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Truncated #5
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Truncated #5
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Original file line number | Diff line number | Diff line change |
---|---|---|
|
@@ -348,36 +348,40 @@ Query: | |
} | ||
r, rtt, e := c.Exchange(m, nameserver) | ||
Redo: | ||
if e != nil { | ||
switch e { | ||
case nil: | ||
//do nothing | ||
case dns.ErrTruncated: | ||
if *fallback { | ||
if !*dnssec { | ||
fmt.Printf(";; Truncated, trying %d bytes bufsize\n", dns.DefaultMsgSize) | ||
o := new(dns.OPT) | ||
o.Hdr.Name = "." | ||
o.Hdr.Rrtype = dns.TypeOPT | ||
o.SetUDPSize(dns.DefaultMsgSize) | ||
m.Extra = append(m.Extra, o) | ||
r, rtt, e = c.Exchange(m, nameserver) | ||
*dnssec = true | ||
goto Redo | ||
} else { | ||
// First EDNS, then TCP | ||
fmt.Printf(";; Truncated, trying TCP\n") | ||
c.Net = "tcp" | ||
r, rtt, e = c.Exchange(m, nameserver) | ||
*fallback = false | ||
goto Redo | ||
There was a problem hiding this comment. Choose a reason for hiding this commentThe reason will be displayed to describe this comment to others. Learn more. set *fallback false and output "Truncated", this is OK~ |
||
} | ||
} | ||
fmt.Printf(";; Truncated\n") | ||
default: | ||
fmt.Printf(";; %s\n", e.Error()) | ||
continue | ||
} | ||
if r.Id != m.Id { | ||
fmt.Fprintf(os.Stderr, "Id mismatch\n") | ||
return | ||
} | ||
if r.MsgHdr.Truncated && *fallback { | ||
if !*dnssec { | ||
fmt.Printf(";; Truncated, trying %d bytes bufsize\n", dns.DefaultMsgSize) | ||
o := new(dns.OPT) | ||
o.Hdr.Name = "." | ||
o.Hdr.Rrtype = dns.TypeOPT | ||
o.SetUDPSize(dns.DefaultMsgSize) | ||
m.Extra = append(m.Extra, o) | ||
r, rtt, e = c.Exchange(m, nameserver) | ||
*dnssec = true | ||
goto Redo | ||
} else { | ||
// First EDNS, then TCP | ||
fmt.Printf(";; Truncated, trying TCP\n") | ||
c.Net = "tcp" | ||
r, rtt, e = c.Exchange(m, nameserver) | ||
goto Redo | ||
} | ||
} | ||
if r.MsgHdr.Truncated && !*fallback { | ||
fmt.Printf(";; Truncated\n") | ||
} | ||
|
||
if *check { | ||
sigCheck(r, nameserver, *tcp) | ||
denialCheck(r) | ||
|
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hmmm, we should also quit if the tcp query also comes back truncated? If not we enter an infinite loop
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hmm, by tcp, the msg will cut into slices, so do we should consider about this case? Maybe I am wrong, if so, I am really sorry~
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No, when you get a truncated TCP message there is no follow up, the client should then just give up.
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hmm, you mean the server may truncate the tcp msg, I will change the code