chiark / gitweb /
bus: rename KDBUS_CMD_FNAME_POLICY_NONE -> KDBUS_CMD_FNAME_POLICY_OPEN
[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
107 #define BUS_MESSAGE_NEED_BSWAP(m) ((m)->header->endian != SD_BUS_NATIVE_ENDIAN)
108
109 static inline uint16_t BUS_MESSAGE_BSWAP16(sd_bus_message *m, uint16_t u) {
110         return BUS_MESSAGE_NEED_BSWAP(m) ? bswap_16(u) : u;
111 }
112
113 static inline uint32_t BUS_MESSAGE_BSWAP32(sd_bus_message *m, uint32_t u) {
114         return BUS_MESSAGE_NEED_BSWAP(m) ? bswap_32(u) : u;
115 }
116
117 static inline uint64_t BUS_MESSAGE_BSWAP64(sd_bus_message *m, uint64_t u) {
118         return BUS_MESSAGE_NEED_BSWAP(m) ? bswap_64(u) : u;
119 }
120
121 static inline uint32_t BUS_MESSAGE_SERIAL(sd_bus_message *m) {
122         return BUS_MESSAGE_BSWAP32(m, m->header->serial);
123 }
124
125 static inline uint32_t BUS_MESSAGE_BODY_SIZE(sd_bus_message *m) {
126         return BUS_MESSAGE_BSWAP32(m, m->header->body_size);
127 }
128
129 static inline uint32_t BUS_MESSAGE_FIELDS_SIZE(sd_bus_message *m) {
130         return BUS_MESSAGE_BSWAP32(m, m->header->fields_size);
131 }
132
133 static inline uint32_t BUS_MESSAGE_SIZE(sd_bus_message *m) {
134         return
135                 sizeof(struct bus_header) +
136                 ALIGN8(BUS_MESSAGE_FIELDS_SIZE(m)) +
137                 BUS_MESSAGE_BODY_SIZE(m);
138 }
139
140 static inline void bus_message_unrefp(sd_bus_message **m) {
141         sd_bus_message_unref(*m);
142 }
143
144 #define _cleanup_bus_message_unref_ __attribute__((cleanup(bus_message_unrefp)))
145
146 int bus_message_seal(sd_bus_message *m, uint64_t serial);
147 int bus_message_dump(sd_bus_message *m);
148 int bus_message_get_blob(sd_bus_message *m, void **buffer, size_t *sz);
149 int bus_message_read_strv_extend(sd_bus_message *m, char ***l);
150
151 int bus_message_from_header(
152                 void *header,
153                 size_t length,
154                 int *fds,
155                 unsigned n_fds,
156                 const struct ucred *ucred,
157                 const char *label,
158                 size_t extra,
159                 sd_bus_message **ret);
160
161 int bus_message_from_malloc(
162                 void *buffer,
163                 size_t length,
164                 int *fds,
165                 unsigned n_fds,
166                 const struct ucred *ucred,
167                 const char *label,
168                 sd_bus_message **ret);
169
170 const char* bus_message_get_arg(sd_bus_message *m, unsigned i);
171
172 int bus_message_append_ap(sd_bus_message *m, const char *types, va_list ap);
173
174 int bus_message_parse_fields(sd_bus_message *m);
175
176 int bus_header_size(struct bus_header *h, size_t *sum);