1 | /* vi: set sw=4 ts=4: */
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2 | /*
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3 | * telnet implementation for busybox
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4 | *
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5 | * Author: Tomi Ollila <too@iki.fi>
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6 | * Copyright (C) 1994-2000 by Tomi Ollila
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7 | *
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8 | * Created: Thu Apr 7 13:29:41 1994 too
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9 | * Last modified: Fri Jun 9 14:34:24 2000 too
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10 | *
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11 | * Licensed under the GPL v2 or later, see the file LICENSE in this tarball.
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12 | *
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13 | * HISTORY
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14 | * Revision 3.1 1994/04/17 11:31:54 too
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15 | * initial revision
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16 | * Modified 2000/06/13 for inclusion into BusyBox by Erik Andersen <andersen@codepoet.org>
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17 | * Modified 2001/05/07 to add ability to pass TTYPE to remote host by Jim McQuillan
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18 | * <jam@ltsp.org>
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19 | * Modified 2004/02/11 to add ability to pass the USER variable to remote host
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20 | * by Fernando Silveira <swrh@gmx.net>
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21 | *
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22 | */
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23 |
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24 | #include <termios.h>
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25 | #include <arpa/telnet.h>
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26 | #include <netinet/in.h>
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27 | #include "libbb.h"
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28 |
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29 | #ifdef DOTRACE
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30 | #define TRACE(x, y) do { if (x) printf y; } while (0)
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31 | #else
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32 | #define TRACE(x, y)
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33 | #endif
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34 |
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35 | enum {
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36 | DATABUFSIZE = 128,
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37 | IACBUFSIZE = 128,
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38 |
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39 | CHM_TRY = 0,
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40 | CHM_ON = 1,
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41 | CHM_OFF = 2,
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42 |
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43 | UF_ECHO = 0x01,
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44 | UF_SGA = 0x02,
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45 |
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46 | TS_0 = 1,
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47 | TS_IAC = 2,
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48 | TS_OPT = 3,
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49 | TS_SUB1 = 4,
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50 | TS_SUB2 = 5,
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51 | };
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52 |
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53 | typedef unsigned char byte;
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54 |
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55 | struct globals {
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56 | int netfd; /* console fd:s are 0 and 1 (and 2) */
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57 | short iaclen; /* could even use byte */
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58 | byte telstate; /* telnet negotiation state from network input */
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59 | byte telwish; /* DO, DONT, WILL, WONT */
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60 | byte charmode;
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61 | byte telflags;
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62 | byte gotsig;
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63 | byte do_termios;
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64 | #if ENABLE_FEATURE_TELNET_TTYPE
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65 | char *ttype;
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66 | #endif
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67 | #if ENABLE_FEATURE_TELNET_AUTOLOGIN
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68 | const char *autologin;
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69 | #endif
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70 | #if ENABLE_FEATURE_AUTOWIDTH
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71 | int win_width, win_height;
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72 | #endif
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73 | /* same buffer used both for network and console read/write */
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74 | char buf[DATABUFSIZE];
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75 | /* buffer to handle telnet negotiations */
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76 | char iacbuf[IACBUFSIZE];
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77 | struct termios termios_def;
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78 | struct termios termios_raw;
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79 | };
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80 | #define G (*(struct globals*)&bb_common_bufsiz1)
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81 | void BUG_telnet_globals_too_big(void);
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82 | #define INIT_G() do { \
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83 | if (sizeof(G) > COMMON_BUFSIZE) \
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84 | BUG_telnet_globals_too_big(); \
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85 | /* memset(&G, 0, sizeof G); - already is */ \
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86 | } while (0)
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87 |
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88 | /* Function prototypes */
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89 | static void rawmode(void);
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90 | static void cookmode(void);
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91 | static void do_linemode(void);
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92 | static void will_charmode(void);
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93 | static void telopt(byte c);
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94 | static int subneg(byte c);
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95 |
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96 | static void iacflush(void)
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97 | {
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98 | write(G.netfd, G.iacbuf, G.iaclen);
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99 | G.iaclen = 0;
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100 | }
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101 |
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102 | #define write_str(fd, str) write(fd, str, sizeof(str) - 1)
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103 |
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104 | static void doexit(int ev)
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105 | {
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106 | cookmode();
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107 | exit(ev);
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108 | }
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109 |
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110 | static void conescape(void)
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111 | {
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112 | char b;
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113 |
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114 | if (G.gotsig) /* came from line mode... go raw */
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115 | rawmode();
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116 |
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117 | write_str(1, "\r\nConsole escape. Commands are:\r\n\n"
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118 | " l go to line mode\r\n"
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119 | " c go to character mode\r\n"
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120 | " z suspend telnet\r\n"
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121 | " e exit telnet\r\n");
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122 |
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123 | if (read(0, &b, 1) <= 0)
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124 | doexit(1);
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125 |
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126 | switch (b) {
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127 | case 'l':
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128 | if (!G.gotsig) {
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129 | do_linemode();
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130 | goto rrturn;
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131 | }
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132 | break;
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133 | case 'c':
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134 | if (G.gotsig) {
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135 | will_charmode();
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136 | goto rrturn;
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137 | }
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138 | break;
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139 | case 'z':
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140 | cookmode();
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141 | kill(0, SIGTSTP);
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142 | rawmode();
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143 | break;
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144 | case 'e':
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145 | doexit(0);
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146 | }
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147 |
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148 | write_str(1, "continuing...\r\n");
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149 |
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150 | if (G.gotsig)
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151 | cookmode();
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152 |
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153 | rrturn:
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154 | G.gotsig = 0;
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155 |
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156 | }
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157 |
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158 | static void handlenetoutput(int len)
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159 | {
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160 | /* here we could do smart tricks how to handle 0xFF:s in output
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161 | * stream like writing twice every sequence of FF:s (thus doing
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162 | * many write()s. But I think interactive telnet application does
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163 | * not need to be 100% 8-bit clean, so changing every 0xff:s to
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164 | * 0x7f:s
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165 | *
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166 | * 2002-mar-21, Przemyslaw Czerpak (druzus@polbox.com)
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167 | * I don't agree.
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168 | * first - I cannot use programs like sz/rz
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169 | * second - the 0x0D is sent as one character and if the next
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170 | * char is 0x0A then it's eaten by a server side.
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171 | * third - whay doy you have to make 'many write()s'?
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172 | * I don't understand.
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173 | * So I implemented it. It's realy useful for me. I hope that
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174 | * others people will find it interesting to.
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175 | */
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176 |
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177 | int i, j;
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178 | byte * p = (byte*)G.buf;
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179 | byte outbuf[4*DATABUFSIZE];
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180 |
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181 | for (i = len, j = 0; i > 0; i--, p++)
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182 | {
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183 | if (*p == 0x1d)
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184 | {
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185 | conescape();
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186 | return;
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187 | }
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188 | outbuf[j++] = *p;
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189 | if (*p == 0xff)
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190 | outbuf[j++] = 0xff;
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191 | else if (*p == 0x0d)
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192 | outbuf[j++] = 0x00;
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193 | }
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194 | if (j > 0)
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195 | write(G.netfd, outbuf, j);
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196 | }
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197 |
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198 | static void handlenetinput(int len)
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199 | {
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200 | int i;
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201 | int cstart = 0;
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202 |
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203 | for (i = 0; i < len; i++)
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204 | {
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205 | byte c = G.buf[i];
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206 |
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207 | if (G.telstate == 0) /* most of the time state == 0 */
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208 | {
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209 | if (c == IAC)
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210 | {
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211 | cstart = i;
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212 | G.telstate = TS_IAC;
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213 | }
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214 | }
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215 | else
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216 | switch (G.telstate)
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217 | {
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218 | case TS_0:
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219 | if (c == IAC)
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220 | G.telstate = TS_IAC;
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221 | else
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222 | G.buf[cstart++] = c;
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223 | break;
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224 |
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225 | case TS_IAC:
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226 | if (c == IAC) /* IAC IAC -> 0xFF */
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227 | {
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228 | G.buf[cstart++] = c;
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229 | G.telstate = TS_0;
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230 | break;
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231 | }
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232 | /* else */
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233 | switch (c)
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234 | {
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235 | case SB:
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236 | G.telstate = TS_SUB1;
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237 | break;
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238 | case DO:
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239 | case DONT:
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240 | case WILL:
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241 | case WONT:
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242 | G.telwish = c;
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243 | G.telstate = TS_OPT;
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244 | break;
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245 | default:
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246 | G.telstate = TS_0; /* DATA MARK must be added later */
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247 | }
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248 | break;
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249 | case TS_OPT: /* WILL, WONT, DO, DONT */
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250 | telopt(c);
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251 | G.telstate = TS_0;
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252 | break;
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253 | case TS_SUB1: /* Subnegotiation */
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254 | case TS_SUB2: /* Subnegotiation */
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255 | if (subneg(c))
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256 | G.telstate = TS_0;
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257 | break;
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258 | }
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259 | }
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260 | if (G.telstate)
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261 | {
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262 | if (G.iaclen) iacflush();
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263 | if (G.telstate == TS_0) G.telstate = 0;
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264 |
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265 | len = cstart;
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266 | }
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267 |
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268 | if (len)
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269 | write(1, G.buf, len);
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270 | }
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271 |
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272 | static void putiac(int c)
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273 | {
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274 | G.iacbuf[G.iaclen++] = c;
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275 | }
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276 |
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277 | static void putiac2(byte wwdd, byte c)
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278 | {
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279 | if (G.iaclen + 3 > IACBUFSIZE)
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280 | iacflush();
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281 |
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282 | putiac(IAC);
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283 | putiac(wwdd);
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284 | putiac(c);
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285 | }
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286 |
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287 | #if ENABLE_FEATURE_TELNET_TTYPE
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288 | static void putiac_subopt(byte c, char *str)
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289 | {
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290 | int len = strlen(str) + 6; // ( 2 + 1 + 1 + strlen + 2 )
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291 |
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292 | if (G.iaclen + len > IACBUFSIZE)
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293 | iacflush();
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294 |
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295 | putiac(IAC);
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296 | putiac(SB);
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297 | putiac(c);
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298 | putiac(0);
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299 |
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300 | while (*str)
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301 | putiac(*str++);
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302 |
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303 | putiac(IAC);
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304 | putiac(SE);
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305 | }
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306 | #endif
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307 |
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308 | #if ENABLE_FEATURE_TELNET_AUTOLOGIN
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309 | static void putiac_subopt_autologin(void)
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310 | {
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311 | int len = strlen(G.autologin) + 6; // (2 + 1 + 1 + strlen + 2)
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312 | const char *user = "USER";
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313 |
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314 | if (G.iaclen + len > IACBUFSIZE)
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315 | iacflush();
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316 |
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317 | putiac(IAC);
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318 | putiac(SB);
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319 | putiac(TELOPT_NEW_ENVIRON);
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320 | putiac(TELQUAL_IS);
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321 | putiac(NEW_ENV_VAR);
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322 |
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323 | while (*user)
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324 | putiac(*user++);
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325 |
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326 | putiac(NEW_ENV_VALUE);
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327 |
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328 | while (*G.autologin)
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329 | putiac(*G.autologin++);
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330 |
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331 | putiac(IAC);
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332 | putiac(SE);
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333 | }
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334 | #endif
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335 |
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336 | #if ENABLE_FEATURE_AUTOWIDTH
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337 | static void putiac_naws(byte c, int x, int y)
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338 | {
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339 | if (G.iaclen + 9 > IACBUFSIZE)
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340 | iacflush();
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341 |
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342 | putiac(IAC);
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343 | putiac(SB);
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344 | putiac(c);
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345 |
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346 | putiac((x >> 8) & 0xff);
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347 | putiac(x & 0xff);
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348 | putiac((y >> 8) & 0xff);
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349 | putiac(y & 0xff);
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350 |
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351 | putiac(IAC);
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352 | putiac(SE);
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353 | }
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354 | #endif
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355 |
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356 | static char const escapecharis[] ALIGN1 = "\r\nEscape character is ";
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357 |
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358 | static void setConMode(void)
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359 | {
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360 | if (G.telflags & UF_ECHO) {
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361 | if (G.charmode == CHM_TRY) {
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362 | G.charmode = CHM_ON;
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363 | printf("\r\nEntering character mode%s'^]'.\r\n", escapecharis);
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364 | rawmode();
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365 | }
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366 | } else {
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367 | if (G.charmode != CHM_OFF) {
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368 | G.charmode = CHM_OFF;
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369 | printf("\r\nEntering line mode%s'^C'.\r\n", escapecharis);
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370 | cookmode();
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371 | }
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372 | }
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373 | }
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374 |
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375 | static void will_charmode(void)
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376 | {
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377 | G.charmode = CHM_TRY;
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378 | G.telflags |= (UF_ECHO | UF_SGA);
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379 | setConMode();
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380 |
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381 | putiac2(DO, TELOPT_ECHO);
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382 | putiac2(DO, TELOPT_SGA);
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383 | iacflush();
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384 | }
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385 |
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386 | static void do_linemode(void)
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387 | {
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388 | G.charmode = CHM_TRY;
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389 | G.telflags &= ~(UF_ECHO | UF_SGA);
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390 | setConMode();
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391 |
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392 | putiac2(DONT, TELOPT_ECHO);
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393 | putiac2(DONT, TELOPT_SGA);
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394 | iacflush();
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395 | }
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396 |
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397 | static void to_notsup(char c)
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398 | {
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399 | if (G.telwish == WILL)
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400 | putiac2(DONT, c);
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401 | else if (G.telwish == DO)
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402 | putiac2(WONT, c);
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403 | }
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404 |
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405 | static void to_echo(void)
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406 | {
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407 | /* if server requests ECHO, don't agree */
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408 | if (G.telwish == DO) {
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409 | putiac2(WONT, TELOPT_ECHO);
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410 | return;
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411 | }
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412 | if (G.telwish == DONT)
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413 | return;
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414 |
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415 | if (G.telflags & UF_ECHO) {
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416 | if (G.telwish == WILL)
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417 | return;
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418 | } else if (G.telwish == WONT)
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419 | return;
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420 |
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421 | if (G.charmode != CHM_OFF)
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422 | G.telflags ^= UF_ECHO;
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423 |
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424 | if (G.telflags & UF_ECHO)
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425 | putiac2(DO, TELOPT_ECHO);
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426 | else
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427 | putiac2(DONT, TELOPT_ECHO);
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428 |
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429 | setConMode();
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430 | write_str(1, "\r\n"); /* sudden modec */
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431 | }
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432 |
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433 | static void to_sga(void)
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434 | {
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435 | /* daemon always sends will/wont, client do/dont */
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436 |
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437 | if (G.telflags & UF_SGA) {
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438 | if (G.telwish == WILL)
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439 | return;
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440 | } else if (G.telwish == WONT)
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441 | return;
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442 |
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443 | if ((G.telflags ^= UF_SGA) & UF_SGA) /* toggle */
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444 | putiac2(DO, TELOPT_SGA);
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445 | else
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446 | putiac2(DONT, TELOPT_SGA);
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447 | }
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448 |
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449 | #if ENABLE_FEATURE_TELNET_TTYPE
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450 | static void to_ttype(void)
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451 | {
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452 | /* Tell server we will (or won't) do TTYPE */
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453 |
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454 | if (G.ttype)
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455 | putiac2(WILL, TELOPT_TTYPE);
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456 | else
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457 | putiac2(WONT, TELOPT_TTYPE);
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458 | }
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459 | #endif
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460 |
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461 | #if ENABLE_FEATURE_TELNET_AUTOLOGIN
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462 | static void to_new_environ(void)
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463 | {
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464 | /* Tell server we will (or will not) do AUTOLOGIN */
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465 |
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466 | if (G.autologin)
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467 | putiac2(WILL, TELOPT_NEW_ENVIRON);
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468 | else
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469 | putiac2(WONT, TELOPT_NEW_ENVIRON);
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470 | }
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471 | #endif
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472 |
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473 | #if ENABLE_FEATURE_AUTOWIDTH
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474 | static void to_naws(void)
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475 | {
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476 | /* Tell server we will do NAWS */
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477 | putiac2(WILL, TELOPT_NAWS);
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478 | }
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479 | #endif
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480 |
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481 | static void telopt(byte c)
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482 | {
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483 | switch (c) {
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484 | case TELOPT_ECHO:
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485 | to_echo(); break;
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486 | case TELOPT_SGA:
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487 | to_sga(); break;
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488 | #if ENABLE_FEATURE_TELNET_TTYPE
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489 | case TELOPT_TTYPE:
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490 | to_ttype(); break;
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491 | #endif
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492 | #if ENABLE_FEATURE_TELNET_AUTOLOGIN
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493 | case TELOPT_NEW_ENVIRON:
|
---|
494 | to_new_environ(); break;
|
---|
495 | #endif
|
---|
496 | #if ENABLE_FEATURE_AUTOWIDTH
|
---|
497 | case TELOPT_NAWS:
|
---|
498 | to_naws();
|
---|
499 | putiac_naws(c, G.win_width, G.win_height);
|
---|
500 | break;
|
---|
501 | #endif
|
---|
502 | default:
|
---|
503 | to_notsup(c);
|
---|
504 | break;
|
---|
505 | }
|
---|
506 | }
|
---|
507 |
|
---|
508 | /* subnegotiation -- ignore all (except TTYPE,NAWS) */
|
---|
509 | static int subneg(byte c)
|
---|
510 | {
|
---|
511 | switch (G.telstate) {
|
---|
512 | case TS_SUB1:
|
---|
513 | if (c == IAC)
|
---|
514 | G.telstate = TS_SUB2;
|
---|
515 | #if ENABLE_FEATURE_TELNET_TTYPE
|
---|
516 | else
|
---|
517 | if (c == TELOPT_TTYPE)
|
---|
518 | putiac_subopt(TELOPT_TTYPE, G.ttype);
|
---|
519 | #endif
|
---|
520 | #if ENABLE_FEATURE_TELNET_AUTOLOGIN
|
---|
521 | else
|
---|
522 | if (c == TELOPT_NEW_ENVIRON)
|
---|
523 | putiac_subopt_autologin();
|
---|
524 | #endif
|
---|
525 | break;
|
---|
526 | case TS_SUB2:
|
---|
527 | if (c == SE)
|
---|
528 | return TRUE;
|
---|
529 | G.telstate = TS_SUB1;
|
---|
530 | /* break; */
|
---|
531 | }
|
---|
532 | return FALSE;
|
---|
533 | }
|
---|
534 |
|
---|
535 | static void fgotsig(int sig)
|
---|
536 | {
|
---|
537 | G.gotsig = sig;
|
---|
538 | }
|
---|
539 |
|
---|
540 |
|
---|
541 | static void rawmode(void)
|
---|
542 | {
|
---|
543 | if (G.do_termios)
|
---|
544 | tcsetattr(0, TCSADRAIN, &G.termios_raw);
|
---|
545 | }
|
---|
546 |
|
---|
547 | static void cookmode(void)
|
---|
548 | {
|
---|
549 | if (G.do_termios)
|
---|
550 | tcsetattr(0, TCSADRAIN, &G.termios_def);
|
---|
551 | }
|
---|
552 |
|
---|
553 | int telnet_main(int argc, char** argv);
|
---|
554 | int telnet_main(int argc, char** argv)
|
---|
555 | {
|
---|
556 | char *host;
|
---|
557 | int port;
|
---|
558 | int len;
|
---|
559 | #ifdef USE_POLL
|
---|
560 | struct pollfd ufds[2];
|
---|
561 | #else
|
---|
562 | fd_set readfds;
|
---|
563 | int maxfd;
|
---|
564 | #endif
|
---|
565 |
|
---|
566 | INIT_G();
|
---|
567 |
|
---|
568 | #if ENABLE_FEATURE_AUTOWIDTH
|
---|
569 | get_terminal_width_height(0, &G.win_width, &G.win_height);
|
---|
570 | #endif
|
---|
571 |
|
---|
572 | #if ENABLE_FEATURE_TELNET_TTYPE
|
---|
573 | G.ttype = getenv("TERM");
|
---|
574 | #endif
|
---|
575 |
|
---|
576 | if (tcgetattr(0, &G.termios_def) >= 0) {
|
---|
577 | G.do_termios = 1;
|
---|
578 | G.termios_raw = G.termios_def;
|
---|
579 | cfmakeraw(&G.termios_raw);
|
---|
580 | }
|
---|
581 |
|
---|
582 | if (argc < 2)
|
---|
583 | bb_show_usage();
|
---|
584 |
|
---|
585 | #if ENABLE_FEATURE_TELNET_AUTOLOGIN
|
---|
586 | if (1 & getopt32(argv, "al:", &G.autologin))
|
---|
587 | G.autologin = getenv("USER");
|
---|
588 | argv += optind;
|
---|
589 | #else
|
---|
590 | argv++;
|
---|
591 | #endif
|
---|
592 | if (!*argv)
|
---|
593 | bb_show_usage();
|
---|
594 | host = *argv++;
|
---|
595 | port = bb_lookup_port(*argv ? *argv++ : "telnet", "tcp", 23);
|
---|
596 | if (*argv) /* extra params?? */
|
---|
597 | bb_show_usage();
|
---|
598 |
|
---|
599 | G.netfd = create_and_connect_stream_or_die(host, port);
|
---|
600 |
|
---|
601 | setsockopt(G.netfd, SOL_SOCKET, SO_KEEPALIVE, &const_int_1, sizeof(const_int_1));
|
---|
602 |
|
---|
603 | signal(SIGINT, fgotsig);
|
---|
604 |
|
---|
605 | #ifdef USE_POLL
|
---|
606 | ufds[0].fd = 0; ufds[1].fd = G.netfd;
|
---|
607 | ufds[0].events = ufds[1].events = POLLIN;
|
---|
608 | #else
|
---|
609 | FD_ZERO(&readfds);
|
---|
610 | FD_SET(0, &readfds);
|
---|
611 | FD_SET(G.netfd, &readfds);
|
---|
612 | maxfd = G.netfd + 1;
|
---|
613 | #endif
|
---|
614 |
|
---|
615 | while (1) {
|
---|
616 | #ifndef USE_POLL
|
---|
617 | fd_set rfds = readfds;
|
---|
618 |
|
---|
619 | switch (select(maxfd, &rfds, NULL, NULL, NULL))
|
---|
620 | #else
|
---|
621 | switch (poll(ufds, 2, -1))
|
---|
622 | #endif
|
---|
623 | {
|
---|
624 | case 0:
|
---|
625 | /* timeout */
|
---|
626 | case -1:
|
---|
627 | /* error, ignore and/or log something, bay go to loop */
|
---|
628 | if (G.gotsig)
|
---|
629 | conescape();
|
---|
630 | else
|
---|
631 | sleep(1);
|
---|
632 | break;
|
---|
633 | default:
|
---|
634 |
|
---|
635 | #ifdef USE_POLL
|
---|
636 | if (ufds[0].revents) /* well, should check POLLIN, but ... */
|
---|
637 | #else
|
---|
638 | if (FD_ISSET(0, &rfds))
|
---|
639 | #endif
|
---|
640 | {
|
---|
641 | len = read(0, G.buf, DATABUFSIZE);
|
---|
642 | if (len <= 0)
|
---|
643 | doexit(0);
|
---|
644 | TRACE(0, ("Read con: %d\n", len));
|
---|
645 | handlenetoutput(len);
|
---|
646 | }
|
---|
647 |
|
---|
648 | #ifdef USE_POLL
|
---|
649 | if (ufds[1].revents) /* well, should check POLLIN, but ... */
|
---|
650 | #else
|
---|
651 | if (FD_ISSET(G.netfd, &rfds))
|
---|
652 | #endif
|
---|
653 | {
|
---|
654 | len = read(G.netfd, G.buf, DATABUFSIZE);
|
---|
655 | if (len <= 0) {
|
---|
656 | write_str(1, "Connection closed by foreign host\r\n");
|
---|
657 | doexit(1);
|
---|
658 | }
|
---|
659 | TRACE(0, ("Read netfd (%d): %d\n", G.netfd, len));
|
---|
660 | handlenetinput(len);
|
---|
661 | }
|
---|
662 | }
|
---|
663 | }
|
---|
664 | }
|
---|