[2649eef] | 1 | /** |
---|
| 2 | * @file |
---|
| 3 | * |
---|
| 4 | * @author Sebastian Huber <sebastian.huber@embedded-brains.de> |
---|
| 5 | * |
---|
| 6 | * @brief Shell login prompt functions. |
---|
| 7 | */ |
---|
| 8 | |
---|
| 9 | /* |
---|
| 10 | * Copyright (c) 2009 |
---|
| 11 | * embedded brains GmbH |
---|
| 12 | * Obere Lagerstr. 30 |
---|
| 13 | * D-82178 Puchheim |
---|
| 14 | * Germany |
---|
| 15 | * <rtems@embedded-brains.de> |
---|
| 16 | * |
---|
| 17 | * Based on work from Chris Johns, Fernando Ruiz and Till Straumann. |
---|
| 18 | * |
---|
| 19 | * The license and distribution terms for this file may be |
---|
| 20 | * found in the file LICENSE in this distribution or at |
---|
| 21 | * http://www.rtems.com/license/LICENSE. |
---|
| 22 | */ |
---|
| 23 | |
---|
| 24 | #include <stdio.h> |
---|
| 25 | #include <termios.h> |
---|
| 26 | #include <unistd.h> |
---|
| 27 | #include <ctype.h> |
---|
| 28 | |
---|
| 29 | #include <rtems/login.h> |
---|
| 30 | |
---|
| 31 | static int rtems_shell_discard( int c, FILE *stream) |
---|
| 32 | { |
---|
| 33 | return c; |
---|
| 34 | } |
---|
| 35 | |
---|
| 36 | static void rtems_shell_get_text( |
---|
| 37 | FILE *in, |
---|
| 38 | FILE *out, |
---|
| 39 | char *line, |
---|
| 40 | size_t size |
---|
| 41 | ) |
---|
| 42 | { |
---|
| 43 | int fd_in = fileno( in); |
---|
| 44 | int (*put)( int, FILE *) = |
---|
| 45 | out != NULL && isatty( fd_in) |
---|
| 46 | ? fputc |
---|
| 47 | : rtems_shell_discard; |
---|
| 48 | size_t i = 0; |
---|
| 49 | |
---|
| 50 | if (size < 1) { |
---|
| 51 | return; |
---|
| 52 | } |
---|
| 53 | |
---|
| 54 | tcdrain( fd_in); |
---|
| 55 | if (out != NULL){ |
---|
| 56 | tcdrain( fileno( out)); |
---|
| 57 | } |
---|
| 58 | |
---|
| 59 | while (true) { |
---|
| 60 | int c = fgetc( in); |
---|
| 61 | |
---|
| 62 | switch (c) { |
---|
| 63 | case EOF: |
---|
| 64 | /* Here comes an ugly hack: The Termios driver's read() handler returns |
---|
| 65 | * 0 to the C library's fgets() if it times out. fgets() interprets |
---|
| 66 | * this (correctly) as EOF, a condition we want to undo since it's not |
---|
| 67 | * really true since we really have a read error (Termios bug?). |
---|
| 68 | * |
---|
| 69 | * As a workaround we push something back and read it again. This |
---|
| 70 | * should simply reset the EOF condition. |
---|
| 71 | */ |
---|
| 72 | if (ungetc( '?', in) == '?') { |
---|
| 73 | fgetc( in); |
---|
| 74 | } |
---|
| 75 | break; |
---|
| 76 | case '\n': |
---|
| 77 | case '\r': |
---|
| 78 | put( '\n', out); |
---|
| 79 | line [i] = '\0'; |
---|
| 80 | return; |
---|
| 81 | case 127: |
---|
| 82 | case '\b': |
---|
| 83 | if (i > 0) { |
---|
| 84 | put( '\b', out); |
---|
| 85 | put( ' ', out); |
---|
| 86 | put( '\b', out); |
---|
| 87 | --i; |
---|
| 88 | } else { |
---|
| 89 | put( '\a', out); |
---|
| 90 | } |
---|
| 91 | break; |
---|
| 92 | default: |
---|
| 93 | if (!iscntrl( c)) { |
---|
| 94 | if (i < size - 1) { |
---|
| 95 | line [i] = (char) c; |
---|
| 96 | ++i; |
---|
| 97 | put( c, out); |
---|
| 98 | } else { |
---|
| 99 | put( '\a', out); |
---|
| 100 | } |
---|
| 101 | } else { |
---|
| 102 | put( '\a', out); |
---|
| 103 | } |
---|
| 104 | break; |
---|
| 105 | } |
---|
| 106 | } |
---|
| 107 | } |
---|
| 108 | |
---|
| 109 | bool rtems_shell_login_prompt( |
---|
| 110 | FILE *in, |
---|
| 111 | FILE *out, |
---|
| 112 | const char *device, |
---|
| 113 | rtems_login_check check |
---|
| 114 | ) |
---|
| 115 | { |
---|
| 116 | int fd_in = fileno( in); |
---|
| 117 | struct termios termios_previous; |
---|
| 118 | bool restore_termios = false; |
---|
| 119 | int i = 0; |
---|
| 120 | bool result = false; |
---|
| 121 | |
---|
| 122 | if (tcgetattr( fd_in, &termios_previous) == 0) { |
---|
| 123 | struct termios termios_new = termios_previous; |
---|
| 124 | |
---|
| 125 | termios_new.c_lflag &= ~ECHO; |
---|
| 126 | termios_new.c_lflag &= ~ICANON; |
---|
| 127 | termios_new.c_cc [VTIME] = 255; |
---|
| 128 | termios_new.c_cc [VMIN] = 0; |
---|
| 129 | |
---|
| 130 | restore_termios = tcsetattr( fd_in, TCSANOW, &termios_new) == 0; |
---|
| 131 | } |
---|
| 132 | |
---|
| 133 | for (i = 0; i < 3; ++i) { |
---|
| 134 | char user [32]; |
---|
| 135 | char passphrase [128]; |
---|
| 136 | |
---|
| 137 | fprintf( out, "%s login: ", device); |
---|
| 138 | fflush( out); |
---|
| 139 | rtems_shell_get_text( in, out, user, sizeof( user)); |
---|
| 140 | |
---|
| 141 | fflush( in); |
---|
| 142 | fprintf( out, "Password: "); |
---|
| 143 | fflush( out); |
---|
| 144 | rtems_shell_get_text( in, NULL, passphrase, sizeof( passphrase)); |
---|
| 145 | fputc( '\n', out); |
---|
| 146 | |
---|
| 147 | result = check( user, passphrase); |
---|
| 148 | if (result) { |
---|
| 149 | break; |
---|
| 150 | } |
---|
| 151 | |
---|
| 152 | fprintf( out, "Login incorrect\n\n"); |
---|
| 153 | sleep( 2); |
---|
| 154 | } |
---|
| 155 | |
---|
| 156 | if (restore_termios) { |
---|
| 157 | /* What to do if restoring the flags fails? */ |
---|
| 158 | tcsetattr( fd_in, TCSANOW, &termios_previous); |
---|
| 159 | } |
---|
| 160 | |
---|
| 161 | return result; |
---|
| 162 | } |
---|