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Initial rework of packet filter framework.

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- Large rework on packet filter framework to make many things easier.
   - Removed the PacketFilter::all_packets variable because it was confusing.
   - New variable (PacketFilter::enable_auto_protocol_capture_filters) to re-enable the old filtering model of only sniffing ports for analyzed protocols.
   - In progress plugin model for adding filtering mechanisms.
   - New default single item for capture_filters = { ["default"] = PacketFilter::default_capture_filter };
   - Mechanism and helper functions to "shunt" traffic with filters.

- Created the Protocols framework to assist with reworking how base protocol scripts are registered with DPD and other things.
   - Protocols framework creates BPF filters for registered analyzers. (if using PacketFilter framework in that mode).
This commit is contained in:
Seth Hall 2012-02-16 11:14:57 -05:00
parent 600d015dab
commit 430cd9b146
18 changed files with 403 additions and 161 deletions
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23
scripts/base/protocols/dns/main.bro
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@ -1,6 +1,7 @@
##! Base DNS analysis script which tracks and logs DNS queries along with
##! their responses.
@load base/frameworks/protocols
@load ./consts
module DNS;
@ -109,23 +110,11 @@ redef record connection += {
dns_state: State &optional;
};
# DPD configuration.
redef capture_filters += {
["dns"] = "port 53",
["mdns"] = "udp and port 5353",
["llmns"] = "udp and port 5355",
["netbios-ns"] = "udp port 137",
};
const dns_ports = { 53/udp, 53/tcp, 137/udp, 5353/udp, 5355/udp };
redef dpd_config += { [ANALYZER_DNS] = [$ports = dns_ports] };
const dns_udp_ports = { 53/udp, 137/udp, 5353/udp, 5355/udp };
const dns_tcp_ports = { 53/tcp };
redef dpd_config += { [ANALYZER_DNS_UDP_BINPAC] = [$ports = dns_udp_ports] };
redef dpd_config += { [ANALYZER_DNS_TCP_BINPAC] = [$ports = dns_tcp_ports] };
redef likely_server_ports += { 53/udp, 53/tcp, 137/udp, 5353/udp, 5355/udp };
# Not attaching ANALYZER_DNS_UDP_BINPAC and ANALYZER_DNS_TCP_BINPAC right now.
global analyzers = { ANALYZER_DNS };
redef Protocols::analyzer_map["DNS"] = analyzers;
global ports = { 53/udp, 53/tcp, 137/udp, 5353/udp, 5355/udp };
redef Protocols::common_ports["DNS"] = ports;
event bro_init() &priority=5
{