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-rw-r--r--src/systemd-stdio-bridge/stdio-bridge.c302
1 files changed, 302 insertions, 0 deletions
diff --git a/src/systemd-stdio-bridge/stdio-bridge.c b/src/systemd-stdio-bridge/stdio-bridge.c
new file mode 100644
index 0000000000..9aa17e861c
--- /dev/null
+++ b/src/systemd-stdio-bridge/stdio-bridge.c
@@ -0,0 +1,302 @@
+/***
+ 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 <errno.h>
+#include <getopt.h>
+#include <poll.h>
+#include <stddef.h>
+#include <string.h>
+#include <unistd.h>
+
+#include <systemd/sd-bus.h>
+#include <systemd/sd-daemon.h>
+
+#include "sd-bus/bus-internal.h"
+#include "sd-bus/bus-util.h"
+#include "systemd-basic/build.h"
+#include "systemd-basic/log.h"
+#include "systemd-basic/util.h"
+
+#define DEFAULT_BUS_PATH "unix:path=/run/dbus/system_bus_socket"
+
+const char *arg_bus_path = DEFAULT_BUS_PATH;
+
+static int help(void) {
+
+ printf("%s [OPTIONS...]\n\n"
+ "STDIO or socket-activatable proxy to a given DBus endpoint.\n\n"
+ " -h --help Show this help\n"
+ " --version Show package version\n"
+ " --bus-path=PATH Path to the kernel bus (default: %s)\n",
+ program_invocation_short_name, DEFAULT_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:
+ return version();
+
+ 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_(sd_bus_unrefp) 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_errno(r, "Failed to allocate bus: %m");
+ goto finish;
+ }
+
+ r = sd_bus_set_address(a, arg_bus_path);
+ if (r < 0) {
+ log_error_errno(r, "Failed to set address to connect to: %m");
+ goto finish;
+ }
+
+ r = sd_bus_negotiate_fds(a, is_unix);
+ if (r < 0) {
+ log_error_errno(r, "Failed to set FD negotiation: %m");
+ goto finish;
+ }
+
+ r = sd_bus_start(a);
+ if (r < 0) {
+ log_error_errno(r, "Failed to start bus client: %m");
+ goto finish;
+ }
+
+ r = sd_bus_get_bus_id(a, &server_id);
+ if (r < 0) {
+ log_error_errno(r, "Failed to get server ID: %m");
+ goto finish;
+ }
+
+ r = sd_bus_new(&b);
+ if (r < 0) {
+ log_error_errno(r, "Failed to allocate bus: %m");
+ goto finish;
+ }
+
+ r = sd_bus_set_fd(b, in_fd, out_fd);
+ if (r < 0) {
+ log_error_errno(r, "Failed to set fds: %m");
+ goto finish;
+ }
+
+ r = sd_bus_set_server(b, 1, server_id);
+ if (r < 0) {
+ log_error_errno(r, "Failed to set server mode: %m");
+ goto finish;
+ }
+
+ r = sd_bus_negotiate_fds(b, is_unix);
+ if (r < 0) {
+ log_error_errno(r, "Failed to set FD negotiation: %m");
+ goto finish;
+ }
+
+ r = sd_bus_set_anonymous(b, true);
+ if (r < 0) {
+ log_error_errno(r, "Failed to set anonymous authentication: %m");
+ goto finish;
+ }
+
+ r = sd_bus_start(b);
+ if (r < 0) {
+ log_error_errno(r, "Failed to start bus client: %m");
+ goto finish;
+ }
+
+ for (;;) {
+ _cleanup_(sd_bus_message_unrefp)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_errno(r, "Failed to process bus a: %m");
+ goto finish;
+ }
+
+ if (m) {
+ r = sd_bus_send(b, m, NULL);
+ if (r < 0) {
+ log_error_errno(r, "Failed to send message: %m");
+ 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_errno(r, "Failed to send message: %m");
+ goto finish;
+ }
+ }
+
+ if (r > 0)
+ continue;
+
+ fd = sd_bus_get_fd(a);
+ if (fd < 0) {
+ r = fd;
+ log_error_errno(r, "Failed to get fd: %m");
+ goto finish;
+ }
+
+ events_a = sd_bus_get_events(a);
+ if (events_a < 0) {
+ r = events_a;
+ log_error_errno(r, "Failed to get events mask: %m");
+ goto finish;
+ }
+
+ r = sd_bus_get_timeout(a, &timeout_a);
+ if (r < 0) {
+ log_error_errno(r, "Failed to get timeout: %m");
+ goto finish;
+ }
+
+ events_b = sd_bus_get_events(b);
+ if (events_b < 0) {
+ r = events_b;
+ log_error_errno(r, "Failed to get events mask: %m");
+ goto finish;
+ }
+
+ r = sd_bus_get_timeout(b, &timeout_b);
+ if (r < 0) {
+ log_error_errno(r, "Failed to get timeout: %m");
+ 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;
+ }
+ }
+
+finish:
+ return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;
+}
generated by cgit v1.2.3 (git 2.25.1) at 2024-06-01 10:32:12 +0000