Fix udp mode when listening on ipv6 addresses.

acleone · dormando · commit c6a700a39b1d · 2013-12-20T00:39:47.000-08:00
Previously the memcached could not respond to ipv6 udp packets correctly,
since the client's address was stored in a struct sockaddr (16 bytes on
linux) instead of a struct sockaddr_in6 (28 bytes).
diff --git a/memcached.c b/memcached.c
@@ -3591,7 +3591,8 @@ static enum try_read_result try_read_udp(conn *c) {
 
     c->request_addr_size = sizeof(c->request_addr);
     res = recvfrom(c->sfd, c->rbuf, c->rsize,
-                   0, &c->request_addr, &c->request_addr_size);
+                   0, (struct sockaddr *)&c->request_addr,
+                   &c->request_addr_size);
     if (res > 8) {
         unsigned char *buf = (unsigned char *)c->rbuf;
         pthread_mutex_lock(&c->thread->stats.mutex);
diff --git a/memcached.h b/memcached.h
@@ -437,7 +437,7 @@ struct conn {
 
     /* data for UDP clients */
     int    request_id; /* Incoming UDP request ID, if this is a UDP "connection" */
-    struct sockaddr request_addr; /* Who sent the most recent request */
+    struct sockaddr_in6 request_addr; /* udp: Who sent the most recent request */
     socklen_t request_addr_size;
     unsigned char *hdrbuf; /* udp packet headers */
     int    hdrsize;   /* number of headers' worth of space is allocated */
