diff options
Diffstat (limited to 'src/libshared/bus-util.c')
-rw-r--r-- | src/libshared/bus-util.c | 1571 |
1 files changed, 1571 insertions, 0 deletions
diff --git a/src/libshared/bus-util.c b/src/libshared/bus-util.c new file mode 100644 index 0000000000..62b5585e84 --- /dev/null +++ b/src/libshared/bus-util.c @@ -0,0 +1,1571 @@ +/*** + 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 <errno.h> +#include <fcntl.h> +#include <inttypes.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <sys/ioctl.h> +#include <sys/resource.h> +#include <sys/socket.h> +#include <unistd.h> + +#include <systemd/sd-bus-protocol.h> +#include <systemd/sd-bus.h> +#include <systemd/sd-daemon.h> +#include <systemd/sd-event.h> +#include <systemd/sd-id128.h> + +#include "alloc-util.h" +#include "bus-internal.h" +#include "bus-label.h" +#include "bus-message.h" +#include "bus-util.h" +#include "def.h" +#include "escape.h" +#include "fd-util.h" +#include "missing.h" +#include "parse-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) { + _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"); +} + +/** + * 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); +} |