1 /* 2 * lookup.c - Lookup IP address, HW address, netmask 3 * 4 * $Id: lookup.c,v 1.3 1996/12/10 17:05:33 wollman 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(hostname, htype) 38 char *hostname; 39 int htype; 40 { 41 switch (htype) { 42 43 /* XXX - How is this done on other systems? -gwr */ 44 #ifdef ETC_ETHERS 45 case HTYPE_ETHERNET: 46 case HTYPE_IEEE802: 47 { 48 static struct ether_addr ea; 49 /* This does a lookup in /etc/ethers */ 50 if (ether_hostton(hostname, &ea)) { 51 report(LOG_ERR, "no HW addr for host \"%s\"", 52 hostname); 53 return (u_char *) 0; 54 } 55 return (u_char *) & ea; 56 } 57 #endif /* ETC_ETHERS */ 58 59 default: 60 report(LOG_ERR, "no lookup for HW addr type %d", htype); 61 } /* switch */ 62 63 /* If the system can't do it, just return an error. */ 64 return (u_char *) 0; 65 } 66 67 68 /* 69 * Lookup an IP address. 70 * Return non-zero on failure. 71 */ 72 int 73 lookup_ipa(hostname, result) 74 char *hostname; 75 u_int32 *result; 76 { 77 struct hostent *hp; 78 hp = gethostbyname(hostname); 79 if (!hp) 80 return -1; 81 bcopy(hp->h_addr, result, sizeof(*result)); 82 return 0; 83 } 84 85 86 /* 87 * Lookup a netmask 88 * Return non-zero on failure. 89 * 90 * XXX - This is OK as a default, but to really make this automatic, 91 * we would need to get the subnet mask from the ether interface. 92 * If this is wrong, specify the correct value in the bootptab. 93 */ 94 int 95 lookup_netmask(addr, result) 96 u_int32 addr; /* both in network order */ 97 u_int32 *result; 98 { 99 int32 m, a; 100 101 a = ntohl(addr); 102 m = 0; 103 104 if (IN_CLASSA(a)) 105 m = IN_CLASSA_NET; 106 107 if (IN_CLASSB(a)) 108 m = IN_CLASSB_NET; 109 110 if (IN_CLASSC(a)) 111 m = IN_CLASSC_NET; 112 113 if (!m) 114 return -1; 115 *result = htonl(m); 116 return 0; 117 } 118 119 /* 120 * Local Variables: 121 * tab-width: 4 122 * c-indent-level: 4 123 * c-argdecl-indent: 4 124 * c-continued-statement-offset: 4 125 * c-continued-brace-offset: -4 126 * c-label-offset: -4 127 * c-brace-offset: 0 128 * End: 129 */ 130