125 lines
3.9 KiB
C
125 lines
3.9 KiB
C
/*
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* Copyright (c) 1988, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#if defined(LIBC_SCCS) && !defined(lint)
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static char sccsid[] = "@(#)getpass.c 8.1 (Berkeley) 6/4/93";
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#endif /* LIBC_SCCS and not lint */
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#include <sys/termios.h>
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#include <signal.h>
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#include <paths.h>
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#include <pwd.h>
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#include <stdio.h>
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#include <unistd.h>
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static struct termios oterm, term;
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static sig_t ointhandler, oquithandler, otstphandler, oconthandler;
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static FILE *fp;
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static void
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sighandler(int signo)
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{
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/* restore tty state */
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(void)tcsetattr(fileno(fp), TCSAFLUSH|TCSASOFT, &oterm);
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/* restore old sig handlers */
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(void)signal(SIGINT, ointhandler);
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(void)signal(SIGQUIT, oquithandler);
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(void)signal(SIGTSTP, otstphandler);
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/* resend us this signal */
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(void)kill(getpid(), signo);
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}
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/* ARGSUSED */
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static void
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sigconthandler(int signo)
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{
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/* re-install our signal handlers */
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ointhandler = signal(SIGINT, sighandler);
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oquithandler = signal(SIGQUIT, sighandler);
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otstphandler = signal(SIGTSTP, sighandler);
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/* turn off echo again */
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(void)tcsetattr(fileno(fp), TCSAFLUSH|TCSASOFT, &term);
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}
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char *
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getpass(prompt)
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const char *prompt;
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{
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register int ch;
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register char *p;
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FILE *outfp;
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static char buf[_PASSWORD_LEN + 1];
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/*
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* read and write to /dev/tty if possible; else read from
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* stdin and write to stderr.
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*/
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if ((outfp = fp = fopen(_PATH_TTY, "w+")) == NULL) {
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outfp = stderr;
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fp = stdin;
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}
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ointhandler = signal(SIGINT, sighandler);
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oquithandler = signal(SIGQUIT, sighandler);
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otstphandler = signal(SIGTSTP, sighandler);
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oconthandler = signal(SIGCONT, sigconthandler);
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(void)tcgetattr(fileno(fp), &oterm);
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term = oterm;
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term.c_lflag &= ~ECHO;
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(void)tcsetattr(fileno(fp), TCSAFLUSH|TCSASOFT, &term);
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(void)fputs(prompt, outfp);
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rewind(outfp); /* implied flush */
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for (p = buf; (ch = getc(fp)) != EOF && ch != '\n';)
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if (p < buf + _PASSWORD_LEN)
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*p++ = ch;
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*p = '\0';
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(void)write(fileno(outfp), "\n", 1);
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(void)tcsetattr(fileno(fp), TCSAFLUSH|TCSASOFT, &oterm);
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/* restore old sig handlers */
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(void)signal(SIGINT, ointhandler);
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(void)signal(SIGQUIT, oquithandler);
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(void)signal(SIGTSTP, otstphandler);
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(void)signal(SIGCONT, oconthandler);
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if (fp != stdin)
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(void)fclose(fp);
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return(buf);
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}
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