add --filter-services as optional command-line flag

Author: naiyoma

check-dnsseeds.py

@@ -3,6 +3,7 @@
 Simple script to check the status of all Bitcoin Core DNS seeds.
 Seeds are available from https://github.com/bitcoin/bitcoin/blob/master/src/kernel/chainparams.cpp
 '''
+import argparse
 import subprocess
 from itertools import combinations
 
@@ -69,7 +70,7 @@ def get_combinations(services):
 
 def check_dns_support(combination_hex, provider):
     """
-    Checks if a DNS provider supports a given combination of flags.
+    Checks if a DNS provider supports a given combination of service flags.
     """
 
     domain = f"x{combination_hex}.{provider}"
@@ -82,6 +83,11 @@ def check_dns_support(combination_hex, provider):
         return False  
 
 if __name__ == "__main__":
+    parser = argparse.ArgumentParser(description='Bitcoin Core Filter DNS Seeds')
+    parser.add_argument('--filter-services', action='store_true', help='Scan which filters are in use')
+    args = parser.parse_args()
+
+
     print("\nBitcoin Core DNS Seed Status Check:\n")
 
     for (network, seeds) in SEEDS_PER_NETWORK.items():
@@ -93,23 +99,24 @@ def check_dns_support(combination_hex, provider):
         print()
 
     print("\n")
-    combinations = get_combinations({
-        "NODE_NONE": NODE_NONE,
-        "NODE_NETWORK": NODE_NETWORK,
-        "NODE_BLOOM": NODE_BLOOM,
-        "NODE_WITNESS": NODE_WITNESS,
-        "NODE_COMPACT_FILTERS": NODE_COMPACT_FILTERS,
-        "NODE_NETWORK_LIMITED": NODE_NETWORK_LIMITED,
-        "NODE_P2P_V2": NODE_P2P_V2,
-    })
-
-    print("All possible combinations of node services and their bit flags in hexadecimal:")
-    for combination_hex, service_names in combinations:
-        print(f"  Bit flag (hex): {combination_hex} - Service: {', '.join(service_names)}")
-
-        for (network, seeds) in SEEDS_PER_NETWORK.items():
-            for hostname in seeds:
-                supports_combination = check_dns_support(combination_hex, hostname)
-                print(f" Network: {network}, Provider: {hostname} - Supports Service: {supports_combination}")
-
-   
+
+    if args.filter_services:
+        combinations = get_combinations({
+            "NODE_NONE": NODE_NONE,
+            "NODE_NETWORK": NODE_NETWORK,
+            "NODE_BLOOM": NODE_BLOOM,
+            "NODE_WITNESS": NODE_WITNESS,
+            "NODE_COMPACT_FILTERS": NODE_COMPACT_FILTERS,
+            "NODE_NETWORK_LIMITED": NODE_NETWORK_LIMITED,
+            "NODE_P2P_V2": NODE_P2P_V2,
+        })
+
+        print("All possible combinations of node services and their bit flags in hexadecimal:")
+        for combination_hex, service_names in combinations:
+            print(f"  Bit flag (hex): {combination_hex} - Service: {', '.join(service_names)}")
+
+            for (network, seeds) in SEEDS_PER_NETWORK.items():
+                for hostname in seeds:
+                    supports_combination = check_dns_support(combination_hex, hostname)
+                    print(f" Network: {network}, Provider: {hostname} - Supports Service: {supports_combination}")
+