diff --git a/src/fieldset.c b/src/fieldset.c
index 327afe1..5c105cb 100644
--- a/src/fieldset.c
+++ b/src/fieldset.c
@@ -7,10 +7,24 @@
 
 #include "../lib/logger.h"
 
-
-int fs_split_string(int *len, char**results)
+int fs_split_string(char* in, int *len, char**results)
 {
+	
+	char** fields = calloc(MAX_FIELDS, sizeof(char*));
+	memset(fields, 0, sizeof(fields));
+	int retvlen = 0;
+	char *currloc = in;
+	// parse csv into a set of strings
+	while (1) {
+		size_t len = strcspn(currloc, ", ");	
+		char *new = malloc(len+1);
+			
+	
+	}
+
 	(void)len;
+	*results = fields;
+	*len = retvlen;
 	(void)results;
 	return 0;
 }
diff --git a/src/probe_modules/probe_modules.c b/src/probe_modules/probe_modules.c
index de3c618..f87ebeb 100644
--- a/src/probe_modules/probe_modules.c
+++ b/src/probe_modules/probe_modules.c
@@ -67,6 +67,18 @@ char *make_ip_str(uint32_t ip)
 	return retv;
 }
 
+fielddef_t ip_fields[] = {
+	{.name="saddr", .type="string", .desc="source IP address of response"},
+	{.name="daddr", .type="string", .desc="destination IP address of response"},
+	{.name="ipid", .type="int", .desc="IP identification number of response"},
+	{.name="ttl", .type="int", .desc="time-to-live of response packet"}
+}
+
+fielddef_t sys_fields[] = {
+	{.name="repeat", .type="int", .desc="Is response a repeat response from host"},
+	{.name="timestamp-str", .type="string", .desc="timestamp of when response arrived in ISO8601 format."}
+}
+
 void fs_add_ip_fields(fieldset_t *fs, struct iphdr *ip)
 {
 	fs_add_string(fs, "saddr", make_ip_str(ip->saddr), 1);
@@ -75,3 +87,9 @@ void fs_add_ip_fields(fieldset_t *fs, struct iphdr *ip)
 	fs_add_uint64(fs, "ttl", ntohl(ip->ttl));
 }
 
+void fs_add_system_fields(fieldset_t *fs)
+{
+
+
+}
+