tipc_listener.cpp

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/* SPDX-License-Identifier: MPL-2.0 */
 
#include "precompiled.hpp"
 
#include "tipc_listener.hpp"
 
#if defined ZMQ_HAVE_TIPC
 
#include <new>
 
#include <string.h>
 
#include "tipc_address.hpp"
#include "io_thread.hpp"
#include "config.hpp"
#include "err.hpp"
#include "ip.hpp"
#include "socket_base.hpp"
#include "address.hpp"
 
#include <unistd.h>
#include <sys/socket.h>
#include <fcntl.h>
#if defined ZMQ_HAVE_VXWORKS
#include <sockLib.h>
#include <tipc/tipc.h>
#else
#include <linux/tipc.h>
#endif
 
zmq::tipc_listener_t::tipc_listener_t (io_thread_t *io_thread_,
                                       socket_base_t *socket_,
                                       const options_t &options_) :
    stream_listener_base_t (io_thread_, socket_, options_)
{
}
 
void zmq::tipc_listener_t::in_event ()
{
    fd_t fd = accept ();
 
    //  If connection was reset by the peer in the meantime, just ignore it.
    //  TODO: Handle specific errors like ENFILE/EMFILE etc.
    if (fd == retired_fd) {
        _socket->event_accept_failed (
          make_unconnected_bind_endpoint_pair (_endpoint), zmq_errno ());
        return;
    }
 
    //  Create the engine object for this connection.
    create_engine (fd);
}
 
std::string
zmq::tipc_listener_t::get_socket_name (zmq::fd_t fd_,
                                       socket_end_t socket_end_) const
{
    return zmq::get_socket_name<tipc_address_t> (fd_, socket_end_);
}
 
int zmq::tipc_listener_t::set_local_address (const char *addr_)
{
    // Convert str to address struct
    int rc = _address.resolve (addr_);
    if (rc != 0)
        return -1;
 
    // Cannot bind non-random Port Identity
    const sockaddr_tipc *const a =
      reinterpret_cast<const sockaddr_tipc *> (_address.addr ());
    if (!_address.is_random () && a->addrtype == TIPC_ADDR_ID) {
        errno = EINVAL;
        return -1;
    }
 
    //  Create a listening socket.
    _s = open_socket (AF_TIPC, SOCK_STREAM, 0);
    if (_s == retired_fd)
        return -1;
 
    // If random Port Identity, update address object to reflect the assigned address
    if (_address.is_random ()) {
        struct sockaddr_storage ss;
        const zmq_socklen_t sl = get_socket_address (_s, socket_end_local, &ss);
        if (sl == 0)
            goto error;
 
        _address =
          tipc_address_t (reinterpret_cast<struct sockaddr *> (&ss), sl);
    }
 
 
    _address.to_string (_endpoint);
 
    //  Bind the socket to tipc name
    if (_address.is_service ()) {
#ifdef ZMQ_HAVE_VXWORKS
        rc = bind (_s, (sockaddr *) address.addr (), address.addrlen ());
#else
        rc = bind (_s, _address.addr (), _address.addrlen ());
#endif
        if (rc != 0)
            goto error;
    }
 
    //  Listen for incoming connections.
    rc = listen (_s, options.backlog);
    if (rc != 0)
        goto error;
 
    _socket->event_listening (make_unconnected_bind_endpoint_pair (_endpoint),
                              _s);
    return 0;
 
error:
    int err = errno;
    close ();
    errno = err;
    return -1;
}
 
zmq::fd_t zmq::tipc_listener_t::accept ()
{
    //  Accept one connection and deal with different failure modes.
    //  The situation where connection cannot be accepted due to insufficient
    //  resources is considered valid and treated by ignoring the connection.
    struct sockaddr_storage ss = {};
    socklen_t ss_len = sizeof (ss);
 
    zmq_assert (_s != retired_fd);
#ifdef ZMQ_HAVE_VXWORKS
    fd_t sock = ::accept (_s, (struct sockaddr *) &ss, (int *) &ss_len);
#else
    fd_t sock =
      ::accept (_s, reinterpret_cast<struct sockaddr *> (&ss), &ss_len);
#endif
    if (sock == -1) {
        errno_assert (errno == EAGAIN || errno == EWOULDBLOCK
                      || errno == ENOBUFS || errno == EINTR
                      || errno == ECONNABORTED || errno == EPROTO
                      || errno == EMFILE || errno == ENFILE);
        return retired_fd;
    }
    /*FIXME Accept filters?*/
    return sock;
}
 
#endif