From 8e5b5cf46b710950cb8b3b0c763de82766a3ed4b Mon Sep 17 00:00:00 2001
From: Gerard Wagener <gerard.wagener@circl.lu>
Date: Tue, 27 Nov 2018 23:14:23 +0100
Subject: [PATCH] rough and incomplete working processing program

---
 client/d4.c | 47 ++++++++++++++++++++++++++++++++++++++++++++---
 client/d4.h |  2 ++
 2 files changed, 46 insertions(+), 3 deletions(-)

diff --git a/client/d4.c b/client/d4.c
index 9df584b..ab4afcb 100644
--- a/client/d4.c
+++ b/client/d4.c
@@ -8,6 +8,7 @@
 #include <fcntl.h>
 #include <unistd.h>
 #include <errno.h>
+#include <time.h>
 
 #include "d4.h"
 //
@@ -83,6 +84,46 @@ d4_t* d4_init(char* confdir)
     return out;
 }
 
+
+//FIXME split in prepare and update. Do not copy uuid each time
+void d4_update_header(d4_t* d4, ssize_t nread) {
+    bzero(&d4->header,sizeof(d4_update_header));
+    //TODO Check format
+    d4->header.version = atoi(d4->conf[VERSION]);
+    //TODO set type
+    d4->header.timestamp = time(NULL);
+    //FIXME length handling
+    strncpy((char*)&(d4->header.uuid), d4->conf[UUID], SZUUID);
+    //TODO hmac
+    d4->header.size=nread;
+}
+
+//Core routine. Transfers data from the source to the destinations
+void d4_transfert(d4_t* d4)
+{
+    ssize_t nread;
+    char* buf;
+
+    buf = calloc(1, d4->snaplen);
+    //TODO error handling -> insert error message
+    if (!buf)
+        return;
+
+    while ( 1 ) {
+        //In case of errors see block of 0 bytes
+        bzero(buf, d4->snaplen);
+        nread = read(d4->source.fd, buf, d4->snaplen);
+        if ( nread > 0 ) {
+            d4_update_header(d4, nread);
+            write(d4->destination.fd, &d4->header, sizeof(d4->header));
+            write(d4->destination.fd,buf,nread);
+        } else{
+            //FIXME no data available, sleep, abort, retry
+            break;
+        }
+    }
+}
+
 int main (int argc, char* argv[])
 {
     int opt;
@@ -113,9 +154,9 @@ int main (int argc, char* argv[])
 
     d4 = d4_init(confdir);
     free(confdir);
-    d4_load_config(d4);
-
-
+    if (d4_load_config(d4)) {
+        d4_transfert(d4);
+    }
 
     return EXIT_SUCCESS;
 }
diff --git a/client/d4.h b/client/d4.h
index cc33295..71a7e58 100644
--- a/client/d4.h
+++ b/client/d4.h
@@ -9,6 +9,7 @@
 #define STDIN "stdin"
 #define STDOUT "stdout"
 #define MAXSNAPLEN 65535
+#define SZUUID 128
 
 #define INSERT_ERROR(...) do { \
     if (d4->err_idx < NERRORS) \
@@ -47,6 +48,7 @@ typedef struct d4_s {
     char conf[ND4PARAMS][SZCONFVALUE];
     char errors[NERRORS][SZERRVALUE];
     int err_idx;
+    d4_header_t header;
 } d4_t;