diff options
Diffstat (limited to 'src/libcharon/plugins/socket_dynamic')
6 files changed, 1387 insertions, 0 deletions
diff --git a/src/libcharon/plugins/socket_dynamic/Makefile.am b/src/libcharon/plugins/socket_dynamic/Makefile.am new file mode 100644 index 000000000..914945535 --- /dev/null +++ b/src/libcharon/plugins/socket_dynamic/Makefile.am @@ -0,0 +1,17 @@ + +INCLUDES = -I${linux_headers} -I$(top_srcdir)/src/libstrongswan \ + -I$(top_srcdir)/src/libhydra -I$(top_srcdir)/src/libcharon + +AM_CFLAGS = -rdynamic + +if MONOLITHIC +noinst_LTLIBRARIES = libstrongswan-socket-dynamic.la +else +plugin_LTLIBRARIES = libstrongswan-socket-dynamic.la +endif + +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 diff --git a/src/libcharon/plugins/socket_dynamic/Makefile.in b/src/libcharon/plugins/socket_dynamic/Makefile.in new file mode 100644 index 000000000..3a5fb3778 --- /dev/null +++ b/src/libcharon/plugins/socket_dynamic/Makefile.in @@ -0,0 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install-pluginLTLIBRARIES install-ps install-ps-am \ + install-strip installcheck installcheck-am installdirs \ + maintainer-clean maintainer-clean-generic mostlyclean \ + mostlyclean-compile mostlyclean-generic mostlyclean-libtool \ + pdf pdf-am ps ps-am tags uninstall uninstall-am \ + uninstall-pluginLTLIBRARIES + + +# Tell versions [3.59,3.63) of GNU make to not export all variables. +# Otherwise a system limit (for SysV at least) may be exceeded. +.NOEXPORT: diff --git a/src/libcharon/plugins/socket_dynamic/socket_dynamic_plugin.c b/src/libcharon/plugins/socket_dynamic/socket_dynamic_plugin.c new file mode 100644 index 000000000..3410fc7a4 --- /dev/null +++ b/src/libcharon/plugins/socket_dynamic/socket_dynamic_plugin.c @@ -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 *socket_dynamic_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; +} + diff --git a/src/libcharon/plugins/socket_dynamic/socket_dynamic_plugin.h b/src/libcharon/plugins/socket_dynamic/socket_dynamic_plugin.h new file mode 100644 index 000000000..8d870795f --- /dev/null +++ b/src/libcharon/plugins/socket_dynamic/socket_dynamic_plugin.h @@ -0,0 +1,42 @@ +/* + * 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; +}; + +#endif /** SOCKET_DYNAMIC_PLUGIN_H_ @}*/ diff --git a/src/libcharon/plugins/socket_dynamic/socket_dynamic_socket.c b/src/libcharon/plugins/socket_dynamic/socket_dynamic_socket.c new file mode 100644 index 000000000..a7db59ce5 --- /dev/null +++ b/src/libcharon/plugins/socket_dynamic/socket_dynamic_socket.c @@ -0,0 +1,620 @@ +/* + * 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 <threading/rwlock.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; + + /** + * Lock for sockets hashtable + */ + rwlock_t *lock; + + /** + * 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]; + + this->lock->read_lock(this->lock); + 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); + this->lock->unlock(this->lock); + + 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; + + this->lock->read_lock(this->lock); + 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); + this->lock->unlock(this->lock); + + 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) +{ + 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 on each socket */ + if (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; + + this->lock->read_lock(this->lock); + skt = this->sockets->get(this->sockets, &lookup); + this->lock->unlock(this->lock); + if (skt) + { + return skt; + } + fd = open_socket(this, family, port); + if (!fd) + { + return NULL; + } + INIT(skt, + .family = family, + .port = port, + .fd = fd, + ); + this->lock->write_lock(this->lock); + this->sockets->put(this->sockets, skt, skt); + this->lock->unlock(this->lock); + /* 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); + this->lock->destroy(this->lock); + + 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, + }, + .lock = rwlock_create(RWLOCK_TYPE_DEFAULT), + ); + + 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; +} + diff --git a/src/libcharon/plugins/socket_dynamic/socket_dynamic_socket.h b/src/libcharon/plugins/socket_dynamic/socket_dynamic_socket.h new file mode 100644 index 000000000..72551e545 --- /dev/null +++ b/src/libcharon/plugins/socket_dynamic/socket_dynamic_socket.h @@ -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_ @}*/ |