+++ /dev/null
-/* Shared library add-on to iptables to add realm matching support. */
-#include <stdio.h>
-#include <netdb.h>
-#include <string.h>
-#include <stdlib.h>
-#include <errno.h>
-#include <ctype.h>
-#include <getopt.h>
-#if defined(__GLIBC__) && __GLIBC__ == 2
-#include <net/ethernet.h>
-#else
-#include <linux/if_ether.h>
-#endif
-#include <iptables.h>
-#include <linux/netfilter_ipv4/ipt_realm.h>
-
-/* Function which prints out usage message. */
-static void realm_help(void)
-{
- printf(
-"realm match options:\n"
-" --realm [!] value[/mask]\n"
-" Match realm\n");
-}
-
-static const struct option realm_opts[] = {
- { "realm", 1, NULL, '1' },
- { .name = NULL }
-};
-
-struct realmname {
- int id;
- char* name;
- int len;
- struct realmname* next;
-};
-
-/* array of realms from /etc/iproute2/rt_realms */
-static struct realmname *realms = NULL;
-/* 1 if loading failed */
-static int rdberr = 0;
-
-
-static void load_realms(void)
-{
- const char* rfnm = "/etc/iproute2/rt_realms";
- char buf[512];
- FILE *fil;
- char *cur, *nxt;
- int id;
- struct realmname *oldnm = NULL, *newnm = NULL;
-
- fil = fopen(rfnm, "r");
- if (!fil) {
- rdberr = 1;
- return;
- }
-
- while (fgets(buf, sizeof(buf), fil)) {
- cur = buf;
- while ((*cur == ' ') || (*cur == '\t'))
- cur++;
- if ((*cur == '#') || (*cur == '\n') || (*cur == 0))
- continue;
-
- /* iproute2 allows hex and dec format */
- errno = 0;
- id = strtoul(cur, &nxt, strncmp(cur, "0x", 2) ? 10 : 16);
- if ((nxt == cur) || errno)
- continue;
-
- /* same boundaries as in iproute2 */
- if (id < 0 || id > 255)
- continue;
- cur = nxt;
-
- if (!isspace(*cur))
- continue;
- while ((*cur == ' ') || (*cur == '\t'))
- cur++;
- if ((*cur == '#') || (*cur == '\n') || (*cur == 0))
- continue;
- nxt = cur;
- while ((*nxt != 0) && !isspace(*nxt))
- nxt++;
- if (nxt == cur)
- continue;
-
- /* found valid data */
- newnm = (struct realmname*)malloc(sizeof(struct realmname));
- if (newnm == NULL) {
- perror("libipt_realm: malloc failed");
- exit(1);
- }
- newnm->id = id;
- newnm->len = nxt - cur;
- newnm->name = (char*)malloc(newnm->len + 1);
- if (newnm->name == NULL) {
- perror("libipt_realm: malloc failed");
- exit(1);
- }
- strncpy(newnm->name, cur, newnm->len);
- newnm->name[newnm->len] = 0;
- newnm->next = NULL;
-
- if (oldnm)
- oldnm->next = newnm;
- else
- realms = newnm;
- oldnm = newnm;
- }
-
- fclose(fil);
-}
-
-/* get realm id for name, -1 if error/not found */
-static int realm_name2id(const char* name)
-{
- struct realmname* cur;
-
- if ((realms == NULL) && (rdberr == 0))
- load_realms();
- cur = realms;
- if (cur == NULL)
- return -1;
- while (cur) {
- if (!strncmp(name, cur->name, cur->len + 1))
- return cur->id;
- cur = cur->next;
- }
- return -1;
-}
-
-/* get realm name for id, NULL if error/not found */
-static const char *realm_id2name(int id)
-{
- struct realmname* cur;
-
- if ((realms == NULL) && (rdberr == 0))
- load_realms();
- cur = realms;
- if (cur == NULL)
- return NULL;
- while (cur) {
- if (id == cur->id)
- return cur->name;
- cur = cur->next;
- }
- return NULL;
-}
-
-
-/* Function which parses command options; returns true if it
- ate an option */
-static int realm_parse(int c, char **argv, int invert, unsigned int *flags,
- const void *entry, struct xt_entry_match **match)
-{
- struct ipt_realm_info *realminfo = (struct ipt_realm_info *)(*match)->data;
- int id;
-
- switch (c) {
- char *end;
- case '1':
- check_inverse(argv[optind-1], &invert, &optind, 0);
- end = optarg = argv[optind-1];
- realminfo->id = strtoul(optarg, &end, 0);
- if (end != optarg && (*end == '/' || *end == '\0')) {
- if (*end == '/')
- realminfo->mask = strtoul(end+1, &end, 0);
- else
- realminfo->mask = 0xffffffff;
- if (*end != '\0' || end == optarg)
- exit_error(PARAMETER_PROBLEM,
- "Bad realm value `%s'", optarg);
- } else {
- id = realm_name2id(optarg);
- if (id == -1)
- exit_error(PARAMETER_PROBLEM,
- "Realm `%s' not found", optarg);
- realminfo->id = (u_int32_t)id;
- realminfo->mask = 0xffffffff;
- }
- if (invert)
- realminfo->invert = 1;
- *flags = 1;
- break;
-
- default:
- return 0;
- }
- return 1;
-}
-
-static void
-print_realm(unsigned long id, unsigned long mask, int numeric)
-{
- const char* name = NULL;
-
- if (mask != 0xffffffff)
- printf("0x%lx/0x%lx ", id, mask);
- else {
- if (numeric == 0)
- name = realm_id2name(id);
- if (name)
- printf("%s ", name);
- else
- printf("0x%lx ", id);
- }
-}
-
-/* Prints out the matchinfo. */
-static void realm_print(const void *ip, const struct xt_entry_match *match,
- int numeric)
-{
- struct ipt_realm_info *ri = (struct ipt_realm_info *) match->data;
-
- if (ri->invert)
- printf("! ");
-
- printf("realm ");
- print_realm(ri->id, ri->mask, numeric);
-}
-
-
-/* Saves the union ipt_matchinfo in parsable form to stdout. */
-static void realm_save(const void *ip, const struct xt_entry_match *match)
-{
- struct ipt_realm_info *ri = (struct ipt_realm_info *) match->data;
-
- if (ri->invert)
- printf("! ");
-
- printf("--realm ");
- print_realm(ri->id, ri->mask, 0);
-}
-
-/* Final check; must have specified --mark. */
-static void realm_check(unsigned int flags)
-{
- if (!flags)
- exit_error(PARAMETER_PROBLEM,
- "realm match: You must specify `--realm'");
-}
-
-static struct xtables_match realm_mt_reg = {
- .name = "realm",
- .version = XTABLES_VERSION,
- .family = PF_INET,
- .size = XT_ALIGN(sizeof(struct ipt_realm_info)),
- .userspacesize = XT_ALIGN(sizeof(struct ipt_realm_info)),
- .help = realm_help,
- .parse = realm_parse,
- .final_check = realm_check,
- .print = realm_print,
- .save = realm_save,
- .extra_opts = realm_opts,
-};
-
-void _init(void)
-{
- xtables_register_match(&realm_mt_reg);
-}
-
-
git://git.onelab.eu / iptables.git / blobdiff