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)

Debian                                            May 25, 2018                                  FIDO_DEV_OPEN(3)