106 lines
2.1 KiB
C
106 lines
2.1 KiB
C
/* $NetBSD: 44arp.c,v 1.5 1997/10/30 16:10:27 mrg Exp $ */
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/*
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* Based upon 4.4BSD's /usr/sbin/arp
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*/
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#include <unistd.h>
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#include <string.h>
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#include <stdlib.h>
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#include <sys/param.h>
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#include <sys/file.h>
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#include <sys/socket.h>
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#include <sys/sysctl.h>
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#include <net/if.h>
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#include <net/if_dl.h>
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#include <net/if_types.h>
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#include <net/route.h>
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#include <netinet/in.h>
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#include <netinet/if_ether.h>
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#include <arpa/inet.h>
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#include <netdb.h>
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#include <errno.h>
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#include <nlist.h>
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#include <stdio.h>
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#include <netinet/in.h>
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#include <netinet/ip_var.h>
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#include <netinet/tcp.h>
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#if __FreeBSD_version >= 300000
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# include <net/if_var.h>
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#endif
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#include "ipsend.h"
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/*
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* lookup host and return
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* its IP address in address
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* (4 bytes)
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*/
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int resolve(host, address)
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char *host, *address;
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{
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struct hostent *hp;
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u_long add;
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add = inet_addr(host);
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if (add == -1)
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{
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if (!(hp = gethostbyname(host)))
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{
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fprintf(stderr, "unknown host: %s\n", host);
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return -1;
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}
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bcopy((char *)hp->h_addr, (char *)address, 4);
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return 0;
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}
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bcopy((char*)&add, address, 4);
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return 0;
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}
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int arp(addr, eaddr)
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char *addr, *eaddr;
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{
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int mib[6];
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size_t needed;
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char *lim, *buf, *next;
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struct rt_msghdr *rtm;
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struct sockaddr_inarp *sin;
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struct sockaddr_dl *sdl;
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mib[0] = CTL_NET;
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mib[1] = PF_ROUTE;
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mib[2] = 0;
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mib[3] = AF_INET;
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mib[4] = NET_RT_FLAGS;
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mib[5] = RTF_LLINFO;
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if (sysctl(mib, 6, NULL, &needed, NULL, 0) == -1)
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{
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perror("route-sysctl-estimate");
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exit(-1);
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}
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if ((buf = malloc(needed)) == NULL)
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{
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perror("malloc");
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exit(-1);
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}
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if (sysctl(mib, 6, buf, &needed, NULL, 0) == -1)
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{
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perror("actual retrieval of routing table");
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exit(-1);
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}
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lim = buf + needed;
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for (next = buf; next < lim; next += rtm->rtm_msglen)
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{
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rtm = (struct rt_msghdr *)next;
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sin = (struct sockaddr_inarp *)(rtm + 1);
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sdl = (struct sockaddr_dl *)(sin + 1);
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if (addr && !bcmp(addr, (char *)&sin->sin_addr,
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sizeof(struct in_addr)))
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{
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bcopy(LLADDR(sdl), eaddr, sdl->sdl_alen);
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return 0;
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}
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}
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return -1;
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}
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