/*-*- 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_pid_changed(bus), -ECHILD); if (!BUS_IS_OPEN(bus->state)) return -ENOTCONN; r = sd_bus_message_new_signal(bus, &m, path, interface, member); 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_pid_changed(bus), -ECHILD); if (!BUS_IS_OPEN(bus->state)) return -ENOTCONN; r = sd_bus_message_new_method_call(bus, &m, destination, path, interface, member); 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, -EINVAL); assert_return(!bus_pid_changed(call->bus), -ECHILD); if (!BUS_IS_OPEN(call->bus->state)) return -ENOTCONN; 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, -EINVAL); assert_return(!bus_pid_changed(call->bus), -ECHILD); if (!BUS_IS_OPEN(call->bus->state)) return -ENOTCONN; if (call->header->flags & BUS_MESSAGE_NO_REPLY_EXPECTED) return 0; r = sd_bus_message_new_method_error(call, &m, e); 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, -EINVAL); assert_return(!bus_pid_changed(call->bus), -ECHILD); if (!BUS_IS_OPEN(call->bus->state)) return -ENOTCONN; 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, -EINVAL); assert_return(!bus_pid_changed(call->bus), -ECHILD); if (!BUS_IS_OPEN(call->bus->state)) return -ENOTCONN; 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, -EINVAL); assert_return(!bus_pid_changed(call->bus), -ECHILD); if (!BUS_IS_OPEN(call->bus->state)) return -ENOTCONN; 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_pid_changed(bus), -ECHILD); if (!BUS_IS_OPEN(bus->state)) return -ENOTCONN; 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_pid_changed(bus), -ECHILD); if (!BUS_IS_OPEN(bus->state)) return -ENOTCONN; 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_pid_changed(bus), -ECHILD); if (!BUS_IS_OPEN(bus->state)) return -ENOTCONN; 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_pid_changed(bus), -ECHILD); if (!BUS_IS_OPEN(bus->state)) return -ENOTCONN; 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_pid_changed(bus), -ECHILD); if (!BUS_IS_OPEN(bus->state)) return -ENOTCONN; r = sd_bus_message_new_method_call(bus, &m, destination, path, "org.freedesktop.DBus.Properties", "Set"); 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, -EINVAL); assert_return(!bus_pid_changed(call->bus), -ECHILD); if (!BUS_IS_OPEN(call->bus->state)) return -ENOTCONN; 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_name_creds(call->bus, call->sender, mask, creds); else return sd_bus_get_owner_creds(call->bus, mask, creds); } return bus_creds_extend_by_pid(c, mask, creds); } _public_ int sd_bus_query_sender_privilege(sd_bus_message *call, int capability) { _cleanup_bus_creds_unref_ sd_bus_creds *creds = NULL; uid_t our_uid; bool know_caps = false; int r; assert_return(call, -EINVAL); assert_return(call->sealed, -EPERM); assert_return(call->bus, -EINVAL); assert_return(!bus_pid_changed(call->bus), -ECHILD); if (!BUS_IS_OPEN(call->bus->state)) return -ENOTCONN; if (capability >= 0) { r = sd_bus_query_sender_creds(call, SD_BUS_CREDS_UID|SD_BUS_CREDS_EUID|SD_BUS_CREDS_EFFECTIVE_CAPS, &creds); if (r < 0) return r; /* Note that not even on kdbus we might have the caps * field, due to faked identities, or namespace * translation issues. */ r = sd_bus_creds_has_effective_cap(creds, capability); if (r > 0) return 1; if (r == 0) know_caps = true; } else { r = sd_bus_query_sender_creds(call, SD_BUS_CREDS_UID|SD_BUS_CREDS_EUID, &creds); if (r < 0) return r; } /* Now, check the UID, but only if the capability check wasn't * sufficient */ our_uid = getuid(); if (our_uid != 0 || !know_caps || capability < 0) { uid_t sender_uid; /* Try to use the EUID, if we have it. */ r = sd_bus_creds_get_euid(creds, &sender_uid); if (r < 0) r = sd_bus_creds_get_uid(creds, &sender_uid); if (r >= 0) { /* Sender has same UID as us, then let's grant access */ if (sender_uid == our_uid) return 1; /* Sender is root, we are not root. */ if (our_uid != 0 && sender_uid == 0) return 1; } } return 0; }