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/* -*- c-basic-offset: 8 -*- |
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rdesktop: A Remote Desktop Protocol client. |
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Seamless windows - Virtual channel handling |
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|
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Copyright (C) Pierre Ossman <ossman@cendio.se> 2006 |
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|
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This program is free software; you can redistribute it and/or modify |
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it under the terms of the GNU General Public License as published by |
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the Free Software Foundation; either version 2 of the License, or |
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(at your option) any later version. |
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|
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This program is distributed in the hope that it will be useful, |
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but WITHOUT ANY WARRANTY; without even the implied warranty of |
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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GNU General Public License for more details. |
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|
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You should have received a copy of the GNU General Public License |
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along with this program; if not, write to the Free Software |
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
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*/ |
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|
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#include <assert.h> |
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#include <stdio.h> |
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#include <stdarg.h> |
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#include <errno.h> |
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|
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#include <windows.h> |
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#include <wtsapi32.h> |
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#include <cchannel.h> |
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|
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#include "vchannel.h" |
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|
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#define CHANNELNAME "seamrdp" |
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|
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#define INVALID_CHARS "," |
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#define REPLACEMENT_CHAR '_' |
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|
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#ifdef __GNUC__ |
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#define SHARED __attribute__((section ("SHAREDDATA"), shared)) |
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#else |
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#define SHARED |
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#endif |
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|
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// Shared DATA |
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#pragma data_seg ( "SHAREDDATA" ) |
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|
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unsigned int g_vchannel_serial SHARED = 0; |
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|
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#pragma data_seg () |
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|
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#pragma comment(linker, "/section:SHAREDDATA,rws") |
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|
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static HANDLE g_mutex = NULL; |
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static HANDLE g_vchannel = NULL; |
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|
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DLL_EXPORT void |
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debug(char *format, ...) |
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{ |
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va_list argp; |
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char buf[256]; |
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|
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va_start(argp, format); |
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_vsnprintf(buf, sizeof(buf), format, argp); |
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va_end(argp); |
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|
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vchannel_strfilter(buf); |
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|
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vchannel_write("DEBUG", buf); |
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} |
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|
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#define CONVERT_BUFFER_SIZE 1024 |
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static char convert_buffer[CONVERT_BUFFER_SIZE]; |
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|
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DLL_EXPORT const char * |
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unicode_to_utf8(const unsigned short *string) |
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{ |
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unsigned char *buf; |
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size_t size; |
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|
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buf = (unsigned char *) convert_buffer; |
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size = sizeof(convert_buffer) - 1; |
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|
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/* We do not handle characters outside BMP (i.e. we can't do UTF-16) */ |
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while (*string != 0x0000) |
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{ |
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if (*string < 0x80) |
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{ |
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if (size < 1) |
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break; |
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*buf++ = (unsigned char) *string; |
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size--; |
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} |
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else if (*string < 0x800) |
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{ |
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if (size < 2) |
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break; |
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*buf++ = 0xC0 | (*string >> 6); |
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*buf++ = 0x80 | (*string & 0x3F); |
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size -= 2; |
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} |
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else if ((*string < 0xD800) || (*string > 0xDFFF)) |
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{ |
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if (size < 3) |
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break; |
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*buf++ = 0xE0 | (*string >> 12); |
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*buf++ = 0x80 | (*string >> 6 & 0x3F); |
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*buf++ = 0x80 | (*string & 0x3F); |
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size -= 2; |
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} |
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|
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string++; |
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} |
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|
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*buf = '\0'; |
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|
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return convert_buffer; |
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} |
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|
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DLL_EXPORT int |
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vchannel_open() |
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{ |
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g_vchannel = WTSVirtualChannelOpen(WTS_CURRENT_SERVER_HANDLE, |
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WTS_CURRENT_SESSION, CHANNELNAME); |
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|
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if (g_vchannel == NULL) |
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return -1; |
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|
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g_mutex = CreateMutex(NULL, FALSE, "Local\\SeamlessChannel"); |
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if (!g_mutex) |
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{ |
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WTSVirtualChannelClose(g_vchannel); |
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g_vchannel = NULL; |
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return -1; |
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} |
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|
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return 0; |
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} |
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|
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DLL_EXPORT void |
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vchannel_close() |
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{ |
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if (g_mutex) |
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CloseHandle(g_mutex); |
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|
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if (g_vchannel) |
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WTSVirtualChannelClose(g_vchannel); |
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|
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g_mutex = NULL; |
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g_vchannel = NULL; |
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} |
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|
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DLL_EXPORT int |
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vchannel_is_open() |
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{ |
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if (g_vchannel == NULL) |
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return 0; |
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else |
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return 1; |
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} |
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|
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DLL_EXPORT int |
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vchannel_read(char *line, size_t length) |
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{ |
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static BOOL overflow_mode = FALSE; |
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static char buffer[VCHANNEL_MAX_LINE]; |
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static size_t size = 0; |
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|
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char *newline; |
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int line_size; |
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|
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BOOL result; |
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ULONG bytes_read; |
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|
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result = WTSVirtualChannelRead(g_vchannel, 0, buffer + size, |
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sizeof(buffer) - size, &bytes_read); |
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|
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if (!result) |
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{ |
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errno = EIO; |
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return -1; |
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} |
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|
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if (overflow_mode) |
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{ |
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newline = strchr(buffer, '\n'); |
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if (newline && (newline - buffer) < bytes_read) |
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{ |
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size = bytes_read - (newline - buffer) - 1; |
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memmove(buffer, newline + 1, size); |
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overflow_mode = FALSE; |
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} |
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} |
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else |
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size += bytes_read; |
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|
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if (overflow_mode) |
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{ |
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errno = -EAGAIN; |
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return -1; |
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} |
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|
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newline = strchr(buffer, '\n'); |
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if (!newline || (newline - buffer) >= size) |
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{ |
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if (size == sizeof(buffer)) |
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{ |
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overflow_mode = TRUE; |
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size = 0; |
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} |
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errno = -EAGAIN; |
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return -1; |
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} |
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|
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if ((newline - buffer) >= length) |
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{ |
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errno = ENOMEM; |
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return -1; |
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} |
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|
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*newline = '\0'; |
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|
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strcpy(line, buffer); |
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line_size = newline - buffer; |
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|
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size -= newline - buffer + 1; |
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memmove(buffer, newline + 1, size); |
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|
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return 0; |
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} |
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|
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DLL_EXPORT int |
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vchannel_write(const char *command, const char *format, ...) |
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{ |
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BOOL result; |
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va_list argp; |
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char buf[VCHANNEL_MAX_LINE]; |
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int size; |
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ULONG bytes_written; |
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|
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assert(vchannel_is_open()); |
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|
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WaitForSingleObject(g_mutex, INFINITE); |
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|
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size = _snprintf(buf, sizeof(buf), "%s,%u,", command, g_vchannel_serial); |
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|
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assert(size < sizeof(buf)); |
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|
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va_start(argp, format); |
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size += _vsnprintf(buf + size, sizeof(buf) - size, format, argp); |
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va_end(argp); |
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|
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assert(size < sizeof(buf)); |
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|
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result = WTSVirtualChannelWrite(g_vchannel, buf, (ULONG) strlen(buf), &bytes_written); |
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result = WTSVirtualChannelWrite(g_vchannel, "\n", (ULONG) 1, &bytes_written); |
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|
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g_vchannel_serial++; |
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|
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ReleaseMutex(g_mutex); |
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|
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if (!result) |
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return -1; |
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|
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return bytes_written; |
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} |
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|
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DLL_EXPORT void |
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vchannel_block() |
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{ |
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WaitForSingleObject(g_mutex, INFINITE); |
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} |
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|
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DLL_EXPORT void |
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vchannel_unblock() |
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{ |
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ReleaseMutex(g_mutex); |
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} |
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|
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DLL_EXPORT const char * |
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vchannel_strfilter(char *string) |
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{ |
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char *c; |
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|
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for (c = string; *c != '\0'; c++) |
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{ |
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if (((unsigned char) *c < 0x20) || (strchr(INVALID_CHARS, *c) != NULL)) |
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*c = REPLACEMENT_CHAR; |
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} |
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|
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return string; |
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} |
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|
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DLL_EXPORT const char * |
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vchannel_strfilter_unicode(const unsigned short *string) |
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{ |
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return vchannel_strfilter((char *) unicode_to_utf8(string)); |
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} |
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