chiark / gitweb /
bus: also parse PID starttime out of kdbus message
[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
72         bool sealed:1;
73         bool dont_send:1;
74         bool allow_fds:1;
75         bool uid_valid:1;
76         bool gid_valid:1;
77         bool free_header:1;
78         bool free_fields:1;
79         bool free_body:1;
80         bool free_kdbus:1;
81         bool free_fds:1;
82
83         struct bus_header *header;
84         void *fields;
85         void *body;
86         struct kdbus_msg *kdbus;
87
88         char *label;
89
90         size_t rindex;
91
92         uint32_t n_fds;
93         int *fds;
94
95         struct bus_container root_container, *containers;
96         unsigned n_containers;
97
98         struct iovec iovec[4];
99         unsigned n_iovec;
100
101         char *peeked_signature;
102
103         usec_t timeout;
104 };
105
106 #define BUS_MESSAGE_NEED_BSWAP(m) ((m)->header->endian != SD_BUS_NATIVE_ENDIAN)
107
108 static inline uint16_t BUS_MESSAGE_BSWAP16(sd_bus_message *m, uint16_t u) {
109         return BUS_MESSAGE_NEED_BSWAP(m) ? bswap_16(u) : u;
110 }
111
112 static inline uint32_t BUS_MESSAGE_BSWAP32(sd_bus_message *m, uint32_t u) {
113         return BUS_MESSAGE_NEED_BSWAP(m) ? bswap_32(u) : u;
114 }
115
116 static inline uint64_t BUS_MESSAGE_BSWAP64(sd_bus_message *m, uint64_t u) {
117         return BUS_MESSAGE_NEED_BSWAP(m) ? bswap_64(u) : u;
118 }
119
120 static inline uint32_t BUS_MESSAGE_SERIAL(sd_bus_message *m) {
121         return BUS_MESSAGE_BSWAP32(m, m->header->serial);
122 }
123
124 static inline uint32_t BUS_MESSAGE_BODY_SIZE(sd_bus_message *m) {
125         return BUS_MESSAGE_BSWAP32(m, m->header->body_size);
126 }
127
128 static inline uint32_t BUS_MESSAGE_FIELDS_SIZE(sd_bus_message *m) {
129         return BUS_MESSAGE_BSWAP32(m, m->header->fields_size);
130 }
131
132 static inline uint32_t BUS_MESSAGE_SIZE(sd_bus_message *m) {
133         return
134                 sizeof(struct bus_header) +
135                 ALIGN8(BUS_MESSAGE_FIELDS_SIZE(m)) +
136                 BUS_MESSAGE_BODY_SIZE(m);
137 }
138
139 static inline void bus_message_unrefp(sd_bus_message **m) {
140         sd_bus_message_unref(*m);
141 }
142
143 #define _cleanup_bus_message_unref_ __attribute__((cleanup(bus_message_unrefp)))
144
145 int bus_message_seal(sd_bus_message *m, uint64_t serial);
146 int bus_message_dump(sd_bus_message *m);
147 int bus_message_get_blob(sd_bus_message *m, void **buffer, size_t *sz);
148 int bus_message_read_strv_extend(sd_bus_message *m, char ***l);
149
150 int bus_message_from_header(
151                 void *header,
152                 size_t length,
153                 int *fds,
154                 unsigned n_fds,
155                 const struct ucred *ucred,
156                 const char *label,
157                 size_t extra,
158                 sd_bus_message **ret);
159
160 int bus_message_from_malloc(
161                 void *buffer,
162                 size_t length,
163                 int *fds,
164                 unsigned n_fds,
165                 const struct ucred *ucred,
166                 const char *label,
167                 sd_bus_message **ret);
168
169 const char* bus_message_get_arg(sd_bus_message *m, unsigned i);
170
171 int bus_message_append_ap(sd_bus_message *m, const char *types, va_list ap);
172
173 int bus_message_parse_fields(sd_bus_message *m);
174
175 int bus_header_size(struct bus_header *h, size_t *sum);