1 /* Code to save the ip6tables state, in human readable-form. */
2 /* Author: Andras Kis-Szabo <kisza@sch.bme.hu>
3 * Original code: iptables-save
4 * Authors: Paul 'Rusty' Russel <rusty@linuxcare.com.au> and
5 * Harald Welte <laforge@gnumonks.org>
6 * This code is distributed under the terms of GNU GPL v2
7 */
8 #include <getopt.h>
9 #include <sys/errno.h>
10 #include <stdio.h>
11 #include <fcntl.h>
12 #include <stdlib.h>
13 #include <string.h>
14 #include <time.h>
15 #include <netdb.h>
16 #include <arpa/inet.h>
17 #include "libiptc/libip6tc.h"
18 #include "ip6tables.h"
19 #include "ip6tables-multi.h"
20
21 #ifndef NO_SHARED_LIBS
22 #include <dlfcn.h>
23 #endif
24
25 static int show_binary = 0, show_counters = 0;
26
27 static const struct option options[] = {
28 {.name = "binary", .has_arg = false, .val = 'b'},
29 {.name = "counters", .has_arg = false, .val = 'c'},
30 {.name = "dump", .has_arg = false, .val = 'd'},
31 {.name = "table", .has_arg = true, .val = 't'},
32 {.name = "modprobe", .has_arg = true, .val = 'M'},
33 {NULL},
34 };
35
36
37 /* Debugging prototype. */
for_each_table(int (* func)(const char * tablename))38 static int for_each_table(int (*func)(const char *tablename))
39 {
40 int ret = 1;
41 FILE *procfile = NULL;
42 char tablename[IP6T_TABLE_MAXNAMELEN+1];
43
44 procfile = fopen("/proc/net/ip6_tables_names", "re");
45 if (!procfile)
46 return ret;
47
48 while (fgets(tablename, sizeof(tablename), procfile)) {
49 if (tablename[strlen(tablename) - 1] != '\n')
50 xtables_error(OTHER_PROBLEM,
51 "Badly formed tablename `%s'\n",
52 tablename);
53 tablename[strlen(tablename) - 1] = '\0';
54 ret &= func(tablename);
55 }
56
57 fclose(procfile);
58 return ret;
59 }
60
61
do_output(const char * tablename)62 static int do_output(const char *tablename)
63 {
64 struct ip6tc_handle *h;
65 const char *chain = NULL;
66
67 if (!tablename)
68 return for_each_table(&do_output);
69
70 h = ip6tc_init(tablename);
71 if (h == NULL) {
72 xtables_load_ko(xtables_modprobe_program, false);
73 h = ip6tc_init(tablename);
74 }
75 if (!h)
76 xtables_error(OTHER_PROBLEM, "Cannot initialize: %s\n",
77 ip6tc_strerror(errno));
78
79 if (!show_binary) {
80 time_t now = time(NULL);
81
82 printf("# Generated by ip6tables-save v%s on %s",
83 IPTABLES_VERSION, ctime(&now));
84 printf("*%s\n", tablename);
85
86 /* Dump out chain names first,
87 * thereby preventing dependency conflicts */
88 for (chain = ip6tc_first_chain(h);
89 chain;
90 chain = ip6tc_next_chain(h)) {
91
92 printf(":%s ", chain);
93 if (ip6tc_builtin(chain, h)) {
94 struct ip6t_counters count;
95 printf("%s ",
96 ip6tc_get_policy(chain, &count, h));
97 printf("[%llu:%llu]\n", (unsigned long long)count.pcnt, (unsigned long long)count.bcnt);
98 } else {
99 printf("- [0:0]\n");
100 }
101 }
102
103
104 for (chain = ip6tc_first_chain(h);
105 chain;
106 chain = ip6tc_next_chain(h)) {
107 const struct ip6t_entry *e;
108
109 /* Dump out rules */
110 e = ip6tc_first_rule(chain, h);
111 while(e) {
112 print_rule6(e, h, chain, show_counters);
113 e = ip6tc_next_rule(e, h);
114 }
115 }
116
117 now = time(NULL);
118 printf("COMMIT\n");
119 printf("# Completed on %s", ctime(&now));
120 } else {
121 /* Binary, huh? OK. */
122 xtables_error(OTHER_PROBLEM, "Binary NYI\n");
123 }
124
125 ip6tc_free(h);
126
127 return 1;
128 }
129
130 /* Format:
131 * :Chain name POLICY packets bytes
132 * rule
133 */
134 #ifdef IPTABLES_MULTI
ip6tables_save_main(int argc,char * argv[])135 int ip6tables_save_main(int argc, char *argv[])
136 #else
137 int main(int argc, char *argv[])
138 #endif
139 {
140 const char *tablename = NULL;
141 int c;
142
143 ip6tables_globals.program_name = "ip6tables-save";
144 c = xtables_init_all(&ip6tables_globals, NFPROTO_IPV6);
145 if (c < 0) {
146 fprintf(stderr, "%s/%s Failed to initialize xtables\n",
147 ip6tables_globals.program_name,
148 ip6tables_globals.program_version);
149 exit(1);
150 }
151 #if defined(ALL_INCLUSIVE) || defined(NO_SHARED_LIBS)
152 init_extensions();
153 init_extensions6();
154 #endif
155
156 while ((c = getopt_long(argc, argv, "bcdt:", options, NULL)) != -1) {
157 switch (c) {
158 case 'b':
159 show_binary = 1;
160 break;
161
162 case 'c':
163 show_counters = 1;
164 break;
165
166 case 't':
167 /* Select specific table. */
168 tablename = optarg;
169 break;
170 case 'M':
171 xtables_modprobe_program = optarg;
172 break;
173 case 'd':
174 do_output(tablename);
175 exit(0);
176 }
177 }
178
179 if (optind < argc) {
180 fprintf(stderr, "Unknown arguments found on commandline\n");
181 exit(1);
182 }
183
184 return !do_output(tablename);
185 }
186