seamlessrdp/ServerExe/vchannel.c

/* -*- c-basic-offset: 8 -*-
   rdesktop: A Remote Desktop Protocol client.
   Seamless windows - Virtual channel handling

   Copyright (C) Pierre Ossman <ossman@cendio.se> 2006

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 2 of the License, or
   (at your option) any later version.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/

#include <assert.h>
#include <stdio.h>
#include <stdarg.h>
#include <errno.h>

#include <windows.h>
#include <wtsapi32.h>
#include <cchannel.h>

#include "vchannel.h"

#define CHANNELNAME "seamrdp"

static HANDLE g_mutex = NULL;
static HANDLE g_vchannel = NULL;

void
debug(char *format, ...)
{
        va_list argp;
        char buf[256];

        sprintf(buf, "DEBUG1,");

        va_start(argp, format);
        _vsnprintf(buf + sizeof("DEBUG1,") - 1, sizeof(buf) - sizeof("DEBUG1,") + 1, format, argp);
        va_end(argp);

        vchannel_write(buf);
}


int
vchannel_open()
{
        g_vchannel = WTSVirtualChannelOpen(WTS_CURRENT_SERVER_HANDLE,
                                           WTS_CURRENT_SESSION, CHANNELNAME);

        if (g_vchannel == NULL)
                return -1;

        g_mutex = CreateMutex(NULL, FALSE, "Local\\SeamlessChannel");
        if (!g_mutex) {
                WTSVirtualChannelClose(g_vchannel);
                g_vchannel = NULL;
                return -1;
        }

        return 0;
}

void
vchannel_close()
{
        if (g_mutex)
                CloseHandle(g_mutex);

        if (g_vchannel)
                WTSVirtualChannelClose(g_vchannel);

        g_mutex = NULL;
        g_vchannel = NULL;
}

int
vchannel_is_open()
{
        if (g_vchannel == NULL)
                return 0;
        else
                return 1;
}

int
vchannel_read(char *line, size_t length)
{
        static BOOL overflow_mode = FALSE;
        static char buffer[VCHANNEL_MAX_LINE];
        static size_t size = 0;

        char *newline;
        int line_size;

        BOOL result;
        ULONG bytes_read;

        result = WTSVirtualChannelRead(g_vchannel, 0, buffer + size,
                                       sizeof(buffer) - size, &bytes_read);

        if (!result) {
                errno = EIO;
                return -1;
        }

        if (overflow_mode) {
                newline = strchr(buffer, '\n');
                if (newline && (newline - buffer) < bytes_read) {
                        size = bytes_read - (newline - buffer) - 1;
                        memmove(buffer, newline + 1, size);
                        overflow_mode = FALSE;
                }
        }
        else
                size += bytes_read;

        if (overflow_mode) {
                errno = -EAGAIN;
                return -1;
        }

        newline = strchr(buffer, '\n');
        if (!newline || (newline - buffer) >= size) {
                if (size == sizeof(buffer)) {
                        overflow_mode = TRUE;
                        size = 0;
                }
                errno = -EAGAIN;
                return -1;
        }

        if ((newline - buffer) >= length) {
                errno = ENOMEM;
                return -1;
        }

        *newline = '\0';

        strcpy(line, buffer);
        line_size = newline - buffer;

        size -= newline - buffer + 1;
        memmove(buffer, newline + 1, size);

        return 0;
}

int
vchannel_write(char *format, ...)
{
        BOOL result;
        va_list argp;
        char buf[VCHANNEL_MAX_LINE];
        int size;
        ULONG bytes_written;

        assert(vchannel_is_open());

        va_start(argp, format);
        size = _vsnprintf(buf, sizeof(buf), format, argp);
        va_end(argp);

        assert(size < sizeof(buf));

        WaitForSingleObject(g_mutex, INFINITE);
        result = WTSVirtualChannelWrite(g_vchannel, buf, (ULONG) strlen(buf), &bytes_written);
        result = WTSVirtualChannelWrite(g_vchannel, "\n", (ULONG) 1, &bytes_written);
        ReleaseMutex(g_mutex);

        if (!result)
                return -1;

        return bytes_written;
}
1	ossman_	1073	/* -- c-basic-offset: 8 --
2			rdesktop: A Remote Desktop Protocol client.
3			Seamless windows - Virtual channel handling
4
5			Copyright (C) Pierre Ossman <ossman@cendio.se> 2006
6
7			This program is free software; you can redistribute it and/or modify
8			it under the terms of the GNU General Public License as published by
9			the Free Software Foundation; either version 2 of the License, or
10			(at your option) any later version.
11
12			This program is distributed in the hope that it will be useful,
13			but WITHOUT ANY WARRANTY; without even the implied warranty of
14			MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15			GNU General Public License for more details.
16
17			You should have received a copy of the GNU General Public License
18			along with this program; if not, write to the Free Software
19			Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
20			*/
21
22			#include <assert.h>
23			#include <stdio.h>
24			#include <stdarg.h>
25	ossman_	1074	#include <errno.h>
26	ossman_	1073
27			#include <windows.h>
28			#include <wtsapi32.h>
29			#include <cchannel.h>
30
31			#include "vchannel.h"
32
33			#define CHANNELNAME "seamrdp"
34
35			static HANDLE g_mutex = NULL;
36			static HANDLE g_vchannel = NULL;
37
38			void
39			debug(char *format, ...)
40			{
41			va_list argp;
42			char buf[256];
43
44			sprintf(buf, "DEBUG1,");
45
46			va_start(argp, format);
47			_vsnprintf(buf + sizeof("DEBUG1,") - 1, sizeof(buf) - sizeof("DEBUG1,") + 1, format, argp);
48			va_end(argp);
49
50			vchannel_write(buf);
51			}
52
53
54			int
55			vchannel_open()
56			{
57			g_vchannel = WTSVirtualChannelOpen(WTS_CURRENT_SERVER_HANDLE,
58			WTS_CURRENT_SESSION, CHANNELNAME);
59
60			if (g_vchannel == NULL)
61			return -1;
62
63			g_mutex = CreateMutex(NULL, FALSE, "Local\\SeamlessChannel");
64			if (!g_mutex) {
65			WTSVirtualChannelClose(g_vchannel);
66			g_vchannel = NULL;
67			return -1;
68			}
69
70			return 0;
71			}
72
73			void
74			vchannel_close()
75			{
76			if (g_mutex)
77			CloseHandle(g_mutex);
78
79			if (g_vchannel)
80			WTSVirtualChannelClose(g_vchannel);
81
82			g_mutex = NULL;
83			g_vchannel = NULL;
84			}
85
86			int
87			vchannel_is_open()
88			{
89			if (g_vchannel == NULL)
90			return 0;
91			else
92			return 1;
93			}
94
95			int
96	ossman_	1074	vchannel_read(char *line, size_t length)
97	ossman_	1073	{
98	ossman_	1074	static BOOL overflow_mode = FALSE;
99			static char buffer[VCHANNEL_MAX_LINE];
100			static size_t size = 0;
101
102			char *newline;
103			int line_size;
104
105			BOOL result;
106			ULONG bytes_read;
107
108			result = WTSVirtualChannelRead(g_vchannel, 0, buffer + size,
109			sizeof(buffer) - size, &bytes_read);
110
111			if (!result) {
112			errno = EIO;
113			return -1;
114			}
115
116			if (overflow_mode) {
117			newline = strchr(buffer, '\n');
118			if (newline && (newline - buffer) < bytes_read) {
119			size = bytes_read - (newline - buffer) - 1;
120			memmove(buffer, newline + 1, size);
121			overflow_mode = FALSE;
122			}
123			}
124			else
125			size += bytes_read;
126
127			if (overflow_mode) {
128			errno = -EAGAIN;
129			return -1;
130			}
131
132			newline = strchr(buffer, '\n');
133			if (!newline \|\| (newline - buffer) >= size) {
134			if (size == sizeof(buffer)) {
135			overflow_mode = TRUE;
136			size = 0;
137			}
138			errno = -EAGAIN;
139			return -1;
140			}
141
142			if ((newline - buffer) >= length) {
143			errno = ENOMEM;
144			return -1;
145			}
146
147			*newline = '\0';
148
149			strcpy(line, buffer);
150			line_size = newline - buffer;
151
152			size -= newline - buffer + 1;
153			memmove(buffer, newline + 1, size);
154
155			return 0;
156	ossman_	1073	}
157
158			int
159			vchannel_write(char *format, ...)
160			{
161			BOOL result;
162			va_list argp;
163	ossman_	1074	char buf[VCHANNEL_MAX_LINE];
164	ossman_	1073	int size;
165			ULONG bytes_written;
166
167			assert(vchannel_is_open());
168
169			va_start(argp, format);
170			size = _vsnprintf(buf, sizeof(buf), format, argp);
171			va_end(argp);
172
173			assert(size < sizeof(buf));
174
175			WaitForSingleObject(g_mutex, INFINITE);
176			result = WTSVirtualChannelWrite(g_vchannel, buf, (ULONG) strlen(buf), &bytes_written);
177			result = WTSVirtualChannelWrite(g_vchannel, "\n", (ULONG) 1, &bytes_written);
178			ReleaseMutex(g_mutex);
179
180			if (!result)
181			return -1;
182
183			return bytes_written;
184			}