| 1 | /* |
| 2 | * Stand-alone tool to access the Puzzles obfuscation algorithm. |
| 3 | * |
| 4 | * To deobfuscate, use "obfusc -d": |
| 5 | * |
| 6 | * obfusc -d reads binary data from stdin, writes to stdout |
| 7 | * obfusc -d <hex string> works on the given hex string instead of stdin |
| 8 | * obfusc -d -h writes a hex string instead of binary to stdout |
| 9 | * |
| 10 | * To obfuscate, "obfusc -e": |
| 11 | * |
| 12 | * obfusc -e reads binary from stdin, writes hex to stdout |
| 13 | * obfusc -e <hex string> works on the given hex string instead of stdin |
| 14 | * obfusc -e -b writes binary instead of text to stdout |
| 15 | * |
| 16 | * The default output format is hex for -e and binary for -d |
| 17 | * because that's the way obfuscation is generally used in |
| 18 | * Puzzles. Either of -b and -h can always be specified to set it |
| 19 | * explicitly. |
| 20 | * |
| 21 | * Data read from standard input is assumed always to be binary; |
| 22 | * data provided on the command line is taken to be hex. |
| 23 | */ |
| 24 | |
| 25 | #include <stdio.h> |
| 26 | #include <stdlib.h> |
| 27 | #include <stdarg.h> |
| 28 | #include <string.h> |
| 29 | #include <errno.h> |
| 30 | |
| 31 | #include "puzzles.h" |
| 32 | |
| 33 | int main(int argc, char **argv) |
| 34 | { |
| 35 | enum { BINARY, DEFAULT, HEX } outputmode = DEFAULT; |
| 36 | char *inhex = NULL; |
| 37 | unsigned char *data; |
| 38 | int datalen; |
| 39 | int decode = -1; |
| 40 | int doing_opts = TRUE; |
| 41 | |
| 42 | while (--argc > 0) { |
| 43 | char *p = *++argv; |
| 44 | |
| 45 | if (doing_opts && *p == '-') { |
| 46 | if (!strcmp(p, "--")) { |
| 47 | doing_opts = 0; |
| 48 | continue; |
| 49 | } |
| 50 | p++; |
| 51 | while (*p) { |
| 52 | switch (*p) { |
| 53 | case 'e': |
| 54 | decode = 0; |
| 55 | break; |
| 56 | case 'd': |
| 57 | decode = 1; |
| 58 | break; |
| 59 | case 'b': |
| 60 | outputmode = BINARY; |
| 61 | break; |
| 62 | case 'h': |
| 63 | outputmode = HEX; |
| 64 | break; |
| 65 | default: |
| 66 | fprintf(stderr, "obfusc: unrecognised option '-%c'\n", |
| 67 | *p); |
| 68 | return 1; |
| 69 | } |
| 70 | p++; |
| 71 | } |
| 72 | } else { |
| 73 | if (!inhex) { |
| 74 | inhex = p; |
| 75 | } else { |
| 76 | fprintf(stderr, "obfusc: expected at most one argument\n"); |
| 77 | return 1; |
| 78 | } |
| 79 | } |
| 80 | } |
| 81 | |
| 82 | if (decode < 0) { |
| 83 | fprintf(stderr, "usage: obfusc < -e | -d > [ -b | -h ] [hex data]\n"); |
| 84 | return 0; |
| 85 | } |
| 86 | |
| 87 | if (outputmode == DEFAULT) |
| 88 | outputmode = (decode ? BINARY : HEX); |
| 89 | |
| 90 | if (inhex) { |
| 91 | datalen = strlen(inhex) / 2; |
| 92 | data = hex2bin(inhex, datalen); |
| 93 | } else { |
| 94 | int datasize = 4096; |
| 95 | datalen = 0; |
| 96 | data = snewn(datasize, unsigned char); |
| 97 | while (1) { |
| 98 | int ret = fread(data + datalen, 1, datasize - datalen, stdin); |
| 99 | if (ret < 0) { |
| 100 | fprintf(stderr, "obfusc: read: %s\n", strerror(errno)); |
| 101 | return 1; |
| 102 | } else if (ret == 0) { |
| 103 | break; |
| 104 | } else { |
| 105 | datalen += ret; |
| 106 | if (datasize - datalen < 4096) { |
| 107 | datasize = datalen * 5 / 4 + 4096; |
| 108 | data = sresize(data, datasize, unsigned char); |
| 109 | } |
| 110 | } |
| 111 | } |
| 112 | } |
| 113 | |
| 114 | obfuscate_bitmap(data, datalen * 8, decode); |
| 115 | |
| 116 | if (outputmode == BINARY) { |
| 117 | int ret = fwrite(data, 1, datalen, stdout); |
| 118 | if (ret < 0) { |
| 119 | fprintf(stderr, "obfusc: write: %s\n", strerror(errno)); |
| 120 | return 1; |
| 121 | } |
| 122 | } else { |
| 123 | int i; |
| 124 | for (i = 0; i < datalen; i++) |
| 125 | printf("%02x", data[i]); |
| 126 | printf("\n"); |
| 127 | } |
| 128 | |
| 129 | return 0; |
| 130 | } |