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Add -w, which prints the full width of the data being represented even if
it overflows the column, and do not truncate the base domain from displayed
host names.  This is for programmatic interfaces and for sysops
who really want to see the whole host name.

/*
 * $OpenBSD: show.c,v 1.26 2003/08/26 08:33:12 itojun Exp $
 * $NetBSD: show.c,v 1.1 1996/11/15 18:01:41 gwr Exp $
 * $DragonFly: src/sbin/route/show.c,v 1.3 2004/03/23 18:25:51 dillon 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/param.h>
#include <sys/protosw.h>
#include <sys/socket.h>
#include <sys/mbuf.h>

#include <net/if.h>
#include <net/if_dl.h>
#include <net/if_types.h>
#include <net/route.h>
#include <netinet/in.h>
#include <netns/ns.h>
#include <arpa/inet.h>

#include <sys/sysctl.h>

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

#include <netdb.h>

#include "extern.h"
#include "keywords.h"

#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_BLACKHOLE, 'B' },
	{ RTF_DYNAMIC,	'D' },
	{ RTF_MODIFIED,	'M' },
	{ RTF_DONE,	'd' }, /* Completed -- for routing messages only */
	{ RTF_CLONING,	'C' },
	{ RTF_XRESOLVE,	'X' },
	{ RTF_LLINFO,	'L' },
	{ RTF_STATIC,	'S' },
	{ RTF_PROTO1,	'1' },
	{ RTF_PROTO2,	'2' },
	{ RTF_PROTO3,	'3' },
	{ 0 }
};

static void p_rtentry(struct rt_msghdr *);
static int p_sockaddr(struct sockaddr *, int, int);
static void p_flags(int, char *);
static void pr_rthdr(void);
static void pr_family(int);

int	keyword(char *);
void	usage(char *);
void	show(int argc, char *argv[]);

/*
 * Print routing tables.
 */
void
show(int argc, char *argv[])
{
	struct rt_msghdr *rtm;
	char *buf = NULL, *next, *lim = NULL;
	size_t needed;
	int mib[6], af = 0;
        struct sockaddr *sa;

        if (argc > 1) {
                argv++;
                if (argc == 2 && **argv == '-')
                    switch (keyword(*argv + 1)) {
                        case K_INET:
                                af = AF_INET;
                                break;
#ifdef INET6
                        case K_INET6:
                                af = AF_INET6;
                                break;
#endif
                        case K_XNS:
                                af = AF_NS;
                                break;
                        case K_LINK:
                                af = AF_LINK;
                                break;
                        case K_ISO:
                        case K_OSI:
                                af = AF_ISO;
                                break;
                        case K_X25:
                                af = AF_CCITT;
                                break;
                        default:
                                goto bad;
                } else
bad:                    usage(*argv);
        }
	mib[0] = CTL_NET;
	mib[1] = PF_ROUTE;
	mib[2] = 0;
	mib[3] = 0;
	mib[4] = NET_RT_DUMP;
	mib[5] = 0;
	if (sysctl(mib, 6, NULL, &needed, NULL, 0) < 0)	{
		perror("route-sysctl-estimate");
		exit(1);
	}
	if (needed > 0) {
		if ((buf = malloc(needed)) == 0) {
			printf("out of space\n");
			exit(1);
		}
		if (sysctl(mib, 6, buf, &needed, NULL, 0) < 0) {
			perror("sysctl of routing table");
			exit(1);
		}
		lim  = buf + needed;
	}

	printf("Routing tables\n");

	if (buf) {
		for (next = buf; next < lim; next += rtm->rtm_msglen) {
			rtm = (struct rt_msghdr *)next;
			sa = (struct sockaddr *)(rtm + 1);
			if (af && sa->sa_family != af)
				continue;
			p_rtentry(rtm);
		}
		free(buf);
	}
}

/* column widths; each followed by one space */
#define	WID_DST		(nflag ? 20 : 32)	/* destination column width */
#define	WID_GW		(nflag ? 20 : 32)	/* gateway column width */

/*
 * Print header for routing table columns.
 */
static void
pr_rthdr(void)
{
	printf("%-*.*s %-*.*s %-6.6s\n",
	    WID_DST, WID_DST, "Destination",
	    WID_GW, WID_GW, "Gateway",
	    "Flags");
}

/*
 * Print a routing table entry.
 */
static void
p_rtentry(struct rt_msghdr *rtm)
{
	struct sockaddr *sa = (struct sockaddr *)(rtm + 1);
#ifdef notdef
	static int masks_done, banner_printed;
#endif
	static int old_af;
	int af = 0, interesting = RTF_UP | RTF_GATEWAY | RTF_HOST;
	int width;

#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 (old_af != af) {
		old_af = af;
		pr_family(af);
		pr_rthdr();
	}

	/*
	 * Print the information.  If wflag is set p_sockaddr() can return
	 * a wider width then specified and we try to fit the second
	 * address in any remaining space so the flags still lines up.
	 */
	if (rtm->rtm_addrs == RTA_DST) {
		p_sockaddr(sa, 0, WID_DST + WID_GW + 2);
	} else {
		width = p_sockaddr(sa, rtm->rtm_flags, WID_DST);
		sa = (struct sockaddr *)(ROUNDUP(sa->sa_len) + (char *)sa);
		p_sockaddr(sa, 0, WID_GW + WID_DST - width);
	}
	p_flags(rtm->rtm_flags & interesting, "%-6.6s ");
	putchar('\n');
}

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

	switch (af) {
	case AF_INET:
		afname = "Internet";
		break;
#ifdef INET6
	case AF_INET6:
		afname = "Internet6";
		break;
#endif /* INET6 */
	case AF_NS:
		afname = "XNS";
		break;
	case AF_IPX:
		afname = "IPX";
		break;
	case AF_ISO:
		afname = "ISO";
		break;
	case AF_CCITT:
		afname = "X.25";
		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);
}

static int
p_sockaddr(struct sockaddr *sa, int flags, int width)
{
	char workbuf[128], *cplim;
	char *cp = workbuf;
	int len = sizeof(workbuf);
	int count;

	switch(sa->sa_family) {

	case AF_LINK:
	    {
		struct sockaddr_dl *sdl = (struct sockaddr_dl *)sa;

		if (sdl->sdl_nlen == 0 && sdl->sdl_alen == 0 &&
		    sdl->sdl_slen == 0)
			snprintf(workbuf, sizeof(workbuf),
			    "link#%d", sdl->sdl_index);
		else {
			switch (sdl->sdl_type) {
			case IFT_ETHER:
			    {
				int i;
				u_char *lla = (u_char *)sdl->sdl_data +
				    sdl->sdl_nlen;

				cplim = "";
				for (i = 0; i < sdl->sdl_alen; i++, lla++) {
					snprintf(cp, len, "%s%x", cplim, *lla);
					len -= strlen(cp);
					cp += strlen(cp);
					if (len <= 0)
						break;	/* overflow */
					cplim = ":";
				}
				cp = workbuf;
				break;
			    }
			default:
				cp = link_ntoa(sdl);
				break;
			}
		}
		break;
	    }

	case AF_INET:
	    {
		struct sockaddr_in *sin = (struct sockaddr_in *)sa;

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

#ifdef INET6
	case AF_INET6:
	    {
		struct sockaddr_in6 *sin = (struct sockaddr_in6 *)sa;

		cp = IN6_IS_ADDR_UNSPECIFIED(&sin->sin6_addr) ? "default" :
			((flags & RTF_HOST) ?  routename(sa) :	netname(sa));
		/* make sure numeric address is not truncated */
		if (strchr(cp, ':') != NULL && strlen(cp) > width)
			width = strlen(cp);
		break;
	    }
#endif /* INET6 */

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

	default:
	    {
		u_char *s = (u_char *)sa->sa_data, *slim;

		slim =  sa->sa_len + (u_char *) sa;
		cplim = cp + sizeof(workbuf) - 6;
		snprintf(cp, len, "(%d)", sa->sa_family);
		len -= strlen(cp);
		cp += strlen(cp);
		if (len <= 0) {
			cp = workbuf;
			break;		/* overflow */
		}
		while (s < slim && cp < cplim) {
			snprintf(cp, len, " %02x", *s++);
			len -= strlen(cp);
			cp += strlen(cp);
			if (len <= 0)
				break;		/* overflow */
			if (s < slim) {
				snprintf(cp, len, "%02x", *s++);
				len -= strlen(cp);
				cp += strlen(cp);
				if (len <= 0)
					break;		/* overflow */
			}
		}
		cp = workbuf;
	    }
	}
	if (width < 0 ) {
		count = printf("%s ", cp);
	} else {
		if (nflag || wflag)
			count = printf("%-*s ", width, cp);
		else
			count = printf("%-*.*s ", width, width, cp);
	}
	return(count);
}

static 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);
}