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Diffstat (limited to '')
| -rw-r--r-- | src/hid.c | 222 |
1 files changed, 222 insertions, 0 deletions
diff --git a/src/hid.c b/src/hid.c new file mode 100644 index 0000000..662bd44 --- /dev/null +++ b/src/hid.c @@ -0,0 +1,222 @@ +/* + * Copyright (c) 2018 Yubico AB. All rights reserved. + * Use of this source code is governed by a BSD-style + * license that can be found in the LICENSE file. + * SPDX-License-Identifier: BSD-2-Clause + */ + +#include "fido.h" + +static int +get_key_len(uint8_t tag, uint8_t *key, size_t *key_len) +{ + *key = tag & 0xfc; + if ((*key & 0xf0) == 0xf0) { + fido_log_debug("%s: *key=0x%02x", __func__, *key); + return (-1); + } + + *key_len = tag & 0x3; + if (*key_len == 3) { + *key_len = 4; + } + + return (0); +} + +static int +get_key_val(const void *body, size_t key_len, uint32_t *val) +{ + const uint8_t *ptr = body; + + switch (key_len) { + case 0: + *val = 0; + break; + case 1: + *val = ptr[0]; + break; + case 2: + *val = (uint32_t)((ptr[1] << 8) | ptr[0]); + break; + default: + fido_log_debug("%s: key_len=%zu", __func__, key_len); + return (-1); + } + + return (0); +} + +int +fido_hid_get_usage(const uint8_t *report_ptr, size_t report_len, + uint32_t *usage_page) +{ + const uint8_t *ptr = report_ptr; + size_t len = report_len; + + while (len > 0) { + const uint8_t tag = ptr[0]; + ptr++; + len--; + + uint8_t key; + size_t key_len; + uint32_t key_val; + + if (get_key_len(tag, &key, &key_len) < 0 || key_len > len || + get_key_val(ptr, key_len, &key_val) < 0) { + return (-1); + } + + if (key == 0x4) { + *usage_page = key_val; + } + + ptr += key_len; + len -= key_len; + } + + return (0); +} + +int +fido_hid_get_report_len(const uint8_t *report_ptr, size_t report_len, + size_t *report_in_len, size_t *report_out_len) +{ + const uint8_t *ptr = report_ptr; + size_t len = report_len; + uint32_t report_size = 0; + + while (len > 0) { + const uint8_t tag = ptr[0]; + ptr++; + len--; + + uint8_t key; + size_t key_len; + uint32_t key_val; + + if (get_key_len(tag, &key, &key_len) < 0 || key_len > len || + get_key_val(ptr, key_len, &key_val) < 0) { + return (-1); + } + + if (key == 0x94) { + report_size = key_val; + } else if (key == 0x80) { + *report_in_len = (size_t)report_size; + } else if (key == 0x90) { + *report_out_len = (size_t)report_size; + } + + ptr += key_len; + len -= key_len; + } + + return (0); +} + +fido_dev_info_t * +fido_dev_info_new(size_t n) +{ + return (calloc(n, sizeof(fido_dev_info_t))); +} + +static void +fido_dev_info_reset(fido_dev_info_t *di) +{ + free(di->path); + free(di->manufacturer); + free(di->product); + memset(di, 0, sizeof(*di)); +} + +void +fido_dev_info_free(fido_dev_info_t **devlist_p, size_t n) +{ + fido_dev_info_t *devlist; + + if (devlist_p == NULL || (devlist = *devlist_p) == NULL) + return; + + for (size_t i = 0; i < n; i++) + fido_dev_info_reset(&devlist[i]); + + free(devlist); + + *devlist_p = NULL; +} + +const fido_dev_info_t * +fido_dev_info_ptr(const fido_dev_info_t *devlist, size_t i) +{ + return (&devlist[i]); +} + +int +fido_dev_info_set(fido_dev_info_t *devlist, size_t i, + const char *path, const char *manufacturer, const char *product, + const fido_dev_io_t *io, const fido_dev_transport_t *transport) +{ + char *path_copy = NULL, *manu_copy = NULL, *prod_copy = NULL; + int r; + + if (path == NULL || manufacturer == NULL || product == NULL || + io == NULL) { + r = FIDO_ERR_INVALID_ARGUMENT; + goto out; + } + + if ((path_copy = strdup(path)) == NULL || + (manu_copy = strdup(manufacturer)) == NULL || + (prod_copy = strdup(product)) == NULL) { + r = FIDO_ERR_INTERNAL; + goto out; + } + + fido_dev_info_reset(&devlist[i]); + devlist[i].path = path_copy; + devlist[i].manufacturer = manu_copy; + devlist[i].product = prod_copy; + devlist[i].io = *io; + if (transport) + devlist[i].transport = *transport; + r = FIDO_OK; +out: + if (r != FIDO_OK) { + free(prod_copy); + free(manu_copy); + free(path_copy); + } + return (r); +} + +const char * +fido_dev_info_path(const fido_dev_info_t *di) +{ + return (di->path); +} + +int16_t +fido_dev_info_vendor(const fido_dev_info_t *di) +{ + return (di->vendor_id); +} + +int16_t +fido_dev_info_product(const fido_dev_info_t *di) +{ + return (di->product_id); +} + +const char * +fido_dev_info_manufacturer_string(const fido_dev_info_t *di) +{ + return (di->manufacturer); +} + +const char * +fido_dev_info_product_string(const fido_dev_info_t *di) +{ + return (di->product); +} |