first step forward to merge conntrackd and conntrack into the same building chain

1 files changed, 1131 insertions, 0 deletions

diff --git a/src/conntrack.c b/src/conntrack.c
new file mode 100644
index 0000000..30fbf69
--- /dev/null
+++ b/src/conntrack.c
@@ -0,0 +1,1131 @@
+/*
+ * (C) 2005 by Pablo Neira Ayuso <pablo@netfilter.org>
+ *
+ *      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.
+ *
+ *      This program is distributed in the hope that it will be useful,
+ *      but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *      GNU General Public License for more details.
+ *
+ *      You should have received a copy of the GNU General Public License
+ *      along with this program; if not, write to the Free Software
+ *      Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ * Note:
+ *	Yes, portions of this code has been stolen from iptables ;)
+ *	Special thanks to the the Netfilter Core Team.
+ *	Thanks to Javier de Miguel Rodriguez <jmiguel at talika.eii.us.es>
+ *	for introducing me to advanced firewalling stuff.
+ *
+ *						--pablo 13/04/2005
+ *
+ * 2005-04-16 Harald Welte <laforge@netfilter.org>: 
+ * 	Add support for conntrack accounting and conntrack mark
+ * 2005-06-23 Harald Welte <laforge@netfilter.org>:
+ * 	Add support for expect creation
+ * 2005-09-24 Harald Welte <laforge@netfilter.org>:
+ * 	Remove remaints of "-A"
+ *
+ */
+#include <stdio.h>
+#include <sys/wait.h>
+#include <stdlib.h>
+#include <getopt.h>
+#include <stdlib.h>
+#include <stdarg.h>
+#include <errno.h>
+#include <unistd.h>
+#include <netinet/in.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <sys/socket.h>
+#ifdef HAVE_ARPA_INET_H
+#include <arpa/inet.h>
+#endif
+#include <fcntl.h>
+#include <dlfcn.h>
+#include <signal.h>
+#include <string.h>
+#include "linux_list.h"
+#include "conntrack.h"
+#include <libnetfilter_conntrack/libnetfilter_conntrack.h>
+#include <libnetfilter_conntrack/libnetfilter_conntrack_ipv4.h>
+#include <libnetfilter_conntrack/libnetfilter_conntrack_ipv6.h>
+
+static const char cmdflags[NUMBER_OF_CMD]
+= {'L','I','U','D','G','F','E','V','h','L','I','D','G','F','E'};
+
+static const char cmd_need_param[NUMBER_OF_CMD]
+= { 2,  0,  0,  0,  0,  2,  2,  2,  2,  2,  0,  0,  0,  2,  2 };
+
+static const char optflags[NUMBER_OF_OPT]
+= {'s','d','r','q','p','t','u','z','e','[',']','{','}','a','m','i','f'};
+
+static struct option original_opts[] = {
+	{"dump", 2, 0, 'L'},
+	{"create", 1, 0, 'I'},
+	{"delete", 1, 0, 'D'},
+	{"update", 1, 0, 'U'},
+	{"get", 1, 0, 'G'},
+	{"flush", 1, 0, 'F'},
+	{"event", 1, 0, 'E'},
+	{"version", 0, 0, 'V'},
+	{"help", 0, 0, 'h'},
+	{"orig-src", 1, 0, 's'},
+	{"orig-dst", 1, 0, 'd'},
+	{"reply-src", 1, 0, 'r'},
+	{"reply-dst", 1, 0, 'q'},
+	{"protonum", 1, 0, 'p'},
+	{"timeout", 1, 0, 't'},
+	{"status", 1, 0, 'u'},
+	{"zero", 0, 0, 'z'},
+	{"event-mask", 1, 0, 'e'},
+	{"tuple-src", 1, 0, '['},
+	{"tuple-dst", 1, 0, ']'},
+	{"mask-src", 1, 0, '{'},
+	{"mask-dst", 1, 0, '}'},
+	{"nat-range", 1, 0, 'a'},
+	{"mark", 1, 0, 'm'},
+	{"id", 2, 0, 'i'},
+	{"family", 1, 0, 'f'},
+	{0, 0, 0, 0}
+};
+
+#define OPTION_OFFSET 256
+
+static struct nfct_handle *cth;
+static struct option *opts = original_opts;
+static unsigned int global_option_offset = 0;
+
+/* Table of legal combinations of commands and options.  If any of the
+ * given commands make an option legal, that option is legal (applies to
+ * CMD_LIST and CMD_ZERO only).
+ * Key:
+ *  0  illegal
+ *  1  compulsory
+ *  2  optional
+ */
+
+static char commands_v_options[NUMBER_OF_CMD][NUMBER_OF_OPT] =
+/* Well, it's better than "Re: Linux vs FreeBSD" */
+{
+          /*   s d r q p t u z e x y k l a m i f*/
+/*CT_LIST*/   {2,2,2,2,2,0,0,2,0,0,0,0,0,0,2,2,2},
+/*CT_CREATE*/ {2,2,2,2,1,1,1,0,0,0,0,0,0,2,2,0,0},
+/*CT_UPDATE*/ {2,2,2,2,1,2,2,0,0,0,0,0,0,0,2,2,0},
+/*CT_DELETE*/ {2,2,2,2,2,0,0,0,0,0,0,0,0,0,0,2,0},
+/*CT_GET*/    {2,2,2,2,1,0,0,0,0,0,0,0,0,0,0,2,0},
+/*CT_FLUSH*/  {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0},
+/*CT_EVENT*/  {2,2,2,2,2,0,0,0,2,0,0,0,0,0,2,0,0},
+/*VERSION*/   {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0},
+/*HELP*/      {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0},
+/*EXP_LIST*/  {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,2,2},
+/*EXP_CREATE*/{1,1,2,2,1,1,2,0,0,1,1,1,1,0,0,0,0},
+/*EXP_DELETE*/{1,1,2,2,1,0,0,0,0,0,0,0,0,0,0,0,0},
+/*EXP_GET*/   {1,1,2,2,1,0,0,0,0,0,0,0,0,0,0,0,0},
+/*EXP_FLUSH*/ {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0},
+/*EXP_EVENT*/ {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0},
+};
+
+static char *lib_dir = CONNTRACK_LIB_DIR;
+
+static LIST_HEAD(proto_list);
+
+void register_proto(struct ctproto_handler *h)
+{
+	if (strcmp(h->version, VERSION) != 0) {
+		fprintf(stderr, "plugin `%s': version %s (I'm %s)\n",
+			h->name, h->version, VERSION);
+		exit(1);
+	}
+	list_add(&h->head, &proto_list);
+}
+
+static struct ctproto_handler *findproto(char *name)
+{
+	struct list_head *i;
+	struct ctproto_handler *cur = NULL, *handler = NULL;
+
+	if (!name) 
+		return handler;
+
+	lib_dir = getenv("CONNTRACK_LIB_DIR");
+	if (!lib_dir)
+		lib_dir = CONNTRACK_LIB_DIR;
+
+	list_for_each(i, &proto_list) {
+		cur = (struct ctproto_handler *) i;
+		if (strcmp(cur->name, name) == 0) {
+			handler = cur;
+			break;
+		}
+	}
+
+	if (!handler) {
+		char path[sizeof("ct_proto_.so")
+			 + strlen(name) + strlen(lib_dir)];
+                sprintf(path, "%s/ct_proto_%s.so", lib_dir, name);
+		if (dlopen(path, RTLD_NOW))
+			handler = findproto(name);
+		else
+			fprintf(stderr, "%s\n", dlerror());
+	}
+
+	return handler;
+}
+
+enum exittype {
+        OTHER_PROBLEM = 1,
+        PARAMETER_PROBLEM,
+        VERSION_PROBLEM
+};
+
+void extension_help(struct ctproto_handler *h)
+{
+	fprintf(stdout, "\n");
+	fprintf(stdout, "Proto `%s' help:\n", h->name);
+	h->help();
+}
+
+void
+exit_tryhelp(int status)
+{
+	fprintf(stderr, "Try `%s -h' or '%s --help' for more information.\n",
+			PROGNAME, PROGNAME);
+	exit(status);
+}
+
+static void
+exit_error(enum exittype status, char *msg, ...)
+{
+	va_list args;
+
+	/* On error paths, make sure that we don't leak the memory
+	 * reserved during options merging */
+	if (opts != original_opts) {
+		free(opts);
+		opts = original_opts;
+		global_option_offset = 0;
+	}
+	va_start(args, msg);
+	fprintf(stderr,"%s v%s: ", PROGNAME, VERSION);
+	vfprintf(stderr, msg, args);
+	va_end(args);
+	fprintf(stderr, "\n");
+	if (status == PARAMETER_PROBLEM)
+		exit_tryhelp(status);
+	exit(status);
+}
+
+static void
+generic_cmd_check(int command, int options)
+{
+	int i;
+	
+	for (i = 0; i < NUMBER_OF_CMD; i++) {
+		if (!(command & (1<<i)))
+			continue;
+
+		if (cmd_need_param[i] == 0 && !options)
+			exit_error(PARAMETER_PROBLEM,
+				   "You need to supply parameters to `-%c'\n",
+				   cmdflags[i]);
+	}
+}
+
+static void
+generic_opt_check(int command, int options)
+{
+	int i, j, legal = 0;
+
+	/* Check that commands are valid with options.  Complicated by the
+	 * fact that if an option is legal with *any* command given, it is
+	 * legal overall (ie. -z and -l).
+	 */
+	for (i = 0; i < NUMBER_OF_OPT; i++) {
+		legal = 0; /* -1 => illegal, 1 => legal, 0 => undecided. */
+
+		for (j = 0; j < NUMBER_OF_CMD; j++) {
+			if (!(command & (1<<j)))
+				continue;
+
+			if (!(options & (1<<i))) {
+				if (commands_v_options[j][i] == 1) 
+					exit_error(PARAMETER_PROBLEM, 
+						   "You need to supply the "
+						   "`-%c' option for this "
+						   "command\n", optflags[i]);
+			} else {
+				if (commands_v_options[j][i] != 0)
+					legal = 1;
+				else if (legal == 0)
+					legal = -1;
+			}
+		}
+		if (legal == -1)
+			exit_error(PARAMETER_PROBLEM, "Illegal option `-%c' "
+				   "with this command\n", optflags[i]);
+	}
+}
+
+static struct option *
+merge_options(struct option *oldopts, const struct option *newopts,
+	      unsigned int *option_offset)
+{
+	unsigned int num_old, num_new, i;
+	struct option *merge;
+
+	for (num_old = 0; oldopts[num_old].name; num_old++);
+	for (num_new = 0; newopts[num_new].name; num_new++);
+
+	global_option_offset += OPTION_OFFSET;
+	*option_offset = global_option_offset;
+
+	merge = malloc(sizeof(struct option) * (num_new + num_old + 1));
+	memcpy(merge, oldopts, num_old * sizeof(struct option));
+	for (i = 0; i < num_new; i++) {
+		merge[num_old + i] = newopts[i];
+		merge[num_old + i].val += *option_offset;
+	}
+	memset(merge + num_old + num_new, 0, sizeof(struct option));
+
+	return merge;
+}
+
+/* From linux/errno.h */
+#define ENOTSUPP        524     /* Operation is not supported */
+
+/* Translates errno numbers into more human-readable form than strerror. */
+const char *
+err2str(int err, enum action command)
+{
+	unsigned int i;
+	struct table_struct {
+		enum action act;
+		int err;
+		const char *message;
+	} table [] =
+	  { { CT_LIST, -ENOTSUPP, "function not implemented" },
+	    { 0xFFFF, -EINVAL, "invalid parameters" },
+	    { CT_CREATE, -EEXIST, "Such conntrack exists, try -U to update" },
+	    { CT_CREATE|CT_GET|CT_DELETE, -ENOENT, 
+		    "such conntrack doesn't exist" },
+	    { CT_CREATE|CT_GET, -ENOMEM, "not enough memory" },
+	    { CT_GET, -EAFNOSUPPORT, "protocol not supported" },
+	    { CT_CREATE, -ETIME, "conntrack has expired" },
+	    { EXP_CREATE, -ENOENT, "master conntrack not found" },
+	    { EXP_CREATE, -EINVAL, "invalid parameters" },
+	    { ~0UL, -EPERM, "sorry, you must be root or get "
+		    	    "CAP_NET_ADMIN capability to do this"}
+	  };
+
+	for (i = 0; i < sizeof(table)/sizeof(struct table_struct); i++) {
+		if ((table[i].act & command) && table[i].err == err)
+			return table[i].message;
+	}
+
+	return strerror(err);
+}
+
+#define PARSE_STATUS 0
+#define PARSE_EVENT 1
+#define PARSE_MAX 2
+
+static struct parse_parameter {
+	char 	*parameter[6];
+	size_t  size;
+	unsigned int value[6];
+} parse_array[PARSE_MAX] = {
+	{ {"ASSURED", "SEEN_REPLY", "UNSET", "SRC_NAT", "DST_NAT","FIXED_TIMEOUT"}, 6,
+	  { IPS_ASSURED, IPS_SEEN_REPLY, 0, 
+	    IPS_SRC_NAT_DONE, IPS_DST_NAT_DONE, IPS_FIXED_TIMEOUT} },
+	{ {"ALL", "NEW", "UPDATES", "DESTROY"}, 4,
+	  {~0U, NF_NETLINK_CONNTRACK_NEW, NF_NETLINK_CONNTRACK_UPDATE, 
+	   NF_NETLINK_CONNTRACK_DESTROY} },
+};
+
+static int
+do_parse_parameter(const char *str, size_t strlen, unsigned int *value, 
+		   int parse_type)
+{
+	int i, ret = 0;
+	struct parse_parameter *p = &parse_array[parse_type];
+	
+	for (i = 0; i < p->size; i++)
+		if (strncasecmp(str, p->parameter[i], strlen) == 0) {
+			*value |= p->value[i];
+			ret = 1;
+			break;
+		}
+	
+	return ret;
+}
+
+static void
+parse_parameter(const char *arg, unsigned int *status, int parse_type)
+{
+	const char *comma;
+
+	while ((comma = strchr(arg, ',')) != NULL) {
+		if (comma == arg 
+		    || !do_parse_parameter(arg, comma-arg, status, parse_type))
+			exit_error(PARAMETER_PROBLEM,"Bad parameter `%s'", arg);
+		arg = comma+1;
+	}
+
+	if (strlen(arg) == 0
+	    || !do_parse_parameter(arg, strlen(arg), status, parse_type))
+		exit_error(PARAMETER_PROBLEM, "Bad parameter `%s'", arg);
+}
+
+static void
+add_command(unsigned int *cmd, const int newcmd, const int othercmds)
+{
+	if (*cmd & (~othercmds))
+		exit_error(PARAMETER_PROBLEM, "Invalid commands combination\n");
+	*cmd |= newcmd;
+}
+
+unsigned int check_type(int argc, char *argv[])
+{
+	char *table = NULL;
+
+	/* Nasty bug or feature in getopt_long ? 
+	 * It seems that it behaves badly with optional arguments.
+	 * Fortunately, I just stole the fix from iptables ;) */
+	if (optarg)
+		return 0;
+	else if (optind < argc && argv[optind][0] != '-' 
+			&& argv[optind][0] != '!')
+		table = argv[optind++];
+	
+	if (!table)
+		return 0;
+		
+	if (strncmp("expect", table, 6) == 0)
+		return 1;
+	else if (strncmp("conntrack", table, 9) == 0)
+		return 0;
+	else
+		exit_error(PARAMETER_PROBLEM, "unknown type `%s'\n", table);
+
+	return 0;
+}
+
+static void set_family(int *family, int new)
+{
+	if (*family == AF_UNSPEC)
+		*family = new;
+	else if (*family != new)
+		exit_error(PARAMETER_PROBLEM, "mismatched address family\n");
+}
+
+struct addr_parse {
+	struct in_addr addr;
+	struct in6_addr addr6;
+	unsigned int family;
+};
+
+int __parse_inetaddr(const char *cp, struct addr_parse *parse)
+{
+	if (inet_aton(cp, &parse->addr))
+		return AF_INET;
+#ifdef HAVE_INET_PTON_IPV6
+	else if (inet_pton(AF_INET6, cp, &parse->addr6) > 0)
+		return AF_INET6;
+#endif
+
+	exit_error(PARAMETER_PROBLEM, "Invalid IP address `%s'.", cp);
+}
+
+int parse_inetaddr(const char *cp, union nfct_address *address)
+{
+	struct addr_parse parse;
+	int ret;
+	
+	if ((ret = __parse_inetaddr(cp, &parse)) == AF_INET)
+		address->v4 = parse.addr.s_addr;
+	else if (ret == AF_INET6)
+		memcpy(address->v6, &parse.addr6, sizeof(parse.addr6));
+
+	return ret;
+}
+
+/* Shamelessly stolen from libipt_DNAT ;). Ranges expected in network order. */
+static void
+nat_parse(char *arg, int portok, struct nfct_nat *range)
+{
+	char *colon, *dash, *error;
+	struct addr_parse parse;
+
+	memset(range, 0, sizeof(range));
+	colon = strchr(arg, ':');
+
+	if (colon) {
+		int port;
+
+		if (!portok)
+			exit_error(PARAMETER_PROBLEM,
+				   "Need TCP or UDP with port specification");
+
+		port = atoi(colon+1);
+		if (port == 0 || port > 65535)
+			exit_error(PARAMETER_PROBLEM,
+				   "Port `%s' not valid\n", colon+1);
+
+		error = strchr(colon+1, ':');
+		if (error)
+			exit_error(PARAMETER_PROBLEM,
+				   "Invalid port:port syntax - use dash\n");
+
+		dash = strchr(colon, '-');
+		if (!dash) {
+			range->l4min.tcp.port
+				= range->l4max.tcp.port
+				= htons(port);
+		} else {
+			int maxport;
+
+			maxport = atoi(dash + 1);
+			if (maxport == 0 || maxport > 65535)
+				exit_error(PARAMETER_PROBLEM,
+					   "Port `%s' not valid\n", dash+1);
+			if (maxport < port)
+				/* People are stupid.  */
+				exit_error(PARAMETER_PROBLEM,
+					   "Port range `%s' funky\n", colon+1);
+			range->l4min.tcp.port = htons(port);
+			range->l4max.tcp.port = htons(maxport);
+		}
+		/* Starts with a colon? No IP info... */
+		if (colon == arg)
+			return;
+		*colon = '\0';
+	}
+
+	dash = strchr(arg, '-');
+	if (colon && dash && dash > colon)
+		dash = NULL;
+
+	if (dash)
+		*dash = '\0';
+
+	if (__parse_inetaddr(arg, &parse) != AF_INET)
+		return;
+
+	range->min_ip = parse.addr.s_addr;
+	if (dash) {
+		if (__parse_inetaddr(dash+1, &parse) != AF_INET)
+			return;
+		range->max_ip = parse.addr.s_addr;
+	} else
+		range->max_ip = parse.addr.s_addr;
+}
+
+static void event_sighandler(int s)
+{
+	fprintf(stdout, "Now closing conntrack event dumping...\n");
+	nfct_close(cth);
+	exit(0);
+}
+
+static const char usage_commands[] =
+	"Commands:\n"
+	"  -L [table] [options]\t\tList conntrack or expectation table\n"
+	"  -G [table] parameters\t\tGet conntrack or expectation\n"
+	"  -D [table] parameters\t\tDelete conntrack or expectation\n"
+	"  -I [table] parameters\t\tCreate a conntrack or expectation\n"
+	"  -U [table] parameters\t\tUpdate a conntrack\n"
+	"  -E [table] [options]\t\tShow events\n"
+	"  -F [table]\t\t\tFlush table\n";
+
+static const char usage_tables[] =
+	"Tables: conntrack, expect\n";
+
+static const char usage_conntrack_parameters[] =
+	"Conntrack parameters and options:\n"
+	"  -a, --nat-range min_ip[-max_ip]\tNAT ip range\n"
+	"  -m, --mark mark\t\t\tSet mark\n"
+	"  -e, --event-mask eventmask\t\tEvent mask, eg. NEW,DESTROY\n"
+	"  -z, --zero \t\t\t\tZero counters while listing\n"
+	;
+
+static const char usage_expectation_parameters[] =
+	"Expectation parameters and options:\n"
+	"  --tuple-src ip\tSource address in expect tuple\n"
+	"  --tuple-dst ip\tDestination address in expect tuple\n"
+	"  --mask-src ip\t\tSource mask address\n"
+	"  --mask-dst ip\t\tDestination mask address\n";
+
+static const char usage_parameters[] =
+	"Common parameters and options:\n"
+	"  -s, --orig-src ip\t\tSource address from original direction\n"
+	"  -d, --orig-dst ip\t\tDestination address from original direction\n"
+	"  -r, --reply-src ip\t\tSource addres from reply direction\n"
+	"  -q, --reply-dst ip\t\tDestination address from reply direction\n"
+	"  -p, --protonum proto\t\tLayer 4 Protocol, eg. 'tcp'\n"
+	"  -f, --family proto\t\tLayer 3 Protocol, eg. 'ipv6'\n"
+	"  -t, --timeout timeout\t\tSet timeout\n"
+	"  -u, --status status\t\tSet status, eg. ASSURED\n"
+	"  -i, --id [id]\t\t\tShow or set conntrack ID\n"
+	;
+  
+
+void usage(char *prog) {
+	fprintf(stdout, "Tool to manipulate conntrack and expectations. Version %s\n", VERSION);
+	fprintf(stdout, "Usage: %s [commands] [options]\n", prog);
+
+	fprintf(stdout, "\n%s", usage_commands);
+	fprintf(stdout, "\n%s", usage_tables);
+	fprintf(stdout, "\n%s", usage_conntrack_parameters);
+	fprintf(stdout, "\n%s", usage_expectation_parameters);
+	fprintf(stdout, "\n%s", usage_parameters);
+}
+
+#define CT_COMPARISON (CT_OPT_PROTO | CT_OPT_ORIG | CT_OPT_REPL | CT_OPT_MARK)
+
+static struct nfct_tuple orig, reply, mask;
+static struct nfct_tuple exptuple;
+static struct ctproto_handler *h;
+static union nfct_protoinfo proto;
+static struct nfct_nat range;
+static struct nfct_conntrack *ct;
+static struct nfct_expect *exp;
+static unsigned long timeout;
+static unsigned int status;
+static unsigned int mark;
+static unsigned int id = NFCT_ANY_ID;
+static struct nfct_conntrack_compare cmp;
+
+int main(int argc, char *argv[])
+{
+	int c;
+	unsigned int command = 0, options = 0;
+	unsigned int type = 0, event_mask = 0;
+	unsigned int l3flags = 0, l4flags = 0, metaflags = 0;
+	int res = 0;
+	int family = AF_UNSPEC;
+	struct nfct_conntrack_compare *pcmp;
+
+	while ((c = getopt_long(argc, argv, 
+		"L::I::U::D::G::E::F::hVs:d:r:q:p:t:u:e:a:z[:]:{:}:m:i::f:", 
+		opts, NULL)) != -1) {
+	switch(c) {
+		case 'L':
+			type = check_type(argc, argv);
+			if (type == 0)
+				add_command(&command, CT_LIST, CT_NONE);
+			else if (type == 1)
+				add_command(&command, EXP_LIST, CT_NONE);
+			break;
+		case 'I':
+			type = check_type(argc, argv);
+			if (type == 0)
+				add_command(&command, CT_CREATE, CT_NONE);
+			else if (type == 1)
+				add_command(&command, EXP_CREATE, CT_NONE);
+			break;
+		case 'U':
+			type = check_type(argc, argv);
+			if (type == 0)
+				add_command(&command, CT_UPDATE, CT_NONE);
+			else
+				exit_error(PARAMETER_PROBLEM, "Can't update "
+					   "expectations");
+			break;
+		case 'D':
+			type = check_type(argc, argv);
+			if (type == 0)
+				add_command(&command, CT_DELETE, CT_NONE);
+			else if (type == 1)
+				add_command(&command, EXP_DELETE, CT_NONE);
+			break;
+		case 'G':
+			type = check_type(argc, argv);
+			if (type == 0)
+				add_command(&command, CT_GET, CT_NONE);
+			else if (type == 1)
+				add_command(&command, EXP_GET, CT_NONE);
+			break;
+		case 'F':
+			type = check_type(argc, argv);
+			if (type == 0)
+				add_command(&command, CT_FLUSH, CT_NONE);
+			else if (type == 1)
+				add_command(&command, EXP_FLUSH, CT_NONE);
+			break;
+		case 'E':
+			type = check_type(argc, argv);
+			if (type == 0)
+				add_command(&command, CT_EVENT, CT_NONE);
+			else if (type == 1)
+				add_command(&command, EXP_EVENT, CT_NONE);
+			break;
+		case 'V':
+			add_command(&command, CT_VERSION, CT_NONE);
+			break;
+		case 'h':
+			add_command(&command, CT_HELP, CT_NONE);
+			break;
+		case 's':
+			options |= CT_OPT_ORIG_SRC;
+			if (optarg) {
+				orig.l3protonum =
+					parse_inetaddr(optarg, &orig.src);
+				set_family(&family, orig.l3protonum);
+				if (orig.l3protonum == AF_INET)
+					l3flags |= IPV4_ORIG_SRC;
+				else if (orig.l3protonum == AF_INET6)
+					l3flags |= IPV6_ORIG_SRC;
+			}
+			break;
+		case 'd':
+			options |= CT_OPT_ORIG_DST;
+			if (optarg) {
+				orig.l3protonum = 
+					parse_inetaddr(optarg, &orig.dst);
+				set_family(&family, orig.l3protonum);
+				if (orig.l3protonum == AF_INET)
+					l3flags |= IPV4_ORIG_DST;
+				else if (orig.l3protonum == AF_INET6)
+					l3flags |= IPV6_ORIG_DST;
+			}
+			break;
+		case 'r':
+			options |= CT_OPT_REPL_SRC;
+			if (optarg) {
+				reply.l3protonum = 
+					parse_inetaddr(optarg, &reply.src);
+				set_family(&family, reply.l3protonum);
+				if (orig.l3protonum == AF_INET)
+					l3flags |= IPV4_REPL_SRC;
+				else if (orig.l3protonum == AF_INET6)
+					l3flags |= IPV6_REPL_SRC;
+			}
+			break;
+		case 'q':
+			options |= CT_OPT_REPL_DST;
+			if (optarg) {
+				reply.l3protonum = 
+					parse_inetaddr(optarg, &reply.dst);
+				set_family(&family, reply.l3protonum);
+				if (orig.l3protonum == AF_INET)
+					l3flags |= IPV4_REPL_DST;
+				else if (orig.l3protonum == AF_INET6)
+					l3flags |= IPV6_REPL_DST;
+			}
+			break;
+		case 'p':
+			options |= CT_OPT_PROTO;
+			h = findproto(optarg);
+			if (!h)
+				exit_error(PARAMETER_PROBLEM, "proto needed\n");
+			orig.protonum = h->protonum;
+			reply.protonum = h->protonum;
+			exptuple.protonum = h->protonum;
+			mask.protonum = h->protonum;
+			opts = merge_options(opts, h->opts, 
+					     &h->option_offset);
+			break;
+		case 't':
+			options |= CT_OPT_TIMEOUT;
+			if (optarg)
+				timeout = atol(optarg);
+			break;
+		case 'u': {
+			if (!optarg)
+				continue;
+
+			options |= CT_OPT_STATUS;
+			parse_parameter(optarg, &status, PARSE_STATUS);
+			break;
+		}
+		case 'e':
+			options |= CT_OPT_EVENT_MASK;
+			parse_parameter(optarg, &event_mask, PARSE_EVENT);
+			break;
+		case 'z':
+			options |= CT_OPT_ZERO;
+			break;
+		case '{':
+			options |= CT_OPT_MASK_SRC;
+			if (optarg) {
+				mask.l3protonum = 
+					parse_inetaddr(optarg, &mask.src);
+				set_family(&family, mask.l3protonum);
+			}
+			break;
+		case '}':
+			options |= CT_OPT_MASK_DST;
+			if (optarg) {
+				mask.l3protonum = 
+					parse_inetaddr(optarg, &mask.dst);
+				set_family(&family, mask.l3protonum);
+			}
+			break;
+		case '[':
+			options |= CT_OPT_EXP_SRC;
+			if (optarg) {
+				exptuple.l3protonum = 
+					parse_inetaddr(optarg, &exptuple.src);
+				set_family(&family, exptuple.l3protonum);
+			}
+			break;
+		case ']':
+			options |= CT_OPT_EXP_DST;
+			if (optarg) {
+				exptuple.l3protonum = 
+					parse_inetaddr(optarg, &exptuple.dst);
+				set_family(&family, exptuple.l3protonum);
+			}
+			break;
+		case 'a':
+			options |= CT_OPT_NATRANGE;
+			set_family(&family, AF_INET);
+			nat_parse(optarg, 1, &range);
+			break;
+		case 'm':
+			options |= CT_OPT_MARK;
+			mark = atol(optarg);
+			metaflags |= NFCT_MARK;
+			break;
+		case 'i': {
+			char *s = NULL;
+			options |= CT_OPT_ID;
+			if (optarg)
+				break;
+			else if (optind < argc && argv[optind][0] != '-'
+					&& argv[optind][0] != '!')
+				s = argv[optind++];
+
+			if (s)
+				id = atol(s);
+			break;
+		}
+		case 'f':
+			options |= CT_OPT_FAMILY;
+			if (strncmp(optarg, "ipv4", strlen("ipv4")) == 0)
+				set_family(&family, AF_INET);
+			else if (strncmp(optarg, "ipv6", strlen("ipv6")) == 0)
+				set_family(&family, AF_INET6);
+			else
+				exit_error(PARAMETER_PROBLEM, "Unknown "
+					   "protocol family\n");
+			break;
+		default:
+			if (h && h->parse_opts 
+			    &&!h->parse_opts(c - h->option_offset, argv, &orig, 
+				             &reply, &exptuple, &mask, &proto, 
+					     &l4flags))
+				exit_error(PARAMETER_PROBLEM, "parse error\n");
+
+			/* Unknown argument... */
+			if (!h) {
+				usage(argv[0]);
+				exit_error(PARAMETER_PROBLEM, "Missing "
+					   "arguments...\n");
+			}
+			break;
+		}
+	}
+
+	/* default family */
+	if (family == AF_UNSPEC)
+		family = AF_INET;
+
+	generic_cmd_check(command, options);
+	generic_opt_check(command, options);
+
+	if (!(command & CT_HELP)
+	    && h && h->final_check 
+	    && !h->final_check(l4flags, command, &orig, &reply)) {
+		usage(argv[0]);
+		extension_help(h);
+		exit_error(PARAMETER_PROBLEM, "Missing protocol arguments!\n");
+	}
+
+	switch(command) {
+
+	case CT_LIST:
+		cth = nfct_open(CONNTRACK, 0);
+		if (!cth)
+			exit_error(OTHER_PROBLEM, "Can't open handler");
+
+		if (options & CT_COMPARISON) {
+
+			if (options & CT_OPT_ZERO)
+				exit_error(PARAMETER_PROBLEM, "Can't use -z "
+					   "with filtering parameters");
+
+			ct = nfct_conntrack_alloc(&orig, &reply, timeout,
+						  &proto, status, mark, id,
+						  NULL);
+			if (!ct)
+				exit_error(OTHER_PROBLEM, "Not enough memory");
+			
+			cmp.ct = ct;
+			cmp.flags = metaflags;
+			cmp.l3flags = l3flags;
+			cmp.l4flags = l4flags;
+			pcmp = &cmp;
+		}
+
+		if (options & CT_OPT_ID)
+			nfct_register_callback(cth, 
+					nfct_default_conntrack_display_id,
+					(void *) pcmp);
+		else
+			nfct_register_callback(cth,
+					nfct_default_conntrack_display,
+					(void *) pcmp);
+			
+		if (options & CT_OPT_ZERO)
+			res = 
+			nfct_dump_conntrack_table_reset_counters(cth, family);
+		else
+			res = nfct_dump_conntrack_table(cth, family);
+		nfct_close(cth);
+		break;
+
+	case EXP_LIST:
+		cth = nfct_open(EXPECT, 0);
+		if (!cth)
+			exit_error(OTHER_PROBLEM, "Can't open handler");
+		if (options & CT_OPT_ID)
+			nfct_register_callback(cth, 
+					nfct_default_expect_display_id,
+					NULL);
+		else
+			nfct_register_callback(cth,
+					nfct_default_expect_display,
+					NULL);
+		res = nfct_dump_expect_list(cth, family);
+		nfct_close(cth);
+		break;
+			
+	case CT_CREATE:
+		if ((options & CT_OPT_ORIG) 
+		    && !(options & CT_OPT_REPL)) {
+			reply.l3protonum = orig.l3protonum;
+			memcpy(&reply.src, &orig.dst, sizeof(reply.src));
+			memcpy(&reply.dst, &orig.src, sizeof(reply.dst));
+		} else if (!(options & CT_OPT_ORIG)
+			   && (options & CT_OPT_REPL)) {
+			orig.l3protonum = reply.l3protonum;
+			memcpy(&orig.src, &reply.dst, sizeof(orig.src));
+			memcpy(&orig.dst, &reply.src, sizeof(orig.dst));
+		}
+		if (options & CT_OPT_NATRANGE)
+			ct = nfct_conntrack_alloc(&orig, &reply, timeout, 
+						  &proto, status, mark, id,
+						  &range);
+		else
+			ct = nfct_conntrack_alloc(&orig, &reply, timeout, 
+						  &proto, status, mark, id,
+						  NULL);
+		if (!ct)
+			exit_error(OTHER_PROBLEM, "Not Enough memory");
+		
+		cth = nfct_open(CONNTRACK, 0);
+		if (!cth) {
+			nfct_conntrack_free(ct);
+			exit_error(OTHER_PROBLEM, "Can't open handler");
+		}
+		res = nfct_create_conntrack(cth, ct);
+		nfct_close(cth);
+		nfct_conntrack_free(ct);
+		break;
+
+	case EXP_CREATE:
+		if (options & CT_OPT_ORIG)
+			exp = nfct_expect_alloc(&orig, &exptuple,
+						&mask, timeout, id);
+		else if (options & CT_OPT_REPL)
+			exp = nfct_expect_alloc(&reply, &exptuple,
+						&mask, timeout, id);
+		if (!exp)
+			exit_error(OTHER_PROBLEM, "Not enough memory");
+
+		cth = nfct_open(EXPECT, 0);
+		if (!cth) {
+			nfct_expect_free(exp);
+			exit_error(OTHER_PROBLEM, "Can't open handler");
+		}
+		res = nfct_create_expectation(cth, exp);
+		nfct_expect_free(exp);
+		nfct_close(cth);
+		break;
+
+	case CT_UPDATE:
+		if ((options & CT_OPT_ORIG) 
+		    && !(options & CT_OPT_REPL)) {
+			reply.l3protonum = orig.l3protonum;
+			memcpy(&reply.src, &orig.dst, sizeof(reply.src));
+			memcpy(&reply.dst, &orig.src, sizeof(reply.dst));
+		} else if (!(options & CT_OPT_ORIG)
+			   && (options & CT_OPT_REPL)) {
+			orig.l3protonum = reply.l3protonum;
+			memcpy(&orig.src, &reply.dst, sizeof(orig.src));
+			memcpy(&orig.dst, &reply.src, sizeof(orig.dst));
+		}
+		ct = nfct_conntrack_alloc(&orig, &reply, timeout,
+					  &proto, status, mark, id,
+					  NULL);
+		if (!ct)
+			exit_error(OTHER_PROBLEM, "Not enough memory");
+		
+		cth = nfct_open(CONNTRACK, 0);
+		if (!cth) {
+			nfct_conntrack_free(ct);
+			exit_error(OTHER_PROBLEM, "Can't open handler");
+		}
+		res = nfct_update_conntrack(cth, ct);
+		nfct_conntrack_free(ct);
+		nfct_close(cth);
+		break;
+		
+	case CT_DELETE:
+		if (!(options & CT_OPT_ORIG) && !(options & CT_OPT_REPL))
+			exit_error(PARAMETER_PROBLEM, "Can't kill conntracks "
+						      "just by its ID");
+		cth = nfct_open(CONNTRACK, 0);
+		if (!cth)
+			exit_error(OTHER_PROBLEM, "Can't open handler");
+		if (options & CT_OPT_ORIG)
+			res = nfct_delete_conntrack(cth, &orig, 
+						    NFCT_DIR_ORIGINAL,
+						    id);
+		else if (options & CT_OPT_REPL)
+			res = nfct_delete_conntrack(cth, &reply, 
+						    NFCT_DIR_REPLY,
+						    id);
+		nfct_close(cth);
+		break;
+
+	case EXP_DELETE:
+		cth = nfct_open(EXPECT, 0);
+		if (!cth)
+			exit_error(OTHER_PROBLEM, "Can't open handler");
+		if (options & CT_OPT_ORIG)
+			res = nfct_delete_expectation(cth, &orig, id);
+		else if (options & CT_OPT_REPL)
+			res = nfct_delete_expectation(cth, &reply, id);
+		nfct_close(cth);
+		break;
+
+	case CT_GET:
+		cth = nfct_open(CONNTRACK, 0);
+		if (!cth)
+			exit_error(OTHER_PROBLEM, "Can't open handler");
+		nfct_register_callback(cth, nfct_default_conntrack_display,
+					NULL);
+		if (options & CT_OPT_ORIG)
+			res = nfct_get_conntrack(cth, &orig,
+						 NFCT_DIR_ORIGINAL, id);
+		else if (options & CT_OPT_REPL)
+			res = nfct_get_conntrack(cth, &reply,
+						 NFCT_DIR_REPLY, id);
+		nfct_close(cth);
+		break;
+
+	case EXP_GET:
+		cth = nfct_open(EXPECT, 0);
+		if (!cth)
+			exit_error(OTHER_PROBLEM, "Can't open handler");
+		nfct_register_callback(cth, nfct_default_expect_display,
+					NULL);
+		if (options & CT_OPT_ORIG)
+			res = nfct_get_expectation(cth, &orig, id);
+		else if (options & CT_OPT_REPL)
+			res = nfct_get_expectation(cth, &reply, id);
+		nfct_close(cth);
+		break;
+
+	case CT_FLUSH:
+		cth = nfct_open(CONNTRACK, 0);
+		if (!cth)
+			exit_error(OTHER_PROBLEM, "Can't open handler");
+		res = nfct_flush_conntrack_table(cth, AF_INET);
+		nfct_close(cth);
+		break;
+
+	case EXP_FLUSH:
+		cth = nfct_open(EXPECT, 0);
+		if (!cth)
+			exit_error(OTHER_PROBLEM, "Can't open handler");
+		res = nfct_flush_expectation_table(cth, AF_INET);
+		nfct_close(cth);
+		break;
+		
+	case CT_EVENT:
+		if (options & CT_OPT_EVENT_MASK)
+			cth = nfct_open(CONNTRACK, event_mask);
+		else
+			cth = nfct_open(CONNTRACK, NFCT_ALL_CT_GROUPS);
+
+		if (!cth)
+			exit_error(OTHER_PROBLEM, "Can't open handler");
+		signal(SIGINT, event_sighandler);
+
+		if (options & CT_COMPARISON) {
+			ct = nfct_conntrack_alloc(&orig, &reply, timeout,
+						  &proto, status, mark, id, 
+						  NULL);
+			if (!ct)
+				exit_error(OTHER_PROBLEM, "Not enough memory");
+
+			cmp.ct = ct;
+			cmp.flags = metaflags;
+			cmp.l3flags = l3flags;
+			cmp.l4flags = l4flags;
+			pcmp = &cmp;
+		}
+
+		nfct_register_callback(cth,
+				       nfct_default_conntrack_event_display, 
+				       (void *) pcmp);
+		res = nfct_event_conntrack(cth);
+		nfct_close(cth);
+		break;
+
+	case EXP_EVENT:
+		cth = nfct_open(EXPECT, NF_NETLINK_CONNTRACK_EXP_NEW);
+		if (!cth)
+			exit_error(OTHER_PROBLEM, "Can't open handler");
+		signal(SIGINT, event_sighandler);
+		nfct_register_callback(cth, nfct_default_expect_display,
+					NULL);
+		res = nfct_event_expectation(cth);
+		nfct_close(cth);
+		break;
+			
+	case CT_VERSION:
+		fprintf(stdout, "%s v%s\n", PROGNAME, VERSION);
+		break;
+	case CT_HELP:
+		usage(argv[0]);
+		if (options & CT_OPT_PROTO)
+			extension_help(h);
+		break;
+	default:
+		usage(argv[0]);
+		break;
+	}
+
+	if (opts != original_opts) {
+		free(opts);
+		opts = original_opts;
+		global_option_offset = 0;
+	}
+
+	if (res < 0) {
+		fprintf(stderr, "Operation failed: %s\n", err2str(res, command));
+		exit(OTHER_PROBLEM);
+	}
+
+	return 0;
+}