64 lines
1.8 KiB
Python
64 lines
1.8 KiB
Python
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#!/usr/bin/env python2
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DOCUMENTATION = '''
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---
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module: hardware_facts
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short_description: "check if at least one SAT>IP server responds on the network"
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description:
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- This script sends a multicast message and awaits responses by Sat>IP servers.
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Returns the boolean variable 'satip_detected'
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'''
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EXAMPLES = '''
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- name: "detect SAT>IP Server on the network"
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action: satip_facts
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- debug:
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var: satip_detected
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'''
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import json
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import socket
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import sys
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import time
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from ansible.module_utils.basic import *
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SSDP_ADDR = "239.255.255.250"
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SSDP_PORT = 1900
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# SSDP_MX = max delay for server response
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# a value of 2s is recommended by the SAT>IP specification 1.2.2
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SSDP_MX = 2
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SSDP_ST = "urn:ses-com:device:SatIPServer:1"
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ssdpRequest = "\r\n".join((
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"M-SEARCH * HTTP/1.1",
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"HOST: %s:%d" % (SSDP_ADDR, SSDP_PORT),
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"MAN: \"ssdp:discover\"",
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"MX: %d" % (SSDP_MX),
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"ST: %s" % (SSDP_ST),
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"\r\n"))
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def main():
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module = AnsibleModule(argument_spec={}, supports_check_mode=True,)
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sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
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# according to Sat>IP Specification 1.2.2, p. 20
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# a client should send three requests within 100 ms with a ttl of 2
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sock.setsockopt(socket.IPPROTO_IP, socket.IP_MULTICAST_TTL, 2)
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sock.settimeout(SSDP_MX + 0.5)
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for _ in range(3):
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sock.sendto(ssdpRequest, (SSDP_ADDR, SSDP_PORT))
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time.sleep(0.03)
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try:
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response = sock.recv(1000)
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if response and "SERVER:" in response:
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got_response = True
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else:
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raise ValueError('No satip server detected')
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except (socket.timeout, ValueError):
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got_response = False
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module.exit_json(changed=False, ansible_facts={'satip_detected': got_response})
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if __name__ == '__main__':
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main()
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