756 lines
22 KiB
C
756 lines
22 KiB
C
/***
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This file is part of systemd.
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Copyright 2010 Lennart Poettering
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systemd is free software; you can redistribute it and/or modify it
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under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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systemd is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with systemd; If not, see <http://www.gnu.org/licenses/>.
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***/
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#include <ctype.h>
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#include <errno.h>
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#include <stdint.h>
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#include <stdlib.h>
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#include "alloc-util.h"
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#include "hexdecoct.h"
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#include "macro.h"
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#include "util.h"
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char octchar(int x) {
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return '0' + (x & 7);
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}
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int unoctchar(char c) {
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if (c >= '0' && c <= '7')
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return c - '0';
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return -EINVAL;
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}
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char decchar(int x) {
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return '0' + (x % 10);
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}
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int undecchar(char c) {
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if (c >= '0' && c <= '9')
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return c - '0';
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return -EINVAL;
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}
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char hexchar(int x) {
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static const char table[16] = "0123456789abcdef";
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return table[x & 15];
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}
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int unhexchar(char c) {
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if (c >= '0' && c <= '9')
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return c - '0';
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if (c >= 'a' && c <= 'f')
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return c - 'a' + 10;
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if (c >= 'A' && c <= 'F')
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return c - 'A' + 10;
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return -EINVAL;
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}
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char *hexmem(const void *p, size_t l) {
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char *r, *z;
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const uint8_t *x;
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z = r = malloc(l * 2 + 1);
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if (!r)
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return NULL;
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for (x = p; x < (const uint8_t*) p + l; x++) {
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*(z++) = hexchar(*x >> 4);
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*(z++) = hexchar(*x & 15);
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}
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*z = 0;
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return r;
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}
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int unhexmem(const char *p, size_t l, void **mem, size_t *len) {
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_cleanup_free_ uint8_t *r = NULL;
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uint8_t *z;
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const char *x;
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assert(mem);
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assert(len);
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assert(p);
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if (l % 2 != 0)
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return -EINVAL;
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z = r = malloc((l + 1) / 2 + 1);
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if (!r)
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return -ENOMEM;
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for (x = p; x < p + l; x += 2) {
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int a, b;
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a = unhexchar(x[0]);
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if (a < 0)
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return a;
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b = unhexchar(x[1]);
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if (b < 0)
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return b;
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*(z++) = (uint8_t) a << 4 | (uint8_t) b;
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}
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*z = 0;
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*mem = r;
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r = NULL;
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*len = (l + 1) / 2;
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return 0;
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}
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/* https://tools.ietf.org/html/rfc4648#section-6
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* Notice that base32hex differs from base32 in the alphabet it uses.
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* The distinction is that the base32hex representation preserves the
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* order of the underlying data when compared as bytestrings, this is
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* useful when representing NSEC3 hashes, as one can then verify the
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* order of hashes directly from their representation. */
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char base32hexchar(int x) {
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static const char table[32] = "0123456789"
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"ABCDEFGHIJKLMNOPQRSTUV";
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return table[x & 31];
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}
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int unbase32hexchar(char c) {
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unsigned offset;
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if (c >= '0' && c <= '9')
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return c - '0';
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offset = '9' - '0' + 1;
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if (c >= 'A' && c <= 'V')
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return c - 'A' + offset;
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return -EINVAL;
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}
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char *base32hexmem(const void *p, size_t l, bool padding) {
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char *r, *z;
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const uint8_t *x;
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size_t len;
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if (padding)
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/* five input bytes makes eight output bytes, padding is added so we must round up */
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len = 8 * (l + 4) / 5;
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else {
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/* same, but round down as there is no padding */
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len = 8 * l / 5;
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switch (l % 5) {
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case 4:
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len += 7;
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break;
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case 3:
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len += 5;
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break;
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case 2:
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len += 4;
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break;
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case 1:
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len += 2;
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break;
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}
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}
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z = r = malloc(len + 1);
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if (!r)
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return NULL;
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for (x = p; x < (const uint8_t*) p + (l / 5) * 5; x += 5) {
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/* x[0] == XXXXXXXX; x[1] == YYYYYYYY; x[2] == ZZZZZZZZ
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x[3] == QQQQQQQQ; x[4] == WWWWWWWW */
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*(z++) = base32hexchar(x[0] >> 3); /* 000XXXXX */
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*(z++) = base32hexchar((x[0] & 7) << 2 | x[1] >> 6); /* 000XXXYY */
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*(z++) = base32hexchar((x[1] & 63) >> 1); /* 000YYYYY */
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*(z++) = base32hexchar((x[1] & 1) << 4 | x[2] >> 4); /* 000YZZZZ */
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*(z++) = base32hexchar((x[2] & 15) << 1 | x[3] >> 7); /* 000ZZZZQ */
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*(z++) = base32hexchar((x[3] & 127) >> 2); /* 000QQQQQ */
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*(z++) = base32hexchar((x[3] & 3) << 3 | x[4] >> 5); /* 000QQWWW */
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*(z++) = base32hexchar((x[4] & 31)); /* 000WWWWW */
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}
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switch (l % 5) {
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case 4:
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*(z++) = base32hexchar(x[0] >> 3); /* 000XXXXX */
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*(z++) = base32hexchar((x[0] & 7) << 2 | x[1] >> 6); /* 000XXXYY */
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*(z++) = base32hexchar((x[1] & 63) >> 1); /* 000YYYYY */
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*(z++) = base32hexchar((x[1] & 1) << 4 | x[2] >> 4); /* 000YZZZZ */
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*(z++) = base32hexchar((x[2] & 15) << 1 | x[3] >> 7); /* 000ZZZZQ */
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*(z++) = base32hexchar((x[3] & 127) >> 2); /* 000QQQQQ */
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*(z++) = base32hexchar((x[3] & 3) << 3); /* 000QQ000 */
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if (padding)
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*(z++) = '=';
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break;
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case 3:
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*(z++) = base32hexchar(x[0] >> 3); /* 000XXXXX */
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*(z++) = base32hexchar((x[0] & 7) << 2 | x[1] >> 6); /* 000XXXYY */
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*(z++) = base32hexchar((x[1] & 63) >> 1); /* 000YYYYY */
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*(z++) = base32hexchar((x[1] & 1) << 4 | x[2] >> 4); /* 000YZZZZ */
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*(z++) = base32hexchar((x[2] & 15) << 1); /* 000ZZZZ0 */
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if (padding) {
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*(z++) = '=';
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*(z++) = '=';
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*(z++) = '=';
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}
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break;
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case 2:
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*(z++) = base32hexchar(x[0] >> 3); /* 000XXXXX */
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*(z++) = base32hexchar((x[0] & 7) << 2 | x[1] >> 6); /* 000XXXYY */
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*(z++) = base32hexchar((x[1] & 63) >> 1); /* 000YYYYY */
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*(z++) = base32hexchar((x[1] & 1) << 4); /* 000Y0000 */
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if (padding) {
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*(z++) = '=';
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*(z++) = '=';
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*(z++) = '=';
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*(z++) = '=';
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}
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break;
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case 1:
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*(z++) = base32hexchar(x[0] >> 3); /* 000XXXXX */
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*(z++) = base32hexchar((x[0] & 7) << 2); /* 000XXX00 */
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if (padding) {
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*(z++) = '=';
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*(z++) = '=';
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*(z++) = '=';
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*(z++) = '=';
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*(z++) = '=';
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*(z++) = '=';
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}
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break;
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}
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*z = 0;
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return r;
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}
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int unbase32hexmem(const char *p, size_t l, bool padding, void **mem, size_t *_len) {
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_cleanup_free_ uint8_t *r = NULL;
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int a, b, c, d, e, f, g, h;
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uint8_t *z;
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const char *x;
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size_t len;
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unsigned pad = 0;
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assert(p);
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/* padding ensures any base32hex input has input divisible by 8 */
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if (padding && l % 8 != 0)
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return -EINVAL;
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if (padding) {
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/* strip the padding */
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while (l > 0 && p[l - 1] == '=' && pad < 7) {
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pad++;
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l--;
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}
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}
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/* a group of eight input bytes needs five output bytes, in case of
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padding we need to add some extra bytes */
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len = (l / 8) * 5;
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switch (l % 8) {
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case 7:
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len += 4;
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break;
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case 5:
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len += 3;
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break;
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case 4:
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len += 2;
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break;
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case 2:
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len += 1;
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break;
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case 0:
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break;
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default:
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return -EINVAL;
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}
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z = r = malloc(len + 1);
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if (!r)
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return -ENOMEM;
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for (x = p; x < p + (l / 8) * 8; x += 8) {
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/* a == 000XXXXX; b == 000YYYYY; c == 000ZZZZZ; d == 000WWWWW
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e == 000SSSSS; f == 000QQQQQ; g == 000VVVVV; h == 000RRRRR */
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a = unbase32hexchar(x[0]);
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if (a < 0)
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return -EINVAL;
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b = unbase32hexchar(x[1]);
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if (b < 0)
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return -EINVAL;
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c = unbase32hexchar(x[2]);
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if (c < 0)
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return -EINVAL;
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d = unbase32hexchar(x[3]);
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if (d < 0)
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return -EINVAL;
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e = unbase32hexchar(x[4]);
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if (e < 0)
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return -EINVAL;
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f = unbase32hexchar(x[5]);
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if (f < 0)
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return -EINVAL;
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g = unbase32hexchar(x[6]);
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if (g < 0)
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return -EINVAL;
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h = unbase32hexchar(x[7]);
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if (h < 0)
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return -EINVAL;
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*(z++) = (uint8_t) a << 3 | (uint8_t) b >> 2; /* XXXXXYYY */
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*(z++) = (uint8_t) b << 6 | (uint8_t) c << 1 | (uint8_t) d >> 4; /* YYZZZZZW */
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*(z++) = (uint8_t) d << 4 | (uint8_t) e >> 1; /* WWWWSSSS */
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*(z++) = (uint8_t) e << 7 | (uint8_t) f << 2 | (uint8_t) g >> 3; /* SQQQQQVV */
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*(z++) = (uint8_t) g << 5 | (uint8_t) h; /* VVVRRRRR */
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}
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switch (l % 8) {
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case 7:
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a = unbase32hexchar(x[0]);
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if (a < 0)
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return -EINVAL;
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b = unbase32hexchar(x[1]);
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if (b < 0)
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return -EINVAL;
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c = unbase32hexchar(x[2]);
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if (c < 0)
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return -EINVAL;
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d = unbase32hexchar(x[3]);
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if (d < 0)
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return -EINVAL;
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e = unbase32hexchar(x[4]);
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if (e < 0)
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return -EINVAL;
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f = unbase32hexchar(x[5]);
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if (f < 0)
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return -EINVAL;
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g = unbase32hexchar(x[6]);
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if (g < 0)
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return -EINVAL;
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/* g == 000VV000 */
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if (g & 7)
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return -EINVAL;
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*(z++) = (uint8_t) a << 3 | (uint8_t) b >> 2; /* XXXXXYYY */
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*(z++) = (uint8_t) b << 6 | (uint8_t) c << 1 | (uint8_t) d >> 4; /* YYZZZZZW */
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*(z++) = (uint8_t) d << 4 | (uint8_t) e >> 1; /* WWWWSSSS */
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*(z++) = (uint8_t) e << 7 | (uint8_t) f << 2 | (uint8_t) g >> 3; /* SQQQQQVV */
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break;
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case 5:
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a = unbase32hexchar(x[0]);
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if (a < 0)
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return -EINVAL;
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b = unbase32hexchar(x[1]);
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if (b < 0)
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return -EINVAL;
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c = unbase32hexchar(x[2]);
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if (c < 0)
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return -EINVAL;
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d = unbase32hexchar(x[3]);
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if (d < 0)
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return -EINVAL;
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e = unbase32hexchar(x[4]);
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if (e < 0)
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return -EINVAL;
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/* e == 000SSSS0 */
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if (e & 1)
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return -EINVAL;
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*(z++) = (uint8_t) a << 3 | (uint8_t) b >> 2; /* XXXXXYYY */
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*(z++) = (uint8_t) b << 6 | (uint8_t) c << 1 | (uint8_t) d >> 4; /* YYZZZZZW */
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*(z++) = (uint8_t) d << 4 | (uint8_t) e >> 1; /* WWWWSSSS */
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break;
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case 4:
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a = unbase32hexchar(x[0]);
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if (a < 0)
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return -EINVAL;
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b = unbase32hexchar(x[1]);
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if (b < 0)
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return -EINVAL;
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c = unbase32hexchar(x[2]);
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if (c < 0)
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return -EINVAL;
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d = unbase32hexchar(x[3]);
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if (d < 0)
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return -EINVAL;
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/* d == 000W0000 */
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if (d & 15)
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return -EINVAL;
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*(z++) = (uint8_t) a << 3 | (uint8_t) b >> 2; /* XXXXXYYY */
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*(z++) = (uint8_t) b << 6 | (uint8_t) c << 1 | (uint8_t) d >> 4; /* YYZZZZZW */
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break;
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case 2:
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a = unbase32hexchar(x[0]);
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if (a < 0)
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return -EINVAL;
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b = unbase32hexchar(x[1]);
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if (b < 0)
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return -EINVAL;
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/* b == 000YYY00 */
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if (b & 3)
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return -EINVAL;
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*(z++) = (uint8_t) a << 3 | (uint8_t) b >> 2; /* XXXXXYYY */
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break;
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case 0:
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break;
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default:
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return -EINVAL;
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}
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*z = 0;
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*mem = r;
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r = NULL;
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*_len = len;
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return 0;
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}
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/* https://tools.ietf.org/html/rfc4648#section-4 */
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char base64char(int x) {
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static const char table[64] = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
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"abcdefghijklmnopqrstuvwxyz"
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"0123456789+/";
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return table[x & 63];
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}
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int unbase64char(char c) {
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unsigned offset;
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if (c >= 'A' && c <= 'Z')
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return c - 'A';
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offset = 'Z' - 'A' + 1;
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if (c >= 'a' && c <= 'z')
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return c - 'a' + offset;
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offset += 'z' - 'a' + 1;
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if (c >= '0' && c <= '9')
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return c - '0' + offset;
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offset += '9' - '0' + 1;
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if (c == '+')
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return offset;
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offset++;
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if (c == '/')
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return offset;
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return -EINVAL;
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}
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ssize_t base64mem(const void *p, size_t l, char **out) {
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char *r, *z;
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const uint8_t *x;
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/* three input bytes makes four output bytes, padding is added so we must round up */
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z = r = malloc(4 * (l + 2) / 3 + 1);
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if (!r)
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return -ENOMEM;
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for (x = p; x < (const uint8_t*) p + (l / 3) * 3; x += 3) {
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/* x[0] == XXXXXXXX; x[1] == YYYYYYYY; x[2] == ZZZZZZZZ */
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*(z++) = base64char(x[0] >> 2); /* 00XXXXXX */
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*(z++) = base64char((x[0] & 3) << 4 | x[1] >> 4); /* 00XXYYYY */
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*(z++) = base64char((x[1] & 15) << 2 | x[2] >> 6); /* 00YYYYZZ */
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*(z++) = base64char(x[2] & 63); /* 00ZZZZZZ */
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}
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switch (l % 3) {
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case 2:
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*(z++) = base64char(x[0] >> 2); /* 00XXXXXX */
|
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*(z++) = base64char((x[0] & 3) << 4 | x[1] >> 4); /* 00XXYYYY */
|
|
*(z++) = base64char((x[1] & 15) << 2); /* 00YYYY00 */
|
|
*(z++) = '=';
|
|
|
|
break;
|
|
case 1:
|
|
*(z++) = base64char(x[0] >> 2); /* 00XXXXXX */
|
|
*(z++) = base64char((x[0] & 3) << 4); /* 00XX0000 */
|
|
*(z++) = '=';
|
|
*(z++) = '=';
|
|
|
|
break;
|
|
}
|
|
|
|
*z = 0;
|
|
*out = r;
|
|
return z - r;
|
|
}
|
|
|
|
static int base64_append_width(char **prefix, int plen,
|
|
const char *sep, int indent,
|
|
const void *p, size_t l,
|
|
int width) {
|
|
|
|
_cleanup_free_ char *x = NULL;
|
|
char *t, *s;
|
|
ssize_t slen, len, avail;
|
|
int line, lines;
|
|
|
|
len = base64mem(p, l, &x);
|
|
if (len <= 0)
|
|
return len;
|
|
|
|
lines = (len + width - 1) / width;
|
|
|
|
slen = sep ? strlen(sep) : 0;
|
|
t = realloc(*prefix, plen + 1 + slen + (indent + width + 1) * lines);
|
|
if (!t)
|
|
return -ENOMEM;
|
|
|
|
memcpy_safe(t + plen, sep, slen);
|
|
|
|
for (line = 0, s = t + plen + slen, avail = len; line < lines; line++) {
|
|
int act = MIN(width, avail);
|
|
|
|
if (line > 0 || sep) {
|
|
memset(s, ' ', indent);
|
|
s += indent;
|
|
}
|
|
|
|
memcpy(s, x + width * line, act);
|
|
s += act;
|
|
*(s++) = line < lines - 1 ? '\n' : '\0';
|
|
avail -= act;
|
|
}
|
|
assert(avail == 0);
|
|
|
|
*prefix = t;
|
|
return 0;
|
|
}
|
|
|
|
int base64_append(char **prefix, int plen,
|
|
const void *p, size_t l,
|
|
int indent, int width) {
|
|
if (plen > width / 2 || plen + indent > width)
|
|
/* leave indent on the left, keep last column free */
|
|
return base64_append_width(prefix, plen, "\n", indent, p, l, width - indent - 1);
|
|
else
|
|
/* leave plen on the left, keep last column free */
|
|
return base64_append_width(prefix, plen, NULL, plen, p, l, width - plen - 1);
|
|
};
|
|
|
|
|
|
int unbase64mem(const char *p, size_t l, void **mem, size_t *_len) {
|
|
_cleanup_free_ uint8_t *r = NULL;
|
|
int a, b, c, d;
|
|
uint8_t *z;
|
|
const char *x;
|
|
size_t len;
|
|
|
|
assert(p);
|
|
|
|
/* padding ensures any base63 input has input divisible by 4 */
|
|
if (l % 4 != 0)
|
|
return -EINVAL;
|
|
|
|
/* strip the padding */
|
|
if (l > 0 && p[l - 1] == '=')
|
|
l--;
|
|
if (l > 0 && p[l - 1] == '=')
|
|
l--;
|
|
|
|
/* a group of four input bytes needs three output bytes, in case of
|
|
padding we need to add two or three extra bytes */
|
|
len = (l / 4) * 3 + (l % 4 ? (l % 4) - 1 : 0);
|
|
|
|
z = r = malloc(len + 1);
|
|
if (!r)
|
|
return -ENOMEM;
|
|
|
|
for (x = p; x < p + (l / 4) * 4; x += 4) {
|
|
/* a == 00XXXXXX; b == 00YYYYYY; c == 00ZZZZZZ; d == 00WWWWWW */
|
|
a = unbase64char(x[0]);
|
|
if (a < 0)
|
|
return -EINVAL;
|
|
|
|
b = unbase64char(x[1]);
|
|
if (b < 0)
|
|
return -EINVAL;
|
|
|
|
c = unbase64char(x[2]);
|
|
if (c < 0)
|
|
return -EINVAL;
|
|
|
|
d = unbase64char(x[3]);
|
|
if (d < 0)
|
|
return -EINVAL;
|
|
|
|
*(z++) = (uint8_t) a << 2 | (uint8_t) b >> 4; /* XXXXXXYY */
|
|
*(z++) = (uint8_t) b << 4 | (uint8_t) c >> 2; /* YYYYZZZZ */
|
|
*(z++) = (uint8_t) c << 6 | (uint8_t) d; /* ZZWWWWWW */
|
|
}
|
|
|
|
switch (l % 4) {
|
|
case 3:
|
|
a = unbase64char(x[0]);
|
|
if (a < 0)
|
|
return -EINVAL;
|
|
|
|
b = unbase64char(x[1]);
|
|
if (b < 0)
|
|
return -EINVAL;
|
|
|
|
c = unbase64char(x[2]);
|
|
if (c < 0)
|
|
return -EINVAL;
|
|
|
|
/* c == 00ZZZZ00 */
|
|
if (c & 3)
|
|
return -EINVAL;
|
|
|
|
*(z++) = (uint8_t) a << 2 | (uint8_t) b >> 4; /* XXXXXXYY */
|
|
*(z++) = (uint8_t) b << 4 | (uint8_t) c >> 2; /* YYYYZZZZ */
|
|
|
|
break;
|
|
case 2:
|
|
a = unbase64char(x[0]);
|
|
if (a < 0)
|
|
return -EINVAL;
|
|
|
|
b = unbase64char(x[1]);
|
|
if (b < 0)
|
|
return -EINVAL;
|
|
|
|
/* b == 00YY0000 */
|
|
if (b & 15)
|
|
return -EINVAL;
|
|
|
|
*(z++) = (uint8_t) a << 2 | (uint8_t) (b >> 4); /* XXXXXXYY */
|
|
|
|
break;
|
|
case 0:
|
|
|
|
break;
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
|
|
*z = 0;
|
|
|
|
*mem = r;
|
|
r = NULL;
|
|
*_len = len;
|
|
|
|
return 0;
|
|
}
|
|
|
|
void hexdump(FILE *f, const void *p, size_t s) {
|
|
const uint8_t *b = p;
|
|
unsigned n = 0;
|
|
|
|
assert(s == 0 || b);
|
|
|
|
while (s > 0) {
|
|
size_t i;
|
|
|
|
fprintf(f, "%04x ", n);
|
|
|
|
for (i = 0; i < 16; i++) {
|
|
|
|
if (i >= s)
|
|
fputs(" ", f);
|
|
else
|
|
fprintf(f, "%02x ", b[i]);
|
|
|
|
if (i == 7)
|
|
fputc(' ', f);
|
|
}
|
|
|
|
fputc(' ', f);
|
|
|
|
for (i = 0; i < 16; i++) {
|
|
|
|
if (i >= s)
|
|
fputc(' ', f);
|
|
else
|
|
fputc(isprint(b[i]) ? (char) b[i] : '.', f);
|
|
}
|
|
|
|
fputc('\n', f);
|
|
|
|
if (s < 16)
|
|
break;
|
|
|
|
n += 16;
|
|
b += 16;
|
|
s -= 16;
|
|
}
|
|
}
|