diff --git a/socktest/rcv.c b/socktest/rcv.c
index c0c04d63..ce9952fd 100644
--- a/socktest/rcv.c
+++ b/socktest/rcv.c
@@ -1,11 +1,48 @@
 #include "common.h"
 
-int
+/*
+ * Print out:
+ *  <src>:<port> -> <dst> ifa(<id>) <name>: pkt <value>/<count>, ttl <ttl>
+ */
+static void
+rcv_print(sock *sk, struct my_packet *pkt)
+{
+  char ifa_name[IF_NAMESIZE];
+  char buf[1024];
+  char *pos;
+  int unused_size;
+
+  if (!if_indextoname(sk->lifindex, ifa_name))
+  {
+    perror("if_indextoname");
+    snprintf(ifa_name, sizeof(ifa_name), "???");
+  }
+
+  bsnprintf(buf, sizeof(buf), "%I", sk->faddr);
+  pos = buf + strlen(buf);
+  unused_size = sizeof(buf) - (pos - buf);
+
+  if (sk->type != SK_IP)
+    bsnprintf(pos, unused_size, ":%u", sk->fport);
+  pos = buf + strlen(buf);
+  unused_size = sizeof(buf) - (pos - buf);
+
+  bsnprintf(pos, unused_size, " -> %I ifa(%u) %s: ", sk->laddr, sk->lifindex, ifa_name);
+  pos = buf + strlen(buf);
+  unused_size = sizeof(buf) - (pos - buf);
+
+  if (pkt->magic == (u32)PKT_MAGIC)
+    bsnprintf(pos, unused_size, "pkt %d/%d, ttl %d", pkt->value, pkt->count, sk->rcv_ttl);
+  else
+    bsnprintf(pos, unused_size, "magic value does not pass: recv %u, expected %u", pkt->magic, (u32)PKT_MAGIC);
+
+  printf("%s\n", buf);
+}
+
+static int
 rcv_hook(sock *sk, int size)
 {
   struct my_packet *raw;
-  char ifa_name[IF_NAMESIZE];
-  char buf[1024];
 
   if (cf_count && ++counter > cf_count)
     exit(0);
@@ -27,20 +64,7 @@ rcv_hook(sock *sk, int size)
       .count = ntohl(raw->count),
   };
 
-  if (!if_indextoname(sk->lifindex, ifa_name))
-  {
-    perror("if_indextoname");
-    snprintf(ifa_name, sizeof(ifa_name), "???");
-  }
-
-  bsnprintf(buf, sizeof(buf), "%I:%u -> %I ifa(%u) %s: ", sk->faddr, sk->fport, sk->laddr, sk->lifindex, ifa_name);
-  char *pos = buf + strlen(buf);
-  if (pkt.magic == (u32)PKT_MAGIC)
-    bsnprintf(pos, pos-buf, "pkt %d/%d, ttl %d", pkt.value, pkt.count, sk->rcv_ttl);
-  else
-    bsnprintf(pos, pos-buf, "magic value does not pass: recv %u, expected %u", pkt.magic, (u32)PKT_MAGIC);
-
-  printf("%s\n", buf);
+  rcv_print(sk, &pkt);
 
   /* Clear receive buffer */
   return 1;