/*-*- 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; }