PurpleI2P/pyseeder
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calculate identity size from certificate. Recognize yggdrasil

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orignal 2025-02-05 21:23:53 -05:00
parent 1c1ca86a7b
commit ce391cb92c
1 changed files with 27 additions and 5 deletions
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32
pyseeder/routerinfo.py
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@ -1,11 +1,14 @@
class RouterInfo:
def __init__(self, filename):
self.yggdrasil = False
with open(filename, 'rb') as f:
buf = f.read()
if len(buf) < 391: # TODO: parse identity
if len(buf) < 387:
return
offset = 391
offset = 384 # crypto and signing keys
offset += int.from_bytes(buf[offset + 1: offset + 3], byteorder='big') # size from certificate
offset += 3 # certificate
self.timestamp = int.from_bytes(buf[offset: offset + 8], byteorder='big') # 8 bytes timestamp
offset += 8
offset += self.readaddresses(buf[offset:]) # addresses
@ -19,9 +22,25 @@ class RouterInfo:
for i in range(0, numaddresses):
offset += 1 # cost
offset += 8 # date
offset += len(self.readstring(buf[offset:])) + 1 # style string
size = int.from_bytes(buf[offset:offset+2], byteorder='big') # properties
offset += size + 2
style = self.readstring(buf[offset:]) # transport style
offset += len(style) + 1 # style string
size = int.from_bytes(buf[offset:offset+2], byteorder='big') # size of properties
offset += 2
if not self.yggdrasil and style == 'NTCP2': # possible yggdrasil?
r = offset
while r < size + offset:
key = self.readstring(buf[r:])
r += len(key) + 2 # length and =
if key == 'host':
value = self.readstring(buf[r:])
firstcolon = value.find(':')
if firstcolon > 0: # ipv6 address
first = int(value[0:firstcolon], 16) # first segment of ipv6 address
if first >= 0x0200 and first <= 0x03FF: # yggdrasil range
self.yggdrasil = True
break
r += len(self.readstring(buf[r:])) + 2 # length and ;
offset += size
return offset
def readproperties(self, buf):
@ -57,3 +76,6 @@ class RouterInfo:
def isvalid(self):
return self.getversion() >= 959 and not self.hasinvalidcaps() # version >= 0.9.59 and no 'U', 'D', 'E' or 'G' caps
def isyggdrasil(self):
return self.yggdrasil