summaryrefslogtreecommitdiff
path: root/src/network/sd-network.c
blob: 91d6275056bf3eff87c8abd0124ccb4fac0f0cae (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
298
299
300
301
302
/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/

/***
  This file is part of systemd.

  Copyright 2011 Lennart Poettering
  Copyright 2014 Tom Gundersen

  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 <unistd.h>
#include <string.h>
#include <errno.h>
#include <sys/inotify.h>
#include <sys/poll.h>
#include <net/if.h>

#include "util.h"
#include "macro.h"
#include "strv.h"
#include "fileio.h"
#include "sd-network.h"
#include "network-internal.h"
#include "dhcp-lease-internal.h"

_public_ int sd_network_get_link_state(int ifindex, char **state) {
        _cleanup_free_ char *s = NULL, *p = NULL;
        int r;

        assert_return(ifindex > 0, -EINVAL);
        assert_return(state, -EINVAL);

        if (asprintf(&p, "/run/systemd/netif/links/%d", ifindex) < 0)
                return -ENOMEM;

        r = parse_env_file(p, NEWLINE, "ADMIN_STATE", &s, NULL);
        if (r == -ENOENT)
                return -ENODATA;
        else if (r < 0)
                return r;
        else if (!s)
                return -EIO;

        if (streq(s, "initializing"))
                return -EBUSY;

        *state = s;
        s = NULL;

        return 0;
}

_public_ int sd_network_get_operational_state(char **state) {
        _cleanup_free_ char *s = NULL;
        int r;

        assert_return(state, -EINVAL);

        r = parse_env_file("/run/systemd/netif/state", NEWLINE, "OPER_STATE",
                           &s, NULL);
        if (r == -ENOENT)
                return -ENODATA;
        else if (r < 0)
                return r;
        else if (!s)
                return -EIO;

        *state = s;
        s = NULL;

        return 0;
}

_public_ int sd_network_get_link_operational_state(int ifindex, char **state) {
        _cleanup_free_ char *s = NULL, *p = NULL;
        int r;

        assert_return(ifindex > 0, -EINVAL);
        assert_return(state, -EINVAL);

        if (asprintf(&p, "/run/systemd/netif/links/%d", ifindex) < 0)
                return -ENOMEM;

        r = parse_env_file(p, NEWLINE, "OPER_STATE", &s, NULL);
        if (r == -ENOENT)
                return -ENODATA;
        else if (r < 0)
                return r;
        else if (!s)
                return -EIO;

        *state = s;
        s = NULL;

        return 0;
}

_public_ int sd_network_get_dhcp_lease(int ifindex, sd_dhcp_lease **ret) {
        _cleanup_free_ char *p = NULL, *s = NULL;
        sd_dhcp_lease *lease = NULL;
        int r;

        assert_return(ifindex > 0, -EINVAL);
        assert_return(ret, -EINVAL);

        if (asprintf(&p, "/run/systemd/netif/links/%d", ifindex) < 0)
                return -ENOMEM;

        r = parse_env_file(p, NEWLINE, "DHCP_LEASE", &s, NULL);

        if (r < 0)
                return r;
        else if (!s)
                return -EIO;

        r = dhcp_lease_load(s, &lease);
        if (r < 0)
                return r;

        *ret = lease;

        return 0;
}

static int network_get_in_addr(const char *key, int ifindex, struct in_addr **addr) {
        _cleanup_free_ char *p = NULL, *s = NULL;
        int r;

        assert_return(ifindex > 0, -EINVAL);
        assert_return(addr, -EINVAL);

        if (asprintf(&p, "/run/systemd/netif/links/%d", ifindex) < 0)
                return -ENOMEM;

        r = parse_env_file(p, NEWLINE, key, &s, NULL);
        if (r < 0)
                return r;
        else if (!s)
                return -EIO;

        return deserialize_in_addrs(addr, s);
}

_public_ int sd_network_get_dns(int ifindex, struct in_addr **addr) {
        return network_get_in_addr("DNS", ifindex, addr);
}

static int network_get_in6_addr(const char *key, int ifindex, struct in6_addr **addr) {
        _cleanup_free_ char *p = NULL, *s = NULL;
        int r;

        assert_return(ifindex > 0, -EINVAL);
        assert_return(addr, -EINVAL);

        if (asprintf(&p, "/run/systemd/netif/links/%d", ifindex) < 0)
                return -ENOMEM;

        r = parse_env_file(p, NEWLINE, key, &s, NULL);
        if (r < 0)
                return r;
        else if (!s)
                return -EIO;

        return deserialize_in6_addrs(addr, s);
}

_public_ int sd_network_get_dns6(int ifindex, struct in6_addr **addr) {
        return network_get_in6_addr("DNS", ifindex, addr);
}

static int network_get_boolean(const char *key, int ifindex) {
        _cleanup_free_ char *p = NULL, *s = NULL;
        int r;

        assert_return(ifindex > 0, -EINVAL);

        if (asprintf(&p, "/run/systemd/netif/links/%d", ifindex) < 0)
                return -ENOMEM;

        r = parse_env_file(p, NEWLINE, key, &s, NULL);
        if (r < 0)
                return r;
        else if (!s)
                return false;

        return parse_boolean(s);
}

_public_ int sd_network_dhcp_use_dns(int ifindex) {
        return network_get_boolean("DHCP_USE_DNS", ifindex);
}

_public_ int sd_network_dhcp_use_ntp(int ifindex) {
        return network_get_boolean("DHCP_USE_NTP", ifindex);
}

static inline int MONITOR_TO_FD(sd_network_monitor *m) {
        return (int) (unsigned long) m - 1;
}

static inline sd_network_monitor* FD_TO_MONITOR(int fd) {
        return (sd_network_monitor*) (unsigned long) (fd + 1);
}

_public_ int sd_network_monitor_new(sd_network_monitor **m, const char *category) {
        int fd, k;
        bool good = false;

        assert_return(m, -EINVAL);

        fd = inotify_init1(IN_NONBLOCK|IN_CLOEXEC);
        if (fd < 0)
                return -errno;

        if (!category || streq(category, "links")) {
                k = inotify_add_watch(fd, "/run/systemd/netif/links/", IN_MOVED_TO|IN_DELETE);
                if (k < 0) {
                        safe_close(fd);
                        return -errno;
                }

                good = true;
        }

        if (!category || streq(category, "leases")) {
                k = inotify_add_watch(fd, "/run/systemd/netif/leases/", IN_MOVED_TO|IN_DELETE);
                if (k < 0) {
                        safe_close(fd);
                        return -errno;
                }

                good = true;
        }

        if (!good) {
                close_nointr(fd);
                return -EINVAL;
        }

        *m = FD_TO_MONITOR(fd);
        return 0;
}

_public_ sd_network_monitor* sd_network_monitor_unref(sd_network_monitor *m) {
        int fd;

        assert_return(m, NULL);

        fd = MONITOR_TO_FD(m);
        close_nointr(fd);

        return NULL;
}

_public_ int sd_network_monitor_flush(sd_network_monitor *m) {

        assert_return(m, -EINVAL);

        return flush_fd(MONITOR_TO_FD(m));
}

_public_ int sd_network_monitor_get_fd(sd_network_monitor *m) {

        assert_return(m, -EINVAL);

        return MONITOR_TO_FD(m);
}

_public_ int sd_network_monitor_get_events(sd_network_monitor *m) {

        assert_return(m, -EINVAL);

        /* For now we will only return POLLIN here, since we don't
         * need anything else ever for inotify.  However, let's have
         * this API to keep our options open should we later on need
         * it. */
        return POLLIN;
}

_public_ int sd_network_monitor_get_timeout(sd_network_monitor *m, uint64_t *timeout_usec) {

        assert_return(m, -EINVAL);
        assert_return(timeout_usec, -EINVAL);

        /* For now we will only return (uint64_t) -1, since we don't
         * need any timeout. However, let's have this API to keep our
         * options open should we later on need it. */
        *timeout_usec = (uint64_t) -1;
        return 0;
}