1 /*- 2 * Copyright (c) 2011 Wojciech A. Koszek <wkoszek@FreeBSD.org> 3 * Copyright (c) 2014 Pedro Souza <pedrosouza@freebsd.org> 4 * All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 18 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 25 * SUCH DAMAGE. 26 */ 27 28 #include <sys/cdefs.h> 29 __FBSDID("$FreeBSD$"); 30 31 #include <stand.h> 32 #include "bootstrap.h" 33 34 #define lua_c 35 36 #include "lstd.h" 37 38 #include <lua.h> 39 #include <ldebug.h> 40 #include <lauxlib.h> 41 #include <lualib.h> 42 43 #include <lerrno.h> 44 #include <lfs.h> 45 #include <lutils.h> 46 47 struct interp_lua_softc { 48 lua_State *luap; 49 }; 50 51 static struct interp_lua_softc lua_softc; 52 53 #ifdef LUA_DEBUG 54 #define LDBG(...) do { \ 55 printf("%s(%d): ", __func__, __LINE__); \ 56 printf(__VA_ARGS__); \ 57 printf("\n"); \ 58 } while (0) 59 #else 60 #define LDBG(...) 61 #endif 62 63 #define LOADER_LUA LUA_PATH "/loader.lua" 64 65 INTERP_DEFINE("lua"); 66 67 static void * 68 interp_lua_realloc(void *ud __unused, void *ptr, size_t osize __unused, size_t nsize) 69 { 70 71 if (nsize == 0) { 72 free(ptr); 73 return NULL; 74 } 75 return realloc(ptr, nsize); 76 } 77 78 /* 79 * The libraries commented out below either lack the proper 80 * support from libsa, or they are unlikely to be useful 81 * in the bootloader, so have been commented out. 82 */ 83 static const luaL_Reg loadedlibs[] = { 84 {"_G", luaopen_base}, 85 {LUA_LOADLIBNAME, luaopen_package}, 86 // {LUA_COLIBNAME, luaopen_coroutine}, 87 // {LUA_TABLIBNAME, luaopen_table}, 88 {LUA_STRLIBNAME, luaopen_string}, 89 // {LUA_IOLIBNAME, luaopen_io}, 90 // {LUA_OSLIBNAME, luaopen_os}, 91 // {LUA_MATHLIBNAME, luaopen_math}, 92 // {LUA_UTF8LIBNAME, luaopen_utf8}, 93 // {LUA_DBLIBNAME, luaopen_debug}, 94 {"errno", luaopen_errno}, 95 {"io", luaopen_io}, 96 {"lfs", luaopen_lfs}, 97 {"loader", luaopen_loader}, 98 {NULL, NULL} 99 }; 100 101 void 102 interp_init(void) 103 { 104 lua_State *luap; 105 struct interp_lua_softc *softc = &lua_softc; 106 const char *filename; 107 const luaL_Reg *lib; 108 109 setenv("script.lang", "lua", 1); 110 LDBG("creating context"); 111 112 luap = lua_newstate(interp_lua_realloc, NULL); 113 if (luap == NULL) { 114 printf("problem initializing the Lua interpreter\n"); 115 abort(); 116 } 117 softc->luap = luap; 118 119 /* "require" functions from 'loadedlibs' and set results to global table */ 120 for (lib = loadedlibs; lib->func; lib++) { 121 luaL_requiref(luap, lib->name, lib->func, 1); 122 lua_pop(luap, 1); /* remove lib */ 123 } 124 125 filename = LOADER_LUA; 126 if (interp_include(filename) != 0) { 127 const char *errstr = lua_tostring(luap, -1); 128 errstr = errstr == NULL ? "unknown" : errstr; 129 printf("Startup error in %s:\nLUA ERROR: %s.\n", filename, errstr); 130 lua_pop(luap, 1); 131 setenv("autoboot_delay", "NO", 1); 132 } 133 } 134 135 int 136 interp_run(const char *line) 137 { 138 int argc, nargc; 139 char **argv; 140 lua_State *luap; 141 struct interp_lua_softc *softc = &lua_softc; 142 int status, ret; 143 144 luap = softc->luap; 145 LDBG("executing line..."); 146 if ((status = luaL_dostring(luap, line)) != 0) { 147 lua_pop(luap, 1); 148 /* 149 * The line wasn't executable as lua; run it through parse to 150 * to get consistent parsing of command line arguments, then 151 * run it through cli_execute. If that fails, then we'll try it 152 * as a builtin. 153 */ 154 command_errmsg = NULL; 155 if (parse(&argc, &argv, line) == 0) { 156 lua_getglobal(luap, "cli_execute"); 157 for (nargc = 0; nargc < argc; ++nargc) { 158 lua_pushstring(luap, argv[nargc]); 159 } 160 status = lua_pcall(luap, argc, 1, 0); 161 ret = lua_tointeger(luap, 1); 162 lua_pop(luap, 1); 163 if (status != 0 || ret != 0) { 164 /* 165 * Lua cli_execute will pass the function back 166 * through loader.command, which is a proxy to 167 * interp_builtin_cmd. If we failed to interpret 168 * the command, though, then there's a chance 169 * that didn't happen. Call interp_builtin_cmd 170 * directly if our lua_pcall was not successful. 171 */ 172 status = interp_builtin_cmd(argc, argv); 173 } 174 if (status != 0) { 175 if (command_errmsg != NULL) 176 printf("%s\n", command_errmsg); 177 else 178 printf("Command failed\n"); 179 status = CMD_ERROR; 180 } 181 free(argv); 182 } else { 183 printf("Failed to parse \'%s\'\n", line); 184 status = CMD_ERROR; 185 } 186 } 187 188 return (status == 0 ? CMD_OK : CMD_ERROR); 189 } 190 191 int 192 interp_include(const char *filename) 193 { 194 struct interp_lua_softc *softc = &lua_softc; 195 196 LDBG("loading file %s", filename); 197 198 return (luaL_dofile(softc->luap, filename)); 199 } 200