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 <stand.h>
29 #include "bootstrap.h"
30
31 #define lua_c
32
33 #include "lstd.h"
34
35 #include <lua.h>
36 #include <ldebug.h>
37 #include <lauxlib.h>
38 #include <lualib.h>
39
40 #include <lerrno.h>
41 #include <lfs.h>
42 #include <lutils.h>
43
44 struct interp_lua_softc {
45 lua_State *luap;
46 };
47
48 static struct interp_lua_softc lua_softc;
49
50 #ifdef LUA_DEBUG
51 #define LDBG(...) do { \
52 printf("%s(%d): ", __func__, __LINE__); \
53 printf(__VA_ARGS__); \
54 printf("\n"); \
55 } while (0)
56 #else
57 #define LDBG(...)
58 #endif
59
60 #define LOADER_LUA LUA_PATH "/loader.lua"
61
62 INTERP_DEFINE("lua");
63
64 static void *
interp_lua_realloc(void * ud __unused,void * ptr,size_t osize __unused,size_t nsize)65 interp_lua_realloc(void *ud __unused, void *ptr, size_t osize __unused, size_t nsize)
66 {
67
68 if (nsize == 0) {
69 free(ptr);
70 return NULL;
71 }
72 return realloc(ptr, nsize);
73 }
74
75 /*
76 * The libraries commented out below either lack the proper
77 * support from libsa, or they are unlikely to be useful
78 * in the bootloader, so have been commented out.
79 */
80 static const luaL_Reg loadedlibs[] = {
81 {"_G", luaopen_base},
82 {LUA_LOADLIBNAME, luaopen_package},
83 // {LUA_COLIBNAME, luaopen_coroutine},
84 // {LUA_TABLIBNAME, luaopen_table},
85 {LUA_STRLIBNAME, luaopen_string},
86 // {LUA_IOLIBNAME, luaopen_io},
87 // {LUA_OSLIBNAME, luaopen_os},
88 // {LUA_MATHLIBNAME, luaopen_math},
89 // {LUA_UTF8LIBNAME, luaopen_utf8},
90 // {LUA_DBLIBNAME, luaopen_debug},
91 {"errno", luaopen_errno},
92 {"io", luaopen_io},
93 {"lfs", luaopen_lfs},
94 {"loader", luaopen_loader},
95 {"pager", luaopen_pager},
96 {NULL, NULL}
97 };
98
99 void
interp_init(void)100 interp_init(void)
101 {
102 lua_State *luap;
103 struct interp_lua_softc *softc = &lua_softc;
104 const char *filename;
105 const luaL_Reg *lib;
106 lua_init_md_t **fnpp;
107
108 TSENTER();
109
110 setenv("script.lang", "lua", 1);
111 LDBG("creating context");
112
113 luap = lua_newstate(interp_lua_realloc, NULL);
114 if (luap == NULL) {
115 printf("problem initializing the Lua interpreter\n");
116 abort();
117 }
118 softc->luap = luap;
119
120 /* "require" functions from 'loadedlibs' and set results to global table */
121 for (lib = loadedlibs; lib->func; lib++) {
122 luaL_requiref(luap, lib->name, lib->func, 1);
123 lua_pop(luap, 1); /* remove lib */
124 }
125
126 LUA_FOREACH_SET(fnpp)
127 (*fnpp)(luap);
128
129 filename = getenv("loader_lua");
130 if (filename == NULL)
131 filename = LOADER_LUA;
132 if (interp_include(filename) != 0) {
133 const char *errstr = lua_tostring(luap, -1);
134 errstr = errstr == NULL ? "unknown" : errstr;
135 printf("ERROR: %s.\n", errstr);
136 lua_pop(luap, 1);
137 setenv("autoboot_delay", "NO", 1);
138 }
139
140 TSEXIT();
141 }
142
143 int
interp_run(const char * line)144 interp_run(const char *line)
145 {
146 int argc, nargc;
147 char **argv;
148 lua_State *luap;
149 struct interp_lua_softc *softc = &lua_softc;
150 int status, ret;
151
152 TSENTER();
153 luap = softc->luap;
154 LDBG("executing line...");
155 if ((status = luaL_dostring(luap, line)) != 0) {
156 lua_pop(luap, 1);
157 /*
158 * The line wasn't executable as lua; run it through parse to
159 * to get consistent parsing of command line arguments, then
160 * run it through cli_execute. If that fails, then we'll try it
161 * as a builtin.
162 */
163 command_errmsg = NULL;
164 if (parse(&argc, &argv, line) == 0) {
165 lua_getglobal(luap, "cli_execute");
166 for (nargc = 0; nargc < argc; ++nargc) {
167 lua_pushstring(luap, argv[nargc]);
168 }
169 status = lua_pcall(luap, argc, 1, 0);
170 ret = lua_tointeger(luap, 1);
171 lua_pop(luap, 1);
172 if (status != 0 || ret != 0) {
173 /*
174 * Lua cli_execute will pass the function back
175 * through loader.command, which is a proxy to
176 * interp_builtin_cmd. If we failed to interpret
177 * the command, though, then there's a chance
178 * that didn't happen. Call interp_builtin_cmd
179 * directly if our lua_pcall was not successful.
180 */
181 status = interp_builtin_cmd(argc, argv);
182 }
183 if (status != 0) {
184 if (command_errmsg != NULL)
185 printf("%s\n", command_errmsg);
186 else
187 printf("Command failed\n");
188 status = CMD_ERROR;
189 }
190 free(argv);
191 } else {
192 printf("Failed to parse \'%s\'\n", line);
193 status = CMD_ERROR;
194 }
195 }
196
197 TSEXIT();
198 return (status == 0 ? CMD_OK : CMD_ERROR);
199 }
200
201 int
interp_include(const char * filename)202 interp_include(const char *filename)
203 {
204 struct interp_lua_softc *softc = &lua_softc;
205
206 LDBG("loading file %s", filename);
207
208 return (luaL_dofile(softc->luap, filename));
209 }
210