From 20b63626e2cfce44d6c0b0c869270af2418838e9 Mon Sep 17 00:00:00 2001
From: Krishna13515 <krishnakhadka13515@gmail.com>
Date: Mon, 17 Oct 2022 11:30:06 +0545
Subject: [PATCH] added DNS verifier script

---
 Misc/DNS Verifier/DNS_Verifier.py  | 58 ++++++++++++++++++++++++++++++
 Misc/DNS Verifier/README.md        | 26 ++++++++++++++
 Misc/DNS Verifier/requirements.txt |  1 +
 3 files changed, 85 insertions(+)
 create mode 100644 Misc/DNS Verifier/DNS_Verifier.py
 create mode 100644 Misc/DNS Verifier/README.md
 create mode 100644 Misc/DNS Verifier/requirements.txt

diff --git a/Misc/DNS Verifier/DNS_Verifier.py b/Misc/DNS Verifier/DNS_Verifier.py
new file mode 100644
index 0000000..bfff4c6
--- /dev/null
+++ b/Misc/DNS Verifier/DNS_Verifier.py	
@@ -0,0 +1,58 @@
+#!/usr/bin/python3
+# code: utf-8
+import json
+import sys
+from collections import OrderedDict
+
+import dns.resolver
+
+
+def dac(dns_val=None) -> OrderedDict:
+    """
+    Domain Availability Checker (DNS lookup)
+
+    :param _dns: URL string
+    :return: Availability [True, False]
+    """
+    ip_values = None
+    avail = False
+
+    if dns_val is None:
+        raise ValueError("Sorry, DNS is needed")
+    if isinstance(dns_val, str) is False:
+        raise TypeError("Sorry, \'DNS\' must be type \'str\'")
+    try:
+        output = dns.resolver.resolve(dns_val, 'A')
+        ip_values = [ipval.to_text() for ipval in output]
+    except dns.resolver.NXDOMAIN:
+        avail = True
+
+    return OrderedDict([
+        ("DNS", dns_val),
+        ("IP", ip_values),
+        ("AVAIL", avail),
+    ])
+
+
+if __name__ == '__main__':
+    dns_val = None
+    option = None
+
+    if len(sys.argv) > 1:
+        if '--dns' in sys.argv:
+            d_index = sys.argv.index('--dns')
+            if d_index == sys.argv.index(sys.argv[-1:][0]):
+                print("Sorry, DNS was not specified")
+                sys.exit(1)
+            dns_val = sys.argv[sys.argv.index('--dns') + 1]
+        else:
+            print("help:\nuse \'--dns\' for DNS specification")
+            sys.exit(1)
+    try:
+        response = dac(dns_val=dns_val)
+    except Exception as err:
+        print(f"error: {err}")
+        sys.exit(1)
+
+    print(json.dumps(response, indent=4))
+    sys.exit(0)
diff --git a/Misc/DNS Verifier/README.md b/Misc/DNS Verifier/README.md
new file mode 100644
index 0000000..5e5c324
--- /dev/null
+++ b/Misc/DNS Verifier/README.md	
@@ -0,0 +1,26 @@
+## DNSLU - DNS LOOK UP
+
+## Setup and activate virtual environment :
+For Unix based systems please execute the following command to create venv and install requirements.
+```
+make init
+source .venv/bin/activate
+```
+
+Domain availability checker (DNS lookup) #138
+
+Usage: 
+
+    python dnslu.py --dns <DNS>
+
+
+output:
+
+    python dnslu.py --dns google.com
+    {
+        "DNS": "google.com",
+        "IP": [
+            "172.217.172.78"
+        ],
+        "AVAIL": false
+    }
\ No newline at end of file
diff --git a/Misc/DNS Verifier/requirements.txt b/Misc/DNS Verifier/requirements.txt
new file mode 100644
index 0000000..c186c6c
--- /dev/null
+++ b/Misc/DNS Verifier/requirements.txt	
@@ -0,0 +1 @@
+dnspython==2.0.0