mirror of
https://github.com/lunarmodules/luasocket.git
synced 2024-11-16 02:08:21 +01:00
264 lines
9.1 KiB
C
264 lines
9.1 KiB
C
/*=========================================================================*\
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* UDP object
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*
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* RCS ID: $Id$
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\*=========================================================================*/
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#include <string.h>
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#include <lua.h>
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#include <lauxlib.h>
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#include "luasocket.h"
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#include "aux.h"
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#include "inet.h"
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#include "udp.h"
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/*=========================================================================*\
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* Internal function prototypes
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\*=========================================================================*/
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static int udp_global_create(lua_State *L);
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static int udp_meth_send(lua_State *L);
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static int udp_meth_sendto(lua_State *L);
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static int udp_meth_receive(lua_State *L);
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static int udp_meth_receivefrom(lua_State *L);
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static int udp_meth_getsockname(lua_State *L);
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static int udp_meth_getpeername(lua_State *L);
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static int udp_meth_setsockname(lua_State *L);
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static int udp_meth_setpeername(lua_State *L);
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static int udp_meth_close(lua_State *L);
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static int udp_meth_timeout(lua_State *L);
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/* udp object methods */
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static luaL_reg udp[] = {
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{"setpeername", udp_meth_setpeername},
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{"setsockname", udp_meth_setsockname},
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{"getsockname", udp_meth_getsockname},
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{"getpeername", udp_meth_getpeername},
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{"send", udp_meth_send},
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{"sendto", udp_meth_sendto},
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{"receive", udp_meth_receive},
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{"receivefrom", udp_meth_receivefrom},
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{"timeout", udp_meth_timeout},
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{"close", udp_meth_close},
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{NULL, NULL}
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};
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/* functions in library namespace */
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static luaL_reg func[] = {
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{"udp", udp_global_create},
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{NULL, NULL}
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};
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/*-------------------------------------------------------------------------*\
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* Initializes module
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\*-------------------------------------------------------------------------*/
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void udp_open(lua_State *L)
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{
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/* create classes */
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aux_newclass(L, "udp{connected}", udp);
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aux_newclass(L, "udp{unconnected}", udp);
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/* create class groups */
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aux_add2group(L, "udp{connected}", "udp{any}");
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aux_add2group(L, "udp{unconnected}", "udp{any}");
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/* define library functions */
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luaL_openlib(L, LUASOCKET_LIBNAME, func, 0);
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lua_pop(L, 1);
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}
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/*=========================================================================*\
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* Lua methods
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\*=========================================================================*/
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/*-------------------------------------------------------------------------*\
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* Send data through connected udp socket
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\*-------------------------------------------------------------------------*/
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static int udp_meth_send(lua_State *L)
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{
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p_udp udp = (p_udp) aux_checkclass(L, "udp{connected}", 1);
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p_tm tm = &udp->tm;
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size_t count, sent = 0;
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int err;
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const char *data = luaL_checklstring(L, 2, &count);
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tm_markstart(tm);
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err = sock_send(&udp->sock, data, count, &sent, tm_get(tm));
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if (err == IO_DONE) lua_pushnumber(L, sent);
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else lua_pushnil(L);
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error_push(L, err);
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return 2;
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}
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/*-------------------------------------------------------------------------*\
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* Send data through unconnected udp socket
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\*-------------------------------------------------------------------------*/
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static int udp_meth_sendto(lua_State *L)
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{
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p_udp udp = (p_udp) aux_checkclass(L, "udp{unconnected}", 1);
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size_t count, sent = 0;
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const char *data = luaL_checklstring(L, 2, &count);
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const char *ip = luaL_checkstring(L, 3);
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ushort port = (ushort) luaL_checknumber(L, 4);
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p_tm tm = &udp->tm;
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struct sockaddr_in addr;
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int err;
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memset(&addr, 0, sizeof(addr));
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if (!inet_aton(ip, &addr.sin_addr))
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luaL_argerror(L, 3, "invalid ip address");
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addr.sin_family = AF_INET;
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addr.sin_port = htons(port);
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tm_markstart(tm);
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err = sock_sendto(&udp->sock, data, count, &sent,
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(SA *) &addr, sizeof(addr), tm_get(tm));
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if (err == IO_DONE) lua_pushnumber(L, sent);
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else lua_pushnil(L);
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error_push(L, err == IO_CLOSED ? IO_REFUSED : err);
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return 2;
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}
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/*-------------------------------------------------------------------------*\
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* Receives data from a UDP socket
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\*-------------------------------------------------------------------------*/
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static int udp_meth_receive(lua_State *L)
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{
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p_udp udp = (p_udp) aux_checkgroup(L, "udp{any}", 1);
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char buffer[UDP_DATAGRAMSIZE];
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size_t got, count = (size_t) luaL_optnumber(L, 2, sizeof(buffer));
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int err;
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p_tm tm = &udp->tm;
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count = MIN(count, sizeof(buffer));
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tm_markstart(tm);
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err = sock_recv(&udp->sock, buffer, count, &got, tm_get(tm));
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if (err == IO_DONE) lua_pushlstring(L, buffer, got);
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else lua_pushnil(L);
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error_push(L, err);
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return 2;
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}
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/*-------------------------------------------------------------------------*\
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* Receives data and sender from a UDP socket
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\*-------------------------------------------------------------------------*/
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static int udp_meth_receivefrom(lua_State *L)
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{
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p_udp udp = (p_udp) aux_checkclass(L, "udp{unconnected}", 1);
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struct sockaddr_in addr;
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size_t addr_len = sizeof(addr);
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char buffer[UDP_DATAGRAMSIZE];
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size_t got, count = (size_t) luaL_optnumber(L, 2, sizeof(buffer));
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int err;
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p_tm tm = &udp->tm;
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tm_markstart(tm);
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count = MIN(count, sizeof(buffer));
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err = sock_recvfrom(&udp->sock, buffer, count, &got,
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(SA *) &addr, &addr_len, tm_get(tm));
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if (err == IO_DONE) {
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lua_pushlstring(L, buffer, got);
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lua_pushstring(L, inet_ntoa(addr.sin_addr));
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lua_pushnumber(L, ntohs(addr.sin_port));
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return 3;
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} else {
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lua_pushnil(L);
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error_push(L, err);
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return 2;
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}
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}
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/*-------------------------------------------------------------------------*\
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* Just call inet methods
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\*-------------------------------------------------------------------------*/
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static int udp_meth_getpeername(lua_State *L)
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{
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p_udp udp = (p_udp) aux_checkclass(L, "udp{connected}", 1);
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return inet_meth_getpeername(L, &udp->sock);
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}
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static int udp_meth_getsockname(lua_State *L)
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{
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p_udp udp = (p_udp) aux_checkgroup(L, "udp{any}", 1);
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return inet_meth_getsockname(L, &udp->sock);
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}
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/*-------------------------------------------------------------------------*\
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* Just call tm methods
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\*-------------------------------------------------------------------------*/
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static int udp_meth_timeout(lua_State *L)
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{
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p_udp udp = (p_udp) aux_checkgroup(L, "udp{any}", 1);
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return tm_meth_timeout(L, &udp->tm);
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}
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/*-------------------------------------------------------------------------*\
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* Turns a master udp object into a client object.
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\*-------------------------------------------------------------------------*/
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static int udp_meth_setpeername(lua_State *L)
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{
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p_udp udp = (p_udp) aux_checkclass(L, "udp{unconnected}", 1);
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const char *address = luaL_checkstring(L, 2);
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int connecting = strcmp(address, "*");
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unsigned short port = connecting ?
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(ushort) luaL_checknumber(L, 3) : (ushort) luaL_optnumber(L, 3, 0);
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const char *err = inet_tryconnect(&udp->sock, address, port);
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if (err) {
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lua_pushnil(L);
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lua_pushstring(L, err);
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return 2;
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}
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/* change class to connected or unconnected depending on address */
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if (connecting) aux_setclass(L, "udp{connected}", 1);
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else aux_setclass(L, "udp{unconnected}", 1);
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lua_pushnumber(L, 1);
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return 1;
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}
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/*-------------------------------------------------------------------------*\
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* Closes socket used by object
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\*-------------------------------------------------------------------------*/
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static int udp_meth_close(lua_State *L)
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{
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p_udp udp = (p_udp) aux_checkgroup(L, "udp{any}", 1);
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sock_destroy(&udp->sock);
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return 0;
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}
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/*-------------------------------------------------------------------------*\
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* Turns a master object into a server object
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\*-------------------------------------------------------------------------*/
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static int udp_meth_setsockname(lua_State *L)
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{
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p_udp udp = (p_udp) aux_checkclass(L, "udp{master}", 1);
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const char *address = luaL_checkstring(L, 2);
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unsigned short port = (ushort) luaL_checknumber(L, 3);
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const char *err = inet_trybind(&udp->sock, address, port, -1);
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if (err) {
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lua_pushnil(L);
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lua_pushstring(L, err);
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return 2;
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}
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lua_pushnumber(L, 1);
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return 1;
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}
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/*=========================================================================*\
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* Library functions
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\*=========================================================================*/
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/*-------------------------------------------------------------------------*\
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* Creates a master udp object
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\*-------------------------------------------------------------------------*/
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int udp_global_create(lua_State *L)
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{
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/* allocate udp object */
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p_udp udp = (p_udp) lua_newuserdata(L, sizeof(t_udp));
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/* set its type as master object */
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aux_setclass(L, "udp{unconnected}", -1);
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/* try to allocate a system socket */
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const char *err = inet_trycreate(&udp->sock, SOCK_DGRAM);
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if (err) {
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/* get rid of object on stack and push error */
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lua_pop(L, 1);
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lua_pushnil(L);
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lua_pushstring(L, err);
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return 2;
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}
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/* initialize timeout management */
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tm_init(&udp->tm, -1, -1);
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return 1;
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}
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