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Re: ioctl SIOCGARP failed! errno: 6

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On Fri, 2018-06-08, Ohm Trivedi wrote:
> I am a graduate student and I am trying to use this tool,
> Hershelplus
> (https://github.com/zk7/hershelplus/tree/master/multi-platform), for
> OS fingerprinting.
>
> The tool attempts to send an ARP request to destination MAC, but it
> fails. The output is as follows:
>
> ohmtrivedi@ohm-HP-ENVY:~/Documents/ms-thesis/hershelplus$ sudo \
> ./hershelplus 420OS_db.txt 420OS_mapping.txt 186.32.55.31 80
>
> Reading from 420OS_db.txt...
> Stored 21000 signatures in map
> Starting Live fingerprinting of 186.32.55.31:80...
> Listing system adapters:
>
> 1. enx00e151b0014d at 10.15.15.111
>
> 2. lo at 127.0.0.1
>
> Enter the adapter number between 1 and 2: 1

That's a weird user interface -- first accepting command-line options,
and then suddenly start prompting for more information.  Did you try
the more mainstream 'nmap' utility for OS fingerprinting.

> -----------------------------------------------
> Opening device enx00e151b0014d
> Adapter enx00e151b0014d opened successfully
> Local MAC Address Is: 00--31-81--80-01-77
> Local IP: 10.15.15.111
> ioctl SIOCGARP failed! errno: 6
> Creation of Send Packet failed
> Error getting fingerprint
>
> The error "ioctl SIOCGARP failed! errno: 6" is coming from file
> LiveFingerprinter.cpp, line# 600.
> (https://github.com/zk7/hershelplus/blob/master/multi-platform/LiveFingerprinter.cpp)
>
> I can't find any resources on internet which can tell me what this
> error is about. Hope someone can help me out here. I am not very
> experienced in Linux/C++.

This is the reason most software never prints the errno number, but
the corresponding text.  After digging around on my system I found it
in /usr/include/asm-generic/errno-base.h:

#define ENXIO  6  /* No such device or address */

What this means in this context, I don't know ... additional clues can
be found
- by reading the arp(7) man page
- by running the tool inside strace to see (perhaps) that it's passing
  garbage to the ioctl() function

I note that "enx00e151b0014d" seems to be at the limit for how long an
interface name (if you can call that a name) can be:

           struct arpreq {
               struct sockaddr arp_pa;      /* protocol address */
               struct sockaddr arp_ha;      /* hardware address */
               int             arp_flags;   /* flags */
               struct sockaddr arp_netmask; /* netmask of protocol address */
               char            arp_dev[16];
           };

/Jorgen

-- 
  // Jorgen Grahn <grahn@  Oo  o.   .     .
\X/     snipabacken.se>   O  o   .

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Thread

ioctl SIOCGARP failed! errno: 6 Ohm Trivedi <ohmtrivedi@gmail.com> - 2018-06-08 10:24 -0700
  Re: ioctl SIOCGARP failed! errno: 6 Rainer Weikusat <rweikusat@talktalk.net> - 2018-06-08 20:32 +0100
  Re: ioctl SIOCGARP failed! errno: 6 Jorgen Grahn <grahn+nntp@snipabacken.se> - 2018-06-08 19:42 +0000
    Re: ioctl SIOCGARP failed! errno: 6 Ohm Trivedi <ohmtrivedi@gmail.com> - 2018-06-08 13:48 -0700
      Re: ioctl SIOCGARP failed! errno: 6 Jorgen Grahn <grahn+nntp@snipabacken.se> - 2018-06-09 07:24 +0000
        Re: ioctl SIOCGARP failed! errno: 6 Ohm Trivedi <ohmtrivedi@gmail.com> - 2018-06-09 18:53 -0700
          Re: ioctl SIOCGARP failed! errno: 6 Jorgen Grahn <grahn+nntp@snipabacken.se> - 2018-06-10 06:05 +0000
          Re: ioctl SIOCGARP failed! errno: 6 Rainer Weikusat <rweikusat@talktalk.net> - 2018-06-10 17:54 +0100
  Re: ioctl SIOCGARP failed! errno: 6 Ohm Trivedi <ohmtrivedi@gmail.com> - 2018-06-08 13:45 -0700
    Re: ioctl SIOCGARP failed! errno: 6 Rainer Weikusat <rweikusat@talktalk.net> - 2018-06-08 22:24 +0100

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