├── Makefile ├── README.md ├── main.c └── LICENSE.txt /Makefile: -------------------------------------------------------------------------------- 1 | 2 | all: key-input-fwd 3 | 4 | key-input-fwd: main.c 5 | $(CC) -Wall -std=c11 -o key-input-fwd main.c 6 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | 2 | This program listens on key input events on the terminal and generates 3 | uinput key press/release events matching those. 4 | 5 | The use-case is the following: 6 | 7 | 1. ssh to the computer which doesn't have any keyboard attached 8 | 2. run some program requiring access to user input events in 9 | background 10 | 3. run key-input-fwd 11 | 4. start typing 12 | 5. evens should be forwarded to the program running in background. 13 | -------------------------------------------------------------------------------- /main.c: -------------------------------------------------------------------------------- 1 | /* 2 | * Author: Philippe Normand 3 | * 4 | * This program is free software: you can redistribute it and/or 5 | * modify it under the terms of the GNU Lesser General Public License 6 | * as published by the Free Software Foundation, either version 3 of 7 | * the License, or (at your option) any later version. 8 | * 9 | * This program is distributed in the hope that it will be useful, 10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of 11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 12 | * GNU Lesser General Public License for more details. 13 | 14 | * You should have received a copy of the GNU Lesser General Public License 15 | * along with this program. If not, see . 16 | */ 17 | 18 | #include 19 | #include 20 | #include 21 | #include 22 | #include 23 | #include 24 | #include 25 | #include 26 | #include 27 | #include 28 | #include 29 | 30 | 31 | #define KK(kc, lc, uc) [lc] = { kc }, [uc] = { kc, .shift = 1 } 32 | #define KL(kc, uc) KK(kc, uc + ('a' - 'A'), uc) 33 | 34 | static const struct { 35 | int key; 36 | unsigned shift : 1; 37 | } s_keytable[256] = { 38 | KK(KEY_0, '0', ')'), 39 | KK(KEY_1, '1', '!'), 40 | KK(KEY_2, '2', '@'), 41 | KK(KEY_3, '3', '#'), 42 | KK(KEY_4, '4', '$'), 43 | KK(KEY_5, '5', '%'), 44 | KK(KEY_6, '6', '^'), 45 | KK(KEY_7, '7', '&'), 46 | KK(KEY_8, '8', '*'), 47 | KK(KEY_9, '9', '('), 48 | 49 | KL(KEY_A, 'A'), KL(KEY_B, 'B'), KL(KEY_C, 'C'), KL(KEY_D, 'D'), 50 | KL(KEY_E, 'E'), KL(KEY_F, 'F'), KL(KEY_G, 'G'), KL(KEY_H, 'H'), 51 | KL(KEY_I, 'I'), KL(KEY_J, 'J'), KL(KEY_K, 'K'), KL(KEY_L, 'L'), 52 | KL(KEY_M, 'M'), KL(KEY_N, 'N'), KL(KEY_O, 'O'), KL(KEY_P, 'P'), 53 | KL(KEY_Q, 'Q'), KL(KEY_R, 'R'), KL(KEY_S, 'S'), KL(KEY_T, 'T'), 54 | KL(KEY_U, 'U'), KL(KEY_V, 'V'), KL(KEY_W, 'W'), KL(KEY_X, 'X'), 55 | KL(KEY_Y, 'Y'), KL(KEY_Z, 'Z'), 56 | 57 | KK(KEY_APOSTROPHE, '\'', '"'), 58 | KK(KEY_BACKSLASH, '\\', '|'), 59 | KK(KEY_COMMA, ',', '<'), 60 | KK(KEY_DOT, '.', '>'), 61 | KK(KEY_EQUAL, '=', '+'), 62 | KK(KEY_GRAVE, '`', '~'), 63 | KK(KEY_LEFTBRACE, '[', '{'), 64 | KK(KEY_MINUS, '-', '_'), 65 | KK(KEY_RIGHTBRACE, ']', '}'), 66 | KK(KEY_SEMICOLON, ';', ':'), 67 | KK(KEY_SLASH, '/', '?'), 68 | 69 | [ 27 ] = { KEY_ESC }, 70 | [ 65 ] = { KEY_UP }, 71 | [ 66 ] = { KEY_DOWN }, 72 | [ 67 ] = { KEY_RIGHT }, 73 | [ 68 ] = { KEY_LEFT }, 74 | [127 ] = { KEY_BACKSPACE }, 75 | [' ' ] = { KEY_SPACE }, 76 | ['\b'] = { KEY_BACKSPACE }, 77 | ['\n'] = { KEY_ENTER }, 78 | ['\t'] = { KEY_TAB }, 79 | }; 80 | 81 | #undef KL 82 | #undef KK 83 | 84 | 85 | static struct termios old, new; 86 | static int fd; 87 | 88 | /* Initialize new terminal i/o settings */ 89 | void initTermios() { 90 | tcgetattr(0, &old); /* grab old terminal i/o settings */ 91 | new = old; /* make new settings same as old settings */ 92 | new.c_lflag &= ~ICANON; /* disable buffered i/o */ 93 | new.c_lflag &= ~ECHO; /* disable echo mode */ 94 | tcsetattr(0, TCSANOW, &new); /* use these new terminal i/o settings now */ 95 | } 96 | 97 | /* Restore old terminal i/o settings */ 98 | void resetTermios(void) { 99 | tcsetattr(0, TCSANOW, &old); 100 | } 101 | 102 | void send_key_event(int fd, unsigned int keycode, int keyvalue) { 103 | struct input_event event; 104 | gettimeofday(&event.time, NULL); 105 | 106 | event.type = EV_KEY; 107 | event.code = keycode; 108 | event.value = keyvalue; 109 | 110 | if (write(fd, &event, sizeof(event)) < 0) 111 | printf("simulate key error\n"); 112 | 113 | event.type = EV_SYN; 114 | event.code = SYN_REPORT; 115 | event.value = 0; 116 | write(fd, &event, sizeof(event)); 117 | if (write(fd, &event, sizeof(event)) < 0) 118 | printf("simulate key error\n"); 119 | } 120 | 121 | void intHandler(int dummy) { 122 | resetTermios(); 123 | ioctl(fd, UI_DEV_DESTROY); 124 | close(fd); 125 | 126 | exit(0); 127 | } 128 | 129 | int main(int argc, char** argv) { 130 | struct uinput_user_dev uidev; 131 | 132 | signal(SIGINT, intHandler); 133 | 134 | fd = open("/dev/uinput", O_WRONLY | O_NONBLOCK); 135 | if (fd < 0) { 136 | printf("Failed to open uinput\n"); 137 | return -1; 138 | } 139 | 140 | ioctl(fd, UI_SET_EVBIT, EV_KEY); 141 | ioctl(fd, UI_SET_EVBIT, EV_SYN); 142 | 143 | ioctl(fd, UI_SET_KEYBIT, KEY_LEFTSHIFT); 144 | 145 | for (unsigned i = 0; i < sizeof(s_keytable) / sizeof(s_keytable[0]); i++) { 146 | if (s_keytable[i].key) { 147 | ioctl(fd, UI_SET_KEYBIT, s_keytable[i].key); 148 | } 149 | } 150 | 151 | memset(&uidev, 0, sizeof(uidev)); 152 | snprintf(uidev.name, UINPUT_MAX_NAME_SIZE, "uinput-sample"); 153 | uidev.id.bustype = BUS_USB; 154 | uidev.id.vendor = 0x1234; 155 | uidev.id.product = 0xfedc; 156 | uidev.id.version = 1; 157 | write(fd, &uidev, sizeof(uidev)); 158 | 159 | ioctl(fd, UI_DEV_CREATE); 160 | sleep(1); 161 | initTermios(); 162 | 163 | while (1) { 164 | int cmd = getchar(); 165 | if (cmd == 27) { 166 | cmd = getchar(); 167 | cmd = getchar(); 168 | } 169 | 170 | int keycode = s_keytable[cmd & 0xFF].key; 171 | int shift = s_keytable[cmd & 0xFF].shift; 172 | 173 | if (keycode) { 174 | if (shift) 175 | send_key_event(fd, KEY_LEFTSHIFT, 1); 176 | send_key_event(fd, keycode, 1); 177 | send_key_event(fd, keycode, 0); 178 | if (shift) 179 | send_key_event(fd, KEY_LEFTSHIFT, 0); 180 | } else { 181 | fprintf(stderr, "unhandled key code: %d\n", cmd); 182 | } 183 | } 184 | 185 | resetTermios(); 186 | ioctl(fd, UI_DEV_DESTROY); 187 | close(fd); 188 | return 0; 189 | } 190 | -------------------------------------------------------------------------------- /LICENSE.txt: -------------------------------------------------------------------------------- 1 | GNU LIBRARY GENERAL PUBLIC LICENSE 2 | Version 2, June 1991 3 | 4 | Copyright (C) 1991 Free Software Foundation, Inc. 5 | 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 6 | Everyone is permitted to copy and distribute verbatim copies 7 | of this license document, but changing it is not allowed. 8 | 9 | [This is the first released version of the library GPL. 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