xref: /openbsd-src/usr.sbin/tcpdump/pf_print_state.c (revision 92bb59a8a81491a73f30855c5fc819f868a56f2c)

/*	$OpenBSD: pf_print_state.c,v 1.14 2018/09/07 07:49:43 kevlo Exp $	*/

/*
 * Copyright (c) 2001 Daniel Hartmeier
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 *    - Redistributions of source code must retain the above copyright
 *      notice, this list of conditions and the following disclaimer.
 *    - Redistributions in binary form must reproduce the above
 *      copyright notice, this list of conditions and the following
 *      disclaimer in the documentation and/or other materials provided
 *      with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 *
 */

#include <sys/types.h>
#include <sys/socket.h>
#include <net/if.h>
#define TCPSTATES
#include <netinet/in.h>
#include <netinet/tcp_fsm.h>
#include <net/pfvar.h>
#include <arpa/inet.h>
#include <netdb.h>

#include <stdio.h>
#include <string.h>
#include <vis.h>

#include "pfctl_parser.h"
#include "pfctl.h"
#include "addrtoname.h"

void	print_name(struct pf_addr *, sa_family_t);

void
print_addr(struct pf_addr_wrap *addr, sa_family_t af, int verbose)
{
	switch (addr->type) {
	case PF_ADDR_DYNIFTL:
		printf("(%s", addr->v.ifname);
		if (addr->iflags & PFI_AFLAG_NETWORK)
			printf(":network");
		if (addr->iflags & PFI_AFLAG_BROADCAST)
			printf(":broadcast");
		if (addr->iflags & PFI_AFLAG_PEER)
			printf(":peer");
		if (addr->iflags & PFI_AFLAG_NOALIAS)
			printf(":0");
		if (verbose) {
			if (addr->p.dyncnt <= 0)
				printf(":*");
			else
				printf(":%d", addr->p.dyncnt);
		}
		printf(")");
		break;
	case PF_ADDR_TABLE:
		if (verbose)
			if (addr->p.tblcnt == -1)
				printf("<%s:*>", addr->v.tblname);
			else
				printf("<%s:%d>", addr->v.tblname,
				    addr->p.tblcnt);
		else
			printf("<%s>", addr->v.tblname);
		return;
	case PF_ADDR_ADDRMASK:
		if (PF_AZERO(&addr->v.a.addr, AF_INET6) &&
		    PF_AZERO(&addr->v.a.mask, AF_INET6))
			printf("any");
		else {
			char buf[48];

			if (inet_ntop(af, &addr->v.a.addr, buf,
			    sizeof(buf)) == NULL)
				printf("?");
			else
				printf("%s", buf);
		}
		break;
	case PF_ADDR_NOROUTE:
		printf("no-route");
		return;
	default:
		printf("?");
		return;
	}
	if (! PF_AZERO(&addr->v.a.mask, af)) {
		int bits = unmask(&addr->v.a.mask);

		if (bits != (af == AF_INET ? 32 : 128))
			printf("/%d", bits);
	}
}

void
print_name(struct pf_addr *addr, sa_family_t af)
{
	char *host;

	switch (af) {
	case AF_INET:
		host = getname((char *)&addr->v4);
		break;
	case AF_INET6:
		host = getname6((char *)&addr->v6);
		break;
	default:
		host = "?";
		break;
	}
	printf("%s", host);
}

void
print_host(struct pf_addr *addr, u_int16_t port, sa_family_t af, u_int16_t rdom,
    const char *proto, int opts)
{
	struct servent	*s = NULL;
	char		ps[6];

	if (rdom)
		printf("(%u) ", ntohs(rdom));

	if (opts & PF_OPT_USEDNS)
		print_name(addr, af);
	else {
		struct pf_addr_wrap aw;

		memset(&aw, 0, sizeof(aw));
		aw.v.a.addr = *addr;
		if (af == AF_INET)
			aw.v.a.mask.addr32[0] = 0xffffffff;
		else {
			memset(&aw.v.a.mask, 0xff, sizeof(aw.v.a.mask));
			af = AF_INET6;
		}
		print_addr(&aw, af, opts & PF_OPT_VERBOSE2);
	}

	if (port) {
		snprintf(ps, sizeof(ps), "%u", ntohs(port));
		if (opts & PF_OPT_PORTNAMES)
			s = getservbyport(port, proto);
		if (af == AF_INET)
			printf(":%s", s ? s->s_name : ps);
		else
			printf("[%s]", s ? s->s_name : ps);
	}
}

void
print_seq(struct pfsync_state_peer *p)
{
	if (p->seqdiff)
		printf("[%u + %u](+%u)", ntohl(p->seqlo),
		    ntohl(p->seqhi) - ntohl(p->seqlo), ntohl(p->seqdiff));
	else
		printf("[%u + %u]", ntohl(p->seqlo),
		    ntohl(p->seqhi) - ntohl(p->seqlo));
}

void
print_state(struct pfsync_state *s, int opts)
{
	struct pfsync_state_peer *src, *dst;
	struct pfsync_state_key *sk, *nk;
	char ifname[IFNAMSIZ * 4 + 1];
	int min, sec, sidx, didx, i;
	char *cp = ifname;

	if (s->direction == PF_OUT) {
		src = &s->src;
		dst = &s->dst;
		sk = &s->key[PF_SK_STACK];
		nk = &s->key[PF_SK_WIRE];
		if (s->proto == IPPROTO_ICMP || s->proto == IPPROTO_ICMPV6)
			sk->port[0] = nk->port[0];
	} else {
		src = &s->dst;
		dst = &s->src;
		sk = &s->key[PF_SK_WIRE];
		nk = &s->key[PF_SK_STACK];
		if (s->proto == IPPROTO_ICMP || s->proto == IPPROTO_ICMPV6)
			sk->port[1] = nk->port[1];
	}
	/* Treat s->ifname as untrusted input. */
	for (i = 0; i < IFNAMSIZ && s->ifname[i] != '\0'; i++)
		cp = vis(cp, s->ifname[i], VIS_WHITE, 0);
	printf("%s ", ifname);
	printf("%s ", ipproto_string(s->proto));

	if (nk->af != sk->af)
		sidx = 1, didx = 0;
	else
		sidx = 0, didx = 1;

	print_host(&nk->addr[didx], nk->port[didx], nk->af, nk->rdomain, NULL, opts);
	if (nk->af != sk->af || PF_ANEQ(&nk->addr[1], &sk->addr[1], nk->af) ||
	    nk->port[1] != sk->port[1]) {
		printf(" (");
		print_host(&sk->addr[1], sk->port[1], sk->af, sk->rdomain,
		    NULL, opts);
		printf(")");
	}
	if (s->direction == PF_OUT)
		printf(" -> ");
	else
		printf(" <- ");
	print_host(&nk->addr[sidx], nk->port[sidx], nk->af, nk->rdomain, NULL,
	    opts);
	if (nk->af != sk->af || PF_ANEQ(&nk->addr[0], &sk->addr[0], nk->af) ||
	    nk->port[0] != sk->port[0]) {
		printf(" (");
		print_host(&sk->addr[0], sk->port[0], sk->af, sk->rdomain, NULL,
		    opts);
		printf(")");
	}

	printf("    ");
	if (s->proto == IPPROTO_TCP) {
		if (src->state <= TCPS_TIME_WAIT &&
		    dst->state <= TCPS_TIME_WAIT)
			printf("\n   %s:%s", tcpstates[src->state],
			    tcpstates[dst->state]);
		else if (src->state == PF_TCPS_PROXY_SRC ||
		    dst->state == PF_TCPS_PROXY_SRC)
			printf("\n   PROXY:SRC");
		else if (src->state == PF_TCPS_PROXY_DST ||
		    dst->state == PF_TCPS_PROXY_DST)
			printf("\n   PROXY:DST");
		else
			printf("\n   <BAD STATE LEVELS %u:%u>",
			    src->state, dst->state);
		if (opts & PF_OPT_VERBOSE) {
			printf("\n   ");
			print_seq(src);
			if (src->wscale && dst->wscale)
				printf(" wscale %u",
				    src->wscale & PF_WSCALE_MASK);
			printf("  ");
			print_seq(dst);
			if (src->wscale && dst->wscale)
				printf(" wscale %u",
				    dst->wscale & PF_WSCALE_MASK);
		}
	} else if (s->proto == IPPROTO_UDP && src->state < PFUDPS_NSTATES &&
	    dst->state < PFUDPS_NSTATES) {
		const char *states[] = PFUDPS_NAMES;

		printf("   %s:%s", states[src->state], states[dst->state]);
	} else if (s->proto != IPPROTO_ICMP && src->state < PFOTHERS_NSTATES &&
	    dst->state < PFOTHERS_NSTATES) {
		/* XXX ICMP doesn't really have state levels */
		const char *states[] = PFOTHERS_NAMES;

		printf("   %s:%s", states[src->state], states[dst->state]);
	} else {
		printf("   %u:%u", src->state, dst->state);
	}

	if (opts & PF_OPT_VERBOSE) {
		u_int64_t packets[2];
		u_int64_t bytes[2];
		u_int32_t creation = ntohl(s->creation);
		u_int32_t expire = ntohl(s->expire);

		sec = creation % 60;
		creation /= 60;
		min = creation % 60;
		creation /= 60;
		printf("\n   age %.2u:%.2u:%.2u", creation, min, sec);
		sec = expire % 60;
		expire /= 60;
		min = expire % 60;
		expire /= 60;
		printf(", expires in %.2u:%.2u:%.2u", expire, min, sec);

		bcopy(s->packets[0], &packets[0], sizeof(u_int64_t));
		bcopy(s->packets[1], &packets[1], sizeof(u_int64_t));
		bcopy(s->bytes[0], &bytes[0], sizeof(u_int64_t));
		bcopy(s->bytes[1], &bytes[1], sizeof(u_int64_t));
		printf(", %llu:%llu pkts, %llu:%llu bytes",
		    betoh64(packets[0]),
		    betoh64(packets[1]),
		    betoh64(bytes[0]),
		    betoh64(bytes[1]));
		if (s->anchor != -1)
			printf(", anchor %u", ntohl(s->anchor));
		if (s->rule != -1)
			printf(", rule %u", ntohl(s->rule));
	}
	if (opts & PF_OPT_VERBOSE2) {
		u_int64_t id;

		bcopy(&s->id, &id, sizeof(u_int64_t));
		printf("\n   id: %016llx creatorid: %08x",
		    betoh64(id), ntohl(s->creatorid));
	}
}

int
unmask(struct pf_addr *m)
{
	int i = 31, j = 0, b = 0;
	u_int32_t tmp;

	while (j < 4 && m->addr32[j] == 0xffffffff) {
		b += 32;
		j++;
	}
	if (j < 4) {
		tmp = ntohl(m->addr32[j]);
		for (i = 31; tmp & (1 << i); --i)
			b++;
	}
	return (b);
}