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1 | /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ |
2 | ||
3 | /*** | |
4 | This file is part of systemd. | |
5 | ||
6 | Copyright 2011 Lennart Poettering | |
7 | Copyright 2014 Tom Gundersen | |
8 | ||
9 | systemd is free software; you can redistribute it and/or modify it | |
10 | under the terms of the GNU Lesser General Public License as published by | |
11 | the Free Software Foundation; either version 2.1 of the License, or | |
12 | (at your option) any later version. | |
13 | ||
14 | systemd is distributed in the hope that it will be useful, but | |
15 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
17 | Lesser General Public License for more details. | |
18 | ||
19 | You should have received a copy of the GNU Lesser General Public License | |
20 | along with systemd; If not, see <http://www.gnu.org/licenses/>. | |
21 | ***/ | |
22 | ||
23 | #include <unistd.h> | |
24 | #include <string.h> | |
25 | #include <errno.h> | |
26 | #include <sys/inotify.h> | |
27 | #include <sys/poll.h> | |
28 | ||
29 | #include "util.h" | |
30 | #include "macro.h" | |
31 | #include "strv.h" | |
32 | #include "fileio.h" | |
33 | #include "sd-network.h" | |
34 | #include "dhcp-lease-internal.h" | |
35 | ||
36 | _public_ int sd_network_get_link_state(unsigned index, char **state) { | |
37 | char *p, *s = NULL; | |
38 | int r; | |
39 | ||
40 | assert_return(index, -EINVAL); | |
41 | assert_return(state, -EINVAL); | |
42 | ||
43 | if (asprintf(&p, "/run/systemd/network/links/%u", index) < 0) | |
44 | return -ENOMEM; | |
45 | ||
46 | r = parse_env_file(p, NEWLINE, "STATE", &s, NULL); | |
47 | free(p); | |
48 | ||
49 | if (r == -ENOENT) { | |
50 | free(s); | |
51 | s = strdup("unknown"); | |
52 | if (!s) | |
53 | return -ENOMEM; | |
54 | ||
55 | *state = s; | |
56 | return 0; | |
57 | } else if (r < 0) { | |
58 | free(s); | |
59 | return r; | |
60 | } else if (!s) | |
61 | return -EIO; | |
62 | ||
63 | *state = s; | |
64 | return 0; | |
65 | } | |
66 | ||
67 | _public_ int sd_network_get_dhcp_lease(unsigned index, sd_dhcp_lease **ret) { | |
68 | sd_dhcp_lease *lease; | |
69 | char *p, *s = NULL; | |
70 | int r; | |
71 | ||
72 | assert_return(index, -EINVAL); | |
73 | assert_return(ret, -EINVAL); | |
74 | ||
75 | if (asprintf(&p, "/run/systemd/network/links/%u", index) < 0) | |
76 | return -ENOMEM; | |
77 | ||
78 | r = parse_env_file(p, NEWLINE, "DHCP_LEASE", &s, NULL); | |
79 | free(p); | |
80 | ||
81 | if (r < 0) { | |
82 | free(s); | |
83 | return r; | |
84 | } else if (!s) | |
85 | return -EIO; | |
86 | ||
87 | r = dhcp_lease_load(s, &lease); | |
88 | if (r < 0) | |
89 | return r; | |
90 | ||
91 | *ret = lease; | |
92 | ||
93 | return 0; | |
94 | } | |
95 | ||
96 | _public_ int sd_network_get_ifindices(unsigned **indices) { | |
97 | _cleanup_closedir_ DIR *d; | |
98 | int r = 0; | |
99 | unsigned n = 0; | |
100 | _cleanup_free_ uid_t *l = NULL; | |
101 | ||
102 | d = opendir("/run/systemd/network/links/"); | |
103 | if (!d) | |
104 | return -errno; | |
105 | ||
106 | for (;;) { | |
107 | struct dirent *de; | |
108 | int k; | |
109 | unsigned index; | |
110 | ||
111 | errno = 0; | |
112 | de = readdir(d); | |
113 | if (!de && errno != 0) | |
114 | return -errno; | |
115 | ||
116 | if (!de) | |
117 | break; | |
118 | ||
119 | dirent_ensure_type(d, de); | |
120 | ||
121 | if (!dirent_is_file(de)) | |
122 | continue; | |
123 | ||
124 | k = safe_atou(de->d_name, &index); | |
125 | if (k < 0) | |
126 | continue; | |
127 | ||
128 | if (indices) { | |
129 | if ((unsigned) r >= n) { | |
130 | unsigned *t; | |
131 | ||
132 | n = MAX(16, 2*r); | |
133 | t = realloc(l, sizeof(unsigned) * n); | |
134 | if (!t) | |
135 | return -ENOMEM; | |
136 | ||
137 | l = t; | |
138 | } | |
139 | ||
140 | assert((unsigned) r < n); | |
141 | l[r++] = index; | |
142 | } else | |
143 | r++; | |
144 | } | |
145 | ||
146 | if (indices) { | |
147 | *indices = l; | |
148 | l = NULL; | |
149 | } | |
150 | ||
151 | return r; | |
152 | } | |
153 | ||
154 | static inline int MONITOR_TO_FD(sd_network_monitor *m) { | |
155 | return (int) (unsigned long) m - 1; | |
156 | } | |
157 | ||
158 | static inline sd_network_monitor* FD_TO_MONITOR(int fd) { | |
159 | return (sd_network_monitor*) (unsigned long) (fd + 1); | |
160 | } | |
161 | ||
162 | _public_ int sd_network_monitor_new(const char *category, sd_network_monitor **m) { | |
163 | int fd, k; | |
164 | bool good = false; | |
165 | ||
166 | assert_return(m, -EINVAL); | |
167 | ||
168 | fd = inotify_init1(IN_NONBLOCK|IN_CLOEXEC); | |
169 | if (fd < 0) | |
170 | return -errno; | |
171 | ||
172 | if (!category || streq(category, "netif")) { | |
173 | k = inotify_add_watch(fd, "/run/systemd/network/links/", IN_MOVED_TO|IN_DELETE); | |
174 | if (k < 0) { | |
175 | close_nointr_nofail(fd); | |
176 | return -errno; | |
177 | } | |
178 | ||
179 | good = true; | |
180 | } | |
181 | ||
182 | if (!good) { | |
183 | close_nointr(fd); | |
184 | return -EINVAL; | |
185 | } | |
186 | ||
187 | *m = FD_TO_MONITOR(fd); | |
188 | return 0; | |
189 | } | |
190 | ||
191 | _public_ sd_network_monitor* sd_network_monitor_unref(sd_network_monitor *m) { | |
192 | int fd; | |
193 | ||
194 | assert_return(m, NULL); | |
195 | ||
196 | fd = MONITOR_TO_FD(m); | |
197 | close_nointr(fd); | |
198 | ||
199 | return NULL; | |
200 | } | |
201 | ||
202 | _public_ int sd_network_monitor_flush(sd_network_monitor *m) { | |
203 | ||
204 | assert_return(m, -EINVAL); | |
205 | ||
206 | return flush_fd(MONITOR_TO_FD(m)); | |
207 | } | |
208 | ||
209 | _public_ int sd_network_monitor_get_fd(sd_network_monitor *m) { | |
210 | ||
211 | assert_return(m, -EINVAL); | |
212 | ||
213 | return MONITOR_TO_FD(m); | |
214 | } | |
215 | ||
216 | _public_ int sd_network_monitor_get_events(sd_network_monitor *m) { | |
217 | ||
218 | assert_return(m, -EINVAL); | |
219 | ||
220 | /* For now we will only return POLLIN here, since we don't | |
221 | * need anything else ever for inotify. However, let's have | |
222 | * this API to keep our options open should we later on need | |
223 | * it. */ | |
224 | return POLLIN; | |
225 | } | |
226 | ||
227 | _public_ int sd_network_monitor_get_timeout(sd_network_monitor *m, uint64_t *timeout_usec) { | |
228 | ||
229 | assert_return(m, -EINVAL); | |
230 | assert_return(timeout_usec, -EINVAL); | |
231 | ||
232 | /* For now we will only return (uint64_t) -1, since we don't | |
233 | * need any timeout. However, let's have this API to keep our | |
234 | * options open should we later on need it. */ | |
235 | *timeout_usec = (uint64_t) -1; | |
236 | return 0; | |
237 | } |