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/***************************************************************/
/* perk: PE Resource Kit */
/* Copyright (C) 2015--2021 SysDeer Technologies, LLC */
/* Released under GPLv2 and GPLv3; see COPYING.PERK. */
/***************************************************************/
#include <stdint.h>
#include <stddef.h>
#include <stdlib.h>
#include <string.h>
#include <sys/mman.h>
#include <perk/perk.h>
#include <perk/perk_arbits.h>
#include "perk_ar_impl.h"
#include "perk_driver_impl.h"
#include "perk_errinfo_impl.h"
static int pe_lib_free_unit_ctx_impl(struct pe_unit_ctx_impl * ctx, int ret)
{
struct pe_image_meta ** pmeta;
if (ctx) {
for (pmeta=ctx->objmeta; pmeta && *pmeta; pmeta++)
pe_meta_free_image_meta(*pmeta);
pe_ar_free_archive_meta(ctx->armeta);
pe_meta_free_image_meta(ctx->meta);
pe_raw_unmap_raw_image(&ctx->map);
free(ctx->objmeta);
free(ctx);
}
return ret;
}
static int pe_lib_create_object_vector_or_verify_archive(
const struct pe_driver_ctx * dctx,
struct pe_unit_ctx_impl * ctx)
{
struct pe_archive_meta * actx;
struct pe_archive_meta_impl * ictx;
struct pe_driver_ctx_impl * idctx;
bool fvector;
bool fstrict;
bool fpurearch;
struct pe_image_meta * meta;
struct pe_image_meta ** objmeta;
size_t veclen;
struct pe_raw_image map;
struct ar_meta_member_info ** pmember;
struct pe_error_info ** errinfp;
enum pe_abi m_abi;
enum pe_subtype m_subtype;
fvector = (dctx->cctx->drvflags & PERK_DRIVER_AR_OBJECT_VECTOR);
fstrict = (dctx->cctx->drvflags & PERK_DRIVER_AR_STRICT_PE);
fpurearch = (dctx->cctx->drvflags & PERK_DRIVER_AR_STRICT_PE_ARCH);
if (!fvector && !fstrict && !fpurearch)
return 0;
actx = ctx->armeta;
ictx = pe_archive_meta_ictx(actx);
idctx = pe_get_driver_ictx(dctx);
veclen = ictx->nentries + 1;
if (fvector && !(ctx->objmeta = calloc(veclen,sizeof(meta))))
return PERK_BUFFER_ERROR(dctx);
if (!actx->a_memberv)
return 0;
for (pmember=actx->a_memberv,objmeta=ctx->objmeta; *pmember; pmember++) {
errinfp = idctx->errinfp;
switch (pmember[0]->ar_member_attr) {
case AR_MEMBER_ATTR_ARCHIVE:
return PERK_CUSTOM_ERROR(dctx,
PERK_ERR_AR_NESTED_ARCHIVE);
case AR_MEMBER_ATTR_ARMAP:
case AR_MEMBER_ATTR_NAMESTRS:
case AR_MEMBER_ATTR_LINKINFO:
break;
default:
map.map_addr = pmember[0]->ar_object_data;
map.map_size = pmember[0]->ar_object_size;
if (!pe_meta_get_image_meta(dctx,&map,&meta)) {
if (fpurearch && (objmeta == ctx->objmeta)) {
m_abi = meta->m_abi;
m_subtype = meta->m_subtype;
} else if (fpurearch) {
if ((meta->m_abi != m_abi) || (meta->m_subtype != m_subtype))
return PERK_CUSTOM_ERROR(dctx,
PERK_ERR_AR_MIXED_PE_MEMBERS);
}
if (fvector) {
*objmeta++ = meta;
} else {
pe_meta_free_image_meta(meta);
};
} else if (fstrict || fpurearch) {
return PERK_CUSTOM_ERROR(dctx,
PERK_ERR_AR_NON_PE_MEMBERS);
} else {
idctx->errinfp = errinfp;
for (; *errinfp; )
*errinfp++ = 0;
}
break;
}
}
return 0;
}
int pe_lib_get_unit_ctx(
const struct pe_driver_ctx * dctx,
const char * path,
struct pe_unit_ctx ** pctx)
{
struct pe_unit_ctx_impl * ctx;
int prot;
char * mark;
size_t siglen;
if (!dctx)
return PERK_CUSTOM_ERROR(
dctx,PERK_ERR_NULL_CONTEXT);
else if (!(ctx = calloc(1,sizeof(*ctx))))
return PERK_BUFFER_ERROR(dctx);
pe_driver_set_ectx(
dctx,0,path);
prot = (dctx->cctx->drvflags & PERK_DRIVER_MAP_WRITE_ACCESS)
? PROT_READ | PROT_WRITE
: PROT_READ;
if (pe_raw_map_raw_image(dctx,-1,path,prot,&ctx->map))
return pe_lib_free_unit_ctx_impl(ctx,
PERK_NESTED_ERROR(dctx));
if (ctx->map.map_size < (siglen = sizeof(struct ar_raw_signature)))
return pe_lib_free_unit_ctx_impl(ctx,
PERK_CUSTOM_ERROR(
dctx,
PERK_ERR_INVALID_IMAGE));
if (!strncmp((mark = ctx->map.map_addr),AR_SIGNATURE,siglen)) {
ctx->armap.map_addr = ctx->map.map_addr;
ctx->armap.map_size = ctx->map.map_size;
if (pe_ar_get_archive_meta(dctx,&ctx->armap,&ctx->armeta))
return pe_lib_free_unit_ctx_impl(ctx,
PERK_NESTED_ERROR(dctx));
if (pe_lib_create_object_vector_or_verify_archive(dctx,ctx) < 0)
return pe_lib_free_unit_ctx_impl(ctx,
PERK_NESTED_ERROR(dctx));
} else if (pe_meta_get_image_meta(dctx,&ctx->map,&ctx->meta)) {
return pe_lib_free_unit_ctx_impl(ctx,
PERK_NESTED_ERROR(dctx));
}
ctx->path = path;
ctx->uctx.path = &ctx->path;
ctx->uctx.meta = ctx->meta;
ctx->uctx.armeta = ctx->armeta;
*pctx = &ctx->uctx;
return 0;
}
void pe_lib_free_unit_ctx(struct pe_unit_ctx * ctx)
{
struct pe_unit_ctx_impl * ictx;
uintptr_t addr;
if (ctx) {
addr = (uintptr_t)ctx - offsetof(struct pe_unit_ctx_impl,uctx);
ictx = (struct pe_unit_ctx_impl *)addr;
pe_lib_free_unit_ctx_impl(ictx,0);
}
}
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