v0.2.0-rc - implement basic integrity checking framework

Reviewed-on: #13

Makefile

@@ -1,40 +1,69 @@
+#
+# Makefile
+#
+
+IDIR = ./include
+BDIR = ./build
+SDIR = ./src
+TDIR = ./tests
+
 include config.mk
 
-COLOR_GREEN=\033[0;32m
-COLOR_BLUE=\033[0;34m
-COLOR_RESET=\033[0m
-
 all:
-	@echo "Run 'make test' for the test binary, or 'make lib' to generate a static library."
+	@echo "No make option specified."
 	@echo "Run 'make help' for a full list of options."
 
 help:
 	@echo "Make options for libglacier:"
 	@echo ""
 	@echo "lib   - generate the static library"
-	@echo "test  - generate a test binary"
+	@echo "install  - install the static library and header files to PREFIX"
 	@echo "clean - remove all generated files"
 
-test:
+deprecate:
+	@echo "[WARN]"
+	@echo "[WARN] This rule has been deprecated, proceed with caution."
+	@echo "[WARN]"
+
+test: deprecate
 	$(CC) libglacier.c $(LIBFLAGS) -o libglacier.test
 	cp etc/example.cfg ./glacier.cfg
 
-lib:
+lib: $(SDIR)/libglacier.c
 	mkdir build
 	mkdir build/lib
-	$(CC) libglacier.c -c $(LIBFLAGS) -o build/lib/libglacier.o
+	$(CC) $(SDIR)/libglacier.c -c $(LIBFLAGS) -o $(BDIR)/lib/libglacier.o
-	$(AR) -rc build/lib/libglacier.a build/lib/libglacier.o
+	$(AR) -rc $(BDIR)/lib/libglacier.a build/lib/libglacier.o
 
-install:
+check: lib $(BDIR) $(TDIR)/unit-tests.c
-	@echo "$(COLOR_BLUE)[i]$(COLOR_RESET) Installing static library to $(PREFIX)/lib..."
+	$(CC) tests/unit-tests.c -o tests/test-suite -lcunit -Wall -Wextra build/lib/libglacier.a $(LIBFLAGS)
-	install lib/libglacier.a $(PREFIX)/lib
+	tests/test-suite
-	install include/config.h $(PREFIX)/include/glacier
+
-	install include/data.h $(PREFIX)/include/glacier
+install_lib: $(BDIR)/lib/libglacier.a
-	install include/log.h $(PREFIX)/include/glacier
+	@echo "[INFO]"
-	install include/pkgops.h $(PREFIX)/include/glacier
+	@echo "[INFO] Installing library to PREFIX/lib..."
-	install include/runtime.h $(PREFIX)/include/glacier
+	@echo "[INFO]"
-	install include/security.h $(PREFIX)/include/glacier
+	install $(BDIR)/lib/libglacier.a $(PREFIX)/lib
-	@echo "$(COLOR_GREEN)[*]$(COLOR_RESET) Finished installing static library to $(PREFIX)/lib."
+
+install_head: $(IDIR)/config.h $(IDIR)/data.h $(IDIR)/log.h $(IDIR)/pkgops.h $(IDIR)/runtime.h $(IDIR)/security.h
+	@echo "[INFO]"
+	@echo "[INFO] Installing header files to PREFIX/include/glacier..."
+	@echo "[INFO]"
+	mkdir -p $(PREFIX)/include/glacier
+	install $(IDIR)/config.h -t $(PREFIX)/include/glacier -m 644
+	install $(IDIR)/data.h -t $(PREFIX)/include/glacier -m 644
+	install $(IDIR)/log.h -t $(PREFIX)/include/glacier -m 644
+	install $(IDIR)/pkgops.h -t $(PREFIX)/include/glacier -m 644
+	install $(IDIR)/runtime.h -t $(PREFIX)/include/glacier -m 644
+	install $(IDIR)/security.h -t $(PREFIX)/include/glacier -m 644
+
+install: install_lib install_head
+	@echo "[INFO]"
+	@echo "[INFO] Finished installing library and header files to PREFIX."
+	@echo "[INFO]"
 
 clean:
-	rm -rf build
+	rm -rf $(BDIR) ./chroot
+
+distclean:
+	rm -rf $(BDIR) $(TDIR)/test-suite ./chroot

VERSION

@@ -1 +1 @@
-4.0.0-rc7
+0.2.0-rc

chroot-utils/build_in_chroot.sh

@@ -0,0 +1,29 @@
+#!/bin/bash
+
+#
+# 	build_in_chroot.sh - Build libglacier and install it in a simple chroot
+#
+# 	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/>.
+#
+
+init_chroot() {
+	mkdir -v ./chroot
+	cd ./chroot
+	git clone https://gitlab.com/buildroot.org/buildroot.git
+	cd buildroot
+	cp ../../SAVED_CONFIG ./.config
+	make -j$(nproc)
+}
+
+init_chroot "$@"

config.mk

@@ -5,6 +5,6 @@
 CC = /bin/gcc
 AR = /bin/ar
 
-LIBFLAGS = -lconfig
+LIBFLAGS = -lconfig -lcrypto
 
 PREFIX = /usr

etc/make.conf

@@ -0,0 +1,21 @@
+#
+# make.conf
+# The settings defined in this file will be loaded when 'make' is called during a Glacier operation.
+# For more information on this file, see https://www.everestlinux.org/docs/intro-to-glacier
+#
+
+# Number of parallel makejobs. By default this is set by nproc and should be optimal for your system.
+MAKEFLAGS="-j$(nproc)"
+
+# Build and compile flags for C and C++ programs.
+# Using too many build flags will break packages. Disable these if packages are breaking.
+CFLAGS="-O2"
+CXXFLAGS="${CFLAGS}"
+
+# Treat all warnings as errors
+# Not recommended, as many packages with larger codebases may refuse to compile.
+#CFLAGS="-Werror"
+
+# Prefix for packages to be installed.
+# Not all packages will honor this.
+PREFIX="/usr"

include/config.h

@@ -1,5 +1,5 @@
 /*
- * 	config.h - Function declarations for libglacier
+ * 	config.h - Config loading for Glacier
  *
  * 	This file is part of Glacier.
  *
@@ -18,83 +18,75 @@
 #ifndef GLACIERCONFIG_H_
 #define GLACIERCONFIG_H_
 
+#include <libconfig.h>
+
+/* Constants */
+#ifndef LG_VERBOSE
+#define LG_VERBOSE 0
+#endif
+
 /*
  * init_config
- * DESCRIPTION: Init_config initializes the libconfig library, so it can read the required runtime files
- * PARAMETERS:
- * 		None. (void)
- * RETURN VAUES:
- * 		0 on success, EXIT_FAILURE on failure
- * CAVEATS:
- * 		None.
- * EXAMPLE:
- * 		// It is best practice to check for ALL non-zero return values, rather than specific ones,
- *		// as init_config() returns EXIT_FAILURE
  *
- * 		if (init_config() != 0) {
+ * DESCRIPTION: Initialize libconfig with required configs
- * 			errlog("Failed to initialize libconfig");
+ * PARAMETERS:
- * 			return(EXIT_FAILURE); // fatal error requiring termination of program execution
+ * 		None.
- * 		}
+ * RETURN VALUES:
- * 		else {
+ * 		0 on success, 1 on failure
- * 			successlog("Initialized libconfig"); // output automatically if LG_VERBOSE = 1
+ * CAVEATS:
- * 		}
+ * 		This MUST be called before ANY other config function is.
+ * EXAMPLE:
+ * 		init_config();
  */
 
 int init_config(void);
 
-/**************************************************************************************************************/
-
 /*
  * die_config
- * DESCRPTION: Die_config destroys the loaded libconfig library.
- * PARAMETERS:
- * 		None. (void)
- * RETURN VALUES:
- * 		EXIT_SUCCESS on success
- * CAVEATS:
- * 		None.
- * EXAMPLE:
- * 		// die_config() is unlikely to fail unless you tried to destroy an invalid object,
- * 		// so checking for non-zero return values is unnecessary
  *
+ * DESCRIPTION: Die_config brings down libconfig gracefully.
+ * PARAMETERS:
+ * 		None.
+ * RETURN VALUES:
+ * 		0 on success, 1 on failure
+ * CAVEATS:
+ * 		This MUST be called after ALL other config functions have completed.
+ * EXAMPLE:
  * 		die_config();
  */
 
 int die_config(void);
 
-/**************************************************************************************************************/
-
 /*
  * load_all_from_config
- * DESCRIPTION: Initialize all settings from glacier.cfg.
+ *
+ * DESCRIPTION: load_all_from_config loads all settings from the config file.
  * PARAMETERS:
- * 		None. (void)
+ * 		None.
  * RETURN VALUES:
- * 		0 on success, 1 on file does not exist, 2 on library error
+ * 		0 on success, 1 on failure
  * CAVEATS:
  * 		None.
  * EXAMPLE:
  * 		load_all_from_config();
  */
 
-int load_all_from_config();
+int load_all_from_config(void);
-
-/**************************************************************************************************************/
 
 /*
- * [[[ DEPRECATED ]]]
+ * load_all_from_profile
- * load_setting_from_config
+ *
- * DESCRIPTION: Initialize a specified from glacier.cfg.
+ * DESCRIPTION: load_all_from_profile loads all settings from the profile file.
  * PARAMETERS:
- * 		char SETTING[] -> The setting to initialize
+ * 		None.
  * RETURN VALUES:
- * 		0 on success, 1 on setting not found, 2 on file does not exist, 3 on library error
+ * 		0 on success, 1 on failure
  * CAVEATS:
  * 		None.
  * EXAMPLE:
- * 		load_setting_from_config();
+ * 		load_all_from_profile();
  */
 
-/* int load_setting_from_config(char SETTING[]); */
+int load_all_from_profile(void);
 
 #endif

include/data.h

@@ -18,6 +18,23 @@
 #ifndef GLACIERDATA_H_
 #define GLACIERDATA_H_
 
+#include <stdbool.h>
+
+/* Maximum number of children a node can have */
+#define MAX_CHILDREN 64
+
+/* Maximum recursion depth for tree operations */
+#define MAX_RECURSION_DEPTH 100
+
+/* Node structure definition */
+struct node {
+	char *data;
+	struct node *children[MAX_CHILDREN];
+	int numChildren;
+	struct node *left;
+	struct node *right;
+};
+
 /*
  * create_node
  *
@@ -25,16 +42,30 @@
  * PARAMETERS:
  * 		char *data -> The name of the node to create
  * RETURN VALUES:
- * 		None.
+ * 		A pointer to the created node on success, NULL on failure
  * CAVEATS:
- * 		None.
+ * 		Caller must free the node using free_node when done
  * EXAMPLE:
- * 		struct node package = create_node("Package");
+ * 		struct node *package = create_node("Package");
  */
 
 struct node *create_node(char *data);
 
-/**************************************************************************************************************/
+/*
+ * free_node
+ *
+ * DESCRIPTION: Free_node recursively frees all memory allocated for a node and its children.
+ * PARAMETERS:
+ * 		struct node *root -> The root node to free
+ * RETURN VALUES:
+ * 		None.
+ * CAVEATS:
+ * 		Will free all child nodes recursively.
+ * EXAMPLE:
+ * 		free_node(package);
+ */
+
+void free_node(struct node *root);
 
 /*
  * add_child
@@ -44,113 +75,30 @@ struct node *create_node(char *data);
  * 		struct node *parent -> The parent node which the child will be added to
  * 		struct node *child  -> The child node which will be added to the parent node
  * RETURN VALUES:
- * 		1 on maximum children exceeded
+ * 		0 on success, 1-3 for different error conditions
  * CAVEATS:
  * 		None.
  * EXAMPLE:
  * 		add_child(package, dep1);
  */
 
-void add_child(struct node *parent, struct node *child);
+int add_child(struct node *parent, struct node *child);
-
-/**************************************************************************************************************/
 
 /*
  * print_tree
  *
- * DESCRIPTION: Print_tree prints a dependency tree specified at its root node
+ * DESCRIPTION: Print_tree prints a dependency tree specified at its root node.
  * PARAMETERS:
  * 		struct node *root -> The tree to print
  * 		int level	  -> The number of levels to descend
  * RETURN VALUES:
- * 		None.
+ * 		0 on success, non-zero on error
  * CAVEATS:
  * 		None.
  * EXAMPLE:
  * 		print_tree(package, 0);
  */
 
-void print_tree(struct node *root, int level);
+int print_tree(struct node *root, int level);
-
-/**************************************************************************************************************/
-
-/*
- * init_queue
- *
- * DESCRIPTION: Init_queue initializes a queue data structue.
- * PARAMETERS:
- * 		queue *q -> The name of the queue to initialize
- * RETURN VALUES:
- * 		None.
- * CAVEATS:
- * 		None.
- * EXAMPLE:
- * 		init_queue("operation_queue");
- */
-
-void init_queue(queue *q);
-
-/**************************************************************************************************************/
-
-/*
- * queue_is_empty
- *
- * DESCRIPTION: Queue_is_empty checks if queue *q is empty
- * PARAMETERS:
- * 		queue *q -> The queue to check
- * RETURN VALUES:
- * 		true on empty, false on not empty
- * CAVEATS:
- * 		None.
- * EXAMPLE:
- * 		if (queue_is_empty(q)) {
- * 			printf("Queue is empty\n");
- * 			return;
- * 		}
- */
-
-bool queue_is_empty(queue *q);
-
-/**************************************************************************************************************/
-
-/*
- * queue_is_full
- *
- * DESCRIPTION: Queue_is_full checks if queue *q is full 
- * PARAMETERS:
- * 		queue *q -> The queue to check
- * RETURN VALUES:
- * 		true on full, false on not full
- * CAVEATS:
- * 		None.
- * EXAMPLE:
- * 		if (queue_is_full(q)) {
- * 			printf("Queue is full\n");
- * 			return;
- * 		}
- */
-
-bool queue_is_full(queue *q);
-
-/**************************************************************************************************************/
-
-/*
- * enqueue
- *
- * DESCRIPTION: Enqueue enqueues an element at the back of the queue
- * PARAMETERS:
- * 		queue *q -> The queue to enqueue to
- * 		int value -> 
- * RETURN VALUES:
- * 		true on full, false on not full
- * CAVEATS:
- * 		None.
- * EXAMPLE:
- * 		if (queue_is_full(q)) {
- * 			printf("Queue is full\n");
- * 			return;
- * 		}
- */
-
 
 #endif

include/globals.h

@@ -18,16 +18,35 @@
 #ifndef GLOBALS_H_
 #define GLOBALS_H_
 
+#include <libconfig.h>
+#include <stdio.h>
+
+/* Constants */
+#define BUFFER_SIZE 1024
+#define MAX_SIZE 256
+
+/* libconfig context */
 extern config_t cfg;
 extern config_setting_t *setting;
-extern const char str;
 
+/* Configuration variables */
+extern int GLACIER_ALLOW_SERVICES;
+extern char *GLACIER_ALLOWED_LICENSES;
+extern int GLACIER_DO_INT_CHECK;
+extern int GLACIER_VERBOSE;
+
+/* Profile variables */
 extern const char *GLACIER_REPO;
 extern const char *GLACIER_ARCH;
 extern const char *GLACIER_TARGET;
 extern const char *GLACIER_LOCALDB;
 extern const char *GLACIER_SYSTEM_PROFILE;
 
-const char *runtime_files[];
+/* Required runtime files */
+extern const char *runtime_files[];
+
+/* File pointers for hashing operations */
+extern FILE *expected_hash;
+extern FILE *pkg;
 
 #endif

include/pkgops.h

@@ -18,6 +18,12 @@
 #ifndef GLACIERPKGOPS_H_
 #define GLACIERPKGOPS_H_
 
+/* Permission constant for workspace directory creation */
+#define DEFAULT_PERMISSIONS 0750
+
+/* Maximum size for path buffers */
+#define PATH_MAX_SIZE 512
+
 /*
  * mkworkspace
  *
@@ -25,14 +31,14 @@
  * PARAMETERS:
  * 		None.
  * RETURN VAUES:
- * 		0 on success, 2 on library error
+ * 		0 on workspace already exists, 1 on workspace created, -1 on error
  * CAVEATS:
  * 		None.
  * EXAMPLE:
  * 		mkworkspace();
  */
 
-int mkworkspace();
+int mkworkspace(void);
 
 /*
  * prepare_pkg
@@ -41,7 +47,7 @@ int mkworkspace();
  * PARAMETERS:
  * 		char PACKAGE[] -> The package file to prepare
  * RETURN VAUES:
- * 		0 on success, 1 on package does not exist, or error untarring
+ * 		0 on success, 1 on package does not exist or error, other values for specific errors
  * CAVEATS:
  * 		The example presented is bad. You should be calling the system profile variable
  * 		rather than manually specifying one.
@@ -58,7 +64,7 @@ int prepare_pkg(char PACKAGE[]);
  * PARAMETERS:
  * 		char TASK[] -> The make task to run
  * RETURN VAUES:
- * 		0 on success, 1 on failure
+ * 		0 on success, other values for specific errors
  * CAVEATS:
  * 		MUST be run after prepare_pkg(), or else errors will occur
  * 		Same caveat as above. Do not manually specify the system profile, use its variable.

include/security.h

@@ -18,6 +18,9 @@
 #ifndef GLACIERSECURITY_H_
 #define GLACIERSECURITY_H_
 
+typedef unsigned int uint;
+typedef unsigned char uchar;
+
 /*
  * compare_file_hash
  *
@@ -33,6 +36,63 @@
  * 		compare_file_hash("pkg.sha256sum", "pkg.tar.xz");
  */
 
-int compare_file_hash(char ORIG_HASH[], char FILE[]);
+/* int compare_file_hash(char ORIG_HASH[], char FILE[]); */
+
+/*
+ * hash_file
+ *
+ * DESCRIPTION: Performs a hashing operation on a file and stores the result
+ * PARAMETERS:
+ *      const char *filename -> The file to hash
+ *      unsigned char *out_hash -> Buffer to store the resulting hash
+ *      unsigned int *out_length -> Will contain the length of the hash
+ * RETURN VALUES:
+ *      0 on success, other values for specific errors
+ * CAVEATS:
+ *      out_hash buffer must be large enough to hold the hash (EVP_MAX_MD_SIZE recommended)
+ * EXAMPLE:
+ *      unsigned char hash[EVP_MAX_MD_SIZE];
+ *      unsigned int hash_len;
+ *      hash_file("file.txt", hash, &hash_len);
+ */
+
+int hash_file(const char *filename, unsigned char *out_hash, unsigned int *out_length);
+
+/*
+ * print_hash
+ *
+ * DESCRIPTION: Prints a specified hash string to stdout
+ * PARAMETERS:
+ *      unsigned char *hash -> The hash to print
+ *      unsigned int length -> Length of the hash
+ * RETURN VALUES:
+ *      0 on success, 1 on error
+ * CAVEATS:
+ *      None
+ * EXAMPLE:
+ *      print_hash(hash, hash_len);
+ */
+
+int print_hash(uchar *hash, uint length);
+
+/*
+ * stash_hash
+ *
+ * DESCRIPTION: Stores a hash inside a string as hexadecimal representation
+ * PARAMETERS:
+ *      char *stored_hash -> Buffer to store the resulting hash string
+ *      unsigned int stored_hash_size -> Size of the stored_hash buffer
+ *      const uchar *hash -> The hash to convert to string
+ *      uint length -> Length of the hash
+ * RETURN VALUES:
+ *      0 on success, 1 on error
+ * CAVEATS:
+ *      stored_hash buffer must be at least (length*2)+1 bytes in size
+ * EXAMPLE:
+ *      char hash_str[65]; // 32 bytes SHA-256 = 64 hex chars + null terminator
+ *      stash_hash(hash_str, sizeof(hash_str), hash, hash_len);
+ */
+
+int stash_hash(char *stored_hash, unsigned int stored_hash_size, const uchar *hash, uint length);
 
 #endif

libglacier.c

@@ -1,679 +0,0 @@
-/*
- * 	libglacier.c - Backend C library for Glacier
- *
- * 	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 <color.h>
-#include <dirent.h>
-#include <errno.h>
-#include <libconfig.h>
-#include <locale.h>
-#include <openssl/sha.h>
-#include <stdbool.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include <sys/stat.h>
-#include <sys/types.h>
-#include <unistd.h>
-#include <wchar.h>
-
-#include "config.h"
-#include "include/globals.h"
-
-#define BUFFER_SIZE 1024
-#define MAX_CHILDREN 64
-#define MAX_SIZE 256
-
-/* Global variables */
-
-config_t cfg;
-config_setting_t *setting;
-const char str;
-
-int GLACIER_ALLOW_SERVICES;
-char GLACIER_ALLOWED_LICENSES;
-int GLACIER_DO_INT_CHECK;
-int GLACIER_VERBOSE;
-
-const char *GLACIER_REPO;
-const char *GLACIER_ARCH;
-const char *GLACIER_TARGET;
-const char *GLACIER_LOCALDB;
-const char *GLACIER_SYSTEM_PROFILE;
-
-const char *runtime_files[] = { 
-	"/etc/glacier.cfg",
-	"/etc/glacier/call-hooks",
-	"/etc/make.conf"
-	};
-
-struct node {
-	char *data;
-	struct node *children[MAX_CHILDREN];
-	int numChildren;
-};
-
-FILE *expected_hash;
-FILE *pkg;
-
-/*
- * infolog
- *
- * DESCRIPTION: Output a stylized info message.
- * PARAMETERS: char MSG[]
- * DEFINED IN: glacier_log.h
- *
- */
-
-void
-infolog(char MSG[])
-{
-	if (MSG == NULL) {
-		return;
-	}
-
-	printf(COL_BLUE "[i]" COL_RESET " %s\n", MSG);
-	return;
-}
-
-/*
- * warnlog
- *
- * DESCRIPTION: Output a stylized warning message.
- * Parameters: char MSG[]
- * DEFINED IN: glacier_log.h
- *
- */
-
-void
-warnlog(char MSG[])
-{
-	if (MSG == NULL) {
-		return;
-	}
-
-	printf(COL_YELLOW "[!]" COL_RESET " %s\n", MSG);
-	return;
-}
-
-/*
- * errlog
- * 
- * DESCRIPTION: Output a stylized error message.
- * PARAMETERS: char MSG[]
- * DEFINED IN: glacier_log.h
- *
- */
-
-void
-errlog(char MSG[])
-{
-	if (MSG == NULL) {
-		return;
-	}
-
-	fprintf(stderr, COL_RED "[x]" COL_RESET " %s\n", MSG);
-	return;
-}
-
-/*
- * successlog
- * 
- * DESCRIPTION: Output a stylized success message.
- * PARAMETERS: char MSG[]
- * DEFINED IN: glacier_log.h
- *
- */
-
-void
-successlog(char MSG[])
-{
-	if (MSG == NULL) {
-		return;
-	}
-
-	printf(COL_GREEN "[*]" COL_RESET " %s\n", MSG);
-	return;
-}
-
-/*
- * runtime_exists
- *
- * DESCRIPTION: Check if necesary runtime files exist.
- * PARAMETERS: None.
- * DEFINED IN: glacier_runtime.h
- *
- */
-
-int
-runtime_exists(void)
-{
-	int f;
-
-	for (f = 0; f < sizeof(runtime_files); f++) {
-		if (access(runtime_files[f], F_OK) == 0) {
-			continue;
-		} else {
-			/* might keep this message, might not, idk */
-			/* errlog("Runtime files are missing, cannot continue with operation.");
-			printf(COL_RED "[x]" COL_RESET " The following files are missing:\n");
-			printf(COL_RED "[x]" COL_RESET " \t%s\n", runtime_files[f]); */
-			return 0;
-		}
-	}
-	return 1;
-}
-
-/*
- * is_process_root
- *
- * DESCRIPTION: Check if process is running as root.
- * PARAMETERS: char MSG[]
- * DEFINED IN: glacier_runtime.h
- *
- */
-
-int
-is_process_root(void)
-{
-	if (getuid() != 0) {
-		return 0; /* process is not running as root */
-	}
-	else {
-		return 1; /* process is running as root */
-	}
-}
-
-/*
- * init_config
- *
- * DESCRIPTION: Initialize libconfig.
- * PARAMETERS: None.
- * DEFINED IN: glacier_config.h
- *
- */
-
-int
-init_config(void)
-{
-	config_init(&cfg);
-
-	if (! config_read_file(&cfg, runtime_files[0])) {
-		fprintf(stderr, "%s:%d - %s\n", config_error_file(&cfg),
-			config_error_line(&cfg), config_error_text(&cfg));
-		config_destroy(&cfg);
-		return(EXIT_FAILURE);
-	}
-
-	if (LG_VERBOSE == 1) {
-		infolog("Initialized libconfig");
-	}
-
-	return 0;
-}
-
-/*
- * die_config
- *
- * DESCRIPTION: Kill libconfig.
- * PARAMETERS: None.
- * DEFINED IN: glacier_config.h
- *
- */
-
-int
-die_config(void)
-{
-	config_destroy(&cfg);
-
-	if (LG_VERBOSE == 1) {
-		infolog("Destroyed libconfig");
-	}
-
-	return(EXIT_SUCCESS);
-}
-
-/*
- * load_all_from_config
- *
- * DESCRIPTION: Loads all settings from the Glacier config file.
- * PARAMETERS: None.
- * DEFINED IN: glacier_config.h
- *
- */
-
-int
-load_all_from_config(void)
-{
-	config_lookup_bool(&cfg, "GLACIER_DO_INT_CHECK", &GLACIER_DO_INT_CHECK);
-	config_lookup_bool(&cfg, "GLACIER_VERBOSE", &GLACIER_VERBOSE);
-	
-	config_lookup_string(&cfg, "GLACIER_REPO", 	     &GLACIER_REPO);
-	config_lookup_string(&cfg, "GLACIER_ARCH",           &GLACIER_ARCH);
-	config_lookup_string(&cfg, "GLACIER_TARGET", 	     &GLACIER_TARGET);
-	config_lookup_string(&cfg, "GLACIER_SYSTEM_PROFILE", &GLACIER_SYSTEM_PROFILE);
-}
-
-/* issues with this idk
-int
-load_all_from_config()
-{
-	if(config_lookup_bool(&cfg, "GLACIER_ALLOW_SERVICES", &GLACIER_ALLOW_SERVICES))
-		printf("Services allowed: %s\n", GLACIER_ALLOW_SERVICES ? "true" : "false");
-	else
-		warnlog("GLACIER_SERVICES_ALLOWED is not defined in glacier.cfg.");
-
-	if(config_lookup_bool(&cfg, "GLACIER_DO_INT_CHECK", &GLACIER_DO_INT_CHECK))
-		printf("Integrity checking enabled: %s\n", GLACIER_DO_INT_CHECK ? "true" : "false");
-	else
-		warnlog("GLACIER_DO_INT_CHECK is not defined in glacier.cfg.");
-
-	if(config_lookup_bool(&cfg, "GLACIER_VERBOSE", &GLACIER_VERBOSE))
-		printf("Verbose logging: %s\n", GLACIER_VERBOSE ? "true" : "false");
-	else
-		warnlog("GLACIER_VERBOSE is not defined in glacier.cfg.");
-}
-*/
-
-/*
- * load_setting_from_config
- *
- * DESCRIPTION: Load a specified setting from the Glacier config file.
- * PARAMETERS: char SETTING[]
- * DEFINED IN: glacier_config.h
- *
- */
-
-/* int
-load_setting_from_config(char SETTING[])
-{} */
-
-/*
-* create_node
-*
-* DESCRIPTION: Create a dependency tree node.
-* PARAMETERS: char *data
-* DEFINED IN: glacier_data.h
-*
-*/
-
-struct node
-*create_node(char *data)
-{
-	struct node *newNode = (struct node*)malloc(sizeof(struct node));
-	newNode->data 	     = strdup(data);
-	newNode->numChildren = 0;
-	return newNode;
-}
-
-/*
- * add_child
- *
- * DESCRIPTION: Add a child node to a parent node.
- * PARAMETERS: struct node *parent, struct node *child
- * DEFINED IN: glacier_data.h
- *
- */
-
-void
-add_child(struct node *parent, struct node *child)
-{
-	if (parent->numChildren < MAX_CHILDREN) {
-		parent->children[parent->numChildren++] = child;
-	} else {
-		if (LG_VERBOSE == 1) { errlog("Maximum number of children exceeded"); }
-		exit(1);
-	}
-}
-
-/*
-* print_tree
-*
-* DESCRIPTION: Print a dependency tree.
-* PARAMETERS: struct node *root, int level
-* DEFINED IN: glacier_data.h
-*
-*/
-
-void
-print_tree(struct node *root, int level)
-{
-	if (root == NULL) {
-		return;
-	}
-
-	for (int i = 0; i < level; i++) {
-		printf("	");
-	}
-
-	printf("%s\n", root->data);
-
-	for (int i = 0; i < root->numChildren; i++) {
-		print_tree(root->children[i], level + 1);
-	}
-}
-
-/* Definition of queue data type */
-typedef struct {
-	int items[MAX_SIZE];
-	int front;
-	int rear;
-} queue;
-
-/*
-* init_queue
-*
-* DESCRIPTION: Initialize a queue.
-* PARAMETERS: queue *q
-* DEFINED IN: glacier_data.h
-*
-*/
-
-void
-init_queue(queue *q)
-{
-	q -> front = -1;
-	q -> rear = 0;
-}
-
-/*
-* queue_is_empty
-*
-* DESCRIPTION: Check if queue is empty.
-* PARAMETERS: struct node *root, int level
-* DEFINED IN: glacier_data.h
-*
-*/
-
-bool queue_is_empty(queue *q) { return (q -> front == q -> rear -1); }
-
-/*
-* queue_is_full
-*
-* DESCRIPTION: Check if queue is full.
-* PARAMETERS: queue *q
-* DEFINED IN: glacier_data.h
-*
-*/
-
-bool queue_is_full(queue *q) { return (q -> rear == MAX_SIZE); }
-
-/*
-* enqueue
-*
-* DESCRIPTION: Enqueue an element at the back of the queue.
-* PARAMETERS: queue *q, int value
-* DEFINED IN: glacier_data.h
-*
-*/
-
-void
-enqueue (queue *q, int value)
-{
-	if (queue_is_full(q)) {
-		printf("Queue is full\n");
-		return;
-	}
-	
-	q -> items[q -> rear] = value;
-	q -> rear++;
-}
-
-/*
-* dequeue
-*
-* DESCRIPTION: Dequeue the element at the front of the queue.
-* PARAMETERS: queue *q, int value
-* DEFINED IN: glacier_data.h
-*
-*/
-
-void
-dequeue(queue *q)
-{
-	if (queue_is_empty(q)) {
-		printf("Queue is empty\n");
-		return;
-	}
-
-	q -> front++;
-}
-
-/*
-* peek
-*
-* DESCRIPTION: View the element at the front of the queue.
-* PARAMETERS: struct node *root, int level
-* DEFINED IN: glacier_data.h
-*
-*/
-
-int
-peek(queue *q)
-{
-	if (queue_is_empty(q)) {
-		printf("Queue is empty\n");
-		return -1;
-	}
-
-	return q -> items[q -> front + 1];
-}
-
-/*
-* print_queue
-*
-* DESCRIPTION: Print the queue.
-* PARAMETERS: queue *q
-* DEFINED IN: glacier_data.h
-*
-*/
-
-void
-print_queue(queue *q)
-{
-	if (queue_is_empty(q)) {
-		printf("Queue is empty\n");
-		return;
-	}
-
-	printf("Current Queue: ");
-	
-	for (int i = q -> front + 1; i < q -> rear; i++) {
-		printf("%d ", q -> items[i]);
-	}
-	printf("\n");
-}
-
-/*
- * mkworkspace
- *
- * DESCRIPTION: Creates a new Glacier workspace in /tmp.
- * PARAMETERS: None.
- * DEFINED IN: glacier_pkgops.h
- *
- */
-
-int
-mkworkspace(void)
-{
-	DIR* workspace = opendir("/tmp/glacier-workspace");
-	if (workspace) {
-		/* infolog("Not creating new workspace, valid workspace already exists."); */
-		return 0;
-	} else if (ENOENT == errno) {
-		/* infolog("Creating new Glacier workspace..."); */
-		mkdir("/tmp/glacier-workspace", 0777);
-		return 1;
-	} else {
-		if (LG_VERBOSE == 1) {
-			errlog("in mkworkspace()");
-			errlog("mkdir() failed to run");
-		}
-		return -1;
-	}
-}
-
-/*
- * prepare_pkg
- *
- * DESCRIPTION: Copies a package archive from the localdb to the workspace, and unpacks it.
- * PARAMETERS: char PACKAGE[]
- * DEFINED IN: glacier_pkgops.h
- *
- */
-
-
-int
-prepare_pkg(char PACKAGE[])
-{
-	if (PACKAGE == NULL) {
-		printf(COL_RED "[x] " COL_RESET "Package '%s' does not exist in the local database.\n", PACKAGE);
-		errlog("Ensure your local database is up to date and try again.");
-		errlog("This can be done by running 'glacier-update-pkgdb' as root.");
-		return 1;
-	} else {
-		char PKG_NEW[512];
-		strcat(PKG_NEW, "/tmp/glacier-workspace/");
-		strcat(PKG_NEW, PACKAGE);
-		strcat(PKG_NEW, ".tar");
-		FILE *pkg_old, *pkg_new;
-		char filename[100], contents;
-
-		pkg_old = fopen(PACKAGE, "r");
-		pkg_new = fopen(PKG_NEW, "a+");
-
-		contents = fgetc(pkg_old);
-
-		while (contents != EOF) {
-			fputc(contents, pkg_new);
-			contents = fgetc(pkg_old);
-		}
-
-		fclose(pkg_old);
-		fclose(pkg_new);
-		char *tar_args[] = {
-			"/bin/tar", /* This should be changed to /glacier/bin/tar later on */
-			"-xvf",
-			PKG_NEW,
-			NULL,
-		};
-
-		execvp(
-			"/bin/tar", /* Above comment applies here */
-			tar_args
-		);
-		if (errno != 0) {
-			printf(COL_RED "[x] " COL_RESET "Error while unpacking archive for package %s.\n", PACKAGE);
-			return errno;
-		}
-		remove(PKG_NEW);
-		char pkg_dir[512];
-		strcat(pkg_dir, "/tmp/glacier-workspace/");
-		strcat(pkg_dir, PACKAGE);
-		chdir(pkg_dir);
-	}
-}
-
-/* download_package_sources() is deprecated and will be removed in a later release. */
-
-/* int
-download_package_sources(char PACKAGE[])
-{
-	printf(COL_BLUE "[i] " COL_RESET "Downloading package archive for %s...\n", PACKAGE);
-	if (GLACIER_SYSTEM_PROFILE == "x86-musl") {
-		execl("/glacier/tools/wget", "https://git.everestlinux.org/EverestLinux/epkgs-x86-musl/", NULL);
-	} else {
-		printf(COL_RED "[x] " COL_RESET "System profile '%s' is not supported.\n", GLACIER_SYSTEM_PROFILE);
-	}
-} */
-
-void
-TEST_chdir(char dir[])
-{
-	char *buf;
-	chdir(dir);
-	buf = (char *) malloc(100*sizeof(char));
-	getcwd(buf, 100);
-	printf("%s\n", buf);
-}
-
-/*
- * run_make_task
- *
- * DESCRIPTION: Runs a make task in current working directory 
- * PARAMETERS: char TASK[]
- * DEFINED IN: glacier_pkgops.h
- *
- */
-
-int
-run_make_task(char TASK[])
-{
-	char *build_args[] = {
-		"/bin/make", /* This should be changed to /glacier/bin/make later on */
-		TASK,
-		NULL
-	};
-
-	execvp(
-		"/bin/make", /* Above comment applies here */
-		build_args
-	);
-	if (errno != 0) {
-		errlog("An error occurred while running the make task.");
-		return errno;
-	}
-}
-
-/*
- * compare_file_hash
- *
- * DESCRIPTION: Compare two file hashes
- * PARAMETERS: char ORIG_HASH[], char FILE[]
- * DEFINED IN: glacier_security.h
- *
- */
-
-int
-compare_file_hash(char ORIG_HASH[], char FILE[])
-{
-	FILE *pkg;
-
-	pkg = fopen(FILE, "rb");
-	if (pkg == NULL) {
-		return -1;
-	}
-
-	unsigned char hash[SHA256_DIGEST_LENGTH];
-	SHA256_CTX sha256;
-
-	SHA256_Init(&sha256);
-
-	const int hashBufferSize = 1024;
-	unsigned char hashBuffer[hashBufferSize];
-	int bytesRead;
-
-	while ((byesRead = fread(hashBuffer, 1, hashBufferSize, pkg)) != 0) {
-		SHA256_Update(&sha256, hashBuffer, bytesRead);
-	}
-	
-	SHA256_Final(hash, &sha256);
-	fclose(pkg);
-
-	for (int i = 0; i < SHA256_DIGEST_LENGTH; i++) {
-		printf("%02x", hash[i]);
-	}
-}

pkg/run-pkg.c

@@ -1,27 +0,0 @@
-#include <errno.h>
-#include <stdio.h>
-#include <unistd.h>
-
-int
-run_make_task(char task[])
-{
-	char *build_args[] = {
-		"/bin/make",
-		task,
-		NULL
-	};
-
-	execvp(
-		"/bin/make",
-		build_args
-	);
-	if (errno != 0 ) {
-		return errno;
-	}
-}
-
-int
-main()
-{
-	run_make_task("help");
-}

src/config.h

@@ -0,0 +1,27 @@
+/*
+ * 	config.h - Various compile-time settings 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/>.
+ */
+
+#ifndef CONFIG_H_
+#define CONFIG_H_
+
+/* LG_VERBOSE - whether to use verbose logging for library events or not
+ *
+ * 0 is false, 1 is true
+ */
+#define LG_VERBOSE 0
+
+#endif

src/libglacier.c

@@ -0,0 +1,851 @@
+/*
+ * 	libglacier.c - Backend C library for Glacier
+ *
+ * 	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 <color.h>
+#include <dirent.h>
+#include <errno.h>
+#include <libconfig.h>
+#include <locale.h>
+#include <openssl/evp.h>
+#include <stdbool.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <sys/wait.h>
+#include <unistd.h>
+#include <wchar.h>
+
+#include "config.h"
+
+/* Buffer and size constants */
+#define BUFFER_SIZE 1024
+#define MAX_CHILDREN 64
+#define MAX_SIZE 256
+#define PATH_MAX_SIZE 512
+#define MAX_RECURSION_DEPTH 100
+#define DEFAULT_PERMISSIONS 0750
+
+/* Define LG_VERBOSE if not defined elsewhere */
+#ifndef LG_VERBOSE
+#define LG_VERBOSE 0
+#endif
+
+typedef unsigned int uint;
+typedef unsigned char uchar;
+
+/*
+ * Global Variables
+ * 
+ * Descriptions are given as comments after the variable declaration.
+ * DEFINED IN: globals.h
+ *
+ */
+
+config_t cfg; /* Context for libconfig */
+config_setting_t *setting = NULL; /* Pointer for setting */
+
+/* Configuration variables with default values */
+int GLACIER_ALLOW_SERVICES = 0; /* Declaration of GLACIER_ALLOW_SERVICES as given in glacier.cfg */
+char *GLACIER_ALLOWED_LICENSES = NULL; /* Declaration of GLACIER_ALLOWED_LICENSES as given in glacier.cfg */
+int GLACIER_DO_INT_CHECK = 1; /* Declaration of GLACIER_DO_INT_CHECK as given in glacier.cfg */
+int GLACIER_VERBOSE = 0; /* Declaration of GLACIER_VERBOSE as given in glacier.cfg */
+
+/* Profile variables */
+const char *GLACIER_REPO = NULL; /* Declaration of GLACIER_REPO as defined in profile.cfg */
+const char *GLACIER_ARCH = NULL; /* Declaration of GLACIER_ARCH as defined in profile.cfg */
+const char *GLACIER_TARGET = NULL; /* Declaration of GLACIER_TARGET as defined in profile.cfg */
+const char *GLACIER_LOCALDB = NULL; /* Declaration of GLACIER_LOCALDB as defined in profile.cfg */
+const char *GLACIER_SYSTEM_PROFILE = NULL; /* Declaration of GLACIER_SYSTEM_PROFILE as defined in profile.cfg */
+
+/* Required runtime files */
+const char *runtime_files[] = { 
+	"/etc/glacier.cfg",
+	"/etc/glacier/call-hooks",
+	"/etc/make.conf"
+	};
+
+FILE *expected_hash; /* File pointer for expected hash */
+FILE *pkg; /* File pointer for package hash */
+
+/*
+ * END GLOBAL VARIABLES
+ */
+
+/*
+ * node
+ *
+ * DESCRIPTION: Definition of node type.
+ * DEFINED IN: data.h
+ *
+ */
+
+struct node {
+	char *data;
+	struct node *children[MAX_CHILDREN];
+	int numChildren;
+	struct node *left;
+	struct node *right;
+};
+
+/*
+ * infolog
+ *
+ * DESCRIPTION: Output a stylized info message.
+ * PARAMETERS: char MSG[]
+ * DEFINED IN: log.h
+ *
+ */
+
+void
+infolog(char MSG[])
+{
+	if (MSG == NULL) {
+		return;
+	}
+
+	printf(COL_BLUE "[i]" COL_RESET " %s\n", MSG);
+	return;
+}
+
+/*
+ * warnlog
+ *
+ * DESCRIPTION: Output a stylized warning message.
+ * Parameters: char MSG[]
+ * DEFINED IN: log.h
+ *
+ */
+
+void
+warnlog(char MSG[])
+{
+	if (MSG == NULL) {
+		return;
+	}
+
+	printf(COL_YELLOW "[!]" COL_RESET " %s\n", MSG);
+	return;
+}
+
+/*
+ * errlog
+ * 
+ * DESCRIPTION: Output a stylized error message.
+ * PARAMETERS: char MSG[]
+ * DEFINED IN: log.h
+ *
+ */
+
+void
+errlog(char MSG[])
+{
+	if (MSG == NULL) {
+		return;
+	}
+
+	fprintf(stderr, COL_RED "[x]" COL_RESET " %s\n", MSG);
+	return;
+}
+
+/*
+ * successlog
+ * 
+ * DESCRIPTION: Output a stylized success message.
+ * PARAMETERS: char MSG[]
+ * DEFINED IN: log.h
+ *
+ */
+
+void
+successlog(char MSG[])
+{
+	if (MSG == NULL) {
+		return;
+	}
+
+	printf(COL_GREEN "[*]" COL_RESET " %s\n", MSG);
+	return;
+}
+
+/*
+ * runtime_exists
+ *
+ * DESCRIPTION: Check if necesary runtime files exist.
+ * PARAMETERS: None.
+ * DEFINED IN: runtime.h
+ *
+ */
+
+int
+runtime_exists(void)
+{
+	int f;
+
+	for (f = 0; f < sizeof(runtime_files); f++) {
+		if (access(runtime_files[f], F_OK) == 0) {
+			continue;
+		} else {
+			/* might keep this message, might not, idk */
+			/* errlog("Runtime files are missing, cannot continue with operation.");
+			printf(COL_RED "[x]" COL_RESET " The following files are missing:\n");
+			printf(COL_RED "[x]" COL_RESET " \t%s\n", runtime_files[f]); */
+			return 0;
+		}
+	}
+	return 1;
+}
+
+/*
+ * is_process_root
+ *
+ * DESCRIPTION: Check if process is running as root.
+ * PARAMETERS: char MSG[]
+ * DEFINED IN: runtime.h
+ *
+ */
+
+int
+is_process_root(void)
+{
+	if (getuid() != 0) {
+		return 0; /* process is not running as root */
+	}
+	else {
+		return 1; /* process is running as root */
+	}
+}
+
+/*
+ * init_config
+ *
+ * DESCRIPTION: Initialize libconfig.
+ * PARAMETERS: None.
+ * DEFINED IN: config.h
+ *
+ */
+
+int
+init_config(void)
+{
+	config_init(&cfg);
+
+	if (! config_read_file(&cfg, runtime_files[0])) {
+		fprintf(stderr, "%s:%d - %s\n", config_error_file(&cfg),
+			config_error_line(&cfg), config_error_text(&cfg));
+		config_destroy(&cfg);
+		return(EXIT_FAILURE);
+	}
+
+	if (LG_VERBOSE == 1) {
+		infolog("Initialized libconfig");
+	}
+
+	return 0;
+}
+
+/*
+ * die_config
+ *
+ * DESCRIPTION: Kill libconfig.
+ * PARAMETERS: None.
+ * DEFINED IN: config.h
+ *
+ */
+
+int
+die_config(void)
+{
+	config_destroy(&cfg);
+
+	if (LG_VERBOSE == 1) {
+		infolog("Destroyed libconfig");
+	}
+
+	return(EXIT_SUCCESS);
+}
+
+/*
+ * load_all_from_config
+ *
+ * DESCRIPTION: Loads all settings from the Glacier config file.
+ * PARAMETERS: None.
+ * DEFINED IN: config.h
+ *
+ */
+
+int
+load_all_from_config(void)
+{
+	/* this is probably really ugly but it works */
+	if (! config_lookup_bool(&cfg, "GLACIER_DO_INT_CHECK", &GLACIER_DO_INT_CHECK)) { return 1; }
+	if (! config_lookup_bool(&cfg, "GLACIER_VERBOSE",      &GLACIER_VERBOSE)) { return 1; }
+	
+	return 0;
+}
+
+/*
+ * load_all_from_profile
+ *
+ * DESCRIPTION: Loads all settings from the Glacier system profile.
+ * PARAMETERS: None.
+ * DEFINED IN: config.h
+ *
+ */
+
+int
+load_all_from_profile(void)
+{
+	if (! config_lookup_string(&cfg, "GLACIER_REPO", 	     &GLACIER_REPO)) { return 1; }
+	if (! config_lookup_string(&cfg, "GLACIER_ARCH",             &GLACIER_ARCH)) { return 1; }
+	if (! config_lookup_string(&cfg, "GLACIER_TARGET", 	     &GLACIER_TARGET)) { return 1; }
+	if (! config_lookup_string(&cfg, "GLACIER_SYSTEM_PROFILE",   &GLACIER_SYSTEM_PROFILE)) { return 1; }
+
+	return 0;
+}
+
+/*
+ * load_setting_from_config
+ *
+ * DESCRIPTION: Load a specified setting from the Glacier config file.
+ * PARAMETERS: char SETTING[]
+ * DEFINED IN: config.h
+ *
+ */
+
+/* int
+load_setting_from_config(char SETTING[])
+{} */
+
+/*
+* create_node
+*
+* DESCRIPTION: Create a dependency tree node.
+* PARAMETERS: char *data
+* DEFINED IN: data.h
+*
+*/
+
+struct node
+*create_node(char *data)
+{
+	if (data == NULL) {
+		if (LG_VERBOSE == 1) { errlog("NULL data passed to create_node()"); }
+		return NULL;
+	}
+
+	struct node *newNode = (struct node*)malloc(sizeof(struct node));
+	if (newNode == NULL) {
+		if (LG_VERBOSE == 1) { errlog("Memory allocation failed in create_node()"); }
+		return NULL;
+	}
+
+	newNode->data = strdup(data);
+	if (newNode->data == NULL) {
+		if (LG_VERBOSE == 1) { errlog("String duplication failed in create_node()"); }
+		free(newNode);
+		return NULL;
+	}
+
+	newNode->numChildren = 0;
+	newNode->left = NULL;
+	newNode->right = NULL;
+	
+	for (int i = 0; i < MAX_CHILDREN; i++) {
+		newNode->children[i] = NULL;
+	}
+	
+	return newNode;
+}
+
+/*
+ * free_node
+ *
+ * DESCRIPTION: Recursively free a node and all its children.
+ * PARAMETERS: struct node *root
+ * DEFINED IN: data.h
+ *
+ */
+
+void
+free_node(struct node *root)
+{
+	if (root == NULL) {
+		return;
+	}
+	
+	/* Free all children recursively */
+	for (int i = 0; i < root->numChildren; i++) {
+		free_node(root->children[i]);
+	}
+	
+	/* Free data string */
+	if (root->data != NULL) {
+		free(root->data);
+	}
+	
+	/* Free node itself */
+	free(root);
+}
+
+/*
+ * add_child
+ *
+ * DESCRIPTION: Add a child node to a parent node.
+ * PARAMETERS: struct node *parent, struct node *child
+ * DEFINED IN: data.h
+ *
+ */
+
+int
+add_child(struct node *parent, struct node *child)
+{
+	if (parent == NULL || child == NULL) {
+		if (LG_VERBOSE == 1) { 
+			errlog("NULL pointer passed to add_child()"); 
+		}
+		return 1;
+	}
+
+	if (parent->numChildren < 0 || parent->numChildren >= MAX_CHILDREN) {
+		if (LG_VERBOSE == 1) { 
+			errlog("Invalid numChildren value in parent node");
+		}
+		return 2;
+	}
+
+	if (parent->numChildren < MAX_CHILDREN) {
+		parent->children[parent->numChildren++] = child;
+		return 0;
+	} else {
+		if (LG_VERBOSE == 1) { 
+			errlog("Maximum number of children exceeded");
+		}
+		return 3;
+	}
+}
+
+/*
+* print_tree
+*
+* DESCRIPTION: Print a dependency tree.
+* PARAMETERS: struct node *root, int level
+* DEFINED IN: data.h
+*
+*/
+
+int
+print_tree(struct node *root, int level)
+{
+	if (root == NULL) {
+		return 0;
+	}
+	
+	if (level < 0) {
+		if (LG_VERBOSE == 1) {
+			errlog("Invalid level value in print_tree()");
+		}
+		return 1;
+	}
+	
+	if (level > MAX_RECURSION_DEPTH) {
+		/* Safety check to prevent stack overflow from recursive calls */
+		if (LG_VERBOSE == 1) {
+			errlog("Maximum recursion depth exceeded in print_tree()");
+		}
+		return 2;
+	}
+
+	for (int i = 0; i < level; i++) {
+		printf("	");
+	}
+
+	if (root->data == NULL) {
+		printf("(NULL)\n");
+	} else {
+		printf("%s\n", root->data);
+	}
+
+	if (root->numChildren < 0 || root->numChildren > MAX_CHILDREN) {
+		if (LG_VERBOSE == 1) {
+			errlog("Invalid numChildren value in node");
+		}
+		return 3;
+	}
+
+	for (int i = 0; i < root->numChildren; i++) {
+		if (print_tree(root->children[i], level + 1) != 0) {
+			/* Propagate errors up the call stack */
+			return 4;
+		}
+	}
+	
+	return 0;
+}
+
+/*
+ * mkworkspace
+ *
+ * DESCRIPTION: Creates a new Glacier workspace in /tmp.
+ * PARAMETERS: None.
+ * DEFINED IN: pkgops.h
+ *
+ */
+
+int
+mkworkspace(void)
+{
+	const char *workspace_path = "/tmp/glacier-workspace";
+	
+	DIR* workspace = opendir(workspace_path);
+	if (workspace) {
+		/* Workspace exists */
+		closedir(workspace);
+		/* infolog("Not creating new workspace, valid workspace already exists."); */
+		return 0;
+	} else if (ENOENT == errno) {
+		/* infolog("Creating new Glacier workspace..."); */
+		if (mkdir(workspace_path, DEFAULT_PERMISSIONS) != 0) {
+			if (LG_VERBOSE == 1) {
+				errlog("in mkworkspace()");
+				errlog("mkdir() failed to create workspace directory");
+				fprintf(stderr, "Error: %s\n", strerror(errno));
+			}
+			return -1;
+		}
+		return 1;
+	} else {
+		/* Some other error occurred */
+		if (LG_VERBOSE == 1) {
+			errlog("in mkworkspace()");
+			errlog("opendir() failed to check workspace");
+			fprintf(stderr, "Error: %s\n", strerror(errno));
+		}
+		return -1;
+	}
+}
+
+/*
+ * prepare_pkg
+ *
+ * DESCRIPTION: Copies a package archive from the localdb to the workspace, and unpacks it.
+ * PARAMETERS: char PACKAGE[]
+ * DEFINED IN: pkgops.h
+ *
+ */
+
+int
+prepare_pkg(char PACKAGE[])
+{
+	if (PACKAGE == NULL) {
+		printf(COL_RED "[x] " COL_RESET "Package '%s' does not exist in the local database.\n", PACKAGE);
+		errlog("Ensure your local database is up to date and try again.");
+		errlog("This can be done by running 'glacier-update-pkgdb' as root.");
+		return 1;
+	} else {
+		char PKG_NEW[PATH_MAX_SIZE];
+		PKG_NEW[0] = '\0'; /* Initialize the string buffer */
+		snprintf(PKG_NEW, sizeof(PKG_NEW), "/tmp/glacier-workspace/%s.tar", PACKAGE);
+		
+		FILE *pkg_old, *pkg_new;
+		char buffer[BUFFER_SIZE];
+		size_t bytes_read;
+
+		pkg_old = fopen(PACKAGE, "r");
+		if (pkg_old == NULL) {
+			errlog("Failed to open source package file");
+			return 1;
+		}
+		
+		pkg_new = fopen(PKG_NEW, "w");
+		if (pkg_new == NULL) {
+			errlog("Failed to create destination package file");
+			fclose(pkg_old);
+			return 1;
+		}
+
+		/* Use buffered I/O for better efficiency */
+		while ((bytes_read = fread(buffer, 1, sizeof(buffer), pkg_old)) > 0) {
+			if (fwrite(buffer, 1, bytes_read, pkg_new) != bytes_read) {
+				errlog("Failed to write to destination file");
+				fclose(pkg_old);
+				fclose(pkg_new);
+				return 1;
+			}
+		}
+
+		fclose(pkg_old);
+		fclose(pkg_new);
+		
+		/* Fork before exec to prevent process replacement */
+		pid_t pid = fork();
+		if (pid < 0) {
+			errlog("Failed to fork process");
+			return 1;
+		} else if (pid == 0) {
+			/* Child process */
+			char *tar_args[] = {
+				"/bin/tar", /* This should be changed to /glacier/bin/tar later on */
+				"-xvf",
+				PKG_NEW,
+				NULL,
+			};
+
+			execvp("/bin/tar", tar_args);
+			/* If we get here, execvp failed */
+			fprintf(stderr, COL_RED "[x] " COL_RESET "Failed to execute tar: %s\n", strerror(errno));
+			exit(EXIT_FAILURE);
+		} else {
+			/* Parent process */
+			int status;
+			waitpid(pid, &status, 0);
+			
+			if (WIFEXITED(status) && WEXITSTATUS(status) != 0) {
+				printf(COL_RED "[x] " COL_RESET "Error while unpacking archive for package %s.\n", PACKAGE);
+				return WEXITSTATUS(status);
+			}
+			
+			if (remove(PKG_NEW) != 0) {
+				warnlog("Failed to remove temporary package file");
+			}
+			
+			char pkg_dir[PATH_MAX_SIZE];
+			pkg_dir[0] = '\0'; /* Initialize the string buffer */
+			snprintf(pkg_dir, sizeof(pkg_dir), "/tmp/glacier-workspace/%s", PACKAGE);
+			
+			if (chdir(pkg_dir) != 0) {
+				errlog("Failed to change directory");
+				return 1;
+			}
+			
+			return 0;
+		}
+	}
+	
+	/* Should never reach here, but added for completeness */
+	return 1;
+}
+
+/*
+ * run_make_task
+ *
+ * DESCRIPTION: Runs a make task in current working directory 
+ * PARAMETERS: char TASK[]
+ * DEFINED IN: pkgops.h
+ *
+ */
+
+int
+run_make_task(char TASK[])
+{
+	if (TASK == NULL) {
+		errlog("No task specified for make");
+		return 1;
+	}
+
+	/* Fork before exec to prevent process replacement */
+	pid_t pid = fork();
+	if (pid < 0) {
+		errlog("Failed to fork process");
+		return 1;
+	} else if (pid == 0) {
+		/* Child process */
+		char *build_args[] = {
+			"/bin/make", /* This should be changed to /glacier/bin/make later on */
+			TASK,
+			NULL
+		};
+
+		execvp("/bin/make", build_args);
+		/* If we get here, execvp failed */
+		errlog("Failed to execute make");
+		fprintf(stderr, "Error: %s\n", strerror(errno));
+		exit(EXIT_FAILURE);
+	} else {
+		/* Parent process */
+		int status;
+		waitpid(pid, &status, 0);
+		
+		if (WIFEXITED(status)) {
+			return WEXITSTATUS(status);
+		} else {
+			errlog("Make process terminated abnormally");
+			return 1;
+		}
+	}
+
+	/* Should never reach here, but added for completeness */
+	return 1;
+}
+
+/*
+ * print_hash
+ *
+ * DESCRIPTION: Prints a specified hash string
+ * PARAMETERS: unsigned char *hash, unsigned int length
+ * DEFINED IN: security.h
+ *
+ */
+
+int
+print_hash(uchar *hash, uint length)
+{
+	if (hash == NULL) {
+		errlog("NULL hash pointer passed to print_hash()");
+		return 1;
+	}
+
+	if (length == 0) {
+		warnlog("Zero-length hash passed to print_hash()");
+	}
+
+	for (uint index = 0; index < length; index++) {
+		printf("%02x", hash[index]);
+	}
+
+	printf("\n");
+
+	return 0;
+}
+
+/*
+ * stash_hash
+ *
+ * DESCRIPTION: Stores a hash inside a string
+ * PARAMETERS: unsigned char *stored_hash, unsigned char *hash, unsigned int length
+ * DEFINED IN: security.h
+ *
+ */
+
+int
+stash_hash(char *stored_hash, unsigned int stored_hash_size, const uchar *hash, uint length)
+{
+	if (stored_hash == NULL || hash == NULL) {
+		if (LG_VERBOSE == 1) {
+			errlog("in stash_hash()");
+			errlog("NULL pointer provided");
+		}
+		return 1;
+	}
+	
+	if (stored_hash_size < (length * 2 + 1)) {
+		if (LG_VERBOSE == 1) {
+			errlog("in stash_hash()");
+			errlog("Output buffer too small for hash");
+		}
+		return 1;
+	}
+
+	/* Clear the buffer first */
+	stored_hash[0] = '\0';
+	
+	/* Format each byte as a 2-character hex value */
+	for (uint index = 0; index < length; index++) {
+		char hex[3];
+		snprintf(hex, sizeof(hex), "%02x", hash[index]);
+		strncat(stored_hash, hex, stored_hash_size - strlen(stored_hash) - 1);
+	}
+
+	return 0;
+}
+
+/*
+ * hash_file
+ *
+ * DESCRIPTION: Performs a hashing operation on a file and stores the result
+ * PARAMETERS: const char *filename
+ * DEFINED IN: security.h
+ *
+ */
+
+int
+hash_file(const char *filename, unsigned char *out_hash, unsigned int *out_length)
+{
+	FILE *data = fopen(filename, "rb");
+	if (! data && LG_VERBOSE == 1) {
+		errlog("in hash_file()");
+		errlog("error opening file handle");
+		return 1;
+	}
+	else if (! data) {
+		return 1;
+	}
+
+	EVP_MD_CTX *context = EVP_MD_CTX_new();
+	if (! context && LG_VERBOSE == 1) {
+		errlog("in hash_file()");
+		errlog("error creating envelope context");
+		fclose(data);
+		return 2;
+	}
+	else if (! context) {
+		fclose(data);
+		return 2;
+	}
+
+	if (EVP_DigestInit_ex(context, EVP_sha256(), NULL) != 1) {
+		if (LG_VERBOSE == 1) {
+			errlog("in hash_file()");
+			errlog("error initializing digest");
+		}
+		EVP_MD_CTX_free(context);
+		fclose(data);
+		return 3;
+	}
+
+	// Read and hash file content
+	unsigned char buffer[BUFFER_SIZE];
+	size_t bytes_read;
+	
+	while ((bytes_read = fread(buffer, 1, BUFFER_SIZE, data)) > 0) {
+		if (EVP_DigestUpdate(context, buffer, bytes_read) != 1) {
+			if (LG_VERBOSE == 1) {
+				errlog("in hash_file()");
+				errlog("error updating digest");
+			}
+			EVP_MD_CTX_free(context);
+			fclose(data);
+			return 4;
+		}
+	}
+
+	if (ferror(data)) {
+		if (LG_VERBOSE == 1) {
+			errlog("in hash_file()");
+			errlog("error reading file");
+		}
+		EVP_MD_CTX_free(context);
+		fclose(data);
+		return 5;
+	}
+
+	fclose(data);
+
+	if (EVP_DigestFinal_ex(context, out_hash, out_length) != 1) {
+		if (LG_VERBOSE == 1) {
+			errlog("in hash_file()");
+			errlog("error finalizing digest");
+		}
+		EVP_MD_CTX_free(context);
+		return 6;
+	}
+	
+	EVP_MD_CTX_free(context);
+
+	return 0;
+}

tests/unit-tests.c

@@ -0,0 +1,83 @@
+/*
+ * 	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)
+{
+	if (is_process_root() != 0) {
+		CU_FAIL("is_process_root() with UID != 0 failed");
+	}
+	else if (is_process_root() == 0) {
+		CU_PASS("is_process_root() with UID != 0 passed");
+	}
+}
+
+void
+test_init_config(void)
+{
+	CU_ASSERT_TRUE(init_config());
+}
+
+int
+main(void)
+{
+	if (CUE_SUCCESS != CU_initialize_registry()) {
+		return CU_get_error();
+	}
+
+	CU_basic_set_mode(CU_BRM_VERBOSE);
+
+	CU_pSuite runtime_tests = CU_add_suite("Runtime Functions Suite", NULL, NULL);
+	if (! runtime_tests) {
+		CU_cleanup_registry();
+		return CU_get_error();
+	}
+
+	CU_pSuite config_tests = CU_add_suite("Configuration Functions Suite", NULL, NULL);
+	if (! config_tests) {
+		CU_cleanup_registry();
+		return CU_get_error();
+	}
+
+	if (! CU_add_test(runtime_tests, "test of is_process_root()", test_is_process_root)) {
+		CU_cleanup_registry();
+		return CU_get_error();
+	}
+
+	if (! CU_add_test(config_tests, "test of init_config()", test_init_config)) {
+		CU_cleanup_registry();
+		return CU_get_error();
+	}
+
+
+
+	CU_basic_run_tests();
+	CU_cleanup_registry();
+	return CU_get_error();
+}