+++ /dev/null
-/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
-
-/***
- This file is part of systemd.
-
- Copyright 2011 Lennart Poettering
-
- systemd 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.
-
- systemd 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 systemd; If not, see <http://www.gnu.org/licenses/>.
-***/
-
-#include <string.h>
-#include <errno.h>
-#include <unistd.h>
-
-#include "util.h"
-#include "process-util.h"
-#include "virt.h"
-#include "fileio.h"
-
-static int detect_vm_cpuid(const char **_id) {
-
- /* Both CPUID and DMI are x86 specific interfaces... */
-#if defined(__i386__) || defined(__x86_64__)
-
- static const char cpuid_vendor_table[] =
- "XenVMMXenVMM\0" "xen\0"
- "KVMKVMKVM\0" "kvm\0"
- /* http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=1009458 */
- "VMwareVMware\0" "vmware\0"
- /* http://msdn.microsoft.com/en-us/library/ff542428.aspx */
- "Microsoft Hv\0" "microsoft\0";
-
- uint32_t eax, ecx;
- union {
- uint32_t sig32[3];
- char text[13];
- } sig = {};
- const char *j, *k;
- bool hypervisor;
-
- /* http://lwn.net/Articles/301888/ */
-
-#if defined (__i386__)
-#define REG_a "eax"
-#define REG_b "ebx"
-#elif defined (__amd64__)
-#define REG_a "rax"
-#define REG_b "rbx"
-#endif
-
- /* First detect whether there is a hypervisor */
- eax = 1;
- __asm__ __volatile__ (
- /* ebx/rbx is being used for PIC! */
- " push %%"REG_b" \n\t"
- " cpuid \n\t"
- " pop %%"REG_b" \n\t"
-
- : "=a" (eax), "=c" (ecx)
- : "0" (eax)
- );
-
- hypervisor = !!(ecx & 0x80000000U);
-
- if (hypervisor) {
-
- /* There is a hypervisor, see what it is */
- eax = 0x40000000U;
- __asm__ __volatile__ (
- /* ebx/rbx is being used for PIC! */
- " push %%"REG_b" \n\t"
- " cpuid \n\t"
- " mov %%ebx, %1 \n\t"
- " pop %%"REG_b" \n\t"
-
- : "=a" (eax), "=r" (sig.sig32[0]), "=c" (sig.sig32[1]), "=d" (sig.sig32[2])
- : "0" (eax)
- );
-
- NULSTR_FOREACH_PAIR(j, k, cpuid_vendor_table)
- if (streq(sig.text, j)) {
- *_id = k;
- return 1;
- }
-
- *_id = "other";
- return 0;
- }
-#endif
-
- return 0;
-}
-
-static int detect_vm_devicetree(const char **_id) {
-#if defined(__arm__) || defined(__aarch64__) || defined(__powerpc__) || defined(__powerpc64__)
- _cleanup_free_ char *hvtype = NULL;
- int r;
-
- r = read_one_line_file("/proc/device-tree/hypervisor/compatible", &hvtype);
- if (r >= 0) {
- if (streq(hvtype, "linux,kvm")) {
- *_id = "kvm";
- return 1;
- } else if (strstr(hvtype, "xen")) {
- *_id = "xen";
- return 1;
- }
- } else if (r == -ENOENT) {
- _cleanup_closedir_ DIR *dir = NULL;
- struct dirent *dent;
-
- dir = opendir("/proc/device-tree");
- if (!dir) {
- if (errno == ENOENT)
- return 0;
- return -errno;
- }
-
- FOREACH_DIRENT(dent, dir, return -errno) {
- if (strstr(dent->d_name, "fw-cfg")) {
- *_id = "qemu";
- return 1;
- }
- }
- }
-#endif
- return 0;
-}
-
-static int detect_vm_dmi(const char **_id) {
-
- /* Both CPUID and DMI are x86 specific interfaces... */
-#if defined(__i386__) || defined(__x86_64__)
-
- static const char *const dmi_vendors[] = {
- "/sys/class/dmi/id/sys_vendor",
- "/sys/class/dmi/id/board_vendor",
- "/sys/class/dmi/id/bios_vendor"
- };
-
- static const char dmi_vendor_table[] =
- "QEMU\0" "qemu\0"
- /* http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=1009458 */
- "VMware\0" "vmware\0"
- "VMW\0" "vmware\0"
- "innotek GmbH\0" "oracle\0"
- "Xen\0" "xen\0"
- "Bochs\0" "bochs\0";
- unsigned i;
-
- for (i = 0; i < ELEMENTSOF(dmi_vendors); i++) {
- _cleanup_free_ char *s = NULL;
- const char *j, *k;
- int r;
-
- r = read_one_line_file(dmi_vendors[i], &s);
- if (r < 0) {
- if (r != -ENOENT)
- return r;
-
- continue;
- }
-
- NULSTR_FOREACH_PAIR(j, k, dmi_vendor_table)
- if (startswith(s, j)) {
- *_id = k;
- return 1;
- }
- }
-#endif
-
- return 0;
-}
-
-/* Returns a short identifier for the various VM implementations */
-int detect_vm(const char **id) {
- _cleanup_free_ char *domcap = NULL, *cpuinfo_contents = NULL;
- static thread_local int cached_found = -1;
- static thread_local const char *cached_id = NULL;
- const char *_id = NULL;
- int r;
-
- if (_likely_(cached_found >= 0)) {
-
- if (id)
- *id = cached_id;
-
- return cached_found;
- }
-
- /* Try xen capabilities file first, if not found try high-level hypervisor sysfs file:
- *
- * https://bugs.freedesktop.org/show_bug.cgi?id=77271 */
- r = read_one_line_file("/proc/xen/capabilities", &domcap);
- if (r >= 0) {
- char *cap, *i = domcap;
-
- while ((cap = strsep(&i, ",")))
- if (streq(cap, "control_d"))
- break;
-
- if (!cap) {
- _id = "xen";
- r = 1;
- }
-
- goto finish;
-
- } else if (r == -ENOENT) {
- _cleanup_free_ char *hvtype = NULL;
-
- r = read_one_line_file("/sys/hypervisor/type", &hvtype);
- if (r >= 0) {
- if (streq(hvtype, "xen")) {
- _id = "xen";
- r = 1;
- goto finish;
- }
- } else if (r != -ENOENT)
- return r;
- } else
- return r;
-
- /* this will set _id to "other" and return 0 for unknown hypervisors */
- r = detect_vm_cpuid(&_id);
- if (r != 0)
- goto finish;
-
- r = detect_vm_dmi(&_id);
- if (r != 0)
- goto finish;
-
- r = detect_vm_devicetree(&_id);
- if (r != 0)
- goto finish;
-
- if (_id) {
- /* "other" */
- r = 1;
- goto finish;
- }
-
- /* Detect User-Mode Linux by reading /proc/cpuinfo */
- r = read_full_file("/proc/cpuinfo", &cpuinfo_contents, NULL);
- if (r < 0)
- return r;
- if (strstr(cpuinfo_contents, "\nvendor_id\t: User Mode Linux\n")) {
- _id = "uml";
- r = 1;
- goto finish;
- }
-
-#if defined(__s390__)
- {
- _cleanup_free_ char *t = NULL;
-
- r = get_status_field("/proc/sysinfo", "VM00 Control Program:", &t);
- if (r >= 0) {
- if (streq(t, "z/VM"))
- _id = "zvm";
- else
- _id = "kvm";
- r = 1;
-
- goto finish;
- }
- }
-#endif
-
- r = 0;
-
-finish:
- cached_found = r;
-
- cached_id = _id;
- if (id)
- *id = _id;
-
- return r;
-}
-
-int detect_container(const char **id) {
-
- static thread_local int cached_found = -1;
- static thread_local const char *cached_id = NULL;
-
- _cleanup_free_ char *m = NULL;
- const char *_id = NULL, *e = NULL;
- int r;
-
- if (_likely_(cached_found >= 0)) {
-
- if (id)
- *id = cached_id;
-
- return cached_found;
- }
-
- /* /proc/vz exists in container and outside of the container,
- * /proc/bc only outside of the container. */
- if (access("/proc/vz", F_OK) >= 0 &&
- access("/proc/bc", F_OK) < 0) {
- _id = "openvz";
- r = 1;
- goto finish;
- }
-
- if (getpid() == 1) {
- /* If we are PID 1 we can just check our own
- * environment variable */
-
- e = getenv("container");
- if (isempty(e)) {
- r = 0;
- goto finish;
- }
- } else {
-
- /* Otherwise, PID 1 dropped this information into a
- * file in /run. This is better than accessing
- * /proc/1/environ, since we don't need CAP_SYS_PTRACE
- * for that. */
-
- r = read_one_line_file("/run/systemd/container", &m);
- if (r == -ENOENT) {
-
- /* Fallback for cases where PID 1 was not
- * systemd (for example, cases where
- * init=/bin/sh is used. */
-
- r = getenv_for_pid(1, "container", &m);
- if (r <= 0) {
-
- /* If that didn't work, give up,
- * assume no container manager.
- *
- * Note: This means we still cannot
- * detect containers if init=/bin/sh
- * is passed but privileges dropped,
- * as /proc/1/environ is only readable
- * with privileges. */
-
- r = 0;
- goto finish;
- }
- }
- if (r < 0)
- return r;
-
- e = m;
- }
-
- /* We only recognize a selected few here, since we want to
- * enforce a redacted namespace */
- if (streq(e, "lxc"))
- _id ="lxc";
- else if (streq(e, "lxc-libvirt"))
- _id = "lxc-libvirt";
- else if (streq(e, "systemd-nspawn"))
- _id = "systemd-nspawn";
- else if (streq(e, "docker"))
- _id = "docker";
- else
- _id = "other";
-
- r = 1;
-
-finish:
- cached_found = r;
-
- cached_id = _id;
- if (id)
- *id = _id;
-
- return r;
-}
-
-/* Returns a short identifier for the various VM/container implementations */
-int detect_virtualization(const char **id) {
- int r;
-
- r = detect_container(id);
- if (r < 0)
- return r;
- if (r > 0)
- return VIRTUALIZATION_CONTAINER;
-
- r = detect_vm(id);
- if (r < 0)
- return r;
- if (r > 0)
- return VIRTUALIZATION_VM;
-
- return VIRTUALIZATION_NONE;
-}
~ianmdlvl / elogind.git / blobdiff