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/*
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* Copyright (C) 2009-2011 Gabor Juhos <juhosg@openwrt.org> |
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* |
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* This program is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 as published |
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* by the Free Software Foundation. |
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* |
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*/ |
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#include <stdio.h> |
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#include <stdlib.h> |
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#include <stdint.h> |
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#include <string.h> |
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#include <libgen.h> |
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#include <getopt.h> /* for getopt() */ |
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#include <stdarg.h> |
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#include "buffalo-lib.h" |
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#define ERR(fmt, args...) do { \ |
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fflush(0); \
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fprintf(stderr, "[%s] *** error: " fmt "\n", \
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progname, ## args ); \
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} while (0) |
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static char *progname; |
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static char *ifname; |
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static char *ofname; |
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static int do_decrypt; |
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void usage(int status) |
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{ |
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FILE *stream = (status != EXIT_SUCCESS) ? stderr : stdout; |
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fprintf(stream, "Usage: %s [OPTIONS...]\n", progname); |
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fprintf(stream, |
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"\n" |
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"Options:\n" |
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" -d decrypt instead of encrypt\n" |
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" -i <file> read input from the file <file>\n" |
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" -o <file> write output to the file <file>\n" |
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" -h show this screen\n" |
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); |
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exit(status); |
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} |
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static const unsigned char *crypt_key1 = (unsigned char *) |
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"abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789"; |
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static const unsigned char *crypt_key2 = (unsigned char *) |
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"XYZ0123hijklmnopqABCDEFGHrstuvabcdefgwxyzIJKLMSTUVW456789NOPQR"; |
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static void crypt_header(unsigned char *buf, ssize_t len, |
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const unsigned char *key1, const unsigned char *key2) |
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{ |
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ssize_t i; |
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for (i = 0; i < len; i++) { |
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unsigned int j; |
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for (j = 0; key1[j]; j++) |
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if (buf[i] == key1[j]) { |
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buf[i] = key2[j]; |
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break; |
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} |
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} |
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} |
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static int crypt_file(void) |
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{ |
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unsigned char *buf = NULL; |
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ssize_t src_len; |
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ssize_t crypt_len; |
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int err; |
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int ret = -1; |
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src_len = get_file_size(ifname); |
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if (src_len < 0) { |
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ERR("unable to get size of '%s'", ifname); |
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goto out; |
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} |
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buf = malloc(src_len); |
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if (buf == NULL) { |
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ERR("no memory for the buffer"); |
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goto out; |
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} |
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err = read_file_to_buf(ifname, buf, src_len); |
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if (err) { |
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ERR("unable to read from file '%s'", ifname); |
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goto out; |
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} |
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crypt_len = (src_len > 512) ? 512 : src_len; |
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if (do_decrypt) |
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crypt_header(buf, 512, crypt_key2, crypt_key1); |
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else |
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crypt_header(buf, 512, crypt_key1, crypt_key2); |
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err = write_buf_to_file(ofname, buf, src_len); |
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if (err) { |
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ERR("unable to write to file '%s'", ofname); |
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goto out; |
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} |
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ret = 0; |
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out: |
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free(buf); |
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return ret; |
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} |
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static int check_params(void) |
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{ |
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int ret = -1; |
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if (ifname == NULL) { |
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ERR("no input file specified"); |
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goto out; |
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} |
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if (ofname == NULL) { |
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ERR("no output file specified"); |
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goto out; |
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} |
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ret = 0; |
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out: |
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return ret; |
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} |
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int main(int argc, char *argv[]) |
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{ |
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int res = EXIT_FAILURE; |
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int err; |
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progname = basename(argv[0]); |
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while ( 1 ) { |
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int c; |
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c = getopt(argc, argv, "di:o:h"); |
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if (c == -1) |
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break; |
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switch (c) { |
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case 'd': |
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do_decrypt = 1; |
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break; |
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case 'i': |
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ifname = optarg; |
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break; |
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case 'o': |
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ofname = optarg; |
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break; |
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case 'h': |
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usage(EXIT_SUCCESS); |
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break; |
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default: |
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usage(EXIT_FAILURE); |
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break; |
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} |
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} |
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err = check_params(); |
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if (err) |
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goto out; |
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err = crypt_file(); |
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if (err) |
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goto out; |
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res = EXIT_SUCCESS; |
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out: |
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return res; |
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} |
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