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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 792ee7690e
commit 6892b7b60d
1 changed files with 12 additions and 0 deletions
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12
src/tcp_connecter.cpp
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@ -209,6 +209,18 @@ int zmq::tcp_connecter_t::open ()
// Create the socket. // Create the socket.
s = open_socket (addr->resolved.tcp_addr->family (), SOCK_STREAM, IPPROTO_TCP); s = open_socket (addr->resolved.tcp_addr->family (), SOCK_STREAM, IPPROTO_TCP);
// IPv6 address family not supported, try automatic downgrade to IPv4.
if (s == -1 && addr->resolved.tcp_addr->family () == AF_INET6
&& errno == EAFNOSUPPORT
&& options.ipv6) {
int rc = addr->resolved.tcp_addr->resolve (
addr->address.c_str (), false, false);
if (rc != 0)
return -1;
s = open_socket (AF_INET, SOCK_STREAM, IPPROTO_TCP);
}
#ifdef ZMQ_HAVE_WINDOWS #ifdef ZMQ_HAVE_WINDOWS
if (s == INVALID_SOCKET) { if (s == INVALID_SOCKET) {
errno = wsa_error_to_errno (WSAGetLastError ()); errno = wsa_error_to_errno (WSAGetLastError ());