summaryrefslogtreecommitdiff
path: root/libavformat/libsmbclient.c
blob: 84fef7f1620a68bbbe65c5879f21972219e0961f (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
/*
 * Copyright (c) 2014 Lukasz Marek <lukasz.m.luki@gmail.com>
 *
 * This file is part of FFmpeg.
 *
 * FFmpeg 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.
 *
 * FFmpeg 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 FFmpeg; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */

#include <libsmbclient.h>
#include "libavutil/avstring.h"
#include "libavutil/opt.h"
#include "avformat.h"
#include "internal.h"
#include "url.h"

typedef struct {
    const AVClass *class;
    SMBCCTX *ctx;
    int dh;
    int fd;
    int64_t filesize;
    int trunc;
    int timeout;
    char *workgroup;
} LIBSMBContext;

static void libsmbc_get_auth_data(SMBCCTX *c, const char *server, const char *share,
                                  char *workgroup, int workgroup_len,
                                  char *username, int username_len,
                                  char *password, int password_len)
{
    /* Do nothing yet. Credentials are passed via url.
     * Callback must exists, there might be a segmentation fault otherwise. */
}

static av_cold int libsmbc_connect(URLContext *h)
{
    LIBSMBContext *libsmbc = h->priv_data;

    libsmbc->ctx = smbc_new_context();
    if (!libsmbc->ctx) {
        int ret = AVERROR(errno);
        av_log(h, AV_LOG_ERROR, "Cannot create context: %s.\n", strerror(errno));
        return ret;
    }
    if (!smbc_init_context(libsmbc->ctx)) {
        int ret = AVERROR(errno);
        av_log(h, AV_LOG_ERROR, "Cannot initialize context: %s.\n", strerror(errno));
        return ret;
    }
    smbc_set_context(libsmbc->ctx);

    smbc_setOptionUserData(libsmbc->ctx, h);
    smbc_setFunctionAuthDataWithContext(libsmbc->ctx, libsmbc_get_auth_data);

    if (libsmbc->timeout != -1)
        smbc_setTimeout(libsmbc->ctx, libsmbc->timeout);
    if (libsmbc->workgroup)
        smbc_setWorkgroup(libsmbc->ctx, libsmbc->workgroup);

    if (smbc_init(NULL, 0) < 0) {
        int ret = AVERROR(errno);
        av_log(h, AV_LOG_ERROR, "Initialization failed: %s\n", strerror(errno));
        return ret;
    }
    return 0;
}

static av_cold int libsmbc_close(URLContext *h)
{
    LIBSMBContext *libsmbc = h->priv_data;
    if (libsmbc->fd >= 0) {
        smbc_close(libsmbc->fd);
        libsmbc->fd = -1;
    }
    if (libsmbc->ctx) {
        smbc_free_context(libsmbc->ctx, 1);
        libsmbc->ctx = NULL;
    }
    return 0;
}

static av_cold int libsmbc_open(URLContext *h, const char *url, int flags)
{
    LIBSMBContext *libsmbc = h->priv_data;
    int access, ret;
    struct stat st;

    libsmbc->fd = -1;
    libsmbc->filesize = -1;

    if ((ret = libsmbc_connect(h)) < 0)
        goto fail;

    if ((flags & AVIO_FLAG_WRITE) && (flags & AVIO_FLAG_READ)) {
        access = O_CREAT | O_RDWR;
        if (libsmbc->trunc)
            access |= O_TRUNC;
    } else if (flags & AVIO_FLAG_WRITE) {
        access = O_CREAT | O_WRONLY;
        if (libsmbc->trunc)
            access |= O_TRUNC;
    } else
        access = O_RDONLY;

    /* 0666 = -rw-rw-rw- = read+write for everyone, minus umask */
    if ((libsmbc->fd = smbc_open(url, access, 0666)) < 0) {
        ret = AVERROR(errno);
        av_log(h, AV_LOG_ERROR, "File open failed: %s\n", strerror(errno));
        goto fail;
    }

    if (smbc_fstat(libsmbc->fd, &st) < 0)
        av_log(h, AV_LOG_WARNING, "Cannot stat file: %s\n", strerror(errno));
    else
        libsmbc->filesize = st.st_size;

    return 0;
  fail:
    libsmbc_close(h);
    return ret;
}

static int64_t libsmbc_seek(URLContext *h, int64_t pos, int whence)
{
    LIBSMBContext *libsmbc = h->priv_data;
    int64_t newpos;

    if (whence == AVSEEK_SIZE) {
        if (libsmbc->filesize == -1) {
            av_log(h, AV_LOG_ERROR, "Error during seeking: filesize is unknown.\n");
            return AVERROR(EIO);
        } else
            return libsmbc->filesize;
    }

    if ((newpos = smbc_lseek(libsmbc->fd, pos, whence)) < 0) {
        int err = errno;
        av_log(h, AV_LOG_ERROR, "Error during seeking: %s\n", strerror(err));
        return AVERROR(err);
    }

    return newpos;
}

static int libsmbc_read(URLContext *h, unsigned char *buf, int size)
{
    LIBSMBContext *libsmbc = h->priv_data;
    int bytes_read;

    if ((bytes_read = smbc_read(libsmbc->fd, buf, size)) < 0) {
        int ret = AVERROR(errno);
        av_log(h, AV_LOG_ERROR, "Read error: %s\n", strerror(errno));
        return ret;
    }

    return bytes_read;
}

static int libsmbc_write(URLContext *h, const unsigned char *buf, int size)
{
    LIBSMBContext *libsmbc = h->priv_data;
    int bytes_written;

    if ((bytes_written = smbc_write(libsmbc->fd, buf, size)) < 0) {
        int ret = AVERROR(errno);
        av_log(h, AV_LOG_ERROR, "Write error: %s\n", strerror(errno));
        return ret;
    }

    return bytes_written;
}

static int libsmbc_open_dir(URLContext *h)
{
    LIBSMBContext *libsmbc = h->priv_data;
    int ret;

    if ((ret = libsmbc_connect(h)) < 0)
        goto fail;

    if ((libsmbc->dh = smbc_opendir(h->filename)) < 0) {
        ret = AVERROR(errno);
        av_log(h, AV_LOG_ERROR, "Error opening dir: %s\n", strerror(errno));
        goto fail;
    }

    return 0;

  fail:
    libsmbc_close(h);
    return ret;
}

static int libsmbc_read_dir(URLContext *h, AVIODirEntry **next)
{
    LIBSMBContext *libsmbc = h->priv_data;
    AVIODirEntry *entry;
    struct smbc_dirent *dirent = NULL;
    char *url = NULL;
    int skip_entry;

    *next = entry = ff_alloc_dir_entry();
    if (!entry)
        return AVERROR(ENOMEM);

    do {
        skip_entry = 0;
        dirent = smbc_readdir(libsmbc->dh);
        if (!dirent) {
            av_freep(next);
            return 0;
        }
        switch (dirent->smbc_type) {
        case SMBC_DIR:
            entry->type = AVIO_ENTRY_DIRECTORY;
            break;
        case SMBC_FILE:
            entry->type = AVIO_ENTRY_FILE;
            break;
        case SMBC_FILE_SHARE:
            entry->type = AVIO_ENTRY_SHARE;
            break;
        case SMBC_SERVER:
            entry->type = AVIO_ENTRY_SERVER;
            break;
        case SMBC_WORKGROUP:
            entry->type = AVIO_ENTRY_WORKGROUP;
            break;
        case SMBC_COMMS_SHARE:
        case SMBC_IPC_SHARE:
        case SMBC_PRINTER_SHARE:
            skip_entry = 1;
            break;
        case SMBC_LINK:
        default:
            entry->type = AVIO_ENTRY_UNKNOWN;
            break;
        }
    } while (skip_entry || !strcmp(dirent->name, ".") ||
             !strcmp(dirent->name, ".."));

    entry->name = av_strdup(dirent->name);
    if (!entry->name) {
        av_freep(next);
        return AVERROR(ENOMEM);
    }

    url = av_append_path_component(h->filename, dirent->name);
    if (url) {
        struct stat st;
        if (!smbc_stat(url, &st)) {
            entry->group_id = st.st_gid;
            entry->user_id = st.st_uid;
            entry->size = st.st_size;
            entry->filemode = st.st_mode & 0777;
            entry->modification_timestamp = INT64_C(1000000) * st.st_mtime;
            entry->access_timestamp =  INT64_C(1000000) * st.st_atime;
            entry->status_change_timestamp = INT64_C(1000000) * st.st_ctime;
        }
        av_free(url);
    }

    return 0;
}

static int libsmbc_close_dir(URLContext *h)
{
    LIBSMBContext *libsmbc = h->priv_data;
    if (libsmbc->dh >= 0) {
        smbc_closedir(libsmbc->dh);
        libsmbc->dh = -1;
    }
    libsmbc_close(h);
    return 0;
}

static int libsmbc_delete(URLContext *h)
{
    LIBSMBContext *libsmbc = h->priv_data;
    int ret;
    struct stat st;

    if ((ret = libsmbc_connect(h)) < 0)
        goto cleanup;

    if ((libsmbc->fd = smbc_open(h->filename, O_WRONLY, 0666)) < 0) {
        ret = AVERROR(errno);
        goto cleanup;
    }

    if (smbc_fstat(libsmbc->fd, &st) < 0) {
        ret = AVERROR(errno);
        goto cleanup;
    }

    smbc_close(libsmbc->fd);
    libsmbc->fd = -1;

    if (S_ISDIR(st.st_mode)) {
        if (smbc_rmdir(h->filename) < 0) {
            ret = AVERROR(errno);
            goto cleanup;
        }
    } else {
        if (smbc_unlink(h->filename) < 0) {
            ret = AVERROR(errno);
            goto cleanup;
        }
    }

    ret = 0;

cleanup:
    libsmbc_close(h);
    return ret;
}

static int libsmbc_move(URLContext *h_src, URLContext *h_dst)
{
    LIBSMBContext *libsmbc = h_src->priv_data;
    int ret;

    if ((ret = libsmbc_connect(h_src)) < 0)
        goto cleanup;

    if ((libsmbc->dh = smbc_rename(h_src->filename, h_dst->filename)) < 0) {
        ret = AVERROR(errno);
        goto cleanup;
    }

    ret = 0;

cleanup:
    libsmbc_close(h_src);
    return ret;
}

#define OFFSET(x) offsetof(LIBSMBContext, x)
#define D AV_OPT_FLAG_DECODING_PARAM
#define E AV_OPT_FLAG_ENCODING_PARAM
static const AVOption options[] = {
    {"timeout",   "set timeout in ms of socket I/O operations",    OFFSET(timeout), AV_OPT_TYPE_INT, {.i64 = -1}, -1, INT_MAX, D|E },
    {"truncate",  "truncate existing files on write",              OFFSET(trunc),   AV_OPT_TYPE_INT, { .i64 = 1 }, 0, 1, E },
    {"workgroup", "set the workgroup used for making connections", OFFSET(workgroup), AV_OPT_TYPE_STRING, { 0 }, 0, 0, D|E },
    {NULL}
};

static const AVClass libsmbclient_context_class = {
    .class_name     = "libsmbc",
    .item_name      = av_default_item_name,
    .option         = options,
    .version        = LIBAVUTIL_VERSION_INT,
};

URLProtocol ff_libsmbclient_protocol = {
    .name                = "smb",
    .url_open            = libsmbc_open,
    .url_read            = libsmbc_read,
    .url_write           = libsmbc_write,
    .url_seek            = libsmbc_seek,
    .url_close           = libsmbc_close,
    .url_delete          = libsmbc_delete,
    .url_move            = libsmbc_move,
    .url_open_dir        = libsmbc_open_dir,
    .url_read_dir        = libsmbc_read_dir,
    .url_close_dir       = libsmbc_close_dir,
    .priv_data_size      = sizeof(LIBSMBContext),
    .priv_data_class     = &libsmbclient_context_class,
    .flags               = URL_PROTOCOL_FLAG_NETWORK,
};