2 * uhttpd - Tiny single-threaded httpd
4 * Copyright (C) 2010-2013 Jo-Philipp Wich <xm@subsignal.org>
5 * Copyright (C) 2013 Felix Fietkau <nbd@openwrt.org>
7 * Permission to use, copy, modify, and/or distribute this software for any
8 * purpose with or without fee is hereby granted, provided that the above
9 * copyright notice and this permission notice appear in all copies.
11 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
12 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
13 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
14 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
15 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
16 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
17 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
20 #include <libubox/blobmsg.h>
30 #define UH_LUA_CB "handle_request"
32 static const struct uhttpd_ops
*ops
;
33 static struct config
*_conf
;
38 static int uh_lua_recv(lua_State
*L
)
40 static struct pollfd pfd
= {
49 len
= luaL_checknumber(L
, 1);
54 buf
= luaL_prepbuffer(&B
);
55 r
= read(STDIN_FILENO
, buf
, LUAL_BUFFERSIZE
);
57 if (errno
== EWOULDBLOCK
|| errno
== EAGAIN
) {
60 if (pfd
.revents
& POLLIN
)
75 if (r
!= LUAL_BUFFERSIZE
)
80 lua_pushnumber(L
, data_len
);
91 static int uh_lua_send(lua_State
*L
)
96 buf
= luaL_checklstring(L
, 1, &len
);
98 len
= write(STDOUT_FILENO
, buf
, len
);
100 lua_pushnumber(L
, len
);
105 uh_lua_strconvert(lua_State
*L
, int (*convert
)(char *, int, const char *, int))
108 static char out_buf
[4096];
112 in_buf
= luaL_checklstring(L
, 1, &in_len
);
113 out_len
= convert(out_buf
, sizeof(out_buf
), in_buf
, in_len
);
119 error
= "buffer overflow";
121 error
= "malformed string";
123 luaL_error(L
, "%s on URL conversion\n", error
);
126 lua_pushlstring(L
, out_buf
, out_len
);
130 static int uh_lua_urldecode(lua_State
*L
)
132 return uh_lua_strconvert(L
, ops
->urldecode
);
135 static int uh_lua_urlencode(lua_State
*L
)
137 return uh_lua_strconvert(L
, ops
->urlencode
);
140 static lua_State
*uh_lua_state_init(void)
142 const char *msg
= "(unknown error)";
150 /* build uhttpd api table */
153 lua_pushcfunction(L
, uh_lua_send
);
154 lua_setfield(L
, -2, "send");
156 lua_pushcfunction(L
, uh_lua_send
);
157 lua_setfield(L
, -2, "sendc");
159 lua_pushcfunction(L
, uh_lua_recv
);
160 lua_setfield(L
, -2, "recv");
162 lua_pushcfunction(L
, uh_lua_urldecode
);
163 lua_setfield(L
, -2, "urldecode");
165 lua_pushcfunction(L
, uh_lua_urlencode
);
166 lua_setfield(L
, -2, "urlencode");
168 lua_pushstring(L
, conf
.docroot
);
169 lua_setfield(L
, -2, "docroot");
171 lua_setglobal(L
, "uhttpd");
173 ret
= luaL_loadfile(L
, conf
.lua_handler
);
179 ret
= lua_pcall(L
, 0, 0, 0);
181 status
= "initializing";
185 lua_getglobal(L
, UH_LUA_CB
);
186 if (!lua_isfunction(L
, -1)) {
187 fprintf(stderr
, "Error: Lua handler provides no " UH_LUA_CB
"() callback.\n");
194 if (!lua_isnil(L
, -1))
195 msg
= lua_tostring(L
, -1);
197 fprintf(stderr
, "Error %s Lua handler: %s\n", status
, msg
);
202 static void lua_main(struct client
*cl
, struct path_info
*pi
, char *url
)
204 struct blob_attr
*cur
;
208 int path_len
, prefix_len
;
212 lua_getglobal(L
, UH_LUA_CB
);
214 /* new env table for this request */
217 prefix_len
= strlen(conf
.lua_prefix
);
218 path_len
= strlen(url
);
219 str
= strchr(url
, '?');
222 path_len
= str
- url
;
224 if (path_len
> prefix_len
) {
225 lua_pushlstring(L
, url
+ prefix_len
,
226 path_len
- prefix_len
);
227 lua_setfield(L
, -2, "PATH_INFO");
230 for (var
= ops
->get_process_vars(cl
, pi
); var
->name
; var
++) {
234 lua_pushstring(L
, var
->value
);
235 lua_setfield(L
, -2, var
->name
);
238 lua_pushnumber(L
, 0.9 + (cl
->request
.version
/ 10.0));
239 lua_setfield(L
, -2, "HTTP_VERSION");
242 blob_for_each_attr(cur
, cl
->hdr
.head
, rem
) {
243 lua_pushstring(L
, blobmsg_data(cur
));
244 lua_setfield(L
, -2, blobmsg_name(cur
));
246 lua_setfield(L
, -2, "headers");
248 switch(lua_pcall(L
, 1, 0, 0)) {
251 error
= luaL_checkstring(L
, -1);
253 error
= "(unknown error)";
255 printf("Status: 500 Internal Server Error\r\n\r\n"
256 "Unable to launch the requested Lua program:\n"
257 " %s: %s\n", pi
->phys
, strerror(errno
));
263 static void lua_handle_request(struct client
*cl
, char *url
, struct path_info
*pi
)
265 static struct path_info _pi
;
268 pi
->name
= conf
.lua_prefix
;
269 pi
->phys
= conf
.lua_handler
;
271 if (!ops
->create_process(cl
, pi
, url
, lua_main
)) {
272 ops
->client_error(cl
, 500, "Internal Server Error",
273 "Failed to create CGI process: %s", strerror(errno
));
277 static bool check_lua_url(const char *url
)
279 return ops
->path_match(conf
.lua_prefix
, url
);
282 static struct dispatch_handler lua_dispatch
= {
284 .check_url
= check_lua_url
,
285 .handle_request
= lua_handle_request
,
288 static int lua_plugin_init(const struct uhttpd_ops
*o
, struct config
*c
)
292 _L
= uh_lua_state_init();
293 ops
->dispatch_add(&lua_dispatch
);
297 const struct uhttpd_plugin uhttpd_plugin
= {
298 .init
= lua_plugin_init
,