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Add option 97 (UUID) to OFFER

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Per PXE specification, this is among the required fields.
This commit is contained in:
Jarrod Johnson 2020-03-20 17:23:33 -04:00
parent 20a26e6fdb
commit 1c7c897267
1 changed files with 8 additions and 8 deletions
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16
confluent_server/confluent/discovery/protocols/pxe.py
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@ -374,17 +374,18 @@ def check_reply(node, info, packet, sock, cfg, reqview):
repview[242] = 2
elif rqtype == 3: # if request, then ack
repview[242] = 5
repview[243:245] = b'\x36\x04' # DHCP service identifier
repview[243:245] = b'\x36\x04' # DHCP server identifier
repview[245:249] = myipn
repview[249:255] = b'\x33\x04\x00\x00\x00\xf0'
repview[255] = 0xff # end of options, should always be last byte
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 = memoryview(reply)
pktlen = struct.pack('!H', 256 + 28) # ip+udp = 28
pktlen = struct.pack('!H', 275 + 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', 256 + 8)
sumdata = repview[28:]
repview[24:26] = struct.pack('!H', 275 + 8)
datasum = _ipsum(bytes(repview[12:]) + b'\x00\x11' + bytes(
repview[24:26]))
datasum = ~datasum & 0xffff
@ -400,8 +401,7 @@ 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, 284, 0, ctypes.byref(targ),
sendto(tsock.fileno(), pkt, 275 + 28, 0, ctypes.byref(targ),
ctypes.sizeof(targ))
print('Thinking about reply to {0}'.format(node))