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/*=========================================================================*\
* TCP object
*
* RCS ID: $Id$
\*=========================================================================*/
#include <string.h>
#include <lua.h>
#include <lauxlib.h>
#include "luasocket.h"
#include "auxiliar.h"
#include "socket.h"
#include "inet.h"
#include "error.h"
#include "tcp.h"
/*=========================================================================*\
* Internal function prototypes
\*=========================================================================*/
static int global_create(lua_State *L);
static int meth_connect(lua_State *L);
static int meth_bind(lua_State *L);
static int meth_send(lua_State *L);
static int meth_getsockname(lua_State *L);
static int meth_getpeername(lua_State *L);
static int meth_receive(lua_State *L);
static int meth_accept(lua_State *L);
static int meth_close(lua_State *L);
static int meth_timeout(lua_State *L);
static int meth_fd(lua_State *L);
static int meth_dirty(lua_State *L);
/* tcp object methods */
static luaL_reg tcp[] = {
{"connect", meth_connect},
{"send", meth_send},
{"receive", meth_receive},
{"bind", meth_bind},
{"accept", meth_accept},
{"setpeername", meth_connect},
{"setsockname", meth_bind},
{"getpeername", meth_getpeername},
{"getsockname", meth_getsockname},
{"timeout", meth_timeout},
{"close", meth_close},
{"fd", meth_fd},
{"dirty", meth_dirty},
{NULL, NULL}
};
/* functions in library namespace */
static luaL_reg func[] = {
{"tcp", global_create},
{NULL, NULL}
};
/*-------------------------------------------------------------------------*\
* Initializes module
\*-------------------------------------------------------------------------*/
void tcp_open(lua_State *L)
{
/* create classes */
aux_newclass(L, "tcp{master}", tcp);
aux_newclass(L, "tcp{client}", tcp);
aux_newclass(L, "tcp{server}", tcp);
/* create class groups */
aux_add2group(L, "tcp{master}", "tcp{any}");
aux_add2group(L, "tcp{client}", "tcp{any}");
aux_add2group(L, "tcp{server}", "tcp{any}");
aux_add2group(L, "tcp{client}", "tcp{client, server}");
aux_add2group(L, "tcp{server}", "tcp{client, server}");
aux_add2group(L, "tcp{client}", "select{able}");
aux_add2group(L, "tcp{server}", "select{able}");
/* define library functions */
luaL_openlib(L, LUASOCKET_LIBNAME, func, 0);
lua_pop(L, 1);
}
/*=========================================================================*\
* Lua methods
\*=========================================================================*/
/*-------------------------------------------------------------------------*\
* Just call buffered IO methods
\*-------------------------------------------------------------------------*/
static int meth_send(lua_State *L)
{
p_tcp tcp = (p_tcp) aux_checkclass(L, "tcp{client}", 1);
return buf_meth_send(L, &tcp->buf);
}
static int meth_receive(lua_State *L)
{
p_tcp tcp = (p_tcp) aux_checkclass(L, "tcp{client}", 1);
return buf_meth_receive(L, &tcp->buf);
}
/*-------------------------------------------------------------------------*\
* Select support methods
\*-------------------------------------------------------------------------*/
static int meth_fd(lua_State *L)
{
p_tcp tcp = (p_tcp) aux_checkclass(L, "tcp{client, server}", 1);
lua_pushnumber(L, tcp->sock);
return 1;
}
static int meth_dirty(lua_State *L)
{
p_tcp tcp = (p_tcp) aux_checkclass(L, "tcp{client, server}", 1);
lua_pushboolean(L, !buf_isempty(&tcp->buf));
return 1;
}
/*-------------------------------------------------------------------------*\
* Just call inet methods
\*-------------------------------------------------------------------------*/
static int meth_getpeername(lua_State *L)
{
p_tcp tcp = (p_tcp) aux_checkclass(L, "tcp{client}", 1);
return inet_meth_getpeername(L, &tcp->sock);
}
static int meth_getsockname(lua_State *L)
{
p_tcp tcp = (p_tcp) aux_checkgroup(L, "tcp{client, server}", 1);
return inet_meth_getsockname(L, &tcp->sock);
}
/*-------------------------------------------------------------------------*\
* Just call tm methods
\*-------------------------------------------------------------------------*/
static int meth_timeout(lua_State *L)
{
p_tcp tcp = (p_tcp) aux_checkgroup(L, "tcp{any}", 1);
return tm_meth_timeout(L, &tcp->tm);
}
/*-------------------------------------------------------------------------*\
* Closes socket used by object
\*-------------------------------------------------------------------------*/
static int meth_close(lua_State *L)
{
p_tcp tcp = (p_tcp) aux_checkgroup(L, "tcp{any}", 1);
sock_destroy(&tcp->sock);
return 0;
}
/*-------------------------------------------------------------------------*\
* Turns a master tcp object into a client object.
\*-------------------------------------------------------------------------*/
static int meth_connect(lua_State *L)
{
p_tcp tcp = (p_tcp) aux_checkclass(L, "tcp{master}", 1);
const char *address = luaL_checkstring(L, 2);
unsigned short port = (unsigned short) luaL_checknumber(L, 3);
const char *err = inet_tryconnect(&tcp->sock, address, port);
if (err) {
lua_pushnil(L);
lua_pushstring(L, err);
return 2;
}
/* turn master object into a client object */
aux_setclass(L, "tcp{client}", 1);
lua_pushnumber(L, 1);
return 1;
}
/*-------------------------------------------------------------------------*\
* Turns a master object into a server object
\*-------------------------------------------------------------------------*/
static int meth_bind(lua_State *L)
{
p_tcp tcp = (p_tcp) aux_checkclass(L, "tcp{master}", 1);
const char *address = luaL_checkstring(L, 2);
unsigned short port = (unsigned short) luaL_checknumber(L, 3);
int backlog = (int) luaL_optnumber(L, 4, 1);
const char *err = inet_trybind(&tcp->sock, address, port, backlog);
if (err) {
lua_pushnil(L);
lua_pushstring(L, err);
return 2;
}
/* turn master object into a server object */
aux_setclass(L, "tcp{server}", 1);
lua_pushnumber(L, 1);
return 1;
}
/*-------------------------------------------------------------------------*\
* Waits for and returns a client object attempting connection to the
* server object
\*-------------------------------------------------------------------------*/
static int meth_accept(lua_State *L)
{
struct sockaddr_in addr;
socklen_t addr_len = sizeof(addr);
p_tcp server = (p_tcp) aux_checkclass(L, "tcp{server}", 1);
p_tm tm = &server->tm;
p_tcp client = lua_newuserdata(L, sizeof(t_tcp));
tm_markstart(tm);
aux_setclass(L, "tcp{client}", -1);
for ( ;; ) {
sock_accept(&server->sock, &client->sock,
(SA *) &addr, &addr_len, tm_get(tm));
if (client->sock == SOCK_INVALID) {
if (tm_get(tm) == 0) {
lua_pushnil(L);
error_push(L, IO_TIMEOUT);
return 2;
}
} else break;
}
/* initialize remaining structure fields */
io_init(&client->io, (p_send) sock_send, (p_recv) sock_recv, &client->sock);
tm_init(&client->tm, -1, -1);
buf_init(&client->buf, &client->io, &client->tm);
return 1;
}
/*=========================================================================*\
* Library functions
\*=========================================================================*/
/*-------------------------------------------------------------------------*\
* Creates a master tcp object
\*-------------------------------------------------------------------------*/
int global_create(lua_State *L)
{
const char *err;
/* allocate tcp object */
p_tcp tcp = (p_tcp) lua_newuserdata(L, sizeof(t_tcp));
/* set its type as master object */
aux_setclass(L, "tcp{master}", -1);
/* try to allocate a system socket */
err = inet_trycreate(&tcp->sock, SOCK_STREAM);
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 remaining structure fields */
io_init(&tcp->io, (p_send) sock_send, (p_recv) sock_recv, &tcp->sock);
tm_init(&tcp->tm, -1, -1);
buf_init(&tcp->buf, &tcp->io, &tcp->tm);
return 1;
}
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