/*      $OpenBSD: show.c,v 1.123 2025/07/10 07:55:44 dlg Exp $  */
/*      $NetBSD: show.c,v 1.1 1996/11/15 18:01:41 gwr Exp $     */

/*
 * Copyright (c) 1983, 1988, 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/socket.h>
#include <sys/sysctl.h>

#include <net/if.h>
#include <net/if_dl.h>
#include <net/if_types.h>
#include <net/route.h>
#include <netinet/in.h>
#include <netinet/if_ether.h>
#include <netmpls/mpls.h>
#include <arpa/inet.h>

#include <err.h>
#include <errno.h>
#include <netdb.h>
#include <stdio.h>
#include <stddef.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <limits.h>

#include "show.h"

char    *any_ntoa(const struct sockaddr *);
char    *link_print(struct sockaddr *);
char    *label_print(struct sockaddr *);

#define ROUNDUP(a) \
        ((a) > 0 ? (1 + (((a) - 1) | (sizeof(long) - 1))) : sizeof(long))
#define ADVANCE(x, n) (x += ROUNDUP((n)->sa_len))

/*
 * Definitions for showing gateway flags.
 */
struct bits {
        int     b_mask;
        char    b_val;
};
static const struct bits bits[] = {
        { RTF_UP,       'U' },
        { RTF_GATEWAY,  'G' },
        { RTF_HOST,     'H' },
        { RTF_REJECT,   'R' },
        { RTF_DYNAMIC,  'D' },
        { RTF_MODIFIED, 'M' },
        { RTF_CLONING,  'C' },
        { RTF_MULTICAST,'m' },
        { RTF_LLINFO,   'L' },
        { RTF_STATIC,   'S' },
        { RTF_BLACKHOLE,'B' },
        { RTF_PROTO3,   '3' },
        { RTF_PROTO2,   '2' },
        { RTF_PROTO1,   '1' },
        { RTF_CLONED,   'c' },
        { RTF_CACHED,   'h' },
        { RTF_MPATH,    'P' },
        { RTF_MPLS,     'T' },
        { RTF_LOCAL,    'l' },
        { RTF_BFD,      'F' },
        { RTF_BROADCAST,'b' },
        { RTF_CONNECTED,'n' },
        { 0 }
};

int      WID_DST(int);
void     pr_rthdr(int);
void     p_rtentry(struct rt_msghdr *);
void     pr_family(int);
void     p_sockaddr_mpls(struct sockaddr *, struct sockaddr *, int, int);
void     p_flags(int, char *);
char    *routename4(in_addr_t);
char    *routename6(struct sockaddr_in6 *);
char    *netname4(in_addr_t, struct sockaddr_in *);
char    *netname6(struct sockaddr_in6 *, struct sockaddr_in6 *);

size_t
get_sysctl(const int *mib, u_int mcnt, char **buf)
{
        size_t needed;

        while (1) {
                if (sysctl(mib, mcnt, NULL, &needed, NULL, 0) == -1)
                        err(1, "sysctl-estimate");
                if (needed == 0)
                        break;
                if ((*buf = realloc(*buf, needed)) == NULL)
                        err(1, NULL);
                if (sysctl(mib, mcnt, *buf, &needed, NULL, 0) == -1) {
                        if (errno == ENOMEM)
                                continue;
                        err(1, "sysctl");
                }
                break;
        }

        return needed;
}

/*
 * Print preferred source address
 */
void
printsource(int af, u_int tableid)
{
        struct sockaddr *sa, *sa4 = NULL, *sa6 = NULL;
        char *buf = NULL, *next, *lim = NULL;
        size_t needed;
        int mib[7], mcnt;

        mib[0] = CTL_NET;
        mib[1] = PF_ROUTE;
        mib[2] = 0;
        mib[3] = af;
        mib[4] = NET_RT_SOURCE;
        mib[5] = tableid;
        mcnt = 6;

        needed = get_sysctl(mib, mcnt, &buf);
        lim = buf + needed;

        if (pledge("stdio", NULL) == -1)
                err(1, "pledge");

        if (buf) {
                for (next = buf; next < lim; next += sa->sa_len) {
                        sa = (struct sockaddr *)next;
                        switch (sa->sa_family) {
                        case AF_INET:
                                sa4 = sa;
                                break;
                        case AF_INET6:
                                sa6 = sa;
                                break;
                        }
                }
        }

        printf("Preferred source address set for rdomain %d\n", tableid);
        printf("IPv4: ");
        if (sa4 != NULL)
                p_sockaddr(sa4, NULL, RTF_HOST, WID_DST(sa4->sa_family));
        else 
                printf("default");
        printf("\n");
        printf("IPv6: ");
        if (sa6 != NULL)
                p_sockaddr(sa6, NULL, RTF_HOST, WID_DST(sa6->sa_family));
        else 
                printf("default");
        printf("\n");
        free(buf);

        exit(0);
}
/*
 * Print routing tables.
 */
void
p_rttables(int af, u_int tableid, char prio)
{
        struct rt_msghdr *rtm;
        char *buf = NULL, *next, *lim = NULL;
        size_t needed;
        int mib[7], mcnt;

        mib[0] = CTL_NET;
        mib[1] = PF_ROUTE;
        mib[2] = 0;
        mib[3] = af;
        mib[4] = NET_RT_DUMP;
        mib[5] = prio;
        mib[6] = tableid;
        mcnt = 7;

        needed = get_sysctl(mib, mcnt, &buf);
        lim = buf + needed;

        if (pledge("stdio dns", NULL) == -1)
                err(1, "pledge");

        printf("Routing tables\n");

        if (buf) {
                for (next = buf; next < lim; next += rtm->rtm_msglen) {
                        rtm = (struct rt_msghdr *)next;
                        if (rtm->rtm_version != RTM_VERSION)
                                continue;
                        p_rtentry(rtm);
                }
        }
        free(buf);
}

/*
 * column widths; each followed by one space
 * width of destination/gateway column
 * strlen("2001:0db8:3333:4444:5555:6666:7777:8888") == 39
 */
#define WID_GW(af)      ((af) == AF_INET6 ? 39 : 18)

int
WID_DST(int af)
{

        switch (af) {
        case AF_MPLS:
                return 9;
        case AF_INET6:
                /* WID_GW() + strlen("/128")  == 4 */
                return 43;
        default:
                return 18;
        }
}

/*
 * Print header for routing table columns.
 */
void
pr_rthdr(int af)
{
        switch (af) {
        case PF_KEY:
                printf("%-18s %-5s %-18s %-5s %-5s %-22s\n",
                    "Source", "Port", "Destination",
                    "Port", "Proto", "SA(Address/Proto/Type/Direction)");
                break;
        case PF_MPLS:
                printf("%-9s %-9s %-6s %-18s %-6.6s %5.5s %8.8s %5.5s  %4.4s %s\n",
                    "In label", "Out label", "Op", "Gateway",
                    "Flags", "Refs", "Use", "Mtu", "Prio", "Interface");
                break;
        default:
                printf("%-*.*s %-*.*s %-6.6s %5.5s %8.8s %5.5s  %4.4s %s",
                    WID_DST(af), WID_DST(af), "Destination",
                    WID_GW(af), WID_GW(af), "Gateway",
                    "Flags", "Refs", "Use", "Mtu", "Prio", "Iface");
                if (verbose)
                        printf(" %s", "Label");
                putchar('\n');
                break;
        }
}

void
get_rtaddrs(int addrs, struct sockaddr *sa, struct sockaddr **rti_info)
{
        int     i;

        for (i = 0; i < RTAX_MAX; i++) {
                if (addrs & (1 << i)) {
                        rti_info[i] = sa;
                        sa = (struct sockaddr *)((char *)(sa) +
                            ROUNDUP(sa->sa_len));
                } else
                        rti_info[i] = NULL;
        }
}

/*
 * Print a routing table entry.
 */
void
p_rtentry(struct rt_msghdr *rtm)
{
        static int       old_af = -1;
        struct sockaddr *sa = (struct sockaddr *)((char *)rtm + rtm->rtm_hdrlen);
        struct sockaddr *mask, *rti_info[RTAX_MAX];
        char             ifbuf[IF_NAMESIZE];
        char            *label;

        if (sa->sa_family == AF_KEY)
                return;

        get_rtaddrs(rtm->rtm_addrs, sa, rti_info);

        if (Fflag && rti_info[RTAX_GATEWAY]->sa_family != sa->sa_family) {
                return;
        }

        if (strlen(so_label.rtlabel.sr_label)) {
                if (!rti_info[RTAX_LABEL])
                        return;
                label = ((struct sockaddr_rtlabel *)rti_info[RTAX_LABEL])->
                    sr_label;
                if (strcmp(label, so_label.rtlabel.sr_label))
                        return;
        }

        if (old_af != sa->sa_family) {
                old_af = sa->sa_family;
                pr_family(sa->sa_family);
                pr_rthdr(sa->sa_family);
        }

        mask = rti_info[RTAX_NETMASK];
        if ((sa = rti_info[RTAX_DST]) == NULL)
                return;

        p_sockaddr(sa, mask, rtm->rtm_flags, WID_DST(sa->sa_family));
        p_sockaddr_mpls(sa, rti_info[RTAX_SRC], rtm->rtm_mpls,
            WID_DST(sa->sa_family));

        p_sockaddr(rti_info[RTAX_GATEWAY], NULL, RTF_HOST,
            WID_GW(sa->sa_family));

        p_flags(rtm->rtm_flags, "%-6.6s ");
        printf("%5u %8llu ", rtm->rtm_rmx.rmx_refcnt,
            rtm->rtm_rmx.rmx_pksent);
        if (rtm->rtm_rmx.rmx_mtu)
                printf("%5u ", rtm->rtm_rmx.rmx_mtu);
        else
                printf("%5s ", "-");
        putchar((rtm->rtm_rmx.rmx_locks & RTV_MTU) ? 'L' : ' ');
        printf("  %2d %-5.16s", rtm->rtm_priority,
            if_indextoname(rtm->rtm_index, ifbuf));
        if (verbose && rti_info[RTAX_LABEL])
                printf(" %s", routename(rti_info[RTAX_LABEL]));
        putchar('\n');
}

/*
 * Print address family header before a section of the routing table.
 */
void
pr_family(int af)
{
        char *afname;

        switch (af) {
        case AF_INET:
                afname = "Internet";
                break;
        case AF_INET6:
                afname = "Internet6";
                break;
        case PF_KEY:
                afname = "Encap";
                break;
        case AF_MPLS:
                afname = "MPLS";
                break;
        default:
                afname = NULL;
                break;
        }
        if (afname)
                printf("\n%s:\n", afname);
        else
                printf("\nProtocol Family %d:\n", af);
}

void
p_sockaddr(struct sockaddr *sa, struct sockaddr *mask, int flags, int width)
{
        char *cp;

        switch (sa->sa_family) {
        case AF_INET6:
            {
                struct sockaddr_in6 *sa6 = (struct sockaddr_in6 *)sa;
#ifdef __KAME__
                struct in6_addr *in6 = &sa6->sin6_addr;

                /*
                 * XXX: This is a special workaround for KAME kernels.
                 * sin6_scope_id field of SA should be set in the future.
                 */
                if ((IN6_IS_ADDR_LINKLOCAL(in6) ||
                    IN6_IS_ADDR_MC_LINKLOCAL(in6) ||
                    IN6_IS_ADDR_MC_INTFACELOCAL(in6)) &&
                    sa6->sin6_scope_id == 0) {
                        /* XXX: override is ok? */
                        sa6->sin6_scope_id = (u_int32_t)ntohs(*(u_short *)
                            &in6->s6_addr[2]);
                        *(u_short *)&in6->s6_addr[2] = 0;
                }
#endif
                if (flags & RTF_HOST)
                        cp = routename((struct sockaddr *)sa6);
                else
                        cp = netname((struct sockaddr *)sa6, mask);
                break;
            }
        case AF_MPLS:
                return;
        default:
                if ((flags & RTF_HOST) || mask == NULL)
                        cp = routename(sa);
                else
                        cp = netname(sa, mask);
                break;
        }
        if (width < 0)
                printf("%s", cp);
        else {
                if (nflag)
                        printf("%-*s ", width, cp);
                else
                        printf("%-*.*s ", width, width, cp);
        }
}

static char line[HOST_NAME_MAX+1];
static char domain[HOST_NAME_MAX+1];

void
p_sockaddr_mpls(struct sockaddr *in, struct sockaddr *out, int flags, int width)
{
        if (in->sa_family != AF_MPLS)
                return;

        if (flags & MPLS_OP_POP || flags == MPLS_OP_LOCAL) {
                printf("%-*s ", width, label_print(in));
                printf("%-*s ", width, label_print(NULL));
        } else {
                printf("%-*s ", width, label_print(in));
                printf("%-*s ", width, label_print(out));
        }

        printf("%-6s ", mpls_op(flags));
}

void
p_flags(int f, char *format)
{
        char name[33], *flags;
        const struct bits *p = bits;

        for (flags = name; p->b_mask && flags < &name[sizeof(name) - 2]; p++)
                if (p->b_mask & f)
                        *flags++ = p->b_val;
        *flags = '\0';
        printf(format, name);
}

char *
routename(struct sockaddr *sa)
{
        char *cp = NULL;
        static int first = 1;

        if (first) {
                first = 0;
                if (gethostname(domain, sizeof(domain)) == 0 &&
                    (cp = strchr(domain, '.')))
                        (void)strlcpy(domain, cp + 1, sizeof(domain));
                else
                        domain[0] = '\0';
                cp = NULL;
        }

        if (sa->sa_len == 0) {
                (void)strlcpy(line, "default", sizeof(line));
                return (line);
        }

        switch (sa->sa_family) {
        case AF_INET:
                return
                    (routename4(((struct sockaddr_in *)sa)->sin_addr.s_addr));

        case AF_INET6:
            {
                struct sockaddr_in6 sin6;

                memset(&sin6, 0, sizeof(sin6));
                memcpy(&sin6, sa, sa->sa_len);
                sin6.sin6_len = sizeof(struct sockaddr_in6);
                sin6.sin6_family = AF_INET6;
#ifdef __KAME__
                if (sa->sa_len == sizeof(struct sockaddr_in6) &&
                    (IN6_IS_ADDR_LINKLOCAL(&sin6.sin6_addr) ||
                     IN6_IS_ADDR_MC_LINKLOCAL(&sin6.sin6_addr) ||
                     IN6_IS_ADDR_MC_INTFACELOCAL(&sin6.sin6_addr)) &&
                    sin6.sin6_scope_id == 0) {
                        sin6.sin6_scope_id =
                            ntohs(*(u_int16_t *)&sin6.sin6_addr.s6_addr[2]);
                        sin6.sin6_addr.s6_addr[2] = 0;
                        sin6.sin6_addr.s6_addr[3] = 0;
                }
#endif
                return (routename6(&sin6));
            }

        case AF_LINK:
                return (link_print(sa));
        case AF_MPLS:
                return (label_print(sa));
        case AF_UNSPEC:
                if (sa->sa_len == sizeof(struct sockaddr_rtlabel)) {
                        static char name[RTLABEL_LEN + 2];
                        struct sockaddr_rtlabel *sr;

                        sr = (struct sockaddr_rtlabel *)sa;
                        snprintf(name, sizeof(name), "\"%s\"", sr->sr_label);
                        return (name);
                }
                /* FALLTHROUGH */
        default:
                (void)snprintf(line, sizeof(line), "(%d) %s",
                    sa->sa_family, any_ntoa(sa));
                break;
        }
        return (line);
}

char *
routename4(in_addr_t in)
{
        char            *cp = NULL;
        struct in_addr   ina;
        struct hostent  *hp;

        if (!cp && !nflag) {
                if ((hp = gethostbyaddr((char *)&in,
                    sizeof(in), AF_INET)) != NULL) {
                        if ((cp = strchr(hp->h_name, '.')) &&
                            !strcmp(cp + 1, domain))
                                *cp = '\0';
                        cp = hp->h_name;
                }
        }
        ina.s_addr = in;
        strlcpy(line, cp ? cp : inet_ntoa(ina), sizeof(line));

        return (line);
}

char *
routename6(struct sockaddr_in6 *sin6)
{
        int      niflags = 0;

        if (nflag)
                niflags |= NI_NUMERICHOST;
        else
                niflags |= NI_NOFQDN;

        if (getnameinfo((struct sockaddr *)sin6, sin6->sin6_len,
            line, sizeof(line), NULL, 0, niflags) != 0)
                strncpy(line, "invalid", sizeof(line));

        return (line);
}

char *
netname4(in_addr_t in, struct sockaddr_in *maskp)
{
        char *cp = NULL;
        struct hostent *hp;
        in_addr_t mask;
        int mbits;

        mask = maskp && maskp->sin_len != 0 ? ntohl(maskp->sin_addr.s_addr) : 0;
        if (!nflag && in != INADDR_ANY) {
                if ((hp = gethostbyaddr((char *)&in,
                    sizeof(in), AF_INET)) != NULL)
                        cp = hp->h_name;
        }
        if (in == INADDR_ANY && mask == INADDR_ANY)
                cp = "default";
        mbits = mask ? 33 - ffs(mask) : 0;
        in = ntohl(in);
        if (cp)
                strlcpy(line, cp, sizeof(line));
#define C(x)    ((x) & 0xff)
        else if (mbits < 9)
                snprintf(line, sizeof(line), "%u/%d", C(in >> 24), mbits);
        else if (mbits < 17)
                snprintf(line, sizeof(line), "%u.%u/%d",
                    C(in >> 24) , C(in >> 16), mbits);
        else if (mbits < 25)
                snprintf(line, sizeof(line), "%u.%u.%u/%d",
                    C(in >> 24), C(in >> 16), C(in >> 8), mbits);
        else
                snprintf(line, sizeof(line), "%u.%u.%u.%u/%d", C(in >> 24),
                    C(in >> 16), C(in >> 8), C(in), mbits);
#undef C
        return (line);
}

char *
netname6(struct sockaddr_in6 *sa6, struct sockaddr_in6 *mask)
{
        struct sockaddr_in6 sin6;
        u_char *p;
        int masklen, final = 0, illegal = 0;
        int i, lim, flag, error;
        char hbuf[NI_MAXHOST];

        sin6 = *sa6;

        flag = 0;
        masklen = 0;
        if (mask) {
                lim = mask->sin6_len - offsetof(struct sockaddr_in6, sin6_addr);
                lim = lim < (int)sizeof(struct in6_addr) ?
                    lim : (int)sizeof(struct in6_addr);
                for (p = (u_char *)&mask->sin6_addr, i = 0; i < lim; p++) {
                        if (final && *p) {
                                illegal++;
                                sin6.sin6_addr.s6_addr[i++] = 0x00;
                                continue;
                        }

                        switch (*p & 0xff) {
                        case 0xff:
                                masklen += 8;
                                break;
                        case 0xfe:
                                masklen += 7;
                                final++;
                                break;
                        case 0xfc:
                                masklen += 6;
                                final++;
                                break;
                        case 0xf8:
                                masklen += 5;
                                final++;
                                break;
                        case 0xf0:
                                masklen += 4;
                                final++;
                                break;
                        case 0xe0:
                                masklen += 3;
                                final++;
                                break;
                        case 0xc0:
                                masklen += 2;
                                final++;
                                break;
                        case 0x80:
                                masklen += 1;
                                final++;
                                break;
                        case 0x00:
                                final++;
                                break;
                        default:
                                final++;
                                illegal++;
                                break;
                        }

                        if (!illegal)
                                sin6.sin6_addr.s6_addr[i++] &= *p;
                        else
                                sin6.sin6_addr.s6_addr[i++] = 0x00;
                }
                while (i < (int)sizeof(struct in6_addr))
                        sin6.sin6_addr.s6_addr[i++] = 0x00;
        } else
                masklen = 128;

        if (masklen == 0 && IN6_IS_ADDR_UNSPECIFIED(&sin6.sin6_addr))
                return ("default");

        if (illegal)
                warnx("illegal prefixlen");

        if (nflag)
                flag |= NI_NUMERICHOST;
        error = getnameinfo((struct sockaddr *)&sin6, sin6.sin6_len,
            hbuf, sizeof(hbuf), NULL, 0, flag);
        if (error)
                snprintf(hbuf, sizeof(hbuf), "invalid");

        snprintf(line, sizeof(line), "%s/%d", hbuf, masklen);
        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(struct sockaddr *sa, struct sockaddr *mask)
{
        switch (sa->sa_family) {
        case AF_INET:
                return netname4(((struct sockaddr_in *)sa)->sin_addr.s_addr,
                    (struct sockaddr_in *)mask);
        case AF_INET6:
                return netname6((struct sockaddr_in6 *)sa,
                    (struct sockaddr_in6 *)mask);
        case AF_LINK:
                return (link_print(sa));
        case AF_MPLS:
                return (label_print(sa));
        default:
                snprintf(line, sizeof(line), "af %d: %s",
                    sa->sa_family, any_ntoa(sa));
                break;
        }
        return (line);
}

static const char hexlist[] = "0123456789abcdef";

char *
any_ntoa(const struct sockaddr *sa)
{
        static char obuf[240];
        const char *in = sa->sa_data;
        char *out = obuf;
        int len = sa->sa_len - offsetof(struct sockaddr, sa_data);

        *out++ = 'Q';
        do {
                *out++ = hexlist[(*in >> 4) & 15];
                *out++ = hexlist[(*in++)    & 15];
                *out++ = '.';
        } while (--len > 0 && (out + 3) < &obuf[sizeof(obuf) - 1]);
        out[-1] = '\0';
        return (obuf);
}

char *
link_print(struct sockaddr *sa)
{
        struct sockaddr_dl      *sdl = (struct sockaddr_dl *)sa;
        u_char                  *lla = (u_char *)sdl->sdl_data + sdl->sdl_nlen;

        if (sdl->sdl_nlen == 0 && sdl->sdl_alen == 0 &&
            sdl->sdl_slen == 0) {
                (void)snprintf(line, sizeof(line), "link#%d", sdl->sdl_index);
                return (line);
        }
        switch (sdl->sdl_type) {
        case IFT_ETHER:
        case IFT_CARP:
                return (ether_ntoa((struct ether_addr *)lla));
        default:
                return (link_ntoa(sdl));
        }
}

char *
mpls_op(u_int32_t type)
{
        switch (type & (MPLS_OP_PUSH | MPLS_OP_POP | MPLS_OP_SWAP)) {
        case MPLS_OP_LOCAL:
                return ("LOCAL");
        case MPLS_OP_POP:
                return ("POP");
        case MPLS_OP_SWAP:
                return ("SWAP");
        case MPLS_OP_PUSH:
                return ("PUSH");
        default:
                return ("?");
        }
}

char *
label_print(struct sockaddr *sa)
{
        struct sockaddr_mpls    *smpls = (struct sockaddr_mpls *)sa;

        if (smpls)
                (void)snprintf(line, sizeof(line), "%u",
                    ntohl(smpls->smpls_label) >> MPLS_LABEL_OFFSET);
        else
                (void)snprintf(line, sizeof(line), "-");

        return (line);
}