#define BUILD_MATCH
#define MODULE_DATATYPE struct ipt_length_info
#define MODULE_NAME "length"
#define __USE_GNU
#include "../module_iface.h"
#include <string.h>
#include <stdlib.h>
#include <stdio.h>
#include <limits.h>
#include <linux/netfilter_ipv4/ipt_length.h>
static void setup(void *myinfo, unsigned int *nfcache) {
*nfcache |= NFC_UNKNOWN;
}
static int parse_field(char *field, SV *value, void *myinfo,
unsigned int *nfcache, struct ipt_entry *entry, int *flags) {
MODULE_DATATYPE *info = (void *)(*(MODULE_ENTRYTYPE **)myinfo)->data;
int val;
if(strcmp(field, "length"))
return(FALSE);
*flags = 1;
if(SvIOK(value)) {
val = SvIV(value);
if(val < 0 || val > USHRT_MAX) {
SET_ERRSTR("%s: Value out of range", field);
return(FALSE);
}
info->min = info->max = val;
}
else if(SvPOK(value)) {
char *str, *temp, *base, *extent, *sep;
STRLEN len;
temp = SvPV(value, len);
base = str = malloc(len + 1);
strncpy(str, temp, len);
str[len] = '\0';
if(*str == INVCHAR) {
info->invert = TRUE;
str++;
}
sep = strchr(str, ':');
val = strtoul(str, &extent, 10);
if(extent < (sep ? sep : str + strlen(str)) || val < 0 ||
val > USHRT_MAX) {
SET_ERRSTR("%s: Unable to parse '%s'", field, str);
free(base);
return(FALSE);
}
info->min = val;
if(sep) {
sep++;
val = strtoul(sep, &extent, 10);
if(extent < sep + strlen(sep) || val < 0 || val > USHRT_MAX) {
SET_ERRSTR("%s: Unable to parse '%s'", field, str);
free(base);
return(FALSE);
}
}
free(base);
info->max = val;
}
else {
SET_ERRSTR("%s: Must be passed as integer or string", field);
return(FALSE);
}
return(TRUE);
}
static void get_fields(HV *ent_hash, void *myinfo, struct ipt_entry *entry) {
MODULE_DATATYPE *info = (void *)((MODULE_ENTRYTYPE *)myinfo)->data;
char *string, *temp;
asprintf(&string, "%u", info->min);
if(info->min != info->max) {
asprintf(&temp, "%s:%u", string, info->max);
free(string);
string = temp;
}
if(info->invert) {
asprintf(&temp, "%c%s", INVCHAR, string);
free(string);
string = temp;
}
hv_store(ent_hash, "length", 6, newSVpv(string, 0), 0);
free(string);
}
static int final_check(void *myinfo, int flags) {
if(!flags) {
SET_ERRSTR("length match requires 'length'");
return(FALSE);
}
return(TRUE);
}
static ModuleDef _module = {
.type = MODULE_TYPE,
.name = MODULE_NAME,
.size = IPT_ALIGN(sizeof(MODULE_DATATYPE)),
.size_uspace = IPT_ALIGN(sizeof(MODULE_DATATYPE)),
.setup = setup,
.parse_field = parse_field,
.get_fields = get_fields,
.final_check = final_check,
};
ModuleDef *init(void) {
return(&_module);
}
/* vim: ts=4
*/