#include "loopback-setup.h"
#include "sd-id128.h"
#include "dev-setup.h"
+#include "fdset.h"
+#include "build.h"
typedef enum LinkJournal {
LINK_NO,
(1ULL << CAP_SYS_PTRACE) |
(1ULL << CAP_SYS_TTY_CONFIG) |
(1ULL << CAP_SYS_RESOURCE) |
- (1ULL << CAP_SYS_BOOT);
+ (1ULL << CAP_SYS_BOOT) |
+ (1ULL << CAP_AUDIT_WRITE) |
+ (1ULL << CAP_AUDIT_CONTROL);
static int help(void) {
printf("%s [OPTIONS...] [PATH] [ARGUMENTS...]\n\n"
"Spawn a minimal namespace container for debugging, testing and building.\n\n"
" -h --help Show this help\n"
+ " --version Print version string\n"
" -D --directory=NAME Root directory for the container\n"
" -b --boot Boot up full system (i.e. invoke init)\n"
" -u --user=USER Run the command under specified user or uid\n"
static int parse_argv(int argc, char *argv[]) {
enum {
- ARG_PRIVATE_NETWORK = 0x100,
+ ARG_VERSION = 0x100,
+ ARG_PRIVATE_NETWORK,
ARG_UUID,
ARG_READ_ONLY,
ARG_CAPABILITY,
static const struct option options[] = {
{ "help", no_argument, NULL, 'h' },
+ { "version", no_argument, NULL, ARG_VERSION },
{ "directory", required_argument, NULL, 'D' },
{ "user", required_argument, NULL, 'u' },
{ "controllers", required_argument, NULL, 'C' },
help();
return 0;
+ case ARG_VERSION:
+ puts(PACKAGE_STRING);
+ puts(SYSTEMD_FEATURES);
+ return 0;
+
case 'D':
free(arg_directory);
arg_directory = canonicalize_file_name(optarg);
}
static int setup_timezone(const char *dest) {
- char *where;
+ _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();
- if (mount("/etc/localtime", where, "bind", MS_BIND, NULL) >= 0)
- mount("/etc/localtime", where, "bind", MS_BIND|MS_REMOUNT|MS_RDONLY, NULL);
+ r = readlink_malloc(where, &q);
+ if (r >= 0) {
+ y = path_startswith(q, "../usr/share/zoneinfo/");
+ if (!y)
+ y = path_startswith(q, "/usr/share/zoneinfo/");
- free(where);
- where = strappend(dest, "/etc/timezone");
- if (!where)
+ /* 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 (mount("/etc/timezone", where, "bind", MS_BIND, NULL) >= 0)
- mount("/etc/timezone", where, "bind", MS_BIND|MS_REMOUNT|MS_RDONLY, NULL);
+ if (access(check, F_OK) < 0) {
+ log_warning("Timezone %s does not exist in container, not updating container timezone.", z);
+ return 0;
+ }
- free(where);
+ what = strappend("../usr/share/zoneinfo/", z);
+ if (!what)
+ return log_oom();
+
+ unlink(where);
+ if (symlink(what, where) < 0) {
+ log_error("Failed to correct timezone of container: %m");
+ return 0;
+ }
return 0;
}
if (!where)
return log_oom();
+ /* We don't really care for the results of this really. If it
+ * fails, it fails, but meh... */
if (mount("/etc/resolv.conf", where, "bind", MS_BIND, NULL) >= 0)
mount("/etc/resolv.conf", where, "bind", MS_BIND|MS_REMOUNT|MS_RDONLY, NULL);
static int setup_journal(const char *directory) {
sd_id128_t machine_id;
- char *p = NULL, *b = NULL, *l, *q = NULL, *d = NULL;
+ char _cleanup_free_ *p = NULL, *b = NULL, *q = NULL, *d = NULL;
+ char *id;
int r;
if (arg_link_journal == LINK_NO)
return 0;
p = strappend(directory, "/etc/machine-id");
- if (!p) {
- r = log_oom();
- goto finish;
- }
+ if (!p)
+ return log_oom();
r = read_one_line_file(p, &b);
- if (r == -ENOENT && arg_link_journal == LINK_AUTO) {
- r = 0;
- goto finish;
- } else if (r < 0) {
- log_error("Failed to read machine ID: %s", strerror(-r));
+ if (r == -ENOENT && arg_link_journal == LINK_AUTO)
+ return 0;
+ else if (r < 0) {
+ log_error("Failed to read machine ID from %s: %s", p, strerror(-r));
return r;
}
- l = strstrip(b);
- if (isempty(l) && arg_link_journal == LINK_AUTO) {
- r = 0;
- goto finish;
- }
+ id = strstrip(b);
+ if (isempty(id) && arg_link_journal == LINK_AUTO)
+ return 0;
- /* Verify validaty */
- r = sd_id128_from_string(l, &machine_id);
+ /* Verify validity */
+ r = sd_id128_from_string(id, &machine_id);
if (r < 0) {
- log_error("Failed to parse machine ID: %s", strerror(-r));
- goto finish;
+ log_error("Failed to parse machine ID from %s: %s", p, strerror(-r));
+ return r;
}
free(p);
- p = strappend("/var/log/journal/", l);
- q = strjoin(directory, "/var/log/journal/", l, NULL);
- if (!p || !q) {
- r = log_oom();
- goto finish;
+ 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(p, false) > 0 ||
- path_is_mount_point(q, false) > 0) {
+ if (path_is_mount_point(q, false) > 0) {
if (arg_link_journal != LINK_AUTO) {
- log_error("Journal already a mount point, refusing.");
- r = -EEXIST;
- goto finish;
+ log_error("%s: already a mount point, refusing to use for journal", q);
+ return -EEXIST;
}
- r = 0;
- goto finish;
+ return 0;
}
r = readlink_and_make_absolute(p, &d);
arg_link_journal == LINK_AUTO) &&
path_equal(d, q)) {
- mkdir_p(q, 0755);
-
- r = 0;
- goto finish;
+ r = mkdir_p(q, 0755);
+ if (r < 0)
+ log_warning("failed to create directory %s: %m", q);
+ return 0;
}
if (unlink(p) < 0) {
log_error("Failed to remove symlink %s: %m", p);
- r = -errno;
- goto finish;
+ return -errno;
}
} else if (r == -EINVAL) {
if (arg_link_journal == LINK_GUEST &&
rmdir(p) < 0) {
- if (errno == ENOTDIR)
- log_error("%s already exists and is neither symlink nor directory.", p);
- else {
+ if (errno == ENOTDIR) {
+ log_error("%s already exists and is neither a symlink nor a directory", p);
+ return r;
+ } else {
log_error("Failed to remove %s: %m", p);
- r = -errno;
+ return -errno;
}
-
- goto finish;
}
} else if (r != -ENOENT) {
log_error("readlink(%s) failed: %m", p);
- goto finish;
+ return r;
}
if (arg_link_journal == LINK_GUEST) {
if (symlink(q, p) < 0) {
log_error("Failed to symlink %s to %s: %m", q, p);
- r = -errno;
- goto finish;
+ return -errno;
}
- mkdir_p(q, 0755);
-
- r = 0;
- goto finish;
+ r = mkdir_p(q, 0755);
+ if (r < 0)
+ log_warning("failed to create directory %s: %m", q);
+ return 0;
}
if (arg_link_journal == LINK_HOST) {
r = mkdir_p(p, 0755);
if (r < 0) {
log_error("Failed to create %s: %m", p);
- goto finish;
+ return r;
}
- } else if (access(p, F_OK) < 0) {
- r = 0;
- goto finish;
- }
+ } else if (access(p, F_OK) < 0)
+ return 0;
if (dir_is_empty(q) == 0) {
log_error("%s not empty.", q);
- r = -ENOTEMPTY;
- goto finish;
+ return -ENOTEMPTY;
}
r = mkdir_p(q, 0755);
if (r < 0) {
log_error("Failed to create %s: %m", q);
- goto finish;
+ return r;
}
if (mount(p, q, "bind", MS_BIND, NULL) < 0) {
log_error("Failed to bind mount journal from host into guest: %m");
- r = -errno;
- goto finish;
+ return -errno;
}
- r = 0;
-
-finish:
- free(p);
- free(q);
- free(d);
- free(b);
- return r;
-
+ return 0;
}
static int drop_capabilities(void) {
return r < 0 ? 0 : 1;
}
-static int process_pty(int master, sigset_t *mask) {
+static int process_pty(int master, pid_t pid, sigset_t *mask) {
char in_buffer[LINE_MAX], out_buffer[LINE_MAX];
size_t in_buffer_full = 0, out_buffer_full = 0;
struct epoll_event stdin_ev, stdout_ev, master_ev, signal_ev;
bool stdin_readable = false, stdout_writable = false, master_readable = false, master_writable = false;
int ep = -1, signal_fd = -1, r;
+ bool tried_orderly_shutdown = false;
+
+ assert(master >= 0);
+ assert(pid > 0);
+ assert(mask);
fd_nonblock(STDIN_FILENO, 1);
fd_nonblock(STDOUT_FILENO, 1);
goto finish;
}
- zero(stdin_ev);
- stdin_ev.events = EPOLLIN|EPOLLET;
- stdin_ev.data.fd = STDIN_FILENO;
+ /* We read from STDIN only if this is actually a TTY,
+ * otherwise we assume non-interactivity. */
+ if (isatty(STDIN_FILENO)) {
+ zero(stdin_ev);
+ stdin_ev.events = EPOLLIN|EPOLLET;
+ stdin_ev.data.fd = STDIN_FILENO;
+
+ if (epoll_ctl(ep, EPOLL_CTL_ADD, STDIN_FILENO, &stdin_ev) < 0) {
+ log_error("Failed to register STDIN in epoll: %m");
+ r = -errno;
+ goto finish;
+ }
+ }
zero(stdout_ev);
stdout_ev.events = EPOLLOUT|EPOLLET;
signal_ev.events = EPOLLIN;
signal_ev.data.fd = signal_fd;
- if (epoll_ctl(ep, EPOLL_CTL_ADD, STDIN_FILENO, &stdin_ev) < 0 ||
- epoll_ctl(ep, EPOLL_CTL_ADD, STDOUT_FILENO, &stdout_ev) < 0 ||
- epoll_ctl(ep, EPOLL_CTL_ADD, master, &master_ev) < 0 ||
+ if (epoll_ctl(ep, EPOLL_CTL_ADD, STDOUT_FILENO, &stdout_ev) < 0) {
+ if (errno != EPERM) {
+ log_error("Failed to register stdout in epoll: %m");
+ r = -errno;
+ goto finish;
+ }
+ /* stdout without epoll support. Likely redirected to regular file. */
+ stdout_writable = true;
+ }
+
+ if (epoll_ctl(ep, EPOLL_CTL_ADD, master, &master_ev) < 0 ||
epoll_ctl(ep, EPOLL_CTL_ADD, signal_fd, &signal_ev) < 0) {
- log_error("Failed to regiser fds in epoll: %m");
+ log_error("Failed to register fds in epoll: %m");
r = -errno;
goto finish;
}
/* The window size changed, let's forward that. */
if (ioctl(STDIN_FILENO, TIOCGWINSZ, &ws) >= 0)
ioctl(master, TIOCSWINSZ, &ws);
+ } else if (sfsi.ssi_signo == SIGTERM && arg_boot && !tried_orderly_shutdown) {
+
+ log_info("Trying to halt container. Send SIGTERM again to trigger immediate termination.");
+
+ /* This only works for systemd... */
+ tried_orderly_shutdown = true;
+ kill(pid, SIGRTMIN+3);
+
} else {
r = 0;
goto finish;
int r = EXIT_FAILURE, k;
char *oldcg = NULL, *newcg = NULL;
char **controller = NULL;
- int master = -1;
+ int master = -1, n_fd_passed;
const char *console = NULL;
struct termios saved_attr, raw_attr;
sigset_t mask;
bool saved_attr_valid = false;
struct winsize ws;
int kmsg_socket_pair[2] = { -1, -1 };
+ FDSet *fds = NULL;
log_parse_environment();
log_open();
goto finish;
}
+ log_close();
+ n_fd_passed = sd_listen_fds(false);
+ if (n_fd_passed > 0) {
+ k = fdset_new_listen_fds(&fds, false);
+ if (k < 0) {
+ log_error("Failed to collect file descriptors: %s", strerror(-k));
+ goto finish;
+ }
+ }
+ fdset_close_others(fds);
+ log_open();
+
k = cg_get_by_pid(SYSTEMD_CGROUP_CONTROLLER, 0, &oldcg);
if (k < 0) {
log_error("Failed to determine current cgroup: %s", strerror(-k));
goto finish;
}
- if (tcgetattr(STDIN_FILENO, &saved_attr) < 0) {
- log_error("Failed to get terminal attributes: %m");
- goto finish;
- }
-
- saved_attr_valid = true;
+ if (tcgetattr(STDIN_FILENO, &saved_attr) >= 0) {
+ saved_attr_valid = true;
- raw_attr = saved_attr;
- cfmakeraw(&raw_attr);
- raw_attr.c_lflag &= ~ECHO;
+ raw_attr = saved_attr;
+ cfmakeraw(&raw_attr);
+ raw_attr.c_lflag &= ~ECHO;
+ }
if (socketpair(AF_UNIX, SOCK_DGRAM|SOCK_NONBLOCK|SOCK_CLOEXEC, 0, kmsg_socket_pair) < 0) {
log_error("Failed to create kmsg socket pair");
for (;;) {
siginfo_t status;
- if (tcsetattr(STDIN_FILENO, TCSANOW, &raw_attr) < 0) {
- log_error("Failed to set terminal attributes: %m");
- goto finish;
+ if (saved_attr_valid) {
+ if (tcsetattr(STDIN_FILENO, TCSANOW, &raw_attr) < 0) {
+ log_error("Failed to set terminal attributes: %m");
+ goto finish;
+ }
}
pid = syscall(__NR_clone, SIGCHLD|CLONE_NEWIPC|CLONE_NEWNS|CLONE_NEWPID|CLONE_NEWUTS|(arg_private_network ? CLONE_NEWNET : 0), NULL);
const char *home = NULL;
uid_t uid = (uid_t) -1;
gid_t gid = (gid_t) -1;
+ unsigned n_env = 0;
const char *envp[] = {
"PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin",
"container=systemd-nspawn", /* LXC sets container=lxc, so follow the scheme here */
NULL, /* USER */
NULL, /* LOGNAME */
NULL, /* container_uuid */
+ NULL, /* LISTEN_FDS */
+ NULL, /* LISTEN_PID */
NULL
};
envp[2] = strv_find_prefix(environ, "TERM=");
+ n_env = 3;
close_nointr_nofail(master);
+ master = -1;
close_nointr(STDIN_FILENO);
close_nointr(STDOUT_FILENO);
close_nointr(STDERR_FILENO);
- close_all_fds(&kmsg_socket_pair[1], 1);
+ close_nointr_nofail(kmsg_socket_pair[0]);
+ kmsg_socket_pair[0] = -1;
reset_all_signal_handlers();
assert_se(sigemptyset(&mask) == 0);
assert_se(sigprocmask(SIG_SETMASK, &mask, NULL) == 0);
- if (open_terminal(console, O_RDWR) != STDIN_FILENO ||
- dup2(STDIN_FILENO, STDOUT_FILENO) != STDOUT_FILENO ||
- dup2(STDIN_FILENO, STDERR_FILENO) != STDERR_FILENO)
+ k = open_terminal(console, O_RDWR);
+ if (k != STDIN_FILENO) {
+ if (k >= 0) {
+ close_nointr_nofail(k);
+ k = -EINVAL;
+ }
+
+ log_error("Failed to open console: %s", strerror(-k));
goto child_fail;
+ }
+
+ if (dup2(STDIN_FILENO, STDOUT_FILENO) != STDOUT_FILENO ||
+ dup2(STDIN_FILENO, STDERR_FILENO) != STDERR_FILENO) {
+ log_error("Failed to duplicate console: %m");
+ goto child_fail;
+ }
if (setsid() < 0) {
log_error("setsid() failed: %m");
goto child_fail;
close_nointr_nofail(kmsg_socket_pair[1]);
+ kmsg_socket_pair[1] = -1;
if (setup_boot_id(arg_directory) < 0)
goto child_fail;
if (arg_user) {
+ /* Note that this resolves user names
+ * inside the container, and hence
+ * accesses the NSS modules from the
+ * container and not the host. This is
+ * a bit weird... */
+
if (get_user_creds((const char**)&arg_user, &uid, &gid, &home, NULL) < 0) {
log_error("get_user_creds() failed: %m");
goto child_fail;
log_error("setreuid() failed: %m");
goto child_fail;
}
+ } else {
+ /* Reset everything fully to 0, just in case */
+
+ if (setgroups(0, NULL) < 0) {
+ log_error("setgroups() failed: %m");
+ goto child_fail;
+ }
+
+ if (setresgid(0, 0, 0) < 0) {
+ log_error("setregid() failed: %m");
+ goto child_fail;
+ }
+
+ if (setresuid(0, 0, 0) < 0) {
+ log_error("setreuid() failed: %m");
+ goto child_fail;
+ }
}
- if ((asprintf((char**)(envp + 3), "HOME=%s", home ? home: "/root") < 0) ||
- (asprintf((char**)(envp + 4), "USER=%s", arg_user ? arg_user : "root") < 0) ||
- (asprintf((char**)(envp + 5), "LOGNAME=%s", arg_user ? arg_user : "root") < 0)) {
+ 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();
goto child_fail;
}
if (arg_uuid) {
- if (asprintf((char**)(envp + 6), "container_uuid=%s", arg_uuid) < 0) {
+ if (asprintf((char**)(envp + n_env++), "container_uuid=%s", arg_uuid) < 0) {
+ log_oom();
+ goto child_fail;
+ }
+ }
+
+ if (fdset_size(fds) > 0) {
+ k = fdset_cloexec(fds, false);
+ if (k < 0) {
+ log_error("Failed to unset O_CLOEXEC for file descriptors.");
+ goto child_fail;
+ }
+
+ if ((asprintf((char **)(envp + n_env++), "LISTEN_FDS=%u", n_fd_passed) < 0) ||
+ (asprintf((char **)(envp + n_env++), "LISTEN_PID=%lu", (unsigned long) getpid()) < 0)) {
log_oom();
goto child_fail;
}
_exit(EXIT_FAILURE);
}
- if (process_pty(master, &mask) < 0)
- goto finish;
+ fdset_free(fds);
+ fds = NULL;
+ if (process_pty(master, pid, &mask) < 0)
+ goto finish;
if (saved_attr_valid)
tcsetattr(STDIN_FILENO, TCSANOW, &saved_attr);
free(oldcg);
free(newcg);
+ fdset_free(fds);
+
return r;
}
~ianmdlvl / elogind.git / blobdiff