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Do not use getpass(3)

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This commit is contained in:
Eric Andersen
2004-05-01 01:27:30 +00:00
parent 90d2bff4c6
commit 6f9a7783ce
7 changed files with 98 additions and 38 deletions
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87
libbb/bb_askpass.c Normal file
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@ -0,0 +1,87 @@
/* vi: set sw=4 ts=4: */
/*
* Ask for a password
* I use a static buffer in this function. Plan accordingly.
*
* Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <fcntl.h>
#include <signal.h>
#include <termios.h>
#include <sys/ioctl.h>
#define PWD_BUFFER_SIZE 256
/* do nothing signal handler */
static void askpass_timeout(int ignore)
{
}
char *bb_askpass(int timeout, const char * prompt)
{
char *ret;
int i, size;
struct sigaction sa;
struct termios old, new;
static char passwd[PWD_BUFFER_SIZE];
tcgetattr(STDIN_FILENO, &old);
size = sizeof(passwd);
ret = passwd;
memset(passwd, 0, size);
fputs(prompt, stdout);
fflush(stdout);
tcgetattr(STDIN_FILENO, &new);
new.c_iflag &= ~(IUCLC|IXON|IXOFF|IXANY);
new.c_lflag &= ~(ECHO|ECHOE|ECHOK|ECHONL|TOSTOP);
tcsetattr(STDIN_FILENO, TCSANOW, &new);
if (timeout) {
sa.sa_flags = 0;
sa.sa_handler = askpass_timeout;
sigaction(SIGALRM, &sa, NULL);
alarm(timeout);
}
if (read(STDIN_FILENO, passwd, size-1) <= 0) {
ret = NULL;
} else {
for(i = 0; i < size && passwd[i]; i++) {
if (passwd[i]== '\r' || passwd[i] == '\n') {
passwd[i]= 0;
break;
}
}
}
if (timeout) {
alarm(0);
}
tcsetattr(STDIN_FILENO, TCSANOW, &old);
fputs("\n", stdout);
fflush(stdout);
return ret;
}