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authorMichael Santos <[email protected]>2016-02-12 10:59:36 -0500
committerMichael Santos <[email protected]>2016-02-12 11:09:22 -0500
commitdda67a46e848196fc8603e696a1e2dd55b69e75b (patch)
tree45b151cd5736471e1a96a23f5515e1ab779e6166 /lib/inets/src
parent439292ad4afe73243852fe79d5d467c325f382bf (diff)
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tftp: support transfer of files > 65535 blocks
The block count is an unsigned 2 byte integer. The common behaviour of tftp clients and servers is to overflow the block count and wrap the counter to 0 in order to support files larger than 32M. Modify the tftp implementation to do the same rollover. Interoperability was tested by transferring a 1.4G file using the HPA tftp client.
Diffstat (limited to 'lib/inets/src')
-rw-r--r--lib/inets/src/tftp/tftp_engine.erl36
1 files changed, 7 insertions, 29 deletions
diff --git a/lib/inets/src/tftp/tftp_engine.erl b/lib/inets/src/tftp/tftp_engine.erl
index 8d282a1e9d..493a29a68f 100644
--- a/lib/inets/src/tftp/tftp_engine.erl
+++ b/lib/inets/src/tftp/tftp_engine.erl
@@ -656,22 +656,11 @@ common_read(Config, Callback, Req, _LocalAccess, ExpectedBlockNo, ActualBlockNo,
do_common_read(Config, Callback, Req, LocalAccess, BlockNo, Data, Prepared)
when is_binary(Data), is_record(Prepared, prepared) ->
- NextBlockNo = BlockNo + 1,
- case NextBlockNo =< 65535 of
- true ->
- Reply = #tftp_msg_data{block_no = NextBlockNo, data = Data},
- {Config2, Callback2, TransferRes} =
- transfer(Config, Callback, Req, Reply, LocalAccess, NextBlockNo, Prepared),
- ?MODULE:common_loop(Config2, Callback2, Req, TransferRes, LocalAccess, NextBlockNo);
- false ->
- Code = badblk,
- Text = "Too big transfer ID = " ++
- integer_to_list(NextBlockNo) ++ " > 65535",
- {undefined, Error} =
- callback({abort, {Code, Text}}, Config, Callback, Req),
- send_msg(Config, Req, Error),
- terminate(Config, Req, ?ERROR(read, Code, Text, Req#tftp_msg_req.filename))
- end.
+ NextBlockNo = (BlockNo + 1) rem 65536,
+ Reply = #tftp_msg_data{block_no = NextBlockNo, data = Data},
+ {Config2, Callback2, TransferRes} =
+ transfer(Config, Callback, Req, Reply, LocalAccess, NextBlockNo, Prepared),
+ ?MODULE:common_loop(Config2, Callback2, Req, TransferRes, LocalAccess, NextBlockNo).
-spec common_write(#config{}, #callback{}, _, 'write', integer(), integer(), _, #prepared{}) -> no_return().
@@ -715,21 +704,10 @@ common_write(Config, Callback, Req, _, ExpectedBlockNo, ActualBlockNo, Data, Pre
common_ack(Config, Callback, Req, LocalAccess, BlockNo, Prepared)
when is_record(Prepared, prepared) ->
Reply = #tftp_msg_ack{block_no = BlockNo},
- NextBlockNo = BlockNo + 1,
+ NextBlockNo = (BlockNo + 1) rem 65536,
{Config2, Callback2, TransferRes} =
transfer(Config, Callback, Req, Reply, LocalAccess, NextBlockNo, Prepared),
- case NextBlockNo =< 65535 of
- true ->
- ?MODULE:common_loop(Config2, Callback2, Req, TransferRes, LocalAccess, NextBlockNo);
- false ->
- Code = badblk,
- Text = "Too big transfer ID = " ++
- integer_to_list(NextBlockNo) ++ " > 65535",
- {undefined, Error} =
- callback({abort, {Code, Text}}, Config, Callback2, Req),
- send_msg(Config, Req, Error),
- terminate(Config, Req, ?ERROR(read, Code, Text, Req#tftp_msg_req.filename))
- end.
+ ?MODULE:common_loop(Config2, Callback2, Req, TransferRes, LocalAccess, NextBlockNo).
pre_terminate(Config, Req, Result) ->
if