test: dhcp request flood test

Tests that a DHCP request flood doesn't take an excessive amount
of time.

Skipped by default.

Related ticket #3345:
https://redmine.openinfosecfoundation.org/issues/3345

diff --git a/tests/dhcp-request-flood/README.md b/tests/dhcp-request-flood/README.md
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+Test that Suricata can process this DHCP request flood without
+significant slowdown.
+
+DHCP rules are required to trigger this condition.
+
+Related ticket:
+https://redmine.openinfosecfoundation.org/issues/3345

diff --git a/tests/dhcp-request-flood/suricata.yaml b/tests/dhcp-request-flood/suricata.yaml
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+++ b/tests/dhcp-request-flood/suricata.yaml
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+%YAML 1.1
+---
+
+outputs:
+  - eve-log:
+      enabled: yes
+      types:
+        - dhcp:
+            enabled: yes
+            extended: yes

diff --git a/tests/dhcp-request-flood/test.pcap b/tests/dhcp-request-flood/test.pcap
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Binary files /dev/null and b/tests/dhcp-request-flood/test.pcap differ

diff --git a/tests/dhcp-request-flood/test.rules b/tests/dhcp-request-flood/test.rules
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+++ b/tests/dhcp-request-flood/test.rules
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+# DHCP app-layer event rules.  See
+#
+# https://redmine.openinfosecfoundation.org/projects/suricata/wiki/AppLayer
+# for SID allocation.
+
+alert dhcp any any -> any any (msg:"SURICATA DHCP malformed options"; app-layer-event:dhcp.malformed_options; classtype:protocol-command-decode; sid:2227000; rev:1;)
+alert dhcp any any -> any any (msg:"SURICATA DHCP truncated options"; app-layer-event:dhcp.truncated_options; classtype:protocol-command-decode; sid:2227001; rev:1;)

diff --git a/tests/dhcp-request-flood/test.yaml b/tests/dhcp-request-flood/test.yaml
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+++ b/tests/dhcp-request-flood/test.yaml
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+# Skip by default, can take a long time to run until Suricata is fixed
+# for this case.
+skip: true
+
+checks:
+  - filter:
+      count: 10000
+      match:
+        event_type: dhcp