 | */ | |
862 | static void pid_to_ns(int sock, pid_t tpid) | |
863 | { | |
864 | char v = '0'; | |
865 | struct ucred cred; | |
866 | ||
867 | while (recv_creds(sock, &cred, &v)) { | |
868 | if (v == '1') | |
869 | exit(0); | |
870 | if (write(sock, &cred.pid, sizeof(pid_t)) != sizeof(pid_t)) | |
871 | exit(1); | |
872 | } | |
873 | exit(0); | |
874 | } | |
875 | ||
876 | /* | |
877 | * pid_to_ns_wrapper: when you setns into a pidns, you yourself remain | |
878 | * in your old pidns. Only children which you fork will be in the target | |
879 | * pidns. So the pid_to_ns_wrapper does the setns, then forks a child to | |
880 | * actually convert pids | |
881 | */ | |
882 | static void pid_to_ns_wrapper(int sock, pid_t tpid) | |
883 | { | |
884 | int newnsfd = -1, ret, cpipe[2]; | |
885 | char fnam[100]; | |
886 | pid_t cpid; | |
887 | struct timeval tv; | |
888 | fd_set s; | |
889 | char v; | |
890 | ||
891 | sprintf(fnam, "/proc/%d/ns/pid", tpid); | |
892 | newnsfd = open(fnam, O_RDONLY); | |
893 | if (newnsfd < 0) | |
894 | exit(1); | |
895 | if (setns(newnsfd, 0) < 0) | |
896 | exit(1); | |
897 | close(newnsfd); | |
898 | ||
899 | if (pipe(cpipe) < 0) | |
900 | exit(1); | |
901 | ||
902 | loop: | |
903 | cpid = fork(); | |
904 | if (cpid < 0) | |
905 | exit(1); | |
906 | ||
907 | if (!cpid) { | |
908 | char b = '1'; | |
909 | close(cpipe[0]); | |
910 | if (write(cpipe[1], &b, sizeof(char)) < 0) { | |
911 | fprintf(stderr, "%s (child): erorr on write: %s\n", | |
912 | __func__, strerror(errno)); | |
913 | } | |
914 | close(cpipe[1]); | |
915 | pid_to_ns(sock, tpid); | |
916 | } | |
917 | // give the child 1 second to be done forking and | |
918 | // write it's ack | |
919 | FD_ZERO(&s); | |
920 | FD_SET(cpipe[0], &s); | |
921 | tv.tv_sec = 1; | |
922 | tv.tv_usec = 0; | |
923 | ret = select(cpipe[0]+1, &s, NULL, NULL, &tv); | |
924 | if (ret <= 0) | |
925 | goto again; | |
926 | ret = read(cpipe[0], &v, 1); | |
927 | if (ret != sizeof(char) || v != '1') { | |
928 | goto again; | |
929 | } | |
930 | ||
931 | if (!wait_for_pid(cpid)) | |
932 | exit(1); | |
933 | exit(0); | |
934 | ||
935 | again: | |
936 | kill(cpid, SIGKILL); | |
937 | wait_for_pid(cpid); | |
938 | goto loop; | |
939 | } | |
940 | ||
941 | /* | |
942 | * To read cgroup files with a particular pid, we will setns into the child | |
943 | * pidns, open a pipe, fork a child - which will be the first to really be in | |
944 | * the child ns - which does the cgm_get_value and writes the data to the pipe. | |
945 | */ | |
946 | static bool do_read_pids(pid_t tpid, const char *contrl, const char *cg, const char *file, char **d) | |
947 | { | |
948 | int sock[2] = {-1, -1}; | |
949 | nih_local char *tmpdata = NULL; | |
950 | int ret; | |
951 | pid_t qpid, cpid = -1; | |
952 | bool answer = false; | |
953 | char v = '0'; | |
954 | struct ucred cred; | |
955 | struct timeval tv; | |
956 | fd_set s; | |
957 | ||
958 | if (!cgm_get_value(contrl, cg, file, &tmpdata)) | |
959 | return false; | |
960 | ||
961 | /* | |
962 | * Now we read the pids from returned data one by one, pass | |
963 | * them into a child in the target namespace, read back the | |
964 | * translated pids, and put them into our to-return data | |
965 | */ | |
966 | ||
967 | if (socketpair(AF_UNIX, SOCK_DGRAM, 0, sock) < 0) { | |
968 | perror("socketpair"); | |
969 | exit(1); | |
970 | } | |
971 | ||
972 | cpid = fork(); | |
973 | if (cpid == -1) | |
974 | goto out; | |
975 | ||
976 | if (!cpid) // child | |
977 | pid_to_ns_wrapper(sock[1], tpid); | |
978 | ||
979 | char *ptr = tmpdata; | |
980 | cred.uid = 0; | |
981 | cred.gid = 0; | |
982 | while (sscanf(ptr, "%d\n", &qpid) == 1) { | |
983 | cred.pid = qpid; | |
984 | ret = send_creds(sock[0], &cred, v, true); | |
985 | ||
986 | if (ret == SEND_CREDS_NOTSK) | |
987 | goto next; | |
988 | if (ret == SEND_CREDS_FAIL) | |
989 | goto out; | |
990 | ||
991 | // read converted results | |
992 | FD_ZERO(&s); | |
993 | FD_SET(sock[0], &s); | |
994 | tv.tv_sec = 2; | |
995 | tv.tv_usec = 0; | |
996 | ret = select(sock[0]+1, &s, NULL, NULL, &tv); | |
997 | if (ret <= 0) { | |
998 | fprintf(stderr, "%s: select error waiting for pid from child: %s\n", | |
999 | __func__, strerror(errno)); | |
1000 | goto out; | |
1001 | } | |
1002 | if (read(sock[0], &qpid, sizeof(qpid)) != sizeof(qpid)) { | |
1003 | fprintf(stderr, "%s: error reading pid from child: %s\n", | |
1004 | __func__, strerror(errno)); | |
1005 | goto out; | |
1006 | } | |
1007 | NIH_MUST( nih_strcat_sprintf(d, NULL, "%d\n", qpid) ); | |
1008 | next: | |
1009 | ptr = strchr(ptr, '\n'); | |
1010 | if (!ptr) | |
1011 | break; | |
1012 | ptr++; | |
1013 | } | |
1014 | ||
1015 | cred.pid = getpid(); | |
1016 | v = '1'; | |
1017 | if (send_creds(sock[0], &cred, v, true) != SEND_CREDS_OK) { | |
1018 | // failed to ask child to exit | |
1019 | fprintf(stderr, "%s: failed to ask child to exit: %s\n", | |
1020 | __func__, strerror(errno)); | |
1021 | goto out; | |
1022 | } | |
1023 | ||
1024 | answer = true; | |
1025 | ||
1026 | out: | |
1027 | if (cpid != -1) | |
1028 | wait_for_pid(cpid); | |
1029 | if (sock[0] != -1) { | |
1030 | close(sock[0]); | |
1031 | close(sock[1]); | |
1032 | } | |
1033 | return answer; | |
1034 | } | |
1035 | ||
1036 | static int cg_read(const char *path, char *buf, size_t size, off_t offset, | |
1037 | struct fuse_file_info *fi) | |
1038 | { | |
1039 | struct fuse_context *fc = fuse_get_context(); | |
1040 | struct file_info *f = (struct file_info *)fi->fh; | |
1041 | nih_local struct cgm_keys *k = NULL; | |
1042 | ||
1043 | if (f->type != LXC_TYPE_CGFILE) { | |
1044 | fprintf(stderr, "Internal error: directory cache info used in cg_read\n"); | |
1045 | return -EIO; | |
1046 | } | |
1047 | ||
1048 | if (offset) | |
1049 | return 0; | |
1050 | ||
1051 | if (!fc) | |
1052 | return -EIO; | |
1053 | ||
1054 | if (!f->controller) | |
1055 | return -EINVAL; | |
1056 | ||
1057 | if ((k = get_cgroup_key(f->controller, f->cgroup, f->file)) != NULL) { | |
1058 | nih_local char *data = NULL; | |
1059 | int s; | |
1060 | bool r; | |
1061 | ||
1062 | if (!fc_may_access(fc, f->controller, f->cgroup, f->file, O_RDONLY)) | |
1063 | // should never get here | |
1064 | return -EACCES; | |
1065 | ||
1066 | if (strcmp(f->file, "tasks") == 0 || | |
1067 | strcmp(f->file, "/tasks") == 0 || | |
1068 | strcmp(f->file, "/cgroup.procs") == 0 || | |
1069 | strcmp(f->file, "cgroup.procs") == 0) | |
1070 | // special case - we have to translate the pids | |
1071 | r = do_read_pids(fc->pid, f->controller, f->cgroup, f->file, &data); | |
1072 | else | |
1073 | r = cgm_get_value(f->controller, f->cgroup, f->file, &data); | |
1074 | ||
1075 | if (!r) | |
1076 | return -EINVAL; | |
1077 | ||
1078 | if (!data) | |
1079 | return 0; | |
1080 | s = strlen(data); | |
1081 | if (s > size) | |
1082 | s = size; | |
1083 | memcpy(buf, data, s); | |
1084 | if (s > 0 && s < size && data[s-1] != '\n') | |
1085 | buf[s++] = '\n'; | |
1086 | ||
1087 | return s; | |
1088 | } | |
1089 | ||
1090 | return -EINVAL; | |
1091 | } | |
1092 | ||
1093 | static void pid_from_ns(int sock, pid_t tpid) | |
1094 | { | |
1095 | pid_t vpid; | |
1096 | struct ucred cred; | |
1097 | char v; | |
1098 | struct timeval tv; | |
1099 | fd_set s; | |
1100 | int ret; | |
1101 | ||
1102 | cred.uid = 0; | |
1103 | cred.gid = 0; | |
1104 | while (1) { | |
1105 | FD_ZERO(&s); | |
1106 | FD_SET(sock, &s); | |
1107 | tv.tv_sec = 2; | |
1108 | tv.tv_usec = 0; | |
1109 | ret = select(sock+1, &s, NULL, NULL, &tv); | |
1110 | if (ret <= 0) { | |
1111 | fprintf(stderr, "%s: bad select before read from parent: %s\n", | |
1112 | __func__, strerror(errno)); | |
1113 | exit(1); | |
1114 | } | |
1115 | if ((ret = read(sock, &vpid, sizeof(pid_t))) != sizeof(pid_t)) { | |
1116 | fprintf(stderr, "%s: bad read from parent: %s\n", | |
1117 | __func__, strerror(errno)); | |
1118 | exit(1); | |
1119 | } | |
1120 | if (vpid == -1) // done | |
1121 | break; | |
1122 | v = '0'; | |
1123 | cred.pid = vpid; | |
1124 | if (send_creds(sock, &cred, v, true) != SEND_CREDS_OK) { | |
1125 | v = '1'; | |
1126 | cred.pid = getpid(); | |
1127 | if (send_creds(sock, &cred, v, false) != SEND_CREDS_OK) | |
1128 | exit(1); | |
1129 | } | |
1130 | } | |
1131 | exit(0); | |
1132 | } | |
1133 | ||
1134 | static void pid_from_ns_wrapper(int sock, pid_t tpid) | |
1135 | { | |
1136 | int newnsfd = -1, ret, cpipe[2]; | |
1137 | char fnam[100]; | |
1138 | pid_t cpid; | |
1139 | fd_set s; | |
1140 | struct timeval tv; | |
1141 | char v; | |
1142 | ||
1143 | sprintf(fnam, "/proc/%d/ns/pid", tpid); | |
1144 | newnsfd = open(fnam, O_RDONLY); | |
1145 | if (newnsfd < 0) | |
1146 | exit(1); | |
1147 | if (setns(newnsfd, 0) < 0) | |
1148 | exit(1); | |
1149 | close(newnsfd); | |
1150 | ||
1151 | if (pipe(cpipe) < 0) | |
1152 | exit(1); | |
1153 | ||
1154 | loop: | |
1155 | cpid = fork(); | |
1156 | ||
1157 | if (cpid < 0) | |
1158 | exit(1); | |
1159 | ||
1160 | if (!cpid) { | |
1161 | char b = '1'; | |
1162 | close(cpipe[0]); | |
1163 | if (write(cpipe[1], &b, sizeof(char)) < 0) { | |
1164 | fprintf(stderr, "%s (child): erorr on write: %s\n", | |
1165 | __func__, strerror(errno)); | |
1166 | } | |
1167 | close(cpipe[1]); | |
1168 | pid_from_ns(sock, tpid); | |
1169 | } | |
1170 | ||
1171 | // give the child 1 second to be done forking and | |
1172 | // write it's ack | |
1173 | FD_ZERO(&s); | |
1174 | FD_SET(cpipe[0], &s); | |
1175 | tv.tv_sec = 1; | |
1176 | tv.tv_usec = 0; | |
1177 | ret = select(cpipe[0]+1, &s, NULL, NULL, &tv); | |
1178 | if (ret <= 0) | |
1179 | goto again; | |
1180 | ret = read(cpipe[0], &v, 1); | |
1181 | if (ret != sizeof(char) || v != '1') { | |
1182 | goto again; | |
1183 | } | |
1184 | ||
1185 | if (!wait_for_pid(cpid)) | |
1186 | exit(1); | |
1187 | exit(0); | |
1188 | ||
1189 | again: | |
1190 | kill(cpid, SIGKILL); | |
1191 | wait_for_pid(cpid); | |
1192 | goto loop; | |
1193 | } | |
1194 | ||
1195 | static bool do_write_pids(pid_t tpid, const char *contrl, const char *cg, const char *file, const char *buf) | |
1196 | { | |
1197 | int sock[2] = {-1, -1}; | |
1198 | pid_t qpid, cpid = -1; | |
1199 | bool answer = false, fail = false; | |
1200 | ||
1201 | /* | |
1202 | * write the pids to a socket, have helper in writer's pidns | |
1203 | * call movepid for us | |
1204 | */ | |
1205 | if (socketpair(AF_UNIX, SOCK_DGRAM, 0, sock) < 0) { | |
1206 | perror("socketpair"); | |
1207 | exit(1); | |
1208 | } | |
1209 | ||
1210 | cpid = fork(); | |
1211 | if (cpid == -1) | |
1212 | goto out; | |
1213 | ||
1214 | if (!cpid) // child | |
1215 | pid_from_ns_wrapper(sock[1], tpid); | |
1216 | ||
1217 | const char *ptr = buf; | |
1218 | while (sscanf(ptr, "%d", &qpid) == 1) { | |
1219 | struct ucred cred; | |
1220 | char v; | |
1221 | ||
1222 | if (write(sock[0], &qpid, sizeof(qpid)) != sizeof(qpid)) { | |
1223 | fprintf(stderr, "%s: error writing pid to child: %s\n", | |
1224 | __func__, strerror(errno)); | |
1225 | goto out; | |
1226 | } | |
1227 | ||
1228 | if (recv_creds(sock[0], &cred, &v)) { | |
1229 | if (v == '0') { | |
1230 | if (!cgm_move_pid(contrl, cg, cred.pid)) | |
1231 | fail = true; | |
1232 | } | |
1233 | } | |
1234 | ||
1235 | ptr = strchr(ptr, '\n'); | |
1236 | if (!ptr) | |
1237 | break; | |
1238 | ptr++; | |
1239 | } | |
1240 | ||
1241 | /* All good, write the value */ | |
1242 | qpid = -1; | |
1243 | if (write(sock[0], &qpid ,sizeof(qpid)) != sizeof(qpid)) | |
1244 | fprintf(stderr, "Warning: failed to ask child to exit\n"); | |
1245 | ||
1246 | if (!fail) | |
1247 | answer = true; | |
1248 | ||
1249 | out: | |
1250 | if (cpid != -1) | |
1251 | wait_for_pid(cpid); | |
1252 | if (sock[0] != -1) { | |
1253 | close(sock[0]); | |
1254 | close(sock[1]); | |
1255 | } | |
1256 | return answer; | |
1257 | } | |
1258 | ||
1259 | int cg_write(const char *path, const char *buf, size_t size, off_t offset, | |
1260 | struct fuse_file_info *fi) | |
1261 | { | |
1262 | struct fuse_context *fc = fuse_get_context(); | |
1263 | nih_local char *localbuf = NULL; | |
1264 | nih_local struct cgm_keys *k = NULL; | |
1265 | struct file_info *f = (struct file_info *)fi->fh; | |
1266 | ||
1267 | if (f->type != LXC_TYPE_CGFILE) { | |
1268 | fprintf(stderr, "Internal error: directory cache info used in cg_write\n"); | |
1269 | return -EIO; | |
1270 | } | |
1271 | ||
1272 | if (offset) | |
1273 | return 0; | |
1274 | ||
1275 | if (!fc) | |
1276 | return -EIO; | |
1277 | ||
1278 | localbuf = NIH_MUST( nih_alloc(NULL, size+1) ); | |
1279 | localbuf[size] = '\0'; | |
1280 | memcpy(localbuf, buf, size); | |
1281 | ||
1282 | if ((k = get_cgroup_key(f->controller, f->cgroup, f->file)) != NULL) { | |
1283 | bool r; | |
1284 | ||
1285 | if (!fc_may_access(fc, f->controller, f->cgroup, f->file, O_WRONLY)) | |
1286 | return -EACCES; | |
1287 | ||
1288 | if (strcmp(f->file, "tasks") == 0 || | |
1289 | strcmp(f->file, "/tasks") == 0 || | |
1290 | strcmp(f->file, "/cgroup.procs") == 0 || | |
1291 | strcmp(f->file, "cgroup.procs") == 0) | |
1292 | // special case - we have to translate the pids | |
1293 | r = do_write_pids(fc->pid, f->controller, f->cgroup, f->file, localbuf); | |
1294 | else | |
1295 | r = cgm_set_value(f->controller, f->cgroup, f->file, localbuf); | |
1296 | ||
1297 | if (!r) | |
1298 | return -EINVAL; | |
1299 | ||
1300 | return size; | |
1301 | } | |
1302 | ||
1303 | return -EINVAL; | |
1304 | } | |
1305 | ||
1306 | int cg_chown(const char *path, uid_t uid, gid_t gid) | |
1307 | { | |
1308 | struct fuse_context *fc = fuse_get_context(); | |
1309 | nih_local char * cgdir = NULL; | |
1310 | char *fpath = NULL, *path1, *path2; | |
1311 | nih_local struct cgm_keys *k = NULL; | |
1312 | const char *cgroup; | |
1313 | nih_local char *controller = NULL; | |
1314 | ||
1315 | ||
1316 | if (!fc) | |
1317 | return -EIO; | |
1318 | ||
1319 | if (strcmp(path, "/cgroup") == 0) | |
1320 | return -EINVAL; | |
1321 | ||
1322 | controller = pick_controller_from_path(fc, path); | |
1323 | if (!controller) | |
1324 | return -EINVAL; | |
1325 | cgroup = find_cgroup_in_path(path); | |
1326 | if (!cgroup) | |
1327 | /* this is just /cgroup/controller */ | |
1328 | return -EINVAL; | |
1329 | ||
1330 | get_cgdir_and_path(cgroup, &cgdir, &fpath); | |
1331 | ||
1332 | if (!fpath) { | |
1333 | path1 = "/"; | |
1334 | path2 = cgdir; | |
1335 | } else { | |
1336 | path1 = cgdir; | |
1337 | path2 = fpath; | |
1338 | } | |
1339 | ||
1340 | if (is_child_cgroup(controller, path1, path2)) { | |
1341 | // get uid, gid, from '/tasks' file and make up a mode | |
1342 | // That is a hack, until cgmanager gains a GetCgroupPerms fn. | |
1343 | k = get_cgroup_key(controller, cgroup, "tasks"); | |
1344 | ||
1345 | } else | |
1346 | k = get_cgroup_key(controller, path1, path2); | |
1347 | ||
1348 | if (!k) | |
1349 | return -EINVAL; | |
1350 | ||
1351 | /* | |
1352 | * This being a fuse request, the uid and gid must be valid | |
1353 | * in the caller's namespace. So we can just check to make | |
1354 | * sure that the caller is root in his uid, and privileged | |
1355 | * over the file's current owner. | |
1356 | */ | |
1357 | if (!is_privileged_over(fc->pid, fc->uid, k->uid, NS_ROOT_REQD)) | |
1358 | return -EACCES; | |
1359 | ||
1360 | if (!cgm_chown_file(controller, cgroup, uid, gid)) | |
1361 | return -EINVAL; | |
1362 | return 0; | |
1363 | } | |
1364 | ||
1365 | int cg_chmod(const char *path, mode_t mode) | |
1366 | { | |
1367 | struct fuse_context *fc = fuse_get_context(); | |
1368 | nih_local char * cgdir = NULL; | |
1369 | char *fpath = NULL, *path1, *path2; | |
1370 | nih_local struct cgm_keys *k = NULL; | |
1371 | const char *cgroup; | |
1372 | nih_local char *controller = NULL; | |
1373 | ||
1374 | if (!fc) | |
1375 | return -EIO; | |
1376 | ||
1377 | if (strcmp(path, "/cgroup") == 0) | |
1378 | return -EINVAL; | |
1379 | ||
1380 | controller = pick_controller_from_path(fc, path); | |
1381 | if (!controller) | |
1382 | return -EINVAL; | |
1383 | cgroup = find_cgroup_in_path(path); | |
1384 | if (!cgroup) | |
1385 | /* this is just /cgroup/controller */ | |
1386 | return -EINVAL; | |
1387 | ||
1388 | get_cgdir_and_path(cgroup, &cgdir, &fpath); | |
1389 | ||
1390 | if (!fpath) { | |
1391 | path1 = "/"; | |
1392 | path2 = cgdir; | |
1393 | } else { | |
1394 | path1 = cgdir; | |
1395 | path2 = fpath; | |
1396 | } | |
1397 | ||
1398 | if (is_child_cgroup(controller, path1, path2)) { | |
1399 | // get uid, gid, from '/tasks' file and make up a mode | |
1400 | // That is a hack, until cgmanager gains a GetCgroupPerms fn. | |
1401 | k = get_cgroup_key(controller, cgroup, "tasks"); | |
1402 | ||
1403 | } else | |
1404 | k = get_cgroup_key(controller, path1, path2); | |
1405 | ||
1406 | if (!k) | |
1407 | return -EINVAL; | |
1408 | ||
1409 | /* | |
1410 | * This being a fuse request, the uid and gid must be valid | |
1411 | * in the caller's namespace. So we can just check to make | |
1412 | * sure that the caller is root in his uid, and privileged | |
1413 | * over the file's current owner. | |
1414 | */ | |
1415 | if (!is_privileged_over(fc->pid, fc->uid, k->uid, NS_ROOT_OPT)) | |
1416 | return -EPERM; | |
1417 | ||
1418 | if (!cgm_chmod_file(controller, cgroup, mode)) | |
1419 | return -EINVAL; | |
1420 | return 0; | |
1421 | } | |
1422 | ||
1423 | int cg_mkdir(const char *path, mode_t mode) | |
1424 | { | |
1425 | struct fuse_context *fc = fuse_get_context(); | |
1426 | nih_local struct cgm_keys **list = NULL; | |
1427 | char *fpath = NULL, *path1; | |
1428 | nih_local char * cgdir = NULL; | |
1429 | const char *cgroup; | |
1430 | nih_local char *controller = NULL; | |
1431 | ||
1432 | if (!fc) | |
1433 | return -EIO; | |
1434 | ||
1435 | ||
1436 | controller = pick_controller_from_path(fc, path); | |
1437 | if (!controller) | |
1438 | return -EINVAL; | |
1439 | ||
1440 | cgroup = find_cgroup_in_path(path); | |
1441 | if (!cgroup) | |
1442 | return -EINVAL; | |
1443 | ||
1444 | get_cgdir_and_path(cgroup, &cgdir, &fpath); | |
1445 | if (!fpath) | |
1446 | path1 = "/"; | |
1447 | else | |
1448 | path1 = cgdir; | |
1449 | ||
1450 | if (!fc_may_access(fc, controller, path1, NULL, O_RDWR)) | |
1451 | return -EACCES; | |
1452 | ||
1453 | ||
1454 | if (!cgm_create(controller, cgroup, fc->uid, fc->gid)) | |
1455 | return -EINVAL; | |
1456 | ||
1457 | return 0; | |
1458 | } | |
1459 | ||
1460 | static int cg_rmdir(const char *path) | |
1461 | { | |
1462 | struct fuse_context *fc = fuse_get_context(); | |
1463 | nih_local struct cgm_keys **list = NULL; | |
1464 | char *fpath = NULL; | |
1465 | nih_local char * cgdir = NULL; | |
1466 | const char *cgroup; | |
1467 | nih_local char *controller = NULL; | |
1468 | ||
1469 | if (!fc) | |
1470 | return -EIO; | |
1471 | ||
1472 | ||
1473 | controller = pick_controller_from_path(fc, path); | |
1474 | if (!controller) | |
1475 | return -EINVAL; | |
1476 | ||
1477 | cgroup = find_cgroup_in_path(path); | |
1478 | if (!cgroup) | |
1479 | return -EINVAL; | |
1480 | ||
1481 | get_cgdir_and_path(cgroup, &cgdir, &fpath); | |
1482 | if (!fpath) | |
1483 | return -EINVAL; | |
1484 | ||
1485 | if (!fc_may_access(fc, controller, cgdir, NULL, O_WRONLY)) | |
1486 | return -EACCES; | |
1487 | ||
1488 | if (!cgm_remove(controller, cgroup)) | |
1489 | return -EINVAL; | |
1490 | ||
1491 | return 0; | |
1492 | } | |
1493 | ||
1494 | static bool startswith(const char *line, const char *pref) | |
1495 | { | |
1496 | if (strncmp(line, pref, strlen(pref)) == 0) | |
1497 | return true; | |
1498 | return false; | |
1499 | } | |
1500 | ||
1501 | static void get_mem_cached(char *memstat, unsigned long *v) | |
1502 | { | |
1503 | char *eol; | |
1504 | ||
1505 | *v = 0; | |
1506 | while (*memstat) { | |
1507 | if (startswith(memstat, "total_cache")) { | |
1508 | sscanf(memstat + 11, "%lu", v); | |
1509 | *v /= 1024; | |
1510 | return; | |
1511 | } | |
1512 | eol = strchr(memstat, '\n'); | |
1513 | if (!eol) | |
1514 | return; | |
1515 | memstat = eol+1; | |
1516 | } | |
1517 | } | |
1518 | ||
1519 | static void get_blkio_io_value(char *str, unsigned major, unsigned minor, char *iotype, unsigned long *v) | |
1520 | { | |
1521 | char *eol; | |
1522 | char key[32]; | |
1523 | ||
1524 | memset(key, 0, 32); | |
1525 | snprintf(key, 32, "%u:%u %s", major, minor, iotype); | |
1526 | ||
1527 | size_t len = strlen(key); | |
1528 | *v = 0; | |
1529 | ||
1530 | while (*str) { | |
1531 | if (startswith(str, key)) { | |
1532 | sscanf(str + len, "%lu", v); | |
1533 | return; | |
1534 | } | |
1535 | eol = strchr(str, '\n'); | |
1536 | if (!eol) | |
1537 | return; | |
1538 | str = eol+1; | |
1539 | } | |
1540 | } | |
1541 | ||
1542 | static char *get_pid_cgroup(pid_t pid, const char *contrl) | |
1543 | { | |
1544 | nih_local char *fnam = NULL; | |
1545 | FILE *f; | |
1546 | char *answer = NULL; | |
1547 | char *line = NULL; | |
1548 | size_t len = 0; | |
1549 | ||
1550 | fnam = NIH_MUST( nih_sprintf(NULL, "/proc/%d/cgroup", pid) ); | |
1551 | if (!(f = fopen(fnam, "r"))) | |
1552 | return false; | |
1553 | ||
1554 | while (getline(&line, &len, f) != -1) { | |
1555 | char *c1, *c2; | |
1556 | if (!line[0]) | |
1557 | continue; | |
1558 | c1 = strchr(line, ':'); | |
1559 | if (!c1) | |
1560 | goto out; | |
1561 | c1++; | |
1562 | c2 = strchr(c1, ':'); | |
1563 | if (!c2) | |
1564 | goto out; | |
1565 | *c2 = '\0'; | |
1566 | if (strcmp(c1, contrl) != 0) | |
1567 | continue; | |
1568 | c2++; | |
1569 | stripnewline(c2); | |
1570 | answer = NIH_MUST( nih_strdup(NULL, c2) ); | |
1571 | goto out; | |
1572 | } | |
1573 | ||
1574 | out: | |
1575 | fclose(f); | |
1576 | free(line); | |
1577 | return answer; | |
1578 | } | |
1579 | ||
1580 | /* | |
1581 | * FUSE ops for /proc | |
1582 | */ | |
1583 | ||
1584 | static int proc_meminfo_read(char *buf, size_t size, off_t offset, | |
1585 | struct fuse_file_info *fi) | |
1586 | { | |
1587 | struct fuse_context *fc = fuse_get_context(); | |
1588 | struct file_info *d = (struct file_info *)fi->fh; | |
1589 | nih_local char *cg = get_pid_cgroup(fc->pid, "memory"); | |
1590 | nih_local char *memlimit_str = NULL, *memusage_str = NULL, *memstat_str = NULL; | |
1591 | unsigned long memlimit = 0, memusage = 0, cached = 0, hosttotal = 0; | |
1592 | char *line = NULL; | |
1593 | size_t linelen = 0, total_len = 0; | |
1594 | char *cache = d->buf; | |
1595 | size_t cache_size = d->buflen; | |
1596 | FILE *f; | |
1597 | ||
1598 | if (offset){ | |
1599 | if (offset > d->size) | |
1600 | return -EINVAL; | |
1601 | int left = d->size - offset; | |
1602 | total_len = left > size ? size: left; | |
1603 | memcpy(buf, cache + offset, total_len); | |
1604 | return total_len; | |
1605 | } | |
1606 | ||
1607 | if (!cg) | |
1608 | return 0; | |
1609 | ||
1610 | if (!cgm_get_value("memory", cg, "memory.limit_in_bytes", &memlimit_str)) | |
1611 | return 0; | |
1612 | if (!cgm_get_value("memory", cg, "memory.usage_in_bytes", &memusage_str)) | |
1613 | return 0; | |
1614 | if (!cgm_get_value("memory", cg, "memory.stat", &memstat_str)) | |
1615 | return 0; | |
1616 | memlimit = strtoul(memlimit_str, NULL, 10); | |
1617 | memusage = strtoul(memusage_str, NULL, 10); | |
1618 | memlimit /= 1024; | |
1619 | memusage /= 1024; | |
1620 | get_mem_cached(memstat_str, &cached); | |
1621 | ||
1622 | f = fopen("/proc/meminfo", "r"); | |
1623 | if (!f) | |
1624 | return 0; | |
1625 | ||
1626 | while (getline(&line, &linelen, f) != -1) { | |
1627 | size_t l; | |
1628 | char *printme, lbuf[100]; | |
1629 | ||
1630 | memset(lbuf, 0, 100); | |
1631 | if (startswith(line, "MemTotal:")) { | |
1632 | sscanf(line+14, "%lu", &hosttotal); | |
1633 | if (hosttotal < memlimit) | |
1634 | memlimit = hosttotal; | |
1635 | snprintf(lbuf, 100, "MemTotal: %8lu kB\n", memlimit); | |
1636 | printme = lbuf; | |
1637 | } else if (startswith(line, "MemFree:")) { | |
1638 | snprintf(lbuf, 100, "MemFree: %8lu kB\n", memlimit - memusage); | |
1639 | printme = lbuf; | |
1640 | } else if (startswith(line, "MemAvailable:")) { | |
1641 | snprintf(lbuf, 100, "MemAvailable: %8lu kB\n", memlimit - memusage); | |
1642 | printme = lbuf; | |
1643 | } else if (startswith(line, "Buffers:")) { | |
1644 | snprintf(lbuf, 100, "Buffers: %8lu kB\n", 0UL); | |
1645 | printme = lbuf; | |
1646 | } else if (startswith(line, "Cached:")) { | |
1647 | snprintf(lbuf, 100, "Cached: %8lu kB\n", cached); | |
1648 | printme = lbuf; | |
1649 | } else if (startswith(line, "SwapCached:")) { | |
1650 | snprintf(lbuf, 100, "SwapCached: %8lu kB\n", 0UL); | |
1651 | printme = lbuf; | |
1652 | } else | |
1653 | printme = line; | |
1654 | ||
1655 | l = snprintf(cache, cache_size, "%s", printme); | |
1656 | cache += l; | |
1657 | cache_size -= l; | |
1658 | total_len += l; | |
1659 | } | |
1660 | ||
1661 | d->size = total_len; | |
1662 | if (total_len > size ) total_len = size; | |
1663 | memcpy(buf, d->buf, total_len); | |
1664 | ||
1665 | fclose(f); | |
1666 | free(line); | |
1667 | return total_len; | |
1668 | } | |
1669 | ||
1670 | /* | |
1671 | * Read the cpuset.cpus for cg | |
1672 | * Return the answer in a nih_alloced string | |
1673 | */ | |
1674 | static char *get_cpuset(const char *cg) | |
1675 | { | |
1676 | char *answer; | |
1677 | ||
1678 | if (!cgm_get_value("cpuset", cg, "cpuset.cpus", &answer)) | |
1679 | return NULL; | |
1680 | return answer; | |
1681 | } | |
1682 | ||
1683 | /* | |
1684 | * Helper functions for cpuset_in-set | |
1685 | */ | |
1686 | char *cpuset_nexttok(const char *c) | |
1687 | { | |
1688 | char *r = strchr(c+1, ','); | |
1689 | if (r) | |
1690 | return r+1; | |
1691 | return NULL; | |
1692 | } | |
1693 | ||
1694 | int cpuset_getrange(const char *c, int *a, int *b) | |
1695 | { | |
1696 | int ret; | |
1697 | ||
1698 | ret = sscanf(c, "%d-%d", a, b); | |
1699 | return ret; | |
1700 | } | |
1701 | ||
1702 | /* | |
1703 | * cpusets are in format "1,2-3,4" | |
1704 | * iow, comma-delimited ranges | |
1705 | */ | |
1706 | static bool cpu_in_cpuset(int cpu, const char *cpuset) | |
1707 | { | |
1708 | const char *c; | |
1709 | ||
1710 | for (c = cpuset; c; c = cpuset_nexttok(c)) { | |
1711 | int a, b, ret; | |
1712 | ||
1713 | ret = cpuset_getrange(c, &a, &b); | |
1714 | if (ret == 1 && cpu == a) | |
1715 | return true; | |
1716 | if (ret != 2) // bad cpuset! | |
1717 | return false; | |
1718 | if (cpu >= a && cpu <= b) | |
1719 | return true; | |
1720 | } | |
1721 | ||
1722 | return false; | |
1723 | } | |
1724 | ||
1725 | static bool cpuline_in_cpuset(const char *line, const char *cpuset) | |
1726 | { | |
1727 | int cpu; | |
1728 | ||
1729 | if (sscanf(line, "processor : %d", &cpu) != 1) | |
1730 | return false; | |
1731 | return cpu_in_cpuset(cpu, cpuset); | |
1732 | } | |
1733 | ||
1734 | /* | |
1735 | * check whether this is a '^processor" line in /proc/cpuinfo | |
1736 | */ | |
1737 | static bool is_processor_line(const char *line) | |
1738 | { | |
1739 | int cpu; | |
1740 | ||
1741 | if (sscanf(line, "processor : %d", &cpu) == 1) | |
1742 | return true; | |
1743 | return false; | |
1744 | } | |
1745 | ||
1746 | static int proc_cpuinfo_read(char *buf, size_t size, off_t offset, | |
1747 | struct fuse_file_info *fi) | |
1748 | { | |
1749 | struct fuse_context *fc = fuse_get_context(); | |
1750 | struct file_info *d = (struct file_info *)fi->fh; | |
1751 | nih_local char *cg = get_pid_cgroup(fc->pid, "cpuset"); | |
1752 | nih_local char *cpuset = NULL; | |
1753 | char *line = NULL; | |
1754 | size_t linelen = 0, total_len = 0; | |
1755 | bool am_printing = false; | |
1756 | int curcpu = -1; | |
1757 | char *cache = d->buf; | |
1758 | size_t cache_size = d->buflen; | |
1759 | FILE *f; | |
1760 | ||
1761 | if (offset){ | |
1762 | if (offset > d->size) | |
1763 | return -EINVAL; | |
1764 | int left = d->size - offset; | |
1765 | total_len = left > size ? size: left; | |
1766 | memcpy(buf, cache + offset, total_len); | |
1767 | return total_len; | |
1768 | } | |
1769 | ||
1770 | if (!cg) | |
1771 | return 0; | |
1772 | ||
1773 | cpuset = get_cpuset(cg); | |
1774 | if (!cpuset) | |
1775 | return 0; | |
1776 | ||
1777 | f = fopen("/proc/cpuinfo", "r"); | |
1778 | if (!f) | |
1779 | return 0; | |
1780 | ||
1781 | while (getline(&line, &linelen, f) != -1) { | |
1782 | size_t l; | |
1783 | if (is_processor_line(line)) { | |
1784 | am_printing = cpuline_in_cpuset(line, cpuset); | |
1785 | if (am_printing) { | |
1786 | curcpu ++; | |
1787 | l = snprintf(cache, cache_size, "processor : %d\n", curcpu); | |
1788 | if (l < cache_size){ | |
1789 | cache += l; | |
1790 | cache_size -= l; | |
1791 | total_len += l; | |
1792 | }else{ | |
1793 | cache += cache_size; | |
1794 | total_len += cache_size; | |
1795 | cache_size = 0; | |
1796 | break; | |
1797 | } | |
1798 | } | |
1799 | continue; | |
1800 | } | |
1801 | if (am_printing) { | |
1802 | l = snprintf(cache, cache_size, "%s", line); | |
1803 | if (l < cache_size) { | |
1804 | cache += l; | |
1805 | cache_size -= l; | |
1806 | total_len += l; | |
1807 | } else { | |
1808 | cache += cache_size; | |
1809 | total_len += cache_size; | |
1810 | cache_size = 0; | |
1811 | break; | |
1812 | } | |
1813 | } | |
1814 | } | |
1815 | ||
1816 | d->size = total_len; | |
1817 | if (total_len > size ) total_len = size; | |
1818 | ||
1819 | /* read from off 0 */ | |
1820 | memcpy(buf, d->buf, total_len); | |
1821 | ||
1822 | fclose(f); | |
1823 | free(line); | |
1824 | return total_len; | |
1825 | } | |
1826 | ||
1827 | static int proc_stat_read(char *buf, size_t size, off_t offset, | |
1828 | struct fuse_file_info *fi) | |
1829 | { | |
1830 | struct fuse_context *fc = fuse_get_context(); | |
1831 | struct file_info *d = (struct file_info *)fi->fh; | |
1832 | nih_local char *cg = get_pid_cgroup(fc->pid, "cpuset"); | |
1833 | nih_local char *cpuset = NULL; | |
1834 | char *line = NULL; | |
1835 | size_t linelen = 0, total_len = 0; | |
1836 | int curcpu = -1; /* cpu numbering starts at 0 */ | |
1837 | unsigned long user = 0, nice = 0, system = 0, idle = 0, iowait = 0, irq = 0, softirq = 0, steal = 0, guest = 0; | |
1838 | unsigned long user_sum = 0, nice_sum = 0, system_sum = 0, idle_sum = 0, iowait_sum = 0, | |
1839 | irq_sum = 0, softirq_sum = 0, steal_sum = 0, guest_sum = 0; | |
1840 | #define CPUALL_MAX_SIZE BUF_RESERVE_SIZE | |
1841 | char cpuall[CPUALL_MAX_SIZE]; | |
1842 | /* reserve for cpu all */ | |
1843 | char *cache = d->buf + CPUALL_MAX_SIZE; | |
1844 | size_t cache_size = d->buflen - CPUALL_MAX_SIZE; | |
1845 | FILE *f; | |
1846 | ||
1847 | if (offset){ | |
1848 | if (offset > d->size) | |
1849 | return -EINVAL; | |
1850 | int left = d->size - offset; | |
1851 | total_len = left > size ? size: left; | |
1852 | memcpy(buf, d->buf + offset, total_len); | |
1853 | return total_len; | |
1854 | } | |
1855 | ||
1856 | if (!cg) | |
1857 | return 0; | |
1858 | ||
1859 | cpuset = get_cpuset(cg); | |
1860 | if (!cpuset) | |
1861 | return 0; | |
1862 | ||
1863 | f = fopen("/proc/stat", "r"); | |
1864 | if (!f) | |
1865 | return 0; | |
1866 | ||
1867 | //skip first line | |
1868 | if (getline(&line, &linelen, f) < 0) { | |
1869 | fprintf(stderr, "proc_stat_read read first line failed\n"); | |
1870 | goto out; | |
1871 | } | |
1872 | ||
1873 | while (getline(&line, &linelen, f) != -1) { | |
1874 | size_t l; | |
1875 | int cpu; | |
1876 | char cpu_char[10]; /* That's a lot of cores */ | |
1877 | char *c; | |
1878 | ||
1879 | if (sscanf(line, "cpu%9[^ ]", cpu_char) != 1) { | |
1880 | /* not a ^cpuN line containing a number N, just print it */ | |
1881 | l = snprintf(cache, cache_size, "%s", line); | |
1882 | if (l < cache_size){ | |
1883 | cache += l; | |
1884 | cache_size -= l; | |
1885 | total_len += l; | |
1886 | continue; | |
1887 | }else{ | |
1888 | //no more space, break it | |
1889 | cache += cache_size; | |
1890 | total_len += cache_size; | |
1891 | cache_size = 0; | |
1892 | break; | |
1893 | } | |
1894 | } | |
1895 | ||
1896 | if (sscanf(cpu_char, "%d", &cpu) != 1) | |
1897 | continue; | |
1898 | if (!cpu_in_cpuset(cpu, cpuset)) | |
1899 | continue; | |
1900 | curcpu ++; | |
1901 | ||
1902 | c = strchr(line, ' '); | |
1903 | if (!c) | |
1904 | continue; | |
1905 | l = snprintf(cache, cache_size, "cpu%d%s", curcpu, c); | |
1906 | cache += l; | |
1907 | cache_size -= l; | |
1908 | total_len += l; | |
1909 | ||
1910 | if (sscanf(line, "%*s %lu %lu %lu %lu %lu %lu %lu %lu %lu", &user, &nice, &system, &idle, &iowait, &irq, | |
1911 | &softirq, &steal, &guest) != 9) | |
1912 | continue; | |
1913 | user_sum += user; | |
1914 | nice_sum += nice; | |
1915 | system_sum += system; | |
1916 | idle_sum += idle; | |
1917 | iowait_sum += iowait; | |
1918 | irq_sum += irq; | |
1919 | softirq_sum += softirq; | |
1920 | steal_sum += steal; | |
1921 | guest_sum += guest; | |
1922 | } | |
1923 | ||
1924 | cache = d->buf; | |
1925 | ||
1926 | int cpuall_len = snprintf(cpuall, CPUALL_MAX_SIZE, "%s %lu %lu %lu %lu %lu %lu %lu %lu %lu\n", | |
1927 | "cpu ", user_sum, nice_sum, system_sum, idle_sum, iowait_sum, irq_sum, softirq_sum, steal_sum, guest_sum); | |
1928 | if (cpuall_len > 0 && cpuall_len < CPUALL_MAX_SIZE){ | |
1929 | memcpy(cache, cpuall, cpuall_len); | |
1930 | cache += cpuall_len; | |
1931 | }else{ | |
1932 | /* shouldn't happen */ | |
1933 | fprintf(stderr, "proc_stat_read copy cpuall failed, cpuall_len=%d\n", cpuall_len); | |
1934 | cpuall_len = 0; | |
1935 | } | |
1936 | ||
1937 | memmove(cache, d->buf + CPUALL_MAX_SIZE, total_len); | |
1938 | total_len += cpuall_len; | |
1939 | d->size = total_len; | |
1940 | if (total_len > size ) total_len = size; | |
1941 | ||
1942 | memcpy(buf, d->buf, total_len); | |
1943 | out: | |
1944 | fclose(f); | |
1945 | free(line); | |
1946 | return total_len; | |
1947 | } | |
1948 | ||
1949 | /* | |
1950 | * How to guess what to present for uptime? | |
1951 | * One thing we could do would be to take the date on the caller's | |
1952 | * memory.usage_in_bytes file, which should equal the time of creation | |
1953 | * of his cgroup. However, a task could be in a sub-cgroup of the | |
1954 | * container. The same problem exists if we try to look at the ages | |
1955 | * of processes in the caller's cgroup. | |
1956 | * | |
1957 | * So we'll fork a task that will enter the caller's pidns, mount a | |
1958 | * fresh procfs, get the age of /proc/1, and pass that back over a pipe. | |
1959 | * | |
1960 | * For the second uptime #, we'll do as Stéphane had done, just copy | |
1961 | * the number from /proc/uptime. Not sure how to best emulate 'idle' | |
1962 | * time. Maybe someone can come up with a good algorithm and submit a | |
1963 | * patch. Maybe something based on cpushare info? | |
1964 | */ | |
1965 | ||
1966 | /* return age of the reaper for $pid, taken from ctime of its procdir */ | |
1967 | static long int get_pid1_time(pid_t pid) | |
1968 | { | |
1969 | char fnam[100]; | |
1970 | int fd, cpipe[2], ret; | |
1971 | struct stat sb; | |
1972 | pid_t cpid; | |
1973 | struct timeval tv; | |
1974 | fd_set s; | |
1975 | char v; | |
1976 | ||
1977 | if (unshare(CLONE_NEWNS)) | |
1978 | return 0; | |
1979 | ||
1980 | if (mount(NULL, "/", NULL, MS_SLAVE|MS_REC, NULL)) { | |
1981 | perror("rslave mount failed"); | |
1982 | return 0; | |
1983 | } | |
1984 | ||
1985 | sprintf(fnam, "/proc/%d/ns/pid", pid); | |
1986 | fd = open(fnam, O_RDONLY); | |
1987 | if (fd < 0) { | |
1988 | perror("get_pid1_time open of ns/pid"); | |
1989 | return 0; | |
1990 | } | |
1991 | if (setns(fd, 0)) { | |
1992 | perror("get_pid1_time setns 1"); | |
1993 | close(fd); | |
1994 | return 0; | |
1995 | } | |
1996 | close(fd); | |
1997 | ||
1998 | if (pipe(cpipe) < 0) | |
1999 | exit(1); | |
2000 | ||
2001 | loop: | |
2002 | cpid = fork(); | |
2003 | if (cpid < 0) | |
2004 | return 0; | |
2005 | ||
2006 | if (!cpid) { | |
2007 | char b = '1'; | |
2008 | close(cpipe[0]); | |
2009 | if (write(cpipe[1], &b, sizeof(char)) < 0) { | |
2010 | fprintf(stderr, "%s (child): erorr on write: %s\n", | |
2011 | __func__, strerror(errno)); | |
2012 | } | |
2013 | close(cpipe[1]); | |
2014 | umount2("/proc", MNT_DETACH); | |
2015 | if (mount("proc", "/proc", "proc", 0, NULL)) { | |
2016 | perror("get_pid1_time mount"); | |
2017 | return 0; | |
2018 | } | |
2019 | ret = lstat("/proc/1", &sb); | |
2020 | if (ret) { | |
2021 | perror("get_pid1_time lstat"); | |
2022 | return 0; | |
2023 | } | |
2024 | return time(NULL) - sb.st_ctime; | |
2025 | } | |
2026 | ||
2027 | // give the child 1 second to be done forking and | |
2028 | // write it's ack | |
2029 | FD_ZERO(&s); | |
2030 | FD_SET(cpipe[0], &s); | |
2031 | tv.tv_sec = 1; | |
2032 | tv.tv_usec = 0; | |
2033 | ret = select(cpipe[0]+1, &s, NULL, NULL, &tv); | |
2034 | if (ret <= 0) | |
2035 | goto again; | |
2036 | ret = read(cpipe[0], &v, 1); | |
2037 | if (ret != sizeof(char) || v != '1') { | |
2038 | goto again; | |
2039 | } | |
2040 | ||
2041 | wait_for_pid(cpid); | |
2042 | exit(0); | |
2043 | ||
2044 | again: | |
2045 | kill(cpid, SIGKILL); | |
2046 | wait_for_pid(cpid); | |
2047 | goto loop; | |
2048 | } | |
2049 | ||
2050 | static long int getreaperage(pid_t qpid) | |
2051 | { | |
2052 | int pid, mypipe[2], ret; | |
2053 | struct timeval tv; | |
2054 | fd_set s; | |
2055 | long int mtime, answer = 0; | |
2056 | ||
2057 | if (pipe(mypipe)) { | |
2058 | return 0; | |
2059 | } | |
2060 | ||
2061 | pid = fork(); | |
2062 | ||
2063 | if (!pid) { // child | |
2064 | mtime = get_pid1_time(qpid); | |
2065 | if (write(mypipe[1], &mtime, sizeof(mtime)) != sizeof(mtime)) | |
2066 | fprintf(stderr, "Warning: bad write from getreaperage\n"); | |
2067 | exit(0); | |
2068 | } | |
2069 | ||
2070 | close(mypipe[1]); | |
2071 | FD_ZERO(&s); | |
2072 | FD_SET(mypipe[0], &s); | |
2073 | tv.tv_sec = 1; | |
2074 | tv.tv_usec = 0; | |
2075 | ret = select(mypipe[0]+1, &s, NULL, NULL, &tv); | |
2076 | if (ret <= 0) { | |
2077 | perror("select"); | |
2078 | goto out; | |
2079 | } | |
2080 | if (!ret) { | |
2081 | fprintf(stderr, "timed out\n"); | |
2082 | goto out; | |
2083 | } | |
2084 | if (read(mypipe[0], &mtime, sizeof(mtime)) != sizeof(mtime)) { | |
2085 | perror("read"); | |
2086 | goto out; | |
2087 | } | |
2088 | answer = mtime; | |
2089 | ||
2090 | out: | |
2091 | wait_for_pid(pid); | |
2092 | close(mypipe[0]); | |
2093 | return answer; | |
2094 | } | |
2095 | ||
2096 | static long int getprocidle(void) | |
2097 | { | |
2098 | FILE *f = fopen("/proc/uptime", "r"); | |
2099 | long int age, idle; | |
2100 | int ret; | |
2101 | if (!f) | |
2102 | return 0; | |
2103 | ret = fscanf(f, "%ld %ld", &age, &idle); | |
2104 | fclose(f); | |
2105 | if (ret != 2) | |
2106 | return 0; | |
2107 | return idle; | |
2108 | } | |
2109 | ||
2110 | /* | |
2111 | * We read /proc/uptime and reuse its second field. | |
2112 | * For the first field, we use the mtime for the reaper for | |
2113 | * the calling pid as returned by getreaperage | |
2114 | */ | |
2115 | static int proc_uptime_read(char *buf, size_t size, off_t offset, | |
2116 | struct fuse_file_info *fi) | |
2117 | { | |
2118 | struct fuse_context *fc = fuse_get_context(); | |
2119 | struct file_info *d = (struct file_info *)fi->fh; | |
2120 | long int reaperage = getreaperage(fc->pid);; | |
2121 | long int idletime = getprocidle(); | |
2122 | size_t total_len = 0; | |
2123 | ||
2124 | if (offset){ | |
2125 | if (offset > d->size) | |
2126 | return -EINVAL; | |
2127 | return 0; | |
2128 | } | |
2129 | ||
2130 | total_len = snprintf(buf, size, "%ld %ld\n", reaperage, idletime); | |
2131 | d->size = total_len; | |
2132 | return total_len; | |
2133 | } | |
2134 | ||
2135 | static int proc_diskstats_read(char *buf, size_t size, off_t offset, | |
2136 | struct fuse_file_info *fi) | |
2137 | { | |
2138 | char dev_name[72]; | |
2139 | struct fuse_context *fc = fuse_get_context(); | |
2140 | struct file_info *d = (struct file_info *)fi->fh; | |
2141 | nih_local char *cg = get_pid_cgroup(fc->pid, "blkio"); | |
2142 | nih_local char *io_serviced_str = NULL, *io_merged_str = NULL, *io_service_bytes_str = NULL, | |
2143 | *io_wait_time_str = NULL, *io_service_time_str = NULL; | |
2144 | unsigned long read = 0, write = 0; | |
2145 | unsigned long read_merged = 0, write_merged = 0; | |
2146 | unsigned long read_sectors = 0, write_sectors = 0; | |
2147 | unsigned long read_ticks = 0, write_ticks = 0; | |
2148 | unsigned long ios_pgr = 0, tot_ticks = 0, rq_ticks = 0; | |
2149 | unsigned long rd_svctm = 0, wr_svctm = 0, rd_wait = 0, wr_wait = 0; | |
2150 | char *line = NULL; | |
2151 | size_t linelen = 0, total_len = 0; | |
2152 | unsigned int major = 0, minor = 0; | |
2153 | int i = 0; | |
2154 | FILE *f; | |
2155 | ||
2156 | if (offset){ | |
2157 | if (offset > d->size) | |
2158 | return -EINVAL; | |
2159 | return 0; | |
2160 | } | |
2161 | ||
2162 | if (!cg) | |
2163 | return 0; | |
2164 | ||
2165 | if (!cgm_get_value("blkio", cg, "blkio.io_serviced", &io_serviced_str)) | |
2166 | return 0; | |
2167 | if (!cgm_get_value("blkio", cg, "blkio.io_merged", &io_merged_str)) | |
2168 | return 0; | |
2169 | if (!cgm_get_value("blkio", cg, "blkio.io_service_bytes", &io_service_bytes_str)) | |
2170 | return 0; | |
2171 | if (!cgm_get_value("blkio", cg, "blkio.io_wait_time", &io_wait_time_str)) | |
2172 | return 0; | |
2173 | if (!cgm_get_value("blkio", cg, "blkio.io_service_time", &io_service_time_str)) | |
2174 | return 0; | |
2175 | ||
2176 | ||
2177 | f = fopen("/proc/diskstats", "r"); | |
2178 | if (!f) | |
2179 | return 0; | |
2180 | ||
2181 | while (getline(&line, &linelen, f) != -1) { | |
2182 | size_t l; | |
2183 | char *printme, lbuf[256]; | |
2184 | ||
2185 | i = sscanf(line, "%u %u %s", &major, &minor, dev_name); | |
2186 | if(i == 3){ | |
2187 | get_blkio_io_value(io_serviced_str, major, minor, "Read", &read); | |
2188 | get_blkio_io_value(io_serviced_str, major, minor, "Write", &write); | |
2189 | get_blkio_io_value(io_merged_str, major, minor, "Read", &read_merged); | |
2190 | get_blkio_io_value(io_merged_str, major, minor, "Write", &write_merged); | |
2191 | get_blkio_io_value(io_service_bytes_str, major, minor, "Read", &read_sectors); | |
2192 | read_sectors = read_sectors/512; | |
2193 | get_blkio_io_value(io_service_bytes_str, major, minor, "Write", &write_sectors); | |
2194 | write_sectors = write_sectors/512; | |
2195 | ||
2196 | get_blkio_io_value(io_service_time_str, major, minor, "Read", &rd_svctm); | |
2197 | rd_svctm = rd_svctm/1000000; | |
2198 | get_blkio_io_value(io_wait_time_str, major, minor, "Read", &rd_wait); | |
2199 | rd_wait = rd_wait/1000000; | |
2200 | read_ticks = rd_svctm + rd_wait; | |
2201 | ||
2202 | get_blkio_io_value(io_service_time_str, major, minor, "Write", &wr_svctm); | |
2203 | wr_svctm = wr_svctm/1000000; | |
2204 | get_blkio_io_value(io_wait_time_str, major, minor, "Write", &wr_wait); | |
2205 | wr_wait = wr_wait/1000000; | |
2206 | write_ticks = wr_svctm + wr_wait; | |
2207 | ||
2208 | get_blkio_io_value(io_service_time_str, major, minor, "Total", &tot_ticks); | |
2209 | tot_ticks = tot_ticks/1000000; | |
2210 | }else{ | |
2211 | continue; | |
2212 | } | |
2213 | ||
2214 | memset(lbuf, 0, 256); | |
2215 | if (read || write || read_merged || write_merged || read_sectors || write_sectors || read_ticks || write_ticks) { | |
2216 | snprintf(lbuf, 256, "%u %u %s %lu %lu %lu %lu %lu %lu %lu %lu %lu %lu %lu\n", | |
2217 | major, minor, dev_name, read, read_merged, read_sectors, read_ticks, | |
2218 | write, write_merged, write_sectors, write_ticks, ios_pgr, tot_ticks, rq_ticks); | |
2219 | printme = lbuf; | |
2220 | } else | |
2221 | continue; | |
2222 | ||
2223 | l = snprintf(buf, size, "%s", printme); | |
2224 | buf += l; | |
2225 | size -= l; | |
2226 | total_len += l; | |
2227 | } | |
2228 | ||
2229 | d->size = total_len; | |
2230 | ||
2231 | fclose(f); | |
2232 | free(line); | |
2233 | return total_len; | |
2234 | } | |
2235 | ||
2236 | static off_t get_procfile_size(const char *which) | |
2237 | { | |
2238 | FILE *f = fopen(which, "r"); | |
2239 | char *line = NULL; | |
2240 | size_t len = 0; | |
2241 | ssize_t sz, answer = 0; | |
2242 | if (!f) | |
2243 | return 0; | |
2244 | ||
2245 | while ((sz = getline(&line, &len, f)) != -1) | |
2246 | answer += sz; | |
2247 | fclose (f); | |
2248 | free(line); | |
2249 | ||
2250 | return answer; | |
2251 | } | |
2252 | ||
2253 | static int proc_getattr(const char *path, struct stat *sb) | |
2254 | { | |
2255 | struct timespec now; | |
2256 | ||
2257 | memset(sb, 0, sizeof(struct stat)); | |
2258 | if (clock_gettime(CLOCK_REALTIME, &now) < 0) | |
2259 | return -EINVAL; | |
2260 | sb->st_uid = sb->st_gid = 0; | |
2261 | sb->st_atim = sb->st_mtim = sb->st_ctim = now; | |
2262 | if (strcmp(path, "/proc") == 0) { | |
2263 | sb->st_mode = S_IFDIR | 00555; | |
2264 | sb->st_nlink = 2; | |
2265 | return 0; | |
2266 | } | |
2267 | if (strcmp(path, "/proc/meminfo") == 0 || | |
2268 | strcmp(path, "/proc/cpuinfo") == 0 || | |
2269 | strcmp(path, "/proc/uptime") == 0 || | |
2270 | strcmp(path, "/proc/stat") == 0 || | |
2271 | strcmp(path, "/proc/diskstats") == 0) { | |
2272 | sb->st_size = 0; | |
2273 | sb->st_mode = S_IFREG | 00444; | |
2274 | sb->st_nlink = 1; | |
2275 | return 0; | |
2276 | } | |
2277 | ||
2278 | return -ENOENT; | |
2279 | } | |
2280 | ||
2281 | static int proc_readdir(const char *path, void *buf, fuse_fill_dir_t filler, off_t offset, | |
2282 | struct fuse_file_info *fi) | |
2283 | { | |
2284 | if (filler(buf, "cpuinfo", NULL, 0) != 0 || | |
2285 | filler(buf, "meminfo", NULL, 0) != 0 || | |
2286 | filler(buf, "stat", NULL, 0) != 0 || | |
2287 | filler(buf, "uptime", NULL, 0) != 0 || | |
2288 | filler(buf, "diskstats", NULL, 0) != 0) | |
2289 | return -EINVAL; | |
2290 | return 0; | |
2291 | } | |
2292 | ||
2293 | static int proc_open(const char *path, struct fuse_file_info *fi) | |
2294 | { | |
2295 | int type = -1; | |
2296 | struct file_info *info; | |
2297 | ||
2298 | if (strcmp(path, "/proc/meminfo") == 0) | |
2299 | type = LXC_TYPE_PROC_MEMINFO; | |
2300 | else if (strcmp(path, "/proc/cpuinfo") == 0) | |
2301 | type = LXC_TYPE_PROC_CPUINFO; | |
2302 | else if (strcmp(path, "/proc/uptime") == 0) | |
2303 | type = LXC_TYPE_PROC_UPTIME; | |
2304 | else if (strcmp(path, "/proc/stat") == 0) | |
2305 | type = LXC_TYPE_PROC_STAT; | |
2306 | else if (strcmp(path, "/proc/diskstats") == 0) | |
2307 | type = LXC_TYPE_PROC_DISKSTATS; | |
2308 | if (type == -1) | |
2309 | return -ENOENT; | |
2310 | ||
2311 | info = NIH_MUST( nih_alloc(NULL, sizeof(*info)) ); | |
2312 | memset(info, 0, sizeof(*info)); | |
2313 | info->type = type; | |
2314 | ||
2315 | info->buflen = get_procfile_size(path) + BUF_RESERVE_SIZE; | |
2316 | info->buf = NIH_MUST( nih_alloc(info, info->buflen) ); | |
2317 | memset(info->buf, 0, info->buflen); | |
2318 | /* set actual size to buffer size */ | |
2319 | info->size = info->buflen; | |
2320 | ||
2321 | fi->fh = (unsigned long)info; | |
2322 | return 0; | |
2323 | } | |
2324 | ||
2325 | static int proc_release(const char *path, struct fuse_file_info *fi) | |
2326 | { | |
2327 | struct file_info *f = (struct file_info *)fi->fh; | |
2328 | ||
2329 | do_release_file_info(f); | |
2330 | return 0; | |
2331 | } | |
2332 | ||
2333 | static int proc_read(const char *path, char *buf, size_t size, off_t offset, | |
2334 | struct fuse_file_info *fi) | |
2335 | { | |
2336 | struct file_info *f = (struct file_info *) fi->fh; | |
2337 | ||
2338 | switch (f->type) { | |
2339 | case LXC_TYPE_PROC_MEMINFO: | |
2340 | return proc_meminfo_read(buf, size, offset, fi); | |
2341 | case LXC_TYPE_PROC_CPUINFO: | |
2342 | return proc_cpuinfo_read(buf, size, offset, fi); | |
2343 | case LXC_TYPE_PROC_UPTIME: | |
2344 | return proc_uptime_read(buf, size, offset, fi); | |
2345 | case LXC_TYPE_PROC_STAT: | |
2346 | return proc_stat_read(buf, size, offset, fi); | |
2347 | case LXC_TYPE_PROC_DISKSTATS: | |
2348 | return proc_diskstats_read(buf, size, offset, fi); | |
2349 | default: | |
2350 | return -EINVAL; | |
2351 | } | |
2352 | } | |
2353 | ||
2354 | /* | |
2355 | * FUSE ops for / | |
2356 | * these just delegate to the /proc and /cgroup ops as | |
2357 | * needed | |
2358 | */ | |
2359 | ||
2360 | static int lxcfs_getattr(const char *path, struct stat *sb) | |
2361 | { | |
2362 | if (strcmp(path, "/") == 0) { | |
2363 | sb->st_mode = S_IFDIR | 00755; | |
2364 | sb->st_nlink = 2; | |
2365 | return 0; | |
2366 | } | |
2367 | if (strncmp(path, "/cgroup", 7) == 0) { | |
2368 | return cg_getattr(path, sb); | |
2369 | } | |
2370 | if (strncmp(path, "/proc", 5) == 0) { | |
2371 | return proc_getattr(path, sb); | |
2372 | } | |
2373 | return -EINVAL; | |
2374 | } | |
2375 | ||
2376 | static int lxcfs_opendir(const char *path, struct fuse_file_info *fi) | |
2377 | { | |
2378 | if (strcmp(path, "/") == 0) | |
2379 | return 0; | |
2380 | ||
2381 | if (strncmp(path, "/cgroup", 7) == 0) { | |
2382 | return cg_opendir(path, fi); | |
2383 | } | |
2384 | if (strcmp(path, "/proc") == 0) | |
2385 | return 0; | |
2386 | return -ENOENT; | |
2387 | } | |
2388 | ||
2389 | static int lxcfs_readdir(const char *path, void *buf, fuse_fill_dir_t filler, off_t offset, | |
2390 | struct fuse_file_info *fi) | |
2391 | { | |
2392 | if (strcmp(path, "/") == 0) { | |
2393 | if (filler(buf, "proc", NULL, 0) != 0 || | |
2394 | filler(buf, "cgroup", NULL, 0) != 0) | |
2395 | return -EINVAL; | |
2396 | return 0; | |
2397 | } | |
2398 | if (strncmp(path, "/cgroup", 7) == 0) | |
2399 | return cg_readdir(path, buf, filler, offset, fi); | |
2400 | if (strcmp(path, "/proc") == 0) | |
2401 | return proc_readdir(path, buf, filler, offset, fi); | |
2402 | return -EINVAL; | |
2403 | } | |
2404 | ||
2405 | static int lxcfs_releasedir(const char *path, struct fuse_file_info *fi) | |
2406 | { | |
2407 | if (strcmp(path, "/") == 0) | |
2408 | return 0; | |
2409 | if (strncmp(path, "/cgroup", 7) == 0) { | |
2410 | return cg_releasedir(path, fi); | |
2411 | } | |
2412 | if (strcmp(path, "/proc") == 0) | |
2413 | return 0; | |
2414 | return -EINVAL; | |
2415 | } | |
2416 | ||
2417 | static int lxcfs_open(const char *path, struct fuse_file_info *fi) | |
2418 | { | |
2419 | if (strncmp(path, "/cgroup", 7) == 0) | |
2420 | return cg_open(path, fi); | |
2421 | if (strncmp(path, "/proc", 5) == 0) | |
2422 | return proc_open(path, fi); | |
2423 | ||
2424 | return -EINVAL; | |
2425 | } | |
2426 | ||
2427 | static int lxcfs_read(const char *path, char *buf, size_t size, off_t offset, | |
2428 | struct fuse_file_info *fi) | |
2429 | { | |
2430 | if (strncmp(path, "/cgroup", 7) == 0) | |
2431 | return cg_read(path, buf, size, offset, fi); | |
2432 | if (strncmp(path, "/proc", 5) == 0) | |
2433 | return proc_read(path, buf, size, offset, fi); | |
2434 | ||
2435 | return -EINVAL; | |
2436 | } | |
2437 | ||
2438 | int lxcfs_write(const char *path, const char *buf, size_t size, off_t offset, | |
2439 | struct fuse_file_info *fi) | |
2440 | { | |
2441 | if (strncmp(path, "/cgroup", 7) == 0) { | |
2442 | return cg_write(path, buf, size, offset, fi); | |
2443 | } | |
2444 | ||
2445 | return -EINVAL; | |
2446 | } | |
2447 | ||
2448 | static int lxcfs_flush(const char *path, struct fuse_file_info *fi) | |
2449 | { | |
2450 | return 0; | |
2451 | } | |
2452 | ||
2453 | static int lxcfs_release(const char *path, struct fuse_file_info *fi) | |
2454 | { | |
2455 | if (strncmp(path, "/cgroup", 7) == 0) | |
2456 | return cg_release(path, fi); | |
2457 | if (strncmp(path, "/proc", 5) == 0) | |
2458 | return proc_release(path, fi); | |
2459 | ||
2460 | return -EINVAL; | |
2461 | } | |
2462 | ||
2463 | static int lxcfs_fsync(const char *path, int datasync, struct fuse_file_info *fi) | |
2464 | { | |
2465 | return 0; | |
2466 | } | |
2467 | ||
2468 | int lxcfs_mkdir(const char *path, mode_t mode) | |
2469 | { | |
2470 | if (strncmp(path, "/cgroup", 7) == 0) | |
2471 | return cg_mkdir(path, mode); | |
2472 | ||
2473 | return -EINVAL; | |
2474 | } | |
2475 | ||
2476 | int lxcfs_chown(const char *path, uid_t uid, gid_t gid) | |
2477 | { | |
2478 | if (strncmp(path, "/cgroup", 7) == 0) | |
2479 | return cg_chown(path, uid, gid); | |
2480 | ||
2481 | return -EINVAL; | |
2482 | } | |
2483 | ||
2484 | /* | |
2485 | * cat first does a truncate before doing ops->write. This doesn't | |
2486 | * really make sense for cgroups. So just return 0 always but do | |
2487 | * nothing. | |
2488 | */ | |
2489 | int lxcfs_truncate(const char *path, off_t newsize) | |
2490 | { | |
2491 | if (strncmp(path, "/cgroup", 7) == 0) | |
2492 | return 0; | |
2493 | return -EINVAL; | |
2494 | } | |
2495 | ||
2496 | int lxcfs_rmdir(const char *path) | |
2497 | { | |
2498 | if (strncmp(path, "/cgroup", 7) == 0) | |
2499 | return cg_rmdir(path); | |
2500 | return -EINVAL; | |
2501 | } | |
2502 | ||
2503 | int lxcfs_chmod(const char *path, mode_t mode) | |
2504 | { | |
2505 | if (strncmp(path, "/cgroup", 7) == 0) | |
2506 | return cg_chmod(path, mode); | |
2507 | return -EINVAL; | |
2508 | } | |
2509 | ||
2510 | const struct fuse_operations lxcfs_ops = { | |
2511 | .getattr = lxcfs_getattr, | |
2512 | .readlink = NULL, | |
2513 | .getdir = NULL, | |
2514 | .mknod = NULL, | |
2515 | .mkdir = lxcfs_mkdir, | |
2516 | .unlink = NULL, | |
2517 | .rmdir = lxcfs_rmdir, | |
2518 | .symlink = NULL, | |
2519 | .rename = NULL, | |
2520 | .link = NULL, | |
2521 | .chmod = lxcfs_chmod, | |
2522 | .chown = lxcfs_chown, | |
2523 | .truncate = lxcfs_truncate, | |
2524 | .utime = NULL, | |
2525 | ||
2526 | .open = lxcfs_open, | |
2527 | .read = lxcfs_read, | |
2528 | .release = lxcfs_release, | |
2529 | .write = lxcfs_write, | |
2530 | ||
2531 | .statfs = NULL, | |
2532 | .flush = lxcfs_flush, | |
2533 | .fsync = lxcfs_fsync, | |
2534 | ||
2535 | .setxattr = NULL, | |
2536 | .getxattr = NULL, | |
2537 | .listxattr = NULL, | |
2538 | .removexattr = NULL, | |
2539 | ||
2540 | .opendir = lxcfs_opendir, | |
2541 | .readdir = lxcfs_readdir, | |
2542 | .releasedir = lxcfs_releasedir, | |
2543 | ||
2544 | .fsyncdir = NULL, | |
2545 | .init = NULL, | |
2546 | .destroy = NULL, | |
2547 | .access = NULL, | |
2548 | .create = NULL, | |
2549 | .ftruncate = NULL, | |
2550 | .fgetattr = NULL, | |
2551 | }; | |
2552 | ||
2553 | static void usage(const char *me) | |
2554 | { | |
2555 | fprintf(stderr, "Usage:\n"); | |
2556 | fprintf(stderr, "\n"); | |
2557 | fprintf(stderr, "%s mountpoint\n", me); | |
2558 | fprintf(stderr, "%s -h\n", me); | |
2559 | exit(1); | |
2560 | } | |
2561 | ||
2562 | static bool is_help(char *w) | |
2563 | { | |
2564 | if (strcmp(w, "-h") == 0 || | |
2565 | strcmp(w, "--help") == 0 || | |
2566 | strcmp(w, "-help") == 0 || | |
2567 | strcmp(w, "help") == 0) | |
2568 | return true; | |
2569 | return false; | |
2570 | } | |
2571 | ||
2572 | void swallow_arg(int *argcp, char *argv[], char *which) | |
2573 | { | |
2574 | int i; | |
2575 | ||
2576 | for (i = 1; argv[i]; i++) { | |
2577 | if (strcmp(argv[i], which) != 0) | |
2578 | continue; | |
2579 | for (; argv[i]; i++) { | |
2580 | argv[i] = argv[i+1]; | |
2581 | } | |
2582 | (*argcp)--; | |
2583 | return; | |
2584 | } | |
2585 | } | |
2586 | ||
2587 | void swallow_option(int *argcp, char *argv[], char *opt, char *v) | |
2588 | { | |
2589 | int i; | |
2590 | ||
2591 | for (i = 1; argv[i]; i++) { | |
2592 | if (!argv[i+1]) | |
2593 | continue; | |
2594 | if (strcmp(argv[i], opt) != 0) | |
2595 | continue; | |
2596 | if (strcmp(argv[i+1], v) != 0) { | |
2597 | fprintf(stderr, "Warning: unexpected fuse option %s\n", v); | |
2598 | exit(1); | |
2599 | } | |
2600 | for (; argv[i+1]; i++) { | |
2601 | argv[i] = argv[i+2]; | |
2602 | } | |
2603 | (*argcp) -= 2; | |
2604 | return; | |
2605 | } | |
2606 | } | |
2607 | ||
2608 | int main(int argc, char *argv[]) | |
2609 | { | |
2610 | int ret; | |
2611 | struct lxcfs_state *d; | |
2612 | /* | |
2613 | * what we pass to fuse_main is: | |
2614 | * argv[0] -s -f -o allow_other,directio argv[1] NULL | |
2615 | */ | |
2616 | #define NARGS 7 | |
2617 | char *newargv[7]; | |
2618 | ||
2619 | /* accomodate older init scripts */ | |
2620 | swallow_arg(&argc, argv, "-s"); | |
2621 | swallow_arg(&argc, argv, "-f"); | |
2622 | swallow_option(&argc, argv, "-o", "allow_other"); | |
2623 | ||
2624 | if (argc != 2 || is_help(argv[1])) | |
2625 | usage(argv[0]); | |
2626 | ||
2627 | d = NIH_MUST( malloc(sizeof(*d)) ); | |
2628 | ||
2629 | newargv[0] = argv[0]; | |
2630 | newargv[1] = "-s"; | |
2631 | newargv[2] = "-f"; | |
2632 | newargv[3] = "-o"; | |
2633 | newargv[4] = "allow_other,direct_io"; | |
2634 | newargv[5] = argv[1]; | |
2635 | newargv[6] = NULL; | |
2636 | ||
2637 | if (!cgm_escape_cgroup()) | |
2638 | fprintf(stderr, "WARNING: failed to escape to root cgroup\n"); | |
2639 | ||
2640 | if (!cgm_get_controllers(&d->subsystems)) | |
2641 | return -1; | |
2642 | ||
2643 | ret = fuse_main(NARGS - 1, newargv, &lxcfs_ops, d); | |
2644 | ||
2645 | return ret; | |
2646 | } |