/// <summary>
/// Browse service names or types
/// </summary>
static async Task <IEnumerable <DnsServiceEntry> > ResolveServiceAsync(DnsServiceRecord record,
int period, bool fromCache)
{
Console.WriteLine($"Resolving {record} for {period} ms...");
var entries = new HashSet <DnsServiceEntry>();
var cts = new CancellationTokenSource(period);
try {
using (var browser = await Dns.BrowseAsync(record, fromCache, cts.Token)) {
cts.Token.ThrowIfCancellationRequested();
while (await browser.MoveNextAsync(cts.Token))
{
cts.Token.ThrowIfCancellationRequested();
Console.WriteLine($"{DateTime.Now}: {browser.Current}");
entries.Add(browser.Current);
}
}
}
catch (OperationCanceledException) { }
return(entries);
}
/// <summary>
/// Main program entry point
/// </summary>
static void Main(string[] args)
{
Op op = Op.None;
bool cache = false;
int period = 60 * 1000;
DnsServiceRecord record = null;
ProxySocketAddress address = null;
// Parse command line
try {
for (int i = 0; i < args.Length; i++)
{
switch (args[i])
{
case "-a":
case "--all":
if (op != Op.None)
{
throw new ArgumentException("Operations are mutual exclusive");
}
op = Op.All;
break;
case "-s":
case "--services":
i++;
if (op != Op.None)
{
throw new ArgumentException("Operations are mutual exclusive");
}
op = Op.Browse;
if (i < args.Length)
{
record = DnsServiceRecord.Parse(args[i]);
}
break;
case "-t":
case "--timeout":
i++;
if (i >= args.Length || !int.TryParse(args[i], out period))
{
throw new ArgumentException($"Bad -t arg");
}
break;
case "-r":
case "--resolve":
i++;
if (op != Op.None)
{
throw new ArgumentException("Operations are mutual exclusive");
}
op = Op.Resolve;
if (i < args.Length)
{
address = ProxySocketAddress.Parse(args[i]);
}
break;
case "-d":
case "--dir":
i++;
if (op != Op.None)
{
throw new ArgumentException("Operations are mutual exclusive");
}
op = Op.Dir;
if (i < args.Length)
{
address = ProxySocketAddress.Parse(args[i]);
}
break;
case "--fs":
if (op != Op.None)
{
throw new ArgumentException("Operations are mutual exclusive");
}
op = Op.Fs;
break;
case "--use-cache":
cache = true;
break;
case "-R":
case "--relay":
Socket.Provider = Provider.RelayProvider.CreateAsync().Result;
break;
case "-?":
case "-h":
case "--help":
throw new ArgumentException("Help");
default:
throw new ArgumentException($"Unknown {args[i]}");
}
}
}
catch (Exception e) {
Console.WriteLine(e.Message);
Console.WriteLine(
@"
Browser - Proxy .net browser sample.
usage: Browser [options] operation [args]
Options:
-t
--timeout
Timeout in ms to use for each browse request.
--use-cache
Return data from cache only (meaning depends on operation).
--relay
-R Use relay provider instead of default provider.
--help
-?
-h Prints out this help.
Operations (Mutually exclusive):
-s
--services
Without further argument browses all domains. Otherwise
browses for service types or service names in a domain.
If service name is provided, resolves to host:port and txt.
-a
--all Browse all services in all domains on all proxies and
resolve each one. (default!)
-r
--resolve
Resolve host to address (getaddrbyhost) or address to host
(gethostbyaddr) on all proxies.
-d
--dir Browse a folder on any proxy.
--fs Browse entire file system on all proxies recursively.
"
);
return;
}
if (op == Op.Browse)
{
if (record != null)
{
if (string.IsNullOrEmpty(record.Name))
{
var entries = BrowseServicesAsync(
record.Type, record.Domain, period, cache).Result;
}
else
{
var entries = ResolveServiceAsync(
record, period, cache).Result;
}
}
else
{
var entries = BrowseDomainsAsync(period).Result;
Console.WriteLine($"{entries.Count} entries found!!!");
}
}
else if (op == Op.Resolve)
{
var entries = ResolveAddressAsync(address, period, cache).Result;
}
else if (op == Op.Dir)
{
var files = BrowseFilesAsync(null, address?.Host, period, cache).Result;
Console.WriteLine($"{files.Count} files/folders found!!!");
}
else if (op == Op.Fs)
{
BrowseFilesRecursiveAsync(null, null, period, cache).Wait();
}
else if (op == Op.All || op == Op.None)
{
Console.WriteLine("Browse and resolve all services");
var entries = ResolveServiceNamesAsync(period).Result;
Console.WriteLine($"{entries.Count} entries resolved!!!");
}
Console.WriteLine("Press a key to exit...");
Console.ReadKey();
}
