diff options
Diffstat (limited to 'src/random-seed/random-seed.c')
| -rw-r--r-- | src/random-seed/random-seed.c | 165 |
1 files changed, 0 insertions, 165 deletions
diff --git a/src/random-seed/random-seed.c b/src/random-seed/random-seed.c deleted file mode 100644 index ce1bd195d2..0000000000 --- a/src/random-seed/random-seed.c +++ /dev/null @@ -1,165 +0,0 @@ -/*-*- 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 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 <unistd.h> -#include <fcntl.h> -#include <errno.h> -#include <string.h> -#include <sys/stat.h> - -#include "log.h" -#include "util.h" -#include "mkdir.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; - FILE *f; - bool cleanup_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); - if (seed_fd < 0) { - seed_fd = open(RANDOM_SEED, O_RDONLY|O_CLOEXEC|O_NOCTTY); - if (seed_fd < 0) { - log_error_errno(errno, "Failed to open " RANDOM_SEED ": %m"); - r = -errno; - goto finish; - } - cleanup_seed_file = false; - } - - 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) { - log_error_errno(errno, "Failed to open /dev/urandom: %m"); - r = -errno; - goto finish; - } - } - - k = loop_read(seed_fd, buf, buf_size, false); - if (k <= 0) { - - if (r != 0) - log_error_errno(errno, "Failed to read seed from " RANDOM_SEED ": %m"); - - r = k == 0 ? -EIO : (int) k; - - } else { - 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) { - log_error_errno(errno, "Failed to open " RANDOM_SEED ": %m"); - r = -errno; - goto finish; - } - - random_fd = open("/dev/urandom", O_RDONLY|O_CLOEXEC|O_NOCTTY); - if (random_fd < 0) { - log_error_errno(errno, "Failed to open /dev/urandom: %m"); - r = -errno; - goto finish; - } - - } else { - log_error("Unknown verb %s.", argv[1]); - r = -EINVAL; - goto finish; - } - - if (cleanup_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. */ - fchmod(seed_fd, 0600); - fchown(seed_fd, 0, 0); - - k = loop_read(random_fd, buf, buf_size, false); - if (k <= 0) { - log_error("Failed to read new seed from /dev/urandom: %s", r < 0 ? strerror(-r) : "EOF"); - r = k == 0 ? -EIO : (int) k; - } else { - 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; -} |