_public_ int sd_bus_query_sender_creds(sd_bus_message *call, uint64_t mask, sd_bus_creds **creds) {
sd_bus_creds *c;
assert_return(call, -EINVAL);
assert_return(call->sealed, -EPERM);
assert_return(call->bus, -EINVAL);
assert_return(!bus_pid_changed(call->bus), -ECHILD);
if (!BUS_IS_OPEN(call->bus->state))
return -ENOTCONN;
c = sd_bus_message_get_creds(call);
/* All data we need? */
if (c && (mask & ~c->mask) == 0) {
*creds = sd_bus_creds_ref(c);
return 0;
}
/* No data passed? Or not enough data passed to retrieve the missing bits? */
if (!c || !(c->mask & SD_BUS_CREDS_PID)) {
/* We couldn't read anything from the call, let's try
* to get it from the sender or peer. */
if (call->sender)
/* There's a sender, but the creds are
* missing. This means we are talking via
* dbus1, or are getting a message that was
* sent to us via kdbus, but was converted
* from a dbus1 message by the bus-proxy and
* thus also lacks the creds. */
return sd_bus_get_name_creds(call->bus, call->sender, mask, creds);
else
/* There's no sender, hence we are on a dbus1
* direct connection. For direct connections
* the credentials of the AF_UNIX peer matter,
* which may be queried via
* sd_bus_get_owner_creds(). */
return sd_bus_get_owner_creds(call->bus, mask, creds);
}
return bus_creds_extend_by_pid(c, mask, creds);
}
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_owner_creds(b, SD_BUS_CREDS_EUID|SD_BUS_CREDS_PID|SD_BUS_CREDS_CMDLINE|SD_BUS_CREDS_COMM|SD_BUS_CREDS_AUGMENT, &creds);
if (r < 0)
return r;
r = sd_bus_creds_get_euid(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 "PID_FMT" (%s); UID "UID_FMT" (%s)",
pid, p,
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 "PID_FMT"/%s; UID "UID_FMT"/%s]",
pid, comm,
uid, name);
if (m > w)
memzero(arg_command_line_buffer + w, m - w);
}
log_debug("Running on behalf of PID "PID_FMT" (%s), UID "UID_FMT" (%s), %s",
pid, p,
uid, name,
a->unique_name);
return 0;
}