X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?p=elogind.git;a=blobdiff_plain;f=src%2Flibsystemd-bus%2Fbus-message.c;h=437f6dfd49d89840e1fbe716d7409eb0e7afeac0;hp=138d664f3cb2aadaa00c796ac91815ddca992046;hb=cd6f997f71c3aba16aa08226d423d14cbc787f82;hpb=80ba3b84ddf40fccbc21184c2da41d97fe85633d

diff --git a/src/libsystemd-bus/bus-message.c b/src/libsystemd-bus/bus-message.c
index 138d664f3..437f6dfd4 100644
--- a/src/libsystemd-bus/bus-message.c
+++ b/src/libsystemd-bus/bus-message.c
@@ -450,16 +450,11 @@ int sd_bus_message_new_signal(
         sd_bus_message *t;
         int r;
 
-        if (!path)
-                return -EINVAL;
-        if (!interface)
-                return -EINVAL;
-        if (!member)
-                return -EINVAL;
-        if (!m)
-                return -EINVAL;
-        if (bus && bus->state == BUS_UNSET)
-                return -ENOTCONN;
+        assert_return(!bus || bus->state != BUS_UNSET, -ENOTCONN);
+        assert_return(object_path_is_valid(path), -EINVAL);
+        assert_return(interface_name_is_valid(interface), -EINVAL);
+        assert_return(member_name_is_valid(member), -EINVAL);
+        assert_return(m, -EINVAL);
 
         t = message_new(bus, SD_BUS_MESSAGE_SIGNAL);
         if (!t)
@@ -496,18 +491,12 @@ int sd_bus_message_new_method_call(
         sd_bus_message *t;
         int r;
 
-        if (destination && !service_name_is_valid(destination))
-                return -EINVAL;
-        if (!object_path_is_valid(path))
-                return -EINVAL;
-        if (interface && !interface_name_is_valid(interface))
-                return -EINVAL;
-        if (!member_name_is_valid(member))
-                return -EINVAL;
-        if (!m)
-                return -EINVAL;
-        if (bus && bus->state == BUS_UNSET)
-                return -ENOTCONN;
+        assert_return(!bus || bus->state != BUS_UNSET, -ENOTCONN);
+        assert_return(!destination || service_name_is_valid(destination), -EINVAL);
+        assert_return(object_path_is_valid(path), -EINVAL);
+        assert_return(!interface || interface_name_is_valid(interface), -EINVAL);
+        assert_return(member_name_is_valid(member), -EINVAL);
+        assert_return(m, -EINVAL);
 
         t = message_new(bus, SD_BUS_MESSAGE_METHOD_CALL);
         if (!t)
@@ -549,16 +538,11 @@ static int message_new_reply(
         sd_bus_message *t;
         int r;
 
-        if (!call)
-                return -EINVAL;
-        if (!call->sealed)
-                return -EPERM;
-        if (call->header->type != SD_BUS_MESSAGE_METHOD_CALL)
-                return -EINVAL;
-        if (!m)
-                return -EINVAL;
-        if (bus && bus->state == BUS_UNSET)
-                return -ENOTCONN;
+        assert_return(!bus || bus->state != BUS_UNSET, -ENOTCONN);
+        assert_return(call, -EINVAL);
+        assert_return(call->sealed, -EPERM);
+        assert_return(call->header->type == SD_BUS_MESSAGE_METHOD_CALL, -EINVAL);
+        assert_return(m, -EINVAL);
 
         t = message_new(bus, type);
         if (!t)
@@ -604,10 +588,8 @@ int sd_bus_message_new_method_error(
         sd_bus_message *t;
         int r;
 
-        if (!sd_bus_error_is_set(e))
-                return -EINVAL;
-        if (!m)
-                return -EINVAL;
+        assert_return(sd_bus_error_is_set(e), -EINVAL);
+        assert_return(m, -EINVAL);
 
         r = message_new_reply(bus, call, SD_BUS_MESSAGE_METHOD_ERROR, &t);
         if (r < 0)
@@ -743,8 +725,7 @@ fail:
 }
 
 sd_bus_message* sd_bus_message_ref(sd_bus_message *m) {
-        if (!m)
-                return NULL;
+        assert_return(m, NULL);
 
         assert(m->n_ref > 0);
         m->n_ref++;
@@ -753,8 +734,7 @@ sd_bus_message* sd_bus_message_ref(sd_bus_message *m) {
 }
 
 sd_bus_message* sd_bus_message_unref(sd_bus_message *m) {
-        if (!m)
-                return NULL;
+        assert_return(m, NULL);
 
         assert(m->n_ref > 0);
         m->n_ref--;
@@ -766,227 +746,175 @@ sd_bus_message* sd_bus_message_unref(sd_bus_message *m) {
 }
 
 int sd_bus_message_get_type(sd_bus_message *m, uint8_t *type) {
-        if (!m)
-                return -EINVAL;
-        if (!type)
-                return -EINVAL;
+        assert_return(m, -EINVAL);
+        assert_return(type, -EINVAL);
 
         *type = m->header->type;
         return 0;
 }
 
 int sd_bus_message_get_serial(sd_bus_message *m, uint64_t *serial) {
-        if (!m)
-                return -EINVAL;
-        if (!serial)
-                return -EINVAL;
-        if (m->header->serial == 0)
-                return -ENOENT;
+        assert_return(m, -EINVAL);
+        assert_return(serial, -EINVAL);
+        assert_return(m->header->serial != 0, -ENOENT);
 
         *serial = BUS_MESSAGE_SERIAL(m);
         return 0;
 }
 
 int sd_bus_message_get_reply_serial(sd_bus_message *m, uint64_t *serial) {
-        if (!m)
-                return -EINVAL;
-        if (!serial)
-                return -EINVAL;
-        if (m->reply_serial == 0)
-                return -ENOENT;
+        assert_return(m, -EINVAL);
+        assert_return(serial, -EINVAL);
+        assert_return(m->reply_serial != 0, -ENOENT);
 
         *serial = m->reply_serial;
         return 0;
 }
 
 int sd_bus_message_get_no_reply(sd_bus_message *m) {
-        if (!m)
-                return -EINVAL;
+        assert_return(m, -EINVAL);
 
         return m->header->type == SD_BUS_MESSAGE_METHOD_CALL ? !!(m->header->flags & SD_BUS_MESSAGE_NO_REPLY_EXPECTED) : 0;
 }
 
 const char *sd_bus_message_get_path(sd_bus_message *m) {
-        if (!m)
-                return NULL;
+        assert_return(m, NULL);
 
         return m->path;
 }
 
 const char *sd_bus_message_get_interface(sd_bus_message *m) {
-        if (!m)
-                return NULL;
+        assert_return(m, NULL);
 
         return m->interface;
 }
 
 const char *sd_bus_message_get_member(sd_bus_message *m) {
-        if (!m)
-                return NULL;
+        assert_return(m, NULL);
 
         return m->member;
 }
 const char *sd_bus_message_get_destination(sd_bus_message *m) {
-        if (!m)
-                return NULL;
+        assert_return(m, NULL);
 
         return m->destination;
 }
 
 const char *sd_bus_message_get_sender(sd_bus_message *m) {
-        if (!m)
-                return NULL;
+        assert_return(m, NULL);
 
         return m->sender;
 }
 
 const sd_bus_error *sd_bus_message_get_error(sd_bus_message *m) {
-        if (!m)
-                return NULL;
-
-        if (!sd_bus_error_is_set(&m->error))
-                return NULL;
+        assert_return(m, NULL);
+        assert_return(sd_bus_error_is_set(&m->error), NULL);
 
         return &m->error;
 }
 
 int sd_bus_message_get_uid(sd_bus_message *m, uid_t *uid) {
-        if (!m)
-                return -EINVAL;
-        if (!uid)
-                return -EINVAL;
-        if (!m->uid_valid)
-                return -ESRCH;
+        assert_return(m, -EINVAL);
+        assert_return(uid, -EINVAL);
+        assert_return(m->uid_valid, -ESRCH);
 
         *uid = m->uid;
         return 0;
 }
 
 int sd_bus_message_get_gid(sd_bus_message *m, gid_t *gid) {
-        if (!m)
-                return -EINVAL;
-        if (!gid)
-                return -EINVAL;
-        if (!m->gid_valid)
-                return -ESRCH;
+        assert_return(m, -EINVAL);
+        assert_return(gid, -EINVAL);
+        assert_return(m->gid_valid, -ESRCH);
 
         *gid = m->gid;
         return 0;
 }
 
 int sd_bus_message_get_pid(sd_bus_message *m, pid_t *pid) {
-        if (!m)
-                return -EINVAL;
-        if (!pid)
-                return -EINVAL;
-        if (m->pid <= 0)
-                return -ESRCH;
+        assert_return(m, -EINVAL);
+        assert_return(pid, -EINVAL);
+        assert_return(m->pid > 0, -ESRCH);
 
         *pid = m->pid;
         return 0;
 }
 
 int sd_bus_message_get_tid(sd_bus_message *m, pid_t *tid) {
-        if (!m)
-                return -EINVAL;
-        if (!tid)
-                return -EINVAL;
-        if (m->tid <= 0)
-                return -ESRCH;
+        assert_return(m, -EINVAL);
+        assert_return(tid, -EINVAL);
+        assert_return(m->tid > 0, -ESRCH);
 
         *tid = m->tid;
         return 0;
 }
 
 int sd_bus_message_get_pid_starttime(sd_bus_message *m, uint64_t *usec) {
-        if (!m)
-                return -EINVAL;
-        if (!usec)
-                return -EINVAL;
-        if (m->pid_starttime <= 0)
-                return -ESRCH;
+        assert_return(m, -EINVAL);
+        assert_return(usec, -EINVAL);
+        assert_return(m->pid_starttime > 0, -ESRCH);
 
         *usec = m->pid_starttime;
         return 0;
 }
 
 int sd_bus_message_get_selinux_context(sd_bus_message *m, const char **ret) {
-        if (!m)
-                return -EINVAL;
-        if (!m->label)
-                return -ESRCH;
+        assert_return(m, -EINVAL);
+        assert_return(m->label, -ESRCH);
 
         *ret = m->label;
         return 0;
 }
 
 int sd_bus_message_get_monotonic_timestamp(sd_bus_message *m, uint64_t *usec) {
-        if (!m)
-                return -EINVAL;
-        if (!usec)
-                return -EINVAL;
-        if (m->monotonic <= 0)
-                return -ESRCH;
+        assert_return(m, -EINVAL);
+        assert_return(usec, -EINVAL);
+        assert_return(m->monotonic > 0, -ESRCH);
 
         *usec = m->monotonic;
         return 0;
 }
 
 int sd_bus_message_get_realtime_timestamp(sd_bus_message *m, uint64_t *usec) {
-        if (!m)
-                return -EINVAL;
-        if (!usec)
-                return -EINVAL;
-        if (m->realtime <= 0)
-                return -ESRCH;
+        assert_return(m, -EINVAL);
+        assert_return(usec, -EINVAL);
+        assert_return(m->realtime > 0, -ESRCH);
 
         *usec = m->realtime;
         return 0;
 }
 
 int sd_bus_message_get_comm(sd_bus_message *m, const char **ret) {
-        if (!m)
-                return -EINVAL;
-        if (!ret)
-                return -EINVAL;
-        if (!m->comm)
-                return -ESRCH;
+        assert_return(m, -EINVAL);
+        assert_return(ret, -EINVAL);
+        assert_return(m->comm, -ESRCH);
 
         *ret = m->comm;
         return 0;
 }
 
 int sd_bus_message_get_tid_comm(sd_bus_message *m, const char **ret) {
-        if (!m)
-                return -EINVAL;
-        if (!ret)
-                return -EINVAL;
-        if (!m->tid_comm)
-                return -ESRCH;
+        assert_return(m, -EINVAL);
+        assert_return(ret, -EINVAL);
+        assert_return(m->tid_comm, -ESRCH);
 
         *ret = m->tid_comm;
         return 0;
 }
 
 int sd_bus_message_get_exe(sd_bus_message *m, const char **ret) {
-        if (!m)
-                return -EINVAL;
-        if (!ret)
-                return -EINVAL;
-        if (!m->exe)
-                return -ESRCH;
+        assert_return(m, -EINVAL);
+        assert_return(ret, -EINVAL);
+        assert_return(m->exe, -ESRCH);
 
         *ret = m->exe;
         return 0;
 }
 
 int sd_bus_message_get_cgroup(sd_bus_message *m, const char **ret) {
-        if (!m)
-                return -EINVAL;
-        if (!ret)
-                return -EINVAL;
-        if (!m->cgroup)
-                return -ESRCH;
+        assert_return(m, -EINVAL);
+        assert_return(ret, -EINVAL);
+        assert_return(m->cgroup, -ESRCH);
 
         *ret = m->cgroup;
         return 0;
@@ -995,12 +923,9 @@ int sd_bus_message_get_cgroup(sd_bus_message *m, const char **ret) {
 int sd_bus_message_get_unit(sd_bus_message *m, const char **ret) {
         int r;
 
-        if (!m)
-                return -EINVAL;
-        if (!ret)
-                return -EINVAL;
-        if (!m->cgroup)
-                return -ESRCH;
+        assert_return(m, -EINVAL);
+        assert_return(ret, -EINVAL);
+        assert_return(m->cgroup, -ESRCH);
 
         if (!m->unit) {
                 r = cg_path_get_unit(m->cgroup, &m->unit);
@@ -1015,12 +940,9 @@ int sd_bus_message_get_unit(sd_bus_message *m, const char **ret) {
 int sd_bus_message_get_user_unit(sd_bus_message *m, const char **ret) {
         int r;
 
-        if (!m)
-                return -EINVAL;
-        if (!ret)
-                return -EINVAL;
-        if (!m->cgroup)
-                return -ESRCH;
+        assert_return(m, -EINVAL);
+        assert_return(ret, -EINVAL);
+        assert_return(m->cgroup, -ESRCH);
 
         if (!m->user_unit) {
                 r = cg_path_get_user_unit(m->cgroup, &m->user_unit);
@@ -1035,12 +957,9 @@ int sd_bus_message_get_user_unit(sd_bus_message *m, const char **ret) {
 int sd_bus_message_get_session(sd_bus_message *m, const char **ret) {
         int r;
 
-        if (!m)
-                return -EINVAL;
-        if (!ret)
-                return -EINVAL;
-        if (!m->cgroup)
-                return -ESRCH;
+        assert_return(m, -EINVAL);
+        assert_return(ret, -EINVAL);
+        assert_return(m->cgroup, -ESRCH);
 
         if (!m->session) {
                 r = cg_path_get_session(m->cgroup, &m->session);
@@ -1053,12 +972,9 @@ int sd_bus_message_get_session(sd_bus_message *m, const char **ret) {
 }
 
 int sd_bus_message_get_owner_uid(sd_bus_message *m, uid_t *uid) {
-        if (!m)
-                return -EINVAL;
-        if (!uid)
-                return -EINVAL;
-        if (!m->cgroup)
-                return -ESRCH;
+        assert_return(m, -EINVAL);
+        assert_return(uid, -EINVAL);
+        assert_return(m->cgroup, -ESRCH);
 
         return cg_path_get_owner_uid(m->cgroup, uid);
 }
@@ -1068,11 +984,8 @@ int sd_bus_message_get_cmdline(sd_bus_message *m, char ***cmdline) {
         const char *p;
         bool first;
 
-        if (!m)
-                return -EINVAL;
-
-        if (!m->cmdline)
-                return -ENOENT;
+        assert_return(m, -EINVAL);
+        assert_return(m->cmdline, -ESRCH);
 
         for (p = m->cmdline, n = 0; p < m->cmdline + m->cmdline_length; p++)
                 if (*p == 0)
@@ -1096,24 +1009,18 @@ int sd_bus_message_get_cmdline(sd_bus_message *m, char ***cmdline) {
 }
 
 int sd_bus_message_get_audit_sessionid(sd_bus_message *m, uint32_t *sessionid) {
-        if (!m)
-                return -EINVAL;
-        if (!sessionid)
-                return -EINVAL;
-        if (!m->audit)
-                return -ESRCH;
+        assert_return(m, -EINVAL);
+        assert_return(sessionid, -EINVAL);
+        assert_return(m->audit, -ESRCH);
 
         *sessionid = m->audit->sessionid;
         return 0;
 }
 
 int sd_bus_message_get_audit_loginuid(sd_bus_message *m, uid_t *uid) {
-        if (!m)
-                return -EINVAL;
-        if (!uid)
-                return -EINVAL;
-        if (!m->audit)
-                return -ESRCH;
+        assert_return(m, -EINVAL);
+        assert_return(uid, -EINVAL);
+        assert_return(m->audit, -ESRCH);
 
         *uid = m->audit->loginuid;
         return 0;
@@ -1122,12 +1029,9 @@ int sd_bus_message_get_audit_loginuid(sd_bus_message *m, uid_t *uid) {
 int sd_bus_message_has_effective_cap(sd_bus_message *m, int capability) {
         unsigned sz;
 
-        if (!m)
-                return -EINVAL;
-        if (capability < 0)
-                return -EINVAL;
-        if (!m->capability)
-                return -ESRCH;
+        assert_return(m, -EINVAL);
+        assert_return(capability < 0, -EINVAL);
+        assert_return(!m->capability, -ESRCH);
 
         sz = m->capability_size / 4;
         if ((unsigned) capability >= sz*8)
@@ -1137,8 +1041,7 @@ int sd_bus_message_has_effective_cap(sd_bus_message *m, int capability) {
 }
 
 int sd_bus_message_is_signal(sd_bus_message *m, const char *interface, const char *member) {
-        if (!m)
-                return -EINVAL;
+        assert_return(m, -EINVAL);
 
         if (m->header->type != SD_BUS_MESSAGE_SIGNAL)
                 return 0;
@@ -1153,8 +1056,7 @@ int sd_bus_message_is_signal(sd_bus_message *m, const char *interface, const cha
 }
 
 int sd_bus_message_is_method_call(sd_bus_message *m, const char *interface, const char *member) {
-        if (!m)
-                return -EINVAL;
+        assert_return(m, -EINVAL);
 
         if (m->header->type != SD_BUS_MESSAGE_METHOD_CALL)
                 return 0;
@@ -1169,8 +1071,7 @@ int sd_bus_message_is_method_call(sd_bus_message *m, const char *interface, cons
 }
 
 int sd_bus_message_is_method_error(sd_bus_message *m, const char *name) {
-        if (!m)
-                return -EINVAL;
+        assert_return(m, -EINVAL);
 
         if (m->header->type != SD_BUS_MESSAGE_METHOD_ERROR)
                 return 0;
@@ -1182,12 +1083,9 @@ int sd_bus_message_is_method_error(sd_bus_message *m, const char *name) {
 }
 
 int sd_bus_message_set_no_reply(sd_bus_message *m, int b) {
-        if (!m)
-                return -EINVAL;
-        if (m->sealed)
-                return -EPERM;
-        if (m->header->type != SD_BUS_MESSAGE_METHOD_CALL)
-                return -EPERM;
+        assert_return(m, -EINVAL);
+        assert_return(!m->sealed, -EPERM);
+        assert_return(m->header->type == SD_BUS_MESSAGE_METHOD_CALL, -EPERM);
 
         if (b)
                 m->header->flags |= SD_BUS_MESSAGE_NO_REPLY_EXPECTED;
@@ -1419,16 +1317,11 @@ int message_append_basic(sd_bus_message *m, char type, const void *p, const void
         uint32_t fdi = 0;
         int r;
 
-        if (!m)
-                return -EINVAL;
-        if (!p)
-                return -EINVAL;
-        if (m->sealed)
-                return -EPERM;
-        if (!bus_type_is_basic(type))
-                return -EINVAL;
-        if (m->poisoned)
-                return -ESTALE;
+        assert_return(m, -EINVAL);
+        assert_return(p, -EINVAL);
+        assert_return(!m->sealed, -EPERM);
+        assert_return(bus_type_is_basic(type), -EINVAL);
+        assert_return(!m->poisoned, -ESTALE);
 
         c = message_get_container(m);
 
@@ -1454,14 +1347,29 @@ int message_append_basic(sd_bus_message *m, char type, const void *p, const void
         switch (type) {
 
         case SD_BUS_TYPE_STRING:
+                /* To make things easy we'll serialize a NULL string
+                 * into the empty string */
+                p = strempty(p);
+
+                /* Fall through... */
         case SD_BUS_TYPE_OBJECT_PATH:
 
+                if (!p) {
+                        r = -EINVAL;
+                        goto fail;
+                }
+
                 align = 4;
                 sz = 4 + strlen(p) + 1;
                 break;
 
         case SD_BUS_TYPE_SIGNATURE:
 
+                if (!p) {
+                        r = -EINVAL;
+                        goto fail;
+                }
+
                 align = 1;
                 sz = 1 + strlen(p) + 1;
                 break;
@@ -1574,14 +1482,10 @@ int sd_bus_message_append_string_space(sd_bus_message *m, size_t size, char **s)
         struct bus_container *c;
         void *a;
 
-        if (!m)
-                return -EINVAL;
-        if (!s)
-                return -EINVAL;
-        if (m->sealed)
-                return -EPERM;
-        if (m->poisoned)
-                return -ESTALE;
+        assert_return(m, -EINVAL);
+        assert_return(s, -EINVAL);
+        assert_return(!m->sealed, -EPERM);
+        assert_return(!m->poisoned, -ESTALE);
 
         c = message_get_container(m);
 
@@ -1847,14 +1751,10 @@ int sd_bus_message_open_container(
         size_t before;
         int r;
 
-        if (!m)
-                return -EINVAL;
-        if (m->sealed)
-                return -EPERM;
-        if (!contents)
-                return -EINVAL;
-        if (m->poisoned)
-                return -ESTALE;
+        assert_return(m, -EINVAL);
+        assert_return(!m->sealed, -EPERM);
+        assert_return(contents, -EINVAL);
+        assert_return(!m->poisoned, -ESTALE);
 
         /* Make sure we have space for one more container */
         w = realloc(m->containers, sizeof(struct bus_container) * (m->n_containers + 1));
@@ -1909,14 +1809,10 @@ int sd_bus_message_open_container(
 int sd_bus_message_close_container(sd_bus_message *m) {
         struct bus_container *c;
 
-        if (!m)
-                return -EINVAL;
-        if (m->sealed)
-                return -EPERM;
-        if (m->n_containers <= 0)
-                return -EINVAL;
-        if (m->poisoned)
-                return -ESTALE;
+        assert_return(m, -EINVAL);
+        assert_return(!m->sealed, -EPERM);
+        assert_return(m->n_containers > 0, -EINVAL);
+        assert_return(!m->poisoned, -ESTALE);
 
         c = message_get_container(m);
         if (c->enclosing != SD_BUS_TYPE_ARRAY)
@@ -2169,14 +2065,10 @@ int sd_bus_message_append(sd_bus_message *m, const char *types, ...) {
         va_list ap;
         int r;
 
-        if (!m)
-                return -EINVAL;
-        if (m->sealed)
-                return -EPERM;
-        if (m->poisoned)
-                return -ESTALE;
-        if (!types)
-                return 0;
+        assert_return(m, -EINVAL);
+        assert_return(types, -EINVAL);
+        assert_return(!m->sealed, -EPERM);
+        assert_return(!m->poisoned, -ESTALE);
 
         va_start(ap, types);
         r = bus_message_append_ap(m, types, ap);
@@ -2190,16 +2082,11 @@ int sd_bus_message_append_array_space(sd_bus_message *m, char type, size_t size,
         void *a;
         int r;
 
-        if (!m)
-                return -EINVAL;
-        if (m->sealed)
-                return -EPERM;
-        if (!bus_type_is_trivial(type))
-                return -EINVAL;
-        if (!ptr && size > 0)
-                return -EINVAL;
-        if (m->poisoned)
-                return -ESTALE;
+        assert_return(m, -EINVAL);
+        assert_return(!m->sealed, -EPERM);
+        assert_return(bus_type_is_trivial(type), -EINVAL);
+        assert_return(ptr || size == 0, -EINVAL);
+        assert_return(!m->poisoned, -ESTALE);
 
         align = bus_type_get_alignment(type);
         sz = bus_type_get_size(type);
@@ -2230,8 +2117,11 @@ int sd_bus_message_append_array(sd_bus_message *m, char type, const void *ptr, s
         int r;
         void *p;
 
-        if (!ptr && size > 0)
-                return -EINVAL;
+        assert_return(m, -EINVAL);
+        assert_return(!m->sealed, -EPERM);
+        assert_return(bus_type_is_trivial(type), -EINVAL);
+        assert_return(ptr || size == 0, -EINVAL);
+        assert_return(!m->poisoned, -ESTALE);
 
         r = sd_bus_message_append_array_space(m, type, size, &p);
         if (r < 0)
@@ -2491,6 +2381,15 @@ static int buffer_peek(const void *p, uint32_t sz, size_t *rindex, size_t align,
         return 1;
 }
 
+static bool message_end_of_signature(sd_bus_message *m) {
+        struct bus_container *c;
+
+        assert(m);
+
+        c = message_get_container(m);
+        return !c->signature || c->signature[c->index] == 0;
+}
+
 static bool message_end_of_array(sd_bus_message *m, size_t index) {
         struct bus_container *c;
 
@@ -2503,6 +2402,22 @@ static bool message_end_of_array(sd_bus_message *m, size_t index) {
         return index >= c->begin + BUS_MESSAGE_BSWAP32(m, *c->array_size);
 }
 
+int sd_bus_message_at_end(sd_bus_message *m, int complete) {
+        assert_return(m, -EINVAL);
+        assert_return(m->sealed, -EPERM);
+
+        if (complete && m->n_containers > 0)
+                return false;
+
+        if (message_end_of_signature(m))
+                return true;
+
+        if (message_end_of_array(m, m->rindex))
+                return true;
+
+        return false;
+}
+
 static struct bus_body_part* find_part(sd_bus_message *m, size_t index, size_t sz, void **p) {
         struct bus_body_part *part;
         size_t begin;
@@ -2642,26 +2557,20 @@ static bool validate_object_path(const char *s, size_t l) {
 
 int sd_bus_message_read_basic(sd_bus_message *m, char type, void *p) {
         struct bus_container *c;
-        int r;
         void *q;
+        int r;
 
-        if (!m)
-                return -EINVAL;
-        if (!m->sealed)
-                return -EPERM;
-        if (!bus_type_is_basic(type))
-                return -EINVAL;
-        if (!p)
-                return -EINVAL;
-
-        c = message_get_container(m);
+        assert_return(m, -EINVAL);
+        assert_return(m->sealed, -EPERM);
+        assert_return(bus_type_is_basic(type), -EINVAL);
 
-        if (!c->signature || c->signature[c->index] == 0)
+        if (message_end_of_signature(m))
                 return -ENXIO;
 
         if (message_end_of_array(m, m->rindex))
                 return 0;
 
+        c = message_get_container(m);
         if (c->signature[c->index] != type)
                 return -ENXIO;
 
@@ -2693,7 +2602,9 @@ int sd_bus_message_read_basic(sd_bus_message *m, char type, void *p) {
                 }
 
                 m->rindex = rindex;
-                *(const char**) p = q;
+                if (p)
+                        *(const char**) p = q;
+
                 break;
         }
 
@@ -2717,7 +2628,9 @@ int sd_bus_message_read_basic(sd_bus_message *m, char type, void *p) {
                         return -EBADMSG;
 
                 m->rindex = rindex;
-                *(const char**) p = q;
+
+                if (p)
+                        *(const char**) p = q;
                 break;
         }
 
@@ -2737,27 +2650,32 @@ int sd_bus_message_read_basic(sd_bus_message *m, char type, void *p) {
                 switch (type) {
 
                 case SD_BUS_TYPE_BYTE:
-                        *(uint8_t*) p = *(uint8_t*) q;
+                        if (p)
+                                *(uint8_t*) p = *(uint8_t*) q;
                         break;
 
                 case SD_BUS_TYPE_BOOLEAN:
-                        *(unsigned*) p = !!*(uint32_t*) q;
+                        if (p)
+                                *(unsigned*) p = !!*(uint32_t*) q;
                         break;
 
                 case SD_BUS_TYPE_INT16:
                 case SD_BUS_TYPE_UINT16:
-                        *(uint16_t*) p = BUS_MESSAGE_BSWAP16(m, *(uint16_t*) q);
+                        if (p)
+                                *(uint16_t*) p = BUS_MESSAGE_BSWAP16(m, *(uint16_t*) q);
                         break;
 
                 case SD_BUS_TYPE_INT32:
                 case SD_BUS_TYPE_UINT32:
-                        *(uint32_t*) p = BUS_MESSAGE_BSWAP32(m, *(uint32_t*) q);
+                        if (p)
+                                *(uint32_t*) p = BUS_MESSAGE_BSWAP32(m, *(uint32_t*) q);
                         break;
 
                 case SD_BUS_TYPE_INT64:
                 case SD_BUS_TYPE_UINT64:
                 case SD_BUS_TYPE_DOUBLE:
-                        *(uint64_t*) p = BUS_MESSAGE_BSWAP64(m, *(uint64_t*) q);
+                        if (p)
+                                *(uint64_t*) p = BUS_MESSAGE_BSWAP64(m, *(uint64_t*) q);
                         break;
 
                 case SD_BUS_TYPE_UNIX_FD: {
@@ -2767,7 +2685,8 @@ int sd_bus_message_read_basic(sd_bus_message *m, char type, void *p) {
                         if (j >= m->n_fds)
                                 return -EBADMSG;
 
-                        *(int*) p = m->fds[j];
+                        if (p)
+                                *(int*) p = m->fds[j];
                         break;
                 }
 
@@ -2974,12 +2893,28 @@ int sd_bus_message_enter_container(sd_bus_message *m, char type, const char *con
         size_t before;
         int r;
 
-        if (!m)
-                return -EINVAL;
-        if (!m->sealed)
-                return -EPERM;
-        if (!contents)
-                return -EINVAL;
+        assert_return(m, -EINVAL);
+        assert_return(m->sealed, -EPERM);
+        assert_return(type != 0 || !contents, -EINVAL);
+
+        if (type == 0 || !contents) {
+                const char *cc;
+                char tt;
+
+                /* Allow entering into anonymous containers */
+                r = sd_bus_message_peek_type(m, &tt, &cc);
+                if (r <= 0)
+                        return r;
+
+                if (type != 0 && type != tt)
+                        return -ENXIO;
+
+                if (contents && !streq(contents, cc))
+                        return -ENXIO;
+
+                type = tt;
+                contents = cc;
+        }
 
         /*
          * We enforce a global limit on container depth, that is much
@@ -3005,14 +2940,14 @@ int sd_bus_message_enter_container(sd_bus_message *m, char type, const char *con
                 return -ENOMEM;
         m->containers = w;
 
-        c = message_get_container(m);
-
-        if (!c->signature || c->signature[c->index] == 0)
+        if (message_end_of_signature(m))
                 return -ENXIO;
 
         if (message_end_of_array(m, m->rindex))
                 return 0;
 
+        c = message_get_container(m);
+
         signature = strdup(contents);
         if (!signature)
                 return -ENOMEM;
@@ -3051,12 +2986,9 @@ int sd_bus_message_enter_container(sd_bus_message *m, char type, const char *con
 int sd_bus_message_exit_container(sd_bus_message *m) {
         struct bus_container *c;
 
-        if (!m)
-                return -EINVAL;
-        if (!m->sealed)
-                return -EPERM;
-        if (m->n_containers <= 0)
-                return -EINVAL;
+        assert_return(m, -EINVAL);
+        assert_return(m->sealed, -EPERM);
+        assert_return(m->n_containers > 0, -EINVAL);
 
         c = message_get_container(m);
         if (c->enclosing == SD_BUS_TYPE_ARRAY) {
@@ -3106,14 +3038,14 @@ int sd_bus_message_peek_type(sd_bus_message *m, char *type, const char **content
         assert_return(m, -EINVAL);
         assert_return(m->sealed, -EPERM);
 
-        c = message_get_container(m);
-
-        if (!c->signature || c->signature[c->index] == 0)
+        if (message_end_of_signature(m))
                 goto eof;
 
         if (message_end_of_array(m, m->rindex))
                 goto eof;
 
+        c = message_get_container(m);
+
         if (bus_type_is_basic(c->signature[c->index])) {
                 if (contents)
                         *contents = NULL;
@@ -3213,7 +3145,7 @@ int sd_bus_message_peek_type(sd_bus_message *m, char *type, const char **content
 
 eof:
         if (type)
-                *type = c->enclosing;
+                *type = 0;
         if (contents)
                 *contents = NULL;
         return 0;
@@ -3222,10 +3154,8 @@ eof:
 int sd_bus_message_rewind(sd_bus_message *m, int complete) {
         struct bus_container *c;
 
-        if (!m)
-                return -EINVAL;
-        if (!m->sealed)
-                return -EPERM;
+        assert_return(m, -EINVAL);
+        assert_return(m->sealed, -EPERM);
 
         if (complete) {
                 message_reset_containers(m);
@@ -3316,7 +3246,6 @@ static int message_read_ap(
                         r = sd_bus_message_read_basic(m, *t, p);
                         if (r < 0)
                                 return r;
-
                         if (r == 0) {
                                 if (n_loop <= 1)
                                         return 0;
@@ -3445,12 +3374,9 @@ int sd_bus_message_read(sd_bus_message *m, const char *types, ...) {
         va_list ap;
         int r;
 
-        if (!m)
-                return -EINVAL;
-        if (!m->sealed)
-                return -EPERM;
-        if (!types)
-                return -EINVAL;
+        assert_return(m, -EINVAL);
+        assert_return(m->sealed, -EPERM);
+        assert_return(types, -EINVAL);
 
         va_start(ap, types);
         r = message_read_ap(m, types, ap);
@@ -3459,6 +3385,148 @@ int sd_bus_message_read(sd_bus_message *m, const char *types, ...) {
         return r;
 }
 
+int sd_bus_message_skip(sd_bus_message *m, const char *types) {
+        int r;
+
+        assert_return(m, -EINVAL);
+        assert_return(m->sealed, -EPERM);
+        assert_return(types, -EINVAL);
+
+        if (isempty(types))
+                return 0;
+
+        switch (*types) {
+
+        case SD_BUS_TYPE_BYTE:
+        case SD_BUS_TYPE_BOOLEAN:
+        case SD_BUS_TYPE_INT16:
+        case SD_BUS_TYPE_UINT16:
+        case SD_BUS_TYPE_INT32:
+        case SD_BUS_TYPE_UINT32:
+        case SD_BUS_TYPE_INT64:
+        case SD_BUS_TYPE_UINT64:
+        case SD_BUS_TYPE_DOUBLE:
+        case SD_BUS_TYPE_STRING:
+        case SD_BUS_TYPE_OBJECT_PATH:
+        case SD_BUS_TYPE_SIGNATURE:
+        case SD_BUS_TYPE_UNIX_FD:
+
+                r = sd_bus_message_read_basic(m, *types, NULL);
+                if (r <= 0)
+                        return r;
+
+                r = sd_bus_message_skip(m, types + 1);
+                if (r < 0)
+                        return r;
+
+                return 1;
+
+        case SD_BUS_TYPE_ARRAY: {
+                size_t k;
+
+                r = signature_element_length(types + 1, &k);
+                if (r < 0)
+                        return r;
+
+                {
+                        char s[k+1];
+                        memcpy(s, types+1, k);
+                        s[k] = 0;
+
+                        r = sd_bus_message_enter_container(m, SD_BUS_TYPE_ARRAY, s);
+                        if (r <= 0)
+                                return r;
+
+                        for (;;) {
+                                r = sd_bus_message_skip(m, s);
+                                if (r < 0)
+                                        return r;
+                                if (r == 0)
+                                        break;
+                        }
+
+                        r = sd_bus_message_exit_container(m);
+                        if (r < 0)
+                                return r;
+                }
+
+                r = sd_bus_message_skip(m, types + 1 + k);
+                if (r < 0)
+                        return r;
+
+                return 1;
+        }
+
+        case SD_BUS_TYPE_VARIANT: {
+                const char *contents;
+                char x;
+
+                r = sd_bus_message_peek_type(m, &x, &contents);
+                if (r <= 0)
+                        return r;
+
+                if (x != SD_BUS_TYPE_VARIANT)
+                        return -ENXIO;
+
+                r = sd_bus_message_enter_container(m, SD_BUS_TYPE_VARIANT, contents);
+                if (r <= 0)
+                        return r;
+
+                r = sd_bus_message_skip(m, contents);
+                if (r < 0)
+                        return r;
+                assert(r != 0);
+
+                r = sd_bus_message_exit_container(m);
+                if (r < 0)
+                        return r;
+
+                r = sd_bus_message_skip(m, types + 1);
+                if (r < 0)
+                        return r;
+
+                return 1;
+        }
+
+        case SD_BUS_TYPE_STRUCT_BEGIN:
+        case SD_BUS_TYPE_DICT_ENTRY_BEGIN: {
+                size_t k;
+
+                r = signature_element_length(types, &k);
+                if (r < 0)
+                        return r;
+
+                {
+                        char s[k-1];
+                        memcpy(s, types+1, k-2);
+                        s[k-2] = 0;
+
+                        r = sd_bus_message_enter_container(m, *types == SD_BUS_TYPE_STRUCT_BEGIN ? SD_BUS_TYPE_STRUCT : SD_BUS_TYPE_DICT_ENTRY, s);
+                        if (r <= 0)
+                                return r;
+
+                        r = sd_bus_message_skip(m, s);
+                        if (r < 0)
+                                return r;
+                        assert(r != 0);
+
+                        r = sd_bus_message_exit_container(m);
+                        if (r < 0)
+                                return r;
+                }
+
+                r = sd_bus_message_skip(m, types + k);
+                if (r < 0)
+                        return r;
+
+                return 1;
+        }
+
+        default:
+                return -EINVAL;
+        }
+}
+
 int sd_bus_message_read_array(sd_bus_message *m, char type, const void **ptr, size_t *size) {
         struct bus_container *c;
         void *p;
@@ -3466,18 +3534,12 @@ int sd_bus_message_read_array(sd_bus_message *m, char type, const void **ptr, si
         ssize_t align;
         int r;
 
-        if (!m)
-                return -EINVAL;
-        if (!m->sealed)
-                return -EPERM;
-        if (!bus_type_is_trivial(type))
-                return -EINVAL;
-        if (!ptr)
-                return -EINVAL;
-        if (!size)
-                return -EINVAL;
-        if (BUS_MESSAGE_NEED_BSWAP(m))
-                return -ENOTSUP;
+        assert_return(m, -EINVAL);
+        assert_return(m->sealed, -EPERM);
+        assert_return(bus_type_is_trivial(type), -EINVAL);
+        assert_return(ptr, -EINVAL);
+        assert_return(size, -EINVAL);
+        assert_return(!BUS_MESSAGE_NEED_BSWAP(m), -ENOTSUP);
 
         align = bus_type_get_alignment(type);
         if (align < 0)
@@ -4004,14 +4066,10 @@ int bus_message_seal(sd_bus_message *m, uint64_t serial) {
 }
 
 int sd_bus_message_set_destination(sd_bus_message *m, const char *destination) {
-        if (!m)
-                return -EINVAL;
-        if (!destination)
-                return -EINVAL;
-        if (m->sealed)
-                return -EPERM;
-        if (m->destination)
-                return -EEXIST;
+        assert_return(m, -EINVAL);
+        assert_return(destination, -EINVAL);
+        assert_return(!m->sealed, -EPERM);
+        assert_return(!m->destination, -EEXIST);
 
         return message_append_field_string(m, SD_BUS_MESSAGE_HEADER_DESTINATION, SD_BUS_TYPE_STRING, destination, &m->destination);
 }
@@ -4047,8 +4105,6 @@ int bus_message_dump(sd_bus_message *m, FILE *f, bool with_header) {
                         "\tsender=%s\n"
                         "\tsignature=%s\n"
                         "\treply_serial=%u\n"
-                        "\terror.name=%s\n"
-                        "\terror.message=%s\n"
                         "\tsealed=%s\n"
                         "\tn_body_parts=%u\n",
                         m,
@@ -4067,11 +4123,16 @@ int bus_message_dump(sd_bus_message *m, FILE *f, bool with_header) {
                         strna(m->sender),
                         strna(m->root_container.signature),
                         m->reply_serial,
-                        strna(m->error.name),
-                        strna(m->error.message),
                         yes_no(m->sealed),
                         m->n_body_parts);
 
+                if (sd_bus_error_is_set(&m->error))
+                        fprintf(f,
+                                "\terror.name=%s\n"
+                                "\terror.message=%s\n",
+                                strna(m->error.name),
+                                strna(m->error.message));
+
                 if (m->pid != 0)
                         fprintf(f, "\tpid=%lu\n", (unsigned long) m->pid);
                 if (m->tid != 0)
@@ -4113,7 +4174,9 @@ int bus_message_dump(sd_bus_message *m, FILE *f, bool with_header) {
                 if (sd_bus_message_get_audit_sessionid(m, &audit_sessionid) >= 0)
                         fprintf(f, "\taudit_sessionid=%lu\n", (unsigned long) audit_sessionid);
 
-                fprintf(f, "\tCAP_KILL=%i\n", sd_bus_message_has_effective_cap(m, 5));
+                r = sd_bus_message_has_effective_cap(m, 5);
+                if (r >= 0)
+                        fprintf(f, "\tCAP_KILL=%s\n", yes_no(r));
 
                 if (sd_bus_message_get_cmdline(m, &cmdline) >= 0) {
                         char **c;
@@ -4319,7 +4382,7 @@ int bus_message_read_strv_extend(sd_bus_message *m, char ***l) {
         assert(l);
 
         r = sd_bus_message_enter_container(m, 'a', "s");
-        if (r < 0)
+        if (r <= 0)
                 return r;
 
         for (;;) {
@@ -4343,6 +4406,24 @@ int bus_message_read_strv_extend(sd_bus_message *m, char ***l) {
         return 0;
 }
 
+int sd_bus_message_read_strv(sd_bus_message *m, char ***l) {
+        char **strv = NULL;
+        int r;
+
+        assert_return(m, -EINVAL);
+        assert_return(m->sealed, -EPERM);
+        assert_return(l, -EINVAL);
+
+        r = bus_message_read_strv_extend(m, &strv);
+        if (r <= 0) {
+                strv_free(strv);
+                return r;
+        }
+
+        *l = strv;
+        return 1;
+}
+
 const char* bus_message_get_arg(sd_bus_message *m, unsigned i) {
         int r;
         const char *t = NULL;
@@ -4420,8 +4501,7 @@ int sd_bus_message_get_errno(sd_bus_message *m) {
 const char* sd_bus_message_get_signature(sd_bus_message *m, int complete) {
         struct bus_container *c;
 
-        if (!m)
-                return NULL;
+        assert_return(m, NULL);
 
         c = complete ? &m->root_container : message_get_container(m);
         return c->signature ?: "";