/*      $NetBSD: netcmds.c,v 1.24 2022/10/28 05:27:17 ozaki-r 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.
 */

#include <sys/cdefs.h>
#ifndef lint
#if 0
static char sccsid[] = "@(#)netcmds.c   8.1 (Berkeley) 6/6/93";
#endif
__RCSID("$NetBSD: netcmds.c,v 1.24 2022/10/28 05:27:17 ozaki-r Exp $");
#endif /* not lint */

/*
 * Common network command support routines.
 */
#include <sys/param.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>
#ifdef INET6
#include <netinet/ip6.h>
#include <netinet6/in6_pcb.h>
#endif

#include <arpa/inet.h>

#include <ctype.h>
#include <netdb.h>
#include <stdlib.h>
#include <string.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 = NULL;

int nports, nhosts, protos;

static void changeitems(char *, int);
static void selectproto(const 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);

/* please note: there are also some netstat commands in netstat.c */

void
netstat_display(char *args)
{
        changeitems(args, 1);
}

void
netstat_ignore(char *args)
{
        changeitems(args, 0);
}

void
netstat_reset(char *args)
{
        selectproto(0);
        selecthost(0, 0);
        selectport(-1, 0);
}

void
netstat_show(char *args)
{
        move(CMDLINE, 0); clrtoeol();
        if (!args || *args == '\0') {
                showprotos();
                showhosts();
                showports();
                return;
        }
        if (strstr(args, "protos") == args)
                showprotos();
        else if (strstr(args, "hosts") == args)
                showhosts();
        else if (strstr(args, "ports") == args)
                showports();
        else
                addstr("show what?");
}

void
netstat_tcp(char *args)
{
        selectproto("tcp");
}

void
netstat_udp(char *args)
{
        selectproto("udp");
}

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

        cp = strchr(args, '\n');
        if (cp)
                *cp = '\0';
        for (;;args = cp) {
                for (cp = args; *cp && isspace((unsigned char)*cp); cp++)
                        ;
                args = cp;
                for (; *cp && !isspace((unsigned char)*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 void
selectproto(const char *proto)
{

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

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 = NULL;

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

        if (port == -1) {
                if (ports == NULL)
                        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 (reallocarr(&ports, nports + 1, sizeof(*p)) != 0) {
                error("malloc failed");
                die(0);
        }
        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("%ld ", 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;
#ifdef INET6
        case AF_INET6:
                if (IN6_ARE_ADDR_EQUAL(&((struct sockaddr_in6 *)sa1)->sin6_addr,
                                &((struct sockaddr_in6 *)sa2)->sin6_addr))
                        return 1;
                break;
#endif
        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((char *)hosts), hosts = 0;
                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 (reallocarr(&hosts, nhosts + 1, sizeof(*p)) != 0) {
                error("malloc failed");
                die(0);
        }
        p = &hosts[nhosts++];
        memcpy(&p->addr, sa, sa->sa_len);
        p->onoff = onoff;
        return (1);
}

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

        if (hosts)
                for (p = hosts; p < hosts+nhosts; p++) {
                        if (((struct sockaddr *)&p->addr)->sa_family != AF_INET)
                                continue;
                        s_in = (struct sockaddr_in *)&p->addr;
                        if (s_in->sin_addr.s_addr == in4p_laddr(inp).s_addr ||
                            s_in->sin_addr.s_addr == in4p_faddr(inp).s_addr)
                                return (p->onoff);
                }
        return (1);
}

#ifdef INET6
int
checkhost6(struct inpcb *inp)
{
        struct hitem *p;
        struct sockaddr_in6 *sin6;

        if (hosts)
                for (p = hosts; p < hosts+nhosts; p++) {
                        if (((struct sockaddr *)&p->addr)->sa_family != AF_INET6)
                                continue;
                        sin6 = (struct sockaddr_in6 *)&p->addr;
                        if (IN6_ARE_ADDR_EQUAL(&sin6->sin6_addr, &in6p_laddr(inp)) ||
                            IN6_ARE_ADDR_EQUAL(&sin6->sin6_addr, &in6p_faddr(inp)))
                                return (p->onoff);
                }
        return (1);
}
#endif

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

#if 0
        flags = nflag ? NI_NUMERICHOST : 0;
#else
        flags = 0;
#endif
        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);
        }
}