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lookup.c revision 1.4 
      1 /*	$NetBSD: lookup.c,v 1.4 1998/03/14 04:39:54 lukem Exp $	*/
      2 
      3 #include <sys/cdefs.h>
      4 #ifndef lint
      5 __RCSID("$NetBSD: lookup.c,v 1.4 1998/03/14 04:39:54 lukem Exp $");
      6 #endif
      7 
      8 /*
      9  * lookup.c - Lookup IP address, HW address, netmask
     10  */
     11 
     12 #include <sys/types.h>
     13 #include <sys/socket.h>
     14 
     15 #include <net/if.h>
     16 #include <netinet/in.h>
     17 
     18 #ifdef	ETC_ETHERS
     19 #include <net/if_ether.h>
     20 #endif
     21 
     22 #include <netdb.h>
     23 #include <syslog.h>
     24 
     25 #ifndef USE_BFUNCS
     26 #include <memory.h>
     27 /* Yes, memcpy is OK here (no overlapped copies). */
     28 #define bcopy(a,b,c)    memcpy(b,a,c)
     29 #endif
     30 
     31 #include "bootp.h"
     32 #include "lookup.h"
     33 #include "report.h"
     34 
     35 /*
     36  * Lookup an Ethernet address and return it.
     37  * Return NULL if addr not found.
     38  */
     39 u_char *
     40 lookup_hwa(hostname, htype)
     41 	char *hostname;
     42 	int htype;
     43 {
     44 	switch (htype) {
     45 
     46 		/* XXX - How is this done on other systems? -gwr */
     47 #ifdef	ETC_ETHERS
     48 	case HTYPE_ETHERNET:
     49 	case HTYPE_IEEE802:
     50 		{
     51 			static struct ether_addr ea;
     52 			/* This does a lookup in /etc/ethers */
     53 			if (ether_hostton(hostname, &ea)) {
     54 				report(LOG_ERR, "no HW addr for host \"%s\"",
     55 					   hostname);
     56 				return (u_char *) 0;
     57 			}
     58 			return (u_char *) & ea;
     59 		}
     60 #endif /* ETC_ETHERS */
     61 
     62 	default:
     63 		report(LOG_ERR, "no lookup for HW addr type %d", htype);
     64 	}							/* switch */
     65 
     66 	/* If the system can't do it, just return an error. */
     67 	return (u_char *) 0;
     68 }
     69 
     70 
     71 /*
     72  * Lookup an IP address.
     73  * Return non-zero on failure.
     74  */
     75 int
     76 lookup_ipa(hostname, result)
     77 	char *hostname;
     78 	u_int32 *result;
     79 {
     80 	struct hostent *hp;
     81 	hp = gethostbyname(hostname);
     82 	if (!hp)
     83 		return -1;
     84 	bcopy(hp->h_addr, result, sizeof(*result));
     85 	return 0;
     86 }
     87 
     88 
     89 /*
     90  * Lookup a netmask
     91  * Return non-zero on failure.
     92  *
     93  * XXX - This is OK as a default, but to really make this automatic,
     94  * we would need to get the subnet mask from the ether interface.
     95  * If this is wrong, specify the correct value in the bootptab.
     96  */
     97 int
     98 lookup_netmask(addr, result)
     99 	u_int32 addr;				/* both in network order */
    100 	u_int32 *result;
    101 {
    102 	int32 m, a;
    103 
    104 	a = ntohl(addr);
    105 	m = 0;
    106 
    107 	if (IN_CLASSA(a))
    108 		m = IN_CLASSA_NET;
    109 
    110 	if (IN_CLASSB(a))
    111 		m = IN_CLASSB_NET;
    112 
    113 	if (IN_CLASSC(a))
    114 		m = IN_CLASSC_NET;
    115 
    116 	if (!m)
    117 		return -1;
    118 	*result = htonl(m);
    119 	return 0;
    120 }
    121 
    122 /*
    123  * Local Variables:
    124  * tab-width: 4
    125  * c-indent-level: 4
    126  * c-argdecl-indent: 4
    127  * c-continued-statement-offset: 4
    128  * c-continued-brace-offset: -4
    129  * c-label-offset: -4
    130  * c-brace-offset: 0
    131  * End:
    132  */
    133