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/*
* Copyright (c) 2010, 2015 ARM Limited
* All rights reserved
*
* The license below extends only to copyright in the software and shall
* not be construed as granting a license to any other intellectual
* property including but not limited to intellectual property relating
* to a hardware implementation of the functionality of the software
* licensed hereunder. You may use the software subject to the license
* terms below provided that you ensure that this notice is replicated
* unmodified and in its entirety in all distributions of the software,
* modified or unmodified, in source code or in binary form.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met: redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer;
* redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution;
* neither the name of the copyright holders nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* Authors: Ali Saidi
* William Wang
*/
/** @file
* Implementiation of a VNC server
*/
#include <sys/ioctl.h>
#include <sys/stat.h>
#if defined(__FreeBSD__)
#include <termios.h>
#else
#include <sys/termios.h>
#endif
#include "base/vnc/vncserver.hh"
#include <fcntl.h>
#include <poll.h>
#include <sys/types.h>
#include <unistd.h>
#include <cerrno>
#include <cstddef>
#include <cstdio>
#include "base/atomicio.hh"
#include "base/logging.hh"
#include "base/output.hh"
#include "base/socket.hh"
#include "base/trace.hh"
#include "debug/VNC.hh"
#include "sim/byteswap.hh"
#include "sim/core.hh"
using namespace std;
const PixelConverter VncServer::pixelConverter(
4, // 4 bytes / pixel
16, 8, 0, // R in [23, 16], G in [15, 8], B in [7, 0]
8, 8, 8, // 8 bits / channel
LittleEndianByteOrder);
/** @file
* Implementiation of a VNC server
*/
/**
* Poll event for the listen socket
*/
VncServer::ListenEvent::ListenEvent(VncServer *vs, int fd, int e)
: PollEvent(fd, e), vncserver(vs)
{
}
void
VncServer::ListenEvent::process(int revent)
{
vncserver->accept();
}
/**
* Poll event for the data socket
*/
VncServer::DataEvent::DataEvent(VncServer *vs, int fd, int e)
: PollEvent(fd, e), vncserver(vs)
{
}
void
VncServer::DataEvent::process(int revent)
{
if (revent & POLLIN)
vncserver->data();
else if (revent & POLLNVAL)
vncserver->detach();
}
/**
* VncServer
*/
VncServer::VncServer(const Params *p)
: VncInput(p), listenEvent(NULL), dataEvent(NULL), number(p->number),
dataFd(-1), sendUpdate(false),
supportsRawEnc(false), supportsResizeEnc(false)
{
if (p->port)
listen(p->port);
curState = WaitForProtocolVersion;
// We currently only support one pixel format. Extract the pixel
// representation from our PixelConverter instance and keep it
// around for telling the client and making sure it cooperates
pixelFormat.bpp = 8 * pixelConverter.length;
pixelFormat.depth = pixelConverter.depth;
pixelFormat.bigendian = pixelConverter.byte_order == BigEndianByteOrder;
pixelFormat.truecolor = 1;
pixelFormat.redmax = pixelConverter.ch_r.mask;
pixelFormat.greenmax = pixelConverter.ch_g.mask;
pixelFormat.bluemax = pixelConverter.ch_b.mask;
pixelFormat.redshift = pixelConverter.ch_r.offset;
pixelFormat.greenshift = pixelConverter.ch_g.offset;
pixelFormat.blueshift = pixelConverter.ch_b.offset;
DPRINTF(VNC, "Vnc server created at port %d\n", p->port);
}
VncServer::~VncServer()
{
if (dataFd != -1)
::close(dataFd);
if (listenEvent)
delete listenEvent;
if (dataEvent)
delete dataEvent;
}
//socket creation and vnc client attach
void
VncServer::listen(int port)
{
if (ListenSocket::allDisabled()) {
warn_once("Sockets disabled, not accepting vnc client connections");
return;
}
while (!listener.listen(port, true)) {
DPRINTF(VNC,
"can't bind address vnc server port %d in use PID %d\n",
port, getpid());
port++;
}
ccprintf(cerr, "%s: Listening for connections on port %d\n",
name(), port);
listenEvent = new ListenEvent(this, listener.getfd(), POLLIN);
pollQueue.schedule(listenEvent);
}
// attach a vnc client
void
VncServer::accept()
{
// As a consequence of being called from the PollQueue, we might
// have been called from a different thread. Migrate to "our"
// thread.
EventQueue::ScopedMigration migrate(eventQueue());
if (!listener.islistening())
panic("%s: cannot accept a connection if not listening!", name());
int fd = listener.accept(true);
if (fd < 0) {
warn("%s: failed to accept VNC connection!", name());
return;
}
if (dataFd != -1) {
char message[] = "vnc server already attached!\n";
atomic_write(fd, message, sizeof(message));
::close(fd);
return;
}
dataFd = fd;
// Send our version number to the client
write((uint8_t *)vncVersion(), strlen(vncVersion()));
// read the client response
dataEvent = new DataEvent(this, dataFd, POLLIN);
pollQueue.schedule(dataEvent);
inform("VNC client attached\n");
}
// data called by data event
void
VncServer::data()
{
// We have new data, see if we can handle it
DPRINTF(VNC, "Vnc client message recieved\n");
switch (curState) {
case WaitForProtocolVersion:
checkProtocolVersion();
break;
case WaitForSecurityResponse:
checkSecurity();
break;
case WaitForClientInit:
// Don't care about shared, just need to read it out of the socket
uint8_t shared;
if (!read(&shared))
return;
// Send our idea of the frame buffer
sendServerInit();
break;
case NormalPhase:
uint8_t message_type;
if (!read(&message_type))
return;
switch (message_type) {
case ClientSetPixelFormat:
setPixelFormat();
break;
case ClientSetEncodings:
setEncodings();
break;
case ClientFrameBufferUpdate:
requestFbUpdate();
break;
case ClientKeyEvent:
recvKeyboardInput();
break;
case ClientPointerEvent:
recvPointerInput();
break;
case ClientCutText:
recvCutText();
break;
default:
warn("Unimplemented message type recv from client: %d\n",
message_type);
detach();
break;
}
break;
default:
panic("Unknown vnc server state\n");
}
}
// read from socket
bool
VncServer::read(uint8_t *buf, size_t len)
{
if (dataFd < 0)
panic("vnc not properly attached.\n");
size_t ret;
do {
ret = ::read(dataFd, buf, len);
} while (ret == -1 && errno == EINTR);
if (ret != len) {
DPRINTF(VNC, "Read failed %d.\n", ret);
detach();
return false;
}
return true;
}
bool
VncServer::read1(uint8_t *buf, size_t len)
{
return read(buf + 1, len - 1);
}
template<typename T>
bool
VncServer::read(T* val)
{
return read((uint8_t *)val, sizeof(T));
}
// write to socket
bool
VncServer::write(const uint8_t *buf, size_t len)
{
if (dataFd < 0)
panic("Vnc client not properly attached.\n");
ssize_t ret = atomic_write(dataFd, buf, len);
if (ret != len) {
DPRINTF(VNC, "Write failed.\n");
detach();
return false;
}
return true;
}
template<typename T>
bool
VncServer::write(T* val)
{
return write((uint8_t *)val, sizeof(T));
}
bool
VncServer::write(const char* str)
{
return write((uint8_t *)str, strlen(str));
}
// detach a vnc client
void
VncServer::detach()
{
if (dataFd != -1) {
::close(dataFd);
dataFd = -1;
}
if (!dataEvent || !dataEvent->queued())
return;
pollQueue.remove(dataEvent);
delete dataEvent;
dataEvent = NULL;
curState = WaitForProtocolVersion;
inform("VNC client detached\n");
DPRINTF(VNC, "detach vnc client %d\n", number);
}
void
VncServer::sendError(const char* error_msg)
{
uint32_t len = strlen(error_msg);
if (!write(&len))
return;
write(error_msg);
}
void
VncServer::checkProtocolVersion()
{
assert(curState == WaitForProtocolVersion);
size_t len M5_VAR_USED;
char version_string[13];
// Null terminate the message so it's easier to work with
version_string[12] = 0;
if (!read((uint8_t *)version_string, sizeof(version_string) - 1)) {
warn("Failed to read protocol version.");
return;
}
uint32_t major, minor;
// Figure out the major/minor numbers
if (sscanf(version_string, "RFB %03d.%03d\n", &major, &minor) != 2) {
warn(" Malformed protocol version %s\n", version_string);
sendError("Malformed protocol version\n");
detach();
return;
}
DPRINTF(VNC, "Client request protocol version %d.%d\n", major, minor);
// If it's not 3.X we don't support it
if (major != 3 || minor < 2) {
warn("Unsupported VNC client version... disconnecting\n");
uint8_t err = AuthInvalid;
write(&err);
detach();
return;
}
// Auth is different based on version number
if (minor < 7) {
uint32_t sec_type = htobe((uint32_t)AuthNone);
if (!write(&sec_type))
return;
} else {
uint8_t sec_cnt = 1;
uint8_t sec_type = htobe((uint8_t)AuthNone);
if (!write(&sec_cnt) || !write(&sec_type))
return;
}
// Wait for client to respond
curState = WaitForSecurityResponse;
}
void
VncServer::checkSecurity()
{
assert(curState == WaitForSecurityResponse);
uint8_t security_type;
if (!read(&security_type))
return;
if (security_type != AuthNone) {
warn("Unknown VNC security type\n");
sendError("Unknown security type\n");
}
DPRINTF(VNC, "Sending security auth OK\n");
uint32_t success = htobe(VncOK);
if (!write(&success))
return;
curState = WaitForClientInit;
}
void
VncServer::sendServerInit()
{
ServerInitMsg msg;
DPRINTF(VNC, "Sending server init message to client\n");
msg.fbWidth = htobe(videoWidth());
msg.fbHeight = htobe(videoHeight());
msg.px.bpp = htobe(pixelFormat.bpp);
msg.px.depth = htobe(pixelFormat.depth);
msg.px.bigendian = htobe(pixelFormat.bigendian);
msg.px.truecolor = htobe(pixelFormat.truecolor);
msg.px.redmax = htobe(pixelFormat.redmax);
msg.px.greenmax = htobe(pixelFormat.greenmax);
msg.px.bluemax = htobe(pixelFormat.bluemax);
msg.px.redshift = htobe(pixelFormat.redshift);
msg.px.greenshift = htobe(pixelFormat.greenshift);
msg.px.blueshift = htobe(pixelFormat.blueshift);
memset(msg.px.padding, 0, 3);
msg.namelen = 2;
msg.namelen = htobe(msg.namelen);
memcpy(msg.name, "M5", 2);
if (!write(&msg))
return;
curState = NormalPhase;
}
void
VncServer::setPixelFormat()
{
DPRINTF(VNC, "Received pixel format from client message\n");
PixelFormatMessage pfm;
if (!read1((uint8_t *)&pfm, sizeof(PixelFormatMessage)))
return;
DPRINTF(VNC, " -- bpp = %d; depth = %d; be = %d\n", pfm.px.bpp,
pfm.px.depth, pfm.px.bigendian);
DPRINTF(VNC, " -- true color = %d red,green,blue max = %d,%d,%d\n",
pfm.px.truecolor, betoh(pfm.px.redmax), betoh(pfm.px.greenmax),
betoh(pfm.px.bluemax));
DPRINTF(VNC, " -- red,green,blue shift = %d,%d,%d\n", pfm.px.redshift,
pfm.px.greenshift, pfm.px.blueshift);
if (betoh(pfm.px.bpp) != pixelFormat.bpp ||
betoh(pfm.px.depth) != pixelFormat.depth ||
betoh(pfm.px.bigendian) != pixelFormat.bigendian ||
betoh(pfm.px.truecolor) != pixelFormat.truecolor ||
betoh(pfm.px.redmax) != pixelFormat.redmax ||
betoh(pfm.px.greenmax) != pixelFormat.greenmax ||
betoh(pfm.px.bluemax) != pixelFormat.bluemax ||
betoh(pfm.px.redshift) != pixelFormat.redshift ||
betoh(pfm.px.greenshift) != pixelFormat.greenshift ||
betoh(pfm.px.blueshift) != pixelFormat.blueshift) {
warn("VNC client doesn't support true color raw encoding\n");
detach();
}
}
void
VncServer::setEncodings()
{
DPRINTF(VNC, "Received supported encodings from client\n");
PixelEncodingsMessage pem;
if (!read1((uint8_t *)&pem, sizeof(PixelEncodingsMessage)))
return;
pem.num_encodings = betoh(pem.num_encodings);
DPRINTF(VNC, " -- %d encoding present\n", pem.num_encodings);
supportsRawEnc = supportsResizeEnc = false;
for (int x = 0; x < pem.num_encodings; x++) {
int32_t encoding;
if (!read(&encoding))
return;
DPRINTF(VNC, " -- supports %d\n", betoh(encoding));
switch (betoh(encoding)) {
case EncodingRaw:
supportsRawEnc = true;
break;
case EncodingDesktopSize:
supportsResizeEnc = true;
break;
}
}
if (!supportsRawEnc) {
warn("VNC clients must always support raw encoding\n");
detach();
}
}
void
VncServer::requestFbUpdate()
{
DPRINTF(VNC, "Received frame buffer update request from client\n");
FrameBufferUpdateReq fbr;
if (!read1((uint8_t *)&fbr, sizeof(FrameBufferUpdateReq)))
return;
fbr.x = betoh(fbr.x);
fbr.y = betoh(fbr.y);
fbr.width = betoh(fbr.width);
fbr.height = betoh(fbr.height);
DPRINTF(VNC, " -- x = %d y = %d w = %d h = %d\n", fbr.x, fbr.y, fbr.width,
fbr.height);
sendFrameBufferUpdate();
}
void
VncServer::recvKeyboardInput()
{
DPRINTF(VNC, "Received keyboard input from client\n");
KeyEventMessage kem;
if (!read1((uint8_t *)&kem, sizeof(KeyEventMessage)))
return;
kem.key = betoh(kem.key);
DPRINTF(VNC, " -- received key code %d (%s)\n", kem.key, kem.down_flag ?
"down" : "up");
if (keyboard)
keyboard->keyPress(kem.key, kem.down_flag);
}
void
VncServer::recvPointerInput()
{
DPRINTF(VNC, "Received pointer input from client\n");
PointerEventMessage pem;
if (!read1((uint8_t *)&pem, sizeof(PointerEventMessage)))
return;
pem.x = betoh(pem.x);
pem.y = betoh(pem.y);
DPRINTF(VNC, " -- pointer at x = %d y = %d buttons = %#x\n", pem.x, pem.y,
pem.button_mask);
if (mouse)
mouse->mouseAt(pem.x, pem.y, pem.button_mask);
}
void
VncServer::recvCutText()
{
DPRINTF(VNC, "Received client copy buffer message\n");
ClientCutTextMessage cct;
if (!read1((uint8_t *)&cct, sizeof(ClientCutTextMessage)))
return;
char str[1025];
size_t data_len = betoh(cct.length);
DPRINTF(VNC, "String length %d\n", data_len);
while (data_len > 0) {
size_t bytes_to_read = data_len > 1024 ? 1024 : data_len;
if (!read((uint8_t *)&str, bytes_to_read))
return;
str[bytes_to_read] = 0;
data_len -= bytes_to_read;
DPRINTF(VNC, "Buffer: %s\n", str);
}
}
void
VncServer::sendFrameBufferUpdate()
{
if (dataFd <= 0 || curState != NormalPhase || !sendUpdate) {
DPRINTF(VNC, "NOT sending framebuffer update\n");
return;
}
// The client will request data constantly, unless we throttle it
sendUpdate = false;
DPRINTF(VNC, "Sending framebuffer update\n");
FrameBufferUpdate fbu;
FrameBufferRect fbr;
fbu.type = ServerFrameBufferUpdate;
fbu.num_rects = 1;
fbr.x = 0;
fbr.y = 0;
fbr.width = videoWidth();
fbr.height = videoHeight();
fbr.encoding = EncodingRaw;
// fix up endian
fbu.num_rects = htobe(fbu.num_rects);
fbr.x = htobe(fbr.x);
fbr.y = htobe(fbr.y);
fbr.width = htobe(fbr.width);
fbr.height = htobe(fbr.height);
fbr.encoding = htobe(fbr.encoding);
// send headers to client
if (!write(&fbu) || !write(&fbr))
return;
assert(fb);
std::vector<uint8_t> line_buffer(pixelConverter.length * fb->width());
for (int y = 0; y < fb->height(); ++y) {
// Convert and send a line at a time
uint8_t *raw_pixel(line_buffer.data());
for (unsigned x = 0; x < fb->width(); ++x) {
pixelConverter.fromPixel(raw_pixel, fb->pixel(x, y));
raw_pixel += pixelConverter.length;
}
if (!write(line_buffer.data(), line_buffer.size()))
return;
}
}
void
VncServer::sendFrameBufferResized()
{
assert(fb && dataFd > 0 && curState == NormalPhase);
DPRINTF(VNC, "Sending framebuffer resize\n");
FrameBufferUpdate fbu;
FrameBufferRect fbr;
fbu.type = ServerFrameBufferUpdate;
fbu.num_rects = 1;
fbr.x = 0;
fbr.y = 0;
fbr.width = videoWidth();
fbr.height = videoHeight();
fbr.encoding = EncodingDesktopSize;
// fix up endian
fbu.num_rects = htobe(fbu.num_rects);
fbr.x = htobe(fbr.x);
fbr.y = htobe(fbr.y);
fbr.width = htobe(fbr.width);
fbr.height = htobe(fbr.height);
fbr.encoding = htobe(fbr.encoding);
// send headers to client
if (!write(&fbu))
return;
write(&fbr);
// No actual data is sent in this message
}
void
VncServer::setDirty()
{
VncInput::setDirty();
sendUpdate = true;
sendFrameBufferUpdate();
}
void
VncServer::frameBufferResized()
{
if (dataFd > 0 && curState == NormalPhase) {
if (supportsResizeEnc)
sendFrameBufferResized();
else
// The frame buffer changed size and we can't update the client
detach();
}
}
// create the VNC server object
VncServer *
VncServerParams::create()
{
return new VncServer(this);
}