tcl_server.c 5.33 KB
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/***************************************************************************
 *   Copyright (C) 2008                                                    *
 *                                                                         *
 *   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.,                                       *
 *   59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.             *
 ***************************************************************************/

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include <stdarg.h>
#include "tcl_server.h"

#include "log.h"
#include "command.h"

#include <stdlib.h>
#include <unistd.h>
#include <errno.h>
#include <string.h>
#include <ctype.h>

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#define TCL_SERVER_VERSION	"TCL Server 0.1"
#define TCL_MAX_LINE		(4096)
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typedef struct tcl_connection_s {
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	int tc_linedrop;
	int tc_lineoffset;
	char tc_line[TCL_MAX_LINE];
	int tc_outerror; /* flag an output error */
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} tcl_connection_t;

extern Jim_Interp *interp;
static unsigned short tcl_port = 0;

/* commands */
static int handle_tcl_port_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc);

/* handlers */
static int tcl_new_connection(connection_t *connection);
static int tcl_input(connection_t *connection);
static int tcl_output(connection_t *connection, const void *buf, ssize_t len);
static int tcl_closed(connection_t *connection);

/* write data out to a socket.
 *
 * this is a blocking write, so the return value must equal the length, if
 * that is not the case then flag the connection with an output error.
 */
int tcl_output(connection_t *connection, const void *data, ssize_t len)
{
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	ssize_t wlen;
	tcl_connection_t *tclc;
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	tclc = connection->priv;
	if (tclc->tc_outerror)
		return ERROR_SERVER_REMOTE_CLOSED;
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	wlen = write_socket(connection->fd, data, len);
	if (wlen == len)
		return ERROR_OK;
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	LOG_ERROR("error during write: %d != %d", (int)wlen, (int)len);
	tclc->tc_outerror = 1;
	return ERROR_SERVER_REMOTE_CLOSED;
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}

/* connections */
static int tcl_new_connection(connection_t *connection)
{
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	tcl_connection_t *tclc;
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	tclc = malloc(sizeof(tcl_connection_t));
	if (tclc == NULL)
		return ERROR_CONNECTION_REJECTED;
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	memset(tclc, 0, sizeof(tcl_connection_t));
	connection->priv = tclc;
	return ERROR_OK;
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}

static int tcl_input(connection_t *connection)
{
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	int retval;
	int i;
	ssize_t rlen;
	const char *result;
	int reslen;
	tcl_connection_t *tclc;
	char in[256];

	rlen = read_socket(connection->fd, &in, sizeof(in));
	if (rlen <= 0) {
		if (rlen < 0)
			LOG_ERROR("error during read: %s", strerror(errno));
		return ERROR_SERVER_REMOTE_CLOSED;
	}

	tclc = connection->priv;
	if (tclc == NULL)
		return ERROR_CONNECTION_REJECTED;

	/* push as much data into the line as possible */
	for (i = 0; i < rlen; i++)
	{
		if (!isprint(in[i]) && !isspace(in[i]))
		{
			/* drop this line */
			tclc->tc_linedrop = 1;
			continue;
		}

		/* buffer the data */
		tclc->tc_line[tclc->tc_lineoffset] = in[i];
		if (tclc->tc_lineoffset < TCL_MAX_LINE)
			tclc->tc_lineoffset++;
		else
			tclc->tc_linedrop = 1;

		if (in[i] != '\n')
			continue;

		/* process the line */
		if (tclc->tc_linedrop) {
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#define ESTR "line too long\n"
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			retval = tcl_output(connection, ESTR, sizeof(ESTR));
			if (retval != ERROR_OK)
				return retval;
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#undef ESTR
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		}
		else {
			tclc->tc_line[tclc->tc_lineoffset-1] = '\0';
			retval = Jim_Eval(interp, tclc->tc_line);
			result = Jim_GetString(Jim_GetResult(interp), &reslen);
			retval = tcl_output(connection, result, reslen);
			if (retval != ERROR_OK)
				return retval;
			if (memchr(result, '\n', reslen) == NULL)
				tcl_output(connection, "\n", 1);
		}
		
		tclc->tc_lineoffset = 0;
		tclc->tc_linedrop = 0;
	}

	return ERROR_OK;
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}

static int tcl_closed(connection_t *connection)
{
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	/* cleanup connection context */
	if (connection->priv) {
		free(connection->priv);
		connection->priv = NULL;
	}
	return ERROR_OK;
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}

int tcl_init(void)
{
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	int retval;
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	if (tcl_port == 0)
	{
		LOG_WARNING("no tcl port specified, using default port 6666");
		tcl_port = 6666;
	}
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	retval = add_service("tcl", CONNECTION_TCL, tcl_port, 1, tcl_new_connection, tcl_input, tcl_closed, NULL);
	return retval;
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}

int tcl_register_commands(command_context_t *cmd_ctx)
{
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	register_command(cmd_ctx, NULL, "tcl_port", handle_tcl_port_command, COMMAND_CONFIG, "");
	return ERROR_OK;
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}

static int handle_tcl_port_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc)
{
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	if (argc == 1) {
		tcl_port = strtoul(args[0], NULL, 0);
	}
	return ERROR_OK;
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}