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Add dns_name_isdnssvcb

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dns_name_isdnssvcb looks for a name which starts with the label
_dns or _<port>._dns labels.
This commit is contained in:
Mark Andrews 2022-10-05 17:09:33 +11:00
parent f8a741c104
commit f1043f19dd
2 changed files with 62 additions and 1 deletions
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9
lib/dns/include/dns/name.h
View file

@ -1298,10 +1298,17 @@ dns_name_isula(const dns_name_t *owner);
bool
dns_name_istat(const dns_name_t *name);
/*
/*%<
* Determine if 'name' is a potential 'trust-anchor-telemetry' name.
*/
bool
dns_name_isdnssvcb(const dns_name_t *name);
/*%<
* Determine if 'name' is a dns service name,
* i.e. it starts with and optional _port label followed by a _dns label.
*/
ISC_LANG_ENDDECLS
/*

54
lib/dns/name.c
View file

@ -2376,3 +2376,57 @@ dns_name_istat(const dns_name_t *name) {
}
return (true);
}
bool
dns_name_isdnssvcb(const dns_name_t *name) {
unsigned char len, len1;
const unsigned char *ndata;
REQUIRE(VALID_NAME(name));
if (name->labels < 1 || name->length < 5) {
return (false);
}
ndata = name->ndata;
len = len1 = ndata[0];
INSIST(len <= name->length);
ndata++;
if (len < 2 || ndata[0] != '_') {
return (false);
}
if (isdigit(ndata[1]) && name->labels > 1) {
char buf[sizeof("65000")];
long port;
char *endp;
/*
* Do we have a valid _port label?
*/
if (len > 6U || (ndata[1] == '0' && len != 2)) {
return (false);
}
memcpy(buf, ndata + 1, len - 1);
buf[len - 1] = 0;
port = strtol(buf, &endp, 10);
if (*endp != 0 || port < 0 || port > 0xffff) {
return (false);
}
/*
* Move to next label.
*/
ndata += len;
INSIST(len1 + 1U < name->length);
len = *ndata;
INSIST(len + len1 + 1U <= name->length);
ndata++;
}
if (len == 4U && strncasecmp((const char *)ndata, "_dns", 4) == 0) {
return (true);
}
return (false);
}