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Add the new pmatch operator.

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Make changes to the lua-specific rule parser/compiler to handle the
pmatch operator.
This commit is contained in:
Mark Stemm 2016-09-22 14:57:43 -07:00
parent 889b252a3f
commit 930b38b894
3 changed files with 5 additions and 3 deletions
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4
userspace/engine/lua/compiler.lua
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@ -143,7 +143,7 @@ function check_for_ignored_syscalls_events(ast, filter_type, source)
(node.left.value == "evt.type" or (node.left.value == "evt.type" or
node.left.value == "syscall.type") then node.left.value == "syscall.type") then
if node.operator == "in" then if node.operator == "in" or node.operator == "pmatch" then
for i, v in ipairs(node.right.elements) do for i, v in ipairs(node.right.elements) do
if v.type == "BareString" then if v.type == "BareString" then
if node.left.value == "evt.type" then if node.left.value == "evt.type" then
@ -200,7 +200,7 @@ function get_evttypes(name, ast, source)
if found_not then if found_not then
found_event_after_not = true found_event_after_not = true
end end
if node.operator == "in" then if node.operator == "in" or node.operator == "pmatch" then
for i, v in ipairs(node.right.elements) do for i, v in ipairs(node.right.elements) do
if v.type == "BareString" then if v.type == "BareString" then
evtnames[v.value] = 1 evtnames[v.value] = 1

2
userspace/engine/lua/parser.lua
View File

@ -199,6 +199,7 @@ local G = {
RelationalExpression = RelationalExpression =
rel(terminal "FieldName", V"RelOp", V"Value") + rel(terminal "FieldName", V"RelOp", V"Value") +
rel(terminal "FieldName", V"InOp", V"InList") + rel(terminal "FieldName", V"InOp", V"InList") +
rel(terminal "FieldName", V"PmatchOp", V"InList") +
V"PrimaryExp"; V"PrimaryExp";
PrimaryExp = symb("(") * V"Filter" * symb(")"); PrimaryExp = symb("(") * V"Filter" * symb(")");
@ -248,6 +249,7 @@ local G = {
symb("glob") / "glob" + symb("glob") / "glob" +
symb("startswith") / "startswith"; symb("startswith") / "startswith";
InOp = kw("in") / "in"; InOp = kw("in") / "in";
PmatchOp = kw("pmatch") / "pmatch";
UnaryBoolOp = kw("not") / "not"; UnaryBoolOp = kw("not") / "not";
ExistsOp = kw("exists") / "exists"; ExistsOp = kw("exists") / "exists";

2
userspace/engine/lua/rule_loader.lua
View File

@ -72,7 +72,7 @@ local function install_filter(node, parent_bool_op)
filter.unnest() -- io.write(")") filter.unnest() -- io.write(")")
elseif t == "BinaryRelOp" then elseif t == "BinaryRelOp" then
if (node.operator == "in") then if (node.operator == "in" or node.operator == "pmatch") then
elements = map(function (el) return el.value end, node.right.elements) elements = map(function (el) return el.value end, node.right.elements)
filter.rel_expr(node.left.value, node.operator, elements, node.index) filter.rel_expr(node.left.value, node.operator, elements, node.index)
else else