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sip-dmr-gateway/core.py
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import json
from bitstring import BitArray
import asyncio
import struct
import time
import os
import audioop
from vocoder_engine import VocoderEngine
from openbridge_protocol import crea_pacchetto_ping, calcola_hmac
from dmr_utils3.ambe_utils import convert49BitTo72BitAMBE, convert72BitTo49BitAMBE
# ====================================================================
# CARICAMENTO CONFIGURAZIONI (JSON)
# ====================================================================
def carica_config():
try:
with open("config.json", "r") as f:
return json.load(f)
except Exception as e:
print(f"[ERRORE CRITICO] File config.json non trovato o errato ({e}). Chiusura.")
exit(1)
CONFIG = carica_config()
HBLINK_IP = CONFIG.get("hblink_ip", "127.0.0.1")
HBLINK_PORT = CONFIG.get("hblink_port", 62047)
HBLINK_PASSWORD = CONFIG.get("hblink_password", "TestVOIP")
PEER_ID = CONFIG.get("peer_id", 22241)
SIP_PORT = CONFIG.get("sip_port", 55060)
RTP_PORT = CONFIG.get("rtp_port", 10000)
VOCODER_HOST = CONFIG.get("vocoder_host", "127.0.0.1")
VOCODER_PORT = CONFIG.get("vocoder_port", 2470)
# --- NUOVA VARIABILE PER LA SICUREZZA IP ---
FREEPBX_IP = CONFIG.get("freepbx_ip", "127.0.0.1")
def carica_rubrica():
try:
with open("utenti.json", "r") as f:
return json.load(f)
except Exception as e:
return {}
UTENTI_SIP_DMR = carica_rubrica()
# ====================================================================
# CLASSE SESSIONE SIP (Con Buffer DTMF per il cambio TG)
# ====================================================================
class SessioneSIP:
def __init__(self, call_id, chiamante, destinatario_tg, rtp_addr, sip_addr, full_from, full_to, ip_vps):
self.call_id = call_id
self.chiamante = chiamante
self.tg_destinazione = str(destinatario_tg)
self.dmr_id = int(UTENTI_SIP_DMR.get(str(chiamante), 2223619))
self.rtp_client_addr = rtp_addr
self.sip_client_addr = sip_addr
self.ip_vps = ip_vps
self.rtp_seq = 0
self.rtp_timestamp = 0
self.dialog_to = full_from
self.dialog_from = full_to.split(';')[0] + ";tag=987654"
self.local_cseq = 10
self.ptt_attivo = False
self.buffer_ambe = []
self.seq_dmr = 0
self.stream_id = os.urandom(4)
self.ultimo_src_id = None
# --- VARIABILI PER IL CAMBIO TG TRAMITE DTMF ---
self.dtmf_buffer = ""
self.dtmf_task = None
self.ultimo_tempo_rtp_dtmf = 0
self.ultimo_evento_dtmf = None
class OpenBridgeClient(asyncio.DatagramProtocol):
def __init__(self, manager):
self.transport = None
self.manager = manager
def connection_made(self, transport):
self.transport = transport
print(f"[OpenBridge] Socket connesso a {HBLINK_IP}:{HBLINK_PORT}")
asyncio.create_task(self.keepalive_loop())
def datagram_received(self, data, addr):
if len(data) < 53:
return
if data.startswith(b"DMRD") and len(data) >= 73:
src_id = int.from_bytes(data[5:8], 'big')
tg_arrivo = str(int.from_bytes(data[8:11], 'big'))
# Il routing è dinamico: filtra in base al tg_destinazione attuale della sessione
sessioni_interessate = [s for s in self.manager.sessioni.values() if s.tg_destinazione == tg_arrivo]
if not sessioni_interessate: return
print("D", end="", flush=True)
payload_33 = data[20:53]
ambe1 = payload_33[0:9]
ambe2 = bytearray(9)
ambe2[0:4] = payload_33[9:13]
ambe2[4] = (payload_33[13] & 0xF0) | (payload_33[19] & 0x0F)
ambe2[5:9] = payload_33[20:24]
ambe3 = payload_33[24:33]
frame_uniti = ambe1 + bytes(ambe2) + ambe3
self.manager.ricevi_frame_dmr_multi(frame_uniti, sessioni_interessate, src_id)
async def keepalive_loop(self):
while True:
if self.transport:
pacchetto_ping = crea_pacchetto_ping(PEER_ID, HBLINK_PASSWORD)
self.transport.sendto(pacchetto_ping)
await asyncio.sleep(10)
def apri_flusso_chiamata(self, sess):
if not self.transport: return
flags = 0
payload_base = struct.pack("!3sB I 4s B I I", b"OPB", 0x80, PEER_ID, sess.stream_id, flags, sess.dmr_id, int(sess.tg_destinazione))
firma_hmac = calcola_hmac(HBLINK_PASSWORD, payload_base)
self.transport.sendto(payload_base + firma_hmac)
def invia_dmrd_voce(self, sess, payload_ambe):
if not self.transport: return
try:
magic = b"DMRD"
seq_byte = struct.pack("B", sess.seq_dmr)
src_bytes = sess.dmr_id.to_bytes(3, 'big')
dst_bytes = int(sess.tg_destinazione).to_bytes(3, 'big')
peer_bytes = PEER_ID.to_bytes(4, 'big')
flags_byte = struct.pack("B", 0x00)
header = magic + seq_byte + src_bytes + dst_bytes + peer_bytes + flags_byte + sess.stream_id
payload_ambe = payload_ambe.ljust(27, b'\x00')
ambe1 = payload_ambe[0:9]
ambe2 = payload_ambe[9:18]
ambe3 = payload_ambe[18:27]
payload_33 = bytearray(33)
payload_33[0:9] = ambe1
payload_33[9:13] = ambe2[0:4]
payload_33[13] = ambe2[4] & 0xF0
payload_33[19] = ambe2[4] & 0x0F
payload_33[20:24] = ambe2[5:9]
payload_33[24:33] = ambe3
pacchetto_base = header + bytes(payload_33)
firma_hmac = calcola_hmac(HBLINK_PASSWORD, pacchetto_base)
self.transport.sendto(pacchetto_base + firma_hmac)
except Exception:
pass
def chiudi_flusso_chiamata(self, sess):
if not self.transport: return
magic = b"DMRD"
flags_byte = struct.pack("B", 0x02)
src_bytes = sess.dmr_id.to_bytes(3, 'big')
dst_bytes = int(sess.tg_destinazione).to_bytes(3, 'big')
peer_bytes = PEER_ID.to_bytes(4, 'big')
for i in range(3):
seq_byte = struct.pack("B", (sess.seq_dmr + i) % 256)
header = magic + seq_byte + src_bytes + dst_bytes + peer_bytes + flags_byte + sess.stream_id
pacchetto_base = header + (b'\x00' * 33)
firma_hmac = calcola_hmac(HBLINK_PASSWORD, pacchetto_base)
self.transport.sendto(pacchetto_base + firma_hmac)
# ====================================================================
# GESTORE CENTRALE DELLE SESSIONI
# ====================================================================
class SessionManager:
def __init__(self):
self.vocoder = VocoderEngine(mode="emulator", host=VOCODER_HOST, port=VOCODER_PORT)
self.openbridge = None
self.rtp_transport = None
self.sip_transport = None
self.sessioni = {}
async def avvia(self):
await self.vocoder.avvia()
loop = asyncio.get_running_loop()
_, self.openbridge = await loop.create_datagram_endpoint(
lambda: OpenBridgeClient(self),
local_addr=('0.0.0.0', HBLINK_PORT),
remote_addr=(HBLINK_IP, HBLINK_PORT)
)
print(f"[Core] PBX Multi-Utente avviato. SIP su porta {SIP_PORT}...\n")
print(f"[Security] Accetto connessioni SIP SOLO da: {FREEPBX_IP}\n")
def trova_sessione_per_rtp(self, addr):
for sess in self.sessioni.values():
if sess.rtp_client_addr and sess.rtp_client_addr[0] == addr[0]:
sess.rtp_client_addr = addr
return sess
return None
def gestisci_nuova_chiamata(self, call_id, chiamante, destinatario, rtp_addr, sip_addr, full_from, full_to, ip_vps):
sess = SessioneSIP(call_id, chiamante, destinatario, rtp_addr, sip_addr, full_from, full_to, ip_vps)
self.sessioni[call_id] = sess
print(f"\n[Core] >>> SIP {chiamante} -> TG {destinatario} | ID: {sess.dmr_id}")
def termina_chiamata(self, call_id):
if call_id in self.sessioni:
sess = self.sessioni[call_id]
if sess.ptt_attivo and self.openbridge:
self.openbridge.chiudi_flusso_chiamata(sess)
del self.sessioni[call_id]
def gestisci_ptt(self, sess, stato):
if stato is True and not sess.ptt_attivo:
sess.ptt_attivo = True
sess.buffer_ambe = []
sess.seq_dmr = 0
sess.stream_id = os.urandom(4)
if self.openbridge: self.openbridge.apri_flusso_chiamata(sess)
elif stato is False and sess.ptt_attivo:
sess.ptt_attivo = False
if self.openbridge: self.openbridge.chiudi_flusso_chiamata(sess)
# --- LOGICA CAMBIO TG (DTMF 0-9) ---
def gestisci_dtmf_digit(self, sess, digit):
if sess.ptt_attivo: return # Evita di cambiare TG mentre sei in TX
sess.dtmf_buffer += str(digit)
# Resetta il task esistente se si preme un altro numero velocemente
if sess.dtmf_task:
sess.dtmf_task.cancel()
sess.dtmf_task = asyncio.create_task(self.attendi_cambio_tg(sess))
async def attendi_cambio_tg(self, sess):
try:
# Attende 2.5 secondi dalla pressione dell'ultimo tasto
await asyncio.sleep(2.5)
if sess.dtmf_buffer:
nuovo_tg = sess.dtmf_buffer
sess.dtmf_buffer = "" # Svuota il buffer
print(f"\n[Core] *** CAMBIO TG: {sess.chiamante} è passato al Talkgroup {nuovo_tg} ***")
sess.tg_destinazione = nuovo_tg
# Notifica il telefono del cambio avvenuto
self.notifica_display(sess, f"TG: {nuovo_tg}")
except asyncio.CancelledError:
pass # Il task è stato annullato perché l'utente ha premuto un altro tasto
# --- FUNZIONE DISPLAY GENERICA (Ora accetta stringhe personalizzate) ---
def notifica_display(self, sess, testo_display):
if not self.sip_transport or not sess.sip_client_addr:
return
sess.local_cseq += 1
branch = f"z9hG4bK-{os.urandom(4).hex()}"
client_sip_ip, client_sip_port = sess.sip_client_addr
sdp = (f"v=0\r\no=- 12345 12345 IN IP4 {sess.ip_vps}\r\ns=Talk\r\n"
f"c=IN IP4 {sess.ip_vps}\r\nt=0 0\r\nm=audio {RTP_PORT} RTP/AVP 8 101\r\n"
f"a=rtpmap:8 PCMA/8000\r\na=rtpmap:101 telephone-event/8000\r\na=sendrecv\r\n")
sip_reinvite = (
f"INVITE sip:{sess.chiamante}@{client_sip_ip}:{client_sip_port} SIP/2.0\r\n"
f"Via: SIP/2.0/UDP 127.0.0.1:{SIP_PORT};branch={branch}\r\n"
f"Max-Forwards: 70\r\n"
f"From: {sess.dialog_from}\r\n"
f"To: {sess.dialog_to}\r\n"
f"Call-ID: {sess.call_id}\r\n"
f"CSeq: {sess.local_cseq} INVITE\r\n"
f"Contact: <sip:gateway@127.0.0.1:{SIP_PORT}>\r\n"
f"Remote-Party-ID: \"{testo_display}\" <sip:000@127.0.0.1>;party=called;screen=yes;privacy=off\r\n"
f"P-Asserted-Identity: \"{testo_display}\" <sip:000@127.0.0.1>\r\n"
f"Content-Type: application/sdp\r\n"
f"Content-Length: {len(sdp)}\r\n"
f"\r\n"
f"{sdp}"
)
self.sip_transport.sendto(sip_reinvite.encode('utf-8'), sess.sip_client_addr)
def ricevi_frame_dmr_multi(self, ambe_frames, sessioni_interessate, src_id):
ascoltatori = [s for s in sessioni_interessate if not s.ptt_attivo]
if not ascoltatori or not self.rtp_transport: return
for sess in ascoltatori:
if sess.ultimo_src_id != src_id:
sess.ultimo_src_id = src_id
self.notifica_display(sess, f"RX: {src_id}")
asyncio.create_task(self.processa_audio_dmr(ambe_frames, ascoltatori))
async def processa_audio_dmr(self, ambe_27_bytes, ascoltatori):
try:
for i in range(0, len(ambe_27_bytes), 9):
frame_9 = ambe_27_bytes[i:i+9]
if len(frame_9) < 9: continue
try:
ambe_49_bits = convert72BitTo49BitAMBE(BitArray(bytes=frame_9))
ba_49 = ambe_49_bits if isinstance(ambe_49_bits, BitArray) else BitArray(ambe_49_bits)
if len(ba_49) < 56: ba_49.append(BitArray(uint=0, length=56 - len(ba_49)))
frame_7 = ba_49.bytes[:7]
except Exception: continue
pcm_data = await self.vocoder.converti_ambe_in_pcm(frame_7)
if not pcm_data or len(pcm_data) < 2: continue
if len(pcm_data) % 2 != 0: pcm_data = pcm_data[:-1]
pcma_data = audioop.lin2alaw(pcm_data, 2)
for sess in ascoltatori:
header = bytearray(12)
header[0] = 0x80; header[1] = 0x08
header[2:4] = struct.pack("!H", sess.rtp_seq)
header[4:8] = struct.pack("!I", sess.rtp_timestamp)
header[8:12] = struct.pack("!I", 0x12345678)
rtp_packet = header + pcma_data
if sess.rtp_client_addr:
self.rtp_transport.sendto(rtp_packet, sess.rtp_client_addr)
sess.rtp_seq = (sess.rtp_seq + 1) % 65536
sess.rtp_timestamp = (sess.rtp_timestamp + 160) % 4294967296
except Exception:
pass
async def processa_audio_rtp(self, sess, rtp_payload):
if not sess.ptt_attivo: return
try:
ambe_bytes = await asyncio.wait_for(self.vocoder.converti_rtp_in_ambe(rtp_payload), timeout=0.1)
if not ambe_bytes: return
dim_frame = 7 if len(ambe_bytes) % 7 == 0 else 9
for i in range(0, len(ambe_bytes), dim_frame):
frame = ambe_bytes[i:i+dim_frame]
if len(frame) == 7:
stringa_bit = BitArray(bytes=frame).bin
ambe_49_bits = [int(b) for b in stringa_bit[:49]]
fec_9_byte = convert49BitTo72BitAMBE(ambe_49_bits)
sess.buffer_ambe.append(bytes(fec_9_byte))
elif len(frame) == 9:
sess.buffer_ambe.append(frame)
while len(sess.buffer_ambe) >= 3:
payload_vocale = b''.join(sess.buffer_ambe[:3])
sess.buffer_ambe = sess.buffer_ambe[3:]
self.openbridge.invia_dmrd_voce(sess, payload_vocale)
sess.seq_dmr = (sess.seq_dmr + 1) % 256
except Exception:
pass
# ====================================================================
# PROTOCOLLI DI RETE SIP/RTP
# ====================================================================
class RtpProtocol(asyncio.DatagramProtocol):
def __init__(self, manager): self.manager = manager
def connection_made(self, transport): self.manager.rtp_transport = transport
def datagram_received(self, data, addr):
sess = self.manager.trova_sessione_per_rtp(addr)
if not sess or len(data) < 12: return
payload_type = data[1] & 0x7F
if payload_type == 8:
asyncio.create_task(self.manager.processa_audio_rtp(sess, data[12:]))
elif payload_type == 101:
evento_dtmf = data[12]
# Meccanismo anti-rimbalzo (Debounce) per ignorare i frame duplicati
ora = time.time()
if ora - sess.ultimo_tempo_rtp_dtmf < 0.2 and sess.ultimo_evento_dtmf == evento_dtmf:
return
sess.ultimo_tempo_rtp_dtmf = ora
sess.ultimo_evento_dtmf = evento_dtmf
# Esecuzione dei Comandi
if evento_dtmf == 10:
self.manager.gestisci_ptt(sess, True)
elif evento_dtmf == 11:
self.manager.gestisci_ptt(sess, False)
elif 0 <= evento_dtmf <= 9:
self.manager.gestisci_dtmf_digit(sess, evento_dtmf)
class SipProtocol(asyncio.DatagramProtocol):
def __init__(self, manager): self.manager = manager
def connection_made(self, transport):
self.transport = transport
self.manager.sip_transport = transport
def datagram_received(self, data, addr):
# --- SICUREZZA: BLOCCO IP ---
if addr[0] != FREEPBX_IP and FREEPBX_IP != "0.0.0.0":
# Decommenta la riga sotto se vuoi vedere i log dei tentativi bloccati
# print(f"[SECURITY] Rifiutato pacchetto SIP da IP non autorizzato: {addr[0]}")
return
# ----------------------------
msg = data.decode('utf-8', errors='ignore')
headers = {line.split(":", 1)[0].strip().upper(): line.split(":", 1)[1].strip() for line in msg.split('\r\n')[1:] if ":" in line}
call_id = headers.get('CALL-ID', '')
if msg.startswith("OPTIONS"):
resp = (f"SIP/2.0 200 OK\r\nVia: {headers.get('VIA', '')}\r\n"
f"From: {headers.get('FROM', '')}\r\nTo: {headers.get('TO', '')}\r\n"
f"Call-ID: {call_id}\r\nCSeq: {headers.get('CSEQ', '')}\r\n"
f"Contact: <sip:gateway@127.0.0.1:{SIP_PORT}>\r\n"
f"Content-Length: 0\r\n\r\n")
self.transport.sendto(resp.encode('utf-8'), addr)
elif msg.startswith("INVITE"):
client_rtp_port = 4000
for line in msg.split('\n'):
line = line.strip()
if line.startswith("m=audio "): client_rtp_port = int(line.split()[1])
ip_vps = "127.0.0.1"
if "@" in headers.get("TO", ""): ip_vps = headers.get("TO", "").split("@")[1].split(">")[0]
chiamante = headers.get("FROM", "").split("sip:")[1].split("@")[0]
destinatario = headers.get("TO", "").split("sip:")[1].split("@")[0]
full_from = headers.get('FROM', '')
full_to = headers.get('TO', '')
self.manager.gestisci_nuova_chiamata(call_id, chiamante, destinatario, (addr[0], client_rtp_port), addr, full_from, full_to, ip_vps)
sdp = (f"v=0\r\no=- 12345 12345 IN IP4 {ip_vps}\r\ns=Talk\r\n"
f"c=IN IP4 {ip_vps}\r\nt=0 0\r\nm=audio {RTP_PORT} RTP/AVP 8 101\r\n"
f"a=rtpmap:8 PCMA/8000\r\na=rtpmap:101 telephone-event/8000\r\na=sendrecv\r\n")
resp = (f"SIP/2.0 200 OK\r\nVia: {headers.get('VIA', '')}\r\n"
f"From: {full_from}\r\nTo: {full_to};tag=987654\r\n"
f"Call-ID: {call_id}\r\nCSeq: {headers.get('CSEQ', '')}\r\n"
f"Contact: <sip:gateway@{ip_vps}:{SIP_PORT}>\r\nContent-Type: application/sdp\r\n"
f"Content-Length: {len(sdp)}\r\n\r\n{sdp}")
self.transport.sendto(resp.encode('utf-8'), addr)
elif msg.startswith("SIP/2.0 200 OK"):
if "INVITE" in headers.get('CSEQ', ''):
cseq_num = headers.get('CSEQ', '').split()[0]
ack_uri = f"sip:{addr[0]}:{addr[1]}"
if "CONTACT" in headers:
contact_hdr = headers["CONTACT"]
if "<" in contact_hdr:
ack_uri = contact_hdr.split("<")[1].split(">")[0]
ack = (f"ACK {ack_uri} SIP/2.0\r\n"
f"Via: SIP/2.0/UDP 127.0.0.1:{SIP_PORT};branch=z9hG4bK-{os.urandom(4).hex()}\r\n"
f"Max-Forwards: 70\r\n"
f"From: {headers.get('FROM', '')}\r\n"
f"To: {headers.get('TO', '')}\r\n"
f"Call-ID: {call_id}\r\n"
f"CSeq: {cseq_num} ACK\r\n"
f"Content-Length: 0\r\n\r\n")
self.transport.sendto(ack.encode('utf-8'), addr)
elif msg.startswith("BYE"):
self.manager.termina_chiamata(call_id)
resp = (f"SIP/2.0 200 OK\r\nVia: {headers.get('VIA', '')}\r\n"
f"From: {headers.get('FROM', '')}\r\nTo: {headers.get('TO', '')}\r\n"
f"Call-ID: {call_id}\r\nCSeq: {headers.get('CSEQ', '')}\r\n"
f"Content-Length: 0\r\n\r\n")
self.transport.sendto(resp.encode('utf-8'), addr)
async def main():
loop = asyncio.get_running_loop()
manager = SessionManager()
await manager.avvia()
_, _ = await loop.create_datagram_endpoint(lambda: SipProtocol(manager), local_addr=('0.0.0.0', SIP_PORT))
_, _ = await loop.create_datagram_endpoint(lambda: RtpProtocol(manager), local_addr=('0.0.0.0', RTP_PORT))
try:
await asyncio.Event().wait()
except KeyboardInterrupt:
pass
if __name__ == "__main__":
asyncio.run(main())
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