103 lines
3.4 KiB
C
103 lines
3.4 KiB
C
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#if defined(ESP32)
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/* Copyright (C) 2010 Simon Josefsson
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* Author: Simon Josefsson
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*
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* Redistribution and use in source and binary forms,
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* with or without modification, are permitted provided
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* that the following conditions are met:
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*
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* Redistributions of source code must retain the above
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* copyright notice, this list of conditions and the
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* following disclaimer.
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*
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* Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following
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* disclaimer in the documentation and/or other materials
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* provided with the distribution.
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*
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* Neither the name of the copyright holder nor the names
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* of any other contributors may be used to endorse or
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* promote products derived from this software without
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* specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
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* CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
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* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
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* USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
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* OF SUCH DAMAGE.
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*
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*/
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#include "libssh2_priv.h"
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#include "transport.h" /* _libssh2_transport_write */
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/* Keep-alive stuff. */
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LIBSSH2_API void
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libssh2_keepalive_config (LIBSSH2_SESSION *session,
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int want_reply,
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unsigned interval)
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{
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if(interval == 1)
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session->keepalive_interval = 2;
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else
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session->keepalive_interval = interval;
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session->keepalive_want_reply = want_reply ? 1 : 0;
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}
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LIBSSH2_API int
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libssh2_keepalive_send (LIBSSH2_SESSION *session,
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int *seconds_to_next)
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{
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time_t now;
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if(!session->keepalive_interval) {
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if(seconds_to_next)
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*seconds_to_next = 0;
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return 0;
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}
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now = time(NULL);
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if(session->keepalive_last_sent + session->keepalive_interval <= now) {
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/* Format is
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"SSH_MSG_GLOBAL_REQUEST || 4-byte len || str || want-reply". */
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unsigned char keepalive_data[]
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= "\x50\x00\x00\x00\x15keepalive@libssh2.orgW";
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size_t len = sizeof(keepalive_data) - 1;
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int rc;
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keepalive_data[len - 1] =
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(unsigned char)session->keepalive_want_reply;
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rc = _libssh2_transport_send(session, keepalive_data, len, NULL, 0);
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/* Silently ignore PACKET_EAGAIN here: if the write buffer is
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already full, sending another keepalive is not useful. */
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if(rc && rc != LIBSSH2_ERROR_EAGAIN) {
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_libssh2_error(session, LIBSSH2_ERROR_SOCKET_SEND,
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"Unable to send keepalive message");
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return rc;
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}
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session->keepalive_last_sent = now;
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if(seconds_to_next)
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*seconds_to_next = session->keepalive_interval;
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}
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else if(seconds_to_next) {
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*seconds_to_next = (int) (session->keepalive_last_sent - now)
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+ session->keepalive_interval;
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}
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return 0;
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}
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#endif
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