260 lines
7.3 KiB
C
260 lines
7.3 KiB
C
/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
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/***
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This file is part of systemd.
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Copyright 2011 Lennart Poettering
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systemd is free software; you can redistribute it and/or modify it
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under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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systemd is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with systemd; If not, see <http://www.gnu.org/licenses/>.
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***/
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#include <string.h>
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#include <errno.h>
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#include <unistd.h>
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#include "util.h"
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#include "virt.h"
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/* Returns a short identifier for the various VM implementations */
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int detect_vm(const char **id) {
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#if defined(__i386__) || defined(__x86_64__)
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/* Both CPUID and DMI are x86 specific interfaces... */
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static const char *const dmi_vendors[] = {
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"/sys/class/dmi/id/sys_vendor",
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"/sys/class/dmi/id/board_vendor",
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"/sys/class/dmi/id/bios_vendor"
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};
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static const char dmi_vendor_table[] =
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"QEMU\0" "qemu\0"
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/* http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=1009458 */
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"VMware\0" "vmware\0"
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"VMW\0" "vmware\0"
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"Microsoft Corporation\0" "microsoft\0"
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"innotek GmbH\0" "oracle\0"
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"Xen\0" "xen\0"
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"Bochs\0" "bochs\0";
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static const char cpuid_vendor_table[] =
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"XenVMMXenVMM\0" "xen\0"
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"KVMKVMKVM\0" "kvm\0"
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/* http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=1009458 */
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"VMwareVMware\0" "vmware\0"
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/* http://msdn.microsoft.com/en-us/library/ff542428.aspx */
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"Microsoft Hv\0" "microsoft\0";
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uint32_t eax, ecx;
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union {
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uint32_t sig32[3];
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char text[13];
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} sig;
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unsigned i;
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const char *j, *k;
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bool hypervisor;
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/* http://lwn.net/Articles/301888/ */
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zero(sig);
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#if defined (__i386__)
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#define REG_a "eax"
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#define REG_b "ebx"
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#elif defined (__amd64__)
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#define REG_a "rax"
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#define REG_b "rbx"
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#endif
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/* First detect whether there is a hypervisor */
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eax = 1;
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__asm__ __volatile__ (
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/* ebx/rbx is being used for PIC! */
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" push %%"REG_b" \n\t"
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" cpuid \n\t"
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" pop %%"REG_b" \n\t"
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: "=a" (eax), "=c" (ecx)
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: "0" (eax)
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);
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hypervisor = !!(ecx & 0x80000000U);
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if (hypervisor) {
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/* There is a hypervisor, see what it is */
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eax = 0x40000000U;
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__asm__ __volatile__ (
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/* ebx/rbx is being used for PIC! */
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" push %%"REG_b" \n\t"
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" cpuid \n\t"
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" mov %%ebx, %1 \n\t"
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" pop %%"REG_b" \n\t"
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: "=a" (eax), "=r" (sig.sig32[0]), "=c" (sig.sig32[1]), "=d" (sig.sig32[2])
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: "0" (eax)
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);
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NULSTR_FOREACH_PAIR(j, k, cpuid_vendor_table)
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if (streq(sig.text, j)) {
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if (id)
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*id = k;
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return 1;
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}
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}
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for (i = 0; i < ELEMENTSOF(dmi_vendors); i++) {
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char *s;
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int r;
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const char *found = NULL;
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if ((r = read_one_line_file(dmi_vendors[i], &s)) < 0) {
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if (r != -ENOENT)
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return r;
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continue;
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}
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NULSTR_FOREACH_PAIR(j, k, dmi_vendor_table)
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if (startswith(s, j))
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found = k;
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free(s);
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if (found) {
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if (id)
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*id = found;
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return 1;
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}
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}
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if (hypervisor) {
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if (id)
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*id = "other";
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return 1;
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}
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#endif
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return 0;
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}
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int detect_container(const char **id) {
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char *e = NULL;
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int r;
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/* Unfortunately many of these operations require root access
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* in one way or another */
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r = running_in_chroot();
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if (r < 0)
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return r;
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if (r > 0) {
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if (id)
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*id = "chroot";
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return 1;
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}
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/* /proc/vz exists in container and outside of the container,
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* /proc/bc only outside of the container. */
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if (access("/proc/vz", F_OK) >= 0 &&
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access("/proc/bc", F_OK) < 0) {
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if (id)
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*id = "openvz";
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return 1;
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}
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r = getenv_for_pid(1, "container", &e);
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if (r <= 0)
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return r;
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/* We only recognize a selected few here, since we want to
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* enforce a redacted namespace */
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if (streq(e, "lxc")) {
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if (id)
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*id = "lxc";
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} else if (streq(e, "lxc-libvirt")) {
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if (id)
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*id = "lxc-libvirt";
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} else if (streq(e, "systemd-nspawn")) {
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if (id)
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*id = "systemd-nspawn";
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} else {
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if (id)
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*id = "other";
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}
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free(e);
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return r;
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}
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/* Returns a short identifier for the various VM/container implementations */
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Virtualization detect_virtualization(const char **id) {
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static __thread Virtualization cached_virt = _VIRTUALIZATION_INVALID;
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static __thread const char *cached_id = NULL;
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const char *_id;
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int r;
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Virtualization v;
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if (_likely_(cached_virt >= 0)) {
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if (id && cached_virt > 0)
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*id = cached_id;
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return cached_virt;
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}
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r = detect_container(&_id);
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if (r < 0) {
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v = r;
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goto finish;
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} else if (r > 0) {
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v = VIRTUALIZATION_CONTAINER;
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goto finish;
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}
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r = detect_vm(&_id);
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if (r < 0) {
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v = r;
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goto finish;
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} else if (r > 0) {
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v = VIRTUALIZATION_VM;
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goto finish;
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}
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v = VIRTUALIZATION_NONE;
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finish:
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if (v > 0) {
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cached_id = _id;
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if (id)
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*id = _id;
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}
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if (v >= 0)
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cached_virt = v;
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return v;
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}
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