initial commit.

1 files changed, 184 insertions, 0 deletions

diff --git a/src/main/pe_get_image_meta.c b/src/main/pe_get_image_meta.c
new file mode 100644
index 0000000..454f233
--- /dev/null
+++ b/src/main/pe_get_image_meta.c
@@ -0,0 +1,184 @@
+#include <stdint.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <errno.h>
+
+#include <perk/perk.h>
+#include "perk_impl.h"
+
+static int pe_free_image_meta_impl (struct pe_image_meta * meta, int status)
+{
+	if (!meta) return 0;
+
+	free(meta->sectbl);
+	free(meta);
+
+	return status;
+}
+
+int pe_free_image_meta (struct pe_image_meta * meta)
+{
+	return pe_free_image_meta_impl(meta,0);
+}
+
+int pe_get_named_section_index (const struct pe_image_meta * m, const char * name)
+{
+	int i; for (i=0; i<m->coff.num_of_sections; i++)
+		if (!(strcmp(name,m->sectbl[i].name)))
+			return i;
+
+	return -1;
+}
+
+int pe_get_block_section_index (const struct pe_image_meta * m, const struct pe_block * block)
+{
+	int i;
+	uint32_t low,high;
+
+	for (i=0; i<m->coff.num_of_sections; i++) {
+		low  = m->sectbl[i].virtual_addr;
+		high = low + m->sectbl[i].virtual_size;
+
+		if ((block->rva >= low) && (block->rva + block->size <= high))
+			return i;
+	}
+
+	return -1;
+}
+
+int pe_get_image_meta (const struct pe_raw_image * image, struct pe_image_meta ** meta)
+{
+	int i,j,s,status;
+	struct pe_image_meta * m;
+	char * base = image->addr;
+
+	if (!(m = calloc(1,sizeof(*m))))
+		return errno;
+
+	m->ados = (struct pe_image_dos_hdr *)base;
+
+	if ((status = (pe_read_dos_header(m->ados,&m->dos))))
+		return pe_free_image_meta_impl(m,status);
+
+	m->acoff = (struct pe_coff_file_hdr *)(base + m->dos.dos_lfanew);
+
+	if ((status = (pe_read_coff_header(m->acoff,&m->coff))))
+		return pe_free_image_meta_impl(m,status);
+
+	m->aopt = (union pe_opt_hdr *)((char *)m->acoff + sizeof(m->coff));
+
+	if ((status = (pe_read_optional_header(m->aopt,&m->opt))))
+		return pe_free_image_meta_impl(m,status);
+
+	m->asectbl = (struct pe_sec_hdr *)((char *)m->aopt  + m->coff.size_of_opt_hdr);
+
+	if (!(m->sectbl = calloc(m->coff.num_of_sections,sizeof(*(m->sectbl)))))
+		return pe_free_image_meta_impl(m,status);
+
+	for (i=0; i<m->coff.num_of_sections; i++)
+		pe_read_section_header(&m->asectbl[i],&m->sectbl[i]);
+
+	/* .edata */
+	i = pe_get_named_section_index(m,".edata");
+	s = pe_get_block_section_index(m,&m->opt.dirs.export_tbl);
+
+	if ((i >= 0) && (i != s))
+		return pe_free_image_meta_impl(m,PERK_MALFORMED_IMAGE);
+
+	if (i >= 0 ) {
+		m->hedata = &m->sectbl[i];
+		m->aedata = (struct pe_export_hdr *)(base + m->sectbl[i].ptr_to_raw_data);
+	} else if (s >= 0) {
+		m->hedata = &m->sectbl[s];
+		m->aedata = (struct pe_export_hdr *)(base + m->sectbl[s].ptr_to_raw_data
+				+ m->opt.dirs.export_tbl.rva - m->sectbl[s].virtual_addr);
+	}
+
+	if (m->aedata)
+		pe_read_export_header(m->aedata,&m->edata);
+
+	/* .idata */
+	struct pe_import_hdr * 		pidata;
+	struct pe_import_lookup_item *	pitem;
+
+	i = pe_get_named_section_index(m,".idata");
+	s = pe_get_block_section_index(m,&m->opt.dirs.import_tbl);
+
+	if ((i >= 0) && (i != s))
+		return pe_free_image_meta_impl(m,PERK_MALFORMED_IMAGE);
+
+	if (i >= 0 ) {
+		m->hidata = &m->sectbl[i];
+		m->aidata = (struct pe_import_hdr *)(base + m->sectbl[i].ptr_to_raw_data);
+	} else if (s >= 0) {
+		m->hidata = &m->sectbl[s];
+		m->aidata = (struct pe_import_hdr *)(base + m->sectbl[s].ptr_to_raw_data
+				+ m->opt.dirs.import_tbl.rva - m->sectbl[s].virtual_addr);
+	}
+
+	if (m->aidata) {
+		/* num of implibs */
+		for (pidata=m->aidata; pidata->name_rva[0]; pidata++,m->summary.num_of_implibs++);
+
+		/* import headers */
+		if (!(m->idata = calloc(m->summary.num_of_implibs,sizeof(*(m->idata)))))
+			return pe_free_image_meta_impl(m,status);
+
+		for (i=0; i<m->summary.num_of_implibs; i++) {
+			pe_read_import_header(&m->aidata[i],&m->idata[i]);
+
+			m->idata[i].name = base + m->hidata->ptr_to_raw_data
+						+ m->idata[i].name_rva - m->hidata->virtual_addr;
+
+			m->idata[i].aitems = (struct pe_import_lookup_item *)(base + m->hidata->ptr_to_raw_data
+						+ m->idata[i].import_lookup_tbl_rva - m->hidata->virtual_addr);
+
+			printf("%s\n",m->idata[i].name);
+
+			/* items */
+			m->idata[i].count = 0;
+			for (pitem=m->idata[i].aitems; *(uint32_t *)pitem->u.hint_name_tbl_rva; pitem++)
+				m->idata[i].count++;
+
+			if (!(m->idata[i].items = calloc(m->idata[i].count,sizeof(*(m->idata[i].items)))))
+				return pe_free_image_meta_impl(m,status);
+
+			for (j=0; j<m->idata[i].count; j++) {
+				if ((status = pe_read_import_lookup_item(
+						&(m->idata[i].aitems[j]),
+						&(m->idata[i].items[j]),
+						m->opt.std.magic)))
+					return pe_free_image_meta_impl(m,status);
+
+				switch (m->opt.std.magic) {
+					case PE_MAGIC_PE32:
+						m->idata[i].items[j].flags = m->idata[i].items[j].u.import_lookup_entry_32;
+						break;
+
+					case PE_MAGIC_PE32_PLUS:
+						m->idata[i].items[j].flags = (m->idata[i].items[j].u.import_lookup_entry_64 >> 32);
+						break;
+				}
+
+				struct pe_hint_name_entry * pentry = (struct pe_hint_name_entry *)(base + m->hidata->ptr_to_raw_data
+						+ m->idata[i].items[j].u.hint_name_tbl_rva - m->hidata->virtual_addr);
+
+				if (m->idata[i].items[j].flags)
+					m->idata[i].items[j].hint = pe_read_short(pentry->hint);
+				else {
+					m->idata[i].items[j].name = (char *)pentry->name;
+					printf("%s\n",m->idata[i].items[j].name);
+				}
+			}
+		}
+	}
+
+	/* image */
+	m->image.addr = image->addr;
+	m->image.size = image->size;
+
+	/* all done */
+	*meta = m;
+	return 0;
+}