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Diffstat (limited to 'src/libsystemd/bus-convenience.c')
| -rw-r--r-- | src/libsystemd/bus-convenience.c | 442 |
1 files changed, 442 insertions, 0 deletions
diff --git a/src/libsystemd/bus-convenience.c b/src/libsystemd/bus-convenience.c new file mode 100644 index 0000000000..3964960fab --- /dev/null +++ b/src/libsystemd/bus-convenience.c @@ -0,0 +1,442 @@ +/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ + +/*** + 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 "bus-internal.h" +#include "bus-message.h" +#include "bus-signature.h" +#include "bus-util.h" +#include "bus-type.h" + +_public_ int sd_bus_emit_signal( + sd_bus *bus, + const char *path, + const char *interface, + const char *member, + const char *types, ...) { + + _cleanup_bus_message_unref_ sd_bus_message *m = NULL; + int r; + + assert_return(bus, -EINVAL); + assert_return(BUS_IS_OPEN(bus->state), -ENOTCONN); + assert_return(!bus_pid_changed(bus), -ECHILD); + + r = sd_bus_message_new_signal(bus, path, interface, member, &m); + if (r < 0) + return r; + + if (!isempty(types)) { + va_list ap; + + va_start(ap, types); + r = bus_message_append_ap(m, types, ap); + va_end(ap); + if (r < 0) + return r; + } + + return sd_bus_send(bus, m, NULL); +} + +_public_ int sd_bus_call_method( + sd_bus *bus, + const char *destination, + const char *path, + const char *interface, + const char *member, + sd_bus_error *error, + sd_bus_message **reply, + const char *types, ...) { + + _cleanup_bus_message_unref_ sd_bus_message *m = NULL; + int r; + + assert_return(bus, -EINVAL); + assert_return(BUS_IS_OPEN(bus->state), -ENOTCONN); + assert_return(!bus_pid_changed(bus), -ECHILD); + + r = sd_bus_message_new_method_call(bus, destination, path, interface, member, &m); + if (r < 0) + return r; + + if (!isempty(types)) { + va_list ap; + + va_start(ap, types); + r = bus_message_append_ap(m, types, ap); + va_end(ap); + if (r < 0) + return r; + } + + return sd_bus_call(bus, m, 0, error, reply); +} + +_public_ int sd_bus_reply_method_return( + sd_bus_message *call, + const char *types, ...) { + + _cleanup_bus_message_unref_ sd_bus_message *m = NULL; + int r; + + assert_return(call, -EINVAL); + assert_return(call->sealed, -EPERM); + assert_return(call->header->type == SD_BUS_MESSAGE_METHOD_CALL, -EINVAL); + assert_return(call->bus && BUS_IS_OPEN(call->bus->state), -ENOTCONN); + assert_return(!bus_pid_changed(call->bus), -ECHILD); + + if (call->header->flags & BUS_MESSAGE_NO_REPLY_EXPECTED) + return 0; + + r = sd_bus_message_new_method_return(call, &m); + if (r < 0) + return r; + + if (!isempty(types)) { + va_list ap; + + va_start(ap, types); + r = bus_message_append_ap(m, types, ap); + va_end(ap); + if (r < 0) + return r; + } + + return sd_bus_send(call->bus, m, NULL); +} + +_public_ int sd_bus_reply_method_error( + sd_bus_message *call, + const sd_bus_error *e) { + + _cleanup_bus_message_unref_ sd_bus_message *m = NULL; + int r; + + assert_return(call, -EINVAL); + assert_return(call->sealed, -EPERM); + assert_return(call->header->type == SD_BUS_MESSAGE_METHOD_CALL, -EINVAL); + assert_return(sd_bus_error_is_set(e), -EINVAL); + assert_return(call->bus && BUS_IS_OPEN(call->bus->state), -ENOTCONN); + assert_return(!bus_pid_changed(call->bus), -ECHILD); + + if (call->header->flags & BUS_MESSAGE_NO_REPLY_EXPECTED) + return 0; + + r = sd_bus_message_new_method_error(call, e, &m); + if (r < 0) + return r; + + return sd_bus_send(call->bus, m, NULL); +} + +_public_ int sd_bus_reply_method_errorf( + sd_bus_message *call, + const char *name, + const char *format, + ...) { + + _cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL; + va_list ap; + + assert_return(call, -EINVAL); + assert_return(call->sealed, -EPERM); + assert_return(call->header->type == SD_BUS_MESSAGE_METHOD_CALL, -EINVAL); + assert_return(call->bus && BUS_IS_OPEN(call->bus->state), -ENOTCONN); + assert_return(!bus_pid_changed(call->bus), -ECHILD); + + if (call->header->flags & BUS_MESSAGE_NO_REPLY_EXPECTED) + return 0; + + va_start(ap, format); + bus_error_setfv(&error, name, format, ap); + va_end(ap); + + return sd_bus_reply_method_error(call, &error); +} + +_public_ int sd_bus_reply_method_errno( + sd_bus_message *call, + int error, + const sd_bus_error *p) { + + _cleanup_bus_error_free_ sd_bus_error berror = SD_BUS_ERROR_NULL; + + assert_return(call, -EINVAL); + assert_return(call->sealed, -EPERM); + assert_return(call->header->type == SD_BUS_MESSAGE_METHOD_CALL, -EINVAL); + assert_return(call->bus && BUS_IS_OPEN(call->bus->state), -ENOTCONN); + assert_return(!bus_pid_changed(call->bus), -ECHILD); + + if (call->header->flags & BUS_MESSAGE_NO_REPLY_EXPECTED) + return 0; + + if (sd_bus_error_is_set(p)) + return sd_bus_reply_method_error(call, p); + + sd_bus_error_set_errno(&berror, error); + + return sd_bus_reply_method_error(call, &berror); +} + +_public_ int sd_bus_reply_method_errnof( + sd_bus_message *call, + int error, + const char *format, + ...) { + + _cleanup_bus_error_free_ sd_bus_error berror = SD_BUS_ERROR_NULL; + va_list ap; + + assert_return(call, -EINVAL); + assert_return(call->sealed, -EPERM); + assert_return(call->header->type == SD_BUS_MESSAGE_METHOD_CALL, -EINVAL); + assert_return(call->bus && BUS_IS_OPEN(call->bus->state), -ENOTCONN); + assert_return(!bus_pid_changed(call->bus), -ECHILD); + + if (call->header->flags & BUS_MESSAGE_NO_REPLY_EXPECTED) + return 0; + + va_start(ap, format); + bus_error_set_errnofv(&berror, error, format, ap); + va_end(ap); + + return sd_bus_reply_method_error(call, &berror); +} + +_public_ int sd_bus_get_property( + sd_bus *bus, + const char *destination, + const char *path, + const char *interface, + const char *member, + sd_bus_error *error, + sd_bus_message **reply, + const char *type) { + + sd_bus_message *rep = NULL; + int r; + + assert_return(bus, -EINVAL); + assert_return(isempty(interface) || interface_name_is_valid(interface), -EINVAL); + assert_return(member_name_is_valid(member), -EINVAL); + assert_return(reply, -EINVAL); + assert_return(signature_is_single(type, false), -EINVAL); + assert_return(BUS_IS_OPEN(bus->state), -ENOTCONN); + assert_return(!bus_pid_changed(bus), -ECHILD); + + r = sd_bus_call_method(bus, destination, path, "org.freedesktop.DBus.Properties", "Get", error, &rep, "ss", strempty(interface), member); + if (r < 0) + return r; + + r = sd_bus_message_enter_container(rep, 'v', type); + if (r < 0) { + sd_bus_message_unref(rep); + return r; + } + + *reply = rep; + return 0; +} + +_public_ int sd_bus_get_property_trivial( + sd_bus *bus, + const char *destination, + const char *path, + const char *interface, + const char *member, + sd_bus_error *error, + char type, void *ptr) { + + _cleanup_bus_message_unref_ sd_bus_message *reply = NULL; + int r; + + assert_return(bus, -EINVAL); + assert_return(isempty(interface) || interface_name_is_valid(interface), -EINVAL); + assert_return(member_name_is_valid(member), -EINVAL); + assert_return(bus_type_is_trivial(type), -EINVAL); + assert_return(ptr, -EINVAL); + assert_return(BUS_IS_OPEN(bus->state), -ENOTCONN); + assert_return(!bus_pid_changed(bus), -ECHILD); + + r = sd_bus_call_method(bus, destination, path, "org.freedesktop.DBus.Properties", "Get", error, &reply, "ss", strempty(interface), member); + if (r < 0) + return r; + + r = sd_bus_message_enter_container(reply, 'v', CHAR_TO_STR(type)); + if (r < 0) + return r; + + r = sd_bus_message_read_basic(reply, type, ptr); + if (r < 0) + return r; + + return 0; +} + +_public_ int sd_bus_get_property_string( + sd_bus *bus, + const char *destination, + const char *path, + const char *interface, + const char *member, + sd_bus_error *error, + char **ret) { + + _cleanup_bus_message_unref_ sd_bus_message *reply = NULL; + const char *s; + char *n; + int r; + + assert_return(bus, -EINVAL); + assert_return(isempty(interface) || interface_name_is_valid(interface), -EINVAL); + assert_return(member_name_is_valid(member), -EINVAL); + assert_return(ret, -EINVAL); + assert_return(BUS_IS_OPEN(bus->state), -ENOTCONN); + assert_return(!bus_pid_changed(bus), -ECHILD); + + r = sd_bus_call_method(bus, destination, path, "org.freedesktop.DBus.Properties", "Get", error, &reply, "ss", strempty(interface), member); + if (r < 0) + return r; + + r = sd_bus_message_enter_container(reply, 'v', "s"); + if (r < 0) + return r; + + r = sd_bus_message_read_basic(reply, 's', &s); + if (r < 0) + return r; + + n = strdup(s); + if (!n) + return -ENOMEM; + + *ret = n; + return 0; +} + +_public_ int sd_bus_get_property_strv( + sd_bus *bus, + const char *destination, + const char *path, + const char *interface, + const char *member, + sd_bus_error *error, + char ***ret) { + + _cleanup_bus_message_unref_ sd_bus_message *reply = NULL; + int r; + + assert_return(bus, -EINVAL); + assert_return(isempty(interface) || interface_name_is_valid(interface), -EINVAL); + assert_return(member_name_is_valid(member), -EINVAL); + assert_return(ret, -EINVAL); + assert_return(BUS_IS_OPEN(bus->state), -ENOTCONN); + assert_return(!bus_pid_changed(bus), -ECHILD); + + r = sd_bus_call_method(bus, destination, path, "org.freedesktop.DBus.Properties", "Get", error, &reply, "ss", strempty(interface), member); + if (r < 0) + return r; + + r = sd_bus_message_enter_container(reply, 'v', NULL); + if (r < 0) + return r; + + r = sd_bus_message_read_strv(reply, ret); + if (r < 0) + return r; + + return 0; +} + +_public_ int sd_bus_set_property( + sd_bus *bus, + const char *destination, + const char *path, + const char *interface, + const char *member, + sd_bus_error *error, + const char *type, ...) { + + _cleanup_bus_message_unref_ sd_bus_message *m = NULL; + va_list ap; + int r; + + assert_return(bus, -EINVAL); + assert_return(isempty(interface) || interface_name_is_valid(interface), -EINVAL); + assert_return(member_name_is_valid(member), -EINVAL); + assert_return(signature_is_single(type, false), -EINVAL); + assert_return(BUS_IS_OPEN(bus->state), -ENOTCONN); + assert_return(!bus_pid_changed(bus), -ECHILD); + + r = sd_bus_message_new_method_call(bus, destination, path, "org.freedesktop.DBus.Properties", "Set", &m); + if (r < 0) + return r; + + r = sd_bus_message_append(m, "ss", strempty(interface), member); + if (r < 0) + return r; + + r = sd_bus_message_open_container(m, 'v', type); + if (r < 0) + return r; + + va_start(ap, type); + r = bus_message_append_ap(m, type, ap); + va_end(ap); + if (r < 0) + return r; + + r = sd_bus_message_close_container(m); + if (r < 0) + return r; + + return sd_bus_call(bus, m, 0, error, NULL); +} + +_public_ int sd_bus_query_sender_creds(sd_bus_message *call, uint64_t mask, sd_bus_creds **creds) { + sd_bus_creds *c; + + assert_return(call, -EINVAL); + assert_return(call->sealed, -EPERM); + assert_return(call->bus && BUS_IS_OPEN(call->bus->state), -ENOTCONN); + assert_return(!bus_pid_changed(call->bus), -ECHILD); + + c = sd_bus_message_get_creds(call); + + /* All data we need? */ + if (c && (mask & ~c->mask) == 0) { + *creds = sd_bus_creds_ref(c); + return 0; + } + + /* No data passed? Or not enough data passed to retrieve the missing bits? */ + if (!c || !(c->mask & SD_BUS_CREDS_PID)) { + /* We couldn't read anything from the call, let's try + * to get it from the sender or peer */ + + if (call->sender) + return sd_bus_get_owner(call->bus, call->sender, mask, creds); + else + return sd_bus_get_peer_creds(call->bus, mask, creds); + } + + return bus_creds_extend_by_pid(c, mask, creds); +} |