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-rw-r--r--tools/ipnat.c576
1 files changed, 576 insertions, 0 deletions
diff --git a/tools/ipnat.c b/tools/ipnat.c
new file mode 100644
index 0000000..038df6d
--- /dev/null
+++ b/tools/ipnat.c
@@ -0,0 +1,576 @@
+/*
+ * Copyright (C) 2001-2006 by Darren Reed.
+ *
+ * See the IPFILTER.LICENCE file for details on licencing.
+ *
+ * Added redirect stuff and a variety of bug fixes. (mcn@EnGarde.com)
+ */
+#include <stdio.h>
+#include <string.h>
+#include <fcntl.h>
+#include <errno.h>
+#include <sys/types.h>
+#if !defined(__SVR4) && !defined(__svr4__)
+#include <strings.h>
+#else
+#include <sys/byteorder.h>
+#endif
+#include <sys/time.h>
+#include <sys/param.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <stddef.h>
+#include <sys/file.h>
+#define _KERNEL
+#include <sys/uio.h>
+#undef _KERNEL
+#include <sys/socket.h>
+#include <sys/ioctl.h>
+#if defined(sun) && (defined(__svr4__) || defined(__SVR4))
+# include <sys/ioccom.h>
+# include <sys/sysmacros.h>
+#endif
+#include <netinet/in.h>
+#include <netinet/in_systm.h>
+#include <netinet/ip.h>
+#include <netinet/tcp.h>
+#include <net/if.h>
+#if __FreeBSD_version >= 300000
+# include <net/if_var.h>
+#endif
+#include <netdb.h>
+#include <arpa/nameser.h>
+#include <arpa/inet.h>
+#include <resolv.h>
+#include <ctype.h>
+#if defined(linux)
+# include <linux/a.out.h>
+#else
+# include <nlist.h>
+#endif
+#include "ipf.h"
+#include "netinet/ipl.h"
+#include "kmem.h"
+
+#ifdef __hpux
+# define nlist nlist64
+#endif
+
+#if defined(sun) && !SOLARIS2
+# define STRERROR(x) sys_errlist[x]
+extern char *sys_errlist[];
+#else
+# define STRERROR(x) strerror(x)
+#endif
+
+#if !defined(lint)
+static const char sccsid[] ="@(#)ipnat.c 1.9 6/5/96 (C) 1993 Darren Reed";
+static const char rcsid[] = "@(#)$Id: ipnat.c,v 1.24.2.11 2007/09/25 08:27:34 darrenr Exp $";
+#endif
+
+
+#if SOLARIS
+#define bzero(a,b) memset(a,0,b)
+#endif
+int use_inet6 = 0;
+char thishost[MAXHOSTNAMELEN];
+
+extern char *optarg;
+
+void dostats __P((int, natstat_t *, int, int));
+void dotable __P((natstat_t *, int, int));
+void flushtable __P((int, int));
+void usage __P((char *));
+int main __P((int, char*[]));
+void showhostmap __P((natstat_t *nsp));
+void natstat_dead __P((natstat_t *, char *));
+void dostats_live __P((int, natstat_t *, int));
+void showhostmap_dead __P((natstat_t *));
+void showhostmap_live __P((int, natstat_t *));
+void dostats_dead __P((natstat_t *, int));
+void showtqtable_live __P((int));
+
+int opts;
+
+void usage(name)
+char *name;
+{
+ fprintf(stderr, "Usage: %s [-CFhlnrRsv] [-f filename]\n", name);
+ exit(1);
+}
+
+
+int main(argc, argv)
+int argc;
+char *argv[];
+{
+ char *file, *core, *kernel;
+ natstat_t ns, *nsp;
+ int fd, c, mode;
+ ipfobj_t obj;
+
+ fd = -1;
+ opts = 0;
+ nsp = &ns;
+ file = NULL;
+ core = NULL;
+ kernel = NULL;
+ mode = O_RDWR;
+
+ while ((c = getopt(argc, argv, "CdFf:hlM:N:nrRsv")) != -1)
+ switch (c)
+ {
+ case 'C' :
+ opts |= OPT_CLEAR;
+ break;
+ case 'd' :
+ opts |= OPT_DEBUG;
+ break;
+ case 'f' :
+ file = optarg;
+ break;
+ case 'F' :
+ opts |= OPT_FLUSH;
+ break;
+ case 'h' :
+ opts |=OPT_HITS;
+ break;
+ case 'l' :
+ opts |= OPT_LIST;
+ mode = O_RDONLY;
+ break;
+ case 'M' :
+ core = optarg;
+ break;
+ case 'N' :
+ kernel = optarg;
+ break;
+ case 'n' :
+ opts |= OPT_DONOTHING;
+ mode = O_RDONLY;
+ break;
+ case 'R' :
+ opts |= OPT_NORESOLVE;
+ break;
+ case 'r' :
+ opts |= OPT_REMOVE;
+ break;
+ case 's' :
+ opts |= OPT_STAT;
+ mode = O_RDONLY;
+ break;
+ case 'v' :
+ opts |= OPT_VERBOSE;
+ break;
+ default :
+ usage(argv[0]);
+ }
+
+ initparse();
+
+ if ((kernel != NULL) || (core != NULL)) {
+ (void) setgid(getgid());
+ (void) setuid(getuid());
+ }
+
+ if (!(opts & OPT_DONOTHING)) {
+ if (((fd = open(IPNAT_NAME, mode)) == -1) &&
+ ((fd = open(IPNAT_NAME, O_RDONLY)) == -1)) {
+ (void) fprintf(stderr, "%s: open: %s\n", IPNAT_NAME,
+ STRERROR(errno));
+ exit(1);
+ }
+ }
+
+ bzero((char *)&ns, sizeof(ns));
+
+ if ((opts & OPT_DONOTHING) == 0) {
+ if (checkrev(IPL_NAME) == -1) {
+ fprintf(stderr, "User/kernel version check failed\n");
+ exit(1);
+ }
+ }
+
+ if (!(opts & OPT_DONOTHING) && (kernel == NULL) && (core == NULL)) {
+ bzero((char *)&obj, sizeof(obj));
+ obj.ipfo_rev = IPFILTER_VERSION;
+ obj.ipfo_type = IPFOBJ_NATSTAT;
+ obj.ipfo_size = sizeof(*nsp);
+ obj.ipfo_ptr = (void *)nsp;
+ if (ioctl(fd, SIOCGNATS, &obj) == -1) {
+ perror("ioctl(SIOCGNATS)");
+ exit(1);
+ }
+ (void) setgid(getgid());
+ (void) setuid(getuid());
+ } else if ((kernel != NULL) || (core != NULL)) {
+ if (openkmem(kernel, core) == -1)
+ exit(1);
+
+ natstat_dead(nsp, kernel);
+ if (opts & (OPT_LIST|OPT_STAT))
+ dostats(fd, nsp, opts, 0);
+ exit(0);
+ }
+
+ if (opts & (OPT_FLUSH|OPT_CLEAR))
+ flushtable(fd, opts);
+ if (file) {
+ ipnat_parsefile(fd, ipnat_addrule, ioctl, file);
+ }
+ if (opts & (OPT_LIST|OPT_STAT))
+ dostats(fd, nsp, opts, 1);
+ return 0;
+}
+
+
+/*
+ * Read NAT statistic information in using a symbol table and memory file
+ * rather than doing ioctl's.
+ */
+void natstat_dead(nsp, kernel)
+natstat_t *nsp;
+char *kernel;
+{
+ struct nlist nat_nlist[10] = {
+ { "nat_table" }, /* 0 */
+ { "nat_list" },
+ { "maptable" },
+ { "ipf_nattable_sz" },
+ { "ipf_natrules_sz" },
+ { "ipf_rdrrules_sz" }, /* 5 */
+ { "ipf_hostmap_sz" },
+ { "nat_instances" },
+ { "ap_sess_list" },
+ { NULL }
+ };
+ void *tables[2];
+
+ if (nlist(kernel, nat_nlist) == -1) {
+ fprintf(stderr, "nlist error\n");
+ return;
+ }
+
+ /*
+ * Normally the ioctl copies all of these values into the structure
+ * for us, before returning it to userland, so here we must copy each
+ * one in individually.
+ */
+ kmemcpy((char *)&tables, nat_nlist[0].n_value, sizeof(tables));
+ nsp->ns_table[0] = tables[0];
+ nsp->ns_table[1] = tables[1];
+
+ kmemcpy((char *)&nsp->ns_list, nat_nlist[1].n_value,
+ sizeof(nsp->ns_list));
+ kmemcpy((char *)&nsp->ns_maptable, nat_nlist[2].n_value,
+ sizeof(nsp->ns_maptable));
+ kmemcpy((char *)&nsp->ns_nattab_sz, nat_nlist[3].n_value,
+ sizeof(nsp->ns_nattab_sz));
+ kmemcpy((char *)&nsp->ns_rultab_sz, nat_nlist[4].n_value,
+ sizeof(nsp->ns_rultab_sz));
+ kmemcpy((char *)&nsp->ns_rdrtab_sz, nat_nlist[5].n_value,
+ sizeof(nsp->ns_rdrtab_sz));
+ kmemcpy((char *)&nsp->ns_hostmap_sz, nat_nlist[6].n_value,
+ sizeof(nsp->ns_hostmap_sz));
+ kmemcpy((char *)&nsp->ns_instances, nat_nlist[7].n_value,
+ sizeof(nsp->ns_instances));
+ kmemcpy((char *)&nsp->ns_apslist, nat_nlist[8].n_value,
+ sizeof(nsp->ns_apslist));
+}
+
+
+/*
+ * Issue an ioctl to flush either the NAT rules table or the active mapping
+ * table or both.
+ */
+void flushtable(fd, opts)
+int fd, opts;
+{
+ int n = 0;
+
+ if (opts & OPT_FLUSH) {
+ n = 0;
+ if (!(opts & OPT_DONOTHING) && ioctl(fd, SIOCIPFFL, &n) == -1)
+ perror("ioctl(SIOCFLNAT)");
+ else
+ printf("%d entries flushed from NAT table\n", n);
+ }
+
+ if (opts & OPT_CLEAR) {
+ n = 1;
+ if (!(opts & OPT_DONOTHING) && ioctl(fd, SIOCIPFFL, &n) == -1)
+ perror("ioctl(SIOCCNATL)");
+ else
+ printf("%d entries flushed from NAT list\n", n);
+ }
+}
+
+
+/*
+ * Display NAT statistics.
+ */
+void dostats_dead(nsp, opts)
+natstat_t *nsp;
+int opts;
+{
+ nat_t *np, nat;
+ ipnat_t ipn;
+
+ printf("List of active MAP/Redirect filters:\n");
+ while (nsp->ns_list) {
+ if (kmemcpy((char *)&ipn, (long)nsp->ns_list,
+ sizeof(ipn))) {
+ perror("kmemcpy");
+ break;
+ }
+ if (opts & OPT_HITS)
+ printf("%lu ", ipn.in_hits);
+ printnat(&ipn, opts & (OPT_DEBUG|OPT_VERBOSE));
+ nsp->ns_list = ipn.in_next;
+ }
+
+ printf("\nList of active sessions:\n");
+
+ for (np = nsp->ns_instances; np; np = nat.nat_next) {
+ if (kmemcpy((char *)&nat, (long)np, sizeof(nat)))
+ break;
+ printactivenat(&nat, opts, 0, nsp->ns_ticks);
+ if (nat.nat_aps)
+ printaps(nat.nat_aps, opts);
+ }
+
+ if (opts & OPT_VERBOSE)
+ showhostmap_dead(nsp);
+}
+
+
+void dostats(fd, nsp, opts, alive)
+natstat_t *nsp;
+int fd, opts, alive;
+{
+ /*
+ * Show statistics ?
+ */
+ if (opts & OPT_STAT) {
+ printf("mapped\tin\t%lu\tout\t%lu\n",
+ nsp->ns_mapped[0], nsp->ns_mapped[1]);
+ printf("added\t%lu\texpired\t%lu\n",
+ nsp->ns_added, nsp->ns_expire);
+ printf("no memory\t%lu\tbad nat\t%lu\n",
+ nsp->ns_memfail, nsp->ns_badnat);
+ printf("inuse\t%lu\norphans\t%u\nrules\t%lu\n",
+ nsp->ns_inuse, nsp->ns_orphans, nsp->ns_rules);
+ printf("wilds\t%u\n", nsp->ns_wilds);
+ dotable(nsp, fd, alive);
+ if (opts & OPT_VERBOSE)
+ printf("table %p list %p\n",
+ nsp->ns_table, nsp->ns_list);
+ if (alive)
+ showtqtable_live(fd);
+ }
+
+ if (opts & OPT_LIST) {
+ if (alive)
+ dostats_live(fd, nsp, opts);
+ else
+ dostats_dead(nsp, opts);
+ }
+}
+
+
+void dotable(nsp, fd, alive)
+natstat_t *nsp;
+int fd, alive;
+{
+ int sz, i, used, totallen, maxlen, minlen;
+ ipftable_t table;
+ u_long *buckets;
+ ipfobj_t obj;
+
+ sz = sizeof(*buckets) * nsp->ns_nattab_sz;
+ buckets = (u_long *)malloc(sz);
+
+ obj.ipfo_rev = IPFILTER_VERSION;
+ obj.ipfo_type = IPFOBJ_GTABLE;
+ obj.ipfo_size = sizeof(table);
+ obj.ipfo_ptr = &table;
+
+ table.ita_type = IPFTABLE_BUCKETS_NATIN;
+ table.ita_table = buckets;
+
+ if (alive) {
+ if (ioctl(fd, SIOCGTABL, &obj) != 0) {
+ free(buckets);
+ return;
+ }
+ } else {
+ if (kmemcpy((char *)buckets, (u_long)nsp->ns_nattab_sz, sz)) {
+ free(buckets);
+ return;
+ }
+ }
+
+ totallen = 0;
+ maxlen = 0;
+ minlen = nsp->ns_inuse;
+ used = 0;
+
+ for (i = 0; i < nsp->ns_nattab_sz; i++) {
+ if (buckets[i] > maxlen)
+ maxlen = buckets[i];
+ if (buckets[i] < minlen)
+ minlen = buckets[i];
+ if (buckets[i] != 0)
+ used++;
+ totallen += buckets[i];
+ }
+
+ printf("hash efficiency\t%2.2f%%\n",
+ totallen ? ((float)used / totallen) * 100.0 : 0.0);
+ printf("bucket usage\t%2.2f%%\n",
+ ((float)used / nsp->ns_nattab_sz) * 100.0);
+ printf("minimal length\t%d\n", minlen);
+ printf("maximal length\t%d\n", maxlen);
+ printf("average length\t%.3f\n", used ? (float)totallen / used : 0.0);
+}
+
+
+/*
+ * Display NAT statistics.
+ */
+void dostats_live(fd, nsp, opts)
+natstat_t *nsp;
+int fd, opts;
+{
+ ipfgeniter_t iter;
+ ipfobj_t obj;
+ ipnat_t ipn;
+ nat_t nat;
+
+ bzero((char *)&obj, sizeof(obj));
+ obj.ipfo_rev = IPFILTER_VERSION;
+ obj.ipfo_type = IPFOBJ_GENITER;
+ obj.ipfo_size = sizeof(iter);
+ obj.ipfo_ptr = &iter;
+
+ iter.igi_type = IPFGENITER_IPNAT;
+ iter.igi_nitems = 1;
+ iter.igi_data = &ipn;
+
+ /*
+ * Show list of NAT rules and NAT sessions ?
+ */
+ printf("List of active MAP/Redirect filters:\n");
+ while (nsp->ns_list) {
+ if (ioctl(fd, SIOCGENITER, &obj) == -1)
+ break;
+ if (opts & OPT_HITS)
+ printf("%lu ", ipn.in_hits);
+ printnat(&ipn, opts & (OPT_DEBUG|OPT_VERBOSE));
+ nsp->ns_list = ipn.in_next;
+ }
+
+ printf("\nList of active sessions:\n");
+
+ iter.igi_type = IPFGENITER_NAT;
+ iter.igi_nitems = 1;
+ iter.igi_data = &nat;
+
+ while (nsp->ns_instances != NULL) {
+ if (ioctl(fd, SIOCGENITER, &obj) == -1)
+ break;
+ printactivenat(&nat, opts, 1, nsp->ns_ticks);
+ if (nat.nat_aps)
+ printaps(nat.nat_aps, opts);
+ nsp->ns_instances = nat.nat_next;
+ }
+
+ if (opts & OPT_VERBOSE)
+ showhostmap_live(fd, nsp);
+}
+
+
+/*
+ * Display the active host mapping table.
+ */
+void showhostmap_dead(nsp)
+natstat_t *nsp;
+{
+ hostmap_t hm, *hmp, **maptable;
+ u_int hv;
+
+ printf("\nList of active host mappings:\n");
+
+ maptable = (hostmap_t **)malloc(sizeof(hostmap_t *) *
+ nsp->ns_hostmap_sz);
+ if (kmemcpy((char *)maptable, (u_long)nsp->ns_maptable,
+ sizeof(hostmap_t *) * nsp->ns_hostmap_sz)) {
+ perror("kmemcpy (maptable)");
+ return;
+ }
+
+ for (hv = 0; hv < nsp->ns_hostmap_sz; hv++) {
+ hmp = maptable[hv];
+
+ while (hmp) {
+ if (kmemcpy((char *)&hm, (u_long)hmp, sizeof(hm))) {
+ perror("kmemcpy (hostmap)");
+ return;
+ }
+
+ printhostmap(&hm, hv);
+ hmp = hm.hm_next;
+ }
+ }
+ free(maptable);
+}
+
+
+/*
+ * Display the active host mapping table.
+ */
+void showhostmap_live(fd, nsp)
+int fd;
+natstat_t *nsp;
+{
+ ipfgeniter_t iter;
+ hostmap_t hm;
+ ipfobj_t obj;
+
+ bzero((char *)&obj, sizeof(obj));
+ obj.ipfo_rev = IPFILTER_VERSION;
+ obj.ipfo_type = IPFOBJ_GENITER;
+ obj.ipfo_size = sizeof(iter);
+ obj.ipfo_ptr = &iter;
+
+ iter.igi_type = IPFGENITER_HOSTMAP;
+ iter.igi_nitems = 1;
+ iter.igi_data = &hm;
+
+ printf("\nList of active host mappings:\n");
+
+ while (nsp->ns_maplist != NULL) {
+ if (ioctl(fd, SIOCGENITER, &obj) == -1)
+ break;
+ printhostmap(&hm, 0);
+ nsp->ns_maplist = hm.hm_next;
+ }
+}
+
+
+void showtqtable_live(fd)
+int fd;
+{
+ ipftq_t table[IPF_TCP_NSTATES];
+ ipfobj_t obj;
+
+ bzero((char *)&obj, sizeof(obj));
+ obj.ipfo_rev = IPFILTER_VERSION;
+ obj.ipfo_size = sizeof(table);
+ obj.ipfo_ptr = (void *)table;
+ obj.ipfo_type = IPFOBJ_STATETQTAB;
+
+ if (ioctl(fd, SIOCGTQTAB, &obj) == 0) {
+ printtqtable(table);
+ }
+}
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