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/*=========================================================================*\
* UDP object
*
* RCS ID: $Id$
\*=========================================================================*/
#include <string.h>
#include <lua.h>
#include <lauxlib.h>
#include "luasocket.h"
#include "aux.h"
#include "inet.h"
#include "udp.h"
/*=========================================================================*\
* Internal function prototypes
\*=========================================================================*/
static int udp_global_create(lua_State *L);
static int udp_meth_send(lua_State *L);
static int udp_meth_sendto(lua_State *L);
static int udp_meth_receive(lua_State *L);
static int udp_meth_receivefrom(lua_State *L);
static int udp_meth_getsockname(lua_State *L);
static int udp_meth_getpeername(lua_State *L);
static int udp_meth_setsockname(lua_State *L);
static int udp_meth_setpeername(lua_State *L);
static int udp_meth_close(lua_State *L);
static int udp_meth_timeout(lua_State *L);
/* udp object methods */
static luaL_reg udp[] = {
{"setpeername", udp_meth_setpeername},
{"setsockname", udp_meth_setsockname},
{"getsockname", udp_meth_getsockname},
{"getpeername", udp_meth_getpeername},
{"send", udp_meth_send},
{"sendto", udp_meth_sendto},
{"receive", udp_meth_receive},
{"receivefrom", udp_meth_receivefrom},
{"timeout", udp_meth_timeout},
{"close", udp_meth_close},
{NULL, NULL}
};
/* functions in library namespace */
static luaL_reg func[] = {
{"udp", udp_global_create},
{NULL, NULL}
};
/*-------------------------------------------------------------------------*\
* Initializes module
\*-------------------------------------------------------------------------*/
void udp_open(lua_State *L)
{
/* create classes */
aux_newclass(L, "udp{connected}", udp);
aux_newclass(L, "udp{unconnected}", udp);
/* create class groups */
aux_add2group(L, "udp{connected}", "udp{any}");
aux_add2group(L, "udp{unconnected}", "udp{any}");
/* define library functions */
luaL_openlib(L, LUASOCKET_LIBNAME, func, 0);
lua_pop(L, 1);
}
/*=========================================================================*\
* Lua methods
\*=========================================================================*/
/*-------------------------------------------------------------------------*\
* Send data through connected udp socket
\*-------------------------------------------------------------------------*/
static int udp_meth_send(lua_State *L)
{
p_udp udp = (p_udp) aux_checkclass(L, "udp{connected}", 1);
p_tm tm = &udp->tm;
size_t count, sent = 0;
int err;
const char *data = luaL_checklstring(L, 2, &count);
tm_markstart(tm);
err = sock_send(&udp->sock, data, count, &sent, tm_get(tm));
if (err == IO_DONE) lua_pushnumber(L, sent);
else lua_pushnil(L);
error_push(L, err);
return 2;
}
/*-------------------------------------------------------------------------*\
* Send data through unconnected udp socket
\*-------------------------------------------------------------------------*/
static int udp_meth_sendto(lua_State *L)
{
p_udp udp = (p_udp) aux_checkclass(L, "udp{unconnected}", 1);
size_t count, sent = 0;
const char *data = luaL_checklstring(L, 2, &count);
const char *ip = luaL_checkstring(L, 3);
ushort port = (ushort) luaL_checknumber(L, 4);
p_tm tm = &udp->tm;
struct sockaddr_in addr;
int err;
memset(&addr, 0, sizeof(addr));
if (!inet_aton(ip, &addr.sin_addr))
luaL_argerror(L, 3, "invalid ip address");
addr.sin_family = AF_INET;
addr.sin_port = htons(port);
tm_markstart(tm);
err = sock_sendto(&udp->sock, data, count, &sent,
(SA *) &addr, sizeof(addr), tm_get(tm));
if (err == IO_DONE) lua_pushnumber(L, sent);
else lua_pushnil(L);
error_push(L, err == IO_CLOSED ? IO_REFUSED : err);
return 2;
}
/*-------------------------------------------------------------------------*\
* Receives data from a UDP socket
\*-------------------------------------------------------------------------*/
static int udp_meth_receive(lua_State *L)
{
p_udp udp = (p_udp) aux_checkgroup(L, "udp{any}", 1);
char buffer[UDP_DATAGRAMSIZE];
size_t got, count = (size_t) luaL_optnumber(L, 2, sizeof(buffer));
int err;
p_tm tm = &udp->tm;
count = MIN(count, sizeof(buffer));
tm_markstart(tm);
err = sock_recv(&udp->sock, buffer, count, &got, tm_get(tm));
if (err == IO_DONE) lua_pushlstring(L, buffer, got);
else lua_pushnil(L);
error_push(L, err);
return 2;
}
/*-------------------------------------------------------------------------*\
* Receives data and sender from a UDP socket
\*-------------------------------------------------------------------------*/
static int udp_meth_receivefrom(lua_State *L)
{
p_udp udp = (p_udp) aux_checkclass(L, "udp{unconnected}", 1);
struct sockaddr_in addr;
size_t addr_len = sizeof(addr);
char buffer[UDP_DATAGRAMSIZE];
size_t got, count = (size_t) luaL_optnumber(L, 2, sizeof(buffer));
int err;
p_tm tm = &udp->tm;
tm_markstart(tm);
count = MIN(count, sizeof(buffer));
err = sock_recvfrom(&udp->sock, buffer, count, &got,
(SA *) &addr, &addr_len, tm_get(tm));
if (err == IO_DONE) {
lua_pushlstring(L, buffer, got);
lua_pushstring(L, inet_ntoa(addr.sin_addr));
lua_pushnumber(L, ntohs(addr.sin_port));
return 3;
} else {
lua_pushnil(L);
error_push(L, err);
return 2;
}
}
/*-------------------------------------------------------------------------*\
* Just call inet methods
\*-------------------------------------------------------------------------*/
static int udp_meth_getpeername(lua_State *L)
{
p_udp udp = (p_udp) aux_checkclass(L, "udp{connected}", 1);
return inet_meth_getpeername(L, &udp->sock);
}
static int udp_meth_getsockname(lua_State *L)
{
p_udp udp = (p_udp) aux_checkgroup(L, "udp{any}", 1);
return inet_meth_getsockname(L, &udp->sock);
}
/*-------------------------------------------------------------------------*\
* Just call tm methods
\*-------------------------------------------------------------------------*/
static int udp_meth_timeout(lua_State *L)
{
p_udp udp = (p_udp) aux_checkgroup(L, "udp{any}", 1);
return tm_meth_timeout(L, &udp->tm);
}
/*-------------------------------------------------------------------------*\
* Turns a master udp object into a client object.
\*-------------------------------------------------------------------------*/
static int udp_meth_setpeername(lua_State *L)
{
p_udp udp = (p_udp) aux_checkclass(L, "udp{unconnected}", 1);
const char *address = luaL_checkstring(L, 2);
int connecting = strcmp(address, "*");
unsigned short port = connecting ?
(ushort) luaL_checknumber(L, 3) : (ushort) luaL_optnumber(L, 3, 0);
const char *err = inet_tryconnect(&udp->sock, address, port);
if (err) {
lua_pushnil(L);
lua_pushstring(L, err);
return 2;
}
/* change class to connected or unconnected depending on address */
if (connecting) aux_setclass(L, "udp{connected}", 1);
else aux_setclass(L, "udp{unconnected}", 1);
lua_pushnumber(L, 1);
return 1;
}
/*-------------------------------------------------------------------------*\
* Closes socket used by object
\*-------------------------------------------------------------------------*/
static int udp_meth_close(lua_State *L)
{
p_udp udp = (p_udp) aux_checkgroup(L, "udp{any}", 1);
sock_destroy(&udp->sock);
return 0;
}
/*-------------------------------------------------------------------------*\
* Turns a master object into a server object
\*-------------------------------------------------------------------------*/
static int udp_meth_setsockname(lua_State *L)
{
p_udp udp = (p_udp) aux_checkclass(L, "udp{master}", 1);
const char *address = luaL_checkstring(L, 2);
unsigned short port = (ushort) luaL_checknumber(L, 3);
const char *err = inet_trybind(&udp->sock, address, port, -1);
if (err) {
lua_pushnil(L);
lua_pushstring(L, err);
return 2;
}
lua_pushnumber(L, 1);
return 1;
}
/*=========================================================================*\
* Library functions
\*=========================================================================*/
/*-------------------------------------------------------------------------*\
* Creates a master udp object
\*-------------------------------------------------------------------------*/
int udp_global_create(lua_State *L)
{
/* allocate udp object */
p_udp udp = (p_udp) lua_newuserdata(L, sizeof(t_udp));
/* set its type as master object */
aux_setclass(L, "udp{unconnected}", -1);
/* try to allocate a system socket */
const char *err = inet_trycreate(&udp->sock, SOCK_DGRAM);
if (err) {
/* get rid of object on stack and push error */
lua_pop(L, 1);
lua_pushnil(L);
lua_pushstring(L, err);
return 2;
}
/* initialize timeout management */
tm_init(&udp->tm, -1, -1);
return 1;
}
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