summaryrefslogtreecommitdiff
path: root/Build/source/texk/web2c/luatexdir/luasocket/src/usocket.c
blob: 6f7b75dc0ae58d337afcf1e4c1157c21dce2caae (plain)
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
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
/*=========================================================================*\
* Socket compatibilization module for Unix
* LuaSocket toolkit
*
* The code is now interrupt-safe.
* The penalty of calling select to avoid busy-wait is only paid when
* the I/O call fail in the first place.
\*=========================================================================*/
#include <string.h>
#include <signal.h>

#include "socket.h"
#include "pierror.h"

/*-------------------------------------------------------------------------*\
* Wait for readable/writable/connected socket with timeout
\*-------------------------------------------------------------------------*/
#ifndef SOCKET_SELECT
#include <sys/poll.h>

#define WAITFD_R        POLLIN
#define WAITFD_W        POLLOUT
#define WAITFD_C        (POLLIN|POLLOUT)
int socket_waitfd(p_socket ps, int sw, p_timeout tm) {
    int ret;
    struct pollfd pfd;
    pfd.fd = *ps;
    pfd.events = sw;
    pfd.revents = 0;
    if (timeout_iszero(tm)) return IO_TIMEOUT;  /* optimize timeout == 0 case */
    do {
        int t = (int)(timeout_getretry(tm)*1e3);
        ret = poll(&pfd, 1, t >= 0? t: -1);
    } while (ret == -1 && errno == EINTR);
    if (ret == -1) return errno;
    if (ret == 0) return IO_TIMEOUT;
    if (sw == WAITFD_C && (pfd.revents & (POLLIN|POLLERR))) return IO_CLOSED;
    return IO_DONE;
}
#else

#define WAITFD_R        1
#define WAITFD_W        2
#define WAITFD_C        (WAITFD_R|WAITFD_W)

int socket_waitfd(p_socket ps, int sw, p_timeout tm) {
    int ret;
    fd_set rfds, wfds, *rp, *wp;
    struct timeval tv, *tp;
    double t;
    if (*ps >= FD_SETSIZE) return EINVAL;
    if (timeout_iszero(tm)) return IO_TIMEOUT;  /* optimize timeout == 0 case */
    do {
        /* must set bits within loop, because select may have modifed them */
        rp = wp = NULL;
        if (sw & WAITFD_R) { FD_ZERO(&rfds); FD_SET(*ps, &rfds); rp = &rfds; }
        if (sw & WAITFD_W) { FD_ZERO(&wfds); FD_SET(*ps, &wfds); wp = &wfds; }
        t = timeout_getretry(tm);
        tp = NULL;
        if (t >= 0.0) {
            tv.tv_sec = (int)t;
            tv.tv_usec = (int)((t-tv.tv_sec)*1.0e6);
            tp = &tv;
        }
        ret = select(*ps+1, rp, wp, NULL, tp);
    } while (ret == -1 && errno == EINTR);
    if (ret == -1) return errno;
    if (ret == 0) return IO_TIMEOUT;
    if (sw == WAITFD_C && FD_ISSET(*ps, &rfds)) return IO_CLOSED;
    return IO_DONE;
}
#endif


/*-------------------------------------------------------------------------*\
* Initializes module
\*-------------------------------------------------------------------------*/
int socket_open(void) {
    /* installs a handler to ignore sigpipe or it will crash us */
    signal(SIGPIPE, SIG_IGN);
    return 1;
}

/*-------------------------------------------------------------------------*\
* Close module
\*-------------------------------------------------------------------------*/
int socket_close(void) {
    return 1;
}

/*-------------------------------------------------------------------------*\
* Close and inutilize socket
\*-------------------------------------------------------------------------*/
void socket_destroy(p_socket ps) {
    if (*ps != SOCKET_INVALID) {
        close(*ps);
        *ps = SOCKET_INVALID;
    }
}

/*-------------------------------------------------------------------------*\
* Select with timeout control
\*-------------------------------------------------------------------------*/
int socket_select(t_socket n, fd_set *rfds, fd_set *wfds, fd_set *efds,
        p_timeout tm) {
    int ret;
    do {
        struct timeval tv;
        double t = timeout_getretry(tm);
        tv.tv_sec = (int) t;
        tv.tv_usec = (int) ((t - tv.tv_sec) * 1.0e6);
        /* timeout = 0 means no wait */
        ret = select(n, rfds, wfds, efds, t >= 0.0 ? &tv: NULL);
    } while (ret < 0 && errno == EINTR);
    return ret;
}

/*-------------------------------------------------------------------------*\
* Creates and sets up a socket
\*-------------------------------------------------------------------------*/
int socket_create(p_socket ps, int domain, int type, int protocol) {
    *ps = socket(domain, type, protocol);
    if (*ps != SOCKET_INVALID) return IO_DONE;
    else return errno;
}

/*-------------------------------------------------------------------------*\
* Binds or returns error message
\*-------------------------------------------------------------------------*/
int socket_bind(p_socket ps, SA *addr, socklen_t len) {
    int err = IO_DONE;
    socket_setblocking(ps);
    if (bind(*ps, addr, len) < 0) err = errno;
    socket_setnonblocking(ps);
    return err;
}

/*-------------------------------------------------------------------------*\
*
\*-------------------------------------------------------------------------*/
int socket_listen(p_socket ps, int backlog) {
    int err = IO_DONE;
    if (listen(*ps, backlog)) err = errno;
    return err;
}

/*-------------------------------------------------------------------------*\
*
\*-------------------------------------------------------------------------*/
void socket_shutdown(p_socket ps, int how) {
    shutdown(*ps, how);
}

/*-------------------------------------------------------------------------*\
* Connects or returns error message
\*-------------------------------------------------------------------------*/
int socket_connect(p_socket ps, SA *addr, socklen_t len, p_timeout tm) {
    int err;
    /* avoid calling on closed sockets */
    if (*ps == SOCKET_INVALID) return IO_CLOSED;
    /* call connect until done or failed without being interrupted */
    do if (connect(*ps, addr, len) == 0) return IO_DONE;
    while ((err = errno) == EINTR);
    /* if connection failed immediately, return error code */
    if (err != EINPROGRESS && err != EAGAIN) return err;
    /* zero timeout case optimization */
    if (timeout_iszero(tm)) return IO_TIMEOUT;
    /* wait until we have the result of the connection attempt or timeout */
    err = socket_waitfd(ps, WAITFD_C, tm);
    if (err == IO_CLOSED) {
        if (recv(*ps, (char *) &err, 0, 0) == 0) return IO_DONE;
        else return errno;
    } else return err;
}

/*-------------------------------------------------------------------------*\
* Accept with timeout
\*-------------------------------------------------------------------------*/
int socket_accept(p_socket ps, p_socket pa, SA *addr, socklen_t *len, p_timeout tm) {
    if (*ps == SOCKET_INVALID) return IO_CLOSED;
    for ( ;; ) {
        int err;
        if ((*pa = accept(*ps, addr, len)) != SOCKET_INVALID) return IO_DONE;
        err = errno;
        if (err == EINTR) continue;
        if (err != EAGAIN && err != ECONNABORTED) return err;
        if ((err = socket_waitfd(ps, WAITFD_R, tm)) != IO_DONE) return err;
    }
    /* can't reach here */
    return IO_UNKNOWN;
}

/*-------------------------------------------------------------------------*\
* Send with timeout
\*-------------------------------------------------------------------------*/
int socket_send(p_socket ps, const char *data, size_t count,
        size_t *sent, p_timeout tm)
{
    int err;
    *sent = 0;
    /* avoid making system calls on closed sockets */
    if (*ps == SOCKET_INVALID) return IO_CLOSED;
    /* loop until we send something or we give up on error */
    for ( ;; ) {
        long put = (long) send(*ps, data, count, 0);
        /* if we sent anything, we are done */
        if (put >= 0) {
            *sent = put;
            return IO_DONE;
        }
        err = errno;
        /* EPIPE means the connection was closed */
        if (err == EPIPE) return IO_CLOSED;
        /* EPROTOTYPE means the connection is being closed (on Yosemite!)*/
        if (err == EPROTOTYPE) continue;
        /* we call was interrupted, just try again */
        if (err == EINTR) continue;
        /* if failed fatal reason, report error */
        if (err != EAGAIN) return err;
        /* wait until we can send something or we timeout */
        if ((err = socket_waitfd(ps, WAITFD_W, tm)) != IO_DONE) return err;
    }
    /* can't reach here */
    return IO_UNKNOWN;
}

/*-------------------------------------------------------------------------*\
* Sendto with timeout
\*-------------------------------------------------------------------------*/
int socket_sendto(p_socket ps, const char *data, size_t count, size_t *sent,
        SA *addr, socklen_t len, p_timeout tm)
{
    int err;
    *sent = 0;
    if (*ps == SOCKET_INVALID) return IO_CLOSED;
    for ( ;; ) {
        long put = (long) sendto(*ps, data, count, 0, addr, len); 
        if (put >= 0) {
            *sent = put;
            return IO_DONE;
        }
        err = errno;
        if (err == EPIPE) return IO_CLOSED;
        if (err == EPROTOTYPE) continue;
        if (err == EINTR) continue;
        if (err != EAGAIN) return err;
        if ((err = socket_waitfd(ps, WAITFD_W, tm)) != IO_DONE) return err;
    }
    return IO_UNKNOWN;
}

/*-------------------------------------------------------------------------*\
* Receive with timeout
\*-------------------------------------------------------------------------*/
int socket_recv(p_socket ps, char *data, size_t count, size_t *got, p_timeout tm) {
    int err;
    *got = 0;
    if (*ps == SOCKET_INVALID) return IO_CLOSED;
    for ( ;; ) {
        long taken = (long) recv(*ps, data, count, 0);
        if (taken > 0) {
            *got = taken;
            return IO_DONE;
        }
        err = errno;
        if (taken == 0) return IO_CLOSED;
        if (err == EINTR) continue;
        if (err != EAGAIN) return err;
        if ((err = socket_waitfd(ps, WAITFD_R, tm)) != IO_DONE) return err;
    }
    return IO_UNKNOWN;
}

/*-------------------------------------------------------------------------*\
* Recvfrom with timeout
\*-------------------------------------------------------------------------*/
int socket_recvfrom(p_socket ps, char *data, size_t count, size_t *got,
        SA *addr, socklen_t *len, p_timeout tm) {
    int err;
    *got = 0;
    if (*ps == SOCKET_INVALID) return IO_CLOSED;
    for ( ;; ) {
        long taken = (long) recvfrom(*ps, data, count, 0, addr, len);
        if (taken > 0) {
            *got = taken;
            return IO_DONE;
        }
        err = errno;
        if (taken == 0) return IO_CLOSED;
        if (err == EINTR) continue;
        if (err != EAGAIN) return err;
        if ((err = socket_waitfd(ps, WAITFD_R, tm)) != IO_DONE) return err;
    }
    return IO_UNKNOWN;
}


/*-------------------------------------------------------------------------*\
* Write with timeout
*
* socket_read and socket_write are cut-n-paste of socket_send and socket_recv,
* with send/recv replaced with write/read. We can't just use write/read
* in the socket version, because behaviour when size is zero is different.
\*-------------------------------------------------------------------------*/
int socket_write(p_socket ps, const char *data, size_t count,
        size_t *sent, p_timeout tm)
{
    int err;
    *sent = 0;
    /* avoid making system calls on closed sockets */
    if (*ps == SOCKET_INVALID) return IO_CLOSED;
    /* loop until we send something or we give up on error */
    for ( ;; ) {
        long put = (long) write(*ps, data, count);
        /* if we sent anything, we are done */
        if (put >= 0) {
            *sent = put;
            return IO_DONE;
        }
        err = errno;
        /* EPIPE means the connection was closed */
        if (err == EPIPE) return IO_CLOSED;
        /* EPROTOTYPE means the connection is being closed (on Yosemite!)*/
        if (err == EPROTOTYPE) continue;
        /* we call was interrupted, just try again */
        if (err == EINTR) continue;
        /* if failed fatal reason, report error */
        if (err != EAGAIN) return err;
        /* wait until we can send something or we timeout */
        if ((err = socket_waitfd(ps, WAITFD_W, tm)) != IO_DONE) return err;
    }
    /* can't reach here */
    return IO_UNKNOWN;
}

/*-------------------------------------------------------------------------*\
* Read with timeout
* See note for socket_write
\*-------------------------------------------------------------------------*/
int socket_read(p_socket ps, char *data, size_t count, size_t *got, p_timeout tm) {
    int err;
    *got = 0;
    if (*ps == SOCKET_INVALID) return IO_CLOSED;
    for ( ;; ) {
        long taken = (long) read(*ps, data, count);
        if (taken > 0) {
            *got = taken;
            return IO_DONE;
        }
        err = errno;
        if (taken == 0) return IO_CLOSED;
        if (err == EINTR) continue;
        if (err != EAGAIN) return err;
        if ((err = socket_waitfd(ps, WAITFD_R, tm)) != IO_DONE) return err;
    }
    return IO_UNKNOWN;
}

/*-------------------------------------------------------------------------*\
* Put socket into blocking mode
\*-------------------------------------------------------------------------*/
void socket_setblocking(p_socket ps) {
    int flags = fcntl(*ps, F_GETFL, 0);
    flags &= (~(O_NONBLOCK));
    fcntl(*ps, F_SETFL, flags);
}

/*-------------------------------------------------------------------------*\
* Put socket into non-blocking mode
\*-------------------------------------------------------------------------*/
void socket_setnonblocking(p_socket ps) {
    int flags = fcntl(*ps, F_GETFL, 0);
    flags |= O_NONBLOCK;
    fcntl(*ps, F_SETFL, flags);
}

/*-------------------------------------------------------------------------*\
* DNS helpers
\*-------------------------------------------------------------------------*/
int socket_gethostbyaddr(const char *addr, socklen_t len, struct hostent **hp) {
    *hp = gethostbyaddr(addr, len, AF_INET);
    if (*hp) return IO_DONE;
    else if (h_errno) return h_errno;
    else if (errno) return errno;
    else return IO_UNKNOWN;
}

int socket_gethostbyname(const char *addr, struct hostent **hp) {
    *hp = gethostbyname(addr);
    if (*hp) return IO_DONE;
    else if (h_errno) return h_errno;
    else if (errno) return errno;
    else return IO_UNKNOWN;
}

/*-------------------------------------------------------------------------*\
* Error translation functions
* Make sure important error messages are standard
\*-------------------------------------------------------------------------*/
const char *socket_hoststrerror(int err) {
    if (err <= 0) return io_strerror(err);
    switch (err) {
        case HOST_NOT_FOUND: return PIE_HOST_NOT_FOUND;
        default: return hstrerror(err);
    }
}

const char *socket_strerror(int err) {
    if (err <= 0) return io_strerror(err);
    switch (err) {
        case EADDRINUSE: return PIE_ADDRINUSE;
        case EISCONN: return PIE_ISCONN;
        case EACCES: return PIE_ACCESS;
        case ECONNREFUSED: return PIE_CONNREFUSED;
        case ECONNABORTED: return PIE_CONNABORTED;
        case ECONNRESET: return PIE_CONNRESET;
        case ETIMEDOUT: return PIE_TIMEDOUT;
        default: {
            return strerror(err);
        }
    }
}

const char *socket_ioerror(p_socket ps, int err) {
    (void) ps;
    return socket_strerror(err);
}

const char *socket_gaistrerror(int err) {
    if (err == 0) return NULL;
    switch (err) {
        case EAI_AGAIN: return PIE_AGAIN;
        case EAI_BADFLAGS: return PIE_BADFLAGS;
#ifdef EAI_BADHINTS
        case EAI_BADHINTS: return PIE_BADHINTS;
#endif
        case EAI_FAIL: return PIE_FAIL;
        case EAI_FAMILY: return PIE_FAMILY;
        case EAI_MEMORY: return PIE_MEMORY;
        case EAI_NONAME: return PIE_NONAME;
#ifdef EAI_OVERFLOW
        case EAI_OVERFLOW: return PIE_OVERFLOW;
#endif
#ifdef EAI_PROTOCOL
        case EAI_PROTOCOL: return PIE_PROTOCOL;
#endif
        case EAI_SERVICE: return PIE_SERVICE;
        case EAI_SOCKTYPE: return PIE_SOCKTYPE;
        case EAI_SYSTEM: return strerror(errno);
        default: return gai_strerror(err);
    }
}