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/* 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_setup();
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);
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