1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
4 This file is part of systemd.
6 Copyright 2013 Lennart Poettering
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.
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.
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/>.
23 #include "conf-parser.h"
27 #include "bus-internal.h"
28 #include "unit-name.h"
29 #include "cgroup-util.h"
31 static const char *arg_dest_late = "/tmp", *arg_dest = "/tmp";
33 static int create_dbus_files(
41 _cleanup_free_ char *b = NULL, *s = NULL, *lnk = NULL;
42 _cleanup_fclose_ FILE *f = NULL;
47 assert(service || exec);
50 _cleanup_free_ char *a = NULL;
52 s = strjoin("dbus-", name, ".service", NULL);
56 a = strjoin(arg_dest_late, "/", s, NULL);
62 return log_error_errno(errno, "Failed to create %s: %m", a);
65 "# Automatically generated by systemd-dbus1-generator\n\n"
68 "Description=DBUS1: %s\n"
69 "Documentation=man:systemd-dbus1-generator(8)\n\n"
80 fprintf(f, "User=%s\n", user);
84 fprintf(f, "Environment=DBUS_STARTER_BUS_TYPE=%s\n", type);
86 if (streq(type, "system"))
87 fprintf(f, "Environment=DBUS_STARTER_ADDRESS=" DEFAULT_SYSTEM_BUS_ADDRESS "\n");
88 else if (streq(type, "session")) {
91 run = getenv("XDG_RUNTIME_DIR");
93 log_error("XDG_RUNTIME_DIR not set.");
97 fprintf(f, "Environment=DBUS_STARTER_ADDRESS="KERNEL_USER_BUS_ADDRESS_FMT ";" UNIX_USER_BUS_ADDRESS_FMT "\n",
102 r = fflush_and_check(f);
104 return log_error_errno(r, "Failed to write %s: %m", a);
112 b = strjoin(arg_dest_late, "/", name, ".busname", NULL);
118 return log_error_errno(errno, "Failed to create %s: %m", b);
121 "# Automatically generated by systemd-dbus1-generator\n\n"
124 "Description=DBUS1: %s\n"
125 "Documentation=man:systemd-dbus1-generator(8)\n\n"
135 r = fflush_and_check(f);
137 return log_error_errno(r, "Failed to write %s: %m", b);
139 lnk = strjoin(arg_dest_late, "/" SPECIAL_BUSNAMES_TARGET ".wants/", name, ".busname", NULL);
143 mkdir_parents_label(lnk, 0755);
145 return log_error_errno(errno, "Failed to create symlink %s: %m", lnk);
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;
153 const ConfigTableItem table[] = {
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 },
166 p = strappenda(path, "/", fname);
167 r = config_parse(NULL, p, NULL,
169 config_item_table_lookup, table,
170 true, false, true, NULL);
175 log_warning("Activation file %s lacks name setting, ignoring.", p);
179 if (!service_name_is_valid(name)) {
180 log_warning("Bus service name %s is not valid, ignoring.", name);
184 if (streq(name, "org.freedesktop.systemd1")) {
185 log_debug("Skipping %s, identified as systemd.", p);
190 if (!unit_name_is_valid(service, TEMPLATE_INVALID)) {
191 log_warning("Unit name %s is not valid, ignoring.", service);
194 if (!endswith(service, ".service")) {
195 log_warning("Bus names can only activate services, ignoring %s.", p);
199 if (streq(exec, "/bin/false") || !exec) {
200 log_warning("Neither service name nor binary path specified, ignoring %s.", p);
204 if (exec[0] != '/') {
205 log_warning("Exec= in %s does not start with an absolute path, ignoring.", p);
210 return create_dbus_files(p, name, service, exec, user, type);
213 static int parse_dbus_fragments(const char *path, const char *type) {
214 _cleanup_closedir_ DIR *d = NULL;
223 if (errno == -ENOENT)
226 log_error_errno(errno, "Failed to enumerate D-Bus activated services: %m");
231 FOREACH_DIRENT(de, d, goto fail) {
234 if (!endswith(de->d_name, ".service"))
237 q = add_dbus(path, de->d_name, type);
245 log_error_errno(errno, "Failed to read D-Bus services directory: %m");
249 static int link_busnames_target(const char *units) {
252 f = strappenda(units, "/" SPECIAL_BUSNAMES_TARGET);
253 t = strappenda(arg_dest, "/" SPECIAL_BASIC_TARGET ".wants/" SPECIAL_BUSNAMES_TARGET);
255 mkdir_parents_label(t, 0755);
256 if (symlink(f, t) < 0)
257 return log_error_errno(errno, "Failed to create symlink %s: %m", t);
262 static int link_compatibility(const char *units) {
265 f = strappenda(units, "/systemd-bus-proxyd.socket");
266 t = strappenda(arg_dest, "/" SPECIAL_DBUS_SOCKET);
267 mkdir_parents_label(t, 0755);
268 if (symlink(f, t) < 0)
269 return log_error_errno(errno, "Failed to create symlink %s: %m", t);
271 f = strappenda(units, "/systemd-bus-proxyd.socket");
272 t = strappenda(arg_dest, "/" SPECIAL_SOCKETS_TARGET ".wants/systemd-bus-proxyd.socket");
273 mkdir_parents_label(t, 0755);
274 if (symlink(f, t) < 0)
275 return log_error_errno(errno, "Failed to create symlink %s: %m", t);
277 t = strappenda(arg_dest, "/" SPECIAL_DBUS_SERVICE);
278 if (symlink("/dev/null", t) < 0)
279 return log_error_errno(errno, "Failed to mask %s: %m", t);
284 int main(int argc, char *argv[]) {
285 const char *path, *type, *units;
288 if (argc > 1 && argc != 4) {
289 log_error("This program takes three or no arguments.");
295 arg_dest_late = argv[3];
298 log_set_target(LOG_TARGET_SAFE);
299 log_parse_environment();
304 if (access("/sys/fs/kdbus/control", F_OK) < 0)
307 r = cg_pid_get_owner_uid(0, NULL);
309 path = "/usr/share/dbus-1/services";
311 units = USER_DATA_UNIT_PATH;
312 } else if (r == -ENOENT) {
313 path = "/usr/share/dbus-1/system-services";
315 units = SYSTEM_DATA_UNIT_PATH;
317 return log_error_errno(r, "Failed to determine whether we are running as user or system instance: %m");
319 r = parse_dbus_fragments(path, type);
321 /* FIXME: One day this should just be pulled in statically from basic.target */
322 q = link_busnames_target(units);
326 q = link_compatibility(units);
330 return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;