ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync/*-
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync * Copyright (c) 1998 Brian Somers <brian@Awfulhak.org>
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync * with the aid of code written by
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync * Junichi SATOH <junichi@astec.co.jp> 1996, 1997.
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync * All rights reserved.
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync *
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync * Redistribution and use in source and binary forms, with or without
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync * modification, are permitted provided that the following conditions
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync * are met:
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync * 1. Redistributions of source code must retain the above copyright
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync * notice, this list of conditions and the following disclaimer.
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync * 2. Redistributions in binary form must reproduce the above copyright
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync * notice, this list of conditions and the following disclaimer in the
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync * documentation and/or other materials provided with the distribution.
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync *
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync * SUCH DAMAGE.
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync */
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync#include <sys/cdefs.h>
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync__FBSDID("$FreeBSD: src/sys/netinet/libalias/alias_cuseeme.c,v 1.13.8.1 2009/04/15 03:14:26 kensmith Exp $");
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync#ifdef _KERNEL
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync#include <sys/param.h>
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync#include <sys/kernel.h>
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync#include <sys/module.h>
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync#else
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync#include <errno.h>
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync#include <sys/types.h>
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync#include <stdio.h>
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync#endif
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync#include <netinet/in_systm.h>
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync#include <netinet/in.h>
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync#include <netinet/ip.h>
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync#include <netinet/udp.h>
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync#ifdef _KERNEL
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync#include <netinet/libalias/alias.h>
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync#include <netinet/libalias/alias_local.h>
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync#include <netinet/libalias/alias_mod.h>
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync#else
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync#include "alias_local.h"
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync#include "alias_mod.h"
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync#endif
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync#define CUSEEME_PORT_NUMBER 7648
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsyncstatic void
5045ab9ca39fa0b301f4020b7a072406eb0ecea2vboxsyncAliasHandleCUSeeMeOut(struct libalias *la, struct ip *pip,
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync struct alias_link *lnk);
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsyncstatic void
5045ab9ca39fa0b301f4020b7a072406eb0ecea2vboxsyncAliasHandleCUSeeMeIn(struct libalias *la, struct ip *pip,
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync struct in_addr original_addr);
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync
5045ab9ca39fa0b301f4020b7a072406eb0ecea2vboxsyncstatic int
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsyncfingerprint(struct libalias *la, struct ip *pip, struct alias_data *ah)
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync{
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync if (ah->dport == NULL || ah->oaddr == NULL)
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync return (-1);
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync if (ntohs(*ah->dport) == CUSEEME_PORT_NUMBER)
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync return (0);
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync return (-1);
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync}
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync
5045ab9ca39fa0b301f4020b7a072406eb0ecea2vboxsyncstatic int
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsyncprotohandlerin(struct libalias *la, struct ip *pip, struct alias_data *ah)
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync{
5045ab9ca39fa0b301f4020b7a072406eb0ecea2vboxsync
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync AliasHandleCUSeeMeIn(la, pip, *ah->oaddr);
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync return (0);
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync}
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync
5045ab9ca39fa0b301f4020b7a072406eb0ecea2vboxsyncstatic int
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsyncprotohandlerout(struct libalias *la, struct ip *pip, struct alias_data *ah)
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync{
5045ab9ca39fa0b301f4020b7a072406eb0ecea2vboxsync
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync AliasHandleCUSeeMeOut(la, pip, ah->lnk);
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync return (0);
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync}
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync/* Kernel module definition. */
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsyncstruct proto_handler handlers[] = {
5045ab9ca39fa0b301f4020b7a072406eb0ecea2vboxsync {
5045ab9ca39fa0b301f4020b7a072406eb0ecea2vboxsync .pri = 120,
5045ab9ca39fa0b301f4020b7a072406eb0ecea2vboxsync .dir = OUT,
5045ab9ca39fa0b301f4020b7a072406eb0ecea2vboxsync .proto = UDP,
5045ab9ca39fa0b301f4020b7a072406eb0ecea2vboxsync .fingerprint = &fingerprint,
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync .protohandler = &protohandlerout
5045ab9ca39fa0b301f4020b7a072406eb0ecea2vboxsync },
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync {
5045ab9ca39fa0b301f4020b7a072406eb0ecea2vboxsync .pri = 120,
5045ab9ca39fa0b301f4020b7a072406eb0ecea2vboxsync .dir = IN,
5045ab9ca39fa0b301f4020b7a072406eb0ecea2vboxsync .proto = UDP,
5045ab9ca39fa0b301f4020b7a072406eb0ecea2vboxsync .fingerprint = &fingerprint,
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync .protohandler = &protohandlerin
5045ab9ca39fa0b301f4020b7a072406eb0ecea2vboxsync },
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync { EOH }
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync};
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsyncstatic int
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsyncmod_handler(module_t mod, int type, void *data)
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync{
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync int error;
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync switch (type) {
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync case MOD_LOAD:
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync error = 0;
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync LibAliasAttachHandlers(handlers);
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync break;
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync case MOD_UNLOAD:
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync error = 0;
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync LibAliasDetachHandlers(handlers);
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync break;
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync default:
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync error = EINVAL;
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync }
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync return (error);
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync}
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync#ifdef _KERNEL
5045ab9ca39fa0b301f4020b7a072406eb0ecea2vboxsyncstatic
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync#endif
5045ab9ca39fa0b301f4020b7a072406eb0ecea2vboxsyncmoduledata_t
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsyncalias_mod = {
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync "alias_cuseeme", mod_handler, NULL
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync};
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync#ifdef _KERNEL
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsyncDECLARE_MODULE(alias_cuseeme, alias_mod, SI_SUB_DRIVERS, SI_ORDER_SECOND);
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsyncMODULE_VERSION(alias_cuseeme, 1);
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsyncMODULE_DEPEND(alias_cuseeme, libalias, 1, 1, 1);
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync#endif
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync/* CU-SeeMe Data Header */
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsyncstruct cu_header {
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync u_int16_t dest_family;
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync u_int16_t dest_port;
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync u_int32_t dest_addr;
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync int16_t family;
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync u_int16_t port;
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync u_int32_t addr;
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync u_int32_t seq;
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync u_int16_t msg;
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync u_int16_t data_type;
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync u_int16_t packet_len;
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync};
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync/* Open Continue Header */
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsyncstruct oc_header {
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync u_int16_t client_count; /* Number of client info structs */
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync u_int32_t seq_no;
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync char user_name [20];
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync char reserved [4]; /* flags, version stuff, etc */
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync};
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync/* client info structures */
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsyncstruct client_info {
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync u_int32_t address;/* Client address */
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync char reserved [8]; /* Flags, pruning bitfield, packet
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync * counts etc */
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync};
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsyncstatic void
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsyncAliasHandleCUSeeMeOut(struct libalias *la, struct ip *pip, struct alias_link *lnk)
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync{
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync struct udphdr *ud = ip_next(pip);
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync if (ntohs(ud->uh_ulen) - sizeof(struct udphdr) >= sizeof(struct cu_header)) {
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync struct cu_header *cu;
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync struct alias_link *cu_lnk;
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync cu = udp_next(ud);
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync if (cu->addr)
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync cu->addr = (u_int32_t) GetAliasAddress(lnk).s_addr;
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync cu_lnk = FindUdpTcpOut(la, pip->ip_src, GetDestAddress(lnk),
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync ud->uh_dport, 0, IPPROTO_UDP, 1);
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync#ifndef NO_FW_PUNCH
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync if (cu_lnk)
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync PunchFWHole(cu_lnk);
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync#endif
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync }
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync}
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsyncstatic void
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsyncAliasHandleCUSeeMeIn(struct libalias *la, struct ip *pip, struct in_addr original_addr)
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync{
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync struct in_addr alias_addr;
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync struct udphdr *ud;
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync struct cu_header *cu;
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync struct oc_header *oc;
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync struct client_info *ci;
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync char *end;
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync int i;
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync (void)la;
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync alias_addr.s_addr = pip->ip_dst.s_addr;
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync ud = ip_next(pip);
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync cu = udp_next(ud);
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync oc = (struct oc_header *)(cu + 1);
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync ci = (struct client_info *)(oc + 1);
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync end = (char *)ud + ntohs(ud->uh_ulen);
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync if ((char *)oc <= end) {
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync if (cu->dest_addr)
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync cu->dest_addr = (u_int32_t) original_addr.s_addr;
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync if (ntohs(cu->data_type) == 101)
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync /* Find and change our address */
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync for (i = 0; (char *)(ci + 1) <= end && i < oc->client_count; i++, ci++)
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync if (ci->address == (u_int32_t) alias_addr.s_addr) {
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync ci->address = (u_int32_t) original_addr.s_addr;
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync break;
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync }
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync }
ae9ed83297460a052aeae98394d473e83aeafd1fvboxsync}