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-rw-r--r--src/detect-virt/detect-virt.c176
1 files changed, 176 insertions, 0 deletions
diff --git a/src/detect-virt/detect-virt.c b/src/detect-virt/detect-virt.c
new file mode 100644
index 0000000..af2a58b
--- /dev/null
+++ b/src/detect-virt/detect-virt.c
@@ -0,0 +1,176 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+
+#include <errno.h>
+#include <getopt.h>
+#include <stdbool.h>
+#include <stdlib.h>
+
+#include "alloc-util.h"
+#include "main-func.h"
+#include "pretty-print.h"
+#include "string-table.h"
+#include "util.h"
+#include "virt.h"
+
+static bool arg_quiet = false;
+static enum {
+ ANY_VIRTUALIZATION,
+ ONLY_VM,
+ ONLY_CONTAINER,
+ ONLY_CHROOT,
+ ONLY_PRIVATE_USERS,
+} arg_mode = ANY_VIRTUALIZATION;
+
+static int help(void) {
+ _cleanup_free_ char *link = NULL;
+ int r;
+
+ r = terminal_urlify_man("systemd-detect-virt", "1", &link);
+ if (r < 0)
+ return log_oom();
+
+ printf("%s [OPTIONS...]\n\n"
+ "Detect execution in a virtualized environment.\n\n"
+ " -h --help Show this help\n"
+ " --version Show package version\n"
+ " -c --container Only detect whether we are run in a container\n"
+ " -v --vm Only detect whether we are run in a VM\n"
+ " -r --chroot Detect whether we are run in a chroot() environment\n"
+ " --private-users Only detect whether we are running in a user namespace\n"
+ " -q --quiet Don't output anything, just set return value\n"
+ " --list List all known and detectable types of virtualization\n"
+ "\nSee the %s for details.\n",
+ program_invocation_short_name,
+ link);
+
+ return 0;
+}
+
+static int parse_argv(int argc, char *argv[]) {
+
+ enum {
+ ARG_VERSION = 0x100,
+ ARG_PRIVATE_USERS,
+ ARG_LIST,
+ };
+
+ static const struct option options[] = {
+ { "help", no_argument, NULL, 'h' },
+ { "version", no_argument, NULL, ARG_VERSION },
+ { "container", no_argument, NULL, 'c' },
+ { "vm", no_argument, NULL, 'v' },
+ { "chroot", no_argument, NULL, 'r' },
+ { "private-users", no_argument, NULL, ARG_PRIVATE_USERS },
+ { "quiet", no_argument, NULL, 'q' },
+ { "list", no_argument, NULL, ARG_LIST },
+ {}
+ };
+
+ int c;
+
+ assert(argc >= 0);
+ assert(argv);
+
+ while ((c = getopt_long(argc, argv, "hqcvr", options, NULL)) >= 0)
+
+ switch (c) {
+
+ case 'h':
+ return help();
+
+ case ARG_VERSION:
+ return version();
+
+ case 'q':
+ arg_quiet = true;
+ break;
+
+ case 'c':
+ arg_mode = ONLY_CONTAINER;
+ break;
+
+ case ARG_PRIVATE_USERS:
+ arg_mode = ONLY_PRIVATE_USERS;
+ break;
+
+ case 'v':
+ arg_mode = ONLY_VM;
+ break;
+
+ case 'r':
+ arg_mode = ONLY_CHROOT;
+ break;
+
+ case ARG_LIST:
+ DUMP_STRING_TABLE(virtualization, Virtualization, _VIRTUALIZATION_MAX);
+ return 0;
+
+ case '?':
+ return -EINVAL;
+
+ default:
+ assert_not_reached();
+ }
+
+ if (optind < argc)
+ return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
+ "%s takes no arguments.",
+ program_invocation_short_name);
+
+ return 1;
+}
+
+static int run(int argc, char *argv[]) {
+ Virtualization v;
+ int r;
+
+ /* This is mostly intended to be used for scripts which want
+ * to detect whether we are being run in a virtualized
+ * environment or not */
+
+ log_setup();
+
+ r = parse_argv(argc, argv);
+ if (r <= 0)
+ return r;
+
+ switch (arg_mode) {
+ case ONLY_VM:
+ v = detect_vm();
+ if (v < 0)
+ return log_error_errno(v, "Failed to check for VM: %m");
+ break;
+
+ case ONLY_CONTAINER:
+ v = detect_container();
+ if (v < 0)
+ return log_error_errno(v, "Failed to check for container: %m");
+ break;
+
+ case ONLY_CHROOT:
+ r = running_in_chroot();
+ if (r < 0)
+ return log_error_errno(r, "Failed to check for chroot() environment: %m");
+ return !r;
+
+ case ONLY_PRIVATE_USERS:
+ r = running_in_userns();
+ if (r < 0)
+ return log_error_errno(r, "Failed to check for user namespace: %m");
+ return !r;
+
+ case ANY_VIRTUALIZATION:
+ default:
+ v = detect_virtualization();
+ if (v < 0)
+ return log_error_errno(v, "Failed to check for virtualization: %m");
+ break;
+ }
+
+ if (!arg_quiet)
+ puts(virtualization_to_string(v));
+
+ return v == VIRTUALIZATION_NONE;
+}
+
+DEFINE_MAIN_FUNCTION_WITH_POSITIVE_FAILURE(run);