/***************************************************************/

/*  perk: PE Resource Kit                                      */

/*  Copyright (C) 2015--2021  SysDeer Technologies, LLC        */

/*  Released under GPLv2 and GPLv3; see COPYING.PERK.          */

/***************************************************************/

#include <stdint.h>

#include <stdlib.h>

#include <stdio.h>

#include <string.h>

#include <errno.h>

#include <mdso/mdso_specs.h>

#include <mdso/mdso_structs.h>

#include <perk/perk.h>

#include <perk/perk_consts.h>

#include <perk/perk_output.h>

#include "perk_reader_impl.h"

#include "perk_driver_impl.h"

#include "perk_dprintf_impl.h"

#include "perk_errinfo_impl.h"

static int pretty_header(

	int				fdout,

	const struct pe_common_ctx *	cctx)

{

	return (cctx->fmtflags & PERK_PRETTY_YAML)

		? pe_dprintf(fdout,"dsolibs:\n")

		: 0;

}

static int pretty_dsolib_header(

	int				fdout,

	const struct pe_common_ctx *	cctx,

	const char *			name)

{

	if ((cctx->fmtflags & PERK_PRETTY_YAML) && (cctx->fmtflags & PERK_OUTPUT_MDSO_SYMS))

		return pe_dprintf(fdout,"  %s:\n",name);

	else if (cctx->fmtflags & PERK_PRETTY_YAML)

		return pe_dprintf(fdout,"- %s:\n",name);

	else if (cctx->fmtflags & PERK_OUTPUT_MDSO_SYMS)

		return pe_dprintf(fdout,"%s:\n",name);

	else

		return pe_dprintf(fdout,"%s\n",name);

}

static int pretty_dsolib_item(

	int				fdout,

	const struct pe_common_ctx *	cctx,

	const char *			name)

{

	if (cctx->fmtflags & PERK_PRETTY_YAML)

		return pe_dprintf(fdout,"  - %s\n",name);

	else

		return pe_dprintf(fdout,"%s\n",name);

}

static unsigned char * dsolib_meta(const struct pe_image_meta * m, int i)

{

	struct mdso_raw_meta_record_m32 *	mdso32;

	struct mdso_raw_meta_record_m64 *	mdso64;

	if (m->m_opt.oh_std.coh_magic == PE_MAGIC_PE32_PLUS) {

		mdso64 = (struct mdso_raw_meta_record_m64 *)m->r_dsometa + i;

		return mdso64->mrec_base;

	} else {

		mdso32 = (struct mdso_raw_meta_record_m32 *)m->r_dsometa + i;

		return mdso32->mrec_base;

	}

}

static char * dsolib_name(const struct pe_image_meta * m, int i)

{

	uintptr_t				va;

	uint64_t				rva;

	char *					addr;

	uint32_t				roffset;

	struct mdso_raw_meta_record_m32 *	mdso32;

	struct mdso_raw_meta_record_m64 *	mdso64;

	if (m->m_opt.oh_std.coh_magic == PE_MAGIC_PE32_PLUS) {

		mdso64  = (struct mdso_raw_meta_record_m64 *)m->r_dsometa + i;

		va      = pe_read_quad(mdso64->mrec_name);

		rva     = va - m->m_opt.oh_mem.coh_image_base;

		if (rva >> 32)

			return 0;

	} else {

		mdso32  = (struct mdso_raw_meta_record_m32 *)m->r_dsometa + i;

		va      = pe_read_long(mdso32->mrec_name);

		rva     = va - m->m_opt.oh_mem.coh_image_base;

	}

	if (pe_get_roffset_from_rva(m,(uint32_t)rva,&roffset) < 0)

		return 0;

	return (addr = m->r_image.map_addr) + roffset;

}

static unsigned char * dsosym_meta(const struct pe_image_meta * m, int j)

{

	uint64_t			va;

	uint32_t			rva;

	uint32_t			roffset;

	struct mdso_raw_sym_entry_m32 *	sym32;

	struct mdso_raw_sym_entry_m64 *	sym64;

	int				idx;

	if (m->m_opt.oh_std.coh_magic == PE_MAGIC_PE32_PLUS) {

		sym64 = (struct mdso_raw_sym_entry_m64 *)m->r_dsosyms + j;

		va    = pe_read_quad(sym64->msym_meta);

		rva   = pe_read_long(sym64->msym_meta);

	} else {

		sym32 = (struct mdso_raw_sym_entry_m32 *)m->r_dsosyms + j;

		va    = pe_read_long(sym32->msym_meta);

		rva   = va;

	}

	if ((idx = pe_get_named_section_index(m,MDSO_META_SECTION)) >= 0)

		if (idx != pe_get_block_section_index(m,&(struct pe_block){rva,0}))

			return (unsigned char *)(-1);

	if (va > rva)

		return 0;

	if (pe_get_roffset_from_rva(m,rva,&roffset) < 0)

		return 0;

	return (unsigned char *)m->r_image.map_addr + roffset;

}

static char * dsosym_string(const struct pe_image_meta * m, int j)

{

	uint64_t			va;

	uint32_t			rva;

	char *				addr;

	uint32_t			roffset;

	struct mdso_raw_sym_entry_m32 *	sym32;

	struct mdso_raw_sym_entry_m64 *	sym64;

	int				idx;

	if (m->m_opt.oh_std.coh_magic == PE_MAGIC_PE32_PLUS) {

		sym64 = (struct mdso_raw_sym_entry_m64 *)m->r_dsosyms + j;

		va    = pe_read_quad(sym64->msym_string);

		rva   = pe_read_long(sym64->msym_string);

	} else {

		sym32 = (struct mdso_raw_sym_entry_m32 *)m->r_dsosyms + j;

		va    = pe_read_long(sym32->msym_string);

		rva   = va;

	}

	if ((idx = pe_get_named_section_index(m,MDSO_STRS_SECTION)) >= 0)

		if (idx != pe_get_block_section_index(m,&(struct pe_block){rva,0}))

			return (char *)(-2);

	if (va > rva)

		return 0;

	if (pe_get_roffset_from_rva(m,rva,&roffset) < 0)

		return 0;

	return (addr = m->r_image.map_addr) + roffset;

}

int pe_output_mdso_libraries(

	const struct pe_driver_ctx *	dctx,

	const struct pe_image_meta *	m)

{

	int				i,j;

	int				fdout;

	char *				name;

	unsigned char *			symmeta;

	unsigned char *			dsometa;

	char *				symstr;

	const struct pe_common_ctx *	cctx = dctx->cctx;

	fdout = pe_driver_fdout(dctx);

	if (!m->m_stats.t_ndsolibs)

		return 0;

	if (pe_get_image_abi(m,0) == PE_ABI_UNSUPPORTED)

		return PERK_CUSTOM_ERROR(

			dctx,PERK_ERR_UNSUPPORTED_ABI);

	if ((pretty_header(fdout,cctx)) < 0)

		return PERK_FILE_ERROR(dctx);

	for (i=0; i<m->m_stats.t_ndsolibs; i++) {

		dsometa = dsolib_meta(m,i);

		if (!(name = dsolib_name(m,i)))

			return PERK_CUSTOM_ERROR(

				dctx,PERK_ERR_IMAGE_MALFORMED);

		if ((pretty_dsolib_header(fdout,cctx,name)) < 0)

			return PERK_FILE_ERROR(dctx);

		if (cctx->fmtflags & PERK_OUTPUT_MDSO_SYMS) {

			for (j=0; j<m->m_stats.t_ndsosyms; j++) {

				if (!(symmeta = dsosym_meta(m,j)))

					return PERK_CUSTOM_ERROR(

						dctx,PERK_ERR_IMAGE_MALFORMED);

				if (!(symstr = dsosym_string(m,j)))

					return PERK_CUSTOM_ERROR(

						dctx,PERK_ERR_IMAGE_MALFORMED);

				if (symmeta == dsometa)

					if ((pretty_dsolib_item(fdout,cctx,symstr)) < 0)

						return PERK_FILE_ERROR(dctx);

			}

		}

	}

	return 0;

}