1 files changed, 97 insertions, 0 deletions
diff --git a/examples/ldns-mx.c b/examples/ldns-mx.c
new file mode 100644
index 0000000..84d27c8
--- /dev/null
+++ b/examples/ldns-mx.c
@@ -0,0 +1,97 @@
+/*
+ * mx is a small program that prints out the mx records
+ * for a particular domain
+ * (c) NLnet Labs, 2005 - 2008
+ * See the file LICENSE for the license
+ */
+
+#include "config.h"
+
+#include <ldns/ldns.h>
+
+static int
+usage(FILE *fp, char *prog) {
+	fprintf(fp, "%s domain\n", prog);
+	fprintf(fp, "  print out the mx for domain\n");
+	return 0;
+}
+
+int
+main(int argc, char *argv[])
+{
+	ldns_resolver *res;
+	ldns_rdf *domain;
+	ldns_pkt *p;
+	ldns_rr_list *mx;
+	ldns_status s;
+	
+	p = NULL;
+	mx = NULL;
+	domain = NULL;
+	res = NULL;
+	
+	if (argc != 2) {
+		usage(stdout, argv[0]);
+		exit(EXIT_FAILURE);
+	} else {
+		/* create a rdf from the command line arg */
+		domain = ldns_dname_new_frm_str(argv[1]);
+		if (!domain) {
+			usage(stdout, argv[0]);
+			exit(EXIT_FAILURE);
+		}
+		if (! ldns_dname_str_absolute(argv[1]) &&
+		    ldns_dname_absolute(domain)) {
+
+			/* ldns_dname_new_frm_str makes absolute dnames always!
+			 * So deabsolutify domain.
+			 * TODO: Create ldns_dname_new_frm_str_relative? Yuck!
+			 */
+			ldns_rdf_set_size(domain, ldns_rdf_size(domain) - 1);
+		}
+	}
+
+	/* create a new resolver from /etc/resolv.conf */
+	s = ldns_resolver_new_frm_file(&res, NULL);
+
+	if (s != LDNS_STATUS_OK) {
+		exit(EXIT_FAILURE);
+	}
+
+	/* use the resolver to send a query for the mx 
+	 * records of the domain given on the command line
+	 */
+	p = ldns_resolver_search(res,
+	                         domain,
+	                         LDNS_RR_TYPE_MX,
+	                         LDNS_RR_CLASS_IN,
+	                         LDNS_RD);
+
+	ldns_rdf_deep_free(domain);
+	
+        if (!p)  {
+		exit(EXIT_FAILURE);
+        } else {
+		/* retrieve the MX records from the answer section of that
+		 * packet
+		 */
+		mx = ldns_pkt_rr_list_by_type(p,
+		                              LDNS_RR_TYPE_MX,
+		                              LDNS_SECTION_ANSWER);
+		if (!mx) {
+			fprintf(stderr, 
+					" *** invalid answer name %s after MX query for %s\n",
+					argv[1], argv[1]);
+                        ldns_pkt_free(p);
+                        ldns_resolver_deep_free(res);
+			exit(EXIT_FAILURE);
+		} else {
+			ldns_rr_list_sort(mx); 
+			ldns_rr_list_print(stdout, mx);
+			ldns_rr_list_deep_free(mx);
+		}
+        }
+        ldns_pkt_free(p);
+        ldns_resolver_deep_free(res);
+        return 0;
+}