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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;
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 
48 {
49  LIBSMBContext *libsmbc = h->priv_data;
50 
51  libsmbc->ctx = smbc_new_context();
52  if (!libsmbc->ctx) {
53  int ret = AVERROR(errno);
54  av_log(h, AV_LOG_ERROR, "Cannot create context: %s.\n", strerror(errno));
55  return ret;
56  }
57  if (!smbc_init_context(libsmbc->ctx)) {
58  int ret = AVERROR(errno);
59  av_log(h, AV_LOG_ERROR, "Cannot initialize context: %s.\n", strerror(errno));
60  return ret;
61  }
62  smbc_set_context(libsmbc->ctx);
63 
64  smbc_setOptionUserData(libsmbc->ctx, h);
65  smbc_setFunctionAuthDataWithContext(libsmbc->ctx, libsmbc_get_auth_data);
66 
67  if (libsmbc->timeout != -1)
68  smbc_setTimeout(libsmbc->ctx, libsmbc->timeout);
69  if (libsmbc->workgroup)
70  smbc_setWorkgroup(libsmbc->ctx, libsmbc->workgroup);
71 
72  if (smbc_init(NULL, 0) < 0) {
73  int ret = AVERROR(errno);
74  av_log(h, AV_LOG_ERROR, "Initialization failed: %s\n", strerror(errno));
75  return ret;
76  }
77  return 0;
78 }
79 
81 {
82  LIBSMBContext *libsmbc = h->priv_data;
83  if (libsmbc->fd >= 0) {
84  smbc_close(libsmbc->fd);
85  libsmbc->fd = -1;
86  }
87  if (libsmbc->ctx) {
88  smbc_free_context(libsmbc->ctx, 1);
89  libsmbc->ctx = NULL;
90  }
91  return 0;
92 }
93 
94 static av_cold int libsmbc_open(URLContext *h, const char *url, int flags)
95 {
96  LIBSMBContext *libsmbc = h->priv_data;
97  int access, ret;
98  struct stat st;
99 
100  libsmbc->fd = -1;
101  libsmbc->filesize = -1;
102 
103  if ((ret = libsmbc_connect(h)) < 0)
104  goto fail;
105 
106  if ((flags & AVIO_FLAG_WRITE) && (flags & AVIO_FLAG_READ)) {
107  access = O_CREAT | O_RDWR;
108  if (libsmbc->trunc)
109  access |= O_TRUNC;
110  } else if (flags & AVIO_FLAG_WRITE) {
111  access = O_CREAT | O_WRONLY;
112  if (libsmbc->trunc)
113  access |= O_TRUNC;
114  } else
115  access = O_RDONLY;
116 
117  /* 0666 = -rw-rw-rw- = read+write for everyone, minus umask */
118  if ((libsmbc->fd = smbc_open(url, access, 0666)) < 0) {
119  ret = AVERROR(errno);
120  av_log(h, AV_LOG_ERROR, "File open failed: %s\n", strerror(errno));
121  goto fail;
122  }
123 
124  if (smbc_fstat(libsmbc->fd, &st) < 0)
125  av_log(h, AV_LOG_WARNING, "Cannot stat file: %s\n", strerror(errno));
126  else
127  libsmbc->filesize = st.st_size;
128 
129  return 0;
130  fail:
131  libsmbc_close(h);
132  return ret;
133 }
134 
135 static int64_t libsmbc_seek(URLContext *h, int64_t pos, int whence)
136 {
137  LIBSMBContext *libsmbc = h->priv_data;
138  int64_t newpos;
139 
140  if (whence == AVSEEK_SIZE) {
141  if (libsmbc->filesize == -1) {
142  av_log(h, AV_LOG_ERROR, "Error during seeking: filesize is unknown.\n");
143  return AVERROR(EIO);
144  } else
145  return libsmbc->filesize;
146  }
147 
148  if ((newpos = smbc_lseek(libsmbc->fd, pos, whence)) < 0) {
149  int err = errno;
150  av_log(h, AV_LOG_ERROR, "Error during seeking: %s\n", strerror(err));
151  return AVERROR(err);
152  }
153 
154  return newpos;
155 }
156 
157 static int libsmbc_read(URLContext *h, unsigned char *buf, int size)
158 {
159  LIBSMBContext *libsmbc = h->priv_data;
160  int bytes_read;
161 
162  if ((bytes_read = smbc_read(libsmbc->fd, buf, size)) < 0) {
163  int ret = AVERROR(errno);
164  av_log(h, AV_LOG_ERROR, "Read error: %s\n", strerror(errno));
165  return ret;
166  }
167 
168  return bytes_read;
169 }
170 
171 static int libsmbc_write(URLContext *h, const unsigned char *buf, int size)
172 {
173  LIBSMBContext *libsmbc = h->priv_data;
174  int bytes_written;
175 
176  if ((bytes_written = smbc_write(libsmbc->fd, buf, size)) < 0) {
177  int ret = AVERROR(errno);
178  av_log(h, AV_LOG_ERROR, "Write error: %s\n", strerror(errno));
179  return ret;
180  }
181 
182  return bytes_written;
183 }
184 
185 #define OFFSET(x) offsetof(LIBSMBContext, x)
186 #define D AV_OPT_FLAG_DECODING_PARAM
187 #define E AV_OPT_FLAG_ENCODING_PARAM
188 static const AVOption options[] = {
189  {"timeout", "set timeout in ms of socket I/O operations", OFFSET(timeout), AV_OPT_TYPE_INT, {.i64 = -1}, -1, INT_MAX, D|E },
190  {"truncate", "truncate existing files on write", OFFSET(trunc), AV_OPT_TYPE_INT, { .i64 = 1 }, 0, 1, E },
191  {"workgroup", "set the workgroup used for making connections", OFFSET(workgroup), AV_OPT_TYPE_STRING, { 0 }, 0, 0, D|E },
192  {NULL}
193 };
194 
196  .class_name = "libsmbc",
197  .item_name = av_default_item_name,
198  .option = options,
199  .version = LIBAVUTIL_VERSION_INT,
200 };
201 
203  .name = "smb",
204  .url_open = libsmbc_open,
205  .url_read = libsmbc_read,
206  .url_write = libsmbc_write,
207  .url_seek = libsmbc_seek,
208  .url_close = libsmbc_close,
209  .priv_data_size = sizeof(LIBSMBContext),
210  .priv_data_class = &libsmbclient_context_class,
212 };