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
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
|
/* SPDX-License-Identifier: LGPL-2.1-or-later */
#include <errno.h>
#include <getopt.h>
#include <stddef.h>
#include <string.h>
#include <unistd.h>
#include "sd-bus.h"
#include "sd-daemon.h"
#include "alloc-util.h"
#include "build.h"
#include "bus-internal.h"
#include "bus-util.h"
#include "errno-util.h"
#include "io-util.h"
#include "log.h"
#include "main-func.h"
#define DEFAULT_BUS_PATH "unix:path=/run/dbus/system_bus_socket"
static const char *arg_bus_path = DEFAULT_BUS_PATH;
static BusTransport arg_transport = BUS_TRANSPORT_LOCAL;
static RuntimeScope arg_runtime_scope = RUNTIME_SCOPE_SYSTEM;
static int help(void) {
printf("%s [OPTIONS...]\n\n"
"Forward messages between a pipe or socket and a D-Bus bus.\n\n"
" -h --help Show this help\n"
" --version Show package version\n"
" -p --bus-path=PATH Path to the bus address (default: %s)\n"
" --system Connect to system bus\n"
" --user Connect to user bus\n"
" -M --machine=CONTAINER Name of local container to connect to\n",
program_invocation_short_name, DEFAULT_BUS_PATH);
return 0;
}
static int parse_argv(int argc, char *argv[]) {
enum {
ARG_VERSION = 0x100,
ARG_MACHINE,
ARG_USER,
ARG_SYSTEM,
};
static const struct option options[] = {
{ "help", no_argument, NULL, 'h' },
{ "version", no_argument, NULL, ARG_VERSION },
{ "bus-path", required_argument, NULL, 'p' },
{ "user", no_argument, NULL, ARG_USER },
{ "system", no_argument, NULL, ARG_SYSTEM },
{ "machine", required_argument, NULL, 'M' },
{},
};
int c;
assert(argc >= 0);
assert(argv);
while ((c = getopt_long(argc, argv, "hp:M:", options, NULL)) >= 0)
switch (c) {
case 'h':
return help();
case ARG_VERSION:
return version();
case ARG_USER:
arg_runtime_scope = RUNTIME_SCOPE_USER;
break;
case ARG_SYSTEM:
arg_runtime_scope = RUNTIME_SCOPE_SYSTEM;
break;
case 'p':
arg_bus_path = optarg;
break;
case 'M':
arg_bus_path = optarg;
arg_transport = BUS_TRANSPORT_MACHINE;
break;
case '?':
return -EINVAL;
default:
return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
"Unknown option code %c", c);
}
return 1;
}
static int run(int argc, char *argv[]) {
_cleanup_(sd_bus_flush_close_unrefp) sd_bus *a = NULL, *b = NULL;
sd_id128_t server_id;
bool is_unix;
int r, in_fd, out_fd;
log_set_target(LOG_TARGET_JOURNAL_OR_KMSG);
log_parse_environment();
log_open();
r = parse_argv(argc, argv);
if (r <= 0)
return r;
r = sd_listen_fds(0);
if (r == 0) {
in_fd = STDIN_FILENO;
out_fd = STDOUT_FILENO;
} else if (r == 1) {
in_fd = SD_LISTEN_FDS_START;
out_fd = SD_LISTEN_FDS_START;
} else
return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "More than one file descriptor was passed.");
is_unix =
sd_is_socket(in_fd, AF_UNIX, 0, 0) > 0 &&
sd_is_socket(out_fd, AF_UNIX, 0, 0) > 0;
r = sd_bus_new(&a);
if (r < 0)
return log_error_errno(r, "Failed to allocate bus: %m");
if (arg_transport == BUS_TRANSPORT_MACHINE)
r = bus_set_address_machine(a, arg_runtime_scope, arg_bus_path);
else
r = sd_bus_set_address(a, arg_bus_path);
if (r < 0)
return log_error_errno(r, "Failed to set address to connect to: %m");
r = sd_bus_negotiate_fds(a, is_unix);
if (r < 0)
return log_error_errno(r, "Failed to set FD negotiation: %m");
r = sd_bus_start(a);
if (r < 0)
return log_error_errno(r, "Failed to start bus client: %m");
r = sd_bus_get_bus_id(a, &server_id);
if (r < 0)
return log_error_errno(r, "Failed to get server ID: %m");
r = sd_bus_new(&b);
if (r < 0)
return log_error_errno(r, "Failed to allocate bus: %m");
r = sd_bus_set_fd(b, in_fd, out_fd);
if (r < 0)
return log_error_errno(r, "Failed to set fds: %m");
r = sd_bus_set_server(b, 1, server_id);
if (r < 0)
return log_error_errno(r, "Failed to set server mode: %m");
r = sd_bus_negotiate_fds(b, is_unix);
if (r < 0)
return log_error_errno(r, "Failed to set FD negotiation: %m");
r = sd_bus_set_anonymous(b, true);
if (r < 0)
return log_error_errno(r, "Failed to set anonymous authentication: %m");
r = sd_bus_start(b);
if (r < 0)
return log_error_errno(r, "Failed to start bus client: %m");
for (;;) {
_cleanup_(sd_bus_message_unrefp) sd_bus_message *m = NULL;
int events_a, events_b, fd;
usec_t timeout_a, timeout_b, t;
assert_cc(sizeof(usec_t) == sizeof(uint64_t));
r = sd_bus_process(a, &m);
if (ERRNO_IS_NEG_DISCONNECT(r)) /* Treat 'connection reset by peer' as clean exit condition */
return 0;
if (r < 0)
return log_error_errno(r, "Failed to process bus a: %m");
if (m) {
if (sd_bus_message_is_signal(m, "org.freedesktop.DBus.Local", "Disconnected"))
return 0;
r = sd_bus_send(b, m, NULL);
if (r < 0)
return log_error_errno(r, "Failed to send message: %m");
}
if (r > 0)
continue;
r = sd_bus_process(b, &m);
if (ERRNO_IS_NEG_DISCONNECT(r)) /* Treat 'connection reset by peer' as clean exit condition */
return 0;
if (r < 0)
return log_error_errno(r, "Failed to process bus: %m");
if (m) {
if (sd_bus_message_is_signal(m, "org.freedesktop.DBus.Local", "Disconnected"))
return 0;
r = sd_bus_send(a, m, NULL);
if (r < 0)
return log_error_errno(r, "Failed to send message: %m");
}
if (r > 0)
continue;
fd = sd_bus_get_fd(a);
if (fd < 0)
return log_error_errno(fd, "Failed to get fd: %m");
events_a = sd_bus_get_events(a);
if (events_a < 0)
return log_error_errno(events_a, "Failed to get events mask: %m");
r = sd_bus_get_timeout(a, &timeout_a);
if (r < 0)
return log_error_errno(r, "Failed to get timeout: %m");
events_b = sd_bus_get_events(b);
if (events_b < 0)
return log_error_errno(events_b, "Failed to get events mask: %m");
r = sd_bus_get_timeout(b, &timeout_b);
if (r < 0)
return log_error_errno(r, "Failed to get timeout: %m");
t = usec_sub_unsigned(MIN(timeout_a, timeout_b), now(CLOCK_MONOTONIC));
struct pollfd p[3] = {
{ .fd = fd, .events = events_a },
{ .fd = STDIN_FILENO, .events = events_b & POLLIN },
{ .fd = STDOUT_FILENO, .events = events_b & POLLOUT },
};
r = ppoll_usec(p, ELEMENTSOF(p), t);
if (r < 0 && !ERRNO_IS_TRANSIENT(r)) /* don't be bothered by signals, i.e. EINTR */
return log_error_errno(r, "ppoll() failed: %m");
}
}
DEFINE_MAIN_FUNCTION(run);
|
