This code scans my network 255 D-class segments in about 1 sec. I wrote it in VB.net and translated it to C# (apologies if there are any errors). Paste it into a Console project and run. Modify as needed. Note: The code is not production ready and need improvements on especially the instance counting (try … Read more
something like this should work $url=”yoururl”; $ch = curl_init($url); curl_setopt($ch, CURLOPT_NOBODY, true); curl_setopt($ch, CURLOPT_FOLLOWLOCATION, true); curl_exec($ch); $retcode = curl_getinfo($ch, CURLINFO_HTTP_CODE); curl_close($ch); if (200==$retcode) { // All’s well } else { // not so much }
I think if you just want to ping an url, you can use this code : try { URL url = new URL(“http://” + params[0]); HttpURLConnection urlc = (HttpURLConnection) url.openConnection(); urlc.setRequestProperty(“User-Agent”, “Android Application:”+Z.APP_VERSION); urlc.setRequestProperty(“Connection”, “close”); urlc.setConnectTimeout(1000 * 30); // Timeout is in seconds urlc.connect(); if (urlc.getResponseCode() == 200) { Main.Log(“getResponseCode == 200”); return new Boolean(true); … Read more
Without ping #!/bin/bash wget -q –spider http://google.com if [ $? -eq 0 ]; then echo “Online” else echo “Offline” fi -q : Silence mode –spider : don’t get, just check page availability $? : shell return code 0 : shell “All OK” code Without wget #!/bin/bash echo -e “GET http://google.com HTTP/1.0\n\n” | nc google.com 80 … Read more
It does works for me: To verify network availability: private Boolean isNetworkAvailable() { ConnectivityManager connectivityManager = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE); NetworkInfo activeNetworkInfo = connectivityManager.getActiveNetworkInfo(); return activeNetworkInfo != null && activeNetworkInfo.isConnectedOrConnecting(); } To verify internet access: public Boolean isOnline() { try { Process p1 = java.lang.Runtime.getRuntime().exec(“ping -c 1 www.google.com”); int returnVal = p1.waitFor(); boolean reachable = (returnVal==0); return … Read more
Given that I had to write a TraceRoute class today I figured I might as well share the source code. using System.Collections.Generic; using System.Net.NetworkInformation; using System.Text; using System.Net; namespace Answer { public class TraceRoute { private const string Data = “aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa”; public static IEnumerable<IPAddress> GetTraceRoute(string hostNameOrAddress) { return GetTraceRoute(hostNameOrAddress, 1); } private static IEnumerable<IPAddress> GetTraceRoute(string … Read more
string.Format is your friend. String.Format(“{0:0.00}”, 123.4567); // “123.46”
I think the answer to this question pretty much sums up the problem with your question. If what you want to do is find out whether a given host will accept TCP connections on port 80, you can do this: $host=”193.33.186.70″; $port = 80; $waitTimeoutInSeconds = 1; if($fp = fsockopen($host,$port,$errCode,$errStr,$waitTimeoutInSeconds)){ // It worked } else … Read more
Assuming that it’s a TCP (rather than UDP) port that you’re trying to use: On the server itself, use netstat -an to check to see which ports are listening. From outside, just use telnet host port (or telnet host:port on Unix systems) to see if the connection is refused, accepted, or timeouts. On that latter … Read more
The question was to see if ping responded which this script does. However this will not work if you get the Host Unreachable message as this returns ERRORLEVEL 0 and passes the check for Received = 1 used in this script, returning Link is UP from the script. Host Unreachable occurs when ping was delivered … Read more