1 #include <stdio.h> 2 #include <xtables.h> 3 #include <linux/netfilter/xt_helper.h> 4 5 enum { 6 O_HELPER = 0, 7 }; 8 9 static void helper_help(void) 10 { 11 printf( 12 "helper match options:\n" 13 "[!] --helper string Match helper identified by string\n"); 14 } 15 16 static const struct xt_option_entry helper_opts[] = { 17 {.name = "helper", .id = O_HELPER, .type = XTTYPE_STRING, 18 .flags = XTOPT_MAND | XTOPT_INVERT | XTOPT_PUT, 19 XTOPT_POINTER(struct xt_helper_info, name)}, 20 XTOPT_TABLEEND, 21 }; 22 23 static void helper_parse(struct xt_option_call *cb) 24 { 25 struct xt_helper_info *info = cb->data; 26 27 xtables_option_parse(cb); 28 if (cb->invert) 29 info->invert = 1; 30 } 31 32 static void 33 helper_print(const void *ip, const struct xt_entry_match *match, int numeric) 34 { 35 const struct xt_helper_info *info = (const void *)match->data; 36 37 printf(" helper match %s\"%s\"", info->invert ? "! " : "", info->name); 38 } 39 40 static void helper_save(const void *ip, const struct xt_entry_match *match) 41 { 42 const struct xt_helper_info *info = (const void *)match->data; 43 44 printf("%s --helper", info->invert ? " !" : ""); 45 xtables_save_string(info->name); 46 } 47 48 static int helper_xlate(struct xt_xlate *xl, 49 const struct xt_xlate_mt_params *params) 50 { 51 const struct xt_helper_info *info = (const void *)params->match->data; 52 53 if (params->escape_quotes) 54 xt_xlate_add(xl, "ct helper%s \\\"%s\\\"", 55 info->invert ? " !=" : "", info->name); 56 else 57 xt_xlate_add(xl, "ct helper%s \"%s\"", 58 info->invert ? " !=" : "", info->name); 59 60 return 1; 61 } 62 63 static struct xtables_match helper_match = { 64 .family = NFPROTO_UNSPEC, 65 .name = "helper", 66 .version = XTABLES_VERSION, 67 .size = XT_ALIGN(sizeof(struct xt_helper_info)), 68 .help = helper_help, 69 .print = helper_print, 70 .save = helper_save, 71 .x6_parse = helper_parse, 72 .x6_options = helper_opts, 73 .xlate = helper_xlate, 74 }; 75 76 void _init(void) 77 { 78 xtables_register_match(&helper_match); 79 } 80
