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Code Editor : msg_truncate.go
package dns // Truncate ensures the reply message will fit into the requested buffer // size by removing records that exceed the requested size. // // It will first check if the reply fits without compression and then with // compression. If it won't fit with compression, Truncate then walks the // record adding as many records as possible without exceeding the // requested buffer size. // // If the message fits within the requested size without compression, // Truncate will set the message's Compress attribute to false. It is // the caller's responsibility to set it back to true if they wish to // compress the payload regardless of size. // // The TC bit will be set if any records were excluded from the message. // If the TC bit is already set on the message it will be retained. // TC indicates that the client should retry over TCP. // // According to RFC 2181, the TC bit should only be set if not all of the // "required" RRs can be included in the response. Unfortunately, we have // no way of knowing which RRs are required so we set the TC bit if any RR // had to be omitted from the response. // // The appropriate buffer size can be retrieved from the requests OPT // record, if present, and is transport specific otherwise. dns.MinMsgSize // should be used for UDP requests without an OPT record, and // dns.MaxMsgSize for TCP requests without an OPT record. func (dns *Msg) Truncate(size int) { if dns.IsTsig() != nil { // To simplify this implementation, we don't perform // truncation on responses with a TSIG record. return } // RFC 6891 mandates that the payload size in an OPT record // less than 512 (MinMsgSize) bytes must be treated as equal to 512 bytes. // // For ease of use, we impose that restriction here. if size < MinMsgSize { size = MinMsgSize } l := msgLenWithCompressionMap(dns, nil) // uncompressed length if l <= size { // Don't waste effort compressing this message. dns.Compress = false return } dns.Compress = true edns0 := dns.popEdns0() if edns0 != nil { // Account for the OPT record that gets added at the end, // by subtracting that length from our budget. // // The EDNS(0) OPT record must have the root domain and // it's length is thus unaffected by compression. size -= Len(edns0) } compression := make(map[string]struct{}) l = headerSize for _, r := range dns.Question { l += r.len(l, compression) } var numAnswer int if l < size { l, numAnswer = truncateLoop(dns.Answer, size, l, compression) } var numNS int if l < size { l, numNS = truncateLoop(dns.Ns, size, l, compression) } var numExtra int if l < size { _, numExtra = truncateLoop(dns.Extra, size, l, compression) } // See the function documentation for when we set this. dns.Truncated = dns.Truncated || len(dns.Answer) > numAnswer || len(dns.Ns) > numNS || len(dns.Extra) > numExtra dns.Answer = dns.Answer[:numAnswer] dns.Ns = dns.Ns[:numNS] dns.Extra = dns.Extra[:numExtra] if edns0 != nil { // Add the OPT record back onto the additional section. dns.Extra = append(dns.Extra, edns0) } } func truncateLoop(rrs []RR, size, l int, compression map[string]struct{}) (int, int) { for i, r := range rrs { if r == nil { continue } l += r.len(l, compression) if l > size { // Return size, rather than l prior to this record, // to prevent any further records being added. return size, i } if l == size { return l, i + 1 } } return l, len(rrs) }
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