#define BUILD_MATCH
#define MODULE_DATATYPE struct ipt_mport
#define MODULE_NAME "mport"
#define __USE_GNU
#include "../module_iface.h"
#include <string.h>
#include <stdlib.h>
#include <stdio.h>
#include <netdb.h>
#include <netinet/in.h>
#include <linux/netfilter_ipv4/ipt_mport.h>
#include <limits.h>
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;
SV **port;
AV *portlist;
struct servent *service;
struct protoent *proto;
int i, off, mpflags;
if(!strcmp(field, "source-ports")) {
mpflags = IPT_MPORT_SOURCE;
*nfcache |= NFC_IP_SRC_PT;
}
else if(!strcmp(field, "destination-ports")) {
mpflags = IPT_MPORT_DESTINATION;
*nfcache |= NFC_IP_DST_PT;
}
else if(!strcmp(field, "ports")) {
mpflags = IPT_MPORT_EITHER;
*nfcache |= NFC_IP_SRC_PT | NFC_IP_DST_PT;
}
else
return(FALSE);
if(*flags) {
SET_ERRSTR("%s: Only one of 'ports', 'source-ports', "
"'destination-ports' may be used with mport", field);
return(FALSE);
}
*flags = 1;
info->flags = mpflags;
if(entry->ip.proto != IPPROTO_TCP && entry->ip.proto != IPPROTO_UDP) {
SET_ERRSTR("%s: Protocol must be TCP or UDP", field);
return(FALSE);
}
if(!SvROK(value) || !(portlist = (AV *)SvRV(value)) ||
SvTYPE((SV *)portlist) != SVt_PVAV) {
SET_ERRSTR("%s: Must have an array reference arg", field);
return(FALSE);
}
proto = getprotobynumber(entry->ip.proto);
for(off = 0, i = 0; off <= av_len(portlist); i++, off++) {
if (i >= IPT_MULTI_PORTS) {
SET_ERRSTR("%s: List of ports is too long", field);
return(FALSE);
}
port = av_fetch(portlist, off, 0);
if(SvIOK(*port)) {
if(SvIV(*port) < 0 || SvIV(*port) > USHRT_MAX) {
SET_ERRSTR("%s: Port value out of range", field);
return(FALSE);
}
info->ports[i] = SvIV(*port);
}
else if(SvPOK(*port)) {
char *portstr, *temp, *extent, *second;
STRLEN len;
temp = SvPV(*port, len);
portstr = malloc(len + 1);
strncpy(portstr, temp, len);
portstr[len] = '\0';
if((second = strchr(portstr, ':')))
*(second++) = '\0';
service = getservbyname(portstr, proto->p_name);
if(service)
info->ports[i] = htons(service->s_port);
else {
int val = strtoul(portstr, &extent, 10);
if(val < 0 || val > USHRT_MAX) {
SET_ERRSTR("%s: Port value out of range", field);
free(portstr);
return(FALSE);
}
info->ports[i] = val;
if(portstr + strlen(portstr) > extent) {
SET_ERRSTR("%s: Couldn't parse port '%s'", field, portstr);
free(portstr);
return(FALSE);
}
}
if(second) {
info->pflags |= 1 << i;
if(++i >= IPT_MULTI_PORTS) {
SET_ERRSTR("%s: List of ports is too long", field);
free(portstr);
return(FALSE);
}
service = getservbyname(second, proto->p_name);
if(service)
info->ports[i] = htons(service->s_port);
else {
int val = strtoul(second, &extent, 10);
if(val < 0 || val > USHRT_MAX) {
SET_ERRSTR("%s: Port value out of range", field,
second);
free(portstr);
return(FALSE);
}
info->ports[i] = val;
if(second + strlen(second) > extent) {
SET_ERRSTR("%s: Couldn't parse port '%s'", field,
second);
free(portstr);
return(FALSE);
}
}
}
free(portstr);
}
else {
SET_ERRSTR("%s: Array elements must be integer or string", field);
return(FALSE);
}
}
if(i == IPT_MULTI_PORTS-1)
info->ports[i] = info->ports[i-1];
else if(i < IPT_MULTI_PORTS-1) {
info->ports[i] = USHRT_MAX;
info->pflags |= 1<<i;
}
return(TRUE);
}
static void get_fields(HV *ent_hash, void *myinfo, struct ipt_entry *entry) {
MODULE_DATATYPE *info = (void *)((MODULE_ENTRYTYPE *)myinfo)->data;
int i;
AV *av;
SV *sv;
char *keyname = NULL;
struct servent *service;
struct protoent *proto;
av = newAV();
if(!(proto = getprotobynumber(entry->ip.proto)))
return;
for(i = 0; i < IPT_MULTI_PORTS; i++) {
if(info->pflags & (1<<i) && info->ports[i] == USHRT_MAX)
break;
if(i == IPT_MULTI_PORTS - 1 &&
info->ports[i] == info->ports[i-1])
break;
service = getservbyport(htons(info->ports[i]), proto->p_name); // LEAK
if(service)
sv = newSVpv(service->s_name, 0);
else
sv = newSViv(info->ports[i]);
if(info->pflags & (1<<i)) {
i++;
service = getservbyport(htons(info->ports[i]),
proto->p_name); // LEAK
if(SvIOK(sv))
sv = newSVpvf("%u", SvIV(sv));
sv_catpv(sv, ":");
if(service)
sv_catpv(sv, service->s_name);
else
sv_catpvf(sv, "%u", info->ports[i]);
}
av_push(av, sv);
}
if(info->flags == IPT_MPORT_SOURCE)
keyname = "source-ports";
else if(info->flags == IPT_MPORT_DESTINATION)
keyname = "destination-ports";
else if(info->flags == IPT_MPORT_EITHER)
keyname = "ports";
hv_store(ent_hash, keyname, strlen(keyname), newRV_noinc((SV *)av), 0);
}
int final_check(void *myinfo, int flags) {
if(!flags) {
SET_ERRSTR("mport must be used with one of 'ports', 'source-ports' or "
"'destination-ports'");
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)),
.parse_field = parse_field,
.get_fields = get_fields,
.final_check = final_check,
};
ModuleDef *init(void) {
return(&_module);
}
/* vim: ts=4
*/