1670 lines
42 KiB
C
1670 lines
42 KiB
C
/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
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/***
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This file is part of systemd.
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Copyright 2010 Lennart Poettering
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systemd is free software; you can redistribute it and/or modify it
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under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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systemd is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with systemd; If not, see <http://www.gnu.org/licenses/>.
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***/
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#include <errno.h>
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#include <unistd.h>
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#include <signal.h>
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#include <string.h>
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#include <stdlib.h>
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#include <dirent.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <ftw.h>
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#include "cgroup-util.h"
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#include "log.h"
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#include "set.h"
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#include "macro.h"
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#include "util.h"
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#include "path-util.h"
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#include "strv.h"
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#include "unit-name.h"
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#include "fileio.h"
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int cg_enumerate_processes(const char *controller, const char *path, FILE **_f) {
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_cleanup_free_ char *fs = NULL;
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FILE *f;
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int r;
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assert(_f);
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r = cg_get_path(controller, path, "cgroup.procs", &fs);
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if (r < 0)
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return r;
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f = fopen(fs, "re");
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if (!f)
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return -errno;
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*_f = f;
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return 0;
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}
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int cg_read_pid(FILE *f, pid_t *_pid) {
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unsigned long ul;
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/* Note that the cgroup.procs might contain duplicates! See
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* cgroups.txt for details. */
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assert(f);
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assert(_pid);
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errno = 0;
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if (fscanf(f, "%lu", &ul) != 1) {
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if (feof(f))
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return 0;
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return errno ? -errno : -EIO;
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}
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if (ul <= 0)
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return -EIO;
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*_pid = (pid_t) ul;
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return 1;
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}
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int cg_enumerate_subgroups(const char *controller, const char *path, DIR **_d) {
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_cleanup_free_ char *fs = NULL;
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int r;
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DIR *d;
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assert(_d);
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/* This is not recursive! */
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r = cg_get_path(controller, path, NULL, &fs);
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if (r < 0)
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return r;
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d = opendir(fs);
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if (!d)
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return -errno;
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*_d = d;
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return 0;
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}
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int cg_read_subgroup(DIR *d, char **fn) {
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struct dirent *de;
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assert(d);
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assert(fn);
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FOREACH_DIRENT(de, d, return -errno) {
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char *b;
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if (de->d_type != DT_DIR)
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continue;
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if (streq(de->d_name, ".") ||
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streq(de->d_name, ".."))
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continue;
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b = strdup(de->d_name);
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if (!b)
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return -ENOMEM;
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*fn = b;
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return 1;
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}
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return 0;
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}
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int cg_rmdir(const char *controller, const char *path, bool honour_sticky) {
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_cleanup_free_ char *p = NULL;
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int r;
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r = cg_get_path(controller, path, NULL, &p);
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if (r < 0)
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return r;
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if (honour_sticky) {
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char *fn;
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/* If the sticky bit is set on cgroup.procs, don't
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* remove the directory */
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fn = strappend(p, "/cgroup.procs");
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if (!fn)
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return -ENOMEM;
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r = file_is_priv_sticky(fn);
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free(fn);
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if (r > 0)
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return 0;
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/* Compatibility ... */
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fn = strappend(p, "/tasks");
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if (!fn)
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return -ENOMEM;
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r = file_is_priv_sticky(fn);
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free(fn);
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if (r > 0)
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return 0;
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}
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r = rmdir(p);
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if (r < 0 && errno != ENOENT)
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return -errno;
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return 0;
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}
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int cg_kill(const char *controller, const char *path, int sig, bool sigcont, bool ignore_self, Set *s) {
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_cleanup_set_free_ Set *allocated_set = NULL;
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bool done = false;
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int r, ret = 0;
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pid_t my_pid;
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assert(sig >= 0);
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/* This goes through the tasks list and kills them all. This
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* is repeated until no further processes are added to the
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* tasks list, to properly handle forking processes */
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if (!s) {
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s = allocated_set = set_new(trivial_hash_func, trivial_compare_func);
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if (!s)
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return -ENOMEM;
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}
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my_pid = getpid();
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do {
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_cleanup_fclose_ FILE *f = NULL;
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pid_t pid = 0;
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done = true;
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r = cg_enumerate_processes(controller, path, &f);
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if (r < 0) {
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if (ret >= 0 && r != -ENOENT)
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return r;
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return ret;
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}
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while ((r = cg_read_pid(f, &pid)) > 0) {
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if (ignore_self && pid == my_pid)
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continue;
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if (set_get(s, LONG_TO_PTR(pid)) == LONG_TO_PTR(pid))
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continue;
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/* If we haven't killed this process yet, kill
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* it */
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if (kill(pid, sig) < 0) {
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if (ret >= 0 && errno != ESRCH)
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ret = -errno;
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} else if (ret == 0) {
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if (sigcont)
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kill(pid, SIGCONT);
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ret = 1;
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}
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done = false;
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r = set_put(s, LONG_TO_PTR(pid));
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if (r < 0) {
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if (ret >= 0)
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return r;
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return ret;
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}
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}
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if (r < 0) {
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if (ret >= 0)
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return r;
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return ret;
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}
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/* To avoid racing against processes which fork
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* quicker than we can kill them we repeat this until
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* no new pids need to be killed. */
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} while (!done);
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return ret;
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}
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int cg_kill_recursive(const char *controller, const char *path, int sig, bool sigcont, bool ignore_self, bool rem, Set *s) {
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_cleanup_set_free_ Set *allocated_set = NULL;
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_cleanup_closedir_ DIR *d = NULL;
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int r, ret = 0;
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char *fn;
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assert(path);
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assert(sig >= 0);
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if (!s) {
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s = allocated_set = set_new(trivial_hash_func, trivial_compare_func);
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if (!s)
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return -ENOMEM;
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}
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ret = cg_kill(controller, path, sig, sigcont, ignore_self, s);
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r = cg_enumerate_subgroups(controller, path, &d);
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if (r < 0) {
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if (ret >= 0 && r != -ENOENT)
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return r;
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return ret;
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}
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while ((r = cg_read_subgroup(d, &fn)) > 0) {
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_cleanup_free_ char *p = NULL;
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p = strjoin(path, "/", fn, NULL);
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free(fn);
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if (!p)
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return -ENOMEM;
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r = cg_kill_recursive(controller, p, sig, sigcont, ignore_self, rem, s);
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if (ret >= 0 && r != 0)
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ret = r;
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}
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if (ret >= 0 && r < 0)
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ret = r;
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if (rem) {
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r = cg_rmdir(controller, path, true);
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if (r < 0 && ret >= 0 && r != -ENOENT && r != -EBUSY)
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return r;
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}
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return ret;
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}
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int cg_kill_recursive_and_wait(const char *controller, const char *path, bool rem) {
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unsigned i;
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assert(path);
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/* This safely kills all processes; first it sends a SIGTERM,
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* then checks 8 times after 200ms whether the group is now
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* empty, then kills everything that is left with SIGKILL and
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* finally checks 5 times after 200ms each whether the group
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* is finally empty. */
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for (i = 0; i < 15; i++) {
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int sig, r;
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if (i <= 0)
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sig = SIGTERM;
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else if (i == 9)
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sig = SIGKILL;
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else
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sig = 0;
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r = cg_kill_recursive(controller, path, sig, true, true, rem, NULL);
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if (r <= 0)
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return r;
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usleep(200 * USEC_PER_MSEC);
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}
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return 0;
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}
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int cg_migrate(const char *cfrom, const char *pfrom, const char *cto, const char *pto, bool ignore_self) {
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bool done = false;
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_cleanup_set_free_ Set *s = NULL;
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int r, ret = 0;
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pid_t my_pid;
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assert(cfrom);
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assert(pfrom);
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assert(cto);
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assert(pto);
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s = set_new(trivial_hash_func, trivial_compare_func);
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if (!s)
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return -ENOMEM;
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my_pid = getpid();
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do {
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_cleanup_fclose_ FILE *f = NULL;
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pid_t pid = 0;
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done = true;
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r = cg_enumerate_processes(cfrom, pfrom, &f);
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if (r < 0) {
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if (ret >= 0 && r != -ENOENT)
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return r;
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return ret;
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}
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while ((r = cg_read_pid(f, &pid)) > 0) {
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/* This might do weird stuff if we aren't a
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* single-threaded program. However, we
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* luckily know we are not */
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if (ignore_self && pid == my_pid)
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continue;
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if (set_get(s, LONG_TO_PTR(pid)) == LONG_TO_PTR(pid))
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continue;
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r = cg_attach(cto, pto, pid);
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if (r < 0) {
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if (ret >= 0 && r != -ESRCH)
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ret = r;
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} else if (ret == 0)
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ret = 1;
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done = false;
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r = set_put(s, LONG_TO_PTR(pid));
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if (r < 0) {
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if (ret >= 0)
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return r;
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return ret;
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}
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}
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if (r < 0) {
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if (ret >= 0)
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return r;
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return ret;
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}
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} while (!done);
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return ret;
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}
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int cg_migrate_recursive(const char *cfrom, const char *pfrom, const char *cto, const char *pto, bool ignore_self, bool rem) {
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_cleanup_closedir_ DIR *d = NULL;
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int r, ret = 0;
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char *fn;
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assert(cfrom);
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assert(pfrom);
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assert(cto);
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assert(pto);
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ret = cg_migrate(cfrom, pfrom, cto, pto, ignore_self);
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r = cg_enumerate_subgroups(cfrom, pfrom, &d);
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if (r < 0) {
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if (ret >= 0 && r != -ENOENT)
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return r;
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return ret;
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}
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while ((r = cg_read_subgroup(d, &fn)) > 0) {
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_cleanup_free_ char *p = NULL;
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p = strjoin(pfrom, "/", fn, NULL);
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free(fn);
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if (!p) {
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if (ret >= 0)
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return -ENOMEM;
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return ret;
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}
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r = cg_migrate_recursive(cfrom, p, cto, pto, ignore_self, rem);
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if (r != 0 && ret >= 0)
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ret = r;
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}
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if (r < 0 && ret >= 0)
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ret = r;
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if (rem) {
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r = cg_rmdir(cfrom, pfrom, true);
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if (r < 0 && ret >= 0 && r != -ENOENT && r != -EBUSY)
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return r;
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}
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return ret;
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}
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static const char *normalize_controller(const char *controller) {
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assert(controller);
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if (streq(controller, SYSTEMD_CGROUP_CONTROLLER))
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return "systemd";
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else if (startswith(controller, "name="))
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return controller + 5;
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else
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return controller;
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}
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static int join_path(const char *controller, const char *path, const char *suffix, char **fs) {
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char *t = NULL;
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if (controller) {
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if (path && suffix)
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t = strjoin("/sys/fs/cgroup/", controller, "/", path, "/", suffix, NULL);
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else if (path)
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t = strjoin("/sys/fs/cgroup/", controller, "/", path, NULL);
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else if (suffix)
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t = strjoin("/sys/fs/cgroup/", controller, "/", suffix, NULL);
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else
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t = strappend("/sys/fs/cgroup/", controller);
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} else {
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if (path && suffix)
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t = strjoin(path, "/", suffix, NULL);
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else if (path)
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t = strdup(path);
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else
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return -EINVAL;
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}
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if (!t)
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return -ENOMEM;
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path_kill_slashes(t);
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*fs = t;
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return 0;
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}
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int cg_get_path(const char *controller, const char *path, const char *suffix, char **fs) {
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const char *p;
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static __thread bool good = false;
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assert(fs);
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if (controller && !cg_controller_is_valid(controller, true))
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return -EINVAL;
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if (_unlikely_(!good)) {
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int r;
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r = path_is_mount_point("/sys/fs/cgroup", false);
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if (r <= 0)
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return r < 0 ? r : -ENOENT;
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/* Cache this to save a few stat()s */
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good = true;
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}
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p = controller ? normalize_controller(controller) : NULL;
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return join_path(p, path, suffix, fs);
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}
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static int check_hierarchy(const char *p) {
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char *cc;
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assert(p);
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/* Check if this controller actually really exists */
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cc = alloca(sizeof("/sys/fs/cgroup/") + strlen(p));
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strcpy(stpcpy(cc, "/sys/fs/cgroup/"), p);
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if (access(cc, F_OK) < 0)
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return -errno;
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return 0;
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}
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int cg_get_path_and_check(const char *controller, const char *path, const char *suffix, char **fs) {
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const char *p;
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int r;
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assert(fs);
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if (!cg_controller_is_valid(controller, true))
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return -EINVAL;
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/* Normalize the controller syntax */
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p = normalize_controller(controller);
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/* Check if this controller actually really exists */
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r = check_hierarchy(p);
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if (r < 0)
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return r;
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return join_path(p, path, suffix, fs);
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}
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static int trim_cb(const char *path, const struct stat *sb, int typeflag, struct FTW *ftwbuf) {
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char *p;
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bool is_sticky;
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if (typeflag != FTW_DP)
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return 0;
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if (ftwbuf->level < 1)
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return 0;
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p = strappend(path, "/cgroup.procs");
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if (!p) {
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errno = ENOMEM;
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return 1;
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}
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is_sticky = file_is_priv_sticky(p) > 0;
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free(p);
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|
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if (is_sticky)
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return 0;
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/* Compatibility */
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p = strappend(path, "/tasks");
|
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if (!p) {
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errno = ENOMEM;
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return 1;
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}
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is_sticky = file_is_priv_sticky(p) > 0;
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free(p);
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|
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if (is_sticky)
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return 0;
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rmdir(path);
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return 0;
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}
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|
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int cg_trim(const char *controller, const char *path, bool delete_root) {
|
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_cleanup_free_ char *fs = NULL;
|
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int r = 0;
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|
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assert(path);
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|
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r = cg_get_path(controller, path, NULL, &fs);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
errno = 0;
|
|
if (nftw(fs, trim_cb, 64, FTW_DEPTH|FTW_MOUNT|FTW_PHYS) != 0)
|
|
r = errno ? -errno : -EIO;
|
|
|
|
if (delete_root) {
|
|
bool is_sticky;
|
|
char *p;
|
|
|
|
p = strappend(fs, "/cgroup.procs");
|
|
if (!p)
|
|
return -ENOMEM;
|
|
|
|
is_sticky = file_is_priv_sticky(p) > 0;
|
|
free(p);
|
|
|
|
if (!is_sticky) {
|
|
p = strappend(fs, "/tasks");
|
|
if (!p)
|
|
return -ENOMEM;
|
|
|
|
is_sticky = file_is_priv_sticky(p) > 0;
|
|
free(p);
|
|
}
|
|
|
|
if (!is_sticky)
|
|
if (rmdir(fs) < 0 && errno != ENOENT && r == 0)
|
|
return -errno;
|
|
}
|
|
|
|
return r;
|
|
}
|
|
|
|
int cg_delete(const char *controller, const char *path) {
|
|
_cleanup_free_ char *parent = NULL;
|
|
int r;
|
|
|
|
assert(path);
|
|
|
|
r = path_get_parent(path, &parent);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
r = cg_migrate_recursive(controller, path, controller, parent, false, true);
|
|
return r == -ENOENT ? 0 : r;
|
|
}
|
|
|
|
int cg_attach(const char *controller, const char *path, pid_t pid) {
|
|
_cleanup_free_ char *fs = NULL;
|
|
char c[DECIMAL_STR_MAX(pid_t) + 2];
|
|
int r;
|
|
|
|
assert(path);
|
|
assert(pid >= 0);
|
|
|
|
r = cg_get_path_and_check(controller, path, "cgroup.procs", &fs);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
if (pid == 0)
|
|
pid = getpid();
|
|
|
|
snprintf(c, sizeof(c), "%lu\n", (unsigned long) pid);
|
|
|
|
return write_string_file(fs, c);
|
|
}
|
|
|
|
int cg_set_group_access(
|
|
const char *controller,
|
|
const char *path,
|
|
mode_t mode,
|
|
uid_t uid,
|
|
gid_t gid) {
|
|
|
|
_cleanup_free_ char *fs = NULL;
|
|
int r;
|
|
|
|
assert(path);
|
|
|
|
if (mode != (mode_t) -1)
|
|
mode &= 0777;
|
|
|
|
r = cg_get_path(controller, path, NULL, &fs);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
return chmod_and_chown(fs, mode, uid, gid);
|
|
}
|
|
|
|
int cg_set_task_access(
|
|
const char *controller,
|
|
const char *path,
|
|
mode_t mode,
|
|
uid_t uid,
|
|
gid_t gid,
|
|
int sticky) {
|
|
|
|
_cleanup_free_ char *fs = NULL, *procs = NULL;
|
|
int r;
|
|
|
|
assert(path);
|
|
|
|
if (mode == (mode_t) -1 && uid == (uid_t) -1 && gid == (gid_t) -1 && sticky < 0)
|
|
return 0;
|
|
|
|
if (mode != (mode_t) -1)
|
|
mode &= 0666;
|
|
|
|
r = cg_get_path(controller, path, "cgroup.procs", &fs);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
if (sticky >= 0 && mode != (mode_t) -1)
|
|
/* Both mode and sticky param are passed */
|
|
mode |= (sticky ? S_ISVTX : 0);
|
|
else if ((sticky >= 0 && mode == (mode_t) -1) ||
|
|
(mode != (mode_t) -1 && sticky < 0)) {
|
|
struct stat st;
|
|
|
|
/* Only one param is passed, hence read the current
|
|
* mode from the file itself */
|
|
|
|
r = lstat(fs, &st);
|
|
if (r < 0)
|
|
return -errno;
|
|
|
|
if (mode == (mode_t) -1)
|
|
/* No mode set, we just shall set the sticky bit */
|
|
mode = (st.st_mode & ~S_ISVTX) | (sticky ? S_ISVTX : 0);
|
|
else
|
|
/* Only mode set, leave sticky bit untouched */
|
|
mode = (st.st_mode & ~0777) | mode;
|
|
}
|
|
|
|
r = chmod_and_chown(fs, mode, uid, gid);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
/* Compatibility, Always keep values for "tasks" in sync with
|
|
* "cgroup.procs" */
|
|
r = cg_get_path(controller, path, "tasks", &procs);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
return chmod_and_chown(procs, mode, uid, gid);
|
|
}
|
|
|
|
int cg_pid_get_path(const char *controller, pid_t pid, char **path) {
|
|
_cleanup_fclose_ FILE *f = NULL;
|
|
char line[LINE_MAX];
|
|
const char *fs;
|
|
size_t cs;
|
|
|
|
assert(path);
|
|
assert(pid >= 0);
|
|
|
|
if (controller) {
|
|
if (!cg_controller_is_valid(controller, true))
|
|
return -EINVAL;
|
|
|
|
controller = normalize_controller(controller);
|
|
} else
|
|
controller = SYSTEMD_CGROUP_CONTROLLER;
|
|
|
|
if (pid == 0)
|
|
fs = "/proc/self/cgroup";
|
|
else
|
|
fs = procfs_file_alloca(pid, "cgroup");
|
|
|
|
f = fopen(fs, "re");
|
|
if (!f)
|
|
return errno == ENOENT ? -ESRCH : -errno;
|
|
|
|
cs = strlen(controller);
|
|
|
|
FOREACH_LINE(line, f, return -errno) {
|
|
char *l, *p, *w, *e;
|
|
size_t k;
|
|
char *state;
|
|
bool found = false;
|
|
|
|
truncate_nl(line);
|
|
|
|
l = strchr(line, ':');
|
|
if (!l)
|
|
continue;
|
|
|
|
l++;
|
|
e = strchr(l, ':');
|
|
if (!e)
|
|
continue;
|
|
|
|
*e = 0;
|
|
|
|
FOREACH_WORD_SEPARATOR(w, k, l, ",", state) {
|
|
|
|
if (k == cs && memcmp(w, controller, cs) == 0) {
|
|
found = true;
|
|
break;
|
|
}
|
|
|
|
if (k == 5 + cs &&
|
|
memcmp(w, "name=", 5) == 0 &&
|
|
memcmp(w+5, controller, cs) == 0) {
|
|
found = true;
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (!found)
|
|
continue;
|
|
|
|
p = strdup(e + 1);
|
|
if (!p)
|
|
return -ENOMEM;
|
|
|
|
*path = p;
|
|
return 0;
|
|
}
|
|
|
|
return -ENOENT;
|
|
}
|
|
|
|
int cg_install_release_agent(const char *controller, const char *agent) {
|
|
_cleanup_free_ char *fs = NULL, *contents = NULL;
|
|
char *sc;
|
|
int r;
|
|
|
|
assert(agent);
|
|
|
|
r = cg_get_path(controller, NULL, "release_agent", &fs);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
r = read_one_line_file(fs, &contents);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
sc = strstrip(contents);
|
|
if (sc[0] == 0) {
|
|
r = write_string_file(fs, agent);
|
|
if (r < 0)
|
|
return r;
|
|
} else if (!streq(sc, agent))
|
|
return -EEXIST;
|
|
|
|
free(fs);
|
|
fs = NULL;
|
|
r = cg_get_path(controller, NULL, "notify_on_release", &fs);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
free(contents);
|
|
contents = NULL;
|
|
r = read_one_line_file(fs, &contents);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
sc = strstrip(contents);
|
|
if (streq(sc, "0")) {
|
|
r = write_string_file(fs, "1");
|
|
if (r < 0)
|
|
return r;
|
|
|
|
return 1;
|
|
}
|
|
|
|
if (!streq(sc, "1"))
|
|
return -EIO;
|
|
|
|
return 0;
|
|
}
|
|
|
|
int cg_is_empty(const char *controller, const char *path, bool ignore_self) {
|
|
_cleanup_fclose_ FILE *f = NULL;
|
|
pid_t pid = 0, self_pid;
|
|
bool found = false;
|
|
int r;
|
|
|
|
assert(path);
|
|
|
|
r = cg_enumerate_processes(controller, path, &f);
|
|
if (r < 0)
|
|
return r == -ENOENT ? 1 : r;
|
|
|
|
self_pid = getpid();
|
|
|
|
while ((r = cg_read_pid(f, &pid)) > 0) {
|
|
|
|
if (ignore_self && pid == self_pid)
|
|
continue;
|
|
|
|
found = true;
|
|
break;
|
|
}
|
|
|
|
if (r < 0)
|
|
return r;
|
|
|
|
return !found;
|
|
}
|
|
|
|
int cg_is_empty_by_spec(const char *spec, bool ignore_self) {
|
|
_cleanup_free_ char *controller = NULL, *path = NULL;
|
|
int r;
|
|
|
|
assert(spec);
|
|
|
|
r = cg_split_spec(spec, &controller, &path);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
return cg_is_empty(controller, path, ignore_self);
|
|
}
|
|
|
|
int cg_is_empty_recursive(const char *controller, const char *path, bool ignore_self) {
|
|
_cleanup_closedir_ DIR *d = NULL;
|
|
char *fn;
|
|
int r;
|
|
|
|
assert(path);
|
|
|
|
r = cg_is_empty(controller, path, ignore_self);
|
|
if (r <= 0)
|
|
return r;
|
|
|
|
r = cg_enumerate_subgroups(controller, path, &d);
|
|
if (r < 0)
|
|
return r == -ENOENT ? 1 : r;
|
|
|
|
while ((r = cg_read_subgroup(d, &fn)) > 0) {
|
|
_cleanup_free_ char *p = NULL;
|
|
|
|
p = strjoin(path, "/", fn, NULL);
|
|
free(fn);
|
|
if (!p)
|
|
return -ENOMEM;
|
|
|
|
r = cg_is_empty_recursive(controller, p, ignore_self);
|
|
if (r <= 0)
|
|
return r;
|
|
}
|
|
|
|
if (r < 0)
|
|
return r;
|
|
|
|
return 1;
|
|
}
|
|
|
|
int cg_split_spec(const char *spec, char **controller, char **path) {
|
|
const char *e;
|
|
char *t = NULL, *u = NULL;
|
|
_cleanup_free_ char *v = NULL;
|
|
|
|
assert(spec);
|
|
|
|
if (*spec == '/') {
|
|
if (!path_is_safe(spec))
|
|
return -EINVAL;
|
|
|
|
if (path) {
|
|
t = strdup(spec);
|
|
if (!t)
|
|
return -ENOMEM;
|
|
|
|
path_kill_slashes(t);
|
|
*path = t;
|
|
}
|
|
|
|
if (controller)
|
|
*controller = NULL;
|
|
|
|
return 0;
|
|
}
|
|
|
|
e = strchr(spec, ':');
|
|
if (!e) {
|
|
if (!cg_controller_is_valid(spec, true))
|
|
return -EINVAL;
|
|
|
|
if (controller) {
|
|
t = strdup(normalize_controller(spec));
|
|
if (!t)
|
|
return -ENOMEM;
|
|
|
|
*controller = t;
|
|
}
|
|
|
|
if (path)
|
|
*path = NULL;
|
|
|
|
return 0;
|
|
}
|
|
|
|
v = strndup(spec, e-spec);
|
|
if (!v)
|
|
return -ENOMEM;
|
|
t = strdup(normalize_controller(v));
|
|
if (!t)
|
|
return -ENOMEM;
|
|
if (!cg_controller_is_valid(t, true)) {
|
|
free(t);
|
|
return -EINVAL;
|
|
}
|
|
|
|
u = strdup(e+1);
|
|
if (!u) {
|
|
free(t);
|
|
return -ENOMEM;
|
|
}
|
|
if (!path_is_safe(u) ||
|
|
!path_is_absolute(u)) {
|
|
free(t);
|
|
free(u);
|
|
return -EINVAL;
|
|
}
|
|
|
|
path_kill_slashes(u);
|
|
|
|
if (controller)
|
|
*controller = t;
|
|
else
|
|
free(t);
|
|
|
|
if (path)
|
|
*path = u;
|
|
else
|
|
free(u);
|
|
|
|
return 0;
|
|
}
|
|
|
|
int cg_join_spec(const char *controller, const char *path, char **spec) {
|
|
char *s;
|
|
|
|
assert(path);
|
|
|
|
if (!controller)
|
|
controller = "systemd";
|
|
else {
|
|
if (!cg_controller_is_valid(controller, true))
|
|
return -EINVAL;
|
|
|
|
controller = normalize_controller(controller);
|
|
}
|
|
|
|
if (!path_is_absolute(path))
|
|
return -EINVAL;
|
|
|
|
s = strjoin(controller, ":", path, NULL);
|
|
if (!s)
|
|
return -ENOMEM;
|
|
|
|
path_kill_slashes(s + strlen(controller) + 1);
|
|
|
|
*spec = s;
|
|
return 0;
|
|
}
|
|
|
|
int cg_mangle_path(const char *path, char **result) {
|
|
_cleanup_free_ char *c = NULL, *p = NULL;
|
|
char *t;
|
|
int r;
|
|
|
|
assert(path);
|
|
assert(result);
|
|
|
|
/* First check if it already is a filesystem path */
|
|
if (path_startswith(path, "/sys/fs/cgroup")) {
|
|
|
|
t = strdup(path);
|
|
if (!t)
|
|
return -ENOMEM;
|
|
|
|
path_kill_slashes(t);
|
|
*result = t;
|
|
return 0;
|
|
}
|
|
|
|
/* Otherwise treat it as cg spec */
|
|
r = cg_split_spec(path, &c, &p);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
return cg_get_path(c ? c : SYSTEMD_CGROUP_CONTROLLER, p ? p : "/", NULL, result);
|
|
}
|
|
|
|
int cg_get_system_path(char **path) {
|
|
char *p;
|
|
int r;
|
|
|
|
assert(path);
|
|
|
|
r = cg_pid_get_path(SYSTEMD_CGROUP_CONTROLLER, 1, &p);
|
|
if (r < 0) {
|
|
p = strdup("/system");
|
|
if (!p)
|
|
return -ENOMEM;
|
|
}
|
|
|
|
if (endswith(p, "/system"))
|
|
*path = p;
|
|
else {
|
|
char *q;
|
|
|
|
q = strappend(p, "/system");
|
|
free(p);
|
|
if (!q)
|
|
return -ENOMEM;
|
|
|
|
*path = q;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
int cg_get_root_path(char **path) {
|
|
char *root, *e;
|
|
int r;
|
|
|
|
assert(path);
|
|
|
|
r = cg_pid_get_path(SYSTEMD_CGROUP_CONTROLLER, 1, &root);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
e = endswith(root, "/system");
|
|
if (e == root)
|
|
e[1] = 0;
|
|
else if (e)
|
|
*e = 0;
|
|
|
|
*path = root;
|
|
return 0;
|
|
}
|
|
|
|
int cg_get_user_path(char **path) {
|
|
_cleanup_free_ char *root = NULL;
|
|
char *p;
|
|
|
|
assert(path);
|
|
|
|
/* Figure out the place to put user cgroups below. We use the
|
|
* same as PID 1 has but with the "/system" suffix replaced by
|
|
* "/user" */
|
|
|
|
if (cg_get_root_path(&root) < 0 || streq(root, "/"))
|
|
p = strdup("/user");
|
|
else
|
|
p = strappend(root, "/user");
|
|
|
|
if (!p)
|
|
return -ENOMEM;
|
|
|
|
*path = p;
|
|
return 0;
|
|
}
|
|
|
|
int cg_get_machine_path(const char *machine, char **path) {
|
|
_cleanup_free_ char *root = NULL, *escaped = NULL;
|
|
char *p;
|
|
|
|
assert(path);
|
|
|
|
if (machine) {
|
|
const char *name = strappenda(machine, ".nspawn");
|
|
|
|
escaped = cg_escape(name);
|
|
if (!escaped)
|
|
return -ENOMEM;
|
|
}
|
|
|
|
p = strjoin(cg_get_root_path(&root) >= 0 && !streq(root, "/") ? root : "",
|
|
"/machine", machine ? "/" : "", machine ? escaped : "", NULL);
|
|
if (!p)
|
|
return -ENOMEM;
|
|
|
|
*path = p;
|
|
return 0;
|
|
}
|
|
|
|
char **cg_shorten_controllers(char **controllers) {
|
|
char **f, **t;
|
|
|
|
if (!controllers)
|
|
return controllers;
|
|
|
|
for (f = controllers, t = controllers; *f; f++) {
|
|
const char *p;
|
|
int r;
|
|
|
|
p = normalize_controller(*f);
|
|
|
|
if (streq(p, "systemd")) {
|
|
free(*f);
|
|
continue;
|
|
}
|
|
|
|
if (!cg_controller_is_valid(p, true)) {
|
|
log_warning("Controller %s is not valid, removing from controllers list.", p);
|
|
free(*f);
|
|
continue;
|
|
}
|
|
|
|
r = check_hierarchy(p);
|
|
if (r < 0) {
|
|
log_debug("Controller %s is not available, removing from controllers list.", p);
|
|
free(*f);
|
|
continue;
|
|
}
|
|
|
|
*(t++) = *f;
|
|
}
|
|
|
|
*t = NULL;
|
|
return strv_uniq(controllers);
|
|
}
|
|
|
|
int cg_pid_get_path_shifted(pid_t pid, char **root, char **cgroup) {
|
|
_cleanup_free_ char *cg_root = NULL;
|
|
char *cg_process, *p;
|
|
int r;
|
|
|
|
r = cg_get_root_path(&cg_root);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
r = cg_pid_get_path(SYSTEMD_CGROUP_CONTROLLER, pid, &cg_process);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
p = path_startswith(cg_process, cg_root);
|
|
if (p)
|
|
p--;
|
|
else
|
|
p = cg_process;
|
|
|
|
if (cgroup) {
|
|
char* c;
|
|
|
|
c = strdup(p);
|
|
if (!c) {
|
|
free(cg_process);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
*cgroup = c;
|
|
}
|
|
|
|
if (root) {
|
|
cg_process[p-cg_process] = 0;
|
|
*root = cg_process;
|
|
} else
|
|
free(cg_process);
|
|
|
|
return 0;
|
|
}
|
|
|
|
int cg_path_decode_unit(const char *cgroup, char **unit){
|
|
char *p, *e, *c, *s, *k;
|
|
|
|
assert(cgroup);
|
|
assert(unit);
|
|
|
|
e = strchrnul(cgroup, '/');
|
|
c = strndupa(cgroup, e - cgroup);
|
|
c = cg_unescape(c);
|
|
|
|
/* Could this be a valid unit name? */
|
|
if (!unit_name_is_valid(c, true))
|
|
return -EINVAL;
|
|
|
|
if (!unit_name_is_template(c))
|
|
s = strdup(c);
|
|
else {
|
|
if (*e != '/')
|
|
return -EINVAL;
|
|
|
|
e += strspn(e, "/");
|
|
|
|
p = strchrnul(e, '/');
|
|
k = strndupa(e, p - e);
|
|
k = cg_unescape(k);
|
|
|
|
if (!unit_name_is_valid(k, false))
|
|
return -EINVAL;
|
|
|
|
s = strdup(k);
|
|
}
|
|
|
|
if (!s)
|
|
return -ENOMEM;
|
|
|
|
*unit = s;
|
|
return 0;
|
|
}
|
|
|
|
int cg_path_get_unit(const char *path, char **unit) {
|
|
const char *e;
|
|
|
|
assert(path);
|
|
assert(unit);
|
|
|
|
e = path_startswith(path, "/system/");
|
|
if (!e)
|
|
return -ENOENT;
|
|
|
|
return cg_path_decode_unit(e, unit);
|
|
}
|
|
|
|
int cg_pid_get_unit(pid_t pid, char **unit) {
|
|
_cleanup_free_ char *cgroup = NULL;
|
|
int r;
|
|
|
|
assert(unit);
|
|
|
|
r = cg_pid_get_path_shifted(pid, NULL, &cgroup);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
return cg_path_get_unit(cgroup, unit);
|
|
}
|
|
|
|
_pure_ static const char *skip_label(const char *e) {
|
|
assert(e);
|
|
|
|
e = strchr(e, '/');
|
|
if (!e)
|
|
return NULL;
|
|
|
|
e += strspn(e, "/");
|
|
return e;
|
|
}
|
|
|
|
int cg_path_get_user_unit(const char *path, char **unit) {
|
|
const char *e;
|
|
|
|
assert(path);
|
|
assert(unit);
|
|
|
|
/* We always have to parse the path from the beginning as unit
|
|
* cgroups might have arbitrary child cgroups and we shouldn't get
|
|
* confused by those */
|
|
|
|
e = path_startswith(path, "/user/");
|
|
if (!e)
|
|
return -ENOENT;
|
|
|
|
/* Skip the user name */
|
|
e = skip_label(e);
|
|
if (!e)
|
|
return -ENOENT;
|
|
|
|
/* Skip the session ID */
|
|
e = skip_label(e);
|
|
if (!e)
|
|
return -ENOENT;
|
|
|
|
/* Skip the systemd cgroup */
|
|
e = skip_label(e);
|
|
if (!e)
|
|
return -ENOENT;
|
|
|
|
return cg_path_decode_unit(e, unit);
|
|
}
|
|
|
|
int cg_pid_get_user_unit(pid_t pid, char **unit) {
|
|
_cleanup_free_ char *cgroup = NULL;
|
|
int r;
|
|
|
|
assert(unit);
|
|
|
|
r = cg_pid_get_path_shifted(pid, NULL, &cgroup);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
return cg_path_get_user_unit(cgroup, unit);
|
|
}
|
|
|
|
int cg_path_get_machine_name(const char *path, char **machine) {
|
|
const char *e, *n;
|
|
char *s, *r;
|
|
|
|
assert(path);
|
|
assert(machine);
|
|
|
|
e = path_startswith(path, "/machine/");
|
|
if (!e)
|
|
return -ENOENT;
|
|
|
|
n = strchrnul(e, '/');
|
|
if (e == n)
|
|
return -ENOENT;
|
|
|
|
s = strndupa(e, n - e);
|
|
|
|
r = strdup(cg_unescape(s));
|
|
if (!r)
|
|
return -ENOMEM;
|
|
|
|
*machine = r;
|
|
return 0;
|
|
}
|
|
|
|
int cg_pid_get_machine_name(pid_t pid, char **machine) {
|
|
_cleanup_free_ char *cgroup = NULL;
|
|
int r;
|
|
|
|
assert(machine);
|
|
|
|
r = cg_pid_get_path_shifted(pid, NULL, &cgroup);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
return cg_path_get_machine_name(cgroup, machine);
|
|
}
|
|
|
|
int cg_path_get_session(const char *path, char **session) {
|
|
const char *e, *n;
|
|
char *s;
|
|
|
|
assert(path);
|
|
assert(session);
|
|
|
|
e = path_startswith(path, "/user/");
|
|
if (!e)
|
|
return -ENOENT;
|
|
|
|
/* Skip the user name */
|
|
e = skip_label(e);
|
|
if (!e)
|
|
return -ENOENT;
|
|
|
|
n = strchrnul(e, '/');
|
|
if (n - e < 8)
|
|
return -ENOENT;
|
|
if (memcmp(n - 8, ".session", 8) != 0)
|
|
return -ENOENT;
|
|
|
|
s = strndup(e, n - e - 8);
|
|
if (!s)
|
|
return -ENOMEM;
|
|
|
|
*session = s;
|
|
return 0;
|
|
}
|
|
|
|
int cg_pid_get_session(pid_t pid, char **session) {
|
|
_cleanup_free_ char *cgroup = NULL;
|
|
int r;
|
|
|
|
assert(session);
|
|
|
|
r = cg_pid_get_path_shifted(pid, NULL, &cgroup);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
return cg_path_get_session(cgroup, session);
|
|
}
|
|
|
|
int cg_path_get_owner_uid(const char *path, uid_t *uid) {
|
|
const char *e, *n;
|
|
char *s;
|
|
|
|
assert(path);
|
|
assert(uid);
|
|
|
|
e = path_startswith(path, "/user/");
|
|
if (!e)
|
|
return -ENOENT;
|
|
|
|
n = strchrnul(e, '/');
|
|
if (n - e < 5)
|
|
return -ENOENT;
|
|
if (memcmp(n - 5, ".user", 5) != 0)
|
|
return -ENOENT;
|
|
|
|
s = strndupa(e, n - e - 5);
|
|
if (!s)
|
|
return -ENOMEM;
|
|
|
|
return parse_uid(s, uid);
|
|
}
|
|
|
|
int cg_pid_get_owner_uid(pid_t pid, uid_t *uid) {
|
|
_cleanup_free_ char *cgroup = NULL;
|
|
int r;
|
|
|
|
assert(uid);
|
|
|
|
r = cg_pid_get_path_shifted(pid, NULL, &cgroup);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
return cg_path_get_owner_uid(cgroup, uid);
|
|
}
|
|
|
|
int cg_controller_from_attr(const char *attr, char **controller) {
|
|
const char *dot;
|
|
char *c;
|
|
|
|
assert(attr);
|
|
assert(controller);
|
|
|
|
if (!filename_is_safe(attr))
|
|
return -EINVAL;
|
|
|
|
dot = strchr(attr, '.');
|
|
if (!dot) {
|
|
*controller = NULL;
|
|
return 0;
|
|
}
|
|
|
|
c = strndup(attr, dot - attr);
|
|
if (!c)
|
|
return -ENOMEM;
|
|
|
|
if (!cg_controller_is_valid(c, false)) {
|
|
free(c);
|
|
return -EINVAL;
|
|
}
|
|
|
|
*controller = c;
|
|
return 1;
|
|
}
|
|
|
|
char *cg_escape(const char *p) {
|
|
bool need_prefix = false;
|
|
|
|
/* This implements very minimal escaping for names to be used
|
|
* as file names in the cgroup tree: any name which might
|
|
* conflict with a kernel name or is prefixed with '_' is
|
|
* prefixed with a '_'. That way, when reading cgroup names it
|
|
* is sufficient to remove a single prefixing underscore if
|
|
* there is one. */
|
|
|
|
/* The return value of this function (unlike cg_unescape())
|
|
* needs free()! */
|
|
|
|
if (p[0] == 0 ||
|
|
p[0] == '_' ||
|
|
p[0] == '.' ||
|
|
streq(p, "notify_on_release") ||
|
|
streq(p, "release_agent") ||
|
|
streq(p, "tasks"))
|
|
need_prefix = true;
|
|
else {
|
|
const char *dot;
|
|
|
|
dot = strrchr(p, '.');
|
|
if (dot) {
|
|
|
|
if (dot - p == 6 && memcmp(p, "cgroup", 6) == 0)
|
|
need_prefix = true;
|
|
else {
|
|
char *n;
|
|
|
|
n = strndupa(p, dot - p);
|
|
|
|
if (check_hierarchy(n) >= 0)
|
|
need_prefix = true;
|
|
}
|
|
}
|
|
}
|
|
|
|
if (need_prefix)
|
|
return strappend("_", p);
|
|
else
|
|
return strdup(p);
|
|
}
|
|
|
|
char *cg_unescape(const char *p) {
|
|
assert(p);
|
|
|
|
/* The return value of this function (unlike cg_escape())
|
|
* doesn't need free()! */
|
|
|
|
if (p[0] == '_')
|
|
return (char*) p+1;
|
|
|
|
return (char*) p;
|
|
}
|
|
|
|
#define CONTROLLER_VALID \
|
|
"0123456789" \
|
|
"abcdefghijklmnopqrstuvwxyz" \
|
|
"ABCDEFGHIJKLMNOPQRSTUVWXYZ" \
|
|
"_"
|
|
|
|
bool cg_controller_is_valid(const char *p, bool allow_named) {
|
|
const char *t, *s;
|
|
|
|
if (!p)
|
|
return false;
|
|
|
|
if (allow_named) {
|
|
s = startswith(p, "name=");
|
|
if (s)
|
|
p = s;
|
|
}
|
|
|
|
if (*p == 0 || *p == '_')
|
|
return false;
|
|
|
|
for (t = p; *t; t++)
|
|
if (!strchr(CONTROLLER_VALID, *t))
|
|
return false;
|
|
|
|
if (t - p > FILENAME_MAX)
|
|
return false;
|
|
|
|
return true;
|
|
}
|
|
|
|
int cg_slice_to_path(const char *unit, char **ret) {
|
|
_cleanup_free_ char *p = NULL, *s = NULL, *e = NULL;
|
|
const char *dash;
|
|
|
|
assert(unit);
|
|
assert(ret);
|
|
|
|
if (!unit_name_is_valid(unit, false))
|
|
return -EINVAL;
|
|
|
|
if (!endswith(unit, ".slice"))
|
|
return -EINVAL;
|
|
|
|
p = unit_name_to_prefix(unit);
|
|
if (!p)
|
|
return -ENOMEM;
|
|
|
|
dash = strchr(p, '-');
|
|
while (dash) {
|
|
_cleanup_free_ char *escaped = NULL;
|
|
char n[dash - p + sizeof(".slice")];
|
|
|
|
strcpy(stpncpy(n, p, dash - p), ".slice");
|
|
|
|
if (!unit_name_is_valid(n, false))
|
|
return -EINVAL;
|
|
|
|
escaped = cg_escape(n);
|
|
if (!escaped)
|
|
return -ENOMEM;
|
|
|
|
if (!strextend(&s, escaped, "/", NULL))
|
|
return -ENOMEM;
|
|
|
|
dash = strchr(dash+1, '-');
|
|
}
|
|
|
|
e = cg_escape(unit);
|
|
if (!e)
|
|
return -ENOMEM;
|
|
|
|
if (!strextend(&s, e, NULL))
|
|
return -ENOMEM;
|
|
|
|
*ret = s;
|
|
s = NULL;
|
|
|
|
return 0;
|
|
}
|