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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Misc USB routines
*
* Copyright (C) 2003 Aurelien Jarno (aurelien@aurel32.net)
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <limits.h>
#ifdef HAVE_ICONV
#include <iconv.h>
#endif
#ifdef HAVE_NL_LANGINFO
#include <langinfo.h>
#endif
#include "usbmisc.h"
/* ---------------------------------------------------------------------- */
static const char *devbususb = "/dev/bus/usb";
/* ---------------------------------------------------------------------- */
static int readlink_recursive(const char *path, char *buf, size_t bufsize)
{
char temp[PATH_MAX + 1];
char *ptemp;
int ret;
ret = readlink(path, buf, bufsize-1);
if (ret > 0) {
buf[ret] = 0;
if (*buf != '/') {
strncpy(temp, path, sizeof(temp) - 1);
ptemp = temp + strlen(temp);
while (*ptemp != '/' && ptemp != temp)
ptemp--;
ptemp++;
strncpy(ptemp, buf, bufsize + temp - ptemp - 1);
} else
strncpy(temp, buf, sizeof(temp) - 1);
return readlink_recursive(temp, buf, bufsize);
} else {
strncpy(buf, path, bufsize);
return strlen(buf);
}
}
static char *get_absolute_path(const char *path, char *result,
size_t result_size)
{
const char *ppath; /* pointer on the input string */
char *presult; /* pointer on the output string */
ppath = path;
presult = result;
result[0] = 0;
if (path == NULL)
return result;
if (*ppath != '/') {
result = getcwd(result, result_size);
presult += strlen(result);
result_size -= strlen(result);
*presult++ = '/';
result_size--;
}
while (*ppath != 0 && result_size > 1) {
if (*ppath == '/') {
do
ppath++;
while (*ppath == '/');
*presult++ = '/';
result_size--;
} else if (*ppath == '.' && *(ppath + 1) == '.' &&
*(ppath + 2) == '/' && *(presult - 1) == '/') {
if ((presult - 1) != result) {
/* go one directory upper */
do {
presult--;
result_size++;
} while (*(presult - 1) != '/');
}
ppath += 3;
} else if (*ppath == '.' &&
*(ppath + 1) == '/' &&
*(presult - 1) == '/') {
ppath += 2;
} else {
*presult++ = *ppath++;
result_size--;
}
}
/* Don't forget to mark the end of the string! */
*presult = 0;
return result;
}
libusb_device *get_usb_device(libusb_context *ctx, const char *path)
{
libusb_device **list;
libusb_device *dev;
ssize_t num_devs, i;
char device_path[PATH_MAX + 1];
char absolute_path[PATH_MAX + 1];
readlink_recursive(path, device_path, sizeof(device_path));
get_absolute_path(device_path, absolute_path, sizeof(absolute_path));
dev = NULL;
num_devs = libusb_get_device_list(ctx, &list);
for (i = 0; i < num_devs; ++i) {
uint8_t bnum = libusb_get_bus_number(list[i]);
uint8_t dnum = libusb_get_device_address(list[i]);
snprintf(device_path, sizeof(device_path), "%s/%03u/%03u",
devbususb, bnum, dnum);
if (!strcmp(device_path, absolute_path)) {
dev = list[i];
break;
}
}
libusb_free_device_list(list, 0);
return dev;
}
static char *get_dev_string_ascii(libusb_device_handle *dev, size_t size,
uint8_t id)
{
char *buf = malloc(size);
int ret = libusb_get_string_descriptor_ascii(dev, id,
(unsigned char *) buf,
size);
if (ret < 0) {
free(buf);
return strdup("(error)");
}
return buf;
}
#if defined(HAVE_NL_LANGINFO) && defined(HAVE_ICONV)
static uint16_t get_any_langid(libusb_device_handle *dev)
{
unsigned char buf[4];
int ret = libusb_get_string_descriptor(dev, 0, 0, buf, sizeof buf);
if (ret != sizeof buf) return 0;
return buf[2] | (buf[3] << 8);
}
static char *usb_string_to_native(char * str, size_t len)
{
size_t num_converted;
iconv_t conv;
char *result, *result_end;
size_t in_bytes_left, out_bytes_left;
conv = iconv_open(nl_langinfo(CODESET), "UTF-16LE");
if (conv == (iconv_t) -1)
return NULL;
in_bytes_left = len * 2;
out_bytes_left = len * MB_CUR_MAX;
result = result_end = malloc(out_bytes_left + 1);
num_converted = iconv(conv, &str, &in_bytes_left,
&result_end, &out_bytes_left);
iconv_close(conv);
if (num_converted == (size_t) -1) {
free(result);
return NULL;
}
*result_end = 0;
return result;
}
#endif
char *get_dev_string(libusb_device_handle *dev, uint8_t id)
{
#if defined(HAVE_NL_LANGINFO) && defined(HAVE_ICONV)
int ret;
char *buf, unicode_buf[254];
uint16_t langid;
#endif
if (!dev || !id) return strdup("");
#if defined(HAVE_NL_LANGINFO) && defined(HAVE_ICONV)
langid = get_any_langid(dev);
if (!langid) return strdup("(error)");
/*
* Some devices lie about their string size, so initialize
* the buffer with all 0 to account for that.
*/
memset(unicode_buf, 0x00, sizeof(unicode_buf));
ret = libusb_get_string_descriptor(dev, id, langid,
(unsigned char *) unicode_buf,
sizeof unicode_buf);
if (ret < 2) return strdup("(error)");
if ((unsigned char)unicode_buf[0] < 2 || unicode_buf[1] != LIBUSB_DT_STRING)
return strdup("(error)");
buf = usb_string_to_native(unicode_buf + 2,
((unsigned char) unicode_buf[0] - 2) / 2);
if (!buf) return get_dev_string_ascii(dev, 127, id);
return buf;
#else
return get_dev_string_ascii(dev, 127, id);
#endif
}
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