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Setting PXEClient in option 60

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This trigges the proxyDHCP sequence to follow up.
This commit is contained in:
Jarrod Johnson 2020-03-20 17:40:29 -04:00
parent 1c7c897267
commit 895216d94f
1 changed files with 5 additions and 4 deletions
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9
confluent_server/confluent/discovery/protocols/pxe.py
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@ -379,13 +379,14 @@ def check_reply(node, info, packet, sock, cfg, reqview):
repview[249:255] = b'\x33\x04\x00\x00\x00\xf0' # fixed short lease time
repview[255:257] = b'\x61\x11'
repview[257:274] = packet[97]
repview[274] = 0xff # end of options, should always be last byte
repview[274:285] = b'\x3c\x09PXEClient'
repview[285] = 0xff # end of options, should always be last byte
repview = memoryview(reply)
pktlen = struct.pack('!H', 275 + 28) # ip+udp = 28
pktlen = struct.pack('!H', 286 + 28) # ip+udp = 28
repview[2:4] = pktlen
curripsum = ~(_ipsum(constiphdrsum + pktlen + myipn)) & 0xffff
repview[10:12] = struct.pack('!H', curripsum)
repview[24:26] = struct.pack('!H', 275 + 8)
repview[24:26] = struct.pack('!H', 286 + 8)
datasum = _ipsum(bytes(repview[12:]) + b'\x00\x11' + bytes(
repview[24:26]))
datasum = ~datasum & 0xffff
@ -401,7 +402,7 @@ def check_reply(node, info, packet, sock, cfg, reqview):
targ.sll_protocol = socket.htons(0x800)
targ.sll_ifindex = info['netinfo']['ifidx']
pkt = ctypes.byref((ctypes.c_char * 284).from_buffer(repview))
sendto(tsock.fileno(), pkt, 275 + 28, 0, ctypes.byref(targ),
sendto(tsock.fileno(), pkt, 286 + 28, 0, ctypes.byref(targ),
ctypes.sizeof(targ))
print('Thinking about reply to {0}'.format(node))