109 lines
2.4 KiB
C
109 lines
2.4 KiB
C
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/*
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* rarpd support routines
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*
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* Written by Bill Paul <wpaul@ctr.columbia.edu>
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* Center for Telecommunications Research
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* Columbia University, New York City
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*
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* This code is public domain. There is no copyright. There are no
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* distribution or usage restrictions. There are no strings attached.
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*
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* Have a party.
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*
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* $Id$
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*/
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#include <stdio.h>
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#ifndef _PATH_ETHERS
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#define _PATH_ETHERS "/etc/ethers"
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#endif
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/*
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* This should be defined in <netinet/if_ether.h> but it isn't.
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*/
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struct ether_addr {
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unsigned char octet[6];
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};
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/*
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* Parse a string of text containing an ethernet address and hostname
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* and separate it into its component parts.
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*/
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int ether_line(l, e, hostname)
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char *l;
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struct ether_addr *e;
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char *hostname;
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{
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int i, o[6];
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i = sscanf(l, "%x:%x:%x:%x:%x:%x %s", &o[0], &o[1], &o[2],
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&o[3], &o[4], &o[5],
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hostname);
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if (i != 7)
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return (-1);
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for (i=0; i<6; i++)
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e->octet[i] = o[i];
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return (0);
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}
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/*
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* Map an ethernet address to a hostname. Use either /etc/ethers or
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* NIS/YP.
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*/
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int ether_ntohost(hostname, e)
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char *hostname;
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struct ether_addr *e;
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{
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FILE *fp;
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static char buf[BUFSIZ];
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static struct ether_addr local_ether;
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static char *local_host;
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static char *result;
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int resultlen, i;
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extern int yp_get_default_domain();
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extern int yp_match();
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static char *yp_domain;
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static char ether_a[BUFSIZ];
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if ((fp = fopen(_PATH_ETHERS, "r")) == NULL) {
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perror(_PATH_ETHERS);
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return (-1);
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}
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while (fgets(buf,BUFSIZ,fp)) {
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if (buf[0] == '+') {
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if (yp_get_default_domain(&yp_domain))
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return(-1);
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sprintf(ether_a,"%x:%x:%x:%x:%x:%x",
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e->octet[0], e->octet[1],
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e->octet[2], e->octet[3],
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e->octet[4], e->octet[5]);
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if (yp_match(yp_domain, "ethers.byaddr", ether_a,
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strlen(ether_a),&result, &resultlen))
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return(-1);
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if (ether_line(result, &local_ether,
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&local_host) == 0) {
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strcpy(hostname, (char *)&local_host);
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return(0);
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} else
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return(-1);
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}
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if (ether_line(&buf, &local_ether, &local_host) == 0) {
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for (i = 0; i < 6; i++)
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if (local_ether.octet[i] != e->octet[i])
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goto nomatch;
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/* We have a match */
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strcpy(hostname, (char *)&local_host);
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fclose(fp);
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return(0);
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}
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nomatch:
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}
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return (-1);
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}
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