FFmpeg: libavformat/libssh.c Source File

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libavformat

libssh.c

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1 /*

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 */

21 #include <fcntl.h>

22 #include <libssh/sftp.h>

23 #include "libavutil/avstring.h"

24 #include "libavutil/opt.h"

25 #include "avformat.h"

26 #include "internal.h"

27 #include "url.h"

29 typedef struct {

30 const AVClass *class;

31 ssh_session session;

32 sftp_session sftp;

33 sftp_file file;

34 int64_t filesize;

35 int rw_timeout;

36 int trunc;

37 } LIBSSHContext;

39 static int libssh_close(URLContext *h)

40 {

41 LIBSSHContext *s = h->priv_data;

42 if (s->file)

43 sftp_close(s->file);

44 if (s->sftp)

45 sftp_free(s->sftp);

46 if (s->session) {

47 ssh_disconnect(s->session);

48 ssh_free(s->session);

49 }

50 return 0;

51 }

53 static int libssh_open(URLContext *h, const char *url, int flags)

54 {

55 static const int verbosity = SSH_LOG_NOLOG;

56 LIBSSHContext *s = h->priv_data;

57 char proto[10], path[MAX_URL_SIZE], hostname[1024], credencials[1024];

58 int port = 22, access, ret;

59 long timeout = s->rw_timeout * 1000;

60 const char *user = NULL, *pass = NULL;

61 char *end = NULL;

62 sftp_attributes stat;

64 av_url_split(proto, sizeof(proto),

65 credencials, sizeof(credencials),

66 hostname, sizeof(hostname),

67 &port,

68 path, sizeof(path),

69 url);

71 if (port <= 0 || port > 65535)

72 port = 22;

74 if (!(s->session = ssh_new())) {

75 ret = AVERROR(ENOMEM);

76 goto fail;

77 }

78 user = av_strtok(credencials, ":", &end);

79 pass = av_strtok(end, ":", &end);

80 ssh_options_set(s->session, SSH_OPTIONS_HOST, hostname);

81 ssh_options_set(s->session, SSH_OPTIONS_PORT, &port);

82 ssh_options_set(s->session, SSH_OPTIONS_LOG_VERBOSITY, &verbosity);

83 if (timeout > 0)

84 ssh_options_set(s->session, SSH_OPTIONS_TIMEOUT_USEC, &timeout);

85 if (user)

86 ssh_options_set(s->session, SSH_OPTIONS_USER, user);

88 if (ssh_connect(s->session) != SSH_OK) {

89 av_log(h, AV_LOG_ERROR, "Connection failed. %s\n", ssh_get_error(s->session));

90 ret = AVERROR(EIO);

91 goto fail;

92 }

94 if (pass && ssh_userauth_password(s->session, NULL, pass) != SSH_AUTH_SUCCESS) {

95 av_log(h, AV_LOG_ERROR, "Error authenticating with password: %s\n", ssh_get_error(s->session));

96 ret = AVERROR(EACCES);

97 goto fail;

98 }

100 if (!(s->sftp = sftp_new(s->session))) {

101 av_log(h, AV_LOG_ERROR, "SFTP session creation failed: %s\n", ssh_get_error(s->session));

102 ret = AVERROR(ENOMEM);

103 goto fail;

104 }

105

106 if (sftp_init(s->sftp) != SSH_OK) {

107 av_log(h, AV_LOG_ERROR, "Error initializing sftp session: %s\n", ssh_get_error(s->session));

108 ret = AVERROR(EIO);

109 goto fail;

110 }

111

112 if ((flags & AVIO_FLAG_WRITE) && (flags & AVIO_FLAG_READ)) {

113 access = O_CREAT | O_RDWR;

114 if (s->trunc)

115 access |= O_TRUNC;

116 } else if (flags & AVIO_FLAG_WRITE) {

117 access = O_CREAT | O_WRONLY;

118 if (s->trunc)

119 access |= O_TRUNC;

120 } else {

121 access = O_RDONLY;

122 }

123

124 if (!(s->file = sftp_open(s->sftp, path, access, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH))) {

125 av_log(h, AV_LOG_ERROR, "Error opening sftp file: %s\n", ssh_get_error(s->session));

126 ret = AVERROR(EIO);

127 goto fail;

128 }

129

130 if (!(stat = sftp_fstat(s->file))) {

131 av_log(h, AV_LOG_WARNING, "Cannot stat remote file %s.\n", path);

132 s->filesize = -1;

133 } else {

134 s->filesize = stat->size;

135 sftp_attributes_free(stat);

136 }

137

138 return 0;

139

140 fail:

141 libssh_close(h);

142 return ret;

143 }

144

145 static int64_t libssh_seek(URLContext *h, int64_t pos, int whence)

146 {

147 LIBSSHContext *s = h->priv_data;

148 int64_t newpos;

149

150 if (s->filesize == -1 && (whence == AVSEEK_SIZE || whence == SEEK_END)) {

151 av_log(h, AV_LOG_ERROR, "Error during seeking.\n");

152 return AVERROR(EIO);

153 }

154

155 switch(whence) {

156 case AVSEEK_SIZE:

157 return s->filesize;

158 case SEEK_SET:

159 newpos = pos;

160 break;

161 case SEEK_CUR:

162 newpos = sftp_tell64(s->file) + pos;

163 break;

164 case SEEK_END:

165 newpos = s->filesize + pos;

166 break;

167 default:

168 return AVERROR(EINVAL);

169 }

170

171 if (sftp_seek64(s->file, newpos)) {

172 av_log(h, AV_LOG_ERROR, "Error during seeking.\n");

173 return AVERROR(EIO);

174 }

175

176 return newpos;

177 }

178

179 static int libssh_read(URLContext *h, unsigned char *buf, int size)

180 {

181 LIBSSHContext *s = h->priv_data;

182 int bytes_read;

183

184 if ((bytes_read = sftp_read(s->file, buf, size)) < 0) {

185 av_log(h, AV_LOG_ERROR, "Read error.\n");

186 return AVERROR(EIO);

187 }

188 return bytes_read;

189 }

190

191 static int libssh_write(URLContext *h, const unsigned char *buf, int size)

192 {

193 LIBSSHContext *s = h->priv_data;

194 int bytes_written;

195

196 if ((bytes_written = sftp_write(s->file, buf, size)) < 0) {

197 av_log(h, AV_LOG_ERROR, "Write error.\n");

198 return AVERROR(EIO);

199 }

200 return bytes_written;

201 }

202

203 #define OFFSET(x) offsetof(LIBSSHContext, x)

204 #define D AV_OPT_FLAG_DECODING_PARAM

205 #define E AV_OPT_FLAG_ENCODING_PARAM

206 static const AVOption options[] = {

207 {"timeout", "set timeout of socket I/O operations", OFFSET(rw_timeout), AV_OPT_TYPE_INT, {.i64 = -1}, -1, INT_MAX, D|E },

208 {"truncate", "Truncate existing files on write", OFFSET(trunc), AV_OPT_TYPE_INT, { .i64 = 1 }, 0, 1, E },

209 {NULL}

210 };

211

212 static const AVClass libssh_context_class = {

213 .class_name = "libssh",

214 .item_name = av_default_item_name,

215 .option = options,

216 .version = LIBAVUTIL_VERSION_INT,

217 };

218

219 URLProtocol ff_libssh_protocol = {

220 .name = "sftp",

221 .url_open = libssh_open,

222 .url_read = libssh_read,

223 .url_write = libssh_write,

224 .url_seek = libssh_seek,

225 .url_close = libssh_close,

226 .priv_data_size = sizeof(LIBSSHContext),

227 .priv_data_class = &libssh_context_class,

228 .flags = URL_PROTOCOL_FLAG_NETWORK,

229 };

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