/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ /*** This file is part of systemd. Copyright 2010 Lennart Poettering systemd is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2.1 of the License, or (at your option) any later version. systemd is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details. You should have received a copy of the GNU Lesser General Public License along with systemd; If not, see <http://www.gnu.org/licenses/>. ***/ #include <sys/socket.h> #include <sys/un.h> #include <sys/types.h> #include <fcntl.h> #include <unistd.h> #include <string.h> #include <errno.h> #include <sys/poll.h> #include <stddef.h> #include <getopt.h> #include "log.h" #include "util.h" #include "socket-util.h" #include "sd-daemon.h" #include "sd-bus.h" #include "bus-internal.h" #include "bus-message.h" #include "bus-util.h" #include "build.h" #ifdef ENABLE_KDBUS const char *arg_bus_path = "kernel:path=/dev/kdbus/0-system/bus;unix:path=/run/dbus/system_bus_socket"; #else const char *arg_bus_path = "unix:path=/run/dbus/system_bus_socket"; #endif static int help(void) { printf("%s [OPTIONS...]\n\n" "Connection STDIO or a socket to a given bus address.\n\n" " -h --help Show this help\n" " --version Show package version\n" " -p --bus-path=PATH Bus address to forward to (default: %s)\n", program_invocation_short_name, arg_bus_path); return 0; } static int parse_argv(int argc, char *argv[]) { enum { ARG_VERSION = 0x100, }; static const struct option options[] = { { "help", no_argument, NULL, 'h' }, { "bus-path", required_argument, NULL, 'p' }, { NULL, 0, NULL, 0 } }; int c; assert(argc >= 0); assert(argv); while ((c = getopt_long(argc, argv, "hsup:", options, NULL)) >= 0) { switch (c) { case 'h': help(); return 0; case ARG_VERSION: puts(PACKAGE_STRING); puts(SYSTEMD_FEATURES); return 0; case '?': return -EINVAL; case 'p': arg_bus_path = optarg; break; default: log_error("Unknown option code %c", c); return -EINVAL; } } return 1; } int main(int argc, char *argv[]) { _cleanup_bus_unref_ 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) goto finish; 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 { log_error("Illegal number of file descriptors passed\n"); goto finish; } 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) { log_error("Failed to allocate bus: %s", strerror(-r)); goto finish; } r = sd_bus_set_address(a, arg_bus_path); if (r < 0) { log_error("Failed to set address to connect to: %s", strerror(-r)); goto finish; } r = sd_bus_negotiate_fds(a, is_unix); if (r < 0) { log_error("Failed to set FD negotiation: %s", strerror(-r)); goto finish; } r = sd_bus_start(a); if (r < 0) { log_error("Failed to start bus client: %s", strerror(-r)); goto finish; } r = sd_bus_get_server_id(a, &server_id); if (r < 0) { log_error("Failed to get server ID: %s", strerror(-r)); goto finish; } r = sd_bus_new(&b); if (r < 0) { log_error("Failed to allocate bus: %s", strerror(-r)); goto finish; } r = sd_bus_set_fd(b, in_fd, out_fd); if (r < 0) { log_error("Failed to set fds: %s", strerror(-r)); goto finish; } r = sd_bus_set_server(b, 1, server_id); if (r < 0) { log_error("Failed to set server mode: %s", strerror(-r)); goto finish; } r = sd_bus_negotiate_fds(b, is_unix); if (r < 0) { log_error("Failed to set FD negotiation: %s", strerror(-r)); goto finish; } r = sd_bus_set_anonymous(b, true); if (r < 0) { log_error("Failed to set anonymous authentication: %s", strerror(-r)); goto finish; } r = sd_bus_start(b); if (r < 0) { log_error("Failed to start bus client: %s", strerror(-r)); goto finish; } for (;;) { _cleanup_bus_message_unref_ sd_bus_message *m = NULL; int events_a, events_b, fd; uint64_t timeout_a, timeout_b, t; struct timespec _ts, *ts; r = sd_bus_process(a, &m); if (r < 0) { log_error("Failed to process bus a: %s", strerror(-r)); goto finish; } if (m) { r = sd_bus_send(b, m, NULL); if (r < 0) { log_error("Failed to send message: %s", strerror(-r)); goto finish; } } if (r > 0) continue; r = sd_bus_process(b, &m); if (r < 0) { /* treat 'connection reset by peer' as clean exit condition */ if (r == -ECONNRESET) r = 0; goto finish; } if (m) { r = sd_bus_send(a, m, NULL); if (r < 0) { log_error("Failed to send message: %s", strerror(-r)); goto finish; } } if (r > 0) continue; fd = sd_bus_get_fd(a); if (fd < 0) { log_error("Failed to get fd: %s", strerror(-r)); goto finish; } events_a = sd_bus_get_events(a); if (events_a < 0) { log_error("Failed to get events mask: %s", strerror(-r)); goto finish; } r = sd_bus_get_timeout(a, &timeout_a); if (r < 0) { log_error("Failed to get timeout: %s", strerror(-r)); goto finish; } events_b = sd_bus_get_events(b); if (events_b < 0) { log_error("Failed to get events mask: %s", strerror(-r)); goto finish; } r = sd_bus_get_timeout(b, &timeout_b); if (r < 0) { log_error("Failed to get timeout: %s", strerror(-r)); goto finish; } t = timeout_a; if (t == (uint64_t) -1 || (timeout_b != (uint64_t) -1 && timeout_b < timeout_a)) t = timeout_b; if (t == (uint64_t) -1) ts = NULL; else { usec_t nw; nw = now(CLOCK_MONOTONIC); if (t > nw) t -= nw; else t = 0; ts = timespec_store(&_ts, t); } { 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(p, ELEMENTSOF(p), ts, NULL); } if (r < 0) { log_error("ppoll() failed: %m"); goto finish; } } r = 0; finish: return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS; }