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
|
/* Shared library add-on to iptables to add comment match support.
*
* ChangeLog
* 2003-05-13: Brad Fisher <brad@info-link.net>
* Initial comment match
* 2004-05-12: Brad Fisher <brad@info-link.net>
* Port to patch-o-matic-ng
*/
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <getopt.h>
#include <xtables.h>
#include <linux/netfilter/xt_comment.h>
/* Function which prints out usage message. */
static void comment_help(void)
{
printf(
"COMMENT match options:\n"
"--comment COMMENT Attach a comment to a rule\n\n"
);
}
static const struct option comment_opts[] = {
{ "comment", 1, NULL, '1' },
{ .name = NULL }
};
static void
parse_comment(const char *s, struct xt_comment_info *info)
{
int slen = strlen(s);
if (slen >= XT_MAX_COMMENT_LEN) {
exit_error(PARAMETER_PROBLEM,
"COMMENT must be shorter than %i characters", XT_MAX_COMMENT_LEN);
}
strcpy((char *)info->comment, s);
}
/* Function which parses command options; returns true if it
ate an option */
static int
comment_parse(int c, char **argv, int invert, unsigned int *flags,
const void *entry, struct xt_entry_match **match)
{
struct xt_comment_info *commentinfo = (struct xt_comment_info *)(*match)->data;
switch (c) {
case '1':
check_inverse(argv[optind-1], &invert, &optind, 0);
if (invert) {
exit_error(PARAMETER_PROBLEM,
"Sorry, you can't have an inverted comment");
}
parse_comment(argv[optind-1], commentinfo);
*flags = 1;
break;
default:
return 0;
}
return 1;
}
/* Final check; must have specified --comment. */
static void comment_check(unsigned int flags)
{
if (!flags)
exit_error(PARAMETER_PROBLEM,
"COMMENT match: You must specify `--comment'");
}
/* Prints out the matchinfo. */
static void
comment_print(const void *ip, const struct xt_entry_match *match, int numeric)
{
struct xt_comment_info *commentinfo = (struct xt_comment_info *)match->data;
commentinfo->comment[XT_MAX_COMMENT_LEN-1] = '\0';
printf("/* %s */ ", commentinfo->comment);
}
/* Saves the union ipt_matchinfo in parsable form to stdout. */
static void
comment_save(const void *ip, const struct xt_entry_match *match)
{
struct xt_comment_info *commentinfo = (struct xt_comment_info *)match->data;
commentinfo->comment[XT_MAX_COMMENT_LEN-1] = '\0';
printf("--comment \"%s\" ", commentinfo->comment);
}
static struct xtables_match comment_match = {
.family = AF_INET,
.name = "comment",
.version = IPTABLES_VERSION,
.size = XT_ALIGN(sizeof(struct xt_comment_info)),
.userspacesize = XT_ALIGN(sizeof(struct xt_comment_info)),
.help = comment_help,
.parse = comment_parse,
.final_check = comment_check,
.print = comment_print,
.save = comment_save,
.extra_opts = comment_opts,
};
static struct xtables_match comment_match6 = {
.family = AF_INET6,
.name = "comment",
.version = IPTABLES_VERSION,
.size = XT_ALIGN(sizeof(struct xt_comment_info)),
.userspacesize = XT_ALIGN(sizeof(struct xt_comment_info)),
.help = comment_help,
.parse = comment_parse,
.final_check = comment_check,
.print = comment_print,
.save = comment_save,
.extra_opts = comment_opts,
};
void _init(void)
{
xtables_register_match(&comment_match);
xtables_register_match(&comment_match6);
}
|
