[3320] | 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 |
|
---|
| 421 | if (G.remote.cursor_x < G.x) {
|
---|
| 422 | G.x = G.remote.cursor_x;
|
---|
| 423 | i = 0; // force refresh
|
---|
| 424 | }
|
---|
| 425 | if (nx > G.x) {
|
---|
| 426 | G.x = nx;
|
---|
| 427 | i = 0; // force refresh
|
---|
| 428 | }
|
---|
| 429 | if (G.remote.cursor_y < G.y) {
|
---|
| 430 | G.y = G.remote.cursor_y;
|
---|
| 431 | i = 0; // force refresh
|
---|
| 432 | }
|
---|
| 433 | if (ny > G.y) {
|
---|
| 434 | G.y = ny;
|
---|
| 435 | i = 0; // force refresh
|
---|
| 436 | }
|
---|
| 437 | }
|
---|
| 438 |
|
---|
| 439 | // Scan console data and redraw our tty where needed
|
---|
| 440 | old = G.data + G.current;
|
---|
| 441 | G.current = G.size - G.current;
|
---|
| 442 | data = G.data + G.current;
|
---|
| 443 | screen_read_close();
|
---|
| 444 | if (i != G.width || j != G.height) {
|
---|
| 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 | }
|
---|