mirror of
https://github.com/klzgrad/naiveproxy.git
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78 lines
2.9 KiB
C++
78 lines
2.9 KiB
C++
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// Copyright 2018 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#include "net/http/proxy_fallback.h"
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#include "net/base/net_errors.h"
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#include "net/base/proxy_server.h"
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namespace net {
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NET_EXPORT bool CanFalloverToNextProxy(const ProxyServer& proxy,
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int error,
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int* final_error) {
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*final_error = error;
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if (proxy.is_quic()) {
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switch (error) {
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case ERR_QUIC_PROTOCOL_ERROR:
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case ERR_QUIC_HANDSHAKE_FAILED:
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case ERR_MSG_TOO_BIG:
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return true;
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}
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}
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// TODO(eroman): Split up these error codes across the relevant proxy types.
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//
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// A failure to resolve the hostname or any error related to establishing a
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// TCP connection could be grounds for trying a new proxy configuration.
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//
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// Why do this when a hostname cannot be resolved? Some URLs only make sense
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// to proxy servers. The hostname in those URLs might fail to resolve if we
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// are still using a non-proxy config. We need to check if a proxy config
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// now exists that corresponds to a proxy server that could load the URL.
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//
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// A failure while establishing a tunnel to the proxy
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// (ERR_TUNNEL_CONNECTION_FAILED) is NOT considered grounds for fallback.
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// Other browsers similarly don't fallback, and some client's PAC
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// configurations rely on this for some degree of content blocking.
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// See https://crbug.com/680837 for details.
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switch (error) {
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case ERR_PROXY_CONNECTION_FAILED:
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case ERR_NAME_NOT_RESOLVED:
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case ERR_INTERNET_DISCONNECTED:
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case ERR_ADDRESS_UNREACHABLE:
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case ERR_CONNECTION_CLOSED:
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case ERR_CONNECTION_TIMED_OUT:
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case ERR_CONNECTION_RESET:
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case ERR_CONNECTION_REFUSED:
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case ERR_CONNECTION_ABORTED:
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case ERR_TIMED_OUT:
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case ERR_SOCKS_CONNECTION_FAILED:
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// ERR_PROXY_CERTIFICATE_INVALID can happen in the case of trying to talk to
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// a proxy using SSL, and ending up talking to a captive portal that
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// supports SSL instead.
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case ERR_PROXY_CERTIFICATE_INVALID:
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// ERR_SSL_PROTOCOL_ERROR can happen when trying to talk SSL to a non-SSL
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// server (like a captive portal).
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case ERR_SSL_PROTOCOL_ERROR:
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return true;
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case ERR_SOCKS_CONNECTION_HOST_UNREACHABLE:
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// Remap the SOCKS-specific "host unreachable" error to a more
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// generic error code (this way consumers like the link doctor
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// know to substitute their error page).
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//
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// Note that if the host resolving was done by the SOCKS5 proxy, we can't
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// differentiate between a proxy-side "host not found" versus a proxy-side
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// "address unreachable" error, and will report both of these failures as
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// ERR_ADDRESS_UNREACHABLE.
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*final_error = ERR_ADDRESS_UNREACHABLE;
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return false;
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}
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return false;
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}
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} // namespace net
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