dnsenum_scan
Perform DNS enumeration and subdomain discovery to identify potential attack surfaces during security assessments and reconnaissance activities.
Instructions
Execute dnsenum for DNS enumeration and subdomain discovery.
Args: domain: Target domain dns_server: DNS server to use wordlist: Wordlist for brute force threads: Number of threads delay: Delay between requests reverse: Enable reverse DNS lookup additional_args: Additional dnsenum arguments
Returns: DNS enumeration results
Input Schema
TableJSON Schema
| Name | Required | Description | Default |
|---|---|---|---|
| additional_args | No | ||
| delay | No | ||
| dns_server | No | ||
| domain | Yes | ||
| reverse | No | ||
| threads | No | ||
| wordlist | No |
Implementation Reference
- src/mcp_server/app.py:1194-1236 (handler)MCP server tool handler and registration for 'dnsenum_scan'. Forwards parameters to the REST API /api/dnsenum endpoint for execution.
@mcp.tool() def dnsenum_scan( domain: str, dns_server: str = "", wordlist: str = "", threads: int = 5, delay: int = 0, reverse: bool = False, additional_args: str = "", ) -> dict[str, Any]: """Execute dnsenum for DNS enumeration and subdomain discovery. Args: domain: Target domain dns_server: DNS server to use wordlist: Wordlist for brute force threads: Number of threads delay: Delay between requests reverse: Enable reverse DNS lookup additional_args: Additional dnsenum arguments Returns: DNS enumeration results """ data = { "domain": domain, "dns_server": dns_server, "wordlist": wordlist, "threads": threads, "delay": delay, "reverse": reverse, "additional_args": additional_args, } logger.info(f"🔍 Starting dnsenum DNS enumeration on {domain}") result = api_client.safe_post("api/dnsenum", data) if result.get("success"): logger.info(f"✅ dnsenum scan completed on {domain}") else: logger.error("❌ dnsenum scan failed") return result - REST API endpoint handler that implements the core logic for running dnsenum command, parsing output, and formatting results. This is the actual execution backend called by the MCP tool.
@tool(required_fields=["target"]) def execute_dnsenum(): """Execute dnsenum for DNS enumeration and subdomain discovery.""" try: data = request.get_json() if not data: return {"error": "No JSON data provided", "success": False} # Extract parameters params = extract_dnsenum_params(data) logger.info(f"Executing dnsenum on {params['domain']}") # Build command command = build_dnsenum_command(params) logger.info(f"Executing command: {' '.join(command)}") # Execute command with timing started_at = datetime.now() execution_result = execute_command( " ".join(command), timeout=600 ) # 10 minute timeout for DNS enumeration ended_at = datetime.now() return parse_dnsenum_output( execution_result, params, " ".join(command), started_at, ended_at ) except ValueError as e: logger.error(f"Invalid parameters for dnsenum: {e}") return { "error": f"Invalid parameters: {str(e)}", "success": False, "tool": "dnsenum", } except Exception as e: logger.error(f"Unexpected error in dnsenum execution: {e}") return { "error": f"Execution failed: {str(e)}", "success": False, "tool": "dnsenum", } - Helper function to construct the dnsenum command line arguments from input parameters.
def build_dnsenum_command(params): """Build dnsenum command from parameters.""" cmd_parts = ["dnsenum", "--nocolor", "-v", "-t", "60"] # Add domain cmd_parts.append(params["domain"]) # Add DNS server if specified if params["dns_server"]: cmd_parts.extend(["--dnsserver", params["dns_server"]]) # Add wordlist file if specified if params["wordlist"]: cmd_parts.extend(["-f", params["wordlist"]]) # Add threads if specified if params["threads"] != 5: cmd_parts.extend(["--threads", str(params["threads"])]) # Add delay if specified if params["delay"] > 0: cmd_parts.extend(["-d", str(params["delay"])]) # Add reverse lookup option if not params["reverse"]: cmd_parts.append("--noreverse") # Handle additional arguments if params["additional_args"]: try: additional_parts = shlex.split(params["additional_args"]) cmd_parts.extend(additional_parts) except ValueError as e: logger.warning(f"Failed to parse additional_args: {e}") - Helper function to parse dnsenum output and extract subdomain findings with deduplication.
def parse_dnsenum_subdomains(stdout, domain): """Extract subdomains from dnsenum output.""" findings = [] seen_subdomains = set() if not stdout.strip(): return findings lines = stdout.strip().split("\n") for line in lines: line = line.strip() # Skip empty lines and noise if not line: continue # Look for successful DNS resolutions (lines with IP addresses) if "IN A" in line and "query failed" not in line.lower(): parts = line.split() if len(parts) >= 5: subdomain_candidate = parts[0].rstrip(".") ip_address = parts[-1] # Check if this is a subdomain of our target domain if ( subdomain_candidate.endswith(f".{domain}") or subdomain_candidate == domain ): if subdomain_candidate not in seen_subdomains: seen_subdomains.add(subdomain_candidate) finding = { "type": "subdomain", "target": subdomain_candidate, "evidence": { "subdomain": subdomain_candidate, "domain": domain, "ip_address": ip_address, "discovered_by": "dnsenum", }, "tags": ["subdomain", "dns_enumeration"], "raw_ref": line, } findings.append(finding) return findings - Parameter extraction and validation function defining the input schema for the dnsenum tool.
def extract_dnsenum_params(data): """Extract dnsenum parameters from request data.""" return { "domain": data.get("target", "").strip(), "dns_server": data.get("dns_server", "").strip(), "wordlist": data.get("wordlist", "").strip(), "threads": data.get("threads", 5), "delay": data.get("delay", 0), "reverse": data.get("reverse", False), "additional_args": data.get("additional_args", "").strip(), }