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Diffstat (limited to 'src/systemd-dbus1-generator/dbus1-generator.c')
-rw-r--r--src/systemd-dbus1-generator/dbus1-generator.c331
1 files changed, 331 insertions, 0 deletions
diff --git a/src/systemd-dbus1-generator/dbus1-generator.c b/src/systemd-dbus1-generator/dbus1-generator.c
new file mode 100644
index 0000000000..717cb9558e
--- /dev/null
+++ b/src/systemd-dbus1-generator/dbus1-generator.c
@@ -0,0 +1,331 @@
+/***
+ This file is part of systemd.
+
+ Copyright 2013 Lennart Poettering
+
+ systemd is free software; you can redistribute it and/or modify it
+ under the terms of the GNU Lesser General Public License as published by
+ the Free Software Foundation; either version 2.1 of the License, or
+ (at your option) any later version.
+
+ systemd is distributed in the hope that it will be useful, but
+ WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public License
+ along with systemd; If not, see <http://www.gnu.org/licenses/>.
+***/
+
+#include "alloc-util.h"
+#include "bus-internal.h"
+#include "bus-util.h"
+#include "cgroup-util.h"
+#include "conf-parser.h"
+#include "dirent-util.h"
+#include "fd-util.h"
+#include "fileio.h"
+#include "mkdir.h"
+#include "special.h"
+#include "unit-name.h"
+#include "util.h"
+
+static const char *arg_dest_late = "/tmp", *arg_dest = "/tmp";
+
+static int create_dbus_files(
+ const char *path,
+ const char *name,
+ const char *service,
+ const char *exec,
+ const char *user,
+ const char *type) {
+
+ _cleanup_free_ char *b = NULL, *s = NULL, *lnk = NULL;
+ _cleanup_fclose_ FILE *f = NULL;
+ int r;
+
+ assert(path);
+ assert(name);
+ assert(service || exec);
+
+ if (!service) {
+ _cleanup_free_ char *a = NULL;
+
+ s = strjoin("dbus-", name, ".service", NULL);
+ if (!s)
+ return log_oom();
+
+ a = strjoin(arg_dest_late, "/", s, NULL);
+ if (!a)
+ return log_oom();
+
+ f = fopen(a, "wxe");
+ if (!f)
+ return log_error_errno(errno, "Failed to create %s: %m", a);
+
+ fprintf(f,
+ "# Automatically generated by systemd-dbus1-generator\n\n"
+ "[Unit]\n"
+ "SourcePath=%s\n"
+ "Description=DBUS1: %s\n"
+ "Documentation=man:systemd-dbus1-generator(8)\n\n"
+ "[Service]\n"
+ "ExecStart=%s\n"
+ "Type=dbus\n"
+ "BusName=%s\n",
+ path,
+ name,
+ exec,
+ name);
+
+ if (user)
+ fprintf(f, "User=%s\n", user);
+
+
+ if (type) {
+ fprintf(f, "Environment=DBUS_STARTER_BUS_TYPE=%s\n", type);
+
+ if (streq(type, "system"))
+ fprintf(f, "Environment=DBUS_STARTER_ADDRESS=" DEFAULT_SYSTEM_BUS_ADDRESS "\n");
+ else if (streq(type, "session")) {
+ char *run;
+
+ run = getenv("XDG_RUNTIME_DIR");
+ if (!run) {
+ log_error("XDG_RUNTIME_DIR not set.");
+ return -EINVAL;
+ }
+
+ fprintf(f, "Environment=DBUS_STARTER_ADDRESS="KERNEL_USER_BUS_ADDRESS_FMT ";" UNIX_USER_BUS_ADDRESS_FMT "\n",
+ getuid(), run);
+ }
+ }
+
+ r = fflush_and_check(f);
+ if (r < 0)
+ return log_error_errno(r, "Failed to write %s: %m", a);
+
+ f = safe_fclose(f);
+
+ service = s;
+ }
+
+ b = strjoin(arg_dest_late, "/", name, ".busname", NULL);
+ if (!b)
+ return log_oom();
+
+ f = fopen(b, "wxe");
+ if (!f)
+ return log_error_errno(errno, "Failed to create %s: %m", b);
+
+ fprintf(f,
+ "# Automatically generated by systemd-dbus1-generator\n\n"
+ "[Unit]\n"
+ "SourcePath=%s\n"
+ "Description=DBUS1: %s\n"
+ "Documentation=man:systemd-dbus1-generator(8)\n\n"
+ "[BusName]\n"
+ "Name=%s\n"
+ "Service=%s\n"
+ "AllowWorld=talk\n",
+ path,
+ name,
+ name,
+ service);
+
+ r = fflush_and_check(f);
+ if (r < 0)
+ return log_error_errno(r, "Failed to write %s: %m", b);
+
+ lnk = strjoin(arg_dest_late, "/" SPECIAL_BUSNAMES_TARGET ".wants/", name, ".busname", NULL);
+ if (!lnk)
+ return log_oom();
+
+ mkdir_parents_label(lnk, 0755);
+ if (symlink(b, lnk))
+ return log_error_errno(errno, "Failed to create symlink %s: %m", lnk);
+
+ return 0;
+}
+
+static int add_dbus(const char *path, const char *fname, const char *type) {
+ _cleanup_free_ char *name = NULL, *exec = NULL, *user = NULL, *service = NULL;
+
+ const ConfigTableItem table[] = {
+ { "D-BUS Service", "Name", config_parse_string, 0, &name },
+ { "D-BUS Service", "Exec", config_parse_string, 0, &exec },
+ { "D-BUS Service", "User", config_parse_string, 0, &user },
+ { "D-BUS Service", "SystemdService", config_parse_string, 0, &service },
+ { },
+ };
+
+ char *p;
+ int r;
+
+ assert(path);
+ assert(fname);
+
+ p = strjoina(path, "/", fname);
+ r = config_parse(NULL, p, NULL,
+ "D-BUS Service\0",
+ config_item_table_lookup, table,
+ true, false, true, NULL);
+ if (r < 0)
+ return r;
+
+ if (!name) {
+ log_warning("Activation file %s lacks name setting, ignoring.", p);
+ return 0;
+ }
+
+ if (!service_name_is_valid(name)) {
+ log_warning("Bus service name %s is not valid, ignoring.", name);
+ return 0;
+ }
+
+ if (streq(name, "org.freedesktop.systemd1")) {
+ log_debug("Skipping %s, identified as systemd.", p);
+ return 0;
+ }
+
+ if (service) {
+ if (!unit_name_is_valid(service, UNIT_NAME_PLAIN|UNIT_NAME_INSTANCE)) {
+ log_warning("Unit name %s is not valid, ignoring.", service);
+ return 0;
+ }
+ if (!endswith(service, ".service")) {
+ log_warning("Bus names can only activate services, ignoring %s.", p);
+ return 0;
+ }
+ } else {
+ if (streq(exec, "/bin/false") || !exec) {
+ log_warning("Neither service name nor binary path specified, ignoring %s.", p);
+ return 0;
+ }
+
+ if (exec[0] != '/') {
+ log_warning("Exec= in %s does not start with an absolute path, ignoring.", p);
+ return 0;
+ }
+ }
+
+ return create_dbus_files(p, name, service, exec, user, type);
+}
+
+static int parse_dbus_fragments(const char *path, const char *type) {
+ _cleanup_closedir_ DIR *d = NULL;
+ struct dirent *de;
+ int r;
+
+ assert(path);
+ assert(type);
+
+ d = opendir(path);
+ if (!d) {
+ if (errno == -ENOENT)
+ return 0;
+
+ return log_error_errno(errno, "Failed to enumerate D-Bus activated services: %m");
+ }
+
+ r = 0;
+ FOREACH_DIRENT(de, d, goto fail) {
+ int q;
+
+ if (!endswith(de->d_name, ".service"))
+ continue;
+
+ q = add_dbus(path, de->d_name, type);
+ if (q < 0)
+ r = q;
+ }
+
+ return r;
+
+fail:
+ return log_error_errno(errno, "Failed to read D-Bus services directory: %m");
+}
+
+static int link_busnames_target(const char *units) {
+ const char *f, *t;
+
+ f = strjoina(units, "/" SPECIAL_BUSNAMES_TARGET);
+ t = strjoina(arg_dest, "/" SPECIAL_BASIC_TARGET ".wants/" SPECIAL_BUSNAMES_TARGET);
+
+ mkdir_parents_label(t, 0755);
+ if (symlink(f, t) < 0)
+ return log_error_errno(errno, "Failed to create symlink %s: %m", t);
+
+ return 0;
+}
+
+static int link_compatibility(const char *units) {
+ const char *f, *t;
+
+ f = strjoina(units, "/systemd-bus-proxyd.socket");
+ t = strjoina(arg_dest, "/" SPECIAL_DBUS_SOCKET);
+ mkdir_parents_label(t, 0755);
+ if (symlink(f, t) < 0)
+ return log_error_errno(errno, "Failed to create symlink %s: %m", t);
+
+ f = strjoina(units, "/systemd-bus-proxyd.socket");
+ t = strjoina(arg_dest, "/" SPECIAL_SOCKETS_TARGET ".wants/systemd-bus-proxyd.socket");
+ mkdir_parents_label(t, 0755);
+ if (symlink(f, t) < 0)
+ return log_error_errno(errno, "Failed to create symlink %s: %m", t);
+
+ t = strjoina(arg_dest, "/" SPECIAL_DBUS_SERVICE);
+ if (symlink("/dev/null", t) < 0)
+ return log_error_errno(errno, "Failed to mask %s: %m", t);
+
+ return 0;
+}
+
+int main(int argc, char *argv[]) {
+ const char *path, *type, *units;
+ int r, q;
+
+ if (argc > 1 && argc != 4) {
+ log_error("This program takes three or no arguments.");
+ return EXIT_FAILURE;
+ }
+
+ if (argc > 1) {
+ arg_dest = argv[1];
+ arg_dest_late = argv[3];
+ }
+
+ log_set_target(LOG_TARGET_SAFE);
+ log_parse_environment();
+ log_open();
+
+ umask(0022);
+
+ if (!is_kdbus_available())
+ return 0;
+
+ r = cg_pid_get_owner_uid(0, NULL);
+ if (r >= 0) {
+ path = "/usr/share/dbus-1/services";
+ type = "session";
+ units = USER_DATA_UNIT_PATH;
+ } else if (r == -ENXIO) {
+ path = "/usr/share/dbus-1/system-services";
+ type = "system";
+ units = SYSTEM_DATA_UNIT_PATH;
+ } else
+ return log_error_errno(r, "Failed to determine whether we are running as user or system instance: %m");
+
+ r = parse_dbus_fragments(path, type);
+
+ /* FIXME: One day this should just be pulled in statically from basic.target */
+ q = link_busnames_target(units);
+ if (q < 0)
+ r = q;
+
+ q = link_compatibility(units);
+ if (q < 0)
+ r = q;
+
+ return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;
+}