#include "bus-message.h"
#include "bus-util.h"
#include "build.h"
+#include "strv.h"
+#include "def.h"
-#ifdef ENABLE_KDBUS
-const char *arg_address = "kernel:path=/dev/kdbus/0-system/bus;unix:path=/run/dbus/system_bus_socket";
-#else
-const char *arg_address = "unix:path=/run/dbus/system_bus_socket";
-#endif
+static const char *arg_address = DEFAULT_SYSTEM_BUS_PATH;
+static char *arg_command_line_buffer = NULL;
static int help(void) {
"Connect STDIO or a socket to a given bus address.\n\n"
" -h --help Show this help\n"
" --version Show package version\n"
- " --address=ADDRESS Connect to bus specified by address\n",
+ " --address=ADDRESS Connect to the bus specified by ADDRESS\n"
+ " (default: " DEFAULT_SYSTEM_BUS_PATH ")\n",
program_invocation_short_name);
return 0;
assert(argc >= 0);
assert(argv);
- while ((c = getopt_long(argc, argv, "hsup:", options, NULL)) >= 0) {
+ while ((c = getopt_long(argc, argv, "h", options, NULL)) >= 0) {
switch (c) {
}
}
+ /* If the first command line argument is only "x" characters
+ * we'll write who we are talking to into it, so that "ps" is
+ * explanatory */
+ arg_command_line_buffer = argv[optind];
+ if (argc > optind + 1 ||
+ (arg_command_line_buffer && arg_command_line_buffer[strspn(arg_command_line_buffer, "x")] != 0)) {
+ log_error("Too many arguments");
+ return -EINVAL;
+ }
+
+ return 1;
+}
+
+static int rename_service(sd_bus *a, sd_bus *b) {
+ _cleanup_bus_creds_unref_ sd_bus_creds *creds = NULL;
+ _cleanup_free_ char *p = NULL, *name = NULL;
+ const char *comm;
+ char **cmdline;
+ uid_t uid;
+ pid_t pid;
+ int r;
+
+ assert(a);
+ assert(b);
+
+ r = sd_bus_get_peer_creds(b, SD_BUS_CREDS_UID|SD_BUS_CREDS_PID|SD_BUS_CREDS_CMDLINE|SD_BUS_CREDS_COMM, &creds);
+ if (r < 0)
+ return r;
+
+ r = sd_bus_creds_get_uid(creds, &uid);
+ if (r < 0)
+ return r;
+
+ r = sd_bus_creds_get_pid(creds, &pid);
+ if (r < 0)
+ return r;
+
+ r = sd_bus_creds_get_cmdline(creds, &cmdline);
+ if (r < 0)
+ return r;
+
+ r = sd_bus_creds_get_comm(creds, &comm);
+ if (r < 0)
+ return r;
+
+ name = uid_to_name(uid);
+ if (!name)
+ return -ENOMEM;
+
+ p = strv_join(cmdline, " ");
+ if (!p)
+ return -ENOMEM;
+
+ /* The status string gets the full command line ... */
+ sd_notifyf(false,
+ "STATUS=Processing requests from client PID %lu (%s); UID %lu (%s)",
+ (unsigned long) pid, p,
+ (unsigned long) uid, name);
+
+ /* ... and the argv line only the short comm */
+ if (arg_command_line_buffer) {
+ size_t m, w;
+
+ m = strlen(arg_command_line_buffer);
+ w = snprintf(arg_command_line_buffer, m,
+ "[PID %lu/%s; UID %lu/%s]",
+ (unsigned long) pid, comm,
+ (unsigned long) uid, name);
+
+ if (m > w)
+ memset(arg_command_line_buffer + w, 0, m - w);
+ }
+
+ log_debug("Running on behalf of PID %lu (%s), UID %lu (%s), %s",
+ (unsigned long) pid, p,
+ (unsigned long) uid, name,
+ a->unique_name);
+ ;
+ return 0;
+}
+
+static int synthesize_name_acquired(sd_bus *a, sd_bus *b, sd_bus_message *m) {
+ _cleanup_bus_message_unref_ sd_bus_message *n = NULL;
+ const char *name, *old_owner, *new_owner;
+ int r;
+
+ assert(a);
+ assert(b);
+ assert(m);
+
+ /* If we get NameOwnerChanged for our own name, we need to
+ * synthesize NameLost/NameAcquired, since socket clients need
+ * that, even though it is obsoleted on kdbus */
+
+ if (!a->is_kernel)
+ return 0;
+
+ if (!sd_bus_message_is_signal(m, "org.freedesktop.DBus", "NameOwnerChanged") ||
+ !streq_ptr(m->path, "/org/freedesktop/DBus") ||
+ !streq_ptr(m->sender, "org.freedesktop.DBus"))
+ return 0;
+
+ r = sd_bus_message_read(m, "sss", &name, &old_owner, &new_owner);
+ if (r < 0)
+ return r;
+
+ r = sd_bus_message_rewind(m, true);
+ if (r < 0)
+ return r;
+
+ if (streq(old_owner, a->unique_name)) {
+
+ r = sd_bus_message_new_signal(
+ b,
+ "/org/freedesktop/DBus",
+ "org.freedesktop.DBus",
+ "NameLost",
+ &n);
+
+ } else if (streq(new_owner, a->unique_name)) {
+
+ r = sd_bus_message_new_signal(
+ b,
+ "/org/freedesktop/DBus",
+ "org.freedesktop.DBus",
+ "NameAcquired",
+ &n);
+ } else
+ return 0;
+
+ if (r < 0)
+ return r;
+
+ r = sd_bus_message_append(n, "s", name);
+ if (r < 0)
+ return r;
+
+ r = bus_message_append_sender(n, "org.freedesktop.DBus");
+ if (r < 0)
+ return r;
+
+ r = bus_seal_synthetic_message(b, n);
+ if (r < 0)
+ return r;
+
+ return sd_bus_send(b, n, NULL);
+}
+
+static int process_policy(sd_bus *a, sd_bus *b, sd_bus_message *m) {
+ _cleanup_bus_message_unref_ sd_bus_message *n = NULL;
+ int r;
+
+ assert(a);
+ assert(b);
+ assert(m);
+
+ if (!sd_bus_message_is_method_call(m, "org.freedesktop.DBus.Properties", "GetAll"))
+ return 0;
+
+ if (!streq_ptr(m->path, "/org/gnome/DisplayManager/Slave"))
+ return 0;
+
+ r = sd_bus_message_new_method_errorf(m, &n, SD_BUS_ERROR_ACCESS_DENIED, "gdm, you are stupid");
+ if (r < 0)
+ return r;
+
+ r = bus_message_append_sender(n, "org.freedesktop.DBus");
+ if (r < 0) {
+ log_error("Failed to append sender to gdm reply: %s", strerror(-r));
+ return r;
+ }
+
+ r = bus_seal_synthetic_message(b, n);
+ if (r < 0) {
+ log_error("Failed to seal gdm reply: %s", strerror(-r));
+ return r;
+ }
+
+ r = sd_bus_send(b, n, NULL);
+ if (r < 0) {
+ log_error("Failed to send gdm reply: %s", strerror(-r));
+ return r;
+ }
+
+ return 1;
+}
+
+static int process_hello(sd_bus *a, sd_bus *b, sd_bus_message *m, bool *got_hello) {
+ _cleanup_bus_message_unref_ sd_bus_message *n = NULL;
+ bool is_hello;
+ int r;
+
+ assert(a);
+ assert(b);
+ assert(m);
+ assert(got_hello);
+
+ /* As reaction to hello we need to respond with two messages:
+ * the callback reply and the NameAcquired for the unique
+ * name, since hello is otherwise obsolete on kdbus. */
+
+ is_hello =
+ sd_bus_message_is_method_call(m, "org.freedesktop.DBus", "Hello") &&
+ streq_ptr(m->destination, "org.freedesktop.DBus");
+
+ if (!is_hello) {
+
+ if (*got_hello)
+ return 0;
+
+ log_error("First packet isn't hello (it's %s.%s), aborting.", m->interface, m->member);
+ return -EIO;
+ }
+
+ if (*got_hello) {
+ log_error("Got duplicate hello, aborting.");
+ return -EIO;
+ }
+
+ *got_hello = true;
+
+ if (!a->is_kernel)
+ return 0;
+
+ r = sd_bus_message_new_method_return(m, &n);
+ if (r < 0) {
+ log_error("Failed to generate HELLO reply: %s", strerror(-r));
+ return r;
+ }
+
+ r = sd_bus_message_append(n, "s", a->unique_name);
+ if (r < 0) {
+ log_error("Failed to append unique name to HELLO reply: %s", strerror(-r));
+ return r;
+ }
+
+ r = bus_message_append_sender(n, "org.freedesktop.DBus");
+ if (r < 0) {
+ log_error("Failed to append sender to HELLO reply: %s", strerror(-r));
+ return r;
+ }
+
+ r = bus_seal_synthetic_message(b, n);
+ if (r < 0) {
+ log_error("Failed to seal HELLO reply: %s", strerror(-r));
+ return r;
+ }
+
+ r = sd_bus_send(b, n, NULL);
+ if (r < 0) {
+ log_error("Failed to send HELLO reply: %s", strerror(-r));
+ return r;
+ }
+
+ n = sd_bus_message_unref(n);
+ r = sd_bus_message_new_signal(
+ b,
+ "/org/freedesktop/DBus",
+ "org.freedesktop.DBus",
+ "NameAcquired",
+ &n);
+ if (r < 0) {
+ log_error("Failed to allocate initial NameAcquired message: %s", strerror(-r));
+ return r;
+ }
+
+ r = sd_bus_message_append(n, "s", a->unique_name);
+ if (r < 0) {
+ log_error("Failed to append unique name to NameAcquired message: %s", strerror(-r));
+ return r;
+ }
+
+ r = bus_message_append_sender(n, "org.freedesktop.DBus");
+ if (r < 0) {
+ log_error("Failed to append sender to NameAcquired message: %s", strerror(-r));
+ return r;
+ }
+
+ r = bus_seal_synthetic_message(b, n);
+ if (r < 0) {
+ log_error("Failed to seal NameAcquired message: %s", strerror(-r));
+ return r;
+ }
+
+ r = sd_bus_send(b, n, NULL);
+ if (r < 0) {
+ log_error("Failed to send NameAcquired message: %s", strerror(-r));
+ return r;
+ }
+
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;
+ bool got_hello = false;
+ bool is_unix;
+ struct ucred ucred = {};
+ _cleanup_free_ char *peersec = NULL;
log_set_target(LOG_TARGET_JOURNAL_OR_KMSG);
log_parse_environment();
in_fd = SD_LISTEN_FDS_START;
out_fd = SD_LISTEN_FDS_START;
} else {
- log_error("Illegal number of file descriptors passed\n");
+ log_error("Illegal number of file descriptors passed");
goto finish;
}
sd_is_socket(in_fd, AF_UNIX, 0, 0) > 0 &&
sd_is_socket(out_fd, AF_UNIX, 0, 0) > 0;
+ if (is_unix) {
+ getpeercred(in_fd, &ucred);
+ getpeersec(in_fd, &peersec);
+ }
+
r = sd_bus_new(&a);
if (r < 0) {
log_error("Failed to allocate bus: %s", strerror(-r));
goto finish;
}
+ if (ucred.pid > 0) {
+ a->fake_creds.pid = ucred.pid;
+ a->fake_creds.uid = ucred.uid;
+ a->fake_creds.gid = ucred.gid;
+ a->fake_creds_valid = true;
+ }
+
+ if (peersec) {
+ a->fake_label = peersec;
+ peersec = NULL;
+ }
+
+ a->manual_peer_interface = true;
+
r = sd_bus_start(a);
if (r < 0) {
log_error("Failed to start bus client: %s", strerror(-r));
goto finish;
}
+ b->manual_peer_interface = true;
+
r = sd_bus_start(b);
if (r < 0) {
log_error("Failed to start bus client: %s", strerror(-r));
goto finish;
}
+ r = rename_service(a, b);
+ if (r < 0)
+ log_debug("Failed to rename process: %s", strerror(-r));
+
+ if (a->is_kernel) {
+ _cleanup_free_ char *match = NULL;
+ const char *unique;
+
+ r = sd_bus_get_unique_name(a, &unique);
+ if (r < 0) {
+ log_error("Failed to get unique name: %s", strerror(-r));
+ goto finish;
+ }
+
+ match = strjoin("type='signal',"
+ "sender='org.freedesktop.DBus',"
+ "path='/org/freedesktop/DBus',"
+ "interface='org.freedesktop.DBus',"
+ "member='NameOwnerChanged',"
+ "arg1='",
+ unique,
+ "'",
+ NULL);
+ if (!match) {
+ log_oom();
+ goto finish;
+ }
+
+ r = sd_bus_add_match(a, match, NULL, NULL);
+ if (r < 0) {
+ log_error("Failed to add match for NameLost: %s", strerror(-r));
+ goto finish;
+ }
+
+ free(match);
+ match = strjoin("type='signal',"
+ "sender='org.freedesktop.DBus',"
+ "path='/org/freedesktop/DBus',"
+ "interface='org.freedesktop.DBus',"
+ "member='NameOwnerChanged',"
+ "arg2='",
+ unique,
+ "'",
+ NULL);
+ if (!match) {
+ log_oom();
+ goto finish;
+ }
+
+ r = sd_bus_add_match(a, match, NULL, NULL);
+ if (r < 0) {
+ log_error("Failed to add match for NameAcquired: %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;
+ struct pollfd *pollfd;
+ int k;
- 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 (got_hello) {
+ r = sd_bus_process(a, &m);
if (r < 0) {
- log_error("Failed to send message: %s", strerror(-r));
+ /* treat 'connection reset by peer' as clean exit condition */
+ if (r == -ECONNRESET)
+ r = 0;
+ else
+ log_error("Failed to process bus a: %s", strerror(-r));
+
goto finish;
}
- }
- if (r > 0)
- continue;
+ if (m) {
+ /* We officially got EOF, let's quit */
+ if (sd_bus_message_is_signal(m, "org.freedesktop.DBus.Local", "Disconnected")) {
+ r = 0;
+ goto finish;
+ }
+
+ k = synthesize_name_acquired(a, b, m);
+ if (k < 0) {
+ r = k;
+ log_error("Failed to synthesize message: %s", strerror(-r));
+ goto finish;
+ }
+
+ k = sd_bus_send(b, m, NULL);
+ if (k < 0) {
+ r = k;
+ 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;
+ else
+ log_error("Failed to process bus b: %s", strerror(-r));
goto finish;
}
if (m) {
- r = sd_bus_send(a, m, NULL);
- if (r < 0) {
- log_error("Failed to send message: %s", strerror(-r));
+ /* We officially got EOF, let's quit */
+ if (sd_bus_message_is_signal(m, "org.freedesktop.DBus.Local", "Disconnected")) {
+ r = 0;
+ goto finish;
+ }
+
+ k = process_hello(a, b, m, &got_hello);
+ if (k < 0) {
+ r = k;
goto finish;
}
+
+ if (k > 0)
+ r = k;
+ else {
+ k = process_policy(a, b, m);
+ if (k < 0) {
+ r = k;
+ goto finish;
+ }
+
+ k = sd_bus_send(a, m, NULL);
+ if (k < 0) {
+ r = k;
+ log_error("Failed to send message: %s", strerror(-r));
+ goto finish;
+ }
+ }
}
if (r > 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, }};
+ pollfd = (struct pollfd[3]) {
+ {.fd = fd, .events = events_a, },
+ {.fd = in_fd, .events = events_b & POLLIN, },
+ {.fd = out_fd, .events = events_b & POLLOUT, }
+ };
- r = ppoll(p, ELEMENTSOF(p), ts, NULL);
- }
+ r = ppoll(pollfd, 3, ts, NULL);
if (r < 0) {
log_error("ppoll() failed: %m");
goto finish;
r = 0;
finish:
+ sd_bus_flush(a);
+ sd_bus_flush(b);
+
return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;
}
~ianmdlvl / elogind.git / blobdiff