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mirror/orionroutes.py

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Python
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#!/usr/bin/python
# Configuration
ORION_TABLE = 1 # from /etc/iproute2/rt_tables
ORION_REALMS = 1 # from /etc/iproute2/rt_realms
ORION_VIAS = [ "66.97.23.33", "66.97.28.65", "129.97.1.46" ]
ORION_GW = "129.97.134.1"
ORION_SRC = "129.97.134.42"
ORION_IFACE = "eth0"
# Don't touch anything beyond here
import sys, re, iplib, SubnetTree
from ctypes import *
NETLINK_ROUTE = 0
AF_UNSPEC = 0
RT_SCOPE_UNIVERSE = 0
RTPROT_STATIC = 4
NLM_F_REPLACE = 0x100
def die(msg):
sys.stderr.write("orionroutes.py: %s\n" % msg)
sys.exit(1)
try:
libnl = cdll.LoadLibrary("libnl.so.1")
nl_geterror = CFUNCTYPE(c_char_p) (("nl_geterror", libnl), None)
nl_handle_alloc = CFUNCTYPE(c_void_p) (("nl_handle_alloc", libnl), None)
nl_connect = CFUNCTYPE(c_int, c_void_p, c_int) \
(("nl_connect", libnl), ((1, "handle", None), (1, "type", NETLINK_ROUTE)))
rtnl_route_alloc = CFUNCTYPE(c_void_p) (("rtnl_route_alloc", libnl), None)
rtnl_link_alloc_cache = CFUNCTYPE(c_void_p, c_void_p) \
(("rtnl_link_alloc_cache", libnl), ((1, "handle", None), ))
rtnl_link_name2i = CFUNCTYPE(c_int, c_void_p, c_char_p) \
(("rtnl_link_name2i", libnl), ((1, "cache", None), (1, "iface", -1)))
rtnl_route_set_oif = CFUNCTYPE(c_void_p, c_void_p, c_int) \
(("rtnl_route_set_oif", libnl), ((1, "route", None), (1, "iface", -1)))
nl_cache_free = CFUNCTYPE(None, c_void_p) \
(("nl_cache_free", libnl), ((1, "cache", None), ))
nl_addr_parse = CFUNCTYPE(c_void_p, c_char_p, c_int) \
(("nl_addr_parse", libnl), ((1, "dst", None), (1, "family", AF_UNSPEC)))
rtnl_route_set_dst = CFUNCTYPE(c_int, c_void_p, c_void_p) \
(("rtnl_route_set_dst", libnl), ((1, "route", None), (1, "dst", None)))
rtnl_route_set_pref_src = CFUNCTYPE(c_int, c_void_p, c_void_p) \
(("rtnl_route_set_pref_src", libnl), ((1, "route", None), (1, "src", None)))
nl_addr_put = CFUNCTYPE(None, c_void_p) \
(("nl_addr_put", libnl), ((1, "addr", None), ))
rtnl_route_set_gateway = CFUNCTYPE(c_int, c_void_p, c_void_p) \
(("rtnl_route_set_gateway", libnl), ((1, "route", None), (1, "gw", None)))
rtnl_route_set_table = CFUNCTYPE(None, c_void_p, c_int) \
(("rtnl_route_set_table", libnl), ((1, "route", None), (1, "table", -1)))
rtnl_route_set_scope = CFUNCTYPE(None, c_void_p, c_int) \
(("rtnl_route_set_scope", libnl), ((1, "route", None), (1, "scope", -1)))
rtnl_route_set_protocol = CFUNCTYPE(None, c_void_p, c_int) \
(("rtnl_route_set_protocol", libnl), ((1, "route", None), (1, "proto", -1)))
rtnl_route_set_realms = CFUNCTYPE(None, c_void_p, c_int) \
(("rtnl_route_set_realms", libnl), ((1, "route", None), (1, "realms", -1)))
rtnl_route_add = CFUNCTYPE(c_int, c_void_p, c_void_p, c_int) \
(("rtnl_route_add", libnl), ((1, "handle", None), (1, "route", None), (1, "flags", 0)))
rtnl_route_put = CFUNCTYPE(None, c_void_p) \
(("rtnl_route_put", libnl), ((1, "route", None), ))
nl_handle_destroy = CFUNCTYPE(None, c_void_p) \
(("nl_handle_destroy", libnl), ((1, "handle", None), ))
rtnl_route_alloc_cache = CFUNCTYPE(c_void_p, c_void_p) \
(("rtnl_route_alloc_cache", libnl), ((1, "handle", None), ))
nl_cache_get_first = CFUNCTYPE(c_void_p, c_void_p) \
(("nl_cache_get_first", libnl), ((1, "cache", None), ))
rtnl_route_get_table = CFUNCTYPE(c_int, c_void_p) \
(("rtnl_route_get_table", libnl), ((1, "route", None), ))
rtnl_route_get_dst = CFUNCTYPE(c_void_p, c_void_p) \
(("rtnl_route_get_dst", libnl), ((1, "route", None), ))
nl_addr2str = CFUNCTYPE(c_char_p, c_void_p, c_char_p, c_int) \
(("nl_addr2str", libnl), ((1, "addr", None), (1, "buffer", None), (1, "size", 0)))
rtnl_route_del = CFUNCTYPE(c_int, c_void_p, c_void_p, c_int) \
(("rtnl_route_del", libnl), ((1, "handle", None), (1, "route", None), (1, "flags", 0)))
nl_cache_get_next = CFUNCTYPE(c_void_p, c_void_p) \
(("nl_cache_get_next", libnl), ((1, "object", None), ))
except Exception,e:
die("Failed to load libnl: %s" % e)
def nl_die(func):
die("%s: %s" % (func, nl_geterror()))
cidr_re = re.compile("(B{0,1})\\s+([0-9.]+)/{0,1}(\\d*)(.*)")
via_re = re.compile(".*?via ([0-9.]+)")
ips = [[] for i in range(33)]
last_bits = 0
count = 0
for line in sys.stdin.readlines():
cidr = cidr_re.match(line)
if cidr == None:
continue
cidr = cidr.groups()
if cidr[2] != '':
last_bits = cidr[2]
if cidr[0] != 'B':
continue
via = via_re.match(cidr[3])
if via == None or via.group(1) not in ORION_VIAS:
continue
ips[int(last_bits)].append(int(iplib.IPv4Address(cidr[1])))
count = count + 1
if count < 10: # we should never have less than 10 routes
die("Not enough routes (got %d)" % count)
cidrs = []
for bits in range(32, 1, -1):
ips[bits].sort()
last_ip = 0
for ip in ips[bits]:
if ip != last_ip and (ip ^ last_ip) == (1 << (32 - bits)):
ips[bits - 1].append(ip & (((1 << (bits - 1)) - 1) << (32 - (bits - 1))))
last_ip = 0
elif last_ip != 0:
cidrs.append((iplib.IPv4Address(last_ip), bits))
last_ip = ip
if last_ip != 0:
cidrs.append((iplib.IPv4Address(last_ip), bits))
nlh = nl_handle_alloc()
if nlh == None: nl_die("nl_handle_alloc")
if nl_connect(nlh, NETLINK_ROUTE) < 0: nl_die("nl_connect")
link_cache = rtnl_link_alloc_cache(nlh)
if link_cache == None: nl_die("rtnl_link_alloc")
iface = rtnl_link_name2i(link_cache, ORION_IFACE)
if iface < 0: nl_die("rtnl_link_name2i")
nl_cache_free(link_cache)
cidrs.sort(lambda (ip1, bits1), (ip2, bits2): cmp(ip1, ip2) if bits1 == bits2 else (bits1 - bits2))
tree = SubnetTree.SubnetTree()
for (ip, bits) in cidrs:
if str(ip) not in tree:
cidr = "%s/%s" % (ip, bits)
tree[cidr] = None
route = rtnl_route_alloc()
if route == None: nl_die("rtnl_route_alloc")
dstaddr = nl_addr_parse(cidr, AF_UNSPEC)
if dstaddr == None: nl_die("nl_addr_parse(%s)" % cidr)
if rtnl_route_set_dst(route, dstaddr) < 0: nl_die("rtnl_route_set_dst")
nl_addr_put(dstaddr)
srcaddr = nl_addr_parse(ORION_SRC, AF_UNSPEC)
if srcaddr == None: nl_die("nl_addr_parse(%s)" % ORION_SRC)
if rtnl_route_set_pref_src(route, srcaddr) < 0: nl_die("nl_route_set_pref_src")
nl_addr_put(srcaddr)
gwaddr = nl_addr_parse(ORION_GW, AF_UNSPEC)
if gwaddr == None: nl_die("nl_addr_parse(%s)" % ORION_GW)
if rtnl_route_set_gateway(route, gwaddr) < 0: nl_die("nl_route_set_gateway")
nl_addr_put(gwaddr)
rtnl_route_set_oif(route, iface)
rtnl_route_set_table(route, ORION_TABLE)
rtnl_route_set_scope(route, RT_SCOPE_UNIVERSE)
rtnl_route_set_protocol(route, RTPROT_STATIC)
rtnl_route_set_realms(route, ORION_REALMS)
if rtnl_route_add(nlh, route, NLM_F_REPLACE) < 0: nl_die("rtnl_route_add(dst=%s)" % cidr)
rtnl_route_put(route)
route_cache = rtnl_route_alloc_cache(nlh)
if route_cache == None: nl_die("rtnl_route_alloc_cache")
dstaddr_s = create_string_buffer(100)
route = nl_cache_get_first(route_cache)
while route != None:
table = rtnl_route_get_table(route)
if table != ORION_TABLE:
route = nl_cache_get_next(route)
continue
dstaddr = rtnl_route_get_dst(route)
if dstaddr == None:
continue
if nl_addr2str(dstaddr, dstaddr_s, sizeof(dstaddr_s)) == None: nl_die("nl_addr2str")
dstaddr = str(repr(dstaddr_s.value)).strip('\'').split('/')[0]
if dstaddr not in tree:
rtnl_route_del(nlh, route, 0)
route = nl_cache_get_next(route)
nl_cache_free(route_cache)
nl_handle_destroy(nlh)
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