freebsd-dev/contrib/ipfilter/ipnat.c
Guido van Rooij 23a0caaf86 Import of ipfilter 3.3.6 (freebsd relevant part)
Obtained from:	ftp://coombs.anu.edu.au/pub/net/firewall/ip-filter/ip_fil3.3.6.tar.gz
2000-01-13 18:30:37 +00:00

451 lines
9.7 KiB
C

/*
* Copyright (C) 1993-1998 by Darren Reed.
*
* Redistribution and use in source and binary forms are permitted
* provided that this notice is preserved and due credit is given
* to the original author and the contributors.
*
* 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/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>
#include "netinet/ip_compat.h"
#include "netinet/ip_fil.h"
#include "netinet/ip_proxy.h"
#include "netinet/ip_nat.h"
#include "kmem.h"
#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 2.1.2.2 1999/12/04 02:09:30 darrenr Exp $";
#endif
#if SOLARIS
#define bzero(a,b) memset(a,0,b)
#endif
extern char *optarg;
extern ipnat_t *natparse __P((char *, int));
extern void natparsefile __P((int, char *, int));
extern void printnat __P((ipnat_t *, int, void *));
u_32_t hostnum __P((char *, int *, int));
u_32_t hostmask __P((char *));
void dostats __P((int, int)), flushtable __P((int, int));
void usage __P((char *));
int countbits __P((u_32_t));
char *getnattype __P((ipnat_t *));
int main __P((int, char*[]));
void printaps __P((ap_session_t *, int));
char *getsumd __P((u_32_t));
#define OPT_REM 1
#define OPT_NODO 2
#define OPT_STAT 4
#define OPT_LIST 8
#define OPT_VERBOSE 16
#define OPT_FLUSH 32
#define OPT_CLEAR 64
#define OPT_HITS 128
void usage(name)
char *name;
{
fprintf(stderr, "%s: [-CFhlnrsv] [-f filename]\n", name);
exit(1);
}
char *getsumd(sum)
u_32_t sum;
{
static char sumdbuf[17];
if (sum & NAT_HW_CKSUM)
sprintf(sumdbuf, "hw(%#0x)", sum & 0xffff);
else
sprintf(sumdbuf, "%#0x", sum);
return sumdbuf;
}
int main(argc, argv)
int argc;
char *argv[];
{
char *file = NULL;
int fd = -1, opts = 0, c;
while ((c = getopt(argc, argv, "CFf:hlnrsv")) != -1)
switch (c)
{
case 'C' :
opts |= OPT_CLEAR;
break;
case 'f' :
file = optarg;
break;
case 'F' :
opts |= OPT_FLUSH;
break;
case 'h' :
opts |=OPT_HITS;
break;
case 'l' :
opts |= OPT_LIST;
break;
case 'n' :
opts |= OPT_NODO;
break;
case 'r' :
opts |= OPT_REM;
break;
case 's' :
opts |= OPT_STAT;
break;
case 'v' :
opts |= OPT_VERBOSE;
break;
default :
usage(argv[0]);
}
if (!(opts & OPT_NODO) && ((fd = open(IPL_NAT, O_RDWR)) == -1) &&
((fd = open(IPL_NAT, O_RDONLY)) == -1)) {
(void) fprintf(stderr, "%s: open: %s\n", IPL_NAT,
STRERROR(errno));
exit(-1);
}
if (opts & (OPT_FLUSH|OPT_CLEAR))
flushtable(fd, opts);
if (file)
natparsefile(fd, file, opts);
if (opts & (OPT_LIST|OPT_STAT))
dostats(fd, opts);
return 0;
}
/*
* count consecutive 1's in bit mask. If the mask generated by counting
* consecutive 1's is different to that passed, return -1, else return #
* of bits.
*/
int countbits(ip)
u_32_t ip;
{
u_32_t ipn;
int cnt = 0, i, j;
ip = ipn = ntohl(ip);
for (i = 32; i; i--, ipn *= 2)
if (ipn & 0x80000000)
cnt++;
else
break;
ipn = 0;
for (i = 32, j = cnt; i; i--, j--) {
ipn *= 2;
if (j > 0)
ipn++;
}
if (ipn == ip)
return cnt;
return -1;
}
void printaps(aps, opts)
ap_session_t *aps;
int opts;
{
ap_session_t ap;
aproxy_t apr;
raudio_t ra;
if (kmemcpy((char *)&ap, (long)aps, sizeof(ap)))
return;
if (kmemcpy((char *)&apr, (long)ap.aps_apr, sizeof(apr)))
return;
printf("\tproxy %s/%d use %d flags %x\n", apr.apr_label,
apr.apr_p, apr.apr_ref, apr.apr_flags);
printf("\t\tproto %d flags %#x bytes ", ap.aps_p, ap.aps_flags);
#ifdef USE_QUAD_T
printf("%qu pkts %qu", ap.aps_bytes, ap.aps_pkts);
#else
printf("%lu pkts %lu", ap.aps_bytes, ap.aps_pkts);
#endif
printf(" data %p psiz %d\n", ap.aps_data, ap.aps_psiz);
if ((ap.aps_p == IPPROTO_TCP) && (opts & OPT_VERBOSE)) {
printf("\t\tstate[%u,%u], sel[%d,%d]\n",
ap.aps_state[0], ap.aps_state[1],
ap.aps_sel[0], ap.aps_sel[1]);
#if (defined(NetBSD) && (NetBSD >= 199905) && (NetBSD < 1991011)) || \
(__FreeBSD_version >= 300000) || defined(OpenBSD)
printf("\t\tseq: off %hd/%hd min %x/%x\n",
ap.aps_seqoff[0], ap.aps_seqoff[1],
ap.aps_seqmin[0], ap.aps_seqmin[1]);
printf("\t\tack: off %hd/%hd min %x/%x\n",
ap.aps_ackoff[0], ap.aps_ackoff[1],
ap.aps_ackmin[0], ap.aps_ackmin[1]);
#else
printf("\t\tseq: off %hd/%hd min %lx/%lx\n",
ap.aps_seqoff[0], ap.aps_seqoff[1],
ap.aps_seqmin[0], ap.aps_seqmin[1]);
printf("\t\tack: off %hd/%hd min %lx/%lx\n",
ap.aps_ackoff[0], ap.aps_ackoff[1],
ap.aps_ackmin[0], ap.aps_ackmin[1]);
#endif
}
if (!strcmp(apr.apr_label, "raudio") && ap.aps_psiz == sizeof(ra)) {
if (kmemcpy((char *)&ra, (long)ap.aps_data, sizeof(ra)))
return;
printf("\tReal Audio Proxy:\n");
printf("\t\tSeen PNA: %d\tVersion: %d\tEOS: %d\n",
ra.rap_seenpna, ra.rap_version, ra.rap_eos);
printf("\t\tMode: %#x\tSBF: %#x\n", ra.rap_mode, ra.rap_sbf);
printf("\t\tPorts:pl %hu, pr %hu, sr %hu\n",
ra.rap_plport, ra.rap_prport, ra.rap_srport);
}
}
/*
* Get a nat filter type given its kernel address.
*/
char *getnattype(ipnat)
ipnat_t *ipnat;
{
char *which;
ipnat_t ipnatbuff;
if (!ipnat || (ipnat && kmemcpy((char *)&ipnatbuff, (long)ipnat,
sizeof(ipnatbuff))))
return "???";
switch (ipnatbuff.in_redir)
{
case NAT_MAP :
which = "MAP";
break;
case NAT_MAPBLK :
which = "MAP-BLOCK";
break;
case NAT_REDIRECT :
which = "RDR";
break;
case NAT_BIMAP :
which = "BIMAP";
break;
default :
which = "unknown";
break;
}
return which;
}
void dostats(fd, opts)
int fd, opts;
{
natstat_t ns;
ipnat_t ipn;
nat_t **nt[2], *np, nat;
int i = 0;
bzero((char *)&ns, sizeof(ns));
if (!(opts & OPT_NODO) && ioctl(fd, SIOCGNATS, &ns) == -1) {
perror("ioctl(SIOCGNATS)");
return;
}
if (opts & OPT_STAT) {
printf("mapped\tin\t%lu\tout\t%lu\n",
ns.ns_mapped[0], ns.ns_mapped[1]);
printf("added\t%lu\texpired\t%lu\n",
ns.ns_added, ns.ns_expire);
printf("inuse\t%lu\nrules\t%lu\n", ns.ns_inuse, ns.ns_rules);
if (opts & OPT_VERBOSE)
printf("table %p list %p\n", ns.ns_table, ns.ns_list);
}
if (opts & OPT_LIST) {
printf("List of active MAP/Redirect filters:\n");
while (ns.ns_list) {
if (kmemcpy((char *)&ipn, (long)ns.ns_list,
sizeof(ipn))) {
perror("kmemcpy");
break;
}
if (opts & OPT_HITS)
printf("%d ", ipn.in_hits);
printnat(&ipn, opts & OPT_VERBOSE, (void *)ns.ns_list);
ns.ns_list = ipn.in_next;
}
nt[0] = (nat_t **)malloc(sizeof(*nt) * NAT_SIZE);
if (kmemcpy((char *)nt[0], (long)ns.ns_table[0],
sizeof(**nt) * NAT_SIZE)) {
perror("kmemcpy");
return;
}
printf("\nList of active sessions:\n");
for (np = ns.ns_instances; np; np = nat.nat_next) {
if (kmemcpy((char *)&nat, (long)np, sizeof(nat)))
break;
printf("%s %-15s %-5hu <- ->", getnattype(nat.nat_ptr),
inet_ntoa(nat.nat_inip), ntohs(nat.nat_inport));
printf(" %-15s %-5hu", inet_ntoa(nat.nat_outip),
ntohs(nat.nat_outport));
printf(" [%s %hu]", inet_ntoa(nat.nat_oip),
ntohs(nat.nat_oport));
if (opts & OPT_VERBOSE) {
printf("\n\tage %lu use %hu sumd %s/",
nat.nat_age, nat.nat_use,
getsumd(nat.nat_sumd[0]));
printf("%s pr %u bkt %d flags %x ",
getsumd(nat.nat_sumd[1]), nat.nat_p,
i, nat.nat_flags);
#ifdef USE_QUAD_T
printf("bytes %qu pkts %qu",
nat.nat_bytes, nat.nat_pkts);
#else
printf("bytes %lu pkts %lu",
nat.nat_bytes, nat.nat_pkts);
#endif
#if SOLARIS
printf(" %lx", nat.nat_ipsumd);
#endif
}
putchar('\n');
if (nat.nat_aps)
printaps(nat.nat_aps, opts);
}
free(nt[0]);
}
}
u_32_t hostmask(msk)
char *msk;
{
int bits = -1;
u_32_t mask;
if (!isdigit(*msk))
return (u_32_t)-1;
if (strchr(msk, '.'))
return inet_addr(msk);
if (strchr(msk, 'x'))
return (u_32_t)strtol(msk, NULL, 0);
/*
* set x most significant bits
*/
for (mask = 0, bits = atoi(msk); bits; bits--) {
mask /= 2;
mask |= ntohl(inet_addr("128.0.0.0"));
}
mask = htonl(mask);
return mask;
}
/*
* returns an ip address as a long var as a result of either a DNS lookup or
* straight inet_addr() call
*/
u_32_t hostnum(host, resolved, linenum)
char *host;
int *resolved;
int linenum;
{
struct hostent *hp;
struct netent *np;
*resolved = 0;
if (!strcasecmp("any", host))
return 0L;
if (isdigit(*host))
return inet_addr(host);
if (!(hp = gethostbyname(host))) {
if (!(np = getnetbyname(host))) {
*resolved = -1;
fprintf(stderr, "Line %d: can't resolve hostname: %s\n", linenum, host);
return 0;
}
return htonl(np->n_net);
}
return *(u_32_t *)hp->h_addr;
}
void flushtable(fd, opts)
int fd, opts;
{
int n = 0;
if (opts & OPT_FLUSH) {
n = 0;
if (!(opts & OPT_NODO) && ioctl(fd, SIOCFLNAT, &n) == -1)
perror("ioctl(SIOCFLNAT)");
else
printf("%d entries flushed from NAT table\n", n);
}
if (opts & OPT_CLEAR) {
n = 0;
if (!(opts & OPT_NODO) && ioctl(fd, SIOCCNATL, &n) == -1)
perror("ioctl(SIOCCNATL)");
else
printf("%d entries flushed from NAT list\n", n);
}
}