diff options
Diffstat (limited to 'extensions/libip6t_ah.c')
| -rw-r--r-- | extensions/libip6t_ah.c | 227 |
1 files changed, 0 insertions, 227 deletions
diff --git a/extensions/libip6t_ah.c b/extensions/libip6t_ah.c deleted file mode 100644 index 794e02e..0000000 --- a/extensions/libip6t_ah.c +++ /dev/null @@ -1,227 +0,0 @@ -/* Shared library add-on to ip6tables to add AH support. */ -#include <stdio.h> -#include <netdb.h> -#include <string.h> -#include <stdlib.h> -#include <getopt.h> -#include <errno.h> -#include <ip6tables.h> -#include <linux/netfilter_ipv6/ip6t_ah.h> - -/* Function which prints out usage message. */ -static void -help(void) -{ - printf( -"AH v%s options:\n" -" --ahspi [!] spi[:spi] match spi (range)\n" -" --ahlen [!] length total length of this header\n" -" --ahres check the reserved filed, too\n", -IPTABLES_VERSION); -} - -static struct option opts[] = { - { .name = "ahspi", .has_arg = 1, .flag = 0, .val = '1' }, - { .name = "ahlen", .has_arg = 1, .flag = 0, .val = '2' }, - { .name = "ahres", .has_arg = 0, .flag = 0, .val = '3' }, - { .name = 0 } -}; - -static u_int32_t -parse_ah_spi(const char *spistr, const char *typestr) -{ - unsigned long int spi; - char* ep; - - spi = strtoul(spistr, &ep, 0); - - if ( spistr == ep ) - exit_error(PARAMETER_PROBLEM, - "AH no valid digits in %s `%s'", typestr, spistr); - - if ( spi == ULONG_MAX && errno == ERANGE ) - exit_error(PARAMETER_PROBLEM, - "%s `%s' specified too big: would overflow", - typestr, spistr); - - if ( *spistr != '\0' && *ep != '\0' ) - exit_error(PARAMETER_PROBLEM, - "AH error parsing %s `%s'", typestr, 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, "spi"); - else { - *cp = '\0'; - cp++; - - spis[0] = buffer[0] ? parse_ah_spi(buffer, "spi") : 0; - spis[1] = cp[0] ? parse_ah_spi(cp, "spi") : 0xFFFFFFFF; - } - free(buffer); -} - -/* Initialize the match. */ -static void -init(struct ip6t_entry_match *m, unsigned int *nfcache) -{ - struct ip6t_ah *ahinfo = (struct ip6t_ah *)m->data; - - ahinfo->spis[1] = 0xFFFFFFFF; - ahinfo->hdrlen = 0; - ahinfo->hdrres = 0; -} - -/* 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 ip6t_entry *entry, - unsigned int *nfcache, - struct ip6t_entry_match **match) -{ - struct ip6t_ah *ahinfo = (struct ip6t_ah *)(*match)->data; - - switch (c) { - case '1': - if (*flags & IP6T_AH_SPI) - exit_error(PARAMETER_PROBLEM, - "Only one `--ahspi' allowed"); - check_inverse(optarg, &invert, &optind, 0); - parse_ah_spis(argv[optind-1], ahinfo->spis); - if (invert) - ahinfo->invflags |= IP6T_AH_INV_SPI; - *flags |= IP6T_AH_SPI; - break; - case '2': - if (*flags & IP6T_AH_LEN) - exit_error(PARAMETER_PROBLEM, - "Only one `--ahlen' allowed"); - check_inverse(optarg, &invert, &optind, 0); - ahinfo->hdrlen = parse_ah_spi(argv[optind-1], "length"); - if (invert) - ahinfo->invflags |= IP6T_AH_INV_LEN; - *flags |= IP6T_AH_LEN; - break; - case '3': - if (*flags & IP6T_AH_RES) - exit_error(PARAMETER_PROBLEM, - "Only one `--ahres' allowed"); - ahinfo->hdrres = 1; - *flags |= IP6T_AH_RES; - 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) { - if (min == max) - printf("%s:%s%u ", name, inv, min); - else - printf("%ss:%s%u:%u ", name, inv, min, max); - } -} - -static void -print_len(const char *name, u_int32_t len, int invert) -{ - const char *inv = invert ? "!" : ""; - - if (len != 0 || invert) - printf("%s:%s%u ", name, inv, len); -} - -/* Prints out the union ip6t_matchinfo. */ -static void -print(const struct ip6t_ip6 *ip, - const struct ip6t_entry_match *match, int numeric) -{ - const struct ip6t_ah *ah = (struct ip6t_ah *)match->data; - - printf("ah "); - print_spis("spi", ah->spis[0], ah->spis[1], - ah->invflags & IP6T_AH_INV_SPI); - print_len("length", ah->hdrlen, - ah->invflags & IP6T_AH_INV_LEN); - - if (ah->hdrres) - printf("reserved "); - - if (ah->invflags & ~IP6T_AH_INV_MASK) - printf("Unknown invflags: 0x%X ", - ah->invflags & ~IP6T_AH_INV_MASK); -} - -/* Saves the union ip6t_matchinfo in parsable form to stdout. */ -static void save(const struct ip6t_ip6 *ip, const struct ip6t_entry_match *match) -{ - const struct ip6t_ah *ahinfo = (struct ip6t_ah *)match->data; - - if (!(ahinfo->spis[0] == 0 - && ahinfo->spis[1] == 0xFFFFFFFF)) { - printf("--ahspi %s", - (ahinfo->invflags & IP6T_AH_INV_SPI) ? "! " : ""); - if (ahinfo->spis[0] - != ahinfo->spis[1]) - printf("%u:%u ", - ahinfo->spis[0], - ahinfo->spis[1]); - else - printf("%u ", - ahinfo->spis[0]); - } - - if (ahinfo->hdrlen != 0 || (ahinfo->invflags & IP6T_AH_INV_LEN) ) { - printf("--ahlen %s%u ", - (ahinfo->invflags & IP6T_AH_INV_LEN) ? "! " : "", - ahinfo->hdrlen); - } - - if (ahinfo->hdrres != 0 ) - printf("--ahres "); -} - -static -struct ip6tables_match ah = { - .name = "ah", - .version = IPTABLES_VERSION, - .size = IP6T_ALIGN(sizeof(struct ip6t_ah)), - .userspacesize = IP6T_ALIGN(sizeof(struct ip6t_ah)), - .help = &help, - .init = &init, - .parse = &parse, - .final_check = &final_check, - .print = &print, - .save = &save, - .extra_opts = opts -}; - -void -_init(void) -{ - register_match6(&ah); -} |