random-seed: add missing random-seed.c file
This commit is contained in:
parent
d6c9574fb5
commit
6e200d55ae
|
@ -1,3 +1,4 @@
|
|||
systemd-random-seed
|
||||
systemd-update-utmp
|
||||
test-env-replace
|
||||
systemd-cgls
|
||||
|
|
|
@ -0,0 +1,112 @@
|
|||
/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
|
||||
|
||||
/***
|
||||
This file is part of systemd.
|
||||
|
||||
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
|
||||
(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.
|
||||
|
||||
You should have received a copy of the GNU General Public License
|
||||
along with systemd; If not, see <http://www.gnu.org/licenses/>.
|
||||
***/
|
||||
|
||||
#include <unistd.h>
|
||||
#include <fcntl.h>
|
||||
#include <errno.h>
|
||||
#include <string.h>
|
||||
#include <sys/stat.h>
|
||||
|
||||
#include "log.h"
|
||||
#include "util.h"
|
||||
|
||||
int main(int argc, char *argv[]) {
|
||||
int seed_fd = -1, random_fd = -1;
|
||||
int ret = 1;
|
||||
uint8_t buf[512];
|
||||
ssize_t r;
|
||||
|
||||
if (argc != 2) {
|
||||
log_error("This program requires one argument.");
|
||||
return 1;
|
||||
}
|
||||
|
||||
log_parse_environment();
|
||||
|
||||
/* When we load the seed we read it and write it to the device
|
||||
* and then immediately update the saved seed with new data,
|
||||
* to make sure the next boot gets seeded differently. */
|
||||
|
||||
if (streq(argv[1], "load")) {
|
||||
|
||||
if ((seed_fd = open(RANDOM_SEED, O_RDWR|O_CLOEXEC|O_NOCTTY|O_CREAT, 0600)) < 0) {
|
||||
if ((seed_fd = open(RANDOM_SEED, O_RDONLY|O_CLOEXEC|O_NOCTTY)) < 0) {
|
||||
log_error("Failed to open random seed: %m");
|
||||
goto finish;
|
||||
}
|
||||
}
|
||||
|
||||
if ((random_fd = open("/dev/urandom", O_RDWR|O_CLOEXEC|O_NOCTTY, 0600)) < 0) {
|
||||
if ((random_fd = open("/dev/urandom", O_WRONLY|O_CLOEXEC|O_NOCTTY, 0600)) < 0) {
|
||||
log_error("Failed to open /dev/urandom: %m");
|
||||
goto finish;
|
||||
}
|
||||
}
|
||||
|
||||
if ((r = loop_read(seed_fd, buf, sizeof(buf), false)) != sizeof(buf))
|
||||
log_error("Failed to read seed file: %s", r < 0 ? strerror(errno) : "EOF");
|
||||
else {
|
||||
lseek(seed_fd, 0, SEEK_SET);
|
||||
|
||||
if ((r = loop_write(random_fd, buf, sizeof(buf), false)) != sizeof(buf))
|
||||
log_error("Failed to write seed to /dev/random: %s", r < 0 ? strerror(errno) : "short write");
|
||||
}
|
||||
|
||||
} else if (streq(argv[1], "save")) {
|
||||
|
||||
if ((seed_fd = open(RANDOM_SEED, O_WRONLY|O_CLOEXEC|O_NOCTTY|O_CREAT, 0600)) < 0) {
|
||||
log_error("Failed to open random seed: %m");
|
||||
goto finish;
|
||||
}
|
||||
|
||||
if ((random_fd = open("/dev/urandom", O_RDONLY|O_CLOEXEC|O_NOCTTY)) < 0) {
|
||||
log_error("Failed to open /dev/urandom: %m");
|
||||
goto finish;
|
||||
}
|
||||
} else {
|
||||
log_error("Unknown verb %s.", argv[1]);
|
||||
goto finish;
|
||||
}
|
||||
|
||||
/* This is just a safety measure. Given that we are root and
|
||||
* most likely created the file ourselves the mode and owner
|
||||
* should be correct anyway. */
|
||||
fchmod(seed_fd, 0600);
|
||||
fchown(seed_fd, 0, 0);
|
||||
|
||||
if ((r = loop_read(random_fd, buf, sizeof(buf), false)) != sizeof(buf))
|
||||
log_error("Failed to read new seed from /dev/urandom: %s", r < 0 ? strerror(errno) : "EOF");
|
||||
else {
|
||||
if ((r = loop_write(seed_fd, buf, sizeof(buf), false)) != sizeof(buf))
|
||||
log_error("Failed to write new random seed file: %s", r < 0 ? strerror(errno) : "short write");
|
||||
}
|
||||
|
||||
ret = 0;
|
||||
|
||||
finish:
|
||||
if (random_fd >= 0)
|
||||
close_nointr_nofail(random_fd);
|
||||
|
||||
if (seed_fd >= 0)
|
||||
close_nointr_nofail(seed_fd);
|
||||
|
||||
return ret;
|
||||
}
|
|
@ -1,3 +1,5 @@
|
|||
systemd-random-seed-load.service
|
||||
systemd-random-seed-save.service
|
||||
systemd-initctl.service
|
||||
systemd-logger.service
|
||||
syslog.target
|
||||
|
|
Loading…
Reference in New Issue