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/*
* Copyright © 2018 Red Hat, Inc
*
* This program 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.
*
* This library 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 this library. If not, see <http://www.gnu.org/licenses/>.
*
* Authors:
* Christian J. Kellner <christian@kellner.me>
*/
#include "config.h"
#include "bolt-str.h"
#include "bolt-term.h"
#include "boltctl-uidfmt.h"
#include <gio/gio.h>
#include <math.h>
#include <stdlib.h>
char *
bolt_uuid_format (const char *uuid,
const char *salt,
int fmt)
{
g_autoptr(GChecksum) chk = NULL;
const char *tmp = NULL;
guint op;
int len;
char *res;
if (uuid == NULL)
return NULL;
g_return_val_if_fail (fmt > -1, NULL);
op = fmt & 0xFF;
switch (op)
{
case BOLT_UID_FORMAT_FULL:
res = g_strdup (uuid);
break;
case BOLT_UID_FORMAT_SHORT:
res = g_strdup_printf ("%.13s%s", uuid, bolt_glyph (ELLIPSIS));
break;
case BOLT_UID_FORMAT_ALIAS:
chk = g_checksum_new (G_CHECKSUM_SHA1);
if (salt)
g_checksum_update (chk, (const guchar *) salt, -1);
g_checksum_update (chk, (const guchar *) uuid, -1);
tmp = g_checksum_get_string (chk);
res = g_strdup_printf ("%.8s-%.4s-%.4s-%.4s-%.12s",
tmp, tmp + 8, tmp + 12, tmp + 16, tmp + 20);
break;
case BOLT_UID_FORMAT_LEN:
len = MIN (fmt >> 8, 36);
res = g_strdup_printf ("%.*s%s", len, uuid,
(len < 36 ? bolt_glyph (ELLIPSIS) : ""));
break;
default:
res = NULL;
g_warning ("unknown uuid format enum value: %d", fmt);
}
return res;
}
int
bolt_uuid_format_from_string (const char *str,
GError **error)
{
char *end;
gint64 val;
if (bolt_streq (str, "short"))
return BOLT_UID_FORMAT_SHORT;
else if (bolt_streq (str, "full"))
return BOLT_UID_FORMAT_FULL;
else if (bolt_streq (str, "alias"))
return BOLT_UID_FORMAT_ALIAS;
val = g_ascii_strtoll (str, &end, 10);
if (str == end)
{
g_set_error (error, G_IO_ERROR, G_IO_ERROR_INVALID_ARGUMENT,
"uuid format: unknown style: %s", str);
return -1;
}
else if (val < 1)
{
g_set_error (error, G_IO_ERROR, G_IO_ERROR_INVALID_ARGUMENT,
"uuid format: invalid number: %s", str);
return -1;
}
else if (val > 36)
{
return BOLT_UID_FORMAT_FULL;
}
return BOLT_UID_FORMAT_LEN | (val << 8);
}
/* */
int uuids_format;
GHashTable *uuids_table;
gboolean uuids_cleanup;
char *uuids_salt;
static void
format_uid_cleanup (void)
{
g_clear_pointer (&uuids_table, g_hash_table_unref);
g_clear_pointer (&uuids_salt, g_free);
uuids_format = 0;
}
#define MACHINE_ID_PATH "/etc/machine-id"
#define BOOT_ID_PATH "/proc/sys/kernel/random/boot_id"
static char *
get_salt (void)
{
char *salt = NULL;
gboolean ok;
ok = g_file_get_contents (MACHINE_ID_PATH, &salt, NULL, NULL);
if (ok && !bolt_strzero (salt))
{
g_debug ("using machine-id as salt");
return salt;
}
ok = g_file_get_contents (BOOT_ID_PATH, &salt, NULL, NULL);
if (ok && !bolt_strzero (salt))
{
g_debug ("using boot-id as salt");
return salt;
}
g_debug ("using PACKAGE_VERSION as pseudo-salt :(");
return g_strdup (PACKAGE_VERSION);
}
int
format_uid_init (const char *str,
GError **error)
{
int fmt;
g_return_val_if_fail (str != NULL, -1);
fmt = bolt_uuid_format_from_string (str, error);
if (fmt < 0)
return fmt;
uuids_format = fmt;
if (uuids_table)
g_hash_table_unref (uuids_table);
uuids_table = g_hash_table_new_full (g_str_hash, g_str_equal,
g_free, g_free);
uuids_salt = get_salt ();
if (!uuids_cleanup)
{
uuids_cleanup = TRUE;
atexit (format_uid_cleanup);
}
return fmt;
}
const char *
format_uid (const char *uid)
{
const char *res;
char *key, *val;
if (uid == NULL)
uid = "<null>";
res = g_hash_table_lookup (uuids_table, uid);
if (res != NULL)
return res;
key = g_strdup (uid);
val = bolt_uuid_format (uid, uuids_salt, uuids_format);
g_hash_table_insert (uuids_table, key, val);
return val;
}
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