rename stdio-bridge to bus-proxyd

2 files changed, 311 insertions, 0 deletions

diff --git a/src/bus-proxyd/Makefile b/src/bus-proxyd/Makefile
new file mode 120000
index 000000000..d0b0e8e00
--- /dev/null
+++ b/src/bus-proxyd/Makefile
@@ -0,0 +1 @@
+../Makefile
\ No newline at end of file
diff --git a/src/bus-proxyd/bus-proxyd.c b/src/bus-proxyd/bus-proxyd.c
new file mode 100644
index 000000000..9c49e0ee8
--- /dev/null
+++ b/src/bus-proxyd/bus-proxyd.c
@@ -0,0 +1,310 @@
+/*-*- 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"
+
+#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:
+                        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;
+}