FreeRDP/libfreerdp/core/tcp.c

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/**
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* FreeRDP: A Remote Desktop Protocol Implementation
* Transmission Control Protocol (TCP)
*
* Copyright 2011 Vic Lee
* Copyright 2011 Marc-Andre Moreau <marcandre.moreau@gmail.com>
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <errno.h>
#include <fcntl.h>
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#include <winpr/crt.h>
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#ifndef _WIN32
#include <netdb.h>
#include <unistd.h>
#include <sys/ioctl.h>
#include <sys/socket.h>
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#include <netinet/in.h>
#include <netinet/tcp.h>
#include <net/if.h>
#ifdef __APPLE__
#ifndef TCP_KEEPIDLE
#define TCP_KEEPIDLE TCP_KEEPALIVE
#endif
#endif
#else
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#define SHUT_RDWR SD_BOTH
#define close(_fd) closesocket(_fd)
#endif
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#include <freerdp/utils/tcp.h>
#include <freerdp/utils/uds.h>
#include <winpr/stream.h>
#include "tcp.h"
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void tcp_get_ip_address(rdpTcp* tcp)
{
BYTE* ip;
socklen_t length;
struct sockaddr_in sockaddr;
length = sizeof(sockaddr);
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ZeroMemory(&sockaddr, length);
if (getsockname(tcp->sockfd, (struct sockaddr*) &sockaddr, &length) == 0)
{
ip = (BYTE*) (&sockaddr.sin_addr);
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sprintf_s(tcp->ip_address, sizeof(tcp->ip_address),
"%u.%u.%u.%u", ip[0], ip[1], ip[2], ip[3]);
}
else
{
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strcpy(tcp->ip_address, "127.0.0.1");
}
tcp->settings->IPv6Enabled = 0;
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free(tcp->settings->ClientAddress);
tcp->settings->ClientAddress = _strdup(tcp->ip_address);
}
void tcp_get_mac_address(rdpTcp* tcp)
{
#ifdef LINUX
BYTE* mac;
struct ifreq if_req;
struct if_nameindex* ni;
ni = if_nameindex();
mac = tcp->mac_address;
while (ni->if_name != NULL)
{
if (strcmp(ni->if_name, "lo") != 0)
break;
ni++;
}
strncpy(if_req.ifr_name, ni->if_name, IF_NAMESIZE);
if (ioctl(tcp->sockfd, SIOCGIFHWADDR, &if_req) != 0)
{
fprintf(stderr, "failed to obtain MAC address\n");
return;
}
memmove((void*) mac, (void*) &if_req.ifr_ifru.ifru_hwaddr.sa_data[0], 6);
#endif
/* fprintf(stderr, "MAC: %02X:%02X:%02X:%02X:%02X:%02X\n",
mac[0], mac[1], mac[2], mac[3], mac[4], mac[5]); */
}
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BOOL tcp_connect(rdpTcp* tcp, const char* hostname, int port)
{
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UINT32 option_value;
socklen_t option_len;
if (!hostname)
return FALSE;
if (hostname[0] == '/')
{
tcp->sockfd = freerdp_uds_connect(hostname);
if (tcp->sockfd < 0)
return FALSE;
}
else
{
tcp->sockfd = freerdp_tcp_connect(hostname, port);
if (tcp->sockfd < 0)
return FALSE;
SetEventFileDescriptor(tcp->event, tcp->sockfd);
tcp_get_ip_address(tcp);
tcp_get_mac_address(tcp);
option_value = 1;
option_len = sizeof(option_value);
setsockopt(tcp->sockfd, IPPROTO_TCP, TCP_NODELAY, (void*) &option_value, option_len);
/* 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);
setsockopt(tcp->sockfd, SOL_SOCKET, SO_RCVBUF, (void*) &option_value, option_len);
}
}
tcp_set_keep_alive_mode(tcp);
}
return TRUE;
}
int tcp_read(rdpTcp* tcp, BYTE* data, int length)
{
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return freerdp_tcp_read(tcp->sockfd, data, length);
}
int tcp_write(rdpTcp* tcp, BYTE* data, int length)
{
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return freerdp_tcp_write(tcp->sockfd, data, length);
}
int tcp_wait_read(rdpTcp* tcp)
{
return freerdp_tcp_wait_read(tcp->sockfd);
}
int tcp_wait_write(rdpTcp* tcp)
{
return freerdp_tcp_wait_write(tcp->sockfd);
}
BOOL tcp_disconnect(rdpTcp* tcp)
{
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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, "tcp_set_blocking_mode: fcntl failed.\n");
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
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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, SO_KEEPIDLE:");
return FALSE;
}
#endif
#endif
return TRUE;
}
int tcp_attach(rdpTcp* tcp, int sockfd)
{
tcp->sockfd = sockfd;
SetEventFileDescriptor(tcp->event, tcp->sockfd);
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)
{
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rdpTcp* tcp;
tcp = (rdpTcp*) malloc(sizeof(rdpTcp));
if (tcp)
{
ZeroMemory(tcp, sizeof(rdpTcp));
tcp->sockfd = -1;
tcp->settings = settings;
tcp->event = CreateFileDescriptorEvent(NULL, FALSE, FALSE, tcp->sockfd);
}
return tcp;
}
void tcp_free(rdpTcp* tcp)
{
if (tcp)
{
CloseHandle(tcp->event);
free(tcp);
}
}