/**************************************************************************** * apps/nshlib/nsh_telnetd.c * * Copyright (C) 2007-2013, 2016-2017, 2019 Gregory Nutt. All rights * reserved. * Author: Gregory Nutt * * 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. Neither the name Gregory Nutt nor the names of its contributors may be * used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS 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 * COPYRIGHT OWNER 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. * ****************************************************************************/ /**************************************************************************** * Included Files ****************************************************************************/ #include #include #include #include #include #include #include "netutils/telnetd.h" #ifdef CONFIG_TELNET_CHARACTER_MODE #ifdef CONFIG_NSH_CLE # include "system/cle.h" #else # include "system/readline.h" #endif #endif #include "nsh.h" #include "nsh_console.h" #ifdef CONFIG_NSH_TELNET /**************************************************************************** * Private Types ****************************************************************************/ enum telnetd_state_e { TELNETD_NOTRUNNING = 0, TELNETD_STARTED, TELNETD_RUNNING }; /**************************************************************************** * Private Functions ****************************************************************************/ /**************************************************************************** * Name: nsh_telnetmain ****************************************************************************/ static int nsh_telnetmain(int argc, char *argv[]) { FAR struct console_stdio_s *pstate = nsh_newconsole(); FAR struct nsh_vtbl_s *vtbl; int ret; DEBUGASSERT(pstate != NULL); vtbl = &pstate->cn_vtbl; ninfo("Session [%d] Started\n", getpid()); #ifdef CONFIG_NSH_TELNET_LOGIN /* Login User and Password Check */ if (nsh_telnetlogin(pstate) != OK) { nsh_exit(vtbl, 1); return -1; /* nsh_exit does not return */ } #endif /* CONFIG_NSH_TELNET_LOGIN */ /* The following logic mostly the same as the login in nsh_session.c. It * differs only in that gets() is called to get the command instead of * readline(). */ /* Present a greeting and possibly a Message of the Day (MOTD) */ fputs(g_nshgreeting, pstate->cn_outstream); #ifdef CONFIG_NSH_MOTD # ifdef CONFIG_NSH_PLATFORM_MOTD /* Output the platform message of the day */ platform_motd(vtbl->iobuffer, IOBUFFERSIZE); fprintf(pstate->cn_outstream, "%s/n", vtbl->iobuffer); # else /* Output the fixed message of the day */ fprintf(pstate->cn_outstream, "%s/n", g_nshmotd); # endif #endif fflush(pstate->cn_outstream); /* Execute the startup script. If standard console is also defined, then * we will not bother with the initscript here (although it is safe to * call nshinitscript multiple times). */ #if defined(CONFIG_NSH_ROMFSETC) && !defined(CONFIG_NSH_CONSOLE) nsh_initscript(vtbl); #endif /* Execute the login script */ #ifdef CONFIG_NSH_ROMFSRC nsh_loginscript(vtbl); #endif /* Then enter the command line parsing loop */ for (; ; ) { /* Get the next line of input from the Telnet client */ #ifdef CONFIG_TELNET_CHARACTER_MODE #ifdef CONFIG_NSH_CLE /* cle() returns a negated errno value on failure (errno is not set) */ ret = cle(pstate->cn_line, g_nshprompt, CONFIG_NSH_LINELEN, INSTREAM(pstate), OUTSTREAM(pstate)); if (ret < 0) { fprintf(pstate->cn_errstream, g_fmtcmdfailed, "nsh_telnetmain", "cle", NSH_ERRNO_OF(-ret)); nsh_exit(vtbl, 1); } #else /* Display the prompt string */ fputs(g_nshprompt, pstate->cn_outstream); fflush(pstate->cn_outstream); /* readline() returns EOF on failure (errno is not set) */ ret = readline(pstate->cn_line, CONFIG_NSH_LINELEN, INSTREAM(pstate), OUTSTREAM(pstate)); if (ret == EOF) { /* NOTE: readline() does not set the errno variable, but perhaps we * will be lucky and it will still be valid. */ fprintf(pstate->cn_errstream, g_fmtcmdfailed, "nsh_telnetmain", "readline", NSH_ERRNO); nsh_exit(vtbl, 1); } #endif #else /* Display the prompt string */ fputs(g_nshprompt, pstate->cn_outstream); fflush(pstate->cn_outstream); /* fgets() returns NULL on failure (errno will be set) */ if (fgets(pstate->cn_line, CONFIG_NSH_LINELEN, INSTREAM(pstate)) == NULL) { fprintf(pstate->cn_errstream, g_fmtcmdfailed, "nsh_telnetmain", "fgets", NSH_ERRNO); nsh_exit(vtbl, 1); } ret = strlen(pstate->cn_line); #endif /* Parse process the received Telnet command */ nsh_parse(vtbl, pstate->cn_line); fflush(pstate->cn_outstream); } /* Clean up */ nsh_exit(vtbl, 0); /* We do not get here, but this is necessary to keep some compilers happy */ UNUSED(ret); return OK; } /**************************************************************************** * Public Functions ****************************************************************************/ /**************************************************************************** * Name: nsh_telnetstart * * Description: * nsh_telnetstart() starts the Telnet daemon that will allow multiple * NSH connections via Telnet. This function returns immediately after * the daemon has been started. * * Input Parameters: * family - Provides the IP family to use by the server. May be either * AF_INET or AF_INET6. This is needed because both both may be * enabled in the configuration. * * All of the other properties of the Telnet daemon are controlled by * NuttX configuration settings. * * Returned Values: * The task ID of the Telnet daemon was successfully started. A negated * errno value will be returned on failure. * ****************************************************************************/ int nsh_telnetstart(sa_family_t family) { static enum telnetd_state_e state = TELNETD_NOTRUNNING; int ret = OK; if (state == TELNETD_NOTRUNNING) { struct telnetd_config_s config; /* There is a tiny race condition here if two tasks were to try to * start the Telnet daemon concurrently. */ state = TELNETD_STARTED; /* Initialize any USB tracing options that were requested. If * standard console is also defined, then we will defer this step to * the standard console. */ #if defined(CONFIG_NSH_USBDEV_TRACE) && !defined(CONFIG_NSH_CONSOLE) usbtrace_enable(TRACE_BITSET); #endif /* Configure the telnet daemon */ config.d_port = HTONS(CONFIG_NSH_TELNETD_PORT); config.d_priority = CONFIG_NSH_TELNETD_DAEMONPRIO; config.d_stacksize = CONFIG_NSH_TELNETD_DAEMONSTACKSIZE; config.t_priority = CONFIG_NSH_TELNETD_CLIENTPRIO; config.t_stacksize = CONFIG_NSH_TELNETD_CLIENTSTACKSIZE; config.t_entry = nsh_telnetmain; /* Start the telnet daemon */ ninfo("Starting the Telnet daemon\n"); #ifdef CONFIG_NET_IPv4 if (family == AF_UNSPEC || family == AF_INET) { config.d_family = AF_INET; ret = telnetd_start(&config); if (ret < 0) { _err("ERROR: Failed to start the Telnet IPv4 daemon: %d\n", ret); } else { state = TELNETD_RUNNING; } } #endif #ifdef CONFIG_NET_IPv6 if (family == AF_UNSPEC || family == AF_INET6) { config.d_family = AF_INET6; ret = telnetd_start(&config); if (ret < 0) { _err("ERROR: Failed to start the Telnet IPv6 daemon: %d\n", ret); } else { state = TELNETD_RUNNING; } } #endif if (state == TELNETD_STARTED) { state = TELNETD_NOTRUNNING; } } return ret; } /**************************************************************************** * Name: cmd_telnetd * * Description: * The Telnet daemon may be started either programmatically by calling * nsh_telnetstart() or it may be started from the NSH command line using * this telnetd command. * * Normally this command would be suppressed with CONFIG_NSH_DISABLE_TELNETD * because the Telnet daemon is automatically started in nsh_main.c. The * exception is when CONFIG_NETINIT_NETLOCAL is selected. IN that case, the * network is not enabled at initialization but rather must be enabled from * the NSH command line or via other applications. * * In that case, calling nsh_telnetstart() before the the network is * initialized will fail. * * Input Parameters: * None. All of the properties of the Telnet daemon are controlled by * NuttX configuration setting. * * Returned Values: * OK is returned on success; ERROR is return on failure. * ****************************************************************************/ #ifndef CONFIG_NSH_DISABLE_TELNETD int cmd_telnetd(FAR struct nsh_vtbl_s *vtbl, int argc, char **argv) { sa_family_t family = AF_UNSPEC; /* If both IPv6 nd IPv4 are enabled, then the address family must * be specified on the command line. */ #if defined(CONFIG_NET_IPv4) && defined(CONFIG_NET_IPv6) if (argc >= 2) { family = (strcmp(argv[1], "ipv6") == 0) ? AF_INET6 : AF_INET; } #endif return nsh_telnetstart(family) < 0 ? ERROR : OK; } #endif #endif /* CONFIG_NSH_TELNET */