mirror of
https://github.com/zeek/zeek.git
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341 lines
6.8 KiB
Text
341 lines
6.8 KiB
Text
%{
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#include <stdio.h>
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#include "RuleMatcher.h"
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#include "Reporter.h"
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extern void begin_PS();
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extern void end_PS();
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Rule* current_rule = 0;
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const char* current_rule_file = 0;
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%}
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%token TOK_COMP
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%token TOK_DISABLE
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%token TOK_DST_IP
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%token TOK_DST_PORT
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%token TOK_ENABLE
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%token TOK_EVAL
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%token TOK_EVENT
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%token TOK_HEADER
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%token TOK_IDENT
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%token TOK_INT
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%token TOK_IP
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%token TOK_IP_OPTIONS
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%token TOK_IP_OPTION_SYM
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%token TOK_IP_PROTO
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%token TOK_PATTERN
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%token TOK_PATTERN_TYPE
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%token TOK_PAYLOAD_SIZE
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%token TOK_PROT
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%token TOK_REQUIRES_SIGNATURE
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%token TOK_REQUIRES_REVERSE_SIGNATURE
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%token TOK_SIGNATURE
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%token TOK_SAME_IP
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%token TOK_SRC_IP
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%token TOK_SRC_PORT
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%token TOK_TCP_STATE
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%token TOK_STRING
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%token TOK_TCP_STATE_SYM
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%token TOK_ACTIVE
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%token TOK_BOOL
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%token TOK_POLICY_SYMBOL
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%type <str> TOK_STRING TOK_IDENT TOK_POLICY_SYMBOL TOK_PATTERN pattern string
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%type <val> TOK_INT TOK_TCP_STATE_SYM TOK_IP_OPTION_SYM TOK_COMP
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%type <val> integer ipoption_list tcpstate_list
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%type <rule> rule
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%type <bl> TOK_BOOL
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%type <hdr_test> hdr_expr
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%type <range> range rangeopt
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%type <vallist> value_list
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%type <mval> TOK_IP value
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%type <prot> TOK_PROT
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%type <ptype> TOK_PATTERN_TYPE
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%union {
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Rule* rule;
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RuleHdrTest* hdr_test;
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maskedvalue_list* vallist;
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bool bl;
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int val;
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char* str;
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MaskedValue mval;
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RuleHdrTest::Prot prot;
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Range range;
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Rule::PatternType ptype;
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}
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%%
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rule_list:
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rule_list rule
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{ rule_matcher->AddRule($2); }
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;
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rule:
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TOK_SIGNATURE TOK_IDENT
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{
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Location l(current_rule_file, rules_line_number+1, 0, 0, 0);
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current_rule = new Rule(yylval.str, l);
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}
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'{' rule_attr_list '}'
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{ $$ = current_rule; }
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;
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rule_attr_list:
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rule_attr_list rule_attr
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;
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rule_attr:
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TOK_DST_IP TOK_COMP value_list
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{
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current_rule->AddHdrTest(new RuleHdrTest(
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RuleHdrTest::IP, 16, 4,
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(RuleHdrTest::Comp) $2, $3));
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}
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| TOK_DST_PORT TOK_COMP value_list
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{ // Works for both TCP and UDP
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current_rule->AddHdrTest(new RuleHdrTest(
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RuleHdrTest::TCP, 2, 2,
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(RuleHdrTest::Comp) $2, $3));
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}
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| TOK_EVAL { begin_PS(); } TOK_POLICY_SYMBOL { end_PS(); }
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{
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current_rule->AddCondition(new RuleConditionEval($3));
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}
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| TOK_HEADER hdr_expr
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{ current_rule->AddHdrTest($2); }
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| TOK_IP_OPTIONS ipoption_list
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{
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current_rule->AddCondition(
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new RuleConditionIPOptions($2));
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}
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| TOK_IP_PROTO TOK_COMP TOK_PROT
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{
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int proto = 0;
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switch ( $3 ) {
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case RuleHdrTest::ICMP: proto = 1; break;
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case RuleHdrTest::IP: proto = 0; break;
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case RuleHdrTest::TCP: proto = 6; break;
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case RuleHdrTest::UDP: proto = 17; break;
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default:
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rules_error("internal_error: unknown protocol");
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}
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if ( proto )
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{
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maskedvalue_list* vallist = new maskedvalue_list;
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MaskedValue* val = new MaskedValue();
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val->val = proto;
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val->mask = 0xffffffff;
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vallist->append(val);
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current_rule->AddHdrTest(new RuleHdrTest(
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RuleHdrTest::IP, 9, 1,
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(RuleHdrTest::Comp) $2, vallist));
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}
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}
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| TOK_IP_PROTO TOK_COMP value_list
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{
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current_rule->AddHdrTest(new RuleHdrTest(
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RuleHdrTest::IP, 9, 1,
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(RuleHdrTest::Comp) $2, $3));
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}
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| TOK_EVENT string
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{ current_rule->AddAction(new RuleActionEvent($2)); }
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| TOK_ENABLE TOK_STRING
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{ current_rule->AddAction(new RuleActionEnable($2)); }
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| TOK_DISABLE TOK_STRING
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{ current_rule->AddAction(new RuleActionDisable($2)); }
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| TOK_PATTERN_TYPE pattern
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{ current_rule->AddPattern($2, $1); }
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| TOK_PATTERN_TYPE '[' rangeopt ']' pattern
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{
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if ( $3.offset > 0 )
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reporter->Warning("Offsets are currently ignored for patterns");
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current_rule->AddPattern($5, $1, 0, $3.len);
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}
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| TOK_PAYLOAD_SIZE TOK_COMP integer
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{
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current_rule->AddCondition(
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new RuleConditionPayloadSize($3, (RuleConditionPayloadSize::Comp) ($2)));
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}
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| TOK_REQUIRES_SIGNATURE TOK_IDENT
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{ current_rule->AddRequires($2, 0, 0); }
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| TOK_REQUIRES_SIGNATURE '!' TOK_IDENT
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{ current_rule->AddRequires($3, 0, 1); }
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| TOK_REQUIRES_REVERSE_SIGNATURE TOK_IDENT
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{ current_rule->AddRequires($2, 1, 0); }
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| TOK_REQUIRES_REVERSE_SIGNATURE '!' TOK_IDENT
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{ current_rule->AddRequires($3, 1, 1); }
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| TOK_SAME_IP
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{ current_rule->AddCondition(new RuleConditionSameIP()); }
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| TOK_SRC_IP TOK_COMP value_list
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{
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current_rule->AddHdrTest(new RuleHdrTest(
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RuleHdrTest::IP, 12, 4,
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(RuleHdrTest::Comp) $2, $3));
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}
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| TOK_SRC_PORT TOK_COMP value_list
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{ // Works for both TCP and UDP
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current_rule->AddHdrTest(new RuleHdrTest(
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RuleHdrTest::TCP, 0, 2,
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(RuleHdrTest::Comp) $2, $3));
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}
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| TOK_TCP_STATE tcpstate_list
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{
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current_rule->AddCondition(new RuleConditionTCPState($2));
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}
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| TOK_ACTIVE TOK_BOOL
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{ current_rule->SetActiveStatus($2); }
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;
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hdr_expr:
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TOK_PROT '[' range ']' '&' integer TOK_COMP value
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{
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maskedvalue_list* vallist = new maskedvalue_list;
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MaskedValue* val = new MaskedValue();
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val->val = $8.val;
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val->mask = $6;
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vallist->append(val);
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$$ = new RuleHdrTest($1, $3.offset, $3.len,
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(RuleHdrTest::Comp) $7, vallist);
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}
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| TOK_PROT '[' range ']' TOK_COMP value_list
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{
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$$ = new RuleHdrTest($1, $3.offset, $3.len,
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(RuleHdrTest::Comp) $5, $6);
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}
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;
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value_list:
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value_list ',' value
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{ $1->append(new MaskedValue($3)); $$ = $1; }
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| value_list ',' TOK_IDENT
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{ id_to_maskedvallist($3, $1); $$ = $1; }
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| value
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{
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$$ = new maskedvalue_list();
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$$->append(new MaskedValue($1));
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}
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| TOK_IDENT
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{
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$$ = new maskedvalue_list();
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id_to_maskedvallist($1, $$);
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}
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;
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value:
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TOK_INT
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{ $$.val = $1; $$.mask = 0xffffffff; }
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| TOK_IP
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;
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rangeopt:
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range
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{ $$ = $1; }
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| ':' integer
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{ $$.offset = 0; $$.len = $2; }
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| integer ':'
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{ $$.offset = $1; $$.len = UINT_MAX; }
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;
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range:
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integer
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{ $$.offset = $1; $$.len = 1; }
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| integer ':' integer
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{ $$.offset = $1; $$.len = $3; }
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;
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ipoption_list:
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ipoption_list ',' TOK_IP_OPTION_SYM
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{ $$ = $1 | $3; }
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| TOK_IP_OPTION_SYM
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{ $$ = $1; }
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;
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tcpstate_list:
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tcpstate_list ',' TOK_TCP_STATE_SYM
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{ $$ = $1 | $3; }
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| TOK_TCP_STATE_SYM
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{ $$ = $1; }
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;
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integer:
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TOK_INT
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{ $$ = $1; }
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| TOK_IDENT
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{ $$ = id_to_uint($1); }
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;
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string:
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TOK_STRING
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{ $$ = $1; }
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| TOK_IDENT
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{ $$ = id_to_str($1); }
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;
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pattern:
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TOK_PATTERN
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{ $$ = $1; }
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| TOK_IDENT
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{ $$ = id_to_str($1); }
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;
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%%
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void rules_error(const char* msg)
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{
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reporter->Error("Error in signature (%s:%d): %s\n",
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current_rule_file, rules_line_number+1, msg);
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rule_matcher->SetParseError();
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}
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void rules_error(const char* msg, const char* addl)
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{
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reporter->Error("Error in signature (%s:%d): %s (%s)\n",
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current_rule_file, rules_line_number+1, msg, addl);
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rule_matcher->SetParseError();
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}
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void rules_error(Rule* r, const char* msg)
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{
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const Location& l = r->GetLocation();
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reporter->Error("Error in signature %s (%s:%d): %s\n",
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r->ID(), l.filename, l.first_line, msg);
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rule_matcher->SetParseError();
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}
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int rules_wrap(void)
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{
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return 1;
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}
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