784 lines
15 KiB
C
784 lines
15 KiB
C
/**
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* FreeRDP: A Remote Desktop Protocol Implementation
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* Transmission Control Protocol (TCP)
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*
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* Copyright 2011 Vic Lee
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* Copyright 2011 Marc-Andre Moreau <marcandre.moreau@gmail.com>
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <time.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <winpr/crt.h>
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#include <winpr/winsock.h>
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#ifndef _WIN32
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#include <netdb.h>
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#include <unistd.h>
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#include <sys/ioctl.h>
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#include <sys/socket.h>
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#include <netinet/in.h>
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#include <netinet/tcp.h>
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#include <net/if.h>
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#ifdef __FreeBSD__
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#ifndef SOL_TCP
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#define SOL_TCP IPPROTO_TCP
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#endif
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#endif
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#ifdef __APPLE__
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#ifndef SOL_TCP
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#define SOL_TCP IPPROTO_TCP
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#endif
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#ifndef TCP_KEEPIDLE
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#define TCP_KEEPIDLE TCP_KEEPALIVE
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#endif
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#endif
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#endif
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#include <freerdp/utils/tcp.h>
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#include <freerdp/utils/uds.h>
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#include <winpr/stream.h>
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#include "tcp.h"
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/* Simple Socket BIO */
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static int transport_bio_simple_new(BIO* bio);
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static int transport_bio_simple_free(BIO* bio);
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long transport_bio_simple_callback(BIO* bio, int mode, const char* argp, int argi, long argl, long ret)
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{
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return 1;
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}
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static int transport_bio_simple_write(BIO* bio, const char* buf, int size)
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{
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int error;
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int status = 0;
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if (!buf)
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return 0;
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BIO_clear_flags(bio, BIO_FLAGS_WRITE);
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status = _send((SOCKET) bio->num, buf, size, 0);
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if (status <= 0)
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{
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error = WSAGetLastError();
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if ((error == WSAEWOULDBLOCK) || (error == WSAEINTR) ||
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(error == WSAEINPROGRESS) || (error == WSAEALREADY))
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{
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BIO_set_flags(bio, (BIO_FLAGS_WRITE | BIO_FLAGS_SHOULD_RETRY));
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}
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else
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{
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BIO_clear_flags(bio, BIO_FLAGS_SHOULD_RETRY);
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}
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}
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return status;
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}
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static int transport_bio_simple_read(BIO* bio, char* buf, int size)
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{
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int error;
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int status = 0;
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if (!buf)
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return 0;
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BIO_clear_flags(bio, BIO_FLAGS_READ);
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status = _recv((SOCKET) bio->num, buf, size, 0);
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if (status <= 0)
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{
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error = WSAGetLastError();
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if ((error == WSAEWOULDBLOCK) || (error == WSAEINTR) ||
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(error == WSAEINPROGRESS) || (error == WSAEALREADY))
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{
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BIO_set_flags(bio, (BIO_FLAGS_READ | BIO_FLAGS_SHOULD_RETRY));
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}
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else
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{
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BIO_clear_flags(bio, BIO_FLAGS_SHOULD_RETRY);
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}
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}
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return status;
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}
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static int transport_bio_simple_puts(BIO* bio, const char* str)
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{
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return 1;
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}
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static int transport_bio_simple_gets(BIO* bio, char* str, int size)
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{
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return 1;
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}
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static long transport_bio_simple_ctrl(BIO* bio, int cmd, long arg1, void* arg2)
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{
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int status = -1;
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switch (cmd)
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{
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case BIO_C_SET_FD:
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if (arg2)
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{
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transport_bio_simple_free(bio);
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bio->flags = BIO_FLAGS_SHOULD_RETRY;
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bio->num = *((int*) arg2);
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bio->shutdown = (int) arg1;
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bio->init = 1;
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status = 1;
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}
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break;
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case BIO_C_GET_FD:
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if (bio->init)
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{
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if (arg2)
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*((int*) arg2) = bio->num;
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status = bio->num;
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}
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break;
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case BIO_CTRL_GET_CLOSE:
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status = bio->shutdown;
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break;
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case BIO_CTRL_SET_CLOSE:
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bio->shutdown = (int) arg1;
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status = 1;
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break;
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case BIO_CTRL_DUP:
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status = 1;
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break;
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case BIO_CTRL_FLUSH:
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status = 1;
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break;
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default:
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status = 0;
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break;
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}
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return status;
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}
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static int transport_bio_simple_new(BIO* bio)
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{
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bio->init = 0;
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bio->num = 0;
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bio->ptr = NULL;
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bio->flags = BIO_FLAGS_SHOULD_RETRY;
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return 1;
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}
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static int transport_bio_simple_free(BIO* bio)
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{
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if (!bio)
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return 0;
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if (bio->shutdown)
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{
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if (bio->init)
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closesocket((SOCKET) bio->num);
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bio->init = 0;
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bio->flags = 0;
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}
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return 1;
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}
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static BIO_METHOD transport_bio_simple_socket_methods =
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{
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BIO_TYPE_SIMPLE,
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"SimpleSocket",
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transport_bio_simple_write,
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transport_bio_simple_read,
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transport_bio_simple_puts,
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transport_bio_simple_gets,
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transport_bio_simple_ctrl,
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transport_bio_simple_new,
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transport_bio_simple_free,
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NULL,
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};
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BIO_METHOD* BIO_s_simple_socket(void)
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{
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return &transport_bio_simple_socket_methods;
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}
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/* Buffered Socket BIO */
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long transport_bio_buffered_callback(BIO* bio, int mode, const char* argp, int argi, long argl, long ret)
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{
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return 1;
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}
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static int transport_bio_buffered_write(BIO* bio, const char* buf, int num)
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{
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int status, ret;
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rdpTcp* tcp = (rdpTcp*) bio->ptr;
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int nchunks, committedBytes, i;
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DataChunk chunks[2];
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ret = num;
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tcp->writeBlocked = FALSE;
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BIO_clear_flags(bio, BIO_FLAGS_WRITE);
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/* we directly append extra bytes in the xmit buffer, this could be prevented
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* but for now it makes the code more simple.
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*/
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if (buf && num && !ringbuffer_write(&tcp->xmitBuffer, (const BYTE*) buf, num))
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{
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fprintf(stderr, "%s: an error occured when writing(toWrite=%d)\n", __FUNCTION__, num);
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return -1;
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}
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committedBytes = 0;
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nchunks = ringbuffer_peek(&tcp->xmitBuffer, chunks, ringbuffer_used(&tcp->xmitBuffer));
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for (i = 0; i < nchunks; i++)
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{
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while (chunks[i].size)
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{
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status = BIO_write(bio->next_bio, chunks[i].data, chunks[i].size);
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if (status <= 0)
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{
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if (!BIO_should_retry(bio->next_bio))
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{
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BIO_clear_flags(bio, BIO_FLAGS_SHOULD_RETRY);
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ret = -1; /* fatal error */
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goto out;
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}
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if (BIO_should_write(bio->next_bio))
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{
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BIO_set_flags(bio, BIO_FLAGS_WRITE);
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tcp->writeBlocked = TRUE;
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goto out; /* EWOULDBLOCK */
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}
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}
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committedBytes += status;
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chunks[i].size -= status;
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chunks[i].data += status;
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}
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}
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out:
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ringbuffer_commit_read_bytes(&tcp->xmitBuffer, committedBytes);
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return ret;
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}
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static int transport_bio_buffered_read(BIO* bio, char* buf, int size)
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{
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int status;
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rdpTcp* tcp = (rdpTcp*) bio->ptr;
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tcp->readBlocked = FALSE;
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BIO_clear_flags(bio, BIO_FLAGS_READ);
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status = BIO_read(bio->next_bio, buf, size);
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if (status <= 0)
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{
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if (!BIO_should_retry(bio->next_bio))
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{
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BIO_clear_flags(bio, BIO_FLAGS_SHOULD_RETRY);
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status = -1;
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goto out;
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}
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BIO_set_flags(bio, BIO_FLAGS_SHOULD_RETRY);
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if (BIO_should_read(bio->next_bio))
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{
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BIO_set_flags(bio, BIO_FLAGS_READ);
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tcp->readBlocked = TRUE;
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goto out;
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}
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}
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out:
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return status;
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}
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static int transport_bio_buffered_puts(BIO* bio, const char* str)
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{
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return 1;
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}
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static int transport_bio_buffered_gets(BIO* bio, char* str, int size)
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{
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return 1;
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}
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static long transport_bio_buffered_ctrl(BIO* bio, int cmd, long arg1, void* arg2)
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{
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rdpTcp* tcp = (rdpTcp*) bio->ptr;
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switch (cmd)
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{
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case BIO_CTRL_FLUSH:
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return 1;
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case BIO_CTRL_WPENDING:
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return ringbuffer_used(&tcp->xmitBuffer);
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case BIO_CTRL_PENDING:
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return 0;
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default:
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return BIO_ctrl(bio->next_bio, cmd, arg1, arg2);
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}
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return 0;
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}
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static int transport_bio_buffered_new(BIO* bio)
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{
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bio->init = 1;
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bio->num = 0;
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bio->ptr = NULL;
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bio->flags = BIO_FLAGS_SHOULD_RETRY;
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return 1;
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}
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static int transport_bio_buffered_free(BIO* bio)
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{
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return 1;
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}
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static BIO_METHOD transport_bio_buffered_socket_methods =
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{
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BIO_TYPE_BUFFERED,
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"BufferedSocket",
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transport_bio_buffered_write,
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transport_bio_buffered_read,
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transport_bio_buffered_puts,
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transport_bio_buffered_gets,
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transport_bio_buffered_ctrl,
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transport_bio_buffered_new,
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transport_bio_buffered_free,
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NULL,
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};
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BIO_METHOD* BIO_s_buffered_socket(void)
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{
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return &transport_bio_buffered_socket_methods;
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}
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BOOL transport_bio_buffered_drain(BIO *bio)
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{
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int status;
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rdpTcp* tcp = (rdpTcp*) bio->ptr;
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if (!ringbuffer_used(&tcp->xmitBuffer))
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return 1;
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status = transport_bio_buffered_write(bio, NULL, 0);
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return status >= 0;
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}
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void tcp_get_ip_address(rdpTcp* tcp)
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{
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BYTE* ip;
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socklen_t length;
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struct sockaddr_in sockaddr;
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length = sizeof(sockaddr);
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ZeroMemory(&sockaddr, length);
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if (getsockname(tcp->sockfd, (struct sockaddr*) &sockaddr, &length) == 0)
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{
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ip = (BYTE*) (&sockaddr.sin_addr);
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sprintf_s(tcp->ip_address, sizeof(tcp->ip_address),
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"%u.%u.%u.%u", ip[0], ip[1], ip[2], ip[3]);
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}
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else
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{
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strcpy(tcp->ip_address, "127.0.0.1");
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}
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tcp->settings->IPv6Enabled = 0;
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free(tcp->settings->ClientAddress);
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tcp->settings->ClientAddress = _strdup(tcp->ip_address);
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}
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void tcp_get_mac_address(rdpTcp* tcp)
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{
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#ifdef LINUX
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BYTE* mac;
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struct ifreq if_req;
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struct if_nameindex* ni;
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ni = if_nameindex();
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mac = tcp->mac_address;
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while (ni->if_name != NULL)
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{
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if (strcmp(ni->if_name, "lo") != 0)
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break;
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ni++;
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}
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strncpy(if_req.ifr_name, ni->if_name, IF_NAMESIZE);
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if (ioctl(tcp->sockfd, SIOCGIFHWADDR, &if_req) != 0)
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{
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fprintf(stderr, "failed to obtain MAC address\n");
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return;
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}
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memmove((void*) mac, (void*) &if_req.ifr_ifru.ifru_hwaddr.sa_data[0], 6);
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#endif
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/* fprintf(stderr, "MAC: %02X:%02X:%02X:%02X:%02X:%02X\n",
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mac[0], mac[1], mac[2], mac[3], mac[4], mac[5]); */
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}
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|
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BOOL tcp_connect(rdpTcp* tcp, const char* hostname, int port, int timeout)
|
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{
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int status;
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UINT32 option_value;
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socklen_t option_len;
|
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|
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if (!hostname)
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return FALSE;
|
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|
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if (hostname[0] == '/')
|
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{
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tcp->sockfd = freerdp_uds_connect(hostname);
|
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|
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if (tcp->sockfd < 0)
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return FALSE;
|
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|
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tcp->socketBio = BIO_new_fd(tcp->sockfd, 1);
|
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|
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if (!tcp->socketBio)
|
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return FALSE;
|
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}
|
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else
|
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{
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fd_set cfds;
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struct timeval tv;
|
|
|
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tcp->socketBio = BIO_new(BIO_s_connect());
|
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|
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if (!tcp->socketBio)
|
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return FALSE;
|
|
|
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if (BIO_set_conn_hostname(tcp->socketBio, hostname) < 0 || BIO_set_conn_int_port(tcp->socketBio, &port) < 0)
|
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return FALSE;
|
|
|
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BIO_set_nbio(tcp->socketBio, 1);
|
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|
|
status = BIO_do_connect(tcp->socketBio);
|
|
|
|
if ((status <= 0) && !BIO_should_retry(tcp->socketBio))
|
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return FALSE;
|
|
|
|
tcp->sockfd = BIO_get_fd(tcp->socketBio, NULL);
|
|
|
|
if (tcp->sockfd < 0)
|
|
return FALSE;
|
|
|
|
if (status <= 0)
|
|
{
|
|
FD_ZERO(&cfds);
|
|
FD_SET(tcp->sockfd, &cfds);
|
|
|
|
tv.tv_sec = timeout;
|
|
tv.tv_usec = 0;
|
|
|
|
status = select(tcp->sockfd + 1, NULL, &cfds, NULL, &tv);
|
|
|
|
if (status == 0)
|
|
{
|
|
return FALSE; /* timeout */
|
|
}
|
|
}
|
|
|
|
BIO_set_close(tcp->socketBio, BIO_NOCLOSE);
|
|
BIO_free(tcp->socketBio);
|
|
|
|
tcp->socketBio = BIO_new(BIO_s_simple_socket());
|
|
|
|
if (!tcp->socketBio)
|
|
return -1;
|
|
|
|
BIO_set_fd(tcp->socketBio, tcp->sockfd, BIO_CLOSE);
|
|
}
|
|
|
|
SetEventFileDescriptor(tcp->event, tcp->sockfd);
|
|
|
|
tcp_get_ip_address(tcp);
|
|
tcp_get_mac_address(tcp);
|
|
|
|
option_value = 1;
|
|
option_len = sizeof(option_value);
|
|
|
|
if (setsockopt(tcp->sockfd, IPPROTO_TCP, TCP_NODELAY, (void*) &option_value, option_len) < 0)
|
|
fprintf(stderr, "%s: unable to set TCP_NODELAY\n", __FUNCTION__);
|
|
|
|
/* receive buffer must be a least 32 K */
|
|
if (getsockopt(tcp->sockfd, SOL_SOCKET, SO_RCVBUF, (void*) &option_value, &option_len) == 0)
|
|
{
|
|
if (option_value < (1024 * 32))
|
|
{
|
|
option_value = 1024 * 32;
|
|
option_len = sizeof(option_value);
|
|
|
|
if (setsockopt(tcp->sockfd, SOL_SOCKET, SO_RCVBUF, (void*) &option_value, option_len) < 0)
|
|
{
|
|
fprintf(stderr, "%s: unable to set receive buffer len\n", __FUNCTION__);
|
|
return FALSE;
|
|
}
|
|
}
|
|
}
|
|
|
|
if (!tcp_set_keep_alive_mode(tcp))
|
|
return FALSE;
|
|
|
|
tcp->bufferedBio = BIO_new(BIO_s_buffered_socket());
|
|
|
|
if (!tcp->bufferedBio)
|
|
return FALSE;
|
|
|
|
tcp->bufferedBio->ptr = tcp;
|
|
|
|
tcp->bufferedBio = BIO_push(tcp->bufferedBio, tcp->socketBio);
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
BOOL tcp_disconnect(rdpTcp* tcp)
|
|
{
|
|
freerdp_tcp_disconnect(tcp->sockfd);
|
|
tcp->sockfd = -1;
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
BOOL tcp_set_blocking_mode(rdpTcp* tcp, BOOL blocking)
|
|
{
|
|
#ifndef _WIN32
|
|
int flags;
|
|
flags = fcntl(tcp->sockfd, F_GETFL);
|
|
|
|
if (flags == -1)
|
|
{
|
|
fprintf(stderr, "%s: fcntl failed, %s.\n", __FUNCTION__, strerror(errno));
|
|
return FALSE;
|
|
}
|
|
|
|
if (blocking == TRUE)
|
|
fcntl(tcp->sockfd, F_SETFL, flags & ~(O_NONBLOCK));
|
|
else
|
|
fcntl(tcp->sockfd, F_SETFL, flags | O_NONBLOCK);
|
|
#else
|
|
int status;
|
|
u_long arg = blocking;
|
|
|
|
status = ioctlsocket(tcp->sockfd, FIONBIO, &arg);
|
|
|
|
if (status != NO_ERROR)
|
|
fprintf(stderr, "ioctlsocket() failed with error: %ld\n", status);
|
|
|
|
tcp->wsa_event = WSACreateEvent();
|
|
WSAEventSelect(tcp->sockfd, tcp->wsa_event, FD_READ);
|
|
#endif
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
BOOL tcp_set_keep_alive_mode(rdpTcp* tcp)
|
|
{
|
|
#ifndef _WIN32
|
|
UINT32 option_value;
|
|
socklen_t option_len;
|
|
|
|
option_value = 1;
|
|
option_len = sizeof(option_value);
|
|
|
|
if (setsockopt(tcp->sockfd, SOL_SOCKET, SO_KEEPALIVE, (void*) &option_value, option_len) < 0)
|
|
{
|
|
perror("setsockopt() SOL_SOCKET, SO_KEEPALIVE:");
|
|
return FALSE;
|
|
}
|
|
|
|
#ifdef TCP_KEEPIDLE
|
|
option_value = 5;
|
|
option_len = sizeof(option_value);
|
|
|
|
if (setsockopt(tcp->sockfd, IPPROTO_TCP, TCP_KEEPIDLE, (void*) &option_value, option_len) < 0)
|
|
{
|
|
perror("setsockopt() IPPROTO_TCP, TCP_KEEPIDLE:");
|
|
return FALSE;
|
|
}
|
|
#endif
|
|
|
|
#ifdef TCP_KEEPCNT
|
|
option_value = 3;
|
|
option_len = sizeof(option_value);
|
|
|
|
if (setsockopt(tcp->sockfd, SOL_TCP, TCP_KEEPCNT, (void *) &option_value, option_len) < 0)
|
|
{
|
|
perror("setsockopt() SOL_TCP, TCP_KEEPCNT:");
|
|
return FALSE;
|
|
}
|
|
#endif
|
|
|
|
#ifdef TCP_KEEPINTVL
|
|
option_value = 2;
|
|
option_len = sizeof(option_value);
|
|
|
|
if (setsockopt(tcp->sockfd, SOL_TCP, TCP_KEEPINTVL, (void *) &option_value, option_len) < 0)
|
|
{
|
|
perror("setsockopt() SOL_TCP, TCP_KEEPINTVL:");
|
|
return FALSE;
|
|
}
|
|
#endif
|
|
#endif
|
|
|
|
#ifdef __MACOSX__
|
|
option_value = 1;
|
|
option_len = sizeof(option_value);
|
|
if (setsockopt(tcp->sockfd, SOL_SOCKET, SO_NOSIGPIPE, (void *) &option_value, option_len) < 0)
|
|
{
|
|
perror("setsockopt() SOL_SOCKET, SO_NOSIGPIPE:");
|
|
}
|
|
#endif
|
|
return TRUE;
|
|
}
|
|
|
|
int tcp_attach(rdpTcp* tcp, int sockfd)
|
|
{
|
|
tcp->sockfd = sockfd;
|
|
SetEventFileDescriptor(tcp->event, tcp->sockfd);
|
|
|
|
ringbuffer_commit_read_bytes(&tcp->xmitBuffer, ringbuffer_used(&tcp->xmitBuffer));
|
|
|
|
if (tcp->socketBio)
|
|
{
|
|
if (BIO_set_fd(tcp->socketBio, sockfd, 1) < 0)
|
|
return -1;
|
|
}
|
|
else
|
|
{
|
|
tcp->socketBio = BIO_new(BIO_s_simple_socket());
|
|
|
|
if (!tcp->socketBio)
|
|
return -1;
|
|
|
|
BIO_set_fd(tcp->socketBio, sockfd, BIO_CLOSE);
|
|
}
|
|
|
|
if (!tcp->bufferedBio)
|
|
{
|
|
tcp->bufferedBio = BIO_new(BIO_s_buffered_socket());
|
|
|
|
if (!tcp->bufferedBio)
|
|
return FALSE;
|
|
|
|
tcp->bufferedBio->ptr = tcp;
|
|
|
|
tcp->bufferedBio = BIO_push(tcp->bufferedBio, tcp->socketBio);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
HANDLE tcp_get_event_handle(rdpTcp* tcp)
|
|
{
|
|
if (!tcp)
|
|
return NULL;
|
|
|
|
#ifndef _WIN32
|
|
return tcp->event;
|
|
#else
|
|
return (HANDLE) tcp->wsa_event;
|
|
#endif
|
|
}
|
|
|
|
rdpTcp* tcp_new(rdpSettings* settings)
|
|
{
|
|
rdpTcp* tcp;
|
|
|
|
tcp = (rdpTcp*) calloc(1, sizeof(rdpTcp));
|
|
|
|
if (!tcp)
|
|
return NULL;
|
|
|
|
if (!ringbuffer_init(&tcp->xmitBuffer, 0x10000))
|
|
goto out_free;
|
|
|
|
tcp->sockfd = -1;
|
|
tcp->settings = settings;
|
|
|
|
if (0)
|
|
goto out_ringbuffer; /* avoid unreferenced label warning on Windows */
|
|
|
|
#ifndef _WIN32
|
|
tcp->event = CreateFileDescriptorEvent(NULL, FALSE, FALSE, tcp->sockfd);
|
|
|
|
if (!tcp->event || tcp->event == INVALID_HANDLE_VALUE)
|
|
goto out_ringbuffer;
|
|
#endif
|
|
|
|
return tcp;
|
|
out_ringbuffer:
|
|
ringbuffer_destroy(&tcp->xmitBuffer);
|
|
out_free:
|
|
free(tcp);
|
|
return NULL;
|
|
}
|
|
|
|
void tcp_free(rdpTcp* tcp)
|
|
{
|
|
if (!tcp)
|
|
return;
|
|
|
|
ringbuffer_destroy(&tcp->xmitBuffer);
|
|
CloseHandle(tcp->event);
|
|
free(tcp);
|
|
}
|