diff options
Diffstat (limited to 'lib/libc/gen/getpass.c')
-rw-r--r-- | lib/libc/gen/getpass.c | 125 |
1 files changed, 125 insertions, 0 deletions
diff --git a/lib/libc/gen/getpass.c b/lib/libc/gen/getpass.c new file mode 100644 index 0000000..658f5b6 --- /dev/null +++ b/lib/libc/gen/getpass.c @@ -0,0 +1,125 @@ +/* + * Copyright (c) 1988, 1993 + * The Regents of the University of California. All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. All advertising materials mentioning features or use of this software + * must display the following acknowledgement: + * This product includes software developed by the University of + * California, Berkeley and its contributors. + * 4. Neither the name of the University nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ + +#if defined(LIBC_SCCS) && !defined(lint) +static char sccsid[] = "@(#)getpass.c 8.1 (Berkeley) 6/4/93"; +#endif /* LIBC_SCCS and not lint */ + +#include <sys/termios.h> +#include <signal.h> + +#include <paths.h> +#include <pwd.h> +#include <stdio.h> +#include <unistd.h> + +static struct termios oterm, term; +static sig_t ointhandler, oquithandler, otstphandler, oconthandler; +static FILE *fp; + +static void +sighandler(int signo) +{ + /* restore tty state */ + (void)tcsetattr(fileno(fp), TCSAFLUSH|TCSASOFT, &oterm); + + /* restore old sig handlers */ + (void)signal(SIGINT, ointhandler); + (void)signal(SIGQUIT, oquithandler); + (void)signal(SIGTSTP, otstphandler); + + /* resend us this signal */ + (void)kill(getpid(), signo); +} + +/* ARGSUSED */ +static void +sigconthandler(int signo) +{ + /* re-install our signal handlers */ + ointhandler = signal(SIGINT, sighandler); + oquithandler = signal(SIGQUIT, sighandler); + otstphandler = signal(SIGTSTP, sighandler); + + /* turn off echo again */ + (void)tcsetattr(fileno(fp), TCSAFLUSH|TCSASOFT, &term); +} + + +char * +getpass(prompt) + const char *prompt; +{ + register int ch; + register char *p; + FILE *outfp; + long omask; + static char buf[_PASSWORD_LEN + 1]; + + /* + * read and write to /dev/tty if possible; else read from + * stdin and write to stderr. + */ + if ((outfp = fp = fopen(_PATH_TTY, "w+")) == NULL) { + outfp = stderr; + fp = stdin; + } + + ointhandler = signal(SIGINT, sighandler); + oquithandler = signal(SIGQUIT, sighandler); + otstphandler = signal(SIGTSTP, sighandler); + oconthandler = signal(SIGCONT, sigconthandler); + + (void)tcgetattr(fileno(fp), &oterm); + term = oterm; + term.c_lflag &= ~ECHO; + (void)tcsetattr(fileno(fp), TCSAFLUSH|TCSASOFT, &term); + (void)fputs(prompt, outfp); + rewind(outfp); /* implied flush */ + for (p = buf; (ch = getc(fp)) != EOF && ch != '\n';) + if (p < buf + _PASSWORD_LEN) + *p++ = ch; + *p = '\0'; + (void)write(fileno(outfp), "\n", 1); + (void)tcsetattr(fileno(fp), TCSAFLUSH|TCSASOFT, &oterm); + + /* restore old sig handlers */ + (void)signal(SIGINT, ointhandler); + (void)signal(SIGQUIT, oquithandler); + (void)signal(SIGTSTP, otstphandler); + (void)signal(SIGCONT, oconthandler); + + if (fp != stdin) + (void)fclose(fp); + return(buf); +} |