1 | /** |
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2 | * @file |
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3 | * |
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4 | * @brief Shell login prompt functions. |
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5 | */ |
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6 | |
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7 | /* |
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8 | * Authorship |
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9 | * ---------- |
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10 | * Parts of this software was created by |
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11 | * Till Straumann <strauman@slac.stanford.edu>, 2003-2007 |
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12 | * Stanford Linear Accelerator Center, Stanford University. |
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13 | * |
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14 | * Acknowledgement of sponsorship |
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15 | * ------------------------------ |
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16 | * Parts of this software was produced by |
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17 | * the Stanford Linear Accelerator Center, Stanford University, |
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18 | * under Contract DE-AC03-76SFO0515 with the Department of Energy. |
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19 | * |
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20 | * Government disclaimer of liability |
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21 | * ---------------------------------- |
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22 | * Neither the United States nor the United States Department of Energy, |
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23 | * nor any of their employees, makes any warranty, express or implied, or |
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24 | * assumes any legal liability or responsibility for the accuracy, |
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25 | * completeness, or usefulness of any data, apparatus, product, or process |
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26 | * disclosed, or represents that its use would not infringe privately owned |
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27 | * rights. |
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28 | * |
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29 | * Stanford disclaimer of liability |
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30 | * -------------------------------- |
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31 | * Stanford University makes no representations or warranties, express or |
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32 | * implied, nor assumes any liability for the use of this software. |
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33 | * |
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34 | * Stanford disclaimer of copyright |
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35 | * -------------------------------- |
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36 | * Stanford University, owner of the copyright, hereby disclaims its |
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37 | * copyright and all other rights in this software. Hence, anyone may |
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38 | * freely use it for any purpose without restriction. |
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39 | * |
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40 | * Maintenance of notices |
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41 | * ---------------------- |
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42 | * In the interest of clarity regarding the origin and status of this |
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43 | * SLAC software, this and all the preceding Stanford University notices |
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44 | * are to remain affixed to any copy or derivative of this software made |
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45 | * or distributed by the recipient and are to be affixed to any copy of |
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46 | * software made or distributed by the recipient that contains a copy or |
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47 | * derivative of this software. |
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48 | * |
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49 | * ------------------ SLAC Software Notices, Set 4 OTT.002a, 2004 FEB 03 |
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50 | * |
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51 | * Copyright (c) 2009 embedded brains GmbH and others. |
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52 | * |
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53 | * embedded brains GmbH |
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54 | * Obere Lagerstr. 30 |
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55 | * D-82178 Puchheim |
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56 | * Germany |
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57 | * <rtems@embedded-brains.de> |
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58 | * |
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59 | * Based on work from Chris Johns, Fernando Ruiz and Till Straumann. |
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60 | * |
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61 | * Derived from files "cpukit/libmisc/shell/shell.c" and |
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62 | * "cpukit/telnetd/check_passwd.c". |
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63 | * |
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64 | * The license and distribution terms for this file may be |
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65 | * found in the file LICENSE in this distribution or at |
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66 | * http://www.rtems.com/license/LICENSE. |
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67 | */ |
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68 | |
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69 | #include <stdio.h> |
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70 | #include <termios.h> |
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71 | #include <unistd.h> |
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72 | #include <ctype.h> |
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73 | |
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74 | #include <rtems/shell.h> |
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75 | |
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76 | static int rtems_shell_discard( int c, FILE *stream) |
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77 | { |
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78 | return c; |
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79 | } |
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80 | |
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81 | static void rtems_shell_get_text( |
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82 | FILE *in, |
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83 | FILE *out, |
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84 | char *line, |
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85 | size_t size |
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86 | ) |
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87 | { |
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88 | int fd_in = fileno( in); |
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89 | int (*put)( int, FILE *) = |
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90 | out != NULL && isatty( fd_in) |
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91 | ? fputc |
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92 | : rtems_shell_discard; |
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93 | size_t i = 0; |
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94 | |
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95 | if (size < 1) { |
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96 | return; |
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97 | } |
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98 | |
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99 | tcdrain( fd_in); |
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100 | if (out != NULL){ |
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101 | tcdrain( fileno( out)); |
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102 | } |
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103 | |
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104 | while (true) { |
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105 | int c = fgetc( in); |
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106 | |
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107 | switch (c) { |
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108 | case EOF: |
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109 | /* Here comes an ugly hack: The Termios driver's read() handler returns |
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110 | * 0 to the C library's fgets() if it times out. fgets() interprets |
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111 | * this (correctly) as EOF, a condition we want to undo since it's not |
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112 | * really true since we really have a read error (Termios bug?). |
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113 | * |
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114 | * As a workaround we push something back and read it again. This |
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115 | * should simply reset the EOF condition. |
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116 | */ |
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117 | if (ungetc( '?', in) == '?') { |
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118 | fgetc( in); |
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119 | } |
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120 | break; |
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121 | case '\n': |
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122 | case '\r': |
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123 | put( '\n', out); |
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124 | line [i] = '\0'; |
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125 | return; |
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126 | case 127: |
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127 | case '\b': |
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128 | if (i > 0) { |
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129 | put( '\b', out); |
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130 | put( ' ', out); |
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131 | put( '\b', out); |
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132 | --i; |
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133 | } else { |
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134 | put( '\a', out); |
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135 | } |
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136 | break; |
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137 | default: |
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138 | if (!iscntrl( c)) { |
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139 | if (i < size - 1) { |
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140 | line [i] = (char) c; |
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141 | ++i; |
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142 | put( c, out); |
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143 | } else { |
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144 | put( '\a', out); |
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145 | } |
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146 | } else { |
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147 | put( '\a', out); |
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148 | } |
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149 | break; |
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150 | } |
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151 | } |
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152 | } |
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153 | |
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154 | bool rtems_shell_login_prompt( |
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155 | FILE *in, |
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156 | FILE *out, |
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157 | const char *device, |
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158 | rtems_shell_login_check_t check |
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159 | ) |
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160 | { |
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161 | int fd_in = fileno( in); |
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162 | struct termios termios_previous; |
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163 | bool restore_termios = false; |
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164 | int i = 0; |
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165 | bool result = false; |
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166 | |
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167 | if (tcgetattr( fd_in, &termios_previous) == 0) { |
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168 | struct termios termios_new = termios_previous; |
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169 | |
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170 | termios_new.c_lflag &= ~ECHO; |
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171 | termios_new.c_lflag &= ~ICANON; |
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172 | termios_new.c_cc [VTIME] = 255; |
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173 | termios_new.c_cc [VMIN] = 0; |
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174 | |
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175 | restore_termios = tcsetattr( fd_in, TCSANOW, &termios_new) == 0; |
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176 | } |
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177 | |
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178 | for (i = 0; i < 3; ++i) { |
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179 | char user [32]; |
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180 | char passphrase [128]; |
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181 | |
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182 | fprintf( out, "%s login: ", device); |
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183 | fflush( out); |
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184 | rtems_shell_get_text( in, out, user, sizeof( user)); |
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185 | |
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186 | fflush( in); |
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187 | fprintf( out, "Password: "); |
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188 | fflush( out); |
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189 | rtems_shell_get_text( in, NULL, passphrase, sizeof( passphrase)); |
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190 | fputc( '\n', out); |
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191 | |
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192 | result = check( user, passphrase); |
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193 | if (result) { |
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194 | break; |
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195 | } |
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196 | |
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197 | fprintf( out, "Login incorrect\n\n"); |
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198 | sleep( 2); |
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199 | } |
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200 | |
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201 | if (restore_termios) { |
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202 | /* What to do if restoring the flags fails? */ |
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203 | tcsetattr( fd_in, TCSANOW, &termios_previous); |
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204 | } |
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205 | |
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206 | return result; |
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207 | } |
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