1/*	$FreeBSD$	*/
2
3/*
4 * Based upon 4.4BSD's /usr/sbin/arp
5 */
6#include <sys/param.h>
7#include <sys/file.h>
8#include <sys/socket.h>
9#include <sys/sysctl.h>
10#include <net/if.h>
11#if __FreeBSD_version >= 300000
12# include <net/if_var.h>
13#endif
14#include <net/if_dl.h>
15#include <net/if_types.h>
16#if defined(__FreeBSD__)
17# include "radix_ipf.h"
18#endif
19#ifndef __osf__
20# include <net/route.h>
21#endif
22#include <netinet/in.h>
23#include <netinet/if_ether.h>
24#include <arpa/inet.h>
25#include <netinet/in.h>
26#include <netinet/in_systm.h>
27#include <netinet/ip.h>
28#include <netinet/ip_var.h>
29#include <netinet/tcp.h>
30#include <unistd.h>
31#include <string.h>
32#include <stdlib.h>
33#include <netdb.h>
34#include <errno.h>
35#include <nlist.h>
36#include <stdio.h>
37#include "ipsend.h"
38#include "iplang/iplang.h"
39
40
41/*
42 * lookup host and return
43 * its IP address in address
44 * (4 bytes)
45 */
46int	resolve(host, address)
47char	*host, *address;
48{
49        struct	hostent	*hp;
50        u_long	add;
51
52	add = inet_addr(host);
53	if (add == -1)
54	    {
55		if (!(hp = gethostbyname(host)))
56		    {
57			fprintf(stderr, "unknown host: %s\n", host);
58			return -1;
59		    }
60		bcopy((char *)hp->h_addr, (char *)address, 4);
61		return 0;
62	}
63	bcopy((char*)&add, address, 4);
64	return 0;
65}
66
67
68int	arp(addr, eaddr)
69char	*addr, *eaddr;
70{
71	int	mib[6];
72	size_t	needed;
73	char	*lim, *buf, *next;
74	struct	rt_msghdr	*rtm;
75	struct	sockaddr_inarp	*sin;
76	struct	sockaddr_dl	*sdl;
77
78#ifdef	IPSEND
79	if (arp_getipv4(addr, ether) == 0)
80		return 0;
81#endif
82
83	if (!addr)
84		return -1;
85
86	mib[0] = CTL_NET;
87	mib[1] = PF_ROUTE;
88	mib[2] = 0;
89	mib[3] = AF_INET;
90	mib[4] = NET_RT_FLAGS;
91#ifdef RTF_LLINFO
92	mib[5] = RTF_LLINFO;
93#else
94	mib[5] = 0;
95#endif
96
97	if (sysctl(mib, 6, NULL, &needed, NULL, 0) == -1)
98	    {
99		perror("route-sysctl-estimate");
100		exit(-1);
101	    }
102	if ((buf = malloc(needed)) == NULL)
103	    {
104		perror("malloc");
105		exit(-1);
106	    }
107	if (sysctl(mib, 6, buf, &needed, NULL, 0) == -1)
108	    {
109		perror("actual retrieval of routing table");
110		exit(-1);
111	    }
112	lim = buf + needed;
113	for (next = buf; next < lim; next += rtm->rtm_msglen)
114	    {
115		rtm = (struct rt_msghdr *)next;
116		sin = (struct sockaddr_inarp *)(rtm + 1);
117		sdl = (struct sockaddr_dl *)(sin + 1);
118		if (!bcmp(addr, (char *)&sin->sin_addr,
119			  sizeof(struct in_addr)))
120		    {
121			bcopy(LLADDR(sdl), eaddr, sdl->sdl_alen);
122			return 0;
123		    }
124	    }
125	return -1;
126}
127