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 = NULL;
42 static const char *config_keys[] = {"UUIDFile"};
44 static int looks_like_a_uuid(const char *uuid) {
52 if (len < UUID_PRINTABLE_COMPACT_LENGTH)
56 if (!isxdigit((int)*uuid) && *uuid != '-')
63 static char *uuid_parse_dmidecode(FILE *file) {
66 while (fgets(line, sizeof(line), file) != NULL) {
70 strstripnewline(line);
72 /* Look for a line reading:
73 * UUID: XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX
75 fields_num = strsplit(line, fields, STATIC_ARRAY_SIZE(fields));
79 if (strcmp("UUID:", fields[0]) != 0)
82 if (!looks_like_a_uuid(fields[1]))
85 return strdup(fields[1]);
90 static char *uuid_get_from_dmidecode(void) {
91 FILE *dmidecode = popen("dmidecode -t system 2>/dev/null", "r");
97 uuid = uuid_parse_dmidecode(dmidecode);
103 #if defined(__APPLE__) || defined(__FreeBSD__) || defined(__NetBSD__)
104 static char *uuid_get_from_sysctlbyname(const char *name) {
105 char uuid[UUID_PRINTABLE_NORMAL_LENGTH + 1];
106 size_t len = sizeof(uuid);
107 if (sysctlbyname(name, &uuid, &len, NULL, 0) == -1)
111 #elif defined(__OpenBSD__)
112 static char *uuid_get_from_sysctl(void) {
113 char uuid[UUID_PRINTABLE_NORMAL_LENGTH + 1];
114 size_t len = sizeof(uuid);
120 if (sysctl(mib, 2, uuid, &len, NULL, 0) == -1)
126 static char *uuid_get_from_file(const char *path) {
128 char uuid[UUID_PRINTABLE_NORMAL_LENGTH + 1] = "";
130 file = fopen(path, "r");
134 if (!fgets(uuid, sizeof(uuid), file)) {
139 strstripnewline(uuid);
144 static char *uuid_get_local(void) {
147 /* Check /etc/uuid / UUIDFile before any other method. */
148 if ((uuid = uuid_get_from_file(uuidfile ? uuidfile : "/etc/uuid")) != NULL)
151 #if defined(__APPLE__)
152 if ((uuid = uuid_get_from_sysctlbyname("kern.uuid")) != NULL)
154 #elif defined(__FreeBSD__)
155 if ((uuid = uuid_get_from_sysctlbyname("kern.hostuuid")) != NULL)
157 #elif defined(__NetBSD__)
158 if ((uuid = uuid_get_from_sysctlbyname("machdep.dmi.system-uuid")) != NULL)
160 #elif defined(__OpenBSD__)
161 if ((uuid = uuid_get_from_sysctl()) != NULL)
163 #elif defined(__linux__)
164 if ((uuid = uuid_get_from_file("/sys/class/dmi/id/product_uuid")) != NULL)
168 if ((uuid = uuid_get_from_dmidecode()) != NULL)
171 #if defined(__linux__)
172 if ((uuid = uuid_get_from_file("/sys/hypervisor/uuid")) != NULL)
179 static int uuid_config(const char *key, const char *value) {
180 if (strcasecmp(key, "UUIDFile") == 0) {
181 char *tmp = strdup(value);
192 static int uuid_init(void) {
193 char *uuid = uuid_get_local();
201 WARNING("uuid: could not read UUID using any known method");
205 void module_register(void) {
206 plugin_register_config("uuid", uuid_config, config_keys,
207 STATIC_ARRAY_SIZE(config_keys));
208 plugin_register_init("uuid", uuid_init);