2 * Copyright (c) 2019 Yubico AB. All rights reserved.
3 * Use of this source code is governed by a BSD-style
4 * license that can be found in the LICENSE file.
11 #include <linux/hidraw.h>
12 #include <linux/input.h>
24 size_t report_out_len;
26 const sigset_t *sigmaskp;
30 get_report_descriptor(int fd, struct hidraw_report_descriptor *hrd)
34 if (ioctl(fd, IOCTL_REQ(HIDIOCGRDESCSIZE), &s) == -1) {
35 fido_log_error(errno, "%s: ioctl HIDIOCGRDESCSIZE", __func__);
39 if (s < 0 || (unsigned)s > HID_MAX_DESCRIPTOR_SIZE) {
40 fido_log_debug("%s: HIDIOCGRDESCSIZE %d", __func__, s);
44 hrd->size = (unsigned)s;
46 if (ioctl(fd, IOCTL_REQ(HIDIOCGRDESC), hrd) == -1) {
47 fido_log_error(errno, "%s: ioctl HIDIOCGRDESC", __func__);
55 is_fido(const char *path)
58 uint32_t usage_page = 0;
59 struct hidraw_report_descriptor hrd;
61 memset(&hrd, 0, sizeof(hrd));
63 if ((fd = fido_hid_unix_open(path)) == -1)
66 if (get_report_descriptor(fd, &hrd) < 0 ||
67 fido_hid_get_usage(hrd.value, hrd.size, &usage_page) < 0)
71 fido_log_error(errno, "%s: close", __func__);
73 return (usage_page == 0xf1d0);
77 parse_uevent(const char *uevent, int *bus, int16_t *vendor_id,
88 if ((s = cp = strdup(uevent)) == NULL)
91 while ((p = strsep(&cp, "\n")) != NULL && *p != '\0') {
92 if (strncmp(p, "HID_ID=", 7) == 0) {
93 if (sscanf(p + 7, "%hx:%hx:%hx", &x, &y, &z) == 3) {
95 *vendor_id = (int16_t)y;
96 *product_id = (int16_t)z;
109 get_parent_attr(struct udev_device *dev, const char *subsystem,
110 const char *devtype, const char *attr)
112 struct udev_device *parent;
115 if ((parent = udev_device_get_parent_with_subsystem_devtype(dev,
116 subsystem, devtype)) == NULL || (value =
117 udev_device_get_sysattr_value(parent, attr)) == NULL)
120 return (strdup(value));
124 get_usb_attr(struct udev_device *dev, const char *attr)
126 return (get_parent_attr(dev, "usb", "usb_device", attr));
130 copy_info(fido_dev_info_t *di, struct udev *udev,
131 struct udev_list_entry *udev_entry)
136 struct udev_device *dev = NULL;
140 memset(di, 0, sizeof(*di));
142 if ((name = udev_list_entry_get_name(udev_entry)) == NULL ||
143 (dev = udev_device_new_from_syspath(udev, name)) == NULL ||
144 (path = udev_device_get_devnode(dev)) == NULL ||
148 if ((uevent = get_parent_attr(dev, "hid", NULL, "uevent")) == NULL ||
149 parse_uevent(uevent, &bus, &di->vendor_id, &di->product_id) < 0) {
150 fido_log_debug("%s: uevent", __func__);
155 if (bus != BUS_USB) {
156 fido_log_debug("%s: bus", __func__);
161 di->path = strdup(path);
162 if ((di->manufacturer = get_usb_attr(dev, "manufacturer")) == NULL)
163 di->manufacturer = strdup("unknown");
164 if ((di->product = get_usb_attr(dev, "product")) == NULL)
165 di->product = strdup("unknown");
166 if (di->path == NULL || di->manufacturer == NULL || di->product == NULL)
172 udev_device_unref(dev);
178 free(di->manufacturer);
180 explicit_bzero(di, sizeof(*di));
187 fido_hid_manifest(fido_dev_info_t *devlist, size_t ilen, size_t *olen)
189 struct udev *udev = NULL;
190 struct udev_enumerate *udev_enum = NULL;
191 struct udev_list_entry *udev_list;
192 struct udev_list_entry *udev_entry;
193 int r = FIDO_ERR_INTERNAL;
198 return (FIDO_OK); /* nothing to do */
201 return (FIDO_ERR_INVALID_ARGUMENT);
203 if ((udev = udev_new()) == NULL ||
204 (udev_enum = udev_enumerate_new(udev)) == NULL)
207 if (udev_enumerate_add_match_subsystem(udev_enum, "hidraw") < 0 ||
208 udev_enumerate_scan_devices(udev_enum) < 0)
211 if ((udev_list = udev_enumerate_get_list_entry(udev_enum)) == NULL) {
212 r = FIDO_OK; /* zero hidraw devices */
216 udev_list_entry_foreach(udev_entry, udev_list) {
217 if (copy_info(&devlist[*olen], udev, udev_entry) == 0) {
218 devlist[*olen].io = (fido_dev_io_t) {
224 if (++(*olen) == ilen)
231 if (udev_enum != NULL)
232 udev_enumerate_unref(udev_enum);
240 fido_hid_open(const char *path)
242 struct hid_linux *ctx;
243 struct hidraw_report_descriptor hrd;
244 struct timespec tv_pause;
245 long interval_ms, retries = 0;
247 if ((ctx = calloc(1, sizeof(*ctx))) == NULL ||
248 (ctx->fd = fido_hid_unix_open(path)) == -1) {
253 while (flock(ctx->fd, LOCK_EX|LOCK_NB) == -1) {
254 if (errno != EWOULDBLOCK) {
255 fido_log_error(errno, "%s: flock", __func__);
259 if (retries++ >= 15) {
260 fido_log_debug("%s: flock timeout", __func__);
264 interval_ms = retries * 100000000L;
265 tv_pause.tv_sec = interval_ms / 1000000000L;
266 tv_pause.tv_nsec = interval_ms % 1000000000L;
267 if (nanosleep(&tv_pause, NULL) == -1) {
268 fido_log_error(errno, "%s: nanosleep", __func__);
274 if (get_report_descriptor(ctx->fd, &hrd) < 0 ||
275 fido_hid_get_report_len(hrd.value, hrd.size, &ctx->report_in_len,
276 &ctx->report_out_len) < 0 || ctx->report_in_len == 0 ||
277 ctx->report_out_len == 0) {
278 fido_log_debug("%s: using default report sizes", __func__);
279 ctx->report_in_len = CTAP_MAX_REPORT_LEN;
280 ctx->report_out_len = CTAP_MAX_REPORT_LEN;
287 fido_hid_close(void *handle)
289 struct hid_linux *ctx = handle;
291 if (close(ctx->fd) == -1)
292 fido_log_error(errno, "%s: close", __func__);
298 fido_hid_set_sigmask(void *handle, const fido_sigset_t *sigmask)
300 struct hid_linux *ctx = handle;
302 ctx->sigmask = *sigmask;
303 ctx->sigmaskp = &ctx->sigmask;
309 fido_hid_read(void *handle, unsigned char *buf, size_t len, int ms)
311 struct hid_linux *ctx = handle;
314 if (len != ctx->report_in_len) {
315 fido_log_debug("%s: len %zu", __func__, len);
319 if (fido_hid_unix_wait(ctx->fd, ms, ctx->sigmaskp) < 0) {
320 fido_log_debug("%s: fd not ready", __func__);
324 if ((r = read(ctx->fd, buf, len)) == -1) {
325 fido_log_error(errno, "%s: read", __func__);
329 if (r < 0 || (size_t)r != len) {
330 fido_log_debug("%s: %zd != %zu", __func__, r, len);
338 fido_hid_write(void *handle, const unsigned char *buf, size_t len)
340 struct hid_linux *ctx = handle;
343 if (len != ctx->report_out_len + 1) {
344 fido_log_debug("%s: len %zu", __func__, len);
348 if ((r = write(ctx->fd, buf, len)) == -1) {
349 fido_log_error(errno, "%s: write", __func__);
353 if (r < 0 || (size_t)r != len) {
354 fido_log_debug("%s: %zd != %zu", __func__, r, len);
362 fido_hid_report_in_len(void *handle)
364 struct hid_linux *ctx = handle;
366 return (ctx->report_in_len);
370 fido_hid_report_out_len(void *handle)
372 struct hid_linux *ctx = handle;
374 return (ctx->report_out_len);