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Extend confluent PXE support

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For relay agent options, preserve and echo back the option,
needed for certain environments.

Also, it turns out that for whatever reason on some platforms, iPXE's
proxyDHCP logic can't seem to get a reply.  In this scenario,
provide the filename in the DHCP offer without waiting for proxyDHCP.

This change may be worth evaluating more broadly, but may carry risk of not working
right with unmanaged DHCP servers.
This commit is contained in:
Jarrod Johnson 2024-02-01 16:38:04 -05:00
parent 7377c44e0f
commit a17695ad06
1 changed files with 15 additions and 0 deletions
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15
confluent_server/confluent/discovery/protocols/pxe.py
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@ -771,6 +771,14 @@ def reply_dhcp4(node, info, packet, cfg, reqview, httpboot, cfd, profile):
node, profile, len(bootfile) - 127)})
return
repview[108:108 + len(bootfile)] = bootfile
elif info['architecture'] == 'uefi-aarch64' and packet.get(77, None) == b'iPXE':
if not profile:
profile = get_deployment_profile(node, cfg)
if not profile:
log.log({'info': 'No pending profile for {0}, skipping proxyDHCP eply'.format(node)})
return
bootfile = 'http://{0}/confluent-public/os/{1}/boot.ipxe'.format(myipn, profile).encode('utf8')
repview[108:108 + len(bootfile)] = bootfile
myip = myipn
myipn = socket.inet_aton(myipn)
orepview[12:16] = myipn
@ -812,6 +820,13 @@ def reply_dhcp4(node, info, packet, cfg, reqview, httpboot, cfd, profile):
repview[replen - 1:replen + 1] = b'\x03\x04'
repview[replen + 1:replen + 5] = gateway
replen += 6
if 82 in packet:
reloptionslen = len(packet[82])
reloptionshdr = struct.pack('BB', 82, reloptionslen)
repview[replen - 1:replen + 1] = reloptionshdr
repview[replen + 1:replen + reloptionslen + 1] = packet[82]
replen += 2 + reloptionslen
repview[replen - 1:replen] = b'\xff' # end of options, should always be last byte
repview = memoryview(reply)
pktlen = struct.pack('!H', replen + 28) # ip+udp = 28