bus: add basic implementation of a native bus client library

1 files changed, 120 insertions, 0 deletions

diff --git a/src/libsystemd-bus/bus-message.h b/src/libsystemd-bus/bus-message.h
new file mode 100644
index 0000000000..c62659e424
--- /dev/null
+++ b/src/libsystemd-bus/bus-message.h
@@ -0,0 +1,120 @@
+/*-*- 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/>.
+***/
+
+#include <stdbool.h>
+#include <byteswap.h>
+
+#include "macro.h"
+#include "sd-bus.h"
+
+struct bus_container {
+        char enclosing;
+
+        char *signature;
+        unsigned index;
+
+        uint32_t *array_size;
+};
+
+_packed_ struct bus_header {
+        uint8_t endian;
+        uint8_t type;
+        uint8_t flags;
+        uint8_t version;
+        uint32_t body_size;
+        uint32_t serial;
+        uint32_t fields_size;
+};
+
+struct sd_bus_message {
+        unsigned n_ref;
+
+        uint32_t reply_serial;
+
+        const char *path;
+        const char *interface;
+        const char *member;
+        const char *destination;
+        const char *sender;
+        const char *signature;
+
+        sd_bus_error error;
+
+        uid_t uid;
+        gid_t gid;
+        pid_t pid;
+        pid_t tid;
+
+        bool sealed:1;
+        bool uid_valid:1;
+        bool gid_valid:1;
+        bool free_header:1;
+        bool free_fields:1;
+        bool free_body:1;
+
+        struct bus_header *header;
+        void *fields;
+        void *body;
+
+        uint32_t n_fds;
+        int *fds;
+
+        struct bus_container root_container, *sub_containers;
+        unsigned n_containers;
+
+        struct iovec iovec[4];
+        unsigned n_iovec;
+};
+
+#if __BYTE_ORDER == __BIG_ENDIAN
+#define BUS_MESSAGE_NEED_BSWAP(m) ((m)->header->endian != SD_BUS_BIG_ENDIAN)
+#else
+#define BUS_MESSAGE_NEED_BSWAP(m) ((m)->header->endian != SD_BUS_LITTLE_ENDIAN)
+#endif
+
+static inline uint32_t BUS_MESSAGE_BSWAP(sd_bus_message *m, uint32_t u) {
+        return BUS_MESSAGE_NEED_BSWAP(m) ? bswap_32(u) : u;
+}
+
+static inline uint32_t BUS_MESSAGE_SERIAL(sd_bus_message *m) {
+        return BUS_MESSAGE_BSWAP(m, m->header->serial);
+}
+
+static inline uint32_t BUS_MESSAGE_BODY_SIZE(sd_bus_message *m) {
+        return BUS_MESSAGE_BSWAP(m, m->header->body_size);
+}
+
+static inline uint32_t BUS_MESSAGE_FIELDS_SIZE(sd_bus_message *m) {
+        return BUS_MESSAGE_BSWAP(m, m->header->fields_size);
+}
+
+static inline void bus_message_unrefp(sd_bus_message **m) {
+        sd_bus_message_unref(*m);
+}
+
+#define _cleanup_bus_message_unref_ __attribute__((cleanup(bus_message_unrefp)))
+
+int message_parse(sd_bus_message *m);
+int message_seal(sd_bus_message *m, uint64_t serial);
+void message_dump(sd_bus_message *m);
+int bus_message_get_blob(sd_bus_message *m, void **buffer, size_t *sz);