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-rw-r--r--libavformat/libssh.c318
1 files changed, 318 insertions, 0 deletions
diff --git a/libavformat/libssh.c b/libavformat/libssh.c
new file mode 100644
index 0000000000..3ec60cb8f4
--- /dev/null
+++ b/libavformat/libssh.c
@@ -0,0 +1,318 @@
+/*
+ * 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>
+#define LIBSSH_STATIC
+#include <libssh/sftp.h>
+#include "libavutil/avstring.h"
+#include "libavutil/opt.h"
+#include "libavutil/attributes.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;
+ char *priv_key;
+} LIBSSHContext;
+
+static av_cold int libssh_create_ssh_session(LIBSSHContext *libssh, const char* hostname, unsigned int port)
+{
+ static const int verbosity = SSH_LOG_NOLOG;
+
+ if (!(libssh->session = ssh_new())) {
+ av_log(libssh, AV_LOG_ERROR, "SSH session creation failed: %s\n", ssh_get_error(libssh->session));
+ return AVERROR(ENOMEM);
+ }
+ ssh_options_set(libssh->session, SSH_OPTIONS_HOST, hostname);
+ ssh_options_set(libssh->session, SSH_OPTIONS_PORT, &port);
+ ssh_options_set(libssh->session, SSH_OPTIONS_LOG_VERBOSITY, &verbosity);
+ if (libssh->rw_timeout > 0) {
+ long timeout = libssh->rw_timeout * 1000;
+ ssh_options_set(libssh->session, SSH_OPTIONS_TIMEOUT_USEC, &timeout);
+ }
+
+ if (ssh_connect(libssh->session) != SSH_OK) {
+ av_log(libssh, AV_LOG_ERROR, "Connection failed: %s\n", ssh_get_error(libssh->session));
+ return AVERROR(EIO);
+ }
+
+ return 0;
+}
+
+static av_cold int libssh_authentication(LIBSSHContext *libssh, const char *user, const char *password)
+{
+ int authorized = 0;
+ int auth_methods;
+
+ if (user)
+ ssh_options_set(libssh->session, SSH_OPTIONS_USER, user);
+
+ if (ssh_userauth_none(libssh->session, NULL) == SSH_AUTH_SUCCESS)
+ return 0;
+
+ auth_methods = ssh_userauth_list(libssh->session, NULL);
+
+ if (auth_methods & SSH_AUTH_METHOD_PUBLICKEY) {
+ if (libssh->priv_key) {
+ ssh_string pub_key;
+ ssh_private_key priv_key;
+ int type;
+ if (!ssh_try_publickey_from_file(libssh->session, libssh->priv_key, &pub_key, &type)) {
+ priv_key = privatekey_from_file(libssh->session, libssh->priv_key, type, password);
+ if (ssh_userauth_pubkey(libssh->session, NULL, pub_key, priv_key) == SSH_AUTH_SUCCESS) {
+ av_log(libssh, AV_LOG_DEBUG, "Authentication successful with selected private key.\n");
+ authorized = 1;
+ }
+ } else {
+ av_log(libssh, AV_LOG_DEBUG, "Invalid key is provided.\n");
+ return AVERROR(EACCES);
+ }
+ } else if (ssh_userauth_autopubkey(libssh->session, password) == SSH_AUTH_SUCCESS) {
+ av_log(libssh, AV_LOG_DEBUG, "Authentication successful with auto selected key.\n");
+ authorized = 1;
+ }
+ }
+
+ if (!authorized && (auth_methods & SSH_AUTH_METHOD_PASSWORD)) {
+ if (ssh_userauth_password(libssh->session, NULL, password) == SSH_AUTH_SUCCESS) {
+ av_log(libssh, AV_LOG_DEBUG, "Authentication successful with password.\n");
+ authorized = 1;
+ }
+ }
+
+ if (!authorized) {
+ av_log(libssh, AV_LOG_ERROR, "Authentication failed.\n");
+ return AVERROR(EACCES);
+ }
+
+ return 0;
+}
+
+static av_cold int libssh_create_sftp_session(LIBSSHContext *libssh)
+{
+ if (!(libssh->sftp = sftp_new(libssh->session))) {
+ av_log(libssh, AV_LOG_ERROR, "SFTP session creation failed: %s\n", ssh_get_error(libssh->session));
+ return AVERROR(ENOMEM);
+ }
+
+ if (sftp_init(libssh->sftp) != SSH_OK) {
+ av_log(libssh, AV_LOG_ERROR, "Error initializing sftp session: %s\n", ssh_get_error(libssh->session));
+ return AVERROR(EIO);
+ }
+
+ return 0;
+}
+
+static av_cold int libssh_open_file(LIBSSHContext *libssh, int flags, const char *file)
+{
+ int access;
+
+ if ((flags & AVIO_FLAG_WRITE) && (flags & AVIO_FLAG_READ)) {
+ access = O_CREAT | O_RDWR;
+ if (libssh->trunc)
+ access |= O_TRUNC;
+ } else if (flags & AVIO_FLAG_WRITE) {
+ access = O_CREAT | O_WRONLY;
+ if (libssh->trunc)
+ access |= O_TRUNC;
+ } else
+ access = O_RDONLY;
+
+ /* 0666 = -rw-rw-rw- = read+write for everyone, minus umask */
+ if (!(libssh->file = sftp_open(libssh->sftp, file, access, 0666))) {
+ av_log(libssh, AV_LOG_ERROR, "Error opening sftp file: %s\n", ssh_get_error(libssh->session));
+ return AVERROR(EIO);
+ }
+
+ return 0;
+}
+
+static av_cold void libssh_stat_file(LIBSSHContext *libssh)
+{
+ sftp_attributes stat;
+
+ if (!(stat = sftp_fstat(libssh->file))) {
+ av_log(libssh, AV_LOG_WARNING, "Cannot stat remote file.\n");
+ libssh->filesize = -1;
+ } else {
+ libssh->filesize = stat->size;
+ sftp_attributes_free(stat);
+ }
+}
+
+static av_cold int libssh_close(URLContext *h)
+{
+ LIBSSHContext *libssh = h->priv_data;
+ if (libssh->file) {
+ sftp_close(libssh->file);
+ libssh->file = NULL;
+ }
+ if (libssh->sftp) {
+ sftp_free(libssh->sftp);
+ libssh->sftp = NULL;
+ }
+ if (libssh->session) {
+ ssh_disconnect(libssh->session);
+ ssh_free(libssh->session);
+ libssh->session = NULL;
+ }
+ return 0;
+}
+
+static av_cold int libssh_open(URLContext *h, const char *url, int flags)
+{
+ LIBSSHContext *libssh = h->priv_data;
+ char proto[10], path[MAX_URL_SIZE], hostname[1024], credencials[1024];
+ int port = 22, ret;
+ const char *user = NULL, *pass = NULL;
+ char *end = NULL;
+
+ 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 ((ret = libssh_create_ssh_session(libssh, hostname, port)) < 0)
+ goto fail;
+
+ user = av_strtok(credencials, ":", &end);
+ pass = av_strtok(end, ":", &end);
+
+ if ((ret = libssh_authentication(libssh, user, pass)) < 0)
+ goto fail;
+
+ if ((ret = libssh_create_sftp_session(libssh)) < 0)
+ goto fail;
+
+ if ((ret = libssh_open_file(libssh, flags, path)) < 0)
+ goto fail;
+
+ libssh_stat_file(libssh);
+
+ return 0;
+
+ fail:
+ libssh_close(h);
+ return ret;
+}
+
+static int64_t libssh_seek(URLContext *h, int64_t pos, int whence)
+{
+ LIBSSHContext *libssh = h->priv_data;
+ int64_t newpos;
+
+ if (libssh->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 libssh->filesize;
+ case SEEK_SET:
+ newpos = pos;
+ break;
+ case SEEK_CUR:
+ newpos = sftp_tell64(libssh->file) + pos;
+ break;
+ case SEEK_END:
+ newpos = libssh->filesize + pos;
+ break;
+ default:
+ return AVERROR(EINVAL);
+ }
+
+ if (newpos < 0) {
+ av_log(h, AV_LOG_ERROR, "Seeking to nagative position.\n");
+ return AVERROR(EINVAL);
+ }
+
+ if (sftp_seek64(libssh->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 *libssh = h->priv_data;
+ int bytes_read;
+
+ if ((bytes_read = sftp_read(libssh->file, buf, size)) < 0) {
+ av_log(libssh, 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 *libssh = h->priv_data;
+ int bytes_written;
+
+ if ((bytes_written = sftp_write(libssh->file, buf, size)) < 0) {
+ av_log(libssh, 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 },
+ {"private_key", "set path to private key", OFFSET(priv_key), AV_OPT_TYPE_STRING, { .str = NULL }, 0, 0, D|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,
+};
generated by cgit v1.2.3 (git 2.39.1) at 2024-07-09 09:51:24 +0000