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Handle label ending in an escaped dot in PackDomain

This commit is contained in:
Andrew Tunnell-Jones 2014-02-15 00:40:53 +00:00
parent 158454ada4
commit 4bf3023c78
1 changed files with 4 additions and 2 deletions
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6
msg.go
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@ -255,7 +255,7 @@ func packDomainName(s string, msg []byte, off int, compression map[string]int, c
// Emit sequence of counted strings, chopping at dots.
begin := 0
bs := []byte(s)
ro_bs, bs_fresh := s, true
ro_bs, bs_fresh, escaped_dot := s, true, false
for i := 0; i < ls; i++ {
if bs[i] == '\\' {
for j := i; j < ls-1; j++ {
@ -275,12 +275,13 @@ func packDomainName(s string, msg []byte, off int, compression map[string]int, c
}
ls -= 2
}
escaped_dot = bs[i] == '.'
bs_fresh = false
continue
}
if bs[i] == '.' {
if i > 0 && bs[i-1] == '.' {
if i > 0 && bs[i-1] == '.' && !escaped_dot {
// two dots back to back is not legal
return lenmsg, labels, ErrRdata
}
@ -334,6 +335,7 @@ func packDomainName(s string, msg []byte, off int, compression map[string]int, c
labels++
begin = i + 1
}
escaped_dot = false
}
// Root label is special
if len(bs) == 1 && bs[0] == '.' {