usr/src/usr.bin/netstat/route.c

/*
 * Copyright (c) 1983, 1988 Regents of the University of California.
 * All rights reserved.
 *
 * %sccs.include.redist.c%
 */

#ifndef lint
static char sccsid[] = "@(#)route.c     5.18 (Berkeley) %G%";
#endif /* not lint */

#include <sys/param.h>
#include <sys/socket.h>
#include <sys/mbuf.h>

#include <net/if.h>
#define  KERNEL
#include <net/route.h>
#undef KERNEL
#include <netinet/in.h>

#include <netns/ns.h>

#include <netdb.h>
#include <sys/kinfo.h>

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

extern  int kmem;
extern  int nflag;
extern  char *routename(), *netname(), *ns_print(), *plural();
extern  char *malloc();
#define kget(p, d) \
        (klseek(kmem, (off_t)(p), 0), read(kmem, (char *)&(d), sizeof (d)))

/*
 * Definitions for showing gateway flags.
 */
struct bits {
        short   b_mask;
        char    b_val;
} bits[] = {
        { RTF_UP,       'U' },
        { RTF_GATEWAY,  'G' },
        { RTF_HOST,     'H' },
        { RTF_DYNAMIC,  'D' },
        { RTF_MODIFIED, 'M' },
        { RTF_CLONING,  'C' },
        { RTF_XRESOLVE, 'R' },
        { RTF_LLINFO,   'L' },
        { 0 }
};

/*
 * Print routing tables.
 */
routepr(hostaddr, netaddr, hashsizeaddr, treeaddr)
        off_t hostaddr, netaddr, hashsizeaddr, treeaddr;
{
        struct mbuf mb;
        register struct ortentry *rt;
        register struct mbuf *m;
        char name[16], *flags;
        struct mbuf **routehash;
        int hashsize;
        int i, doinghost = 1;

        printf("Routing tables\n");
        printf("%-16.16s %-18.18s %-6.6s  %6.6s%8.8s  %s\n",
                "Destination", "Gateway",
                "Flags", "Refs", "Use", "Interface");
        if (treeaddr)
                return treestuff(treeaddr);
        if (hostaddr == 0) {
                printf("rthost: symbol not in namelist\n");
                return;
        }
        if (netaddr == 0) {
                printf("rtnet: symbol not in namelist\n");
                return;
        }
        if (hashsizeaddr == 0) {
                printf("rthashsize: symbol not in namelist\n");
                return;
        }
        kget(hashsizeaddr, hashsize);
        routehash = (struct mbuf **)malloc( hashsize*sizeof (struct mbuf *) );
        klseek(kmem, hostaddr, 0);
        read(kmem, (char *)routehash, hashsize*sizeof (struct mbuf *));
again:
        for (i = 0; i < hashsize; i++) {
                if (routehash[i] == 0)
                        continue;
                m = routehash[i];
                while (m) {
                        kget(m, mb);
                        p_rtentry((struct rtentry *)(mb.m_dat));
                        m = mb.m_next;
                }
        }
        if (doinghost) {
                klseek(kmem, netaddr, 0);
                read(kmem, (char *)routehash, hashsize*sizeof (struct mbuf *));
                doinghost = 0;
                goto again;
        }
        free((char *)routehash);
        return;
}

static union {
        struct  sockaddr u_sa;
        u_short u_data[128];
} pt_u;
static struct rtentry rtentry;

int NewTree = 0;
treestuff(rtree)
off_t rtree;
{
        struct radix_node_head *rnh, head;

        if (NewTree)
                return(ntreestuff());
        for (kget(rtree, rnh); rnh; rnh = head.rnh_next) {
                kget(rnh, head);
                if (head.rnh_af == 0) {
                        printf("Netmasks:\n");
                        p_tree(head.rnh_treetop, 0);
                } else {
                        printf("\nRoute Tree for Protocol Family %d:\n",
                                                                head.rnh_af);
                        p_tree(head.rnh_treetop, 1);
                }
        }
}

struct sockaddr *
kgetsa(dst)
register struct sockaddr *dst;
{
        kget(dst, pt_u.u_sa);
        if (pt_u.u_sa.sa_len > sizeof (pt_u.u_sa)) {
                klseek(kmem, (off_t)dst, 0);
                read(kmem, pt_u.u_data, pt_u.u_sa.sa_len);
        }
        return (&pt_u.u_sa);
}

p_tree(rn, do_rtent)
struct radix_node *rn;
{
        struct radix_node rnode;
        register u_short *s, *slim;
        int len;

again:
        kget(rn, rnode);
        if (rnode.rn_b < 0) {
                if (rnode.rn_flags & RNF_ROOT)
                        printf("(root node)\n");
                else if (do_rtent) {
                        kget(rn, rtentry);
                        p_rtentry(&rtentry);
                } else {
                        p_sockaddr(kgetsa((struct sockaddr *)rnode.rn_key),
                                    0, 44);
                        putchar('\n');
                }
                if (rn = rnode.rn_dupedkey)
                        goto again;
        } else {
                p_tree(rnode.rn_l, do_rtent);
                p_tree(rnode.rn_r, do_rtent);
        }
}

ntreestuff()
{
        int needed;
        char *buf, *next, *lim;
        register struct rt_msghdr *rtm;

        if ((needed = getkerninfo(KINFO_RT_DUMP, 0, 0, 0)) < 0)
                { perror("route-getkerninfo-estimate"); exit(1);}
        if ((buf = malloc(needed)) == 0)
                { printf("out of space\n"); exit(1);}
        if (getkerninfo(KINFO_RT_DUMP, buf, &needed, 0) < 0)
                { perror("actual retrieval of routing table"); exit(1);}
        lim  = buf + needed;
        for (next = buf; next < lim; next += rtm->rtm_msglen) {
                rtm = (struct rt_msghdr *)next;
                np_rtentry(rtm);
        }
}

np_rtentry(rtm)
register struct rt_msghdr *rtm;
{
        register struct sockaddr *sa = (struct sockaddr *)(rtm + 1);
        static int masks_done, old_af, banner_printed;
        int af = 0, interesting = RTF_UP | RTF_GATEWAY | RTF_HOST;

#ifdef notdef
        /* for the moment, netmasks are skipped over */
        if (!banner_printed) {
                printf("Netmasks:\n");
                banner_printed = 1;
        }
        if (masks_done == 0) {
                if (rtm->rtm_addrs != RTA_DST ) {
                        masks_done = 1;
                        af = sa->sa_family;
                }
        } else
#endif
                af = sa->sa_family;
        if (af != old_af) {
                printf("\nRoute Tree for Protocol Family %d:\n", af);
                old_af = af;
        }
        if (rtm->rtm_addrs == RTA_DST)
                p_sockaddr(sa, 0, 36);
        else {
                p_sockaddr(sa, rtm->rtm_flags, 16);
                if (sa->sa_len == 0)
                        sa->sa_len = sizeof(long);
                sa = (struct sockaddr *)(sa->sa_len + (char *)sa);
                p_sockaddr(sa, 0, 18);
        }
        p_flags(rtm->rtm_flags & interesting, "%-6.6s ");
        putchar('\n');
}

p_sockaddr(sa, flags, width)
struct sockaddr *sa;
int flags, width;
{
        char format[20], workbuf[128], *cp, *cplim;
        register char *cpout;

        switch(sa->sa_family) {
        case AF_INET:
            {
                register struct sockaddr_in *sin = (struct sockaddr_in *)sa;

                cp = (sin->sin_addr.s_addr == 0) ? "default" :
                      ((flags & RTF_HOST) ?
                        routename(sin->sin_addr) : netname(sin->sin_addr, 0L));
            }
                break;

        case AF_NS:
                cp = ns_print((struct sockaddr_ns *)sa);
                break;

        default:
            {
                register u_short *s = ((u_short *)sa->sa_data),
                                *slim = ((sa->sa_len + 1)/2) + s;

                cp = workbuf;
                cplim = cp + sizeof(workbuf) - 6;
                cp += sprintf(cp, "(%d)", sa->sa_family);
                while (s < slim && cp < cplim)
                        cp += sprintf(cp, "%x ", *s++);
                cp = workbuf;
            }
        }
        if (nflag)
                printf("%-*s ", width, cp);
        else
                printf("%-*.*s ", width, width, cp);
}

p_flags(f, format)
register int f;
char *format;
{
        char name[33], *flags;
        register struct bits *p = bits;
        for (flags = name; p->b_mask; p++)
                if (p->b_mask & f)
                        *flags++ = p->b_val;
        *flags = '\0';
        printf(format, name);
}

p_rtentry(rt)
register struct rtentry *rt;
{
        char name[16];
        register struct sockaddr *sa;
        struct ifnet ifnet;

        p_sockaddr(kgetsa(rt_key(rt)), rt->rt_flags, 16);
        p_sockaddr(kgetsa(rt->rt_gateway), 0, 18);
        p_flags(rt->rt_flags, "%-6.6s ");
        printf("%6d %8d ", rt->rt_refcnt, rt->rt_use);
        if (rt->rt_ifp == 0) {
                putchar('\n');
                return;
        }
        kget(rt->rt_ifp, ifnet);
        klseek(kmem, (off_t)ifnet.if_name, 0);
        read(kmem, name, 16);
        printf(" %.15s%d\n", name, ifnet.if_unit);
}

p_ortentry(rt)
register struct ortentry *rt;
{
        char name[16], *flags;
        register struct bits *p;
        register struct sockaddr_in *sin;
        struct ifnet ifnet;

        p_sockaddr(&rt->rt_dst, rt->rt_flags, 16);
        p_sockaddr(&rt->rt_gateway, 0, 18);
        p_flags(rt->rt_flags, "%-6.6s ");
        printf("%6d %8d ", rt->rt_refcnt, rt->rt_use);
        if (rt->rt_ifp == 0) {
                putchar('\n');
                return;
        }
        kget(rt->rt_ifp, ifnet);
        klseek(kmem, (off_t)ifnet.if_name, 0);
        read(kmem, name, 16);
        printf(" %.15s%d\n", name, ifnet.if_unit);
}

char *
routename(in)
        struct in_addr in;
{
        register char *cp;
        static char line[MAXHOSTNAMELEN + 1];
        struct hostent *hp;
        static char domain[MAXHOSTNAMELEN + 1];
        static int first = 1;
        char *index();

        if (first) {
                first = 0;
                if (gethostname(domain, MAXHOSTNAMELEN) == 0 &&
                    (cp = index(domain, '.')))
                        (void) strcpy(domain, cp + 1);
                else
                        domain[0] = 0;
        }
        cp = 0;
        if (!nflag) {
                hp = gethostbyaddr((char *)&in, sizeof (struct in_addr),
                        AF_INET);
                if (hp) {
                        if ((cp = index(hp->h_name, '.')) &&
                            !strcmp(cp + 1, domain))
                                *cp = 0;
                        cp = hp->h_name;
                }
        }
        if (cp)
                strncpy(line, cp, sizeof(line) - 1);
        else {
#define C(x)    ((x) & 0xff)
                in.s_addr = ntohl(in.s_addr);
                sprintf(line, "%u.%u.%u.%u", C(in.s_addr >> 24),
                        C(in.s_addr >> 16), C(in.s_addr >> 8), C(in.s_addr));
        }
        return (line);
}

/*
 * Return the name of the network whose address is given.
 * The address is assumed to be that of a net or subnet, not a host.
 */
char *
netname(in, mask)
        struct in_addr in;
        u_long mask;
{
        char *cp = 0;
        static char line[MAXHOSTNAMELEN + 1];
        struct netent *np = 0;
        u_long net;
        register i;
        int subnetshift;

        i = ntohl(in.s_addr);
        if (!nflag && i) {
                if (mask == 0) {
                        if (IN_CLASSA(i)) {
                                mask = IN_CLASSA_NET;
                                subnetshift = 8;
                        } else if (IN_CLASSB(i)) {
                                mask = IN_CLASSB_NET;
                                subnetshift = 8;
                        } else {
                                mask = IN_CLASSC_NET;
                                subnetshift = 4;
                        }
                        /*
                         * If there are more bits than the standard mask
                         * would suggest, subnets must be in use.
                         * Guess at the subnet mask, assuming reasonable
                         * width subnet fields.
                         */
                        while (i &~ mask)
                                mask = (long)mask >> subnetshift;
                }
                net = i & mask;
                while ((mask & 1) == 0)
                        mask >>= 1, net >>= 1;
                np = getnetbyaddr(net, AF_INET);
                if (np)
                        cp = np->n_name;
        }
        if (cp)
                strncpy(line, cp, sizeof(line) - 1);
        else if ((i & 0xffffff) == 0)
                sprintf(line, "%u", C(i >> 24));
        else if ((i & 0xffff) == 0)
                sprintf(line, "%u.%u", C(i >> 24) , C(i >> 16));
        else if ((i & 0xff) == 0)
                sprintf(line, "%u.%u.%u", C(i >> 24), C(i >> 16), C(i >> 8));
        else
                sprintf(line, "%u.%u.%u.%u", C(i >> 24),
                        C(i >> 16), C(i >> 8), C(i));
        return (line);
}

/*
 * Print routing statistics
 */
rt_stats(off)
        off_t off;
{
        struct rtstat rtstat;

        if (off == 0) {
                printf("rtstat: symbol not in namelist\n");
                return;
        }
        klseek(kmem, off, 0);
        read(kmem, (char *)&rtstat, sizeof (rtstat));
        printf("routing:\n");
        printf("\t%u bad routing redirect%s\n",
                rtstat.rts_badredirect, plural(rtstat.rts_badredirect));
        printf("\t%u dynamically created route%s\n",
                rtstat.rts_dynamic, plural(rtstat.rts_dynamic));
        printf("\t%u new gateway%s due to redirects\n",
                rtstat.rts_newgateway, plural(rtstat.rts_newgateway));
        printf("\t%u destination%s found unreachable\n",
                rtstat.rts_unreach, plural(rtstat.rts_unreach));
        printf("\t%u use%s of a wildcard route\n",
                rtstat.rts_wildcard, plural(rtstat.rts_wildcard));
}
short ns_nullh[] = {0,0,0};
short ns_bh[] = {-1,-1,-1};

char *
ns_print(sns)
struct sockaddr_ns *sns;
{
        struct ns_addr work;
        union { union ns_net net_e; u_long long_e; } net;
        u_short port;
        static char mybuf[50], cport[10], chost[25];
        char *host = "";
        register char *p; register u_char *q;

        work = sns->sns_addr;
        port = ntohs(work.x_port);
        work.x_port = 0;
        net.net_e  = work.x_net;
        if (ns_nullhost(work) && net.long_e == 0) {
                if (port ) {
                        sprintf(mybuf, "*.%xH", port);
                        upHex(mybuf);
                } else
                        sprintf(mybuf, "*.*");
                return (mybuf);
        }

        if (bcmp(ns_bh, work.x_host.c_host, 6) == 0) {
                host = "any";
        } else if (bcmp(ns_nullh, work.x_host.c_host, 6) == 0) {
                host = "*";
        } else {
                q = work.x_host.c_host;
                sprintf(chost, "%02x%02x%02x%02x%02x%02xH",
                        q[0], q[1], q[2], q[3], q[4], q[5]);
                for (p = chost; *p == '0' && p < chost + 12; p++);
                host = p;
        }
        if (port)
                sprintf(cport, ".%xH", htons(port));
        else
                *cport = 0;

        sprintf(mybuf,"%xH.%s%s", ntohl(net.long_e), host, cport);
        upHex(mybuf);
        return(mybuf);
}

char *
ns_phost(sns)
struct sockaddr_ns *sns;
{
        struct sockaddr_ns work;
        static union ns_net ns_zeronet;
        char *p;

        work = *sns;
        work.sns_addr.x_port = 0;
        work.sns_addr.x_net = ns_zeronet;

        p = ns_print(&work);
        if (strncmp("0H.", p, 3) == 0) p += 3;
        return(p);
}
upHex(p0)
char *p0;
{
        register char *p = p0;
        for (; *p; p++) switch (*p) {

        case 'a': case 'b': case 'c': case 'd': case 'e': case 'f':
                *p += ('A' - 'a');
        }
}