summaryrefslogtreecommitdiff
path: root/src/network/networkd-wait-online.c
blob: a42fef26b99c926ca4f980a317ffda27583d2c53 (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
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/

/***
  This file is part of systemd.

  Copyright 2013 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 <netinet/ether.h>
#include <linux/if.h>
#include <getopt.h>

#include "sd-event.h"
#include "event-util.h"
#include "sd-rtnl.h"
#include "rtnl-util.h"
#include "sd-daemon.h"
#include "sd-network.h"
#include "network-util.h"
#include "network-internal.h"
#include "networkd-wait-online.h"

#include "conf-parser.h"
#include "strv.h"
#include "util.h"
#include "build.h"

static bool arg_quiet = false;
static char **arg_interfaces = NULL;

static int help(void) {

        printf("%s [OPTIONS...]\n\n"
               "Block until network is configured.\n\n"
               "  -h --help                 Show this help\n"
               "     --version              Print version string\n"
               "  -q --quiet                Do not show status information\n"
               "  -i --interface=INTERFACE  Block until at least these interfaces have appeared\n",
               program_invocation_short_name);

        return 0;
}

static int parse_argv(int argc, char *argv[]) {

        enum {
                ARG_VERSION = 0x100,
        };

        static const struct option options[] = {
                { "help",            no_argument,       NULL, 'h'         },
                { "version",         no_argument,       NULL, ARG_VERSION },
                { "quiet",           no_argument,       NULL, 'q'         },
                { "interface",       required_argument, NULL, 'i'         },
                {}
        };

        int c;

        assert(argc >= 0);
        assert(argv);

        while ((c = getopt_long(argc, argv, "+hq", options, NULL)) >= 0) {

                switch (c) {

                case 'h':
                        return help();

                case 'q':
                        arg_quiet = true;
                        break;

                case ARG_VERSION:
                        puts(PACKAGE_STRING);
                        puts(SYSTEMD_FEATURES);
                        return 0;

                case 'i':
                        if (strv_extend(&arg_interfaces, optarg) < 0)
                                return log_oom();

                        break;

                case '?':
                        return -EINVAL;

                default:
                        assert_not_reached("Unhandled option");
                }
        }

        return 1;
}

static bool all_configured(Manager *m) {
        _cleanup_free_ unsigned *indices = NULL;
        char **ifname;
        bool one_ready = false;
        int r, n, i;

        n = sd_network_get_ifindices(&indices);
        if (n <= 0)
                return false;

        /* wait for networkd to be aware of all the links given on the commandline */
        STRV_FOREACH(ifname, arg_interfaces) {
                _cleanup_rtnl_message_unref_ sd_rtnl_message *message = NULL, *reply = NULL;
                bool found = false;
                int index;

                r = sd_rtnl_message_new_link(m->rtnl, &message, RTM_GETLINK, 0);
                if (r < 0) {
                        log_warning("colud not create GETLINK message: %s", strerror(-r));
                        return false;
                }

                r = sd_rtnl_message_append_string(message, IFLA_IFNAME, *ifname);
                if (r < 0) {
                        log_warning("could not attach ifname to GETLINK message: %s", strerror(-r));
                        return false;
                }

                r = sd_rtnl_call(m->rtnl, message, 0, &reply);
                if (r < 0) {
                        if (r != -ENODEV)
                                log_warning("could not get link info for %s: %s", *ifname,
                                            strerror(-r));

                        /* link does not yet exist */
                        return false;
                }

                r = sd_rtnl_message_link_get_ifindex(reply, &index);
                if (r < 0) {
                        log_warning("could not get ifindex: %s", strerror(-r));
                        return false;
                }

                if (index <= 0) {
                        log_warning("invalid ifindex %d for %s", index, *ifname);
                        return false;
                }

                for (i = 0; i < n; i++) {
                        if (indices[i] == (unsigned) index) {
                                found = true;
                                break;
                        }
                }

                if (!found) {
                        /* link exists, but networkd is not yet aware of it */
                        return false;
                }
        }

        /* wait for all links networkd manages to be in admin state 'configured'
           and at least one link to gain a carrier */
        for (i = 0; i < n; i++) {
                _cleanup_free_ char *state = NULL, *oper_state = NULL;

                if (sd_network_link_is_loopback(indices[i]))
                        /* ignore loopback devices */
                        continue;

                r = sd_network_get_link_state(indices[i], &state);
                if (r == -EBUSY || (r >= 0 && !streq(state, "configured")))
                        /* not yet processed by udev, or managed by networkd, but not yet configured */
                        return false;

                r = sd_network_get_link_operational_state(indices[i], &oper_state);
                if (r >= 0 && streq(oper_state, "carrier"))
                        /* we wait for at least one link to be ready,
                           regardless of who manages it */
                        one_ready = true;
        }

        return one_ready;
}

static int monitor_event_handler(sd_event_source *s, int fd, uint32_t revents,
                         void *userdata) {
        Manager *m = userdata;

        assert(m);
        assert(m->event);

        if (all_configured(m))
                sd_event_exit(m->event, 0);

        return 1;
}

void manager_free(Manager *m) {
        if (!m)
                return;

        sd_event_unref(m->event);
        sd_rtnl_unref(m->rtnl);

        free(m);
}

int main(int argc, char *argv[]) {
        _cleanup_manager_free_ Manager *m = NULL;
        _cleanup_event_source_unref_ sd_event_source *event_source = NULL;
        _cleanup_network_monitor_unref_ sd_network_monitor *monitor = NULL;
        int r, fd, events;

        umask(0022);

        log_parse_environment();
        log_open();

        r = parse_argv(argc, argv);
        if (r <= 0)
                return r;

        if (arg_quiet)
                log_set_max_level(LOG_WARNING);

        m = new0(Manager, 1);
        if (!m)
                return log_oom();

        r = sd_network_monitor_new(NULL, &monitor);
        if (r < 0) {
                log_error("Could not create monitor: %s", strerror(-r));
                goto out;
        }

        r = sd_event_new(&m->event);
        if (r < 0) {
                log_error("Could not create event: %s", strerror(-r));
                goto out;
        }

        fd = sd_network_monitor_get_fd(monitor);
        if (fd < 0) {
                log_error("Could not get monitor fd: %s", strerror(-r));
                goto out;
        }

        events = sd_network_monitor_get_events(monitor);
        if (events < 0) {
                log_error("Could not get monitor events: %s", strerror(-r));
                goto out;
        }

        r = sd_event_add_io(m->event, &event_source, fd, events, &monitor_event_handler,
                            m);
        if (r < 0) {
                log_error("Could not add io event source: %s", strerror(-r));
                goto out;
        }

        r = sd_rtnl_open(&m->rtnl, 0);
        if (r < 0) {
                log_error("Could not create rtnl: %s", strerror(-r));
                goto out;
        }

        if (all_configured(m)) {
                r = 0;
                goto out;
        }

        sd_notify(false,
                  "READY=1\n"
                  "STATUS=Waiting for network connections...");

        r = sd_event_loop(m->event);
        if (r < 0) {
                log_error("Event loop failed: %s", strerror(-r));
                goto out;
        }

out:
        sd_notify(false,
                  "STATUS=All interfaces configured...");

        return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;
}