bus: internalize a lot of protocol definitions

We shouldn export what isn't necessary or useful to clients, so let's
add the protocol definitions we only need internally into a private
header.

12 files changed, 208 insertions, 179 deletions

diff --git a/Makefile.am b/Makefile.am
index 7c6241440c..acf511bc4f 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -2004,7 +2004,8 @@ libsystemd_bus_la_SOURCES = \
 	src/libsystemd-bus/bus-util.h \
 	src/libsystemd-bus/sd-utf8.c \
 	src/libsystemd-bus/sd-event.c \
-	src/libsystemd-bus/event-util.h
+	src/libsystemd-bus/event-util.h \
+	src/libsystemd-bus/bus-protocol.h
 
 libsystemd_bus_la_LIBADD = \
 	libsystemd-id128-internal.la \
diff --git a/src/libsystemd-bus/bus-control.c b/src/libsystemd-bus/bus-control.c
index de5c20e3f8..ed10f5a683 100644
--- a/src/libsystemd-bus/bus-control.c
+++ b/src/libsystemd-bus/bus-control.c
@@ -104,11 +104,11 @@ static int bus_request_name_dbus1(sd_bus *bus, const char *name, unsigned flags)
         if (r < 0)
                 return r;
 
-        if (ret == SD_BUS_NAME_ALREADY_OWNER)
+        if (ret == BUS_NAME_ALREADY_OWNER)
                 return -EALREADY;
-        else if (ret == SD_BUS_NAME_EXISTS)
+        else if (ret == BUS_NAME_EXISTS)
                 return -EEXIST;
-        else if (ret == SD_BUS_NAME_IN_QUEUE)
+        else if (ret == BUS_NAME_IN_QUEUE)
                 return 0;
         else
                 return -EIO;
@@ -177,11 +177,11 @@ static int bus_release_name_dbus1(sd_bus *bus, const char *name) {
         r = sd_bus_message_read(reply, "u", &ret);
         if (r < 0)
                 return r;
-        if (ret == SD_BUS_NAME_NON_EXISTENT)
+        if (ret == BUS_NAME_NON_EXISTENT)
                 return -ENOENT;
-        if (ret == SD_BUS_NAME_NOT_OWNER)
+        if (ret == BUS_NAME_NOT_OWNER)
                 return -EADDRNOTAVAIL;
-        if (ret == SD_BUS_NAME_RELEASED)
+        if (ret == BUS_NAME_RELEASED)
                 return 0;
 
         return -EINVAL;
diff --git a/src/libsystemd-bus/bus-convenience.c b/src/libsystemd-bus/bus-convenience.c
index d4c1929ff7..3964960fab 100644
--- a/src/libsystemd-bus/bus-convenience.c
+++ b/src/libsystemd-bus/bus-convenience.c
@@ -103,7 +103,7 @@ _public_ int sd_bus_reply_method_return(
         assert_return(call->bus && BUS_IS_OPEN(call->bus->state), -ENOTCONN);
         assert_return(!bus_pid_changed(call->bus), -ECHILD);
 
-        if (call->header->flags & SD_BUS_MESSAGE_NO_REPLY_EXPECTED)
+        if (call->header->flags & BUS_MESSAGE_NO_REPLY_EXPECTED)
                 return 0;
 
         r = sd_bus_message_new_method_return(call, &m);
@@ -137,7 +137,7 @@ _public_ int sd_bus_reply_method_error(
         assert_return(call->bus && BUS_IS_OPEN(call->bus->state), -ENOTCONN);
         assert_return(!bus_pid_changed(call->bus), -ECHILD);
 
-        if (call->header->flags & SD_BUS_MESSAGE_NO_REPLY_EXPECTED)
+        if (call->header->flags & BUS_MESSAGE_NO_REPLY_EXPECTED)
                 return 0;
 
         r = sd_bus_message_new_method_error(call, e, &m);
@@ -162,7 +162,7 @@ _public_ int sd_bus_reply_method_errorf(
         assert_return(call->bus && BUS_IS_OPEN(call->bus->state), -ENOTCONN);
         assert_return(!bus_pid_changed(call->bus), -ECHILD);
 
-        if (call->header->flags & SD_BUS_MESSAGE_NO_REPLY_EXPECTED)
+        if (call->header->flags & BUS_MESSAGE_NO_REPLY_EXPECTED)
                 return 0;
 
         va_start(ap, format);
@@ -185,7 +185,7 @@ _public_ int sd_bus_reply_method_errno(
         assert_return(call->bus && BUS_IS_OPEN(call->bus->state), -ENOTCONN);
         assert_return(!bus_pid_changed(call->bus), -ECHILD);
 
-        if (call->header->flags & SD_BUS_MESSAGE_NO_REPLY_EXPECTED)
+        if (call->header->flags & BUS_MESSAGE_NO_REPLY_EXPECTED)
                 return 0;
 
         if (sd_bus_error_is_set(p))
@@ -211,7 +211,7 @@ _public_ int sd_bus_reply_method_errnof(
         assert_return(call->bus && BUS_IS_OPEN(call->bus->state), -ENOTCONN);
         assert_return(!bus_pid_changed(call->bus), -ECHILD);
 
-        if (call->header->flags & SD_BUS_MESSAGE_NO_REPLY_EXPECTED)
+        if (call->header->flags & BUS_MESSAGE_NO_REPLY_EXPECTED)
                 return 0;
 
         va_start(ap, format);
diff --git a/src/libsystemd-bus/bus-introspect.c b/src/libsystemd-bus/bus-introspect.c
index 1965364cd0..115b3ceae8 100644
--- a/src/libsystemd-bus/bus-introspect.c
+++ b/src/libsystemd-bus/bus-introspect.c
@@ -24,6 +24,7 @@
 #include "bus-introspect.h"
 #include "bus-signature.h"
 #include "bus-internal.h"
+#include "bus-protocol.h"
 
 int introspect_begin(struct introspect *i) {
         assert(i);
@@ -34,7 +35,7 @@ int introspect_begin(struct introspect *i) {
         if (!i->f)
                 return -ENOMEM;
 
-        fputs(SD_BUS_INTROSPECT_DOCTYPE
+        fputs(BUS_INTROSPECT_DOCTYPE
               "<node>\n", i->f);
 
         return 0;
@@ -43,12 +44,12 @@ int introspect_begin(struct introspect *i) {
 int introspect_write_default_interfaces(struct introspect *i, bool object_manager) {
         assert(i);
 
-        fputs(SD_BUS_INTROSPECT_INTERFACE_PEER
-              SD_BUS_INTROSPECT_INTERFACE_INTROSPECTABLE
-              SD_BUS_INTROSPECT_INTERFACE_PROPERTIES, i->f);
+        fputs(BUS_INTROSPECT_INTERFACE_PEER
+              BUS_INTROSPECT_INTERFACE_INTROSPECTABLE
+              BUS_INTROSPECT_INTERFACE_PROPERTIES, i->f);
 
         if (object_manager)
-                fputs(SD_BUS_INTROSPECT_INTERFACE_OBJECT_MANAGER, i->f);
+                fputs(BUS_INTROSPECT_INTERFACE_OBJECT_MANAGER, i->f);
 
         return 0;
 }
diff --git a/src/libsystemd-bus/bus-kernel.c b/src/libsystemd-bus/bus-kernel.c
index ca36eb8638..b85a10dd38 100644
--- a/src/libsystemd-bus/bus-kernel.c
+++ b/src/libsystemd-bus/bus-kernel.c
@@ -248,8 +248,8 @@ static int bus_message_setup_kmsg(sd_bus *b, sd_bus_message *m) {
         memset(m->kdbus, 0, sz);
 
         m->kdbus->flags =
-                ((m->header->flags & SD_BUS_MESSAGE_NO_REPLY_EXPECTED) ? 0 : KDBUS_MSG_FLAGS_EXPECT_REPLY) |
-                ((m->header->flags & SD_BUS_MESSAGE_NO_AUTO_START) ? KDBUS_MSG_FLAGS_NO_AUTO_START : 0);
+                ((m->header->flags & BUS_MESSAGE_NO_REPLY_EXPECTED) ? 0 : KDBUS_MSG_FLAGS_EXPECT_REPLY) |
+                ((m->header->flags & BUS_MESSAGE_NO_AUTO_START) ? KDBUS_MSG_FLAGS_NO_AUTO_START : 0);
         m->kdbus->dst_id =
                 well_known ? 0 :
                 m->destination ? unique : KDBUS_DST_ID_BROADCAST;
diff --git a/src/libsystemd-bus/bus-message.c b/src/libsystemd-bus/bus-message.c
index dc85694471..0cfbf5a65b 100644
--- a/src/libsystemd-bus/bus-message.c
+++ b/src/libsystemd-bus/bus-message.c
@@ -332,8 +332,8 @@ int bus_message_from_header(
         if (h->type == _SD_BUS_MESSAGE_TYPE_INVALID)
                 return -EBADMSG;
 
-        if (h->endian != SD_BUS_LITTLE_ENDIAN &&
-            h->endian != SD_BUS_BIG_ENDIAN)
+        if (h->endian != BUS_LITTLE_ENDIAN &&
+            h->endian != BUS_BIG_ENDIAN)
                 return -EBADMSG;
 
         a = ALIGN(sizeof(sd_bus_message)) + ALIGN(extra);
@@ -436,7 +436,7 @@ static sd_bus_message *message_new(sd_bus *bus, uint8_t type) {
 
         m->n_ref = 1;
         m->header = (struct bus_header*) ((uint8_t*) m + ALIGN(sizeof(struct sd_bus_message)));
-        m->header->endian = SD_BUS_NATIVE_ENDIAN;
+        m->header->endian = BUS_NATIVE_ENDIAN;
         m->header->type = type;
         m->header->version = bus ? bus->message_version : 1;
         m->allow_fds = !bus || bus->can_fds || (bus->state != BUS_HELLO && bus->state != BUS_RUNNING);
@@ -467,15 +467,15 @@ _public_ int sd_bus_message_new_signal(
         if (!t)
                 return -ENOMEM;
 
-        t->header->flags |= SD_BUS_MESSAGE_NO_REPLY_EXPECTED;
+        t->header->flags |= BUS_MESSAGE_NO_REPLY_EXPECTED;
 
-        r = message_append_field_string(t, SD_BUS_MESSAGE_HEADER_PATH, SD_BUS_TYPE_OBJECT_PATH, path, &t->path);
+        r = message_append_field_string(t, BUS_MESSAGE_HEADER_PATH, SD_BUS_TYPE_OBJECT_PATH, path, &t->path);
         if (r < 0)
                 goto fail;
-        r = message_append_field_string(t, SD_BUS_MESSAGE_HEADER_INTERFACE, SD_BUS_TYPE_STRING, interface, &t->interface);
+        r = message_append_field_string(t, BUS_MESSAGE_HEADER_INTERFACE, SD_BUS_TYPE_STRING, interface, &t->interface);
         if (r < 0)
                 goto fail;
-        r = message_append_field_string(t, SD_BUS_MESSAGE_HEADER_MEMBER, SD_BUS_TYPE_STRING, member, &t->member);
+        r = message_append_field_string(t, BUS_MESSAGE_HEADER_MEMBER, SD_BUS_TYPE_STRING, member, &t->member);
         if (r < 0)
                 goto fail;
 
@@ -509,21 +509,21 @@ _public_ int sd_bus_message_new_method_call(
         if (!t)
                 return -ENOMEM;
 
-        r = message_append_field_string(t, SD_BUS_MESSAGE_HEADER_PATH, SD_BUS_TYPE_OBJECT_PATH, path, &t->path);
+        r = message_append_field_string(t, BUS_MESSAGE_HEADER_PATH, SD_BUS_TYPE_OBJECT_PATH, path, &t->path);
         if (r < 0)
                 goto fail;
-        r = message_append_field_string(t, SD_BUS_MESSAGE_HEADER_MEMBER, SD_BUS_TYPE_STRING, member, &t->member);
+        r = message_append_field_string(t, BUS_MESSAGE_HEADER_MEMBER, SD_BUS_TYPE_STRING, member, &t->member);
         if (r < 0)
                 goto fail;
 
         if (interface) {
-                r = message_append_field_string(t, SD_BUS_MESSAGE_HEADER_INTERFACE, SD_BUS_TYPE_STRING, interface, &t->interface);
+                r = message_append_field_string(t, BUS_MESSAGE_HEADER_INTERFACE, SD_BUS_TYPE_STRING, interface, &t->interface);
                 if (r < 0)
                         goto fail;
         }
 
         if (destination) {
-                r = message_append_field_string(t, SD_BUS_MESSAGE_HEADER_DESTINATION, SD_BUS_TYPE_STRING, destination, &t->destination);
+                r = message_append_field_string(t, BUS_MESSAGE_HEADER_DESTINATION, SD_BUS_TYPE_STRING, destination, &t->destination);
                 if (r < 0)
                         goto fail;
         }
@@ -554,20 +554,20 @@ static int message_new_reply(
         if (!t)
                 return -ENOMEM;
 
-        t->header->flags |= SD_BUS_MESSAGE_NO_REPLY_EXPECTED;
+        t->header->flags |= BUS_MESSAGE_NO_REPLY_EXPECTED;
         t->reply_serial = BUS_MESSAGE_SERIAL(call);
 
-        r = message_append_field_uint32(t, SD_BUS_MESSAGE_HEADER_REPLY_SERIAL, t->reply_serial);
+        r = message_append_field_uint32(t, BUS_MESSAGE_HEADER_REPLY_SERIAL, t->reply_serial);
         if (r < 0)
                 goto fail;
 
         if (call->sender) {
-                r = message_append_field_string(t, SD_BUS_MESSAGE_HEADER_DESTINATION, SD_BUS_TYPE_STRING, call->sender, &t->destination);
+                r = message_append_field_string(t, BUS_MESSAGE_HEADER_DESTINATION, SD_BUS_TYPE_STRING, call->sender, &t->destination);
                 if (r < 0)
                         goto fail;
         }
 
-        t->dont_send = !!(call->header->flags & SD_BUS_MESSAGE_NO_REPLY_EXPECTED);
+        t->dont_send = !!(call->header->flags & BUS_MESSAGE_NO_REPLY_EXPECTED);
         t->enforced_reply_signature = call->enforced_reply_signature;
 
         *m = t;
@@ -600,7 +600,7 @@ _public_ int sd_bus_message_new_method_error(
         if (r < 0)
                 return r;
 
-        r = message_append_field_string(t, SD_BUS_MESSAGE_HEADER_ERROR_NAME, SD_BUS_TYPE_STRING, e->name, &t->error.name);
+        r = message_append_field_string(t, BUS_MESSAGE_HEADER_ERROR_NAME, SD_BUS_TYPE_STRING, e->name, &t->error.name);
         if (r < 0)
                 goto fail;
 
@@ -689,20 +689,20 @@ int bus_message_new_synthetic_error(
         if (!t)
                 return -ENOMEM;
 
-        t->header->flags |= SD_BUS_MESSAGE_NO_REPLY_EXPECTED;
+        t->header->flags |= BUS_MESSAGE_NO_REPLY_EXPECTED;
         t->reply_serial = serial;
 
-        r = message_append_field_uint32(t, SD_BUS_MESSAGE_HEADER_REPLY_SERIAL, t->reply_serial);
+        r = message_append_field_uint32(t, BUS_MESSAGE_HEADER_REPLY_SERIAL, t->reply_serial);
         if (r < 0)
                 goto fail;
 
         if (bus && bus->unique_name) {
-                r = message_append_field_string(t, SD_BUS_MESSAGE_HEADER_DESTINATION, SD_BUS_TYPE_STRING, bus->unique_name, &t->destination);
+                r = message_append_field_string(t, BUS_MESSAGE_HEADER_DESTINATION, SD_BUS_TYPE_STRING, bus->unique_name, &t->destination);
                 if (r < 0)
                         goto fail;
         }
 
-        r = message_append_field_string(t, SD_BUS_MESSAGE_HEADER_ERROR_NAME, SD_BUS_TYPE_STRING, e->name, &t->error.name);
+        r = message_append_field_string(t, BUS_MESSAGE_HEADER_ERROR_NAME, SD_BUS_TYPE_STRING, e->name, &t->error.name);
         if (r < 0)
                 goto fail;
 
@@ -772,13 +772,13 @@ _public_ int sd_bus_message_get_reply_serial(sd_bus_message *m, uint64_t *serial
 _public_ int sd_bus_message_get_no_reply(sd_bus_message *m) {
         assert_return(m, -EINVAL);
 
-        return m->header->type == SD_BUS_MESSAGE_METHOD_CALL ? !!(m->header->flags & SD_BUS_MESSAGE_NO_REPLY_EXPECTED) : 0;
+        return m->header->type == SD_BUS_MESSAGE_METHOD_CALL ? !!(m->header->flags & BUS_MESSAGE_NO_REPLY_EXPECTED) : 0;
 }
 
 _public_ int sd_bus_message_get_no_auto_start(sd_bus_message *m) {
         assert_return(m, -EINVAL);
 
-        return !!(m->header->flags & SD_BUS_MESSAGE_NO_AUTO_START);
+        return !!(m->header->flags & BUS_MESSAGE_NO_AUTO_START);
 }
 
 _public_ const char *sd_bus_message_get_path(sd_bus_message *m) {
@@ -897,9 +897,9 @@ _public_ int sd_bus_message_set_no_reply(sd_bus_message *m, int b) {
         assert_return(m->header->type == SD_BUS_MESSAGE_METHOD_CALL, -EPERM);
 
         if (b)
-                m->header->flags |= SD_BUS_MESSAGE_NO_REPLY_EXPECTED;
+                m->header->flags |= BUS_MESSAGE_NO_REPLY_EXPECTED;
         else
-                m->header->flags &= ~SD_BUS_MESSAGE_NO_REPLY_EXPECTED;
+                m->header->flags &= ~BUS_MESSAGE_NO_REPLY_EXPECTED;
 
         return 0;
 }
@@ -909,9 +909,9 @@ _public_ int sd_bus_message_set_no_auto_start(sd_bus_message *m, int b) {
         assert_return(!m->sealed, -EPERM);
 
         if (b)
-                m->header->flags |= SD_BUS_MESSAGE_NO_AUTO_START;
+                m->header->flags |= BUS_MESSAGE_NO_AUTO_START;
         else
-                m->header->flags &= ~SD_BUS_MESSAGE_NO_AUTO_START;
+                m->header->flags &= ~BUS_MESSAGE_NO_AUTO_START;
 
         return 0;
 }
@@ -3764,10 +3764,10 @@ int bus_message_parse_fields(sd_bus_message *m) {
                         return r;
 
                 switch (*header) {
-                case _SD_BUS_MESSAGE_HEADER_INVALID:
+                case _BUS_MESSAGE_HEADER_INVALID:
                         return -EBADMSG;
 
-                case SD_BUS_MESSAGE_HEADER_PATH:
+                case BUS_MESSAGE_HEADER_PATH:
 
                         if (m->path)
                                 return -EBADMSG;
@@ -3778,7 +3778,7 @@ int bus_message_parse_fields(sd_bus_message *m) {
                         r = message_peek_field_string(m, object_path_is_valid, &ri, &m->path);
                         break;
 
-                case SD_BUS_MESSAGE_HEADER_INTERFACE:
+                case BUS_MESSAGE_HEADER_INTERFACE:
 
                         if (m->interface)
                                 return -EBADMSG;
@@ -3789,7 +3789,7 @@ int bus_message_parse_fields(sd_bus_message *m) {
                         r = message_peek_field_string(m, interface_name_is_valid, &ri, &m->interface);
                         break;
 
-                case SD_BUS_MESSAGE_HEADER_MEMBER:
+                case BUS_MESSAGE_HEADER_MEMBER:
 
                         if (m->member)
                                 return -EBADMSG;
@@ -3800,7 +3800,7 @@ int bus_message_parse_fields(sd_bus_message *m) {
                         r = message_peek_field_string(m, member_name_is_valid, &ri, &m->member);
                         break;
 
-                case SD_BUS_MESSAGE_HEADER_ERROR_NAME:
+                case BUS_MESSAGE_HEADER_ERROR_NAME:
 
                         if (m->error.name)
                                 return -EBADMSG;
@@ -3814,7 +3814,7 @@ int bus_message_parse_fields(sd_bus_message *m) {
 
                         break;
 
-                case SD_BUS_MESSAGE_HEADER_DESTINATION:
+                case BUS_MESSAGE_HEADER_DESTINATION:
 
                         if (m->destination)
                                 return -EBADMSG;
@@ -3825,7 +3825,7 @@ int bus_message_parse_fields(sd_bus_message *m) {
                         r = message_peek_field_string(m, service_name_is_valid, &ri, &m->destination);
                         break;
 
-                case SD_BUS_MESSAGE_HEADER_SENDER:
+                case BUS_MESSAGE_HEADER_SENDER:
 
                         if (m->sender)
                                 return -EBADMSG;
@@ -3843,7 +3843,7 @@ int bus_message_parse_fields(sd_bus_message *m) {
                         break;
 
 
-                case SD_BUS_MESSAGE_HEADER_SIGNATURE: {
+                case BUS_MESSAGE_HEADER_SIGNATURE: {
                         const char *s;
                         char *c;
 
@@ -3866,7 +3866,7 @@ int bus_message_parse_fields(sd_bus_message *m) {
                         break;
                 }
 
-                case SD_BUS_MESSAGE_HEADER_REPLY_SERIAL:
+                case BUS_MESSAGE_HEADER_REPLY_SERIAL:
                         if (m->reply_serial != 0)
                                 return -EBADMSG;
 
@@ -3882,7 +3882,7 @@ int bus_message_parse_fields(sd_bus_message *m) {
 
                         break;
 
-                case SD_BUS_MESSAGE_HEADER_UNIX_FDS:
+                case BUS_MESSAGE_HEADER_UNIX_FDS:
                         if (unix_fds != 0)
                                 return -EBADMSG;
 
@@ -3972,13 +3972,13 @@ int bus_message_seal(sd_bus_message *m, uint64_t serial) {
 
         /* If there's a non-trivial signature set, then add it in here */
         if (!isempty(m->root_container.signature)) {
-                r = message_append_field_signature(m, SD_BUS_MESSAGE_HEADER_SIGNATURE, m->root_container.signature, NULL);
+                r = message_append_field_signature(m, BUS_MESSAGE_HEADER_SIGNATURE, m->root_container.signature, NULL);
                 if (r < 0)
                         return r;
         }
 
         if (m->n_fds > 0) {
-                r = message_append_field_uint32(m, SD_BUS_MESSAGE_HEADER_UNIX_FDS, m->n_fds);
+                r = message_append_field_uint32(m, BUS_MESSAGE_HEADER_UNIX_FDS, m->n_fds);
                 if (r < 0)
                         return r;
         }
@@ -4017,7 +4017,7 @@ _public_ int sd_bus_message_set_destination(sd_bus_message *m, const char *desti
         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);
+        return message_append_field_string(m, BUS_MESSAGE_HEADER_DESTINATION, SD_BUS_TYPE_STRING, destination, &m->destination);
 }
 
 int bus_message_get_blob(sd_bus_message *m, void **buffer, size_t *sz) {
@@ -4138,7 +4138,7 @@ bool bus_header_is_complete(struct bus_header *h, size_t size) {
                 return false;
 
         full = sizeof(struct bus_header) +
-                (h->endian == SD_BUS_NATIVE_ENDIAN ? h->fields_size : bswap_32(h->fields_size));
+                (h->endian == BUS_NATIVE_ENDIAN ? h->fields_size : bswap_32(h->fields_size));
 
         return size >= full;
 }
@@ -4149,10 +4149,10 @@ int bus_header_message_size(struct bus_header *h, size_t *sum) {
         assert(h);
         assert(sum);
 
-        if (h->endian == SD_BUS_NATIVE_ENDIAN) {
+        if (h->endian == BUS_NATIVE_ENDIAN) {
                 fs = h->fields_size;
                 bs = h->body_size;
-        } else if (h->endian == SD_BUS_REVERSE_ENDIAN) {
+        } else if (h->endian == BUS_REVERSE_ENDIAN) {
                 fs = bswap_32(h->fields_size);
                 bs = bswap_32(h->body_size);
         } else
diff --git a/src/libsystemd-bus/bus-message.h b/src/libsystemd-bus/bus-message.h
index 34dbc5d563..55956adf1d 100644
--- a/src/libsystemd-bus/bus-message.h
+++ b/src/libsystemd-bus/bus-message.h
@@ -30,6 +30,7 @@
 #include "kdbus.h"
 #include "time-util.h"
 #include "bus-creds.h"
+#include "bus-protocol.h"
 
 struct bus_container {
         char enclosing;
@@ -127,7 +128,7 @@ struct sd_bus_message {
         char destination_buffer[3 + DECIMAL_STR_MAX(uint64_t) + 1];
 };
 
-#define BUS_MESSAGE_NEED_BSWAP(m) ((m)->header->endian != SD_BUS_NATIVE_ENDIAN)
+#define BUS_MESSAGE_NEED_BSWAP(m) ((m)->header->endian != BUS_NATIVE_ENDIAN)
 
 static inline uint16_t BUS_MESSAGE_BSWAP16(sd_bus_message *m, uint16_t u) {
         return BUS_MESSAGE_NEED_BSWAP(m) ? bswap_16(u) : u;
diff --git a/src/libsystemd-bus/bus-protocol.h b/src/libsystemd-bus/bus-protocol.h
new file mode 100644
index 0000000000..982461bd9d
--- /dev/null
+++ b/src/libsystemd-bus/bus-protocol.h
@@ -0,0 +1,133 @@
+/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
+
+#pragma once
+
+/***
+  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/>.
+***/
+
+
+/* Endianness */
+
+enum {
+        _BUS_INVALID_ENDIAN = 0,
+        BUS_LITTLE_ENDIAN   = 'l',
+        BUS_BIG_ENDIAN      = 'B',
+#if __BYTE_ORDER == __BIG_ENDIAN
+        BUS_NATIVE_ENDIAN   = BUS_BIG_ENDIAN,
+        BUS_REVERSE_ENDIAN  = BUS_LITTLE_ENDIAN
+#else
+        BUS_NATIVE_ENDIAN   = BUS_LITTLE_ENDIAN,
+        BUS_REVERSE_ENDIAN  = BUS_BIG_ENDIAN
+#endif
+};
+
+/* Flags */
+
+enum {
+        BUS_MESSAGE_NO_REPLY_EXPECTED = 1,
+        BUS_MESSAGE_NO_AUTO_START = 2
+};
+
+/* Header fields */
+
+enum {
+        _BUS_MESSAGE_HEADER_INVALID = 0,
+        BUS_MESSAGE_HEADER_PATH,
+        BUS_MESSAGE_HEADER_INTERFACE,
+        BUS_MESSAGE_HEADER_MEMBER,
+        BUS_MESSAGE_HEADER_ERROR_NAME,
+        BUS_MESSAGE_HEADER_REPLY_SERIAL,
+        BUS_MESSAGE_HEADER_DESTINATION,
+        BUS_MESSAGE_HEADER_SENDER,
+        BUS_MESSAGE_HEADER_SIGNATURE,
+        BUS_MESSAGE_HEADER_UNIX_FDS,
+        _BUS_MESSAGE_HEADER_MAX
+};
+
+/* RequestName returns */
+enum  {
+        BUS_NAME_PRIMARY_OWNER = 1,
+        BUS_NAME_IN_QUEUE = 2,
+        BUS_NAME_EXISTS = 3,
+        BUS_NAME_ALREADY_OWNER = 4
+};
+
+/* ReleaseName returns */
+enum {
+        BUS_NAME_RELEASED = 1,
+        BUS_NAME_NON_EXISTENT = 2,
+        BUS_NAME_NOT_OWNER = 3,
+};
+
+#define BUS_INTROSPECT_DOCTYPE                                       \
+        "<!DOCTYPE node PUBLIC \"-//freedesktop//DTD D-BUS Object Introspection 1.0//EN\"\n" \
+        "\"http://www.freedesktop.org/standards/dbus/1.0/introspect.dtd\">\n"
+
+#define BUS_INTROSPECT_INTERFACE_PEER                                \
+        " <interface name=\"org.freedesktop.DBus.Peer\">\n"             \
+        "  <method name=\"Ping\"/>\n"                                   \
+        "  <method name=\"GetMachineId\">\n"                            \
+        "   <arg type=\"s\" name=\"machine_uuid\" direction=\"out\"/>\n" \
+        "  </method>\n"                                                 \
+        " </interface>\n"
+
+#define BUS_INTROSPECT_INTERFACE_INTROSPECTABLE                      \
+        " <interface name=\"org.freedesktop.DBus.Introspectable\">\n"   \
+        "  <method name=\"Introspect\">\n"                              \
+        "   <arg name=\"data\" type=\"s\" direction=\"out\"/>\n"        \
+        "  </method>\n"                                                 \
+        " </interface>\n"
+
+#define BUS_INTROSPECT_INTERFACE_PROPERTIES                          \
+        " <interface name=\"org.freedesktop.DBus.Properties\">\n"       \
+        "  <method name=\"Get\">\n"                                     \
+        "   <arg name=\"interface\" direction=\"in\" type=\"s\"/>\n"    \
+        "   <arg name=\"property\" direction=\"in\" type=\"s\"/>\n"     \
+        "   <arg name=\"value\" direction=\"out\" type=\"v\"/>\n"       \
+        "  </method>\n"                                                 \
+        "  <method name=\"GetAll\">\n"                                  \
+        "   <arg name=\"interface\" direction=\"in\" type=\"s\"/>\n"    \
+        "   <arg name=\"properties\" direction=\"out\" type=\"a{sv}\"/>\n" \
+        "  </method>\n"                                                 \
+        "  <method name=\"Set\">\n"                                     \
+        "   <arg name=\"interface\" direction=\"in\" type=\"s\"/>\n"    \
+        "   <arg name=\"property\" direction=\"in\" type=\"s\"/>\n"     \
+        "   <arg name=\"value\" direction=\"in\" type=\"v\"/>\n"        \
+        "  </method>\n"                                                 \
+        "  <signal name=\"PropertiesChanged\">\n"                       \
+        "   <arg type=\"s\" name=\"interface\"/>\n"                     \
+        "   <arg type=\"a{sv}\" name=\"changed_properties\"/>\n"        \
+        "   <arg type=\"as\" name=\"invalidated_properties\"/>\n"       \
+        "  </signal>\n"                                                 \
+        " </interface>\n"
+
+#define BUS_INTROSPECT_INTERFACE_OBJECT_MANAGER                      \
+        " <interface name=\"org.freedesktop.DBus.ObjectManager\">\n"    \
+        "  <method name=\"GetManagedObjects\">\n"                       \
+        "   <arg type=\"a{oa{sa{sv}}}\" name=\"object_paths_interfaces_and_properties\" direction=\"out\"/>\n" \
+        "  </method>\n"                                                 \
+        "  <signal name=\"InterfacesAdded\">\n"                         \
+        "   <arg type=\"o\" name=\"object_path\"/>\n"                   \
+        "   <arg type=\"a{sa{sv}}\" name=\"interfaces_and_properties\"/>\n" \
+        "  </signal>\n"                                                 \
+        "  <signal name=\"InterfacesRemoved\">\n"                       \
+        "   <arg type=\"o\" name=\"object_path\"/>\n"                   \
+        "   <arg type=\"as\" name=\"interfaces\"/>\n"                   \
+        "  </signal>\n"                                                 \
+        " </interface>\n"
diff --git a/src/libsystemd-bus/bus-socket.c b/src/libsystemd-bus/bus-socket.c
index d7d3b4dac5..69f78c9a58 100644
--- a/src/libsystemd-bus/bus-socket.c
+++ b/src/libsystemd-bus/bus-socket.c
@@ -874,10 +874,10 @@ static int bus_socket_read_message_need(sd_bus *bus, size_t *need) {
         b = ((const uint32_t*) bus->rbuffer)[3];
 
         e = ((const uint8_t*) bus->rbuffer)[0];
-        if (e == SD_BUS_LITTLE_ENDIAN) {
+        if (e == BUS_LITTLE_ENDIAN) {
                 a = le32toh(a);
                 b = le32toh(b);
-        } else if (e == SD_BUS_BIG_ENDIAN) {
+        } else if (e == BUS_BIG_ENDIAN) {
                 a = be32toh(a);
                 b = be32toh(b);
         } else
diff --git a/src/libsystemd-bus/bus-util.c b/src/libsystemd-bus/bus-util.c
index bd005262eb..1945f47994 100644
--- a/src/libsystemd-bus/bus-util.c
+++ b/src/libsystemd-bus/bus-util.c
@@ -66,7 +66,7 @@ int bus_async_unregister_and_quit(sd_event *e, sd_bus *bus, const char *name) {
         if (r < 0)
                 return r;
 
-        if (r != SD_BUS_NAME_RELEASED)
+        if (r != BUS_NAME_RELEASED)
                 return -EIO;
 
         return 0;
diff --git a/src/libsystemd-bus/sd-bus.c b/src/libsystemd-bus/sd-bus.c
index a86e33ce27..fef122bf3e 100644
--- a/src/libsystemd-bus/sd-bus.c
+++ b/src/libsystemd-bus/sd-bus.c
@@ -47,6 +47,7 @@
 #include "bus-objects.h"
 #include "bus-util.h"
 #include "bus-container.h"
+#include "bus-protocol.h"
 
 static int bus_poll(sd_bus *bus, bool need_more, uint64_t timeout_usec);
 
@@ -1408,7 +1409,7 @@ _public_ int sd_bus_send(sd_bus *bus, sd_bus_message *m, uint64_t *serial) {
         /* If the serial number isn't kept, then we know that no reply
          * is expected */
         if (!serial && !m->sealed)
-                m->header->flags |= SD_BUS_MESSAGE_NO_REPLY_EXPECTED;
+                m->header->flags |= BUS_MESSAGE_NO_REPLY_EXPECTED;
 
         r = bus_seal_message(bus, m);
         if (r < 0)
@@ -1524,7 +1525,7 @@ _public_ int sd_bus_call_async(
         assert_return(BUS_IS_OPEN(bus->state), -ENOTCONN);
         assert_return(m, -EINVAL);
         assert_return(m->header->type == SD_BUS_MESSAGE_METHOD_CALL, -EINVAL);
-        assert_return(!(m->header->flags & SD_BUS_MESSAGE_NO_REPLY_EXPECTED), -EINVAL);
+        assert_return(!(m->header->flags & BUS_MESSAGE_NO_REPLY_EXPECTED), -EINVAL);
         assert_return(callback, -EINVAL);
         assert_return(!bus_pid_changed(bus), -ECHILD);
 
@@ -1634,7 +1635,7 @@ _public_ int sd_bus_call(
         assert_return(BUS_IS_OPEN(bus->state), -ENOTCONN);
         assert_return(m, -EINVAL);
         assert_return(m->header->type == SD_BUS_MESSAGE_METHOD_CALL, -EINVAL);
-        assert_return(!(m->header->flags & SD_BUS_MESSAGE_NO_REPLY_EXPECTED), -EINVAL);
+        assert_return(!(m->header->flags & BUS_MESSAGE_NO_REPLY_EXPECTED), -EINVAL);
         assert_return(!bus_error_is_dirty(error), -EINVAL);
         assert_return(!bus_pid_changed(bus), -ECHILD);
 
@@ -1976,7 +1977,7 @@ static int process_builtin(sd_bus *bus, sd_bus_message *m) {
         if (!streq_ptr(m->interface, "org.freedesktop.DBus.Peer"))
                 return 0;
 
-        if (m->header->flags & SD_BUS_MESSAGE_NO_REPLY_EXPECTED)
+        if (m->header->flags & BUS_MESSAGE_NO_REPLY_EXPECTED)
                 return 1;
 
         if (streq_ptr(m->member, "Ping"))
diff --git a/src/systemd/sd-bus-protocol.h b/src/systemd/sd-bus-protocol.h
index 07fade6039..b2db7e46b8 100644
--- a/src/systemd/sd-bus-protocol.h
+++ b/src/systemd/sd-bus-protocol.h
@@ -66,125 +66,17 @@ enum {
         SD_BUS_TYPE_DICT_ENTRY_END   = '}',
 };
 
-/* Endianness */
-
-enum {
-        _SD_BUS_INVALID_ENDIAN = 0,
-        SD_BUS_LITTLE_ENDIAN   = 'l',
-        SD_BUS_BIG_ENDIAN      = 'B',
-#if __BYTE_ORDER == __BIG_ENDIAN
-        SD_BUS_NATIVE_ENDIAN   = SD_BUS_BIG_ENDIAN,
-        SD_BUS_REVERSE_ENDIAN  = SD_BUS_LITTLE_ENDIAN
-#else
-        SD_BUS_NATIVE_ENDIAN   = SD_BUS_LITTLE_ENDIAN,
-        SD_BUS_REVERSE_ENDIAN  = SD_BUS_BIG_ENDIAN
-#endif
-};
-
-/* Flags */
-
-enum {
-        SD_BUS_MESSAGE_NO_REPLY_EXPECTED = 1,
-        SD_BUS_MESSAGE_NO_AUTO_START = 2
-};
-
-/* Header fields */
-
-enum {
-        _SD_BUS_MESSAGE_HEADER_INVALID = 0,
-        SD_BUS_MESSAGE_HEADER_PATH,
-        SD_BUS_MESSAGE_HEADER_INTERFACE,
-        SD_BUS_MESSAGE_HEADER_MEMBER,
-        SD_BUS_MESSAGE_HEADER_ERROR_NAME,
-        SD_BUS_MESSAGE_HEADER_REPLY_SERIAL,
-        SD_BUS_MESSAGE_HEADER_DESTINATION,
-        SD_BUS_MESSAGE_HEADER_SENDER,
-        SD_BUS_MESSAGE_HEADER_SIGNATURE,
-        SD_BUS_MESSAGE_HEADER_UNIX_FDS,
-        _SD_BUS_MESSAGE_HEADER_MAX
-};
-
 /* RequestName parameters */
+
 enum  {
         SD_BUS_NAME_ALLOW_REPLACEMENT = 1,
         SD_BUS_NAME_REPLACE_EXISTING = 2,
         SD_BUS_NAME_DO_NOT_QUEUE = 4
 };
 
-/* RequestName returns */
-enum  {
-        SD_BUS_NAME_PRIMARY_OWNER = 1,
-        SD_BUS_NAME_IN_QUEUE = 2,
-        SD_BUS_NAME_EXISTS = 3,
-        SD_BUS_NAME_ALREADY_OWNER = 4
-};
-
-/* ReleaseName returns */
-enum {
-        SD_BUS_NAME_RELEASED = 1,
-        SD_BUS_NAME_NON_EXISTENT = 2,
-        SD_BUS_NAME_NOT_OWNER = 3,
-};
-
-#define SD_BUS_INTROSPECT_DOCTYPE                                       \
-        "<!DOCTYPE node PUBLIC \"-//freedesktop//DTD D-BUS Object Introspection 1.0//EN\"\n" \
-        "\"http://www.freedesktop.org/standards/dbus/1.0/introspect.dtd\">\n"
-
-#define SD_BUS_INTROSPECT_INTERFACE_PEER                                \
-        " <interface name=\"org.freedesktop.DBus.Peer\">\n"             \
-        "  <method name=\"Ping\"/>\n"                                   \
-        "  <method name=\"GetMachineId\">\n"                            \
-        "   <arg type=\"s\" name=\"machine_uuid\" direction=\"out\"/>\n" \
-        "  </method>\n"                                                 \
-        " </interface>\n"
-
-#define SD_BUS_INTROSPECT_INTERFACE_INTROSPECTABLE                      \
-        " <interface name=\"org.freedesktop.DBus.Introspectable\">\n"   \
-        "  <method name=\"Introspect\">\n"                              \
-        "   <arg name=\"data\" type=\"s\" direction=\"out\"/>\n"        \
-        "  </method>\n"                                                 \
-        " </interface>\n"
-
-#define SD_BUS_INTROSPECT_INTERFACE_PROPERTIES                          \
-        " <interface name=\"org.freedesktop.DBus.Properties\">\n"       \
-        "  <method name=\"Get\">\n"                                     \
-        "   <arg name=\"interface\" direction=\"in\" type=\"s\"/>\n"    \
-        "   <arg name=\"property\" direction=\"in\" type=\"s\"/>\n"     \
-        "   <arg name=\"value\" direction=\"out\" type=\"v\"/>\n"       \
-        "  </method>\n"                                                 \
-        "  <method name=\"GetAll\">\n"                                  \
-        "   <arg name=\"interface\" direction=\"in\" type=\"s\"/>\n"    \
-        "   <arg name=\"properties\" direction=\"out\" type=\"a{sv}\"/>\n" \
-        "  </method>\n"                                                 \
-        "  <method name=\"Set\">\n"                                     \
-        "   <arg name=\"interface\" direction=\"in\" type=\"s\"/>\n"    \
-        "   <arg name=\"property\" direction=\"in\" type=\"s\"/>\n"     \
-        "   <arg name=\"value\" direction=\"in\" type=\"v\"/>\n"        \
-        "  </method>\n"                                                 \
-        "  <signal name=\"PropertiesChanged\">\n"                       \
-        "   <arg type=\"s\" name=\"interface\"/>\n"                     \
-        "   <arg type=\"a{sv}\" name=\"changed_properties\"/>\n"        \
-        "   <arg type=\"as\" name=\"invalidated_properties\"/>\n"       \
-        "  </signal>\n"                                                 \
-        " </interface>\n"
-
-#define SD_BUS_INTROSPECT_INTERFACE_OBJECT_MANAGER                      \
-        " <interface name=\"org.freedesktop.DBus.ObjectManager\">\n"    \
-        "  <method name=\"GetManagedObjects\">\n"                       \
-        "   <arg type=\"a{oa{sa{sv}}}\" name=\"object_paths_interfaces_and_properties\" direction=\"out\"/>\n" \
-        "  </method>\n"                                                 \
-        "  <signal name=\"InterfacesAdded\">\n"                         \
-        "   <arg type=\"o\" name=\"object_path\"/>\n"                   \
-        "   <arg type=\"a{sa{sv}}\" name=\"interfaces_and_properties\"/>\n" \
-        "  </signal>\n"                                                 \
-        "  <signal name=\"InterfacesRemoved\">\n"                       \
-        "   <arg type=\"o\" name=\"object_path\"/>\n"                   \
-        "   <arg type=\"as\" name=\"interfaces\"/>\n"                   \
-        "  </signal>\n"                                                 \
-        " </interface>\n"
-
 /* Well-known errors. Note that this is only a sanitized subset of the
  * errors that the reference implementation generates. */
+
 #define SD_BUS_ERROR_FAILED                     "org.freedesktop.DBus.Error.Failed"
 #define SD_BUS_ERROR_NO_MEMORY                  "org.freedesktop.DBus.Error.NoMemory"
 #define SD_BUS_ERROR_SERVICE_UNKNOWN            "org.freedesktop.DBus.Error.ServiceUnknown"