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Forum Discussion

Matthew_Gamble_'s avatar
Matthew_Gamble_
Icon for Nimbostratus rankNimbostratus
Mar 12, 2009

TFTP Server?

Is it possible to write a simple TFTP server as an iRule to return static content? I see some examples for load balancing TFTP requests, but not for actually acting as a TFTP server. I have a very s...
application delivery
dev
devops
iRules
Nat_Thirasuttakorn's avatar
Nat_Thirasuttakorn
Icon for Employee rankEmployee
Mar 13, 2009
I got a chance to test ...here is my irule 


when CLIENT_ACCEPTED {
set blockdata(1) [binary format H* 000300014620494e495452442e494d473b31\
202020202020202020202020202020202020202020202020202020202020202020202020\
202020202020202020202020202020202020202020202020202020202020202020202020\
202020202020202020202020202020202020202020202020202020202020202020202020\
202020202020202020202020202020202020202020202020202020202020202020202020\
202020202020202020202020202020202020202020202020202020202020202020202020\
2020202020202020202020202020202009696e697472642e696d670d0a4620524541444d\
452e3b312020202020202020202020202020202020202020202020202020202020202020\
202020202020202020202020202020202020202020202020202020202020202020202020\
202020202020202020202020202020202020202020202020202020202020202020202020\
202020202020202020202020202020202020202020202020202020202020202020202020\
202020202020202020202020202020202020202020202020202020202020202020202020\
202020202020202020202020202020202020202020202009524541444d450d0a4620564d\
4c494e555a2e3b3120202020202020202020202020202020202020202020202020202020\
202020202020202020202020202020202020202020202020202020202020]
set blockdata(2) [binary format H* 000300022020202020202020202020202020\
202020202020202020202020202020202020202020202020202020202020202020202020\
202020202020202020202020202020202020202020202020202020202020202020202020\
202020202020202020202020202020202020202020202020202020202020202020202020\
20202020202020202020202020202020202009766d6c696e757a0d0a]
node [IP::client_addr] [TCP::client_port]
snat [IP::local_addr]
}
when CLIENT_DATA {
UDP::payload replace 0 [UDP::payload length] $blockdata(1)
}
when SERVER_DATA {
binary scan [UDP::payload] I tmp
set opcode [expr $tmp >> 16]
set blockid [expr $tmp & 0xffff]
if { $blockid < [array size blockdata] } {
UDP::respond $blockdata([expr $blockid + 1])
}
UDP::drop
}

it works when I connect from linux tftp client... right, this irule is not complete. I see that citizen_elah and jquinby already started a good one. so this can be merge with irule in previous post. For example, no filename checking and no type checking, so this irule will always return same data no matter what filename/mode client ask for.