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  * $DragonFly: src/libexec/bootpd/lookup.c,v 1.2 2003/06/17 04:27:07 dillon Exp $
   6  */
   7
   8 #include <sys/types.h>
   9 #include <sys/socket.h>
  10
  11 #include <sys/time.h>   /* for struct timeval in net/if.h */
  12 #include <net/if.h>
  13 #include <netinet/in.h>
  14
  15 #ifdef  ETC_ETHERS
  16 #include <net/ethernet.h>
  17 extern int ether_hostton();
  18 #endif
  19
  20 #include <netdb.h>
  21 #include <syslog.h>
  22
  23 #ifndef USE_BFUNCS
  24 #include <memory.h>
  25 /* Yes, memcpy is OK here (no overlapped copies). */
  26 #define bcopy(a,b,c)    memcpy(b,a,c)
  27 #endif
  28
  29 #include "bootp.h"
  30 #include "lookup.h"
  31 #include "report.h"
  32
  33 /*
  34  * Lookup an Ethernet address and return it.
  35  * Return NULL if addr not found.
  36  */
  37 u_char *
  38 lookup_hwa(char *hostname, int htype)
  39 {
  40         switch (htype) {
  41
  42                 /* XXX - How is this done on other systems? -gwr */
  43 #ifdef  ETC_ETHERS
  44         case HTYPE_ETHERNET:
  45         case HTYPE_IEEE802:
  46                 {
  47                         static struct ether_addr ea;
  48                         /* This does a lookup in /etc/ethers */
  49                         if (ether_hostton(hostname, &ea)) {
  50                                 report(LOG_ERR, "no HW addr for host \"%s\"",
  51                                            hostname);
  52                                 return NULL;
  53                         }
  54                         return (u_char *) & ea;
  55                 }
  56 #endif /* ETC_ETHERS */
  57
  58         default:
  59                 report(LOG_ERR, "no lookup for HW addr type %d", htype);
  60         }                                                       /* switch */
  61
  62         /* If the system can't do it, just return an error. */
  63         return NULL;
  64 }
  65
  66
  67 /*
  68  * Lookup an IP address.
  69  * Return non-zero on failure.
  70  */
  71 int
  72 lookup_ipa(char *hostname, u_int32 *result)
  73 {
  74         struct hostent *hp;
  75         hp = gethostbyname(hostname);
  76         if (!hp)
  77                 return -1;
  78         bcopy(hp->h_addr, result, sizeof(*result));
  79         return 0;
  80 }
  81
  82
  83 /*
  84  * Lookup a netmask
  85  * addr and result are both in network order. Return non-zero on failure.
  86  *
  87  * XXX - This is OK as a default, but to really make this automatic,
  88  * we would need to get the subnet mask from the ether interface.
  89  * If this is wrong, specify the correct value in the bootptab.
  90  */
  91 int
  92 lookup_netmask(u_int32 addr, u_int32 *result)
  93 {
  94         int32 m, a;
  95
  96         a = ntohl(addr);
  97         m = 0;
  98
  99         if (IN_CLASSA(a))
 100                 m = IN_CLASSA_NET;
 101
 102         if (IN_CLASSB(a))
 103                 m = IN_CLASSB_NET;
 104
 105         if (IN_CLASSC(a))
 106                 m = IN_CLASSC_NET;
 107
 108         if (!m)
 109                 return -1;
 110         *result = htonl(m);
 111         return 0;
 112 }
 113
 114 /*
 115  * Local Variables:
 116  * tab-width: 4
 117  * c-indent-level: 4
 118  * c-argdecl-indent: 4
 119  * c-continued-statement-offset: 4
 120  * c-continued-brace-offset: -4
 121  * c-label-offset: -4
 122  * c-brace-offset: 0
 123  * End:
 124  */