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-rw-r--r--extensions/libipt_realm.c226
1 files changed, 50 insertions, 176 deletions
diff --git a/extensions/libipt_realm.c b/extensions/libipt_realm.c
index cd4b324..a8d9dda 100644
--- a/extensions/libipt_realm.c
+++ b/extensions/libipt_realm.c
@@ -1,11 +1,7 @@
-/* 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
@@ -14,6 +10,10 @@
#include <xtables.h>
#include <linux/netfilter_ipv4/ipt_realm.h>
+enum {
+ O_REALM = 0,
+};
+
static void realm_help(void)
{
printf(
@@ -22,168 +22,49 @@ static void realm_help(void)
" 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;
+static const struct xt_option_entry realm_opts[] = {
+ {.name = "realm", .id = O_REALM, .type = XTTYPE_STRING,
+ .flags = XTOPT_MAND | XTOPT_INVERT},
+ XTOPT_TABLEEND,
};
/* array of realms from /etc/iproute2/rt_realms */
-static struct realmname *realms;
-/* 1 if loading failed */
-static int rdberr;
+static struct xtables_lmap *realms;
-static void load_realms(void)
+static void realm_init(struct xt_entry_match *m)
{
- 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 = malloc(sizeof(struct realmname));
- if (newnm == NULL) {
- perror("libipt_realm: malloc failed");
- exit(1);
- }
- newnm->id = id;
- newnm->len = nxt - cur;
- newnm->name = 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);
+ const char file[] = "/etc/iproute2/rt_realms";
+ realms = xtables_lmap_init(file);
+ if (realms == NULL && errno != ENOENT)
+ fprintf(stderr, "Warning: %s: %s\n", file, strerror(errno));
}
-/* get realm id for name, -1 if error/not found */
-static int realm_name2id(const char* name)
+static void realm_parse(struct xt_option_call *cb)
{
- 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;
-}
-
-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;
+ struct xt_realm_info *realminfo = cb->data;
int id;
+ char *end;
- switch (c) {
- char *end;
- case '1':
- xtables_check_inverse(optarg, &invert, &optind, 0, argv);
- end = optarg = optarg;
- 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)
- xtables_error(PARAMETER_PROBLEM,
- "Bad realm value `%s'", optarg);
- } else {
- id = realm_name2id(optarg);
- if (id == -1)
- xtables_error(PARAMETER_PROBLEM,
- "Realm `%s' not found", optarg);
- realminfo->id = id;
+ xtables_option_parse(cb);
+ realminfo->id = strtoul(cb->arg, &end, 0);
+ if (end != cb->arg && (*end == '/' || *end == '\0')) {
+ if (*end == '/')
+ realminfo->mask = strtoul(end+1, &end, 0);
+ else
realminfo->mask = 0xffffffff;
- }
- if (invert)
- realminfo->invert = 1;
- *flags = 1;
- break;
-
- default:
- return 0;
+ if (*end != '\0' || end == cb->arg)
+ xtables_error(PARAMETER_PROBLEM,
+ "Bad realm value \"%s\"", cb->arg);
+ } else {
+ id = xtables_lmap_name2id(realms, cb->arg);
+ if (id == -1)
+ xtables_error(PARAMETER_PROBLEM,
+ "Realm \"%s\" not found", cb->arg);
+ realminfo->id = id;
+ realminfo->mask = 0xffffffff;
}
- return 1;
+ if (cb->invert)
+ realminfo->invert = 1;
}
static void
@@ -192,59 +73,52 @@ print_realm(unsigned long id, unsigned long mask, int numeric)
const char* name = NULL;
if (mask != 0xffffffff)
- printf("0x%lx/0x%lx ", id, mask);
+ printf(" 0x%lx/0x%lx", id, mask);
else {
if (numeric == 0)
- name = realm_id2name(id);
+ name = xtables_lmap_id2name(realms, id);
if (name)
- printf("%s ", name);
+ printf(" %s", name);
else
- printf("0x%lx ", id);
+ printf(" 0x%lx", id);
}
}
static void realm_print(const void *ip, const struct xt_entry_match *match,
int numeric)
{
- const struct ipt_realm_info *ri = (const void *)match->data;
+ const struct xt_realm_info *ri = (const void *)match->data;
if (ri->invert)
- printf("! ");
+ printf(" !");
- printf("realm ");
+ printf(" realm");
print_realm(ri->id, ri->mask, numeric);
}
static void realm_save(const void *ip, const struct xt_entry_match *match)
{
- const struct ipt_realm_info *ri = (const void *)match->data;
+ const struct xt_realm_info *ri = (const void *)match->data;
if (ri->invert)
- printf("! ");
+ printf(" !");
- printf("--realm ");
+ printf(" --realm");
print_realm(ri->id, ri->mask, 0);
}
-static void realm_check(unsigned int flags)
-{
- if (!flags)
- xtables_error(PARAMETER_PROBLEM,
- "realm match: You must specify `--realm'");
-}
-
static struct xtables_match realm_mt_reg = {
.name = "realm",
.version = XTABLES_VERSION,
.family = NFPROTO_IPV4,
- .size = XT_ALIGN(sizeof(struct ipt_realm_info)),
- .userspacesize = XT_ALIGN(sizeof(struct ipt_realm_info)),
+ .size = XT_ALIGN(sizeof(struct xt_realm_info)),
+ .userspacesize = XT_ALIGN(sizeof(struct xt_realm_info)),
.help = realm_help,
- .parse = realm_parse,
- .final_check = realm_check,
+ .init = realm_init,
.print = realm_print,
.save = realm_save,
- .extra_opts = realm_opts,
+ .x6_parse = realm_parse,
+ .x6_options = realm_opts,
};
void _init(void)
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-25 17:34:51 +0000