src/shared/bus-map-properties.c

/* SPDX-License-Identifier: LGPL-2.1+ */

#include "bus-map-properties.h"
#include "alloc-util.h"
#include "strv.h"
#include "bus-message.h"

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, unsigned flags, 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:
        case SD_BUS_TYPE_OBJECT_PATH: {
                const char **p = userdata;
                const char *s;

                r = sd_bus_message_read_basic(m, type, &s);
                if (r < 0)
                        return r;

                if (isempty(s))
                        s = NULL;

                if (flags & BUS_MAP_STRDUP)
                        return free_and_strdup((char **) userdata, s);

                *p = s;
                return 0;
        }

        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)
                        return r;

                return strv_extend_strv(p, l, false);
        }

        case SD_BUS_TYPE_BOOLEAN: {
                int b;

                r = sd_bus_message_read_basic(m, type, &b);
                if (r < 0)
                        return r;

                if (flags & BUS_MAP_BOOLEAN_AS_BOOL)
                        *(bool*) userdata = b;
                else
                        *(int*) userdata = b;

                return 0;
        }

        case SD_BUS_TYPE_INT32:
        case SD_BUS_TYPE_UINT32: {
                uint32_t u, *p = userdata;

                r = sd_bus_message_read_basic(m, type, &u);
                if (r < 0)
                        return r;

                *p = u;
                return 0;
        }

        case SD_BUS_TYPE_INT64:
        case SD_BUS_TYPE_UINT64: {
                uint64_t t, *p = userdata;

                r = sd_bus_message_read_basic(m, type, &t);
                if (r < 0)
                        return r;

                *p = t;
                return 0;
        }

        case SD_BUS_TYPE_DOUBLE: {
                double d, *p = userdata;

                r = sd_bus_message_read_basic(m, type, &d);
                if (r < 0)
                        return r;

                *p = d;
                return 0;
        }}

        return -EOPNOTSUPP;
}

int bus_message_map_all_properties(
                sd_bus_message *m,
                const struct bus_properties_map *map,
                unsigned flags,
                sd_bus_error *error,
                void *userdata) {

        int r;

        assert(m);
        assert(map);

        r = sd_bus_message_enter_container(m, SD_BUS_TYPE_ARRAY, "{sv}");
        if (r < 0)
                return r;

        while ((r = sd_bus_message_enter_container(m, SD_BUS_TYPE_DICT_ENTRY, "sv")) > 0) {
                const struct bus_properties_map *prop;
                const char *member;
                const char *contents;
                void *v;
                unsigned i;

                r = sd_bus_message_read_basic(m, SD_BUS_TYPE_STRING, &member);
                if (r < 0)
                        return r;

                for (i = 0, prop = NULL; map[i].member; i++)
                        if (streq(map[i].member, member)) {
                                prop = &map[i];
                                break;
                        }

                if (prop) {
                        r = sd_bus_message_peek_type(m, NULL, &contents);
                        if (r < 0)
                                return r;

                        r = sd_bus_message_enter_container(m, SD_BUS_TYPE_VARIANT, contents);
                        if (r < 0)
                                return r;

                        v = (uint8_t *)userdata + prop->offset;
                        if (map[i].set)
                                r = prop->set(sd_bus_message_get_bus(m), member, m, error, v);
                        else
                                r = map_basic(sd_bus_message_get_bus(m), member, m, flags, error, v);
                        if (r < 0)
                                return r;

                        r = sd_bus_message_exit_container(m);
                        if (r < 0)
                                return r;
                } else {
                        r = sd_bus_message_skip(m, "v");
                        if (r < 0)
                                return r;
                }

                r = sd_bus_message_exit_container(m);
                if (r < 0)
                        return r;
        }
        if (r < 0)
                return r;

        return sd_bus_message_exit_container(m);
}

int bus_map_all_properties(
                sd_bus *bus,
                const char *destination,
                const char *path,
                const struct bus_properties_map *map,
                unsigned flags,
                sd_bus_error *error,
                sd_bus_message **reply,
                void *userdata) {

        _cleanup_(sd_bus_message_unrefp) sd_bus_message *m = NULL;
        int r;

        assert(bus);
        assert(destination);
        assert(path);
        assert(map);
        assert(reply || (flags & BUS_MAP_STRDUP));

        r = sd_bus_call_method(
                        bus,
                        destination,
                        path,
                        "org.freedesktop.DBus.Properties",
                        "GetAll",
                        error,
                        &m,
                        "s", "");
        if (r < 0)
                return r;

        r = bus_message_map_all_properties(m, map, flags, error, userdata);
        if (r < 0)
                return r;

        if (reply)
                *reply = sd_bus_message_ref(m);

        return r;
}