]> CyberLeo.Net >> Repos - FreeBSD/releng/9.2.git/blob - contrib/ipfilter/ipsend/44arp.c
- Copy stable/9 to releng/9.2 as part of the 9.2-RELEASE cycle.
[FreeBSD/releng/9.2.git] / contrib / ipfilter / ipsend / 44arp.c
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  */
46 int     resolve(host, address)
47 char    *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
68 int     arp(addr, eaddr)
69 char    *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 }