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/* Copyright (c) 2009, 2010, 2013 Nicira, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at:
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <config.h>
#include "xenserver.h"
#include <ctype.h>
#include <errno.h>
#include <pthread.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "openvswitch/dynamic-string.h"
#include "process.h"
#include "util.h"
#include "openvswitch/vlog.h"
VLOG_DEFINE_THIS_MODULE(xenserver);
/* If running on a XenServer, the XenServer host UUID as a 36-character string,
* otherwise null. */
static char *host_uuid;
static void
read_host_uuid(void)
{
static const char filename[] = "/etc/xensource-inventory";
char line[128];
FILE *file;
file = fopen(filename, "r");
if (!file) {
if (errno == ENOENT) {
VLOG_DBG("not running on a XenServer");
} else {
VLOG_INFO("%s: open: %s", filename, ovs_strerror(errno));
}
return;
}
while (fgets(line, sizeof line, file)) {
static const char leader[] = "INSTALLATION_UUID='";
const int leader_len = strlen(leader);
const int uuid_len = 36;
static const char trailer[] = "'\n";
const int trailer_len = strlen(trailer);
if (strlen(line) == leader_len + uuid_len + trailer_len
&& !memcmp(line, leader, leader_len)
&& !memcmp(line + leader_len + uuid_len, trailer, trailer_len)) {
host_uuid = xmemdup0(line + leader_len, uuid_len);
VLOG_INFO("running on XenServer, host-uuid %s", host_uuid);
fclose(file);
return;
}
}
fclose(file);
VLOG_ERR("%s: INSTALLATION_UUID not found", filename);
}
const char *
xenserver_get_host_uuid(void)
{
static pthread_once_t once = PTHREAD_ONCE_INIT;
pthread_once(&once, read_host_uuid);
return host_uuid;
}
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