initial commit.

1 files changed, 73 insertions, 0 deletions

diff --git a/src/modules/pe_get_kernel32_module_handle.c b/src/modules/pe_get_kernel32_module_handle.c
new file mode 100644
index 0000000..9cd0c18
--- /dev/null
+++ b/src/modules/pe_get_kernel32_module_handle.c
@@ -0,0 +1,73 @@
+/*****************************************************************************/
+/*  pemagination: a (virtual) tour into portable bits and executable bytes   */
+/*  Copyright (C) 2013,2014,2015  Z. Gilboa                                  */
+/*  Released under GPLv2 and GPLv3; see COPYING.PEMAGINE.                    */
+/*****************************************************************************/
+
+#include <psxtypes/psxtypes.h>
+#include <pemagine/pe_consts.h>
+#include <pemagine/pe_structs.h>
+#include <pemagine/pemagine.h>
+#include "pe_impl.h"
+
+static int pe_get_kernel32_handle_callback(
+	struct pe_ldr_tbl_entry *	ldr_tbl_entry,
+	enum pe_callback_reason		reason,
+	void *				context)
+{
+	#define KERNEL32_UTF16_STRLEN	24
+
+	int32_t		kernel32_base_name_le[4];
+	char *		kernel32_base_name_ansi;
+
+	intptr_t *	addr;
+	char *		ch;
+	size_t 		match;
+
+	/* avoid scan-based false positives */
+	kernel32_base_name_le[0] = 0x6E72656B; /* 'kern' */
+	kernel32_base_name_le[1] = 0x32336C65; /* 'el32' */
+	kernel32_base_name_le[2] = 0x6C6C642E; /* '.dll' */
+	kernel32_base_name_le[3] = 0;
+
+	kernel32_base_name_ansi = (char *)&kernel32_base_name_le;
+
+	match = 0;
+	addr = (intptr_t *)context;
+
+	if (reason == PE_CALLBACK_REASON_ITEM)
+		if (ldr_tbl_entry->base_dll_name.strlen == KERNEL32_UTF16_STRLEN) {
+			ch	= (char *)ldr_tbl_entry->base_dll_name.buffer;
+			match	= 0;
+
+			while ((match < sizeof(kernel32_base_name_ansi))
+				&& ((*ch == kernel32_base_name_ansi[match])
+					|| (*ch == (kernel32_base_name_ansi[match] + 'A' - 'a')))
+				&& (*(ch + 1) == 0)) {
+					ch+=sizeof(uint16_t);
+					match++;
+				}
+		}
+
+	if (match == sizeof(kernel32_base_name_ansi)) {
+		*addr = (intptr_t)ldr_tbl_entry->dll_base;
+		return 0;
+	}
+	else
+		return 1;
+}
+
+
+pe_api
+void * pe_get_kernel32_module_handle(void)
+{
+
+	intptr_t kernel32_base_addr = 0;
+	void * ptr_to_callback = &kernel32_base_addr;
+
+	pe_enum_modules_in_init_order(
+		&pe_get_kernel32_handle_callback,
+		ptr_to_callback);
+
+	return (void *)kernel32_base_addr;
+}