mirror of
https://github.com/morgan9e/systemd
synced 2026-04-14 16:37:19 +09:00
d7a6bb9891
This tries to get rid of most manual sigprocmask() changes, in favour of: 1. The SD_EVENT_SIGNAL_PROCMASK flag to sd_event_add_signal() 2. The sd_event_set_signal_exit() call for handling SIGTERM/SIGINT 3. Move masking of SIGWINCH into ptyfwd, out of nspawn/vmspawn/run And while we are at it get rid of a bunch of event source fields whose lifetime is bound to the sd_event object they belong to anyway, and make use of the "floating" event source feature of sd-event instead.
98 lines
3.5 KiB
C
98 lines
3.5 KiB
C
/* SPDX-License-Identifier: LGPL-2.1-or-later */
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <unistd.h>
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#include "sd-daemon.h"
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#include "sd-event.h"
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#include "bus-log-control-api.h"
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#include "capability-util.h"
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#include "daemon-util.h"
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#include "main-func.h"
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#include "mkdir-label.h"
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#include "resolved-bus.h"
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#include "resolved-conf.h"
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#include "resolved-manager.h"
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#include "resolved-resolv-conf.h"
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#include "selinux-util.h"
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#include "service-util.h"
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#include "signal-util.h"
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#include "user-util.h"
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static int run(int argc, char *argv[]) {
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_cleanup_(manager_freep) Manager *m = NULL;
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_unused_ _cleanup_(notify_on_cleanup) const char *notify_stop = NULL;
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int r;
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log_setup();
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r = service_parse_argv("systemd-resolved.service",
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"Provide name resolution with caching using DNS, mDNS, LLMNR.",
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BUS_IMPLEMENTATIONS(&manager_object,
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&log_control_object),
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argc, argv);
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if (r <= 0)
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return r;
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umask(0022);
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r = mac_init();
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if (r < 0)
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return r;
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/* Drop privileges, but only if we have been started as root. If we are not running as root we assume most
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* privileges are already dropped and we can't create our directory. */
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if (getuid() == 0) {
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const char *user = "systemd-resolve";
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uid_t uid;
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gid_t gid;
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r = get_user_creds(&user, &uid, &gid, NULL, NULL, 0);
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if (r < 0)
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return log_error_errno(r, "Cannot resolve user name %s: %m", user);
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/* As we're root, we can create the directory where resolv.conf will live */
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r = mkdir_safe_label("/run/systemd/resolve", 0755, uid, gid, MKDIR_WARN_MODE);
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if (r < 0)
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return log_error_errno(r, "Could not create runtime directory: %m");
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/* Drop privileges, but keep three caps. Note that we drop two of those too, later on (see below) */
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r = drop_privileges(uid, gid,
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(UINT64_C(1) << CAP_NET_RAW)| /* needed for SO_BINDTODEVICE */
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(UINT64_C(1) << CAP_NET_BIND_SERVICE)| /* needed to bind on port 53 */
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(UINT64_C(1) << CAP_SETPCAP) /* needed in order to drop the caps later */);
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if (r < 0)
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return log_error_errno(r, "Failed to drop privileges: %m");
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}
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r = manager_new(&m);
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if (r < 0)
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return log_error_errno(r, "Could not create manager: %m");
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r = manager_start(m);
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if (r < 0)
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return log_error_errno(r, "Failed to start manager: %m");
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/* Write finish default resolv.conf to avoid a dangling symlink */
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(void) manager_write_resolv_conf(m);
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(void) manager_check_resolv_conf(m);
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/* Let's drop the remaining caps now */
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r = capability_bounding_set_drop((UINT64_C(1) << CAP_NET_RAW), true);
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if (r < 0)
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return log_error_errno(r, "Failed to drop remaining caps: %m");
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notify_stop = notify_start(NOTIFY_READY, NOTIFY_STOPPING);
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r = sd_event_loop(m->event);
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if (r < 0)
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return log_error_errno(r, "Event loop failed: %m");
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return 0;
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}
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DEFINE_MAIN_FUNCTION(run);
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