aboutsummaryrefslogtreecommitdiffhomepage
path: root/stream/stream_file.c
blob: 8778e7e011b595c59c39325bb92373899b3d5b5e (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
/*
 * Original authors: Albeu, probably Arpi
 *
 * This file is part of mpv.
 *
 * mpv is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * mpv is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with mpv.  If not, see <http://www.gnu.org/licenses/>.
 */

#include "config.h"

#include <stdio.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include <errno.h>

#ifndef __MINGW32__
#include <poll.h>
#endif

#include "osdep/io.h"

#include "common/common.h"
#include "common/msg.h"
#include "stream.h"
#include "options/m_option.h"
#include "options/path.h"

#if HAVE_BSD_FSTATFS
#include <sys/param.h>
#include <sys/mount.h>
#endif

#if HAVE_LINUX_FSTATFS
#include <sys/vfs.h>
#endif

#ifdef _WIN32
#include <windows.h>
#include <winternl.h>
#include <io.h>

#ifndef FILE_REMOTE_DEVICE
#define FILE_REMOTE_DEVICE (0x10)
#endif
#endif

struct priv {
    int fd;
    bool close;
    bool use_poll;
    bool regular_file;
    bool appending;
    int64_t orig_size;
};

// Total timeout = RETRY_TIMEOUT * MAX_RETRIES
#define RETRY_TIMEOUT 0.2
#define MAX_RETRIES 10

static int64_t get_size(stream_t *s)
{
    struct priv *p = s->priv;
    off_t size = lseek(p->fd, 0, SEEK_END);
    lseek(p->fd, s->pos, SEEK_SET);
    return size == (off_t)-1 ? -1 : size;
}

static int fill_buffer(stream_t *s, char *buffer, int max_len)
{
    struct priv *p = s->priv;

#ifndef __MINGW32__
    if (p->use_poll) {
        int c = s->cancel ? mp_cancel_get_fd(s->cancel) : -1;
        struct pollfd fds[2] = {
            {.fd = p->fd, .events = POLLIN},
            {.fd = c, .events = POLLIN},
        };
        poll(fds, c >= 0 ? 2 : 1, -1);
        if (fds[1].revents & POLLIN)
            return -1;
    }
#endif

    for (int retries = 0; retries < MAX_RETRIES; retries++) {
        int r = read(p->fd, buffer, max_len);
        if (r > 0)
            return r;

        // Try to detect and handle files being appended during playback.
        int64_t size = get_size(s);
        if (p->regular_file && size > p->orig_size && !p->appending) {
            MP_WARN(s, "File is apparently being appended to, will keep "
                    "retrying with timeouts.\n");
            p->appending = true;
        }

        if (!p->appending || p->use_poll)
            break;

        if (mp_cancel_wait(s->cancel, RETRY_TIMEOUT))
            break;
    }

    return 0;
}

static int write_buffer(stream_t *s, char *buffer, int len)
{
    struct priv *p = s->priv;
    int r;
    int wr = 0;
    while (wr < len) {
        r = write(p->fd, buffer, len);
        if (r <= 0)
            return -1;
        wr += r;
        buffer += r;
    }
    return len;
}

static int seek(stream_t *s, int64_t newpos)
{
    struct priv *p = s->priv;
    return lseek(p->fd, newpos, SEEK_SET) != (off_t)-1;
}

static int control(stream_t *s, int cmd, void *arg)
{
    switch (cmd) {
    case STREAM_CTRL_GET_SIZE: {
        int64_t size = get_size(s);
        if (size >= 0) {
            *(int64_t *)arg = size;
            return 1;
        }
        break;
    }
    }
    return STREAM_UNSUPPORTED;
}

static void s_close(stream_t *s)
{
    struct priv *p = s->priv;
    if (p->close)
        close(p->fd);
}

// If url is a file:// URL, return the local filename, otherwise return NULL.
char *mp_file_url_to_filename(void *talloc_ctx, bstr url)
{
    bstr proto = mp_split_proto(url, &url);
    if (bstrcasecmp0(proto, "file") != 0)
        return NULL;
    char *filename = bstrto0(talloc_ctx, url);
    mp_url_unescape_inplace(filename);
#if HAVE_DOS_PATHS
    // extract '/' from '/x:/path'
    if (filename[0] == '/' && filename[1] && filename[2] == ':')
        memmove(filename, filename + 1, strlen(filename)); // including \0
#endif
    return filename;
}

// Return talloc_strdup's filesystem path if local, otherwise NULL.
// Unlike mp_file_url_to_filename(), doesn't return NULL if already local.
char *mp_file_get_path(void *talloc_ctx, bstr url)
{
    if (mp_split_proto(url, &(bstr){0}).len) {
        return mp_file_url_to_filename(talloc_ctx, url);
    } else {
        return bstrto0(talloc_ctx, url);
    }
}

#if HAVE_BSD_FSTATFS
static bool check_stream_network(int fd)
{
    struct statfs fs;
    const char *stypes[] = { "afpfs", "nfs", "smbfs", "webdav", "osxfusefs",
                             NULL };
    if (fstatfs(fd, &fs) == 0)
        for (int i=0; stypes[i]; i++)
            if (strcmp(stypes[i], fs.f_fstypename) == 0)
                return true;
    return false;

}
#elif HAVE_LINUX_FSTATFS
static bool check_stream_network(int fd)
{
    struct statfs fs;
    const uint32_t stypes[] = {
        0x5346414F  /*AFS*/,    0x61756673  /*AUFS*/,   0x00C36400  /*CEPH*/,
        0xFF534D42  /*CIFS*/,   0x73757245  /*CODA*/,   0x19830326  /*FHGFS*/,
        0x65735546  /*FUSEBLK*/,0x65735543  /*FUSECTL*/,0x1161970   /*GFS*/,
        0x47504653  /*GPFS*/,   0x6B414653  /*KAFS*/,   0x0BD00BD0  /*LUSTRE*/,
        0x564C      /*NCP*/,    0x6969      /*NFS*/,    0x6E667364  /*NFSD*/,
        0xAAD7AAEA  /*PANFS*/,  0x50495045  /*PIPEFS*/, 0x517B      /*SMB*/,
        0xBEEFDEAD  /*SNFS*/,   0xBACBACBC  /*VMHGFS*/, 0x7461636f  /*OCFS2*/,
        0xFE534D42  /*SMB2*/,   0x61636673  /*ACFS*/,   0x013111A8  /*IBRIX*/,
        0
    };
    if (fstatfs(fd, &fs) == 0) {
        for (int i=0; stypes[i]; i++) {
            if (stypes[i] == fs.f_type)
                return true;
        }
    }
    return false;

}
#elif defined(_WIN32)
static bool check_stream_network(int fd)
{
    NTSTATUS (NTAPI *pNtQueryVolumeInformationFile)(HANDLE,
        PIO_STATUS_BLOCK, PVOID, ULONG, FS_INFORMATION_CLASS) = NULL;

    // NtQueryVolumeInformationFile is an internal Windows function. It has
    // been present since Windows XP, however this code should fail gracefully
    // if it's removed from a future version of Windows.
    HMODULE ntdll = GetModuleHandleW(L"ntdll.dll");
    pNtQueryVolumeInformationFile = (NTSTATUS (NTAPI*)(HANDLE,
        PIO_STATUS_BLOCK, PVOID, ULONG, FS_INFORMATION_CLASS))
        GetProcAddress(ntdll, "NtQueryVolumeInformationFile");

    if (!pNtQueryVolumeInformationFile)
        return false;

    HANDLE h = (HANDLE)_get_osfhandle(fd);
    if (h == INVALID_HANDLE_VALUE)
        return false;

    FILE_FS_DEVICE_INFORMATION info = { 0 };
    IO_STATUS_BLOCK io;
    NTSTATUS status = pNtQueryVolumeInformationFile(h, &io, &info,
        sizeof(info), FileFsDeviceInformation);
    if (!NT_SUCCESS(status))
        return false;

    return info.DeviceType == FILE_DEVICE_NETWORK_FILE_SYSTEM ||
           (info.Characteristics & FILE_REMOTE_DEVICE);
}
#else
static bool check_stream_network(int fd)
{
    return false;
}
#endif

static int open_f(stream_t *stream)
{
    struct priv *p = talloc_ptrtype(stream, p);
    *p = (struct priv) {
        .fd = -1
    };
    stream->priv = p;
    stream->is_local_file = true;

    bool write = stream->mode == STREAM_WRITE;
    int m = O_CLOEXEC | (write ? O_RDWR | O_CREAT | O_TRUNC : O_RDONLY);

    char *filename = mp_file_url_to_filename(stream, bstr0(stream->url));
    if (filename) {
        stream->path = filename;
    } else {
        filename = stream->path;
    }

    bool is_fdclose = strncmp(stream->url, "fdclose://", 10) == 0;
    if (strncmp(stream->url, "fd://", 5) == 0 || is_fdclose) {
        char *begin = strstr(stream->url, "://") + 3, *end = NULL;
        p->fd = strtol(begin, &end, 0);
        if (!end || end == begin || end[0]) {
            MP_ERR(stream, "Invalid FD: %s\n", stream->url);
            return STREAM_ERROR;
        }
        if (is_fdclose)
            p->close = true;
    } else if (!strcmp(filename, "-")) {
        if (!write) {
            MP_INFO(stream, "Reading from stdin...\n");
            p->fd = 0;
        } else {
            MP_INFO(stream, "Writing to stdout...\n");
            p->fd = 1;
        }
    } else {
        if (bstr_startswith0(bstr0(stream->url), "appending://"))
            p->appending = true;

        mode_t openmode = S_IRUSR | S_IWUSR;
#ifndef __MINGW32__
        openmode |= S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH;
        if (!write)
            m |= O_NONBLOCK;
        p->use_poll = true;
#endif
        p->fd = open(filename, m | O_BINARY, openmode);
        if (p->fd < 0) {
            MP_ERR(stream, "Cannot open file '%s': %s\n",
                   filename, mp_strerror(errno));
            return STREAM_ERROR;
        }
        struct stat st;
        if (fstat(p->fd, &st) == 0) {
            if (S_ISDIR(st.st_mode)) {
                p->use_poll = false;
                stream->is_directory = true;
                stream->allow_caching = false;
                MP_INFO(stream, "This is a directory - adding to playlist.\n");
            }
#ifndef __MINGW32__
            if (S_ISREG(st.st_mode)) {
                p->use_poll = false;
                p->regular_file = true;
                // O_NONBLOCK has weird semantics on file locks; remove it.
                int val = fcntl(p->fd, F_GETFL) & ~(unsigned)O_NONBLOCK;
                fcntl(p->fd, F_SETFL, val);
            }
#endif
        }
        p->close = true;
    }

#ifdef __MINGW32__
    setmode(p->fd, O_BINARY);
#endif

    off_t len = lseek(p->fd, 0, SEEK_END);
    lseek(p->fd, 0, SEEK_SET);
    if (len != (off_t)-1) {
        stream->seek = seek;
        stream->seekable = true;
    }

    stream->fast_skip = true;
    stream->fill_buffer = fill_buffer;
    stream->write_buffer = write_buffer;
    stream->control = control;
    stream->read_chunk = 64 * 1024;
    stream->close = s_close;

    if (check_stream_network(p->fd))
        stream->streaming = true;

    p->orig_size = get_size(stream);

    return STREAM_OK;
}

const stream_info_t stream_info_file = {
    .name = "file",
    .open = open_f,
    .protocols = (const char*const[]){ "file", "", "fd", "fdclose",
                                       "appending", NULL },
    .can_write = true,
    .is_safe = true,
};