Limit $GENERATE range to 65535 steps (#1020)
* Limit $GENERATE range to 65535 steps Having these checks means all test in TestCrasherString() are not reached because we bail out earlier - removed that test all together. Fixes #1019 Signed-off-by: Miek Gieben <miek@miek.nl> * bring back testcase Signed-off-by: Miek Gieben <miek@miek.nl> * bring back crash test Signed-off-by: Miek Gieben <miek@miek.nl>
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@ -49,14 +49,14 @@ func (zp *ZoneParser) generate(l lex) (RR, bool) {
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if err != nil {
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return zp.setParseError("bad stop in $GENERATE range", l)
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}
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if end < 0 || start < 0 || end < start {
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if end < 0 || start < 0 || end < start || (end-start)/step > 65535 {
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return zp.setParseError("bad range in $GENERATE range", l)
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}
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// _BLANK
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l, ok := zp.c.Next()
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if !ok || l.value != zBlank {
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return zp.setParseError("garbage after $GENERATE range", l)
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return zp.setParseError("garbage after $GENERATE range", l)
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}
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// Create a complete new string, which we then parse again.
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@ -205,16 +205,14 @@ $GENERATE 32-158 dhcp-${-32,4,d} A 10.0.0.$
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}
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}
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func TestCrasherString(t *testing.T) {
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tests := []struct{
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in string
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err string
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}{
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{"$GENERATE 0-300103\"$$GENERATE 2-2", "dns: garbage after $GENERATE range: \"\\\"\" at line: 1:19"},
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{"$GENERATE 0-5414137360", "dns: garbage after $GENERATE range: \"\\n\" at line: 1:22"},
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{"$GENERATE 11522-3668518066406258", "dns: garbage after $GENERATE range: \"\\n\" at line: 1:38"},
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tests := []struct {
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in string
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err string
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}{
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{"$GENERATE 0-300103\"$$GENERATE 2-2", "bad range in $GENERATE"},
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{"$GENERATE 0-5414137360", "bad range in $GENERATE"},
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{"$GENERATE 11522-3668518066406258", "bad range in $GENERATE"},
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{"$GENERATE 0-200\"(;00000000000000\n$$GENERATE 0-0", "dns: garbage after $GENERATE range: \"\\\"\" at line: 1:16"},
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}
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for _, tc := range tests {
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@ -223,7 +221,7 @@ func TestCrasherString(t *testing.T) {
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if err == nil {
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t.Errorf("Expecting error for crasher line %s", tc.in)
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}
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if tc.err != err.Error() {
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if !strings.Contains(err.Error(), tc.err) {
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t.Errorf("Expecting error %s, got %s", tc.err, err.Error())
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}
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})
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6
scan.go
6
scan.go
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@ -134,7 +134,7 @@ func ReadRR(r io.Reader, file string) (RR, error) {
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}
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// ParseZone reads a RFC 1035 style zonefile from r. It returns
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// *Tokens on the returned channel, each consisting of either a
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// Tokens on the returned channel, each consisting of either a
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// parsed RR and optional comment or a nil RR and an error. The
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// channel is closed by ParseZone when the end of r is reached.
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//
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@ -143,7 +143,8 @@ func ReadRR(r io.Reader, file string) (RR, error) {
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// origin, as if the file would start with an $ORIGIN directive.
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//
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// The directives $INCLUDE, $ORIGIN, $TTL and $GENERATE are all
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// supported.
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// supported. Note that $GENERATE's range support up to a maximum of
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// of 65535 steps.
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//
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// Basic usage pattern when reading from a string (z) containing the
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// zone data:
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@ -203,6 +204,7 @@ func parseZone(r io.Reader, origin, file string, t chan *Token) {
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//
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// The directives $INCLUDE, $ORIGIN, $TTL and $GENERATE are all
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// supported. Although $INCLUDE is disabled by default.
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// Note that $GENERATE's range support up to a maximum of 65535 steps.
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//
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// Basic usage pattern when reading from a string (z) containing the
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// zone data:
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