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Problem: zmq_connect (TCP) has no IPv4 fallback

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Solution: if opening an IPv6 TCP socket fails because IPv6 is not
available, try to open an IPv4 socket instead when creating and
connecting a TCP endpoint.
This commit is contained in:
Luca Boccassi 2016-04-07 13:15:41 +01:00
parent d169281a00
commit 99a8795dfe
1 changed files with 14 additions and 0 deletions
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14
src/tcp_connecter.cpp
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@ -271,6 +271,20 @@ int zmq::tcp_connecter_t::open ()
// Create the socket.
s = open_socket (tcp_addr->family (), SOCK_STREAM, IPPROTO_TCP);
// IPv6 address family not supported, try automatic downgrade to IPv4.
if (s == -1 && tcp_addr->family () == AF_INET6
&& errno == EAFNOSUPPORT
&& options.ipv6) {
rc = addr->resolved.tcp_addr->resolve (
addr->address.c_str (), false, false);
if (rc != 0) {
LIBZMQ_DELETE(addr->resolved.tcp_addr);
return -1;
}
s = open_socket (AF_INET, SOCK_STREAM, IPPROTO_TCP);
}
#ifdef ZMQ_HAVE_WINDOWS
if (s == INVALID_SOCKET) {
errno = wsa_error_to_errno (WSAGetLastError ());