started to write a test d4 client

client/Makefile

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+d4:	d4.c
+	gcc -Wall -o d4 d4.c

client/d4.c

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+#include <stdio.h>
+#include <stdlib.h>
+#include <stdint.h>
+#include <getopt.h>
+#include <string.h>
+
+#include "d4.h"
+//Returns -1 on error, 0 otherwise
+int d4_load_config(d4_t* d4)
+{
+    return -1;
+}
+
+void usage(void)
+{
+    printf("d4 client help\n");
+}
+
+d4_t* d4_init(char* confdir)
+{
+    d4_t* out;
+    out = calloc(1,sizeof(d4_t));
+    if (out) {
+        strncpy(out->confdir, confdir, FILENAME_MAX);
+    }
+    // Do other inititalization stuff here
+    return out;
+}
+
+int main (int argc, char* argv[])
+{
+    int opt;
+    char* confdir;
+    d4_t* d4;
+
+    confdir=calloc(1,FILENAME_MAX);
+    if (!confdir)
+        return EXIT_FAILURE;
+
+    while ((opt = getopt(argc, argv, "c:h")) != -1) {
+        switch (opt) {
+            case 'h':
+                usage();
+                return EXIT_SUCCESS;
+            case 'c':
+                strncpy(confdir, optarg, FILENAME_MAX);
+                break;
+            default:
+                fprintf(stderr,"An invalid command line argument was specified\n");
+        }
+    }
+    if (!confdir[0]){
+        fprintf(stderr,"A config directory must be specified\n");
+        return EXIT_FAILURE;
+    }
+
+
+    d4_init(confdir);
+    free(confdir);
+    d4_load_config(d4);
+    return EXIT_SUCCESS;
+}

client/d4.h

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+#ifndef D4_H
+#define D4_H
+
+typedef struct d4_header_s {
+    uint8_t  version;
+    uint8_t type;
+    uint8_t uuid[128];
+    uint64_t timestamp;
+    uint8_t hmac[256];
+    uint32_t size;
+} d4_header_t;
+
+// Information about the source
+typedef struct source_s {
+    int fd;
+} source_t;
+
+//Information about the destination
+//Write data to stdout, fifo, shared memory segment
+typedef struct destination_s {
+    int fd;
+} destination_t;
+
+typedef struct d4_s {
+    source_t source;
+    destination_t destination;
+    char confdir[FILENAME_MAX];
+    int snaplen;
+    int caplen;
+    int d4_error;
+    int errno_copy;
+} d4_t;
+
+
+
+/* D4 configuration is a directory structure shown below (like proc filesytem)
+ * d4-conf/snaplen
+ * d4-conf/caplen
+ * d4-conf/uuid
+ * d4-conf/collector
+ */
+
+const char* d4params[] = {"uuid", "snaplen", "caplen", "timestamp", "collector"};
+#define ND4PARAMS 5
+
+#define UUID 0
+#define SNAPLEN 1
+#define CAPLEN 2
+#define TIMESTAMP 3
+#define COLLECTOR 4
+
+#endif