/* $Id: ssh_channel.c,v 1.6 2001/02/11 03:35:11 tls Exp $ */

/*
 * Copyright (c) 2000 Eric Haszlakiewicz.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#include <string.h>
#include <unistd.h>

#include "sshd.h"
#include "ssh_channel.h"
#include "ssh_util.h"

void 
channel_init(ssh_context_t * context)
{
	int i;

	memset(context->channels, 0, sizeof(context->channels));
	for (i = 0; i < MAX_CHANNEL; i++) {
		context->channels[i].fd_normal = -1;
		context->channels[i].fd_ext_stderr = -1;
	}
	return;
}

int
create_channel(ssh_context_t * context, int channel_id, int remote_id,
	       int window_size, int max_packet_size)
{
	struct channel_info *chan;

	if (channel_id > MAX_CHANNEL) {
		SSH_ERROR("Channel id out of range %d > %d", channel_id,
			  MAX_CHANNEL);
		return RET_FATAL;
	}
	chan = &context->channels[channel_id];
	if (chan->used) {
		SSH_DLOG(2, ("Failed: channel exists. %d\n", channel_id));
		return RET_FAIL;
	}
	chan->used = 1;
	chan->remote_id = remote_id;
	chan->fd_normal = -1;
	chan->fd_ext_stderr = -1;
	chan->is_closing = 0;
	chan->window_size = window_size;
	chan->max_packet_size = max_packet_size;

	return (RET_OK);
}

int
init_fdi(ssh_context_t *context, ssh_fdinfo_t *fdi, int channel_id,
         int fd_type, int fd, u_int8_t msg_type)
{
	memset(fdi, 0, sizeof(ssh_fdinfo_t));

	/* This is more like channel type instead of fd_type */
	switch(fd_type) {
	case SSH_FD_STDDATA:
	case SSH_FD_STDINDATA:
		/*
		 * V1 STDIN/OUT/ERR data.  Need room for
		 * type + binstr length
		 */
		fdi->header_size = 1 + 4;
		break;
	/* XXX Add other types here. */
	default:
		fdi->header_size = 0;
		break;
	}

	fdi->fd_type = fd_type;
	fdi->fd = fd;
	fdi->p_chan = find_channel(context, 0);

	fdi->xmitbuf = malloc(fdi->p_chan->max_packet_size);
	fdi->readbuf = fdi->xmitbuf + fdi->header_size;
	fdi->max_read_size = fdi->p_chan->max_packet_size - fdi->header_size;

	if (fdi->xmitbuf == NULL) {
		SSH_DLOG(1, ("Unable to allocate %d bytes for readbuf",
		             fdi->p_chan->max_packet_size));
		return (RET_FAIL);
	}

	switch(fd_type) {
	case SSH_FD_STDDATA:
	case SSH_FD_STDINDATA:
		fdi->xmitbuf[0] = msg_type;
		break;
	default:
		break;
	}

	return (RET_OK);
}

/*
 * Attach a FD to a channel.
 */
int 
chan_attach_fd(ssh_context_t * context, int fd, int type, int channel_id)
{
	if (channel_id > MAX_CHANNEL) {
		SSH_ERROR("Channel id out of range %d > %d", channel_id,
			  MAX_CHANNEL);
		return RET_FATAL;
	}
	if (!context->channels[channel_id].used) {
		SSH_ERROR("Channel not allocated. %d\n", channel_id);
		return RET_FATAL;
	}

	switch (type) {
	case FDTYPE_NORMAL:
		if (context->channels[channel_id].fd_normal >= 0)
			close(context->channels[channel_id].fd_normal);
		context->channels[channel_id].fd_normal = fd;
		break;
	case FDTYPE_EXT_STDERR:
		if (context->channels[channel_id].fd_ext_stderr >= 0)
			close(context->channels[channel_id].fd_ext_stderr);
		context->channels[channel_id].fd_ext_stderr = fd;
		break;
	}

	return (RET_OK);
}

/*
 * cleanup_channels:
 *    Do any cleanup required on all channels.
 */
void 
cleanup_channels(ssh_context_t * context)
{
	int i;

	for (i = 0; i < MAX_CHANNEL; i++) {
		/* Make sure it's been created */
		if (!context->channels[i].used)
			continue;

/*XAX free buffers in the fdinfo array?*/
		if (context->channels[i].fd_normal)
			close(context->channels[i].fd_normal);
		if (context->channels[i].fd_ext_stderr)
			close(context->channels[i].fd_ext_stderr);
	}
}