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sip_callerid.py
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#!/usr/bin/env python
import argparse, sys, os, re, string, random, hashlib, socket, atexit, time
import requests
import logging, logging.handlers
from twisted.internet import reactor
from twisted.internet.protocol import DatagramProtocol
from twisted.names import client
from twisted.internet.task import LoopingCall
from signal import SIGTERM
import logging
import logging.handlers
app_name="sip_callerid"
app_version="1.0"
def main():
parser = argparse.ArgumentParser(prog=app_name, description="Magnus 2014-08-18")
parser.add_argument('--server', action='store', required=True, help='SIP server to connect to')
parser.add_argument('--port', action='store', type=int, required=False, default=5060, help='SIP server port to use')
parser.add_argument('--number', action='store', required=True, help='Number to authenticate with')
parser.add_argument('--authname', action='store', required=True, help='Name to authenticate with')
parser.add_argument('--password', action='store', required=True, help='Password to use')
parser.add_argument('--realm', action='store', required=False, help='Realm')
parser.add_argument('--url', action='store', required=False, help='URL to call on incoming call. CALLERID will be replace with callerid.')
parser.add_argument('--pid-file', action='store', required=False, default="/tmp/callerid.pid", help='PID file')
parser.add_argument('-V', '--version', action='version', version="%(prog)s version "+app_version)
args = parser.parse_args()
hostname, alias, ips = socket.gethostbyaddr(args.server)
args.server = ips.pop()
logger = logging.getLogger(app_name)
logger.setLevel(logging.INFO)
handler = logging.handlers.SysLogHandler(address = '/dev/log')
logger.addHandler(handler)
sip = SipClient(logger, args.server, args.port, args.number, args.authname, args.password, args.realm, args.url)
reactor.listenUDP(0, sip)
def register_task():
logger.info("Sending registration...")
sip.sendsip(sip.msg_register)
register_timer = LoopingCall(register_task)
register_timer.start(180)
print "Connecting to SIP server. See syslog for more information."
class SipCallerDaemon(Daemon):
def run(self, logger):
logger.info('Starting')
while True:
reactor.run()
daemon = SipCallerDaemon(args.pid_file)
if not daemon.start(logger):
print "Already running, restarting..."
daemon.restart(logger)
sys.exit(0)
class SipClient(DatagramProtocol):
msg_register = """REGISTER sip:$server SIP/2.0
CSeq: $seq REGISTER
Via: SIP/2.0/UDP $myip:$port; branch=$branch;rport
User-Agent: """+app_name+""" / """+app_version+"""
From: <sip:$number@$server>;tag=$tag
Call-ID: $callid
To: <sip:$number@$server>
Contact: <sip:$number@$myip>;q=1
Allow: INVITE,ACK,OPTIONS,BYE,CANCEL,SUBSCRIBE,NOTIFY,REFER,MESSAGE,INFO,PING
Expires: 3600
Content-Length: 0
Max-Forwards: 70
"""
msg_register_auth = """REGISTER sip:$server SIP/2.0
CSeq: $seq REGISTER
Via: SIP/2.0/UDP $myip:$port; branch=$branch;rport
User-Agent: """+app_name+""" / """+app_version+"""
Authorization: Digest username="$authname", realm="$realm", nonce="$nonce", uri="sip:$server", algorithm=MD5, response="$response"
From: <sip:$number@$server>;tag=$tag
Call-ID: $callid
To: <sip:$number@$server>
Contact: <sip:$number@$myip>;q=1
Expires: 3600
Content-Length: 0
Max-Forwards: 70
"""
msg_options = """SIP/2.0 200 OK
Via: SIP/2.0/UDP $server:$port;branch=$branch;rport
From: "$realm" <sip:$realm@$server>;tag=$remote_tag
To: <sip:$number@$myip:5060>;tag=$tag
Call-ID: $callid
CSeq: $seq OPTIONS
Supported: replaces
User-Agent: """+app_name+""" / """+app_version+"""
Allow: INVITE, ACK, CANCEL, BYE, OPTIONS, INFO, REFER, SUBSCRIBE, NOTIFY
Content-Length: 0
"""
def __init__(self, logger, server, port, number, authname, password, realm=None, url=None):
self.logger = logger
self.realm = realm
self.url = url
self.server = server
self.port = port
self.number = number
self.authname = authname
self.password = password
self.tag = ''.join([random.choice(string.digits) for i in range(10)])
self.seq = 1
self.response = ""
self.nonce = ""
self.callerid_branch = ""
self.myip="0.0.0.0"
self.registration_counter = 0
def datagramReceived(self, data, (host, port)):
if host != self.server:
return
lines = data.split("\n")
self.logger.debug(lines[0])
if lines[0][0:7] == "SIP/2.0":
status = lines[0][8:11]
if status == "401":
if self.registration_counter > 5:
self.logger.error("Could not register. Exit.")
sys.exit(1)
self.registration_counter += 1
m = re.search(".*nonce=\"(\w+)\".*", data)
if m: self.nonce = m.groups()[0]
if not self.realm:
m = re.search(".*realm=\"([\w\d\.]+)\".*", data)
if m: self.realm = m.groups()[0]
ha1 = hashlib.md5(b""+self.authname+":"+self.realm+":"+self.password).hexdigest()
ha2 = hashlib.md5(b"REGISTER:sip:"+self.server).hexdigest()
self.response = hashlib.md5(b""+ha1+":"+self.nonce+":"+ha2).hexdigest()
self.seq = self.seq + 1
self.sendsip(self.msg_register_auth)
if lines[0][0:7] == "OPTIONS":
self.registration_counter = 0
m = re.search(".*tag=(\w+).*", data)
if m: remote_tag = m.groups()[0]
m = re.search(".*branch=(\w+).*", data)
if m: branch = m.groups()[0]
m = re.search(".*Call-ID: ([\w@\.\:]+).*", data)
if m: callid = m.groups()[0]
m = re.search(".*CSeq: ([\d]+).*", data)
if m: self.seq = int(m.groups()[0])
#m = re.search(".*CSeq: ([\d]+).*", data)
self.sendsip(self.msg_options, branch=branch, callid=callid, remote_tag=remote_tag)
if lines[0][0:6] == "INVITE":
callerid = "unknown"
m = re.search('.*From: \"(\w+)\".*', data)
if m: callerid = m.groups()[0]
m = re.search(".*branch=(\w+).*", data)
if m:
if self.callerid_branch and self.callerid_branch == m.groups()[0]:
# already got this call
return
else:
self.callerid_branch = m.groups()[0]
self.logger.info("Incoming call from '%s'" % callerid)
if self.url:
self.logger.debug("Calling URL %s" % self.url.replace("CALLERID", callerid))
requests.get(self.url.replace("CALLERID", callerid))
def sendsip(self, msg, branch=None, callid=None, remote_tag=None):
if self.transport.getHost().host == "0.0.0.0":
self.transport.connect(self.server, self.port)
self.myip = self.transport.getHost().host
if not callid:
callid = "1234"+self.tag
if not branch:
branch = "z9hG4bK7894"+''.join([random.choice(string.letters + string.digits) for i in range(32)])
if not remote_tag:
remote_tag = ''.join([random.choice(string.digits) for i in range(10)])
self.transport.write(string.Template(msg).substitute({"authname": self.authname,
"branch": branch,
"tag": self.tag,
"callid": callid,
"remote_tag": remote_tag,
"myip": self.myip,
"number": self.number,
"realm": self.realm,
"server": self.server,
"seq": self.seq,
"port": self.port,
"response": self.response,
"nonce": self.nonce}))
return
class Daemon:
"""
A generic daemon class.
Usage: subclass the Daemon class and override the run() method
"""
def __init__(self, pidfile, stdin='/dev/null', stdout='/dev/null', stderr='/dev/null'):
self.stdin = stdin
self.stdout = stdout
self.stderr = stderr
self.pidfile = pidfile
def daemonize(self):
"""
do the UNIX double-fork magic, see Stevens' "Advanced
Programming in the UNIX Environment" for details (ISBN 0201563177)
http://www.erlenstar.demon.co.uk/unix/faq_2.html#SEC16
"""
try:
pid = os.fork()
if pid > 0:
# exit first parent
sys.exit(0)
except OSError, e:
sys.stderr.write("fork #1 failed: %d (%s)\n" % (e.errno, e.strerror))
sys.exit(1)
# decouple from parent environment
os.chdir("/")
os.setsid()
os.umask(0)
# do second fork
try:
pid = os.fork()
if pid > 0:
# exit from second parent
sys.exit(0)
except OSError, e:
sys.stderr.write("fork #2 failed: %d (%s)\n" % (e.errno, e.strerror))
sys.exit(1)
# redirect standard file descriptors
sys.stdout.flush()
sys.stderr.flush()
si = file(self.stdin, 'r')
so = file(self.stdout, 'a+')
se = file(self.stderr, 'a+', 0)
os.dup2(si.fileno(), sys.stdin.fileno())
os.dup2(so.fileno(), sys.stdout.fileno())
os.dup2(se.fileno(), sys.stderr.fileno())
# write pidfile
atexit.register(self.delpid)
pid = str(os.getpid())
file(self.pidfile,'w+').write("%s\n" % pid)
def delpid(self):
os.remove(self.pidfile)
def start(self, logger):
"""
Start the daemon
"""
# Check for a pidfile to see if the daemon already runs
try:
pf = file(self.pidfile,'r')
pid = int(pf.read().strip())
pf.close()
except IOError:
pid = None
if pid:
message = "pidfile %s already exist. Daemon already running?\n"
sys.stderr.write(message % self.pidfile)
return False
# Start the daemon
self.daemonize()
self.run(logger)
return True
def stop(self, logger):
"""
Stop the daemon
"""
# Get the pid from the pidfile
try:
pf = file(self.pidfile,'r')
pid = int(pf.read().strip())
pf.close()
except IOError:
pid = None
if not pid:
message = "pidfile %s does not exist. Daemon not running?\n"
sys.stderr.write(message % self.pidfile)
return # not an error in a restart
logger.info("Stopping")
# Try killing the daemon process
try:
while 1:
os.kill(pid, SIGTERM)
time.sleep(0.1)
except OSError, err:
err = str(err)
if err.find("No such process") > 0:
if os.path.exists(self.pidfile):
os.remove(self.pidfile)
else:
print str(err)
sys.exit(1)
def restart(self, logger):
"""
Restart the daemon
"""
self.stop(logger)
self.start(logger)
def run(self):
"""
You should override this method when you subclass Daemon. It will be called after the process has been
daemonized by start() or restart().
"""
if __name__ == "__main__":
main()