public void ShouldResolveExactMatchWithAlias()
{
string testExpectedHostname = "example.com";
string testalias = "IIS1";
string testExpectedResult = "iis1.example.com";
DnsRuleGroup group = new DnsRuleGroup();
group.AddRule(new DnsRule
{
Hostnames = new[] { (Hostname)testExpectedHostname },
RecordType = DnsRecordType.CNAME,
ValueAlias = testalias
});
DnsValueAlias alias = new DnsValueAlias { Name = testalias, Value = testExpectedResult };
RuleResolver resolver = new RuleResolver(new DnsRuleGroup[] { group },
new DnsValueAlias[] { alias });
QueryResult result = resolver.Resolve(new Query
{
QueryType = DnsRecordType.CNAME,
Question = testExpectedHostname
});
Assert.That(result, Is.Not.Null);
Assert.That(result.Result, Is.True);
Assert.That(result.RecordType, Is.EqualTo(DnsRecordType.CNAME));
Assert.That(result.RecordValue, Is.EqualTo(testExpectedResult));
}
public void ShouldResolveMorePreciseHostnameInGroup()
{
string testHostnameMatch = "www.example.com";
string testExpectedResult = "iis3.example.com";
string testHostnameEntry1 = "*.example.com";
string testHostnameReturnValue1 = "iis1.example.com";
string testHostnameEntry2 = testHostnameMatch;
string testHostnameReturnValue2 = testExpectedResult;
DnsRuleGroup group = new DnsRuleGroup();
group.AddRule(new DnsRule
{
Hostnames = new[] { (Hostname)testHostnameEntry1 },
RecordType = DnsRecordType.CNAME,
Value = testHostnameReturnValue1
});
group.AddRule(new DnsRule
{
Hostnames = new[] { (Hostname)testHostnameEntry2 },
RecordType = DnsRecordType.CNAME,
Value = testHostnameReturnValue2
});
RuleResolver resolver = new RuleResolver(new DnsRuleGroup[] { group },
new DnsValueAlias[] { });
QueryResult result = resolver.Resolve(new Query
{
QueryType = DnsRecordType.CNAME,
Question = testHostnameMatch
});
Assert.That(result, Is.Not.Null);
Assert.That(result.Result, Is.True);
Assert.That(result.RecordType, Is.EqualTo(DnsRecordType.CNAME));
Assert.That(result.RecordValue, Is.EqualTo(testExpectedResult));
}
public RuleResolver(DnsRuleGroup[] dnsRuleGroups, DnsValueAlias[] dnsValueAliases)
{
_dnsRuleGroups = dnsRuleGroups ?? new DnsRuleGroup[] { };
_dnsValueAliases = dnsValueAliases ?? new DnsValueAlias[] { };
}
public void ShouldReturnResolveUpstreamForAnyHostMatch()
{
string testHostnameMatch = "www.example.com";
string testHostnameEntry = "*.example.com";
DnsRuleGroup group = new DnsRuleGroup();
group.AddRule(new DnsRule
{
Hostnames = new[] { (Hostname)testHostnameEntry },
RuleType = DnsRuleType.ResolveUpstream
});
RuleResolver resolver = new RuleResolver(new DnsRuleGroup[] { group },
new DnsValueAlias[] { });
QueryResult result = resolver.Resolve(new Query
{
QueryType = DnsRecordType.CNAME,
Question = testHostnameMatch
});
Assert.That(result, Is.Not.Null);
Assert.That(result.Result, Is.True);
Assert.That(result.RuleResult, Is.EqualTo(DnsRuleType.ResolveUpstream));
}
private RuleMatchResult GetRuleMatch(Query query, DnsRuleGroup group)
{
// Examine the group's rules and give a result.
var similarRules = group.Rules
.Select(rule => new
{
HostnameSimilarity = FindHostnameSimilarity(query, rule),
TypeSimilarity = SimilarRuleTypes(query, rule),
Rule = rule
})
.Where(result => result.HostnameSimilarity > 0 && result.TypeSimilarity > 0)
.OrderByDescending(rule => rule.HostnameSimilarity)
.ThenByDescending(rule => rule.TypeSimilarity)
.ToArray();
if (!similarRules.Any())
{
return new RuleMatchResult { Match = false };
}
return
similarRules
.Select(
rule =>
new RuleMatchResult
{
HostnameSimilarity = rule.HostnameSimilarity,
Match = true,
Rule = rule.Rule
})
.FirstOrDefault();
}