364 lines
13 KiB
C++
364 lines
13 KiB
C++
/*=========================================================================*\
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* Unix domain socket
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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 "options.h"
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#include "unix.h"
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#ifndef _WIN32
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#include <sys/un.h>
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#endif // _WIN32
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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 unix_global_create(lua_State *L);
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static int unix_meth_connect(lua_State *L);
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static int unix_meth_listen(lua_State *L);
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static int unix_meth_bind(lua_State *L);
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static int unix_meth_send(lua_State *L);
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static int unix_meth_shutdown(lua_State *L);
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static int unix_meth_receive(lua_State *L);
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static int unix_meth_accept(lua_State *L);
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static int unix_meth_close(lua_State *L);
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static int unix_meth_setoption(lua_State *L);
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static int unix_meth_settimeout(lua_State *L);
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static int unix_meth_getfd(lua_State *L);
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static int unix_meth_setfd(lua_State *L);
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static int unix_meth_dirty(lua_State *L);
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static int unix_meth_getstats(lua_State *L);
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static int unix_meth_setstats(lua_State *L);
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static const char *unix_tryconnect(p_unix un, const char *path);
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static const char *unix_trybind(p_unix un, const char *path);
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/* unix object methods */
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static luaL_Reg unix_methods[] = {
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{"__gc", unix_meth_close},
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{"__tostring", auxiliar_tostring},
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{"accept", unix_meth_accept},
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{"bind", unix_meth_bind},
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{"close", unix_meth_close},
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{"connect", unix_meth_connect},
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{"dirty", unix_meth_dirty},
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{"getfd", unix_meth_getfd},
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{"getstats", unix_meth_getstats},
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{"setstats", unix_meth_setstats},
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{"listen", unix_meth_listen},
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{"receive", unix_meth_receive},
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{"send", unix_meth_send},
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{"setfd", unix_meth_setfd},
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{"setoption", unix_meth_setoption},
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{"setpeername", unix_meth_connect},
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{"setsockname", unix_meth_bind},
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{"settimeout", unix_meth_settimeout},
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{"shutdown", unix_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 unix_optset[] = {
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{"keepalive", opt_set_keepalive},
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{"reuseaddr", opt_set_reuseaddr},
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{"linger", opt_set_linger},
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{NULL, NULL}
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};
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/* our socket creation function */
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/* this is an ad-hoc module that returns a single function
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* as such, do not include other functions in this array. */
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static luaL_Reg unix_func[] = {
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{"unix", unix_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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int luaopen_socket_unix(lua_State *L) {
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/* create classes */
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auxiliar_newclass(L, "unix{master}", unix_methods);
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auxiliar_newclass(L, "unix{client}", unix_methods);
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auxiliar_newclass(L, "unix{server}", unix_methods);
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/* create class groups */
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auxiliar_add2group(L, "unix{master}", "unix{any}");
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auxiliar_add2group(L, "unix{client}", "unix{any}");
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auxiliar_add2group(L, "unix{server}", "unix{any}");
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#if LUA_VERSION_NUM > 501 && !defined(LUA_COMPAT_MODULE)
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lua_pushcfunction(L, unix_global_create);
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(void)unix_func;
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#else
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/* set function into socket namespace */
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luaL_openlib(L, "socket", unix_func, 0);
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lua_pushcfunction(L, unix_global_create);
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#endif
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/* return the function instead of the 'socket' table */
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return 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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* Just call buffered IO methods
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\*-------------------------------------------------------------------------*/
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static int unix_meth_send(lua_State *L) {
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p_unix un = (p_unix) auxiliar_checkclass(L, "unix{client}", 1);
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return buffer_meth_send(L, &un->buf);
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}
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static int unix_meth_receive(lua_State *L) {
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p_unix un = (p_unix) auxiliar_checkclass(L, "unix{client}", 1);
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return buffer_meth_receive(L, &un->buf);
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}
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static int unix_meth_getstats(lua_State *L) {
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p_unix un = (p_unix) auxiliar_checkclass(L, "unix{client}", 1);
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return buffer_meth_getstats(L, &un->buf);
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}
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static int unix_meth_setstats(lua_State *L) {
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p_unix un = (p_unix) auxiliar_checkclass(L, "unix{client}", 1);
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return buffer_meth_setstats(L, &un->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 unix_meth_setoption(lua_State *L) {
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p_unix un = (p_unix) auxiliar_checkgroup(L, "unix{any}", 1);
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return opt_meth_setoption(L, unix_optset, &un->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 unix_meth_getfd(lua_State *L) {
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p_unix un = (p_unix) auxiliar_checkgroup(L, "unix{any}", 1);
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lua_pushnumber(L, (int) un->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 unix_meth_setfd(lua_State *L) {
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p_unix un = (p_unix) auxiliar_checkgroup(L, "unix{any}", 1);
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un->sock = (t_socket) luaL_checknumber(L, 2);
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return 0;
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}
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static int unix_meth_dirty(lua_State *L) {
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p_unix un = (p_unix) auxiliar_checkgroup(L, "unix{any}", 1);
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lua_pushboolean(L, !buffer_isempty(&un->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 unix_meth_accept(lua_State *L) {
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p_unix server = (p_unix) auxiliar_checkclass(L, "unix{server}", 1);
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p_timeout tm = timeout_markstart(&server->tm);
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t_socket sock;
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int err = socket_accept(&server->sock, &sock, NULL, NULL, tm);
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/* if successful, push client socket */
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if (err == IO_DONE) {
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p_unix clnt = (p_unix) lua_newuserdata(L, sizeof(t_unix));
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auxiliar_setclass(L, "unix{client}", -1);
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/* initialize structure fields */
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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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return 1;
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} else {
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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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}
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/*-------------------------------------------------------------------------*\
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* Binds an object to an address
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\*-------------------------------------------------------------------------*/
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static const char *unix_trybind(p_unix un, const char *path) {
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#ifndef _WIN32
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struct sockaddr_un local;
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size_t len = strlen(path);
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int err;
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if (len >= sizeof(local.sun_path)) return "path too long";
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memset(&local, 0, sizeof(local));
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strcpy(local.sun_path, path);
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local.sun_family = AF_UNIX;
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#ifdef UNIX_HAS_SUN_LEN
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local.sun_len = sizeof(local.sun_family) + sizeof(local.sun_len)
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+ len + 1;
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err = socket_bind(&un->sock, (SA *) &local, local.sun_len);
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#else
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err = socket_bind(&un->sock, (SA *) &local,
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sizeof(local.sun_family) + len);
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#endif
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if (err != IO_DONE) socket_destroy(&un->sock);
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return socket_strerror(err);
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#else
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return NULL;
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#endif
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}
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static int unix_meth_bind(lua_State *L) {
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p_unix un = (p_unix) auxiliar_checkclass(L, "unix{master}", 1);
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const char *path = luaL_checkstring(L, 2);
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const char *err = unix_trybind(un, path);
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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 unix object into a client object.
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\*-------------------------------------------------------------------------*/
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static const char *unix_tryconnect(p_unix un, const char *path)
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{
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#ifndef _WIN32
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struct sockaddr_un remote;
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int err;
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size_t len = strlen(path);
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if (len >= sizeof(remote.sun_path)) return "path too long";
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memset(&remote, 0, sizeof(remote));
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strcpy(remote.sun_path, path);
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remote.sun_family = AF_UNIX;
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timeout_markstart(&un->tm);
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#ifdef UNIX_HAS_SUN_LEN
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remote.sun_len = sizeof(remote.sun_family) + sizeof(remote.sun_len)
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+ len + 1;
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err = socket_connect(&un->sock, (SA *) &remote, remote.sun_len, &un->tm);
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#else
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err = socket_connect(&un->sock, (SA *) &remote,
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sizeof(remote.sun_family) + len, &un->tm);
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#endif
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if (err != IO_DONE) socket_destroy(&un->sock);
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return socket_strerror(err);
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#else
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return NULL;
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#endif
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}
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static int unix_meth_connect(lua_State *L)
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{
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p_unix un = (p_unix) auxiliar_checkclass(L, "unix{master}", 1);
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const char *path = luaL_checkstring(L, 2);
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const char *err = unix_tryconnect(un, path);
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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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/* turn master object into a client object */
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auxiliar_setclass(L, "unix{client}", 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 unix_meth_close(lua_State *L)
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{
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p_unix un = (p_unix) auxiliar_checkgroup(L, "unix{any}", 1);
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socket_destroy(&un->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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* Puts the sockt in listen mode
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\*-------------------------------------------------------------------------*/
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static int unix_meth_listen(lua_State *L)
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{
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p_unix un = (p_unix) auxiliar_checkclass(L, "unix{master}", 1);
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int backlog = (int) luaL_optnumber(L, 2, 32);
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int err = socket_listen(&un->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, "unix{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 unix_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_unix tcp = (p_unix) auxiliar_checkclass(L, "unix{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 tm methods
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\*-------------------------------------------------------------------------*/
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static int unix_meth_settimeout(lua_State *L) {
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p_unix un = (p_unix) auxiliar_checkgroup(L, "unix{any}", 1);
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return timeout_meth_settimeout(L, &un->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 unix object
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\*-------------------------------------------------------------------------*/
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static int unix_global_create(lua_State *L) {
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t_socket sock;
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int err = socket_create(&sock, AF_UNIX, SOCK_STREAM, 0);
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/* try to allocate a system socket */
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if (err == IO_DONE) {
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/* allocate unix object */
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p_unix un = (p_unix) lua_newuserdata(L, sizeof(t_unix));
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/* set its type as master object */
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auxiliar_setclass(L, "unix{master}", -1);
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/* initialize remaining structure fields */
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socket_setnonblocking(&sock);
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un->sock = sock;
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io_init(&un->io, (p_send) socket_send, (p_recv) socket_recv,
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(p_error) socket_ioerror, &un->sock);
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timeout_init(&un->tm, -1, -1);
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buffer_init(&un->buf, &un->io, &un->tm);
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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, socket_strerror(err));
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return 2;
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}
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}
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} // end NS_SLUA
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