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FileAnalysis: file handles now set from events.

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Versus from synchronous function calls, which doesn't work well because
the function call can see a script-layer state that doesn't reflect
the state as it will be in terms of the event/network stream.
This commit is contained in:
Jon Siwek 2013-03-25 15:37:58 -05:00
parent 00a1de3593
commit 84a0c2fdac
21 changed files with 362 additions and 392 deletions
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40
scripts/base/protocols/http/file-analysis.bro
View file

@ -5,18 +5,32 @@
module HTTP;
function get_file_handle(c: connection, is_orig: bool): string
export {
## Determines whether the default :bro:see:`get_file_handle` handler
## is used to return file handles to the file analysis framework.
## Redefine to true in order to provide a custom handler which overrides
## the default HTTP.
const disable_default_file_handle_provider: bool = F &redef;
## Default file handle provider for HTTP.
function get_file_handle(c: connection, is_orig: bool): string
{
if ( ! c?$http ) return "";
if ( c$http$range_request )
return fmt("%s %s %s %s", ANALYZER_HTTP, is_orig, c$id$orig_h,
build_url(c$http));
return fmt("%s %s %s %s %s", ANALYZER_HTTP, c$start_time, is_orig,
c$http$trans_depth, id_string(c$id));
}
}
module GLOBAL;
event get_file_handle(tag: AnalyzerTag, c: connection, is_orig: bool)
{
if ( ! c?$http ) return "";
if ( c$http$range_request )
return fmt("%s %s %s %s", ANALYZER_HTTP, is_orig, c$id$orig_h,
build_url(c$http));
return fmt("%s %s %s %s %s", ANALYZER_HTTP, c$start_time, is_orig,
c$http$trans_depth, id_string(c$id));
if ( tag != ANALYZER_HTTP ) return;
if ( HTTP::disable_default_file_handle_provider ) return;
return_file_handle(HTTP::get_file_handle(c, is_orig));
}
redef FileAnalysis::handle_callbacks += {
[ANALYZER_HTTP] = get_file_handle,
};