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674eb685 LP |
1 | /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ |
2 | ||
3 | /*** | |
4 | This file is part of systemd. | |
5 | ||
6 | Copyright 2013 Lennart Poettering | |
7 | ||
8 | systemd is free software; you can redistribute it and/or modify it | |
9 | under the terms of the GNU Lesser General Public License as published by | |
10 | the Free Software Foundation; either version 2.1 of the License, or | |
11 | (at your option) any later version. | |
12 | ||
13 | systemd is distributed in the hope that it will be useful, but | |
14 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
16 | Lesser General Public License for more details. | |
17 | ||
18 | You should have received a copy of the GNU Lesser General Public License | |
19 | along with systemd; If not, see <http://www.gnu.org/licenses/>. | |
20 | ***/ | |
21 | ||
22 | #include "util.h" | |
23 | #include "conf-parser.h" | |
24 | #include "special.h" | |
25 | #include "mkdir.h" | |
26 | #include "bus-util.h" | |
27 | #include "bus-internal.h" | |
28 | #include "unit-name.h" | |
29 | #include "cgroup-util.h" | |
30 | ||
7c9a6f90 | 31 | static const char *arg_dest_late = "/tmp", *arg_dest = "/tmp"; |
674eb685 LP |
32 | |
33 | static int create_dbus_files( | |
34 | const char *path, | |
35 | const char *name, | |
36 | const char *service, | |
37 | const char *exec, | |
38 | const char *user, | |
39 | const char *type) { | |
40 | ||
41 | _cleanup_free_ char *b = NULL, *s = NULL, *lnk = NULL; | |
42 | _cleanup_fclose_ FILE *f = NULL; | |
0975b63f | 43 | int r; |
674eb685 LP |
44 | |
45 | assert(path); | |
46 | assert(name); | |
5c817d31 | 47 | assert(service || exec); |
674eb685 LP |
48 | |
49 | if (!service) { | |
50 | _cleanup_free_ char *a = NULL; | |
51 | ||
52 | s = strjoin("dbus-", name, ".service", NULL); | |
53 | if (!s) | |
54 | return log_oom(); | |
55 | ||
7c9a6f90 | 56 | a = strjoin(arg_dest_late, "/", s, NULL); |
674eb685 LP |
57 | if (!a) |
58 | return log_oom(); | |
59 | ||
60 | f = fopen(a, "wxe"); | |
61 | if (!f) { | |
62 | log_error("Failed to create %s: %m", a); | |
63 | return -errno; | |
64 | } | |
65 | ||
66 | fprintf(f, | |
67 | "# Automatically generated by systemd-dbus1-generator\n\n" | |
68 | "[Unit]\n" | |
5c817d31 | 69 | "SourcePath=%s\n" |
c3834f9b LP |
70 | "Description=DBUS1: %s\n" |
71 | "Documentation=man:systemd-dbus1-generator(8)\n\n" | |
674eb685 LP |
72 | "[Service]\n" |
73 | "ExecStart=%s\n" | |
74 | "Type=dbus\n" | |
75 | "BusName=%s\n", | |
76 | path, | |
77 | name, | |
78 | exec, | |
79 | name); | |
80 | ||
81 | if (user) | |
82 | fprintf(f, "User=%s\n", user); | |
83 | ||
84 | ||
85 | if (type) { | |
86 | fprintf(f, "Environment=DBUS_STARTER_BUS_TYPE=%s\n", type); | |
87 | ||
88 | if (streq(type, "system")) | |
62cfb98a KS |
89 | fprintf(f, "Environment=DBUS_STARTER_ADDRESS=" DEFAULT_SYSTEM_BUS_PATH "\n"); |
90 | else if (streq(type, "session")) { | |
91 | char *run; | |
92 | ||
93 | run = getenv("XDG_RUNTIME_DIR"); | |
94 | if (!run) { | |
95 | log_error("XDG_RUNTIME_DIR not set."); | |
96 | return -EINVAL; | |
97 | } | |
98 | ||
99 | fprintf(f, "Environment=DBUS_STARTER_ADDRESS="KERNEL_USER_BUS_FMT ";" UNIX_USER_BUS_FMT "\n", | |
de0671ee | 100 | getuid(), run); |
62cfb98a | 101 | } |
674eb685 LP |
102 | } |
103 | ||
0975b63f LP |
104 | r = fflush_and_check(f); |
105 | if (r < 0) { | |
0a1beeb6 | 106 | log_error_errno(-r, "Failed to write %s: %m", a); |
0975b63f | 107 | return r; |
674eb685 LP |
108 | } |
109 | ||
0975b63f LP |
110 | fclose(f); |
111 | f = NULL; | |
112 | ||
674eb685 LP |
113 | service = s; |
114 | } | |
115 | ||
7c9a6f90 | 116 | b = strjoin(arg_dest_late, "/", name, ".busname", NULL); |
674eb685 LP |
117 | if (!b) |
118 | return log_oom(); | |
119 | ||
120 | f = fopen(b, "wxe"); | |
121 | if (!f) { | |
122 | log_error("Failed to create %s: %m", b); | |
123 | return -errno; | |
124 | } | |
125 | ||
126 | fprintf(f, | |
127 | "# Automatically generated by systemd-dbus1-generator\n\n" | |
128 | "[Unit]\n" | |
5c817d31 | 129 | "SourcePath=%s\n" |
c3834f9b LP |
130 | "Description=DBUS1: %s\n" |
131 | "Documentation=man:systemd-dbus1-generator(8)\n\n" | |
674eb685 LP |
132 | "[BusName]\n" |
133 | "Name=%s\n" | |
a9beb58d | 134 | "Service=%s\n" |
a9beb58d | 135 | "AllowWorld=talk\n", |
674eb685 LP |
136 | path, |
137 | name, | |
138 | name, | |
139 | service); | |
140 | ||
0975b63f LP |
141 | r = fflush_and_check(f); |
142 | if (r < 0) { | |
0a1beeb6 | 143 | log_error_errno(-r, "Failed to write %s: %m", b); |
0975b63f | 144 | return r; |
674eb685 LP |
145 | } |
146 | ||
7c9a6f90 | 147 | lnk = strjoin(arg_dest_late, "/" SPECIAL_BUSNAMES_TARGET ".wants/", name, ".busname", NULL); |
674eb685 LP |
148 | if (!lnk) |
149 | return log_oom(); | |
150 | ||
151 | mkdir_parents_label(lnk, 0755); | |
152 | if (symlink(b, lnk)) { | |
5c817d31 | 153 | log_error("Failed to create symlink %s: %m", lnk); |
674eb685 LP |
154 | return -errno; |
155 | } | |
156 | ||
157 | return 0; | |
158 | } | |
159 | ||
160 | static int add_dbus(const char *path, const char *fname, const char *type) { | |
161 | _cleanup_free_ char *name = NULL, *exec = NULL, *user = NULL, *service = NULL; | |
162 | ||
e9f3d2d5 | 163 | const ConfigTableItem table[] = { |
674eb685 LP |
164 | { "D-BUS Service", "Name", config_parse_string, 0, &name }, |
165 | { "D-BUS Service", "Exec", config_parse_string, 0, &exec }, | |
166 | { "D-BUS Service", "User", config_parse_string, 0, &user }, | |
167 | { "D-BUS Service", "SystemdService", config_parse_string, 0, &service }, | |
168 | }; | |
169 | ||
36f822c4 | 170 | char *p; |
674eb685 LP |
171 | int r; |
172 | ||
173 | assert(path); | |
174 | assert(fname); | |
175 | ||
8085f163 | 176 | p = strappenda(path, "/", fname); |
36f822c4 ZJS |
177 | r = config_parse(NULL, p, NULL, |
178 | "D-BUS Service\0", | |
179 | config_item_table_lookup, table, | |
180 | true, false, true, NULL); | |
674eb685 LP |
181 | if (r < 0) |
182 | return r; | |
183 | ||
184 | if (!name) { | |
185 | log_warning("Activation file %s lacks name setting, ignoring.", p); | |
186 | return 0; | |
187 | } | |
188 | ||
189 | if (!service_name_is_valid(name)) { | |
190 | log_warning("Bus service name %s is not valid, ignoring.", name); | |
191 | return 0; | |
192 | } | |
193 | ||
4c3a127c LP |
194 | if (streq(name, "org.freedesktop.systemd1")) { |
195 | log_debug("Skipping %s, identified as systemd.", p); | |
196 | return 0; | |
197 | } | |
198 | ||
674eb685 | 199 | if (service) { |
f78e6385 | 200 | if (!unit_name_is_valid(service, TEMPLATE_INVALID)) { |
674eb685 LP |
201 | log_warning("Unit name %s is not valid, ignoring.", service); |
202 | return 0; | |
203 | } | |
204 | if (!endswith(service, ".service")) { | |
205 | log_warning("Bus names can only activate services, ignoring %s.", p); | |
206 | return 0; | |
207 | } | |
208 | } else { | |
4c3a127c | 209 | if (streq(exec, "/bin/false") || !exec) { |
674eb685 LP |
210 | log_warning("Neither service name nor binary path specified, ignoring %s.", p); |
211 | return 0; | |
212 | } | |
213 | ||
214 | if (exec[0] != '/') { | |
215 | log_warning("Exec= in %s does not start with an absolute path, ignoring.", p); | |
216 | return 0; | |
217 | } | |
218 | } | |
219 | ||
220 | return create_dbus_files(p, name, service, exec, user, type); | |
221 | } | |
222 | ||
5c817d31 | 223 | static int parse_dbus_fragments(const char *path, const char *type) { |
674eb685 LP |
224 | _cleanup_closedir_ DIR *d = NULL; |
225 | struct dirent *de; | |
674eb685 LP |
226 | int r; |
227 | ||
5c817d31 LP |
228 | assert(path); |
229 | assert(type); | |
674eb685 | 230 | |
5c817d31 | 231 | d = opendir(path); |
674eb685 LP |
232 | if (!d) { |
233 | if (errno == -ENOENT) | |
234 | return 0; | |
235 | ||
236 | log_error("Failed to enumerate D-Bus activated services: %m"); | |
237 | return -errno; | |
238 | } | |
239 | ||
240 | r = 0; | |
241 | FOREACH_DIRENT(de, d, goto fail) { | |
242 | int q; | |
243 | ||
244 | if (!endswith(de->d_name, ".service")) | |
245 | continue; | |
246 | ||
5c817d31 | 247 | q = add_dbus(path, de->d_name, type); |
674eb685 LP |
248 | if (q < 0) |
249 | r = q; | |
250 | } | |
251 | ||
252 | return r; | |
253 | ||
254 | fail: | |
255 | log_error("Failed to read D-Bus services directory: %m"); | |
256 | return -errno; | |
257 | } | |
258 | ||
5c817d31 LP |
259 | static int link_busnames_target(const char *units) { |
260 | const char *f, *t; | |
261 | ||
262 | f = strappenda(units, "/" SPECIAL_BUSNAMES_TARGET); | |
263 | t = strappenda(arg_dest, "/" SPECIAL_BASIC_TARGET ".wants/" SPECIAL_BUSNAMES_TARGET); | |
264 | ||
265 | mkdir_parents_label(t, 0755); | |
266 | if (symlink(f, t) < 0) { | |
267 | log_error("Failed to create symlink %s: %m", t); | |
268 | return -errno; | |
269 | } | |
270 | ||
271 | return 0; | |
272 | } | |
273 | ||
7c9a6f90 LP |
274 | static int link_compatibility(const char *units) { |
275 | const char *f, *t; | |
276 | ||
1c5f57c5 | 277 | f = strappenda(units, "/systemd-bus-proxyd.socket"); |
7c9a6f90 | 278 | t = strappenda(arg_dest, "/" SPECIAL_DBUS_SOCKET); |
7c9a6f90 LP |
279 | mkdir_parents_label(t, 0755); |
280 | if (symlink(f, t) < 0) { | |
281 | log_error("Failed to create symlink %s: %m", t); | |
282 | return -errno; | |
283 | } | |
284 | ||
ac12cf5b KS |
285 | f = strappenda(units, "/systemd-bus-proxyd.socket"); |
286 | t = strappenda(arg_dest, "/" SPECIAL_SOCKETS_TARGET ".wants/systemd-bus-proxyd.socket"); | |
287 | mkdir_parents_label(t, 0755); | |
288 | if (symlink(f, t) < 0) { | |
737dedeb | 289 | log_error("Failed to create symlink %s: %m", t); |
ac12cf5b KS |
290 | return -errno; |
291 | } | |
292 | ||
010b2b8d LP |
293 | t = strappenda(arg_dest, "/" SPECIAL_DBUS_SERVICE); |
294 | if (symlink("/dev/null", t) < 0) { | |
295 | log_error("Failed to mask %s: %m", t); | |
296 | return -errno; | |
297 | } | |
298 | ||
7c9a6f90 LP |
299 | return 0; |
300 | } | |
301 | ||
674eb685 | 302 | int main(int argc, char *argv[]) { |
5c817d31 LP |
303 | const char *path, *type, *units; |
304 | int r, q; | |
674eb685 LP |
305 | |
306 | if (argc > 1 && argc != 4) { | |
307 | log_error("This program takes three or no arguments."); | |
308 | return EXIT_FAILURE; | |
309 | } | |
310 | ||
7c9a6f90 LP |
311 | if (argc > 1) { |
312 | arg_dest = argv[1]; | |
313 | arg_dest_late = argv[3]; | |
314 | } | |
674eb685 LP |
315 | |
316 | log_set_target(LOG_TARGET_SAFE); | |
317 | log_parse_environment(); | |
318 | log_open(); | |
319 | ||
320 | umask(0022); | |
321 | ||
63cc4c31 | 322 | if (access("/sys/fs/kdbus/control", F_OK) < 0) |
674eb685 LP |
323 | return 0; |
324 | ||
5c817d31 LP |
325 | r = cg_pid_get_owner_uid(0, NULL); |
326 | if (r >= 0) { | |
327 | path = "/usr/share/dbus-1/services"; | |
328 | type = "session"; | |
329 | units = USER_DATA_UNIT_PATH; | |
330 | } else if (r == -ENOENT) { | |
331 | path = "/usr/share/dbus-1/system-services"; | |
332 | type = "system"; | |
333 | units = SYSTEM_DATA_UNIT_PATH; | |
c71ecee5 | 334 | } else { |
0a1beeb6 | 335 | log_error_errno(-r, "Failed to determine whether we are running as user or system instance: %m"); |
5c817d31 LP |
336 | return r; |
337 | } | |
338 | ||
339 | r = parse_dbus_fragments(path, type); | |
340 | ||
341 | /* FIXME: One day this should just be pulled in statically from basic.target */ | |
342 | q = link_busnames_target(units); | |
343 | if (q < 0) | |
344 | r = q; | |
674eb685 | 345 | |
7c9a6f90 LP |
346 | q = link_compatibility(units); |
347 | if (q < 0) | |
348 | r = q; | |
349 | ||
674eb685 LP |
350 | return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS; |
351 | } |