mirror of https://github.com/neutrinolabs/xrdp
404 lines
12 KiB
C
404 lines
12 KiB
C
/**
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* xrdp: A Remote Desktop Protocol server.
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*
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* Copyright (C) Jay Sorg 2004-2012
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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* Parsing structs and macros
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*
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* based on parse.h from rdesktop
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* this is a super fast stream method, you bet
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* needed functions g_malloc, g_free, g_memset, g_memcpy
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*/
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#if !defined(PARSE_H)
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#define PARSE_H
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#include "arch.h"
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#if defined(L_ENDIAN)
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#elif defined(B_ENDIAN)
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#else
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#error Unknown endianness.
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#endif
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/* parser state */
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struct stream
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{
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char* p;
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char* end;
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char* data;
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int size;
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/* offsets of various headers */
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char* iso_hdr;
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char* mcs_hdr;
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char* sec_hdr;
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char* rdp_hdr;
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char* channel_hdr;
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char* next_packet;
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};
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/******************************************************************************/
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#define s_check(s) ((s)->p <= (s)->end)
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/******************************************************************************/
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#define s_check_rem(s, n) ((s)->p + (n) <= (s)->end)
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/******************************************************************************/
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#define s_check_end(s) ((s)->p == (s)->end)
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/******************************************************************************/
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#define make_stream(s) \
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(s) = (struct stream*)g_malloc(sizeof(struct stream), 1)
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/******************************************************************************/
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#define init_stream(s, v) do \
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{ \
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if ((v) > (s)->size) \
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{ \
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g_free((s)->data); \
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(s)->data = (char*)g_malloc((v), 0); \
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(s)->size = (v); \
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} \
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(s)->p = (s)->data; \
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(s)->end = (s)->data; \
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(s)->next_packet = 0; \
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} while (0)
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/******************************************************************************/
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#define free_stream(s) do \
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{ \
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if ((s) != 0) \
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{ \
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g_free((s)->data); \
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} \
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g_free((s)); \
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} while (0)
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/******************************************************************************/
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#define s_push_layer(s, h, n) do \
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{ \
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(s)->h = (s)->p; \
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(s)->p += (n); \
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} while (0)
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/******************************************************************************/
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#define s_pop_layer(s, h) \
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(s)->p = (s)->h
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/******************************************************************************/
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#define s_mark_end(s) \
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(s)->end = (s)->p
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#define in_sint8(s, v) do \
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{ \
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(v) = *((signed char*)((s)->p)); \
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(s)->p++; \
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} while (0)
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/******************************************************************************/
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#define in_uint8(s, v) do \
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{ \
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(v) = *((unsigned char*)((s)->p)); \
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(s)->p++; \
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} while (0)
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/******************************************************************************/
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#if defined(B_ENDIAN) || defined(NEED_ALIGN)
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#define in_sint16_le(s, v) do \
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{ \
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(v) = (signed short) \
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( \
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(*((unsigned char*)((s)->p + 0)) << 0) | \
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(*((unsigned char*)((s)->p + 1)) << 8) \
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); \
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(s)->p += 2; \
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} while (0)
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#else
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#define in_sint16_le(s, v) do \
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{ \
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(v) = *((signed short*)((s)->p)); \
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(s)->p += 2; \
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} while (0)
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#endif
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/******************************************************************************/
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#if defined(B_ENDIAN) || defined(NEED_ALIGN)
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#define in_uint16_le(s, v) do \
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{ \
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(v) = (unsigned short) \
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( \
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(*((unsigned char*)((s)->p + 0)) << 0) | \
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(*((unsigned char*)((s)->p + 1)) << 8) \
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); \
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(s)->p += 2; \
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} while (0)
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#else
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#define in_uint16_le(s, v) do \
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{ \
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(v) = *((unsigned short*)((s)->p)); \
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(s)->p += 2; \
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} while (0)
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#endif
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/******************************************************************************/
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#define in_uint16_be(s, v) do \
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{ \
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(v) = *((unsigned char*)((s)->p)); \
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(s)->p++; \
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(v) <<= 8; \
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(v) |= *((unsigned char*)((s)->p)); \
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(s)->p++; \
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} while (0)
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/******************************************************************************/
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#if defined(B_ENDIAN) || defined(NEED_ALIGN)
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#define in_uint32_le(s, v) do \
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{ \
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(v) = (unsigned int) \
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( \
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(*((unsigned char*)((s)->p + 0)) << 0) | \
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(*((unsigned char*)((s)->p + 1)) << 8) | \
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(*((unsigned char*)((s)->p + 2)) << 16) | \
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(*((unsigned char*)((s)->p + 3)) << 24) \
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); \
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(s)->p += 4; \
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} while (0)
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#else
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#define in_uint32_le(s, v) do \
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{ \
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(v) = *((unsigned int*)((s)->p)); \
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(s)->p += 4; \
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} while (0)
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#endif
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/******************************************************************************/
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#define in_uint32_be(s, v) do \
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{ \
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(v) = *((unsigned char*)((s)->p)); \
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(s)->p++; \
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(v) <<= 8; \
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(v) |= *((unsigned char*)((s)->p)); \
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(s)->p++; \
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(v) <<= 8; \
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(v) |= *((unsigned char*)((s)->p)); \
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(s)->p++; \
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(v) <<= 8; \
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(v) |= *((unsigned char*)((s)->p)); \
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(s)->p++; \
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} while (0)
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/******************************************************************************/
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#define out_uint8(s, v) do \
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{ \
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*((s)->p) = (unsigned char)(v); \
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(s)->p++; \
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} while (0)
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/******************************************************************************/
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#if defined(B_ENDIAN) || defined(NEED_ALIGN)
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#define out_uint16_le(s, v) do \
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{ \
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*((s)->p) = (unsigned char)((v) >> 0); \
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(s)->p++; \
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*((s)->p) = (unsigned char)((v) >> 8); \
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(s)->p++; \
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} while (0)
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#else
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#define out_uint16_le(s, v) do \
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{ \
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*((unsigned short*)((s)->p)) = (unsigned short)(v); \
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(s)->p += 2; \
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} while (0)
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#endif
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/******************************************************************************/
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#define out_uint16_be(s, v) do \
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{ \
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*((s)->p) = (unsigned char)((v) >> 8); \
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(s)->p++; \
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*((s)->p) = (unsigned char)((v) >> 0); \
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(s)->p++; \
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} while (0)
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/******************************************************************************/
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#if defined(B_ENDIAN) || defined(NEED_ALIGN)
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#define out_uint32_le(s, v) do \
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{ \
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*((s)->p) = (unsigned char)((v) >> 0); \
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(s)->p++; \
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*((s)->p) = (unsigned char)((v) >> 8); \
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(s)->p++; \
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*((s)->p) = (unsigned char)((v) >> 16); \
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(s)->p++; \
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*((s)->p) = (unsigned char)((v) >> 24); \
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(s)->p++; \
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} while (0)
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#else
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#define out_uint32_le(s, v) do \
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{ \
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*((unsigned int*)((s)->p)) = (v); \
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(s)->p += 4; \
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} while (0)
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#endif
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/******************************************************************************/
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#define out_uint32_be(s, v) do \
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{ \
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*((s)->p) = (unsigned char)((v) >> 24); \
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s->p++; \
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*((s)->p) = (unsigned char)((v) >> 16); \
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s->p++; \
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*((s)->p) = (unsigned char)((v) >> 8); \
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s->p++; \
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*((s)->p) = (unsigned char)(v); \
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(s)->p++; \
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} while (0)
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/******************************************************************************/
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#define in_uint8p(s, v, n) do \
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{ \
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(v) = (s)->p; \
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(s)->p += (n); \
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} while (0)
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/******************************************************************************/
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#define in_uint8a(s, v, n) do \
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{ \
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g_memcpy((v), (s)->p, (n)); \
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(s)->p += (n); \
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} while (0)
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/******************************************************************************/
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#define in_uint8s(s, n) \
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(s)->p += (n)
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/******************************************************************************/
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#define out_uint8p(s, v, n) do \
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{ \
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g_memcpy((s)->p, (v), (n)); \
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(s)->p += (n); \
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} while (0)
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/******************************************************************************/
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#define out_uint8a(s, v, n) \
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out_uint8p((s), (v), (n))
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/******************************************************************************/
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#define out_uint8s(s, n) do \
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{ \
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g_memset((s)->p, 0, (n)); \
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(s)->p += (n); \
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} while (0)
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/*
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* @brief allocate a new stream
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*
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* @param _s opaque handle to the new stream
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* @param _l length of new stream
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******************************************************************************/
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#define xstream_new(_s, _l) \
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do \
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{ \
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make_stream((_s)); \
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init_stream((_s), (_l)); \
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} while (0)
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/**
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* @brief release a previously allocated stream
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*
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* @param _s opaque handle returned by stream_new()
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*****************************************************************************/
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#define xstream_free(_s) free_stream(_s)
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#define xstream_rd_u8(_s, _var) in_uint8(_s, _var)
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#define xstream_rd_u16_le(_s, _var) in_uint16_le(_s, _var)
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#define xstream_rd_u32_le(_s, _var) in_uint32_le(_s, _var)
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#define xstream_rd_s8_le(_s, _var) in_sint8(_s, _var)
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#define xstream_rd_s16_le(_s, _var) in_sint16_le(_s, _var)
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#define xstream_rd_s32_le(_s, _var) TODO
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#define xstream_wr_u8(_s, _var) out_uint8(_s, _var)
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#define xstream_wr_u16_le(_s, _var) out_uint16_le(_s, _var)
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#define xstream_wr_u32_le(_s, _var) out_uint32_le(_s, _var)
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#define xstream_wr_s8(_s, _var) TODO
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#define xstream_wr_s16_le(_s, _var) TODO
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#define xstream_wr_s32_le(_s, _var) TODO
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#define xstream_rd_u64_le(_s, _v) \
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do \
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{ \
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_v = \
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(tui64)(*((unsigned char *)_s->p)) | \
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(((tui64) (*(((unsigned char *)_s->p) + 1))) << 8) | \
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(((tui64) (*(((unsigned char *)_s->p) + 2))) << 16) | \
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(((tui64) (*(((unsigned char *)_s->p) + 3))) << 24) | \
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(((tui64) (*(((unsigned char *)_s->p) + 4))) << 32) | \
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(((tui64) (*(((unsigned char *)_s->p) + 5))) << 40) | \
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(((tui64) (*(((unsigned char *)_s->p) + 6))) << 48) | \
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(((tui64) (*(((unsigned char *)_s->p) + 7))) << 56); \
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_s->p += 8; \
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} while (0)
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#define xstream_wr_u64_le(_s, _v) \
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do \
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{ \
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*(((unsigned char *) _s->p) + 0) = (unsigned char) ((_v >> 0) & 0xff); \
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*(((unsigned char *) _s->p) + 1) = (unsigned char) ((_v >> 8) & 0xff); \
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*(((unsigned char *) _s->p) + 2) = (unsigned char) ((_v >> 16) & 0xff); \
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*(((unsigned char *) _s->p) + 3) = (unsigned char) ((_v >> 24) & 0xff); \
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*(((unsigned char *) _s->p) + 4) = (unsigned char) ((_v >> 32) & 0xff); \
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*(((unsigned char *) _s->p) + 5) = (unsigned char) ((_v >> 40) & 0xff); \
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*(((unsigned char *) _s->p) + 6) = (unsigned char) ((_v >> 48) & 0xff); \
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*(((unsigned char *) _s->p) + 7) = (unsigned char) ((_v >> 56) & 0xff); \
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_s->p += 8; \
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} while (0)
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/* copy data into stream */
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#define xstream_copyin(_s, _dest, _len) \
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do \
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{ \
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g_memcpy((_s)->p, (_dest), (_len)); \
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(_s)->p += (_len); \
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} while (0)
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/* copy data out of stream */
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#define xstream_copyout(_dest, _s, _len) \
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{ \
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do \
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g_memcpy((_dest), (_s)->p, (_len)); \
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(_s)->p += (_len); \
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} while (0)
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#define xstream_rd_string(_dest, _s, _len) \
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do \
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{ \
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g_memcpy((_dest), (_s)->p, (_len)); \
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(_s)->p += (_len); \
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} while (0)
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#define xstream_wr_string(_s, _src, _len) \
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do \
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{ \
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g_memcpy((_s)->p, (_src), (_len)); \
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(_s)->p += (_len); \
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} while (0)
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#define xstream_len(_s) (int) ((_s)->p - (_s)->data)
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#define xstream_seek(_s, _len) (_s)->p += (_len)
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#endif
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