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15637ed4 RG |
1 | /* |
2 | * Copyright (c) 1988 The Regents of the University of California. | |
3 | * All rights reserved. | |
4 | * | |
5 | * Redistribution and use in source and binary forms, with or without | |
6 | * modification, are permitted provided that the following conditions | |
7 | * are met: | |
8 | * 1. Redistributions of source code must retain the above copyright | |
9 | * notice, this list of conditions and the following disclaimer. | |
10 | * 2. Redistributions in binary form must reproduce the above copyright | |
11 | * notice, this list of conditions and the following disclaimer in the | |
12 | * documentation and/or other materials provided with the distribution. | |
13 | * 3. All advertising materials mentioning features or use of this software | |
14 | * must display the following acknowledgement: | |
15 | * This product includes software developed by the University of | |
16 | * California, Berkeley and its contributors. | |
17 | * 4. Neither the name of the University nor the names of its contributors | |
18 | * may be used to endorse or promote products derived from this software | |
19 | * without specific prior written permission. | |
20 | * | |
21 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND | |
22 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
23 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
24 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE | |
25 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
26 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
27 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
28 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | |
29 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | |
30 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |
31 | * SUCH DAMAGE. | |
32 | */ | |
33 | ||
34 | #if defined(LIBC_SCCS) && !defined(lint) | |
35 | static char sccsid[] = "@(#)getpass.c 5.9 (Berkeley) 5/6/91"; | |
36 | #endif /* LIBC_SCCS and not lint */ | |
37 | ||
38 | #include <sys/termios.h> | |
39 | #include <sys/signal.h> | |
40 | #include <stdio.h> | |
41 | #include <unistd.h> | |
42 | #include <pwd.h> | |
43 | ||
44 | char * | |
45 | getpass(prompt) | |
46 | const char *prompt; | |
47 | { | |
48 | struct termios term; | |
49 | register int ch; | |
50 | register char *p; | |
51 | FILE *fp, *outfp; | |
52 | long omask; | |
53 | int echo; | |
54 | static char buf[_PASSWORD_LEN + 1]; | |
55 | ||
56 | /* | |
57 | * read and write to /dev/tty if possible; else read from | |
58 | * stdin and write to stderr. | |
59 | */ | |
60 | if ((outfp = fp = fopen("/dev/tty", "w+")) == NULL) { | |
61 | outfp = stderr; | |
62 | fp = stdin; | |
63 | } | |
64 | /* | |
65 | * note - blocking signals isn't necessarily the | |
66 | * right thing, but we leave it for now. | |
67 | */ | |
68 | omask = sigblock(sigmask(SIGINT)|sigmask(SIGTSTP)); | |
69 | (void)tcgetattr(fileno(fp), &term); | |
70 | if (echo = (term.c_lflag & ECHO)) { | |
71 | term.c_lflag &= ~ECHO; | |
72 | (void)tcsetattr(fileno(fp), TCSAFLUSH|TCSASOFT, &term); | |
73 | } | |
74 | (void)fputs(prompt, outfp); | |
75 | rewind(outfp); /* implied flush */ | |
76 | for (p = buf; (ch = getc(fp)) != EOF && ch != '\n';) | |
77 | if (p < buf + _PASSWORD_LEN) | |
78 | *p++ = ch; | |
79 | *p = '\0'; | |
80 | (void)write(fileno(outfp), "\n", 1); | |
81 | if (echo) { | |
82 | term.c_lflag |= ECHO; | |
83 | tcsetattr(fileno(fp), TCSAFLUSH|TCSASOFT, &term); | |
84 | } | |
85 | (void)sigsetmask(omask); | |
86 | if (fp != stdin) | |
87 | (void)fclose(fp); | |
88 | return(buf); | |
89 | } |