lookup.c revision 18471 
1/*
2 * lookup.c - Lookup IP address, HW address, netmask
3 *
4 *	$Id$
5 */
6
7#include <sys/types.h>
8#include <sys/socket.h>
9
10#ifdef _AIX32
11#include <sys/time.h>	/* for struct timeval in net/if.h */
12#endif
13#include <net/if.h>
14#include <netinet/in.h>
15
16#ifdef	ETC_ETHERS
17#include <netinet/if_ether.h>
18extern int ether_hostton();
19#endif
20
21#include <netdb.h>
22#include <syslog.h>
23
24#ifndef USE_BFUNCS
25#include <memory.h>
26/* Yes, memcpy is OK here (no overlapped copies). */
27#define bcopy(a,b,c)    memcpy(b,a,c)
28#endif
29
30#include "bootp.h"
31#include "lookup.h"
32#include "report.h"
33
34/*
35 * Lookup an Ethernet address and return it.
36 * Return NULL if addr not found.
37 */
38u_char *
39lookup_hwa(hostname, htype)
40	char *hostname;
41	int htype;
42{
43	switch (htype) {
44
45		/* XXX - How is this done on other systems? -gwr */
46#ifdef	ETC_ETHERS
47	case HTYPE_ETHERNET:
48	case HTYPE_IEEE802:
49		{
50			static struct ether_addr ea;
51			/* This does a lookup in /etc/ethers */
52			if (ether_hostton(hostname, &ea)) {
53				report(LOG_ERR, "no HW addr for host \"%s\"",
54					   hostname);
55				return (u_char *) 0;
56			}
57			return (u_char *) & ea;
58		}
59#endif /* ETC_ETHERS */
60
61	default:
62		report(LOG_ERR, "no lookup for HW addr type %d", htype);
63	}							/* switch */
64
65	/* If the system can't do it, just return an error. */
66	return (u_char *) 0;
67}
68
69
70/*
71 * Lookup an IP address.
72 * Return non-zero on failure.
73 */
74int
75lookup_ipa(hostname, result)
76	char *hostname;
77	u_int32 *result;
78{
79	struct hostent *hp;
80	hp = gethostbyname(hostname);
81	if (!hp)
82		return -1;
83	bcopy(hp->h_addr, result, sizeof(*result));
84	return 0;
85}
86
87
88/*
89 * Lookup a netmask
90 * Return non-zero on failure.
91 *
92 * XXX - This is OK as a default, but to really make this automatic,
93 * we would need to get the subnet mask from the ether interface.
94 * If this is wrong, specify the correct value in the bootptab.
95 */
96int
97lookup_netmask(addr, result)
98	u_int32 addr;				/* both in network order */
99	u_int32 *result;
100{
101	int32 m, a;
102
103	a = ntohl(addr);
104	m = 0;
105
106	if (IN_CLASSA(a))
107		m = IN_CLASSA_NET;
108
109	if (IN_CLASSB(a))
110		m = IN_CLASSB_NET;
111
112	if (IN_CLASSC(a))
113		m = IN_CLASSC_NET;
114
115	if (!m)
116		return -1;
117	*result = htonl(m);
118	return 0;
119}
120
121/*
122 * Local Variables:
123 * tab-width: 4
124 * c-indent-level: 4
125 * c-argdecl-indent: 4
126 * c-continued-statement-offset: 4
127 * c-continued-brace-offset: -4
128 * c-label-offset: -4
129 * c-brace-offset: 0
130 * End:
131 */
132