/*** 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 . ***/ #include #include #include #include #include #include #include #include #include #include #include "sd-bus-protocol.h" #include "sd-bus.h" #include "sd-daemon.h" #include "sd-event.h" #include "sd-id128.h" #include "alloc-util.h" #include "bus-internal.h" #include "bus-label.h" #include "bus-message.h" #include "bus-util.h" #include "cgroup-util.h" #include "def.h" #include "env-util.h" #include "escape.h" #include "extract-word.h" #include "fd-util.h" #include "hashmap.h" #include "install.h" #include "kdbus.h" #include "log.h" #include "macro.h" #include "missing.h" #include "parse-util.h" #include "path-util.h" #include "proc-cmdline.h" #include "process-util.h" #include "rlimit-util.h" #include "set.h" #include "signal-util.h" #include "stdio-util.h" #include "string-util.h" #include "strv.h" #include "syslog-util.h" #include "time-util.h" #include "unit-name.h" #include "user-util.h" #include "utf8.h" #include "util.h" static int name_owner_change_callback(sd_bus_message *m, void *userdata, sd_bus_error *ret_error) { sd_event *e = userdata; assert(m); assert(e); sd_bus_close(sd_bus_message_get_bus(m)); sd_event_exit(e, 0); return 1; } int bus_async_unregister_and_exit(sd_event *e, sd_bus *bus, const char *name) { _cleanup_free_ char *match = NULL; const char *unique; int r; assert(e); assert(bus); assert(name); /* We unregister the name here and then wait for the * NameOwnerChanged signal for this event to arrive before we * quit. We do this in order to make sure that any queued * requests are still processed before we really exit. */ r = sd_bus_get_unique_name(bus, &unique); if (r < 0) return r; r = asprintf(&match, "sender='org.freedesktop.DBus'," "type='signal'," "interface='org.freedesktop.DBus'," "member='NameOwnerChanged'," "path='/org/freedesktop/DBus'," "arg0='%s'," "arg1='%s'," "arg2=''", name, unique); if (r < 0) return -ENOMEM; r = sd_bus_add_match(bus, NULL, match, name_owner_change_callback, e); if (r < 0) return r; r = sd_bus_release_name(bus, name); if (r < 0) return r; return 0; } int bus_event_loop_with_idle( sd_event *e, sd_bus *bus, const char *name, usec_t timeout, check_idle_t check_idle, void *userdata) { bool exiting = false; int r, code; assert(e); assert(bus); assert(name); for (;;) { bool idle; r = sd_event_get_state(e); if (r < 0) return r; if (r == SD_EVENT_FINISHED) break; if (check_idle) idle = check_idle(userdata); else idle = true; r = sd_event_run(e, exiting || !idle ? (uint64_t) -1 : timeout); if (r < 0) return r; if (r == 0 && !exiting && idle) { r = sd_bus_try_close(bus); if (r == -EBUSY) continue; /* Fallback for dbus1 connections: we * unregister the name and wait for the * response to come through for it */ if (r == -EOPNOTSUPP) { /* Inform the service manager that we * are going down, so that it will * queue all further start requests, * instead of assuming we are already * running. */ sd_notify(false, "STOPPING=1"); r = bus_async_unregister_and_exit(e, bus, name); if (r < 0) return r; exiting = true; continue; } if (r < 0) return r; sd_event_exit(e, 0); break; } } r = sd_event_get_exit_code(e, &code); if (r < 0) return r; return code; } int bus_name_has_owner(sd_bus *c, const char *name, sd_bus_error *error) { _cleanup_(sd_bus_message_unrefp) sd_bus_message *rep = NULL; int r, has_owner = 0; assert(c); assert(name); r = sd_bus_call_method(c, "org.freedesktop.DBus", "/org/freedesktop/dbus", "org.freedesktop.DBus", "NameHasOwner", error, &rep, "s", name); if (r < 0) return r; r = sd_bus_message_read_basic(rep, 'b', &has_owner); if (r < 0) return sd_bus_error_set_errno(error, r); return has_owner; } static int check_good_user(sd_bus_message *m, uid_t good_user) { _cleanup_(sd_bus_creds_unrefp) sd_bus_creds *creds = NULL; uid_t sender_uid; int r; assert(m); if (good_user == UID_INVALID) return 0; r = sd_bus_query_sender_creds(m, SD_BUS_CREDS_EUID, &creds); if (r < 0) return r; /* Don't trust augmented credentials for authorization */ assert_return((sd_bus_creds_get_augmented_mask(creds) & SD_BUS_CREDS_EUID) == 0, -EPERM); r = sd_bus_creds_get_euid(creds, &sender_uid); if (r < 0) return r; return sender_uid == good_user; } int bus_test_polkit( sd_bus_message *call, int capability, const char *action, const char **details, uid_t good_user, bool *_challenge, sd_bus_error *e) { int r; assert(call); assert(action); /* Tests non-interactively! */ r = check_good_user(call, good_user); if (r != 0) return r; r = sd_bus_query_sender_privilege(call, capability); if (r < 0) return r; else if (r > 0) return 1; #ifdef ENABLE_POLKIT else { _cleanup_(sd_bus_message_unrefp) sd_bus_message *request = NULL; _cleanup_(sd_bus_message_unrefp) sd_bus_message *reply = NULL; int authorized = false, challenge = false; const char *sender, **k, **v; sender = sd_bus_message_get_sender(call); if (!sender) return -EBADMSG; r = sd_bus_message_new_method_call( call->bus, &request, "org.freedesktop.PolicyKit1", "/org/freedesktop/PolicyKit1/Authority", "org.freedesktop.PolicyKit1.Authority", "CheckAuthorization"); if (r < 0) return r; r = sd_bus_message_append( request, "(sa{sv})s", "system-bus-name", 1, "name", "s", sender, action); if (r < 0) return r; r = sd_bus_message_open_container(request, 'a', "{ss}"); if (r < 0) return r; STRV_FOREACH_PAIR(k, v, details) { r = sd_bus_message_append(request, "{ss}", *k, *v); if (r < 0) return r; } r = sd_bus_message_close_container(request); if (r < 0) return r; r = sd_bus_message_append(request, "us", 0, NULL); if (r < 0) return r; r = sd_bus_call(call->bus, request, 0, e, &reply); if (r < 0) { /* Treat no PK available as access denied */ if (sd_bus_error_has_name(e, SD_BUS_ERROR_SERVICE_UNKNOWN)) { sd_bus_error_free(e); return -EACCES; } return r; } r = sd_bus_message_enter_container(reply, 'r', "bba{ss}"); if (r < 0) return r; r = sd_bus_message_read(reply, "bb", &authorized, &challenge); if (r < 0) return r; if (authorized) return 1; if (_challenge) { *_challenge = challenge; return 0; } } #endif return -EACCES; } #ifdef ENABLE_POLKIT typedef struct AsyncPolkitQuery { sd_bus_message *request, *reply; sd_bus_message_handler_t callback; void *userdata; sd_bus_slot *slot; Hashmap *registry; } AsyncPolkitQuery; static void async_polkit_query_free(AsyncPolkitQuery *q) { if (!q) return; sd_bus_slot_unref(q->slot); if (q->registry && q->request) hashmap_remove(q->registry, q->request); sd_bus_message_unref(q->request); sd_bus_message_unref(q->reply); free(q); } static int async_polkit_callback(sd_bus_message *reply, void *userdata, sd_bus_error *error) { _cleanup_(sd_bus_error_free) sd_bus_error error_buffer = SD_BUS_ERROR_NULL; AsyncPolkitQuery *q = userdata; int r; assert(reply); assert(q); q->slot = sd_bus_slot_unref(q->slot); q->reply = sd_bus_message_ref(reply); r = sd_bus_message_rewind(q->request, true); if (r < 0) { r = sd_bus_reply_method_errno(q->request, r, NULL); goto finish; } r = q->callback(q->request, q->userdata, &error_buffer); r = bus_maybe_reply_error(q->request, r, &error_buffer); finish: async_polkit_query_free(q); return r; } #endif int bus_verify_polkit_async( sd_bus_message *call, int capability, const char *action, const char **details, bool interactive, uid_t good_user, Hashmap **registry, sd_bus_error *error) { #ifdef ENABLE_POLKIT _cleanup_(sd_bus_message_unrefp) sd_bus_message *pk = NULL; AsyncPolkitQuery *q; const char *sender, **k, **v; sd_bus_message_handler_t callback; void *userdata; int c; #endif int r; assert(call); assert(action); assert(registry); r = check_good_user(call, good_user); if (r != 0) return r; #ifdef ENABLE_POLKIT q = hashmap_get(*registry, call); if (q) { int authorized, challenge; /* This is the second invocation of this function, and * there's already a response from polkit, let's * process it */ assert(q->reply); if (sd_bus_message_is_method_error(q->reply, NULL)) { const sd_bus_error *e; /* Copy error from polkit reply */ e = sd_bus_message_get_error(q->reply); sd_bus_error_copy(error, e); /* Treat no PK available as access denied */ if (sd_bus_error_has_name(e, SD_BUS_ERROR_SERVICE_UNKNOWN)) return -EACCES; return -sd_bus_error_get_errno(e); } r = sd_bus_message_enter_container(q->reply, 'r', "bba{ss}"); if (r >= 0) r = sd_bus_message_read(q->reply, "bb", &authorized, &challenge); if (r < 0) return r; if (authorized) return 1; if (challenge) return sd_bus_error_set(error, SD_BUS_ERROR_INTERACTIVE_AUTHORIZATION_REQUIRED, "Interactive authentication required."); return -EACCES; } #endif r = sd_bus_query_sender_privilege(call, capability); if (r < 0) return r; else if (r > 0) return 1; #ifdef ENABLE_POLKIT if (sd_bus_get_current_message(call->bus) != call) return -EINVAL; callback = sd_bus_get_current_handler(call->bus); if (!callback) return -EINVAL; userdata = sd_bus_get_current_userdata(call->bus); sender = sd_bus_message_get_sender(call); if (!sender) return -EBADMSG; c = sd_bus_message_get_allow_interactive_authorization(call); if (c < 0) return c; if (c > 0) interactive = true; r = hashmap_ensure_allocated(registry, NULL); if (r < 0) return r; r = sd_bus_message_new_method_call( call->bus, &pk, "org.freedesktop.PolicyKit1", "/org/freedesktop/PolicyKit1/Authority", "org.freedesktop.PolicyKit1.Authority", "CheckAuthorization"); if (r < 0) return r; r = sd_bus_message_append( pk, "(sa{sv})s", "system-bus-name", 1, "name", "s", sender, action); if (r < 0) return r; r = sd_bus_message_open_container(pk, 'a', "{ss}"); if (r < 0) return r; STRV_FOREACH_PAIR(k, v, details) { r = sd_bus_message_append(pk, "{ss}", *k, *v); if (r < 0) return r; } r = sd_bus_message_close_container(pk); if (r < 0) return r; r = sd_bus_message_append(pk, "us", !!interactive, NULL); if (r < 0) return r; q = new0(AsyncPolkitQuery, 1); if (!q) return -ENOMEM; q->request = sd_bus_message_ref(call); q->callback = callback; q->userdata = userdata; r = hashmap_put(*registry, call, q); if (r < 0) { async_polkit_query_free(q); return r; } q->registry = *registry; r = sd_bus_call_async(call->bus, &q->slot, pk, async_polkit_callback, q, 0); if (r < 0) { async_polkit_query_free(q); return r; } return 0; #endif return -EACCES; } void bus_verify_polkit_async_registry_free(Hashmap *registry) { #ifdef ENABLE_POLKIT AsyncPolkitQuery *q; while ((q = hashmap_steal_first(registry))) async_polkit_query_free(q); hashmap_free(registry); #endif } int bus_check_peercred(sd_bus *c) { struct ucred ucred; socklen_t l; int fd; assert(c); fd = sd_bus_get_fd(c); if (fd < 0) return fd; l = sizeof(struct ucred); if (getsockopt(fd, SOL_SOCKET, SO_PEERCRED, &ucred, &l) < 0) return -errno; if (l != sizeof(struct ucred)) return -E2BIG; if (ucred.uid != 0 && ucred.uid != geteuid()) return -EPERM; return 1; } int bus_connect_system_systemd(sd_bus **_bus) { _cleanup_(sd_bus_unrefp) sd_bus *bus = NULL; int r; assert(_bus); if (geteuid() != 0) return sd_bus_default_system(_bus); /* If we are root and kdbus is not available, then let's talk * directly to the system instance, instead of going via the * bus */ r = sd_bus_new(&bus); if (r < 0) return r; r = sd_bus_set_address(bus, KERNEL_SYSTEM_BUS_ADDRESS); if (r < 0) return r; bus->bus_client = true; r = sd_bus_start(bus); if (r >= 0) { *_bus = bus; bus = NULL; return 0; } bus = sd_bus_unref(bus); r = sd_bus_new(&bus); if (r < 0) return r; r = sd_bus_set_address(bus, "unix:path=/run/systemd/private"); if (r < 0) return r; r = sd_bus_start(bus); if (r < 0) return sd_bus_default_system(_bus); r = bus_check_peercred(bus); if (r < 0) return r; *_bus = bus; bus = NULL; return 0; } int bus_connect_user_systemd(sd_bus **_bus) { _cleanup_(sd_bus_unrefp) sd_bus *bus = NULL; _cleanup_free_ char *ee = NULL; const char *e; int r; /* Try via kdbus first, and then directly */ assert(_bus); r = sd_bus_new(&bus); if (r < 0) return r; if (asprintf(&bus->address, KERNEL_USER_BUS_ADDRESS_FMT, getuid()) < 0) return -ENOMEM; bus->bus_client = true; r = sd_bus_start(bus); if (r >= 0) { *_bus = bus; bus = NULL; return 0; } bus = sd_bus_unref(bus); e = secure_getenv("XDG_RUNTIME_DIR"); if (!e) return sd_bus_default_user(_bus); ee = bus_address_escape(e); if (!ee) return -ENOMEM; r = sd_bus_new(&bus); if (r < 0) return r; bus->address = strjoin("unix:path=", ee, "/systemd/private", NULL); if (!bus->address) return -ENOMEM; r = sd_bus_start(bus); if (r < 0) return sd_bus_default_user(_bus); r = bus_check_peercred(bus); if (r < 0) return r; *_bus = bus; bus = NULL; return 0; } #define print_property(name, fmt, ...) \ do { \ if (value) \ printf(fmt "\n", __VA_ARGS__); \ else \ printf("%s=" fmt "\n", name, __VA_ARGS__); \ } while(0) int bus_print_property(const char *name, sd_bus_message *property, bool value, bool all) { char type; const char *contents; int r; assert(name); assert(property); r = sd_bus_message_peek_type(property, &type, &contents); if (r < 0) return r; switch (type) { case SD_BUS_TYPE_STRING: { const char *s; r = sd_bus_message_read_basic(property, type, &s); if (r < 0) return r; if (all || !isempty(s)) { _cleanup_free_ char *escaped = NULL; escaped = xescape(s, "\n"); if (!escaped) return -ENOMEM; print_property(name, "%s", escaped); } return 1; } case SD_BUS_TYPE_BOOLEAN: { int b; r = sd_bus_message_read_basic(property, type, &b); if (r < 0) return r; print_property(name, "%s", yes_no(b)); return 1; } case SD_BUS_TYPE_UINT64: { uint64_t u; r = sd_bus_message_read_basic(property, type, &u); if (r < 0) return r; /* Yes, heuristics! But we can change this check * should it turn out to not be sufficient */ if (endswith(name, "Timestamp")) { char timestamp[FORMAT_TIMESTAMP_MAX], *t; t = format_timestamp(timestamp, sizeof(timestamp), u); if (t || all) print_property(name, "%s", strempty(t)); } else if (strstr(name, "USec")) { char timespan[FORMAT_TIMESPAN_MAX]; print_property(name, "%s", format_timespan(timespan, sizeof(timespan), u, 0)); } else print_property(name, "%"PRIu64, u); return 1; } case SD_BUS_TYPE_INT64: { int64_t i; r = sd_bus_message_read_basic(property, type, &i); if (r < 0) return r; print_property(name, "%"PRIi64, i); return 1; } case SD_BUS_TYPE_UINT32: { uint32_t u; r = sd_bus_message_read_basic(property, type, &u); if (r < 0) return r; if (strstr(name, "UMask") || strstr(name, "Mode")) print_property(name, "%04o", u); else print_property(name, "%"PRIu32, u); return 1; } case SD_BUS_TYPE_INT32: { int32_t i; r = sd_bus_message_read_basic(property, type, &i); if (r < 0) return r; print_property(name, "%"PRIi32, i); return 1; } case SD_BUS_TYPE_DOUBLE: { double d; r = sd_bus_message_read_basic(property, type, &d); if (r < 0) return r; print_property(name, "%g", d); return 1; } case SD_BUS_TYPE_ARRAY: if (streq(contents, "s")) { bool first = true; const char *str; r = sd_bus_message_enter_container(property, SD_BUS_TYPE_ARRAY, contents); if (r < 0) return r; while ((r = sd_bus_message_read_basic(property, SD_BUS_TYPE_STRING, &str)) > 0) { _cleanup_free_ char *escaped = NULL; if (first && !value) printf("%s=", name); escaped = xescape(str, "\n "); if (!escaped) return -ENOMEM; printf("%s%s", first ? "" : " ", escaped); first = false; } if (r < 0) return r; if (first && all && !value) printf("%s=", name); if (!first || all) puts(""); r = sd_bus_message_exit_container(property); if (r < 0) return r; return 1; } else if (streq(contents, "y")) { const uint8_t *u; size_t n; r = sd_bus_message_read_array(property, SD_BUS_TYPE_BYTE, (const void**) &u, &n); if (r < 0) return r; if (all || n > 0) { unsigned int i; if (!value) printf("%s=", name); for (i = 0; i < n; i++) printf("%02x", u[i]); puts(""); } return 1; } else if (streq(contents, "u")) { uint32_t *u; size_t n; r = sd_bus_message_read_array(property, SD_BUS_TYPE_UINT32, (const void**) &u, &n); if (r < 0) return r; if (all || n > 0) { unsigned int i; if (!value) printf("%s=", name); for (i = 0; i < n; i++) printf("%08x", u[i]); puts(""); } return 1; } break; } return 0; } int bus_print_all_properties(sd_bus *bus, const char *dest, const char *path, char **filter, bool value, bool all) { _cleanup_(sd_bus_message_unrefp) sd_bus_message *reply = NULL; _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL; int r; assert(bus); assert(path); r = sd_bus_call_method(bus, dest, path, "org.freedesktop.DBus.Properties", "GetAll", &error, &reply, "s", ""); if (r < 0) return r; r = sd_bus_message_enter_container(reply, SD_BUS_TYPE_ARRAY, "{sv}"); if (r < 0) return r; while ((r = sd_bus_message_enter_container(reply, SD_BUS_TYPE_DICT_ENTRY, "sv")) > 0) { const char *name; const char *contents; r = sd_bus_message_read_basic(reply, SD_BUS_TYPE_STRING, &name); if (r < 0) return r; if (!filter || strv_find(filter, name)) { r = sd_bus_message_peek_type(reply, NULL, &contents); if (r < 0) return r; r = sd_bus_message_enter_container(reply, SD_BUS_TYPE_VARIANT, contents); if (r < 0) return r; r = bus_print_property(name, reply, value, all); if (r < 0) return r; if (r == 0) { if (all) printf("%s=[unprintable]\n", name); /* skip what we didn't read */ r = sd_bus_message_skip(reply, contents); if (r < 0) return r; } r = sd_bus_message_exit_container(reply); if (r < 0) return r; } else { r = sd_bus_message_skip(reply, "v"); if (r < 0) return r; } r = sd_bus_message_exit_container(reply); if (r < 0) return r; } if (r < 0) return r; r = sd_bus_message_exit_container(reply); if (r < 0) return r; return 0; } int bus_map_id128(sd_bus *bus, const char *member, sd_bus_message *m, sd_bus_error *error, void *userdata) { sd_id128_t *p = userdata; const void *v; size_t n; int r; r = sd_bus_message_read_array(m, SD_BUS_TYPE_BYTE, &v, &n); if (r < 0) return r; if (n == 0) *p = SD_ID128_NULL; else if (n == 16) memcpy((*p).bytes, v, n); else return -EINVAL; return 0; } static int map_basic(sd_bus *bus, const char *member, sd_bus_message *m, sd_bus_error *error, void *userdata) { char type; int r; r = sd_bus_message_peek_type(m, &type, NULL); if (r < 0) return r; switch (type) { case SD_BUS_TYPE_STRING: { const char *s; char **p = userdata; r = sd_bus_message_read_basic(m, type, &s); if (r < 0) break; if (isempty(s)) break; r = free_and_strdup(p, s); break; } case SD_BUS_TYPE_ARRAY: { _cleanup_strv_free_ char **l = NULL; char ***p = userdata; r = bus_message_read_strv_extend(m, &l); if (r < 0) break; strv_free(*p); *p = l; l = NULL; break; } case SD_BUS_TYPE_BOOLEAN: { unsigned b; bool *p = userdata; r = sd_bus_message_read_basic(m, type, &b); if (r < 0) break; *p = b; break; } case SD_BUS_TYPE_UINT32: { uint32_t u; uint32_t *p = userdata; r = sd_bus_message_read_basic(m, type, &u); if (r < 0) break; *p = u; break; } case SD_BUS_TYPE_UINT64: { uint64_t t; uint64_t *p = userdata; r = sd_bus_message_read_basic(m, type, &t); if (r < 0) break; *p = t; break; } default: break; } return r; } int bus_message_map_all_properties( sd_bus_message *m, const struct bus_properties_map *map, void *userdata) { _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL; int r; assert(m); assert(map); r = sd_bus_message_enter_container(m, SD_BUS_TYPE_ARRAY, "{sv}"); if (r < 0) return r; while ((r = sd_bus_message_enter_container(m, SD_BUS_TYPE_DICT_ENTRY, "sv")) > 0) { const struct bus_properties_map *prop; const char *member; const char *contents; void *v; unsigned i; r = sd_bus_message_read_basic(m, SD_BUS_TYPE_STRING, &member); if (r < 0) return r; for (i = 0, prop = NULL; map[i].member; i++) if (streq(map[i].member, member)) { prop = &map[i]; break; } if (prop) { r = sd_bus_message_peek_type(m, NULL, &contents); if (r < 0) return r; r = sd_bus_message_enter_container(m, SD_BUS_TYPE_VARIANT, contents); if (r < 0) return r; v = (uint8_t *)userdata + prop->offset; if (map[i].set) r = prop->set(sd_bus_message_get_bus(m), member, m, &error, v); else r = map_basic(sd_bus_message_get_bus(m), member, m, &error, v); if (r < 0) return r; r = sd_bus_message_exit_container(m); if (r < 0) return r; } else { r = sd_bus_message_skip(m, "v"); if (r < 0) return r; } r = sd_bus_message_exit_container(m); if (r < 0) return r; } if (r < 0) return r; return sd_bus_message_exit_container(m); } int bus_message_map_properties_changed( sd_bus_message *m, const struct bus_properties_map *map, void *userdata) { const char *member; int r, invalidated, i; assert(m); assert(map); r = bus_message_map_all_properties(m, map, userdata); if (r < 0) return r; r = sd_bus_message_enter_container(m, SD_BUS_TYPE_ARRAY, "s"); if (r < 0) return r; invalidated = 0; while ((r = sd_bus_message_read_basic(m, SD_BUS_TYPE_STRING, &member)) > 0) for (i = 0; map[i].member; i++) if (streq(map[i].member, member)) { ++invalidated; break; } if (r < 0) return r; r = sd_bus_message_exit_container(m); if (r < 0) return r; return invalidated; } int bus_map_all_properties( sd_bus *bus, const char *destination, const char *path, const struct bus_properties_map *map, void *userdata) { _cleanup_(sd_bus_message_unrefp) sd_bus_message *m = NULL; _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL; int r; assert(bus); assert(destination); assert(path); assert(map); r = sd_bus_call_method( bus, destination, path, "org.freedesktop.DBus.Properties", "GetAll", &error, &m, "s", ""); if (r < 0) return r; return bus_message_map_all_properties(m, map, userdata); } int bus_connect_transport(BusTransport transport, const char *host, bool user, sd_bus **bus) { int r; assert(transport >= 0); assert(transport < _BUS_TRANSPORT_MAX); assert(bus); assert_return((transport == BUS_TRANSPORT_LOCAL) == !host, -EINVAL); assert_return(transport == BUS_TRANSPORT_LOCAL || !user, -EOPNOTSUPP); switch (transport) { case BUS_TRANSPORT_LOCAL: if (user) r = sd_bus_default_user(bus); else r = sd_bus_default_system(bus); break; case BUS_TRANSPORT_REMOTE: r = sd_bus_open_system_remote(bus, host); break; case BUS_TRANSPORT_MACHINE: r = sd_bus_open_system_machine(bus, host); break; default: assert_not_reached("Hmm, unknown transport type."); } return r; } int bus_connect_transport_systemd(BusTransport transport, const char *host, bool user, sd_bus **bus) { int r; assert(transport >= 0); assert(transport < _BUS_TRANSPORT_MAX); assert(bus); assert_return((transport == BUS_TRANSPORT_LOCAL) == !host, -EINVAL); assert_return(transport == BUS_TRANSPORT_LOCAL || !user, -EOPNOTSUPP); switch (transport) { case BUS_TRANSPORT_LOCAL: if (user) r = bus_connect_user_systemd(bus); else r = bus_connect_system_systemd(bus); break; case BUS_TRANSPORT_REMOTE: r = sd_bus_open_system_remote(bus, host); break; case BUS_TRANSPORT_MACHINE: r = sd_bus_open_system_machine(bus, host); break; default: assert_not_reached("Hmm, unknown transport type."); } return r; } int bus_property_get_bool( sd_bus *bus, const char *path, const char *interface, const char *property, sd_bus_message *reply, void *userdata, sd_bus_error *error) { int b = *(bool*) userdata; return sd_bus_message_append_basic(reply, 'b', &b); } #if __SIZEOF_SIZE_T__ != 8 int bus_property_get_size( sd_bus *bus, const char *path, const char *interface, const char *property, sd_bus_message *reply, void *userdata, sd_bus_error *error) { uint64_t sz = *(size_t*) userdata; return sd_bus_message_append_basic(reply, 't', &sz); } #endif #if __SIZEOF_LONG__ != 8 int bus_property_get_long( sd_bus *bus, const char *path, const char *interface, const char *property, sd_bus_message *reply, void *userdata, sd_bus_error *error) { int64_t l = *(long*) userdata; return sd_bus_message_append_basic(reply, 'x', &l); } int bus_property_get_ulong( sd_bus *bus, const char *path, const char *interface, const char *property, sd_bus_message *reply, void *userdata, sd_bus_error *error) { uint64_t ul = *(unsigned long*) userdata; return sd_bus_message_append_basic(reply, 't', &ul); } #endif int bus_log_parse_error(int r) { return log_error_errno(r, "Failed to parse bus message: %m"); } int bus_log_create_error(int r) { return log_error_errno(r, "Failed to create bus message: %m"); } int bus_parse_unit_info(sd_bus_message *message, UnitInfo *u) { assert(message); assert(u); u->machine = NULL; return sd_bus_message_read( message, "(ssssssouso)", &u->id, &u->description, &u->load_state, &u->active_state, &u->sub_state, &u->following, &u->unit_path, &u->job_id, &u->job_type, &u->job_path); } int bus_append_unit_property_assignment(sd_bus_message *m, const char *assignment) { const char *eq, *field; int r, rl; assert(m); assert(assignment); eq = strchr(assignment, '='); if (!eq) { log_error("Not an assignment: %s", assignment); return -EINVAL; } r = sd_bus_message_open_container(m, SD_BUS_TYPE_STRUCT, "sv"); if (r < 0) return bus_log_create_error(r); field = strndupa(assignment, eq - assignment); eq++; if (streq(field, "CPUQuota")) { if (isempty(eq)) r = sd_bus_message_append(m, "sv", "CPUQuotaPerSecUSec", "t", USEC_INFINITY); else if (endswith(eq, "%")) { double percent; if (sscanf(eq, "%lf%%", &percent) != 1 || percent <= 0) { log_error("CPU quota '%s' invalid.", eq); return -EINVAL; } r = sd_bus_message_append(m, "sv", "CPUQuotaPerSecUSec", "t", (usec_t) percent * USEC_PER_SEC / 100); } else { log_error("CPU quota needs to be in percent."); return -EINVAL; } goto finish; } else if (streq(field, "EnvironmentFile")) { r = sd_bus_message_append(m, "sv", "EnvironmentFiles", "a(sb)", 1, eq[0] == '-' ? eq + 1 : eq, eq[0] == '-'); goto finish; } else if (STR_IN_SET(field, "AccuracySec", "RandomizedDelaySec", "RuntimeMaxSec")) { char *n; usec_t t; size_t l; r = parse_sec(eq, &t); if (r < 0) return log_error_errno(r, "Failed to parse %s= parameter: %s", field, eq); l = strlen(field); n = newa(char, l + 2); if (!n) return log_oom(); /* Change suffix Sec → USec */ strcpy(mempcpy(n, field, l - 3), "USec"); r = sd_bus_message_append(m, "sv", n, "t", t); goto finish; } r = sd_bus_message_append_basic(m, SD_BUS_TYPE_STRING, field); if (r < 0) return bus_log_create_error(r); rl = rlimit_from_string(field); if (rl >= 0) { const char *sn; struct rlimit l; r = rlimit_parse(rl, eq, &l); if (r < 0) return log_error_errno(r, "Failed to parse resource limit: %s", eq); r = sd_bus_message_append(m, "v", "t", l.rlim_max); if (r < 0) return bus_log_create_error(r); r = sd_bus_message_close_container(m); if (r < 0) return bus_log_create_error(r); r = sd_bus_message_open_container(m, SD_BUS_TYPE_STRUCT, "sv"); if (r < 0) return bus_log_create_error(r); sn = strjoina(field, "Soft"); r = sd_bus_message_append(m, "sv", sn, "t", l.rlim_cur); } else if (STR_IN_SET(field, "CPUAccounting", "MemoryAccounting", "BlockIOAccounting", "TasksAccounting", "SendSIGHUP", "SendSIGKILL", "WakeSystem", "DefaultDependencies", "IgnoreSIGPIPE", "TTYVHangup", "TTYReset", "RemainAfterExit", "PrivateTmp", "PrivateDevices", "PrivateNetwork", "NoNewPrivileges", "SyslogLevelPrefix", "Delegate", "RemainAfterElapse")) { r = parse_boolean(eq); if (r < 0) return log_error_errno(r, "Failed to parse boolean assignment %s.", assignment); r = sd_bus_message_append(m, "v", "b", r); } else if (streq(field, "MemoryLimit")) { uint64_t bytes; if (isempty(eq) || streq(eq, "infinity")) bytes = (uint64_t) -1; else { r = parse_size(eq, 1024, &bytes); if (r < 0) { log_error("Failed to parse bytes specification %s", assignment); return -EINVAL; } } r = sd_bus_message_append(m, "v", "t", bytes); } else if (streq(field, "TasksMax")) { uint64_t n; if (isempty(eq) || streq(eq, "infinity")) n = (uint64_t) -1; else { r = safe_atou64(eq, &n); if (r < 0) { log_error("Failed to parse maximum tasks specification %s", assignment); return -EINVAL; } } r = sd_bus_message_append(m, "v", "t", n); } else if (STR_IN_SET(field, "CPUShares", "StartupCPUShares")) { uint64_t u; r = cg_cpu_shares_parse(eq, &u); if (r < 0) { log_error("Failed to parse %s value %s.", field, eq); return -EINVAL; } r = sd_bus_message_append(m, "v", "t", u); } else if (STR_IN_SET(field, "BlockIOWeight", "StartupBlockIOWeight")) { uint64_t u; r = cg_cpu_shares_parse(eq, &u); if (r < 0) { log_error("Failed to parse %s value %s.", field, eq); return -EINVAL; } r = sd_bus_message_append(m, "v", "t", u); } else if (STR_IN_SET(field, "User", "Group", "DevicePolicy", "KillMode", "UtmpIdentifier", "UtmpMode", "PAMName", "TTYPath", "StandardInput", "StandardOutput", "StandardError", "Description", "Slice", "Type", "WorkingDirectory", "RootDirectory", "SyslogIdentifier", "ProtectSystem", "ProtectHome")) r = sd_bus_message_append(m, "v", "s", eq); else if (streq(field, "SyslogLevel")) { int level; level = log_level_from_string(eq); if (level < 0) { log_error("Failed to parse %s value %s.", field, eq); return -EINVAL; } r = sd_bus_message_append(m, "v", "i", level); } else if (streq(field, "SyslogFacility")) { int facility; facility = log_facility_unshifted_from_string(eq); if (facility < 0) { log_error("Failed to parse %s value %s.", field, eq); return -EINVAL; } r = sd_bus_message_append(m, "v", "i", facility); } else if (streq(field, "DeviceAllow")) { if (isempty(eq)) r = sd_bus_message_append(m, "v", "a(ss)", 0); else { const char *path, *rwm, *e; e = strchr(eq, ' '); if (e) { path = strndupa(eq, e - eq); rwm = e+1; } else { path = eq; rwm = ""; } if (!path_startswith(path, "/dev")) { log_error("%s is not a device file in /dev.", path); return -EINVAL; } r = sd_bus_message_append(m, "v", "a(ss)", 1, path, rwm); } } else if (STR_IN_SET(field, "BlockIOReadBandwidth", "BlockIOWriteBandwidth")) { if (isempty(eq)) r = sd_bus_message_append(m, "v", "a(st)", 0); else { const char *path, *bandwidth, *e; uint64_t bytes; e = strchr(eq, ' '); if (e) { path = strndupa(eq, e - eq); bandwidth = e+1; } else { log_error("Failed to parse %s value %s.", field, eq); return -EINVAL; } if (!path_startswith(path, "/dev")) { log_error("%s is not a device file in /dev.", path); return -EINVAL; } r = parse_size(bandwidth, 1000, &bytes); if (r < 0) { log_error("Failed to parse byte value %s.", bandwidth); return -EINVAL; } r = sd_bus_message_append(m, "v", "a(st)", 1, path, bytes); } } else if (streq(field, "BlockIODeviceWeight")) { if (isempty(eq)) r = sd_bus_message_append(m, "v", "a(st)", 0); else { const char *path, *weight, *e; uint64_t u; e = strchr(eq, ' '); if (e) { path = strndupa(eq, e - eq); weight = e+1; } else { log_error("Failed to parse %s value %s.", field, eq); return -EINVAL; } if (!path_startswith(path, "/dev")) { log_error("%s is not a device file in /dev.", path); return -EINVAL; } r = safe_atou64(weight, &u); if (r < 0) { log_error("Failed to parse %s value %s.", field, weight); return -EINVAL; } r = sd_bus_message_append(m, "v", "a(st)", path, u); } } else if (streq(field, "Nice")) { int32_t i; r = safe_atoi32(eq, &i); if (r < 0) { log_error("Failed to parse %s value %s.", field, eq); return -EINVAL; } r = sd_bus_message_append(m, "v", "i", i); } else if (STR_IN_SET(field, "Environment", "PassEnvironment")) { const char *p; r = sd_bus_message_open_container(m, 'v', "as"); if (r < 0) return bus_log_create_error(r); r = sd_bus_message_open_container(m, 'a', "s"); if (r < 0) return bus_log_create_error(r); p = eq; for (;;) { _cleanup_free_ char *word = NULL; r = extract_first_word(&p, &word, NULL, EXTRACT_QUOTES|EXTRACT_CUNESCAPE); if (r < 0) { log_error("Failed to parse Environment value %s", eq); return -EINVAL; } if (r == 0) break; if (streq(field, "Environment")) { if (!env_assignment_is_valid(word)) { log_error("Invalid environment assignment: %s", word); return -EINVAL; } } else { /* PassEnvironment */ if (!env_name_is_valid(word)) { log_error("Invalid environment variable name: %s", word); return -EINVAL; } } r = sd_bus_message_append_basic(m, 's', word); if (r < 0) return bus_log_create_error(r); } r = sd_bus_message_close_container(m); if (r < 0) return bus_log_create_error(r); r = sd_bus_message_close_container(m); } else if (streq(field, "KillSignal")) { int sig; sig = signal_from_string_try_harder(eq); if (sig < 0) { log_error("Failed to parse %s value %s.", field, eq); return -EINVAL; } r = sd_bus_message_append(m, "v", "i", sig); } else if (streq(field, "TimerSlackNSec")) { nsec_t n; r = parse_nsec(eq, &n); if (r < 0) { log_error("Failed to parse %s value %s", field, eq); return -EINVAL; } r = sd_bus_message_append(m, "v", "t", n); } else if (streq(field, "OOMScoreAdjust")) { int oa; r = safe_atoi(eq, &oa); if (r < 0) { log_error("Failed to parse %s value %s", field, eq); return -EINVAL; } if (!oom_score_adjust_is_valid(oa)) { log_error("OOM score adjust value out of range"); return -EINVAL; } r = sd_bus_message_append(m, "v", "i", oa); } else if (STR_IN_SET(field, "ReadWriteDirectories", "ReadOnlyDirectories", "InaccessibleDirectories")) { const char *p; r = sd_bus_message_open_container(m, 'v', "as"); if (r < 0) return bus_log_create_error(r); r = sd_bus_message_open_container(m, 'a', "s"); if (r < 0) return bus_log_create_error(r); p = eq; for (;;) { _cleanup_free_ char *word = NULL; int offset; r = extract_first_word(&p, &word, NULL, EXTRACT_QUOTES); if (r < 0) { log_error("Failed to parse %s value %s", field, eq); return -EINVAL; } if (r == 0) break; if (!utf8_is_valid(word)) { log_error("Failed to parse %s value %s", field, eq); return -EINVAL; } offset = word[0] == '-'; if (!path_is_absolute(word + offset)) { log_error("Failed to parse %s value %s", field, eq); return -EINVAL; } path_kill_slashes(word + offset); r = sd_bus_message_append_basic(m, 's', word); if (r < 0) return bus_log_create_error(r); } r = sd_bus_message_close_container(m); if (r < 0) return bus_log_create_error(r); r = sd_bus_message_close_container(m); } else if (streq(field, "RuntimeDirectory")) { const char *p; r = sd_bus_message_open_container(m, 'v', "as"); if (r < 0) return bus_log_create_error(r); r = sd_bus_message_open_container(m, 'a', "s"); if (r < 0) return bus_log_create_error(r); p = eq; for (;;) { _cleanup_free_ char *word = NULL; r = extract_first_word(&p, &word, NULL, EXTRACT_QUOTES); if (r < 0) return log_error_errno(r, "Failed to parse %s value %s", field, eq); if (r == 0) break; r = sd_bus_message_append_basic(m, 's', word); if (r < 0) return bus_log_create_error(r); } r = sd_bus_message_close_container(m); if (r < 0) return bus_log_create_error(r); r = sd_bus_message_close_container(m); } else { log_error("Unknown assignment %s.", assignment); return -EINVAL; } finish: if (r < 0) return bus_log_create_error(r); r = sd_bus_message_close_container(m); if (r < 0) return bus_log_create_error(r); return 0; } typedef struct BusWaitForJobs { sd_bus *bus; Set *jobs; char *name; char *result; sd_bus_slot *slot_job_removed; sd_bus_slot *slot_disconnected; } BusWaitForJobs; static int match_disconnected(sd_bus_message *m, void *userdata, sd_bus_error *error) { assert(m); log_error("Warning! D-Bus connection terminated."); sd_bus_close(sd_bus_message_get_bus(m)); return 0; } static int match_job_removed(sd_bus_message *m, void *userdata, sd_bus_error *error) { const char *path, *unit, *result; BusWaitForJobs *d = userdata; uint32_t id; char *found; int r; assert(m); assert(d); r = sd_bus_message_read(m, "uoss", &id, &path, &unit, &result); if (r < 0) { bus_log_parse_error(r); return 0; } found = set_remove(d->jobs, (char*) path); if (!found) return 0; free(found); if (!isempty(result)) d->result = strdup(result); if (!isempty(unit)) d->name = strdup(unit); return 0; } void bus_wait_for_jobs_free(BusWaitForJobs *d) { if (!d) return; set_free_free(d->jobs); sd_bus_slot_unref(d->slot_disconnected); sd_bus_slot_unref(d->slot_job_removed); sd_bus_unref(d->bus); free(d->name); free(d->result); free(d); } int bus_wait_for_jobs_new(sd_bus *bus, BusWaitForJobs **ret) { _cleanup_(bus_wait_for_jobs_freep) BusWaitForJobs *d = NULL; int r; assert(bus); assert(ret); d = new0(BusWaitForJobs, 1); if (!d) return -ENOMEM; d->bus = sd_bus_ref(bus); /* When we are a bus client we match by sender. Direct * connections OTOH have no initialized sender field, and * hence we ignore the sender then */ r = sd_bus_add_match( bus, &d->slot_job_removed, bus->bus_client ? "type='signal'," "sender='org.freedesktop.systemd1'," "interface='org.freedesktop.systemd1.Manager'," "member='JobRemoved'," "path='/org/freedesktop/systemd1'" : "type='signal'," "interface='org.freedesktop.systemd1.Manager'," "member='JobRemoved'," "path='/org/freedesktop/systemd1'", match_job_removed, d); if (r < 0) return r; r = sd_bus_add_match( bus, &d->slot_disconnected, "type='signal'," "sender='org.freedesktop.DBus.Local'," "interface='org.freedesktop.DBus.Local'," "member='Disconnected'", match_disconnected, d); if (r < 0) return r; *ret = d; d = NULL; return 0; } static int bus_process_wait(sd_bus *bus) { int r; for (;;) { r = sd_bus_process(bus, NULL); if (r < 0) return r; if (r > 0) return 0; r = sd_bus_wait(bus, (uint64_t) -1); if (r < 0) return r; } } static int bus_job_get_service_result(BusWaitForJobs *d, char **result) { _cleanup_free_ char *dbus_path = NULL; assert(d); assert(d->name); assert(result); dbus_path = unit_dbus_path_from_name(d->name); if (!dbus_path) return -ENOMEM; return sd_bus_get_property_string(d->bus, "org.freedesktop.systemd1", dbus_path, "org.freedesktop.systemd1.Service", "Result", NULL, result); } static const struct { const char *result, *explanation; } explanations [] = { { "resources", "a configured resource limit was exceeded" }, { "timeout", "a timeout was exceeded" }, { "exit-code", "the control process exited with error code" }, { "signal", "a fatal signal was delivered to the control process" }, { "core-dump", "a fatal signal was delivered causing the control process to dump core" }, { "watchdog", "the service failed to send watchdog ping" }, { "start-limit", "start of the service was attempted too often" } }; static void log_job_error_with_service_result(const char* service, const char *result, const char* const* extra_args) { _cleanup_free_ char *service_shell_quoted = NULL; const char *systemctl = "systemctl", *journalctl = "journalctl"; assert(service); service_shell_quoted = shell_maybe_quote(service); if (extra_args && extra_args[1]) { _cleanup_free_ char *t; t = strv_join((char**) extra_args, " "); systemctl = strjoina("systemctl ", t ? : ""); journalctl = strjoina("journalctl ", t ? : ""); } if (!isempty(result)) { unsigned i; for (i = 0; i < ELEMENTSOF(explanations); ++i) if (streq(result, explanations[i].result)) break; if (i < ELEMENTSOF(explanations)) { log_error("Job for %s failed because %s.\n" "See \"%s status %s\" and \"%s -xe\" for details.\n", service, explanations[i].explanation, systemctl, service_shell_quoted ?: "", journalctl); goto finish; } } log_error("Job for %s failed.\n" "See \"%s status %s\" and \"%s -xe\" for details.\n", service, systemctl, service_shell_quoted ?: "", journalctl); finish: /* For some results maybe additional explanation is required */ if (streq_ptr(result, "start-limit")) log_info("To force a start use \"%1$s reset-failed %2$s\"\n" "followed by \"%1$s start %2$s\" again.", systemctl, service_shell_quoted ?: ""); } static int check_wait_response(BusWaitForJobs *d, bool quiet, const char* const* extra_args) { int r = 0; assert(d->result); if (!quiet) { if (streq(d->result, "canceled")) log_error("Job for %s canceled.", strna(d->name)); else if (streq(d->result, "timeout")) log_error("Job for %s timed out.", strna(d->name)); else if (streq(d->result, "dependency")) log_error("A dependency job for %s failed. See 'journalctl -xe' for details.", strna(d->name)); else if (streq(d->result, "invalid")) log_error("%s is not active, cannot reload.", strna(d->name)); else if (streq(d->result, "assert")) log_error("Assertion failed on job for %s.", strna(d->name)); else if (streq(d->result, "unsupported")) log_error("Operation on or unit type of %s not supported on this system.", strna(d->name)); else if (!streq(d->result, "done") && !streq(d->result, "skipped")) { if (d->name) { int q; _cleanup_free_ char *result = NULL; q = bus_job_get_service_result(d, &result); if (q < 0) log_debug_errno(q, "Failed to get Result property of service %s: %m", d->name); log_job_error_with_service_result(d->name, result, extra_args); } else log_error("Job failed. See \"journalctl -xe\" for details."); } } if (streq(d->result, "canceled")) r = -ECANCELED; else if (streq(d->result, "timeout")) r = -ETIME; else if (streq(d->result, "dependency")) r = -EIO; else if (streq(d->result, "invalid")) r = -ENOEXEC; else if (streq(d->result, "assert")) r = -EPROTO; else if (streq(d->result, "unsupported")) r = -EOPNOTSUPP; else if (!streq(d->result, "done") && !streq(d->result, "skipped")) r = -EIO; return r; } int bus_wait_for_jobs(BusWaitForJobs *d, bool quiet, const char* const* extra_args) { int r = 0; assert(d); while (!set_isempty(d->jobs)) { int q; q = bus_process_wait(d->bus); if (q < 0) return log_error_errno(q, "Failed to wait for response: %m"); if (d->result) { q = check_wait_response(d, quiet, extra_args); /* Return the first error as it is most likely to be * meaningful. */ if (q < 0 && r == 0) r = q; log_debug_errno(q, "Got result %s/%m for job %s", strna(d->result), strna(d->name)); } d->name = mfree(d->name); d->result = mfree(d->result); } return r; } int bus_wait_for_jobs_add(BusWaitForJobs *d, const char *path) { int r; assert(d); r = set_ensure_allocated(&d->jobs, &string_hash_ops); if (r < 0) return r; return set_put_strdup(d->jobs, path); } int bus_wait_for_jobs_one(BusWaitForJobs *d, const char *path, bool quiet) { int r; r = bus_wait_for_jobs_add(d, path); if (r < 0) return log_oom(); return bus_wait_for_jobs(d, quiet, NULL); } int bus_deserialize_and_dump_unit_file_changes(sd_bus_message *m, bool quiet, UnitFileChange **changes, unsigned *n_changes) { const char *type, *path, *source; int r; r = sd_bus_message_enter_container(m, SD_BUS_TYPE_ARRAY, "(sss)"); if (r < 0) return bus_log_parse_error(r); while ((r = sd_bus_message_read(m, "(sss)", &type, &path, &source)) > 0) { if (!quiet) { if (streq(type, "symlink")) log_info("Created symlink from %s to %s.", path, source); else log_info("Removed symlink %s.", path); } r = unit_file_changes_add(changes, n_changes, streq(type, "symlink") ? UNIT_FILE_SYMLINK : UNIT_FILE_UNLINK, path, source); if (r < 0) return r; } if (r < 0) return bus_log_parse_error(r); r = sd_bus_message_exit_container(m); if (r < 0) return bus_log_parse_error(r); return 0; } /** * bus_path_encode_unique() - encode unique object path * @b: bus connection or NULL * @prefix: object path prefix * @sender_id: unique-name of client, or NULL * @external_id: external ID to be chosen by client, or NULL * @ret_path: storage for encoded object path pointer * * Whenever we provide a bus API that allows clients to create and manage * server-side objects, we need to provide a unique name for these objects. If * we let the server choose the name, we suffer from a race condition: If a * client creates an object asynchronously, it cannot destroy that object until * it received the method reply. It cannot know the name of the new object, * thus, it cannot destroy it. Furthermore, it enforces a round-trip. * * Therefore, many APIs allow the client to choose the unique name for newly * created objects. There're two problems to solve, though: * 1) Object names are usually defined via dbus object paths, which are * usually globally namespaced. Therefore, multiple clients must be able * to choose unique object names without interference. * 2) If multiple libraries share the same bus connection, they must be * able to choose unique object names without interference. * The first problem is solved easily by prefixing a name with the * unique-bus-name of a connection. The server side must enforce this and * reject any other name. The second problem is solved by providing unique * suffixes from within sd-bus. * * This helper allows clients to create unique object-paths. It uses the * template '/prefix/sender_id/external_id' and returns the new path in * @ret_path (must be freed by the caller). * If @sender_id is NULL, the unique-name of @b is used. If @external_id is * NULL, this function allocates a unique suffix via @b (by requesting a new * cookie). If both @sender_id and @external_id are given, @b can be passed as * NULL. * * Returns: 0 on success, negative error code on failure. */ int bus_path_encode_unique(sd_bus *b, const char *prefix, const char *sender_id, const char *external_id, char **ret_path) { _cleanup_free_ char *sender_label = NULL, *external_label = NULL; char external_buf[DECIMAL_STR_MAX(uint64_t)], *p; int r; assert_return(b || (sender_id && external_id), -EINVAL); assert_return(object_path_is_valid(prefix), -EINVAL); assert_return(ret_path, -EINVAL); if (!sender_id) { r = sd_bus_get_unique_name(b, &sender_id); if (r < 0) return r; } if (!external_id) { xsprintf(external_buf, "%"PRIu64, ++b->cookie); external_id = external_buf; } sender_label = bus_label_escape(sender_id); if (!sender_label) return -ENOMEM; external_label = bus_label_escape(external_id); if (!external_label) return -ENOMEM; p = strjoin(prefix, "/", sender_label, "/", external_label, NULL); if (!p) return -ENOMEM; *ret_path = p; return 0; } /** * bus_path_decode_unique() - decode unique object path * @path: object path to decode * @prefix: object path prefix * @ret_sender: output parameter for sender-id label * @ret_external: output parameter for external-id label * * This does the reverse of bus_path_encode_unique() (see its description for * details). Both trailing labels, sender-id and external-id, are unescaped and * returned in the given output parameters (the caller must free them). * * Note that this function returns 0 if the path does not match the template * (see bus_path_encode_unique()), 1 if it matched. * * Returns: Negative error code on failure, 0 if the given object path does not * match the template (return parameters are set to NULL), 1 if it was * parsed successfully (return parameters contain allocated labels). */ int bus_path_decode_unique(const char *path, const char *prefix, char **ret_sender, char **ret_external) { const char *p, *q; char *sender, *external; assert(object_path_is_valid(path)); assert(object_path_is_valid(prefix)); assert(ret_sender); assert(ret_external); p = object_path_startswith(path, prefix); if (!p) { *ret_sender = NULL; *ret_external = NULL; return 0; } q = strchr(p, '/'); if (!q) { *ret_sender = NULL; *ret_external = NULL; return 0; } sender = bus_label_unescape_n(p, q - p); external = bus_label_unescape(q + 1); if (!sender || !external) { free(sender); free(external); return -ENOMEM; } *ret_sender = sender; *ret_external = external; return 1; } bool is_kdbus_wanted(void) { _cleanup_free_ char *value = NULL; #ifdef ENABLE_KDBUS const bool configured = true; #else const bool configured = false; #endif int r; if (get_proc_cmdline_key("kdbus", NULL) > 0) return true; r = get_proc_cmdline_key("kdbus=", &value); if (r <= 0) return configured; return parse_boolean(value) == 1; } bool is_kdbus_available(void) { _cleanup_close_ int fd = -1; struct kdbus_cmd cmd = { .size = sizeof(cmd), .flags = KDBUS_FLAG_NEGOTIATE }; if (!is_kdbus_wanted()) return false; fd = open("/sys/fs/kdbus/control", O_RDWR | O_CLOEXEC | O_NONBLOCK | O_NOCTTY); if (fd < 0) return false; return ioctl(fd, KDBUS_CMD_BUS_MAKE, &cmd) >= 0; } int bus_property_get_rlimit( sd_bus *bus, const char *path, const char *interface, const char *property, sd_bus_message *reply, void *userdata, sd_bus_error *error) { struct rlimit *rl; uint64_t u; rlim_t x; const char *is_soft; assert(bus); assert(reply); assert(userdata); is_soft = endswith(property, "Soft"); rl = *(struct rlimit**) userdata; if (rl) x = is_soft ? rl->rlim_cur : rl->rlim_max; else { struct rlimit buf = {}; int z; const char *s; s = is_soft ? strndupa(property, is_soft - property) : property; z = rlimit_from_string(strstr(s, "Limit")); assert(z >= 0); getrlimit(z, &buf); x = is_soft ? buf.rlim_cur : buf.rlim_max; } /* rlim_t might have different sizes, let's map * RLIMIT_INFINITY to (uint64_t) -1, so that it is the same on * all archs */ u = x == RLIM_INFINITY ? (uint64_t) -1 : (uint64_t) x; return sd_bus_message_append(reply, "t", u); }