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/**
* FreeRDP: A Remote Desktop Protocol client.
* RDP Server Listener
*
* Copyright 2011 Vic Lee
*
* 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.
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <fcntl.h>
#include <freerdp/utils/print.h>
#ifndef _WIN32
#include <netdb.h>
#include <unistd.h>
#include <sys/ioctl.h>
#include <sys/socket.h>
#include <arpa/inet.h>
#include <netinet/in.h>
#include <net/if.h>
#else
#define close(_fd) closesocket(_fd)
#endif
#include "listener.h"
static tbool freerdp_listener_open(freerdp_listener* instance, const char* bind_address, uint16 port)
{
rdpListener* listener = (rdpListener*)instance->listener;
int status;
int sockfd;
char servname[10];
struct addrinfo hints = { 0 };
struct addrinfo* res;
struct addrinfo* ai;
int option_value;
void* sin_addr;
char buf[50];
#ifdef _WIN32
u_long arg;
#endif
hints.ai_family = AF_UNSPEC;
hints.ai_socktype = SOCK_STREAM;
if (bind_address == NULL)
hints.ai_flags = AI_PASSIVE;
snprintf(servname, sizeof(servname), "%d", port);
status = getaddrinfo(bind_address, servname, &hints, &res);
if (status != 0)
{
perror("getaddrinfo");
return false;
}
for (ai = res; ai && listener->num_sockfds < 5; ai = ai->ai_next)
{
if (ai->ai_family != AF_INET && ai->ai_family != AF_INET6)
continue;
sockfd = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);
if (sockfd == -1)
{
perror("socket");
continue;
}
option_value = 1;
if (setsockopt(sockfd, SOL_SOCKET, SO_REUSEADDR, (void*) &option_value, sizeof(option_value)) == -1)
perror("setsockopt");
#ifndef _WIN32
fcntl(sockfd, F_SETFL, O_NONBLOCK);
#else
arg = 1;
ioctlsocket(sockfd, FIONBIO, &arg);
#endif
status = bind(sockfd, ai->ai_addr, ai->ai_addrlen);
if (status != 0)
{
perror("bind");
close(sockfd);
continue;
}
status = listen(sockfd, 10);
if (status != 0)
{
perror("listen");
close(sockfd);
continue;
}
listener->sockfds[listener->num_sockfds++] = sockfd;
if (ai->ai_family == AF_INET)
sin_addr = &(((struct sockaddr_in*)ai->ai_addr)->sin_addr);
else
sin_addr = &(((struct sockaddr_in6*)ai->ai_addr)->sin6_addr);
printf("Listening on %s port %s.\n", inet_ntop(ai->ai_family, sin_addr, buf, sizeof(buf)), servname);
}
freeaddrinfo(res);
return (listener->num_sockfds > 0 ? true : false);
}
static void freerdp_listener_close(freerdp_listener* instance)
{
int i;
rdpListener* listener = (rdpListener*)instance->listener;
for (i = 0; i < listener->num_sockfds; i++)
{
close(listener->sockfds[i]);
}
listener->num_sockfds = 0;
}
static tbool freerdp_listener_get_fds(freerdp_listener* instance, void** rfds, int* rcount)
{
rdpListener* listener = (rdpListener*)instance->listener;
int i;
if (listener->num_sockfds < 1)
return false;
for (i = 0; i < listener->num_sockfds; i++)
{
rfds[*rcount] = (void*)(long)(listener->sockfds[i]);
(*rcount)++;
}
return true;
}
static tbool freerdp_listener_check_fds(freerdp_listener* instance)
{
rdpListener* listener = (rdpListener*)instance->listener;
struct sockaddr_storage peer_addr;
socklen_t peer_addr_size;
int peer_sockfd;
int i;
freerdp_peer* client;
void* sin_addr;
if (listener->num_sockfds < 1)
return false;
for (i = 0; i < listener->num_sockfds; i++)
{
peer_addr_size = sizeof(peer_addr);
peer_sockfd = accept(listener->sockfds[i], (struct sockaddr *)&peer_addr, &peer_addr_size);
if (peer_sockfd == -1)
{
#ifdef _WIN32
int wsa_error = WSAGetLastError();
/* No data available */
if (wsa_error == WSAEWOULDBLOCK)
continue;
#else
if (errno == EAGAIN || errno == EWOULDBLOCK)
continue;
#endif
perror("accept");
return false;
}
client = freerdp_peer_new(peer_sockfd);
if (peer_addr.ss_family == AF_INET)
sin_addr = &(((struct sockaddr_in*)&peer_addr)->sin_addr);
else
sin_addr = &(((struct sockaddr_in6*)&peer_addr)->sin6_addr);
inet_ntop(peer_addr.ss_family, sin_addr, client->hostname, sizeof(client->hostname));
IFCALL(instance->PeerAccepted, instance, client);
}
return true;
}
freerdp_listener* freerdp_listener_new(void)
{
freerdp_listener* instance;
rdpListener* listener;
instance = xnew(freerdp_listener);
instance->Open = freerdp_listener_open;
instance->GetFileDescriptor = freerdp_listener_get_fds;
instance->CheckFileDescriptor = freerdp_listener_check_fds;
instance->Close = freerdp_listener_close;
listener = xnew(rdpListener);
listener->instance = instance;
instance->listener = (void*)listener;
return instance;
}
void freerdp_listener_free(freerdp_listener* instance)
{
rdpListener* listener;
listener = (rdpListener*)instance->listener;
xfree(listener);
xfree(instance);
}
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