456 lines
11 KiB
C
456 lines
11 KiB
C
/*
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* Copyright (C) 1993-2001 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/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 "netinet/ip_compat.h"
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#include "netinet/ip_fil.h"
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#include "netinet/ip_proxy.h"
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#include "netinet/ip_nat.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[] ="@(#)ipnat.c 1.9 6/5/96 (C) 1993 Darren Reed";
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static const char rcsid[] = "@(#)$Id: ipnat.c,v 2.16.2.9 2001/07/18 15:06:33 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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#ifdef USE_INET6
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int use_inet6 = 0;
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#endif
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static 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, void *));
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void dostats __P((int, 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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char *getsumd __P((u_32_t));
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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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char *getsumd(sum)
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u_32_t sum;
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{
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static char sumdbuf[17];
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if (sum & NAT_HW_CKSUM)
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sprintf(sumdbuf, "hw(%#0x)", sum & 0xffff);
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else
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sprintf(sumdbuf, "%#0x", sum);
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return sumdbuf;
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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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int fd = -1, opts = 0, c, mode = O_RDWR;
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char *file = NULL, *core = NULL;
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while ((c = getopt(argc, argv, "CdFf:hlM: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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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 (core != NULL) {
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if (openkmem(core) == -1)
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exit(1);
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(void) setgid(getgid());
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(void) setuid(getuid());
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}
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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) && ((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 (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(fd, opts);
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return 0;
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}
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void printaps(aps, opts)
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ap_session_t *aps;
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int opts;
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{
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ap_session_t ap;
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ftpinfo_t ftp;
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aproxy_t apr;
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raudio_t ra;
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if (kmemcpy((char *)&ap, (long)aps, sizeof(ap)))
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return;
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if (kmemcpy((char *)&apr, (long)ap.aps_apr, sizeof(apr)))
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return;
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printf("\tproxy %s/%d use %d flags %x\n", apr.apr_label,
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apr.apr_p, apr.apr_ref, apr.apr_flags);
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printf("\t\tproto %d flags %#x bytes ", ap.aps_p, ap.aps_flags);
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#ifdef USE_QUAD_T
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printf("%qu pkts %qu", (unsigned long long)ap.aps_bytes,
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(unsigned long long)ap.aps_pkts);
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#else
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printf("%lu pkts %lu", ap.aps_bytes, ap.aps_pkts);
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#endif
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printf(" data %p psiz %d\n", ap.aps_data, ap.aps_psiz);
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if ((ap.aps_p == IPPROTO_TCP) && (opts & OPT_VERBOSE)) {
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printf("\t\tstate[%u,%u], sel[%d,%d]\n",
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ap.aps_state[0], ap.aps_state[1],
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ap.aps_sel[0], ap.aps_sel[1]);
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#if (defined(NetBSD) && (NetBSD >= 199905) && (NetBSD < 1991011)) || \
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(__FreeBSD_version >= 300000) || defined(OpenBSD)
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printf("\t\tseq: off %hd/%hd min %x/%x\n",
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ap.aps_seqoff[0], ap.aps_seqoff[1],
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ap.aps_seqmin[0], ap.aps_seqmin[1]);
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printf("\t\tack: off %hd/%hd min %x/%x\n",
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ap.aps_ackoff[0], ap.aps_ackoff[1],
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ap.aps_ackmin[0], ap.aps_ackmin[1]);
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#else
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printf("\t\tseq: off %hd/%hd min %lx/%lx\n",
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ap.aps_seqoff[0], ap.aps_seqoff[1],
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ap.aps_seqmin[0], ap.aps_seqmin[1]);
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printf("\t\tack: off %hd/%hd min %lx/%lx\n",
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ap.aps_ackoff[0], ap.aps_ackoff[1],
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ap.aps_ackmin[0], ap.aps_ackmin[1]);
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#endif
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}
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if (!strcmp(apr.apr_label, "raudio") && ap.aps_psiz == sizeof(ra)) {
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if (kmemcpy((char *)&ra, (long)ap.aps_data, sizeof(ra)))
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return;
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printf("\tReal Audio Proxy:\n");
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printf("\t\tSeen PNA: %d\tVersion: %d\tEOS: %d\n",
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ra.rap_seenpna, ra.rap_version, ra.rap_eos);
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printf("\t\tMode: %#x\tSBF: %#x\n", ra.rap_mode, ra.rap_sbf);
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printf("\t\tPorts:pl %hu, pr %hu, sr %hu\n",
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ra.rap_plport, ra.rap_prport, ra.rap_srport);
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} else if (!strcmp(apr.apr_label, "ftp") &&
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(ap.aps_psiz == sizeof(ftp))) {
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if (kmemcpy((char *)&ftp, (long)ap.aps_data, sizeof(ftp)))
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return;
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printf("\tFTP Proxy:\n");
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printf("\t\tpassok: %d\n", ftp.ftp_passok);
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ftp.ftp_side[0].ftps_buf[FTP_BUFSZ - 1] = '\0';
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ftp.ftp_side[1].ftps_buf[FTP_BUFSZ - 1] = '\0';
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printf("\tClient:\n");
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printf("\t\trptr %p wptr %p seq %x len %d junk %d\n",
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ftp.ftp_side[0].ftps_rptr, ftp.ftp_side[0].ftps_wptr,
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ftp.ftp_side[0].ftps_seq, ftp.ftp_side[0].ftps_len,
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ftp.ftp_side[0].ftps_junk);
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printf("\t\tbuf [");
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printbuf(ftp.ftp_side[0].ftps_buf, FTP_BUFSZ, 1);
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printf("]\n\tServer:\n");
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printf("\t\trptr %p wptr %p seq %x len %d junk %d\n",
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ftp.ftp_side[1].ftps_rptr, ftp.ftp_side[1].ftps_wptr,
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ftp.ftp_side[1].ftps_seq, ftp.ftp_side[1].ftps_len,
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ftp.ftp_side[1].ftps_junk);
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printf("\t\tbuf [");
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printbuf(ftp.ftp_side[1].ftps_buf, FTP_BUFSZ, 1);
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printf("]\n");
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}
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}
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/*
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* Get a nat filter type given its kernel address.
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*/
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char *getnattype(ipnat)
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ipnat_t *ipnat;
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{
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char *which;
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ipnat_t ipnatbuff;
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if (!ipnat || (ipnat && kmemcpy((char *)&ipnatbuff, (long)ipnat,
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sizeof(ipnatbuff))))
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return "???";
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switch (ipnatbuff.in_redir)
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{
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case NAT_MAP :
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which = "MAP";
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break;
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case NAT_MAPBLK :
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which = "MAP-BLOCK";
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break;
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case NAT_REDIRECT :
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which = "RDR";
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break;
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case NAT_BIMAP :
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which = "BIMAP";
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break;
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default :
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which = "unknown";
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break;
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}
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return which;
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}
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void dostats(fd, opts)
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int fd, opts;
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{
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hostmap_t hm, *hmp, **maptable;
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natstat_t ns, *nsp = &ns;
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nat_t **nt[2], *np, nat;
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u_int hv, hv1, hv2;
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ipnat_t ipn;
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bzero((char *)&ns, sizeof(ns));
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if (!(opts & OPT_NODO) && ioctl(fd, SIOCGNATS, &nsp) == -1) {
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perror("ioctl(SIOCGNATS)");
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return;
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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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ns.ns_mapped[0], ns.ns_mapped[1]);
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printf("added\t%lu\texpired\t%lu\n",
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ns.ns_added, ns.ns_expire);
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printf("no memory\t%lu\tbad nat\t%lu\n",
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ns.ns_memfail, ns.ns_badnat);
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printf("inuse\t%lu\nrules\t%lu\n", ns.ns_inuse, ns.ns_rules);
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printf("wilds\t%u\n", ns.ns_wilds);
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if (opts & OPT_VERBOSE)
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printf("table %p list %p\n", ns.ns_table, ns.ns_list);
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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 (ns.ns_list) {
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if (kmemcpy((char *)&ipn, (long)ns.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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(void *)ns.ns_list);
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ns.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)ns.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 = ns.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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printf("%s %-15s %-5hu <- ->", getnattype(nat.nat_ptr),
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inet_ntoa(nat.nat_inip), ntohs(nat.nat_inport));
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printf(" %-15s %-5hu", inet_ntoa(nat.nat_outip),
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ntohs(nat.nat_outport));
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printf(" [%s %hu]", inet_ntoa(nat.nat_oip),
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ntohs(nat.nat_oport));
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if (opts & OPT_VERBOSE) {
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printf("\n\tage %lu use %hu sumd %s/",
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nat.nat_age, nat.nat_use,
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getsumd(nat.nat_sumd[0]));
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hv1 = NAT_HASH_FN(nat.nat_inip.s_addr,
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nat.nat_inport,
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0xffffffff),
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hv1 = NAT_HASH_FN(nat.nat_oip.s_addr,
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hv1 + nat.nat_oport,
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NAT_TABLE_SZ),
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hv2 = NAT_HASH_FN(nat.nat_outip.s_addr,
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nat.nat_outport,
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0xffffffff),
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hv2 = NAT_HASH_FN(nat.nat_oip.s_addr,
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hv2 + nat.nat_oport,
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NAT_TABLE_SZ),
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printf("%s pr %u bkt %d/%d flags %x ",
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getsumd(nat.nat_sumd[1]), nat.nat_p,
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hv1, hv2, nat.nat_flags);
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#ifdef USE_QUAD_T
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printf("bytes %qu pkts %qu",
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(unsigned long long)nat.nat_bytes,
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(unsigned long long)nat.nat_pkts);
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#else
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printf("bytes %lu pkts %lu",
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nat.nat_bytes, nat.nat_pkts);
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#endif
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#if SOLARIS
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printf(" %lx", nat.nat_ipsumd);
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#endif
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}
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putchar('\n');
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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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printf("\nList of active host mappings:\n");
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maptable = (hostmap_t **)malloc(sizeof(hostmap_t *) *
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ns.ns_hostmap_sz);
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if (kmemcpy((char *)maptable, (u_long)ns.ns_maptable,
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sizeof(hostmap_t *) * ns.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 < ns.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,
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sizeof(hostmap_t))) {
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perror("kmemcpy (hostmap)");
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return;
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}
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printf("%s -> ",
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inet_ntoa(hm.hm_realip));
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printf("%s ", inet_ntoa(hm.hm_mapip));
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printf("(use = %d hv = %u)\n",
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hm.hm_ref, 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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free(nt[0]);
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}
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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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