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/* $OpenBSD: cli.c,v 1.10 2001/03/01 03:38:33 deraadt Exp $ */
/*
* Copyright (c) 2000 Markus Friedl. 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.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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 "includes.h"
RCSID("$OpenBSD: cli.c,v 1.10 2001/03/01 03:38:33 deraadt Exp $");
#include "xmalloc.h"
#include "log.h"
#include "cli.h"
static int cli_input = -1;
static int cli_output = -1;
static int cli_from_stdin = 0;
sigset_t oset;
sigset_t nset;
struct sigaction nsa;
struct sigaction osa;
struct termios ntio;
struct termios otio;
int echo_modified;
volatile int intr;
static int
cli_open(int from_stdin)
{
if (cli_input >= 0 && cli_output >= 0 && cli_from_stdin == from_stdin)
return 1;
if (from_stdin) {
if (!cli_from_stdin && cli_input >= 0) {
(void)close(cli_input);
}
cli_input = STDIN_FILENO;
cli_output = STDERR_FILENO;
} else {
cli_input = cli_output = open(_PATH_TTY, O_RDWR);
if (cli_input < 0)
fatal("You have no controlling tty. Cannot read passphrase.");
}
cli_from_stdin = from_stdin;
return cli_input >= 0 && cli_output >= 0 && cli_from_stdin == from_stdin;
}
static void
cli_close(void)
{
if (!cli_from_stdin && cli_input >= 0)
close(cli_input);
cli_input = -1;
cli_output = -1;
cli_from_stdin = 0;
return;
}
void
intrcatch(int sig)
{
intr = 1;
}
static void
cli_echo_disable(void)
{
sigemptyset(&nset);
sigaddset(&nset, SIGTSTP);
(void) sigprocmask(SIG_BLOCK, &nset, &oset);
intr = 0;
memset(&nsa, 0, sizeof(nsa));
nsa.sa_handler = intrcatch;
(void) sigaction(SIGINT, &nsa, &osa);
echo_modified = 0;
if (tcgetattr(cli_input, &otio) == 0 && (otio.c_lflag & ECHO)) {
echo_modified = 1;
ntio = otio;
ntio.c_lflag &= ~(ECHO | ECHOE | ECHOK | ECHONL);
(void) tcsetattr(cli_input, TCSANOW, &ntio);
}
return;
}
static void
cli_echo_restore(void)
{
if (echo_modified != 0) {
tcsetattr(cli_input, TCSANOW, &otio);
echo_modified = 0;
}
(void) sigprocmask(SIG_SETMASK, &oset, NULL);
(void) sigaction(SIGINT, &osa, NULL);
if (intr != 0) {
kill(getpid(), SIGINT);
sigemptyset(&nset);
/* XXX tty has not neccessarily drained by now? */
sigsuspend(&nset);
intr = 0;
}
return;
}
static int
cli_read(char* buf, int size, int echo)
{
char ch = 0;
int i = 0;
if (!echo)
cli_echo_disable();
while (ch != '\n') {
if (read(cli_input, &ch, 1) != 1)
break;
if (ch == '\n' || intr != 0)
break;
if (i < size)
buf[i++] = ch;
}
buf[i] = '\0';
if (!echo)
cli_echo_restore();
if (!intr && !echo)
(void) write(cli_output, "\n", 1);
return i;
}
static int
cli_write(const char* buf, int size)
{
int i, len, pos, ret = 0;
char *output, *p;
output = xmalloc(4*size);
for (p = output, i = 0; i < size; i++) {
if (buf[i] == '\n' || buf[i] == '\r')
*p++ = buf[i];
else
p = vis(p, buf[i], 0, 0);
}
len = p - output;
for (pos = 0; pos < len; pos += ret) {
ret = write(cli_output, output + pos, len - pos);
if (ret == -1) {
xfree(output);
return -1;
}
}
xfree(output);
return 0;
}
/*
* Presents a prompt and returns the response allocated with xmalloc().
* Uses /dev/tty or stdin/out depending on arg. Optionally disables echo
* of response depending on arg. Tries to ensure that no other userland
* buffer is storing the response.
*/
char*
cli_read_passphrase(const char* prompt, int from_stdin, int echo_enable)
{
char buf[BUFSIZ];
char* p;
if (!cli_open(from_stdin))
fatal("Cannot read passphrase.");
fflush(stdout);
cli_write(prompt, strlen(prompt));
cli_read(buf, sizeof buf, echo_enable);
cli_close();
p = xstrdup(buf);
memset(buf, 0, sizeof(buf));
return (p);
}
char*
cli_prompt(char* prompt, int echo_enable)
{
return cli_read_passphrase(prompt, 0, echo_enable);
}
void
cli_mesg(char* mesg)
{
cli_open(0);
cli_write(mesg, strlen(mesg));
cli_write("\n", strlen("\n"));
cli_close();
return;
}
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