mirror of
https://github.com/OpenVPN/openvpn3.git
synced 2024-09-20 12:12:15 +02:00
109 lines
2.6 KiB
C++
109 lines
2.6 KiB
C++
// Private Gateway
|
|
// Copyright (C) 2012-2017 OpenVPN Technologies, Inc.
|
|
// All rights reserved
|
|
|
|
#ifndef OPENVPN_LINUX_PROCFS_H
|
|
#define OPENVPN_LINUX_PROCFS_H
|
|
|
|
#include <string>
|
|
|
|
#include <openvpn/common/exception.hpp>
|
|
#include <openvpn/common/file.hpp>
|
|
#include <openvpn/common/sleep.hpp>
|
|
#include <openvpn/common/stat.hpp>
|
|
#include <openvpn/common/format.hpp>
|
|
#include <openvpn/common/action.hpp>
|
|
#include <openvpn/common/stop.hpp>
|
|
|
|
namespace openvpn {
|
|
|
|
class ProcFS : public Action
|
|
{
|
|
public:
|
|
OPENVPN_EXCEPTION(procfs_error);
|
|
|
|
ProcFS(std::string fn_arg, std::string text_arg)
|
|
: fn(std::move(fn_arg)),
|
|
text(std::move(text_arg))
|
|
{
|
|
}
|
|
|
|
virtual void execute(std::ostream& os) override
|
|
{
|
|
os << to_string() << std::endl;
|
|
try {
|
|
write_sys(fn, text);
|
|
}
|
|
catch (const std::exception& e)
|
|
{
|
|
os << "ProcFS exception: " << e.what() << std::endl;
|
|
}
|
|
}
|
|
|
|
virtual std::string to_string() const override
|
|
{
|
|
return to_string(fn, text);
|
|
}
|
|
|
|
static std::string to_string(const std::string& fn, const std::string& text)
|
|
{
|
|
return "ProcFS: " + fn + " -> " + string::trim_crlf_copy(text);
|
|
}
|
|
|
|
static void write_sys(const std::string& fn, const std::string& text, Stop* async_stop=nullptr)
|
|
{
|
|
//OPENVPN_LOG(to_string(fn, text));
|
|
|
|
const unsigned int n_retries = 200;
|
|
const unsigned int milliseconds_per_retry = 100;
|
|
volatile bool stop = false;
|
|
|
|
// allow asynchronous stop
|
|
Stop::Scope stop_scope(async_stop, [&stop]() {
|
|
stop = true;
|
|
});
|
|
|
|
for (unsigned int i = 0; i < n_retries && !stop; ++i)
|
|
{
|
|
if (file_exists(fn))
|
|
{
|
|
write_string(fn, text);
|
|
return;
|
|
}
|
|
sleep_milliseconds(milliseconds_per_retry);
|
|
}
|
|
if (stop)
|
|
OPENVPN_THROW(procfs_error, "file " << fn << " : aborting write attempt due to stop signal");
|
|
else
|
|
OPENVPN_THROW(procfs_error, "file " << fn << " failed to exist within " << (n_retries * milliseconds_per_retry / 1000) << " seconds");
|
|
}
|
|
|
|
private:
|
|
std::string fn;
|
|
std::string text;
|
|
};
|
|
|
|
class IPv4ReversePathFilter : public ProcFS
|
|
{
|
|
public:
|
|
IPv4ReversePathFilter(const std::string& dev, const unsigned int value)
|
|
: ProcFS(key_fn(dev), openvpn::to_string(value))
|
|
{
|
|
OPENVPN_LOG("IPv4ReversePathFilter " << dev << " -> " << value);
|
|
}
|
|
|
|
static void write(const std::string& dev, const unsigned int value, Stop* stop=nullptr)
|
|
{
|
|
ProcFS::write_sys(key_fn(dev), openvpn::to_string(value), stop);
|
|
}
|
|
|
|
private:
|
|
static std::string key_fn(const std::string& dev)
|
|
{
|
|
return printfmt("/proc/sys/net/ipv4/conf/%s/rp_filter", dev);
|
|
}
|
|
};
|
|
}
|
|
|
|
#endif
|