mirror of
https://github.com/processone/ejabberd.git
synced 2024-12-22 17:28:25 +01:00
185 lines
5.4 KiB
Erlang
185 lines
5.4 KiB
Erlang
%%%----------------------------------------------------------------------
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%%% File : ejabberd_http.erl
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%%% Author : Paweł Chmielowski <pawel@process-one.net>
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%%% Purpose :
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%%% Created : 27 Nov 2018 by Paweł Chmielowski <pawel@process-one.net>
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%%%
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%%%
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%%% ejabberd, Copyright (C) 2002-2021 ProcessOne
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%%%
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%%% This program is free software; you can redistribute it and/or
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%%% modify it under the terms of the GNU General Public License as
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%%% published by the Free Software Foundation; either version 2 of the
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%%% License, or (at your option) any later version.
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%%%
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%%% This program is distributed in the hope that it will be useful,
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%%% but WITHOUT ANY WARRANTY; without even the implied warranty of
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%%% MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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%%% General Public License for more details.
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%%%
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%%% You should have received a copy of the GNU General Public License along
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%%% with this program; if not, write to the Free Software Foundation, Inc.,
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%%% 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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%%%
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%%%----------------------------------------------------------------------
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-module(proxy_protocol).
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-author("pawel@process-one.net").
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%% API
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-export([decode/3]).
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decode(SockMod, Socket, Timeout) ->
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V = SockMod:recv(Socket, 6, Timeout),
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case V of
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{ok, <<"PROXY ">>} ->
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decode_v1(SockMod, Socket, Timeout);
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{ok, <<16#0d, 16#0a, 16#0d, 16#0a, 16#00, 16#0d>>} ->
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decode_v2(SockMod, Socket, Timeout);
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_ ->
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{error, eproto}
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end.
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decode_v1(SockMod, Socket, Timeout) ->
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case read_until_rn(SockMod, Socket, <<>>, false, Timeout) of
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{error, _} = Err ->
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Err;
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Val ->
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case binary:split(Val, <<" ">>, [global]) of
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[<<"TCP4">>, SAddr, DAddr, SPort, DPort] ->
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try {inet_parse:ipv4strict_address(binary_to_list(SAddr)),
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inet_parse:ipv4strict_address(binary_to_list(DAddr)),
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binary_to_integer(SPort),
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binary_to_integer(DPort)}
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of
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{{ok, DA}, {ok, SA}, DP, SP} ->
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{{SA, SP}, {DA, DP}};
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_ ->
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{error, eproto}
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catch
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error:badarg ->
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{error, eproto}
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end;
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[<<"TCP6">>, SAddr, DAddr, SPort, DPort] ->
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try {inet_parse:ipv6strict_address(binary_to_list(SAddr)),
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inet_parse:ipv6strict_address(binary_to_list(DAddr)),
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binary_to_integer(SPort),
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binary_to_integer(DPort)}
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of
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{{ok, DA}, {ok, SA}, DP, SP} ->
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{{SA, SP}, {DA, DP}};
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_ ->
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{error, eproto}
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catch
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error:badarg ->
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{error, eproto}
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end;
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[<<"UNKNOWN">> | _] ->
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{undefined, undefined}
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end
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end.
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decode_v2(SockMod, Socket, Timeout) ->
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case SockMod:recv(Socket, 10, Timeout) of
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{error, _} = Err ->
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Err;
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{ok, <<16#0a, 16#51, 16#55, 16#49, 16#54, 16#0a,
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2:4, Command:4, Transport:8, AddrLen:16/big-unsigned-integer>>} ->
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case SockMod:recv(Socket, AddrLen, Timeout) of
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{error, _} = Err ->
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Err;
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{ok, Data} ->
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case Command of
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0 ->
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case {inet:sockname(Socket), inet:peername(Socket)} of
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{{ok, SA}, {ok, DA}} ->
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{SA, DA};
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{{error, _} = E, _} ->
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E;
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{_, {error, _} = E} ->
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E
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end;
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1 ->
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case Transport of
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% UNSPEC or UNIX
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V when V == 0; V == 16#31; V == 16#32 ->
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{{unknown, unknown}, {unknown, unknown}};
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% IPV4 over TCP or UDP
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V when V == 16#11; V == 16#12 ->
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case Data of
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<<D1:8, D2:8, D3:8, D4:8,
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S1:8, S2:8, S3:8, S4:8,
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DP:16/big-unsigned-integer,
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SP:16/big-unsigned-integer,
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_/binary>> ->
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{{{S1, S2, S3, S4}, SP},
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{{D1, D2, D3, D4}, DP}};
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_ ->
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{error, eproto}
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end;
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% IPV6 over TCP or UDP
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V when V == 16#21; V == 16#22 ->
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case Data of
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<<D1:16/big-unsigned-integer,
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D2:16/big-unsigned-integer,
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D3:16/big-unsigned-integer,
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D4:16/big-unsigned-integer,
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D5:16/big-unsigned-integer,
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D6:16/big-unsigned-integer,
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D7:16/big-unsigned-integer,
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D8:16/big-unsigned-integer,
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S1:16/big-unsigned-integer,
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S2:16/big-unsigned-integer,
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S3:16/big-unsigned-integer,
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S4:16/big-unsigned-integer,
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S5:16/big-unsigned-integer,
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S6:16/big-unsigned-integer,
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S7:16/big-unsigned-integer,
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S8:16/big-unsigned-integer,
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DP:16/big-unsigned-integer,
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SP:16/big-unsigned-integer,
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_/binary>> ->
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{{{S1, S2, S3, S4, S5, S6, S7, S8}, SP},
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{{D1, D2, D3, D4, D5, D6, D7, D8}, DP}};
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_ ->
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{error, eproto}
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end
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end;
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_ ->
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{error, eproto}
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end
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end;
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<<16#0a, 16#51, 16#55, 16#49, 16#54, 16#0a, _/binary>> ->
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{error, eproto};
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_ ->
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{error, eproto}
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end.
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read_until_rn(_SockMod, _Socket, Data, _, _) when size(Data) > 107 ->
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{error, eproto};
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read_until_rn(SockMod, Socket, Data, true, Timeout) ->
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case SockMod:recv(Socket, 1, Timeout) of
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{ok, <<"\n">>} ->
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Data;
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{ok, <<"\r">>} ->
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read_until_rn(SockMod, Socket, <<Data/binary, "\r">>,
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true, Timeout);
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{ok, Other} ->
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read_until_rn(SockMod, Socket, <<Data/binary, "\r", Other/binary>>,
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false, Timeout);
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{error, _} = Err ->
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Err
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end;
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read_until_rn(SockMod, Socket, Data, false, Timeout) ->
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case SockMod:recv(Socket, 2, Timeout) of
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{ok, <<"\r\n">>} ->
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Data;
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{ok, <<Byte:8, "\r">>} ->
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read_until_rn(SockMod, Socket, <<Data/binary, Byte:8>>,
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true, Timeout);
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{ok, Other} ->
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read_until_rn(SockMod, Socket, <<Data/binary, Other/binary>>,
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false, Timeout);
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{error, _} = Err ->
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Err
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end.
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