blob: fabd09283def1dfda56fc4828731d25e423e0bac [file] [log] [blame]
/*
* usb_id - identify an USB device
*
* Copyright (c) 2005 SUSE Linux Products GmbH, Germany
*
* Author: Hannes Reinecke <hare@suse.de>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <stdio.h>
#include <stdlib.h>
#include <stdarg.h>
#include <unistd.h>
#include <string.h>
#include <ctype.h>
#include <fcntl.h>
#include <errno.h>
#include <getopt.h>
#include "libudev.h"
#include "libudev-private.h"
int debug;
static void log_fn(struct udev *udev, int priority,
const char *file, int line, const char *fn,
const char *format, va_list args)
{
if (debug) {
fprintf(stderr, "%s: ", fn != NULL ? fn : file);
vfprintf(stderr, format, args);
} else {
vsyslog(priority, format, args);
}
}
static char vendor_str[64];
static char vendor_str_enc[256];
static const char *vendor_id = "";
static char model_str[64];
static char model_str_enc[256];
static const char *product_id = "";
static char serial_str[UTIL_NAME_SIZE];
static char packed_if_str[UTIL_NAME_SIZE];
static char revision_str[64];
static char type_str[64];
static char instance_str[64];
static const char *ifnum;
static const char *driver;
static int use_usb_info;
static int use_num_info;
static void set_usb_iftype(char *to, int if_class_num, size_t len)
{
char *type = "generic";
switch (if_class_num) {
case 1:
type = "audio";
break;
case 2: /* CDC-Control */
break;
case 3:
type = "hid";
break;
case 5: /* Physical */
break;
case 6:
type = "media";
break;
case 7:
type = "printer";
break;
case 8:
type = "storage";
break;
case 9:
type = "hub";
break;
case 0x0a: /* CDC-Data */
break;
case 0x0b: /* Chip/Smart Card */
break;
case 0x0d: /* Content Security */
break;
case 0x0e:
type = "video";
break;
case 0xdc: /* Diagnostic Device */
break;
case 0xe0: /* Wireless Controller */
break;
case 0xfe: /* Application-specific */
break;
case 0xff: /* Vendor-specific */
break;
default:
break;
}
strncpy(to, type, len);
to[len-1] = '\0';
}
static int set_usb_mass_storage_ifsubtype(char *to, const char *from, size_t len)
{
int type_num = 0;
char *eptr;
char *type = "generic";
type_num = strtoul(from, &eptr, 0);
if (eptr != from) {
switch (type_num) {
case 2:
type = "atapi";
break;
case 3:
type = "tape";
break;
case 4: /* UFI */
case 5: /* SFF-8070i */
type = "floppy";
break;
case 1: /* RBC devices */
type = "rbc";
break;
case 6: /* Transparent SPC-2 devices */
type = "scsi";
break;
default:
break;
}
}
util_strscpy(to, len, type);
return type_num;
}
static void set_scsi_type(char *to, const char *from, size_t len)
{
int type_num;
char *eptr;
char *type = "generic";
type_num = strtoul(from, &eptr, 0);
if (eptr != from) {
switch (type_num) {
case 0:
case 0xe:
type = "disk";
break;
case 1:
type = "tape";
break;
case 4:
case 7:
case 0xf:
type = "optical";
break;
case 5:
type = "cd";
break;
default:
break;
}
}
util_strscpy(to, len, type);
}
#define USB_DT_DEVICE 0x01
#define USB_DT_INTERFACE 0x04
static int dev_if_packed_info(struct udev_device *dev, char *ifs_str, size_t len)
{
char *filename = NULL;
int fd;
ssize_t size;
unsigned char buf[18 + 65535];
unsigned int pos, strpos;
struct usb_interface_descriptor {
u_int8_t bLength;
u_int8_t bDescriptorType;
u_int8_t bInterfaceNumber;
u_int8_t bAlternateSetting;
u_int8_t bNumEndpoints;
u_int8_t bInterfaceClass;
u_int8_t bInterfaceSubClass;
u_int8_t bInterfaceProtocol;
u_int8_t iInterface;
} __attribute__((packed));
int err = 0;
if (asprintf(&filename, "%s/descriptors", udev_device_get_syspath(dev)) < 0) {
err = -1;
goto out;
}
fd = open(filename, O_RDONLY);
if (fd < 0) {
fprintf(stderr, "error opening USB device 'descriptors' file\n");
err = -1;
goto out;
}
size = read(fd, buf, sizeof(buf));
close(fd);
if (size < 18 || size == sizeof(buf)) {
err = -1;
goto out;
}
pos = 0;
strpos = 0;
while (pos < sizeof(buf) && strpos+7 < len) {
struct usb_interface_descriptor *desc;
char if_str[8];
desc = (struct usb_interface_descriptor *) &buf[pos];
if (desc->bLength < 3)
break;
pos += desc->bLength;
if (desc->bDescriptorType != USB_DT_INTERFACE)
continue;
if (snprintf(if_str, 8, "%02x%02x%02x:",
desc->bInterfaceClass,
desc->bInterfaceSubClass,
desc->bInterfaceProtocol) != 7)
continue;
if (strstr(ifs_str, if_str) != NULL)
continue;
memcpy(&ifs_str[strpos], if_str, 8),
strpos += 7;
}
out:
free(filename);
return err;
}
/*
* A unique USB identification is generated like this:
*
* 1.) Get the USB device type from InterfaceClass and InterfaceSubClass
* 2.) If the device type is 'Mass-Storage/SPC-2' or 'Mass-Storage/RBC'
* use the SCSI vendor and model as USB-Vendor and USB-model.
* 3.) Otherwise use the USB manufacturer and product as
* USB-Vendor and USB-model. Any non-printable characters
* in those strings will be skipped; a slash '/' will be converted
* into a full stop '.'.
* 4.) If that fails, too, we will use idVendor and idProduct
* as USB-Vendor and USB-model.
* 5.) The USB identification is the USB-vendor and USB-model
* string concatenated with an underscore '_'.
* 6.) If the device supplies a serial number, this number
* is concatenated with the identification with an underscore '_'.
*/
static int usb_id(struct udev_device *dev)
{
struct udev *udev = udev_device_get_udev(dev);
struct udev_device *dev_interface = NULL;
struct udev_device *dev_usb = NULL;
const char *if_class, *if_subclass;
int if_class_num;
int protocol = 0;
dbg(udev, "syspath %s\n", udev_device_get_syspath(dev));
/* shortcut, if we are called directly for a "usb_device" type */
if (udev_device_get_devtype(dev) != NULL && strcmp(udev_device_get_devtype(dev), "usb_device") == 0) {
dev_if_packed_info(dev, packed_if_str, sizeof(packed_if_str));
dev_usb = dev;
goto fallback;
}
/* usb interface directory */
dev_interface = udev_device_get_parent_with_subsystem_devtype(dev, "usb", "usb_interface");
if (dev_interface == NULL) {
info(udev, "unable to access usb_interface device of '%s'\n",
udev_device_get_syspath(dev));
return 1;
}
ifnum = udev_device_get_sysattr_value(dev_interface, "bInterfaceNumber");
driver = udev_device_get_sysattr_value(dev_interface, "driver");
if_class = udev_device_get_sysattr_value(dev_interface, "bInterfaceClass");
if (!if_class) {
info(udev, "%s: cannot get bInterfaceClass attribute\n",
udev_device_get_sysname(dev));
return 1;
}
if_class_num = strtoul(if_class, NULL, 16);
if (if_class_num == 8) {
/* mass storage */
if_subclass = udev_device_get_sysattr_value(dev_interface, "bInterfaceSubClass");
if (if_subclass != NULL)
protocol = set_usb_mass_storage_ifsubtype(type_str, if_subclass, sizeof(type_str)-1);
} else {
set_usb_iftype(type_str, if_class_num, sizeof(type_str)-1);
}
info(udev, "%s: if_class %d protocol %d\n",
udev_device_get_syspath(dev_interface), if_class_num, protocol);
/* usb device directory */
dev_usb = udev_device_get_parent_with_subsystem_devtype(dev_interface, "usb", "usb_device");
if (!dev_usb) {
info(udev, "unable to find parent 'usb' device of '%s'\n",
udev_device_get_syspath(dev));
return 1;
}
/* all interfaces of the device in a single string */
dev_if_packed_info(dev_usb, packed_if_str, sizeof(packed_if_str));
/* mass storage : SCSI or ATAPI */
if ((protocol == 6 || protocol == 2) && !use_usb_info) {
struct udev_device *dev_scsi;
const char *scsi_model, *scsi_vendor, *scsi_type, *scsi_rev;
int host, bus, target, lun;
/* get scsi device */
dev_scsi = udev_device_get_parent_with_subsystem_devtype(dev, "scsi", "scsi_device");
if (dev_scsi == NULL) {
info(udev, "unable to find parent 'scsi' device of '%s'\n",
udev_device_get_syspath(dev));
goto fallback;
}
if (sscanf(udev_device_get_sysname(dev_scsi), "%d:%d:%d:%d", &host, &bus, &target, &lun) != 4) {
info(udev, "invalid scsi device '%s'\n", udev_device_get_sysname(dev_scsi));
goto fallback;
}
/* Generic SPC-2 device */
scsi_vendor = udev_device_get_sysattr_value(dev_scsi, "vendor");
if (!scsi_vendor) {
info(udev, "%s: cannot get SCSI vendor attribute\n",
udev_device_get_sysname(dev_scsi));
goto fallback;
}
udev_util_encode_string(scsi_vendor, vendor_str_enc, sizeof(vendor_str_enc));
udev_util_replace_whitespace(scsi_vendor, vendor_str, sizeof(vendor_str)-1);
udev_util_replace_chars(vendor_str, NULL);
scsi_model = udev_device_get_sysattr_value(dev_scsi, "model");
if (!scsi_model) {
info(udev, "%s: cannot get SCSI model attribute\n",
udev_device_get_sysname(dev_scsi));
goto fallback;
}
udev_util_encode_string(scsi_model, model_str_enc, sizeof(model_str_enc));
udev_util_replace_whitespace(scsi_model, model_str, sizeof(model_str)-1);
udev_util_replace_chars(model_str, NULL);
scsi_type = udev_device_get_sysattr_value(dev_scsi, "type");
if (!scsi_type) {
info(udev, "%s: cannot get SCSI type attribute\n",
udev_device_get_sysname(dev_scsi));
goto fallback;
}
set_scsi_type(type_str, scsi_type, sizeof(type_str)-1);
scsi_rev = udev_device_get_sysattr_value(dev_scsi, "rev");
if (!scsi_rev) {
info(udev, "%s: cannot get SCSI revision attribute\n",
udev_device_get_sysname(dev_scsi));
goto fallback;
}
udev_util_replace_whitespace(scsi_rev, revision_str, sizeof(revision_str)-1);
udev_util_replace_chars(revision_str, NULL);
/*
* some broken devices have the same identifiers
* for all luns, export the target:lun number
*/
sprintf(instance_str, "%d:%d", target, lun);
}
fallback:
vendor_id = udev_device_get_sysattr_value(dev_usb, "idVendor");
product_id = udev_device_get_sysattr_value(dev_usb, "idProduct");
/* fallback to USB vendor & device */
if (vendor_str[0] == '\0') {
const char *usb_vendor = NULL;
if (!use_num_info)
usb_vendor = udev_device_get_sysattr_value(dev_usb, "manufacturer");
if (!usb_vendor)
usb_vendor = vendor_id;
if (!usb_vendor) {
info(udev, "No USB vendor information available\n");
return 1;
}
udev_util_encode_string(usb_vendor, vendor_str_enc, sizeof(vendor_str_enc));
udev_util_replace_whitespace(usb_vendor, vendor_str, sizeof(vendor_str)-1);
udev_util_replace_chars(vendor_str, NULL);
}
if (model_str[0] == '\0') {
const char *usb_model = NULL;
if (!use_num_info)
usb_model = udev_device_get_sysattr_value(dev_usb, "product");
if (!usb_model)
usb_model = product_id;
if (!usb_model) {
dbg(udev, "No USB model information available\n");
return 1;
}
udev_util_encode_string(usb_model, model_str_enc, sizeof(model_str_enc));
udev_util_replace_whitespace(usb_model, model_str, sizeof(model_str)-1);
udev_util_replace_chars(model_str, NULL);
}
if (revision_str[0] == '\0') {
const char *usb_rev;
usb_rev = udev_device_get_sysattr_value(dev_usb, "bcdDevice");
if (usb_rev) {
udev_util_replace_whitespace(usb_rev, revision_str, sizeof(revision_str)-1);
udev_util_replace_chars(revision_str, NULL);
}
}
if (serial_str[0] == '\0') {
const char *usb_serial;
usb_serial = udev_device_get_sysattr_value(dev_usb, "serial");
if (usb_serial) {
udev_util_replace_whitespace(usb_serial, serial_str, sizeof(serial_str)-1);
udev_util_replace_chars(serial_str, NULL);
}
}
return 0;
}
int main(int argc, char **argv)
{
static const struct option options[] = {
{ "usb-info", no_argument, NULL, 'u' },
{ "num-info", no_argument, NULL, 'n' },
{ "export", no_argument, NULL, 'x' },
{ "debug", no_argument, NULL, 'd' },
{ "help", no_argument, NULL, 'h' },
{}
};
struct udev *udev;
struct udev_device *dev = NULL;
static int export;
int retval = 0;
udev = udev_new();
if (udev == NULL)
goto exit;
udev_log_init("usb_id");
udev_set_log_fn(udev, log_fn);
while (1) {
int option;
option = getopt_long(argc, argv, "dnuxh", options, NULL);
if (option == -1)
break;
switch (option) {
case 'd':
debug = 1;
if (udev_get_log_priority(udev) < LOG_INFO)
udev_set_log_priority(udev, LOG_INFO);
break;
case 'n':
use_num_info = 1;
use_usb_info = 1;
break;
case 'u':
use_usb_info = 1;
break;
case 'x':
export = 1;
break;
case 'h':
printf("Usage: usb_id [--usb-info] [--num-info] [--export] [--help] [<devpath>]\n"
" --usb-info use usb strings instead\n"
" --num-info use numerical values\n"
" --export print values as environment keys\n"
" --help print this help text\n\n");
default:
retval = 1;
goto exit;
}
}
dev = udev_device_new_from_environment(udev);
if (dev == NULL) {
char syspath[UTIL_PATH_SIZE];
const char *devpath;
devpath = argv[optind];
if (devpath == NULL) {
fprintf(stderr, "missing device\n");
retval = 1;
goto exit;
}
util_strscpyl(syspath, sizeof(syspath), udev_get_sys_path(udev), devpath, NULL);
dev = udev_device_new_from_syspath(udev, syspath);
if (dev == NULL) {
err(udev, "unable to access '%s'\n", devpath);
retval = 1;
goto exit;
return 1;
}
}
retval = usb_id(dev);
if (retval == 0) {
char serial[256];
size_t l;
char *s;
s = serial;
l = util_strpcpyl(&s, sizeof(serial), vendor_str, "_", model_str, NULL);
if (serial_str[0] != '\0')
l = util_strpcpyl(&s, l, "_", serial_str, NULL);
if (instance_str[0] != '\0')
util_strpcpyl(&s, l, "-", instance_str, NULL);
if (export) {
printf("ID_VENDOR=%s\n", vendor_str);
printf("ID_VENDOR_ENC=%s\n", vendor_str_enc);
printf("ID_VENDOR_ID=%s\n", vendor_id);
printf("ID_MODEL=%s\n", model_str);
printf("ID_MODEL_ENC=%s\n", model_str_enc);
printf("ID_MODEL_ID=%s\n", product_id);
printf("ID_REVISION=%s\n", revision_str);
printf("ID_SERIAL=%s\n", serial);
if (serial_str[0] != '\0')
printf("ID_SERIAL_SHORT=%s\n", serial_str);
if (type_str[0] != '\0')
printf("ID_TYPE=%s\n", type_str);
if (instance_str[0] != '\0')
printf("ID_INSTANCE=%s\n", instance_str);
printf("ID_BUS=usb\n");
if (packed_if_str[0] != '\0')
printf("ID_USB_INTERFACES=:%s\n", packed_if_str);
if (ifnum != NULL)
printf("ID_USB_INTERFACE_NUM=%s\n", ifnum);
if (driver != NULL)
printf("ID_USB_DRIVER=%s\n", driver);
} else
printf("%s\n", serial);
}
exit:
udev_device_unref(dev);
udev_unref(udev);
udev_log_close();
return retval;
}