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gsocketclient: set IP_BIND_ADDRESS_NO_PORT if binding to local address

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The linux kernel does not know that the socket will be used
for connect or listen and if you bind() to a local address it must
reserve a random port (if port == 0) at bind() time, making very easy
to exhaust the ~32k port range, setting IP_BIND_ADDRESS_NO_PORT tells
the kernel to choose random port at connect() time instead, when the
full 4-tuple is known.
This commit is contained in:
Cristian Rodríguez 2020-07-29 12:10:08 -04:00 committed by Philip Withnall
parent 6cf381ee75
commit 35bb69bc47
1 changed files with 9 additions and 0 deletions
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9
gio/gsocketclient.c
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@ -24,6 +24,10 @@
#include "config.h"
#include "gsocketclient.h"
#ifndef G_OS_WIN32
#include <netinet/in.h>
#endif
#include <stdlib.h>
#include <string.h>
@ -39,6 +43,7 @@
#include <gio/gioerror.h>
#include <gio/gsocket.h>
#include <gio/gnetworkaddress.h>
#include <gio/gnetworking.h>
#include <gio/gnetworkservice.h>
#include <gio/gproxy.h>
#include <gio/gproxyresolver.h>
@ -142,6 +147,10 @@ create_socket (GSocketClient *client,
if (client->priv->local_address)
{
#ifdef IP_BIND_ADDRESS_NO_PORT
g_socket_set_option (socket, IPPROTO_IP, IP_BIND_ADDRESS_NO_PORT, 1, NULL);
#endif
if (!g_socket_bind (socket,
client->priv->local_address,
FALSE,