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shared: relax restrictions on valid domain name characters a bit

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Previously, we'd not allow control characters to be embedded in domain
names, even when escaped. Since cloudflare uses \000 however to
implement its synthethic minimally covering NSEC RRs, we should allow
them, as long as they are properly escaped.
This commit is contained in:
Lennart Poettering
2015-12-28 14:46:39 +01:00
parent ea3a892fe3
commit c7feab7647
2 changed files with 12 additions and 8 deletions
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src/shared/dns-domain.c
+9 -5
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@@ -98,8 +98,13 @@ int dns_label_unescape(const char **name, char *dest, size_t sz) {
((unsigned) (n[1] - '0') * 10) +
((unsigned) (n[2] - '0'));
/* Don't allow CC characters or anything that doesn't fit in 8bit */
if (k < ' ' || k > 255 || k == 127)
/* Don't allow anything that doesn't
* fit in 8bit. Note that we do allow
* control characters, as some servers
* (e.g. cloudflare) are happy to
* generate labels with them
* inside. */
if (k > 255)
return -EINVAL;
if (d)
@@ -245,7 +250,7 @@ int dns_label_escape(const char *p, size_t l, char *dest, size_t sz) {
*(q++) = *p;
sz -= 1;
} else if ((uint8_t) *p >= (uint8_t) ' ' && *p != 127) {
} else {
/* Everything else */
@@ -259,8 +264,7 @@ int dns_label_escape(const char *p, size_t l, char *dest, size_t sz) {
sz -= 4;
} else
return -EINVAL;
}
p++;
l--;