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csantifort |
/*----------------------------------------------------------------
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// //
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// boot-loader-ethmac.c //
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// //
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// This file is part of the Amber project //
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// http://www.opencores.org/project,amber //
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// //
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// Description //
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// The main functions for the boot loader application. This //
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// application is embedded in the FPGA's SRAM and is used //
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// to load larger applications into the DDR3 memory on //
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// the development board. //
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// //
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// Author(s): //
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// - Conor Santifort, csantifort.amber@gmail.com //
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// //
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//////////////////////////////////////////////////////////////////
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// //
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// Copyright (C) 2011 Authors and OPENCORES.ORG //
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// //
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// This source file may be used and distributed without //
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// restriction provided that this copyright statement is not //
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// removed from the file and that any derivative work contains //
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// the original copyright notice and the associated disclaimer. //
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// //
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// This source file is free software; you can redistribute it //
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// and/or modify it under the terms of the GNU Lesser General //
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// Public License as published by the Free Software Foundation; //
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// either version 2.1 of the License, or (at your option) any //
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// later version. //
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// //
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// This source is distributed in the hope that it will be //
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// useful, but WITHOUT ANY WARRANTY; without even the implied //
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// warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR //
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// PURPOSE. See the GNU Lesser General Public License for more //
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// details. //
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// //
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// You should have received a copy of the GNU Lesser General //
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// Public License along with this source; if not, download it //
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// from http://www.opencores.org/lgpl.shtml //
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// //
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----------------------------------------------------------------*/
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#include "timer.h"
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#include "line-buffer.h"
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#include "packet.h"
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#include "tcp.h"
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#include "telnet.h"
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void parse_telnet_options(char* buf, socket_t* socket)
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{
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int i;
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int stage = 0;
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char stage1;
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for (i=0;i<socket->rx_packet->tcp_payload_len;i++) {
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if (stage == 0) {
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switch (buf[i]) {
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case 241: stage = 0; break; // NOP
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case 255: stage = 1;
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if (socket->telnet_connection_state == TELNET_CLOSED) {
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socket->telnet_connection_state = TELNET_OPEN;
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}
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break; // IAC
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default: if (buf[i] < 128)
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goto telnet_payload;
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}
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} else if (stage == 1) {
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stage1 = buf[i];
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switch (buf[i]) {
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case 241 : stage = 0; break; // NOP
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case 250 : stage = 2; break; // SB
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case TELNET_WILL: stage = 2; break; // 0xfb WILL
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case TELNET_WONT: stage = 2; break; // 0xfc WONT
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case TELNET_DO : stage = 2; break; // 0xfd DO
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case TELNET_DONT: stage = 2; break; // 0xfe DONT
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default : stage = 2; break;
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}
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} else { // stage = 2
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stage = 0;
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switch (buf[i]) {
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case 1: // echo
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/* Client request that server echos stuff back to client */
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if (stage1 == TELNET_DO)
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socket->telnet_echo_mode = 1;
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/* Client request that server does not echo stuff back to client */
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else if (stage1 == TELNET_DONT)
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socket->telnet_echo_mode = 0;
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break;
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case 3: break; // suppress go ahead
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case 5: break; // status
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case 6: break; // time mark
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case 24: break; // terminal type
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case 31: break; // window size
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case 32: break; // terminal speed
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case 33: break; // remote flow control
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case 34: break; // linemode
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case 35: break; // X display location
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case 39: break; // New environmental variable option
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default: break;
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}
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}
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}
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return;
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telnet_payload:
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socket->rx_packet->telnet_payload_len = socket->rx_packet->tcp_payload_len - i;
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parse_telnet_payload(&buf[i], socket);
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}
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void parse_telnet_payload(char * buf, socket_t* socket)
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{
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int i;
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int cr = 0;
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int windows = 0;
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for (i=0;i<socket->rx_packet->telnet_payload_len;i++) {
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if (buf[i] == '\n')
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windows = 1;
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else if (buf[i] < 128 && buf[i] != 0) {
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/* end of a line */
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/* receive \r\n from Windows, \r from Linux */
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if (buf[i] == '\r') {
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cr=1;
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put_byte(socket->telnet_rxbuf, buf[i], 1); /* last byte of line */
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}
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else {
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put_byte(socket->telnet_rxbuf, buf[i], 0); /* not last byte of line */
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}
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}
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}
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if (socket->telnet_echo_mode) {
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if (cr && !windows) {
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buf[socket->rx_packet->telnet_payload_len] = '\n';
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socket->rx_packet->telnet_payload_len++;
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}
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tcp_reply(socket, buf, socket->rx_packet->telnet_payload_len);
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}
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}
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void telnet_options(socket_t* socket)
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{
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char buf[3];
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// telnet options
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// Will echo - advertise that I have the ability to echo back commands to the client
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buf[0] = 0xff; buf[1] = TELNET_WILL; buf[2] = 0x01;
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tcp_reply(socket, buf, 3);
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}
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void telnet_tx(socket_t* socket, line_buf_t* txbuf)
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{
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int line_len;
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int total_line_len;
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char* line;
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char* first_line;
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/* Parse telnet tx buffer
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Grab as many lines as possible to stuff into a packet to transmit */
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line_len = get_line(txbuf, &first_line);
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if (line_len) {
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total_line_len = line_len;
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while (total_line_len < MAX_TELNET_TX && line_len) {
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line_len = get_line(txbuf, &line);
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total_line_len += line_len;
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}
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tcp_tx(socket, first_line, total_line_len);
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}
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}
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/*
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void telnet_broadcast (const char *fmt, ...)
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{
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register unsigned long *varg = (unsigned long *)(&fmt);
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*varg++;
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put_line (socket0_g->telnet_txbuf, fmt, varg);
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put_line (socket1_g->telnet_txbuf, fmt, varg);
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}
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*/
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