]>
git.saurik.com Git - apple/network_cmds.git/blob - alias/alias_cuseeme.c
2 * Copyright (c) 1998 Brian Somers <brian@Awfulhak.org>
3 * with the aid of code written by
4 * Junichi SATOH <junichi@astec.co.jp> 1996, 1997.
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
28 * $Id: alias_cuseeme.c,v 1.1.1.1 2000/01/11 01:48:42 wsanchez Exp $
31 #include <sys/types.h>
32 #include <netinet/in_systm.h>
33 #include <netinet/in.h>
34 #include <netinet/ip.h>
35 #include <netinet/udp.h>
37 #include "alias_local.h"
39 /* CU-SeeMe Data Header */
41 u_int16_t dest_family
;
53 /* Open Continue Header */
55 u_int16_t client_count
; /* Number of client info structs */
58 char reserved
[4]; /* flags, version stuff, etc */
61 /* client info structures */
63 u_int32_t address
; /* Client address */
64 char reserved
[8]; /* Flags, pruning bitfield, packet counts etc */
68 AliasHandleCUSeeMeOut(struct ip
*pip
, struct alias_link
*link
)
72 ud
= (struct udphdr
*)((char *)pip
+ (pip
->ip_hl
<< 2));
73 if(ud
->uh_ulen
>= sizeof(struct cu_header
)) {
75 struct alias_link
*cu_link
;
77 cu
= (struct cu_header
*)(ud
+ 1);
79 cu
->addr
= (u_int32_t
)GetAliasAddress(link
).s_addr
;
81 cu_link
= FindUdpTcpOut(pip
->ip_src
, GetDestAddress(link
),
82 ud
->uh_dport
, 0, IPPROTO_UDP
);
92 AliasHandleCUSeeMeIn(struct ip
*pip
, struct in_addr original_addr
)
94 struct in_addr alias_addr
;
98 struct client_info
*ci
;
102 alias_addr
.s_addr
= pip
->ip_dst
.s_addr
;
103 ud
= (struct udphdr
*)((char *)pip
+ (pip
->ip_hl
<< 2));
104 cu
= (struct cu_header
*)(ud
+ 1);
105 oc
= (struct oc_header
*)(cu
+ 1);
106 ci
= (struct client_info
*)(oc
+ 1);
107 end
= (char *)cu
+ ud
->uh_ulen
;
109 if ((char *)oc
<= end
) {
111 cu
->dest_addr
= (u_int32_t
)original_addr
.s_addr
;
112 if(ntohs(cu
->data_type
) == 101)
113 /* Find and change our address */
114 for(i
= 0; (char *)(ci
+ 1) <= end
&& i
< oc
->client_count
; i
++, ci
++)
115 if(ci
->address
== (u_int32_t
)alias_addr
.s_addr
) {
116 ci
->address
= (u_int32_t
)original_addr
.s_addr
;