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/*
* Copyright (c) 2011 Alex Hornung <alex@alexhornung.com>.
* 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 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 HOLDERS 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 <sys/types.h>
#include <getopt.h>
#include <stdio.h>
#include <stdlib.h>
#include <inttypes.h>
#include <errno.h>
#include <string.h>
#include <signal.h>
#include <time.h>

#include "tcplay.h"

#ifndef SIGINFO
#define SIGINFO SIGUSR1
#endif

static
void
sig_handler(int sig)
{
if ((sig == SIGUSR1 || sig == SIGINFO) && (summary_fn != NULL))
summary_fn();
}

static
void
usage(void)
{
fprintf(stderr,
"usage: tcplay -c -d device [-g] [-z] [-a pbkdb_hash] [-b cipher]\n"
" [-f keyfile_hidden] [-k keyfile] [-x pbkdf_hash] [-y cipher]\n"
" tcplay -i -d device [-e] [-f keyfile_hidden] [-k keyfile]\n"
" [-s system_devcie]\n"
" tcplay -m mapping -d device [-e] [-f keyfile_hidden] [-k keyfile]\n"
" [-s system_device]\n"
" tcplay -h | -v\n"
"\n"
"Valid commands are:\n"
" -c, --create\n"
"\t Creates a new TC volume on the device specified by -d or --device.\n"
" -h, --help\n"
"\t Print help message and exit.\n"
" -i, --info\n"
"\t Gives information about the TC volume specified by -d or --device.\n"
" -m <mapping name>, --map=<mapping name>\n"
"\t Creates a dm-crypt mapping with the given name for the device\n"
"\t specified by -d or --device.\n"
" -v, --version\n"
"\t Print version message and exit.\n"
"\n"
"Valid options for --create are:\n"
" -a <pbkdf prf algorithm>, --pbkdf-prf=<pbkdf prf algorithm>\n"
"\t Specifies which hashing function to use for the PBKDF password\n"
"\t derivation when creating a new volume.\n"
"\t To see valid options, specify '-a help'.\n"
" -b <cipher>, --cipher=<cipher>\n"
"\t Specifies which cipher to use when creating a new TC volume.\n"
"\t To see valid options, specify '-b help'.\n"
" -g, --hidden\n"
"\t Specifies that the newly created volume will contain a hidden volume.\n"
" -x <pbkdf prf algorithm>, --pbkdf-prf=<pbkdf prf algorithm>\n"
"\t Specifies which hashing function to use for the PBKDF password\n"
"\t derivation when creating a new hidden volume. By default, the\n"
"\t same as for the outer volume will be used.\n"
"\t To see valid options, specify '-x help'.\n"
" -y <cipher>, --cipher=<cipher>\n"
"\t Specifies which cipher to use when creating a new hidden volume.\n"
"\t By default, the same as for the outer volume will be used.\n"
"\t To see valid options, specify '-y help'.\n"
" -z, --insecure-erase\n"
"\t Skips the erase of the disk. Possible security hazard.\n"
"\n"
"Valid options for --info and --map are:\n"
" -e, --protect-hidden\n"
"\t Protect a hidden volume when mounting the outer volume.\n"
" -s <disk path>, --system-encryption=<disk path>\n"
"\t Specifies that the disk (e.g. /dev/da0) is using system encryption.\n"
"\n"
"Valid options common to all commands are:\n"
" -d <device path>, --device=<device path>\n"
"\t Specifies the path to the volume to operate on (e.g. /dev/da0s1).\n"
" -f <key file>, --keyfile-hidden=<key file>\n"
"\t Specifies a key file to use for the hidden volume password derivation.\n"
"\t This option is only valid in combination with -e, --protect-hidden\n"
"\t or -g, --hidden.\n"
" -k <key file>, --keyfile=<key file>\n"
"\t Specifies a key file to use for the password derivation, can appear\n"
"\t multiple times.\n"
);

exit(1);
}

static struct option longopts[] = {
{ "create", no_argument, NULL, 'c' },
{ "cipher", required_argument, NULL, 'b' },
{ "cipher-hidden", required_argument, NULL, 'y' },
{ "hidden", no_argument, NULL, 'g' },
{ "pbkdf-prf", required_argument, NULL, 'a' },
{ "pbkdf-prf-hidden", required_argument, NULL, 'x' },
{ "info", no_argument, NULL, 'i' },
{ "map", required_argument, NULL, 'm' },
{ "keyfile", required_argument, NULL, 'k' },
{ "keyfile-hidden", required_argument, NULL, 'f' },
{ "protect-hidden", no_argument, NULL, 'e' },
{ "device", required_argument, NULL, 'd' },
{ "system-encryption", required_argument, NULL, 's' },
{ "version", no_argument, NULL, 'v' },
{ "insecure-erase", no_argument, NULL, 'z' },
{ "help", no_argument, NULL, 'h' },
{ NULL, 0, NULL, 0 },
};

int
main(int argc, char *argv[])
{
const char *dev = NULL, *sys_dev = NULL, *map_name = NULL;
const char *keyfiles[MAX_KEYFILES];
const char *h_keyfiles[MAX_KEYFILES];
int nkeyfiles;
int n_hkeyfiles;
int ch, error;
int sflag = 0, info_vol = 0, map_vol = 0, protect_hidden = 0,
create_vol = 0, contain_hidden = 0, use_secure_erase = 1;
struct pbkdf_prf_algo *prf = NULL;
struct tc_cipher_chain *cipher_chain = NULL;
struct pbkdf_prf_algo *h_prf = NULL;
struct tc_cipher_chain *h_cipher_chain = NULL;

if ((error = tc_play_init()) != 0) {
fprintf(stderr, "Initialization failed, exiting.");
exit(1);
}

atexit(check_and_purge_safe_mem);
signal(SIGUSR1, sig_handler);
signal(SIGINFO, sig_handler);

nkeyfiles = 0;
n_hkeyfiles = 0;

while ((ch = getopt_long(argc, argv, "a:b:cd:ef:ghik:m:s:vx:y:z",
longopts, NULL)) != -1) {
switch(ch) {
case 'a':
if (prf != NULL)
usage();
if ((prf = check_prf_algo(optarg, 0)) == NULL) {
if (strcmp(optarg, "help") == 0)
exit(0);
else
usage();
/* NOT REACHED */
}
break;
case 'b':
if (cipher_chain != NULL)
usage();
if ((cipher_chain = check_cipher_chain(optarg, 0)) == NULL) {
if (strcmp(optarg, "help") == 0)
exit(0);
else
usage();
/* NOT REACHED */
}
break;
case 'c':
create_vol = 1;
break;
case 'd':
dev = optarg;
break;
case 'e':
protect_hidden = 1;
break;
case 'f':
h_keyfiles[n_hkeyfiles++] = optarg;
break;
case 'g':
contain_hidden = 1;
break;
case 'i':
info_vol = 1;
break;
case 'k':
keyfiles[nkeyfiles++] = optarg;
break;
case 'm':
map_vol = 1;
map_name = optarg;
break;
case 's':
sflag = 1;
sys_dev = optarg;
break;
case 'v':
printf("tcplay v%d.%d\n", MAJ_VER, MIN_VER);
exit(0);
/* NOT REACHED */
case 'x':
if (h_prf != NULL)
usage();
if ((h_prf = check_prf_algo(optarg, 0)) == NULL) {
if (strcmp(optarg, "help") == 0)
exit(0);
else
usage();
/* NOT REACHED */
}
break;
case 'y':
if (h_cipher_chain != NULL)
usage();
if ((h_cipher_chain = check_cipher_chain(optarg, 0)) == NULL) {
if (strcmp(optarg, "help") == 0)
exit(0);
else
usage();
/* NOT REACHED */
}
break;

case 'z':
use_secure_erase = 0;
break;
case 'h':
case '?':
default:
usage();
/* NOT REACHED */
}
}

argc -= optind;
argv += optind;

/* Check arguments */
if (!((map_vol || info_vol || create_vol) && dev != NULL) ||
(map_vol && info_vol) ||
(map_vol && create_vol) ||
(create_vol && info_vol) ||
(contain_hidden && !create_vol) ||
(sflag && (sys_dev == NULL)) ||
(map_vol && (map_name == NULL)) ||
(!(protect_hidden || create_vol) && n_hkeyfiles > 0)) {
usage();
/* NOT REACHED */
}

/* Create a new volume */
if (create_vol) {
error = create_volume(dev, contain_hidden, keyfiles, nkeyfiles,
h_keyfiles, n_hkeyfiles, prf, cipher_chain, h_prf,
h_cipher_chain, NULL, NULL,
0, 1 /* interactive */,
use_secure_erase);
if (error) {
tc_log(1, "could not create new volume on %s\n", dev);
}
} else if (info_vol) {
error = info_volume(dev, sflag, sys_dev, protect_hidden,
keyfiles, nkeyfiles, h_keyfiles, n_hkeyfiles, NULL, NULL,
1 /* interactive */, DEFAULT_RETRIES, 0);
} else if (map_vol) {
error = map_volume(map_name,
dev, sflag, sys_dev, protect_hidden,
keyfiles, nkeyfiles, h_keyfiles, n_hkeyfiles, NULL, NULL,
1 /* interactive */, DEFAULT_RETRIES, 0);
}

return error;
}
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