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Full Discussion: Tcp Ip Server
Top Forums Programming Tcp Ip Server Post 46969 by massimo_ratti on Friday 30th of January 2004 05:04:11 AM
Old 01-30-2004
Question Tcp Ip Server

i am programming a tcp_ip server which intends to listen permanently to a client . the client can disconnect and connect again and the server accept it(by this point it works).The problem is when the client lose connection without a disconnect command and my code can't get it and keeps waiting for some message to come with the read command considering that socket still working. i need it to exit from read command and close the socket in order to accept another one...
I thought to use a separate thread which consider the connection lost if it doesn't read anything from the client for a certain period of time...but it seems strange to me that there's not a prepared function in some tcp library that already does it.
ANY SUGGESTMENTS? THANKS A LOT
Massimo
Here's a piece of the code:

void die(char * message)
{

perror(message);
exit(1);

}

void copyData (int from, int to)
{

while ((len = read(from, buff, sizeof(buff))) > 0)
{
interpreta_messaggio(buff);

}
close(from);

}
void main()
{
struct sockaddr_in address;
int sock, conn, i;
size_t addrLength = sizeof(struct sockaddr_in);

if ((sock = socket(PF_INET,SOCK_STREAM,0)) < 0)
die("socket");

i=1;
setsockopt(sock,SOL_SOCKET,SO_REUSEADDR, &i,sizeof(i));

address.sin_family = AF_INET;
address.sin_port = htons(7000);
memset(&address.sin_addr, 0, sizeof(address.sin_addr));

if (bind(sock, (struct sockaddr *) &address, sizeof(address)))
die("bind");

if (listen(sock,5))
die("listen") ;

while (( new_socket = accept(sock, (struct sockaddr *) &address,&addrLength)) >=0)

{
copyData(new_socket,1);
}

if (new_socket < 0)
die("accept");

close(sock);
//return EXIT_SUCCESS;
}
Smilie
 

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Server::Relay(3pm)					User Contributed Perl Documentation					Server::Relay(3pm)

NAME
Net::SMTP::Server::Relay - A simple relay module for Net::SMTP::Server. SYNOPSIS
use Carp; use Net::SMTP::Server; use Net::SMTP::Server::Client; use Net::SMTP::Server::Relay; $server = new Net::SMTP::Server('localhost', 25) || croak("Unable to handle client connection: $! "); while($conn = $server->accept()) { # We can perform all sorts of checks here for spammers, ACLs, # and other useful stuff to check on a connection. # Handle the client's connection and spawn off a new parser. # This can/should be a fork() or a new thread, # but for simplicity... my $client = new Net::SMTP::Server::Client($conn) || croak("Unable to handle client connection: $! "); # Process the client. This command will block until # the connecting client completes the SMTP transaction. $client->process || next; # In this simple server, we're just relaying everything # to a server. If a real server were implemented, you # could save email to a file, or perform various other # actions on it here. my $relay = new Net::SMTP::Server::Relay($client->{FROM}, $client->{TO}, $client->{MSG}); } DESCRIPTION
The Net::SMTP::Server::Relay module implements simple SMTP relaying for use with the Net::SMTP::Server module. All this module does is to take a given message and iterate through the list of recipients, doing DNS lookups for the associated MX record and delivering the messages. This module makes extensive use of the plethora of other modules already implemented for Perl (specifically the DNS and Net::SMTP modules in this case), and should give but a glimpse of the potential for extending the Net::SMTP::Server's functionality to provide a full-featured SMTP server, native to Perl. The above example illustrates the use of the Net::SMTP::Server::Relay modules -- you simply have to instantiate the module, passing along the sender, recipients, and message. More formally: $relay = new Net::SMTP::Server::Relay($from, @to, $msg); Where $from is the sender, @to is an array containing the list of recipients, and $msg is the message to relay. AUTHOR AND COPYRIGHT Net::SMTP::Server / SMTP::Server is Copyright(C) 1999, MacGyver (aka Habeeb J. Dihu) <macgyver@tos.net>. ALL RIGHTS RESERVED. You may distribute this package under the terms of either the GNU General Public License or the Artistic License, as specified in the Perl README file. SEE ALSO
Net::SMTP::Server::Server, Net::SMTP::Server::Client perl v5.10.1 1999-12-28 Server::Relay(3pm)
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