SDS100/SDS200: sds200, ftp, directory listing & names

[n1moy]

Greetings!

Have been scrutinizing the directory listing from the sds200 ftp server.

227 Entering Passive Mode (192,168,24,40,4,27)
150 Opening data connection.
d--------- 1 owner nogroup 0 Jan 12 20:14 .
d--------- 1 owner nogroup 0 Jan 12 20:14 ..
d--------- 1 owner nogroup 0 Jan 25 12:22 583962D7
d--------- 1 owner nogroup 0 Jan 25 14:42 58397550
d--------- 1 owner nogroup 0 Jan 25 15:46 58397DCE
d--------- 1 owner nogroup 0 Jan 25 16:43 58398564
d--------- 1 owner nogroup 0 Jan 25 17:54 58398ED6
d--------- 1 owner nogroup 0 Jan 25 19:34 58399C5A
d--------- 1 owner nogroup 0 Jan 25 20:49 5839A623
d--------- 1 owner nogroup 0 Jan 25 22:06 5839B0D1
d--------- 1 owner nogroup 0 Jan 26 00:23 583A02F3
d--------- 1 owner nogroup 0 Jan 26 02:52 583A1699
226 Transfer complete.

The hexadecimal directory names are perhaps a timestamp ?

Looking for methods to generate or read the name. Seeking any related documentation.

Thanks in advance,

 

[belvdr]

Looks like epoch time converted to hex.

 

[n1moy]

Unix Hex Timestamp Converter

www.epochconverter.com

"converts your hex timestamp/epoch to a normal date"

583A1699 = Saturday, November 26, 2016 6:11:21 PM GMT-05:00

d--------- 1 owner nogroup 0 Jan 26 02:52 583A1699

Does not appear to corrdespond

 

[JoeBearcat]

Looks like it corresponds pretty well short a 9 minute time difference. (assuming you are in the Eastern time zone)

 

[ProScan]

FileZilla shows like this

 

[belvdr]

Looks like it corresponds pretty well short a 9 minute time difference. (assuming you are in the Eastern time zone)

I'm not sure I follow.

 

[n1moy]

? November 26, 2016 & January 26, 2024 ?

It appears that the directory timestamp names are related to hexadecimal epoch time.

 

[n1moy]

Composed a Bash script on my Linux machine for the directory analysis.

uniden-directory.sh

Displays sorted directories in /audio/user_rec

#!/bin/bash

# uniden-directory.sh
# Bash script to read sds200/microSD directories. - n1moy

RADIO="192.168.24.40"    # IP address
READ="read.user"         # read only user
RPASSWD="password"       # password-read

SESSION=`ftp -inv <<ROUT
open $RADIO
user $READ $RPASSWD
cd /audio/user_rec
ls
bye
ROUT`

gawk '{if ($1 ~ /^d-{9}/ && ($9 !~ /\.{1,2}/)) \
print $6, $7, $8, $9}' <<< "$SESSION" | sort -dk9
exit

 

[n1moy]

Laughable error ... posted the wrong version!
Here is the correct one.

#!/bin/bash

# uniden-directory.sh
# Bash script to read sds200/microSD directories. - n1moy

RADIO="192.168.24.40"    # IP address
READ="read.user"         # read only user
RPASSWD="password"       # password-read

SESSION=`ftp -inv <<ROUT
open $RADIO
user $READ $RPASSWD
cd /audio/user_rec
ls
bye
ROUT`

DIR_LIST=$(echo "$SESSION" | sort -dk9)

gawk '{if ($1 ~ /^d-{9}/ && ($9 !~ /\.{1,2}/)) \
print $6, $7, $8, $9 }'  <<< "$DIR_LIST"
exit

 

[belvdr]

Great work! I have a couple of suggestions.

Make the environment variables read from command-line parameters, make the variable names friendlier/more descriptive, and create a usage function. Something like this:

if [ "$#" -ne "3" ]; then
   echo "Usage:"
   echo "   uniden_directory.sh <IP> <FTP read username> <FTP read password>"
   exit 1
else
   IP="$1"
   USERNAME="$2"
   PASSWORD="$3"
fi

This checks for exactly 3 parameters given. If there aren't, it outputs how to use the program and exits. Otherwise, it assigns those parameters into the variables. Then you'd run it with:

./uniden-directory.sh 192.168.24.40 read.user password

The next suggestion (and I need to do this on my own projects too) is to use Python. It not only has the capability, but also the portability to run on a wide number of platforms, including Windows and macOS. As it stands today, this script only works on platforms with the GNU utilities available. I'll see if I can get something going, although it may be a bit, as my SDS is not on the LAN at the moment.

 

[belvdr]

Here's a Python script, tested with 3.11.6. In this code, the usage will always output whatever the script is named.

import ftplib
import sys

SCRIPT_NAME = sys.argv[0]

# We require 3 command line parameters.  Since argv[0] is one of those, we test for 4
if len(sys.argv) != 4:
    # Echo usage and exit with status 1
    print(SCRIPT_NAME, "<IP> <FTP Read Username> <FTP Read Password>")
    sys.exit(1)

# Grab the data from the command line
FTP_HOST = sys.argv[1]
FTP_USER = sys.argv[2]
FTP_PASS = sys.argv[3]

# Initialize an array for the directory listing
DIR_LIST = []

# Start FTP session
ftp = ftplib.FTP(FTP_HOST, FTP_USER, FTP_PASS)

# Force UTF-8 encoding
ftp.encoding = "utf-8"

# List the recording directory into a variable
ftp.dir("/audio/user_rec/", DIR_LIST.append)

# We have our data, so let's clost the FTP connection
ftp.quit()

# Loop through the directory listing
for LINE in DIR_LIST:
    # If the line starts with "d", then it's a directory
    if LINE.startswith("d"):
        # Split the line by spaces and grab the last item on the line, the directory name
        DIR_NAME = LINE.split()[-1]
        try:
            # Try to convert the directory name to an integer, using Base-16.  If successful, then it's a valid hexadecimal number, so print it.
            if int(DIR_NAME, 16):
                print(DIR_NAME)
        except:
            # Ignore any exceptions, as they are not valid hexadecimal numbers.
            pass

 

[n1moy]

Thanks for your comments and suggestions!

As a start, had already ordered a couple of Python books. May use this endeavor as part of that study. Are sending User Datagram Protocol commands problematic with Python ?

Plug the scanner into your LAN!

 

[belvdr]

Thanks for your comments and suggestions!

As a start, had already ordered a couple of Python books. May use this endeavor as part of that study. Are sending User Datagram Protocol commands problematic with Python ?

Plug the scanner into your LAN!

I have not tried sending commands in Python similar to netcat. I did get my SDS connected and the script was tested against it.

 

[belvdr]

Thanks for your comments and suggestions!

As a start, had already ordered a couple of Python books. May use this endeavor as part of that study. Are sending User Datagram Protocol commands problematic with Python ?

Plug the scanner into your LAN!

See your other thread. I posted a Python3 script for sending commands via TCP or UDP.