resolve: move dns routines into shared
This commit is contained in:
Nick Owens
@@ -0,0 +1,613 @@
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/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
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/***
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This file is part of systemd.
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Copyright 2014 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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#ifdef HAVE_LIBIDN
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#include <idna.h>
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#include <stringprep.h>
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#endif
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#include "dns-domain.h"
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int dns_label_unescape(const char **name, char *dest, size_t sz) {
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const char *n;
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char *d;
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int r = 0;
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assert(name);
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assert(*name);
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assert(dest);
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n = *name;
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d = dest;
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for (;;) {
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if (*n == '.') {
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n++;
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break;
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}
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if (*n == 0)
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break;
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if (sz <= 0)
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return -ENOSPC;
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if (r >= DNS_LABEL_MAX)
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return -EINVAL;
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if (*n == '\\') {
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/* Escaped character */
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n++;
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if (*n == 0)
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/* Ending NUL */
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return -EINVAL;
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else if (*n == '\\' || *n == '.') {
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/* Escaped backslash or dot */
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*(d++) = *(n++);
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sz--;
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r++;
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} else if (n[0] >= '0' && n[0] <= '9') {
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unsigned k;
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/* Escaped literal ASCII character */
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if (!(n[1] >= '0' && n[1] <= '9') ||
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!(n[2] >= '0' && n[2] <= '9'))
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return -EINVAL;
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k = ((unsigned) (n[0] - '0') * 100) +
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((unsigned) (n[1] - '0') * 10) +
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((unsigned) (n[2] - '0'));
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/* Don't allow CC characters or anything that doesn't fit in 8bit */
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if (k < ' ' || k > 255 || k == 127)
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return -EINVAL;
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*(d++) = (char) k;
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sz--;
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r++;
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n += 3;
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} else
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return -EINVAL;
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} else if ((uint8_t) *n >= (uint8_t) ' ' && *n != 127) {
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/* Normal character */
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*(d++) = *(n++);
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sz--;
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r++;
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} else
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return -EINVAL;
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}
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/* Empty label that is not at the end? */
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if (r == 0 && *n)
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return -EINVAL;
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if (sz >= 1)
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*d = 0;
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*name = n;
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return r;
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}
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int dns_label_escape(const char *p, size_t l, char **ret) {
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_cleanup_free_ char *s = NULL;
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char *q;
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int r;
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assert(p);
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assert(ret);
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if (l > DNS_LABEL_MAX)
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return -EINVAL;
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s = malloc(l * 4 + 1);
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if (!s)
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return -ENOMEM;
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q = s;
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while (l > 0) {
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if (*p == '.' || *p == '\\') {
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/* Dot or backslash */
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*(q++) = '\\';
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*(q++) = *p;
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} else if (*p == '_' ||
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*p == '-' ||
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(*p >= '0' && *p <= '9') ||
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(*p >= 'a' && *p <= 'z') ||
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(*p >= 'A' && *p <= 'Z')) {
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/* Proper character */
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*(q++) = *p;
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} else if ((uint8_t) *p >= (uint8_t) ' ' && *p != 127) {
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/* Everything else */
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*(q++) = '\\';
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*(q++) = '0' + (char) ((uint8_t) *p / 100);
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*(q++) = '0' + (char) (((uint8_t) *p / 10) % 10);
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*(q++) = '0' + (char) ((uint8_t) *p % 10);
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} else
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return -EINVAL;
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p++;
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l--;
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}
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*q = 0;
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*ret = s;
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r = q - s;
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s = NULL;
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return r;
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}
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int dns_label_apply_idna(const char *encoded, size_t encoded_size, char *decoded, size_t decoded_max) {
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#ifdef HAVE_LIBIDN
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_cleanup_free_ uint32_t *input = NULL;
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size_t input_size;
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const char *p;
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bool contains_8bit = false;
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assert(encoded);
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assert(decoded);
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assert(decoded_max >= DNS_LABEL_MAX);
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if (encoded_size <= 0)
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return 0;
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for (p = encoded; p < encoded + encoded_size; p++)
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if ((uint8_t) *p > 127)
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contains_8bit = true;
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if (!contains_8bit)
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return 0;
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input = stringprep_utf8_to_ucs4(encoded, encoded_size, &input_size);
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if (!input)
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return -ENOMEM;
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if (idna_to_ascii_4i(input, input_size, decoded, 0) != 0)
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return -EINVAL;
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return strlen(decoded);
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#else
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return 0;
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#endif
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}
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int dns_label_undo_idna(const char *encoded, size_t encoded_size, char *decoded, size_t decoded_max) {
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#ifdef HAVE_LIBIDN
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size_t input_size, output_size;
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_cleanup_free_ uint32_t *input = NULL;
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_cleanup_free_ char *result = NULL;
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uint32_t *output = NULL;
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size_t w;
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/* To be invoked after unescaping */
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assert(encoded);
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assert(decoded);
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if (encoded_size < sizeof(IDNA_ACE_PREFIX)-1)
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return 0;
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if (memcmp(encoded, IDNA_ACE_PREFIX, sizeof(IDNA_ACE_PREFIX) -1) != 0)
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return 0;
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input = stringprep_utf8_to_ucs4(encoded, encoded_size, &input_size);
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if (!input)
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return -ENOMEM;
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output_size = input_size;
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output = newa(uint32_t, output_size);
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idna_to_unicode_44i(input, input_size, output, &output_size, 0);
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result = stringprep_ucs4_to_utf8(output, output_size, NULL, &w);
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if (!result)
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return -ENOMEM;
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if (w <= 0)
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return 0;
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if (w+1 > decoded_max)
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return -EINVAL;
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memcpy(decoded, result, w+1);
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return w;
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#else
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return 0;
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#endif
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}
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int dns_name_normalize(const char *s, char **_ret) {
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_cleanup_free_ char *ret = NULL;
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size_t n = 0, allocated = 0;
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const char *p = s;
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bool first = true;
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int r;
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assert(s);
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for (;;) {
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_cleanup_free_ char *t = NULL;
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char label[DNS_LABEL_MAX];
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int k;
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r = dns_label_unescape(&p, label, sizeof(label));
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if (r < 0)
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return r;
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if (r == 0) {
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if (*p != 0)
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return -EINVAL;
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break;
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}
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k = dns_label_undo_idna(label, r, label, sizeof(label));
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if (k < 0)
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return k;
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if (k > 0)
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r = k;
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r = dns_label_escape(label, r, &t);
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if (r < 0)
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return r;
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if (!GREEDY_REALLOC(ret, allocated, n + !first + strlen(t) + 1))
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return -ENOMEM;
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if (!first)
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ret[n++] = '.';
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else
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first = false;
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memcpy(ret + n, t, r);
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n += r;
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}
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if (n > DNS_NAME_MAX)
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return -EINVAL;
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if (!GREEDY_REALLOC(ret, allocated, n + 1))
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return -ENOMEM;
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ret[n] = 0;
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if (_ret) {
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*_ret = ret;
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ret = NULL;
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}
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return 0;
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}
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unsigned long dns_name_hash_func(const void *s, const uint8_t hash_key[HASH_KEY_SIZE]) {
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const char *p = s;
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unsigned long ul = hash_key[0];
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int r;
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assert(p);
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while (*p) {
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char label[DNS_LABEL_MAX+1];
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int k;
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r = dns_label_unescape(&p, label, sizeof(label));
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if (r < 0)
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break;
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k = dns_label_undo_idna(label, r, label, sizeof(label));
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if (k < 0)
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break;
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if (k > 0)
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r = k;
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label[r] = 0;
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ascii_strlower(label);
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ul = ul * hash_key[1] + ul + string_hash_func(label, hash_key);
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}
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return ul;
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}
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int dns_name_compare_func(const void *a, const void *b) {
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const char *x = a, *y = b;
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int r, q, k, w;
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assert(a);
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assert(b);
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for (;;) {
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char la[DNS_LABEL_MAX+1], lb[DNS_LABEL_MAX+1];
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if (*x == 0 && *y == 0)
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return 0;
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r = dns_label_unescape(&x, la, sizeof(la));
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q = dns_label_unescape(&y, lb, sizeof(lb));
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if (r < 0 || q < 0)
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return r - q;
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k = dns_label_undo_idna(la, r, la, sizeof(la));
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w = dns_label_undo_idna(lb, q, lb, sizeof(lb));
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if (k < 0 || w < 0)
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return k - w;
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if (k > 0)
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r = k;
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if (w > 0)
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r = w;
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la[r] = lb[q] = 0;
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r = strcasecmp(la, lb);
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if (r != 0)
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return r;
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}
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}
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const struct hash_ops dns_name_hash_ops = {
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.hash = dns_name_hash_func,
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.compare = dns_name_compare_func
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};
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int dns_name_equal(const char *x, const char *y) {
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int r, q, k, w;
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assert(x);
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assert(y);
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for (;;) {
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char la[DNS_LABEL_MAX+1], lb[DNS_LABEL_MAX+1];
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if (*x == 0 && *y == 0)
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return true;
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r = dns_label_unescape(&x, la, sizeof(la));
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if (r < 0)
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return r;
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k = dns_label_undo_idna(la, r, la, sizeof(la));
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if (k < 0)
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return k;
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if (k > 0)
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r = k;
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q = dns_label_unescape(&y, lb, sizeof(lb));
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if (q < 0)
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return q;
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w = dns_label_undo_idna(lb, q, lb, sizeof(lb));
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if (w < 0)
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return w;
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if (w > 0)
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q = w;
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la[r] = lb[q] = 0;
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if (strcasecmp(la, lb))
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return false;
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}
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}
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int dns_name_endswith(const char *name, const char *suffix) {
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const char *n, *s, *saved_n = NULL;
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int r, q, k, w;
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assert(name);
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assert(suffix);
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n = name;
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s = suffix;
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for (;;) {
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char ln[DNS_LABEL_MAX+1], ls[DNS_LABEL_MAX+1];
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r = dns_label_unescape(&n, ln, sizeof(ln));
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if (r < 0)
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return r;
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k = dns_label_undo_idna(ln, r, ln, sizeof(ln));
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if (k < 0)
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return k;
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if (k > 0)
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r = k;
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if (!saved_n)
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saved_n = n;
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q = dns_label_unescape(&s, ls, sizeof(ls));
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if (q < 0)
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return q;
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w = dns_label_undo_idna(ls, q, ls, sizeof(ls));
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if (w < 0)
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return w;
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if (w > 0)
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q = w;
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if (r == 0 && q == 0)
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return true;
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if (r == 0 && saved_n == n)
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return false;
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ln[r] = ls[q] = 0;
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if (r != q || strcasecmp(ln, ls)) {
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/* Not the same, let's jump back, and try with the next label again */
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s = suffix;
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n = saved_n;
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saved_n = NULL;
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}
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}
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}
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int dns_name_reverse(int family, const union in_addr_union *a, char **ret) {
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const uint8_t *p;
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int r;
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assert(a);
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assert(ret);
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p = (const uint8_t*) a;
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if (family == AF_INET)
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r = asprintf(ret, "%u.%u.%u.%u.in-addr.arpa", p[3], p[2], p[1], p[0]);
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else if (family == AF_INET6)
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r = asprintf(ret, "%c.%c.%c.%c.%c.%c.%c.%c.%c.%c.%c.%c.%c.%c.%c.%c.%c.%c.%c.%c.%c.%c.%c.%c.%c.%c.%c.%c.%c.%c.%c.%c.ip6.arpa",
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hexchar(p[15] & 0xF), hexchar(p[15] >> 4), hexchar(p[14] & 0xF), hexchar(p[14] >> 4),
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hexchar(p[13] & 0xF), hexchar(p[13] >> 4), hexchar(p[12] & 0xF), hexchar(p[12] >> 4),
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hexchar(p[11] & 0xF), hexchar(p[11] >> 4), hexchar(p[10] & 0xF), hexchar(p[10] >> 4),
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hexchar(p[ 9] & 0xF), hexchar(p[ 9] >> 4), hexchar(p[ 8] & 0xF), hexchar(p[ 8] >> 4),
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hexchar(p[ 7] & 0xF), hexchar(p[ 7] >> 4), hexchar(p[ 6] & 0xF), hexchar(p[ 6] >> 4),
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hexchar(p[ 5] & 0xF), hexchar(p[ 5] >> 4), hexchar(p[ 4] & 0xF), hexchar(p[ 4] >> 4),
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hexchar(p[ 3] & 0xF), hexchar(p[ 3] >> 4), hexchar(p[ 2] & 0xF), hexchar(p[ 2] >> 4),
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hexchar(p[ 1] & 0xF), hexchar(p[ 1] >> 4), hexchar(p[ 0] & 0xF), hexchar(p[ 0] >> 4));
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else
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return -EAFNOSUPPORT;
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if (r < 0)
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return -ENOMEM;
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return 0;
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}
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int dns_name_address(const char *p, int *family, union in_addr_union *address) {
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int r;
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assert(p);
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assert(family);
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assert(address);
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||||
|
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r = dns_name_endswith(p, "in-addr.arpa");
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if (r < 0)
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return r;
|
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if (r > 0) {
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uint8_t a[4];
|
||||
unsigned i;
|
||||
|
||||
for (i = 0; i < ELEMENTSOF(a); i++) {
|
||||
char label[DNS_LABEL_MAX+1];
|
||||
|
||||
r = dns_label_unescape(&p, label, sizeof(label));
|
||||
if (r < 0)
|
||||
return r;
|
||||
if (r == 0)
|
||||
return -EINVAL;
|
||||
if (r > 3)
|
||||
return -EINVAL;
|
||||
|
||||
r = safe_atou8(label, &a[i]);
|
||||
if (r < 0)
|
||||
return r;
|
||||
}
|
||||
|
||||
r = dns_name_equal(p, "in-addr.arpa");
|
||||
if (r <= 0)
|
||||
return r;
|
||||
|
||||
*family = AF_INET;
|
||||
address->in.s_addr = htobe32(((uint32_t) a[3] << 24) |
|
||||
((uint32_t) a[2] << 16) |
|
||||
((uint32_t) a[1] << 8) |
|
||||
(uint32_t) a[0]);
|
||||
|
||||
return 1;
|
||||
}
|
||||
|
||||
r = dns_name_endswith(p, "ip6.arpa");
|
||||
if (r < 0)
|
||||
return r;
|
||||
if (r > 0) {
|
||||
struct in6_addr a;
|
||||
unsigned i;
|
||||
|
||||
for (i = 0; i < ELEMENTSOF(a.s6_addr); i++) {
|
||||
char label[DNS_LABEL_MAX+1];
|
||||
int x, y;
|
||||
|
||||
r = dns_label_unescape(&p, label, sizeof(label));
|
||||
if (r <= 0)
|
||||
return r;
|
||||
if (r != 1)
|
||||
return -EINVAL;
|
||||
x = unhexchar(label[0]);
|
||||
if (x < 0)
|
||||
return -EINVAL;
|
||||
|
||||
r = dns_label_unescape(&p, label, sizeof(label));
|
||||
if (r <= 0)
|
||||
return r;
|
||||
if (r != 1)
|
||||
return -EINVAL;
|
||||
y = unhexchar(label[0]);
|
||||
if (y < 0)
|
||||
return -EINVAL;
|
||||
|
||||
a.s6_addr[ELEMENTSOF(a.s6_addr) - i - 1] = (uint8_t) y << 4 | (uint8_t) x;
|
||||
}
|
||||
|
||||
r = dns_name_equal(p, "ip6.arpa");
|
||||
if (r <= 0)
|
||||
return r;
|
||||
|
||||
*family = AF_INET6;
|
||||
address->in6 = a;
|
||||
return 1;
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
int dns_name_root(const char *name) {
|
||||
char label[DNS_LABEL_MAX+1];
|
||||
int r;
|
||||
|
||||
assert(name);
|
||||
|
||||
r = dns_label_unescape(&name, label, sizeof(label));
|
||||
if (r < 0)
|
||||
return r;
|
||||
|
||||
return r == 0 && *name == 0;
|
||||
}
|
||||
|
||||
int dns_name_single_label(const char *name) {
|
||||
char label[DNS_LABEL_MAX+1];
|
||||
int r;
|
||||
|
||||
assert(name);
|
||||
|
||||
r = dns_label_unescape(&name, label, sizeof(label));
|
||||
if (r < 0)
|
||||
return r;
|
||||
if (r == 0)
|
||||
return 0;
|
||||
|
||||
r = dns_label_unescape(&name, label, sizeof(label));
|
||||
if (r < 0)
|
||||
return r;
|
||||
|
||||
return r == 0 && *name == 0;
|
||||
}
|
||||
@@ -0,0 +1,50 @@
|
||||
/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
|
||||
|
||||
/***
|
||||
This file is part of systemd.
|
||||
|
||||
Copyright 2014 Lennart Poettering
|
||||
|
||||
systemd is free software; you can redistribute it and/or modify it
|
||||
under the terms of the GNU Lesser General Public License as published by
|
||||
the Free Software Foundation; either version 2.1 of the License, or
|
||||
(at your option) any later version.
|
||||
|
||||
systemd is distributed in the hope that it will be useful, but
|
||||
WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
||||
Lesser General Public License for more details.
|
||||
|
||||
You should have received a copy of the GNU Lesser General Public License
|
||||
along with systemd; If not, see <http://www.gnu.org/licenses/>.
|
||||
***/
|
||||
|
||||
#pragma once
|
||||
|
||||
|
||||
#include "hashmap.h"
|
||||
#include "in-addr-util.h"
|
||||
|
||||
#define DNS_LABEL_MAX 63
|
||||
#define DNS_NAME_MAX 255
|
||||
|
||||
int dns_label_unescape(const char **name, char *dest, size_t sz);
|
||||
int dns_label_escape(const char *p, size_t l, char **ret);
|
||||
|
||||
int dns_label_apply_idna(const char *encoded, size_t encoded_size, char *decoded, size_t decoded_max);
|
||||
int dns_label_undo_idna(const char *encoded, size_t encoded_size, char *decoded, size_t decoded_max);
|
||||
|
||||
int dns_name_normalize(const char *s, char **_ret);
|
||||
|
||||
unsigned long dns_name_hash_func(const void *s, const uint8_t hash_key[HASH_KEY_SIZE]);
|
||||
int dns_name_compare_func(const void *a, const void *b);
|
||||
extern const struct hash_ops dns_name_hash_ops;
|
||||
|
||||
int dns_name_equal(const char *x, const char *y);
|
||||
int dns_name_endswith(const char *name, const char *suffix);
|
||||
|
||||
int dns_name_reverse(int family, const union in_addr_union *a, char **ret);
|
||||
int dns_name_address(const char *p, int *family, union in_addr_union *a);
|
||||
|
||||
int dns_name_root(const char *name);
|
||||
int dns_name_single_label(const char *name);
|
||||
Reference in New Issue
Block a user