2e2378d3ee
All pure stdlib, zero external dependencies: - dns: raw UDP resolver with A/AAAA/MX/NS/TXT/CNAME/PTR/SOA - encode: base64, hex, URL, ROT13 encode/decode - hash: md5/sha1/sha256/sha512 generation + type identification - defang: IOC defanging/refanging for safe sharing - revshell: reverse shell one-liners for 11 languages - cidr: subnet calculator with IP membership check Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
79 lines
2.3 KiB
Python
79 lines
2.3 KiB
Python
"""Plugin: CIDR/subnet calculator."""
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from __future__ import annotations
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import ipaddress
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from derp.plugin import command
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@command("cidr", help="Subnet info: !cidr <network> | !cidr contains <net> <ip>")
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async def cmd_cidr(bot, message):
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"""Calculate subnet properties or check IP membership.
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!cidr 192.168.1.0/24
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!cidr contains 10.0.0.0/8 10.1.2.3
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"""
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parts = message.text.split()
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if len(parts) < 2:
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await bot.reply(message, "Usage: !cidr <network> | !cidr contains <net> <ip>")
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return
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subcmd = parts[1].lower()
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if subcmd == "contains" and len(parts) >= 4:
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await _contains(bot, message, parts[2], parts[3])
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elif subcmd == "contains":
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await bot.reply(message, "Usage: !cidr contains <network> <ip>")
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else:
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await _info(bot, message, parts[1])
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async def _info(bot, message, network_str: str) -> None:
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"""Show subnet information."""
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try:
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net = ipaddress.ip_network(network_str, strict=False)
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except ValueError:
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await bot.reply(message, f"Invalid network: {network_str}")
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return
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if isinstance(net, ipaddress.IPv4Network):
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host_count = net.num_addresses - 2 if net.prefixlen < 31 else net.num_addresses
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parts = [
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f"net:{net.network_address}/{net.prefixlen}",
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f"range:{net[0]}-{net[-1]}",
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f"hosts:{host_count}",
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f"mask:{net.netmask}",
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f"wildcard:{net.hostmask}",
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]
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if net.prefixlen < 31:
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parts.append(f"broadcast:{net.broadcast_address}")
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else:
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parts = [
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f"net:{net.network_address}/{net.prefixlen}",
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f"range:{net[0]}-{net[-1]}",
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f"hosts:{net.num_addresses}",
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]
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await bot.reply(message, " | ".join(parts))
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async def _contains(bot, message, network_str: str, ip_str: str) -> None:
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"""Check if an IP belongs to a network."""
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try:
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net = ipaddress.ip_network(network_str, strict=False)
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except ValueError:
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await bot.reply(message, f"Invalid network: {network_str}")
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return
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try:
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addr = ipaddress.ip_address(ip_str)
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except ValueError:
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await bot.reply(message, f"Invalid IP: {ip_str}")
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return
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if addr in net:
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await bot.reply(message, f"{addr} is in {net}")
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else:
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await bot.reply(message, f"{addr} is NOT in {net}")
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