From dd7dfca9b90f542ff02d8d71be39bf2cd85c0d42 Mon Sep 17 00:00:00 2001
From: Sander Vrijders <sander.vrijders@ugent.be>
Date: Fri, 25 Aug 2017 12:48:37 +0200
Subject: lib: Add configuration message to FRCT

This adds the configuration message to FRCT, which allows for
configuring the connection.
---
 src/lib/frct_pci.c | 62 +++++++++++++++++++++++++++++++++++++++---------------
 1 file changed, 45 insertions(+), 17 deletions(-)

(limited to 'src/lib/frct_pci.c')

diff --git a/src/lib/frct_pci.c b/src/lib/frct_pci.c
index 5ee14829..115a3eb9 100644
--- a/src/lib/frct_pci.c
+++ b/src/lib/frct_pci.c
@@ -24,18 +24,25 @@
 #include <ouroboros/hash.h>
 #include <ouroboros/errno.h>
 
-#define OUROBOROS_PREFIX "frct-pci"
-#include <ouroboros/logs.h>
-
 #include <assert.h>
 #include <string.h>
 
-#define TYPE_SIZE  1
-#define SEQNO_SIZE 8
-#define FLAGS_SIZE 1
+#define TYPE_SIZE       1
+#define SEQNO_SIZE      8
+#define FLAGS_SIZE      1
+#define CONF_FLAGS_SIZE 1
+#define BASE_SIZE       TYPE_SIZE + FLAGS_SIZE + SEQNO_SIZE
+#define CONFIG_SIZE     CONF_FLAGS_SIZE
+
+static size_t get_head_len(struct frct_pci * pci)
+{
+        size_t len = BASE_SIZE;
+
+        if (pci->type & PDU_TYPE_CONFIG)
+                len += CONFIG_SIZE;
 
-/* FIXME: Head size will differ on type */
-#define HEAD_SIZE TYPE_SIZE + FLAGS_SIZE + SEQNO_SIZE
+        return len;
+}
 
 int frct_pci_ser(struct shm_du_buff * sdb,
                  struct frct_pci *    pci,
@@ -43,22 +50,34 @@ int frct_pci_ser(struct shm_du_buff * sdb,
 {
         uint8_t * head;
         uint8_t * tail;
+        size_t    len;
+        size_t    offset = 0;
 
         assert(sdb);
         assert(pci);
 
-        head = shm_du_buff_head_alloc(sdb, HEAD_SIZE);
+        len = get_head_len(pci);
+
+        head = shm_du_buff_head_alloc(sdb, len);
         if (head == NULL)
                 return -EPERM;
 
         memcpy(head, &pci->type, TYPE_SIZE);
-        memcpy(head + TYPE_SIZE, &pci->flags, FLAGS_SIZE);
-        memcpy(head + TYPE_SIZE + FLAGS_SIZE, &pci->seqno, SEQNO_SIZE);
+        offset += TYPE_SIZE;
+        memcpy(head + offset, &pci->flags, FLAGS_SIZE);
+        offset += FLAGS_SIZE;
+        memcpy(head + offset, &pci->seqno, SEQNO_SIZE);
+        offset += SEQNO_SIZE;
+
+        if (pci->type & PDU_TYPE_CONFIG) {
+                memcpy(head + offset, &pci->conf_flags, CONF_FLAGS_SIZE);
+                offset += CONF_FLAGS_SIZE;
+        }
 
         if (error_check) {
                 tail = shm_du_buff_tail_alloc(sdb, hash_len(HASH_CRC32));
                 if (tail == NULL) {
-                        shm_du_buff_head_release(sdb, HEAD_SIZE);
+                        shm_du_buff_head_release(sdb, len);
                         return -EPERM;
                 }
 
@@ -77,16 +96,25 @@ int frct_pci_des(struct shm_du_buff * sdb,
         uint8_t * tail;
         uint32_t  crc;
         uint32_t  crc2;
+        size_t    offset = 0;
 
         assert(sdb);
         assert(pci);
 
         head = shm_du_buff_head(sdb);
 
-         /* FIXME: Depending on the type a different deserialization */
+         /* Depending on the type a different deserialization. */
         memcpy(&pci->type, head, TYPE_SIZE);
-        memcpy(&pci->flags, head + TYPE_SIZE, FLAGS_SIZE);
-        memcpy(&pci->seqno, head + TYPE_SIZE + FLAGS_SIZE, SEQNO_SIZE);
+        offset += TYPE_SIZE;
+        memcpy(&pci->flags, head + offset, FLAGS_SIZE);
+        offset += FLAGS_SIZE;
+        memcpy(&pci->seqno, head + offset, SEQNO_SIZE);
+        offset += SEQNO_SIZE;
+
+        if (pci->type & PDU_TYPE_CONFIG) {
+                memcpy(&pci->conf_flags, head + offset, CONF_FLAGS_SIZE);
+                offset += CONF_FLAGS_SIZE;
+        }
 
         if (error_check) {
                 tail = shm_du_buff_tail(sdb);
@@ -99,14 +127,14 @@ int frct_pci_des(struct shm_du_buff * sdb,
                 memcpy(&crc2, tail - hash_len(HASH_CRC32),
                        hash_len(HASH_CRC32));
 
-                /* Corrupted SDU */
+                /* Corrupted SDU. */
                 if (crc != crc2)
                         return -1;
 
                 shm_du_buff_tail_release(sdb, hash_len(HASH_CRC32));
         }
 
-        shm_du_buff_head_release(sdb, HEAD_SIZE);
+        shm_du_buff_head_release(sdb, get_head_len(pci));
 
         return 0;
 }
-- 
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