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https://github.com/oliverschmidt/contiki.git
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656 lines
17 KiB
C
656 lines
17 KiB
C
/*
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* Copyright (c) 2005, Swedish Institute of Computer Science
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the Institute nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* This file is part of the Contiki operating system.
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*
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* @(#)$Id: ctk-termtelnet.c,v 1.1 2007/05/26 21:46:28 oliverschmidt Exp $
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*/
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#include "contiki.h"
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#include "loader.h"
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#include "memb.h"
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#include "ctk-term.h"
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#include "contiki-conf.h"
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/*-----------------------------------------------------------------------------------*/
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/*
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* #defines and enums
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*/
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/*-----------------------------------------------------------------------------------*/
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/* Telnet special characters */
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#define TN_NULL 0
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#define TN_BL 7
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#define TN_BS 8
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#define TN_HT 9
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#define TN_LF 10
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#define TN_VT 11
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#define TN_FF 12
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#define TN_CR 13
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/* Commands preceeded by TN_IAC */
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#define TN_SE 240
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#define TN_NOP 241
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#define TN_DM 242
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#define TN_BRK 243
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#define TN_IP 244
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#define TN_AO 245
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#define TN_AYT 246
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#define TN_EC 247
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#define TN_EL 248
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#define TN_GA 249
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#define TN_SB 250
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#define TN_WILL 251
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#define TN_WONT 252
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#define TN_DO 253
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#define TN_DONT 254
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#define TN_IAC 255
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#define TNO_BIN 0
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#define TNO_ECHO 1
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#define TNO_SGA 3
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#define TNO_NAWS 31
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/* Telnet parsing states */
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enum {
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TNS_IDLE,
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TNS_IAC,
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TNS_OPT,
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TNS_SB,
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TNS_SBIAC
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};
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/* Telnet option negotiation states */
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enum {
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TNOS_NO,
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TNOS_WANTNO_EMPTY,
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TNOS_WANTNO_OPPOSITE,
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TNOS_WANTYES_EMPTY,
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TNOS_WANTYES_OPPOSITE,
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TNOS_YES
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};
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/* Telnet session states */
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enum {
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TTS_FREE, /* Not allocated */
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TTS_IDLE, /* No data to send and nothing sent */
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TTS_SEND_TNDATA, /* Sending telnet data */
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TTS_SEND_APPDATA /* Sending data from upper layers */
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};
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/* Number of options supported (we only need ECHO(1) and SGA(3) options) */
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#define TNSM_MAX_OPTIONS 4
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/* Max option replies in output queue */
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#define TNQLEN 20
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/* Number of option buffer */
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#define OPTION_POOL_SIZE 20
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/* Maximum number of telnet sessions */
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#ifdef CTK_TERM_CONF_MAX_TELNET_CLIENTS
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#define NUM_CONNS CTK_TERM_CONF_MAX_TELNET_CLIENTS
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#else
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#define NUM_CONNS 1
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#endif
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#ifdef CTK_TERM_CONF_TELNET_PORT
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#define PORT CTK_TERM_CONF_TELNET_PORT
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#else
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#define PORT 23
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#endif
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/*-----------------------------------------------------------------------------------*/
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/*
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* Structures
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*/
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/*-----------------------------------------------------------------------------------*/
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/* Telnet option state structure */
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struct TNOption {
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unsigned char state;
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unsigned char wants;
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};
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/* Telnet handling state structure */
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struct TNSMState
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{
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struct TNOption myOpt[TNSM_MAX_OPTIONS];
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struct TNOption hisOpt[TNSM_MAX_OPTIONS];
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unsigned char cmd;
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unsigned char state;
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};
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/* Telnet session state */
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struct telnet_state
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{
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unsigned char state;
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unsigned char* sendq[TNQLEN];
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struct TNSMState tnsm;
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struct ctk_term_state* termstate;
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};
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/*-----------------------------------------------------------------------------------*/
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/*
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* Local variables
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*/
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/*-----------------------------------------------------------------------------------*/
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/*static DISPATCHER_UIPCALL(ctk_termtelnet_appcall, state);*/
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static void ctk_termtelnet_appcall(void *state);
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EK_EVENTHANDLER(eventhandler, ev, data);
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EK_PROCESS(p, "CTK telnet server", EK_PRIO_NORMAL,
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eventhandler, NULL, NULL);
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/*static struct dispatcher_proc p =
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{DISPATCHER_PROC("CTK telnet server", NULL, NULL,
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ctk_termtelnet_appcall)};*/
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static ek_id_t id = EK_ID_NONE;
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/* Option negotiation buffer pool */
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struct size_3 {
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char size[3];
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};
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MEMB(telnetbuf, struct size_3, OPTION_POOL_SIZE);
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static int i,j;
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static struct telnet_state states[NUM_CONNS];
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/*-----------------------------------------------------------------------------------*/
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/*
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* Send an option reply on a connection
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*/
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/*-----------------------------------------------------------------------------------*/
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static void
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Reply(struct telnet_state* tns, unsigned char cmd, unsigned char opt)
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{
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unsigned char* buf = (unsigned char*)memb_alloc(&telnetbuf);
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if (buf != 0) {
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buf[0]=TN_IAC;
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buf[1]=cmd;
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buf[2]=opt;
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for (i=0; i < TNQLEN; i++) {
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if (tns->sendq[i] == 0) {
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tns->sendq[i] = buf;
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return;
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}
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}
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/* Queue is full. Drop it */
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memb_free(&telnetbuf, (char*)buf);
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}
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}
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/*-----------------------------------------------------------------------------------*/
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/*
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* Prepare for enabling one of remote side options.
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*/
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/*-----------------------------------------------------------------------------------*/
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static void
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EnableHisOpt(struct telnet_state* tns, unsigned char opt)
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{
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switch(tns->tnsm.hisOpt[opt].state) {
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case TNOS_NO:
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tns->tnsm.hisOpt[opt].wants = 1;
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tns->tnsm.hisOpt[opt].state = TNOS_WANTYES_EMPTY;
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Reply(tns, TN_DO, opt);
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break;
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case TNOS_WANTNO_EMPTY:
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tns->tnsm.hisOpt[opt].state = TNOS_WANTNO_OPPOSITE;
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break;
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case TNOS_WANTNO_OPPOSITE:
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break;
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case TNOS_WANTYES_EMPTY:
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tns->tnsm.hisOpt[opt].state = TNOS_YES;
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break;
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case TNOS_WANTYES_OPPOSITE:
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tns->tnsm.hisOpt[opt].state = TNOS_WANTYES_EMPTY;
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break;
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case TNOS_YES:
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break;
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}
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}
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/*-----------------------------------------------------------------------------------*/
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/*
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* Prepare for enabling one of my options
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*/
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/*-----------------------------------------------------------------------------------*/
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static void
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EnableMyOpt(struct telnet_state* tns, unsigned char opt)
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{
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if (opt < TNSM_MAX_OPTIONS) {
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switch(tns->tnsm.myOpt[opt].state) {
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case TNOS_NO:
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tns->tnsm.myOpt[opt].wants = 1;
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tns->tnsm.myOpt[opt].state = TNOS_WANTYES_EMPTY;
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Reply(tns, TN_WILL, opt);
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break;
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case TNOS_WANTNO_EMPTY:
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tns->tnsm.myOpt[opt].state = TNOS_WANTNO_OPPOSITE;
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break;
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case TNOS_WANTNO_OPPOSITE:
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break;
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case TNOS_WANTYES_EMPTY:
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tns->tnsm.myOpt[opt].state = TNOS_YES;
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break;
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case TNOS_WANTYES_OPPOSITE:
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tns->tnsm.myOpt[opt].state = TNOS_WANTYES_EMPTY;
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break;
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case TNOS_YES:
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break;
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}
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}
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}
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/*-----------------------------------------------------------------------------------*/
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/*
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* Implementation of option negotiation using the Q-method
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*/
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/*-----------------------------------------------------------------------------------*/
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static void
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HandleCommand(struct telnet_state* tns, unsigned char cmd, unsigned char opt)
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{
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if (opt < TNSM_MAX_OPTIONS) {
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/* Handling according to RFC 1143 "Q Method" */
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switch(cmd) {
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case TN_WILL:
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switch(tns->tnsm.hisOpt[opt].state) {
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case TNOS_NO:
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if (tns->tnsm.hisOpt[opt].wants) {
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tns->tnsm.hisOpt[opt].state = TNOS_YES;
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Reply(tns, TN_DO, opt);
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}
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else {
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Reply(tns, TN_DONT, opt);
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}
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break;
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case TNOS_WANTNO_EMPTY:
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tns->tnsm.hisOpt[opt].state = TNOS_NO;
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break;
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case TNOS_WANTNO_OPPOSITE:
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tns->tnsm.hisOpt[opt].state = TNOS_YES;
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break;
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case TNOS_WANTYES_EMPTY:
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tns->tnsm.hisOpt[opt].state = TNOS_YES;
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break;
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case TNOS_WANTYES_OPPOSITE:
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tns->tnsm.hisOpt[opt].state = TNOS_WANTNO_EMPTY;
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Reply(tns, TN_DONT, opt);
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break;
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case TNOS_YES:
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break;
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}
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break;
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case TN_WONT:
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switch(tns->tnsm.hisOpt[opt].state) {
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case TNOS_NO:
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break;
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case TNOS_WANTNO_EMPTY:
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case TNOS_WANTYES_EMPTY:
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case TNOS_WANTYES_OPPOSITE:
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tns->tnsm.hisOpt[opt].state = TNOS_NO;
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break;
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case TNOS_WANTNO_OPPOSITE:
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tns->tnsm.hisOpt[opt].state = TNOS_WANTYES_EMPTY;
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Reply(tns, TN_DO, opt);
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break;
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case TNOS_YES:
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tns->tnsm.hisOpt[opt].state = TNOS_NO;
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Reply(tns, TN_DONT, opt);
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break;
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}
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break;
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case TN_DO:
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switch(tns->tnsm.myOpt[opt].state) {
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case TNOS_NO:
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if (tns->tnsm.myOpt[opt].wants) {
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tns->tnsm.myOpt[opt].state = TNOS_YES;
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Reply(tns, TN_WILL, opt);
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}
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else {
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Reply(tns, TN_WONT, opt);
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}
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break;
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case TNOS_WANTNO_EMPTY:
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tns->tnsm.myOpt[opt].state = TNOS_NO;
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break;
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case TNOS_WANTNO_OPPOSITE:
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tns->tnsm.myOpt[opt].state = TNOS_YES;
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break;
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case TNOS_WANTYES_EMPTY:
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tns->tnsm.myOpt[opt].state = TNOS_YES;
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break;
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case TNOS_WANTYES_OPPOSITE:
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tns->tnsm.myOpt[opt].state = TNOS_WANTNO_EMPTY;
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Reply(tns, TN_WONT, opt);
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break;
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case TNOS_YES:
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break;
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}
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break;
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case TN_DONT:
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switch(tns->tnsm.myOpt[opt].state) {
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case TNOS_NO:
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break;
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case TNOS_WANTNO_EMPTY:
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case TNOS_WANTYES_EMPTY:
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case TNOS_WANTYES_OPPOSITE:
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tns->tnsm.myOpt[opt].state = TNOS_NO;
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break;
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case TNOS_WANTNO_OPPOSITE:
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tns->tnsm.myOpt[opt].state = TNOS_WANTYES_EMPTY;
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Reply(tns, TN_WILL, opt);
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break;
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case TNOS_YES:
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tns->tnsm.myOpt[opt].state = TNOS_NO;
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Reply(tns, TN_WONT, opt);
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break;
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}
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break;
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}
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}
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else {
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switch(cmd) {
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case TN_WILL:
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Reply(tns, TN_DONT, opt);
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break;
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case TN_WONT:
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break;
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case TN_DO:
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Reply(tns, TN_WONT, opt);
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break;
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case TN_DONT:
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break;
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}
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}
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}
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/*-----------------------------------------------------------------------------------*/
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/*
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* Telnet data parsing
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*/
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/*-----------------------------------------------------------------------------------*/
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static unsigned char
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parse_input(struct telnet_state* tns, unsigned char b)
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{
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unsigned char ret = 0;
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switch(tns->tnsm.state) {
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case TNS_IDLE:
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if (b == TN_IAC) tns->tnsm.state = TNS_IAC;
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else ret = 1;
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break;
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case TNS_IAC:
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switch(b) {
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case TN_SE:
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case TN_NOP:
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case TN_DM:
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case TN_BRK:
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case TN_IP:
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case TN_AO:
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case TN_AYT:
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case TN_EC:
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case TN_EL:
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case TN_GA:
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tns->tnsm.state = TNS_IDLE;
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break;
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case TN_SB:
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tns->tnsm.state = TNS_SB;
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break;
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case TN_WILL:
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case TN_WONT:
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case TN_DO:
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case TN_DONT:
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tns->tnsm.cmd = b;
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tns->tnsm.state = TNS_OPT;
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break;
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case TN_IAC:
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tns->tnsm.state = TNS_IDLE;
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ret = 1;
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break;
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default:
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/* Drop unknown IACs */
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tns->tnsm.state = TNS_IDLE;
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break;
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}
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break;
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case TNS_OPT:
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HandleCommand(tns, tns->tnsm.cmd, b);
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tns->tnsm.state = TNS_IDLE;
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break;
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case TNS_SB:
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if (b == TN_IAC) {
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tns->tnsm.state = TNS_SBIAC;
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}
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break;
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case TNS_SBIAC:
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if (b == TN_IAC) {
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tns->tnsm.state = TNS_SB;
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}
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else if (b == TN_SE) {
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tns->tnsm.state = TNS_IDLE;
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}
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else {
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tns->tnsm.state = TNS_IDLE;
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}
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break;
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}
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return ret;
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}
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/*-----------------------------------------------------------------------------------*/
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/*
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* Initialize telnet machine
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*/
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/*-----------------------------------------------------------------------------------*/
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static void
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telnet_init(struct telnet_state* tns)
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{
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int i;
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for (i = 0; i < TNSM_MAX_OPTIONS; i++) {
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tns->tnsm.myOpt[i].state = TNOS_NO;
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tns->tnsm.myOpt[i].wants = 0;
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tns->tnsm.hisOpt[i].state = TNOS_NO;
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tns->tnsm.hisOpt[i].wants = 0;
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}
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tns->tnsm.state = TNS_IDLE;
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}
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/*-----------------------------------------------------------------------------------*/
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/*
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* Allocate a telnet session structure (including terminal state)
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*/
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/*-----------------------------------------------------------------------------------*/
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static struct telnet_state*
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alloc_state()
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{
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for (i=0; i < NUM_CONNS; i++) {
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if (states[i].state == TTS_FREE) {
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states[i].termstate = ctk_term_alloc_state();
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if (states[i].termstate != NULL) {
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for (j = 0; j < TNQLEN; j++) {
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states[i].sendq[j] = 0;
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}
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telnet_init(&states[i]);
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states[i].state = TTS_IDLE;
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return &(states[i]);
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}
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}
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}
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return NULL;
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}
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/*-----------------------------------------------------------------------------------*/
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/*
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* Free a telnet session structure (including terminal state)
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*/
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/*-----------------------------------------------------------------------------------*/
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static void
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free_state(struct telnet_state* tns)
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{
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if (tns != NULL) {
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ctk_term_dealloc_state(tns->termstate);
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tns->state = TTS_FREE;
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}
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}
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/*-----------------------------------------------------------------------------------*/
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/*
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* A packet is successfully sent
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*/
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/*-----------------------------------------------------------------------------------*/
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static void
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acked(struct telnet_state* tns)
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{
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/* Were we sending a telnet option packet? */
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if (tns->state == TTS_SEND_TNDATA) {
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/* Yes, free it and update queue */
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if (tns->sendq[0] != 0) {
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memb_free(&telnetbuf, (char*)(tns->sendq[0]));
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for (i=1; i < TNQLEN; i++) {
|
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tns->sendq[i-1] = tns->sendq[i];
|
|
}
|
|
tns->sendq[TNQLEN-1] = 0;
|
|
/* No options left. Go idle */
|
|
if (tns->sendq[0] == 0) {
|
|
tns->state = TTS_IDLE;
|
|
}
|
|
}
|
|
}
|
|
/* Or were we sending application date ? */
|
|
else if (tns->state == TTS_SEND_APPDATA) {
|
|
/* Inform application that data is sent successfully */
|
|
ctk_term_sent(tns->termstate);
|
|
tns->state = TTS_IDLE;
|
|
}
|
|
}
|
|
|
|
/*-----------------------------------------------------------------------------------*/
|
|
/*
|
|
* Send data on a connections
|
|
*/
|
|
/*-----------------------------------------------------------------------------------*/
|
|
static void
|
|
senddata(struct telnet_state* tns)
|
|
{
|
|
/* Check if there are any option packets to send */
|
|
if (tns->state == TTS_IDLE || tns->state == TTS_SEND_TNDATA) {
|
|
if (tns->sendq[0] != 0) {
|
|
tns->state = TTS_SEND_TNDATA;
|
|
uip_send(tns->sendq[0],3);
|
|
}
|
|
}
|
|
/* Check if terminal wants to send any data */
|
|
if (tns->state == TTS_IDLE || tns->state == TTS_SEND_APPDATA) {
|
|
u16_t len = ctk_term_send(tns->termstate, (unsigned char*)uip_appdata, (unsigned short)uip_mss());
|
|
if (len > 0) {
|
|
tns->state = TTS_SEND_APPDATA;
|
|
uip_send(uip_appdata, len);
|
|
}
|
|
}
|
|
}
|
|
|
|
/*-----------------------------------------------------------------------------------*/
|
|
/*
|
|
* uIP callback
|
|
*/
|
|
/*-----------------------------------------------------------------------------------*/
|
|
static void
|
|
ctk_termtelnet_appcall(void *state)
|
|
{
|
|
struct telnet_state *tns;
|
|
|
|
tns = (struct telnet_state*)(state);
|
|
|
|
if(uip_connected()) {
|
|
if(tns == NULL) {
|
|
tns = alloc_state();
|
|
if(tns == NULL) {
|
|
uip_close();
|
|
return;
|
|
}
|
|
tcp_markconn(uip_conn, (void *)tns);
|
|
}
|
|
/* Try to negotiate some options */
|
|
EnableHisOpt(tns, TNO_SGA);
|
|
EnableMyOpt(tns,TNO_SGA);
|
|
EnableMyOpt(tns,TNO_ECHO);
|
|
/* Request update of screen */
|
|
ctk_term_redraw(tns->termstate);
|
|
senddata(tns);
|
|
} else if(uip_closed() || uip_aborted()) {
|
|
free_state(tns);
|
|
return;
|
|
}
|
|
|
|
if (uip_acked()) {
|
|
acked(tns);
|
|
}
|
|
|
|
if (uip_newdata()) {
|
|
for(j = 0; j < uip_datalen(); j++) {
|
|
if (parse_input(tns, uip_appdata[j])) {
|
|
/* Pass it uppwards */
|
|
ctk_term_input(tns->termstate, uip_appdata[j]);
|
|
}
|
|
}
|
|
}
|
|
|
|
if(uip_rexmit() ||
|
|
uip_newdata() ||
|
|
uip_acked()) {
|
|
senddata(tns);
|
|
} else if(uip_poll()) {
|
|
if (tns->state == TTS_IDLE) {
|
|
senddata(tns);
|
|
}
|
|
}
|
|
}
|
|
/*-----------------------------------------------------------------------------------*/
|
|
/*
|
|
* Init function
|
|
*/
|
|
/*-----------------------------------------------------------------------------------*/
|
|
LOADER_INIT_FUNC(ctk_termtelnet_init, arg)
|
|
{
|
|
arg_free(arg);
|
|
if(id == EK_ID_NONE) {
|
|
memb_init(&telnetbuf);
|
|
for (i=0; i < NUM_CONNS; i++) {
|
|
states[i].state = TTS_FREE;
|
|
}
|
|
id = ek_start(&p);
|
|
}
|
|
}
|
|
/*-----------------------------------------------------------------------------------*/
|
|
EK_EVENTHANDLER(eventhandler, ev, data)
|
|
{
|
|
if(ev == EK_EVENT_INIT) {
|
|
tcp_listen(HTONS(PORT));
|
|
} else if(ev == tcpip_event) {
|
|
ctk_termtelnet_appcall(data);
|
|
}
|
|
}
|