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Problem: tcp_connecter_t and tcp_listener_t duplicate code around opening and configuring a TCP socket

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Solution: extract common parts into tcp_open_socket function
This commit is contained in:
Simon Giesecke
2019-02-04 07:31:08 -05:00
parent 3f4e64edc0
commit 68d520ef68
4 changed files with 82 additions and 91 deletions
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56
src/tcp.cpp
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@@ -32,6 +32,7 @@
#include "ip.hpp"
#include "tcp.hpp"
#include "err.hpp"
#include "options.hpp"
#if !defined ZMQ_HAVE_WINDOWS
#include <fcntl.h>
@@ -381,3 +382,58 @@ void zmq::tcp_tune_loopback_fast_path (const fd_t socket_)
LIBZMQ_UNUSED (socket_);
#endif
}
zmq::fd_t zmq::tcp_open_socket (const char *address_,
const zmq::options_t &options_,
zmq::tcp_address_t *out_tcp_addr_)
{
// Convert the textual address into address structure.
int rc = out_tcp_addr_->resolve (address_, true, options_.ipv6);
if (rc != 0)
return retired_fd;
// Create the socket.
fd_t s = open_socket (out_tcp_addr_->family (), SOCK_STREAM, IPPROTO_TCP);
// IPv6 address family not supported, try automatic downgrade to IPv4.
if (s == retired_fd && out_tcp_addr_->family () == AF_INET6
&& errno == EAFNOSUPPORT && options_.ipv6) {
rc = out_tcp_addr_->resolve (address_, false, false);
if (rc != 0) {
return retired_fd;
}
s = open_socket (AF_INET, SOCK_STREAM, IPPROTO_TCP);
}
if (s == retired_fd) {
return retired_fd;
}
// On some systems, IPv4 mapping in IPv6 sockets is disabled by default.
// Switch it on in such cases.
if (out_tcp_addr_->family () == AF_INET6)
enable_ipv4_mapping (s);
// Set the IP Type-Of-Service priority for this socket
if (options_.tos != 0)
set_ip_type_of_service (s, options_.tos);
// Set the socket to loopback fastpath if configured.
if (options_.loopback_fastpath)
tcp_tune_loopback_fast_path (s);
// Bind the socket to a device if applicable
if (!options_.bound_device.empty ())
bind_to_device (s, options_.bound_device);
// Set the socket to non-blocking mode so that we get async connect().
unblock_socket (s);
// Set the socket buffer limits for the underlying socket.
if (options_.sndbuf >= 0)
set_tcp_send_buffer (s, options_.sndbuf);
if (options_.rcvbuf >= 0)
set_tcp_receive_buffer (s, options_.rcvbuf);
return s;
}