2894 lines
78 KiB
C
2894 lines
78 KiB
C
/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
|
||
|
||
/***
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||
This file is part of systemd.
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||
|
||
Copyright 2010 Lennart Poettering
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||
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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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||
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||
systemd is distributed in the hope that it will be useful, but
|
||
WITHOUT ANY WARRANTY; without even the implied warranty of
|
||
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
||
Lesser General Public License for more details.
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||
|
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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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||
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#include <ctype.h>
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||
#include <dirent.h>
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||
#include <errno.h>
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||
#include <fcntl.h>
|
||
#include <glob.h>
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||
#include <grp.h>
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||
#include <langinfo.h>
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||
#include <libintl.h>
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||
#include <limits.h>
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||
#include <linux/magic.h>
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||
#include <linux/oom.h>
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||
#include <linux/sched.h>
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||
#include <locale.h>
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||
#include <poll.h>
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||
#include <pwd.h>
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||
#include <sched.h>
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||
#include <signal.h>
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||
#include <stdarg.h>
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||
#include <stdio.h>
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||
#include <stdlib.h>
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||
#include <string.h>
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||
#include <sys/file.h>
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||
#include <sys/ioctl.h>
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||
#include <sys/mman.h>
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||
#include <sys/mount.h>
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||
#include <sys/personality.h>
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||
#include <sys/prctl.h>
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||
#include <sys/resource.h>
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||
#include <sys/stat.h>
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||
#include <sys/statvfs.h>
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||
#include <sys/time.h>
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||
#include <sys/types.h>
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||
#include <sys/utsname.h>
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||
#include <sys/vfs.h>
|
||
#include <sys/wait.h>
|
||
#include <sys/xattr.h>
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||
#include <syslog.h>
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||
#include <unistd.h>
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||
|
||
/* When we include libgen.h because we need dirname() we immediately
|
||
* undefine basename() since libgen.h defines it as a macro to the
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||
* POSIX version which is really broken. We prefer GNU basename(). */
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#include <libgen.h>
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||
#undef basename
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||
|
||
#ifdef HAVE_SYS_AUXV_H
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||
#include <sys/auxv.h>
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||
#endif
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||
|
||
/* We include linux/fs.h as last of the system headers, as it
|
||
* otherwise conflicts with sys/mount.h. Yay, Linux is great! */
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||
#include <linux/fs.h>
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||
|
||
#include "build.h"
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||
#include "def.h"
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||
#include "device-nodes.h"
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||
#include "env-util.h"
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||
#include "escape.h"
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||
#include "exit-status.h"
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||
#include "fd-util.h"
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||
#include "fileio.h"
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||
#include "formats-util.h"
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||
#include "gunicode.h"
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||
#include "hashmap.h"
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||
#include "hostname-util.h"
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||
#include "ioprio.h"
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||
#include "log.h"
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||
#include "macro.h"
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||
#include "missing.h"
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||
#include "mkdir.h"
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||
#include "hexdecoct.h"
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||
#include "parse-util.h"
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||
#include "path-util.h"
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||
#include "process-util.h"
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||
#include "random-util.h"
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||
#include "signal-util.h"
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||
#include "sparse-endian.h"
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||
#include "string-util.h"
|
||
#include "strv.h"
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||
#include "terminal-util.h"
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||
#include "user-util.h"
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||
#include "utf8.h"
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||
#include "util.h"
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||
#include "virt.h"
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||
|
||
/* Put this test here for a lack of better place */
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||
assert_cc(EAGAIN == EWOULDBLOCK);
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||
|
||
int saved_argc = 0;
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||
char **saved_argv = NULL;
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||
|
||
size_t page_size(void) {
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static thread_local size_t pgsz = 0;
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||
long r;
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||
|
||
if (_likely_(pgsz > 0))
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return pgsz;
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||
|
||
r = sysconf(_SC_PAGESIZE);
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||
assert(r > 0);
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||
|
||
pgsz = (size_t) r;
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||
return pgsz;
|
||
}
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||
|
||
int unlink_noerrno(const char *path) {
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||
PROTECT_ERRNO;
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||
int r;
|
||
|
||
r = unlink(path);
|
||
if (r < 0)
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||
return -errno;
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||
|
||
return 0;
|
||
}
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||
|
||
int fchmod_umask(int fd, mode_t m) {
|
||
mode_t u;
|
||
int r;
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||
|
||
u = umask(0777);
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||
r = fchmod(fd, m & (~u)) < 0 ? -errno : 0;
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||
umask(u);
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||
|
||
return r;
|
||
}
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||
|
||
int readlinkat_malloc(int fd, const char *p, char **ret) {
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||
size_t l = 100;
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||
int r;
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||
|
||
assert(p);
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||
assert(ret);
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||
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||
for (;;) {
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||
char *c;
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||
ssize_t n;
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||
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||
c = new(char, l);
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||
if (!c)
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return -ENOMEM;
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||
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||
n = readlinkat(fd, p, c, l-1);
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||
if (n < 0) {
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||
r = -errno;
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||
free(c);
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||
return r;
|
||
}
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||
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||
if ((size_t) n < l-1) {
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||
c[n] = 0;
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||
*ret = c;
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||
return 0;
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||
}
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||
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||
free(c);
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||
l *= 2;
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||
}
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||
}
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int readlink_malloc(const char *p, char **ret) {
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return readlinkat_malloc(AT_FDCWD, p, ret);
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||
}
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||
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||
int readlink_value(const char *p, char **ret) {
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||
_cleanup_free_ char *link = NULL;
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||
char *value;
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||
int r;
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||
|
||
r = readlink_malloc(p, &link);
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||
if (r < 0)
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return r;
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value = basename(link);
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||
if (!value)
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||
return -ENOENT;
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||
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||
value = strdup(value);
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||
if (!value)
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||
return -ENOMEM;
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||
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||
*ret = value;
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||
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||
return 0;
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||
}
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||
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||
int readlink_and_make_absolute(const char *p, char **r) {
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||
_cleanup_free_ char *target = NULL;
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||
char *k;
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||
int j;
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||
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||
assert(p);
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||
assert(r);
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||
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||
j = readlink_malloc(p, &target);
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||
if (j < 0)
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||
return j;
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||
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||
k = file_in_same_dir(p, target);
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||
if (!k)
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return -ENOMEM;
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||
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*r = k;
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||
return 0;
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||
}
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||
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||
int readlink_and_canonicalize(const char *p, char **r) {
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||
char *t, *s;
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||
int j;
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||
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||
assert(p);
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||
assert(r);
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||
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||
j = readlink_and_make_absolute(p, &t);
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||
if (j < 0)
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||
return j;
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||
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||
s = canonicalize_file_name(t);
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||
if (s) {
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||
free(t);
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*r = s;
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||
} else
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*r = t;
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path_kill_slashes(*r);
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||
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||
return 0;
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||
}
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||
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||
char *file_in_same_dir(const char *path, const char *filename) {
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char *e, *ret;
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||
size_t k;
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||
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||
assert(path);
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||
assert(filename);
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||
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||
/* This removes the last component of path and appends
|
||
* filename, unless the latter is absolute anyway or the
|
||
* former isn't */
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||
if (path_is_absolute(filename))
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return strdup(filename);
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||
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e = strrchr(path, '/');
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||
if (!e)
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||
return strdup(filename);
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||
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||
k = strlen(filename);
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||
ret = new(char, (e + 1 - path) + k + 1);
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||
if (!ret)
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||
return NULL;
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||
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||
memcpy(mempcpy(ret, path, e + 1 - path), filename, k + 1);
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||
return ret;
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||
}
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||
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int rmdir_parents(const char *path, const char *stop) {
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||
size_t l;
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||
int r = 0;
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||
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||
assert(path);
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||
assert(stop);
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l = strlen(path);
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||
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||
/* Skip trailing slashes */
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||
while (l > 0 && path[l-1] == '/')
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l--;
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||
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||
while (l > 0) {
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||
char *t;
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||
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||
/* Skip last component */
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||
while (l > 0 && path[l-1] != '/')
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||
l--;
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||
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||
/* Skip trailing slashes */
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||
while (l > 0 && path[l-1] == '/')
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||
l--;
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||
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||
if (l <= 0)
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||
break;
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||
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||
if (!(t = strndup(path, l)))
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||
return -ENOMEM;
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||
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||
if (path_startswith(stop, t)) {
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||
free(t);
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||
return 0;
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||
}
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||
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||
r = rmdir(t);
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||
free(t);
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||
|
||
if (r < 0)
|
||
if (errno != ENOENT)
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||
return -errno;
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||
}
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||
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||
return 0;
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||
}
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||
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||
_pure_ static bool hidden_file_allow_backup(const char *filename) {
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||
assert(filename);
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||
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||
return
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filename[0] == '.' ||
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||
streq(filename, "lost+found") ||
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streq(filename, "aquota.user") ||
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||
streq(filename, "aquota.group") ||
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||
endswith(filename, ".rpmnew") ||
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endswith(filename, ".rpmsave") ||
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||
endswith(filename, ".rpmorig") ||
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||
endswith(filename, ".dpkg-old") ||
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||
endswith(filename, ".dpkg-new") ||
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||
endswith(filename, ".dpkg-tmp") ||
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||
endswith(filename, ".dpkg-dist") ||
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||
endswith(filename, ".dpkg-bak") ||
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||
endswith(filename, ".dpkg-backup") ||
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||
endswith(filename, ".dpkg-remove") ||
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endswith(filename, ".swp");
|
||
}
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||
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||
bool hidden_file(const char *filename) {
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||
assert(filename);
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||
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||
if (endswith(filename, "~"))
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return true;
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|
||
return hidden_file_allow_backup(filename);
|
||
}
|
||
|
||
bool fstype_is_network(const char *fstype) {
|
||
static const char table[] =
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||
"afs\0"
|
||
"cifs\0"
|
||
"smbfs\0"
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||
"sshfs\0"
|
||
"ncpfs\0"
|
||
"ncp\0"
|
||
"nfs\0"
|
||
"nfs4\0"
|
||
"gfs\0"
|
||
"gfs2\0"
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||
"glusterfs\0";
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||
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const char *x;
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||
|
||
x = startswith(fstype, "fuse.");
|
||
if (x)
|
||
fstype = x;
|
||
|
||
return nulstr_contains(table, fstype);
|
||
}
|
||
|
||
bool is_device_path(const char *path) {
|
||
|
||
/* Returns true on paths that refer to a device, either in
|
||
* sysfs or in /dev */
|
||
|
||
return
|
||
path_startswith(path, "/dev/") ||
|
||
path_startswith(path, "/sys/");
|
||
}
|
||
|
||
int dir_is_empty(const char *path) {
|
||
_cleanup_closedir_ DIR *d;
|
||
struct dirent *de;
|
||
|
||
d = opendir(path);
|
||
if (!d)
|
||
return -errno;
|
||
|
||
FOREACH_DIRENT(de, d, return -errno)
|
||
return 0;
|
||
|
||
return 1;
|
||
}
|
||
|
||
void rename_process(const char name[8]) {
|
||
assert(name);
|
||
|
||
/* This is a like a poor man's setproctitle(). It changes the
|
||
* comm field, argv[0], and also the glibc's internally used
|
||
* name of the process. For the first one a limit of 16 chars
|
||
* applies, to the second one usually one of 10 (i.e. length
|
||
* of "/sbin/init"), to the third one one of 7 (i.e. length of
|
||
* "systemd"). If you pass a longer string it will be
|
||
* truncated */
|
||
|
||
prctl(PR_SET_NAME, name);
|
||
|
||
if (program_invocation_name)
|
||
strncpy(program_invocation_name, name, strlen(program_invocation_name));
|
||
|
||
if (saved_argc > 0) {
|
||
int i;
|
||
|
||
if (saved_argv[0])
|
||
strncpy(saved_argv[0], name, strlen(saved_argv[0]));
|
||
|
||
for (i = 1; i < saved_argc; i++) {
|
||
if (!saved_argv[i])
|
||
break;
|
||
|
||
memzero(saved_argv[i], strlen(saved_argv[i]));
|
||
}
|
||
}
|
||
}
|
||
|
||
bool is_fs_type(const struct statfs *s, statfs_f_type_t magic_value) {
|
||
assert(s);
|
||
assert_cc(sizeof(statfs_f_type_t) >= sizeof(s->f_type));
|
||
|
||
return F_TYPE_EQUAL(s->f_type, magic_value);
|
||
}
|
||
|
||
int fd_check_fstype(int fd, statfs_f_type_t magic_value) {
|
||
struct statfs s;
|
||
|
||
if (fstatfs(fd, &s) < 0)
|
||
return -errno;
|
||
|
||
return is_fs_type(&s, magic_value);
|
||
}
|
||
|
||
int path_check_fstype(const char *path, statfs_f_type_t magic_value) {
|
||
_cleanup_close_ int fd = -1;
|
||
|
||
fd = open(path, O_RDONLY);
|
||
if (fd < 0)
|
||
return -errno;
|
||
|
||
return fd_check_fstype(fd, magic_value);
|
||
}
|
||
|
||
bool is_temporary_fs(const struct statfs *s) {
|
||
return is_fs_type(s, TMPFS_MAGIC) ||
|
||
is_fs_type(s, RAMFS_MAGIC);
|
||
}
|
||
|
||
int fd_is_temporary_fs(int fd) {
|
||
struct statfs s;
|
||
|
||
if (fstatfs(fd, &s) < 0)
|
||
return -errno;
|
||
|
||
return is_temporary_fs(&s);
|
||
}
|
||
|
||
int chmod_and_chown(const char *path, mode_t mode, uid_t uid, gid_t gid) {
|
||
assert(path);
|
||
|
||
/* Under the assumption that we are running privileged we
|
||
* first change the access mode and only then hand out
|
||
* ownership to avoid a window where access is too open. */
|
||
|
||
if (mode != MODE_INVALID)
|
||
if (chmod(path, mode) < 0)
|
||
return -errno;
|
||
|
||
if (uid != UID_INVALID || gid != GID_INVALID)
|
||
if (chown(path, uid, gid) < 0)
|
||
return -errno;
|
||
|
||
return 0;
|
||
}
|
||
|
||
int fchmod_and_fchown(int fd, mode_t mode, uid_t uid, gid_t gid) {
|
||
assert(fd >= 0);
|
||
|
||
/* Under the assumption that we are running privileged we
|
||
* first change the access mode and only then hand out
|
||
* ownership to avoid a window where access is too open. */
|
||
|
||
if (mode != MODE_INVALID)
|
||
if (fchmod(fd, mode) < 0)
|
||
return -errno;
|
||
|
||
if (uid != UID_INVALID || gid != GID_INVALID)
|
||
if (fchown(fd, uid, gid) < 0)
|
||
return -errno;
|
||
|
||
return 0;
|
||
}
|
||
|
||
int files_same(const char *filea, const char *fileb) {
|
||
struct stat a, b;
|
||
|
||
if (stat(filea, &a) < 0)
|
||
return -errno;
|
||
|
||
if (stat(fileb, &b) < 0)
|
||
return -errno;
|
||
|
||
return a.st_dev == b.st_dev &&
|
||
a.st_ino == b.st_ino;
|
||
}
|
||
|
||
int running_in_chroot(void) {
|
||
int ret;
|
||
|
||
ret = files_same("/proc/1/root", "/");
|
||
if (ret < 0)
|
||
return ret;
|
||
|
||
return ret == 0;
|
||
}
|
||
|
||
int touch_file(const char *path, bool parents, usec_t stamp, uid_t uid, gid_t gid, mode_t mode) {
|
||
_cleanup_close_ int fd;
|
||
int r;
|
||
|
||
assert(path);
|
||
|
||
if (parents)
|
||
mkdir_parents(path, 0755);
|
||
|
||
fd = open(path, O_WRONLY|O_CREAT|O_CLOEXEC|O_NOCTTY, mode > 0 ? mode : 0644);
|
||
if (fd < 0)
|
||
return -errno;
|
||
|
||
if (mode > 0) {
|
||
r = fchmod(fd, mode);
|
||
if (r < 0)
|
||
return -errno;
|
||
}
|
||
|
||
if (uid != UID_INVALID || gid != GID_INVALID) {
|
||
r = fchown(fd, uid, gid);
|
||
if (r < 0)
|
||
return -errno;
|
||
}
|
||
|
||
if (stamp != USEC_INFINITY) {
|
||
struct timespec ts[2];
|
||
|
||
timespec_store(&ts[0], stamp);
|
||
ts[1] = ts[0];
|
||
r = futimens(fd, ts);
|
||
} else
|
||
r = futimens(fd, NULL);
|
||
if (r < 0)
|
||
return -errno;
|
||
|
||
return 0;
|
||
}
|
||
|
||
int touch(const char *path) {
|
||
return touch_file(path, false, USEC_INFINITY, UID_INVALID, GID_INVALID, 0);
|
||
}
|
||
|
||
static char *unquote(const char *s, const char* quotes) {
|
||
size_t l;
|
||
assert(s);
|
||
|
||
/* This is rather stupid, simply removes the heading and
|
||
* trailing quotes if there is one. Doesn't care about
|
||
* escaping or anything.
|
||
*
|
||
* DON'T USE THIS FOR NEW CODE ANYMORE!*/
|
||
|
||
l = strlen(s);
|
||
if (l < 2)
|
||
return strdup(s);
|
||
|
||
if (strchr(quotes, s[0]) && s[l-1] == s[0])
|
||
return strndup(s+1, l-2);
|
||
|
||
return strdup(s);
|
||
}
|
||
|
||
noreturn void freeze(void) {
|
||
|
||
/* Make sure nobody waits for us on a socket anymore */
|
||
close_all_fds(NULL, 0);
|
||
|
||
sync();
|
||
|
||
for (;;)
|
||
pause();
|
||
}
|
||
|
||
bool null_or_empty(struct stat *st) {
|
||
assert(st);
|
||
|
||
if (S_ISREG(st->st_mode) && st->st_size <= 0)
|
||
return true;
|
||
|
||
if (S_ISCHR(st->st_mode) || S_ISBLK(st->st_mode))
|
||
return true;
|
||
|
||
return false;
|
||
}
|
||
|
||
int null_or_empty_path(const char *fn) {
|
||
struct stat st;
|
||
|
||
assert(fn);
|
||
|
||
if (stat(fn, &st) < 0)
|
||
return -errno;
|
||
|
||
return null_or_empty(&st);
|
||
}
|
||
|
||
int null_or_empty_fd(int fd) {
|
||
struct stat st;
|
||
|
||
assert(fd >= 0);
|
||
|
||
if (fstat(fd, &st) < 0)
|
||
return -errno;
|
||
|
||
return null_or_empty(&st);
|
||
}
|
||
|
||
static char *tag_to_udev_node(const char *tagvalue, const char *by) {
|
||
_cleanup_free_ char *t = NULL, *u = NULL;
|
||
size_t enc_len;
|
||
|
||
u = unquote(tagvalue, QUOTES);
|
||
if (!u)
|
||
return NULL;
|
||
|
||
enc_len = strlen(u) * 4 + 1;
|
||
t = new(char, enc_len);
|
||
if (!t)
|
||
return NULL;
|
||
|
||
if (encode_devnode_name(u, t, enc_len) < 0)
|
||
return NULL;
|
||
|
||
return strjoin("/dev/disk/by-", by, "/", t, NULL);
|
||
}
|
||
|
||
char *fstab_node_to_udev_node(const char *p) {
|
||
assert(p);
|
||
|
||
if (startswith(p, "LABEL="))
|
||
return tag_to_udev_node(p+6, "label");
|
||
|
||
if (startswith(p, "UUID="))
|
||
return tag_to_udev_node(p+5, "uuid");
|
||
|
||
if (startswith(p, "PARTUUID="))
|
||
return tag_to_udev_node(p+9, "partuuid");
|
||
|
||
if (startswith(p, "PARTLABEL="))
|
||
return tag_to_udev_node(p+10, "partlabel");
|
||
|
||
return strdup(p);
|
||
}
|
||
|
||
bool dirent_is_file(const struct dirent *de) {
|
||
assert(de);
|
||
|
||
if (hidden_file(de->d_name))
|
||
return false;
|
||
|
||
if (de->d_type != DT_REG &&
|
||
de->d_type != DT_LNK &&
|
||
de->d_type != DT_UNKNOWN)
|
||
return false;
|
||
|
||
return true;
|
||
}
|
||
|
||
bool dirent_is_file_with_suffix(const struct dirent *de, const char *suffix) {
|
||
assert(de);
|
||
|
||
if (de->d_type != DT_REG &&
|
||
de->d_type != DT_LNK &&
|
||
de->d_type != DT_UNKNOWN)
|
||
return false;
|
||
|
||
if (hidden_file_allow_backup(de->d_name))
|
||
return false;
|
||
|
||
return endswith(de->d_name, suffix);
|
||
}
|
||
|
||
static int do_execute(char **directories, usec_t timeout, char *argv[]) {
|
||
_cleanup_hashmap_free_free_ Hashmap *pids = NULL;
|
||
_cleanup_set_free_free_ Set *seen = NULL;
|
||
char **directory;
|
||
|
||
/* We fork this all off from a child process so that we can
|
||
* somewhat cleanly make use of SIGALRM to set a time limit */
|
||
|
||
(void) reset_all_signal_handlers();
|
||
(void) reset_signal_mask();
|
||
|
||
assert_se(prctl(PR_SET_PDEATHSIG, SIGTERM) == 0);
|
||
|
||
pids = hashmap_new(NULL);
|
||
if (!pids)
|
||
return log_oom();
|
||
|
||
seen = set_new(&string_hash_ops);
|
||
if (!seen)
|
||
return log_oom();
|
||
|
||
STRV_FOREACH(directory, directories) {
|
||
_cleanup_closedir_ DIR *d;
|
||
struct dirent *de;
|
||
|
||
d = opendir(*directory);
|
||
if (!d) {
|
||
if (errno == ENOENT)
|
||
continue;
|
||
|
||
return log_error_errno(errno, "Failed to open directory %s: %m", *directory);
|
||
}
|
||
|
||
FOREACH_DIRENT(de, d, break) {
|
||
_cleanup_free_ char *path = NULL;
|
||
pid_t pid;
|
||
int r;
|
||
|
||
if (!dirent_is_file(de))
|
||
continue;
|
||
|
||
if (set_contains(seen, de->d_name)) {
|
||
log_debug("%1$s/%2$s skipped (%2$s was already seen).", *directory, de->d_name);
|
||
continue;
|
||
}
|
||
|
||
r = set_put_strdup(seen, de->d_name);
|
||
if (r < 0)
|
||
return log_oom();
|
||
|
||
path = strjoin(*directory, "/", de->d_name, NULL);
|
||
if (!path)
|
||
return log_oom();
|
||
|
||
if (null_or_empty_path(path)) {
|
||
log_debug("%s is empty (a mask).", path);
|
||
continue;
|
||
}
|
||
|
||
pid = fork();
|
||
if (pid < 0) {
|
||
log_error_errno(errno, "Failed to fork: %m");
|
||
continue;
|
||
} else if (pid == 0) {
|
||
char *_argv[2];
|
||
|
||
assert_se(prctl(PR_SET_PDEATHSIG, SIGTERM) == 0);
|
||
|
||
if (!argv) {
|
||
_argv[0] = path;
|
||
_argv[1] = NULL;
|
||
argv = _argv;
|
||
} else
|
||
argv[0] = path;
|
||
|
||
execv(path, argv);
|
||
return log_error_errno(errno, "Failed to execute %s: %m", path);
|
||
}
|
||
|
||
log_debug("Spawned %s as " PID_FMT ".", path, pid);
|
||
|
||
r = hashmap_put(pids, UINT_TO_PTR(pid), path);
|
||
if (r < 0)
|
||
return log_oom();
|
||
path = NULL;
|
||
}
|
||
}
|
||
|
||
/* Abort execution of this process after the timout. We simply
|
||
* rely on SIGALRM as default action terminating the process,
|
||
* and turn on alarm(). */
|
||
|
||
if (timeout != USEC_INFINITY)
|
||
alarm((timeout + USEC_PER_SEC - 1) / USEC_PER_SEC);
|
||
|
||
while (!hashmap_isempty(pids)) {
|
||
_cleanup_free_ char *path = NULL;
|
||
pid_t pid;
|
||
|
||
pid = PTR_TO_UINT(hashmap_first_key(pids));
|
||
assert(pid > 0);
|
||
|
||
path = hashmap_remove(pids, UINT_TO_PTR(pid));
|
||
assert(path);
|
||
|
||
wait_for_terminate_and_warn(path, pid, true);
|
||
}
|
||
|
||
return 0;
|
||
}
|
||
|
||
void execute_directories(const char* const* directories, usec_t timeout, char *argv[]) {
|
||
pid_t executor_pid;
|
||
int r;
|
||
char *name;
|
||
char **dirs = (char**) directories;
|
||
|
||
assert(!strv_isempty(dirs));
|
||
|
||
name = basename(dirs[0]);
|
||
assert(!isempty(name));
|
||
|
||
/* Executes all binaries in the directories in parallel and waits
|
||
* for them to finish. Optionally a timeout is applied. If a file
|
||
* with the same name exists in more than one directory, the
|
||
* earliest one wins. */
|
||
|
||
executor_pid = fork();
|
||
if (executor_pid < 0) {
|
||
log_error_errno(errno, "Failed to fork: %m");
|
||
return;
|
||
|
||
} else if (executor_pid == 0) {
|
||
r = do_execute(dirs, timeout, argv);
|
||
_exit(r < 0 ? EXIT_FAILURE : EXIT_SUCCESS);
|
||
}
|
||
|
||
wait_for_terminate_and_warn(name, executor_pid, true);
|
||
}
|
||
|
||
bool plymouth_running(void) {
|
||
return access("/run/plymouth/pid", F_OK) >= 0;
|
||
}
|
||
|
||
int symlink_atomic(const char *from, const char *to) {
|
||
_cleanup_free_ char *t = NULL;
|
||
int r;
|
||
|
||
assert(from);
|
||
assert(to);
|
||
|
||
r = tempfn_random(to, NULL, &t);
|
||
if (r < 0)
|
||
return r;
|
||
|
||
if (symlink(from, t) < 0)
|
||
return -errno;
|
||
|
||
if (rename(t, to) < 0) {
|
||
unlink_noerrno(t);
|
||
return -errno;
|
||
}
|
||
|
||
return 0;
|
||
}
|
||
|
||
int symlink_idempotent(const char *from, const char *to) {
|
||
_cleanup_free_ char *p = NULL;
|
||
int r;
|
||
|
||
assert(from);
|
||
assert(to);
|
||
|
||
if (symlink(from, to) < 0) {
|
||
if (errno != EEXIST)
|
||
return -errno;
|
||
|
||
r = readlink_malloc(to, &p);
|
||
if (r < 0)
|
||
return r;
|
||
|
||
if (!streq(p, from))
|
||
return -EINVAL;
|
||
}
|
||
|
||
return 0;
|
||
}
|
||
|
||
int mknod_atomic(const char *path, mode_t mode, dev_t dev) {
|
||
_cleanup_free_ char *t = NULL;
|
||
int r;
|
||
|
||
assert(path);
|
||
|
||
r = tempfn_random(path, NULL, &t);
|
||
if (r < 0)
|
||
return r;
|
||
|
||
if (mknod(t, mode, dev) < 0)
|
||
return -errno;
|
||
|
||
if (rename(t, path) < 0) {
|
||
unlink_noerrno(t);
|
||
return -errno;
|
||
}
|
||
|
||
return 0;
|
||
}
|
||
|
||
int mkfifo_atomic(const char *path, mode_t mode) {
|
||
_cleanup_free_ char *t = NULL;
|
||
int r;
|
||
|
||
assert(path);
|
||
|
||
r = tempfn_random(path, NULL, &t);
|
||
if (r < 0)
|
||
return r;
|
||
|
||
if (mkfifo(t, mode) < 0)
|
||
return -errno;
|
||
|
||
if (rename(t, path) < 0) {
|
||
unlink_noerrno(t);
|
||
return -errno;
|
||
}
|
||
|
||
return 0;
|
||
}
|
||
|
||
bool display_is_local(const char *display) {
|
||
assert(display);
|
||
|
||
return
|
||
display[0] == ':' &&
|
||
display[1] >= '0' &&
|
||
display[1] <= '9';
|
||
}
|
||
|
||
int socket_from_display(const char *display, char **path) {
|
||
size_t k;
|
||
char *f, *c;
|
||
|
||
assert(display);
|
||
assert(path);
|
||
|
||
if (!display_is_local(display))
|
||
return -EINVAL;
|
||
|
||
k = strspn(display+1, "0123456789");
|
||
|
||
f = new(char, strlen("/tmp/.X11-unix/X") + k + 1);
|
||
if (!f)
|
||
return -ENOMEM;
|
||
|
||
c = stpcpy(f, "/tmp/.X11-unix/X");
|
||
memcpy(c, display+1, k);
|
||
c[k] = 0;
|
||
|
||
*path = f;
|
||
|
||
return 0;
|
||
}
|
||
|
||
int glob_exists(const char *path) {
|
||
_cleanup_globfree_ glob_t g = {};
|
||
int k;
|
||
|
||
assert(path);
|
||
|
||
errno = 0;
|
||
k = glob(path, GLOB_NOSORT|GLOB_BRACE, NULL, &g);
|
||
|
||
if (k == GLOB_NOMATCH)
|
||
return 0;
|
||
else if (k == GLOB_NOSPACE)
|
||
return -ENOMEM;
|
||
else if (k == 0)
|
||
return !strv_isempty(g.gl_pathv);
|
||
else
|
||
return errno ? -errno : -EIO;
|
||
}
|
||
|
||
int glob_extend(char ***strv, const char *path) {
|
||
_cleanup_globfree_ glob_t g = {};
|
||
int k;
|
||
char **p;
|
||
|
||
errno = 0;
|
||
k = glob(path, GLOB_NOSORT|GLOB_BRACE, NULL, &g);
|
||
|
||
if (k == GLOB_NOMATCH)
|
||
return -ENOENT;
|
||
else if (k == GLOB_NOSPACE)
|
||
return -ENOMEM;
|
||
else if (k != 0 || strv_isempty(g.gl_pathv))
|
||
return errno ? -errno : -EIO;
|
||
|
||
STRV_FOREACH(p, g.gl_pathv) {
|
||
k = strv_extend(strv, *p);
|
||
if (k < 0)
|
||
break;
|
||
}
|
||
|
||
return k;
|
||
}
|
||
|
||
int dirent_ensure_type(DIR *d, struct dirent *de) {
|
||
struct stat st;
|
||
|
||
assert(d);
|
||
assert(de);
|
||
|
||
if (de->d_type != DT_UNKNOWN)
|
||
return 0;
|
||
|
||
if (fstatat(dirfd(d), de->d_name, &st, AT_SYMLINK_NOFOLLOW) < 0)
|
||
return -errno;
|
||
|
||
de->d_type =
|
||
S_ISREG(st.st_mode) ? DT_REG :
|
||
S_ISDIR(st.st_mode) ? DT_DIR :
|
||
S_ISLNK(st.st_mode) ? DT_LNK :
|
||
S_ISFIFO(st.st_mode) ? DT_FIFO :
|
||
S_ISSOCK(st.st_mode) ? DT_SOCK :
|
||
S_ISCHR(st.st_mode) ? DT_CHR :
|
||
S_ISBLK(st.st_mode) ? DT_BLK :
|
||
DT_UNKNOWN;
|
||
|
||
return 0;
|
||
}
|
||
|
||
int get_files_in_directory(const char *path, char ***list) {
|
||
_cleanup_closedir_ DIR *d = NULL;
|
||
size_t bufsize = 0, n = 0;
|
||
_cleanup_strv_free_ char **l = NULL;
|
||
|
||
assert(path);
|
||
|
||
/* Returns all files in a directory in *list, and the number
|
||
* of files as return value. If list is NULL returns only the
|
||
* number. */
|
||
|
||
d = opendir(path);
|
||
if (!d)
|
||
return -errno;
|
||
|
||
for (;;) {
|
||
struct dirent *de;
|
||
|
||
errno = 0;
|
||
de = readdir(d);
|
||
if (!de && errno != 0)
|
||
return -errno;
|
||
if (!de)
|
||
break;
|
||
|
||
dirent_ensure_type(d, de);
|
||
|
||
if (!dirent_is_file(de))
|
||
continue;
|
||
|
||
if (list) {
|
||
/* one extra slot is needed for the terminating NULL */
|
||
if (!GREEDY_REALLOC(l, bufsize, n + 2))
|
||
return -ENOMEM;
|
||
|
||
l[n] = strdup(de->d_name);
|
||
if (!l[n])
|
||
return -ENOMEM;
|
||
|
||
l[++n] = NULL;
|
||
} else
|
||
n++;
|
||
}
|
||
|
||
if (list) {
|
||
*list = l;
|
||
l = NULL; /* avoid freeing */
|
||
}
|
||
|
||
return n;
|
||
}
|
||
|
||
bool is_main_thread(void) {
|
||
static thread_local int cached = 0;
|
||
|
||
if (_unlikely_(cached == 0))
|
||
cached = getpid() == gettid() ? 1 : -1;
|
||
|
||
return cached > 0;
|
||
}
|
||
|
||
int block_get_whole_disk(dev_t d, dev_t *ret) {
|
||
char *p, *s;
|
||
int r;
|
||
unsigned n, m;
|
||
|
||
assert(ret);
|
||
|
||
/* If it has a queue this is good enough for us */
|
||
if (asprintf(&p, "/sys/dev/block/%u:%u/queue", major(d), minor(d)) < 0)
|
||
return -ENOMEM;
|
||
|
||
r = access(p, F_OK);
|
||
free(p);
|
||
|
||
if (r >= 0) {
|
||
*ret = d;
|
||
return 0;
|
||
}
|
||
|
||
/* If it is a partition find the originating device */
|
||
if (asprintf(&p, "/sys/dev/block/%u:%u/partition", major(d), minor(d)) < 0)
|
||
return -ENOMEM;
|
||
|
||
r = access(p, F_OK);
|
||
free(p);
|
||
|
||
if (r < 0)
|
||
return -ENOENT;
|
||
|
||
/* Get parent dev_t */
|
||
if (asprintf(&p, "/sys/dev/block/%u:%u/../dev", major(d), minor(d)) < 0)
|
||
return -ENOMEM;
|
||
|
||
r = read_one_line_file(p, &s);
|
||
free(p);
|
||
|
||
if (r < 0)
|
||
return r;
|
||
|
||
r = sscanf(s, "%u:%u", &m, &n);
|
||
free(s);
|
||
|
||
if (r != 2)
|
||
return -EINVAL;
|
||
|
||
/* Only return this if it is really good enough for us. */
|
||
if (asprintf(&p, "/sys/dev/block/%u:%u/queue", m, n) < 0)
|
||
return -ENOMEM;
|
||
|
||
r = access(p, F_OK);
|
||
free(p);
|
||
|
||
if (r >= 0) {
|
||
*ret = makedev(m, n);
|
||
return 0;
|
||
}
|
||
|
||
return -ENOENT;
|
||
}
|
||
|
||
static const char *const ioprio_class_table[] = {
|
||
[IOPRIO_CLASS_NONE] = "none",
|
||
[IOPRIO_CLASS_RT] = "realtime",
|
||
[IOPRIO_CLASS_BE] = "best-effort",
|
||
[IOPRIO_CLASS_IDLE] = "idle"
|
||
};
|
||
|
||
DEFINE_STRING_TABLE_LOOKUP_WITH_FALLBACK(ioprio_class, int, INT_MAX);
|
||
|
||
static const char *const sigchld_code_table[] = {
|
||
[CLD_EXITED] = "exited",
|
||
[CLD_KILLED] = "killed",
|
||
[CLD_DUMPED] = "dumped",
|
||
[CLD_TRAPPED] = "trapped",
|
||
[CLD_STOPPED] = "stopped",
|
||
[CLD_CONTINUED] = "continued",
|
||
};
|
||
|
||
DEFINE_STRING_TABLE_LOOKUP(sigchld_code, int);
|
||
|
||
static const char *const log_facility_unshifted_table[LOG_NFACILITIES] = {
|
||
[LOG_FAC(LOG_KERN)] = "kern",
|
||
[LOG_FAC(LOG_USER)] = "user",
|
||
[LOG_FAC(LOG_MAIL)] = "mail",
|
||
[LOG_FAC(LOG_DAEMON)] = "daemon",
|
||
[LOG_FAC(LOG_AUTH)] = "auth",
|
||
[LOG_FAC(LOG_SYSLOG)] = "syslog",
|
||
[LOG_FAC(LOG_LPR)] = "lpr",
|
||
[LOG_FAC(LOG_NEWS)] = "news",
|
||
[LOG_FAC(LOG_UUCP)] = "uucp",
|
||
[LOG_FAC(LOG_CRON)] = "cron",
|
||
[LOG_FAC(LOG_AUTHPRIV)] = "authpriv",
|
||
[LOG_FAC(LOG_FTP)] = "ftp",
|
||
[LOG_FAC(LOG_LOCAL0)] = "local0",
|
||
[LOG_FAC(LOG_LOCAL1)] = "local1",
|
||
[LOG_FAC(LOG_LOCAL2)] = "local2",
|
||
[LOG_FAC(LOG_LOCAL3)] = "local3",
|
||
[LOG_FAC(LOG_LOCAL4)] = "local4",
|
||
[LOG_FAC(LOG_LOCAL5)] = "local5",
|
||
[LOG_FAC(LOG_LOCAL6)] = "local6",
|
||
[LOG_FAC(LOG_LOCAL7)] = "local7"
|
||
};
|
||
|
||
DEFINE_STRING_TABLE_LOOKUP_WITH_FALLBACK(log_facility_unshifted, int, LOG_FAC(~0));
|
||
|
||
bool log_facility_unshifted_is_valid(int facility) {
|
||
return facility >= 0 && facility <= LOG_FAC(~0);
|
||
}
|
||
|
||
static const char *const log_level_table[] = {
|
||
[LOG_EMERG] = "emerg",
|
||
[LOG_ALERT] = "alert",
|
||
[LOG_CRIT] = "crit",
|
||
[LOG_ERR] = "err",
|
||
[LOG_WARNING] = "warning",
|
||
[LOG_NOTICE] = "notice",
|
||
[LOG_INFO] = "info",
|
||
[LOG_DEBUG] = "debug"
|
||
};
|
||
|
||
DEFINE_STRING_TABLE_LOOKUP_WITH_FALLBACK(log_level, int, LOG_DEBUG);
|
||
|
||
bool log_level_is_valid(int level) {
|
||
return level >= 0 && level <= LOG_DEBUG;
|
||
}
|
||
|
||
static const char* const sched_policy_table[] = {
|
||
[SCHED_OTHER] = "other",
|
||
[SCHED_BATCH] = "batch",
|
||
[SCHED_IDLE] = "idle",
|
||
[SCHED_FIFO] = "fifo",
|
||
[SCHED_RR] = "rr"
|
||
};
|
||
|
||
DEFINE_STRING_TABLE_LOOKUP_WITH_FALLBACK(sched_policy, int, INT_MAX);
|
||
|
||
static const char* const rlimit_table[_RLIMIT_MAX] = {
|
||
[RLIMIT_CPU] = "LimitCPU",
|
||
[RLIMIT_FSIZE] = "LimitFSIZE",
|
||
[RLIMIT_DATA] = "LimitDATA",
|
||
[RLIMIT_STACK] = "LimitSTACK",
|
||
[RLIMIT_CORE] = "LimitCORE",
|
||
[RLIMIT_RSS] = "LimitRSS",
|
||
[RLIMIT_NOFILE] = "LimitNOFILE",
|
||
[RLIMIT_AS] = "LimitAS",
|
||
[RLIMIT_NPROC] = "LimitNPROC",
|
||
[RLIMIT_MEMLOCK] = "LimitMEMLOCK",
|
||
[RLIMIT_LOCKS] = "LimitLOCKS",
|
||
[RLIMIT_SIGPENDING] = "LimitSIGPENDING",
|
||
[RLIMIT_MSGQUEUE] = "LimitMSGQUEUE",
|
||
[RLIMIT_NICE] = "LimitNICE",
|
||
[RLIMIT_RTPRIO] = "LimitRTPRIO",
|
||
[RLIMIT_RTTIME] = "LimitRTTIME"
|
||
};
|
||
|
||
DEFINE_STRING_TABLE_LOOKUP(rlimit, int);
|
||
|
||
bool kexec_loaded(void) {
|
||
bool loaded = false;
|
||
char *s;
|
||
|
||
if (read_one_line_file("/sys/kernel/kexec_loaded", &s) >= 0) {
|
||
if (s[0] == '1')
|
||
loaded = true;
|
||
free(s);
|
||
}
|
||
return loaded;
|
||
}
|
||
|
||
int prot_from_flags(int flags) {
|
||
|
||
switch (flags & O_ACCMODE) {
|
||
|
||
case O_RDONLY:
|
||
return PROT_READ;
|
||
|
||
case O_WRONLY:
|
||
return PROT_WRITE;
|
||
|
||
case O_RDWR:
|
||
return PROT_READ|PROT_WRITE;
|
||
|
||
default:
|
||
return -EINVAL;
|
||
}
|
||
}
|
||
|
||
void* memdup(const void *p, size_t l) {
|
||
void *r;
|
||
|
||
assert(p);
|
||
|
||
r = malloc(l);
|
||
if (!r)
|
||
return NULL;
|
||
|
||
memcpy(r, p, l);
|
||
return r;
|
||
}
|
||
|
||
int fork_agent(pid_t *pid, const int except[], unsigned n_except, const char *path, ...) {
|
||
bool stdout_is_tty, stderr_is_tty;
|
||
pid_t parent_pid, agent_pid;
|
||
sigset_t ss, saved_ss;
|
||
unsigned n, i;
|
||
va_list ap;
|
||
char **l;
|
||
|
||
assert(pid);
|
||
assert(path);
|
||
|
||
/* Spawns a temporary TTY agent, making sure it goes away when
|
||
* we go away */
|
||
|
||
parent_pid = getpid();
|
||
|
||
/* First we temporarily block all signals, so that the new
|
||
* child has them blocked initially. This way, we can be sure
|
||
* that SIGTERMs are not lost we might send to the agent. */
|
||
assert_se(sigfillset(&ss) >= 0);
|
||
assert_se(sigprocmask(SIG_SETMASK, &ss, &saved_ss) >= 0);
|
||
|
||
agent_pid = fork();
|
||
if (agent_pid < 0) {
|
||
assert_se(sigprocmask(SIG_SETMASK, &saved_ss, NULL) >= 0);
|
||
return -errno;
|
||
}
|
||
|
||
if (agent_pid != 0) {
|
||
assert_se(sigprocmask(SIG_SETMASK, &saved_ss, NULL) >= 0);
|
||
*pid = agent_pid;
|
||
return 0;
|
||
}
|
||
|
||
/* In the child:
|
||
*
|
||
* Make sure the agent goes away when the parent dies */
|
||
if (prctl(PR_SET_PDEATHSIG, SIGTERM) < 0)
|
||
_exit(EXIT_FAILURE);
|
||
|
||
/* Make sure we actually can kill the agent, if we need to, in
|
||
* case somebody invoked us from a shell script that trapped
|
||
* SIGTERM or so... */
|
||
(void) reset_all_signal_handlers();
|
||
(void) reset_signal_mask();
|
||
|
||
/* Check whether our parent died before we were able
|
||
* to set the death signal and unblock the signals */
|
||
if (getppid() != parent_pid)
|
||
_exit(EXIT_SUCCESS);
|
||
|
||
/* Don't leak fds to the agent */
|
||
close_all_fds(except, n_except);
|
||
|
||
stdout_is_tty = isatty(STDOUT_FILENO);
|
||
stderr_is_tty = isatty(STDERR_FILENO);
|
||
|
||
if (!stdout_is_tty || !stderr_is_tty) {
|
||
int fd;
|
||
|
||
/* Detach from stdout/stderr. and reopen
|
||
* /dev/tty for them. This is important to
|
||
* ensure that when systemctl is started via
|
||
* popen() or a similar call that expects to
|
||
* read EOF we actually do generate EOF and
|
||
* not delay this indefinitely by because we
|
||
* keep an unused copy of stdin around. */
|
||
fd = open("/dev/tty", O_WRONLY);
|
||
if (fd < 0) {
|
||
log_error_errno(errno, "Failed to open /dev/tty: %m");
|
||
_exit(EXIT_FAILURE);
|
||
}
|
||
|
||
if (!stdout_is_tty)
|
||
dup2(fd, STDOUT_FILENO);
|
||
|
||
if (!stderr_is_tty)
|
||
dup2(fd, STDERR_FILENO);
|
||
|
||
if (fd > 2)
|
||
close(fd);
|
||
}
|
||
|
||
/* Count arguments */
|
||
va_start(ap, path);
|
||
for (n = 0; va_arg(ap, char*); n++)
|
||
;
|
||
va_end(ap);
|
||
|
||
/* Allocate strv */
|
||
l = alloca(sizeof(char *) * (n + 1));
|
||
|
||
/* Fill in arguments */
|
||
va_start(ap, path);
|
||
for (i = 0; i <= n; i++)
|
||
l[i] = va_arg(ap, char*);
|
||
va_end(ap);
|
||
|
||
execv(path, l);
|
||
_exit(EXIT_FAILURE);
|
||
}
|
||
|
||
int setrlimit_closest(int resource, const struct rlimit *rlim) {
|
||
struct rlimit highest, fixed;
|
||
|
||
assert(rlim);
|
||
|
||
if (setrlimit(resource, rlim) >= 0)
|
||
return 0;
|
||
|
||
if (errno != EPERM)
|
||
return -errno;
|
||
|
||
/* So we failed to set the desired setrlimit, then let's try
|
||
* to get as close as we can */
|
||
assert_se(getrlimit(resource, &highest) == 0);
|
||
|
||
fixed.rlim_cur = MIN(rlim->rlim_cur, highest.rlim_max);
|
||
fixed.rlim_max = MIN(rlim->rlim_max, highest.rlim_max);
|
||
|
||
if (setrlimit(resource, &fixed) < 0)
|
||
return -errno;
|
||
|
||
return 0;
|
||
}
|
||
|
||
bool http_etag_is_valid(const char *etag) {
|
||
if (isempty(etag))
|
||
return false;
|
||
|
||
if (!endswith(etag, "\""))
|
||
return false;
|
||
|
||
if (!startswith(etag, "\"") && !startswith(etag, "W/\""))
|
||
return false;
|
||
|
||
return true;
|
||
}
|
||
|
||
bool http_url_is_valid(const char *url) {
|
||
const char *p;
|
||
|
||
if (isempty(url))
|
||
return false;
|
||
|
||
p = startswith(url, "http://");
|
||
if (!p)
|
||
p = startswith(url, "https://");
|
||
if (!p)
|
||
return false;
|
||
|
||
if (isempty(p))
|
||
return false;
|
||
|
||
return ascii_is_valid(p);
|
||
}
|
||
|
||
bool documentation_url_is_valid(const char *url) {
|
||
const char *p;
|
||
|
||
if (isempty(url))
|
||
return false;
|
||
|
||
if (http_url_is_valid(url))
|
||
return true;
|
||
|
||
p = startswith(url, "file:/");
|
||
if (!p)
|
||
p = startswith(url, "info:");
|
||
if (!p)
|
||
p = startswith(url, "man:");
|
||
|
||
if (isempty(p))
|
||
return false;
|
||
|
||
return ascii_is_valid(p);
|
||
}
|
||
|
||
bool in_initrd(void) {
|
||
static int saved = -1;
|
||
struct statfs s;
|
||
|
||
if (saved >= 0)
|
||
return saved;
|
||
|
||
/* We make two checks here:
|
||
*
|
||
* 1. the flag file /etc/initrd-release must exist
|
||
* 2. the root file system must be a memory file system
|
||
*
|
||
* The second check is extra paranoia, since misdetecting an
|
||
* initrd can have bad bad consequences due the initrd
|
||
* emptying when transititioning to the main systemd.
|
||
*/
|
||
|
||
saved = access("/etc/initrd-release", F_OK) >= 0 &&
|
||
statfs("/", &s) >= 0 &&
|
||
is_temporary_fs(&s);
|
||
|
||
return saved;
|
||
}
|
||
|
||
bool filename_is_valid(const char *p) {
|
||
|
||
if (isempty(p))
|
||
return false;
|
||
|
||
if (strchr(p, '/'))
|
||
return false;
|
||
|
||
if (streq(p, "."))
|
||
return false;
|
||
|
||
if (streq(p, ".."))
|
||
return false;
|
||
|
||
if (strlen(p) > FILENAME_MAX)
|
||
return false;
|
||
|
||
return true;
|
||
}
|
||
|
||
bool string_is_safe(const char *p) {
|
||
const char *t;
|
||
|
||
if (!p)
|
||
return false;
|
||
|
||
for (t = p; *t; t++) {
|
||
if (*t > 0 && *t < ' ')
|
||
return false;
|
||
|
||
if (strchr("\\\"\'\x7f", *t))
|
||
return false;
|
||
}
|
||
|
||
return true;
|
||
}
|
||
|
||
bool path_is_safe(const char *p) {
|
||
|
||
if (isempty(p))
|
||
return false;
|
||
|
||
if (streq(p, "..") || startswith(p, "../") || endswith(p, "/..") || strstr(p, "/../"))
|
||
return false;
|
||
|
||
if (strlen(p)+1 > PATH_MAX)
|
||
return false;
|
||
|
||
/* The following two checks are not really dangerous, but hey, they still are confusing */
|
||
if (streq(p, ".") || startswith(p, "./") || endswith(p, "/.") || strstr(p, "/./"))
|
||
return false;
|
||
|
||
if (strstr(p, "//"))
|
||
return false;
|
||
|
||
return true;
|
||
}
|
||
|
||
/* hey glibc, APIs with callbacks without a user pointer are so useless */
|
||
void *xbsearch_r(const void *key, const void *base, size_t nmemb, size_t size,
|
||
int (*compar) (const void *, const void *, void *), void *arg) {
|
||
size_t l, u, idx;
|
||
const void *p;
|
||
int comparison;
|
||
|
||
l = 0;
|
||
u = nmemb;
|
||
while (l < u) {
|
||
idx = (l + u) / 2;
|
||
p = (void *)(((const char *) base) + (idx * size));
|
||
comparison = compar(key, p, arg);
|
||
if (comparison < 0)
|
||
u = idx;
|
||
else if (comparison > 0)
|
||
l = idx + 1;
|
||
else
|
||
return (void *)p;
|
||
}
|
||
return NULL;
|
||
}
|
||
|
||
void init_gettext(void) {
|
||
setlocale(LC_ALL, "");
|
||
textdomain(GETTEXT_PACKAGE);
|
||
}
|
||
|
||
bool is_locale_utf8(void) {
|
||
const char *set;
|
||
static int cached_answer = -1;
|
||
|
||
if (cached_answer >= 0)
|
||
goto out;
|
||
|
||
if (!setlocale(LC_ALL, "")) {
|
||
cached_answer = true;
|
||
goto out;
|
||
}
|
||
|
||
set = nl_langinfo(CODESET);
|
||
if (!set) {
|
||
cached_answer = true;
|
||
goto out;
|
||
}
|
||
|
||
if (streq(set, "UTF-8")) {
|
||
cached_answer = true;
|
||
goto out;
|
||
}
|
||
|
||
/* For LC_CTYPE=="C" return true, because CTYPE is effectly
|
||
* unset and everything can do to UTF-8 nowadays. */
|
||
set = setlocale(LC_CTYPE, NULL);
|
||
if (!set) {
|
||
cached_answer = true;
|
||
goto out;
|
||
}
|
||
|
||
/* Check result, but ignore the result if C was set
|
||
* explicitly. */
|
||
cached_answer =
|
||
STR_IN_SET(set, "C", "POSIX") &&
|
||
!getenv("LC_ALL") &&
|
||
!getenv("LC_CTYPE") &&
|
||
!getenv("LANG");
|
||
|
||
out:
|
||
return (bool) cached_answer;
|
||
}
|
||
|
||
const char *draw_special_char(DrawSpecialChar ch) {
|
||
static const char *draw_table[2][_DRAW_SPECIAL_CHAR_MAX] = {
|
||
|
||
/* UTF-8 */ {
|
||
[DRAW_TREE_VERTICAL] = "\342\224\202 ", /* │ */
|
||
[DRAW_TREE_BRANCH] = "\342\224\234\342\224\200", /* ├─ */
|
||
[DRAW_TREE_RIGHT] = "\342\224\224\342\224\200", /* └─ */
|
||
[DRAW_TREE_SPACE] = " ", /* */
|
||
[DRAW_TRIANGULAR_BULLET] = "\342\200\243", /* ‣ */
|
||
[DRAW_BLACK_CIRCLE] = "\342\227\217", /* ● */
|
||
[DRAW_ARROW] = "\342\206\222", /* → */
|
||
[DRAW_DASH] = "\342\200\223", /* – */
|
||
},
|
||
|
||
/* ASCII fallback */ {
|
||
[DRAW_TREE_VERTICAL] = "| ",
|
||
[DRAW_TREE_BRANCH] = "|-",
|
||
[DRAW_TREE_RIGHT] = "`-",
|
||
[DRAW_TREE_SPACE] = " ",
|
||
[DRAW_TRIANGULAR_BULLET] = ">",
|
||
[DRAW_BLACK_CIRCLE] = "*",
|
||
[DRAW_ARROW] = "->",
|
||
[DRAW_DASH] = "-",
|
||
}
|
||
};
|
||
|
||
return draw_table[!is_locale_utf8()][ch];
|
||
}
|
||
|
||
int on_ac_power(void) {
|
||
bool found_offline = false, found_online = false;
|
||
_cleanup_closedir_ DIR *d = NULL;
|
||
|
||
d = opendir("/sys/class/power_supply");
|
||
if (!d)
|
||
return errno == ENOENT ? true : -errno;
|
||
|
||
for (;;) {
|
||
struct dirent *de;
|
||
_cleanup_close_ int fd = -1, device = -1;
|
||
char contents[6];
|
||
ssize_t n;
|
||
|
||
errno = 0;
|
||
de = readdir(d);
|
||
if (!de && errno != 0)
|
||
return -errno;
|
||
|
||
if (!de)
|
||
break;
|
||
|
||
if (hidden_file(de->d_name))
|
||
continue;
|
||
|
||
device = openat(dirfd(d), de->d_name, O_DIRECTORY|O_RDONLY|O_CLOEXEC|O_NOCTTY);
|
||
if (device < 0) {
|
||
if (errno == ENOENT || errno == ENOTDIR)
|
||
continue;
|
||
|
||
return -errno;
|
||
}
|
||
|
||
fd = openat(device, "type", O_RDONLY|O_CLOEXEC|O_NOCTTY);
|
||
if (fd < 0) {
|
||
if (errno == ENOENT)
|
||
continue;
|
||
|
||
return -errno;
|
||
}
|
||
|
||
n = read(fd, contents, sizeof(contents));
|
||
if (n < 0)
|
||
return -errno;
|
||
|
||
if (n != 6 || memcmp(contents, "Mains\n", 6))
|
||
continue;
|
||
|
||
safe_close(fd);
|
||
fd = openat(device, "online", O_RDONLY|O_CLOEXEC|O_NOCTTY);
|
||
if (fd < 0) {
|
||
if (errno == ENOENT)
|
||
continue;
|
||
|
||
return -errno;
|
||
}
|
||
|
||
n = read(fd, contents, sizeof(contents));
|
||
if (n < 0)
|
||
return -errno;
|
||
|
||
if (n != 2 || contents[1] != '\n')
|
||
return -EIO;
|
||
|
||
if (contents[0] == '1') {
|
||
found_online = true;
|
||
break;
|
||
} else if (contents[0] == '0')
|
||
found_offline = true;
|
||
else
|
||
return -EIO;
|
||
}
|
||
|
||
return found_online || !found_offline;
|
||
}
|
||
|
||
void* greedy_realloc(void **p, size_t *allocated, size_t need, size_t size) {
|
||
size_t a, newalloc;
|
||
void *q;
|
||
|
||
assert(p);
|
||
assert(allocated);
|
||
|
||
if (*allocated >= need)
|
||
return *p;
|
||
|
||
newalloc = MAX(need * 2, 64u / size);
|
||
a = newalloc * size;
|
||
|
||
/* check for overflows */
|
||
if (a < size * need)
|
||
return NULL;
|
||
|
||
q = realloc(*p, a);
|
||
if (!q)
|
||
return NULL;
|
||
|
||
*p = q;
|
||
*allocated = newalloc;
|
||
return q;
|
||
}
|
||
|
||
void* greedy_realloc0(void **p, size_t *allocated, size_t need, size_t size) {
|
||
size_t prev;
|
||
uint8_t *q;
|
||
|
||
assert(p);
|
||
assert(allocated);
|
||
|
||
prev = *allocated;
|
||
|
||
q = greedy_realloc(p, allocated, need, size);
|
||
if (!q)
|
||
return NULL;
|
||
|
||
if (*allocated > prev)
|
||
memzero(q + prev * size, (*allocated - prev) * size);
|
||
|
||
return q;
|
||
}
|
||
|
||
bool id128_is_valid(const char *s) {
|
||
size_t i, l;
|
||
|
||
l = strlen(s);
|
||
if (l == 32) {
|
||
|
||
/* Simple formatted 128bit hex string */
|
||
|
||
for (i = 0; i < l; i++) {
|
||
char c = s[i];
|
||
|
||
if (!(c >= '0' && c <= '9') &&
|
||
!(c >= 'a' && c <= 'z') &&
|
||
!(c >= 'A' && c <= 'Z'))
|
||
return false;
|
||
}
|
||
|
||
} else if (l == 36) {
|
||
|
||
/* Formatted UUID */
|
||
|
||
for (i = 0; i < l; i++) {
|
||
char c = s[i];
|
||
|
||
if ((i == 8 || i == 13 || i == 18 || i == 23)) {
|
||
if (c != '-')
|
||
return false;
|
||
} else {
|
||
if (!(c >= '0' && c <= '9') &&
|
||
!(c >= 'a' && c <= 'z') &&
|
||
!(c >= 'A' && c <= 'Z'))
|
||
return false;
|
||
}
|
||
}
|
||
|
||
} else
|
||
return false;
|
||
|
||
return true;
|
||
}
|
||
|
||
int shall_restore_state(void) {
|
||
_cleanup_free_ char *value = NULL;
|
||
int r;
|
||
|
||
r = get_proc_cmdline_key("systemd.restore_state=", &value);
|
||
if (r < 0)
|
||
return r;
|
||
if (r == 0)
|
||
return true;
|
||
|
||
return parse_boolean(value) != 0;
|
||
}
|
||
|
||
int proc_cmdline(char **ret) {
|
||
assert(ret);
|
||
|
||
if (detect_container() > 0)
|
||
return get_process_cmdline(1, 0, false, ret);
|
||
else
|
||
return read_one_line_file("/proc/cmdline", ret);
|
||
}
|
||
|
||
int parse_proc_cmdline(int (*parse_item)(const char *key, const char *value)) {
|
||
_cleanup_free_ char *line = NULL;
|
||
const char *p;
|
||
int r;
|
||
|
||
assert(parse_item);
|
||
|
||
r = proc_cmdline(&line);
|
||
if (r < 0)
|
||
return r;
|
||
|
||
p = line;
|
||
for (;;) {
|
||
_cleanup_free_ char *word = NULL;
|
||
char *value = NULL;
|
||
|
||
r = extract_first_word(&p, &word, NULL, EXTRACT_QUOTES|EXTRACT_RELAX);
|
||
if (r < 0)
|
||
return r;
|
||
if (r == 0)
|
||
break;
|
||
|
||
/* Filter out arguments that are intended only for the
|
||
* initrd */
|
||
if (!in_initrd() && startswith(word, "rd."))
|
||
continue;
|
||
|
||
value = strchr(word, '=');
|
||
if (value)
|
||
*(value++) = 0;
|
||
|
||
r = parse_item(word, value);
|
||
if (r < 0)
|
||
return r;
|
||
}
|
||
|
||
return 0;
|
||
}
|
||
|
||
int get_proc_cmdline_key(const char *key, char **value) {
|
||
_cleanup_free_ char *line = NULL, *ret = NULL;
|
||
bool found = false;
|
||
const char *p;
|
||
int r;
|
||
|
||
assert(key);
|
||
|
||
r = proc_cmdline(&line);
|
||
if (r < 0)
|
||
return r;
|
||
|
||
p = line;
|
||
for (;;) {
|
||
_cleanup_free_ char *word = NULL;
|
||
const char *e;
|
||
|
||
r = extract_first_word(&p, &word, NULL, EXTRACT_QUOTES|EXTRACT_RELAX);
|
||
if (r < 0)
|
||
return r;
|
||
if (r == 0)
|
||
break;
|
||
|
||
/* Filter out arguments that are intended only for the
|
||
* initrd */
|
||
if (!in_initrd() && startswith(word, "rd."))
|
||
continue;
|
||
|
||
if (value) {
|
||
e = startswith(word, key);
|
||
if (!e)
|
||
continue;
|
||
|
||
r = free_and_strdup(&ret, e);
|
||
if (r < 0)
|
||
return r;
|
||
|
||
found = true;
|
||
} else {
|
||
if (streq(word, key))
|
||
found = true;
|
||
}
|
||
}
|
||
|
||
if (value) {
|
||
*value = ret;
|
||
ret = NULL;
|
||
}
|
||
|
||
return found;
|
||
|
||
}
|
||
|
||
int container_get_leader(const char *machine, pid_t *pid) {
|
||
_cleanup_free_ char *s = NULL, *class = NULL;
|
||
const char *p;
|
||
pid_t leader;
|
||
int r;
|
||
|
||
assert(machine);
|
||
assert(pid);
|
||
|
||
if (!machine_name_is_valid(machine))
|
||
return -EINVAL;
|
||
|
||
p = strjoina("/run/systemd/machines/", machine);
|
||
r = parse_env_file(p, NEWLINE, "LEADER", &s, "CLASS", &class, NULL);
|
||
if (r == -ENOENT)
|
||
return -EHOSTDOWN;
|
||
if (r < 0)
|
||
return r;
|
||
if (!s)
|
||
return -EIO;
|
||
|
||
if (!streq_ptr(class, "container"))
|
||
return -EIO;
|
||
|
||
r = parse_pid(s, &leader);
|
||
if (r < 0)
|
||
return r;
|
||
if (leader <= 1)
|
||
return -EIO;
|
||
|
||
*pid = leader;
|
||
return 0;
|
||
}
|
||
|
||
int namespace_open(pid_t pid, int *pidns_fd, int *mntns_fd, int *netns_fd, int *userns_fd, int *root_fd) {
|
||
_cleanup_close_ int pidnsfd = -1, mntnsfd = -1, netnsfd = -1, usernsfd = -1;
|
||
int rfd = -1;
|
||
|
||
assert(pid >= 0);
|
||
|
||
if (mntns_fd) {
|
||
const char *mntns;
|
||
|
||
mntns = procfs_file_alloca(pid, "ns/mnt");
|
||
mntnsfd = open(mntns, O_RDONLY|O_NOCTTY|O_CLOEXEC);
|
||
if (mntnsfd < 0)
|
||
return -errno;
|
||
}
|
||
|
||
if (pidns_fd) {
|
||
const char *pidns;
|
||
|
||
pidns = procfs_file_alloca(pid, "ns/pid");
|
||
pidnsfd = open(pidns, O_RDONLY|O_NOCTTY|O_CLOEXEC);
|
||
if (pidnsfd < 0)
|
||
return -errno;
|
||
}
|
||
|
||
if (netns_fd) {
|
||
const char *netns;
|
||
|
||
netns = procfs_file_alloca(pid, "ns/net");
|
||
netnsfd = open(netns, O_RDONLY|O_NOCTTY|O_CLOEXEC);
|
||
if (netnsfd < 0)
|
||
return -errno;
|
||
}
|
||
|
||
if (userns_fd) {
|
||
const char *userns;
|
||
|
||
userns = procfs_file_alloca(pid, "ns/user");
|
||
usernsfd = open(userns, O_RDONLY|O_NOCTTY|O_CLOEXEC);
|
||
if (usernsfd < 0 && errno != ENOENT)
|
||
return -errno;
|
||
}
|
||
|
||
if (root_fd) {
|
||
const char *root;
|
||
|
||
root = procfs_file_alloca(pid, "root");
|
||
rfd = open(root, O_RDONLY|O_NOCTTY|O_CLOEXEC|O_DIRECTORY);
|
||
if (rfd < 0)
|
||
return -errno;
|
||
}
|
||
|
||
if (pidns_fd)
|
||
*pidns_fd = pidnsfd;
|
||
|
||
if (mntns_fd)
|
||
*mntns_fd = mntnsfd;
|
||
|
||
if (netns_fd)
|
||
*netns_fd = netnsfd;
|
||
|
||
if (userns_fd)
|
||
*userns_fd = usernsfd;
|
||
|
||
if (root_fd)
|
||
*root_fd = rfd;
|
||
|
||
pidnsfd = mntnsfd = netnsfd = usernsfd = -1;
|
||
|
||
return 0;
|
||
}
|
||
|
||
int namespace_enter(int pidns_fd, int mntns_fd, int netns_fd, int userns_fd, int root_fd) {
|
||
if (userns_fd >= 0) {
|
||
/* Can't setns to your own userns, since then you could
|
||
* escalate from non-root to root in your own namespace, so
|
||
* check if namespaces equal before attempting to enter. */
|
||
_cleanup_free_ char *userns_fd_path = NULL;
|
||
int r;
|
||
if (asprintf(&userns_fd_path, "/proc/self/fd/%d", userns_fd) < 0)
|
||
return -ENOMEM;
|
||
|
||
r = files_same(userns_fd_path, "/proc/self/ns/user");
|
||
if (r < 0)
|
||
return r;
|
||
if (r)
|
||
userns_fd = -1;
|
||
}
|
||
|
||
if (pidns_fd >= 0)
|
||
if (setns(pidns_fd, CLONE_NEWPID) < 0)
|
||
return -errno;
|
||
|
||
if (mntns_fd >= 0)
|
||
if (setns(mntns_fd, CLONE_NEWNS) < 0)
|
||
return -errno;
|
||
|
||
if (netns_fd >= 0)
|
||
if (setns(netns_fd, CLONE_NEWNET) < 0)
|
||
return -errno;
|
||
|
||
if (userns_fd >= 0)
|
||
if (setns(userns_fd, CLONE_NEWUSER) < 0)
|
||
return -errno;
|
||
|
||
if (root_fd >= 0) {
|
||
if (fchdir(root_fd) < 0)
|
||
return -errno;
|
||
|
||
if (chroot(".") < 0)
|
||
return -errno;
|
||
}
|
||
|
||
return reset_uid_gid();
|
||
}
|
||
|
||
int fd_warn_permissions(const char *path, int fd) {
|
||
struct stat st;
|
||
|
||
if (fstat(fd, &st) < 0)
|
||
return -errno;
|
||
|
||
if (st.st_mode & 0111)
|
||
log_warning("Configuration file %s is marked executable. Please remove executable permission bits. Proceeding anyway.", path);
|
||
|
||
if (st.st_mode & 0002)
|
||
log_warning("Configuration file %s is marked world-writable. Please remove world writability permission bits. Proceeding anyway.", path);
|
||
|
||
if (getpid() == 1 && (st.st_mode & 0044) != 0044)
|
||
log_warning("Configuration file %s is marked world-inaccessible. This has no effect as configuration data is accessible via APIs without restrictions. Proceeding anyway.", path);
|
||
|
||
return 0;
|
||
}
|
||
|
||
unsigned long personality_from_string(const char *p) {
|
||
|
||
/* Parse a personality specifier. We introduce our own
|
||
* identifiers that indicate specific ABIs, rather than just
|
||
* hints regarding the register size, since we want to keep
|
||
* things open for multiple locally supported ABIs for the
|
||
* same register size. We try to reuse the ABI identifiers
|
||
* used by libseccomp. */
|
||
|
||
#if defined(__x86_64__)
|
||
|
||
if (streq(p, "x86"))
|
||
return PER_LINUX32;
|
||
|
||
if (streq(p, "x86-64"))
|
||
return PER_LINUX;
|
||
|
||
#elif defined(__i386__)
|
||
|
||
if (streq(p, "x86"))
|
||
return PER_LINUX;
|
||
|
||
#elif defined(__s390x__)
|
||
|
||
if (streq(p, "s390"))
|
||
return PER_LINUX32;
|
||
|
||
if (streq(p, "s390x"))
|
||
return PER_LINUX;
|
||
|
||
#elif defined(__s390__)
|
||
|
||
if (streq(p, "s390"))
|
||
return PER_LINUX;
|
||
#endif
|
||
|
||
return PERSONALITY_INVALID;
|
||
}
|
||
|
||
const char* personality_to_string(unsigned long p) {
|
||
|
||
#if defined(__x86_64__)
|
||
|
||
if (p == PER_LINUX32)
|
||
return "x86";
|
||
|
||
if (p == PER_LINUX)
|
||
return "x86-64";
|
||
|
||
#elif defined(__i386__)
|
||
|
||
if (p == PER_LINUX)
|
||
return "x86";
|
||
|
||
#elif defined(__s390x__)
|
||
|
||
if (p == PER_LINUX)
|
||
return "s390x";
|
||
|
||
if (p == PER_LINUX32)
|
||
return "s390";
|
||
|
||
#elif defined(__s390__)
|
||
|
||
if (p == PER_LINUX)
|
||
return "s390";
|
||
|
||
#endif
|
||
|
||
return NULL;
|
||
}
|
||
|
||
uint64_t physical_memory(void) {
|
||
long mem;
|
||
|
||
/* We return this as uint64_t in case we are running as 32bit
|
||
* process on a 64bit kernel with huge amounts of memory */
|
||
|
||
mem = sysconf(_SC_PHYS_PAGES);
|
||
assert(mem > 0);
|
||
|
||
return (uint64_t) mem * (uint64_t) page_size();
|
||
}
|
||
|
||
int update_reboot_param_file(const char *param) {
|
||
int r = 0;
|
||
|
||
if (param) {
|
||
r = write_string_file(REBOOT_PARAM_FILE, param, WRITE_STRING_FILE_CREATE);
|
||
if (r < 0)
|
||
return log_error_errno(r, "Failed to write reboot param to "REBOOT_PARAM_FILE": %m");
|
||
} else
|
||
(void) unlink(REBOOT_PARAM_FILE);
|
||
|
||
return 0;
|
||
}
|
||
|
||
int umount_recursive(const char *prefix, int flags) {
|
||
bool again;
|
||
int n = 0, r;
|
||
|
||
/* Try to umount everything recursively below a
|
||
* directory. Also, take care of stacked mounts, and keep
|
||
* unmounting them until they are gone. */
|
||
|
||
do {
|
||
_cleanup_fclose_ FILE *proc_self_mountinfo = NULL;
|
||
|
||
again = false;
|
||
r = 0;
|
||
|
||
proc_self_mountinfo = fopen("/proc/self/mountinfo", "re");
|
||
if (!proc_self_mountinfo)
|
||
return -errno;
|
||
|
||
for (;;) {
|
||
_cleanup_free_ char *path = NULL, *p = NULL;
|
||
int k;
|
||
|
||
k = fscanf(proc_self_mountinfo,
|
||
"%*s " /* (1) mount id */
|
||
"%*s " /* (2) parent id */
|
||
"%*s " /* (3) major:minor */
|
||
"%*s " /* (4) root */
|
||
"%ms " /* (5) mount point */
|
||
"%*s" /* (6) mount options */
|
||
"%*[^-]" /* (7) optional fields */
|
||
"- " /* (8) separator */
|
||
"%*s " /* (9) file system type */
|
||
"%*s" /* (10) mount source */
|
||
"%*s" /* (11) mount options 2 */
|
||
"%*[^\n]", /* some rubbish at the end */
|
||
&path);
|
||
if (k != 1) {
|
||
if (k == EOF)
|
||
break;
|
||
|
||
continue;
|
||
}
|
||
|
||
r = cunescape(path, UNESCAPE_RELAX, &p);
|
||
if (r < 0)
|
||
return r;
|
||
|
||
if (!path_startswith(p, prefix))
|
||
continue;
|
||
|
||
if (umount2(p, flags) < 0) {
|
||
r = -errno;
|
||
continue;
|
||
}
|
||
|
||
again = true;
|
||
n++;
|
||
|
||
break;
|
||
}
|
||
|
||
} while (again);
|
||
|
||
return r ? r : n;
|
||
}
|
||
|
||
static int get_mount_flags(const char *path, unsigned long *flags) {
|
||
struct statvfs buf;
|
||
|
||
if (statvfs(path, &buf) < 0)
|
||
return -errno;
|
||
*flags = buf.f_flag;
|
||
return 0;
|
||
}
|
||
|
||
int bind_remount_recursive(const char *prefix, bool ro) {
|
||
_cleanup_set_free_free_ Set *done = NULL;
|
||
_cleanup_free_ char *cleaned = NULL;
|
||
int r;
|
||
|
||
/* Recursively remount a directory (and all its submounts)
|
||
* read-only or read-write. If the directory is already
|
||
* mounted, we reuse the mount and simply mark it
|
||
* MS_BIND|MS_RDONLY (or remove the MS_RDONLY for read-write
|
||
* operation). If it isn't we first make it one. Afterwards we
|
||
* apply MS_BIND|MS_RDONLY (or remove MS_RDONLY) to all
|
||
* submounts we can access, too. When mounts are stacked on
|
||
* the same mount point we only care for each individual
|
||
* "top-level" mount on each point, as we cannot
|
||
* influence/access the underlying mounts anyway. We do not
|
||
* have any effect on future submounts that might get
|
||
* propagated, they migt be writable. This includes future
|
||
* submounts that have been triggered via autofs. */
|
||
|
||
cleaned = strdup(prefix);
|
||
if (!cleaned)
|
||
return -ENOMEM;
|
||
|
||
path_kill_slashes(cleaned);
|
||
|
||
done = set_new(&string_hash_ops);
|
||
if (!done)
|
||
return -ENOMEM;
|
||
|
||
for (;;) {
|
||
_cleanup_fclose_ FILE *proc_self_mountinfo = NULL;
|
||
_cleanup_set_free_free_ Set *todo = NULL;
|
||
bool top_autofs = false;
|
||
char *x;
|
||
unsigned long orig_flags;
|
||
|
||
todo = set_new(&string_hash_ops);
|
||
if (!todo)
|
||
return -ENOMEM;
|
||
|
||
proc_self_mountinfo = fopen("/proc/self/mountinfo", "re");
|
||
if (!proc_self_mountinfo)
|
||
return -errno;
|
||
|
||
for (;;) {
|
||
_cleanup_free_ char *path = NULL, *p = NULL, *type = NULL;
|
||
int k;
|
||
|
||
k = fscanf(proc_self_mountinfo,
|
||
"%*s " /* (1) mount id */
|
||
"%*s " /* (2) parent id */
|
||
"%*s " /* (3) major:minor */
|
||
"%*s " /* (4) root */
|
||
"%ms " /* (5) mount point */
|
||
"%*s" /* (6) mount options (superblock) */
|
||
"%*[^-]" /* (7) optional fields */
|
||
"- " /* (8) separator */
|
||
"%ms " /* (9) file system type */
|
||
"%*s" /* (10) mount source */
|
||
"%*s" /* (11) mount options (bind mount) */
|
||
"%*[^\n]", /* some rubbish at the end */
|
||
&path,
|
||
&type);
|
||
if (k != 2) {
|
||
if (k == EOF)
|
||
break;
|
||
|
||
continue;
|
||
}
|
||
|
||
r = cunescape(path, UNESCAPE_RELAX, &p);
|
||
if (r < 0)
|
||
return r;
|
||
|
||
/* Let's ignore autofs mounts. If they aren't
|
||
* triggered yet, we want to avoid triggering
|
||
* them, as we don't make any guarantees for
|
||
* future submounts anyway. If they are
|
||
* already triggered, then we will find
|
||
* another entry for this. */
|
||
if (streq(type, "autofs")) {
|
||
top_autofs = top_autofs || path_equal(cleaned, p);
|
||
continue;
|
||
}
|
||
|
||
if (path_startswith(p, cleaned) &&
|
||
!set_contains(done, p)) {
|
||
|
||
r = set_consume(todo, p);
|
||
p = NULL;
|
||
|
||
if (r == -EEXIST)
|
||
continue;
|
||
if (r < 0)
|
||
return r;
|
||
}
|
||
}
|
||
|
||
/* If we have no submounts to process anymore and if
|
||
* the root is either already done, or an autofs, we
|
||
* are done */
|
||
if (set_isempty(todo) &&
|
||
(top_autofs || set_contains(done, cleaned)))
|
||
return 0;
|
||
|
||
if (!set_contains(done, cleaned) &&
|
||
!set_contains(todo, cleaned)) {
|
||
/* The prefix directory itself is not yet a
|
||
* mount, make it one. */
|
||
if (mount(cleaned, cleaned, NULL, MS_BIND|MS_REC, NULL) < 0)
|
||
return -errno;
|
||
|
||
orig_flags = 0;
|
||
(void) get_mount_flags(cleaned, &orig_flags);
|
||
orig_flags &= ~MS_RDONLY;
|
||
|
||
if (mount(NULL, prefix, NULL, orig_flags|MS_BIND|MS_REMOUNT|(ro ? MS_RDONLY : 0), NULL) < 0)
|
||
return -errno;
|
||
|
||
x = strdup(cleaned);
|
||
if (!x)
|
||
return -ENOMEM;
|
||
|
||
r = set_consume(done, x);
|
||
if (r < 0)
|
||
return r;
|
||
}
|
||
|
||
while ((x = set_steal_first(todo))) {
|
||
|
||
r = set_consume(done, x);
|
||
if (r == -EEXIST || r == 0)
|
||
continue;
|
||
if (r < 0)
|
||
return r;
|
||
|
||
/* Try to reuse the original flag set, but
|
||
* don't care for errors, in case of
|
||
* obstructed mounts */
|
||
orig_flags = 0;
|
||
(void) get_mount_flags(x, &orig_flags);
|
||
orig_flags &= ~MS_RDONLY;
|
||
|
||
if (mount(NULL, x, NULL, orig_flags|MS_BIND|MS_REMOUNT|(ro ? MS_RDONLY : 0), NULL) < 0) {
|
||
|
||
/* Deal with mount points that are
|
||
* obstructed by a later mount */
|
||
|
||
if (errno != ENOENT)
|
||
return -errno;
|
||
}
|
||
|
||
}
|
||
}
|
||
}
|
||
|
||
int take_password_lock(const char *root) {
|
||
|
||
struct flock flock = {
|
||
.l_type = F_WRLCK,
|
||
.l_whence = SEEK_SET,
|
||
.l_start = 0,
|
||
.l_len = 0,
|
||
};
|
||
|
||
const char *path;
|
||
int fd, r;
|
||
|
||
/* This is roughly the same as lckpwdf(), but not as awful. We
|
||
* don't want to use alarm() and signals, hence we implement
|
||
* our own trivial version of this.
|
||
*
|
||
* Note that shadow-utils also takes per-database locks in
|
||
* addition to lckpwdf(). However, we don't given that they
|
||
* are redundant as they they invoke lckpwdf() first and keep
|
||
* it during everything they do. The per-database locks are
|
||
* awfully racy, and thus we just won't do them. */
|
||
|
||
if (root)
|
||
path = strjoina(root, "/etc/.pwd.lock");
|
||
else
|
||
path = "/etc/.pwd.lock";
|
||
|
||
fd = open(path, O_WRONLY|O_CREAT|O_CLOEXEC|O_NOCTTY|O_NOFOLLOW, 0600);
|
||
if (fd < 0)
|
||
return -errno;
|
||
|
||
r = fcntl(fd, F_SETLKW, &flock);
|
||
if (r < 0) {
|
||
safe_close(fd);
|
||
return -errno;
|
||
}
|
||
|
||
return fd;
|
||
}
|
||
|
||
int is_symlink(const char *path) {
|
||
struct stat info;
|
||
|
||
if (lstat(path, &info) < 0)
|
||
return -errno;
|
||
|
||
return !!S_ISLNK(info.st_mode);
|
||
}
|
||
|
||
int is_dir(const char* path, bool follow) {
|
||
struct stat st;
|
||
int r;
|
||
|
||
if (follow)
|
||
r = stat(path, &st);
|
||
else
|
||
r = lstat(path, &st);
|
||
if (r < 0)
|
||
return -errno;
|
||
|
||
return !!S_ISDIR(st.st_mode);
|
||
}
|
||
|
||
int is_device_node(const char *path) {
|
||
struct stat info;
|
||
|
||
if (lstat(path, &info) < 0)
|
||
return -errno;
|
||
|
||
return !!(S_ISBLK(info.st_mode) || S_ISCHR(info.st_mode));
|
||
}
|
||
|
||
ssize_t fgetxattrat_fake(int dirfd, const char *filename, const char *attribute, void *value, size_t size, int flags) {
|
||
char fn[strlen("/proc/self/fd/") + DECIMAL_STR_MAX(int) + 1];
|
||
_cleanup_close_ int fd = -1;
|
||
ssize_t l;
|
||
|
||
/* The kernel doesn't have a fgetxattrat() command, hence let's emulate one */
|
||
|
||
fd = openat(dirfd, filename, O_RDONLY|O_CLOEXEC|O_NOCTTY|O_PATH|(flags & AT_SYMLINK_NOFOLLOW ? O_NOFOLLOW : 0));
|
||
if (fd < 0)
|
||
return -errno;
|
||
|
||
xsprintf(fn, "/proc/self/fd/%i", fd);
|
||
|
||
l = getxattr(fn, attribute, value, size);
|
||
if (l < 0)
|
||
return -errno;
|
||
|
||
return l;
|
||
}
|
||
|
||
static int parse_crtime(le64_t le, usec_t *usec) {
|
||
uint64_t u;
|
||
|
||
assert(usec);
|
||
|
||
u = le64toh(le);
|
||
if (u == 0 || u == (uint64_t) -1)
|
||
return -EIO;
|
||
|
||
*usec = (usec_t) u;
|
||
return 0;
|
||
}
|
||
|
||
int fd_getcrtime(int fd, usec_t *usec) {
|
||
le64_t le;
|
||
ssize_t n;
|
||
|
||
assert(fd >= 0);
|
||
assert(usec);
|
||
|
||
/* Until Linux gets a real concept of birthtime/creation time,
|
||
* let's fake one with xattrs */
|
||
|
||
n = fgetxattr(fd, "user.crtime_usec", &le, sizeof(le));
|
||
if (n < 0)
|
||
return -errno;
|
||
if (n != sizeof(le))
|
||
return -EIO;
|
||
|
||
return parse_crtime(le, usec);
|
||
}
|
||
|
||
int fd_getcrtime_at(int dirfd, const char *name, usec_t *usec, int flags) {
|
||
le64_t le;
|
||
ssize_t n;
|
||
|
||
n = fgetxattrat_fake(dirfd, name, "user.crtime_usec", &le, sizeof(le), flags);
|
||
if (n < 0)
|
||
return -errno;
|
||
if (n != sizeof(le))
|
||
return -EIO;
|
||
|
||
return parse_crtime(le, usec);
|
||
}
|
||
|
||
int path_getcrtime(const char *p, usec_t *usec) {
|
||
le64_t le;
|
||
ssize_t n;
|
||
|
||
assert(p);
|
||
assert(usec);
|
||
|
||
n = getxattr(p, "user.crtime_usec", &le, sizeof(le));
|
||
if (n < 0)
|
||
return -errno;
|
||
if (n != sizeof(le))
|
||
return -EIO;
|
||
|
||
return parse_crtime(le, usec);
|
||
}
|
||
|
||
int fd_setcrtime(int fd, usec_t usec) {
|
||
le64_t le;
|
||
|
||
assert(fd >= 0);
|
||
|
||
if (usec <= 0)
|
||
usec = now(CLOCK_REALTIME);
|
||
|
||
le = htole64((uint64_t) usec);
|
||
if (fsetxattr(fd, "user.crtime_usec", &le, sizeof(le), 0) < 0)
|
||
return -errno;
|
||
|
||
return 0;
|
||
}
|
||
|
||
int chattr_fd(int fd, unsigned value, unsigned mask) {
|
||
unsigned old_attr, new_attr;
|
||
struct stat st;
|
||
|
||
assert(fd >= 0);
|
||
|
||
if (fstat(fd, &st) < 0)
|
||
return -errno;
|
||
|
||
/* Explicitly check whether this is a regular file or
|
||
* directory. If it is anything else (such as a device node or
|
||
* fifo), then the ioctl will not hit the file systems but
|
||
* possibly drivers, where the ioctl might have different
|
||
* effects. Notably, DRM is using the same ioctl() number. */
|
||
|
||
if (!S_ISDIR(st.st_mode) && !S_ISREG(st.st_mode))
|
||
return -ENOTTY;
|
||
|
||
if (mask == 0)
|
||
return 0;
|
||
|
||
if (ioctl(fd, FS_IOC_GETFLAGS, &old_attr) < 0)
|
||
return -errno;
|
||
|
||
new_attr = (old_attr & ~mask) | (value & mask);
|
||
if (new_attr == old_attr)
|
||
return 0;
|
||
|
||
if (ioctl(fd, FS_IOC_SETFLAGS, &new_attr) < 0)
|
||
return -errno;
|
||
|
||
return 1;
|
||
}
|
||
|
||
int chattr_path(const char *p, unsigned value, unsigned mask) {
|
||
_cleanup_close_ int fd = -1;
|
||
|
||
assert(p);
|
||
|
||
if (mask == 0)
|
||
return 0;
|
||
|
||
fd = open(p, O_RDONLY|O_CLOEXEC|O_NOCTTY|O_NOFOLLOW);
|
||
if (fd < 0)
|
||
return -errno;
|
||
|
||
return chattr_fd(fd, value, mask);
|
||
}
|
||
|
||
int read_attr_fd(int fd, unsigned *ret) {
|
||
struct stat st;
|
||
|
||
assert(fd >= 0);
|
||
|
||
if (fstat(fd, &st) < 0)
|
||
return -errno;
|
||
|
||
if (!S_ISDIR(st.st_mode) && !S_ISREG(st.st_mode))
|
||
return -ENOTTY;
|
||
|
||
if (ioctl(fd, FS_IOC_GETFLAGS, ret) < 0)
|
||
return -errno;
|
||
|
||
return 0;
|
||
}
|
||
|
||
int read_attr_path(const char *p, unsigned *ret) {
|
||
_cleanup_close_ int fd = -1;
|
||
|
||
assert(p);
|
||
assert(ret);
|
||
|
||
fd = open(p, O_RDONLY|O_CLOEXEC|O_NOCTTY|O_NOFOLLOW);
|
||
if (fd < 0)
|
||
return -errno;
|
||
|
||
return read_attr_fd(fd, ret);
|
||
}
|
||
|
||
int syslog_parse_priority(const char **p, int *priority, bool with_facility) {
|
||
int a = 0, b = 0, c = 0;
|
||
int k;
|
||
|
||
assert(p);
|
||
assert(*p);
|
||
assert(priority);
|
||
|
||
if ((*p)[0] != '<')
|
||
return 0;
|
||
|
||
if (!strchr(*p, '>'))
|
||
return 0;
|
||
|
||
if ((*p)[2] == '>') {
|
||
c = undecchar((*p)[1]);
|
||
k = 3;
|
||
} else if ((*p)[3] == '>') {
|
||
b = undecchar((*p)[1]);
|
||
c = undecchar((*p)[2]);
|
||
k = 4;
|
||
} else if ((*p)[4] == '>') {
|
||
a = undecchar((*p)[1]);
|
||
b = undecchar((*p)[2]);
|
||
c = undecchar((*p)[3]);
|
||
k = 5;
|
||
} else
|
||
return 0;
|
||
|
||
if (a < 0 || b < 0 || c < 0 ||
|
||
(!with_facility && (a || b || c > 7)))
|
||
return 0;
|
||
|
||
if (with_facility)
|
||
*priority = a*100 + b*10 + c;
|
||
else
|
||
*priority = (*priority & LOG_FACMASK) | c;
|
||
|
||
*p += k;
|
||
return 1;
|
||
}
|
||
|
||
ssize_t string_table_lookup(const char * const *table, size_t len, const char *key) {
|
||
size_t i;
|
||
|
||
if (!key)
|
||
return -1;
|
||
|
||
for (i = 0; i < len; ++i)
|
||
if (streq_ptr(table[i], key))
|
||
return (ssize_t) i;
|
||
|
||
return -1;
|
||
}
|
||
|
||
int rename_noreplace(int olddirfd, const char *oldpath, int newdirfd, const char *newpath) {
|
||
struct stat buf;
|
||
int ret;
|
||
|
||
ret = renameat2(olddirfd, oldpath, newdirfd, newpath, RENAME_NOREPLACE);
|
||
if (ret >= 0)
|
||
return 0;
|
||
|
||
/* renameat2() exists since Linux 3.15, btrfs added support for it later.
|
||
* If it is not implemented, fallback to another method. */
|
||
if (!IN_SET(errno, EINVAL, ENOSYS))
|
||
return -errno;
|
||
|
||
/* The link()/unlink() fallback does not work on directories. But
|
||
* renameat() without RENAME_NOREPLACE gives the same semantics on
|
||
* directories, except when newpath is an *empty* directory. This is
|
||
* good enough. */
|
||
ret = fstatat(olddirfd, oldpath, &buf, AT_SYMLINK_NOFOLLOW);
|
||
if (ret >= 0 && S_ISDIR(buf.st_mode)) {
|
||
ret = renameat(olddirfd, oldpath, newdirfd, newpath);
|
||
return ret >= 0 ? 0 : -errno;
|
||
}
|
||
|
||
/* If it is not a directory, use the link()/unlink() fallback. */
|
||
ret = linkat(olddirfd, oldpath, newdirfd, newpath, 0);
|
||
if (ret < 0)
|
||
return -errno;
|
||
|
||
ret = unlinkat(olddirfd, oldpath, 0);
|
||
if (ret < 0) {
|
||
/* backup errno before the following unlinkat() alters it */
|
||
ret = errno;
|
||
(void) unlinkat(newdirfd, newpath, 0);
|
||
errno = ret;
|
||
return -errno;
|
||
}
|
||
|
||
return 0;
|
||
}
|
||
|
||
int mount_move_root(const char *path) {
|
||
assert(path);
|
||
|
||
if (chdir(path) < 0)
|
||
return -errno;
|
||
|
||
if (mount(path, "/", NULL, MS_MOVE, NULL) < 0)
|
||
return -errno;
|
||
|
||
if (chroot(".") < 0)
|
||
return -errno;
|
||
|
||
if (chdir("/") < 0)
|
||
return -errno;
|
||
|
||
return 0;
|
||
}
|
||
|
||
int getxattr_malloc(const char *path, const char *name, char **value, bool allow_symlink) {
|
||
char *v;
|
||
size_t l;
|
||
ssize_t n;
|
||
|
||
assert(path);
|
||
assert(name);
|
||
assert(value);
|
||
|
||
for (l = 100; ; l = (size_t) n + 1) {
|
||
v = new0(char, l);
|
||
if (!v)
|
||
return -ENOMEM;
|
||
|
||
if (allow_symlink)
|
||
n = lgetxattr(path, name, v, l);
|
||
else
|
||
n = getxattr(path, name, v, l);
|
||
|
||
if (n >= 0 && (size_t) n < l) {
|
||
*value = v;
|
||
return n;
|
||
}
|
||
|
||
free(v);
|
||
|
||
if (n < 0 && errno != ERANGE)
|
||
return -errno;
|
||
|
||
if (allow_symlink)
|
||
n = lgetxattr(path, name, NULL, 0);
|
||
else
|
||
n = getxattr(path, name, NULL, 0);
|
||
if (n < 0)
|
||
return -errno;
|
||
}
|
||
}
|
||
|
||
int fgetxattr_malloc(int fd, const char *name, char **value) {
|
||
char *v;
|
||
size_t l;
|
||
ssize_t n;
|
||
|
||
assert(fd >= 0);
|
||
assert(name);
|
||
assert(value);
|
||
|
||
for (l = 100; ; l = (size_t) n + 1) {
|
||
v = new0(char, l);
|
||
if (!v)
|
||
return -ENOMEM;
|
||
|
||
n = fgetxattr(fd, name, v, l);
|
||
|
||
if (n >= 0 && (size_t) n < l) {
|
||
*value = v;
|
||
return n;
|
||
}
|
||
|
||
free(v);
|
||
|
||
if (n < 0 && errno != ERANGE)
|
||
return -errno;
|
||
|
||
n = fgetxattr(fd, name, NULL, 0);
|
||
if (n < 0)
|
||
return -errno;
|
||
}
|
||
}
|
||
|
||
int version(void) {
|
||
puts(PACKAGE_STRING "\n"
|
||
SYSTEMD_FEATURES);
|
||
return 0;
|
||
}
|
||
|
||
bool fdname_is_valid(const char *s) {
|
||
const char *p;
|
||
|
||
/* Validates a name for $LISTEN_FDNAMES. We basically allow
|
||
* everything ASCII that's not a control character. Also, as
|
||
* special exception the ":" character is not allowed, as we
|
||
* use that as field separator in $LISTEN_FDNAMES.
|
||
*
|
||
* Note that the empty string is explicitly allowed
|
||
* here. However, we limit the length of the names to 255
|
||
* characters. */
|
||
|
||
if (!s)
|
||
return false;
|
||
|
||
for (p = s; *p; p++) {
|
||
if (*p < ' ')
|
||
return false;
|
||
if (*p >= 127)
|
||
return false;
|
||
if (*p == ':')
|
||
return false;
|
||
}
|
||
|
||
return p - s < 256;
|
||
}
|
||
|
||
bool oom_score_adjust_is_valid(int oa) {
|
||
return oa >= OOM_SCORE_ADJ_MIN && oa <= OOM_SCORE_ADJ_MAX;
|
||
}
|