fde32028a4
All users of the macro (except for one, in serialize.c), use the macro in connection with read_line(), so they must include fileio.h. Let's not play libc games and require multiple header file to be included for the most common use of a function. The removal of def.h includes is not exact. I mostly went over the commits that switch over to use read_line() and add def.h at the same time and reverted the addition of def.h in those files.
643 lines
21 KiB
C
643 lines
21 KiB
C
/* SPDX-License-Identifier: LGPL-2.1+ */
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#if defined(__i386__) || defined(__x86_64__)
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#include <cpuid.h>
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#endif
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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 "dirent-util.h"
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#include "env-util.h"
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#include "fd-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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{ "TCGTCGTCGTCG", 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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{ "VMwareVMware", VIRTUALIZATION_VMWARE },
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/* https://docs.microsoft.com/en-us/virtualization/hyper-v-on-windows/reference/tlfs */
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{ "Microsoft Hv", VIRTUALIZATION_MICROSOFT },
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/* https://wiki.freebsd.org/bhyve */
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{ "bhyve bhyve ", VIRTUALIZATION_BHYVE },
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{ "QNXQVMBSQG", VIRTUALIZATION_QNX },
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};
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uint32_t eax, ebx, ecx, edx;
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bool hypervisor;
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/* http://lwn.net/Articles/301888/ */
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/* First detect whether there is a hypervisor */
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if (__get_cpuid(1, &eax, &ebx, &ecx, &edx) == 0)
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return VIRTUALIZATION_NONE;
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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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__cpuid(0x40000000U, eax, ebx, ecx, edx);
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sig.sig32[0] = ebx;
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sig.sig32[1] = ecx;
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sig.sig32[2] = edx;
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log_debug("Virtualization found, CPUID=%s", sig.text);
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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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log_debug("No virtualization found in CPUID");
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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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log_debug_errno(errno, "/proc/device-tree: %m");
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return VIRTUALIZATION_NONE;
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}
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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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log_debug("Virtualization QEMU: \"fw-cfg\" present in /proc/device-tree/%s", dent->d_name);
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return VIRTUALIZATION_QEMU;
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}
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log_debug("No virtualization found in /proc/device-tree/*");
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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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log_debug("Virtualization %s found in /proc/device-tree/hypervisor/compatible", hvtype);
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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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log_debug("This platform does not support /proc/device-tree");
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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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/* https://wiki.freebsd.org/bhyve */
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{ "BHYVE", VIRTUALIZATION_BHYVE },
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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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log_debug("Virtualization %s found in DMI (%s)", s, dmi_vendors[i]);
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return dmi_vendor_table[j].id;
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}
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}
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#endif
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log_debug("No virtualization found in DMI");
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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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/* Check for Dom0 will be executed later in detect_vm_xen_dom0
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The presence of /proc/xen indicates some form of a Xen domain */
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if (access("/proc/xen", F_OK) < 0) {
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log_debug("Virtualization XEN not found, /proc/xen does not exist");
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return VIRTUALIZATION_NONE;
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}
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log_debug("Virtualization XEN found (/proc/xen exists)");
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return VIRTUALIZATION_XEN;
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}
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#define XENFEAT_dom0 11 /* xen/include/public/features.h */
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#define PATH_FEATURES "/sys/hypervisor/properties/features"
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/* Returns -errno, or 0 for domU, or 1 for dom0 */
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static int detect_vm_xen_dom0(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(PATH_FEATURES, &domcap);
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if (r < 0 && r != -ENOENT)
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return r;
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if (r == 0) {
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unsigned long features;
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/* Here, we need to use sscanf() instead of safe_atoul()
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* as the string lacks the leading "0x". */
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r = sscanf(domcap, "%lx", &features);
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if (r == 1) {
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r = !!(features & (1U << XENFEAT_dom0));
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log_debug("Virtualization XEN, found %s with value %08lx, "
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"XENFEAT_dom0 (indicating the 'hardware domain') is%s set.",
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PATH_FEATURES, features, r ? "" : " not");
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return r;
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}
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log_debug("Virtualization XEN, found %s, unhandled content '%s'",
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PATH_FEATURES, domcap);
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}
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r = read_one_line_file("/proc/xen/capabilities", &domcap);
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if (r == -ENOENT) {
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log_debug("Virtualization XEN because /proc/xen/capabilities does not exist");
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return 0;
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}
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if (r < 0)
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return r;
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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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if (!cap) {
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log_debug("Virtualization XEN DomU found (/proc/xen/capabilites)");
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return 0;
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}
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log_debug("Virtualization XEN Dom0 ignored (/proc/xen/capabilities)");
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return 1;
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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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log_debug("Virtualization %s found in /sys/hypervisor/type", hvtype);
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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_fclose_ FILE *f = NULL;
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int r;
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/* Detect User-Mode Linux by reading /proc/cpuinfo */
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f = fopen("/proc/cpuinfo", "re");
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if (!f) {
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if (errno == ENOENT) {
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log_debug("/proc/cpuinfo not found, assuming no UML virtualization.");
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return VIRTUALIZATION_NONE;
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}
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return -errno;
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}
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for (;;) {
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_cleanup_free_ char *line = NULL;
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const char *t;
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r = read_line(f, LONG_LINE_MAX, &line);
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if (r < 0)
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return r;
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if (r == 0)
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break;
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t = startswith(line, "vendor_id\t: ");
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if (t) {
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if (startswith(t, "User Mode Linux")) {
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log_debug("UML virtualization found in /proc/cpuinfo");
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return VIRTUALIZATION_UML;
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}
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break;
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}
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}
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log_debug("UML virtualization not found in /proc/cpuinfo.");
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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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log_debug("Virtualization %s found in /proc/sysinfo", t);
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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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log_debug("This platform does not support /proc/sysinfo");
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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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bool other = false;
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int r, dmi;
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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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*
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* → First, try to detect Oracle Virtualbox, even if it uses KVM, as well as Xen even if it cloaks as Microsoft
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* Hyper-V.
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*
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* → Second, try to detect from CPUID, this will report KVM for whatever software is used even if info in DMI is
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* overwritten.
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*
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* → Third, try to detect from DMI. */
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dmi = detect_vm_dmi();
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if (IN_SET(dmi, VIRTUALIZATION_ORACLE, VIRTUALIZATION_XEN)) {
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r = dmi;
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goto finish;
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}
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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_VM_OTHER)
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other = true;
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else if (r != VIRTUALIZATION_NONE)
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goto finish;
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/* Now, let's get back to DMI */
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if (dmi < 0)
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return dmi;
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if (dmi == VIRTUALIZATION_VM_OTHER)
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other = true;
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else if (dmi != VIRTUALIZATION_NONE) {
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r = dmi;
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goto finish;
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}
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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 /proc/xen
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* directory 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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r = detect_vm_xen();
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if (r < 0)
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return r;
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if (r == VIRTUALIZATION_VM_OTHER)
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other = true;
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else 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_VM_OTHER)
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other = true;
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else 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_VM_OTHER)
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other = true;
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else 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_VM_OTHER)
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other = true;
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else 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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/* x86 xen Dom0 is detected as XEN in hypervisor and maybe others.
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* In order to detect the Dom0 as not virtualization we need to
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* double-check it */
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if (r == VIRTUALIZATION_XEN) {
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int dom0;
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dom0 = detect_vm_xen_dom0();
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if (dom0 < 0)
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return dom0;
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if (dom0 > 0)
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r = VIRTUALIZATION_NONE;
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} else if (r == VIRTUALIZATION_NONE && other)
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r = VIRTUALIZATION_VM_OTHER;
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cached_found = r;
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log_debug("Found VM virtualization %s", virtualization_to_string(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, /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_cached() == 1) {
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/* If we are PID 1 we can just check our own environment variable, and that's authoritative. */
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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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goto translate_name;
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}
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/* Otherwise, PID 1 might have dropped this information into a file in /run. This is better than accessing
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* /proc/1/environ, since we don't need CAP_SYS_PTRACE for that. */
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r = read_one_line_file("/run/systemd/container", &m);
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if (r >= 0) {
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e = m;
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goto translate_name;
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}
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if (r != -ENOENT)
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return log_debug_errno(r, "Failed to read /run/systemd/container: %m");
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/* Fallback for cases where PID 1 was not systemd (for example, cases where 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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e = m;
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goto translate_name;
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}
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if (r < 0) /* This only works if we have CAP_SYS_PTRACE, hence let's better ignore failures here */
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log_debug_errno(r, "Failed to read $container of PID 1, ignoring: %m");
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/* Interestingly /proc/1/sched actually shows the host's PID for what we see as PID 1. Hence, if the PID shown
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* there is not 1, we know we are in a PID namespace. and hence a container. */
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r = read_one_line_file("/proc/1/sched", &m);
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if (r >= 0) {
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const char *t;
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t = strrchr(m, '(');
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if (!t)
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return -EIO;
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if (!startswith(t, "(1,")) {
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r = VIRTUALIZATION_CONTAINER_OTHER;
|
|
goto finish;
|
|
}
|
|
} else if (r != -ENOENT)
|
|
return r;
|
|
|
|
/* If that didn't work, give up, assume no container manager. */
|
|
r = VIRTUALIZATION_NONE;
|
|
goto finish;
|
|
|
|
translate_name:
|
|
for (j = 0; j < ELEMENTSOF(value_table); j++)
|
|
if (streq(e, value_table[j].value)) {
|
|
r = value_table[j].id;
|
|
goto finish;
|
|
}
|
|
|
|
r = VIRTUALIZATION_CONTAINER_OTHER;
|
|
|
|
finish:
|
|
log_debug("Found container virtualization %s.", virtualization_to_string(r));
|
|
cached_found = r;
|
|
return r;
|
|
}
|
|
|
|
int detect_virtualization(void) {
|
|
int r;
|
|
|
|
r = detect_container();
|
|
if (r == 0)
|
|
r = detect_vm();
|
|
|
|
return r;
|
|
}
|
|
|
|
static int userns_has_mapping(const char *name) {
|
|
_cleanup_fclose_ FILE *f = NULL;
|
|
_cleanup_free_ char *buf = NULL;
|
|
size_t n_allocated = 0;
|
|
ssize_t n;
|
|
uint32_t a, b, c;
|
|
int r;
|
|
|
|
f = fopen(name, "re");
|
|
if (!f) {
|
|
log_debug_errno(errno, "Failed to open %s: %m", name);
|
|
return errno == ENOENT ? false : -errno;
|
|
}
|
|
|
|
n = getline(&buf, &n_allocated, f);
|
|
if (n < 0) {
|
|
if (feof(f)) {
|
|
log_debug("%s is empty, we're in an uninitialized user namespace", name);
|
|
return true;
|
|
}
|
|
|
|
return log_debug_errno(errno, "Failed to read %s: %m", name);
|
|
}
|
|
|
|
r = sscanf(buf, "%"PRIu32" %"PRIu32" %"PRIu32, &a, &b, &c);
|
|
if (r < 3)
|
|
return log_debug_errno(errno, "Failed to parse %s: %m", name);
|
|
|
|
if (a == 0 && b == 0 && c == UINT32_MAX) {
|
|
/* The kernel calls mappings_overlap() and does not allow overlaps */
|
|
log_debug("%s has a full 1:1 mapping", name);
|
|
return false;
|
|
}
|
|
|
|
/* Anything else implies that we are in a user namespace */
|
|
log_debug("Mapping found in %s, we're in a user namespace", name);
|
|
return true;
|
|
}
|
|
|
|
int running_in_userns(void) {
|
|
_cleanup_free_ char *line = NULL;
|
|
int r;
|
|
|
|
r = userns_has_mapping("/proc/self/uid_map");
|
|
if (r != 0)
|
|
return r;
|
|
|
|
r = userns_has_mapping("/proc/self/gid_map");
|
|
if (r != 0)
|
|
return r;
|
|
|
|
/* "setgroups" file was added in kernel v3.18-rc6-15-g9cc46516dd. It is also
|
|
* possible to compile a kernel without CONFIG_USER_NS, in which case "setgroups"
|
|
* also does not exist. We cannot distinguish those two cases, so assume that
|
|
* we're running on a stripped-down recent kernel, rather than on an old one,
|
|
* and if the file is not found, return false.
|
|
*/
|
|
r = read_one_line_file("/proc/self/setgroups", &line);
|
|
if (r < 0) {
|
|
log_debug_errno(r, "/proc/self/setgroups: %m");
|
|
return r == -ENOENT ? false : r;
|
|
}
|
|
|
|
truncate_nl(line);
|
|
r = streq(line, "deny");
|
|
/* See user_namespaces(7) for a description of this "setgroups" contents. */
|
|
log_debug("/proc/self/setgroups contains \"%s\", %s user namespace", line, r ? "in" : "not in");
|
|
return r;
|
|
}
|
|
|
|
int running_in_chroot(void) {
|
|
int r;
|
|
|
|
if (getenv_bool("SYSTEMD_IGNORE_CHROOT") > 0)
|
|
return 0;
|
|
|
|
r = files_same("/proc/1/root", "/", 0);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
return r == 0;
|
|
}
|
|
|
|
static const char *const virtualization_table[_VIRTUALIZATION_MAX] = {
|
|
[VIRTUALIZATION_NONE] = "none",
|
|
[VIRTUALIZATION_KVM] = "kvm",
|
|
[VIRTUALIZATION_QEMU] = "qemu",
|
|
[VIRTUALIZATION_BOCHS] = "bochs",
|
|
[VIRTUALIZATION_XEN] = "xen",
|
|
[VIRTUALIZATION_UML] = "uml",
|
|
[VIRTUALIZATION_VMWARE] = "vmware",
|
|
[VIRTUALIZATION_ORACLE] = "oracle",
|
|
[VIRTUALIZATION_MICROSOFT] = "microsoft",
|
|
[VIRTUALIZATION_ZVM] = "zvm",
|
|
[VIRTUALIZATION_PARALLELS] = "parallels",
|
|
[VIRTUALIZATION_BHYVE] = "bhyve",
|
|
[VIRTUALIZATION_QNX] = "qnx",
|
|
[VIRTUALIZATION_VM_OTHER] = "vm-other",
|
|
|
|
[VIRTUALIZATION_SYSTEMD_NSPAWN] = "systemd-nspawn",
|
|
[VIRTUALIZATION_LXC_LIBVIRT] = "lxc-libvirt",
|
|
[VIRTUALIZATION_LXC] = "lxc",
|
|
[VIRTUALIZATION_OPENVZ] = "openvz",
|
|
[VIRTUALIZATION_DOCKER] = "docker",
|
|
[VIRTUALIZATION_RKT] = "rkt",
|
|
[VIRTUALIZATION_CONTAINER_OTHER] = "container-other",
|
|
};
|
|
|
|
DEFINE_STRING_TABLE_LOOKUP(virtualization, int);
|