| 1 | /*
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| 2 | * synergy -- mouse and keyboard sharing utility
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| 3 | * Copyright (C) 2002 Chris Schoeneman
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| 4 | *
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| 5 | * This package is free software; you can redistribute it and/or
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| 6 | * modify it under the terms of the GNU General Public License
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| 7 | * found in the file COPYING that should have accompanied this file.
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| 8 | *
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| 9 | * This package is distributed in the hope that it will be useful,
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| 10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 12 | * GNU General Public License for more details.
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| 13 | */
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| 14 |
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| 15 | #include "CTCPSocket.h"
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| 16 | #include "CNetworkAddress.h"
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| 17 | #include "CSocketMultiplexer.h"
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| 18 | #include "TSocketMultiplexerMethodJob.h"
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| 19 | #include "XSocket.h"
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| 20 | #include "CLock.h"
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| 21 | #include "CLog.h"
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| 22 | #include "IEventQueue.h"
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| 23 | #include "IEventJob.h"
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| 24 | #include "CArch.h"
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| 25 | #include "XArch.h"
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| 26 | #include <string.h>
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| 27 |
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| 28 | //
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| 29 | // CTCPSocket
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| 30 | //
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| 31 |
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| 32 | CTCPSocket::CTCPSocket() :
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| 33 | m_mutex(),
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| 34 | m_flushed(&m_mutex, true)
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| 35 | {
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| 36 | try {
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| 37 | m_socket = ARCH->newSocket(IArchNetwork::kINET, IArchNetwork::kSTREAM);
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| 38 | }
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| 39 | catch (XArchNetwork& e) {
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| 40 | throw XSocketCreate(e.what());
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| 41 | }
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| 42 |
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| 43 | init();
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| 44 | }
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| 45 |
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| 46 | CTCPSocket::CTCPSocket(CArchSocket socket) :
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| 47 | m_mutex(),
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| 48 | m_socket(socket),
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| 49 | m_flushed(&m_mutex, true)
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| 50 | {
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| 51 | assert(m_socket != NULL);
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| 52 |
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| 53 | // socket starts in connected state
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| 54 | init();
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| 55 | onConnected();
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| 56 | setJob(newJob());
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| 57 | }
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| 58 |
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| 59 | CTCPSocket::~CTCPSocket()
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| 60 | {
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| 61 | try {
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| 62 | close();
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| 63 | }
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| 64 | catch (...) {
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| 65 | // ignore
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| 66 | }
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| 67 | }
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| 68 |
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| 69 | void
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| 70 | CTCPSocket::bind(const CNetworkAddress& addr)
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| 71 | {
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| 72 | try {
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| 73 | ARCH->bindSocket(m_socket, addr.getAddress());
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| 74 | }
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| 75 | catch (XArchNetworkAddressInUse& e) {
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| 76 | throw XSocketAddressInUse(e.what());
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| 77 | }
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| 78 | catch (XArchNetwork& e) {
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| 79 | throw XSocketBind(e.what());
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| 80 | }
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| 81 | }
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| 82 |
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| 83 | void
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| 84 | CTCPSocket::close()
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| 85 | {
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| 86 | // remove ourself from the multiplexer
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| 87 | setJob(NULL);
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| 88 |
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| 89 | CLock lock(&m_mutex);
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| 90 |
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| 91 | // clear buffers and enter disconnected state
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| 92 | if (m_connected) {
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| 93 | sendEvent(getDisconnectedEvent());
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| 94 | }
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| 95 | onDisconnected();
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| 96 |
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| 97 | // close the socket
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| 98 | if (m_socket != NULL) {
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| 99 | CArchSocket socket = m_socket;
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| 100 | m_socket = NULL;
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| 101 | try {
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| 102 | ARCH->closeSocket(socket);
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| 103 | }
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| 104 | catch (XArchNetwork& e) {
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| 105 | // ignore, there's not much we can do
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| 106 | LOG((CLOG_WARN "error closing socket: %s", e.what().c_str()));
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| 107 | }
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| 108 | }
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| 109 | }
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| 110 |
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| 111 | void*
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| 112 | CTCPSocket::getEventTarget() const
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| 113 | {
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| 114 | return const_cast<void*>(reinterpret_cast<const void*>(this));
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| 115 | }
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| 116 |
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| 117 | UInt32
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| 118 | CTCPSocket::read(void* buffer, UInt32 n)
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| 119 | {
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| 120 | // copy data directly from our input buffer
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| 121 | CLock lock(&m_mutex);
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| 122 | UInt32 size = m_inputBuffer.getSize();
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| 123 | if (n > size) {
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| 124 | n = size;
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| 125 | }
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| 126 | if (buffer != NULL) {
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| 127 | memcpy(buffer, m_inputBuffer.peek(n), n);
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| 128 | }
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| 129 | m_inputBuffer.pop(n);
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| 130 |
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| 131 | // if no more data and we cannot read or write then send disconnected
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| 132 | if (n > 0 && m_inputBuffer.getSize() == 0 && !m_readable && !m_writable) {
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| 133 | sendEvent(getDisconnectedEvent());
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| 134 | m_connected = false;
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| 135 | }
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| 136 |
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| 137 | return n;
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| 138 | }
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| 139 |
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| 140 | void
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| 141 | CTCPSocket::write(const void* buffer, UInt32 n)
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| 142 | {
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| 143 | bool wasEmpty;
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| 144 | {
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| 145 | CLock lock(&m_mutex);
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| 146 |
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| 147 | // must not have shutdown output
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| 148 | if (!m_writable) {
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| 149 | sendEvent(getOutputErrorEvent());
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| 150 | return;
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| 151 | }
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| 152 |
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| 153 | // ignore empty writes
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| 154 | if (n == 0) {
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| 155 | return;
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| 156 | }
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| 157 |
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| 158 | // copy data to the output buffer
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| 159 | wasEmpty = (m_outputBuffer.getSize() == 0);
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| 160 | m_outputBuffer.write(buffer, n);
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| 161 |
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| 162 | // there's data to write
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| 163 | m_flushed = false;
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| 164 | }
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| 165 |
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| 166 | // make sure we're waiting to write
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| 167 | if (wasEmpty) {
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| 168 | setJob(newJob());
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| 169 | }
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| 170 | }
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| 171 |
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| 172 | void
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| 173 | CTCPSocket::flush()
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| 174 | {
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| 175 | CLock lock(&m_mutex);
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| 176 | while (m_flushed == false) {
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| 177 | m_flushed.wait();
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| 178 | }
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| 179 | }
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| 180 |
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| 181 | void
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| 182 | CTCPSocket::shutdownInput()
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| 183 | {
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| 184 | bool useNewJob = false;
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| 185 | {
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| 186 | CLock lock(&m_mutex);
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| 187 |
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| 188 | // shutdown socket for reading
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| 189 | try {
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| 190 | ARCH->closeSocketForRead(m_socket);
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| 191 | }
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| 192 | catch (XArchNetwork&) {
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| 193 | // ignore
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| 194 | }
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| 195 |
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| 196 | // shutdown buffer for reading
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| 197 | if (m_readable) {
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| 198 | sendEvent(getInputShutdownEvent());
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| 199 | onInputShutdown();
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| 200 | useNewJob = true;
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| 201 | }
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| 202 | }
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| 203 | if (useNewJob) {
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| 204 | setJob(newJob());
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| 205 | }
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| 206 | }
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| 207 |
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| 208 | void
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| 209 | CTCPSocket::shutdownOutput()
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| 210 | {
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| 211 | bool useNewJob = false;
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| 212 | {
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| 213 | CLock lock(&m_mutex);
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| 214 |
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| 215 | // shutdown socket for writing
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| 216 | try {
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| 217 | ARCH->closeSocketForWrite(m_socket);
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| 218 | }
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| 219 | catch (XArchNetwork&) {
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| 220 | // ignore
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| 221 | }
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| 222 |
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| 223 | // shutdown buffer for writing
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| 224 | if (m_writable) {
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| 225 | sendEvent(getOutputShutdownEvent());
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| 226 | onOutputShutdown();
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| 227 | useNewJob = true;
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| 228 | }
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| 229 | }
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| 230 | if (useNewJob) {
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| 231 | setJob(newJob());
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| 232 | }
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| 233 | }
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| 234 |
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| 235 | bool
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| 236 | CTCPSocket::isReady() const
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| 237 | {
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| 238 | CLock lock(&m_mutex);
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| 239 | return (m_inputBuffer.getSize() > 0);
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| 240 | }
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| 241 |
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| 242 | UInt32
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| 243 | CTCPSocket::getSize() const
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| 244 | {
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| 245 | CLock lock(&m_mutex);
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| 246 | return m_inputBuffer.getSize();
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| 247 | }
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| 248 |
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| 249 | void
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| 250 | CTCPSocket::connect(const CNetworkAddress& addr)
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| 251 | {
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| 252 | {
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| 253 | CLock lock(&m_mutex);
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| 254 |
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| 255 | // fail on attempts to reconnect
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| 256 | if (m_socket == NULL || m_connected) {
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| 257 | sendConnectionFailedEvent("busy");
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| 258 | return;
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| 259 | }
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| 260 |
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| 261 | try {
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| 262 | if (ARCH->connectSocket(m_socket, addr.getAddress())) {
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| 263 | sendEvent(getConnectedEvent());
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| 264 | onConnected();
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| 265 | }
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| 266 | else {
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| 267 | // connection is in progress
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| 268 | m_writable = true;
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| 269 | }
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| 270 | }
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| 271 | catch (XArchNetwork& e) {
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| 272 | throw XSocketConnect(e.what());
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| 273 | }
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| 274 | }
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| 275 | setJob(newJob());
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| 276 | }
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| 277 |
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| 278 | void
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| 279 | CTCPSocket::init()
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| 280 | {
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| 281 | // default state
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| 282 | m_connected = false;
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| 283 | m_readable = false;
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| 284 | m_writable = false;
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| 285 |
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| 286 | try {
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| 287 | // turn off Nagle algorithm. we send lots of very short messages
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| 288 | // that should be sent without (much) delay. for example, the
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| 289 | // mouse motion messages are much less useful if they're delayed.
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| 290 | ARCH->setNoDelayOnSocket(m_socket, true);
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| 291 | }
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| 292 | catch (XArchNetwork& e) {
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| 293 | try {
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| 294 | ARCH->closeSocket(m_socket);
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| 295 | m_socket = NULL;
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| 296 | }
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| 297 | catch (XArchNetwork&) {
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| 298 | // ignore
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| 299 | }
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| 300 | throw XSocketCreate(e.what());
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| 301 | }
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| 302 | }
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| 303 |
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| 304 | void
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| 305 | CTCPSocket::setJob(ISocketMultiplexerJob* job)
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| 306 | {
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| 307 | // multiplexer will delete the old job
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| 308 | if (job == NULL) {
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| 309 | CSocketMultiplexer::getInstance()->removeSocket(this);
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| 310 | }
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| 311 | else {
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| 312 | CSocketMultiplexer::getInstance()->addSocket(this, job);
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| 313 | }
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| 314 | }
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| 315 |
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| 316 | ISocketMultiplexerJob*
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| 317 | CTCPSocket::newJob()
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| 318 | {
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| 319 | // note -- must have m_mutex locked on entry
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| 320 |
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| 321 | if (m_socket == NULL) {
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| 322 | return NULL;
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| 323 | }
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| 324 | else if (!m_connected) {
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| 325 | assert(!m_readable);
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| 326 | if (!(m_readable || m_writable)) {
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| 327 | return NULL;
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| 328 | }
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| 329 | return new TSocketMultiplexerMethodJob<CTCPSocket>(
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| 330 | this, &CTCPSocket::serviceConnecting,
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| 331 | m_socket, m_readable, m_writable);
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| 332 | }
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| 333 | else {
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| 334 | if (!(m_readable || (m_writable && (m_outputBuffer.getSize() > 0)))) {
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| 335 | return NULL;
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| 336 | }
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| 337 | return new TSocketMultiplexerMethodJob<CTCPSocket>(
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| 338 | this, &CTCPSocket::serviceConnected,
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| 339 | m_socket, m_readable,
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| 340 | m_writable && (m_outputBuffer.getSize() > 0));
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| 341 | }
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| 342 | }
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| 343 |
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| 344 | void
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| 345 | CTCPSocket::sendConnectionFailedEvent(const char* msg)
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| 346 | {
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| 347 | CConnectionFailedInfo* info = (CConnectionFailedInfo*)malloc(
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| 348 | sizeof(CConnectionFailedInfo) + strlen(msg));
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| 349 | strcpy(info->m_what, msg);
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| 350 | EVENTQUEUE->addEvent(CEvent(getConnectionFailedEvent(),
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| 351 | getEventTarget(), info));
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| 352 | }
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| 353 |
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| 354 | void
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| 355 | CTCPSocket::sendEvent(CEvent::Type type)
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| 356 | {
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| 357 | EVENTQUEUE->addEvent(CEvent(type, getEventTarget(), NULL));
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| 358 | }
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| 359 |
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| 360 | void
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| 361 | CTCPSocket::onConnected()
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| 362 | {
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| 363 | m_connected = true;
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| 364 | m_readable = true;
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| 365 | m_writable = true;
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| 366 | }
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| 367 |
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| 368 | void
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| 369 | CTCPSocket::onInputShutdown()
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| 370 | {
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| 371 | m_inputBuffer.pop(m_inputBuffer.getSize());
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| 372 | m_readable = false;
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| 373 | }
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| 374 |
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| 375 | void
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| 376 | CTCPSocket::onOutputShutdown()
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| 377 | {
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| 378 | m_outputBuffer.pop(m_outputBuffer.getSize());
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| 379 | m_writable = false;
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| 380 |
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| 381 | // we're now flushed
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| 382 | m_flushed = true;
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| 383 | m_flushed.broadcast();
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| 384 | }
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| 385 |
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| 386 | void
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| 387 | CTCPSocket::onDisconnected()
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| 388 | {
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| 389 | // disconnected
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| 390 | onInputShutdown();
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| 391 | onOutputShutdown();
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| 392 | m_connected = false;
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| 393 | }
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| 394 |
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| 395 | ISocketMultiplexerJob*
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| 396 | CTCPSocket::serviceConnecting(ISocketMultiplexerJob* job,
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| 397 | bool, bool write, bool error)
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| 398 | {
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| 399 | CLock lock(&m_mutex);
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| 400 |
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| 401 | // should only check for errors if error is true but checking a new
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| 402 | // socket (and a socket that's connecting should be new) for errors
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| 403 | // should be safe and Mac OS X appears to have a bug where a
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| 404 | // non-blocking stream socket that fails to connect immediately is
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| 405 | // reported by select as being writable (i.e. connected) even when
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| 406 | // the connection has failed. this is easily demonstrated on OS X
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| 407 | // 10.3.4 by starting a synergy client and telling to connect to
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| 408 | // another system that's not running a synergy server. it will
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| 409 | // claim to have connected then quickly disconnect (i guess because
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| 410 | // read returns 0 bytes). unfortunately, synergy attempts to
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| 411 | // reconnect immediately, the process repeats and we end up
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| 412 | // spinning the CPU. luckily, OS X does set SO_ERROR on the
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| 413 | // socket correctly when the connection has failed so checking for
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| 414 | // errors works. (curiously, sometimes OS X doesn't report
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| 415 | // connection refused. when that happens it at least doesn't
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| 416 | // report the socket as being writable so synergy is able to time
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| 417 | // out the attempt.)
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| 418 | if (error || true) {
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| 419 | try {
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| 420 | // connection may have failed or succeeded
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| 421 | ARCH->throwErrorOnSocket(m_socket);
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| 422 | }
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| 423 | catch (XArchNetwork& e) {
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| 424 | sendConnectionFailedEvent(e.what().c_str());
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| 425 | onDisconnected();
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| 426 | return newJob();
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| 427 | }
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| 428 | }
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| 429 |
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| 430 | if (write) {
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| 431 | sendEvent(getConnectedEvent());
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| 432 | onConnected();
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| 433 | return newJob();
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| 434 | }
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| 435 |
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| 436 | return job;
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| 437 | }
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| 438 |
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| 439 | ISocketMultiplexerJob*
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| 440 | CTCPSocket::serviceConnected(ISocketMultiplexerJob* job,
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| 441 | bool read, bool write, bool error)
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| 442 | {
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| 443 | CLock lock(&m_mutex);
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| 444 |
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| 445 | if (error) {
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| 446 | sendEvent(getDisconnectedEvent());
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| 447 | onDisconnected();
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| 448 | return newJob();
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| 449 | }
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| 450 |
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| 451 | bool needNewJob = false;
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| 452 |
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| 453 | if (write) {
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| 454 | try {
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| 455 | // write data
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| 456 | UInt32 n = m_outputBuffer.getSize();
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| 457 | const void* buffer = m_outputBuffer.peek(n);
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| 458 | n = (UInt32)ARCH->writeSocket(m_socket, buffer, n);
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| 459 |
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| 460 | // discard written data
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| 461 | if (n > 0) {
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| 462 | m_outputBuffer.pop(n);
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| 463 | if (m_outputBuffer.getSize() == 0) {
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| 464 | sendEvent(getOutputFlushedEvent());
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| 465 | m_flushed = true;
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| 466 | m_flushed.broadcast();
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| 467 | needNewJob = true;
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| 468 | }
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| 469 | }
|
|---|
| 470 | }
|
|---|
| 471 | catch (XArchNetworkShutdown&) {
|
|---|
| 472 | // remote read end of stream hungup. our output side
|
|---|
| 473 | // has therefore shutdown.
|
|---|
| 474 | onOutputShutdown();
|
|---|
| 475 | sendEvent(getOutputShutdownEvent());
|
|---|
| 476 | if (!m_readable && m_inputBuffer.getSize() == 0) {
|
|---|
| 477 | sendEvent(getDisconnectedEvent());
|
|---|
| 478 | m_connected = false;
|
|---|
| 479 | }
|
|---|
| 480 | needNewJob = true;
|
|---|
| 481 | }
|
|---|
| 482 | catch (XArchNetworkDisconnected&) {
|
|---|
| 483 | // stream hungup
|
|---|
| 484 | onDisconnected();
|
|---|
| 485 | sendEvent(getDisconnectedEvent());
|
|---|
| 486 | needNewJob = true;
|
|---|
| 487 | }
|
|---|
| 488 | catch (XArchNetwork& e) {
|
|---|
| 489 | // other write error
|
|---|
| 490 | LOG((CLOG_WARN "error writing socket: %s", e.what().c_str()));
|
|---|
| 491 | onDisconnected();
|
|---|
| 492 | sendEvent(getOutputErrorEvent());
|
|---|
| 493 | sendEvent(getDisconnectedEvent());
|
|---|
| 494 | needNewJob = true;
|
|---|
| 495 | }
|
|---|
| 496 | }
|
|---|
| 497 |
|
|---|
| 498 | if (read && m_readable) {
|
|---|
| 499 | try {
|
|---|
| 500 | UInt8 buffer[4096];
|
|---|
| 501 | size_t n = ARCH->readSocket(m_socket, buffer, sizeof(buffer));
|
|---|
| 502 | if (n > 0) {
|
|---|
| 503 | bool wasEmpty = (m_inputBuffer.getSize() == 0);
|
|---|
| 504 |
|
|---|
| 505 | // slurp up as much as possible
|
|---|
| 506 | do {
|
|---|
| 507 | m_inputBuffer.write(buffer, n);
|
|---|
| 508 | n = ARCH->readSocket(m_socket, buffer, sizeof(buffer));
|
|---|
| 509 | } while (n > 0);
|
|---|
| 510 |
|
|---|
| 511 | // send input ready if input buffer was empty
|
|---|
| 512 | if (wasEmpty) {
|
|---|
| 513 | sendEvent(getInputReadyEvent());
|
|---|
| 514 | }
|
|---|
| 515 | }
|
|---|
| 516 | else {
|
|---|
| 517 | // remote write end of stream hungup. our input side
|
|---|
| 518 | // has therefore shutdown but don't flush our buffer
|
|---|
| 519 | // since there's still data to be read.
|
|---|
| 520 | sendEvent(getInputShutdownEvent());
|
|---|
| 521 | if (!m_writable && m_inputBuffer.getSize() == 0) {
|
|---|
| 522 | sendEvent(getDisconnectedEvent());
|
|---|
| 523 | m_connected = false;
|
|---|
| 524 | }
|
|---|
| 525 | m_readable = false;
|
|---|
| 526 | needNewJob = true;
|
|---|
| 527 | }
|
|---|
| 528 | }
|
|---|
| 529 | catch (XArchNetworkDisconnected&) {
|
|---|
| 530 | // stream hungup
|
|---|
| 531 | sendEvent(getDisconnectedEvent());
|
|---|
| 532 | onDisconnected();
|
|---|
| 533 | needNewJob = true;
|
|---|
| 534 | }
|
|---|
| 535 | catch (XArchNetwork& e) {
|
|---|
| 536 | // ignore other read error
|
|---|
| 537 | LOG((CLOG_WARN "error reading socket: %s", e.what().c_str()));
|
|---|
| 538 | }
|
|---|
| 539 | }
|
|---|
| 540 |
|
|---|
| 541 | return needNewJob ? newJob() : job;
|
|---|
| 542 | }
|
|---|
