4093 lines
148 KiB
C
4093 lines
148 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 2010 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 <signal.h>
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#include <sched.h>
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#include <unistd.h>
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#include <sys/types.h>
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#include <sys/syscall.h>
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#include <sys/mount.h>
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#include <sys/wait.h>
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#include <stdlib.h>
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#include <string.h>
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#include <stdio.h>
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#include <errno.h>
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#include <sys/prctl.h>
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#include <getopt.h>
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#include <termios.h>
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#include <sys/signalfd.h>
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#include <grp.h>
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#include <linux/fs.h>
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#include <sys/un.h>
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#include <sys/socket.h>
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#include <linux/netlink.h>
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#include <net/if.h>
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#include <linux/veth.h>
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#include <sys/personality.h>
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#include <linux/loop.h>
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#ifdef HAVE_SELINUX
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#include <selinux/selinux.h>
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#endif
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#ifdef HAVE_SECCOMP
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#include <seccomp.h>
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#endif
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#ifdef HAVE_BLKID
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#include <blkid/blkid.h>
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#endif
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#include "sd-daemon.h"
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#include "sd-bus.h"
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#include "sd-id128.h"
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#include "sd-rtnl.h"
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#include "log.h"
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#include "util.h"
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#include "mkdir.h"
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#include "macro.h"
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#include "audit.h"
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#include "missing.h"
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#include "cgroup-util.h"
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#include "strv.h"
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#include "path-util.h"
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#include "loopback-setup.h"
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#include "dev-setup.h"
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#include "fdset.h"
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#include "build.h"
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#include "fileio.h"
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#include "bus-util.h"
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#include "bus-error.h"
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#include "ptyfwd.h"
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#include "bus-kernel.h"
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#include "env-util.h"
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#include "def.h"
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#include "rtnl-util.h"
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#include "udev-util.h"
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#include "blkid-util.h"
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#include "gpt.h"
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#include "siphash24.h"
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#include "copy.h"
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#include "base-filesystem.h"
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#include "barrier.h"
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#include "event-util.h"
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#include "capability.h"
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#include "cap-list.h"
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#include "btrfs-util.h"
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#include "machine-image.h"
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#include "list.h"
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#include "in-addr-util.h"
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#include "fw-util.h"
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#include "local-addresses.h"
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#ifdef HAVE_SECCOMP
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#include "seccomp-util.h"
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#endif
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typedef struct ExposePort {
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int protocol;
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uint16_t host_port;
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uint16_t container_port;
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LIST_FIELDS(struct ExposePort, ports);
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} ExposePort;
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typedef enum ContainerStatus {
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CONTAINER_TERMINATED,
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CONTAINER_REBOOTED
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} ContainerStatus;
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typedef enum LinkJournal {
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LINK_NO,
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LINK_AUTO,
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LINK_HOST,
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LINK_GUEST
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} LinkJournal;
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typedef enum Volatile {
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VOLATILE_NO,
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VOLATILE_YES,
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VOLATILE_STATE,
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} Volatile;
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static char *arg_directory = NULL;
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static char *arg_template = NULL;
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static char *arg_user = NULL;
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static sd_id128_t arg_uuid = {};
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static char *arg_machine = NULL;
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static const char *arg_selinux_context = NULL;
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static const char *arg_selinux_apifs_context = NULL;
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static const char *arg_slice = NULL;
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static bool arg_private_network = false;
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static bool arg_read_only = false;
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static bool arg_boot = false;
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static bool arg_ephemeral = false;
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static LinkJournal arg_link_journal = LINK_AUTO;
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static bool arg_link_journal_try = false;
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static uint64_t arg_retain =
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(1ULL << CAP_CHOWN) |
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(1ULL << CAP_DAC_OVERRIDE) |
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(1ULL << CAP_DAC_READ_SEARCH) |
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(1ULL << CAP_FOWNER) |
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(1ULL << CAP_FSETID) |
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(1ULL << CAP_IPC_OWNER) |
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(1ULL << CAP_KILL) |
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(1ULL << CAP_LEASE) |
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(1ULL << CAP_LINUX_IMMUTABLE) |
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(1ULL << CAP_NET_BIND_SERVICE) |
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(1ULL << CAP_NET_BROADCAST) |
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(1ULL << CAP_NET_RAW) |
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(1ULL << CAP_SETGID) |
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(1ULL << CAP_SETFCAP) |
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(1ULL << CAP_SETPCAP) |
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(1ULL << CAP_SETUID) |
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(1ULL << CAP_SYS_ADMIN) |
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(1ULL << CAP_SYS_CHROOT) |
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(1ULL << CAP_SYS_NICE) |
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(1ULL << CAP_SYS_PTRACE) |
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(1ULL << CAP_SYS_TTY_CONFIG) |
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(1ULL << CAP_SYS_RESOURCE) |
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(1ULL << CAP_SYS_BOOT) |
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(1ULL << CAP_AUDIT_WRITE) |
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(1ULL << CAP_AUDIT_CONTROL) |
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(1ULL << CAP_MKNOD);
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static char **arg_bind = NULL;
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static char **arg_bind_ro = NULL;
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static char **arg_tmpfs = NULL;
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static char **arg_setenv = NULL;
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static bool arg_quiet = false;
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static bool arg_share_system = false;
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static bool arg_register = true;
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static bool arg_keep_unit = false;
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static char **arg_network_interfaces = NULL;
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static char **arg_network_macvlan = NULL;
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static bool arg_network_veth = false;
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static const char *arg_network_bridge = NULL;
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static unsigned long arg_personality = 0xffffffffLU;
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static char *arg_image = NULL;
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static Volatile arg_volatile = VOLATILE_NO;
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static ExposePort *arg_expose_ports = NULL;
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static void help(void) {
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printf("%s [OPTIONS...] [PATH] [ARGUMENTS...]\n\n"
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"Spawn a minimal namespace container for debugging, testing and building.\n\n"
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" -h --help Show this help\n"
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" --version Print version string\n"
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" -q --quiet Do not show status information\n"
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" -D --directory=PATH Root directory for the container\n"
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" --template=PATH Initialize root directory from template directory,\n"
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" if missing\n"
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" -x --ephemeral Run container with snapshot of root directory, and\n"
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" remove it after exit\n"
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" -i --image=PATH File system device or disk image for the container\n"
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" -b --boot Boot up full system (i.e. invoke init)\n"
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" -u --user=USER Run the command under specified user or uid\n"
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" -M --machine=NAME Set the machine name for the container\n"
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" --uuid=UUID Set a specific machine UUID for the container\n"
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" -S --slice=SLICE Place the container in the specified slice\n"
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" --private-network Disable network in container\n"
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" --network-interface=INTERFACE\n"
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" Assign an existing network interface to the\n"
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" container\n"
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" --network-macvlan=INTERFACE\n"
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" Create a macvlan network interface based on an\n"
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" existing network interface to the container\n"
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" -n --network-veth Add a virtual ethernet connection between host\n"
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" and container\n"
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" --network-bridge=INTERFACE\n"
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" Add a virtual ethernet connection between host\n"
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" and container and add it to an existing bridge on\n"
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" the host\n"
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" -p --port=[PROTOCOL:]HOSTPORT[:CONTAINERPORT]\n"
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" Expose a container IP port on the host\n"
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" -Z --selinux-context=SECLABEL\n"
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" Set the SELinux security context to be used by\n"
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" processes in the container\n"
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" -L --selinux-apifs-context=SECLABEL\n"
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" Set the SELinux security context to be used by\n"
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" API/tmpfs file systems in the container\n"
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" --capability=CAP In addition to the default, retain specified\n"
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" capability\n"
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" --drop-capability=CAP Drop the specified capability from the default set\n"
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" --link-journal=MODE Link up guest journal, one of no, auto, guest, host,\n"
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" try-guest, try-host\n"
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" -j Equivalent to --link-journal=try-guest\n"
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" --read-only Mount the root directory read-only\n"
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" --bind=PATH[:PATH] Bind mount a file or directory from the host into\n"
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" the container\n"
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" --bind-ro=PATH[:PATH] Similar, but creates a read-only bind mount\n"
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" --tmpfs=PATH:[OPTIONS] Mount an empty tmpfs to the specified directory\n"
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" --setenv=NAME=VALUE Pass an environment variable to PID 1\n"
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" --share-system Share system namespaces with host\n"
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" --register=BOOLEAN Register container as machine\n"
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" --keep-unit Do not register a scope for the machine, reuse\n"
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" the service unit nspawn is running in\n"
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" --volatile[=MODE] Run the system in volatile mode\n"
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, program_invocation_short_name);
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}
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static int set_sanitized_path(char **b, const char *path) {
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char *p;
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assert(b);
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assert(path);
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p = canonicalize_file_name(path);
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if (!p) {
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if (errno != ENOENT)
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return -errno;
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p = path_make_absolute_cwd(path);
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if (!p)
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return -ENOMEM;
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}
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free(*b);
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*b = path_kill_slashes(p);
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return 0;
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}
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static int parse_argv(int argc, char *argv[]) {
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enum {
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ARG_VERSION = 0x100,
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ARG_PRIVATE_NETWORK,
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ARG_UUID,
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ARG_READ_ONLY,
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ARG_CAPABILITY,
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ARG_DROP_CAPABILITY,
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ARG_LINK_JOURNAL,
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ARG_BIND,
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ARG_BIND_RO,
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ARG_TMPFS,
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ARG_SETENV,
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ARG_SHARE_SYSTEM,
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ARG_REGISTER,
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ARG_KEEP_UNIT,
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ARG_NETWORK_INTERFACE,
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ARG_NETWORK_MACVLAN,
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ARG_NETWORK_BRIDGE,
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ARG_PERSONALITY,
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ARG_VOLATILE,
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ARG_TEMPLATE,
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};
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static const struct option options[] = {
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{ "help", no_argument, NULL, 'h' },
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{ "version", no_argument, NULL, ARG_VERSION },
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{ "directory", required_argument, NULL, 'D' },
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{ "template", required_argument, NULL, ARG_TEMPLATE },
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{ "ephemeral", no_argument, NULL, 'x' },
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{ "user", required_argument, NULL, 'u' },
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{ "private-network", no_argument, NULL, ARG_PRIVATE_NETWORK },
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{ "boot", no_argument, NULL, 'b' },
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{ "uuid", required_argument, NULL, ARG_UUID },
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{ "read-only", no_argument, NULL, ARG_READ_ONLY },
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{ "capability", required_argument, NULL, ARG_CAPABILITY },
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{ "drop-capability", required_argument, NULL, ARG_DROP_CAPABILITY },
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{ "link-journal", required_argument, NULL, ARG_LINK_JOURNAL },
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{ "bind", required_argument, NULL, ARG_BIND },
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{ "bind-ro", required_argument, NULL, ARG_BIND_RO },
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{ "tmpfs", required_argument, NULL, ARG_TMPFS },
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{ "machine", required_argument, NULL, 'M' },
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{ "slice", required_argument, NULL, 'S' },
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{ "setenv", required_argument, NULL, ARG_SETENV },
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{ "selinux-context", required_argument, NULL, 'Z' },
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{ "selinux-apifs-context", required_argument, NULL, 'L' },
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{ "quiet", no_argument, NULL, 'q' },
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{ "share-system", no_argument, NULL, ARG_SHARE_SYSTEM },
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{ "register", required_argument, NULL, ARG_REGISTER },
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{ "keep-unit", no_argument, NULL, ARG_KEEP_UNIT },
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{ "network-interface", required_argument, NULL, ARG_NETWORK_INTERFACE },
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{ "network-macvlan", required_argument, NULL, ARG_NETWORK_MACVLAN },
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{ "network-veth", no_argument, NULL, 'n' },
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{ "network-bridge", required_argument, NULL, ARG_NETWORK_BRIDGE },
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{ "personality", required_argument, NULL, ARG_PERSONALITY },
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{ "image", required_argument, NULL, 'i' },
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{ "volatile", optional_argument, NULL, ARG_VOLATILE },
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{ "port", required_argument, NULL, 'p' },
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{}
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};
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int c, r;
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uint64_t plus = 0, minus = 0;
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assert(argc >= 0);
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assert(argv);
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while ((c = getopt_long(argc, argv, "+hD:u:bL:M:jS:Z:qi:xp:n", options, NULL)) >= 0)
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switch (c) {
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case 'h':
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help();
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return 0;
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case ARG_VERSION:
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puts(PACKAGE_STRING);
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puts(SYSTEMD_FEATURES);
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return 0;
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case 'D':
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r = set_sanitized_path(&arg_directory, optarg);
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if (r < 0)
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return log_error_errno(r, "Invalid root directory: %m");
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break;
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case ARG_TEMPLATE:
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r = set_sanitized_path(&arg_template, optarg);
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if (r < 0)
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return log_error_errno(r, "Invalid template directory: %m");
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break;
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case 'i':
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r = set_sanitized_path(&arg_image, optarg);
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if (r < 0)
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return log_error_errno(r, "Invalid image path: %m");
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break;
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case 'x':
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arg_ephemeral = true;
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break;
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case 'u':
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free(arg_user);
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arg_user = strdup(optarg);
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if (!arg_user)
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return log_oom();
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break;
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case ARG_NETWORK_BRIDGE:
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arg_network_bridge = optarg;
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/* fall through */
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case 'n':
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arg_network_veth = true;
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arg_private_network = true;
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break;
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case ARG_NETWORK_INTERFACE:
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if (strv_extend(&arg_network_interfaces, optarg) < 0)
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return log_oom();
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arg_private_network = true;
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break;
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case ARG_NETWORK_MACVLAN:
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if (strv_extend(&arg_network_macvlan, optarg) < 0)
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return log_oom();
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/* fall through */
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case ARG_PRIVATE_NETWORK:
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arg_private_network = true;
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break;
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case 'b':
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arg_boot = true;
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break;
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case ARG_UUID:
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r = sd_id128_from_string(optarg, &arg_uuid);
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if (r < 0) {
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log_error("Invalid UUID: %s", optarg);
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return r;
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}
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break;
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case 'S':
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arg_slice = optarg;
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break;
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case 'M':
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if (isempty(optarg)) {
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free(arg_machine);
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arg_machine = NULL;
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} else {
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if (!machine_name_is_valid(optarg)) {
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log_error("Invalid machine name: %s", optarg);
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return -EINVAL;
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}
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r = free_and_strdup(&arg_machine, optarg);
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if (r < 0)
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return log_oom();
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break;
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}
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case 'Z':
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arg_selinux_context = optarg;
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break;
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case 'L':
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arg_selinux_apifs_context = optarg;
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break;
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case ARG_READ_ONLY:
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arg_read_only = true;
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break;
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case ARG_CAPABILITY:
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case ARG_DROP_CAPABILITY: {
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const char *state, *word;
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size_t length;
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FOREACH_WORD_SEPARATOR(word, length, optarg, ",", state) {
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_cleanup_free_ char *t;
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t = strndup(word, length);
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if (!t)
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return log_oom();
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if (streq(t, "all")) {
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if (c == ARG_CAPABILITY)
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plus = (uint64_t) -1;
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else
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minus = (uint64_t) -1;
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} else {
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int cap;
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cap = capability_from_name(t);
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if (cap < 0) {
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log_error("Failed to parse capability %s.", t);
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return -EINVAL;
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}
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if (c == ARG_CAPABILITY)
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plus |= 1ULL << (uint64_t) cap;
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else
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minus |= 1ULL << (uint64_t) cap;
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}
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}
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break;
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}
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case 'j':
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arg_link_journal = LINK_GUEST;
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arg_link_journal_try = true;
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break;
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case ARG_LINK_JOURNAL:
|
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if (streq(optarg, "auto")) {
|
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arg_link_journal = LINK_AUTO;
|
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arg_link_journal_try = false;
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|
} else if (streq(optarg, "no")) {
|
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arg_link_journal = LINK_NO;
|
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arg_link_journal_try = false;
|
|
} else if (streq(optarg, "guest")) {
|
|
arg_link_journal = LINK_GUEST;
|
|
arg_link_journal_try = false;
|
|
} else if (streq(optarg, "host")) {
|
|
arg_link_journal = LINK_HOST;
|
|
arg_link_journal_try = false;
|
|
} else if (streq(optarg, "try-guest")) {
|
|
arg_link_journal = LINK_GUEST;
|
|
arg_link_journal_try = true;
|
|
} else if (streq(optarg, "try-host")) {
|
|
arg_link_journal = LINK_HOST;
|
|
arg_link_journal_try = true;
|
|
} else {
|
|
log_error("Failed to parse link journal mode %s", optarg);
|
|
return -EINVAL;
|
|
}
|
|
|
|
break;
|
|
|
|
case ARG_BIND:
|
|
case ARG_BIND_RO: {
|
|
_cleanup_free_ char *a = NULL, *b = NULL;
|
|
char *e;
|
|
char ***x;
|
|
|
|
x = c == ARG_BIND ? &arg_bind : &arg_bind_ro;
|
|
|
|
e = strchr(optarg, ':');
|
|
if (e) {
|
|
a = strndup(optarg, e - optarg);
|
|
b = strdup(e + 1);
|
|
} else {
|
|
a = strdup(optarg);
|
|
b = strdup(optarg);
|
|
}
|
|
|
|
if (!a || !b)
|
|
return log_oom();
|
|
|
|
if (!path_is_absolute(a) || !path_is_absolute(b)) {
|
|
log_error("Invalid bind mount specification: %s", optarg);
|
|
return -EINVAL;
|
|
}
|
|
|
|
r = strv_extend(x, a);
|
|
if (r < 0)
|
|
return log_oom();
|
|
|
|
r = strv_extend(x, b);
|
|
if (r < 0)
|
|
return log_oom();
|
|
|
|
break;
|
|
}
|
|
|
|
case ARG_TMPFS: {
|
|
_cleanup_free_ char *a = NULL, *b = NULL;
|
|
char *e;
|
|
|
|
e = strchr(optarg, ':');
|
|
if (e) {
|
|
a = strndup(optarg, e - optarg);
|
|
b = strdup(e + 1);
|
|
} else {
|
|
a = strdup(optarg);
|
|
b = strdup("mode=0755");
|
|
}
|
|
|
|
if (!a || !b)
|
|
return log_oom();
|
|
|
|
if (!path_is_absolute(a)) {
|
|
log_error("Invalid tmpfs specification: %s", optarg);
|
|
return -EINVAL;
|
|
}
|
|
|
|
r = strv_push(&arg_tmpfs, a);
|
|
if (r < 0)
|
|
return log_oom();
|
|
|
|
a = NULL;
|
|
|
|
r = strv_push(&arg_tmpfs, b);
|
|
if (r < 0)
|
|
return log_oom();
|
|
|
|
b = NULL;
|
|
|
|
break;
|
|
}
|
|
|
|
case ARG_SETENV: {
|
|
char **n;
|
|
|
|
if (!env_assignment_is_valid(optarg)) {
|
|
log_error("Environment variable assignment '%s' is not valid.", optarg);
|
|
return -EINVAL;
|
|
}
|
|
|
|
n = strv_env_set(arg_setenv, optarg);
|
|
if (!n)
|
|
return log_oom();
|
|
|
|
strv_free(arg_setenv);
|
|
arg_setenv = n;
|
|
break;
|
|
}
|
|
|
|
case 'q':
|
|
arg_quiet = true;
|
|
break;
|
|
|
|
case ARG_SHARE_SYSTEM:
|
|
arg_share_system = true;
|
|
break;
|
|
|
|
case ARG_REGISTER:
|
|
r = parse_boolean(optarg);
|
|
if (r < 0) {
|
|
log_error("Failed to parse --register= argument: %s", optarg);
|
|
return r;
|
|
}
|
|
|
|
arg_register = r;
|
|
break;
|
|
|
|
case ARG_KEEP_UNIT:
|
|
arg_keep_unit = true;
|
|
break;
|
|
|
|
case ARG_PERSONALITY:
|
|
|
|
arg_personality = personality_from_string(optarg);
|
|
if (arg_personality == 0xffffffffLU) {
|
|
log_error("Unknown or unsupported personality '%s'.", optarg);
|
|
return -EINVAL;
|
|
}
|
|
|
|
break;
|
|
|
|
case ARG_VOLATILE:
|
|
|
|
if (!optarg)
|
|
arg_volatile = VOLATILE_YES;
|
|
else {
|
|
r = parse_boolean(optarg);
|
|
if (r < 0) {
|
|
if (streq(optarg, "state"))
|
|
arg_volatile = VOLATILE_STATE;
|
|
else {
|
|
log_error("Failed to parse --volatile= argument: %s", optarg);
|
|
return r;
|
|
}
|
|
} else
|
|
arg_volatile = r ? VOLATILE_YES : VOLATILE_NO;
|
|
}
|
|
|
|
break;
|
|
|
|
case 'p': {
|
|
const char *split, *e;
|
|
uint16_t container_port, host_port;
|
|
int protocol;
|
|
ExposePort *p;
|
|
|
|
if ((e = startswith(optarg, "tcp:")))
|
|
protocol = IPPROTO_TCP;
|
|
else if ((e = startswith(optarg, "udp:")))
|
|
protocol = IPPROTO_UDP;
|
|
else {
|
|
e = optarg;
|
|
protocol = IPPROTO_TCP;
|
|
}
|
|
|
|
split = strchr(e, ':');
|
|
if (split) {
|
|
char v[split - e + 1];
|
|
|
|
memcpy(v, e, split - e);
|
|
v[split - e] = 0;
|
|
|
|
r = safe_atou16(v, &host_port);
|
|
if (r < 0 || host_port <= 0) {
|
|
log_error("Failed to parse host port: %s", optarg);
|
|
return -EINVAL;
|
|
}
|
|
|
|
r = safe_atou16(split + 1, &container_port);
|
|
} else {
|
|
r = safe_atou16(e, &container_port);
|
|
host_port = container_port;
|
|
}
|
|
|
|
if (r < 0 || container_port <= 0) {
|
|
log_error("Failed to parse host port: %s", optarg);
|
|
return -EINVAL;
|
|
}
|
|
|
|
LIST_FOREACH(ports, p, arg_expose_ports) {
|
|
if (p->protocol == protocol && p->host_port == host_port) {
|
|
log_error("Duplicate port specification: %s", optarg);
|
|
return -EINVAL;
|
|
}
|
|
}
|
|
|
|
p = new(ExposePort, 1);
|
|
if (!p)
|
|
return log_oom();
|
|
|
|
p->protocol = protocol;
|
|
p->host_port = host_port;
|
|
p->container_port = container_port;
|
|
|
|
LIST_PREPEND(ports, arg_expose_ports, p);
|
|
|
|
break;
|
|
}
|
|
|
|
case '?':
|
|
return -EINVAL;
|
|
|
|
default:
|
|
assert_not_reached("Unhandled option");
|
|
}
|
|
|
|
if (arg_share_system)
|
|
arg_register = false;
|
|
|
|
if (arg_boot && arg_share_system) {
|
|
log_error("--boot and --share-system may not be combined.");
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (arg_keep_unit && cg_pid_get_owner_uid(0, NULL) >= 0) {
|
|
log_error("--keep-unit may not be used when invoked from a user session.");
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (arg_directory && arg_image) {
|
|
log_error("--directory= and --image= may not be combined.");
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (arg_template && arg_image) {
|
|
log_error("--template= and --image= may not be combined.");
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (arg_template && !(arg_directory || arg_machine)) {
|
|
log_error("--template= needs --directory= or --machine=.");
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (arg_ephemeral && arg_template) {
|
|
log_error("--ephemeral and --template= may not be combined.");
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (arg_ephemeral && arg_image) {
|
|
log_error("--ephemeral and --image= may not be combined.");
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (arg_ephemeral && !IN_SET(arg_link_journal, LINK_NO, LINK_AUTO)) {
|
|
log_error("--ephemeral and --link-journal= may not be combined.");
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (arg_volatile != VOLATILE_NO && arg_read_only) {
|
|
log_error("Cannot combine --read-only with --volatile. Note that --volatile already implies a read-only base hierarchy.");
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (arg_expose_ports && !arg_private_network) {
|
|
log_error("Cannot use --port= without private networking.");
|
|
return -EINVAL;
|
|
}
|
|
|
|
arg_retain = (arg_retain | plus | (arg_private_network ? 1ULL << CAP_NET_ADMIN : 0)) & ~minus;
|
|
|
|
return 1;
|
|
}
|
|
|
|
static int mount_all(const char *dest) {
|
|
|
|
typedef struct MountPoint {
|
|
const char *what;
|
|
const char *where;
|
|
const char *type;
|
|
const char *options;
|
|
unsigned long flags;
|
|
bool fatal;
|
|
} MountPoint;
|
|
|
|
static const MountPoint mount_table[] = {
|
|
{ "proc", "/proc", "proc", NULL, MS_NOSUID|MS_NOEXEC|MS_NODEV, true },
|
|
{ "/proc/sys", "/proc/sys", NULL, NULL, MS_BIND, true }, /* Bind mount first */
|
|
{ NULL, "/proc/sys", NULL, NULL, MS_BIND|MS_RDONLY|MS_REMOUNT, true }, /* Then, make it r/o */
|
|
{ "sysfs", "/sys", "sysfs", NULL, MS_RDONLY|MS_NOSUID|MS_NOEXEC|MS_NODEV, true },
|
|
{ "tmpfs", "/dev", "tmpfs", "mode=755", MS_NOSUID|MS_STRICTATIME, true },
|
|
{ "devpts", "/dev/pts", "devpts","newinstance,ptmxmode=0666,mode=620,gid=" STRINGIFY(TTY_GID), MS_NOSUID|MS_NOEXEC, true },
|
|
{ "tmpfs", "/dev/shm", "tmpfs", "mode=1777", MS_NOSUID|MS_NODEV|MS_STRICTATIME, true },
|
|
{ "tmpfs", "/run", "tmpfs", "mode=755", MS_NOSUID|MS_NODEV|MS_STRICTATIME, true },
|
|
#ifdef HAVE_SELINUX
|
|
{ "/sys/fs/selinux", "/sys/fs/selinux", NULL, NULL, MS_BIND, false }, /* Bind mount first */
|
|
{ NULL, "/sys/fs/selinux", NULL, NULL, MS_BIND|MS_RDONLY|MS_REMOUNT, false }, /* Then, make it r/o */
|
|
#endif
|
|
};
|
|
|
|
unsigned k;
|
|
int r = 0;
|
|
|
|
for (k = 0; k < ELEMENTSOF(mount_table); k++) {
|
|
_cleanup_free_ char *where = NULL;
|
|
#ifdef HAVE_SELINUX
|
|
_cleanup_free_ char *options = NULL;
|
|
#endif
|
|
const char *o;
|
|
int t;
|
|
|
|
where = strjoin(dest, "/", mount_table[k].where, NULL);
|
|
if (!where)
|
|
return log_oom();
|
|
|
|
t = path_is_mount_point(where, true);
|
|
if (t < 0) {
|
|
log_error_errno(t, "Failed to detect whether %s is a mount point: %m", where);
|
|
|
|
if (r == 0)
|
|
r = t;
|
|
|
|
continue;
|
|
}
|
|
|
|
/* Skip this entry if it is not a remount. */
|
|
if (mount_table[k].what && t > 0)
|
|
continue;
|
|
|
|
t = mkdir_p(where, 0755);
|
|
if (t < 0) {
|
|
if (mount_table[k].fatal) {
|
|
log_error_errno(t, "Failed to create directory %s: %m", where);
|
|
|
|
if (r == 0)
|
|
r = t;
|
|
} else
|
|
log_warning_errno(t, "Failed to create directory %s: %m", where);
|
|
|
|
continue;
|
|
}
|
|
|
|
#ifdef HAVE_SELINUX
|
|
if (arg_selinux_apifs_context &&
|
|
(streq_ptr(mount_table[k].what, "tmpfs") || streq_ptr(mount_table[k].what, "devpts"))) {
|
|
options = strjoin(mount_table[k].options, ",context=\"", arg_selinux_apifs_context, "\"", NULL);
|
|
if (!options)
|
|
return log_oom();
|
|
|
|
o = options;
|
|
} else
|
|
#endif
|
|
o = mount_table[k].options;
|
|
|
|
|
|
if (mount(mount_table[k].what,
|
|
where,
|
|
mount_table[k].type,
|
|
mount_table[k].flags,
|
|
o) < 0) {
|
|
|
|
if (mount_table[k].fatal) {
|
|
log_error_errno(errno, "mount(%s) failed: %m", where);
|
|
|
|
if (r == 0)
|
|
r = -errno;
|
|
} else
|
|
log_warning_errno(errno, "mount(%s) failed: %m", where);
|
|
}
|
|
}
|
|
|
|
return r;
|
|
}
|
|
|
|
static int mount_binds(const char *dest, char **l, bool ro) {
|
|
char **x, **y;
|
|
|
|
STRV_FOREACH_PAIR(x, y, l) {
|
|
_cleanup_free_ char *where = NULL;
|
|
struct stat source_st, dest_st;
|
|
int r;
|
|
|
|
if (stat(*x, &source_st) < 0)
|
|
return log_error_errno(errno, "Failed to stat %s: %m", *x);
|
|
|
|
where = strappend(dest, *y);
|
|
if (!where)
|
|
return log_oom();
|
|
|
|
r = stat(where, &dest_st);
|
|
if (r == 0) {
|
|
if ((source_st.st_mode & S_IFMT) != (dest_st.st_mode & S_IFMT)) {
|
|
log_error("The file types of %s and %s do not match. Refusing bind mount", *x, where);
|
|
return -EINVAL;
|
|
}
|
|
} else if (errno == ENOENT) {
|
|
r = mkdir_parents_label(where, 0755);
|
|
if (r < 0)
|
|
return log_error_errno(r, "Failed to bind mount %s: %m", *x);
|
|
} else {
|
|
log_error_errno(errno, "Failed to bind mount %s: %m", *x);
|
|
return -errno;
|
|
}
|
|
|
|
/* Create the mount point, but be conservative -- refuse to create block
|
|
* and char devices. */
|
|
if (S_ISDIR(source_st.st_mode)) {
|
|
r = mkdir_label(where, 0755);
|
|
if (r < 0 && errno != EEXIST)
|
|
return log_error_errno(r, "Failed to create mount point %s: %m", where);
|
|
} else if (S_ISFIFO(source_st.st_mode)) {
|
|
r = mkfifo(where, 0644);
|
|
if (r < 0 && errno != EEXIST)
|
|
return log_error_errno(errno, "Failed to create mount point %s: %m", where);
|
|
} else if (S_ISSOCK(source_st.st_mode)) {
|
|
r = mknod(where, 0644 | S_IFSOCK, 0);
|
|
if (r < 0 && errno != EEXIST)
|
|
return log_error_errno(errno, "Failed to create mount point %s: %m", where);
|
|
} else if (S_ISREG(source_st.st_mode)) {
|
|
r = touch(where);
|
|
if (r < 0)
|
|
return log_error_errno(r, "Failed to create mount point %s: %m", where);
|
|
} else {
|
|
log_error("Refusing to create mountpoint for file: %s", *x);
|
|
return -ENOTSUP;
|
|
}
|
|
|
|
if (mount(*x, where, "bind", MS_BIND, NULL) < 0)
|
|
return log_error_errno(errno, "mount(%s) failed: %m", where);
|
|
|
|
if (ro) {
|
|
r = bind_remount_recursive(where, true);
|
|
if (r < 0)
|
|
return log_error_errno(r, "Read-Only bind mount failed: %m");
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int mount_cgroup_hierarchy(const char *dest, const char *controller, const char *hierarchy, bool read_only) {
|
|
char *to;
|
|
int r;
|
|
|
|
to = strappenda(dest, "/sys/fs/cgroup/", hierarchy);
|
|
|
|
r = path_is_mount_point(to, false);
|
|
if (r < 0)
|
|
return log_error_errno(r, "Failed to determine if %s is mounted already: %m", to);
|
|
if (r > 0)
|
|
return 0;
|
|
|
|
mkdir_p(to, 0755);
|
|
|
|
if (mount("cgroup", to, "cgroup", MS_NOSUID|MS_NOEXEC|MS_NODEV|(read_only ? MS_RDONLY : 0), controller) < 0)
|
|
return log_error_errno(errno, "Failed to mount to %s: %m", to);
|
|
|
|
return 1;
|
|
}
|
|
|
|
static int mount_cgroup(const char *dest) {
|
|
_cleanup_set_free_free_ Set *controllers = NULL;
|
|
_cleanup_free_ char *own_cgroup_path = NULL;
|
|
const char *cgroup_root, *systemd_root, *systemd_own;
|
|
int r;
|
|
|
|
controllers = set_new(&string_hash_ops);
|
|
if (!controllers)
|
|
return log_oom();
|
|
|
|
r = cg_kernel_controllers(controllers);
|
|
if (r < 0)
|
|
return log_error_errno(r, "Failed to determine cgroup controllers: %m");
|
|
|
|
r = cg_pid_get_path(NULL, 0, &own_cgroup_path);
|
|
if (r < 0)
|
|
return log_error_errno(r, "Failed to determine our own cgroup path: %m");
|
|
|
|
cgroup_root = strappenda(dest, "/sys/fs/cgroup");
|
|
if (mount("tmpfs", cgroup_root, "tmpfs", MS_NOSUID|MS_NOEXEC|MS_NODEV|MS_STRICTATIME, "mode=755") < 0)
|
|
return log_error_errno(errno, "Failed to mount tmpfs to /sys/fs/cgroup: %m");
|
|
|
|
for (;;) {
|
|
_cleanup_free_ char *controller = NULL, *origin = NULL, *combined = NULL;
|
|
|
|
controller = set_steal_first(controllers);
|
|
if (!controller)
|
|
break;
|
|
|
|
origin = strappend("/sys/fs/cgroup/", controller);
|
|
if (!origin)
|
|
return log_oom();
|
|
|
|
r = readlink_malloc(origin, &combined);
|
|
if (r == -EINVAL) {
|
|
/* Not a symbolic link, but directly a single cgroup hierarchy */
|
|
|
|
r = mount_cgroup_hierarchy(dest, controller, controller, true);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
} else if (r < 0)
|
|
return log_error_errno(r, "Failed to read link %s: %m", origin);
|
|
else {
|
|
_cleanup_free_ char *target = NULL;
|
|
|
|
target = strjoin(dest, "/sys/fs/cgroup/", controller, NULL);
|
|
if (!target)
|
|
return log_oom();
|
|
|
|
/* A symbolic link, a combination of controllers in one hierarchy */
|
|
|
|
if (!filename_is_valid(combined)) {
|
|
log_warning("Ignoring invalid combined hierarchy %s.", combined);
|
|
continue;
|
|
}
|
|
|
|
r = mount_cgroup_hierarchy(dest, combined, combined, true);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
if (symlink(combined, target) < 0)
|
|
return log_error_errno(errno, "Failed to create symlink for combined hiearchy: %m");
|
|
}
|
|
}
|
|
|
|
r = mount_cgroup_hierarchy(dest, "name=systemd", "systemd", false);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
/* Make our own cgroup a (writable) bind mount */
|
|
systemd_own = strappenda(dest, "/sys/fs/cgroup/systemd", own_cgroup_path);
|
|
if (mount(systemd_own, systemd_own, NULL, MS_BIND, NULL) < 0)
|
|
return log_error_errno(errno, "Failed to turn %s into a bind mount: %m", own_cgroup_path);
|
|
|
|
/* And then remount the systemd cgroup root read-only */
|
|
systemd_root = strappenda(dest, "/sys/fs/cgroup/systemd");
|
|
if (mount(NULL, systemd_root, NULL, MS_BIND|MS_REMOUNT|MS_NOSUID|MS_NOEXEC|MS_NODEV|MS_RDONLY, NULL) < 0)
|
|
return log_error_errno(errno, "Failed to mount cgroup root read-only: %m");
|
|
|
|
if (mount(NULL, cgroup_root, NULL, MS_REMOUNT|MS_NOSUID|MS_NOEXEC|MS_NODEV|MS_STRICTATIME|MS_RDONLY, "mode=755") < 0)
|
|
return log_error_errno(errno, "Failed to remount %s read-only: %m", cgroup_root);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int mount_tmpfs(const char *dest) {
|
|
char **i, **o;
|
|
|
|
STRV_FOREACH_PAIR(i, o, arg_tmpfs) {
|
|
_cleanup_free_ char *where = NULL;
|
|
int r;
|
|
|
|
where = strappend(dest, *i);
|
|
if (!where)
|
|
return log_oom();
|
|
|
|
r = mkdir_label(where, 0755);
|
|
if (r < 0 && r != -EEXIST)
|
|
return log_error_errno(r, "Creating mount point for tmpfs %s failed: %m", where);
|
|
|
|
if (mount("tmpfs", where, "tmpfs", MS_NODEV|MS_STRICTATIME, *o) < 0)
|
|
return log_error_errno(errno, "tmpfs mount to %s failed: %m", where);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int setup_timezone(const char *dest) {
|
|
_cleanup_free_ char *where = NULL, *p = NULL, *q = NULL, *check = NULL, *what = NULL;
|
|
char *z, *y;
|
|
int r;
|
|
|
|
assert(dest);
|
|
|
|
/* Fix the timezone, if possible */
|
|
r = readlink_malloc("/etc/localtime", &p);
|
|
if (r < 0) {
|
|
log_warning("/etc/localtime is not a symlink, not updating container timezone.");
|
|
return 0;
|
|
}
|
|
|
|
z = path_startswith(p, "../usr/share/zoneinfo/");
|
|
if (!z)
|
|
z = path_startswith(p, "/usr/share/zoneinfo/");
|
|
if (!z) {
|
|
log_warning("/etc/localtime does not point into /usr/share/zoneinfo/, not updating container timezone.");
|
|
return 0;
|
|
}
|
|
|
|
where = strappend(dest, "/etc/localtime");
|
|
if (!where)
|
|
return log_oom();
|
|
|
|
r = readlink_malloc(where, &q);
|
|
if (r >= 0) {
|
|
y = path_startswith(q, "../usr/share/zoneinfo/");
|
|
if (!y)
|
|
y = path_startswith(q, "/usr/share/zoneinfo/");
|
|
|
|
/* Already pointing to the right place? Then do nothing .. */
|
|
if (y && streq(y, z))
|
|
return 0;
|
|
}
|
|
|
|
check = strjoin(dest, "/usr/share/zoneinfo/", z, NULL);
|
|
if (!check)
|
|
return log_oom();
|
|
|
|
if (access(check, F_OK) < 0) {
|
|
log_warning("Timezone %s does not exist in container, not updating container timezone.", z);
|
|
return 0;
|
|
}
|
|
|
|
what = strappend("../usr/share/zoneinfo/", z);
|
|
if (!what)
|
|
return log_oom();
|
|
|
|
r = mkdir_parents(where, 0755);
|
|
if (r < 0) {
|
|
log_error_errno(r, "Failed to create directory for timezone info %s in container: %m", where);
|
|
|
|
return 0;
|
|
}
|
|
|
|
r = unlink(where);
|
|
if (r < 0 && errno != ENOENT) {
|
|
log_error_errno(errno, "Failed to remove existing timezone info %s in container: %m", where);
|
|
|
|
return 0;
|
|
}
|
|
|
|
if (symlink(what, where) < 0) {
|
|
log_error_errno(errno, "Failed to correct timezone of container: %m");
|
|
return 0;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int setup_resolv_conf(const char *dest) {
|
|
_cleanup_free_ char *where = NULL;
|
|
int r;
|
|
|
|
assert(dest);
|
|
|
|
if (arg_private_network)
|
|
return 0;
|
|
|
|
/* Fix resolv.conf, if possible */
|
|
where = strappend(dest, "/etc/resolv.conf");
|
|
if (!where)
|
|
return log_oom();
|
|
|
|
/* We don't really care for the results of this really. If it
|
|
* fails, it fails, but meh... */
|
|
r = mkdir_parents(where, 0755);
|
|
if (r < 0) {
|
|
log_warning_errno(r, "Failed to create parent directory for resolv.conf %s: %m", where);
|
|
|
|
return 0;
|
|
}
|
|
|
|
r = copy_file("/etc/resolv.conf", where, O_TRUNC|O_NOFOLLOW, 0644, 0);
|
|
if (r < 0) {
|
|
log_warning_errno(r, "Failed to copy /etc/resolv.conf to %s: %m", where);
|
|
|
|
return 0;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int setup_volatile_state(const char *directory) {
|
|
const char *p;
|
|
int r;
|
|
|
|
assert(directory);
|
|
|
|
if (arg_volatile != VOLATILE_STATE)
|
|
return 0;
|
|
|
|
/* --volatile=state means we simply overmount /var
|
|
with a tmpfs, and the rest read-only. */
|
|
|
|
r = bind_remount_recursive(directory, true);
|
|
if (r < 0)
|
|
return log_error_errno(r, "Failed to remount %s read-only: %m", directory);
|
|
|
|
p = strappenda(directory, "/var");
|
|
r = mkdir(p, 0755);
|
|
if (r < 0 && errno != EEXIST)
|
|
return log_error_errno(errno, "Failed to create %s: %m", directory);
|
|
|
|
if (mount("tmpfs", p, "tmpfs", MS_STRICTATIME, "mode=755") < 0)
|
|
return log_error_errno(errno, "Failed to mount tmpfs to /var: %m");
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int setup_volatile(const char *directory) {
|
|
bool tmpfs_mounted = false, bind_mounted = false;
|
|
char template[] = "/tmp/nspawn-volatile-XXXXXX";
|
|
const char *f, *t;
|
|
int r;
|
|
|
|
assert(directory);
|
|
|
|
if (arg_volatile != VOLATILE_YES)
|
|
return 0;
|
|
|
|
/* --volatile=yes means we mount a tmpfs to the root dir, and
|
|
the original /usr to use inside it, and that read-only. */
|
|
|
|
if (!mkdtemp(template))
|
|
return log_error_errno(errno, "Failed to create temporary directory: %m");
|
|
|
|
if (mount("tmpfs", template, "tmpfs", MS_STRICTATIME, "mode=755") < 0) {
|
|
log_error_errno(errno, "Failed to mount tmpfs for root directory: %m");
|
|
r = -errno;
|
|
goto fail;
|
|
}
|
|
|
|
tmpfs_mounted = true;
|
|
|
|
f = strappenda(directory, "/usr");
|
|
t = strappenda(template, "/usr");
|
|
|
|
r = mkdir(t, 0755);
|
|
if (r < 0 && errno != EEXIST) {
|
|
log_error_errno(errno, "Failed to create %s: %m", t);
|
|
r = -errno;
|
|
goto fail;
|
|
}
|
|
|
|
if (mount(f, t, "bind", MS_BIND|MS_REC, NULL) < 0) {
|
|
log_error_errno(errno, "Failed to create /usr bind mount: %m");
|
|
r = -errno;
|
|
goto fail;
|
|
}
|
|
|
|
bind_mounted = true;
|
|
|
|
r = bind_remount_recursive(t, true);
|
|
if (r < 0) {
|
|
log_error_errno(r, "Failed to remount %s read-only: %m", t);
|
|
goto fail;
|
|
}
|
|
|
|
if (mount(template, directory, NULL, MS_MOVE, NULL) < 0) {
|
|
log_error_errno(errno, "Failed to move root mount: %m");
|
|
r = -errno;
|
|
goto fail;
|
|
}
|
|
|
|
rmdir(template);
|
|
|
|
return 0;
|
|
|
|
fail:
|
|
if (bind_mounted)
|
|
umount(t);
|
|
if (tmpfs_mounted)
|
|
umount(template);
|
|
rmdir(template);
|
|
return r;
|
|
}
|
|
|
|
static char* id128_format_as_uuid(sd_id128_t id, char s[37]) {
|
|
|
|
snprintf(s, 37,
|
|
"%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x",
|
|
SD_ID128_FORMAT_VAL(id));
|
|
|
|
return s;
|
|
}
|
|
|
|
static int setup_boot_id(const char *dest) {
|
|
_cleanup_free_ char *from = NULL, *to = NULL;
|
|
sd_id128_t rnd = {};
|
|
char as_uuid[37];
|
|
int r;
|
|
|
|
assert(dest);
|
|
|
|
if (arg_share_system)
|
|
return 0;
|
|
|
|
/* Generate a new randomized boot ID, so that each boot-up of
|
|
* the container gets a new one */
|
|
|
|
from = strappend(dest, "/dev/proc-sys-kernel-random-boot-id");
|
|
to = strappend(dest, "/proc/sys/kernel/random/boot_id");
|
|
if (!from || !to)
|
|
return log_oom();
|
|
|
|
r = sd_id128_randomize(&rnd);
|
|
if (r < 0)
|
|
return log_error_errno(r, "Failed to generate random boot id: %m");
|
|
|
|
id128_format_as_uuid(rnd, as_uuid);
|
|
|
|
r = write_string_file(from, as_uuid);
|
|
if (r < 0)
|
|
return log_error_errno(r, "Failed to write boot id: %m");
|
|
|
|
if (mount(from, to, "bind", MS_BIND, NULL) < 0) {
|
|
log_error_errno(errno, "Failed to bind mount boot id: %m");
|
|
r = -errno;
|
|
} else if (mount(from, to, "bind", MS_BIND|MS_REMOUNT|MS_RDONLY, NULL))
|
|
log_warning_errno(errno, "Failed to make boot id read-only: %m");
|
|
|
|
unlink(from);
|
|
return r;
|
|
}
|
|
|
|
static int copy_devnodes(const char *dest) {
|
|
|
|
static const char devnodes[] =
|
|
"null\0"
|
|
"zero\0"
|
|
"full\0"
|
|
"random\0"
|
|
"urandom\0"
|
|
"tty\0"
|
|
"net/tun\0";
|
|
|
|
const char *d;
|
|
int r = 0;
|
|
_cleanup_umask_ mode_t u;
|
|
|
|
assert(dest);
|
|
|
|
u = umask(0000);
|
|
|
|
NULSTR_FOREACH(d, devnodes) {
|
|
_cleanup_free_ char *from = NULL, *to = NULL;
|
|
struct stat st;
|
|
|
|
from = strappend("/dev/", d);
|
|
to = strjoin(dest, "/dev/", d, NULL);
|
|
if (!from || !to)
|
|
return log_oom();
|
|
|
|
if (stat(from, &st) < 0) {
|
|
|
|
if (errno != ENOENT)
|
|
return log_error_errno(errno, "Failed to stat %s: %m", from);
|
|
|
|
} else if (!S_ISCHR(st.st_mode) && !S_ISBLK(st.st_mode)) {
|
|
|
|
log_error("%s is not a char or block device, cannot copy", from);
|
|
return -EIO;
|
|
|
|
} else {
|
|
r = mkdir_parents(to, 0775);
|
|
if (r < 0) {
|
|
log_error_errno(r, "Failed to create parent directory of %s: %m", to);
|
|
return -r;
|
|
}
|
|
|
|
if (mknod(to, st.st_mode, st.st_rdev) < 0)
|
|
return log_error_errno(errno, "mknod(%s) failed: %m", to);
|
|
}
|
|
}
|
|
|
|
return r;
|
|
}
|
|
|
|
static int setup_ptmx(const char *dest) {
|
|
_cleanup_free_ char *p = NULL;
|
|
|
|
p = strappend(dest, "/dev/ptmx");
|
|
if (!p)
|
|
return log_oom();
|
|
|
|
if (symlink("pts/ptmx", p) < 0)
|
|
return log_error_errno(errno, "Failed to create /dev/ptmx symlink: %m");
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int setup_dev_console(const char *dest, const char *console) {
|
|
_cleanup_umask_ mode_t u;
|
|
const char *to;
|
|
struct stat st;
|
|
int r;
|
|
|
|
assert(dest);
|
|
assert(console);
|
|
|
|
u = umask(0000);
|
|
|
|
if (stat("/dev/null", &st) < 0)
|
|
return log_error_errno(errno, "Failed to stat /dev/null: %m");
|
|
|
|
r = chmod_and_chown(console, 0600, 0, 0);
|
|
if (r < 0)
|
|
return log_error_errno(r, "Failed to correct access mode for TTY: %m");
|
|
|
|
/* We need to bind mount the right tty to /dev/console since
|
|
* ptys can only exist on pts file systems. To have something
|
|
* to bind mount things on we create a device node first, and
|
|
* use /dev/null for that since we the cgroups device policy
|
|
* allows us to create that freely, while we cannot create
|
|
* /dev/console. (Note that the major minor doesn't actually
|
|
* matter here, since we mount it over anyway). */
|
|
|
|
to = strappenda(dest, "/dev/console");
|
|
if (mknod(to, (st.st_mode & ~07777) | 0600, st.st_rdev) < 0)
|
|
return log_error_errno(errno, "mknod() for /dev/console failed: %m");
|
|
|
|
if (mount(console, to, "bind", MS_BIND, NULL) < 0)
|
|
return log_error_errno(errno, "Bind mount for /dev/console failed: %m");
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int setup_kmsg(const char *dest, int kmsg_socket) {
|
|
_cleanup_free_ char *from = NULL, *to = NULL;
|
|
_cleanup_umask_ mode_t u;
|
|
int r, fd, k;
|
|
union {
|
|
struct cmsghdr cmsghdr;
|
|
uint8_t buf[CMSG_SPACE(sizeof(int))];
|
|
} control = {};
|
|
struct msghdr mh = {
|
|
.msg_control = &control,
|
|
.msg_controllen = sizeof(control),
|
|
};
|
|
struct cmsghdr *cmsg;
|
|
|
|
assert(dest);
|
|
assert(kmsg_socket >= 0);
|
|
|
|
u = umask(0000);
|
|
|
|
/* We create the kmsg FIFO as /dev/kmsg, but immediately
|
|
* delete it after bind mounting it to /proc/kmsg. While FIFOs
|
|
* on the reading side behave very similar to /proc/kmsg,
|
|
* their writing side behaves differently from /dev/kmsg in
|
|
* that writing blocks when nothing is reading. In order to
|
|
* avoid any problems with containers deadlocking due to this
|
|
* we simply make /dev/kmsg unavailable to the container. */
|
|
if (asprintf(&from, "%s/dev/kmsg", dest) < 0 ||
|
|
asprintf(&to, "%s/proc/kmsg", dest) < 0)
|
|
return log_oom();
|
|
|
|
if (mkfifo(from, 0600) < 0)
|
|
return log_error_errno(errno, "mkfifo() for /dev/kmsg failed: %m");
|
|
|
|
r = chmod_and_chown(from, 0600, 0, 0);
|
|
if (r < 0)
|
|
return log_error_errno(r, "Failed to correct access mode for /dev/kmsg: %m");
|
|
|
|
if (mount(from, to, "bind", MS_BIND, NULL) < 0)
|
|
return log_error_errno(errno, "Bind mount for /proc/kmsg failed: %m");
|
|
|
|
fd = open(from, O_RDWR|O_NDELAY|O_CLOEXEC);
|
|
if (fd < 0)
|
|
return log_error_errno(errno, "Failed to open fifo: %m");
|
|
|
|
cmsg = CMSG_FIRSTHDR(&mh);
|
|
cmsg->cmsg_level = SOL_SOCKET;
|
|
cmsg->cmsg_type = SCM_RIGHTS;
|
|
cmsg->cmsg_len = CMSG_LEN(sizeof(int));
|
|
memcpy(CMSG_DATA(cmsg), &fd, sizeof(int));
|
|
|
|
mh.msg_controllen = cmsg->cmsg_len;
|
|
|
|
/* Store away the fd in the socket, so that it stays open as
|
|
* long as we run the child */
|
|
k = sendmsg(kmsg_socket, &mh, MSG_NOSIGNAL);
|
|
safe_close(fd);
|
|
|
|
if (k < 0)
|
|
return log_error_errno(errno, "Failed to send FIFO fd: %m");
|
|
|
|
/* And now make the FIFO unavailable as /dev/kmsg... */
|
|
unlink(from);
|
|
return 0;
|
|
}
|
|
|
|
static int send_rtnl(int send_fd) {
|
|
union {
|
|
struct cmsghdr cmsghdr;
|
|
uint8_t buf[CMSG_SPACE(sizeof(int))];
|
|
} control = {};
|
|
struct msghdr mh = {
|
|
.msg_control = &control,
|
|
.msg_controllen = sizeof(control),
|
|
};
|
|
struct cmsghdr *cmsg;
|
|
_cleanup_close_ int fd = -1;
|
|
ssize_t k;
|
|
|
|
assert(send_fd >= 0);
|
|
|
|
if (!arg_expose_ports)
|
|
return 0;
|
|
|
|
fd = socket(PF_NETLINK, SOCK_RAW|SOCK_CLOEXEC|SOCK_NONBLOCK, NETLINK_ROUTE);
|
|
if (fd < 0)
|
|
return log_error_errno(errno, "failed to allocate container netlink: %m");
|
|
|
|
cmsg = CMSG_FIRSTHDR(&mh);
|
|
cmsg->cmsg_level = SOL_SOCKET;
|
|
cmsg->cmsg_type = SCM_RIGHTS;
|
|
cmsg->cmsg_len = CMSG_LEN(sizeof(int));
|
|
memcpy(CMSG_DATA(cmsg), &fd, sizeof(int));
|
|
|
|
mh.msg_controllen = cmsg->cmsg_len;
|
|
|
|
/* Store away the fd in the socket, so that it stays open as
|
|
* long as we run the child */
|
|
k = sendmsg(send_fd, &mh, MSG_NOSIGNAL);
|
|
if (k < 0)
|
|
return log_error_errno(errno, "Failed to send netlink fd: %m");
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int flush_ports(union in_addr_union *exposed) {
|
|
ExposePort *p;
|
|
int r, af = AF_INET;
|
|
|
|
assert(exposed);
|
|
|
|
if (!arg_expose_ports)
|
|
return 0;
|
|
|
|
if (in_addr_is_null(af, exposed))
|
|
return 0;
|
|
|
|
log_debug("Lost IP address.");
|
|
|
|
LIST_FOREACH(ports, p, arg_expose_ports) {
|
|
r = fw_add_local_dnat(false,
|
|
af,
|
|
p->protocol,
|
|
NULL,
|
|
NULL, 0,
|
|
NULL, 0,
|
|
p->host_port,
|
|
exposed,
|
|
p->container_port,
|
|
NULL);
|
|
if (r < 0)
|
|
log_warning_errno(r, "Failed to modify firewall: %m");
|
|
}
|
|
|
|
*exposed = IN_ADDR_NULL;
|
|
return 0;
|
|
}
|
|
|
|
static int expose_ports(sd_rtnl *rtnl, union in_addr_union *exposed) {
|
|
_cleanup_free_ struct local_address *addresses = NULL;
|
|
_cleanup_free_ char *pretty = NULL;
|
|
union in_addr_union new_exposed;
|
|
ExposePort *p;
|
|
bool add;
|
|
int af = AF_INET, r;
|
|
|
|
assert(exposed);
|
|
|
|
/* Invoked each time an address is added or removed inside the
|
|
* container */
|
|
|
|
if (!arg_expose_ports)
|
|
return 0;
|
|
|
|
r = local_addresses(rtnl, 0, af, &addresses);
|
|
if (r < 0)
|
|
return log_error_errno(r, "Failed to enumerate local addresses: %m");
|
|
|
|
add = r > 0 &&
|
|
addresses[0].family == af &&
|
|
addresses[0].scope < RT_SCOPE_LINK;
|
|
|
|
if (!add)
|
|
return flush_ports(exposed);
|
|
|
|
new_exposed = addresses[0].address;
|
|
if (in_addr_equal(af, exposed, &new_exposed))
|
|
return 0;
|
|
|
|
in_addr_to_string(af, &new_exposed, &pretty);
|
|
log_debug("New container IP is %s.", strna(pretty));
|
|
|
|
LIST_FOREACH(ports, p, arg_expose_ports) {
|
|
|
|
r = fw_add_local_dnat(true,
|
|
af,
|
|
p->protocol,
|
|
NULL,
|
|
NULL, 0,
|
|
NULL, 0,
|
|
p->host_port,
|
|
&new_exposed,
|
|
p->container_port,
|
|
in_addr_is_null(af, exposed) ? NULL : exposed);
|
|
if (r < 0)
|
|
log_warning_errno(r, "Failed to modify firewall: %m");
|
|
}
|
|
|
|
*exposed = new_exposed;
|
|
return 0;
|
|
}
|
|
|
|
static int on_address_change(sd_rtnl *rtnl, sd_rtnl_message *m, void *userdata) {
|
|
union in_addr_union *exposed = userdata;
|
|
|
|
assert(rtnl);
|
|
assert(m);
|
|
assert(exposed);
|
|
|
|
expose_ports(rtnl, exposed);
|
|
return 0;
|
|
}
|
|
|
|
static int watch_rtnl(sd_event *event, int recv_fd, union in_addr_union *exposed, sd_rtnl **ret) {
|
|
union {
|
|
struct cmsghdr cmsghdr;
|
|
uint8_t buf[CMSG_SPACE(sizeof(int))];
|
|
} control = {};
|
|
struct msghdr mh = {
|
|
.msg_control = &control,
|
|
.msg_controllen = sizeof(control),
|
|
};
|
|
struct cmsghdr *cmsg;
|
|
_cleanup_rtnl_unref_ sd_rtnl *rtnl = NULL;
|
|
int fd, r;
|
|
ssize_t k;
|
|
|
|
assert(event);
|
|
assert(recv_fd >= 0);
|
|
assert(ret);
|
|
|
|
if (!arg_expose_ports)
|
|
return 0;
|
|
|
|
k = recvmsg(recv_fd, &mh, MSG_NOSIGNAL);
|
|
if (k < 0)
|
|
return log_error_errno(errno, "Failed to recv netlink fd: %m");
|
|
|
|
cmsg = CMSG_FIRSTHDR(&mh);
|
|
assert(cmsg->cmsg_level == SOL_SOCKET);
|
|
assert(cmsg->cmsg_type == SCM_RIGHTS);
|
|
assert(cmsg->cmsg_len == CMSG_LEN(sizeof(int)));
|
|
memcpy(&fd, CMSG_DATA(cmsg), sizeof(int));
|
|
|
|
r = sd_rtnl_open_fd(&rtnl, fd, 1, RTNLGRP_IPV4_IFADDR);
|
|
if (r < 0) {
|
|
safe_close(fd);
|
|
return log_error_errno(r, "Failed to create rtnl object: %m");
|
|
}
|
|
|
|
r = sd_rtnl_add_match(rtnl, RTM_NEWADDR, on_address_change, exposed);
|
|
if (r < 0)
|
|
return log_error_errno(r, "Failed to subscribe to RTM_NEWADDR messages: %m");
|
|
|
|
r = sd_rtnl_add_match(rtnl, RTM_DELADDR, on_address_change, exposed);
|
|
if (r < 0)
|
|
return log_error_errno(r, "Failed to subscribe to RTM_DELADDR messages: %m");
|
|
|
|
r = sd_rtnl_attach_event(rtnl, event, 0);
|
|
if (r < 0)
|
|
return log_error_errno(r, "Failed to add to even loop: %m");
|
|
|
|
*ret = rtnl;
|
|
rtnl = NULL;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int setup_hostname(void) {
|
|
|
|
if (arg_share_system)
|
|
return 0;
|
|
|
|
if (sethostname_idempotent(arg_machine) < 0)
|
|
return -errno;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int setup_journal(const char *directory) {
|
|
sd_id128_t machine_id, this_id;
|
|
_cleanup_free_ char *p = NULL, *b = NULL, *q = NULL, *d = NULL;
|
|
char *id;
|
|
int r;
|
|
|
|
/* Don't link journals in ephemeral mode */
|
|
if (arg_ephemeral)
|
|
return 0;
|
|
|
|
p = strappend(directory, "/etc/machine-id");
|
|
if (!p)
|
|
return log_oom();
|
|
|
|
r = read_one_line_file(p, &b);
|
|
if (r == -ENOENT && arg_link_journal == LINK_AUTO)
|
|
return 0;
|
|
else if (r < 0)
|
|
return log_error_errno(r, "Failed to read machine ID from %s: %m", p);
|
|
|
|
id = strstrip(b);
|
|
if (isempty(id) && arg_link_journal == LINK_AUTO)
|
|
return 0;
|
|
|
|
/* Verify validity */
|
|
r = sd_id128_from_string(id, &machine_id);
|
|
if (r < 0)
|
|
return log_error_errno(r, "Failed to parse machine ID from %s: %m", p);
|
|
|
|
r = sd_id128_get_machine(&this_id);
|
|
if (r < 0)
|
|
return log_error_errno(r, "Failed to retrieve machine ID: %m");
|
|
|
|
if (sd_id128_equal(machine_id, this_id)) {
|
|
log_full(arg_link_journal == LINK_AUTO ? LOG_WARNING : LOG_ERR,
|
|
"Host and machine ids are equal (%s): refusing to link journals", id);
|
|
if (arg_link_journal == LINK_AUTO)
|
|
return 0;
|
|
return -EEXIST;
|
|
}
|
|
|
|
if (arg_link_journal == LINK_NO)
|
|
return 0;
|
|
|
|
free(p);
|
|
p = strappend("/var/log/journal/", id);
|
|
q = strjoin(directory, "/var/log/journal/", id, NULL);
|
|
if (!p || !q)
|
|
return log_oom();
|
|
|
|
if (path_is_mount_point(p, false) > 0) {
|
|
if (arg_link_journal != LINK_AUTO) {
|
|
log_error("%s: already a mount point, refusing to use for journal", p);
|
|
return -EEXIST;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
if (path_is_mount_point(q, false) > 0) {
|
|
if (arg_link_journal != LINK_AUTO) {
|
|
log_error("%s: already a mount point, refusing to use for journal", q);
|
|
return -EEXIST;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
r = readlink_and_make_absolute(p, &d);
|
|
if (r >= 0) {
|
|
if ((arg_link_journal == LINK_GUEST ||
|
|
arg_link_journal == LINK_AUTO) &&
|
|
path_equal(d, q)) {
|
|
|
|
r = mkdir_p(q, 0755);
|
|
if (r < 0)
|
|
log_warning_errno(errno, "Failed to create directory %s: %m", q);
|
|
return 0;
|
|
}
|
|
|
|
if (unlink(p) < 0)
|
|
return log_error_errno(errno, "Failed to remove symlink %s: %m", p);
|
|
} else if (r == -EINVAL) {
|
|
|
|
if (arg_link_journal == LINK_GUEST &&
|
|
rmdir(p) < 0) {
|
|
|
|
if (errno == ENOTDIR) {
|
|
log_error("%s already exists and is neither a symlink nor a directory", p);
|
|
return r;
|
|
} else {
|
|
log_error_errno(errno, "Failed to remove %s: %m", p);
|
|
return -errno;
|
|
}
|
|
}
|
|
} else if (r != -ENOENT) {
|
|
log_error_errno(errno, "readlink(%s) failed: %m", p);
|
|
return r;
|
|
}
|
|
|
|
if (arg_link_journal == LINK_GUEST) {
|
|
|
|
if (symlink(q, p) < 0) {
|
|
if (arg_link_journal_try) {
|
|
log_debug_errno(errno, "Failed to symlink %s to %s, skipping journal setup: %m", q, p);
|
|
return 0;
|
|
} else {
|
|
log_error_errno(errno, "Failed to symlink %s to %s: %m", q, p);
|
|
return -errno;
|
|
}
|
|
}
|
|
|
|
r = mkdir_p(q, 0755);
|
|
if (r < 0)
|
|
log_warning_errno(errno, "Failed to create directory %s: %m", q);
|
|
return 0;
|
|
}
|
|
|
|
if (arg_link_journal == LINK_HOST) {
|
|
/* don't create parents here -- if the host doesn't have
|
|
* permanent journal set up, don't force it here */
|
|
r = mkdir(p, 0755);
|
|
if (r < 0) {
|
|
if (arg_link_journal_try) {
|
|
log_debug_errno(errno, "Failed to create %s, skipping journal setup: %m", p);
|
|
return 0;
|
|
} else {
|
|
log_error_errno(errno, "Failed to create %s: %m", p);
|
|
return r;
|
|
}
|
|
}
|
|
|
|
} else if (access(p, F_OK) < 0)
|
|
return 0;
|
|
|
|
if (dir_is_empty(q) == 0)
|
|
log_warning("%s is not empty, proceeding anyway.", q);
|
|
|
|
r = mkdir_p(q, 0755);
|
|
if (r < 0) {
|
|
log_error_errno(errno, "Failed to create %s: %m", q);
|
|
return r;
|
|
}
|
|
|
|
if (mount(p, q, "bind", MS_BIND, NULL) < 0)
|
|
return log_error_errno(errno, "Failed to bind mount journal from host into guest: %m");
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int drop_capabilities(void) {
|
|
return capability_bounding_set_drop(~arg_retain, false);
|
|
}
|
|
|
|
static int register_machine(pid_t pid, int local_ifindex) {
|
|
_cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL;
|
|
_cleanup_bus_close_unref_ sd_bus *bus = NULL;
|
|
int r;
|
|
|
|
if (!arg_register)
|
|
return 0;
|
|
|
|
r = sd_bus_default_system(&bus);
|
|
if (r < 0)
|
|
return log_error_errno(r, "Failed to open system bus: %m");
|
|
|
|
if (arg_keep_unit) {
|
|
r = sd_bus_call_method(
|
|
bus,
|
|
"org.freedesktop.machine1",
|
|
"/org/freedesktop/machine1",
|
|
"org.freedesktop.machine1.Manager",
|
|
"RegisterMachineWithNetwork",
|
|
&error,
|
|
NULL,
|
|
"sayssusai",
|
|
arg_machine,
|
|
SD_BUS_MESSAGE_APPEND_ID128(arg_uuid),
|
|
"nspawn",
|
|
"container",
|
|
(uint32_t) pid,
|
|
strempty(arg_directory),
|
|
local_ifindex > 0 ? 1 : 0, local_ifindex);
|
|
} else {
|
|
_cleanup_bus_message_unref_ sd_bus_message *m = NULL;
|
|
|
|
r = sd_bus_message_new_method_call(
|
|
bus,
|
|
&m,
|
|
"org.freedesktop.machine1",
|
|
"/org/freedesktop/machine1",
|
|
"org.freedesktop.machine1.Manager",
|
|
"CreateMachineWithNetwork");
|
|
if (r < 0)
|
|
return log_error_errno(r, "Failed to create message: %m");
|
|
|
|
r = sd_bus_message_append(
|
|
m,
|
|
"sayssusai",
|
|
arg_machine,
|
|
SD_BUS_MESSAGE_APPEND_ID128(arg_uuid),
|
|
"nspawn",
|
|
"container",
|
|
(uint32_t) pid,
|
|
strempty(arg_directory),
|
|
local_ifindex > 0 ? 1 : 0, local_ifindex);
|
|
if (r < 0)
|
|
return log_error_errno(r, "Failed to append message arguments: %m");
|
|
|
|
r = sd_bus_message_open_container(m, 'a', "(sv)");
|
|
if (r < 0)
|
|
return log_error_errno(r, "Failed to open container: %m");
|
|
|
|
if (!isempty(arg_slice)) {
|
|
r = sd_bus_message_append(m, "(sv)", "Slice", "s", arg_slice);
|
|
if (r < 0)
|
|
return log_error_errno(r, "Failed to append slice: %m");
|
|
}
|
|
|
|
r = sd_bus_message_append(m, "(sv)", "DevicePolicy", "s", "strict");
|
|
if (r < 0)
|
|
return log_error_errno(r, "Failed to add device policy: %m");
|
|
|
|
r = sd_bus_message_append(m, "(sv)", "DeviceAllow", "a(ss)", 9,
|
|
/* Allow the container to
|
|
* access and create the API
|
|
* device nodes, so that
|
|
* PrivateDevices= in the
|
|
* container can work
|
|
* fine */
|
|
"/dev/null", "rwm",
|
|
"/dev/zero", "rwm",
|
|
"/dev/full", "rwm",
|
|
"/dev/random", "rwm",
|
|
"/dev/urandom", "rwm",
|
|
"/dev/tty", "rwm",
|
|
"/dev/net/tun", "rwm",
|
|
/* Allow the container
|
|
* access to ptys. However,
|
|
* do not permit the
|
|
* container to ever create
|
|
* these device nodes. */
|
|
"/dev/pts/ptmx", "rw",
|
|
"char-pts", "rw");
|
|
if (r < 0)
|
|
return log_error_errno(r, "Failed to add device whitelist: %m");
|
|
|
|
r = sd_bus_message_close_container(m);
|
|
if (r < 0)
|
|
return log_error_errno(r, "Failed to close container: %m");
|
|
|
|
r = sd_bus_call(bus, m, 0, &error, NULL);
|
|
}
|
|
|
|
if (r < 0) {
|
|
log_error("Failed to register machine: %s", bus_error_message(&error, r));
|
|
return r;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int terminate_machine(pid_t pid) {
|
|
_cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL;
|
|
_cleanup_bus_message_unref_ sd_bus_message *reply = NULL;
|
|
_cleanup_bus_close_unref_ sd_bus *bus = NULL;
|
|
const char *path;
|
|
int r;
|
|
|
|
if (!arg_register)
|
|
return 0;
|
|
|
|
r = sd_bus_default_system(&bus);
|
|
if (r < 0)
|
|
return log_error_errno(r, "Failed to open system bus: %m");
|
|
|
|
r = sd_bus_call_method(
|
|
bus,
|
|
"org.freedesktop.machine1",
|
|
"/org/freedesktop/machine1",
|
|
"org.freedesktop.machine1.Manager",
|
|
"GetMachineByPID",
|
|
&error,
|
|
&reply,
|
|
"u",
|
|
(uint32_t) pid);
|
|
if (r < 0) {
|
|
/* Note that the machine might already have been
|
|
* cleaned up automatically, hence don't consider it a
|
|
* failure if we cannot get the machine object. */
|
|
log_debug("Failed to get machine: %s", bus_error_message(&error, r));
|
|
return 0;
|
|
}
|
|
|
|
r = sd_bus_message_read(reply, "o", &path);
|
|
if (r < 0)
|
|
return bus_log_parse_error(r);
|
|
|
|
r = sd_bus_call_method(
|
|
bus,
|
|
"org.freedesktop.machine1",
|
|
path,
|
|
"org.freedesktop.machine1.Machine",
|
|
"Terminate",
|
|
&error,
|
|
NULL,
|
|
NULL);
|
|
if (r < 0) {
|
|
log_debug("Failed to terminate machine: %s", bus_error_message(&error, r));
|
|
return 0;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int reset_audit_loginuid(void) {
|
|
_cleanup_free_ char *p = NULL;
|
|
int r;
|
|
|
|
if (arg_share_system)
|
|
return 0;
|
|
|
|
r = read_one_line_file("/proc/self/loginuid", &p);
|
|
if (r == -ENOENT)
|
|
return 0;
|
|
if (r < 0)
|
|
return log_error_errno(r, "Failed to read /proc/self/loginuid: %m");
|
|
|
|
/* Already reset? */
|
|
if (streq(p, "4294967295"))
|
|
return 0;
|
|
|
|
r = write_string_file("/proc/self/loginuid", "4294967295");
|
|
if (r < 0) {
|
|
log_error("Failed to reset audit login UID. This probably means that your kernel is too\n"
|
|
"old and you have audit enabled. Note that the auditing subsystem is known to\n"
|
|
"be incompatible with containers on old kernels. Please make sure to upgrade\n"
|
|
"your kernel or to off auditing with 'audit=0' on the kernel command line before\n"
|
|
"using systemd-nspawn. Sleeping for 5s... (%s)\n", strerror(-r));
|
|
|
|
sleep(5);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
#define HOST_HASH_KEY SD_ID128_MAKE(1a,37,6f,c7,46,ec,45,0b,ad,a3,d5,31,06,60,5d,b1)
|
|
#define CONTAINER_HASH_KEY SD_ID128_MAKE(c3,c4,f9,19,b5,57,b2,1c,e6,cf,14,27,03,9c,ee,a2)
|
|
#define MACVLAN_HASH_KEY SD_ID128_MAKE(00,13,6d,bc,66,83,44,81,bb,0c,f9,51,1f,24,a6,6f)
|
|
|
|
static int generate_mac(struct ether_addr *mac, sd_id128_t hash_key, uint64_t idx) {
|
|
uint8_t result[8];
|
|
size_t l, sz;
|
|
uint8_t *v, *i;
|
|
int r;
|
|
|
|
l = strlen(arg_machine);
|
|
sz = sizeof(sd_id128_t) + l;
|
|
if (idx > 0)
|
|
sz += sizeof(idx);
|
|
|
|
v = alloca(sz);
|
|
|
|
/* fetch some persistent data unique to the host */
|
|
r = sd_id128_get_machine((sd_id128_t*) v);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
/* combine with some data unique (on this host) to this
|
|
* container instance */
|
|
i = mempcpy(v + sizeof(sd_id128_t), arg_machine, l);
|
|
if (idx > 0) {
|
|
idx = htole64(idx);
|
|
memcpy(i, &idx, sizeof(idx));
|
|
}
|
|
|
|
/* Let's hash the host machine ID plus the container name. We
|
|
* use a fixed, but originally randomly created hash key here. */
|
|
siphash24(result, v, sz, hash_key.bytes);
|
|
|
|
assert_cc(ETH_ALEN <= sizeof(result));
|
|
memcpy(mac->ether_addr_octet, result, ETH_ALEN);
|
|
|
|
/* see eth_random_addr in the kernel */
|
|
mac->ether_addr_octet[0] &= 0xfe; /* clear multicast bit */
|
|
mac->ether_addr_octet[0] |= 0x02; /* set local assignment bit (IEEE802) */
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int setup_veth(pid_t pid, char iface_name[IFNAMSIZ], int *ifi) {
|
|
_cleanup_rtnl_message_unref_ sd_rtnl_message *m = NULL;
|
|
_cleanup_rtnl_unref_ sd_rtnl *rtnl = NULL;
|
|
struct ether_addr mac_host, mac_container;
|
|
int r, i;
|
|
|
|
if (!arg_private_network)
|
|
return 0;
|
|
|
|
if (!arg_network_veth)
|
|
return 0;
|
|
|
|
/* Use two different interface name prefixes depending whether
|
|
* we are in bridge mode or not. */
|
|
snprintf(iface_name, IFNAMSIZ - 1, "%s-%s",
|
|
arg_network_bridge ? "vb" : "ve", arg_machine);
|
|
|
|
r = generate_mac(&mac_container, CONTAINER_HASH_KEY, 0);
|
|
if (r < 0)
|
|
return log_error_errno(r, "Failed to generate predictable MAC address for container side: %m");
|
|
|
|
r = generate_mac(&mac_host, HOST_HASH_KEY, 0);
|
|
if (r < 0)
|
|
return log_error_errno(r, "Failed to generate predictable MAC address for host side: %m");
|
|
|
|
r = sd_rtnl_open(&rtnl, 0);
|
|
if (r < 0)
|
|
return log_error_errno(r, "Failed to connect to netlink: %m");
|
|
|
|
r = sd_rtnl_message_new_link(rtnl, &m, RTM_NEWLINK, 0);
|
|
if (r < 0)
|
|
return log_error_errno(r, "Failed to allocate netlink message: %m");
|
|
|
|
r = sd_rtnl_message_append_string(m, IFLA_IFNAME, iface_name);
|
|
if (r < 0)
|
|
return log_error_errno(r, "Failed to add netlink interface name: %m");
|
|
|
|
r = sd_rtnl_message_append_ether_addr(m, IFLA_ADDRESS, &mac_host);
|
|
if (r < 0)
|
|
return log_error_errno(r, "Failed to add netlink MAC address: %m");
|
|
|
|
r = sd_rtnl_message_open_container(m, IFLA_LINKINFO);
|
|
if (r < 0)
|
|
return log_error_errno(r, "Failed to open netlink container: %m");
|
|
|
|
r = sd_rtnl_message_open_container_union(m, IFLA_INFO_DATA, "veth");
|
|
if (r < 0)
|
|
return log_error_errno(r, "Failed to open netlink container: %m");
|
|
|
|
r = sd_rtnl_message_open_container(m, VETH_INFO_PEER);
|
|
if (r < 0)
|
|
return log_error_errno(r, "Failed to open netlink container: %m");
|
|
|
|
r = sd_rtnl_message_append_string(m, IFLA_IFNAME, "host0");
|
|
if (r < 0)
|
|
return log_error_errno(r, "Failed to add netlink interface name: %m");
|
|
|
|
r = sd_rtnl_message_append_ether_addr(m, IFLA_ADDRESS, &mac_container);
|
|
if (r < 0)
|
|
return log_error_errno(r, "Failed to add netlink MAC address: %m");
|
|
|
|
r = sd_rtnl_message_append_u32(m, IFLA_NET_NS_PID, pid);
|
|
if (r < 0)
|
|
return log_error_errno(r, "Failed to add netlink namespace field: %m");
|
|
|
|
r = sd_rtnl_message_close_container(m);
|
|
if (r < 0)
|
|
return log_error_errno(r, "Failed to close netlink container: %m");
|
|
|
|
r = sd_rtnl_message_close_container(m);
|
|
if (r < 0)
|
|
return log_error_errno(r, "Failed to close netlink container: %m");
|
|
|
|
r = sd_rtnl_message_close_container(m);
|
|
if (r < 0)
|
|
return log_error_errno(r, "Failed to close netlink container: %m");
|
|
|
|
r = sd_rtnl_call(rtnl, m, 0, NULL);
|
|
if (r < 0)
|
|
return log_error_errno(r, "Failed to add new veth interfaces: %m");
|
|
|
|
i = (int) if_nametoindex(iface_name);
|
|
if (i <= 0)
|
|
return log_error_errno(errno, "Failed to resolve interface %s: %m", iface_name);
|
|
|
|
*ifi = i;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int setup_bridge(const char veth_name[], int *ifi) {
|
|
_cleanup_rtnl_message_unref_ sd_rtnl_message *m = NULL;
|
|
_cleanup_rtnl_unref_ sd_rtnl *rtnl = NULL;
|
|
int r, bridge;
|
|
|
|
if (!arg_private_network)
|
|
return 0;
|
|
|
|
if (!arg_network_veth)
|
|
return 0;
|
|
|
|
if (!arg_network_bridge)
|
|
return 0;
|
|
|
|
bridge = (int) if_nametoindex(arg_network_bridge);
|
|
if (bridge <= 0)
|
|
return log_error_errno(errno, "Failed to resolve interface %s: %m", arg_network_bridge);
|
|
|
|
*ifi = bridge;
|
|
|
|
r = sd_rtnl_open(&rtnl, 0);
|
|
if (r < 0)
|
|
return log_error_errno(r, "Failed to connect to netlink: %m");
|
|
|
|
r = sd_rtnl_message_new_link(rtnl, &m, RTM_SETLINK, 0);
|
|
if (r < 0)
|
|
return log_error_errno(r, "Failed to allocate netlink message: %m");
|
|
|
|
r = sd_rtnl_message_link_set_flags(m, IFF_UP, IFF_UP);
|
|
if (r < 0)
|
|
return log_error_errno(r, "Failed to set IFF_UP flag: %m");
|
|
|
|
r = sd_rtnl_message_append_string(m, IFLA_IFNAME, veth_name);
|
|
if (r < 0)
|
|
return log_error_errno(r, "Failed to add netlink interface name field: %m");
|
|
|
|
r = sd_rtnl_message_append_u32(m, IFLA_MASTER, bridge);
|
|
if (r < 0)
|
|
return log_error_errno(r, "Failed to add netlink master field: %m");
|
|
|
|
r = sd_rtnl_call(rtnl, m, 0, NULL);
|
|
if (r < 0)
|
|
return log_error_errno(r, "Failed to add veth interface to bridge: %m");
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int parse_interface(struct udev *udev, const char *name) {
|
|
_cleanup_udev_device_unref_ struct udev_device *d = NULL;
|
|
char ifi_str[2 + DECIMAL_STR_MAX(int)];
|
|
int ifi;
|
|
|
|
ifi = (int) if_nametoindex(name);
|
|
if (ifi <= 0)
|
|
return log_error_errno(errno, "Failed to resolve interface %s: %m", name);
|
|
|
|
sprintf(ifi_str, "n%i", ifi);
|
|
d = udev_device_new_from_device_id(udev, ifi_str);
|
|
if (!d)
|
|
return log_error_errno(errno, "Failed to get udev device for interface %s: %m", name);
|
|
|
|
if (udev_device_get_is_initialized(d) <= 0) {
|
|
log_error("Network interface %s is not initialized yet.", name);
|
|
return -EBUSY;
|
|
}
|
|
|
|
return ifi;
|
|
}
|
|
|
|
static int move_network_interfaces(pid_t pid) {
|
|
_cleanup_udev_unref_ struct udev *udev = NULL;
|
|
_cleanup_rtnl_unref_ sd_rtnl *rtnl = NULL;
|
|
char **i;
|
|
int r;
|
|
|
|
if (!arg_private_network)
|
|
return 0;
|
|
|
|
if (strv_isempty(arg_network_interfaces))
|
|
return 0;
|
|
|
|
r = sd_rtnl_open(&rtnl, 0);
|
|
if (r < 0)
|
|
return log_error_errno(r, "Failed to connect to netlink: %m");
|
|
|
|
udev = udev_new();
|
|
if (!udev) {
|
|
log_error("Failed to connect to udev.");
|
|
return -ENOMEM;
|
|
}
|
|
|
|
STRV_FOREACH(i, arg_network_interfaces) {
|
|
_cleanup_rtnl_message_unref_ sd_rtnl_message *m = NULL;
|
|
int ifi;
|
|
|
|
ifi = parse_interface(udev, *i);
|
|
if (ifi < 0)
|
|
return ifi;
|
|
|
|
r = sd_rtnl_message_new_link(rtnl, &m, RTM_SETLINK, ifi);
|
|
if (r < 0)
|
|
return log_error_errno(r, "Failed to allocate netlink message: %m");
|
|
|
|
r = sd_rtnl_message_append_u32(m, IFLA_NET_NS_PID, pid);
|
|
if (r < 0)
|
|
return log_error_errno(r, "Failed to append namespace PID to netlink message: %m");
|
|
|
|
r = sd_rtnl_call(rtnl, m, 0, NULL);
|
|
if (r < 0)
|
|
return log_error_errno(r, "Failed to move interface %s to namespace: %m", *i);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int setup_macvlan(pid_t pid) {
|
|
_cleanup_udev_unref_ struct udev *udev = NULL;
|
|
_cleanup_rtnl_unref_ sd_rtnl *rtnl = NULL;
|
|
unsigned idx = 0;
|
|
char **i;
|
|
int r;
|
|
|
|
if (!arg_private_network)
|
|
return 0;
|
|
|
|
if (strv_isempty(arg_network_macvlan))
|
|
return 0;
|
|
|
|
r = sd_rtnl_open(&rtnl, 0);
|
|
if (r < 0)
|
|
return log_error_errno(r, "Failed to connect to netlink: %m");
|
|
|
|
udev = udev_new();
|
|
if (!udev) {
|
|
log_error("Failed to connect to udev.");
|
|
return -ENOMEM;
|
|
}
|
|
|
|
STRV_FOREACH(i, arg_network_macvlan) {
|
|
_cleanup_rtnl_message_unref_ sd_rtnl_message *m = NULL;
|
|
_cleanup_free_ char *n = NULL;
|
|
struct ether_addr mac;
|
|
int ifi;
|
|
|
|
ifi = parse_interface(udev, *i);
|
|
if (ifi < 0)
|
|
return ifi;
|
|
|
|
r = generate_mac(&mac, MACVLAN_HASH_KEY, idx++);
|
|
if (r < 0)
|
|
return log_error_errno(r, "Failed to create MACVLAN MAC address: %m");
|
|
|
|
r = sd_rtnl_message_new_link(rtnl, &m, RTM_NEWLINK, 0);
|
|
if (r < 0)
|
|
return log_error_errno(r, "Failed to allocate netlink message: %m");
|
|
|
|
r = sd_rtnl_message_append_u32(m, IFLA_LINK, ifi);
|
|
if (r < 0)
|
|
return log_error_errno(r, "Failed to add netlink interface index: %m");
|
|
|
|
n = strappend("mv-", *i);
|
|
if (!n)
|
|
return log_oom();
|
|
|
|
strshorten(n, IFNAMSIZ-1);
|
|
|
|
r = sd_rtnl_message_append_string(m, IFLA_IFNAME, n);
|
|
if (r < 0)
|
|
return log_error_errno(r, "Failed to add netlink interface name: %m");
|
|
|
|
r = sd_rtnl_message_append_ether_addr(m, IFLA_ADDRESS, &mac);
|
|
if (r < 0)
|
|
return log_error_errno(r, "Failed to add netlink MAC address: %m");
|
|
|
|
r = sd_rtnl_message_append_u32(m, IFLA_NET_NS_PID, pid);
|
|
if (r < 0)
|
|
return log_error_errno(r, "Failed to add netlink namespace field: %m");
|
|
|
|
r = sd_rtnl_message_open_container(m, IFLA_LINKINFO);
|
|
if (r < 0)
|
|
return log_error_errno(r, "Failed to open netlink container: %m");
|
|
|
|
r = sd_rtnl_message_open_container_union(m, IFLA_INFO_DATA, "macvlan");
|
|
if (r < 0)
|
|
return log_error_errno(r, "Failed to open netlink container: %m");
|
|
|
|
r = sd_rtnl_message_append_u32(m, IFLA_MACVLAN_MODE, MACVLAN_MODE_BRIDGE);
|
|
if (r < 0)
|
|
return log_error_errno(r, "Failed to append macvlan mode: %m");
|
|
|
|
r = sd_rtnl_message_close_container(m);
|
|
if (r < 0)
|
|
return log_error_errno(r, "Failed to close netlink container: %m");
|
|
|
|
r = sd_rtnl_message_close_container(m);
|
|
if (r < 0)
|
|
return log_error_errno(r, "Failed to close netlink container: %m");
|
|
|
|
r = sd_rtnl_call(rtnl, m, 0, NULL);
|
|
if (r < 0)
|
|
return log_error_errno(r, "Failed to add new macvlan interfaces: %m");
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int setup_seccomp(void) {
|
|
|
|
#ifdef HAVE_SECCOMP
|
|
static const int blacklist[] = {
|
|
SCMP_SYS(kexec_load),
|
|
SCMP_SYS(open_by_handle_at),
|
|
SCMP_SYS(init_module),
|
|
SCMP_SYS(finit_module),
|
|
SCMP_SYS(delete_module),
|
|
SCMP_SYS(iopl),
|
|
SCMP_SYS(ioperm),
|
|
SCMP_SYS(swapon),
|
|
SCMP_SYS(swapoff),
|
|
};
|
|
|
|
scmp_filter_ctx seccomp;
|
|
unsigned i;
|
|
int r;
|
|
|
|
seccomp = seccomp_init(SCMP_ACT_ALLOW);
|
|
if (!seccomp)
|
|
return log_oom();
|
|
|
|
r = seccomp_add_secondary_archs(seccomp);
|
|
if (r < 0) {
|
|
log_error_errno(r, "Failed to add secondary archs to seccomp filter: %m");
|
|
goto finish;
|
|
}
|
|
|
|
for (i = 0; i < ELEMENTSOF(blacklist); i++) {
|
|
r = seccomp_rule_add(seccomp, SCMP_ACT_ERRNO(EPERM), blacklist[i], 0);
|
|
if (r == -EFAULT)
|
|
continue; /* unknown syscall */
|
|
if (r < 0) {
|
|
log_error_errno(r, "Failed to block syscall: %m");
|
|
goto finish;
|
|
}
|
|
}
|
|
|
|
/*
|
|
Audit is broken in containers, much of the userspace audit
|
|
hookup will fail if running inside a container. We don't
|
|
care and just turn off creation of audit sockets.
|
|
|
|
This will make socket(AF_NETLINK, *, NETLINK_AUDIT) fail
|
|
with EAFNOSUPPORT which audit userspace uses as indication
|
|
that audit is disabled in the kernel.
|
|
*/
|
|
|
|
r = seccomp_rule_add(
|
|
seccomp,
|
|
SCMP_ACT_ERRNO(EAFNOSUPPORT),
|
|
SCMP_SYS(socket),
|
|
2,
|
|
SCMP_A0(SCMP_CMP_EQ, AF_NETLINK),
|
|
SCMP_A2(SCMP_CMP_EQ, NETLINK_AUDIT));
|
|
if (r < 0) {
|
|
log_error_errno(r, "Failed to add audit seccomp rule: %m");
|
|
goto finish;
|
|
}
|
|
|
|
r = seccomp_attr_set(seccomp, SCMP_FLTATR_CTL_NNP, 0);
|
|
if (r < 0) {
|
|
log_error_errno(r, "Failed to unset NO_NEW_PRIVS: %m");
|
|
goto finish;
|
|
}
|
|
|
|
r = seccomp_load(seccomp);
|
|
if (r < 0)
|
|
log_error_errno(r, "Failed to install seccomp audit filter: %m");
|
|
|
|
finish:
|
|
seccomp_release(seccomp);
|
|
return r;
|
|
#else
|
|
return 0;
|
|
#endif
|
|
|
|
}
|
|
|
|
static int setup_propagate(const char *root) {
|
|
const char *p, *q;
|
|
|
|
(void) mkdir_p("/run/systemd/nspawn/", 0755);
|
|
(void) mkdir_p("/run/systemd/nspawn/propagate", 0600);
|
|
p = strappenda("/run/systemd/nspawn/propagate/", arg_machine);
|
|
(void) mkdir_p(p, 0600);
|
|
|
|
q = strappenda(root, "/run/systemd/nspawn/incoming");
|
|
mkdir_parents(q, 0755);
|
|
mkdir_p(q, 0600);
|
|
|
|
if (mount(p, q, NULL, MS_BIND, NULL) < 0)
|
|
return log_error_errno(errno, "Failed to install propagation bind mount.");
|
|
|
|
if (mount(NULL, q, NULL, MS_BIND|MS_REMOUNT|MS_RDONLY, NULL) < 0)
|
|
return log_error_errno(errno, "Failed to make propagation mount read-only");
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int setup_image(char **device_path, int *loop_nr) {
|
|
struct loop_info64 info = {
|
|
.lo_flags = LO_FLAGS_AUTOCLEAR|LO_FLAGS_PARTSCAN
|
|
};
|
|
_cleanup_close_ int fd = -1, control = -1, loop = -1;
|
|
_cleanup_free_ char* loopdev = NULL;
|
|
struct stat st;
|
|
int r, nr;
|
|
|
|
assert(device_path);
|
|
assert(loop_nr);
|
|
assert(arg_image);
|
|
|
|
fd = open(arg_image, O_CLOEXEC|(arg_read_only ? O_RDONLY : O_RDWR)|O_NONBLOCK|O_NOCTTY);
|
|
if (fd < 0)
|
|
return log_error_errno(errno, "Failed to open %s: %m", arg_image);
|
|
|
|
if (fstat(fd, &st) < 0)
|
|
return log_error_errno(errno, "Failed to stat %s: %m", arg_image);
|
|
|
|
if (S_ISBLK(st.st_mode)) {
|
|
char *p;
|
|
|
|
p = strdup(arg_image);
|
|
if (!p)
|
|
return log_oom();
|
|
|
|
*device_path = p;
|
|
|
|
*loop_nr = -1;
|
|
|
|
r = fd;
|
|
fd = -1;
|
|
|
|
return r;
|
|
}
|
|
|
|
if (!S_ISREG(st.st_mode)) {
|
|
log_error_errno(errno, "%s is not a regular file or block device: %m", arg_image);
|
|
return -EINVAL;
|
|
}
|
|
|
|
control = open("/dev/loop-control", O_RDWR|O_CLOEXEC|O_NOCTTY|O_NONBLOCK);
|
|
if (control < 0)
|
|
return log_error_errno(errno, "Failed to open /dev/loop-control: %m");
|
|
|
|
nr = ioctl(control, LOOP_CTL_GET_FREE);
|
|
if (nr < 0)
|
|
return log_error_errno(errno, "Failed to allocate loop device: %m");
|
|
|
|
if (asprintf(&loopdev, "/dev/loop%i", nr) < 0)
|
|
return log_oom();
|
|
|
|
loop = open(loopdev, O_CLOEXEC|(arg_read_only ? O_RDONLY : O_RDWR)|O_NONBLOCK|O_NOCTTY);
|
|
if (loop < 0)
|
|
return log_error_errno(errno, "Failed to open loop device %s: %m", loopdev);
|
|
|
|
if (ioctl(loop, LOOP_SET_FD, fd) < 0)
|
|
return log_error_errno(errno, "Failed to set loopback file descriptor on %s: %m", loopdev);
|
|
|
|
if (arg_read_only)
|
|
info.lo_flags |= LO_FLAGS_READ_ONLY;
|
|
|
|
if (ioctl(loop, LOOP_SET_STATUS64, &info) < 0)
|
|
return log_error_errno(errno, "Failed to set loopback settings on %s: %m", loopdev);
|
|
|
|
*device_path = loopdev;
|
|
loopdev = NULL;
|
|
|
|
*loop_nr = nr;
|
|
|
|
r = loop;
|
|
loop = -1;
|
|
|
|
return r;
|
|
}
|
|
|
|
static int dissect_image(
|
|
int fd,
|
|
char **root_device, bool *root_device_rw,
|
|
char **home_device, bool *home_device_rw,
|
|
char **srv_device, bool *srv_device_rw,
|
|
bool *secondary) {
|
|
|
|
#ifdef HAVE_BLKID
|
|
int home_nr = -1, srv_nr = -1;
|
|
#ifdef GPT_ROOT_NATIVE
|
|
int root_nr = -1;
|
|
#endif
|
|
#ifdef GPT_ROOT_SECONDARY
|
|
int secondary_root_nr = -1;
|
|
#endif
|
|
|
|
_cleanup_free_ char *home = NULL, *root = NULL, *secondary_root = NULL, *srv = NULL;
|
|
_cleanup_udev_enumerate_unref_ struct udev_enumerate *e = NULL;
|
|
_cleanup_udev_device_unref_ struct udev_device *d = NULL;
|
|
_cleanup_blkid_free_probe_ blkid_probe b = NULL;
|
|
_cleanup_udev_unref_ struct udev *udev = NULL;
|
|
struct udev_list_entry *first, *item;
|
|
bool home_rw = true, root_rw = true, secondary_root_rw = true, srv_rw = true;
|
|
const char *pttype = NULL;
|
|
blkid_partlist pl;
|
|
struct stat st;
|
|
int r;
|
|
|
|
assert(fd >= 0);
|
|
assert(root_device);
|
|
assert(home_device);
|
|
assert(srv_device);
|
|
assert(secondary);
|
|
assert(arg_image);
|
|
|
|
b = blkid_new_probe();
|
|
if (!b)
|
|
return log_oom();
|
|
|
|
errno = 0;
|
|
r = blkid_probe_set_device(b, fd, 0, 0);
|
|
if (r != 0) {
|
|
if (errno == 0)
|
|
return log_oom();
|
|
|
|
log_error_errno(errno, "Failed to set device on blkid probe: %m");
|
|
return -errno;
|
|
}
|
|
|
|
blkid_probe_enable_partitions(b, 1);
|
|
blkid_probe_set_partitions_flags(b, BLKID_PARTS_ENTRY_DETAILS);
|
|
|
|
errno = 0;
|
|
r = blkid_do_safeprobe(b);
|
|
if (r == -2 || r == 1) {
|
|
log_error("Failed to identify any partition table on %s.\n"
|
|
"Note that the disk image needs to follow http://www.freedesktop.org/wiki/Specifications/DiscoverablePartitionsSpec/ to be supported by systemd-nspawn.", arg_image);
|
|
return -EINVAL;
|
|
} else if (r != 0) {
|
|
if (errno == 0)
|
|
errno = EIO;
|
|
log_error_errno(errno, "Failed to probe: %m");
|
|
return -errno;
|
|
}
|
|
|
|
blkid_probe_lookup_value(b, "PTTYPE", &pttype, NULL);
|
|
if (!streq_ptr(pttype, "gpt")) {
|
|
log_error("Image %s does not carry a GUID Partition Table.\n"
|
|
"Note that the disk image needs to follow http://www.freedesktop.org/wiki/Specifications/DiscoverablePartitionsSpec/ to be supported by systemd-nspawn.", arg_image);
|
|
return -EINVAL;
|
|
}
|
|
|
|
errno = 0;
|
|
pl = blkid_probe_get_partitions(b);
|
|
if (!pl) {
|
|
if (errno == 0)
|
|
return log_oom();
|
|
|
|
log_error("Failed to list partitions of %s", arg_image);
|
|
return -errno;
|
|
}
|
|
|
|
udev = udev_new();
|
|
if (!udev)
|
|
return log_oom();
|
|
|
|
if (fstat(fd, &st) < 0)
|
|
return log_error_errno(errno, "Failed to stat block device: %m");
|
|
|
|
d = udev_device_new_from_devnum(udev, 'b', st.st_rdev);
|
|
if (!d)
|
|
return log_oom();
|
|
|
|
e = udev_enumerate_new(udev);
|
|
if (!e)
|
|
return log_oom();
|
|
|
|
r = udev_enumerate_add_match_parent(e, d);
|
|
if (r < 0)
|
|
return log_oom();
|
|
|
|
r = udev_enumerate_scan_devices(e);
|
|
if (r < 0)
|
|
return log_error_errno(r, "Failed to scan for partition devices of %s: %m", arg_image);
|
|
|
|
first = udev_enumerate_get_list_entry(e);
|
|
udev_list_entry_foreach(item, first) {
|
|
_cleanup_udev_device_unref_ struct udev_device *q;
|
|
const char *stype, *node;
|
|
unsigned long long flags;
|
|
sd_id128_t type_id;
|
|
blkid_partition pp;
|
|
dev_t qn;
|
|
int nr;
|
|
|
|
errno = 0;
|
|
q = udev_device_new_from_syspath(udev, udev_list_entry_get_name(item));
|
|
if (!q) {
|
|
if (!errno)
|
|
errno = ENOMEM;
|
|
|
|
log_error_errno(errno, "Failed to get partition device of %s: %m", arg_image);
|
|
return -errno;
|
|
}
|
|
|
|
qn = udev_device_get_devnum(q);
|
|
if (major(qn) == 0)
|
|
continue;
|
|
|
|
if (st.st_rdev == qn)
|
|
continue;
|
|
|
|
node = udev_device_get_devnode(q);
|
|
if (!node)
|
|
continue;
|
|
|
|
pp = blkid_partlist_devno_to_partition(pl, qn);
|
|
if (!pp)
|
|
continue;
|
|
|
|
flags = blkid_partition_get_flags(pp);
|
|
if (flags & GPT_FLAG_NO_AUTO)
|
|
continue;
|
|
|
|
nr = blkid_partition_get_partno(pp);
|
|
if (nr < 0)
|
|
continue;
|
|
|
|
stype = blkid_partition_get_type_string(pp);
|
|
if (!stype)
|
|
continue;
|
|
|
|
if (sd_id128_from_string(stype, &type_id) < 0)
|
|
continue;
|
|
|
|
if (sd_id128_equal(type_id, GPT_HOME)) {
|
|
|
|
if (home && nr >= home_nr)
|
|
continue;
|
|
|
|
home_nr = nr;
|
|
home_rw = !(flags & GPT_FLAG_READ_ONLY);
|
|
|
|
free(home);
|
|
home = strdup(node);
|
|
if (!home)
|
|
return log_oom();
|
|
} else if (sd_id128_equal(type_id, GPT_SRV)) {
|
|
|
|
if (srv && nr >= srv_nr)
|
|
continue;
|
|
|
|
srv_nr = nr;
|
|
srv_rw = !(flags & GPT_FLAG_READ_ONLY);
|
|
|
|
free(srv);
|
|
srv = strdup(node);
|
|
if (!srv)
|
|
return log_oom();
|
|
}
|
|
#ifdef GPT_ROOT_NATIVE
|
|
else if (sd_id128_equal(type_id, GPT_ROOT_NATIVE)) {
|
|
|
|
if (root && nr >= root_nr)
|
|
continue;
|
|
|
|
root_nr = nr;
|
|
root_rw = !(flags & GPT_FLAG_READ_ONLY);
|
|
|
|
free(root);
|
|
root = strdup(node);
|
|
if (!root)
|
|
return log_oom();
|
|
}
|
|
#endif
|
|
#ifdef GPT_ROOT_SECONDARY
|
|
else if (sd_id128_equal(type_id, GPT_ROOT_SECONDARY)) {
|
|
|
|
if (secondary_root && nr >= secondary_root_nr)
|
|
continue;
|
|
|
|
secondary_root_nr = nr;
|
|
secondary_root_rw = !(flags & GPT_FLAG_READ_ONLY);
|
|
|
|
|
|
free(secondary_root);
|
|
secondary_root = strdup(node);
|
|
if (!secondary_root)
|
|
return log_oom();
|
|
}
|
|
#endif
|
|
}
|
|
|
|
if (!root && !secondary_root) {
|
|
log_error("Failed to identify root partition in disk image %s.\n"
|
|
"Note that the disk image needs to follow http://www.freedesktop.org/wiki/Specifications/DiscoverablePartitionsSpec/ to be supported by systemd-nspawn.", arg_image);
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (root) {
|
|
*root_device = root;
|
|
root = NULL;
|
|
|
|
*root_device_rw = root_rw;
|
|
*secondary = false;
|
|
} else if (secondary_root) {
|
|
*root_device = secondary_root;
|
|
secondary_root = NULL;
|
|
|
|
*root_device_rw = secondary_root_rw;
|
|
*secondary = true;
|
|
}
|
|
|
|
if (home) {
|
|
*home_device = home;
|
|
home = NULL;
|
|
|
|
*home_device_rw = home_rw;
|
|
}
|
|
|
|
if (srv) {
|
|
*srv_device = srv;
|
|
srv = NULL;
|
|
|
|
*srv_device_rw = srv_rw;
|
|
}
|
|
|
|
return 0;
|
|
#else
|
|
log_error("--image= is not supported, compiled without blkid support.");
|
|
return -ENOTSUP;
|
|
#endif
|
|
}
|
|
|
|
static int mount_device(const char *what, const char *where, const char *directory, bool rw) {
|
|
#ifdef HAVE_BLKID
|
|
_cleanup_blkid_free_probe_ blkid_probe b = NULL;
|
|
const char *fstype, *p;
|
|
int r;
|
|
|
|
assert(what);
|
|
assert(where);
|
|
|
|
if (arg_read_only)
|
|
rw = false;
|
|
|
|
if (directory)
|
|
p = strappenda(where, directory);
|
|
else
|
|
p = where;
|
|
|
|
errno = 0;
|
|
b = blkid_new_probe_from_filename(what);
|
|
if (!b) {
|
|
if (errno == 0)
|
|
return log_oom();
|
|
log_error_errno(errno, "Failed to allocate prober for %s: %m", what);
|
|
return -errno;
|
|
}
|
|
|
|
blkid_probe_enable_superblocks(b, 1);
|
|
blkid_probe_set_superblocks_flags(b, BLKID_SUBLKS_TYPE);
|
|
|
|
errno = 0;
|
|
r = blkid_do_safeprobe(b);
|
|
if (r == -1 || r == 1) {
|
|
log_error("Cannot determine file system type of %s", what);
|
|
return -EINVAL;
|
|
} else if (r != 0) {
|
|
if (errno == 0)
|
|
errno = EIO;
|
|
log_error_errno(errno, "Failed to probe %s: %m", what);
|
|
return -errno;
|
|
}
|
|
|
|
errno = 0;
|
|
if (blkid_probe_lookup_value(b, "TYPE", &fstype, NULL) < 0) {
|
|
if (errno == 0)
|
|
errno = EINVAL;
|
|
log_error("Failed to determine file system type of %s", what);
|
|
return -errno;
|
|
}
|
|
|
|
if (streq(fstype, "crypto_LUKS")) {
|
|
log_error("nspawn currently does not support LUKS disk images.");
|
|
return -ENOTSUP;
|
|
}
|
|
|
|
if (mount(what, p, fstype, MS_NODEV|(rw ? 0 : MS_RDONLY), NULL) < 0)
|
|
return log_error_errno(errno, "Failed to mount %s: %m", what);
|
|
|
|
return 0;
|
|
#else
|
|
log_error("--image= is not supported, compiled without blkid support.");
|
|
return -ENOTSUP;
|
|
#endif
|
|
}
|
|
|
|
static int mount_devices(
|
|
const char *where,
|
|
const char *root_device, bool root_device_rw,
|
|
const char *home_device, bool home_device_rw,
|
|
const char *srv_device, bool srv_device_rw) {
|
|
int r;
|
|
|
|
assert(where);
|
|
|
|
if (root_device) {
|
|
r = mount_device(root_device, arg_directory, NULL, root_device_rw);
|
|
if (r < 0)
|
|
return log_error_errno(r, "Failed to mount root directory: %m");
|
|
}
|
|
|
|
if (home_device) {
|
|
r = mount_device(home_device, arg_directory, "/home", home_device_rw);
|
|
if (r < 0)
|
|
return log_error_errno(r, "Failed to mount home directory: %m");
|
|
}
|
|
|
|
if (srv_device) {
|
|
r = mount_device(srv_device, arg_directory, "/srv", srv_device_rw);
|
|
if (r < 0)
|
|
return log_error_errno(r, "Failed to mount server data directory: %m");
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void loop_remove(int nr, int *image_fd) {
|
|
_cleanup_close_ int control = -1;
|
|
int r;
|
|
|
|
if (nr < 0)
|
|
return;
|
|
|
|
if (image_fd && *image_fd >= 0) {
|
|
r = ioctl(*image_fd, LOOP_CLR_FD);
|
|
if (r < 0)
|
|
log_warning_errno(errno, "Failed to close loop image: %m");
|
|
*image_fd = safe_close(*image_fd);
|
|
}
|
|
|
|
control = open("/dev/loop-control", O_RDWR|O_CLOEXEC|O_NOCTTY|O_NONBLOCK);
|
|
if (control < 0) {
|
|
log_warning_errno(errno, "Failed to open /dev/loop-control: %m");
|
|
return;
|
|
}
|
|
|
|
r = ioctl(control, LOOP_CTL_REMOVE, nr);
|
|
if (r < 0)
|
|
log_warning_errno(errno, "Failed to remove loop %d: %m", nr);
|
|
}
|
|
|
|
static int spawn_getent(const char *database, const char *key, pid_t *rpid) {
|
|
int pipe_fds[2];
|
|
pid_t pid;
|
|
|
|
assert(database);
|
|
assert(key);
|
|
assert(rpid);
|
|
|
|
if (pipe2(pipe_fds, O_CLOEXEC) < 0)
|
|
return log_error_errno(errno, "Failed to allocate pipe: %m");
|
|
|
|
pid = fork();
|
|
if (pid < 0)
|
|
return log_error_errno(errno, "Failed to fork getent child: %m");
|
|
else if (pid == 0) {
|
|
int nullfd;
|
|
char *empty_env = NULL;
|
|
|
|
if (dup3(pipe_fds[1], STDOUT_FILENO, 0) < 0)
|
|
_exit(EXIT_FAILURE);
|
|
|
|
if (pipe_fds[0] > 2)
|
|
safe_close(pipe_fds[0]);
|
|
if (pipe_fds[1] > 2)
|
|
safe_close(pipe_fds[1]);
|
|
|
|
nullfd = open("/dev/null", O_RDWR);
|
|
if (nullfd < 0)
|
|
_exit(EXIT_FAILURE);
|
|
|
|
if (dup3(nullfd, STDIN_FILENO, 0) < 0)
|
|
_exit(EXIT_FAILURE);
|
|
|
|
if (dup3(nullfd, STDERR_FILENO, 0) < 0)
|
|
_exit(EXIT_FAILURE);
|
|
|
|
if (nullfd > 2)
|
|
safe_close(nullfd);
|
|
|
|
reset_all_signal_handlers();
|
|
close_all_fds(NULL, 0);
|
|
|
|
execle("/usr/bin/getent", "getent", database, key, NULL, &empty_env);
|
|
execle("/bin/getent", "getent", database, key, NULL, &empty_env);
|
|
_exit(EXIT_FAILURE);
|
|
}
|
|
|
|
pipe_fds[1] = safe_close(pipe_fds[1]);
|
|
|
|
*rpid = pid;
|
|
|
|
return pipe_fds[0];
|
|
}
|
|
|
|
static int change_uid_gid(char **_home) {
|
|
char line[LINE_MAX], *x, *u, *g, *h;
|
|
const char *word, *state;
|
|
_cleanup_free_ uid_t *uids = NULL;
|
|
_cleanup_free_ char *home = NULL;
|
|
_cleanup_fclose_ FILE *f = NULL;
|
|
_cleanup_close_ int fd = -1;
|
|
unsigned n_uids = 0;
|
|
size_t sz = 0, l;
|
|
uid_t uid;
|
|
gid_t gid;
|
|
pid_t pid;
|
|
int r;
|
|
|
|
assert(_home);
|
|
|
|
if (!arg_user || streq(arg_user, "root") || streq(arg_user, "0")) {
|
|
/* Reset everything fully to 0, just in case */
|
|
|
|
if (setgroups(0, NULL) < 0)
|
|
return log_error_errno(errno, "setgroups() failed: %m");
|
|
|
|
if (setresgid(0, 0, 0) < 0)
|
|
return log_error_errno(errno, "setregid() failed: %m");
|
|
|
|
if (setresuid(0, 0, 0) < 0)
|
|
return log_error_errno(errno, "setreuid() failed: %m");
|
|
|
|
*_home = NULL;
|
|
return 0;
|
|
}
|
|
|
|
/* First, get user credentials */
|
|
fd = spawn_getent("passwd", arg_user, &pid);
|
|
if (fd < 0)
|
|
return fd;
|
|
|
|
f = fdopen(fd, "r");
|
|
if (!f)
|
|
return log_oom();
|
|
fd = -1;
|
|
|
|
if (!fgets(line, sizeof(line), f)) {
|
|
|
|
if (!ferror(f)) {
|
|
log_error("Failed to resolve user %s.", arg_user);
|
|
return -ESRCH;
|
|
}
|
|
|
|
log_error_errno(errno, "Failed to read from getent: %m");
|
|
return -errno;
|
|
}
|
|
|
|
truncate_nl(line);
|
|
|
|
wait_for_terminate_and_warn("getent passwd", pid, true);
|
|
|
|
x = strchr(line, ':');
|
|
if (!x) {
|
|
log_error("/etc/passwd entry has invalid user field.");
|
|
return -EIO;
|
|
}
|
|
|
|
u = strchr(x+1, ':');
|
|
if (!u) {
|
|
log_error("/etc/passwd entry has invalid password field.");
|
|
return -EIO;
|
|
}
|
|
|
|
u++;
|
|
g = strchr(u, ':');
|
|
if (!g) {
|
|
log_error("/etc/passwd entry has invalid UID field.");
|
|
return -EIO;
|
|
}
|
|
|
|
*g = 0;
|
|
g++;
|
|
x = strchr(g, ':');
|
|
if (!x) {
|
|
log_error("/etc/passwd entry has invalid GID field.");
|
|
return -EIO;
|
|
}
|
|
|
|
*x = 0;
|
|
h = strchr(x+1, ':');
|
|
if (!h) {
|
|
log_error("/etc/passwd entry has invalid GECOS field.");
|
|
return -EIO;
|
|
}
|
|
|
|
h++;
|
|
x = strchr(h, ':');
|
|
if (!x) {
|
|
log_error("/etc/passwd entry has invalid home directory field.");
|
|
return -EIO;
|
|
}
|
|
|
|
*x = 0;
|
|
|
|
r = parse_uid(u, &uid);
|
|
if (r < 0) {
|
|
log_error("Failed to parse UID of user.");
|
|
return -EIO;
|
|
}
|
|
|
|
r = parse_gid(g, &gid);
|
|
if (r < 0) {
|
|
log_error("Failed to parse GID of user.");
|
|
return -EIO;
|
|
}
|
|
|
|
home = strdup(h);
|
|
if (!home)
|
|
return log_oom();
|
|
|
|
/* Second, get group memberships */
|
|
fd = spawn_getent("initgroups", arg_user, &pid);
|
|
if (fd < 0)
|
|
return fd;
|
|
|
|
fclose(f);
|
|
f = fdopen(fd, "r");
|
|
if (!f)
|
|
return log_oom();
|
|
fd = -1;
|
|
|
|
if (!fgets(line, sizeof(line), f)) {
|
|
if (!ferror(f)) {
|
|
log_error("Failed to resolve user %s.", arg_user);
|
|
return -ESRCH;
|
|
}
|
|
|
|
log_error_errno(errno, "Failed to read from getent: %m");
|
|
return -errno;
|
|
}
|
|
|
|
truncate_nl(line);
|
|
|
|
wait_for_terminate_and_warn("getent initgroups", pid, true);
|
|
|
|
/* Skip over the username and subsequent separator whitespace */
|
|
x = line;
|
|
x += strcspn(x, WHITESPACE);
|
|
x += strspn(x, WHITESPACE);
|
|
|
|
FOREACH_WORD(word, l, x, state) {
|
|
char c[l+1];
|
|
|
|
memcpy(c, word, l);
|
|
c[l] = 0;
|
|
|
|
if (!GREEDY_REALLOC(uids, sz, n_uids+1))
|
|
return log_oom();
|
|
|
|
r = parse_uid(c, &uids[n_uids++]);
|
|
if (r < 0) {
|
|
log_error("Failed to parse group data from getent.");
|
|
return -EIO;
|
|
}
|
|
}
|
|
|
|
r = mkdir_parents(home, 0775);
|
|
if (r < 0)
|
|
return log_error_errno(r, "Failed to make home root directory: %m");
|
|
|
|
r = mkdir_safe(home, 0755, uid, gid);
|
|
if (r < 0 && r != -EEXIST)
|
|
return log_error_errno(r, "Failed to make home directory: %m");
|
|
|
|
fchown(STDIN_FILENO, uid, gid);
|
|
fchown(STDOUT_FILENO, uid, gid);
|
|
fchown(STDERR_FILENO, uid, gid);
|
|
|
|
if (setgroups(n_uids, uids) < 0)
|
|
return log_error_errno(errno, "Failed to set auxiliary groups: %m");
|
|
|
|
if (setresgid(gid, gid, gid) < 0)
|
|
return log_error_errno(errno, "setregid() failed: %m");
|
|
|
|
if (setresuid(uid, uid, uid) < 0)
|
|
return log_error_errno(errno, "setreuid() failed: %m");
|
|
|
|
if (_home) {
|
|
*_home = home;
|
|
home = NULL;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Return values:
|
|
* < 0 : wait_for_terminate() failed to get the state of the
|
|
* container, the container was terminated by a signal, or
|
|
* failed for an unknown reason. No change is made to the
|
|
* container argument.
|
|
* > 0 : The program executed in the container terminated with an
|
|
* error. The exit code of the program executed in the
|
|
* container is returned. The container argument has been set
|
|
* to CONTAINER_TERMINATED.
|
|
* 0 : The container is being rebooted, has been shut down or exited
|
|
* successfully. The container argument has been set to either
|
|
* CONTAINER_TERMINATED or CONTAINER_REBOOTED.
|
|
*
|
|
* That is, success is indicated by a return value of zero, and an
|
|
* error is indicated by a non-zero value.
|
|
*/
|
|
static int wait_for_container(pid_t pid, ContainerStatus *container) {
|
|
siginfo_t status;
|
|
int r;
|
|
|
|
r = wait_for_terminate(pid, &status);
|
|
if (r < 0)
|
|
return log_warning_errno(r, "Failed to wait for container: %m");
|
|
|
|
switch (status.si_code) {
|
|
|
|
case CLD_EXITED:
|
|
if (status.si_status == 0) {
|
|
log_full(arg_quiet ? LOG_DEBUG : LOG_INFO, "Container %s exited successfully.", arg_machine);
|
|
|
|
} else
|
|
log_full(arg_quiet ? LOG_DEBUG : LOG_INFO, "Container %s failed with error code %i.", arg_machine, status.si_status);
|
|
|
|
*container = CONTAINER_TERMINATED;
|
|
return status.si_status;
|
|
|
|
case CLD_KILLED:
|
|
if (status.si_status == SIGINT) {
|
|
|
|
log_full(arg_quiet ? LOG_DEBUG : LOG_INFO, "Container %s has been shut down.", arg_machine);
|
|
*container = CONTAINER_TERMINATED;
|
|
return 0;
|
|
|
|
} else if (status.si_status == SIGHUP) {
|
|
|
|
log_full(arg_quiet ? LOG_DEBUG : LOG_INFO, "Container %s is being rebooted.", arg_machine);
|
|
*container = CONTAINER_REBOOTED;
|
|
return 0;
|
|
}
|
|
|
|
/* CLD_KILLED fallthrough */
|
|
|
|
case CLD_DUMPED:
|
|
log_error("Container %s terminated by signal %s.", arg_machine, signal_to_string(status.si_status));
|
|
return -EIO;
|
|
|
|
default:
|
|
log_error("Container %s failed due to unknown reason.", arg_machine);
|
|
return -EIO;
|
|
}
|
|
|
|
return r;
|
|
}
|
|
|
|
static void nop_handler(int sig) {}
|
|
|
|
static int on_orderly_shutdown(sd_event_source *s, const struct signalfd_siginfo *si, void *userdata) {
|
|
pid_t pid;
|
|
|
|
pid = PTR_TO_UINT32(userdata);
|
|
if (pid > 0) {
|
|
if (kill(pid, SIGRTMIN+3) >= 0) {
|
|
log_info("Trying to halt container. Send SIGTERM again to trigger immediate termination.");
|
|
sd_event_source_set_userdata(s, NULL);
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
sd_event_exit(sd_event_source_get_event(s), 0);
|
|
return 0;
|
|
}
|
|
|
|
static int determine_names(void) {
|
|
int r;
|
|
|
|
if (!arg_image && !arg_directory) {
|
|
if (arg_machine) {
|
|
_cleanup_(image_unrefp) Image *i = NULL;
|
|
|
|
r = image_find(arg_machine, &i);
|
|
if (r < 0)
|
|
return log_error_errno(r, "Failed to find image for machine '%s': %m", arg_machine);
|
|
else if (r == 0) {
|
|
log_error("No image for machine '%s': %m", arg_machine);
|
|
return -ENOENT;
|
|
}
|
|
|
|
if (i->type == IMAGE_GPT)
|
|
r = set_sanitized_path(&arg_image, i->path);
|
|
else
|
|
r = set_sanitized_path(&arg_directory, i->path);
|
|
if (r < 0)
|
|
return log_error_errno(r, "Invalid image directory: %m");
|
|
|
|
arg_read_only = arg_read_only || i->read_only;
|
|
} else
|
|
arg_directory = get_current_dir_name();
|
|
|
|
if (!arg_directory && !arg_machine) {
|
|
log_error("Failed to determine path, please use -D or -i.");
|
|
return -EINVAL;
|
|
}
|
|
}
|
|
|
|
if (!arg_machine) {
|
|
if (arg_directory && path_equal(arg_directory, "/"))
|
|
arg_machine = gethostname_malloc();
|
|
else
|
|
arg_machine = strdup(basename(arg_image ?: arg_directory));
|
|
|
|
if (!arg_machine)
|
|
return log_oom();
|
|
|
|
hostname_cleanup(arg_machine, false);
|
|
if (!machine_name_is_valid(arg_machine)) {
|
|
log_error("Failed to determine machine name automatically, please use -M.");
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (arg_ephemeral) {
|
|
char *b;
|
|
|
|
/* Add a random suffix when this is an
|
|
* ephemeral machine, so that we can run many
|
|
* instances at once without manually having
|
|
* to specify -M each time. */
|
|
|
|
if (asprintf(&b, "%s-%016" PRIx64, arg_machine, random_u64()) < 0)
|
|
return log_oom();
|
|
|
|
free(arg_machine);
|
|
arg_machine = b;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
int main(int argc, char *argv[]) {
|
|
|
|
_cleanup_free_ char *device_path = NULL, *root_device = NULL, *home_device = NULL, *srv_device = NULL, *console = NULL;
|
|
bool root_device_rw = true, home_device_rw = true, srv_device_rw = true;
|
|
_cleanup_close_ int master = -1, image_fd = -1;
|
|
_cleanup_fdset_free_ FDSet *fds = NULL;
|
|
int r, n_fd_passed, loop_nr = -1;
|
|
char veth_name[IFNAMSIZ];
|
|
bool secondary = false, remove_subvol = false;
|
|
sigset_t mask, mask_chld;
|
|
pid_t pid = 0;
|
|
int ret = EXIT_SUCCESS;
|
|
union in_addr_union exposed = {};
|
|
_cleanup_release_lock_file_ LockFile tree_global_lock = LOCK_FILE_INIT, tree_local_lock = LOCK_FILE_INIT;
|
|
|
|
log_parse_environment();
|
|
log_open();
|
|
|
|
r = parse_argv(argc, argv);
|
|
if (r <= 0)
|
|
goto finish;
|
|
|
|
r = determine_names();
|
|
if (r < 0)
|
|
goto finish;
|
|
|
|
if (geteuid() != 0) {
|
|
log_error("Need to be root.");
|
|
r = -EPERM;
|
|
goto finish;
|
|
}
|
|
|
|
if (sd_booted() <= 0) {
|
|
log_error("Not running on a systemd system.");
|
|
r = -EINVAL;
|
|
goto finish;
|
|
}
|
|
|
|
log_close();
|
|
n_fd_passed = sd_listen_fds(false);
|
|
if (n_fd_passed > 0) {
|
|
r = fdset_new_listen_fds(&fds, false);
|
|
if (r < 0) {
|
|
log_error_errno(r, "Failed to collect file descriptors: %m");
|
|
goto finish;
|
|
}
|
|
}
|
|
fdset_close_others(fds);
|
|
log_open();
|
|
|
|
if (arg_directory) {
|
|
assert(!arg_image);
|
|
|
|
if (path_equal(arg_directory, "/") && !arg_ephemeral) {
|
|
log_error("Spawning container on root directory is not supported. Consider using --ephemeral.");
|
|
r = -EINVAL;
|
|
goto finish;
|
|
}
|
|
|
|
if (arg_ephemeral) {
|
|
_cleanup_release_lock_file_ LockFile original_lock = LOCK_FILE_INIT;
|
|
char *np;
|
|
|
|
/* If the specified path is a mount point we
|
|
* generate the new snapshot immediately
|
|
* inside it under a random name. However if
|
|
* the specified is not a mount point we
|
|
* create the new snapshot in the parent
|
|
* directory, just next to it. */
|
|
r = path_is_mount_point(arg_directory, false);
|
|
if (r < 0) {
|
|
log_error_errno(r, "Failed to determine whether directory %s is mount point: %m", arg_directory);
|
|
goto finish;
|
|
}
|
|
if (r > 0)
|
|
r = tempfn_random_child(arg_directory, &np);
|
|
else
|
|
r = tempfn_random(arg_directory, &np);
|
|
if (r < 0) {
|
|
log_error_errno(r, "Failed to generate name for snapshot: %m");
|
|
goto finish;
|
|
}
|
|
|
|
r = image_path_lock(np, (arg_read_only ? LOCK_SH : LOCK_EX) | LOCK_NB, &tree_global_lock, &tree_local_lock);
|
|
if (r < 0) {
|
|
log_error_errno(r, "Failed to lock %s: %m", np);
|
|
goto finish;
|
|
}
|
|
|
|
r = btrfs_subvol_snapshot(arg_directory, np, arg_read_only, true);
|
|
if (r < 0) {
|
|
free(np);
|
|
log_error_errno(r, "Failed to create snapshot %s from %s: %m", np, arg_directory);
|
|
goto finish;
|
|
}
|
|
|
|
free(arg_directory);
|
|
arg_directory = np;
|
|
|
|
remove_subvol = true;
|
|
|
|
} else {
|
|
r = image_path_lock(arg_directory, (arg_read_only ? LOCK_SH : LOCK_EX) | LOCK_NB, &tree_global_lock, &tree_local_lock);
|
|
if (r == -EBUSY) {
|
|
log_error_errno(r, "Directory tree %s is currently busy.", arg_directory);
|
|
goto finish;
|
|
}
|
|
if (r < 0) {
|
|
log_error_errno(r, "Failed to lock %s: %m", arg_directory);
|
|
return r;
|
|
}
|
|
|
|
if (arg_template) {
|
|
r = btrfs_subvol_snapshot(arg_template, arg_directory, arg_read_only, true);
|
|
if (r == -EEXIST) {
|
|
if (!arg_quiet)
|
|
log_info("Directory %s already exists, not populating from template %s.", arg_directory, arg_template);
|
|
} else if (r < 0) {
|
|
log_error_errno(r, "Couldn't create snapshort %s from %s: %m", arg_directory, arg_template);
|
|
goto finish;
|
|
} else {
|
|
if (!arg_quiet)
|
|
log_info("Populated %s from template %s.", arg_directory, arg_template);
|
|
}
|
|
}
|
|
}
|
|
|
|
if (arg_boot) {
|
|
if (path_is_os_tree(arg_directory) <= 0) {
|
|
log_error("Directory %s doesn't look like an OS root directory (os-release file is missing). Refusing.", arg_directory);
|
|
r = -EINVAL;
|
|
goto finish;
|
|
}
|
|
} else {
|
|
const char *p;
|
|
|
|
p = strappenda(arg_directory,
|
|
argc > optind && path_is_absolute(argv[optind]) ? argv[optind] : "/usr/bin/");
|
|
if (access(p, F_OK) < 0) {
|
|
log_error("Directory %s lacks the binary to execute or doesn't look like a binary tree. Refusing.", arg_directory);
|
|
r = -EINVAL;
|
|
goto finish;
|
|
}
|
|
}
|
|
|
|
} else {
|
|
char template[] = "/tmp/nspawn-root-XXXXXX";
|
|
|
|
assert(arg_image);
|
|
assert(!arg_template);
|
|
|
|
r = image_path_lock(arg_image, (arg_read_only ? LOCK_SH : LOCK_EX) | LOCK_NB, &tree_global_lock, &tree_local_lock);
|
|
if (r == -EBUSY) {
|
|
r = log_error_errno(r, "Disk image %s is currently busy.", arg_image);
|
|
goto finish;
|
|
}
|
|
if (r < 0) {
|
|
r = log_error_errno(r, "Failed to create image lock: %m");
|
|
goto finish;
|
|
}
|
|
|
|
if (!mkdtemp(template)) {
|
|
log_error_errno(errno, "Failed to create temporary directory: %m");
|
|
r = -errno;
|
|
goto finish;
|
|
}
|
|
|
|
arg_directory = strdup(template);
|
|
if (!arg_directory) {
|
|
r = log_oom();
|
|
goto finish;
|
|
}
|
|
|
|
image_fd = setup_image(&device_path, &loop_nr);
|
|
if (image_fd < 0) {
|
|
r = image_fd;
|
|
goto finish;
|
|
}
|
|
|
|
r = dissect_image(image_fd,
|
|
&root_device, &root_device_rw,
|
|
&home_device, &home_device_rw,
|
|
&srv_device, &srv_device_rw,
|
|
&secondary);
|
|
if (r < 0)
|
|
goto finish;
|
|
}
|
|
|
|
master = posix_openpt(O_RDWR|O_NOCTTY|O_CLOEXEC|O_NDELAY);
|
|
if (master < 0) {
|
|
r = log_error_errno(errno, "Failed to acquire pseudo tty: %m");
|
|
goto finish;
|
|
}
|
|
|
|
r = ptsname_malloc(master, &console);
|
|
if (r < 0) {
|
|
r = log_error_errno(r, "Failed to determine tty name: %m");
|
|
goto finish;
|
|
}
|
|
|
|
if (!arg_quiet)
|
|
log_info("Spawning container %s on %s.\nPress ^] three times within 1s to kill container.",
|
|
arg_machine, arg_image ?: arg_directory);
|
|
|
|
if (unlockpt(master) < 0) {
|
|
r = log_error_errno(errno, "Failed to unlock tty: %m");
|
|
goto finish;
|
|
}
|
|
|
|
assert_se(sigemptyset(&mask) == 0);
|
|
sigset_add_many(&mask, SIGCHLD, SIGWINCH, SIGTERM, SIGINT, -1);
|
|
assert_se(sigprocmask(SIG_BLOCK, &mask, NULL) == 0);
|
|
|
|
assert_se(sigemptyset(&mask_chld) == 0);
|
|
assert_se(sigaddset(&mask_chld, SIGCHLD) == 0);
|
|
|
|
for (;;) {
|
|
_cleanup_close_pair_ int kmsg_socket_pair[2] = { -1, -1 }, rtnl_socket_pair[2] = { -1, -1 };
|
|
ContainerStatus container_status;
|
|
_cleanup_(barrier_destroy) Barrier barrier = BARRIER_NULL;
|
|
struct sigaction sa = {
|
|
.sa_handler = nop_handler,
|
|
.sa_flags = SA_NOCLDSTOP,
|
|
};
|
|
|
|
r = barrier_create(&barrier);
|
|
if (r < 0) {
|
|
log_error_errno(r, "Cannot initialize IPC barrier: %m");
|
|
goto finish;
|
|
}
|
|
|
|
if (socketpair(AF_UNIX, SOCK_DGRAM|SOCK_CLOEXEC, 0, kmsg_socket_pair) < 0) {
|
|
r = log_error_errno(errno, "Failed to create kmsg socket pair: %m");
|
|
goto finish;
|
|
}
|
|
|
|
if (socketpair(AF_UNIX, SOCK_DGRAM|SOCK_CLOEXEC, 0, rtnl_socket_pair) < 0) {
|
|
r = log_error_errno(errno, "Failed to create rtnl socket pair: %m");
|
|
goto finish;
|
|
}
|
|
|
|
/* Child can be killed before execv(), so handle SIGCHLD
|
|
* in order to interrupt parent's blocking calls and
|
|
* give it a chance to call wait() and terminate. */
|
|
r = sigprocmask(SIG_UNBLOCK, &mask_chld, NULL);
|
|
if (r < 0) {
|
|
r = log_error_errno(errno, "Failed to change the signal mask: %m");
|
|
goto finish;
|
|
}
|
|
|
|
r = sigaction(SIGCHLD, &sa, NULL);
|
|
if (r < 0) {
|
|
r = log_error_errno(errno, "Failed to install SIGCHLD handler: %m");
|
|
goto finish;
|
|
}
|
|
|
|
pid = raw_clone(SIGCHLD|CLONE_NEWNS|
|
|
(arg_share_system ? 0 : CLONE_NEWIPC|CLONE_NEWPID|CLONE_NEWUTS)|
|
|
(arg_private_network ? CLONE_NEWNET : 0), NULL);
|
|
if (pid < 0) {
|
|
if (errno == EINVAL)
|
|
r = log_error_errno(errno, "clone() failed, do you have namespace support enabled in your kernel? (You need UTS, IPC, PID and NET namespacing built in): %m");
|
|
else
|
|
r = log_error_errno(errno, "clone() failed: %m");
|
|
|
|
goto finish;
|
|
}
|
|
|
|
if (pid == 0) {
|
|
/* child */
|
|
_cleanup_free_ char *home = NULL;
|
|
unsigned n_env = 2;
|
|
const char *envp[] = {
|
|
"PATH=" DEFAULT_PATH_SPLIT_USR,
|
|
"container=systemd-nspawn", /* LXC sets container=lxc, so follow the scheme here */
|
|
NULL, /* TERM */
|
|
NULL, /* HOME */
|
|
NULL, /* USER */
|
|
NULL, /* LOGNAME */
|
|
NULL, /* container_uuid */
|
|
NULL, /* LISTEN_FDS */
|
|
NULL, /* LISTEN_PID */
|
|
NULL
|
|
};
|
|
char **env_use;
|
|
|
|
barrier_set_role(&barrier, BARRIER_CHILD);
|
|
|
|
envp[n_env] = strv_find_prefix(environ, "TERM=");
|
|
if (envp[n_env])
|
|
n_env ++;
|
|
|
|
master = safe_close(master);
|
|
|
|
close_nointr(STDIN_FILENO);
|
|
close_nointr(STDOUT_FILENO);
|
|
close_nointr(STDERR_FILENO);
|
|
|
|
kmsg_socket_pair[0] = safe_close(kmsg_socket_pair[0]);
|
|
rtnl_socket_pair[0] = safe_close(rtnl_socket_pair[0]);
|
|
|
|
reset_all_signal_handlers();
|
|
reset_signal_mask();
|
|
|
|
r = open_terminal(console, O_RDWR);
|
|
if (r != STDIN_FILENO) {
|
|
if (r >= 0) {
|
|
safe_close(r);
|
|
r = -EINVAL;
|
|
}
|
|
|
|
log_error_errno(r, "Failed to open console: %m");
|
|
_exit(EXIT_FAILURE);
|
|
}
|
|
|
|
if (dup2(STDIN_FILENO, STDOUT_FILENO) != STDOUT_FILENO ||
|
|
dup2(STDIN_FILENO, STDERR_FILENO) != STDERR_FILENO) {
|
|
log_error_errno(errno, "Failed to duplicate console: %m");
|
|
_exit(EXIT_FAILURE);
|
|
}
|
|
|
|
if (setsid() < 0) {
|
|
log_error_errno(errno, "setsid() failed: %m");
|
|
_exit(EXIT_FAILURE);
|
|
}
|
|
|
|
if (reset_audit_loginuid() < 0)
|
|
_exit(EXIT_FAILURE);
|
|
|
|
if (prctl(PR_SET_PDEATHSIG, SIGKILL) < 0) {
|
|
log_error_errno(errno, "PR_SET_PDEATHSIG failed: %m");
|
|
_exit(EXIT_FAILURE);
|
|
}
|
|
|
|
/* Mark everything as slave, so that we still
|
|
* receive mounts from the real root, but don't
|
|
* propagate mounts to the real root. */
|
|
if (mount(NULL, "/", NULL, MS_SLAVE|MS_REC, NULL) < 0) {
|
|
log_error_errno(errno, "MS_SLAVE|MS_REC failed: %m");
|
|
_exit(EXIT_FAILURE);
|
|
}
|
|
|
|
if (mount_devices(arg_directory,
|
|
root_device, root_device_rw,
|
|
home_device, home_device_rw,
|
|
srv_device, srv_device_rw) < 0)
|
|
_exit(EXIT_FAILURE);
|
|
|
|
/* Turn directory into bind mount */
|
|
if (mount(arg_directory, arg_directory, "bind", MS_BIND|MS_REC, NULL) < 0) {
|
|
log_error_errno(errno, "Failed to make bind mount: %m");
|
|
_exit(EXIT_FAILURE);
|
|
}
|
|
|
|
r = setup_volatile(arg_directory);
|
|
if (r < 0)
|
|
_exit(EXIT_FAILURE);
|
|
|
|
if (setup_volatile_state(arg_directory) < 0)
|
|
_exit(EXIT_FAILURE);
|
|
|
|
r = base_filesystem_create(arg_directory);
|
|
if (r < 0)
|
|
_exit(EXIT_FAILURE);
|
|
|
|
if (arg_read_only) {
|
|
r = bind_remount_recursive(arg_directory, true);
|
|
if (r < 0) {
|
|
log_error_errno(r, "Failed to make tree read-only: %m");
|
|
_exit(EXIT_FAILURE);
|
|
}
|
|
}
|
|
|
|
if (mount_all(arg_directory) < 0)
|
|
_exit(EXIT_FAILURE);
|
|
|
|
if (copy_devnodes(arg_directory) < 0)
|
|
_exit(EXIT_FAILURE);
|
|
|
|
if (setup_ptmx(arg_directory) < 0)
|
|
_exit(EXIT_FAILURE);
|
|
|
|
dev_setup(arg_directory);
|
|
|
|
if (setup_propagate(arg_directory) < 0)
|
|
_exit(EXIT_FAILURE);
|
|
|
|
if (setup_seccomp() < 0)
|
|
_exit(EXIT_FAILURE);
|
|
|
|
if (setup_dev_console(arg_directory, console) < 0)
|
|
_exit(EXIT_FAILURE);
|
|
|
|
if (setup_kmsg(arg_directory, kmsg_socket_pair[1]) < 0)
|
|
_exit(EXIT_FAILURE);
|
|
kmsg_socket_pair[1] = safe_close(kmsg_socket_pair[1]);
|
|
|
|
if (send_rtnl(rtnl_socket_pair[1]) < 0)
|
|
_exit(EXIT_FAILURE);
|
|
rtnl_socket_pair[1] = safe_close(rtnl_socket_pair[1]);
|
|
|
|
/* Tell the parent that we are ready, and that
|
|
* it can cgroupify us to that we lack access
|
|
* to certain devices and resources. */
|
|
(void) barrier_place(&barrier);
|
|
|
|
if (setup_boot_id(arg_directory) < 0)
|
|
_exit(EXIT_FAILURE);
|
|
|
|
if (setup_timezone(arg_directory) < 0)
|
|
_exit(EXIT_FAILURE);
|
|
|
|
if (setup_resolv_conf(arg_directory) < 0)
|
|
_exit(EXIT_FAILURE);
|
|
|
|
if (setup_journal(arg_directory) < 0)
|
|
_exit(EXIT_FAILURE);
|
|
|
|
if (mount_binds(arg_directory, arg_bind, false) < 0)
|
|
_exit(EXIT_FAILURE);
|
|
|
|
if (mount_binds(arg_directory, arg_bind_ro, true) < 0)
|
|
_exit(EXIT_FAILURE);
|
|
|
|
if (mount_tmpfs(arg_directory) < 0)
|
|
_exit(EXIT_FAILURE);
|
|
|
|
/* Wait until we are cgroup-ified, so that we
|
|
* can mount the right cgroup path writable */
|
|
(void) barrier_sync_next(&barrier);
|
|
|
|
if (mount_cgroup(arg_directory) < 0)
|
|
_exit(EXIT_FAILURE);
|
|
|
|
if (chdir(arg_directory) < 0) {
|
|
log_error_errno(errno, "chdir(%s) failed: %m", arg_directory);
|
|
_exit(EXIT_FAILURE);
|
|
}
|
|
|
|
if (mount(arg_directory, "/", NULL, MS_MOVE, NULL) < 0) {
|
|
log_error_errno(errno, "mount(MS_MOVE) failed: %m");
|
|
_exit(EXIT_FAILURE);
|
|
}
|
|
|
|
if (chroot(".") < 0) {
|
|
log_error_errno(errno, "chroot() failed: %m");
|
|
_exit(EXIT_FAILURE);
|
|
}
|
|
|
|
if (chdir("/") < 0) {
|
|
log_error_errno(errno, "chdir() failed: %m");
|
|
_exit(EXIT_FAILURE);
|
|
}
|
|
|
|
umask(0022);
|
|
|
|
if (arg_private_network)
|
|
loopback_setup();
|
|
|
|
if (drop_capabilities() < 0) {
|
|
log_error_errno(errno, "drop_capabilities() failed: %m");
|
|
_exit(EXIT_FAILURE);
|
|
}
|
|
|
|
r = change_uid_gid(&home);
|
|
if (r < 0)
|
|
_exit(EXIT_FAILURE);
|
|
|
|
if ((asprintf((char**)(envp + n_env++), "HOME=%s", home ? home: "/root") < 0) ||
|
|
(asprintf((char**)(envp + n_env++), "USER=%s", arg_user ? arg_user : "root") < 0) ||
|
|
(asprintf((char**)(envp + n_env++), "LOGNAME=%s", arg_user ? arg_user : "root") < 0)) {
|
|
log_oom();
|
|
_exit(EXIT_FAILURE);
|
|
}
|
|
|
|
if (!sd_id128_equal(arg_uuid, SD_ID128_NULL)) {
|
|
char as_uuid[37];
|
|
|
|
if (asprintf((char**)(envp + n_env++), "container_uuid=%s", id128_format_as_uuid(arg_uuid, as_uuid)) < 0) {
|
|
log_oom();
|
|
_exit(EXIT_FAILURE);
|
|
}
|
|
}
|
|
|
|
if (fdset_size(fds) > 0) {
|
|
r = fdset_cloexec(fds, false);
|
|
if (r < 0) {
|
|
log_error_errno(r, "Failed to unset O_CLOEXEC for file descriptors.");
|
|
_exit(EXIT_FAILURE);
|
|
}
|
|
|
|
if ((asprintf((char **)(envp + n_env++), "LISTEN_FDS=%u", n_fd_passed) < 0) ||
|
|
(asprintf((char **)(envp + n_env++), "LISTEN_PID=1") < 0)) {
|
|
log_oom();
|
|
_exit(EXIT_FAILURE);
|
|
}
|
|
}
|
|
|
|
setup_hostname();
|
|
|
|
if (arg_personality != 0xffffffffLU) {
|
|
if (personality(arg_personality) < 0) {
|
|
log_error_errno(errno, "personality() failed: %m");
|
|
_exit(EXIT_FAILURE);
|
|
}
|
|
} else if (secondary) {
|
|
if (personality(PER_LINUX32) < 0) {
|
|
log_error_errno(errno, "personality() failed: %m");
|
|
_exit(EXIT_FAILURE);
|
|
}
|
|
}
|
|
|
|
#ifdef HAVE_SELINUX
|
|
if (arg_selinux_context)
|
|
if (setexeccon((security_context_t) arg_selinux_context) < 0) {
|
|
log_error_errno(errno, "setexeccon(\"%s\") failed: %m", arg_selinux_context);
|
|
_exit(EXIT_FAILURE);
|
|
}
|
|
#endif
|
|
|
|
if (!strv_isempty(arg_setenv)) {
|
|
char **n;
|
|
|
|
n = strv_env_merge(2, envp, arg_setenv);
|
|
if (!n) {
|
|
log_oom();
|
|
_exit(EXIT_FAILURE);
|
|
}
|
|
|
|
env_use = n;
|
|
} else
|
|
env_use = (char**) envp;
|
|
|
|
/* Wait until the parent is ready with the setup, too... */
|
|
if (!barrier_place_and_sync(&barrier))
|
|
_exit(EXIT_FAILURE);
|
|
|
|
if (arg_boot) {
|
|
char **a;
|
|
size_t l;
|
|
|
|
/* Automatically search for the init system */
|
|
|
|
l = 1 + argc - optind;
|
|
a = newa(char*, l + 1);
|
|
memcpy(a + 1, argv + optind, l * sizeof(char*));
|
|
|
|
a[0] = (char*) "/usr/lib/systemd/systemd";
|
|
execve(a[0], a, env_use);
|
|
|
|
a[0] = (char*) "/lib/systemd/systemd";
|
|
execve(a[0], a, env_use);
|
|
|
|
a[0] = (char*) "/sbin/init";
|
|
execve(a[0], a, env_use);
|
|
} else if (argc > optind)
|
|
execvpe(argv[optind], argv + optind, env_use);
|
|
else {
|
|
chdir(home ? home : "/root");
|
|
execle("/bin/bash", "-bash", NULL, env_use);
|
|
execle("/bin/sh", "-sh", NULL, env_use);
|
|
}
|
|
|
|
log_error_errno(errno, "execv() failed: %m");
|
|
_exit(EXIT_FAILURE);
|
|
}
|
|
|
|
barrier_set_role(&barrier, BARRIER_PARENT);
|
|
fdset_free(fds);
|
|
fds = NULL;
|
|
|
|
kmsg_socket_pair[1] = safe_close(kmsg_socket_pair[1]);
|
|
rtnl_socket_pair[1] = safe_close(rtnl_socket_pair[1]);
|
|
|
|
/* Wait for the most basic Child-setup to be done,
|
|
* before we add hardware to it, and place it in a
|
|
* cgroup. */
|
|
if (barrier_sync_next(&barrier)) {
|
|
int ifi = 0;
|
|
|
|
r = move_network_interfaces(pid);
|
|
if (r < 0)
|
|
goto finish;
|
|
|
|
r = setup_veth(pid, veth_name, &ifi);
|
|
if (r < 0)
|
|
goto finish;
|
|
|
|
r = setup_bridge(veth_name, &ifi);
|
|
if (r < 0)
|
|
goto finish;
|
|
|
|
r = setup_macvlan(pid);
|
|
if (r < 0)
|
|
goto finish;
|
|
|
|
r = register_machine(pid, ifi);
|
|
if (r < 0)
|
|
goto finish;
|
|
|
|
/* Block SIGCHLD here, before notifying child.
|
|
* process_pty() will handle it with the other signals. */
|
|
r = sigprocmask(SIG_BLOCK, &mask_chld, NULL);
|
|
if (r < 0)
|
|
goto finish;
|
|
|
|
/* Reset signal to default */
|
|
r = default_signals(SIGCHLD, -1);
|
|
if (r < 0)
|
|
goto finish;
|
|
|
|
/* Notify the child that the parent is ready with all
|
|
* its setup, and that the child can now hand over
|
|
* control to the code to run inside the container. */
|
|
(void) barrier_place(&barrier);
|
|
|
|
/* And wait that the child is completely ready now. */
|
|
if (barrier_place_and_sync(&barrier)) {
|
|
_cleanup_event_unref_ sd_event *event = NULL;
|
|
_cleanup_(pty_forward_freep) PTYForward *forward = NULL;
|
|
_cleanup_rtnl_unref_ sd_rtnl *rtnl = NULL;
|
|
char last_char = 0;
|
|
|
|
sd_notify(false,
|
|
"READY=1\n"
|
|
"STATUS=Container running.");
|
|
|
|
r = sd_event_new(&event);
|
|
if (r < 0) {
|
|
log_error_errno(r, "Failed to get default event source: %m");
|
|
goto finish;
|
|
}
|
|
|
|
if (arg_boot) {
|
|
/* Try to kill the init system on SIGINT or SIGTERM */
|
|
sd_event_add_signal(event, NULL, SIGINT, on_orderly_shutdown, UINT32_TO_PTR(pid));
|
|
sd_event_add_signal(event, NULL, SIGTERM, on_orderly_shutdown, UINT32_TO_PTR(pid));
|
|
} else {
|
|
/* Immediately exit */
|
|
sd_event_add_signal(event, NULL, SIGINT, NULL, NULL);
|
|
sd_event_add_signal(event, NULL, SIGTERM, NULL, NULL);
|
|
}
|
|
|
|
/* simply exit on sigchld */
|
|
sd_event_add_signal(event, NULL, SIGCHLD, NULL, NULL);
|
|
|
|
if (arg_expose_ports) {
|
|
r = watch_rtnl(event, rtnl_socket_pair[0], &exposed, &rtnl);
|
|
if (r < 0)
|
|
goto finish;
|
|
|
|
(void) expose_ports(rtnl, &exposed);
|
|
}
|
|
|
|
rtnl_socket_pair[0] = safe_close(rtnl_socket_pair[0]);
|
|
|
|
r = pty_forward_new(event, master, true, &forward);
|
|
if (r < 0) {
|
|
log_error_errno(r, "Failed to create PTY forwarder: %m");
|
|
goto finish;
|
|
}
|
|
|
|
r = sd_event_loop(event);
|
|
if (r < 0) {
|
|
log_error_errno(r, "Failed to run event loop: %m");
|
|
goto finish;
|
|
}
|
|
|
|
pty_forward_get_last_char(forward, &last_char);
|
|
|
|
forward = pty_forward_free(forward);
|
|
|
|
if (!arg_quiet && last_char != '\n')
|
|
putc('\n', stdout);
|
|
|
|
/* Kill if it is not dead yet anyway */
|
|
terminate_machine(pid);
|
|
}
|
|
}
|
|
|
|
/* Normally redundant, but better safe than sorry */
|
|
kill(pid, SIGKILL);
|
|
|
|
r = wait_for_container(pid, &container_status);
|
|
pid = 0;
|
|
|
|
if (r < 0)
|
|
/* We failed to wait for the container, or the
|
|
* container exited abnormally */
|
|
goto finish;
|
|
else if (r > 0 || container_status == CONTAINER_TERMINATED){
|
|
/* The container exited with a non-zero
|
|
* status, or with zero status and no reboot
|
|
* was requested. */
|
|
ret = r;
|
|
break;
|
|
}
|
|
|
|
/* CONTAINER_REBOOTED, loop again */
|
|
|
|
if (arg_keep_unit) {
|
|
/* Special handling if we are running as a
|
|
* service: instead of simply restarting the
|
|
* machine we want to restart the entire
|
|
* service, so let's inform systemd about this
|
|
* with the special exit code 133. The service
|
|
* file uses RestartForceExitStatus=133 so
|
|
* that this results in a full nspawn
|
|
* restart. This is necessary since we might
|
|
* have cgroup parameters set we want to have
|
|
* flushed out. */
|
|
ret = 133;
|
|
r = 0;
|
|
break;
|
|
}
|
|
|
|
flush_ports(&exposed);
|
|
}
|
|
|
|
finish:
|
|
sd_notify(false,
|
|
"STOPPING=1\n"
|
|
"STATUS=Terminating...");
|
|
|
|
loop_remove(loop_nr, &image_fd);
|
|
|
|
if (pid > 0)
|
|
kill(pid, SIGKILL);
|
|
|
|
if (remove_subvol && arg_directory) {
|
|
int k;
|
|
|
|
k = btrfs_subvol_remove(arg_directory);
|
|
if (k < 0)
|
|
log_warning_errno(k, "Cannot remove subvolume '%s', ignoring: %m", arg_directory);
|
|
}
|
|
|
|
if (arg_machine) {
|
|
const char *p;
|
|
|
|
p = strappenda("/run/systemd/nspawn/propagate/", arg_machine);
|
|
(void) rm_rf(p, false, true, false);
|
|
}
|
|
|
|
free(arg_directory);
|
|
free(arg_template);
|
|
free(arg_image);
|
|
free(arg_machine);
|
|
free(arg_user);
|
|
strv_free(arg_setenv);
|
|
strv_free(arg_network_interfaces);
|
|
strv_free(arg_network_macvlan);
|
|
strv_free(arg_bind);
|
|
strv_free(arg_bind_ro);
|
|
strv_free(arg_tmpfs);
|
|
|
|
flush_ports(&exposed);
|
|
|
|
while (arg_expose_ports) {
|
|
ExposePort *p = arg_expose_ports;
|
|
LIST_REMOVE(ports, arg_expose_ports, p);
|
|
free(p);
|
|
}
|
|
|
|
return r < 0 ? EXIT_FAILURE : ret;
|
|
}
|