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Diffstat (limited to 'src/random-seed/random-seed.c')
-rw-r--r--src/random-seed/random-seed.c176
1 files changed, 0 insertions, 176 deletions
diff --git a/src/random-seed/random-seed.c b/src/random-seed/random-seed.c
deleted file mode 100644
index 6748bb9dd3..0000000000
--- a/src/random-seed/random-seed.c
+++ /dev/null
@@ -1,176 +0,0 @@
-/***
- 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 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
- Lesser General Public License for more details.
-
- 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 <errno.h>
-#include <fcntl.h>
-#include <string.h>
-#include <sys/stat.h>
-#include <unistd.h>
-
-#include "alloc-util.h"
-#include "fd-util.h"
-#include "io-util.h"
-#include "log.h"
-#include "mkdir.h"
-#include "string-util.h"
-#include "util.h"
-
-#define POOL_SIZE_MIN 512
-
-int main(int argc, char *argv[]) {
- _cleanup_close_ int seed_fd = -1, random_fd = -1;
- _cleanup_free_ void* buf = NULL;
- size_t buf_size = 0;
- ssize_t k;
- int r, open_rw_error;
- FILE *f;
- bool refresh_seed_file = true;
-
- if (argc != 2) {
- log_error("This program requires one argument.");
- return EXIT_FAILURE;
- }
-
- log_set_target(LOG_TARGET_AUTO);
- log_parse_environment();
- log_open();
-
- umask(0022);
-
- /* Read pool size, if possible */
- f = fopen("/proc/sys/kernel/random/poolsize", "re");
- if (f) {
- if (fscanf(f, "%zu", &buf_size) > 0)
- /* poolsize is in bits on 2.6, but we want bytes */
- buf_size /= 8;
-
- fclose(f);
- }
-
- if (buf_size <= POOL_SIZE_MIN)
- buf_size = POOL_SIZE_MIN;
-
- buf = malloc(buf_size);
- if (!buf) {
- r = log_oom();
- goto finish;
- }
-
- r = mkdir_parents_label(RANDOM_SEED, 0755);
- if (r < 0) {
- log_error_errno(r, "Failed to create directory " RANDOM_SEED_DIR ": %m");
- goto finish;
- }
-
- /* 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")) {
-
- seed_fd = open(RANDOM_SEED, O_RDWR|O_CLOEXEC|O_NOCTTY|O_CREAT, 0600);
- open_rw_error = -errno;
- if (seed_fd < 0) {
- refresh_seed_file = false;
-
- seed_fd = open(RANDOM_SEED, O_RDONLY|O_CLOEXEC|O_NOCTTY);
- if (seed_fd < 0) {
- bool missing = errno == ENOENT;
-
- log_full_errno(missing ? LOG_DEBUG : LOG_ERR,
- open_rw_error, "Failed to open " RANDOM_SEED " for writing: %m");
- r = log_full_errno(missing ? LOG_DEBUG : LOG_ERR,
- errno, "Failed to open " RANDOM_SEED " for reading: %m");
- if (missing)
- r = 0;
-
- goto finish;
- }
- }
-
- random_fd = open("/dev/urandom", O_RDWR|O_CLOEXEC|O_NOCTTY, 0600);
- if (random_fd < 0) {
- random_fd = open("/dev/urandom", O_WRONLY|O_CLOEXEC|O_NOCTTY, 0600);
- if (random_fd < 0) {
- r = log_error_errno(errno, "Failed to open /dev/urandom: %m");
- goto finish;
- }
- }
-
- k = loop_read(seed_fd, buf, buf_size, false);
- if (k < 0)
- r = log_error_errno(k, "Failed to read seed from " RANDOM_SEED ": %m");
- else if (k == 0) {
- r = 0;
- log_debug("Seed file " RANDOM_SEED " not yet initialized, proceeding.");
- } else {
- (void) lseek(seed_fd, 0, SEEK_SET);
-
- r = loop_write(random_fd, buf, (size_t) k, false);
- if (r < 0)
- log_error_errno(r, "Failed to write seed to /dev/urandom: %m");
- }
-
- } else if (streq(argv[1], "save")) {
-
- seed_fd = open(RANDOM_SEED, O_WRONLY|O_CLOEXEC|O_NOCTTY|O_CREAT, 0600);
- if (seed_fd < 0) {
- r = log_error_errno(errno, "Failed to open " RANDOM_SEED ": %m");
- goto finish;
- }
-
- random_fd = open("/dev/urandom", O_RDONLY|O_CLOEXEC|O_NOCTTY);
- if (random_fd < 0) {
- r = log_error_errno(errno, "Failed to open /dev/urandom: %m");
- goto finish;
- }
-
- } else {
- log_error("Unknown verb '%s'.", argv[1]);
- r = -EINVAL;
- goto finish;
- }
-
- if (refresh_seed_file) {
-
- /* 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. */
- (void) fchmod(seed_fd, 0600);
- (void) fchown(seed_fd, 0, 0);
-
- k = loop_read(random_fd, buf, buf_size, false);
- if (k < 0) {
- r = log_error_errno(k, "Failed to read new seed from /dev/urandom: %m");
- goto finish;
- }
- if (k == 0) {
- log_error("Got EOF while reading from /dev/urandom.");
- r = -EIO;
- goto finish;
- }
-
- r = loop_write(seed_fd, buf, (size_t) k, false);
- if (r < 0)
- log_error_errno(r, "Failed to write new random seed file: %m");
- }
-
-finish:
- return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;
-}