From e71576ba5294f019c19b623472677c2600883363 Mon Sep 17 00:00:00 2001
From: Kai Blin <kai@samba.org>
Date: Sun, 15 May 2011 21:33:32 +0200
Subject: [PATCH] Make the sender able to receive a response to the multicast
 query

---
 sender.c | 24 ++++++++----------------
 1 file changed, 8 insertions(+), 16 deletions(-)

diff --git a/sender.c b/sender.c
index 8ca2927..1d54519 100644
--- a/sender.c
+++ b/sender.c
@@ -14,7 +14,7 @@ int main(int argc, char **argv)
 {
     int err;
     int sock6;
-    int idx = if_nametoindex("wlan0");
+    int idx = if_nametoindex("br0");
     struct addrinfo hints, *ai, *pai;
     uint8_t data[] = {
         0x17, 0x2a, /* id */
@@ -51,30 +51,22 @@ int main(int argc, char **argv)
 
         err = setsockopt(sock6, IPPROTO_IPV6, IPV6_MULTICAST_IF, &idx, sizeof(idx));
         if (err != 0) {
-            perror("setting default multicast interface");
+            close(sock6);
+            continue;
         }
 
-        if (connect(sock6, pai->ai_addr, pai->ai_addrlen) != -1) {
-            /* success, end loop */
-            break;
+        if (sendto(sock6, data, sizeof(data), 0,
+                   pai->ai_addr, pai->ai_addrlen) == sizeof(data)) {
+            break; /* success, break out of loop */
         }
 
+        perror("writing data");
         close(sock6);
     }
 
-    if (pai == NULL) {
-        fprintf(stderr, "Could not connect to %s\n", "ff02::1:3");
-        exit(1);
-    }
-
     freeaddrinfo(ai);
 
-    if (write(sock6, data, sizeof(data)) != sizeof(data)) {
-        perror("writing data");
-        exit(1);
-    }
-
-    nread = read(sock6, reply, 1024);
+    nread = recvfrom(sock6, reply, 1024, 0, NULL, NULL);
     if (nread == -1) {
         perror("reading reply");
         exit(1);
-- 
2.34.1