1 | #ifndef _NO_GETPASS |
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2 | /* |
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3 | * Copyright (c) 1988 The Regents of the University of California. |
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4 | * All rights reserved. |
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5 | * |
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6 | * Redistribution and use in source and binary forms, with or without |
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7 | * modification, are permitted provided that the following conditions |
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8 | * are met: |
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9 | * 1. Redistributions of source code must retain the above copyright |
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10 | * notice, this list of conditions and the following disclaimer. |
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11 | * 2. Redistributions in binary form must reproduce the above copyright |
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12 | * notice, this list of conditions and the following disclaimer in the |
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13 | * documentation and/or other materials provided with the distribution. |
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14 | * 4. Neither the name of the University nor the names of its contributors |
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15 | * may be used to endorse or promote products derived from this software |
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16 | * without specific prior written permission. |
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17 | * |
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18 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
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19 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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20 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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21 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
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22 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
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23 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
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24 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
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25 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
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26 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
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27 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
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28 | * SUCH DAMAGE. |
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29 | */ |
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30 | |
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31 | #if defined(LIBC_SCCS) && !defined(lint) |
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32 | static char sccsid[] = "@(#)getpass.c 5.9 (Berkeley) 5/6/91"; |
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33 | #endif /* LIBC_SCCS and not lint */ |
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34 | |
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35 | #include <stdio.h> |
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36 | #include <unistd.h> |
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37 | #include <pwd.h> |
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38 | #include <sys/termios.h> |
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39 | #include <sys/signal.h> |
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40 | #include <_syslist.h> |
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41 | |
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42 | #ifndef _PATH_PASSWD |
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43 | #define _PATH_PASSWD "/etc/passwd" |
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44 | #endif |
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45 | |
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46 | #ifndef _PASSWORD_LEN |
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47 | #define _PASSWORD_LEN 128 /* max length, not counting NULL */ |
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48 | #endif |
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49 | |
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50 | char * |
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51 | getpass (prompt) |
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52 | const char *prompt; |
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53 | { |
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54 | struct termios term; |
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55 | register int ch; |
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56 | register char *p; |
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57 | FILE *fp, *outfp; |
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58 | long omask; |
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59 | int echo; |
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60 | static char buf[_PASSWORD_LEN + 1]; |
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61 | |
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62 | /* |
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63 | * read and write to /dev/tty if possible; else read from |
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64 | * stdin and write to stderr. |
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65 | */ |
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66 | |
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67 | if ((outfp = fp = fopen ("/dev/tty", "w+")) == NULL) |
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68 | { |
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69 | outfp = stderr; |
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70 | fp = stdin; |
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71 | } |
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72 | /* |
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73 | * note - blocking signals isn't necessarily the |
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74 | * right thing, but we leave it for now. |
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75 | */ |
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76 | omask = sigblock (sigmask (SIGINT) | sigmask (SIGTSTP)); |
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77 | (void) tcgetattr (fileno (fp), &term); |
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78 | echo = (term.c_lflag & ECHO); |
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79 | if (echo) |
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80 | { |
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81 | term.c_lflag &= ~ECHO; |
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82 | (void) tcsetattr (fileno (fp), TCSAFLUSH, &term); |
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83 | } |
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84 | (void) fputs (prompt, outfp); |
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85 | rewind (outfp); /* implied flush */ |
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86 | for (p = buf; (ch = getc (fp)) != EOF && ch != '\n';) |
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87 | if (p < buf + _PASSWORD_LEN) |
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88 | *p++ = ch; |
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89 | *p = '\0'; |
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90 | (void) write (fileno (outfp), "\n", 1); |
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91 | if (echo) |
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92 | { |
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93 | term.c_lflag |= ECHO; |
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94 | tcsetattr (fileno (fp), TCSAFLUSH, &term); |
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95 | } |
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96 | (void) sigsetmask (omask); |
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97 | if (fp != stdin) |
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98 | (void) fclose (fp); |
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99 | return buf; |
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100 | } |
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101 | #endif /* !_NO_GETPASS */ |
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