diff options
Diffstat (limited to 'src/random-seed')
| l--------- | src/random-seed/Makefile | 1 | ||||
| -rw-r--r-- | src/random-seed/random-seed.c | 149 |
2 files changed, 0 insertions, 150 deletions
diff --git a/src/random-seed/Makefile b/src/random-seed/Makefile deleted file mode 120000 index d0b0e8e008..0000000000 --- a/src/random-seed/Makefile +++ /dev/null @@ -1 +0,0 @@ -../Makefile
\ No newline at end of file diff --git a/src/random-seed/random-seed.c b/src/random-seed/random-seed.c deleted file mode 100644 index fdcaa1e154..0000000000 --- a/src/random-seed/random-seed.c +++ /dev/null @@ -1,149 +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[]) { - int seed_fd = -1, random_fd = -1; - int ret = EXIT_FAILURE; - void* buf; - size_t buf_size = 0; - ssize_t r; - FILE *f; - - 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 */ - if ((f = fopen("/proc/sys/kernel/random/poolsize", "re"))) { - 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; - - if (!(buf = malloc(buf_size))) { - log_error("Failed to allocate buffer."); - goto finish; - } - - if (mkdir_parents_label(RANDOM_SEED, 0755) < 0) { - log_error("Failed to create directories parents of %s: %m", RANDOM_SEED); - 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")) { - - 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, buf_size, false)) <= 0) { - - if (r != 0) - log_error("Failed to read seed file: %m"); - } else { - lseek(seed_fd, 0, SEEK_SET); - - if ((r = loop_write(random_fd, buf, (size_t) r, false)) <= 0) - log_error("Failed to write seed to /dev/urandom: %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, buf_size, false)) <= 0) - log_error("Failed to read new seed from /dev/urandom: %s", r < 0 ? strerror(errno) : "EOF"); - else { - if ((r = loop_write(seed_fd, buf, (size_t) r, false)) <= 0) - log_error("Failed to write new random seed file: %s", r < 0 ? strerror(errno) : "short write"); - } - - ret = EXIT_SUCCESS; - -finish: - if (random_fd >= 0) - close_nointr_nofail(random_fd); - - if (seed_fd >= 0) - close_nointr_nofail(seed_fd); - - free(buf); - - return ret; -} |