/* SPDX-License-Identifier: LGPL-2.1+ */ #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 "cap-list.h" #include "cgroup-util.h" #include "def.h" #include "escape.h" #include "fd-util.h" #include "missing.h" #include "mountpoint-util.h" #include "nsflags.h" #include "parse-util.h" #include "path-util.h" #include "proc-cmdline.h" #include "rlimit-util.h" #include "stdio-util.h" #include "strv.h" #include "user-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) { const char *match; 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; match = strjoina( "sender='org.freedesktop.DBus'," "type='signal'," "interface='org.freedesktop.DBus'," "member='NameOwnerChanged'," "path='/org/freedesktop/DBus'," "arg0='", name, "',", "arg1='", unique, "',", "arg2=''"); r = sd_bus_add_match_async(bus, NULL, match, name_owner_change_callback, NULL, e); if (r < 0) return r; r = sd_bus_release_name_async(bus, NULL, name, NULL, NULL); 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; #if 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; } #if 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) { #if 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; #if 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; e = sd_bus_message_get_error(q->reply); /* Treat no PK available as access denied */ if (sd_bus_error_has_name(e, SD_BUS_ERROR_SERVICE_UNKNOWN)) return -EACCES; /* Copy error from polkit reply */ sd_bus_error_copy(error, e); 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; #if 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) { #if ENABLE_POLKIT hashmap_free_with_destructor(registry, async_polkit_query_free); #endif } int bus_check_peercred(sd_bus *c) { struct ucred ucred; int fd, r; assert(c); fd = sd_bus_get_fd(c); if (fd < 0) return fd; r = getpeercred(fd, &ucred); if (r < 0) return r; if (ucred.uid != 0 && ucred.uid != geteuid()) return -EPERM; return 1; } int bus_connect_system_systemd(sd_bus **_bus) { _cleanup_(sd_bus_close_unrefp) sd_bus *bus = NULL; int r; assert(_bus); if (geteuid() != 0) return sd_bus_default_system(_bus); /* If we are root 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, "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 = TAKE_PTR(bus); return 0; } int bus_connect_user_systemd(sd_bus **_bus) { _cleanup_(sd_bus_close_unrefp) sd_bus *bus = NULL; _cleanup_free_ char *ee = NULL; const char *e; int r; assert(_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"); 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 = TAKE_PTR(bus); return 0; } int bus_print_property_value(const char *name, const char *expected_value, bool only_value, const char *value) { assert(name); if (expected_value && !streq_ptr(expected_value, value)) return 0; if (only_value) puts(value); else printf("%s=%s\n", name, value); return 0; } int bus_print_property_valuef(const char *name, const char *expected_value, bool only_value, const char *fmt, ...) { va_list ap; int r; assert(name); assert(fmt); if (expected_value) { _cleanup_free_ char *s = NULL; va_start(ap, fmt); r = vasprintf(&s, fmt, ap); va_end(ap); if (r < 0) return -ENOMEM; if (streq_ptr(expected_value, s)) { if (only_value) puts(s); else printf("%s=%s\n", name, s); } return 0; } if (!only_value) printf("%s=", name); va_start(ap, fmt); vprintf(fmt, ap); va_end(ap); puts(""); return 0; } static int bus_print_property(const char *name, const char *expected_value, sd_bus_message *m, bool value, bool all) { char type; const char *contents; int r; assert(name); assert(m); r = sd_bus_message_peek_type(m, &type, &contents); if (r < 0) return r; switch (type) { case SD_BUS_TYPE_STRING: { const char *s; r = sd_bus_message_read_basic(m, type, &s); if (r < 0) return r; if (all || !isempty(s)) { bool good; /* This property has a single value, so we need to take * care not to print a new line, everything else is OK. */ good = !strchr(s, '\n'); bus_print_property_value(name, expected_value, value, good ? s : "[unprintable]"); } return 1; } case SD_BUS_TYPE_BOOLEAN: { int b; r = sd_bus_message_read_basic(m, type, &b); if (r < 0) return r; if (expected_value && parse_boolean(expected_value) != b) return 1; bus_print_property_value(name, NULL, value, yes_no(b)); return 1; } case SD_BUS_TYPE_UINT64: { uint64_t u; r = sd_bus_message_read_basic(m, 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") || STR_IN_SET(name, "NextElapseUSecRealtime", "LastTriggerUSec", "TimeUSec", "RTCTimeUSec")) { char timestamp[FORMAT_TIMESTAMP_MAX]; const char *t; t = format_timestamp(timestamp, sizeof(timestamp), u); if (t || all) bus_print_property_value(name, expected_value, value, strempty(t)); } else if (strstr(name, "USec")) { char timespan[FORMAT_TIMESPAN_MAX]; (void) format_timespan(timespan, sizeof(timespan), u, 0); bus_print_property_value(name, expected_value, value, timespan); } else if (streq(name, "RestrictNamespaces")) { _cleanup_free_ char *s = NULL; const char *result; if ((u & NAMESPACE_FLAGS_ALL) == 0) result = "yes"; else if (FLAGS_SET(u, NAMESPACE_FLAGS_ALL)) result = "no"; else { r = namespace_flags_to_string(u, &s); if (r < 0) return r; result = s; } bus_print_property_value(name, expected_value, value, result); } else if (streq(name, "MountFlags")) { const char *result; result = mount_propagation_flags_to_string(u); if (!result) return -EINVAL; bus_print_property_value(name, expected_value, value, result); } else if (STR_IN_SET(name, "CapabilityBoundingSet", "AmbientCapabilities")) { _cleanup_free_ char *s = NULL; r = capability_set_to_string_alloc(u, &s); if (r < 0) return r; bus_print_property_value(name, expected_value, value, s); } else if ((STR_IN_SET(name, "CPUWeight", "StartupCPUWeight", "IOWeight", "StartupIOWeight") && u == CGROUP_WEIGHT_INVALID) || (STR_IN_SET(name, "CPUShares", "StartupCPUShares") && u == CGROUP_CPU_SHARES_INVALID) || (STR_IN_SET(name, "BlockIOWeight", "StartupBlockIOWeight") && u == CGROUP_BLKIO_WEIGHT_INVALID) || (STR_IN_SET(name, "MemoryCurrent", "TasksCurrent") && u == (uint64_t) -1) || (endswith(name, "NSec") && u == (uint64_t) -1)) bus_print_property_value(name, expected_value, value, "[not set]"); else if ((STR_IN_SET(name, "DefaultMemoryLow", "DefaultMemoryMin", "MemoryLow", "MemoryHigh", "MemoryMax", "MemorySwapMax", "MemoryLimit") && u == CGROUP_LIMIT_MAX) || (STR_IN_SET(name, "TasksMax", "DefaultTasksMax") && u == (uint64_t) -1) || (startswith(name, "Limit") && u == (uint64_t) -1) || (startswith(name, "DefaultLimit") && u == (uint64_t) -1)) bus_print_property_value(name, expected_value, value, "infinity"); else if (STR_IN_SET(name, "IPIngressBytes", "IPIngressPackets", "IPEgressBytes", "IPEgressPackets") && u == (uint64_t) -1) bus_print_property_value(name, expected_value, value, "[no data]"); else bus_print_property_valuef(name, expected_value, value, "%"PRIu64, u); return 1; } case SD_BUS_TYPE_INT64: { int64_t i; r = sd_bus_message_read_basic(m, type, &i); if (r < 0) return r; bus_print_property_valuef(name, expected_value, value, "%"PRIi64, i); return 1; } case SD_BUS_TYPE_UINT32: { uint32_t u; r = sd_bus_message_read_basic(m, type, &u); if (r < 0) return r; if (strstr(name, "UMask") || strstr(name, "Mode")) bus_print_property_valuef(name, expected_value, value, "%04o", u); else if (streq(name, "UID")) { if (u == UID_INVALID) bus_print_property_value(name, expected_value, value, "[not set]"); else bus_print_property_valuef(name, expected_value, value, "%"PRIu32, u); } else if (streq(name, "GID")) { if (u == GID_INVALID) bus_print_property_value(name, expected_value, value, "[not set]"); else bus_print_property_valuef(name, expected_value, value, "%"PRIu32, u); } else bus_print_property_valuef(name, expected_value, value, "%"PRIu32, u); return 1; } case SD_BUS_TYPE_INT32: { int32_t i; r = sd_bus_message_read_basic(m, type, &i); if (r < 0) return r; bus_print_property_valuef(name, expected_value, value, "%"PRIi32, i); return 1; } case SD_BUS_TYPE_DOUBLE: { double d; r = sd_bus_message_read_basic(m, type, &d); if (r < 0) return r; bus_print_property_valuef(name, expected_value, value, "%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(m, SD_BUS_TYPE_ARRAY, contents); if (r < 0) return r; while ((r = sd_bus_message_read_basic(m, SD_BUS_TYPE_STRING, &str)) > 0) { bool good; if (first && !value) printf("%s=", name); /* This property has multiple space-separated values, so * neither spaces nor newlines can be allowed in a value. */ good = str[strcspn(str, " \n")] == '\0'; printf("%s%s", first ? "" : " ", good ? str : "[unprintable]"); first = false; } if (r < 0) return r; if (first && all && !value) printf("%s=", name); if (!first || all) puts(""); r = sd_bus_message_exit_container(m); 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(m, SD_BUS_TYPE_BYTE, (const void**) &u, &n); if (r < 0) return r; if (all || n > 0) { unsigned 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(m, SD_BUS_TYPE_UINT32, (const void**) &u, &n); if (r < 0) return r; if (all || n > 0) { unsigned i; if (!value) printf("%s=", name); for (i = 0; i < n; i++) printf("%08x", u[i]); puts(""); } return 1; } break; } return 0; } int bus_message_print_all_properties( sd_bus_message *m, bus_message_print_t func, char **filter, bool value, bool all, Set **found_properties) { int r; assert(m); 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) { _cleanup_free_ char *name_with_equal = NULL; const char *name, *contents, *expected_value = NULL; r = sd_bus_message_read_basic(m, SD_BUS_TYPE_STRING, &name); if (r < 0) return r; if (found_properties) { r = set_ensure_allocated(found_properties, &string_hash_ops); if (r < 0) return log_oom(); r = set_put(*found_properties, name); if (r < 0 && r != -EEXIST) return log_oom(); } name_with_equal = strappend(name, "="); if (!name_with_equal) return log_oom(); if (!filter || strv_find(filter, name) || (expected_value = strv_find_startswith(filter, name_with_equal))) { 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; if (func) r = func(name, expected_value, m, value, all); if (!func || r == 0) r = bus_print_property(name, expected_value, m, value, all); if (r < 0) return r; if (r == 0) { if (all && !expected_value) printf("%s=[unprintable]\n", name); /* skip what we didn't read */ r = sd_bus_message_skip(m, contents); 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; r = sd_bus_message_exit_container(m); if (r < 0) return r; return 0; } int bus_print_all_properties( sd_bus *bus, const char *dest, const char *path, bus_message_print_t func, char **filter, bool value, bool all, Set **found_properties) { _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; return bus_message_print_all_properties(reply, func, filter, value, all, found_properties); } 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, unsigned flags, 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 **p = userdata; const char *s; r = sd_bus_message_read_basic(m, type, &s); if (r < 0) return r; if (isempty(s)) s = NULL; if (flags & BUS_MAP_STRDUP) return free_and_strdup((char **) userdata, s); *p = s; return 0; } 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) return r; return strv_free_and_replace(*p, l); } case SD_BUS_TYPE_BOOLEAN: { int b; r = sd_bus_message_read_basic(m, type, &b); if (r < 0) return r; if (flags & BUS_MAP_BOOLEAN_AS_BOOL) *(bool*) userdata = b; else *(int*) userdata = b; return 0; } case SD_BUS_TYPE_INT32: case SD_BUS_TYPE_UINT32: { uint32_t u, *p = userdata; r = sd_bus_message_read_basic(m, type, &u); if (r < 0) return r; *p = u; return 0; } case SD_BUS_TYPE_INT64: case SD_BUS_TYPE_UINT64: { uint64_t t, *p = userdata; r = sd_bus_message_read_basic(m, type, &t); if (r < 0) return r; *p = t; return 0; } case SD_BUS_TYPE_DOUBLE: { double d, *p = userdata; r = sd_bus_message_read_basic(m, type, &d); if (r < 0) return r; *p = d; return 0; }} return -EOPNOTSUPP; } int bus_message_map_all_properties( sd_bus_message *m, const struct bus_properties_map *map, unsigned flags, sd_bus_error *error, void *userdata) { 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, flags, 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_map_all_properties( sd_bus *bus, const char *destination, const char *path, const struct bus_properties_map *map, unsigned flags, sd_bus_error *error, sd_bus_message **reply, void *userdata) { _cleanup_(sd_bus_message_unrefp) sd_bus_message *m = NULL; int r; assert(bus); assert(destination); assert(path); assert(map); assert(reply || (flags & BUS_MAP_STRDUP)); r = sd_bus_call_method( bus, destination, path, "org.freedesktop.DBus.Properties", "GetAll", error, &m, "s", ""); if (r < 0) return r; r = bus_message_map_all_properties(m, map, flags, error, userdata); if (r < 0) return r; if (reply) *reply = sd_bus_message_ref(m); return r; } int bus_connect_transport(BusTransport transport, const char *host, bool user, sd_bus **ret) { _cleanup_(sd_bus_close_unrefp) sd_bus *bus = NULL; int r; assert(transport >= 0); assert(transport < _BUS_TRANSPORT_MAX); assert(ret); 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 { if (sd_booted() <= 0) { /* Print a friendly message when the local system is actually not running systemd as PID 1. */ log_error("System has not been booted with systemd as init system (PID 1). Can't operate."); return -EHOSTDOWN; } 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."); } if (r < 0) return r; r = sd_bus_set_exit_on_disconnect(bus, true); if (r < 0) return r; *ret = TAKE_PTR(bus); return 0; } 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 { if (sd_booted() <= 0) /* Print a friendly message when the local system is actually not running systemd as PID 1. */ return log_error_errno(SYNTHETIC_ERRNO(EHOSTDOWN), "System has not been booted with systemd as init system (PID 1). Can't operate."); 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); } int bus_property_set_bool( sd_bus *bus, const char *path, const char *interface, const char *property, sd_bus_message *value, void *userdata, sd_bus_error *error) { int b, r; r = sd_bus_message_read(value, "b", &b); if (r < 0) return r; *(bool*) userdata = b; return 0; } int bus_property_get_id128( sd_bus *bus, const char *path, const char *interface, const char *property, sd_bus_message *reply, void *userdata, sd_bus_error *error) { sd_id128_t *id = userdata; if (sd_id128_is_null(*id)) /* Add an empty array if the ID is zero */ return sd_bus_message_append(reply, "ay", 0); else return sd_bus_message_append_array(reply, 'y', id->bytes, 16); } #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"); } /** * 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 = path_join(prefix, sender_label, external_label); 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; } 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) { const char *is_soft; struct rlimit *rl; uint64_t u; rlim_t x; 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 = {}; const char *s, *p; int z; /* Chop off "Soft" suffix */ s = is_soft ? strndupa(property, is_soft - property) : property; /* Skip over any prefix, such as "Default" */ assert_se(p = strstr(s, "Limit")); z = rlimit_from_string(p + 5); assert(z >= 0); (void) 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); } int bus_track_add_name_many(sd_bus_track *t, char **l) { int r = 0; char **i; assert(t); /* Continues adding after failure, and returns the first failure. */ STRV_FOREACH(i, l) { int k; k = sd_bus_track_add_name(t, *i); if (k < 0 && r >= 0) r = k; } return r; } int bus_open_system_watch_bind_with_description(sd_bus **ret, const char *description) { _cleanup_(sd_bus_close_unrefp) sd_bus *bus = NULL; const char *e; int r; assert(ret); /* Match like sd_bus_open_system(), but with the "watch_bind" feature and the Connected() signal turned on. */ r = sd_bus_new(&bus); if (r < 0) return r; if (description) { r = sd_bus_set_description(bus, description); if (r < 0) return r; } e = secure_getenv("DBUS_SYSTEM_BUS_ADDRESS"); if (!e) e = DEFAULT_SYSTEM_BUS_ADDRESS; r = sd_bus_set_address(bus, e); if (r < 0) return r; r = sd_bus_set_bus_client(bus, true); if (r < 0) return r; r = sd_bus_set_trusted(bus, true); if (r < 0) return r; r = sd_bus_negotiate_creds(bus, true, SD_BUS_CREDS_UID|SD_BUS_CREDS_EUID|SD_BUS_CREDS_EFFECTIVE_CAPS); if (r < 0) return r; r = sd_bus_set_watch_bind(bus, true); if (r < 0) return r; r = sd_bus_set_connected_signal(bus, true); if (r < 0) return r; r = sd_bus_start(bus); if (r < 0) return r; *ret = TAKE_PTR(bus); return 0; } int bus_reply_pair_array(sd_bus_message *m, char **l) { _cleanup_(sd_bus_message_unrefp) sd_bus_message *reply = NULL; char **k, **v; int r; assert(m); /* Reply to the specified message with a message containing a dictionary put together from the specified * strv */ r = sd_bus_message_new_method_return(m, &reply); if (r < 0) return r; r = sd_bus_message_open_container(reply, 'a', "{ss}"); if (r < 0) return r; STRV_FOREACH_PAIR(k, v, l) { r = sd_bus_message_append(reply, "{ss}", *k, *v); if (r < 0) return r; } r = sd_bus_message_close_container(reply); if (r < 0) return r; return sd_bus_send(NULL, reply, NULL); } static void bus_message_unref_wrapper(void *m) { sd_bus_message_unref(m); } const struct hash_ops bus_message_hash_ops = { .hash = trivial_hash_func, .compare = trivial_compare_func, .free_value = bus_message_unref_wrapper, };