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net/interfaces: ignore bogus proxy URLs from winhttp [windows]

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Updates tailscale/corp#853

(cherry picked from commit d192bd0f860e6beacc63390b9b21a7b691923d31)
This commit is contained in:
Brad Fitzpatrick 2020-11-10 11:30:05 -08:00
parent 33505097c4
commit bddc882f7d
1 changed files with 7 additions and 1 deletions
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8
net/interfaces/interfaces_windows.go
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@ -7,6 +7,7 @@ package interfaces
import (
"fmt"
"log"
"net/url"
"os/exec"
"syscall"
"unsafe"
@ -176,7 +177,12 @@ func getPACWindows() string {
return ""
}
defer globalFree.Call(uintptr(unsafe.Pointer(res)))
return windows.UTF16PtrToString(res)
s := windows.UTF16PtrToString(res)
if _, err := url.Parse(s); err != nil {
log.Printf("getPACWindows: invalid URL %q from winhttp; ignoring", s)
return ""
}
return s
}
const (
ERROR_WINHTTP_AUTODETECTION_FAILED = 12180