dont delete it
This commit is contained in:
Miek Gieben
parent
5fe15bc754
commit
c5e26c4313
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package dns
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// Parse RRs
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// With the thankful help of gdnsd and the Go examples for Ragel.
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//
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import (
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"os"
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"io"
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"net"
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"strconv"
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)
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const _RDATAMAX = 7
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const _IOBUF = 65365
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// Save up tokens, after we've seen the entire rdata
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// we can use this.
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type token struct {
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T []string // text
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N []int // number
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ti int // text counter
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ni int // number counter
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}
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func newToken() *token {
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to := new(token)
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to.T = make([]string, _RDATAMAX)
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to.N = make([]int, _RDATAMAX)
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to.ni, to.ti = 0, 0
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return to
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}
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// Only push functions are provided. Reading is done, by directly
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// accessing the members (T and N). See types.rl.
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func (to *token) pushInt(s string) {
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i, err := strconv.Atoi(s)
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if err != nil {
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panic("Failure to parse to int: " + s)
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}
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to.N[to.ni] = i
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to.ni++
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if to.ni > _RDATAMAX {
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panic("Too much rdata (int)")
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}
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}
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func (to *token) pushString(s string) {
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to.T[to.ti] = s
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to.ti++
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if to.ti > _RDATAMAX {
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panic("Too much rdata (string)")
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}
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}
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func (to *token) reset() {
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to.ni, to.ti = 0, 0
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}
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func rdata_aaaa(hdr RR_Header, tok *token) RR {
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rr := new(RR_AAAA)
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rr.Hdr = hdr
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rr.Hdr.Rrtype = TypeAAAA
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rr.AAAA = net.ParseIP(tok.T[0])
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println("Calling aaaa", tok.T[0])
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return rr
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}
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func rdata_a(hdr RR_Header, tok *token) RR {
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rr := new(RR_A)
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rr.Hdr = hdr
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rr.Hdr.Rrtype = TypeA
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rr.A = net.ParseIP(tok.T[0])
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return rr
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}
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func rdata_ns(hdr RR_Header, tok *token) RR {
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rr := new(RR_NS)
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rr.Hdr = hdr
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rr.Hdr.Rrtype = TypeNS
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rr.Ns = tok.T[0]
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return rr
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}
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func rdata_cname(hdr RR_Header, tok *token) RR {
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rr := new(RR_CNAME)
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rr.Hdr = hdr
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rr.Hdr.Rrtype = TypeCNAME
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rr.Cname = tok.T[0]
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return rr
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}
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func rdata_soa(hdr RR_Header, tok *token) RR {
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rr := new(RR_SOA)
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rr.Hdr = hdr
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rr.Hdr.Rrtype = TypeSOA
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rr.Ns = tok.T[0]
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rr.Mbox = tok.T[1]
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rr.Serial = uint32(tok.N[0])
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rr.Refresh = uint32(tok.N[1])
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rr.Retry = uint32(tok.N[2])
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rr.Expire = uint32(tok.N[3])
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rr.Minttl = uint32(tok.N[4])
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return rr
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}
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func rdata_mx(hdr RR_Header, tok *token) RR {
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rr := new(RR_MX)
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rr.Hdr = hdr;
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rr.Hdr.Rrtype = TypeMX
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rr.Pref = uint16(tok.N[0])
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rr.Mx = tok.T[0]
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return rr
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}
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func rdata_ds(hdr RR_Header, tok *token) RR {
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rr := new(RR_DS)
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rr.Hdr = hdr;
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rr.Hdr.Rrtype = TypeDS
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rr.KeyTag = uint16(tok.N[0])
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rr.Algorithm = uint8(tok.N[1])
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rr.DigestType = uint8(tok.N[2])
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rr.Digest = tok.T[0]
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return rr
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}
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func rdata_dnskey(hdr RR_Header, tok *token) RR {
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rr := new(RR_DNSKEY)
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rr.Hdr = hdr;
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rr.Hdr.Rrtype = TypeDNSKEY
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rr.Flags = uint16(tok.N[0])
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rr.Protocol = uint8(tok.N[1])
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rr.Algorithm = uint8(tok.N[2])
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rr.PublicKey = tok.T[0]
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return rr
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}
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func rdata_rrsig(hdr RR_Header, tok *token) RR {
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rr := new(RR_RRSIG)
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rr.Hdr = hdr;
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rr.Hdr.Rrtype = TypeRRSIG
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rr.TypeCovered = uint16(tok.N[0])
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rr.Algorithm = uint8(tok.N[1])
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rr.Labels = uint8(tok.N[2])
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rr.OrigTtl = uint32(tok.N[3])
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rr.Expiration = uint32(tok.N[4])
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rr.Inception = uint32(tok.N[5])
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rr.KeyTag = uint16(tok.N[6])
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rr.SignerName = tok.T[0]
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rr.Signature = tok.T[1]
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return rr
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}
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func set(r RR, z *Zone, tok *token) {
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z.Push(r)
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tok.reset()
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println("Resetting")
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}
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%%{
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machine z;
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write data;
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}%%
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// SetString
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// All the NewReader stuff is expensive...
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// only works for short io.Readers as we put the whole thing
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// in a string -- needs to be extended for large files (sliding window).
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func Zparse(q io.Reader) (z *Zone, err os.Error) {
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buf := make([]byte, _IOBUF)
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n, err := q.Read(buf)
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if err != nil {
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return nil, err
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}
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buf = buf[:n]
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z = new(Zone)
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data := string(buf)
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cs, p, pe := 0, 0, len(data)
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ts, te, act := 0, 0, 0
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// top := 0
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// stack := make([]int, 100)
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eof := len(data)
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// keep Go happy - need to fix this ofcourse
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ts = ts; te = te; act = act
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brace := false
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lines := 0
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mark := 0
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hdr := new(RR_Header)
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tok := newToken()
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var rr RR
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rr = rr
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%%{
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action mark { mark = p }
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action qname { hdr.Name = data[mark:p] }
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action qclass { hdr.Class = Str_class[data[mark:p]] }
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action defTtl { /* ... */ }
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action setTtl { ttl, _ := strconv.Atoi(data[mark:p]); hdr.Ttl = uint32(ttl) }
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action number { tok.pushInt(data[mark:p]) }
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action text { tok.pushString(data[mark:p]) }
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action openBrace { if brace { println("Brace already open")} ; brace = true }
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action closeBrace { if !brace { println("Brace already closed")}; brace = false }
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action brace { brace }
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action linecount { lines++ }
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# Newlines
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nl = [\n]+ $linecount;
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# Comments, entire line. Shorter comments are handled in the
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# 'bl' definition below.
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comment = ';' [^\n]*;
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bl = (
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[ \t]+
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| '(' $openBrace
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| ')' $closeBrace
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| (comment? nl)+ when brace
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)+ %mark;
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# chars = [^; \t"\n\\)(];
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ws = [ \t]+;
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qclass = ('IN'i|'CS'i|'CH'i|'HS'i|'ANY'i|'NONE'i) %qclass;
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qname = [a-zA-Z0-9_\-.]+ %qname;
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t = [a-zA-Z0-9_\-.:]+ $1 %0 %text;
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tb = [a-zA-Z0-9_\-.: ]+ $1 %0 %text;
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n = [0-9]+ $1 %0 %number;
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ttl = digit+ >mark;
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lhs = qname? bl %defTtl (
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(ttl %setTtl bl (qclass bl)?)
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| (qclass bl (ttl %setTtl bl)?)
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)?;
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main := |*
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lhs 'A'i bl t nl => { rr = rdata_a(*hdr, tok); set(rr, z, tok); };
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lhs 'NS'i bl t nl => { rr = rdata_ns(*hdr, tok); set(rr, z, tok); };
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lhs 'CNAME'i bl t nl => { rr = rdata_cname(*hdr, tok); set(rr, z, tok); };
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lhs 'AAAA'i bl t nl => { rr = rdata_aaaa(*hdr, tok); set(rr, z, tok); };
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lhs 'MX'i bl n bl t nl => { rr = rdata_mx(*hdr, tok); set(rr, z, tok); };
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lhs 'SOA'i bl t bl t bl n bl n bl n bl n bl n nl => { rr = rdata_soa(*hdr, tok); set(rr, z, tok); };
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*|;
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# main := (rr? bl? ((comment? nl) when !brace))*;
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write init;
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write exec;
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}%%
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if eof > -1 {
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if cs < z_first_final {
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// No clue what I'm doing what so ever
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if p == pe {
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println("unexpected eof")
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return z, nil
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} else {
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println("error at position ", p, "\"",data[mark:p],"\"")
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return z, nil
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}
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}
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}
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return z, nil
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}
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