5430f7f2bc
We finally got the OK from all contributors with non-trivial commits to relicense systemd from GPL2+ to LGPL2.1+. Some udev bits continue to be GPL2+ for now, but we are looking into relicensing them too, to allow free copy/paste of all code within systemd. The bits that used to be MIT continue to be MIT. The big benefit of the relicensing is that closed source code may now link against libsystemd-login.so and friends.
293 lines
8.4 KiB
C
293 lines
8.4 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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FILE *f;
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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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if (geteuid() != 0)
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return -EPERM;
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if (running_in_chroot() > 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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f = fopen("/proc/1/environ", "re");
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if (f) {
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bool done = false;
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do {
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char line[LINE_MAX];
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unsigned i;
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for (i = 0; i < sizeof(line)-1; i++) {
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int c;
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c = getc(f);
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if (_unlikely_(c == EOF)) {
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done = true;
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break;
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} else if (c == 0)
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break;
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line[i] = c;
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}
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line[i] = 0;
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if (streq(line, "container=lxc")) {
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fclose(f);
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if (id)
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*id = "lxc";
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return 1;
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} else if (streq(line, "container=lxc-libvirt")) {
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fclose(f);
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if (id)
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*id = "lxc-libvirt";
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return 1;
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} else if (streq(line, "container=systemd-nspawn")) {
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fclose(f);
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if (id)
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*id = "systemd-nspawn";
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return 1;
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} else if (startswith(line, "container=")) {
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fclose(f);
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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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} while (!done);
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fclose(f);
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}
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return 0;
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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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