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feature, net/tshttpproxy: pull out support for using proxies as a feature

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Saves 139 KB.

Also Synology support, which I saw had its own large-ish proxy parsing
support on Linux, but support for proxies without Synology proxy
support is reasonable, so I pulled that out as its own thing.

Updates #12614

Change-Id: I22de285a3def7be77fdcf23e2bec7c83c9655593
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
This commit is contained in:
Brad Fitzpatrick
2025-09-30 09:12:42 -07:00
committed by Brad Fitzpatrick
parent 9b997c8f2f
commit 442a3a779d
45 changed files with 267 additions and 79 deletions
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11
net/netmon/state.go
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@@ -15,10 +15,11 @@ import (
"strings"
"tailscale.com/envknob"
"tailscale.com/feature"
"tailscale.com/feature/buildfeatures"
"tailscale.com/hostinfo"
"tailscale.com/net/netaddr"
"tailscale.com/net/tsaddr"
"tailscale.com/net/tshttpproxy"
"tailscale.com/util/mak"
)
@@ -501,13 +502,15 @@ func getState(optTSInterfaceName string) (*State, error) {
}
}
if s.AnyInterfaceUp() {
if buildfeatures.HasUseProxy && s.AnyInterfaceUp() {
req, err := http.NewRequest("GET", LoginEndpointForProxyDetermination, nil)
if err != nil {
return nil, err
}
if u, err := tshttpproxy.ProxyFromEnvironment(req); err == nil && u != nil {
s.HTTPProxy = u.String()
if proxyFromEnv, ok := feature.HookProxyFromEnvironment.GetOk(); ok {
if u, err := proxyFromEnv(req); err == nil && u != nil {
s.HTTPProxy = u.String()
}
}
if getPAC != nil {
s.PAC = getPAC()