From: Mateusz Poliwczak <mpoliwczak34@gmail.com>
Date: Tue, 31 Jan 2023 18:38:01 +0000 (+0000)
Subject: net: report IsNotFound when getnameinfo returns EAI_NONAME
X-Git-Tag: go1.21rc1~1700
X-Git-Url: http://www.git.cypherpunks.su/?a=commitdiff_plain;h=de2efc2aa1448cfcf28fec66ce0ff3f979fc2f12;p=gostls13.git

net: report IsNotFound when getnameinfo returns EAI_NONAME

Fixes #57548

Change-Id: I4092624b1e906fbcd520f43aa4bc71c144dea3b6
GitHub-Last-Rev: ab048359473978ee245188710b6d6e12d50fb0ab
GitHub-Pull-Request: golang/go#57549
Reviewed-on: https://go-review.googlesource.com/c/go/+/460255
Auto-Submit: Ian Lance Taylor <iant@google.com>
Reviewed-by: Bryan Mills <bcmills@google.com>
Reviewed-by: Damien Neil <dneil@google.com>
Run-TryBot: Ian Lance Taylor <iant@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@google.com>
---

diff --git a/src/net/cgo_unix.go b/src/net/cgo_unix.go
index 0cb71c7d38..d76652f054 100644
--- a/src/net/cgo_unix.go
+++ b/src/net/cgo_unix.go
@@ -260,17 +260,21 @@ func cgoLookupAddrPTR(addr string, sa *_C_struct_sockaddr, salen _C_socklen_t) (
 		}
 	}
 	if gerrno != 0 {
+		isErrorNoSuchHost := false
 		isTemporary := false
 		switch gerrno {
 		case _C_EAI_SYSTEM:
 			if err == nil { // see golang.org/issue/6232
 				err = syscall.EMFILE
 			}
+		case _C_EAI_NONAME:
+			err = errNoSuchHost
+			isErrorNoSuchHost = true
 		default:
 			err = addrinfoErrno(gerrno)
 			isTemporary = addrinfoErrno(gerrno).Temporary()
 		}
-		return nil, &DNSError{Err: err.Error(), Name: addr, IsTemporary: isTemporary}
+		return nil, &DNSError{Err: err.Error(), Name: addr, IsTemporary: isTemporary, IsNotFound: isErrorNoSuchHost}
 	}
 	for i := 0; i < len(b); i++ {
 		if b[i] == 0 {