mirror of
https://github.com/morgan9e/systemd
synced 2026-04-14 00:14:32 +09:00
8bb6f4f164
When we use stdio-bridge via sd-bus to connect to a bus of a different user, container or host, stdio-bridge should not log at error level but at debug level as it's invoked by the sd-bus library and sd-bus should generally not log above debug level. We can't actually use the --quiet option yet as that would break connecting to hosts running older versions of systemd but let's already add the option now in preparation for a brighter future.
263 lines
9.3 KiB
C
263 lines
9.3 KiB
C
/* SPDX-License-Identifier: LGPL-2.1-or-later */
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#include <getopt.h>
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#include <poll.h>
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#include <unistd.h>
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#include "sd-bus.h"
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#include "sd-daemon.h"
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#include "build.h"
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#include "bus-internal.h"
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#include "bus-util.h"
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#include "errno-util.h"
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#include "io-util.h"
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#include "log.h"
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#include "main-func.h"
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#include "parse-argument.h"
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#include "time-util.h"
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static const char *arg_bus_path = DEFAULT_SYSTEM_BUS_ADDRESS;
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static BusTransport arg_transport = BUS_TRANSPORT_LOCAL;
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static RuntimeScope arg_runtime_scope = RUNTIME_SCOPE_SYSTEM;
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static bool arg_quiet = false;
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static int help(void) {
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printf("%s [OPTIONS...]\n\n"
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"Forward messages between a pipe or socket and a D-Bus bus.\n\n"
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" -h --help Show this help\n"
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" --version Show package version\n"
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" -p --bus-path=PATH Path to the bus address (default: %s)\n"
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" --system Connect to system bus\n"
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" --user Connect to user bus\n"
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" -M --machine=CONTAINER Name of local container to connect to\n"
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" -q --quiet Fail silently instead of logging errors\n",
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program_invocation_short_name, DEFAULT_SYSTEM_BUS_ADDRESS);
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return 0;
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}
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static int parse_argv(int argc, char *argv[]) {
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enum {
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ARG_VERSION = 0x100,
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ARG_USER,
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ARG_SYSTEM,
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};
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static const struct option options[] = {
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{ "help", no_argument, NULL, 'h' },
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{ "version", no_argument, NULL, ARG_VERSION },
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{ "bus-path", required_argument, NULL, 'p' },
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{ "user", no_argument, NULL, ARG_USER },
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{ "system", no_argument, NULL, ARG_SYSTEM },
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{ "machine", required_argument, NULL, 'M' },
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{ "quiet", no_argument, NULL, 'q' },
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{},
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};
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int c, r;
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assert(argc >= 0);
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assert(argv);
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while ((c = getopt_long(argc, argv, "hp:M:", options, NULL)) >= 0)
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switch (c) {
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case 'h':
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return help();
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case ARG_VERSION:
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return version();
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case ARG_USER:
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arg_runtime_scope = RUNTIME_SCOPE_USER;
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break;
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case ARG_SYSTEM:
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arg_runtime_scope = RUNTIME_SCOPE_SYSTEM;
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break;
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case 'p':
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arg_bus_path = optarg;
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break;
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case 'M':
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r = parse_machine_argument(optarg, &arg_bus_path, &arg_transport);
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if (r < 0)
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return r;
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break;
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case 'q':
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arg_quiet = true;
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break;
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case '?':
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return -EINVAL;
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default:
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assert_not_reached();
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}
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if (argc > optind)
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return log_full_errno(arg_quiet ? LOG_DEBUG : LOG_ERR, SYNTHETIC_ERRNO(EINVAL),
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"%s takes no arguments.",
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program_invocation_short_name);
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return 1;
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}
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static int run(int argc, char *argv[]) {
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_cleanup_(sd_bus_flush_close_unrefp) sd_bus *a = NULL, *b = NULL;
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sd_id128_t server_id;
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bool is_unix;
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int in_fd, out_fd, r;
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log_setup();
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r = parse_argv(argc, argv);
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if (r <= 0)
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return r;
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int priority = arg_quiet ? LOG_DEBUG : LOG_ERR;
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r = sd_listen_fds(0);
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if (r == 0) {
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in_fd = STDIN_FILENO;
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out_fd = STDOUT_FILENO;
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} else if (r == 1) {
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in_fd = SD_LISTEN_FDS_START;
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out_fd = SD_LISTEN_FDS_START;
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} else
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return log_full_errno(priority, SYNTHETIC_ERRNO(EINVAL),
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"More than one file descriptor was passed.");
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is_unix =
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sd_is_socket(in_fd, AF_UNIX, 0, 0) > 0 &&
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sd_is_socket(out_fd, AF_UNIX, 0, 0) > 0;
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r = sd_bus_new(&a);
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if (r < 0)
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return log_full_errno(priority, r, "Failed to allocate bus: %m");
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if (arg_transport == BUS_TRANSPORT_MACHINE)
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r = bus_set_address_machine(a, arg_runtime_scope, arg_bus_path);
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else
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r = sd_bus_set_address(a, arg_bus_path);
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if (r < 0)
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return log_full_errno(priority, r, "Failed to set address to connect to: %m");
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r = sd_bus_negotiate_fds(a, is_unix);
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if (r < 0)
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return log_full_errno(priority, r, "Failed to set FD negotiation: %m");
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r = sd_bus_start(a);
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if (r < 0)
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return bus_log_connect_full(priority, r, arg_transport, arg_runtime_scope);
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r = sd_bus_get_bus_id(a, &server_id);
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if (r < 0)
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return log_full_errno(priority, r, "Failed to get server ID: %m");
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r = sd_bus_new(&b);
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if (r < 0)
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return log_full_errno(priority, r, "Failed to allocate bus: %m");
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r = sd_bus_set_fd(b, in_fd, out_fd);
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if (r < 0)
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return log_full_errno(priority, r, "Failed to set fds: %m");
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r = sd_bus_set_server(b, 1, server_id);
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if (r < 0)
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return log_full_errno(priority, r, "Failed to set server mode: %m");
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r = sd_bus_negotiate_fds(b, is_unix);
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if (r < 0)
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return log_full_errno(priority, r, "Failed to set FD negotiation: %m");
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r = sd_bus_set_anonymous(b, true);
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if (r < 0)
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return log_full_errno(priority, r, "Failed to set anonymous authentication: %m");
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r = sd_bus_start(b);
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if (r < 0)
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return log_full_errno(priority, r, "Failed to start bus forwarding server: %m");
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for (;;) {
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_cleanup_(sd_bus_message_unrefp) sd_bus_message *m = NULL;
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int events_a, events_b, fd;
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usec_t timeout_a, timeout_b, t;
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assert_cc(sizeof(usec_t) == sizeof(uint64_t));
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r = sd_bus_process(a, &m);
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if (ERRNO_IS_NEG_DISCONNECT(r)) /* Treat 'connection reset by peer' as clean exit condition */
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return 0;
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if (r < 0)
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return log_full_errno(priority, r, "Failed to process bus a: %m");
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if (m) {
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if (sd_bus_message_is_signal(m, "org.freedesktop.DBus.Local", "Disconnected"))
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return 0;
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r = sd_bus_send(b, m, NULL);
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if (r < 0)
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return log_full_errno(priority, r, "Failed to send message: %m");
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}
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if (r > 0)
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continue;
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r = sd_bus_process(b, &m);
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if (ERRNO_IS_NEG_DISCONNECT(r)) /* Treat 'connection reset by peer' as clean exit condition */
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return 0;
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if (r < 0)
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return log_full_errno(priority, r, "Failed to process bus: %m");
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if (m) {
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if (sd_bus_message_is_signal(m, "org.freedesktop.DBus.Local", "Disconnected"))
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return 0;
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r = sd_bus_send(a, m, NULL);
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if (r < 0)
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return log_full_errno(priority, r, "Failed to send message: %m");
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}
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if (r > 0)
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continue;
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fd = sd_bus_get_fd(a);
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if (fd < 0)
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return log_full_errno(priority, fd, "Failed to get fd: %m");
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events_a = sd_bus_get_events(a);
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if (events_a < 0)
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return log_full_errno(priority, events_a, "Failed to get events mask: %m");
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r = sd_bus_get_timeout(a, &timeout_a);
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if (r < 0)
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return log_full_errno(priority, r, "Failed to get timeout: %m");
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events_b = sd_bus_get_events(b);
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if (events_b < 0)
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return log_full_errno(priority, events_b, "Failed to get events mask: %m");
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r = sd_bus_get_timeout(b, &timeout_b);
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if (r < 0)
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return log_full_errno(priority, r, "Failed to get timeout: %m");
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t = usec_sub_unsigned(MIN(timeout_a, timeout_b), now(CLOCK_MONOTONIC));
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struct pollfd p[3] = {
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{ .fd = fd, .events = events_a },
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{ .fd = in_fd, .events = events_b & POLLIN },
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{ .fd = out_fd, .events = events_b & POLLOUT },
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};
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r = ppoll_usec(p, ELEMENTSOF(p), t);
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if (r < 0 && !ERRNO_IS_TRANSIENT(r)) /* don't be bothered by signals, i.e. EINTR */
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return log_full_errno(priority, r, "ppoll() failed: %m");
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}
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}
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DEFINE_MAIN_FUNCTION(run);
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