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putpwd.c
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/*====================================================================*
*
* Copyright (c) 2015 Qualcomm Atheros, Inc.
*
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or
* without modification, are permitted (subject to the limitations
* in the disclaimer below) provided that the following conditions
* are met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* * 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.
*
* * Neither the name of Qualcomm Atheros nor the names of
* its contributors may be used to endorse or promote products
* derived from this software without specific prior written
* permission.
*
* NO EXPRESS OR IMPLIED LICENSES TO ANY PARTY'S PATENT RIGHTS ARE
* GRANTED BY THIS LICENSE. THIS SOFTWARE IS PROVIDED BY THE
* COPYRIGHT HOLDERS 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 COPYRIGHT OWNER
* 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.
*
*--------------------------------------------------------------------*/
/*====================================================================*
*
* void putpwd (unsigned count, unsigned group, char space);
*
* keys.h
*
* print a random password on stdout; passwords consist of count
* letters and digits; optionally, group letters and digits and
* separate groups with a space character;
*
* alphabet is an array of 32 printable password characters;
* count is the number of characters to be selected from alphabet;
* group is the grouping factor;
* space is the group separator;
*
* grouping is suppressed when group is zero or greater than or
* equal to count;
*
* Contributors:
* Charles Maier <cmaier@qca.qualcomm.com>
*
*--------------------------------------------------------------------*/
#ifndef PUTPWD_SOURCE
#define PUTPWD_SOURCE
#include <unistd.h>
#include <stdio.h>
#include <fcntl.h>
#include <errno.h>
#include "../tools/types.h"
#include "../tools/error.h"
#include "../key/keys.h"
void putpwd (unsigned count, unsigned group, char space)
{
signed fd;
if ((fd = open ("/dev/urandom", O_RDONLY)) == -1)
{
error (1, errno, "can't open /dev/urandom");
}
while (count--)
{
static const char alphabet [] =
{
'2',
'3',
'4',
'5',
'6',
'7',
'8',
'9',
'A',
'B',
'C',
'D',
'E',
'F',
'G',
'H',
'J',
'K',
'L',
'M',
'N',
'P',
'Q',
'R',
'S',
'T',
'U',
'V',
'W',
'X',
'Y',
'Z'
};
unsigned member;
if (read (fd, & member, sizeof (member)) != sizeof (member))
{
error (1, errno, "can't read /dev/urandom");
}
member &= 0x1F;
putc (alphabet [member % sizeof (alphabet)], stdout);
if ((count) && (group) && ! (count % group))
{
putc (space, stdout);
}
}
close (fd);
return;
}
#endif
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