450 lines
16 KiB
C++
450 lines
16 KiB
C++
/*=========================================================================*\
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* UDP object
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* LuaSocket toolkit
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\*=========================================================================*/
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#include <string.h>
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#include <stdlib.h>
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#include "lua.h"
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#include "lauxlib.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 "options.h"
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#include "udp.h"
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/* min and max macros */
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#ifndef MIN
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#define MIN(x, y) ((x) < (y) ? x : y)
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#endif
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#ifndef MAX
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#define MAX(x, y) ((x) > (y) ? x : y)
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#endif
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#ifdef _WIN32
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#define gai_strerror gai_strerrorA
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#endif
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namespace NS_SLUA {
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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_global_create6(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_getfamily(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_setoption(lua_State *L);
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static int udp_meth_getoption(lua_State *L);
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static int udp_meth_settimeout(lua_State *L);
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static int udp_meth_getfd(lua_State *L);
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static int udp_meth_setfd(lua_State *L);
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static int udp_meth_dirty(lua_State *L);
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/* udp object methods */
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static luaL_Reg udp_methods[] = {
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{"__gc", udp_meth_close},
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{"__tostring", auxiliar_tostring},
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{"close", udp_meth_close},
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{"dirty", udp_meth_dirty},
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{"getfamily", udp_meth_getfamily},
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{"getfd", udp_meth_getfd},
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{"getpeername", udp_meth_getpeername},
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{"getsockname", udp_meth_getsockname},
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{"receive", udp_meth_receive},
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{"receivefrom", udp_meth_receivefrom},
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{"send", udp_meth_send},
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{"sendto", udp_meth_sendto},
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{"setfd", udp_meth_setfd},
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{"setoption", udp_meth_setoption},
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{"getoption", udp_meth_getoption},
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{"setpeername", udp_meth_setpeername},
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{"setsockname", udp_meth_setsockname},
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{"settimeout", udp_meth_settimeout},
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{NULL, NULL}
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};
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/* socket options for setoption */
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static t_opt udp_optset[] = {
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{"dontroute", opt_set_dontroute},
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{"broadcast", opt_set_broadcast},
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{"reuseaddr", opt_set_reuseaddr},
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{"reuseport", opt_set_reuseport},
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{"ip-multicast-if", opt_set_ip_multicast_if},
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{"ip-multicast-ttl", opt_set_ip_multicast_ttl},
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{"ip-multicast-loop", opt_set_ip_multicast_loop},
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{"ip-add-membership", opt_set_ip_add_membership},
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{"ip-drop-membership", opt_set_ip_drop_membersip},
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{"ipv6-unicast-hops", opt_set_ip6_unicast_hops},
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{"ipv6-multicast-hops", opt_set_ip6_unicast_hops},
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{"ipv6-multicast-loop", opt_set_ip6_multicast_loop},
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{"ipv6-add-membership", opt_set_ip6_add_membership},
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{"ipv6-drop-membership", opt_set_ip6_drop_membersip},
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{"ipv6-v6only", opt_set_ip6_v6only},
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{NULL, NULL}
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};
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/* socket options for getoption */
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static t_opt udp_optget[] = {
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{"ip-multicast-if", opt_get_ip_multicast_if},
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{"ip-multicast-loop", opt_get_ip_multicast_loop},
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{"error", opt_get_error},
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{"ipv6-unicast-hops", opt_get_ip6_unicast_hops},
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{"ipv6-multicast-hops", opt_get_ip6_unicast_hops},
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{"ipv6-multicast-loop", opt_get_ip6_multicast_loop},
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{"ipv6-v6only", opt_get_ip6_v6only},
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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 udp_func[] = {
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{"udp", udp_global_create},
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{"udp6", udp_global_create6},
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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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int udp_open(lua_State *L)
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{
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/* create classes */
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auxiliar_newclass(L, "udp{connected}", udp_methods);
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auxiliar_newclass(L, "udp{unconnected}", udp_methods);
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/* create class groups */
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auxiliar_add2group(L, "udp{connected}", "udp{any}");
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auxiliar_add2group(L, "udp{unconnected}", "udp{any}");
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auxiliar_add2group(L, "udp{connected}", "select{able}");
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auxiliar_add2group(L, "udp{unconnected}", "select{able}");
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/* define library functions */
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#if LUA_VERSION_NUM > 501 && !defined(LUA_COMPAT_MODULE)
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luaL_setfuncs(L, udp_func, 0);
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#else
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luaL_openlib(L, NULL, udp_func, 0);
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#endif
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return 0;
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}
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/*=========================================================================*\
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* Lua methods
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\*=========================================================================*/
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const char *udp_strerror(int err) {
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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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if (err == IO_CLOSED) return "refused";
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else return socket_strerror(err);
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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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p_udp udp = (p_udp) auxiliar_checkclass(L, "udp{connected}", 1);
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p_timeout 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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timeout_markstart(tm);
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err = socket_send(&udp->sock, data, count, &sent, tm);
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if (err != IO_DONE) {
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lua_pushnil(L);
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lua_pushstring(L, udp_strerror(err));
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return 2;
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}
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lua_pushnumber(L, (lua_Number) sent);
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return 1;
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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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p_udp udp = (p_udp) auxiliar_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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const char *port = luaL_checkstring(L, 4);
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p_timeout tm = &udp->tm;
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int err;
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struct addrinfo aihint;
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struct addrinfo *ai;
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memset(&aihint, 0, sizeof(aihint));
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aihint.ai_family = udp->family;
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aihint.ai_socktype = SOCK_DGRAM;
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aihint.ai_flags = AI_NUMERICHOST | AI_NUMERICSERV;
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err = getaddrinfo(ip, port, &aihint, &ai);
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if (err) {
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lua_pushnil(L);
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lua_pushstring(L, gai_strerror(err));
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return 2;
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}
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timeout_markstart(tm);
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err = socket_sendto(&udp->sock, data, count, &sent, ai->ai_addr,
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(socklen_t) ai->ai_addrlen, tm);
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freeaddrinfo(ai);
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if (err != IO_DONE) {
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lua_pushnil(L);
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lua_pushstring(L, udp_strerror(err));
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return 2;
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}
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lua_pushnumber(L, (lua_Number) sent);
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return 1;
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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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p_udp udp = (p_udp) auxiliar_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_timeout tm = &udp->tm;
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count = MIN(count, sizeof(buffer));
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timeout_markstart(tm);
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err = socket_recv(&udp->sock, buffer, count, &got, tm);
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/* Unlike TCP, recv() of zero is not closed, but a zero-length packet. */
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if (err == IO_CLOSED)
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err = IO_DONE;
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if (err != IO_DONE) {
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lua_pushnil(L);
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lua_pushstring(L, udp_strerror(err));
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return 2;
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}
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lua_pushlstring(L, buffer, got);
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return 1;
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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) auxiliar_checkclass(L, "udp{unconnected}", 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_timeout tm = &udp->tm;
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struct sockaddr_storage addr;
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socklen_t addr_len = sizeof(addr);
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char addrstr[INET6_ADDRSTRLEN];
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char portstr[6];
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timeout_markstart(tm);
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count = MIN(count, sizeof(buffer));
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err = socket_recvfrom(&udp->sock, buffer, count, &got, (SA *) &addr,
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&addr_len, tm);
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/* Unlike TCP, recv() of zero is not closed, but a zero-length packet. */
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if (err == IO_CLOSED)
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err = IO_DONE;
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if (err != IO_DONE) {
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lua_pushnil(L);
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lua_pushstring(L, udp_strerror(err));
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return 2;
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}
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err = getnameinfo((struct sockaddr *)&addr, addr_len, addrstr,
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INET6_ADDRSTRLEN, portstr, 6, NI_NUMERICHOST | NI_NUMERICSERV);
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if (err) {
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lua_pushnil(L);
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lua_pushstring(L, gai_strerror(err));
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return 2;
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}
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lua_pushlstring(L, buffer, got);
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lua_pushstring(L, addrstr);
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lua_pushinteger(L, (int) strtol(portstr, (char **) NULL, 10));
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return 3;
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}
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/*-------------------------------------------------------------------------*\
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* Returns family as string
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\*-------------------------------------------------------------------------*/
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static int udp_meth_getfamily(lua_State *L)
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{
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p_udp udp = (p_udp) auxiliar_checkgroup(L, "udp{any}", 1);
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if (udp->family == PF_INET6) {
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lua_pushliteral(L, "inet6");
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return 1;
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} else {
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lua_pushliteral(L, "inet4");
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return 1;
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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 udp_meth_getfd(lua_State *L) {
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p_udp udp = (p_udp) auxiliar_checkgroup(L, "udp{any}", 1);
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lua_pushnumber(L, (int) udp->sock);
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return 1;
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}
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/* this is very dangerous, but can be handy for those that are brave enough */
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static int udp_meth_setfd(lua_State *L) {
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p_udp udp = (p_udp) auxiliar_checkgroup(L, "udp{any}", 1);
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udp->sock = (t_socket) luaL_checknumber(L, 2);
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return 0;
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}
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static int udp_meth_dirty(lua_State *L) {
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p_udp udp = (p_udp) auxiliar_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 udp_meth_getpeername(lua_State *L) {
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p_udp udp = (p_udp) auxiliar_checkclass(L, "udp{connected}", 1);
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return inet_meth_getpeername(L, &udp->sock, udp->family);
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}
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static int udp_meth_getsockname(lua_State *L) {
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p_udp udp = (p_udp) auxiliar_checkgroup(L, "udp{any}", 1);
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return inet_meth_getsockname(L, &udp->sock, udp->family);
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}
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/*-------------------------------------------------------------------------*\
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* Just call option handler
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\*-------------------------------------------------------------------------*/
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static int udp_meth_setoption(lua_State *L) {
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p_udp udp = (p_udp) auxiliar_checkgroup(L, "udp{any}", 1);
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return opt_meth_setoption(L, udp_optset, &udp->sock);
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}
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/*-------------------------------------------------------------------------*\
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* Just call option handler
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\*-------------------------------------------------------------------------*/
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static int udp_meth_getoption(lua_State *L) {
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p_udp udp = (p_udp) auxiliar_checkgroup(L, "udp{any}", 1);
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return opt_meth_getoption(L, udp_optget, &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_settimeout(lua_State *L) {
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p_udp udp = (p_udp) auxiliar_checkgroup(L, "udp{any}", 1);
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return timeout_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 udp_meth_setpeername(lua_State *L) {
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p_udp udp = (p_udp) auxiliar_checkgroup(L, "udp{any}", 1);
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p_timeout 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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const char *port = connecting? luaL_checkstring(L, 3): "0";
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struct addrinfo connecthints;
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const char *err;
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memset(&connecthints, 0, sizeof(connecthints));
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connecthints.ai_socktype = SOCK_DGRAM;
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/* make sure we try to connect only to the same family */
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connecthints.ai_family = udp->family;
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if (connecting) {
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err = inet_tryconnect(&udp->sock, &udp->family, address,
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port, tm, &connecthints);
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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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auxiliar_setclass(L, "udp{connected}", 1);
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} else {
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/* we ignore possible errors because Mac OS X always
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* returns EAFNOSUPPORT */
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inet_trydisconnect(&udp->sock, udp->family, tm);
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auxiliar_setclass(L, "udp{unconnected}", 1);
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}
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/* change class to connected or unconnected depending on address */
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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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p_udp udp = (p_udp) auxiliar_checkgroup(L, "udp{any}", 1);
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socket_destroy(&udp->sock);
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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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* 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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p_udp udp = (p_udp) auxiliar_checkclass(L, "udp{unconnected}", 1);
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const char *address = luaL_checkstring(L, 2);
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const char *port = luaL_checkstring(L, 3);
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const char *err;
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struct addrinfo bindhints;
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memset(&bindhints, 0, sizeof(bindhints));
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bindhints.ai_socktype = SOCK_DGRAM;
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bindhints.ai_family = udp->family;
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bindhints.ai_flags = AI_PASSIVE;
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err = inet_trybind(&udp->sock, address, port, &bindhints);
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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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static int udp_create(lua_State *L, int family) {
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t_socket sock;
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const char *err = inet_trycreate(&sock, family, SOCK_DGRAM);
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/* try to allocate a system socket */
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if (!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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auxiliar_setclass(L, "udp{unconnected}", -1);
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/* initialize remaining structure fields */
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socket_setnonblocking(&sock);
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if (family == PF_INET6) {
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int yes = 1;
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setsockopt(sock, IPPROTO_IPV6, IPV6_V6ONLY,
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reinterpret_cast<const char*>(&yes), sizeof(yes));
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}
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udp->sock = sock;
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timeout_init(&udp->tm, -1, -1);
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udp->family = family;
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return 1;
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} else {
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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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}
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static int udp_global_create(lua_State *L) {
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return udp_create(L, AF_INET);
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}
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static int udp_global_create6(lua_State *L) {
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return udp_create(L, AF_INET6);
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}
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} // end NS_SLUA
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