libexec/bootpd/lookup.c

   1 /*
   2  * lookup.c - Lookup IP address, HW address, netmask
   3  *
   4  * $FreeBSD: src/libexec/bootpd/lookup.c,v 1.7 1999/08/28 00:09:19 peter Exp $
   5  */
   6
   7 #include <sys/types.h>
   8 #include <sys/socket.h>
   9
  10 #include <sys/time.h>   /* for struct timeval in net/if.h */
  11 #include <net/if.h>
  12 #include <netinet/in.h>
  13
  14 #ifdef  ETC_ETHERS
  15 #include <net/ethernet.h>
  16 extern int ether_hostton();
  17 #endif
  18
  19 #include <netdb.h>
  20 #include <syslog.h>
  21
  22 #ifndef USE_BFUNCS
  23 #include <memory.h>
  24 /* Yes, memcpy is OK here (no overlapped copies). */
  25 #define bcopy(a,b,c)    memcpy(b,a,c)
  26 #endif
  27
  28 #include "bootp.h"
  29 #include "lookup.h"
  30 #include "report.h"
  31
  32 /*
  33  * Lookup an Ethernet address and return it.
  34  * Return NULL if addr not found.
  35  */
  36 u_char *
  37 lookup_hwa(char *hostname, int htype)
  38 {
  39         switch (htype) {
  40
  41                 /* XXX - How is this done on other systems? -gwr */
  42 #ifdef  ETC_ETHERS
  43         case HTYPE_ETHERNET:
  44         case HTYPE_IEEE802:
  45                 {
  46                         static struct ether_addr ea;
  47                         /* This does a lookup in /etc/ethers */
  48                         if (ether_hostton(hostname, &ea)) {
  49                                 report(LOG_ERR, "no HW addr for host \"%s\"",
  50                                            hostname);
  51                                 return NULL;
  52                         }
  53                         return (u_char *) & ea;
  54                 }
  55 #endif /* ETC_ETHERS */
  56
  57         default:
  58                 report(LOG_ERR, "no lookup for HW addr type %d", htype);
  59         }                                                       /* switch */
  60
  61         /* If the system can't do it, just return an error. */
  62         return NULL;
  63 }
  64
  65
  66 /*
  67  * Lookup an IP address.
  68  * Return non-zero on failure.
  69  */
  70 int
  71 lookup_ipa(char *hostname, u_int32 *result)
  72 {
  73         struct hostent *hp;
  74         hp = gethostbyname(hostname);
  75         if (!hp)
  76                 return -1;
  77         bcopy(hp->h_addr, result, sizeof(*result));
  78         return 0;
  79 }
  80
  81
  82 /*
  83  * Lookup a netmask
  84  * addr and result are both in network order. Return non-zero on failure.
  85  *
  86  * XXX - This is OK as a default, but to really make this automatic,
  87  * we would need to get the subnet mask from the ether interface.
  88  * If this is wrong, specify the correct value in the bootptab.
  89  */
  90 int
  91 lookup_netmask(u_int32 addr, u_int32 *result)
  92 {
  93         int32 m, a;
  94
  95         a = ntohl(addr);
  96         m = 0;
  97
  98         if (IN_CLASSA(a))
  99                 m = IN_CLASSA_NET;
 100
 101         if (IN_CLASSB(a))
 102                 m = IN_CLASSB_NET;
 103
 104         if (IN_CLASSC(a))
 105                 m = IN_CLASSC_NET;
 106
 107         if (!m)
 108                 return -1;
 109         *result = htonl(m);
 110         return 0;
 111 }