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Add CUSEEME support. This has *not* been tested, nor

Browse Source 
could I find anyone to test it, so please report any
problems to me.
This commit is contained in:
Brian Somers 1998-06-24 06:58:00 +00:00
parent 7fbcb4ce39
commit 0579bd7175
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=37131
8 changed files with 262 additions and 4 deletions
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4
lib/libalias/Makefile
View File

@ -2,8 +2,8 @@ LIB= alias
SHLIB_MAJOR= 2
SHLIB_MINOR= 5
CFLAGS+=-Wall -I${.CURDIR}
SRCS= alias.c alias_db.c alias_ftp.c alias_irc.c alias_util.c alias_old.c \
alias_nbt.c
SRCS= alias.c alias_cuseeme.c alias_db.c alias_ftp.c alias_irc.c \
alias_nbt.c alias_old.c alias_util.c
MAN3=libalias.3

7
lib/libalias/alias.c
View File

@ -99,6 +99,7 @@
#define FTP_CONTROL_PORT_NUMBER 21
#define IRC_CONTROL_PORT_NUMBER_1 6667
#define IRC_CONTROL_PORT_NUMBER_2 6668
#define CUSEEME_PORT_NUMBER 7648
/*
The following macro is used to update an
@ -623,6 +624,9 @@ UdpAliasIn(struct ip *pip)
&ud->uh_dport );
}
if (ntohs(ud->uh_dport) == CUSEEME_PORT_NUMBER)
AliasHandleCUSeeMeIn(pip, original_address);
/* If UDP checksum is not zero, then adjust since destination port */
/* is being unaliased and destination port is being altered. */
if (ud->uh_sum != 0)
@ -668,6 +672,9 @@ UdpAliasOut(struct ip *pip)
alias_address = GetAliasAddress(link);
alias_port = GetAliasPort(link);
if (ntohs(ud->uh_dport) == CUSEEME_PORT_NUMBER)
AliasHandleCUSeeMeOut(pip, link);
/* If NETBIOS Datagram, It should be alias address in UDP Data, too */
if (ntohs(ud->uh_dport) == NETBIOS_DGM_PORT_NUMBER
|| ntohs(ud->uh_sport) == NETBIOS_DGM_PORT_NUMBER )

120
lib/libalias/alias_cuseeme.c Normal file
View File

@ -0,0 +1,120 @@
/*-
* 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.
*
* $Id$
*/
#include <sys/types.h>
#include <netinet/in_systm.h>
#include <netinet/in.h>
#include <netinet/ip.h>
#include <netinet/udp.h>
#include "alias_local.h"
/* 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 */
};
void
AliasHandleCUSeeMeOut(struct ip *pip, struct alias_link *link)
{
struct udphdr *ud;
ud = (struct udphdr *)((char *)pip + (pip->ip_hl << 2));
if(ud->uh_ulen >= sizeof(struct cu_header)) {
struct cu_header *cu;
struct alias_link *cu_link;
cu = (struct cu_header *)(ud + 1);
if (cu->addr)
cu->addr = (u_int32_t)GetAliasAddress(link).s_addr;
cu_link = FindUdpTcpOut(pip->ip_src, GetDestAddress(link),
ud->uh_dport, 0, IPPROTO_UDP);
#ifndef NO_FW_PUNCH
if (cu_link)
PunchFWHole(cu_link);
#endif
}
}
void
AliasHandleCUSeeMeIn(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;
alias_addr.s_addr = pip->ip_dst.s_addr;
ud = (struct udphdr *)((char *)pip + (pip->ip_hl << 2));
cu = (struct cu_header *)(ud + 1);
oc = (struct oc_header *)(cu + 1);
ci = (struct client_info *)(oc + 1);
end = (char *)cu + 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;
}
}
}

2
lib/libalias/alias_local.h
View File

@ -92,6 +92,8 @@ void AliasHandleFtpOut(struct ip *, struct alias_link *, int);
void AliasHandleIrcOut(struct ip *pip, struct alias_link *link, int maxsize );
void AliasHandleUdpNbt(struct ip *, struct alias_link *, struct in_addr *, u_short);
void AliasHandleUdpNbtNS(struct ip *, struct alias_link *, struct in_addr *, u_short *, struct in_addr *, u_short *);
void AliasHandleCUSeeMeOut(struct ip *, struct alias_link *);
void AliasHandleCUSeeMeIn(struct ip *, struct in_addr);

4
sys/netinet/libalias/Makefile
View File

@ -2,8 +2,8 @@ LIB= alias
SHLIB_MAJOR= 2
SHLIB_MINOR= 5
CFLAGS+=-Wall -I${.CURDIR}
SRCS= alias.c alias_db.c alias_ftp.c alias_irc.c alias_util.c alias_old.c \
alias_nbt.c
SRCS= alias.c alias_cuseeme.c alias_db.c alias_ftp.c alias_irc.c \
alias_nbt.c alias_old.c alias_util.c
MAN3=libalias.3

7
sys/netinet/libalias/alias.c
View File

@ -99,6 +99,7 @@
#define FTP_CONTROL_PORT_NUMBER 21
#define IRC_CONTROL_PORT_NUMBER_1 6667
#define IRC_CONTROL_PORT_NUMBER_2 6668
#define CUSEEME_PORT_NUMBER 7648
/*
The following macro is used to update an
@ -623,6 +624,9 @@ UdpAliasIn(struct ip *pip)
&ud->uh_dport );
}
if (ntohs(ud->uh_dport) == CUSEEME_PORT_NUMBER)
AliasHandleCUSeeMeIn(pip, original_address);
/* If UDP checksum is not zero, then adjust since destination port */
/* is being unaliased and destination port is being altered. */
if (ud->uh_sum != 0)
@ -668,6 +672,9 @@ UdpAliasOut(struct ip *pip)
alias_address = GetAliasAddress(link);
alias_port = GetAliasPort(link);
if (ntohs(ud->uh_dport) == CUSEEME_PORT_NUMBER)
AliasHandleCUSeeMeOut(pip, link);
/* If NETBIOS Datagram, It should be alias address in UDP Data, too */
if (ntohs(ud->uh_dport) == NETBIOS_DGM_PORT_NUMBER
|| ntohs(ud->uh_sport) == NETBIOS_DGM_PORT_NUMBER )

120
sys/netinet/libalias/alias_cuseeme.c Normal file
View File

@ -0,0 +1,120 @@
/*-
* 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.
*
* $Id$
*/
#include <sys/types.h>
#include <netinet/in_systm.h>
#include <netinet/in.h>
#include <netinet/ip.h>
#include <netinet/udp.h>
#include "alias_local.h"
/* 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 */
};
void
AliasHandleCUSeeMeOut(struct ip *pip, struct alias_link *link)
{
struct udphdr *ud;
ud = (struct udphdr *)((char *)pip + (pip->ip_hl << 2));
if(ud->uh_ulen >= sizeof(struct cu_header)) {
struct cu_header *cu;
struct alias_link *cu_link;
cu = (struct cu_header *)(ud + 1);
if (cu->addr)
cu->addr = (u_int32_t)GetAliasAddress(link).s_addr;
cu_link = FindUdpTcpOut(pip->ip_src, GetDestAddress(link),
ud->uh_dport, 0, IPPROTO_UDP);
#ifndef NO_FW_PUNCH
if (cu_link)
PunchFWHole(cu_link);
#endif
}
}
void
AliasHandleCUSeeMeIn(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;
alias_addr.s_addr = pip->ip_dst.s_addr;
ud = (struct udphdr *)((char *)pip + (pip->ip_hl << 2));
cu = (struct cu_header *)(ud + 1);
oc = (struct oc_header *)(cu + 1);
ci = (struct client_info *)(oc + 1);
end = (char *)cu + 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;
}
}
}

2
sys/netinet/libalias/alias_local.h
View File

@ -92,6 +92,8 @@ void AliasHandleFtpOut(struct ip *, struct alias_link *, int);
void AliasHandleIrcOut(struct ip *pip, struct alias_link *link, int maxsize );
void AliasHandleUdpNbt(struct ip *, struct alias_link *, struct in_addr *, u_short);
void AliasHandleUdpNbtNS(struct ip *, struct alias_link *, struct in_addr *, u_short *, struct in_addr *, u_short *);
void AliasHandleCUSeeMeOut(struct ip *, struct alias_link *);
void AliasHandleCUSeeMeIn(struct ip *, struct in_addr);