static size_t php_ssh2_channel_stream_read(php_stream *stream, char *buf, size_t count TSRMLS_DC)
{
	php_ssh2_channel_data *abstract = (php_ssh2_channel_data*)stream->abstract;
	ssize_t readstate;
	LIBSSH2_SESSION *session;

	stream->eof = libssh2_channel_eof(abstract->channel);
	libssh2_channel_set_blocking(abstract->channel, abstract->is_blocking);
	session = (LIBSSH2_SESSION *)zend_fetch_resource(NULL TSRMLS_CC, abstract->session_rsrc, PHP_SSH2_SESSION_RES_NAME, NULL, 1, le_ssh2_session);

#ifdef PHP_SSH2_SESSION_TIMEOUT
	if (abstract->is_blocking) {
		libssh2_session_set_timeout(session, abstract->timeout);
	}
#endif

	readstate = libssh2_channel_read_ex(abstract->channel, abstract->streamid, buf, count);

#ifdef PHP_SSH2_SESSION_TIMEOUT
	if (abstract->is_blocking) {
		libssh2_session_set_timeout(session, 0);
	}
#endif
	if (readstate == LIBSSH2_ERROR_EAGAIN) {
		readstate = 0;
	}

	if (readstate < 0) {
		char *error_msg = NULL;
		if (libssh2_session_last_error(session, &error_msg, NULL, 0) == readstate) {
			php_error_docref(NULL TSRMLS_CC, E_WARNING, "Failure '%s' (%ld)", error_msg, readstate);
		}

		stream->eof = 1;
		readstate = 0;
	}
	return readstate;
}
示例#2
0
static int _git_ssh_setup_conn(
	ssh_subtransport *t,
	const char *url,
	const char *cmd,
	git_smart_subtransport_stream **stream)
{
	char *host=NULL, *port=NULL, *path=NULL, *user=NULL, *pass=NULL;
	const char *default_port="22";
	int auth_methods, error = 0;
	size_t i;
	ssh_stream *s;
	git_cred *cred = NULL;
	LIBSSH2_SESSION* session=NULL;
	LIBSSH2_CHANNEL* channel=NULL;

	t->current_stream = NULL;

	*stream = NULL;
	if (ssh_stream_alloc(t, url, cmd, stream) < 0)
		return -1;

	s = (ssh_stream *)*stream;
	s->session = NULL;
	s->channel = NULL;

	for (i = 0; i < ARRAY_SIZE(ssh_prefixes); ++i) {
		const char *p = ssh_prefixes[i];

		if (!git__prefixcmp(url, p)) {
			if ((error = gitno_extract_url_parts(&host, &port, &path, &user, &pass, url, default_port)) < 0)
				goto done;

			goto post_extract;
		}
	}
	if ((error = git_ssh_extract_url_parts(&host, &user, url)) < 0)
		goto done;
	port = git__strdup(default_port);
	GITERR_CHECK_ALLOC(port);

post_extract:
	if ((error = git_socket_stream_new(&s->io, host, port)) < 0 ||
	    (error = git_stream_connect(s->io)) < 0)
		goto done;

	if ((error = _git_ssh_session_create(&session, s->io)) < 0)
		goto done;

	if (t->owner->certificate_check_cb != NULL) {
		git_cert_hostkey cert = {{ 0 }}, *cert_ptr;
		const char *key;

		cert.parent.cert_type = GIT_CERT_HOSTKEY_LIBSSH2;

		key = libssh2_hostkey_hash(session, LIBSSH2_HOSTKEY_HASH_SHA1);
		if (key != NULL) {
			cert.type |= GIT_CERT_SSH_SHA1;
			memcpy(&cert.hash_sha1, key, 20);
		}

		key = libssh2_hostkey_hash(session, LIBSSH2_HOSTKEY_HASH_MD5);
		if (key != NULL) {
			cert.type |= GIT_CERT_SSH_MD5;
			memcpy(&cert.hash_md5, key, 16);
		}

		if (cert.type == 0) {
			giterr_set(GITERR_SSH, "unable to get the host key");
			error = -1;
			goto done;
		}

		/* We don't currently trust any hostkeys */
		giterr_clear();

		cert_ptr = &cert;

		error = t->owner->certificate_check_cb((git_cert *) cert_ptr, 0, host, t->owner->message_cb_payload);
		if (error < 0) {
			if (!giterr_last())
				giterr_set(GITERR_NET, "user cancelled hostkey check");

			goto done;
		}
	}

	/* we need the username to ask for auth methods */
	if (!user) {
		if ((error = request_creds(&cred, t, NULL, GIT_CREDTYPE_USERNAME)) < 0)
			goto done;

		user = git__strdup(((git_cred_username *) cred)->username);
		cred->free(cred);
		cred = NULL;
		if (!user)
			goto done;
	} else if (user && pass) {
		if ((error = git_cred_userpass_plaintext_new(&cred, user, pass)) < 0)
			goto done;
	}

	if ((error = list_auth_methods(&auth_methods, session, user)) < 0)
		goto done;

	error = GIT_EAUTH;
	/* if we already have something to try */
	if (cred && auth_methods & cred->credtype)
		error = _git_ssh_authenticate_session(session, cred);

	while (error == GIT_EAUTH) {
		if (cred) {
			cred->free(cred);
			cred = NULL;
		}

		if ((error = request_creds(&cred, t, user, auth_methods)) < 0)
			goto done;

		if (strcmp(user, git_cred__username(cred))) {
			giterr_set(GITERR_SSH, "username does not match previous request");
			error = -1;
			goto done;
		}

		error = _git_ssh_authenticate_session(session, cred);
	}

	if (error < 0)
		goto done;

	channel = libssh2_channel_open_session(session);
	if (!channel) {
		error = -1;
		ssh_error(session, "Failed to open SSH channel");
		goto done;
	}

	libssh2_channel_set_blocking(channel, 1);

	s->session = session;
	s->channel = channel;

	t->current_stream = s;

done:
	if (error < 0) {
		ssh_stream_free(*stream);

		if (session)
			libssh2_session_free(session);
	}

	if (cred)
		cred->free(cred);

	git__free(host);
	git__free(port);
	git__free(path);
	git__free(user);
	git__free(pass);

	return error;
}
示例#3
0
文件: parser.cpp 项目: alexadmin/main
int Parser::runCommand(QString command)
{
    // command channel
    //------------setup channel ----------------------
    LIBSSH2_CHANNEL *channel = NULL;
    channel = libssh2_channel_open_session(session_);
    if ( channel == NULL )
    {
        qDebug()<<"Failed to open a new channel\n";
        socket_->disconnectFromHost();
        return -1;
    }

    /* Force Data to on STDOUT and STDERR to be on seperate channels
     * read individually with *_read and *_read_stderr functions */
    libssh2_channel_handle_extended_data(channel,LIBSSH2_CHANNEL_EXTENDED_DATA_NORMAL);

    libssh2_channel_set_blocking(channel, 1);

    {
    int rc;
    while ((rc=libssh2_channel_exec(channel, command.toLocal8Bit().constData()))==LIBSSH2_ERROR_EAGAIN );
    if (rc)
    {
        return -1;
    }


    //-------read channel-----------
    int read;

    QString stdout_str;
    QString stderr_str;
    while(true)
    {
        //qDebug("libssh2_channel_read() >>>");

        {
            QByteArray byte_array;
            byte_array.resize(4096);
            char* buffer=byte_array.data();
            int buffer_size=byte_array.size();
            read = libssh2_channel_read(channel, buffer, buffer_size-10);
            if(read>0)
            {
                QByteArray debug = QByteArray(buffer, read);
                stdout_str.append(debug);
            }
            if(LIBSSH2_ERROR_EAGAIN == read)
            {
                qDebug("LIBSSH2_ERROR_EAGAIN");
                break;
            }
            else if(read  < 0)
            {
                qDebug(" error reading from std channel");
                closeChannel(channel);
                goto next_channel;
            }
        }
        {
            QByteArray byte_array;
            byte_array.resize(4096);
            char* buffer=byte_array.data();
            int buffer_size=byte_array.size();

read = libssh2_channel_read_stderr(channel, buffer, buffer_size-10);
            if(read>0)
            {
                QByteArray debug = QByteArray(buffer, read);
                stderr_str.append(debug);
            }
            if(LIBSSH2_ERROR_EAGAIN == read)
            {
                qDebug("LIBSSH2_ERROR_EAGAIN");
                break;
            }
            else if(read  < 0)
            {
                qDebug(" error reading from stderr channel");
                closeChannel(channel);
                goto next_channel;
            }
        }


        int i = libssh2_channel_eof(channel);
        if(i)
        {
            //qDebug("libssh2_channel_eof %i", i);
            closeChannel(channel);
            goto next_channel;
        }
    }
    next_channel:
    if(!stdout_str.isEmpty())
    {
        qDebug()<<"STDOUT:\n"<<stdout_str;
    }
    if(!stderr_str.isEmpty())
    {
        qDebug()<<"STDERR:\n"<<stderr_str;
    }
    }
    return 1;
}
示例#4
0
文件: ssh.c 项目: Posnet/ctf3
static int _git_ssh_setup_conn(
	ssh_subtransport *t,
	const char *url,
	const char *cmd,
	git_smart_subtransport_stream **stream)
{
	char *host=NULL, *port=NULL, *path=NULL, *user=NULL, *pass=NULL;
	const char *default_port="22";
	ssh_stream *s;
	LIBSSH2_SESSION* session=NULL;
	LIBSSH2_CHANNEL* channel=NULL;

	*stream = NULL;
	if (ssh_stream_alloc(t, url, cmd, stream) < 0)
		return -1;

	s = (ssh_stream *)*stream;

	if (!git__prefixcmp(url, prefix_ssh)) {
		if (gitno_extract_url_parts(&host, &port, &path, &user, &pass, url, default_port) < 0)
			goto on_error;
	} else {
		if (git_ssh_extract_url_parts(&host, &user, url) < 0)
			goto on_error;
		port = git__strdup(default_port);
		GITERR_CHECK_ALLOC(port);
	}

	if (gitno_connect(&s->socket, host, port, 0) < 0)
		goto on_error;

	if (user && pass) {
		if (git_cred_userpass_plaintext_new(&t->cred, user, pass) < 0)
			goto on_error;
	} else if (t->owner->cred_acquire_cb) {
		if (t->owner->cred_acquire_cb(
				&t->cred, t->owner->url, user,
				GIT_CREDTYPE_USERPASS_PLAINTEXT |
				GIT_CREDTYPE_SSH_KEY |
				GIT_CREDTYPE_SSH_CUSTOM,
				t->owner->cred_acquire_payload) < 0)
			goto on_error;

		if (!t->cred) {
			giterr_set(GITERR_SSH, "Callback failed to initialize SSH credentials");
			goto on_error;
		}
	} else {
		giterr_set(GITERR_SSH, "Cannot set up SSH connection without credentials");
		goto on_error;
	}
	assert(t->cred);

	if (!user && !git_cred_has_username(t->cred)) {
		giterr_set_str(GITERR_NET, "Cannot authenticate without a username");
		goto on_error;
	}

	if (_git_ssh_session_create(&session, s->socket) < 0)
		goto on_error;

	if (_git_ssh_authenticate_session(session, user, t->cred) < 0)
		goto on_error;

	channel = libssh2_channel_open_session(session);
	if (!channel) {
		ssh_error(session, "Failed to open SSH channel");
		goto on_error;
	}

	libssh2_channel_set_blocking(channel, 1);

	s->session = session;
	s->channel = channel;

	t->current_stream = s;
	git__free(host);
	git__free(port);
	git__free(path);
	git__free(user);
	git__free(pass);

	return 0;

on_error:
	s->session = NULL;
	s->channel = NULL;
	t->current_stream = NULL;

	if (*stream)
		ssh_stream_free(*stream);

	git__free(host);
	git__free(port);
	git__free(user);
	git__free(pass);

	if (session)
		libssh2_session_free(session);

	return -1;
}
示例#5
0
文件: ssh.c 项目: KindDragon/libgit2
static int _git_ssh_setup_conn(
	ssh_subtransport *t,
	const char *url,
	const char *cmd,
	git_smart_subtransport_stream **stream)
{
	char *host=NULL, *port=NULL, *path=NULL, *user=NULL, *pass=NULL;
	const char *default_port="22";
	int auth_methods, error = 0;
	ssh_stream *s;
	git_cred *cred = NULL;
	LIBSSH2_SESSION* session=NULL;
	LIBSSH2_CHANNEL* channel=NULL;

	*stream = NULL;
	if (ssh_stream_alloc(t, url, cmd, stream) < 0)
		return -1;

	s = (ssh_stream *)*stream;

	if (!git__prefixcmp(url, prefix_ssh)) {
		if ((error = gitno_extract_url_parts(&host, &port, &path, &user, &pass, url, default_port)) < 0)
			goto on_error;
	} else {
		if ((error = git_ssh_extract_url_parts(&host, &user, url)) < 0)
			goto on_error;
		port = git__strdup(default_port);
		GITERR_CHECK_ALLOC(port);
	}

	/* we need the username to ask for auth methods */
	if (!user) {
		if ((error = request_creds(&cred, t, NULL, GIT_CREDTYPE_USERNAME)) < 0)
			goto on_error;

		user = git__strdup(((git_cred_username *) cred)->username);
		cred->free(cred);
		cred = NULL;
		if (!user)
			goto on_error;
	} else if (user && pass) {
		if ((error = git_cred_userpass_plaintext_new(&cred, user, pass)) < 0)
			goto on_error;
	}

	if ((error = gitno_connect(&s->socket, host, port, 0)) < 0)
		goto on_error;

	if ((error = _git_ssh_session_create(&session, s->socket)) < 0)
		goto on_error;

	if ((error = list_auth_methods(&auth_methods, session, user)) < 0)
		goto on_error;

	error = GIT_EAUTH;
	/* if we already have something to try */
	if (cred && auth_methods & cred->credtype)
		error = _git_ssh_authenticate_session(session, cred);

	while (error == GIT_EAUTH) {
		if (cred) {
			cred->free(cred);
			cred = NULL;
		}

		if ((error = request_creds(&cred, t, user, auth_methods)) < 0)
			goto on_error;

		if (strcmp(user, git_cred__username(cred))) {
			giterr_set(GITERR_SSH, "username does not match previous request");
			error = -1;
			goto on_error;
		}

		error = _git_ssh_authenticate_session(session, cred);
	}

	if (error < 0)
		goto on_error;

	channel = libssh2_channel_open_session(session);
	if (!channel) {
		error = -1;
		ssh_error(session, "Failed to open SSH channel");
		goto on_error;
	}

	libssh2_channel_set_blocking(channel, 1);

	s->session = session;
	s->channel = channel;

	t->current_stream = s;
	if (cred)
		cred->free(cred);

	git__free(host);
	git__free(port);
	git__free(path);
	git__free(user);
	git__free(pass);

	return 0;

on_error:
	s->session = NULL;
	s->channel = NULL;
	t->current_stream = NULL;

	if (*stream)
		ssh_stream_free(*stream);

	if (cred)
		cred->free(cred);

	git__free(host);
	git__free(port);
	git__free(user);
	git__free(pass);

	if (session)
		libssh2_session_free(session);

	return error;
}
示例#6
0
/* {{{ libssh2_publickey_init
 * Startup the publickey subsystem
 */
LIBSSH2_API LIBSSH2_PUBLICKEY *libssh2_publickey_init(LIBSSH2_SESSION *session)
{
	LIBSSH2_PUBLICKEY *pkey = NULL;
	LIBSSH2_CHANNEL *channel = NULL;
	unsigned char buffer[19];
	/*	packet_len(4) + 
		version_len(4) + 
		"version"(7) + 
		version_num(4) */
	unsigned char *s, *data = NULL;
	unsigned long data_len;
	int response;

#ifdef LIBSSH2_DEBUG_PUBLICKEY
	_libssh2_debug(session, LIBSSH2_DBG_PUBLICKEY, "Initializing publickey subsystem");
#endif

	channel = libssh2_channel_open_session(session);
	if (!channel) {
		libssh2_error(session, LIBSSH2_ERROR_CHANNEL_FAILURE, "Unable to startup channel", 0);
		goto err_exit;
	}
	if (libssh2_channel_subsystem(channel, "publickey")) {
		libssh2_error(session, LIBSSH2_ERROR_CHANNEL_FAILURE, "Unable to request publickey subsystem", 0);
		goto err_exit;
	}

	libssh2_channel_set_blocking(channel, 1);
	libssh2_channel_handle_extended_data(channel, LIBSSH2_CHANNEL_EXTENDED_DATA_IGNORE);

	pkey = LIBSSH2_ALLOC(session, sizeof(LIBSSH2_PUBLICKEY));
	if (!pkey) {
		libssh2_error(session, LIBSSH2_ERROR_ALLOC, "Unable to allocate a new publickey structure", 0);
		goto err_exit;
	}
	pkey->channel = channel;
	pkey->version = 0;

	s = buffer;
	libssh2_htonu32(s, 4 + (sizeof("version") - 1) + 4);	s += 4;
	libssh2_htonu32(s, sizeof("version") - 1);				s += 4;
	memcpy(s, "version", sizeof("version") - 1);			s += sizeof("version") - 1;
	libssh2_htonu32(s, LIBSSH2_PUBLICKEY_VERSION);			s += 4;

#ifdef LIBSSH2_DEBUG_PUBLICKEY
	_libssh2_debug(session, LIBSSH2_DBG_PUBLICKEY, "Sending publickey version packet advertising version %d support", (int)LIBSSH2_PUBLICKEY_VERSION);
#endif
    if ((s - buffer) != libssh2_channel_write(channel, buffer, (s - buffer))) {
        libssh2_error(session, LIBSSH2_ERROR_SOCKET_SEND, "Unable to send publickey version packet", 0);
		goto err_exit;
    }

	while (1) {
		if (libssh2_publickey_packet_receive(pkey, &data, &data_len)) {
			libssh2_error(session, LIBSSH2_ERROR_SOCKET_TIMEOUT, "Timeout waiting for response from publickey subsystem", 0);
			goto err_exit;
		}

		s = data;
		if ((response = libssh2_publickey_response_id(&s, data_len)) < 0) {
			libssh2_error(session, LIBSSH2_ERROR_PUBLICKEY_PROTOCOL, "Invalid publickey subsystem response code", 0);
			goto err_exit;
		}

		switch (response) {
			case LIBSSH2_PUBLICKEY_RESPONSE_STATUS:
			/* Error */
			{
				unsigned long status, descr_len, lang_len;
				unsigned char *descr, *lang;
				
				status = libssh2_ntohu32(s);					s += 4;
				descr_len = libssh2_ntohu32(s);					s += 4;
				descr = s;										s += descr_len;
				lang_len = libssh2_ntohu32(s);					s += 4;
				lang = s;										s += lang_len;

				if (s > data + data_len) {
					libssh2_error(session, LIBSSH2_ERROR_PUBLICKEY_PROTOCOL, "Malformed publickey subsystem packet", 0);
					goto err_exit;
				}

				libssh2_publickey_status_error(NULL, session, status, descr, descr_len);
				goto err_exit;
			}
			case LIBSSH2_PUBLICKEY_RESPONSE_VERSION:
				/* What we want */
				pkey->version = libssh2_ntohu32(s);
				if (pkey->version > LIBSSH2_PUBLICKEY_VERSION) {
#ifdef LIBSSH2_DEBUG_PUBLICKEY
					_libssh2_debug(session, LIBSSH2_DBG_PUBLICKEY, "Truncating remote publickey version from %lu", pkey->version);
#endif
					pkey->version = LIBSSH2_PUBLICKEY_VERSION;
				}
#ifdef LIBSSH2_DEBUG_PUBLICKEY
				_libssh2_debug(session, LIBSSH2_DBG_PUBLICKEY, "Enabling publickey subsystem version %lu", pkey->version);
#endif
				LIBSSH2_FREE(session, data);
				return pkey;
			default:
				/* Unknown/Unexpected */
				libssh2_error(session, LIBSSH2_ERROR_PUBLICKEY_PROTOCOL, "Unexpected publickey subsystem response, ignoring", 0);
				LIBSSH2_FREE(session, data);
				data = NULL;
		}
	}

	/* Never reached except by direct goto */
 err_exit:
	if (channel) {
		libssh2_channel_close(channel);
	}
	if (pkey) {
		LIBSSH2_FREE(session, pkey);
	}
	if (data) {
		LIBSSH2_FREE(session, data);
	}
	return NULL;
}
示例#7
0
void cql_ccm_bridge_t::terminal_write(const string& command) {
  // enable blocking
  libssh2_channel_set_blocking(_ssh_internals->_channel, 1);
  libssh2_channel_write(_ssh_internals->_channel, command.c_str(), command.size());
}
示例#8
0
文件: ssh.c 项目: dmgctrl/libgit2
static int _git_ssh_setup_conn(
	ssh_subtransport *t,
	const char *url,
	const char *cmd,
	git_smart_subtransport_stream **stream
)
{
	char *host, *port=NULL, *user=NULL, *pass=NULL;
	const char *default_port="22";
	ssh_stream *s;
	LIBSSH2_SESSION* session=NULL;
	LIBSSH2_CHANNEL* channel=NULL;
	
	*stream = NULL;
	if (ssh_stream_alloc(t, url, cmd, stream) < 0)
		return -1;
	
	s = (ssh_stream *)*stream;
	
	if (!git__prefixcmp(url, prefix_ssh)) {
		url = url + strlen(prefix_ssh);
		if (gitno_extract_url_parts(&host, &port, &user, &pass, url, default_port) < 0)
			goto on_error;
	} else {
		if (git_ssh_extract_url_parts(&host, &user, url) < 0)
			goto on_error;
		port = git__strdup(default_port);
		GITERR_CHECK_ALLOC(port);
	}
	
	if (gitno_connect(&s->socket, host, port, 0) < 0)
		goto on_error;
	
	if (user && pass) {
		if (git_cred_userpass_plaintext_new(&t->cred, user, pass) < 0)
			goto on_error;
	} else {
		if (t->owner->cred_acquire_cb(&t->cred,
				t->owner->url,
				user,
				GIT_CREDTYPE_USERPASS_PLAINTEXT | GIT_CREDTYPE_SSH_KEYFILE_PASSPHRASE | GIT_CREDTYPE_SSH_PUBLICKEY,
				t->owner->cred_acquire_payload) < 0)
			return -1;
	}
	assert(t->cred);
	
	if (!user) {
		user = git__strdup(default_user);
	}
	
	if (_git_ssh_session_create(&session, s->socket) < 0)
		goto on_error;
	
    if (_git_ssh_authenticate_session(session, user, t->cred) < 0)
		goto on_error;
	
	channel = libssh2_channel_open_session(session);
	if (!channel)
        goto on_error;
	
	libssh2_channel_set_blocking(channel, 1);
	
	s->session = session;
	s->channel = channel;
	
	t->current_stream = s;
	git__free(host);
	git__free(port);
	git__free(user);
	git__free(pass);

	return 0;
	
on_error:
	if (*stream)
		ssh_stream_free(*stream);
	
	git__free(host);
	git__free(port);
	git__free(user);
	git__free(pass);

	if (session)
		libssh2_session_free(session), session = NULL;

	return -1;
}
示例#9
-1
文件: parser.cpp 项目: alexadmin/main
QString Parser::sshRequest(QString commandline)
{
    QString host_ip(this->sharedHost);
    QString user_name=this->sharedUser;
    QString pass_word=this->sharedPass;

    //---------- connection --------------
    int libssh2_error = libssh2_init(0);
    if(libssh2_error)
    {
        qDebug("libssh2_init() error: %d", libssh2_error);
        //return -2;
    }

    QTcpSocket socket;
    socket.connectToHost(host_ip, 22);
    if(!socket.waitForConnected())
    {
        qDebug("Error connecting to host %s", host_ip.toLocal8Bit().constData());
        //return -1;
    }

    LIBSSH2_SESSION *session = libssh2_session_init();
    if(!session)
    {
        qDebug("libssh2_session_init() failed");
        //return -2;
    }

    libssh2_error = libssh2_session_startup(session, socket.socketDescriptor());
    if(libssh2_error)
    {
        qDebug("libssh2_session_startup() error: %d", libssh2_error);
        //return -3;
    }

    {
    /* At this point we havn't yet authenticated.  The first thing to do
     * is check the hostkey's fingerprint against our known hosts Your app
     * may have it hard coded, may go to a file, may present it to the
     * user, that's your call
     */
    const char *fingerprint = libssh2_hostkey_hash(session, LIBSSH2_HOSTKEY_HASH_SHA1);
    }

    libssh2_userauth_list(session, user_name.toLocal8Bit().constData(), user_name.toLocal8Bit().length());
    if(libssh2_userauth_password(
        session,
        user_name.toLocal8Bit().constData(),
        pass_word.toLocal8Bit().constData()
    ))
    {
        qDebug("Password authentication failed");

        socket.disconnectFromHost();
        libssh2_session_disconnect(session, "Client disconnecting for error");
        libssh2_session_free(session);
        libssh2_exit();

        //return -4;
    }

    // command channel
    //------------setup channel ----------------------
    LIBSSH2_CHANNEL *channel = NULL;
    channel = libssh2_channel_open_session(session);
    int rc;
    if ( channel == NULL )
    {
        qDebug()<<"Failed to open a new channel\n";
        socket.disconnectFromHost();
        //return -1;
    }
    libssh2_channel_set_blocking(channel, 1);
    while ((rc=libssh2_channel_exec(channel, commandline.toLocal8Bit().constData()))==LIBSSH2_ERROR_EAGAIN );
    if (rc)
    {
        //return -1;
    }

    //-------read channel-----------
    int read;
    QByteArray byte_array;
    byte_array.resize(4096);
    char* buffer=byte_array.data();
    int buffer_size=byte_array.size();

    QString myOutPut;

    while(true)
    {
        {
            read = libssh2_channel_read(channel, buffer, buffer_size);
            QByteArray debug = QByteArray(buffer, read);

            //qDebug()<<"STDOUT: "<<debug.constData();
            myOutPut = debug.constData();
            qDebug() << myOutPut;
            if(LIBSSH2_ERROR_EAGAIN == read)
            {
                qDebug("LIBSSH2_ERROR_EAGAIN");
                break;
            }
            else if(read  < 0)
            {
                qDebug(" error reading from channel");
                closeChannel(channel);
                goto next_channel;
            }

        }
        {
            read = libssh2_channel_read_stderr(channel, buffer, buffer_size);
            QByteArray debug = QByteArray(buffer, read);
            qDebug()<<"STDERR: "<<debug.constData();
            if(LIBSSH2_ERROR_EAGAIN == read)
            {
                qDebug("LIBSSH2_ERROR_EAGAIN");
                break;
            }
            else if(read  < 0)
            {
                qDebug(" error reading from channel");
                closeChannel(channel);
                goto next_channel;
            }

        }

        int i=0;

        i = libssh2_channel_eof(channel);
        if(i)
        {
            qDebug("libssh2_channel_eof %i", i);
            closeChannel(channel);
            goto next_channel;
        }
    }
next_channel:

    //------------ clean session
    socket.disconnectFromHost();

    libssh2_session_disconnect(session, "Client disconnecting normally");
    libssh2_session_free(session);
    libssh2_exit();

    return myOutPut;
}