2 * collectd - src/uuid.c
3 * Copyright (C) 2007 Red Hat Inc.
4 * Copyright (C) 2015 Ruben Kerkhof
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License as published by the
8 * Free Software Foundation; only version 2 of the License is applicable.
10 * This program is distributed in the hope that it will be useful, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * General Public License for more details.
15 * You should have received a copy of the GNU General Public License along
16 * with this program; if not, write to the Free Software Foundation, Inc.,
17 * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
20 * Dan Berrange <berrange@redhat.com>
21 * Richard W.M. Jones <rjones@redhat.com>
23 * Derived from UUID detection code by Dan Berrange <berrange@redhat.com>
24 * http://hg.et.redhat.com/virt/daemons/spectre--devel?f=f6e3a1b06433;file=lib/uuid.c
33 #include <sys/sysctl.h>
36 #define UUID_RAW_LENGTH 16
37 #define UUID_PRINTABLE_COMPACT_LENGTH (UUID_RAW_LENGTH * 2)
38 #define UUID_PRINTABLE_NORMAL_LENGTH (UUID_PRINTABLE_COMPACT_LENGTH + 4)
40 static char *uuidfile;
42 static const char *config_keys[] = {"UUIDFile"};
44 static int looks_like_a_uuid(const char *uuid) {
48 size_t len = strlen(uuid);
49 if (len < UUID_PRINTABLE_COMPACT_LENGTH)
53 if (!isxdigit((int)*uuid) && *uuid != '-')
60 static char *uuid_parse_dmidecode(FILE *file) {
63 while (fgets(line, sizeof(line), file) != NULL) {
67 strstripnewline(line);
69 /* Look for a line reading:
70 * UUID: XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX
72 fields_num = strsplit(line, fields, STATIC_ARRAY_SIZE(fields));
76 if (strcmp("UUID:", fields[0]) != 0)
79 if (!looks_like_a_uuid(fields[1]))
82 return strdup(fields[1]);
87 static char *uuid_get_from_dmidecode(void) {
88 FILE *dmidecode = popen("dmidecode -t system 2>/dev/null", "r");
94 uuid = uuid_parse_dmidecode(dmidecode);
100 #if defined(__APPLE__) || defined(__FreeBSD__) || defined(__NetBSD__)
101 static char *uuid_get_from_sysctlbyname(const char *name) {
102 char uuid[UUID_PRINTABLE_NORMAL_LENGTH + 1];
103 size_t len = sizeof(uuid);
104 if (sysctlbyname(name, &uuid, &len, NULL, 0) == -1)
108 #elif defined(__OpenBSD__)
109 static char *uuid_get_from_sysctl(void) {
110 char uuid[UUID_PRINTABLE_NORMAL_LENGTH + 1];
111 size_t len = sizeof(uuid);
117 if (sysctl(mib, 2, uuid, &len, NULL, 0) == -1)
123 static char *uuid_get_from_file(const char *path) {
125 char uuid[UUID_PRINTABLE_NORMAL_LENGTH + 1] = "";
127 file = fopen(path, "r");
131 if (!fgets(uuid, sizeof(uuid), file)) {
136 strstripnewline(uuid);
141 static char *uuid_get_local(void) {
144 /* Check /etc/uuid / UUIDFile before any other method. */
145 if ((uuid = uuid_get_from_file(uuidfile ? uuidfile : "/etc/uuid")) != NULL)
148 #if defined(__APPLE__)
149 if ((uuid = uuid_get_from_sysctlbyname("kern.uuid")) != NULL)
151 #elif defined(__FreeBSD__)
152 if ((uuid = uuid_get_from_sysctlbyname("kern.hostuuid")) != NULL)
154 #elif defined(__NetBSD__)
155 if ((uuid = uuid_get_from_sysctlbyname("machdep.dmi.system-uuid")) != NULL)
157 #elif defined(__OpenBSD__)
158 if ((uuid = uuid_get_from_sysctl()) != NULL)
160 #elif defined(__linux__)
161 if ((uuid = uuid_get_from_file("/sys/class/dmi/id/product_uuid")) != NULL)
165 if ((uuid = uuid_get_from_dmidecode()) != NULL)
168 #if defined(__linux__)
169 if ((uuid = uuid_get_from_file("/sys/hypervisor/uuid")) != NULL)
176 static int uuid_config(const char *key, const char *value) {
177 if (strcasecmp(key, "UUIDFile") == 0) {
178 char *tmp = strdup(value);
189 static int uuid_init(void) {
190 char *uuid = uuid_get_local();
198 WARNING("uuid: could not read UUID using any known method");
202 void module_register(void) {
203 plugin_register_config("uuid", uuid_config, config_keys,
204 STATIC_ARRAY_SIZE(config_keys));
205 plugin_register_init("uuid", uuid_init);