ebcf1f97de
Message handler callbacks can be simplified drastically if the dispatcher automatically replies to method calls if errors are returned. Thus: add an sd_bus_error argument to all message handlers. When we dispatch a message handler and it returns negative or a set sd_bus_error we send this as message error back to the client. This means errors returned by handlers by default are given back to clients instead of rippling all the way up to the event loop, which is desirable to make things robust. As a side-effect we can now easily turn the SELinux checks into normal function calls, since the method call dispatcher will generate the right error replies automatically now. Also, make sure we always pass the error structure to all property and method handlers as last argument to follow the usual style of passing variables for return values as last argument.
175 lines
7.8 KiB
C
175 lines
7.8 KiB
C
/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
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#pragma once
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/***
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This file is part of systemd.
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Copyright 2013 Lennart Poettering
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systemd is free software; you can redistribute it and/or modify it
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under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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systemd is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with systemd; If not, see <http://www.gnu.org/licenses/>.
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***/
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#include "sd-event.h"
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#include "sd-bus.h"
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#include "hashmap.h"
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#include "time-util.h"
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#include "util.h"
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typedef enum BusTransport {
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BUS_TRANSPORT_LOCAL,
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BUS_TRANSPORT_REMOTE,
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BUS_TRANSPORT_CONTAINER,
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_BUS_TRANSPORT_MAX,
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_BUS_TRANSPORT_INVALID = -1
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} BusTransport;
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typedef int (*bus_property_set_t) (sd_bus *bus, const char *member, sd_bus_message *m, sd_bus_error *error, void *userdata);
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struct bus_properties_map {
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const char *member;
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const char *signature;
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bus_property_set_t set;
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size_t offset;
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};
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int bus_map_id128(sd_bus *bus, const char *member, sd_bus_message *m, sd_bus_error *error, void *userdata);
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int bus_map_all_properties(sd_bus *bus,
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const char *destination,
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const char *path,
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const struct bus_properties_map *map,
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void *userdata);
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int bus_async_unregister_and_quit(sd_event *e, sd_bus *bus, const char *name);
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int bus_event_loop_with_idle(sd_event *e, sd_bus *bus, const char *name, usec_t timeout);
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int bus_check_peercred(sd_bus *c);
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int bus_verify_polkit(sd_bus *bus, sd_bus_message *m, const char *action, bool interactive, bool *_challenge, sd_bus_error *e);
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int bus_verify_polkit_async(sd_bus *bus, Hashmap **registry, sd_bus_message *m, const char *action, bool interactive, sd_bus_error *error, sd_bus_message_handler_t callback, void *userdata);
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void bus_verify_polkit_async_registry_free(sd_bus *bus, Hashmap *registry);
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int bus_open_system_systemd(sd_bus **_bus);
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int bus_open_user_systemd(sd_bus **_bus);
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int bus_open_transport(BusTransport transport, const char *host, bool user, sd_bus **bus);
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int bus_open_transport_systemd(BusTransport transport, const char *host, bool user, sd_bus **bus);
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int bus_print_property(const char *name, sd_bus_message *property, bool all);
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int bus_print_all_properties(sd_bus *bus, const char *dest, const char *path, char **filter, bool all);
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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);
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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);
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#define bus_property_get_usec ((sd_bus_property_get_t) NULL)
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#define bus_property_set_usec ((sd_bus_property_set_t) NULL)
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assert_cc(sizeof(int) == sizeof(int32_t));
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#define bus_property_get_int ((sd_bus_property_get_t) NULL)
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assert_cc(sizeof(unsigned) == sizeof(unsigned));
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#define bus_property_get_unsigned ((sd_bus_property_get_t) NULL)
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/* On 64bit machines we can use the default serializer for size_t and
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* friends, otherwise we need to cast this manually */
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#if __SIZEOF_SIZE_T__ == 8
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#define bus_property_get_size ((sd_bus_property_get_t) NULL)
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#else
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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);
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#endif
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#if __SIZEOF_LONG__ == 8
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#define bus_property_get_long ((sd_bus_property_get_t) NULL)
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#define bus_property_get_ulong ((sd_bus_property_get_t) NULL)
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#else
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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);
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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);
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#endif
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/* uid_t and friends on Linux 32 bit. This means we can just use the
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* default serializer for 32bit unsigned, for serializing it, and map
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* it to NULL here */
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assert_cc(sizeof(uid_t) == sizeof(uint32_t));
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#define bus_property_get_uid ((sd_bus_property_get_t) NULL)
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assert_cc(sizeof(gid_t) == sizeof(uint32_t));
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#define bus_property_get_gid ((sd_bus_property_get_t) NULL)
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assert_cc(sizeof(pid_t) == sizeof(uint32_t));
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#define bus_property_get_pid ((sd_bus_property_get_t) NULL)
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assert_cc(sizeof(mode_t) == sizeof(uint32_t));
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#define bus_property_get_mode ((sd_bus_property_get_t) NULL)
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int bus_log_parse_error(int r);
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int bus_log_create_error(int r);
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typedef struct UnitInfo {
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const char *id;
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const char *description;
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const char *load_state;
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const char *active_state;
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const char *sub_state;
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const char *following;
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const char *unit_path;
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uint32_t job_id;
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const char *job_type;
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const char *job_path;
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} UnitInfo;
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int bus_parse_unit_info(sd_bus_message *message, UnitInfo *u);
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DEFINE_TRIVIAL_CLEANUP_FUNC(sd_bus*, sd_bus_unref);
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DEFINE_TRIVIAL_CLEANUP_FUNC(sd_bus_message*, sd_bus_message_unref);
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#define _cleanup_bus_unref_ _cleanup_(sd_bus_unrefp)
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#define _cleanup_bus_message_unref_ _cleanup_(sd_bus_message_unrefp)
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#define _cleanup_bus_error_free_ _cleanup_(sd_bus_error_free)
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#define BUS_DEFINE_PROPERTY_GET_ENUM(function, name, type) \
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int function(sd_bus *bus, \
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const char *path, \
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const char *interface, \
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const char *property, \
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sd_bus_message *reply, \
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void *userdata, \
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sd_bus_error *error) { \
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\
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const char *value; \
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type *field = userdata; \
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int r; \
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\
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assert(bus); \
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assert(reply); \
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assert(field); \
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\
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value = strempty(name##_to_string(*field)); \
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\
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r = sd_bus_message_append_basic(reply, 's', value); \
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if (r < 0) \
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return r; \
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\
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return 1; \
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} \
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struct __useless_struct_to_allow_trailing_semicolon__
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#define BUS_PROPERTY_DUAL_TIMESTAMP(name, offset, flags) \
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SD_BUS_PROPERTY(name, "t", bus_property_get_usec, offset + offsetof(struct dual_timestamp, realtime), flags), \
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SD_BUS_PROPERTY(name "Monotonic", "t", bus_property_get_usec, offset + offsetof(struct dual_timestamp, monotonic), flags)
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int bus_maybe_reply_error(sd_bus_message *m, int r, sd_bus_error *error);
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