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;
46 assert(service || exec);
49 _cleanup_free_ char *a = NULL;
51 s = strjoin("dbus-", name, ".service", NULL);
55 a = strjoin(arg_dest_late, "/", s, NULL);
61 log_error("Failed to create %s: %m", a);
66 "# Automatically generated by systemd-dbus1-generator\n\n"
69 "Description=DBUS1: %s\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=kernel:path=/dev/kdbus/0-system\n");
88 else if (streq(type, "session"))
89 fprintf(f, "Environment=DBUS_STARTER_ADDRESS=kernel:path=/dev/kdbus/%lu-user;unix:path=/run/user/%lu/bus\n",
90 (unsigned long) getuid(), (unsigned long) getuid());
95 log_error("Failed to write %s: %m", a);
102 b = strjoin(arg_dest_late, "/", name, ".busname", NULL);
108 log_error("Failed to create %s: %m", b);
113 "# Automatically generated by systemd-dbus1-generator\n\n"
116 "Description=DBUS1: %s\n\n"
127 log_error("Failed to write %s: %m", b);
131 lnk = strjoin(arg_dest_late, "/" SPECIAL_BUSNAMES_TARGET ".wants/", name, ".busname", NULL);
135 mkdir_parents_label(lnk, 0755);
136 if (symlink(b, lnk)) {
137 log_error("Failed to create symlink %s: %m", lnk);
144 static int add_dbus(const char *path, const char *fname, const char *type) {
145 _cleanup_free_ char *name = NULL, *exec = NULL, *user = NULL, *service = NULL;
147 ConfigTableItem table[] = {
148 { "D-BUS Service", "Name", config_parse_string, 0, &name },
149 { "D-BUS Service", "Exec", config_parse_string, 0, &exec },
150 { "D-BUS Service", "User", config_parse_string, 0, &user },
151 { "D-BUS Service", "SystemdService", config_parse_string, 0, &service },
154 _cleanup_fclose_ FILE *f = NULL;
155 _cleanup_free_ char *p = NULL;
161 p = strjoin(path, "/", fname, NULL);
167 if (errno == -ENOENT)
170 log_error("Failed to read %s: %m", p);
174 r = config_parse(NULL, p, f, "D-BUS Service\0", config_item_table_lookup, table, true, false, NULL);
179 log_warning("Activation file %s lacks name setting, ignoring.", p);
183 if (!service_name_is_valid(name)) {
184 log_warning("Bus service name %s is not valid, ignoring.", name);
188 if (streq(name, "org.freedesktop.systemd1")) {
189 log_debug("Skipping %s, identified as systemd.", p);
194 if (!unit_name_is_valid(service, TEMPLATE_INVALID)) {
195 log_warning("Unit name %s is not valid, ignoring.", service);
198 if (!endswith(service, ".service")) {
199 log_warning("Bus names can only activate services, ignoring %s.", p);
203 if (streq(exec, "/bin/false") || !exec) {
204 log_warning("Neither service name nor binary path specified, ignoring %s.", p);
208 if (exec[0] != '/') {
209 log_warning("Exec= in %s does not start with an absolute path, ignoring.", p);
214 return create_dbus_files(p, name, service, exec, user, type);
217 static int parse_dbus_fragments(const char *path, const char *type) {
218 _cleanup_closedir_ DIR *d = NULL;
227 if (errno == -ENOENT)
230 log_error("Failed to enumerate D-Bus activated services: %m");
235 FOREACH_DIRENT(de, d, goto fail) {
238 if (!endswith(de->d_name, ".service"))
241 q = add_dbus(path, de->d_name, type);
249 log_error("Failed to read D-Bus services directory: %m");
253 static int link_busnames_target(const char *units) {
256 f = strappenda(units, "/" SPECIAL_BUSNAMES_TARGET);
257 t = strappenda(arg_dest, "/" SPECIAL_BASIC_TARGET ".wants/" SPECIAL_BUSNAMES_TARGET);
259 mkdir_parents_label(t, 0755);
260 if (symlink(f, t) < 0) {
261 log_error("Failed to create symlink %s: %m", t);
268 static int link_compatibility(const char *units) {
271 f = strappenda(units, "/systemd-bus-proxyd.socket");
272 t = strappenda(arg_dest, "/" SPECIAL_DBUS_SOCKET);
273 mkdir_parents_label(t, 0755);
274 if (symlink(f, t) < 0) {
275 log_error("Failed to create symlink %s: %m", t);
279 f = strappenda(units, "/systemd-bus-proxyd.socket");
280 t = strappenda(arg_dest, "/" SPECIAL_SOCKETS_TARGET ".wants/systemd-bus-proxyd.socket");
281 mkdir_parents_label(t, 0755);
282 if (symlink(f, t) < 0) {
283 log_error("Failed to create symlink %s: %m", t);
287 t = strappenda(arg_dest, "/" SPECIAL_DBUS_SERVICE);
288 if (symlink("/dev/null", t) < 0) {
289 log_error("Failed to mask %s: %m", t);
296 int main(int argc, char *argv[]) {
297 const char *path, *type, *units;
300 if (argc > 1 && argc != 4) {
301 log_error("This program takes three or no arguments.");
307 arg_dest_late = argv[3];
310 log_set_target(LOG_TARGET_SAFE);
311 log_parse_environment();
316 if (access("/dev/kdbus/control", F_OK) < 0)
319 r = cg_pid_get_owner_uid(0, NULL);
321 path = "/usr/share/dbus-1/services";
323 units = USER_DATA_UNIT_PATH;
324 } else if (r == -ENOENT) {
325 path = "/usr/share/dbus-1/system-services";
327 units = SYSTEM_DATA_UNIT_PATH;
329 log_error("Failed to determine whether we are running as user or system instance: %s", strerror(-r));
333 r = parse_dbus_fragments(path, type);
335 /* FIXME: One day this should just be pulled in statically from basic.target */
336 q = link_busnames_target(units);
340 q = link_compatibility(units);
344 return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;