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net/tshttpproxy: fix WDAP/PAC proxy detection on Win10 1607 and earlier

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Using WINHTTP_AUTOPROXY_ALLOW_AUTOCONFIG on Windows versions older than Windows 10 1703 (build 15063)
is not supported and causes WinHttpGetProxyForUrl to fail with ERROR_INVALID_PARAMETER. This results in failures
reaching the control on environments where a proxy is required.

We use wingoes version detection to conditionally set the WINHTTP_AUTOPROXY_ALLOW_AUTOCONFIG flag
on Windows builds greater than 15063.

While there, we also update proxy detection to use WINHTTP_AUTO_DETECT_TYPE_DNS_A, as DNS-based proxy discovery
might be required with Active Directory and in certain other environments.

Updates tailscale/corp#29168
Fixes #879

Signed-off-by: Nick Khyl <nickk@tailscale.com>
This commit is contained in:
Nick Khyl
2025-05-29 10:41:23 -05:00
committed by Nick Khyl
parent 4cccd15eeb
commit 191afd3390
2 changed files with 21 additions and 9 deletions
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2
cmd/derper/depaware.txt
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@@ -12,7 +12,7 @@ tailscale.com/cmd/derper dependencies: (generated by github.com/tailscale/depawa
github.com/coder/websocket/internal/util from github.com/coder/websocket
github.com/coder/websocket/internal/xsync from github.com/coder/websocket
L github.com/coreos/go-iptables/iptables from tailscale.com/util/linuxfw
W 💣 github.com/dblohm7/wingoes from tailscale.com/util/winutil
W 💣 github.com/dblohm7/wingoes from tailscale.com/util/winutil+
github.com/fxamacker/cbor/v2 from tailscale.com/tka
github.com/go-json-experiment/json from tailscale.com/types/opt+
github.com/go-json-experiment/json/internal from github.com/go-json-experiment/json+