463 lines
14 KiB
C
463 lines
14 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 <errno.h>
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#include <stdint.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 "alloc-util.h"
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#include "fileio.h"
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#include "macro.h"
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#include "process-util.h"
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#include "stat-util.h"
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#include "string-table.h"
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#include "string-util.h"
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#include "virt.h"
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static int detect_vm_cpuid(void) {
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/* CPUID is an x86 specific interface. */
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#if defined(__i386__) || defined(__x86_64__)
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static const struct {
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const char *cpuid;
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int id;
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} cpuid_vendor_table[] = {
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{ "XenVMMXenVMM", VIRTUALIZATION_XEN },
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{ "KVMKVMKVM", VIRTUALIZATION_KVM },
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/* http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=1009458 */
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{ "VMwareVMware", VIRTUALIZATION_VMWARE },
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/* http://msdn.microsoft.com/en-us/library/ff542428.aspx */
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{ "Microsoft Hv", VIRTUALIZATION_MICROSOFT },
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};
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uint32_t eax, ecx;
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bool hypervisor;
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/* http://lwn.net/Articles/301888/ */
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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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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 j;
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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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for (j = 0; j < ELEMENTSOF(cpuid_vendor_table); j ++)
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if (streq(sig.text, cpuid_vendor_table[j].cpuid))
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return cpuid_vendor_table[j].id;
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return VIRTUALIZATION_VM_OTHER;
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}
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#endif
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return VIRTUALIZATION_NONE;
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}
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static int detect_vm_device_tree(void) {
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#if defined(__arm__) || defined(__aarch64__) || defined(__powerpc__) || defined(__powerpc64__)
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_cleanup_free_ char *hvtype = NULL;
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int r;
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r = read_one_line_file("/proc/device-tree/hypervisor/compatible", &hvtype);
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if (r == -ENOENT) {
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_cleanup_closedir_ DIR *dir = NULL;
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struct dirent *dent;
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dir = opendir("/proc/device-tree");
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if (!dir) {
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if (errno == ENOENT)
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return VIRTUALIZATION_NONE;
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return -errno;
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}
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FOREACH_DIRENT(dent, dir, return -errno)
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if (strstr(dent->d_name, "fw-cfg"))
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return VIRTUALIZATION_QEMU;
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return VIRTUALIZATION_NONE;
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} else if (r < 0)
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return r;
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if (streq(hvtype, "linux,kvm"))
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return VIRTUALIZATION_KVM;
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else if (strstr(hvtype, "xen"))
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return VIRTUALIZATION_XEN;
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else
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return VIRTUALIZATION_VM_OTHER;
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#else
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return VIRTUALIZATION_NONE;
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#endif
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}
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static int detect_vm_dmi(void) {
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#if defined(__i386__) || defined(__x86_64__) || defined(__arm__) || defined(__aarch64__)
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static const char *const dmi_vendors[] = {
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"/sys/class/dmi/id/product_name", /* Test this before sys_vendor to detect KVM over QEMU */
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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 struct {
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const char *vendor;
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int id;
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} dmi_vendor_table[] = {
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{ "KVM", VIRTUALIZATION_KVM },
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{ "QEMU", VIRTUALIZATION_QEMU },
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/* http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=1009458 */
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{ "VMware", VIRTUALIZATION_VMWARE },
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{ "VMW", VIRTUALIZATION_VMWARE },
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{ "innotek GmbH", VIRTUALIZATION_ORACLE },
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{ "Xen", VIRTUALIZATION_XEN },
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{ "Bochs", VIRTUALIZATION_BOCHS },
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{ "Parallels", VIRTUALIZATION_PARALLELS },
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};
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unsigned i;
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int r;
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for (i = 0; i < ELEMENTSOF(dmi_vendors); i++) {
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_cleanup_free_ char *s = NULL;
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unsigned j;
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r = read_one_line_file(dmi_vendors[i], &s);
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if (r < 0) {
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if (r == -ENOENT)
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continue;
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return r;
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}
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for (j = 0; j < ELEMENTSOF(dmi_vendor_table); j++)
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if (startswith(s, dmi_vendor_table[j].vendor))
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return dmi_vendor_table[j].id;
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}
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#endif
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return VIRTUALIZATION_NONE;
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}
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static int detect_vm_xen(void) {
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_cleanup_free_ char *domcap = NULL;
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char *cap, *i;
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int r;
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r = read_one_line_file("/proc/xen/capabilities", &domcap);
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if (r == -ENOENT)
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return VIRTUALIZATION_NONE;
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i = domcap;
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while ((cap = strsep(&i, ",")))
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if (streq(cap, "control_d"))
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break;
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return cap ? VIRTUALIZATION_NONE : VIRTUALIZATION_XEN;
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}
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static int detect_vm_hypervisor(void) {
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_cleanup_free_ char *hvtype = NULL;
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int r;
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r = read_one_line_file("/sys/hypervisor/type", &hvtype);
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if (r == -ENOENT)
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return VIRTUALIZATION_NONE;
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if (r < 0)
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return r;
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if (streq(hvtype, "xen"))
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return VIRTUALIZATION_XEN;
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else
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return VIRTUALIZATION_VM_OTHER;
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}
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static int detect_vm_uml(void) {
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_cleanup_free_ char *cpuinfo_contents = NULL;
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int r;
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/* Detect User-Mode Linux by reading /proc/cpuinfo */
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r = read_full_file("/proc/cpuinfo", &cpuinfo_contents, NULL);
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if (r < 0)
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return r;
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if (strstr(cpuinfo_contents, "\nvendor_id\t: User Mode Linux\n"))
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return VIRTUALIZATION_UML;
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return VIRTUALIZATION_NONE;
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}
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static int detect_vm_zvm(void) {
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#if defined(__s390__)
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_cleanup_free_ char *t = NULL;
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int r;
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r = get_proc_field("/proc/sysinfo", "VM00 Control Program", WHITESPACE, &t);
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if (r == -ENOENT)
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return VIRTUALIZATION_NONE;
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if (r < 0)
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return r;
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if (streq(t, "z/VM"))
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return VIRTUALIZATION_ZVM;
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else
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return VIRTUALIZATION_KVM;
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#else
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return VIRTUALIZATION_NONE;
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#endif
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}
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/* Returns a short identifier for the various VM implementations */
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int detect_vm(void) {
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static thread_local int cached_found = _VIRTUALIZATION_INVALID;
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int r;
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if (cached_found >= 0)
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return cached_found;
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/* We have to use the correct order here:
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* Some virtualization technologies do use KVM hypervisor but are
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* expected to be detected as something else. So detect DMI first.
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*
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* An example is Virtualbox since version 5.0, which uses KVM backend.
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* Detection via DMI works corretly, the CPU ID would find KVM
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* only. */
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r = detect_vm_dmi();
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if (r < 0)
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return r;
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if (r != VIRTUALIZATION_NONE)
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goto finish;
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r = detect_vm_cpuid();
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if (r < 0)
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return r;
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if (r != VIRTUALIZATION_NONE)
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goto finish;
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/* x86 xen will most likely be detected by cpuid. If not (most likely
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* because we're not an x86 guest), then we should try the xen capabilities
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* file next. If that's not found, then we check for the high-level
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* hypervisor sysfs file:
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*
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* https://bugs.freedesktop.org/show_bug.cgi?id=77271 */
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r = detect_vm_xen();
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if (r < 0)
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return r;
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if (r != VIRTUALIZATION_NONE)
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goto finish;
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r = detect_vm_hypervisor();
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if (r < 0)
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return r;
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if (r != VIRTUALIZATION_NONE)
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goto finish;
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r = detect_vm_device_tree();
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if (r < 0)
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return r;
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if (r != VIRTUALIZATION_NONE)
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goto finish;
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r = detect_vm_uml();
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if (r < 0)
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return r;
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if (r != VIRTUALIZATION_NONE)
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goto finish;
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r = detect_vm_zvm();
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if (r < 0)
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return r;
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finish:
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cached_found = r;
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return r;
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}
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int detect_container(void) {
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static const struct {
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const char *value;
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int id;
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} value_table[] = {
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{ "lxc", VIRTUALIZATION_LXC },
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{ "lxc-libvirt", VIRTUALIZATION_LXC_LIBVIRT },
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{ "systemd-nspawn", VIRTUALIZATION_SYSTEMD_NSPAWN },
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{ "docker", VIRTUALIZATION_DOCKER },
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{ "rkt", VIRTUALIZATION_RKT },
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};
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static thread_local int cached_found = _VIRTUALIZATION_INVALID;
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_cleanup_free_ char *m = NULL;
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const char *e = NULL;
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unsigned j;
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int r;
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if (cached_found >= 0)
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return cached_found;
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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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r = VIRTUALIZATION_OPENVZ;
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goto finish;
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}
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if (getpid() == 1) {
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/* If we are PID 1 we can just check our own
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* environment variable */
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e = getenv("container");
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if (isempty(e)) {
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r = VIRTUALIZATION_NONE;
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goto finish;
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}
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} else {
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/* Otherwise, PID 1 dropped this information into a
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* file in /run. This is better than accessing
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* /proc/1/environ, since we don't need CAP_SYS_PTRACE
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* for that. */
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r = read_one_line_file("/run/systemd/container", &m);
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if (r == -ENOENT) {
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/* Fallback for cases where PID 1 was not
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* systemd (for example, cases where
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* init=/bin/sh is used. */
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r = getenv_for_pid(1, "container", &m);
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if (r <= 0) {
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/* If that didn't work, give up,
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* assume no container manager.
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*
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* Note: This means we still cannot
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* detect containers if init=/bin/sh
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* is passed but privileges dropped,
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* as /proc/1/environ is only readable
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* with privileges. */
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r = VIRTUALIZATION_NONE;
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goto finish;
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}
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}
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if (r < 0)
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return r;
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e = m;
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}
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for (j = 0; j < ELEMENTSOF(value_table); j++)
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if (streq(e, value_table[j].value)) {
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r = value_table[j].id;
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goto finish;
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}
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r = VIRTUALIZATION_CONTAINER_OTHER;
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finish:
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cached_found = r;
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return r;
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}
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int detect_virtualization(void) {
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int r;
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r = detect_container();
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if (r != 0)
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return r;
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return detect_vm();
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}
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int running_in_chroot(void) {
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int ret;
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ret = files_same("/proc/1/root", "/");
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if (ret < 0)
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return ret;
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return ret == 0;
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}
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static const char *const virtualization_table[_VIRTUALIZATION_MAX] = {
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[VIRTUALIZATION_NONE] = "none",
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[VIRTUALIZATION_KVM] = "kvm",
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[VIRTUALIZATION_QEMU] = "qemu",
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[VIRTUALIZATION_BOCHS] = "bochs",
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[VIRTUALIZATION_XEN] = "xen",
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[VIRTUALIZATION_UML] = "uml",
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[VIRTUALIZATION_VMWARE] = "vmware",
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[VIRTUALIZATION_ORACLE] = "oracle",
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[VIRTUALIZATION_MICROSOFT] = "microsoft",
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[VIRTUALIZATION_ZVM] = "zvm",
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[VIRTUALIZATION_PARALLELS] = "parallels",
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[VIRTUALIZATION_VM_OTHER] = "vm-other",
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[VIRTUALIZATION_SYSTEMD_NSPAWN] = "systemd-nspawn",
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[VIRTUALIZATION_LXC_LIBVIRT] = "lxc-libvirt",
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[VIRTUALIZATION_LXC] = "lxc",
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[VIRTUALIZATION_OPENVZ] = "openvz",
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[VIRTUALIZATION_DOCKER] = "docker",
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[VIRTUALIZATION_RKT] = "rkt",
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[VIRTUALIZATION_CONTAINER_OTHER] = "container-other",
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};
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DEFINE_STRING_TABLE_LOOKUP(virtualization, int);
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