mirror of
https://github.com/openvswitch/ovs
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91 lines
2.9 KiB
C
91 lines
2.9 KiB
C
/* Copyright (c) 2009 Nicira Networks
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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* In addition, as a special exception, Nicira Networks gives permission
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* to link the code of its release of vswitchd with the OpenSSL project's
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* "OpenSSL" library (or with modified versions of it that use the same
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* license as the "OpenSSL" library), and distribute the linked
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* executables. You must obey the GNU General Public License in all
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* respects for all of the code used other than "OpenSSL". If you modify
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* this file, you may extend this exception to your version of the file,
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* but you are not obligated to do so. If you do not wish to do so,
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* delete this exception statement from your version.
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*/
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#include <config.h>
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#include "xenserver.h"
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#include <ctype.h>
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#include <errno.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include "dynamic-string.h"
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#include "process.h"
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#include "vlog.h"
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#define THIS_MODULE VLM_xenserver
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static char *
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read_host_uuid(void)
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{
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static const char filename[] = "/etc/xensource-inventory";
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char line[128];
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FILE *file;
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file = fopen(filename, "r");
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if (!file) {
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if (errno == ENOENT) {
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VLOG_INFO("not running on a XenServer");
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} else {
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VLOG_INFO("%s: open: %s", filename, strerror(errno));
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}
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return NULL;
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}
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while (fgets(line, sizeof line, file)) {
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static const char leader[] = "INSTALLATION_UUID='";
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const int leader_len = strlen(leader);
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const int uuid_len = 36;
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static const char trailer[] = "'\n";
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const int trailer_len = strlen(trailer);
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if (strlen(line) == leader_len + uuid_len + trailer_len
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&& !memcmp(line, leader, leader_len)
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&& !memcmp(line + leader_len + uuid_len, trailer, trailer_len)) {
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char *host_uuid = xmemdup0(line + leader_len, uuid_len);
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VLOG_INFO("running on XenServer, host-uuid %s", host_uuid);
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fclose(file);
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return host_uuid;
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}
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}
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fclose(file);
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VLOG_ERR("%s: INSTALLATION_UUID not found", filename);
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return NULL;
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}
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const char *
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xenserver_get_host_uuid(void)
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{
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static char *host_uuid;
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static bool inited;
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if (!inited) {
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host_uuid = read_host_uuid();
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inited = true;
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}
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return host_uuid;
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}
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