| /*-*- 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, 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; |
| |
| 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 (!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; |
| } |