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Systemd/src/dbus1-generator/dbus1-generator.c
Lennart Poettering 63c372cb9d util: rework strappenda(), and rename it strjoina() 
After all it is now much more like strjoin() than strappend(). At the
same time, add support for NULL sentinels, even if they are normally not
necessary.
2015-02-03 02:05:59 +01:00

333 lines
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/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
/***
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 "util.h"
#include "conf-parser.h"
#include "special.h"
#include "mkdir.h"
#include "bus-util.h"
#include "bus-internal.h"
#include "unit-name.h"
#include "cgroup-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);
fclose(f);
f = NULL;
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, TEMPLATE_INVALID)) {
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;
log_error_errno(errno, "Failed to enumerate D-Bus activated services: %m");
return -errno;
}
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:
log_error_errno(errno, "Failed to read D-Bus services directory: %m");
return -errno;
}
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 (access("/sys/fs/kdbus/control", F_OK) < 0)
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 == -ENOENT) {
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;
}
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