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/*
* Copyright (c) 2016 Chris Johns <chrisj@rtems.org>. 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.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``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 OR CONTRIBUTORS 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.
*/
/*
* Telnet service. To use add to rc.conf:
*
* telnetd_enable="YES"
* telnet_options="-p 21 -s 32768 -P 8 -L"
*
* The options defaults are show. The options are:
*
* -C conns : Maximum connections (ptys).
* -P priority : Telnet thread priority (RTEMS Classis API).
* -L : Login using /etc/passwd
*/
#include <errno.h>
#include <stddef.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#define __need_getopt_newlib
#include <getopt.h>
#include <rtems/telnetd.h>
#include <machine/rtems-bsd-rc-conf-services.h>
/*
* Stack size. Use RTEMS_BSD_CONFIG_TELNETD_STACK_SIZE.
*/
extern int rtems_telnetd_stack_size;
__weak_reference(_rtems_telnetd_stack_size, rtems_telnetd_stack_size);
int _rtems_telnetd_stack_size;
/*
* By default no login.
*/
static bool telnet_login;
static void
hydra_telnetd_command(char* device, void* arg)
{
rtems_shell_login_check_t login = NULL;
rtems_shell_env_t shell_env;
if (telnet_login)
login = rtems_shell_login_check;
rtems_shell_dup_current_env(&shell_env);
shell_env.devname = device;
shell_env.taskname = "TELn";
shell_env.exit_shell = false;
shell_env.forever = 0;
shell_env.echo = 0;
shell_env.input = NULL;
shell_env.output = NULL;
shell_env.output_append = 0;
shell_env.wake_on_end = 0;
shell_env.login_check = login;
rtems_shell_main_loop (&shell_env);
}
static int
telnetd_service(rtems_bsd_rc_conf* rc_conf)
{
rtems_telnetd_config_table config = {
.priority = 100, /* Telnet task priority */
.stack_size = 32 * 1024, /* Stack size */
.command = hydra_telnetd_command, /* The telnetd command, runs the shell. */
};
rtems_bsd_rc_conf_argc_argv* aa;
int conns = 0;
int r;
if (rtems_telnetd_stack_size != 0)
config.stack_size = rtems_telnetd_stack_size;
aa = rtems_bsd_rc_conf_argc_argv_create();
if (aa == NULL)
return -1;
r = rtems_bsd_rc_conf_find(rc_conf, "telnetd_enable", aa);
if (r == 0) {
rtems_status_code sc;
bool verbose = false;
if (aa->argc == 2 && strcasecmp("YES", aa->argv[1]) == 0) {
r = rtems_bsd_rc_conf_find(rc_conf, "telnetd_options", aa);
if (r == 0) {
struct getopt_data data;
char* end;
memset(&data, 0, sizeof(data));
while (true) {
int c;
c = getopt_r(aa->argc, aa->argv, "C:P:Lv", &data);
if (c == -1)
break;
switch (c) {
case 'C':
conns = strtoul(data.optarg, &end, 10);
if (conns == 0 || *end != '\0') {
fprintf(stderr, "error: telnet: invalid connections countt\n");
}
else {
config.client_maximum = conns;
}
break;
case 'P':
config.priority = strtoul(data.optarg, &end, 10);
if (config.priority == 0 || *end != '\0') {
fprintf(stderr, "error: telnetd: invalid priority\n");
config.priority = 100;
}
break;
case 'L':
telnet_login = true;
break;
case 'v':
verbose = true;
break;
case '?':
default:
fprintf(stderr, "error: telnetd: unknown option: %s\n", data.optarg);
break;
}
}
}
if (verbose) {
printf("telnetd: conns:%lu pri:%lu login:%s\n",
config.client_maximum, config.priority,
telnet_login == NULL ? "no" : "yes");
}
sc = rtems_telnetd_start(&config);
if (sc != RTEMS_SUCCESSFUL)
fprintf(stderr, "error: telnetd: %s\n", rtems_status_text(sc));
}
}
return 0;
}
void
rc_conf_telnetd_init(void* arg)
{
int r;
r = rtems_bsd_rc_conf_service_add("telnetd",
"after:network;before:ftpd;",
telnetd_service);
if (r < 0)
fprintf(stderr, "error: telnetd service add failed: %s\n", strerror(errno));
}
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