summaryrefslogtreecommitdiff
path: root/src/resolve/resolved.c
blob: c7e2ab14d64566ade068bd129f26f6c411961e7b (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
/***
  This file is part of systemd.

  Copyright 2014 Tom Gundersen <teg@jklm.no>

  systemd is free software; you can redistribute it and/or modify it
  under the terms of the GNU Lesser General Public License as published by
  the Free Software Foundation; either version 2.1 of the License, or
  (at your option) any later version.

  systemd is distributed in the hope that it will be useful, but
  WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  Lesser General Public License for more details.

  You should have received a copy of the GNU Lesser General Public License
  along with systemd; If not, see <http://www.gnu.org/licenses/>.
***/

#include "sd-daemon.h"
#include "sd-event.h"

#include "capability-util.h"
#include "mkdir.h"
#include "resolved-conf.h"
#include "resolved-manager.h"
#include "resolved-resolv-conf.h"
#include "selinux-util.h"
#include "signal-util.h"
#include "user-util.h"

int main(int argc, char *argv[]) {
        _cleanup_(manager_freep) Manager *m = NULL;
        const char *user = "systemd-resolve";
        uid_t uid;
        gid_t gid;
        int r;

        log_set_target(LOG_TARGET_AUTO);
        log_parse_environment();
        log_open();

        if (argc != 1) {
                log_error("This program takes no arguments.");
                r = -EINVAL;
                goto finish;
        }

        umask(0022);

        r = mac_selinux_init(NULL);
        if (r < 0) {
                log_error_errno(r, "SELinux setup failed: %m");
                goto finish;
        }

        r = get_user_creds(&user, &uid, &gid, NULL, NULL);
        if (r < 0) {
                log_error_errno(r, "Cannot resolve user name %s: %m", user);
                goto finish;
        }

        /* Always create the directory where resolv.conf will live */
        r = mkdir_safe_label("/run/systemd/resolve", 0755, uid, gid);
        if (r < 0) {
                log_error_errno(r, "Could not create runtime directory: %m");
                goto finish;
        }

        r = drop_privileges(uid, gid, 0);
        if (r < 0)
                goto finish;

        assert_se(sigprocmask_many(SIG_BLOCK, NULL, SIGTERM, SIGINT, SIGUSR1, -1) >= 0);

        r = manager_new(&m);
        if (r < 0) {
                log_error_errno(r, "Could not create manager: %m");
                goto finish;
        }

        r = manager_start(m);
        if (r < 0) {
                log_error_errno(r, "Failed to start manager: %m");
                goto finish;
        }

        /* Write finish default resolv.conf to avoid a dangling
         * symlink */
        r = manager_write_resolv_conf(m);
        if (r < 0)
                log_warning_errno(r, "Could not create "PRIVATE_RESOLV_CONF": %m");

        sd_notify(false,
                  "READY=1\n"
                  "STATUS=Processing requests...");

        r = sd_event_loop(m->event);
        if (r < 0) {
                log_error_errno(r, "Event loop failed: %m");
                goto finish;
        }

        sd_event_get_exit_code(m->event, &r);

finish:
        sd_notify(false,
                  "STOPPING=1\n"
                  "STATUS=Shutting down...");

        return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;
}