add example of ggnet_dns reverse dns lookup usage

1 files changed, 38 insertions, 0 deletions

diff --git a/libglouglou/examples/dnsreverse.c b/libglouglou/examples/dnsreverse.c
new file mode 100644
index 0000000..c5ae83b
--- /dev/null
+++ b/libglouglou/examples/dnsreverse.c
@@ -0,0 +1,38 @@
+#include <stdlib.h>
+#include <sys/socket.h>
+#include <netinet/in.h>
+#include <arpa/inet.h>
+
+#include <libggnet_dns.h>
+
+static void _cb_dns(struct in_addr *, char *, void *);
+
+struct event_base *_ev_base;
+
+int
+main(int argc, char *argv[])
+{
+  struct ggnet_dns *ggdns;
+  struct in_addr ip;
+
+  if (argc < 2) {
+    printf("usage: dnsreverse <fqdn>\n");
+    exit(1);
+  }
+  inet_aton(argv[1], &ip);
+
+  _ev_base = event_base_new();
+
+  ggdns = ggnet_dns_new(_ev_base);
+  ggnet_dns_reverse(ggdns, &ip, _cb_dns, NULL);
+
+  event_base_dispatch(_ev_base);
+  return 0;
+}
+
+static void
+_cb_dns(struct in_addr *ip, char *name, void *data)
+{
+  printf("%x: %s\n", ip->s_addr, name);
+  event_base_loopexit(_ev_base, NULL);
+}