File size: 4,727 Bytes
b2e2343 | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 | #!/usr/bin/python3.3 -O
from pyrser import grammar,meta
from pyrser.directives import ignore
from network import Host, Router
import sys
def insensitiveCase(s):
return "[" + " ".join("['" + "'|'".join(x) + "']" for x in map((lambda each: [each.lower(), each.upper()]), s)) + "]"
class MapParser(grammar.Grammar):
entry = "Map"
grammar = """
Map = [#init_map(_) @ignore("null") [[[Hosts:h #add_host(_, h)] | [Routers:r #add_router(_, r)]] eol*]+
#link_hosts(_) eof]
Hosts = [#init_host(_) '[' ws {host} ws ']' eol+ [[Name | Ip | TTL | Route]:r #add_fhost(_, r)]+]
Routers = [#init_router(_) '[' ws {router} ws ']' eol+ [[Name | Ip | TTL | Route]:r #add_frouter(_, r)]+]
Name = [ws {name} ws '=' ws id:i #ret_f(_, "id", i) ws eol+]
Ip = [ws {ip} ws '=' ws cidraddr:c #ret_f(_, "ip", c) ws eol+]
TTL = [ws {ttl} ws '=' ws num:n #ret_f(_, "ttl", n) ws eol+]
Route = [ws {route} ws '=' ws [[{default}:c ws id:i #ret_f(_, "route", c, i)]
| [cidraddr:c ws id:i #ret_f(_, "route", c, i)]] ws eol+]
cidraddr = [num '.' num '.' num '.' num '/' num]
ws = [[' ' | '\r' | '\t']*]
""".format(host = insensitiveCase("Host"),
router = insensitiveCase("Router"),
route = insensitiveCase("Route"),
ip = insensitiveCase("IP"),
ttl = insensitiveCase("TTL"),
name = insensitiveCase("Name"),
default = insensitiveCase("Default"),
internet = insensitiveCase("Internet"))
@meta.hook(MapParser)
def init_map(self, ast):
ast.network = {}
ast.routes = {}
return True
@meta.hook(MapParser)
def init_host(self, ast):
self.init_map(ast)
ast.network["route"] = []
return True
@meta.hook(MapParser)
def init_router(self, ast):
self.init_host(ast)
ast.network["ips"] = []
return True
@meta.hook(MapParser)
def link_hosts(self, ast):
for k,v in ast.routes.items():
for x in v:
if x[1] not in ast.network:
raise Exception("Unknown host ({0}) for {1} route.".format(x[1], k))
ast.network[k].addRoute(ast.network[x[1]], x[0])
return True
def base_add(ast, h):
if "name" not in h.network:
raise Exception("Missing name field for given host:\n{0}".format(self.value(h)))
if h.network["name"] in ast.network:
raise Exception("Redefinion of {0}.".format(h.network["name"]))
ast.routes[h.network["name"]] = h.network["route"][::]
@meta.hook(MapParser)
def add_host(self, ast, h):
base_add(ast, h)
if "ip" not in h.network:
raise Exception("Missing ip field for given host:\n{0}".format(self.value(h)))
if "ttl" in h.network:
ast.network[h.network["name"]] = Host(h.network["name"],
h.network["ip"], h.network["ttl"])
else:
ast.network[h.network["name"]] = Host(h.network["name"],
h.network["ip"])
return True
@meta.hook(MapParser)
def add_router(self, ast, h):
base_add(ast, h)
if not h.network["ips"]:
raise Exception("Missing ip field for given host")
if "ttl" in h.network:
ast.network[h.network["name"]] = Router(h.network["name"],
*h.network["ips"], ttl = h.network["ttl"])
else:
ast.network[h.network["name"]] = Router(h.network["name"],
*h.network["ips"])
return True
@meta.hook(MapParser)
def ret_f(self, ast, *args):
ast.retvals = [args[0]]
ast.retvals.extend([self.value(x) for x in args[1:]])
return True
@meta.hook(MapParser)
def add_fhost(self, ast, r):
def reg_name(ast, name):
ast.network["name"] = name[0]
def reg_ip(ast, ip):
ast.network["ip"] = ip[0]
def reg_ttl(ast, ttl):
ast.network["ttl"] = ttl[0]
def reg_route(ast, route):
ast.network["route"].append(route)
fmap = {'id' : reg_name,
'ip' : reg_ip,
'ttl' : reg_ttl,
'route' : reg_route}
if r.retvals[0] in fmap:
fmap[r.retvals[0]](ast, r.retvals[1:])
return True
@meta.hook(MapParser)
def add_frouter(self, ast, r):
def reg_name(ast, name):
ast.network["name"] = name[0]
def reg_ip(ast, ip):
ast.network["ips"].append(ip[0])
def reg_ttl(ast, ttl):
ast.network["ttl"] = ttl[0]
def reg_route(ast, route):
ast.network["route"].append(route)
fmap = {'id' : reg_name,
'ip' : reg_ip,
'ttl' : reg_ttl,
'route' : reg_route}
if r.retvals[0] in fmap:
fmap[r.retvals[0]](ast, r.retvals[1:])
return True
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