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Commit | Line | Data |
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758ad80c SH |
1 | /* lxcfs |
2 | * | |
3 | * Copyright © 2014 Canonical, Inc | |
4 | * Author: Serge Hallyn <serge.hallyn@ubuntu.com> | |
5 | * | |
f2799430 | 6 | * See COPYING file for details. |
758ad80c SH |
7 | */ |
8 | ||
9 | /* | |
10 | * NOTES - make sure to run this as -s to avoid threading. | |
11 | * TODO - can we enforce that here from the code? | |
12 | */ | |
13 | #define FUSE_USE_VERSION 26 | |
14 | ||
2183082c | 15 | #include <stdio.h> |
758ad80c SH |
16 | #include <dirent.h> |
17 | #include <fcntl.h> | |
18 | #include <fuse.h> | |
19 | #include <unistd.h> | |
20 | #include <errno.h> | |
21 | #include <stdbool.h> | |
22 | #include <time.h> | |
23 | #include <string.h> | |
24 | #include <stdlib.h> | |
25 | #include <libgen.h> | |
41bb9357 SH |
26 | #include <sched.h> |
27 | #include <linux/sched.h> | |
a05660a6 | 28 | #include <sys/socket.h> |
41bb9357 SH |
29 | #include <sys/mount.h> |
30 | #include <wait.h> | |
758ad80c SH |
31 | |
32 | #include <nih/alloc.h> | |
33 | #include <nih/string.h> | |
34 | ||
35 | #include "cgmanager.h" | |
36 | ||
37 | struct lxcfs_state { | |
38 | /* | |
39 | * a null-terminated, nih-allocated list of the mounted subsystems. We | |
40 | * detect this at startup. | |
41 | */ | |
42 | char **subsystems; | |
43 | }; | |
44 | #define LXCFS_DATA ((struct lxcfs_state *) fuse_get_context()->private_data) | |
45 | ||
443d13f5 SH |
46 | enum { |
47 | LXC_TYPE_CGDIR, | |
48 | LXC_TYPE_CGFILE, | |
49 | LXC_TYPE_PROC_MEMINFO, | |
50 | LXC_TYPE_PROC_CPUINFO, | |
51 | LXC_TYPE_PROC_UPTIME, | |
52 | LXC_TYPE_PROC_STAT, | |
53 | LXC_TYPE_PROC_DISKSTATS, | |
54 | }; | |
55 | ||
c688e1b3 SH |
56 | struct file_info { |
57 | char *controller; | |
58 | char *cgroup; | |
8f6e8f5e | 59 | char *file; |
443d13f5 | 60 | int type; |
c688e1b3 SH |
61 | char *buf; // unused as of yet |
62 | int buflen; | |
63 | }; | |
64 | ||
bae07053 | 65 | static char *must_copy_string(void *parent, const char *str) |
c688e1b3 SH |
66 | { |
67 | if (!str) | |
68 | return NULL; | |
bae07053 | 69 | return NIH_MUST( nih_strdup(parent, str) ); |
c688e1b3 SH |
70 | } |
71 | ||
4775fba1 SH |
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 | */ | |
a05660a6 SH |
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 | ||
053a659d SH |
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 | */ | |
647c89e5 | 119 | fprintf(stderr, "pid wrapparound at entry %u %u %u in %s\n", |
053a659d SH |
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 | ||
341b21ad SH |
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) | |
758ad80c | 147 | { |
053a659d SH |
148 | nih_local char *fpath = NULL; |
149 | bool answer = false; | |
150 | uid_t nsuid; | |
151 | ||
341b21ad SH |
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) | |
758ad80c SH |
161 | return true; |
162 | ||
053a659d SH |
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 | ||
341b21ad | 168 | /* if caller's not root in his namespace, reject */ |
053a659d SH |
169 | nsuid = convert_id_to_ns(f, uid); |
170 | if (nsuid) | |
171 | goto out; | |
172 | ||
341b21ad SH |
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 | */ | |
053a659d SH |
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; | |
758ad80c SH |
187 | } |
188 | ||
189 | static bool perms_include(int fmode, mode_t req_mode) | |
190 | { | |
2ad6d2bd SH |
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); | |
758ad80c SH |
207 | } |
208 | ||
3db25a35 SH |
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 | ||
758ad80c SH |
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]; | |
341b21ad | 255 | if (is_privileged_over(fc->pid, fc->uid, k->uid, NS_ROOT_OPT)) { |
758ad80c SH |
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 | ||
3db25a35 SH |
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 | ||
758ad80c SH |
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 | p1 = path+8; | |
343 | ret = nih_strdup(NULL, p1); | |
344 | if (!ret) | |
345 | return ret; | |
346 | slash = strstr(ret, "/"); | |
347 | if (slash) | |
348 | *slash = '\0'; | |
349 | ||
350 | /* verify that it is a subsystem */ | |
351 | char **list = LXCFS_DATA ? LXCFS_DATA->subsystems : NULL; | |
352 | int i; | |
353 | if (!list) { | |
354 | nih_free(ret); | |
355 | return NULL; | |
356 | } | |
357 | for (i = 0; list[i]; i++) { | |
358 | if (strcmp(list[i], ret) == 0) | |
359 | return ret; | |
360 | } | |
361 | nih_free(ret); | |
362 | return NULL; | |
363 | } | |
364 | ||
365 | /* | |
366 | * Find the start of cgroup in /cgroup/controller/the/cgroup/path | |
367 | * Note that the returned value may include files (keynames) etc | |
368 | */ | |
369 | static const char *find_cgroup_in_path(const char *path) | |
370 | { | |
371 | const char *p1; | |
372 | ||
373 | if (strlen(path) < 9) | |
374 | return NULL; | |
375 | p1 = strstr(path+8, "/"); | |
376 | if (!p1) | |
377 | return NULL; | |
378 | return p1+1; | |
379 | } | |
380 | ||
381 | static bool is_child_cgroup(const char *contr, const char *dir, const char *f) | |
382 | { | |
383 | nih_local char **list = NULL; | |
384 | int i; | |
385 | ||
386 | if (!f) | |
387 | return false; | |
388 | if (*f == '/') | |
389 | f++; | |
390 | ||
391 | if (!cgm_list_children(contr, dir, &list)) | |
392 | return false; | |
393 | for (i = 0; list[i]; i++) { | |
394 | if (strcmp(list[i], f) == 0) | |
395 | return true; | |
396 | } | |
397 | ||
398 | return false; | |
399 | } | |
400 | ||
401 | static struct cgm_keys *get_cgroup_key(const char *contr, const char *dir, const char *f) | |
402 | { | |
403 | nih_local struct cgm_keys **list = NULL; | |
404 | struct cgm_keys *k; | |
405 | int i; | |
406 | ||
407 | if (!f) | |
408 | return NULL; | |
409 | if (*f == '/') | |
410 | f++; | |
411 | if (!cgm_list_keys(contr, dir, &list)) | |
412 | return NULL; | |
413 | for (i = 0; list[i]; i++) { | |
414 | if (strcmp(list[i]->name, f) == 0) { | |
415 | k = NIH_MUST( nih_alloc(NULL, (sizeof(*k))) ); | |
416 | k->name = NIH_MUST( nih_strdup(k, list[i]->name) ); | |
417 | k->uid = list[i]->uid; | |
418 | k->gid = list[i]->gid; | |
419 | k->mode = list[i]->mode; | |
420 | return k; | |
421 | } | |
422 | } | |
423 | ||
424 | return NULL; | |
425 | } | |
426 | ||
427 | static void get_cgdir_and_path(const char *cg, char **dir, char **file) | |
428 | { | |
758ad80c SH |
429 | char *p; |
430 | ||
431 | *dir = NIH_MUST( nih_strdup(NULL, cg) ); | |
432 | *file = strrchr(cg, '/'); | |
433 | if (!*file) { | |
434 | *file = NULL; | |
435 | return; | |
436 | } | |
437 | p = strrchr(*dir, '/'); | |
438 | *p = '\0'; | |
439 | } | |
440 | ||
99978832 SH |
441 | static size_t get_file_size(const char *contrl, const char *cg, const char *f) |
442 | { | |
443 | nih_local char *data = NULL; | |
444 | size_t s; | |
445 | if (!cgm_get_value(contrl, cg, f, &data)) | |
446 | return -EINVAL; | |
447 | s = strlen(data); | |
448 | return s; | |
449 | } | |
2ad6d2bd | 450 | |
758ad80c | 451 | /* |
2ad6d2bd | 452 | * FUSE ops for /cgroup |
758ad80c | 453 | */ |
2ad6d2bd | 454 | |
758ad80c SH |
455 | static int cg_getattr(const char *path, struct stat *sb) |
456 | { | |
457 | struct timespec now; | |
458 | struct fuse_context *fc = fuse_get_context(); | |
459 | nih_local char * cgdir = NULL; | |
460 | char *fpath = NULL, *path1, *path2; | |
461 | nih_local struct cgm_keys *k = NULL; | |
462 | const char *cgroup; | |
463 | nih_local char *controller = NULL; | |
464 | ||
465 | ||
466 | if (!fc) | |
467 | return -EIO; | |
468 | ||
469 | memset(sb, 0, sizeof(struct stat)); | |
470 | ||
471 | if (clock_gettime(CLOCK_REALTIME, &now) < 0) | |
472 | return -EINVAL; | |
473 | ||
474 | sb->st_uid = sb->st_gid = 0; | |
475 | sb->st_atim = sb->st_mtim = sb->st_ctim = now; | |
476 | sb->st_size = 0; | |
477 | ||
478 | if (strcmp(path, "/cgroup") == 0) { | |
479 | sb->st_mode = S_IFDIR | 00755; | |
480 | sb->st_nlink = 2; | |
481 | return 0; | |
482 | } | |
483 | ||
484 | controller = pick_controller_from_path(fc, path); | |
485 | if (!controller) | |
486 | return -EIO; | |
758ad80c SH |
487 | cgroup = find_cgroup_in_path(path); |
488 | if (!cgroup) { | |
489 | /* this is just /cgroup/controller, return it as a dir */ | |
490 | sb->st_mode = S_IFDIR | 00755; | |
491 | sb->st_nlink = 2; | |
492 | return 0; | |
493 | } | |
341b21ad | 494 | |
758ad80c SH |
495 | get_cgdir_and_path(cgroup, &cgdir, &fpath); |
496 | ||
497 | if (!fpath) { | |
498 | path1 = "/"; | |
499 | path2 = cgdir; | |
500 | } else { | |
501 | path1 = cgdir; | |
502 | path2 = fpath; | |
503 | } | |
504 | ||
758ad80c SH |
505 | /* check that cgcopy is either a child cgroup of cgdir, or listed in its keys. |
506 | * Then check that caller's cgroup is under path if fpath is a child | |
507 | * cgroup, or cgdir if fpath is a file */ | |
508 | ||
509 | if (is_child_cgroup(controller, path1, path2)) { | |
f9a05025 SH |
510 | if (!caller_is_in_ancestor(fc->pid, controller, cgroup, NULL)) { |
511 | /* this is just /cgroup/controller, return it as a dir */ | |
512 | sb->st_mode = S_IFDIR | 00555; | |
513 | sb->st_nlink = 2; | |
514 | return 0; | |
515 | } | |
758ad80c | 516 | if (!fc_may_access(fc, controller, cgroup, NULL, O_RDONLY)) |
f9a05025 | 517 | return -EACCES; |
758ad80c | 518 | |
053a659d SH |
519 | // get uid, gid, from '/tasks' file and make up a mode |
520 | // That is a hack, until cgmanager gains a GetCgroupPerms fn. | |
521 | sb->st_mode = S_IFDIR | 00755; | |
522 | k = get_cgroup_key(controller, cgroup, "tasks"); | |
523 | if (!k) { | |
053a659d SH |
524 | sb->st_uid = sb->st_gid = 0; |
525 | } else { | |
053a659d SH |
526 | sb->st_uid = k->uid; |
527 | sb->st_gid = k->gid; | |
528 | } | |
758ad80c SH |
529 | sb->st_nlink = 2; |
530 | return 0; | |
531 | } | |
532 | ||
533 | if ((k = get_cgroup_key(controller, path1, path2)) != NULL) { | |
3db25a35 SH |
534 | if (!caller_is_in_ancestor(fc->pid, controller, path1, NULL)) |
535 | return -ENOENT; | |
758ad80c | 536 | if (!fc_may_access(fc, controller, path1, path2, O_RDONLY)) |
f9a05025 | 537 | return -EACCES; |
758ad80c | 538 | |
758ad80c | 539 | sb->st_mode = S_IFREG | k->mode; |
053a659d | 540 | sb->st_nlink = 1; |
758ad80c SH |
541 | sb->st_uid = k->uid; |
542 | sb->st_gid = k->gid; | |
99978832 | 543 | sb->st_size = get_file_size(controller, path1, path2); |
758ad80c SH |
544 | return 0; |
545 | } | |
546 | ||
ab54b798 | 547 | return -ENOENT; |
758ad80c | 548 | } |
2183082c | 549 | |
7f163b71 SH |
550 | /* |
551 | * TODO - cache these results in a table for use in opendir, free | |
552 | * in releasedir | |
553 | */ | |
758ad80c | 554 | static int cg_opendir(const char *path, struct fuse_file_info *fi) |
2183082c | 555 | { |
7f163b71 SH |
556 | struct fuse_context *fc = fuse_get_context(); |
557 | nih_local struct cgm_keys **list = NULL; | |
558 | const char *cgroup; | |
c688e1b3 | 559 | struct file_info *dir_info; |
7f163b71 | 560 | nih_local char *controller = NULL; |
7f163b71 SH |
561 | |
562 | if (!fc) | |
563 | return -EIO; | |
564 | ||
c688e1b3 SH |
565 | if (strcmp(path, "/cgroup") == 0) { |
566 | cgroup = NULL; | |
567 | controller = NULL; | |
568 | } else { | |
569 | // return list of keys for the controller, and list of child cgroups | |
570 | controller = pick_controller_from_path(fc, path); | |
571 | if (!controller) | |
572 | return -EIO; | |
7f163b71 | 573 | |
c688e1b3 SH |
574 | cgroup = find_cgroup_in_path(path); |
575 | if (!cgroup) { | |
576 | /* this is just /cgroup/controller, return its contents */ | |
577 | cgroup = "/"; | |
578 | } | |
7f163b71 SH |
579 | } |
580 | ||
3a6e1a76 | 581 | if (cgroup && !fc_may_access(fc, controller, cgroup, NULL, O_RDONLY)) |
7f163b71 | 582 | return -EACCES; |
c688e1b3 SH |
583 | |
584 | /* we'll free this at cg_releasedir */ | |
585 | dir_info = NIH_MUST( nih_alloc(NULL, sizeof(*dir_info)) ); | |
bae07053 SH |
586 | dir_info->controller = must_copy_string(dir_info, controller); |
587 | dir_info->cgroup = must_copy_string(dir_info, cgroup); | |
443d13f5 | 588 | dir_info->type = LXC_TYPE_CGDIR; |
c688e1b3 | 589 | dir_info->buf = NULL; |
8f6e8f5e | 590 | dir_info->file = NULL; |
c688e1b3 SH |
591 | dir_info->buflen = 0; |
592 | ||
593 | fi->fh = (unsigned long)dir_info; | |
758ad80c SH |
594 | return 0; |
595 | } | |
596 | ||
758ad80c SH |
597 | static int cg_readdir(const char *path, void *buf, fuse_fill_dir_t filler, off_t offset, |
598 | struct fuse_file_info *fi) | |
599 | { | |
c688e1b3 SH |
600 | struct file_info *d = (struct file_info *)fi->fh; |
601 | nih_local struct cgm_keys **list = NULL; | |
602 | int i; | |
603 | nih_local char *nextcg = NULL; | |
758ad80c SH |
604 | struct fuse_context *fc = fuse_get_context(); |
605 | ||
443d13f5 | 606 | if (d->type != LXC_TYPE_CGDIR) { |
b845ad01 SH |
607 | fprintf(stderr, "Internal error: file cache info used in readdir\n"); |
608 | return -EIO; | |
609 | } | |
c688e1b3 SH |
610 | if (!d->cgroup && !d->controller) { |
611 | // ls /var/lib/lxcfs/cgroup - just show list of controllers | |
758ad80c SH |
612 | char **list = LXCFS_DATA ? LXCFS_DATA->subsystems : NULL; |
613 | int i; | |
614 | ||
615 | if (!list) | |
616 | return -EIO; | |
7f163b71 | 617 | |
758ad80c SH |
618 | for (i = 0; list[i]; i++) { |
619 | if (filler(buf, list[i], NULL, 0) != 0) { | |
620 | return -EIO; | |
621 | } | |
622 | } | |
623 | return 0; | |
624 | } | |
625 | ||
c688e1b3 | 626 | if (!cgm_list_keys(d->controller, d->cgroup, &list)) |
3db25a35 | 627 | // not a valid cgroup |
758ad80c | 628 | return -EINVAL; |
3db25a35 | 629 | |
c688e1b3 | 630 | if (!caller_is_in_ancestor(fc->pid, d->controller, d->cgroup, &nextcg)) { |
3db25a35 SH |
631 | if (nextcg) { |
632 | int ret; | |
633 | ret = filler(buf, nextcg, NULL, 0); | |
634 | if (ret != 0) | |
635 | return -EIO; | |
636 | } | |
637 | return 0; | |
638 | } | |
639 | ||
758ad80c | 640 | for (i = 0; list[i]; i++) { |
758ad80c SH |
641 | if (filler(buf, list[i]->name, NULL, 0) != 0) { |
642 | return -EIO; | |
643 | } | |
644 | } | |
645 | ||
646 | // now get the list of child cgroups | |
422aa4a5 | 647 | nih_local char **clist = NULL; |
758ad80c | 648 | |
c688e1b3 | 649 | if (!cgm_list_children(d->controller, d->cgroup, &clist)) |
758ad80c SH |
650 | return 0; |
651 | for (i = 0; clist[i]; i++) { | |
758ad80c SH |
652 | if (filler(buf, clist[i], NULL, 0) != 0) { |
653 | return -EIO; | |
654 | } | |
655 | } | |
656 | return 0; | |
657 | } | |
658 | ||
8f6e8f5e SH |
659 | static void do_release_file_info(struct file_info *f) |
660 | { | |
bae07053 SH |
661 | /* |
662 | * all file_info fields which are nih_alloc()d with f as parent | |
663 | * will be automatically freed | |
664 | */ | |
8f6e8f5e SH |
665 | nih_free(f); |
666 | } | |
667 | ||
758ad80c SH |
668 | static int cg_releasedir(const char *path, struct fuse_file_info *fi) |
669 | { | |
c688e1b3 SH |
670 | struct file_info *d = (struct file_info *)fi->fh; |
671 | ||
8f6e8f5e | 672 | do_release_file_info(d); |
758ad80c SH |
673 | return 0; |
674 | } | |
675 | ||
99978832 SH |
676 | static int cg_open(const char *path, struct fuse_file_info *fi) |
677 | { | |
678 | nih_local char *controller = NULL; | |
679 | const char *cgroup; | |
680 | char *fpath = NULL, *path1, *path2; | |
681 | nih_local char * cgdir = NULL; | |
682 | nih_local struct cgm_keys *k = NULL; | |
8f6e8f5e | 683 | struct file_info *file_info; |
99978832 SH |
684 | struct fuse_context *fc = fuse_get_context(); |
685 | ||
686 | if (!fc) | |
687 | return -EIO; | |
688 | ||
689 | controller = pick_controller_from_path(fc, path); | |
690 | if (!controller) | |
691 | return -EIO; | |
692 | cgroup = find_cgroup_in_path(path); | |
693 | if (!cgroup) | |
694 | return -EINVAL; | |
695 | ||
696 | get_cgdir_and_path(cgroup, &cgdir, &fpath); | |
697 | if (!fpath) { | |
698 | path1 = "/"; | |
699 | path2 = cgdir; | |
700 | } else { | |
701 | path1 = cgdir; | |
702 | path2 = fpath; | |
703 | } | |
704 | ||
8f6e8f5e SH |
705 | k = get_cgroup_key(controller, path1, path2); |
706 | if (!k) | |
707 | return -EINVAL; | |
99978832 | 708 | |
8f6e8f5e SH |
709 | if (!fc_may_access(fc, controller, path1, path2, fi->flags)) |
710 | // should never get here | |
711 | return -EACCES; | |
99978832 | 712 | |
8f6e8f5e SH |
713 | /* we'll free this at cg_release */ |
714 | file_info = NIH_MUST( nih_alloc(NULL, sizeof(*file_info)) ); | |
bae07053 SH |
715 | file_info->controller = must_copy_string(file_info, controller); |
716 | file_info->cgroup = must_copy_string(file_info, path1); | |
717 | file_info->file = must_copy_string(file_info, path2); | |
443d13f5 | 718 | file_info->type = LXC_TYPE_CGFILE; |
8f6e8f5e SH |
719 | file_info->buf = NULL; |
720 | file_info->buflen = 0; | |
721 | ||
722 | fi->fh = (unsigned long)file_info; | |
723 | return 0; | |
724 | } | |
725 | ||
726 | static int cg_release(const char *path, struct fuse_file_info *fi) | |
727 | { | |
728 | struct file_info *f = (struct file_info *)fi->fh; | |
729 | ||
730 | do_release_file_info(f); | |
731 | return 0; | |
99978832 SH |
732 | } |
733 | ||
a05660a6 SH |
734 | static int msgrecv(int sockfd, void *buf, size_t len) |
735 | { | |
736 | struct timeval tv; | |
737 | fd_set rfds; | |
738 | ||
739 | FD_ZERO(&rfds); | |
740 | FD_SET(sockfd, &rfds); | |
741 | tv.tv_sec = 2; | |
742 | tv.tv_usec = 0; | |
743 | ||
ea56f722 | 744 | if (select(sockfd+1, &rfds, NULL, NULL, &tv) <= 0) |
a05660a6 SH |
745 | return -1; |
746 | return recv(sockfd, buf, len, MSG_DONTWAIT); | |
747 | } | |
748 | ||
01e71852 SH |
749 | #define SEND_CREDS_OK 0 |
750 | #define SEND_CREDS_NOTSK 1 | |
751 | #define SEND_CREDS_FAIL 2 | |
752 | static int send_creds(int sock, struct ucred *cred, char v, bool pingfirst) | |
a05660a6 SH |
753 | { |
754 | struct msghdr msg = { 0 }; | |
755 | struct iovec iov; | |
756 | struct cmsghdr *cmsg; | |
757 | char cmsgbuf[CMSG_SPACE(sizeof(*cred))]; | |
758 | char buf[1]; | |
759 | buf[0] = 'p'; | |
760 | ||
01e71852 SH |
761 | if (pingfirst) { |
762 | if (msgrecv(sock, buf, 1) != 1) { | |
1420baf8 | 763 | fprintf(stderr, "%s: Error getting reply from server over socketpair\n", |
01e71852 SH |
764 | __func__); |
765 | return SEND_CREDS_FAIL; | |
766 | } | |
a05660a6 SH |
767 | } |
768 | ||
769 | msg.msg_control = cmsgbuf; | |
770 | msg.msg_controllen = sizeof(cmsgbuf); | |
771 | ||
772 | cmsg = CMSG_FIRSTHDR(&msg); | |
773 | cmsg->cmsg_len = CMSG_LEN(sizeof(struct ucred)); | |
774 | cmsg->cmsg_level = SOL_SOCKET; | |
775 | cmsg->cmsg_type = SCM_CREDENTIALS; | |
776 | memcpy(CMSG_DATA(cmsg), cred, sizeof(*cred)); | |
777 | ||
778 | msg.msg_name = NULL; | |
779 | msg.msg_namelen = 0; | |
780 | ||
781 | buf[0] = v; | |
782 | iov.iov_base = buf; | |
783 | iov.iov_len = sizeof(buf); | |
784 | msg.msg_iov = &iov; | |
785 | msg.msg_iovlen = 1; | |
786 | ||
787 | if (sendmsg(sock, &msg, 0) < 0) { | |
1420baf8 | 788 | fprintf(stderr, "%s: failed at sendmsg: %s\n", __func__, |
a05660a6 SH |
789 | strerror(errno)); |
790 | if (errno == 3) | |
01e71852 SH |
791 | return SEND_CREDS_NOTSK; |
792 | return SEND_CREDS_FAIL; | |
a05660a6 SH |
793 | } |
794 | ||
01e71852 | 795 | return SEND_CREDS_OK; |
a05660a6 SH |
796 | } |
797 | ||
798 | static bool recv_creds(int sock, struct ucred *cred, char *v) | |
799 | { | |
800 | struct msghdr msg = { 0 }; | |
801 | struct iovec iov; | |
802 | struct cmsghdr *cmsg; | |
803 | char cmsgbuf[CMSG_SPACE(sizeof(*cred))]; | |
804 | char buf[1]; | |
805 | int ret; | |
806 | int optval = 1; | |
6ee867dc SH |
807 | struct timeval tv; |
808 | fd_set rfds; | |
a05660a6 SH |
809 | |
810 | *v = '1'; | |
811 | ||
812 | cred->pid = -1; | |
813 | cred->uid = -1; | |
814 | cred->gid = -1; | |
815 | ||
816 | if (setsockopt(sock, SOL_SOCKET, SO_PASSCRED, &optval, sizeof(optval)) == -1) { | |
1420baf8 | 817 | fprintf(stderr, "Failed to set passcred: %s\n", strerror(errno)); |
a05660a6 SH |
818 | return false; |
819 | } | |
820 | buf[0] = '1'; | |
821 | if (write(sock, buf, 1) != 1) { | |
1420baf8 | 822 | fprintf(stderr, "Failed to start write on scm fd: %s\n", strerror(errno)); |
a05660a6 SH |
823 | return false; |
824 | } | |
825 | ||
826 | msg.msg_name = NULL; | |
827 | msg.msg_namelen = 0; | |
828 | msg.msg_control = cmsgbuf; | |
829 | msg.msg_controllen = sizeof(cmsgbuf); | |
830 | ||
831 | iov.iov_base = buf; | |
832 | iov.iov_len = sizeof(buf); | |
833 | msg.msg_iov = &iov; | |
834 | msg.msg_iovlen = 1; | |
835 | ||
6ee867dc SH |
836 | FD_ZERO(&rfds); |
837 | FD_SET(sock, &rfds); | |
838 | tv.tv_sec = 2; | |
839 | tv.tv_usec = 0; | |
ea56f722 | 840 | if (select(sock+1, &rfds, NULL, NULL, &tv) <= 0) { |
6ee867dc SH |
841 | fprintf(stderr, "Failed to select for scm_cred: %s\n", |
842 | strerror(errno)); | |
843 | return false; | |
844 | } | |
845 | ret = recvmsg(sock, &msg, MSG_DONTWAIT); | |
a05660a6 | 846 | if (ret < 0) { |
1420baf8 | 847 | fprintf(stderr, "Failed to receive scm_cred: %s\n", |
a05660a6 SH |
848 | strerror(errno)); |
849 | return false; | |
850 | } | |
851 | ||
852 | cmsg = CMSG_FIRSTHDR(&msg); | |
853 | ||
854 | if (cmsg && cmsg->cmsg_len == CMSG_LEN(sizeof(struct ucred)) && | |
855 | cmsg->cmsg_level == SOL_SOCKET && | |
856 | cmsg->cmsg_type == SCM_CREDENTIALS) { | |
857 | memcpy(cred, CMSG_DATA(cmsg), sizeof(*cred)); | |
858 | } | |
859 | *v = buf[0]; | |
860 | ||
861 | return true; | |
862 | } | |
863 | ||
864 | ||
865 | /* | |
4775fba1 SH |
866 | * pid_to_ns - reads pids from a ucred over a socket, then writes the |
867 | * int value back over the socket. This shifts the pid from the | |
868 | * sender's pidns into tpid's pidns. | |
a05660a6 | 869 | */ |
4775fba1 | 870 | static void pid_to_ns(int sock, pid_t tpid) |
a05660a6 SH |
871 | { |
872 | char v = '0'; | |
873 | struct ucred cred; | |
874 | ||
875 | while (recv_creds(sock, &cred, &v)) { | |
876 | if (v == '1') | |
877 | exit(0); | |
a05660a6 SH |
878 | if (write(sock, &cred.pid, sizeof(pid_t)) != sizeof(pid_t)) |
879 | exit(1); | |
880 | } | |
881 | exit(0); | |
882 | } | |
883 | ||
884 | /* | |
4775fba1 | 885 | * pid_to_ns_wrapper: when you setns into a pidns, you yourself remain |
a05660a6 | 886 | * in your old pidns. Only children which you fork will be in the target |
4775fba1 | 887 | * pidns. So the pid_to_ns_wrapper does the setns, then forks a child to |
a05660a6 SH |
888 | * actually convert pids |
889 | */ | |
4775fba1 | 890 | static void pid_to_ns_wrapper(int sock, pid_t tpid) |
a05660a6 | 891 | { |
ea56f722 | 892 | int newnsfd = -1, ret, cpipe[2]; |
a05660a6 SH |
893 | char fnam[100]; |
894 | pid_t cpid; | |
ea56f722 SH |
895 | struct timeval tv; |
896 | fd_set s; | |
897 | char v; | |
a05660a6 SH |
898 | |
899 | sprintf(fnam, "/proc/%d/ns/pid", tpid); | |
900 | newnsfd = open(fnam, O_RDONLY); | |
901 | if (newnsfd < 0) | |
902 | exit(1); | |
903 | if (setns(newnsfd, 0) < 0) | |
904 | exit(1); | |
905 | close(newnsfd); | |
906 | ||
ea56f722 SH |
907 | if (pipe(cpipe) < 0) |
908 | exit(1); | |
a05660a6 | 909 | |
ea56f722 SH |
910 | loop: |
911 | cpid = fork(); | |
a05660a6 SH |
912 | if (cpid < 0) |
913 | exit(1); | |
ea56f722 SH |
914 | |
915 | if (!cpid) { | |
916 | char b = '1'; | |
917 | close(cpipe[0]); | |
918 | if (write(cpipe[1], &b, sizeof(char)) < 0) { | |
919 | fprintf(stderr, "%s (child): erorr on write: %s\n", | |
920 | __func__, strerror(errno)); | |
921 | } | |
922 | close(cpipe[1]); | |
4775fba1 | 923 | pid_to_ns(sock, tpid); |
ea56f722 SH |
924 | } |
925 | // give the child 1 second to be done forking and | |
926 | // write it's ack | |
927 | FD_ZERO(&s); | |
928 | FD_SET(cpipe[0], &s); | |
929 | tv.tv_sec = 1; | |
930 | tv.tv_usec = 0; | |
931 | ret = select(cpipe[0]+1, &s, NULL, NULL, &tv); | |
932 | if (ret <= 0) | |
933 | goto again; | |
934 | ret = read(cpipe[0], &v, 1); | |
935 | if (ret != sizeof(char) || v != '1') { | |
936 | goto again; | |
937 | } | |
938 | ||
a05660a6 SH |
939 | if (!wait_for_pid(cpid)) |
940 | exit(1); | |
941 | exit(0); | |
ea56f722 SH |
942 | |
943 | again: | |
944 | kill(cpid, SIGKILL); | |
945 | wait_for_pid(cpid); | |
946 | goto loop; | |
a05660a6 SH |
947 | } |
948 | ||
949 | /* | |
950 | * To read cgroup files with a particular pid, we will setns into the child | |
951 | * pidns, open a pipe, fork a child - which will be the first to really be in | |
952 | * the child ns - which does the cgm_get_value and writes the data to the pipe. | |
953 | */ | |
954 | static bool do_read_pids(pid_t tpid, const char *contrl, const char *cg, const char *file, char **d) | |
955 | { | |
956 | int sock[2] = {-1, -1}; | |
957 | nih_local char *tmpdata = NULL; | |
958 | int ret; | |
959 | pid_t qpid, cpid = -1; | |
960 | bool answer = false; | |
961 | char v = '0'; | |
962 | struct ucred cred; | |
963 | struct timeval tv; | |
964 | fd_set s; | |
965 | ||
966 | if (!cgm_get_value(contrl, cg, file, &tmpdata)) | |
967 | return false; | |
968 | ||
969 | /* | |
970 | * Now we read the pids from returned data one by one, pass | |
971 | * them into a child in the target namespace, read back the | |
972 | * translated pids, and put them into our to-return data | |
973 | */ | |
974 | ||
975 | if (socketpair(AF_UNIX, SOCK_DGRAM, 0, sock) < 0) { | |
976 | perror("socketpair"); | |
977 | exit(1); | |
978 | } | |
979 | ||
980 | cpid = fork(); | |
981 | if (cpid == -1) | |
982 | goto out; | |
983 | ||
984 | if (!cpid) // child | |
4775fba1 | 985 | pid_to_ns_wrapper(sock[1], tpid); |
a05660a6 SH |
986 | |
987 | char *ptr = tmpdata; | |
988 | cred.uid = 0; | |
989 | cred.gid = 0; | |
990 | while (sscanf(ptr, "%d\n", &qpid) == 1) { | |
991 | cred.pid = qpid; | |
01e71852 SH |
992 | ret = send_creds(sock[0], &cred, v, true); |
993 | ||
994 | if (ret == SEND_CREDS_NOTSK) | |
995 | goto next; | |
996 | if (ret == SEND_CREDS_FAIL) | |
a05660a6 SH |
997 | goto out; |
998 | ||
999 | // read converted results | |
1000 | FD_ZERO(&s); | |
1001 | FD_SET(sock[0], &s); | |
6ee867dc | 1002 | tv.tv_sec = 2; |
a05660a6 SH |
1003 | tv.tv_usec = 0; |
1004 | ret = select(sock[0]+1, &s, NULL, NULL, &tv); | |
1005 | if (ret <= 0) { | |
6ee867dc SH |
1006 | fprintf(stderr, "%s: select error waiting for pid from child: %s\n", |
1007 | __func__, strerror(errno)); | |
a05660a6 SH |
1008 | goto out; |
1009 | } | |
1010 | if (read(sock[0], &qpid, sizeof(qpid)) != sizeof(qpid)) { | |
6ee867dc SH |
1011 | fprintf(stderr, "%s: error reading pid from child: %s\n", |
1012 | __func__, strerror(errno)); | |
a05660a6 SH |
1013 | goto out; |
1014 | } | |
a05660a6 | 1015 | NIH_MUST( nih_strcat_sprintf(d, NULL, "%d\n", qpid) ); |
01e71852 | 1016 | next: |
a05660a6 SH |
1017 | ptr = strchr(ptr, '\n'); |
1018 | if (!ptr) | |
1019 | break; | |
1020 | ptr++; | |
1021 | } | |
1022 | ||
1023 | cred.pid = getpid(); | |
1024 | v = '1'; | |
01e71852 | 1025 | if (send_creds(sock[0], &cred, v, true) != SEND_CREDS_OK) { |
a05660a6 | 1026 | // failed to ask child to exit |
6ee867dc SH |
1027 | fprintf(stderr, "%s: failed to ask child to exit: %s\n", |
1028 | __func__, strerror(errno)); | |
a05660a6 SH |
1029 | goto out; |
1030 | } | |
1031 | ||
1032 | answer = true; | |
1033 | ||
1034 | out: | |
1035 | if (cpid != -1) | |
1036 | wait_for_pid(cpid); | |
1037 | if (sock[0] != -1) { | |
1038 | close(sock[0]); | |
1039 | close(sock[1]); | |
1040 | } | |
1041 | return answer; | |
1042 | } | |
1043 | ||
99978832 SH |
1044 | static int cg_read(const char *path, char *buf, size_t size, off_t offset, |
1045 | struct fuse_file_info *fi) | |
1046 | { | |
99978832 | 1047 | struct fuse_context *fc = fuse_get_context(); |
8f6e8f5e | 1048 | struct file_info *f = (struct file_info *)fi->fh; |
99978832 SH |
1049 | nih_local struct cgm_keys *k = NULL; |
1050 | ||
443d13f5 | 1051 | if (f->type != LXC_TYPE_CGFILE) { |
b845ad01 SH |
1052 | fprintf(stderr, "Internal error: directory cache info used in cg_read\n"); |
1053 | return -EIO; | |
1054 | } | |
1055 | ||
99978832 SH |
1056 | if (offset) |
1057 | return -EIO; | |
1058 | ||
1059 | if (!fc) | |
1060 | return -EIO; | |
1061 | ||
8f6e8f5e | 1062 | if (!f->controller) |
99978832 SH |
1063 | return -EINVAL; |
1064 | ||
8f6e8f5e | 1065 | if ((k = get_cgroup_key(f->controller, f->cgroup, f->file)) != NULL) { |
99978832 | 1066 | nih_local char *data = NULL; |
4775fba1 SH |
1067 | int s; |
1068 | bool r; | |
99978832 | 1069 | |
8f6e8f5e | 1070 | if (!fc_may_access(fc, f->controller, f->cgroup, f->file, O_RDONLY)) |
f9a05025 SH |
1071 | // should never get here |
1072 | return -EACCES; | |
99978832 | 1073 | |
8f6e8f5e SH |
1074 | if (strcmp(f->file, "tasks") == 0 || |
1075 | strcmp(f->file, "/tasks") == 0 || | |
1076 | strcmp(f->file, "/cgroup.procs") == 0 || | |
1077 | strcmp(f->file, "cgroup.procs") == 0) | |
a05660a6 | 1078 | // special case - we have to translate the pids |
8f6e8f5e | 1079 | r = do_read_pids(fc->pid, f->controller, f->cgroup, f->file, &data); |
a05660a6 | 1080 | else |
8f6e8f5e | 1081 | r = cgm_get_value(f->controller, f->cgroup, f->file, &data); |
a05660a6 | 1082 | |
4775fba1 | 1083 | if (!r) |
99978832 SH |
1084 | return -EINVAL; |
1085 | ||
4775fba1 SH |
1086 | if (!data) |
1087 | return 0; | |
99978832 SH |
1088 | s = strlen(data); |
1089 | if (s > size) | |
1090 | s = size; | |
1091 | memcpy(buf, data, s); | |
1092 | ||
99978832 SH |
1093 | return s; |
1094 | } | |
1095 | ||
1096 | return -EINVAL; | |
1097 | } | |
1098 | ||
4775fba1 SH |
1099 | static void pid_from_ns(int sock, pid_t tpid) |
1100 | { | |
1101 | pid_t vpid; | |
1102 | struct ucred cred; | |
1103 | char v; | |
6ee867dc SH |
1104 | struct timeval tv; |
1105 | fd_set s; | |
1106 | int ret; | |
4775fba1 SH |
1107 | |
1108 | cred.uid = 0; | |
1109 | cred.gid = 0; | |
6ee867dc SH |
1110 | while (1) { |
1111 | FD_ZERO(&s); | |
1112 | FD_SET(sock, &s); | |
1113 | tv.tv_sec = 2; | |
1114 | tv.tv_usec = 0; | |
1115 | ret = select(sock+1, &s, NULL, NULL, &tv); | |
ea56f722 SH |
1116 | if (ret <= 0) { |
1117 | fprintf(stderr, "%s: bad select before read from parent: %s\n", | |
6ee867dc SH |
1118 | __func__, strerror(errno)); |
1119 | exit(1); | |
1120 | } | |
1121 | if ((ret = read(sock, &vpid, sizeof(pid_t))) != sizeof(pid_t)) { | |
1122 | fprintf(stderr, "%s: bad read from parent: %s\n", | |
1123 | __func__, strerror(errno)); | |
1124 | exit(1); | |
1125 | } | |
4775fba1 | 1126 | if (vpid == -1) // done |
01e71852 | 1127 | break; |
4775fba1 SH |
1128 | v = '0'; |
1129 | cred.pid = vpid; | |
01e71852 | 1130 | if (send_creds(sock, &cred, v, true) != SEND_CREDS_OK) { |
4775fba1 SH |
1131 | v = '1'; |
1132 | cred.pid = getpid(); | |
01e71852 | 1133 | if (send_creds(sock, &cred, v, false) != SEND_CREDS_OK) |
4775fba1 SH |
1134 | exit(1); |
1135 | } | |
1136 | } | |
1137 | exit(0); | |
1138 | } | |
1139 | ||
1140 | static void pid_from_ns_wrapper(int sock, pid_t tpid) | |
1141 | { | |
ea56f722 | 1142 | int newnsfd = -1, ret, cpipe[2]; |
4775fba1 SH |
1143 | char fnam[100]; |
1144 | pid_t cpid; | |
ea56f722 SH |
1145 | fd_set s; |
1146 | struct timeval tv; | |
1147 | char v; | |
4775fba1 SH |
1148 | |
1149 | sprintf(fnam, "/proc/%d/ns/pid", tpid); | |
1150 | newnsfd = open(fnam, O_RDONLY); | |
1151 | if (newnsfd < 0) | |
1152 | exit(1); | |
1153 | if (setns(newnsfd, 0) < 0) | |
1154 | exit(1); | |
1155 | close(newnsfd); | |
1156 | ||
ea56f722 SH |
1157 | if (pipe(cpipe) < 0) |
1158 | exit(1); | |
1159 | ||
1160 | loop: | |
4775fba1 SH |
1161 | cpid = fork(); |
1162 | ||
1163 | if (cpid < 0) | |
1164 | exit(1); | |
ea56f722 SH |
1165 | |
1166 | if (!cpid) { | |
1167 | char b = '1'; | |
1168 | close(cpipe[0]); | |
1169 | if (write(cpipe[1], &b, sizeof(char)) < 0) { | |
1170 | fprintf(stderr, "%s (child): erorr on write: %s\n", | |
1171 | __func__, strerror(errno)); | |
1172 | } | |
1173 | close(cpipe[1]); | |
4775fba1 | 1174 | pid_from_ns(sock, tpid); |
ea56f722 SH |
1175 | } |
1176 | ||
1177 | // give the child 1 second to be done forking and | |
1178 | // write it's ack | |
1179 | FD_ZERO(&s); | |
1180 | FD_SET(cpipe[0], &s); | |
1181 | tv.tv_sec = 1; | |
1182 | tv.tv_usec = 0; | |
1183 | ret = select(cpipe[0]+1, &s, NULL, NULL, &tv); | |
1184 | if (ret <= 0) | |
1185 | goto again; | |
1186 | ret = read(cpipe[0], &v, 1); | |
1187 | if (ret != sizeof(char) || v != '1') { | |
1188 | goto again; | |
1189 | } | |
1190 | ||
4775fba1 SH |
1191 | if (!wait_for_pid(cpid)) |
1192 | exit(1); | |
1193 | exit(0); | |
ea56f722 SH |
1194 | |
1195 | again: | |
1196 | kill(cpid, SIGKILL); | |
1197 | wait_for_pid(cpid); | |
1198 | goto loop; | |
4775fba1 SH |
1199 | } |
1200 | ||
1201 | static bool do_write_pids(pid_t tpid, const char *contrl, const char *cg, const char *file, const char *buf) | |
1202 | { | |
1203 | int sock[2] = {-1, -1}; | |
1204 | pid_t qpid, cpid = -1; | |
1205 | bool answer = false, fail = false; | |
1206 | ||
1207 | /* | |
1208 | * write the pids to a socket, have helper in writer's pidns | |
1209 | * call movepid for us | |
1210 | */ | |
1211 | if (socketpair(AF_UNIX, SOCK_DGRAM, 0, sock) < 0) { | |
1212 | perror("socketpair"); | |
1213 | exit(1); | |
1214 | } | |
1215 | ||
1216 | cpid = fork(); | |
1217 | if (cpid == -1) | |
1218 | goto out; | |
1219 | ||
1220 | if (!cpid) // child | |
1221 | pid_from_ns_wrapper(sock[1], tpid); | |
1222 | ||
1223 | const char *ptr = buf; | |
1224 | while (sscanf(ptr, "%d", &qpid) == 1) { | |
1225 | struct ucred cred; | |
1226 | char v; | |
1227 | ||
1228 | if (write(sock[0], &qpid, sizeof(qpid)) != sizeof(qpid)) { | |
6ee867dc SH |
1229 | fprintf(stderr, "%s: error writing pid to child: %s\n", |
1230 | __func__, strerror(errno)); | |
4775fba1 SH |
1231 | goto out; |
1232 | } | |
1233 | ||
01e71852 SH |
1234 | if (recv_creds(sock[0], &cred, &v)) { |
1235 | if (v == '0') { | |
1236 | if (!cgm_move_pid(contrl, cg, cred.pid)) | |
1237 | fail = true; | |
1238 | } | |
4775fba1 SH |
1239 | } |
1240 | ||
1241 | ptr = strchr(ptr, '\n'); | |
1242 | if (!ptr) | |
1243 | break; | |
1244 | ptr++; | |
1245 | } | |
1246 | ||
1247 | /* All good, write the value */ | |
1248 | qpid = -1; | |
1249 | if (write(sock[0], &qpid ,sizeof(qpid)) != sizeof(qpid)) | |
1420baf8 | 1250 | fprintf(stderr, "Warning: failed to ask child to exit\n"); |
4775fba1 SH |
1251 | |
1252 | if (!fail) | |
1253 | answer = true; | |
1254 | ||
1255 | out: | |
1256 | if (cpid != -1) | |
1257 | wait_for_pid(cpid); | |
1258 | if (sock[0] != -1) { | |
1259 | close(sock[0]); | |
1260 | close(sock[1]); | |
1261 | } | |
1262 | return answer; | |
1263 | } | |
1264 | ||
2ad6d2bd SH |
1265 | int cg_write(const char *path, const char *buf, size_t size, off_t offset, |
1266 | struct fuse_file_info *fi) | |
1267 | { | |
2ad6d2bd | 1268 | struct fuse_context *fc = fuse_get_context(); |
47cbf0e5 | 1269 | nih_local char *localbuf = NULL; |
8f6e8f5e SH |
1270 | nih_local struct cgm_keys *k = NULL; |
1271 | struct file_info *f = (struct file_info *)fi->fh; | |
2ad6d2bd | 1272 | |
443d13f5 | 1273 | if (f->type != LXC_TYPE_CGFILE) { |
b845ad01 SH |
1274 | fprintf(stderr, "Internal error: directory cache info used in cg_write\n"); |
1275 | return -EIO; | |
1276 | } | |
1277 | ||
2ad6d2bd | 1278 | if (offset) |
f9a05025 | 1279 | return -EINVAL; |
2ad6d2bd SH |
1280 | |
1281 | if (!fc) | |
1282 | return -EIO; | |
1283 | ||
47cbf0e5 SH |
1284 | localbuf = NIH_MUST( nih_alloc(NULL, size+1) ); |
1285 | localbuf[size] = '\0'; | |
1286 | memcpy(localbuf, buf, size); | |
2ad6d2bd | 1287 | |
8f6e8f5e | 1288 | if ((k = get_cgroup_key(f->controller, f->cgroup, f->file)) != NULL) { |
4775fba1 SH |
1289 | bool r; |
1290 | ||
8f6e8f5e | 1291 | if (!fc_may_access(fc, f->controller, f->cgroup, f->file, O_WRONLY)) |
f9a05025 | 1292 | return -EACCES; |
2ad6d2bd | 1293 | |
8f6e8f5e SH |
1294 | if (strcmp(f->file, "tasks") == 0 || |
1295 | strcmp(f->file, "/tasks") == 0 || | |
1296 | strcmp(f->file, "/cgroup.procs") == 0 || | |
1297 | strcmp(f->file, "cgroup.procs") == 0) | |
4775fba1 | 1298 | // special case - we have to translate the pids |
8f6e8f5e | 1299 | r = do_write_pids(fc->pid, f->controller, f->cgroup, f->file, localbuf); |
4775fba1 | 1300 | else |
8f6e8f5e | 1301 | r = cgm_set_value(f->controller, f->cgroup, f->file, localbuf); |
4775fba1 SH |
1302 | |
1303 | if (!r) | |
2ad6d2bd SH |
1304 | return -EINVAL; |
1305 | ||
1306 | return size; | |
1307 | } | |
1308 | ||
1309 | return -EINVAL; | |
1310 | } | |
1311 | ||
341b21ad SH |
1312 | int cg_chown(const char *path, uid_t uid, gid_t gid) |
1313 | { | |
1314 | struct fuse_context *fc = fuse_get_context(); | |
1315 | nih_local char * cgdir = NULL; | |
1316 | char *fpath = NULL, *path1, *path2; | |
1317 | nih_local struct cgm_keys *k = NULL; | |
1318 | const char *cgroup; | |
1319 | nih_local char *controller = NULL; | |
1320 | ||
1321 | ||
1322 | if (!fc) | |
1323 | return -EIO; | |
1324 | ||
1325 | if (strcmp(path, "/cgroup") == 0) | |
1326 | return -EINVAL; | |
1327 | ||
1328 | controller = pick_controller_from_path(fc, path); | |
1329 | if (!controller) | |
f9a05025 | 1330 | return -EINVAL; |
341b21ad SH |
1331 | cgroup = find_cgroup_in_path(path); |
1332 | if (!cgroup) | |
1333 | /* this is just /cgroup/controller */ | |
1334 | return -EINVAL; | |
1335 | ||
1336 | get_cgdir_and_path(cgroup, &cgdir, &fpath); | |
1337 | ||
1338 | if (!fpath) { | |
1339 | path1 = "/"; | |
1340 | path2 = cgdir; | |
1341 | } else { | |
1342 | path1 = cgdir; | |
1343 | path2 = fpath; | |
1344 | } | |
1345 | ||
1346 | if (is_child_cgroup(controller, path1, path2)) { | |
1347 | // get uid, gid, from '/tasks' file and make up a mode | |
1348 | // That is a hack, until cgmanager gains a GetCgroupPerms fn. | |
1349 | k = get_cgroup_key(controller, cgroup, "tasks"); | |
1350 | ||
1351 | } else | |
1352 | k = get_cgroup_key(controller, path1, path2); | |
1353 | ||
1354 | if (!k) | |
1355 | return -EINVAL; | |
1356 | ||
1357 | /* | |
1358 | * This being a fuse request, the uid and gid must be valid | |
1359 | * in the caller's namespace. So we can just check to make | |
1360 | * sure that the caller is root in his uid, and privileged | |
1361 | * over the file's current owner. | |
1362 | */ | |
1363 | if (!is_privileged_over(fc->pid, fc->uid, k->uid, NS_ROOT_REQD)) | |
f9a05025 | 1364 | return -EACCES; |
341b21ad SH |
1365 | |
1366 | if (!cgm_chown_file(controller, cgroup, uid, gid)) | |
1367 | return -EINVAL; | |
1368 | return 0; | |
1369 | } | |
2ad6d2bd | 1370 | |
fd2e4e03 SH |
1371 | int cg_chmod(const char *path, mode_t mode) |
1372 | { | |
0a1bb5ea SH |
1373 | struct fuse_context *fc = fuse_get_context(); |
1374 | nih_local char * cgdir = NULL; | |
1375 | char *fpath = NULL, *path1, *path2; | |
1376 | nih_local struct cgm_keys *k = NULL; | |
1377 | const char *cgroup; | |
1378 | nih_local char *controller = NULL; | |
1379 | ||
1380 | if (!fc) | |
1381 | return -EIO; | |
1382 | ||
1383 | if (strcmp(path, "/cgroup") == 0) | |
1384 | return -EINVAL; | |
1385 | ||
1386 | controller = pick_controller_from_path(fc, path); | |
1387 | if (!controller) | |
f9a05025 | 1388 | return -EINVAL; |
0a1bb5ea SH |
1389 | cgroup = find_cgroup_in_path(path); |
1390 | if (!cgroup) | |
1391 | /* this is just /cgroup/controller */ | |
1392 | return -EINVAL; | |
1393 | ||
1394 | get_cgdir_and_path(cgroup, &cgdir, &fpath); | |
1395 | ||
1396 | if (!fpath) { | |
1397 | path1 = "/"; | |
1398 | path2 = cgdir; | |
1399 | } else { | |
1400 | path1 = cgdir; | |
1401 | path2 = fpath; | |
1402 | } | |
1403 | ||
1404 | if (is_child_cgroup(controller, path1, path2)) { | |
1405 | // get uid, gid, from '/tasks' file and make up a mode | |
1406 | // That is a hack, until cgmanager gains a GetCgroupPerms fn. | |
1407 | k = get_cgroup_key(controller, cgroup, "tasks"); | |
1408 | ||
1409 | } else | |
1410 | k = get_cgroup_key(controller, path1, path2); | |
1411 | ||
1412 | if (!k) | |
1413 | return -EINVAL; | |
1414 | ||
1415 | /* | |
1416 | * This being a fuse request, the uid and gid must be valid | |
1417 | * in the caller's namespace. So we can just check to make | |
1418 | * sure that the caller is root in his uid, and privileged | |
1419 | * over the file's current owner. | |
1420 | */ | |
1421 | if (!is_privileged_over(fc->pid, fc->uid, k->uid, NS_ROOT_OPT)) | |
1422 | return -EPERM; | |
1423 | ||
1424 | if (!cgm_chmod_file(controller, cgroup, mode)) | |
1425 | return -EINVAL; | |
1426 | return 0; | |
fd2e4e03 SH |
1427 | } |
1428 | ||
ab54b798 SH |
1429 | int cg_mkdir(const char *path, mode_t mode) |
1430 | { | |
1431 | struct fuse_context *fc = fuse_get_context(); | |
1432 | nih_local struct cgm_keys **list = NULL; | |
1433 | char *fpath = NULL, *path1; | |
1434 | nih_local char * cgdir = NULL; | |
1435 | const char *cgroup; | |
1436 | nih_local char *controller = NULL; | |
1437 | ||
ab54b798 SH |
1438 | if (!fc) |
1439 | return -EIO; | |
1440 | ||
1441 | ||
1442 | controller = pick_controller_from_path(fc, path); | |
1443 | if (!controller) | |
f9a05025 | 1444 | return -EINVAL; |
ab54b798 SH |
1445 | |
1446 | cgroup = find_cgroup_in_path(path); | |
1447 | if (!cgroup) | |
f9a05025 | 1448 | return -EINVAL; |
ab54b798 SH |
1449 | |
1450 | get_cgdir_and_path(cgroup, &cgdir, &fpath); | |
1451 | if (!fpath) | |
1452 | path1 = "/"; | |
1453 | else | |
1454 | path1 = cgdir; | |
1455 | ||
1456 | if (!fc_may_access(fc, controller, path1, NULL, O_RDWR)) | |
f9a05025 | 1457 | return -EACCES; |
ab54b798 SH |
1458 | |
1459 | ||
1460 | if (!cgm_create(controller, cgroup, fc->uid, fc->gid)) | |
1461 | return -EINVAL; | |
1462 | ||
1463 | return 0; | |
1464 | } | |
1465 | ||
50d8d5b5 SH |
1466 | static int cg_rmdir(const char *path) |
1467 | { | |
1468 | struct fuse_context *fc = fuse_get_context(); | |
1469 | nih_local struct cgm_keys **list = NULL; | |
1470 | char *fpath = NULL; | |
1471 | nih_local char * cgdir = NULL; | |
1472 | const char *cgroup; | |
1473 | nih_local char *controller = NULL; | |
1474 | ||
1475 | if (!fc) | |
1476 | return -EIO; | |
1477 | ||
1478 | ||
1479 | controller = pick_controller_from_path(fc, path); | |
1480 | if (!controller) | |
f9a05025 | 1481 | return -EINVAL; |
50d8d5b5 SH |
1482 | |
1483 | cgroup = find_cgroup_in_path(path); | |
1484 | if (!cgroup) | |
f9a05025 | 1485 | return -EINVAL; |
50d8d5b5 SH |
1486 | |
1487 | get_cgdir_and_path(cgroup, &cgdir, &fpath); | |
1488 | if (!fpath) | |
1489 | return -EINVAL; | |
1490 | ||
1491 | if (!fc_may_access(fc, controller, cgdir, NULL, O_WRONLY)) | |
f9a05025 | 1492 | return -EACCES; |
50d8d5b5 SH |
1493 | |
1494 | if (!cgm_remove(controller, cgroup)) | |
1495 | return -EINVAL; | |
1496 | ||
1497 | return 0; | |
1498 | } | |
1499 | ||
2dc17609 SH |
1500 | static bool startswith(const char *line, const char *pref) |
1501 | { | |
1502 | if (strncmp(line, pref, strlen(pref)) == 0) | |
1503 | return true; | |
1504 | return false; | |
1505 | } | |
1506 | ||
1507 | static void get_mem_cached(char *memstat, unsigned long *v) | |
1508 | { | |
1509 | char *eol; | |
1510 | ||
1511 | *v = 0; | |
1512 | while (*memstat) { | |
1513 | if (startswith(memstat, "total_cache")) { | |
1514 | sscanf(memstat + 11, "%lu", v); | |
1515 | *v /= 1024; | |
1516 | return; | |
1517 | } | |
1518 | eol = strchr(memstat, '\n'); | |
1519 | if (!eol) | |
1520 | return; | |
1521 | memstat = eol+1; | |
1522 | } | |
1523 | } | |
1524 | ||
49878439 YY |
1525 | static void get_blkio_io_value(char *str, unsigned major, unsigned minor, char *iotype, unsigned long *v) |
1526 | { | |
1527 | char *eol; | |
1528 | char key[32]; | |
1529 | ||
1530 | memset(key, 0, 32); | |
1531 | snprintf(key, 32, "%u:%u %s", major, minor, iotype); | |
1532 | ||
1533 | size_t len = strlen(key); | |
1534 | *v = 0; | |
1535 | ||
1536 | while (*str) { | |
1537 | if (startswith(str, key)) { | |
1538 | sscanf(str + len, "%lu", v); | |
1539 | return; | |
1540 | } | |
1541 | eol = strchr(str, '\n'); | |
1542 | if (!eol) | |
1543 | return; | |
1544 | str = eol+1; | |
1545 | } | |
1546 | } | |
1547 | ||
2dc17609 SH |
1548 | static char *get_pid_cgroup(pid_t pid, const char *contrl) |
1549 | { | |
1550 | nih_local char *fnam = NULL; | |
1551 | FILE *f; | |
1552 | char *answer = NULL; | |
1553 | char *line = NULL; | |
1554 | size_t len = 0; | |
1555 | ||
1556 | fnam = NIH_MUST( nih_sprintf(NULL, "/proc/%d/cgroup", pid) ); | |
1557 | if (!(f = fopen(fnam, "r"))) | |
1558 | return false; | |
1559 | ||
1560 | while (getline(&line, &len, f) != -1) { | |
1561 | char *c1, *c2; | |
1562 | if (!line[0]) | |
1563 | continue; | |
1564 | c1 = strchr(line, ':'); | |
1565 | if (!c1) | |
1566 | goto out; | |
1567 | c1++; | |
1568 | c2 = strchr(c1, ':'); | |
1569 | if (!c2) | |
1570 | goto out; | |
1571 | *c2 = '\0'; | |
1572 | if (strcmp(c1, contrl) != 0) | |
1573 | continue; | |
1574 | c2++; | |
1575 | stripnewline(c2); | |
1576 | answer = NIH_MUST( nih_strdup(NULL, c2) ); | |
1577 | goto out; | |
1578 | } | |
1579 | ||
1580 | out: | |
1581 | fclose(f); | |
1582 | free(line); | |
1583 | return answer; | |
1584 | } | |
1585 | ||
758ad80c | 1586 | /* |
2ad6d2bd | 1587 | * FUSE ops for /proc |
758ad80c | 1588 | */ |
758ad80c | 1589 | |
23ce2127 SH |
1590 | static int proc_meminfo_read(char *buf, size_t size, off_t offset, |
1591 | struct fuse_file_info *fi) | |
1592 | { | |
2dc17609 SH |
1593 | struct fuse_context *fc = fuse_get_context(); |
1594 | nih_local char *cg = get_pid_cgroup(fc->pid, "memory"); | |
1595 | nih_local char *memlimit_str = NULL, *memusage_str = NULL, *memstat_str = NULL; | |
1596 | unsigned long memlimit = 0, memusage = 0, cached = 0, hosttotal = 0; | |
1597 | char *line = NULL; | |
1598 | size_t linelen = 0, total_len = 0; | |
1599 | FILE *f; | |
1600 | ||
1601 | if (offset) | |
1602 | return -EINVAL; | |
1603 | ||
1604 | if (!cg) | |
1605 | return 0; | |
1606 | ||
1607 | if (!cgm_get_value("memory", cg, "memory.limit_in_bytes", &memlimit_str)) | |
1608 | return 0; | |
1609 | if (!cgm_get_value("memory", cg, "memory.usage_in_bytes", &memusage_str)) | |
1610 | return 0; | |
1611 | if (!cgm_get_value("memory", cg, "memory.stat", &memstat_str)) | |
1612 | return 0; | |
1613 | memlimit = strtoul(memlimit_str, NULL, 10); | |
1614 | memusage = strtoul(memusage_str, NULL, 10); | |
1615 | memlimit /= 1024; | |
1616 | memusage /= 1024; | |
1617 | get_mem_cached(memstat_str, &cached); | |
1618 | ||
1619 | f = fopen("/proc/meminfo", "r"); | |
1620 | if (!f) | |
1621 | return 0; | |
1622 | ||
1623 | while (getline(&line, &linelen, f) != -1) { | |
1624 | size_t l; | |
1625 | char *printme, lbuf[100]; | |
1626 | ||
1627 | memset(lbuf, 0, 100); | |
1628 | if (startswith(line, "MemTotal:")) { | |
1629 | sscanf(line+14, "%lu", &hosttotal); | |
1630 | if (hosttotal < memlimit) | |
1631 | memlimit = hosttotal; | |
1632 | snprintf(lbuf, 100, "MemTotal: %8lu kB\n", memlimit); | |
1633 | printme = lbuf; | |
1634 | } else if (startswith(line, "MemFree:")) { | |
1635 | snprintf(lbuf, 100, "MemFree: %8lu kB\n", memlimit - memusage); | |
1636 | printme = lbuf; | |
1637 | } else if (startswith(line, "MemAvailable:")) { | |
1638 | snprintf(lbuf, 100, "MemAvailable: %8lu kB\n", memlimit - memusage); | |
1639 | printme = lbuf; | |
1640 | } else if (startswith(line, "Buffers:")) { | |
1641 | snprintf(lbuf, 100, "Buffers: %8lu kB\n", 0UL); | |
1642 | printme = lbuf; | |
1643 | } else if (startswith(line, "Cached:")) { | |
1644 | snprintf(lbuf, 100, "Cached: %8lu kB\n", cached); | |
1645 | printme = lbuf; | |
1646 | } else if (startswith(line, "SwapCached:")) { | |
1647 | snprintf(lbuf, 100, "SwapCached: %8lu kB\n", 0UL); | |
1648 | printme = lbuf; | |
1649 | } else | |
1650 | printme = line; | |
1651 | l = snprintf(buf, size, "%s", printme); | |
1652 | buf += l; | |
1653 | size -= l; | |
1654 | total_len += l; | |
1655 | } | |
1656 | ||
92c84dc4 SH |
1657 | fclose(f); |
1658 | free(line); | |
2dc17609 | 1659 | return total_len; |
23ce2127 SH |
1660 | } |
1661 | ||
1662 | /* | |
1663 | * Read the cpuset.cpus for cg | |
1664 | * Return the answer in a nih_alloced string | |
1665 | */ | |
1666 | static char *get_cpuset(const char *cg) | |
1667 | { | |
1668 | char *answer; | |
1669 | ||
1670 | if (!cgm_get_value("cpuset", cg, "cpuset.cpus", &answer)) | |
1671 | return NULL; | |
1672 | return answer; | |
1673 | } | |
1674 | ||
1675 | /* | |
1676 | * Helper functions for cpuset_in-set | |
1677 | */ | |
1678 | char *cpuset_nexttok(const char *c) | |
1679 | { | |
1680 | char *r = strchr(c+1, ','); | |
1681 | if (r) | |
1682 | return r+1; | |
1683 | return NULL; | |
1684 | } | |
1685 | ||
1686 | int cpuset_getrange(const char *c, int *a, int *b) | |
1687 | { | |
1688 | int ret; | |
1689 | ||
1690 | ret = sscanf(c, "%d-%d", a, b); | |
1691 | return ret; | |
1692 | } | |
1693 | ||
1694 | /* | |
1695 | * cpusets are in format "1,2-3,4" | |
1696 | * iow, comma-delimited ranges | |
1697 | */ | |
aeb56147 | 1698 | static bool cpu_in_cpuset(int cpu, const char *cpuset) |
23ce2127 | 1699 | { |
23ce2127 SH |
1700 | const char *c; |
1701 | ||
23ce2127 SH |
1702 | for (c = cpuset; c; c = cpuset_nexttok(c)) { |
1703 | int a, b, ret; | |
1704 | ||
1705 | ret = cpuset_getrange(c, &a, &b); | |
1706 | if (ret == 1 && cpu == a) | |
1707 | return true; | |
1708 | if (ret != 2) // bad cpuset! | |
1709 | return false; | |
1710 | if (cpu >= a && cpu <= b) | |
1711 | return true; | |
1712 | } | |
1713 | ||
1714 | return false; | |
1715 | } | |
1716 | ||
aeb56147 SH |
1717 | static bool cpuline_in_cpuset(const char *line, const char *cpuset) |
1718 | { | |
1719 | int cpu; | |
1720 | ||
1721 | if (sscanf(line, "processor : %d", &cpu) != 1) | |
1722 | return false; | |
1723 | return cpu_in_cpuset(cpu, cpuset); | |
1724 | } | |
1725 | ||
23ce2127 SH |
1726 | /* |
1727 | * check whether this is a '^processor" line in /proc/cpuinfo | |
1728 | */ | |
1729 | static bool is_processor_line(const char *line) | |
1730 | { | |
1731 | int cpu; | |
1732 | ||
1733 | if (sscanf(line, "processor : %d", &cpu) == 1) | |
1734 | return true; | |
1735 | return false; | |
1736 | } | |
1737 | ||
23ce2127 SH |
1738 | static int proc_cpuinfo_read(char *buf, size_t size, off_t offset, |
1739 | struct fuse_file_info *fi) | |
1740 | { | |
1741 | struct fuse_context *fc = fuse_get_context(); | |
1742 | nih_local char *cg = get_pid_cgroup(fc->pid, "cpuset"); | |
1743 | nih_local char *cpuset = NULL; | |
1744 | char *line = NULL; | |
1745 | size_t linelen = 0, total_len = 0; | |
1746 | bool am_printing = false; | |
1747 | int curcpu = -1; | |
1748 | FILE *f; | |
1749 | ||
1750 | if (offset) | |
1751 | return -EINVAL; | |
1752 | ||
1753 | if (!cg) | |
1754 | return 0; | |
1755 | ||
1756 | cpuset = get_cpuset(cg); | |
1757 | if (!cpuset) | |
1758 | return 0; | |
1759 | ||
1760 | f = fopen("/proc/cpuinfo", "r"); | |
1761 | if (!f) | |
1762 | return 0; | |
1763 | ||
1764 | while (getline(&line, &linelen, f) != -1) { | |
1765 | size_t l; | |
1766 | if (is_processor_line(line)) { | |
aeb56147 | 1767 | am_printing = cpuline_in_cpuset(line, cpuset); |
23ce2127 SH |
1768 | if (am_printing) { |
1769 | curcpu ++; | |
1770 | l = snprintf(buf, size, "processor : %d\n", curcpu); | |
1771 | buf += l; | |
1772 | size -= l; | |
1773 | total_len += l; | |
1774 | } | |
1775 | continue; | |
1776 | } | |
1777 | if (am_printing) { | |
1778 | l = snprintf(buf, size, "%s", line); | |
1779 | buf += l; | |
1780 | size -= l; | |
1781 | total_len += l; | |
1782 | } | |
1783 | } | |
1784 | ||
92c84dc4 SH |
1785 | fclose(f); |
1786 | free(line); | |
23ce2127 SH |
1787 | return total_len; |
1788 | } | |
1789 | ||
1790 | static int proc_stat_read(char *buf, size_t size, off_t offset, | |
1791 | struct fuse_file_info *fi) | |
1792 | { | |
aeb56147 SH |
1793 | struct fuse_context *fc = fuse_get_context(); |
1794 | nih_local char *cg = get_pid_cgroup(fc->pid, "cpuset"); | |
1795 | nih_local char *cpuset = NULL; | |
1796 | char *line = NULL; | |
1797 | size_t linelen = 0, total_len = 0; | |
2a0fde62 | 1798 | int curcpu = -1; /* cpu numbering starts at 0 */ |
aeb56147 SH |
1799 | FILE *f; |
1800 | ||
1801 | if (offset) | |
1802 | return -EINVAL; | |
1803 | ||
1804 | if (!cg) | |
1805 | return 0; | |
1806 | ||
1807 | cpuset = get_cpuset(cg); | |
1808 | if (!cpuset) | |
1809 | return 0; | |
1810 | ||
1811 | f = fopen("/proc/stat", "r"); | |
1812 | if (!f) | |
1813 | return 0; | |
1814 | ||
1815 | while (getline(&line, &linelen, f) != -1) { | |
1816 | size_t l; | |
1817 | int cpu; | |
2a0fde62 | 1818 | char cpu_char[10]; /* That's a lot of cores */ |
aeb56147 SH |
1819 | char *c; |
1820 | ||
2a0fde62 CB |
1821 | if (sscanf(line, "cpu%9[^ ]", cpu_char) != 1) { |
1822 | /* not a ^cpuN line containing a number N, just print it */ | |
aeb56147 SH |
1823 | l = snprintf(buf, size, "%s", line); |
1824 | buf += l; | |
1825 | size -= l; | |
1826 | total_len += l; | |
1827 | continue; | |
1828 | } | |
2a0fde62 CB |
1829 | |
1830 | if (sscanf(cpu_char, "%d", &cpu) != 1) | |
1831 | continue; | |
aeb56147 SH |
1832 | if (!cpu_in_cpuset(cpu, cpuset)) |
1833 | continue; | |
1834 | curcpu ++; | |
1835 | ||
1836 | c = strchr(line, ' '); | |
1837 | if (!c) | |
1838 | continue; | |
1839 | l = snprintf(buf, size, "cpu%d %s", curcpu, c); | |
1840 | buf += l; | |
1841 | size -= l; | |
1842 | total_len += l; | |
1843 | } | |
1844 | ||
92c84dc4 SH |
1845 | fclose(f); |
1846 | free(line); | |
aeb56147 | 1847 | return total_len; |
23ce2127 SH |
1848 | } |
1849 | ||
7bbf2246 SH |
1850 | /* |
1851 | * How to guess what to present for uptime? | |
1852 | * One thing we could do would be to take the date on the caller's | |
1853 | * memory.usage_in_bytes file, which should equal the time of creation | |
1854 | * of his cgroup. However, a task could be in a sub-cgroup of the | |
1855 | * container. The same problem exists if we try to look at the ages | |
1856 | * of processes in the caller's cgroup. | |
1857 | * | |
1858 | * So we'll fork a task that will enter the caller's pidns, mount a | |
1859 | * fresh procfs, get the age of /proc/1, and pass that back over a pipe. | |
1860 | * | |
1861 | * For the second uptime #, we'll do as Stéphane had done, just copy | |
1862 | * the number from /proc/uptime. Not sure how to best emulate 'idle' | |
1863 | * time. Maybe someone can come up with a good algorithm and submit a | |
1864 | * patch. Maybe something based on cpushare info? | |
1865 | */ | |
41bb9357 SH |
1866 | |
1867 | /* return age of the reaper for $pid, taken from ctime of its procdir */ | |
1868 | static long int get_pid1_time(pid_t pid) | |
1869 | { | |
1870 | char fnam[100]; | |
ea56f722 | 1871 | int fd, cpipe[2], ret; |
41bb9357 | 1872 | struct stat sb; |
ea56f722 SH |
1873 | pid_t cpid; |
1874 | struct timeval tv; | |
1875 | fd_set s; | |
1876 | char v; | |
41bb9357 SH |
1877 | |
1878 | if (unshare(CLONE_NEWNS)) | |
1879 | return 0; | |
1880 | ||
5ca64c2a SG |
1881 | if (mount(NULL, "/", NULL, MS_SLAVE|MS_REC, NULL)) { |
1882 | perror("rslave mount failed"); | |
1883 | return 0; | |
1884 | } | |
1885 | ||
41bb9357 SH |
1886 | sprintf(fnam, "/proc/%d/ns/pid", pid); |
1887 | fd = open(fnam, O_RDONLY); | |
1888 | if (fd < 0) { | |
1889 | perror("get_pid1_time open of ns/pid"); | |
1890 | return 0; | |
1891 | } | |
1892 | if (setns(fd, 0)) { | |
1893 | perror("get_pid1_time setns 1"); | |
1894 | close(fd); | |
1895 | return 0; | |
1896 | } | |
1897 | close(fd); | |
41bb9357 | 1898 | |
ea56f722 SH |
1899 | if (pipe(cpipe) < 0) |
1900 | exit(1); | |
41bb9357 | 1901 | |
ea56f722 SH |
1902 | loop: |
1903 | cpid = fork(); | |
1904 | if (cpid < 0) | |
41bb9357 | 1905 | return 0; |
ea56f722 SH |
1906 | |
1907 | if (!cpid) { | |
1908 | char b = '1'; | |
1909 | close(cpipe[0]); | |
1910 | if (write(cpipe[1], &b, sizeof(char)) < 0) { | |
1911 | fprintf(stderr, "%s (child): erorr on write: %s\n", | |
1912 | __func__, strerror(errno)); | |
1913 | } | |
1914 | close(cpipe[1]); | |
1915 | umount2("/proc", MNT_DETACH); | |
1916 | if (mount("proc", "/proc", "proc", 0, NULL)) { | |
1917 | perror("get_pid1_time mount"); | |
1918 | return 0; | |
1919 | } | |
1920 | ret = lstat("/proc/1", &sb); | |
1921 | if (ret) { | |
1922 | perror("get_pid1_time lstat"); | |
1923 | return 0; | |
1924 | } | |
1925 | return time(NULL) - sb.st_ctime; | |
41bb9357 | 1926 | } |
ea56f722 SH |
1927 | |
1928 | // give the child 1 second to be done forking and | |
1929 | // write it's ack | |
1930 | FD_ZERO(&s); | |
1931 | FD_SET(cpipe[0], &s); | |
1932 | tv.tv_sec = 1; | |
1933 | tv.tv_usec = 0; | |
1934 | ret = select(cpipe[0]+1, &s, NULL, NULL, &tv); | |
1935 | if (ret <= 0) | |
1936 | goto again; | |
1937 | ret = read(cpipe[0], &v, 1); | |
1938 | if (ret != sizeof(char) || v != '1') { | |
1939 | goto again; | |
41bb9357 | 1940 | } |
ea56f722 SH |
1941 | |
1942 | wait_for_pid(cpid); | |
1943 | exit(0); | |
1944 | ||
1945 | again: | |
1946 | kill(cpid, SIGKILL); | |
1947 | wait_for_pid(cpid); | |
1948 | goto loop; | |
41bb9357 SH |
1949 | } |
1950 | ||
1951 | static long int getreaperage(pid_t qpid) | |
1952 | { | |
1953 | int pid, mypipe[2], ret; | |
1954 | struct timeval tv; | |
1955 | fd_set s; | |
1956 | long int mtime, answer = 0; | |
1957 | ||
1958 | if (pipe(mypipe)) { | |
1959 | return 0; | |
1960 | } | |
1961 | ||
1962 | pid = fork(); | |
1963 | ||
1964 | if (!pid) { // child | |
1965 | mtime = get_pid1_time(qpid); | |
1966 | if (write(mypipe[1], &mtime, sizeof(mtime)) != sizeof(mtime)) | |
1967 | fprintf(stderr, "Warning: bad write from getreaperage\n"); | |
1968 | exit(0); | |
1969 | } | |
1970 | ||
1971 | close(mypipe[1]); | |
1972 | FD_ZERO(&s); | |
1973 | FD_SET(mypipe[0], &s); | |
1974 | tv.tv_sec = 1; | |
1975 | tv.tv_usec = 0; | |
1976 | ret = select(mypipe[0]+1, &s, NULL, NULL, &tv); | |
ea56f722 | 1977 | if (ret <= 0) { |
41bb9357 SH |
1978 | perror("select"); |
1979 | goto out; | |
1980 | } | |
1981 | if (!ret) { | |
1420baf8 | 1982 | fprintf(stderr, "timed out\n"); |
41bb9357 SH |
1983 | goto out; |
1984 | } | |
1985 | if (read(mypipe[0], &mtime, sizeof(mtime)) != sizeof(mtime)) { | |
1986 | perror("read"); | |
1987 | goto out; | |
1988 | } | |
1989 | answer = mtime; | |
1990 | ||
1991 | out: | |
1992 | wait_for_pid(pid); | |
1993 | close(mypipe[0]); | |
1994 | return answer; | |
1995 | } | |
1996 | ||
1997 | static long int getprocidle(void) | |
1998 | { | |
1999 | FILE *f = fopen("/proc/uptime", "r"); | |
2000 | long int age, idle; | |
92c84dc4 | 2001 | int ret; |
41bb9357 SH |
2002 | if (!f) |
2003 | return 0; | |
92c84dc4 SH |
2004 | ret = fscanf(f, "%ld %ld", &age, &idle); |
2005 | fclose(f); | |
2006 | if (ret != 2) | |
41bb9357 SH |
2007 | return 0; |
2008 | return idle; | |
2009 | } | |
2010 | ||
2011 | /* | |
2012 | * We read /proc/uptime and reuse its second field. | |
2013 | * For the first field, we use the mtime for the reaper for | |
2014 | * the calling pid as returned by getreaperage | |
2015 | */ | |
23ce2127 SH |
2016 | static int proc_uptime_read(char *buf, size_t size, off_t offset, |
2017 | struct fuse_file_info *fi) | |
2018 | { | |
41bb9357 SH |
2019 | struct fuse_context *fc = fuse_get_context(); |
2020 | long int reaperage = getreaperage(fc->pid);; | |
2021 | long int idletime = getprocidle(); | |
2022 | ||
2023 | if (offset) | |
2024 | return -EINVAL; | |
2025 | return snprintf(buf, size, "%ld %ld\n", reaperage, idletime); | |
23ce2127 SH |
2026 | } |
2027 | ||
49878439 YY |
2028 | static int proc_diskstats_read(char *buf, size_t size, off_t offset, |
2029 | struct fuse_file_info *fi) | |
2030 | { | |
2031 | char dev_name[72]; | |
2032 | struct fuse_context *fc = fuse_get_context(); | |
2033 | nih_local char *cg = get_pid_cgroup(fc->pid, "blkio"); | |
2034 | nih_local char *io_serviced_str = NULL, *io_merged_str = NULL, *io_service_bytes_str = NULL, | |
2035 | *io_wait_time_str = NULL, *io_service_time_str = NULL; | |
2036 | unsigned long read = 0, write = 0; | |
2037 | unsigned long read_merged = 0, write_merged = 0; | |
2038 | unsigned long read_sectors = 0, write_sectors = 0; | |
2039 | unsigned long read_ticks = 0, write_ticks = 0; | |
2040 | unsigned long ios_pgr = 0, tot_ticks = 0, rq_ticks = 0; | |
2041 | unsigned long rd_svctm = 0, wr_svctm = 0, rd_wait = 0, wr_wait = 0; | |
2042 | char *line = NULL; | |
2043 | size_t linelen = 0, total_len = 0; | |
2044 | unsigned int major = 0, minor = 0; | |
2045 | int i = 0; | |
2046 | FILE *f; | |
2047 | ||
2048 | if (offset) | |
2049 | return -EINVAL; | |
2050 | ||
2051 | if (!cg) | |
2052 | return 0; | |
2053 | ||
2054 | if (!cgm_get_value("blkio", cg, "blkio.io_serviced", &io_serviced_str)) | |
2055 | return 0; | |
2056 | if (!cgm_get_value("blkio", cg, "blkio.io_merged", &io_merged_str)) | |
2057 | return 0; | |
2058 | if (!cgm_get_value("blkio", cg, "blkio.io_service_bytes", &io_service_bytes_str)) | |
2059 | return 0; | |
2060 | if (!cgm_get_value("blkio", cg, "blkio.io_wait_time", &io_wait_time_str)) | |
2061 | return 0; | |
2062 | if (!cgm_get_value("blkio", cg, "blkio.io_service_time", &io_service_time_str)) | |
2063 | return 0; | |
2064 | ||
2065 | ||
2066 | f = fopen("/proc/diskstats", "r"); | |
2067 | if (!f) | |
2068 | return 0; | |
2069 | ||
2070 | while (getline(&line, &linelen, f) != -1) { | |
2071 | size_t l; | |
2072 | char *printme, lbuf[256]; | |
2073 | ||
2074 | i = sscanf(line, "%u %u %s", &major, &minor, dev_name); | |
2075 | if(i == 3){ | |
2076 | get_blkio_io_value(io_serviced_str, major, minor, "Read", &read); | |
2077 | get_blkio_io_value(io_serviced_str, major, minor, "Write", &write); | |
2078 | get_blkio_io_value(io_merged_str, major, minor, "Read", &read_merged); | |
2079 | get_blkio_io_value(io_merged_str, major, minor, "Write", &write_merged); | |
2080 | get_blkio_io_value(io_service_bytes_str, major, minor, "Read", &read_sectors); | |
2081 | read_sectors = read_sectors/512; | |
2082 | get_blkio_io_value(io_service_bytes_str, major, minor, "Write", &write_sectors); | |
2083 | write_sectors = write_sectors/512; | |
2084 | ||
2085 | get_blkio_io_value(io_service_time_str, major, minor, "Read", &rd_svctm); | |
2086 | rd_svctm = rd_svctm/1000000; | |
2087 | get_blkio_io_value(io_wait_time_str, major, minor, "Read", &rd_wait); | |
2088 | rd_wait = rd_wait/1000000; | |
2089 | read_ticks = rd_svctm + rd_wait; | |
2090 | ||
2091 | get_blkio_io_value(io_service_time_str, major, minor, "Write", &wr_svctm); | |
2092 | wr_svctm = wr_svctm/1000000; | |
2093 | get_blkio_io_value(io_wait_time_str, major, minor, "Write", &wr_wait); | |
2094 | wr_wait = wr_wait/1000000; | |
2095 | write_ticks = wr_svctm + wr_wait; | |
2096 | ||
2097 | get_blkio_io_value(io_service_time_str, major, minor, "Total", &tot_ticks); | |
2098 | tot_ticks = tot_ticks/1000000; | |
2099 | }else{ | |
2100 | continue; | |
2101 | } | |
2102 | ||
2103 | memset(lbuf, 0, 256); | |
2104 | if (read || write || read_merged || write_merged || read_sectors || write_sectors || read_ticks || write_ticks) { | |
2105 | snprintf(lbuf, 256, "%u %u %s %lu %lu %lu %lu %lu %lu %lu %lu %lu %lu %lu\n", | |
2106 | major, minor, dev_name, read, read_merged, read_sectors, read_ticks, | |
2107 | write, write_merged, write_sectors, write_ticks, ios_pgr, tot_ticks, rq_ticks); | |
2108 | printme = lbuf; | |
2109 | } else | |
2110 | continue; | |
2111 | ||
2112 | l = snprintf(buf, size, "%s", printme); | |
2113 | buf += l; | |
2114 | size -= l; | |
2115 | total_len += l; | |
2116 | } | |
2117 | ||
2118 | fclose(f); | |
2119 | free(line); | |
2120 | return total_len; | |
2121 | } | |
2122 | ||
23ce2127 SH |
2123 | static off_t get_procfile_size(const char *which) |
2124 | { | |
2125 | FILE *f = fopen(which, "r"); | |
2126 | char *line = NULL; | |
2127 | size_t len = 0; | |
2128 | ssize_t sz, answer = 0; | |
2129 | if (!f) | |
2130 | return 0; | |
2131 | ||
2132 | while ((sz = getline(&line, &len, f)) != -1) | |
2133 | answer += sz; | |
2134 | fclose (f); | |
92c84dc4 | 2135 | free(line); |
23ce2127 SH |
2136 | |
2137 | return answer; | |
2138 | } | |
2139 | ||
758ad80c SH |
2140 | static int proc_getattr(const char *path, struct stat *sb) |
2141 | { | |
35629743 SH |
2142 | struct timespec now; |
2143 | ||
2144 | memset(sb, 0, sizeof(struct stat)); | |
2145 | if (clock_gettime(CLOCK_REALTIME, &now) < 0) | |
2146 | return -EINVAL; | |
2147 | sb->st_uid = sb->st_gid = 0; | |
2148 | sb->st_atim = sb->st_mtim = sb->st_ctim = now; | |
2149 | if (strcmp(path, "/proc") == 0) { | |
2150 | sb->st_mode = S_IFDIR | 00555; | |
2151 | sb->st_nlink = 2; | |
2152 | return 0; | |
2153 | } | |
2154 | if (strcmp(path, "/proc/meminfo") == 0 || | |
2155 | strcmp(path, "/proc/cpuinfo") == 0 || | |
2156 | strcmp(path, "/proc/uptime") == 0 || | |
49878439 YY |
2157 | strcmp(path, "/proc/stat") == 0 || |
2158 | strcmp(path, "/proc/diskstats") == 0) { | |
23ce2127 | 2159 | sb->st_size = get_procfile_size(path); |
35629743 SH |
2160 | sb->st_mode = S_IFREG | 00444; |
2161 | sb->st_nlink = 1; | |
2162 | return 0; | |
2163 | } | |
2164 | ||
2165 | return -ENOENT; | |
2166 | } | |
2167 | ||
2168 | static int proc_readdir(const char *path, void *buf, fuse_fill_dir_t filler, off_t offset, | |
2169 | struct fuse_file_info *fi) | |
2170 | { | |
2171 | if (filler(buf, "cpuinfo", NULL, 0) != 0 || | |
2172 | filler(buf, "meminfo", NULL, 0) != 0 || | |
2173 | filler(buf, "stat", NULL, 0) != 0 || | |
49878439 YY |
2174 | filler(buf, "uptime", NULL, 0) != 0 || |
2175 | filler(buf, "diskstats", NULL, 0) != 0) | |
758ad80c | 2176 | return -EINVAL; |
758ad80c SH |
2177 | return 0; |
2178 | } | |
2179 | ||
35629743 SH |
2180 | static int proc_open(const char *path, struct fuse_file_info *fi) |
2181 | { | |
96fc5ee6 SH |
2182 | int type = -1; |
2183 | struct file_info *info; | |
2184 | ||
2185 | if (strcmp(path, "/proc/meminfo") == 0) | |
2186 | type = LXC_TYPE_PROC_MEMINFO; | |
2187 | else if (strcmp(path, "/proc/cpuinfo") == 0) | |
2188 | type = LXC_TYPE_PROC_CPUINFO; | |
2189 | else if (strcmp(path, "/proc/uptime") == 0) | |
2190 | type = LXC_TYPE_PROC_UPTIME; | |
2191 | else if (strcmp(path, "/proc/stat") == 0) | |
2192 | type = LXC_TYPE_PROC_STAT; | |
2193 | else if (strcmp(path, "/proc/diskstats") == 0) | |
2194 | type = LXC_TYPE_PROC_DISKSTATS; | |
2195 | if (type == -1) | |
2196 | return -ENOENT; | |
2197 | ||
2198 | info = NIH_MUST( nih_alloc(NULL, sizeof(*info)) ); | |
2199 | memset(info, 0, sizeof(*info)); | |
2200 | info->type = type; | |
2201 | ||
2202 | fi->fh = (unsigned long)info; | |
2203 | return 0; | |
2204 | } | |
2205 | ||
2206 | static int proc_release(const char *path, struct fuse_file_info *fi) | |
2207 | { | |
2208 | struct file_info *f = (struct file_info *)fi->fh; | |
2209 | ||
2210 | do_release_file_info(f); | |
2211 | return 0; | |
35629743 SH |
2212 | } |
2213 | ||
35629743 SH |
2214 | static int proc_read(const char *path, char *buf, size_t size, off_t offset, |
2215 | struct fuse_file_info *fi) | |
2216 | { | |
96fc5ee6 SH |
2217 | struct file_info *f = (struct file_info *) fi->fh; |
2218 | ||
2219 | switch (f->type) { | |
2220 | case LXC_TYPE_PROC_MEMINFO: | |
23ce2127 | 2221 | return proc_meminfo_read(buf, size, offset, fi); |
96fc5ee6 | 2222 | case LXC_TYPE_PROC_CPUINFO: |
23ce2127 | 2223 | return proc_cpuinfo_read(buf, size, offset, fi); |
96fc5ee6 | 2224 | case LXC_TYPE_PROC_UPTIME: |
23ce2127 | 2225 | return proc_uptime_read(buf, size, offset, fi); |
96fc5ee6 | 2226 | case LXC_TYPE_PROC_STAT: |
23ce2127 | 2227 | return proc_stat_read(buf, size, offset, fi); |
96fc5ee6 | 2228 | case LXC_TYPE_PROC_DISKSTATS: |
49878439 | 2229 | return proc_diskstats_read(buf, size, offset, fi); |
96fc5ee6 SH |
2230 | default: |
2231 | return -EINVAL; | |
2232 | } | |
35629743 SH |
2233 | } |
2234 | ||
2ad6d2bd SH |
2235 | /* |
2236 | * FUSE ops for / | |
2237 | * these just delegate to the /proc and /cgroup ops as | |
2238 | * needed | |
2239 | */ | |
758ad80c SH |
2240 | |
2241 | static int lxcfs_getattr(const char *path, struct stat *sb) | |
2242 | { | |
2243 | if (strcmp(path, "/") == 0) { | |
2244 | sb->st_mode = S_IFDIR | 00755; | |
2245 | sb->st_nlink = 2; | |
2246 | return 0; | |
2247 | } | |
2248 | if (strncmp(path, "/cgroup", 7) == 0) { | |
2249 | return cg_getattr(path, sb); | |
2250 | } | |
35629743 | 2251 | if (strncmp(path, "/proc", 5) == 0) { |
758ad80c SH |
2252 | return proc_getattr(path, sb); |
2253 | } | |
2254 | return -EINVAL; | |
2255 | } | |
2256 | ||
2257 | static int lxcfs_opendir(const char *path, struct fuse_file_info *fi) | |
2258 | { | |
2259 | if (strcmp(path, "/") == 0) | |
2260 | return 0; | |
2261 | ||
2262 | if (strncmp(path, "/cgroup", 7) == 0) { | |
2263 | return cg_opendir(path, fi); | |
2264 | } | |
35629743 SH |
2265 | if (strcmp(path, "/proc") == 0) |
2266 | return 0; | |
2267 | return -ENOENT; | |
758ad80c SH |
2268 | } |
2269 | ||
2270 | static int lxcfs_readdir(const char *path, void *buf, fuse_fill_dir_t filler, off_t offset, | |
2271 | struct fuse_file_info *fi) | |
2272 | { | |
2273 | if (strcmp(path, "/") == 0) { | |
2274 | if (filler(buf, "proc", NULL, 0) != 0 || | |
2275 | filler(buf, "cgroup", NULL, 0) != 0) | |
2276 | return -EINVAL; | |
2277 | return 0; | |
2278 | } | |
35629743 | 2279 | if (strncmp(path, "/cgroup", 7) == 0) |
758ad80c | 2280 | return cg_readdir(path, buf, filler, offset, fi); |
35629743 SH |
2281 | if (strcmp(path, "/proc") == 0) |
2282 | return proc_readdir(path, buf, filler, offset, fi); | |
758ad80c SH |
2283 | return -EINVAL; |
2284 | } | |
2285 | ||
2286 | static int lxcfs_releasedir(const char *path, struct fuse_file_info *fi) | |
2287 | { | |
2288 | if (strcmp(path, "/") == 0) | |
2289 | return 0; | |
2290 | if (strncmp(path, "/cgroup", 7) == 0) { | |
2291 | return cg_releasedir(path, fi); | |
2292 | } | |
35629743 SH |
2293 | if (strcmp(path, "/proc") == 0) |
2294 | return 0; | |
758ad80c SH |
2295 | return -EINVAL; |
2296 | } | |
2297 | ||
99978832 SH |
2298 | static int lxcfs_open(const char *path, struct fuse_file_info *fi) |
2299 | { | |
35629743 | 2300 | if (strncmp(path, "/cgroup", 7) == 0) |
99978832 | 2301 | return cg_open(path, fi); |
35629743 SH |
2302 | if (strncmp(path, "/proc", 5) == 0) |
2303 | return proc_open(path, fi); | |
99978832 SH |
2304 | |
2305 | return -EINVAL; | |
2306 | } | |
2307 | ||
2308 | static int lxcfs_read(const char *path, char *buf, size_t size, off_t offset, | |
2309 | struct fuse_file_info *fi) | |
2310 | { | |
35629743 | 2311 | if (strncmp(path, "/cgroup", 7) == 0) |
99978832 | 2312 | return cg_read(path, buf, size, offset, fi); |
35629743 SH |
2313 | if (strncmp(path, "/proc", 5) == 0) |
2314 | return proc_read(path, buf, size, offset, fi); | |
99978832 SH |
2315 | |
2316 | return -EINVAL; | |
2317 | } | |
2318 | ||
2ad6d2bd SH |
2319 | int lxcfs_write(const char *path, const char *buf, size_t size, off_t offset, |
2320 | struct fuse_file_info *fi) | |
2321 | { | |
2322 | if (strncmp(path, "/cgroup", 7) == 0) { | |
2323 | return cg_write(path, buf, size, offset, fi); | |
2324 | } | |
2325 | ||
2326 | return -EINVAL; | |
2327 | } | |
2328 | ||
99978832 SH |
2329 | static int lxcfs_flush(const char *path, struct fuse_file_info *fi) |
2330 | { | |
2331 | return 0; | |
2332 | } | |
2333 | ||
2334 | static int lxcfs_release(const char *path, struct fuse_file_info *fi) | |
758ad80c | 2335 | { |
8f6e8f5e SH |
2336 | if (strncmp(path, "/cgroup", 7) == 0) |
2337 | return cg_release(path, fi); | |
8f6e8f5e | 2338 | if (strncmp(path, "/proc", 5) == 0) |
96fc5ee6 | 2339 | return proc_release(path, fi); |
8f6e8f5e SH |
2340 | |
2341 | return -EINVAL; | |
99978832 SH |
2342 | } |
2343 | ||
2344 | static int lxcfs_fsync(const char *path, int datasync, struct fuse_file_info *fi) | |
2345 | { | |
2346 | return 0; | |
758ad80c SH |
2347 | } |
2348 | ||
ab54b798 SH |
2349 | int lxcfs_mkdir(const char *path, mode_t mode) |
2350 | { | |
2351 | if (strncmp(path, "/cgroup", 7) == 0) | |
2352 | return cg_mkdir(path, mode); | |
2353 | ||
2354 | return -EINVAL; | |
2355 | } | |
2356 | ||
341b21ad SH |
2357 | int lxcfs_chown(const char *path, uid_t uid, gid_t gid) |
2358 | { | |
2359 | if (strncmp(path, "/cgroup", 7) == 0) | |
2360 | return cg_chown(path, uid, gid); | |
2361 | ||
2362 | return -EINVAL; | |
2363 | } | |
2364 | ||
2ad6d2bd SH |
2365 | /* |
2366 | * cat first does a truncate before doing ops->write. This doesn't | |
2367 | * really make sense for cgroups. So just return 0 always but do | |
2368 | * nothing. | |
2369 | */ | |
2370 | int lxcfs_truncate(const char *path, off_t newsize) | |
2371 | { | |
2372 | if (strncmp(path, "/cgroup", 7) == 0) | |
2373 | return 0; | |
2374 | return -EINVAL; | |
2375 | } | |
2376 | ||
50d8d5b5 SH |
2377 | int lxcfs_rmdir(const char *path) |
2378 | { | |
2379 | if (strncmp(path, "/cgroup", 7) == 0) | |
2380 | return cg_rmdir(path); | |
2381 | return -EINVAL; | |
2382 | } | |
2383 | ||
fd2e4e03 SH |
2384 | int lxcfs_chmod(const char *path, mode_t mode) |
2385 | { | |
2386 | if (strncmp(path, "/cgroup", 7) == 0) | |
2387 | return cg_chmod(path, mode); | |
2388 | return -EINVAL; | |
2389 | } | |
2390 | ||
758ad80c SH |
2391 | const struct fuse_operations lxcfs_ops = { |
2392 | .getattr = lxcfs_getattr, | |
2393 | .readlink = NULL, | |
2394 | .getdir = NULL, | |
2395 | .mknod = NULL, | |
ab54b798 | 2396 | .mkdir = lxcfs_mkdir, |
758ad80c | 2397 | .unlink = NULL, |
50d8d5b5 | 2398 | .rmdir = lxcfs_rmdir, |
758ad80c SH |
2399 | .symlink = NULL, |
2400 | .rename = NULL, | |
2401 | .link = NULL, | |
fd2e4e03 | 2402 | .chmod = lxcfs_chmod, |
341b21ad | 2403 | .chown = lxcfs_chown, |
2ad6d2bd | 2404 | .truncate = lxcfs_truncate, |
758ad80c | 2405 | .utime = NULL, |
99978832 SH |
2406 | |
2407 | .open = lxcfs_open, | |
2408 | .read = lxcfs_read, | |
2409 | .release = lxcfs_release, | |
2ad6d2bd | 2410 | .write = lxcfs_write, |
99978832 | 2411 | |
758ad80c | 2412 | .statfs = NULL, |
99978832 SH |
2413 | .flush = lxcfs_flush, |
2414 | .fsync = lxcfs_fsync, | |
758ad80c SH |
2415 | |
2416 | .setxattr = NULL, | |
2417 | .getxattr = NULL, | |
2418 | .listxattr = NULL, | |
2419 | .removexattr = NULL, | |
2420 | ||
2421 | .opendir = lxcfs_opendir, | |
2422 | .readdir = lxcfs_readdir, | |
2423 | .releasedir = lxcfs_releasedir, | |
2424 | ||
2425 | .fsyncdir = NULL, | |
2426 | .init = NULL, | |
2427 | .destroy = NULL, | |
2428 | .access = NULL, | |
2429 | .create = NULL, | |
2430 | .ftruncate = NULL, | |
2431 | .fgetattr = NULL, | |
2432 | }; | |
2433 | ||
99978832 | 2434 | static void usage(const char *me) |
758ad80c SH |
2435 | { |
2436 | fprintf(stderr, "Usage:\n"); | |
2437 | fprintf(stderr, "\n"); | |
2438 | fprintf(stderr, "%s [FUSE and mount options] mountpoint\n", me); | |
2439 | exit(1); | |
2440 | } | |
2441 | ||
99978832 | 2442 | static bool is_help(char *w) |
758ad80c SH |
2443 | { |
2444 | if (strcmp(w, "-h") == 0 || | |
2445 | strcmp(w, "--help") == 0 || | |
2446 | strcmp(w, "-help") == 0 || | |
2447 | strcmp(w, "help") == 0) | |
2448 | return true; | |
2449 | return false; | |
2450 | } | |
2451 | ||
2452 | int main(int argc, char *argv[]) | |
2453 | { | |
2454 | int ret; | |
2455 | struct lxcfs_state *d; | |
2456 | ||
2457 | if (argc < 2 || is_help(argv[1])) | |
2458 | usage(argv[0]); | |
2459 | ||
2460 | d = malloc(sizeof(*d)); | |
2461 | if (!d) | |
2462 | return -1; | |
2463 | ||
2464 | if (!cgm_escape_cgroup()) | |
2465 | fprintf(stderr, "WARNING: failed to escape to root cgroup\n"); | |
2466 | ||
2467 | if (!cgm_get_controllers(&d->subsystems)) | |
2468 | return -1; | |
2469 | ||
2470 | ret = fuse_main(argc, argv, &lxcfs_ops, d); | |
2471 | ||
2472 | return ret; | |
2183082c | 2473 | } |