chiark / gitweb /
kbdus: add null bloom filter to our messages
[elogind.git] / src / libsystemd-bus / bus-message.h
1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
2
3 #pragma once
4
5 /***
6   This file is part of systemd.
7
8   Copyright 2013 Lennart Poettering
9
10   systemd is free software; you can redistribute it and/or modify it
11   under the terms of the GNU Lesser General Public License as published by
12   the Free Software Foundation; either version 2.1 of the License, or
13   (at your option) any later version.
14
15   systemd is distributed in the hope that it will be useful, but
16   WITHOUT ANY WARRANTY; without even the implied warranty of
17   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
18   Lesser General Public License for more details.
19
20   You should have received a copy of the GNU Lesser General Public License
21   along with systemd; If not, see <http://www.gnu.org/licenses/>.
22 ***/
23
24 #include <stdbool.h>
25 #include <byteswap.h>
26 #include <sys/socket.h>
27
28 #include "macro.h"
29 #include "sd-bus.h"
30 #include "kdbus.h"
31 #include "time-util.h"
32
33 struct bus_container {
34         char enclosing;
35
36         char *signature;
37         unsigned index;
38
39         uint32_t *array_size;
40         size_t begin;
41 };
42
43 struct bus_header {
44         uint8_t endian;
45         uint8_t type;
46         uint8_t flags;
47         uint8_t version;
48         uint32_t body_size;
49         uint32_t serial;
50         uint32_t fields_size;
51 } _packed_;
52
53 struct sd_bus_message {
54         unsigned n_ref;
55
56         uint32_t reply_serial;
57
58         const char *path;
59         const char *interface;
60         const char *member;
61         const char *destination;
62         const char *sender;
63
64         sd_bus_error error;
65
66         uid_t uid;
67         gid_t gid;
68         pid_t pid;
69         pid_t tid;
70         usec_t pid_starttime;
71         usec_t timestamp;
72
73         bool sealed:1;
74         bool dont_send:1;
75         bool allow_fds:1;
76         bool uid_valid:1;
77         bool gid_valid:1;
78         bool free_header:1;
79         bool free_fields:1;
80         bool free_body:1;
81         bool free_kdbus:1;
82         bool free_fds:1;
83
84         struct bus_header *header;
85         void *fields;
86         void *body;
87         struct kdbus_msg *kdbus;
88
89         char *label;
90
91         size_t rindex;
92
93         uint32_t n_fds;
94         int *fds;
95
96         struct bus_container root_container, *containers;
97         unsigned n_containers;
98
99         struct iovec iovec[4];
100         unsigned n_iovec;
101
102         char *peeked_signature;
103
104         usec_t timeout;
105
106         char sender_buffer[3 + DECIMAL_STR_MAX(uint64_t) + 1];
107         char destination_buffer[3 + DECIMAL_STR_MAX(uint64_t) + 1];
108 };
109
110 #define BUS_MESSAGE_NEED_BSWAP(m) ((m)->header->endian != SD_BUS_NATIVE_ENDIAN)
111
112 static inline uint16_t BUS_MESSAGE_BSWAP16(sd_bus_message *m, uint16_t u) {
113         return BUS_MESSAGE_NEED_BSWAP(m) ? bswap_16(u) : u;
114 }
115
116 static inline uint32_t BUS_MESSAGE_BSWAP32(sd_bus_message *m, uint32_t u) {
117         return BUS_MESSAGE_NEED_BSWAP(m) ? bswap_32(u) : u;
118 }
119
120 static inline uint64_t BUS_MESSAGE_BSWAP64(sd_bus_message *m, uint64_t u) {
121         return BUS_MESSAGE_NEED_BSWAP(m) ? bswap_64(u) : u;
122 }
123
124 static inline uint32_t BUS_MESSAGE_SERIAL(sd_bus_message *m) {
125         return BUS_MESSAGE_BSWAP32(m, m->header->serial);
126 }
127
128 static inline uint32_t BUS_MESSAGE_BODY_SIZE(sd_bus_message *m) {
129         return BUS_MESSAGE_BSWAP32(m, m->header->body_size);
130 }
131
132 static inline uint32_t BUS_MESSAGE_FIELDS_SIZE(sd_bus_message *m) {
133         return BUS_MESSAGE_BSWAP32(m, m->header->fields_size);
134 }
135
136 static inline uint32_t BUS_MESSAGE_SIZE(sd_bus_message *m) {
137         return
138                 sizeof(struct bus_header) +
139                 ALIGN8(BUS_MESSAGE_FIELDS_SIZE(m)) +
140                 BUS_MESSAGE_BODY_SIZE(m);
141 }
142
143 static inline void bus_message_unrefp(sd_bus_message **m) {
144         sd_bus_message_unref(*m);
145 }
146
147 #define _cleanup_bus_message_unref_ __attribute__((cleanup(bus_message_unrefp)))
148
149 int bus_message_seal(sd_bus_message *m, uint64_t serial);
150 int bus_message_dump(sd_bus_message *m);
151 int bus_message_get_blob(sd_bus_message *m, void **buffer, size_t *sz);
152 int bus_message_read_strv_extend(sd_bus_message *m, char ***l);
153
154 int bus_message_from_header(
155                 void *header,
156                 size_t length,
157                 int *fds,
158                 unsigned n_fds,
159                 const struct ucred *ucred,
160                 const char *label,
161                 size_t extra,
162                 sd_bus_message **ret);
163
164 int bus_message_from_malloc(
165                 void *buffer,
166                 size_t length,
167                 int *fds,
168                 unsigned n_fds,
169                 const struct ucred *ucred,
170                 const char *label,
171                 sd_bus_message **ret);
172
173 const char* bus_message_get_arg(sd_bus_message *m, unsigned i);
174
175 int bus_message_append_ap(sd_bus_message *m, const char *types, va_list ap);
176
177 int bus_message_parse_fields(sd_bus_message *m);
178
179 int bus_header_size(struct bus_header *h, size_t *sum);