1 | /* Copyright (C) 1992-1998 Free Software Foundation, Inc.
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2 | This file is part of the GNU C Library.
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3 |
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4 | The GNU C Library is free software; you can redistribute it and/or
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5 | modify it under the terms of the GNU Lesser General Public License as
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6 | published by the Free Software Foundation; either version 3 of the
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7 | License, or (at your option) any later version.
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8 |
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9 | The GNU C Library is distributed in the hope that it will be useful,
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10 | but WITHOUT ANY WARRANTY; without even the implied warranty of
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11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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12 | Library General Public License for more details.
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13 |
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14 | You should have received a copy of the GNU Lesser General Public
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15 | License along with the GNU C Library; see the file COPYING.LIB. If
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16 | not, see <http://www.gnu.org/licenses/>. */
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17 |
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18 | /* Modified to use with samba by Jeremy Allison, 8th July 1995. */
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19 |
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20 | #include "replace.h"
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21 | #include "system/filesys.h"
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22 | #include "system/wait.h"
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23 | #include "system/terminal.h"
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24 | #include "system/passwd.h"
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25 |
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26 | /*
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27 | * Define additional missing types
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28 | */
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29 | #ifndef HAVE_SIG_ATOMIC_T_TYPE
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30 | typedef int sig_atomic_t;
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31 | #endif
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32 |
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33 | #ifndef SIGCLD
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34 | #define SIGCLD SIGCHLD
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35 | #endif
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36 |
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37 | #ifdef SYSV_TERMIO
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38 |
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39 | /* SYSTEM V TERMIO HANDLING */
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40 |
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41 | static struct termio t;
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42 |
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43 | #define ECHO_IS_ON(t) ((t).c_lflag & ECHO)
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44 | #define TURN_ECHO_OFF(t) ((t).c_lflag &= ~ECHO)
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45 | #define TURN_ECHO_ON(t) ((t).c_lflag |= ECHO)
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46 |
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47 | #ifndef TCSAFLUSH
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48 | #define TCSAFLUSH 1
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49 | #endif
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50 |
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51 | #ifndef TCSANOW
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52 | #define TCSANOW 0
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53 | #endif
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54 |
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55 | static int tcgetattr(int fd, struct termio *_t)
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56 | {
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57 | return ioctl(fd, TCGETA, _t);
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58 | }
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59 |
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60 | static int tcsetattr(int fd, int flags, struct termio *_t)
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61 | {
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62 | if(flags & TCSAFLUSH)
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63 | ioctl(fd, TCFLSH, TCIOFLUSH);
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64 | return ioctl(fd, TCSETS, _t);
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65 | }
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66 |
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67 | #elif !defined(TCSAFLUSH)
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68 |
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69 | /* BSD TERMIO HANDLING */
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70 |
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71 | static struct sgttyb t;
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72 |
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73 | #define ECHO_IS_ON(t) ((t).sg_flags & ECHO)
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74 | #define TURN_ECHO_OFF(t) ((t).sg_flags &= ~ECHO)
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75 | #define TURN_ECHO_ON(t) ((t).sg_flags |= ECHO)
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76 |
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77 | #define TCSAFLUSH 1
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78 | #define TCSANOW 0
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79 |
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80 | static int tcgetattr(int fd, struct sgttyb *_t)
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81 | {
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82 | return ioctl(fd, TIOCGETP, (char *)_t);
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83 | }
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84 |
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85 | static int tcsetattr(int fd, int flags, struct sgttyb *_t)
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86 | {
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87 | return ioctl(fd, TIOCSETP, (char *)_t);
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88 | }
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89 |
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90 | #else /* POSIX TERMIO HANDLING */
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91 | #define ECHO_IS_ON(t) ((t).c_lflag & ECHO)
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92 | #define TURN_ECHO_OFF(t) ((t).c_lflag &= ~ECHO)
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93 | #define TURN_ECHO_ON(t) ((t).c_lflag |= ECHO)
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94 |
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95 | static struct termios t;
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96 | #endif /* SYSV_TERMIO */
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97 |
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98 | static void catch_signal(int signum, void (*handler)(int ))
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99 | {
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100 | #ifdef HAVE_SIGACTION
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101 | struct sigaction act;
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102 | struct sigaction oldact;
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103 |
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104 | memset(&act, 0, sizeof(act));
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105 |
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106 | act.sa_handler = handler;
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107 | #ifdef SA_RESTART
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108 | /*
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109 | * We *want* SIGALRM to interrupt a system call.
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110 | */
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111 | if(signum != SIGALRM)
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112 | act.sa_flags = SA_RESTART;
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113 | #endif
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114 | sigemptyset(&act.sa_mask);
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115 | sigaddset(&act.sa_mask,signum);
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116 | sigaction(signum,&act,&oldact);
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117 | #else /* !HAVE_SIGACTION */
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118 | /* FIXME: need to handle sigvec and systems with broken signal() */
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119 | signal(signum, handler);
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120 | #endif
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121 | }
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122 |
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123 | static sig_atomic_t gotintr;
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124 | static int in_fd = -1;
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125 |
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126 | /***************************************************************
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127 | Signal function to tell us were ^C'ed.
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128 | ****************************************************************/
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129 |
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130 | static void gotintr_sig(int signum)
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131 | {
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132 | gotintr = 1;
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133 | if (in_fd != -1)
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134 | close(in_fd); /* Safe way to force a return. */
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135 | in_fd = -1;
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136 | }
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137 |
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138 | char *rep_getpass(const char *prompt)
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139 | {
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140 | FILE *in, *out;
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141 | int echo_off;
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142 | static char buf[256];
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143 | static size_t bufsize = sizeof(buf);
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144 | size_t nread;
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145 |
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146 | /* Catch problematic signals */
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147 | catch_signal(SIGINT, gotintr_sig);
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148 |
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149 | /* Try to write to and read from the terminal if we can.
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150 | If we can't open the terminal, use stderr and stdin. */
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151 |
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152 | in = fopen ("/dev/tty", "w+");
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153 | if (in == NULL) {
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154 | in = stdin;
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155 | out = stderr;
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156 | } else {
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157 | out = in;
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158 | }
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159 |
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160 | setvbuf(in, NULL, _IONBF, 0);
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161 |
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162 | /* Turn echoing off if it is on now. */
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163 |
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164 | if (tcgetattr (fileno (in), &t) == 0) {
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165 | if (ECHO_IS_ON(t)) {
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166 | TURN_ECHO_OFF(t);
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167 | echo_off = tcsetattr (fileno (in), TCSAFLUSH, &t) == 0;
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168 | TURN_ECHO_ON(t);
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169 | } else {
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170 | echo_off = 0;
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171 | }
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172 | } else {
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173 | echo_off = 0;
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174 | }
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175 |
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176 | /* Write the prompt. */
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177 | fputs(prompt, out);
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178 | fflush(out);
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179 |
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180 | /* Read the password. */
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181 | buf[0] = 0;
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182 | if (!gotintr) {
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183 | in_fd = fileno(in);
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184 | if (fgets(buf, bufsize, in) == NULL) {
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185 | buf[0] = 0;
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186 | }
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187 | }
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188 | nread = strlen(buf);
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189 | if (nread) {
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190 | if (buf[nread - 1] == '\n')
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191 | buf[nread - 1] = '\0';
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192 | }
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193 |
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194 | /* Restore echoing. */
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195 | if (echo_off) {
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196 | if (gotintr && in_fd == -1) {
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197 | in = fopen ("/dev/tty", "w+");
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198 | }
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199 | if (in != NULL)
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200 | tcsetattr (fileno (in), TCSANOW, &t);
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201 | }
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202 |
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203 | fprintf(out, "\n");
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204 | fflush(out);
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205 |
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206 | if (in && in != stdin) /* We opened the terminal; now close it. */
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207 | fclose(in);
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208 |
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209 | /* Catch problematic signals */
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210 | catch_signal(SIGINT, SIG_DFL);
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211 |
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212 | if (gotintr) {
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213 | printf("Interrupted by signal.\n");
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214 | fflush(stdout);
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215 | exit(1);
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216 | }
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217 | return buf;
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218 | }
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