Alexandre Lision | ddd731e | 2014-01-31 11:50:08 -0500 | [diff] [blame] | 1 | // Copyright (C) 2010 David Sugar, Tycho Softworks. |
| 2 | // |
| 3 | // This file is part of GNU uCommon C++. |
| 4 | // |
| 5 | // GNU uCommon C++ is free software: you can redistribute it and/or modify |
| 6 | // it under the terms of the GNU Lesser General Public License as published |
| 7 | // by the Free Software Foundation, either version 3 of the License, or |
| 8 | // (at your option) any later version. |
| 9 | // |
| 10 | // GNU uCommon C++ is distributed in the hope that it will be useful, |
| 11 | // but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 13 | // GNU Lesser General Public License for more details. |
| 14 | // |
| 15 | // You should have received a copy of the GNU Lesser General Public License |
| 16 | // along with GNU uCommon C++. If not, see <http://www.gnu.org/licenses/>. |
| 17 | |
| 18 | #include <ucommon-config.h> |
| 19 | #include <ucommon/export.h> |
| 20 | #include <ucommon/protocols.h> |
| 21 | #include <ucommon/socket.h> |
| 22 | #include <ucommon/timers.h> |
| 23 | #include <ucommon/buffer.h> |
| 24 | #include <ucommon/string.h> |
| 25 | #include <ucommon/shell.h> |
| 26 | |
| 27 | using namespace UCOMMON_NAMESPACE; |
| 28 | |
| 29 | TCPBuffer::TCPBuffer() : |
| 30 | BufferProtocol() |
| 31 | { |
| 32 | so = INVALID_SOCKET; |
| 33 | } |
| 34 | |
| 35 | TCPBuffer::TCPBuffer(const char *host, const char *service, size_t size) : |
| 36 | BufferProtocol() |
| 37 | { |
| 38 | so = INVALID_SOCKET; |
| 39 | open(host, service, size); |
| 40 | } |
| 41 | |
| 42 | TCPBuffer::TCPBuffer(const TCPServer *server, size_t size) : |
| 43 | BufferProtocol() |
| 44 | { |
| 45 | so = INVALID_SOCKET; |
| 46 | open(server, size); |
| 47 | } |
| 48 | |
| 49 | TCPBuffer::~TCPBuffer() |
| 50 | { |
| 51 | TCPBuffer::close(); |
| 52 | } |
| 53 | |
| 54 | void TCPBuffer::open(const char *host, const char *service, size_t size) |
| 55 | { |
| 56 | struct addrinfo *list = Socket::query(host, service, SOCK_STREAM, 0); |
| 57 | if(!list) |
| 58 | return; |
| 59 | |
| 60 | so = Socket::create(list, SOCK_STREAM, 0); |
| 61 | Socket::release(list); |
| 62 | if(so == INVALID_SOCKET) |
| 63 | return; |
| 64 | |
| 65 | _buffer(size); |
| 66 | } |
| 67 | |
| 68 | void TCPBuffer::open(const TCPServer *server, size_t size) |
| 69 | { |
| 70 | close(); |
| 71 | so = server->accept(); |
| 72 | if(so == INVALID_SOCKET) |
| 73 | return; |
| 74 | |
| 75 | _buffer(size); |
| 76 | } |
| 77 | |
| 78 | void TCPBuffer::close(void) |
| 79 | { |
| 80 | if(so == INVALID_SOCKET) |
| 81 | return; |
| 82 | |
| 83 | BufferProtocol::release(); |
| 84 | Socket::release(so); |
| 85 | so = INVALID_SOCKET; |
| 86 | } |
| 87 | |
| 88 | void TCPBuffer::_buffer(size_t size) |
| 89 | { |
| 90 | unsigned iobuf = 0; |
| 91 | unsigned mss = size; |
| 92 | unsigned max = 0; |
| 93 | |
| 94 | #ifdef TCP_MAXSEG |
| 95 | socklen_t alen = sizeof(max); |
| 96 | #endif |
| 97 | |
| 98 | if(size < 80) { |
| 99 | allocate(size); |
| 100 | return; |
| 101 | } |
| 102 | |
| 103 | #ifdef TCP_MAXSEG |
| 104 | if(mss) |
| 105 | setsockopt(so, IPPROTO_TCP, TCP_MAXSEG, (char *)&max, sizeof(max)); |
| 106 | getsockopt(so, IPPROTO_TCP, TCP_MAXSEG, (char *)&max, &alen); |
| 107 | #endif |
| 108 | |
| 109 | if(max && max < mss) |
| 110 | mss = max; |
| 111 | |
| 112 | if(!mss) { |
| 113 | if(max) |
| 114 | mss = max; |
| 115 | else |
| 116 | mss = 536; |
| 117 | goto alloc; |
| 118 | } |
| 119 | |
| 120 | if(mss < 80) |
| 121 | mss = 80; |
| 122 | |
| 123 | if(mss * 7 < 64000u) |
| 124 | iobuf = mss * 7; |
| 125 | else if(size * 6 < 64000u) |
| 126 | iobuf = mss * 6; |
| 127 | else |
| 128 | iobuf = mss * 5; |
| 129 | |
| 130 | Socket::sendsize(so, iobuf); |
| 131 | Socket::recvsize(so, iobuf); |
| 132 | |
| 133 | if(mss < 512) |
| 134 | Socket::sendwait(so, mss * 4); |
| 135 | |
| 136 | alloc: |
| 137 | allocate(size); |
| 138 | } |
| 139 | |
| 140 | int TCPBuffer::_err(void) const |
| 141 | { |
| 142 | return ioerr; |
| 143 | } |
| 144 | |
| 145 | void TCPBuffer::_clear(void) |
| 146 | { |
| 147 | ioerr = 0; |
| 148 | } |
| 149 | |
| 150 | bool TCPBuffer::_blocking(void) |
| 151 | { |
| 152 | if(iowait) |
| 153 | return true; |
| 154 | |
| 155 | return false; |
| 156 | } |
| 157 | |
| 158 | size_t TCPBuffer::_push(const char *address, size_t len) |
| 159 | { |
| 160 | if(ioerr) |
| 161 | return 0; |
| 162 | |
| 163 | ssize_t result = writeto(address, len); |
| 164 | if(result < 0) |
| 165 | result = 0; |
| 166 | |
| 167 | return (size_t)result; |
| 168 | } |
| 169 | |
| 170 | size_t TCPBuffer::_pull(char *address, size_t len) |
| 171 | { |
| 172 | ssize_t result; |
| 173 | |
| 174 | result = readfrom(address, len); |
| 175 | |
| 176 | if(result < 0) |
| 177 | result = 0; |
| 178 | return (size_t)result; |
| 179 | } |
| 180 | |
| 181 | bool TCPBuffer::_pending(void) |
| 182 | { |
| 183 | if(input_pending()) |
| 184 | return true; |
| 185 | |
| 186 | if(is_input() && iowait && iowait != Timer::inf) |
| 187 | return Socket::wait(so, iowait); |
| 188 | |
| 189 | return Socket::wait(so, 0); |
| 190 | } |