fserve.c 12.6 KB
Newer Older
1
2
3
4
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
5
6

#ifdef HAVE_POLL
7
#include <sys/poll.h>
8
#endif
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

#ifndef _WIN32
#include <unistd.h>
#include <sys/time.h>
#include <sys/socket.h>
#else
#include <winsock2.h>
#include <windows.h>
#endif

#include "thread.h"
#include "avl.h"
#include "httpp.h"
#include "sock.h"

#include "connection.h"
#include "global.h"
#include "refbuf.h"
#include "client.h"
#include "stats.h"
#include "format.h"
#include "log.h"
#include "logging.h"
#include "config.h"
#include "util.h"

#include "fserve.h"

#undef CATMODULE
#define CATMODULE "fserve"

#define BUFSIZE 4096

42
43
44
45
46
47
#ifdef _WIN32
#define MIMETYPESFILE ".\\mime.types"
#else
#define MIMETYPESFILE "/etc/mime.types"
#endif

48
49
static avl_tree *client_tree;
static avl_tree *pending_tree;
50
static avl_tree *mimetypes = NULL;
51
52

static cond_t fserv_cond;
53
static thread_type *fserv_thread;
54
static int run_fserv;
55
56
57
static int fserve_clients;
static int client_tree_changed=0;

58
#ifdef HAVE_POLL
59
60
static struct pollfd *ufds = NULL;
static int ufdssize = 0;
61
62
63
64
#else
static fd_set fds;
static int fd_max = 0;
#endif
65

66
67
68
69
70
typedef struct {
    char *ext;
    char *type;
} mime_type;

71
72
73
74
/* avl tree helper */
static int _compare_clients(void *compare_arg, void *a, void *b);
static int _remove_client(void *key);
static int _free_client(void *key);
75
76
77
static int _delete_mapping(void *mapping);
static void *fserv_thread_function(void *arg);
static void create_mime_mappings(char *fn);
78
79
80
81
82
83

void fserve_initialize(void)
{
    if(!config_get_config()->fileserve)
        return;

84
85
    create_mime_mappings(MIMETYPESFILE);

86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
	client_tree = avl_tree_new(_compare_clients, NULL);
	pending_tree = avl_tree_new(_compare_clients, NULL);
    thread_cond_create(&fserv_cond);

    run_fserv = 1;

    fserv_thread = thread_create("File Serving Thread", 
            fserv_thread_function, NULL, THREAD_ATTACHED);
}

void fserve_shutdown(void)
{
    if(!config_get_config()->fileserve)
        return;

101
102
103
    if(!run_fserv)
        return;

104
105
    avl_tree_free(mimetypes, _delete_mapping);

106
107
108
109
110
111
112
113
114
    run_fserv = 0;
    thread_cond_signal(&fserv_cond);
    thread_join(fserv_thread);

    thread_cond_destroy(&fserv_cond);
    avl_tree_free(client_tree, _free_client);
    avl_tree_free(pending_tree, _free_client);
}

115
116
117
118
119
120
static void wait_for_fds() {
    avl_node *client_node;
    fserve_t *client;
    int i;

    while(run_fserv) {
121
#ifdef HAVE_POLL
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
        if(client_tree_changed) {
            client_tree_changed = 0;
            i = 0;
            ufdssize = fserve_clients;
            ufds = realloc(ufds, ufdssize * sizeof(struct pollfd));
            avl_tree_rlock(client_tree);
            client_node = avl_get_first(client_tree);
            while(client_node) {
                client = client_node->key;
                ufds[i].fd = client->client->con->sock;
                ufds[i].events = POLLOUT;
                client_node = avl_get_next(client_node);
            }
            avl_tree_unlock(client_tree);
        }

138
        if(poll(ufds, ufdssize, 200) > 0)
139
            return;
140
141
#else
        struct timeval tv;
142
        fd_set realfds;
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
        tv.tv_sec = 0;
        tv.tv_usec = 200000;
        if(client_tree_changed) {
            client_tree_changed = 0;
            i=0;
            FD_ZERO(&fds);
            fd_max = 0;
            avl_tree_rlock(client_tree);
            client_node = avl_get_first(client_tree);
            while(client_node) {
                client = client_node->key;
                FD_SET(client->client->con->sock, &fds);
                if(client->client->con->sock > fd_max)
                    fd_max = client->client->con->sock;
                client_node = avl_get_next(client_node);
            }
            avl_tree_unlock(client_tree);
160
        }
161

162
163
        memcpy(&realfds, &fds, sizeof(fd_set));
        if(select(fd_max+1, NULL, &realfds, NULL, &tv) > 0)
164
165
            return;
#endif
166
167
168
169
170
171
172
173
174
175
        else {
            avl_tree_rlock(pending_tree);
            client_node = avl_get_first(pending_tree);
            avl_tree_unlock(pending_tree);
            if(client_node)
                return;
        }
    }
}

176
static void *fserv_thread_function(void *arg)
177
178
179
180
181
182
183
184
185
186
{
    avl_node *client_node, *pending_node;
    fserve_t *client;
    int sbytes, bytes;

    while (run_fserv) {
        avl_tree_rlock(client_tree);

        client_node = avl_get_first(client_tree);
        if(!client_node) {
187
            avl_tree_rlock(pending_tree);
188
189
190
            pending_node = avl_get_first(pending_tree);
            if(!pending_node) {
                /* There are no current clients. Wait until there are... */
191
                avl_tree_unlock(pending_tree);
192
193
194
195
                avl_tree_unlock(client_tree);
                thread_cond_wait(&fserv_cond);
                continue;
            }
196
            avl_tree_unlock(pending_tree);
197
198
        }

199
200
201
202
203
204
205
        /* This isn't hugely efficient, but it'll do for now */
        avl_tree_unlock(client_tree);
        wait_for_fds();

        avl_tree_rlock(client_tree);
        client_node = avl_get_first(client_tree);

206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
        while(client_node) {
            avl_node_wlock(client_node);

            client = (fserve_t *)client_node->key;

            if(client->offset >= client->datasize) {
                /* Grab a new chunk */
                bytes = fread(client->buf, 1, BUFSIZE, client->file);
                if(bytes <= 0) {
                    client->client->con->error = 1;
                    avl_node_unlock(client_node);
                    client_node = avl_get_next(client_node);
                    continue;
                }
                client->offset = 0;
                client->datasize = bytes;
            }

            /* Now try and send current chunk. */
            sbytes = sock_write_bytes(client->client->con->sock, 
                    &client->buf[client->offset], 
                    client->datasize - client->offset);

229
            /* TODO: remove clients if they take too long. */
230
231
232
233
234
235
236
237
            if(sbytes >= 0) {
                client->offset += sbytes;
                client->client->con->sent_bytes += sbytes;
            }
            else if(!sock_recoverable(sock_error())) {
                DEBUG0("Fileserving client had fatal error, disconnecting");
                client->client->con->error = 1;
            }
238
            /*
239
240
            else
                DEBUG0("Fileserving client had recoverable error");
241
             */
242
243
244
245
246
247
248
249
250
251
252
253
254
255

            avl_node_unlock(client_node);
            client_node = avl_get_next(client_node);
        }

        avl_tree_unlock(client_tree);

        /* Now we need a write lock instead, to delete done clients. */
        avl_tree_wlock(client_tree);

        client_node = avl_get_first(client_tree);
        while(client_node) {
            client = (fserve_t *)client_node->key;
            if(client->client->con->error) {
256
                fserve_clients--;
257
258
                client_node = avl_get_next(client_node);
                avl_delete(client_tree, (void *)client, _free_client);
259
                client_tree_changed = 1;
260
261
262
263
264
265
266
267
268
269
270
271
                continue;
            }
            client_node = avl_get_next(client_node);
        }

        avl_tree_wlock(pending_tree);

        /* And now insert new clients. */
        client_node = avl_get_first(pending_tree);
        while(client_node) {
            client = (fserve_t *)client_node->key;
            avl_insert(client_tree, client);
272
273
274
            client_tree_changed = 1;
            fserve_clients++;
            stats_event_inc(NULL, "clients");
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
            client_node = avl_get_next(client_node);

        }

        /* clear pending */
        while(avl_get_first(pending_tree)) {
            avl_delete(pending_tree, avl_get_first(pending_tree)->key, 
                    _remove_client);
        }

        avl_tree_unlock(pending_tree);
        avl_tree_unlock(client_tree);
    }

    /* Shutdown path */

    avl_tree_wlock(pending_tree);
    while(avl_get_first(pending_tree))
        avl_delete(pending_tree, avl_get_first(pending_tree)->key, 
                _free_client);
    avl_tree_unlock(pending_tree);

    avl_tree_wlock(client_tree);
    while(avl_get_first(client_tree))
        avl_delete(client_tree, avl_get_first(client_tree)->key, 
                _free_client);
    avl_tree_unlock(client_tree);

    thread_exit(0);
    return NULL;
}

307
static char *fserve_content_type(char *path)
308
309
{
    char *ext = util_get_extension(path);
310
311
312
313
314
315
316
317
    mime_type exttype = {ext, NULL};
    mime_type *result;

    if(!avl_get_by_key(mimetypes, &exttype, (void **)(&result)))
        return result->type;
    else {
        /* Fallbacks for a few basic ones */
        if(!strcmp(ext, "ogg"))
318
            return "application/ogg";
319
320
321
322
323
324
325
326
327
        else if(!strcmp(ext, "mp3"))
            return "audio/mpeg";
        else if(!strcmp(ext, "html"))
            return "text/html";
        else if(!strcmp(ext, "txt"))
            return "text/plain";
        else
            return "application/octet-stream";
    }
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
}

static void fserve_client_destroy(fserve_t *client)
{
    if(client) {
        if(client->buf)
            free(client->buf);
        if(client->file)
            fclose(client->file);

        if(client->client)
            client_destroy(client->client);
        free(client);
    }
}

int fserve_client_create(client_t *httpclient, char *path)
{
    fserve_t *client = calloc(1, sizeof(fserve_t));
347
    int bytes;
348
349
350

    client->file = fopen(path, "rb");
    if(!client->file) {
351
        client_send_404(httpclient, "File not readable");
352
353
        return -1;
    }
354
355

    client->client = httpclient;
356
357
358
359
    client->offset = 0;
    client->datasize = 0;
    client->buf = malloc(BUFSIZE);

360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
    global_lock();
    if(global.clients >= config_get_config()->client_limit) {
        httpclient->respcode = 504;
        bytes = sock_write(httpclient->con->sock,
                "HTTP/1.0 504 Server Full\r\n"
                "Content-Type: text/html\r\n\r\n"
                "<b>Server is full, try again later.</b>\r\n");
        if(bytes > 0) httpclient->con->sent_bytes = bytes;
        fserve_client_destroy(client);
        global_unlock();
        return -1;
    }
    global.clients++;
    global_unlock();

    httpclient->respcode = 200;
    bytes = sock_write(httpclient->con->sock,
            "HTTP/1.0 200 OK\r\n"
            "Content-Type: %s\r\n\r\n",
            fserve_content_type(path));
    if(bytes > 0) httpclient->con->sent_bytes = bytes;

    sock_set_blocking(client->client->con->sock, SOCK_NONBLOCK);
383
    sock_set_nodelay(client->client->con->sock);
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
    avl_tree_wlock(pending_tree);
    avl_insert(pending_tree, client);
    avl_tree_unlock(pending_tree);

    thread_cond_signal(&fserv_cond);

    return 0;
}

static int _compare_clients(void *compare_arg, void *a, void *b)
{
	connection_t *cona = (connection_t *)a;
    connection_t *conb = (connection_t *)b;

	if (cona->id < conb->id) return -1;
	if (cona->id > conb->id) return 1;

	return 0;
}

static int _remove_client(void *key)
{
	return 1;
}

static int _free_client(void *key)
{
	fserve_t *client = (fserve_t *)key;

	fserve_client_destroy(client);
415
416
417
418
419
    global_lock();
    global.clients--;
    global_unlock();
    stats_event_dec(NULL, "clients");

420
421
422
423
	
	return 1;
}

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
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
static int _delete_mapping(void *mapping) {
    mime_type *map = mapping;
    free(map->ext);
    free(map->type);
    free(map);

    return 1;
}

static int _compare_mappings(void *arg, void *a, void *b)
{
    return strcmp(
            ((mime_type *)a)->ext,
            ((mime_type *)b)->ext);
}

static void create_mime_mappings(char *fn) {
    FILE *mimefile = fopen(fn, "r");
    char line[4096];
    char *type, *ext, *cur;
    mime_type *mapping, *tmp;

    mimetypes = avl_tree_new(_compare_mappings, NULL);

    if(!mimefile)
        return;

    while(fgets(line, 4096, mimefile))
    {
        line[4095] = 0;

        if(*line == 0 || *line == '#')
            continue;

        type = line;

        cur = line;

        while(*cur != ' ' && *cur != '\t' && *cur)
            cur++;
        if(*cur == 0)
            continue;

        *cur++ = 0;

        while(1) {
            while(*cur == ' ' || *cur == '\t')
                cur++;
            if(*cur == 0)
                break;

            ext = cur;
            while(*cur != ' ' && *cur != '\t' && *cur != '\n' && *cur)
                cur++;
            *cur++ = 0;
            if(*ext) {
                /* Add a new extension->type mapping */
                mapping = malloc(sizeof(mime_type));
                mapping->ext = strdup(ext);
                mapping->type = strdup(type);
                if(!avl_get_by_key(mimetypes, mapping, (void **)(&tmp)))
                    avl_delete(mimetypes, mapping, _delete_mapping);
                avl_insert(mimetypes, mapping);
            }
        }
    }

    fclose(mimefile);
}