| 1 | /* Shared library add-on to iptables to add ACCOUNT(ing) support. |
| 2 | Author: Intra2net AG <opensource@intra2net.com> |
| 3 | */ |
| 4 | |
| 5 | #include <stdio.h> |
| 6 | #include <netdb.h> |
| 7 | #include <string.h> |
| 8 | #include <stdlib.h> |
| 9 | #include <syslog.h> |
| 10 | #include <getopt.h> |
| 11 | #include <iptables.h> |
| 12 | #include <linux/netfilter_ipv4/ip_tables.h> |
| 13 | #include <linux/netfilter_ipv4/ipt_ACCOUNT.h> |
| 14 | |
| 15 | static struct option opts[] = { |
| 16 | { .name = "addr", .has_arg = 1, .flag = 0, .val = 'a' }, |
| 17 | { .name = "tname", .has_arg = 1, .flag = 0, .val = 't' }, |
| 18 | { .name = 0 } |
| 19 | }; |
| 20 | |
| 21 | /* Function which prints out usage message. */ |
| 22 | static void help(void) |
| 23 | { |
| 24 | printf( |
| 25 | "ACCOUNT v%s options:\n" |
| 26 | " --%s ip/netmask\t\tBase network IP and netmask used for this table\n" |
| 27 | " --%s name\t\t\tTable name for the userspace library\n", |
| 28 | IPTABLES_VERSION, opts[0].name, opts[1].name); |
| 29 | } |
| 30 | |
| 31 | /* Initialize the target. */ |
| 32 | static void |
| 33 | init(struct ipt_entry_target *t, unsigned int *nfcache) |
| 34 | { |
| 35 | struct ipt_acc_info *accountinfo = (struct ipt_acc_info *)t->data; |
| 36 | |
| 37 | accountinfo->table_nr = -1; |
| 38 | |
| 39 | /* Can't cache this */ |
| 40 | *nfcache |= NFC_UNKNOWN; |
| 41 | } |
| 42 | |
| 43 | #define IPT_ACCOUNT_OPT_ADDR 0x01 |
| 44 | #define IPT_ACCOUNT_OPT_TABLE 0x02 |
| 45 | |
| 46 | /* Function which parses command options; returns true if it |
| 47 | ate an option */ |
| 48 | static int |
| 49 | parse(int c, char **argv, int invert, unsigned int *flags, |
| 50 | const struct ipt_entry *entry, |
| 51 | struct ipt_entry_target **target) |
| 52 | { |
| 53 | struct ipt_acc_info *accountinfo = (struct ipt_acc_info *)(*target)->data; |
| 54 | struct in_addr *addrs = NULL, mask; |
| 55 | unsigned int naddrs = 0; |
| 56 | |
| 57 | switch (c) { |
| 58 | case 'a': |
| 59 | if (*flags & IPT_ACCOUNT_OPT_ADDR) |
| 60 | exit_error(PARAMETER_PROBLEM, "Can't specify --%s twice", |
| 61 | opts[0].name); |
| 62 | |
| 63 | if (check_inverse(optarg, &invert, NULL, 0)) |
| 64 | exit_error(PARAMETER_PROBLEM, "Unexpected `!' after --%s", |
| 65 | opts[0].name); |
| 66 | |
| 67 | //loginfo->level = parse_level(optarg); |
| 68 | parse_hostnetworkmask(optarg, &addrs, &mask, &naddrs); |
| 69 | |
| 70 | if (naddrs > 1) |
| 71 | exit_error(PARAMETER_PROBLEM, "multiple IP addresses not allowed"); |
| 72 | |
| 73 | accountinfo->net_ip = addrs[0].s_addr; |
| 74 | accountinfo->net_mask = mask.s_addr; |
| 75 | |
| 76 | *flags |= IPT_ACCOUNT_OPT_ADDR; |
| 77 | break; |
| 78 | |
| 79 | case 't': |
| 80 | if (*flags & IPT_ACCOUNT_OPT_TABLE) |
| 81 | exit_error(PARAMETER_PROBLEM, |
| 82 | "Can't specify --%s twice", opts[1].name); |
| 83 | |
| 84 | if (check_inverse(optarg, &invert, NULL, 0)) |
| 85 | exit_error(PARAMETER_PROBLEM, |
| 86 | "Unexpected `!' after --%s", opts[1].name); |
| 87 | |
| 88 | if (strlen(optarg) > ACCOUNT_TABLE_NAME_LEN - 1) |
| 89 | exit_error(PARAMETER_PROBLEM, |
| 90 | "Maximum table name length %u for --%s", |
| 91 | ACCOUNT_TABLE_NAME_LEN - 1, opts[1].name); |
| 92 | |
| 93 | strcpy(accountinfo->table_name, optarg); |
| 94 | *flags |= IPT_ACCOUNT_OPT_TABLE; |
| 95 | break; |
| 96 | |
| 97 | default: |
| 98 | return 0; |
| 99 | } |
| 100 | return 1; |
| 101 | } |
| 102 | |
| 103 | /* Final check; nothing. */ |
| 104 | static void final_check(unsigned int flags) |
| 105 | { |
| 106 | if (!(flags&IPT_ACCOUNT_OPT_ADDR) || !(flags&IPT_ACCOUNT_OPT_TABLE)) |
| 107 | exit_error(PARAMETER_PROBLEM, "ACCOUNT: needs --%s and --%s", |
| 108 | opts[0].name, opts[1].name); |
| 109 | } |
| 110 | |
| 111 | static void print_it(const struct ipt_ip *ip, |
| 112 | const struct ipt_entry_target *target, char do_prefix) |
| 113 | { |
| 114 | const struct ipt_acc_info *accountinfo |
| 115 | = (const struct ipt_acc_info *)target->data; |
| 116 | struct in_addr a; |
| 117 | |
| 118 | if (!do_prefix) |
| 119 | printf("ACCOUNT "); |
| 120 | |
| 121 | // Network information |
| 122 | if (do_prefix) |
| 123 | printf("--"); |
| 124 | printf("%s ", opts[0].name); |
| 125 | |
| 126 | a.s_addr = accountinfo->net_ip; |
| 127 | printf("%s", addr_to_dotted(&a)); |
| 128 | a.s_addr = accountinfo->net_mask; |
| 129 | printf("%s", mask_to_dotted(&a)); |
| 130 | |
| 131 | printf(" "); |
| 132 | if (do_prefix) |
| 133 | printf("--"); |
| 134 | |
| 135 | printf("%s %s", opts[1].name, accountinfo->table_name); |
| 136 | } |
| 137 | |
| 138 | /* Prints out the targinfo. */ |
| 139 | static void |
| 140 | print(const struct ipt_ip *ip, |
| 141 | const struct ipt_entry_target *target, |
| 142 | int numeric) |
| 143 | { |
| 144 | print_it (ip, target, 0); |
| 145 | } |
| 146 | |
| 147 | /* Saves the union ipt_targinfo in parsable form to stdout. */ |
| 148 | static void |
| 149 | save(const struct ipt_ip *ip, const struct ipt_entry_target *target) |
| 150 | { |
| 151 | print_it(ip, target, 1); |
| 152 | } |
| 153 | |
| 154 | static |
| 155 | struct iptables_target account |
| 156 | = { |
| 157 | .next = NULL, |
| 158 | .name = "ACCOUNT", |
| 159 | .version = IPTABLES_VERSION, |
| 160 | .size = IPT_ALIGN(sizeof(struct ipt_acc_info)), |
| 161 | .userspacesize = IPT_ALIGN(sizeof(struct ipt_acc_info)), |
| 162 | .help = &help, |
| 163 | .init = &init, |
| 164 | .parse = &parse, |
| 165 | .final_check = &final_check, |
| 166 | .print = &print, |
| 167 | .save = &save, |
| 168 | .extra_opts = opts |
| 169 | }; |
| 170 | |
| 171 | void _init(void) |
| 172 | { |
| 173 | register_target(&account); |
| 174 | } |