Fix origin handling and fix lines which start with ownernames
Zonefile handling is more robust and more up to the specs. Also added a new zone file which has some nice properties which trigger corner cases.
This commit is contained in:
parent
cb1d41c607
commit
697d67ea96
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@ -0,0 +1,30 @@
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$ORIGIN .
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$TTL 3600 ; 1 hour
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name IN SOA a6.nstld.com. hostmaster.nic.name. (
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203362132 ; serial
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300 ; refresh (5 minutes)
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300 ; retry (5 minutes)
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1209600 ; expire (2 weeks)
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300 ; minimum (5 minutes)
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)
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$TTL 10800 ; 3 hours
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NS g6.nstld.com.
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NS h6.nstld.com.
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NS j6.nstld.com.
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NS k6.nstld.com.
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NS l6.nstld.com.
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NS a6.nstld.com.
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NS c6.nstld.com.
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NS d6.nstld.com.
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NS f6.nstld.com.
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NS m6.nstld.com.
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$ORIGIN name.
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0-0onlus NS ns7.ehiweb.it.
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NS ns8.ehiweb.it.
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0-g MX 10 mx01.nic
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MX 10 mx02.nic
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MX 10 mx03.nic
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MX 10 mx04.nic
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$ORIGIN 0-g.name
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moutamassey NS ns01.yahoodomains.jp.
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NS ns02.yahoodomains.jp.
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203
zscan.go
203
zscan.go
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@ -132,7 +132,8 @@ func parseZone(r io.Reader, origin, f string, t chan Token, include int) {
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s.Whitespace = 0
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// Start the lexer
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go zlexer(s, c)
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// 5 possible beginnings of a line, _ is a space
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// 6 possible beginnings of a line, _ is a space
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// 0. _ _RRTYPE -> all omitted until the rrtype
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// 1. _OWNER _ _RRTYPE -> class/ttl omitted
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// 2. _OWNER _ _STRING _ _RRTYPE -> class omitted
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// 3. _OWNER _ _STRING _ _CLASS _ _RRTYPE -> ttl/class
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@ -141,17 +142,18 @@ func parseZone(r io.Reader, origin, f string, t chan Token, include int) {
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// After detecting these, we know the _RRTYPE so we can jump to functions
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// handling the rdata for each of these types.
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if origin == "" {
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origin = "."
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}
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if _, _, ok := IsDomainName(origin); !ok {
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t <- Token{Error: &ParseError{f, "bad origin name", lex{}}}
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return
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}
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if origin == "" {
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origin = "."
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}
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if _, _, ok := IsDomainName(origin); !ok {
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t <- Token{Error: &ParseError{f, "bad origin name", lex{}}}
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return
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}
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st := _EXPECT_OWNER_DIR
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var h RR_Header
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var ok bool
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var defttl uint32 = DefaultTtl
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var prevName string
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for l := range c {
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if _DEBUG {
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fmt.Printf("[%v]\n", l)
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@ -172,19 +174,21 @@ func parseZone(r io.Reader, origin, f string, t chan Token, include int) {
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st = _EXPECT_OWNER_DIR
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case _OWNER:
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h.Name = l.token
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if l.token == "@" {
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h.Name = origin
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st = _EXPECT_OWNER_BL
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break
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}
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if l.token == "@" {
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h.Name = origin
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prevName = h.Name
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st = _EXPECT_OWNER_BL
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break
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}
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_, ld, ok := IsDomainName(l.token)
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if !ok {
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t <- Token{Error: &ParseError{f, "bad owner name", l}}
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return
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}
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if h.Name[ld-1] != '.' {
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h.Name += origin
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h.Name = appendOrigin(h.Name, origin)
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}
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prevName = h.Name
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st = _EXPECT_OWNER_BL
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case _DIRTTL:
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st = _EXPECT_DIRTTL_BL
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@ -192,8 +196,23 @@ func parseZone(r io.Reader, origin, f string, t chan Token, include int) {
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st = _EXPECT_DIRORIGIN_BL
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case _DIRINCLUDE:
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st = _EXPECT_DIRINCLUDE_BL
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case _RRTYPE:
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// Everthing has been omitted
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h.Name = prevName
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h.Rrtype, ok = Str_rr[strings.ToUpper(l.token)]
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if !ok {
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if h.Rrtype, ok = typeToInt(l.token); !ok {
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t <- Token{Error: &ParseError{f, "Unknown RR type", l}}
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return
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}
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}
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st = _EXPECT_RDATA
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case _BLANK:
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// Discard, can happen when there is nothing on the
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// line except the RR type
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default:
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t <- Token{Error: &ParseError{f, "Error at the start", l}}
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println(l.value)
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t <- Token{Error: &ParseError{f, "Error at beginning", l}}
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return
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}
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case _EXPECT_DIRINCLUDE_BL:
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@ -235,8 +254,10 @@ func parseZone(r io.Reader, origin, f string, t chan Token, include int) {
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}
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if e := slurpRemainder(c, f); e != nil {
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t <- Token{Error: e}
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return
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}
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if ttl, ok := stringToTtl(l, f, t); !ok {
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t <- Token{Error: &ParseError{f, "Expecting $TTL value, not this...", l}}
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return
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} else {
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defttl = ttl
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@ -257,9 +278,13 @@ func parseZone(r io.Reader, origin, f string, t chan Token, include int) {
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t <- Token{Error: e}
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}
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if !IsFqdn(l.token) {
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origin = l.token + "." + origin // Append old origin if the new one isn't a fqdn
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if origin != "." { // Prevent .. endings
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origin = l.token + "." + origin
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} else {
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origin = l.token + origin
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}
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} else {
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origin = "." + l.token
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origin = l.token
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}
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st = _EXPECT_OWNER_DIR
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case _EXPECT_OWNER_BL:
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@ -272,12 +297,12 @@ func parseZone(r io.Reader, origin, f string, t chan Token, include int) {
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switch l.value {
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case _RRTYPE:
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h.Rrtype, ok = Str_rr[strings.ToUpper(l.token)]
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if !ok {
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if h.Rrtype, ok = typeToInt(l.token); !ok {
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if !ok {
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if h.Rrtype, ok = typeToInt(l.token); !ok {
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t <- Token{Error: &ParseError{f, "Unknown RR type", l}}
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return
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}
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}
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}
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}
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st = _EXPECT_RDATA
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case _CLASS:
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h.Class, ok = Str_class[strings.ToUpper(l.token)]
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@ -325,12 +350,12 @@ func parseZone(r io.Reader, origin, f string, t chan Token, include int) {
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st = _EXPECT_RRTYPE_BL
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case _RRTYPE:
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h.Rrtype, ok = Str_rr[strings.ToUpper(l.token)]
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if !ok {
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if h.Rrtype, ok = typeToInt(l.token); !ok {
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if !ok {
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if h.Rrtype, ok = typeToInt(l.token); !ok {
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t <- Token{Error: &ParseError{f, "Unknown RR type", l}}
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return
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}
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}
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}
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}
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st = _EXPECT_RDATA
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}
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case _EXPECT_ANY_NOCLASS:
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@ -345,12 +370,12 @@ func parseZone(r io.Reader, origin, f string, t chan Token, include int) {
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st = _EXPECT_RRTYPE_BL
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case _RRTYPE:
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h.Rrtype, ok = Str_rr[strings.ToUpper(l.token)]
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if !ok {
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if h.Rrtype, ok = typeToInt(l.token); !ok {
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if !ok {
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if h.Rrtype, ok = typeToInt(l.token); !ok {
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t <- Token{Error: &ParseError{f, "Unknown RR type", l}}
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return
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}
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}
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}
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}
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st = _EXPECT_RDATA
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default:
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t <- Token{Error: &ParseError{f, "Expecting RR type or TTL, not this...", l}}
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@ -368,12 +393,12 @@ func parseZone(r io.Reader, origin, f string, t chan Token, include int) {
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return
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}
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h.Rrtype, ok = Str_rr[strings.ToUpper(l.token)]
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if !ok {
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if h.Rrtype, ok = typeToInt(l.token); !ok {
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t <- Token{Error: &ParseError{f, "Unknown RR type", l}}
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return
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}
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}
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if !ok {
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if h.Rrtype, ok = typeToInt(l.token); !ok {
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t <- Token{Error: &ParseError{f, "Unknown RR type", l}}
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return
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}
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}
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st = _EXPECT_RDATA
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case _EXPECT_RDATA:
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// I could save my token here...? l
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@ -410,7 +435,11 @@ func (l lex) String() string {
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case _CLASS:
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return "C:" + l.token + "$"
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case _DIRTTL:
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return "T:" + l.token + "$"
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return "$T:" + l.token + "$"
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case _DIRORIGIN:
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return "$O:" + l.token + "$"
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case _DIRINCLUDE:
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return "$I:" + l.token + "$"
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}
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return "**"
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}
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@ -477,11 +506,11 @@ func zlexer(s scanner.Scanner, c chan lex) {
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l.value = _RRTYPE
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rrtype = true
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} else {
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if strings.HasPrefix(strings.ToUpper(l.token), "TYPE") {
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l.value = _RRTYPE
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rrtype = true
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}
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}
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if strings.HasPrefix(strings.ToUpper(l.token), "TYPE") {
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l.value = _RRTYPE
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rrtype = true
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}
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}
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if _, ok := Str_class[strings.ToUpper(l.token)]; ok {
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l.value = _CLASS
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} else {
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@ -521,9 +550,9 @@ func zlexer(s scanner.Scanner, c chan lex) {
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stri = 0
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}
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commt = true
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case '\r':
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// discard
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// this means it can also not be used as rdata
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case '\r':
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// discard
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// this means it can also not be used as rdata
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case '\n':
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// hmmm, escape newline
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if quote {
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@ -629,17 +658,17 @@ func zlexer(s scanner.Scanner, c chan lex) {
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escape = false
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break
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}
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switch x[0] {
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case ')':
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brace--
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if brace < 0 {
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l.err = "extra closing brace"
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c <- l
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return
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}
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case '(':
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brace++
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}
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switch x[0] {
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case ')':
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brace--
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if brace < 0 {
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l.err = "extra closing brace"
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c <- l
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return
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}
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case '(':
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brace++
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}
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default:
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if commt {
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break
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@ -679,32 +708,40 @@ func typeToInt(token string) (uint16, bool) {
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}
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func stringToTtl(l lex, f string, t chan Token) (uint32, bool) {
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s := uint32(0)
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i := uint32(0)
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for _, c := range l.token {
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switch c {
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case 's', 'S':
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s += i
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i = 0
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case 'm', 'M':
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s += i * 60
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i = 0
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case 'h', 'H':
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s += i * 60 * 60
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i = 0
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case 'd', 'D':
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s += i * 60 * 60 * 24
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i = 0
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case 'w', 'W':
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s += i * 60 * 60 * 24 * 7
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i = 0
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case '0', '1', '2', '3', '4', '5', '6', '7', '8', '9':
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i *= 10
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i += uint32(c) - '0'
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default:
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t <- Token{Error: &ParseError{f, "Not a TTL", l}}
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return 0, false
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}
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}
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return s+i, true
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s := uint32(0)
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i := uint32(0)
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for _, c := range l.token {
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switch c {
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case 's', 'S':
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s += i
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i = 0
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case 'm', 'M':
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s += i * 60
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i = 0
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case 'h', 'H':
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s += i * 60 * 60
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i = 0
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case 'd', 'D':
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s += i * 60 * 60 * 24
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i = 0
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case 'w', 'W':
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s += i * 60 * 60 * 24 * 7
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i = 0
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case '0', '1', '2', '3', '4', '5', '6', '7', '8', '9':
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i *= 10
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i += uint32(c) - '0'
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default:
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t <- Token{Error: &ParseError{f, "Not a TTL", l}}
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return 0, false
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}
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}
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return s + i, true
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}
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func appendOrigin(name, origin string) string {
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if origin == "." {
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return name + origin
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}
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return name + "." + origin
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}
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31
zscan_rr.go
31
zscan_rr.go
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@ -1,13 +1,12 @@
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package dns
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import (
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"fmt"
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"net"
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"strconv"
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"strings"
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)
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// TODO: SPF, TKEY, Unknown RRs, RR_URI, DHCID, TLSA
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// TODO: SPF, TKEY, RR_URI, DHCID, TLSA
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// Parse the rdata of each rrtype.
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// All data from the channel c is either _STRING or _BLANK.
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@ -85,15 +84,9 @@ Slurp:
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func slurpRemainder(c chan lex, f string) *ParseError {
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l := <-c
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if _DEBUG {
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fmt.Printf("%v\n", l)
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}
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switch l.value {
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case _BLANK:
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l = <-c
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if _DEBUG {
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fmt.Printf("%v\n", l)
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}
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if l.value != _NEWLINE && l.value != _EOF {
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return &ParseError{f, "garbage after rdata", l}
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}
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@ -143,7 +136,7 @@ func setNS(h RR_Header, c chan lex, o, f string) (RR, *ParseError) {
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return nil, &ParseError{f, "bad NS Ns", l}
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}
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if rr.Ns[ld-1] != '.' {
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rr.Ns += o
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rr.Ns = appendOrigin(rr.Ns, o)
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}
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return rr, nil
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}
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@ -159,7 +152,7 @@ func setPTR(h RR_Header, c chan lex, o, f string) (RR, *ParseError) {
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return nil, &ParseError{f, "bad PTR Ptr", l}
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}
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if rr.Ptr[ld-1] != '.' {
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rr.Ptr += o
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rr.Ptr = appendOrigin(rr.Ptr, o)
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}
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return rr, nil
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}
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@ -182,7 +175,7 @@ func setMX(h RR_Header, c chan lex, o, f string) (RR, *ParseError) {
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return nil, &ParseError{f, "bad MX Mx", l}
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}
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if rr.Mx[ld-1] != '.' {
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rr.Mx += o
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rr.Mx = appendOrigin(rr.Mx, o)
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}
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return rr, nil
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}
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@ -198,7 +191,7 @@ func setCNAME(h RR_Header, c chan lex, o, f string) (RR, *ParseError) {
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return nil, &ParseError{f, "bad CNAME Cname", l}
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}
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if rr.Cname[ld-1] != '.' {
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rr.Cname += o
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rr.Cname = appendOrigin(rr.Cname, o)
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}
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return rr, nil
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}
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@ -214,7 +207,7 @@ func setDNAME(h RR_Header, c chan lex, o, f string) (RR, *ParseError) {
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return nil, &ParseError{f, "bad CNAME Target", l}
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}
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if rr.Target[ld-1] != '.' {
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rr.Target += o
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rr.Target = appendOrigin(rr.Target, o)
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}
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return rr, nil
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}
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@ -231,7 +224,7 @@ func setSOA(h RR_Header, c chan lex, o, f string) (RR, *ParseError) {
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return nil, &ParseError{f, "bad SOA Ns", l}
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}
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if rr.Ns[ld-1] != '.' {
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rr.Ns += o
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rr.Ns = appendOrigin(rr.Ns, o)
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}
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l = <-c
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@ -241,7 +234,7 @@ func setSOA(h RR_Header, c chan lex, o, f string) (RR, *ParseError) {
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return nil, &ParseError{f, "bad SOA Mbox", l}
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}
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if rr.Mbox[ld-1] != '.' {
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rr.Mbox += o
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rr.Mbox = appendOrigin(rr.Mbox, o)
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}
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<-c // _BLANK
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@ -304,7 +297,7 @@ func setSRV(h RR_Header, c chan lex, o, f string) (RR, *ParseError) {
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return nil, &ParseError{f, "bad SRV Target", l}
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}
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if rr.Target[ld-1] != '.' {
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rr.Target += o
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rr.Target = appendOrigin(rr.Target, o)
|
||||
}
|
||||
return rr, nil
|
||||
}
|
||||
|
@ -391,7 +384,7 @@ func setNAPTR(h RR_Header, c chan lex, o, f string) (RR, *ParseError) {
|
|||
return nil, &ParseError{f, "bad NAPTR Replacement", l}
|
||||
}
|
||||
if rr.Replacement[ld-1] != '.' {
|
||||
rr.Replacement += o
|
||||
rr.Replacement = appendOrigin(rr.Replacement, o)
|
||||
}
|
||||
return rr, nil
|
||||
}
|
||||
|
@ -498,7 +491,7 @@ func setRRSIG(h RR_Header, c chan lex, o, f string) (RR, *ParseError) {
|
|||
return nil, &ParseError{f, "bad RRSIG SignerName", l}
|
||||
}
|
||||
if rr.SignerName[ld-1] != '.' {
|
||||
rr.SignerName += o
|
||||
rr.SignerName = appendOrigin(rr.SignerName, o)
|
||||
}
|
||||
// Get the remaining data until we see a NEWLINE
|
||||
l = <-c
|
||||
|
@ -529,7 +522,7 @@ func setNSEC(h RR_Header, c chan lex, o, f string) (RR, *ParseError) {
|
|||
return nil, &ParseError{f, "bad NSEC NextDomain", l}
|
||||
}
|
||||
if rr.NextDomain[ld-1] != '.' {
|
||||
rr.NextDomain += o
|
||||
rr.NextDomain = appendOrigin(rr.NextDomain, o)
|
||||
}
|
||||
|
||||
rr.TypeBitMap = make([]uint16, 0)
|
||||
|
|
Loading…
Reference in New Issue