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/*
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* callbacks.c - callback functions
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*
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* This file is part of the SSH Library
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*
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* Copyright (c) 2009-2013 by Andreas Schneider <asn@cryptomilk.org>
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*
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* The SSH Library is free software; you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as published by
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* the Free Software Foundation; either version 2.1 of the License, or (at your
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* option) any later version.
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*
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* The SSH Library is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
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* License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with the SSH Library; see the file COPYING. If not, write to
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* the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
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* MA 02111-1307, USA.
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*/
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#include "config.h"
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#include "libssh/callbacks.h"
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#include "libssh/session.h"
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#include "libssh/misc.h"
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#define is_callback_valid(session, cb) \
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(cb->size <= 0 || cb->size > 1024 * sizeof(void *))
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/* LEGACY */
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static void ssh_legacy_log_callback(int priority,
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const char *function,
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const char *buffer,
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void *userdata)
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{
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ssh_session session = (ssh_session)userdata;
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ssh_log_callback log_fn = session->common.callbacks->log_function;
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void *log_data = session->common.callbacks->userdata;
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(void)function; /* unused */
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log_fn(session, priority, buffer, log_data);
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}
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int ssh_set_callbacks(ssh_session session, ssh_callbacks cb) {
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if (session == NULL || cb == NULL) {
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return SSH_ERROR;
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}
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if (is_callback_valid(session, cb)) {
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ssh_set_error(session,
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SSH_FATAL,
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"Invalid callback passed in (badly initialized)");
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return SSH_ERROR;
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};
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session->common.callbacks = cb;
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/* LEGACY */
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if (ssh_get_log_callback() == NULL && cb->log_function) {
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ssh_set_log_callback(ssh_legacy_log_callback);
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ssh_set_log_userdata(session);
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}
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return 0;
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}
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static int ssh_add_set_channel_callbacks(ssh_channel channel,
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ssh_channel_callbacks cb,
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int prepend)
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{
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ssh_session session = NULL;
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int rc;
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if (channel == NULL || cb == NULL) {
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return SSH_ERROR;
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}
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session = channel->session;
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if (is_callback_valid(session, cb)) {
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ssh_set_error(session,
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SSH_FATAL,
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"Invalid callback passed in (badly initialized)");
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return SSH_ERROR;
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};
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if (channel->callbacks == NULL) {
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channel->callbacks = ssh_list_new();
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if (channel->callbacks == NULL){
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ssh_set_error_oom(session);
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return SSH_ERROR;
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}
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}
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if (prepend) {
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rc = ssh_list_prepend(channel->callbacks, cb);
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} else {
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rc = ssh_list_append(channel->callbacks, cb);
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}
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return rc;
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}
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int ssh_set_channel_callbacks(ssh_channel channel, ssh_channel_callbacks cb)
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{
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return ssh_add_set_channel_callbacks(channel, cb, 1);
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}
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int ssh_add_channel_callbacks(ssh_channel channel, ssh_channel_callbacks cb)
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{
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return ssh_add_set_channel_callbacks(channel, cb, 0);
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}
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int ssh_remove_channel_callbacks(ssh_channel channel, ssh_channel_callbacks cb)
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{
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struct ssh_iterator *it;
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if (channel == NULL || channel->callbacks == NULL){
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return SSH_ERROR;
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}
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it = ssh_list_find(channel->callbacks, cb);
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if (it == NULL){
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return SSH_ERROR;
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}
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ssh_list_remove(channel->callbacks, it);
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return SSH_OK;
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}
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int ssh_set_server_callbacks(ssh_session session, ssh_server_callbacks cb){
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if (session == NULL || cb == NULL) {
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return SSH_ERROR;
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}
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if (is_callback_valid(session, cb)) {
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ssh_set_error(session,
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SSH_FATAL,
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"Invalid callback passed in (badly initialized)");
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return SSH_ERROR;
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};
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session->server_callbacks = cb;
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return 0;
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}
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