494 lines
17 KiB
C++
494 lines
17 KiB
C++
/*=========================================================================*\
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* TCP object
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* LuaSocket toolkit
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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 "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 "tcp.h"
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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 tcp_global_create(lua_State *L);
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static int tcp_global_create6(lua_State *L);
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static int tcp_global_connect(lua_State *L);
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static int tcp_meth_connect(lua_State *L);
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static int tcp_meth_listen(lua_State *L);
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static int tcp_meth_getfamily(lua_State *L);
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static int tcp_meth_bind(lua_State *L);
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static int tcp_meth_send(lua_State *L);
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static int tcp_meth_getstats(lua_State *L);
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static int tcp_meth_setstats(lua_State *L);
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static int tcp_meth_getsockname(lua_State *L);
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static int tcp_meth_getpeername(lua_State *L);
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static int tcp_meth_shutdown(lua_State *L);
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static int tcp_meth_receive(lua_State *L);
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static int tcp_meth_accept(lua_State *L);
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static int tcp_meth_close(lua_State *L);
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static int tcp_meth_getoption(lua_State *L);
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static int tcp_meth_setoption(lua_State *L);
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static int tcp_meth_settimeout(lua_State *L);
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static int tcp_meth_getfd(lua_State *L);
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static int tcp_meth_setfd(lua_State *L);
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static int tcp_meth_dirty(lua_State *L);
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/* tcp object methods */
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static luaL_Reg tcp_methods[] = {
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{"__gc", tcp_meth_close},
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{"__tostring", auxiliar_tostring},
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{"accept", tcp_meth_accept},
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{"bind", tcp_meth_bind},
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{"close", tcp_meth_close},
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{"connect", tcp_meth_connect},
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{"dirty", tcp_meth_dirty},
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{"getfamily", tcp_meth_getfamily},
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{"getfd", tcp_meth_getfd},
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{"getoption", tcp_meth_getoption},
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{"getpeername", tcp_meth_getpeername},
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{"getsockname", tcp_meth_getsockname},
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{"getstats", tcp_meth_getstats},
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{"setstats", tcp_meth_setstats},
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{"listen", tcp_meth_listen},
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{"receive", tcp_meth_receive},
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{"send", tcp_meth_send},
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{"setfd", tcp_meth_setfd},
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{"setoption", tcp_meth_setoption},
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{"setpeername", tcp_meth_connect},
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{"setsockname", tcp_meth_bind},
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{"settimeout", tcp_meth_settimeout},
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{"shutdown", tcp_meth_shutdown},
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{NULL, NULL}
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};
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/* socket option handlers */
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static t_opt tcp_optget[] = {
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{"keepalive", opt_get_keepalive},
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{"reuseaddr", opt_get_reuseaddr},
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{"tcp-nodelay", opt_get_tcp_nodelay},
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{"linger", opt_get_linger},
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{"error", opt_get_error},
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{NULL, NULL}
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};
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static t_opt tcp_optset[] = {
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{"keepalive", opt_set_keepalive},
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{"reuseaddr", opt_set_reuseaddr},
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{"tcp-nodelay", opt_set_tcp_nodelay},
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{"ipv6-v6only", opt_set_ip6_v6only},
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{"linger", opt_set_linger},
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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 tcp_func[] = {
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{"tcp", tcp_global_create},
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{"tcp6", tcp_global_create6},
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{"connect", tcp_global_connect},
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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 tcp_open(lua_State *L)
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{
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/* create classes */
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auxiliar_newclass(L, "tcp{master}", tcp_methods);
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auxiliar_newclass(L, "tcp{client}", tcp_methods);
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auxiliar_newclass(L, "tcp{server}", tcp_methods);
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/* create class groups */
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auxiliar_add2group(L, "tcp{master}", "tcp{any}");
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auxiliar_add2group(L, "tcp{client}", "tcp{any}");
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auxiliar_add2group(L, "tcp{server}", "tcp{any}");
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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, tcp_func, 0);
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#else
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luaL_openlib(L, NULL, tcp_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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/*-------------------------------------------------------------------------*\
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* Just call buffered IO methods
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\*-------------------------------------------------------------------------*/
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static int tcp_meth_send(lua_State *L) {
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p_tcp tcp = (p_tcp) auxiliar_checkclass(L, "tcp{client}", 1);
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return buffer_meth_send(L, &tcp->buf);
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}
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static int tcp_meth_receive(lua_State *L) {
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p_tcp tcp = (p_tcp) auxiliar_checkclass(L, "tcp{client}", 1);
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return buffer_meth_receive(L, &tcp->buf);
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}
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static int tcp_meth_getstats(lua_State *L) {
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p_tcp tcp = (p_tcp) auxiliar_checkclass(L, "tcp{client}", 1);
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return buffer_meth_getstats(L, &tcp->buf);
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}
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static int tcp_meth_setstats(lua_State *L) {
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p_tcp tcp = (p_tcp) auxiliar_checkclass(L, "tcp{client}", 1);
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return buffer_meth_setstats(L, &tcp->buf);
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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 tcp_meth_getoption(lua_State *L)
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{
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p_tcp tcp = (p_tcp) auxiliar_checkgroup(L, "tcp{any}", 1);
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return opt_meth_getoption(L, tcp_optget, &tcp->sock);
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}
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static int tcp_meth_setoption(lua_State *L)
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{
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p_tcp tcp = (p_tcp) auxiliar_checkgroup(L, "tcp{any}", 1);
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return opt_meth_setoption(L, tcp_optset, &tcp->sock);
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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 tcp_meth_getfd(lua_State *L)
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{
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p_tcp tcp = (p_tcp) auxiliar_checkgroup(L, "tcp{any}", 1);
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lua_pushnumber(L, (int) tcp->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 tcp_meth_setfd(lua_State *L)
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{
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p_tcp tcp = (p_tcp) auxiliar_checkgroup(L, "tcp{any}", 1);
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tcp->sock = (t_socket) luaL_checknumber(L, 2);
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return 0;
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}
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static int tcp_meth_dirty(lua_State *L)
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{
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p_tcp tcp = (p_tcp) auxiliar_checkgroup(L, "tcp{any}", 1);
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lua_pushboolean(L, !buffer_isempty(&tcp->buf));
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return 1;
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}
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/*-------------------------------------------------------------------------*\
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* Waits for and returns a client object attempting connection to the
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* server object
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\*-------------------------------------------------------------------------*/
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static int tcp_meth_accept(lua_State *L)
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{
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p_tcp server = (p_tcp) auxiliar_checkclass(L, "tcp{server}", 1);
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p_timeout tm = timeout_markstart(&server->tm);
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t_socket sock;
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const char *err = inet_tryaccept(&server->sock, server->family, &sock, tm);
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/* if successful, push client socket */
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if (err == NULL) {
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p_tcp clnt = (p_tcp) lua_newuserdata(L, sizeof(t_tcp));
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auxiliar_setclass(L, "tcp{client}", -1);
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/* initialize structure fields */
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memset(clnt, 0, sizeof(t_tcp));
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socket_setnonblocking(&sock);
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clnt->sock = sock;
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io_init(&clnt->io, (p_send) socket_send, (p_recv) socket_recv,
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(p_error) socket_ioerror, &clnt->sock);
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timeout_init(&clnt->tm, -1, -1);
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buffer_init(&clnt->buf, &clnt->io, &clnt->tm);
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clnt->family = server->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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/*-------------------------------------------------------------------------*\
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* Binds an object to an address
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\*-------------------------------------------------------------------------*/
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static int tcp_meth_bind(lua_State *L)
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{
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p_tcp tcp = (p_tcp) auxiliar_checkclass(L, "tcp{master}", 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_STREAM;
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bindhints.ai_family = tcp->family;
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bindhints.ai_flags = AI_PASSIVE;
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err = inet_trybind(&tcp->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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* Turns a master tcp object into a client object.
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\*-------------------------------------------------------------------------*/
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static int tcp_meth_connect(lua_State *L)
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{
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p_tcp tcp = (p_tcp) auxiliar_checkgroup(L, "tcp{any}", 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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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_STREAM;
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/* make sure we try to connect only to the same family */
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connecthints.ai_family = tcp->family;
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timeout_markstart(&tcp->tm);
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err = inet_tryconnect(&tcp->sock, &tcp->family, address, port,
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&tcp->tm, &connecthints);
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/* have to set the class even if it failed due to non-blocking connects */
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auxiliar_setclass(L, "tcp{client}", 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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* Closes socket used by object
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\*-------------------------------------------------------------------------*/
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static int tcp_meth_close(lua_State *L)
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{
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p_tcp tcp = (p_tcp) auxiliar_checkgroup(L, "tcp{any}", 1);
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socket_destroy(&tcp->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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* Returns family as string
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\*-------------------------------------------------------------------------*/
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static int tcp_meth_getfamily(lua_State *L)
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{
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p_tcp tcp = (p_tcp) auxiliar_checkgroup(L, "tcp{any}", 1);
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if (tcp->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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* Puts the sockt in listen mode
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\*-------------------------------------------------------------------------*/
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static int tcp_meth_listen(lua_State *L)
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{
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p_tcp tcp = (p_tcp) auxiliar_checkclass(L, "tcp{master}", 1);
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int backlog = (int) luaL_optnumber(L, 2, 32);
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int err = socket_listen(&tcp->sock, backlog);
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if (err != IO_DONE) {
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lua_pushnil(L);
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lua_pushstring(L, socket_strerror(err));
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return 2;
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}
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/* turn master object into a server object */
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auxiliar_setclass(L, "tcp{server}", 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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* Shuts the connection down partially
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\*-------------------------------------------------------------------------*/
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static int tcp_meth_shutdown(lua_State *L)
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{
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/* SHUT_RD, SHUT_WR, SHUT_RDWR have the value 0, 1, 2, so we can use method index directly */
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static const char* methods[] = { "receive", "send", "both", NULL };
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p_tcp tcp = (p_tcp) auxiliar_checkclass(L, "tcp{client}", 1);
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int how = luaL_checkoption(L, 2, "both", methods);
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socket_shutdown(&tcp->sock, how);
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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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* Just call inet methods
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\*-------------------------------------------------------------------------*/
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static int tcp_meth_getpeername(lua_State *L)
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{
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p_tcp tcp = (p_tcp) auxiliar_checkgroup(L, "tcp{any}", 1);
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return inet_meth_getpeername(L, &tcp->sock, tcp->family);
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}
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static int tcp_meth_getsockname(lua_State *L)
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{
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p_tcp tcp = (p_tcp) auxiliar_checkgroup(L, "tcp{any}", 1);
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return inet_meth_getsockname(L, &tcp->sock, tcp->family);
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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 tcp_meth_settimeout(lua_State *L)
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{
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p_tcp tcp = (p_tcp) auxiliar_checkgroup(L, "tcp{any}", 1);
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return timeout_meth_settimeout(L, &tcp->tm);
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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 tcp object
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\*-------------------------------------------------------------------------*/
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static int tcp_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_STREAM);
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/* try to allocate a system socket */
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if (!err) {
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/* allocate tcp object */
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p_tcp tcp = (p_tcp) lua_newuserdata(L, sizeof(t_tcp));
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memset(tcp, 0, sizeof(t_tcp));
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/* set its type as master object */
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auxiliar_setclass(L, "tcp{master}", -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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tcp->sock = sock;
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io_init(&tcp->io, (p_send) socket_send, (p_recv) socket_recv,
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(p_error) socket_ioerror, &tcp->sock);
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timeout_init(&tcp->tm, -1, -1);
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buffer_init(&tcp->buf, &tcp->io, &tcp->tm);
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tcp->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 tcp_global_create(lua_State *L) {
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return tcp_create(L, AF_INET);
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}
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static int tcp_global_create6(lua_State *L) {
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return tcp_create(L, AF_INET6);
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}
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#if 0
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static const char *tryconnect6(const char *remoteaddr, const char *remoteserv,
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struct addrinfo *connecthints, p_tcp tcp) {
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struct addrinfo *iterator = NULL, *resolved = NULL;
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const char *err = NULL;
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/* try resolving */
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err = socket_gaistrerror(getaddrinfo(remoteaddr, remoteserv,
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connecthints, &resolved));
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if (err != NULL) {
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if (resolved) freeaddrinfo(resolved);
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return err;
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}
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/* iterate over all returned addresses trying to connect */
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for (iterator = resolved; iterator; iterator = iterator->ai_next) {
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p_timeout tm = timeout_markstart(&tcp->tm);
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/* create new socket if necessary. if there was no
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* bind, we need to create one for every new family
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* that shows up while iterating. if there was a
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* bind, all families will be the same and we will
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* not enter this branch. */
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if (tcp->family != iterator->ai_family) {
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socket_destroy(&tcp->sock);
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err = socket_strerror(socket_create(&tcp->sock,
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iterator->ai_family, iterator->ai_socktype,
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iterator->ai_protocol));
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if (err != NULL) {
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freeaddrinfo(resolved);
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return err;
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}
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tcp->family = iterator->ai_family;
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/* all sockets initially non-blocking */
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socket_setnonblocking(&tcp->sock);
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}
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/* finally try connecting to remote address */
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err = socket_strerror(socket_connect(&tcp->sock,
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(SA *) iterator->ai_addr,
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(socklen_t) iterator->ai_addrlen, tm));
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/* if success, break out of loop */
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if (err == NULL) break;
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}
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freeaddrinfo(resolved);
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/* here, if err is set, we failed */
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return err;
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}
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#endif
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static int tcp_global_connect(lua_State *L) {
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const char *remoteaddr = luaL_checkstring(L, 1);
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const char *remoteserv = luaL_checkstring(L, 2);
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const char *localaddr = luaL_optstring(L, 3, NULL);
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const char *localserv = luaL_optstring(L, 4, "0");
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int family = inet_optfamily(L, 5, "unspec");
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p_tcp tcp = (p_tcp) lua_newuserdata(L, sizeof(t_tcp));
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struct addrinfo bindhints, connecthints;
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const char *err = NULL;
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/* initialize tcp structure */
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memset(tcp, 0, sizeof(t_tcp));
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io_init(&tcp->io, (p_send) socket_send, (p_recv) socket_recv,
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(p_error) socket_ioerror, &tcp->sock);
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timeout_init(&tcp->tm, -1, -1);
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buffer_init(&tcp->buf, &tcp->io, &tcp->tm);
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tcp->sock = SOCKET_INVALID;
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tcp->family = PF_UNSPEC;
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/* allow user to pick local address and port */
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memset(&bindhints, 0, sizeof(bindhints));
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bindhints.ai_socktype = SOCK_STREAM;
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bindhints.ai_family = family;
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bindhints.ai_flags = AI_PASSIVE;
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if (localaddr) {
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err = inet_trybind(&tcp->sock, localaddr, localserv, &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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tcp->family = bindhints.ai_family;
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}
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/* try to connect to remote address and port */
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memset(&connecthints, 0, sizeof(connecthints));
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connecthints.ai_socktype = SOCK_STREAM;
|
|
/* make sure we try to connect only to the same family */
|
|
connecthints.ai_family = bindhints.ai_family;
|
|
err = inet_tryconnect(&tcp->sock, &tcp->family, remoteaddr, remoteserv,
|
|
&tcp->tm, &connecthints);
|
|
if (err) {
|
|
socket_destroy(&tcp->sock);
|
|
lua_pushnil(L);
|
|
lua_pushstring(L, err);
|
|
return 2;
|
|
}
|
|
auxiliar_setclass(L, "tcp{client}", -1);
|
|
return 1;
|
|
}
|
|
|
|
} // end NS_SLUA
|