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:/dev/kdbus/0-system\n");
88 else if (streq(type, "session"))
89 fprintf(f, "Environment=DBUS_STARTER_ADDRESS=kernel:/dev/kdbus/%lu-user\n", (unsigned long) getuid());
94 log_error("Failed to write %s: %m", a);
101 b = strjoin(arg_dest_late, "/", name, ".busname", NULL);
107 log_error("Failed to create %s: %m", b);
112 "# Automatically generated by systemd-dbus1-generator\n\n"
115 "Description=DBUS1: %s\n\n"
126 log_error("Failed to write %s: %m", b);
130 lnk = strjoin(arg_dest_late, "/" SPECIAL_BUSNAMES_TARGET ".wants/", name, ".busname", NULL);
134 mkdir_parents_label(lnk, 0755);
135 if (symlink(b, lnk)) {
136 log_error("Failed to create symlink %s: %m", lnk);
143 static int add_dbus(const char *path, const char *fname, const char *type) {
144 _cleanup_free_ char *name = NULL, *exec = NULL, *user = NULL, *service = NULL;
146 ConfigTableItem table[] = {
147 { "D-BUS Service", "Name", config_parse_string, 0, &name },
148 { "D-BUS Service", "Exec", config_parse_string, 0, &exec },
149 { "D-BUS Service", "User", config_parse_string, 0, &user },
150 { "D-BUS Service", "SystemdService", config_parse_string, 0, &service },
153 _cleanup_fclose_ FILE *f = NULL;
154 _cleanup_free_ char *p = NULL;
160 p = strjoin(path, "/", fname, NULL);
166 if (errno == -ENOENT)
169 log_error("Failed to read %s: %m", p);
173 r = config_parse(NULL, p, f, "D-BUS Service\0", config_item_table_lookup, table, true, false, NULL);
178 log_warning("Activation file %s lacks name setting, ignoring.", p);
182 if (!service_name_is_valid(name)) {
183 log_warning("Bus service name %s is not valid, ignoring.", name);
187 if (streq(name, "org.freedesktop.systemd1")) {
188 log_debug("Skipping %s, identified as systemd.", p);
193 if (!unit_name_is_valid(service, false)) {
194 log_warning("Unit name %s is not valid, ignoring.", service);
197 if (!endswith(service, ".service")) {
198 log_warning("Bus names can only activate services, ignoring %s.", p);
202 if (streq(exec, "/bin/false") || !exec) {
203 log_warning("Neither service name nor binary path specified, ignoring %s.", p);
207 if (exec[0] != '/') {
208 log_warning("Exec= in %s does not start with an absolute path, ignoring.", p);
213 return create_dbus_files(p, name, service, exec, user, type);
216 static int parse_dbus_fragments(const char *path, const char *type) {
217 _cleanup_closedir_ DIR *d = NULL;
226 if (errno == -ENOENT)
229 log_error("Failed to enumerate D-Bus activated services: %m");
234 FOREACH_DIRENT(de, d, goto fail) {
237 if (!endswith(de->d_name, ".service"))
240 q = add_dbus(path, de->d_name, type);
248 log_error("Failed to read D-Bus services directory: %m");
252 static int link_busnames_target(const char *units) {
255 f = strappenda(units, "/" SPECIAL_BUSNAMES_TARGET);
256 t = strappenda(arg_dest, "/" SPECIAL_BASIC_TARGET ".wants/" SPECIAL_BUSNAMES_TARGET);
258 mkdir_parents_label(t, 0755);
259 if (symlink(f, t) < 0) {
260 log_error("Failed to create symlink %s: %m", t);
267 static int link_compatibility(const char *units) {
270 f = strappenda(units, "/systemd-bus-proxyd.socket");
271 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 t = strappenda(arg_dest, "/" SPECIAL_DBUS_SERVICE);
280 if (symlink("/dev/null", t) < 0) {
281 log_error("Failed to mask %s: %m", t);
288 int main(int argc, char *argv[]) {
289 const char *path, *type, *units;
292 if (argc > 1 && argc != 4) {
293 log_error("This program takes three or no arguments.");
299 arg_dest_late = argv[3];
302 log_set_target(LOG_TARGET_SAFE);
303 log_parse_environment();
308 if (access("/dev/kdbus/control", F_OK) < 0)
311 r = cg_pid_get_owner_uid(0, NULL);
313 path = "/usr/share/dbus-1/services";
315 units = USER_DATA_UNIT_PATH;
316 } else if (r == -ENOENT) {
317 path = "/usr/share/dbus-1/system-services";
319 units = SYSTEM_DATA_UNIT_PATH;
321 log_error("Failed to determine whether we are running as user or system instance: %s", strerror(-r));
325 r = parse_dbus_fragments(path, type);
327 /* FIXME: One day this should just be pulled in statically from basic.target */
328 q = link_busnames_target(units);
332 q = link_compatibility(units);
336 return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;