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// Copyright 2010 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "net/base/proxy_server.h"
#include <stdint.h>
#include <optional>
#include <ostream>
#include <string>
#include <string_view>
#include "base/check_op.h"
#include "base/numerics/safe_conversions.h"
#include "base/pickle.h"
#include "base/strings/strcat.h"
#include "base/strings/string_number_conversions.h"
#include "base/strings/string_util.h"
#include "net/base/proxy_string_util.h"
#include "url/third_party/mozilla/url_parse.h"
#include "url/url_canon.h"
#include "url/url_canon_stdstring.h"
namespace net {
namespace {
bool IsValidSchemeInt(int scheme_int) {
switch (scheme_int) {
case ProxyServer::SCHEME_INVALID:
case ProxyServer::SCHEME_HTTP:
case ProxyServer::SCHEME_SOCKS4:
case ProxyServer::SCHEME_SOCKS5:
case ProxyServer::SCHEME_HTTPS:
case ProxyServer::SCHEME_QUIC:
return true;
default:
return false;
}
}
} // namespace
ProxyServer::ProxyServer(Scheme scheme, const HostPortPair& host_port_pair)
: scheme_(scheme), host_port_pair_(host_port_pair) {
if (scheme_ == SCHEME_INVALID) {
// |host_port_pair| isn't relevant for these special schemes, so none should
// have been specified. It is important for this to be consistent since we
// do raw field comparisons in the equality and comparison functions.
DCHECK_EQ(host_port_pair, HostPortPair());
host_port_pair_ = HostPortPair();
}
}
// static
ProxyServer ProxyServer::FromSchemeHostAndPort(Scheme scheme,
std::string_view host,
std::string_view port_str) {
// Create INVALID proxies directly using `ProxyServer()`.
DCHECK_NE(scheme, SCHEME_INVALID);
int port_number =
url::ParsePort(port_str.data(), url::Component(0, port_str.size()));
if (port_number == url::PORT_UNSPECIFIED)
return FromSchemeHostAndPort(scheme, host, std::nullopt);
if (port_number == url::PORT_INVALID)
return ProxyServer();
DCHECK(base::IsValueInRangeForNumericType<uint16_t>(port_number));
return FromSchemeHostAndPort(scheme, host,
static_cast<uint16_t>(port_number));
}
// static
ProxyServer ProxyServer::FromSchemeHostAndPort(Scheme scheme,
std::string_view host,
std::optional<uint16_t> port) {
// Create INVALID proxies directly using `ProxyServer()`.
DCHECK_NE(scheme, SCHEME_INVALID);
// Trim host which may have been pasted with excess whitespace.
if (!host.empty()) {
host = base::TrimWhitespaceASCII(host, base::TRIM_ALL);
}
// Add brackets to IPv6 literals if missing, as required by url
// canonicalization.
std::string bracketed_host;
if (!host.empty() && host.front() != '[' &&
host.find(":") != std::string_view::npos) {
bracketed_host = base::StrCat({"[", host, "]"});
host = bracketed_host;
}
std::string canonicalized_host;
url::StdStringCanonOutput canonicalized_output(&canonicalized_host);
url::Component component_output;
if (!url::CanonicalizeHost(host.data(), url::Component(0, host.size()),
&canonicalized_output, &component_output)) {
return ProxyServer();
}
if (component_output.is_empty())
return ProxyServer();
canonicalized_output.Complete();
// Remove IPv6 literal bracketing, as required by HostPortPair.
std::string_view unbracketed_host = canonicalized_host;
if (canonicalized_host.front() == '[' && canonicalized_host.back() == ']')
unbracketed_host = unbracketed_host.substr(1, unbracketed_host.size() - 2);
// A uint16_t port is always valid and canonicalized.
uint16_t fixed_port = port.value_or(GetDefaultPortForScheme(scheme));
return ProxyServer(scheme, HostPortPair(unbracketed_host, fixed_port));
}
// static
ProxyServer ProxyServer::CreateFromPickle(base::PickleIterator* pickle_iter) {
Scheme scheme = SCHEME_INVALID;
int scheme_int;
if (pickle_iter->ReadInt(&scheme_int) && IsValidSchemeInt(scheme_int)) {
scheme = static_cast<Scheme>(scheme_int);
}
HostPortPair host_port_pair;
std::string host_port_pair_string;
if (pickle_iter->ReadString(&host_port_pair_string)) {
host_port_pair = HostPortPair::FromString(host_port_pair_string);
}
return ProxyServer(scheme, host_port_pair);
}
void ProxyServer::Persist(base::Pickle* pickle) const {
pickle->WriteInt(static_cast<int>(scheme_));
pickle->WriteString(host_port_pair_.ToString());
}
std::string ProxyServer::GetHost() const {
return host_port_pair().HostForURL();
}
uint16_t ProxyServer::GetPort() const {
return host_port_pair().port();
}
const HostPortPair& ProxyServer::host_port_pair() const {
// Doesn't make sense to call this if the URI scheme doesn't
// have concept of a host.
DCHECK(is_valid());
return host_port_pair_;
}
// static
int ProxyServer::GetDefaultPortForScheme(Scheme scheme) {
switch (scheme) {
case SCHEME_HTTP:
return 80;
case SCHEME_SOCKS4:
case SCHEME_SOCKS5:
return 1080;
case SCHEME_HTTPS:
case SCHEME_QUIC:
return 443;
case SCHEME_INVALID:
break;
}
return -1;
}
std::ostream& operator<<(std::ostream& os, const ProxyServer& proxy_server) {
return os << ProxyServerToPacResultElement(proxy_server);
}
} // namespace net
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