about summary refs log tree commit diff stats
path: root/src/luasocket/unixdgram.c
blob: 3ac3c5e0272705a95d49da9f9afe6fd77513e64f (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
/*=========================================================================*\
* Unix domain socket dgram submodule
* LuaSocket toolkit
\*=========================================================================*/
#include "luasocket.h"

#include "auxiliar.h"
#include "socket.h"
#include "options.h"
#include "unix.h"

#include <string.h>
#include <stdlib.h>

#include <sys/un.h>

#define UNIXDGRAM_DATAGRAMSIZE 8192

// provide a SUN_LEN macro if sys/un.h doesn't (e.g. Android)
#ifndef SUN_LEN
#define SUN_LEN(ptr) \
  ((size_t) (((struct sockaddr_un *) 0)->sun_path)  \
   + strlen ((ptr)->sun_path))
#endif

/*=========================================================================*\
* Internal function prototypes
\*=========================================================================*/
static int global_create(lua_State *L);
static int meth_connect(lua_State *L);
static int meth_bind(lua_State *L);
static int meth_send(lua_State *L);
static int meth_receive(lua_State *L);
static int meth_close(lua_State *L);
static int meth_setoption(lua_State *L);
static int meth_settimeout(lua_State *L);
static int meth_gettimeout(lua_State *L);
static int meth_getfd(lua_State *L);
static int meth_setfd(lua_State *L);
static int meth_dirty(lua_State *L);
static int meth_receivefrom(lua_State *L);
static int meth_sendto(lua_State *L);
static int meth_getsockname(lua_State *L);

static const char *unixdgram_tryconnect(p_unix un, const char *path);
static const char *unixdgram_trybind(p_unix un, const char *path);

/* unixdgram object methods */
static luaL_Reg unixdgram_methods[] = {
    {"__gc",        meth_close},
    {"__tostring",  auxiliar_tostring},
    {"bind",        meth_bind},
    {"close",       meth_close},
    {"connect",     meth_connect},
    {"dirty",       meth_dirty},
    {"getfd",       meth_getfd},
    {"send",        meth_send},
    {"sendto",      meth_sendto},
    {"receive",     meth_receive},
    {"receivefrom", meth_receivefrom},
    {"setfd",       meth_setfd},
    {"setoption",   meth_setoption},
    {"setpeername", meth_connect},
    {"setsockname", meth_bind},
    {"getsockname", meth_getsockname},
    {"settimeout",  meth_settimeout},
    {"gettimeout",  meth_gettimeout},
    {NULL,          NULL}
};

/* socket option handlers */
static t_opt optset[] = {
    {"reuseaddr",   opt_set_reuseaddr},
    {NULL,          NULL}
};

/* functions in library namespace */
static luaL_Reg func[] = {
    {"dgram", global_create},
    {NULL, NULL}
};

/*-------------------------------------------------------------------------*\
* Initializes module
\*-------------------------------------------------------------------------*/
int unixdgram_open(lua_State *L)
{
    /* create classes */
    auxiliar_newclass(L, "unixdgram{connected}", unixdgram_methods);
    auxiliar_newclass(L, "unixdgram{unconnected}", unixdgram_methods);
    /* create class groups */
    auxiliar_add2group(L, "unixdgram{connected}",   "unixdgram{any}");
    auxiliar_add2group(L, "unixdgram{unconnected}", "unixdgram{any}");
    auxiliar_add2group(L, "unixdgram{connected}",   "select{able}");
    auxiliar_add2group(L, "unixdgram{unconnected}", "select{able}");

    luaL_setfuncs(L, func, 0);
    return 0;
}

/*=========================================================================*\
* Lua methods
\*=========================================================================*/
static const char *unixdgram_strerror(int err)
{
    /* a 'closed' error on an unconnected means the target address was not
     * accepted by the transport layer */
    if (err == IO_CLOSED) return "refused";
    else return socket_strerror(err);
}

static int meth_send(lua_State *L)
{
    p_unix un = (p_unix) auxiliar_checkclass(L, "unixdgram{connected}", 1);
    p_timeout tm = &un->tm;
    size_t count, sent = 0;
    int err;
    const char *data = luaL_checklstring(L, 2, &count);
    timeout_markstart(tm);
    err = socket_send(&un->sock, data, count, &sent, tm);
    if (err != IO_DONE) {
        lua_pushnil(L);
        lua_pushstring(L, unixdgram_strerror(err));
        return 2;
    }
    lua_pushnumber(L, (lua_Number) sent);
    return 1;
}

/*-------------------------------------------------------------------------*\
* Send data through unconnected unixdgram socket
\*-------------------------------------------------------------------------*/
static int meth_sendto(lua_State *L)
{
    p_unix un = (p_unix) auxiliar_checkclass(L, "unixdgram{unconnected}", 1);
    size_t count, sent = 0;
    const char *data = luaL_checklstring(L, 2, &count);
    const char *path = luaL_checkstring(L, 3);
    p_timeout tm = &un->tm;
    int err;
    struct sockaddr_un remote;
    size_t len = strlen(path);

    if (len >= sizeof(remote.sun_path)) {
		lua_pushnil(L);
		lua_pushstring(L, "path too long");
		return 2;
	}

    memset(&remote, 0, sizeof(remote));
    strcpy(remote.sun_path, path);
    remote.sun_family = AF_UNIX;
    timeout_markstart(tm);
#ifdef UNIX_HAS_SUN_LEN
    remote.sun_len = sizeof(remote.sun_family) + sizeof(remote.sun_len)
        + len + 1;
    err = socket_sendto(&un->sock, data, count, &sent, (SA *) &remote, remote.sun_len, tm);
#else
    err = socket_sendto(&un->sock, data, count, &sent, (SA *) &remote,
		   	sizeof(remote.sun_family) + len, tm);
#endif
    if (err != IO_DONE) {
        lua_pushnil(L);
        lua_pushstring(L, unixdgram_strerror(err));
        return 2;
    }
    lua_pushnumber(L, (lua_Number) sent);
    return 1;
}

static int meth_receive(lua_State *L) {
    p_unix un = (p_unix) auxiliar_checkgroup(L, "unixdgram{any}", 1);
    char buf[UNIXDGRAM_DATAGRAMSIZE];
    size_t got, wanted = (size_t) luaL_optnumber(L, 2, sizeof(buf));
    char *dgram = wanted > sizeof(buf)? (char *) malloc(wanted): buf;
    int err;
    p_timeout tm = &un->tm;
    timeout_markstart(tm);
    if (!dgram) {
        lua_pushnil(L);
        lua_pushliteral(L, "out of memory");
        return 2;
    }
    err = socket_recv(&un->sock, dgram, wanted, &got, tm);
    /* Unlike STREAM, recv() of zero is not closed, but a zero-length packet. */
    if (err != IO_DONE && err != IO_CLOSED) {
        lua_pushnil(L);
        lua_pushstring(L, unixdgram_strerror(err));
        if (wanted > sizeof(buf)) free(dgram);
        return 2;
    }
    lua_pushlstring(L, dgram, got);
    if (wanted > sizeof(buf)) free(dgram);
    return 1;
}

/*-------------------------------------------------------------------------*\
* Receives data and sender from a DGRAM socket
\*-------------------------------------------------------------------------*/
static int meth_receivefrom(lua_State *L) {
    p_unix un = (p_unix) auxiliar_checkclass(L, "unixdgram{unconnected}", 1);
    char buf[UNIXDGRAM_DATAGRAMSIZE];
    size_t got, wanted = (size_t) luaL_optnumber(L, 2, sizeof(buf));
    char *dgram = wanted > sizeof(buf)? (char *) malloc(wanted): buf;
    struct sockaddr_un addr;
    socklen_t addr_len = sizeof(addr);
    int err;
    p_timeout tm = &un->tm;
    timeout_markstart(tm);
    if (!dgram) {
        lua_pushnil(L);
        lua_pushliteral(L, "out of memory");
        return 2;
    }
    addr.sun_path[0] = '\0';
    err = socket_recvfrom(&un->sock, dgram, wanted, &got, (SA *) &addr,
            &addr_len, tm);
    /* Unlike STREAM, recv() of zero is not closed, but a zero-length packet. */
    if (err != IO_DONE && err != IO_CLOSED) {
        lua_pushnil(L);
        lua_pushstring(L, unixdgram_strerror(err));
        if (wanted > sizeof(buf)) free(dgram);
        return 2;
    }

    lua_pushlstring(L, dgram, got);
	/* the path may be empty, when client send without bind */
    lua_pushstring(L, addr.sun_path);
    if (wanted > sizeof(buf)) free(dgram);
    return 2;
}

/*-------------------------------------------------------------------------*\
* Just call option handler
\*-------------------------------------------------------------------------*/
static int meth_setoption(lua_State *L) {
    p_unix un = (p_unix) auxiliar_checkgroup(L, "unixdgram{any}", 1);
    return opt_meth_setoption(L, optset, &un->sock);
}

/*-------------------------------------------------------------------------*\
* Select support methods
\*-------------------------------------------------------------------------*/
static int meth_getfd(lua_State *L) {
    p_unix un = (p_unix) auxiliar_checkgroup(L, "unixdgram{any}", 1);
    lua_pushnumber(L, (int) un->sock);
    return 1;
}

/* this is very dangerous, but can be handy for those that are brave enough */
static int meth_setfd(lua_State *L) {
    p_unix un = (p_unix) auxiliar_checkgroup(L, "unixdgram{any}", 1);
    un->sock = (t_socket) luaL_checknumber(L, 2);
    return 0;
}

static int meth_dirty(lua_State *L) {
    p_unix un = (p_unix) auxiliar_checkgroup(L, "unixdgram{any}", 1);
    (void) un;
    lua_pushboolean(L, 0);
    return 1;
}

/*-------------------------------------------------------------------------*\
* Binds an object to an address
\*-------------------------------------------------------------------------*/
static const char *unixdgram_trybind(p_unix un, const char *path) {
    struct sockaddr_un local;
    size_t len = strlen(path);
    if (len >= sizeof(local.sun_path)) return "path too long";
    memset(&local, 0, sizeof(local));
    strcpy(local.sun_path, path);
    local.sun_family = AF_UNIX;
    size_t addrlen = SUN_LEN(&local);
#ifdef UNIX_HAS_SUN_LEN
    local.sun_len = addrlen + 1;
#endif
    int err = socket_bind(&un->sock, (SA *) &local, addrlen);
    if (err != IO_DONE) socket_destroy(&un->sock);
    return socket_strerror(err);
}

static int meth_bind(lua_State *L)
{
    p_unix un = (p_unix) auxiliar_checkclass(L, "unixdgram{unconnected}", 1);
    const char *path =  luaL_checkstring(L, 2);
    const char *err = unixdgram_trybind(un, path);
    if (err) {
        lua_pushnil(L);
        lua_pushstring(L, err);
        return 2;
    }
    lua_pushnumber(L, 1);
    return 1;
}

static int meth_getsockname(lua_State *L)
{
    p_unix un = (p_unix) auxiliar_checkgroup(L, "unixdgram{any}", 1);
    struct sockaddr_un peer = {0};
    socklen_t peer_len = sizeof(peer);

    if (getsockname(un->sock, (SA *) &peer, &peer_len) < 0) {
        lua_pushnil(L);
        lua_pushstring(L, socket_strerror(errno));
        return 2;
    }

    lua_pushstring(L, peer.sun_path);
    return 1;
}

/*-------------------------------------------------------------------------*\
* Turns a master unixdgram object into a client object.
\*-------------------------------------------------------------------------*/
static const char *unixdgram_tryconnect(p_unix un, const char *path)
{
    struct sockaddr_un remote;
    size_t len = strlen(path);
    if (len >= sizeof(remote.sun_path)) return "path too long";
    memset(&remote, 0, sizeof(remote));
    strcpy(remote.sun_path, path);
    remote.sun_family = AF_UNIX;
    timeout_markstart(&un->tm);
    size_t addrlen = SUN_LEN(&remote);
#ifdef UNIX_HAS_SUN_LEN
    remote.sun_len = addrlen + 1;
#endif
    int err = socket_connect(&un->sock, (SA *) &remote, addrlen, &un->tm);
    if (err != IO_DONE) socket_destroy(&un->sock);
    return socket_strerror(err);
}

static int meth_connect(lua_State *L)
{
    p_unix un = (p_unix) auxiliar_checkgroup(L, "unixdgram{any}", 1);
    const char *path =  luaL_checkstring(L, 2);
    const char *err = unixdgram_tryconnect(un, path);
    if (err) {
        lua_pushnil(L);
        lua_pushstring(L, err);
        return 2;
    }
    /* turn unconnected object into a connected object */
    auxiliar_setclass(L, "unixdgram{connected}", 1);
    lua_pushnumber(L, 1);
    return 1;
}

/*-------------------------------------------------------------------------*\
* Closes socket used by object
\*-------------------------------------------------------------------------*/
static int meth_close(lua_State *L)
{
    p_unix un = (p_unix) auxiliar_checkgroup(L, "unixdgram{any}", 1);
    socket_destroy(&un->sock);
    lua_pushnumber(L, 1);
    return 1;
}

/*-------------------------------------------------------------------------*\
* Just call tm methods
\*-------------------------------------------------------------------------*/
static int meth_settimeout(lua_State *L)
{
    p_unix un = (p_unix) auxiliar_checkgroup(L, "unixdgram{any}", 1);
    return timeout_meth_settimeout(L, &un->tm);
}

static int meth_gettimeout(lua_State *L)
{
    p_unix un = (p_unix) auxiliar_checkgroup(L, "unixdgram{any}", 1);
    return timeout_meth_gettimeout(L, &un->tm);
}

/*=========================================================================*\
* Library functions
\*=========================================================================*/
/*-------------------------------------------------------------------------*\
* Creates a master unixdgram object
\*-------------------------------------------------------------------------*/
static int global_create(lua_State *L)
{
    t_socket sock;
    int err = socket_create(&sock, AF_UNIX, SOCK_DGRAM, 0);
    /* try to allocate a system socket */
    if (err == IO_DONE) {
        /* allocate unixdgram object */
        p_unix un = (p_unix) lua_newuserdata(L, sizeof(t_unix));
        /* set its type as master object */
        auxiliar_setclass(L, "unixdgram{unconnected}", -1);
        /* initialize remaining structure fields */
        socket_setnonblocking(&sock);
        un->sock = sock;
        io_init(&un->io, (p_send) socket_send, (p_recv) socket_recv,
                (p_error) socket_ioerror, &un->sock);
        timeout_init(&un->tm, -1, -1);
        buffer_init(&un->buf, &un->io, &un->tm);
        return 1;
    } else {
        lua_pushnil(L);
        lua_pushstring(L, socket_strerror(err));
        return 2;
    }
}