summaryrefslogtreecommitdiff
path: root/src/libsystemd-bus/bus-message.h
blob: 34dbc5d563430310fa39204b47d56de5b8cf1928 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/

#pragma once

/***
  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 <stdbool.h>
#include <byteswap.h>
#include <sys/socket.h>

#include "macro.h"
#include "sd-bus.h"
#include "kdbus.h"
#include "time-util.h"
#include "bus-creds.h"

struct bus_container {
        char enclosing;

        unsigned index, saved_index;

        char *signature;

        uint32_t *array_size;
        size_t before, begin;
};

struct bus_header {
        uint8_t endian;
        uint8_t type;
        uint8_t flags;
        uint8_t version;
        uint32_t body_size;
        uint32_t serial;
        uint32_t fields_size;
} _packed_;

struct bus_body_part {
        struct bus_body_part *next;
        void *data;
        size_t size;
        size_t mapped;
        int memfd;
        bool free_this:1;
        bool munmap_this:1;
        bool sealed:1;
        bool is_zero:1;
};

struct sd_bus_message {
        unsigned n_ref;

        sd_bus *bus;

        uint32_t reply_serial;

        const char *path;
        const char *interface;
        const char *member;
        const char *destination;
        const char *sender;

        sd_bus_error error;

        sd_bus_creds creds;

        usec_t monotonic;
        usec_t realtime;

        bool sealed:1;
        bool dont_send:1;
        bool allow_fds:1;
        bool free_header:1;
        bool free_kdbus:1;
        bool free_fds:1;
        bool release_kdbus:1;
        bool poisoned:1;

        struct bus_header *header;
        struct bus_body_part body;
        struct bus_body_part *body_end;
        unsigned n_body_parts;

        size_t rindex;
        struct bus_body_part *cached_rindex_part;
        size_t cached_rindex_part_begin;

        uint32_t n_fds;
        int *fds;

        struct bus_container root_container, *containers;
        unsigned n_containers;

        struct iovec *iovec;
        struct iovec iovec_fixed[2];
        unsigned n_iovec;

        struct kdbus_msg *kdbus;

        char *peeked_signature;

        /* If set replies to this message must carry the signature
         * specified here to successfully seal. This is initialized
         * from the vtable data */
        const char *enforced_reply_signature;

        usec_t timeout;

        char sender_buffer[3 + DECIMAL_STR_MAX(uint64_t) + 1];
        char destination_buffer[3 + DECIMAL_STR_MAX(uint64_t) + 1];
};

#define BUS_MESSAGE_NEED_BSWAP(m) ((m)->header->endian != SD_BUS_NATIVE_ENDIAN)

static inline uint16_t BUS_MESSAGE_BSWAP16(sd_bus_message *m, uint16_t u) {
        return BUS_MESSAGE_NEED_BSWAP(m) ? bswap_16(u) : u;
}

static inline uint32_t BUS_MESSAGE_BSWAP32(sd_bus_message *m, uint32_t u) {
        return BUS_MESSAGE_NEED_BSWAP(m) ? bswap_32(u) : u;
}

static inline uint64_t BUS_MESSAGE_BSWAP64(sd_bus_message *m, uint64_t u) {
        return BUS_MESSAGE_NEED_BSWAP(m) ? bswap_64(u) : u;
}

static inline uint32_t BUS_MESSAGE_SERIAL(sd_bus_message *m) {
        return BUS_MESSAGE_BSWAP32(m, m->header->serial);
}

static inline uint32_t BUS_MESSAGE_BODY_SIZE(sd_bus_message *m) {
        return BUS_MESSAGE_BSWAP32(m, m->header->body_size);
}

static inline uint32_t BUS_MESSAGE_FIELDS_SIZE(sd_bus_message *m) {
        return BUS_MESSAGE_BSWAP32(m, m->header->fields_size);
}

static inline uint32_t BUS_MESSAGE_SIZE(sd_bus_message *m) {
        return
                sizeof(struct bus_header) +
                ALIGN8(BUS_MESSAGE_FIELDS_SIZE(m)) +
                BUS_MESSAGE_BODY_SIZE(m);
}

static inline uint32_t BUS_MESSAGE_BODY_BEGIN(sd_bus_message *m) {
        return
                sizeof(struct bus_header) +
                ALIGN8(BUS_MESSAGE_FIELDS_SIZE(m));
}

static inline void* BUS_MESSAGE_FIELDS(sd_bus_message *m) {
        return (uint8_t*) m->header + sizeof(struct bus_header);
}

int bus_message_seal(sd_bus_message *m, uint64_t serial);
int bus_message_get_blob(sd_bus_message *m, void **buffer, size_t *sz);
int bus_message_read_strv_extend(sd_bus_message *m, char ***l);

int bus_message_from_header(
                sd_bus *bus,
                void *header,
                size_t length,
                int *fds,
                unsigned n_fds,
                const struct ucred *ucred,
                const char *label,
                size_t extra,
                sd_bus_message **ret);

int bus_message_from_malloc(
                sd_bus *bus,
                void *buffer,
                size_t length,
                int *fds,
                unsigned n_fds,
                const struct ucred *ucred,
                const char *label,
                sd_bus_message **ret);

const char* bus_message_get_arg(sd_bus_message *m, unsigned i);

int bus_message_append_ap(sd_bus_message *m, const char *types, va_list ap);

int bus_message_parse_fields(sd_bus_message *m);

bool bus_header_is_complete(struct bus_header *h, size_t size);
int bus_header_message_size(struct bus_header *h, size_t *sum);

struct bus_body_part *message_append_part(sd_bus_message *m);

#define MESSAGE_FOREACH_PART(part, i, m) \
        for ((i) = 0, (part) = &(m)->body; (i) < (m)->n_body_parts; (i)++, (part) = (part)->next)

int bus_body_part_map(struct bus_body_part *part);
void bus_body_part_unmap(struct bus_body_part *part);

int bus_message_to_errno(sd_bus_message *m);

int bus_message_new_synthetic_error(sd_bus *bus, uint64_t serial, const sd_bus_error *e, sd_bus_message **m);