11 Commits (f6642e0ece20e59e29a076d500d0edf03122d2d1)

Author	SHA1	Message	Date
Aaron Klotz	6e91f872af	net/tshttpproxy: ensure we pass the correct flags to WinHttpOpen on Win7 and Win8.0 ... The best flag to use on Win7 and Win8.0 is deprecated in Win8.1, so we resolve the flag depending on OS version info. Fixes https://github.com/tailscale/tailscale/issues/4201 Signed-off-by: Aaron Klotz <aaron@tailscale.com>	3 years ago
Josh Bleecher Snyder	ca1b3fe235	net/tshttpproxy: use correct size for Windows BOOL argument ... The Windows BOOL type is an int32. We were using a bool, which is a one byte wide. This could be responsible for the ERROR_INVALID_PARAMETER errors we were seeing for calls to WinHttpGetProxyForUrl. We manually checked all other existing Windows syscalls for similar mistakes and did not find any. Updates #879 Co-authored-by: Aaron Klotz <aaron@tailscale.com> Signed-off-by: Josh Bleecher Snyder <josh@tailscale.com>	3 years ago
Brad Fitzpatrick	10f48087f4	net/tshttpproxy: call winhttp calls from a fixed OS thread ... We often see things in logs like: 2021-03-02 17:52:45.2456258 +0800 +0800: winhttp: Open: The parameter is incorrect. 2021-03-02 17:52:45.2506261 +0800 +0800: tshttpproxy: winhttp: GetProxyForURL("https://log.tailscale.io/c/tailnode.log.tailscale.io/5037bb42f4bc330e2d6143e191a7ff7e837c6be538139231de69a439536e0d68"): ERROR_INVALID_PARAMETER [unexpected] I have a hunch that WinHTTP has thread-local state. If so, this would fix it. If not, this is pretty harmless. Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	4 years ago
Brad Fitzpatrick	1036f51a56	net/tshttpproxy: aggressively rate-limit error logs in Transport.Proxy path ... Otherwise log upload HTTP requests generate proxy errrors which generate logs which generate HTTP requests which generate proxy errors which generate more logs, etc. Fixes #879	4 years ago
Brad Fitzpatrick	5bcac4eaac	net/tshttpproxy: add GetProxyForURL negative cache ... Otherwise when PAC server is down, we log, and each log entry is a new HTTP request (from logtail) and a new GetProxyForURL call, which again logs, non-stop. This is also nicer to the WinHTTP service. Then also hook up link change notifications to the cache to reset it if there's a chance the network might work sooner.	4 years ago
Brad Fitzpatrick	9c25968b63	net/tshttpproxy: fix typo in Windows code added at least second ... I ran tests & vet & staticcheck, but for Linux, not Windows. (#728 would be nice)	4 years ago
Brad Fitzpatrick	b026a638c7	net/tshttpproxy: if winhttp.GetProxyForURL blocks too long, use previous value ... We currently have a chickend-and-egg situation in some environments where we can set up routes that WinHTTP's WPAD/PAC resolution service needs to download the PAC file to evaluate GetProxyForURL, but the PAC file is behind a route for which we need to call GetProxyForURL to e.g. dial a DERP server. As a short-term fix, just assume that the most recently returned proxy is good enough for such situations.	4 years ago
Brad Fitzpatrick	74ee374667	net/tshttpproxy: add more winhttp logging ... Notably around duration of calls.	4 years ago
Brad Fitzpatrick	f915ab6552	net/tshttpproxy: add start of Kerberos Negotiate auth to proxies on Windows ... For now only used by a new cmd/tailscale debug --get-url subcommand. Not yet wired up to the places making HTTP requests. Updates tailscale/corp#583	4 years ago
Brad Fitzpatrick	9be1917c5b	net/tshttpproxy: discard secondary Windows proxies for now	4 years ago
Brad Fitzpatrick	c5eb57f4d6	net/tshttpproxy: new package, support WPAD/PAC proxies on Windows ... Updates tailscale/corp#553 Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	4 years ago