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NetBSD/dist/ipf/tools/ipnat.c
martti ad9b29ed97 Import IPFilter 4.1.1
2004-03-28 08:55:20 +00:00

399 lines
8.2 KiB
C
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/* $NetBSD: ipnat.c,v 1.1.1.1 2004/03/28 08:56:34 martti Exp $ */
/*
* Copyright (C) 1993-2001 by Darren Reed.
*
* See the IPFILTER.LICENCE file for details on licencing.
*
* Added redirect stuff and a variety of bug fixes. (mcn@EnGarde.com)
*/
#include <stdio.h>
#include <string.h>
#include <fcntl.h>
#include <errno.h>
#include <sys/types.h>
#if !defined(__SVR4) && !defined(__svr4__)
#include <strings.h>
#else
#include <sys/byteorder.h>
#endif
#include <sys/time.h>
#include <sys/param.h>
#include <stdlib.h>
#include <unistd.h>
#include <stddef.h>
#include <sys/file.h>
#define _KERNEL
#include <sys/uio.h>
#undef _KERNEL
#include <sys/socket.h>
#include <sys/ioctl.h>
#if defined(sun) && (defined(__svr4__) || defined(__SVR4))
# include <sys/ioccom.h>
# include <sys/sysmacros.h>
#endif
#include <netinet/in.h>
#include <netinet/in_systm.h>
#include <netinet/ip.h>
#include <netinet/tcp.h>
#include <net/if.h>
#if __FreeBSD_version >= 300000
# include <net/if_var.h>
#endif
#include <netdb.h>
#include <arpa/nameser.h>
#include <arpa/inet.h>
#include <resolv.h>
#include <ctype.h>
#if defined(linux)
# include <linux/a.out.h>
#else
# include <nlist.h>
#endif
#include "ipf.h"
#include "ipl.h"
#include "kmem.h"
#ifdef __hpux
# define nlist nlist64
#endif
#if defined(sun) && !SOLARIS2
# define STRERROR(x) sys_errlist[x]
extern char *sys_errlist[];
#else
# define STRERROR(x) strerror(x)
#endif
#if !defined(lint)
static const char sccsid[] ="@(#)ipnat.c 1.9 6/5/96 (C) 1993 Darren Reed";
static const char rcsid[] = "@(#)Id: ipnat.c,v 1.24 2003/11/12 09:34:33 darrenr Exp";
#endif
#if SOLARIS
#define bzero(a,b) memset(a,0,b)
#endif
int use_inet6 = 0;
char thishost[MAXHOSTNAMELEN];
extern char *optarg;
void dostats __P((natstat_t *, int)), flushtable __P((int, int));
void usage __P((char *));
int main __P((int, char*[]));
void showhostmap __P((natstat_t *nsp));
void natstat_dead __P((natstat_t *, char *));
int opts;
void usage(name)
char *name;
{
fprintf(stderr, "Usage: %s [-CFhlnrRsv] [-f filename]\n", name);
exit(1);
}
int main(argc, argv)
int argc;
char *argv[];
{
char *file, *core, *kernel;
natstat_t ns, *nsp;
int fd, c, mode;
ipfobj_t obj;
fd = -1;
opts = 0;
nsp = &ns;
file = NULL;
core = NULL;
kernel = NULL;
mode = O_RDWR;
while ((c = getopt(argc, argv, "CdFf:hlM:N:nrRsv")) != -1)
switch (c)
{
case 'C' :
opts |= OPT_CLEAR;
break;
case 'd' :
opts |= OPT_DEBUG;
break;
case 'f' :
file = optarg;
break;
case 'F' :
opts |= OPT_FLUSH;
break;
case 'h' :
opts |=OPT_HITS;
break;
case 'l' :
opts |= OPT_LIST;
mode = O_RDONLY;
break;
case 'M' :
core = optarg;
break;
case 'N' :
kernel = optarg;
break;
case 'n' :
opts |= OPT_DONOTHING;
mode = O_RDONLY;
break;
case 'R' :
opts |= OPT_NORESOLVE;
break;
case 'r' :
opts |= OPT_REMOVE;
break;
case 's' :
opts |= OPT_STAT;
mode = O_RDONLY;
break;
case 'v' :
opts |= OPT_VERBOSE;
break;
default :
usage(argv[0]);
}
initparse();
if ((kernel != NULL) || (core != NULL)) {
(void) setgid(getgid());
(void) setuid(getuid());
}
bzero((char *)&ns, sizeof(ns));
if ((opts & OPT_DONOTHING) == 0) {
if (checkrev(IPL_NAME) == -1) {
fprintf(stderr, "User/kernel version check failed\n");
exit(1);
}
}
if (!(opts & OPT_DONOTHING) && (kernel == NULL) && (core == NULL)) {
if (openkmem(kernel, core) == -1)
exit(1);
if (((fd = open(IPNAT_NAME, mode)) == -1) &&
((fd = open(IPNAT_NAME, O_RDONLY)) == -1)) {
(void) fprintf(stderr, "%s: open: %s\n", IPNAT_NAME,
STRERROR(errno));
exit(1);
}
bzero((char *)&obj, sizeof(obj));
obj.ipfo_rev = IPFILTER_VERSION;
obj.ipfo_size = sizeof(*nsp);
obj.ipfo_type = IPFOBJ_NATSTAT;
obj.ipfo_ptr = (void *)nsp;
if (ioctl(fd, SIOCGNATS, &obj) == -1) {
perror("ioctl(SIOCGNATS)");
exit(1);
}
(void) setgid(getgid());
(void) setuid(getuid());
} else if ((kernel != NULL) || (core != NULL)) {
if (openkmem(kernel, core) == -1)
exit(1);
natstat_dead(nsp, kernel);
if (opts & (OPT_LIST|OPT_STAT))
dostats(nsp, opts);
exit(0);
}
if (opts & (OPT_FLUSH|OPT_CLEAR))
flushtable(fd, opts);
if (file) {
ipnat_parsefile(fd, ipnat_addrule, ioctl, file);
}
if (opts & (OPT_LIST|OPT_STAT))
dostats(nsp, opts);
return 0;
}
/*
* Read NAT statistic information in using a symbol table and memory file
* rather than doing ioctl's.
*/
void natstat_dead(nsp, kernel)
natstat_t *nsp;
char *kernel;
{
struct nlist nat_nlist[10] = {
{ "nat_table" }, /* 0 */
{ "nat_list" },
{ "maptable" },
{ "ipf_nattable_sz" },
{ "ipf_natrules_sz" },
{ "ipf_rdrrules_sz" }, /* 5 */
{ "ipf_hostmap_sz" },
{ "nat_instances" },
{ "ap_sess_list" },
{ NULL }
};
void *tables[2];
if (nlist(kernel, nat_nlist) == -1) {
fprintf(stderr, "nlist error\n");
return;
}
/*
* Normally the ioctl copies all of these values into the structure
* for us, before returning it to userland, so here we must copy each
* one in individually.
*/
kmemcpy((char *)&tables, nat_nlist[0].n_value, sizeof(tables));
nsp->ns_table[0] = tables[0];
nsp->ns_table[1] = tables[1];
kmemcpy((char *)&nsp->ns_list, nat_nlist[1].n_value,
sizeof(nsp->ns_list));
kmemcpy((char *)&nsp->ns_maptable, nat_nlist[2].n_value,
sizeof(nsp->ns_maptable));
kmemcpy((char *)&nsp->ns_nattab_sz, nat_nlist[3].n_value,
sizeof(nsp->ns_nattab_sz));
kmemcpy((char *)&nsp->ns_rultab_sz, nat_nlist[4].n_value,
sizeof(nsp->ns_rultab_sz));
kmemcpy((char *)&nsp->ns_rdrtab_sz, nat_nlist[5].n_value,
sizeof(nsp->ns_rdrtab_sz));
kmemcpy((char *)&nsp->ns_hostmap_sz, nat_nlist[6].n_value,
sizeof(nsp->ns_hostmap_sz));
kmemcpy((char *)&nsp->ns_instances, nat_nlist[7].n_value,
sizeof(nsp->ns_instances));
kmemcpy((char *)&nsp->ns_apslist, nat_nlist[8].n_value,
sizeof(nsp->ns_apslist));
}
/*
* Display NAT statistics.
*/
void dostats(nsp, opts)
natstat_t *nsp;
int opts;
{
nat_t *np, nat;
ipnat_t ipn;
/*
* Show statistics ?
*/
if (opts & OPT_STAT) {
printf("mapped\tin\t%lu\tout\t%lu\n",
nsp->ns_mapped[0], nsp->ns_mapped[1]);
printf("added\t%lu\texpired\t%lu\n",
nsp->ns_added, nsp->ns_expire);
printf("no memory\t%lu\tbad nat\t%lu\n",
nsp->ns_memfail, nsp->ns_badnat);
printf("inuse\t%lu\nrules\t%lu\n",
nsp->ns_inuse, nsp->ns_rules);
printf("wilds\t%u\n", nsp->ns_wilds);
if (opts & OPT_VERBOSE)
printf("table %p list %p\n",
nsp->ns_table, nsp->ns_list);
}
/*
* Show list of NAT rules and NAT sessions ?
*/
if (opts & OPT_LIST) {
printf("List of active MAP/Redirect filters:\n");
while (nsp->ns_list) {
if (kmemcpy((char *)&ipn, (long)nsp->ns_list,
sizeof(ipn))) {
perror("kmemcpy");
break;
}
if (opts & OPT_HITS)
printf("%lu ", ipn.in_hits);
printnat(&ipn, opts & (OPT_DEBUG|OPT_VERBOSE));
nsp->ns_list = ipn.in_next;
}
printf("\nList of active sessions:\n");
for (np = nsp->ns_instances; np; np = nat.nat_next) {
if (kmemcpy((char *)&nat, (long)np, sizeof(nat)))
break;
printactivenat(&nat, opts);
}
if (opts & OPT_VERBOSE)
showhostmap(nsp);
}
}
/*
* Display the active host mapping table.
*/
void showhostmap(nsp)
natstat_t *nsp;
{
hostmap_t hm, *hmp, **maptable;
u_int hv;
printf("\nList of active host mappings:\n");
maptable = (hostmap_t **)malloc(sizeof(hostmap_t *) *
nsp->ns_hostmap_sz);
if (kmemcpy((char *)maptable, (u_long)nsp->ns_maptable,
sizeof(hostmap_t *) * nsp->ns_hostmap_sz)) {
perror("kmemcpy (maptable)");
return;
}
for (hv = 0; hv < nsp->ns_hostmap_sz; hv++) {
hmp = maptable[hv];
while (hmp) {
if (kmemcpy((char *)&hm, (u_long)hmp, sizeof(hm))) {
perror("kmemcpy (hostmap)");
return;
}
printhostmap(&hm, hv);
hmp = hm.hm_next;
}
}
free(maptable);
}
/*
* Issue an ioctl to flush either the NAT rules table or the active mapping
* table or both.
*/
void flushtable(fd, opts)
int fd, opts;
{
int n = 0;
if (opts & OPT_FLUSH) {
n = 0;
if (!(opts & OPT_DONOTHING) && ioctl(fd, SIOCIPFFL, &n) == -1)
perror("ioctl(SIOCFLNAT)");
else
printf("%d entries flushed from NAT table\n", n);
}
if (opts & OPT_CLEAR) {
n = 1;
if (!(opts & OPT_DONOTHING) && ioctl(fd, SIOCIPFFL, &n) == -1)
perror("ioctl(SIOCCNATL)");
else
printf("%d entries flushed from NAT list\n", n);
}
}
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