summaryrefslogtreecommitdiffstats
path: root/iptables-restore.c
blob: 475f345b6f3a2b0179d50ac0fb1595da5a2d749d (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
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
/* Code to restore the iptables state, from file by iptables-save. 
 * (C) 2000 by Harald Welte <laforge@gnumonks.org>
 * based on previous code from Rusty Russell <rusty@linuxcare.com.au>
 *
 * This coude is distributed under the terms of GNU GPL
 *
 * $Id$
 */

#include <getopt.h>
#include <sys/errno.h>
#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#include "iptables.h"
#include "libiptc/libiptc.h"

#ifdef DEBUG
#define DEBUGP(x, args...) fprintf(stderr, x, ## args)
#else
#define DEBUGP(x, args...) 
#endif

static int binary = 0, counters = 0, verbose = 0, noflush = 0;

/* Keeping track of external matches and targets.  */
static struct option options[] = {
	{ "binary", 0, 0, 'b' },
	{ "counters", 0, 0, 'c' },
/*	{ "verbose", 1, 0, 'v' }, */
	{ "help", 0, 0, 'h' },
	{ "noflush", 0, 0, 'n'},
	{ 0 }
};

static void print_usage(const char *name, const char *version) __attribute__((noreturn));

static void print_usage(const char *name, const char *version)
{
	fprintf(stderr, "Usage: %s [-b] [-c] [-v] [-h]\n"
			"	   [ --binary ]\n"
			"	   [ --counters ]\n"
			"	   [ --verbose ]\n"
			"	   [ --help ]\n"
			"	   [ --noflush ]\n", name);
		
	exit(1);
}

iptc_handle_t create_handle(const char *tablename)
{
	iptc_handle_t handle;

	handle = iptc_init(tablename);
	if (!handle) {
		exit_error(PARAMETER_PROBLEM, "%s: unable to initialize"
			"table '%s'\n", program_name, tablename);
		exit(1);
	}
	return handle;
}

int parse_counters(char *string, struct ipt_counters *ctr)
{
	return (sscanf(string, "[%llu:%llu]", &ctr->pcnt, &ctr->bcnt) == 2);
}

int main(int argc, char *argv[])
{
	iptc_handle_t handle;
	char buffer[10240];
	unsigned int line = 0;
	int c;
	char curtable[IPT_TABLE_MAXNAMELEN + 1];
	char curchain[IPT_FUNCTION_MAXNAMELEN + 1];
	FILE *in;

	program_name = "iptables-restore";
	program_version = NETFILTER_VERSION;

	while ((c = getopt_long(argc, argv, "bcvhn", options, NULL)) != -1) {
		switch (c) {
			case 'b':
				binary = 1;
				break;
			case 'c':
				counters = 1;
				break;
			case 'h':
				print_usage("iptables-restore",
					    NETFILTER_VERSION);
				break;
			case 'n':
				noflush = 1;
				break;
		}
	}
	
	if (optind == argc - 1) {
		in = fopen(argv[optind], "r");
		if (!in) {
			fprintf(stderr, "Can't open %s: %s", argv[optind],
				strerror(errno));
			exit(1);
		}
	}
	else if (optind < argc) {
		fprintf(stderr, "Unknown arguments found on commandline");
		exit(1);
	}
	else in = stdin;
/*
	handle = iptc_init("filter");
	if (!handle)
		exit_error(VERSION_PROBLEM,
			   "can't initialize iptables-restore: %s",
			   iptc_strerror(errno));

	if (!clean_slate(&handle))
		exit_error(OTHER_PROBLEM, "Deleting old chains: %s",
			   iptc_strerror(errno));
*/
	/* Grab standard input. */
	while (fgets(buffer, sizeof(buffer), in)) {
		int ret;

		line++;
		if (buffer[0] == '\n') continue;
		else if (buffer[0] == '#') {
			if (verbose) fputs(buffer, stdout);
			continue;
		} else if (strcmp(buffer, "COMMIT\n") == 0) {
			DEBUGP("Calling commit\n");
			ret = iptc_commit(&handle);
		} else if (buffer[0] == '*') {
			/* New table */
			char *table;

			table = strtok(buffer+1, " \t\n");
			DEBUGP("line %u, table '%s'\n", line, table);
			if (!table) {
				exit_error(PARAMETER_PROBLEM, 
					"%s: line %u table name invalid\n",
					program_name, line);
				exit(1);
			}
			strncpy(curtable, table, IPT_TABLE_MAXNAMELEN);

			handle = create_handle(table);
			if (noflush == 0) {
				DEBUGP("Cleaning all chains of table '%s'\n",
					table);
				for_each_chain(flush_entries, verbose, 1, 
						&handle);
	
				DEBUGP("Deleting all user-defined chains "
				       "of table '%s'\n", table);
				for_each_chain(delete_chain, verbose, 0, 
						&handle) ;
			}

			ret = 1;

		} else if (buffer[0] == ':') {
			/* New chain. */
			char *policy, *chain;

			chain = strtok(buffer+1, " \t\n");
			DEBUGP("line %u, chain '%s'\n", line, chain);
			if (!chain) {
				exit_error(PARAMETER_PROBLEM,
					   "%s: line %u chain name invalid\n",
					   program_name, line);
				exit(1);
			}
			strncpy(curchain, chain, IPT_FUNCTION_MAXNAMELEN);

			/* why the f... does iptc_builtin not work here ? */
			/* FIXME: abort if chain creation fails --RR */
//			if (!iptc_builtin(curchain, &handle)) {
				DEBUGP("Creating new chain '%s'\n", curchain);
				if (!iptc_create_chain(curchain, &handle))
				DEBUGP("unable to create chain '%s':%s\n", curchain,
					strerror(errno));
//			}

			policy = strtok(NULL, " \t\n");
			DEBUGP("line %u, policy '%s'\n", line, policy);
			if (!policy) {
				exit_error(PARAMETER_PROBLEM,
					   "%s: line %u policy invalid\n",
					   program_name, line);
				exit(1);
			}

			if (strcmp(policy, "-") != 0) {
				struct ipt_counters count;

				if (counters) {
					char *ctrs;
					ctrs = strtok(NULL, " \t\n");

					parse_counters(ctrs, &count);

				} else {
					memset(&count, 0, 
					       sizeof(struct ipt_counters));
				}

				DEBUGP("Setting policy of chain %s to %s\n",
					chain, policy);

				if (!iptc_set_policy(chain, policy, &count,
						     &handle))
					exit_error(OTHER_PROBLEM,
						"Can't set policy `%s'"
						" on `%s' line %u: %s\n",
						chain, policy, line,
						iptc_strerror(errno));
			}

			ret = 1;

		} else {
			char *newargv[1024];
			int i,a, argvsize;
			char *ptr = buffer;
			char *pcnt = NULL;
			char *bcnt = NULL;

			if (buffer[0] == '[') {
				ptr = strchr(buffer, ']');
				if (!ptr)
					exit_error(PARAMETER_PROBLEM,
						   "Bad line %u: need ]\n",
						   line);
				pcnt = strtok(buffer+1, ":");
				bcnt = strtok(NULL, "]");
			}

			newargv[0] = argv[0];
			newargv[1] = "-t";
			newargv[2] = (char *) &curtable;
			newargv[3] = "-A";
			newargv[4] = (char *) &curchain;
			argvsize = 5;

			if (counters && pcnt && bcnt) {
				newargv[5] = "--set-counters";
				newargv[6] = (char *) pcnt;
				newargv[7] = (char *) bcnt;
				argvsize = 8;
			}

			/* strtok: a function only a coder could love */
			for (i = argvsize; i < sizeof(newargv)/sizeof(char *); 
					i++) {
				if (!(newargv[i] = strtok(NULL, " \t\n")))
					break;
				ptr = NULL;
			}
			if (i == sizeof(newargv)/sizeof(char *)) {
				fprintf(stderr,
					"%s: line %u too many arguments\n",
					program_name, line);
				exit(1);
			}

			DEBUGP("===>calling do_command(%u, argv, &%s, handle):\n",
					i, curtable);

			for (a = 0; a <= i; a++)
				DEBUGP("argv[%u]: %s\n", a, newargv[a]);

			ret = do_command(i, newargv, &newargv[2], &handle);
		}
		if (!ret) {
			fprintf(stderr, "%s: line %u failed\n",
					program_name, line);
			exit(1);
		}
	}

	return 0;
}