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);
}
/* 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;
}
