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