implement basic unit testing

Makefile

@@ -5,6 +5,7 @@
 IDIR = ./include
 BDIR = ./build
 SDIR = ./src
+TDIR = ./tests
 
 include config.mk
 
@@ -34,6 +35,9 @@ lib: $(SDIR)/libglacier.c
 	$(CC) $(SDIR)/libglacier.c -c $(LIBFLAGS) -o $(BDIR)/lib/libglacier.o
 	$(AR) -rc $(BDIR)/lib/libglacier.a build/lib/libglacier.o
 
+test: $(BDIR) $(TDIR)/Makefile
+	make -f tests/Makefile
+
 install_lib: $(BDIR)/lib/libglacier.a
 	@echo "[INFO]"
 	@echo "[INFO] Installing library to PREFIX/lib..."
@@ -59,3 +63,6 @@ install: install_lib install_head
 
 clean:
 	rm -rf $(BDIR)
+
+distclean: $(BDIR) $(TDIR)/test-suite
+	rm -rf $(BDIR) $(TDIR)/test-suite

src/libglacier.c

@@ -20,7 +20,7 @@
 #include <errno.h>
 #include <libconfig.h>
 #include <locale.h>
-#include <openssl/sha.h>
+#include <openssl/evp.h>
 #include <stdbool.h>
 #include <stdio.h>
 #include <stdlib.h>
@@ -669,7 +669,7 @@ print_hash(uchar *hash, uint length)
  *
  */
 
-int
+/*int
 stash_hash(uchar *stored_hash, uchar *hash, uint length)
 {
 	if (sizeof(stored_hash) != 32 && LG_VERBOSE == 1) {
@@ -693,7 +693,7 @@ stash_hash(uchar *stored_hash, uchar *hash, uint length)
 	}
 
 	return 0;
-}
+} */
 
 /*
  * hash_file
@@ -704,8 +704,8 @@ stash_hash(uchar *stored_hash, uchar *hash, uint length)
  *
  */
 
-int
-hash_file(const char *filename, uchar *destination_string)
+unsigned char
+hash_file(const char *filename)
 {
 	FILE *data = fopen(filename, "rb");
 	if (! data && LG_VERBOSE == 1) {
@@ -749,20 +749,19 @@ hash_file(const char *filename, uchar *destination_string)
 
 	fclose(data);
 
-	if (sizeof(destination_hash) != EVP_MAX_MD_SIZE && LG_VERBOSE == 1) {
-		errlog("in hash_file()");
-		errlog("destination hash is invalid size");
-		errlog("ensure hash is declared with size EVP_MAX_MD_SIZE");
-		return 5;
-	}
-	else if (sizeof(destination_hash) != EVP_MAX_MD_SIZE) {
-		return 5;
-	}
-
+	uchar hash[EVP_MAX_MD_SIZE];
 	uint hash_length;
 
-	if (EVP_DigestFinal_ex(context, destination_hash, &hash_length) != 1) {
+	if (EVP_DigestFinal_ex(context, hash, &hash_length) != 1) {
+		if (LG_VERBOSE == 1) {
+			errlog("in hash_file()");
+			errlog("error finalizing digest");
+		}
 		EVP_MD_CTX_free(context);
-		return 6;
+		return 5;
 	}
+	
+	EVP_MD_CTX_free(context);
+
+	return *hash;
 }

tests/Makefile

@@ -0,0 +1,9 @@
+#
+# Makefile
+#
+
+include ../config.mk
+
+all: unit-tests.c
+	$(CC) unit-tests.c -o test-suite -lcunit -lconfig ../build/libglacier.a -Wall -Wextra
+	./test-suite

tests/unit-tests.c

@@ -0,0 +1,53 @@
+/*
+ * 	unit-tests.c - Unit tests for libglacier
+ *
+ * 	This file is part of Glacier.
+ *
+ * 	Glacier is free software: you can redistribute it and/or modify it under the terms of the
+ * 	GNU General Public License as published by the Free Software Foundation, either
+ * 	version 3 of the License, or (at your option) any later version.
+ *
+ * 	Glacier is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
+ * 	without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
+ * 	PARTICULAR PURPOSE. See the GNU General Public License for more details.
+ *
+ * 	You should have received a copy of the GNU General Public License along with Glacier. If
+ * 	not, see <https://www.gnu.org/licenses/>.
+ */
+
+#include <stdio.h>
+#include <libconfig.h>
+#include <unistd.h>
+
+#include "../include/config.h"
+#include "../include/log.h"
+#include "../include/pkgops.h"
+#include "../include/runtime.h"
+#include "../include/security.h"
+
+#include <CUnit/Basic.h>
+
+void
+test_is_process_root(void)
+{
+	CU_ASSERT(is_process_root() == 0);
+
+	uid_t saved_uid = getuid();
+	setuid(0);
+	CU_ASSERT(is_process_root() == 1);
+
+	setuid((int)saved_uid);
+}
+
+int
+main()
+{
+	if (CUE_SUCCESS != CU_initialize_registry()) {
+		return CU_get_error();
+	}
+
+	CU_basic_set_mode(CU_BRM_VERBOSE);
+
+	CU_basic_run_tests();
+	return CU_get_error();
+}