FFmpeg: libavformat/libsmbclient.c Source File

FFmpeg
libsmbclient.c
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1 /*
2  * Copyright (c) 2014 Lukasz Marek <lukasz.m.luki@gmail.com>
3  *
4  * This file is part of FFmpeg.
5  *
6  * FFmpeg is free software; you can redistribute it and/or
7  * modify it under the terms of the GNU Lesser General Public
8  * License as published by the Free Software Foundation; either
9  * version 2.1 of the License, or (at your option) any later version.
10  *
11  * FFmpeg is distributed in the hope that it will be useful,
12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14  * Lesser General Public License for more details.
15  *
16  * You should have received a copy of the GNU Lesser General Public
17  * License along with FFmpeg; if not, write to the Free Software
18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19  */
20 
21 #include <libsmbclient.h>
22 #include "libavutil/avstring.h"
23 #include "libavutil/opt.h"
24 #include "avformat.h"
25 #include "internal.h"
26 #include "url.h"
27 
28  typedef struct {
29   const AVClass *class;
30   SMBCCTX *ctx;
31   int fd;
32   int64_t filesize;
33   int trunc;
34   int timeout;
35   char *workgroup;
36 } LIBSMBContext;
37 
38  static void libsmbc_get_auth_data(SMBCCTX *c, const char *server, const char *share,
39  char *workgroup, int workgroup_len,
40  char *username, int username_len,
41  char *password, int password_len)
42 {
43  /* Do nothing yet. Credentials are passed via url.
44  * Callback must exists, there might be a segmentation fault otherwise. */
45 }
46 
47  static av_cold int libsmbc_connect(URLContext *h)
48 {
49  LIBSMBContext *libsmbc = h->priv_data;
50 
51  libsmbc->ctx = smbc_new_context();
52  if (!libsmbc->ctx) {
53  av_log(h, AV_LOG_ERROR, "Cannot create context: %s.\n", strerror(errno));
54  return AVERROR(errno);
55  }
56  if (!smbc_init_context(libsmbc->ctx)) {
57  av_log(h, AV_LOG_ERROR, "Cannot initialize context: %s.\n", strerror(errno));
58  return AVERROR(errno);
59  }
60  smbc_set_context(libsmbc->ctx);
61 
62  smbc_setOptionUserData(libsmbc->ctx, h);
63  smbc_setFunctionAuthDataWithContext(libsmbc->ctx, libsmbc_get_auth_data);
64 
65  if (libsmbc->timeout != -1)
66  smbc_setTimeout(libsmbc->ctx, libsmbc->timeout);
67  if (libsmbc->workgroup)
68  smbc_setWorkgroup(libsmbc->ctx, libsmbc->workgroup);
69 
70  if (smbc_init(NULL, 0) < 0) {
71  av_log(h, AV_LOG_ERROR, "Initialization failed: %s\n", strerror(errno));
72  return AVERROR(errno);
73  }
74  return 0;
75 }
76 
77  static av_cold int libsmbc_close(URLContext *h)
78 {
79  LIBSMBContext *libsmbc = h->priv_data;
80  if (libsmbc->fd >= 0) {
81  smbc_close(libsmbc->fd);
82  libsmbc->fd = -1;
83  }
84  if (libsmbc->ctx) {
85  smbc_free_context(libsmbc->ctx, 1);
86  libsmbc->ctx = NULL;
87  }
88  return 0;
89 }
90 
91  static av_cold int libsmbc_open(URLContext *h, const char *url, int flags)
92 {
93  LIBSMBContext *libsmbc = h->priv_data;
94  int access, ret;
95  struct stat st;
96 
97  libsmbc->fd = -1;
98  libsmbc->filesize = -1;
99 
100  if ((ret = libsmbc_connect(h)) < 0)
101  goto fail;
102 
103  if ((flags & AVIO_FLAG_WRITE) && (flags & AVIO_FLAG_READ)) {
104  access = O_CREAT | O_RDWR;
105  if (libsmbc->trunc)
106  access |= O_TRUNC;
107  } else if (flags & AVIO_FLAG_WRITE) {
108  access = O_CREAT | O_WRONLY;
109  if (libsmbc->trunc)
110  access |= O_TRUNC;
111  } else
112  access = O_RDONLY;
113 
114  /* 0666 = -rw-rw-rw- = read+write for everyone, minus umask */
115  if ((libsmbc->fd = smbc_open(url, access, 0666)) < 0) {
116  ret = AVERROR(errno);
117  av_log(h, AV_LOG_ERROR, "File open failed: %s\n", strerror(errno));
118  goto fail;
119  }
120 
121  if (smbc_fstat(libsmbc->fd, &st) < 0)
122  av_log(h, AV_LOG_WARNING, "Cannot stat file: %s\n", strerror(errno));
123  else
124  libsmbc->filesize = st.st_size;
125 
126  return 0;
127  fail:
128  libsmbc_close(h);
129  return ret;
130 }
131 
132  static int64_t libsmbc_seek(URLContext *h, int64_t pos, int whence)
133 {
134  LIBSMBContext *libsmbc = h->priv_data;
135  int64_t newpos;
136 
137  if (whence == AVSEEK_SIZE) {
138  if (libsmbc->filesize == -1) {
139  av_log(h, AV_LOG_ERROR, "Error during seeking: filesize is unknown.\n");
140  return AVERROR(EIO);
141  } else
142  return libsmbc->filesize;
143  }
144 
145  if ((newpos = smbc_lseek(libsmbc->fd, pos, whence)) < 0) {
146  int err = errno;
147  av_log(h, AV_LOG_ERROR, "Error during seeking: %s\n", strerror(err));
148  return AVERROR(err);
149  }
150 
151  return newpos;
152 }
153 
154  static int libsmbc_read(URLContext *h, unsigned char *buf, int size)
155 {
156  LIBSMBContext *libsmbc = h->priv_data;
157  int bytes_read;
158 
159  if ((bytes_read = smbc_read(libsmbc->fd, buf, size)) < 0) {
160  av_log(h, AV_LOG_ERROR, "Read error: %s\n", strerror(errno));
161  return AVERROR(errno);
162  }
163 
164  return bytes_read;
165 }
166 
167  static int libsmbc_write(URLContext *h, const unsigned char *buf, int size)
168 {
169  LIBSMBContext *libsmbc = h->priv_data;
170  int bytes_written;
171 
172  if ((bytes_written = smbc_write(libsmbc->fd, buf, size)) < 0) {
173  av_log(h, AV_LOG_ERROR, "Write error: %s\n", strerror(errno));
174  return AVERROR(errno);
175  }
176 
177  return bytes_written;
178 }
179 
180  #define OFFSET(x) offsetof(LIBSMBContext, x)
181  #define D AV_OPT_FLAG_DECODING_PARAM
182  #define E AV_OPT_FLAG_ENCODING_PARAM
183  static const AVOption options[] = {
184  {"timeout", "set timeout in ms of socket I/O operations", OFFSET(timeout), AV_OPT_TYPE_INT, {.i64 = -1}, -1, INT_MAX, D|E },
185  {"truncate", "truncate existing files on write", OFFSET(trunc), AV_OPT_TYPE_INT, { .i64 = 1 }, 0, 1, E },
186  {"workgroup", "set the workgroup used for making connections", OFFSET(workgroup), AV_OPT_TYPE_STRING, { 0 }, 0, 0, D|E },
187  {NULL}
188 };
189 
190  static const AVClass libsmbclient_context_class = {
191  .class_name = "libsmbc",
192  .item_name = av_default_item_name,
193  .option = options,
194  .version = LIBAVUTIL_VERSION_INT,
195 };
196 
197  URLProtocol ff_libsmbclient_protocol = {
198  .name = "smb",
199  .url_open = libsmbc_open,
200  .url_read = libsmbc_read,
201  .url_write = libsmbc_write,
202  .url_seek = libsmbc_seek,
203  .url_close = libsmbc_close,
204  .priv_data_size = sizeof(LIBSMBContext),
205  .priv_data_class = &libsmbclient_context_class,
206  .flags = URL_PROTOCOL_FLAG_NETWORK,
207 };
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