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mysql: Simplify length computation

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Thanks Tim!
This commit is contained in:
Arne Welzel 2024-07-25 11:45:13 +02:00
parent 4adea7978c
commit 2e1e57033d
1 changed files with 8 additions and 2 deletions
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10
src/analyzer/protocol/mysql/mysql-protocol.pac
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@ -345,7 +345,7 @@ type Handshake_v10 = record {
character_set : uint8;
status_flags : uint16;
capability_flags_2 : uint16;
auth_plugin_data_len : uint8;
auth_plugin_data_len : uint8 &enforce( auth_plugin_data_len==0 || auth_plugin_data_len >= 21);
reserved : padding[10];
auth_plugin_data_part_2: bytestring &length=auth_plugin_data_part_2_len;
have_plugin : case ( ( capability_flags_2 << 16 ) & CLIENT_PLUGIN_AUTH ) of {
@ -353,7 +353,13 @@ type Handshake_v10 = record {
0x0 -> none : empty;
};
} &let {
auth_plugin_data_part_2_len = (auth_plugin_data_len > 8 && (auth_plugin_data_len - 8) > 13) ? auth_plugin_data_len - 8 : 13;
# The length of auth_plugin_data_part_2 is at least 13 bytes,
# or auth_plugin_data_len - 8 if that is larger, check for
# auth_plugin_data_len > 21 (8 + 13) to prevent underflow for
# when subtracting 8.
#
# https://dev.mysql.com/doc/dev/mysql-server/latest/page_protocol_connection_phase_packets_protocol_handshake_v10.html
auth_plugin_data_part_2_len = auth_plugin_data_len > 21 ? auth_plugin_data_len - 8 : 13;
update_auth_plugin: bool = $context.connection.set_auth_plugin(auth_plugin)
&if( ( capability_flags_2 << 16 ) & CLIENT_PLUGIN_AUTH );
server_query_attrs: bool = $context.connection.set_server_query_attrs(( capability_flags_2 << 16 ) & CLIENT_QUERY_ATTRIBUTES);