mirror of
https://github.com/lunarmodules/luasocket.git
synced 2024-06-26 16:49:47 +02:00
412 lines
14 KiB
C
412 lines
14 KiB
C
/*=========================================================================*\
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* UDP object
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* LuaSocket toolkit
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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 "auxiliar.h"
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#include "socket.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 global_create(lua_State *L);
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static int meth_send(lua_State *L);
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static int meth_sendto(lua_State *L);
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static int meth_receive(lua_State *L);
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static int meth_receivefrom(lua_State *L);
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static int meth_getsockname(lua_State *L);
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static int meth_getpeername(lua_State *L);
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static int meth_setsockname(lua_State *L);
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static int meth_setpeername(lua_State *L);
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static int meth_close(lua_State *L);
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static int meth_setoption(lua_State *L);
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static int meth_settimeout(lua_State *L);
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static int meth_fd(lua_State *L);
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static int meth_dirty(lua_State *L);
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static int opt_dontroute(lua_State *L);
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static int opt_broadcast(lua_State *L);
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static int opt_reuseaddr(lua_State *L);
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static int opt_ip_multicast_ttl(lua_State *L);
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static int opt_ip_multicast_loop(lua_State *L);
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static int opt_ip_add_membership(lua_State *L);
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static int opt_ip_drop_membersip(lua_State *L);
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/* udp object methods */
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static luaL_reg udp[] = {
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{"setpeername", meth_setpeername},
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{"setsockname", meth_setsockname},
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{"getsockname", meth_getsockname},
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{"getpeername", meth_getpeername},
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{"send", meth_send},
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{"sendto", meth_sendto},
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{"receive", meth_receive},
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{"receivefrom", meth_receivefrom},
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{"settimeout", meth_settimeout},
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{"close", meth_close},
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{"setoption", meth_setoption},
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{"__gc", meth_close},
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{"fd", meth_fd},
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{"dirty", meth_dirty},
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{NULL, NULL}
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};
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/* socket options */
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static luaL_reg opt[] = {
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{"dontroute", opt_dontroute},
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{"broadcast", opt_broadcast},
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{"reuseaddr", opt_reuseaddr},
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{"ip-multicast-ttl", opt_ip_multicast_ttl},
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{"ip-multicast-loop", opt_ip_multicast_loop},
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{"ip-add-membership", opt_ip_add_membership},
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{"ip-drop-membership", opt_ip_drop_membersip},
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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", 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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aux_add2group(L, "udp{connected}", "select{able}");
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aux_add2group(L, "udp{unconnected}", "select{able}");
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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 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_getsuccess(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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/* a 'closed' error on an unconnected means the target address was not
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* accepted by the transport layer */
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io_pusherror(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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* Send data through unconnected udp socket
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\*-------------------------------------------------------------------------*/
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static int 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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unsigned short port = (unsigned short) 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_getsuccess(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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/* a 'closed' error on an unconnected means the target address was not
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* accepted by the transport layer */
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io_pusherror(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 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_getsuccess(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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io_pusherror(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 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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socklen_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_getsuccess(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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io_pusherror(L, err);
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return 2;
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}
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}
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/*-------------------------------------------------------------------------*\
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* Select support methods
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\*-------------------------------------------------------------------------*/
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static int meth_fd(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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lua_pushnumber(L, udp->sock);
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return 1;
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}
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static int meth_dirty(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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(void) udp;
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lua_pushboolean(L, 0);
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return 1;
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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 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 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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* Option handlers
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\*-------------------------------------------------------------------------*/
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static int meth_setoption(lua_State *L)
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{
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return aux_meth_setoption(L, opt);
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}
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static int opt_boolean(lua_State *L, int level, int name)
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{
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p_udp udp = (p_udp) aux_checkgroup(L, "udp{any}", 1);
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int val = aux_checkboolean(L, 2);
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if (setsockopt(udp->sock, level, name, (char *) &val, sizeof(val)) < 0) {
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lua_pushnil(L);
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lua_pushstring(L, "setsockopt failed");
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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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static int opt_dontroute(lua_State *L)
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{
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return opt_boolean(L, SOL_SOCKET, SO_DONTROUTE);
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}
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static int opt_reuseaddr(lua_State *L)
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{
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return opt_boolean(L, SOL_SOCKET, SO_REUSEADDR);
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}
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static int opt_broadcast(lua_State *L)
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{
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return opt_boolean(L, SOL_SOCKET, SO_BROADCAST);
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}
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static int opt_ip_multicast_loop(lua_State *L)
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{
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return opt_boolean(L, IPPROTO_IP, IP_MULTICAST_LOOP);
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}
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static int opt_ip_multicast_ttl(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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int val = (int) luaL_checknumber(L, 2);
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if (setsockopt(udp->sock, IPPROTO_IP, IP_MULTICAST_TTL,
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(char *) &val, sizeof(val)) < 0) {
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lua_pushnil(L);
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lua_pushstring(L, "setsockopt failed");
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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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static int opt_membership(lua_State *L, int level, int name)
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{
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p_udp udp = (p_udp) aux_checkgroup(L, "udp{any}", 1);
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struct ip_mreq val;
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if (!lua_istable(L, 2))
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luaL_typerror(L, 2, lua_typename(L, LUA_TTABLE));
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lua_pushstring(L, "multiaddr");
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lua_gettable(L, 2);
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if (!lua_isstring(L, -1)) luaL_argerror(L, 2, "invalid 'group' field");
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if (!inet_aton(lua_tostring(L, -1), &val.imr_multiaddr))
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luaL_argerror(L, 3, "invalid 'multiaddr' ip address");
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lua_pushstring(L, "interface");
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lua_gettable(L, 2);
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if (!lua_isstring(L, -1)) luaL_argerror(L, 2, "invalid 'interface' field");
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val.imr_interface.s_addr = htonl(INADDR_ANY);
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if (strcmp(lua_tostring(L, -1), "*") &&
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!inet_aton(lua_tostring(L, -1), &val.imr_interface))
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luaL_argerror(L, 3, "invalid 'interface' ip address");
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if (setsockopt(udp->sock, level, name, (char *) &val, sizeof(val)) < 0) {
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lua_pushnil(L);
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lua_pushstring(L, "setsockopt failed");
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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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static int opt_ip_add_membership(lua_State *L)
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{
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return opt_membership(L, IPPROTO_IP, IP_ADD_MEMBERSHIP);
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}
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static int opt_ip_drop_membersip(lua_State *L)
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{
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return opt_membership(L, IPPROTO_IP, IP_DROP_MEMBERSHIP);
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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 meth_settimeout(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_settimeout(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 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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p_tm tm = &udp->tm;
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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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(unsigned short) luaL_checknumber(L, 3) :
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(unsigned short) luaL_optnumber(L, 3, 0);
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const char *err;
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err = inet_tryconnect(&udp->sock, address, port, tm_getfailure(tm));
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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 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 meth_setsockname(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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unsigned short port = (unsigned short) 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 global_create(lua_State *L)
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{
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const char *err;
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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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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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