Add support for rbl by dns resolution.

[apps/pfixtools.git] / common / rbl.c

diff --git a/common/rbl.c b/common/rbl.c
new file mode 100644 (file)
index 0000000..11ed464
--- /dev/null
+++ b/common/rbl.c
@@ -0,0 +1,66 @@
+/******************************************************************************/
+/*          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);
+}