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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 "tcl_server.h"
#define TCL_SERVER_VERSION "TCL Server 0.1"
#define TCL_MAX_LINE (4096)
typedef struct tcl_connection_s {
int tc_linedrop;
int tc_lineoffset;
char tc_line[TCL_MAX_LINE];
int tc_outerror; /* flag an output error */
} tcl_connection_t;
static unsigned short tcl_port = 6666;
/* 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)
{
ssize_t wlen;
tcl_connection_t *tclc;
tclc = connection->priv;
if (tclc->tc_outerror)
return ERROR_SERVER_REMOTE_CLOSED;
wlen = write_socket(connection->fd, data, len);
if (wlen == len)
return ERROR_OK;
LOG_ERROR("error during write: %d != %d", (int)wlen, (int)len);
tclc->tc_outerror = 1;
return ERROR_SERVER_REMOTE_CLOSED;
}
/* connections */
static int tcl_new_connection(connection_t *connection)
{
tcl_connection_t *tclc;
tclc = malloc(sizeof(tcl_connection_t));
if (tclc == NULL)
return ERROR_CONNECTION_REJECTED;
memset(tclc, 0, sizeof(tcl_connection_t));
connection->priv = tclc;
return ERROR_OK;
}
static int tcl_input(connection_t *connection)
{
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) {
#define ESTR "line too long\n"
retval = tcl_output(connection, ESTR, sizeof(ESTR));
if (retval != ERROR_OK)
return retval;
#undef ESTR
}
else {
tclc->tc_line[tclc->tc_lineoffset-1] = '\0';
retval = Jim_Eval_Named(interp, tclc->tc_line, "remote:connection",1);
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;
}
static int tcl_closed(connection_t *connection)
{
/* cleanup connection context */
if (connection->priv) {
free(connection->priv);
connection->priv = NULL;
}
return ERROR_OK;
}
int tcl_init(void)
{
int retval;
if (tcl_port == 0)
{
LOG_INFO("tcl port disabled");
return ERROR_OK;
}
retval = add_service("tcl", CONNECTION_TCP, tcl_port, 1, tcl_new_connection, tcl_input, tcl_closed, NULL);
return retval;
}
int tcl_register_commands(command_context_t *cmd_ctx)
{
register_command(cmd_ctx, NULL, "tcl_port", handle_tcl_port_command, COMMAND_CONFIG, "port on which to listen for incoming TCL syntax");
return ERROR_OK;
}
static int handle_tcl_port_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc)
{
if (argc == 1) {
tcl_port = strtoul(args[0], NULL, 0);
}
return ERROR_OK;
}
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