libalias: retire cuseeme support

The CU-SeeMe videoconferencing client and associated protocol is at this
point a historical artifact; there is no need to retain support for this
protocol today.

Reviewed by:	philip, markj, allanjude
Relnotes:	Yes
Sponsored by:	The FreeBSD Foundation
Differential Revision:	https://reviews.freebsd.org/D24790

2 files changed, 0 insertions, 231 deletions

diff --git a/sys/netinet/libalias/alias_cuseeme.c b/sys/netinet/libalias/alias_cuseeme.c
deleted file mode 100644
index 30d453df26ee..000000000000
--- a/sys/netinet/libalias/alias_cuseeme.c
+++ /dev/null
@@ -1,230 +0,0 @@
-/*-
- * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
- *
- * Copyright (c) 1998 Brian Somers <brian@Awfulhak.org>
- *                    with the aid of code written by
- *                    Junichi SATOH <junichi@astec.co.jp> 1996, 1997.
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- *    notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- *    notice, this list of conditions and the following disclaimer in the
- *    documentation and/or other materials provided with the distribution.
- *
- * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- */
-
-#include <sys/cdefs.h>
-__FBSDID("$FreeBSD$");
-
-#ifdef _KERNEL
-#include <sys/param.h>
-#include <sys/kernel.h>
-#include <sys/module.h>
-#else
-#include <errno.h>
-#include <sys/types.h>
-#include <stdio.h>
-#endif
-
-#include <netinet/in_systm.h>
-#include <netinet/in.h>
-#include <netinet/ip.h>
-#include <netinet/udp.h>
-
-#ifdef _KERNEL
-#include <netinet/libalias/alias.h>
-#include <netinet/libalias/alias_local.h>
-#include <netinet/libalias/alias_mod.h>
-#else
-#include "alias_local.h"
-#include "alias_mod.h"
-#endif
-
-#define CUSEEME_PORT_NUMBER 7648
-
-static void
-AliasHandleCUSeeMeOut(struct libalias *la, struct ip *pip,
-		      struct alias_link *lnk);
-
-static void
-AliasHandleCUSeeMeIn(struct libalias *la, struct ip *pip,
-		     struct in_addr original_addr);
-
-static int
-fingerprint(struct libalias *la, struct alias_data *ah)
-{
-
-	if (ah->dport == NULL || ah->oaddr == NULL)
-		return (-1);
-	if (ntohs(*ah->dport) == CUSEEME_PORT_NUMBER)
-		return (0);
-	return (-1);
-}
-
-static int
-protohandlerin(struct libalias *la, struct ip *pip, struct alias_data *ah)
-{
-	
-	AliasHandleCUSeeMeIn(la, pip, *ah->oaddr);
-	return (0);
-}
-
-static int
-protohandlerout(struct libalias *la, struct ip *pip, struct alias_data *ah)
-{
-	
-	AliasHandleCUSeeMeOut(la, pip, ah->lnk);
-	return (0);
-}
-
-/* Kernel module definition. */
-struct proto_handler handlers[] = {
-	{
-	  .pri = 120,
-	  .dir = OUT,
-	  .proto = UDP,
-	  .fingerprint = &fingerprint,
-	  .protohandler = &protohandlerout
-	},
-	{
-	  .pri = 120,
-	  .dir = IN,
-	  .proto = UDP,
-	  .fingerprint = &fingerprint,
-	  .protohandler = &protohandlerin
-	},
-	{ EOH }
-};
-
-static int
-mod_handler(module_t mod, int type, void *data)
-{
-	int error;
-
-	switch (type) {
-	case MOD_LOAD:
-		error = 0;
-		LibAliasAttachHandlers(handlers);
-		break;
-	case MOD_UNLOAD:
-		error = 0;
-		LibAliasDetachHandlers(handlers);
-		break;
-	default:
-		error = EINVAL;
-	}
-	return (error);
-}
-
-#ifdef _KERNEL
-static
-#endif
-moduledata_t
-alias_mod = {
-       "alias_cuseeme", mod_handler, NULL
-};
-
-#ifdef	_KERNEL
-DECLARE_MODULE(alias_cuseeme, alias_mod, SI_SUB_DRIVERS, SI_ORDER_SECOND);
-MODULE_VERSION(alias_cuseeme, 1);
-MODULE_DEPEND(alias_cuseeme, libalias, 1, 1, 1);
-#endif
-
-/* CU-SeeMe Data Header */
-struct cu_header {
-	u_int16_t	dest_family;
-	u_int16_t	dest_port;
-	u_int32_t	dest_addr;
-	int16_t		family;
-	u_int16_t	port;
-	u_int32_t	addr;
-	u_int32_t	seq;
-	u_int16_t	msg;
-	u_int16_t	data_type;
-	u_int16_t	packet_len;
-};
-
-/* Open Continue Header */
-struct oc_header {
-	u_int16_t	client_count;	/* Number of client info structs */
-	u_int32_t	seq_no;
-	char		user_name [20];
-	char		reserved  [4];	/* flags, version stuff, etc */
-};
-
-/* client info structures */
-struct client_info {
-	u_int32_t	address;/* Client address */
-	char		reserved  [8];	/* Flags, pruning bitfield, packet
-					 * counts etc */
-};
-
-static void
-AliasHandleCUSeeMeOut(struct libalias *la, struct ip *pip, struct alias_link *lnk)
-{
-	struct udphdr *ud = ip_next(pip);
-
-	if (ntohs(ud->uh_ulen) - sizeof(struct udphdr) >= sizeof(struct cu_header)) {
-		struct cu_header *cu;
-		struct alias_link *cu_lnk;
-
-		cu = udp_next(ud);
-		if (cu->addr)
-			cu->addr = (u_int32_t) GetAliasAddress(lnk).s_addr;
-
-		cu_lnk = FindUdpTcpOut(la, pip->ip_src, GetDestAddress(lnk),
-		    ud->uh_dport, 0, IPPROTO_UDP, 1);
-
-#ifndef NO_FW_PUNCH
-		if (cu_lnk)
-			PunchFWHole(cu_lnk);
-#endif
-	}
-}
-
-static void
-AliasHandleCUSeeMeIn(struct libalias *la, struct ip *pip, struct in_addr original_addr)
-{
-	struct in_addr alias_addr;
-	struct udphdr *ud;
-	struct cu_header *cu;
-	struct oc_header *oc;
-	struct client_info *ci;
-	char *end;
-	int i;
-
-	(void)la;
-	alias_addr.s_addr = pip->ip_dst.s_addr;
-	ud = ip_next(pip);
-	cu = udp_next(ud);
-	oc = (struct oc_header *)(cu + 1);
-	ci = (struct client_info *)(oc + 1);
-	end = (char *)ud + ntohs(ud->uh_ulen);
-
-	if ((char *)oc <= end) {
-		if (cu->dest_addr)
-			cu->dest_addr = (u_int32_t) original_addr.s_addr;
-		if (ntohs(cu->data_type) == 101)
-			/* Find and change our address */
-			for (i = 0; (char *)(ci + 1) <= end && i < oc->client_count; i++, ci++)
-				if (ci->address == (u_int32_t) alias_addr.s_addr) {
-					ci->address = (u_int32_t) original_addr.s_addr;
-					break;
-				}
-	}
-}
diff --git a/sys/netinet/libalias/libalias.3 b/sys/netinet/libalias/libalias.3
index fe85730f095d..c323edf4c499 100644
--- a/sys/netinet/libalias/libalias.3
+++ b/sys/netinet/libalias/libalias.3
@@ -1051,7 +1051,6 @@ There is a configuration file,
 .Pa /etc/libalias.conf ,
 with the following contents (by default):
 .Bd -literal -offset indent
-/usr/lib/libalias_cuseeme.so
 /usr/lib/libalias_ftp.so
 /usr/lib/libalias_irc.so
 /usr/lib/libalias_nbt.so