be45f4d02a
using a #define to turn one into the other, this is pointless and causes more portability issues than it solves (admittedly, in the year 1702 when this code was written the opposite may have been the case).
124 lines
2.2 KiB
C
124 lines
2.2 KiB
C
/* $NetBSD: lookup.c,v 1.6 2007/05/27 16:31:42 tls Exp $ */
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#include <sys/cdefs.h>
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#ifndef lint
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__RCSID("$NetBSD: lookup.c,v 1.6 2007/05/27 16:31:42 tls Exp $");
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#endif
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/*
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* lookup.c - Lookup IP address, HW address, netmask
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*/
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <net/if.h>
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#include <netinet/in.h>
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#ifdef ETC_ETHERS
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#include <net/if_ether.h>
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#endif
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#include <netdb.h>
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#include <syslog.h>
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#include <strings.h>
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#include "bootp.h"
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#include "lookup.h"
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#include "report.h"
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/*
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* Lookup an Ethernet address and return it.
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* Return NULL if addr not found.
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*/
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u_char *
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lookup_hwa(char *hostname, int htype)
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{
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switch (htype) {
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/* XXX - How is this done on other systems? -gwr */
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#ifdef ETC_ETHERS
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case HTYPE_ETHERNET:
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case HTYPE_IEEE802:
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{
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static struct ether_addr ea;
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/* This does a lookup in /etc/ethers */
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if (ether_hostton(hostname, &ea)) {
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report(LOG_ERR, "no HW addr for host \"%s\"",
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hostname);
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return (u_char *) 0;
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}
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return (u_char *) & ea;
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}
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#endif /* ETC_ETHERS */
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default:
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report(LOG_ERR, "no lookup for HW addr type %d", htype);
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} /* switch */
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/* If the system can't do it, just return an error. */
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return (u_char *) 0;
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}
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/*
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* Lookup an IP address.
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* Return non-zero on failure.
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*/
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int
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lookup_ipa(char *hostname, u_int32 *result)
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{
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struct hostent *hp;
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hp = gethostbyname(hostname);
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if (!hp)
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return -1;
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bcopy(hp->h_addr, result, sizeof(*result));
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return 0;
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}
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/*
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* Lookup a netmask
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* Return non-zero on failure.
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*
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* XXX - This is OK as a default, but to really make this automatic,
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* we would need to get the subnet mask from the ether interface.
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* If this is wrong, specify the correct value in the bootptab.
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*
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* Both inputs are in network order.
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*/
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int
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lookup_netmask(u_int32 addr, u_int32 *result)
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{
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int32 m, a;
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a = ntohl(addr);
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m = 0;
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if (IN_CLASSA(a))
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m = IN_CLASSA_NET;
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if (IN_CLASSB(a))
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m = IN_CLASSB_NET;
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if (IN_CLASSC(a))
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m = IN_CLASSC_NET;
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if (!m)
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return -1;
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*result = htonl(m);
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return 0;
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}
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/*
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* Local Variables:
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* tab-width: 4
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* c-indent-level: 4
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* c-argdecl-indent: 4
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* c-continued-statement-offset: 4
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* c-continued-brace-offset: -4
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* c-label-offset: -4
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* c-brace-offset: 0
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* End:
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*/
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