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/* getpass.c -- read a password without echo.
*
* Portions of this code are 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.
*/
#include "h/mh.h"
#include "getpass.h"
#include <termios.h>
/* We don't use MAX_PASS here because the maximum password length on a remote
POP daemon will have nothing to do with the length on our OS. 256 is
arbitrary but hopefully big enough to accommodate everyone. */
#define MAX_PASSWORD_LEN 256
#ifndef TCSANOW
#define TCSANOW 0
#endif
char *
nmh_getpass(const char *prompt)
{
struct termios oterm, term;
int ch;
char *p;
FILE *fout, *fin;
static char buf[MAX_PASSWORD_LEN + 1];
int istty = isatty(fileno(stdin));
/* Find if stdin is connect to a terminal. If so, read directly from
* the terminal, and turn off echo. Otherwise read from stdin.
*/
if (!istty || !(fout = fin = fopen("/dev/tty", "w+"))) {
fout = stderr;
fin = stdin;
} else /* Reading directly from terminal here */
{
(void)tcgetattr(fileno(fin), &oterm);
term = oterm; /* Save original info */
term.c_lflag &= ~ECHO;
(void)fputs(prompt, fout);
rewind(fout); /* implied flush */
(void)tcsetattr(fileno(fin), TCSANOW, &term);
}
for (p = buf; (ch = getc(fin)) != EOF &&
ch != '\n' &&
p < buf + MAX_PASSWORD_LEN;)
*p++ = ch;
*p = '\0';
if (istty && fin != stdin) {
(void)tcsetattr(fileno(fin), TCSANOW, &oterm);
rewind(fout);
(void)fputc('\n', fout);
(void)fclose(fin);
}
return buf;
}
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