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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
//
#ifndef OPENVPN_HTTP_URLPARSE_H
#define OPENVPN_HTTP_URLPARSE_H
#include <string>
#include <openvpn/common/platform.hpp>
#include <openvpn/common/exception.hpp>
#include <openvpn/common/string.hpp>
#include <openvpn/common/hostport.hpp>
#include <openvpn/common/format.hpp>
#include <openvpn/http/validate_uri.hpp>
#include <openvpn/http/parseutil.hpp>
namespace openvpn::URL {
OPENVPN_EXCEPTION(url_parse_error);
class Parse
{
public:
Parse()
{
}
Parse(const std::string &url,
const bool set_default_port = false,
const bool loose_validation = false)
{
enum State
{
Scheme,
PostSchemeSlash1,
PostSchemeSlash2,
StartHost,
Host,
BracketedHost,
PostBracketedHost,
Port,
URI,
};
State state = Scheme;
for (auto &c : url)
{
reprocess:
switch (state)
{
case Scheme:
if (c == ':')
state = PostSchemeSlash1;
else if (is_valid_scheme_char(c))
scheme += c;
else
throw url_parse_error("bad scheme char");
break;
case PostSchemeSlash1:
if (c == '/')
state = PostSchemeSlash2;
else
throw url_parse_error("expected '://' after scheme");
break;
case PostSchemeSlash2:
if (c == '/')
state = StartHost;
else
throw url_parse_error("expected '://' after scheme");
break;
case StartHost:
if (c == '[')
state = BracketedHost;
else
{
state = Host;
goto reprocess;
}
break;
case Host:
if (c == ':')
state = Port;
else if (c == '/')
{
state = URI;
goto reprocess;
}
else
host += c;
break;
case BracketedHost:
if (c == ']')
state = PostBracketedHost;
else
host += c;
break;
case PostBracketedHost:
if (c == ':')
{
state = Port;
break;
}
else
{
state = URI;
goto reprocess;
}
break;
case Port:
if (c == '/')
{
state = URI;
goto reprocess;
}
else
port += c;
break;
case URI:
if (!HTTP::is_valid_uri_char(c) && !loose_validation)
throw url_parse_error("bad URI char");
uri += c;
break;
}
}
if (set_default_port)
default_port();
if (uri.empty())
uri = "/";
validate();
}
// Note that special address types such as unix domain
// sockets or windows named pipes store a tag such as
// "unix" or "np" as the port component of an address/port
// tuple. Here, we move such tags into the scheme.
static Parse from_components(const bool https,
const std::string &host,
const std::string &port,
const std::string &uri)
{
Parse p;
p.scheme = https ? "https" : "http";
p.host = host;
if (port.size() >= 1 && !string::is_digit(port[0])) // non-INET address
p.scheme = port;
else
p.port = port;
p.uri = uri;
return p;
}
void validate() const
{
if (scheme.empty())
throw url_parse_error("undefined scheme");
if (host.empty())
throw url_parse_error("undefined host");
if (uri.empty())
throw url_parse_error("undefined uri");
if (!port.empty() && !HostPort::is_valid_port(port))
throw url_parse_error("bad port");
if ((scheme == "http" || scheme == "https") && !HostPort::is_valid_host(host))
throw url_parse_error("bad host");
}
void default_port()
{
if (port.empty())
{
if (scheme == "http")
port = "80";
else if (scheme == "https")
port = "443";
}
}
bool port_implied() const
{
return (scheme == "http" && port == "80") || (scheme == "https" && port == "443");
}
bool is_bracketed_host() const
{
return host.find_first_of(":/\\") != std::string::npos;
}
std::string bracketed_host() const
{
return '[' + host + ']';
}
std::string to_string() const
{
const bool bracket_host = is_bracketed_host();
std::string ret;
ret.reserve(256);
ret += scheme;
ret += "://";
if (bracket_host)
ret += '[';
ret += host;
if (bracket_host)
ret += ']';
if (!port.empty() && !port_implied())
{
ret += ':';
ret += port;
}
ret += uri;
return ret;
}
std::string format_components() const
{
return printfmt("[scheme=%r host=%r port=%r uri=%r]", scheme, host, port, uri);
}
// Note that special address types such as unix domain
// sockets or windows named pipes store a tag such as
// "unix" or "np" as the port component of an address/port
// tuple. This method returns the port number for INET
// addresses or a special tag for non-INET addresses.
// Internally, we store the tag as an alternative
// scheme such as "unix" or "np".
std::string port_for_scheme() const
{
#ifdef OPENVPN_PLATFORM_WIN
if (scheme == "np") // named pipe
return scheme;
#else
if (scheme == "unix") // unix domain socket
return scheme;
#endif
if (scheme == "http" || scheme == "https")
return port;
throw url_parse_error("unknown scheme");
}
std::string scheme;
std::string host;
std::string port;
std::string uri;
private:
bool is_valid_scheme_char(const char c)
{
return (c >= 'a' && c <= 'z') || c == '_';
}
};
} // namespace openvpn::URL
#endif
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