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