Copyright 2010 Lennart Poettering
systemd is free software; you can redistribute it and/or modify it
- under the terms of the GNU General Public License as published by
- the Free Software Foundation; either version 2 of the License, or
+ under the terms of the GNU Lesser General Public License as published by
+ the Free Software Foundation; either version 2.1 of the License, or
(at your option) any later version.
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
- General Public License for more details.
+ Lesser General Public License for more details.
- You should have received a copy of the GNU General Public License
+ You should have received a copy of the GNU Lesser General Public License
along with systemd; If not, see <http://www.gnu.org/licenses/>.
***/
#include <unistd.h>
-#include <stdio.h>
-#include <errno.h>
-#include <string.h>
#include <stdlib.h>
-#include <fcntl.h>
-#include <sys/mount.h>
-#include "machine-id-setup.h"
-#include "macro.h"
-#include "util.h"
+#include "machine-id-util.h"
#include "log.h"
-#include "sd-id128.h"
-static int generate(char id[34]) {
- int fd, r;
- unsigned char *p;
- sd_id128_t buf;
- char *q;
- ssize_t k;
+int main(int argc, char *argv[]) {
- assert(id);
+ log_set_target(LOG_TARGET_AUTO);
+ log_parse_environment();
+ log_open();
- /* First, try reading the D-Bus machine id, unless it is a symlink */
- fd = open("/var/lib/dbus/machine-id", O_RDONLY|O_CLOEXEC|O_NOCTTY|O_NOFOLLOW);
- if (fd >= 0) {
-
- k = loop_read(fd, id, 33, false);
- close_nointr_nofail(fd);
-
- if (k >= 32) {
- id[32] = '\n';
- id[33] = 0;
-
- log_info("Initializing machine ID from D-Bus machine ID.");
- return 0;
- }
- }
-
- /* If that didn't work, generate a random machine id */
- r = sd_id128_randomize(&buf);
- if (r < 0) {
- log_error("Failed to open /dev/urandom: %s", strerror(-r));
- return r;
- }
-
- for (p = buf.bytes, q = id; p < buf.bytes + sizeof(buf); p++, q += 2) {
- q[0] = hexchar(*p >> 4);
- q[1] = hexchar(*p & 15);
- }
-
- id[32] = '\n';
- id[33] = 0;
-
- log_info("Initializing machine ID from random generator.");
-
- return 0;
-}
-
-int machine_id_setup(void) {
- int fd, r;
- bool writable;
- struct stat st;
- char id[34]; /* 32 + \n + \0 */
- mode_t m;
-
- m = umask(0000);
-
- /* We create this 0444, to indicate that this isn't really
- * something you should ever modify. Of course, since the file
- * will be owned by root it doesn't matter much, but maybe
- * people look. */
-
- fd = open("/etc/machine-id", O_RDWR|O_CREAT|O_CLOEXEC|O_NOCTTY, 0444);
- if (fd >= 0)
- writable = true;
- else {
- fd = open("/etc/machine-id", O_RDONLY|O_CLOEXEC|O_NOCTTY);
- if (fd < 0) {
- umask(m);
- log_error("Cannot open /etc/machine-id: %m");
- return -errno;
- }
-
- writable = false;
- }
-
- umask(m);
-
- if (fstat(fd, &st) < 0) {
- log_error("fstat() failed: %m");
- r = -errno;
- goto finish;
- }
-
- if (S_ISREG(st.st_mode)) {
- if (loop_read(fd, id, 32, false) >= 32) {
- r = 0;
- goto finish;
- }
- }
-
- /* Hmm, so, the id currently stored is not useful, then let's
- * generate one */
-
- r = generate(id);
- if (r < 0)
- goto finish;
-
- if (S_ISREG(st.st_mode) && writable) {
- lseek(fd, 0, SEEK_SET);
-
- if (loop_write(fd, id, 33, false) == 33) {
- r = 0;
- goto finish;
- }
- }
-
- close_nointr_nofail(fd);
- fd = -1;
-
- /* Hmm, we couldn't write it? So let's write it to
- * /run/systemd/machine-id as a replacement */
-
- mkdir_p("/run/systemd", 0755);
-
- m = umask(0022);
- r = write_one_line_file("/run/systemd/machine-id", id);
- umask(m);
-
- if (r < 0) {
- log_error("Cannot write /run/systemd/machine-id: %s", strerror(-r));
-
- unlink("/run/systemd/machine-id");
- goto finish;
- }
-
- /* And now, let's mount it over */
- r = mount("/run/systemd/machine-id", "/etc/machine-id", "bind", MS_BIND|MS_RDONLY, NULL) < 0 ? -errno : 0;
- unlink("/run/systemd/machine-id");
-
- if (r < 0)
- log_error("Failed to mount /etc/machine-id: %s", strerror(-r));
- else
- log_info("Installed transient /etc/machine-id file.");
-
-finish:
-
- if (fd >= 0)
- close_nointr_nofail(fd);
-
- return r;
+ return machine_id_setup() < 0 ? EXIT_FAILURE : EXIT_SUCCESS;
}
~ianmdlvl / elogind.git / blobdiff