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| author | Lennart Poettering <lennart@poettering.net> | 2015-11-29 14:12:05 +0100 |
|---|---|---|
| committer | Lennart Poettering <lennart@poettering.net> | 2015-11-30 19:37:41 +0100 |
| commit | 3b37fa735224e58fcc23c737b764d13e22c2885b (patch) | |
| tree | 45fc4141398824a587a28116506184e5e405bf15 /src/shared/dns-domain.h | |
| parent | bca27e1729b496081b0fa4e2754f5fcdcc0efce5 (diff) | |
dns-domain: be more strict when encoding/decoding labels
Labels of zero length are not OK, refuse them early on. The concept of a
"zero-length label" doesn't exist, a zero-length full domain name
however does (representing the root domain). See RFC 2181, Section 11.
Diffstat (limited to 'src/shared/dns-domain.h')
| -rw-r--r-- | src/shared/dns-domain.h | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/src/shared/dns-domain.h b/src/shared/dns-domain.h index 99c72574db..c68f1945e1 100644 --- a/src/shared/dns-domain.h +++ b/src/shared/dns-domain.h @@ -25,7 +25,10 @@ #include "hashmap.h" #include "in-addr-util.h" +/* Length of a single label, with all escaping removed, excluding any trailing dot or NUL byte */ #define DNS_LABEL_MAX 63 + +/* Worst case length of a single label, with all escaping applied and room for a trailing NUL byte. */ #define DNS_LABEL_ESCAPED_MAX (DNS_LABEL_MAX*4+1) int dns_label_unescape(const char **name, char *dest, size_t sz); |