NAME

     fido_dev_open, fido_dev_open_with_info, fido_dev_close, fido_dev_cancel, fido_dev_new,
     fido_dev_new_with_info, fido_dev_free, fido_dev_force_fido2, fido_dev_force_u2f,
     fido_dev_is_fido2, fido_dev_is_winhello, fido_dev_supports_credman,
     fido_dev_supports_cred_prot, fido_dev_supports_permissions, fido_dev_supports_pin,
     fido_dev_supports_uv, fido_dev_has_pin, fido_dev_has_uv, fido_dev_protocol, fido_dev_build,
     fido_dev_flags, fido_dev_major, fido_dev_minor — FIDO2 device open/close and related
     functions

SYNOPSIS

     #include <fido.h>

     int
     fido_dev_open(fido_dev_t *dev, const char *path);

     int
     fido_dev_open_with_info(fido_dev_t *dev);

     int
     fido_dev_close(fido_dev_t *dev);

     int
     fido_dev_cancel(fido_dev_t *dev);

     fido_dev_t *
     fido_dev_new(void);

     fido_dev_t *
     fido_dev_new_with_info(const fido_dev_info_t *);

     void
     fido_dev_free(fido_dev_t **dev_p);

     void
     fido_dev_force_fido2(fido_dev_t *dev);

     void
     fido_dev_force_u2f(fido_dev_t *dev);

     bool
     fido_dev_is_fido2(const fido_dev_t *dev);

     bool
     fido_dev_is_winhello(const fido_dev_t *dev);

     bool
     fido_dev_supports_credman(const fido_dev_t *dev);

     bool
     fido_dev_supports_cred_prot(const fido_dev_t *dev);

     bool
     fido_dev_supports_permissions(const fido_dev_t *dev);

     bool
     fido_dev_supports_pin(const fido_dev_t *dev);

     bool
     fido_dev_supports_uv(const fido_dev_t *dev);

     bool
     fido_dev_has_pin(const fido_dev_t *dev);

     bool
     fido_dev_has_uv(const fido_dev_t *dev);

     uint8_t
     fido_dev_protocol(const fido_dev_t *dev);

     uint8_t
     fido_dev_build(const fido_dev_t *dev);

     uint8_t
     fido_dev_flags(const fido_dev_t *dev);

     uint8_t
     fido_dev_major(const fido_dev_t *dev);

     uint8_t
     fido_dev_minor(const fido_dev_t *dev);

DESCRIPTION

     The fido_dev_open() function opens the device pointed to by path, where dev is a freshly
     allocated or otherwise closed fido_dev_t.  If dev claims to be FIDO2, libfido2 will attempt
     to speak FIDO2 to dev.  If that fails, libfido2 will fallback to U2F unless the
     FIDO_DISABLE_U2F_FALLBACK flag was set in fido_init(3).

     The fido_dev_open_with_info() function opens dev as previously allocated using
     fido_dev_new_with_info().

     The fido_dev_close() function closes the device represented by dev.  If dev is already
     closed, fido_dev_close() is a NOP.

     The fido_dev_cancel() function cancels any pending requests on dev.

     The fido_dev_new() function returns a pointer to a newly allocated, empty fido_dev_t.  If
     memory cannot be allocated, NULL is returned.

     The fido_dev_new_with_info() function returns a pointer to a newly allocated fido_dev_t with
     fido_dev_info_t parameters, for use with fido_dev_info_manifest(3) and
     fido_dev_open_with_info().  If memory cannot be allocated, NULL is returned.

     The fido_dev_free() function releases the memory backing *dev_p, where *dev_p must have been
     previously allocated by fido_dev_new().  On return, *dev_p is set to NULL.  Either dev_p or
     *dev_p may be NULL, in which case fido_dev_free() is a NOP.

     The fido_dev_force_fido2() function can be used to force CTAP2 communication with dev, where
     dev is an open device.

     The fido_dev_force_u2f() function can be used to force CTAP1 (U2F) communication with dev,
     where dev is an open device.

     The fido_dev_is_fido2() function returns true if dev is a FIDO2 device.

     The fido_dev_is_winhello() function returns true if dev is a Windows Hello device.

     The fido_dev_supports_credman() function returns true if dev supports CTAP 2.1 Credential
     Management.

     The fido_dev_supports_cred_prot() function returns true if dev supports CTAP 2.1 Credential
     Protection.

     The fido_dev_supports_permissions() function returns true if dev supports CTAP 2.1 UV token
     permissions.

     The fido_dev_supports_pin() function returns true if dev supports CTAP 2.0 Client PINs.

     The fido_dev_supports_uv() function returns true if dev supports a built-in user
     verification method.

     The fido_dev_has_pin() function returns true if dev has a CTAP 2.0 Client PIN set.

     The fido_dev_has_uv() function returns true if dev supports built-in user verification and
     its user verification feature is configured.

     The fido_dev_protocol() function returns the CTAPHID protocol version identifier of dev.

     The fido_dev_build() function returns the CTAPHID build version number of dev.

     The fido_dev_flags() function returns the CTAPHID capabilities flags of dev.

     The fido_dev_major() function returns the CTAPHID major version number of dev.

     The fido_dev_minor() function returns the CTAPHID minor version number of dev.

     For the format and meaning of the CTAPHID parameters returned by functions above, please
     refer to the FIDO Client to Authenticator Protocol (CTAP) specification.

RETURN VALUES

     On success, fido_dev_open(), fido_dev_open_with_info(), and fido_dev_close() return FIDO_OK.
     On error, a different error code defined in <fido/err.h> is returned.

SEE ALSO

     fido_dev_info_manifest(3), fido_dev_set_io_functions(3), fido_init(3)