Add the VMCI transport.

VMCI transport allows fast communication between the Host
and a virtual machine, between virtual machines on the same host,
and within a virtual machine (like IPC).

It requires VMware to be installed on the host and Guest Additions
to be installed on a guest.

src/vmci_address.cpp

@@ -0,0 +1,161 @@
+/*
+    Copyright (c) 2007-2015 Contributors as noted in the AUTHORS file
+
+    This file is part of libzmq, the ZeroMQ core engine in C++.
+
+    libzmq is free software; you can redistribute it and/or modify it under
+    the terms of the GNU Lesser General Public License (LGPL) as published
+    by the Free Software Foundation; either version 3 of the License, or
+    (at your option) any later version.
+
+    As a special exception, the Contributors give you permission to link
+    this library with independent modules to produce an executable,
+    regardless of the license terms of these independent modules, and to
+    copy and distribute the resulting executable under terms of your choice,
+    provided that you also meet, for each linked independent module, the
+    terms and conditions of the license of that module. An independent
+    module is a module which is not derived from or based on this library.
+    If you modify this library, you must extend this exception to your
+    version of the library.
+
+    libzmq is distributed in the hope that it will be useful, but WITHOUT
+    ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+    FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
+    License for more details.
+
+    You should have received a copy of the GNU Lesser General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include "vmci_address.hpp"
+
+#if defined(ZMQ_HAVE_VMCI)
+
+#include <climits>
+#include <string>
+#include <sstream>
+
+#include "ctx.hpp"
+#include "err.hpp"
+
+zmq::vmci_address_t::vmci_address_t(ctx_t *parent_) :
+    parent(parent_)
+{
+    memset (&address, 0, sizeof address);
+}
+
+zmq::vmci_address_t::vmci_address_t(const sockaddr *sa, socklen_t sa_len, ctx_t *parent_) :
+    parent(parent_)
+{
+    zmq_assert (sa && sa_len > 0);
+
+    memset (&address, 0, sizeof address);
+    if (sa->sa_family == parent->get_vmci_socket_family())
+        memcpy(&address, sa, sa_len);
+}
+
+zmq::vmci_address_t::~vmci_address_t ()
+{
+}
+
+int zmq::vmci_address_t::resolve(const char *path_)
+{
+    //  Find the ':' at end that separates address from the port number.
+    const char *delimiter = strrchr (path_, ':');
+    if (!delimiter) {
+        errno = EINVAL;
+        return -1;
+    }
+
+    //  Separate the address/port.
+    std::string addr_str (path_, delimiter - path_);
+    std::string port_str (delimiter + 1);
+
+    unsigned int cid = VMADDR_CID_ANY;
+    unsigned int port = VMADDR_PORT_ANY;
+
+    if (!addr_str.length()) {
+        errno = EINVAL;
+        return -1;
+    }
+    else if (addr_str != "*" && addr_str != "-1") {
+        const char *begin = addr_str.c_str();
+        char *end = NULL;
+        unsigned long l = strtoul(begin, &end, 10);
+
+        if ((l == 0 && end == begin) || (l == ULONG_MAX && errno == ERANGE) || l > UINT_MAX)
+        {
+            errno = EINVAL;
+            return -1;
+        }
+
+        cid = static_cast<unsigned int> (l);
+    }
+
+    if (!port_str.length()) {
+        errno = EINVAL;
+        return -1;
+    }
+    else if (port_str != "*" && port_str != "-1") {
+        const char *begin = port_str.c_str();
+        char *end = NULL;
+        unsigned long l = strtoul(begin, &end, 10);
+
+        if ((l == 0 && end == begin) || (l == ULONG_MAX && errno == ERANGE) || l > UINT_MAX) {
+            errno = EINVAL;
+            return -1;
+        }
+
+        port = static_cast<unsigned int> (l);
+    }
+
+    address.svm_family = static_cast<sa_family_t> (parent->get_vmci_socket_family());
+    address.svm_cid = cid;
+    address.svm_port = port;
+
+    return 0;
+}
+
+int zmq::vmci_address_t::to_string (std::string &addr_)
+{
+    if (address.svm_family != parent->get_vmci_socket_family()) {
+        addr_.clear ();
+        return -1;
+    }
+
+    std::stringstream s;
+
+    s << "vmci://";
+
+    if (address.svm_cid == VMADDR_CID_ANY) {
+        s << "*";
+    }
+    else
+    {
+        s << address.svm_cid;
+    }
+
+    s << ":";
+
+    if (address.svm_port == VMADDR_PORT_ANY) {
+        s << "*";
+    }
+    else {
+        s << address.svm_port;
+    }
+
+    addr_ = s.str ();
+    return 0;
+}
+
+const sockaddr *zmq::vmci_address_t::addr () const
+{
+    return reinterpret_cast<const sockaddr*> (&address);
+}
+
+socklen_t zmq::vmci_address_t::addrlen () const
+{
+    return static_cast<socklen_t> (sizeof address);
+}
+
+#endif