X-Git-Url: http://git.archive.openwrt.org/?p=project%2Fprocd.git;a=blobdiff_plain;f=jail%2Fjail.c;h=9d7483c9fa4b8f37b9fbb0b65ce27aaa36173efe;hp=3b5587a9ddf77f88f5683a68e1f6196b9eeb2977;hb=cdc3dab3cd5d0295f638de3088bc4f5c9669e7c2;hpb=74d835463e05e5761f6f5271e487f299f29d3f07

diff --git a/jail/jail.c b/jail/jail.c
index 3b5587a..9d7483c 100644
--- a/jail/jail.c
+++ b/jail/jail.c
@@ -12,48 +12,44 @@
  */
 
 #define _GNU_SOURCE
-#include <sys/syscall.h>
-#include <sys/mman.h>
-#include <sys/utsname.h>
-#include <sys/types.h>
-#include <sys/syscall.h>
-#include <sys/types.h>
 #include <sys/mount.h>
 #include <sys/prctl.h>
 #include <sys/wait.h>
 
 #include <stdlib.h>
 #include <unistd.h>
-#include <values.h>
 #include <errno.h>
-#include <stdio.h>
 #include <string.h>
 #include <sys/stat.h>
 #include <fcntl.h>
-#include <syslog.h>
 #include <libgen.h>
-#include <glob.h>
-#include <elf.h>
 #include <sched.h>
+#include <linux/limits.h>
+#include <signal.h>
 
+#include "capabilities.h"
 #include "elf.h"
+#include "fs.h"
+#include "jail.h"
+#include "log.h"
 
-#include <libubox/utils.h>
-#include <libubox/list.h>
 #include <libubox/uloop.h>
 
 #define STACK_SIZE	(1024 * 1024)
-#define OPT_ARGS	"P:S:n:r:w:psuldo"
-
-struct extra {
-	struct list_head list;
-
-	const char *path;
-	const char *name;
-	int readonly;
-};
-
-static LIST_HEAD(extras);
+#define OPT_ARGS	"S:C:n:h:r:w:d:psuloc"
+
+static struct {
+	char *name;
+	char *hostname;
+	char **jail_argv;
+	char *seccomp;
+	char *capabilities;
+	int no_new_privs;
+	int namespace;
+	int procfs;
+	int ronly;
+	int sysfs;
+} opts;
 
 extern int pivot_root(const char *new_root, const char *put_old);
 
@@ -81,140 +77,120 @@ static int mkdir_p(char *dir, mode_t mask)
 		return 0;
 
 	if (ret)
-		ERROR("mkdir failed on %s: %s\n", dir, strerror(errno));
+		ERROR("mkdir(%s, %d) failed: %s\n", dir, mask, strerror(errno));
 
 	return ret;
 }
 
-static int mount_bind(const char *root, const char *path, const char *name, int readonly, int error)
+int mount_bind(const char *root, const char *path, int readonly, int error)
 {
-	const char *p = path;
 	struct stat s;
-	char old[256];
-	char new[256];
+	char new[PATH_MAX];
 	int fd;
 
-	if (strstr(p, "local"))
-		p = "/lib";
-
-	snprintf(old, sizeof(old), "%s/%s", path, name);
-	snprintf(new, sizeof(new), "%s%s", root, p);
-
-	mkdir_p(new, 0755);
-
-	snprintf(new, sizeof(new), "%s%s/%s", root, p, name);
-
-	if (stat(old, &s)) {
-		ERROR("%s does not exist\n", old);
+	if (stat(path, &s)) {
+		ERROR("stat(%s) failed: %s\n", path, strerror(errno));
 		return error;
 	}
 
+	snprintf(new, sizeof(new), "%s%s", root, path);
 	if (S_ISDIR(s.st_mode)) {
 		mkdir_p(new, 0755);
 	} else {
+		mkdir_p(dirname(new), 0755);
+		snprintf(new, sizeof(new), "%s%s", root, path);
 		fd = creat(new, 0644);
 		if (fd == -1) {
-			ERROR("failed to create %s: %s\n", new, strerror(errno));
+			ERROR("creat(%s) failed: %s\n", new, strerror(errno));
 			return -1;
 		}
 		close(fd);
 	}
 
-	if (mount(old, new, NULL, MS_BIND, NULL)) {
-		ERROR("failed to mount -B %s %s: %s\n", old, new, strerror(errno));
+	if (mount(path, new, NULL, MS_BIND, NULL)) {
+		ERROR("failed to mount -B %s %s: %s\n", path, new, strerror(errno));
 		return -1;
 	}
 
-	if (readonly && mount(old, new, NULL, MS_BIND | MS_REMOUNT | MS_RDONLY, NULL)) {
+	if (readonly && mount(NULL, new, NULL, MS_BIND | MS_REMOUNT | MS_RDONLY, NULL)) {
 		ERROR("failed to remount ro %s: %s\n", new, strerror(errno));
 		return -1;
 	}
 
-	DEBUG("mount -B %s %s\n", old, new);
+	DEBUG("mount -B %s %s (%s)\n", path, new, readonly?"ro":"rw");
 
 	return 0;
 }
 
-static int build_jail(const char *path)
+static int build_jail_fs(void)
 {
-	struct library *l;
-	struct extra *m;
-	int ret = 0;
+	char jail_root[] = "/tmp/ujail-XXXXXX";
+	if (mkdtemp(jail_root) == NULL) {
+		ERROR("mkdtemp(%s) failed: %s\n", jail_root, strerror(errno));
+		return -1;
+	}
 
-	mkdir(path, 0755);
+	/* oldroot can't be MS_SHARED else pivot_root() fails */
+	if (mount("none", "/", NULL, MS_REC|MS_PRIVATE, NULL)) {
+		ERROR("private mount failed %s\n", strerror(errno));
+		return -1;
+	}
 
-	if (mount("tmpfs", path, "tmpfs", MS_NOATIME, "mode=0744")) {
+	if (mount("tmpfs", jail_root, "tmpfs", MS_NOATIME, "mode=0755")) {
 		ERROR("tmpfs mount failed %s\n", strerror(errno));
 		return -1;
 	}
 
-	avl_for_each_element(&libraries, l, avl)
-		if (mount_bind(path, l->path, l->name, 1, -1))
-			return -1;
-
-	list_for_each_entry(m, &extras, list)
-		if (mount_bind(path, m->path, m->name, m->readonly, 0))
-			return -1;
-
-	return ret;
-}
-
-static void _umount(const char *root, const char *path)
-{
-	char *buf = NULL;
-
-	if (asprintf(&buf, "%s%s", root, path) < 0) {
-		ERROR("failed to alloc umount buffer: %s\n", strerror(errno));
-	} else {
-		DEBUG("umount %s\n", buf);
-		umount(buf);
-		free(buf);
+	if (chdir(jail_root)) {
+		ERROR("chdir(%s) (jail_root) failed: %s\n", jail_root, strerror(errno));
+		return -1;
 	}
-}
-
-static int stop_jail(const char *root)
-{
-	struct library *l;
-	struct extra *m;
-
-	avl_for_each_element(&libraries, l, avl) {
-		char path[256];
-		char *p = l->path;
 
-		if (strstr(p, "local"))
-			p = "/lib";
-
-		snprintf(path, sizeof(path), "%s%s/%s", root, p, l->name);
-		DEBUG("umount %s\n", path);
-		umount(path);
+	if (mount_all(jail_root)) {
+		ERROR("mount_all() failed\n");
+		return -1;
 	}
 
-	list_for_each_entry(m, &extras, list) {
-		char path[256];
+	char dirbuf[sizeof(jail_root) + 4];
+	snprintf(dirbuf, sizeof(dirbuf), "%s/old", jail_root);
+	mkdir(dirbuf, 0755);
 
-		snprintf(path, sizeof(path), "%s%s/%s", root, m->path, m->name);
-		DEBUG("umount %s\n", path);
-		umount(path);
+	if (pivot_root(jail_root, dirbuf) == -1) {
+		ERROR("pivot_root(%s, %s) failed: %s\n", jail_root, dirbuf, strerror(errno));
+		return -1;
+	}
+	if (chdir("/")) {
+		ERROR("chdir(/) (after pivot_root) failed: %s\n", strerror(errno));
+		return -1;
 	}
 
-	_umount(root, "/proc");
-	_umount(root, "/sys");
+	snprintf(dirbuf, sizeof(dirbuf), "/old%s", jail_root);
+	rmdir(dirbuf);
+	umount2("/old", MNT_DETACH);
+	rmdir("/old");
 
-	DEBUG("umount %s\n", root);
-	umount(root);
-	rmdir(root);
+	if (opts.procfs) {
+		mkdir("/proc", 0755);
+		mount("proc", "/proc", "proc", MS_NOATIME | MS_NODEV | MS_NOEXEC | MS_NOSUID, 0);
+	}
+	if (opts.sysfs) {
+		mkdir("/sys", 0755);
+		mount("sysfs", "/sys", "sysfs", MS_NOATIME | MS_NODEV | MS_NOEXEC | MS_NOSUID, 0);
+	}
+	if (opts.ronly)
+		mount(NULL, "/", NULL, MS_RDONLY | MS_REMOUNT, 0);
 
 	return 0;
 }
 
 #define MAX_ENVP	8
-static char** build_envp(const char *seccomp, int debug)
+static char** build_envp(const char *seccomp)
 {
 	static char *envp[MAX_ENVP];
-	static char preload_var[64];
-	static char seccomp_var[64];
+	static char preload_var[PATH_MAX];
+	static char seccomp_var[PATH_MAX];
 	static char debug_var[] = "LD_DEBUG=all";
-	char *preload_lib = find_lib("libpreload-seccomp.so");
+	const char *preload_lib = find_lib("libpreload-seccomp.so");
 	int count = 0;
 
 	if (seccomp && !preload_lib) {
@@ -227,271 +203,253 @@ static char** build_envp(const char *seccomp, int debug)
 		snprintf(preload_var, sizeof(preload_var), "LD_PRELOAD=%s", preload_lib);
 		envp[count++] = preload_var;
 	}
-	if (debug)
+	if (debug > 1)
 		envp[count++] = debug_var;
 
 	return envp;
 }
 
-static int spawn(const char *path, char **argv, const char *seccomp)
-{
-	pid_t pid = fork();
-
-	if (pid < 0) {
-		ERROR("failed to spawn %s: %s\n", *argv, strerror(errno));
-		return -1;
-	} else if (!pid) {
-		char **envp = build_envp(seccomp, 0);
-
-		INFO("spawning %s\n", *argv);
-		execve(*argv, argv, envp);
-		ERROR("failed to spawn child %s: %s\n", *argv, strerror(errno));
-		exit(-1);
-	}
-
-	return pid;
-}
-
-static int usage(void)
+static void usage(void)
 {
-	fprintf(stderr, "jail <options> -D <binary> <params ...>\n");
-	fprintf(stderr, "  -P <path>\tpath where the jail will be staged\n");
-	fprintf(stderr, "  -S <file>\tseccomp filter\n");
+	fprintf(stderr, "ujail <options> -- <binary> <params ...>\n");
+	fprintf(stderr, "  -d <num>\tshow debug log (increase num to increase verbosity)\n");
+	fprintf(stderr, "  -S <file>\tseccomp filter config\n");
+	fprintf(stderr, "  -C <file>\tcapabilities drop config\n");
+	fprintf(stderr, "  -c\t\tset PR_SET_NO_NEW_PRIVS\n");
 	fprintf(stderr, "  -n <name>\tthe name of the jail\n");
+	fprintf(stderr, "namespace jail options:\n");
+	fprintf(stderr, "  -h <hostname>\tchange the hostname of the jail\n");
 	fprintf(stderr, "  -r <file>\treadonly files that should be staged\n");
 	fprintf(stderr, "  -w <file>\twriteable files that should be staged\n");
-	fprintf(stderr, "  -p\t\tjail has /proc\t\n");
-	fprintf(stderr, "  -s\t\tjail has /sys\t\n");
-	fprintf(stderr, "  -l\t\tjail has /dev/log\t\n");
-	fprintf(stderr, "  -u\t\tjail has a ubus socket\t\n");
-
-	return -1;
+	fprintf(stderr, "  -p\t\tjail has /proc\n");
+	fprintf(stderr, "  -s\t\tjail has /sys\n");
+	fprintf(stderr, "  -l\t\tjail has /dev/log\n");
+	fprintf(stderr, "  -u\t\tjail has a ubus socket\n");
+	fprintf(stderr, "  -o\t\tremont jail root (/) read only\n");
+	fprintf(stderr, "\nWarning: by default root inside the jail is the same\n\
+and he has the same powers as root outside the jail,\n\
+thus he can escape the jail and/or break stuff.\n\
+Please use seccomp/capabilities (-S/-C) to restrict his powers\n\n\
+If you use none of the namespace jail options,\n\
+ujail will not use namespace/build a jail,\n\
+and will only drop capabilities/apply seccomp filter.\n\n");
 }
 
-static int child_running = 1;
-
-static void child_process_handler(struct uloop_process *c, int ret)
+static int exec_jail(void *_notused)
 {
-	INFO("child (%d) exited: %d\n", c->pid, ret);
-	uloop_end();
-	child_running = 0;
-}
-
-struct uloop_process child_process = {
-	.cb = child_process_handler,
-};
+	if (opts.capabilities && drop_capabilities(opts.capabilities))
+		exit(EXIT_FAILURE);
 
-static int spawn_child(void *arg)
-{
-	char *path = get_current_dir_name();
-	int procfs = 0, sysfs = 0;
-	char *seccomp = NULL;
-	char **argv = arg;
-	int argc = 0, ch;
-	char *mpoint;
-	int ronly = 0;
-
-	while (argv[argc])
-		argc++;
-
-	optind = 0;
-	while ((ch = getopt(argc, argv, OPT_ARGS)) != -1) {
-		switch (ch) {
-		case 'd':
-			debug = 1;
-			break;
-		case 'S':
-			seccomp = optarg;
-			break;
-		case 'p':
-			procfs = 1;
-			break;
-		case 'o':
-			ronly = 1;
-			break;
-		case 's':
-			sysfs = 1;
-			break;
-		case 'n':
-			sethostname(optarg, strlen(optarg));
-			break;
-		}
+	if (opts.no_new_privs && prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0)) {
+                ERROR("prctl(PR_SET_NO_NEW_PRIVS) failed: %s\n", strerror(errno));
+		exit(EXIT_FAILURE);
 	}
 
-	asprintf(&mpoint, "%s/old", path);
-	mkdir_p(mpoint, 0755);
-	if (pivot_root(path, mpoint) == -1) {
-		ERROR("pivot_root failed:%s\n", strerror(errno));
-		return -1;
-	}
-	free(mpoint);
-	umount2("/old", MNT_DETACH);
-	rmdir("/old");
-	if (procfs) {
-		mkdir("/proc", 0755);
-		mount("proc", "/proc", "proc", MS_NOATIME, 0);
-	}
-	if (sysfs) {
-		mkdir("/sys", 0755);
-		mount("sysfs", "/sys", "sysfs", MS_NOATIME, 0);
+	if (opts.namespace && opts.hostname && strlen(opts.hostname) > 0
+			&& sethostname(opts.hostname, strlen(opts.hostname))) {
+		ERROR("sethostname(%s) failed: %s\n", opts.hostname, strerror(errno));
+		exit(EXIT_FAILURE);
 	}
-	if (ronly)
-		mount(NULL, "/", NULL, MS_RDONLY | MS_REMOUNT, 0);
 
-	uloop_init();
-
-	child_process.pid = spawn(path, &argv[optind], seccomp);
-	uloop_process_add(&child_process);
-	uloop_run();
-	uloop_done();
-	if (child_running) {
-		kill(child_process.pid, SIGTERM);
-		waitpid(child_process.pid, NULL, 0);
+	if (opts.namespace && build_jail_fs()) {
+		ERROR("failed to build jail fs\n");
+		exit(EXIT_FAILURE);
 	}
 
-	return 0;
+	char **envp = build_envp(opts.seccomp);
+	if (!envp)
+		exit(EXIT_FAILURE);
+
+	INFO("exec-ing %s\n", *opts.jail_argv);
+	execve(*opts.jail_argv, opts.jail_argv, envp);
+	/* we get there only if execve fails */
+	ERROR("failed to execve %s: %s\n", *opts.jail_argv, strerror(errno));
+	exit(EXIT_FAILURE);
 }
 
-static int namespace_running = 1;
+static int jail_running = 1;
+static int jail_return_code = 0;
 
-static void namespace_process_handler(struct uloop_process *c, int ret)
+static void jail_process_timeout_cb(struct uloop_timeout *t);
+static struct uloop_timeout jail_process_timeout = {
+	.cb = jail_process_timeout_cb,
+};
+
+static void jail_process_handler(struct uloop_process *c, int ret)
 {
-	INFO("namespace (%d) exited: %d\n", c->pid, ret);
+	uloop_timeout_cancel(&jail_process_timeout);
+	if (WIFEXITED(ret)) {
+		jail_return_code = WEXITSTATUS(ret);
+		INFO("jail (%d) exited with exit: %d\n", c->pid, jail_return_code);
+	} else {
+		jail_return_code = WTERMSIG(ret);
+		INFO("jail (%d) exited with signal: %d\n", c->pid, jail_return_code);
+	}
+	jail_running = 0;
 	uloop_end();
-	namespace_running = 0;
 }
 
-struct uloop_process namespace_process = {
-	.cb = namespace_process_handler,
+static struct uloop_process jail_process = {
+	.cb = jail_process_handler,
 };
 
-static void spawn_namespace(const char *path, int argc, char **argv)
+static void jail_process_timeout_cb(struct uloop_timeout *t)
 {
-	char *dir = get_current_dir_name();
-
-	uloop_init();
-	chdir(path);
-	namespace_process.pid = clone(spawn_child,
-			child_stack + STACK_SIZE,
-			CLONE_NEWUTS | CLONE_NEWPID | CLONE_NEWNS | SIGCHLD, argv);
-
-	if (namespace_process.pid != -1) {
-		chdir(dir);
-		free(dir);
-		uloop_process_add(&namespace_process);
-		uloop_run();
-		uloop_done();
-		if (namespace_running) {
-			kill(namespace_process.pid, SIGTERM);
-			waitpid(namespace_process.pid, NULL, 0);
-		}
-	} else {
-		ERROR("failed to spawn namespace: %s\n", strerror(errno));
-	}
+	DEBUG("jail process failed to stop, sending SIGKILL\n");
+	kill(jail_process.pid, SIGKILL);
 }
 
-static void add_extra(char *name, int readonly)
+static void jail_handle_signal(int signo)
 {
-	struct extra *f;
-
-	if (*name != '/') {
-		ERROR("%s is not an absolute path\n", name);
-		return;
-	}
-
-	f = calloc(1, sizeof(struct extra));
-
-	f->name = basename(name);
-	f->path = dirname(strdup(name));
-	f->readonly = readonly;
-
-	list_add_tail(&f->list, &extras);
+	DEBUG("forwarding signal %d to the jailed process\n", signo);
+	kill(jail_process.pid, signo);
 }
 
 int main(int argc, char **argv)
 {
+	sigset_t sigmask;
 	uid_t uid = getuid();
-	const char *name = NULL;
-	char *path = NULL;
-	struct stat s;
-	int ch, ret;
 	char log[] = "/dev/log";
 	char ubus[] = "/var/run/ubus.sock";
+	int ch, i;
 
 	if (uid) {
 		ERROR("not root, aborting: %s\n", strerror(errno));
-		return -1;
+		return EXIT_FAILURE;
 	}
 
 	umask(022);
+	mount_list_init();
+	init_library_search();
 
 	while ((ch = getopt(argc, argv, OPT_ARGS)) != -1) {
 		switch (ch) {
 		case 'd':
-			debug = 1;
+			debug = atoi(optarg);
 			break;
-		case 'P':
-			path = optarg;
+		case 'p':
+			opts.namespace = 1;
+			opts.procfs = 1;
 			break;
-		case 'n':
-			name = optarg;
+		case 'o':
+			opts.namespace = 1;
+			opts.ronly = 1;
+			break;
+		case 's':
+			opts.namespace = 1;
+			opts.sysfs = 1;
 			break;
 		case 'S':
+			opts.seccomp = optarg;
+			add_mount(optarg, 1, -1);
+			break;
+		case 'C':
+			opts.capabilities = optarg;
+			break;
+		case 'c':
+			opts.no_new_privs = 1;
+			break;
+		case 'n':
+			opts.name = optarg;
+			break;
+		case 'h':
+			opts.hostname = optarg;
+			break;
 		case 'r':
-			add_extra(optarg, 1);
+			opts.namespace = 1;
+			add_path_and_deps(optarg, 1, 0, 0);
 			break;
 		case 'w':
-			add_extra(optarg, 0);
+			opts.namespace = 1;
+			add_path_and_deps(optarg, 0, 0, 0);
 			break;
 		case 'u':
-			add_extra(ubus, 0);
+			opts.namespace = 1;
+			add_mount(ubus, 0, -1);
 			break;
 		case 'l':
-			add_extra(log, 0);
+			opts.namespace = 1;
+			add_mount(log, 0, -1);
 			break;
 		}
 	}
 
-	if (argc - optind < 1)
-		return usage();
-
-	if (!path && asprintf(&path, "/tmp/%s", basename(argv[optind])) == -1) {
-		ERROR("failed to set root path\n: %s", strerror(errno));
-		return -1;
+	/* no <binary> param found */
+	if (argc - optind < 1) {
+		usage();
+		return EXIT_FAILURE;
 	}
-
-	if (!stat(path, &s)) {
-		ERROR("%s already exists: %s\n", path, strerror(errno));
-		return -1;
+	if (!(opts.namespace||opts.capabilities||opts.seccomp)) {
+		ERROR("Not using namespaces, capabilities or seccomp !!!\n\n");
+		usage();
+		return EXIT_FAILURE;
 	}
+	DEBUG("Using namespaces(%d), capabilities(%d), seccomp(%d)\n",
+		opts.namespace,
+		opts.capabilities != 0,
+		opts.seccomp != 0);
 
-	if (name)
-		prctl(PR_SET_NAME, name, NULL, NULL, NULL);
-
-	avl_init(&libraries, avl_strcmp, false, NULL);
-	alloc_library_path("/lib64");
-	alloc_library_path("/lib");
-	alloc_library_path("/usr/lib");
-	load_ldso_conf("/etc/ld.so.conf");
+	opts.jail_argv = &argv[optind];
 
-	if (elf_load_deps(argv[optind])) {
+	if (opts.namespace && add_path_and_deps(*opts.jail_argv, 1, -1, 0)) {
 		ERROR("failed to load dependencies\n");
 		return -1;
 	}
 
-	if (elf_load_deps("libpreload-seccomp.so")) {
+	if (opts.namespace && opts.seccomp && add_path_and_deps("libpreload-seccomp.so", 1, -1, 1)) {
 		ERROR("failed to load libpreload-seccomp.so\n");
 		return -1;
 	}
 
-	ret = build_jail(path);
+	if (opts.name)
+		prctl(PR_SET_NAME, opts.name, NULL, NULL, NULL);
 
-	if (!ret)
-		spawn_namespace(path, argc, argv);
-	else
-		ERROR("failed to build jail\n");
+	uloop_init();
 
-	stop_jail(path);
+	sigfillset(&sigmask);
+	for (i = 0; i < _NSIG; i++) {
+		struct sigaction s = { 0 };
 
-	return ret;
+		if (!sigismember(&sigmask, i))
+			continue;
+		if ((i == SIGCHLD) || (i == SIGPIPE))
+			continue;
+
+		s.sa_handler = jail_handle_signal;
+		sigaction(i, &s, NULL);
+	}
+
+	if (opts.namespace) {
+		add_mount("/dev/full", 0, -1);
+		add_mount("/dev/null", 0, -1);
+		add_mount("/dev/urandom", 0, -1);
+		add_mount("/dev/zero", 0, -1);
+
+		int flags = CLONE_NEWPID | CLONE_NEWNS | CLONE_NEWIPC | SIGCHLD;
+		if (opts.hostname)
+			flags |= CLONE_NEWUTS;
+		jail_process.pid = clone(exec_jail, child_stack + STACK_SIZE, flags, NULL);
+	} else {
+		jail_process.pid = fork();
+	}
+
+	if (jail_process.pid > 0) {
+		/* parent process */
+		uloop_process_add(&jail_process);
+		uloop_run();
+		if (jail_running) {
+			DEBUG("uloop interrupted, killing jail process\n");
+			kill(jail_process.pid, SIGTERM);
+			uloop_timeout_set(&jail_process_timeout, 1000);
+			uloop_run();
+		}
+		uloop_done();
+		return jail_return_code;
+	} else if (jail_process.pid == 0) {
+		/* fork child process */
+		return exec_jail(NULL);
+	} else {
+		ERROR("failed to clone/fork: %s\n", strerror(errno));
+		return EXIT_FAILURE;
+	}
 }