diff options
author | Kay Sievers <kay@vrfy.org> | 2012-04-12 01:51:49 +0200 |
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committer | Kay Sievers <kay@vrfy.org> | 2012-04-12 02:39:37 +0200 |
commit | f33d3ec1d7521c91da8b30ad5cb345d6416bb07d (patch) | |
tree | 8f0d1b16753d3370ea6223f0f10da1625c12c681 /src/machine-id-setup.c | |
parent | 5e6f883dfcd2befce26102eba972d4c1d814dfdf (diff) |
move more common files to shared/ and add them to shared.la
Diffstat (limited to 'src/machine-id-setup.c')
-rw-r--r-- | src/machine-id-setup.c | 265 |
1 files changed, 0 insertions, 265 deletions
diff --git a/src/machine-id-setup.c b/src/machine-id-setup.c deleted file mode 100644 index 9e84ac0cb9..0000000000 --- a/src/machine-id-setup.c +++ /dev/null @@ -1,265 +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 <stdio.h> -#include <errno.h> -#include <string.h> -#include <stdlib.h> -#include <fcntl.h> -#include <sys/mount.h> - -#include <systemd/sd-id128.h> - -#include "machine-id-setup.h" -#include "macro.h" -#include "util.h" -#include "mkdir.h" -#include "log.h" -#include "virt.h" - -static int shorten_uuid(char destination[36], const char *source) { - unsigned i, j; - - for (i = 0, j = 0; i < 36 && j < 32; i++) { - int t; - - t = unhexchar(source[i]); - if (t < 0) - continue; - - destination[j++] = hexchar(t); - } - - if (i == 36 && j == 32) { - destination[32] = '\n'; - destination[33] = 0; - return 0; - } - - return -EINVAL; -} - -static int generate(char id[34]) { - int fd, r; - unsigned char *p; - sd_id128_t buf; - char *q; - ssize_t k; - const char *vm_id; - - assert(id); - - /* 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, 32, 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, see if we are running in qemu/kvm and a - * machine ID was passed in via -uuid on the qemu/kvm command - * line */ - - r = detect_vm(&vm_id); - if (r > 0 && streq(vm_id, "kvm")) { - char uuid[37]; - - fd = open("/sys/class/dmi/id/product_uuid", O_RDONLY|O_CLOEXEC|O_NOCTTY|O_NOFOLLOW); - if (fd >= 0) { - k = loop_read(fd, uuid, 36, false); - close_nointr_nofail(fd); - - if (k >= 36) { - r = shorten_uuid(id, uuid); - if (r >= 0) { - log_info("Initializing machine ID from KVM UUID"); - return 0; - } - } - } - } - - /* If that didn't work either, see if we are running in a - * container, and a machine ID was passed in via - * $container_uuid the way libvirt/LXC does it */ - - r = detect_container(NULL); - if (r > 0) { - FILE *f; - - f = fopen("/proc/1/environ", "re"); - if (f) { - bool done = false; - - do { - char line[LINE_MAX]; - unsigned i; - - for (i = 0; i < sizeof(line)-1; i++) { - int c; - - c = getc(f); - if (_unlikely_(c == EOF)) { - done = true; - break; - } else if (c == 0) - break; - - line[i] = c; - } - line[i] = 0; - - if (startswith(line, "container_uuid=") && - strlen(line + 15) >= 36) { - r = shorten_uuid(id, line + 15); - if (r >= 0) { - log_info("Initializing machine ID from container UUID"); - return 0; - } - } - - } while (!done); - - fclose(f); - } - } - - /* 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/machine-id as a replacement */ - - m = umask(0022); - r = write_one_line_file("/run/machine-id", id); - umask(m); - - if (r < 0) { - log_error("Cannot write /run/machine-id: %s", strerror(-r)); - - unlink("/run/machine-id"); - goto finish; - } - - /* And now, let's mount it over */ - r = mount("/run/machine-id", "/etc/machine-id", "bind", MS_BIND|MS_RDONLY, NULL) < 0 ? -errno : 0; - if (r < 0) { - unlink("/run/machine-id"); - 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; -} |