Line data Source code
1 : /* SPDX-License-Identifier: LGPL-2.1+ */
2 :
3 : #include <errno.h>
4 : #include <getopt.h>
5 : #include <poll.h>
6 : #include <stddef.h>
7 : #include <string.h>
8 : #include <unistd.h>
9 :
10 : #include "sd-bus.h"
11 : #include "sd-daemon.h"
12 :
13 : #include "alloc-util.h"
14 : #include "build.h"
15 : #include "bus-internal.h"
16 : #include "bus-util.h"
17 : #include "errno-util.h"
18 : #include "log.h"
19 : #include "main-func.h"
20 : #include "util.h"
21 :
22 : #define DEFAULT_BUS_PATH "unix:path=/run/dbus/system_bus_socket"
23 :
24 : static const char *arg_bus_path = DEFAULT_BUS_PATH;
25 : static BusTransport arg_transport = BUS_TRANSPORT_LOCAL;
26 :
27 3 : static int help(void) {
28 :
29 3 : printf("%s [OPTIONS...]\n\n"
30 : "STDIO or socket-activatable proxy to a given DBus endpoint.\n\n"
31 : " -h --help Show this help\n"
32 : " --version Show package version\n"
33 : " -p --bus-path=PATH Path to the kernel bus (default: %s)\n"
34 : " -M --machine=MACHINE Name of machine to connect to\n",
35 : program_invocation_short_name, DEFAULT_BUS_PATH);
36 :
37 3 : return 0;
38 : }
39 :
40 4 : static int parse_argv(int argc, char *argv[]) {
41 :
42 : enum {
43 : ARG_VERSION = 0x100,
44 : ARG_MACHINE,
45 : };
46 :
47 : static const struct option options[] = {
48 : { "help", no_argument, NULL, 'h' },
49 : { "version", no_argument, NULL, ARG_VERSION },
50 : { "bus-path", required_argument, NULL, 'p' },
51 : { "machine", required_argument, NULL, 'M' },
52 : {},
53 : };
54 :
55 : int c;
56 :
57 4 : assert(argc >= 0);
58 4 : assert(argv);
59 :
60 4 : while ((c = getopt_long(argc, argv, "hp:M:", options, NULL)) >= 0) {
61 :
62 4 : switch (c) {
63 :
64 3 : case 'h':
65 3 : return help();
66 :
67 0 : case ARG_VERSION:
68 0 : return version();
69 :
70 0 : case 'p':
71 0 : arg_bus_path = optarg;
72 0 : break;
73 :
74 0 : case 'M':
75 0 : arg_bus_path = optarg;
76 0 : arg_transport = BUS_TRANSPORT_MACHINE;
77 0 : break;
78 :
79 1 : case '?':
80 1 : return -EINVAL;
81 :
82 0 : default:
83 0 : return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
84 : "Unknown option code %c", c);
85 : }
86 : }
87 :
88 0 : return 1;
89 : }
90 :
91 4 : static int run(int argc, char *argv[]) {
92 4 : _cleanup_(sd_bus_flush_close_unrefp) sd_bus *a = NULL, *b = NULL;
93 : sd_id128_t server_id;
94 : bool is_unix;
95 : int r, in_fd, out_fd;
96 :
97 4 : log_set_target(LOG_TARGET_JOURNAL_OR_KMSG);
98 4 : log_parse_environment();
99 4 : log_open();
100 :
101 4 : r = parse_argv(argc, argv);
102 4 : if (r <= 0)
103 4 : return r;
104 :
105 0 : r = sd_listen_fds(0);
106 0 : if (r == 0) {
107 0 : in_fd = STDIN_FILENO;
108 0 : out_fd = STDOUT_FILENO;
109 0 : } else if (r == 1) {
110 0 : in_fd = SD_LISTEN_FDS_START;
111 0 : out_fd = SD_LISTEN_FDS_START;
112 : } else
113 0 : return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "Illegal number of file descriptors passed.");
114 :
115 0 : is_unix =
116 0 : sd_is_socket(in_fd, AF_UNIX, 0, 0) > 0 &&
117 0 : sd_is_socket(out_fd, AF_UNIX, 0, 0) > 0;
118 :
119 0 : r = sd_bus_new(&a);
120 0 : if (r < 0)
121 0 : return log_error_errno(r, "Failed to allocate bus: %m");
122 :
123 0 : if (arg_transport == BUS_TRANSPORT_MACHINE)
124 0 : r = bus_set_address_system_machine(a, arg_bus_path);
125 : else
126 0 : r = sd_bus_set_address(a, arg_bus_path);
127 0 : if (r < 0)
128 0 : return log_error_errno(r, "Failed to set address to connect to: %m");
129 :
130 0 : r = sd_bus_negotiate_fds(a, is_unix);
131 0 : if (r < 0)
132 0 : return log_error_errno(r, "Failed to set FD negotiation: %m");
133 :
134 0 : r = sd_bus_start(a);
135 0 : if (r < 0)
136 0 : return log_error_errno(r, "Failed to start bus client: %m");
137 :
138 0 : r = sd_bus_get_bus_id(a, &server_id);
139 0 : if (r < 0)
140 0 : return log_error_errno(r, "Failed to get server ID: %m");
141 :
142 0 : r = sd_bus_new(&b);
143 0 : if (r < 0)
144 0 : return log_error_errno(r, "Failed to allocate bus: %m");
145 :
146 0 : r = sd_bus_set_fd(b, in_fd, out_fd);
147 0 : if (r < 0)
148 0 : return log_error_errno(r, "Failed to set fds: %m");
149 :
150 0 : r = sd_bus_set_server(b, 1, server_id);
151 0 : if (r < 0)
152 0 : return log_error_errno(r, "Failed to set server mode: %m");
153 :
154 0 : r = sd_bus_negotiate_fds(b, is_unix);
155 0 : if (r < 0)
156 0 : return log_error_errno(r, "Failed to set FD negotiation: %m");
157 :
158 0 : r = sd_bus_set_anonymous(b, true);
159 0 : if (r < 0)
160 0 : return log_error_errno(r, "Failed to set anonymous authentication: %m");
161 :
162 0 : r = sd_bus_start(b);
163 0 : if (r < 0)
164 0 : return log_error_errno(r, "Failed to start bus client: %m");
165 :
166 0 : for (;;) {
167 0 : _cleanup_(sd_bus_message_unrefp) sd_bus_message *m = NULL;
168 : int events_a, events_b, fd;
169 : uint64_t timeout_a, timeout_b, t;
170 : struct timespec _ts, *ts;
171 :
172 0 : r = sd_bus_process(a, &m);
173 0 : if (r < 0)
174 0 : return log_error_errno(r, "Failed to process bus a: %m");
175 :
176 0 : if (m) {
177 0 : r = sd_bus_send(b, m, NULL);
178 0 : if (r < 0)
179 0 : return log_error_errno(r, "Failed to send message: %m");
180 : }
181 :
182 0 : if (r > 0)
183 0 : continue;
184 :
185 0 : r = sd_bus_process(b, &m);
186 0 : if (r < 0) {
187 : /* treat 'connection reset by peer' as clean exit condition */
188 0 : if (ERRNO_IS_DISCONNECT(r))
189 0 : return 0;
190 :
191 0 : return log_error_errno(r, "Failed to process bus: %m");
192 : }
193 :
194 0 : if (m) {
195 0 : r = sd_bus_send(a, m, NULL);
196 0 : if (r < 0)
197 0 : return log_error_errno(r, "Failed to send message: %m");
198 : }
199 :
200 0 : if (r > 0)
201 0 : continue;
202 :
203 0 : fd = sd_bus_get_fd(a);
204 0 : if (fd < 0)
205 0 : return log_error_errno(fd, "Failed to get fd: %m");
206 :
207 0 : events_a = sd_bus_get_events(a);
208 0 : if (events_a < 0)
209 0 : return log_error_errno(events_a, "Failed to get events mask: %m");
210 :
211 0 : r = sd_bus_get_timeout(a, &timeout_a);
212 0 : if (r < 0)
213 0 : return log_error_errno(r, "Failed to get timeout: %m");
214 :
215 0 : events_b = sd_bus_get_events(b);
216 0 : if (events_b < 0)
217 0 : return log_error_errno(events_b, "Failed to get events mask: %m");
218 :
219 0 : r = sd_bus_get_timeout(b, &timeout_b);
220 0 : if (r < 0)
221 0 : return log_error_errno(r, "Failed to get timeout: %m");
222 :
223 0 : t = timeout_a;
224 0 : if (t == (uint64_t) -1 || (timeout_b != (uint64_t) -1 && timeout_b < timeout_a))
225 0 : t = timeout_b;
226 :
227 0 : if (t == (uint64_t) -1)
228 0 : ts = NULL;
229 : else {
230 : usec_t nw;
231 :
232 0 : nw = now(CLOCK_MONOTONIC);
233 0 : if (t > nw)
234 0 : t -= nw;
235 : else
236 0 : t = 0;
237 :
238 0 : ts = timespec_store(&_ts, t);
239 : }
240 :
241 : {
242 0 : struct pollfd p[3] = {
243 : {.fd = fd, .events = events_a },
244 0 : {.fd = STDIN_FILENO, .events = events_b & POLLIN },
245 0 : {.fd = STDOUT_FILENO, .events = events_b & POLLOUT },
246 : };
247 :
248 0 : r = ppoll(p, ELEMENTSOF(p), ts, NULL);
249 : }
250 0 : if (r < 0)
251 0 : return log_error_errno(errno, "ppoll() failed: %m");
252 : }
253 :
254 : return 0;
255 : }
256 :
257 4 : DEFINE_MAIN_FUNCTION(run);
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