How to receive data from server using PHP socket - php

I am having a hard time getting data from the server. Basically server waits for a connection from anyone using correct username and password. So when I use that using local explorer it shows the data on the browser.
Now what I was trying to do is, get this data using socket and forward it to another server address. But I could not even connect to the server to get the data like I get on the browser. Here is what I have tried:
$host = "192.168.1.4/online?user=dneb&pass=mella88";
$port = 1850;
// don't timeout!
set_time_limit(0);
// create socket
$socket = socket_create(AF_INET, SOCK_STREAM, SOL_TCP) or die("Could not create socket\n");
// bind socket to port
$result = socket_bind($socket, $host, $port) or die("Could not bind to socket\n");
// start listening for connections
$result = socket_listen($socket, 3) or die("Could not set up socket listener\n");
// accept incoming connections
// spawn another socket to handle communication
$spawn = socket_accept($socket) or die("Could not accept incoming connection\n");
// read client input
$input = socket_read($spawn, 1024) or die("Could not read input\n");
// clean up input string
$input = trim($input);
echo "server Message : ".$input;
When I run this code I get warning message:
Warning: socket_bind(): Host lookup failed [11004]: The requested name is valid, but no data of the requested type was found. in C:\xampp\htdocs\socket\client.php on line 10
Could not bind to socket
Or suggest other methods to use.

When you create a socket server, you don't specify the host as the full URL to your script; that's why the bind is failing.
Take a look at this sample: http://www.php.net/manual/en/sockets.examples.php
please try changing
$host = "192.168.1.4";

Related

Php server socket receiving continuous data from python client socket

I am trying to send data continously from the python client socket to the php server socket, I've been able to send data once and print it out. But if I put the server in a while loop to keep listening, the data it gets isn't printed out anymore. It still responds to the client if I send something back to it.
Python client code (this will be put in a function that gets called every time I send something):
import socket
import sys
def main():
host = 'localhost'
port = 5003 # The same port as used by the server
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
print >> sys.stderr, 'connecting to %s port %s' % (host, port)
s.connect((host, port))
s.sendall("Hello! Heartbeat 40!")
data = s.recv(1024)
s.close()
print('Received', repr(data))
if __name__ == "__main__":
main()
Php server code:
<!DOCTYPE html>
<html>
<body>
<?php
// set some variables
$host = "127.0.0.1";
$port = 5003;
// don't timeout!
set_time_limit(0);
// create socket
$socket = socket_create(AF_INET, SOCK_STREAM, 0) or die("Could not create socket\n");
// bind socket to port
$result = socket_bind($socket, $host, $port) or die("Could not bind to socket\n");
// start listening for connections
$result = socket_listen($socket, 3) or die("Could not set up socket listener\n");
while(true){
// accept incoming connections
// spawn another socket to handle communication
$spawn = socket_accept($socket) or die("Could not accept incoming connection\n");
// read client input
$input = socket_read($spawn, 1024) or die("Could not read input\n");
// clean up input string
$input = trim($input);
echo "Client Message : ".$input;
// socket_close($spawn);
}
socket_close($socket);
?>
</body>
</html>
PHP output is not being send to the browser immediately. Httpd server waits for php script to finish, then send the whole output to the client.
while(true){ in your php script runs indefinitely until dies on socket_accept, socket_read, or by timeout.
You need to define an exit point in your loop to eventually stop the script and send data to the browser.

Host a PHP Socket server program in AWS

My requirement is to host a php socket server script in AWS EC2. and communicate to that socket server. This is what I have done so far but its not working.
server.php script that acts a socket server and listens to clients:
<?php
// set some variables
$host = "127.0.0.1";
$port = 53;
// don't timeout!
set_time_limit(0);
// create socket
$socket = socket_create(AF_INET, SOCK_STREAM, 0) or die("Could not create socket\n");
// bind socket to port
$result = socket_bind($socket, $host, $port) or die("Could not bind to socket\n");
// start listening for connections
$result = socket_listen($socket, 3) or die("Could not set up socket listener\n");
// accept incoming connections
// spawn another socket to handle communication
$spawn = socket_accept($socket) or die("Could not accept incoming connection\n");
// read client input
$input = socket_read($spawn, 1024) or die("Could not read input\n");
// clean up input string
$input = trim($input);
echo "Client Message : ".$input;
// reverse client input and send back
$output = strrev($input) . "\n";
socket_write($spawn, $output, strlen ($output)) or die("Could not write output\n");
// close sockets
socket_close($spawn);
socket_close($socket);
In AWS security group, I have added following Inbound rule:
I run the server,php script from SSH using command "php server.php".
I tried to connect to the server from SocketTest tool where I entered following
value
host: 52.xx.xx.xxx (masked the actual value here) and port: 53
I am not able to connect to the socket server. It would be really helpful if someone can guide me if I am missing anything here
Please note that same server.php program is working fine when tested in local xampp server
You have used '127.0.0.1' as host in server script.
You have to replace it with your server's private IP address.

what is socket in php? And at what condition i should go for socket connection?

I have already gone through some tutorials for socket but i couldn't get what it does. I want to know what sockets do and why is it used. This is the code I have referred.
client.php
<?php
$host = "localhost";
$port = 1024;
$message = "Hello Server";
echo "Message To server :".$message;
// create socket
$socket = socket_create(AF_INET, SOCK_STREAM, 0) or die("Could not create socket\n");
// connect to server
$result = socket_connect($socket, $host, $port) or die("Could not connect to server\n");
// send string to server
socket_write($socket, $message, strlen($message)) or die("Could not send data to server\n");
// get server response
$result = socket_read ($socket, 1024) or die("Could not read server response\n");
echo "Reply From Server :".$result;
// close socket
socket_close($socket);
?>
server.php
<?php
// set some variables
$host = "localhost";
$port = 1024;
// don't timeout!
set_time_limit(0);
// create socket
$socket = socket_create(AF_INET, SOCK_STREAM, 0) or die("Could not create socket\n");
// bind socket to port
$result = socket_bind($socket, $host, $port) or die("Could not bind to socket\n");
// start listening for connections
$result = socket_listen($socket, 3) or die("Could not set up socket listener\n");
// accept incoming connections
// spawn another socket to handle communication
$spawn = socket_accept($socket) or die("Could not accept incoming connection\n");
// read client input
$input = socket_read($spawn, 1024) or die("Could not read input\n");
// clean up input string
$input = trim($input);
echo "Client Message : ".$input;
// reverse client input and send back
$output = strrev($input) . "\n";
socket_write($spawn, $output, strlen ($output)) or die("Could not write output\n");
// close sockets
socket_close($spawn);
socket_close($socket);
?>
So I couldn't get the idea of where to enter the server code and client code. Usually we write server code on what it should do while getting user input.So i am extremely confused about this. Can anyone help me? Thanks in advance
In order to understand sockets I think it's important to understand networking principles. Especially the Internet Protocol and Transmission Control Protocol.
The Transmission Control Protocol is a way of breaking up a message into smaller chunks, and addressing them in such a way that the chunks can be reliably re-assembled at the receiving end. The Internet Protocol is a way of routing these chunks through the Internet.
A Socket is just a programming object that manages the details of these protocols for you. You configure the socket to connect to a given port on a given IP address. The socket manages the rest: chunking, packaging, and labeling the data. The socket encapsulates all the protocol details so that you can abstract them away and act as if you are creating a "connection" from one computer to another. As a developer, you use sockets when you need to exchange information with another computer over the Internet.
For me, the idea of a socket and what it might be used for didn't make sense until I studied computer networking. (Especially the protocols themselves, not necessarily the practical, technician side of things.) You can start with the Wikipedia articles on TCP and IP. And you can try to read individual, piecemeal articles on the web. But frankly, networking is such a huge topic that I don't think anything short of a cohesive, semester-long course or a quality textbook would be enough to truly answer this question (and to correct the gaps, oversimplifications, and exceptions that I used to keep this answer simple.)
You need to understand the concept of socket programming. To get a better idea.
Sockets are used for interprocess communication. Interprocess
communication is generally based on client-server model. In this case,
client-server are the applications that interact with each other.
Interaction between client and server requires a connection. Socket
programming is responsible for establishing that connection between
applications to interact.
Client application sends message($message) to server($host) and the
server application receives it from the client through a port($port).
The client.php runs and sends the message from a client machine. The server.php runs on the server machine which receives the message.
Try these links for examples and how to run the server and client files.
http://www.binarytides.com/php-socket-programming-tutorial/
http://www.devshed.com/c/a/php/socket-programming-with-php/

php sockets - listen on the "internet"?

Using the example from http://www.codeproject.com/Tips/418814/Socket-Programming-in-PHP
SERVER.PHP:
// set some variables
$host = "127.0.0.1";
$port = 25003;
// don't timeout!
set_time_limit(0);
// create socket
$socket = socket_create(AF_INET, SOCK_STREAM, 0) or die("Could not create socket\n");
// bind socket to port
$result = socket_bind($socket, $host, $port) or die("Could not bind to socket\n");
// start listening for connections
$result = socket_listen($socket, 3) or die("Could not set up socket listener\n");
// accept incoming connections
// spawn another socket to handle communication
$spawn = socket_accept($socket) or die("Could not accept incoming connection\n");
// read client input
$input = socket_read($spawn, 1024) or die("Could not read input\n");
// clean up input string
$input = trim($input);
echo "Client Message : ".$input;
// reverse client input and send back
$output = strrev($input) . "\n";
socket_write($spawn, $output, strlen ($output)) or die("Could not write output\n");
// close sockets
socket_close($spawn);
socket_close($socket);
CLIENT.PHP:
$host = "127.0.0.1";
$port = 25003;
$message = "Hello Server";
echo "Message To server :".$message;
// create socket
$socket = socket_create(AF_INET, SOCK_STREAM, 0) or die("Could not create socket\n");
// connect to server
$result = socket_connect($socket, $host, $port) or die("Could not connect to server\n");
// send string to server
socket_write($socket, $message, strlen($message)) or die("Could not send data to server\n");
// get server response
$result = socket_read ($socket, 1024) or die("Could not read server response\n");
echo "Reply From Server :".$result;
// close socket
socket_close($socket);
As you can see, the server is listening on 127.0.0.1:port and client is connecting to 127.0.0.1:port
However, I want my client and server to be on two different servers.
For example:
My server will listen be on IP 11.22.33.44:1234 and my client will be connecting from IP 12.23.45.66:1234
I am going to be using linux servers, but right now I am doing this on my windows machine.
So I want to listen on my external IP.
When I enter my external IP as host, I get errors thrown.
Warning: socket_bind(): unable to bind address [10049]: The requested address is not valid in its context. in C:\xampp\htdocs\server.php on line 12
Warning: socket_listen(): unable to listen on socket [10022]: An invalid argument was supplied. in C:\xampp\htdocs\server.php on line 14
Warning: socket_accept(): unable to accept incoming connection [10022]: An invalid argument was supplied. in C:\xampp\htdocs\server.php on line 17
Warning: socket_read() expects parameter 1 to be resource, boolean given in C:\xampp\htdocs\server.php on line 18
Warning: socket_write() expects paramet
er 1 to be resource, boolean given in C:\xampp\htdocs\server.php on line 20
How can I do this?
Thanks.
Since you're (speculation!) probably hosting this service behind a proxy, router, firewall, or other perimeter device, your box won't have direct access to bind to the external IP. Therefore, leave it bound to localhost and forward (open) the applicable ports from the perimeter device to your server.
If, for example, you're using AWS to host, you would set the firewall ACL to permit your socket ports to both servers and then the connections should flow through.
This is akin to binding your Apache web services to the localhost IP address of the server.
Alternatively, if you're not hosting this and communication is happening on a local network, then you should be able to at least bind to the assigned/internal IP address of each local network card.
open cmd and write that
php -f C:\xampp\htdocs\server.php
your code

php socket connections

i'm trying to make a php tcp/ip server with the following code:
<?php
// set some variables
$host = "localhost";
$port = 3804;
// don't timeout!
set_time_limit(0);
// create socket
$socket = socket_create(AF_INET, SOCK_STREAM, 0) or die("Could not create socket\n");
// bind socket to port
$result = socket_bind($socket, $host, $port) or die("Could not bind to socket\n");
// start listening for connections
$result = socket_listen($socket, 3) or die("Could not set up socket listener\n");
// accept incoming connections
// spawn another socket to handle communication
$spawn = socket_accept($socket) or die("Could not accept incoming connection\n");
// read client input
$input = socket_read($spawn, 1024) or die("Could not read input\n");
// clean up input string
$input = trim($input);
// reverse client input and send back
$output = strrev($input) . "\n";
socket_write($spawn, $output, strlen ($output)) or die("Could not write output\n");
// close sockets
socket_close($spawn);
socket_close($socket);
?>
i've randomly choose to work on the 3804 port and when i'm trying to telnet to my host on that port i'm not able to make a connection.. is there any more settings i need to make in the server that the php scripts hosted in, in order to allow my php script to listen to that port ?
Since you pass "localhost" as the second parameter of socket_bind, your socket will only listen to connections from the address localhost resolves to, typically 127.0.0.1. Set $host = '0.0.0.0'; to allow connections from everywhere.
You may also want to configure your firewall(s) to let through connections to port 3804.
That code works for me. Are you running this code from apache or another web server? Have you tried running those lines with php -a?

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