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/*
* lookup.c - Lookup IP address, HW address, netmask
*/
#include <sys/types.h>
#include <sys/socket.h>
#include <net/if.h>
#include <netinet/in.h>
#ifdef ETC_ETHERS
#include <netinet/if_ether.h>
extern int ether_hostton();
#endif
#include <netdb.h>
#include <syslog.h>
#ifndef USE_BFUNCS
#include <memory.h>
/* Yes, memcpy is OK here (no overlapped copies). */
#define bcopy(a,b,c) memcpy(b,a,c)
#endif
#include "bootp.h"
#include "lookup.h"
#include "report.h"
/*
* Lookup an Ethernet address and return it.
* Return NULL if addr not found.
*/
u_char *
lookup_hwa(hostname, htype)
char *hostname;
int htype;
{
switch (htype) {
/* XXX - How is this done on other systems? -gwr */
#ifdef ETC_ETHERS
case HTYPE_ETHERNET:
case HTYPE_IEEE802:
{
static struct ether_addr ea;
/* This does a lookup in /etc/ethers */
if (ether_hostton(hostname, &ea)) {
report(LOG_ERR, "no HW addr for host \"%s\"",
hostname);
return (u_char *) 0;
}
return (u_char *) & ea;
}
#endif /* ETC_ETHERS */
default:
report(LOG_ERR, "no lookup for HW addr type %d", htype);
} /* switch */
/* If the system can't do it, just return an error. */
return (u_char *) 0;
}
/*
* Lookup an IP address.
* Return non-zero on failure.
*/
int
lookup_ipa(hostname, result)
char *hostname;
u_int32 *result;
{
struct hostent *hp;
hp = gethostbyname(hostname);
if (!hp)
return -1;
bcopy(hp->h_addr, result, sizeof(*result));
return 0;
}
/*
* Lookup a netmask
* Return non-zero on failure.
*
* XXX - This is OK as a default, but to really make this automatic,
* we would need to get the subnet mask from the ether interface.
* If this is wrong, specify the correct value in the bootptab.
*/
int
lookup_netmask(addr, result)
u_int32 addr; /* both in network order */
u_int32 *result;
{
int32 m, a;
a = ntohl(addr);
m = 0;
if (IN_CLASSA(a))
m = IN_CLASSA_NET;
if (IN_CLASSB(a))
m = IN_CLASSB_NET;
if (IN_CLASSC(a))
m = IN_CLASSC_NET;
if (!m)
return -1;
*result = htonl(m);
return 0;
}
/*
* Local Variables:
* tab-width: 4
* c-indent-level: 4
* c-argdecl-indent: 4
* c-continued-statement-offset: 4
* c-continued-brace-offset: -4
* c-label-offset: -4
* c-brace-offset: 0
* End:
*/
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