302 lines
8.9 KiB
C
302 lines
8.9 KiB
C
/***
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This file is part of systemd.
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Copyright 2010 Lennart Poettering
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systemd is free software; you can redistribute it and/or modify it
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under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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systemd is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with systemd; If not, see <http://www.gnu.org/licenses/>.
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***/
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#include <errno.h>
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#include <getopt.h>
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#include <poll.h>
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#include <stddef.h>
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#include <string.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 "bus-internal.h"
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#include "bus-util.h"
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#include "build.h"
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#include "log.h"
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#include "util.h"
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#define DEFAULT_BUS_PATH "unix:path=/run/dbus/system_bus_socket"
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const char *arg_bus_path = DEFAULT_BUS_PATH;
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static int help(void) {
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printf("%s [OPTIONS...]\n\n"
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"STDIO or socket-activatable proxy to a given DBus endpoint.\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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" --bus-path=PATH Path to the kernel bus (default: %s)\n",
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program_invocation_short_name, DEFAULT_BUS_PATH);
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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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};
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static const struct option options[] = {
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{ "help", no_argument, NULL, 'h' },
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{ "bus-path", required_argument, NULL, 'p' },
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{ NULL, 0, NULL, 0 }
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};
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int c;
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assert(argc >= 0);
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assert(argv);
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while ((c = getopt_long(argc, argv, "hsup:", options, NULL)) >= 0) {
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switch (c) {
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case 'h':
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help();
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return 0;
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case ARG_VERSION:
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return version();
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case '?':
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return -EINVAL;
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case 'p':
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arg_bus_path = optarg;
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break;
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default:
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log_error("Unknown option code %c", c);
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return -EINVAL;
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}
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}
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return 1;
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}
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int main(int argc, char *argv[]) {
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_cleanup_(sd_bus_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 r, in_fd, out_fd;
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log_set_target(LOG_TARGET_JOURNAL_OR_KMSG);
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log_parse_environment();
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log_open();
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r = parse_argv(argc, argv);
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if (r <= 0)
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goto finish;
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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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log_error("Illegal number of file descriptors passed\n");
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goto finish;
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}
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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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log_error_errno(r, "Failed to allocate bus: %m");
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goto finish;
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}
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r = sd_bus_set_address(a, arg_bus_path);
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if (r < 0) {
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log_error_errno(r, "Failed to set address to connect to: %m");
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goto finish;
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}
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r = sd_bus_negotiate_fds(a, is_unix);
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if (r < 0) {
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log_error_errno(r, "Failed to set FD negotiation: %m");
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goto finish;
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}
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r = sd_bus_start(a);
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if (r < 0) {
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log_error_errno(r, "Failed to start bus client: %m");
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goto finish;
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}
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r = sd_bus_get_bus_id(a, &server_id);
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if (r < 0) {
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log_error_errno(r, "Failed to get server ID: %m");
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goto finish;
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}
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r = sd_bus_new(&b);
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if (r < 0) {
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log_error_errno(r, "Failed to allocate bus: %m");
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goto finish;
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}
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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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log_error_errno(r, "Failed to set fds: %m");
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goto finish;
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}
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r = sd_bus_set_server(b, 1, server_id);
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if (r < 0) {
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log_error_errno(r, "Failed to set server mode: %m");
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goto finish;
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}
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r = sd_bus_negotiate_fds(b, is_unix);
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if (r < 0) {
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log_error_errno(r, "Failed to set FD negotiation: %m");
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goto finish;
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}
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r = sd_bus_set_anonymous(b, true);
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if (r < 0) {
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log_error_errno(r, "Failed to set anonymous authentication: %m");
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goto finish;
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}
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r = sd_bus_start(b);
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if (r < 0) {
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log_error_errno(r, "Failed to start bus client: %m");
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goto finish;
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}
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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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uint64_t timeout_a, timeout_b, t;
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struct timespec _ts, *ts;
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r = sd_bus_process(a, &m);
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if (r < 0) {
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log_error_errno(r, "Failed to process bus a: %m");
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goto finish;
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}
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if (m) {
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r = sd_bus_send(b, m, NULL);
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if (r < 0) {
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log_error_errno(r, "Failed to send message: %m");
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goto finish;
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}
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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 (r < 0) {
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/* treat 'connection reset by peer' as clean exit condition */
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if (r == -ECONNRESET)
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r = 0;
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goto finish;
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}
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if (m) {
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r = sd_bus_send(a, m, NULL);
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if (r < 0) {
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log_error_errno(r, "Failed to send message: %m");
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goto finish;
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}
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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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log_error_errno(r, "Failed to get fd: %m");
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goto finish;
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}
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events_a = sd_bus_get_events(a);
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if (events_a < 0) {
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log_error_errno(r, "Failed to get events mask: %m");
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goto finish;
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}
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r = sd_bus_get_timeout(a, &timeout_a);
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if (r < 0) {
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log_error_errno(r, "Failed to get timeout: %m");
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goto finish;
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}
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events_b = sd_bus_get_events(b);
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if (events_b < 0) {
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log_error_errno(r, "Failed to get events mask: %m");
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goto finish;
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}
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r = sd_bus_get_timeout(b, &timeout_b);
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if (r < 0) {
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log_error_errno(r, "Failed to get timeout: %m");
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goto finish;
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}
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t = timeout_a;
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if (t == (uint64_t) -1 || (timeout_b != (uint64_t) -1 && timeout_b < timeout_a))
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t = timeout_b;
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if (t == (uint64_t) -1)
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ts = NULL;
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else {
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usec_t nw;
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nw = now(CLOCK_MONOTONIC);
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if (t > nw)
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t -= nw;
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else
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t = 0;
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ts = timespec_store(&_ts, t);
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}
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{
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struct pollfd p[3] = {
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{.fd = fd, .events = events_a, },
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{.fd = STDIN_FILENO, .events = events_b & POLLIN, },
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{.fd = STDOUT_FILENO, .events = events_b & POLLOUT, }};
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r = ppoll(p, ELEMENTSOF(p), ts, NULL);
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}
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if (r < 0) {
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log_error("ppoll() failed: %m");
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goto finish;
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}
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}
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r = 0;
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finish:
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return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;
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}
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