patch-2.3.15 linux/net/ipv4/ip_masq_cuseeme.c

• Lines: 265
• Date: Wed Dec 31 16:00:00 1969
• Orig file: v2.3.14/linux/net/ipv4/ip_masq_cuseeme.c
• Orig date: Tue Oct 27 09:57:19 1998

diff -u --recursive --new-file v2.3.14/linux/net/ipv4/ip_masq_cuseeme.c linux/net/ipv4/ip_masq_cuseeme.c
@@ -1,264 +0,0 @@
-/*
- *		IP_MASQ_FTP CUSeeMe masquerading module
- *
- *
- * Version:	@(#)$Id: ip_masq_cuseeme.c,v 1.4 1998/10/06 04:48:57 davem Exp $
- *
- * Author:	Richard Lynch
- *		
- *
- * Fixes:
- *	Richard Lynch     	:	Updated patch to conform to new module
- *					specifications
- *	Nigel Metheringham	:	Multiple port support
- *	Michael Owings		:	Fixed broken init code
- *					Added code to update inbound
- *					packets with correct local addresses.
- *					Fixes audio and "chat" problems
- *					Thanx to the CU-SeeMe Consortium for
- *					technical docs
- *	Steven Clarke		:	Small changes for 2.1	
- *
- *
- *
- *	This program is free software; you can redistribute it and/or
- *	modify it under the terms of the GNU General Public License
- *	as published by the Free Software Foundation; either version
- *	2 of the License, or (at your option) any later version.
- *	
- * Multiple Port Support
- *	The helper can be made to handle up to MAX_MASQ_APP_PORTS (normally 12)
- *	with the port numbers being defined at module load time.  The module
- *	uses the symbol "ports" to define a list of monitored ports, which can
- *	be specified on the insmod command line as
- *		ports=x1,x2,x3...
- *	where x[n] are integer port numbers.  This option can be put into
- *	/etc/conf.modules (or /etc/modules.conf depending on your config)
- *	where modload will pick it up should you use modload to load your
- *	modules.
- *	
- */
-
-#include <linux/config.h>
-#include <linux/module.h>
-#include <asm/system.h>
-#include <linux/types.h>
-#include <linux/kernel.h>
-#include <linux/skbuff.h>
-#include <linux/in.h>
-#include <linux/ip.h>
-#include <linux/init.h>
-#include <net/protocol.h>
-#include <net/udp.h>
-
-/* #define IP_MASQ_NDEBUG */
-#include <net/ip_masq.h>
-
-#pragma pack(1)
-/* CU-SeeMe Data Header */
-typedef struct {
-	u_short 	dest_family;
-	u_short 	dest_port;
-	u_long  	dest_addr;
-	short 		family;
-	u_short 	port;
-	u_long 		addr;
-	u_long 		seq;
-	u_short 	msg;
-	u_short		data_type;
-	u_short		packet_len;
-} cu_header;
-
-/* Open Continue Header */
-typedef struct	{
-	cu_header	cu_head;
-	u_short 	client_count; /* Number of client info structs */
-	u_long		seq_no;
-	char		user_name[20];
-	char		stuff[4]; /* flags,  version stuff,  etc */
-}oc_header;
-
-/* client info structures */
-typedef struct {
-	u_long		address; /* Client address */
-	char	       	stuff[8]; /* Flags, pruning bitfield,  packet counts etc */
-} client_info;
-#pragma pack()
-
-/*
- * List of ports (up to MAX_MASQ_APP_PORTS) to be handled by helper
- * First port is set to the default port.
- */
-static int ports[MAX_MASQ_APP_PORTS] = {7648}; /* I rely on the trailing items being set to zero */
-struct ip_masq_app *masq_incarnations[MAX_MASQ_APP_PORTS];
-
-/*
- *     Debug level
- */
-#ifdef CONFIG_IP_MASQ_DEBUG
-static int debug=0;
-MODULE_PARM(debug, "i");
-#endif
-
-MODULE_PARM(ports, "1-" __MODULE_STRING(MAX_MASQ_APP_PORTS) "i");
-
-static int
-masq_cuseeme_init_1 (struct ip_masq_app *mapp, struct ip_masq *ms)
-{
-        MOD_INC_USE_COUNT;
-        return 0;
-}
-
-static int
-masq_cuseeme_done_1 (struct ip_masq_app *mapp, struct ip_masq *ms)
-{
-        MOD_DEC_USE_COUNT;
-        return 0;
-}
-
-int
-masq_cuseeme_out (struct ip_masq_app *mapp, struct ip_masq *ms, struct sk_buff **skb_p, __u32 maddr)
-{
-	struct sk_buff *skb = *skb_p;
-	struct iphdr *iph = skb->nh.iph;
-	struct udphdr *uh = (struct udphdr *)&(((char *)iph)[iph->ihl*4]);
-	cu_header *cu_head;
-	char *data=(char *)&uh[1];
-
-	if (skb->len - ((unsigned char *) data - skb->h.raw) >= sizeof(cu_header))
-	{
-		cu_head         = (cu_header *) data;
-		/* cu_head->port   = ms->mport; */
-	        if( cu_head->addr )
-		cu_head->addr = (u_long) maddr;
-	        if(ntohs(cu_head->data_type) == 257)
-		        IP_MASQ_DEBUG(1-debug, "Sending talk packet!\n");
-	}
-	return 0;
-}
-
-int
-masq_cuseeme_in (struct ip_masq_app *mapp, struct ip_masq *ms, struct sk_buff **skb_p, __u32 maddr)
-{
-	struct sk_buff *skb = *skb_p;
-	struct iphdr *iph = skb->nh.iph;
-	struct udphdr *uh = (struct udphdr *)&(((char *)iph)[iph->ihl*4]);
-	cu_header *cu_head;
-	oc_header	*oc;
-	client_info	*ci;
-	char *data=(char *)&uh[1];
-	u_short len = skb->len - ((unsigned char *) data - skb->h.raw);
-	int		i, off;
-
-	if (len >= sizeof(cu_header))
-	{
-		cu_head         = (cu_header *) data;
-		if(cu_head->dest_addr) /* Correct destination address */
-			cu_head->dest_addr = (u_long) ms->saddr;
-		if(ntohs(cu_head->data_type)==101 && len > sizeof(oc_header))
-		{
-			oc = (oc_header * ) data;
-			/* Spin (grovel) thru client_info structs till we find our own */
-		        off=sizeof(oc_header);
-			for(i=0;
-			    (i < oc->client_count && off+sizeof(client_info) <= len);
-			    i++)		    
-			{
-			        ci=(client_info *)(data+off);
-				if(ci->address==(u_long) maddr)
-				{
-				        /* Update w/ our real ip address and exit */
-					ci->address = (u_long) ms->saddr;
-					break;
-				}
-			        else
-				   off+=sizeof(client_info);
-			}
-		}
-	}
-	return 0;
-}
-
-struct ip_masq_app ip_masq_cuseeme = {
-        NULL,			/* next */
-        "cuseeme",
-        0,                      /* type */
-        0,                      /* n_attach */
-        masq_cuseeme_init_1,	/* ip_masq_init_1 */
-        masq_cuseeme_done_1,	/* ip_masq_done_1 */
-        masq_cuseeme_out,	/* pkt_out */
-        masq_cuseeme_in    	/* pkt_in */
-};
-
-
-/*
- * 	ip_masq_cuseeme initialization
- */
-
-__initfunc(int ip_masq_cuseeme_init(void))
-{
-	int i, j;
-
-	for (i=0; (i<MAX_MASQ_APP_PORTS); i++) {
-		if (ports[i]) {
-			if ((masq_incarnations[i] = kmalloc(sizeof(struct ip_masq_app),
-							    GFP_KERNEL)) == NULL)
-				return -ENOMEM;
-			memcpy(masq_incarnations[i], &ip_masq_cuseeme, sizeof(struct ip_masq_app));
-			if ((j = register_ip_masq_app(masq_incarnations[i], 
-						      IPPROTO_UDP,
-						      ports[i]))) {
-				return j;
-			}
-#if DEBUG_CONFIG_IP_MASQ_CUSEEME
-			IP_MASQ_DEBUG(1-debug, "CuSeeMe: loaded support on port[%d] = %d\n",
-			       i, ports[i]);
-#endif
-		} else {
-			/* To be safe, force the incarnation table entry to NULL */
-			masq_incarnations[i] = NULL;
-		}
-	}
-	return 0;
-}
-
-/*
- * 	ip_masq_cuseeme fin.
- */
-
-int ip_masq_cuseeme_done(void)
-{
-	int i, j, k;
-
-	k=0;
-	for (i=0; (i<MAX_MASQ_APP_PORTS); i++) {
-		if (masq_incarnations[i]) {
-			if ((j = unregister_ip_masq_app(masq_incarnations[i]))) {
-				k = j;
-			} else {
-				kfree(masq_incarnations[i]);
-				masq_incarnations[i] = NULL;
-				IP_MASQ_DEBUG(1-debug, "CuSeeMe: unloaded support on port[%d] = %d\n", i, ports[i]);
-			}
-		}
-	}
-	return k;
-}
-
-#ifdef MODULE
-EXPORT_NO_SYMBOLS;
-
-int init_module(void)
-{
-        if (ip_masq_cuseeme_init() != 0)
-                return -EIO;
-        return 0;
-}
-
-void cleanup_module(void)
-{
-        if (ip_masq_cuseeme_done() != 0)
-                IP_MASQ_DEBUG(1-debug, "ip_masq_cuseeme: can't remove module");
-}
-
-#endif /* MODULE */