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net: improve GODEBUG=netdns=1 debug messages 

Fixes #69680

Change-Id: I73b0506c7a3245ba282cffabe47543f5fce86692
GitHub-Last-Rev: 4c6a1a4c70
GitHub-Pull-Request: golang/go#69684
Reviewed-on: https://go-review.googlesource.com/c/go/+/616263
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Ian Lance Taylor <iant@google.com>
Reviewed-by: Michael Knyszek <mknyszek@google.com>
Auto-Submit: Ian Lance Taylor <iant@google.com>
This commit is contained in:
Mateusz Poliwczak 2024-09-27 19:57:12 +00:00 committed by Gopher Robot
parent 0fb33863b7
commit 6536c207c2
1 changed files with 20 additions and 9 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

31
src/net/conf.go
View File

@ -93,20 +93,31 @@ func initConfVal() {
if confVal.dnsDebugLevel > 1 {
println("go package net: confVal.netCgo =", confVal.netCgo, " netGo =", confVal.netGo)
}
switch {
case confVal.netGo:
if netGoBuildTag {
println("go package net: built with netgo build tag; using Go's DNS resolver")
} else {
println("go package net: GODEBUG setting forcing use of Go's resolver")
if dnsMode != "go" && dnsMode != "cgo" && dnsMode != "" {
println("go package net: GODEBUG=netdns contains an invalid dns mode, ignoring it")
}
switch {
case netGoBuildTag || !cgoAvailable:
if dnsMode == "cgo" {
println("go package net: ignoring GODEBUG=netdns=cgo as the binary was compiled without support for the cgo resolver")
} else {
println("go package net: using the Go DNS resolver")
}
case netCgoBuildTag:
if dnsMode == "go" {
println("go package net: GODEBUG setting forcing use of the Go resolver")
} else {
println("go package net: using the cgo DNS resolver")
}
case !cgoAvailable:
println("go package net: cgo resolver not supported; using Go's DNS resolver")
case confVal.netCgo || confVal.preferCgo:
println("go package net: using cgo DNS resolver")
default:
if dnsMode == "go" {
println("go package net: GODEBUG setting forcing use of the Go resolver")
} else if dnsMode == "cgo" {
println("go package net: GODEBUG setting forcing use of the cgo resolver")
} else {
println("go package net: dynamic selection of DNS resolver")
}
}
}()
}