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// OpenVPN -- An application to securely tunnel IP networks
// over a single port, with support for SSL/TLS-based
// session authentication and key exchange,
// packet encryption, packet authentication, and
// packet compression.
//
// Copyright (C) 2012- OpenVPN Inc.
//
// SPDX-License-Identifier: MPL-2.0 OR AGPL-3.0-only WITH openvpn3-openssl-exception
//
// Environmental variables
#ifndef OPENVPN_COMMON_ENVIRON_H
#define OPENVPN_COMMON_ENVIRON_H
#include <string>
#include <cstring>
#include <vector>
#include <utility>
#include <openvpn/common/size.hpp>
extern char **environ;
namespace openvpn {
class Environ : public std::vector<std::string>
{
public:
static std::string find_static(const std::string &name)
{
for (char **e = ::environ; *e != NULL; ++e)
{
const char *eq = ::strchr(*e, '=');
if (eq && eq > *e)
{
const size_t namelen = eq - *e;
if (name.length() == namelen && ::strncmp(name.c_str(), *e, namelen) == 0)
return std::string(eq + 1);
}
}
return "";
}
void load_from_environ()
{
reserve(64);
for (char **e = ::environ; *e != NULL; ++e)
emplace_back(*e);
}
std::string to_string() const
{
std::string ret;
ret.reserve(512);
for (const auto &s : *this)
{
ret += s;
ret += '\n';
}
return ret;
}
int find_index(const std::string &name) const
{
for (size_type i = 0; i < size(); ++i)
{
const std::string &s = (*this)[i];
const size_t pos = s.find_first_of('=');
if (pos != std::string::npos)
{
if (name == s.substr(0, pos))
return static_cast<int>(i); // TODO: [OVPN3-928] Evaluate the safety of casting this down
}
else
{
if (name == s)
return static_cast<int>(i); // Same as above
}
}
return -1;
}
std::string find(const std::string &name) const
{
const int i = find_index(name);
if (i >= 0)
return value(i);
else
return "";
}
std::string value(const size_t idx) const
{
const std::string &s = (*this)[idx];
const size_t pos = s.find_first_of('=');
if (pos != std::string::npos)
return s.substr(pos + 1);
else
return "";
}
void assign(const std::string &name, const std::string &value)
{
std::string nv = name + '=' + value;
const int i = find_index(name);
if (i >= 0)
(*this)[i] = std::move(nv);
else
push_back(std::move(nv));
}
};
} // namespace openvpn
#endif
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