499 lines
10 KiB
C
499 lines
10 KiB
C
/* $NetBSD: ipnat.c,v 1.1.1.4 2007/04/14 20:17:34 martin Exp $ */
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/*
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* Copyright (C) 2001-2006 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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#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/file.h>
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#define _KERNEL
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#include <sys/uio.h>
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#undef _KERNEL
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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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#if defined(linux)
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# include <linux/a.out.h>
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#else
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# include <nlist.h>
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#endif
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#include "ipf.h"
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#include "netinet/ipl.h"
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#include "kmem.h"
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#ifdef __hpux
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# define nlist nlist64
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#endif
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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[] ="@(#)ipnat.c 1.9 6/5/96 (C) 1993 Darren Reed";
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static const char rcsid[] = "@(#)Id: ipnat.c,v 1.24.2.5 2006/12/12 16:13:01 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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void dostats __P((int, natstat_t *, int, int));
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void flushtable __P((int, int));
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void usage __P((char *));
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int main __P((int, char*[]));
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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 dostats_live __P((int, natstat_t *, int));
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void showhostmap_dead __P((natstat_t *));
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void showhostmap_live __P((int, natstat_t *));
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void dostats_dead __P((natstat_t *, int));
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int opts;
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void usage(name)
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char *name;
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{
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fprintf(stderr, "Usage: %s [-CFhlnrRsv] [-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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char *file, *core, *kernel;
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natstat_t ns, *nsp;
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int fd, c, mode;
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ipfobj_t obj;
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fd = -1;
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opts = 0;
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nsp = &ns;
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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:nrRsv")) != -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_DONOTHING;
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mode = O_RDONLY;
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break;
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case 'R' :
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opts |= OPT_NORESOLVE;
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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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initparse();
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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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if (!(opts & OPT_DONOTHING)) {
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if (((fd = open(IPNAT_NAME, mode)) == -1) &&
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((fd = open(IPNAT_NAME, O_RDONLY)) == -1)) {
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(void) fprintf(stderr, "%s: open: %s\n", IPNAT_NAME,
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STRERROR(errno));
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exit(1);
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}
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}
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bzero((char *)&ns, sizeof(ns));
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if ((opts & OPT_DONOTHING) == 0) {
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if (checkrev(IPL_NAME) == -1) {
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fprintf(stderr, "User/kernel version check failed\n");
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exit(1);
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}
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}
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if (!(opts & OPT_DONOTHING) && (kernel == NULL) && (core == NULL)) {
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bzero((char *)&obj, sizeof(obj));
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obj.ipfo_rev = IPFILTER_VERSION;
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obj.ipfo_type = IPFOBJ_NATSTAT;
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obj.ipfo_size = sizeof(*nsp);
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obj.ipfo_ptr = (void *)nsp;
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if (ioctl(fd, SIOCGNATS, &obj) == -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(fd, nsp, opts, 0);
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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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ipnat_parsefile(fd, ipnat_addrule, ioctl, file);
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}
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if (opts & (OPT_LIST|OPT_STAT))
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dostats(fd, nsp, opts, 1);
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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 userland, 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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* 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_DONOTHING) && 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_DONOTHING) && 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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/*
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* Display NAT statistics.
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*/
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void dostats_dead(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 *np, nat;
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ipnat_t ipn;
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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("%lu ", 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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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, 0, nsp->ns_ticks);
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if (nat.nat_aps)
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printaps(nat.nat_aps, opts);
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}
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if (opts & OPT_VERBOSE)
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showhostmap_dead(nsp);
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}
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void dostats(fd, nsp, opts, alive)
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natstat_t *nsp;
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int fd, opts, alive;
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{
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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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if (opts & OPT_LIST) {
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if (alive)
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dostats_live(fd, nsp, opts);
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else
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dostats_dead(nsp, opts);
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}
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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_live(fd, nsp, opts)
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natstat_t *nsp;
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int fd, opts;
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{
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ipfgeniter_t iter;
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ipfobj_t obj;
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ipnat_t ipn;
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nat_t nat;
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bzero((char *)&obj, sizeof(obj));
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obj.ipfo_rev = IPFILTER_VERSION;
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obj.ipfo_type = IPFOBJ_GENITER;
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obj.ipfo_size = sizeof(iter);
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obj.ipfo_ptr = &iter;
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iter.igi_type = IPFGENITER_IPNAT;
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iter.igi_nitems = 1;
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iter.igi_data = &ipn;
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/*
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* Show list of NAT rules and NAT sessions ?
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*/
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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 (ioctl(fd, SIOCGENITER, &obj) == -1)
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break;
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if (opts & OPT_HITS)
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printf("%lu ", 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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printf("\nList of active sessions:\n");
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iter.igi_type = IPFGENITER_NAT;
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iter.igi_nitems = 1;
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iter.igi_data = &nat;
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while (nsp->ns_instances != NULL) {
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if (ioctl(fd, SIOCGENITER, &obj) == -1)
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break;
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printactivenat(&nat, opts, 1, nsp->ns_ticks);
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if (nat.nat_aps)
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printaps(nat.nat_aps, opts);
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nsp->ns_instances = nat.nat_next;
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}
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if (opts & OPT_VERBOSE)
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showhostmap_live(fd, nsp);
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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_dead(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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* Display the active host mapping table.
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*/
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void showhostmap_live(fd, nsp)
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int fd;
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natstat_t *nsp;
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{
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ipfgeniter_t iter;
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hostmap_t hm;
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ipfobj_t obj;
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bzero((char *)&obj, sizeof(obj));
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obj.ipfo_rev = IPFILTER_VERSION;
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obj.ipfo_type = IPFOBJ_GENITER;
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obj.ipfo_size = sizeof(iter);
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obj.ipfo_ptr = &iter;
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iter.igi_type = IPFGENITER_HOSTMAP;
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iter.igi_nitems = 1;
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iter.igi_data = &hm;
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printf("\nList of active host mappings:\n");
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while (nsp->ns_maplist != NULL) {
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if (ioctl(fd, SIOCGENITER, &obj) == -1)
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break;
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printhostmap(&hm, 0);
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nsp->ns_maplist = hm.hm_next;
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}
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}
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