/*	$OpenBSD: netcmds.c,v 1.16 2006/03/31 04:10:59 deraadt Exp $	*/
/*	$NetBSD: netcmds.c,v 1.4 1995/05/21 17:14:38 mycroft Exp $	*/

/*-
 * Copyright (c) 1980, 1992, 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. 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.
 * 3. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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.
 */

#ifndef lint
#if 0
static char sccsid[] = "@(#)netcmds.c	8.1 (Berkeley) 6/6/93";
#endif
static char rcsid[] = "$OpenBSD: netcmds.c,v 1.16 2006/03/31 04:10:59 deraadt Exp $";
#endif /* not lint */

/*
 * Common network command support routines.
 */
#include <sys/param.h>
#include <sys/socket.h>
#include <sys/socketvar.h>
#include <sys/mbuf.h>
#include <sys/protosw.h>

#include <net/route.h>
#include <netinet/in.h>
#include <netinet/in_systm.h>
#include <netinet/ip.h>
#include <netinet/in_pcb.h>

#include <arpa/inet.h>

#include <netdb.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include "systat.h"
#include "extern.h"

#define	streq(a,b)	(strcmp(a,b)==0)

static	struct hitem {
	struct sockaddr_storage addr;
	int	onoff;
} *hosts;

int nports, nhosts, protos;

static void changeitems(char *, int);
static int selectproto(char *);
static void showprotos(void);
static int selectport(long, int);
static void showports(void);
static int addrcmp(struct sockaddr *, struct sockaddr *);
static int selecthost(struct sockaddr *, int);
static void showhosts(void);

int
netcmd(char *cmd, char *args)
{

	if (prefix(cmd, "tcp") || prefix(cmd, "udp")) {
		selectproto(cmd);
		return (1);
	}
	if (prefix(cmd, "ignore") || prefix(cmd, "display")) {
		changeitems(args, prefix(cmd, "display"));
		return (1);
	}
	if (prefix(cmd, "reset")) {
		selectproto(0);
		selecthost(0, 0);
		selectport(htons(-1), 0);
		return (1);
	}
	if (prefix(cmd, "show")) {
		move(CMDLINE, 0);
		clrtoeol();
		if (*args == '\0') {
			showprotos();
			showhosts();
			showports();
			return (1);
		}
		if (prefix(args, "protos"))
			showprotos();
		else if (prefix(args, "hosts"))
			showhosts();
		else if (prefix(args, "ports"))
			showports();
		else
			addstr("show what?");
		return (1);
	}
	return (0);
}


static void
changeitems(char *args, int onoff)
{
	char *cp;
	struct servent *sp;
	struct addrinfo hints, *res0, *res;

	cp = strchr(args, '\n');
	if (cp)
		*cp = '\0';
	for (;;args = cp) {
		for (cp = args; *cp && isspace(*cp); cp++)
			;
		args = cp;
		for (; *cp && !isspace(*cp); cp++)
			;
		if (*cp)
			*cp++ = '\0';
		if (cp - args == 0)
			break;
		sp = getservbyname(args,
		    protos == TCP ? "tcp" : protos == UDP ? "udp" : 0);
		if (sp) {
			selectport(sp->s_port, onoff);
			continue;
		}

		memset(&hints, 0, sizeof(hints));
		hints.ai_family = PF_UNSPEC;
		hints.ai_socktype = SOCK_DGRAM;
		if (getaddrinfo(args, "0", &hints, &res0) != 0) {
			error("%s: unknown host or port", args);
			continue;
		}
		for (res = res0; res; res = res->ai_next)
			selecthost(res->ai_addr, onoff);
		freeaddrinfo(res0);
	}
}

static int
selectproto(char *proto)
{
	int new = protos;

	if (proto == 0 || streq(proto, "all"))
		new = TCP|UDP;
	else if (streq(proto, "tcp"))
		new = TCP;
	else if (streq(proto, "udp"))
		new = UDP;
	return (protos = new);
}

static void
showprotos(void)
{

	if ((protos&TCP) == 0)
		addch('!');
	addstr("tcp ");
	if ((protos&UDP) == 0)
		addch('!');
	addstr("udp ");
}

static	struct pitem {
	long	port;
	int	onoff;
} *ports;

static int
selectport(long port, int onoff)
{
	struct pitem *p;

	if (ntohs(port) == -1) {
		if (ports == 0)
			return (0);
		free(ports);
		ports = NULL;
		nports = 0;
		return (1);
	}
	for (p = ports; p < ports+nports; p++)
		if (p->port == port) {
			p->onoff = onoff;
			return (0);
		}
	if (nports == 0)
		ports = (struct pitem *)malloc(sizeof (*p));
	else
		ports = (struct pitem *)realloc(ports, (nports+1)*sizeof (*p));
	p = &ports[nports++];
	p->port = port;
	p->onoff = onoff;
	return (1);
}

int
checkport(struct inpcb *inp)
{
	struct pitem *p;

	if (ports)
	for (p = ports; p < ports+nports; p++)
		if (p->port == inp->inp_lport || p->port == inp->inp_fport)
			return (p->onoff);
	return (1);
}

static void
showports(void)
{
	struct pitem *p;
	struct servent *sp;

	for (p = ports; p < ports+nports; p++) {
		sp = getservbyport(p->port,
		    protos == (TCP|UDP) ? 0 : protos == TCP ? "tcp" : "udp");
		if (!p->onoff)
			addch('!');
		if (sp)
			printw("%s ", sp->s_name);
		else
			printw("%d ", ntohs(p->port));
	}
}

static int
addrcmp(struct sockaddr *sa1, struct sockaddr *sa2)
{
	if (sa1->sa_family != sa2->sa_family)
		return 0;
	if (sa1->sa_len != sa2->sa_len)
		return 0;
	switch (sa1->sa_family) {
	case AF_INET:
		if (((struct sockaddr_in *)sa1)->sin_addr.s_addr ==
		    ((struct sockaddr_in *)sa2)->sin_addr.s_addr)
			return 1;
		break;
	case AF_INET6:
		if (IN6_ARE_ADDR_EQUAL(&((struct sockaddr_in6 *)sa1)->sin6_addr,
		    &((struct sockaddr_in6 *)sa2)->sin6_addr))
			return 1;
		break;
	default:
		if (memcmp(sa1, sa2, sa1->sa_len) == 0)
			return 1;
		break;
	}
	return 0;
}

static int
selecthost(struct sockaddr *sa, int onoff)
{
	struct hitem *p;

	if (sa == 0) {
		if (hosts == 0)
			return (0);
		free(hosts);
		hosts = NULL;
		nhosts = 0;
		return (1);
	}
	for (p = hosts; p < hosts+nhosts; p++)
		if (addrcmp((struct sockaddr *)&p->addr, sa)) {
			p->onoff = onoff;
			return (0);
		}
	if (sa->sa_len > sizeof(struct sockaddr_storage))
		return (-1);	/*XXX*/
	if (nhosts == 0)
		hosts = (struct hitem *)malloc(sizeof (*p));
	else
		hosts = (struct hitem *)realloc(hosts, (nhosts+1)*sizeof (*p));
	p = &hosts[nhosts++];
	memcpy(&p->addr, sa, sa->sa_len);
	p->onoff = onoff;
	return (1);
}

int
checkhost(struct inpcb *inp)
{
	struct hitem *p;

	if (hosts)
	for (p = hosts; p < hosts+nhosts; p++) {
		if (((struct sockaddr *)&p->addr)->sa_family == AF_INET &&
		    !(inp->inp_flags & INP_IPV6)) {
			struct sockaddr_in *sin;
			sin = (struct sockaddr_in *)&p->addr;
			if (sin->sin_addr.s_addr == inp->inp_laddr.s_addr ||
			    sin->sin_addr.s_addr == inp->inp_faddr.s_addr)
				return (p->onoff);
		}
		if (((struct sockaddr *)&p->addr)->sa_family == AF_INET6 &&
		    (inp->inp_flags & INP_IPV6)) {
			struct sockaddr_in6 *sin6;
			sin6 = (struct sockaddr_in6 *)&p->addr;
			if (IN6_ARE_ADDR_EQUAL(&sin6->sin6_addr, &inp->inp_laddr6) ||
			    IN6_ARE_ADDR_EQUAL(&sin6->sin6_addr, &inp->inp_faddr6))
				return (p->onoff);
		}
	}
	return (1);
}

static void
showhosts(void)
{
	struct hitem *p;
	char hbuf[NI_MAXHOST];
	struct sockaddr *sa;
	int flags;

	flags = nflag ? NI_NUMERICHOST : 0;
	for (p = hosts; p < hosts+nhosts; p++) {
		sa = (struct sockaddr *)&p->addr;
		if (getnameinfo(sa, sa->sa_len, hbuf, sizeof(hbuf), NULL, 0,
		    flags) != 0)
			strlcpy(hbuf, "(invalid)", sizeof hbuf);
		if (!p->onoff)
			addch('!');
		printw("%s ", hbuf);
	}
}