import socket

# binds to all interfaces, insecure
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
s.bind(('0.0.0.0', 31137)) # $ Alert[py/bind-socket-all-network-interfaces]

# binds to all interfaces, insecure
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
s.bind(('', 4040)) # $ Alert[py/bind-socket-all-network-interfaces]

# binds only to a dedicated interface, secure
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
s.bind(('84.68.10.12', 8080))

# binds to all interfaces, insecure
ALL_LOCALS = "0.0.0.0" # $ Source
s.bind((ALL_LOCALS, 9090)) # $ Alert[py/bind-socket-all-network-interfaces]

# binds to all interfaces, insecure
tup = (ALL_LOCALS, 8080)
s.bind(tup) # $ Alert[py/bind-socket-all-network-interfaces]


# IPv6
s = socket.socket(socket.AF_INET6, socket.SOCK_STREAM)
s.bind(("::", 8080)) # $ Alert[py/bind-socket-all-network-interfaces]


# FN cases from https://github.com/github/codeql/issues/21582

# Address stored in a class attribute
class Server:
    def __init__(self):
        self.bind_addr = '0.0.0.0' # $ Source
        self.port = 31137

    def start(self):
        s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
        s.bind((self.bind_addr, self.port)) # $ Alert[py/bind-socket-all-network-interfaces]

server = Server()
server.start()

# os.environ.get with insecure default
import os
host = os.environ.get('APP_HOST', '0.0.0.0') # $ Source
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
s.bind((host, 8080)) # $ Alert[py/bind-socket-all-network-interfaces]

# gevent.socket (alternative socket module)
from gevent import socket as gsocket
gs = gsocket.socket(gsocket.AF_INET, gsocket.SOCK_STREAM)
gs.bind(('0.0.0.0', 31137)) # $ Alert[py/bind-socket-all-network-interfaces]

# eventlet.green.socket (another alternative socket module)
from eventlet.green import socket as esocket
es = esocket.socket(esocket.AF_INET, esocket.SOCK_STREAM)
es.bind(('0.0.0.0', 31137)) # $ Alert[py/bind-socket-all-network-interfaces]

# AF_UNIX socket binding should not be flagged
us = socket.socket(socket.AF_UNIX, socket.SOCK_STREAM)
us.bind('')