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90 lines
2.4 KiB
Text
90 lines
2.4 KiB
Text
##! File extraction and introspection for DCC transfers over IRC.
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##!
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##! There is a major problem with this script in the cluster context because
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##! we might see A send B a message that a DCC connection is to be expected,
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##! but that connection will actually be between B and C which could be
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##! analyzed on a different worker.
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##!
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# Example line from IRC server indicating that the DCC SEND is about to start:
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# PRIVMSG my_nick :^ADCC SEND whateverfile.zip 3640061780 1026 41709^A
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@load ./main
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@load base/utils/files
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module IRC;
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export {
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redef record Info += {
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## DCC filename requested.
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dcc_file_name: string &log &optional;
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## Size of the DCC transfer as indicated by the sender.
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dcc_file_size: count &log &optional;
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## Sniffed mime type of the file.
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dcc_mime_type: string &log &optional;
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};
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}
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global dcc_expected_transfers: table[addr, port] of Info &synchronized &read_expire=5mins;
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function log_dcc(f: fa_file)
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{
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if ( ! f?$conns ) return;
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for ( cid in f$conns )
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{
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local c: connection = f$conns[cid];
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if ( [cid$resp_h, cid$resp_p] !in dcc_expected_transfers ) next;
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local irc = dcc_expected_transfers[cid$resp_h, cid$resp_p];
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local tmp = irc$command;
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irc$command = "DCC";
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Log::write(IRC::LOG, irc);
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irc$command = tmp;
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# Delete these values in case another DCC transfer
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# happens during the IRC session.
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delete irc$dcc_file_name;
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delete irc$dcc_file_size;
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delete irc$dcc_mime_type;
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delete dcc_expected_transfers[cid$resp_h, cid$resp_p];
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return;
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}
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}
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event file_new(f: fa_file) &priority=-5
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{
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if ( f$source == "IRC_DATA" )
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log_dcc(f);
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}
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event irc_dcc_message(c: connection, is_orig: bool,
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prefix: string, target: string,
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dcc_type: string, argument: string,
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address: addr, dest_port: count, size: count) &priority=5
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{
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set_session(c);
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if ( dcc_type != "SEND" )
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return;
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c$irc$dcc_file_name = argument;
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c$irc$dcc_file_size = size;
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local p = count_to_port(dest_port, tcp);
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Analyzer::schedule_analyzer(0.0.0.0, address, p, Analyzer::ANALYZER_IRC_DATA, 5 min);
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dcc_expected_transfers[address, p] = c$irc;
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}
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event scheduled_analyzer_applied(c: connection, a: Analyzer::Tag) &priority=10
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{
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local id = c$id;
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if ( [id$resp_h, id$resp_p] in dcc_expected_transfers )
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add c$service["irc-dcc-data"];
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}
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event connection_state_remove(c: connection) &priority=-5
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{
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if ( [c$id$resp_h, c$id$resp_p] in dcc_expected_transfers )
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delete dcc_expected_transfers[c$id$resp_h, c$id$resp_p];
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}
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