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
|
/*
* Copyright (c) 2013 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 <fcntl.h>
#include <libssh/sftp.h>
#include "libavutil/avstring.h"
#include "libavutil/opt.h"
#include "avformat.h"
#include "internal.h"
#include "url.h"
typedef struct {
const AVClass *class;
ssh_session session;
sftp_session sftp;
sftp_file file;
int64_t filesize;
int rw_timeout;
int trunc;
} LIBSSHContext;
static int libssh_close(URLContext *h)
{
LIBSSHContext *s = h->priv_data;
if (s->file)
sftp_close(s->file);
if (s->sftp)
sftp_free(s->sftp);
if (s->session) {
ssh_disconnect(s->session);
ssh_free(s->session);
}
return 0;
}
static int libssh_open(URLContext *h, const char *url, int flags)
{
static const int verbosity = SSH_LOG_NOLOG;
LIBSSHContext *s = h->priv_data;
char proto[10], path[MAX_URL_SIZE], hostname[1024], credencials[1024];
int port = 22, access, ret;
long timeout = s->rw_timeout * 1000;
const char *user = NULL, *pass = NULL;
char *end = NULL;
sftp_attributes stat;
av_url_split(proto, sizeof(proto),
credencials, sizeof(credencials),
hostname, sizeof(hostname),
&port,
path, sizeof(path),
url);
if (port <= 0 || port > 65535)
port = 22;
if (!(s->session = ssh_new())) {
ret = AVERROR(ENOMEM);
goto fail;
}
user = av_strtok(credencials, ":", &end);
pass = av_strtok(end, ":", &end);
ssh_options_set(s->session, SSH_OPTIONS_HOST, hostname);
ssh_options_set(s->session, SSH_OPTIONS_PORT, &port);
ssh_options_set(s->session, SSH_OPTIONS_LOG_VERBOSITY, &verbosity);
if (timeout > 0)
ssh_options_set(s->session, SSH_OPTIONS_TIMEOUT_USEC, &timeout);
if (user)
ssh_options_set(s->session, SSH_OPTIONS_USER, user);
if (ssh_connect(s->session) != SSH_OK) {
av_log(h, AV_LOG_ERROR, "Connection failed. %s\n", ssh_get_error(s->session));
ret = AVERROR(EIO);
goto fail;
}
if (ssh_userauth_autopubkey(s->session, pass) != SSH_AUTH_SUCCESS) {
av_log(s, AV_LOG_DEBUG, "Authentication using public key failed, trying password method.\n");
if (ssh_userauth_password(s->session, NULL, pass) != SSH_AUTH_SUCCESS) {
av_log(h, AV_LOG_ERROR, "Authentication failed.\n");
ret = AVERROR(EACCES);
goto fail;
}
}
if (!(s->sftp = sftp_new(s->session))) {
av_log(h, AV_LOG_ERROR, "SFTP session creation failed: %s\n", ssh_get_error(s->session));
ret = AVERROR(ENOMEM);
goto fail;
}
if (sftp_init(s->sftp) != SSH_OK) {
av_log(h, AV_LOG_ERROR, "Error initializing sftp session: %s\n", ssh_get_error(s->session));
ret = AVERROR(EIO);
goto fail;
}
if ((flags & AVIO_FLAG_WRITE) && (flags & AVIO_FLAG_READ)) {
access = O_CREAT | O_RDWR;
if (s->trunc)
access |= O_TRUNC;
} else if (flags & AVIO_FLAG_WRITE) {
access = O_CREAT | O_WRONLY;
if (s->trunc)
access |= O_TRUNC;
} else {
access = O_RDONLY;
}
/* 0666 = -rw-rw-rw- = read+write for everyone, minus umask */
if (!(s->file = sftp_open(s->sftp, path, access, 0666))) {
av_log(h, AV_LOG_ERROR, "Error opening sftp file: %s\n", ssh_get_error(s->session));
ret = AVERROR(EIO);
goto fail;
}
if (!(stat = sftp_fstat(s->file))) {
av_log(h, AV_LOG_WARNING, "Cannot stat remote file %s.\n", path);
s->filesize = -1;
} else {
s->filesize = stat->size;
sftp_attributes_free(stat);
}
return 0;
fail:
libssh_close(h);
return ret;
}
static int64_t libssh_seek(URLContext *h, int64_t pos, int whence)
{
LIBSSHContext *s = h->priv_data;
int64_t newpos;
if (s->filesize == -1 && (whence == AVSEEK_SIZE || whence == SEEK_END)) {
av_log(h, AV_LOG_ERROR, "Error during seeking.\n");
return AVERROR(EIO);
}
switch(whence) {
case AVSEEK_SIZE:
return s->filesize;
case SEEK_SET:
newpos = pos;
break;
case SEEK_CUR:
newpos = sftp_tell64(s->file);
break;
case SEEK_END:
newpos = s->filesize + pos;
break;
default:
return AVERROR(EINVAL);
}
if (sftp_seek64(s->file, newpos)) {
av_log(h, AV_LOG_ERROR, "Error during seeking.\n");
return AVERROR(EIO);
}
return newpos;
}
static int libssh_read(URLContext *h, unsigned char *buf, int size)
{
LIBSSHContext *s = h->priv_data;
int bytes_read;
if ((bytes_read = sftp_read(s->file, buf, size)) < 0) {
av_log(h, AV_LOG_ERROR, "Read error.\n");
return AVERROR(EIO);
}
return bytes_read;
}
static int libssh_write(URLContext *h, const unsigned char *buf, int size)
{
LIBSSHContext *s = h->priv_data;
int bytes_written;
if ((bytes_written = sftp_write(s->file, buf, size)) < 0) {
av_log(h, AV_LOG_ERROR, "Write error.\n");
return AVERROR(EIO);
}
return bytes_written;
}
#define OFFSET(x) offsetof(LIBSSHContext, x)
#define D AV_OPT_FLAG_DECODING_PARAM
#define E AV_OPT_FLAG_ENCODING_PARAM
static const AVOption options[] = {
{"timeout", "set timeout of socket I/O operations", OFFSET(rw_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 },
{NULL}
};
static const AVClass libssh_context_class = {
.class_name = "libssh",
.item_name = av_default_item_name,
.option = options,
.version = LIBAVUTIL_VERSION_INT,
};
URLProtocol ff_libssh_protocol = {
.name = "sftp",
.url_open = libssh_open,
.url_read = libssh_read,
.url_write = libssh_write,
.url_seek = libssh_seek,
.url_close = libssh_close,
.priv_data_size = sizeof(LIBSSHContext),
.priv_data_class = &libssh_context_class,
.flags = URL_PROTOCOL_FLAG_NETWORK,
};
|
