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/*
* libjingle
* Copyright 2004--2005, Google Inc.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
* EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <cassert>
#include <algorithm>
#ifdef OSX
#include <errno.h>
#endif
#include "talk/base/firewallsocketserver.h"
#include "talk/base/asyncsocket.h"
#include "talk/base/logging.h"
namespace talk_base {
class FirewallSocket : public AsyncSocketAdapter {
public:
FirewallSocket(FirewallSocketServer * server, AsyncSocket * socket, int type)
: AsyncSocketAdapter(socket), server_(server), type_(type) {
}
FirewallSocket(FirewallSocketServer * server, Socket * socket, int type)
: AsyncSocketAdapter(socket), server_(server), type_(type) {
}
virtual int Connect(const SocketAddress& addr) {
if (type_ == SOCK_STREAM) {
if (!server_->Check(FP_TCP, FD_OUT, addr)) {
//LOG(INFO) << "FirewallSocket::Connect - Outbound TCP connection denied";
// Note: handle this asynchronously?
SetError(EHOSTUNREACH);
return SOCKET_ERROR;
}
}
return AsyncSocketAdapter::Connect(addr);
}
virtual int Send(const void * pv, size_t cb) {
if (type_ == SOCK_DGRAM) {
if (!server_->Check(FP_UDP, FD_OUT, GetRemoteAddress())) {
//LOG(INFO) << "FirewallSocket::Send - Outbound UDP packet dropped";
return static_cast<int>(cb);
}
}
return AsyncSocketAdapter::Send(pv, cb);
}
virtual int SendTo(const void * pv, size_t cb, const SocketAddress& addr) {
if (type_ == SOCK_DGRAM) {
if (!server_->Check(FP_UDP, FD_OUT, addr)) {
//LOG(INFO) << "FirewallSocket::SendTo - Outbound UDP packet dropped";
return static_cast<int>(cb);
}
}
return AsyncSocketAdapter::SendTo(pv, cb, addr);
}
virtual int Recv(void * pv, size_t cb) {
if (type_ == SOCK_DGRAM) {
if (!server_->Check(FP_UDP, FD_IN, GetRemoteAddress())) {
while (true) {
int res = AsyncSocketAdapter::Recv(pv, cb);
if (res <= 0)
return res;
//LOG(INFO) << "FirewallSocket::Recv - Inbound UDP packet dropped";
}
}
}
return AsyncSocketAdapter::Recv(pv, cb);
}
virtual int RecvFrom(void * pv, size_t cb, SocketAddress * paddr) {
if (type_ == SOCK_DGRAM) {
while (true) {
int res = AsyncSocketAdapter::RecvFrom(pv, cb, paddr);
if (res <= 0)
return res;
if (server_->Check(FP_UDP, FD_IN, *paddr))
return res;
//LOG(INFO) << "FirewallSocket::RecvFrom - Inbound UDP packet dropped";
}
}
return AsyncSocketAdapter::RecvFrom(pv, cb, paddr);
}
virtual Socket * Accept(SocketAddress *paddr) {
while (Socket * sock = AsyncSocketAdapter::Accept(paddr)) {
if (server_->Check(FP_TCP, FD_IN, *paddr))
return sock;
sock->Close();
delete sock;
//LOG(INFO) << "FirewallSocket::Accept - Inbound TCP connection denied";
}
return 0;
}
private:
FirewallSocketServer * server_;
int type_;
};
FirewallSocketServer::FirewallSocketServer(SocketServer * server, FirewallManager * manager) : server_(server), manager_(manager) {
if (manager_)
manager_->AddServer(this);
}
FirewallSocketServer::~FirewallSocketServer() {
if (manager_)
manager_->RemoveServer(this);
}
void FirewallSocketServer::AddRule(bool allow, FirewallProtocol p, FirewallDirection d, const SocketAddress& addr) {
Rule r;
r.allow = allow;
r.p = p;
r.d = d;
r.addr = addr;
CritScope scope(&crit_);
rules_.push_back(r);
}
void FirewallSocketServer::ClearRules() {
CritScope scope(&crit_);
rules_.clear();
}
bool FirewallSocketServer::Check(FirewallProtocol p, FirewallDirection d, const SocketAddress& addr) {
CritScope scope(&crit_);
for (size_t i=0; i<rules_.size(); ++i) {
const Rule& r = rules_[i];
if ((r.p != p) && (r.p != FP_ANY))
continue;
if ((r.d != d) && (r.d != FD_ANY))
continue;
if ((r.addr.ip() != addr.ip()) && !r.addr.IsAny())
continue;
if ((r.addr.port() != addr.port()) && (r.addr.port() != 0))
continue;
return r.allow;
}
return true;
}
Socket* FirewallSocketServer::CreateSocket(int type) {
return WrapSocket(server_->CreateSocket(type), type);
}
AsyncSocket* FirewallSocketServer::CreateAsyncSocket(int type) {
return WrapSocket(server_->CreateAsyncSocket(type), type);
}
Socket * FirewallSocketServer::WrapSocket(Socket * sock, int type) {
if (!sock)
return NULL;
return new FirewallSocket(this, sock, type);
}
AsyncSocket * FirewallSocketServer::WrapSocket(AsyncSocket * sock, int type) {
if (!sock)
return NULL;
return new FirewallSocket(this, sock, type);
}
FirewallManager::FirewallManager() {
}
FirewallManager::~FirewallManager() {
assert(servers_.empty());
}
void FirewallManager::AddServer(FirewallSocketServer * server) {
CritScope scope(&crit_);
servers_.push_back(server);
}
void FirewallManager::RemoveServer(FirewallSocketServer * server) {
CritScope scope(&crit_);
servers_.erase(std::remove(servers_.begin(), servers_.end(), server), servers_.end());
}
void FirewallManager::AddRule(bool allow, FirewallProtocol p, FirewallDirection d, const SocketAddress& addr) {
CritScope scope(&crit_);
for (std::vector<FirewallSocketServer *>::const_iterator it = servers_.begin(); it != servers_.end(); ++it) {
(*it)->AddRule(allow, p, d, addr);
}
}
void FirewallManager::ClearRules() {
CritScope scope(&crit_);
for (std::vector<FirewallSocketServer *>::const_iterator it = servers_.begin(); it != servers_.end(); ++it) {
(*it)->ClearRules();
}
}
} // namespace talk_base
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