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-rw-r--r--src/unix.c364
1 files changed, 44 insertions, 320 deletions
diff --git a/src/unix.c b/src/unix.c
index 91aaaf8..dbc8710 100644
--- a/src/unix.c
+++ b/src/unix.c
@@ -1,346 +1,70 @@
1/*=========================================================================*\ 1/*=========================================================================*\
2* Unix domain socket 2* Unix domain socket
3* LuaSocket toolkit 3* LuaSocket toolkit
4\*=========================================================================*/ 4\*=========================================================================*/
5#include <string.h>
6
7#include "lua.h" 5#include "lua.h"
8#include "lauxlib.h" 6#include "lauxlib.h"
9 7
10#include "auxiliar.h" 8#include "unixstream.h"
11#include "socket.h" 9#include "unixdgram.h"
12#include "options.h"
13#include "unix.h"
14#include <sys/un.h>
15
16/*=========================================================================*\
17* Internal function prototypes
18\*=========================================================================*/
19static int global_create(lua_State *L);
20static int meth_connect(lua_State *L);
21static int meth_listen(lua_State *L);
22static int meth_bind(lua_State *L);
23static int meth_send(lua_State *L);
24static int meth_shutdown(lua_State *L);
25static int meth_receive(lua_State *L);
26static int meth_accept(lua_State *L);
27static int meth_close(lua_State *L);
28static int meth_setoption(lua_State *L);
29static int meth_settimeout(lua_State *L);
30static int meth_getfd(lua_State *L);
31static int meth_setfd(lua_State *L);
32static int meth_dirty(lua_State *L);
33static int meth_getstats(lua_State *L);
34static int meth_setstats(lua_State *L);
35
36static const char *unix_tryconnect(p_unix un, const char *path);
37static const char *unix_trybind(p_unix un, const char *path);
38
39/* unix object methods */
40static luaL_Reg unix_methods[] = {
41 {"__gc", meth_close},
42 {"__tostring", auxiliar_tostring},
43 {"accept", meth_accept},
44 {"bind", meth_bind},
45 {"close", meth_close},
46 {"connect", meth_connect},
47 {"dirty", meth_dirty},
48 {"getfd", meth_getfd},
49 {"getstats", meth_getstats},
50 {"setstats", meth_setstats},
51 {"listen", meth_listen},
52 {"receive", meth_receive},
53 {"send", meth_send},
54 {"setfd", meth_setfd},
55 {"setoption", meth_setoption},
56 {"setpeername", meth_connect},
57 {"setsockname", meth_bind},
58 {"settimeout", meth_settimeout},
59 {"shutdown", meth_shutdown},
60 {NULL, NULL}
61};
62
63/* socket option handlers */
64static t_opt optset[] = {
65 {"keepalive", opt_set_keepalive},
66 {"reuseaddr", opt_set_reuseaddr},
67 {"linger", opt_set_linger},
68 {NULL, NULL}
69};
70
71/* our socket creation function */
72/* this is an ad-hoc module that returns a single function
73 * as such, do not include other functions in this array. */
74static luaL_Reg func[] = {
75 {"unix", global_create},
76 {NULL, NULL}
77};
78
79
80/*-------------------------------------------------------------------------*\
81* Initializes module
82\*-------------------------------------------------------------------------*/
83int luaopen_socket_unix(lua_State *L) {
84 /* create classes */
85 auxiliar_newclass(L, "unix{master}", unix_methods);
86 auxiliar_newclass(L, "unix{client}", unix_methods);
87 auxiliar_newclass(L, "unix{server}", unix_methods);
88 /* create class groups */
89 auxiliar_add2group(L, "unix{master}", "unix{any}");
90 auxiliar_add2group(L, "unix{client}", "unix{any}");
91 auxiliar_add2group(L, "unix{server}", "unix{any}");
92#if LUA_VERSION_NUM > 501 && !defined(LUA_COMPAT_MODULE)
93 lua_pushcfunction(L, global_create);
94 (void) func;
95#else
96 /* set function into socket namespace */
97 luaL_openlib(L, "socket", func, 0);
98 lua_pushcfunction(L, global_create);
99#endif
100 /* return the function instead of the 'socket' table */
101 return 1;
102}
103 10
104/*=========================================================================*\
105* Lua methods
106\*=========================================================================*/
107/*-------------------------------------------------------------------------*\ 11/*-------------------------------------------------------------------------*\
108* Just call buffered IO methods 12* Modules and functions
109\*-------------------------------------------------------------------------*/ 13\*-------------------------------------------------------------------------*/
110static int meth_send(lua_State *L) { 14static const luaL_Reg mod[] = {
111 p_unix un = (p_unix) auxiliar_checkclass(L, "unix{client}", 1); 15 {"stream", unixstream_open},
112 return buffer_meth_send(L, &un->buf); 16 {"dgram", unixdgram_open},
113} 17 {NULL, NULL}
114 18};
115static int meth_receive(lua_State *L) {
116 p_unix un = (p_unix) auxiliar_checkclass(L, "unix{client}", 1);
117 return buffer_meth_receive(L, &un->buf);
118}
119
120static int meth_getstats(lua_State *L) {
121 p_unix un = (p_unix) auxiliar_checkclass(L, "unix{client}", 1);
122 return buffer_meth_getstats(L, &un->buf);
123}
124
125static int meth_setstats(lua_State *L) {
126 p_unix un = (p_unix) auxiliar_checkclass(L, "unix{client}", 1);
127 return buffer_meth_setstats(L, &un->buf);
128}
129
130/*-------------------------------------------------------------------------*\
131* Just call option handler
132\*-------------------------------------------------------------------------*/
133static int meth_setoption(lua_State *L) {
134 p_unix un = (p_unix) auxiliar_checkgroup(L, "unix{any}", 1);
135 return opt_meth_setoption(L, optset, &un->sock);
136}
137
138/*-------------------------------------------------------------------------*\
139* Select support methods
140\*-------------------------------------------------------------------------*/
141static int meth_getfd(lua_State *L) {
142 p_unix un = (p_unix) auxiliar_checkgroup(L, "unix{any}", 1);
143 lua_pushnumber(L, (int) un->sock);
144 return 1;
145}
146
147/* this is very dangerous, but can be handy for those that are brave enough */
148static int meth_setfd(lua_State *L) {
149 p_unix un = (p_unix) auxiliar_checkgroup(L, "unix{any}", 1);
150 un->sock = (t_socket) luaL_checknumber(L, 2);
151 return 0;
152}
153 19
154static int meth_dirty(lua_State *L) { 20static void add_alias(lua_State *L, int index, const char *name, const char *target)
155 p_unix un = (p_unix) auxiliar_checkgroup(L, "unix{any}", 1); 21{
156 lua_pushboolean(L, !buffer_isempty(&un->buf)); 22 lua_getfield(L, index, target);
157 return 1; 23 lua_setfield(L, index, name);
158} 24}
159 25
160/*-------------------------------------------------------------------------*\ 26static int compat_socket_unix_call(lua_State *L)
161* Waits for and returns a client object attempting connection to the 27{
162* server object 28 /* Look up socket.unix.stream in the socket.unix table (which is the first
163\*-------------------------------------------------------------------------*/ 29 * argument). */
164static int meth_accept(lua_State *L) { 30 lua_getfield(L, 1, "stream");
165 p_unix server = (p_unix) auxiliar_checkclass(L, "unix{server}", 1);
166 p_timeout tm = timeout_markstart(&server->tm);
167 t_socket sock;
168 int err = socket_accept(&server->sock, &sock, NULL, NULL, tm);
169 /* if successful, push client socket */
170 if (err == IO_DONE) {
171 p_unix clnt = (p_unix) lua_newuserdata(L, sizeof(t_unix));
172 auxiliar_setclass(L, "unix{client}", -1);
173 /* initialize structure fields */
174 socket_setnonblocking(&sock);
175 clnt->sock = sock;
176 io_init(&clnt->io, (p_send)socket_send, (p_recv)socket_recv,
177 (p_error) socket_ioerror, &clnt->sock);
178 timeout_init(&clnt->tm, -1, -1);
179 buffer_init(&clnt->buf, &clnt->io, &clnt->tm);
180 return 1;
181 } else {
182 lua_pushnil(L);
183 lua_pushstring(L, socket_strerror(err));
184 return 2;
185 }
186}
187 31
188/*-------------------------------------------------------------------------*\ 32 /* Replace the stack entry for the socket.unix table with the
189* Binds an object to an address 33 * socket.unix.stream function. */
190\*-------------------------------------------------------------------------*/ 34 lua_replace(L, 1);
191static const char *unix_trybind(p_unix un, const char *path) {
192 struct sockaddr_un local;
193 size_t len = strlen(path);
194 int err;
195 if (len >= sizeof(local.sun_path)) return "path too long";
196 memset(&local, 0, sizeof(local));
197 strcpy(local.sun_path, path);
198 local.sun_family = AF_UNIX;
199#ifdef UNIX_HAS_SUN_LEN
200 local.sun_len = sizeof(local.sun_family) + sizeof(local.sun_len)
201 + len + 1;
202 err = socket_bind(&un->sock, (SA *) &local, local.sun_len);
203 35
204#else 36 /* Call socket.unix.stream, passing along any arguments. */
205 err = socket_bind(&un->sock, (SA *) &local, 37 int n = lua_gettop(L);
206 sizeof(local.sun_family) + len); 38 lua_call(L, n-1, LUA_MULTRET);
207#endif
208 if (err != IO_DONE) socket_destroy(&un->sock);
209 return socket_strerror(err);
210}
211 39
212static int meth_bind(lua_State *L) { 40 /* Pass along the return values from socket.unix.stream. */
213 p_unix un = (p_unix) auxiliar_checkclass(L, "unix{master}", 1); 41 n = lua_gettop(L);
214 const char *path = luaL_checkstring(L, 2); 42 return n;
215 const char *err = unix_trybind(un, path);
216 if (err) {
217 lua_pushnil(L);
218 lua_pushstring(L, err);
219 return 2;
220 }
221 lua_pushnumber(L, 1);
222 return 1;
223} 43}
224 44
225/*-------------------------------------------------------------------------*\ 45/*-------------------------------------------------------------------------*\
226* Turns a master unix object into a client object. 46* Initializes module
227\*-------------------------------------------------------------------------*/ 47\*-------------------------------------------------------------------------*/
228static const char *unix_tryconnect(p_unix un, const char *path) 48int luaopen_socket_unix(lua_State *L)
229{ 49{
230 struct sockaddr_un remote; 50 int i;
231 int err; 51 lua_newtable(L);
232 size_t len = strlen(path); 52 int socket_unix_table = lua_gettop(L);
233 if (len >= sizeof(remote.sun_path)) return "path too long";
234 memset(&remote, 0, sizeof(remote));
235 strcpy(remote.sun_path, path);
236 remote.sun_family = AF_UNIX;
237 timeout_markstart(&un->tm);
238#ifdef UNIX_HAS_SUN_LEN
239 remote.sun_len = sizeof(remote.sun_family) + sizeof(remote.sun_len)
240 + len + 1;
241 err = socket_connect(&un->sock, (SA *) &remote, remote.sun_len, &un->tm);
242#else
243 err = socket_connect(&un->sock, (SA *) &remote,
244 sizeof(remote.sun_family) + len, &un->tm);
245#endif
246 if (err != IO_DONE) socket_destroy(&un->sock);
247 return socket_strerror(err);
248}
249 53
250static int meth_connect(lua_State *L) 54 for (i = 0; mod[i].name; i++)
251{ 55 mod[i].func(L);
252 p_unix un = (p_unix) auxiliar_checkclass(L, "unix{master}", 1);
253 const char *path = luaL_checkstring(L, 2);
254 const char *err = unix_tryconnect(un, path);
255 if (err) {
256 lua_pushnil(L);
257 lua_pushstring(L, err);
258 return 2;
259 }
260 /* turn master object into a client object */
261 auxiliar_setclass(L, "unix{client}", 1);
262 lua_pushnumber(L, 1);
263 return 1;
264}
265 56
266/*-------------------------------------------------------------------------*\ 57 /* Add backwards compatibility aliases "tcp" and "udp" for the "stream" and
267* Closes socket used by object 58 * "dgram" functions. */
268\*-------------------------------------------------------------------------*/ 59 add_alias(L, socket_unix_table, "tcp", "stream");
269static int meth_close(lua_State *L) 60 add_alias(L, socket_unix_table, "udp", "dgram");
270{
271 p_unix un = (p_unix) auxiliar_checkgroup(L, "unix{any}", 1);
272 socket_destroy(&un->sock);
273 lua_pushnumber(L, 1);
274 return 1;
275}
276 61
277/*-------------------------------------------------------------------------*\ 62 /* Add a backwards compatibility function and a metatable setup to call it
278* Puts the sockt in listen mode 63 * for the old socket.unix() interface. */
279\*-------------------------------------------------------------------------*/ 64 lua_pushcfunction(L, compat_socket_unix_call);
280static int meth_listen(lua_State *L) 65 lua_setfield(L, socket_unix_table, "__call");
281{ 66 lua_pushvalue(L, socket_unix_table);
282 p_unix un = (p_unix) auxiliar_checkclass(L, "unix{master}", 1); 67 lua_setmetatable(L, socket_unix_table);
283 int backlog = (int) luaL_optnumber(L, 2, 32);
284 int err = socket_listen(&un->sock, backlog);
285 if (err != IO_DONE) {
286 lua_pushnil(L);
287 lua_pushstring(L, socket_strerror(err));
288 return 2;
289 }
290 /* turn master object into a server object */
291 auxiliar_setclass(L, "unix{server}", 1);
292 lua_pushnumber(L, 1);
293 return 1;
294}
295 68
296/*-------------------------------------------------------------------------*\
297* Shuts the connection down partially
298\*-------------------------------------------------------------------------*/
299static int meth_shutdown(lua_State *L)
300{
301 /* SHUT_RD, SHUT_WR, SHUT_RDWR have the value 0, 1, 2, so we can use method index directly */
302 static const char* methods[] = { "receive", "send", "both", NULL };
303 p_unix tcp = (p_unix) auxiliar_checkclass(L, "unix{client}", 1);
304 int how = luaL_checkoption(L, 2, "both", methods);
305 socket_shutdown(&tcp->sock, how);
306 lua_pushnumber(L, 1);
307 return 1; 69 return 1;
308} 70}
309
310/*-------------------------------------------------------------------------*\
311* Just call tm methods
312\*-------------------------------------------------------------------------*/
313static int meth_settimeout(lua_State *L) {
314 p_unix un = (p_unix) auxiliar_checkgroup(L, "unix{any}", 1);
315 return timeout_meth_settimeout(L, &un->tm);
316}
317
318/*=========================================================================*\
319* Library functions
320\*=========================================================================*/
321/*-------------------------------------------------------------------------*\
322* Creates a master unix object
323\*-------------------------------------------------------------------------*/
324static int global_create(lua_State *L) {
325 t_socket sock;
326 int err = socket_create(&sock, AF_UNIX, SOCK_STREAM, 0);
327 /* try to allocate a system socket */
328 if (err == IO_DONE) {
329 /* allocate unix object */
330 p_unix un = (p_unix) lua_newuserdata(L, sizeof(t_unix));
331 /* set its type as master object */
332 auxiliar_setclass(L, "unix{master}", -1);
333 /* initialize remaining structure fields */
334 socket_setnonblocking(&sock);
335 un->sock = sock;
336 io_init(&un->io, (p_send) socket_send, (p_recv) socket_recv,
337 (p_error) socket_ioerror, &un->sock);
338 timeout_init(&un->tm, -1, -1);
339 buffer_init(&un->buf, &un->io, &un->tm);
340 return 1;
341 } else {
342 lua_pushnil(L);
343 lua_pushstring(L, socket_strerror(err));
344 return 2;
345 }
346}
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