учетные данные / права отправителя сообщения шины запроса (Query bus message sender credentials/privileges)
Имя (Name)
sd_bus_query_sender_creds, sd_bus_query_sender_privilege - Query
bus message sender credentials/privileges
Синопсис (Synopsis)
#include <systemd/sd-bus.h>
int sd_bus_query_sender_creds(sd_bus_message *m, uint64_t mask,
sd_bus_creds **creds);
sd_bus_error* sd_bus_query_sender_privilege(sd_bus_message *m,
int capability);
Описание (Description)
sd_bus_query_sender_creds() returns the credentials of the
message m. The mask parameter is a combo of SD_BUS_CREDS_* flags
that indicate which credential info the caller is interested in.
See sd_bus_creds_new_from_pid(3) for a list of possible flags.
First, this message checks if the requested credentials are
attached to the message itself. If not, but the message contains
the pid of the sender and the caller specified the
SD_BUS_CREDS_AUGMENT flag, this function tries to figure out the
missing credentials via other means (starting from the pid). If
the pid isn't available but the message has a sender, this
function calls sd_bus_get_name_creds(3) to get the requested
credentials. If the message has no sender (when a direct
connection is used), this function calls
sd_bus_get_owner_creds(3) to get the requested credentials. On
success, the requested credentials are stored in creds. Ownership
of the credentials object in creds is transferred to the caller
and should be freed by calling sd_bus_creds_unref(3).
sd_bus_query_sender_privilege() checks if the message m has the
requested privileges. If capability is a non-negative integer,
this function checks if the message has the capability with the
same value. See capabilities(7) for a list of capabilities. If
capability is a negative integer, this function returns whether
the sender of the message runs as the same user as the receiver
of the message, or if the sender of the message runs as root and
the receiver of the message does not run as root. On success and
if the message has the requested privileges, this function
returns a positive integer. If the message does not have the
requested privileges, this function returns zero.
Возвращаемое значение (Return value)
On success, these functions return a non-negative integer. On
failure, they return a negative errno-style error code.
Errors
Returned errors may indicate the following problems:
-EINVAL
The message m or an output parameter is NULL.
-ENOTCONN
The bus of m is not connected.
-ECHILD
The bus of m was created in a different process.
-EPERM
The message m is not sealed.
Примечание (Note)
These APIs are implemented as a shared library, which can be
compiled and linked to with the libsystemd pkg-config(1) file.
Смотри также (See also)
systemd(1), sd-bus(3), sd_bus_creds_new_from_pid(3),
sd_bus_get_name_creds(3), sd_bus_get_owner_creds(3),
sd_bus_creds_unref(3), capabilities(7)
