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   sd_bus_query_sender_privilege    ( 3 )

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Имя (Name)

sd_bus_query_sender_creds, sd_bus_query_sender_privilege - Query
       bus message sender credentials/privileges

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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);

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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.

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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.

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Примечание (Note)

These APIs are implemented as a shared library, which can be
       compiled and linked to with the libsystemd pkg-config(1) file.

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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)

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