--- a/cinst/main.c	Tue Mar 18 14:11:34 2014 +0000
+++ b/cinst/main.c	Tue Mar 18 14:14:15 2014 +0000
@@ -29,6 +29,7 @@
 #define MAX_INPUT_SIZE 2000000 /* MAX_LINE_LENGTH * (MAX_LINES *2) */
 
 #include <stdio.h>
+#include <stdlib.h>
 #include <string.h>
 #include <assert.h>
 
@@ -47,7 +48,7 @@
  *
  * @returns: 0 on success. An error code otherwise.
  */
-int readInput(char **certificateList, char ***to_install,
+int readInput(char **certificate_list, char ***to_install,
               char ***to_remove)
 {
     int lines_read = 0;
@@ -60,16 +61,16 @@
             printf("Too many lines\n");
             return ERR_TOO_MUCH_INPUT;
         }
-        if (strcmp("-----BEGIN CERTIFICATE LIST-----", buf) == 0){
+        if (strcmp("-----BEGIN CERTIFICATE LIST-----\r\n", buf) == 0){
             readingList = 1;
             continue;
         }
-        if (strcmp("-----END CERTIFICATE LIST-----", buf) == 0){
+        if (strcmp("-----END CERTIFICATE LIST-----\r\n", buf) == 0){
             readingList = 0;
             continue;
         }
         if (readingList) {
-            str_append_str(certificateList, buf, len);
+            str_append_str(certificate_list, buf, len);
             continue;
         }
         if (*buf == 'I') {
@@ -88,26 +89,55 @@
     return 0;
 }
 
+int validate_instructions(const char *certificate_list,
+                          const size_t listLen,
+                          const char **to_install,
+                          const char **to_remove)
+{
+    /* TODO */
+    return 0;
+}
+
 int main() {
-
     char **to_install = NULL;
     char **to_remove = NULL;
-    char *certificateList = NULL;
+    char *certificate_list = NULL;
+    size_t listLen = 0;
     int ret = -1;
 
-    ret = readInput(&certificateList, &to_install, &to_remove);
+    ret = readInput(&certificate_list, &to_install, &to_remove);
 
     if (ret != 0) {
         return ret;
     }
 
-    if (!certificateList) {
+    if (!certificate_list) {
         return ERR_INVALID_INPUT_NO_LIST;
     }
 
-    ret = verify_list(certificateList, strlen(certificateList));
+    listLen = strnlen(certificate_list, MAX_INPUT_SIZE);
 
-    printf ("Verify List returned %i\n", ret);
+    ret = verify_list(certificate_list, listLen);
+
+    if (ret != 0) {
+        return ERR_INVALID_SIGNATURE;
+    }
+
+    if (!strv_length(to_install) && !strv_length(to_remove)) {
+        return ERR_NO_INSTRUCTIONS;
+    }
+
+    /* Check that the instructions are ok to execute */
+    ret = validate_instructions(certificate_list, to_install, to_remove);
+
+    if (ret != 0) {
+        return ERR_INVALID_INSTRUCTIONS;
+    }
+
+    /* Make valgrind happy */
+    strfreev (to_install);
+    strfreev (to_remove);
+    free (certificate_list);
 
     return 0;
 }

--- a/common/errorcodes.h	Tue Mar 18 14:11:34 2014 +0000
+++ b/common/errorcodes.h	Tue Mar 18 14:14:15 2014 +0000
@@ -5,5 +5,11 @@
 #define ERR_INVALID_INPUT_NO_LIST 2
 /* Too much input for the installer process */
 #define ERR_TOO_MUCH_INPUT 3
+/* Invalid signature */
+#define ERR_INVALID_SIGNATURE 4
+/* No instructions */
+#define ERR_NO_INSTRUCTIONS 5
+/* Instructions not valid (certs not part of certificate list) */
+#define ERR_INVALID_INSTRUCTIONS 6
 
 #endif