1/*-
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.
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
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.
15 *
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
26 * SUCH DAMAGE.
27 */
28
29#include <sys/cdefs.h>
| 1/*-
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.
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
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.
15 *
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
26 * SUCH DAMAGE.
27 */
28
29#include <sys/cdefs.h>
|
30__FBSDID("$FreeBSD: head/sys/netinet/libalias/alias_cuseeme.c 190841 2009-04-08 11:56:49Z piso $");
| 30__FBSDID("$FreeBSD: head/sys/netinet/libalias/alias_cuseeme.c 259858 2013-12-25 02:06:57Z glebius $");
|
31
32#ifdef _KERNEL
33#include <sys/param.h>
34#include <sys/kernel.h>
35#include <sys/module.h>
36#else
37#include <errno.h>
38#include <sys/types.h>
39#include <stdio.h>
40#endif
41
42#include <netinet/in_systm.h>
43#include <netinet/in.h>
44#include <netinet/ip.h>
45#include <netinet/udp.h>
46
47#ifdef _KERNEL
48#include <netinet/libalias/alias.h>
49#include <netinet/libalias/alias_local.h>
50#include <netinet/libalias/alias_mod.h>
51#else
52#include "alias_local.h"
53#include "alias_mod.h"
54#endif
55
56#define CUSEEME_PORT_NUMBER 7648
57
58static void
| 31
32#ifdef _KERNEL
33#include <sys/param.h>
34#include <sys/kernel.h>
35#include <sys/module.h>
36#else
37#include <errno.h>
38#include <sys/types.h>
39#include <stdio.h>
40#endif
41
42#include <netinet/in_systm.h>
43#include <netinet/in.h>
44#include <netinet/ip.h>
45#include <netinet/udp.h>
46
47#ifdef _KERNEL
48#include <netinet/libalias/alias.h>
49#include <netinet/libalias/alias_local.h>
50#include <netinet/libalias/alias_mod.h>
51#else
52#include "alias_local.h"
53#include "alias_mod.h"
54#endif
55
56#define CUSEEME_PORT_NUMBER 7648
57
58static void
|
59AliasHandleCUSeeMeOut(struct libalias *la, struct ip *pip,
| 59AliasHandleCUSeeMeOut(struct libalias *la, struct ip *pip,
|
60 struct alias_link *lnk);
61
62static void
| 60 struct alias_link *lnk);
61
62static void
|
63AliasHandleCUSeeMeIn(struct libalias *la, struct ip *pip,
| 63AliasHandleCUSeeMeIn(struct libalias *la, struct ip *pip,
|
64 struct in_addr original_addr);
65
| 64 struct in_addr original_addr);
65
|
66static int
| 66static int
|
67fingerprint(struct libalias *la, struct alias_data *ah)
68{
69
70 if (ah->dport == NULL || ah->oaddr == NULL)
71 return (-1);
72 if (ntohs(*ah->dport) == CUSEEME_PORT_NUMBER)
73 return (0);
74 return (-1);
75}
76
| 67fingerprint(struct libalias *la, struct alias_data *ah)
68{
69
70 if (ah->dport == NULL || ah->oaddr == NULL)
71 return (-1);
72 if (ntohs(*ah->dport) == CUSEEME_PORT_NUMBER)
73 return (0);
74 return (-1);
75}
76
|
77static int
| 77static int
|
78protohandlerin(struct libalias *la, struct ip *pip, struct alias_data *ah)
79{
80
81 AliasHandleCUSeeMeIn(la, pip, *ah->oaddr);
82 return (0);
83}
84
| 78protohandlerin(struct libalias *la, struct ip *pip, struct alias_data *ah)
79{
80
81 AliasHandleCUSeeMeIn(la, pip, *ah->oaddr);
82 return (0);
83}
84
|
85static int
| 85static int
|
86protohandlerout(struct libalias *la, struct ip *pip, struct alias_data *ah)
87{
88
89 AliasHandleCUSeeMeOut(la, pip, ah->lnk);
90 return (0);
91}
92
93/* Kernel module definition. */
94struct proto_handler handlers[] = {
| 86protohandlerout(struct libalias *la, struct ip *pip, struct alias_data *ah)
87{
88
89 AliasHandleCUSeeMeOut(la, pip, ah->lnk);
90 return (0);
91}
92
93/* Kernel module definition. */
94struct proto_handler handlers[] = {
|
95 {
96 .pri = 120,
97 .dir = OUT,
98 .proto = UDP,
99 .fingerprint = &fingerprint,
| 95 {
96 .pri = 120,
97 .dir = OUT,
98 .proto = UDP,
99 .fingerprint = &fingerprint,
|
100 .protohandler = &protohandlerout
| 100 .protohandler = &protohandlerout
|
101 },
| 101 },
|
102 {
| 102 {
|
103 .pri = 120,
104 .dir = IN,
105 .proto = UDP,
106 .fingerprint = &fingerprint,
| 103 .pri = 120,
104 .dir = IN,
105 .proto = UDP,
106 .fingerprint = &fingerprint,
|
107 .protohandler = &protohandlerin
| 107 .protohandler = &protohandlerin
|
108 },
| 108 },
|
109 { EOH }
110};
111
112static int
113mod_handler(module_t mod, int type, void *data)
114{
115 int error;
116
117 switch (type) {
118 case MOD_LOAD:
119 error = 0;
120 LibAliasAttachHandlers(handlers);
121 break;
122 case MOD_UNLOAD:
123 error = 0;
124 LibAliasDetachHandlers(handlers);
125 break;
126 default:
127 error = EINVAL;
128 }
129 return (error);
130}
131
132#ifdef _KERNEL
| 109 { EOH }
110};
111
112static int
113mod_handler(module_t mod, int type, void *data)
114{
115 int error;
116
117 switch (type) {
118 case MOD_LOAD:
119 error = 0;
120 LibAliasAttachHandlers(handlers);
121 break;
122 case MOD_UNLOAD:
123 error = 0;
124 LibAliasDetachHandlers(handlers);
125 break;
126 default:
127 error = EINVAL;
128 }
129 return (error);
130}
131
132#ifdef _KERNEL
|
133static
| 133static
|
134#endif
| 134#endif
|
135moduledata_t
| 135moduledata_t
|
136alias_mod = {
137 "alias_cuseeme", mod_handler, NULL
138};
139
140#ifdef _KERNEL
141DECLARE_MODULE(alias_cuseeme, alias_mod, SI_SUB_DRIVERS, SI_ORDER_SECOND);
142MODULE_VERSION(alias_cuseeme, 1);
143MODULE_DEPEND(alias_cuseeme, libalias, 1, 1, 1);
144#endif
145
146/* CU-SeeMe Data Header */
147struct cu_header {
148 u_int16_t dest_family;
149 u_int16_t dest_port;
150 u_int32_t dest_addr;
151 int16_t family;
152 u_int16_t port;
153 u_int32_t addr;
154 u_int32_t seq;
155 u_int16_t msg;
156 u_int16_t data_type;
157 u_int16_t packet_len;
158};
159
160/* Open Continue Header */
161struct oc_header {
162 u_int16_t client_count; /* Number of client info structs */
163 u_int32_t seq_no;
164 char user_name [20];
165 char reserved [4]; /* flags, version stuff, etc */
166};
167
168/* client info structures */
169struct client_info {
170 u_int32_t address;/* Client address */
171 char reserved [8]; /* Flags, pruning bitfield, packet
172 * counts etc */
173};
174
175static void
176AliasHandleCUSeeMeOut(struct libalias *la, struct ip *pip, struct alias_link *lnk)
177{
178 struct udphdr *ud = ip_next(pip);
179
180 if (ntohs(ud->uh_ulen) - sizeof(struct udphdr) >= sizeof(struct cu_header)) {
181 struct cu_header *cu;
182 struct alias_link *cu_lnk;
183
184 cu = udp_next(ud);
185 if (cu->addr)
186 cu->addr = (u_int32_t) GetAliasAddress(lnk).s_addr;
187
188 cu_lnk = FindUdpTcpOut(la, pip->ip_src, GetDestAddress(lnk),
189 ud->uh_dport, 0, IPPROTO_UDP, 1);
190
191#ifndef NO_FW_PUNCH
192 if (cu_lnk)
193 PunchFWHole(cu_lnk);
194#endif
195 }
196}
197
198static void
199AliasHandleCUSeeMeIn(struct libalias *la, struct ip *pip, struct in_addr original_addr)
200{
201 struct in_addr alias_addr;
202 struct udphdr *ud;
203 struct cu_header *cu;
204 struct oc_header *oc;
205 struct client_info *ci;
206 char *end;
207 int i;
208
209 (void)la;
210 alias_addr.s_addr = pip->ip_dst.s_addr;
211 ud = ip_next(pip);
212 cu = udp_next(ud);
213 oc = (struct oc_header *)(cu + 1);
214 ci = (struct client_info *)(oc + 1);
215 end = (char *)ud + ntohs(ud->uh_ulen);
216
217 if ((char *)oc <= end) {
218 if (cu->dest_addr)
219 cu->dest_addr = (u_int32_t) original_addr.s_addr;
220 if (ntohs(cu->data_type) == 101)
221 /* Find and change our address */
222 for (i = 0; (char *)(ci + 1) <= end && i < oc->client_count; i++, ci++)
223 if (ci->address == (u_int32_t) alias_addr.s_addr) {
224 ci->address = (u_int32_t) original_addr.s_addr;
225 break;
226 }
227 }
228}
| 136alias_mod = {
137 "alias_cuseeme", mod_handler, NULL
138};
139
140#ifdef _KERNEL
141DECLARE_MODULE(alias_cuseeme, alias_mod, SI_SUB_DRIVERS, SI_ORDER_SECOND);
142MODULE_VERSION(alias_cuseeme, 1);
143MODULE_DEPEND(alias_cuseeme, libalias, 1, 1, 1);
144#endif
145
146/* CU-SeeMe Data Header */
147struct cu_header {
148 u_int16_t dest_family;
149 u_int16_t dest_port;
150 u_int32_t dest_addr;
151 int16_t family;
152 u_int16_t port;
153 u_int32_t addr;
154 u_int32_t seq;
155 u_int16_t msg;
156 u_int16_t data_type;
157 u_int16_t packet_len;
158};
159
160/* Open Continue Header */
161struct oc_header {
162 u_int16_t client_count; /* Number of client info structs */
163 u_int32_t seq_no;
164 char user_name [20];
165 char reserved [4]; /* flags, version stuff, etc */
166};
167
168/* client info structures */
169struct client_info {
170 u_int32_t address;/* Client address */
171 char reserved [8]; /* Flags, pruning bitfield, packet
172 * counts etc */
173};
174
175static void
176AliasHandleCUSeeMeOut(struct libalias *la, struct ip *pip, struct alias_link *lnk)
177{
178 struct udphdr *ud = ip_next(pip);
179
180 if (ntohs(ud->uh_ulen) - sizeof(struct udphdr) >= sizeof(struct cu_header)) {
181 struct cu_header *cu;
182 struct alias_link *cu_lnk;
183
184 cu = udp_next(ud);
185 if (cu->addr)
186 cu->addr = (u_int32_t) GetAliasAddress(lnk).s_addr;
187
188 cu_lnk = FindUdpTcpOut(la, pip->ip_src, GetDestAddress(lnk),
189 ud->uh_dport, 0, IPPROTO_UDP, 1);
190
191#ifndef NO_FW_PUNCH
192 if (cu_lnk)
193 PunchFWHole(cu_lnk);
194#endif
195 }
196}
197
198static void
199AliasHandleCUSeeMeIn(struct libalias *la, struct ip *pip, struct in_addr original_addr)
200{
201 struct in_addr alias_addr;
202 struct udphdr *ud;
203 struct cu_header *cu;
204 struct oc_header *oc;
205 struct client_info *ci;
206 char *end;
207 int i;
208
209 (void)la;
210 alias_addr.s_addr = pip->ip_dst.s_addr;
211 ud = ip_next(pip);
212 cu = udp_next(ud);
213 oc = (struct oc_header *)(cu + 1);
214 ci = (struct client_info *)(oc + 1);
215 end = (char *)ud + ntohs(ud->uh_ulen);
216
217 if ((char *)oc <= end) {
218 if (cu->dest_addr)
219 cu->dest_addr = (u_int32_t) original_addr.s_addr;
220 if (ntohs(cu->data_type) == 101)
221 /* Find and change our address */
222 for (i = 0; (char *)(ci + 1) <= end && i < oc->client_count; i++, ci++)
223 if (ci->address == (u_int32_t) alias_addr.s_addr) {
224 ci->address = (u_int32_t) original_addr.s_addr;
225 break;
226 }
227 }
228}
|