Brad Fisher | 514b1b4 | 2004-09-20 08:52:19 +0000 | [diff] [blame] | 1 | /* Shared library add-on to iptables to add comment match support. |
| 2 | * |
| 3 | * ChangeLog |
| 4 | * 2003-05-13: Brad Fisher <brad@info-link.net> |
| 5 | * Initial comment match |
| 6 | * 2004-05-12: Brad Fisher <brad@info-link.net> |
| 7 | * Port to patch-o-matic-ng |
| 8 | */ |
| 9 | #include <stdio.h> |
| 10 | #include <string.h> |
| 11 | #include <stdlib.h> |
| 12 | #include <getopt.h> |
| 13 | |
| 14 | #include <iptables.h> |
| 15 | #include <linux/netfilter_ipv4/ipt_comment.h> |
| 16 | |
| 17 | /* Function which prints out usage message. */ |
| 18 | static void |
| 19 | help(void) |
| 20 | { |
| 21 | printf( |
| 22 | "COMMENT match options:\n" |
| 23 | "--comment COMMENT Attach a comment to a rule\n\n" |
| 24 | ); |
| 25 | } |
| 26 | |
| 27 | static struct option opts[] = { |
| 28 | { "comment", 1, 0, '1' }, |
| 29 | {0} |
| 30 | }; |
| 31 | |
Brad Fisher | 514b1b4 | 2004-09-20 08:52:19 +0000 | [diff] [blame] | 32 | static void |
Harald Welte | efa8fc2 | 2005-07-19 22:03:49 +0000 | [diff] [blame] | 33 | parse_comment(const char *s, struct ipt_comment_info *info) |
Brad Fisher | 514b1b4 | 2004-09-20 08:52:19 +0000 | [diff] [blame] | 34 | { |
| 35 | int slen = strlen(s); |
| 36 | |
| 37 | if (slen >= IPT_MAX_COMMENT_LEN) { |
| 38 | exit_error(PARAMETER_PROBLEM, |
| 39 | "COMMENT must be shorter than %i characters", IPT_MAX_COMMENT_LEN); |
| 40 | } |
Harald Welte | efa8fc2 | 2005-07-19 22:03:49 +0000 | [diff] [blame] | 41 | strcpy((char *)info->comment, s); |
Brad Fisher | 514b1b4 | 2004-09-20 08:52:19 +0000 | [diff] [blame] | 42 | } |
| 43 | |
| 44 | /* Function which parses command options; returns true if it |
| 45 | ate an option */ |
| 46 | static int |
| 47 | parse(int c, char **argv, int invert, unsigned int *flags, |
| 48 | const struct ipt_entry *entry, |
| 49 | unsigned int *nfcache, |
| 50 | struct ipt_entry_match **match) |
| 51 | { |
| 52 | struct ipt_comment_info *commentinfo = (struct ipt_comment_info *)(*match)->data; |
| 53 | |
| 54 | switch (c) { |
| 55 | case '1': |
| 56 | check_inverse(argv[optind-1], &invert, &optind, 0); |
| 57 | if (invert) { |
| 58 | exit_error(PARAMETER_PROBLEM, |
| 59 | "Sorry, you can't have an inverted comment"); |
| 60 | } |
| 61 | parse_comment(argv[optind-1], commentinfo); |
| 62 | *flags = 1; |
| 63 | break; |
| 64 | |
| 65 | default: |
| 66 | return 0; |
| 67 | } |
| 68 | return 1; |
| 69 | } |
| 70 | |
| 71 | /* Final check; must have specified --comment. */ |
| 72 | static void |
| 73 | final_check(unsigned int flags) |
| 74 | { |
| 75 | if (!flags) |
| 76 | exit_error(PARAMETER_PROBLEM, |
| 77 | "COMMENT match: You must specify `--comment'"); |
| 78 | } |
| 79 | |
| 80 | /* Prints out the matchinfo. */ |
| 81 | static void |
| 82 | print(const struct ipt_ip *ip, |
| 83 | const struct ipt_entry_match *match, |
| 84 | int numeric) |
| 85 | { |
| 86 | struct ipt_comment_info *commentinfo = (struct ipt_comment_info *)match->data; |
| 87 | |
| 88 | commentinfo->comment[IPT_MAX_COMMENT_LEN-1] = '\0'; |
| 89 | printf("/* %s */ ", commentinfo->comment); |
| 90 | } |
| 91 | |
| 92 | /* Saves the union ipt_matchinfo in parsable form to stdout. */ |
| 93 | static void |
| 94 | save(const struct ipt_ip *ip, const struct ipt_entry_match *match) |
| 95 | { |
| 96 | struct ipt_comment_info *commentinfo = (struct ipt_comment_info *)match->data; |
| 97 | |
| 98 | commentinfo->comment[IPT_MAX_COMMENT_LEN-1] = '\0'; |
| 99 | printf("--comment \"%s\" ", commentinfo->comment); |
| 100 | } |
| 101 | |
| 102 | static struct iptables_match comment = { |
Pablo Neira | 8caee8b | 2004-12-28 13:11:59 +0000 | [diff] [blame] | 103 | .next = NULL, |
| 104 | .name = "comment", |
| 105 | .version = IPTABLES_VERSION, |
| 106 | .size = IPT_ALIGN(sizeof(struct ipt_comment_info)), |
| 107 | .userspacesize = IPT_ALIGN(sizeof(struct ipt_comment_info)), |
| 108 | .help = &help, |
Pablo Neira | 8caee8b | 2004-12-28 13:11:59 +0000 | [diff] [blame] | 109 | .parse = &parse, |
| 110 | .final_check = &final_check, |
| 111 | .print = &print, |
| 112 | .save = &save, |
| 113 | .extra_opts = opts |
Brad Fisher | 514b1b4 | 2004-09-20 08:52:19 +0000 | [diff] [blame] | 114 | }; |
| 115 | |
| 116 | void _init(void) |
| 117 | { |
| 118 | register_match(&comment); |
| 119 | } |