#include <getopt.h>
#include <pwd.h>
#include <locale.h>
+#include <socket.h>
+#include <fcntl.h>
#include "sd-bus.h"
-
#include "log.h"
#include "util.h"
#include "macro.h"
#include "unit-name.h"
#include "cgroup-show.h"
#include "cgroup-util.h"
+#include "ptyfwd.h"
static char **arg_property = NULL;
static bool arg_all = false;
static bool arg_no_pager = false;
static const char *arg_kill_who = NULL;
static int arg_signal = SIGTERM;
-static enum transport {
- TRANSPORT_LOCAL,
- TRANSPORT_REMOTE,
- TRANSPORT_CONTAINER
-} arg_transport = TRANSPORT_LOCAL;
static bool arg_ask_password = true;
+static BusTransport arg_transport = BUS_TRANSPORT_LOCAL;
static char *arg_host = NULL;
static void pager_open_if_enabled(void) {
assert(bus);
assert(unit);
- if (arg_transport == TRANSPORT_REMOTE)
+ if (arg_transport == BUS_TRANSPORT_REMOTE)
return 0;
path = unit_dbus_path_from_name(unit);
return 0;
}
+static int openpt_in_namespace(pid_t pid, int flags) {
+ _cleanup_close_ int nsfd = -1, rootfd = -1;
+ _cleanup_free_ char *ns = NULL, *root = NULL;
+ _cleanup_close_pipe_ int sock[2] = { -1, -1 };
+ struct msghdr mh;
+ union {
+ struct cmsghdr cmsghdr;
+ uint8_t buf[CMSG_SPACE(sizeof(int))];
+ } control;
+ struct cmsghdr *cmsg;
+ int master, r;
+ pid_t child;
+ siginfo_t si;
+
+ r = asprintf(&ns, "/proc/%lu/ns/mnt", (unsigned long) pid);
+ if (r < 0)
+ return -ENOMEM;
+
+ nsfd = open(ns, O_RDONLY|O_NOCTTY|O_CLOEXEC);
+ if (nsfd < 0)
+ return -errno;
+
+ r = asprintf(&root, "/proc/%lu/root", (unsigned long) pid);
+ if (r < 0)
+ return -ENOMEM;
+
+ rootfd = open(root, O_RDONLY|O_NOCTTY|O_CLOEXEC|O_DIRECTORY);
+ if (rootfd < 0)
+ return -errno;
+
+ if (socketpair(AF_UNIX, SOCK_DGRAM, 0, sock) < 0)
+ return -errno;
+
+ zero(control);
+ zero(mh);
+ mh.msg_control = &control;
+ mh.msg_controllen = sizeof(control);
+
+ child = fork();
+ if (child < 0)
+ return -errno;
+
+ if (child == 0) {
+ close_nointr_nofail(sock[0]);
+ sock[0] = -1;
+
+ r = setns(nsfd, CLONE_NEWNS);
+ if (r < 0)
+ _exit(EXIT_FAILURE);
+
+ if (fchdir(rootfd) < 0)
+ _exit(EXIT_FAILURE);
+
+ if (chroot(".") < 0)
+ _exit(EXIT_FAILURE);
+
+ master = posix_openpt(flags);
+ if (master < 0)
+ _exit(EXIT_FAILURE);
+
+ 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), &master, sizeof(int));
+
+ mh.msg_controllen = cmsg->cmsg_len;
+
+ r = sendmsg(sock[1], &mh, MSG_NOSIGNAL);
+ close_nointr_nofail(master);
+ if (r < 0)
+ _exit(EXIT_FAILURE);
+
+ _exit(EXIT_SUCCESS);
+ }
+
+ close_nointr_nofail(sock[1]);
+ sock[1] = -1;
+
+ if (recvmsg(sock[0], &mh, MSG_NOSIGNAL|MSG_CMSG_CLOEXEC) < 0)
+ return -errno;
+
+ for (cmsg = CMSG_FIRSTHDR(&mh); cmsg; cmsg = CMSG_NXTHDR(&mh, cmsg))
+ if (cmsg->cmsg_level == SOL_SOCKET && cmsg->cmsg_type == SCM_RIGHTS) {
+ int *fds;
+ unsigned n_fds;
+
+ fds = (int*) CMSG_DATA(cmsg);
+ n_fds = (cmsg->cmsg_len - CMSG_LEN(0)) / sizeof(int);
+
+ if (n_fds != 1) {
+ close_many(fds, n_fds);
+ return -EIO;
+ }
+
+ master = fds[0];
+ }
+
+ r = wait_for_terminate(child, &si);
+ if (r < 0 || si.si_code != CLD_EXITED || si.si_status != EXIT_SUCCESS || master < 0) {
+
+ if (master >= 0)
+ close_nointr_nofail(master);
+
+ return r < 0 ? r : -EIO;
+ }
+
+ return master;
+}
+
+static int login_machine(sd_bus *bus, char **args, unsigned n) {
+ _cleanup_bus_message_unref_ sd_bus_message *reply = NULL, *reply2 = NULL, *reply3 = NULL;
+ _cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL;
+ _cleanup_bus_unref_ sd_bus *container_bus = NULL;
+ _cleanup_close_ int master = -1;
+ _cleanup_free_ char *getty = NULL;
+ const char *path, *pty, *p;
+ uint32_t leader;
+ sigset_t mask;
+ int r;
+
+ assert(bus);
+ assert(args);
+
+ if (arg_transport != BUS_TRANSPORT_LOCAL) {
+ log_error("Login only support on local machines.");
+ return -ENOTSUP;
+ }
+
+ r = sd_bus_call_method(
+ bus,
+ "org.freedesktop.machine1",
+ "/org/freedesktop/machine1",
+ "org.freedesktop.machine1.Manager",
+ "GetMachine",
+ &error,
+ &reply,
+ "s", args[1]);
+ if (r < 0) {
+ log_error("Could not get path to machine: %s", bus_error_message(&error, -r));
+ return r;
+ }
+
+ r = sd_bus_message_read(reply, "o", &path);
+ if (r < 0) {
+ log_error("Failed to parse reply: %s", strerror(-r));
+ return r;
+ }
+
+ r = sd_bus_get_property(
+ bus,
+ "org.freedesktop.machine1",
+ path,
+ "org.freedesktop.machine1.Machine",
+ "Leader",
+ &error,
+ &reply2,
+ "u");
+ if (r < 0) {
+ log_error("Failed to retrieve PID of leader: %s", strerror(-r));
+ return r;
+ }
+
+ r = sd_bus_message_read(reply2, "u", &leader);
+ if (r < 0) {
+ log_error("Failed to parse reply: %s", strerror(-r));
+ return r;
+ }
+
+ master = openpt_in_namespace(leader, O_RDWR|O_NOCTTY|O_CLOEXEC|O_NDELAY);
+ if (master < 0) {
+ log_error("Failed to acquire pseudo tty: %s", strerror(-master));
+ return master;
+ }
+
+ pty = ptsname(master);
+ if (!pty) {
+ log_error("Failed to get pty name: %m");
+ return -errno;
+ }
+
+ p = startswith(pty, "/dev/pts/");
+ if (!p) {
+ log_error("Invalid pty name %s.", pty);
+ return -EIO;
+ }
+
+ r = sd_bus_open_system_container(args[1], &container_bus);
+ if (r < 0) {
+ log_error("Failed to get container bus: %s", strerror(-r));
+ return r;
+ }
+
+ getty = strjoin("container-getty@", p, ".service", NULL);
+ if (!getty)
+ return log_oom();
+
+ if (unlockpt(master) < 0) {
+ log_error("Failed to unlock tty: %m");
+ return -errno;
+ }
+
+ r = sd_bus_call_method(container_bus,
+ "org.freedesktop.systemd1",
+ "/org/freedesktop/systemd1",
+ "org.freedesktop.systemd1.Manager",
+ "StartUnit",
+ &error, &reply3,
+ "ss", getty, "replace");
+ if (r < 0) {
+ log_error("Failed to start getty service: %s", bus_error_message(&error, r));
+ return r;
+ }
+
+ assert_se(sigemptyset(&mask) == 0);
+ sigset_add_many(&mask, SIGWINCH, SIGTERM, SIGINT, -1);
+ assert_se(sigprocmask(SIG_BLOCK, &mask, NULL) == 0);
+
+ log_info("Connected to container %s. Press ^] three times within 1s to exit session.", args[1]);
+
+ r = process_pty(master, &mask, 0, 0);
+ if (r < 0) {
+ log_error("Failed to process pseudo tty: %s", strerror(-r));
+ return r;
+ }
+
+ fputc('\n', stdout);
+
+ log_info("Connection to container %s terminated.", args[1]);
+
+ return 0;
+}
+
static int help(void) {
printf("%s [OPTIONS...] {COMMAND} ...\n\n"
" --version Show package version\n"
" --no-pager Do not pipe output into a pager\n"
" --no-ask-password Don't prompt for password\n"
- " -H --host=[USER@]HOST Show information for remote host\n"
- " -M --machine=CONTAINER Show information for local container\n"
+ " -H --host=[USER@]HOST Operate on remote host\n"
+ " -M --machine=CONTAINER Operate on local container\n"
" -p --property=NAME Show only properties by this name\n"
" -a --all Show all properties, including empty ones\n"
" -l --full Do not ellipsize output\n"
" status [NAME...] Show VM/container status\n"
" show [NAME...] Show properties of one or more VMs/containers\n"
" terminate [NAME...] Terminate one or more VMs/containers\n"
- " kill [NAME...] Send signal to processes of a VM/container\n",
+ " kill [NAME...] Send signal to processes of a VM/container\n"
+ " login [NAME] Get a login prompt on a container\n",
program_invocation_short_name);
return 0;
break;
case 'H':
- arg_transport = TRANSPORT_REMOTE;
+ arg_transport = BUS_TRANSPORT_REMOTE;
arg_host = optarg;
break;
case 'M':
- arg_transport = TRANSPORT_CONTAINER;
+ arg_transport = BUS_TRANSPORT_CONTAINER;
arg_host = optarg;
break;
return 1;
}
-static int machinectl_main(sd_bus *bus, int argc, char *argv[], const int r) {
+static int machinectl_main(sd_bus *bus, int argc, char *argv[]) {
static const struct {
const char* verb;
{ "show", MORE, 1, show },
{ "terminate", MORE, 2, terminate_machine },
{ "kill", MORE, 2, kill_machine },
+ { "login", MORE, 2, login_machine },
};
int left;
assert_not_reached("Unknown comparison operator.");
}
- if (r < 0) {
- log_error("Failed to get D-Bus connection: %s", strerror(-r));
- return -EIO;
- }
-
return verbs[i].dispatch(bus, argv + optind, left);
}
goto finish;
}
- if (arg_transport == TRANSPORT_LOCAL)
- r = sd_bus_open_system(&bus);
- else if (arg_transport == TRANSPORT_REMOTE)
- r = sd_bus_open_system_remote(arg_host, &bus);
- else if (arg_transport == TRANSPORT_CONTAINER)
- r = sd_bus_open_system_container(arg_host, &bus);
- else
- assert_not_reached("Uh, invalid transport...");
+ r = bus_open_transport(arg_transport, arg_host, false, &bus);
if (r < 0) {
- log_error("Failed to connect to machined: %s", strerror(-r));
+ log_error("Failed to create bus connection: %s", strerror(-r));
ret = EXIT_FAILURE;
goto finish;
}
- r = machinectl_main(bus, argc, argv, r);
+ r = machinectl_main(bus, argc, argv);
ret = r < 0 ? EXIT_FAILURE : r;
finish: