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Top Forums Programming Reading and Writing file on LAN Post 302112759 by Hitori on Friday 30th of March 2007 02:50:10 AM
Old 03-30-2007
When you use URL url = new URL("http://192.168.0.2/myfile.txt"); in Java you actually read the file with the help of HTTP protocol over TCP, to make this in C you need to

1) use sockets (SOCK_STREAM since we are using TCP protocol) to establish connection to the remote server 192.168.0.2 on port 80 (this is default for http protocol)
(see http://beej.us/guide/bgnet/output/htmlsingle/bgnet.html, the great tutorial for sockets programming)
2) you need to send HTTP GET Request to the server over created socket, e.g.
Code:
GET /myfile.txt HTTP/1.0
Host: 192.168.0.2

(see RFC 2616)
3) then you need to parse HTTP Response (if you lucky you just need to remove HTTP header, if not you need to decode base64 encoding, handle HTTP errors etc., all information about what you need to do written in HTTP Response header)
(see RFC 2616)

If you still want to recieve file from remote server in C program try some library for HTTP protocol, you can also use Perl or scp for instance.
 

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SSL(3pm)						User Contributed Perl Documentation						  SSL(3pm)

NAME
HTTP::Daemon::SSL - a simple http server class with SSL support SYNOPSIS
use HTTP::Daemon::SSL; use HTTP::Status; # Make sure you have a certs/ directory with "server-cert.pem" # and "server-key.pem" in it before running this! my $d = HTTP::Daemon::SSL->new || die; print "Please contact me at: <URL:", $d->url, "> "; while (my $c = $d->accept) { while (my $r = $c->get_request) { if ($r->method eq 'GET' and $r->url->path eq "/xyzzy") { # remember, this is *not* recommened practice :-) $c->send_file_response("/etc/passwd"); } else { $c->send_error(RC_FORBIDDEN) } } $c->close; undef($c); } DESCRIPTION
Instances of the HTTP::Daemon::SSL class are HTTP/1.1 servers that listen on a socket for incoming requests. The HTTP::Daemon::SSL is a sub-class of IO::Socket::SSL, so you can perform socket operations directly on it too. The accept() method will return when a connection from a client is available. In a scalar context the returned value will be a reference to a object of the HTTP::Daemon::ClientConn::SSL class which is another IO::Socket::SSL subclass. In a list context a two-element array is returned containing the new HTTP::Daemon::ClientConn::SSL reference and the peer address; the list will be empty upon failure. (Note that version 1.02 erroneously did not honour list context). Calling the get_request() method on the HTTP::Daemon::ClientConn::SSL object will read data from the client and return an HTTP::Request object reference. This HTTPS daemon does not fork(2) for you. Your application, i.e. the user of the HTTP::Daemon::SSL is reponsible for forking if that is desirable. Also note that the user is responsible for generating responses that conform to the HTTP/1.1 protocol. The HTTP::Daemon::ClientConn class provides some methods that make this easier. METHODS
The following methods are the only differences from the HTTP::Daemon base class: $d = new HTTP::Daemon::SSL The constructor takes the same parameters as the IO::Socket::SSL constructor. It can also be called without specifying any parameters, but you will have to make sure that you have an SSL certificate and key for the server in certs/server-cert.pem and certs/server-key.pem. See the IO::Socket::SSL documentation for how to change these default locations and specify many other aspects of SSL behavior. The daemon will then set up a listen queue of 5 connections and allocate some random port number. A server that wants to bind to some specific address on the standard HTTPS port will be constructed like this: $d = new HTTP::Daemon::SSL LocalAddr => 'www.someplace.com', LocalPort => 443; SEE ALSO
RFC 2068 IO::Socket::SSL, HTTP::Daemon, Apache COPYRIGHT
Code and documentation from HTTP::Daemon Copyright 1996-2001, Gisle Aas Changes Copyright 2003-2004, Peter Behroozi This library is free software; you can redistribute it and/or modify it under the same terms as Perl itself. perl v5.10.1 2011-04-02 SSL(3pm)
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