How to map /proc/bus/usb/devices entry to a /dev/sdX device?

Question

I need to know how I can figure out to which entry in /proc/bus/usb/devices a /dev/sdX device maps to. Basically, I need to know the vendor id and product id of a given USB stick (which may not have a serial number).

In my case, I have this entry for my flash drive in /proc/bus/usb/devices:

T:  Bus=01 Lev=01 Prnt=01 Port=00 Cnt=01 Dev#=  6 Spd=480 MxCh= 0
D:  Ver= 2.00 Cls=00(>ifc ) Sub=00 Prot=00 MxPS=64 #Cfgs=  1
P:  Vendor=0781 ProdID=5530 Rev= 2.00
S:  Manufacturer=SanDisk
S:  Product=Cruzer
S:  SerialNumber=0765400A1BD05BEE
C:* #Ifs= 1 Cfg#= 1 Atr=80 MxPwr=200mA
I:* If#= 0 Alt= 0 #EPs= 2 Cls=08(stor.) Sub=06 Prot=50 Driver=usb-storage
E:  Ad=81(I) Atr=02(Bulk) MxPS= 512 Ivl=0ms
E:  Ad=02(O) Atr=02(Bulk) MxPS= 512 Ivl=0ms

I happen to know that in my case it is /dev/sda, but I'm not sure how I can figure this out in code. My first approach was to loop through all /dev/sdXX devices and issue a SCSI_IOCTL_GET_BUS_NUMBER and/or SCSI_IOCTL_GET_IDLUN request, but the information returned doesn't help me match it up:

/tmp # ./getscsiinfo /dev/sda
SCSI bus number: 8
ID: 00
LUN: 00
Channel: 00
Host#: 08
four_in_one: 08000000
host_unique_id: 0

I'm not sure how I can use the SCSI bus number or the ID, LUN, Channel, Host to map it to the entry in /proc/bus/usb/devices. Or how I could get the SCSI bus number from the /proc/bus/usb/001/006 device, which is a usbfs device and doesn't appear to like the same ioctl's:

/tmp # ./getscsiinfo /proc/bus/usb/001/006
Could not get bus number: Inappropriate ioctl for device

Here's the test code for my little getscsiinfo test tool:

#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <fcntl.h>
#include <errno.h>
#include <scsi/scsi.h>
#include <scsi/sg.h>
#include <sys/ioctl.h>

struct scsi_idlun
{
    int four_in_one;
    int host_unique_id;
};

int main(int argc, char** argv) {
    if (argc != 2)
        return 1;

    int fd = open(argv[1], O_RDONLY | O_NONBLOCK);
    if (fd < 0)
    {
        printf("Error opening device: %m\n");
        return 1;
    }

    int busNumber = -1;
    if (ioctl(fd, SCSI_IOCTL_GET_BUS_NUMBER, &busNumber) < 0)
    {
        printf("Could not get bus number: %m\n");
        close(fd);
        return 1;
    }

    printf("SCSI bus number: %d\n", busNumber);

    struct scsi_idlun argid;
    if (ioctl(fd, SCSI_IOCTL_GET_IDLUN, &argid) < 0)
    {
        printf("Could not get id: %m\n");
        close(fd);
        return 1;
    }

    printf("ID: %02x\n", argid.four_in_one & 0xFF);
    printf("LUN: %02x\n", (argid.four_in_one >> 8) & 0xFF);
    printf("Channel: %02x\n", (argid.four_in_one >> 16) & 0xFF);
    printf("Host#: %02x\n", (argid.four_in_one >> 24) & 0xFF);
    printf("four_in_one: %08x\n", (unsigned int)argid.four_in_one);
    printf("host_unique_id: %d\n", argid.host_unique_id);

    close(fd);
    return 0;
}

Does anyone have any idea?

mzet mzet · Accepted Answer · 2012-05-18T14:14:28

I believe you can collect such information using libudev library.

Here are some details about it: http://www.signal11.us/oss/udev/

I found something like this on above site:

.. Using libudev, we'll be able to inspect the devices, including their Vendor ID (VID), Product ID (PID), serial number, and device strings, without ever opening the device. Further, libudev will tell us exactly where inside /dev the device's node is located, giving the application a robust and distribution-independent way of accessing the device. ...

How to map /proc/bus/usb/devices entry to a /dev/sdX device?

4 Answers