chiark / gitweb /
bus: properly serialize unit file change list
[elogind.git] / src / libsystemd-bus / bus-util.c
index 6a2fb04a777441cc2e6e5836823751997f5f6b65..2140dbc676888c29f25a88832033bfedcae9d318 100644 (file)
 
 #include <sys/socket.h>
 
-#include "sd-event.h"
-#include "sd-bus.h"
-
 #include "util.h"
+#include "strv.h"
 #include "macro.h"
 #include "def.h"
+#include "missing.h"
 
+#include "sd-event.h"
+#include "sd-bus.h"
+#include "bus-error.h"
+#include "bus-message.h"
 #include "bus-util.h"
+#include "bus-internal.h"
 
-static int quit_callback(sd_bus *bus, sd_bus_message *m, void *userdata) {
+static int quit_callback(sd_bus *bus, sd_bus_message *m, void *userdata, sd_bus_error *ret_error) {
         sd_event *e = userdata;
 
         assert(bus);
@@ -99,25 +103,6 @@ int bus_event_loop_with_idle(sd_event *e, sd_bus *bus, const char *name, usec_t
         return 0;
 }
 
-int bus_property_get_tristate(
-                sd_bus *bus,
-                const char *path,
-                const char *interface,
-                const char *property,
-                sd_bus_message *reply,
-                sd_bus_error *error,
-                void *userdata) {
-
-        int *tristate = userdata;
-        int r;
-
-        r = sd_bus_message_append(reply, "b", *tristate > 0);
-        if (r < 0)
-                return r;
-
-        return 1;
-}
-
 int bus_verify_polkit(
                 sd_bus *bus,
                 sd_bus_message *m,
@@ -148,7 +133,7 @@ int bus_verify_polkit(
 #ifdef ENABLE_POLKIT
         else {
                 _cleanup_bus_message_unref_ sd_bus_message *reply = NULL;
-                unsigned authorized = false, challenge = false;
+                int authorized = false, challenge = false;
 
                 r = sd_bus_call_method(
                                 bus,
@@ -175,9 +160,9 @@ int bus_verify_polkit(
                         return r;
                 }
 
-                r = sd_bus_message_read(reply, "(bb)", &authorized, &challenge);
-                if (r < 0)
-                        return r;
+                r = sd_bus_message_enter_container(reply, 'r', "bba{ss}");
+                if (r >= 0)
+                        r = sd_bus_message_read(reply, "bb", &authorized, &challenge);
 
                 if (authorized)
                         return 1;
@@ -199,11 +184,30 @@ typedef struct AsyncPolkitQuery {
         sd_bus_message_handler_t callback;
         void *userdata;
         uint64_t serial;
+        Hashmap *registry;
 } AsyncPolkitQuery;
 
-static int async_polkit_callback(sd_bus *bus, sd_bus_message *reply, void *userdata) {
-        AsyncPolkitQuery *q = userdata;
+static void async_polkit_query_free(sd_bus *b, AsyncPolkitQuery *q) {
+
+        if (!q)
+                return;
+
+        if (q->serial > 0 && b)
+                sd_bus_call_async_cancel(b, q->serial);
+
+        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 *bus, sd_bus_message *reply, void *userdata, sd_bus_error *error) {
+        _cleanup_bus_error_free_ sd_bus_error error_buffer = SD_BUS_ERROR_NULL;
         _cleanup_bus_message_unref_ sd_bus_message *m = NULL;
+        AsyncPolkitQuery *q = userdata;
         int r;
 
         assert(bus);
@@ -213,30 +217,18 @@ static int async_polkit_callback(sd_bus *bus, sd_bus_message *reply, void *userd
         q->reply = sd_bus_message_ref(reply);
         q->serial = 0;
 
-        m = sd_bus_message_ref(q->request);
-
-        r = sd_bus_message_rewind(m, true);
-        if (r < 0)
-                return r;
-
-        r = q->callback(bus, m, q->userdata);
-        if (r < 0)
-                return r;
-
-        return 1;
-}
-
-static void async_polkit_query_free(sd_bus *b, AsyncPolkitQuery *q) {
-
-        if (!q)
-                return;
+        r = sd_bus_message_rewind(q->request, true);
+        if (r < 0) {
+                r = sd_bus_reply_method_errno(q->request, r, NULL);
+                goto finish;
+        }
 
-        if (q->serial >  0 && b)
-                sd_bus_send_with_reply_cancel(b, q->serial);
+        r = q->callback(bus, q->request, q->userdata, &error_buffer);
+        r = bus_maybe_reply_error(q->request, r, &error_buffer);
 
-        sd_bus_message_unref(q->request);
-        sd_bus_message_unref(q->reply);
-        free(q);
+finish:
+        async_polkit_query_free(bus, q);
+        return r;
 }
 
 #endif
@@ -265,9 +257,9 @@ int bus_verify_polkit_async(
         assert(action);
 
 #ifdef ENABLE_POLKIT
-        q = hashmap_remove(*registry, m);
+        q = hashmap_get(*registry, m);
         if (q) {
-                unsigned authorized, challenge;
+                int authorized, challenge;
 
                 /* This is the second invocation of this function, and
                  * there's already a response from polkit, let's
@@ -277,26 +269,21 @@ int bus_verify_polkit_async(
                 if (sd_bus_message_is_method_error(q->reply, NULL)) {
                         const sd_bus_error *e;
 
-                        /* Treat no PK available as access denied */
-                        if (sd_bus_message_is_method_error(q->reply, SD_BUS_ERROR_SERVICE_UNKNOWN)) {
-                                async_polkit_query_free(bus, q);
-                                return -EACCES;
-                        }
-
+                        /* Copy error from polkit reply */
                         e = sd_bus_message_get_error(q->reply);
                         sd_bus_error_copy(error, e);
-                        r = sd_bus_error_get_errno(e);
 
-                        async_polkit_query_free(bus, q);
-                        return r;
+                        /* 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);
 
-                async_polkit_query_free(bus, q);
-
                 if (r < 0)
                         return r;
 
@@ -340,7 +327,7 @@ int bus_verify_polkit_async(
                         action,
                         0,
                         interactive ? 1 : 0,
-                        "");
+                        NULL);
         if (r < 0)
                 return r;
 
@@ -358,9 +345,13 @@ int bus_verify_polkit_async(
                 return r;
         }
 
-        r = sd_bus_send_with_reply(bus, pk, async_polkit_callback, q, 0, &q->serial);
-        if (r < 0)
+        q->registry = *registry;
+
+        r = sd_bus_call_async(bus, pk, async_polkit_callback, q, 0, &q->serial);
+        if (r < 0) {
+                async_polkit_query_free(bus, q);
                 return r;
+        }
 
         return 0;
 #endif
@@ -379,27 +370,23 @@ void bus_verify_polkit_async_registry_free(sd_bus *bus, Hashmap *registry) {
 #endif
 }
 
-static int bus_check_peercred(sd_bus *c) {
-        int fd;
+int bus_check_peercred(sd_bus *c) {
         struct ucred ucred;
         socklen_t l;
+        int fd;
 
         assert(c);
 
         fd = sd_bus_get_fd(c);
-
-        assert(fd >= 0);
+        if (fd < 0)
+                return fd;
 
         l = sizeof(struct ucred);
-        if (getsockopt(fd, SOL_SOCKET, SO_PEERCRED, &ucred, &l) < 0) {
-                log_error("SO_PEERCRED failed: %m");
+        if (getsockopt(fd, SOL_SOCKET, SO_PEERCRED, &ucred, &l) < 0)
                 return -errno;
-        }
 
-        if (l != sizeof(struct ucred)) {
-                log_error("SO_PEERCRED returned wrong size.");
+        if (l != sizeof(struct ucred))
                 return -E2BIG;
-        }
 
         if (ucred.uid != 0 && ucred.uid != geteuid())
                 return -EPERM;
@@ -407,96 +394,100 @@ static int bus_check_peercred(sd_bus *c) {
         return 1;
 }
 
-int bus_connect_system(sd_bus **_bus) {
-        sd_bus *bus = NULL;
+int bus_open_system_systemd(sd_bus **_bus) {
+        _cleanup_bus_unref_ sd_bus *bus = NULL;
         int r;
-        bool private = true;
 
         assert(_bus);
 
-        if (geteuid() == 0) {
-                /* If we are root, then let's talk directly to the
-                 * system instance, instead of going via the bus */
+        if (geteuid() != 0)
+                return sd_bus_open_system(_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 r;
+        /* If we are root, then let's talk directly to the system
+         * instance, instead of going via the bus */
 
-        } else {
-                r = sd_bus_open_system(&bus);
-                if (r < 0)
-                        return r;
+        r = sd_bus_new(&bus);
+        if (r < 0)
+                return r;
 
-                private = false;
-        }
+        r = sd_bus_set_address(bus, "unix:path=/run/systemd/private");
+        if (r < 0)
+                return r;
 
-        if (private) {
-                r = bus_check_peercred(bus);
-                if (r < 0) {
-                        sd_bus_unref(bus);
+        r = sd_bus_start(bus);
+        if (r < 0)
+                return r;
 
-                        return -EACCES;
-                }
-        }
+        r = bus_check_peercred(bus);
+        if (r < 0)
+                return r;
 
         *_bus = bus;
+        bus = NULL;
+
         return 0;
 }
 
-int bus_connect_system_ssh(const char *host, sd_bus **_bus) {
-        sd_bus *bus;
-        char *p = NULL;
+int bus_open_user_systemd(sd_bus **_bus) {
+        _cleanup_bus_unref_ sd_bus *bus = NULL;
+        _cleanup_free_ char *p = NULL;
+        const char *e;
         int r;
 
+        /* If we are supposed to talk to the instance, try via
+         * XDG_RUNTIME_DIR first, then fallback to normal bus
+         * access */
+
         assert(_bus);
-        assert(host);
 
-        asprintf(&p, "unixexec:path=ssh,argv1=-xT,argv2=%s,argv3=systemd-stdio-bridge", host);
-        if (!p)
-                return -ENOMEM;
+        e = secure_getenv("XDG_RUNTIME_DIR");
+        if (e) {
+                if (asprintf(&p, "unix:path=%s/systemd/private", e) < 0)
+                        return -ENOMEM;
+        }
 
-       r = sd_bus_new(&bus);
-       if (r < 0)
-               return r;
+        r = sd_bus_new(&bus);
+        if (r < 0)
+                return r;
 
-       r = sd_bus_set_address(bus, p);
-       if (r < 0)
-               return r;
+        r = sd_bus_set_address(bus, p);
+        if (r < 0)
+                return r;
 
-       r = sd_bus_set_bus_client(bus, true);
-       if (r < 0)
-               return r;
+        r = sd_bus_start(bus);
+        if (r < 0)
+                return r;
 
-       r = sd_bus_start(bus);
+        r = bus_check_peercred(bus);
         if (r < 0)
                 return r;
 
         *_bus = bus;
+        bus = NULL;
+
         return 0;
 }
 
-int bus_generic_print_property(const char *name, sd_bus_message *property, bool all) {
+int bus_print_property(const char *name, sd_bus_message *property, bool all) {
         char type;
         const char *contents;
+        int r;
 
         assert(name);
         assert(property);
 
-        sd_bus_message_peek_type(property, &type, &contents);
+        r = sd_bus_message_peek_type(property, &type, &contents);
+        if (r < 0)
+                return r;
 
         switch (type) {
 
         case SD_BUS_TYPE_STRING: {
                 const char *s;
-                sd_bus_message_read_basic(property, type, &s);
+
+                r = sd_bus_message_read_basic(property, type, &s);
+                if (r < 0)
+                        return r;
 
                 if (all || !isempty(s))
                         printf("%s=%s\n", name, s);
@@ -507,7 +498,10 @@ int bus_generic_print_property(const char *name, sd_bus_message *property, bool
         case SD_BUS_TYPE_BOOLEAN: {
                 bool b;
 
-                sd_bus_message_read_basic(property, type, &b);
+                r = sd_bus_message_read_basic(property, type, &b);
+                if (r < 0)
+                        return r;
+
                 printf("%s=%s\n", name, yes_no(b));
 
                 return 1;
@@ -516,7 +510,9 @@ int bus_generic_print_property(const char *name, sd_bus_message *property, bool
         case SD_BUS_TYPE_UINT64: {
                 uint64_t u;
 
-                sd_bus_message_read_basic(property, type, &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 */
@@ -541,7 +537,9 @@ int bus_generic_print_property(const char *name, sd_bus_message *property, bool
         case SD_BUS_TYPE_UINT32: {
                 uint32_t u;
 
-                sd_bus_message_read_basic(property, type, &u);
+                r = sd_bus_message_read_basic(property, type, &u);
+                if (r < 0)
+                        return r;
 
                 if (strstr(name, "UMask") || strstr(name, "Mode"))
                         printf("%s=%04o\n", name, u);
@@ -554,7 +552,9 @@ int bus_generic_print_property(const char *name, sd_bus_message *property, bool
         case SD_BUS_TYPE_INT32: {
                 int32_t i;
 
-                sd_bus_message_read_basic(property, type, &i);
+                r = sd_bus_message_read_basic(property, type, &i);
+                if (r < 0)
+                        return r;
 
                 printf("%s=%i\n", name, (int) i);
                 return 1;
@@ -563,38 +563,42 @@ int bus_generic_print_property(const char *name, sd_bus_message *property, bool
         case SD_BUS_TYPE_DOUBLE: {
                 double d;
 
-                sd_bus_message_read_basic(property, type, &d);
+                r = sd_bus_message_read_basic(property, type, &d);
+                if (r < 0)
+                        return r;
 
                 printf("%s=%g\n", name, d);
                 return 1;
         }
 
         case SD_BUS_TYPE_ARRAY:
-
                 if (streq(contents, "s")) {
-                        bool space = false;
-                        char tp;
-                        const char *cnt;
-
-                        sd_bus_message_enter_container(property, SD_BUS_TYPE_ARRAY, contents);
+                        bool first = true;
+                        const char *str;
 
-                        sd_bus_message_peek_type(property, &tp, &cnt);
-                        if (all || cnt) {
-                               const char *str;
-
-                                printf("%s=", name);
+                        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) {
+                                if (first)
+                                        printf("%s=", name);
 
-                                while(sd_bus_message_read_basic(property, SD_BUS_TYPE_STRING, &str)) {
-                                        printf("%s%s", space ? " " : "", str);
+                                printf("%s%s", first ? "" : " ", str);
 
-                                        space = true;
-                                }
+                                first = false;
+                        }
+                        if (r < 0)
+                                return r;
 
+                        if (first && all)
+                                printf("%s=", name);
+                        if (!first || all)
                                 puts("");
-                        }
 
-                        sd_bus_message_exit_container(property);
+                        r = sd_bus_message_exit_container(property);
+                        if (r < 0)
+                                return r;
 
                         return 1;
 
@@ -602,7 +606,10 @@ int bus_generic_print_property(const char *name, sd_bus_message *property, bool
                         const uint8_t *u;
                         size_t n;
 
-                        sd_bus_message_read_array(property, SD_BUS_TYPE_BYTE, (const void**) &u, &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;
 
@@ -620,7 +627,10 @@ int bus_generic_print_property(const char *name, sd_bus_message *property, bool
                         uint32_t *u;
                         size_t n;
 
-                        sd_bus_message_read_array(property, SD_BUS_TYPE_UINT32, (const void**) &u, &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;
 
@@ -640,3 +650,467 @@ int bus_generic_print_property(const char *name, sd_bus_message *property, bool
 
         return 0;
 }
+
+int bus_print_all_properties(sd_bus *bus, const char *dest, const char *path, char **filter, bool all) {
+        _cleanup_bus_message_unref_ sd_bus_message *reply = NULL;
+        _cleanup_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, 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 *str;
+                char **p = userdata;
+
+                r = sd_bus_message_read_basic(m, type, &s);
+                if (r < 0)
+                        break;
+
+                if (isempty(s))
+                        break;
+
+                str = strdup(s);
+                if (!str) {
+                        r = -ENOMEM;
+                        break;
+                }
+                free(*p);
+                *p = str;
+
+                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: {
+                uint64_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_map_all_properties(sd_bus *bus,
+                           const char *destination,
+                           const char *path,
+                           const struct bus_properties_map *map,
+                           void *userdata) {
+        _cleanup_bus_message_unref_ sd_bus_message *m = NULL;
+        _cleanup_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;
+
+        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(bus, member, m, &error, v);
+                        else
+                                r = map_basic(bus, member, m, &error, v);
+
+                        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;
+        }
+
+        return r;
+}
+
+int bus_open_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, -ENOTSUP);
+
+        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(host, bus);
+                break;
+
+        case BUS_TRANSPORT_CONTAINER:
+                r = sd_bus_open_system_container(host, bus);
+                break;
+
+        default:
+                assert_not_reached("Hmm, unknown transport type.");
+        }
+
+        return r;
+}
+
+int bus_open_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, -ENOTSUP);
+
+        switch (transport) {
+
+        case BUS_TRANSPORT_LOCAL:
+                if (user)
+                        r = bus_open_user_systemd(bus);
+                else
+                        r = bus_open_system_systemd(bus);
+
+                break;
+
+        case BUS_TRANSPORT_REMOTE:
+                r = sd_bus_open_system_remote(host, bus);
+                break;
+
+        case BUS_TRANSPORT_CONTAINER:
+                r = sd_bus_open_system_container(host, bus);
+                break;
+
+        default:
+                assert_not_reached("Hmm, unknown transport type.");
+        }
+
+        return r;
+}
+
+int bus_property_get_tristate(
+                sd_bus *bus,
+                const char *path,
+                const char *interface,
+                const char *property,
+                sd_bus_message *reply,
+                void *userdata,
+                sd_bus_error *error) {
+
+        int *tristate = userdata;
+
+        return sd_bus_message_append(reply, "b", *tristate > 0);
+}
+
+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) {
+        log_error("Failed to parse message: %s", strerror(-r));
+        return r;
+}
+
+int bus_log_create_error(int r) {
+        log_error("Failed to create message: %s", strerror(-r));
+        return r;
+}
+
+int bus_parse_unit_info(sd_bus_message *message, UnitInfo *u) {
+        assert(message);
+        assert(u);
+
+        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_maybe_reply_error(sd_bus_message *m, int r, sd_bus_error *error) {
+        assert(m);
+
+        if (r < 0) {
+                if (m->header->type == SD_BUS_MESSAGE_METHOD_CALL)
+                        sd_bus_reply_method_errno(m, r, error);
+
+        } else if (sd_bus_error_is_set(error)) {
+                if (m->header->type == SD_BUS_MESSAGE_METHOD_CALL)
+                        sd_bus_reply_method_error(m, error);
+        } else
+                return r;
+
+        log_debug("Failed to process message [type=%s sender=%s path=%s interface=%s member=%s signature=%s]: %s",
+                  bus_message_type_to_string(m->header->type),
+                  strna(m->sender),
+                  strna(m->path),
+                  strna(m->interface),
+                  strna(m->member),
+                  strna(m->root_container.signature),
+                  bus_error_message(error, r));
+
+        return 1;
+}