393 lines
8.5 KiB
C
393 lines
8.5 KiB
C
/* $NetBSD: ipnat.c,v 1.10 2002/04/09 02:32:52 thorpej Exp $ */
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/*
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* Copyright (C) 1993-2002 by Darren Reed.
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*
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* See the IPFILTER.LICENCE file for details on licencing.
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*
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* Added redirect stuff and a variety of bug fixes. (mcn@EnGarde.com)
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*/
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#ifdef __sgi
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# include <sys/ptimers.h>
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#endif
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#include <stdio.h>
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#include <string.h>
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#include <fcntl.h>
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#include <errno.h>
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#include <sys/types.h>
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#if !defined(__SVR4) && !defined(__svr4__)
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#include <strings.h>
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#else
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#include <sys/byteorder.h>
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#endif
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#include <sys/time.h>
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#include <sys/param.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <stddef.h>
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#include <sys/socket.h>
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#include <sys/ioctl.h>
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#if defined(sun) && (defined(__svr4__) || defined(__SVR4))
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# include <sys/ioccom.h>
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# include <sys/sysmacros.h>
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#endif
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#include <netinet/in.h>
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#include <netinet/in_systm.h>
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#include <netinet/ip.h>
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#include <netinet/tcp.h>
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#include <net/if.h>
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#if __FreeBSD_version >= 300000
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# include <net/if_var.h>
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#endif
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#include <netdb.h>
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#include <arpa/nameser.h>
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#include <arpa/inet.h>
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#include <resolv.h>
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#include <ctype.h>
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#include <nlist.h>
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#include "netinet/ip_compat.h"
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#include "netinet/ip_fil.h"
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#include "netinet/ip_nat.h"
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#include "netinet/ip_state.h"
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#include "netinet/ip_proxy.h"
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#include "ipf.h"
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#include "kmem.h"
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#if defined(sun) && !SOLARIS2
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# define STRERROR(x) sys_errlist[x]
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extern char *sys_errlist[];
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#else
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# define STRERROR(x) strerror(x)
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#endif
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#if !defined(lint)
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static const char sccsid[] __attribute__((__unused__)) =
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"@(#)ipnat.c 1.9 6/5/96 (C) 1993 Darren Reed";
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static const char rcsid[] __attribute__((__unused__)) =
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"@(#)Id: ipnat.c,v 2.16.2.20 2002/02/22 15:32:55 darrenr Exp";
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#endif
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#if SOLARIS
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#define bzero(a,b) memset(a,0,b)
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#endif
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int use_inet6 = 0;
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char thishost[MAXHOSTNAMELEN];
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extern char *optarg;
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extern ipnat_t *natparse __P((char *, int));
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extern void natparsefile __P((int, char *, int));
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extern void printnat __P((ipnat_t *, int));
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extern void printactivenat __P((nat_t *, int));
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extern void printhostmap __P((hostmap_t *, u_int));
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extern char *getsumd __P((u_32_t));
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void dostats __P((natstat_t *, int)), flushtable __P((int, int));
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void usage __P((char *));
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int countbits __P((u_32_t));
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char *getnattype __P((ipnat_t *));
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int main __P((int, char*[]));
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void printaps __P((ap_session_t *, int));
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void showhostmap __P((natstat_t *nsp));
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void natstat_dead __P((natstat_t *, char *));
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void usage(name)
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char *name;
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{
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fprintf(stderr, "%s: [-CFhlnrsv] [-f filename]\n", name);
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exit(1);
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}
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int main(argc, argv)
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int argc;
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char *argv[];
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{
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natstat_t ns, *nsp = &ns;
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char *file, *core, *kernel;
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int fd, opts, c, mode;
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fd = -1;
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opts = 0;
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file = NULL;
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core = NULL;
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kernel = NULL;
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mode = O_RDWR;
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while ((c = getopt(argc, argv, "CdFf:hlM:N:nrsv")) != -1)
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switch (c)
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{
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case 'C' :
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opts |= OPT_CLEAR;
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break;
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case 'd' :
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opts |= OPT_DEBUG;
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break;
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case 'f' :
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file = optarg;
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break;
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case 'F' :
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opts |= OPT_FLUSH;
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break;
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case 'h' :
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opts |=OPT_HITS;
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break;
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case 'l' :
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opts |= OPT_LIST;
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mode = O_RDONLY;
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break;
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case 'M' :
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core = optarg;
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break;
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case 'N' :
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kernel = optarg;
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break;
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case 'n' :
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opts |= OPT_NODO;
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mode = O_RDONLY;
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break;
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case 'r' :
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opts |= OPT_REMOVE;
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break;
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case 's' :
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opts |= OPT_STAT;
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mode = O_RDONLY;
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break;
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case 'v' :
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opts |= OPT_VERBOSE;
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break;
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default :
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usage(argv[0]);
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}
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if ((kernel != NULL) || (core != NULL)) {
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(void) setgid(getgid());
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(void) setuid(getuid());
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}
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bzero((char *)&ns, sizeof(ns));
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gethostname(thishost, sizeof(thishost));
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thishost[sizeof(thishost) - 1] = '\0';
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if (!(opts & OPT_NODO) && (kernel == NULL) && (core == NULL)) {
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if (openkmem(kernel, core) == -1)
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exit(1);
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if (((fd = open(IPL_NAT, mode)) == -1) &&
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((fd = open(IPL_NAT, O_RDONLY)) == -1)) {
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(void) fprintf(stderr, "%s: open: %s\n", IPL_NAT,
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STRERROR(errno));
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exit(1);
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}
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if (ioctl(fd, SIOCGNATS, &nsp) == -1) {
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perror("ioctl(SIOCGNATS)");
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exit(1);
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}
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(void) setgid(getgid());
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(void) setuid(getuid());
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} else if ((kernel != NULL) || (core != NULL)) {
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if (openkmem(kernel, core) == -1)
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exit(1);
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natstat_dead(nsp, kernel);
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if (opts & (OPT_LIST|OPT_STAT))
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dostats(nsp, opts);
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exit(0);
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}
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if (opts & (OPT_FLUSH|OPT_CLEAR))
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flushtable(fd, opts);
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if (file)
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natparsefile(fd, file, opts);
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if (opts & (OPT_LIST|OPT_STAT))
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dostats(nsp, opts);
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return 0;
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}
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/*
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* Read nat statistic information in using a symbol table and memory file
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* rather than doing ioctl's.
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*/
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void natstat_dead(nsp, kernel)
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natstat_t *nsp;
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char *kernel;
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{
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struct nlist nat_nlist[10] = {
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{ "nat_table" }, /* 0 */
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{ "nat_list" },
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{ "maptable" },
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{ "ipf_nattable_sz" },
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{ "ipf_natrules_sz" },
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{ "ipf_rdrrules_sz" }, /* 5 */
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{ "ipf_hostmap_sz" },
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{ "nat_instances" },
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{ "ap_sess_list" },
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{ NULL }
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};
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void *tables[2];
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if (nlist(kernel, nat_nlist) == -1) {
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fprintf(stderr, "nlist error\n");
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return;
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}
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/*
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* Normally the ioctl copies all of these values into the structure
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* for us, before returning it to useland, so here we must copy each
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* one in individually.
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*/
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kmemcpy((char *)&tables, nat_nlist[0].n_value, sizeof(tables));
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nsp->ns_table[0] = tables[0];
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nsp->ns_table[1] = tables[1];
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kmemcpy((char *)&nsp->ns_list, nat_nlist[1].n_value,
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sizeof(nsp->ns_list));
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kmemcpy((char *)&nsp->ns_maptable, nat_nlist[2].n_value,
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sizeof(nsp->ns_maptable));
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kmemcpy((char *)&nsp->ns_nattab_sz, nat_nlist[3].n_value,
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sizeof(nsp->ns_nattab_sz));
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kmemcpy((char *)&nsp->ns_rultab_sz, nat_nlist[4].n_value,
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sizeof(nsp->ns_rultab_sz));
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kmemcpy((char *)&nsp->ns_rdrtab_sz, nat_nlist[5].n_value,
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sizeof(nsp->ns_rdrtab_sz));
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kmemcpy((char *)&nsp->ns_hostmap_sz, nat_nlist[6].n_value,
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sizeof(nsp->ns_hostmap_sz));
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kmemcpy((char *)&nsp->ns_instances, nat_nlist[7].n_value,
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sizeof(nsp->ns_instances));
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kmemcpy((char *)&nsp->ns_apslist, nat_nlist[8].n_value,
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sizeof(nsp->ns_apslist));
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}
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/*
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* Display NAT statistics.
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*/
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void dostats(nsp, opts)
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natstat_t *nsp;
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int opts;
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{
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nat_t **nt[2], *np, nat;
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ipnat_t ipn;
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/*
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* Show statistics ?
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*/
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if (opts & OPT_STAT) {
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printf("mapped\tin\t%lu\tout\t%lu\n",
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nsp->ns_mapped[0], nsp->ns_mapped[1]);
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printf("added\t%lu\texpired\t%lu\n",
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nsp->ns_added, nsp->ns_expire);
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printf("no memory\t%lu\tbad nat\t%lu\n",
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nsp->ns_memfail, nsp->ns_badnat);
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printf("inuse\t%lu\nrules\t%lu\n",
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nsp->ns_inuse, nsp->ns_rules);
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printf("wilds\t%u\n", nsp->ns_wilds);
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if (opts & OPT_VERBOSE)
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printf("table %p list %p\n",
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nsp->ns_table, nsp->ns_list);
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}
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/*
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* Show list of NAT rules and NAT sessions ?
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*/
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if (opts & OPT_LIST) {
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printf("List of active MAP/Redirect filters:\n");
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while (nsp->ns_list) {
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if (kmemcpy((char *)&ipn, (long)nsp->ns_list,
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sizeof(ipn))) {
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perror("kmemcpy");
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break;
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}
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if (opts & OPT_HITS)
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printf("%d ", ipn.in_hits);
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printnat(&ipn, opts & (OPT_DEBUG|OPT_VERBOSE));
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nsp->ns_list = ipn.in_next;
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}
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nt[0] = (nat_t **)malloc(sizeof(*nt) * NAT_SIZE);
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if (kmemcpy((char *)nt[0], (long)nsp->ns_table[0],
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sizeof(**nt) * NAT_SIZE)) {
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perror("kmemcpy");
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return;
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}
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printf("\nList of active sessions:\n");
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for (np = nsp->ns_instances; np; np = nat.nat_next) {
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if (kmemcpy((char *)&nat, (long)np, sizeof(nat)))
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break;
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printactivenat(&nat, opts);
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}
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if (opts & OPT_VERBOSE)
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showhostmap(nsp);
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free(nt[0]);
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}
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}
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/*
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* display the active host mapping table.
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*/
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void showhostmap(nsp)
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natstat_t *nsp;
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{
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hostmap_t hm, *hmp, **maptable;
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u_int hv;
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printf("\nList of active host mappings:\n");
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maptable = (hostmap_t **)malloc(sizeof(hostmap_t *) *
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nsp->ns_hostmap_sz);
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if (kmemcpy((char *)maptable, (u_long)nsp->ns_maptable,
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sizeof(hostmap_t *) * nsp->ns_hostmap_sz)) {
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perror("kmemcpy (maptable)");
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return;
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}
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for (hv = 0; hv < nsp->ns_hostmap_sz; hv++) {
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hmp = maptable[hv];
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while (hmp) {
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if (kmemcpy((char *)&hm, (u_long)hmp, sizeof(hm))) {
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perror("kmemcpy (hostmap)");
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return;
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}
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printhostmap(&hm, hv);
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hmp = hm.hm_next;
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}
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}
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free(maptable);
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}
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/*
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* Issue an ioctl to flush either the NAT rules table or the active mapping
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* table or both.
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*/
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void flushtable(fd, opts)
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int fd, opts;
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{
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int n = 0;
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if (opts & OPT_FLUSH) {
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n = 0;
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if (!(opts & OPT_NODO) && ioctl(fd, SIOCIPFFL, &n) == -1)
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perror("ioctl(SIOCFLNAT)");
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else
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printf("%d entries flushed from NAT table\n", n);
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}
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if (opts & OPT_CLEAR) {
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n = 1;
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if (!(opts & OPT_NODO) && ioctl(fd, SIOCIPFFL, &n) == -1)
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perror("ioctl(SIOCCNATL)");
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else
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printf("%d entries flushed from NAT list\n", n);
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}
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}
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