FIDO_DEV_OPEN(3)

NAME
fido_dev_open, fido_dev_close, fido_dev_cancel, fido_dev_new, 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_pin, fido_dev_has_pin, fido_dev_supports_uv, fido_dev_has_uv, fido_dev_protocol, fido_dev_build, fido_dev_flags, fido_dev_major, fido_dev_minor - FIDO 2 device open/close and related functions

SYNOPSIS
#include <fido.h>
int
fido_dev_open(fido_dev_t *dev, const char *path);
int
fido_dev_close(fido_dev_t *dev);
int
fido_dev_cancel(fido_dev_t *dev);
fido_dev_t *
fido_dev_new(void);
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_pin(const fido_dev_t *dev);
bool
fido_dev_has_pin(const fido_dev_t *dev);
bool
fido_dev_supports_uv(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_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_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.

The fido_dev_force_u2f() function can be used to force CTAP1 (U2F) communication with dev.

The fido_dev_is_fido2() function returns true if dev is a FIDO 2 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 FIDO 2.1 Credential Management.

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

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

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

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

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() 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)