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ios15 修复websocket ssl连接失败的问题

发表于 分类于 Disqus：

玩家反馈，ios15无法登录游戏，android和ios其他版本没有问题

分析发现，ios15将原本是一条数据内容分成三份发送

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## 本来这应该是一条数据的
## FIN - Payload len
websocket:request:53 [mfa:proc_lib:init_p/5] parse_frames:{ssl,hybi,<<130,131>>,{ssl,{sslsocket,{gen_tcp,#Port<0.17851>,tls_connection,<0.533.0>},<0.6628.124>}}}
## Masking-key
websocket:request:53 [mfa:proc_lib:init_p/5] parse_frames:{ssl,hybi,<<153,193,1,85>>,{ssl,{sslsocket,{gen_tcp,#Port<0.17851>,tls_connection,<0.533.0>},<0.6628.124>}}}
## Payload Data
websocket:request:53 [mfa:proc_lib:init_p/5] parse_frames:{ssl,hybi,<<190,209,15>>,{ssl,{sslsocket,{gen_tcp,#Port<0.17851>,tls_connection,<0.533.0>},<0.6628.124>}}}

对应的协议格式：

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 0                   1                   2                   3
 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-------+-+-------------+-------------------------------+
|F|R|R|R| opcode|M| Payload len |    Extended payload length    |
|I|S|S|S|  (4)  |A|     (7)     |             (16/63)           |
|N|V|V|V|       |S|             |   (if payload len==126/127)   |
| |1|2|3|       |K|             |                               |
+-+-+-+-+-------+-+-------------+ - - - - - - - - - - - - - - - +
|     Extended payload length continued, if payload len == 127  |
+ - - - - - - - - - - - - - - - +-------------------------------+
|                               |Masking-key, if MASK set to 1  |
+-------------------------------+-------------------------------+
| Masking-key (continued)       |          Payload Data         |
+-------------------------------- - - - - - - - - - - - - - - - +
:                     Payload Data continued ...                :
+ - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - +
|                     Payload Data continued ...                |
+---------------------------------------------------------------+

对于使用mochiweb的websocket只要增加

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parse_hybi_frames(_, <<>>, Acc) ->
    lists:reverse(Acc);

......此处省略N行

%% 数据不完整，继续收
parse_hybi_frames(Socket, PartFrame, Acc) ->
    %%  io:format("3 ~p ~n",[{_Fin,_Rsv,_Opcode,_Mask,_PayloadLen,_MaskKey}]),
    ok = mochiweb_socket:exit_if_closed(mochiweb_socket:setopts(Socket, [{packet, 0}, {active, once}])),
    receive
        {tcp_closed, _} ->
            mochiweb_socket:close(Socket),
            exit(normal);
        {ssl_closed, _} ->
            mochiweb_socket:close(Socket),
            exit(normal);
        {tcp_error, _, _} ->
            mochiweb_socket:close(Socket),
            exit(normal);
        {Proto, _, Continuation} when Proto =:= tcp orelse Proto =:= ssl ->
            parse_hybi_frames(Socket, <<PartFrame/binary, Continuation/binary>>,
                Acc);
        _ ->
            mochiweb_socket:close(Socket),
            exit(normal)
    after
        5000 ->
            mochiweb_socket:close(Socket),
            exit(normal)
    end.

其他语言也差不多的逻辑，数据不全就继续等待数据了

参考文档

  1. https://datatracker.ietf.org/doc/html/draft-ietf-hybi-thewebsocketprotocol-10