ipt_ACCOUNT: (tomj) fix for kernel >= 2.6.19, compat glue for older kernels, simplifi...

[ipt_ACCOUNT] / iptables / extensions / libipt_ACCOUNT.c

diff --git a/iptables/extensions/libipt_ACCOUNT.c b/iptables/extensions/libipt_ACCOUNT.c
new file mode 100644 (file)
index 0000000..084c31f
--- /dev/null
+++ b/iptables/extensions/libipt_ACCOUNT.c
@@ -0,0 +1,174 @@
+/* Shared library add-on to iptables to add ACCOUNT(ing) support.
+   Author: Intra2net AG <opensource@intra2net.com>
+*/
+
+#include <stdio.h>
+#include <netdb.h>
+#include <string.h>
+#include <stdlib.h>
+#include <syslog.h>
+#include <getopt.h>
+#include <iptables.h>
+#include <linux/netfilter_ipv4/ip_tables.h>
+#include <linux/netfilter_ipv4/ipt_ACCOUNT.h>
+
+static struct option opts[] = {
+    { .name = "addr",        .has_arg = 1, .flag = 0, .val = 'a' },
+    { .name = "tname",       .has_arg = 1, .flag = 0, .val = 't' },
+    { .name = 0 }
+};
+
+/* Function which prints out usage message. */
+static void help(void)
+{
+    printf(
+"ACCOUNT v%s options:\n"
+" --%s ip/netmask\t\tBase network IP and netmask used for this table\n"
+" --%s name\t\t\tTable name for the userspace library\n",
+IPTABLES_VERSION, opts[0].name, opts[1].name);
+}
+
+/* Initialize the target. */
+static void
+init(struct ipt_entry_target *t, unsigned int *nfcache)
+{
+    struct ipt_acc_info *accountinfo = (struct ipt_acc_info *)t->data;
+
+    accountinfo->table_nr = -1;
+
+    /* Can't cache this */
+    *nfcache |= NFC_UNKNOWN;
+}
+
+#define IPT_ACCOUNT_OPT_ADDR 0x01
+#define IPT_ACCOUNT_OPT_TABLE 0x02
+
+/* Function which parses command options; returns true if it
+   ate an option */
+static int
+parse(int c, char **argv, int invert, unsigned int *flags,
+      const struct ipt_entry *entry,
+      struct ipt_entry_target **target)
+{
+    struct ipt_acc_info *accountinfo = (struct ipt_acc_info *)(*target)->data;
+    struct in_addr *addrs = NULL, mask;
+    unsigned int naddrs = 0;
+
+    switch (c) {
+    case 'a':
+        if (*flags & IPT_ACCOUNT_OPT_ADDR)
+                exit_error(PARAMETER_PROBLEM, "Can't specify --%s twice",
+                            opts[0].name);
+
+        if (check_inverse(optarg, &invert, NULL, 0))
+                exit_error(PARAMETER_PROBLEM, "Unexpected `!' after --%s",
+                            opts[0].name);
+
+        //loginfo->level = parse_level(optarg);
+        parse_hostnetworkmask(optarg, &addrs, &mask, &naddrs);
+        
+        if (naddrs > 1)
+                exit_error(PARAMETER_PROBLEM, "multiple IP addresses not allowed");
+        
+        accountinfo->net_ip = addrs[0].s_addr;
+        accountinfo->net_mask = mask.s_addr;
+                
+        *flags |= IPT_ACCOUNT_OPT_ADDR;
+        break;
+
+    case 't':
+            if (*flags & IPT_ACCOUNT_OPT_TABLE)
+                    exit_error(PARAMETER_PROBLEM,
+                                "Can't specify --%s twice", opts[1].name);
+
+            if (check_inverse(optarg, &invert, NULL, 0))
+                    exit_error(PARAMETER_PROBLEM,
+                                "Unexpected `!' after --%s", opts[1].name);
+
+            if (strlen(optarg) > ACCOUNT_TABLE_NAME_LEN - 1)
+                    exit_error(PARAMETER_PROBLEM,
+                                "Maximum table name length %u for --%s",
+                                ACCOUNT_TABLE_NAME_LEN - 1, opts[1].name);
+
+            strcpy(accountinfo->table_name, optarg);
+            *flags |= IPT_ACCOUNT_OPT_TABLE;
+            break;
+    
+    default:
+            return 0;
+    }
+    return 1;
+}
+
+/* Final check; nothing. */
+static void final_check(unsigned int flags)
+{
+    if (!(flags&IPT_ACCOUNT_OPT_ADDR) || !(flags&IPT_ACCOUNT_OPT_TABLE))
+        exit_error(PARAMETER_PROBLEM, "ACCOUNT: needs --%s and --%s",
+                    opts[0].name, opts[1].name);
+}
+
+static void print_it(const struct ipt_ip *ip,
+                     const struct ipt_entry_target *target, char do_prefix)
+{
+    const struct ipt_acc_info *accountinfo
+        = (const struct ipt_acc_info *)target->data;
+    struct in_addr a;
+
+    if (!do_prefix)
+        printf("ACCOUNT ");
+    
+    // Network information
+    if (do_prefix)
+       printf("--");
+    printf("%s ", opts[0].name);
+    
+    a.s_addr = accountinfo->net_ip;    
+    printf("%s", addr_to_dotted(&a));
+    a.s_addr = accountinfo->net_mask;
+    printf("%s", mask_to_dotted(&a));
+
+    printf(" ");
+    if (do_prefix)
+       printf("--");
+
+    printf("%s %s", opts[1].name, accountinfo->table_name);
+}
+
+/* Prints out the targinfo. */
+static void
+print(const struct ipt_ip *ip,
+      const struct ipt_entry_target *target,
+      int numeric)
+{
+    print_it (ip, target, 0);
+}
+
+/* Saves the union ipt_targinfo in parsable form to stdout. */
+static void
+save(const struct ipt_ip *ip, const struct ipt_entry_target *target)
+{
+    print_it(ip, target, 1);
+}
+
+static
+struct iptables_target account
+= {
+    .next          = NULL,
+    .name          = "ACCOUNT",
+    .version       = IPTABLES_VERSION,
+    .size          = IPT_ALIGN(sizeof(struct ipt_acc_info)),
+    .userspacesize = IPT_ALIGN(sizeof(struct ipt_acc_info)),
+    .help          = &help,
+    .init          = &init,
+    .parse         = &parse,
+    .final_check   = &final_check,
+    .print         = &print,
+    .save          = &save,
+    .extra_opts    = opts
+};
+
+void _init(void)
+{
+    register_target(&account);
+}