net: add tcp_hdr_print

Makefile.dep

@@ -341,6 +341,7 @@ endif
 ifneq (,$(filter gnrc_tcp,$(USEMODULE)))
   USEMODULE += inet_csum
   USEMODULE += random
+  USEMODULE += tcp
   USEMODULE += xtimer
 endif
 

sys/Makefile

@@ -79,6 +79,9 @@ endif
 ifneq (,$(filter udp,$(USEMODULE)))
     DIRS += net/transport_layer/udp
 endif
+ifneq (,$(filter tcp,$(USEMODULE)))
+    DIRS += net/transport_layer/tcp
+endif
 
 ifneq (,$(filter hamming256,$(USEMODULE)))
     DIRS += ecc/hamming256

sys/include/net/tcp.h

@@ -75,6 +75,13 @@ typedef struct __attribute__((packed)) {
     uint8_t value[];  /**< Pointer to TCP options Value field */
 } tcp_hdr_opt_t;
 
+/**
+ * @brief   Print the given TCP header to STDOUT
+ *
+ * @param[in] hdr           TCP header to print
+ */
+void tcp_hdr_print(tcp_hdr_t *hdr);
+
 #ifdef __cplusplus
 }
 #endif

sys/net/transport_layer/tcp/Makefile

@@ -0,0 +1 @@
+include $(RIOTBASE)/Makefile.base

sys/net/transport_layer/tcp/tcp_hdr_print.c

@@ -0,0 +1,33 @@
+/*
+ * Copyright (C) 2017 HAW Hamburg
+ *
+ * This file is subject to the terms and conditions of the GNU Lesser
+ * General Public License v2.1. See the file LICENSE in the top level
+ * directory for more details.
+ */
+
+/**
+ * @{
+ *
+ * @file
+ *
+ * @author smlng <s@mlng.net>
+ */
+
+#include <stdio.h>
+#include <inttypes.h>
+
+#include "net/tcp.h"
+
+void tcp_hdr_print(tcp_hdr_t *hdr)
+{
+    printf("   src-port: %5" PRIu16 "  dst-port: %5" PRIu16 "\n",
+           byteorder_ntohs(hdr->src_port), byteorder_ntohs(hdr->dst_port));
+    printf("   seq-num: %10" PRIu32 "  ack-num: %10" PRIu32 "\n",
+           byteorder_ntohl(hdr->seq_num), byteorder_ntohl(hdr->ack_num));
+    printf("   off_ctl: %5" PRIu16 "  window: %5" PRIu16 "\n",
+           byteorder_ntohs(hdr->off_ctl), byteorder_ntohs(hdr->window));
+    printf("   cksum: 0x%04" PRIx16 "  urgent_ptr: %5" PRIu16 "\n",
+           byteorder_ntohs(hdr->checksum), byteorder_ntohs(hdr->urgent_ptr));
+}
+/** @} */