File 4472-Rewrite-input_handler-loop.patch of Package erlang

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File 4472-Rewrite-input_handler-loop.patch of Package erlang (Revision 0b3a6d6e89afeaba4dcdf8fb3d620103)

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From 5ab182d7f15942f0e0e65f92e2cd88d4fa9ab1f8 Mon Sep 17 00:00:00 2001
From: Raimo Niskanen <raimo@erlang.org>
Date: Thu, 20 Oct 2022 15:47:40 +0200
Subject: [PATCH 22/27] Rewrite input_handler loop

---
 lib/ssl/test/inet_crypto_dist.erl | 175 ++++++++++++++++++------------
 1 file changed, 103 insertions(+), 72 deletions(-)

diff --git a/lib/ssl/test/inet_crypto_dist.erl b/lib/ssl/test/inet_crypto_dist.erl
index 217eff661e..9e461ac185 100644
--- a/lib/ssl/test/inet_crypto_dist.erl
+++ b/lib/ssl/test/inet_crypto_dist.erl
@@ -971,7 +971,12 @@ init_recv(
                  RecvParams_1#params{iv = {IV2BSalt, IV2BNo}}}
         end
     catch
-        error : Reason : Stacktrace->
+        Class : Reason : Stacktrace when Class =:= error ->
+            error_logger:info_report(
+              [init_recv_exception,
+               {class, Class},
+               {reason, Reason},
+               {stacktrace, Stacktrace}]),
             _ = trace({Reason, Stacktrace}),
             exit(connection_closed)
     end.
@@ -1113,7 +1118,7 @@ handshake(
                                         input_handler(
                                           RecvParams#params{
                                             dist_handle = DistHandle},
-                                          RecvSeq, empty_q())
+                                          RecvSeq)
                                     catch
                                         Class : Reason : Stacktrace ->
                                             error_logger:info_report(
@@ -1198,11 +1203,17 @@ recv_and_decrypt_chunk(#params{socket = Socket} = RecvParams, RecvSeq) ->
             case decrypt_chunk(RecvParams, RecvSeq, Chunk) of
                 <<?HANDSHAKE_CHUNK, Cleartext/binary>> ->
                     {RecvParams, RecvSeq + 1, {ok, Cleartext}};
-                OtherChunk when is_binary(OtherChunk) ->
-                    {RecvParams, RecvSeq + 1, {error, decrypt_error}};
+                UnknownChunk when is_binary(UnknownChunk) ->
+                    error_logger:error_report(
+                      [?FUNCTION_NAME,
+                       {reason,unknown_chunk}]),
+                    {RecvParams, RecvSeq + 1, {error, unknown_chunk}};
                 #params{} = RecvParams_1 ->
                     recv_and_decrypt_chunk(RecvParams_1, 0);
                 error ->
+                    error_logger:error_report(
+                      [?FUNCTION_NAME,
+                       {reason,decrypt_error}]),
                     {RecvParams, RecvSeq, {error, decrypt_error}}
             end;
         Error ->
@@ -1352,98 +1363,121 @@ output_handler_xfer(Params, Seq, Front, Size, Rear) ->
 %% Input handler process
 %%
 
-input_handler(#params{socket = Socket} = Params, Seq, Q) ->
+input_handler(Params, Seq) ->
+    input_handler(Params, Seq, [], 0, []).
+%%
+input_handler(#params{socket = Socket} = Params, Seq, Front, Size, Rear) ->
     receive
         Msg ->
             case Msg of
                 {tcp_passive, Socket} ->
                     ok = inet:setopts(Socket, [{active, ?TCP_ACTIVE}]),
-                    input_handler(Params, Seq, Q);
+                    input_handler(Params, Seq, Front, Size, Rear);
                 {tcp, Socket, Chunk} ->
-                    input_chunk(Params, Seq, Q, Chunk);
+                    input_chunk(Params, Seq, Front, Size, Rear, Chunk);
                 {tcp_closed, Socket} ->
+                    error_logger:info_report(
+                      [?FUNCTION_NAME,
+                       {reason, tcp_closed}]),
                     exit(connection_closed);
                 Other ->
                     %% Ignore...
                     _ = trace(Other),
-                    input_handler(Params, Seq, Q)
+                    input_handler(Params, Seq, Front, Size, Rear)
             end
     end.
 
-input_chunk(Params, Seq, Q, Chunk) ->
+input_chunk(Params, Seq, Front, Size, Rear, Chunk) ->
     case decrypt_chunk(Params, Seq, Chunk) of
         <<?DATA_CHUNK, Cleartext/binary>> ->
-            Q_1 = enq_binary(Cleartext, Q),
-            Q_2 = deliver_data(Params#params.dist_handle, Q_1),
-            input_handler(Params, Seq + 1, Q_2);
+            input_deliver(
+              Params, Seq + 1, Front,
+              Size + byte_size(Cleartext), [Cleartext|Rear]);
         <<?TICK_CHUNK, _/binary>> ->
-            input_handler(Params, Seq + 1, Q);
-        OtherChunk when is_binary(OtherChunk) ->
+            input_handler(Params, Seq + 1, Front, Size, Rear);
+        UnknownChunk when is_binary(UnknownChunk) ->
+            error_logger:error_report(
+              [?FUNCTION_NAME,
+               {reason, unknown_chunk}]),
             _ = trace(invalid_chunk),
             exit(connection_closed);
         #params{} = Params_1 ->
-            input_handler(Params_1, 0, Q);
+            input_handler(Params_1, 0, Front, Size, Rear);
         error ->
             _ = trace(decrypt_error),
             exit(connection_closed)
     end.
 
-%% -------------------------------------------------------------------------
-%% erlang:dist_ctrl_* helpers
-
-%% De-packet and deliver received data to the VM from a queue
-%%
-deliver_data(DistHandle, Q) ->
-    case Q of
-        {[], Size, []} ->
-            Size = 0, % Assert
-            Q;
-        {[], Size, Rear} ->
-            [Bin|Front] = lists:reverse(Rear),
-            deliver_data(DistHandle, Front, Size, [], Bin);
-        {[Bin|Front], Size, Rear} ->
-            deliver_data(DistHandle, Front, Size, Rear, Bin)
-    end.
+input_deliver(Params, Seq, [], Size, []) ->
+    Size = 0, % Assert
+    input_handler(Params, Seq, [], Size, []);
+input_deliver(Params, Seq, [], Size, Rear) ->
+    [Bin|Front] = lists:reverse(Rear),
+    input_deliver(Params, Seq, Front, Size, [], Bin);
+input_deliver(Params, Seq, [Bin|Front], Size, Rear) ->
+    input_deliver(Params, Seq, Front, Size, Rear, Bin).
 %%
-deliver_data(DistHandle, Front, Size, Rear, Bin) ->
+input_deliver(Params, Seq, Front, Size, Rear, Bin) ->
     case Bin of
         <<DataSizeA:32, DataA:DataSizeA/binary,
           DataSizeB:32, DataB:DataSizeB/binary, Rest/binary>> ->
+            DistHandle = Params#params.dist_handle,
             erlang:dist_ctrl_put_data(DistHandle, DataA),
             erlang:dist_ctrl_put_data(DistHandle, DataB),
-            deliver_data(
-              DistHandle,
+            input_deliver(
+              Params, Seq,
               Front, Size - (4 + DataSizeA + 4 + DataSizeB), Rear,
               Rest);
         <<DataSize:32, Data:DataSize/binary, Rest/binary>> ->
+            DistHandle = Params#params.dist_handle,
             erlang:dist_ctrl_put_data(DistHandle, Data),
-            deliver_data(DistHandle, Front, Size - (4 + DataSize), Rear, Rest);
+            input_deliver(
+              Params, Seq,
+              Front, Size - (4 + DataSize), Rear,
+              Rest);
         <<DataSize:32, FirstData/binary>> ->
+            %% We do not have a complete packet in the first binary
             TotalSize = 4 + DataSize,
             if
                 TotalSize =< Size ->
+                    %% We have a complete packet queued
                     BinSize = byte_size(Bin),
                     {MoreData, Q} =
                         deq_iovec(
                           TotalSize - BinSize,
                           Front, Size - BinSize, Rear),
-                    erlang:dist_ctrl_put_data(DistHandle, [FirstData|MoreData]),
-                    deliver_data(DistHandle, Q);
-                true -> % Incomplete data
-                    {[Bin|Front], Size, Rear}
+                    DistHandle = Params#params.dist_handle,
+                    erlang:dist_ctrl_put_data(
+                      DistHandle, [FirstData|MoreData]),
+                    input_deliver(Params, Seq, Q);
+                true ->
+                    %% We an incomplete packet
+                    input_handler(Params, Seq, [Bin|Front], Size, Rear)
             end;
         <<_/binary>> ->
+            %% We do not have a size header in the first binary
             BinSize = byte_size(Bin),
             if
-                4 =< Size -> % Fragmented header - extract a header bin
-                    {RestHeader, {Front_1, _Size_1, Rear_1}} =
-                        deq_iovec(4 - BinSize, Front, Size - BinSize, Rear),
+                4 =< Size ->
+                    %% We have a size header queued
+                    %%
+                    %% Extract a binary with just the size header
+                    RestSize = 4 - BinSize,
+                    {RestHeader, Q} =
+                        deq_iovec(RestSize, Front, Size + RestSize, Rear),
                     Header = iolist_to_binary([Bin|RestHeader]),
-                    deliver_data(DistHandle, Front_1, Size, Rear_1, Header);
-                true -> % Incomplete header
-                    {[Bin|Front], Size, Rear}
+                    input_deliver(Params, Seq, Q, Header);
+                true ->
+                    %% We an incomplete size header
+                    input_handler(Params, Seq, [Bin|Front], Size, Rear)
             end
     end.
+%%
+input_deliver(Params, Seq, {Front, Size, Rear}) ->
+    input_deliver(Params, Seq, Front, Size, Rear).
+%%
+input_deliver(Params, Seq, {Front, Size, Rear}, Bin) ->
+    input_deliver(Params, Seq, Front, Size, Rear, Bin).
 
 %% -------------------------------------------------------------------------
 %% Encryption and decryption helpers
@@ -1485,7 +1519,7 @@ encrypt_and_send_rekey_chunk(
         gen_tcp:send(
           Socket,
           encrypt_chunk(
-            Params, Seq, [?REKEY_CHUNK, PubKeyA], byte_size(PubKeyA)))
+            Params, Seq, [?REKEY_CHUNK, PubKeyA], 1 + byte_size(PubKeyA)))
     of
         ok ->
             SharedSecret = compute_shared_secret(KeyPair, PubKeyB),
@@ -1524,20 +1558,19 @@ decrypt_chunk(
     ChunkLen = byte_size(Chunk),
     if
         ChunkLen < TagLen ->
+            error_logger:error_report(
+              [?FUNCTION_NAME,
+               {reason,short_chunk}]),
             error;
         true ->
             AAD = <<Seq:32, ChunkLen:32>>,
             IVBin = <<IVSalt/binary, (IVNo + Seq):48>>,
             CiphertextLen = ChunkLen - TagLen,
-            case Chunk of
-                <<Ciphertext:CiphertextLen/binary,
-                  CipherTag:TagLen/binary>> ->
-                    block_decrypt(
-                      Params, Seq, AeadCipher, Key, IVBin,
-                      Ciphertext, AAD, CipherTag);
-                _ ->
-                    error
-            end
+            <<Ciphertext:CiphertextLen/binary,
+              CipherTag:TagLen/binary>> = Chunk,
+            block_decrypt(
+              Params, Seq, AeadCipher, Key, IVBin,
+              Ciphertext, AAD, CipherTag)
     end.
 
 block_decrypt(
@@ -1549,9 +1582,9 @@ block_decrypt(
         crypto:crypto_one_time_aead(
           AeadCipher, Key, IV, Ciphertext, AAD, CipherTag, false)
     of
-        <<?REKEY_CHUNK, Rest/binary>> ->
+        <<?REKEY_CHUNK, Chunk/binary>> ->
             PubKeyLen = byte_size(PubKeyA),
-            case Rest of
+            case Chunk of
                 <<PubKeyB:PubKeyLen/binary>> ->
                     SharedSecret = compute_shared_secret(KeyPair, PubKeyB),
                     KeyLen = byte_size(Key),
@@ -1563,34 +1596,32 @@ block_decrypt(
                           SharedSecret, [Key, IV], KeyLen, IVLen),
                     Params#params{iv = {IVSalt, IVNo}, key = Key_1};
                 _ ->
+                    error_logger:error_report(
+                      [?FUNCTION_NAME,
+                       {reason,bad_rekey_chunk}]),
                     error
             end;
         Chunk when is_binary(Chunk) ->
             case Seq of
                 RekeyCount ->
                     %% This was one chunk too many without rekeying
+                    error_logger:error_report(
+                      [?FUNCTION_NAME,
+                       {reason,rekey_overdue}]),
                     error;
                 _ ->
                     Chunk
             end;
         error ->
+            error_logger:error_report(
+              [?FUNCTION_NAME,
+               {reason,decrypt_error}]),
             error
     end.
 
 %% -------------------------------------------------------------------------
 %% Queue of binaries i.e an iovec queue
 
-empty_q() ->
-    {[], 0, []}.
-
-enq_binary(Bin, {Front, Size, Rear}) ->
-    {Front, Size + byte_size(Bin), [Bin|Rear]}.
-
--ifdef(undefined).
-deq_iovec(GetSize, {Front, Size, Rear}) when GetSize =< Size ->
-    deq_iovec(GetSize, Front, Size, Rear, []).
--endif.
-%%
 deq_iovec(GetSize, Front, Size, Rear) ->
     deq_iovec(GetSize, Front, Size, Rear, []).
 %%
@@ -1613,7 +1644,7 @@ deq_iovec(GetSize, [Bin|Front], Size, Rear, Acc) ->
 
 death_row(Reason) ->
     error_logger:info_report(
-      [death_row,
+      [?FUNCTION_NAME,
        {reason, Reason},
        {pid, self()}]),
     receive after 5000 -> exit(Reason) end.
@@ -1633,18 +1664,18 @@ monitor_dist_proc(Tag, Pid) ->
       fun () ->
               MRef = erlang:monitor(process, Pid),
               error_logger:info_report(
-                [monitor_dist_proc,
+                [?FUNCTION_NAME,
                  {type, Tag},
                  {pid, Pid}]),
               receive
                   {'DOWN', MRef, _, _, normal} ->
                       error_logger:error_report(
-                        [dist_proc_died,
+                        [?FUNCTION_NAME,
                          {reason, normal},
                          {pid, Pid}]);
                   {'DOWN', MRef, _, _, Reason} ->
                       error_logger:info_report(
-                        [dist_proc_died,
+                        [?FUNCTION_NAME,
                          {reason, Reason},
                          {pid, Pid}])
               end
-- 
2.35.3

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File 4472-Rewrite-input_handler-loop.patch of Package erlang (Revision 0b3a6d6e89afeaba4dcdf8fb3d620103)

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