1/* $FreeBSD: head/contrib/ipfilter/ipsend/44arp.c 186119 2008-12-15 06:10:57Z qingli $ */
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}