enum.c

/*
 * Copyright (c) 2010-2022 Belledonne Communications SARL.
 *
 * This file is part of Liblinphone
 * (see https://gitlab.linphone.org/BC/public/liblinphone).
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as
 * published by the Free Software Foundation, either version 3 of the
 * License, or (at your option) any later version.
 *
 * This program 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 Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program. If not, see <http://www.gnu.org/licenses/>.
 */

/* enum lookup code */

#ifndef _WIN32_WCE
#include <errno.h>
#endif

#include <string.h>

#include "enum.h"

#define DNS_ANSWER_MAX_SIZE 2048

static char *create_enum_domain(const char *number) {
	long len = (long)strlen(number);
	char *domain = reinterpret_cast<char *>(ms_malloc((size_t)(len * 2) + 10));
	long i, j;

	for (i = 0, j = len - 1; j >= 0; j--) {
		domain[i] = number[j];
		i++;
		domain[i] = '.';
		i++;
	}
	strcpy(&domain[i], "e164.arpa");
	ms_message("enum domain for %s is %s", number, domain);
	return domain;
}

static bool_t is_a_number(const char *str) {
	char *p = (char *)str;
	bool_t res = FALSE;
	bool_t space_found = FALSE;
	for (;; p++) {
		switch (p[0]) {
			case '9':
			case '8':
			case '7':
			case '6':
			case '5':
			case '4':
			case '3':
			case '2':
			case '1':
			case '0':
				res = TRUE;
				if (space_found) return FALSE; /* avoid splited numbers */
				break;
			case '\0':
				return res;
				break;