apps/snmpnetstat/route.c - vendor/opensource/netsnmp - Git at Google

 /*	$OpenBSD: route.c,v 1.66 2004/11/17 01:47:20 itojun Exp $	*/
 /*	$NetBSD: route.c,v 1.15 1996/05/07 02:55:06 thorpej 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.
  */

 #ifdef  INHERITED_CODE
 #ifndef lint
 #if 0
 static char sccsid[] = "from: @(#)route.c	8.3 (Berkeley) 3/9/94";
 #else
 static char *rcsid = "$OpenBSD: route.c,v 1.66 2004/11/17 01:47:20 itojun Exp $";
 #endif
 #endif /* not lint */
 #endif

 #include <net-snmp/net-snmp-config.h>

 #if HAVE_SYS_TYPES_H
 #include <sys/types.h>
 #endif

 #if HAVE_NETINET_IN_H
 #include <netinet/in.h>
 #endif
 #if HAVE_ARPA_INET_H
 #include <arpa/inet.h>
 #endif

 #include <net-snmp/net-snmp-includes.h>

 #if HAVE_UNISTD_H
 #include <unistd.h>
 #endif
 #if HAVE_NETDB_H
 #include <netdb.h>
 #endif

 #ifndef INET
 #define INET
 #endif

 #include "main.h"
 #include "netstat.h"
 #if HAVE_WINSOCK_H
 #include "winstub.h"
 #endif

 #define SET_MASK 0x01
 #define SET_GWAY 0x02
 #define SET_IFNO 0x04
 #define SET_TYPE 0x08
 #define SET_PRTO 0x10
 #define SET_ALL  0x1f

 struct route_entry {
     oid             instance[4];
     in_addr_t       destination;
     in_addr_t       mask;
     in_addr_t       gateway;
     int             ifNumber;
     int             type;
     int             proto;
     int             set_bits;
     char            ifname[64];
 };

 void p_rtnode( struct route_entry *rp );
 extern int _ffs(int mask);

 /*
  * Print routing tables.
  */
 void
 routepr(void)
 {
     struct route_entry  route, *rp = &route;
     oid    rtcol_oid[]  = { 1,3,6,1,2,1,4,21,1,0 };
     size_t rtcol_len    = OID_LENGTH( rtcol_oid );
     union {
         in_addr_t addr;
         char      data[4];
     } tmpAddr;
     netsnmp_variable_list *var=NULL, *vp;
     char  *cp;

     printf("Routing tables\n");
     pr_rthdr(AF_INET);

 #define ADD_RTVAR( x ) rtcol_oid[ rtcol_len-1 ] = x; \
     snmp_varlist_add_variable( &var, rtcol_oid, rtcol_len, ASN_NULL, NULL,  0)
     ADD_RTVAR( 2 );                 /* ipRouteIfIndex */
     ADD_RTVAR( 7 );                 /* ipRouteNextHop */
     ADD_RTVAR( 8 );                 /* ipRouteType    */
     ADD_RTVAR( 9 );                 /* ipRouteProto   */
     ADD_RTVAR( 11 );                /* ipRouteMask    */
 #undef ADD_RTVAR

         /*
 	 * Now walk the ipRouteTable, reporting the various route entries
 	 */
     while ( 1 ) {
         if (netsnmp_query_getnext( var, ss ) != SNMP_ERR_NOERROR)
             break;
         rtcol_oid[ rtcol_len-1 ] = 2;	/* ifRouteIfIndex */
         if ( snmp_oid_compare( rtcol_oid, rtcol_len,
                                var->name, rtcol_len) != 0 )
             break;    /* End of Table */
         memset( &route, 0, sizeof( struct route_entry ));
         /* Extract ipRouteDest index value */
         cp = tmpAddr.data;
         cp[0] = var->name[ 10 ] & 0xff;
         cp[1] = var->name[ 11 ] & 0xff;
         cp[2] = var->name[ 12 ] & 0xff;
         cp[3] = var->name[ 13 ] & 0xff;
         rp->destination = tmpAddr.addr;

         for ( vp=var; vp; vp=vp->next_variable ) {
             switch ( vp->name[ 9 ] ) {
             case 2:     /* ifRouteIfIndex */
                 rp->ifNumber  = *vp->val.integer;
                 rp->set_bits |= SET_IFNO;
                 break;
             case 7:                 /* ipRouteNextHop */
                 memmove(&rp->gateway, vp->val.string, 4);
                 rp->set_bits |= SET_GWAY;
                 break;
             case 8:                 /* ipRouteType    */
                 rp->type      = *vp->val.integer;
                 rp->set_bits |= SET_TYPE;
                 break;
             case 9:                 /* ipRouteProto   */
                 rp->proto     = *vp->val.integer;
                 rp->set_bits |= SET_PRTO;
                 break;
             case 11:                /* ipRouteMask    */
                 memmove(&rp->mask, vp->val.string, 4);
                 rp->set_bits |= SET_MASK;
                 break;
             }
         }
         if (rp->set_bits != SET_ALL) {
             continue;   /* Incomplete query */
         }

         p_rtnode( rp );
     }
 }


 struct iflist {
     int             index;
     char            name[64];
     struct iflist  *next;
 }              *Iflist = NULL;

 void
 get_ifname(char *name, int ifIndex)
 {
     oid    ifdescr_oid[]  = { 1,3,6,1,2,1,2,2,1,2,0 };
     size_t ifdescr_len    = OID_LENGTH( ifdescr_oid );
     netsnmp_variable_list *var = NULL;
     struct iflist         *ip;

     for (ip = Iflist; ip; ip = ip->next) {
         if (ip->index == ifIndex)
             break;
     }
     if (ip) {
         strcpy(name, ip->name);
         return;
     }
     ip = (struct iflist *) malloc(sizeof(struct iflist));
     if (ip == NULL)
         return;
     ip->next = Iflist;
     Iflist = ip;
     ip->index = ifIndex;

     ifdescr_oid[ ifdescr_len-1 ] = ifIndex;
     snmp_varlist_add_variable( &var, ifdescr_oid, ifdescr_len,
                                ASN_NULL, NULL,  0);
     if (netsnmp_query_get( var, ss ) == SNMP_ERR_NOERROR) {
         if (var->val_len >= sizeof(ip->name))
             var->val_len  = sizeof(ip->name) - 1;
         memmove(ip->name, var->val.string, var->val_len);
         ip->name[var->val_len] = '\0';
     } else {
         sprintf(ip->name, "if%d", ifIndex);
     }
     strcpy(name, ip->name);
 }

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

 	switch (af) {
 	case AF_INET:
 		afname = "Internet";
 		break;
 #ifdef NETSNMP_ENABLE_IPV6
 	case AF_INET6:
 		afname = "Internet6";
 		break;
 #endif
     /*
 	case AF_NS:
 		afname = "XNS";
 		break;
 	case AF_IPX:
 		afname = "IPX";
 		break;
 	case AF_CCITT:
 		afname = "X.25";
 		break;
 	case PF_KEY:
 		afname = "Encap";
 		break;
 	case AF_APPLETALK:
 		afname = "AppleTalk";
 		break;
      */
 	default:
 		afname = NULL;
 		break;
 	}
 	if (afname)
 		printf("\n%s:\n", afname);
 	else
 		printf("\nProtocol Family %d:\n", af);
 }

 /* column widths; each followed by one space */
 #ifndef NETSNMP_ENABLE_IPV6
 #define	WID_DST(af)	26	/* width of destination column */
 #define	WID_GW(af)	18	/* width of gateway column */
 #else
 /* width of destination/gateway column */
 #if 1
 /* strlen("fe80::aaaa:bbbb:cccc:dddd@gif0") == 30, strlen("/128") == 4 */
 #define	WID_DST(af)	((af) == AF_INET6 ? (nflag ? 34 : 26) : 26)
 #define	WID_GW(af)	((af) == AF_INET6 ? (nflag ? 30 : 18) : 18)
 #else
 /* strlen("fe80::aaaa:bbbb:cccc:dddd") == 25, strlen("/128") == 4 */
 #define	WID_DST(af)	((af) == AF_INET6 ? (nflag ? 29 : 18) : 18)
 #define	WID_GW(af)	((af) == AF_INET6 ? (nflag ? 25 : 18) : 18)
 #endif
 #endif /* NETSNMP_ENABLE_IPV6 */

 /*
  * Print header for routing table columns.
  */
 void
 pr_rthdr(int af)
 {
    /*
 	if (Aflag)
 		printf("%-*.*s ", PLEN, PLEN, "Address");
 	if (Sflag)
 		printf("%-*.*s ",
 		    WID_DST(af), WID_DST(af), "Source");
     */
 	printf("%-*.*s ",
 	    WID_DST(af), WID_DST(af), "Destination");
 	printf("%-*.*s %-6.6s  %s\n",
 	    WID_GW(af), WID_GW(af), "Gateway",
 	    "Flags", "Interface");
 }

 /*
  * Print header for PF_KEY entries.
 void
 pr_encaphdr(void)
 {
 	if (Aflag)
 		printf("%-*s ", PLEN, "Address");
 	printf("%-18s %-5s %-18s %-5s %-5s %-22s\n",
 	    "Source", "Port", "Destination",
 	    "Port", "Proto", "SA(Address/Proto/Type/Direction)");
 }
  */

 char *
 routename(in_addr_t in)
 {
 	char *cp;
 	static char line[MAXHOSTNAMELEN];
 	struct hostent *hp;
 	static char domain[MAXHOSTNAMELEN];
 	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 (!nflag) {
 		hp = gethostbyaddr((char *)&in, sizeof (struct in_addr),
 		    AF_INET);
 		if (hp) {
 			if ((cp = strchr(hp->h_name, '.')) &&
 			    !strcmp(cp + 1, domain))
 				*cp = '\0';
 			cp = hp->h_name;
 		}
 	}
 	if (cp) {
 		strlcpy(line, cp, sizeof(line));
 	} else {
 #define C(x)	(unsigned)((x) & 0xff)
 		in = ntohl(in);
 		snprintf(line, sizeof line, "%u.%u.%u.%u",
 		    C(in >> 24), C(in >> 16), C(in >> 8), C(in));
 	}
 	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_addr_t in, in_addr_t mask)
 {
 	char *cp = NULL;
 	static char line[MAXHOSTNAMELEN];
 	struct netent *np = NULL;
 	int mbits;

 	in = ntohl(in);
 	mask = ntohl(mask);
 	if (!nflag && in != INADDR_ANY) {
 		if ((np = getnetbyaddr(in, AF_INET)) != NULL)
 			cp = np->n_name;
 	}
 	mbits = mask ? 33 - _ffs(mask) : 0;
 	if (cp) {
 		strlcpy(line, cp, sizeof(line));
 	} 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);
 	return (line);
 }

 #undef NETSNMP_ENABLE_IPV6
 #ifdef NETSNMP_ENABLE_IPV6
 char *
 netname6(struct sockaddr_in6 *sa6, struct in6_addr *mask)
 {
 	static char line[MAXHOSTNAMELEN + 1];
 	struct sockaddr_in6 sin6;
 	u_char *p;
 	u_char *lim;
 	int masklen, final = 0, illegal = 0;
 	int i;
 	char hbuf[NI_MAXHOST];
 	int flag = 0;
 	int error;

 	sin6 = *sa6;

 	masklen = 0;
 	lim = (u_char *)(mask + 1);
 	i = 0;
 	if (mask) {
 		for (p = (u_char *)mask; p < 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;
 		}
 	} else
 		masklen = 128;

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

 	if (illegal)
 		fprintf(stderr, "illegal prefixlen\n");

 	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;
 }

 char *
 routename6(struct sockaddr_in6 *sa6)
 {
 	static char line[NI_MAXHOST];
 	const int niflag = NI_NUMERICHOST;

 	if (getnameinfo((struct sockaddr *)sa6, sa6->sin6_len,
 	    line, sizeof(line), NULL, 0, niflag) != 0)
 		strlcpy(line, "", sizeof line);
 	return line;
 }
 #endif /*NETSNMP_ENABLE_IPV6*/

 char *
 s_rtflags( struct route_entry *rp )
 {
     static char flag_buf[10];
     char  *cp = flag_buf;

     memset( flag_buf, 0, sizeof(flag_buf));
     *cp++ = '<';
     *cp++ = 'U';   /* route is in use */
     if (rp->mask  == 0xffffffff)
         *cp++ = 'H';   /* host */
     if (rp->proto == 4)
         *cp++ = 'D';   /* ICMP redirect */
     if (rp->type  == 4)
         *cp++ = 'G';   /* remote destination/net */
     *cp++ = '>';
     return flag_buf;
 }

 void
 p_rtnode( struct route_entry *rp )
 {
     get_ifname(rp->ifname, rp->ifNumber);
     printf("%-*.*s ",
 	    WID_DST(AF_INET), WID_DST(AF_INET),
             (rp->destination == INADDR_ANY) ? "default" :
                 (rp->set_bits & SET_MASK) ?
                     (rp->mask == 0xffffffff ?
                         routename(rp->destination) :
                         netname(rp->destination, rp->mask)) :
                     netname(rp->destination, 0L));
     printf("%-*.*s %-6.6s  %s\n",
 	    WID_GW(af), WID_GW(af),
 	    rp->gateway ? routename(rp->gateway) : "*",
             s_rtflags(rp), rp->ifname);
 }
	/* $OpenBSD: route.c,v 1.66 2004/11/17 01:47:20 itojun Exp $ */
	/* $NetBSD: route.c,v 1.15 1996/05/07 02:55:06 thorpej 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.
	*/

	#ifdef INHERITED_CODE
	#ifndef lint
	#if 0
	static char sccsid[] = "from: @(#)route.c 8.3 (Berkeley) 3/9/94";
	#else
	static char *rcsid = "$OpenBSD: route.c,v 1.66 2004/11/17 01:47:20 itojun Exp $";
	#endif
	#endif /* not lint */
	#endif

	#include <net-snmp/net-snmp-config.h>

	#if HAVE_SYS_TYPES_H
	#include <sys/types.h>
	#endif

	#if HAVE_NETINET_IN_H
	#include <netinet/in.h>
	#endif
	#if HAVE_ARPA_INET_H
	#include <arpa/inet.h>
	#endif

	#include <net-snmp/net-snmp-includes.h>

	#if HAVE_UNISTD_H
	#include <unistd.h>
	#endif
	#if HAVE_NETDB_H
	#include <netdb.h>
	#endif

	#ifndef INET
	#define INET
	#endif

	#include "main.h"
	#include "netstat.h"
	#if HAVE_WINSOCK_H
	#include "winstub.h"
	#endif

	#define SET_MASK 0x01
	#define SET_GWAY 0x02
	#define SET_IFNO 0x04
	#define SET_TYPE 0x08
	#define SET_PRTO 0x10
	#define SET_ALL 0x1f

	struct route_entry {
	oid instance[4];
	in_addr_t destination;
	in_addr_t mask;
	in_addr_t gateway;
	int ifNumber;
	int type;
	int proto;
	int set_bits;
	char ifname[64];
	};

	void p_rtnode( struct route_entry *rp );
	extern int _ffs(int mask);

	/*
	* Print routing tables.
	*/
	void
	routepr(void)
	{
	struct route_entry route, *rp = &route;
	oid rtcol_oid[] = { 1,3,6,1,2,1,4,21,1,0 };
	size_t rtcol_len = OID_LENGTH( rtcol_oid );
	union {
	in_addr_t addr;
	char data[4];
	} tmpAddr;
	netsnmp_variable_list var=NULL, vp;
	char *cp;

	printf("Routing tables\n");
	pr_rthdr(AF_INET);

	#define ADD_RTVAR( x ) rtcol_oid[ rtcol_len-1 ] = x; \
	snmp_varlist_add_variable( &var, rtcol_oid, rtcol_len, ASN_NULL, NULL, 0)
	ADD_RTVAR( 2 ); /* ipRouteIfIndex */
	ADD_RTVAR( 7 ); /* ipRouteNextHop */
	ADD_RTVAR( 8 ); /* ipRouteType */
	ADD_RTVAR( 9 ); /* ipRouteProto */
	ADD_RTVAR( 11 ); /* ipRouteMask */
	#undef ADD_RTVAR

	/*
	* Now walk the ipRouteTable, reporting the various route entries
	*/
	while ( 1 ) {
	if (netsnmp_query_getnext( var, ss ) != SNMP_ERR_NOERROR)
	break;
	rtcol_oid[ rtcol_len-1 ] = 2; /* ifRouteIfIndex */
	if ( snmp_oid_compare( rtcol_oid, rtcol_len,
	var->name, rtcol_len) != 0 )
	break; /* End of Table */
	memset( &route, 0, sizeof( struct route_entry ));
	/* Extract ipRouteDest index value */
	cp = tmpAddr.data;
	cp[0] = var->name[ 10 ] & 0xff;
	cp[1] = var->name[ 11 ] & 0xff;
	cp[2] = var->name[ 12 ] & 0xff;
	cp[3] = var->name[ 13 ] & 0xff;
	rp->destination = tmpAddr.addr;

	for ( vp=var; vp; vp=vp->next_variable ) {
	switch ( vp->name[ 9 ] ) {
	case 2: /* ifRouteIfIndex */
	rp->ifNumber = *vp->val.integer;
	rp->set_bits \|= SET_IFNO;
	break;
	case 7: /* ipRouteNextHop */
	memmove(&rp->gateway, vp->val.string, 4);
	rp->set_bits \|= SET_GWAY;
	break;
	case 8: /* ipRouteType */
	rp->type = *vp->val.integer;
	rp->set_bits \|= SET_TYPE;
	break;
	case 9: /* ipRouteProto */
	rp->proto = *vp->val.integer;
	rp->set_bits \|= SET_PRTO;
	break;
	case 11: /* ipRouteMask */
	memmove(&rp->mask, vp->val.string, 4);
	rp->set_bits \|= SET_MASK;
	break;
	}
	}
	if (rp->set_bits != SET_ALL) {
	continue; /* Incomplete query */
	}

	p_rtnode( rp );
	}
	}



	struct iflist {
	int index;
	char name[64];
	struct iflist *next;
	} *Iflist = NULL;

	void
	get_ifname(char *name, int ifIndex)
	{
	oid ifdescr_oid[] = { 1,3,6,1,2,1,2,2,1,2,0 };
	size_t ifdescr_len = OID_LENGTH( ifdescr_oid );
	netsnmp_variable_list *var = NULL;
	struct iflist *ip;

	for (ip = Iflist; ip; ip = ip->next) {
	if (ip->index == ifIndex)
	break;
	}
	if (ip) {
	strcpy(name, ip->name);
	return;
	}
	ip = (struct iflist *) malloc(sizeof(struct iflist));
	if (ip == NULL)
	return;
	ip->next = Iflist;
	Iflist = ip;
	ip->index = ifIndex;

	ifdescr_oid[ ifdescr_len-1 ] = ifIndex;
	snmp_varlist_add_variable( &var, ifdescr_oid, ifdescr_len,
	ASN_NULL, NULL, 0);
	if (netsnmp_query_get( var, ss ) == SNMP_ERR_NOERROR) {
	if (var->val_len >= sizeof(ip->name))
	var->val_len = sizeof(ip->name) - 1;
	memmove(ip->name, var->val.string, var->val_len);
	ip->name[var->val_len] = '\0';
	} else {
	sprintf(ip->name, "if%d", ifIndex);
	}
	strcpy(name, ip->name);
	}

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

	switch (af) {
	case AF_INET:
	afname = "Internet";
	break;
	#ifdef NETSNMP_ENABLE_IPV6
	case AF_INET6:
	afname = "Internet6";
	break;
	#endif
	/*
	case AF_NS:
	afname = "XNS";
	break;
	case AF_IPX:
	afname = "IPX";
	break;
	case AF_CCITT:
	afname = "X.25";
	break;
	case PF_KEY:
	afname = "Encap";
	break;
	case AF_APPLETALK:
	afname = "AppleTalk";
	break;
	*/
	default:
	afname = NULL;
	break;
	}
	if (afname)
	printf("\n%s:\n", afname);
	else
	printf("\nProtocol Family %d:\n", af);
	}

	/* column widths; each followed by one space */
	#ifndef NETSNMP_ENABLE_IPV6
	#define WID_DST(af) 26 /* width of destination column */
	#define WID_GW(af) 18 /* width of gateway column */
	#else
	/* width of destination/gateway column */
	#if 1
	/* strlen("fe80::aaaa:bbbb:cccc:dddd@gif0") == 30, strlen("/128") == 4 */
	#define WID_DST(af) ((af) == AF_INET6 ? (nflag ? 34 : 26) : 26)
	#define WID_GW(af) ((af) == AF_INET6 ? (nflag ? 30 : 18) : 18)
	#else
	/* strlen("fe80::aaaa:bbbb:cccc:dddd") == 25, strlen("/128") == 4 */
	#define WID_DST(af) ((af) == AF_INET6 ? (nflag ? 29 : 18) : 18)
	#define WID_GW(af) ((af) == AF_INET6 ? (nflag ? 25 : 18) : 18)
	#endif
	#endif /* NETSNMP_ENABLE_IPV6 */

	/*
	* Print header for routing table columns.
	*/
	void
	pr_rthdr(int af)
	{
	/*
	if (Aflag)
	printf("%-.s ", PLEN, PLEN, "Address");
	if (Sflag)
	printf("%-.s ",
	WID_DST(af), WID_DST(af), "Source");
	*/
	printf("%-.s ",
	WID_DST(af), WID_DST(af), "Destination");
	printf("%-.s %-6.6s %s\n",
	WID_GW(af), WID_GW(af), "Gateway",
	"Flags", "Interface");
	}

	/*
	* Print header for PF_KEY entries.
	void
	pr_encaphdr(void)
	{
	if (Aflag)
	printf("%-*s ", PLEN, "Address");
	printf("%-18s %-5s %-18s %-5s %-5s %-22s\n",
	"Source", "Port", "Destination",
	"Port", "Proto", "SA(Address/Proto/Type/Direction)");
	}
	*/

	char *
	routename(in_addr_t in)
	{
	char *cp;
	static char line[MAXHOSTNAMELEN];
	struct hostent *hp;
	static char domain[MAXHOSTNAMELEN];
	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 (!nflag) {
	hp = gethostbyaddr((char *)&in, sizeof (struct in_addr),
	AF_INET);
	if (hp) {
	if ((cp = strchr(hp->h_name, '.')) &&
	!strcmp(cp + 1, domain))
	*cp = '\0';
	cp = hp->h_name;
	}
	}
	if (cp) {
	strlcpy(line, cp, sizeof(line));
	} else {
	#define C(x) (unsigned)((x) & 0xff)
	in = ntohl(in);
	snprintf(line, sizeof line, "%u.%u.%u.%u",
	C(in >> 24), C(in >> 16), C(in >> 8), C(in));
	}
	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_addr_t in, in_addr_t mask)
	{
	char *cp = NULL;
	static char line[MAXHOSTNAMELEN];
	struct netent *np = NULL;
	int mbits;

	in = ntohl(in);
	mask = ntohl(mask);
	if (!nflag && in != INADDR_ANY) {
	if ((np = getnetbyaddr(in, AF_INET)) != NULL)
	cp = np->n_name;
	}
	mbits = mask ? 33 - _ffs(mask) : 0;
	if (cp) {
	strlcpy(line, cp, sizeof(line));
	} 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);
	return (line);
	}

	#undef NETSNMP_ENABLE_IPV6
	#ifdef NETSNMP_ENABLE_IPV6
	char *
	netname6(struct sockaddr_in6 sa6, struct in6_addr mask)
	{
	static char line[MAXHOSTNAMELEN + 1];
	struct sockaddr_in6 sin6;
	u_char *p;
	u_char *lim;
	int masklen, final = 0, illegal = 0;
	int i;
	char hbuf[NI_MAXHOST];
	int flag = 0;
	int error;

	sin6 = *sa6;

	masklen = 0;
	lim = (u_char *)(mask + 1);
	i = 0;
	if (mask) {
	for (p = (u_char *)mask; p < 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;
	}
	} else
	masklen = 128;

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

	if (illegal)
	fprintf(stderr, "illegal prefixlen\n");

	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;
	}

	char *
	routename6(struct sockaddr_in6 *sa6)
	{
	static char line[NI_MAXHOST];
	const int niflag = NI_NUMERICHOST;

	if (getnameinfo((struct sockaddr *)sa6, sa6->sin6_len,
	line, sizeof(line), NULL, 0, niflag) != 0)
	strlcpy(line, "", sizeof line);
	return line;
	}
	#endif /NETSNMP_ENABLE_IPV6/

	char *
	s_rtflags( struct route_entry *rp )
	{
	static char flag_buf[10];
	char *cp = flag_buf;

	memset( flag_buf, 0, sizeof(flag_buf));
	*cp++ = '<';
	cp++ = 'U'; / route is in use */
	if (rp->mask == 0xffffffff)
	cp++ = 'H'; / host */
	if (rp->proto == 4)
	cp++ = 'D'; / ICMP redirect */
	if (rp->type == 4)
	cp++ = 'G'; / remote destination/net */
	*cp++ = '>';
	return flag_buf;
	}

	void
	p_rtnode( struct route_entry *rp )
	{
	get_ifname(rp->ifname, rp->ifNumber);
	printf("%-.s ",
	WID_DST(AF_INET), WID_DST(AF_INET),
	(rp->destination == INADDR_ANY) ? "default" :
	(rp->set_bits & SET_MASK) ?
	(rp->mask == 0xffffffff ?
	routename(rp->destination) :
	netname(rp->destination, rp->mask)) :
	netname(rp->destination, 0L));
	printf("%-.s %-6.6s %s\n",
	WID_GW(af), WID_GW(af),
	rp->gateway ? routename(rp->gateway) : "*",
	s_rtflags(rp), rp->ifname);
	}