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/** -*-C-*-ish
Kaya standard library
Copyright (C) 2004, 2005 Edwin Brady
This file is distributed under the terms of the GNU Lesser General
Public Licence. See COPYING for licence.
*/
module Net;
import Builtins;
import System;
import Prelude;
import TLS;
// TODO: TLS currently available for client only, server support needed
%include "network_glue.h";
%include "unistd.h";
%imported "network_glue";
// %link "wsock32";
foreign "network_glue.o" {
Void do_net_init(Ptr vm) = net_init;
String net_recv(Ptr vm, Ptr handle, a len) = net_recv;
Ptr net_connect(Ptr vm, Int proto, String server, Int port) = net_connect;
Int net_listen(Ptr vm, Int proto, Int port, Int backlog) = net_listen;
Ptr net_accept(Ptr vm, Int socket) = net_accept;
Void net_shutdown(Ptr h) = net_shutdown;
Void net_close(Ptr h) = net_close;
Void close(Int x) = close;
Void net_send(Ptr vm, Ptr h, String d) = net_send;
Bool net_pending(Ptr vm, Ptr h, Int timeout) = net_pending;
String net_getaddr(Ptr h) = net_getaddr;
}
abstract data NetHandle = NetH(Ptr handle, Maybe<TLSsession> tls);
Int MAXCONN = 128;
public data Protocol = TCP | TCP_IPv4 | TCP_IPv6;
"Initialises networking libraries. Not required on Posix-based systems,
but should be called anyway for compatibility."
public Void netInit() {
do_net_init(getVM());
}
"Connect to a server (optionally using TLS).
Returns connection handle."
public NetHandle connect(Protocol proto, String server, Int port, Bool usetls=false)
{
h = net_connect(getVM(),protocolToInt(proto),server,port);
if (usetls) {
tls = makeTLS(h);
return NetH(h,just(tls));
} else {
return NetH(h,nothing);
}
}
"Listen on a port.
Returns a socket id."
public Int listen(Protocol proto, Int port, Int backlog)
= net_listen(getVM(),protocolToInt(proto),port,backlog);
"Return the Int representation of protocol needed by the C glue library."
Int protocolToInt(Protocol proto) = case proto of {
TCP -> 1;
| TCP_IPv4 -> 1;
| TCP_IPv6 -> 2;
};
"Accept a connection on a socket.
Returns a connection handle."
public NetHandle accept(Int socket) {
h = net_accept(getVM(),socket);
return NetH(h,nothing);
}
"Shutdown a handle."
public Void shutdown(NetHandle h) {
net_shutdown(h.handle);
}
"Close a connection handle."
public Void closeConnection(NetHandle h) {
case h.tls of {
nothing -> ;
| just(tls) -> closeTLS(tls);
}
net_close(h.handle);
}
"Close a socket."
public Void closeSocket(Int x) {
close(x);
}
"Send data across a connection."
public Void send(NetHandle h, String d) {
case h.tls of {
nothing -> net_send(getVM(),h.handle,d);
| just(tls) -> putTLS(tls,d);
}
}
"Recieve data from a connection.
Reads up to <em>maxlen</em> bytes, and times out after <em>timeout</em>
seconds. If <em>maxlen</em> is negative (the default), reads as much as
possible. <em>maxlen</em> and <em>timeout</em> are currently ignored for
TLS connections"
public String recv(NetHandle h, Int maxlen = -1, Int timeout = 0)
{
case h.tls of {
nothing -> return dorecv(h, maxlen, timeout*1000000);
| just(tls) -> return getTLS(tls);
}
}
"Recieve data from a connection. As recv() but with a timeout measured
in microseconds."
public String microRecv(NetHandle h, Int maxlen = -1, Int microtimeout = 0)
{
case h.tls of {
nothing -> return dorecv(h, maxlen, microtimeout);
| just(tls) -> return getTLS(tls);
}
}
// timeout in microseconds
String dorecv(NetHandle h, Int maxlen = -1, Int timeout = 0) {
len = maxlen;
rpt = false;
if (maxlen==-1) {
len = 65535; // Repeatedly read in 64k chunks.
rpt = true;
}
str="";
do {
if (timeout==0) {
str += net_recv(getVM(),h.handle,len);
// putStrLn(str);
}
else {
if (microPending(h,timeout)) {
str += net_recv(getVM(),h.handle,len);
}
else {
throw(Exception("Nothing to receive",1));
}
}
if (len==0) { rpt=false; }
}
while (rpt);
return str;
}
"Return whether data is waiting at a socket.
Times out by default after 5 seconds."
public Bool pending(NetHandle h, Int timeout = 5) {
return net_pending(getVM(),h.handle,timeout*1000000);
}
"Return whether data is waiting at a socket.
Times out by default after 100 microseconds."
public Bool microPending(NetHandle h, Int timeout = 100) {
return net_pending(getVM(),h.handle,timeout);
}
"Get the host name from a connection handle."
public String getHost(NetHandle h) = net_getaddr(h.handle);
|
