+/******************************************************************************/
+/* pfixtools: a collection of postfix related tools */
+/* ~~~~~~~~~ */
+/* ________________________________________________________________________ */
+/* */
+/* Redistribution and use in source and binary forms, with or without */
+/* modification, are permitted provided that the following conditions */
+/* are met: */
+/* */
+/* 1. Redistributions of source code must retain the above copyright */
+/* notice, this list of conditions and the following disclaimer. */
+/* 2. Redistributions in binary form must reproduce the above copyright */
+/* notice, this list of conditions and the following disclaimer in the */
+/* documentation and/or other materials provided with the distribution. */
+/* 3. The names of its contributors may not be used to endorse or promote */
+/* products derived from this software without specific prior written */
+/* permission. */
+/* */
+/* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND */
+/* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE */
+/* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR */
+/* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS */
+/* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR */
+/* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF */
+/* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS */
+/* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN */
+/* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) */
+/* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF */
+/* THE POSSIBILITY OF SUCH DAMAGE. */
+/******************************************************************************/
+
+/*
+ * Copyright © 2008 Florent Bruneau
+ */
+
+#include <netdb.h>
+#include "rbl.h"
+
+static inline rbl_result_t rbl_dns_check(const char *hostname)
+{
+ struct hostent *host = gethostbyname(hostname);
+ if (host != NULL) {
+ return RBL_FOUND;
+ } else {
+ if (h_errno == HOST_NOT_FOUND) {
+ return RBL_NOTFOUND;
+ }
+ return RBL_ERROR;
+ }
+}
+
+rbl_result_t rbl_check(const char *rbl, uint32_t ip)
+{
+ char host[257];
+ snprintf(host, 257, "%d.%d.%d.%d.%s",
+ ip & 0xff, (ip >> 8) & 0xff, (ip >> 16) & 0xff, (ip >> 24) & 0xff,
+ rbl);
+ return rbl_dns_check(host);
+}
+
+rbl_result_t rhbl_check(const char *rhbl, const char *hostname)
+{
+ char host[257];
+ snprintf(host, 257, "%s.%s", hostname, rhbl);
+ return rbl_dns_check(host);
+}