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/*****************************************************************************/
/* pemagination: a (virtual) tour into portable bits and executable bytes */
/* Copyright (C) 2013--2017 Z. Gilboa */
/* Released under GPLv2 and GPLv3; see COPYING.PEMAGINE. */
/*****************************************************************************/
#include <psxtypes/psxtypes.h>
#include <pemagine/pemagine.h>
#include "pe_os.h"
struct pe_framework_cmdline {
struct pe_guid_str_utf16 guid;
wchar16_t space1;
wchar16_t rarg[2];
wchar16_t space2;
wchar16_t addr[2*__SIZEOF_POINTER__];
wchar16_t null;
};
static int32_t pe_hex_utf16_to_uint32(
const wchar16_t hex_key_utf16[8],
uint32_t * key)
{
int i;
unsigned char uch[8];
unsigned char ubytes[4];
uint32_t * key_ret;
/* input validation */
for (i=0; i<8; i++)
if (!((hex_key_utf16[i] >= 'a') && (hex_key_utf16[i] <= 'f')))
if (!((hex_key_utf16[i] >= 'A') && (hex_key_utf16[i] <= 'F')))
if (!((hex_key_utf16[i] >= '0') && (hex_key_utf16[i] <= '9')))
return OS_STATUS_ILLEGAL_CHARACTER;
/* intermediate step: little endian byte order */
uch[0] = (unsigned char)hex_key_utf16[6];
uch[1] = (unsigned char)hex_key_utf16[7];
uch[2] = (unsigned char)hex_key_utf16[4];
uch[3] = (unsigned char)hex_key_utf16[5];
uch[4] = (unsigned char)hex_key_utf16[2];
uch[5] = (unsigned char)hex_key_utf16[3];
uch[6] = (unsigned char)hex_key_utf16[0];
uch[7] = (unsigned char)hex_key_utf16[1];
for (i=0; i<8; i++) {
/* 'a' > 'A' > '0' */
if (uch[i] >= 'a')
uch[i] -= ('a' - 0x0a);
else if (uch[i] >= 'A')
uch[i] -= ('A' - 0x0a);
else
uch[i] -= '0';
}
ubytes[0] = uch[0] * 0x10 + uch[1];
ubytes[1] = uch[2] * 0x10 + uch[3];
ubytes[2] = uch[4] * 0x10 + uch[5];
ubytes[3] = uch[6] * 0x10 + uch[7];
key_ret = (uint32_t *)ubytes;
*key = *key_ret;
return OS_STATUS_SUCCESS;
}
static int32_t pe_hex_utf16_to_uint16(
const wchar16_t hex_key_utf16[4],
uint16_t * key)
{
int32_t status;
uint32_t dword_key;
wchar16_t hex_buf[8] = {'0','0','0','0'};
hex_buf[4] = hex_key_utf16[0];
hex_buf[5] = hex_key_utf16[1];
hex_buf[6] = hex_key_utf16[2];
hex_buf[7] = hex_key_utf16[3];
if ((status = pe_hex_utf16_to_uint32(hex_buf,&dword_key)))
return status;
*key = (uint16_t)dword_key;
return OS_STATUS_SUCCESS;
}
static int32_t pe_hex_utf16_to_uint64(
const wchar16_t hex_key_utf16[16],
uint64_t * key)
{
int32_t status;
uint32_t x64_key[2];
uint64_t * key_ret;
if ((status = pe_hex_utf16_to_uint32(
&hex_key_utf16[0],
&x64_key[1])))
return status;
if ((status = pe_hex_utf16_to_uint32(
&hex_key_utf16[8],
&x64_key[0])))
return status;
key_ret = (uint64_t *)x64_key;
*key = *key_ret;
return OS_STATUS_SUCCESS;
}
static int32_t pe_hex_utf16_to_uintptr(
const wchar16_t hex_key_utf16[],
uintptr_t * key)
{
#if (__SIZEOF_POINTER__ == 4)
return pe_hex_utf16_to_uint32(hex_key_utf16,key);
#elif (__SIZEOF_POINTER__ == 8)
return pe_hex_utf16_to_uint64(hex_key_utf16,key);
#endif
}
static int32_t pe_string_to_guid_utf16(
const struct pe_guid_str_utf16 *guid_str,
struct pe_guid * guid)
{
int32_t status;
uint16_t key;
const wchar16_t * wch;
if ((guid_str->lbrace != '{')
|| (guid_str->rbrace != '}')
|| (guid_str->dash1 != '-')
|| (guid_str->dash2 != '-')
|| (guid_str->dash3 != '-')
|| (guid_str->dash4 != '-'))
return OS_STATUS_INVALID_PARAMETER;
wch = &(guid_str->group5[0]);
if ((status = pe_hex_utf16_to_uint32(
guid_str->group1,
&guid->data1)))
return status;
if ((status = pe_hex_utf16_to_uint16(
guid_str->group2,
&guid->data2)))
return status;
if ((status = pe_hex_utf16_to_uint16(
guid_str->group3,
&guid->data3)))
return status;
if ((status = pe_hex_utf16_to_uint16(
guid_str->group4,
&key)))
return status;
guid->data4[0] = key >> 8;
guid->data4[1] = key % 0x100;
if ((status = pe_hex_utf16_to_uint16(
&(wch[0]),
&key)))
return status;
guid->data4[2] = key >> 8;
guid->data4[3] = key % 0x100;
if ((status = pe_hex_utf16_to_uint16(
&(wch[4]),
&key)))
return status;
guid->data4[4] = key >> 8;
guid->data4[5] = key % 0x100;
if ((status = pe_hex_utf16_to_uint16(
&(wch[8]),
&key)))
return status;
guid->data4[6] = key >> 8;
guid->data4[7] = key % 0x100;
return OS_STATUS_SUCCESS;
}
static int32_t pe_guid_compare(
const struct pe_guid * pguid_dst,
const struct pe_guid * pguid_src)
{
const uint32_t * dst;
const uint32_t * src;
dst = &pguid_dst->data1;
src = &pguid_src->data1;
if ((dst[0] == src[0])
&& (dst[1] == src[1])
&& (dst[2] == src[2])
&& (dst[3] == src[3]))
return OS_STATUS_SUCCESS;
return OS_STATUS_NO_MATCH;
}
int32_t pe_get_framework_runtime_data(
struct pe_framework_runtime_data ** rtdata,
const wchar16_t * cmdline,
const struct pe_guid * abi)
{
int32_t status;
struct pe_framework_runtime_data * prtdata;
struct pe_framework_cmdline * fcmdline;
struct pe_guid guid;
uintptr_t address;
uintptr_t buffer;
void * hntdll;
os_zw_read_virtual_memory * zw_read_virtual_memory;
/* init */
if (!(hntdll = pe_get_ntdll_module_handle()))
return OS_STATUS_INTERNAL_ERROR;
if (!(zw_read_virtual_memory = (os_zw_read_virtual_memory *)pe_get_procedure_address(
hntdll,"ZwReadVirtualMemory")))
return OS_STATUS_INTERNAL_ERROR;
/* framework cmdline */
fcmdline = (struct pe_framework_cmdline *)cmdline;
/* framework cmdline: conformance */
if (fcmdline->null)
return OS_STATUS_INVALID_PARAMETER;
/* framework cmdline: rarg */
if ((fcmdline->space1 != ' ')
|| (fcmdline->space2 != ' ')
|| (fcmdline->rarg[0] != '-')
|| (fcmdline->rarg[1] != 'r'))
return OS_STATUS_INVALID_PARAMETER;
/* framework cmdline: address */
if ((status = pe_hex_utf16_to_uintptr(
fcmdline->addr,
&address)))
return status;
/* framework cmdline: guid */
if ((status = pe_string_to_guid_utf16(
&fcmdline->guid,
&guid)))
return status;
/* framework cmdline: abi */
if ((status = pe_guid_compare(&guid,abi)))
return status;
/* address: alignment */
if (address & 0xFFF)
return OS_STATUS_INVALID_ADDRESS;
/* address is aligned at page boundary */
if ((status = zw_read_virtual_memory(
OS_CURRENT_PROCESS_HANDLE,
(void *)address,
(char *)&buffer,
sizeof(buffer),
0)))
return status;
/* rtdata */
prtdata = (struct pe_framework_runtime_data *)address;
/* rtdata: abi */
if (pe_guid_compare(&prtdata->abi,abi))
return OS_STATUS_CONTEXT_MISMATCH;
/* yay */
*rtdata = prtdata;
return OS_STATUS_SUCCESS;
}
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