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Add --no-0x20-encode config option.

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The "bit 0x20 encoding" implemented in 995a16ca0c
can interact badly with (hopefully) rare broken upstream servers. Provide
an option to turn it off and a log message to give a clue as to why DNS service
is non-functional.
This commit is contained in:
Simon Kelley
2025-02-03 21:02:12 +00:00
parent 1f84cde024
commit 5226b712a3
6 changed files with 62 additions and 19 deletions
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15
src/rfc1035.c
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@@ -24,6 +24,7 @@
return = 0 -> error
return = 1 -> extract OK, compare OK, flip OK
return = 2 -> extract OK, compare failed.
return = 3 -> extract OK, compare failed but only on case.
*/
int extract_name(struct dns_header *header, size_t plen, unsigned char **pp,
char *name, int func, unsigned int parm)
@@ -140,9 +141,21 @@ int extract_name(struct dns_header *header, size_t plen, unsigned char **pp,
if (case_insens && c2 >= 'A' && c2 <= 'Z')
c2 += 'a' - 'A';
if (!case_insens && retvalue != 2 && c1 != c2)
{
if (c1 >= 'A' && c1 <= 'Z')
c1 += 'a' - 'A';
if (c2 >= 'A' && c2 <= 'Z')
c2 += 'a' - 'A';
if (c1 == c2)
retvalue = 3;
}
if (c1 != c2)
retvalue = 2;
retvalue = 2;
}
}