diff options
Diffstat (limited to 'vendor/github.com/miekg/dns/dns.go')
-rw-r--r-- | vendor/github.com/miekg/dns/dns.go | 104 |
1 files changed, 104 insertions, 0 deletions
diff --git a/vendor/github.com/miekg/dns/dns.go b/vendor/github.com/miekg/dns/dns.go new file mode 100644 index 000000000..b3292287c --- /dev/null +++ b/vendor/github.com/miekg/dns/dns.go @@ -0,0 +1,104 @@ +package dns + +import "strconv" + +const ( + year68 = 1 << 31 // For RFC1982 (Serial Arithmetic) calculations in 32 bits. + defaultTtl = 3600 // Default internal TTL. + + DefaultMsgSize = 4096 // DefaultMsgSize is the standard default for messages larger than 512 bytes. + MinMsgSize = 512 // MinMsgSize is the minimal size of a DNS packet. + MaxMsgSize = 65535 // MaxMsgSize is the largest possible DNS packet. +) + +// Error represents a DNS error. +type Error struct{ err string } + +func (e *Error) Error() string { + if e == nil { + return "dns: <nil>" + } + return "dns: " + e.err +} + +// An RR represents a resource record. +type RR interface { + // Header returns the header of an resource record. The header contains + // everything up to the rdata. + Header() *RR_Header + // String returns the text representation of the resource record. + String() string + + // copy returns a copy of the RR + copy() RR + // len returns the length (in octets) of the uncompressed RR in wire format. + len() int + // pack packs an RR into wire format. + pack([]byte, int, map[string]int, bool) (int, error) +} + +// RR_Header is the header all DNS resource records share. +type RR_Header struct { + Name string `dns:"cdomain-name"` + Rrtype uint16 + Class uint16 + Ttl uint32 + Rdlength uint16 // Length of data after header. +} + +// Header returns itself. This is here to make RR_Header implements the RR interface. +func (h *RR_Header) Header() *RR_Header { return h } + +// Just to implement the RR interface. +func (h *RR_Header) copy() RR { return nil } + +func (h *RR_Header) copyHeader() *RR_Header { + r := new(RR_Header) + r.Name = h.Name + r.Rrtype = h.Rrtype + r.Class = h.Class + r.Ttl = h.Ttl + r.Rdlength = h.Rdlength + return r +} + +func (h *RR_Header) String() string { + var s string + + if h.Rrtype == TypeOPT { + s = ";" + // and maybe other things + } + + s += sprintName(h.Name) + "\t" + s += strconv.FormatInt(int64(h.Ttl), 10) + "\t" + s += Class(h.Class).String() + "\t" + s += Type(h.Rrtype).String() + "\t" + return s +} + +func (h *RR_Header) len() int { + l := len(h.Name) + 1 + l += 10 // rrtype(2) + class(2) + ttl(4) + rdlength(2) + return l +} + +// ToRFC3597 converts a known RR to the unknown RR representation from RFC 3597. +func (rr *RFC3597) ToRFC3597(r RR) error { + buf := make([]byte, r.len()*2) + off, err := PackRR(r, buf, 0, nil, false) + if err != nil { + return err + } + buf = buf[:off] + if int(r.Header().Rdlength) > off { + return ErrBuf + } + + rfc3597, _, err := unpackRFC3597(*r.Header(), buf, off-int(r.Header().Rdlength)) + if err != nil { + return err + } + *rr = *rfc3597.(*RFC3597) + return nil +} |