/*
 * lookup.c - Lookup IP address, HW address, netmask
 */

#include <sys/types.h>
#include <sys/socket.h>

#include <sys/time.h>   /* for struct timeval in net/if.h */
#include <net/if.h>
#include <netinet/in.h>

#ifdef  ETC_ETHERS
#include <net/ethernet.h>
#endif

#include <netdb.h>
#include <strings.h>
#include <syslog.h>

#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(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(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.
 *
 * Both arguments are in network order
 */
int
lookup_netmask(u_int32 addr, 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:
 */