Adding upstream version 247.3.upstream/247.3upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 259 insertions, 0 deletions

diff --git a/src/stdio-bridge/stdio-bridge.c b/src/stdio-bridge/stdio-bridge.c
new file mode 100644
index 0000000..81d5071
--- /dev/null
+++ b/src/stdio-bridge/stdio-bridge.c
@@ -0,0 +1,259 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+
+#include <errno.h>
+#include <getopt.h>
+#include <poll.h>
+#include <stddef.h>
+#include <string.h>
+#include <unistd.h>
+
+#include "sd-bus.h"
+#include "sd-daemon.h"
+
+#include "alloc-util.h"
+#include "build.h"
+#include "bus-internal.h"
+#include "bus-util.h"
+#include "errno-util.h"
+#include "log.h"
+#include "main-func.h"
+#include "util.h"
+
+#define DEFAULT_BUS_PATH "unix:path=/run/dbus/system_bus_socket"
+
+static const char *arg_bus_path = DEFAULT_BUS_PATH;
+static BusTransport arg_transport = BUS_TRANSPORT_LOCAL;
+
+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"
+               "  -p --bus-path=PATH     Path to the kernel bus (default: %s)\n"
+               "  -M --machine=MACHINE   Name of machine to connect to\n",
+               program_invocation_short_name, DEFAULT_BUS_PATH);
+
+        return 0;
+}
+
+static int parse_argv(int argc, char *argv[]) {
+
+        enum {
+                ARG_VERSION = 0x100,
+                ARG_MACHINE,
+        };
+
+        static const struct option options[] = {
+                { "help",            no_argument,       NULL, 'h'         },
+                { "version",         no_argument,       NULL, ARG_VERSION },
+                { "bus-path",        required_argument, NULL, 'p'         },
+                { "machine",         required_argument, NULL, 'M'         },
+                {},
+        };
+
+        int c;
+
+        assert(argc >= 0);
+        assert(argv);
+
+        while ((c = getopt_long(argc, argv, "hp:M:", options, NULL)) >= 0) {
+
+                switch (c) {
+
+                case 'h':
+                        return help();
+
+                case ARG_VERSION:
+                        return version();
+
+                case 'p':
+                        arg_bus_path = optarg;
+                        break;
+
+                case 'M':
+                        arg_bus_path = optarg;
+                        arg_transport = BUS_TRANSPORT_MACHINE;
+                        break;
+
+                case '?':
+                        return -EINVAL;
+
+                default:
+                        return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
+                                               "Unknown option code %c", c);
+                }
+        }
+
+        return 1;
+}
+
+static int run(int argc, char *argv[]) {
+        _cleanup_(sd_bus_flush_close_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)
+                return r;
+
+        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
+                return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "Illegal number of file descriptors passed.");
+
+        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)
+                return log_error_errno(r, "Failed to allocate bus: %m");
+
+        if (arg_transport == BUS_TRANSPORT_MACHINE)
+                r = bus_set_address_system_machine(a, arg_bus_path);
+        else
+                r = sd_bus_set_address(a, arg_bus_path);
+        if (r < 0)
+                return log_error_errno(r, "Failed to set address to connect to: %m");
+
+        r = sd_bus_negotiate_fds(a, is_unix);
+        if (r < 0)
+                return log_error_errno(r, "Failed to set FD negotiation: %m");
+
+        r = sd_bus_start(a);
+        if (r < 0)
+                return log_error_errno(r, "Failed to start bus client: %m");
+
+        r = sd_bus_get_bus_id(a, &server_id);
+        if (r < 0)
+                return log_error_errno(r, "Failed to get server ID: %m");
+
+        r = sd_bus_new(&b);
+        if (r < 0)
+                return log_error_errno(r, "Failed to allocate bus: %m");
+
+        r = sd_bus_set_fd(b, in_fd, out_fd);
+        if (r < 0)
+                return log_error_errno(r, "Failed to set fds: %m");
+
+        r = sd_bus_set_server(b, 1, server_id);
+        if (r < 0)
+                return log_error_errno(r, "Failed to set server mode: %m");
+
+        r = sd_bus_negotiate_fds(b, is_unix);
+        if (r < 0)
+                return log_error_errno(r, "Failed to set FD negotiation: %m");
+
+        r = sd_bus_set_anonymous(b, true);
+        if (r < 0)
+                return log_error_errno(r, "Failed to set anonymous authentication: %m");
+
+        r = sd_bus_start(b);
+        if (r < 0)
+                return log_error_errno(r, "Failed to start bus client: %m");
+
+        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)
+                        return log_error_errno(r, "Failed to process bus a: %m");
+
+                if (m) {
+                        r = sd_bus_send(b, m, NULL);
+                        if (r < 0)
+                                return log_error_errno(r, "Failed to send message: %m");
+                }
+
+                if (r > 0)
+                        continue;
+
+                r = sd_bus_process(b, &m);
+                if (r < 0) {
+                        /* treat 'connection reset by peer' as clean exit condition */
+                        if (ERRNO_IS_DISCONNECT(r))
+                                return 0;
+
+                        return log_error_errno(r, "Failed to process bus: %m");
+                }
+
+                if (m) {
+                        r = sd_bus_send(a, m, NULL);
+                        if (r < 0)
+                                return log_error_errno(r, "Failed to send message: %m");
+                }
+
+                if (r > 0)
+                        continue;
+
+                fd = sd_bus_get_fd(a);
+                if (fd < 0)
+                        return log_error_errno(fd, "Failed to get fd: %m");
+
+                events_a = sd_bus_get_events(a);
+                if (events_a < 0)
+                        return log_error_errno(events_a, "Failed to get events mask: %m");
+
+                r = sd_bus_get_timeout(a, &timeout_a);
+                if (r < 0)
+                        return log_error_errno(r, "Failed to get timeout: %m");
+
+                events_b = sd_bus_get_events(b);
+                if (events_b < 0)
+                        return log_error_errno(events_b, "Failed to get events mask: %m");
+
+                r = sd_bus_get_timeout(b, &timeout_b);
+                if (r < 0)
+                        return log_error_errno(r, "Failed to get timeout: %m");
+
+                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)
+                        return log_error_errno(errno, "ppoll() failed: %m");
+                if (p[0].revents & POLLNVAL ||
+                    p[1].revents & POLLNVAL ||
+                    p[2].revents & POLLNVAL)
+                        return log_error_errno(SYNTHETIC_ERRNO(EBADF), "Invalid file descriptor to poll on?");
+        }
+
+        return 0;
+}
+
+DEFINE_MAIN_FUNCTION(run);