18 usage = "usage: %prog [options] <enabled-addresses>"
20 parser = optparse.OptionParser(usage=usage)
23 "-d", "--poll-delay", dest="poll_delay", metavar="SECONDS", type="float",
25 help = "Multicast subscription polling interval")
27 "-D", "--refresh-delay", dest="refresh_delay", metavar="SECONDS", type="float",
29 help = "Full-refresh interval - time between full IGMP reports")
31 "-p", "--fwd-path", dest="fwd_path", metavar="PATH",
32 default = "/var/run/mcastfwd",
33 help = "Path of the unix socket in which the program will listen for packets")
35 "-r", "--router-path", dest="mrt_path", metavar="PATH",
36 default = "/var/run/mcastrt",
37 help = "Path of the unix socket in which the program will listen for routing changes")
39 "-A", "--announce-only", dest="announce_only", action="store_true",
41 help = "If given, only group membership announcements will be made. "
42 "Useful for non-router non-member multicast nodes.")
44 "-R", "--no-router", dest="no_router", action="store_true",
46 help = "If given, only group membership announcements and forwarding to the default multicast egress will be made. "
47 "Useful for non-router but member multicast nodes.")
49 "-v", "--verbose", dest="verbose", action="store_true",
51 help = "Log more verbosely")
53 (options, remaining_args) = parser.parse_args(sys.argv[1:])
57 level=logging.DEBUG if options.verbose else logging.WARNING)
59 ETH_P_ALL = 0x00000003
61 TUNSETIFF = 0x400454ca
62 IFF_NO_PI = 0x00001000
65 IFF_VNET_HDR = 0x00004000
66 TUN_PKT_STRIP = 0x00000001
67 IFHWADDRLEN = 0x00000006
72 class IGMPThread(threading.Thread):
73 def __init__(self, vif_addr, *p, **kw):
74 super(IGMPThread, self).__init__(*p, **kw)
76 vif_addr = vif_addr.strip()
77 self.vif_addr = vif_addr
78 self.igmp_socket = socket.socket(socket.AF_INET, socket.SOCK_RAW, socket.IPPROTO_IGMP)
79 self.igmp_socket.setsockopt(socket.IPPROTO_IP, socket.IP_MULTICAST_IF,
80 socket.inet_aton(self.vif_addr) )
81 self.igmp_socket.setsockopt(socket.IPPROTO_IP, socket.IP_HDRINCL, 1)
82 self.igmp_socket.setsockopt(socket.IPPROTO_IP, socket.IP_MULTICAST_TTL, 1)
87 proc = subprocess.Popen(['ip','addr','show'],
88 stdout = subprocess.PIPE,
89 stderr = subprocess.STDOUT,
90 stdin = open('/dev/null','r+b') )
92 heading = re.compile(r"\d+:\s*([-a-zA-Z0-9_]+):.*")
93 addr = re.compile(r"\s*inet\s*(\d{1,3}[.]\d{1,3}[.]\d{1,3}[.]\d{1,3}).*")
94 for line in proc.stdout:
95 match = heading.match(line)
97 tun_name = match.group(1)
99 match = addr.match(line)
100 if match and match.group(1) == vif_addr:
101 self.tun_name = tun_name
104 raise RuntimeError, "Could not find iterface for", vif_addr
107 devnull = open('/dev/null','r+b')
108 maddr_re = re.compile(r"\s*inet\s*(\d{1,3}[.]\d{1,3}[.]\d{1,3}[.]\d{1,3})\s*")
110 lastfullrefresh = time.time()
111 while not self._stop:
112 # Get current subscriptions @ vif
113 proc = subprocess.Popen(['ip','maddr','show',self.tun_name],
114 stdout = subprocess.PIPE,
115 stderr = subprocess.STDOUT,
118 for line in proc.stdout:
119 match = maddr_re.match(line)
121 new_maddr.add(match.group(1))
124 # Get current subscriptions @ eth0 (default on PL),
125 # they should be considered "universal" suscriptions.
126 proc = subprocess.Popen(['ip','maddr','show', 'eth0'],
127 stdout = subprocess.PIPE,
128 stderr = subprocess.STDOUT,
131 for line in proc.stdout:
132 match = maddr_re.match(line)
134 new_maddr.add(match.group(1))
137 # Every now and then, send a full report
139 report_new = new_maddr
140 if (now - lastfullrefresh) <= options.refresh_delay:
141 report_new = report_new - cur_maddr
143 lastfullrefresh = now
145 # Report subscriptions
146 for grp in report_new:
147 print >>sys.stderr, "JOINING", grp
148 igmpp = ipaddr2.ipigmp(
149 self.vif_addr, grp, 1, 0x16, 0, grp,
152 self.igmp_socket.sendto(igmpp, 0, (grp,0))
154 traceback.print_exc(file=sys.stderr)
157 for grp in cur_maddr - new_maddr:
158 print >>sys.stderr, "LEAVING", grp
159 igmpp = ipaddr2.ipigmp(
160 self.vif_addr, '224.0.0.2', 1, 0x17, 0, grp,
163 self.igmp_socket.sendto(igmpp, 0, ('224.0.0.2',0))
165 traceback.print_exc(file=sys.stderr)
167 cur_maddr = new_maddr
169 time.sleep(options.poll_delay)
173 self.join(1+5*options.poll_delay)
176 class FWDThread(threading.Thread):
177 def __init__(self, rt_cache, router_socket, vifs, *p, **kw):
178 super(FWDThread, self).__init__(*p, **kw)
180 self.in_socket = socket.socket(socket.AF_UNIX, socket.SOCK_DGRAM)
181 self.in_socket.bind(options.fwd_path)
183 self.pending = collections.deque()
184 self.maxpending = 1000
185 self.rt_cache = rt_cache
186 self.router_socket = router_socket
189 # prepare forwarding sockets
190 self.fwd_sockets = {}
191 for fwd_target in remaining_args:
192 fwd_target = socket.inet_aton(fwd_target)
193 fwd_socket = socket.socket(socket.AF_INET, socket.SOCK_RAW, socket.IPPROTO_RAW)
194 fwd_socket.setsockopt(socket.IPPROTO_IP, socket.IP_HDRINCL, 1)
195 fwd_socket.setsockopt(socket.IPPROTO_IP, socket.IP_MULTICAST_IF, fwd_target)
196 fwd_socket.setsockopt(socket.IPPROTO_IP, socket.IP_MULTICAST_TTL, 1)
197 self.fwd_sockets[fwd_target] = fwd_socket
199 # we always forward to eth0
200 # In PL, we cannot join the multicast routers in eth0,
201 # that would bring a lot of trouble. But we can
202 # listen there for subscriptions and forward interesting
203 # packets, partially joining the mbone
204 # TODO: IGMP messages from eth0 should be selectively
205 # replicated in all vifs to propagate external
206 # subscriptions. It is complex though.
207 fwd_target = '\x00'*4
208 fwd_socket = socket.socket(socket.AF_INET, socket.SOCK_RAW, socket.IPPROTO_RAW)
209 fwd_socket.setsockopt(socket.IPPROTO_IP, socket.IP_HDRINCL, 1)
210 fwd_socket.setsockopt(socket.IPPROTO_IP, socket.IP_MULTICAST_IF, fwd_target)
211 fwd_socket.setsockopt(socket.IPPROTO_IP, socket.IP_MULTICAST_TTL, 1)
212 self.fwd_sockets[fwd_target] = fwd_socket
218 in_socket = self.in_socket
219 rt_cache = self.rt_cache
221 router_socket = self.router_socket
225 pending = self.pending
226 in_socket.settimeout(options.poll_delay)
228 enumerate_ = enumerate
229 fwd_sockets = self.fwd_sockets
232 def_socket = fwd_sockets['\x00\x00\x00\x00']
234 while not self._stop:
237 if pending and npending:
238 packet = pending.pop()
241 packet = in_socket.recv(2000)
242 except socket.timeout, e:
243 if pending and not npending:
244 npending = len_(pending)
246 if not packet or len_(packet) < 24:
251 packet = buffer_(packet,4)
253 if packet[9] == '\x02':
254 # IGMP packet? It's for mrouted
256 router_socket.send(packet)
257 elif packet[9] == '\x00':
258 # LOOPING packet, discard
264 addrinfo = packet[12:20]
265 fwd_targets, rparent = rt_cache.get(addrinfo, noent)
267 if fwd_targets is not None and (rparent == '\x00\x00\x00\x00' or rparent == parent):
269 ttl = ord_(packet[8])
270 tgt_group = (socket.inet_ntoa(addrinfo[4:]),0)
271 print >>sys.stderr, map(socket.inet_ntoa, (parent, addrinfo[:4], addrinfo[4:])), "-> ttl", ttl,
272 nfwd_targets = len_(fwd_targets)
273 for vifi, vif in vifs.iteritems():
274 if vifi < nfwd_targets:
275 ttl_thresh = ord_(fwd_targets[vifi])
276 if ttl_thresh > 0 and ttl > ttl_thresh:
277 if vif[4] in fwd_sockets:
279 print >>sys.stderr, socket.inet_ntoa(vif[4]),
280 fwd_socket = fwd_sockets[vif[4]]
281 fwd_socket.sendto(packet, 0, tgt_group)
287 print >>sys.stderr, 'default',
288 def_socket.sendto(packet, 0, tgt_group)
292 print >>sys.stderr, "."
295 if len_(pending) < self.maxpending:
296 tgt_group = addrinfo[4:]
297 print >>sys.stderr, map(socket.inet_ntoa, (parent, addrinfo[:4], addrinfo[4:])), "-> ?"
299 pending.append(fullpacket)
301 # Notify mrouted by forwarding it with protocol 0
302 router_socket.send(''.join(
303 (packet[:9],'\x00',packet[10:]) ))
306 ttl = ord_(packet[8])
307 tgt_group = (socket.inet_ntoa(addrinfo[4:]),0)
310 print >>sys.stderr, map(socket.inet_ntoa, (parent, addrinfo[:4], addrinfo[4:])), "-> ttl", ttl, 'default'
311 def_socket.sendto(packet, 0, tgt_group)
317 self.join(1+5*options.poll_delay)
320 class RouterThread(threading.Thread):
321 def __init__(self, rt_cache, router_socket, vifs, *p, **kw):
322 super(RouterThread, self).__init__(*p, **kw)
324 self.rt_cache = rt_cache
326 self.router_socket = router_socket
332 rt_cache = self.rt_cache
335 router_socket = self.router_socket
336 router_socket.settimeout(options.poll_delay)
343 MRT_ADD_VIF = MRT_BASE+2 # Add a virtual interface
344 MRT_DEL_VIF = MRT_BASE+3 # Delete a virtual interface
345 MRT_ADD_MFC = MRT_BASE+4 # Add a multicast forwarding entry
346 MRT_DEL_MFC = MRT_BASE+5 # Delete a multicast forwarding entry
348 def cmdhdr(cmd, unpack=struct.unpack, buffer=buffer):
349 op,dlen = unpack('II', buffer(cmd,0,8))
352 def vifctl(data, unpack=struct.unpack):
353 #vifi, flags,threshold,rate_limit,lcl_addr,rmt_addr = unpack('HBBI4s4s', data)
354 return unpack('HBBI4s4s', data)
355 def mfcctl(data, unpack=struct.unpack):
356 #origin,mcastgrp,parent,ttls,pkt_cnt,byte_cnt,wrong_if,expire = unpack('4s4sH10sIIIi', data)
357 return unpack('4s4sH32sIIIi', data)
363 addr_vifs[vifi[4]] = vifi[0]
364 print >>sys.stderr, "Added VIF", vifi
368 del addr_vifs[vifi[4]]
370 print >>sys.stderr, "Removed VIF", vifi
372 origin,mcastgrp,parent,ttls,pkt_cnt,byte_cnt,wrong_if,expire = mfcctl(data)
374 parent_addr = vifs[parent][4]
376 parent_addr = '\x00\x00\x00\x00'
377 addrinfo = origin + mcastgrp
378 rt_cache[addrinfo] = (ttls, parent_addr)
379 print >>sys.stderr, "Added RT", '-'.join(map(socket.inet_ntoa,(parent_addr,origin,mcastgrp))), map(ord,ttls)
381 origin,mcastgrp,parent,ttls,pkt_cnt,byte_cnt,wrong_if,expire = mfcctl(data)
383 parent_addr = vifs[parent][4]
385 parent_addr = '\x00\x00\x00\x00'
386 addrinfo = origin + mcastgrp
387 del rt_cache[addrinfo]
388 print >>sys.stderr, "Removed RT", '-'.join(map(socket.inet_ntoa,(parent_addr,origin,mcastgrp)))
391 MRT_ADD_VIF : add_vif,
392 MRT_DEL_VIF : del_vif,
393 MRT_ADD_MFC : add_mfc,
394 MRT_DEL_MFC : del_mfc,
397 while not self._stop:
398 if len_(buf) < 8 or len_(buf) < (cmdhdr(buf)[1]+8):
401 cmd = router_socket.recv(2000)
402 except socket.timeout, e:
405 print >>sys.stderr, "PLRT CONNECTION BROKEN"
406 TERMINATE.append(None)
416 op,dlen,data = cmdhdr(cmd)
417 if len_(data) < dlen:
420 buf = buffer_(data, dlen)
421 data = buffer_(data, 0, dlen)
423 print >>sys.stderr, "COMMAND", op, "DATA", dlen
429 traceback.print_exc(file=sys.stderr)
431 print >>sys.stderr, "IGNORING UNKNOWN COMMAND", op
435 self.join(1+5*options.poll_delay)
440 for vif_addr in remaining_args:
441 igmp_threads.append(IGMPThread(vif_addr))
448 def _finalize(sig,frame):
450 TERMINATE.append(None)
451 signal.signal(signal.SIGTERM, _finalize)
455 if not options.announce_only and not options.no_router:
456 router_socket = socket.socket(socket.AF_UNIX, socket.SOCK_SEQPACKET)
457 router_socket.bind(options.mrt_path)
458 router_socket.listen(0)
459 router_remote_socket, router_remote_addr = router_socket.accept()
460 router_thread = RouterThread(rt_cache, router_remote_socket, vifs)
462 router_remote_socket = None
465 if not options.announce_only:
466 fwd_thread = FWDThread(rt_cache, router_remote_socket, vifs)
468 for thread in igmp_threads:
471 if not options.announce_only:
473 if not options.no_router and not options.announce_only:
474 router_thread.start()
479 if os.path.exists(options.mrt_path):
481 os.remove(options.mrt_path)
484 if os.path.exists(options.fwd_path):
486 os.remove(options.fwd_path)