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authorRusty Russell <rusty@linuxcare.com.au>2000-08-27 07:47:46 +0000
committerRusty Russell <rusty@rustcorp.com.au>2000-08-27 07:47:46 +0000
commit524518261009f3f81febfdd8398becc4a80cc941 (patch)
tree9244c1e191fdf75d44725014ae890245394d975c /extensions/libipt_ah.c
parent51d9b755aba51ad769384e1d730596747f995ed1 (diff)
Patch-o-matic! now included.
Diffstat (limited to 'extensions/libipt_ah.c')
-rw-r--r--extensions/libipt_ah.c191
1 files changed, 191 insertions, 0 deletions
diff --git a/extensions/libipt_ah.c b/extensions/libipt_ah.c
new file mode 100644
index 00000000..e779fa53
--- /dev/null
+++ b/extensions/libipt_ah.c
@@ -0,0 +1,191 @@
+/* Shared library add-on to iptables to add AH support. */
+#include <stdio.h>
+#include <netdb.h>
+#include <string.h>
+#include <stdlib.h>
+#include <getopt.h>
+#include <errno.h>
+#include <iptables.h>
+#include <linux/netfilter_ipv4/ipt_ah.h>
+
+/* Function which prints out usage message. */
+static void
+help(void)
+{
+ printf(
+"AH v%s options:\n"
+" --ahspi [!] spi[:spi]\n"
+" match spi (range)\n",
+NETFILTER_VERSION);
+}
+
+static struct option opts[] = {
+ { "ahspi", 1, 0, '1' },
+ {0}
+};
+
+static u_int32_t
+parse_ah_spi(const char *spistr)
+{
+ unsigned long int spi;
+ char* ep;
+
+ spi = strtoul(spistr,&ep,0) ;
+
+ if ( spistr == ep ) {
+ exit_error(PARAMETER_PROBLEM,
+ "AH no valid digits in spi `%s'", spistr);
+ }
+ if ( spi == ULONG_MAX && errno == ERANGE ) {
+ exit_error(PARAMETER_PROBLEM,
+ "spi `%s' specified too big: would overflow", spistr);
+ }
+ if ( *spistr != '\0' && *ep != '\0' ) {
+ exit_error(PARAMETER_PROBLEM,
+ "AH error parsing spi `%s'", spistr);
+ }
+ return (u_int32_t) spi;
+}
+
+static void
+parse_ah_spis(const char *spistring, u_int32_t *spis)
+{
+ char *buffer;
+ char *cp;
+
+ buffer = strdup(spistring);
+ if ((cp = strchr(buffer, ':')) == NULL)
+ spis[0] = spis[1] = parse_ah_spi(buffer);
+ else {
+ *cp = '\0';
+ cp++;
+
+ spis[0] = buffer[0] ? parse_ah_spi(buffer) : 0;
+ spis[1] = cp[0] ? parse_ah_spi(cp) : 0xFFFFFFFF;
+ }
+ free(buffer);
+}
+
+/* Initialize the match. */
+static void
+init(struct ipt_entry_match *m, unsigned int *nfcache)
+{
+ struct ipt_ah *ahinfo = (struct ipt_ah *)m->data;
+
+ ahinfo->spis[1] = 0xFFFFFFFF;
+}
+
+#define AH_SPI 0x01
+
+/* 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,
+ unsigned int *nfcache,
+ struct ipt_entry_match **match)
+{
+ struct ipt_ah *ahinfo = (struct ipt_ah *)(*match)->data;
+
+ switch (c) {
+ case '1':
+ if (*flags & AH_SPI)
+ exit_error(PARAMETER_PROBLEM,
+ "Only one `--spi' allowed");
+ if (check_inverse(optarg, &invert))
+ optind++;
+ parse_ah_spis(argv[optind-1], ahinfo->spis);
+ if (invert)
+ ahinfo->invflags |= IPT_AH_INV_SPI;
+ *flags |= AH_SPI;
+ break;
+ default:
+ return 0;
+ }
+
+ return 1;
+}
+
+/* Final check; we don't care. */
+static void
+final_check(unsigned int flags)
+{
+}
+
+static void
+print_spis(const char *name, u_int32_t min, u_int32_t max,
+ int invert)
+{
+ const char *inv = invert ? "!" : "";
+
+ if (min != 0 || max != 0xFFFFFFFF || invert) {
+ printf("%s", name);
+ if (min == max) {
+ printf(":%s", inv);
+ printf("%u", min);
+ } else {
+ printf("s:%s", inv);
+ printf("%u",min);
+ printf(":");
+ printf("%u",max);
+ }
+ printf(" ");
+ }
+}
+
+/* Prints out the union ipt_matchinfo. */
+static void
+print(const struct ipt_ip *ip,
+ const struct ipt_entry_match *match, int numeric)
+{
+ const struct ipt_ah *ah = (struct ipt_ah *)match->data;
+
+ printf("ah ");
+ print_spis("spi", ah->spis[0], ah->spis[1],
+ ah->invflags & IPT_AH_INV_SPI);
+ if (ah->invflags & ~IPT_AH_INV_MASK)
+ printf("Unknown invflags: 0x%X ",
+ ah->invflags & ~IPT_AH_INV_MASK);
+}
+
+/* Saves the union ipt_matchinfo in parsable form to stdout. */
+static void save(const struct ipt_ip *ip, const struct ipt_entry_match *match)
+{
+ const struct ipt_ah *ahinfo = (struct ipt_ah *)match->data;
+
+ if (ahinfo->spis[0] != 0
+ && ahinfo->spis[1] != 0xFFFFFFFF) {
+ if (ahinfo->invflags & IPT_AH_INV_SPI)
+ printf("! ");
+ if (ahinfo->spis[0]
+ != ahinfo->spis[1])
+ printf("--spi %u-%u ",
+ ahinfo->spis[0],
+ ahinfo->spis[1]);
+ else
+ printf("--spi %u ",
+ ahinfo->spis[0]);
+ }
+
+}
+
+struct iptables_match ah
+= { NULL,
+ "ah",
+ NETFILTER_VERSION,
+ IPT_ALIGN(sizeof(struct ipt_ah)),
+ IPT_ALIGN(sizeof(struct ipt_ah)),
+ &help,
+ &init,
+ &parse,
+ &final_check,
+ &print,
+ &save,
+ opts
+};
+
+void
+_init(void)
+{
+ register_match(&ah);
+}