Cleanup:
[dragonfly.git] / lib / libc / gen / readpassphrase.c
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1/* $OpenBSD: readpassphrase.c,v 1.12 2001/12/15 05:41:00 millert Exp $ */
2
3/*
4 * Copyright (c) 2000 Todd C. Miller <Todd.Miller@courtesan.com>
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. The name of the author may not be used to endorse or promote products
16 * derived from this software without specific prior written permission.
17 *
18 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
19 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
20 * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
21 * THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
22 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
23 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
24 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
25 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
26 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
27 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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28 *
29 * $OpenBSD: readpassphrase.c,v 1.12 2001/12/15 05:41:00 millert Exp $
30 * $FreeBSD: src/lib/libc/gen/readpassphrase.c,v 1.6.2.2 2002/06/30 13:54:26 des Exp $
c778e4e0 31 * $DragonFly: src/lib/libc/gen/readpassphrase.c,v 1.3 2005/04/26 08:46:54 joerg Exp $
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32 */
33
c778e4e0 34#include "namespace.h"
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35#include <ctype.h>
36#include <errno.h>
37#include <fcntl.h>
38#include <paths.h>
39#include <pwd.h>
40#include <signal.h>
41#include <string.h>
42#include <termios.h>
43#include <unistd.h>
44#include <readpassphrase.h>
c778e4e0 45#include "un-namespace.h"
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46
47static volatile sig_atomic_t signo;
48
49static void handler(int);
50
51char *
52readpassphrase(const char *prompt, char *buf, size_t bufsiz, int flags)
53{
54 ssize_t nr;
55 int input, output, save_errno;
56 char ch, *p, *end;
57 struct termios term, oterm;
58 struct sigaction sa, saveint, savehup, savequit, saveterm;
59 struct sigaction savetstp, savettin, savettou;
60
61 /* I suppose we could alloc on demand in this case (XXX). */
62 if (bufsiz == 0) {
63 errno = EINVAL;
64 return(NULL);
65 }
66
67restart:
68 /*
69 * Read and write to /dev/tty if available. If not, read from
70 * stdin and write to stderr unless a tty is required.
71 */
72 if ((input = output = _open(_PATH_TTY, O_RDWR)) == -1) {
73 if (flags & RPP_REQUIRE_TTY) {
74 errno = ENOTTY;
75 return(NULL);
76 }
77 input = STDIN_FILENO;
78 output = STDERR_FILENO;
79 }
80
81 /*
82 * Catch signals that would otherwise cause the user to end
83 * up with echo turned off in the shell. Don't worry about
84 * things like SIGALRM and SIGPIPE for now.
85 */
86 sigemptyset(&sa.sa_mask);
87 sa.sa_flags = 0; /* don't restart system calls */
88 sa.sa_handler = handler;
89 (void)_sigaction(SIGINT, &sa, &saveint);
90 (void)_sigaction(SIGHUP, &sa, &savehup);
91 (void)_sigaction(SIGQUIT, &sa, &savequit);
92 (void)_sigaction(SIGTERM, &sa, &saveterm);
93 (void)_sigaction(SIGTSTP, &sa, &savetstp);
94 (void)_sigaction(SIGTTIN, &sa, &savettin);
95 (void)_sigaction(SIGTTOU, &sa, &savettou);
96
97 /* Turn off echo if possible. */
98 if (tcgetattr(input, &oterm) == 0) {
99 memcpy(&term, &oterm, sizeof(term));
100 if (!(flags & RPP_ECHO_ON))
101 term.c_lflag &= ~(ECHO | ECHONL);
102 if (term.c_cc[VSTATUS] != _POSIX_VDISABLE)
103 term.c_cc[VSTATUS] = _POSIX_VDISABLE;
104 (void)tcsetattr(input, TCSAFLUSH|TCSASOFT, &term);
105 } else {
106 memset(&term, 0, sizeof(term));
107 memset(&oterm, 0, sizeof(oterm));
108 }
109
110 (void)_write(output, prompt, strlen(prompt));
111 end = buf + bufsiz - 1;
112 for (p = buf; (nr = _read(input, &ch, 1)) == 1 && ch != '\n' && ch != '\r';) {
113 if (p < end) {
114 if ((flags & RPP_SEVENBIT))
115 ch &= 0x7f;
116 if (isalpha(ch)) {
117 if ((flags & RPP_FORCELOWER))
118 ch = tolower(ch);
119 if ((flags & RPP_FORCEUPPER))
120 ch = toupper(ch);
121 }
122 *p++ = ch;
123 }
124 }
125 *p = '\0';
126 save_errno = errno;
127 if (!(term.c_lflag & ECHO))
128 (void)_write(output, "\n", 1);
129
130 /* Restore old terminal settings and signals. */
131 if (memcmp(&term, &oterm, sizeof(term)) != 0)
132 (void)tcsetattr(input, TCSANOW|TCSASOFT, &oterm);
133 (void)_sigaction(SIGINT, &saveint, NULL);
134 (void)_sigaction(SIGHUP, &savehup, NULL);
135 (void)_sigaction(SIGQUIT, &savequit, NULL);
136 (void)_sigaction(SIGTERM, &saveterm, NULL);
137 (void)_sigaction(SIGTSTP, &savetstp, NULL);
138 (void)_sigaction(SIGTTIN, &savettin, NULL);
139 (void)_sigaction(SIGTTOU, &savettou, NULL);
140 if (input != STDIN_FILENO)
141 (void)_close(input);
142
143 /*
144 * If we were interrupted by a signal, resend it to ourselves
145 * now that we have restored the signal handlers.
146 */
147 if (signo) {
148 kill(getpid(), signo);
149 switch (signo) {
150 case SIGTSTP:
151 case SIGTTIN:
152 case SIGTTOU:
153 signo = 0;
154 goto restart;
155 }
156 }
157
158 errno = save_errno;
159 return(nr == -1 ? NULL : buf);
160}
161
162char *
163getpass(const char *prompt)
164{
165 static char buf[_PASSWORD_LEN + 1];
166
167 if (readpassphrase(prompt, buf, sizeof(buf), RPP_ECHO_OFF) == NULL)
168 buf[0] = '\0';
169 return(buf);
170}
171
172static void handler(int s)
173{
174
175 signo = s;
176}