685 lines
15 KiB
C
685 lines
15 KiB
C
/*
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* Copyright (C) 2006-2013 Tobias Brunner
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* Copyright (C) 2006 Daniel Roethlisberger
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* Copyright (C) 2005-2010 Martin Willi
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* Copyright (C) 2005 Jan Hutter
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* Hochschule fuer Technik Rapperswil
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* Copyright (C) 2010 revosec AG
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* for more details.
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*/
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/* for struct in6_pktinfo */
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#define _GNU_SOURCE
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#include "socket_dynamic_socket.h"
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <string.h>
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#include <errno.h>
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#include <unistd.h>
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#include <stdlib.h>
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#include <fcntl.h>
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#include <sys/ioctl.h>
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#include <netinet/in_systm.h>
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#include <netinet/in.h>
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#include <netinet/ip.h>
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#include <netinet/udp.h>
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#include <net/if.h>
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#include <hydra.h>
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#include <daemon.h>
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#include <threading/thread.h>
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#include <threading/rwlock.h>
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#include <collections/hashtable.h>
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/* Maximum size of a packet */
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#define MAX_PACKET 10000
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/* these are not defined on some platforms */
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#ifndef SOL_IP
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#define SOL_IP IPPROTO_IP
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#endif
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#ifndef SOL_IPV6
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#define SOL_IPV6 IPPROTO_IPV6
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#endif
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/* IPV6_RECVPKTINFO is defined in RFC 3542 which obsoletes RFC 2292 that
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* previously defined IPV6_PKTINFO */
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#ifndef IPV6_RECVPKTINFO
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#define IPV6_RECVPKTINFO IPV6_PKTINFO
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#endif
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typedef struct private_socket_dynamic_socket_t private_socket_dynamic_socket_t;
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typedef struct dynsock_t dynsock_t;
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/**
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* Private data of an socket_t object
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*/
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struct private_socket_dynamic_socket_t {
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/**
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* public functions
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*/
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socket_dynamic_socket_t public;
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/**
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* Hashtable of bound sockets
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*/
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hashtable_t *sockets;
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/**
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* Lock for sockets hashtable
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*/
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rwlock_t *lock;
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/**
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* Notification pipe to signal receiver
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*/
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int notify[2];
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/**
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* Maximum packet size to receive
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*/
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int max_packet;
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};
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/**
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* Struct for a dynamically allocated socket
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*/
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struct dynsock_t {
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/**
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* File descriptor of socket
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*/
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int fd;
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/**
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* Address family
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*/
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int family;
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/**
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* Bound source port
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*/
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u_int16_t port;
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};
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/**
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* Hash function for hashtable
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*/
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static u_int hash(dynsock_t *key)
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{
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return (key->family << 16) | key->port;
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}
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/**
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* Equals function for hashtable
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*/
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static bool equals(dynsock_t *a, dynsock_t *b)
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{
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return a->family == b->family && a->port == b->port;
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}
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/**
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* Create a fd_set from all bound sockets
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*/
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static int build_fds(private_socket_dynamic_socket_t *this, fd_set *fds)
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{
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enumerator_t *enumerator;
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dynsock_t *key, *value;
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int maxfd;
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FD_ZERO(fds);
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FD_SET(this->notify[0], fds);
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maxfd = this->notify[0];
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this->lock->read_lock(this->lock);
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enumerator = this->sockets->create_enumerator(this->sockets);
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while (enumerator->enumerate(enumerator, &key, &value))
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{
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FD_SET(value->fd, fds);
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maxfd = max(maxfd, value->fd);
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}
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enumerator->destroy(enumerator);
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this->lock->unlock(this->lock);
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return maxfd + 1;
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}
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/**
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* Find the socket select()ed
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*/
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static dynsock_t* scan_fds(private_socket_dynamic_socket_t *this, fd_set *fds)
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{
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enumerator_t *enumerator;
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dynsock_t *key, *value, *selected = NULL;
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this->lock->read_lock(this->lock);
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enumerator = this->sockets->create_enumerator(this->sockets);
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while (enumerator->enumerate(enumerator, &key, &value))
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{
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if (FD_ISSET(value->fd, fds))
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{
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selected = value;
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break;
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}
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}
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enumerator->destroy(enumerator);
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this->lock->unlock(this->lock);
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return selected;
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}
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/**
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* Receive a packet from a given socket fd
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*/
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static packet_t *receive_packet(private_socket_dynamic_socket_t *this,
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dynsock_t *skt)
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{
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host_t *source = NULL, *dest = NULL;
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ssize_t len;
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char buffer[this->max_packet];
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chunk_t data;
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packet_t *packet;
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struct msghdr msg;
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struct cmsghdr *cmsgptr;
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struct iovec iov;
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char ancillary[64];
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union {
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struct sockaddr_in in4;
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struct sockaddr_in6 in6;
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} src;
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msg.msg_name = &src;
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msg.msg_namelen = sizeof(src);
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iov.iov_base = buffer;
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iov.iov_len = this->max_packet;
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msg.msg_iov = &iov;
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msg.msg_iovlen = 1;
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msg.msg_control = ancillary;
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msg.msg_controllen = sizeof(ancillary);
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msg.msg_flags = 0;
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len = recvmsg(skt->fd, &msg, 0);
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if (len < 0)
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{
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DBG1(DBG_NET, "error reading socket: %s", strerror(errno));
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return NULL;
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}
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if (msg.msg_flags & MSG_TRUNC)
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{
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DBG1(DBG_NET, "receive buffer too small, packet discarded");
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return NULL;
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}
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DBG3(DBG_NET, "received packet %b", buffer, (u_int)len);
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/* read ancillary data to get destination address */
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for (cmsgptr = CMSG_FIRSTHDR(&msg); cmsgptr != NULL;
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cmsgptr = CMSG_NXTHDR(&msg, cmsgptr))
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{
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if (cmsgptr->cmsg_len == 0)
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{
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DBG1(DBG_NET, "error reading ancillary data");
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return NULL;
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}
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if (cmsgptr->cmsg_level == SOL_IPV6 &&
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cmsgptr->cmsg_type == IPV6_PKTINFO)
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{
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struct in6_pktinfo *pktinfo;
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struct sockaddr_in6 dst;
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pktinfo = (struct in6_pktinfo*)CMSG_DATA(cmsgptr);
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memset(&dst, 0, sizeof(dst));
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memcpy(&dst.sin6_addr, &pktinfo->ipi6_addr, sizeof(dst.sin6_addr));
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dst.sin6_family = AF_INET6;
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dst.sin6_port = htons(skt->port);
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dest = host_create_from_sockaddr((sockaddr_t*)&dst);
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}
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if (cmsgptr->cmsg_level == SOL_IP &&
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cmsgptr->cmsg_type == IP_PKTINFO)
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{
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struct in_pktinfo *pktinfo;
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struct sockaddr_in dst;
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pktinfo = (struct in_pktinfo*)CMSG_DATA(cmsgptr);
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memset(&dst, 0, sizeof(dst));
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memcpy(&dst.sin_addr, &pktinfo->ipi_addr, sizeof(dst.sin_addr));
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dst.sin_family = AF_INET;
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dst.sin_port = htons(skt->port);
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dest = host_create_from_sockaddr((sockaddr_t*)&dst);
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}
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if (dest)
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{
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break;
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}
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}
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if (dest == NULL)
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{
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DBG1(DBG_NET, "error reading IP header");
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return NULL;
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}
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source = host_create_from_sockaddr((sockaddr_t*)&src);
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DBG2(DBG_NET, "received packet: from %#H to %#H", source, dest);
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data = chunk_create(buffer, len);
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packet = packet_create();
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packet->set_source(packet, source);
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packet->set_destination(packet, dest);
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packet->set_data(packet, chunk_clone(data));
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return packet;
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}
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METHOD(socket_t, receiver, status_t,
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private_socket_dynamic_socket_t *this, packet_t **packet)
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{
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dynsock_t *selected;
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packet_t *pkt;
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bool oldstate;
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fd_set fds;
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int maxfd;
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while (TRUE)
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{
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maxfd = build_fds(this, &fds);
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DBG2(DBG_NET, "waiting for data on sockets");
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oldstate = thread_cancelability(TRUE);
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if (select(maxfd, &fds, NULL, NULL, NULL) <= 0)
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{
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thread_cancelability(oldstate);
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return FAILED;
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}
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thread_cancelability(oldstate);
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if (FD_ISSET(this->notify[0], &fds))
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{ /* got notified, read garbage, rebuild fdset */
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char buf[1];
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ignore_result(read(this->notify[0], buf, sizeof(buf)));
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DBG2(DBG_NET, "rebuilding fdset due to newly bound ports");
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continue;
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}
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selected = scan_fds(this, &fds);
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if (selected)
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{
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break;
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}
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}
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pkt = receive_packet(this, selected);
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if (pkt)
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{
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*packet = pkt;
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return SUCCESS;
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}
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return FAILED;
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}
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/**
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* Get the port allocated dynamically using bind()
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*/
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static bool get_dynamic_port(int fd, int family, u_int16_t *port)
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{
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union {
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struct sockaddr_storage ss;
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struct sockaddr s;
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struct sockaddr_in sin;
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struct sockaddr_in6 sin6;
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} addr;
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socklen_t addrlen;
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addrlen = sizeof(addr);
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if (getsockname(fd, &addr.s, &addrlen) != 0)
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{
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DBG1(DBG_NET, "unable to getsockname: %s", strerror(errno));
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return FALSE;
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}
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switch (family)
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{
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case AF_INET:
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if (addrlen != sizeof(addr.sin) || addr.sin.sin_family != family)
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{
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break;
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}
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*port = ntohs(addr.sin.sin_port);
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return TRUE;
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case AF_INET6:
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if (addrlen != sizeof(addr.sin6) || addr.sin6.sin6_family != family)
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{
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break;
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}
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*port = ntohs(addr.sin6.sin6_port);
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return TRUE;
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default:
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return FALSE;
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}
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DBG1(DBG_NET, "received invalid getsockname() result");
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return FALSE;
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}
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/**
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* open a socket to send and receive packets
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*/
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static int open_socket(private_socket_dynamic_socket_t *this,
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int family, u_int16_t *port)
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{
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union {
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struct sockaddr_storage ss;
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struct sockaddr s;
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struct sockaddr_in sin;
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struct sockaddr_in6 sin6;
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} addr;
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int on = TRUE;
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socklen_t addrlen;
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u_int sol, pktinfo = 0;
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int fd;
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memset(&addr, 0, sizeof(addr));
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/* precalculate constants depending on address family */
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switch (family)
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{
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case AF_INET:
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addr.sin.sin_family = AF_INET;
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addr.sin.sin_addr.s_addr = INADDR_ANY;
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addr.sin.sin_port = htons(*port);
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addrlen = sizeof(addr.sin);
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sol = SOL_IP;
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pktinfo = IP_PKTINFO;
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break;
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case AF_INET6:
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addr.sin6.sin6_family = AF_INET6;
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memset(&addr.sin6.sin6_addr, 0, sizeof(addr.sin6.sin6_addr));
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addr.sin6.sin6_port = htons(*port);
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addrlen = sizeof(addr.sin6);
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sol = SOL_IPV6;
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pktinfo = IPV6_RECVPKTINFO;
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break;
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default:
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return 0;
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}
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fd = socket(family, SOCK_DGRAM, IPPROTO_UDP);
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if (fd < 0)
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{
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DBG1(DBG_NET, "could not open socket: %s", strerror(errno));
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return 0;
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}
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if (setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, (void*)&on, sizeof(on)) < 0)
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{
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DBG1(DBG_NET, "unable to set SO_REUSEADDR on socket: %s", strerror(errno));
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close(fd);
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return 0;
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}
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if (bind(fd, &addr.s, addrlen) < 0)
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{
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DBG1(DBG_NET, "unable to bind socket: %s", strerror(errno));
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close(fd);
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return 0;
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}
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if (*port == 0 && !get_dynamic_port(fd, family, port))
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{
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close(fd);
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return 0;
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}
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/* get additional packet info on receive */
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if (setsockopt(fd, sol, pktinfo, &on, sizeof(on)) < 0)
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{
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DBG1(DBG_NET, "unable to set IP_PKTINFO on socket: %s", strerror(errno));
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close(fd);
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return 0;
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}
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if (!hydra->kernel_interface->bypass_socket(hydra->kernel_interface,
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fd, family))
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{
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DBG1(DBG_NET, "installing IKE bypass policy failed");
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}
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/* enable UDP decapsulation on each socket */
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if (!hydra->kernel_interface->enable_udp_decap(hydra->kernel_interface,
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fd, family, *port))
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{
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DBG1(DBG_NET, "enabling UDP decapsulation for %s on port %d failed",
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family == AF_INET ? "IPv4" : "IPv6", *port);
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}
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return fd;
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}
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/**
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* Get the first usable socket for an address family
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*/
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static dynsock_t *get_any_socket(private_socket_dynamic_socket_t *this,
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int family)
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{
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dynsock_t *key, *value, *found = NULL;
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enumerator_t *enumerator;
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this->lock->read_lock(this->lock);
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enumerator = this->sockets->create_enumerator(this->sockets);
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while (enumerator->enumerate(enumerator, &key, &value))
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{
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if (value->family == family)
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{
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found = value;
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break;
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}
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}
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enumerator->destroy(enumerator);
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this->lock->unlock(this->lock);
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return found;
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}
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/**
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* Find/Create a socket to send from host
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*/
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static dynsock_t *find_socket(private_socket_dynamic_socket_t *this,
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int family, u_int16_t port)
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{
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dynsock_t *skt, lookup = {
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.family = family,
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.port = port,
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};
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char buf[] = {0x01};
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int fd;
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this->lock->read_lock(this->lock);
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skt = this->sockets->get(this->sockets, &lookup);
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this->lock->unlock(this->lock);
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if (skt)
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{
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return skt;
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}
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if (!port)
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{
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skt = get_any_socket(this, family);
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if (skt)
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{
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return skt;
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}
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}
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fd = open_socket(this, family, &port);
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if (!fd)
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{
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return NULL;
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}
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INIT(skt,
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.family = family,
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.port = port,
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.fd = fd,
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);
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this->lock->write_lock(this->lock);
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this->sockets->put(this->sockets, skt, skt);
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this->lock->unlock(this->lock);
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/* notify receiver thread to reread socket list */
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ignore_result(write(this->notify[1], buf, sizeof(buf)));
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return skt;
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}
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METHOD(socket_t, sender, status_t,
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private_socket_dynamic_socket_t *this, packet_t *packet)
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{
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dynsock_t *skt;
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host_t *src, *dst;
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int family;
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ssize_t len;
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chunk_t data;
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struct msghdr msg;
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struct cmsghdr *cmsg;
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struct iovec iov;
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src = packet->get_source(packet);
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dst = packet->get_destination(packet);
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family = src->get_family(src);
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skt = find_socket(this, family, src->get_port(src));
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if (!skt)
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{
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return FAILED;
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}
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data = packet->get_data(packet);
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DBG2(DBG_NET, "sending packet: from %#H to %#H", src, dst);
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|
|
|
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;
|
|
|
|
memset(buf, 0, sizeof(buf));
|
|
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);
|
|
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;
|
|
|
|
memset(buf, 0, sizeof(buf));
|
|
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);
|
|
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_t, get_port, u_int16_t,
|
|
private_socket_dynamic_socket_t *this, bool nat_t)
|
|
{
|
|
/* we return 0 here for users that have no explicit port configured, the
|
|
* sender will default to the default port in this case */
|
|
return 0;
|
|
}
|
|
|
|
METHOD(socket_t, supported_families, socket_family_t,
|
|
private_socket_dynamic_socket_t *this)
|
|
{
|
|
/* we could return only the families of the opened sockets, but it could
|
|
* be that both families are supported even if no socket is yet open */
|
|
return SOCKET_FAMILY_BOTH;
|
|
}
|
|
|
|
METHOD(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,
|
|
.get_port = _get_port,
|
|
.supported_families = _supported_families,
|
|
.destroy = _destroy,
|
|
},
|
|
},
|
|
.lock = rwlock_create(RWLOCK_TYPE_DEFAULT),
|
|
.max_packet = lib->settings->get_int(lib->settings,
|
|
"%s.max_packet", MAX_PACKET, lib->ns),
|
|
);
|
|
|
|
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;
|
|
}
|