I have an ASP.NET application setup in IIS 7 that uses two HTTP bindings on port 80, each with a different IP address.
This web server is behind a load balancer which could forward traffic on to the web server via either of the IP addresses (depending upon circumstances which aren't important).
Is there away for my application to detect which IP was being used by the load balancer - is it simply available via the REMOTE_ADDR server variable in the Request (assuming the load balancer overrides this)?
I think its an F5 load balancer is that helps!
In my case the answer was to use the LOCAL_ADDR variable as this represented the the server address on which the request came in - the load balancer.
Great info on server variables.
Cheers
This will display all of the relevant data: (from http://msdn.microsoft.com/en-us/library/system.web.httprequest.servervariables(v=vs.90).aspx )
int loop1, loop2;
NameValueCollection coll;
// Load ServerVariable collection into NameValueCollection object.
coll=Request.ServerVariables;
// Get names of all keys into a string array.
String[] arr1 = coll.AllKeys;
for (loop1 = 0; loop1 < arr1.Length; loop1++)
{
Response.Write("Key: " + arr1[loop1] + "<br>");
String[] arr2=coll.GetValues(arr1[loop1]);
for (loop2 = 0; loop2 < arr2.Length; loop2++) {
Response.Write("Value " + loop2 + ": " + Server.HtmlEncode(arr2[loop2]) + "<br>");
}
}
Within this you'll find REMOTE_ADDR which references the client, and SERVER_PORT which references the IIS host.
Related
I'm trying to send email from an ASP.NET using my SendGrid account. It works on my dev machine, but not in production, even though the credentials are the same. Likewise, in production I can connect to the SMTP server via telnet (using base64 encoded credentials), but the ASP site can't connect--I get error "Unauthenticated senders not allowed."
I've tried a mix of port numbers (25, 587, 465 -- my site is SSL). Using port 465 times out. 25 and 587 return respond immediately--but with the login error. This is really baffling because, like I say, it's the same credentials on dev machine and production.
I looked very briefly at Microsoft Network Monitor 3.4, but could not make heads or tails of it. I was hoping it would tell me the blow-by-blow commands being sent since I suspect the web site is doing something a little different from how telnet connects, but I don't know what.
Note I also asked my web host if outgoing traffic on these ports were blocked on production firewall, but they aren't.
Here's the actual code--like I say works fine on localhost, but SMTP connection fails in production
[AllowAnonymous]
[HttpPost]
public ActionResult ResetPasswordSend(string email)
{
List<string> userList = new List<string>();
try
{
string[] invalidChars = new string[] { ";", "," };
foreach (var invalidChar in invalidChars) if (email.Contains(invalidChar)) throw new Exception("Email contains invalid character.");
int count = 0;
// since emails are not unique, I must launch resets for all of them
var users = _db.HsProfile.Query("[Email]=#0", SqlDb.Params(email));
foreach (var profile in users)
{
count++;
userList.Add(profile.UserName);
var token = WebSecurity.GeneratePasswordResetToken(profile.UserName, 15);
WebMail.Send(profile.Email, "HumaneSolution.com Password Reset for user " + profile.UserName,
"You received this email because you or someone with your email address requested a password reset on HumaneSolution.com. " +
"If you didn't do this, then you don't need to take any action, and nothing will happen.\n\n" +
"To proceed with the password reset, click the link below within 15 minutes:\n\n" +
Url.BaseUrl("Account/EnterNewPassword/" + token) + "\n\n" +
"Sent to: " + email + " at " + DateTime.Now.ToLongDateString() + " " + DateTime.Now.ToLongTimeString() + "\n" +
"User name: " + profile.UserName);
}
if (count == 0) throw new Exception("Email " + email + " is not registered at HumaneSolution.com.");
}
catch (Exception exc)
{
ViewBag.Error = exc.Message;
}
return View(userList);
}
Based on suggestion from SendGrid, I re-wrote the email code so it does not use WebMail.Send but rather the SmtpClient and MailMessage objects explicitly. SendGrid says there might be some kind of timing problem in how ASP.NET loads credentials from the config file automatically. Here's exactly what they said:
Are you by chance storing your SendGrid credentials in a configuration file, separate from the code that connects to our SMTP server? The reason I ask is because I have seen rails and C# configurations like this receive the unauthenticated error due to the credentials not being passed at the correct time. Usually this is solved by moving the credentials directly in with the code instead of a separate configuration file. Give that a try and see if you notice a difference.<<
I didn't follow their advice completely -- i.e. I'm still using config file, but I'm loading the config values in subclasses of SmtpClient and MailMessage so I avoid hardcoding creds in my app. Anyway, it worked, all is well again.
I would like to get the user IP address in my meteor application, on the server side, so that I can log the IP address with a bunch of things (for example: non-registered users subscribing to a mailing list, or just doing anything important).
I know that the IP address 'seen' by the server can be different than the real source address when there are reverse proxies involved. In such situations, X-Forwarded-For header should be parsed to get the real public IP address of the user. Note that parsing X-Forwarded-For should not be automatic (see http://www.openinfo.co.uk/apache/index.html for a discussion of potential security issues).
External reference: This question came up on the meteor-talk mailing list in august 2012 (no solution offered).
1 - Without a http request, in the functions you should be able to get the clientIP with:
clientIP = this.connection.clientAddress;
//EX: you declare a submitForm function with Meteor.methods and
//you call it from the client with Meteor.call().
//In submitForm function you will have access to the client address as above
2 - With a http request and using iron-router and its Router.map function:
In the action function of the targeted route use:
clientIp = this.request.connection.remoteAddress;
3 - using Meteor.onConnection function:
Meteor.onConnection(function(conn) {
console.log(conn.clientAddress);
});
Similar to the TimDog answer but works with newer versions of Meteor:
var Fiber = Npm.require('fibers');
__meteor_bootstrap__.app
.use(function(req, res, next) {
Fiber(function () {
console.info(req.connection.remoteAddress);
next();
}).run();
});
This needs to be in your top-level server code (not in Meteor.startup)
This answer https://stackoverflow.com/a/22657421/2845061 already does a good job on showing how to get the client IP address.
I just want to note that if your app is served behind proxy servers (usually happens), you will need to set the HTTP_FORWARDED_COUNT environment variable to the number of proxies you are using.
Ref: https://docs.meteor.com/api/connections.html#Meteor-onConnection
You could do this in your server code:
Meteor.userIPMap = [];
__meteor_bootstrap__.app.on("request", function(req, res) {
var uid = Meteor.userId();
if (!uid) uid = "anonymous";
if (!_.any(Meteor.userIPMap, function(m) { m.userid === uid; })) {
Meteor.userIPMap.push({userid: uid, ip: req.connection.remoteAddress });
}
});
You'll then have a Meteor.userIPMap with a map of userids to ip addresses (to accommodate the x-forwarded-for header, use this function inside the above).
Three notes: (1) this will fire whenever there is a request in your app, so I'm not sure what kind of performance hit this will cause; (2) the __meteor_bootstrap__ object is going away soon I think with a forthcoming revamped package system; and (3) the anonymous user needs better handling here..you'll need a way to attach an anonymous user to an IP by a unique, persistent constraint in their request object.
You have to hook into the server sessions and grab the ip of the current user:
Meteor.userIP = function(uid) {
var k, ret, s, ss, _ref, _ref1, _ref2, _ref3;
ret = {};
if (uid != null) {
_ref = Meteor.default_server.sessions;
for (k in _ref) {
ss = _ref[k];
if (ss.userId === uid) {
s = ss;
}
}
if (s) {
ret.forwardedFor = ( _ref1 = s.socket) != null ?
( _ref2 = _ref1.headers) != null ?
_ref2['x-forwarded-for'] : void 0 : void 0;
ret.remoteAddress = ( _ref3 = s.socket) != null ?
_ref3.remoteAddress : void 0;
}
}
return ret.forwardedFor ? ret.forwardedFor : ret.remoteAddress;
};
Of course you will need the current user to be logged in. If you need it for anonymous users as well follow this post I wrote.
P.S. I know it's an old thread but it lacked a full answer or had code that no longer works.
Here's a way that has worked for me to get a client's IP address from anywhere on the server, without using additional packages. Working in Meteor 0.7 and should work in earlier versions as well.
On the client, get the socket URL (unique) and send it to the server. You can view the socket URL in the web console (under Network in Chrome and Safari).
socket_url = Meteor.default_connection._stream.socket._transport.url
Meteor.call('clientIP', socket_url)
Then, on the server, use the client's socket URL to find their IP in Meteor.server.sessions.
sr = socket_url.split('/')
socket_path = "/"+sr[sr.length-4]+"/"+sr[sr.length-3]+"/"+sr[sr.length-2]+"/"+sr[sr.length-1]
_.each(_.values(Meteor.server.sessions), (session) ->
if session.socket.url == socket_path
user_ip = session.socket.remoteAddress
)
user_ip now contains the connected client's IP address.
I am developing a vehicle tracking system which uses GPS/GPRS/GSM. The tracking device I am currently using is GV100, a GPS/GPRS/GSM tracker from Quectel ([www.quectel.com][1].)
I am not able to establish connection between the device and the backend server. My question particularly is:
How do I send commands (AT Commands) to the device from the server?
How do I accept the response (reports and acknowledgement messages) from the device to save it in the database?
I sent command to the device with the MGV100 Manage Tool (Software provided by Quectel) via serial port. And I got acknowledgement SMS message on GSM enabled mobile telephone. Now, I want to send message from the server and accept reply on the server (not by SMS). I don’t know how to send command and receive the reply. I have no previous experience in developing such systems.
It would be great if I can get a sample code and setup procedures if it requires.
Where can I get a relevant tutorial for the case I mentioned?
Thanks jhonkola
To understand how server receives and send data to the device, I decided to first implement the communication between the client (currently my PC) and server. Though my ultimate goal is communicating with the device, currently I am trying to establish connection from my PC to the server. If I succeed in this, I will strive to communicate to server from the device which needs IP address and port number of server to send and receive data.
This is my assumption how to do it:
I can open a port on the server from .cs code so as to communicate
using TCP/UDP.
Client then can send and receive data via this
port.
I can save the data sent from the client on server's file
system and review it any time. (Am not storing the data in relational database because I don't want to bother about database issues now.)
This is how I tried to implement:
Server a C# Web Application:
When a button is clicked it opens a port and listens to client
protected void btnConnect_Click(object sender, EventArgs e)
{
try
{
continueListening = true;
while (continueListening)
{
int port=Int32.Parse(txtPort.Text);
lblOutput.Text = "Port is now " + port +". Waiting for connection";
TcpListener myList = new TcpListener(IPAddress.Parse(txtIpAddress.Text), port);
myList.Start();
Socket s = myList.AcceptSocket();
lblOutput.Text="Connection accepted from " + s.RemoteEndPoint;
byte[] b = new byte[100];
int k = s.Receive(b);
lblOutput.Text = ("Recieved...");
String obtainedText = "";
for (int i = 0; i < k; i++)
{
obtainedText = obtainedText + " " + (Convert.ToChar(b[i]));
}
writeToTextFile("C:/Users/MekAtIbex/Desktop/TESTED/RECIEVED.txt", obtainedText);
lblOutput.Text = obtainedText;
ASCIIEncoding asen = new ASCIIEncoding();
lblOutput.Text = lblOutput.Text +" "+ ("The string was recieved by the server.");
lblOutput.Text = lblOutput.Text +" "+ ("\r\nSent Acknowledgement");
}
Client: C# Windows application
private void btnSend_Click(object sender, EventArgs e)
{
try
{
TcpClient tcpClient = new TcpClient();
int port=Int32.Parse(txtPort.Text.Trim());
tcpClient.Connect(txtIpAddress.Text, port);
lblStatus.Text = ("Connected");
Stream stm = tcpClient.GetStream();
ASCIIEncoding asen = new ASCIIEncoding();
byte[] bytesToSend = asen.GetBytes(txtData.Text);
lblStatus.Text = ("Transmitting.....");
stm.Write(bytesToSend, 0, bytesToSend.Length);
byte[] bb = new byte[100];
int k = stm.Read(bb, 0, 100);
for (int i = 0; i < k; i++)
{
txtaResponse.Text = txtaResponse.Text + "\n" + "Res... " + new DateTime() + " " + Convert.ToChar(bb[i]);
Console.Write(Convert.ToChar(bb[i]));
}
tcpClient.Close();
}
catch (Exception ex)
{
lblStatus.Text = ("Connected");
txtaRequest.Text = txtaRequest.Text + "\n" + "Err... " + new DateTime() + " " + ex.StackTrace;
}
}
My current questions are:
Is my assumption correct? If not how should I do it?
I have tried to save it using the above code but I didn't got the file.
What is the advantage and disadvantage of using UDP in comparison TCP for tracking applications?
I have browsed well, but I couldn't find a place for a good start. And, as I have no experience in such applications, I couldn't debug my application.
My current questions are:
Is my assumption correct? If not how should I do it?
Yes, your basic assumptions are correct. The server would open a listening port and then the client could connect to this port and drop off data as needed. You can have the server log this to a file for later review too.
I have tried to save it using the above code but I didn't got the
file.
Is the file already created? The method you have will fail if the file is not existent on the system.
What is the advantage and disadvantage of using UDP in comparison TCP
for tracking applications?
UPD is less expensive in terms of network setup. It is the "fast and dirty" method of communication. The downside is that you may not get every message properly delivered. In some applications, this just doesn't matter and the benefits are worth this cost.
Now a few things I'd change:
Change IPAddress.Parse(txtIpAddress.Text) to IPAddress.Any
This will allow your listener the broadest ability to catch incoming messages and will most likely not effect other systems (since this is essentially your first networking program).
You'll also want to make your listener spawn a thread to handle the file writing and then go back to listening. This is a very standard practice and allows for servers to handle multiple connections.
It is difficult to comprehensively answer this, as a good answer would require detailed knowledge about the product. I suggest that you contact the manufacturer / reseller for support.
A few general points:
Sending commands over network to the device requires that you are able to connect to the device from internet. This is not always easy over GSM network, as the operators may block all incoming traffic. The manufacturer may have provided solutions for this.
If you can connect to the device, the protocol that is used to give commands (assuming that such protocol is built-in) will also contain a mechanism to receive any responses.
I want to add a host header to a website which is working on IIS7 through a web application (asp.net 4.0 / C#).There are some examples in internet,but i guess most of them dont work on iis7.
(note:the web application is being hosted in same server so i guess there wont be a security problem while changing iis configurations)
Any help is appreciated,thanks
I found this solution and it works for me.This is a little function with couple parameters,just you have to find the id of yourwebsite in your iss configuration.After that you have to give the ip adress of the server (iis),and port number,and hostname to the function and it will add a hostheader by using the parameters you entered.For example
AddHostHeader(2, "127.0.0.1:81", 81, "newsHostHeader");
static void AddHostHeader(int? websiteID, string ipAddress, int? port, string hostname)
{
using (var directoryEntry = new DirectoryEntry("IIS://localhost/w3svc/" + websiteID.ToString()))
{
var bindings = directoryEntry.Properties["ServerBindings"];
var header = string.Format("{0}:{1}:{2}", ipAddress, port, hostname);
if (bindings.Contains(header))
throw new InvalidOperationException("Host Header already exists!");
bindings.Add(header);
directoryEntry.CommitChanges();
}
}
(note:do not forget to add to the page using
System.DirectoryServices; using Microsoft.Web.Administration; )
The above solution didn't quite work with IIS7.5 for me.
I eventually had to do this
http://www.iis.net/configreference/system.applicationhost/sites/site/bindings/binding
How to get to know DNS name of the server where ASP.NET application is run?
I want to get string "www.somehost.com" if my application URL is http://www.somehost.com/somepath/application.aspx
Is there some property of Server, Contex, Session or Request objects for this?
Thanks!
This will get you the DNS IP for the server that is hosting the web site
void GetDNSServerAddress()
{
NetworkInterface[] nics = NetworkInterface.GetAllNetworkInterfaces();
foreach (NetworkInterface ni in nics)
{
if (ni.OperationalStatus == OperationalStatus.Up)
{
IPAddressCollection ips = ni.GetIPProperties().DnsAddresses;
foreach (System.Net.IPAddress ip in ips)
{
Console.Write(ip.ToString());
}
}
}
}
However, while writing this ive just seen your edited post, so i think this is what you are after is simply:
string host = Request.Url.Scheme + "://" + Request.Url.Host;
Hope this helps!
The HTTP_HOST server variable can give you what you need.
Request.ServerVariables("HTTP_HOST")
You can also get the 'machine name' using
System.Environment.MachineName