int
res_hnok(
const char *dn
)
{
int ppch = '\0', pch = PERIOD, ch = *dn++;
while (ch != '\0') {
int nch = *dn++;
if (periodchar(ch)) {
(void)NULL;
} else if (periodchar(pch)) {
if (!borderchar(ch))
return (0);
} else if (periodchar(nch) || nch == '\0') {
if (!borderchar(ch))
return (0);
} else {
if (!middlechar(ch))
return (0);
}
ppch = pch, pch = ch, ch = nch;
}
return (1);
}
isc_boolean_t
dns_name_ismailbox(const dns_name_t *name) {
unsigned char *ndata, ch;
unsigned int n;
isc_boolean_t first;
REQUIRE(VALID_NAME(name));
REQUIRE(name->labels > 0);
REQUIRE(name->attributes & DNS_NAMEATTR_ABSOLUTE);
/*
* Root label.
*/
if (name->length == 1)
return (ISC_TRUE);
ndata = name->ndata;
n = *ndata++;
INSIST(n <= 63);
while (n--) {
ch = *ndata++;
if (!domainchar(ch))
return (ISC_FALSE);
}
if (ndata == name->ndata + name->length)
return (ISC_FALSE);
/*
* RFC292/RFC1123 hostname.
*/
while (ndata < (name->ndata + name->length)) {
n = *ndata++;
INSIST(n <= 63);
first = ISC_TRUE;
while (n--) {
ch = *ndata++;
if (first || n == 0) {
if (!borderchar(ch))
return (ISC_FALSE);
} else {
if (!middlechar(ch))
return (ISC_FALSE);
}
first = ISC_FALSE;
}
}
return (ISC_TRUE);
}
isc_boolean_t
dns_name_ishostname(const dns_name_t *name, isc_boolean_t wildcard) {
unsigned char *ndata, ch;
unsigned int n;
isc_boolean_t first;
REQUIRE(VALID_NAME(name));
REQUIRE(name->labels > 0);
REQUIRE(name->attributes & DNS_NAMEATTR_ABSOLUTE);
/*
* Root label.
*/
if (name->length == 1)
return (ISC_TRUE);
/*
* Skip wildcard if this is a ownername.
*/
ndata = name->ndata;
if (wildcard && ndata[0] == 1 && ndata[1] == '*')
ndata += 2;
/*
* RFC292/RFC1123 hostname.
*/
while (ndata < (name->ndata + name->length)) {
n = *ndata++;
INSIST(n <= 63);
first = ISC_TRUE;
while (n--) {
ch = *ndata++;
if (first || n == 0) {
if (!borderchar(ch))
return (ISC_FALSE);
} else {
if (!middlechar(ch))
return (ISC_FALSE);
}
first = ISC_FALSE;
}
}
return (ISC_TRUE);
}