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handle labels with 8-bit byte values in dn_skipname

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The original logic considered each byte until it either found a 0
value or a value >= 192. This means if a string segment contained any
byte >= 192 it was interepretted as a compressed segment marker even
if it wasn't in a position where it should be interpretted as such.

The fix is to adjust dn_skipname to increment by each segments size
rather than look at each character. This avoids misinterpretting
string segment characters by not considering those bytes.
This commit is contained in:
Ryan Fairfax 2019-03-07 13:20:54 -08:00 committed by Rich Felker
parent 4b125dd408
commit 2a0ff45b36
1 changed files with 5 additions and 2 deletions
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7
src/network/dn_skipname.c
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@ -2,11 +2,14 @@
int dn_skipname(const unsigned char *s, const unsigned char *end)
{
const unsigned char *p;
for (p=s; p<end; p++)
const unsigned char *p = s;
while (p < end)
if (!*p) return p-s+1;
else if (*p>=192)
if (p+1<end) return p-s+2;
else break;
else
if (end-p<*p+1) break;
else p += *p + 1;
return -1;
}