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

• Lines: 371
• Date: Wed Dec 31 16:00:00 1969
• Orig file: v2.3.14/linux/net/ipv4/ip_masq_irc.c
• Orig date: Mon Oct 5 12:28:09 1998

diff -u --recursive --new-file v2.3.14/linux/net/ipv4/ip_masq_irc.c linux/net/ipv4/ip_masq_irc.c
@@ -1,370 +0,0 @@
-/*
- *		IP_MASQ_IRC irc masquerading module
- *
- *
- * Version:	@(#)ip_masq_irc.c 0.03   97/11/30
- *
- * Author:	Juan Jose Ciarlante
- *		
- * Additions:
- *  - recognize a few non-irc-II DCC requests (Oliver Wagner)
- *     DCC MOVE (AmIRC/DCC.MOVE; SEND with resuming)
- *     DCC SCHAT (AmIRC IDEA encrypted CHAT)
- *     DCC TSEND (AmIRC/PIRCH SEND without ACKs)
- * Fixes:
- *	Juan Jose Ciarlante	:  set NO_DADDR flag in ip_masq_new()
- *	Nigel Metheringham	:  Added multiple port support 
- *	Juan Jose Ciarlante	:  litl bits for 2.1
- *	Oliver Wagner 		:  more IRC cmds processing
- *	  <winmute@lucifer.gv.kotnet.org>
- *	Juan Jose Ciarlante	:  put new ms entry to listen()
- *
- * FIXME:
- *	- detect also previous "PRIVMSG" string ?.
- *
- *	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 <linux/types.h>
-#include <linux/kernel.h>
-#include <asm/system.h>
-#include <linux/skbuff.h>
-#include <linux/in.h>
-#include <linux/ip.h>
-#include <linux/init.h>
-#include <net/protocol.h>
-#include <net/tcp.h>
-#include <net/ip_masq.h>
-
-
-/* 
- * List of ports (up to MAX_MASQ_APP_PORTS) to be handled by helper
- * First port is set to the default port.
- */
-int ports[MAX_MASQ_APP_PORTS] = {6667}; /* 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");
-
-
-/*
- * List of supported DCC protocols
- */
-
-#define NUM_DCCPROTO 5
-
-struct dccproto 
-{
-  char *match;
-  int matchlen;
-  int xtra_args;
-};
-
-struct dccproto dccprotos[NUM_DCCPROTO] = {
- { "SEND ", 5, 1 },
- { "CHAT ", 5, 0, },
- { "MOVE ", 5, 1 },
- { "TSEND ", 6, 1, },
- { "SCHAT ", 6, 0, }
-};
-#define MAXMATCHLEN 6
-
-static int
-masq_irc_init_1 (struct ip_masq_app *mapp, struct ip_masq *ms)
-{
-        MOD_INC_USE_COUNT;
-        return 0;
-}
-
-static int
-masq_irc_done_1 (struct ip_masq_app *mapp, struct ip_masq *ms)
-{
-        MOD_DEC_USE_COUNT;
-        return 0;
-}
-
-int
-masq_irc_out (struct ip_masq_app *mapp, struct ip_masq *ms, struct sk_buff **skb_p, __u32 maddr)
-{
-        struct sk_buff *skb;
-	struct iphdr *iph;
-	struct tcphdr *th;
-	char *data, *data_limit;
-	__u32 s_addr;
-	__u16 s_port;
-	struct ip_masq *n_ms;
-	char buf[20];		/* "m_addr m_port" (dec base)*/
-        unsigned buf_len;
-	int diff;
-        int xtra_args = 0;      /* extra int args wanted after addr */
-        char *dcc_p, *addr_beg_p, *addr_end_p;
-
-        skb = *skb_p;
-	iph = skb->nh.iph;
-        th = (struct tcphdr *)&(((char *)iph)[iph->ihl*4]);
-        data = (char *)&th[1];
-
-        /*
-	 *	Hunt irc DCC string, the _shortest_:
-	 *
-	 *	strlen("DCC CHAT chat AAAAAAAA P\x01\n")=26
-	 *	strlen("DCC SCHAT chat AAAAAAAA P\x01\n")=27
-	 *	strlen("DCC SEND F AAAAAAAA P S\x01\n")=25
-	 *	strlen("DCC MOVE F AAAAAAAA P S\x01\n")=25
-	 *	strlen("DCC TSEND F AAAAAAAA P S\x01\n")=26
-	 *	strlen("DCC MOVE F AAAAAAAA P S\x01\n")=25
-	 *		AAAAAAAAA: bound addr (1.0.0.0==16777216, min 8 digits)
-	 *		P:         bound port (min 1 d )
-	 *		F:         filename   (min 1 d )
-	 *		S:         size       (min 1 d ) 
-	 *		0x01, \n:  terminators
-         */
-
-        data_limit = skb->h.raw + skb->len;
-        
-	while (data < (data_limit - ( 21 + MAXMATCHLEN ) ) )
-	{
-		int i;
-		if (memcmp(data,"DCC ",4))  {
-			data ++;
-			continue;
-		}
-
-		dcc_p = data;
-		data += 4;     /* point to DCC cmd */
-
-		for(i=0; i<NUM_DCCPROTO; i++)
-		{
-			/*
-			 * go through the table and hunt a match string
-			 */
-
-			if( memcmp(data, dccprotos[i].match, dccprotos[i].matchlen ) == 0 )
-			{
-				xtra_args = dccprotos[i].xtra_args;
-				data += dccprotos[i].matchlen;
-
-				/*
-				 *	skip next string.
-				 */
-
-				while( *data++ != ' ')
-
-					/*
-					 *	must still parse, at least, "AAAAAAAA P\x01\n",
-					 *      12 bytes left.
-					 */
-					if (data > (data_limit-12)) return 0;
-
-
-				addr_beg_p = data;
-
-				/*
-				 *	client bound address in dec base
-				 */
-
-				s_addr = simple_strtoul(data,&data,10);
-				if (*data++ !=' ')
-					continue;
-
-				/*
-				 *	client bound port in dec base
-				 */
-
-				s_port = simple_strtoul(data,&data,10);
-				addr_end_p = data;
-
-				/*
-				 *	should check args consistency?
-				 */
-
-				while(xtra_args) {
-					if (*data != ' ')
-						break;
-					data++;
-					simple_strtoul(data,&data,10);
-					xtra_args--;
-				}
-
-				if (xtra_args != 0) continue;
-
-				/*
-				 *	terminators.
-				 */
-
-				if (data[0] != 0x01)
-					continue;
-				if (data[1]!='\r' && data[1]!='\n')
-					continue;
-
-				/*
-				 *	Now create an masquerade entry for it
-				 * 	must set NO_DPORT and NO_DADDR because
-				 *	connection is requested by another client.
-				 */
-
-				n_ms = ip_masq_new(IPPROTO_TCP,
-						maddr, 0,
-						htonl(s_addr),htons(s_port),
-						0, 0,
-						IP_MASQ_F_NO_DPORT|IP_MASQ_F_NO_DADDR);
-				if (n_ms==NULL)
-					return 0;
-
-				/*
-				 * Replace the old "address port" with the new one
-				 */
-
-				buf_len = sprintf(buf,"%lu %u",
-						ntohl(n_ms->maddr),ntohs(n_ms->mport));
-
-				/*
-				 * Calculate required delta-offset to keep TCP happy
-				 */
-
-				diff = buf_len - (addr_end_p-addr_beg_p);
-
-				*addr_beg_p = '\0';
-				IP_MASQ_DEBUG(1-debug, "masq_irc_out(): '%s' %X:%X detected (diff=%d)\n", dcc_p, s_addr,s_port, diff);
-
-				/*
-				 *	No shift.
-				 */
-
-				if (diff==0) {
-					/*
-					 * simple case, just copy.
-					 */
-					memcpy(addr_beg_p,buf,buf_len);
-				} else {
-
-					*skb_p = ip_masq_skb_replace(skb, GFP_ATOMIC,
-							addr_beg_p, addr_end_p-addr_beg_p,
-							buf, buf_len);
-				}
-				ip_masq_listen(n_ms);
-				ip_masq_put(n_ms);
-				return diff;
-			}
-		}
-	}
-	return 0;
-
-}
-
-/*
- *	Main irc object
- *     	You need 1 object per port in case you need
- *	to offer also other used irc ports (6665,6666,etc),
- *	they will share methods but they need own space for
- *	data. 
- */
-
-struct ip_masq_app ip_masq_irc = {
-        NULL,			/* next */
-	"irc",			/* name */
-        0,                      /* type */
-        0,                      /* n_attach */
-        masq_irc_init_1,        /* init_1 */
-        masq_irc_done_1,        /* done_1 */
-        masq_irc_out,           /* pkt_out */
-        NULL                    /* pkt_in */
-};
-
-/*
- * 	ip_masq_irc initialization
- */
-
-__initfunc(int ip_masq_irc_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_irc, sizeof(struct ip_masq_app));
-			if ((j = register_ip_masq_app(masq_incarnations[i], 
-						      IPPROTO_TCP, 
-						      ports[i]))) {
-				return j;
-			}
-			IP_MASQ_DEBUG(1-debug,
-					"Irc: loaded support on port[%d] = %d\n",
-			       i, ports[i]);
-		} else {
-			/* To be safe, force the incarnation table entry to NULL */
-			masq_incarnations[i] = NULL;
-		}
-	}
-	return 0;
-}
-
-/*
- * 	ip_masq_irc fin.
- */
-
-int ip_masq_irc_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, "Irc: unloaded support on port[%d] = %d\n",
-				       i, ports[i]);
-			}
-		}
-	}
-	return k;
-}
-
-
-#ifdef MODULE
-EXPORT_NO_SYMBOLS;
-
-int init_module(void)
-{
-        if (ip_masq_irc_init() != 0)
-                return -EIO;
-        return 0;
-}
-
-void cleanup_module(void)
-{
-        if (ip_masq_irc_done() != 0)
-                printk(KERN_INFO "ip_masq_irc: can't remove module");
-}
-
-#endif /* MODULE */