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60f067b4 JS |
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 | ||
31 | static const char *arg_dest_late = "/tmp", *arg_dest = "/tmp"; | |
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; | |
5eef597e | 43 | int r; |
60f067b4 JS |
44 | |
45 | assert(path); | |
46 | assert(name); | |
47 | assert(service || exec); | |
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 | ||
56 | a = strjoin(arg_dest_late, "/", s, NULL); | |
57 | if (!a) | |
58 | return log_oom(); | |
59 | ||
60 | f = fopen(a, "wxe"); | |
f47781d8 MP |
61 | if (!f) |
62 | return log_error_errno(errno, "Failed to create %s: %m", a); | |
60f067b4 JS |
63 | |
64 | fprintf(f, | |
65 | "# Automatically generated by systemd-dbus1-generator\n\n" | |
66 | "[Unit]\n" | |
67 | "SourcePath=%s\n" | |
68 | "Description=DBUS1: %s\n" | |
69 | "Documentation=man:systemd-dbus1-generator(8)\n\n" | |
70 | "[Service]\n" | |
71 | "ExecStart=%s\n" | |
72 | "Type=dbus\n" | |
73 | "BusName=%s\n", | |
74 | path, | |
75 | name, | |
76 | exec, | |
77 | name); | |
78 | ||
79 | if (user) | |
80 | fprintf(f, "User=%s\n", user); | |
81 | ||
82 | ||
83 | if (type) { | |
84 | fprintf(f, "Environment=DBUS_STARTER_BUS_TYPE=%s\n", type); | |
85 | ||
86 | if (streq(type, "system")) | |
f47781d8 | 87 | fprintf(f, "Environment=DBUS_STARTER_ADDRESS=" DEFAULT_SYSTEM_BUS_ADDRESS "\n"); |
60f067b4 JS |
88 | else if (streq(type, "session")) { |
89 | char *run; | |
90 | ||
91 | run = getenv("XDG_RUNTIME_DIR"); | |
92 | if (!run) { | |
93 | log_error("XDG_RUNTIME_DIR not set."); | |
94 | return -EINVAL; | |
95 | } | |
96 | ||
f47781d8 | 97 | fprintf(f, "Environment=DBUS_STARTER_ADDRESS="KERNEL_USER_BUS_ADDRESS_FMT ";" UNIX_USER_BUS_ADDRESS_FMT "\n", |
60f067b4 JS |
98 | getuid(), run); |
99 | } | |
100 | } | |
101 | ||
5eef597e | 102 | r = fflush_and_check(f); |
f47781d8 MP |
103 | if (r < 0) |
104 | return log_error_errno(r, "Failed to write %s: %m", a); | |
60f067b4 | 105 | |
5eef597e MP |
106 | fclose(f); |
107 | f = NULL; | |
108 | ||
60f067b4 JS |
109 | service = s; |
110 | } | |
111 | ||
112 | b = strjoin(arg_dest_late, "/", name, ".busname", NULL); | |
113 | if (!b) | |
114 | return log_oom(); | |
115 | ||
116 | f = fopen(b, "wxe"); | |
f47781d8 MP |
117 | if (!f) |
118 | return log_error_errno(errno, "Failed to create %s: %m", b); | |
60f067b4 JS |
119 | |
120 | fprintf(f, | |
121 | "# Automatically generated by systemd-dbus1-generator\n\n" | |
122 | "[Unit]\n" | |
123 | "SourcePath=%s\n" | |
124 | "Description=DBUS1: %s\n" | |
125 | "Documentation=man:systemd-dbus1-generator(8)\n\n" | |
126 | "[BusName]\n" | |
127 | "Name=%s\n" | |
128 | "Service=%s\n" | |
129 | "AllowWorld=talk\n", | |
130 | path, | |
131 | name, | |
132 | name, | |
133 | service); | |
134 | ||
5eef597e | 135 | r = fflush_and_check(f); |
f47781d8 MP |
136 | if (r < 0) |
137 | return log_error_errno(r, "Failed to write %s: %m", b); | |
60f067b4 JS |
138 | |
139 | lnk = strjoin(arg_dest_late, "/" SPECIAL_BUSNAMES_TARGET ".wants/", name, ".busname", NULL); | |
140 | if (!lnk) | |
141 | return log_oom(); | |
142 | ||
143 | mkdir_parents_label(lnk, 0755); | |
f47781d8 MP |
144 | if (symlink(b, lnk)) |
145 | return log_error_errno(errno, "Failed to create symlink %s: %m", lnk); | |
60f067b4 JS |
146 | |
147 | return 0; | |
148 | } | |
149 | ||
150 | static int add_dbus(const char *path, const char *fname, const char *type) { | |
151 | _cleanup_free_ char *name = NULL, *exec = NULL, *user = NULL, *service = NULL; | |
152 | ||
5eef597e | 153 | const ConfigTableItem table[] = { |
60f067b4 JS |
154 | { "D-BUS Service", "Name", config_parse_string, 0, &name }, |
155 | { "D-BUS Service", "Exec", config_parse_string, 0, &exec }, | |
156 | { "D-BUS Service", "User", config_parse_string, 0, &user }, | |
157 | { "D-BUS Service", "SystemdService", config_parse_string, 0, &service }, | |
e735f4d4 | 158 | { }, |
60f067b4 JS |
159 | }; |
160 | ||
5eef597e | 161 | char *p; |
60f067b4 JS |
162 | int r; |
163 | ||
164 | assert(path); | |
165 | assert(fname); | |
166 | ||
e735f4d4 | 167 | p = strjoina(path, "/", fname); |
5eef597e MP |
168 | r = config_parse(NULL, p, NULL, |
169 | "D-BUS Service\0", | |
170 | config_item_table_lookup, table, | |
171 | true, false, true, NULL); | |
60f067b4 JS |
172 | if (r < 0) |
173 | return r; | |
174 | ||
175 | if (!name) { | |
176 | log_warning("Activation file %s lacks name setting, ignoring.", p); | |
177 | return 0; | |
178 | } | |
179 | ||
180 | if (!service_name_is_valid(name)) { | |
181 | log_warning("Bus service name %s is not valid, ignoring.", name); | |
182 | return 0; | |
183 | } | |
184 | ||
185 | if (streq(name, "org.freedesktop.systemd1")) { | |
186 | log_debug("Skipping %s, identified as systemd.", p); | |
187 | return 0; | |
188 | } | |
189 | ||
190 | if (service) { | |
191 | if (!unit_name_is_valid(service, TEMPLATE_INVALID)) { | |
192 | log_warning("Unit name %s is not valid, ignoring.", service); | |
193 | return 0; | |
194 | } | |
195 | if (!endswith(service, ".service")) { | |
196 | log_warning("Bus names can only activate services, ignoring %s.", p); | |
197 | return 0; | |
198 | } | |
199 | } else { | |
200 | if (streq(exec, "/bin/false") || !exec) { | |
201 | log_warning("Neither service name nor binary path specified, ignoring %s.", p); | |
202 | return 0; | |
203 | } | |
204 | ||
205 | if (exec[0] != '/') { | |
206 | log_warning("Exec= in %s does not start with an absolute path, ignoring.", p); | |
207 | return 0; | |
208 | } | |
209 | } | |
210 | ||
211 | return create_dbus_files(p, name, service, exec, user, type); | |
212 | } | |
213 | ||
214 | static int parse_dbus_fragments(const char *path, const char *type) { | |
215 | _cleanup_closedir_ DIR *d = NULL; | |
216 | struct dirent *de; | |
217 | int r; | |
218 | ||
219 | assert(path); | |
220 | assert(type); | |
221 | ||
222 | d = opendir(path); | |
223 | if (!d) { | |
224 | if (errno == -ENOENT) | |
225 | return 0; | |
226 | ||
f47781d8 | 227 | log_error_errno(errno, "Failed to enumerate D-Bus activated services: %m"); |
60f067b4 JS |
228 | return -errno; |
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: | |
f47781d8 | 246 | log_error_errno(errno, "Failed to read D-Bus services directory: %m"); |
60f067b4 JS |
247 | return -errno; |
248 | } | |
249 | ||
250 | static int link_busnames_target(const char *units) { | |
251 | const char *f, *t; | |
252 | ||
e735f4d4 MP |
253 | f = strjoina(units, "/" SPECIAL_BUSNAMES_TARGET); |
254 | t = strjoina(arg_dest, "/" SPECIAL_BASIC_TARGET ".wants/" SPECIAL_BUSNAMES_TARGET); | |
60f067b4 JS |
255 | |
256 | mkdir_parents_label(t, 0755); | |
f47781d8 MP |
257 | if (symlink(f, t) < 0) |
258 | return log_error_errno(errno, "Failed to create symlink %s: %m", t); | |
60f067b4 JS |
259 | |
260 | return 0; | |
261 | } | |
262 | ||
263 | static int link_compatibility(const char *units) { | |
264 | const char *f, *t; | |
265 | ||
e735f4d4 MP |
266 | f = strjoina(units, "/systemd-bus-proxyd.socket"); |
267 | t = strjoina(arg_dest, "/" SPECIAL_DBUS_SOCKET); | |
60f067b4 | 268 | mkdir_parents_label(t, 0755); |
f47781d8 MP |
269 | if (symlink(f, t) < 0) |
270 | return log_error_errno(errno, "Failed to create symlink %s: %m", t); | |
60f067b4 | 271 | |
e735f4d4 MP |
272 | f = strjoina(units, "/systemd-bus-proxyd.socket"); |
273 | t = strjoina(arg_dest, "/" SPECIAL_SOCKETS_TARGET ".wants/systemd-bus-proxyd.socket"); | |
60f067b4 | 274 | mkdir_parents_label(t, 0755); |
f47781d8 MP |
275 | if (symlink(f, t) < 0) |
276 | return log_error_errno(errno, "Failed to create symlink %s: %m", t); | |
60f067b4 | 277 | |
e735f4d4 | 278 | t = strjoina(arg_dest, "/" SPECIAL_DBUS_SERVICE); |
f47781d8 MP |
279 | if (symlink("/dev/null", t) < 0) |
280 | return log_error_errno(errno, "Failed to mask %s: %m", t); | |
60f067b4 JS |
281 | |
282 | return 0; | |
283 | } | |
284 | ||
285 | int main(int argc, char *argv[]) { | |
286 | const char *path, *type, *units; | |
287 | int r, q; | |
288 | ||
289 | if (argc > 1 && argc != 4) { | |
290 | log_error("This program takes three or no arguments."); | |
291 | return EXIT_FAILURE; | |
292 | } | |
293 | ||
294 | if (argc > 1) { | |
295 | arg_dest = argv[1]; | |
296 | arg_dest_late = argv[3]; | |
297 | } | |
298 | ||
299 | log_set_target(LOG_TARGET_SAFE); | |
300 | log_parse_environment(); | |
301 | log_open(); | |
302 | ||
303 | umask(0022); | |
304 | ||
f47781d8 | 305 | if (access("/sys/fs/kdbus/control", F_OK) < 0) |
60f067b4 JS |
306 | return 0; |
307 | ||
308 | r = cg_pid_get_owner_uid(0, NULL); | |
309 | if (r >= 0) { | |
310 | path = "/usr/share/dbus-1/services"; | |
311 | type = "session"; | |
312 | units = USER_DATA_UNIT_PATH; | |
313 | } else if (r == -ENOENT) { | |
314 | path = "/usr/share/dbus-1/system-services"; | |
315 | type = "system"; | |
316 | units = SYSTEM_DATA_UNIT_PATH; | |
f47781d8 MP |
317 | } else |
318 | return log_error_errno(r, "Failed to determine whether we are running as user or system instance: %m"); | |
60f067b4 JS |
319 | |
320 | r = parse_dbus_fragments(path, type); | |
321 | ||
322 | /* FIXME: One day this should just be pulled in statically from basic.target */ | |
323 | q = link_busnames_target(units); | |
324 | if (q < 0) | |
325 | r = q; | |
326 | ||
327 | q = link_compatibility(units); | |
328 | if (q < 0) | |
329 | r = q; | |
330 | ||
331 | return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS; | |
332 | } |