blob: a271b963a6929daf575530bbf1bb25bfd1d9bb7f [file] [log] [blame]
/*
* Copyright (C) Tildeslash Ltd. All rights reserved.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License version 3.
*
* 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 Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* In addition, as a special exception, the copyright holders give
* permission to link the code of portions of this program with the
* OpenSSL library under certain conditions as described in each
* individual source file, and distribute linked combinations
* including the two.
*
* You must obey the GNU Affero General Public License in all respects
* for all of the code used other than OpenSSL.
*/
#include "config.h"
#include <ctype.h>
#ifdef HAVE_STRING_H
#include <string.h>
#endif
#ifdef HAVE_ERRNO_H
#include <errno.h>
#endif
#include "protocol.h"
/**
* A simple 'SSH protocol version exchange' implemetation based on
* RFC (http://www.openssh.com/txt/draft-ietf-secsh-transport-14.txt)
*
* @file
*/
int check_ssh(Socket_T socket) {
char buf[STRLEN];
ASSERT(socket);
if(!socket_readln(socket, buf, sizeof(buf))) {
socket_setError(socket, "SSH: error receiving identification string -- %s\n", STRERROR);
return FALSE;
}
if(! Str_startsWith(buf, "SSH-")) {
socket_setError(socket, "SSH: protocol error %s\n", buf);
return FALSE;
}
/* send identification string back to server */
if(socket_write(socket, buf, strlen(buf)) <= 0) {
socket_setError(socket, "SSH: error sending identification string -- %s\n", STRERROR);
return FALSE;
}
/* Read one extra line to prevent the "Read from socket failed" warning */
socket_readln(socket, buf, sizeof(buf));
return TRUE;
}