summaryrefslogtreecommitdiffstats
path: root/extensions/libipt_SET.c
blob: 48c722a75141ce26bec7b126bc6cea40f0348d3e (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
/* Shared library add-on to iptables to add IP set mangling target. */
#include <stdio.h>
#include <netdb.h>
#include <string.h>
#include <stdlib.h>
#include <getopt.h>
#include <ctype.h>

#include <iptables.h>
#include <linux/netfilter_ipv4/ip_tables.h>
#include <linux/netfilter_ipv4/ip_nat_rule.h>
#include <linux/netfilter_ipv4/ip_set.h>
#include <linux/netfilter_ipv4/ipt_set.h>
#include "../ipset/libipt_set.h"

/* Function which prints out usage message. */
static void help(void)
{
	printf("SET v%s options:\n"
	       " --add-set name[:flags] flags\n"
	       " --del-set name[:flags] flags\n"
	       "		add/del src/dst IP/port from/to named sets,\n"
	       "		where flags are the comma separated list of\n"
	       "		'src' and 'dst'.\n"
	       "\n", IPTABLES_VERSION);
}

static struct option opts[] = {
	{"add-set",   1, 0, '1'},
	{"del-set",   1, 0, '2'},
	{0}
};

/* Initialize the target. */
static void init(struct ipt_entry_target *target, unsigned int *nfcache)
{
	struct ipt_set_info_target *info =
	    (struct ipt_set_info_target *) target->data;

	memset(info, 0, sizeof(struct ipt_set_info_target));
	info->add_set.id = -1;
	info->del_set.id = -1;

	/* Can't cache this */
	*nfcache |= NFC_UNKNOWN;
}

/* Function which parses command options; returns true if it
   ate an option */
static int
parse(int c, char **argv, int invert, unsigned int *flags,
      const struct ipt_entry *entry, struct ipt_entry_target **target)
{
	struct ipt_set_info_target *myinfo =
	    (struct ipt_set_info_target *) (*target)->data;
	struct ipt_set_info *info;

	switch (c) {
	case '1':		/* --add-set <set>[:<flags>] <flags> */
		info = &myinfo->add_set;

		if (check_inverse(optarg, &invert, NULL, 0))
			exit_error(PARAMETER_PROBLEM,
				   "Unexpected `!' after --add-set");

		if (!argv[optind]
		    || argv[optind][0] == '-' || argv[optind][0] == '!')
			exit_error(PARAMETER_PROBLEM,
				   "--add-set requires two args.");

		parse_pool(argv[optind - 1], info);
		parse_ipflags(argv[optind++], info);
		
		*flags = 1;
		break;
	case '2':		/* --del-set <set>[:<flags>] <flags> */
		info = &myinfo->del_set;

		if (check_inverse(optarg, &invert, NULL, 0))
			exit_error(PARAMETER_PROBLEM,
				   "Unexpected `!' after --del-set");

		if (!argv[optind]
		    || argv[optind][0] == '-' || argv[optind][0] == '!')
			exit_error(PARAMETER_PROBLEM,
				   "--del-set requires two args.");

		parse_pool(argv[optind - 1], info);
		if (parse_ipflags(argv[optind++], info))
			exit_error(PARAMETER_PROBLEM,
				   "Can't use overwrite flag with --del-set.");
		
		*flags = 1;
		break;

	default:
		return 0;
	}
	return 1;
}

/* Final check; must specify at least one. */
static void final_check(unsigned int flags)
{
	if (!flags)
		exit_error(PARAMETER_PROBLEM,
			   "You must specify either `--add-set' or `--del-set'");
}

static void
print_target(const char *prefix, const struct ipt_set_info *info)
{
	int i;
	char setname[IP_SET_MAXNAMELEN];

	if (info->id >= 0) {
		get_set_byid(setname, info->id);
		printf("%s %s", prefix, setname);
		for (i = 0; i < info->set_level; i++)
			printf("%s%s",
			       i == 0 ? ":" : ",",
			       info->flags[i] & IPSET_SRC ? "src" : "dst");
		for (i = info->set_level; i < info->ip_level; i++)
			printf("%s%s%s",
			       i == info->set_level ? " " : ",",
			       info->flags[i] & IPSET_ADD_OVERWRITE ? "+" : "",
			       info->flags[i] & IPSET_SRC ? "src" : "dst");
		printf(" ");
	}
}

/* Prints out the targinfo. */
static void
print(const struct ipt_ip *ip,
      const struct ipt_entry_target *target, int numeric)
{
	struct ipt_set_info_target *info =
	    (struct ipt_set_info_target *) target->data;

	print_target("add-set", &info->add_set);
	print_target("del-set", &info->del_set);
}

/* Saves the union ipt_targinfo in parsable form to stdout. */
static void
save(const struct ipt_ip *ip, const struct ipt_entry_target *target)
{
	struct ipt_set_info_target *info =
	    (struct ipt_set_info_target *) target->data;

	print_target("--add-set", &info->add_set);
	print_target("--del-set", &info->del_set);
}

static
struct iptables_target ipt_set_target 
= {
	.name		= "SET",
	.version	= IPTABLES_VERSION,
	.size		= IPT_ALIGN(sizeof(struct ipt_set_info_target)),
	.userspacesize	= IPT_ALIGN(sizeof(struct ipt_set_info_target)),
	.help		= &help,
	.init		= &init,
	.parse		= &parse,
	.final_check	= &final_check,
	.print		= &print,
	.save		= &save,
	.extra_opts	= opts
};

void _init(void)
{
	register_target(&ipt_set_target);
}