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authorHans Nilsson <[email protected]>2019-04-24 14:51:36 +0200
committerHans Nilsson <[email protected]>2019-04-24 14:51:36 +0200
commit62f78b258e83871458ccd3599dbbcc5585ca4104 (patch)
tree389f8ff9df8a8a5bbccdb5896eb297b0e0a7e918 /lib/ssh
parent3694a010d2c5ec63f97405519f4b728eea1f902b (diff)
parent167892981042f4a5eb4ac76a1e5a532d5ce65b65 (diff)
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Merge branch 'hans/ssh/hex_dump_info/OTP-15772' into maint
* hans/ssh/hex_dump_info/OTP-15772: ssh: Dump 64 bytes in case of unexpected info line ssh: Add hexdump utility in ssh_dbg
Diffstat (limited to 'lib/ssh')
-rw-r--r--lib/ssh/src/ssh_connection_handler.erl8
-rw-r--r--lib/ssh/src/ssh_dbg.erl73
2 files changed, 77 insertions, 4 deletions
diff --git a/lib/ssh/src/ssh_connection_handler.erl b/lib/ssh/src/ssh_connection_handler.erl
index 7c87591cf2..8f32966a12 100644
--- a/lib/ssh/src/ssh_connection_handler.erl
+++ b/lib/ssh/src/ssh_connection_handler.erl
@@ -594,7 +594,7 @@ handle_event(_, socket_control, {hello,_}=StateName, D) ->
{stop, {shutdown,{unexpected_getopts_return, Other}}}
end;
-handle_event(_, {info_line,_Line}, {hello,Role}=StateName, D) ->
+handle_event(_, {info_line,Line}, {hello,Role}=StateName, D) ->
case Role of
client ->
%% The server may send info lines to the client before the version_exchange
@@ -605,9 +605,9 @@ handle_event(_, {info_line,_Line}, {hello,Role}=StateName, D) ->
%% But the client may NOT send them to the server. Openssh answers with cleartext,
%% and so do we
send_bytes("Protocol mismatch.", D),
- ?call_disconnectfun_and_log_cond("Protocol mismatch.",
- "Protocol mismatch in version exchange. Client sent info lines.",
- StateName, D),
+ Msg = io_lib:format("Protocol mismatch in version exchange. Client sent info lines.~n~s",
+ [ssh_dbg:hex_dump(Line, 64)]),
+ ?call_disconnectfun_and_log_cond("Protocol mismatch.", Msg, StateName, D),
{stop, {shutdown,"Protocol mismatch in version exchange. Client sent info lines."}}
end;
diff --git a/lib/ssh/src/ssh_dbg.erl b/lib/ssh/src/ssh_dbg.erl
index 4fe15b24d3..43ac4c0ccf 100644
--- a/lib/ssh/src/ssh_dbg.erl
+++ b/lib/ssh/src/ssh_dbg.erl
@@ -60,6 +60,7 @@
cbuf_stop_clear/0,
cbuf_in/1,
cbuf_list/0,
+ hex_dump/1, hex_dump/2,
fmt_cbuf_items/0, fmt_cbuf_item/1
]).
@@ -439,3 +440,75 @@ fmt_value(#circ_buf_entry{module = M,
io_lib:format("~p:~p ~p/~p ~p~n~s",[M,L,F,A,Pid,fmt_value(V)]);
fmt_value(Value) ->
io_lib:format("~p",[Value]).
+
+%%%================================================================
+
+-record(h, {max_bytes = 65536,
+ bytes_per_line = 16,
+ address_len = 4
+ }).
+
+
+hex_dump(Data) -> hex_dump1(Data, hd_opts([])).
+
+hex_dump(X, Max) when is_integer(Max) ->
+ hex_dump(X, [{max_bytes,Max}]);
+hex_dump(X, OptList) when is_list(OptList) ->
+ hex_dump1(X, hd_opts(OptList)).
+
+hex_dump1(B, Opts) when is_binary(B) -> hex_dump1(binary_to_list(B), Opts);
+hex_dump1(L, Opts) when is_list(L), length(L) > Opts#h.max_bytes ->
+ io_lib:format("~s---- skip ~w bytes----~n", [hex_dump1(lists:sublist(L,Opts#h.max_bytes), Opts),
+ length(L) - Opts#h.max_bytes
+ ]);
+hex_dump1(L, Opts0) when is_list(L) ->
+ Opts = Opts0#h{address_len = num_hex_digits(Opts0#h.max_bytes)},
+ Result = hex_dump(L, [{0,[],[]}], Opts),
+ [io_lib:format("~*.s | ~*s | ~s~n"
+ "~*.c-+-~*c-+-~*c~n",
+ [Opts#h.address_len, lists:sublist("Address",Opts#h.address_len),
+ -3*Opts#h.bytes_per_line, lists:sublist("Hexdump",3*Opts#h.bytes_per_line),
+ "ASCII",
+ Opts#h.address_len, $-,
+ 3*Opts#h.bytes_per_line, $-,
+ Opts#h.bytes_per_line, $-
+ ]) |
+ [io_lib:format("~*.16.0b | ~s~*c | ~s~n",[Opts#h.address_len, N*Opts#h.bytes_per_line,
+ lists:reverse(Hexs),
+ 3*(Opts#h.bytes_per_line-length(Hexs)), $ ,
+ lists:reverse(Chars)])
+ || {N,Hexs,Chars} <- lists:reverse(Result)
+ ]
+ ].
+
+
+hd_opts(L) -> lists:foldl(fun hd_opt/2, #h{}, L).
+
+hd_opt({max_bytes,M}, O) -> O#h{max_bytes=M};
+hd_opt({bytes_per_line,M}, O) -> O#h{bytes_per_line=M}.
+
+
+num_hex_digits(N) when N<16 -> 1;
+num_hex_digits(N) -> trunc(math:ceil(math:log2(N)/4)).
+
+
+hex_dump([L|Cs], Result0, Opts) when is_list(L) ->
+ Result = hex_dump(L,Result0, Opts),
+ hex_dump(Cs, Result, Opts);
+
+hex_dump(Cs, [{N0,_,Chars}|_]=Lines, Opts) when length(Chars) == Opts#h.bytes_per_line ->
+ hex_dump(Cs, [{N0+1,[],[]}|Lines], Opts);
+
+hex_dump([C|Cs], [{N,Hexs,Chars}|Lines], Opts) ->
+ Asc = if
+ 16#20 =< C,C =< 16#7E -> C;
+ true -> $.
+ end,
+ Hex = io_lib:format("~2.16.0b ", [C]),
+ hex_dump(Cs, [{N, [Hex|Hexs], [Asc|Chars]} | Lines], Opts);
+
+hex_dump([], Result, _) ->
+ Result.
+
+
+