Zabbix

/*

** Zabbix

** Copyright (C) 2001-2023 Zabbix SIA

**

** This program is free software; you can redistribute it and/or modify

** it under the terms of the GNU General Public License as published by

** the Free Software Foundation; either version 2 of the License, or

** (at your option) any later version.

**

** This program 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 General Public License for more details.

**

** You should have received a copy of the GNU General Public License

** along with this program; if not, write to the Free Software

** Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.

**/

​

#include "ssh_run.h"

​

#include <libssh2.h>

​

#include "zbxcomms.h"

#include "zbxlog.h"

#include "zbxnum.h"

#include "zbxfile.h"

​

#if !defined(HAVE_LIBSSH2_METHOD_KEX) && !defined(HAVE_LIBSSH2_METHOD_HOSTKEY) && \

        !defined(HAVE_LIBSSH2_METHOD_CRYPT_CS) && !defined(HAVE_LIBSSH2_METHOD_CRYPT_SC) && \

        !defined(HAVE_LIBSSH2_METHOD_MAC_CS) && !defined(HAVE_LIBSSH2_METHOD_MAC_SC)

#define HAVE_NO_LIBSSH2_METHODS 1

#endif

​

/* the size of temporary buffer used to read from data channel */

#define DATA_BUFFER_SIZE    4096

​

extern char *CONFIG_SSH_KEY_LOCATION;

​

static ZBX_THREAD_LOCAL const char  *password;

​

#ifndef HAVE_NO_LIBSSH2_METHODS

static int  ssh_set_options(LIBSSH2_SESSION *session, int type, const char *key_str, const char *value,

        char **err_msg)

{

    int res, ret = SUCCEED;

​

    zabbix_log(LOG_LEVEL_DEBUG, "In %s() key_str:'%s' value:'%s'", __func__, key_str, value);

​

    if (0 > (res = libssh2_session_method_pref(session, type, value)) && res != LIBSSH2_ERROR_EAGAIN)

    {

        char        *err;

        const char  **algs;

        int     rc;

​

        if (LIBSSH2_ERROR_NONE != libssh2_session_last_error(session, &err, NULL, 0))

            *err_msg = zbx_dsprintf(NULL, "Cannot set SSH option \"%s\": %s.", key_str, err);

        else

            *err_msg = zbx_dsprintf(NULL, "Cannot set SSH option \"%s\".", key_str);

​

        if (0 < (rc = libssh2_session_supported_algs(session, type, &algs)))

        {

            *err_msg = zbx_strdcat(*err_msg, " Supported values are: ");