1 | /* vi: set sw=4 ts=4: */
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2 | /*
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3 | * A text-mode VNC like program for Linux virtual terminals.
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4 | *
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5 | * pascal.bellard@ads-lu.com
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6 | *
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7 | * Based on Russell Stuart's conspy.c
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8 | * http://ace-host.stuart.id.au/russell/files/conspy.c
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9 | *
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10 | * Licensed under GPLv2 or later, see file LICENSE in this source tree.
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11 | */
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12 |
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13 | //applet:IF_CONSPY(APPLET(conspy, _BB_DIR_BIN, _BB_SUID_DROP))
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14 |
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15 | //kbuild:lib-$(CONFIG_CONSPY) += conspy.o
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16 |
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17 | //config:config CONSPY
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18 | //config: bool "conspy"
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19 | //config: default n
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20 | //config: depends on PLATFORM_LINUX
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21 | //config: help
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22 | //config: A text-mode VNC like program for Linux virtual terminals.
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23 | //config: example: conspy NUM shared access to console num
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24 | //config: or conspy -nd NUM screenshot of console num
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25 | //config: or conspy -cs NUM poor man's GNU screen like
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26 |
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27 | //usage:#define conspy_trivial_usage
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28 | //usage: "[-vcsndf] [-x COL] [-y LINE] [CONSOLE_NO]"
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29 | //usage:#define conspy_full_usage "\n\n"
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30 | //usage: "A text-mode VNC like program for Linux virtual consoles."
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31 | //usage: "\nTo exit, quickly press ESC 3 times."
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32 | //usage: "\n"
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33 | //usage: "\nOptions:"
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34 | //usage: "\n -v Don't send keystrokes to the console"
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35 | //usage: "\n -c Create missing devices in /dev"
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36 | //usage: "\n -s Open a SHELL session"
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37 | //usage: "\n -n Black & white"
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38 | //usage: "\n -d Dump console to stdout"
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39 | //usage: "\n -f Follow cursor"
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40 | //usage: "\n -x COL Starting column"
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41 | //usage: "\n -y LINE Starting line"
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42 |
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43 | #include "libbb.h"
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44 | #include <sys/kd.h>
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45 |
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46 |
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47 | #define ESC "\033"
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48 |
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49 | struct screen_info {
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50 | unsigned char lines, cols, cursor_x, cursor_y;
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51 | };
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52 |
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53 | #define CHAR(x) (*(uint8_t*)(x))
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54 | #define ATTR(x) (((uint8_t*)(x))[1])
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55 | #define NEXT(x) ((x) += 2)
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56 | #define DATA(x) (*(uint16_t*)(x))
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57 |
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58 | struct globals {
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59 | char* data;
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60 | int size;
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61 | int x, y;
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62 | int kbd_fd;
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63 | int ioerror_count;
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64 | int key_count;
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65 | int escape_count;
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66 | int nokeys;
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67 | int current;
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68 | int first_line_offset;
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69 | int last_attr;
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70 | // cached local tty parameters
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71 | unsigned width;
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72 | unsigned height;
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73 | unsigned col;
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74 | unsigned line;
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75 | smallint curoff; // unknown:0 cursor on:-1 cursor off:1
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76 | char attrbuf[sizeof(ESC"[0;1;5;30;40m")];
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77 | // remote console
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78 | struct screen_info remote;
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79 | // saved local tty terminfo
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80 | struct termios term_orig;
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81 | char vcsa_name[sizeof("/dev/vcsaNN")];
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82 | };
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83 |
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84 | #define G (*ptr_to_globals)
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85 | #define INIT_G() do { \
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86 | SET_PTR_TO_GLOBALS(xzalloc(sizeof(G))); \
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87 | G.attrbuf[0] = '\033'; \
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88 | G.attrbuf[1] = '['; \
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89 | G.width = G.height = UINT_MAX; \
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90 | G.last_attr--; \
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91 | } while (0)
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92 |
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93 | enum {
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94 | FLAG_v, // view only
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95 | FLAG_c, // create device if need
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96 | FLAG_s, // session
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97 | FLAG_n, // no colors
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98 | FLAG_d, // dump screen
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99 | FLAG_f, // follow cursor
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100 | };
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101 | #define FLAG(x) (1 << FLAG_##x)
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102 | #define BW (option_mask32 & FLAG(n))
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103 |
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104 | static void clrscr(void)
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105 | {
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106 | // Home, clear till end of screen
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107 | fputs(ESC"[1;1H" ESC"[J", stdout);
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108 | G.col = G.line = 0;
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109 | }
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110 |
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111 | static void set_cursor(int state)
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112 | {
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113 | if (G.curoff != state) {
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114 | G.curoff = state;
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115 | fputs(ESC"[?25", stdout);
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116 | bb_putchar("h?l"[1 + state]);
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117 | }
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118 | }
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119 |
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120 | static void gotoxy(int col, int line)
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121 | {
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122 | if (G.col != col || G.line != line) {
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123 | G.col = col;
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124 | G.line = line;
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125 | printf(ESC"[%u;%uH", line + 1, col + 1);
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126 | }
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127 | }
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128 |
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129 | static void cleanup(int code)
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130 | {
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131 | set_cursor(-1); // cursor on
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132 | tcsetattr(G.kbd_fd, TCSANOW, &G.term_orig);
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133 | if (ENABLE_FEATURE_CLEAN_UP) {
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134 | close(G.kbd_fd);
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135 | }
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136 | // Reset attributes
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137 | if (!BW)
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138 | fputs(ESC"[0m", stdout);
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139 | bb_putchar('\n');
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140 | if (code > 1)
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141 | kill_myself_with_sig(code);
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142 | exit(code);
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143 | }
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144 |
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145 | static void screen_read_close(void)
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146 | {
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147 | unsigned i, j;
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148 | int vcsa_fd;
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149 | char *data;
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150 |
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151 | // Close & re-open vcsa in case they have swapped virtual consoles
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152 | vcsa_fd = xopen(G.vcsa_name, O_RDONLY);
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153 | xread(vcsa_fd, &G.remote, 4);
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154 | i = G.remote.cols * 2;
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155 | G.first_line_offset = G.y * i;
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156 | i *= G.remote.lines;
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157 | if (G.data == NULL) {
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158 | G.size = i;
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159 | G.data = xzalloc(2 * i);
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160 | }
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161 | else if (G.size != i) {
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162 | cleanup(1);
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163 | }
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164 | data = G.data + G.current;
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165 | xread(vcsa_fd, data, G.size);
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166 | close(vcsa_fd);
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167 | for (i = 0; i < G.remote.lines; i++) {
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168 | for (j = 0; j < G.remote.cols; j++, NEXT(data)) {
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169 | unsigned x = j - G.x; // if will catch j < G.x too
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170 | unsigned y = i - G.y; // if will catch i < G.y too
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171 |
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172 | if (CHAR(data) < ' ')
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173 | CHAR(data) = ' ';
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174 | if (y >= G.height || x >= G.width)
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175 | DATA(data) = 0;
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176 | }
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177 | }
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178 | }
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179 |
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180 | static void screen_char(char *data)
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181 | {
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182 | if (!BW) {
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183 | uint8_t attr = ATTR(data);
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184 | //uint8_t attr = ATTR(data) >> 1; // for framebuffer console
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185 | uint8_t attr_diff = G.last_attr ^ attr;
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186 |
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187 | if (attr_diff) {
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188 | // Attribute layout for VGA compatible text videobuffer:
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189 | // blinking text
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190 | // |red bkgd
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191 | // ||green bkgd
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192 | // |||blue bkgd
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193 | // vvvv
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194 | // 00000000 <- lsb bit on the right
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195 | // bold text / text 8th bit
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196 | // red text
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197 | // green text
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198 | // blue text
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199 | // TODO: apparently framebuffer-based console uses different layout
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200 | // (bug? attempt to get 8th text bit in better position?)
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201 | // red bkgd
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202 | // |green bkgd
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203 | // ||blue bkgd
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204 | // vvv
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205 | // 00000000 <- lsb bit on the right
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206 | // bold text
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207 | // red text
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208 | // green text
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209 | // blue text
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210 | // text 8th bit
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211 | // converting RGB color bit triad to BGR:
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212 | static const char color[8] = "04261537";
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213 | const uint8_t fg_mask = 0x07, bold_mask = 0x08;
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214 | const uint8_t bg_mask = 0x70, blink_mask = 0x80;
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215 | char *ptr;
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216 |
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217 | ptr = G.attrbuf + 2; // skip "ESC ["
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218 |
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219 | // (G.last_attr & ~attr) has 1 only where
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220 | // G.last_attr has 1 but attr has 0.
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221 | // Here we check whether we have transition
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222 | // bold->non-bold or blink->non-blink:
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223 | if (G.last_attr < 0 // initial value
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224 | || ((G.last_attr & ~attr) & (bold_mask | blink_mask)) != 0
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225 | ) {
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226 | *ptr++ = '0'; // "reset all attrs"
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227 | *ptr++ = ';';
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228 | // must set fg & bg, maybe need to set bold or blink:
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229 | attr_diff = attr | ~(bold_mask | blink_mask);
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230 | }
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231 | G.last_attr = attr;
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232 | if (attr_diff & bold_mask) {
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233 | *ptr++ = '1';
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234 | *ptr++ = ';';
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235 | }
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236 | if (attr_diff & blink_mask) {
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237 | *ptr++ = '5';
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238 | *ptr++ = ';';
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239 | }
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240 | if (attr_diff & fg_mask) {
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241 | *ptr++ = '3';
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242 | *ptr++ = color[attr & fg_mask];
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243 | *ptr++ = ';';
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244 | }
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245 | if (attr_diff & bg_mask) {
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246 | *ptr++ = '4';
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247 | *ptr++ = color[(attr & bg_mask) >> 4];
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248 | *ptr++ = ';';
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249 | }
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250 | if (ptr != G.attrbuf + 2) {
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251 | ptr[-1] = 'm';
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252 | *ptr = '\0';
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253 | fputs(G.attrbuf, stdout);
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254 | }
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255 | }
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256 | }
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257 | putchar(CHAR(data));
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258 | G.col++;
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259 | }
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260 |
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261 | static void screen_dump(void)
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262 | {
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263 | int linefeed_cnt;
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264 | int line, col;
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265 | int linecnt = G.remote.lines - G.y;
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266 | char *data = G.data + G.current + G.first_line_offset;
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267 |
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268 | linefeed_cnt = 0;
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269 | for (line = 0; line < linecnt && line < G.height; line++) {
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270 | int space_cnt = 0;
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271 | for (col = 0; col < G.remote.cols; col++, NEXT(data)) {
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272 | unsigned tty_col = col - G.x; // if will catch col < G.x too
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273 |
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274 | if (tty_col >= G.width)
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275 | continue;
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276 | space_cnt++;
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277 | if (BW && CHAR(data) == ' ')
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278 | continue;
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279 | while (linefeed_cnt != 0) {
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280 | //bb_putchar('\r'); - tty driver does it for us
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281 | bb_putchar('\n');
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282 | linefeed_cnt--;
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283 | }
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284 | while (--space_cnt)
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285 | bb_putchar(' ');
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286 | screen_char(data);
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287 | }
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288 | linefeed_cnt++;
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289 | }
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290 | }
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291 |
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292 | static void curmove(void)
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293 | {
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294 | unsigned cx = G.remote.cursor_x - G.x;
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295 | unsigned cy = G.remote.cursor_y - G.y;
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296 | int cursor = 1;
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297 |
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298 | if (cx < G.width && cy < G.height) {
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299 | gotoxy(cx, cy);
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300 | cursor = -1;
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301 | }
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302 | set_cursor(cursor);
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303 | }
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304 |
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305 | static void create_cdev_if_doesnt_exist(const char* name, dev_t dev)
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306 | {
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307 | int fd = open(name, O_RDONLY);
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308 | if (fd != -1)
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309 | close(fd);
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310 | else if (errno == ENOENT)
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311 | mknod(name, S_IFCHR | 0660, dev);
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312 | }
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313 |
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314 | static NOINLINE void start_shell_in_child(const char* tty_name)
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315 | {
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316 | int pid = xvfork();
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317 | if (pid == 0) {
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318 | struct termios termchild;
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319 | char *shell = getenv("SHELL");
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320 |
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321 | if (!shell)
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322 | shell = (char *) DEFAULT_SHELL;
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323 | signal(SIGHUP, SIG_IGN);
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324 | // set tty as a controlling tty
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325 | setsid();
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326 | // make tty to be input, output, error
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327 | close(0);
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328 | xopen(tty_name, O_RDWR); // uses fd 0
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329 | xdup2(0, 1);
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330 | xdup2(0, 2);
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331 | ioctl(0, TIOCSCTTY, 1);
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332 | tcsetpgrp(0, getpid());
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333 | tcgetattr(0, &termchild);
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334 | termchild.c_lflag |= ECHO;
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335 | termchild.c_oflag |= ONLCR | XTABS;
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336 | termchild.c_iflag |= ICRNL;
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337 | termchild.c_iflag &= ~IXOFF;
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338 | tcsetattr_stdin_TCSANOW(&termchild);
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339 | execl(shell, shell, "-i", (char *) NULL);
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340 | bb_simple_perror_msg_and_die(shell);
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341 | }
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342 | }
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343 |
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344 | int conspy_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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345 | int conspy_main(int argc UNUSED_PARAM, char **argv)
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346 | {
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347 | char tty_name[sizeof("/dev/ttyNN")];
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348 | #define keybuf bb_common_bufsiz1
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349 | struct termios termbuf;
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350 | unsigned opts;
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351 | unsigned ttynum;
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352 | int poll_timeout_ms;
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353 | #if ENABLE_LONG_OPTS
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354 | static const char getopt_longopts[] ALIGN1 =
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355 | "viewonly\0" No_argument "v"
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356 | "createdevice\0" No_argument "c"
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357 | "session\0" No_argument "s"
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358 | "nocolors\0" No_argument "n"
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359 | "dump\0" No_argument "d"
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360 | "follow\0" No_argument "f"
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361 | ;
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362 |
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363 | applet_long_options = getopt_longopts;
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364 | #endif
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365 | INIT_G();
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366 | strcpy(G.vcsa_name, "/dev/vcsa");
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367 |
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368 | opt_complementary = "x+:y+"; // numeric params
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369 | opts = getopt32(argv, "vcsndfx:y:", &G.x, &G.y);
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370 | argv += optind;
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371 | ttynum = 0;
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372 | if (argv[0]) {
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373 | ttynum = xatou_range(argv[0], 0, 63);
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374 | sprintf(G.vcsa_name + sizeof("/dev/vcsa")-1, "%u", ttynum);
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375 | }
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376 | sprintf(tty_name, "%s%u", "/dev/tty", ttynum);
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377 | if (opts & FLAG(c)) {
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378 | if ((opts & (FLAG(s)|FLAG(v))) != FLAG(v))
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379 | create_cdev_if_doesnt_exist(tty_name, makedev(4, ttynum));
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380 | create_cdev_if_doesnt_exist(G.vcsa_name, makedev(7, 128 + ttynum));
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381 | }
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382 | if ((opts & FLAG(s)) && ttynum) {
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383 | start_shell_in_child(tty_name);
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384 | }
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385 |
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386 | screen_read_close();
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387 | if (opts & FLAG(d)) {
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388 | screen_dump();
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389 | bb_putchar('\n');
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390 | return 0;
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391 | }
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392 |
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393 | bb_signals(BB_FATAL_SIGS, cleanup);
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394 |
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395 | // All characters must be passed through to us unaltered
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396 | G.kbd_fd = xopen(CURRENT_TTY, O_RDONLY);
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397 | tcgetattr(G.kbd_fd, &G.term_orig);
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398 | termbuf = G.term_orig;
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399 | termbuf.c_iflag &= ~(BRKINT|INLCR|ICRNL|IXON|IXOFF|IUCLC|IXANY|IMAXBEL);
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400 | //termbuf.c_oflag &= ~(OPOST); - no, we still want \n -> \r\n
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401 | termbuf.c_lflag &= ~(ISIG|ICANON|ECHO);
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402 | termbuf.c_cc[VMIN] = 1;
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403 | termbuf.c_cc[VTIME] = 0;
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404 | tcsetattr(G.kbd_fd, TCSANOW, &termbuf);
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405 |
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406 | poll_timeout_ms = 250;
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407 | while (1) {
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408 | struct pollfd pfd;
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409 | int bytes_read;
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410 | int i, j;
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411 | char *data, *old;
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412 |
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413 | // in the first loop G.width = G.height = 0: refresh
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414 | i = G.width;
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415 | j = G.height;
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416 | get_terminal_width_height(G.kbd_fd, &G.width, &G.height);
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417 | if (option_mask32 & FLAG(f)) {
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418 | int nx = G.remote.cursor_x - G.width + 1;
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419 | int ny = G.remote.cursor_y - G.height + 1;
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420 |
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421 | if (G.remote.cursor_x < G.x) {
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422 | G.x = G.remote.cursor_x;
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423 | i = 0; // force refresh
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424 | }
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425 | if (nx > G.x) {
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426 | G.x = nx;
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427 | i = 0; // force refresh
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428 | }
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429 | if (G.remote.cursor_y < G.y) {
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430 | G.y = G.remote.cursor_y;
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431 | i = 0; // force refresh
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432 | }
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433 | if (ny > G.y) {
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434 | G.y = ny;
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435 | i = 0; // force refresh
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436 | }
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437 | }
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438 |
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439 | // Scan console data and redraw our tty where needed
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440 | old = G.data + G.current;
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441 | G.current = G.size - G.current;
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442 | data = G.data + G.current;
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443 | screen_read_close();
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444 | if (i != G.width || j != G.height) {
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---|
445 | clrscr();
|
---|
446 | screen_dump();
|
---|
447 | } else {
|
---|
448 | // For each remote line
|
---|
449 | old += G.first_line_offset;
|
---|
450 | data += G.first_line_offset;
|
---|
451 | for (i = G.y; i < G.remote.lines; i++) {
|
---|
452 | char *first = NULL; // first char which needs updating
|
---|
453 | char *last = last; // last char which needs updating
|
---|
454 | unsigned iy = i - G.y;
|
---|
455 |
|
---|
456 | if (iy >= G.height)
|
---|
457 | break;
|
---|
458 | for (j = 0; j < G.remote.cols; j++, NEXT(old), NEXT(data)) {
|
---|
459 | unsigned jx = j - G.x; // if will catch j >= G.x too
|
---|
460 |
|
---|
461 | if (jx < G.width && DATA(data) != DATA(old)) {
|
---|
462 | last = data;
|
---|
463 | if (!first) {
|
---|
464 | first = data;
|
---|
465 | gotoxy(jx, iy);
|
---|
466 | }
|
---|
467 | }
|
---|
468 | }
|
---|
469 | if (first) {
|
---|
470 | // Rewrite updated data on the local screen
|
---|
471 | for (; first <= last; NEXT(first))
|
---|
472 | screen_char(first);
|
---|
473 | }
|
---|
474 | }
|
---|
475 | }
|
---|
476 | curmove();
|
---|
477 |
|
---|
478 | // Wait for local user keypresses
|
---|
479 | fflush_all();
|
---|
480 | pfd.fd = G.kbd_fd;
|
---|
481 | pfd.events = POLLIN;
|
---|
482 | bytes_read = 0;
|
---|
483 | switch (poll(&pfd, 1, poll_timeout_ms)) {
|
---|
484 | char *k;
|
---|
485 | case -1:
|
---|
486 | if (errno != EINTR)
|
---|
487 | cleanup(1);
|
---|
488 | break;
|
---|
489 | case 0:
|
---|
490 | if (++G.nokeys >= 4)
|
---|
491 | G.nokeys = G.escape_count = 0;
|
---|
492 | break;
|
---|
493 | default:
|
---|
494 | // Read the keys pressed
|
---|
495 | k = keybuf + G.key_count;
|
---|
496 | bytes_read = read(G.kbd_fd, k, sizeof(keybuf) - G.key_count);
|
---|
497 | if (bytes_read < 0)
|
---|
498 | cleanup(1);
|
---|
499 |
|
---|
500 | // Do exit processing
|
---|
501 | for (i = 0; i < bytes_read; i++) {
|
---|
502 | if (k[i] != '\033')
|
---|
503 | G.escape_count = 0;
|
---|
504 | else if (++G.escape_count >= 3)
|
---|
505 | cleanup(0);
|
---|
506 | }
|
---|
507 | }
|
---|
508 | poll_timeout_ms = 250;
|
---|
509 |
|
---|
510 | // Insert all keys pressed into the virtual console's input
|
---|
511 | // buffer. Don't do this if the virtual console is in scan
|
---|
512 | // code mode - giving ASCII characters to a program expecting
|
---|
513 | // scan codes will confuse it.
|
---|
514 | if (!(option_mask32 & FLAG(v)) && G.escape_count == 0) {
|
---|
515 | int handle, result;
|
---|
516 | long kbd_mode;
|
---|
517 |
|
---|
518 | G.key_count += bytes_read;
|
---|
519 | handle = xopen(tty_name, O_WRONLY);
|
---|
520 | result = ioctl(handle, KDGKBMODE, &kbd_mode);
|
---|
521 | if (result >= 0) {
|
---|
522 | char *p = keybuf;
|
---|
523 |
|
---|
524 | if (kbd_mode != K_XLATE && kbd_mode != K_UNICODE) {
|
---|
525 | G.key_count = 0; // scan code mode
|
---|
526 | }
|
---|
527 | for (; G.key_count != 0; p++, G.key_count--) {
|
---|
528 | result = ioctl(handle, TIOCSTI, p);
|
---|
529 | if (result < 0) {
|
---|
530 | memmove(keybuf, p, G.key_count);
|
---|
531 | break;
|
---|
532 | }
|
---|
533 | // If there is an application on console which reacts
|
---|
534 | // to keypresses, we need to make our first sleep
|
---|
535 | // shorter to quickly redraw whatever it printed there.
|
---|
536 | poll_timeout_ms = 20;
|
---|
537 | }
|
---|
538 | }
|
---|
539 | // Close & re-open tty in case they have
|
---|
540 | // swapped virtual consoles
|
---|
541 | close(handle);
|
---|
542 |
|
---|
543 | // We sometimes get spurious IO errors on the TTY
|
---|
544 | // as programs close and re-open it
|
---|
545 | if (result >= 0)
|
---|
546 | G.ioerror_count = 0;
|
---|
547 | else if (errno != EIO || ++G.ioerror_count > 4)
|
---|
548 | cleanup(1);
|
---|
549 | }
|
---|
550 | } /* while (1) */
|
---|
551 | }
|
---|