807 lines
17 KiB
C
807 lines
17 KiB
C
/* $NetBSD: ipnat.c,v 1.9 1997/09/21 18:01:55 veego Exp $ */
|
|
|
|
/*
|
|
* (C)opyright 1993,1994,1995 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)
|
|
*
|
|
* Broken still:
|
|
* Displaying the nat with redirect entries is way confusing
|
|
*
|
|
* Example redirection line:
|
|
* rdr le1 0.0.0.0/0 port 79 -> 199.165.219.129 port 9901
|
|
*
|
|
* Will redirect all incoming packets on le1 to any machine, port 79 to
|
|
* host 199.165.219.129, port 9901
|
|
*/
|
|
#include <stdio.h>
|
|
#include <string.h>
|
|
#include <fcntl.h>
|
|
#if !defined(__SVR4) && !defined(__svr4__)
|
|
#include <strings.h>
|
|
#else
|
|
#include <sys/byteorder.h>
|
|
#endif
|
|
#include <sys/types.h>
|
|
#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>
|
|
#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(lint) && defined(LIBC_SCCS)
|
|
static char sccsid[] ="@(#)ipnat.c 1.9 6/5/96 (C) 1993 Darren Reed";
|
|
static char rcsid[] = "Id: ipnat.c,v 2.0.2.17 1997/09/10 13:08:21 darrenr Exp ";
|
|
#endif
|
|
|
|
#if SOLARIS
|
|
#define bzero(a,b) memset(a,0,b)
|
|
#endif
|
|
|
|
extern char *optarg;
|
|
|
|
ipnat_t *parse __P((char *));
|
|
u_long hostnum __P((char *, int *));
|
|
u_long hostmask __P((char *));
|
|
u_short portnum __P((char *, char *));
|
|
void dostats __P((int, int)), flushtable __P((int, int));
|
|
void printnat __P((ipnat_t *, int, void *));
|
|
void parsefile __P((int, char *, int));
|
|
void usage __P((char *));
|
|
int countbits __P((u_long));
|
|
char *getnattype __P((ipnat_t *));
|
|
int main __P((int, char*[]));
|
|
|
|
#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
|
|
|
|
|
|
void usage(name)
|
|
char *name;
|
|
{
|
|
fprintf(stderr, "%s: [-CFlnrsv] [-f filename]\n", name);
|
|
exit(1);
|
|
}
|
|
|
|
|
|
int main(argc, argv)
|
|
int argc;
|
|
char *argv[];
|
|
{
|
|
char *file = NULL;
|
|
int fd = -1, opts = 1, c;
|
|
|
|
while ((c = getopt(argc, argv, "CFf:lnrsv")) != -1)
|
|
switch (c)
|
|
{
|
|
case 'C' :
|
|
opts |= OPT_CLEAR;
|
|
break;
|
|
case 'f' :
|
|
file = optarg;
|
|
break;
|
|
case 'F' :
|
|
opts |= OPT_FLUSH;
|
|
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)) {
|
|
perror("open");
|
|
exit(-1);
|
|
}
|
|
|
|
if (opts & (OPT_FLUSH|OPT_CLEAR))
|
|
flushtable(fd, opts);
|
|
if (file)
|
|
parsefile(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_long ip;
|
|
{
|
|
u_long 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 printnat(np, verbose, ptr)
|
|
ipnat_t *np;
|
|
int verbose;
|
|
void *ptr;
|
|
{
|
|
int bits;
|
|
|
|
switch (np->in_redir)
|
|
{
|
|
case NAT_REDIRECT :
|
|
printf("rdr ");
|
|
break;
|
|
case NAT_MAP :
|
|
printf("map ");
|
|
break;
|
|
case NAT_BIMAP :
|
|
printf("bimap ");
|
|
break;
|
|
default :
|
|
fprintf(stderr, "unknown value for in_redir: %#x\n",
|
|
np->in_redir);
|
|
break;
|
|
}
|
|
|
|
if (np->in_redir == NAT_REDIRECT) {
|
|
printf("%s %s", np->in_ifname, inet_ntoa(np->in_out[0]));
|
|
bits = countbits(np->in_out[1].s_addr);
|
|
if (bits != -1)
|
|
printf("/%d ", bits);
|
|
else
|
|
printf("/%s ", inet_ntoa(np->in_out[1]));
|
|
if (np->in_pmin)
|
|
printf("port %d ", ntohs(np->in_pmin));
|
|
printf("-> %s", inet_ntoa(np->in_in[0]));
|
|
if (np->in_pnext)
|
|
printf(" port %d", ntohs(np->in_pnext));
|
|
if ((np->in_flags & IPN_TCPUDP) == IPN_TCPUDP)
|
|
printf(" tcp/udp");
|
|
else if ((np->in_flags & IPN_TCP) == IPN_TCP)
|
|
printf(" tcp");
|
|
else if ((np->in_flags & IPN_UDP) == IPN_UDP)
|
|
printf(" udp");
|
|
printf("\n");
|
|
if (verbose)
|
|
printf("\t%p %u %x %u %p %d\n", np->in_ifp,
|
|
np->in_space, np->in_flags, np->in_pnext, np,
|
|
np->in_use);
|
|
} else {
|
|
np->in_nextip.s_addr = htonl(np->in_nextip.s_addr);
|
|
printf("%s %s/", np->in_ifname, inet_ntoa(np->in_in[0]));
|
|
bits = countbits(np->in_in[1].s_addr);
|
|
if (bits != -1)
|
|
printf("%d ", bits);
|
|
else
|
|
printf("%s", inet_ntoa(np->in_in[1]));
|
|
printf(" -> %s/", inet_ntoa(np->in_out[0]));
|
|
bits = countbits(ntohl(np->in_out[1].s_addr));
|
|
if (bits != -1)
|
|
printf("%d ", bits);
|
|
else
|
|
printf("%s", inet_ntoa(np->in_out[1]));
|
|
if (*np->in_plabel) {
|
|
printf(" proxy");
|
|
if (np->in_dport)
|
|
printf(" %hu", ntohs(np->in_dport));
|
|
printf(" %.*s/%d", (int)sizeof(np->in_plabel),
|
|
np->in_plabel, np->in_p);
|
|
} else if (np->in_pmin || np->in_pmax) {
|
|
printf(" portmap");
|
|
if ((np->in_flags & IPN_TCPUDP) == IPN_TCPUDP)
|
|
printf(" tcp/udp");
|
|
else if (np->in_flags & IPN_TCP)
|
|
printf(" tcp");
|
|
else if (np->in_flags & IPN_UDP)
|
|
printf(" udp");
|
|
printf(" %d:%d", ntohs(np->in_pmin),
|
|
ntohs(np->in_pmax));
|
|
}
|
|
printf("\n");
|
|
if (verbose)
|
|
printf("\t%p %u %s %d %x\n", np->in_ifp,
|
|
np->in_space, inet_ntoa(np->in_nextip),
|
|
np->in_pnext, np->in_flags);
|
|
}
|
|
}
|
|
|
|
|
|
/*
|
|
* Get a nat filter type given its kernel address.
|
|
*/
|
|
char *getnattype(ipnat)
|
|
ipnat_t *ipnat;
|
|
{
|
|
char *which;
|
|
ipnat_t ipnatbuff;
|
|
|
|
if (ipnat && kmemcpy((char *)&ipnatbuff, (long)ipnat,
|
|
sizeof(ipnatbuff)))
|
|
return "???";
|
|
|
|
switch (ipnatbuff.in_redir)
|
|
{
|
|
case NAT_MAP :
|
|
which = "MAP";
|
|
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;
|
|
}
|
|
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 (i = 0; i < NAT_SIZE; i++)
|
|
for (np = nt[0][i]; np; np = nat.nat_hnext[0]) {
|
|
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));
|
|
printf(" %ld %hu %lx", nat.nat_age,
|
|
nat.nat_use, nat.nat_sumd);
|
|
#if SOLARIS
|
|
printf(" %lx", nat.nat_ipsumd);
|
|
#endif
|
|
putchar('\n');
|
|
}
|
|
free(nt[0]);
|
|
}
|
|
}
|
|
|
|
|
|
u_short portnum(name, proto)
|
|
char *name, *proto;
|
|
{
|
|
struct servent *sp, *sp2;
|
|
u_short p1 = 0;
|
|
|
|
if (isdigit(*name))
|
|
return htons((u_short)atoi(name));
|
|
if (!proto)
|
|
proto = "tcp/udp";
|
|
if (strcasecmp(proto, "tcp/udp")) {
|
|
sp = getservbyname(name, proto);
|
|
if (sp)
|
|
return sp->s_port;
|
|
(void) fprintf(stderr, "unknown service \"%s\".\n", name);
|
|
return 0;
|
|
}
|
|
sp = getservbyname(name, "tcp");
|
|
if (sp)
|
|
p1 = sp->s_port;
|
|
sp2 = getservbyname(name, "udp");
|
|
if (!sp || !sp2) {
|
|
(void) fprintf(stderr, "unknown tcp/udp service \"%s\".\n",
|
|
name);
|
|
return 0;
|
|
}
|
|
if (p1 != sp2->s_port) {
|
|
(void) fprintf(stderr, "%s %d/tcp is a different port to ",
|
|
name, p1);
|
|
(void) fprintf(stderr, "%s %d/udp\n", name, sp->s_port);
|
|
return 0;
|
|
}
|
|
return p1;
|
|
}
|
|
|
|
|
|
u_long hostmask(msk)
|
|
char *msk;
|
|
{
|
|
int bits = -1;
|
|
u_long mask;
|
|
|
|
if (!isdigit(*msk))
|
|
return (u_long)-1;
|
|
if (strchr(msk, '.'))
|
|
return inet_addr(msk);
|
|
if (strchr(msk, 'x'))
|
|
return (u_long)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_long hostnum(host, resolved)
|
|
char *host;
|
|
int *resolved;
|
|
{
|
|
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, "can't resolve hostname: %s\n", host);
|
|
return 0;
|
|
}
|
|
return np->n_net;
|
|
}
|
|
return *(u_32_t *)hp->h_addr;
|
|
}
|
|
|
|
|
|
ipnat_t *parse(line)
|
|
char *line;
|
|
{
|
|
struct protoent *pr;
|
|
static ipnat_t ipn;
|
|
char *s, *t;
|
|
char *shost, *snetm, *dhost, *proto;
|
|
char *dnetm = NULL, *dport = NULL, *tport = NULL;
|
|
int resolved;
|
|
|
|
bzero((char *)&ipn, sizeof(ipn));
|
|
if ((s = strchr(line, '\n')))
|
|
*s = '\0';
|
|
if ((s = strchr(line, '#')))
|
|
*s = '\0';
|
|
if (!*line)
|
|
return NULL;
|
|
if (!(s = strtok(line, " \t")))
|
|
return NULL;
|
|
if (!strcasecmp(s, "map"))
|
|
ipn.in_redir = NAT_MAP;
|
|
else if (!strcasecmp(s, "rdr"))
|
|
ipn.in_redir = NAT_REDIRECT;
|
|
else if (!strcasecmp(s, "bimap"))
|
|
ipn.in_redir = NAT_BIMAP;
|
|
else {
|
|
(void)fprintf(stderr,
|
|
"expected map/rdr/bimap, got \"%s\"\n", s);
|
|
return NULL;
|
|
}
|
|
|
|
if (!(s = strtok(NULL, " \t"))) {
|
|
fprintf(stderr, "missing fields (interface)\n");
|
|
return NULL;
|
|
}
|
|
strncpy(ipn.in_ifname, s, sizeof(ipn.in_ifname) - 1);
|
|
ipn.in_ifname[sizeof(ipn.in_ifname) - 1] = '\0';
|
|
if (!(s = strtok(NULL, " \t"))) {
|
|
fprintf(stderr, "missing fields (%s)\n",
|
|
ipn.in_redir ? "destination": "source");
|
|
return NULL;
|
|
}
|
|
shost = s;
|
|
|
|
if (ipn.in_redir == NAT_REDIRECT) {
|
|
if (!(s = strtok(NULL, " \t"))) {
|
|
fprintf(stderr, "missing fields (destination port)\n");
|
|
return NULL;
|
|
}
|
|
|
|
if (strcasecmp(s, "port")) {
|
|
fprintf(stderr, "missing fields (port)\n");
|
|
return NULL;
|
|
}
|
|
|
|
if (!(s = strtok(NULL, " \t"))) {
|
|
fprintf(stderr, "missing fields (destination port)\n");
|
|
return NULL;
|
|
}
|
|
|
|
dport = s;
|
|
}
|
|
|
|
|
|
if (!(s = strtok(NULL, " \t"))) {
|
|
fprintf(stderr, "missing fields (->)\n");
|
|
return NULL;
|
|
}
|
|
if (!strcmp(s, "->")) {
|
|
snetm = strrchr(shost, '/');
|
|
if (!snetm) {
|
|
fprintf(stderr, "missing fields (%s netmask)\n",
|
|
ipn.in_redir ? "destination":"source");
|
|
return NULL;
|
|
}
|
|
} else {
|
|
if (strcasecmp(s, "netmask")) {
|
|
fprintf(stderr, "missing fields (netmask)\n");
|
|
return NULL;
|
|
}
|
|
if (!(s = strtok(NULL, " \t"))) {
|
|
fprintf(stderr, "missing fields (%s netmask)\n",
|
|
ipn.in_redir ? "destination":"source");
|
|
return NULL;
|
|
}
|
|
snetm = s;
|
|
}
|
|
|
|
if (!(s = strtok(NULL, " \t"))) {
|
|
fprintf(stderr, "missing fields (%s)\n",
|
|
ipn.in_redir ? "destination":"target");
|
|
return NULL;
|
|
}
|
|
dhost = s;
|
|
|
|
if (ipn.in_redir & NAT_MAP) {
|
|
if (!(s = strtok(NULL, " \t"))) {
|
|
dnetm = strrchr(dhost, '/');
|
|
if (!dnetm) {
|
|
fprintf(stderr,
|
|
"missing fields (dest netmask)\n");
|
|
return NULL;
|
|
}
|
|
}
|
|
if (!s || !strcasecmp(s, "portmap") ||
|
|
!strcasecmp(s, "proxy")) {
|
|
dnetm = strrchr(dhost, '/');
|
|
if (!dnetm) {
|
|
fprintf(stderr,
|
|
"missing fields (dest netmask)\n");
|
|
return NULL;
|
|
}
|
|
} else {
|
|
if (strcasecmp(s, "netmask")) {
|
|
fprintf(stderr,
|
|
"missing fields (dest netmask)\n");
|
|
return NULL;
|
|
}
|
|
if (!(s = strtok(NULL, " \t"))) {
|
|
fprintf(stderr,
|
|
"missing fields (dest netmask)\n");
|
|
return NULL;
|
|
}
|
|
dnetm = s;
|
|
}
|
|
if (*dnetm == '/')
|
|
*dnetm++ = '\0';
|
|
} else {
|
|
/* If it's a in_redir, expect target port */
|
|
if (!(s = strtok(NULL, " \t"))) {
|
|
fprintf(stderr, "missing fields (destination port)\n");
|
|
return NULL;
|
|
}
|
|
|
|
if (strcasecmp(s, "port")) {
|
|
fprintf(stderr, "missing fields (port)\n");
|
|
return NULL;
|
|
}
|
|
|
|
if (!(s = strtok(NULL, " \t"))) {
|
|
fprintf(stderr, "missing fields (destination port)\n");
|
|
return NULL;
|
|
}
|
|
tport = s;
|
|
}
|
|
|
|
|
|
if (*snetm == '/')
|
|
*snetm++ = '\0';
|
|
|
|
if (ipn.in_redir & NAT_MAP) {
|
|
ipn.in_inip = hostnum(shost, &resolved);
|
|
if (resolved == -1)
|
|
return NULL;
|
|
ipn.in_inmsk = hostmask(snetm);
|
|
ipn.in_outip = hostnum(dhost, &resolved);
|
|
if (resolved == -1)
|
|
return NULL;
|
|
ipn.in_outmsk = hostmask(dnetm);
|
|
} else {
|
|
ipn.in_inip = hostnum(dhost, &resolved); /* Inside is target */
|
|
if (resolved == -1)
|
|
return NULL;
|
|
ipn.in_inmsk = hostmask("255.255.255.255");
|
|
ipn.in_outip = hostnum(shost, &resolved);
|
|
if (resolved == -1)
|
|
return NULL;
|
|
ipn.in_outmsk = hostmask(snetm);
|
|
if (!(s = strtok(NULL, " \t"))) {
|
|
ipn.in_flags = IPN_TCP; /* XXX- TCP only by default */
|
|
proto = "tcp";
|
|
} else {
|
|
if (!strcasecmp(s, "tcp"))
|
|
ipn.in_flags = IPN_TCP;
|
|
else if (!strcasecmp(s, "udp"))
|
|
ipn.in_flags = IPN_UDP;
|
|
else if (!strcasecmp(s, "tcp/udp"))
|
|
ipn.in_flags = IPN_TCPUDP;
|
|
else if (!strcasecmp(s, "tcpudp"))
|
|
ipn.in_flags = IPN_TCPUDP;
|
|
else {
|
|
fprintf(stderr,
|
|
"expected protocol - got \"%s\"\n", s);
|
|
return NULL;
|
|
}
|
|
proto = s;
|
|
if ((s = strtok(NULL, " \t"))) {
|
|
fprintf(stderr,
|
|
"extra junk at the end of rdr: %s\n",
|
|
s);
|
|
return NULL;
|
|
}
|
|
}
|
|
ipn.in_pmin = portnum(dport, proto); /* dest port */
|
|
ipn.in_pmax = ipn.in_pmin; /* NECESSARY of removing nats */
|
|
ipn.in_pnext = portnum(tport, proto); /* target port */
|
|
s = NULL; /* That's all she wrote! */
|
|
}
|
|
ipn.in_inip &= ipn.in_inmsk;
|
|
ipn.in_outip &= ipn.in_outmsk;
|
|
|
|
if (!s)
|
|
return &ipn;
|
|
|
|
if (ipn.in_redir == NAT_BIMAP) {
|
|
fprintf(stderr, "extra words at the end of bimap line: %s\n",
|
|
s);
|
|
return NULL;
|
|
}
|
|
if (!strcasecmp(s, "proxy")) {
|
|
if (!(s = strtok(NULL, " \t"))) {
|
|
fprintf(stderr, "missing parameter for \"proxy\"\n");
|
|
return NULL;
|
|
}
|
|
dport = NULL;
|
|
|
|
if (!strcasecmp(s, "port")) {
|
|
if (!(s = strtok(NULL, " \t"))) {
|
|
fprintf(stderr,
|
|
"missing parameter for \"port\"\n");
|
|
return NULL;
|
|
}
|
|
|
|
dport = s;
|
|
|
|
if (!(s = strtok(NULL, " \t"))) {
|
|
fprintf(stderr,
|
|
"missing parameter for \"proxy\"\n");
|
|
return NULL;
|
|
}
|
|
}
|
|
if ((proto = index(s, '/'))) {
|
|
*proto++ = '\0';
|
|
if ((pr = getprotobyname(proto)))
|
|
ipn.in_p = pr->p_proto;
|
|
else
|
|
ipn.in_p = atoi(proto);
|
|
if (dport)
|
|
ipn.in_dport = portnum(dport, proto);
|
|
} else {
|
|
ipn.in_p = 0;
|
|
if (dport)
|
|
ipn.in_dport = portnum(dport, NULL);
|
|
}
|
|
|
|
(void) strncpy(ipn.in_plabel, s, sizeof(ipn.in_plabel));
|
|
if ((s = strtok(NULL, " \t"))) {
|
|
fprintf(stderr, "too many parameters for \"proxy\"\n");
|
|
return NULL;
|
|
}
|
|
return &ipn;
|
|
|
|
}
|
|
if (strcasecmp(s, "portmap")) {
|
|
fprintf(stderr, "expected \"portmap\" - got \"%s\"\n", s);
|
|
return NULL;
|
|
}
|
|
if (!(s = strtok(NULL, " \t")))
|
|
return NULL;
|
|
if (!strcasecmp(s, "tcp"))
|
|
ipn.in_flags = IPN_TCP;
|
|
else if (!strcasecmp(s, "udp"))
|
|
ipn.in_flags = IPN_UDP;
|
|
else if (!strcasecmp(s, "tcpudp"))
|
|
ipn.in_flags = IPN_TCPUDP;
|
|
else if (!strcasecmp(s, "tcp/udp"))
|
|
ipn.in_flags = IPN_TCPUDP;
|
|
else {
|
|
fprintf(stderr, "expected protocol name - got \"%s\"\n", s);
|
|
return NULL;
|
|
}
|
|
proto = s;
|
|
if (!(s = strtok(NULL, " \t"))) {
|
|
fprintf(stderr, "no port range found\n");
|
|
return NULL;
|
|
}
|
|
if (!(t = strchr(s, ':'))) {
|
|
fprintf(stderr, "no port range in \"%s\"\n", s);
|
|
return NULL;
|
|
}
|
|
*t++ = '\0';
|
|
ipn.in_pmin = portnum(s, proto);
|
|
ipn.in_pmax = portnum(t, proto);
|
|
return &ipn;
|
|
}
|
|
|
|
|
|
void parsefile(fd, file, opts)
|
|
int fd;
|
|
char *file;
|
|
int opts;
|
|
{
|
|
char line[512], *s;
|
|
ipnat_t *np;
|
|
FILE *fp;
|
|
int linenum = 1;
|
|
|
|
if (strcmp(file, "-"))
|
|
fp = fopen(file, "r");
|
|
else
|
|
fp = stdin;
|
|
|
|
while (fgets(line, sizeof(line) - 1, fp)) {
|
|
line[sizeof(line) - 1] = '\0';
|
|
if ((s = strchr(line, '\n')))
|
|
*s = '\0';
|
|
if (!(np = parse(line))) {
|
|
if (*line)
|
|
fprintf(stderr, "%d: syntax error in \"%s\"\n",
|
|
linenum, line);
|
|
} else if (!(opts & OPT_NODO)) {
|
|
if ((opts & OPT_VERBOSE) && np)
|
|
printnat(np, opts & OPT_VERBOSE, NULL);
|
|
if (opts & OPT_REM) {
|
|
if (ioctl(fd, SIOCADNAT, np) == -1)
|
|
perror("ioctl(SIOCADNAT)");
|
|
} else if (ioctl(fd, SIOCRMNAT, np) == -1)
|
|
perror("ioctl(SIOCRMNAT)");
|
|
}
|
|
linenum++;
|
|
}
|
|
fclose(stdin);
|
|
}
|
|
|
|
|
|
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);
|
|
}
|
|
}
|