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Added an initiator-only socket implementation which binds ports on demand

laforge/swu
Martin Willi 2010-02-24 10:58:23 +01:00
parent 40706b6027
commit 9ed1bb4842
7 changed files with 790 additions and 1 deletions
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6
configure.in
View File

@ -116,6 +116,7 @@ ARG_ENABL_SET([kernel-pfroute], [enable the PF_ROUTE kernel interface.])
ARG_ENABL_SET([kernel-klips], [enable the KLIPS kernel interface.])
ARG_DISBL_SET([socket-default], [disable default socket implementation for charon.])
ARG_ENABL_SET([socket-raw], [enable raw socket implementation of charon, enforced if pluto is enabled])
ARG_ENABL_SET([socket-dynamic], [enable dynamic socket implementation for charon])
ARG_ENABL_SET([nat-transport], [enable NAT traversal with IPsec transport mode in pluto.])
ARG_DISBL_SET([vendor-id], [disable the sending of the strongSwan vendor ID in pluto.])
ARG_DISBL_SET([xauth-vid], [disable the sending of the XAUTH vendor ID.])
@ -238,9 +239,10 @@ fi
if test x$pluto = xtrue; then
if test x$socket_raw = xfalse; then
AC_MSG_NOTICE([Enforcing --enable-socket-raw/--disable-socket-default, as pluto is enabled])
AC_MSG_NOTICE([Enforcing --enable-socket-raw, as pluto is enabled])
socket_default=false
socket_raw=true
socket_dynamic=false
fi
fi
@ -812,6 +814,7 @@ AM_CONDITIONAL(USE_KERNEL_PFROUTE, test x$kernel_pfroute = xtrue)
AM_CONDITIONAL(USE_KERNEL_KLIPS, test x$kernel_klips = xtrue)
AM_CONDITIONAL(USE_SOCKET_DEFAULT, test x$socket_default = xtrue)
AM_CONDITIONAL(USE_SOCKET_RAW, test x$socket_raw = xtrue)
AM_CONDITIONAL(USE_SOCKET_DYNAMIC, test x$socket_dynamic = xtrue)
dnl other options
dnl =============
@ -908,6 +911,7 @@ AC_OUTPUT(
src/charon/plugins/kernel_klips/Makefile
src/charon/plugins/socket_default/Makefile
src/charon/plugins/socket_raw/Makefile
src/charon/plugins/socket_dynamic/Makefile
src/charon/plugins/smp/Makefile
src/charon/plugins/sql/Makefile
src/charon/plugins/medsrv/Makefile

5
src/charon/Makefile.am
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@ -164,6 +164,11 @@ if USE_SOCKET_RAW
PLUGINS += socket-raw
endif
if USE_SOCKET_DYNAMIC
SUBDIRS += plugins/socket_dynamic
PLUGINS += socket-dynamic
endif
if USE_STROKE
SUBDIRS += plugins/stroke
PLUGINS += stroke

11
src/charon/plugins/socket_dynamic/Makefile.am Normal file
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@ -0,0 +1,11 @@
INCLUDES = -I${linux_headers} -I$(top_srcdir)/src/libstrongswan -I$(top_srcdir)/src/charon
AM_CFLAGS = -rdynamic
plugin_LTLIBRARIES = libstrongswan-socket-dynamic.la
libstrongswan_socket_dynamic_la_SOURCES = \
socket_dynamic_plugin.h socket_dynamic_plugin.c \
socket_dynamic_socket.h socket_dynamic_socket.c
libstrongswan_socket_dynamic_la_LDFLAGS = -module -avoid-version

69
src/charon/plugins/socket_dynamic/socket_dynamic_plugin.c Normal file
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@ -0,0 +1,69 @@
/*
* Copyright (C) 2010 Martin Willi
* Copyright (C) 2010 revosec AG
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
*
* This program 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 General Public License
* for more details.
*/
#include "socket_dynamic_plugin.h"
#include "socket_dynamic_socket.h"
#include <daemon.h>
typedef struct private_socket_dynamic_plugin_t private_socket_dynamic_plugin_t;
/**
* Private data of socket plugin
*/
struct private_socket_dynamic_plugin_t {
/**
* Implements plugin interface
*/
socket_dynamic_plugin_t public;
/**
* Socket instance.
*/
socket_dynamic_socket_t *socket;
};
METHOD(plugin_t, destroy, void,
private_socket_dynamic_plugin_t *this)
{
charon->socket->remove_socket(charon->socket, &this->socket->socket);
this->socket->destroy(this->socket);
free(this);
}
/*
* see header file
*/
plugin_t *plugin_create()
{
private_socket_dynamic_plugin_t *this;
INIT(this,
.public.plugin.destroy = _destroy,
.socket = socket_dynamic_socket_create(),
);
if (!this->socket)
{
free(this);
return NULL;
}
charon->socket->add_socket(charon->socket, &this->socket->socket);
return &this->public.plugin;
}

47
src/charon/plugins/socket_dynamic/socket_dynamic_plugin.h Normal file
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@ -0,0 +1,47 @@
/*
* Copyright (C) 2010 Martin Willi
* Copyright (C) 2010 revosec AG
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
*
* This program 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 General Public License
* for more details.
*/
/**
* @defgroup socket_dynamic socket_dynamic
* @ingroup cplugins
*
* @defgroup socket_dynamic_plugin socket_dynamic_plugin
* @{ @ingroup socket_dynamic
*/
#ifndef SOCKET_DYNAMIC_PLUGIN_H_
#define SOCKET_DYNAMIC_PLUGIN_H_
#include <plugins/plugin.h>
typedef struct socket_dynamic_plugin_t socket_dynamic_plugin_t;
/**
* Plugin providing a socket that binds ports dynamically.
*/
struct socket_dynamic_plugin_t {
/**
* implements plugin interface
*/
plugin_t plugin;
};
/**
* Create a socket_dynamic_plugin instance.
*/
plugin_t *plugin_create();
#endif /** SOCKET_DYNAMIC_PLUGIN_H_ @}*/

604
src/charon/plugins/socket_dynamic/socket_dynamic_socket.c Normal file
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@ -0,0 +1,604 @@
/*
* Copyright (C) 2006-2009 Tobias Brunner
* Copyright (C) 2006 Daniel Roethlisberger
* Copyright (C) 2005-2010 Martin Willi
* Copyright (C) 2005 Jan Hutter
* Hochschule fuer Technik Rapperswil
* Copyright (C) 2010 revosec AG
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
*
* This program 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 General Public License
* for more details.
*/
/* for struct in6_pktinfo */
#define _GNU_SOURCE
#include "socket_dynamic_socket.h"
#include <sys/types.h>
#include <sys/socket.h>
#include <string.h>
#include <errno.h>
#include <unistd.h>
#include <stdlib.h>
#include <fcntl.h>
#include <sys/ioctl.h>
#include <netinet/in_systm.h>
#include <netinet/in.h>
#include <netinet/ip.h>
#include <netinet/udp.h>
#include <net/if.h>
#include <daemon.h>
#include <threading/thread.h>
#include <utils/hashtable.h>
/* Maximum size of a packet */
#define MAX_PACKET 5000
/* length of non-esp marker */
#define MARKER_LEN sizeof(u_int32_t)
/* from linux/udp.h */
#ifndef UDP_ENCAP
#define UDP_ENCAP 100
#endif /*UDP_ENCAP*/
#ifndef UDP_ENCAP_ESPINUDP
#define UDP_ENCAP_ESPINUDP 2
#endif /*UDP_ENCAP_ESPINUDP*/
/* these are not defined on some platforms */
#ifndef SOL_IP
#define SOL_IP IPPROTO_IP
#endif
#ifndef SOL_IPV6
#define SOL_IPV6 IPPROTO_IPV6
#endif
#ifndef SOL_UDP
#define SOL_UDP IPPROTO_UDP
#endif
/* IPV6_RECVPKTINFO is defined in RFC 3542 which obsoletes RFC 2292 that
* previously defined IPV6_PKTINFO */
#ifndef IPV6_RECVPKTINFO
#define IPV6_RECVPKTINFO IPV6_PKTINFO
#endif
typedef struct private_socket_dynamic_socket_t private_socket_dynamic_socket_t;
typedef struct dynsock_t dynsock_t;
/**
* Private data of an socket_t object
*/
struct private_socket_dynamic_socket_t {
/**
* public functions
*/
socket_dynamic_socket_t public;
/**
* Hashtable of bound sockets
*/
hashtable_t *sockets;
/**
* Notification pipe to signal receiver
*/
int notify[2];
};
/**
* Struct for a dynamically allocated socket
*/
struct dynsock_t {
/**
* File descriptor of socket
*/
int fd;
/**
* Address family
*/
int family;
/**
* Bound source port
*/
u_int16_t port;
};
/**
* Hash function for hashtable
*/
static u_int hash(dynsock_t *key)
{
return (key->family << 16) | key->port;
}
/**
* Equals function for hashtable
*/
static bool equals(dynsock_t *a, dynsock_t *b)
{
return a->family == b->family && a->port == b->port;
}
/**
* Create a fd_set from all bound sockets
*/
static int build_fds(private_socket_dynamic_socket_t *this, fd_set *fds)
{
enumerator_t *enumerator;
dynsock_t *key, *value;
int maxfd;
FD_ZERO(fds);
FD_SET(this->notify[0], fds);
maxfd = this->notify[0];
enumerator = this->sockets->create_enumerator(this->sockets);
while (enumerator->enumerate(enumerator, &key, &value))
{
FD_SET(value->fd, fds);
maxfd = max(maxfd, value->fd);
}
enumerator->destroy(enumerator);
return maxfd + 1;
}
/**
* Find the socket select()ed
*/
static dynsock_t* scan_fds(private_socket_dynamic_socket_t *this, fd_set *fds)
{
enumerator_t *enumerator;
dynsock_t *key, *value, *selected = NULL;
enumerator = this->sockets->create_enumerator(this->sockets);
while (enumerator->enumerate(enumerator, &key, &value))
{
if (FD_ISSET(value->fd, fds))
{
selected = value;
break;
}
}
enumerator->destroy(enumerator);
return selected;
}
/**
* Receive a packet from a given socket fd
*/
static packet_t *receive_packet(private_socket_dynamic_socket_t *this,
dynsock_t *skt)
{
host_t *source = NULL, *dest = NULL;
ssize_t len;
char buffer[MAX_PACKET];
chunk_t data;
packet_t *packet;
struct msghdr msg;
struct cmsghdr *cmsgptr;
struct iovec iov;
char ancillary[64];
union {
struct sockaddr_in in4;
struct sockaddr_in6 in6;
} src;
msg.msg_name = &src;
msg.msg_namelen = sizeof(src);
iov.iov_base = buffer;
iov.iov_len = sizeof(buffer);
msg.msg_iov = &iov;
msg.msg_iovlen = 1;
msg.msg_control = ancillary;
msg.msg_controllen = sizeof(ancillary);
msg.msg_flags = 0;
len = recvmsg(skt->fd, &msg, 0);
if (len < 0)
{
DBG1(DBG_NET, "error reading socket: %s", strerror(errno));
return NULL;
}
DBG3(DBG_NET, "received packet %b", buffer, len);
if (len < MARKER_LEN)
{
DBG3(DBG_NET, "received packet too short (%d bytes)", len);
return NULL;
}
/* read ancillary data to get destination address */
for (cmsgptr = CMSG_FIRSTHDR(&msg); cmsgptr != NULL;
cmsgptr = CMSG_NXTHDR(&msg, cmsgptr))
{
if (cmsgptr->cmsg_len == 0)
{
DBG1(DBG_NET, "error reading ancillary data");
return NULL;
}
if (cmsgptr->cmsg_level == SOL_IPV6 &&
cmsgptr->cmsg_type == IPV6_PKTINFO)
{
struct in6_pktinfo *pktinfo;
struct sockaddr_in6 dst;
pktinfo = (struct in6_pktinfo*)CMSG_DATA(cmsgptr);
memset(&dst, 0, sizeof(dst));
memcpy(&dst.sin6_addr, &pktinfo->ipi6_addr, sizeof(dst.sin6_addr));
dst.sin6_family = AF_INET6;
dst.sin6_port = htons(skt->port);
dest = host_create_from_sockaddr((sockaddr_t*)&dst);
}
if (cmsgptr->cmsg_level == SOL_IP &&
cmsgptr->cmsg_type == IP_PKTINFO)
{
struct in_pktinfo *pktinfo;
struct sockaddr_in dst;
pktinfo = (struct in_pktinfo*)CMSG_DATA(cmsgptr);
memset(&dst, 0, sizeof(dst));
memcpy(&dst.sin_addr, &pktinfo->ipi_addr, sizeof(dst.sin_addr));
dst.sin_family = AF_INET;
dst.sin_port = htons(skt->port);
dest = host_create_from_sockaddr((sockaddr_t*)&dst);
}
if (dest)
{
break;
}
}
if (dest == NULL)
{
DBG1(DBG_NET, "error reading IP header");
return NULL;
}
source = host_create_from_sockaddr((sockaddr_t*)&src);
DBG2(DBG_NET, "received packet: from %#H to %#H", source, dest);
data = chunk_create(buffer, len);
packet = packet_create();
packet->set_source(packet, source);
packet->set_destination(packet, dest);
/* we assume a non-ESP marker if none of the ports is on 500 */
if (dest->get_port(dest) != IKEV2_UDP_PORT &&
source->get_port(source) != IKEV2_UDP_PORT)
{
data = chunk_skip(data, MARKER_LEN);
}
packet->set_data(packet, chunk_clone(data));
return packet;
}
METHOD(socket_t, receiver, status_t,
private_socket_dynamic_socket_t *this, packet_t **packet)
{
dynsock_t *selected;
packet_t *pkt;
bool oldstate;
fd_set fds;
int maxfd;
while (TRUE)
{
maxfd = build_fds(this, &fds);
DBG2(DBG_NET, "waiting for data on sockets");
oldstate = thread_cancelability(TRUE);
if (select(maxfd, &fds, NULL, NULL, NULL) <= 0)
{
thread_cancelability(oldstate);
return FAILED;
}
thread_cancelability(oldstate);
if (FD_ISSET(this->notify[0], &fds))
{ /* got notified, read garbage, rebuild fdset */
char buf[1];
ignore_result(read(this->notify[0], buf, sizeof(buf)));
DBG2(DBG_NET, "rebuilding fdset due to newly bound ports");
continue;
}
selected = scan_fds(this, &fds);
if (selected)
{
break;
}
}
pkt = receive_packet(this, selected);
if (pkt)
{
*packet = pkt;
return SUCCESS;
}
return FAILED;
}
/**
* open a socket to send and receive packets
*/
static int open_socket(private_socket_dynamic_socket_t *this,
int family, u_int16_t port, bool first)
{
int on = TRUE, type = UDP_ENCAP_ESPINUDP;
struct sockaddr_storage addr;
socklen_t addrlen;
u_int sol, pktinfo = 0;
int fd;
memset(&addr, 0, sizeof(addr));
/* precalculate constants depending on address family */
switch (family)
{
case AF_INET:
{
struct sockaddr_in *sin = (struct sockaddr_in *)&addr;
sin->sin_family = AF_INET;
sin->sin_addr.s_addr = INADDR_ANY;
sin->sin_port = htons(port);
addrlen = sizeof(struct sockaddr_in);
sol = SOL_IP;
pktinfo = IP_PKTINFO;
break;
}
case AF_INET6:
{
struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)&addr;
sin6->sin6_family = AF_INET6;
memset(&sin6->sin6_addr, 0, sizeof(sin6->sin6_addr));
sin6->sin6_port = htons(port);
addrlen = sizeof(struct sockaddr_in6);
sol = SOL_IPV6;
pktinfo = IPV6_RECVPKTINFO;
break;
}
default:
return 0;
}
fd = socket(family, SOCK_DGRAM, IPPROTO_UDP);
if (fd < 0)
{
DBG1(DBG_NET, "could not open socket: %s", strerror(errno));
return 0;
}
if (setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, (void*)&on, sizeof(on)) < 0)
{
DBG1(DBG_NET, "unable to set SO_REUSEADDR on socket: %s", strerror(errno));
close(fd);
return 0;
}
/* bind the socket */
if (bind(fd, (struct sockaddr *)&addr, addrlen) < 0)
{
DBG1(DBG_NET, "unable to bind socket: %s", strerror(errno));
close(fd);
return 0;
}
/* get additional packet info on receive */
if (setsockopt(fd, sol, pktinfo, &on, sizeof(on)) < 0)
{
DBG1(DBG_NET, "unable to set IP_PKTINFO on socket: %s", strerror(errno));
close(fd);
return 0;
}
if (!charon->kernel_interface->bypass_socket(charon->kernel_interface,
fd, family))
{
DBG1(DBG_NET, "installing IKE bypass policy failed");
}
/* enable UDP decapsulation globally, only for one socket needed */
if (first && setsockopt(fd, SOL_UDP, UDP_ENCAP, &type, sizeof(type)) < 0)
{
DBG1(DBG_NET, "unable to set UDP_ENCAP: %s", strerror(errno));
}
return fd;
}
/**
* Find/Create a socket to send from host
*/
static dynsock_t *find_socket(private_socket_dynamic_socket_t *this,
int family, u_int16_t port)
{
dynsock_t *skt, lookup = {
.family = family,
.port = port,
};
char buf[] = {0x01};
int fd;
skt = this->sockets->get(this->sockets, &lookup);
if (skt)
{
return skt;
}
fd = open_socket(this, family, port,
this->sockets->get_count(this->sockets));
if (!fd)
{
return NULL;
}
INIT(skt,
.family = family,
.port = port,
.fd = fd,
);
this->sockets->put(this->sockets, skt, skt);
/* notify receiver thread to reread socket list */
ignore_result(write(this->notify[1], buf, sizeof(buf)));
return skt;
}
METHOD(socket_t, sender, status_t,
private_socket_dynamic_socket_t *this, packet_t *packet)
{
dynsock_t *skt;
host_t *src, *dst;
int port, family;
ssize_t len;
chunk_t data, marked;
struct msghdr msg;
struct cmsghdr *cmsg;
struct iovec iov;
src = packet->get_source(packet);
dst = packet->get_destination(packet);
family = src->get_family(src);
port = src->get_port(src);
skt = find_socket(this, family, port);
if (!skt)
{
return FAILED;
}
data = packet->get_data(packet);
DBG2(DBG_NET, "sending packet: from %#H to %#H", src, dst);
/* use non-ESP marker if none of the ports is 500, not for keep alives */
if (port != IKEV2_UDP_PORT && dst->get_port(dst) != IKEV2_UDP_PORT &&
!(data.len == 1 && data.ptr[0] == 0xFF))
{
/* add non esp marker to packet */
if (data.len > MAX_PACKET - MARKER_LEN)
{
DBG1(DBG_NET, "unable to send packet: it's too big (%d bytes)",
data.len);
return FAILED;
}
marked = chunk_alloc(data.len + MARKER_LEN);
memset(marked.ptr, 0, MARKER_LEN);
memcpy(marked.ptr + MARKER_LEN, data.ptr, data.len);
/* let the packet do the clean up for us */
packet->set_data(packet, marked);
data = marked;
}
memset(&msg, 0, sizeof(struct msghdr));
msg.msg_name = dst->get_sockaddr(dst);;
msg.msg_namelen = *dst->get_sockaddr_len(dst);
iov.iov_base = data.ptr;
iov.iov_len = data.len;
msg.msg_iov = &iov;
msg.msg_iovlen = 1;
msg.msg_flags = 0;
if (!src->is_anyaddr(src))
{
if (family == AF_INET)
{
struct in_addr *addr;
struct sockaddr_in *sin;
char buf[CMSG_SPACE(sizeof(struct in_pktinfo))];
struct in_pktinfo *pktinfo;
msg.msg_control = buf;
msg.msg_controllen = sizeof(buf);
cmsg = CMSG_FIRSTHDR(&msg);
cmsg->cmsg_level = SOL_IP;
cmsg->cmsg_type = IP_PKTINFO;
cmsg->cmsg_len = CMSG_LEN(sizeof(struct in_pktinfo));
pktinfo = (struct in_pktinfo*)CMSG_DATA(cmsg);
memset(pktinfo, 0, sizeof(struct in_pktinfo));
addr = &pktinfo->ipi_spec_dst;
sin = (struct sockaddr_in*)src->get_sockaddr(src);
memcpy(addr, &sin->sin_addr, sizeof(struct in_addr));
}
else
{
char buf[CMSG_SPACE(sizeof(struct in6_pktinfo))];
struct in6_pktinfo *pktinfo;
struct sockaddr_in6 *sin;
msg.msg_control = buf;
msg.msg_controllen = sizeof(buf);
cmsg = CMSG_FIRSTHDR(&msg);
cmsg->cmsg_level = SOL_IPV6;
cmsg->cmsg_type = IPV6_PKTINFO;
cmsg->cmsg_len = CMSG_LEN(sizeof(struct in6_pktinfo));
pktinfo = (struct in6_pktinfo*)CMSG_DATA(cmsg);
memset(pktinfo, 0, sizeof(struct in6_pktinfo));
sin = (struct sockaddr_in6*)src->get_sockaddr(src);
memcpy(&pktinfo->ipi6_addr, &sin->sin6_addr, sizeof(struct in6_addr));
}
}
len = sendmsg(skt->fd, &msg, 0);
if (len != data.len)
{
DBG1(DBG_NET, "error writing to socket: %s", strerror(errno));
return FAILED;
}
return SUCCESS;
}
METHOD(socket_dynamic_socket_t, destroy, void,
private_socket_dynamic_socket_t *this)
{
enumerator_t *enumerator;
dynsock_t *key, *value;
enumerator = this->sockets->create_enumerator(this->sockets);
while (enumerator->enumerate(enumerator, &key, &value))
{
close(value->fd);
free(value);
}
enumerator->destroy(enumerator);
this->sockets->destroy(this->sockets);
close(this->notify[0]);
close(this->notify[1]);
free(this);
}
/*
* See header for description
*/
socket_dynamic_socket_t *socket_dynamic_socket_create()
{
private_socket_dynamic_socket_t *this;
INIT(this,
.public = {
.socket = {
.send = _sender,
.receive = _receiver,
},
.destroy = _destroy,
},
);
if (pipe(this->notify) != 0)
{
DBG1(DBG_NET, "creating notify pipe for dynamic socket failed");
free(this);
return NULL;
}
this->sockets = hashtable_create((void*)hash, (void*)equals, 8);
return &this->public;
}

49
src/charon/plugins/socket_dynamic/socket_dynamic_socket.h Normal file
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@ -0,0 +1,49 @@
/*
* Copyright (C) 2010 Martin Willi
* Copyright (C) 2010 revosec AG
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
*
* This program 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 General Public License
* for more details.
*/
/**
* @defgroup socket_dynamic_socket socket_dynamic_socket
* @{ @ingroup socket_dynamic
*/
#ifndef SOCKET_DYNAMIC_SOCKET_H_
#define SOCKET_DYNAMIC_SOCKET_H_
typedef struct socket_dynamic_socket_t socket_dynamic_socket_t;
#include <network/socket.h>
/**
* A socket implementation binding to ports on demand as required.
*/
struct socket_dynamic_socket_t {
/**
* Implements the socket_t interface.
*/
socket_t socket;
/**
* Destroy a socket_dynamic_socket_t.
*/
void (*destroy)(socket_dynamic_socket_t *this);
};
/**
* Create a socket_dynamic_socket instance.
*/
socket_dynamic_socket_t *socket_dynamic_socket_create();
#endif /** SOCKET_DYNAMIC_SOCKET_H_ @}*/