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Test each address returned in the getaddrinfo() call and stop blindly preferring IPv4

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Fixes NAT64 on iOS 12 and probably other obscure configurations
This commit is contained in:
Cameron Gutman
2018-11-16 00:37:38 -08:00
parent d9210a6a9a
commit 396b02a94d
4 changed files with 41 additions and 35 deletions
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8
src/SimpleStun.c
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@@ -52,18 +52,12 @@ int LiFindExternalAddressIP4(const char* stunServer, unsigned short stunPort, un
char buf[1024];
} resp;
err = resolveHostName(stunServer, &stunAddr, &stunAddrLen);
err = resolveHostName(stunServer, AF_INET, 0, &stunAddr, &stunAddrLen);
if (err != 0) {
Limelog("Failed to resolve STUN server: %d\n", err);
return err;
}
// We must use IPv4 to talk to the STUN server to get our IPv4 address back
if (stunAddr.ss_family != AF_INET) {
Limelog("STUN server was not reachable over IPv4\n");
return -1;
}
sock = bindUdpSocket(AF_INET, 2048);
if (sock == INVALID_SOCKET) {
err = LastSocketFail();