chore: handle two interfaces have the same prefix but different address

Author: wwqgtxx

component/iface/iface.go

@@ -84,7 +84,14 @@ func getCache() (*ifaceCache, error) {
 				continue // interface down
 			}
 			for _, prefix := range ipNets {
-				cache.ifTable.Insert(prefix, ifaceObj)
+				if _, ok := cache.ifTable.Get(prefix); ok {
+					// maybe two interfaces have the same prefix but different address,
+					// so we add a special /32(ipv4) or /128(ipv6) item to let ResolveInterfaceByAddr
+					// could find the correct interface
+					cache.ifTable.Insert(netip.PrefixFrom(prefix.Addr(), prefix.Addr().BitLen()), ifaceObj)
+				} else {
+					cache.ifTable.Insert(prefix, ifaceObj)
+				}
 			}
 		}
 

go.mod

@@ -25,7 +25,7 @@ require (
 	github.com/metacubex/gopacket v1.1.20-0.20230608035415-7e2f98a3e759
 	github.com/metacubex/quic-go v0.52.1-0.20250522021943-aef454b9e639
 	github.com/metacubex/randv2 v0.2.0
-	github.com/metacubex/sing v0.5.3-0.20250504031621-1f99e54c15b7
+	github.com/metacubex/sing v0.5.3
 	github.com/metacubex/sing-mux v0.3.2
 	github.com/metacubex/sing-quic v0.0.0-20250523120938-f1a248e5ec7f
 	github.com/metacubex/sing-shadowsocks v0.2.9

go.sum

@@ -116,8 +116,8 @@ github.com/metacubex/quic-go v0.52.1-0.20250522021943-aef454b9e639/go.mod h1:Kc6
 github.com/metacubex/randv2 v0.2.0 h1:uP38uBvV2SxYfLj53kuvAjbND4RUDfFJjwr4UigMiLs=
 github.com/metacubex/randv2 v0.2.0/go.mod h1:kFi2SzrQ5WuneuoLLCMkABtiBu6VRrMrWFqSPyj2cxY=
 github.com/metacubex/sing v0.5.2/go.mod h1:ypf0mjwlZm0sKdQSY+yQvmsbWa0hNPtkeqyRMGgoN+w=
-github.com/metacubex/sing v0.5.3-0.20250504031621-1f99e54c15b7 h1:m4nSxvw46JEgxMzzmnXams+ebwabcry4Ydep/zNiesQ=
-github.com/metacubex/sing v0.5.3-0.20250504031621-1f99e54c15b7/go.mod h1:ypf0mjwlZm0sKdQSY+yQvmsbWa0hNPtkeqyRMGgoN+w=
+github.com/metacubex/sing v0.5.3 h1:QWdN16WFKMk06x4nzkc8SvZ7y2x+TLQrpkPoHs+WSVM=
+github.com/metacubex/sing v0.5.3/go.mod h1:ypf0mjwlZm0sKdQSY+yQvmsbWa0hNPtkeqyRMGgoN+w=
 github.com/metacubex/sing-mux v0.3.2 h1:nJv52pyRivHcaZJKk2JgxpaVvj1GAXG81scSa9N7ncw=
 github.com/metacubex/sing-mux v0.3.2/go.mod h1:3rt1soewn0O6j89GCLmwAQFsq257u0jf2zQSPhTL3Bw=
 github.com/metacubex/sing-quic v0.0.0-20250523120938-f1a248e5ec7f h1:mP3vIm+9hRFI0C0Vl3pE0NESF/L85FDbuB0tGgUii6I=