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#include <stdio.h>
#include <fcntl.h>
#include <unistd.h>
#include <string.h>
#include <strings.h>
#include <sys/types.h>
#include <linux/input.h>
#ifndef GPIO
#define GPIO 4
#endif
#define STRINGIFY(a) #a
#define STRINGIFY_HARDER(a) STRINGIFY(a)
#define GPIO_STR STRINGIFY_HARDER(GPIO)
char *names[KEY_MAX + 1] =
{ "", "", "1", "2", "3", "4", "5", "6", "7", "8", "9", "0", "-", "=", "",
"\t", "q", "w", "e", "r", "t", "y", "u", "i", "o", "p", "[", "]", "", "",
"a", "s", "d", "f", "g",
"h", "j", "k", "l", ";", "'", "`", "", "\\", "z", "x", "c", "v", "b", "n",
"m", ",", ".",
"/"
};
static char *
strcasestr (const char *haystack, const char *needle)
{
size_t len = strlen (needle);
for (; *haystack; haystack++)
{
if (!strncasecmp (haystack, needle, len))
return (char *) haystack;
}
return NULL;
}
static int
squirt (const char *fn, const char *content)
{
size_t len = strlen (content);
int fd = open (fn, O_WRONLY);
int ret = -1;
if (fd < 0)
return ret;
if (write (fd, content, len) == len)
ret = 0;
close (fd);
return ret;
}
int
open_ykhid (void)
{
#define MAX_DEV 64
char name[128];
unsigned i;
int fd;
for (i = 0; i < MAX_DEV; ++i)
{
sprintf (name, "/dev/input/event%d", i);
fd = open (name, O_RDWR);
if (fd < 0)
continue;
ioctl (fd, EVIOCGNAME (sizeof (name)), name);
name[sizeof (name) - 1] = 0;
if (strcasestr (name, "yubikey"))
return fd;
close (fd);
}
return -1;
}
static int
get_string_with_timeout (int fd, struct timeval *tv, char *buf,
size_t buf_len)
{
fd_set rfds;
struct input_event ev;
if (buf_len)
buf_len--;
FD_ZERO (&rfds);
for (;;)
{
FD_SET (fd, &rfds);
if (select (fd + 1, &rfds, NULL, NULL, tv) < 1)
break;
if (read (fd, &ev, sizeof (struct input_event)) !=
sizeof (struct input_event))
continue;
if (ev.type != EV_KEY)
continue;
if (buf_len && ev.code == KEY_ENTER && !ev.value)
return 0;
if (!ev.value)
continue;
// printf("code %d (%s)\n",ev.code,names[ev.code]);
if (buf_len && names[ev.code][0])
{
*(buf++) = names[ev.code][0];
*buf = 0;
buf_len--;
}
}
return -1;
}
int
main (int argc, char *argv[])
{
int fd = open_ykhid ();
struct timeval tv;
char ret[128];
squirt ("/sys/class/gpio/export", GPIO_STR);
squirt ("/sys/class/gpio/gpio" GPIO_STR "/direction", "out");
squirt ("/sys/class/gpio/gpio" GPIO_STR "/value", "0");
tv.tv_sec = 0;
tv.tv_usec = 100;
get_string_with_timeout (fd, &tv, NULL, 0);
squirt ("/sys/class/gpio/gpio" GPIO_STR "/value", "1");
tv.tv_sec = 2;
tv.tv_usec = 0;
get_string_with_timeout (fd, &tv, ret, sizeof (ret));
squirt ("/sys/class/gpio/gpio" GPIO_STR "/value", "0");
printf ("Access-Control-Allow-Origin: *\n");
printf ("Content-Type: text/plain\n\n%s\n", ret);
return 0;
}
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