[unix-history] / usr / src / usr.sbin / arp / arp.c

/*
 * Copyright (c) 1984, 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * Sun Microsystems, Inc.
 *
 * %sccs.include.redist.c%
 */

#ifndef lint
static char copyright[] =
"@(#) Copyright (c) 1984, 1993\n\
	The Regents of the University of California.  All rights reserved.\n";
#endif /* not lint */

#ifndef lint
static char sccsid[] = "@(#)arp.c	8.2 (Berkeley) %G%";
#endif /* not lint */

/*
 * arp - display, set, and delete arp table entries
 */

#include <sys/param.h>
#include <sys/file.h>
#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 <arpa/inet.h>

#include <netdb.h>
#include <errno.h>
#include <nlist.h>
#include <kvm.h>
#include <stdio.h>
#include <paths.h>

extern int errno;
static int pid;
static int nflag;
static int s = -1;

main(argc, argv)
	int argc;
	char **argv;
{
	int ch;

	pid = getpid();
	while ((ch = getopt(argc, argv, "ands")) != EOF)
		switch((char)ch) {
		case 'a':
			dump(0);
			exit(0);
		case 'd':
			if (argc < 3 || argc > 4)
				usage();
			delete(argv[2], argv[3]);
			exit(0);
		case 'n':
			nflag = 1;
			continue;
		case 's':
			if (argc < 4 || argc > 7)
				usage();
			exit(set(argc-2, &argv[2]) ? 1 : 0);
		case '?':
		default:
			usage();
		}
	if (argc != 2)
		usage();
	get(argv[1]);
	exit(0);
}

/*
 * Process a file to set standard arp entries
 */
file(name)
	char *name;
{
	FILE *fp;
	int i, retval;
	char line[100], arg[5][50], *args[5];

	if ((fp = fopen(name, "r")) == NULL) {
		fprintf(stderr, "arp: cannot open %s\n", name);
		exit(1);
	}
	args[0] = &arg[0][0];
	args[1] = &arg[1][0];
	args[2] = &arg[2][0];
	args[3] = &arg[3][0];
	args[4] = &arg[4][0];
	retval = 0;
	while(fgets(line, 100, fp) != NULL) {
		i = sscanf(line, "%s %s %s %s %s", arg[0], arg[1], arg[2],
		    arg[3], arg[4]);
		if (i < 2) {
			fprintf(stderr, "arp: bad line: %s\n", line);
			retval = 1;
			continue;
		}
		if (set(i, args))
			retval = 1;
	}
	fclose(fp);
	return (retval);
}

getsocket() {
	if (s < 0) {
		s = socket(PF_ROUTE, SOCK_RAW, 0);
		if (s < 0) {
			perror("arp: socket");
			exit(1);
		}
	}
}

struct	sockaddr_in so_mask = {8, 0, 0, { 0xffffffff}};
struct	sockaddr_inarp blank_sin = {sizeof(blank_sin), AF_INET }, sin_m;
struct	sockaddr_dl blank_sdl = {sizeof(blank_sdl), AF_LINK }, sdl_m;
int	expire_time, flags, export_only, doing_proxy, found_entry;
struct	{
	struct	rt_msghdr m_rtm;
	char	m_space[512];
}	m_rtmsg;

/*
 * Set an individual arp entry 
 */
set(argc, argv)
	int argc;
	char **argv;
{
	struct hostent *hp;
	register struct sockaddr_inarp *sin = &sin_m;
	register struct sockaddr_dl *sdl;
	register struct rt_msghdr *rtm = &(m_rtmsg.m_rtm);
	u_char *ea;
	char *host = argv[0], *eaddr = argv[1];

	getsocket();
	argc -= 2;
	argv += 2;
	sdl_m = blank_sdl;
	sin_m = blank_sin;
	sin->sin_addr.s_addr = inet_addr(host);
	if (sin->sin_addr.s_addr == -1) {
		if (!(hp = gethostbyname(host))) {
			fprintf(stderr, "arp: %s: ", host);
			herror((char *)NULL);
			return (1);
		}
		bcopy((char *)hp->h_addr, (char *)&sin->sin_addr,
		    sizeof sin->sin_addr);
	}
	ea = (u_char *)LLADDR(&sdl_m);
	if (ether_aton(eaddr, ea) == 0)
		sdl_m.sdl_alen = 6;
	doing_proxy = flags = export_only = expire_time = 0;
	while (argc-- > 0) {
		if (strncmp(argv[0], "temp", 4) == 0) {
			struct timeval time;
			gettimeofday(&time, 0);
			expire_time = time.tv_sec + 20 * 60;
		}
		else if (strncmp(argv[0], "pub", 3) == 0) {
			flags |= RTF_ANNOUNCE;
			doing_proxy = SIN_PROXY;
		} else if (strncmp(argv[0], "trail", 5) == 0) {
			printf("%s: Sending trailers is no longer supported\n",
				host);
		}
		argv++;
	}
tryagain:
	if (rtmsg(RTM_GET) < 0) {
		perror(host);
		return (1);
	}
	sin = (struct sockaddr_inarp *)(rtm + 1);
	sdl = (struct sockaddr_dl *)(sin->sin_len + (char *)sin);
	if (sin->sin_addr.s_addr == sin_m.sin_addr.s_addr) {
		if (sdl->sdl_family == AF_LINK &&
		    (rtm->rtm_flags & RTF_LLINFO) &&
		    !(rtm->rtm_flags & RTF_GATEWAY)) switch (sdl->sdl_type) {
		case IFT_ETHER: case IFT_FDDI: case IFT_ISO88023:
		case IFT_ISO88024: case IFT_ISO88025:
			goto overwrite;
		}
		if (doing_proxy == 0) {
			printf("set: can only proxy for %s\n", host);
			return (1);
		}
		if (sin_m.sin_other & SIN_PROXY) {
			printf("set: proxy entry exists for non 802 device\n");
			return(1);
		}
		sin_m.sin_other = SIN_PROXY;
		export_only = 1;
		goto tryagain;
	}
overwrite:
	if (sdl->sdl_family != AF_LINK) {
		printf("cannot intuit interface index and type for %s\n", host);
		return (1);
	}
	sdl_m.sdl_type = sdl->sdl_type;
	sdl_m.sdl_index = sdl->sdl_index;
	return (rtmsg(RTM_ADD));
}

/*
 * Display an individual arp entry
 */
get(host)
	char *host;
{
	struct hostent *hp;
	struct sockaddr_inarp *sin = &sin_m;
	u_char *ea;

	sin_m = blank_sin;
	sin->sin_addr.s_addr = inet_addr(host);
	if (sin->sin_addr.s_addr == -1) {
		if (!(hp = gethostbyname(host))) {
			fprintf(stderr, "arp: %s: ", host);
			herror((char *)NULL);
			exit(1);
		}
		bcopy((char *)hp->h_addr, (char *)&sin->sin_addr,
		    sizeof sin->sin_addr);
	}
	dump(sin->sin_addr.s_addr);
	if (found_entry == 0) {
		printf("%s (%s) -- no entry\n",
		    host, inet_ntoa(sin->sin_addr));
		exit(1);
	}
}

/*
 * Delete an arp entry 
 */
delete(host, info)
	char *host;
	char *info;
{
	struct hostent *hp;
	register struct sockaddr_inarp *sin = &sin_m;
	register struct rt_msghdr *rtm = &m_rtmsg.m_rtm;
	struct sockaddr_dl *sdl;
	u_char *ea;
	char *eaddr;

	if (info && strncmp(info, "pro", 3) )
		export_only = 1;
	getsocket();
	sin_m = blank_sin;
	sin->sin_addr.s_addr = inet_addr(host);
	if (sin->sin_addr.s_addr == -1) {
		if (!(hp = gethostbyname(host))) {
			fprintf(stderr, "arp: %s: ", host);
			herror((char *)NULL);
			return (1);
		}
		bcopy((char *)hp->h_addr, (char *)&sin->sin_addr,
		    sizeof sin->sin_addr);
	}
tryagain:
	if (rtmsg(RTM_GET) < 0) {
		perror(host);
		return (1);
	}
	sin = (struct sockaddr_inarp *)(rtm + 1);
	sdl = (struct sockaddr_dl *)(sin->sin_len + (char *)sin);
	if (sin->sin_addr.s_addr == sin_m.sin_addr.s_addr) {
		if (sdl->sdl_family == AF_LINK &&
		    (rtm->rtm_flags & RTF_LLINFO) &&
		    !(rtm->rtm_flags & RTF_GATEWAY)) switch (sdl->sdl_type) {
		case IFT_ETHER: case IFT_FDDI: case IFT_ISO88023:
		case IFT_ISO88024: case IFT_ISO88025:
			goto delete;
		}
	}
	if (sin_m.sin_other & SIN_PROXY) {
		fprintf(stderr, "delete: can't locate %s\n",host);
		return (1);
	} else {
		sin_m.sin_other = SIN_PROXY;
		goto tryagain;
	}
delete:
	if (sdl->sdl_family != AF_LINK) {
		printf("cannot locate %s\n", host);
		return (1);
	}
	if (rtmsg(RTM_DELETE) == 0)
		printf("%s (%s) deleted\n", host, inet_ntoa(sin->sin_addr));
}

/*
 * Dump the entire arp table
 */
dump(addr)
u_long addr;
{
	int mib[6];
	size_t needed;
	char *host, *malloc(), *lim, *buf, *next;
	struct rt_msghdr *rtm;
	struct sockaddr_inarp *sin;
	struct sockaddr_dl *sdl;
	extern int h_errno;
	struct hostent *hp;

		if (nflag == 0)
			hp = gethostbyaddr((caddr_t)&(sin->sin_addr),
			    sizeof sin->sin_addr, AF_INET);
		else
			hp = 0;
		if (hp)
			host = hp->h_name;
		else {
			host = "?";
			if (h_errno == TRY_AGAIN)
				nflag = 1;
		}
		printf("%s (%s) at ", host, inet_ntoa(sin->sin_addr));
		if (sdl->sdl_alen)
			ether_print(LLADDR(sdl));
		else
			printf("(incomplete)");
		if (rtm->rtm_rmx.rmx_expire == 0)
			printf(" permanent");
		if (sin->sin_other & SIN_PROXY)
			printf(" published (proxy only)");
		if (rtm->rtm_addrs & RTA_NETMASK) {
			sin = (struct sockaddr_inarp *)
				(sdl->sdl_len + (char *)sdl);
			if (sin->sin_addr.s_addr == 0xffffffff)
				printf(" published");
			if (sin->sin_len != 8)
				printf("(wierd)");
		}
		printf("\n");
	}
ether_print(cp)
	u_char *cp;
{
	printf("%x:%x:%x:%x:%x:%x", cp[0], cp[1], cp[2], cp[3], cp[4], cp[5]);
}

ether_aton(a, n)
	char *a;
	u_char *n;
{
	int i, o[6];

	i = sscanf(a, "%x:%x:%x:%x:%x:%x", &o[0], &o[1], &o[2],
					   &o[3], &o[4], &o[5]);
	if (i != 6) {
		fprintf(stderr, "arp: invalid Ethernet address '%s'\n", a);
		return (1);
	}
	for (i=0; i<6; i++)
		n[i] = o[i];
	return (0);
}

usage()
{
	printf("usage: arp hostname\n");
	printf("       arp -a [kernel] [kernel_memory]\n");
	printf("       arp -d hostname\n");
	printf("       arp -s hostname ether_addr [temp] [pub]\n");
	printf("       arp -f filename\n");
	exit(1);
}

rtmsg(cmd)
{
	static int seq;
	int rlen;
	register struct rt_msghdr *rtm = &m_rtmsg.m_rtm;
	register char *cp = m_rtmsg.m_space;
	register int l;

	errno = 0;
	if (cmd == RTM_DELETE)
		goto doit;
	bzero((char *)&m_rtmsg, sizeof(m_rtmsg));
	rtm->rtm_flags = flags;
	rtm->rtm_version = RTM_VERSION;

	switch (cmd) {
	default:
		fprintf(stderr, "arp: internal wrong cmd\n");
		exit(1);
	case RTM_ADD:
		rtm->rtm_addrs |= RTA_GATEWAY;
		rtm->rtm_rmx.rmx_expire = expire_time;
		rtm->rtm_inits = RTV_EXPIRE;
		rtm->rtm_flags |= (RTF_HOST | RTF_STATIC);
		sin_m.sin_other = 0;
		if (doing_proxy) {
			if (export_only)
				sin_m.sin_other = SIN_PROXY;
			else {
				rtm->rtm_addrs |= RTA_NETMASK;
				rtm->rtm_flags &= ~RTF_HOST;
			}
		}
		/* FALLTHROUGH */
	case RTM_GET:
		rtm->rtm_addrs |= RTA_DST;
	}
#define NEXTADDR(w, s) \
	if (rtm->rtm_addrs & (w)) { \
		bcopy((char *)&s, cp, sizeof(s)); cp += sizeof(s);}

	NEXTADDR(RTA_DST, sin_m);
	NEXTADDR(RTA_GATEWAY, sdl_m);
	NEXTADDR(RTA_NETMASK, so_mask);

	rtm->rtm_msglen = cp - (char *)&m_rtmsg;
doit:
	l = rtm->rtm_msglen;
	rtm->rtm_seq = ++seq;
	rtm->rtm_type = cmd;
	if ((rlen = write(s, (char *)&m_rtmsg, l)) < 0) {
		if (errno != ESRCH || cmd != RTM_DELETE) {
			perror("writing to routing socket");
			return (-1);
		}
	}
	do {
		l = read(s, (char *)&m_rtmsg, sizeof(m_rtmsg));
	} while (l > 0 && (rtm->rtm_seq != seq || rtm->rtm_pid != pid));
	if (l < 0)
		(void) fprintf(stderr, "arp: read from routing socket: %s\n",
		    strerror(errno));
	return (0);
}

quit(msg)
char *msg;
{
	fprintf(stderr, "%s\n", msg);
	exit(1);
}
Commit	Line	Data
e0dd6298	1	/*
726d166d KB	2	* Copyright (c) 1984, 1993
726d166d KB	3	* The Regents of the University of California. All rights reserved.
e0dd6298 KB	4	*
	5	* This code is derived from software contributed to Berkeley by
	6	* Sun Microsystems, Inc.
	7	*
32ce521f	8	* %sccs.include.redist.c%
e0dd6298 KB	9	*/
	10
	11	#ifndef lint
726d166d KB	12	static char copyright[] =
	13	"@(#) Copyright (c) 1984, 1993\n\
	14	The Regents of the University of California. All rights reserved.\n";
e0dd6298 KB	15	#endif /* not lint */
e0dd6298 KB	16
19b8bc00	17	#ifndef lint
b8d2f62b	18	static char sccsid[] = "@(#)arp.c 8.2 (Berkeley) %G%";
e0dd6298	19	#endif /* not lint */
19b8bc00 MK	20
	21	/*
	22	* arp - display, set, and delete arp table entries
	23	*/
	24
d2c7d54c	25	#include <sys/param.h>
d2c7d54c	26	#include <sys/file.h>
19b8bc00	27	#include <sys/socket.h>
e5eeeda9	28	#include <sys/sysctl.h>
d2c7d54c	29
19b8bc00	30	#include <net/if.h>
3d364b34 KS	31	#include <net/if_dl.h>
	32	#include <net/if_types.h>
	33	#include <net/route.h>
	34
	35	#include <netinet/in.h>
19b8bc00 MK	36	#include <netinet/if_ether.h>
19b8bc00 MK	37
80c4d34b RC	38	#include <arpa/inet.h>
80c4d34b RC	39
3d364b34	40	#include <netdb.h>
d2c7d54c KB	41	#include <errno.h>
d2c7d54c KB	42	#include <nlist.h>
bbf1e72a	43	#include <kvm.h>
d2c7d54c	44	#include <stdio.h>
7abf8d65	45	#include <paths.h>
0f62a41e	46
19b8bc00	47	extern int errno;
3d364b34	48	static int pid;
3d364b34 KS	49	static int nflag;
3d364b34 KS	50	static int s = -1;
19b8bc00 MK	51
19b8bc00 MK	52	main(argc, argv)
d2c7d54c	53	int argc;
19b8bc00 MK	54	char **argv;
19b8bc00 MK	55	{
d2c7d54c	56	int ch;
19b8bc00	57
3d364b34 KS	58	pid = getpid();
3d364b34 KS	59	while ((ch = getopt(argc, argv, "ands")) != EOF)
d2c7d54c	60	switch((char)ch) {
3d364b34 KS	61	case 'a':
3d364b34 KS	62	dump(0);
d2c7d54c	63	exit(0);
d2c7d54c	64	case 'd':
3d364b34	65	if (argc < 3 \|\| argc > 4)
d2c7d54c	66	usage();
3d364b34	67	delete(argv[2], argv[3]);
d2c7d54c	68	exit(0);
3d364b34 KS	69	case 'n':
	70	nflag = 1;
	71	continue;
d2c7d54c KB	72	case 's':
	73	if (argc < 4 \|\| argc > 7)
	74	usage();
	75	exit(set(argc-2, &argv[2]) ? 1 : 0);
d2c7d54c KB	76	case '?':
	77	default:
	78	usage();
	79	}
	80	if (argc != 2)
	81	usage();
	82	get(argv[1]);
	83	exit(0);
19b8bc00 MK	84	}
	85
	86	/*
	87	* Process a file to set standard arp entries
	88	*/
	89	file(name)
	90	char *name;
	91	{
	92	FILE *fp;
d2c7d54c	93	int i, retval;
9a642f1d	94	char line[100], arg[5][50], *args[5];
19b8bc00 MK	95
	96	if ((fp = fopen(name, "r")) == NULL) {
	97	fprintf(stderr, "arp: cannot open %s\n", name);
	98	exit(1);
	99	}
	100	args[0] = &arg[0][0];
	101	args[1] = &arg[1][0];
	102	args[2] = &arg[2][0];
	103	args[3] = &arg[3][0];
9a642f1d	104	args[4] = &arg[4][0];
59ead442	105	retval = 0;
19b8bc00	106	while(fgets(line, 100, fp) != NULL) {
59ead442 KM	107	i = sscanf(line, "%s %s %s %s %s", arg[0], arg[1], arg[2],
59ead442 KM	108	arg[3], arg[4]);
19b8bc00 MK	109	if (i < 2) {
19b8bc00 MK	110	fprintf(stderr, "arp: bad line: %s\n", line);
59ead442	111	retval = 1;
19b8bc00 MK	112	continue;
19b8bc00 MK	113	}
59ead442 KM	114	if (set(i, args))
59ead442 KM	115	retval = 1;
19b8bc00 MK	116	}
19b8bc00 MK	117	fclose(fp);
59ead442	118	return (retval);
19b8bc00 MK	119	}
19b8bc00 MK	120
3d364b34 KS	121	getsocket() {
	122	if (s < 0) {
	123	s = socket(PF_ROUTE, SOCK_RAW, 0);
	124	if (s < 0) {
	125	perror("arp: socket");
	126	exit(1);
	127	}
	128	}
	129	}
	130
	131	struct sockaddr_in so_mask = {8, 0, 0, { 0xffffffff}};
	132	struct sockaddr_inarp blank_sin = {sizeof(blank_sin), AF_INET }, sin_m;
	133	struct sockaddr_dl blank_sdl = {sizeof(blank_sdl), AF_LINK }, sdl_m;
	134	int expire_time, flags, export_only, doing_proxy, found_entry;
	135	struct {
	136	struct rt_msghdr m_rtm;
	137	char m_space[512];
	138	} m_rtmsg;
	139
19b8bc00 MK	140	/*
	141	* Set an individual arp entry
	142	*/
	143	set(argc, argv)
d2c7d54c	144	int argc;
19b8bc00 MK	145	char **argv;
19b8bc00 MK	146	{
19b8bc00	147	struct hostent *hp;
3d364b34 KS	148	register struct sockaddr_inarp *sin = &sin_m;
	149	register struct sockaddr_dl *sdl;
	150	register struct rt_msghdr *rtm = &(m_rtmsg.m_rtm);
b51f832f	151	u_char *ea;
19b8bc00 MK	152	char host = argv[0], eaddr = argv[1];
19b8bc00 MK	153
3d364b34	154	getsocket();
19b8bc00 MK	155	argc -= 2;
19b8bc00 MK	156	argv += 2;
3d364b34 KS	157	sdl_m = blank_sdl;
3d364b34 KS	158	sin_m = blank_sin;
6faa5fd4 MK	159	sin->sin_addr.s_addr = inet_addr(host);
6faa5fd4 MK	160	if (sin->sin_addr.s_addr == -1) {
2b2b1758 KB	161	if (!(hp = gethostbyname(host))) {
	162	fprintf(stderr, "arp: %s: ", host);
	163	herror((char *)NULL);
59ead442	164	return (1);
6faa5fd4 MK	165	}
	166	bcopy((char )hp->h_addr, (char )&sin->sin_addr,
	167	sizeof sin->sin_addr);
	168	}
3d364b34 KS	169	ea = (u_char *)LLADDR(&sdl_m);
	170	if (ether_aton(eaddr, ea) == 0)
	171	sdl_m.sdl_alen = 6;
	172	doing_proxy = flags = export_only = expire_time = 0;
6faa5fd4	173	while (argc-- > 0) {
3d364b34 KS	174	if (strncmp(argv[0], "temp", 4) == 0) {
	175	struct timeval time;
	176	gettimeofday(&time, 0);
	177	expire_time = time.tv_sec + 20 * 60;
	178	}
3ad154fa KB	179	else if (strncmp(argv[0], "pub", 3) == 0) {
3ad154fa KB	180	flags \|= RTF_ANNOUNCE;
3d364b34	181	doing_proxy = SIN_PROXY;
3ad154fa	182	} else if (strncmp(argv[0], "trail", 5) == 0) {
e270ebe8 KS	183	printf("%s: Sending trailers is no longer supported\n",
	184	host);
	185	}
19b8bc00 MK	186	argv++;
19b8bc00 MK	187	}
3d364b34 KS	188	tryagain:
3d364b34 KS	189	if (rtmsg(RTM_GET) < 0) {
19b8bc00	190	perror(host);
3d364b34	191	return (1);
19b8bc00	192	}
3d364b34 KS	193	sin = (struct sockaddr_inarp *)(rtm + 1);
	194	sdl = (struct sockaddr_dl )(sin->sin_len + (char )sin);
	195	if (sin->sin_addr.s_addr == sin_m.sin_addr.s_addr) {
	196	if (sdl->sdl_family == AF_LINK &&
	197	(rtm->rtm_flags & RTF_LLINFO) &&
	198	!(rtm->rtm_flags & RTF_GATEWAY)) switch (sdl->sdl_type) {
	199	case IFT_ETHER: case IFT_FDDI: case IFT_ISO88023:
	200	case IFT_ISO88024: case IFT_ISO88025:
	201	goto overwrite;
	202	}
	203	if (doing_proxy == 0) {
	204	printf("set: can only proxy for %s\n", host);
	205	return (1);
	206	}
	207	if (sin_m.sin_other & SIN_PROXY) {
	208	printf("set: proxy entry exists for non 802 device\n");
	209	return(1);
	210	}
	211	sin_m.sin_other = SIN_PROXY;
	212	export_only = 1;
	213	goto tryagain;
	214	}
	215	overwrite:
	216	if (sdl->sdl_family != AF_LINK) {
	217	printf("cannot intuit interface index and type for %s\n", host);
	218	return (1);
	219	}
	220	sdl_m.sdl_type = sdl->sdl_type;
	221	sdl_m.sdl_index = sdl->sdl_index;
	222	return (rtmsg(RTM_ADD));
19b8bc00 MK	223	}
19b8bc00 MK	224
19b8bc00 MK	225	/*
	226	* Display an individual arp entry
	227	*/
	228	get(host)
	229	char *host;
	230	{
19b8bc00	231	struct hostent *hp;
3d364b34	232	struct sockaddr_inarp *sin = &sin_m;
b51f832f	233	u_char *ea;
19b8bc00	234
3d364b34	235	sin_m = blank_sin;
6faa5fd4 MK	236	sin->sin_addr.s_addr = inet_addr(host);
6faa5fd4 MK	237	if (sin->sin_addr.s_addr == -1) {
2b2b1758 KB	238	if (!(hp = gethostbyname(host))) {
	239	fprintf(stderr, "arp: %s: ", host);
	240	herror((char *)NULL);
6faa5fd4 MK	241	exit(1);
	242	}
	243	bcopy((char )hp->h_addr, (char )&sin->sin_addr,
	244	sizeof sin->sin_addr);
	245	}
3d364b34 KS	246	dump(sin->sin_addr.s_addr);
	247	if (found_entry == 0) {
	248	printf("%s (%s) -- no entry\n",
	249	host, inet_ntoa(sin->sin_addr));
d2c7d54c KB	250	exit(1);
d2c7d54c KB	251	}
19b8bc00 MK	252	}
	253
	254	/*
	255	* Delete an arp entry
	256	*/
3d364b34	257	delete(host, info)
19b8bc00	258	char *host;
3d364b34	259	char *info;
19b8bc00	260	{
19b8bc00	261	struct hostent *hp;
3d364b34 KS	262	register struct sockaddr_inarp *sin = &sin_m;
	263	register struct rt_msghdr *rtm = &m_rtmsg.m_rtm;
	264	struct sockaddr_dl *sdl;
	265	u_char *ea;
	266	char *eaddr;
19b8bc00	267
3d364b34 KS	268	if (info && strncmp(info, "pro", 3) )
	269	export_only = 1;
	270	getsocket();
	271	sin_m = blank_sin;
6faa5fd4 MK	272	sin->sin_addr.s_addr = inet_addr(host);
6faa5fd4 MK	273	if (sin->sin_addr.s_addr == -1) {
2b2b1758 KB	274	if (!(hp = gethostbyname(host))) {
	275	fprintf(stderr, "arp: %s: ", host);
	276	herror((char *)NULL);
3d364b34	277	return (1);
6faa5fd4 MK	278	}
	279	bcopy((char )hp->h_addr, (char )&sin->sin_addr,
	280	sizeof sin->sin_addr);
	281	}
3d364b34 KS	282	tryagain:
	283	if (rtmsg(RTM_GET) < 0) {
	284	perror(host);
	285	return (1);
d2c7d54c	286	}
3d364b34 KS	287	sin = (struct sockaddr_inarp *)(rtm + 1);
	288	sdl = (struct sockaddr_dl )(sin->sin_len + (char )sin);
	289	if (sin->sin_addr.s_addr == sin_m.sin_addr.s_addr) {
	290	if (sdl->sdl_family == AF_LINK &&
	291	(rtm->rtm_flags & RTF_LLINFO) &&
	292	!(rtm->rtm_flags & RTF_GATEWAY)) switch (sdl->sdl_type) {
	293	case IFT_ETHER: case IFT_FDDI: case IFT_ISO88023:
	294	case IFT_ISO88024: case IFT_ISO88025:
	295	goto delete;
	296	}
19b8bc00	297	}
3d364b34 KS	298	if (sin_m.sin_other & SIN_PROXY) {
	299	fprintf(stderr, "delete: can't locate %s\n",host);
	300	return (1);
	301	} else {
	302	sin_m.sin_other = SIN_PROXY;
	303	goto tryagain;
	304	}
	305	delete:
	306	if (sdl->sdl_family != AF_LINK) {
	307	printf("cannot locate %s\n", host);
	308	return (1);
	309	}
	310	if (rtmsg(RTM_DELETE) == 0)
	311	printf("%s (%s) deleted\n", host, inet_ntoa(sin->sin_addr));
19b8bc00 MK	312	}
19b8bc00 MK	313
19b8bc00 MK	314	/*
	315	* Dump the entire arp table
	316	*/
3d364b34 KS	317	dump(addr)
3d364b34 KS	318	u_long addr;
19b8bc00	319	{
e5eeeda9 KM	320	int mib[6];
e5eeeda9 KM	321	size_t needed;
3d364b34 KS	322	char host, malloc(), lim, buf, *next;
	323	struct rt_msghdr *rtm;
	324	struct sockaddr_inarp *sin;
	325	struct sockaddr_dl *sdl;
d2c7d54c	326	extern int h_errno;
19b8bc00	327	struct hostent *hp;
19b8bc00	328
3d364b34 KS	329	if (nflag == 0)
	330	hp = gethostbyaddr((caddr_t)&(sin->sin_addr),
	331	sizeof sin->sin_addr, AF_INET);
6faa5fd4 MK	332	else
6faa5fd4 MK	333	hp = 0;
19b8bc00 MK	334	if (hp)
19b8bc00 MK	335	host = hp->h_name;
6faa5fd4	336	else {
19b8bc00	337	host = "?";
6faa5fd4	338	if (h_errno == TRY_AGAIN)
3d364b34	339	nflag = 1;
6faa5fd4	340	}
3d364b34 KS	341	printf("%s (%s) at ", host, inet_ntoa(sin->sin_addr));
	342	if (sdl->sdl_alen)
	343	ether_print(LLADDR(sdl));
19b8bc00 MK	344	else
19b8bc00 MK	345	printf("(incomplete)");
3d364b34	346	if (rtm->rtm_rmx.rmx_expire == 0)
d2c7d54c	347	printf(" permanent");
3d364b34 KS	348	if (sin->sin_other & SIN_PROXY)
3d364b34 KS	349	printf(" published (proxy only)");
3d364b34 KS	350	if (rtm->rtm_addrs & RTA_NETMASK) {
	351	sin = (struct sockaddr_inarp *)
	352	(sdl->sdl_len + (char *)sdl);
	353	if (sin->sin_addr.s_addr == 0xffffffff)
	354	printf(" published");
	355	if (sin->sin_len != 8)
	356	printf("(wierd)");
	357	}
19b8bc00 MK	358	printf("\n");
19b8bc00 MK	359	}
b51f832f MK	360	ether_print(cp)
b51f832f MK	361	u_char *cp;
19b8bc00	362	{
19b8bc00 MK	363	printf("%x:%x:%x:%x:%x:%x", cp[0], cp[1], cp[2], cp[3], cp[4], cp[5]);
	364	}
	365
	366	ether_aton(a, n)
	367	char *a;
b51f832f	368	u_char *n;
19b8bc00 MK	369	{
	370	int i, o[6];
	371
	372	i = sscanf(a, "%x:%x:%x:%x:%x:%x", &o[0], &o[1], &o[2],
	373	&o[3], &o[4], &o[5]);
	374	if (i != 6) {
	375	fprintf(stderr, "arp: invalid Ethernet address '%s'\n", a);
	376	return (1);
	377	}
	378	for (i=0; i<6; i++)
b51f832f	379	n[i] = o[i];
19b8bc00 MK	380	return (0);
	381	}
	382
	383	usage()
	384	{
d2c7d54c	385	printf("usage: arp hostname\n");
7abf8d65	386	printf(" arp -a [kernel] [kernel_memory]\n");
19b8bc00	387	printf(" arp -d hostname\n");
e270ebe8	388	printf(" arp -s hostname ether_addr [temp] [pub]\n");
19b8bc00	389	printf(" arp -f filename\n");
d2c7d54c	390	exit(1);
19b8bc00	391	}
3d364b34 KS	392
	393	rtmsg(cmd)
	394	{
	395	static int seq;
	396	int rlen;
	397	register struct rt_msghdr *rtm = &m_rtmsg.m_rtm;
	398	register char *cp = m_rtmsg.m_space;
	399	register int l;
	400
	401	errno = 0;
	402	if (cmd == RTM_DELETE)
	403	goto doit;
	404	bzero((char *)&m_rtmsg, sizeof(m_rtmsg));
	405	rtm->rtm_flags = flags;
	406	rtm->rtm_version = RTM_VERSION;
	407
	408	switch (cmd) {
	409	default:
	410	fprintf(stderr, "arp: internal wrong cmd\n");
	411	exit(1);
	412	case RTM_ADD:
	413	rtm->rtm_addrs \|= RTA_GATEWAY;
	414	rtm->rtm_rmx.rmx_expire = expire_time;
	415	rtm->rtm_inits = RTV_EXPIRE;
4937f90f	416	rtm->rtm_flags \|= (RTF_HOST \| RTF_STATIC);
3d364b34 KS	417	sin_m.sin_other = 0;
	418	if (doing_proxy) {
	419	if (export_only)
	420	sin_m.sin_other = SIN_PROXY;
	421	else {
	422	rtm->rtm_addrs \|= RTA_NETMASK;
	423	rtm->rtm_flags &= ~RTF_HOST;
	424	}
	425	}
b8d2f62b	426	/* FALLTHROUGH */
3d364b34 KS	427	case RTM_GET:
	428	rtm->rtm_addrs \|= RTA_DST;
	429	}
	430	#define NEXTADDR(w, s) \
	431	if (rtm->rtm_addrs & (w)) { \
	432	bcopy((char *)&s, cp, sizeof(s)); cp += sizeof(s);}
	433
	434	NEXTADDR(RTA_DST, sin_m);
	435	NEXTADDR(RTA_GATEWAY, sdl_m);
	436	NEXTADDR(RTA_NETMASK, so_mask);
	437
	438	rtm->rtm_msglen = cp - (char *)&m_rtmsg;
	439	doit:
	440	l = rtm->rtm_msglen;
	441	rtm->rtm_seq = ++seq;
	442	rtm->rtm_type = cmd;
	443	if ((rlen = write(s, (char *)&m_rtmsg, l)) < 0) {
	444	if (errno != ESRCH \|\| cmd != RTM_DELETE) {
	445	perror("writing to routing socket");
	446	return (-1);
	447	}
	448	}
	449	do {
	450	l = read(s, (char *)&m_rtmsg, sizeof(m_rtmsg));
	451	} while (l > 0 && (rtm->rtm_seq != seq \|\| rtm->rtm_pid != pid));
	452	if (l < 0)
	453	(void) fprintf(stderr, "arp: read from routing socket: %s\n",
	454	strerror(errno));
	455	return (0);
	456	}
	457
	458	quit(msg)
	459	char *msg;
	460	{
	461	fprintf(stderr, "%s\n", msg);
	462	exit(1);
	463	}