From f367d3a3191315dda7f00a1351e885e37247f46c Mon Sep 17 00:00:00 2001
From: Jacob <windlejacob12@gmail.com>
Date: Wed, 18 Dec 2019 13:46:16 -0500
Subject: [PATCH] Working on linked list data structure for hosts.

---
 CMakeLists.txt |  2 +-
 linkedlist.c   | 37 +++++++++++++++++++++++++++++++++++++
 linkedlist.h   | 21 +++++++++++++++++++++
 main.c         |  7 +++++--
 4 files changed, 64 insertions(+), 3 deletions(-)
 create mode 100644 linkedlist.c
 create mode 100644 linkedlist.h

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 619ee79..81bbc27 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,3 +1,3 @@
 project(HostBlocker)
 find_package(PkgConfig REQUIRED)
-add_executable(hb main.c)
\ No newline at end of file
+add_executable(hb main.c linkedlist.c linkedlist.h)
\ No newline at end of file
diff --git a/linkedlist.c b/linkedlist.c
new file mode 100644
index 0000000..a51e1e3
--- /dev/null
+++ b/linkedlist.c
@@ -0,0 +1,37 @@
+//
+// Created by jake on 12/17/19.
+//
+
+#include "linkedlist.h"
+
+LinkedList *linkedlist_new() {
+    LinkedList *tmp = (LinkedList *) malloc(sizeof(LinkedList));
+    tmp->data = NULL;
+    return tmp;
+}
+
+/**
+ * Add a char * to our linked list and set up a new head.
+ * @param head The first node in the list.
+ * @param data Our data to add to the list.
+ * @return
+ */
+void *linkedlist_add(LinkedList *head, char *data) {
+    if (head == NULL) {
+        head = linkedlist_new();
+    }
+    if (head->data == NULL) {
+        head->data = data;
+    }
+    LinkedList *tmp = linkedlist_new();
+    // Set the head pointer to the next node.
+    head->next = tmp;
+
+    // Set head to tmp.
+    head = tmp;
+}
+
+void free_node(LinkedList *node) {
+    free(node->data);
+    free(node);
+}
\ No newline at end of file
diff --git a/linkedlist.h b/linkedlist.h
new file mode 100644
index 0000000..c137ce9
--- /dev/null
+++ b/linkedlist.h
@@ -0,0 +1,21 @@
+//
+// Created by jake on 12/17/19.
+//
+
+#ifndef HOSTBLOCKER_LINKEDLIST_H
+#define HOSTBLOCKER_LINKEDLIST_H
+
+#include <stdlib.h>
+
+/**
+ * Our linked list structure to be used for holding configuration files.
+ */
+typedef struct linkedlist {
+    char *data;
+    struct linkedlist *next;
+} LinkedList;
+
+LinkedList *linkedlist_new();
+void *linkedlist_add(LinkedList *head, char *data);
+
+#endif //HOSTBLOCKER_LINKEDLIST_H
diff --git a/main.c b/main.c
index db7902e..ab9ae27 100644
--- a/main.c
+++ b/main.c
@@ -6,6 +6,8 @@
 #include <sys/types.h>
 #include <sys/wait.h>
 
+#include "linkedlist.h"
+
 // Macro for status checks.
 #define ONFAILED(status, fn) if(status > fn)
 
@@ -19,7 +21,8 @@
 /** GLOBALS **/
 // Our rule we use to blackhole domains
 const char *blockString = "0.0.0.0 ";
-const char *CONFIG;
+LinkedList *hosts = (LinkedList *) NULL;
+
 // The current hardcoded location of the hosts file.
 static const char *HOSTFILE = "/etc/hosts";
 // Our configuration
@@ -97,7 +100,7 @@ void showHosts()
  */
 int read_config_file() {
     // increment the refcount for tmp.
-
+    linkedlist_add(hosts, "hello.com");
 }
 
 /**