mirror of
git://projects.qi-hardware.com/openwrt-xburst.git
synced 2024-09-12 21:01:31 +03:00
git-svn-id: svn://svn.openwrt.org/openwrt/trunk/openwrt@511 3c298f89-4303-0410-b956-a3cf2f4a3e73
2023 lines
58 KiB
Groff
2023 lines
58 KiB
Groff
diff -Nurp linux-2.4.26-stock/Documentation/Configure.help linux-2.4.26-layer7-clean/Documentation/Configure.help
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--- linux-2.4.26-stock/Documentation/Configure.help 2004-04-14 08:05:24.000000000 -0500
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+++ linux-2.4.26-layer7-clean/Documentation/Configure.help 2004-06-21 00:18:14.000000000 -0500
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@@ -28819,6 +28819,23 @@ CONFIG_SOUND_WM97XX
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If unsure, say N.
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+CONFIG_IP_NF_MATCH_LAYER7
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+ Say Y if you want to be able to classify connections (and their
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+ packets) based on regular expression matching of their application
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+ layer data. This is one way to classify applications such as
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+ peer-to-peer filesharing systems that do not always use the same
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+ port.
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+
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+ To compile it as a module, choose M here. If unsure, say N.
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+
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+CONFIG_IP_NF_MATCH_LAYER7_DEBUG
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+ Say Y to get lots of debugging output.
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+
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+CONFIG_IP_NF_MATCH_LAYER7_MAXDATALEN
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+ Size of the buffer that the application layer data is stored in.
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+ Unless you know what you're doing, leave it at the default of 2048
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+ Bytes.
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+
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#
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# A couple of things I keep forgetting:
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# capitalize: AppleTalk, Ethernet, DOS, DMA, FAT, FTP, Internet,
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diff -Nurp linux-2.4.26-stock/include/linux/netfilter_ipv4/ip_conntrack.h linux-2.4.26-layer7-clean/include/linux/netfilter_ipv4/ip_conntrack.h
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--- linux-2.4.26-stock/include/linux/netfilter_ipv4/ip_conntrack.h 2004-04-14 08:05:40.000000000 -0500
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+++ linux-2.4.26-layer7-clean/include/linux/netfilter_ipv4/ip_conntrack.h 2004-06-21 00:18:28.000000000 -0500
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@@ -207,6 +207,17 @@ struct ip_conntrack
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} nat;
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#endif /* CONFIG_IP_NF_NAT_NEEDED */
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+#if defined(CONFIG_IP_NF_MATCH_LAYER7) || defined(CONFIG_IP_NF_MATCH_LAYER7_MODULE)
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+ struct {
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+ unsigned int numpackets; /* surely this is kept track of somewhere else, right? I can't find it... */
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+ char * app_proto; /* "http", "ftp", etc. NULL if unclassifed */
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+
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+ /* the application layer data so far. NULL if ->numpackets > numpackets */
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+ char * app_data;
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+
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+ unsigned int app_data_len;
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+ } layer7;
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+#endif
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};
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/* get master conntrack via master expectation */
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diff -Nurp linux-2.4.26-stock/include/linux/netfilter_ipv4/ipt_layer7.h linux-2.4.26-layer7-clean/include/linux/netfilter_ipv4/ipt_layer7.h
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--- linux-2.4.26-stock/include/linux/netfilter_ipv4/ipt_layer7.h 1969-12-31 18:00:00.000000000 -0600
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+++ linux-2.4.26-layer7-clean/include/linux/netfilter_ipv4/ipt_layer7.h 2004-06-21 00:18:28.000000000 -0500
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@@ -0,0 +1,26 @@
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+/*
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+ By Matthew Strait <quadong@users.sf.net>, Dec 2003.
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+ http://l7-filter.sf.net
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+
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+ This program is free software; you can redistribute it and/or
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+ modify it under the terms of the GNU General Public License
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+ as published by the Free Software Foundation; either version
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+ 2 of the License, or (at your option) any later version.
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+ http://www.gnu.org/licenses/gpl.txt
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+*/
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+
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+#ifndef _IPT_LAYER7_H
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+#define _IPT_LAYER7_H
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+
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+#define MAX_PATTERN_LEN 8192
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+#define MAX_PROTOCOL_LEN 256
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+
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+typedef char *(*proc_ipt_search) (char *, char, char *);
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+
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+struct ipt_layer7_info {
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+ char protocol[MAX_PROTOCOL_LEN];
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+ char invert:1;
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+ char pattern[MAX_PATTERN_LEN];
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+};
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+
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+#endif /* _IPT_LAYER7_H */
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diff -Nurp linux-2.4.26-stock/net/ipv4/netfilter/Config.in linux-2.4.26-layer7-clean/net/ipv4/netfilter/Config.in
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--- linux-2.4.26-stock/net/ipv4/netfilter/Config.in 2003-08-25 06:44:44.000000000 -0500
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+++ linux-2.4.26-layer7-clean/net/ipv4/netfilter/Config.in 2004-06-21 00:15:23.000000000 -0500
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@@ -43,6 +43,10 @@ if [ "$CONFIG_IP_NF_IPTABLES" != "n" ];
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if [ "$CONFIG_EXPERIMENTAL" = "y" ]; then
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dep_tristate ' Unclean match support (EXPERIMENTAL)' CONFIG_IP_NF_MATCH_UNCLEAN $CONFIG_IP_NF_IPTABLES
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dep_tristate ' Owner match support (EXPERIMENTAL)' CONFIG_IP_NF_MATCH_OWNER $CONFIG_IP_NF_IPTABLES
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+ dep_tristate ' Layer 7 match support (EXPERIMENTAL)' CONFIG_IP_NF_MATCH_LAYER7 $CONFIG_IP_NF_CONNTRACK
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+ dep_mbool ' Layer 7 debugging output (EXPERIMENTAL)' CONFIG_IP_NF_MATCH_LAYER7_DEBUG $CONFIG_IP_NF_MATCH_LAYER7
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+ int ' Buffer size for application layer data (256-65536)' CONFIG_IP_NF_MATCH_LAYER7_MAXDATALEN 2048
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+
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fi
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# The targets
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dep_tristate ' Packet filtering' CONFIG_IP_NF_FILTER $CONFIG_IP_NF_IPTABLES
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diff -Nurp linux-2.4.26-stock/net/ipv4/netfilter/Makefile linux-2.4.26-layer7-clean/net/ipv4/netfilter/Makefile
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--- linux-2.4.26-stock/net/ipv4/netfilter/Makefile 2003-08-25 06:44:44.000000000 -0500
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+++ linux-2.4.26-layer7-clean/net/ipv4/netfilter/Makefile 2004-06-21 00:15:22.000000000 -0500
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@@ -87,6 +87,8 @@ obj-$(CONFIG_IP_NF_MATCH_CONNTRACK) += i
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obj-$(CONFIG_IP_NF_MATCH_UNCLEAN) += ipt_unclean.o
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obj-$(CONFIG_IP_NF_MATCH_TCPMSS) += ipt_tcpmss.o
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+obj-$(CONFIG_IP_NF_MATCH_LAYER7) += ipt_layer7.o
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+
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# targets
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obj-$(CONFIG_IP_NF_TARGET_REJECT) += ipt_REJECT.o
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obj-$(CONFIG_IP_NF_TARGET_MIRROR) += ipt_MIRROR.o
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diff -Nurp linux-2.4.26-stock/net/ipv4/netfilter/ip_conntrack_core.c linux-2.4.26-layer7-clean/net/ipv4/netfilter/ip_conntrack_core.c
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--- linux-2.4.26-stock/net/ipv4/netfilter/ip_conntrack_core.c 2004-02-18 07:36:32.000000000 -0600
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+++ linux-2.4.26-layer7-clean/net/ipv4/netfilter/ip_conntrack_core.c 2004-06-21 00:15:22.000000000 -0500
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@@ -339,6 +339,15 @@ destroy_conntrack(struct nf_conntrack *n
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}
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kfree(ct->master);
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}
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+
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+ #if defined(CONFIG_IP_NF_MATCH_LAYER7) || defined(CONFIG_IP_NF_MATCH_LAYER7_MODULE)
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+ /* This ought to get free'd somewhere. How about here? */
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+ if(ct->layer7.app_proto) /* this is sufficient, right? */
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+ kfree(ct->layer7.app_proto);
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+ if(ct->layer7.app_data)
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+ kfree(ct->layer7.app_data);
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+ #endif
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+
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WRITE_UNLOCK(&ip_conntrack_lock);
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if (master)
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diff -Nurp linux-2.4.26-stock/net/ipv4/netfilter/ip_conntrack_standalone.c linux-2.4.26-layer7-clean/net/ipv4/netfilter/ip_conntrack_standalone.c
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--- linux-2.4.26-stock/net/ipv4/netfilter/ip_conntrack_standalone.c 2004-02-18 07:36:32.000000000 -0600
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+++ linux-2.4.26-layer7-clean/net/ipv4/netfilter/ip_conntrack_standalone.c 2004-06-21 00:15:22.000000000 -0500
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@@ -107,6 +107,13 @@ print_conntrack(char *buffer, struct ip_
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len += sprintf(buffer + len, "[ASSURED] ");
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len += sprintf(buffer + len, "use=%u ",
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atomic_read(&conntrack->ct_general.use));
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+
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+ #if defined(CONFIG_IP_NF_MATCH_LAYER7) || defined(CONFIG_IP_NF_MATCH_LAYER7_MODULE)
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+ if(conntrack->layer7.app_proto)
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+ len += sprintf(buffer + len, "l7proto=%s ",
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+ conntrack->layer7.app_proto);
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+ #endif
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+
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len += sprintf(buffer + len, "\n");
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return len;
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diff -Nurp linux-2.4.26-stock/net/ipv4/netfilter/ipt_layer7.c linux-2.4.26-layer7-clean/net/ipv4/netfilter/ipt_layer7.c
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--- linux-2.4.26-stock/net/ipv4/netfilter/ipt_layer7.c 1969-12-31 18:00:00.000000000 -0600
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+++ linux-2.4.26-layer7-clean/net/ipv4/netfilter/ipt_layer7.c 2004-06-27 19:06:51.000000000 -0500
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@@ -0,0 +1,540 @@
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+/*
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+ Kernel module to match application layer (OSI layer 7)
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+ data in connections.
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+
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+ http://l7-filter.sf.net
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+
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+ By Matthew Strait and Ethan Sommer, 2003.
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+
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+ This program is free software; you can redistribute it and/or
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+ modify it under the terms of the GNU General Public License
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+ as published by the Free Software Foundation; either version
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+ 2 of the License, or (at your option) any later version.
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+ http://www.gnu.org/licenses/gpl.txt
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+
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+ Based on ipt_string.c (C) 2000 Emmanuel Roger <winfield@freegates.be>
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+ and cls_layer7.c (C) 2003 Matthew Strait, Ethan Sommer, Justin Levandoski
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+*/
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+
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+#include <linux/module.h>
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+#include <linux/skbuff.h>
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+#include <linux/netfilter_ipv4/ip_conntrack.h>
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+#include <linux/proc_fs.h>
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+#include <linux/ctype.h>
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+#include <net/ip.h>
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+#include <net/tcp.h>
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+
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+#include "regexp/regexp.c"
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+
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+#include <linux/netfilter_ipv4/ipt_layer7.h>
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+#include <linux/netfilter_ipv4/ip_tables.h>
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+
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+MODULE_AUTHOR("Matthew Strait <quadong@users.sf.net>, Ethan Sommer <sommere@users.sf.net>");
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+MODULE_LICENSE("GPL");
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+MODULE_DESCRIPTION("iptables application layer match module");
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+
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+#if defined(CONFIG_IP_NF_MATCH_LAYER7_DEBUG)
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+ #define DPRINTK(format,args...) printk(format,##args)
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+#else
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+ #define DPRINTK(format,args...)
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+#endif
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+
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+/* Number of packets whose data we look at.
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+This can be modified through /proc/net/layer7_numpackets */
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+static int num_packets = 8;
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+
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+static struct pattern_cache {
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+ char * regex_string;
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+ regexp * pattern;
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+ struct pattern_cache * next;
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+} * first_pattern_cache = NULL;
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+
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+/* I'm new to locking. Here are my assumptions:
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+
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+- No one is going to write to /proc/net/layer7_numpackets over and over
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+ within a short period of time, and if they did, nothing awful would happen.
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+
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+- This code will never be processing the same packet twice at the same time,
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+ because iptables rules need to be traversed in order.
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+
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+- It doesn't matter if two packets from different connections are in here at
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+ the same time, because they don't share any data.
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+
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+- It _does_ matter if two packets from the same connection are here at the same
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+ time. In this case, the things we have to protect are the conntracks and
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+ the list of compiled patterns.
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+*/
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+DECLARE_RWLOCK(ct_lock);
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+DECLARE_LOCK(list_lock);
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+
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+/* Use instead of regcomp. As we expect to be seeing the same regexps over and
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+over again, it make sense to cache the results. */
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+static regexp * compile_and_cache(char * regex_string, char * protocol)
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+{
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+ struct pattern_cache * node = first_pattern_cache;
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+ struct pattern_cache * last_pattern_cache = first_pattern_cache;
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+ struct pattern_cache * tmp;
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+ unsigned int len;
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+
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+ while (node != NULL) {
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+ if (!strcmp(node->regex_string, regex_string))
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+ return node->pattern;
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+
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+ last_pattern_cache = node;/* points at the last non-NULL node */
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+ node = node->next;
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+ }
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+
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+ /* If we reach the end of the list, then we have not yet cached
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+ the pattern for this regex. Let's do that now.
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+ Be paranoid about running out of memory to avoid list corruption. */
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+ tmp = kmalloc(sizeof(struct pattern_cache), GFP_ATOMIC);
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+
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+ if(!tmp) {
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+ printk(KERN_ERR "layer7: out of memory in compile_and_cache, bailing.\n");
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+ return NULL;
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+ }
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+
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+ tmp->regex_string = kmalloc(strlen(regex_string) + 1, GFP_ATOMIC);
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+ tmp->pattern = kmalloc(sizeof(struct regexp), GFP_ATOMIC);
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+
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+ if(!tmp->regex_string || !tmp->pattern) {
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+ printk(KERN_ERR "layer7: out of memory in compile_and_cache, bailing.\n");
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+ kfree(tmp->regex_string);
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+ kfree(tmp->pattern);
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+ kfree(tmp);
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+ return NULL;
|
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+ }
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+
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+ tmp->next = NULL;
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+ /* Ok. The new node is all ready now. */
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+ node = tmp;
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+
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+ if(first_pattern_cache == NULL) /* list is empty */
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+ first_pattern_cache = node; /* make node the beginning */
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+ else
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+ last_pattern_cache->next = node; /* attach node to the end */
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+
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+ /* copy the string and compile the regex */
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+ len = strlen(regex_string);
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+ node->pattern = regcomp(regex_string, &len);
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+ if ( !node->pattern ) {
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+ printk(KERN_ERR "layer7: Error compiling regexp \"%s\" (%s)\n",
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+ regex_string, protocol);
|
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+ /* pattern is now cached as NULL, so we won't try again. */
|
|
+ }
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+
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+ strcpy(node->regex_string, regex_string);
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+ return node->pattern;
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+}
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+
|
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+#if CONFIG_IP_NF_MATCH_LAYER7_DEBUG
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+/* Converts an unfriendly string into a friendly one by
|
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+replacing unprintables with periods and all whitespace with " ". */
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+static char * friendly_print(unsigned char * s)
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+{
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+ char * f = kmalloc(strlen(s) + 1, GFP_ATOMIC);
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+ int i;
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+
|
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+ if(!f) {
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+ printk(KERN_ERR "layer7: out of memory in friendly_print, bailing.\n");
|
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+ return NULL;
|
|
+ }
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+
|
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+ for(i = 0; i < strlen(s); i++){
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+ if(isprint(s[i]) && s[i] < 128) f[i] = s[i];
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+ else if(isspace(s[i])) f[i] = ' ';
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+ else f[i] = '.';
|
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+ }
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+ f[i] = '\0';
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+ return f;
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+}
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+
|
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+static char dec2hex(int i)
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+{
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+ switch (i) {
|
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+ case 0 ... 9:
|
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+ return (char)(i + '0');
|
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+ break;
|
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+ case 10 ... 15:
|
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+ return (char)(i - 10 + 'a');
|
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+ break;
|
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+ default:
|
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+ printk("Problem in dec2hex\n");
|
|
+ return '\0';
|
|
+ }
|
|
+}
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|
+
|
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+static char * hex_print(unsigned char * s)
|
|
+{
|
|
+ char * g = kmalloc(strlen(s)*3 + 1, GFP_ATOMIC);
|
|
+ int i;
|
|
+
|
|
+ if(!g) {
|
|
+ printk(KERN_ERR "layer7: out of memory in hex_print, bailing.\n");
|
|
+ return NULL;
|
|
+ }
|
|
+
|
|
+ for(i = 0; i < strlen(s); i++) {
|
|
+ g[i*3 ] = dec2hex(s[i]/16);
|
|
+ g[i*3 + 1] = dec2hex(s[i]%16);
|
|
+ g[i*3 + 2] = ' ';
|
|
+ }
|
|
+ g[i*3] = '\0';
|
|
+
|
|
+ return g;
|
|
+}
|
|
+#endif // DEBUG
|
|
+
|
|
+
|
|
+/* The following functions are here in case we get ported into an environment
|
|
+(ebtables?) where skb->nh.iph->protocol isn't set. They assume that skb->data
|
|
+points at the beginning of the IP datagram, which is true for iptables (but in
|
|
+QoS it points to the beginning of the Ethernet frame). */
|
|
+#if 0
|
|
+#define IP_PROTO_OFFSET 9
|
|
+static int is_tcp_over_ipv4 (const struct sk_buff *skb){return(skb->data[IP_PROTO_OFFSET]==IPPROTO_TCP );}
|
|
+static int is_udp_over_ipv4 (const struct sk_buff *skb){return(skb->data[IP_PROTO_OFFSET]==IPPROTO_UDP );}
|
|
+static int is_icmp_over_ipv4(const struct sk_buff *skb){return(skb->data[IP_PROTO_OFFSET]==IPPROTO_ICMP);}
|
|
+#endif
|
|
+
|
|
+static int can_handle(const struct sk_buff *skb)
|
|
+{
|
|
+ if(!skb->nh.iph) /* not IP */
|
|
+ return 0;
|
|
+ if(skb->nh.iph->protocol != IPPROTO_TCP &&
|
|
+ skb->nh.iph->protocol != IPPROTO_UDP &&
|
|
+ skb->nh.iph->protocol != IPPROTO_ICMP)
|
|
+ return 0;
|
|
+ return 1;
|
|
+}
|
|
+
|
|
+/* Returns offset the into the skb->data that the application data starts */
|
|
+static int app_data_offset(const struct sk_buff *skb)
|
|
+{
|
|
+ /* In case we are ported somewhere (ebtables?) where skb->nh.iph
|
|
+ isn't set, this can be gotten from 4*(skb->data[0] & 0x0f) as well. */
|
|
+ int ip_hl = 4*skb->nh.iph->ihl;
|
|
+
|
|
+ if( skb->nh.iph->protocol == IPPROTO_TCP ) {
|
|
+ /* 12 == offset into TCP header for the header length field.
|
|
+ Can't get this with skb->h.th->doff because the tcphdr
|
|
+ struct doesn't get set when routing (this is confirmed to be
|
|
+ true in Netfilter as well as QoS.) */
|
|
+ int tcp_hl = 4*(skb->data[ip_hl + 12] >> 4);
|
|
+
|
|
+ return ip_hl + tcp_hl;
|
|
+ } else if( skb->nh.iph->protocol == IPPROTO_UDP ) {
|
|
+ return ip_hl + 8; /* UDP header is always 8 bytes */
|
|
+ } else if( skb->nh.iph->protocol == IPPROTO_ICMP ) {
|
|
+ return ip_hl + 8; /* ICMP header is 8 bytes */
|
|
+ } else {
|
|
+ printk(KERN_ERR "layer7: tried to handle unknown protocol!\n");
|
|
+ return ip_hl + 8; /* something reasonable */
|
|
+ }
|
|
+}
|
|
+
|
|
+/* handles whether there's a match when we aren't appending data anymore */
|
|
+static int match_no_append(struct ip_conntrack * conntrack,
|
|
+ struct ip_conntrack * master_conntrack,
|
|
+ struct ipt_layer7_info * info)
|
|
+{
|
|
+ /* If we're in here, we don't care about the app data anymore */
|
|
+ WRITE_LOCK(&ct_lock);
|
|
+ if(master_conntrack->layer7.app_data != NULL) {
|
|
+
|
|
+ #ifdef CONFIG_IP_NF_MATCH_LAYER7_DEBUG
|
|
+ if(!master_conntrack->layer7.app_proto) {
|
|
+ char * f = friendly_print(master_conntrack->layer7.app_data);
|
|
+ char * g = hex_print(master_conntrack->layer7.app_data);
|
|
+ DPRINTK("\nGave up on the %d length stream: \n%s\n",
|
|
+ master_conntrack->layer7.app_data_len, f);
|
|
+ DPRINTK("\nIn hex: %s\n", g);
|
|
+ kfree(f);
|
|
+ kfree(g);
|
|
+ }
|
|
+ #endif
|
|
+
|
|
+ kfree(master_conntrack->layer7.app_data);
|
|
+ master_conntrack->layer7.app_data = NULL; /* don't free again */
|
|
+ }
|
|
+ WRITE_UNLOCK(&ct_lock);
|
|
+
|
|
+ /* Is top-level master (possibly self) classified? */
|
|
+ if(master_conntrack->layer7.app_proto) {
|
|
+ if(!strcmp(master_conntrack->layer7.app_proto, info->protocol))
|
|
+ {
|
|
+ /* set own .protocol (for /proc/net/ip_conntrack) */
|
|
+ WRITE_LOCK(&ct_lock);
|
|
+ if(!conntrack->layer7.app_proto) {
|
|
+ conntrack->layer7.app_proto = kmalloc(strlen(info->protocol), GFP_ATOMIC);
|
|
+ if(!conntrack->layer7.app_proto){
|
|
+ printk(KERN_ERR "layer7: out of memory in match_no_append, bailing.\n");
|
|
+ WRITE_UNLOCK(&ct_lock);
|
|
+ return 1;
|
|
+ }
|
|
+
|
|
+ strcpy(conntrack->layer7.app_proto, info->protocol);
|
|
+ }
|
|
+ WRITE_UNLOCK(&ct_lock);
|
|
+
|
|
+ return 1;
|
|
+ } else return 0;
|
|
+ } else return 0; /* no clasification */
|
|
+}
|
|
+
|
|
+/* add the new app data to the conntrack. Return number of bytes added. */
|
|
+static int add_data(struct ip_conntrack * master_conntrack,
|
|
+ char * app_data, int appdatalen)
|
|
+{
|
|
+ int length = 0, i;
|
|
+ int oldlength = master_conntrack->layer7.app_data_len;
|
|
+
|
|
+ /* Strip nulls. Make everything lower case (our regex lib doesn't
|
|
+ do case insensitivity). Add it to the end of the current data. */
|
|
+ for(i = 0; i < CONFIG_IP_NF_MATCH_LAYER7_MAXDATALEN-oldlength-1 &&
|
|
+ i < appdatalen; i++) {
|
|
+ if(app_data[i] != '\0') {
|
|
+ master_conntrack->layer7.app_data[length+oldlength] =
|
|
+ /* the kernel version of tolower mungs 'upper ascii' */
|
|
+ isascii(app_data[i])? tolower(app_data[i]) : app_data[i];
|
|
+ length++;
|
|
+ }
|
|
+ }
|
|
+
|
|
+ master_conntrack->layer7.app_data[length+oldlength] = '\0';
|
|
+ master_conntrack->layer7.app_data_len = length + oldlength;
|
|
+
|
|
+ return length;
|
|
+}
|
|
+
|
|
+/* Returns true on match and false otherwise. */
|
|
+static int match(/* const */struct sk_buff *skb, const struct net_device *in,
|
|
+ const struct net_device *out, const void *matchinfo,
|
|
+ int offset, int *hotdrop)
|
|
+{
|
|
+ struct ipt_layer7_info * info = (struct ipt_layer7_info *)matchinfo;
|
|
+ enum ip_conntrack_info master_ctinfo, ctinfo;
|
|
+ struct ip_conntrack *master_conntrack, *conntrack;
|
|
+ unsigned char * app_data;
|
|
+ unsigned int pattern_result, appdatalen;
|
|
+ regexp * comppattern;
|
|
+
|
|
+ if(!can_handle(skb)){
|
|
+ DPRINTK("layer7: This is some protocol I can't handle\n");
|
|
+ return info->invert;
|
|
+ }
|
|
+
|
|
+ LOCK_BH(&list_lock);
|
|
+ comppattern = compile_and_cache(info->pattern, info->protocol);
|
|
+ UNLOCK_BH(&list_lock);
|
|
+ /* the return value gets checked later, when we're ready to use it */
|
|
+
|
|
+ app_data = skb->data + app_data_offset(skb);
|
|
+ appdatalen = skb->tail - app_data;
|
|
+
|
|
+ /* Treat the parent and all its children together as one connection,
|
|
+ except for the purpose of setting conntrack->layer7.pattern in the
|
|
+ actual connection. This makes /proc/net/ip_conntrack somewhat more
|
|
+ satisfying. */
|
|
+ if(!(conntrack = ip_conntrack_get((struct sk_buff *)skb, &ctinfo)) ||
|
|
+ !(master_conntrack = ip_conntrack_get((struct sk_buff *)skb, &master_ctinfo))) {
|
|
+ DPRINTK("layer7: packet is not from a known connection, giving up.\n");
|
|
+ return info->invert;
|
|
+ }
|
|
+
|
|
+ /* Try to get a master conntrack (and its master etc) for FTP, etc. */
|
|
+ while (master_ct(master_conntrack) != NULL)
|
|
+ master_conntrack = master_ct(master_conntrack);
|
|
+
|
|
+ /* skb->cb[0] == seen. Avoid doing things twice if there are two layer7
|
|
+ rules. I'm not sure that using cb for this purpose is correct, although
|
|
+ it says "put your private variables there" and this seems to qualify.
|
|
+ But it doesn't look like it's being used for anything else in the
|
|
+ sk_buffs that make it here. I'm open to suggestions for how to be able
|
|
+ to write to cb without making the compiler angry. That I can't figure
|
|
+ this out is an argument against this being correct. */
|
|
+ if(!skb->cb[0]){
|
|
+ WRITE_LOCK(&ct_lock);
|
|
+ master_conntrack->layer7.numpackets++;/*starts at 0 via memset*/
|
|
+ WRITE_UNLOCK(&ct_lock);
|
|
+ }
|
|
+
|
|
+ /* On the first packet of a connection, allocate space for app data */
|
|
+ WRITE_LOCK(&ct_lock);
|
|
+ if(master_conntrack->layer7.numpackets == 1 && !skb->cb[0]) {
|
|
+ master_conntrack->layer7.app_data = kmalloc(CONFIG_IP_NF_MATCH_LAYER7_MAXDATALEN, GFP_ATOMIC);
|
|
+ if(!master_conntrack->layer7.app_data){
|
|
+ printk(KERN_ERR "layer7: out of memory in match, bailing.\n");
|
|
+ WRITE_UNLOCK(&ct_lock);
|
|
+ return info->invert;
|
|
+ }
|
|
+
|
|
+ master_conntrack->layer7.app_data[0] = '\0';
|
|
+ }
|
|
+ WRITE_UNLOCK(&ct_lock);
|
|
+
|
|
+ /* if we've classified it or seen too many packets */
|
|
+ if(master_conntrack->layer7.numpackets > num_packets ||
|
|
+ master_conntrack->layer7.app_proto) {
|
|
+
|
|
+ pattern_result = match_no_append(conntrack, master_conntrack, info);
|
|
+
|
|
+ /* mark the packet seen (probably irrelevant, but consistant) */
|
|
+ skb->cb[0] = 1;
|
|
+
|
|
+ return (pattern_result ^ info->invert);
|
|
+ }
|
|
+
|
|
+ /* Can end up here, but unallocated, if numpackets is increased during
|
|
+ the beginning of a connection */
|
|
+ if(master_conntrack->layer7.app_data == NULL)
|
|
+ return (info->invert); /* unmatched */
|
|
+
|
|
+ if(!skb->cb[0]) {
|
|
+ int newbytes;
|
|
+ WRITE_LOCK(&ct_lock);
|
|
+ newbytes = add_data(master_conntrack, app_data, appdatalen);
|
|
+ WRITE_UNLOCK(&ct_lock);
|
|
+
|
|
+ if(newbytes == 0) { /* didn't add any data */
|
|
+ skb->cb[0] = 1;
|
|
+ /* Didn't match before, not going to match now */
|
|
+ return info->invert;
|
|
+ }
|
|
+ }
|
|
+
|
|
+ /* If the regexp failed to compile, don't bother running it */
|
|
+ if(comppattern && regexec(comppattern, master_conntrack->layer7.app_data)) {
|
|
+ DPRINTK("layer7: regexec positive: %s!\n", info->protocol);
|
|
+ pattern_result = 1;
|
|
+ } else pattern_result = 0;
|
|
+
|
|
+ if(pattern_result) {
|
|
+ WRITE_LOCK(&ct_lock);
|
|
+ conntrack->layer7.app_proto = kmalloc(strlen(info->protocol), GFP_ATOMIC);
|
|
+ if(!conntrack->layer7.app_proto){
|
|
+ printk(KERN_ERR "layer7: out of memory in match, bailing.\n");
|
|
+ WRITE_UNLOCK(&ct_lock);
|
|
+ return (pattern_result ^ info->invert);
|
|
+ }
|
|
+
|
|
+ strcpy(conntrack->layer7.app_proto, info->protocol);
|
|
+ WRITE_UNLOCK(&ct_lock);
|
|
+ }
|
|
+
|
|
+ /* mark the packet seen */
|
|
+ skb->cb[0] = 1;
|
|
+
|
|
+ return (pattern_result ^ info->invert);
|
|
+}
|
|
+
|
|
+static int checkentry(const char *tablename, const struct ipt_ip *ip,
|
|
+ void *matchinfo, unsigned int matchsize, unsigned int hook_mask)
|
|
+{
|
|
+ if (matchsize != IPT_ALIGN(sizeof(struct ipt_layer7_info)))
|
|
+ return 0;
|
|
+ return 1;
|
|
+}
|
|
+
|
|
+static struct ipt_match layer7_match = {
|
|
+ .name = "layer7",
|
|
+ .match = &match,
|
|
+ .checkentry = &checkentry,
|
|
+ .me = THIS_MODULE
|
|
+};
|
|
+
|
|
+/* taken from drivers/video/modedb.c */
|
|
+static int my_atoi(const char *s)
|
|
+{
|
|
+ int val = 0;
|
|
+
|
|
+ for (;; s++) {
|
|
+ switch (*s) {
|
|
+ case '0'...'9':
|
|
+ val = 10*val+(*s-'0');
|
|
+ break;
|
|
+ default:
|
|
+ return val;
|
|
+ }
|
|
+ }
|
|
+}
|
|
+
|
|
+/* write out num_packets to userland. */
|
|
+static int layer7_read_proc(char* page, char ** start, off_t off, int count,
|
|
+ int* eof, void * data)
|
|
+{
|
|
+ if(num_packets > 99)
|
|
+ printk(KERN_ERR "layer7: NOT REACHED. num_packets too big\n");
|
|
+
|
|
+ page[0] = num_packets/10 + '0';
|
|
+ page[1] = num_packets%10 + '0';
|
|
+ page[2] = '\n';
|
|
+ page[3] = '\0';
|
|
+
|
|
+ *eof=1;
|
|
+
|
|
+ return 3;
|
|
+}
|
|
+
|
|
+/* Read in num_packets from userland */
|
|
+static int layer7_write_proc(struct file* file, const char* buffer,
|
|
+ unsigned long count, void *data)
|
|
+{
|
|
+ char * foo = kmalloc(count, GFP_ATOMIC);
|
|
+
|
|
+ if(!foo){
|
|
+ printk(KERN_ERR "layer7: out of memory, bailing. num_packets unchanged.\n");
|
|
+ return count;
|
|
+ }
|
|
+
|
|
+ /* copy in the data from userland */
|
|
+ copy_from_user(foo, buffer, count);
|
|
+
|
|
+ num_packets = my_atoi(foo);
|
|
+ kfree (foo);
|
|
+
|
|
+ /* This has an arbitrary limit to make the math easier. I'm lazy.
|
|
+ But anyway, 99 is a LOT! If you want more, you're doing it wrong! */
|
|
+ if(num_packets > 99) {
|
|
+ printk(KERN_WARNING "layer7: num_packets can't be > 99.\n");
|
|
+ num_packets = 99;
|
|
+ } else if(num_packets < 1) {
|
|
+ printk(KERN_WARNING "layer7: num_packets can't be < 1.\n");
|
|
+ num_packets = 1;
|
|
+ }
|
|
+
|
|
+ return count;
|
|
+}
|
|
+
|
|
+/* register the proc file */
|
|
+static void layer7_init_proc(void)
|
|
+{
|
|
+ struct proc_dir_entry* entry;
|
|
+
|
|
+ /* create the file */
|
|
+ entry = create_proc_entry("layer7_numpackets", 0644, proc_net);
|
|
+
|
|
+ /* set the callback functions */
|
|
+ entry->read_proc = layer7_read_proc;
|
|
+ entry->write_proc = layer7_write_proc;
|
|
+}
|
|
+
|
|
+static void layer7_cleanup_proc(void)
|
|
+{
|
|
+ remove_proc_entry("layer7_numpackets", proc_net);
|
|
+}
|
|
+
|
|
+static int __init init(void)
|
|
+{
|
|
+ layer7_init_proc();
|
|
+ return ipt_register_match(&layer7_match);
|
|
+}
|
|
+
|
|
+static void __exit fini(void)
|
|
+{
|
|
+ layer7_cleanup_proc();
|
|
+ ipt_unregister_match(&layer7_match);
|
|
+}
|
|
+
|
|
+module_init(init);
|
|
+module_exit(fini);
|
|
diff -Nurp linux-2.4.26-stock/net/ipv4/netfilter/regexp/regexp.c linux-2.4.26-layer7-clean/net/ipv4/netfilter/regexp/regexp.c
|
|
--- linux-2.4.26-stock/net/ipv4/netfilter/regexp/regexp.c 1969-12-31 18:00:00.000000000 -0600
|
|
+++ linux-2.4.26-layer7-clean/net/ipv4/netfilter/regexp/regexp.c 2004-06-27 19:07:00.000000000 -0500
|
|
@@ -0,0 +1,1195 @@
|
|
+/*
|
|
+ * regcomp and regexec -- regsub and regerror are elsewhere
|
|
+ * @(#)regexp.c 1.3 of 18 April 87
|
|
+ *
|
|
+ * Copyright (c) 1986 by University of Toronto.
|
|
+ * Written by Henry Spencer. Not derived from licensed software.
|
|
+ *
|
|
+ * Permission is granted to anyone to use this software for any
|
|
+ * purpose on any computer system, and to redistribute it freely,
|
|
+ * subject to the following restrictions:
|
|
+ *
|
|
+ * 1. The author is not responsible for the consequences of use of
|
|
+ * this software, no matter how awful, even if they arise
|
|
+ * from defects in it.
|
|
+ *
|
|
+ * 2. The origin of this software must not be misrepresented, either
|
|
+ * by explicit claim or by omission.
|
|
+ *
|
|
+ * 3. Altered versions must be plainly marked as such, and must not
|
|
+ * be misrepresented as being the original software.
|
|
+ *
|
|
+ * Beware that some of this code is subtly aware of the way operator
|
|
+ * precedence is structured in regular expressions. Serious changes in
|
|
+ * regular-expression syntax might require a total rethink.
|
|
+ *
|
|
+ * This code was modified by Ethan Sommer to work within the kernel
|
|
+ * (it now uses kmalloc etc..)
|
|
+ *
|
|
+ * Modified slightly by Matthew Strait to use more modern C.
|
|
+ */
|
|
+
|
|
+#include "regexp.h"
|
|
+#include "regmagic.h"
|
|
+
|
|
+/* added by ethan and matt. Lets it work in both kernel and user space.
|
|
+(So iptables can use it, for instance.) Yea, it goes both ways... */
|
|
+#if __KERNEL__
|
|
+ #define malloc(foo) kmalloc(foo,GFP_ATOMIC)
|
|
+#else
|
|
+ #define printk(format,args...) printf(format,##args)
|
|
+#endif
|
|
+
|
|
+void regerror(char * s)
|
|
+{
|
|
+ printk("<3>Regexp: %s\n", s);
|
|
+ /* NOTREACHED */
|
|
+}
|
|
+
|
|
+/*
|
|
+ * The "internal use only" fields in regexp.h are present to pass info from
|
|
+ * compile to execute that permits the execute phase to run lots faster on
|
|
+ * simple cases. They are:
|
|
+ *
|
|
+ * regstart char that must begin a match; '\0' if none obvious
|
|
+ * reganch is the match anchored (at beginning-of-line only)?
|
|
+ * regmust string (pointer into program) that match must include, or NULL
|
|
+ * regmlen length of regmust string
|
|
+ *
|
|
+ * Regstart and reganch permit very fast decisions on suitable starting points
|
|
+ * for a match, cutting down the work a lot. Regmust permits fast rejection
|
|
+ * of lines that cannot possibly match. The regmust tests are costly enough
|
|
+ * that regcomp() supplies a regmust only if the r.e. contains something
|
|
+ * potentially expensive (at present, the only such thing detected is * or +
|
|
+ * at the start of the r.e., which can involve a lot of backup). Regmlen is
|
|
+ * supplied because the test in regexec() needs it and regcomp() is computing
|
|
+ * it anyway.
|
|
+ */
|
|
+
|
|
+/*
|
|
+ * Structure for regexp "program". This is essentially a linear encoding
|
|
+ * of a nondeterministic finite-state machine (aka syntax charts or
|
|
+ * "railroad normal form" in parsing technology). Each node is an opcode
|
|
+ * plus a "next" pointer, possibly plus an operand. "Next" pointers of
|
|
+ * all nodes except BRANCH implement concatenation; a "next" pointer with
|
|
+ * a BRANCH on both ends of it is connecting two alternatives. (Here we
|
|
+ * have one of the subtle syntax dependencies: an individual BRANCH (as
|
|
+ * opposed to a collection of them) is never concatenated with anything
|
|
+ * because of operator precedence.) The operand of some types of node is
|
|
+ * a literal string; for others, it is a node leading into a sub-FSM. In
|
|
+ * particular, the operand of a BRANCH node is the first node of the branch.
|
|
+ * (NB this is *not* a tree structure: the tail of the branch connects
|
|
+ * to the thing following the set of BRANCHes.) The opcodes are:
|
|
+ */
|
|
+
|
|
+/* definition number opnd? meaning */
|
|
+#define END 0 /* no End of program. */
|
|
+#define BOL 1 /* no Match "" at beginning of line. */
|
|
+#define EOL 2 /* no Match "" at end of line. */
|
|
+#define ANY 3 /* no Match any one character. */
|
|
+#define ANYOF 4 /* str Match any character in this string. */
|
|
+#define ANYBUT 5 /* str Match any character not in this string. */
|
|
+#define BRANCH 6 /* node Match this alternative, or the next... */
|
|
+#define BACK 7 /* no Match "", "next" ptr points backward. */
|
|
+#define EXACTLY 8 /* str Match this string. */
|
|
+#define NOTHING 9 /* no Match empty string. */
|
|
+#define STAR 10 /* node Match this (simple) thing 0 or more times. */
|
|
+#define PLUS 11 /* node Match this (simple) thing 1 or more times. */
|
|
+#define OPEN 20 /* no Mark this point in input as start of #n. */
|
|
+ /* OPEN+1 is number 1, etc. */
|
|
+#define CLOSE 30 /* no Analogous to OPEN. */
|
|
+
|
|
+/*
|
|
+ * Opcode notes:
|
|
+ *
|
|
+ * BRANCH The set of branches constituting a single choice are hooked
|
|
+ * together with their "next" pointers, since precedence prevents
|
|
+ * anything being concatenated to any individual branch. The
|
|
+ * "next" pointer of the last BRANCH in a choice points to the
|
|
+ * thing following the whole choice. This is also where the
|
|
+ * final "next" pointer of each individual branch points; each
|
|
+ * branch starts with the operand node of a BRANCH node.
|
|
+ *
|
|
+ * BACK Normal "next" pointers all implicitly point forward; BACK
|
|
+ * exists to make loop structures possible.
|
|
+ *
|
|
+ * STAR,PLUS '?', and complex '*' and '+', are implemented as circular
|
|
+ * BRANCH structures using BACK. Simple cases (one character
|
|
+ * per match) are implemented with STAR and PLUS for speed
|
|
+ * and to minimize recursive plunges.
|
|
+ *
|
|
+ * OPEN,CLOSE ...are numbered at compile time.
|
|
+ */
|
|
+
|
|
+/*
|
|
+ * A node is one char of opcode followed by two chars of "next" pointer.
|
|
+ * "Next" pointers are stored as two 8-bit pieces, high order first. The
|
|
+ * value is a positive offset from the opcode of the node containing it.
|
|
+ * An operand, if any, simply follows the node. (Note that much of the
|
|
+ * code generation knows about this implicit relationship.)
|
|
+ *
|
|
+ * Using two bytes for the "next" pointer is vast overkill for most things,
|
|
+ * but allows patterns to get big without disasters.
|
|
+ */
|
|
+#define OP(p) (*(p))
|
|
+#define NEXT(p) (((*((p)+1)&0377)<<8) + (*((p)+2)&0377))
|
|
+#define OPERAND(p) ((p) + 3)
|
|
+
|
|
+/*
|
|
+ * See regmagic.h for one further detail of program structure.
|
|
+ */
|
|
+
|
|
+
|
|
+/*
|
|
+ * Utility definitions.
|
|
+ */
|
|
+#ifndef CHARBITS
|
|
+#define UCHARAT(p) ((int)*(unsigned char *)(p))
|
|
+#else
|
|
+#define UCHARAT(p) ((int)*(p)&CHARBITS)
|
|
+#endif
|
|
+
|
|
+#define FAIL(m) { regerror(m); return(NULL); }
|
|
+#define ISMULT(c) ((c) == '*' || (c) == '+' || (c) == '?')
|
|
+#define META "^$.[()|?+*\\"
|
|
+
|
|
+/*
|
|
+ * Flags to be passed up and down.
|
|
+ */
|
|
+#define HASWIDTH 01 /* Known never to match null string. */
|
|
+#define SIMPLE 02 /* Simple enough to be STAR/PLUS operand. */
|
|
+#define SPSTART 04 /* Starts with * or +. */
|
|
+#define WORST 0 /* Worst case. */
|
|
+
|
|
+/*
|
|
+ * Global work variables for regcomp().
|
|
+ */
|
|
+static char *regparse; /* Input-scan pointer. */
|
|
+static int regnpar; /* () count. */
|
|
+static char regdummy;
|
|
+static char *regcode; /* Code-emit pointer; ®dummy = don't. */
|
|
+static long regsize; /* Code size. */
|
|
+
|
|
+/*
|
|
+ * Forward declarations for regcomp()'s friends.
|
|
+ */
|
|
+#ifndef STATIC
|
|
+#define STATIC static
|
|
+#endif
|
|
+STATIC char *reg(int paren,int *flagp);
|
|
+STATIC char *regbranch(int *flagp);
|
|
+STATIC char *regpiece(int *flagp);
|
|
+STATIC char *regatom(int *flagp);
|
|
+STATIC char *regnode(char op);
|
|
+STATIC char *regnext(char *p);
|
|
+STATIC void regc(char b);
|
|
+STATIC void reginsert(char op, char *opnd);
|
|
+STATIC void regtail(char *p, char *val);
|
|
+STATIC void regoptail(char *p, char *val);
|
|
+
|
|
+
|
|
+__kernel_size_t my_strcspn(const char *s1,const char *s2)
|
|
+{
|
|
+ char *scan1;
|
|
+ char *scan2;
|
|
+ int count;
|
|
+
|
|
+ count = 0;
|
|
+ for (scan1 = (char *)s1; *scan1 != '\0'; scan1++) {
|
|
+ for (scan2 = (char *)s2; *scan2 != '\0';) /* ++ moved down. */
|
|
+ if (*scan1 == *scan2++)
|
|
+ return(count);
|
|
+ count++;
|
|
+ }
|
|
+ return(count);
|
|
+}
|
|
+
|
|
+/*
|
|
+ - regcomp - compile a regular expression into internal code
|
|
+ *
|
|
+ * We can't allocate space until we know how big the compiled form will be,
|
|
+ * but we can't compile it (and thus know how big it is) until we've got a
|
|
+ * place to put the code. So we cheat: we compile it twice, once with code
|
|
+ * generation turned off and size counting turned on, and once "for real".
|
|
+ * This also means that we don't allocate space until we are sure that the
|
|
+ * thing really will compile successfully, and we never have to move the
|
|
+ * code and thus invalidate pointers into it. (Note that it has to be in
|
|
+ * one piece because free() must be able to free it all.)
|
|
+ *
|
|
+ * Beware that the optimization-preparation code in here knows about some
|
|
+ * of the structure of the compiled regexp.
|
|
+ */
|
|
+regexp *
|
|
+regcomp(char *exp,int *patternsize)
|
|
+{
|
|
+ register regexp *r;
|
|
+ register char *scan;
|
|
+ register char *longest;
|
|
+ register int len;
|
|
+ int flags;
|
|
+ /* commented out by ethan
|
|
+ extern char *malloc();
|
|
+ */
|
|
+
|
|
+ if (exp == NULL)
|
|
+ FAIL("NULL argument");
|
|
+
|
|
+ /* First pass: determine size, legality. */
|
|
+ regparse = exp;
|
|
+ regnpar = 1;
|
|
+ regsize = 0L;
|
|
+ regcode = ®dummy;
|
|
+ regc(MAGIC);
|
|
+ if (reg(0, &flags) == NULL)
|
|
+ return(NULL);
|
|
+
|
|
+ /* Small enough for pointer-storage convention? */
|
|
+ if (regsize >= 32767L) /* Probably could be 65535L. */
|
|
+ FAIL("regexp too big");
|
|
+
|
|
+ /* Allocate space. */
|
|
+ *patternsize=sizeof(regexp) + (unsigned)regsize;
|
|
+ r = (regexp *)malloc(sizeof(regexp) + (unsigned)regsize);
|
|
+ if (r == NULL)
|
|
+ FAIL("out of space");
|
|
+
|
|
+ /* Second pass: emit code. */
|
|
+ regparse = exp;
|
|
+ regnpar = 1;
|
|
+ regcode = r->program;
|
|
+ regc(MAGIC);
|
|
+ if (reg(0, &flags) == NULL)
|
|
+ return(NULL);
|
|
+
|
|
+ /* Dig out information for optimizations. */
|
|
+ r->regstart = '\0'; /* Worst-case defaults. */
|
|
+ r->reganch = 0;
|
|
+ r->regmust = NULL;
|
|
+ r->regmlen = 0;
|
|
+ scan = r->program+1; /* First BRANCH. */
|
|
+ if (OP(regnext(scan)) == END) { /* Only one top-level choice. */
|
|
+ scan = OPERAND(scan);
|
|
+
|
|
+ /* Starting-point info. */
|
|
+ if (OP(scan) == EXACTLY)
|
|
+ r->regstart = *OPERAND(scan);
|
|
+ else if (OP(scan) == BOL)
|
|
+ r->reganch++;
|
|
+
|
|
+ /*
|
|
+ * If there's something expensive in the r.e., find the
|
|
+ * longest literal string that must appear and make it the
|
|
+ * regmust. Resolve ties in favor of later strings, since
|
|
+ * the regstart check works with the beginning of the r.e.
|
|
+ * and avoiding duplication strengthens checking. Not a
|
|
+ * strong reason, but sufficient in the absence of others.
|
|
+ */
|
|
+ if (flags&SPSTART) {
|
|
+ longest = NULL;
|
|
+ len = 0;
|
|
+ for (; scan != NULL; scan = regnext(scan))
|
|
+ if (OP(scan) == EXACTLY && strlen(OPERAND(scan)) >= len) {
|
|
+ longest = OPERAND(scan);
|
|
+ len = strlen(OPERAND(scan));
|
|
+ }
|
|
+ r->regmust = longest;
|
|
+ r->regmlen = len;
|
|
+ }
|
|
+ }
|
|
+
|
|
+ return(r);
|
|
+}
|
|
+
|
|
+/*
|
|
+ - reg - regular expression, i.e. main body or parenthesized thing
|
|
+ *
|
|
+ * Caller must absorb opening parenthesis.
|
|
+ *
|
|
+ * Combining parenthesis handling with the base level of regular expression
|
|
+ * is a trifle forced, but the need to tie the tails of the branches to what
|
|
+ * follows makes it hard to avoid.
|
|
+ */
|
|
+static char *
|
|
+reg(int paren, int *flagp /* Parenthesized? */ )
|
|
+{
|
|
+ register char *ret;
|
|
+ register char *br;
|
|
+ register char *ender;
|
|
+ register int parno = 0; /* 0 makes gcc happy */
|
|
+ int flags;
|
|
+
|
|
+ *flagp = HASWIDTH; /* Tentatively. */
|
|
+
|
|
+ /* Make an OPEN node, if parenthesized. */
|
|
+ if (paren) {
|
|
+ if (regnpar >= NSUBEXP)
|
|
+ FAIL("too many ()");
|
|
+ parno = regnpar;
|
|
+ regnpar++;
|
|
+ ret = regnode(OPEN+parno);
|
|
+ } else
|
|
+ ret = NULL;
|
|
+
|
|
+ /* Pick up the branches, linking them together. */
|
|
+ br = regbranch(&flags);
|
|
+ if (br == NULL)
|
|
+ return(NULL);
|
|
+ if (ret != NULL)
|
|
+ regtail(ret, br); /* OPEN -> first. */
|
|
+ else
|
|
+ ret = br;
|
|
+ if (!(flags&HASWIDTH))
|
|
+ *flagp &= ~HASWIDTH;
|
|
+ *flagp |= flags&SPSTART;
|
|
+ while (*regparse == '|') {
|
|
+ regparse++;
|
|
+ br = regbranch(&flags);
|
|
+ if (br == NULL)
|
|
+ return(NULL);
|
|
+ regtail(ret, br); /* BRANCH -> BRANCH. */
|
|
+ if (!(flags&HASWIDTH))
|
|
+ *flagp &= ~HASWIDTH;
|
|
+ *flagp |= flags&SPSTART;
|
|
+ }
|
|
+
|
|
+ /* Make a closing node, and hook it on the end. */
|
|
+ ender = regnode((paren) ? CLOSE+parno : END);
|
|
+ regtail(ret, ender);
|
|
+
|
|
+ /* Hook the tails of the branches to the closing node. */
|
|
+ for (br = ret; br != NULL; br = regnext(br))
|
|
+ regoptail(br, ender);
|
|
+
|
|
+ /* Check for proper termination. */
|
|
+ if (paren && *regparse++ != ')') {
|
|
+ FAIL("unmatched ()");
|
|
+ } else if (!paren && *regparse != '\0') {
|
|
+ if (*regparse == ')') {
|
|
+ FAIL("unmatched ()");
|
|
+ } else
|
|
+ FAIL("junk on end"); /* "Can't happen". */
|
|
+ /* NOTREACHED */
|
|
+ }
|
|
+
|
|
+ return(ret);
|
|
+}
|
|
+
|
|
+/*
|
|
+ - regbranch - one alternative of an | operator
|
|
+ *
|
|
+ * Implements the concatenation operator.
|
|
+ */
|
|
+static char *
|
|
+regbranch(int *flagp)
|
|
+{
|
|
+ register char *ret;
|
|
+ register char *chain;
|
|
+ register char *latest;
|
|
+ int flags;
|
|
+
|
|
+ *flagp = WORST; /* Tentatively. */
|
|
+
|
|
+ ret = regnode(BRANCH);
|
|
+ chain = NULL;
|
|
+ while (*regparse != '\0' && *regparse != '|' && *regparse != ')') {
|
|
+ latest = regpiece(&flags);
|
|
+ if (latest == NULL)
|
|
+ return(NULL);
|
|
+ *flagp |= flags&HASWIDTH;
|
|
+ if (chain == NULL) /* First piece. */
|
|
+ *flagp |= flags&SPSTART;
|
|
+ else
|
|
+ regtail(chain, latest);
|
|
+ chain = latest;
|
|
+ }
|
|
+ if (chain == NULL) /* Loop ran zero times. */
|
|
+ (void) regnode(NOTHING);
|
|
+
|
|
+ return(ret);
|
|
+}
|
|
+
|
|
+/*
|
|
+ - regpiece - something followed by possible [*+?]
|
|
+ *
|
|
+ * Note that the branching code sequences used for ? and the general cases
|
|
+ * of * and + are somewhat optimized: they use the same NOTHING node as
|
|
+ * both the endmarker for their branch list and the body of the last branch.
|
|
+ * It might seem that this node could be dispensed with entirely, but the
|
|
+ * endmarker role is not redundant.
|
|
+ */
|
|
+static char *
|
|
+regpiece(int *flagp)
|
|
+{
|
|
+ register char *ret;
|
|
+ register char op;
|
|
+ register char *next;
|
|
+ int flags;
|
|
+
|
|
+ ret = regatom(&flags);
|
|
+ if (ret == NULL)
|
|
+ return(NULL);
|
|
+
|
|
+ op = *regparse;
|
|
+ if (!ISMULT(op)) {
|
|
+ *flagp = flags;
|
|
+ return(ret);
|
|
+ }
|
|
+
|
|
+ if (!(flags&HASWIDTH) && op != '?')
|
|
+ FAIL("*+ operand could be empty");
|
|
+ *flagp = (op != '+') ? (WORST|SPSTART) : (WORST|HASWIDTH);
|
|
+
|
|
+ if (op == '*' && (flags&SIMPLE))
|
|
+ reginsert(STAR, ret);
|
|
+ else if (op == '*') {
|
|
+ /* Emit x* as (x&|), where & means "self". */
|
|
+ reginsert(BRANCH, ret); /* Either x */
|
|
+ regoptail(ret, regnode(BACK)); /* and loop */
|
|
+ regoptail(ret, ret); /* back */
|
|
+ regtail(ret, regnode(BRANCH)); /* or */
|
|
+ regtail(ret, regnode(NOTHING)); /* null. */
|
|
+ } else if (op == '+' && (flags&SIMPLE))
|
|
+ reginsert(PLUS, ret);
|
|
+ else if (op == '+') {
|
|
+ /* Emit x+ as x(&|), where & means "self". */
|
|
+ next = regnode(BRANCH); /* Either */
|
|
+ regtail(ret, next);
|
|
+ regtail(regnode(BACK), ret); /* loop back */
|
|
+ regtail(next, regnode(BRANCH)); /* or */
|
|
+ regtail(ret, regnode(NOTHING)); /* null. */
|
|
+ } else if (op == '?') {
|
|
+ /* Emit x? as (x|) */
|
|
+ reginsert(BRANCH, ret); /* Either x */
|
|
+ regtail(ret, regnode(BRANCH)); /* or */
|
|
+ next = regnode(NOTHING); /* null. */
|
|
+ regtail(ret, next);
|
|
+ regoptail(ret, next);
|
|
+ }
|
|
+ regparse++;
|
|
+ if (ISMULT(*regparse))
|
|
+ FAIL("nested *?+");
|
|
+
|
|
+ return(ret);
|
|
+}
|
|
+
|
|
+/*
|
|
+ - regatom - the lowest level
|
|
+ *
|
|
+ * Optimization: gobbles an entire sequence of ordinary characters so that
|
|
+ * it can turn them into a single node, which is smaller to store and
|
|
+ * faster to run. Backslashed characters are exceptions, each becoming a
|
|
+ * separate node; the code is simpler that way and it's not worth fixing.
|
|
+ */
|
|
+static char *
|
|
+regatom(int *flagp)
|
|
+{
|
|
+ register char *ret;
|
|
+ int flags;
|
|
+
|
|
+ *flagp = WORST; /* Tentatively. */
|
|
+
|
|
+ switch (*regparse++) {
|
|
+ case '^':
|
|
+ ret = regnode(BOL);
|
|
+ break;
|
|
+ case '$':
|
|
+ ret = regnode(EOL);
|
|
+ break;
|
|
+ case '.':
|
|
+ ret = regnode(ANY);
|
|
+ *flagp |= HASWIDTH|SIMPLE;
|
|
+ break;
|
|
+ case '[': {
|
|
+ register int class;
|
|
+ register int classend;
|
|
+
|
|
+ if (*regparse == '^') { /* Complement of range. */
|
|
+ ret = regnode(ANYBUT);
|
|
+ regparse++;
|
|
+ } else
|
|
+ ret = regnode(ANYOF);
|
|
+ if (*regparse == ']' || *regparse == '-')
|
|
+ regc(*regparse++);
|
|
+ while (*regparse != '\0' && *regparse != ']') {
|
|
+ if (*regparse == '-') {
|
|
+ regparse++;
|
|
+ if (*regparse == ']' || *regparse == '\0')
|
|
+ regc('-');
|
|
+ else {
|
|
+ class = UCHARAT(regparse-2)+1;
|
|
+ classend = UCHARAT(regparse);
|
|
+ if (class > classend+1)
|
|
+ FAIL("invalid [] range");
|
|
+ for (; class <= classend; class++)
|
|
+ regc(class);
|
|
+ regparse++;
|
|
+ }
|
|
+ } else
|
|
+ regc(*regparse++);
|
|
+ }
|
|
+ regc('\0');
|
|
+ if (*regparse != ']')
|
|
+ FAIL("unmatched []");
|
|
+ regparse++;
|
|
+ *flagp |= HASWIDTH|SIMPLE;
|
|
+ }
|
|
+ break;
|
|
+ case '(':
|
|
+ ret = reg(1, &flags);
|
|
+ if (ret == NULL)
|
|
+ return(NULL);
|
|
+ *flagp |= flags&(HASWIDTH|SPSTART);
|
|
+ break;
|
|
+ case '\0':
|
|
+ case '|':
|
|
+ case ')':
|
|
+ FAIL("internal urp"); /* Supposed to be caught earlier. */
|
|
+ break;
|
|
+ case '?':
|
|
+ case '+':
|
|
+ case '*':
|
|
+ FAIL("?+* follows nothing");
|
|
+ break;
|
|
+ case '\\':
|
|
+ if (*regparse == '\0')
|
|
+ FAIL("trailing \\");
|
|
+ ret = regnode(EXACTLY);
|
|
+ regc(*regparse++);
|
|
+ regc('\0');
|
|
+ *flagp |= HASWIDTH|SIMPLE;
|
|
+ break;
|
|
+ default: {
|
|
+ register int len;
|
|
+ register char ender;
|
|
+
|
|
+ regparse--;
|
|
+ len = my_strcspn((const char *)regparse, (const char *)META);
|
|
+ if (len <= 0)
|
|
+ FAIL("internal disaster");
|
|
+ ender = *(regparse+len);
|
|
+ if (len > 1 && ISMULT(ender))
|
|
+ len--; /* Back off clear of ?+* operand. */
|
|
+ *flagp |= HASWIDTH;
|
|
+ if (len == 1)
|
|
+ *flagp |= SIMPLE;
|
|
+ ret = regnode(EXACTLY);
|
|
+ while (len > 0) {
|
|
+ regc(*regparse++);
|
|
+ len--;
|
|
+ }
|
|
+ regc('\0');
|
|
+ }
|
|
+ break;
|
|
+ }
|
|
+
|
|
+ return(ret);
|
|
+}
|
|
+
|
|
+/*
|
|
+ - regnode - emit a node
|
|
+ */
|
|
+static char * /* Location. */
|
|
+regnode(char op)
|
|
+{
|
|
+ register char *ret;
|
|
+ register char *ptr;
|
|
+
|
|
+ ret = regcode;
|
|
+ if (ret == ®dummy) {
|
|
+ regsize += 3;
|
|
+ return(ret);
|
|
+ }
|
|
+
|
|
+ ptr = ret;
|
|
+ *ptr++ = op;
|
|
+ *ptr++ = '\0'; /* Null "next" pointer. */
|
|
+ *ptr++ = '\0';
|
|
+ regcode = ptr;
|
|
+
|
|
+ return(ret);
|
|
+}
|
|
+
|
|
+/*
|
|
+ - regc - emit (if appropriate) a byte of code
|
|
+ */
|
|
+static void
|
|
+regc(char b)
|
|
+{
|
|
+ if (regcode != ®dummy)
|
|
+ *regcode++ = b;
|
|
+ else
|
|
+ regsize++;
|
|
+}
|
|
+
|
|
+/*
|
|
+ - reginsert - insert an operator in front of already-emitted operand
|
|
+ *
|
|
+ * Means relocating the operand.
|
|
+ */
|
|
+static void
|
|
+reginsert(char op, char* opnd)
|
|
+{
|
|
+ register char *src;
|
|
+ register char *dst;
|
|
+ register char *place;
|
|
+
|
|
+ if (regcode == ®dummy) {
|
|
+ regsize += 3;
|
|
+ return;
|
|
+ }
|
|
+
|
|
+ src = regcode;
|
|
+ regcode += 3;
|
|
+ dst = regcode;
|
|
+ while (src > opnd)
|
|
+ *--dst = *--src;
|
|
+
|
|
+ place = opnd; /* Op node, where operand used to be. */
|
|
+ *place++ = op;
|
|
+ *place++ = '\0';
|
|
+ *place++ = '\0';
|
|
+}
|
|
+
|
|
+/*
|
|
+ - regtail - set the next-pointer at the end of a node chain
|
|
+ */
|
|
+static void
|
|
+regtail(char *p, char *val)
|
|
+{
|
|
+ register char *scan;
|
|
+ register char *temp;
|
|
+ register int offset;
|
|
+
|
|
+ if (p == ®dummy)
|
|
+ return;
|
|
+
|
|
+ /* Find last node. */
|
|
+ scan = p;
|
|
+ for (;;) {
|
|
+ temp = regnext(scan);
|
|
+ if (temp == NULL)
|
|
+ break;
|
|
+ scan = temp;
|
|
+ }
|
|
+
|
|
+ if (OP(scan) == BACK)
|
|
+ offset = scan - val;
|
|
+ else
|
|
+ offset = val - scan;
|
|
+ *(scan+1) = (offset>>8)&0377;
|
|
+ *(scan+2) = offset&0377;
|
|
+}
|
|
+
|
|
+/*
|
|
+ - regoptail - regtail on operand of first argument; nop if operandless
|
|
+ */
|
|
+static void
|
|
+regoptail(char *p, char *val)
|
|
+{
|
|
+ /* "Operandless" and "op != BRANCH" are synonymous in practice. */
|
|
+ if (p == NULL || p == ®dummy || OP(p) != BRANCH)
|
|
+ return;
|
|
+ regtail(OPERAND(p), val);
|
|
+}
|
|
+
|
|
+/*
|
|
+ * regexec and friends
|
|
+ */
|
|
+
|
|
+/*
|
|
+ * Global work variables for regexec().
|
|
+ */
|
|
+static char *reginput; /* String-input pointer. */
|
|
+static char *regbol; /* Beginning of input, for ^ check. */
|
|
+static char **regstartp; /* Pointer to startp array. */
|
|
+static char **regendp; /* Ditto for endp. */
|
|
+
|
|
+/*
|
|
+ * Forwards.
|
|
+ */
|
|
+STATIC int regtry(regexp *prog, char *string);
|
|
+STATIC int regmatch(char *prog);
|
|
+STATIC int regrepeat(char *p);
|
|
+
|
|
+#ifdef DEBUG
|
|
+int regnarrate = 0;
|
|
+void regdump();
|
|
+STATIC char *regprop(char *op);
|
|
+#endif
|
|
+
|
|
+/*
|
|
+ - regexec - match a regexp against a string
|
|
+ */
|
|
+int
|
|
+regexec(regexp *prog, char *string)
|
|
+{
|
|
+ register char *s;
|
|
+
|
|
+ /* Be paranoid... */
|
|
+ if (prog == NULL || string == NULL) {
|
|
+ printk("<3>Regexp: NULL parameter\n");
|
|
+ return(0);
|
|
+ }
|
|
+
|
|
+ /* Check validity of program. */
|
|
+ if (UCHARAT(prog->program) != MAGIC) {
|
|
+ printk("<3>Regexp: corrupted program\n");
|
|
+ return(0);
|
|
+ }
|
|
+
|
|
+ /* If there is a "must appear" string, look for it. */
|
|
+ if (prog->regmust != NULL) {
|
|
+ s = string;
|
|
+ while ((s = strchr(s, prog->regmust[0])) != NULL) {
|
|
+ if (strncmp(s, prog->regmust, prog->regmlen) == 0)
|
|
+ break; /* Found it. */
|
|
+ s++;
|
|
+ }
|
|
+ if (s == NULL) /* Not present. */
|
|
+ return(0);
|
|
+ }
|
|
+
|
|
+ /* Mark beginning of line for ^ . */
|
|
+ regbol = string;
|
|
+
|
|
+ /* Simplest case: anchored match need be tried only once. */
|
|
+ if (prog->reganch)
|
|
+ return(regtry(prog, string));
|
|
+
|
|
+ /* Messy cases: unanchored match. */
|
|
+ s = string;
|
|
+ if (prog->regstart != '\0')
|
|
+ /* We know what char it must start with. */
|
|
+ while ((s = strchr(s, prog->regstart)) != NULL) {
|
|
+ if (regtry(prog, s))
|
|
+ return(1);
|
|
+ s++;
|
|
+ }
|
|
+ else
|
|
+ /* We don't -- general case. */
|
|
+ do {
|
|
+ if (regtry(prog, s))
|
|
+ return(1);
|
|
+ } while (*s++ != '\0');
|
|
+
|
|
+ /* Failure. */
|
|
+ return(0);
|
|
+}
|
|
+
|
|
+/*
|
|
+ - regtry - try match at specific point
|
|
+ */
|
|
+static int /* 0 failure, 1 success */
|
|
+regtry(regexp *prog, char *string)
|
|
+{
|
|
+ register int i;
|
|
+ register char **sp;
|
|
+ register char **ep;
|
|
+
|
|
+ reginput = string;
|
|
+ regstartp = prog->startp;
|
|
+ regendp = prog->endp;
|
|
+
|
|
+ sp = prog->startp;
|
|
+ ep = prog->endp;
|
|
+ for (i = NSUBEXP; i > 0; i--) {
|
|
+ *sp++ = NULL;
|
|
+ *ep++ = NULL;
|
|
+ }
|
|
+ if (regmatch(prog->program + 1)) {
|
|
+ prog->startp[0] = string;
|
|
+ prog->endp[0] = reginput;
|
|
+ return(1);
|
|
+ } else
|
|
+ return(0);
|
|
+}
|
|
+
|
|
+/*
|
|
+ - regmatch - main matching routine
|
|
+ *
|
|
+ * Conceptually the strategy is simple: check to see whether the current
|
|
+ * node matches, call self recursively to see whether the rest matches,
|
|
+ * and then act accordingly. In practice we make some effort to avoid
|
|
+ * recursion, in particular by going through "ordinary" nodes (that don't
|
|
+ * need to know whether the rest of the match failed) by a loop instead of
|
|
+ * by recursion.
|
|
+ */
|
|
+static int /* 0 failure, 1 success */
|
|
+regmatch(char *prog)
|
|
+{
|
|
+ register char *scan = prog; /* Current node. */
|
|
+ char *next; /* Next node. */
|
|
+
|
|
+#ifdef DEBUG
|
|
+ if (scan != NULL && regnarrate)
|
|
+ fprintf(stderr, "%s(\n", regprop(scan));
|
|
+#endif
|
|
+ while (scan != NULL) {
|
|
+#ifdef DEBUG
|
|
+ if (regnarrate)
|
|
+ fprintf(stderr, "%s...\n", regprop(scan));
|
|
+#endif
|
|
+ next = regnext(scan);
|
|
+
|
|
+ switch (OP(scan)) {
|
|
+ case BOL:
|
|
+ if (reginput != regbol)
|
|
+ return(0);
|
|
+ break;
|
|
+ case EOL:
|
|
+ if (*reginput != '\0')
|
|
+ return(0);
|
|
+ break;
|
|
+ case ANY:
|
|
+ if (*reginput == '\0')
|
|
+ return(0);
|
|
+ reginput++;
|
|
+ break;
|
|
+ case EXACTLY: {
|
|
+ register int len;
|
|
+ register char *opnd;
|
|
+
|
|
+ opnd = OPERAND(scan);
|
|
+ /* Inline the first character, for speed. */
|
|
+ if (*opnd != *reginput)
|
|
+ return(0);
|
|
+ len = strlen(opnd);
|
|
+ if (len > 1 && strncmp(opnd, reginput, len) != 0)
|
|
+ return(0);
|
|
+ reginput += len;
|
|
+ }
|
|
+ break;
|
|
+ case ANYOF:
|
|
+ if (*reginput == '\0' || strchr(OPERAND(scan), *reginput) == NULL)
|
|
+ return(0);
|
|
+ reginput++;
|
|
+ break;
|
|
+ case ANYBUT:
|
|
+ if (*reginput == '\0' || strchr(OPERAND(scan), *reginput) != NULL)
|
|
+ return(0);
|
|
+ reginput++;
|
|
+ break;
|
|
+ case NOTHING:
|
|
+ case BACK:
|
|
+ break;
|
|
+ case OPEN+1:
|
|
+ case OPEN+2:
|
|
+ case OPEN+3:
|
|
+ case OPEN+4:
|
|
+ case OPEN+5:
|
|
+ case OPEN+6:
|
|
+ case OPEN+7:
|
|
+ case OPEN+8:
|
|
+ case OPEN+9: {
|
|
+ register int no;
|
|
+ register char *save;
|
|
+
|
|
+ no = OP(scan) - OPEN;
|
|
+ save = reginput;
|
|
+
|
|
+ if (regmatch(next)) {
|
|
+ /*
|
|
+ * Don't set startp if some later
|
|
+ * invocation of the same parentheses
|
|
+ * already has.
|
|
+ */
|
|
+ if (regstartp[no] == NULL)
|
|
+ regstartp[no] = save;
|
|
+ return(1);
|
|
+ } else
|
|
+ return(0);
|
|
+ }
|
|
+ break;
|
|
+ case CLOSE+1:
|
|
+ case CLOSE+2:
|
|
+ case CLOSE+3:
|
|
+ case CLOSE+4:
|
|
+ case CLOSE+5:
|
|
+ case CLOSE+6:
|
|
+ case CLOSE+7:
|
|
+ case CLOSE+8:
|
|
+ case CLOSE+9:
|
|
+ {
|
|
+ register int no;
|
|
+ register char *save;
|
|
+
|
|
+ no = OP(scan) - CLOSE;
|
|
+ save = reginput;
|
|
+
|
|
+ if (regmatch(next)) {
|
|
+ /*
|
|
+ * Don't set endp if some later
|
|
+ * invocation of the same parentheses
|
|
+ * already has.
|
|
+ */
|
|
+ if (regendp[no] == NULL)
|
|
+ regendp[no] = save;
|
|
+ return(1);
|
|
+ } else
|
|
+ return(0);
|
|
+ }
|
|
+ break;
|
|
+ case BRANCH: {
|
|
+ register char *save;
|
|
+
|
|
+ if (OP(next) != BRANCH) /* No choice. */
|
|
+ next = OPERAND(scan); /* Avoid recursion. */
|
|
+ else {
|
|
+ do {
|
|
+ save = reginput;
|
|
+ if (regmatch(OPERAND(scan)))
|
|
+ return(1);
|
|
+ reginput = save;
|
|
+ scan = regnext(scan);
|
|
+ } while (scan != NULL && OP(scan) == BRANCH);
|
|
+ return(0);
|
|
+ /* NOTREACHED */
|
|
+ }
|
|
+ }
|
|
+ break;
|
|
+ case STAR:
|
|
+ case PLUS: {
|
|
+ register char nextch;
|
|
+ register int no;
|
|
+ register char *save;
|
|
+ register int min;
|
|
+
|
|
+ /*
|
|
+ * Lookahead to avoid useless match attempts
|
|
+ * when we know what character comes next.
|
|
+ */
|
|
+ nextch = '\0';
|
|
+ if (OP(next) == EXACTLY)
|
|
+ nextch = *OPERAND(next);
|
|
+ min = (OP(scan) == STAR) ? 0 : 1;
|
|
+ save = reginput;
|
|
+ no = regrepeat(OPERAND(scan));
|
|
+ while (no >= min) {
|
|
+ /* If it could work, try it. */
|
|
+ if (nextch == '\0' || *reginput == nextch)
|
|
+ if (regmatch(next))
|
|
+ return(1);
|
|
+ /* Couldn't or didn't -- back up. */
|
|
+ no--;
|
|
+ reginput = save + no;
|
|
+ }
|
|
+ return(0);
|
|
+ }
|
|
+ break;
|
|
+ case END:
|
|
+ return(1); /* Success! */
|
|
+ break;
|
|
+ default:
|
|
+ printk("<3>Regexp: memory corruption\n");
|
|
+ return(0);
|
|
+ break;
|
|
+ }
|
|
+
|
|
+ scan = next;
|
|
+ }
|
|
+
|
|
+ /*
|
|
+ * We get here only if there's trouble -- normally "case END" is
|
|
+ * the terminating point.
|
|
+ */
|
|
+ printk("<3>Regexp: corrupted pointers\n");
|
|
+ return(0);
|
|
+}
|
|
+
|
|
+/*
|
|
+ - regrepeat - repeatedly match something simple, report how many
|
|
+ */
|
|
+static int
|
|
+regrepeat(char *p)
|
|
+{
|
|
+ register int count = 0;
|
|
+ register char *scan;
|
|
+ register char *opnd;
|
|
+
|
|
+ scan = reginput;
|
|
+ opnd = OPERAND(p);
|
|
+ switch (OP(p)) {
|
|
+ case ANY:
|
|
+ count = strlen(scan);
|
|
+ scan += count;
|
|
+ break;
|
|
+ case EXACTLY:
|
|
+ while (*opnd == *scan) {
|
|
+ count++;
|
|
+ scan++;
|
|
+ }
|
|
+ break;
|
|
+ case ANYOF:
|
|
+ while (*scan != '\0' && strchr(opnd, *scan) != NULL) {
|
|
+ count++;
|
|
+ scan++;
|
|
+ }
|
|
+ break;
|
|
+ case ANYBUT:
|
|
+ while (*scan != '\0' && strchr(opnd, *scan) == NULL) {
|
|
+ count++;
|
|
+ scan++;
|
|
+ }
|
|
+ break;
|
|
+ default: /* Oh dear. Called inappropriately. */
|
|
+ printk("<3>Regexp: internal foulup\n");
|
|
+ count = 0; /* Best compromise. */
|
|
+ break;
|
|
+ }
|
|
+ reginput = scan;
|
|
+
|
|
+ return(count);
|
|
+}
|
|
+
|
|
+/*
|
|
+ - regnext - dig the "next" pointer out of a node
|
|
+ */
|
|
+static char*
|
|
+regnext(char *p)
|
|
+{
|
|
+ register int offset;
|
|
+
|
|
+ if (p == ®dummy)
|
|
+ return(NULL);
|
|
+
|
|
+ offset = NEXT(p);
|
|
+ if (offset == 0)
|
|
+ return(NULL);
|
|
+
|
|
+ if (OP(p) == BACK)
|
|
+ return(p-offset);
|
|
+ else
|
|
+ return(p+offset);
|
|
+}
|
|
+
|
|
+#ifdef DEBUG
|
|
+
|
|
+STATIC char *regprop();
|
|
+
|
|
+/*
|
|
+ - regdump - dump a regexp onto stdout in vaguely comprehensible form
|
|
+ */
|
|
+void
|
|
+regdump(regexp *r)
|
|
+{
|
|
+ register char *s;
|
|
+ register char op = EXACTLY; /* Arbitrary non-END op. */
|
|
+ register char *next;
|
|
+ /* extern char *strchr(); */
|
|
+
|
|
+
|
|
+ s = r->program + 1;
|
|
+ while (op != END) { /* While that wasn't END last time... */
|
|
+ op = OP(s);
|
|
+ printf("%2d%s", s-r->program, regprop(s)); /* Where, what. */
|
|
+ next = regnext(s);
|
|
+ if (next == NULL) /* Next ptr. */
|
|
+ printf("(0)");
|
|
+ else
|
|
+ printf("(%d)", (s-r->program)+(next-s));
|
|
+ s += 3;
|
|
+ if (op == ANYOF || op == ANYBUT || op == EXACTLY) {
|
|
+ /* Literal string, where present. */
|
|
+ while (*s != '\0') {
|
|
+ putchar(*s);
|
|
+ s++;
|
|
+ }
|
|
+ s++;
|
|
+ }
|
|
+ putchar('\n');
|
|
+ }
|
|
+
|
|
+ /* Header fields of interest. */
|
|
+ if (r->regstart != '\0')
|
|
+ printf("start `%c' ", r->regstart);
|
|
+ if (r->reganch)
|
|
+ printf("anchored ");
|
|
+ if (r->regmust != NULL)
|
|
+ printf("must have \"%s\"", r->regmust);
|
|
+ printf("\n");
|
|
+}
|
|
+
|
|
+/*
|
|
+ - regprop - printable representation of opcode
|
|
+ */
|
|
+static char *
|
|
+regprop(char *op)
|
|
+{
|
|
+#define BUFLEN 50
|
|
+ register char *p;
|
|
+ static char buf[BUFLEN];
|
|
+
|
|
+ strcpy(buf, ":");
|
|
+
|
|
+ switch (OP(op)) {
|
|
+ case BOL:
|
|
+ p = "BOL";
|
|
+ break;
|
|
+ case EOL:
|
|
+ p = "EOL";
|
|
+ break;
|
|
+ case ANY:
|
|
+ p = "ANY";
|
|
+ break;
|
|
+ case ANYOF:
|
|
+ p = "ANYOF";
|
|
+ break;
|
|
+ case ANYBUT:
|
|
+ p = "ANYBUT";
|
|
+ break;
|
|
+ case BRANCH:
|
|
+ p = "BRANCH";
|
|
+ break;
|
|
+ case EXACTLY:
|
|
+ p = "EXACTLY";
|
|
+ break;
|
|
+ case NOTHING:
|
|
+ p = "NOTHING";
|
|
+ break;
|
|
+ case BACK:
|
|
+ p = "BACK";
|
|
+ break;
|
|
+ case END:
|
|
+ p = "END";
|
|
+ break;
|
|
+ case OPEN+1:
|
|
+ case OPEN+2:
|
|
+ case OPEN+3:
|
|
+ case OPEN+4:
|
|
+ case OPEN+5:
|
|
+ case OPEN+6:
|
|
+ case OPEN+7:
|
|
+ case OPEN+8:
|
|
+ case OPEN+9:
|
|
+ snprintf(buf+strlen(buf),BUFLEN-strlen(buf), "OPEN%d", OP(op)-OPEN);
|
|
+ p = NULL;
|
|
+ break;
|
|
+ case CLOSE+1:
|
|
+ case CLOSE+2:
|
|
+ case CLOSE+3:
|
|
+ case CLOSE+4:
|
|
+ case CLOSE+5:
|
|
+ case CLOSE+6:
|
|
+ case CLOSE+7:
|
|
+ case CLOSE+8:
|
|
+ case CLOSE+9:
|
|
+ snprintf(buf+strlen(buf),BUFLEN-strlen(buf), "CLOSE%d", OP(op)-CLOSE);
|
|
+ p = NULL;
|
|
+ break;
|
|
+ case STAR:
|
|
+ p = "STAR";
|
|
+ break;
|
|
+ case PLUS:
|
|
+ p = "PLUS";
|
|
+ break;
|
|
+ default:
|
|
+ printk("<3>Regexp: corrupted opcode\n");
|
|
+ break;
|
|
+ }
|
|
+ if (p != NULL)
|
|
+ strncat(buf, p, BUFLEN-strlen(buf));
|
|
+ return(buf);
|
|
+}
|
|
+#endif
|
|
+
|
|
+
|
|
diff -Nurp linux-2.4.26-stock/net/ipv4/netfilter/regexp/regexp.h linux-2.4.26-layer7-clean/net/ipv4/netfilter/regexp/regexp.h
|
|
--- linux-2.4.26-stock/net/ipv4/netfilter/regexp/regexp.h 1969-12-31 18:00:00.000000000 -0600
|
|
+++ linux-2.4.26-layer7-clean/net/ipv4/netfilter/regexp/regexp.h 2004-06-27 19:07:00.000000000 -0500
|
|
@@ -0,0 +1,27 @@
|
|
+/*
|
|
+ * Definitions etc. for regexp(3) routines.
|
|
+ *
|
|
+ * Caveat: this is V8 regexp(3) [actually, a reimplementation thereof],
|
|
+ * not the System V one.
|
|
+ */
|
|
+
|
|
+#ifndef REGEXP_H
|
|
+#define REGEXP_H
|
|
+
|
|
+#define NSUBEXP 10
|
|
+typedef struct regexp {
|
|
+ char *startp[NSUBEXP];
|
|
+ char *endp[NSUBEXP];
|
|
+ char regstart; /* Internal use only. */
|
|
+ char reganch; /* Internal use only. */
|
|
+ char *regmust; /* Internal use only. */
|
|
+ int regmlen; /* Internal use only. */
|
|
+ char program[1]; /* Unwarranted chumminess with compiler. */
|
|
+} regexp;
|
|
+
|
|
+regexp * regcomp(char *exp, int *patternsize);
|
|
+int regexec(regexp *prog, char *string);
|
|
+void regsub(regexp *prog, char *source, char *dest);
|
|
+void regerror(char *s);
|
|
+
|
|
+#endif
|
|
diff -Nurp linux-2.4.26-stock/net/ipv4/netfilter/regexp/regmagic.h linux-2.4.26-layer7-clean/net/ipv4/netfilter/regexp/regmagic.h
|
|
--- linux-2.4.26-stock/net/ipv4/netfilter/regexp/regmagic.h 1969-12-31 18:00:00.000000000 -0600
|
|
+++ linux-2.4.26-layer7-clean/net/ipv4/netfilter/regexp/regmagic.h 2004-06-27 19:07:00.000000000 -0500
|
|
@@ -0,0 +1,5 @@
|
|
+/*
|
|
+ * The first byte of the regexp internal "program" is actually this magic
|
|
+ * number; the start node begins in the second byte.
|
|
+ */
|
|
+#define MAGIC 0234
|
|
diff -Nurp linux-2.4.26-stock/net/ipv4/netfilter/regexp/regsub.c linux-2.4.26-layer7-clean/net/ipv4/netfilter/regexp/regsub.c
|
|
--- linux-2.4.26-stock/net/ipv4/netfilter/regexp/regsub.c 1969-12-31 18:00:00.000000000 -0600
|
|
+++ linux-2.4.26-layer7-clean/net/ipv4/netfilter/regexp/regsub.c 2004-06-27 19:07:00.000000000 -0500
|
|
@@ -0,0 +1,95 @@
|
|
+/*
|
|
+ * regsub
|
|
+ * @(#)regsub.c 1.3 of 2 April 86
|
|
+ *
|
|
+ * Copyright (c) 1986 by University of Toronto.
|
|
+ * Written by Henry Spencer. Not derived from licensed software.
|
|
+ *
|
|
+ * Permission is granted to anyone to use this software for any
|
|
+ * purpose on any computer system, and to redistribute it freely,
|
|
+ * subject to the following restrictions:
|
|
+ *
|
|
+ * 1. The author is not responsible for the consequences of use of
|
|
+ * this software, no matter how awful, even if they arise
|
|
+ * from defects in it.
|
|
+ *
|
|
+ * 2. The origin of this software must not be misrepresented, either
|
|
+ * by explicit claim or by omission.
|
|
+ *
|
|
+ * 3. Altered versions must be plainly marked as such, and must not
|
|
+ * be misrepresented as being the original software.
|
|
+ *
|
|
+ *
|
|
+ * This code was modified by Ethan Sommer to work within the kernel
|
|
+ * (it now uses kmalloc etc..)
|
|
+ *
|
|
+ */
|
|
+#include "regexp.h"
|
|
+#include "regmagic.h"
|
|
+#include <linux/string.h>
|
|
+
|
|
+
|
|
+#ifndef CHARBITS
|
|
+#define UCHARAT(p) ((int)*(unsigned char *)(p))
|
|
+#else
|
|
+#define UCHARAT(p) ((int)*(p)&CHARBITS)
|
|
+#endif
|
|
+
|
|
+#if 0
|
|
+//void regerror(char * s)
|
|
+//{
|
|
+// printk("regexp(3): %s", s);
|
|
+// /* NOTREACHED */
|
|
+//}
|
|
+#endif
|
|
+
|
|
+/*
|
|
+ - regsub - perform substitutions after a regexp match
|
|
+ */
|
|
+void
|
|
+regsub(regexp * prog, char * source, char * dest)
|
|
+{
|
|
+ register char *src;
|
|
+ register char *dst;
|
|
+ register char c;
|
|
+ register int no;
|
|
+ register int len;
|
|
+
|
|
+ /* Not necessary and gcc doesn't like it -MLS */
|
|
+ /*extern char *strncpy();*/
|
|
+
|
|
+ if (prog == NULL || source == NULL || dest == NULL) {
|
|
+ regerror("NULL parm to regsub");
|
|
+ return;
|
|
+ }
|
|
+ if (UCHARAT(prog->program) != MAGIC) {
|
|
+ regerror("damaged regexp fed to regsub");
|
|
+ return;
|
|
+ }
|
|
+
|
|
+ src = source;
|
|
+ dst = dest;
|
|
+ while ((c = *src++) != '\0') {
|
|
+ if (c == '&')
|
|
+ no = 0;
|
|
+ else if (c == '\\' && '0' <= *src && *src <= '9')
|
|
+ no = *src++ - '0';
|
|
+ else
|
|
+ no = -1;
|
|
+
|
|
+ if (no < 0) { /* Ordinary character. */
|
|
+ if (c == '\\' && (*src == '\\' || *src == '&'))
|
|
+ c = *src++;
|
|
+ *dst++ = c;
|
|
+ } else if (prog->startp[no] != NULL && prog->endp[no] != NULL) {
|
|
+ len = prog->endp[no] - prog->startp[no];
|
|
+ (void) strncpy(dst, prog->startp[no], len);
|
|
+ dst += len;
|
|
+ if (len != 0 && *(dst-1) == '\0') { /* strncpy hit NUL. */
|
|
+ regerror("damaged match string");
|
|
+ return;
|
|
+ }
|
|
+ }
|
|
+ }
|
|
+ *dst++ = '\0';
|
|
+}
|