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60f067b4 JS |
1 | /*** |
2 | This file is part of systemd. | |
3 | ||
4 | Copyright 2013 Lennart Poettering | |
5 | ||
6 | systemd is free software; you can redistribute it and/or modify it | |
7 | under the terms of the GNU Lesser General Public License as published by | |
8 | the Free Software Foundation; either version 2.1 of the License, or | |
9 | (at your option) any later version. | |
10 | ||
11 | systemd is distributed in the hope that it will be useful, but | |
12 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
14 | Lesser General Public License for more details. | |
15 | ||
16 | You should have received a copy of the GNU Lesser General Public License | |
17 | along with systemd; If not, see <http://www.gnu.org/licenses/>. | |
18 | ***/ | |
19 | ||
db2df898 MP |
20 | #include "alloc-util.h" |
21 | #include "bus-internal.h" | |
22 | #include "bus-util.h" | |
23 | #include "cgroup-util.h" | |
60f067b4 | 24 | #include "conf-parser.h" |
db2df898 MP |
25 | #include "dirent-util.h" |
26 | #include "fd-util.h" | |
27 | #include "fileio.h" | |
60f067b4 | 28 | #include "mkdir.h" |
db2df898 | 29 | #include "special.h" |
60f067b4 | 30 | #include "unit-name.h" |
db2df898 | 31 | #include "util.h" |
60f067b4 JS |
32 | |
33 | static const char *arg_dest_late = "/tmp", *arg_dest = "/tmp"; | |
34 | ||
35 | static int create_dbus_files( | |
36 | const char *path, | |
37 | const char *name, | |
38 | const char *service, | |
39 | const char *exec, | |
40 | const char *user, | |
41 | const char *type) { | |
42 | ||
43 | _cleanup_free_ char *b = NULL, *s = NULL, *lnk = NULL; | |
44 | _cleanup_fclose_ FILE *f = NULL; | |
5eef597e | 45 | int r; |
60f067b4 JS |
46 | |
47 | assert(path); | |
48 | assert(name); | |
49 | assert(service || exec); | |
50 | ||
51 | if (!service) { | |
52 | _cleanup_free_ char *a = NULL; | |
53 | ||
54 | s = strjoin("dbus-", name, ".service", NULL); | |
55 | if (!s) | |
56 | return log_oom(); | |
57 | ||
58 | a = strjoin(arg_dest_late, "/", s, NULL); | |
59 | if (!a) | |
60 | return log_oom(); | |
61 | ||
62 | f = fopen(a, "wxe"); | |
f47781d8 MP |
63 | if (!f) |
64 | return log_error_errno(errno, "Failed to create %s: %m", a); | |
60f067b4 JS |
65 | |
66 | fprintf(f, | |
67 | "# Automatically generated by systemd-dbus1-generator\n\n" | |
68 | "[Unit]\n" | |
69 | "SourcePath=%s\n" | |
70 | "Description=DBUS1: %s\n" | |
71 | "Documentation=man:systemd-dbus1-generator(8)\n\n" | |
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")) | |
f47781d8 | 89 | fprintf(f, "Environment=DBUS_STARTER_ADDRESS=" DEFAULT_SYSTEM_BUS_ADDRESS "\n"); |
60f067b4 JS |
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 | ||
f47781d8 | 99 | fprintf(f, "Environment=DBUS_STARTER_ADDRESS="KERNEL_USER_BUS_ADDRESS_FMT ";" UNIX_USER_BUS_ADDRESS_FMT "\n", |
60f067b4 JS |
100 | getuid(), run); |
101 | } | |
102 | } | |
103 | ||
5eef597e | 104 | r = fflush_and_check(f); |
f47781d8 MP |
105 | if (r < 0) |
106 | return log_error_errno(r, "Failed to write %s: %m", a); | |
60f067b4 | 107 | |
6300502b | 108 | f = safe_fclose(f); |
5eef597e | 109 | |
60f067b4 JS |
110 | service = s; |
111 | } | |
112 | ||
113 | b = strjoin(arg_dest_late, "/", name, ".busname", NULL); | |
114 | if (!b) | |
115 | return log_oom(); | |
116 | ||
117 | f = fopen(b, "wxe"); | |
f47781d8 MP |
118 | if (!f) |
119 | return log_error_errno(errno, "Failed to create %s: %m", b); | |
60f067b4 JS |
120 | |
121 | fprintf(f, | |
122 | "# Automatically generated by systemd-dbus1-generator\n\n" | |
123 | "[Unit]\n" | |
124 | "SourcePath=%s\n" | |
125 | "Description=DBUS1: %s\n" | |
126 | "Documentation=man:systemd-dbus1-generator(8)\n\n" | |
127 | "[BusName]\n" | |
128 | "Name=%s\n" | |
129 | "Service=%s\n" | |
130 | "AllowWorld=talk\n", | |
131 | path, | |
132 | name, | |
133 | name, | |
134 | service); | |
135 | ||
5eef597e | 136 | r = fflush_and_check(f); |
f47781d8 MP |
137 | if (r < 0) |
138 | return log_error_errno(r, "Failed to write %s: %m", b); | |
60f067b4 JS |
139 | |
140 | lnk = strjoin(arg_dest_late, "/" SPECIAL_BUSNAMES_TARGET ".wants/", name, ".busname", NULL); | |
141 | if (!lnk) | |
142 | return log_oom(); | |
143 | ||
144 | mkdir_parents_label(lnk, 0755); | |
f47781d8 MP |
145 | if (symlink(b, lnk)) |
146 | return log_error_errno(errno, "Failed to create symlink %s: %m", lnk); | |
60f067b4 JS |
147 | |
148 | return 0; | |
149 | } | |
150 | ||
151 | static int add_dbus(const char *path, const char *fname, const char *type) { | |
152 | _cleanup_free_ char *name = NULL, *exec = NULL, *user = NULL, *service = NULL; | |
153 | ||
5eef597e | 154 | const ConfigTableItem table[] = { |
60f067b4 JS |
155 | { "D-BUS Service", "Name", config_parse_string, 0, &name }, |
156 | { "D-BUS Service", "Exec", config_parse_string, 0, &exec }, | |
157 | { "D-BUS Service", "User", config_parse_string, 0, &user }, | |
158 | { "D-BUS Service", "SystemdService", config_parse_string, 0, &service }, | |
e735f4d4 | 159 | { }, |
60f067b4 JS |
160 | }; |
161 | ||
5eef597e | 162 | char *p; |
60f067b4 JS |
163 | int r; |
164 | ||
165 | assert(path); | |
166 | assert(fname); | |
167 | ||
e735f4d4 | 168 | p = strjoina(path, "/", fname); |
5eef597e MP |
169 | r = config_parse(NULL, p, NULL, |
170 | "D-BUS Service\0", | |
171 | config_item_table_lookup, table, | |
172 | true, false, true, NULL); | |
60f067b4 JS |
173 | if (r < 0) |
174 | return r; | |
175 | ||
176 | if (!name) { | |
177 | log_warning("Activation file %s lacks name setting, ignoring.", p); | |
178 | return 0; | |
179 | } | |
180 | ||
181 | if (!service_name_is_valid(name)) { | |
182 | log_warning("Bus service name %s is not valid, ignoring.", name); | |
183 | return 0; | |
184 | } | |
185 | ||
186 | if (streq(name, "org.freedesktop.systemd1")) { | |
187 | log_debug("Skipping %s, identified as systemd.", p); | |
188 | return 0; | |
189 | } | |
190 | ||
191 | if (service) { | |
e3bff60a | 192 | if (!unit_name_is_valid(service, UNIT_NAME_PLAIN|UNIT_NAME_INSTANCE)) { |
60f067b4 JS |
193 | log_warning("Unit name %s is not valid, ignoring.", service); |
194 | return 0; | |
195 | } | |
196 | if (!endswith(service, ".service")) { | |
197 | log_warning("Bus names can only activate services, ignoring %s.", p); | |
198 | return 0; | |
199 | } | |
200 | } else { | |
201 | if (streq(exec, "/bin/false") || !exec) { | |
202 | log_warning("Neither service name nor binary path specified, ignoring %s.", p); | |
203 | return 0; | |
204 | } | |
205 | ||
206 | if (exec[0] != '/') { | |
207 | log_warning("Exec= in %s does not start with an absolute path, ignoring.", p); | |
208 | return 0; | |
209 | } | |
210 | } | |
211 | ||
212 | return create_dbus_files(p, name, service, exec, user, type); | |
213 | } | |
214 | ||
215 | static int parse_dbus_fragments(const char *path, const char *type) { | |
216 | _cleanup_closedir_ DIR *d = NULL; | |
217 | struct dirent *de; | |
218 | int r; | |
219 | ||
220 | assert(path); | |
221 | assert(type); | |
222 | ||
223 | d = opendir(path); | |
224 | if (!d) { | |
225 | if (errno == -ENOENT) | |
226 | return 0; | |
227 | ||
db2df898 | 228 | return log_error_errno(errno, "Failed to enumerate D-Bus activated services: %m"); |
60f067b4 JS |
229 | } |
230 | ||
231 | r = 0; | |
232 | FOREACH_DIRENT(de, d, goto fail) { | |
233 | int q; | |
234 | ||
235 | if (!endswith(de->d_name, ".service")) | |
236 | continue; | |
237 | ||
238 | q = add_dbus(path, de->d_name, type); | |
239 | if (q < 0) | |
240 | r = q; | |
241 | } | |
242 | ||
243 | return r; | |
244 | ||
245 | fail: | |
db2df898 | 246 | return log_error_errno(errno, "Failed to read D-Bus services directory: %m"); |
60f067b4 JS |
247 | } |
248 | ||
249 | static int link_busnames_target(const char *units) { | |
250 | const char *f, *t; | |
251 | ||
e735f4d4 MP |
252 | f = strjoina(units, "/" SPECIAL_BUSNAMES_TARGET); |
253 | t = strjoina(arg_dest, "/" SPECIAL_BASIC_TARGET ".wants/" SPECIAL_BUSNAMES_TARGET); | |
60f067b4 JS |
254 | |
255 | mkdir_parents_label(t, 0755); | |
f47781d8 MP |
256 | if (symlink(f, t) < 0) |
257 | return log_error_errno(errno, "Failed to create symlink %s: %m", t); | |
60f067b4 JS |
258 | |
259 | return 0; | |
260 | } | |
261 | ||
262 | static int link_compatibility(const char *units) { | |
263 | const char *f, *t; | |
264 | ||
e735f4d4 MP |
265 | f = strjoina(units, "/systemd-bus-proxyd.socket"); |
266 | t = strjoina(arg_dest, "/" SPECIAL_DBUS_SOCKET); | |
60f067b4 | 267 | mkdir_parents_label(t, 0755); |
f47781d8 MP |
268 | if (symlink(f, t) < 0) |
269 | return log_error_errno(errno, "Failed to create symlink %s: %m", t); | |
60f067b4 | 270 | |
e735f4d4 MP |
271 | f = strjoina(units, "/systemd-bus-proxyd.socket"); |
272 | t = strjoina(arg_dest, "/" SPECIAL_SOCKETS_TARGET ".wants/systemd-bus-proxyd.socket"); | |
60f067b4 | 273 | mkdir_parents_label(t, 0755); |
f47781d8 MP |
274 | if (symlink(f, t) < 0) |
275 | return log_error_errno(errno, "Failed to create symlink %s: %m", t); | |
60f067b4 | 276 | |
e735f4d4 | 277 | t = strjoina(arg_dest, "/" SPECIAL_DBUS_SERVICE); |
f47781d8 MP |
278 | if (symlink("/dev/null", t) < 0) |
279 | return log_error_errno(errno, "Failed to mask %s: %m", t); | |
60f067b4 JS |
280 | |
281 | return 0; | |
282 | } | |
283 | ||
284 | int main(int argc, char *argv[]) { | |
285 | const char *path, *type, *units; | |
286 | int r, q; | |
287 | ||
288 | if (argc > 1 && argc != 4) { | |
289 | log_error("This program takes three or no arguments."); | |
290 | return EXIT_FAILURE; | |
291 | } | |
292 | ||
293 | if (argc > 1) { | |
294 | arg_dest = argv[1]; | |
295 | arg_dest_late = argv[3]; | |
296 | } | |
297 | ||
298 | log_set_target(LOG_TARGET_SAFE); | |
299 | log_parse_environment(); | |
300 | log_open(); | |
301 | ||
302 | umask(0022); | |
303 | ||
e3bff60a | 304 | if (!is_kdbus_available()) |
60f067b4 JS |
305 | return 0; |
306 | ||
307 | r = cg_pid_get_owner_uid(0, NULL); | |
308 | if (r >= 0) { | |
309 | path = "/usr/share/dbus-1/services"; | |
310 | type = "session"; | |
311 | units = USER_DATA_UNIT_PATH; | |
e3bff60a | 312 | } else if (r == -ENXIO) { |
60f067b4 JS |
313 | path = "/usr/share/dbus-1/system-services"; |
314 | type = "system"; | |
315 | units = SYSTEM_DATA_UNIT_PATH; | |
f47781d8 MP |
316 | } else |
317 | return log_error_errno(r, "Failed to determine whether we are running as user or system instance: %m"); | |
60f067b4 JS |
318 | |
319 | r = parse_dbus_fragments(path, type); | |
320 | ||
321 | /* FIXME: One day this should just be pulled in statically from basic.target */ | |
322 | q = link_busnames_target(units); | |
323 | if (q < 0) | |
324 | r = q; | |
325 | ||
326 | q = link_compatibility(units); | |
327 | if (q < 0) | |
328 | r = q; | |
329 | ||
330 | return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS; | |
331 | } |