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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 | ||
3ffd4af2 LP |
22 | #include "bus-internal.h" |
23 | #include "bus-util.h" | |
24 | #include "cgroup-util.h" | |
674eb685 | 25 | #include "conf-parser.h" |
a0956174 | 26 | #include "dirent-util.h" |
3ffd4af2 | 27 | #include "fd-util.h" |
0d39fa9c | 28 | #include "fileio.h" |
674eb685 | 29 | #include "mkdir.h" |
3ffd4af2 | 30 | #include "special.h" |
674eb685 | 31 | #include "unit-name.h" |
3ffd4af2 | 32 | #include "util.h" |
674eb685 | 33 | |
7c9a6f90 | 34 | static const char *arg_dest_late = "/tmp", *arg_dest = "/tmp"; |
674eb685 LP |
35 | |
36 | static int create_dbus_files( | |
37 | const char *path, | |
38 | const char *name, | |
39 | const char *service, | |
40 | const char *exec, | |
41 | const char *user, | |
42 | const char *type) { | |
43 | ||
44 | _cleanup_free_ char *b = NULL, *s = NULL, *lnk = NULL; | |
45 | _cleanup_fclose_ FILE *f = NULL; | |
0975b63f | 46 | int r; |
674eb685 LP |
47 | |
48 | assert(path); | |
49 | assert(name); | |
5c817d31 | 50 | assert(service || exec); |
674eb685 LP |
51 | |
52 | if (!service) { | |
53 | _cleanup_free_ char *a = NULL; | |
54 | ||
55 | s = strjoin("dbus-", name, ".service", NULL); | |
56 | if (!s) | |
57 | return log_oom(); | |
58 | ||
7c9a6f90 | 59 | a = strjoin(arg_dest_late, "/", s, NULL); |
674eb685 LP |
60 | if (!a) |
61 | return log_oom(); | |
62 | ||
63 | f = fopen(a, "wxe"); | |
4a62c710 MS |
64 | if (!f) |
65 | return log_error_errno(errno, "Failed to create %s: %m", a); | |
674eb685 LP |
66 | |
67 | fprintf(f, | |
68 | "# Automatically generated by systemd-dbus1-generator\n\n" | |
69 | "[Unit]\n" | |
5c817d31 | 70 | "SourcePath=%s\n" |
c3834f9b LP |
71 | "Description=DBUS1: %s\n" |
72 | "Documentation=man:systemd-dbus1-generator(8)\n\n" | |
674eb685 LP |
73 | "[Service]\n" |
74 | "ExecStart=%s\n" | |
75 | "Type=dbus\n" | |
76 | "BusName=%s\n", | |
77 | path, | |
78 | name, | |
79 | exec, | |
80 | name); | |
81 | ||
82 | if (user) | |
83 | fprintf(f, "User=%s\n", user); | |
84 | ||
85 | ||
86 | if (type) { | |
87 | fprintf(f, "Environment=DBUS_STARTER_BUS_TYPE=%s\n", type); | |
88 | ||
89 | if (streq(type, "system")) | |
057171ef | 90 | fprintf(f, "Environment=DBUS_STARTER_ADDRESS=" DEFAULT_SYSTEM_BUS_ADDRESS "\n"); |
62cfb98a KS |
91 | else if (streq(type, "session")) { |
92 | char *run; | |
93 | ||
94 | run = getenv("XDG_RUNTIME_DIR"); | |
95 | if (!run) { | |
96 | log_error("XDG_RUNTIME_DIR not set."); | |
97 | return -EINVAL; | |
98 | } | |
99 | ||
057171ef DH |
100 | fprintf(f, "Environment=DBUS_STARTER_ADDRESS="KERNEL_USER_BUS_ADDRESS_FMT ";" UNIX_USER_BUS_ADDRESS_FMT "\n", |
101 | getuid(), run); | |
62cfb98a | 102 | } |
674eb685 LP |
103 | } |
104 | ||
0975b63f | 105 | r = fflush_and_check(f); |
23bbb0de MS |
106 | if (r < 0) |
107 | return log_error_errno(r, "Failed to write %s: %m", a); | |
674eb685 | 108 | |
74ca738f | 109 | f = safe_fclose(f); |
0975b63f | 110 | |
674eb685 LP |
111 | service = s; |
112 | } | |
113 | ||
7c9a6f90 | 114 | b = strjoin(arg_dest_late, "/", name, ".busname", NULL); |
674eb685 LP |
115 | if (!b) |
116 | return log_oom(); | |
117 | ||
118 | f = fopen(b, "wxe"); | |
4a62c710 MS |
119 | if (!f) |
120 | return log_error_errno(errno, "Failed to create %s: %m", b); | |
674eb685 LP |
121 | |
122 | fprintf(f, | |
123 | "# Automatically generated by systemd-dbus1-generator\n\n" | |
124 | "[Unit]\n" | |
5c817d31 | 125 | "SourcePath=%s\n" |
c3834f9b LP |
126 | "Description=DBUS1: %s\n" |
127 | "Documentation=man:systemd-dbus1-generator(8)\n\n" | |
674eb685 LP |
128 | "[BusName]\n" |
129 | "Name=%s\n" | |
a9beb58d | 130 | "Service=%s\n" |
a9beb58d | 131 | "AllowWorld=talk\n", |
674eb685 LP |
132 | path, |
133 | name, | |
134 | name, | |
135 | service); | |
136 | ||
0975b63f | 137 | r = fflush_and_check(f); |
23bbb0de MS |
138 | if (r < 0) |
139 | return log_error_errno(r, "Failed to write %s: %m", b); | |
674eb685 | 140 | |
7c9a6f90 | 141 | lnk = strjoin(arg_dest_late, "/" SPECIAL_BUSNAMES_TARGET ".wants/", name, ".busname", NULL); |
674eb685 LP |
142 | if (!lnk) |
143 | return log_oom(); | |
144 | ||
145 | mkdir_parents_label(lnk, 0755); | |
4a62c710 MS |
146 | if (symlink(b, lnk)) |
147 | return log_error_errno(errno, "Failed to create symlink %s: %m", lnk); | |
674eb685 LP |
148 | |
149 | return 0; | |
150 | } | |
151 | ||
152 | static int add_dbus(const char *path, const char *fname, const char *type) { | |
153 | _cleanup_free_ char *name = NULL, *exec = NULL, *user = NULL, *service = NULL; | |
154 | ||
e9f3d2d5 | 155 | const ConfigTableItem table[] = { |
674eb685 LP |
156 | { "D-BUS Service", "Name", config_parse_string, 0, &name }, |
157 | { "D-BUS Service", "Exec", config_parse_string, 0, &exec }, | |
158 | { "D-BUS Service", "User", config_parse_string, 0, &user }, | |
159 | { "D-BUS Service", "SystemdService", config_parse_string, 0, &service }, | |
34a317e1 | 160 | { }, |
674eb685 LP |
161 | }; |
162 | ||
36f822c4 | 163 | char *p; |
674eb685 LP |
164 | int r; |
165 | ||
166 | assert(path); | |
167 | assert(fname); | |
168 | ||
63c372cb | 169 | p = strjoina(path, "/", fname); |
36f822c4 ZJS |
170 | r = config_parse(NULL, p, NULL, |
171 | "D-BUS Service\0", | |
172 | config_item_table_lookup, table, | |
173 | true, false, true, NULL); | |
674eb685 LP |
174 | if (r < 0) |
175 | return r; | |
176 | ||
177 | if (!name) { | |
178 | log_warning("Activation file %s lacks name setting, ignoring.", p); | |
179 | return 0; | |
180 | } | |
181 | ||
182 | if (!service_name_is_valid(name)) { | |
183 | log_warning("Bus service name %s is not valid, ignoring.", name); | |
184 | return 0; | |
185 | } | |
186 | ||
4c3a127c LP |
187 | if (streq(name, "org.freedesktop.systemd1")) { |
188 | log_debug("Skipping %s, identified as systemd.", p); | |
189 | return 0; | |
190 | } | |
191 | ||
674eb685 | 192 | if (service) { |
7410616c | 193 | if (!unit_name_is_valid(service, UNIT_NAME_PLAIN|UNIT_NAME_INSTANCE)) { |
674eb685 LP |
194 | log_warning("Unit name %s is not valid, ignoring.", service); |
195 | return 0; | |
196 | } | |
197 | if (!endswith(service, ".service")) { | |
198 | log_warning("Bus names can only activate services, ignoring %s.", p); | |
199 | return 0; | |
200 | } | |
201 | } else { | |
4c3a127c | 202 | if (streq(exec, "/bin/false") || !exec) { |
674eb685 LP |
203 | log_warning("Neither service name nor binary path specified, ignoring %s.", p); |
204 | return 0; | |
205 | } | |
206 | ||
207 | if (exec[0] != '/') { | |
208 | log_warning("Exec= in %s does not start with an absolute path, ignoring.", p); | |
209 | return 0; | |
210 | } | |
211 | } | |
212 | ||
213 | return create_dbus_files(p, name, service, exec, user, type); | |
214 | } | |
215 | ||
5c817d31 | 216 | static int parse_dbus_fragments(const char *path, const char *type) { |
674eb685 LP |
217 | _cleanup_closedir_ DIR *d = NULL; |
218 | struct dirent *de; | |
674eb685 LP |
219 | int r; |
220 | ||
5c817d31 LP |
221 | assert(path); |
222 | assert(type); | |
674eb685 | 223 | |
5c817d31 | 224 | d = opendir(path); |
674eb685 LP |
225 | if (!d) { |
226 | if (errno == -ENOENT) | |
227 | return 0; | |
228 | ||
56f64d95 | 229 | log_error_errno(errno, "Failed to enumerate D-Bus activated services: %m"); |
674eb685 LP |
230 | return -errno; |
231 | } | |
232 | ||
233 | r = 0; | |
234 | FOREACH_DIRENT(de, d, goto fail) { | |
235 | int q; | |
236 | ||
237 | if (!endswith(de->d_name, ".service")) | |
238 | continue; | |
239 | ||
5c817d31 | 240 | q = add_dbus(path, de->d_name, type); |
674eb685 LP |
241 | if (q < 0) |
242 | r = q; | |
243 | } | |
244 | ||
245 | return r; | |
246 | ||
247 | fail: | |
56f64d95 | 248 | log_error_errno(errno, "Failed to read D-Bus services directory: %m"); |
674eb685 LP |
249 | return -errno; |
250 | } | |
251 | ||
5c817d31 LP |
252 | static int link_busnames_target(const char *units) { |
253 | const char *f, *t; | |
254 | ||
63c372cb LP |
255 | f = strjoina(units, "/" SPECIAL_BUSNAMES_TARGET); |
256 | t = strjoina(arg_dest, "/" SPECIAL_BASIC_TARGET ".wants/" SPECIAL_BUSNAMES_TARGET); | |
5c817d31 LP |
257 | |
258 | mkdir_parents_label(t, 0755); | |
4a62c710 MS |
259 | if (symlink(f, t) < 0) |
260 | return log_error_errno(errno, "Failed to create symlink %s: %m", t); | |
5c817d31 LP |
261 | |
262 | return 0; | |
263 | } | |
264 | ||
7c9a6f90 LP |
265 | static int link_compatibility(const char *units) { |
266 | const char *f, *t; | |
267 | ||
63c372cb LP |
268 | f = strjoina(units, "/systemd-bus-proxyd.socket"); |
269 | t = strjoina(arg_dest, "/" SPECIAL_DBUS_SOCKET); | |
7c9a6f90 | 270 | mkdir_parents_label(t, 0755); |
4a62c710 MS |
271 | if (symlink(f, t) < 0) |
272 | return log_error_errno(errno, "Failed to create symlink %s: %m", t); | |
7c9a6f90 | 273 | |
63c372cb LP |
274 | f = strjoina(units, "/systemd-bus-proxyd.socket"); |
275 | t = strjoina(arg_dest, "/" SPECIAL_SOCKETS_TARGET ".wants/systemd-bus-proxyd.socket"); | |
ac12cf5b | 276 | mkdir_parents_label(t, 0755); |
4a62c710 MS |
277 | if (symlink(f, t) < 0) |
278 | return log_error_errno(errno, "Failed to create symlink %s: %m", t); | |
ac12cf5b | 279 | |
63c372cb | 280 | t = strjoina(arg_dest, "/" SPECIAL_DBUS_SERVICE); |
4a62c710 MS |
281 | if (symlink("/dev/null", t) < 0) |
282 | return log_error_errno(errno, "Failed to mask %s: %m", t); | |
010b2b8d | 283 | |
7c9a6f90 LP |
284 | return 0; |
285 | } | |
286 | ||
674eb685 | 287 | int main(int argc, char *argv[]) { |
5c817d31 LP |
288 | const char *path, *type, *units; |
289 | int r, q; | |
674eb685 LP |
290 | |
291 | if (argc > 1 && argc != 4) { | |
292 | log_error("This program takes three or no arguments."); | |
293 | return EXIT_FAILURE; | |
294 | } | |
295 | ||
7c9a6f90 LP |
296 | if (argc > 1) { |
297 | arg_dest = argv[1]; | |
298 | arg_dest_late = argv[3]; | |
299 | } | |
674eb685 LP |
300 | |
301 | log_set_target(LOG_TARGET_SAFE); | |
302 | log_parse_environment(); | |
303 | log_open(); | |
304 | ||
305 | umask(0022); | |
306 | ||
d79acc30 | 307 | if (!is_kdbus_available()) |
674eb685 LP |
308 | return 0; |
309 | ||
5c817d31 LP |
310 | r = cg_pid_get_owner_uid(0, NULL); |
311 | if (r >= 0) { | |
312 | path = "/usr/share/dbus-1/services"; | |
313 | type = "session"; | |
314 | units = USER_DATA_UNIT_PATH; | |
d79acc30 | 315 | } else if (r == -ENXIO) { |
5c817d31 LP |
316 | path = "/usr/share/dbus-1/system-services"; |
317 | type = "system"; | |
318 | units = SYSTEM_DATA_UNIT_PATH; | |
23bbb0de MS |
319 | } else |
320 | return log_error_errno(r, "Failed to determine whether we are running as user or system instance: %m"); | |
5c817d31 LP |
321 | |
322 | r = parse_dbus_fragments(path, type); | |
323 | ||
324 | /* FIXME: One day this should just be pulled in statically from basic.target */ | |
325 | q = link_busnames_target(units); | |
326 | if (q < 0) | |
327 | r = q; | |
674eb685 | 328 | |
7c9a6f90 LP |
329 | q = link_compatibility(units); |
330 | if (q < 0) | |
331 | r = q; | |
332 | ||
674eb685 LP |
333 | return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS; |
334 | } |