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 06:27:07 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(hostname, htype)
  39         char *hostname;
  40         int htype;
  41 {
  42         switch (htype) {
  43
  44                 /* XXX - How is this done on other systems? -gwr */
  45 #ifdef  ETC_ETHERS
  46         case HTYPE_ETHERNET:
  47         case HTYPE_IEEE802:
  48                 {
  49                         static struct ether_addr ea;
  50                         /* This does a lookup in /etc/ethers */
  51                         if (ether_hostton(hostname, &ea)) {
  52                                 report(LOG_ERR, "no HW addr for host \"%s\"",
  53                                            hostname);
  54                                 return (u_char *) 0;
  55                         }
  56                         return (u_char *) & ea;
  57                 }
  58 #endif /* ETC_ETHERS */
  59
  60         default:
  61                 report(LOG_ERR, "no lookup for HW addr type %d", htype);
  62         }                                                       /* switch */
  63
  64         /* If the system can't do it, just return an error. */
  65         return (u_char *) 0;
  66 }
  67
  68
  69 /*
  70  * Lookup an IP address.
  71  * Return non-zero on failure.
  72  */
  73 int
  74 lookup_ipa(hostname, result)
  75         char *hostname;
  76         u_int32 *result;
  77 {
  78         struct hostent *hp;
  79         hp = gethostbyname(hostname);
  80         if (!hp)
  81                 return -1;
  82         bcopy(hp->h_addr, result, sizeof(*result));
  83         return 0;
  84 }
  85
  86
  87 /*
  88  * Lookup a netmask
  89  * Return non-zero on failure.
  90  *
  91  * XXX - This is OK as a default, but to really make this automatic,
  92  * we would need to get the subnet mask from the ether interface.
  93  * If this is wrong, specify the correct value in the bootptab.
  94  */
  95 int
  96 lookup_netmask(addr, result)
  97         u_int32 addr;                           /* both in network order */
  98         u_int32 *result;
  99 {
 100         int32 m, a;
 101
 102         a = ntohl(addr);
 103         m = 0;
 104
 105         if (IN_CLASSA(a))
 106                 m = IN_CLASSA_NET;
 107
 108         if (IN_CLASSB(a))
 109                 m = IN_CLASSB_NET;
 110
 111         if (IN_CLASSC(a))
 112                 m = IN_CLASSC_NET;
 113
 114         if (!m)
 115                 return -1;
 116         *result = htonl(m);
 117         return 0;
 118 }
 119
 120 /*
 121  * Local Variables:
 122  * tab-width: 4
 123  * c-indent-level: 4
 124  * c-argdecl-indent: 4
 125  * c-continued-statement-offset: 4
 126  * c-continued-brace-offset: -4
 127  * c-label-offset: -4
 128  * c-brace-offset: 0
 129  * End:
 130  */